tdesktop/Telegram/SourceFiles/_other/updater_linux.cpp

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
#include <cstdio>
#include <sys/stat.h>
#include <sys/types.h>
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#include <sys/sendfile.h>
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#include <cstdlib>
#include <unistd.h>
#include <dirent.h>
#include <pwd.h>
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#include <string>
#include <deque>
#include <vector>
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#include <cstring>
#include <cerrno>
#include <algorithm>
#include <cstdarg>
#include <ctime>
#include <iostream>
using std::string;
using std::deque;
using std::vector;
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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;
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}
bool _debug = false;
string updaterDir;
string updaterName;
string workDir;
string exeName;
string exePath;
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FILE *_logFile = 0;
void openLog() {
if (!_debug || _logFile) return;
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if (!do_mkdir((workDir + "DebugLogs").c_str())) {
return;
}
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time_t timer;
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time(&timer);
struct tm *t = localtime(&timer);
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static const int maxFileLen = 65536;
char logName[maxFileLen];
sprintf(logName, "%sDebugLogs/%04d%02d%02d_%02d%02d%02d_upd.txt", workDir.c_str(),
t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
_logFile = fopen(logName, "w");
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}
void closeLog() {
if (!_logFile) return;
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fclose(_logFile);
_logFile = 0;
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}
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, bool writeprotected) {
FILE *ffrom = fopen(from, "rb"), *fto = fopen(to, "wb");
if (!ffrom) {
if (fto) fclose(fto);
return false;
}
if (!fto) {
fclose(ffrom);
return false;
}
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;
}
ssize_t copied = sendfile(
fileno(fto),
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fileno(ffrom),
nullptr,
fst.st_size);
if (copied == -1) {
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writeLog(
"Copy by sendfile '%s' to '%s' failed, error: %d, fallback now.",
from,
to,
int(errno));
static const int BufSize = 65536;
char buf[BufSize];
while (size_t size = fread(buf, 1, BufSize, ffrom)) {
fwrite(buf, 1, size, fto);
}
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} else {
writeLog(
"Copy by sendfile '%s' to '%s' done, size: %d, result: %d.",
from,
to,
int(fst.st_size),
int(copied));
}
//update to the same uid/gid
if (!writeprotected && 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;
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}
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());
writeLog("Removing dir '%s'", path.c_str());
if (!d) {
writeLog("Could not open dir '%s'", path.c_str());
return (errno == ENOENT);
}
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;
writeLog("Trying to get stat() for '%s'", fname.c_str());
if (!stat(fname.c_str(), &statbuf)) {
if (S_ISDIR(statbuf.st_mode)) {
if (!remove_directory(fname.c_str())) {
closedir(d);
return false;
}
} else {
writeLog("Unlinking file '%s'", fname.c_str());
if (unlink(fname.c_str())) {
writeLog("Failed to unlink '%s'", fname.c_str());
closedir(d);
return false;
}
}
} else {
writeLog("Failed to call stat() on '%s'", fname.c_str());
}
}
closedir(d);
writeLog("Finally removing dir '%s'", path.c_str());
return !rmdir(path.c_str());
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}
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);
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}
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;
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}
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?..");
}
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(bool writeprotected) {
writeLog("Update started..");
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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;
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dirs.push_back(updDir);
deque<string> from, to, forcedirs;
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do {
string dir = dirs.front();
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dirs.pop_front();
string toDir = exePath;
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if (dir.size() > updDir.size() + 1) {
toDir += (dir.substr(updDir.size() + 1) + '/');
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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;
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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 = 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)) {
if (S_ISDIR(statbuf.st_mode)) {
dirs.push_back(fname);
writeLog("Added dir '%s' in update tree..", fname.c_str());
} else {
string tofname = exePath + fname.substr(updDir.size() + 1);
if (equal(tofname, updaterName)) { // bad update - has Updater - delete all dir
writeLog("Error: bad update, has Updater! '%s' equal '%s'", tofname.c_str(), updaterName.c_str());
delFolder();
return false;
} else if (equal(tofname, exePath + "Telegram") && exeName != "Telegram") {
string fullBinaryPath = exePath + exeName;
writeLog("Target binary found: '%s', changing to '%s'", tofname.c_str(), fullBinaryPath.c_str());
tofname = fullBinaryPath;
}
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());
}
}
} else {
writeLog("Could not get stat() for file %s", fname.c_str());
}
}
closedir(d);
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} 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;
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}
}
for (size_t i = 0; i < from.size(); ++i) {
string fname = from[i], tofname = to[i];
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// it is necessary to remove the old file to not to get an error if appimage file is used by fuse
struct stat statbuf;
writeLog("Trying to get stat() for '%s'", tofname.c_str());
if (!stat(tofname.c_str(), &statbuf)) {
if (S_ISDIR(statbuf.st_mode)) {
writeLog("Fully clearing path '%s'..", tofname.c_str());
if (!remove_directory(tofname.c_str())) {
writeLog("Error: failed to clear path '%s'", tofname.c_str());
delFolder();
return false;
}
} else {
writeLog("Unlinking file '%s'", tofname.c_str());
if (unlink(tofname.c_str())) {
writeLog("Error: failed to unlink '%s'", tofname.c_str());
delFolder();
return false;
}
}
}
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(), writeprotected)) {
++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;
}
string CurrentExecutablePath(int argc, char *argv[]) {
constexpr auto kMaxPath = 1024;
char result[kMaxPath] = { 0 };
auto count = readlink("/proc/self/exe", result, kMaxPath);
if (count > 0) {
return string(result);
}
// Fallback to the first command line argument.
return argc ? string(argv[0]) : string();
}
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int main(int argc, char *argv[]) {
bool needupdate = true;
bool autostart = false;
bool debug = false;
bool writeprotected = false;
bool tosettings = false;
bool startintray = false;
bool customWorkingDir = false;
char *key = 0;
char *workdir = 0;
for (int i = 1; i < argc; ++i) {
if (equal(argv[i], "-noupdate")) {
needupdate = false;
} 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], "-tosettings")) {
tosettings = true;
} else if (equal(argv[i], "-workdir_custom")) {
customWorkingDir = true;
} else if (equal(argv[i], "-writeprotected")) {
writeprotected = true;
} else if (equal(argv[i], "-key") && ++i < argc) {
key = argv[i];
} else if (equal(argv[i], "-workpath") && ++i < argc) {
workDir = workdir = argv[i];
} else if (equal(argv[i], "-exename") && ++i < argc) {
exeName = argv[i];
} else if (equal(argv[i], "-exepath") && ++i < argc) {
exePath = argv[i];
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}
}
if (exeName.empty() || exeName.find('/') != string::npos) {
exeName = "Telegram";
}
openLog();
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writeLog("Updater started, new argments formatting..");
for (int i = 0; i < argc; ++i) {
writeLog("Argument: '%s'", argv[i]);
}
if (needupdate) writeLog("Need to update!");
if (autostart) writeLog("From autostart!");
if (writeprotected) writeLog("Write Protected folder!");
updaterName = CurrentExecutablePath(argc, argv);
writeLog("Updater binary full path is: %s", updaterName.c_str());
if (exePath.empty()) {
writeLog("Executable path is not specified :(");
} else {
writeLog("Executable path: %s", exePath.c_str());
}
if (updaterName.size() >= 7) {
if (equal(updaterName.substr(updaterName.size() - 7), "Updater")) {
updaterDir = updaterName.substr(0, updaterName.size() - 7);
writeLog("Updater binary dir is: %s", updaterDir.c_str());
if (exePath.empty()) {
exePath = updaterDir;
writeLog("Using updater binary dir.", exePath.c_str());
}
if (needupdate) {
if (workDir.empty()) { // old app launched, update prepared in tupdates/ready (not in tupdates/temp)
customWorkingDir = false;
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 = exePath;
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());
}
update(writeprotected);
}
} else {
writeLog("Error: bad exe name!");
}
} else {
writeLog("Error: short exe name!");
}
auto fullBinaryPath = exePath + exeName;
const auto path = fullBinaryPath.c_str();
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auto values = vector<string>();
const auto push = [&](string arg) {
// Force null-terminated .data() call result.
values.push_back(arg + char(0));
};
push(path);
push("-noupdate");
if (autostart) push("-autostart");
if (debug) push("-debug");
if (startintray) push("-startintray");
if (tosettings) push("-tosettings");
if (key) {
push("-key");
push(key);
}
if (customWorkingDir && workdir) {
push("-workdir");
push(workdir);
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}
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auto args = vector<char*>();
for (auto &arg : values) {
args.push_back(arg.data());
}
args.push_back(nullptr);
// let the parent launch instead
if (!writeprotected) {
pid_t pid = fork();
switch (pid) {
case -1:
writeLog("fork() failed!");
return 1;
case 0:
execv(args[0], args.data());
return 1;
}
}
writeLog("Executed Telegram, closing log and quitting..");
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closeLog();
return 0;
}