pjlib-util/src/pjlib-util/stun_simple_client.c - pjproject - Gitiles

 /* $Id$ */
 /*
  * Copyright (C) 2003-2006 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/os.h>
 #include <pj/pool.h>
 #include <pj/rand.h>
 #include <pj/sock_select.h>
 #include <pj/string.h>


 enum { MAX_REQUEST = 3 };
 static int stun_timer[] = {1600, 1600, 1600 };

 #define THIS_FILE	"stun_client.c"
 #define LOG_ADDR(addr)	pj_inet_ntoa(addr.sin_addr), pj_ntohs(addr.sin_port)


 PJ_DECL(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[])
 {
     pj_sockaddr_in srv_addr[2];
     int i, j, send_cnt = 0;
     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();

     /* Create pool. */
     pool = pj_pool_create(pf, "stun%p", 1024, 1024, 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;
     }


     /* 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;

     /* Resolve servers. */
     status = pj_sockaddr_in_init(&srv_addr[0], srv1, (pj_uint16_t)port1);
     if (status != PJ_SUCCESS)
 	goto on_error;

     status = pj_sockaddr_in_init(&srv_addr[1], srv2, (pj_uint16_t)port2);
     if (status != PJ_SUCCESS)
 	goto on_error;

     /* Init mapped addresses to zero */
     pj_memset(mapped_addr, 0, sock_cnt * sizeof(pj_sockaddr_in));

     /* 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) {
 	    for (j=0; j<2 && 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));
 		if (status == PJ_SUCCESS)
 		    ++wait_resp;
 	    }
 	}

 	/* 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.
 	 */

 	/* Calculate time of next retransmission. */
 	pj_gettimeofday(&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_gettimeofday(&now), select_rc=1;
 	     status==PJ_SUCCESS && select_rc==1 && wait_resp>0
 	       && PJ_TIME_VAL_LT(now, next_tx);
 	     pj_gettimeofday(&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(FD_SETSIZE, &r, NULL, NULL, &timeout);
 	    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);

 		--wait_resp;

 		if (status != PJ_SUCCESS)
 		    continue;

 		status = pjstun_parse_msg(recv_buf, len, &msg);
 		if (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 || 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 (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) {
 		    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;
 	    }
 	}

 	/* 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;
     }

     for (i=0; i<sock_cnt && status==PJ_SUCCESS; ++i) {
 	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;
 	}
     }

     pj_pool_release(pool);

     return status;

 on_error:
     if (pool) pj_pool_release(pool);
     return status;
 }
	/* $Id$ */
	/*
	* Copyright (C) 2003-2006 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/os.h>
	#include <pj/pool.h>
	#include <pj/rand.h>
	#include <pj/sock_select.h>
	#include <pj/string.h>


	enum { MAX_REQUEST = 3 };
	static int stun_timer[] = {1600, 1600, 1600 };

	#define THIS_FILE "stun_client.c"
	#define LOG_ADDR(addr) pj_inet_ntoa(addr.sin_addr), pj_ntohs(addr.sin_port)


	PJ_DECL(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[])
	{
	pj_sockaddr_in srv_addr[2];
	int i, j, send_cnt = 0;
	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();

	/* Create pool. */
	pool = pj_pool_create(pf, "stun%p", 1024, 1024, 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;
	}


	/* 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;

	/* Resolve servers. */
	status = pj_sockaddr_in_init(&srv_addr[0], srv1, (pj_uint16_t)port1);
	if (status != PJ_SUCCESS)
	goto on_error;

	status = pj_sockaddr_in_init(&srv_addr[1], srv2, (pj_uint16_t)port2);
	if (status != PJ_SUCCESS)
	goto on_error;

	/* Init mapped addresses to zero */
	pj_memset(mapped_addr, 0, sock_cnt * sizeof(pj_sockaddr_in));

	/* 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) {
	for (j=0; j<2 && 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));
	if (status == PJ_SUCCESS)
	++wait_resp;
	}
	}

	/* 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.
	*/

	/* Calculate time of next retransmission. */
	pj_gettimeofday(&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_gettimeofday(&now), select_rc=1;
	status==PJ_SUCCESS && select_rc==1 && wait_resp>0
	&& PJ_TIME_VAL_LT(now, next_tx);
	pj_gettimeofday(&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(FD_SETSIZE, &r, NULL, NULL, &timeout);
	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);

	--wait_resp;

	if (status != PJ_SUCCESS)
	continue;

	status = pjstun_parse_msg(recv_buf, len, &msg);
	if (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 \|\| 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 (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) {
	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;
	}
	}

	/* 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;
	}

	for (i=0; i<sock_cnt && status==PJ_SUCCESS; ++i) {
	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;
	}
	}

	pj_pool_release(pool);

	return status;

	on_error:
	if (pool) pj_pool_release(pool);
	return status;
	}