return r;
}
-static char *get_dir(mode_t m, const char *env_name) {
- const char *e;
- char *d;
+static char *get_pulse_home(void) {
+ char h[PATH_MAX];
+ struct stat st;
- if ((e = getenv(env_name)))
- d = pa_xstrdup(e);
- else {
- char h[PATH_MAX];
- struct stat st;
+ if (!pa_get_home_dir(h, sizeof(h))) {
+ pa_log_error("Failed to get home directory.");
+ return NULL;
+ }
- if (!pa_get_home_dir(h, sizeof(h))) {
- pa_log_error("Failed to get home directory.");
- return NULL;
- }
+ if (stat(h, &st) < 0) {
+ pa_log_error("Failed to stat home directory %s: %s", h, pa_cstrerror(errno));
+ return NULL;
+ }
- if (stat(h, &st) < 0) {
- pa_log_error("Failed to stat home directory %s: %s", h, pa_cstrerror(errno));
- return NULL;
- }
+ if (st.st_uid != getuid()) {
+ pa_log_error("Home directory %s not ours.", h);
+ return NULL;
+ }
- if (st.st_uid != getuid()) {
- pa_log_error("Home directory %s not ours.", h);
+ return pa_sprintf_malloc("%s" PA_PATH_SEP ".pulse", h);
+}
+
+char *pa_get_state_dir(void) {
+ char *d;
+
+ /* The state directory shall contain dynamic data that should be
+ * kept across reboots, and is private to this user */
+
+ if (!(d = pa_xstrdup(getenv("PULSE_STATE_PATH"))))
+ if (!(d = get_pulse_home()))
return NULL;
- }
- d = pa_sprintf_malloc("%s" PA_PATH_SEP ".pulse", h);
- }
+ /* If PULSE_STATE_PATH and PULSE_RUNTIME_PATH point to the same
+ * dir then this will break. */
- if (pa_make_secure_dir(d, m, (pid_t) -1, (pid_t) -1) < 0) {
+ if (pa_make_secure_dir(d, 0700, (pid_t) -1, (pid_t) -1) < 0) {
pa_log_error("Failed to create secure directory: %s", pa_cstrerror(errno));
+ pa_xfree(d);
return NULL;
}
return d;
}
-char *pa_get_runtime_dir(void) {
- return get_dir(pa_in_system_mode() ? 0755 : 0700, "PULSE_RUNTIME_PATH");
+static char* make_random_dir(mode_t m) {
+ static const char table[] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "0123456789";
+
+ char fn[24] = "/tmp/pulse-";
+
+ fn[sizeof(fn)-1] = 0;
+
+ for (;;) {
+ unsigned i;
+ int r;
+ mode_t u;
+ int saved_errno;
+
+ for (i = 11; i < sizeof(fn)-1; i++)
+ fn[i] = table[rand() % (sizeof(table)-1)];
+
+ u = umask((~m) & 0777);
+ r = mkdir(fn, m);
+ saved_errno = errno;
+ umask(u);
+
+ if (r >= 0)
+ return pa_xstrdup(fn);
+
+ errno = saved_errno;
+
+ if (errno != EEXIST) {
+ pa_log_error("Failed to create random directory %s: %s", fn, pa_cstrerror(errno));
+ return NULL;
+ }
+ }
}
-char *pa_get_state_dir(void) {
- return get_dir(0700, "PULSE_STATE_PATH");
+static int make_random_dir_and_link(mode_t m, const char *k) {
+ char *p;
+
+ if (!(p = make_random_dir(m)))
+ return -1;
+
+ if (symlink(p, k) < 0) {
+ int saved_errno = errno;
+
+ if (errno != EEXIST)
+ pa_log_error("Failed to symlink %s to %s: %s", k, p, pa_cstrerror(errno));
+
+ rmdir(p);
+ pa_xfree(p);
+
+ errno = saved_errno;
+ return -1;
+ }
+
+ return 0;
+}
+
+char *pa_get_runtime_dir(void) {
+ char *d, *k = NULL, *p = NULL, *t = NULL, *mid;
+ struct stat st;
+
+ /* The runtime directory shall contain dynamic data that needs NOT
+ * to be kept accross reboots and is usuallly private to the user,
+ * except in system mode, where it might be accessible by other
+ * users, too. Since we need POSIX locking and UNIX sockets in
+ * this directory, we link it to a random subdir in /tmp, if it
+ * was not explicitly configured. */
+
+ if ((d = getenv("PULSE_RUNTIME_PATH"))) {
+ mode_t m;
+
+ m = pa_in_system_mode() ? 0755 : 0700;
+
+ if (pa_make_secure_dir(d, m, (pid_t) -1, (pid_t) -1) < 0) {
+ pa_log_error("Failed to create secure directory: %s", pa_cstrerror(errno));
+ goto fail;
+ }
+
+ return pa_xstrdup(d);
+ }
+
+ if (!(d = get_pulse_home()))
+ goto fail;
+
+ if (!(mid = pa_machine_id())) {
+ pa_xfree(d);
+ goto fail;
+ }
+
+ k = pa_sprintf_malloc("%s" PA_PATH_SEP "%s:runtime", d, mid);
+ pa_xfree(d);
+ pa_xfree(mid);
+
+ for (;;) {
+ /* OK, first let's check if the "runtime" symlink is already
+ * existant */
+
+ if (!(p = pa_readlink(k))) {
+
+ if (errno != ENOENT) {
+ pa_log_error("Failed to stat runtime directory %s: %s", k, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ /* Hmm, so the runtime directory didn't exist yet, so let's
+ * create one in /tmp and symlink that to it */
+
+ if (make_random_dir_and_link(0700, k) < 0) {
+
+ /* Mhmm, maybe another process was quicker than us,
+ * let's check if that was valid */
+ if (errno == EEXIST)
+ continue;
+
+ goto fail;
+ }
+
+ return k;
+ }
+
+ /* Make sure that this actually makes sense */
+ if (!pa_is_path_absolute(p)) {
+ pa_log_error("Path %s in link %s is not absolute.", p, k);
+ goto fail;
+ }
+
+ /* Hmm, so this symlink is still around, make sure nobody fools
+ * us */
+
+ if (lstat(p, &st) < 0) {
+
+ if (errno != ENOENT) {
+ pa_log_error("Failed to stat runtime directory %s: %s", p, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ } else {
+
+ if (S_ISDIR(st.st_mode) &&
+ (st.st_uid == getuid()) &&
+ ((st.st_mode & 0777) == 0700)) {
+
+ pa_xfree(p);
+ return k;
+ }
+
+ pa_log_info("Hmm, runtime path exists, but points to an invalid directory. Changing runtime directory.");
+ }
+
+ pa_xfree(p);
+ p = NULL;
+
+ /* Hmm, so the link points to some nonexisting or invalid
+ * dir. Let's replace it by a new link. We first create a
+ * temporary link and then rename that to allow concurrent
+ * execution of this function. */
+
+ t = pa_sprintf_malloc("%s.tmp", k);
+
+ if (make_random_dir_and_link(0700, t) < 0) {
+
+ if (errno != EEXIST) {
+ pa_log_error("Failed to symlink %s: %s", t, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ pa_xfree(t);
+ t = NULL;
+
+ /* Hmm, someone lese was quicker then us. Let's give
+ * him some time to finish, and retry. */
+ pa_msleep(10);
+ continue;
+ }
+
+ /* OK, we succeeded in creating the temporary symlink, so
+ * let's rename it */
+ if (rename(t, k) < 0) {
+ pa_log_error("Failed to rename %s to %s: %s", t, k, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ pa_xfree(t);
+ return k;
+ }
+
+fail:
+ pa_xfree(p);
+ pa_xfree(k);
+ pa_xfree(t);
+
+ return NULL;
}
/* Try to open a configuration file. If "env" is specified, open the