mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-09 20:54:40 +00:00
301 lines
7.3 KiB
C++
301 lines
7.3 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This file is not build directly. Instead, it is included in multiple
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// shared objects.
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#ifdef nsWindowsRestart_cpp
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#error "nsWindowsRestart.cpp is not a header file, and must only be included once."
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#else
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#define nsWindowsRestart_cpp
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#endif
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#include "nsUTF8Utils.h"
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#include <shellapi.h>
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// Needed for CreateEnvironmentBlock
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#include <userenv.h>
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#pragma comment(lib, "userenv.lib")
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/**
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* Get the length that the string will take and takes into account the
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* additional length if the string needs to be quoted and if characters need to
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* be escaped.
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*/
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static int ArgStrLen(const wchar_t *s)
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{
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int backslashes = 0;
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int i = wcslen(s);
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BOOL hasDoubleQuote = wcschr(s, L'"') != nullptr;
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// Only add doublequotes if the string contains a space or a tab
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BOOL addDoubleQuotes = wcspbrk(s, L" \t") != nullptr;
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if (addDoubleQuotes) {
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i += 2; // initial and final duoblequote
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}
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if (hasDoubleQuote) {
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while (*s) {
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if (*s == '\\') {
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++backslashes;
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} else {
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if (*s == '"') {
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// Escape the doublequote and all backslashes preceding the doublequote
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i += backslashes + 1;
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}
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backslashes = 0;
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}
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++s;
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}
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}
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return i;
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}
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/**
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* Copy string "s" to string "d", quoting the argument as appropriate and
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* escaping doublequotes along with any backslashes that immediately precede
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* doublequotes.
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* The CRT parses this to retrieve the original argc/argv that we meant,
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* see STDARGV.C in the MSVC CRT sources.
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*
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* @return the end of the string
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*/
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static wchar_t* ArgToString(wchar_t *d, const wchar_t *s)
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{
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int backslashes = 0;
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BOOL hasDoubleQuote = wcschr(s, L'"') != nullptr;
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// Only add doublequotes if the string contains a space or a tab
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BOOL addDoubleQuotes = wcspbrk(s, L" \t") != nullptr;
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if (addDoubleQuotes) {
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*d = '"'; // initial doublequote
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++d;
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}
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if (hasDoubleQuote) {
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int i;
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while (*s) {
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if (*s == '\\') {
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++backslashes;
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} else {
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if (*s == '"') {
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// Escape the doublequote and all backslashes preceding the doublequote
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for (i = 0; i <= backslashes; ++i) {
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*d = '\\';
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++d;
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}
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}
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backslashes = 0;
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}
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*d = *s;
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++d; ++s;
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}
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} else {
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wcscpy(d, s);
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d += wcslen(s);
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}
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if (addDoubleQuotes) {
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*d = '"'; // final doublequote
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++d;
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}
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return d;
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}
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/**
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* Creates a command line from a list of arguments. The returned
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* string is allocated with "malloc" and should be "free"d.
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*
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* argv is UTF8
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*/
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wchar_t*
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MakeCommandLine(int argc, wchar_t **argv)
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{
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int i;
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int len = 0;
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// The + 1 of the last argument handles the allocation for null termination
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for (i = 0; i < argc; ++i)
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len += ArgStrLen(argv[i]) + 1;
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// Protect against callers that pass 0 arguments
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if (len == 0)
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len = 1;
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wchar_t *s = (wchar_t*) malloc(len * sizeof(wchar_t));
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if (!s)
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return nullptr;
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wchar_t *c = s;
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for (i = 0; i < argc; ++i) {
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c = ArgToString(c, argv[i]);
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if (i + 1 != argc) {
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*c = ' ';
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++c;
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}
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}
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*c = '\0';
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return s;
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}
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/**
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* Convert UTF8 to UTF16 without using the normal XPCOM goop, which we
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* can't link to updater.exe.
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*/
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static char16_t*
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AllocConvertUTF8toUTF16(const char *arg)
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{
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// UTF16 can't be longer in units than UTF8
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int len = strlen(arg);
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char16_t *s = new char16_t[(len + 1) * sizeof(char16_t)];
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if (!s)
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return nullptr;
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ConvertUTF8toUTF16 convert(s);
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convert.write(arg, len);
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convert.write_terminator();
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return s;
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}
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static void
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FreeAllocStrings(int argc, wchar_t **argv)
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{
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while (argc) {
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--argc;
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delete [] argv[argc];
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}
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delete [] argv;
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}
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/**
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* Launch a child process with the specified arguments.
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* @note argv[0] is ignored
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* @note The form of this function that takes char **argv expects UTF-8
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*/
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BOOL
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WinLaunchChild(const wchar_t *exePath,
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int argc, wchar_t **argv,
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HANDLE userToken = nullptr,
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HANDLE *hProcess = nullptr);
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BOOL
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WinLaunchChild(const wchar_t *exePath,
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int argc, char **argv,
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HANDLE userToken,
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HANDLE *hProcess)
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{
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wchar_t** argvConverted = new wchar_t*[argc];
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if (!argvConverted)
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return FALSE;
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for (int i = 0; i < argc; ++i) {
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argvConverted[i] = reinterpret_cast<wchar_t*>(AllocConvertUTF8toUTF16(argv[i]));
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if (!argvConverted[i]) {
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FreeAllocStrings(i, argvConverted);
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return FALSE;
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}
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}
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BOOL ok = WinLaunchChild(exePath, argc, argvConverted, userToken, hProcess);
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FreeAllocStrings(argc, argvConverted);
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return ok;
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}
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BOOL
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WinLaunchChild(const wchar_t *exePath,
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int argc,
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wchar_t **argv,
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HANDLE userToken,
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HANDLE *hProcess)
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{
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wchar_t *cl;
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BOOL ok;
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cl = MakeCommandLine(argc, argv);
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if (!cl) {
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return FALSE;
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}
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STARTUPINFOW si = {0};
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si.cb = sizeof(STARTUPINFOW);
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si.lpDesktop = L"winsta0\\Default";
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PROCESS_INFORMATION pi = {0};
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if (userToken == nullptr) {
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ok = CreateProcessW(exePath,
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cl,
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nullptr, // no special security attributes
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nullptr, // no special thread attributes
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FALSE, // don't inherit filehandles
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0, // creation flags
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nullptr, // inherit my environment
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nullptr, // use my current directory
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&si,
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&pi);
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} else {
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// Create an environment block for the process we're about to start using
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// the user's token.
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LPVOID environmentBlock = nullptr;
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if (!CreateEnvironmentBlock(&environmentBlock, userToken, TRUE)) {
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environmentBlock = nullptr;
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}
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ok = CreateProcessAsUserW(userToken,
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exePath,
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cl,
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nullptr, // no special security attributes
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nullptr, // no special thread attributes
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FALSE, // don't inherit filehandles
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0, // creation flags
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environmentBlock,
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nullptr, // use my current directory
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&si,
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&pi);
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if (environmentBlock) {
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DestroyEnvironmentBlock(environmentBlock);
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}
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}
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if (ok) {
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if (hProcess) {
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*hProcess = pi.hProcess; // the caller now owns the HANDLE
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} else {
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CloseHandle(pi.hProcess);
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}
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CloseHandle(pi.hThread);
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} else {
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LPVOID lpMsgBuf = nullptr;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr,
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GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR) &lpMsgBuf,
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0,
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nullptr);
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wprintf(L"Error restarting: %s\n", lpMsgBuf ? lpMsgBuf : L"(null)");
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if (lpMsgBuf)
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LocalFree(lpMsgBuf);
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}
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free(cl);
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return ok;
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}
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