tdesktop/Telegram/SourceFiles/_other/updater_linux.cpp

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/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
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.
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In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2015 John Preston, https://desktop.telegram.org
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*/
#include <cstdio>
#include <sys/stat.h>
#include <sys/types.h>
#include <cstdlib>
#include <unistd.h>
#include <dirent.h>
#include <pwd.h>
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#include <string>
#include <deque>
#include <cstring>
#include <cerrno>
#include <algorithm>
#include <cstdarg>
#include <ctime>
#include <iostream>
using std::string;
using std::deque;
using std::cout;
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bool do_mkdir(const char *path) { // from http://stackoverflow.com/questions/675039/how-can-i-create-directory-tree-in-c-linux
struct stat statbuf;
if (stat(path, &statbuf) != 0) {
/* Directory does not exist. EEXIST for race condition */
if (mkdir(path, S_IRWXU) != 0 && errno != EEXIST) return false;
} else if (!S_ISDIR(statbuf.st_mode)) {
errno = ENOTDIR;
return false;
}
return true;
}
bool _debug = false;
string exeName, exeDir, workDir;
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FILE *_logFile = 0;
void openLog() {
if (!_debug || _logFile) return;
if (!do_mkdir((workDir + "DebugLogs").c_str())) {
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return;
}
time_t timer;
time(&timer);
struct tm *t = localtime(&timer);
static const int maxFileLen = 65536;
char logName[maxFileLen];
sprintf(logName, "%sDebugLogs/%04d%02d%02d_%02d%02d%02d_upd.txt", workDir.c_str(),
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t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
_logFile = fopen(logName, "w");
}
void closeLog() {
if (!_logFile) return;
fclose(_logFile);
_logFile = 0;
}
void writeLog(const char *format, ...) {
if (!_logFile) return;
va_list args;
va_start(args, format);
vfprintf(_logFile, format, args);
fprintf(_logFile, "\n");
fflush(_logFile);
va_end(args);
}
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bool copyFile(const char *from, const char *to) {
FILE *ffrom = fopen(from, "rb"), *fto = fopen(to, "wb");
if (!ffrom) {
if (fto) fclose(fto);
return false;
}
if (!fto) {
fclose(ffrom);
return false;
}
static const int BufSize = 65536;
char buf[BufSize];
while (size_t size = fread(buf, 1, BufSize, ffrom)) {
fwrite(buf, 1, size, fto);
}
struct stat fst; // from http://stackoverflow.com/questions/5486774/keeping-fileowner-and-permissions-after-copying-file-in-c
//let's say this wont fail since you already worked OK on that fp
if (fstat(fileno(ffrom), &fst) != 0) {
fclose(ffrom);
fclose(fto);
return false;
}
//update to the same uid/gid
if (fchown(fileno(fto), fst.st_uid, fst.st_gid) != 0) {
fclose(ffrom);
fclose(fto);
return false;
}
//update the permissions
if (fchmod(fileno(fto), fst.st_mode) != 0) {
fclose(ffrom);
fclose(fto);
return false;
}
fclose(ffrom);
fclose(fto);
return true;
}
bool remove_directory(const string &path) { // from http://stackoverflow.com/questions/2256945/removing-a-non-empty-directory-programmatically-in-c-or-c
DIR *d = opendir(path.c_str());
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writeLog("Removing dir '%s'", path.c_str());
if (!d) {
writeLog("Could not open dir '%s'", path.c_str());
return (errno == ENOENT);
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}
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while (struct dirent *p = readdir(d)) {
/* Skip the names "." and ".." as we don't want to recurse on them. */
if (!strcmp(p->d_name, ".") || !strcmp(p->d_name, "..")) continue;
string fname = path + '/' + p->d_name;
struct stat statbuf;
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writeLog("Trying to get stat() for '%s'", fname.c_str());
if (!stat(fname.c_str(), &statbuf)) {
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if (S_ISDIR(statbuf.st_mode)) {
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if (!remove_directory(fname.c_str())) {
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closedir(d);
return false;
}
} else {
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writeLog("Unlinking file '%s'", fname.c_str());
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if (unlink(fname.c_str())) {
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writeLog("Failed to unlink '%s'", fname.c_str());
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closedir(d);
return false;
}
}
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} else {
writeLog("Failed to call stat() on '%s'", fname.c_str());
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}
}
closedir(d);
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writeLog("Finally removing dir '%s'", path.c_str());
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return !rmdir(path.c_str());
}
bool mkpath(const char *path) {
int status = 0, pathsize = strlen(path) + 1;
char *copypath = new char[pathsize];
memcpy(copypath, path, pathsize);
char *pp = copypath, *sp;
while (status == 0 && (sp = strchr(pp, '/')) != 0) {
if (sp != pp) {
/* Neither root nor double slash in path */
*sp = '\0';
if (!do_mkdir(copypath)) {
delete[] copypath;
return false;
}
*sp = '/';
}
pp = sp + 1;
}
delete[] copypath;
return do_mkdir(path);
}
bool equal(string a, string b) {
std::transform(a.begin(), a.end(), a.begin(), ::tolower);
std::transform(b.begin(), b.end(), b.begin(), ::tolower);
return a == b;
}
void delFolder() {
string delPathOld = workDir + "tupdates/ready", delPath = workDir + "tupdates/temp", delFolder = workDir + "tupdates";
writeLog("Fully clearing old path '%s'..", delPathOld.c_str());
if (!remove_directory(delPathOld)) {
writeLog("Failed to clear old path! :( New path was used?..");
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}
writeLog("Fully clearing path '%s'..", delPath.c_str());
if (!remove_directory(delPath)) {
writeLog("Error: failed to clear path! :(");
}
rmdir(delFolder.c_str());
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}
bool update() {
writeLog("Update started..");
string updDir = workDir + "tupdates/temp", readyFilePath = workDir + "tupdates/temp/ready", tdataDir = workDir + "tupdates/temp/tdata";
{
FILE *readyFile = fopen(readyFilePath.c_str(), "rb");
if (readyFile) {
fclose(readyFile);
writeLog("Ready file found! Using new path '%s'..", updDir.c_str());
} else {
updDir = workDir + "tupdates/ready"; // old
tdataDir = workDir + "tupdates/ready/tdata";
writeLog("Ready file not found! Using old path '%s'..", updDir.c_str());
}
}
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deque<string> dirs;
dirs.push_back(updDir);
deque<string> from, to, forcedirs;
do {
string dir = dirs.front();
dirs.pop_front();
string toDir = exeDir;
if (dir.size() > updDir.size() + 1) {
toDir += (dir.substr(updDir.size() + 1) + '/');
forcedirs.push_back(toDir);
writeLog("Parsing dir '%s' in update tree..", toDir.c_str());
}
DIR *d = opendir(dir.c_str());
if (!d) {
writeLog("Failed to open dir %s", dir.c_str());
return false;
}
while (struct dirent *p = readdir(d)) {
/* Skip the names "." and ".." as we don't want to recurse on them. */
if (!strcmp(p->d_name, ".") || !strcmp(p->d_name, "..")) continue;
string fname = dir + '/' + p->d_name;
struct stat statbuf;
if (fname.substr(0, tdataDir.size()) == tdataDir && (fname.size() <= tdataDir.size() || fname.at(tdataDir.size()) == '/')) {
writeLog("Skipping 'tdata' path '%s'", fname.c_str());
} else if (!stat(fname.c_str(), &statbuf)) {
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if (S_ISDIR(statbuf.st_mode)) {
dirs.push_back(fname);
writeLog("Added dir '%s' in update tree..", fname.c_str());
} else {
string tofname = exeDir + fname.substr(updDir.size() + 1);
if (equal(tofname, exeName)) { // bad update - has Updater - delete all dir
writeLog("Error: bad update, has Updater! '%s' equal '%s'", tofname.c_str(), exeName.c_str());
delFolder();
return false;
}
if (fname == readyFilePath) {
writeLog("Skipped ready file '%s'", fname.c_str());
} else {
from.push_back(fname);
to.push_back(tofname);
writeLog("Added file '%s' to be copied to '%s'", fname.c_str(), tofname.c_str());
}
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}
} else {
writeLog("Could not get stat() for file %s", fname.c_str());
}
}
closedir(d);
} while (!dirs.empty());
for (size_t i = 0; i < forcedirs.size(); ++i) {
string forcedir = forcedirs[i];
writeLog("Forcing dir '%s'..", forcedir.c_str());
if (!forcedir.empty() && !mkpath(forcedir.c_str())) {
writeLog("Error: failed to create dir '%s'..", forcedir.c_str());
delFolder();
return false;
}
}
for (size_t i = 0; i < from.size(); ++i) {
string fname = from[i], tofname = to[i];
writeLog("Copying file '%s' to '%s'..", fname.c_str(), tofname.c_str());
int copyTries = 0, triesLimit = 30;
do {
if (!copyFile(fname.c_str(), tofname.c_str())) {
++copyTries;
usleep(100000);
} else {
break;
}
} while (copyTries < triesLimit);
if (copyTries == triesLimit) {
writeLog("Error: failed to copy, asking to retry..");
delFolder();
return false;
}
}
writeLog("Update succeed! Clearing folder..");
delFolder();
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return true;
}
int main(int argc, char *argv[]) {
bool needupdate = true, autostart = false, debug = false, tosettings = false, startintray = false, testmode = false;
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char *key = 0;
for (int i = 1; i < argc; ++i) {
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if (equal(argv[i], "-noupdate")) {
needupdate = false;
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} else if (equal(argv[i], "-autostart")) {
autostart = true;
} else if (equal(argv[i], "-debug")) {
debug = _debug = true;
} else if (equal(argv[i], "-startintray")) {
startintray = true;
} else if (equal(argv[i], "-testmode")) {
testmode = true;
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} else if (equal(argv[i], "-tosettings")) {
tosettings = true;
} else if (equal(argv[i], "-key") && ++i < argc) {
key = argv[i];
} else if (equal(argv[i], "-workpath") && ++i < argc) {
workDir = argv[i];
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}
}
openLog();
writeLog("Updater started..");
for (int i = 0; i < argc; ++i) {
writeLog("Argument: '%s'", argv[i]);
}
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if (needupdate) writeLog("Need to update!");
if (autostart) writeLog("From autostart!");
exeName = argv[0];
writeLog("Exe name is: %s", exeName.c_str());
if (exeName.size() >= 7) {
if (equal(exeName.substr(exeName.size() - 7), "Updater")) {
exeDir = exeName.substr(0, exeName.size() - 7);
writeLog("Exe dir is: %s", exeDir.c_str());
if (needupdate) {
if (workDir.empty()) { // old app launched, update prepared in tupdates/ready (not in tupdates/temp)
writeLog("No workdir, trying to figure it out");
struct passwd *pw = getpwuid(getuid());
if (pw && pw->pw_dir && strlen(pw->pw_dir)) {
string tryDir = pw->pw_dir + string("/.TelegramDesktop/");
struct stat statbuf;
writeLog("Trying to use '%s' as workDir, getting stat() for tupdates/ready", tryDir.c_str());
if (!stat((tryDir + "tupdates/ready").c_str(), &statbuf)) {
writeLog("Stat got");
if (S_ISDIR(statbuf.st_mode)) {
writeLog("It is directory, using home work dir");
workDir = tryDir;
}
}
}
if (workDir.empty()) {
workDir = exeDir;
struct stat statbuf;
writeLog("Trying to use current as workDir, getting stat() for tupdates/ready");
if (!stat("tupdates/ready", &statbuf)) {
writeLog("Stat got");
if (S_ISDIR(statbuf.st_mode)) {
writeLog("It is directory, using current dir");
workDir = string();
}
}
}
} else {
writeLog("Passed workpath is '%s'", workDir.c_str());
}
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update();
}
} else {
writeLog("Error: bad exe name!");
}
} else {
writeLog("Error: short exe name!");
}
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static const int MaxLen = 65536, MaxArgsCount = 128;
char path[MaxLen] = {0};
strcpy(path, (exeDir + "Telegram").c_str());
char *args[MaxArgsCount] = {0}, p_noupdate[] = "-noupdate", p_autostart[] = "-autostart", p_debug[] = "-debug", p_tosettings[] = "-tosettings", p_key[] = "-key", p_startintray[] = "-startintray", p_testmode[] = "-testmode";
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int argIndex = 0;
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args[argIndex++] = path;
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args[argIndex++] = p_noupdate;
if (autostart) args[argIndex++] = p_autostart;
if (debug) args[argIndex++] = p_debug;
if (startintray) args[argIndex++] = p_startintray;
if (testmode) args[argIndex++] = p_testmode;
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if (tosettings) args[argIndex++] = p_tosettings;
if (key) {
args[argIndex++] = p_key;
args[argIndex++] = key;
}
pid_t pid = fork();
switch (pid) {
case -1: writeLog("fork() failed!"); return 1;
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case 0: execv(path, args); return 1;
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}
writeLog("Executed Telegram, closing log and quiting..");
closeLog();
return 0;
}