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