summaryrefslogtreecommitdiff
path: root/src/grp-resolve/systemd-resolved/resolved.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/grp-resolve/systemd-resolved/resolved.c')
-rw-r--r--src/grp-resolve/systemd-resolved/resolved.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/src/grp-resolve/systemd-resolved/resolved.c b/src/grp-resolve/systemd-resolved/resolved.c
new file mode 100644
index 0000000000..7fe9b7edbb
--- /dev/null
+++ b/src/grp-resolve/systemd-resolved/resolved.c
@@ -0,0 +1,121 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Tom Gundersen <teg@jklm.no>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <systemd/sd-daemon.h>
+#include <systemd/sd-event.h>
+
+#include "systemd-basic/capability-util.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/selinux-util.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/user-util.h"
+
+#include "resolved-conf.h"
+#include "resolved-manager.h"
+#include "resolved-resolv-conf.h"
+
+int main(int argc, char *argv[]) {
+ _cleanup_(manager_freep) Manager *m = NULL;
+ const char *user = "systemd-resolve";
+ uid_t uid;
+ gid_t gid;
+ int r;
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ if (argc != 1) {
+ log_error("This program takes no arguments.");
+ r = -EINVAL;
+ goto finish;
+ }
+
+ umask(0022);
+
+ r = mac_selinux_init();
+ if (r < 0) {
+ log_error_errno(r, "SELinux setup failed: %m");
+ goto finish;
+ }
+
+ r = get_user_creds(&user, &uid, &gid, NULL, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Cannot resolve user name %s: %m", user);
+ goto finish;
+ }
+
+ /* Always create the directory where resolv.conf will live */
+ r = mkdir_safe_label("/run/systemd/resolve", 0755, uid, gid);
+ if (r < 0) {
+ log_error_errno(r, "Could not create runtime directory: %m");
+ goto finish;
+ }
+
+ /* Drop privileges, but keep three caps. Note that we drop those too, later on (see below) */
+ r = drop_privileges(uid, gid,
+ (UINT64_C(1) << CAP_NET_RAW)| /* needed for SO_BINDTODEVICE */
+ (UINT64_C(1) << CAP_NET_BIND_SERVICE)| /* needed to bind on port 53 */
+ (UINT64_C(1) << CAP_SETPCAP) /* needed in order to drop the caps later */);
+ if (r < 0)
+ goto finish;
+
+ assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGUSR1, SIGUSR2, -1) >= 0);
+
+ r = manager_new(&m);
+ if (r < 0) {
+ log_error_errno(r, "Could not create manager: %m");
+ goto finish;
+ }
+
+ r = manager_start(m);
+ if (r < 0) {
+ log_error_errno(r, "Failed to start manager: %m");
+ goto finish;
+ }
+
+ /* Write finish default resolv.conf to avoid a dangling symlink */
+ (void) manager_write_resolv_conf(m);
+
+ /* Let's drop the remaining caps now */
+ r = capability_bounding_set_drop(0, true);
+ if (r < 0) {
+ log_error_errno(r, "Failed to drop remaining caps: %m");
+ goto finish;
+ }
+
+ sd_notify(false,
+ "READY=1\n"
+ "STATUS=Processing requests...");
+
+ r = sd_event_loop(m->event);
+ if (r < 0) {
+ log_error_errno(r, "Event loop failed: %m");
+ goto finish;
+ }
+
+ sd_event_get_exit_code(m->event, &r);
+
+finish:
+ sd_notify(false,
+ "STOPPING=1\n"
+ "STATUS=Shutting down...");
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}