chan_gtalk.c

Asterisk中信道部分的源码 。。。。

	struct gtalk_candidate *tmp;
	struct hostent *hp;
	struct ast_hostent ahp;
	struct sockaddr_in sin;
	struct sockaddr_in aux;

	if (time(NULL) == p->laststun)
		return 0;

	tmp = p->theircandidates;
	p->laststun = time(NULL);
	while (tmp) {
		char username[256];

		/* Find the IP address of the host */
		hp = ast_gethostbyname(tmp->ip, &ahp);
		sin.sin_family = AF_INET;
		memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
		sin.sin_port = htons(tmp->port);
		snprintf(username, sizeof(username), "%s%s", tmp->username,
			 p->ourcandidates->username);
		
		/* Find out the result of the STUN */
		ast_rtp_get_peer(p->rtp, &aux);

		/* If the STUN result is different from the IP of the hostname,
			lock on the stun IP of the hostname advertised by the
			remote client */
		if (aux.sin_addr.s_addr && 
		    aux.sin_addr.s_addr != sin.sin_addr.s_addr)
			ast_rtp_stun_request(p->rtp, &aux, username);
		else 
			ast_rtp_stun_request(p->rtp, &sin, username);
		
		if (aux.sin_addr.s_addr && option_debug > 3) {
			ast_log(LOG_DEBUG, "Receiving RTP traffic from IP %s, matches with remote candidate's IP %s\n", ast_inet_ntoa(aux.sin_addr), tmp->ip);
			ast_log(LOG_DEBUG, "Sending STUN request to %s\n", tmp->ip);
		}

		tmp = tmp->next;
	}
	return 1;
}

static int gtalk_add_candidate(struct gtalk *client, ikspak *pak)
{
	struct gtalk_pvt *p = NULL, *tmp = NULL;
	struct aji_client *c = client->connection;
	struct gtalk_candidate *newcandidate = NULL;
	iks *traversenodes = NULL, *receipt = NULL;
	char *from;

	from = iks_find_attrib(pak->x,"to");
	if(!from)
		from = c->jid->full;

	for (tmp = client->p; tmp; tmp = tmp->next) {
		if (iks_find_with_attrib(pak->x, "session", "id", tmp->sid)) {
			p = tmp;
			break;
		}
	}

	if (!p)
		return -1;

	traversenodes = pak->query;
	while(traversenodes) {
		if(!strcasecmp(iks_name(traversenodes), "session")) {
			traversenodes = iks_child(traversenodes);
			continue;
		}
		if(!strcasecmp(iks_name(traversenodes), "transport")) {
			traversenodes = iks_child(traversenodes);
			continue;
		}
		if(!strcasecmp(iks_name(traversenodes), "candidate")) {
			newcandidate = ast_calloc(1, sizeof(*newcandidate));
			if (!newcandidate)
				return 0;
			ast_copy_string(newcandidate->name, iks_find_attrib(traversenodes, "name"),
							sizeof(newcandidate->name));
			ast_copy_string(newcandidate->ip, iks_find_attrib(traversenodes, "address"),
							sizeof(newcandidate->ip));
			newcandidate->port = atoi(iks_find_attrib(traversenodes, "port"));
			ast_copy_string(newcandidate->username, iks_find_attrib(traversenodes, "username"),
							sizeof(newcandidate->username));
			ast_copy_string(newcandidate->password, iks_find_attrib(traversenodes, "password"),
							sizeof(newcandidate->password));
			newcandidate->preference = atof(iks_find_attrib(traversenodes, "preference"));
			if (!strcasecmp(iks_find_attrib(traversenodes, "protocol"), "udp"))
				newcandidate->protocol = AJI_PROTOCOL_UDP;
			if (!strcasecmp(iks_find_attrib(traversenodes, "protocol"), "ssltcp"))
				newcandidate->protocol = AJI_PROTOCOL_SSLTCP;
		
			if (!strcasecmp(iks_find_attrib(traversenodes, "type"), "stun"))
				newcandidate->type = AJI_CONNECT_STUN;
			if (!strcasecmp(iks_find_attrib(traversenodes, "type"), "local"))
				newcandidate->type = AJI_CONNECT_LOCAL;
			if (!strcasecmp(iks_find_attrib(traversenodes, "type"), "relay"))
				newcandidate->type = AJI_CONNECT_RELAY;
			ast_copy_string(newcandidate->network, iks_find_attrib(traversenodes, "network"),
							sizeof(newcandidate->network));
			newcandidate->generation = atoi(iks_find_attrib(traversenodes, "generation"));
			newcandidate->next = NULL;
		
			newcandidate->next = p->theircandidates;
			p->theircandidates = newcandidate;
			p->laststun = 0;
			gtalk_update_stun(p->parent, p);
			newcandidate = NULL;
		}
		traversenodes = iks_next(traversenodes);
	}
	
	receipt = iks_new("iq");
	iks_insert_attrib(receipt, "type", "result");
	iks_insert_attrib(receipt, "from", from);
	iks_insert_attrib(receipt, "to", iks_find_attrib(pak->x, "from"));
	iks_insert_attrib(receipt, "id", iks_find_attrib(pak->x, "id"));
	iks_send(c->p, receipt);
	iks_delete(receipt);

	return 1;
}

static struct ast_frame *gtalk_rtp_read(struct ast_channel *ast, struct gtalk_pvt *p)
{
	struct ast_frame *f;

	if (!p->rtp)
		return &ast_null_frame;
	f = ast_rtp_read(p->rtp);
	gtalk_update_stun(p->parent, p);
	if (p->owner) {
		/* We already hold the channel lock */
		if (f->frametype == AST_FRAME_VOICE) {
			if (f->subclass != (p->owner->nativeformats & AST_FORMAT_AUDIO_MASK)) {
				if (option_debug)
					ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass);
				p->owner->nativeformats =
					(p->owner->nativeformats & AST_FORMAT_VIDEO_MASK) | f->subclass;
				ast_set_read_format(p->owner, p->owner->readformat);
				ast_set_write_format(p->owner, p->owner->writeformat);
			}
/*			if ((ast_test_flag(p, SIP_DTMF) == SIP_DTMF_INBAND) && p->vad) {
				f = ast_dsp_process(p->owner, p->vad, f);
				if (option_debug && f && (f->frametype == AST_FRAME_DTMF))
					ast_log(LOG_DEBUG, "* Detected inband DTMF '%c'\n", f->subclass);
		        } */
		}
	}
	return f;
}

static struct ast_frame *gtalk_read(struct ast_channel *ast)
{
	struct ast_frame *fr;
	struct gtalk_pvt *p = ast->tech_pvt;

	ast_mutex_lock(&p->lock);
	fr = gtalk_rtp_read(ast, p);
	ast_mutex_unlock(&p->lock);
	return fr;
}

/*! \brief Send frame to media channel (rtp) */
static int gtalk_write(struct ast_channel *ast, struct ast_frame *frame)
{
	struct gtalk_pvt *p = ast->tech_pvt;
	int res = 0;

	switch (frame->frametype) {
	case AST_FRAME_VOICE:
		if (!(frame->subclass & ast->nativeformats)) {
			ast_log(LOG_WARNING,
					"Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
					frame->subclass, ast->nativeformats, ast->readformat,
					ast->writeformat);
			return 0;
		}
		if (p) {
			ast_mutex_lock(&p->lock);
			if (p->rtp) {
				res = ast_rtp_write(p->rtp, frame);
			}
			ast_mutex_unlock(&p->lock);
		}
		break;
	case AST_FRAME_VIDEO:
		if (p) {
			ast_mutex_lock(&p->lock);
			if (p->vrtp) {
				res = ast_rtp_write(p->vrtp, frame);
			}
			ast_mutex_unlock(&p->lock);
		}
		break;
	case AST_FRAME_IMAGE:
		return 0;
		break;
	default:
		ast_log(LOG_WARNING, "Can't send %d type frames with Gtalk write\n",
				frame->frametype);
		return 0;
	}

	return res;
}

static int gtalk_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
{
	struct gtalk_pvt *p = newchan->tech_pvt;
	ast_mutex_lock(&p->lock);

	if ((p->owner != oldchan)) {
		ast_mutex_unlock(&p->lock);
		return -1;
	}
	if (p->owner == oldchan)
		p->owner = newchan;
	ast_mutex_unlock(&p->lock);
	return 0;
}

static int gtalk_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen)
{
	int res = 0;

	switch (condition) {
	case AST_CONTROL_HOLD:
		ast_moh_start(ast, data, NULL);
		break;
	case AST_CONTROL_UNHOLD:
		ast_moh_stop(ast);
		break;
	default:
		ast_log(LOG_NOTICE, "Don't know how to indicate condition '%d'\n", condition);
		res = -1;
	}

	return res;
}

static int gtalk_digit_begin(struct ast_channel *chan, char digit)
{
	return gtalk_digit(chan, digit, 0);
}

static int gtalk_digit_end(struct ast_channel *chan, char digit, unsigned int duration)
{
	return gtalk_digit(chan, digit, duration);
}

static int gtalk_digit(struct ast_channel *ast, char digit, unsigned int duration)
{
	struct gtalk_pvt *p = ast->tech_pvt;
	struct gtalk *client = p->parent;
	iks *iq, *gtalk, *dtmf;
	char buffer[2] = {digit, '\0'};
	iq = iks_new("iq");
	gtalk = iks_new("gtalk");
	dtmf = iks_new("dtmf");
	if(!iq || !gtalk || !dtmf) {
		if(iq)
			iks_delete(iq);
		if(gtalk)
			iks_delete(gtalk);
		if(dtmf)
			iks_delete(dtmf);
		ast_log(LOG_ERROR, "Did not send dtmf do to memory issue\n");
		return -1;
	}

	iks_insert_attrib(iq, "type", "set");
	iks_insert_attrib(iq, "to", p->them);
	iks_insert_attrib(iq, "from", p->us);
	iks_insert_attrib(iq, "id", client->connection->mid);
	ast_aji_increment_mid(client->connection->mid);
	iks_insert_attrib(gtalk, "xmlns", "http://jabber.org/protocol/gtalk");
	iks_insert_attrib(gtalk, "action", "session-info");
	iks_insert_attrib(gtalk, "initiator", p->initiator ? p->us: p->them);
	iks_insert_attrib(gtalk, "sid", p->sid);
	iks_insert_attrib(dtmf, "xmlns", "http://jabber.org/protocol/gtalk/info/dtmf");
	iks_insert_attrib(dtmf, "code", buffer);
	iks_insert_node(iq, gtalk);
	iks_insert_node(gtalk, dtmf);

	ast_mutex_lock(&p->lock);
	if (ast->dtmff.frametype == AST_FRAME_DTMF_BEGIN || duration == 0) {
		iks_insert_attrib(dtmf, "action", "button-down");
	} else if (ast->dtmff.frametype == AST_FRAME_DTMF_END || duration != 0) {
		iks_insert_attrib(dtmf, "action", "button-up");
	}
	iks_send(client->connection->p, iq);
	iks_delete(iq);
	iks_delete(gtalk);
	iks_delete(dtmf);
	ast_mutex_unlock(&p->lock);
	return 0;
}

static int gtalk_sendhtml(struct ast_channel *ast, int subclass, const char *data, int datalen)
{
	ast_log(LOG_NOTICE, "XXX Implement gtalk sendhtml XXX\n");

	return -1;
}

/* Not in use right now.
static int gtalk_auto_congest(void *nothing)
{
	struct gtalk_pvt *p = nothing;

	ast_mutex_lock(&p->lock);
	if (p->owner) {
		if (!ast_channel_trylock(p->owner)) {
			ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name);
			ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
			ast_channel_unlock(p->owner);
		}
	}
	ast_mutex_unlock(&p->lock);
	return 0;
}
*/

/*! \brief Initiate new call, part of PBX interface 
 * 	dest is the dial string */
static int gtalk_call(struct ast_channel *ast, char *dest, int timeout)
{
	struct gtalk_pvt *p = ast->tech_pvt;

	if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
		ast_log(LOG_WARNING, "gtalk_call called on %s, neither down nor reserved\n", ast->name);
		return -1;
	}

	ast_setstate(ast, AST_STATE_RING);
	if (!p->ringrule) {
		ast_copy_string(p->ring, p->parent->connection->mid, sizeof(p->ring));
		p->ringrule = iks_filter_add_rule(p->parent->connection->f, gtalk_ringing_ack, p,
							IKS_RULE_ID, p->ring, IKS_RULE_DONE);
	} else
		ast_log(LOG_WARNING, "Whoa, already have a ring rule!\n");

	gtalk_invite(p, p->them, p->us, p->sid, 1);
	gtalk_create_candidates(p->parent, p, p->sid, p->them, p->us);

	return 0;
}

/*! \brief Hangup a call through the gtalk proxy channel */
static int gtalk_hangup(struct ast_channel *ast)
{
	struct gtalk_pvt *p = ast->tech_pvt;
	struct gtalk *client;

	ast_mutex_lock(&p->lock);
	client = p->parent;
	p->owner = NULL;
	ast->tech_pvt = NULL;
	if (!p->alreadygone)
		gtalk_action(client, p, "terminate");
	ast_mutex_unlock(&p->lock);

	gtalk_free_pvt(client, p);
	ast_module_unref(ast_module_info->self);

	return 0;
}

/*! \brief Part of PBX interface */
static struct ast_channel *gtalk_request(const char *type, int format, void *data, int *cause)
{
	struct gtalk_pvt *p = NULL;
	struct gtalk *client = NULL;
	char *sender = NULL, *to = NULL, *s = NULL;
	struct ast_channel *chan = NULL;

	if (data) {
		s = ast_strdupa(data);
		if (s) {
			sender = strsep(&s, "/");
			if (sender && (sender[0] != '\0'))
				to = strsep(&s, "/");
			if (!to) {
				ast_log(LOG_ERROR, "Bad arguments in Gtalk Dialstring: %s\n", (char*) data);
				return NULL;
			}
		}
	}

	client = find_gtalk(to, sender);
	if (!client) {
		ast_log(LOG_WARNING, "Could not find recipient.\n");
		return NULL;
	}
	if (!strcasecmp(client->name, "guest")){
		/* the guest account is not tied to any configured XMPP client,
		   let's set it now */
		client->connection = ast_aji_get_client(sender);
		if (!client->connection) {
			ast_log(LOG_ERROR, "No XMPP client to talk to, us (partial JID) : %s\n", sender);
			ASTOBJ_UNREF(client, gtalk_member_destroy);
			return NULL;
		}
	}

	ASTOBJ_WRLOCK(client);
	p = gtalk_alloc(client, strchr(sender, '@') ? sender : client->connection->jid->full, strchr(to, '@') ? to : client->user, NULL);
	if (p)
		chan = gtalk_new(client, p, AST_STATE_DOWN, to);