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/* PipeWire
*
* Copyright © 2020 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef HAVE_SYS_VFS_H
#include <sys/vfs.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <spa/utils/result.h>
#include <pipewire/context.h>
#include <pipewire/log.h>
#include <pipewire/keys.h>
#include "log.h"
#include "utils.h"
int get_runtime_dir(char *buf, size_t buflen)
{
const char *runtime_dir, *dir = NULL;
struct stat stat_buf;
int res, size;
runtime_dir = getenv("PULSE_RUNTIME_PATH");
if (runtime_dir == NULL) {
runtime_dir = getenv("XDG_RUNTIME_DIR");
dir = "pulse";
}
if (runtime_dir == NULL) {
pw_log_error("could not find a suitable runtime directory in"
"$PULSE_RUNTIME_PATH and $XDG_RUNTIME_DIR");
return -ENOENT;
}
size = snprintf(buf, buflen, "%s%s%s", runtime_dir,
dir ? "/" : "", dir ? dir : "");
if (size < 0)
return -errno;
if ((size_t) size >= buflen) {
pw_log_error("path %s%s%s too long", runtime_dir,
dir ? "/" : "", dir ? dir : "");
return -ENAMETOOLONG;
}
if (stat(buf, &stat_buf) < 0) {
res = -errno;
if (res != -ENOENT) {
pw_log_error("stat() %s failed: %m", buf);
return res;
}
if (mkdir(buf, 0700) < 0) {
res = -errno;
pw_log_error("mkdir() %s failed: %m", buf);
return res;
}
pw_log_info("created %s", buf);
} else if (!S_ISDIR(stat_buf.st_mode)) {
pw_log_error("%s is not a directory", buf);
return -ENOTDIR;
}
return 0;
}
int check_flatpak(struct client *client, pid_t pid)
{
char root_path[2048];
int root_fd, info_fd, res;
struct stat stat_buf;
sprintf(root_path, "/proc/%ld/root", (long) pid);
root_fd = openat(AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
if (root_fd == -1) {
res = -errno;
if (res == -EACCES) {
struct statfs buf;
/* Access to the root dir isn't allowed. This can happen if the root is on a fuse
* filesystem, such as in a toolbox container. We will never have a fuse rootfs
* in the flatpak case, so in that case its safe to ignore this and
* continue to detect other types of apps. */
if (statfs(root_path, &buf) == 0 &&
buf.f_type == 0x65735546) /* FUSE_SUPER_MAGIC */
return 0;
}
/* Not able to open the root dir shouldn't happen. Probably the app died and
* we're failing due to /proc/$pid not existing. In that case fail instead
* of treating this as privileged. */
pw_log_info("failed to open \"%s\"%s", root_path, spa_strerror(res));
return res;
}
info_fd = openat(root_fd, ".flatpak-info", O_RDONLY | O_CLOEXEC | O_NOCTTY);
close(root_fd);
if (info_fd == -1) {
if (errno == ENOENT) {
pw_log_debug("no .flatpak-info, client on the host");
/* No file => on the host */
return 0;
}
res = -errno;
pw_log_error("error opening .flatpak-info: %m");
return res;
}
if (fstat(info_fd, &stat_buf) != 0 || !S_ISREG(stat_buf.st_mode)) {
/* Some weird fd => failure, assume sandboxed */
pw_log_error("error fstat .flatpak-info: %m");
}
close(info_fd);
return 1;
}
pid_t get_client_pid(struct client *client, int client_fd)
{
socklen_t len;
#if defined(__linux__)
struct ucred ucred;
len = sizeof(ucred);
if (getsockopt(client_fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len) < 0) {
pw_log_warn("client %p: no peercred: %m", client);
} else
return ucred.pid;
#elif defined(__FreeBSD__) || defined(__MidnightBSD__)
struct xucred xucred;
len = sizeof(xucred);
if (getsockopt(client_fd, 0, LOCAL_PEERCRED, &xucred, &len) < 0) {
pw_log_warn("client %p: no peercred: %m", client);
} else {
#if __FreeBSD__ >= 13
return xucred.cr_pid;
#endif
}
#endif
return 0;
}
const char *get_server_name(struct pw_context *context)
{
const char *name = NULL;
const struct pw_properties *props = pw_context_get_properties(context);
name = getenv("PIPEWIRE_REMOTE");
if ((name == NULL || name[0] == '\0') && props != NULL)
name = pw_properties_get(props, PW_KEY_REMOTE_NAME);
if (name == NULL || name[0] == '\0')
name = PW_DEFAULT_REMOTE;
return name;
}
int create_pid_file(void) {
char pid_file[PATH_MAX];
FILE *f;
int res;
if ((res = get_runtime_dir(pid_file, sizeof(pid_file))) < 0)
return res;
if (strlen(pid_file) > PATH_MAX - sizeof("/pid")) {
pw_log_error("path too long: %s/pid", pid_file);
return -ENAMETOOLONG;
}
strcat(pid_file, "/pid");
if ((f = fopen(pid_file, "we")) == NULL) {
res = -errno;
pw_log_error("failed to open pid file: %m");
return res;
}
fprintf(f, "%lu\n", (unsigned long) getpid());
fclose(f);
return 0;
}
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