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;
+}