| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 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 <pjlib-util/stun_simple.h> |
| #include <pjlib-util/errno.h> |
| #include <pj/log.h> |
| #include <pj/os.h> |
| #include <pj/pool.h> |
| #include <pj/rand.h> |
| #include <pj/sock_select.h> |
| #include <pj/string.h> |
| |
| |
| enum { MAX_REQUEST = 4 }; |
| static int stun_timer[] = {500, 500, 500, 500 }; |
| #define STUN_MAGIC 0x2112A442 |
| |
| #define THIS_FILE "stun_client.c" |
| #define LOG_ADDR(addr) pj_inet_ntoa(addr.sin_addr), pj_ntohs(addr.sin_port) |
| |
| #define TRACE_(x) PJ_LOG(6,x) |
| |
| PJ_DEF(pj_status_t) pjstun_get_mapped_addr( pj_pool_factory *pf, |
| int sock_cnt, pj_sock_t sock[], |
| const pj_str_t *srv1, int port1, |
| const pj_str_t *srv2, int port2, |
| pj_sockaddr_in mapped_addr[]) |
| { |
| pjstun_setting opt; |
| |
| pj_bzero(&opt, sizeof(opt)); |
| opt.use_stun2 = PJ_FALSE; |
| opt.srv1 = *srv1; |
| opt.port1 = port1; |
| opt.srv2 = *srv2; |
| opt.port2 = port2; |
| |
| return pjstun_get_mapped_addr2(pf, &opt, sock_cnt, sock, mapped_addr); |
| } |
| |
| PJ_DEF(pj_status_t) pjstun_get_mapped_addr2(pj_pool_factory *pf, |
| const pjstun_setting *opt, |
| int sock_cnt, |
| pj_sock_t sock[], |
| pj_sockaddr_in mapped_addr[]) |
| { |
| unsigned srv_cnt; |
| const pj_str_t *srv1, *srv2; |
| int port1, port2; |
| pj_sockaddr_in srv_addr[2]; |
| int i, send_cnt = 0, nfds; |
| pj_pool_t *pool; |
| struct query_rec { |
| struct { |
| pj_uint32_t mapped_addr; |
| pj_uint32_t mapped_port; |
| } srv[2]; |
| } *rec; |
| void *out_msg; |
| pj_size_t out_msg_len; |
| int wait_resp = 0; |
| pj_status_t status; |
| |
| PJ_CHECK_STACK(); |
| |
| srv1 = &opt->srv1; |
| port1 = opt->port1; |
| srv2 = &opt->srv1; |
| port2 = opt->port2; |
| |
| TRACE_((THIS_FILE, "Entering pjstun_get_mapped_addr()")); |
| |
| /* Create pool. */ |
| pool = pj_pool_create(pf, "stun%p", 400, 400, NULL); |
| if (!pool) |
| return PJ_ENOMEM; |
| |
| |
| /* Allocate client records */ |
| rec = (struct query_rec*) pj_pool_calloc(pool, sock_cnt, sizeof(*rec)); |
| if (!rec) { |
| status = PJ_ENOMEM; |
| goto on_error; |
| } |
| |
| TRACE_((THIS_FILE, " Memory allocated.")); |
| |
| /* Create the outgoing BIND REQUEST message template */ |
| status = pjstun_create_bind_req( pool, &out_msg, &out_msg_len, |
| pj_rand(), pj_rand()); |
| if (status != PJ_SUCCESS) |
| goto on_error; |
| |
| /* Insert magic cookie (specified in RFC 5389) when requested to. */ |
| if (opt->use_stun2) { |
| pjstun_msg_hdr *hdr = (pjstun_msg_hdr*)out_msg; |
| hdr->tsx[0] = pj_htonl(STUN_MAGIC); |
| } |
| |
| TRACE_((THIS_FILE, " Binding request created.")); |
| |
| /* Resolve servers. */ |
| status = pj_sockaddr_in_init(&srv_addr[0], srv1, (pj_uint16_t)port1); |
| if (status != PJ_SUCCESS) |
| goto on_error; |
| |
| srv_cnt = 1; |
| |
| if (srv2 && port2) { |
| status = pj_sockaddr_in_init(&srv_addr[1], srv2, (pj_uint16_t)port2); |
| if (status != PJ_SUCCESS) |
| goto on_error; |
| |
| if (srv_addr[1].sin_addr.s_addr != srv_addr[0].sin_addr.s_addr && |
| srv_addr[1].sin_port != srv_addr[0].sin_port) |
| { |
| srv_cnt++; |
| } |
| } |
| |
| TRACE_((THIS_FILE, " Server initialized, using %d server(s)", srv_cnt)); |
| |
| /* Init mapped addresses to zero */ |
| pj_memset(mapped_addr, 0, sock_cnt * sizeof(pj_sockaddr_in)); |
| |
| /* We need these many responses */ |
| wait_resp = sock_cnt * srv_cnt; |
| |
| TRACE_((THIS_FILE, " Done initialization.")); |
| |
| #if defined(PJ_SELECT_NEEDS_NFDS) && PJ_SELECT_NEEDS_NFDS!=0 |
| nfds = -1; |
| for (i=0; i<sock_cnt; ++i) { |
| if (sock[i] > nfds) { |
| nfds = sock[i]; |
| } |
| } |
| #else |
| nfds = PJ_IOQUEUE_MAX_HANDLES-1; |
| #endif |
| |
| /* Main retransmission loop. */ |
| for (send_cnt=0; send_cnt<MAX_REQUEST; ++send_cnt) { |
| pj_time_val next_tx, now; |
| pj_fd_set_t r; |
| int select_rc; |
| |
| PJ_FD_ZERO(&r); |
| |
| /* Send messages to servers that has not given us response. */ |
| for (i=0; i<sock_cnt && status==PJ_SUCCESS; ++i) { |
| unsigned j; |
| for (j=0; j<srv_cnt && status==PJ_SUCCESS; ++j) { |
| pjstun_msg_hdr *msg_hdr = (pjstun_msg_hdr*) out_msg; |
| pj_ssize_t sent_len; |
| |
| if (rec[i].srv[j].mapped_port != 0) |
| continue; |
| |
| /* Modify message so that we can distinguish response. */ |
| msg_hdr->tsx[2] = pj_htonl(i); |
| msg_hdr->tsx[3] = pj_htonl(j); |
| |
| /* Send! */ |
| sent_len = out_msg_len; |
| status = pj_sock_sendto(sock[i], out_msg, &sent_len, 0, |
| (pj_sockaddr_t*)&srv_addr[j], |
| sizeof(pj_sockaddr_in)); |
| } |
| } |
| |
| /* All requests sent. |
| * The loop below will wait for responses until all responses have |
| * been received (i.e. wait_resp==0) or timeout occurs, which then |
| * we'll go to the next retransmission iteration. |
| */ |
| TRACE_((THIS_FILE, " Request(s) sent, counter=%d", send_cnt)); |
| |
| /* Calculate time of next retransmission. */ |
| pj_gettickcount(&next_tx); |
| next_tx.sec += (stun_timer[send_cnt]/1000); |
| next_tx.msec += (stun_timer[send_cnt]%1000); |
| pj_time_val_normalize(&next_tx); |
| |
| for (pj_gettickcount(&now), select_rc=1; |
| status==PJ_SUCCESS && select_rc>=1 && wait_resp>0 |
| && PJ_TIME_VAL_LT(now, next_tx); |
| pj_gettickcount(&now)) |
| { |
| pj_time_val timeout; |
| |
| timeout = next_tx; |
| PJ_TIME_VAL_SUB(timeout, now); |
| |
| for (i=0; i<sock_cnt; ++i) { |
| PJ_FD_SET(sock[i], &r); |
| } |
| |
| select_rc = pj_sock_select(nfds+1, &r, NULL, NULL, &timeout); |
| TRACE_((THIS_FILE, " select() rc=%d", select_rc)); |
| if (select_rc < 1) |
| continue; |
| |
| for (i=0; i<sock_cnt; ++i) { |
| int sock_idx, srv_idx; |
| pj_ssize_t len; |
| pjstun_msg msg; |
| pj_sockaddr_in addr; |
| int addrlen = sizeof(addr); |
| pjstun_mapped_addr_attr *attr; |
| char recv_buf[128]; |
| |
| if (!PJ_FD_ISSET(sock[i], &r)) |
| continue; |
| |
| len = sizeof(recv_buf); |
| status = pj_sock_recvfrom( sock[i], recv_buf, |
| &len, 0, |
| (pj_sockaddr_t*)&addr, |
| &addrlen); |
| |
| if (status != PJ_SUCCESS) { |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| |
| PJ_LOG(4,(THIS_FILE, "recvfrom() error ignored: %s", |
| pj_strerror(status, errmsg,sizeof(errmsg)).ptr)); |
| |
| /* Ignore non-PJ_SUCCESS status. |
| * It possible that other SIP entity is currently |
| * sending SIP request to us, and because SIP message |
| * is larger than STUN, we could get EMSGSIZE when |
| * we call recvfrom(). |
| */ |
| status = PJ_SUCCESS; |
| continue; |
| } |
| |
| status = pjstun_parse_msg(recv_buf, len, &msg); |
| if (status != PJ_SUCCESS) { |
| char errmsg[PJ_ERR_MSG_SIZE]; |
| |
| PJ_LOG(4,(THIS_FILE, "STUN parsing error ignored: %s", |
| pj_strerror(status, errmsg,sizeof(errmsg)).ptr)); |
| |
| /* Also ignore non-successful parsing. This may not |
| * be STUN response at all. See the comment above. |
| */ |
| status = PJ_SUCCESS; |
| continue; |
| } |
| |
| sock_idx = pj_ntohl(msg.hdr->tsx[2]); |
| srv_idx = pj_ntohl(msg.hdr->tsx[3]); |
| |
| if (sock_idx<0 || sock_idx>=sock_cnt || sock_idx!=i || |
| srv_idx<0 || srv_idx>=2) |
| { |
| status = PJLIB_UTIL_ESTUNININDEX; |
| continue; |
| } |
| |
| if (pj_ntohs(msg.hdr->type) != PJSTUN_BINDING_RESPONSE) { |
| status = PJLIB_UTIL_ESTUNNOBINDRES; |
| continue; |
| } |
| |
| if (rec[sock_idx].srv[srv_idx].mapped_port != 0) { |
| /* Already got response */ |
| continue; |
| } |
| |
| /* From this part, we consider the packet as a valid STUN |
| * response for our request. |
| */ |
| --wait_resp; |
| |
| if (pjstun_msg_find_attr(&msg, PJSTUN_ATTR_ERROR_CODE) != NULL) { |
| status = PJLIB_UTIL_ESTUNRECVERRATTR; |
| continue; |
| } |
| |
| attr = (pjstun_mapped_addr_attr*) |
| pjstun_msg_find_attr(&msg, PJSTUN_ATTR_MAPPED_ADDR); |
| if (!attr) { |
| attr = (pjstun_mapped_addr_attr*) |
| pjstun_msg_find_attr(&msg, PJSTUN_ATTR_XOR_MAPPED_ADDR); |
| if (!attr || attr->family != 1) { |
| status = PJLIB_UTIL_ESTUNNOMAP; |
| continue; |
| } |
| } |
| |
| rec[sock_idx].srv[srv_idx].mapped_addr = attr->addr; |
| rec[sock_idx].srv[srv_idx].mapped_port = attr->port; |
| if (pj_ntohs(attr->hdr.type) == PJSTUN_ATTR_XOR_MAPPED_ADDR) { |
| rec[sock_idx].srv[srv_idx].mapped_addr ^= pj_htonl(STUN_MAGIC); |
| rec[sock_idx].srv[srv_idx].mapped_port ^= pj_htons(STUN_MAGIC >> 16); |
| } |
| } |
| } |
| |
| /* The best scenario is if all requests have been replied. |
| * Then we don't need to go to the next retransmission iteration. |
| */ |
| if (wait_resp <= 0) |
| break; |
| } |
| |
| TRACE_((THIS_FILE, " All responses received, calculating result..")); |
| |
| for (i=0; i<sock_cnt && status==PJ_SUCCESS; ++i) { |
| if (srv_cnt == 1) { |
| mapped_addr[i].sin_family = pj_AF_INET(); |
| mapped_addr[i].sin_addr.s_addr = rec[i].srv[0].mapped_addr; |
| mapped_addr[i].sin_port = (pj_uint16_t)rec[i].srv[0].mapped_port; |
| |
| if (rec[i].srv[0].mapped_addr == 0 || rec[i].srv[0].mapped_port == 0) { |
| status = PJLIB_UTIL_ESTUNNOTRESPOND; |
| break; |
| } |
| } else if (rec[i].srv[0].mapped_addr == rec[i].srv[1].mapped_addr && |
| rec[i].srv[0].mapped_port == rec[i].srv[1].mapped_port) |
| { |
| mapped_addr[i].sin_family = pj_AF_INET(); |
| mapped_addr[i].sin_addr.s_addr = rec[i].srv[0].mapped_addr; |
| mapped_addr[i].sin_port = (pj_uint16_t)rec[i].srv[0].mapped_port; |
| |
| if (rec[i].srv[0].mapped_addr == 0 || rec[i].srv[0].mapped_port == 0) { |
| status = PJLIB_UTIL_ESTUNNOTRESPOND; |
| break; |
| } |
| } else { |
| status = PJLIB_UTIL_ESTUNSYMMETRIC; |
| break; |
| } |
| } |
| |
| TRACE_((THIS_FILE, " Pool usage=%d of %d", pj_pool_get_used_size(pool), |
| pj_pool_get_capacity(pool))); |
| |
| pj_pool_release(pool); |
| |
| TRACE_((THIS_FILE, " Done.")); |
| return status; |
| |
| on_error: |
| if (pool) pj_pool_release(pool); |
| return status; |
| } |
| |