transmission/libtransmission/platform.cc

595 lines
15 KiB
C++

// This file Copyright © 2009-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm>
#include <cstdarg>
#include <cstring>
#include <list>
#include <string>
#include <string_view>
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600 /* needed for recursive locks. */
#endif
#ifndef __USE_UNIX98
#define __USE_UNIX98 /* some older Linuxes need it spelt out for them */
#endif
#ifdef __HAIKU__
#include <limits.h> /* PATH_MAX */
#endif
#ifdef _WIN32
#include <process.h> /* _beginthreadex(), _endthreadex() */
#include <windows.h>
#include <shlobj.h> /* SHGetKnownFolderPath(), FOLDERID_... */
#else
#include <unistd.h> /* getuid() */
#ifdef BUILD_MAC_CLIENT
#include <CoreFoundation/CoreFoundation.h>
#endif
#ifdef __HAIKU__
#include <FindDirectory.h>
#endif
#include <pthread.h>
#endif
#include "transmission.h"
#include "file.h"
#include "log.h"
#include "platform.h"
#include "session.h"
#include "tr-assert.h"
#include "utils.h"
using namespace std::literals;
static char* tr_buildPath(char const* first_element, ...)
{
// pass 1: allocate enough space for the string
va_list vl;
va_start(vl, first_element);
auto bufLen = size_t{};
for (char const* element = first_element; element != nullptr;)
{
bufLen += strlen(element) + 1;
element = va_arg(vl, char const*);
}
va_end(vl);
auto* const buf = tr_new(char, bufLen);
if (buf == nullptr)
{
return nullptr;
}
/* pass 2: build the string piece by piece */
char* pch = buf;
va_start(vl, first_element);
for (char const* element = first_element; element != nullptr;)
{
size_t const elementLen = strlen(element);
pch = std::copy_n(element, elementLen, pch);
*pch++ = TR_PATH_DELIMITER;
element = va_arg(vl, char const*);
}
va_end(vl);
// if nonempty, eat the unwanted trailing slash
if (pch != buf)
{
--pch;
}
// zero-terminate the string
*pch++ = '\0';
/* sanity checks & return */
TR_ASSERT(pch - buf == (ptrdiff_t)bufLen);
return buf;
}
/***
**** THREADS
***/
#ifdef _WIN32
using tr_thread_id = DWORD;
#else
using tr_thread_id = pthread_t;
#endif
static tr_thread_id tr_getCurrentThread()
{
#ifdef _WIN32
return GetCurrentThreadId();
#else
return pthread_self();
#endif
}
static bool tr_areThreadsEqual(tr_thread_id a, tr_thread_id b)
{
#ifdef _WIN32
return a == b;
#else
return pthread_equal(a, b) != 0;
#endif
}
/** @brief portability wrapper around OS-dependent threads */
struct tr_thread
{
void (*func)(void*);
void* arg;
tr_thread_id thread;
#ifdef _WIN32
HANDLE thread_handle;
#endif
};
bool tr_amInThread(tr_thread const* t)
{
return tr_areThreadsEqual(tr_getCurrentThread(), t->thread);
}
#ifdef _WIN32
#define ThreadFuncReturnType unsigned WINAPI
#else
#define ThreadFuncReturnType void*
#endif
static ThreadFuncReturnType ThreadFunc(void* _t)
{
#ifndef _WIN32
pthread_detach(pthread_self());
#endif
auto* t = static_cast<tr_thread*>(_t);
t->func(t->arg);
tr_free(t);
#ifdef _WIN32
_endthreadex(0);
return 0;
#else
return nullptr;
#endif
}
tr_thread* tr_threadNew(void (*func)(void*), void* arg)
{
auto* t = static_cast<tr_thread*>(tr_new0(tr_thread, 1));
t->func = func;
t->arg = arg;
#ifdef _WIN32
{
unsigned int id;
t->thread_handle = (HANDLE)_beginthreadex(nullptr, 0, &ThreadFunc, t, 0, &id);
t->thread = (DWORD)id;
}
#else
pthread_create(&t->thread, nullptr, (void* (*)(void*))ThreadFunc, t);
#endif
return t;
}
/***
**** PATHS
***/
#ifndef _WIN32
#include <pwd.h>
#endif
#ifdef _WIN32
static char* win32_get_known_folder_ex(REFKNOWNFOLDERID folder_id, DWORD flags)
{
char* ret = nullptr;
PWSTR path;
if (SHGetKnownFolderPath(folder_id, flags | KF_FLAG_DONT_UNEXPAND, nullptr, &path) == S_OK)
{
ret = tr_win32_native_to_utf8(path, -1);
CoTaskMemFree(path);
}
return ret;
}
static char* win32_get_known_folder(REFKNOWNFOLDERID folder_id)
{
return win32_get_known_folder_ex(folder_id, KF_FLAG_DONT_VERIFY);
}
#endif
static char const* getHomeDir()
{
static char const* home = nullptr;
if (home == nullptr)
{
home = tr_env_get_string("HOME", nullptr);
if (home == nullptr)
{
#ifdef _WIN32
home = win32_get_known_folder(FOLDERID_Profile);
#else
struct passwd pwent;
struct passwd* pw = nullptr;
char buf[4096];
getpwuid_r(getuid(), &pwent, buf, sizeof buf, &pw);
if (pw != nullptr)
{
home = tr_strdup(pw->pw_dir);
}
#endif
}
if (home == nullptr)
{
home = tr_strdup("");
}
}
return home;
}
void tr_setConfigDir(tr_session* session, std::string_view config_dir)
{
#if defined(__APPLE__) || defined(_WIN32)
auto constexpr ResumeSubdir = "Resume"sv;
auto constexpr TorrentSubdir = "Torrents"sv;
#else
auto constexpr ResumeSubdir = "resume"sv;
auto constexpr TorrentSubdir = "torrents"sv;
#endif
session->config_dir = config_dir;
session->resume_dir = tr_strvPath(config_dir, ResumeSubdir);
session->torrent_dir = tr_strvPath(config_dir, TorrentSubdir);
tr_sys_dir_create(session->resume_dir.c_str(), TR_SYS_DIR_CREATE_PARENTS, 0777, nullptr);
tr_sys_dir_create(session->torrent_dir.c_str(), TR_SYS_DIR_CREATE_PARENTS, 0777, nullptr);
}
char const* tr_sessionGetConfigDir(tr_session const* session)
{
return session->config_dir.c_str();
}
char const* tr_getTorrentDir(tr_session const* session)
{
return session->torrent_dir.c_str();
}
char const* tr_getResumeDir(tr_session const* session)
{
return session->resume_dir.c_str();
}
char const* tr_getDefaultConfigDir(char const* appname)
{
static char const* s = nullptr;
if (tr_str_is_empty(appname))
{
appname = "Transmission";
}
if (s == nullptr)
{
s = tr_env_get_string("TRANSMISSION_HOME", nullptr);
if (s == nullptr)
{
#ifdef __APPLE__
s = tr_buildPath(getHomeDir(), "Library", "Application Support", appname, nullptr);
#elif defined(_WIN32)
char* appdata = win32_get_known_folder(FOLDERID_LocalAppData);
s = tr_buildPath(appdata, appname, nullptr);
tr_free(appdata);
#elif defined(__HAIKU__)
char buf[PATH_MAX];
find_directory(B_USER_SETTINGS_DIRECTORY, -1, true, buf, sizeof(buf));
s = tr_buildPath(buf, appname, nullptr);
#else
char* const xdg_config_home = tr_env_get_string("XDG_CONFIG_HOME", nullptr);
if (xdg_config_home != nullptr)
{
s = tr_buildPath(xdg_config_home, appname, nullptr);
tr_free(xdg_config_home);
}
else
{
s = tr_buildPath(getHomeDir(), ".config", appname, nullptr);
}
#endif
}
}
return s;
}
static std::string getUserDirsFilename()
{
char* const config_home = tr_env_get_string("XDG_CONFIG_HOME", nullptr);
auto config_file = !tr_str_is_empty(config_home) ? tr_strvPath(config_home, "user-dirs.dirs") :
tr_strvPath(getHomeDir(), ".config", "user-dirs.dirs");
tr_free(config_home);
return config_file;
}
static std::string getXdgEntryFromUserDirs(std::string_view key)
{
auto content = std::vector<char>{};
if (!tr_loadFile(content, getUserDirsFilename()) && std::empty(content))
{
return {};
}
// search for key="val" and extract val
auto const search = tr_strvJoin(key, "=\""sv);
auto begin = std::search(std::begin(content), std::end(content), std::begin(search), std::end(search));
if (begin == std::end(content))
{
return {};
}
std::advance(begin, std::size(search));
auto const end = std::find(begin, std::end(content), '"');
if (end == std::end(content))
{
return {};
}
auto val = std::string{ begin, end };
// if val contains "$HOME", replace that with getHomeDir()
auto constexpr Home = "$HOME"sv;
auto const it = std::search(std::begin(val), std::end(val), std::begin(Home), std::end(Home));
if (it != std::end(val))
{
val.replace(it, it + std::size(Home), std::string_view{ getHomeDir() });
}
return val;
}
char const* tr_getDefaultDownloadDir()
{
static char const* user_dir = nullptr;
if (user_dir == nullptr)
{
auto const xdg_user_dir = getXdgEntryFromUserDirs("XDG_DOWNLOAD_DIR"sv);
if (!std::empty(xdg_user_dir))
{
user_dir = tr_strvDup(xdg_user_dir);
}
#ifdef _WIN32
if (user_dir == nullptr)
{
user_dir = win32_get_known_folder(FOLDERID_Downloads);
}
#endif
if (user_dir == nullptr)
{
#ifdef __HAIKU__
user_dir = tr_buildPath(getHomeDir(), "Desktop", nullptr);
#else
user_dir = tr_buildPath(getHomeDir(), "Downloads", nullptr);
#endif
}
}
return user_dir;
}
/***
****
***/
static bool isWebClientDir(std::string_view path)
{
auto tmp = tr_strvPath(path, "index.html");
bool const ret = tr_sys_path_exists(tmp.c_str(), nullptr);
tr_logAddInfo(_("Searching for web interface file \"%s\""), tmp.c_str());
return ret;
}
char const* tr_getWebClientDir([[maybe_unused]] tr_session const* session)
{
static char const* s = nullptr;
if (s == nullptr)
{
s = tr_env_get_string("CLUTCH_HOME", nullptr);
if (s == nullptr)
{
s = tr_env_get_string("TRANSMISSION_WEB_HOME", nullptr);
}
if (s == nullptr)
{
#ifdef BUILD_MAC_CLIENT /* on Mac, look in the Application Support folder first, then in the app bundle. */
/* Look in the Application Support folder */
s = tr_buildPath(tr_sessionGetConfigDir(session), "public_html", nullptr);
if (!isWebClientDir(s))
{
tr_free(const_cast<char*>(s));
CFURLRef appURL = CFBundleCopyBundleURL(CFBundleGetMainBundle());
CFStringRef appRef = CFURLCopyFileSystemPath(appURL, kCFURLPOSIXPathStyle);
CFIndex const appStringLength = CFStringGetMaximumSizeOfFileSystemRepresentation(appRef);
char* appString = static_cast<char*>(tr_malloc(appStringLength));
bool const success = CFStringGetFileSystemRepresentation(appRef, appString, appStringLength);
TR_ASSERT(success);
CFRelease(appURL);
CFRelease(appRef);
/* Fallback to the app bundle */
s = tr_buildPath(appString, "Contents", "Resources", "public_html", nullptr);
if (!isWebClientDir(s))
{
tr_free(const_cast<char*>(s));
s = nullptr;
}
tr_free(appString);
}
#elif defined(_WIN32)
/* Generally, Web interface should be stored in a Web subdir of
* calling executable dir. */
static KNOWNFOLDERID const* const known_folder_ids[] = {
&FOLDERID_LocalAppData,
&FOLDERID_RoamingAppData,
&FOLDERID_ProgramData,
};
for (size_t i = 0; s == nullptr && i < TR_N_ELEMENTS(known_folder_ids); ++i)
{
char* dir = win32_get_known_folder(*known_folder_ids[i]);
char* path = tr_buildPath(dir, "Transmission", "Web", nullptr);
tr_free(dir);
if (isWebClientDir(path))
{
s = path;
}
else
{
tr_free(path);
}
}
if (s == nullptr) /* check calling module place */
{
wchar_t wide_module_path[MAX_PATH];
GetModuleFileNameW(nullptr, wide_module_path, TR_N_ELEMENTS(wide_module_path));
char* module_path = tr_win32_native_to_utf8(wide_module_path, -1);
char* dir = tr_sys_path_dirname(module_path, nullptr);
tr_free(module_path);
if (dir != nullptr)
{
char* path = tr_buildPath(dir, "Web", nullptr);
tr_free(dir);
if (isWebClientDir(path))
{
s = path;
}
else
{
tr_free(path);
}
}
}
#else /* everyone else, follow the XDG spec */
auto candidates = std::list<std::string>{};
/* XDG_DATA_HOME should be the first in the list of candidates */
char* tmp = tr_env_get_string("XDG_DATA_HOME", nullptr);
if (!tr_str_is_empty(tmp))
{
candidates.emplace_back(tmp);
}
else
{
candidates.emplace_back(tr_strvPath(getHomeDir(), ".local"sv, "share"sv));
}
tr_free(tmp);
/* XDG_DATA_DIRS are the backup directories */
{
char const* const pkg = PACKAGE_DATA_DIR;
auto* xdg = tr_env_get_string("XDG_DATA_DIRS", "");
auto const buf = tr_strvJoin(pkg, ":", xdg, ":/usr/local/share:/usr/share");
tr_free(xdg);
auto sv = std::string_view{ buf };
auto token = std::string_view{};
while (tr_strvSep(&sv, &token, ':'))
{
token = tr_strvStrip(token);
if (!std::empty(token))
{
candidates.emplace_back(token);
}
}
}
/* walk through the candidates & look for a match */
for (auto const& dir : candidates)
{
auto const path = tr_strvPath(dir, "transmission"sv, "public_html"sv);
if (isWebClientDir(path))
{
s = tr_strvDup(path);
break;
}
}
#endif
}
}
return s;
}
std::string tr_getSessionIdDir()
{
#ifndef _WIN32
return std::string{ "/tmp"sv };
#else
char* program_data_dir = win32_get_known_folder_ex(FOLDERID_ProgramData, KF_FLAG_CREATE);
auto const result = tr_strvPath(program_data_dir, "Transmission");
tr_free(program_data_dir);
tr_sys_dir_create(result.c_str(), 0, 0, nullptr);
return result;
#endif
}