/* Icecast * * This program is distributed under the GNU General Public License, version 2. * A copy of this license is included with this source. * * Copyright 2000-2004, Jack Moffitt , * oddsock , * Karl Heyes * and others (see AUTHORS for details). * Copyright 2013-2018, Philipp "ph3-der-loewe" Schafft , */ /* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include "common/thread/thread.h" #include "yp.h" #include "global.h" #include "curl.h" #include "logging.h" #include "source.h" #include "cfgfile.h" #include "stats.h" #ifdef WIN32 #define snprintf _snprintf #endif #define CATMODULE "yp" struct yp_server { char *url; char *server_id; unsigned url_timeout; unsigned touch_interval; int remove; CURL *curl; struct ypdata_tag *mounts, *pending_mounts; struct yp_server *next; char curl_error[CURL_ERROR_SIZE]; }; typedef struct ypdata_tag { int remove; int release; int cmd_ok; char *sid; char *mount; char *url; char *listen_url; char *server_name; char *server_desc; char *server_genre; char *cluster_password; char *bitrate; char *audio_info; char *server_type; char *current_song; char *subtype; struct yp_server *server; time_t next_update; unsigned touch_interval; char *error_msg; int (*process)(struct ypdata_tag *yp, char *s, unsigned len); struct ypdata_tag *next; } ypdata_t; static rwlock_t yp_lock; static mutex_t yp_pending_lock; static volatile struct yp_server *active_yps = NULL, *pending_yps = NULL; static volatile int yp_update = 0; static int yp_running; static time_t now; static thread_type *yp_thread; static volatile unsigned client_limit = 0; static volatile char *server_version = NULL; static void *yp_update_thread(void *arg); static void add_yp_info(ypdata_t *yp, void *info, int type); static int do_yp_remove(ypdata_t *yp, char *s, unsigned len); static int do_yp_add(ypdata_t *yp, char *s, unsigned len); static int do_yp_touch(ypdata_t *yp, char *s, unsigned len); static void add_pending_yp (struct yp_server *server); static void delete_marked_yp(struct yp_server *server); static void yp_destroy_ypdata(ypdata_t *ypdata); /* curl callback used to parse headers coming back from the YP server */ static size_t handle_returned_header (void *ptr, size_t size, size_t nmemb, void *stream) { ypdata_t *yp = stream; size_t bytes = size * nmemb; /* ICECAST_LOG_DEBUG("header from YP is \"%.*s\"", bytes, ptr); */ if (strncasecmp (ptr, "YPResponse: 1", 13) == 0) yp->cmd_ok = 1; if (strncasecmp (ptr, "YPMessage: ", 11) == 0) { size_t len = bytes - 11; free (yp->error_msg); yp->error_msg = calloc (1, len); if (yp->error_msg) sscanf (ptr + 11, "%[^\r\n]", yp->error_msg); } if (yp->process == do_yp_add) { if (strncasecmp (ptr, "SID: ", 5) == 0) { size_t len = bytes - 5; free (yp->sid); yp->sid = calloc (1, len); if (yp->sid) sscanf (ptr + 5, "%[^\r\n]", yp->sid); } } if (strncasecmp (ptr, "TouchFreq: ", 11) == 0) { unsigned secs; if ( sscanf (ptr + 11, "%u", &secs) != 1 ) secs = 0; if (secs < 30) secs = 30; ICECAST_LOG_DEBUG("server touch interval is %u", secs); yp->touch_interval = secs; } return (size_t)bytes; } /* search the active and pending YP server lists */ static struct yp_server *find_yp_server (const char *url) { struct yp_server *server; server = (struct yp_server *)active_yps; while (server) { if (strcmp (server->url, url) == 0) return server; server = server->next; } server = (struct yp_server *)pending_yps; while (server) { if (strcmp (server->url, url) == 0) break; server = server->next; } return server; } static void destroy_yp_server (struct yp_server *server) { ypdata_t *yp; if (server == NULL) return; ICECAST_LOG_DEBUG("Removing YP server entry for %s", server->url); /* delete yps: * first move all pendings into main queue. * then mark all main queue entries for deleting. * then remove all marked entries. */ add_pending_yp(server); yp = server->mounts; while (yp) { yp->remove = 1; yp = yp->next; } delete_marked_yp(server); icecast_curl_free(server->curl); if (server->mounts) ICECAST_LOG_WARN("active ypdata not freed"); if (server->pending_mounts) ICECAST_LOG_WARN("pending ypdata not freed"); free (server->url); free (server->server_id); free (server); } /* search for a ypdata entry corresponding to a specific mountpoint */ static ypdata_t *find_yp_mount (ypdata_t *mounts, const char *mount) { ypdata_t *yp = mounts; while (yp) { if (strcmp (yp->mount, mount) == 0) break; yp = yp->next; } return yp; } void yp_recheck_config (ice_config_t *config) { size_t i; struct yp_server *server; ICECAST_LOG_DEBUG("Updating YP configuration"); thread_rwlock_rlock (&yp_lock); server = (struct yp_server *)active_yps; while (server) { server->remove = 1; server = server->next; } client_limit = config->client_limit; free ((char*)server_version); server_version = strdup (config->server_id); /* for each yp url in config, check to see if one exists if not, then add it. */ for (i=0 ; i < config->num_yp_directories; i++) { server = find_yp_server (config->yp_url[i]); if (server == NULL) { server = calloc (1, sizeof (struct yp_server)); if (server == NULL) { destroy_yp_server (server); break; } server->server_id = strdup ((char *)server_version); server->url = strdup (config->yp_url[i]); server->url_timeout = config->yp_url_timeout[i]; server->touch_interval = config->yp_touch_interval[i]; server->curl = icecast_curl_new(server->url, &(server->curl_error[0])); if (server->curl == NULL) { destroy_yp_server (server); break; } if (server->url_timeout > 10 || server->url_timeout < 1) server->url_timeout = 6; if (server->touch_interval < 30) server->touch_interval = 30; curl_easy_setopt (server->curl, CURLOPT_HEADERFUNCTION, handle_returned_header); server->next = (struct yp_server *)pending_yps; pending_yps = server; ICECAST_LOG_INFO("Adding new YP server \"%s\" (timeout %ds, default interval %ds)", server->url, server->url_timeout, server->touch_interval); } else { server->remove = 0; } } thread_rwlock_unlock (&yp_lock); thread_rwlock_wlock(&yp_lock); yp_update = 1; thread_rwlock_unlock(&yp_lock); } void yp_initialize(void) { ice_config_t *config = config_get_config(); thread_rwlock_create (&yp_lock); thread_mutex_create (&yp_pending_lock); yp_recheck_config (config); config_release_config (); yp_thread = thread_create("YP Touch Thread", yp_update_thread, (void *)NULL, THREAD_ATTACHED); } /* handler for curl, checks if successful handling occurred * return 0 for ok, -1 for this entry failed, -2 for server fail. * On failure case, update and process are modified */ static int send_to_yp (const char *cmd, ypdata_t *yp, char *post) { int curlcode; struct yp_server *server = yp->server; /* ICECAST_LOG_DEBUG("send YP (%s):%s", cmd, post); */ yp->cmd_ok = 0; curl_easy_setopt (server->curl, CURLOPT_POSTFIELDS, post); curl_easy_setopt (server->curl, CURLOPT_WRITEHEADER, yp); curlcode = curl_easy_perform (server->curl); if (curlcode) { yp->process = do_yp_add; yp->next_update = now + 1200; ICECAST_LOG_ERROR("connection to %s failed with \"%s\"", server->url, server->curl_error); return -2; } if (yp->cmd_ok == 0) { if (yp->error_msg == NULL) yp->error_msg = strdup ("no response from server"); if (yp->process == do_yp_add) { ICECAST_LOG_ERROR("YP %s on %s failed: %s", cmd, server->url, yp->error_msg); yp->next_update = now + 7200; } if (yp->process == do_yp_touch) { /* At this point the touch request failed, either because they rejected our session * or the server isn't accessible. This means we have to wait before doing another * add request. We have a minimum delay but we could allow the directory server to * give us a wait time using the TouchFreq header. This time could be given in such * cases as a firewall block or incorrect listenurl. */ if (yp->touch_interval < 1200) yp->next_update = now + 1200; else yp->next_update = now + yp->touch_interval; ICECAST_LOG_INFO("YP %s on %s failed: %s", cmd, server->url, yp->error_msg); } yp->process = do_yp_add; free(yp->sid); yp->sid = NULL; return -1; } ICECAST_LOG_DEBUG("YP %s at %s succeeded", cmd, server->url); return 0; } /* routines for building and issues requests to the YP server */ static int do_yp_remove (ypdata_t *yp, char *s, unsigned len) { int ret = 0; if (yp->sid) { ret = snprintf (s, len, "action=remove&sid=%s", yp->sid); if (ret >= (signed)len) return ret+1; ICECAST_LOG_INFO("clearing up YP entry for %s", yp->mount); ret = send_to_yp ("remove", yp, s); free (yp->sid); yp->sid = NULL; } yp->remove = 1; yp->process = do_yp_add; yp_update = 1; return ret; } static int do_yp_add (ypdata_t *yp, char *s, unsigned len) { int ret; char *value; ice_config_t *config; char *admin; config = config_get_config(); admin = util_url_escape(config->admin); config_release_config(); value = stats_get_value (yp->mount, "server_type"); add_yp_info (yp, value, YP_SERVER_TYPE); free (value); value = stats_get_value (yp->mount, "server_name"); add_yp_info (yp, value, YP_SERVER_NAME); free (value); value = stats_get_value (yp->mount, "server_url"); add_yp_info (yp, value, YP_SERVER_URL); free (value); value = stats_get_value (yp->mount, "genre"); add_yp_info (yp, value, YP_SERVER_GENRE); free (value); value = stats_get_value (yp->mount, "bitrate"); if (value == NULL) value = stats_get_value (yp->mount, "ice-bitrate"); add_yp_info (yp, value, YP_BITRATE); free (value); value = stats_get_value (yp->mount, "server_description"); add_yp_info (yp, value, YP_SERVER_DESC); free (value); value = stats_get_value (yp->mount, "subtype"); add_yp_info (yp, value, YP_SUBTYPE); free (value); value = stats_get_value (yp->mount, "audio_info"); add_yp_info (yp, value, YP_AUDIO_INFO); free (value); ret = snprintf (s, len, "action=add&admin=%s&sn=%s&genre=%s&cpswd=%s&desc=" "%s&url=%s&listenurl=%s&type=%s&stype=%s&b=%s&%s\r\n", admin, yp->server_name, yp->server_genre, yp->cluster_password, yp->server_desc, yp->url, yp->listen_url, yp->server_type, yp->subtype, yp->bitrate, yp->audio_info); free(admin); if (ret >= (signed)len) return ret+1; ret = send_to_yp ("add", yp, s); if (ret == 0) { yp->process = do_yp_touch; /* force first touch in 5 secs */ yp->next_update = time(NULL) + 5; } return ret; } static int do_yp_touch (ypdata_t *yp, char *s, unsigned len) { unsigned listeners = 0, max_listeners = 1; char *val, *artist, *title; int ret; artist = (char *)stats_get_value (yp->mount, "artist"); title = (char *)stats_get_value (yp->mount, "title"); if (artist || title) { char *song; const char *separator = " - "; if (artist == NULL) { artist = strdup(""); separator = ""; } if (title == NULL) title = strdup(""); song = malloc (strlen (artist) + strlen (title) + strlen (separator) +1); if (song) { sprintf (song, "%s%s%s", artist, separator, title); add_yp_info(yp, song, YP_CURRENT_SONG); stats_event (yp->mount, "yp_currently_playing", song); free (song); } } free (artist); free (title); val = (char *)stats_get_value (yp->mount, "listeners"); if (val) { listeners = atoi (val); free (val); } val = stats_get_value (yp->mount, "max_listeners"); if (val == NULL || strcmp (val, "unlimited") == 0 || atoi(val) < 0) max_listeners = client_limit; else max_listeners = atoi (val); free (val); val = stats_get_value (yp->mount, "subtype"); if (val) { add_yp_info (yp, val, YP_SUBTYPE); free (val); } ret = snprintf (s, len, "action=touch&sid=%s&st=%s" "&listeners=%u&max_listeners=%u&stype=%s\r\n", yp->sid, yp->current_song, listeners, max_listeners, yp->subtype); if (ret >= (signed)len) return ret+1; /* space required for above text and nul*/ if (send_to_yp ("touch", yp, s) == 0) { yp->next_update = now + yp->touch_interval; return 0; } return -1; } static int process_ypdata(struct yp_server *server, ypdata_t *yp) { unsigned len = 1024; char *s = NULL, *tmp; if (now < yp->next_update) return 0; /* loop just in case the memory area isn't big enough */ while (1) { int ret; if ((tmp = realloc(s, len)) == NULL) return 0; s = tmp; if (yp->release) { yp->process = do_yp_remove; yp->next_update = 0; } ret = yp->process (yp, s, len); if (ret <= 0) { free (s); return ret; } len = ret; } return 0; } static void yp_process_server (struct yp_server *server) { ypdata_t *yp; int state = 0; /* ICECAST_LOG_DEBUG("processing yp server %s", server->url); */ yp = server->mounts; while (yp) { now = time (NULL); /* if one of the streams shows that the server cannot be contacted then mark the * other entries for an update later. Assume YP server is dead and skip it for now */ if (state == -2) { ICECAST_LOG_DEBUG("skipping %s on %s", yp->mount, server->url); yp->process = do_yp_add; yp->next_update += 900; } else state = process_ypdata (server, yp); yp = yp->next; } } static ypdata_t *create_yp_entry (const char *mount) { ypdata_t *yp; char *s; yp = calloc (1, sizeof (ypdata_t)); do { unsigned len = 512; ssize_t ret; char *url; mount_proxy *mountproxy = NULL; ice_config_t *config; if (yp == NULL) break; yp->mount = strdup (mount); yp->server_name = strdup (""); yp->server_desc = strdup (""); yp->server_genre = strdup (""); yp->bitrate = strdup (""); yp->server_type = strdup (""); yp->cluster_password = strdup (""); yp->url = strdup (""); yp->current_song = strdup (""); yp->audio_info = strdup (""); yp->subtype = strdup (""); yp->process = do_yp_add; url = malloc (len); if (url == NULL) break; ret = client_get_baseurl(NULL, NULL, url, len, NULL, NULL, NULL, mount, NULL); if (ret >= len) { // Buffer was too small, allocate a big enough one s = realloc (url, ret + 1); if (!s) { free(url); break; } url = s; ret = client_get_baseurl(NULL, NULL, url, len, NULL, NULL, NULL, mount, NULL); } if (ret < 0 || ret >= len) break; config = config_get_config(); mountproxy = config_find_mount (config, mount, MOUNT_TYPE_NORMAL); if (mountproxy && mountproxy->cluster_password) add_yp_info (yp, mountproxy->cluster_password, YP_CLUSTER_PASSWORD); config_release_config(); yp->listen_url = util_url_escape (url); free (url); if (yp->listen_url == NULL) break; return yp; } while (0); yp_destroy_ypdata (yp); return NULL; } /* Check for changes in the YP servers configured */ static void check_servers (void) { struct yp_server *server = (struct yp_server *)active_yps, **server_p = (struct yp_server **)&active_yps; while (server) { if (server->remove) { struct yp_server *to_go = server; ICECAST_LOG_DEBUG("YP server \"%s\"removed", server->url); *server_p = server->next; server = server->next; destroy_yp_server(to_go); continue; } server_p = &server->next; server = server->next; } /* add new server entries */ while (pending_yps) { avl_node *node; server = (struct yp_server *)pending_yps; pending_yps = server->next; ICECAST_LOG_DEBUG("Add pending yps %s", server->url); server->next = (struct yp_server *)active_yps; active_yps = server; /* new YP server configured, need to populate with existing sources */ avl_tree_rlock (global.source_tree); node = avl_get_first (global.source_tree); while (node) { ypdata_t *yp; source_t *source = node->key; if (source->yp_public && (yp = create_yp_entry (source->mount)) != NULL) { ICECAST_LOG_DEBUG("Adding existing mount %s", source->mount); yp->server = server; yp->touch_interval = server->touch_interval; yp->next = server->mounts; server->mounts = yp; } node = avl_get_next (node); } avl_tree_unlock (global.source_tree); } } static void add_pending_yp (struct yp_server *server) { ypdata_t *current, *yp; unsigned count = 0; if (server->pending_mounts == NULL) return; current = server->mounts; server->mounts = server->pending_mounts; server->pending_mounts = NULL; yp = server->mounts; while (1) { count++; if (yp->next == NULL) break; yp = yp->next; } yp->next = current; ICECAST_LOG_DEBUG("%u YP entries added to %s", count, server->url); } static void delete_marked_yp(struct yp_server *server) { ypdata_t *yp = server->mounts, **prev = &server->mounts; while (yp) { if (yp->remove) { ypdata_t *to_go = yp; ICECAST_LOG_DEBUG("removed %s from YP server %s", yp->mount, server->url); *prev = yp->next; yp = yp->next; yp_destroy_ypdata(to_go); continue; } prev = &yp->next; yp = yp->next; } } static void *yp_update_thread(void *arg) { ICECAST_LOG_INFO("YP update thread started"); int running; yp_running = 1; running = 1; while (running) { struct yp_server *server; thread_sleep (200000); /* do the YP communication */ thread_rwlock_rlock (&yp_lock); server = (struct yp_server *)active_yps; while (server) { /* ICECAST_LOG_DEBUG("trying %s", server->url); */ yp_process_server (server); server = server->next; } /* update the local YP structure */ if (yp_update) { thread_rwlock_unlock(&yp_lock); thread_rwlock_wlock (&yp_lock); check_servers (); server = (struct yp_server *)active_yps; while (server) { /* ICECAST_LOG_DEBUG("Checking yps %s", server->url); */ add_pending_yp (server); delete_marked_yp (server); server = server->next; } yp_update = 0; } running = yp_running; thread_rwlock_unlock(&yp_lock); } thread_rwlock_destroy (&yp_lock); thread_mutex_destroy (&yp_pending_lock); /* free server and ypdata left */ while (active_yps) { struct yp_server *server = (struct yp_server *)active_yps; active_yps = server->next; destroy_yp_server (server); } return NULL; } static void yp_destroy_ypdata(ypdata_t *ypdata) { if (ypdata) { if (ypdata->mount) { free(ypdata->mount); } if (ypdata->url) { free(ypdata->url); } if (ypdata->sid) { free(ypdata->sid); } if (ypdata->server_name) { free(ypdata->server_name); } if (ypdata->server_desc) { free(ypdata->server_desc); } if (ypdata->server_genre) { free(ypdata->server_genre); } if (ypdata->cluster_password) { free(ypdata->cluster_password); } if (ypdata->listen_url) { free(ypdata->listen_url); } if (ypdata->current_song) { free(ypdata->current_song); } if (ypdata->bitrate) { free(ypdata->bitrate); } if (ypdata->server_type) { free(ypdata->server_type); } if (ypdata->audio_info) { free(ypdata->audio_info); } free(ypdata->subtype); free(ypdata->error_msg); free(ypdata); } } static void add_yp_info(ypdata_t *yp, void *info, int type) { char *escaped; if (!info) return; escaped = util_url_escape(info); if (escaped == NULL) return; switch (type) { case YP_SERVER_NAME: free (yp->server_name); yp->server_name = escaped; break; case YP_SERVER_DESC: free (yp->server_desc); yp->server_desc = escaped; break; case YP_SERVER_GENRE: free (yp->server_genre); yp->server_genre = escaped; break; case YP_SERVER_URL: free (yp->url); yp->url = escaped; break; case YP_BITRATE: free (yp->bitrate); yp->bitrate = escaped; break; case YP_AUDIO_INFO: free (yp->audio_info); yp->audio_info = escaped; break; case YP_SERVER_TYPE: free (yp->server_type); yp->server_type = escaped; break; case YP_CURRENT_SONG: free (yp->current_song); yp->current_song = escaped; break; case YP_CLUSTER_PASSWORD: free (yp->cluster_password); yp->cluster_password = escaped; break; case YP_SUBTYPE: free (yp->subtype); yp->subtype = escaped; break; default: free (escaped); } } /* Add YP entries to active servers */ void yp_add (const char *mount) { struct yp_server *server; /* make sure YP thread is not modifying the lists */ thread_rwlock_rlock (&yp_lock); /* make sure we don't race against another yp_add */ thread_mutex_lock (&yp_pending_lock); server = (struct yp_server *)active_yps; while (server) { ypdata_t *yp; /* on-demand relays may already have a YP entry */ yp = find_yp_mount (server->mounts, mount); if (yp == NULL) { /* add new ypdata to each servers pending yp */ yp = create_yp_entry (mount); if (yp) { ICECAST_LOG_DEBUG("Adding %s to %s", mount, server->url); yp->server = server; yp->touch_interval = server->touch_interval; yp->next = server->pending_mounts; yp->next_update = time(NULL) + 60; server->pending_mounts = yp; yp_update = 1; } } else ICECAST_LOG_DEBUG("YP entry %s already exists", mount); server = server->next; } thread_mutex_unlock (&yp_pending_lock); thread_rwlock_unlock (&yp_lock); } /* Mark an existing entry in the YP list as to be marked for deletion */ void yp_remove (const char *mount) { struct yp_server *server = (struct yp_server *)active_yps; thread_rwlock_rlock (&yp_lock); while (server) { ypdata_t *list = server->mounts; while (1) { ypdata_t *yp = find_yp_mount (list, mount); if (yp == NULL) break; if (yp->release || yp->remove) { list = yp->next; continue; /* search again these are old entries */ } ICECAST_LOG_DEBUG("release %s on YP %s", mount, server->url); yp->release = 1; yp->next_update = 0; } server = server->next; } thread_rwlock_unlock (&yp_lock); } /* This is similar to yp_remove, but we force a touch * attempt */ void yp_touch (const char *mount) { struct yp_server *server = (struct yp_server *)active_yps; ypdata_t *search_list = NULL; thread_rwlock_rlock (&yp_lock); if (server) search_list = server->mounts; while (server) { ypdata_t *yp = find_yp_mount (search_list, mount); if (yp) { /* we may of found old entries not purged yet, so skip them */ if (yp->release != 0 || yp->remove != 0) { search_list = yp->next; continue; } /* don't update the directory if there is a touch scheduled soon */ if (yp->process == do_yp_touch && now + yp->touch_interval - yp->next_update > 60) yp->next_update = now + 3; } server = server->next; if (server) search_list = server->mounts; } thread_rwlock_unlock (&yp_lock); } void yp_shutdown (void) { thread_rwlock_wlock(&yp_lock); yp_running = 0; yp_update = 1; thread_rwlock_unlock(&yp_lock); if (yp_thread) thread_join (yp_thread); free ((char*)server_version); server_version = NULL; ICECAST_LOG_INFO("YP thread down"); }