pjsua_core.c

基于sip协议的网络电话源码

    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);


    /* Initialize UA layer module: */
    status = pjsip_ua_init_module( pjsua_var.endpt, NULL );
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);


    /* Initialize Replaces support. */
    status = pjsip_replaces_init_module( pjsua_var.endpt );
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);


    /* Initialize and register PJSUA application module. */
    {
	const pjsip_module mod_initializer = 
	{
	NULL, NULL,		    /* prev, next.			*/
	{ "mod-pjsua", 9 },	    /* Name.				*/
	-1,			    /* Id				*/
	PJSIP_MOD_PRIORITY_APPLICATION,	/* Priority			*/
	NULL,			    /* load()				*/
	NULL,			    /* start()				*/
	NULL,			    /* stop()				*/
	NULL,			    /* unload()				*/
	&mod_pjsua_on_rx_request,   /* on_rx_request()			*/
	&mod_pjsua_on_rx_response,  /* on_rx_response()			*/
	NULL,			    /* on_tx_request.			*/
	NULL,			    /* on_tx_response()			*/
	NULL,			    /* on_tsx_state()			*/
	};

	pjsua_var.mod = mod_initializer;

	status = pjsip_endpt_register_module(pjsua_var.endpt, &pjsua_var.mod);
	PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
    }

    

    /* Initialize PJSUA call subsystem: */
    status = pjsua_call_subsys_init(ua_cfg);
    if (status != PJ_SUCCESS)
	goto on_error;


    /* Initialize PJSUA media subsystem */
    status = pjsua_media_subsys_init(media_cfg);
    if (status != PJ_SUCCESS)
	goto on_error;


    /* Init core SIMPLE module : */
    status = pjsip_evsub_init_module(pjsua_var.endpt);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);


    /* Init presence module: */
    status = pjsip_pres_init_module( pjsua_var.endpt, pjsip_evsub_instance());
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);

    /* Init PUBLISH module */
    pjsip_publishc_init_module(pjsua_var.endpt);

    /* Init xfer/REFER module */
    status = pjsip_xfer_init_module( pjsua_var.endpt );
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);

    /* Init pjsua presence handler: */
    status = pjsua_pres_init();
    if (status != PJ_SUCCESS)
	goto on_error;

    /* Init out-of-dialog MESSAGE request handler. */
    status = pjsua_im_init();
    if (status != PJ_SUCCESS)
	goto on_error;

    /* Register OPTIONS handler */
    pjsip_endpt_register_module(pjsua_var.endpt, &pjsua_options_handler);

    /* Add OPTIONS in Allow header */
    pjsip_endpt_add_capability(pjsua_var.endpt, NULL, PJSIP_H_ALLOW,
			       NULL, 1, &STR_OPTIONS);

    /* Start worker thread if needed. */
    if (pjsua_var.ua_cfg.thread_cnt) {
	unsigned i;

	if (pjsua_var.ua_cfg.thread_cnt > PJ_ARRAY_SIZE(pjsua_var.thread))
	    pjsua_var.ua_cfg.thread_cnt = PJ_ARRAY_SIZE(pjsua_var.thread);

	for (i=0; i<pjsua_var.ua_cfg.thread_cnt; ++i) {
	    status = pj_thread_create(pjsua_var.pool, "pjsua", &worker_thread,
				      NULL, 0, 0, &pjsua_var.thread[i]);
	    if (status != PJ_SUCCESS)
		goto on_error;
	}
	PJ_LOG(4,(THIS_FILE, "%d SIP worker threads created", 
		  pjsua_var.ua_cfg.thread_cnt));
    } else {
	PJ_LOG(4,(THIS_FILE, "No SIP worker threads created"));
    }

    /* Done! */

    PJ_LOG(3,(THIS_FILE, "pjsua version %s for %s initialized", 
			 PJ_VERSION, PJ_OS_NAME));

    return PJ_SUCCESS;

on_error:
    pjsua_destroy();
    return status;
}


/* Sleep with polling */
static void busy_sleep(unsigned msec)
{
    pj_time_val timeout, now;

    pj_gettimeofday(&timeout);
    timeout.msec += msec;
    pj_time_val_normalize(&timeout);

    do {
	while (pjsua_handle_events(10) > 0)
	    ;
	pj_gettimeofday(&now);
    } while (PJ_TIME_VAL_LT(now, timeout));
}

/*
 * Destroy pjsua.
 */
PJ_DEF(pj_status_t) pjsua_destroy(void)
{
    int i;  /* Must be signed */

    /* Signal threads to quit: */
    pjsua_var.thread_quit_flag = 1;

    /* Wait worker threads to quit: */
    for (i=0; i<(int)pjsua_var.ua_cfg.thread_cnt; ++i) {
	if (pjsua_var.thread[i]) {
	    pj_thread_join(pjsua_var.thread[i]);
	    pj_thread_destroy(pjsua_var.thread[i]);
	    pjsua_var.thread[i] = NULL;
	}
    }
    
    if (pjsua_var.endpt) {
	/* Terminate all calls. */
	pjsua_call_hangup_all();

	/* Terminate all presence subscriptions. */
	pjsua_pres_shutdown();

	/* Unregister, if required: */
	for (i=0; i<(int)PJ_ARRAY_SIZE(pjsua_var.acc); ++i) {
	    if (!pjsua_var.acc[i].valid)
		continue;

	    if (pjsua_var.acc[i].regc) {
		pjsua_acc_set_registration(i, PJ_FALSE);
	    }
	}

	/* Wait for some time to allow unregistration to complete: */
	PJ_LOG(4,(THIS_FILE, "Shutting down..."));
	busy_sleep(1000);
    }

    /* Destroy media */
    pjsua_media_subsys_destroy();

    /* Destroy endpoint. */
    if (pjsua_var.endpt) {
	pjsip_endpt_destroy(pjsua_var.endpt);
	pjsua_var.endpt = NULL;
    }

    /* Destroy mutex */
    if (pjsua_var.mutex) {
	pj_mutex_destroy(pjsua_var.mutex);
	pjsua_var.mutex = NULL;
    }

    /* Destroy pool and pool factory. */
    if (pjsua_var.pool) {
	pj_pool_release(pjsua_var.pool);
	pjsua_var.pool = NULL;
	pj_caching_pool_destroy(&pjsua_var.cp);

	PJ_LOG(4,(THIS_FILE, "PJSUA destroyed..."));

	/* End logging */
	if (pjsua_var.log_file) {
	    pj_file_close(pjsua_var.log_file);
	    pjsua_var.log_file = NULL;
	}

	/* Shutdown PJLIB */
	pj_shutdown();
    }

    /* Clear pjsua_var */
    pj_bzero(&pjsua_var, sizeof(pjsua_var));

    /* Done. */
    return PJ_SUCCESS;
}


/**
 * Application is recommended to call this function after all initialization
 * is done, so that the library can do additional checking set up
 * additional 
 *
 * @return		PJ_SUCCESS on success, or the appropriate error code.
 */
PJ_DEF(pj_status_t) pjsua_start(void)
{
    pj_status_t status;

    status = pjsua_call_subsys_start();
    if (status != PJ_SUCCESS)
	return status;

    status = pjsua_media_subsys_start();
    if (status != PJ_SUCCESS)
	return status;

    status = pjsua_pres_start();
    if (status != PJ_SUCCESS)
	return status;

    return PJ_SUCCESS;
}


/**
 * Poll pjsua for events, and if necessary block the caller thread for
 * the specified maximum interval (in miliseconds).
 */
PJ_DEF(int) pjsua_handle_events(unsigned msec_timeout)
{
    unsigned count = 0;
    pj_time_val tv;
    pj_status_t status;

    tv.sec = 0;
    tv.msec = msec_timeout;
    pj_time_val_normalize(&tv);

    status = pjsip_endpt_handle_events2(pjsua_var.endpt, &tv, &count);

    if (status != PJ_SUCCESS)
	return -status;

    return count;
}


/*
 * Create memory pool.
 */
PJ_DEF(pj_pool_t*) pjsua_pool_create( const char *name, pj_size_t init_size,
				      pj_size_t increment)
{
    /* Pool factory is thread safe, no need to lock */
    return pj_pool_create(&pjsua_var.cp.factory, name, init_size, increment, 
			  NULL);
}


/*
 * Internal function to get SIP endpoint instance of pjsua, which is
 * needed for example to register module, create transports, etc.
 * Probably is only valid after #pjsua_init() is called.
 */
PJ_DEF(pjsip_endpoint*) pjsua_get_pjsip_endpt(void)
{
    return pjsua_var.endpt;
}

/*
 * Internal function to get media endpoint instance.
 * Only valid after #pjsua_init() is called.
 */
PJ_DEF(pjmedia_endpt*) pjsua_get_pjmedia_endpt(void)
{
    return pjsua_var.med_endpt;
}

/*
 * Internal function to get PJSUA pool factory.
 */
PJ_DEF(pj_pool_factory*) pjsua_get_pool_factory(void)
{
    return &pjsua_var.cp.factory;
}

/*****************************************************************************
 * PJSUA SIP Transport API.
 */

/*
 * Create and initialize SIP socket (and possibly resolve public
 * address via STUN, depending on config).
 */
static pj_status_t create_sip_udp_sock(pj_in_addr bound_addr,
				       int port,
				       pj_bool_t use_stun,
				       const pjsua_stun_config *stun_param,
				       pj_sock_t *p_sock,
				       pj_sockaddr_in *p_pub_addr)
{
    pjsua_stun_config stun;
    pj_sock_t sock;
    pj_status_t status;

    status = pj_sock_socket(PJ_AF_INET, PJ_SOCK_DGRAM, 0, &sock);
    if (status != PJ_SUCCESS) {
	pjsua_perror(THIS_FILE, "socket() error", status);
	return status;
    }

    status = pj_sock_bind_in(sock, pj_ntohl(bound_addr.s_addr), 
			     (pj_uint16_t)port);
    if (status != PJ_SUCCESS) {
	pjsua_perror(THIS_FILE, "bind() error", status);
	pj_sock_close(sock);
	return status;
    }

    /* If port is zero, get the bound port */
    if (port == 0) {
	pj_sockaddr_in bound_addr;
	int namelen = sizeof(bound_addr);
	status = pj_sock_getsockname(sock, &bound_addr, &namelen);
	if (status != PJ_SUCCESS) {
	    pjsua_perror(THIS_FILE, "getsockname() error", status);
	    pj_sock_close(sock);
	    return status;
	}

	port = pj_ntohs(bound_addr.sin_port);
    }

    /* Copy and normalize STUN param */
    if (use_stun) {
	pj_memcpy(&stun, stun_param, sizeof(*stun_param));
	pjsua_normalize_stun_config(&stun);
    } else {
	pj_bzero(&stun, sizeof(pjsua_stun_config));
    }

    /* Get the published address, either by STUN or by resolving
     * the name of local host.
     */
    if (stun.stun_srv1.slen) {
	/*
	 * STUN is specified, resolve the address with STUN.
	 */
	status = pj_stun_get_mapped_addr(&pjsua_var.cp.factory, 1, &sock,
				         &stun.stun_srv1, 
					  stun.stun_port1,
					 &stun.stun_srv2, 
					  stun.stun_port2,
				          p_pub_addr);
	if (status != PJ_SUCCESS) {
	    pjsua_perror(THIS_FILE, "Error resolving with STUN", status);
	    pj_sock_close(sock);
	    return status;
	}

    } else if (p_pub_addr->sin_addr.s_addr != 0) {
	/*
	 * Public address is already specified, no need to resolve the 
	 * address, only set the port.
	 */
	if (p_pub_addr->sin_port == 0)
	    p_pub_addr->sin_port = pj_htons((pj_uint16_t)port);

    } else {

	pj_bzero(p_pub_addr, sizeof(pj_sockaddr_in));

	status = pj_gethostip(&p_pub_addr->sin_addr);
	if (status != PJ_SUCCESS) {
	    pjsua_perror(THIS_FILE, "Unable to get local host IP", status);
	    pj_sock_close(sock);
	    return status;
	}

	p_pub_addr->sin_family = PJ_AF_INET;
	p_pub_addr->sin_port = pj_htons((pj_uint16_t)port);
    }

    *p_sock = sock;

    PJ_LOG(4,(THIS_FILE, "SIP UDP socket reachable at %s:%d",
	      pj_inet_ntoa(p_pub_addr->sin_addr),
	      (int)pj_ntohs(p_pub_addr->sin_port)));

    return PJ_SUCCESS;
}


/*
 * Create SIP transport.
 */
PJ_DEF(pj_status_t) pjsua_transport_create( pjsip_transport_type_e type,
					    const pjsua_transport_config *cfg,
					    pjsua_transport_id *p_id)
{
    pjsip_transport *tp;
    unsigned id;
    pj_status_t status;

    PJSUA_LOCK();

    /* Find empty transport slot */
    for (id=0; id < PJ_ARRAY_SIZE(pjsua_var.tpdata); ++id) {
	if (pjsua_var.tpdata[id].data.ptr == NULL)
	    break;
    }

    if (id == PJ_ARRAY_SIZE(pjsua_var.tpdata)) {
	status = PJ_ETOOMANY;
	pjsua_perror(THIS_FILE, "Error creating transport", status);
	goto on_return;
    }

    /* Create the transport */
    if (type == PJSIP_TRANSPORT_UDP) {
	/*
	 * Create UDP transport.
	 */
	pjsua_transport_config config;
	pj_sock_t sock = PJ_INVALID_SOCKET;
	pj_sockaddr_in bound_addr;
	pj_sockaddr_in pub_addr;
	pjsip_host_port addr_name;

	/* Supply default config if it's not specified */
	if (cfg == NULL) {
	    pjsua_transport_config_default(&config);
	    cfg = &config;
	}

	/* Initialize bound address, if any */
	bound_addr.sin_addr.s_addr = PJ_INADDR_ANY;
	if (cfg->bound_addr.slen) {
	    status = pj_sockaddr_in_set_str_addr(&bound_addr,&cfg->bound_addr);
	    if (status != PJ_SUCCESS) {
		pjsua_perror(THIS_FILE, 
			     "Unable to resolve transport bound address", 
			     status);
		goto on_return;
	    }
	}

	/* Initialize the public address from the config, if any */
	pj_sockaddr_in_init(&pub_addr, NULL, (pj_uint16_t)cfg->port);
	if (cfg->public_addr.slen) {
	    status = pj_sockaddr_in_set_str_addr(&pub_addr, &cfg->public_addr);
	    if (status != PJ_SUCCESS) {
		pjsua_perror(THIS_FILE, 
			     "Unable to resolve transport public address", 
			     status);
		goto on_return;
	    }
	}

	/* Create the socket and possibly resolve the address with STUN 
	 * (only when public address is not specified).
	 */
	status = create_sip_udp_sock(bound_addr.sin_addr, cfg->port, 
				     cfg->use_stun, &cfg->stun_config, 
				     &sock, &pub_addr);
	if (status != PJ_SUCCESS)
	    goto on_return;

	addr_name.host = pj_str(pj_inet_ntoa(pub_addr.sin_addr));
	addr_name.port = pj_ntohs(pub_addr.sin_port);

	/* Create UDP transport */
	status = pjsip_udp_transport_attach( pjsua_var.endpt, sock,
					     &addr_name, 1, 
					     &tp);
	if (status != PJ_SUCCESS) {
	    pjsua_perror(THIS_FILE, "Error creating SIP UDP transport", 
			 status);
	    pj_sock_close(sock);
	    goto on_return;
	}


	/* Save the transport */
	pjsua_var.tpdata[id].type = type;
	pjsua_var.tpdata[id].local_name = tp->local_name;
	pjsua_var.tpdata[id].data.tp = tp;

#if defined(PJ_HAS_TCP) && PJ_HAS_TCP!=0