/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 "sd-daemon.h" #include "sd-event.h" #include "capability-util.h" #include "mkdir.h" #include "resolved-conf.h" #include "resolved-manager.h" #include "resolved-resolv-conf.h" #include "selinux-util.h" #include "signal-util.h" #include "user-util.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(NULL); 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; } r = drop_privileges(uid, gid, 0); if (r < 0) goto finish; assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGUSR1, -1) >= 0); r = manager_new(&m); if (r < 0) { log_error_errno(r, "Could not create manager: %m"); goto finish; } r = manager_parse_config_file(m); if (r < 0) log_warning_errno(r, "Failed to parse configuration file: %m"); 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 */ r = manager_write_resolv_conf(m); if (r < 0) log_warning_errno(r, "Could not create resolv.conf: %m"); 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; }