client_main.c

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/* $Id: client_main.c 1303 2007-05-25 11:31:09Z bennylp $ */
/* 
 * Copyright (C) 2003-2005 Benny Prijono <[e-mail]>
 *
 * 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 <pjnath.h>
#include <pjlib-util.h>
#include <pjlib.h>


#define THIS_FILE	"client_main.c"
#define LOCAL_PORT	1998
#define BANDWIDTH	64		    /* -1 to disable */
#define LIFETIME	600		    /* -1 to disable */
#define REQ_TRANSPORT	-1		    /* 0: udp, 1: tcp, -1: disable */
#define REQ_PORT_PROPS	-1		    /* -1 to disable */
#define REQ_IP		0		    /* IP address string */

//#define OPTIONS		PJ_STUN_NO_AUTHENTICATE
#define OPTIONS		0


static struct global
{
    pj_stun_config	 stun_config;
    pj_pool_t		*pool;
    pj_caching_pool	 cp;
    pj_timer_heap_t	*th;
    pj_stun_session	*sess;
    pj_sock_t		 sock;
    pj_sock_t		 peer_sock;
    pj_thread_t		*thread;
    pj_bool_t		 quit;
    pj_sockaddr_in	 peer_addr;
    pj_sockaddr_in	 srv_addr;
    pj_sockaddr_in	 relay_addr;
    char		 data_buf[256];
    char		*data;
} g;

static struct options
{
    char    *srv_addr;
    char    *srv_port;
    char    *realm;
    char    *user_name;
    char    *password;
    char    *nonce;
    char    *peer_addr;
    pj_bool_t use_fingerprint;
} o;


static pj_status_t parse_addr(const char *input, pj_sockaddr_in *addr);


static void my_perror(const char *title, pj_status_t status)
{
    char errmsg[PJ_ERR_MSG_SIZE];
    pj_strerror(status, errmsg, sizeof(errmsg));

    PJ_LOG(3,(THIS_FILE, "%s: %s", title, errmsg));
}

static pj_status_t on_send_msg(pj_stun_session *sess,
			       const void *pkt,
			       pj_size_t pkt_size,
			       const pj_sockaddr_t *srv_addr,
			       unsigned addr_len)
{
    pj_ssize_t len;
    pj_status_t status;

    len = pkt_size;
    status = pj_sock_sendto(g.sock, pkt, &len, 0, srv_addr, addr_len);

    if (status != PJ_SUCCESS)
	my_perror("Error sending packet", status);

    return status;
}

static void on_request_complete(pj_stun_session *sess,
			        pj_status_t status,
			        pj_stun_tx_data *tdata,
			        const pj_stun_msg *response,
				const pj_sockaddr_t *src_addr,
				unsigned src_addr_len)
{
    PJ_UNUSED_ARG(src_addr);
    PJ_UNUSED_ARG(src_addr_len);

    if (status == PJ_SUCCESS) {
	switch (response->hdr.type) {
	case PJ_STUN_ALLOCATE_RESPONSE:
	    {
		pj_stun_relay_addr_attr *ar;
		pj_stun_lifetime_attr *al;

		al = (pj_stun_lifetime_attr*)
		     pj_stun_msg_find_attr(response, 
					   PJ_STUN_ATTR_LIFETIME, 0);
		if (!al) {
		    PJ_LOG(1,(THIS_FILE, "Error: LIFETIME attribute not present"));
		    return;
		}

		ar = (pj_stun_relay_addr_attr*)
		     pj_stun_msg_find_attr(response, 
					   PJ_STUN_ATTR_RELAY_ADDR, 0);
		if (ar) {
		    pj_memcpy(&g.relay_addr, &ar->sockaddr.ipv4,
			      sizeof(pj_sockaddr_in));
		    PJ_LOG(3,(THIS_FILE, "Relay address is %s:%d",
			      pj_inet_ntoa(g.relay_addr.sin_addr),
			      (int)pj_ntohs(g.relay_addr.sin_port)));
		} else {
		    pj_memset(&g.relay_addr, 0, sizeof(g.relay_addr));
		}

		if (al->value == 0) {
		    PJ_LOG(3,(THIS_FILE, "Relay deallocated"));
		}
	    }
	    break;
	}
    } else {
	my_perror("Client transaction error", status);
    }
}

static int worker_thread(void *unused)
{
    PJ_UNUSED_ARG(unused);

    while (!g.quit) {
	pj_time_val timeout =  {0, 50};
	pj_fd_set_t readset;
	int n;

	pj_timer_heap_poll(g.th, NULL);

	PJ_FD_ZERO(&readset);
	PJ_FD_SET(g.sock, &readset);
	PJ_FD_SET(g.peer_sock, &readset);

	n = (g.peer_sock > g.sock) ? g.peer_sock : g.sock;
	n = pj_sock_select(n+1, &readset, NULL, NULL, &timeout);
	if (n > 0) {
	    if (PJ_FD_ISSET(g.sock, &readset)) {
		pj_uint8_t buffer[512];
		pj_ssize_t len;
		pj_sockaddr_in addr;
		int addrlen;
		pj_status_t rc;

		len = sizeof(buffer);
		addrlen = sizeof(addr);
		rc = pj_sock_recvfrom(g.sock, buffer, &len, 0, &addr, &addrlen);
		if (rc != PJ_SUCCESS || len <= 0)
		    continue;

		if (pj_stun_msg_check(buffer, len, PJ_STUN_IS_DATAGRAM)==PJ_SUCCESS) {
		    rc = pj_stun_session_on_rx_pkt(g.sess, buffer, len, 
						   OPTIONS, 
						   NULL, &addr, addrlen);
		    if (rc != PJ_SUCCESS)
			my_perror("Error processing packet", rc);

		} else {
		    buffer[len] = '\0';
		    PJ_LOG(3,(THIS_FILE, "Received data on client sock: %s", (char*)buffer));
		}

	    } else if (PJ_FD_ISSET(g.peer_sock, &readset)) {
		pj_uint8_t buffer[512];
		pj_ssize_t len;
		pj_sockaddr_in addr;
		int addrlen;
		pj_status_t rc;

		len = sizeof(buffer);
		addrlen = sizeof(addr);
		rc = pj_sock_recvfrom(g.peer_sock, buffer, &len, 0, &addr, &addrlen);
		if (rc != PJ_SUCCESS || len <= 0)
		    continue;

		buffer[len] = '\0';

		if (pj_stun_msg_check(buffer, len, PJ_STUN_IS_DATAGRAM)==PJ_SUCCESS) {
		    pj_stun_msg *msg;

		    rc = pj_stun_msg_decode(g.pool, (pj_uint8_t*)buffer, len, 0,
					    &msg, NULL, NULL);
		    if (rc != PJ_SUCCESS) {
			my_perror("Error decoding packet on peer sock", rc);
		    } else {
			pj_stun_msg_dump(msg, (char*)buffer, sizeof(buffer), NULL);
			PJ_LOG(3,(THIS_FILE, "Received STUN packet on peer sock: %s",
				  buffer));
		    }

		} else {
		    PJ_LOG(3,(THIS_FILE, "Received data on peer sock: %s", (char*)buffer));
		}

	    }

	} else if (n < 0)
	    pj_thread_sleep(50);
    }

    return 0;
}

static int init()
{
    pj_sockaddr_in addr;
    pj_stun_session_cb stun_cb;
    int len;
    pj_status_t status;

    g.sock = PJ_INVALID_SOCKET;

    status = pj_init();
    status = pjlib_util_init();
    status = pjnath_init();

    pj_caching_pool_init(&g.cp, &pj_pool_factory_default_policy, 0);

    if (o.srv_addr) {
	pj_str_t s;
	pj_uint16_t port;

	if (o.srv_port)
	    port = (pj_uint16_t) atoi(o.srv_port);
	else
	    port = PJ_STUN_PORT;

	status = pj_sockaddr_in_init(&g.srv_addr, pj_cstr(&s, o.srv_addr), port);
	if (status != PJ_SUCCESS) {
	    my_perror("Invalid address", status);
	    return status;
	}

	printf("Destination address set to %s:%d\n", o.srv_addr, (int)port);
    } else {
	printf("Error: address must be specified\n");
	return PJ_EINVAL;
    }

    g.pool = pj_pool_create(&g.cp.factory, NULL, 1000, 1000, NULL);

    status = pj_timer_heap_create(g.pool, 1000, &g.th);
    pj_assert(status == PJ_SUCCESS);

    pj_stun_config_init(&g.stun_config, &g.cp.factory, 0, NULL, g.th);
    pj_assert(status == PJ_SUCCESS);

    status = pj_sock_socket(PJ_AF_INET, PJ_SOCK_DGRAM, 0, &g.peer_sock);
    pj_assert(status == PJ_SUCCESS);

    status = pj_sock_bind_in(g.peer_sock, 0, 0);
    pj_assert(status == PJ_SUCCESS);

    status = pj_sock_socket(PJ_AF_INET, PJ_SOCK_DGRAM, 0, &g.sock);
    pj_assert(status == PJ_SUCCESS);

    status = pj_sockaddr_in_init(&addr, NULL, 0);
    pj_assert(status == PJ_SUCCESS);

    addr.sin_port = pj_htons((pj_uint16_t)LOCAL_PORT);
    status = pj_sock_bind(g.sock, &addr, sizeof(addr));
    pj_assert(status == PJ_SUCCESS);

    len = sizeof(addr);
    status = pj_sock_getsockname(g.sock, &addr, &len);
    pj_assert(status == PJ_SUCCESS);

    PJ_LOG(3,(THIS_FILE, "Listening on port %d", (int)pj_ntohs(addr.sin_port)));

    len = sizeof(g.peer_addr);
    status = pj_sock_getsockname(g.peer_sock, &g.peer_addr, &len);
    if (g.peer_addr.sin_addr.s_addr == 0)
	pj_gethostip(&g.peer_addr.sin_addr);

    PJ_LOG(3,(THIS_FILE, "Peer is on port %d", (int)pj_ntohs(g.peer_addr.sin_port)));

    pj_memset(&stun_cb, 0, sizeof(stun_cb));
    stun_cb.on_send_msg = &on_send_msg;
    stun_cb.on_request_complete = &on_request_complete;

    status = pj_stun_session_create(&g.stun_config, NULL, &stun_cb, 
				    o.use_fingerprint!=0, &g.sess);
    pj_assert(status == PJ_SUCCESS);

    if (o.user_name) {
	pj_stun_auth_cred cred;

	pj_bzero(&cred, sizeof(cred));

	cred.type = PJ_STUN_AUTH_CRED_STATIC;
	cred.data.static_cred.realm = pj_str(o.realm);
	cred.data.static_cred.username = pj_str(o.user_name);
	cred.data.static_cred.data_type = 0;
	cred.data.static_cred.data = pj_str(o.password);
	cred.data.static_cred.nonce = pj_str(o.nonce);

	pj_stun_session_set_credential(g.sess, &cred);
	puts("Session credential set");
    } else {
	puts("Credential not set");
    }

    if (o.peer_addr) {
	if (parse_addr(o.peer_addr, &g.peer_addr)!=PJ_SUCCESS)
	    return -1;
    }

    status = pj_thread_create(g.pool, "stun", &worker_thread, NULL, 
			      0, 0, &g.thread);
    if (status != PJ_SUCCESS)
	return status;

    return PJ_SUCCESS;
}


static int shutdown()
{
    if (g.thread) {
	g.quit = 1;
	pj_thread_join(g.thread);
	pj_thread_destroy(g.thread);
	g.thread = NULL;
    }
    if (g.sess)
	pj_stun_session_destroy(g.sess);
    if (g.sock != PJ_INVALID_SOCKET)
	pj_sock_close(g.sock);
    if (g.th)
	pj_timer_heap_destroy(g.th);
    if (g.pool)
	pj_pool_release(g.pool);

    pj_pool_factory_dump(&g.cp.factory, PJ_TRUE);
    pj_caching_pool_destroy(&g.cp);

    return PJ_SUCCESS;
}

static void send_bind_request(void)
{
    pj_stun_tx_data *tdata;
    pj_status_t rc;

    rc = pj_stun_session_create_req(g.sess, PJ_STUN_BINDING_REQUEST, 
				    NULL, &tdata);
    pj_assert(rc == PJ_SUCCESS);

    rc = pj_stun_session_send_msg(g.sess, PJ_FALSE, 
				  &g.srv_addr, sizeof(g.srv_addr),
				  tdata);
    if (rc != PJ_SUCCESS)