| /* $Id$ */ |
| /* |
| * Copyright (C) 2003-2007 Benny Prijono <benny@prijono.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include "turn.h" |
| |
| #define THIS_FILE "allocation.c" |
| |
| |
| enum { |
| TIMER_ID_NONE, |
| TIMER_ID_TIMEOUT, |
| TIMER_ID_DESTROY |
| }; |
| |
| #define DESTROY_DELAY {0, 500} |
| #define PEER_TABLE_SIZE 32 |
| |
| /* ChannelData header */ |
| typedef struct channel_data_hdr |
| { |
| pj_uint16_t ch_number; |
| pj_uint16_t length; |
| } channel_data_hdr; |
| |
| |
| /* Prototypes */ |
| static pj_status_t create_relay(pjturn_allocation *alloc, |
| const pjturn_allocation_req *req); |
| static void on_rx_from_peer(pj_ioqueue_key_t *key, |
| pj_ioqueue_op_key_t *op_key, |
| pj_ssize_t bytes_read); |
| static void destroy_relay(pjturn_relay_res *relay); |
| static pj_status_t stun_on_send_msg(pj_stun_session *sess, |
| const void *pkt, |
| pj_size_t pkt_size, |
| const pj_sockaddr_t *dst_addr, |
| unsigned addr_len); |
| static pj_status_t stun_on_rx_request(pj_stun_session *sess, |
| const pj_uint8_t *pkt, |
| unsigned pkt_len, |
| const pj_stun_msg *msg, |
| const pj_sockaddr_t *src_addr, |
| unsigned src_addr_len); |
| static pj_status_t stun_on_rx_indication(pj_stun_session *sess, |
| const pj_uint8_t *pkt, |
| unsigned pkt_len, |
| const pj_stun_msg *msg, |
| const pj_sockaddr_t *src_addr, |
| unsigned src_addr_len); |
| |
| /* Log allocation error */ |
| static void alloc_err(pjturn_allocation *alloc, const char *title, |
| pj_status_t status) |
| { |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| |
| pj_strerror(status, errmsg, sizeof(errmsg)); |
| PJ_LOG(4,(alloc->obj_name, "%s for client %s: %s", |
| title, alloc->info, errmsg)); |
| } |
| |
| /* |
| * Create new allocation. |
| */ |
| PJ_DEF(pj_status_t) pjturn_allocation_create(pjturn_listener *listener, |
| const pj_sockaddr_t *src_addr, |
| unsigned src_addr_len, |
| const pj_stun_msg *msg, |
| const pjturn_allocation_req *req, |
| pjturn_allocation **p_alloc) |
| { |
| pjturn_srv *srv = listener->server; |
| pj_pool_t *pool; |
| pjturn_allocation *alloc; |
| pj_stun_session_cb sess_cb; |
| char relay_info[80]; |
| pj_status_t status; |
| |
| pool = pj_pool_create(srv->core.pf, "alloc%p", 1000, 1000, NULL); |
| |
| /* Init allocation structure */ |
| alloc = PJ_POOL_ZALLOC_T(pool, pjturn_allocation); |
| alloc->pool = pool; |
| alloc->obj_name = pool->obj_name; |
| alloc->listener = listener; |
| alloc->clt_sock = PJ_INVALID_SOCKET; |
| alloc->relay.tp.sock = PJ_INVALID_SOCKET; |
| |
| alloc->bandwidth = req->bandwidth; |
| |
| alloc->hkey.tp_type = listener->tp_type; |
| pj_memcpy(&alloc->hkey.clt_addr, src_addr, src_addr_len); |
| |
| status = pj_lock_create_recursive_mutex(pool, alloc->obj_name, |
| &alloc->lock); |
| if (status != PJ_SUCCESS) { |
| pjturn_allocation_destroy(alloc); |
| return status; |
| } |
| |
| /* Create peer hash table */ |
| alloc->peer_table = pj_hash_create(pool, PEER_TABLE_SIZE); |
| |
| /* Create channel hash table */ |
| alloc->ch_table = pj_hash_create(pool, PEER_TABLE_SIZE); |
| |
| /* Print info */ |
| pj_ansi_strcpy(alloc->info, pjturn_tp_type_name(listener->tp_type)); |
| alloc->info[3] = ':'; |
| pj_sockaddr_print(src_addr, alloc->info+4, sizeof(alloc->info)-4, 3); |
| |
| /* Create STUN session to handle STUN communication with client */ |
| pj_bzero(&sess_cb, sizeof(sess_cb)); |
| sess_cb.on_send_msg = &stun_on_send_msg; |
| sess_cb.on_rx_request = &stun_on_rx_request; |
| sess_cb.on_rx_indication = &stun_on_rx_indication; |
| status = pj_stun_session_create(&srv->core.stun_cfg, alloc->obj_name, |
| &sess_cb, PJ_FALSE, &alloc->sess); |
| if (status != PJ_SUCCESS) { |
| pjturn_allocation_destroy(alloc); |
| return status; |
| } |
| |
| /* Attach to STUN session */ |
| pj_stun_session_set_user_data(alloc->sess, alloc); |
| |
| /* Create the relay resource */ |
| status = pjturn_allocation_create_relay(srv, alloc, msg, req, |
| &alloc->relay); |
| if (status != PJ_SUCCESS) { |
| pjturn_allocation_destroy(alloc); |
| return status; |
| } |
| |
| /* Register this allocation */ |
| pjturn_srv_register_allocation(srv, alloc); |
| |
| pj_sockaddr_print(&alloc->relay.hkey.addr, relay_info, |
| sizeof(relay_info), 3); |
| PJ_LOG(4,(alloc->obj_name, "Client %s created, relay addr=%s:%s", |
| alloc->info, pjturn_tp_type_name(req->tp_type), relay_info)); |
| |
| /* Success */ |
| *p_alloc = alloc; |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* |
| * Destroy allocation. |
| */ |
| PJ_DECL(void) pjturn_allocation_destroy(pjturn_allocation *alloc) |
| { |
| pj_pool_t *pool; |
| |
| /* Unregister this allocation */ |
| pjturn_srv_unregister_allocation(alloc->listener->server, alloc); |
| |
| /* Destroy relay */ |
| destroy_relay(&alloc->relay); |
| |
| /* Must lock only after destroying relay otherwise deadlock */ |
| if (alloc->lock) { |
| pj_lock_acquire(alloc->lock); |
| } |
| |
| /* Destroy STUN session */ |
| if (alloc->sess) { |
| pj_stun_session_destroy(alloc->sess); |
| alloc->sess = NULL; |
| } |
| |
| /* Destroy lock */ |
| if (alloc->lock) { |
| pj_lock_release(alloc->lock); |
| pj_lock_destroy(alloc->lock); |
| alloc->lock = NULL; |
| } |
| |
| /* Destroy pool */ |
| pool = alloc->pool; |
| if (pool) { |
| alloc->pool = NULL; |
| pj_pool_release(pool); |
| } |
| } |
| |
| |
| /* Destroy relay resource */ |
| static void destroy_relay(pjturn_relay_res *relay) |
| { |
| if (relay->timer.id) { |
| pj_timer_heap_cancel(relay->allocation->listener->server->core.timer_heap, |
| &relay->timer); |
| relay->timer.id = PJ_FALSE; |
| } |
| |
| if (relay->tp.key) { |
| pj_ioqueue_unregister(relay->tp.key); |
| relay->tp.key = NULL; |
| relay->tp.sock = PJ_INVALID_SOCKET; |
| } else if (relay->tp.sock != PJ_INVALID_SOCKET) { |
| pj_sock_close(relay->tp.sock); |
| relay->tp.sock = PJ_INVALID_SOCKET; |
| } |
| |
| /* Mark as shutdown */ |
| relay->lifetime = 0; |
| } |
| |
| /* Initiate shutdown sequence for this allocation */ |
| static void alloc_shutdown(pjturn_allocation *alloc) |
| { |
| pj_time_val destroy_delay = DESTROY_DELAY; |
| |
| /* Work with existing schedule */ |
| if (alloc->relay.timer.id == TIMER_ID_TIMEOUT) { |
| /* Cancel existing timer */ |
| pj_timer_heap_cancel(alloc->listener->server->core.timer_heap, |
| &alloc->relay.timer); |
| alloc->relay.timer.id = TIMER_ID_NONE; |
| |
| } else if (alloc->relay.timer.id == TIMER_ID_DESTROY) { |
| /* We've been scheduled to be destroyed, ignore this |
| * shutdown request. |
| */ |
| return; |
| } |
| |
| pj_assert(alloc->relay.timer.id == TIMER_ID_NONE); |
| |
| /* Shutdown relay socket */ |
| destroy_relay(&alloc->relay); |
| |
| /* Don't unregister from hash table because we still need to |
| * handle REFRESH retransmission. |
| */ |
| |
| /* Schedule destroy timer */ |
| alloc->relay.timer.id = TIMER_ID_DESTROY; |
| pj_timer_heap_schedule(alloc->listener->server->core.timer_heap, |
| &alloc->relay.timer, &destroy_delay); |
| } |
| |
| /* Reschedule timeout using current lifetime setting */ |
| static pj_status_t resched_timeout(pjturn_allocation *alloc) |
| { |
| pj_time_val delay; |
| pj_status_t status; |
| |
| pj_gettimeofday(&alloc->relay.expiry); |
| alloc->relay.expiry.sec += alloc->relay.lifetime; |
| |
| pj_assert(alloc->relay.timer.id != TIMER_ID_DESTROY); |
| if (alloc->relay.timer.id != 0) { |
| pj_timer_heap_cancel(alloc->listener->server->core.timer_heap, |
| &alloc->relay.timer); |
| alloc->relay.timer.id = TIMER_ID_NONE; |
| } |
| |
| delay.sec = alloc->relay.lifetime; |
| delay.msec = 0; |
| |
| alloc->relay.timer.id = TIMER_ID_TIMEOUT; |
| status = pj_timer_heap_schedule(alloc->listener->server->core.timer_heap, |
| &alloc->relay.timer, &delay); |
| if (status != PJ_SUCCESS) { |
| alloc->relay.timer.id = TIMER_ID_NONE; |
| return status; |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |
| /* Timer timeout callback */ |
| static void relay_timeout_cb(pj_timer_heap_t *heap, pj_timer_entry *e) |
| { |
| pjturn_relay_res *rel; |
| pjturn_allocation *alloc; |
| |
| rel = (pjturn_relay_res*) e->user_data; |
| alloc = rel->allocation; |
| |
| if (e->id == TIMER_ID_TIMEOUT) { |
| |
| e->id = TIMER_ID_NONE; |
| |
| PJ_LOG(4,(alloc->obj_name, |
| "Client %s refresh timed-out, shutting down..", |
| alloc->info)); |
| |
| alloc_shutdown(alloc); |
| |
| } else if (e->id == TIMER_ID_DESTROY) { |
| e->id = TIMER_ID_NONE; |
| |
| PJ_LOG(4,(alloc->obj_name, "Client %s destroying..", |
| alloc->info)); |
| |
| pjturn_allocation_destroy(alloc); |
| } |
| } |
| |
| |
| /* |
| * Create relay. |
| */ |
| PJ_DEF(pj_status_t) pjturn_allocation_create_relay(pjturn_srv *srv, |
| pjturn_allocation *alloc, |
| const pj_stun_msg *msg, |
| const pjturn_allocation_req *req, |
| pjturn_relay_res *relay) |
| { |
| enum { RETRY = 40 }; |
| pj_pool_t *pool = alloc->pool; |
| int retry, retry_max, sock_type; |
| pj_ioqueue_callback icb; |
| int af, namelen; |
| pj_stun_string_attr *sa; |
| pj_status_t status; |
| |
| pj_bzero(relay, sizeof(*relay)); |
| |
| relay->allocation = alloc; |
| relay->tp.sock = PJ_INVALID_SOCKET; |
| |
| /* TODO: get the requested address family from somewhere */ |
| af = alloc->listener->addr.addr.sa_family; |
| |
| /* Save realm */ |
| sa = (pj_stun_string_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_REALM, 0); |
| PJ_ASSERT_RETURN(sa, PJ_EINVALIDOP); |
| pj_strdup(pool, &relay->realm, &sa->value); |
| |
| /* Save username */ |
| sa = (pj_stun_string_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_USERNAME, 0); |
| PJ_ASSERT_RETURN(sa, PJ_EINVALIDOP); |
| pj_strdup(pool, &relay->user, &sa->value); |
| |
| /* Lifetime and timeout */ |
| relay->lifetime = req->lifetime; |
| pj_timer_entry_init(&relay->timer, TIMER_ID_NONE, relay, |
| &relay_timeout_cb); |
| resched_timeout(alloc); |
| |
| /* Transport type */ |
| relay->hkey.tp_type = req->tp_type; |
| |
| /* Create the socket */ |
| if (req->tp_type == PJTURN_TP_UDP) { |
| sock_type = pj_SOCK_DGRAM(); |
| } else if (req->tp_type == PJTURN_TP_TCP) { |
| sock_type = pj_SOCK_STREAM(); |
| } else { |
| pj_assert(!"Unknown transport"); |
| return PJ_EINVALIDOP; |
| } |
| |
| status = pj_sock_socket(af, sock_type, 0, &relay->tp.sock); |
| if (status != PJ_SUCCESS) { |
| pj_bzero(relay, sizeof(*relay)); |
| return status; |
| } |
| |
| /* Find suitable port for this allocation */ |
| if (req->rpp_port) { |
| retry_max = 1; |
| } else { |
| retry_max = RETRY; |
| } |
| |
| for (retry=0; retry<retry_max; ++retry) { |
| pj_uint16_t port; |
| pj_sockaddr bound_addr; |
| |
| pj_lock_acquire(srv->core.lock); |
| |
| if (req->rpp_port) { |
| port = (pj_uint16_t) req->rpp_port; |
| } else if (req->tp_type == PJTURN_TP_UDP) { |
| port = (pj_uint16_t) srv->ports.next_udp++; |
| if (srv->ports.next_udp > srv->ports.max_udp) |
| srv->ports.next_udp = srv->ports.min_udp; |
| } else if (req->tp_type == PJTURN_TP_TCP) { |
| port = (pj_uint16_t) srv->ports.next_tcp++; |
| if (srv->ports.next_tcp > srv->ports.max_tcp) |
| srv->ports.next_tcp = srv->ports.min_tcp; |
| } else { |
| pj_assert(!"Invalid transport"); |
| } |
| |
| pj_lock_release(srv->core.lock); |
| |
| pj_sockaddr_init(af, &bound_addr, NULL, port); |
| |
| status = pj_sock_bind(relay->tp.sock, &bound_addr, |
| pj_sockaddr_get_len(&bound_addr)); |
| if (status == PJ_SUCCESS) |
| break; |
| } |
| |
| if (status != PJ_SUCCESS) { |
| /* Unable to allocate port */ |
| PJ_LOG(4,(THIS_FILE, "bind() failed: err %d", |
| status)); |
| pj_sock_close(relay->tp.sock); |
| relay->tp.sock = PJ_INVALID_SOCKET; |
| return status; |
| } |
| |
| /* Init relay key */ |
| namelen = sizeof(relay->hkey.addr); |
| status = pj_sock_getsockname(relay->tp.sock, &relay->hkey.addr, &namelen); |
| if (status != PJ_SUCCESS) { |
| PJ_LOG(4,(THIS_FILE, "pj_sock_getsockname() failed: err %d", |
| status)); |
| pj_sock_close(relay->tp.sock); |
| relay->tp.sock = PJ_INVALID_SOCKET; |
| return status; |
| } |
| if (!pj_sockaddr_has_addr(&relay->hkey.addr)) { |
| pj_sockaddr_copy_addr(&relay->hkey.addr, &alloc->listener->addr); |
| } |
| |
| /* Init ioqueue */ |
| pj_bzero(&icb, sizeof(icb)); |
| icb.on_read_complete = &on_rx_from_peer; |
| |
| status = pj_ioqueue_register_sock(pool, srv->core.ioqueue, relay->tp.sock, |
| relay, &icb, &relay->tp.key); |
| if (status != PJ_SUCCESS) { |
| PJ_LOG(4,(THIS_FILE, "pj_ioqueue_register_sock() failed: err %d", |
| status)); |
| pj_sock_close(relay->tp.sock); |
| relay->tp.sock = PJ_INVALID_SOCKET; |
| return status; |
| } |
| |
| /* Kick off pending read operation */ |
| pj_ioqueue_op_key_init(&relay->tp.read_key, sizeof(relay->tp.read_key)); |
| on_rx_from_peer(relay->tp.key, &relay->tp.read_key, 0); |
| |
| /* Done */ |
| return PJ_SUCCESS; |
| } |
| |
| /* Create and send error response */ |
| static void send_reply_err(pjturn_allocation *alloc, |
| const pj_stun_msg *req, |
| pj_bool_t cache, |
| int code, const char *errmsg) |
| { |
| pj_status_t status; |
| pj_str_t reason; |
| pj_stun_tx_data *tdata; |
| |
| status = pj_stun_session_create_res(alloc->sess, req, |
| code, (errmsg?pj_cstr(&reason,errmsg):NULL), |
| &tdata); |
| if (status != PJ_SUCCESS) { |
| alloc_err(alloc, "Error creating STUN error response", status); |
| return; |
| } |
| |
| status = pj_stun_session_send_msg(alloc->sess, cache, |
| &alloc->hkey.clt_addr, |
| pj_sockaddr_get_len(&alloc->hkey.clt_addr), |
| tdata); |
| if (status != PJ_SUCCESS) { |
| alloc_err(alloc, "Error sending STUN error response", status); |
| return; |
| } |
| } |
| |
| /* Create and send successful response */ |
| static void send_reply_ok(pjturn_allocation *alloc, |
| const pj_stun_msg *req) |
| { |
| pj_status_t status; |
| unsigned interval; |
| pj_stun_tx_data *tdata; |
| |
| status = pj_stun_session_create_res(alloc->sess, req, 0, NULL, &tdata); |
| if (status != PJ_SUCCESS) { |
| alloc_err(alloc, "Error creating STUN success response", status); |
| return; |
| } |
| |
| /* Calculate time to expiration */ |
| if (alloc->relay.lifetime != 0) { |
| pj_time_val now; |
| pj_gettimeofday(&now); |
| interval = alloc->relay.expiry.sec - now.sec; |
| } else { |
| interval = 0; |
| } |
| |
| /* Add LIFETIME. */ |
| pj_stun_msg_add_uint_attr(tdata->pool, tdata->msg, |
| PJ_STUN_ATTR_LIFETIME, interval); |
| |
| /* Add BANDWIDTH */ |
| pj_stun_msg_add_uint_attr(tdata->pool, tdata->msg, |
| PJ_STUN_ATTR_BANDWIDTH, |
| alloc->bandwidth); |
| |
| status = pj_stun_session_send_msg(alloc->sess, PJ_TRUE, |
| &alloc->hkey.clt_addr, |
| pj_sockaddr_get_len(&alloc->hkey.clt_addr), |
| tdata); |
| if (status != PJ_SUCCESS) { |
| alloc_err(alloc, "Error sending STUN success response", status); |
| return; |
| } |
| } |
| |
| |
| /* Create new permission */ |
| static pjturn_permission *create_permission(pjturn_allocation *alloc, |
| const pj_sockaddr_t *peer_addr, |
| unsigned addr_len) |
| { |
| pjturn_permission *perm; |
| |
| perm = PJ_POOL_ZALLOC_T(alloc->pool, pjturn_permission); |
| pj_memcpy(&perm->hkey.peer_addr, peer_addr, addr_len); |
| |
| if (alloc->listener->tp_type == PJTURN_TP_UDP) { |
| perm->sock = alloc->listener->sock; |
| } else { |
| pj_assert(!"TCP is not supported yet"); |
| return NULL; |
| } |
| |
| perm->allocation = alloc; |
| perm->channel = PJTURN_INVALID_CHANNEL; |
| |
| pj_gettimeofday(&perm->expiry); |
| perm->expiry.sec += PJTURN_PERM_TIMEOUT; |
| |
| return perm; |
| } |
| |
| /* Check if a permission isn't expired. Return NULL if expired. */ |
| static pjturn_permission *check_permission_expiry(pjturn_permission *perm) |
| { |
| pjturn_allocation *alloc = perm->allocation; |
| pj_time_val now; |
| |
| pj_gettimeofday(&now); |
| if (PJ_TIME_VAL_LT(perm->expiry, now)) { |
| /* Permission has not expired */ |
| return perm; |
| } |
| |
| /* Remove from permission hash table */ |
| pj_hash_set(NULL, alloc->peer_table, &perm->hkey, sizeof(perm->hkey), |
| 0, NULL); |
| |
| /* Remove from channel hash table, if assigned a channel number */ |
| if (perm->channel != PJTURN_INVALID_CHANNEL) { |
| pj_hash_set(NULL, alloc->ch_table, &perm->channel, |
| sizeof(perm->channel), 0, NULL); |
| } |
| |
| return NULL; |
| } |
| |
| /* Lookup permission in hash table by the peer address */ |
| static pjturn_permission* |
| lookup_permission_by_addr(pjturn_allocation *alloc, |
| const pj_sockaddr_t *peer_addr, |
| unsigned addr_len) |
| { |
| pjturn_permission_key key; |
| pjturn_permission *perm; |
| |
| pj_bzero(&key, sizeof(key)); |
| pj_memcpy(&key, peer_addr, addr_len); |
| |
| /* Lookup in peer hash table */ |
| perm = (pjturn_permission*) pj_hash_get(alloc->peer_table, &key, |
| sizeof(key), NULL); |
| return check_permission_expiry(perm); |
| } |
| |
| /* Lookup permission in hash table by the channel number */ |
| static pjturn_permission* |
| lookup_permission_by_chnum(pjturn_allocation *alloc, |
| unsigned chnum) |
| { |
| pj_uint16_t chnum16 = (pj_uint16_t)chnum; |
| pjturn_permission *perm; |
| |
| /* Lookup in peer hash table */ |
| perm = (pjturn_permission*) pj_hash_get(alloc->peer_table, &chnum16, |
| sizeof(chnum16), NULL); |
| return check_permission_expiry(perm); |
| } |
| |
| /* Update permission because of data from client to peer. |
| * Return PJ_TRUE is permission is found. |
| */ |
| static pj_bool_t refresh_permission(pjturn_permission *perm) |
| { |
| pj_gettimeofday(&perm->expiry); |
| if (perm->channel == PJTURN_INVALID_CHANNEL) |
| perm->expiry.sec += PJTURN_PERM_TIMEOUT; |
| else |
| perm->expiry.sec += PJTURN_CHANNEL_TIMEOUT; |
| return PJ_TRUE; |
| } |
| |
| /* |
| * Handle incoming packet from client. |
| */ |
| PJ_DEF(void) pjturn_allocation_on_rx_client_pkt( pjturn_allocation *alloc, |
| pjturn_pkt *pkt) |
| { |
| pj_bool_t is_stun; |
| pj_status_t status; |
| |
| /* Quickly check if this is STUN message */ |
| is_stun = ((*((pj_uint8_t*)pkt->pkt) & 0xC0) == 0); |
| |
| if (is_stun) { |
| /* |
| * This could be an incoming STUN requests or indications. |
| * Pass this through to the STUN session, which will call |
| * our stun_on_rx_request() or stun_on_rx_indication() |
| * callbacks. |
| */ |
| unsigned options = PJ_STUN_CHECK_PACKET; |
| if (pkt->listener->tp_type == PJTURN_TP_UDP) |
| options |= PJ_STUN_IS_DATAGRAM; |
| |
| status = pj_stun_session_on_rx_pkt(alloc->sess, pkt->pkt, pkt->len, |
| options, NULL, |
| &pkt->src.clt_addr, |
| pkt->src_addr_len); |
| if (status != PJ_SUCCESS) { |
| alloc_err(alloc, "Error handling STUN packet", status); |
| return; |
| } |
| |
| } else { |
| /* |
| * This is not a STUN packet, must be ChannelData packet. |
| */ |
| channel_data_hdr *cd = (channel_data_hdr*)pkt->pkt; |
| pjturn_permission *perm; |
| pj_ssize_t len; |
| |
| /* For UDP check the packet length */ |
| if (alloc->listener->tp_type == PJTURN_TP_UDP) { |
| if (pkt->len < pj_ntohs(cd->length)+sizeof(*cd)) { |
| PJ_LOG(4,(alloc->obj_name, |
| "ChannelData from %s discarded: UDP size error", |
| alloc->info)); |
| return; |
| } |
| } else { |
| pj_assert(!"Unsupported transport"); |
| return; |
| } |
| |
| perm = lookup_permission_by_chnum(alloc, pj_ntohs(cd->ch_number)); |
| if (!perm) { |
| /* Discard */ |
| PJ_LOG(4,(alloc->obj_name, |
| "ChannelData from %s discarded: not found", |
| alloc->info)); |
| return; |
| } |
| |
| /* Relay the data */ |
| len = pj_ntohs(cd->length); |
| pj_sock_sendto(alloc->relay.tp.sock, cd+1, &len, 0, |
| &perm->hkey.peer_addr, |
| pj_sockaddr_get_len(&perm->hkey.peer_addr)); |
| |
| /* Refresh permission */ |
| refresh_permission(perm); |
| } |
| } |
| |
| /* |
| * Handle incoming packet from peer. This function is called by |
| * on_rx_from_peer(). |
| */ |
| static void on_rx_peer_pkt(pjturn_allocation *alloc, |
| pjturn_relay_res *rel, |
| char *pkt, pj_size_t len, |
| const pj_sockaddr *src_addr) |
| { |
| pjturn_permission *perm; |
| |
| /* Lookup permission */ |
| perm = lookup_permission_by_addr(alloc, src_addr, |
| pj_sockaddr_get_len(src_addr)); |
| if (perm == NULL) { |
| /* No permission, discard data */ |
| return; |
| } |
| |
| /* Send Data Indication or ChannelData, depends on whether |
| * this permission is attached to a channel number. |
| */ |
| if (perm->channel != PJTURN_INVALID_CHANNEL) { |
| /* Send ChannelData */ |
| channel_data_hdr *cd = (channel_data_hdr*)rel->tp.tx_pkt; |
| |
| if (len > PJTURN_MAX_PKT_LEN) { |
| char peer_addr[80]; |
| pj_sockaddr_print(src_addr, peer_addr, sizeof(peer_addr), 3); |
| PJ_LOG(1,(alloc->obj_name, "Client %s: discarded data from %s " |
| "because it's too long (%d bytes)", |
| alloc->info, peer_addr, len)); |
| return; |
| } |
| |
| /* Init header */ |
| cd->ch_number = pj_htons(perm->channel); |
| cd->length = pj_htons((pj_uint16_t)len); |
| |
| /* Copy data */ |
| pj_memcpy(rel->tp.rx_pkt+sizeof(channel_data_hdr), pkt, len); |
| |
| /* Send to client */ |
| pjturn_listener_sendto(alloc->listener, rel->tp.tx_pkt, |
| len+sizeof(channel_data_hdr), 0, |
| &alloc->hkey.clt_addr, |
| pj_sockaddr_get_len(&alloc->hkey.clt_addr)); |
| } else { |
| /* Send Data Indication */ |
| pj_stun_tx_data *tdata; |
| pj_status_t status; |
| |
| status = pj_stun_session_create_ind(alloc->sess, |
| PJ_STUN_DATA_INDICATION, &tdata); |
| if (status != PJ_SUCCESS) { |
| alloc_err(alloc, "Error creating Data indication", status); |
| return; |
| } |
| } |
| } |
| |
| /* |
| * ioqueue notification on RX packets from the relay socket. |
| */ |
| static void on_rx_from_peer(pj_ioqueue_key_t *key, |
| pj_ioqueue_op_key_t *op_key, |
| pj_ssize_t bytes_read) |
| { |
| pjturn_relay_res *rel; |
| pj_status_t status; |
| |
| rel = (pjturn_relay_res*) pj_ioqueue_get_user_data(key); |
| |
| do { |
| if (bytes_read > 0) { |
| on_rx_peer_pkt(rel->allocation, rel, rel->tp.rx_pkt, |
| bytes_read, &rel->tp.src_addr); |
| } |
| |
| /* Read next packet */ |
| bytes_read = sizeof(rel->tp.rx_pkt); |
| rel->tp.src_addr_len = sizeof(rel->tp.src_addr); |
| status = pj_ioqueue_recvfrom(key, op_key, |
| rel->tp.rx_pkt, &bytes_read, 0, |
| &rel->tp.src_addr, |
| &rel->tp.src_addr_len); |
| |
| if (status != PJ_EPENDING && status != PJ_SUCCESS) |
| bytes_read = -status; |
| |
| } while (status != PJ_EPENDING && status != PJ_ECANCELLED); |
| |
| } |
| |
| /* |
| * Callback notification from STUN session when it wants to send |
| * a STUN message towards the client. |
| */ |
| static pj_status_t stun_on_send_msg(pj_stun_session *sess, |
| const void *pkt, |
| pj_size_t pkt_size, |
| const pj_sockaddr_t *dst_addr, |
| unsigned addr_len) |
| { |
| pjturn_allocation *alloc; |
| |
| alloc = (pjturn_allocation*) pj_stun_session_get_user_data(sess); |
| |
| return pjturn_listener_sendto(alloc->listener, pkt, pkt_size, 0, |
| dst_addr, addr_len); |
| } |
| |
| /* |
| * Callback notification from STUN session when it receives STUN |
| * requests. This callback was trigger by STUN incoming message |
| * processing in pjturn_allocation_on_rx_client_pkt(). |
| */ |
| static pj_status_t stun_on_rx_request(pj_stun_session *sess, |
| const pj_uint8_t *pkt, |
| unsigned pkt_len, |
| const pj_stun_msg *msg, |
| const pj_sockaddr_t *src_addr, |
| unsigned src_addr_len) |
| { |
| pjturn_allocation *alloc; |
| |
| alloc = (pjturn_allocation*) pj_stun_session_get_user_data(sess); |
| |
| /* Refuse to serve any request if we've been shutdown */ |
| if (alloc->relay.lifetime == 0) { |
| send_reply_err(alloc, msg, PJ_TRUE, |
| PJ_STUN_SC_ALLOCATION_MISMATCH, NULL); |
| return PJ_SUCCESS; |
| } |
| |
| if (msg->hdr.type == PJ_STUN_REFRESH_REQUEST) { |
| /* |
| * Handle REFRESH request |
| */ |
| pj_stun_lifetime_attr *lifetime; |
| pj_stun_bandwidth_attr *bandwidth; |
| |
| /* Get LIFETIME attribute */ |
| lifetime = (pj_stun_lifetime_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_LIFETIME, 0); |
| |
| /* Get BANDWIDTH attribute */ |
| bandwidth = (pj_stun_bandwidth_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_BANDWIDTH, 0); |
| |
| if (lifetime && lifetime->value==0) { |
| /* |
| * This is deallocation request. |
| */ |
| alloc->relay.lifetime = 0; |
| |
| /* Respond first */ |
| send_reply_ok(alloc, msg); |
| |
| /* Shutdown allocation */ |
| PJ_LOG(4,(alloc->obj_name, |
| "Client %s request to dealloc, shutting down", |
| alloc->info)); |
| |
| alloc_shutdown(alloc); |
| |
| } else { |
| /* |
| * This is a refresh request. |
| */ |
| |
| /* Update lifetime */ |
| if (lifetime) { |
| alloc->relay.lifetime = lifetime->value; |
| } |
| |
| /* Update bandwidth */ |
| // TODO: |
| |
| /* Update expiration timer */ |
| resched_timeout(alloc); |
| |
| /* Send reply */ |
| send_reply_ok(alloc, msg); |
| } |
| |
| } else if (msg->hdr.type == PJ_STUN_CHANNEL_BIND_REQUEST) { |
| /* |
| * ChannelBind request. |
| */ |
| pj_stun_channel_number_attr *ch_attr; |
| pj_stun_peer_addr_attr *peer_attr; |
| pjturn_permission *p1, *p2; |
| |
| ch_attr = (pj_stun_channel_number_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_CHANNEL_NUMBER, 0); |
| peer_attr = (pj_stun_peer_addr_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_PEER_ADDR, 0); |
| |
| if (!ch_attr || !peer_attr) { |
| send_reply_err(alloc, msg, PJ_TRUE, PJ_STUN_SC_BAD_REQUEST, NULL); |
| return PJ_SUCCESS; |
| } |
| |
| /* Find permission with the channel number */ |
| p1 = lookup_permission_by_chnum(alloc, PJ_STUN_GET_CH_NB(ch_attr->value)); |
| |
| /* If permission is found, this is supposed to be a channel bind |
| * refresh. Make sure it's for the same peer. |
| */ |
| if (p1) { |
| if (pj_sockaddr_cmp(&p1->hkey.peer_addr, &peer_attr->sockaddr)) { |
| /* Address mismatch. Send 400 */ |
| send_reply_err(alloc, msg, PJ_TRUE, |
| PJ_STUN_SC_BAD_REQUEST, |
| "Peer address mismatch"); |
| return PJ_SUCCESS; |
| } |
| |
| /* Refresh permission */ |
| refresh_permission(p1); |
| |
| /* Done */ |
| return PJ_SUCCESS; |
| } |
| |
| /* If permission is not found, create a new one. Make sure the peer |
| * has not alreadyy assigned with a channel number. |
| */ |
| p2 = lookup_permission_by_addr(alloc, &peer_attr->sockaddr, |
| pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| if (p2 && p2->channel != PJTURN_INVALID_CHANNEL) { |
| send_reply_err(alloc, msg, PJ_TRUE, PJ_STUN_SC_BAD_REQUEST, |
| "Peer address already assigned a channel number"); |
| return PJ_SUCCESS; |
| } |
| |
| /* Create permission if it doesn't exist */ |
| if (!p2) { |
| p2 = create_permission(alloc, &peer_attr->sockaddr, |
| pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| if (!p2) |
| return PJ_SUCCESS; |
| } |
| |
| /* Assign channel number to permission */ |
| p2->channel = PJ_STUN_GET_CH_NB(ch_attr->value); |
| |
| /* Update */ |
| refresh_permission(p2); |
| |
| /* Reply */ |
| send_reply_ok(alloc, msg); |
| |
| return PJ_SUCCESS; |
| |
| } else if (msg->hdr.type == PJ_STUN_ALLOCATE_REQUEST) { |
| |
| /* Respond with 437 (section 6.3 turn-07) */ |
| send_reply_err(alloc, msg, PJ_TRUE, PJ_STUN_SC_ALLOCATION_MISMATCH, NULL); |
| |
| } else { |
| |
| /* Respond with Bad Request? */ |
| send_reply_err(alloc, msg, PJ_TRUE, PJ_STUN_SC_BAD_REQUEST, NULL); |
| |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| /* |
| * Callback notification from STUN session when it receives STUN |
| * indications. This callback was trigger by STUN incoming message |
| * processing in pjturn_allocation_on_rx_client_pkt(). |
| */ |
| static pj_status_t stun_on_rx_indication(pj_stun_session *sess, |
| const pj_uint8_t *pkt, |
| unsigned pkt_len, |
| const pj_stun_msg *msg, |
| const pj_sockaddr_t *src_addr, |
| unsigned src_addr_len) |
| { |
| pj_stun_peer_addr_attr *peer_attr; |
| pj_stun_data_attr *data_attr; |
| pjturn_allocation *alloc; |
| pjturn_permission *perm; |
| |
| alloc = (pjturn_allocation*) pj_stun_session_get_user_data(sess); |
| |
| /* Only expect Send Indication */ |
| if (msg->hdr.type != PJ_STUN_SEND_INDICATION) { |
| /* Ignore */ |
| return PJ_SUCCESS; |
| } |
| |
| /* Get PEER-ADDRESS attribute */ |
| peer_attr = (pj_stun_peer_addr_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_PEER_ADDR, 0); |
| |
| /* MUST have PEER-ADDRESS attribute */ |
| if (!peer_attr) |
| return PJ_SUCCESS; |
| |
| /* Get DATA attribute */ |
| data_attr = (pj_stun_data_attr*) |
| pj_stun_msg_find_attr(msg, PJ_STUN_ATTR_DATA, 0); |
| |
| /* Create/update/refresh the permission */ |
| perm = lookup_permission_by_addr(alloc, &peer_attr->sockaddr, |
| pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| if (perm == NULL) { |
| perm = create_permission(alloc, &peer_attr->sockaddr, |
| pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| } |
| refresh_permission(perm); |
| |
| /* Return if we don't have data */ |
| if (data_attr == NULL) |
| return PJ_SUCCESS; |
| |
| /* Relay the data to client */ |
| if (alloc->hkey.tp_type == PJTURN_TP_UDP) { |
| pj_ssize_t len = data_attr->length; |
| pj_sock_sendto(alloc->listener->sock, data_attr->data, |
| &len, 0, &peer_attr->sockaddr, |
| pj_sockaddr_get_len(&peer_attr->sockaddr)); |
| } else { |
| pj_assert(!"TCP is not supported"); |
| } |
| |
| return PJ_SUCCESS; |
| } |
| |
| |