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refactor: Break wine API functions out of the main daemon source

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Signed-off-by: Kai Krakow <kai@kaishome.de>
This commit is contained in:
Kai Krakow 2018-10-08 22:40:35 +02:00
parent 403ce122f6
commit f4cd01f989
4 changed files with 175 additions and 111 deletions
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164
daemon/gamemode-wine.c Normal file
View File

@ -0,0 +1,164 @@
/*
Copyright (c) 2017-2018, Feral Interactive
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Feral Interactive nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#define _GNU_SOURCE
#include "gamemode.h"
#include "helpers.h"
#include "logging.h"
#include <ctype.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
/**
* Detect if the process is a wine preloader process
*/
bool game_mode_detect_wine_preloader(const char *exe)
{
return (strtail(exe, "/wine-preloader") || strtail(exe, "/wine64-preloader"));
}
/**
* Detect if the process is a wine loader process
*/
bool game_mode_detect_wine_loader(const char *exe)
{
return (strtail(exe, "/wine") || strtail(exe, "/wine64"));
}
/**
* Attempt to resolve the exe for wine-preloader.
* This function is used if game_mode_context_find_exe() identified the
* process as wine-preloader. Returns NULL when resolve fails.
*/
char *game_mode_resolve_wine_preloader(const pid_t pid)
{
char buffer[PATH_MAX];
char *proc_path = NULL, *wine_exe = NULL, *wineprefix = NULL;
/* Open the directory, we are potentially reading multiple files from it */
procfd_t proc_fd = game_mode_open_proc(pid);
if (proc_fd == INVALID_PROCFD)
goto fail_proc;
/* Open the command line */
int fd = openat(proc_fd, "cmdline", O_RDONLY | O_CLOEXEC);
if (fd != -1) {
FILE *stream = fdopen(fd, "r");
if (stream) {
char *argv = NULL;
size_t args = 0;
int argc = 0;
while (!wine_exe && (argc++ < 2) && (getdelim(&argv, &args, 0, stream) != -1)) {
/* If we see the wine loader here, we have to use the next argument */
if (strtail(argv, "/wine") || strtail(argv, "/wine64"))
continue;
free(wine_exe); // just in case
/* Check presence of the drive letter, we assume that below */
wine_exe = args > 2 && argv[1] == ':' ? strndup(argv, args) : NULL;
}
free(argv);
fclose(stream);
} else
close(fd);
}
/* Did we get wine exe from cmdline? */
if (wine_exe)
LOG_MSG("Detected wine exe for client %d [%s].\n", pid, wine_exe);
else
goto fail_cmdline;
/* Open the process environment and find the WINEPREFIX */
errno = 0;
if (!(wineprefix = game_mode_lookup_proc_env(proc_fd, "WINEPREFIX"))) {
/* Lookup user home instead only if there was no error */
char *home = NULL;
if (errno == 0)
home = game_mode_lookup_user_home();
/* Append "/.wine" if we found the user home */
if (home)
wineprefix = safe_snprintf(buffer, "%s/.wine", home);
/* Cleanup and check result */
free(home);
if (!wineprefix)
goto fail_env;
}
/* Wine prefix was detected, log this for diagnostics */
LOG_MSG("Detected wine prefix for client %d: '%s'\n", pid, wineprefix);
/* Convert Windows to Unix path separators */
char *ix = wine_exe;
while (ix != NULL)
(ix = strchr(ix, '\\')) && (*ix++ = '/');
/* Convert the drive letter to lcase because wine handles it this way in the prefix */
wine_exe[0] = (char)tolower(wine_exe[0]);
/* Convert relative wine exe path to full unix path */
char *wine_path = buffered_snprintf(buffer, "%s/dosdevices/%s", wineprefix, wine_exe);
free(wine_exe);
wine_exe = wine_path ? realpath(wine_path, NULL) : NULL;
/* Fine? Successo? Fortuna! */
if (wine_exe)
LOG_MSG("Successfully mapped wine client %d [%s].\n", pid, wine_exe);
else
goto fail;
error_cleanup:
game_mode_close_proc(proc_fd);
free(wineprefix);
free(proc_path);
return wine_exe;
fail:
LOG_ERROR("Unable to find wine executable for client %d: %s\n", pid, strerror(errno));
goto error_cleanup;
fail_cmdline:
LOG_ERROR("Wine loader has no accepted cmdline for client %d yet, deferring.\n", pid);
goto error_cleanup;
fail_env:
LOG_ERROR("Failed to access process environment in '%s': %s\n", proc_path, strerror(errno));
goto error_cleanup;
fail_proc:
LOG_ERROR("Failed to access process data in '%s': %s\n", proc_path, strerror(errno));
goto error_cleanup;
}

113
daemon/gamemode.c
View File

@ -38,8 +38,6 @@ POSSIBILITY OF SUCH DAMAGE.
#include "helpers.h"
#include "logging.h"
#include <ctype.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdatomic.h>
@ -562,113 +560,6 @@ GameModeConfig *game_mode_config_from_context(const GameModeContext *context)
return context ? context->config : NULL;
}
/**
* Attempt to resolve the exe for wine-preloader.
* This function is used if game_mode_context_find_exe() identified the
* process as wine-preloader. Returns NULL when resolve fails.
*/
static char *game_mode_resolve_wine_preloader(pid_t pid)
{
char buffer[PATH_MAX];
char *proc_path = NULL, *wine_exe = NULL, *wineprefix = NULL;
/* Open the directory, we are potentially reading multiple files from it */
procfd_t proc_fd = game_mode_open_proc(pid);
if (proc_fd == INVALID_PROCFD)
goto fail_proc;
/* Open the command line */
int fd = openat(proc_fd, "cmdline", O_RDONLY | O_CLOEXEC);
if (fd != -1) {
FILE *stream = fdopen(fd, "r");
if (stream) {
char *argv = NULL;
size_t args = 0;
int argc = 0;
while (!wine_exe && (argc++ < 2) && (getdelim(&argv, &args, 0, stream) != -1)) {
/* If we see the wine loader here, we have to use the next argument */
if (strtail(argv, "/wine") || strtail(argv, "/wine64"))
continue;
free(wine_exe); // just in case
/* Check presence of the drive letter, we assume that below */
wine_exe = args > 2 && argv[1] == ':' ? strndup(argv, args) : NULL;
}
free(argv);
fclose(stream);
} else
close(fd);
}
/* Did we get wine exe from cmdline? */
if (wine_exe)
LOG_MSG("Detected wine exe for client %d [%s].\n", pid, wine_exe);
else
goto fail_cmdline;
/* Open the process environment and find the WINEPREFIX */
errno = 0;
if (!(wineprefix = game_mode_lookup_proc_env(proc_fd, "WINEPREFIX"))) {
/* Lookup user home instead only if there was no error */
char *home = NULL;
if (errno == 0)
home = game_mode_lookup_user_home();
/* Append "/.wine" if we found the user home */
if (home)
wineprefix = safe_snprintf(buffer, "%s/.wine", home);
/* Cleanup and check result */
free(home);
if (!wineprefix)
goto fail_env;
}
/* Wine prefix was detected, log this for diagnostics */
LOG_MSG("Detected wine prefix for client %d: '%s'\n", pid, wineprefix);
/* Convert Windows to Unix path separators */
char *ix = wine_exe;
while (ix != NULL)
(ix = strchr(ix, '\\')) && (*ix++ = '/');
/* Convert the drive letter to lcase because wine handles it this way in the prefix */
wine_exe[0] = (char)tolower(wine_exe[0]);
/* Convert relative wine exe path to full unix path */
char *wine_path = buffered_snprintf(buffer, "%s/dosdevices/%s", wineprefix, wine_exe);
free(wine_exe);
wine_exe = wine_path ? realpath(wine_path, NULL) : NULL;
/* Fine? Successo? Fortuna! */
if (wine_exe)
LOG_MSG("Successfully mapped wine client %d [%s].\n", pid, wine_exe);
else
goto fail;
error_cleanup:
game_mode_close_proc(proc_fd);
free(wineprefix);
free(proc_path);
return wine_exe;
fail:
LOG_ERROR("Unable to find wine executable for client %d: %s\n", pid, strerror(errno));
goto error_cleanup;
fail_cmdline:
LOG_ERROR("Wine loader has no accepted cmdline for client %d yet, deferring.\n", pid);
goto error_cleanup;
fail_env:
LOG_ERROR("Failed to access process environment in '%s': %s\n", proc_path, strerror(errno));
goto error_cleanup;
fail_proc:
LOG_ERROR("Failed to access process data in '%s': %s\n", proc_path, strerror(errno));
goto error_cleanup;
}
/**
* Attempt to locate the exe for the process.
* We might run into issues if the process is running under an odd umask.
@ -687,11 +578,11 @@ static char *game_mode_context_find_exe(pid_t pid)
goto fail;
/* Detect if the process is a wine loader process */
if (strtail(exe, "/wine-preloader") || strtail(exe, "/wine64-preloader")) {
if (game_mode_detect_wine_preloader(exe)) {
LOG_MSG("Detected wine preloader for client %d [%s].\n", pid, exe);
goto wine_preloader;
}
if (strtail(exe, "/wine") || strtail(exe, "/wine64")) {
if (game_mode_detect_wine_loader(exe)) {
LOG_MSG("Detected wine loader for client %d [%s].\n", pid, exe);
goto wine_preloader;
}

8
daemon/gamemode.h
View File

@ -123,3 +123,11 @@ int game_mode_close_proc(const procfd_t procfd);
*/
void game_mode_apply_renice(const GameModeContext *self, const pid_t client);
void game_mode_apply_scheduling(const GameModeContext *self, const pid_t client);
/** gamemode-wine.c
* Provides internal API functions specific to handling wine
* prefixes.
*/
bool game_mode_detect_wine_loader(const char *exe);
bool game_mode_detect_wine_preloader(const char *exe);
char *game_mode_resolve_wine_preloader(const pid_t pid);

1
daemon/meson.build
View File

@ -22,6 +22,7 @@ daemon_sources = [
'gamemode-ioprio.c',
'gamemode-proc.c',
'gamemode-sched.c',
'gamemode-wine.c',
'daemonize.c',
'dbus_messaging.c',
'governors.c',