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transmission/libtransmission/platform.cc

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// This file Copyright © 2009-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm>
#include <cstring>
#include <list>
#include <string>
#include <string_view>
#include <thread>
#include <vector>
#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 <pwd.h>
#include <unistd.h> /* getuid() */
#endif
#ifdef BUILD_MAC_CLIENT
#include <CoreFoundation/CoreFoundation.h>
#endif
#ifdef __HAIKU__
#include <FindDirectory.h>
#endif
#include <fmt/format.h>
#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;
/***
**** PATHS
***/
#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);
}
#ifdef _WIN32
if (home == nullptr)
{
home = win32_get_known_folder(FOLDERID_Profile);
}
#else
if (home == nullptr)
{
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, TR_SYS_DIR_CREATE_PARENTS, 0777);
tr_sys_dir_create(session->torrent_dir, TR_SYS_DIR_CREATE_PARENTS, 0777);
}
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_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_strvDup(tr_strvPath(getHomeDir(), "Library", "Application Support", appname));
#elif defined(_WIN32)
char* appdata = win32_get_known_folder(FOLDERID_LocalAppData);
s = tr_strvDup(tr_strvPath(appdata, appname));
tr_free(appdata);
#elif defined(__HAIKU__)
char buf[PATH_MAX];
find_directory(B_USER_SETTINGS_DIRECTORY, -1, true, buf, sizeof(buf));
s = tr_strvDup(tr_strvPath(buf, appname));
#else
char* const xdg_config_home = tr_env_get_string("XDG_CONFIG_HOME", nullptr);
if (xdg_config_home != nullptr)
{
s = tr_strvDup(tr_strvPath(xdg_config_home, appname));
tr_free(xdg_config_home);
}
else
{
s = tr_strvDup(tr_strvPath(getHomeDir(), ".config", appname));
}
#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(getUserDirsFilename(), content) && std::empty(content))
{
return {};
}
// search for key="val" and extract val
auto const search = fmt::format(FMT_STRING("{:s}=\""), key);
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;
if (auto const it = std::search(std::begin(val), std::end(val), std::begin(Home), std::end(Home)); 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)
{
if (auto const xdg_user_dir = getXdgEntryFromUserDirs("XDG_DOWNLOAD_DIR"sv); !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_strvDup(tr_strvPath(getHomeDir(), "Desktop"));
#else
user_dir = tr_strvDup(tr_strvPath(getHomeDir(), "Downloads"));
#endif
}
}
return user_dir;
}
/***
****
***/
static bool isWebClientDir(std::string_view path)
{
auto const filename = tr_pathbuf{ path, '/', "index.html"sv };
bool const found = tr_sys_path_exists(filename);
tr_logAddTrace(fmt::format(FMT_STRING("Searching for web interface file '{:s}'"), filename));
return found;
}
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);
}
#ifdef BUILD_MAC_CLIENT
// look in the Application Support folder
if (s == nullptr)
{
if (auto path = tr_pathbuf{ session->config_dir, "/public_html"sv }; isWebClientDir(path))
{
s = tr_strvDup(path);
}
}
// look in the resource bundle
if (s == nullptr)
{
auto app_url = CFBundleCopyBundleURL(CFBundleGetMainBundle());
auto app_ref = CFURLCopyFileSystemPath(app_url, kCFURLPOSIXPathStyle);
auto const buflen = CFStringGetMaximumSizeOfFileSystemRepresentation(app_ref);
auto buf = std::vector<char>(buflen, '\0');
bool const success = CFStringGetFileSystemRepresentation(app_ref, std::data(buf), std::size(buf));
TR_ASSERT(success);
CFRelease(app_url);
CFRelease(app_ref);
if (auto const path = tr_pathbuf{ std::string_view{ std::data(buf) }, "/Contents/Resources/public_html"sv };
isWebClientDir(path))
{
s = tr_strvDup(path);
}
}
#elif defined(_WIN32)
if (s == nullptr)
{
/* 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]);
if (auto const path = tr_pathbuf{ std::string_view{ dir }, "/Transmission/Web"sv }; isWebClientDir(path))
{
s = tr_strvDup(path);
}
tr_free(dir);
}
}
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);
if (auto const dir = tr_sys_path_dirname(module_path); !std::empty(dir))
{
if (auto const path = tr_pathbuf{ dir, "/Web"sv }; isWebClientDir(path))
{
s = tr_strvDup(path);
}
}
tr_free(module_path);
}
#else // everyone else, follow the XDG spec
if (s == nullptr)
{
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 = fmt::format(FMT_STRING("{:s}:{:s}:/usr/local/share:/usr/share"), pkg, xdg);
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)
{
if (auto const path = tr_pathbuf{ dir, "/transmission/public_html"sv }; 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, 0, 0);
return result;
#endif
}
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