Revision 1b73913e7ada92bb23207768b3d918a575293272 authored by B. W. Lewis on 22 February 2015, 00:20:24 UTC, committed by B. W. Lewis on 22 February 2015, 00:20:24 UTC
1 parent 6506844
mongoose.c
// Copyright (c) 2004-2013 Sergey Lyubka <valenok@gmail.com>
// Copyright (c) 2013 Cesanta Software Limited
// All rights reserved
//
// This library is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see <http://www.gnu.org/licenses/>.
//
// You are free to use this library under the terms of the GNU General
// Public License, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// Alternatively, you can license this library under a commercial
// license, as set out in <http://cesanta.com/products.html>.
#if defined(_WIN32)
#if !defined(_CRT_SECURE_NO_WARNINGS)
#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
#endif
#else
#ifdef __linux__
#define _XOPEN_SOURCE 600 // For flockfile() on Linux
#endif
#if !defined(_LARGEFILE_SOURCE)
#define _LARGEFILE_SOURCE // Enable 64-bit file offsets
#endif
#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
#define __STDC_LIMIT_MACROS // C++ wants that for INT64_MAX
#endif
#if defined (_MSC_VER)
// conditional expression is constant: introduced by FD_SET(..)
#pragma warning (disable : 4127)
// non-constant aggregate initializer: issued due to missing C99 support
#pragma warning (disable : 4204)
#endif
// Disable WIN32_LEAN_AND_MEAN.
// This makes windows.h always include winsock2.h
#ifdef WIN32_LEAN_AND_MEAN
#undef WIN32_LEAN_AND_MEAN
#endif
#if defined(__SYMBIAN32__)
#define NO_SSL // SSL is not supported
#define NO_CGI // CGI is not supported
#define PATH_MAX FILENAME_MAX
#endif // __SYMBIAN32__
#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#endif // !_WIN32_WCE
#include <time.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <syslog.h>
#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
#undef _WIN32_WINNT
#define _WIN32_WINNT 0x0400 // To make it link in VS2005
#include <windows.h>
#ifndef PATH_MAX
#define PATH_MAX MAX_PATH
#endif
#ifndef _WIN32_WCE
#include <process.h>
#include <direct.h>
#include <io.h>
#else // _WIN32_WCE
#define NO_CGI // WinCE has no pipes
typedef long off_t;
#define errno GetLastError()
#define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
#endif // _WIN32_WCE
#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
((uint64_t)((uint32_t)(hi))) << 32))
#define RATE_DIFF 10000000 // 100 nsecs
#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
#define SYS2UNIX_TIME(lo, hi) \
(time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
// Visual Studio 6 does not know __func__ or __FUNCTION__
// The rest of MS compilers use __FUNCTION__, not C99 __func__
// Also use _strtoui64 on modern M$ compilers
#if defined(_MSC_VER) && _MSC_VER < 1300
#define STRX(x) #x
#define STR(x) STRX(x)
#define __func__ __FILE__ ":" STR(__LINE__)
#define strtoull(x, y, z) (unsigned __int64) _atoi64(x)
#define strtoll(x, y, z) _atoi64(x)
#else
#define __func__ __FUNCTION__
#define strtoull(x, y, z) _strtoui64(x, y, z)
#define strtoll(x, y, z) _strtoi64(x, y, z)
#endif // _MSC_VER
#define ERRNO GetLastError()
#define NO_SOCKLEN_T
#define SSL_LIB "ssleay32.dll"
#define CRYPTO_LIB "libeay32.dll"
#define O_NONBLOCK 0
#if !defined(EWOULDBLOCK)
#define EWOULDBLOCK WSAEWOULDBLOCK
#endif // !EWOULDBLOCK
#define _POSIX_
#define INT64_FMT "I64d"
#define WINCDECL __cdecl
#define SHUT_WR 1
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define mg_sleep(x) Sleep(x)
#define pipe(x) _pipe(x, MG_BUF_LEN, _O_BINARY)
#ifndef popen
#define popen(x, y) _popen(x, y)
#endif
#ifndef pclose
#define pclose(x) _pclose(x)
#endif
#define close(x) _close(x)
#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
#define RTLD_LAZY 0
#define fseeko(x, y, z) _lseeki64(_fileno(x), (y), (z))
#define fdopen(x, y) _fdopen((x), (y))
#define write(x, y, z) _write((x), (y), (unsigned) z)
#define read(x, y, z) _read((x), (y), (unsigned) z)
#define flockfile(x)
#define funlockfile(x)
#define sleep(x) Sleep((x) * 1000)
#define rmdir(x) _rmdir(x)
#if !defined(va_copy)
#define va_copy(x, y) x = y
#endif // !va_copy MINGW #defines va_copy
#if !defined(fileno)
#define fileno(x) _fileno(x)
#endif // !fileno MINGW #defines fileno
typedef HANDLE pthread_mutex_t;
typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
typedef DWORD pthread_t;
#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
static int pthread_mutex_lock(pthread_mutex_t *);
static int pthread_mutex_unlock(pthread_mutex_t *);
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len);
struct file;
static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p);
#if defined(HAVE_STDINT)
#include <stdint.h>
#else
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
#define INT64_MAX 9223372036854775807
#endif // HAVE_STDINT
// POSIX dirent interface
struct dirent {
char d_name[PATH_MAX];
};
typedef struct DIR {
HANDLE handle;
WIN32_FIND_DATAW info;
struct dirent result;
} DIR;
#ifndef HAVE_POLL
struct pollfd {
SOCKET fd;
short events;
short revents;
};
#define POLLIN 1
#endif
// Mark required libraries
#ifdef _MSC_VER
#pragma comment(lib, "Ws2_32.lib")
#endif
#else // UNIX specific
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <netdb.h>
#include <zlib.h>
#define windowBits 15
#define GZIP_ENCODING 16
#include <pwd.h>
#include <unistd.h>
#include <dirent.h>
#if !defined(NO_SSL_DL) && !defined(NO_SSL)
#include <dlfcn.h>
#endif
#include <pthread.h>
#if defined(__MACH__)
#define SSL_LIB "libssl.dylib"
#define CRYPTO_LIB "libcrypto.dylib"
#else
#if !defined(SSL_LIB)
#define SSL_LIB "libssl.so"
#endif
#if !defined(CRYPTO_LIB)
#define CRYPTO_LIB "libcrypto.so"
#endif
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif // O_BINARY
#define closesocket(a) close(a)
#define mg_mkdir(x, y) mkdir(x, y)
#define mg_remove(x) remove(x)
#define mg_sleep(x) usleep((x) * 1000)
#define ERRNO errno
#define INVALID_SOCKET (-1)
#define INT64_FMT PRId64
typedef int SOCKET;
#define WINCDECL
#endif // End of Windows and UNIX specific includes
#include "mongoose.h"
#define MONGOOSE_VERSION "4.2"
#define PASSWORDS_FILE_NAME ".htpasswd"
#define CGI_ENVIRONMENT_SIZE 4096
#define MAX_CGI_ENVIR_VARS 64
#define MG_BUF_LEN 8192
#define MAX_REQUEST_SIZE 262144
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#ifdef _WIN32
static pthread_t pthread_self(void) {
return GetCurrentThreadId();
}
#endif // _WIN32
#ifdef DEBUG_TRACE
#undef DEBUG_TRACE
#define DEBUG_TRACE(x)
#else
#if defined(DEBUG)
#define DEBUG_TRACE(x) do { \
flockfile(stdout); \
printf("*** %lu.%p.%s.%d: ", \
(unsigned long) time(NULL), (void *) pthread_self(), \
__func__, __LINE__); \
printf x; \
putchar('\n'); \
fflush(stdout); \
funlockfile(stdout); \
} while (0)
#else
#define DEBUG_TRACE(x)
#endif // DEBUG
#endif // DEBUG_TRACE
// Darwin prior to 7.0 and Win32 do not have socklen_t
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif // NO_SOCKLEN_T
#define _DARWIN_UNLIMITED_SELECT
#define IP_ADDR_STR_LEN 50 // IPv6 hex string is 46 chars
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
#if !defined(SOMAXCONN)
#define SOMAXCONN 100
#endif
#if !defined(PATH_MAX)
#define PATH_MAX 4096
#endif
// Size of the accepted socket queue
#if !defined(MGSQLEN)
#define MGSQLEN 20
#endif
// Extra HTTP headers to send in every static file reply
#if !defined(EXTRA_HTTP_HEADERS)
#define EXTRA_HTTP_HEADERS ""
#endif
static const char *http_500_error = "Internal Server Error";
#if defined(NO_SSL_DL)
#include <openssl/ssl.h>
#include <openssl/err.h>
#else
// SSL loaded dynamically from DLL.
// I put the prototypes here to be independent from OpenSSL source installation.
typedef struct ssl_st SSL;
typedef struct ssl_method_st SSL_METHOD;
typedef struct ssl_ctx_st SSL_CTX;
struct ssl_func {
const char *name; // SSL function name
void (*ptr)(void); // Function pointer
};
#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[11].ptr)
#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
const char *, int)) ssl_sw[12].ptr)
#define SSL_CTX_set_default_passwd_cb \
(* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
#define SSL_CTX_use_certificate_chain_file \
(* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
#define SSLv23_client_method (* (SSL_METHOD * (*)(void)) ssl_sw[17].ptr)
#define SSL_pending (* (int (*)(SSL *)) ssl_sw[18].ptr)
#define SSL_CTX_set_verify (* (void (*)(SSL_CTX *, int, int)) ssl_sw[19].ptr)
#define SSL_shutdown (* (int (*)(SSL *)) ssl_sw[20].ptr)
#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
#define CRYPTO_set_locking_callback \
(* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
#define CRYPTO_set_id_callback \
(* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
// set_ssl_option() function updates this array.
// It loads SSL library dynamically and changes NULLs to the actual addresses
// of respective functions. The macros above (like SSL_connect()) are really
// just calling these functions indirectly via the pointer.
static struct ssl_func ssl_sw[] = {
{"SSL_free", NULL},
{"SSL_accept", NULL},
{"SSL_connect", NULL},
{"SSL_read", NULL},
{"SSL_write", NULL},
{"SSL_get_error", NULL},
{"SSL_set_fd", NULL},
{"SSL_new", NULL},
{"SSL_CTX_new", NULL},
{"SSLv23_server_method", NULL},
{"SSL_library_init", NULL},
{"SSL_CTX_use_PrivateKey_file", NULL},
{"SSL_CTX_use_certificate_file",NULL},
{"SSL_CTX_set_default_passwd_cb",NULL},
{"SSL_CTX_free", NULL},
{"SSL_load_error_strings", NULL},
{"SSL_CTX_use_certificate_chain_file", NULL},
{"SSLv23_client_method", NULL},
{"SSL_pending", NULL},
{"SSL_CTX_set_verify", NULL},
{"SSL_shutdown", NULL},
{NULL, NULL}
};
// Similar array as ssl_sw. These functions could be located in different lib.
#if !defined(NO_SSL)
static struct ssl_func crypto_sw[] = {
{"CRYPTO_num_locks", NULL},
{"CRYPTO_set_locking_callback", NULL},
{"CRYPTO_set_id_callback", NULL},
{"ERR_get_error", NULL},
{"ERR_error_string", NULL},
{NULL, NULL}
};
#endif // NO_SSL
#endif // NO_SSL_DL
static const char *month_names[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
// Unified socket address. For IPv6 support, add IPv6 address structure
// in the union u.
union usa {
struct sockaddr sa;
struct sockaddr_in sin;
#if defined(USE_IPV6)
struct sockaddr_in6 sin6;
#endif
};
// Describes a string (chunk of memory).
struct vec {
const char *ptr;
size_t len;
};
struct file {
int is_directory;
time_t modification_time;
int64_t size;
FILE *fp;
const char *membuf; // Non-NULL if file data is in memory
// set to 1 if the content is gzipped
// in which case we need a content-encoding: gzip header
int gzipped;
};
#define STRUCT_FILE_INITIALIZER {0, 0, 0, NULL, NULL, 0}
// Describes listening socket, or socket which was accept()-ed by the master
// thread and queued for future handling by the worker thread.
struct socket {
SOCKET sock; // Listening socket
union usa lsa; // Local socket address
union usa rsa; // Remote socket address
unsigned is_ssl:1; // Is port SSL-ed
unsigned ssl_redir:1; // Is port supposed to redirect everything to SSL port
};
// NOTE(lsm): this enum shoulds be in sync with the config_options below.
enum {
CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, THROTTLE,
ACCESS_LOG_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
GLOBAL_PASSWORDS_FILE, INDEX_FILES, ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST,
EXTRA_MIME_TYPES, LISTENING_PORTS, DOCUMENT_ROOT, SSL_CERTIFICATE,
NUM_THREADS, RUN_AS_USER, REWRITE, HIDE_FILES, REQUEST_TIMEOUT,
NUM_OPTIONS
};
static const char *config_options[] = {
"cgi_pattern", "**.cgi$|**.pl$|**.php$",
"cgi_environment", NULL,
"put_delete_auth_file", NULL,
"cgi_interpreter", NULL,
"protect_uri", NULL,
"authentication_domain", "",
"ssi_pattern", "**.shtml$|**.shtm$",
"throttle", NULL,
"access_log_file", NULL,
"enable_directory_listing", "yes",
"error_log_file", NULL,
"global_auth_file", NULL,
"index_files",
"index.html,index.htm,index.cgi,index.shtml,index.php,index.lp",
"enable_keep_alive", "no",
"access_control_list", NULL,
"extra_mime_types", NULL,
"listening_ports", "8080",
"document_root", NULL,
"ssl_certificate", NULL,
"num_threads", "50",
"run_as_user", NULL,
"url_rewrite_patterns", NULL,
"hide_files_patterns", NULL,
"request_timeout_ms", "30000",
NULL
};
struct mg_context {
volatile int stop_flag; // Should we stop event loop
SSL_CTX *ssl_ctx; // SSL context
char *config[NUM_OPTIONS]; // Mongoose configuration parameters
struct mg_callbacks callbacks; // User-defined callback function
void *user_data; // User-defined data
struct socket *listening_sockets;
int num_listening_sockets;
volatile int num_threads; // Number of threads
pthread_mutex_t mutex; // Protects (max|num)_threads
pthread_cond_t cond; // Condvar for tracking workers terminations
struct socket queue[MGSQLEN]; // Accepted sockets
volatile int sq_head; // Head of the socket queue
volatile int sq_tail; // Tail of the socket queue
pthread_cond_t sq_full; // Signaled when socket is produced
pthread_cond_t sq_empty; // Signaled when socket is consumed
};
struct mg_connection {
struct mg_request_info request_info;
struct mg_context *ctx;
SSL *ssl; // SSL descriptor
SSL_CTX *client_ssl_ctx; // SSL context for client connections
struct socket client; // Connected client
time_t birth_time; // Time when request was received
int64_t num_bytes_sent; // Total bytes sent to client
int64_t content_len; // Content-Length header value
int64_t consumed_content; // How many bytes of content have been read
char *buf; // Buffer for received data
char *path_info; // PATH_INFO part of the URL
int must_close; // 1 if connection must be closed
int buf_size; // Buffer size
int request_len; // Size of the request + headers in a buffer
int data_len; // Total size of data in a buffer
int status_code; // HTTP reply status code, e.g. 200
int throttle; // Throttling, bytes/sec. <= 0 means no throttle
time_t last_throttle_time; // Last time throttled data was sent
int64_t last_throttle_bytes;// Bytes sent this second
int auth; // 1 if basic digest auth is ok
};
int
mg_get_basic_auth(struct mg_connection *conn)
{
return conn->auth;
}
// Directory entry
struct de {
struct mg_connection *conn;
char *file_name;
struct file file;
};
const char **mg_get_valid_option_names(void) {
return config_options;
}
static int is_file_in_memory(struct mg_connection *conn, const char *path,
struct file *filep) {
size_t size = 0;
if ((filep->membuf = conn->ctx->callbacks.open_file == NULL ? NULL :
conn->ctx->callbacks.open_file(conn, path, &size)) != NULL) {
// NOTE: override filep->size only on success. Otherwise, it might break
// constructs like if (!mg_stat() || !mg_fopen()) ...
filep->size = size;
}
return filep->membuf != NULL;
}
static int is_file_opened(const struct file *filep) {
return filep->membuf != NULL || filep->fp != NULL;
}
static int mg_fopen(struct mg_connection *conn, const char *path,
const char *mode, struct file *filep) {
if (!is_file_in_memory(conn, path, filep)) {
#ifdef _WIN32
wchar_t wbuf[PATH_MAX], wmode[20];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
filep->fp = _wfopen(wbuf, wmode);
#else
filep->fp = fopen(path, mode);
#endif
}
return is_file_opened(filep);
}
static void mg_fclose(struct file *filep) {
if (filep != NULL && filep->fp != NULL) {
fclose(filep->fp);
}
}
static int get_option_index(const char *name) {
int i;
for (i = 0; config_options[i * 2] != NULL; i++) {
if (strcmp(config_options[i * 2], name) == 0) {
return i;
}
}
return -1;
}
const char *mg_get_option(const struct mg_context *ctx, const char *name) {
int i;
if ((i = get_option_index(name)) == -1) {
return NULL;
} else if (ctx->config[i] == NULL) {
return "";
} else {
return ctx->config[i];
}
}
static void sockaddr_to_string(char *buf, size_t len,
const union usa *usa) {
buf[0] = '\0';
#if defined(USE_IPV6)
inet_ntop(usa->sa.sa_family, usa->sa.sa_family == AF_INET ?
(void *) &usa->sin.sin_addr :
(void *) &usa->sin6.sin6_addr, buf, len);
#elif defined(_WIN32)
// Only Windoze Vista (and newer) have inet_ntop()
strncpy(buf, inet_ntoa(usa->sin.sin_addr), len);
#else
inet_ntop(usa->sa.sa_family, (void *) &usa->sin.sin_addr, buf, len);
#endif
}
static void cry(struct mg_connection *conn,
PRINTF_FORMAT_STRING(const char *fmt), ...) PRINTF_ARGS(2, 3);
// Print error message to the opened error log stream.
static void cry(struct mg_connection *conn, const char *fmt, ...) {
char buf[MG_BUF_LEN], src_addr[IP_ADDR_STR_LEN];
va_list ap;
FILE *fp;
time_t timestamp;
va_start(ap, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
// Do not lock when getting the callback value, here and below.
// I suppose this is fine, since function cannot disappear in the
// same way string option can.
if (conn->ctx->callbacks.log_message == NULL ||
conn->ctx->callbacks.log_message(conn, buf) == 0) {
fp = conn->ctx == NULL || conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
if (fp != NULL) {
flockfile(fp);
timestamp = time(NULL);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "[%010lu] [error] [client %s] ", (unsigned long) timestamp,
src_addr);
if (conn->request_info.request_method != NULL) {
fprintf(fp, "%s %s: ", conn->request_info.request_method,
conn->request_info.uri);
}
fprintf(fp, "%s", buf);
fputc('\n', fp);
funlockfile(fp);
fclose(fp);
}
}
}
// Return fake connection structure. Used for logging, if connection
// is not applicable at the moment of logging.
static struct mg_connection *fc(struct mg_context *ctx) {
static struct mg_connection fake_connection;
fake_connection.ctx = ctx;
return &fake_connection;
}
const char *mg_version(void) {
return MONGOOSE_VERSION;
}
struct mg_request_info *mg_get_request_info(struct mg_connection *conn) {
return &conn->request_info;
}
static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
for (; *src != '\0' && n > 1; n--) {
*dst++ = *src++;
}
*dst = '\0';
}
static int lowercase(const char *s) {
return tolower(* (const unsigned char *) s);
}
static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
int diff = 0;
if (len > 0)
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0' && --len > 0);
return diff;
}
static int mg_strcasecmp(const char *s1, const char *s2) {
int diff;
do {
diff = lowercase(s1++) - lowercase(s2++);
} while (diff == 0 && s1[-1] != '\0');
return diff;
}
static char * mg_strndup(const char *ptr, size_t len) {
char *p;
if ((p = (char *) malloc(len + 1)) != NULL) {
mg_strlcpy(p, ptr, len + 1);
}
return p;
}
static char * mg_strdup(const char *str) {
return mg_strndup(str, strlen(str));
}
static const char *mg_strcasestr(const char *big_str, const char *small_str) {
int i, big_len = strlen(big_str), small_len = strlen(small_str);
for (i = 0; i <= big_len - small_len; i++) {
if (mg_strncasecmp(big_str + i, small_str, small_len) == 0) {
return big_str + i;
}
}
return NULL;
}
// Like snprintf(), but never returns negative value, or a value
// that is larger than a supplied buffer.
// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
// in his audit report.
static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
const char *fmt, va_list ap) {
int n;
if (buflen == 0)
return 0;
n = vsnprintf(buf, buflen, fmt, ap);
if (n < 0) {
cry(conn, "vsnprintf error");
n = 0;
} else if (n >= (int) buflen) {
cry(conn, "truncating vsnprintf buffer: [%.*s]",
n > 200 ? 200 : n, buf);
n = (int) buflen - 1;
}
buf[n] = '\0';
return n;
}
static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(4, 5);
static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
const char *fmt, ...) {
va_list ap;
int n;
va_start(ap, fmt);
n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
va_end(ap);
return n;
}
// Skip the characters until one of the delimiters characters found.
// 0-terminate resulting word. Skip the delimiter and following whitespaces.
// Advance pointer to buffer to the next word. Return found 0-terminated word.
// Delimiters can be quoted with quotechar.
static char *skip_quoted(char **buf, const char *delimiters,
const char *whitespace, char quotechar) {
char *p, *begin_word, *end_word, *end_whitespace;
begin_word = *buf;
end_word = begin_word + strcspn(begin_word, delimiters);
// Check for quotechar
if (end_word > begin_word) {
p = end_word - 1;
while (*p == quotechar) {
// If there is anything beyond end_word, copy it
if (*end_word == '\0') {
*p = '\0';
break;
} else {
size_t end_off = strcspn(end_word + 1, delimiters);
memmove (p, end_word, end_off + 1);
p += end_off; // p must correspond to end_word - 1
end_word += end_off + 1;
}
}
for (p++; p < end_word; p++) {
*p = '\0';
}
}
if (*end_word == '\0') {
*buf = end_word;
} else {
end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
for (p = end_word; p < end_whitespace; p++) {
*p = '\0';
}
*buf = end_whitespace;
}
return begin_word;
}
// Simplified version of skip_quoted without quote char
// and whitespace == delimiters
static char *skip(char **buf, const char *delimiters) {
return skip_quoted(buf, delimiters, delimiters, 0);
}
// Return HTTP header value, or NULL if not found.
static const char *get_header(const struct mg_request_info *ri,
const char *name) {
int i;
for (i = 0; i < ri->num_headers; i++)
if (!mg_strcasecmp(name, ri->http_headers[i].name))
return ri->http_headers[i].value;
return NULL;
}
const char *mg_get_header(const struct mg_connection *conn, const char *name) {
return get_header(&conn->request_info, name);
}
// A helper function for traversing a comma separated list of values.
// It returns a list pointer shifted to the next value, or NULL if the end
// of the list found.
// Value is stored in val vector. If value has form "x=y", then eq_val
// vector is initialized to point to the "y" part, and val vector length
// is adjusted to point only to "x".
static const char *next_option(const char *list, struct vec *val,
struct vec *eq_val) {
if (list == NULL || *list == '\0') {
// End of the list
list = NULL;
} else {
val->ptr = list;
if ((list = strchr(val->ptr, ',')) != NULL) {
// Comma found. Store length and shift the list ptr
val->len = list - val->ptr;
list++;
} else {
// This value is the last one
list = val->ptr + strlen(val->ptr);
val->len = list - val->ptr;
}
if (eq_val != NULL) {
// Value has form "x=y", adjust pointers and lengths
// so that val points to "x", and eq_val points to "y".
eq_val->len = 0;
eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
if (eq_val->ptr != NULL) {
eq_val->ptr++; // Skip over '=' character
eq_val->len = val->ptr + val->len - eq_val->ptr;
val->len = (eq_val->ptr - val->ptr) - 1;
}
}
}
return list;
}
// Perform case-insensitive match of string against pattern
static int match_prefix(const char *pattern, int pattern_len, const char *str) {
const char *or_str;
int i, j, len, res;
if ((or_str = (const char *) memchr(pattern, '|', pattern_len)) != NULL) {
res = match_prefix(pattern, or_str - pattern, str);
return res > 0 ? res :
match_prefix(or_str + 1, (pattern + pattern_len) - (or_str + 1), str);
}
i = j = 0;
res = -1;
for (; i < pattern_len; i++, j++) {
if (pattern[i] == '?' && str[j] != '\0') {
continue;
} else if (pattern[i] == '$') {
return str[j] == '\0' ? j : -1;
} else if (pattern[i] == '*') {
i++;
if (pattern[i] == '*') {
i++;
len = (int) strlen(str + j);
} else {
len = (int) strcspn(str + j, "/");
}
if (i == pattern_len) {
return j + len;
}
do {
res = match_prefix(pattern + i, pattern_len - i, str + j + len);
} while (res == -1 && len-- > 0);
return res == -1 ? -1 : j + res + len;
} else if (lowercase(&pattern[i]) != lowercase(&str[j])) {
return -1;
}
}
return j;
}
// HTTP 1.1 assumes keep alive if "Connection:" header is not set
// This function must tolerate situations when connection info is not
// set up, for example if request parsing failed.
static int should_keep_alive(const struct mg_connection *conn) {
const char *http_version = conn->request_info.http_version;
const char *header = mg_get_header(conn, "Connection");
if (conn->must_close ||
conn->status_code == 401 ||
mg_strcasecmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes") != 0 ||
(header != NULL && mg_strcasecmp(header, "keep-alive") != 0) ||
(header == NULL && http_version && strcmp(http_version, "1.1"))) {
return 0;
}
return 1;
}
static const char *suggest_connection_header(const struct mg_connection *conn) {
return should_keep_alive(conn) ? "keep-alive" : "close";
}
static void send_http_error(struct mg_connection *, int, const char *,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(4, 5);
static void send_http_error(struct mg_connection *conn, int status,
const char *reason, const char *fmt, ...) {
char buf[MG_BUF_LEN];
va_list ap;
int len = 0;
conn->status_code = status;
buf[0] = '\0';
// Errors 1xx, 204 and 304 MUST NOT send a body
if (status > 199 && status != 204 && status != 304) {
len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
buf[len++] = '\n';
va_start(ap, fmt);
len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
va_end(ap);
}
DEBUG_TRACE(("[%s]", buf));
mg_printf(conn, "HTTP/1.1 %d %s\r\n"
"Content-Length: %d\r\n"
"Connection: %s\r\n\r\n", status, reason, len,
suggest_connection_header(conn));
conn->num_bytes_sent += mg_printf(conn, "%s", buf);
}
#if defined(_WIN32) && !defined(__SYMBIAN32__)
static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
(void) unused;
*mutex = CreateMutex(NULL, FALSE, NULL);
return *mutex == NULL ? -1 : 0;
}
static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
return CloseHandle(*mutex) == 0 ? -1 : 0;
}
static int pthread_mutex_lock(pthread_mutex_t *mutex) {
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
return ReleaseMutex(*mutex) == 0 ? -1 : 0;
}
static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
(void) unused;
cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
}
static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
HANDLE handles[] = {cv->signal, cv->broadcast};
ReleaseMutex(*mutex);
WaitForMultipleObjects(2, handles, FALSE, INFINITE);
return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
}
static int pthread_cond_signal(pthread_cond_t *cv) {
return SetEvent(cv->signal) == 0 ? -1 : 0;
}
static int pthread_cond_broadcast(pthread_cond_t *cv) {
// Implementation with PulseEvent() has race condition, see
// http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
}
static int pthread_cond_destroy(pthread_cond_t *cv) {
return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
}
// For Windows, change all slashes to backslashes in path names.
static void change_slashes_to_backslashes(char *path) {
int i;
for (i = 0; path[i] != '\0'; i++) {
if (path[i] == '/')
path[i] = '\\';
// i > 0 check is to preserve UNC paths, like \\server\file.txt
if (path[i] == '\\' && i > 0)
while (path[i + 1] == '\\' || path[i + 1] == '/')
(void) memmove(path + i + 1,
path + i + 2, strlen(path + i + 1));
}
}
// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
// wbuf and wbuf_len is a target buffer and its length.
static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
char buf[PATH_MAX * 2], buf2[PATH_MAX * 2];
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
// Convert to Unicode and back. If doubly-converted string does not
// match the original, something is fishy, reject.
memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
NULL, NULL);
if (strcmp(buf, buf2) != 0) {
wbuf[0] = L'\0';
}
}
#if defined(_WIN32_WCE)
static time_t time(time_t *ptime) {
time_t t;
SYSTEMTIME st;
FILETIME ft;
GetSystemTime(&st);
SystemTimeToFileTime(&st, &ft);
t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
if (ptime != NULL) {
*ptime = t;
}
return t;
}
static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
FILETIME ft, lft;
SYSTEMTIME st;
TIME_ZONE_INFORMATION tzinfo;
if (ptm == NULL) {
return NULL;
}
* (int64_t *) &ft = t;
FileTimeToLocalFileTime(&ft, &lft);
FileTimeToSystemTime(&lft, &st);
ptm->tm_year = st.wYear - 1900;
ptm->tm_mon = st.wMonth - 1;
ptm->tm_wday = st.wDayOfWeek;
ptm->tm_mday = st.wDay;
ptm->tm_hour = st.wHour;
ptm->tm_min = st.wMinute;
ptm->tm_sec = st.wSecond;
ptm->tm_yday = 0; // hope nobody uses this
ptm->tm_isdst =
GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
return ptm;
}
static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
// FIXME(lsm): fix this.
return localtime(ptime, ptm);
}
static size_t strftime(char *dst, size_t dst_size, const char *fmt,
const struct tm *tm) {
(void) snprintf(dst, dst_size, "implement strftime() for WinCE");
return 0;
}
#endif
// Windows happily opens files with some garbage at the end of file name.
// For example, fopen("a.cgi ", "r") on Windows successfully opens
// "a.cgi", despite one would expect an error back.
// This function returns non-0 if path ends with some garbage.
static int path_cannot_disclose_cgi(const char *path) {
static const char *allowed_last_characters = "_-";
int last = path[strlen(path) - 1];
return isalnum(last) || strchr(allowed_last_characters, last) != NULL;
}
static int mg_stat(struct mg_connection *conn, const char *path,
struct file *filep) {
wchar_t wbuf[PATH_MAX] = L"\\\\?\\";
WIN32_FILE_ATTRIBUTE_DATA info;
if (!is_file_in_memory(conn, path, filep)) {
to_unicode(path, wbuf + 4, ARRAY_SIZE(wbuf) - 4);
if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
filep->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
filep->modification_time = SYS2UNIX_TIME(
info.ftLastWriteTime.dwLowDateTime,
info.ftLastWriteTime.dwHighDateTime);
filep->is_directory = info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
// If file name is fishy, reset the file structure and return error.
// Note it is important to reset, not just return the error, cause
// functions like is_file_opened() check the struct.
if (!filep->is_directory && !path_cannot_disclose_cgi(path)) {
memset(filep, 0, sizeof(*filep));
}
}
}
return filep->membuf != NULL || filep->modification_time != 0;
}
static int mg_remove(const char *path) {
wchar_t wbuf[PATH_MAX];
to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
return DeleteFileW(wbuf) ? 0 : -1;
}
static int mg_mkdir(const char *path, int mode) {
char buf[PATH_MAX];
wchar_t wbuf[PATH_MAX];
(void) mode;
mg_strlcpy(buf, path, sizeof(buf));
change_slashes_to_backslashes(buf);
(void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, ARRAY_SIZE(wbuf));
return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
}
// Implementation of POSIX opendir/closedir/readdir for Windows.
static DIR * opendir(const char *name) {
DIR *dir = NULL;
wchar_t wpath[PATH_MAX];
DWORD attrs;
if (name == NULL) {
SetLastError(ERROR_BAD_ARGUMENTS);
} else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
} else {
to_unicode(name, wpath, ARRAY_SIZE(wpath));
attrs = GetFileAttributesW(wpath);
if (attrs != 0xFFFFFFFF &&
((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
(void) wcscat(wpath, L"\\*");
dir->handle = FindFirstFileW(wpath, &dir->info);
dir->result.d_name[0] = '\0';
} else {
free(dir);
dir = NULL;
}
}
return dir;
}
static int closedir(DIR *dir) {
int result = 0;
if (dir != NULL) {
if (dir->handle != INVALID_HANDLE_VALUE)
result = FindClose(dir->handle) ? 0 : -1;
free(dir);
} else {
result = -1;
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
static struct dirent *readdir(DIR *dir) {
struct dirent *result = 0;
if (dir) {
if (dir->handle != INVALID_HANDLE_VALUE) {
result = &dir->result;
(void) WideCharToMultiByte(CP_UTF8, 0,
dir->info.cFileName, -1, result->d_name,
sizeof(result->d_name), NULL, NULL);
if (!FindNextFileW(dir->handle, &dir->info)) {
(void) FindClose(dir->handle);
dir->handle = INVALID_HANDLE_VALUE;
}
} else {
SetLastError(ERROR_FILE_NOT_FOUND);
}
} else {
SetLastError(ERROR_BAD_ARGUMENTS);
}
return result;
}
#ifndef HAVE_POLL
static int poll(struct pollfd *pfd, int n, int milliseconds) {
struct timeval tv;
fd_set set;
int i, result;
SOCKET maxfd = 0;
tv.tv_sec = milliseconds / 1000;
tv.tv_usec = (milliseconds % 1000) * 1000;
FD_ZERO(&set);
for (i = 0; i < n; i++) {
FD_SET((SOCKET) pfd[i].fd, &set);
pfd[i].revents = 0;
if (pfd[i].fd > maxfd) {
maxfd = pfd[i].fd;
}
}
if ((result = select(maxfd + 1, &set, NULL, NULL, &tv)) > 0) {
for (i = 0; i < n; i++) {
if (FD_ISSET(pfd[i].fd, &set)) {
pfd[i].revents = POLLIN;
}
}
}
return result;
}
#endif // HAVE_POLL
static void set_close_on_exec(SOCKET sock) {
(void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0);
}
int mg_start_thread(mg_thread_func_t f, void *p) {
return (long)_beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
}
static HANDLE dlopen(const char *dll_name, int flags) {
wchar_t wbuf[PATH_MAX];
(void) flags;
to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
return LoadLibraryW(wbuf);
}
#if !defined(NO_CGI)
#define SIGKILL 0
static int kill(pid_t pid, int sig_num) {
(void) TerminateProcess(pid, sig_num);
(void) CloseHandle(pid);
return 0;
}
static void trim_trailing_whitespaces(char *s) {
char *e = s + strlen(s) - 1;
while (e > s && isspace(* (unsigned char *) e)) {
*e-- = '\0';
}
}
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
char *envblk, char *envp[], int fdin,
int fdout, const char *dir) {
HANDLE me;
char *p, *interp, full_interp[PATH_MAX], full_dir[PATH_MAX],
cmdline[PATH_MAX], buf[PATH_MAX];
struct file file = STRUCT_FILE_INITIALIZER;
STARTUPINFOA si;
PROCESS_INFORMATION pi = { 0 };
(void) envp;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
// TODO(lsm): redirect CGI errors to the error log file
si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
me = GetCurrentProcess();
DuplicateHandle(me, (HANDLE) _get_osfhandle(fdin), me,
&si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
DuplicateHandle(me, (HANDLE) _get_osfhandle(fdout), me,
&si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
// If CGI file is a script, try to read the interpreter line
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
buf[0] = buf[1] = '\0';
// Read the first line of the script into the buffer
snprintf(cmdline, sizeof(cmdline), "%s%c%s", dir, '/', prog);
if (mg_fopen(conn, cmdline, "r", &file)) {
p = (char *) file.membuf;
mg_fgets(buf, sizeof(buf), &file, &p);
mg_fclose(&file);
buf[sizeof(buf) - 1] = '\0';
}
if (buf[0] == '#' && buf[1] == '!') {
trim_trailing_whitespaces(buf + 2);
} else {
buf[2] = '\0';
}
interp = buf + 2;
}
if (interp[0] != '\0') {
GetFullPathNameA(interp, sizeof(full_interp), full_interp, NULL);
interp = full_interp;
}
GetFullPathNameA(dir, sizeof(full_dir), full_dir, NULL);
mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s\"%s\\%s\"",
interp, interp[0] == '\0' ? "" : " ", full_dir, prog);
DEBUG_TRACE(("Running [%s]", cmdline));
if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
CREATE_NEW_PROCESS_GROUP, envblk, NULL, &si, &pi) == 0) {
cry(conn, "%s: CreateProcess(%s): %ld",
__func__, cmdline, ERRNO);
pi.hProcess = (pid_t) -1;
}
(void) CloseHandle(si.hStdOutput);
(void) CloseHandle(si.hStdInput);
(void) CloseHandle(pi.hThread);
return (pid_t) pi.hProcess;
}
#endif // !NO_CGI
static int set_non_blocking_mode(SOCKET sock) {
unsigned long on = 1;
return ioctlsocket(sock, FIONBIO, &on);
}
#else
static int mg_stat(struct mg_connection *conn, const char *path,
struct file *filep) {
struct stat st;
if (!is_file_in_memory(conn, path, filep) && !stat(path, &st)) {
filep->size = st.st_size;
filep->modification_time = st.st_mtime;
filep->is_directory = S_ISDIR(st.st_mode);
// See https://github.com/cesanta/mongoose/issues/109
// Some filesystems report modification time as 0. Artificially
// bump it up to mark mg_stat() success.
if (filep->modification_time == (time_t) 0) {
filep->modification_time = (time_t) 1;
}
} else {
filep->modification_time = (time_t) 0;
}
return filep->membuf != NULL || filep->modification_time != (time_t) 0;
}
static void set_close_on_exec(int fd) {
fcntl(fd, F_SETFD, FD_CLOEXEC);
}
int mg_start_thread(mg_thread_func_t func, void *param) {
pthread_t thread_id;
pthread_attr_t attr;
int result;
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
#if USE_STACK_SIZE > 1
// Compile-time option to control stack size, e.g. -DUSE_STACK_SIZE=16384
(void) pthread_attr_setstacksize(&attr, USE_STACK_SIZE);
#endif
result = pthread_create(&thread_id, &attr, func, param);
pthread_attr_destroy(&attr);
return result;
}
#ifndef NO_CGI
static pid_t spawn_process(struct mg_connection *conn, const char *prog,
char *envblk, char *envp[], int fdin,
int fdout, const char *dir) {
pid_t pid;
const char *interp;
(void) envblk;
if ((pid = fork()) == -1) {
// Parent
send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
} else if (pid == 0) {
// Child
if (chdir(dir) != 0) {
cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
} else if (dup2(fdin, 0) == -1) {
cry(conn, "%s: dup2(%d, 0): %s", __func__, fdin, strerror(ERRNO));
} else if (dup2(fdout, 1) == -1) {
cry(conn, "%s: dup2(%d, 1): %s", __func__, fdout, strerror(ERRNO));
} else {
// Not redirecting stderr to stdout, to avoid output being littered
// with the error messages.
(void) close(fdin);
(void) close(fdout);
// After exec, all signal handlers are restored to their default values,
// with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
// implementation, SIGCHLD's handler will leave unchanged after exec
// if it was set to be ignored. Restore it to default action.
signal(SIGCHLD, SIG_DFL);
interp = conn->ctx->config[CGI_INTERPRETER];
if (interp == NULL) {
(void) execle(prog, prog, NULL, envp);
cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
} else {
(void) execle(interp, interp, prog, NULL, envp);
cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
strerror(ERRNO));
}
}
exit(EXIT_FAILURE);
}
return pid;
}
#endif // !NO_CGI
static int set_non_blocking_mode(SOCKET sock) {
int flags;
flags = fcntl(sock, F_GETFL, 0);
(void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
return 0;
}
#endif // _WIN32
// Write data to the IO channel - opened file descriptor, socket or SSL
// descriptor. Return number of bytes written.
static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
int64_t len) {
int64_t sent;
int n, k;
(void) ssl; // Get rid of warning
sent = 0;
while (sent < len) {
// How many bytes we send in this iteration
k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
#ifndef NO_SSL
if (ssl != NULL) {
n = SSL_write(ssl, buf + sent, k);
} else
#endif
if (fp != NULL) {
n = (int) fwrite(buf + sent, 1, (size_t) k, fp);
if (ferror(fp))
n = -1;
} else {
n = send(sock, buf + sent, (size_t) k, MSG_NOSIGNAL);
}
if (n <= 0)
break;
sent += n;
}
return sent;
}
// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
// Return negative value on error, or number of bytes read on success.
static int pull(FILE *fp, struct mg_connection *conn, char *buf, int len) {
int nread;
if (fp != NULL) {
// Use read() instead of fread(), because if we're reading from the CGI
// pipe, fread() may block until IO buffer is filled up. We cannot afford
// to block and must pass all read bytes immediately to the client.
nread = read(fileno(fp), buf, (size_t) len);
#ifndef NO_SSL
} else if (conn->ssl != NULL) {
nread = SSL_read(conn->ssl, buf, len);
#endif
} else {
nread = recv(conn->client.sock, buf, (size_t) len, 0);
}
return conn->ctx->stop_flag ? -1 : nread;
}
static int pull_all(FILE *fp, struct mg_connection *conn, char *buf, int len) {
int n, nread = 0;
while (len > 0 && conn->ctx->stop_flag == 0) {
n = pull(fp, conn, buf + nread, len);
if (n < 0) {
nread = n; // Propagate the error
break;
} else if (n == 0) {
break; // No more data to read
} else {
conn->consumed_content += n;
nread += n;
len -= n;
}
}
return nread;
}
int mg_read(struct mg_connection *conn, void *buf, size_t len) {
int n, buffered_len, nread;
const char *body;
// If Content-Length is not set, read until socket is closed
if (conn->consumed_content == 0 && conn->content_len == 0) {
conn->content_len = INT64_MAX;
conn->must_close = 1;
}
nread = 0;
if (conn->consumed_content < conn->content_len) {
// Adjust number of bytes to read.
int64_t to_read = conn->content_len - conn->consumed_content;
if (to_read < (int64_t) len) {
len = (size_t) to_read;
}
// Return buffered data
body = conn->buf + conn->request_len + conn->consumed_content;
buffered_len = &conn->buf[conn->data_len] - body;
if (buffered_len > 0) {
if (len < (size_t) buffered_len) {
buffered_len = (int) len;
}
memcpy(buf, body, (size_t) buffered_len);
len -= buffered_len;
conn->consumed_content += buffered_len;
nread += buffered_len;
buf = (char *) buf + buffered_len;
}
// We have returned all buffered data. Read new data from the remote socket.
n = pull_all(NULL, conn, (char *) buf, (int) len);
nread = n >= 0 ? nread + n : n;
}
return nread;
}
int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
time_t now;
int64_t n, total, allowed;
if (conn->throttle > 0) {
if ((now = time(NULL)) != conn->last_throttle_time) {
conn->last_throttle_time = now;
conn->last_throttle_bytes = 0;
}
allowed = conn->throttle - conn->last_throttle_bytes;
if (allowed > (int64_t) len) {
allowed = len;
}
if ((total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) == allowed) {
buf = (char *) buf + total;
conn->last_throttle_bytes += total;
while (total < (int64_t) len && conn->ctx->stop_flag == 0) {
allowed = conn->throttle > (int64_t) len - total ?
(int64_t) len - total : conn->throttle;
if ((n = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) allowed)) != allowed) {
break;
}
sleep(1);
conn->last_throttle_bytes = allowed;
conn->last_throttle_time = time(NULL);
buf = (char *) buf + n;
total += n;
}
}
} else {
total = push(NULL, conn->client.sock, conn->ssl, (const char *) buf,
(int64_t) len);
}
return (int) total;
}
// Print message to buffer. If buffer is large enough to hold the message,
// return buffer. If buffer is to small, allocate large enough buffer on heap,
// and return allocated buffer.
static int alloc_vprintf(char **buf, size_t size, const char *fmt, va_list ap) {
va_list ap_copy;
int len;
// Windows is not standard-compliant, and vsnprintf() returns -1 if
// buffer is too small. Also, older versions of msvcrt.dll do not have
// _vscprintf(). However, if size is 0, vsnprintf() behaves correctly.
// Therefore, we make two passes: on first pass, get required message length.
// On second pass, actually print the message.
va_copy(ap_copy, ap);
len = vsnprintf(NULL, 0, fmt, ap_copy);
if (len > (int) size &&
(size = len + 1) > 0 &&
(*buf = (char *) malloc(size)) == NULL) {
len = -1; // Allocation failed, mark failure
} else {
va_copy(ap_copy, ap);
vsnprintf(*buf, size, fmt, ap_copy);
}
return len;
}
int mg_vprintf(struct mg_connection *conn, const char *fmt, va_list ap) {
char mem[MG_BUF_LEN], *buf = mem;
int len;
if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
len = mg_write(conn, buf, (size_t) len);
}
if (buf != mem && buf != NULL) {
free(buf);
}
return len;
}
int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
return mg_vprintf(conn, fmt, ap);
}
static int mg_chunked_printf(struct mg_connection *conn, const char *fmt, ...) {
char mem[MG_BUF_LEN], *buf = mem;
int len;
va_list ap;
va_start(ap, fmt);
if ((len = alloc_vprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
len = mg_printf(conn, "%X\r\n%s\r\n", len, buf);
}
if (buf != mem && buf != NULL) {
free(buf);
}
return len;
}
int mg_url_decode(const char *src, int src_len, char *dst,
int dst_len, int is_form_url_encoded) {
int i, j, a, b;
#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
if (src[i] == '%' && i < src_len - 2 &&
isxdigit(* (const unsigned char *) (src + i + 1)) &&
isxdigit(* (const unsigned char *) (src + i + 2))) {
a = tolower(* (const unsigned char *) (src + i + 1));
b = tolower(* (const unsigned char *) (src + i + 2));
dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
i += 2;
} else if (is_form_url_encoded && src[i] == '+') {
dst[j] = ' ';
} else {
dst[j] = src[i];
}
}
dst[j] = '\0'; // Null-terminate the destination
return i >= src_len ? j : -1;
}
int mg_get_var(const char *data, size_t data_len, const char *name,
char *dst, size_t dst_len) {
const char *p, *e, *s;
size_t name_len;
int len;
if (dst == NULL || dst_len == 0) {
len = -2;
} else if (data == NULL || name == NULL || data_len == 0) {
len = -1;
dst[0] = '\0';
} else {
name_len = strlen(name);
e = data + data_len;
len = -1;
dst[0] = '\0';
// data is "var1=val1&var2=val2...". Find variable first
for (p = data; p + name_len < e; p++) {
if ((p == data || p[-1] == '&') && p[name_len] == '=' &&
!mg_strncasecmp(name, p, name_len)) {
// Point p to variable value
p += name_len + 1;
// Point s to the end of the value
s = (const char *) memchr(p, '&', (size_t)(e - p));
if (s == NULL) {
s = e;
}
assert(s >= p);
// Decode variable into destination buffer
len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
// Redirect error code from -1 to -2 (destination buffer too small).
if (len == -1) {
len = -2;
}
break;
}
}
}
return len;
}
int mg_get_cookie(const char *cookie_header, const char *var_name,
char *dst, size_t dst_size) {
const char *s, *p, *end;
int name_len, len = -1;
if (dst == NULL || dst_size == 0) {
len = -2;
} else if (var_name == NULL || (s = cookie_header) == NULL) {
len = -1;
dst[0] = '\0';
} else {
name_len = (int) strlen(var_name);
end = s + strlen(s);
dst[0] = '\0';
for (; (s = mg_strcasestr(s, var_name)) != NULL; s += name_len) {
if (s[name_len] == '=') {
s += name_len + 1;
if ((p = strchr(s, ' ')) == NULL)
p = end;
if (p[-1] == ';')
p--;
if (*s == '"' && p[-1] == '"' && p > s + 1) {
s++;
p--;
}
if ((size_t) (p - s) < dst_size) {
len = p - s;
mg_strlcpy(dst, s, (size_t) len + 1);
} else {
len = -3;
}
break;
}
}
}
return len;
}
static void convert_uri_to_file_name(struct mg_connection *conn, char *buf,
size_t buf_len, struct file *filep) {
struct vec a, b;
const char *rewrite, *uri = conn->request_info.uri,
*root = conn->ctx->config[DOCUMENT_ROOT];
char *p;
int match_len;
char gz_path[PATH_MAX];
char const* accept_encoding;
// Using buf_len - 1 because memmove() for PATH_INFO may shift part
// of the path one byte on the right.
// If document_root is NULL, leave the file empty.
mg_snprintf(conn, buf, buf_len - 1, "%s%s",
root == NULL ? "" : root,
root == NULL ? "" : uri);
rewrite = conn->ctx->config[REWRITE];
while ((rewrite = next_option(rewrite, &a, &b)) != NULL) {
if ((match_len = match_prefix(a.ptr, a.len, uri)) > 0) {
mg_snprintf(conn, buf, buf_len - 1, "%.*s%s", (int) b.len, b.ptr,
uri + match_len);
break;
}
}
if (mg_stat(conn, buf, filep)) return;
// if we can't find the actual file, look for the file
// with the same name but a .gz extension. If we find it,
// use that and set the gzipped flag in the file struct
// to indicate that the response need to have the content-
// encoding: gzip header
// we can only do this if the browser declares support
if ((accept_encoding = mg_get_header(conn, "Accept-Encoding")) != NULL) {
if (strstr(accept_encoding,"gzip") != NULL) {
snprintf(gz_path, sizeof(gz_path), "%s.gz", buf);
if (mg_stat(conn, gz_path, filep)) {
filep->gzipped = 1;
return;
}
}
}
// Support PATH_INFO for CGI scripts.
for (p = buf + strlen(root == NULL ? "" : root); *p != '\0'; p++) {
if (*p == '/') {
*p = '\0';
if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]), buf) > 0 &&
mg_stat(conn, buf, filep)) {
// Shift PATH_INFO block one character right, e.g.
// "/x.cgi/foo/bar\x00" => "/x.cgi\x00/foo/bar\x00"
// conn->path_info is pointing to the local variable "path" declared
// in handle_request(), so PATH_INFO is not valid after
// handle_request returns.
conn->path_info = p + 1;
memmove(p + 2, p + 1, strlen(p + 1) + 1); // +1 is for trailing \0
p[1] = '/';
break;
} else {
*p = '/';
}
}
}
}
// Check whether full request is buffered. Return:
// -1 if request is malformed
// 0 if request is not yet fully buffered
// >0 actual request length, including last \r\n\r\n
static int get_request_len(const char *buf, int buflen) {
const char *s, *e;
int len = 0;
for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
// Control characters are not allowed but >=128 is.
if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
*s != '\n' && * (const unsigned char *) s < 128) {
len = -1;
break; // [i_a] abort scan as soon as one malformed character is found;
// don't let subsequent \r\n\r\n win us over anyhow
} else if (s[0] == '\n' && s[1] == '\n') {
len = (int) (s - buf) + 2;
} else if (s[0] == '\n' && &s[1] < e &&
s[1] == '\r' && s[2] == '\n') {
len = (int) (s - buf) + 3;
}
return len;
}
// Convert month to the month number. Return -1 on error, or month number
static int get_month_index(const char *s) {
size_t i;
for (i = 0; i < ARRAY_SIZE(month_names); i++)
if (!strcmp(s, month_names[i]))
return (int) i;
return -1;
}
static int num_leap_years(int year) {
return year / 4 - year / 100 + year / 400;
}
// Parse UTC date-time string, and return the corresponding time_t value.
static time_t parse_date_string(const char *datetime) {
static const unsigned short days_before_month[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
char month_str[32];
int second, minute, hour, day, month, year, leap_days, days;
time_t result = (time_t) 0;
if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%d %3s %d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6) ||
(sscanf(datetime, "%d-%3s-%d %d:%d:%d",
&day, month_str, &year, &hour, &minute, &second) == 6)) &&
year > 1970 &&
(month = get_month_index(month_str)) != -1) {
leap_days = num_leap_years(year) - num_leap_years(1970);
year -= 1970;
days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
}
return result;
}
// Protect against directory disclosure attack by removing '..',
// excessive '/' and '\' characters
static void remove_double_dots_and_double_slashes(char *s) {
char *p = s;
while (*s != '\0') {
*p++ = *s++;
if (s[-1] == '/' || s[-1] == '\\') {
// Skip all following slashes, backslashes and double-dots
while (s[0] != '\0') {
if (s[0] == '/' || s[0] == '\\') {
s++;
} else if (s[0] == '.' && s[1] == '.') {
s += 2;
} else {
break;
}
}
}
}
*p = '\0';
}
static const struct {
const char *extension;
size_t ext_len;
const char *mime_type;
} builtin_mime_types[] = {
{".html", 5, "text/html"},
{".htm", 4, "text/html"},
{".shtm", 5, "text/html"},
{".shtml", 6, "text/html"},
{".css", 4, "text/css"},
{".js", 3, "application/x-javascript"},
{".ico", 4, "image/x-icon"},
{".gif", 4, "image/gif"},
{".jpg", 4, "image/jpeg"},
{".jpeg", 5, "image/jpeg"},
{".png", 4, "image/png"},
{".svg", 4, "image/svg+xml"},
{".txt", 4, "text/plain"},
{".torrent", 8, "application/x-bittorrent"},
{".wav", 4, "audio/x-wav"},
{".mp3", 4, "audio/x-mp3"},
{".mid", 4, "audio/mid"},
{".m3u", 4, "audio/x-mpegurl"},
{".ogg", 4, "application/ogg"},
{".ram", 4, "audio/x-pn-realaudio"},
{".xml", 4, "text/xml"},
{".json", 5, "text/json"},
{".xslt", 5, "application/xml"},
{".xsl", 4, "application/xml"},
{".ra", 3, "audio/x-pn-realaudio"},
{".doc", 4, "application/msword"},
{".exe", 4, "application/octet-stream"},
{".zip", 4, "application/x-zip-compressed"},
{".xls", 4, "application/excel"},
{".tgz", 4, "application/x-tar-gz"},
{".tar", 4, "application/x-tar"},
{".gz", 3, "application/x-gunzip"},
{".arj", 4, "application/x-arj-compressed"},
{".rar", 4, "application/x-arj-compressed"},
{".rtf", 4, "application/rtf"},
{".pdf", 4, "application/pdf"},
{".swf", 4, "application/x-shockwave-flash"},
{".mpg", 4, "video/mpeg"},
{".webm", 5, "video/webm"},
{".mpeg", 5, "video/mpeg"},
{".mov", 4, "video/quicktime"},
{".mp4", 4, "video/mp4"},
{".m4v", 4, "video/x-m4v"},
{".asf", 4, "video/x-ms-asf"},
{".avi", 4, "video/x-msvideo"},
{".bmp", 4, "image/bmp"},
{".ttf", 4, "application/x-font-ttf"},
{NULL, 0, NULL}
};
const char *mg_get_builtin_mime_type(const char *path) {
const char *ext;
size_t i, path_len;
path_len = strlen(path);
for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
ext = path + (path_len - builtin_mime_types[i].ext_len);
if (path_len > builtin_mime_types[i].ext_len &&
mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
return builtin_mime_types[i].mime_type;
}
}
return "application/octet-stream";
}
// Look at the "path" extension and figure what mime type it has.
// Store mime type in the vector.
static void get_mime_type(struct mg_context *ctx, const char *path,
struct vec *vec) {
struct vec ext_vec, mime_vec;
const char *list, *ext;
size_t path_len;
path_len = strlen(path);
// Scan user-defined mime types first, in case user wants to
// override default mime types.
list = ctx->config[EXTRA_MIME_TYPES];
while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
// ext now points to the path suffix
ext = path + path_len - ext_vec.len;
if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
*vec = mime_vec;
return;
}
}
vec->ptr = mg_get_builtin_mime_type(path);
vec->len = strlen(vec->ptr);
}
static int is_big_endian(void) {
static const int n = 1;
return ((char *) &n)[0] == 0;
}
#ifndef HAVE_MD5
typedef struct MD5Context {
uint32_t buf[4];
uint32_t bits[2];
unsigned char in[64];
} MD5_CTX;
static void byteReverse(unsigned char *buf, unsigned longs) {
uint32_t t;
// Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN
if (is_big_endian()) {
do {
t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
((unsigned) buf[1] << 8 | buf[0]);
* (uint32_t *) buf = t;
buf += 4;
} while (--longs);
}
}
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
#define MD5STEP(f, w, x, y, z, data, s) \
( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
// Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
// initialization constants.
static void MD5Init(MD5_CTX *ctx) {
ctx->buf[0] = 0x67452301;
ctx->buf[1] = 0xefcdab89;
ctx->buf[2] = 0x98badcfe;
ctx->buf[3] = 0x10325476;
ctx->bits[0] = 0;
ctx->bits[1] = 0;
}
static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
register uint32_t a, b, c, d;
a = buf[0];
b = buf[1];
c = buf[2];
d = buf[3];
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
uint32_t t;
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
ctx->bits[1]++;
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f;
if (t) {
unsigned char *p = (unsigned char *) ctx->in + t;
t = 64 - t;
if (len < t) {
memcpy(p, buf, len);
return;
}
memcpy(p, buf, t);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += t;
len -= t;
}
while (len >= 64) {
memcpy(ctx->in, buf, 64);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
buf += 64;
len -= 64;
}
memcpy(ctx->in, buf, len);
}
static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
unsigned count;
unsigned char *p;
uint32_t *a;
count = (ctx->bits[0] >> 3) & 0x3F;
p = ctx->in + count;
*p++ = 0x80;
count = 64 - 1 - count;
if (count < 8) {
memset(p, 0, count);
byteReverse(ctx->in, 16);
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
memset(ctx->in, 0, 56);
} else {
memset(p, 0, count - 8);
}
byteReverse(ctx->in, 14);
a = (uint32_t *)ctx->in;
a[14] = ctx->bits[0];
a[15] = ctx->bits[1];
MD5Transform(ctx->buf, (uint32_t *) ctx->in);
byteReverse((unsigned char *) ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
memset((char *) ctx, 0, sizeof(*ctx));
}
#endif // !HAVE_MD5
// Stringify binary data. Output buffer must be twice as big as input,
// because each byte takes 2 bytes in string representation
static void bin2str(char *to, const unsigned char *p, size_t len) {
static const char *hex = "0123456789abcdef";
for (; len--; p++) {
*to++ = hex[p[0] >> 4];
*to++ = hex[p[0] & 0x0f];
}
*to = '\0';
}
// Return stringified MD5 hash for list of strings. Buffer must be 33 bytes.
char *mg_md5(char buf[33], ...) {
unsigned char hash[16];
const char *p;
va_list ap;
MD5_CTX ctx;
MD5Init(&ctx);
va_start(ap, buf);
while ((p = va_arg(ap, const char *)) != NULL) {
MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
}
va_end(ap);
MD5Final(hash, &ctx);
bin2str(buf, hash, sizeof(hash));
return buf;
}
// Check the user's password, return 1 if OK
static int check_password(const char *method, const char *ha1, const char *uri,
const char *nonce, const char *nc, const char *cnonce,
const char *qop, const char *response) {
char ha2[32 + 1], expected_response[32 + 1];
// Some of the parameters may be NULL
if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
qop == NULL || response == NULL) {
return 0;
}
// NOTE(lsm): due to a bug in MSIE, we do not compare the URI
// TODO(lsm): check for authentication timeout
if (// strcmp(dig->uri, c->ouri) != 0 ||
strlen(response) != 32
// || now - strtoul(dig->nonce, NULL, 10) > 3600
) {
return 0;
}
mg_md5(ha2, method, ":", uri, NULL);
mg_md5(expected_response, ha1, ":", nonce, ":", nc,
":", cnonce, ":", qop, ":", ha2, NULL);
return mg_strcasecmp(response, expected_response) == 0;
}
// Use the global passwords file, if specified by auth_gpass option,
// or search for .htpasswd in the requested directory.
static void open_auth_file(struct mg_connection *conn, const char *path,
struct file *filep) {
char name[PATH_MAX];
const char *p, *e, *gpass = conn->ctx->config[GLOBAL_PASSWORDS_FILE];
struct file file = STRUCT_FILE_INITIALIZER;
if (gpass != NULL) {
// Use global passwords file
if (!mg_fopen(conn, gpass, "r", filep)) {
cry(conn, "fopen(%s): %s", gpass, strerror(ERRNO));
}
// Important: using local struct file to test path for is_directory flag.
// If filep is used, mg_stat() makes it appear as if auth file was opened.
} else if (mg_stat(conn, path, &file) && file.is_directory) {
mg_snprintf(conn, name, sizeof(name), "%s%c%s",
path, '/', PASSWORDS_FILE_NAME);
mg_fopen(conn, name, "r", filep);
} else {
// Try to find .htpasswd in requested directory.
for (p = path, e = p + strlen(p) - 1; e > p; e--)
if (e[0] == '/')
break;
mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
(int) (e - p), p, '/', PASSWORDS_FILE_NAME);
mg_fopen(conn, name, "r", filep);
}
}
// Parsed Authorization header
struct ah {
char *user, *uri, *cnonce, *response, *qop, *nc, *nonce, *realm;
};
// Return 1 on success. Always initializes the ah structure.
static int parse_auth_header(struct mg_connection *conn, char *buf,
size_t buf_size, struct ah *ah) {
char *name, *value, *s;
const char *auth_header;
(void) memset(ah, 0, sizeof(*ah));
if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
return 0;
}
// Make modifiable copy of the auth header
(void) mg_strlcpy(buf, auth_header + 7, buf_size);
s = buf;
// Parse authorization header
for (;;) {
// Gobble initial spaces
while (isspace(* (unsigned char *) s)) {
s++;
}
name = skip_quoted(&s, "=", " ", 0);
// Value is either quote-delimited, or ends at first comma or space.
if (s[0] == '\"') {
s++;
value = skip_quoted(&s, "\"", " ", '\\');
if (s[0] == ',') {
s++;
}
} else {
value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces
}
if (*name == '\0') {
break;
}
if (!strcmp(name, "username")) {
ah->user = value;
} else if (!strcmp(name, "cnonce")) {
ah->cnonce = value;
} else if (!strcmp(name, "response")) {
ah->response = value;
} else if (!strcmp(name, "uri")) {
ah->uri = value;
} else if (!strcmp(name, "realm")) {
ah->realm = value;
} else if (!strcmp(name, "qop")) {
ah->qop = value;
} else if (!strcmp(name, "nc")) {
ah->nc = value;
} else if (!strcmp(name, "nonce")) {
ah->nonce = value;
}
}
// CGI needs it as REMOTE_USER
if (ah->user != NULL) {
conn->request_info.remote_user = mg_strdup(ah->user);
} else {
return 0;
}
return 1;
}
static char *mg_fgets(char *buf, size_t size, struct file *filep, char **p) {
char *eof;
size_t len;
char *memend;
if (filep->membuf != NULL && *p != NULL) {
memend = (char *) &filep->membuf[filep->size];
// Search for \n from p till the end of stream
eof = (char *) memchr(*p, '\n', memend - *p);
if (eof != NULL) {
eof += 1; // Include \n
} else {
eof = memend; // Copy remaining data
}
len = (size_t) (eof - *p) > size - 1 ? size - 1 : (size_t) (eof - *p);
memcpy(buf, *p, len);
buf[len] = '\0';
*p += len;
return len ? eof : NULL;
} else if (filep->fp != NULL) {
return fgets(buf, size, filep->fp);
} else {
return NULL;
}
}
// Authorize against the opened passwords file. Return 1 if authorized.
/* XXX Original mongoose authorize function...
static int authorize(struct mg_connection *conn, struct file *filep) {
struct ah ah;
char line[256], f_user[256], ha1[256], f_domain[256], buf[MG_BUF_LEN], *p;
if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
return 0;
}
// Loop over passwords file
p = (char *) filep->membuf;
while (mg_fgets(line, sizeof(line), filep, &p) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
continue;
}
if (!strcmp(ah.user, f_user) &&
!strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
return check_password(conn->request_info.request_method, ha1, ah.uri,
ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
}
return 0;
}
*/
static int
authorize(struct mg_connection *conn, struct file *filep)
{
struct ah ah;
int check;
char line[256], f_user[256], ha1[33], pwd[256],buf[MG_BUF_LEN], *p;
if (!parse_auth_header(conn, buf, sizeof(buf), &ah))
{
return 0;
}
// Loop over passwords file
p = (char *) filep->membuf;
while (mg_fgets(line, sizeof(line), filep, &p) != NULL)
{
if (sscanf(line, "%[^:]:%s", f_user, pwd) != 2)
{
continue;
}
mg_md5(ha1, f_user, "::", pwd, NULL);
if (!strcmp(ah.user, f_user))
{
check = check_password(conn->request_info.request_method, ha1, ah.uri,
ah.nonce, ah.nc, ah.cnonce, ah.qop, ah.response);
conn->auth = check;
return check;
}
}
return 0;
}
// Return 1 if request is authorised, 0 otherwise.
static int check_authorization(struct mg_connection *conn, const char *path) {
char fname[PATH_MAX];
struct vec uri_vec, filename_vec;
const char *list;
struct file file = STRUCT_FILE_INITIALIZER;
int authorized = 1;
list = conn->ctx->config[PROTECT_URI];
while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
mg_snprintf(conn, fname, sizeof(fname), "%.*s",
(int) filename_vec.len, filename_vec.ptr);
if (!mg_fopen(conn, fname, "r", &file)) {
cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
}
break;
}
}
conn->auth = 0;
if (!is_file_opened(&file)) {
open_auth_file(conn, path, &file);
}
if (is_file_opened(&file)) {
authorized = authorize(conn, &file);
mg_fclose(&file);
}
return authorized;
}
static void send_authorization_request(struct mg_connection *conn) {
conn->status_code = 401;
mg_printf(conn,
"HTTP/1.1 401 Unauthorized\r\n"
"Content-Length: 0\r\n"
"Set-Cookie: digest=1\r\n"
"WWW-Authenticate: Digest qop=\"auth\", "
"realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
conn->ctx->config[AUTHENTICATION_DOMAIN],
(unsigned long) time(NULL));
}
static int is_authorized_for_put(struct mg_connection *conn) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *passfile = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE];
int ret = 0;
if (passfile != NULL && mg_fopen(conn, passfile, "r", &file)) {
ret = authorize(conn, &file);
mg_fclose(&file);
}
return ret;
}
int mg_modify_passwords_file(const char *fname, const char *domain,
const char *user, const char *pass) {
int found;
char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
FILE *fp, *fp2;
found = 0;
fp = fp2 = NULL;
// Regard empty password as no password - remove user record.
if (pass != NULL && pass[0] == '\0') {
pass = NULL;
}
(void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
// Create the file if does not exist
if ((fp = fopen(fname, "a+")) != NULL) {
(void) fclose(fp);
}
// Open the given file and temporary file
if ((fp = fopen(fname, "r")) == NULL) {
return 0;
} else if ((fp2 = fopen(tmp, "w+")) == NULL) {
fclose(fp);
return 0;
}
// Copy the stuff to temporary file
while (fgets(line, sizeof(line), fp) != NULL) {
if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
continue;
}
if (!strcmp(u, user) && !strcmp(d, domain)) {
found++;
if (pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
} else {
fprintf(fp2, "%s", line);
}
}
// If new user, just add it
if (!found && pass != NULL) {
mg_md5(ha1, user, ":", domain, ":", pass, NULL);
fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
}
// Close files
fclose(fp);
fclose(fp2);
// Put the temp file in place of real file
remove(fname);
rename(tmp, fname);
return 1;
}
static SOCKET conn2(const char *host, int port, int use_ssl,
char *ebuf, size_t ebuf_len) {
struct sockaddr_in sin;
struct hostent *he;
SOCKET sock = INVALID_SOCKET;
if (host == NULL) {
snprintf(ebuf, ebuf_len, "%s", "NULL host");
} else if (use_ssl && SSLv23_client_method == NULL) {
snprintf(ebuf, ebuf_len, "%s", "SSL is not initialized");
// TODO(lsm): use something threadsafe instead of gethostbyname()
} else if ((he = gethostbyname(host)) == NULL) {
snprintf(ebuf, ebuf_len, "gethostbyname(%s): %s", host, strerror(ERRNO));
} else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
snprintf(ebuf, ebuf_len, "socket(): %s", strerror(ERRNO));
} else {
set_close_on_exec(sock);
sin.sin_family = AF_INET;
sin.sin_port = htons((uint16_t) port);
sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
snprintf(ebuf, ebuf_len, "connect(%s:%d): %s",
host, port, strerror(ERRNO));
closesocket(sock);
sock = INVALID_SOCKET;
}
}
return sock;
}
void mg_url_encode(const char *src, char *dst, size_t dst_len) {
static const char *dont_escape = "._-$,;~()";
static const char *hex = "0123456789abcdef";
const char *end = dst + dst_len - 1;
for (; *src != '\0' && dst < end; src++, dst++) {
if (isalnum(*(const unsigned char *) src) ||
strchr(dont_escape, * (const unsigned char *) src) != NULL) {
*dst = *src;
} else if (dst + 2 < end) {
dst[0] = '%';
dst[1] = hex[(* (const unsigned char *) src) >> 4];
dst[2] = hex[(* (const unsigned char *) src) & 0xf];
dst += 2;
}
}
*dst = '\0';
}
static void print_dir_entry(const struct de *de) {
char size[64], mod[64], href[PATH_MAX * 3];
const char *slash = de->file.is_directory ? "/" : "";
if (de->file.is_directory) {
mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
} else {
// We use (signed) cast below because MSVC 6 compiler cannot
// convert unsigned __int64 to double. Sigh.
if (de->file.size < 1024) {
mg_snprintf(de->conn, size, sizeof(size), "%d", (int) de->file.size);
} else if (de->file.size < 0x100000) {
mg_snprintf(de->conn, size, sizeof(size),
"%.1fk", (double) de->file.size / 1024.0);
} else if (de->file.size < 0x40000000) {
mg_snprintf(de->conn, size, sizeof(size),
"%.1fM", (double) de->file.size / 1048576);
} else {
mg_snprintf(de->conn, size, sizeof(size),
"%.1fG", (double) de->file.size / 1073741824);
}
}
strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M",
localtime(&de->file.modification_time));
mg_url_encode(de->file_name, href, sizeof(href));
de->conn->num_bytes_sent += mg_chunked_printf(de->conn,
"<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
"<td> %s</td><td> %s</td></tr>\n",
de->conn->request_info.uri, href, slash, de->file_name, slash, mod, size);
}
// This function is called from send_directory() and used for
// sorting directory entries by size, or name, or modification time.
// On windows, __cdecl specification is needed in case if project is built
// with __stdcall convention. qsort always requires __cdels callback.
static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
const char *query_string = a->conn->request_info.query_string;
int cmp_result = 0;
if (query_string == NULL) {
query_string = "na";
}
if (a->file.is_directory && !b->file.is_directory) {
return -1; // Always put directories on top
} else if (!a->file.is_directory && b->file.is_directory) {
return 1; // Always put directories on top
} else if (*query_string == 'n') {
cmp_result = strcmp(a->file_name, b->file_name);
} else if (*query_string == 's') {
cmp_result = a->file.size == b->file.size ? 0 :
a->file.size > b->file.size ? 1 : -1;
} else if (*query_string == 'd') {
cmp_result = a->file.modification_time == b->file.modification_time ? 0 :
a->file.modification_time > b->file.modification_time ? 1 : -1;
}
return query_string[1] == 'd' ? -cmp_result : cmp_result;
}
static int must_hide_file(struct mg_connection *conn, const char *path) {
const char *pw_pattern = "**" PASSWORDS_FILE_NAME "$";
const char *pattern = conn->ctx->config[HIDE_FILES];
return match_prefix(pw_pattern, strlen(pw_pattern), path) > 0 ||
(pattern != NULL && match_prefix(pattern, strlen(pattern), path) > 0);
}
static int scan_directory(struct mg_connection *conn, const char *dir,
void *data, void (*cb)(struct de *, void *)) {
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
if ((dirp = opendir(dir)) == NULL) {
return 0;
} else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir and hidden files
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..") ||
must_hide_file(conn, dp->d_name)) {
continue;
}
mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
// If we don't memset stat structure to zero, mtime will have
// garbage and strftime() will segfault later on in
// print_dir_entry(). memset is required only if mg_stat()
// fails. For more details, see
// http://code.google.com/p/mongoose/issues/detail?id=79
memset(&de.file, 0, sizeof(de.file));
mg_stat(conn, path, &de.file);
de.file_name = dp->d_name;
cb(&de, data);
}
(void) closedir(dirp);
}
return 1;
}
static int remove_directory(struct mg_connection *conn, const char *dir) {
char path[PATH_MAX];
struct dirent *dp;
DIR *dirp;
struct de de;
if ((dirp = opendir(dir)) == NULL) {
return 0;
} else {
de.conn = conn;
while ((dp = readdir(dirp)) != NULL) {
// Do not show current dir, but show hidden files
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, "..")) {
continue;
}
mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
// If we don't memset stat structure to zero, mtime will have
// garbage and strftime() will segfault later on in
// print_dir_entry(). memset is required only if mg_stat()
// fails. For more details, see
// http://code.google.com/p/mongoose/issues/detail?id=79
memset(&de.file, 0, sizeof(de.file));
mg_stat(conn, path, &de.file);
if(de.file.modification_time) {
if(de.file.is_directory) {
remove_directory(conn, path);
} else {
mg_remove(path);
}
}
}
(void) closedir(dirp);
rmdir(dir);
}
return 1;
}
struct dir_scan_data {
struct de *entries;
int num_entries;
int arr_size;
};
// Behaves like realloc(), but frees original pointer on failure
static void *realloc2(void *ptr, size_t size) {
void *new_ptr = realloc(ptr, size);
if (new_ptr == NULL) {
free(ptr);
}
return new_ptr;
}
static void dir_scan_callback(struct de *de, void *data) {
struct dir_scan_data *dsd = (struct dir_scan_data *) data;
if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
dsd->arr_size *= 2;
dsd->entries = (struct de *) realloc2(dsd->entries, dsd->arr_size *
sizeof(dsd->entries[0]));
}
if (dsd->entries == NULL) {
// TODO(lsm): propagate an error to the caller
dsd->num_entries = 0;
} else {
dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
dsd->entries[dsd->num_entries].file = de->file;
dsd->entries[dsd->num_entries].conn = de->conn;
dsd->num_entries++;
}
}
static void handle_directory_request(struct mg_connection *conn,
const char *dir) {
int i, sort_direction;
struct dir_scan_data data = { NULL, 0, 128 };
if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
send_http_error(conn, 500, "Cannot open directory",
"Error: opendir(%s): %s", dir, strerror(ERRNO));
return;
}
sort_direction = conn->request_info.query_string != NULL &&
conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
conn->must_close = 1;
mg_printf(conn, "%s",
"HTTP/1.1 200 OK\r\n"
"Transfer-Encoding: Chunked\r\n"
"Content-Type: text/html; charset=utf-8\r\n\r\n");
conn->num_bytes_sent += mg_chunked_printf(conn,
"<html><head><title>Index of %s</title>"
"<style>th {text-align: left;}</style></head>"
"<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
"<tr><th><a href=\"?n%c\">Name</a></th>"
"<th><a href=\"?d%c\">Modified</a></th>"
"<th><a href=\"?s%c\">Size</a></th></tr>"
"<tr><td colspan=\"3\"><hr></td></tr>",
conn->request_info.uri, conn->request_info.uri,
sort_direction, sort_direction, sort_direction);
// Print first entry - link to a parent directory
conn->num_bytes_sent += mg_chunked_printf(conn,
"<tr><td><a href=\"%s%s\">%s</a></td>"
"<td> %s</td><td> %s</td></tr>\n",
conn->request_info.uri, "..", "Parent directory", "-", "-");
// Sort and print directory entries
qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
compare_dir_entries);
for (i = 0; i < data.num_entries; i++) {
print_dir_entry(&data.entries[i]);
free(data.entries[i].file_name);
}
free(data.entries);
conn->num_bytes_sent += mg_chunked_printf(conn, "%s",
"</table></body></html>");
conn->num_bytes_sent += mg_write(conn, "0\r\n\r\n", 5);
conn->status_code = 200;
}
// Send bytes from the opened pipe to the client.
static void send_pipe_data(struct mg_connection *conn, int pipefd)
{
char buf[MG_BUF_LEN];
int to_read, num_read, num_written;
while (1)
{
// Calculate how much to read from the file in the buffer
to_read = sizeof(buf);
// Read from file, exit the loop on error
if ((num_read = read(pipefd, buf, (size_t) to_read)) <= 0)
{
break;
}
// Send read bytes to the client, exit the loop on error
if (mg_printf(conn, "%X\r\n", num_read) == 0)
{
break;
}
if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read)
{
break;
}
if (mg_printf(conn, "\r\n") != 2) {
break;
}
// Both read and were successful, adjust counters
conn->num_bytes_sent += num_written;
}
mg_printf(conn, "0\r\n\r\n");
}
/* Send gzip compressed (RFC 1952) bytes from the opened pipe to the client.
* opt specifies the compression level
* Adapted from:
* zpipe.c example of proper use of zlib's inflate() and deflate()
* Not copyrighted -- provided to the public domain
* Version 1.4 11 December 2005 Mark Adler
*/
static void send_pipe_data_gz(struct mg_connection *conn, int pipefd, int opt)
{
int flush, ret;
unsigned have, num_written;
z_stream strm;
unsigned char in[MG_BUF_LEN];
unsigned char out[MG_BUF_LEN];
FILE *source = fdopen(pipefd,"r");
int level = Z_DEFAULT_COMPRESSION;
/* check that user supplied a valid compression level */
if(opt>0 && opt < 10) level = opt;
/* allocate deflate state */
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
ret = deflateInit2(&strm, level, Z_DEFLATED, windowBits | GZIP_ENCODING, 8, Z_DEFAULT_STRATEGY);
if (ret != Z_OK) goto bail;
/* compress until end of file */
do
{
strm.avail_in = fread(in, 1, MG_BUF_LEN, source);
if (ferror(source))
{
(void)deflateEnd(&strm);
goto end;
}
flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
strm.next_in = in;
/* run deflate() on input until output buffer not full, finish
compression if all of source has been read in */
do
{
strm.avail_out = MG_BUF_LEN;
strm.next_out = out;
ret = deflate(&strm, flush);
have = MG_BUF_LEN - strm.avail_out;
// we can't send 0-size payloads here, or
// it signals the end of a payload
if (have > 0) {
// Send read bytes to the client, exit the loop on error
if (mg_printf(conn, "%X\r\n", have) <= 0) goto bail;
if ((num_written = mg_write(conn, out, (size_t) have)) != have)
{
syslog(LOG_ERR, "send_pipe_data_gz ERROR WRITING TO PIPE");
goto bail;
}
if (mg_printf(conn, "\r\n") != 2) goto bail;
/* read and were successful, adjust counter */
conn->num_bytes_sent += num_written;
}
} while (strm.avail_out == 0);
/* done when last data in file processed */
} while (flush != Z_FINISH);
bail:
(void)deflateEnd(&strm);
fclose(source);
end:
mg_printf(conn, "0\r\n\r\n");
syslog(LOG_INFO, "send_pipe_data_gz DONE");
}
// Send len bytes from the opened file to the client.
static void send_file_data(struct mg_connection *conn, struct file *filep,
int64_t offset, int64_t len) {
char buf[MG_BUF_LEN];
int to_read, num_read, num_written;
// Sanity check the offset
offset = offset < 0 ? 0 : offset > filep->size ? filep->size : offset;
if (len > 0 && filep->membuf != NULL && filep->size > 0) {
if (len > filep->size - offset) {
len = filep->size - offset;
}
mg_write(conn, filep->membuf + offset, (size_t) len);
} else if (len > 0 && filep->fp != NULL) {
fseeko(filep->fp, offset, SEEK_SET);
while (len > 0) {
// Calculate how much to read from the file in the buffer
to_read = sizeof(buf);
if ((int64_t) to_read > len) {
to_read = (int) len;
}
// Read from file, exit the loop on error
if ((num_read = fread(buf, 1, (size_t) to_read, filep->fp)) <= 0) {
break;
}
// Send read bytes to the client, exit the loop on error
if ((num_written = mg_write(conn, buf, (size_t) num_read)) != num_read) {
break;
}
// Both read and were successful, adjust counters
conn->num_bytes_sent += num_written;
len -= num_written;
}
}
}
static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
}
static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
}
static void construct_etag(char *buf, size_t buf_len,
const struct file *filep) {
snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
(unsigned long) filep->modification_time, filep->size);
}
static void fclose_on_exec(struct file *filep) {
if (filep != NULL && filep->fp != NULL) {
#ifndef _WIN32
fcntl(fileno(filep->fp), F_SETFD, FD_CLOEXEC);
#endif
}
}
static void handle_file_request(struct mg_connection *conn, const char *path,
struct file *filep) {
char date[64], lm[64], etag[64], range[64];
const char *msg = "OK", *hdr;
time_t curtime = time(NULL);
int64_t cl, r1, r2;
struct vec mime_vec;
int n;
char gz_path[PATH_MAX];
char const* encoding = "";
get_mime_type(conn->ctx, path, &mime_vec);
cl = filep->size;
conn->status_code = 200;
range[0] = '\0';
// if this file is in fact a pre-gzipped file, rewrite its filename
// it's important to rewrite the filename after resolving
// the mime type from it, to preserve the actual file's type
if (filep->gzipped) {
snprintf(gz_path, sizeof(gz_path), "%s.gz", path);
path = gz_path;
encoding = "Content-Encoding: gzip\r\n";
}
if (!mg_fopen(conn, path, "rb", filep)) {
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
return;
}
fclose_on_exec(filep);
// If Range: header specified, act accordingly
r1 = r2 = 0;
hdr = mg_get_header(conn, "Range");
if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0 &&
r1 >= 0 && r2 >= 0) {
// actually, range requests don't play well with a pre-gzipped
// file (since the range is specified in the uncmpressed space)
if (filep->gzipped) {
send_http_error(conn, 501, "Not Implemented",
"range requests in gzipped files are not supported");
return;
}
conn->status_code = 206;
cl = n == 2 ? (r2 > cl ? cl : r2) - r1 + 1: cl - r1;
mg_snprintf(conn, range, sizeof(range),
"Content-Range: bytes "
"%" INT64_FMT "-%"
INT64_FMT "/%" INT64_FMT "\r\n",
r1, r1 + cl - 1, filep->size);
msg = "Partial Content";
}
// Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
gmt_time_string(date, sizeof(date), &curtime);
gmt_time_string(lm, sizeof(lm), &filep->modification_time);
construct_etag(etag, sizeof(etag), filep);
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Date: %s\r\n"
"Last-Modified: %s\r\n"
"Etag: %s\r\n"
"Content-Type: %.*s\r\n"
"Content-Length: %" INT64_FMT "\r\n"
"Connection: %s\r\n"
"Accept-Ranges: bytes\r\n"
"%s%s%s\r\n",
conn->status_code, msg, date, lm, etag, (int) mime_vec.len,
mime_vec.ptr, cl, suggest_connection_header(conn), range, encoding,
EXTRA_HTTP_HEADERS);
if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
send_file_data(conn, filep, r1, cl);
}
mg_fclose(filep);
}
static void handle_pipe_request(struct mg_connection *conn,
const char *path, int opt, int level)
{
char date[64];
const char *msg = "OK";
const char *encoding = "";
time_t curtime = time(NULL);
int pipefd = -1;
struct vec mime_vec;
get_mime_type(conn->ctx, path, &mime_vec);
if(opt>1) encoding = "Content-Encoding: gzip\r\n";
conn->status_code = 200;
if ((pipefd = open(path, O_RDONLY)) < 0) {
syslog(LOG_ERR, "error opening %s", path);
send_http_error(conn, 500, http_500_error,
"open(%s): %s", path, strerror(ERRNO));
return;
}
// set_close_on_exec(pipefd);
gmt_time_string(date, sizeof(date), &curtime);
(void) mg_printf(conn,
"HTTP/1.1 %d %s\r\n"
"Transfer-Encoding: Chunked\r\n"
"Date: %s\r\n"
"Content-Type: %.*s\r\n"
"%s"
"Connection: %s\r\n\r\n",
conn->status_code, msg, date, (int) mime_vec.len,
mime_vec.ptr, encoding, suggest_connection_header(conn));
if (strcmp(conn->request_info.request_method, "HEAD") != 0)
{
if(opt==1) send_pipe_data(conn, pipefd);
else send_pipe_data_gz(conn, pipefd, level);
}
close(pipefd);
}
void mg_send_file(struct mg_connection *conn, const char *path) {
struct file file = STRUCT_FILE_INITIALIZER;
if (mg_stat(conn, path, &file)) {
handle_file_request(conn, path, &file);
} else {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
}
}
void mg_send_pipe(struct mg_connection *conn, const char *path, int opt, int level)
{
struct stat st;
if (stat(path, &st) == 0) {
handle_pipe_request(conn, path, opt, level);
} else {
send_http_error(conn, 404, "Not Found", "%s", "Pipe not found");
}
}
// Parse HTTP headers from the given buffer, advance buffer to the point
// where parsing stopped.
static void parse_http_headers(char **buf, struct mg_request_info *ri) {
int i;
for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
ri->http_headers[i].value = skip(buf, "\r\n");
if (ri->http_headers[i].name[0] == '\0')
break;
ri->num_headers = i + 1;
}
}
static int is_valid_http_method(const char *method) {
return !strcmp(method, "GET") || !strcmp(method, "POST") ||
!strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
!strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
!strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND")
|| !strcmp(method, "MKCOL")
;
}
// Parse HTTP request, fill in mg_request_info structure.
// This function modifies the buffer by NUL-terminating
// HTTP request components, header names and header values.
static int parse_http_message(char *buf, int len, struct mg_request_info *ri) {
int is_request, request_length = get_request_len(buf, len);
if (request_length > 0) {
// Reset attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port
ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL;
ri->num_headers = 0;
buf[request_length - 1] = '\0';
// RFC says that all initial whitespaces should be ingored
while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
buf++;
}
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
// HTTP message could be either HTTP request or HTTP response, e.g.
// "GET / HTTP/1.0 ...." or "HTTP/1.0 200 OK ..."
is_request = is_valid_http_method(ri->request_method);
if ((is_request && memcmp(ri->http_version, "HTTP/", 5) != 0) ||
(!is_request && memcmp(ri->request_method, "HTTP/", 5) != 0)) {
request_length = -1;
} else {
if (is_request) {
ri->http_version += 5;
}
parse_http_headers(&buf, ri);
}
}
return request_length;
}
// Keep reading the input (either opened file descriptor fd, or socket sock,
// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
// buffer (which marks the end of HTTP request). Buffer buf may already
// have some data. The length of the data is stored in nread.
// Upon every read operation, increase nread by the number of bytes read.
static int read_request(FILE *fp, struct mg_connection *conn,
char *buf, int bufsiz, int *nread) {
int request_len, n = 0;
request_len = get_request_len(buf, *nread);
while (conn->ctx->stop_flag == 0 &&
*nread < bufsiz && request_len == 0 &&
(n = pull(fp, conn, buf + *nread, bufsiz - *nread)) > 0) {
*nread += n;
assert(*nread <= bufsiz);
request_len = get_request_len(buf, *nread);
}
return request_len <= 0 && n <= 0 ? -1 : request_len;
}
// For given directory path, substitute it to valid index file.
// Return 0 if index file has been found, -1 if not found.
// If the file is found, it's stats is returned in stp.
static int substitute_index_file(struct mg_connection *conn, char *path,
size_t path_len, struct file *filep) {
const char *list = conn->ctx->config[INDEX_FILES];
struct file file = STRUCT_FILE_INITIALIZER;
struct vec filename_vec;
size_t n = strlen(path);
int found = 0;
// The 'path' given to us points to the directory. Remove all trailing
// directory separator characters from the end of the path, and
// then append single directory separator character.
while (n > 0 && path[n - 1] == '/') {
n--;
}
path[n] = '/';
// Traverse index files list. For each entry, append it to the given
// path and see if the file exists. If it exists, break the loop
while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
// Ignore too long entries that may overflow path buffer
if (filename_vec.len > path_len - (n + 2))
continue;
// Prepare full path to the index file
mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
// Does it exist?
if (mg_stat(conn, path, &file)) {
// Yes it does, break the loop
*filep = file;
found = 1;
break;
}
}
// If no index file exists, restore directory path
if (!found) {
path[n] = '\0';
}
return found;
}
// Return True if we should reply 304 Not Modified.
static int is_not_modified(const struct mg_connection *conn,
const struct file *filep) {
char etag[64];
const char *ims = mg_get_header(conn, "If-Modified-Since");
const char *inm = mg_get_header(conn, "If-None-Match");
construct_etag(etag, sizeof(etag), filep);
return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
(ims != NULL && filep->modification_time <= parse_date_string(ims));
}
static int forward_body_data(struct mg_connection *conn, FILE *fp,
SOCKET sock, SSL *ssl) {
const char *expect, *body;
char buf[MG_BUF_LEN];
int to_read, nread, buffered_len, success = 0;
expect = mg_get_header(conn, "Expect");
assert(fp != NULL);
if (conn->content_len == -1) {
send_http_error(conn, 411, "Length Required", "%s", "");
} else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
send_http_error(conn, 417, "Expectation Failed", "%s", "");
} else {
if (expect != NULL) {
(void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
}
body = conn->buf + conn->request_len + conn->consumed_content;
buffered_len = &conn->buf[conn->data_len] - body;
assert(buffered_len >= 0);
assert(conn->consumed_content == 0);
if (buffered_len > 0) {
if ((int64_t) buffered_len > conn->content_len) {
buffered_len = (int) conn->content_len;
}
push(fp, sock, ssl, body, (int64_t) buffered_len);
conn->consumed_content += buffered_len;
}
nread = 0;
while (conn->consumed_content < conn->content_len) {
to_read = sizeof(buf);
if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
to_read = (int) (conn->content_len - conn->consumed_content);
}
nread = pull(NULL, conn, buf, to_read);
if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
break;
}
conn->consumed_content += nread;
}
if (conn->consumed_content == conn->content_len) {
success = nread >= 0;
}
// Each error code path in this function must send an error
if (!success) {
send_http_error(conn, 577, http_500_error, "%s", "");
}
}
return success;
}
#if !defined(NO_CGI)
// This structure helps to create an environment for the spawned CGI program.
// Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
// last element must be NULL.
// However, on Windows there is a requirement that all these VARIABLE=VALUE\0
// strings must reside in a contiguous buffer. The end of the buffer is
// marked by two '\0' characters.
// We satisfy both worlds: we create an envp array (which is vars), all
// entries are actually pointers inside buf.
struct cgi_env_block {
struct mg_connection *conn;
char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer
int len; // Space taken
char *vars[MAX_CGI_ENVIR_VARS]; // char **envp
int nvars; // Number of variables
};
static char *addenv(struct cgi_env_block *block,
PRINTF_FORMAT_STRING(const char *fmt), ...)
PRINTF_ARGS(2, 3);
// Append VARIABLE=VALUE\0 string to the buffer, and add a respective
// pointer into the vars array.
static char *addenv(struct cgi_env_block *block, const char *fmt, ...) {
int n, space;
char *added;
va_list ap;
// Calculate how much space is left in the buffer
space = sizeof(block->buf) - block->len - 2;
assert(space >= 0);
// Make a pointer to the free space int the buffer
added = block->buf + block->len;
// Copy VARIABLE=VALUE\0 string into the free space
va_start(ap, fmt);
n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap);
va_end(ap);
// Make sure we do not overflow buffer and the envp array
if (n > 0 && n + 1 < space &&
block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
// Append a pointer to the added string into the envp array
block->vars[block->nvars++] = added;
// Bump up used length counter. Include \0 terminator
block->len += n + 1;
} else {
cry(block->conn, "%s: CGI env buffer truncated for [%s]", __func__, fmt);
}
return added;
}
static void prepare_cgi_environment(struct mg_connection *conn,
const char *prog,
struct cgi_env_block *blk) {
const struct mg_request_info *ri = &conn->request_info;
const char *s, *slash;
struct vec var_vec;
char *p, src_addr[IP_ADDR_STR_LEN];
int i;
blk->len = blk->nvars = 0;
blk->conn = conn;
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]);
addenv(blk, "SERVER_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(blk, "DOCUMENT_ROOT=%s", conn->ctx->config[DOCUMENT_ROOT]);
addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", mg_version());
// Prepare the environment block
addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP
// TODO(lsm): fix this for IPv6 case
addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.sin.sin_port));
addenv(blk, "REQUEST_METHOD=%s", ri->request_method);
addenv(blk, "REMOTE_ADDR=%s", src_addr);
addenv(blk, "REMOTE_PORT=%d", ri->remote_port);
addenv(blk, "REQUEST_URI=%s%s%s", ri->uri,
ri->query_string == NULL ? "" : "?",
ri->query_string == NULL ? "" : ri->query_string);
// SCRIPT_NAME
if (conn->path_info != NULL) {
addenv(blk, "SCRIPT_NAME=%.*s",
(int) (strlen(ri->uri) - strlen(conn->path_info)), ri->uri);
addenv(blk, "PATH_INFO=%s", conn->path_info);
} else {
s = strrchr(prog, '/');
slash = strrchr(ri->uri, '/');
addenv(blk, "SCRIPT_NAME=%.*s%s",
slash == NULL ? 0 : (int) (slash - ri->uri), ri->uri,
s == NULL ? prog : s);
}
addenv(blk, "SCRIPT_FILENAME=%s", prog);
addenv(blk, "PATH_TRANSLATED=%s", prog);
addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on");
if ((s = mg_get_header(conn, "Content-Type")) != NULL)
addenv(blk, "CONTENT_TYPE=%s", s);
if (ri->query_string != NULL) {
addenv(blk, "QUERY_STRING=%s", ri->query_string);
}
if ((s = mg_get_header(conn, "Content-Length")) != NULL)
addenv(blk, "CONTENT_LENGTH=%s", s);
if ((s = getenv("PATH")) != NULL)
addenv(blk, "PATH=%s", s);
#if defined(_WIN32)
if ((s = getenv("COMSPEC")) != NULL) {
addenv(blk, "COMSPEC=%s", s);
}
if ((s = getenv("SYSTEMROOT")) != NULL) {
addenv(blk, "SYSTEMROOT=%s", s);
}
if ((s = getenv("SystemDrive")) != NULL) {
addenv(blk, "SystemDrive=%s", s);
}
if ((s = getenv("ProgramFiles")) != NULL) {
addenv(blk, "ProgramFiles=%s", s);
}
if ((s = getenv("ProgramFiles(x86)")) != NULL) {
addenv(blk, "ProgramFiles(x86)=%s", s);
}
if ((s = getenv("CommonProgramFiles(x86)")) != NULL) {
addenv(blk, "CommonProgramFiles(x86)=%s", s);
}
#else
if ((s = getenv("LD_LIBRARY_PATH")) != NULL)
addenv(blk, "LD_LIBRARY_PATH=%s", s);
#endif // _WIN32
if ((s = getenv("PERLLIB")) != NULL)
addenv(blk, "PERLLIB=%s", s);
if (ri->remote_user != NULL) {
addenv(blk, "REMOTE_USER=%s", ri->remote_user);
addenv(blk, "%s", "AUTH_TYPE=Digest");
}
// Add all headers as HTTP_* variables
for (i = 0; i < ri->num_headers; i++) {
p = addenv(blk, "HTTP_%s=%s",
ri->http_headers[i].name, ri->http_headers[i].value);
// Convert variable name into uppercase, and change - to _
for (; *p != '=' && *p != '\0'; p++) {
if (*p == '-')
*p = '_';
*p = (char) toupper(* (unsigned char *) p);
}
}
// Add user-specified variables
s = conn->ctx->config[CGI_ENVIRONMENT];
while ((s = next_option(s, &var_vec, NULL)) != NULL) {
addenv(blk, "%.*s", (int) var_vec.len, var_vec.ptr);
}
blk->vars[blk->nvars++] = NULL;
blk->buf[blk->len++] = '\0';
assert(blk->nvars < (int) ARRAY_SIZE(blk->vars));
assert(blk->len > 0);
assert(blk->len < (int) sizeof(blk->buf));
}
static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
int headers_len, data_len, i, fdin[2], fdout[2];
const char *status, *status_text;
char buf[16384], *pbuf, dir[PATH_MAX], *p;
struct mg_request_info ri;
struct cgi_env_block blk;
FILE *in = NULL, *out = NULL;
struct file fout = STRUCT_FILE_INITIALIZER;
pid_t pid = (pid_t) -1;
prepare_cgi_environment(conn, prog, &blk);
// CGI must be executed in its own directory. 'dir' must point to the
// directory containing executable program, 'p' must point to the
// executable program name relative to 'dir'.
(void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog);
if ((p = strrchr(dir, '/')) != NULL) {
*p++ = '\0';
} else {
dir[0] = '.', dir[1] = '\0';
p = (char *) prog;
}
if (pipe(fdin) != 0 || pipe(fdout) != 0) {
send_http_error(conn, 500, http_500_error,
"Cannot create CGI pipe: %s", strerror(ERRNO));
goto done;
}
pid = spawn_process(conn, p, blk.buf, blk.vars, fdin[0], fdout[1], dir);
if (pid == (pid_t) -1) {
send_http_error(conn, 500, http_500_error,
"Cannot spawn CGI process [%s]: %s", prog, strerror(ERRNO));
goto done;
}
// Make sure child closes all pipe descriptors. It must dup them to 0,1
set_close_on_exec(fdin[0]);
set_close_on_exec(fdin[1]);
set_close_on_exec(fdout[0]);
set_close_on_exec(fdout[1]);
// Parent closes only one side of the pipes.
// If we don't mark them as closed, close() attempt before
// return from this function throws an exception on Windows.
// Windows does not like when closed descriptor is closed again.
(void) close(fdin[0]);
(void) close(fdout[1]);
fdin[0] = fdout[1] = -1;
if ((in = fdopen(fdin[1], "wb")) == NULL ||
(out = fdopen(fdout[0], "rb")) == NULL) {
send_http_error(conn, 500, http_500_error,
"fopen: %s", strerror(ERRNO));
goto done;
}
setbuf(in, NULL);
setbuf(out, NULL);
fout.fp = out;
// Send POST data to the CGI process if needed
if (!strcmp(conn->request_info.request_method, "POST") &&
!forward_body_data(conn, in, INVALID_SOCKET, NULL)) {
goto done;
}
// Close so child gets an EOF.
fclose(in);
in = NULL;
fdin[1] = -1;
// Now read CGI reply into a buffer. We need to set correct
// status code, thus we need to see all HTTP headers first.
// Do not send anything back to client, until we buffer in all
// HTTP headers.
data_len = 0;
headers_len = read_request(out, conn, buf, sizeof(buf), &data_len);
if (headers_len <= 0) {
send_http_error(conn, 500, http_500_error,
"CGI program sent malformed or too big (>%u bytes) "
"HTTP headers: [%.*s]",
(unsigned) sizeof(buf), data_len, buf);
goto done;
}
pbuf = buf;
buf[headers_len - 1] = '\0';
parse_http_headers(&pbuf, &ri);
// Make up and send the status line
status_text = "OK";
if ((status = get_header(&ri, "Status")) != NULL) {
conn->status_code = atoi(status);
status_text = status;
while (isdigit(* (unsigned char *) status_text) || *status_text == ' ') {
status_text++;
}
} else if (get_header(&ri, "Location") != NULL) {
conn->status_code = 302;
} else {
conn->status_code = 200;
}
if (get_header(&ri, "Connection") != NULL &&
!mg_strcasecmp(get_header(&ri, "Connection"), "keep-alive")) {
conn->must_close = 1;
}
(void) mg_printf(conn, "HTTP/1.1 %d %s\r\n", conn->status_code,
status_text);
// Send headers
for (i = 0; i < ri.num_headers; i++) {
mg_printf(conn, "%s: %s\r\n",
ri.http_headers[i].name, ri.http_headers[i].value);
}
mg_write(conn, "\r\n", 2);
// Send chunk of data that may have been read after the headers
conn->num_bytes_sent += mg_write(conn, buf + headers_len,
(size_t)(data_len - headers_len));
// Read the rest of CGI output and send to the client
send_file_data(conn, &fout, 0, INT64_MAX);
done:
if (pid != (pid_t) -1) {
kill(pid, SIGKILL);
}
if (fdin[0] != -1) {
close(fdin[0]);
}
if (fdout[1] != -1) {
close(fdout[1]);
}
if (in != NULL) {
fclose(in);
} else if (fdin[1] != -1) {
close(fdin[1]);
}
if (out != NULL) {
fclose(out);
} else if (fdout[0] != -1) {
close(fdout[0]);
}
}
#endif // !NO_CGI
// For a given PUT path, create all intermediate subdirectories
// for given path. Return 0 if the path itself is a directory,
// or -1 on error, 1 if OK.
static int put_dir(struct mg_connection *conn, const char *path) {
char buf[PATH_MAX];
const char *s, *p;
struct file file = STRUCT_FILE_INITIALIZER;
int len, res = 1;
for (s = p = path + 2; (p = strchr(s, '/')) != NULL; s = ++p) {
len = p - path;
if (len >= (int) sizeof(buf)) {
res = -1;
break;
}
memcpy(buf, path, len);
buf[len] = '\0';
// Try to create intermediate directory
DEBUG_TRACE(("mkdir(%s)", buf));
if (!mg_stat(conn, buf, &file) && mg_mkdir(buf, 0755) != 0) {
res = -1;
break;
}
// Is path itself a directory?
if (p[1] == '\0') {
res = 0;
}
}
return res;
}
static void mkcol(struct mg_connection *conn, const char *path) {
int rc, body_len;
struct de de;
memset(&de.file, 0, sizeof(de.file));
mg_stat(conn, path, &de.file);
if(de.file.modification_time) {
send_http_error(conn, 405, "Method Not Allowed",
"mkcol(%s): %s", path, strerror(ERRNO));
return;
}
body_len = conn->data_len - conn->request_len;
if(body_len > 0) {
send_http_error(conn, 415, "Unsupported media type",
"mkcol(%s): %s", path, strerror(ERRNO));
return;
}
rc = mg_mkdir(path, 0755);
if (rc == 0) {
conn->status_code = 201;
mg_printf(conn, "HTTP/1.1 %d Created\r\n\r\n", conn->status_code);
} else if (rc == -1) {
if(errno == EEXIST)
send_http_error(conn, 405, "Method Not Allowed",
"mkcol(%s): %s", path, strerror(ERRNO));
else if(errno == EACCES)
send_http_error(conn, 403, "Forbidden",
"mkcol(%s): %s", path, strerror(ERRNO));
else if(errno == ENOENT)
send_http_error(conn, 409, "Conflict",
"mkcol(%s): %s", path, strerror(ERRNO));
else
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
}
}
static void put_file(struct mg_connection *conn, const char *path) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *range;
int64_t r1, r2;
int rc;
conn->status_code = mg_stat(conn, path, &file) ? 200 : 201;
if ((rc = put_dir(conn, path)) == 0) {
mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->status_code);
} else if (rc == -1) {
send_http_error(conn, 500, http_500_error,
"put_dir(%s): %s", path, strerror(ERRNO));
} else if (!mg_fopen(conn, path, "wb+", &file) || file.fp == NULL) {
mg_fclose(&file);
send_http_error(conn, 500, http_500_error,
"fopen(%s): %s", path, strerror(ERRNO));
} else {
fclose_on_exec(&file);
range = mg_get_header(conn, "Content-Range");
r1 = r2 = 0;
if (range != NULL && parse_range_header(range, &r1, &r2) > 0) {
conn->status_code = 206;
fseeko(file.fp, r1, SEEK_SET);
}
if (!forward_body_data(conn, file.fp, INVALID_SOCKET, NULL)) {
conn->status_code = 500;
}
mg_printf(conn, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n",
conn->status_code);
mg_fclose(&file);
}
}
static void send_ssi_file(struct mg_connection *, const char *,
struct file *, int);
static void do_ssi_include(struct mg_connection *conn, const char *ssi,
char *tag, int include_level) {
char file_name[MG_BUF_LEN], path[PATH_MAX], *p;
struct file file = STRUCT_FILE_INITIALIZER;
// sscanf() is safe here, since send_ssi_file() also uses buffer
// of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver root
(void) mg_snprintf(conn, path, sizeof(path), "%s%c%s",
conn->ctx->config[DOCUMENT_ROOT], '/', file_name);
} else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
// File name is relative to the webserver working directory
// or it is absolute system path
(void) mg_snprintf(conn, path, sizeof(path), "%s", file_name);
} else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
// File name is relative to the currect document
(void) mg_snprintf(conn, path, sizeof(path), "%s", ssi);
if ((p = strrchr(path, '/')) != NULL) {
p[1] = '\0';
}
(void) mg_snprintf(conn, path + strlen(path),
sizeof(path) - strlen(path), "%s", file_name);
} else {
cry(conn, "Bad SSI #include: [%s]", tag);
return;
}
if (!mg_fopen(conn, path, "rb", &file)) {
cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s",
tag, path, strerror(ERRNO));
} else {
fclose_on_exec(&file);
if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]), path) > 0) {
send_ssi_file(conn, path, &file, include_level + 1);
} else {
send_file_data(conn, &file, 0, INT64_MAX);
}
mg_fclose(&file);
}
}
#if !defined(NO_POPEN)
static void do_ssi_exec(struct mg_connection *conn, char *tag) {
char cmd[MG_BUF_LEN];
struct file file = STRUCT_FILE_INITIALIZER;
if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
cry(conn, "Bad SSI #exec: [%s]", tag);
} else if ((file.fp = popen(cmd, "r")) == NULL) {
cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO));
} else {
send_file_data(conn, &file, 0, INT64_MAX);
pclose(file.fp);
}
}
#endif // !NO_POPEN
static int mg_fgetc(struct file *filep, int offset) {
if (filep->membuf != NULL && offset >=0 && offset < filep->size) {
return ((unsigned char *) filep->membuf)[offset];
} else if (filep->fp != NULL) {
return fgetc(filep->fp);
} else {
return EOF;
}
}
static void send_ssi_file(struct mg_connection *conn, const char *path,
struct file *filep, int include_level) {
char buf[MG_BUF_LEN];
int ch, offset, len, in_ssi_tag;
if (include_level > 10) {
cry(conn, "SSI #include level is too deep (%s)", path);
return;
}
in_ssi_tag = len = offset = 0;
while ((ch = mg_fgetc(filep, offset)) != EOF) {
if (in_ssi_tag && ch == '>') {
in_ssi_tag = 0;
buf[len++] = (char) ch;
buf[len] = '\0';
assert(len <= (int) sizeof(buf));
if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
// Not an SSI tag, pass it
(void) mg_write(conn, buf, (size_t) len);
} else {
if (!memcmp(buf + 5, "include", 7)) {
do_ssi_include(conn, path, buf + 12, include_level);
#if !defined(NO_POPEN)
} else if (!memcmp(buf + 5, "exec", 4)) {
do_ssi_exec(conn, buf + 9);
#endif // !NO_POPEN
} else {
cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf);
}
}
len = 0;
} else if (in_ssi_tag) {
if (len == 5 && memcmp(buf, "<!--#", 5) != 0) {
// Not an SSI tag
in_ssi_tag = 0;
} else if (len == (int) sizeof(buf) - 2) {
cry(conn, "%s: SSI tag is too large", path);
len = 0;
}
buf[len++] = ch & 0xff;
} else if (ch == '<') {
in_ssi_tag = 1;
if (len > 0) {
mg_write(conn, buf, (size_t) len);
}
len = 0;
buf[len++] = ch & 0xff;
} else {
buf[len++] = ch & 0xff;
if (len == (int) sizeof(buf)) {
mg_write(conn, buf, (size_t) len);
len = 0;
}
}
}
// Send the rest of buffered data
if (len > 0) {
mg_write(conn, buf, (size_t) len);
}
}
static void handle_ssi_file_request(struct mg_connection *conn,
const char *path) {
struct file file = STRUCT_FILE_INITIALIZER;
struct vec mime_vec;
if (!mg_fopen(conn, path, "rb", &file)) {
send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path,
strerror(ERRNO));
} else {
conn->must_close = 1;
fclose_on_exec(&file);
get_mime_type(conn->ctx, path, &mime_vec);
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Type: %.*s\r\n"
"Connection: close\r\n\r\n",
(int) mime_vec.len, mime_vec.ptr);
send_ssi_file(conn, path, &file, 0);
mg_fclose(&file);
}
}
static void send_options(struct mg_connection *conn) {
conn->status_code = 200;
mg_printf(conn, "%s", "HTTP/1.1 200 OK\r\n"
"Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, "
"OPTIONS, PROPFIND, MKCOL\r\n"
"DAV: 1\r\n\r\n");
}
// Writes PROPFIND properties for a collection element
static void print_props(struct mg_connection *conn, const char* uri,
struct file *filep) {
char mtime[64];
gmt_time_string(mtime, sizeof(mtime), &filep->modification_time);
conn->num_bytes_sent += mg_printf(conn,
"<d:response>"
"<d:href>%s</d:href>"
"<d:propstat>"
"<d:prop>"
"<d:resourcetype>%s</d:resourcetype>"
"<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>"
"<d:getlastmodified>%s</d:getlastmodified>"
"</d:prop>"
"<d:status>HTTP/1.1 200 OK</d:status>"
"</d:propstat>"
"</d:response>\n",
uri,
filep->is_directory ? "<d:collection/>" : "",
filep->size,
mtime);
}
static void print_dav_dir_entry(struct de *de, void *data) {
char href[PATH_MAX];
char href_encoded[PATH_MAX];
struct mg_connection *conn = (struct mg_connection *) data;
mg_snprintf(conn, href, sizeof(href), "%s%s",
conn->request_info.uri, de->file_name);
mg_url_encode(href, href_encoded, PATH_MAX-1);
print_props(conn, href_encoded, &de->file);
}
static void handle_propfind(struct mg_connection *conn, const char *path,
struct file *filep) {
const char *depth = mg_get_header(conn, "Depth");
conn->must_close = 1;
conn->status_code = 207;
mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n"
"Connection: close\r\n"
"Content-Type: text/xml; charset=utf-8\r\n\r\n");
conn->num_bytes_sent += mg_printf(conn,
"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<d:multistatus xmlns:d='DAV:'>\n");
// Print properties for the requested resource itself
print_props(conn, conn->request_info.uri, filep);
// If it is a directory, print directory entries too if Depth is not 0
if (filep->is_directory &&
!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") &&
(depth == NULL || strcmp(depth, "0") != 0)) {
scan_directory(conn, path, conn, &print_dav_dir_entry);
}
conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>");
}
#if defined(USE_WEBSOCKET)
// START OF SHA-1 code
// Copyright(c) By Steve Reid <steve@edmweb.com>
#define SHA1HANDSOFF
#if defined(__sun)
#include "solarisfixes.h"
#endif
union char64long16 { unsigned char c[64]; uint32_t l[16]; };
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
static uint32_t blk0(union char64long16 *block, int i) {
// Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN
if (!is_big_endian()) {
block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) |
(rol(block->l[i], 8) & 0x00FF00FF);
}
return block->l[i];
}
#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
^block->l[(i+2)&15]^block->l[i&15],1))
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(block, i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
typedef struct {
uint32_t state[5];
uint32_t count[2];
unsigned char buffer[64];
} SHA1_CTX;
static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) {
uint32_t a, b, c, d, e;
union char64long16 block[1];
memcpy(block, buffer, 64);
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
a = b = c = d = e = 0;
memset(block, '\0', sizeof(block));
}
static void SHA1Init(SHA1_CTX* context) {
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
context->state[4] = 0xC3D2E1F0;
context->count[0] = context->count[1] = 0;
}
static void SHA1Update(SHA1_CTX* context, const unsigned char* data,
uint32_t len) {
uint32_t i, j;
j = context->count[0];
if ((context->count[0] += len << 3) < j)
context->count[1]++;
context->count[1] += (len>>29);
j = (j >> 3) & 63;
if ((j + len) > 63) {
memcpy(&context->buffer[j], data, (i = 64-j));
SHA1Transform(context->state, context->buffer);
for ( ; i + 63 < len; i += 64) {
SHA1Transform(context->state, &data[i]);
}
j = 0;
}
else i = 0;
memcpy(&context->buffer[j], &data[i], len - i);
}
static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
unsigned i;
unsigned char finalcount[8], c;
for (i = 0; i < 8; i++) {
finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
>> ((3-(i & 3)) * 8) ) & 255);
}
c = 0200;
SHA1Update(context, &c, 1);
while ((context->count[0] & 504) != 448) {
c = 0000;
SHA1Update(context, &c, 1);
}
SHA1Update(context, finalcount, 8);
for (i = 0; i < 20; i++) {
digest[i] = (unsigned char)
((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
}
memset(context, '\0', sizeof(*context));
memset(&finalcount, '\0', sizeof(finalcount));
}
// END OF SHA1 CODE
static void base64_encode(const unsigned char *src, int src_len, char *dst) {
static const char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int i, j, a, b, c;
for (i = j = 0; i < src_len; i += 3) {
a = src[i];
b = i + 1 >= src_len ? 0 : src[i + 1];
c = i + 2 >= src_len ? 0 : src[i + 2];
dst[j++] = b64[a >> 2];
dst[j++] = b64[((a & 3) << 4) | (b >> 4)];
if (i + 1 < src_len) {
dst[j++] = b64[(b & 15) << 2 | (c >> 6)];
}
if (i + 2 < src_len) {
dst[j++] = b64[c & 63];
}
}
while (j % 4 != 0) {
dst[j++] = '=';
}
dst[j++] = '\0';
}
static void send_websocket_handshake(struct mg_connection *conn) {
static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
char buf[100], sha[20], b64_sha[sizeof(sha) * 2];
SHA1_CTX sha_ctx;
mg_snprintf(conn, buf, sizeof(buf), "%s%s",
mg_get_header(conn, "Sec-WebSocket-Key"), magic);
SHA1Init(&sha_ctx);
SHA1Update(&sha_ctx, (unsigned char *) buf, strlen(buf));
SHA1Final((unsigned char *) sha, &sha_ctx);
base64_encode((unsigned char *) sha, sizeof(sha), b64_sha);
mg_printf(conn, "%s%s%s",
"HTTP/1.1 101 Switching Protocols\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Accept: ", b64_sha, "\r\n\r\n");
}
static void read_websocket(struct mg_connection *conn) {
// Pointer to the beginning of the portion of the incoming websocket message
// queue. The original websocket upgrade request is never removed,
// so the queue begins after it.
unsigned char *buf = (unsigned char *) conn->buf + conn->request_len;
int bits, n, stop = 0;
size_t i, len, mask_len, data_len, header_len, body_len;
// data points to the place where the message is stored when passed to the
// websocket_data callback. This is either mem on the stack,
// or a dynamically allocated buffer if it is too large.
char mem[4 * 1024], mask[4], *data;
assert(conn->content_len == 0);
// Loop continuously, reading messages from the socket, invoking the callback,
// and waiting repeatedly until an error occurs.
while (!stop) {
header_len = 0;
// body_len is the length of the entire queue in bytes
// len is the length of the current message
// data_len is the length of the current message's data payload
// header_len is the length of the current message's header
if ((body_len = conn->data_len - conn->request_len) >= 2) {
len = buf[1] & 127;
mask_len = buf[1] & 128 ? 4 : 0;
if (len < 126 && body_len >= mask_len) {
data_len = len;
header_len = 2 + mask_len;
} else if (len == 126 && body_len >= 4 + mask_len) {
header_len = 4 + mask_len;
data_len = ((((int) buf[2]) << 8) + buf[3]);
} else if (body_len >= 10 + mask_len) {
header_len = 10 + mask_len;
data_len = (((uint64_t) htonl(* (uint32_t *) &buf[2])) << 32) +
htonl(* (uint32_t *) &buf[6]);
}
}
// Data layout is as follows:
// conn->buf buf
// v v frame1 | frame2
// |---------------------|----------------|--------------|-------
// | |<--header_len-->|<--data_len-->|
// |<-conn->request_len->|<-----body_len----------->|
// |<-------------------conn->data_len------------->|
if (header_len > 0) {
// Allocate space to hold websocket payload
data = mem;
if (data_len > sizeof(mem) && (data = malloc(data_len)) == NULL) {
// Allocation failed, exit the loop and then close the connection
// TODO: notify user about the failure
break;
}
// Save mask and bits, otherwise it may be clobbered by memmove below
bits = buf[0];
memcpy(mask, buf + header_len - mask_len, mask_len);
// Read frame payload into the allocated buffer.
assert(body_len >= header_len);
if (data_len + header_len > body_len) {
len = body_len - header_len;
memcpy(data, buf + header_len, len);
// TODO: handle pull error
pull_all(NULL, conn, data + len, data_len - len);
conn->data_len = conn->request_len;
} else {
len = data_len + header_len;
memcpy(data, buf + header_len, data_len);
memmove(buf, buf + len, body_len - len);
conn->data_len -= len;
}
// Apply mask if necessary
if (mask_len > 0) {
for (i = 0; i < data_len; i++) {
data[i] ^= mask[i % 4];
}
}
// Exit the loop if callback signalled to exit,
// or "connection close" opcode received.
if ((bits & WEBSOCKET_OPCODE_CONNECTION_CLOSE) ||
(conn->ctx->callbacks.websocket_data != NULL &&
!conn->ctx->callbacks.websocket_data(conn, bits, data, data_len))) {
stop = 1;
}
if (data != mem) {
free(data);
}
// Not breaking the loop, process next websocket frame.
} else {
// Buffering websocket request
if ((n = pull(NULL, conn, conn->buf + conn->data_len,
conn->buf_size - conn->data_len)) <= 0) {
break;
}
conn->data_len += n;
}
}
}
int mg_websocket_write(struct mg_connection* conn, int opcode,
const char *data, size_t data_len) {
unsigned char *copy;
size_t copy_len = 0;
int retval = -1;
if ((copy = (unsigned char *) malloc(data_len + 10)) == NULL) {
return -1;
}
copy[0] = 0x80 + (opcode & 0x0f);
// Frame format: http://tools.ietf.org/html/rfc6455#section-5.2
if (data_len < 126) {
// Inline 7-bit length field
copy[1] = data_len;
memcpy(copy + 2, data, data_len);
copy_len = 2 + data_len;
} else if (data_len <= 0xFFFF) {
// 16-bit length field
copy[1] = 126;
* (uint16_t *) (copy + 2) = htons(data_len);
memcpy(copy + 4, data, data_len);
copy_len = 4 + data_len;
} else {
// 64-bit length field
copy[1] = 127;
* (uint32_t *) (copy + 2) = htonl((uint64_t) data_len >> 32);
* (uint32_t *) (copy + 6) = htonl(data_len & 0xffffffff);
memcpy(copy + 10, data, data_len);
copy_len = 10 + data_len;
}
// Not thread safe
if (copy_len > 0) {
retval = mg_write(conn, copy, copy_len);
}
free(copy);
return retval;
}
static void handle_websocket_request(struct mg_connection *conn) {
const char *version = mg_get_header(conn, "Sec-WebSocket-Version");
if (version == NULL || strcmp(version, "13") != 0) {
send_http_error(conn, 426, "Upgrade Required", "%s", "Upgrade Required");
} else if (conn->ctx->callbacks.websocket_connect != NULL &&
conn->ctx->callbacks.websocket_connect(conn) != 0) {
// Callback has returned non-zero, do not proceed with handshake
} else {
send_websocket_handshake(conn);
if (conn->ctx->callbacks.websocket_ready != NULL) {
conn->ctx->callbacks.websocket_ready(conn);
}
read_websocket(conn);
}
}
static int is_websocket_request(const struct mg_connection *conn) {
const char *host, *upgrade, *connection, *version, *key;
host = mg_get_header(conn, "Host");
upgrade = mg_get_header(conn, "Upgrade");
connection = mg_get_header(conn, "Connection");
key = mg_get_header(conn, "Sec-WebSocket-Key");
version = mg_get_header(conn, "Sec-WebSocket-Version");
return host != NULL && upgrade != NULL && connection != NULL &&
key != NULL && version != NULL &&
mg_strcasestr(upgrade, "websocket") != NULL &&
mg_strcasestr(connection, "Upgrade") != NULL;
}
#endif // !USE_WEBSOCKET
static int isbyte(int n) {
return n >= 0 && n <= 255;
}
static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
int n, a, b, c, d, slash = 32, len = 0;
if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) &&
slash >= 0 && slash < 33) {
len = n;
*net = ((uint32_t)a << 24) | ((uint32_t)b << 16) | ((uint32_t)c << 8) | d;
*mask = slash ? 0xffffffffU << (32 - slash) : 0;
}
return len;
}
static int set_throttle(const char *spec, uint32_t remote_ip, const char *uri) {
int throttle = 0;
struct vec vec, val;
uint32_t net, mask;
char mult;
double v;
while ((spec = next_option(spec, &vec, &val)) != NULL) {
mult = ',';
if (sscanf(val.ptr, "%lf%c", &v, &mult) < 1 || v < 0 ||
(lowercase(&mult) != 'k' && lowercase(&mult) != 'm' && mult != ',')) {
continue;
}
v *= lowercase(&mult) == 'k' ? 1024 : lowercase(&mult) == 'm' ? 1048576 : 1;
if (vec.len == 1 && vec.ptr[0] == '*') {
throttle = (int) v;
} else if (parse_net(vec.ptr, &net, &mask) > 0) {
if ((remote_ip & mask) == net) {
throttle = (int) v;
}
} else if (match_prefix(vec.ptr, vec.len, uri) > 0) {
throttle = (int) v;
}
}
return throttle;
}
static uint32_t get_remote_ip(const struct mg_connection *conn) {
return ntohl(* (uint32_t *) &conn->client.rsa.sin.sin_addr);
}
#ifdef USE_LUA
#include "build/mod_lua.c"
#endif // USE_LUA
int
mg_append(struct mg_connection *conn, char *filename)
{
const char *content_type_header, *boundary_start;
char buf[8192], path[PATH_MAX], fname[1024], boundary[100];
FILE *fp;
int bl, n, i, j, headers_len, boundary_len, len = 0, num_uploaded_files = 0;
// Request looks like this:
//
// POST /upload HTTP/1.1
// Host: 127.0.0.1:8080
// Content-Length: 244894
// Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
//
// ------WebKitFormBoundaryRVr
// Content-Disposition: form-data; name="file"; filename="accum.png"
// Content-Type: image/png
//
// <89>PNG
// <PNG DATA>
// ------WebKitFormBoundaryRVr
// Extract boundary string from the Content-Type header
if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
(boundary_start = strstr(content_type_header, "boundary=")) == NULL ||
(sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
boundary[0] == '\0') {
return num_uploaded_files;
}
boundary_len = strlen(boundary);
bl = boundary_len + 4; // \r\n--<boundary>
for (;;) {
// Pull in headers
assert(len >= 0 && len <= (int) sizeof(buf));
while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
len += n;
}
if ((headers_len = get_request_len(buf, len)) <= 0) {
break;
}
// Fetch file name.
fname[0] = '\0';
for (i = j = 0; i < headers_len; i++) {
if (buf[i] == '\r' && buf[i + 1] == '\n') {
buf[i] = buf[i + 1] = '\0';
// TODO(lsm): don't expect filename to be the 3rd field,
// parse the header properly instead.
sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
fname);
j = i + 2;
}
}
// Give up if the headers are not what we expect
if (fname[0] == '\0') {
break;
}
// Move data to the beginning of the buffer
assert(len >= headers_len);
memmove(buf, &buf[headers_len], len - headers_len);
len -= headers_len;
// We open the file with exclusive lock held. This guarantee us
// there is no other thread can save into the same file simultaneously.
fp = NULL;
// Open file in binary mode for appending.
umask(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if ((fp = fopen(filename, "a+b")) == NULL) {
break;
}
// Read POST data, write into file until boundary is found.
n = 0;
do {
len += n;
for (i = 0; i < len - bl; i++) {
if (!memcmp(&buf[i], "\r\n--", 4) &&
!memcmp(&buf[i + 4], boundary, boundary_len)) {
// Found boundary, that's the end of file data.
fwrite(buf, 1, i, fp);
fflush(fp);
num_uploaded_files++;
// conn->request_info.ev_data = (void *) path;
// call_user(conn, MG_UPLOAD);
if (conn->ctx->callbacks.upload != NULL) {
conn->ctx->callbacks.upload(conn, path);
}
memmove(buf, &buf[i + bl], len - (i + bl));
len -= i + bl;
break;
}
}
if (len > bl) {
fwrite(buf, 1, len - bl, fp);
memmove(buf, &buf[len - bl], len - bl);
len = bl;
}
} while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
fclose(fp);
}
return num_uploaded_files;
}
int mg_upload(struct mg_connection *conn, const char *destination_dir) {
const char *content_type_header, *boundary_start;
char buf[MG_BUF_LEN], path[PATH_MAX], fname[1024], boundary[100], *s;
FILE *fp;
int bl, n, i, j, headers_len, boundary_len, eof,
len = 0, num_uploaded_files = 0;
// Request looks like this:
//
// POST /upload HTTP/1.1
// Host: 127.0.0.1:8080
// Content-Length: 244894
// Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryRVr
//
// ------WebKitFormBoundaryRVr
// Content-Disposition: form-data; name="file"; filename="accum.png"
// Content-Type: image/png
//
// <89>PNG
// <PNG DATA>
// ------WebKitFormBoundaryRVr
// Extract boundary string from the Content-Type header
if ((content_type_header = mg_get_header(conn, "Content-Type")) == NULL ||
(boundary_start = mg_strcasestr(content_type_header,
"boundary=")) == NULL ||
(sscanf(boundary_start, "boundary=\"%99[^\"]\"", boundary) == 0 &&
sscanf(boundary_start, "boundary=%99s", boundary) == 0) ||
boundary[0] == '\0') {
return num_uploaded_files;
}
boundary_len = strlen(boundary);
bl = boundary_len + 4; // \r\n--<boundary>
for (;;) {
// Pull in headers
assert(len >= 0 && len <= (int) sizeof(buf));
while ((n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0) {
len += n;
}
if ((headers_len = get_request_len(buf, len)) <= 0) {
break;
}
// Fetch file name.
fname[0] = '\0';
for (i = j = 0; i < headers_len; i++) {
if (buf[i] == '\r' && buf[i + 1] == '\n') {
buf[i] = buf[i + 1] = '\0';
// TODO(lsm): don't expect filename to be the 3rd field,
// parse the header properly instead.
sscanf(&buf[j], "Content-Disposition: %*s %*s filename=\"%1023[^\"]",
fname);
j = i + 2;
}
}
// Give up if the headers are not what we expect
if (fname[0] == '\0') {
break;
}
// Move data to the beginning of the buffer
assert(len >= headers_len);
memmove(buf, &buf[headers_len], len - headers_len);
len -= headers_len;
// We open the file with exclusive lock held. This guarantee us
// there is no other thread can save into the same file simultaneously.
fp = NULL;
// Construct destination file name. Do not allow paths to have slashes.
if ((s = strrchr(fname, '/')) == NULL &&
(s = strrchr(fname, '\\')) == NULL) {
s = fname;
}
// Open file in binary mode. TODO: set an exclusive lock.
snprintf(path, sizeof(path), "%s/%s", destination_dir, s);
if ((fp = fopen(path, "wb")) == NULL) {
break;
}
// Read POST data, write into file until boundary is found.
eof = n = 0;
do {
len += n;
for (i = 0; i < len - bl; i++) {
if (!memcmp(&buf[i], "\r\n--", 4) &&
!memcmp(&buf[i + 4], boundary, boundary_len)) {
// Found boundary, that's the end of file data.
fwrite(buf, 1, i, fp);
eof = 1;
memmove(buf, &buf[i + bl], len - (i + bl));
len -= i + bl;
break;
}
}
if (!eof && len > bl) {
fwrite(buf, 1, len - bl, fp);
memmove(buf, &buf[len - bl], bl);
len = bl;
}
} while (!eof && (n = mg_read(conn, buf + len, sizeof(buf) - len)) > 0);
fclose(fp);
if (eof) {
num_uploaded_files++;
if (conn->ctx->callbacks.upload != NULL) {
conn->ctx->callbacks.upload(conn, path);
}
}
}
return num_uploaded_files;
}
static int is_put_or_delete_request(const struct mg_connection *conn) {
const char *s = conn->request_info.request_method;
return s != NULL && (!strcmp(s, "PUT") ||
!strcmp(s, "DELETE") ||
!strcmp(s, "MKCOL"));
}
static int get_first_ssl_listener_index(const struct mg_context *ctx) {
int i, index = -1;
for (i = 0; index == -1 && i < ctx->num_listening_sockets; i++) {
index = ctx->listening_sockets[i].is_ssl ? i : -1;
}
return index;
}
static void redirect_to_https_port(struct mg_connection *conn, int ssl_index) {
char host[1025];
const char *host_header;
if ((host_header = mg_get_header(conn, "Host")) == NULL ||
sscanf(host_header, "%1024[^:]", host) == 0) {
// Cannot get host from the Host: header. Fallback to our IP address.
sockaddr_to_string(host, sizeof(host), &conn->client.lsa);
}
mg_printf(conn, "HTTP/1.1 302 Found\r\nLocation: https://%s:%d%s\r\n\r\n",
host, (int) ntohs(conn->ctx->listening_sockets[ssl_index].
lsa.sin.sin_port), conn->request_info.uri);
}
// This is the heart of the Mongoose's logic.
// This function is called when the request is read, parsed and validated,
// and Mongoose must decide what action to take: serve a file, or
// a directory, or call embedded function, etcetera.
static void handle_request(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
char path[PATH_MAX];
int uri_len, ssl_index;
struct file file = STRUCT_FILE_INITIALIZER;
if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) {
* ((char *) conn->request_info.query_string++) = '\0';
}
uri_len = (int) strlen(ri->uri);
mg_url_decode(ri->uri, uri_len, (char *) ri->uri, uri_len + 1, 0);
remove_double_dots_and_double_slashes((char *) ri->uri);
convert_uri_to_file_name(conn, path, sizeof(path), &file);
conn->throttle = set_throttle(conn->ctx->config[THROTTLE],
get_remote_ip(conn), ri->uri);
DEBUG_TRACE(("%s", ri->uri));
// Perform redirect and auth checks before calling begin_request() handler.
// Otherwise, begin_request() would need to perform auth checks and redirects.
if (!conn->client.is_ssl && conn->client.ssl_redir &&
(ssl_index = get_first_ssl_listener_index(conn->ctx)) > -1) {
redirect_to_https_port(conn, ssl_index);
} else if (!is_put_or_delete_request(conn) &&
!check_authorization(conn, path)) {
send_authorization_request(conn);
} else if (conn->ctx->callbacks.begin_request != NULL &&
conn->ctx->callbacks.begin_request(conn)) {
// Do nothing, callback has served the request
#if defined(USE_WEBSOCKET)
} else if (is_websocket_request(conn)) {
handle_websocket_request(conn);
#endif
} else if (!strcmp(ri->request_method, "OPTIONS")) {
send_options(conn);
} else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) {
send_http_error(conn, 404, "Not Found", "Not Found");
} else if (is_put_or_delete_request(conn) &&
(is_authorized_for_put(conn) != 1)) {
send_authorization_request(conn);
} else if (!strcmp(ri->request_method, "PUT")) {
put_file(conn, path);
} else if (!strcmp(ri->request_method, "MKCOL")) {
mkcol(conn, path);
} else if (!strcmp(ri->request_method, "DELETE")) {
struct de de;
memset(&de.file, 0, sizeof(de.file));
if(!mg_stat(conn, path, &de.file)) {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
} else {
if(de.file.modification_time) {
if(de.file.is_directory) {
remove_directory(conn, path);
send_http_error(conn, 204, "No Content", "%s", "");
} else if (mg_remove(path) == 0) {
send_http_error(conn, 204, "No Content", "%s", "");
} else {
send_http_error(conn, 423, "Locked", "remove(%s): %s", path,
strerror(ERRNO));
}
}
else {
send_http_error(conn, 500, http_500_error, "remove(%s): %s", path,
strerror(ERRNO));
}
}
} else if ((file.membuf == NULL && file.modification_time == (time_t) 0) ||
must_hide_file(conn, path)) {
send_http_error(conn, 404, "Not Found", "%s", "File not found");
} else if (file.is_directory && ri->uri[uri_len - 1] != '/') {
mg_printf(conn, "HTTP/1.1 301 Moved Permanently\r\n"
"Location: %s/\r\n\r\n", ri->uri);
} else if (!strcmp(ri->request_method, "PROPFIND")) {
handle_propfind(conn, path, &file);
} else if (file.is_directory &&
!substitute_index_file(conn, path, sizeof(path), &file)) {
if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) {
handle_directory_request(conn, path);
} else {
send_http_error(conn, 403, "Directory Listing Denied",
"Directory listing denied");
}
#ifdef USE_LUA
} else if (match_prefix("**.lp$", 6, path) > 0) {
handle_lsp_request(conn, path, &file, NULL);
#endif
#if !defined(NO_CGI)
} else if (match_prefix(conn->ctx->config[CGI_EXTENSIONS],
strlen(conn->ctx->config[CGI_EXTENSIONS]),
path) > 0) {
if (strcmp(ri->request_method, "POST") &&
strcmp(ri->request_method, "HEAD") &&
strcmp(ri->request_method, "GET")) {
send_http_error(conn, 501, "Not Implemented",
"Method %s is not implemented", ri->request_method);
} else {
handle_cgi_request(conn, path);
}
#endif // !NO_CGI
} else if (match_prefix(conn->ctx->config[SSI_EXTENSIONS],
strlen(conn->ctx->config[SSI_EXTENSIONS]),
path) > 0) {
handle_ssi_file_request(conn, path);
} else if (is_not_modified(conn, &file)) {
send_http_error(conn, 304, "Not Modified", "%s", "");
} else {
handle_file_request(conn, path, &file);
}
}
static void close_all_listening_sockets(struct mg_context *ctx) {
int i;
for (i = 0; i < ctx->num_listening_sockets; i++) {
closesocket(ctx->listening_sockets[i].sock);
}
free(ctx->listening_sockets);
}
static int is_valid_port(unsigned int port) {
return port > 0 && port < 0xffff;
}
// Valid listening port specification is: [ip_address:]port[s]
// Examples: 80, 443s, 127.0.0.1:3128, 1.2.3.4:8080s
// TODO(lsm): add parsing of the IPv6 address
static int parse_port_string(const struct vec *vec, struct socket *so) {
unsigned int a, b, c, d, ch, port;
int len;
#if defined(USE_IPV6)
char buf[100];
#endif
// MacOS needs that. If we do not zero it, subsequent bind() will fail.
// Also, all-zeroes in the socket address means binding to all addresses
// for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
memset(so, 0, sizeof(*so));
so->lsa.sin.sin_family = AF_INET;
if (sscanf(vec->ptr, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
// Bind to a specific IPv4 address, e.g. 192.168.1.5:8080
so->lsa.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d);
so->lsa.sin.sin_port = htons((uint16_t) port);
#if defined(USE_IPV6)
} else if (sscanf(vec->ptr, "[%49[^]]]:%d%n", buf, &port, &len) == 2 &&
inet_pton(AF_INET6, buf, &so->lsa.sin6.sin6_addr)) {
// IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080
so->lsa.sin6.sin6_family = AF_INET6;
so->lsa.sin6.sin6_port = htons((uint16_t) port);
#endif
} else if (sscanf(vec->ptr, "%u%n", &port, &len) == 1) {
// If only port is specified, bind to IPv4, INADDR_ANY
so->lsa.sin.sin_port = htons((uint16_t) port);
} else {
port = len = 0; // Parsing failure. Make port invalid.
}
ch = vec->ptr[len]; // Next character after the port number
so->is_ssl = ch == 's';
so->ssl_redir = ch == 'r';
// Make sure the port is valid and vector ends with 's', 'r' or ','
return is_valid_port(port) &&
(ch == '\0' || ch == 's' || ch == 'r' || ch == ',');
}
static int set_ports_option(struct mg_context *ctx) {
const char *list = ctx->config[LISTENING_PORTS];
int on = 1, success = 1;
#if defined(USE_IPV6)
int off = 0;
#endif
struct vec vec;
struct socket so, *ptr;
while (success && (list = next_option(list, &vec, NULL)) != NULL) {
if (!parse_port_string(&vec, &so)) {
cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s",
__func__, (int) vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|r]");
success = 0;
} else if (so.is_ssl && ctx->ssl_ctx == NULL) {
cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?");
success = 0;
} else if ((so.sock = socket(so.lsa.sa.sa_family, SOCK_STREAM, 6)) ==
INVALID_SOCKET ||
// On Windows, SO_REUSEADDR is recommended only for
// broadcast UDP sockets
setsockopt(so.sock, SOL_SOCKET, SO_REUSEADDR,
(void *) &on, sizeof(on)) != 0 ||
#if defined(USE_IPV6)
(so.lsa.sa.sa_family == AF_INET6 &&
setsockopt(so.sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &off,
sizeof(off)) != 0) ||
#endif
bind(so.sock, &so.lsa.sa, so.lsa.sa.sa_family == AF_INET ?
sizeof(so.lsa.sin) : sizeof(so.lsa)) != 0 ||
listen(so.sock, SOMAXCONN) != 0) {
cry(fc(ctx), "%s: cannot bind to %.*s: %d (%s)", __func__,
(int) vec.len, vec.ptr, ERRNO, strerror(errno));
closesocket(so.sock);
success = 0;
} else if ((ptr = (struct socket *) realloc(ctx->listening_sockets,
(ctx->num_listening_sockets + 1) *
sizeof(ctx->listening_sockets[0]))) == NULL) {
closesocket(so.sock);
success = 0;
} else {
set_close_on_exec(so.sock);
ctx->listening_sockets = ptr;
ctx->listening_sockets[ctx->num_listening_sockets] = so;
ctx->num_listening_sockets++;
}
}
if (!success) {
close_all_listening_sockets(ctx);
}
return success;
}
static void log_header(const struct mg_connection *conn, const char *header,
FILE *fp) {
const char *header_value;
if ((header_value = mg_get_header(conn, header)) == NULL) {
(void) fprintf(fp, "%s", " -");
} else {
(void) fprintf(fp, " \"%s\"", header_value);
}
}
static void log_access(const struct mg_connection *conn) {
const struct mg_request_info *ri;
FILE *fp;
char date[64], src_addr[IP_ADDR_STR_LEN];
fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL :
fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+");
if (fp == NULL)
return;
strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z",
localtime(&conn->birth_time));
ri = &conn->request_info;
flockfile(fp);
sockaddr_to_string(src_addr, sizeof(src_addr), &conn->client.rsa);
fprintf(fp, "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT,
src_addr, ri->remote_user == NULL ? "-" : ri->remote_user, date,
ri->request_method ? ri->request_method : "-",
ri->uri ? ri->uri : "-", ri->http_version,
conn->status_code, conn->num_bytes_sent);
log_header(conn, "Referer", fp);
log_header(conn, "User-Agent", fp);
fputc('\n', fp);
fflush(fp);
funlockfile(fp);
fclose(fp);
}
// Verify given socket address against the ACL.
// Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
static int check_acl(struct mg_context *ctx, uint32_t remote_ip) {
int allowed, flag;
uint32_t net, mask;
struct vec vec;
const char *list = ctx->config[ACCESS_CONTROL_LIST];
// If any ACL is set, deny by default
allowed = list == NULL ? '+' : '-';
while ((list = next_option(list, &vec, NULL)) != NULL) {
flag = vec.ptr[0];
if ((flag != '+' && flag != '-') ||
parse_net(&vec.ptr[1], &net, &mask) == 0) {
cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__);
return -1;
}
if (net == (remote_ip & mask)) {
allowed = flag;
}
}
return allowed == '+';
}
#if !defined(_WIN32)
static int set_uid_option(struct mg_context *ctx) {
struct passwd *pw;
const char *uid = ctx->config[RUN_AS_USER];
int success = 0;
if (uid == NULL) {
success = 1;
} else {
if ((pw = getpwnam(uid)) == NULL) {
cry(fc(ctx), "%s: unknown user [%s]", __func__, uid);
} else if (setgid(pw->pw_gid) == -1) {
cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno));
} else if (setuid(pw->pw_uid) == -1) {
cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno));
} else {
success = 1;
}
}
return success;
}
#endif // !_WIN32
#if !defined(NO_SSL)
static pthread_mutex_t *ssl_mutexes;
static int sslize(struct mg_connection *conn, SSL_CTX *s, int (*func)(SSL *)) {
return (conn->ssl = SSL_new(s)) != NULL &&
SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
func(conn->ssl) == 1;
}
// Return OpenSSL error message
static const char *ssl_error(void) {
unsigned long err;
err = ERR_get_error();
return err == 0 ? "" : ERR_error_string(err, NULL);
}
static void ssl_locking_callback(int mode, int mutex_num, const char *file,
int line) {
(void) line;
(void) file;
if (mode & 1) { // 1 is CRYPTO_LOCK
(void) pthread_mutex_lock(&ssl_mutexes[mutex_num]);
} else {
(void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]);
}
}
static unsigned long ssl_id_callback(void) {
return (unsigned long) pthread_self();
}
#if !defined(NO_SSL_DL)
static int load_dll(struct mg_context *ctx, const char *dll_name,
struct ssl_func *sw) {
union {void *p; void (*fp)(void);} u;
void *dll_handle;
struct ssl_func *fp;
if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) {
cry(fc(ctx), "%s: cannot load %s", __func__, dll_name);
syslog(LOG_ERR, "%s: cannot load %s", __func__, dll_name);
return 0;
}
for (fp = sw; fp->name != NULL; fp++) {
#ifdef _WIN32
// GetProcAddress() returns pointer to function
u.fp = (void (*)(void)) dlsym(dll_handle, fp->name);
#else
// dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to
// function pointers. We need to use a union to make a cast.
u.p = dlsym(dll_handle, fp->name);
#endif // _WIN32
if (u.fp == NULL) {
cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name);
return 0;
} else {
fp->ptr = u.fp;
}
}
return 1;
}
#endif // NO_SSL_DL
// Dynamically load SSL library. Set up ctx->ssl_ctx pointer.
static int set_ssl_option(struct mg_context *ctx) {
int i, size;
const char *pem;
// If PEM file is not specified and the init_ssl callback
// is not specified, skip SSL initialization.
if ((pem = ctx->config[SSL_CERTIFICATE]) == NULL &&
ctx->callbacks.init_ssl == NULL) {
return 1;
}
#if !defined(NO_SSL_DL)
if (!load_dll(ctx, SSL_LIB, ssl_sw) ||
!load_dll(ctx, CRYPTO_LIB, crypto_sw)) {
syslog(LOG_ERR, "set_ssl_option: failed to load dll");
return 0;
}
#endif // NO_SSL_DL
// Initialize SSL library
SSL_library_init();
SSL_load_error_strings();
if ((ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) {
cry(fc(ctx), "SSL_CTX_new (server) error: %s", ssl_error());
syslog(LOG_ERR, "set_ssl_option: SSL_CTX_new (server) error: %s", ssl_error());
return 0;
}
// If user callback returned non-NULL, that means that user callback has
// set up certificate itself. In this case, skip sertificate setting.
if ((ctx->callbacks.init_ssl == NULL ||
!ctx->callbacks.init_ssl(ctx->ssl_ctx, ctx->user_data)) &&
(SSL_CTX_use_certificate_file(ctx->ssl_ctx, pem, 1) == 0 ||
SSL_CTX_use_PrivateKey_file(ctx->ssl_ctx, pem, 1) == 0)) {
cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error());
syslog(LOG_ERR, "set_ssl_option: %s: cannot open %s: %s", __func__, pem, ssl_error());
return 0;
}
if (pem != NULL) {
(void) SSL_CTX_use_certificate_chain_file(ctx->ssl_ctx, pem);
}
// Initialize locking callbacks, needed for thread safety.
// http://www.openssl.org/support/faq.html#PROG1
size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
syslog(LOG_ERR, "set_ssl_option: %s: cannot allocate mutexes: %s", __func__, ssl_error());
return 0;
}
for (i = 0; i < CRYPTO_num_locks(); i++) {
pthread_mutex_init(&ssl_mutexes[i], NULL);
}
CRYPTO_set_locking_callback(&ssl_locking_callback);
CRYPTO_set_id_callback(&ssl_id_callback);
return 1;
}
static void uninitialize_ssl(struct mg_context *ctx) {
int i;
if (ctx->ssl_ctx != NULL) {
CRYPTO_set_locking_callback(NULL);
for (i = 0; i < CRYPTO_num_locks(); i++) {
pthread_mutex_destroy(&ssl_mutexes[i]);
}
CRYPTO_set_locking_callback(NULL);
CRYPTO_set_id_callback(NULL);
}
}
#endif // !NO_SSL
static int set_gpass_option(struct mg_context *ctx) {
struct file file = STRUCT_FILE_INITIALIZER;
const char *path = ctx->config[GLOBAL_PASSWORDS_FILE];
if (path != NULL && !mg_stat(fc(ctx), path, &file)) {
cry(fc(ctx), "Cannot open %s: %s", path, strerror(ERRNO));
return 0;
}
return 1;
}
static int set_acl_option(struct mg_context *ctx) {
return check_acl(ctx, (uint32_t) 0x7f000001UL) != -1;
}
static void reset_per_request_attributes(struct mg_connection *conn) {
conn->path_info = NULL;
conn->num_bytes_sent = conn->consumed_content = 0;
conn->status_code = -1;
conn->must_close = conn->request_len = conn->throttle = 0;
}
static void close_socket_gracefully(struct mg_connection *conn) {
#if defined(_WIN32)
char buf[MG_BUF_LEN];
int n;
#endif
struct linger linger;
// Set linger option to avoid socket hanging out after close. This prevent
// ephemeral port exhaust problem under high QPS.
linger.l_onoff = 1;
linger.l_linger = 1;
setsockopt(conn->client.sock, SOL_SOCKET, SO_LINGER,
(char *) &linger, sizeof(linger));
// Send FIN to the client
shutdown(conn->client.sock, SHUT_WR);
set_non_blocking_mode(conn->client.sock);
#if defined(_WIN32)
// Read and discard pending incoming data. If we do not do that and close the
// socket, the data in the send buffer may be discarded. This
// behaviour is seen on Windows, when client keeps sending data
// when server decides to close the connection; then when client
// does recv() it gets no data back.
do {
n = pull(NULL, conn, buf, sizeof(buf));
} while (n > 0);
#endif
// Now we know that our FIN is ACK-ed, safe to close
closesocket(conn->client.sock);
}
static void close_connection(struct mg_connection *conn) {
conn->must_close = 1;
#ifndef NO_SSL
if (conn->ssl != NULL) {
// Run SSL_shutdown twice to ensure completly close SSL connection
SSL_shutdown(conn->ssl);
SSL_free(conn->ssl);
conn->ssl = NULL;
}
#endif
if (conn->client.sock != INVALID_SOCKET) {
close_socket_gracefully(conn);
conn->client.sock = INVALID_SOCKET;
}
}
void mg_close_connection(struct mg_connection *conn) {
#ifndef NO_SSL
if (conn->client_ssl_ctx != NULL) {
SSL_CTX_free((SSL_CTX *) conn->client_ssl_ctx);
}
#endif
close_connection(conn);
free(conn);
}
struct mg_connection *mg_connect(const char *host, int port, int use_ssl,
char *ebuf, size_t ebuf_len) {
static struct mg_context fake_ctx;
struct mg_connection *conn = NULL;
SOCKET sock;
if ((sock = conn2(host, port, use_ssl, ebuf, ebuf_len)) == INVALID_SOCKET) {
} else if ((conn = (struct mg_connection *)
calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE)) == NULL) {
snprintf(ebuf, ebuf_len, "calloc(): %s", strerror(ERRNO));
closesocket(sock);
#ifndef NO_SSL
} else if (use_ssl && (conn->client_ssl_ctx =
SSL_CTX_new(SSLv23_client_method())) == NULL) {
snprintf(ebuf, ebuf_len, "SSL_CTX_new error");
closesocket(sock);
free(conn);
conn = NULL;
#endif // NO_SSL
} else {
socklen_t len = sizeof(struct sockaddr);
conn->buf_size = MAX_REQUEST_SIZE;
conn->buf = (char *) (conn + 1);
conn->ctx = &fake_ctx;
conn->client.sock = sock;
getsockname(sock, &conn->client.rsa.sa, &len);
conn->client.is_ssl = use_ssl;
#ifndef NO_SSL
if (use_ssl) {
// SSL_CTX_set_verify call is needed to switch off server certificate
// checking, which is off by default in OpenSSL and on in yaSSL.
SSL_CTX_set_verify(conn->client_ssl_ctx, 0, 0);
sslize(conn, conn->client_ssl_ctx, SSL_connect);
}
#endif
}
return conn;
}
static int is_valid_uri(const char *uri) {
// Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
// URI can be an asterisk (*) or should start with slash.
return uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0');
}
static int getreq(struct mg_connection *conn, char *ebuf, size_t ebuf_len) {
const char *cl;
ebuf[0] = '\0';
reset_per_request_attributes(conn);
conn->request_len = read_request(NULL, conn, conn->buf, conn->buf_size,
&conn->data_len);
assert(conn->request_len < 0 || conn->data_len >= conn->request_len);
if (conn->request_len == 0 && conn->data_len == conn->buf_size) {
snprintf(ebuf, ebuf_len, "%s", "Request Too Large");
} else if (conn->request_len <= 0) {
snprintf(ebuf, ebuf_len, "%s", "Client closed connection");
} else if (parse_http_message(conn->buf, conn->buf_size,
&conn->request_info) <= 0) {
snprintf(ebuf, ebuf_len, "Bad request: [%.*s]", conn->data_len, conn->buf);
} else {
// Request is valid
if ((cl = get_header(&conn->request_info, "Content-Length")) != NULL) {
conn->content_len = strtoll(cl, NULL, 10);
} else if (!mg_strcasecmp(conn->request_info.request_method, "POST") ||
!mg_strcasecmp(conn->request_info.request_method, "PUT")) {
conn->content_len = -1;
} else {
conn->content_len = 0;
}
conn->birth_time = time(NULL);
}
return ebuf[0] == '\0';
}
struct mg_connection *mg_download(const char *host, int port, int use_ssl,
char *ebuf, size_t ebuf_len,
const char *fmt, ...) {
struct mg_connection *conn;
va_list ap;
va_start(ap, fmt);
ebuf[0] = '\0';
if ((conn = mg_connect(host, port, use_ssl, ebuf, ebuf_len)) == NULL) {
} else if (mg_vprintf(conn, fmt, ap) <= 0) {
snprintf(ebuf, ebuf_len, "%s", "Error sending request");
} else {
getreq(conn, ebuf, ebuf_len);
}
if (ebuf[0] != '\0' && conn != NULL) {
mg_close_connection(conn);
conn = NULL;
}
return conn;
}
static void process_new_connection(struct mg_connection *conn) {
struct mg_request_info *ri = &conn->request_info;
int keep_alive_enabled, keep_alive, discard_len;
char ebuf[100];
keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes");
keep_alive = 0;
// Important: on new connection, reset the receiving buffer. Credit goes
// to crule42.
conn->data_len = 0;
do {
if (!getreq(conn, ebuf, sizeof(ebuf))) {
send_http_error(conn, 500, "Server Error", "%s", ebuf);
conn->must_close = 1;
} else if (!is_valid_uri(conn->request_info.uri)) {
snprintf(ebuf, sizeof(ebuf), "Invalid URI: [%s]", ri->uri);
send_http_error(conn, 400, "Bad Request", "%s", ebuf);
} else if (strcmp(ri->http_version, "1.0") &&
strcmp(ri->http_version, "1.1")) {
snprintf(ebuf, sizeof(ebuf), "Bad HTTP version: [%s]", ri->http_version);
send_http_error(conn, 505, "Bad HTTP version", "%s", ebuf);
}
if (ebuf[0] == '\0') {
handle_request(conn);
if (conn->ctx->callbacks.end_request != NULL) {
conn->ctx->callbacks.end_request(conn, conn->status_code);
}
log_access(conn);
}
if (ri->remote_user != NULL) {
free((void *) ri->remote_user);
// Important! When having connections with and without auth
// would cause double free and then crash
ri->remote_user = NULL;
}
// NOTE(lsm): order is important here. should_keep_alive() call
// is using parsed request, which will be invalid after memmove's below.
// Therefore, memorize should_keep_alive() result now for later use
// in loop exit condition.
keep_alive = conn->ctx->stop_flag == 0 && keep_alive_enabled &&
conn->content_len >= 0 && should_keep_alive(conn);
// Discard all buffered data for this request
discard_len = conn->content_len >= 0 && conn->request_len > 0 &&
conn->request_len + conn->content_len < (int64_t) conn->data_len ?
(int) (conn->request_len + conn->content_len) : conn->data_len;
assert(discard_len >= 0);
memmove(conn->buf, conn->buf + discard_len, conn->data_len - discard_len);
conn->data_len -= discard_len;
assert(conn->data_len >= 0);
assert(conn->data_len <= conn->buf_size);
} while (keep_alive);
}
// Worker threads take accepted socket from the queue
static int consume_socket(struct mg_context *ctx, struct socket *sp) {
(void) pthread_mutex_lock(&ctx->mutex);
DEBUG_TRACE(("going idle"));
// If the queue is empty, wait. We're idle at this point.
while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) {
pthread_cond_wait(&ctx->sq_full, &ctx->mutex);
}
// If we're stopping, sq_head may be equal to sq_tail.
if (ctx->sq_head > ctx->sq_tail) {
// Copy socket from the queue and increment tail
*sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)];
ctx->sq_tail++;
DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock));
// Wrap pointers if needed
while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) {
ctx->sq_tail -= ARRAY_SIZE(ctx->queue);
ctx->sq_head -= ARRAY_SIZE(ctx->queue);
}
}
(void) pthread_cond_signal(&ctx->sq_empty);
(void) pthread_mutex_unlock(&ctx->mutex);
return !ctx->stop_flag;
}
static void *worker_thread(void *thread_func_param) {
struct mg_context *ctx = (struct mg_context *) thread_func_param;
struct mg_connection *conn;
conn = (struct mg_connection *) calloc(1, sizeof(*conn) + MAX_REQUEST_SIZE);
if (conn == NULL) {
cry(fc(ctx), "%s", "Cannot create new connection struct, OOM");
} else {
conn->buf_size = MAX_REQUEST_SIZE;
conn->buf = (char *) (conn + 1);
conn->ctx = ctx;
conn->request_info.user_data = ctx->user_data;
if (ctx->callbacks.thread_start != NULL) {
ctx->callbacks.thread_start(&conn->request_info.user_data,
&conn->request_info.conn_data);
}
// Call consume_socket() even when ctx->stop_flag > 0, to let it signal
// sq_empty condvar to wake up the master waiting in produce_socket()
while (consume_socket(ctx, &conn->client)) {
conn->birth_time = time(NULL);
// Fill in IP, port info early so even if SSL setup below fails,
// error handler would have the corresponding info.
// Thanks to Johannes Winkelmann for the patch.
// TODO(lsm): Fix IPv6 case
conn->request_info.remote_port = ntohs(conn->client.rsa.sin.sin_port);
memcpy(&conn->request_info.remote_ip,
&conn->client.rsa.sin.sin_addr.s_addr, 4);
conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip);
conn->request_info.is_ssl = conn->client.is_ssl;
if (!conn->client.is_ssl
#ifndef NO_SSL
|| sslize(conn, conn->ctx->ssl_ctx, SSL_accept)
#endif
) {
process_new_connection(conn);
}
close_connection(conn);
}
if (ctx->callbacks.thread_stop != NULL) {
ctx->callbacks.thread_stop(&conn->request_info.user_data,
&conn->request_info.conn_data);
}
free(conn);
}
// Signal master that we're done with connection and exiting
(void) pthread_mutex_lock(&ctx->mutex);
ctx->num_threads--;
(void) pthread_cond_signal(&ctx->cond);
assert(ctx->num_threads >= 0);
(void) pthread_mutex_unlock(&ctx->mutex);
DEBUG_TRACE(("exiting"));
return NULL;
}
// Master thread adds accepted socket to a queue
static void produce_socket(struct mg_context *ctx, const struct socket *sp) {
(void) pthread_mutex_lock(&ctx->mutex);
// If the queue is full, wait
while (ctx->stop_flag == 0 &&
ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) {
(void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex);
}
if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) {
// Copy socket to the queue and increment head
ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp;
ctx->sq_head++;
DEBUG_TRACE(("queued socket %d", sp->sock));
}
(void) pthread_cond_signal(&ctx->sq_full);
(void) pthread_mutex_unlock(&ctx->mutex);
}
static int set_sock_timeout(SOCKET sock, int milliseconds) {
#ifdef _WIN32
DWORD t = milliseconds;
#else
struct timeval t;
t.tv_sec = milliseconds / 1000;
t.tv_usec = (milliseconds * 1000) % 1000000;
#endif
return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (void *) &t, sizeof(t)) ||
setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (void *) &t, sizeof(t));
}
static void accept_new_connection(const struct socket *listener,
struct mg_context *ctx) {
struct socket so;
char src_addr[IP_ADDR_STR_LEN];
socklen_t len = sizeof(so.rsa);
int on = 1;
if ((so.sock = accept(listener->sock, &so.rsa.sa, &len)) == INVALID_SOCKET) {
} else if (!check_acl(ctx, ntohl(* (uint32_t *) &so.rsa.sin.sin_addr))) {
sockaddr_to_string(src_addr, sizeof(src_addr), &so.rsa);
cry(fc(ctx), "%s: %s is not allowed to connect", __func__, src_addr);
closesocket(so.sock);
} else {
// Put so socket structure into the queue
DEBUG_TRACE(("Accepted socket %d", (int) so.sock));
set_close_on_exec(so.sock);
so.is_ssl = listener->is_ssl;
so.ssl_redir = listener->ssl_redir;
getsockname(so.sock, &so.lsa.sa, &len);
// Set TCP keep-alive. This is needed because if HTTP-level keep-alive
// is enabled, and client resets the connection, server won't get
// TCP FIN or RST and will keep the connection open forever. With TCP
// keep-alive, next keep-alive handshake will figure out that the client
// is down and will close the server end.
// Thanks to Igor Klopov who suggested the patch.
setsockopt(so.sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, sizeof(on));
set_sock_timeout(so.sock, atoi(ctx->config[REQUEST_TIMEOUT]));
produce_socket(ctx, &so);
}
}
static void *master_thread(void *thread_func_param) {
struct mg_context *ctx = (struct mg_context *) thread_func_param;
struct pollfd *pfd;
int i;
// Increase priority of the master thread
#if defined(_WIN32)
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
#endif
#if defined(ISSUE_317)
struct sched_param sched_param;
sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param);
#endif
if (ctx->callbacks.thread_start != NULL) {
ctx->callbacks.thread_start(&ctx->user_data, NULL);
}
pfd = (struct pollfd *) calloc(ctx->num_listening_sockets, sizeof(pfd[0]));
while (pfd != NULL && ctx->stop_flag == 0) {
for (i = 0; i < ctx->num_listening_sockets; i++) {
pfd[i].fd = ctx->listening_sockets[i].sock;
pfd[i].events = POLLIN;
}
if (poll(pfd, ctx->num_listening_sockets, 200) > 0) {
for (i = 0; i < ctx->num_listening_sockets; i++) {
// NOTE(lsm): on QNX, poll() returns POLLRDNORM after the
// successfull poll, and POLLIN is defined as (POLLRDNORM | POLLRDBAND)
// Therefore, we're checking pfd[i].revents & POLLIN, not
// pfd[i].revents == POLLIN.
if (ctx->stop_flag == 0 && (pfd[i].revents & POLLIN)) {
accept_new_connection(&ctx->listening_sockets[i], ctx);
}
}
}
}
free(pfd);
DEBUG_TRACE(("stopping workers"));
// Stop signal received: somebody called mg_stop. Quit.
close_all_listening_sockets(ctx);
// Wakeup workers that are waiting for connections to handle.
pthread_cond_broadcast(&ctx->sq_full);
// Wait until all threads finish
(void) pthread_mutex_lock(&ctx->mutex);
while (ctx->num_threads > 0) {
(void) pthread_cond_wait(&ctx->cond, &ctx->mutex);
}
(void) pthread_mutex_unlock(&ctx->mutex);
// All threads exited, no sync is needed. Destroy mutex and condvars
(void) pthread_mutex_destroy(&ctx->mutex);
(void) pthread_cond_destroy(&ctx->cond);
(void) pthread_cond_destroy(&ctx->sq_empty);
(void) pthread_cond_destroy(&ctx->sq_full);
#if !defined(NO_SSL)
uninitialize_ssl(ctx);
#endif
DEBUG_TRACE(("exiting"));
if (ctx->callbacks.thread_stop != NULL) {
ctx->callbacks.thread_stop(&ctx->user_data, NULL);
}
// Signal mg_stop() that we're done.
// WARNING: This must be the very last thing this
// thread does, as ctx becomes invalid after this line.
ctx->stop_flag = 2;
return NULL;
}
static void free_context(struct mg_context *ctx) {
int i;
// Deallocate config parameters
for (i = 0; i < NUM_OPTIONS; i++) {
if (ctx->config[i] != NULL)
free(ctx->config[i]);
}
#ifndef NO_SSL
// Deallocate SSL context
if (ctx->ssl_ctx != NULL) {
SSL_CTX_free(ctx->ssl_ctx);
}
if (ssl_mutexes != NULL) {
free(ssl_mutexes);
ssl_mutexes = NULL;
}
#endif // !NO_SSL
// Deallocate context itself
free(ctx);
}
void mg_stop(struct mg_context *ctx) {
ctx->stop_flag = 1;
// Wait until mg_fini() stops
while (ctx->stop_flag != 2) {
(void) mg_sleep(10);
}
free_context(ctx);
#if defined(_WIN32) && !defined(__SYMBIAN32__)
(void) WSACleanup();
#endif // _WIN32
}
struct mg_context *mg_start(const struct mg_callbacks *callbacks,
void *user_data,
const char **options) {
struct mg_context *ctx;
const char *name, *value, *default_value;
int i;
#if defined(_WIN32) && !defined(__SYMBIAN32__)
WSADATA data;
WSAStartup(MAKEWORD(2,2), &data);
#endif // _WIN32
// Allocate context and initialize reasonable general case defaults.
// TODO(lsm): do proper error handling here.
if ((ctx = (struct mg_context *) calloc(1, sizeof(*ctx))) == NULL) {
return NULL;
}
ctx->callbacks = *callbacks;
ctx->user_data = user_data;
while (options && (name = *options++) != NULL) {
if ((i = get_option_index(name)) == -1) {
cry(fc(ctx), "Invalid option: %s", name);
free_context(ctx);
return NULL;
} else if ((value = *options++) == NULL) {
cry(fc(ctx), "%s: option value cannot be NULL", name);
free_context(ctx);
return NULL;
}
if (ctx->config[i] != NULL) {
cry(fc(ctx), "warning: %s: duplicate option", name);
free(ctx->config[i]);
}
ctx->config[i] = mg_strdup(value);
DEBUG_TRACE(("[%s] -> [%s]", name, value));
}
// Set default value if needed
for (i = 0; config_options[i * 2] != NULL; i++) {
default_value = config_options[i * 2 + 1];
if (ctx->config[i] == NULL && default_value != NULL) {
ctx->config[i] = mg_strdup(default_value);
}
}
// NOTE(lsm): order is important here. SSL certificates must
// be initialized before listening ports. UID must be set last.
if (!set_gpass_option(ctx) ||
#if !defined(NO_SSL)
!set_ssl_option(ctx) ||
#endif
!set_ports_option(ctx) ||
#if !defined(_WIN32)
!set_uid_option(ctx) ||
#endif
!set_acl_option(ctx)) {
syslog (LOG_ERR, "mg_start: failed to set option.");
free_context(ctx);
return NULL;
}
#if !defined(_WIN32) && !defined(__SYMBIAN32__)
// Ignore SIGPIPE signal, so if browser cancels the request, it
// won't kill the whole process.
(void) signal(SIGPIPE, SIG_IGN);
#endif // !_WIN32
(void) pthread_mutex_init(&ctx->mutex, NULL);
(void) pthread_cond_init(&ctx->cond, NULL);
(void) pthread_cond_init(&ctx->sq_empty, NULL);
(void) pthread_cond_init(&ctx->sq_full, NULL);
// Start master (listening) thread
mg_start_thread(master_thread, ctx);
// Start worker threads
for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) {
if (mg_start_thread(worker_thread, ctx) != 0) {
cry(fc(ctx), "Cannot start worker thread: %ld", (long) ERRNO);
} else {
ctx->num_threads++;
}
}
return ctx;
}
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