nsWindowsRestart.cpp
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla XULRunner bootstrap.
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg <benjamin@smedbergs.us>.
*
* Portions created by the Initial Developer are Copyright (C) 2005
* the Mozilla Foundation. All Rights Reserved.
*
* Contributor(s):
* Robert Strong <robert.bugzilla@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// This file is not build directly. Instead, it is included in multiple
// shared objects.
#ifdef nsWindowsRestart_cpp
#error "nsWindowsRestart.cpp is not a header file, and must only be included once."
#else
#define nsWindowsRestart_cpp
#endif
#include "nsUTF8Utils.h"
#include <shellapi.h>
#ifndef ERROR_ELEVATION_REQUIRED
#define ERROR_ELEVATION_REQUIRED 740L
#endif
BOOL (WINAPI *pCreateProcessWithTokenW)(HANDLE,
DWORD,
LPCWSTR,
LPWSTR,
DWORD,
LPVOID,
LPCWSTR,
LPSTARTUPINFOW,
LPPROCESS_INFORMATION);
BOOL (WINAPI *pIsUserAnAdmin)(VOID);
/**
* Get the length that the string will take and takes into account the
* additional length if the string needs to be quoted and if characters need to
* be escaped.
*/
static int ArgStrLen(const PRUnichar *s)
{
int backslashes = 0;
int i = wcslen(s);
BOOL hasDoubleQuote = wcschr(s, L'"') != NULL;
// Only add doublequotes if the string contains a space or a tab
BOOL addDoubleQuotes = wcspbrk(s, L" \t") != NULL;
if (addDoubleQuotes) {
i += 2; // initial and final duoblequote
}
if (hasDoubleQuote) {
while (*s) {
if (*s == '\\') {
++backslashes;
} else {
if (*s == '"') {
// Escape the doublequote and all backslashes preceding the doublequote
i += backslashes + 1;
}
backslashes = 0;
}
++s;
}
}
return i;
}
/**
* Copy string "s" to string "d", quoting the argument as appropriate and
* escaping doublequotes along with any backslashes that immediately precede
* doublequotes.
* The CRT parses this to retrieve the original argc/argv that we meant,
* see STDARGV.C in the MSVC CRT sources.
*
* @return the end of the string
*/
static PRUnichar* ArgToString(PRUnichar *d, const PRUnichar *s)
{
int backslashes = 0;
BOOL hasDoubleQuote = wcschr(s, L'"') != NULL;
// Only add doublequotes if the string contains a space or a tab
BOOL addDoubleQuotes = wcspbrk(s, L" \t") != NULL;
if (addDoubleQuotes) {
*d = '"'; // initial doublequote
++d;
}
if (hasDoubleQuote) {
int i;
while (*s) {
if (*s == '\\') {
++backslashes;
} else {
if (*s == '"') {
// Escape the doublequote and all backslashes preceding the doublequote
for (i = 0; i <= backslashes; ++i) {
*d = '\\';
++d;
}
}
backslashes = 0;
}
*d = *s;
++d; ++s;
}
} else {
wcscpy(d, s);
d += wcslen(s);
}
if (addDoubleQuotes) {
*d = '"'; // final doublequote
++d;
}
return d;
}
/**
* Creates a command line from a list of arguments. The returned
* string is allocated with "malloc" and should be "free"d.
*
* argv is UTF8
*/
static PRUnichar*
MakeCommandLine(int argc, PRUnichar **argv)
{
int i;
int len = 0;
// The + 1 of the last argument handles the allocation for null termination
for (i = 0; i < argc; ++i)
len += ArgStrLen(argv[i]) + 1;
// Protect against callers that pass 0 arguments
if (len == 0)
len = 1;
PRUnichar *s = (PRUnichar*) malloc(len * sizeof(PRUnichar));
if (!s)
return NULL;
PRUnichar *c = s;
for (i = 0; i < argc; ++i) {
c = ArgToString(c, argv[i]);
if (i + 1 != argc) {
*c = ' ';
++c;
}
}
*c = '\0';
return s;
}
/**
* Convert UTF8 to UTF16 without using the normal XPCOM goop, which we
* can't link to updater.exe.
*/
static PRUnichar*
AllocConvertUTF8toUTF16(const char *arg)
{
// UTF16 can't be longer in units than UTF8
int len = strlen(arg);
PRUnichar *s = new PRUnichar[(len + 1) * sizeof(PRUnichar)];
if (!s)
return NULL;
ConvertUTF8toUTF16 convert(s);
convert.write(arg, len);
convert.write_terminator();
return s;
}
static void
FreeAllocStrings(int argc, PRUnichar **argv)
{
while (argc) {
--argc;
delete [] argv[argc];
}
delete [] argv;
}
/**
* Launch a child process with the specified arguments.
* @note argv[0] is ignored
* @note The form of this function that takes char **argv expects UTF-8
*/
BOOL
WinLaunchChild(const PRUnichar *exePath, int argc, PRUnichar **argv);
BOOL
WinLaunchChild(const PRUnichar *exePath, int argc, char **argv)
{
PRUnichar** argvConverted = new PRUnichar*[argc];
if (!argvConverted)
return FALSE;
for (int i = 0; i < argc; ++i) {
argvConverted[i] = AllocConvertUTF8toUTF16(argv[i]);
if (!argvConverted[i]) {
return FALSE;
}
}
BOOL ok = WinLaunchChild(exePath, argc, argvConverted);
FreeAllocStrings(argc, argvConverted);
return ok;
}
BOOL
WinLaunchChild(const PRUnichar *exePath, int argc, PRUnichar **argv)
{
PRUnichar *cl;
BOOL ok;
cl = MakeCommandLine(argc, argv);
if (!cl)
return FALSE;
STARTUPINFOW si = {sizeof(si), 0};
PROCESS_INFORMATION pi = {0};
ok = CreateProcessW(exePath,
cl,
NULL, // no special security attributes
NULL, // no special thread attributes
FALSE, // don't inherit filehandles
0, // No special process creation flags
NULL, // inherit my environment
NULL, // use my current directory
&si,
&pi);
if (ok) {
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
} else {
LPVOID lpMsgBuf = NULL;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL
);
wprintf(L"Error restarting: %s\n", lpMsgBuf ? lpMsgBuf : L"(null)");
if (lpMsgBuf)
LocalFree(lpMsgBuf);
}
free(cl);
return ok;
}
