/* 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 2011, Dave 'justdave' Miller , * Copyright 2011-2022, Philipp "ph3-der-loewe" Schafft , */ /* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #ifdef HAVE_POLL #include #endif #include #ifndef _WIN32 #include #include #else #include #endif #include "common/thread/thread.h" #include "common/avl/avl.h" #include "common/net/sock.h" #include "common/httpp/httpp.h" #include "compat.h" #include "connection.h" #include "cfgfile.h" #include "global.h" #include "util.h" #include "refobject.h" #include "refbuf.h" #include "client.h" #include "errors.h" #include "stats.h" #include "logging.h" #include "fserve.h" #include "slave.h" #include "source.h" #include "admin.h" #include "auth.h" #include "matchfile.h" #include "tls.h" #include "acl.h" #include "refobject.h" #include "listensocket.h" #include "fastevent.h" #include "navigation.h" #define CATMODULE "connection" /* Two different major types of source authentication. Shoutcast style is used only by the Shoutcast DSP and is a crazy version of HTTP. It looks like : Source Client -> Connects to port + 1 Source Client -> sends encoder password (plaintext)\r\n Icecast -> reads encoder password, if ok, sends OK2\r\n, else disconnects Source Client -> reads OK2\r\n, then sends http-type request headers that contain the stream details (icy-name, etc..) Icecast -> reads headers, stores them Source Client -> starts sending MP3 data Source Client -> periodically updates metadata via admin.cgi call Icecast auth style uses HTTP and Basic Authorization. */ typedef struct client_queue_tag { client_t *client; int offset; int shoutcast; char *shoutcast_mount; char *bodybuffer; size_t bodybufferlen; int tried_body; struct client_queue_tag *next; } client_queue_t; static spin_t _connection_lock; // protects _current_id, _con_queue, _con_queue_tail static volatile connection_id_t _current_id = 0; static int _initialized = 0; static volatile client_queue_t *_req_queue = NULL, **_req_queue_tail = &_req_queue; static volatile client_queue_t *_con_queue = NULL, **_con_queue_tail = &_con_queue; static volatile client_queue_t *_body_queue = NULL, **_body_queue_tail = &_body_queue; static bool tls_ok = false; static tls_ctx_t *tls_ctx; /* filtering client connection based on IP */ static matchfile_t *banned_ip, *allowed_ip; rwlock_t _source_shutdown_rwlock; static int _update_admin_command(client_t *client); static void _handle_connection(void); static void get_tls_certificate(ice_config_t *config); void connection_initialize(void) { if (_initialized) return; thread_spin_create (&_connection_lock); thread_mutex_create(&move_clients_mutex); thread_rwlock_create(&_source_shutdown_rwlock); thread_cond_create(&global.shutdown_cond); _req_queue = NULL; _req_queue_tail = &_req_queue; _con_queue = NULL; _con_queue_tail = &_con_queue; _body_queue = NULL; _body_queue_tail = &_body_queue; _initialized = 1; } void connection_shutdown(void) { if (!_initialized) return; tls_ctx_unref(tls_ctx); matchfile_release(banned_ip); matchfile_release(allowed_ip); thread_cond_destroy(&global.shutdown_cond); thread_rwlock_destroy(&_source_shutdown_rwlock); thread_spin_destroy (&_connection_lock); thread_mutex_destroy(&move_clients_mutex); _initialized = 0; } void connection_reread_config(ice_config_t *config) { get_tls_certificate(config); listensocket_container_configure_and_setup(global.listensockets, config); } static connection_id_t _next_connection_id(void) { connection_id_t id; thread_spin_lock(&_connection_lock); id = _current_id++; thread_spin_unlock(&_connection_lock); return id; } #ifdef ICECAST_CAP_TLS static void get_tls_certificate(ice_config_t *config) { const char *keyfile; tls_ok = false; keyfile = config->tls_context.key_file; if (!keyfile) keyfile = config->tls_context.cert_file; tls_ctx_unref(tls_ctx); tls_ctx = tls_ctx_new(config->tls_context.cert_file, keyfile, config->tls_context.cipher_list); if (!tls_ctx) { ICECAST_LOG_INFO("No TLS capability on any configured ports"); return; } tls_ok = true; } /* handlers for reading and writing a connection_t when there is TLS * configured on the listening port */ static int connection_read_tls(connection_t *con, void *buf, size_t len) { ssize_t bytes = tls_read(con->tls, buf, len); if (bytes <= 0) { if (tls_want_io(con->tls) > 0) return -1; con->error = 1; } return bytes; } static int connection_send_tls(connection_t *con, const void *buf, size_t len) { ssize_t bytes = tls_write(con->tls, buf, len); if (bytes < 0) { con->error = 1; } else { con->sent_bytes += bytes; } return bytes; } #else /* TLS not compiled in, so at least log it */ static void get_tls_certificate(ice_config_t *config) { tls_ok = false; ICECAST_LOG_INFO("No TLS capability. " "Rebuild Icecast with OpenSSL support to enable this."); } #endif /* ICECAST_CAP_TLS */ /* handlers (default) for reading and writing a connection_t, no encrpytion * used just straight access to the socket */ static int connection_read(connection_t *con, void *buf, size_t len) { int bytes = sock_read_bytes(con->sock, buf, len); if (bytes == 0) con->error = 1; if (bytes == -1 && !sock_recoverable(sock_error())) con->error = 1; return bytes; } static int connection_send(connection_t *con, const void *buf, size_t len) { int bytes = sock_write_bytes(con->sock, buf, len); if (bytes < 0) { if (!sock_recoverable(sock_error())) con->error = 1; } else { con->sent_bytes += bytes; } return bytes; } connection_t *connection_create(sock_t sock, listensocket_t *listensocket_real, listensocket_t* listensocket_effective, char *ip) { connection_t *con; if (!matchfile_match_allow_deny(allowed_ip, banned_ip, ip)) return NULL; con = (connection_t *)calloc(1, sizeof(connection_t)); if (con) { refobject_ref(listensocket_real); refobject_ref(listensocket_effective); con->sock = sock; con->listensocket_real = listensocket_real; con->listensocket_effective = listensocket_effective; con->con_time = time(NULL); con->id = _next_connection_id(); con->ip = ip; con->tlsmode = ICECAST_TLSMODE_AUTO; con->read = connection_read; con->send = connection_send; } fastevent_emit(FASTEVENT_TYPE_CONNECTION_CREATE, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_CONNECTION, con); return con; } /* prepare connection for interacting over a TLS connection */ void connection_uses_tls(connection_t *con) { #ifdef ICECAST_CAP_TLS if (con->tls) return; if (con->readbufferlen) { ICECAST_LOG_ERROR("Connection is now using TLS but has data put back. BAD. Discarding putback data."); free(con->readbuffer); con->readbufferlen = 0; } con->tlsmode = ICECAST_TLSMODE_RFC2818; con->read = connection_read_tls; con->send = connection_send_tls; con->tls = tls_new(tls_ctx); tls_set_incoming(con->tls); tls_set_socket(con->tls, con->sock); #endif } ssize_t connection_send_bytes(connection_t *con, const void *buf, size_t len) { ssize_t ret = con->send(con, buf, len); fastevent_emit(FASTEVENT_TYPE_CONNECTION_WRITE, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_OBRD, con, buf, len, ret); return ret; } static inline ssize_t connection_read_bytes_real(connection_t *con, void *buf, size_t len) { ssize_t done = 0; ssize_t ret; if (con->readbufferlen) { ICECAST_LOG_DEBUG("On connection %p we read from putback buffer, filled with %zu bytes, requested are %zu bytes", con, con->readbufferlen, len); if (len >= con->readbufferlen) { memcpy(buf, con->readbuffer, con->readbufferlen); free(con->readbuffer); con->readbuffer = NULL; ICECAST_LOG_DEBUG("New fill in buffer="); if (len == con->readbufferlen) { con->readbufferlen = 0; return len; } else { len -= con->readbufferlen; buf += con->readbufferlen; done = con->readbufferlen; con->readbufferlen = 0; } } else { memcpy(buf, con->readbuffer, len); memmove(con->readbuffer, con->readbuffer+len, con->readbufferlen-len); con->readbufferlen -= len; return len; } } ret = con->read(con, buf, len); if (ret < 0) { if (done == 0) { return ret; } else { return done; } } return done + ret; } ssize_t connection_read_bytes(connection_t *con, void *buf, size_t len) { ssize_t ret = connection_read_bytes_real(con, buf, len); fastevent_emit(FASTEVENT_TYPE_CONNECTION_READ, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_OBRD, con, buf, len, ret); return ret; } int connection_read_put_back(connection_t *con, const void *buf, size_t len) { void *n; fastevent_emit(FASTEVENT_TYPE_CONNECTION_PUTBACK, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_OBR, con, buf, len); if (con->readbufferlen) { n = realloc(con->readbuffer, con->readbufferlen + len); if (!n) return -1; memcpy(n + con->readbufferlen, buf, len); con->readbuffer = n; con->readbufferlen += len; ICECAST_LOG_DEBUG("On connection %p %zu bytes have been put back.", con, len); return 0; } else { n = malloc(len); if (!n) return -1; memcpy(n, buf, len); con->readbuffer = n; con->readbufferlen = len; ICECAST_LOG_DEBUG("On connection %p %zu bytes have been put back.", con, len); return 0; } } /* add client to connection queue. At this point some header information * has been collected, so we now pass it onto the connection thread for * further processing */ static void _add_connection(client_queue_t *node) { thread_spin_lock(&_connection_lock); *_con_queue_tail = node; _con_queue_tail = (volatile client_queue_t **) &node->next; thread_spin_unlock(&_connection_lock); } /* this returns queued clients for the connection thread. headers are * already provided, but need to be parsed. */ static client_queue_t *_get_connection(void) { client_queue_t *node = NULL; thread_spin_lock(&_connection_lock); if (_con_queue){ node = (client_queue_t *)_con_queue; _con_queue = node->next; if (_con_queue == NULL) _con_queue_tail = &_con_queue; node->next = NULL; } thread_spin_unlock(&_connection_lock); return node; } /* run along queue checking for any data that has come in or a timeout */ static void process_request_queue (void) { client_queue_t **node_ref = (client_queue_t **)&_req_queue; ice_config_t *config; int timeout; char peak; config = config_get_config(); timeout = config->header_timeout; config_release_config(); while (*node_ref) { client_queue_t *node = *node_ref; client_t *client = node->client; int len = PER_CLIENT_REFBUF_SIZE - 1 - node->offset; char *buf = client->refbuf->data + node->offset; ICECAST_LOG_DDEBUG("Checking on client %p", client); if (client->con->tlsmode == ICECAST_TLSMODE_AUTO || client->con->tlsmode == ICECAST_TLSMODE_AUTO_NO_PLAIN) { if (recv(client->con->sock, &peak, 1, MSG_PEEK) == 1) { if (peak == 0x16) { /* TLS Record Protocol Content type 0x16 == Handshake */ connection_uses_tls(client->con); } } } if (len > 0) { if (client->con->con_time + timeout <= time(NULL)) { len = 0; } else { len = client_read_bytes(client, buf, len); } } if (len > 0 || node->shoutcast > 1) { ssize_t stream_offset = -1; int pass_it = 1; char *ptr; if (len < 0 && node->shoutcast > 1) len = 0; /* handle \n, \r\n and nsvcap which for some strange reason has * EOL as \r\r\n */ node->offset += len; client->refbuf->data[node->offset] = '\000'; do { if (node->shoutcast == 1) { /* password line */ if (strstr (client->refbuf->data, "\r\r\n") != NULL) break; if (strstr (client->refbuf->data, "\r\n") != NULL) break; if (strstr (client->refbuf->data, "\n") != NULL) break; } /* stream_offset refers to the start of any data sent after the * http style headers, we don't want to lose those */ ptr = strstr(client->refbuf->data, "\r\r\n\r\r\n"); if (ptr) { stream_offset = (ptr+6) - client->refbuf->data; break; } ptr = strstr(client->refbuf->data, "\r\n\r\n"); if (ptr) { stream_offset = (ptr+4) - client->refbuf->data; break; } ptr = strstr(client->refbuf->data, "\n\n"); if (ptr) { stream_offset = (ptr+2) - client->refbuf->data; break; } pass_it = 0; } while (0); ICECAST_LOG_DDEBUG("pass_it=%i, len=%i", pass_it, (int)len); ICECAST_LOG_DDEBUG("Client %p has buffer: %H", client, client->refbuf->data); if (pass_it) { if (stream_offset != -1) { connection_read_put_back(client->con, client->refbuf->data + stream_offset, node->offset - stream_offset); node->offset = stream_offset; } if ((client_queue_t **)_req_queue_tail == &(node->next)) _req_queue_tail = (volatile client_queue_t **)node_ref; *node_ref = node->next; node->next = NULL; _add_connection(node); continue; } } else { if (len == 0 || client->con->error) { if ((client_queue_t **)_req_queue_tail == &node->next) _req_queue_tail = (volatile client_queue_t **)node_ref; *node_ref = node->next; client_destroy(client); free(node); continue; } } node_ref = &node->next; } _handle_connection(); } /* add client to body queue. */ static void _add_body_client(client_queue_t *node) { ICECAST_LOG_DEBUG("Putting client %p in body queue.", node->client); thread_spin_lock(&_connection_lock); *_body_queue_tail = node; _body_queue_tail = (volatile client_queue_t **) &node->next; thread_spin_unlock(&_connection_lock); } static client_slurp_result_t process_request_body_queue_one(client_queue_t *node, time_t timeout, size_t body_size_limit) { client_t *client = node->client; client_slurp_result_t res; if (client->parser->req_type == httpp_req_post) { if (node->bodybuffer == NULL && client->request_body_read == 0) { if (client->request_body_length < 0) { node->bodybufferlen = body_size_limit; node->bodybuffer = malloc(node->bodybufferlen); } else if (client->request_body_length <= (ssize_t)body_size_limit) { node->bodybufferlen = client->request_body_length; node->bodybuffer = malloc(node->bodybufferlen); } } } if (node->bodybuffer) { res = client_body_slurp(client, node->bodybuffer, &(node->bodybufferlen)); if (res == CLIENT_SLURP_SUCCESS) { httpp_parse_postdata(client->parser, node->bodybuffer, node->bodybufferlen); free(node->bodybuffer); node->bodybuffer = NULL; } } else { res = client_body_skip(client); } if (res != CLIENT_SLURP_SUCCESS) { if (client->con->con_time <= timeout || client->request_body_read >= body_size_limit) { return CLIENT_SLURP_ERROR; } } return res; } /* This queue reads data from the body of clients. */ static void process_request_body_queue (void) { client_queue_t **node_ref = (client_queue_t **)&_body_queue; ice_config_t *config; time_t timeout; size_t body_size_limit; ICECAST_LOG_DDEBUG("Processing body queue."); ICECAST_LOG_DDEBUG("_body_queue=%p, &_body_queue=%p, _body_queue_tail=%p", _body_queue, &_body_queue, _body_queue_tail); config = config_get_config(); timeout = time(NULL) - config->body_timeout; body_size_limit = config->body_size_limit; config_release_config(); while (*node_ref) { client_queue_t *node = *node_ref; client_t *client = node->client; client_slurp_result_t res; node->tried_body = 1; ICECAST_LOG_DEBUG("Got client %p in body queue.", client); res = process_request_body_queue_one(node, timeout, body_size_limit); if (res != CLIENT_SLURP_NEEDS_MORE_DATA) { ICECAST_LOG_DEBUG("Putting client %p back in connection queue.", client); if ((client_queue_t **)_body_queue_tail == &(node->next)) _body_queue_tail = (volatile client_queue_t **)node_ref; *node_ref = node->next; node->next = NULL; _add_connection(node); continue; } node_ref = &node->next; } } /* add node to the queue of requests. This is where the clients are when * initial http details are read. */ static void _add_request_queue(client_queue_t *node) { *_req_queue_tail = node; _req_queue_tail = (volatile client_queue_t **)&node->next; } static client_queue_t *create_client_node(client_t *client) { client_queue_t *node = calloc (1, sizeof (client_queue_t)); const listener_t *listener; if (!node) return NULL; node->client = client; listener = listensocket_get_listener(client->con->listensocket_effective); if (listener) { if (listener->shoutcast_compat) node->shoutcast = 1; client->con->tlsmode = listener->tls; if (listener->tls == ICECAST_TLSMODE_RFC2818 && tls_ok) connection_uses_tls(client->con); if (listener->shoutcast_mount) node->shoutcast_mount = strdup(listener->shoutcast_mount); } listensocket_release_listener(client->con->listensocket_effective); return node; } void connection_queue(connection_t *con) { client_queue_t *node; client_t *client = NULL; global_lock(); if (client_create(&client, con, NULL) < 0) { global_unlock(); client_send_error_by_id(client, ICECAST_ERROR_GEN_CLIENT_LIMIT); /* don't be too eager as this is an imposed hard limit */ thread_sleep(400000); return; } /* setup client for reading incoming http */ client->refbuf->data[PER_CLIENT_REFBUF_SIZE-1] = '\000'; if (sock_set_blocking(client->con->sock, 0) || sock_set_nodelay(client->con->sock)) { global_unlock(); ICECAST_LOG_WARN("Failed to set tcp options on client connection, dropping"); client_destroy(client); return; } node = create_client_node(client); global_unlock(); if (node == NULL) { client_destroy(client); return; } _add_request_queue(node); stats_event_inc(NULL, "connections"); } void connection_accept_loop(void) { connection_t *con; ice_config_t *config; int duration = 300; config = config_get_config(); get_tls_certificate(config); config_release_config(); while (global.running == ICECAST_RUNNING) { con = listensocket_container_accept(global.listensockets, duration); if (con) { connection_queue(con); duration = 5; } else { if (_req_queue == NULL) duration = 300; /* use longer timeouts when nothing waiting */ } process_request_queue(); process_request_body_queue(); } /* Give all the other threads notification to shut down */ thread_cond_broadcast(&global.shutdown_cond); /* wait for all the sources to shutdown */ thread_rwlock_wlock(&_source_shutdown_rwlock); thread_rwlock_unlock(&_source_shutdown_rwlock); } /* Called when activating a source. Verifies that the source count is not * exceeded and applies any initial parameters. */ int connection_complete_source(source_t *source, int response) { ice_config_t *config; global_lock(); ICECAST_LOG_DEBUG("sources count is %d", global.sources); config = config_get_config(); if (global.sources < config->source_limit) { const char *contenttype; mount_proxy *mountinfo; format_type_t format_type; /* setup format handler */ contenttype = httpp_getvar (source->parser, "content-type"); if (contenttype != NULL) { format_type = format_get_type(contenttype); if (format_type == FORMAT_ERROR) { config_release_config(); global_unlock(); if (response) { client_send_error_by_id(source->client, ICECAST_ERROR_CON_CONTENT_TYPE_NOSYS); source->client = NULL; } ICECAST_LOG_WARN("Content-type \"%s\" not supported, dropping source", contenttype); return -1; } } else if (source->parser->req_type == httpp_req_put) { config_release_config(); global_unlock(); if (response) { client_send_error_by_id(source->client, ICECAST_ERROR_CON_NO_CONTENT_TYPE_GIVEN); source->client = NULL; } ICECAST_LOG_ERROR("Content-type not given in PUT request, dropping source"); return -1; } else { ICECAST_LOG_ERROR("No content-type header, falling back to backwards compatibility mode " "for icecast 1.x relays. Assuming content is mp3. This behaviour is deprecated " "and the source client will NOT work with future Icecast versions!"); format_type = FORMAT_TYPE_GENERIC; } if (format_get_plugin (format_type, source) < 0) { global_unlock(); config_release_config(); if (response) { client_send_error_by_id(source->client, ICECAST_ERROR_CON_INTERNAL_FORMAT_ALLOC_ERROR); source->client = NULL; } ICECAST_LOG_WARN("plugin format failed for \"%s\"", source->mount); return -1; } global.sources++; stats_event_args(NULL, "sources", "%d", global.sources); global_unlock(); source->running = 1; mountinfo = config_find_mount(config, source->mount, MOUNT_TYPE_NORMAL); source_update_settings(config, source, mountinfo); config_release_config(); slave_rebuild_mounts(); source->shutdown_rwlock = &_source_shutdown_rwlock; ICECAST_LOG_DEBUG("source is ready to start"); return 0; } ICECAST_LOG_WARN("Request to add source when maximum source limit " "reached %d", global.sources); global_unlock(); config_release_config(); if (response) { client_send_error_by_id(source->client, ICECAST_ERROR_CON_SOURCE_CLIENT_LIMIT); source->client = NULL; } return -1; } static inline void source_startup(client_t *client) { source_t *source; source = source_reserve(client->uri); if (source) { source->client = client; source->parser = client->parser; source->con = client->con; if (connection_complete_source(source, 1) < 0) { source_clear_source(source); source_free_source(source); return; } client->respcode = 200; if (client->protocol == ICECAST_PROTOCOL_SHOUTCAST) { client->respcode = 200; /* send this non-blocking but if there is only a partial write * then leave to header timeout */ client_send_bytes(client, "OK2\r\nicy-caps:11\r\n\r\n", 20); /* TODO: Replace Magic Number! */ source->shoutcast_compat = 1; source_client_callback(client, source); } else { refbuf_t *ok = refbuf_new(PER_CLIENT_REFBUF_SIZE); const char *expectcontinue; const char *transfer_encoding; int status_to_send = 0; ssize_t ret; transfer_encoding = httpp_getvar(source->parser, "transfer-encoding"); if (transfer_encoding && strcasecmp(transfer_encoding, HTTPP_ENCODING_IDENTITY) != 0) { client->encoding = httpp_encoding_new(transfer_encoding); if (!client->encoding) { client_send_error_by_id(client, ICECAST_ERROR_CON_UNIMPLEMENTED); return; } } if (source->parser && source->parser->req_type == httpp_req_source) { status_to_send = 200; } else { /* For PUT support we check for 100-continue and send back a 100 to stay in spec */ expectcontinue = httpp_getvar (source->parser, "expect"); if (expectcontinue != NULL) { #ifdef HAVE_STRCASESTR if (strcasestr (expectcontinue, "100-continue") != NULL) #else ICECAST_LOG_WARN("OS doesn't support case insensitive substring checks..."); if (strstr (expectcontinue, "100-continue") != NULL) #endif { status_to_send = 100; } } } client->respcode = 200; if (status_to_send) { ret = util_http_build_header(ok->data, PER_CLIENT_REFBUF_SIZE, 0, 0, status_to_send, NULL, NULL, NULL, NULL, NULL, client); snprintf(ok->data + ret, PER_CLIENT_REFBUF_SIZE - ret, "Content-Length: 0\r\n\r\n"); ok->len = strlen(ok->data); } else { ok->len = 0; } refbuf_release(client->refbuf); client->refbuf = ok; fserve_add_client_callback(client, source_client_callback, source); } } else { client_send_error_by_id(client, ICECAST_ERROR_CON_MOUNT_IN_USE); ICECAST_LOG_WARN("Mountpoint %s in use", client->uri); } } /* only called for native icecast source clients */ static void _handle_source_request(client_t *client) { const char *method = httpp_getvar(client->parser, HTTPP_VAR_REQ_TYPE); ICECAST_LOG_INFO("Source logging in at mountpoint \"%s\" using %s%H%s from %s as role %s with acl %s", client->uri, ((method) ? "\"" : "<"), ((method) ? method : "unknown"), ((method) ? "\"" : ">"), client->con->ip, client->role, acl_get_name(client->acl)); if (client->parser && client->parser->req_type == httpp_req_source) { ICECAST_LOG_DEBUG("Source at mountpoint \"%s\" connected using deprecated SOURCE method.", client->uri); } if (client->uri[0] != '/') { ICECAST_LOG_WARN("source mountpoint not starting with /"); client_send_error_by_id(client, ICECAST_ERROR_CON_MOUNTPOINT_NOT_STARTING_WITH_SLASH); return; } source_startup(client); } static void _handle_stats_request(client_t *client) { stats_event_inc(NULL, "stats_connections"); client->respcode = 200; snprintf (client->refbuf->data, PER_CLIENT_REFBUF_SIZE, "HTTP/1.0 200 OK\r\n\r\n"); client->refbuf->len = strlen(client->refbuf->data); fserve_add_client_callback(client, stats_callback, NULL); } /* if 0 is returned then the client should not be touched, however if -1 * is returned then the caller is responsible for handling the client */ static void __add_listener_to_source(source_t *source, client_t *client) { size_t loop = 10; do { ICECAST_LOG_DEBUG("max on %s is %ld (cur %lu)", source->mount, source->max_listeners, source->listeners); if (source->max_listeners == -1) break; if (source->listeners < (unsigned long)source->max_listeners) break; if (loop && source->fallback_when_full && source->fallback_mount) { source_t *next = source_find_mount (source->fallback_mount); if (!next) { ICECAST_LOG_ERROR("Fallback '%s' for full source '%s' not found", source->mount, source->fallback_mount); client_send_error_by_id(client, ICECAST_ERROR_SOURCE_MAX_LISTENERS); return; } ICECAST_LOG_INFO("stream full, trying %s", next->mount); source = next; navigation_history_navigate_to(&(client->history), source->identifier, NAVIGATION_DIRECTION_DOWN); loop--; continue; } /* now we fail the client */ client_send_error_by_id(client, ICECAST_ERROR_SOURCE_MAX_LISTENERS); return; } while (1); client->write_to_client = format_generic_write_to_client; client->check_buffer = format_check_http_buffer; client->refbuf->len = PER_CLIENT_REFBUF_SIZE; memset(client->refbuf->data, 0, PER_CLIENT_REFBUF_SIZE); /* lets add the client to the active list */ avl_tree_wlock(source->pending_tree); avl_insert(source->pending_tree, client); avl_tree_unlock(source->pending_tree); if (source->running == 0 && source->on_demand) { /* enable on-demand relay to start, wake up the slave thread */ ICECAST_LOG_DEBUG("kicking off on-demand relay"); source->on_demand_req = 1; } ICECAST_LOG_DEBUG("Added client to %s", source->mount); } /* count the number of clients on a mount with same username and same role as the given one */ static inline ssize_t __count_user_role_on_mount (source_t *source, client_t *client) { ssize_t ret = 0; avl_node *node; avl_tree_rlock(source->client_tree); node = avl_get_first(source->client_tree); while (node) { client_t *existing_client = (client_t *)node->key; if (existing_client->username && client->username && strcmp(existing_client->username, client->username) == 0 && existing_client->role && client->role && strcmp(existing_client->role, client->role) == 0) { ret++; } node = avl_get_next(node); } avl_tree_unlock(source->client_tree); avl_tree_rlock(source->pending_tree); node = avl_get_first(source->pending_tree); while (node) { client_t *existing_client = (client_t *)node->key; if (existing_client->username && client->username && strcmp(existing_client->username, client->username) == 0 && existing_client->role && client->role && strcmp(existing_client->role, client->role) == 0){ ret++; } node = avl_get_next(node); } avl_tree_unlock(source->pending_tree); return ret; } static void _handle_get_request(client_t *client) { source_t *source = NULL; ICECAST_LOG_DEBUG("Got client %p with URI %H", client, client->uri); /* there are several types of HTTP GET clients * media clients, which are looking for a source (eg, URI = /stream.ogg), * stats clients, which are looking for /admin/stats.xml and * fserve clients, which are looking for static files. */ stats_event_inc(NULL, "client_connections"); /* this is a web/ request. let's check if we are allowed to do that. */ if (acl_test_web(client->acl) != ACL_POLICY_ALLOW) { /* doesn't seem so, sad client :( */ auth_reject_client_on_deny(client); return; } if (client->parser->req_type == httpp_req_options) { client_send_204(client); return; } if (util_check_valid_extension(client->uri) == XSLT_CONTENT) { /* If the file exists, then transform it, otherwise, write a 404 */ ICECAST_LOG_DEBUG("Stats request, sending XSL transformed stats"); stats_transform_xslt(client); return; } avl_tree_rlock(global.source_tree); /* let's see if this is a source or just a random fserve file */ source = source_find_mount_with_history(client->uri, &(client->history)); if (source) { /* true mount */ do { ssize_t max_connections_per_user = acl_get_max_connections_per_user(client->acl); /* check for duplicate_logins */ if (max_connections_per_user > 0) { /* -1 = not set (-> default=unlimited), 0 = unlimited */ if (max_connections_per_user <= __count_user_role_on_mount(source, client)) { client_send_error_by_id(client, ICECAST_ERROR_CON_PER_CRED_CLIENT_LIMIT); break; } } if (!source->allow_direct_access) { client_send_error_by_id(client, ICECAST_ERROR_CON_MOUNT_NO_FOR_DIRECT_ACCESS); break; } /* Set max listening duration in case not already set. */ if (client->con->discon_time == 0) { time_t connection_duration = acl_get_max_connection_duration(client->acl); if (connection_duration == -1) { ice_config_t *config = config_get_config(); mount_proxy *mount = config_find_mount(config, source->mount, MOUNT_TYPE_NORMAL); if (mount && mount->max_listener_duration) connection_duration = mount->max_listener_duration; config_release_config(); } if (connection_duration > 0) /* -1 = not set (-> default=unlimited), 0 = unlimited */ client->con->discon_time = connection_duration + time(NULL); } __add_listener_to_source(source, client); } while (0); avl_tree_unlock(global.source_tree); } else { /* file */ avl_tree_unlock(global.source_tree); fserve_client_create(client); } } static void _handle_delete_request(client_t *client) { source_t *source; avl_tree_wlock(global.source_tree); source = source_find_mount_raw(client->uri); if (source) { source->running = 0; avl_tree_unlock(global.source_tree); client_send_204(client); } else { avl_tree_unlock(global.source_tree); client_send_error_by_id(client, ICECAST_ERROR_CON_UNKNOWN_REQUEST); } } static void _handle_shoutcast_compatible(client_queue_t *node) { char *http_compliant; int http_compliant_len = 0; http_parser_t *parser; const char *shoutcast_mount; client_t *client = node->client; ice_config_t *config; ICECAST_LOG_DDEBUG("Client %p is a shoutcast client of stage %i", client, (int)node->shoutcast); if (node->shoutcast == 1) { char *ptr, *headers; ICECAST_LOG_DDEBUG("Client %p has buffer: %H", client, client->refbuf->data); /* Get rid of trailing \r\n or \n after password */ ptr = strstr(client->refbuf->data, "\r\r\n"); if (ptr) { headers = ptr+3; } else { ptr = strstr(client->refbuf->data, "\r\n"); if (ptr) { headers = ptr+2; } else { ptr = strstr(client->refbuf->data, "\n"); if (ptr) headers = ptr+1; } } if (ptr == NULL){ client_destroy(client); free(node->shoutcast_mount); free(node); return; } *ptr = '\0'; client->password = strdup(client->refbuf->data); config = config_get_config(); client->username = strdup(config->shoutcast_user); config_release_config(); node->offset -= (headers - client->refbuf->data); memmove(client->refbuf->data, headers, node->offset+1); node->shoutcast = 2; /* we've checked the password, now send it back for reading headers */ _add_request_queue(node); ICECAST_LOG_DDEBUG("Client %p re-added to request queue", client); return; } /* actually make a copy as we are dropping the config lock */ /* Here we create a valid HTTP request based of the information that was passed in via the non-HTTP style protocol above. This means we can use some of our existing code to handle this case */ config = config_get_config(); if (node->shoutcast_mount) { shoutcast_mount = node->shoutcast_mount; } else { shoutcast_mount = config->shoutcast_mount; } http_compliant_len = 20 + strlen(shoutcast_mount) + node->offset; http_compliant = (char *)calloc(1, http_compliant_len); snprintf(http_compliant, http_compliant_len, "SOURCE %s HTTP/1.0\r\n%s", shoutcast_mount, client->refbuf->data); config_release_config(); parser = httpp_create_parser(); httpp_initialize(parser, NULL); if (httpp_parse(parser, http_compliant, strlen(http_compliant))) { client->refbuf->len = 0; client->parser = parser; client->protocol = ICECAST_PROTOCOL_SHOUTCAST; node->shoutcast = 0; return; } else { httpp_destroy(parser); client_destroy(client); } free(http_compliant); free(node->shoutcast_mount); free(node); return; } /* Handle lookups here. */ static int _handle_resources(client_t *client, char **uri) { const char *http_host = httpp_getvar(client->parser, "host"); char *serverhost = NULL; int serverport = 0; char *vhost = NULL; char *vhost_colon; char *new_uri = NULL; ice_config_t *config; const listener_t *listen_sock; resource_t *resource; if (http_host) { vhost = strdup(http_host); if (vhost) { vhost_colon = strstr(vhost, ":"); if (vhost_colon) *vhost_colon = 0; } } config = config_get_config(); listen_sock = listensocket_get_listener(client->con->listensocket_effective); if (listen_sock) { serverhost = listen_sock->bind_address; serverport = listen_sock->port; } resource = config->resources; /* We now go thru all resources and see if any matches. */ for (; resource; resource = resource->next) { /* We check for several aspects, if they DO NOT match, we continue with our search. */ /* Check for the URI to match. */ if (resource->flags & ALIAS_FLAG_PREFIXMATCH) { size_t len = strlen(resource->source); if (strncmp(*uri, resource->source, len) != 0) continue; ICECAST_LOG_DEBUG("Match: *uri='%s', resource->source='%s', len=%zu", *uri, resource->source, len); } else { if (strcmp(*uri, resource->source) != 0) continue; } /* Check for the server's port to match. */ if (resource->port != -1 && resource->port != serverport) continue; /* Check for the server's bind address to match. */ if (resource->bind_address != NULL && serverhost != NULL && strcmp(resource->bind_address, serverhost) != 0) continue; if (resource->listen_socket != NULL && (listen_sock->id == NULL || strcmp(resource->listen_socket, listen_sock->id) != 0)) continue; /* Check for the vhost to match. */ if (resource->vhost != NULL && vhost != NULL && strcmp(resource->vhost, vhost) != 0) continue; /* Ok, we found a matching entry. */ if (resource->destination) { if (resource->flags & ALIAS_FLAG_PREFIXMATCH) { size_t len = strlen(resource->source); asprintf(&new_uri, "%s%s", resource->destination, (*uri) + len); } else { new_uri = strdup(resource->destination); } } if (resource->omode != OMODE_DEFAULT) client->mode = resource->omode; if (resource->module) { module_t *module = module_container_get_module(global.modulecontainer, resource->module); if (module != NULL) { refobject_unref(client->handler_module); client->handler_module = module; } else { ICECAST_LOG_ERROR("Module used in alias not found: %s", resource->module); } } if (resource->handler) { char *func = strdup(resource->handler); if (func) { free(client->handler_function); client->handler_function = func; } else { ICECAST_LOG_ERROR("Can not allocate memory."); } } ICECAST_LOG_DEBUG("resource has made %s into %s", *uri, new_uri); break; } listensocket_release_listener(client->con->listensocket_effective); config_release_config(); if (new_uri) { free(*uri); *uri = new_uri; } if (vhost) free(vhost); return 0; } static void _handle_admin_request(client_t *client, char *adminuri) { ICECAST_LOG_DEBUG("Client %p requesting admin interface.", client); stats_event_inc(NULL, "client_connections"); admin_handle_request(client, adminuri); } /* Handle any client that passed the authing process. */ static void _handle_authed_client(client_t *client, void *userdata, auth_result result) { auth_stack_release(client->authstack); client->authstack = NULL; /* Update admin parameters just in case auth changed our URI */ if (_update_admin_command(client) == -1) return; fastevent_emit(FASTEVENT_TYPE_CLIENT_AUTHED, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_CLIENT, client); if (result != AUTH_OK) { auth_reject_client_on_fail(client); return; } if (acl_test_method(client->acl, client->parser->req_type) != ACL_POLICY_ALLOW) { ICECAST_LOG_ERROR("Client (role=%s, acl=%s, username=%s) not allowed to use this request method on %H", client->role, acl_get_name(client->acl), client->username, client->uri); auth_reject_client_on_deny(client); return; } /* Dispatch legacy admin.cgi requests */ if (strcmp(client->uri, "/admin.cgi") == 0) { _handle_admin_request(client, client->uri + 1); return; } /* Dispatch all admin requests */ else if (strncmp(client->uri, "/admin/", 7) == 0) { _handle_admin_request(client, client->uri + 7); return; } if (client->handler_module && client->handler_function) { const module_client_handler_t *handler = module_get_client_handler(client->handler_module, client->handler_function); if (handler) { handler->cb(client->handler_module, client); return; } else { ICECAST_LOG_ERROR("No such handler function in module: %s", client->handler_function); } } switch (client->parser->req_type) { case httpp_req_source: case httpp_req_put: _handle_source_request(client); break; case httpp_req_stats: _handle_stats_request(client); break; case httpp_req_get: case httpp_req_post: case httpp_req_options: _handle_get_request(client); break; case httpp_req_delete: _handle_delete_request(client); break; default: ICECAST_LOG_ERROR("Wrong request type from client"); client_send_error_by_id(client, ICECAST_ERROR_CON_UNKNOWN_REQUEST); break; } } /* Handle clients that still need to authenticate. */ static void _handle_authentication_global(client_t *client, void *userdata, auth_result result) { ice_config_t *config; auth_stack_t *authstack; auth_stack_release(client->authstack); client->authstack = NULL; if (result != AUTH_NOMATCH && /* Allow global admins access to all mount points */ !(result == AUTH_OK && client->admin_command != ADMIN_COMMAND_ERROR && acl_test_admin(client->acl, client->admin_command) == ACL_POLICY_DENY)) { _handle_authed_client(client, userdata, result); return; } ICECAST_LOG_DEBUG("Trying global authenticators for client %p.", client); config = config_get_config(); authstack = config->authstack; auth_stack_addref(authstack); config_release_config(); auth_stack_add_client(authstack, client, _handle_authed_client, userdata); auth_stack_release(authstack); } static inline mount_proxy * __find_non_admin_mount(ice_config_t *config, const char *name, mount_type type) { if (strcmp(name, "/admin.cgi") == 0 || strncmp(name, "/admin/", 7) == 0) return NULL; return config_find_mount(config, name, type); } static void _handle_authentication_mount_generic(client_t *client, void *userdata, mount_type type, void (*callback)(client_t*, void*, auth_result)) { ice_config_t *config; mount_proxy *mountproxy; auth_stack_t *stack = NULL; config = config_get_config(); mountproxy = __find_non_admin_mount(config, client->uri, type); if (!mountproxy) { int command_type = admin_get_command_type(client->admin_command); if (command_type == ADMINTYPE_MOUNT || command_type == ADMINTYPE_HYBRID) { const char *mount = httpp_get_param(client->parser, "mount"); if (mount) mountproxy = __find_non_admin_mount(config, mount, type); } } if (mountproxy && mountproxy->mounttype == type) stack = mountproxy->authstack; auth_stack_addref(stack); config_release_config(); if (stack) { auth_stack_add_client(stack, client, callback, userdata); auth_stack_release(stack); } else { callback(client, userdata, AUTH_NOMATCH); } } static void _handle_authentication_mount_default(client_t *client, void *userdata, auth_result result) { auth_stack_release(client->authstack); client->authstack = NULL; if (result != AUTH_NOMATCH && /* Allow global admins access to all mount points */ !(result == AUTH_OK && client->admin_command != ADMIN_COMMAND_ERROR && acl_test_admin(client->acl, client->admin_command) == ACL_POLICY_DENY)) { _handle_authed_client(client, userdata, result); return; } ICECAST_LOG_DEBUG("Trying specific authenticators for client %p.", client); _handle_authentication_mount_generic(client, userdata, MOUNT_TYPE_DEFAULT, _handle_authentication_global); } static void _handle_authentication_mount_normal(client_t *client, void *userdata, auth_result result) { auth_stack_release(client->authstack); client->authstack = NULL; if (result != AUTH_NOMATCH) { _handle_authed_client(client, userdata, result); return; } ICECAST_LOG_DEBUG("Trying specific authenticators for client %p.", client); _handle_authentication_mount_generic(client, userdata, MOUNT_TYPE_NORMAL, _handle_authentication_mount_default); } static void _handle_authentication_listen_socket(client_t *client) { auth_stack_t *stack = NULL; const listener_t *listener; listener = listensocket_get_listener(client->con->listensocket_effective); if (listener) { if (listener->authstack) { auth_stack_addref(stack = listener->authstack); } listensocket_release_listener(client->con->listensocket_effective); } if (stack) { auth_stack_add_client(stack, client, _handle_authentication_mount_normal, NULL); auth_stack_release(stack); } else { _handle_authentication_mount_normal(client, NULL, AUTH_NOMATCH); } } static void _handle_authentication(client_t *client) { fastevent_emit(FASTEVENT_TYPE_CLIENT_READY_FOR_AUTH, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_CLIENT, client); _handle_authentication_listen_socket(client); } static void __prepare_shoutcast_admin_cgi_request(client_t *client) { ice_config_t *config; const char *sc_mount; const char *pass = httpp_get_query_param(client->parser, "pass"); const listener_t *listener; if (pass == NULL) { ICECAST_LOG_ERROR("missing pass parameter"); return; } if (client->password) { ICECAST_LOG_INFO("Client already has password set"); return; } /* Why do we acquire a global lock here? -- ph3-der-loewe, 2018-05-11 */ global_lock(); config = config_get_config(); sc_mount = config->shoutcast_mount; listener = listensocket_get_listener(client->con->listensocket_effective); if (listener && listener->shoutcast_mount) sc_mount = listener->shoutcast_mount; httpp_set_query_param(client->parser, "mount", sc_mount); listensocket_release_listener(client->con->listensocket_effective); httpp_setvar(client->parser, HTTPP_VAR_PROTOCOL, "ICY"); client->password = strdup(pass); config_release_config(); global_unlock(); } /* Check if we need body of client */ static int _need_body(client_queue_t *node) { client_t *client = node->client; if (node->tried_body) return 0; if (client->parser->req_type == httpp_req_source) { /* SOURCE connection. */ return 0; } else if (client->parser->req_type == httpp_req_put) { /* PUT connection. * TODO: We may need body for /admin/ but we do not know if it's an admin request yet. */ return 0; } else if (client->request_body_length != -1 && (size_t)client->request_body_length != client->request_body_read) { return 1; } else if (client->request_body_length == -1 && client_body_eof(client) == 0) { return 1; } return 0; } /* Updates client's admin_command */ static int _update_admin_command(client_t *client) { if (strcmp(client->uri, "/admin.cgi") == 0) { client->admin_command = admin_get_command(client->uri + 1); __prepare_shoutcast_admin_cgi_request(client); if (!client->password) { client_send_error_by_id(client, ICECAST_ERROR_CON_MISSING_PASS_PARAMETER); return -1; } } else if (strncmp(client->uri, "/admin/", 7) == 0) { client->admin_command = admin_get_command(client->uri + 7); } return 0; } /* Connection thread. Here we take clients off the connection queue and check * the contents provided. We set up the parser then hand off to the specific * request handler. */ static void _handle_connection(void) { http_parser_t *parser; const char *rawuri; client_queue_t *node; while (1) { node = _get_connection(); if (node) { client_t *client = node->client; int already_parsed = 0; /* Check for special shoutcast compatability processing */ if (node->shoutcast) { _handle_shoutcast_compatible (node); if (node->shoutcast) continue; } /* process normal HTTP headers */ if (client->parser) { already_parsed = 1; parser = client->parser; } else { parser = httpp_create_parser(); httpp_initialize(parser, NULL); client->parser = parser; } if (already_parsed || httpp_parse (parser, client->refbuf->data, node->offset)) { char *uri; const char *upgrade, *connection; client->refbuf->len = 0; /* early check if we need more data */ client_complete(client); if (_need_body(node)) { /* Just calling _add_body_client() would do the job. * However, if the client only has a small body this might work without moving it between queues. * -> much faster. */ client_slurp_result_t res; ice_config_t *config; time_t timeout; size_t body_size_limit; config = config_get_config(); timeout = time(NULL) - config->body_timeout; body_size_limit = config->body_size_limit; config_release_config(); res = process_request_body_queue_one(node, timeout, body_size_limit); if (res != CLIENT_SLURP_SUCCESS) { _add_body_client(node); continue; } else { ICECAST_LOG_DEBUG("Success on fast lane"); } } rawuri = httpp_getvar(parser, HTTPP_VAR_URI); /* assign a port-based shoutcast mountpoint if required */ if (node->shoutcast_mount && strcmp (rawuri, "/admin.cgi") == 0) httpp_set_query_param (client->parser, "mount", node->shoutcast_mount); free (node->bodybuffer); free (node->shoutcast_mount); free (node); if (strcmp("ICE", httpp_getvar(parser, HTTPP_VAR_PROTOCOL)) && strcmp("HTTP", httpp_getvar(parser, HTTPP_VAR_PROTOCOL))) { ICECAST_LOG_ERROR("Bad HTTP protocol detected"); client_destroy (client); continue; } upgrade = httpp_getvar(parser, "upgrade"); connection = httpp_getvar(parser, "connection"); if (upgrade && connection && strcasecmp(connection, "upgrade") == 0) { if (client->con->tlsmode == ICECAST_TLSMODE_DISABLED || client->con->tls || strstr(upgrade, "TLS/1.0") == NULL) { client_send_error_by_id(client, ICECAST_ERROR_CON_UPGRADE_ERROR); continue; } else { client_send_101(client, ICECAST_REUSE_UPGRADETLS); continue; } } else if (client->con->tlsmode != ICECAST_TLSMODE_DISABLED && client->con->tlsmode != ICECAST_TLSMODE_AUTO && !client->con->tls) { client_send_426(client, ICECAST_REUSE_UPGRADETLS); continue; } if (parser->req_type == httpp_req_options && strcmp(rawuri, "*") == 0) { client->uri = strdup("*"); client_send_204(client); continue; } uri = util_normalise_uri(rawuri); if (!uri) { client_destroy (client); continue; } client->mode = config_str_to_omode(NULL, NULL, httpp_get_param(client->parser, "omode")); if (_handle_resources(client, &uri) != 0) { client_destroy (client); continue; } client->uri = uri; if (_update_admin_command(client) == -1) continue; _handle_authentication(client); } else { free (node); ICECAST_LOG_ERROR("HTTP request parsing failed"); client_destroy (client); } continue; } break; } } static void __on_sock_count(size_t count, void *userdata) { (void)userdata; ICECAST_LOG_DEBUG("Listen socket count is now %zu.", count); if (count == 0 && global.running == ICECAST_RUNNING) { ICECAST_LOG_INFO("No more listen sockets. Exiting."); global.running = ICECAST_HALTING; } } /* called when listening thread is not checking for incoming connections */ void connection_setup_sockets (ice_config_t *config) { global_lock(); refobject_unref(global.listensockets); if (config == NULL) { global_unlock(); return; } /* setup the banned/allowed IP filenames from the xml */ if (config->banfile) { matchfile_release(banned_ip); banned_ip = matchfile_new(config->banfile); if (!banned_ip) ICECAST_LOG_ERROR("Can not create ban object, bad!"); } if (config->allowfile) { matchfile_release(allowed_ip); allowed_ip = matchfile_new(config->allowfile); } global.listensockets = refobject_new(listensocket_container_t); listensocket_container_configure(global.listensockets, config); global_unlock(); listensocket_container_set_sockcount_cb(global.listensockets, __on_sock_count, NULL); listensocket_container_setup(global.listensockets);; } void connection_close(connection_t *con) { if (!con) return; ICECAST_LOG_DEBUG("Closing connection %p (connection ID: %llu, sock=%R)", con, (long long unsigned int)con->id, con->sock); fastevent_emit(FASTEVENT_TYPE_CONNECTION_DESTROY, FASTEVENT_FLAG_MODIFICATION_ALLOWED, FASTEVENT_DATATYPE_CONNECTION, con); tls_unref(con->tls); if (con->sock != SOCK_ERROR) sock_close(con->sock); if (con->ip) free(con->ip); if (con->readbuffer) free(con->readbuffer); refobject_unref(con->listensocket_real); refobject_unref(con->listensocket_effective); free(con); } void connection_queue_client(client_t *client) { client_queue_t *node = create_client_node(client); _add_connection(node); }