Revision 6d3248ab27b4aa2b4f3177ad697cb2eedd391966 authored by David E. O'Brien on 03 September 2000, 02:46:58 UTC, committed by David E. O'Brien on 03 September 2000, 02:46:58 UTC
1 parent 8aa5970
http.c
/*-
* Copyright (c) 2000 Dag-Erling Coďdan Smřrgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* The following copyright applies to the base64 code:
*
*-
* Copyright 1997 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "fetch.h"
#include "common.h"
#include "httperr.h"
extern char *__progname; /* XXX not portable */
/* Maximum number of redirects to follow */
#define MAX_REDIRECT 5
/* Symbolic names for reply codes we care about */
#define HTTP_OK 200
#define HTTP_PARTIAL 206
#define HTTP_MOVED_PERM 301
#define HTTP_MOVED_TEMP 302
#define HTTP_SEE_OTHER 303
#define HTTP_NEED_AUTH 401
#define HTTP_NEED_PROXY_AUTH 403
#define HTTP_PROTOCOL_ERROR 999
#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
|| (xyz) == HTTP_MOVED_TEMP \
|| (xyz) == HTTP_SEE_OTHER)
/*****************************************************************************
* I/O functions for decoding chunked streams
*/
struct cookie
{
int fd;
char *buf;
size_t b_size;
size_t b_len;
int b_pos;
int eof;
int error;
long chunksize;
#ifndef NDEBUG
long total;
#endif
};
/*
* Get next chunk header
*/
static int
_http_new_chunk(struct cookie *c)
{
char *p;
if (_fetch_getln(c->fd, &c->buf, &c->b_size, &c->b_len) == -1)
return -1;
if (c->b_len < 2 || !ishexnumber(*c->buf))
return -1;
for (p = c->buf; !isspace(*p) && *p != ';' && p < c->buf + c->b_len; ++p)
if (!ishexnumber(*p))
return -1;
else if (isdigit(*p))
c->chunksize = c->chunksize * 16 + *p - '0';
else
c->chunksize = c->chunksize * 16 + 10 + tolower(*p) - 'a';
#ifndef NDEBUG
c->total += c->chunksize;
if (c->chunksize == 0)
fprintf(stderr, "\033[1m_http_fillbuf(): "
"end of last chunk\033[m\n");
else
fprintf(stderr, "\033[1m_http_fillbuf(): "
"new chunk: %ld (%ld)\033[m\n", c->chunksize, c->total);
#endif
return c->chunksize;
}
/*
* Fill the input buffer, do chunk decoding on the fly
*/
static int
_http_fillbuf(struct cookie *c)
{
if (c->error)
return -1;
if (c->eof)
return 0;
if (c->chunksize == 0) {
switch (_http_new_chunk(c)) {
case -1:
c->error = 1;
return -1;
case 0:
c->eof = 1;
return 0;
}
}
if (c->b_size < c->chunksize) {
char *tmp;
if ((tmp = realloc(c->buf, c->chunksize)) == NULL)
return -1;
c->buf = tmp;
c->b_size = c->chunksize;
}
if ((c->b_len = read(c->fd, c->buf, c->chunksize)) == -1)
return -1;
c->chunksize -= c->b_len;
if (c->chunksize == 0) {
char endl[2];
read(c->fd, endl, 2);
}
c->b_pos = 0;
return c->b_len;
}
/*
* Read function
*/
static int
_http_readfn(void *v, char *buf, int len)
{
struct cookie *c = (struct cookie *)v;
int l, pos;
if (c->error)
return -1;
if (c->eof)
return 0;
for (pos = 0; len > 0; pos += l, len -= l) {
/* empty buffer */
if (!c->buf || c->b_pos == c->b_len)
if (_http_fillbuf(c) < 1)
break;
l = c->b_len - c->b_pos;
if (len < l)
l = len;
bcopy(c->buf + c->b_pos, buf + pos, l);
c->b_pos += l;
}
if (!pos && c->error)
return -1;
return pos;
}
/*
* Write function
*/
static int
_http_writefn(void *v, const char *buf, int len)
{
struct cookie *c = (struct cookie *)v;
return write(c->fd, buf, len);
}
/*
* Close function
*/
static int
_http_closefn(void *v)
{
struct cookie *c = (struct cookie *)v;
int r;
r = close(c->fd);
if (c->buf)
free(c->buf);
free(c);
return r;
}
/*
* Wrap a file descriptor up
*/
static FILE *
_http_funopen(int fd)
{
struct cookie *c;
FILE *f;
if ((c = calloc(1, sizeof *c)) == NULL) {
_fetch_syserr();
return NULL;
}
c->fd = fd;
if (!(f = funopen(c, _http_readfn, _http_writefn, NULL, _http_closefn))) {
_fetch_syserr();
free(c);
return NULL;
}
return f;
}
/*****************************************************************************
* Helper functions for talking to the server and parsing its replies
*/
/* Header types */
typedef enum {
hdr_syserror = -2,
hdr_error = -1,
hdr_end = 0,
hdr_unknown = 1,
hdr_content_length,
hdr_content_range,
hdr_last_modified,
hdr_location,
hdr_transfer_encoding
} hdr;
/* Names of interesting headers */
static struct {
hdr num;
char *name;
} hdr_names[] = {
{ hdr_content_length, "Content-Length" },
{ hdr_content_range, "Content-Range" },
{ hdr_last_modified, "Last-Modified" },
{ hdr_location, "Location" },
{ hdr_transfer_encoding, "Transfer-Encoding" },
{ hdr_unknown, NULL },
};
static char *reply_buf;
static size_t reply_size;
static size_t reply_length;
/*
* Send a formatted line; optionally echo to terminal
*/
static int
_http_cmd(int fd, char *fmt, ...)
{
va_list ap;
size_t len;
char *msg;
int r;
va_start(ap, fmt);
len = vasprintf(&msg, fmt, ap);
va_end(ap);
if (msg == NULL) {
errno = ENOMEM;
_fetch_syserr();
return -1;
}
r = _fetch_putln(fd, msg, len);
free(msg);
if (r == -1) {
_fetch_syserr();
return -1;
}
return 0;
}
/*
* Get and parse status line
*/
static int
_http_get_reply(int fd)
{
if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
return -1;
/*
* A valid status line looks like "HTTP/m.n xyz reason" where m
* and n are the major and minor protocol version numbers and xyz
* is the reply code.
* We grok HTTP 1.0 and 1.1, so m must be 1 and n must be 0 or 1.
* We don't care about the reason phrase.
*/
if (strncmp(reply_buf, "HTTP/1.", 7) != 0
|| (reply_buf[7] != '0' && reply_buf[7] != '1') || reply_buf[8] != ' '
|| !isdigit(reply_buf[9])
|| !isdigit(reply_buf[10])
|| !isdigit(reply_buf[11]))
return HTTP_PROTOCOL_ERROR;
return ((reply_buf[9] - '0') * 100
+ (reply_buf[10] - '0') * 10
+ (reply_buf[11] - '0'));
}
/*
* Check a header; if the type matches the given string, return a
* pointer to the beginning of the value.
*/
static char *
_http_match(char *str, char *hdr)
{
while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
/* nothing */;
if (*str || *hdr != ':')
return NULL;
while (*hdr && isspace(*++hdr))
/* nothing */;
return hdr;
}
/*
* Get the next header and return the appropriate symbolic code.
*/
static hdr
_http_next_header(int fd, char **p)
{
int i;
if (_fetch_getln(fd, &reply_buf, &reply_size, &reply_length) == -1)
return hdr_syserror;
while (reply_length && isspace(reply_buf[reply_length-1]))
reply_length--;
reply_buf[reply_length] = 0;
if (reply_length == 0)
return hdr_end;
/*
* We could check for malformed headers but we don't really care.
* A valid header starts with a token immediately followed by a
* colon; a token is any sequence of non-control, non-whitespace
* characters except "()<>@,;:\\\"{}".
*/
for (i = 0; hdr_names[i].num != hdr_unknown; i++)
if ((*p = _http_match(hdr_names[i].name, reply_buf)) != NULL)
return hdr_names[i].num;
return hdr_unknown;
}
/*
* Parse a last-modified header
*/
static int
_http_parse_mtime(char *p, time_t *mtime)
{
char locale[64], *r;
struct tm tm;
strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
setlocale(LC_TIME, "C");
r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
/* XXX should add support for date-2 and date-3 */
setlocale(LC_TIME, locale);
if (r == NULL)
return -1;
DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
"%02d:%02d:%02d\033[m]\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec));
*mtime = timegm(&tm);
return 0;
}
/*
* Parse a content-length header
*/
static int
_http_parse_length(char *p, off_t *length)
{
off_t len;
for (len = 0; *p && isdigit(*p); ++p)
len = len * 10 + (*p - '0');
DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", len));
*length = len;
return 0;
}
/*
* Parse a content-range header
*/
static int
_http_parse_range(char *p, off_t *offset, off_t *length, off_t *size)
{
int first, last, len;
if (strncasecmp(p, "bytes ", 6) != 0)
return -1;
for (first = 0, p += 6; *p && isdigit(*p); ++p)
first = first * 10 + *p - '0';
if (*p != '-')
return -1;
for (last = 0, ++p; *p && isdigit(*p); ++p)
last = last * 10 + *p - '0';
if (first > last || *p != '/')
return -1;
for (len = 0, ++p; *p && isdigit(*p); ++p)
len = len * 10 + *p - '0';
if (len < last - first + 1)
return -1;
DEBUG(fprintf(stderr, "content range: [\033[1m%d-%d/%d\033[m]\n",
first, last, len));
*offset = first;
*length = last - first + 1;
*size = len;
return 0;
}
/*****************************************************************************
* Helper functions for authorization
*/
/*
* Base64 encoding
*/
static char *
_http_base64(char *src)
{
static const char base64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
char *str, *dst;
size_t l;
int t, r;
l = strlen(src);
if ((str = malloc(((l + 2) / 3) * 4)) == NULL)
return NULL;
dst = str;
r = 0;
while (l >= 3) {
t = (src[0] << 16) | (src[1] << 8) | src[2];
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = base64[(t >> 6) & 0x3f];
dst[3] = base64[(t >> 0) & 0x3f];
src += 3; l -= 3;
dst += 4; r += 4;
}
switch (l) {
case 2:
t = (src[0] << 16) | (src[1] << 8);
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = base64[(t >> 6) & 0x3f];
dst[3] = '=';
dst += 4;
r += 4;
break;
case 1:
t = src[0] << 16;
dst[0] = base64[(t >> 18) & 0x3f];
dst[1] = base64[(t >> 12) & 0x3f];
dst[2] = dst[3] = '=';
dst += 4;
r += 4;
break;
case 0:
break;
}
*dst = 0;
return str;
}
/*
* Encode username and password
*/
static int
_http_basic_auth(int fd, char *hdr, char *usr, char *pwd)
{
char *upw, *auth;
int r;
if (asprintf(&upw, "%s:%s", usr, pwd) == -1)
return -1;
auth = _http_base64(upw);
free(upw);
if (auth == NULL)
return -1;
r = _http_cmd(fd, "%s: Basic %s", hdr, auth);
free(auth);
return r;
}
/*
* Send an authorization header
*/
static int
_http_authorize(int fd, char *hdr, char *p)
{
/* basic authorization */
if (strncasecmp(p, "basic:", 6) == 0) {
char *user, *pwd, *str;
int r;
/* skip realm */
for (p += 6; *p && *p != ':'; ++p)
/* nothing */ ;
if (!*p || strchr(++p, ':') == NULL)
return -1;
if ((str = strdup(p)) == NULL)
return -1; /* XXX */
user = str;
pwd = strchr(str, ':');
*pwd++ = '\0';
r = _http_basic_auth(fd, hdr, user, pwd);
free(str);
return r;
}
return -1;
}
/*****************************************************************************
* Helper functions for connecting to a server or proxy
*/
/*
* Return the default port for this scheme
*/
static int
_http_default_port(char *scheme)
{
struct servent *se;
if ((se = getservbyname(scheme, "tcp")) != NULL)
return ntohs(se->s_port);
if (strcasecmp(scheme, "ftp") == 0)
return FTP_DEFAULT_PORT;
if (strcasecmp(scheme, "http") == 0)
return HTTP_DEFAULT_PORT;
return 0;
}
/*
* Connect to the specified HTTP proxy server.
*/
static int
_http_proxy_connect(char *proxy, int af, int verbose)
{
char *hostname, *p;
int fd, port;
/* get hostname */
hostname = NULL;
#ifdef INET6
/* host part can be an IPv6 address enclosed in square brackets */
if (*proxy == '[') {
if ((p = strchr(proxy, ']')) == NULL) {
/* no terminating bracket */
/* XXX should set an error code */
goto ouch;
}
if (p[1] != '\0' && p[1] != ':') {
/* garbage after address */
/* XXX should set an error code */
goto ouch;
}
if ((hostname = malloc(p - proxy)) == NULL) {
errno = ENOMEM;
_fetch_syserr();
goto ouch;
}
strncpy(hostname, proxy + 1, p - proxy - 1);
hostname[p - proxy - 1] = '\0';
++p;
} else {
#endif /* INET6 */
if ((p = strchr(proxy, ':')) == NULL)
p = strchr(proxy, '\0');
if ((hostname = malloc(p - proxy + 1)) == NULL) {
errno = ENOMEM;
_fetch_syserr();
goto ouch;
}
strncpy(hostname, proxy, p - proxy);
hostname[p - proxy] = '\0';
#ifdef INET6
}
#endif /* INET6 */
DEBUG(fprintf(stderr, "proxy name: [%s]\n", hostname));
/* get port number */
port = 0;
if (*p == ':') {
++p;
if (strspn(p, "0123456789") != strlen(p) || strlen(p) > 5) {
/* port number is non-numeric or too long */
/* XXX should set an error code */
goto ouch;
}
port = atoi(p);
if (port < 1 || port > 65535) {
/* port number is out of range */
/* XXX should set an error code */
goto ouch;
}
}
if (!port) {
#if 0
/*
* commented out, since there is currently no service name
* for HTTP proxies
*/
struct servent *se;
if ((se = getservbyname("xxxx", "tcp")) != NULL)
port = ntohs(se->s_port);
else
#endif
port = 3128;
}
DEBUG(fprintf(stderr, "proxy port: %d\n", port));
/* connect */
if ((fd = _fetch_connect(hostname, port, af, verbose)) == -1)
_fetch_syserr();
return fd;
ouch:
if (hostname)
free(hostname);
return -1;
}
/*
* Connect to the correct HTTP server or proxy.
*/
static int
_http_connect(struct url *URL, int *proxy, char *flags)
{
int direct, verbose;
int af, fd;
char *p;
#ifdef INET6
af = AF_UNSPEC;
#else
af = AF_INET;
#endif
direct = (flags && strchr(flags, 'd'));
verbose = (flags && strchr(flags, 'v'));
if (flags && strchr(flags, '4'))
af = AF_INET;
else if (flags && strchr(flags, '6'))
af = AF_INET6;
/* check port */
if (!URL->port)
URL->port = _http_default_port(URL->scheme);
if (!direct && (p = getenv("HTTP_PROXY")) != NULL && *p != '\0') {
/* attempt to connect to proxy server */
if ((fd = _http_proxy_connect(p, af, verbose)) == -1)
return -1;
*proxy = 1;
} else {
/* if no proxy is configured, try direct */
if (strcasecmp(URL->scheme, "ftp") == 0) {
/* can't talk http to an ftp server */
/* XXX should set an error code */
return -1;
}
if ((fd = _fetch_connect(URL->host, URL->port, af, verbose)) == -1)
/* _fetch_connect() has already set an error code */
return -1;
*proxy = 0;
}
return fd;
}
/*****************************************************************************
* Core
*/
/*
* Send a request and process the reply
*/
static FILE *
_http_request(struct url *URL, char *op, struct url_stat *us, char *flags)
{
struct url *url, *new;
int chunked, need_auth, noredirect, proxy, verbose;
int code, fd, i, n;
off_t offset, clength, length, size;
time_t mtime;
char *p;
FILE *f;
hdr h;
char *host;
#ifdef INET6
char hbuf[MAXHOSTNAMELEN + 1];
#endif
noredirect = (flags && strchr(flags, 'A'));
verbose = (flags && strchr(flags, 'v'));
/* try the provided URL first */
url = URL;
/* if the A flag is set, we only get one try */
n = noredirect ? 1 : MAX_REDIRECT;
i = 0;
do {
new = NULL;
chunked = 0;
need_auth = 0;
offset = 0;
clength = -1;
length = -1;
size = -1;
mtime = 0;
retry:
/* connect to server or proxy */
if ((fd = _http_connect(url, &proxy, flags)) == -1)
goto ouch;
host = url->host;
#ifdef INET6
if (strchr(url->host, ':')) {
snprintf(hbuf, sizeof(hbuf), "[%s]", url->host);
host = hbuf;
}
#endif
/* send request */
if (verbose)
_fetch_info("requesting %s://%s:%d%s",
url->scheme, host, url->port, url->doc);
if (proxy) {
_http_cmd(fd, "%s %s://%s:%d%s HTTP/1.1",
op, url->scheme, host, url->port, url->doc);
} else {
_http_cmd(fd, "%s %s HTTP/1.1",
op, url->doc);
}
/* proxy authorization */
if (proxy && (p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0')
_http_authorize(fd, "Proxy-Authorization", p);
/* server authorization */
if (need_auth) {
if (*url->user || *url->pwd)
_http_basic_auth(fd, "Authorization",
url->user ? url->user : "",
url->pwd ? url->pwd : "");
else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0')
_http_authorize(fd, "Authorization", p);
else {
_http_seterr(HTTP_NEED_AUTH);
goto ouch;
}
}
/* other headers */
if (url->port == _http_default_port(url->scheme))
_http_cmd(fd, "Host: %s", host);
else
_http_cmd(fd, "Host: %s:%d", host, url->port);
_http_cmd(fd, "User-Agent: %s " _LIBFETCH_VER, __progname);
if (url->offset)
_http_cmd(fd, "Range: bytes=%lld-", url->offset);
_http_cmd(fd, "Connection: close");
_http_cmd(fd, "");
/* get reply */
switch ((code = _http_get_reply(fd))) {
case HTTP_OK:
case HTTP_PARTIAL:
/* fine */
break;
case HTTP_MOVED_PERM:
case HTTP_MOVED_TEMP:
/*
* Not so fine, but we still have to read the headers to
* get the new location.
*/
break;
case HTTP_NEED_AUTH:
if (need_auth) {
/*
* We already sent out authorization code, so there's
* nothing more we can do.
*/
_http_seterr(code);
goto ouch;
}
/* try again, but send the password this time */
if (verbose)
_fetch_info("server requires authorization");
need_auth = 1;
close(fd);
goto retry;
case HTTP_NEED_PROXY_AUTH:
/*
* If we're talking to a proxy, we already sent our proxy
* authorization code, so there's nothing more we can do.
*/
_http_seterr(code);
goto ouch;
case HTTP_PROTOCOL_ERROR:
/* fall through */
case -1:
_fetch_syserr();
goto ouch;
default:
_http_seterr(code);
goto ouch;
}
/* get headers */
do {
switch ((h = _http_next_header(fd, &p))) {
case hdr_syserror:
_fetch_syserr();
goto ouch;
case hdr_error:
_http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
case hdr_content_length:
_http_parse_length(p, &clength);
break;
case hdr_content_range:
_http_parse_range(p, &offset, &length, &size);
break;
case hdr_last_modified:
_http_parse_mtime(p, &mtime);
break;
case hdr_location:
if (!HTTP_REDIRECT(code))
break;
if (new)
free(new);
if (verbose)
_fetch_info("%d redirect to %s", code, p);
if (*p == '/')
/* absolute path */
new = fetchMakeURL(url->scheme, url->host, url->port, p,
url->user, url->pwd);
else
new = fetchParseURL(p);
if (new == NULL) {
/* XXX should set an error code */
DEBUG(fprintf(stderr, "failed to parse new URL\n"));
goto ouch;
}
if (!*new->user && !*new->pwd) {
strcpy(new->user, url->user);
strcpy(new->pwd, url->pwd);
}
new->offset = url->offset;
new->length = url->length;
break;
case hdr_transfer_encoding:
/* XXX weak test*/
chunked = (strcasecmp(p, "chunked") == 0);
break;
case hdr_end:
/* fall through */
case hdr_unknown:
/* ignore */
break;
}
} while (h > hdr_end);
/* we either have a hit, or a redirect with no Location: header */
if (code == HTTP_OK || code == HTTP_PARTIAL || !new)
break;
/* we have a redirect */
close(fd);
fd = -1;
if (url != URL)
fetchFreeURL(url);
url = new;
} while (++i < n);
/* no success */
if (fd == -1) {
_http_seterr(code);
goto ouch;
}
DEBUG(fprintf(stderr, "offset %lld, length %lld, size %lld, clength %lld\n",
offset, length, size, clength));
/* check for inconsistencies */
if (clength != -1 && length != -1 && clength != length) {
_http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
}
if (clength == -1)
clength = length;
if (clength != -1)
length = offset + clength;
if (length != -1 && size != -1 && length != size) {
_http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
}
if (size == -1)
size = length;
/* fill in stats */
if (us) {
us->size = size;
us->atime = us->mtime = mtime;
}
/* too far? */
if (offset > URL->offset) {
_http_seterr(HTTP_PROTOCOL_ERROR);
goto ouch;
}
/* report back real offset and size */
URL->offset = offset;
URL->length = clength;
/* wrap it up in a FILE */
if ((f = chunked ? _http_funopen(fd) : fdopen(fd, "r")) == NULL) {
_fetch_syserr();
goto ouch;
}
if (url != URL)
fetchFreeURL(url);
return f;
ouch:
if (url != URL)
fetchFreeURL(url);
if (fd != -1)
close(fd);
return NULL;
}
/*****************************************************************************
* Entry points
*/
/*
* Retrieve and stat a file by HTTP
*/
FILE *
fetchXGetHTTP(struct url *URL, struct url_stat *us, char *flags)
{
return _http_request(URL, "GET", us, flags);
}
/*
* Retrieve a file by HTTP
*/
FILE *
fetchGetHTTP(struct url *URL, char *flags)
{
return fetchXGetHTTP(URL, NULL, flags);
}
/*
* Store a file by HTTP
*/
FILE *
fetchPutHTTP(struct url *URL, char *flags)
{
warnx("fetchPutHTTP(): not implemented");
return NULL;
}
/*
* Get an HTTP document's metadata
*/
int
fetchStatHTTP(struct url *URL, struct url_stat *us, char *flags)
{
FILE *f;
if ((f = _http_request(URL, "HEAD", us, flags)) == NULL)
return -1;
fclose(f);
return 0;
}
/*
* List a directory
*/
struct url_ent *
fetchListHTTP(struct url *url, char *flags)
{
warnx("fetchListHTTP(): not implemented");
return NULL;
}
Computing file changes ...
