X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-daemon%2Fmain.c;h=f64524a730e85bcaf1c4289135197b52cd5f2033;hb=f17d2832301b0f2fcd50fdcc6fec77666178158f;hp=4a8d44dd1d1cdd11f0c2b641a57596fd555e3eea;hpb=514a726560b8e8582abff7ccbc6e69ade5cdb04a;p=catta diff --git a/avahi-daemon/main.c b/avahi-daemon/main.c index 4a8d44d..f64524a 100644 --- a/avahi-daemon/main.c +++ b/avahi-daemon/main.c @@ -23,76 +23,1022 @@ #include #endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include +#include + #include +#include +#include +#include #include "main.h" #include "simple-protocol.h" #include "static-services.h" +#include "ini-file-parser.h" + +#ifdef HAVE_DBUS +#include "dbus-protocol.h" +#endif AvahiServer *avahi_server = NULL; +AvahiSimplePoll *simple_poll_api = NULL; + +typedef enum { + DAEMON_RUN, + DAEMON_KILL, + DAEMON_VERSION, + DAEMON_HELP, + DAEMON_RELOAD, + DAEMON_CHECK +} DaemonCommand; + +typedef struct { + AvahiServerConfig server_config; + DaemonCommand command; + int daemonize; + int use_syslog; + char *config_file; + int enable_dbus; + int fail_on_missing_dbus; + int drop_root; + int publish_resolv_conf; + char ** publish_dns_servers; + int no_rlimits; + int debug; + + int rlimit_as_set, rlimit_core_set, rlimit_data_set, rlimit_fsize_set, rlimit_nofile_set, rlimit_stack_set; + rlim_t rlimit_as, rlimit_core, rlimit_data, rlimit_fsize, rlimit_nofile, rlimit_stack; + +#ifdef RLIMIT_NPROC + int rlimit_nproc_set; + rlim_t rlimit_nproc; +#endif +} DaemonConfig; + +#define RESOLV_CONF "/etc/resolv.conf" + +static AvahiSEntryGroup *dns_servers_entry_group = NULL; +static AvahiSEntryGroup *resolv_conf_entry_group = NULL; + +static char **resolv_conf = NULL; + +static DaemonConfig config; + +static int has_prefix(const char *s, const char *prefix) { + size_t l; + + l = strlen(prefix); + + return strlen(s) >= l && strncmp(s, prefix, l) == 0; +} + +static int load_resolv_conf(const DaemonConfig *c) { + int ret = -1; + FILE *f; + int i = 0; + + avahi_strfreev(resolv_conf); + resolv_conf = NULL; + + if (!(f = fopen(RESOLV_CONF, "r"))) { + avahi_log_warn("Failed to open "RESOLV_CONF"."); + goto finish; + } + + resolv_conf = avahi_new0(char*, AVAHI_MAX_WIDE_AREA_SERVERS+1); -static void server_callback(AvahiServer *s, AvahiServerState state, gpointer userdata) { - g_assert(s); + while (!feof(f) && i < AVAHI_MAX_WIDE_AREA_SERVERS) { + char ln[128]; + char *p; - if (state == AVAHI_SERVER_RUNNING) { - g_message("Server startup complete. Host name is <%s>", avahi_server_get_host_name_fqdn(s)); - static_service_add_to_server(); - } else if (state == AVAHI_SERVER_COLLISION) { - gchar *n; + if (!(fgets(ln, sizeof(ln), f))) + break; - static_service_remove_from_server(); + ln[strcspn(ln, "\r\n#")] = 0; + p = ln + strspn(ln, "\t "); + + if (has_prefix(p, "nameserver")) { + p += 10; + p += strspn(p, "\t "); + p[strcspn(p, "\t ")] = 0; + resolv_conf[i++] = avahi_strdup(p); + } + } + + ret = 0; + +finish: + + if (ret != 0) { + avahi_strfreev(resolv_conf); + resolv_conf = NULL; + } - n = avahi_alternative_host_name(avahi_server_get_host_name(s)); - g_message("Host name conflict, retrying with <%s>", n); - avahi_server_set_host_name(s, n); - g_free(n); + if (f) + fclose(f); + + return ret; +} + +static AvahiSEntryGroup* add_dns_servers(AvahiServer *s, AvahiSEntryGroup* g, char **l) { + char **p; + + assert(s); + assert(l); + + if (!g) + g = avahi_s_entry_group_new(s, NULL, NULL); + + assert(avahi_s_entry_group_is_empty(g)); + + for (p = l; *p; p++) { + AvahiAddress a; + + if (!avahi_address_parse(*p, AVAHI_PROTO_UNSPEC, &a)) + avahi_log_warn("Failed to parse address '%s', ignoring.", *p); + else + if (avahi_server_add_dns_server_address(s, g, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, NULL, AVAHI_DNS_SERVER_RESOLVE, &a, 53) < 0) { + avahi_s_entry_group_free(g); + avahi_log_error("Failed to add DNS server address: %s", avahi_strerror(avahi_server_errno(s))); + return NULL; + } } + + avahi_s_entry_group_commit(g); + + return g; } -int main(int argc, char *argv[]) { - GMainLoop *loop = NULL; - gint r = 255; - AvahiServerConfig config; +static void remove_dns_server_entry_groups(void) { - avahi_server_config_init(&config); + if (resolv_conf_entry_group) + avahi_s_entry_group_reset(resolv_conf_entry_group); + + if (dns_servers_entry_group) + avahi_s_entry_group_reset(dns_servers_entry_group); +} - loop = g_main_loop_new(NULL, FALSE); +static void update_wide_area_servers(void) { + AvahiAddress a[AVAHI_MAX_WIDE_AREA_SERVERS]; + unsigned n = 0; + char **p; - if (simple_protocol_setup(NULL) < 0) - goto finish; + for (p = resolv_conf; *p && n < AVAHI_MAX_WIDE_AREA_SERVERS; p++) { + if (!avahi_address_parse(*p, AVAHI_PROTO_UNSPEC, &a[n])) + avahi_log_warn("Failed to parse address '%s', ignoring.", *p); + else + n++; + } -#ifdef ENABLE_DBUS - if (dbus_protocol_setup (loop) < 0) + avahi_server_set_wide_area_servers(avahi_server, a, n); +} + +static void server_callback(AvahiServer *s, AvahiServerState state, void *userdata) { + DaemonConfig *c = userdata; + + assert(s); + assert(c); + + /* This function is possibly called before the global variable + * avahi_server has been set, therefore we do it explicitly */ + + avahi_server = s; + +#ifdef HAVE_DBUS + if (c->enable_dbus) + dbus_protocol_server_state_changed(state); +#endif + + switch (state) { + case AVAHI_SERVER_RUNNING: + avahi_log_info("Server startup complete. Host name is %s. Local service cookie is %u.", avahi_server_get_host_name_fqdn(s), avahi_server_get_local_service_cookie(s)); + static_service_add_to_server(); + + remove_dns_server_entry_groups(); + + if (c->publish_resolv_conf && resolv_conf && resolv_conf[0]) + resolv_conf_entry_group = add_dns_servers(s, resolv_conf_entry_group, resolv_conf); + + if (c->publish_dns_servers && c->publish_dns_servers[0]) + dns_servers_entry_group = add_dns_servers(s, dns_servers_entry_group, c->publish_dns_servers); + + simple_protocol_restart_queries(); + break; + + case AVAHI_SERVER_COLLISION: { + char *n; + + static_service_remove_from_server(); + + remove_dns_server_entry_groups(); + + n = avahi_alternative_host_name(avahi_server_get_host_name(s)); + avahi_log_warn("Host name conflict, retrying with <%s>", n); + avahi_server_set_host_name(s, n); + avahi_free(n); + break; + } + + case AVAHI_SERVER_FAILURE: + + avahi_log_error("Server error: %s", avahi_strerror(avahi_server_errno(s))); + avahi_simple_poll_quit(simple_poll_api); + break; + + case AVAHI_SERVER_REGISTERING: + case AVAHI_SERVER_INVALID: + break; + + } +} + +static void help(FILE *f, const char *argv0) { + fprintf(f, + "%s [options]\n" + " -h --help Show this help\n" + " -D --daemonize Daemonize after startup (implies -s)\n" + " -s --syslog Write log messages to syslog(3) instead of STDERR\n" + " -k --kill Kill a running daemon\n" + " -r --reload Request a running daemon to reload static services\n" + " -c --check Return 0 if a daemon is already running\n" + " -V --version Show version\n" + " -f --file=FILE Load the specified configuration file instead of\n" + " "AVAHI_CONFIG_FILE"\n" + " --no-rlimits Don't enforce resource limits\n" + " --no-drop-root Don't drop privileges\n" + " --debug Increase verbosity\n", + argv0); +} + + +static int parse_command_line(DaemonConfig *c, int argc, char *argv[]) { + int o; + + enum { + OPTION_NO_RLIMITS = 256, + OPTION_NO_DROP_ROOT, + OPTION_DEBUG + }; + + static const struct option long_options[] = { + { "help", no_argument, NULL, 'h' }, + { "daemonize", no_argument, NULL, 'D' }, + { "kill", no_argument, NULL, 'k' }, + { "version", no_argument, NULL, 'V' }, + { "file", required_argument, NULL, 'f' }, + { "reload", no_argument, NULL, 'r' }, + { "check", no_argument, NULL, 'c' }, + { "syslog", no_argument, NULL, 's' }, + { "no-rlimits", no_argument, NULL, OPTION_NO_RLIMITS }, + { "no-drop-root", no_argument, NULL, OPTION_NO_DROP_ROOT }, + { "debug", no_argument, NULL, OPTION_DEBUG }, + { NULL, 0, NULL, 0 } + }; + + assert(c); + + opterr = 0; + while ((o = getopt_long(argc, argv, "hDkVf:rcs", long_options, NULL)) >= 0) { + + switch(o) { + case 's': + c->use_syslog = 1; + break; + case 'h': + c->command = DAEMON_HELP; + break; + case 'D': + c->daemonize = 1; + break; + case 'k': + c->command = DAEMON_KILL; + break; + case 'V': + c->command = DAEMON_VERSION; + break; + case 'f': + avahi_free(c->config_file); + c->config_file = avahi_strdup(optarg); + break; + case 'r': + c->command = DAEMON_RELOAD; + break; + case 'c': + c->command = DAEMON_CHECK; + break; + case OPTION_NO_RLIMITS: + c->no_rlimits = 1; + break; + case OPTION_NO_DROP_ROOT: + c->drop_root = 0; + break; + case OPTION_DEBUG: + c->debug = 1; + break; + default: + fprintf(stderr, "Invalid command line argument: %c\n", o); + return -1; + } + } + + if (optind < argc) { + fprintf(stderr, "Too many arguments\n"); + return -1; + } + + return 0; +} + +static int is_yes(const char *s) { + assert(s); + + return *s == 'y' || *s == 'Y'; +} + +static int load_config_file(DaemonConfig *c) { + int r = -1; + AvahiIniFile *f; + AvahiIniFileGroup *g; + + assert(c); + + if (!(f = avahi_ini_file_load(c->config_file ? c->config_file : AVAHI_CONFIG_FILE))) goto finish; + + for (g = f->groups; g; g = g->groups_next) { + + if (strcasecmp(g->name, "server") == 0) { + AvahiIniFilePair *p; + + for (p = g->pairs; p; p = p->pairs_next) { + + if (strcasecmp(p->key, "host-name") == 0) { + avahi_free(c->server_config.host_name); + c->server_config.host_name = avahi_strdup(p->value); + } else if (strcasecmp(p->key, "domain-name") == 0) { + avahi_free(c->server_config.domain_name); + c->server_config.domain_name = avahi_strdup(p->value); + } else if (strcasecmp(p->key, "use-ipv4") == 0) + c->server_config.use_ipv4 = is_yes(p->value); + else if (strcasecmp(p->key, "use-ipv6") == 0) + c->server_config.use_ipv6 = is_yes(p->value); + else if (strcasecmp(p->key, "check-response-ttl") == 0) + c->server_config.check_response_ttl = is_yes(p->value); + else if (strcasecmp(p->key, "use-iff-running") == 0) + c->server_config.use_iff_running = is_yes(p->value); + else if (strcasecmp(p->key, "disallow-other-stacks") == 0) + c->server_config.disallow_other_stacks = is_yes(p->value); + else if (strcasecmp(p->key, "enable-dbus") == 0) { + + if (*(p->value) == 'w' || *(p->value) == 'W') { + c->fail_on_missing_dbus = 0; + c->enable_dbus = 1; + } else if (*(p->value) == 'y' || *(p->value) == 'Y') { + c->fail_on_missing_dbus = 1; + c->enable_dbus = 1; + } else { + c->enable_dbus = 0; + } + } else if (strcasecmp(p->key, "drop-root") == 0) + c->drop_root = is_yes(p->value); + else if (strcasecmp(p->key, "add-service-cookie") == 0) + c->server_config.add_service_cookie = is_yes(p->value); + else { + avahi_log_error("Invalid configuration key \"%s\" in group \"%s\"\n", p->key, g->name); + goto finish; + } + } + + } else if (strcasecmp(g->name, "publish") == 0) { + AvahiIniFilePair *p; + + for (p = g->pairs; p; p = p->pairs_next) { + + if (strcasecmp(p->key, "publish-addresses") == 0) + c->server_config.publish_addresses = is_yes(p->value); + else if (strcasecmp(p->key, "publish-hinfo") == 0) + c->server_config.publish_hinfo = is_yes(p->value); + else if (strcasecmp(p->key, "publish-workstation") == 0) + c->server_config.publish_workstation = is_yes(p->value); + else if (strcasecmp(p->key, "publish-domain") == 0) + c->server_config.publish_domain = is_yes(p->value); + else if (strcasecmp(p->key, "publish-resolv-conf-dns-servers") == 0) + c->publish_resolv_conf = is_yes(p->value); + else if (strcasecmp(p->key, "publish-dns-servers") == 0) { + avahi_strfreev(c->publish_dns_servers); + c->publish_dns_servers = avahi_split_csv(p->value); + } else { + avahi_log_error("Invalid configuration key \"%s\" in group \"%s\"\n", p->key, g->name); + goto finish; + } + } + + } else if (strcasecmp(g->name, "wide-area") == 0) { + AvahiIniFilePair *p; + + for (p = g->pairs; p; p = p->pairs_next) { + + if (strcasecmp(p->key, "enable-wide-area") == 0) + c->server_config.enable_wide_area = is_yes(p->value); + else { + avahi_log_error("Invalid configuration key \"%s\" in group \"%s\"\n", p->key, g->name); + goto finish; + } + } + + } else if (strcasecmp(g->name, "reflector") == 0) { + AvahiIniFilePair *p; + + for (p = g->pairs; p; p = p->pairs_next) { + + if (strcasecmp(p->key, "enable-reflector") == 0) + c->server_config.enable_reflector = is_yes(p->value); + else if (strcasecmp(p->key, "reflect-ipv") == 0) + c->server_config.reflect_ipv = is_yes(p->value); + else { + avahi_log_error("Invalid configuration key \"%s\" in group \"%s\"\n", p->key, g->name); + goto finish; + } + } + + } else if (strcasecmp(g->name, "rlimits") == 0) { + AvahiIniFilePair *p; + + for (p = g->pairs; p; p = p->pairs_next) { + + if (strcasecmp(p->key, "rlimit-as") == 0) { + c->rlimit_as_set = 1; + c->rlimit_as = atoi(p->value); + } else if (strcasecmp(p->key, "rlimit-core") == 0) { + c->rlimit_core_set = 1; + c->rlimit_core = atoi(p->value); + } else if (strcasecmp(p->key, "rlimit-data") == 0) { + c->rlimit_data_set = 1; + c->rlimit_data = atoi(p->value); + } else if (strcasecmp(p->key, "rlimit-fsize") == 0) { + c->rlimit_fsize_set = 1; + c->rlimit_fsize = atoi(p->value); + } else if (strcasecmp(p->key, "rlimit-nofile") == 0) { + c->rlimit_nofile_set = 1; + c->rlimit_nofile = atoi(p->value); + } else if (strcasecmp(p->key, "rlimit-stack") == 0) { + c->rlimit_stack_set = 1; + c->rlimit_stack = atoi(p->value); +#ifdef RLIMIT_NPROC + } else if (strcasecmp(p->key, "rlimit-nproc") == 0) { + c->rlimit_nproc_set = 1; + c->rlimit_nproc = atoi(p->value); #endif + } else { + avahi_log_error("Invalid configuration key \"%s\" in group \"%s\"\n", p->key, g->name); + goto finish; + } + + } + + } else { + avahi_log_error("Invalid configuration file group \"%s\".\n", g->name); + goto finish; + } + } + + r = 0; + +finish: + + if (f) + avahi_ini_file_free(f); + + return r; +} + +static void log_function(AvahiLogLevel level, const char *txt) { + + static const int log_level_map[] = { + LOG_ERR, + LOG_WARNING, + LOG_NOTICE, + LOG_INFO, + LOG_DEBUG + }; + + assert(level < AVAHI_LOG_LEVEL_MAX); + assert(txt); + + if (!config.debug && level == AVAHI_LOG_DEBUG) + return; + + daemon_log(log_level_map[level], "%s", txt); +} + +static void dump(const char *text, void* userdata) { + avahi_log_info("%s", text); +} + +static void signal_callback(AvahiWatch *watch, int fd, AvahiWatchEvent event, void *userdata) { + int sig; + const AvahiPoll *poll_api; + + assert(watch); + assert(simple_poll_api); + + poll_api = avahi_simple_poll_get(simple_poll_api); + + if ((sig = daemon_signal_next()) <= 0) { + avahi_log_error("daemon_signal_next() failed"); + poll_api->watch_free(watch); + return; + } + + switch (sig) { + case SIGINT: + case SIGQUIT: + case SIGTERM: + avahi_log_info( + "Got %s, quitting.", + sig == SIGINT ? "SIGINT" : + (sig == SIGQUIT ? "SIGQUIT" : "SIGTERM")); + avahi_simple_poll_quit(simple_poll_api); + break; + + case SIGHUP: + avahi_log_info("Got SIGHUP, reloading."); + static_service_load(); + static_service_add_to_server(); + + if (resolv_conf_entry_group) + avahi_s_entry_group_reset(resolv_conf_entry_group); + + load_resolv_conf(&config); + + update_wide_area_servers(); + + if (config.publish_resolv_conf && resolv_conf && resolv_conf[0]) + resolv_conf_entry_group = add_dns_servers(avahi_server, resolv_conf_entry_group, resolv_conf); + + break; + + case SIGUSR1: + avahi_log_info("Got SIGUSR1, dumping record data."); + avahi_server_dump(avahi_server, dump, NULL); + break; + + default: + avahi_log_warn("Got spurious signal, ignoring."); + break; + } +} + +static int run_server(DaemonConfig *c) { + int r = -1; + int error; + const AvahiPoll *poll_api; + AvahiWatch *sig_watch; + + assert(c); + + if (!(simple_poll_api = avahi_simple_poll_new())) { + avahi_log_error("Failed to create main loop object."); + goto finish; + } + + poll_api = avahi_simple_poll_get(simple_poll_api); + + if (daemon_signal_init(SIGINT, SIGQUIT, SIGHUP, SIGTERM, SIGUSR1, 0) < 0) { + avahi_log_error("Could not register signal handlers (%s).", strerror(errno)); + goto finish; + } + + if (!(sig_watch = poll_api->watch_new(poll_api, daemon_signal_fd(), AVAHI_WATCH_IN, signal_callback, simple_poll_api))) { + avahi_log_error( "Failed to create signal watcher"); + goto finish; + } - if (!(avahi_server = avahi_server_new(NULL, &config, server_callback, NULL))) + if (simple_protocol_setup(poll_api) < 0) goto finish; + if (c->enable_dbus) { +#ifdef HAVE_DBUS + if (dbus_protocol_setup(poll_api) < 0) { + + if (c->fail_on_missing_dbus) + goto finish; + avahi_log_warn("WARNING: Failed to contact D-BUS daemon, disabling D-BUS support."); + c->enable_dbus = 0; + } +#else + avahi_log_warn("WARNING: We are configured to enable D-BUS but it was not compiled in."); + c->enable_dbus = 0; +#endif + } + + load_resolv_conf(c); static_service_load(); - g_main_loop_run(loop); + if (!(avahi_server = avahi_server_new(poll_api, &c->server_config, server_callback, c, &error))) { + avahi_log_error("Failed to create server: %s", avahi_strerror(error)); + goto finish; + } - r = 0; + update_wide_area_servers(); + + if (c->daemonize) + daemon_retval_send(0); + + for (;;) { + if ((r = avahi_simple_poll_iterate(simple_poll_api, -1)) < 0) { + + /* We handle signals through an FD, so let's continue */ + if (errno == EINTR) + continue; + + avahi_log_error("poll(): %s", strerror(errno)); + goto finish; + } else if (r > 0) + /* Quit */ + break; + } -finish: +finish: + static_service_remove_from_server(); static_service_free_all(); + remove_dns_server_entry_groups(); simple_protocol_shutdown(); #ifdef ENABLE_DBUS - dbus_protocol_shutdown(); + if (c->enable_dbus) + dbus_protocol_shutdown(); #endif - if (avahi_server) + if (avahi_server) { avahi_server_free(avahi_server); + avahi_server = NULL; + } + + daemon_signal_done(); + + if (sig_watch) + poll_api->watch_free(sig_watch); + + if (simple_poll_api) { + avahi_simple_poll_free(simple_poll_api); + simple_poll_api = NULL; + } + + if (r != 0 && c->daemonize) + daemon_retval_send(1); + + return r; +} + +#define set_env(key, value) putenv(avahi_strdup_printf("%s=%s", (key), (value))) + +static int drop_root(void) { + struct passwd *pw; + struct group * gr; + int r; + + if (!(pw = getpwnam(AVAHI_USER))) { + avahi_log_error( "Failed to find user '"AVAHI_USER"'."); + return -1; + } + + if (!(gr = getgrnam(AVAHI_GROUP))) { + avahi_log_error( "Failed to find group '"AVAHI_GROUP"'."); + return -1; + } + + avahi_log_info("Found user '"AVAHI_USER"' (UID %lu) and group '"AVAHI_GROUP"' (GID %lu).", (unsigned long) pw->pw_uid, (unsigned long) gr->gr_gid); + + if (initgroups(AVAHI_USER, gr->gr_gid) != 0) { + avahi_log_error("Failed to change group list: %s", strerror(errno)); + return -1; + } + +#if defined(HAVE_SETRESGID) + r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid); +#elif defined(HAVE_SETEGID) + if ((r = setgid(gr->gr_gid)) >= 0) + r = setegid(gr->gr_gid); +#elif defined(HAVE_SETREGID) + r = setregid(gr->gr_gid, gr->gr_gid); +#else +#error "No API to drop priviliges" +#endif + + if (r < 0) { + avahi_log_error("Failed to change GID: %s", strerror(errno)); + return -1; + } + +#if defined(HAVE_SETRESUID) + r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid); +#elif defined(HAVE_SETEUID) + if ((r = setuid(pw->pw_uid)) >= 0) + r = seteuid(pw->pw_uid); +#elif defined(HAVE_SETREUID) + r = setreuid(pw->pw_uid, pw->pw_uid); +#else +#error "No API to drop priviliges" +#endif + + if (r < 0) { + avahi_log_error("Failed to change UID: %s", strerror(errno)); + return -1; + } + + set_env("USER", pw->pw_name); + set_env("LOGNAME", pw->pw_name); + set_env("HOME", pw->pw_dir); + + avahi_log_info("Successfully dropped root privileges."); + + return 0; +} + +static const char* pid_file_proc(void) { + return AVAHI_DAEMON_RUNTIME_DIR"/pid"; +} + +static int make_runtime_dir(void) { + int r = -1; + mode_t u; + int reset_umask = 0; + struct passwd *pw; + struct group * gr; + struct stat st; + + if (!(pw = getpwnam(AVAHI_USER))) { + avahi_log_error( "Failed to find user '"AVAHI_USER"'."); + goto fail; + } + + if (!(gr = getgrnam(AVAHI_GROUP))) { + avahi_log_error( "Failed to find group '"AVAHI_GROUP"'."); + goto fail; + } + + u = umask(0000); + reset_umask = 1; + + if (mkdir(AVAHI_DAEMON_RUNTIME_DIR, 0755) < 0 && errno != EEXIST) { + avahi_log_error("mkdir(\""AVAHI_DAEMON_RUNTIME_DIR"\"): %s", strerror(errno)); + goto fail; + } - if (loop) - g_main_loop_unref(loop); + chown(AVAHI_DAEMON_RUNTIME_DIR, pw->pw_uid, gr->gr_gid); - avahi_server_config_free(&config); + if (stat(AVAHI_DAEMON_RUNTIME_DIR, &st) < 0) { + avahi_log_error("stat(): %s\n", strerror(errno)); + goto fail; + } + + if (!S_ISDIR(st.st_mode) || st.st_uid != pw->pw_uid || st.st_gid != gr->gr_gid) { + avahi_log_error("Failed to create runtime directory "AVAHI_DAEMON_RUNTIME_DIR"."); + goto fail; + } + + r = 0; + +fail: + if (reset_umask) + umask(u); + return r; +} + +static void set_one_rlimit(int resource, rlim_t limit, const char *name) { + struct rlimit rl; + rl.rlim_cur = rl.rlim_max = limit; + + if (setrlimit(resource, &rl) < 0) + avahi_log_warn("setrlimit(%s, {%u, %u}) failed: %s", name, (unsigned) limit, (unsigned) limit, strerror(errno)); +} + +static void enforce_rlimits(void) { + + if (config.rlimit_as_set) + set_one_rlimit(RLIMIT_AS, config.rlimit_as, "RLIMIT_AS"); + if (config.rlimit_core_set) + set_one_rlimit(RLIMIT_CORE, config.rlimit_core, "RLIMIT_CORE"); + if (config.rlimit_data_set) + set_one_rlimit(RLIMIT_DATA, config.rlimit_data, "RLIMIT_DATA"); + if (config.rlimit_fsize_set) + set_one_rlimit(RLIMIT_FSIZE, config.rlimit_fsize, "RLIMIT_FSIZE"); + if (config.rlimit_nofile_set) + set_one_rlimit(RLIMIT_NOFILE, config.rlimit_nofile, "RLIMIT_NOFILE"); + if (config.rlimit_stack_set) + set_one_rlimit(RLIMIT_STACK, config.rlimit_stack, "RLIMIT_STACK"); +#ifdef RLIMIT_NPROC + if (config.rlimit_nproc_set) + set_one_rlimit(RLIMIT_NPROC, config.rlimit_nproc, "RLIMIT_NPROC"); +#endif + +#ifdef RLIMIT_MEMLOCK + /* We don't need locked memory */ + set_one_rlimit(RLIMIT_MEMLOCK, 0, "RLIMIT_MEMLOCK"); +#endif +} + +#define RANDOM_DEVICE "/dev/urandom" + +static void init_rand_seed(void) { + int fd; + unsigned seed = 0; + + /* Try to initialize seed from /dev/urandom, to make it a little + * less predictable, and to make sure that multiple machines + * booted at the same time choose different random seeds. */ + if ((fd = open(RANDOM_DEVICE, O_RDONLY)) >= 0) { + read(fd, &seed, sizeof(seed)); + close(fd); + } + + /* If the initialization failed by some reason, we add the time to the seed*/ + seed |= (unsigned) time(NULL); + + srand(seed); +} +int main(int argc, char *argv[]) { + int r = 255; + const char *argv0; + int wrote_pid_file = 0; + + avahi_set_log_function(log_function); + + init_rand_seed(); + + avahi_server_config_init(&config.server_config); + config.command = DAEMON_RUN; + config.daemonize = 0; + config.config_file = NULL; +#ifdef HAVE_DBUS + config.enable_dbus = 1; + config.fail_on_missing_dbus = 1; +#else + config.enable_dbus = 0; + config.fail_on_missing_dbus = 0; +#endif + config.drop_root = 1; + config.publish_dns_servers = NULL; + config.publish_resolv_conf = 0; + config.use_syslog = 0; + config.no_rlimits = 0; + config.debug = 0; + + config.rlimit_as_set = 0; + config.rlimit_core_set = 0; + config.rlimit_data_set = 0; + config.rlimit_fsize_set = 0; + config.rlimit_nofile_set = 0; + config.rlimit_stack_set = 0; +#ifdef RLIMIT_NPROC + config.rlimit_nproc_set = 0; +#endif + + if ((argv0 = strrchr(argv[0], '/'))) + argv0++; + else + argv0 = argv[0]; + + daemon_pid_file_ident = (const char *) argv0; + daemon_log_ident = (char*) argv0; + daemon_pid_file_proc = pid_file_proc; + + if (parse_command_line(&config, argc, argv) < 0) + goto finish; + + if (config.command == DAEMON_HELP) { + help(stdout, argv0); + r = 0; + } else if (config.command == DAEMON_VERSION) { + printf("%s "PACKAGE_VERSION"\n", argv0); + r = 0; + } else if (config.command == DAEMON_KILL) { + if (daemon_pid_file_kill_wait(SIGTERM, 5) < 0) { + avahi_log_warn("Failed to kill daemon: %s", strerror(errno)); + goto finish; + } + + r = 0; + + } else if (config.command == DAEMON_RELOAD) { + if (daemon_pid_file_kill(SIGHUP) < 0) { + avahi_log_warn("Failed to kill daemon: %s", strerror(errno)); + goto finish; + } + + r = 0; + + } else if (config.command == DAEMON_CHECK) + r = (daemon_pid_file_is_running() >= 0) ? 0 : 1; + else if (config.command == DAEMON_RUN) { + pid_t pid; + + if (getuid() != 0 && config.drop_root) { + avahi_log_error("This program is intended to be run as root."); + goto finish; + } + + if ((pid = daemon_pid_file_is_running()) >= 0) { + avahi_log_error("Daemon already running on PID %u", pid); + goto finish; + } + + if (load_config_file(&config) < 0) + goto finish; + + if (config.daemonize) { + daemon_retval_init(); + + if ((pid = daemon_fork()) < 0) + goto finish; + else if (pid != 0) { + int ret; + /** Parent **/ + + if ((ret = daemon_retval_wait(20)) < 0) { + avahi_log_error("Could not recieve return value from daemon process."); + goto finish; + } + + r = ret; + goto finish; + } + + /* Child */ + } + + if (config.use_syslog || config.daemonize) + daemon_log_use = DAEMON_LOG_SYSLOG; + + if (make_runtime_dir() < 0) + goto finish; + + if (config.drop_root) { + if (drop_root() < 0) + goto finish; + } + + if (daemon_pid_file_create() < 0) { + avahi_log_error("Failed to create PID file: %s", strerror(errno)); + + if (config.daemonize) + daemon_retval_send(1); + goto finish; + } else + wrote_pid_file = 1; + + if (!config.no_rlimits) + enforce_rlimits(); + + chdir("/"); + + avahi_log_info("%s "PACKAGE_VERSION" starting up.", argv0); + + if (run_server(&config) == 0) + r = 0; + } + +finish: + + if (config.daemonize) + daemon_retval_done(); + + avahi_server_config_free(&config.server_config); + avahi_free(config.config_file); + avahi_strfreev(config.publish_dns_servers); + avahi_strfreev(resolv_conf); + + if (wrote_pid_file) + daemon_pid_file_remove(); + return r; }