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-rw-r--r--src/tempfiles.c307
1 files changed, 307 insertions, 0 deletions
diff --git a/src/tempfiles.c b/src/tempfiles.c
new file mode 100644
index 0000000000..80e424f7b6
--- /dev/null
+++ b/src/tempfiles.c
@@ -0,0 +1,307 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <limits.h>
+#include <dirent.h>
+#include <grp.h>
+#include <pwd.h>
+
+#include "log.h"
+#include "util.h"
+#include "strv.h"
+#include "label.h"
+
+/* This reads all files listed in /etc/tempfiles.d/?*.conf and creates
+ * them in the file system. This is intended to be used to create
+ * properly owned directories beneath /tmp, /var/tmp, /var/run and
+ * /var/lock which are volatile and hence need to be recreated on
+ * bootup. */
+
+static void process_line(const char *fname, unsigned line, const char *buffer, const char *prefix) {
+ char type;
+ char *path = NULL;
+ unsigned mode;
+ char *user = NULL, *group = NULL;
+ uid_t uid;
+ gid_t gid;
+ bool uid_set = false, gid_set = false;
+ int n, fd = -1;
+
+ assert(fname);
+ assert(line >= 1);
+ assert(buffer);
+
+ if ((n = sscanf(buffer,
+ "%c "
+ "%ms "
+ "%o "
+ "%ms "
+ "%ms ",
+ &type,
+ &path,
+ &mode,
+ &user,
+ &group)) < 2) {
+ log_error("[%s:%u] Syntax error.", fname, line);
+ goto finish;
+ }
+
+ if (type != 'f' && type != 'd') {
+ log_error("[%s:%u] Unknown file type '%c'.", fname, line, type);
+ goto finish;
+ }
+
+ if (prefix && !path_startswith(path, prefix))
+ goto finish;
+
+ if (user && !streq(user, "-")) {
+ unsigned long lu;
+ struct passwd *p;
+
+ if (streq(user, "root") || streq(user, "0"))
+ uid = 0;
+ else if (safe_atolu(user, &lu) >= 0)
+ uid = (uid_t) lu;
+ else if ((p = getpwnam(user)))
+ uid = p->pw_uid;
+ else {
+ log_error("[%s:%u] Unknown user '%s'.", fname, line, user);
+ goto finish;
+ }
+
+ uid_set = true;
+ }
+
+ if (group && !streq(group, "-")) {
+ unsigned long lu;
+ struct group *g;
+
+ if (streq(group, "root") || streq(group, "0"))
+ gid = 0;
+ else if (safe_atolu(group, &lu) >= 0)
+ gid = (gid_t) lu;
+ else if ((g = getgrnam(group)))
+ gid = g->gr_gid;
+ else {
+ log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
+ goto finish;
+ }
+
+ gid_set = true;
+ }
+
+ if (n < 3)
+ mode = type == 'f' ? 0644 : 0755;
+
+ if (type == 'f') {
+ mode_t u;
+ struct stat st;
+
+ u = umask(0);
+ fd = open(path, O_CREAT|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, mode);
+ umask(u);
+
+ if (fd < 0) {
+ log_error("Failed to create file %s: %m", path);
+ goto finish;
+ }
+
+ if (fstat(fd, &st) < 0) {
+ log_error("stat(%s) failed: %m", path);
+ goto finish;
+ }
+
+ if (!S_ISREG(st.st_mode)) {
+ log_error("%s is not a file.", path);
+ goto finish;
+ }
+
+ if (fchmod(fd, mode) < 0) {
+ log_error("chmod(%s) failed: %m", path);
+ goto finish;
+ }
+
+ if (uid_set || gid_set) {
+
+ if (fchown(fd,
+ uid_set ? uid : (uid_t) -1,
+ gid_set ? gid : (gid_t) -1) < 0) {
+ log_error("chown(%s) failed: %m", path);
+ goto finish;
+ }
+ }
+
+ } else if (type == 'd') {
+ mode_t u;
+ int r;
+ struct stat st;
+
+ u = umask(0);
+ r = mkdir(path, mode);
+ umask(u);
+
+ if (r < 0 && errno != EEXIST) {
+ log_error("Failed to create directory %s: %m", path);
+ goto finish;
+ }
+
+ if (stat(path, &st) < 0) {
+ log_error("stat(%s) failed: %m", path);
+ goto finish;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ log_error("%s is not a directory.", path);
+ goto finish;
+ }
+
+ if (chmod(path, mode) < 0) {
+ log_error("chmod(%s) failed: %m", path);
+ goto finish;
+ }
+
+ if (uid_set || gid_set) {
+
+ if (chown(path,
+ uid_set ? uid : (uid_t) -1,
+ gid_set ? gid : (gid_t) -1) < 0) {
+ log_error("chown(%s) failed: %m", path);
+ goto finish;
+ }
+ }
+ }
+
+ label_fix(path);
+
+ log_debug("%s created successfully.", path);
+
+finish:
+ free(path);
+ free(user);
+ free(group);
+
+ if (fd >= 0)
+ close_nointr_nofail(fd);
+}
+
+static int scandir_filter(const struct dirent *d) {
+ assert(d);
+
+ if (ignore_file(d->d_name))
+ return 0;
+
+ if (d->d_type != DT_REG &&
+ d->d_type != DT_LNK)
+ return 0;
+
+ return endswith(d->d_name, ".conf");
+}
+
+int main(int argc, char *argv[]) {
+ struct dirent **de = NULL;
+ int r = EXIT_FAILURE, n, i;
+ const char *prefix = NULL;
+
+ if (argc > 2) {
+ log_error("This program takes no more than one argument.");
+ return EXIT_FAILURE;
+ } else if (argc > 1)
+ prefix = argv[1];
+ else
+ prefix = "/";
+
+ log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+ log_parse_environment();
+ log_open();
+
+ label_init();
+
+ if ((n = scandir("/etc/tempfiles.d/", &de, scandir_filter, alphasort)) < 0) {
+
+ if (errno == ENOENT)
+ r = EXIT_SUCCESS;
+ else
+ log_error("Failed to enumerate /etc/tempfiles.d/ files: %m");
+
+ goto finish;
+ }
+
+ r = EXIT_SUCCESS;
+
+ for (i = 0; i < n; i++) {
+ int k;
+ char *fn;
+ FILE *f;
+ unsigned j;
+
+ k = asprintf(&fn, "/etc/tempfiles.d/%s", de[i]->d_name);
+ free(de[i]);
+
+ if (k < 0) {
+ log_error("Failed to allocate file name.");
+ r = EXIT_FAILURE;
+ continue;
+ }
+
+ f = fopen(fn, "re");
+ free(fn);
+
+ if (!f) {
+ log_error("Failed to open %s: %m", fn);
+ r = EXIT_FAILURE;
+ continue;
+ }
+
+ j = 0;
+ for (;;) {
+ char line[LINE_MAX], *l;
+
+ if (!(fgets(line, sizeof(line), f)))
+ break;
+
+ j++;
+
+ l = strstrip(line);
+ if (*l == '#' || *l == 0)
+ continue;
+
+ process_line(de[i]->d_name, j, l, prefix);
+ }
+
+ if (ferror(f)) {
+ r = EXIT_FAILURE;
+ log_error("Failed to read from file: %m");
+ }
+
+ fclose(f);
+ }
+
+ free(de);
+
+finish:
+
+ return r;
+}
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