gecko/toolkit/xre/nsWindowsRestart.cpp
2013-10-10 16:36:42 -04:00

301 lines
7.3 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// 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>
// Needed for CreateEnvironmentBlock
#include <userenv.h>
#pragma comment(lib, "userenv.lib")
/**
* 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'"') != nullptr;
// Only add doublequotes if the string contains a space or a tab
BOOL addDoubleQuotes = wcspbrk(s, L" \t") != nullptr;
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'"') != nullptr;
// Only add doublequotes if the string contains a space or a tab
BOOL addDoubleQuotes = wcspbrk(s, L" \t") != nullptr;
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
*/
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 nullptr;
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 nullptr;
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,
HANDLE userToken = nullptr,
HANDLE *hProcess = nullptr);
BOOL
WinLaunchChild(const PRUnichar *exePath,
int argc, char **argv,
HANDLE userToken,
HANDLE *hProcess)
{
PRUnichar** argvConverted = new PRUnichar*[argc];
if (!argvConverted)
return FALSE;
for (int i = 0; i < argc; ++i) {
argvConverted[i] = AllocConvertUTF8toUTF16(argv[i]);
if (!argvConverted[i]) {
FreeAllocStrings(i, argvConverted);
return FALSE;
}
}
BOOL ok = WinLaunchChild(exePath, argc, argvConverted, userToken, hProcess);
FreeAllocStrings(argc, argvConverted);
return ok;
}
BOOL
WinLaunchChild(const PRUnichar *exePath,
int argc,
PRUnichar **argv,
HANDLE userToken,
HANDLE *hProcess)
{
PRUnichar *cl;
BOOL ok;
cl = MakeCommandLine(argc, argv);
if (!cl) {
return FALSE;
}
STARTUPINFOW si = {0};
si.cb = sizeof(STARTUPINFOW);
si.lpDesktop = L"winsta0\\Default";
PROCESS_INFORMATION pi = {0};
if (userToken == nullptr) {
ok = CreateProcessW(exePath,
cl,
nullptr, // no special security attributes
nullptr, // no special thread attributes
FALSE, // don't inherit filehandles
0, // creation flags
nullptr, // inherit my environment
nullptr, // use my current directory
&si,
&pi);
} else {
// Create an environment block for the process we're about to start using
// the user's token.
LPVOID environmentBlock = nullptr;
if (!CreateEnvironmentBlock(&environmentBlock, userToken, TRUE)) {
environmentBlock = nullptr;
}
ok = CreateProcessAsUserW(userToken,
exePath,
cl,
nullptr, // no special security attributes
nullptr, // no special thread attributes
FALSE, // don't inherit filehandles
0, // creation flags
environmentBlock,
nullptr, // use my current directory
&si,
&pi);
if (environmentBlock) {
DestroyEnvironmentBlock(environmentBlock);
}
}
if (ok) {
if (hProcess) {
*hProcess = pi.hProcess; // the caller now owns the HANDLE
} else {
CloseHandle(pi.hProcess);
}
CloseHandle(pi.hThread);
} else {
LPVOID lpMsgBuf = nullptr;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
nullptr);
wprintf(L"Error restarting: %s\n", lpMsgBuf ? lpMsgBuf : L"(null)");
if (lpMsgBuf)
LocalFree(lpMsgBuf);
}
free(cl);
return ok;
}