sal_eXosip2.c 77 KB
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/*
linphone
Copyright (C) 2010  Simon MORLAT (simon.morlat@free.fr)

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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "sal_eXosip2.h"
#include "offeranswer.h"

#ifdef ANDROID
// Necessary to make it linked
static void for_linker() { eXosip_transport_hook_register(NULL); }
#endif
static bool_t call_failure(Sal *sal, eXosip_event_t *ev);

static void text_received(Sal *sal, eXosip_event_t *ev);

static void masquerade_via(osip_message_t *msg, const char *ip, const char *port);
static bool_t fix_message_contact(SalOp *op, osip_message_t *request,osip_message_t *last_answer, bool_t expire_last_contact);
static void update_contact_from_response(SalOp *op, osip_message_t *response);


void _osip_list_set_empty(osip_list_t *l, void (*freefunc)(void*)){
	void *data;
	while(!osip_list_eol(l,0)) {
		data=osip_list_get(l,0);
		osip_list_remove(l,0);
		if (data) freefunc(data);
	}
}

void sal_get_default_local_ip(Sal *sal, int address_family,char *ip, size_t iplen){
	if (eXosip_guess_localip(address_family,ip,iplen)<0){
		/*default to something */
		strncpy(ip,address_family==AF_INET6 ? "::1" : "127.0.0.1",iplen);
		ms_error("Could not find default routable ip address !");
	}
}

static SalOp * sal_find_call(Sal *sal, int cid){
	const MSList *elem;
	SalOp *op;
	for(elem=sal->calls;elem!=NULL;elem=elem->next){
		op=(SalOp*)elem->data;
		if (op->cid==cid) return op;
	}
	return NULL;
}

static void sal_add_call(Sal *sal, SalOp *op){
	sal->calls=ms_list_append(sal->calls,op);
}

static void sal_remove_call(Sal *sal, SalOp *op){
	sal->calls=ms_list_remove(sal->calls, op);
}

static SalOp * sal_find_register(Sal *sal, int rid){
	const MSList *elem;
	SalOp *op;
	for(elem=sal->registers;elem!=NULL;elem=elem->next){
		op=(SalOp*)elem->data;
		if (op->rid==rid) return op;
	}
	return NULL;
}

static void sal_add_register(Sal *sal, SalOp *op){
	sal->registers=ms_list_append(sal->registers,op);
}

static void sal_remove_register(Sal *sal, int rid){
	MSList *elem;
	SalOp *op;
	for(elem=sal->registers;elem!=NULL;elem=elem->next){
		op=(SalOp*)elem->data;
		if (op->rid==rid) {
			sal->registers=ms_list_remove_link(sal->registers,elem);
			return;
		}
	}
}

static SalOp * sal_find_other(Sal *sal, osip_message_t *message){
	const MSList *elem;
	SalOp *op;
	osip_call_id_t *callid=osip_message_get_call_id(message);
	if (callid==NULL) {
		ms_error("There is no call-id in this message !");
		return NULL;
	}
	for(elem=sal->other_transactions;elem!=NULL;elem=elem->next){
		op=(SalOp*)elem->data;
		if (osip_call_id_match(callid,op->call_id)==0) return op;
	}
	return NULL;
}

void sal_add_other(Sal *sal, SalOp *op, osip_message_t *request){
	osip_call_id_t *callid=osip_message_get_call_id(request);
	if (callid==NULL) {
		ms_error("There is no call id in the request !");
		return;
	}
	osip_call_id_clone(callid,&op->call_id);
	sal->other_transactions=ms_list_append(sal->other_transactions,op);
}

static void sal_remove_other(Sal *sal, SalOp *op){
	sal->other_transactions=ms_list_remove(sal->other_transactions,op);
}


static void sal_add_pending_auth(Sal *sal, SalOp *op){
	sal->pending_auths=ms_list_append(sal->pending_auths,op);
}


static void sal_remove_pending_auth(Sal *sal, SalOp *op){
	sal->pending_auths=ms_list_remove(sal->pending_auths,op);
}

void sal_exosip_fix_route(SalOp *op){
	if (sal_op_get_route(op)!=NULL){
		osip_route_t *rt=NULL;
		osip_uri_param_t *lr_param=NULL;
		
		osip_route_init(&rt);
		if (osip_route_parse(rt,sal_op_get_route(op))<0){
			ms_warning("Bad route  %s!",sal_op_get_route(op));
			sal_op_set_route(op,NULL);
		}else{
			/* check if the lr parameter is set , if not add it */
			osip_uri_uparam_get_byname(rt->url, "lr", &lr_param);
		  	if (lr_param==NULL){
				char *tmproute;
				osip_uri_uparam_add(rt->url,osip_strdup("lr"),NULL);
				osip_route_to_str(rt,&tmproute);
				sal_op_set_route(op,tmproute);
				osip_free(tmproute);
			}
		}
		osip_route_free(rt);
	}
}

SalOp * sal_op_new(Sal *sal){
	SalOp *op=ms_new0(SalOp,1);
	__sal_op_init(op,sal);
	op->cid=op->did=op->tid=op->rid=op->nid=op->sid=-1;
	op->result=NULL;
	op->supports_session_timers=FALSE;
	op->sdp_offering=TRUE;
	op->pending_auth=NULL;
	op->sdp_answer=NULL;
	op->reinvite=FALSE;
	op->call_id=NULL;
	op->replaces=NULL;
	op->referred_by=NULL;
	op->masquerade_via=FALSE;
	op->auto_answer_asked=FALSE;
	op->auth_info=NULL;
	op->terminated=FALSE;
	return op;
}

bool_t sal_call_autoanswer_asked(SalOp *op)
{
	return op->auto_answer_asked;
}

void sal_op_release(SalOp *op){
	if (op->sdp_answer)
		sdp_message_free(op->sdp_answer);
	if (op->pending_auth)
		eXosip_event_free(op->pending_auth);
	if (op->rid!=-1){
		sal_remove_register(op->base.root,op->rid);
		eXosip_register_remove(op->rid);
	}
	if (op->cid!=-1){
		ms_message("Cleaning cid %i",op->cid);
		sal_remove_call(op->base.root,op);
	}
	if (op->sid!=-1){
		sal_remove_out_subscribe(op->base.root,op);
	}
	if (op->nid!=-1){
		sal_remove_in_subscribe(op->base.root,op);
		if (op->call_id)
			osip_call_id_free(op->call_id);
		op->call_id=NULL;
	}
	if (op->pending_auth){
		sal_remove_pending_auth(op->base.root,op);
	}
	if (op->result)
		sal_media_description_unref(op->result);
	if (op->call_id){
		sal_remove_other(op->base.root,op);
		osip_call_id_free(op->call_id);
	}
	if (op->replaces){
		ms_free(op->replaces);
	}
	if (op->referred_by){
		ms_free(op->referred_by);
	}
	if (op->auth_info) {
		sal_auth_info_delete(op->auth_info);
	}
	__sal_op_free(op);
}

static void _osip_trace_func(char *fi, int li, osip_trace_level_t level, char *chfr, va_list ap){
	int ortp_level=ORTP_DEBUG;
	switch(level){
		case OSIP_INFO1:
		case OSIP_INFO2:
		case OSIP_INFO3:
		case OSIP_INFO4:
			ortp_level=ORTP_MESSAGE;
			break;
		case OSIP_WARNING:
			ortp_level=ORTP_WARNING;
			break;
		case OSIP_ERROR:
		case OSIP_BUG:
			ortp_level=ORTP_ERROR;
			break;
		case OSIP_FATAL:
			ortp_level=ORTP_FATAL;
			break;
		case END_TRACE_LEVEL:
			break;
	}
	if (ortp_log_level_enabled(level)){
		int len=strlen(chfr);
		char *chfrdup=ortp_strdup(chfr);
		/*need to remove endline*/
		if (len>1){
			if (chfrdup[len-1]=='\n')
				chfrdup[len-1]='\0';
			if (chfrdup[len-2]=='\r')
				chfrdup[len-2]='\0';
		}
		ortp_logv(ortp_level,chfrdup,ap);
		ortp_free(chfrdup);
	}
}


Sal * sal_init(){
	static bool_t firsttime=TRUE;
	Sal *sal;
	if (firsttime){
		osip_trace_initialize_func (OSIP_INFO4,&_osip_trace_func);
		firsttime=FALSE;
	}
	eXosip_init();
	sal=ms_new0(Sal,1);
	sal->keepalive_period=30;
	sal->double_reg=TRUE;
	sal->use_rports=TRUE;
	sal->use_101=TRUE;
	sal->reuse_authorization=FALSE;
	sal->rootCa = 0;
	sal->verify_server_certs=TRUE;
	sal->verify_server_cn=TRUE;
	sal->expire_old_contact=FALSE;
	sal->add_dates=FALSE;
	sal->dscp=-1;
	return sal;
}

void sal_uninit(Sal* sal){
	eXosip_quit();
	if (sal->rootCa)
		ms_free(sal->rootCa);
	ms_free(sal);
}

void sal_set_user_pointer(Sal *sal, void *user_data){
	sal->up=user_data;
}

void *sal_get_user_pointer(const Sal *sal){
	return sal->up;
}

static void unimplemented_stub(){
	ms_warning("Unimplemented SAL callback");
}

void sal_set_callbacks(Sal *ctx, const SalCallbacks *cbs){
	memcpy(&ctx->callbacks,cbs,sizeof(*cbs));
	if (ctx->callbacks.call_received==NULL) 
		ctx->callbacks.call_received=(SalOnCallReceived)unimplemented_stub;
	if (ctx->callbacks.call_ringing==NULL) 
		ctx->callbacks.call_ringing=(SalOnCallRinging)unimplemented_stub;
	if (ctx->callbacks.call_accepted==NULL) 
		ctx->callbacks.call_accepted=(SalOnCallAccepted)unimplemented_stub;
	if (ctx->callbacks.call_failure==NULL) 
		ctx->callbacks.call_failure=(SalOnCallFailure)unimplemented_stub;
	if (ctx->callbacks.call_terminated==NULL) 
		ctx->callbacks.call_terminated=(SalOnCallTerminated)unimplemented_stub;
	if (ctx->callbacks.call_released==NULL)
		ctx->callbacks.call_released=(SalOnCallReleased)unimplemented_stub;
	if (ctx->callbacks.call_updating==NULL) 
		ctx->callbacks.call_updating=(SalOnCallUpdating)unimplemented_stub;
	if (ctx->callbacks.auth_requested==NULL) 
		ctx->callbacks.auth_requested=(SalOnAuthRequested)unimplemented_stub;
	if (ctx->callbacks.auth_success==NULL) 
		ctx->callbacks.auth_success=(SalOnAuthSuccess)unimplemented_stub;
	if (ctx->callbacks.register_success==NULL) 
		ctx->callbacks.register_success=(SalOnRegisterSuccess)unimplemented_stub;
	if (ctx->callbacks.register_failure==NULL) 
		ctx->callbacks.register_failure=(SalOnRegisterFailure)unimplemented_stub;
	if (ctx->callbacks.dtmf_received==NULL) 
		ctx->callbacks.dtmf_received=(SalOnDtmfReceived)unimplemented_stub;
	if (ctx->callbacks.notify==NULL)
		ctx->callbacks.notify=(SalOnNotify)unimplemented_stub;
	if (ctx->callbacks.notify_presence==NULL)
		ctx->callbacks.notify_presence=(SalOnNotifyPresence)unimplemented_stub;
	if (ctx->callbacks.subscribe_received==NULL)
		ctx->callbacks.subscribe_received=(SalOnSubscribeReceived)unimplemented_stub;
	if (ctx->callbacks.text_received==NULL)
		ctx->callbacks.text_received=(SalOnTextReceived)unimplemented_stub;
	if (ctx->callbacks.ping_reply==NULL)
		ctx->callbacks.ping_reply=(SalOnPingReply)unimplemented_stub;
}

int sal_unlisten_ports(Sal *ctx){
	if (ctx->running){
		eXosip_quit();
		eXosip_init();
		ctx->running=FALSE;
	}
	return 0;
}

int sal_reset_transports(Sal *ctx){
#ifdef HAVE_EXOSIP_RESET_TRANSPORTS
	if (ctx->running){
		ms_message("Exosip transports reset.");
		eXosip_reset_transports();
	}
	return 0;
#else
	ms_warning("sal_reset_transports() not implemented in this version.");
	return -1;
#endif
}


static void set_tls_options(Sal *ctx){
	if (ctx->rootCa) {
		eXosip_tls_ctx_t tlsCtx;
		memset(&tlsCtx, 0, sizeof(tlsCtx));
		snprintf(tlsCtx.root_ca_cert, sizeof(tlsCtx.client.cert), "%s", ctx->rootCa);
		eXosip_set_tls_ctx(&tlsCtx);
	}                       
#ifdef HAVE_EXOSIP_TLS_VERIFY_CERTIFICATE
	eXosip_tls_verify_certificate(ctx->verify_server_certs);
#endif
#ifdef HAVE_EXOSIP_TLS_VERIFY_CN
	eXosip_tls_verify_cn(ctx->verify_server_cn);
#endif
}

void sal_set_dscp(Sal *ctx, int dscp){
	ctx->dscp=dscp;
#ifdef HAVE_EXOSIP_DSCP
	if (dscp!=-1)
		eXosip_set_option(EXOSIP_OPT_SET_DSCP,&ctx->dscp);
#endif
}

int sal_listen_port(Sal *ctx, const char *addr, int port, SalTransport tr, int is_secure){
	int err;
	bool_t ipv6;
	int proto=IPPROTO_UDP;
	int keepalive = ctx->keepalive_period;

	ctx->transport = tr;
	switch (tr) {
	case SalTransportUDP:
		proto=IPPROTO_UDP;
		eXosip_set_option (EXOSIP_OPT_UDP_KEEP_ALIVE, &keepalive);
		break;
	case SalTransportTCP:
	case SalTransportTLS:
		proto= IPPROTO_TCP;
		if (!ctx->tcp_tls_keepalive) keepalive=-1;
		eXosip_set_option (EXOSIP_OPT_UDP_KEEP_ALIVE,&keepalive);
		set_tls_options(ctx);
		break;
	default:
		ms_warning("unexpected proto, using datagram");
	}
	/*see if it looks like an IPv6 address*/
	int use_rports = ctx->use_rports; // Copy char to int to avoid bad alignment
	eXosip_set_option(EXOSIP_OPT_USE_RPORT,&use_rports);
	int dont_use_101 = !ctx->use_101; // Copy char to int to avoid bad alignment
	eXosip_set_option(EXOSIP_OPT_DONT_SEND_101,&dont_use_101);
	sal_set_dscp(ctx,ctx->dscp);
	sal_use_dates(ctx,ctx->add_dates);

	ipv6=strchr(addr,':')!=NULL;
	eXosip_enable_ipv6(ipv6);

	if (is_secure && tr == SalTransportUDP){
		ms_fatal("SIP over DTLS is not supported yet.");
		return -1;
	}
	err=eXosip_listen_addr(proto, addr, port, ipv6 ?  PF_INET6 : PF_INET, is_secure);
	ctx->running=TRUE;
	return err;
}

ortp_socket_t sal_get_socket(Sal *ctx){
#ifdef HAVE_EXOSIP_GET_SOCKET
	return eXosip_get_socket(IPPROTO_UDP);
#else
	ms_warning("Sorry, eXosip does not have eXosip_get_socket() method");
	return -1;
#endif
}

void sal_set_user_agent(Sal *ctx, const char *user_agent){
	eXosip_set_user_agent(user_agent);
}

void sal_use_session_timers(Sal *ctx, int expires){
	ctx->session_expires=expires;
}

void sal_use_one_matching_codec_policy(Sal *ctx, bool_t one_matching_codec){
	ctx->one_matching_codec=one_matching_codec;
}

MSList *sal_get_pending_auths(Sal *sal){
	return ms_list_copy(sal->pending_auths);
}

void sal_use_double_registrations(Sal *ctx, bool_t enabled){
	ctx->double_reg=enabled;
}

void sal_expire_old_registration_contacts(Sal *ctx, bool_t enabled){
	ctx->expire_old_contact=enabled;
}

void sal_use_dates(Sal *ctx, bool_t enabled){
	ctx->add_dates=enabled;
#ifdef EXOSIP_OPT_REGISTER_WITH_DATE
	{
		int tmp=enabled;
		eXosip_set_option(EXOSIP_OPT_REGISTER_WITH_DATE,&tmp);
	}
#else
	if (enabled) ms_warning("Exosip does not support EXOSIP_OPT_REGISTER_WITH_DATE option.");
#endif
}

void sal_use_rport(Sal *ctx, bool_t use_rports){
	ctx->use_rports=use_rports;
}
void sal_use_101(Sal *ctx, bool_t use_101){
	ctx->use_101=use_101;
}

void sal_set_root_ca(Sal* ctx, const char* rootCa) {
	if (ctx->rootCa)
		ms_free(ctx->rootCa);
	ctx->rootCa = ms_strdup(rootCa);
	set_tls_options(ctx);
}

const char *sal_get_root_ca(Sal* ctx) {
	return ctx->rootCa;
}

void sal_verify_server_certificates(Sal *ctx, bool_t verify){
	ctx->verify_server_certs=verify;
#ifdef HAVE_EXOSIP_TLS_VERIFY_CERTIFICATE
	eXosip_tls_verify_certificate(verify);
#endif
}

void sal_verify_server_cn(Sal *ctx, bool_t verify){
	ctx->verify_server_cn=verify;
#ifdef HAVE_EXOSIP_TLS_VERIFY_CN
	eXosip_tls_verify_cn(verify);
#endif
}

static int extract_received_rport(osip_message_t *msg, const char **received, int *rportval,SalTransport* transport){
	osip_via_t *via=NULL;
	osip_generic_param_t *param=NULL;
	const char *rport=NULL;

	*rportval=5060;
	*received=NULL;
	osip_message_get_via(msg,0,&via);
	if (!via) {
		ms_warning("extract_received_rport(): no via.");
		return -1;
	}

	*transport = sal_transport_parse(via->protocol);
	
	if (via->port && via->port[0]!='\0')
		*rportval=atoi(via->port);
	
	osip_via_param_get_byname(via,"rport",&param);
	if (param) {
		rport=param->gvalue;
		if (rport && rport[0]!='\0') *rportval=atoi(rport);
		*received=via->host;
	}
	param=NULL;
	osip_via_param_get_byname(via,"received",&param);
	if (param) *received=param->gvalue;

	if (rport==NULL && *received==NULL){
		ms_warning("extract_received_rport(): no rport and no received parameters.");
		return -1;
	}
	return 0;
}

static void set_sdp(osip_message_t *sip,sdp_message_t *msg){
	int sdplen;
	char clen[10];
	char *sdp=NULL;
	sdp_message_to_str(msg,&sdp);
	sdplen=strlen(sdp);
	snprintf(clen,sizeof(clen),"%i",sdplen);
	osip_message_set_body(sip,sdp,sdplen);
	osip_message_set_content_type(sip,"application/sdp");
	osip_message_set_content_length(sip,clen);
	osip_free(sdp);
}

static void set_sdp_from_desc(osip_message_t *sip, const SalMediaDescription *desc){
	sdp_message_t *msg=media_description_to_sdp(desc);
	if (msg==NULL) {
		ms_error("Fail to print sdp message !");
		return;
	}
	set_sdp(sip,msg);
	sdp_message_free(msg);
}

static void sdp_process(SalOp *h){
	ms_message("Doing SDP offer/answer process of type %s",h->sdp_offering ? "outgoing" : "incoming");
	if (h->result){
		sal_media_description_unref(h->result);
	}
	h->result=sal_media_description_new();
	if (h->sdp_offering){	
		offer_answer_initiate_outgoing(h->base.local_media,h->base.remote_media,h->result);
	}else{
		int i;
		if (h->sdp_answer){
			sdp_message_free(h->sdp_answer);
		}
		offer_answer_initiate_incoming(h->base.local_media,h->base.remote_media,h->result,h->base.root->one_matching_codec);
		h->sdp_answer=media_description_to_sdp(h->result);
		/*once we have generated the SDP answer, we modify the result description for processing by the upper layer.
		 It should contains media parameters constraint from the remote offer, not our response*/
		strcpy(h->result->addr,h->base.remote_media->addr);
		h->result->bandwidth=h->base.remote_media->bandwidth;
		
		for(i=0;i<h->result->n_active_streams;++i){
			strcpy(h->result->streams[i].rtp_addr,h->base.remote_media->streams[i].rtp_addr);
			strcpy(h->result->streams[i].rtcp_addr,h->base.remote_media->streams[i].rtcp_addr);
			h->result->streams[i].ptime=h->base.remote_media->streams[i].ptime;
			h->result->streams[i].bandwidth=h->base.remote_media->streams[i].bandwidth;
			h->result->streams[i].rtp_port=h->base.remote_media->streams[i].rtp_port;
			h->result->streams[i].rtcp_port=h->base.remote_media->streams[i].rtcp_port;
			if (h->result->streams[i].proto == SalProtoRtpSavp) {
				h->result->streams[i].crypto[0] = h->base.remote_media->streams[i].crypto[0];
			}
		}
	}
	
}

int sal_call_is_offerer(const SalOp *h){
	return h->sdp_offering;
}

int sal_call_set_local_media_description(SalOp *h, SalMediaDescription *desc){
	if (desc)
		sal_media_description_ref(desc);
	if (h->base.local_media)
		sal_media_description_unref(h->base.local_media);
	h->base.local_media=desc;
	if (h->base.remote_media){
		/*case of an incoming call where we modify the local capabilities between the time
		 * the call is ringing and it is accepted (for example if you want to accept without video*/
		/*reset the sdp answer so that it is computed again*/
		if (h->sdp_answer){
			sdp_message_free(h->sdp_answer);
			h->sdp_answer=NULL;
		}
	}
	return 0;
}

int sal_call(SalOp *h, const char *from, const char *to){
	int err;
	const char *route;
	osip_message_t *invite=NULL;
	osip_call_id_t *callid;
	sal_op_set_from(h,from);
	sal_op_set_to(h,to);
	sal_exosip_fix_route(h);
	
	h->terminated = FALSE;

	route = sal_op_get_route(h);
	err=eXosip_call_build_initial_invite(&invite,to,from,route,"Phone call");
	if (err!=0){
		ms_error("Could not create call. Error %d (from=%s to=%s route=%s)",
				err, from, to, route);
		return -1;
	}
	osip_message_set_allow(invite, "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO");
	if (h->base.contact){
		_osip_list_set_empty(&invite->contacts,(void (*)(void*))osip_contact_free);
		osip_message_set_contact(invite,h->base.contact);
	}
	if (h->base.root->session_expires!=0){
		osip_message_set_header(invite, "Session-expires", "200");
		osip_message_set_supported(invite, "timer");
	}
	sal_exosip_add_custom_headers(invite,h->base.custom_headers);
	if (h->base.local_media){
		h->sdp_offering=TRUE;
		set_sdp_from_desc(invite,h->base.local_media);
	}else h->sdp_offering=FALSE;
	if (h->replaces){
		osip_message_set_header(invite,"Replaces",h->replaces);
		if (h->referred_by)
			osip_message_set_header(invite,"Referred-By",h->referred_by);
	}
	
	eXosip_lock();
	err=eXosip_call_send_initial_invite(invite);
	eXosip_unlock();
	h->cid=err;
	if (err<0){
		ms_error("Fail to send invite ! Error code %d", err);
		return -1;
	}else{
		char *tmp=NULL;
		callid=osip_message_get_call_id(invite);
		osip_call_id_to_str(callid,&tmp);
		h->base.call_id=ms_strdup(tmp);
		osip_free(tmp);
		sal_add_call(h->base.root,h);
	}
	return 0;
}

int sal_call_notify_ringing(SalOp *h, bool_t early_media){
	osip_message_t *msg;
	
	/*if early media send also 180 and 183 */
	if (early_media){
		msg=NULL;
		eXosip_lock();
		eXosip_call_build_answer(h->tid,183,&msg);
		if (msg){
			sdp_process(h);
			if (h->sdp_answer){
				set_sdp(msg,h->sdp_answer);
				sdp_message_free(h->sdp_answer);
				h->sdp_answer=NULL;
			}
			eXosip_call_send_answer(h->tid,183,msg);
		}
		eXosip_unlock();
	}else{
		eXosip_lock();
		eXosip_call_send_answer(h->tid,180,NULL);
		eXosip_unlock();
	}
	return 0;
}

int sal_call_accept(SalOp * h){
	osip_message_t *msg;
	const char *contact=sal_op_get_contact(h);
	/* sends a 200 OK */
	int err=eXosip_call_build_answer(h->tid,200,&msg);
	if (err<0 || msg==NULL){
		ms_error("Fail to build answer for call: err=%i",err);
		return -1;
	}
	if (h->base.root->session_expires!=0){
		if (h->supports_session_timers) osip_message_set_supported(msg, "timer");
	}

	if (contact) {
		_osip_list_set_empty(&msg->contacts,(void (*)(void*))osip_contact_free);
		osip_message_set_contact(msg,contact);
	}
	
	if (h->base.local_media){
		/*this is the case where we received an invite without SDP*/
		if (h->sdp_offering) {
			set_sdp_from_desc(msg,h->base.local_media);
		}else{
			if (h->sdp_answer==NULL) sdp_process(h);
			if (h->sdp_answer){
				set_sdp(msg,h->sdp_answer);
				sdp_message_free(h->sdp_answer);
				h->sdp_answer=NULL;
			}
		}
	}else{
		ms_error("You are accepting a call but not defined any media capabilities !");
	}
	eXosip_call_send_answer(h->tid,200,msg);
	return 0;
}

int sal_call_decline(SalOp *h, SalReason reason, const char *redirect){
	if (reason==SalReasonBusy){
		eXosip_lock();
		eXosip_call_send_answer(h->tid,486,NULL);
		eXosip_unlock();
	}
	else if (reason==SalReasonTemporarilyUnavailable){
		eXosip_lock();
		eXosip_call_send_answer(h->tid,480,NULL);
		eXosip_unlock();
	}else if (reason==SalReasonDoNotDisturb){
		eXosip_lock();
		eXosip_call_send_answer(h->tid,600,NULL);
		eXosip_unlock();
	}else if (reason==SalReasonMedia){
		eXosip_lock();
		eXosip_call_send_answer(h->tid,415,NULL);
		eXosip_unlock();
	}else if (redirect!=NULL && reason==SalReasonRedirect){
		osip_message_t *msg;
		int code;
		if (strstr(redirect,"sip:")!=0) code=302;
		else code=380;
		eXosip_lock();
		eXosip_call_build_answer(h->tid,code,&msg);
		osip_message_set_contact(msg,redirect);
		eXosip_call_send_answer(h->tid,code,msg);
		eXosip_unlock();
	}else sal_call_terminate(h);
	return 0;
}

SalMediaDescription * sal_call_get_remote_media_description(SalOp *h){
	return h->base.remote_media;
}

SalMediaDescription * sal_call_get_final_media_description(SalOp *h){
	if (h->base.local_media && h->base.remote_media && !h->result){
		sdp_process(h);
	}
	return h->result;
}

int sal_call_set_referer(SalOp *h, SalOp *refered_call){
	if (refered_call->replaces)
		h->replaces=ms_strdup(refered_call->replaces);
	if (refered_call->referred_by)
		h->referred_by=ms_strdup(refered_call->referred_by);
	return 0;
}

static int send_notify_for_refer(int did, const char *sipfrag){
	osip_message_t *msg;
	eXosip_lock();
	eXosip_call_build_notify(did,EXOSIP_SUBCRSTATE_ACTIVE,&msg);
	if (msg==NULL){
		eXosip_unlock();
		ms_warning("Could not build NOTIFY for refer.");
		return -1;
	}
	osip_message_set_content_type(msg,"message/sipfrag");
	osip_message_set_header(msg,"Event","refer");
	osip_message_set_body(msg,sipfrag,strlen(sipfrag));
	eXosip_call_send_request(did,msg);
	eXosip_unlock();
	return 0;
}

/* currently only support to notify trying and 200Ok*/
int sal_call_notify_refer_state(SalOp *h, SalOp *newcall){
	if (newcall==NULL){
		/* in progress*/
		send_notify_for_refer(h->did,"SIP/2.0 100 Trying\r\n");
	}
	else if (newcall->cid!=-1){
		if (newcall->did==-1){
			/* not yet established*/
			if (!newcall->terminated){
				/* in progress*/
				send_notify_for_refer(h->did,"SIP/2.0 100 Trying\r\n");
			}
		}else{
			if (!newcall->terminated){
				if (send_notify_for_refer(h->did,"SIP/2.0 200 Ok\r\n")==-1){
					/* we need previous notify transaction to complete, so buffer the request for later*/
					h->sipfrag_pending="SIP/2.0 200 Ok\r\n";
				}
			}
		}
	}
	return 0;
}

int sal_ping(SalOp *op, const char *from, const char *to){
	osip_message_t *options=NULL;
	
	sal_op_set_from(op,from);
	sal_op_set_to(op,to);
	sal_exosip_fix_route(op);

	eXosip_options_build_request (&options, sal_op_get_to(op),
			sal_op_get_from(op),sal_op_get_route(op));
	if (options){
		if (op->base.root->session_expires!=0){
			osip_message_set_header(options, "Session-expires", "200");
			osip_message_set_supported(options, "timer");
		}
		sal_add_other(sal_op_get_sal(op),op,options);
		return eXosip_options_send_request(options);
	}
	return -1;
}

int sal_call_refer(SalOp *h, const char *refer_to){
	osip_message_t *msg=NULL;
	int err=0;
	eXosip_lock();
	eXosip_call_build_refer(h->did,refer_to, &msg);
	if (msg) err=eXosip_call_send_request(h->did, msg);
	else err=-1;
	eXosip_unlock();
	return err;
}

int sal_call_refer_with_replaces(SalOp *h, SalOp *other_call_h){
	osip_message_t *msg=NULL;
	char referto[256]={0};
	int err=0;
	eXosip_lock();
	if (eXosip_call_get_referto(other_call_h->did,referto,sizeof(referto)-1)!=0){
		ms_error("eXosip_call_get_referto() failed for did=%i",other_call_h->did);
		eXosip_unlock();
		return -1;
	}
	eXosip_call_build_refer(h->did,referto, &msg);
	osip_message_set_header(msg,"Referred-By",h->base.from);
	if (msg) err=eXosip_call_send_request(h->did, msg);
	else err=-1;
	eXosip_unlock();
	return err;
}

SalOp *sal_call_get_replaces(SalOp *h){
	if (h!=NULL && h->replaces!=NULL){
		int cid;
		eXosip_lock();
		cid=eXosip_call_find_by_replaces(h->replaces);
		eXosip_unlock();
		if (cid>0){
			SalOp *ret=sal_find_call(h->base.root,cid);
			return ret;
		}
	}
	return NULL;
}

int sal_call_send_dtmf(SalOp *h, char dtmf){
	osip_message_t *msg=NULL;
	char dtmf_body[128];
	char clen[10];

	eXosip_lock();
	eXosip_call_build_info(h->did,&msg);
	if (msg){
		snprintf(dtmf_body, sizeof(dtmf_body), "Signal=%c\r\nDuration=250\r\n", dtmf);
		osip_message_set_body(msg,dtmf_body,strlen(dtmf_body));
		osip_message_set_content_type(msg,"application/dtmf-relay");
		snprintf(clen,sizeof(clen),"%lu",(unsigned long)strlen(dtmf_body));
		osip_message_set_content_length(msg,clen);		
		eXosip_call_send_request(h->did,msg);
	}
	eXosip_unlock();
	return 0;
}

static void push_auth_to_exosip(const SalAuthInfo *info){
	const char *userid;
	if (info->userid==NULL || info->userid[0]=='\0') userid=info->username;
	else userid=info->userid;
	ms_message("Authentication info for username [%s], id[%s], realm [%s] added to eXosip", info->username,userid, info->realm);
	eXosip_add_authentication_info (info->username,userid,
                                  info->password, NULL,info->realm);
}
/*
 * Just for symmetry ;-)
 */
static void pop_auth_from_exosip() {
	eXosip_clear_authentication_info();
}

int sal_call_terminate(SalOp *h){
	int err;
	if (h == NULL) return -1;
	if (h->auth_info) push_auth_to_exosip(h->auth_info);
	eXosip_lock();
	err=eXosip_call_terminate(h->cid,h->did);
	eXosip_unlock();
	if (!h->base.root->reuse_authorization) pop_auth_from_exosip();
	if (err!=0){
		ms_warning("Exosip could not terminate the call: cid=%i did=%i", h->cid,h->did);
	}
	h->terminated=TRUE;
	return 0;
}

void sal_op_authenticate(SalOp *h, const SalAuthInfo *info){
       bool_t terminating=FALSE;
       if (h->pending_auth && strcmp(h->pending_auth->request->sip_method,"BYE")==0) {
               terminating=TRUE;
       }
       if (h->terminated && !terminating) return;

       if (h->pending_auth){
		push_auth_to_exosip(info);
		
        /*FIXME exosip does not take into account this update register message*/
	/*
        if (fix_message_contact(h, h->pending_auth->request,h->pending_auth->response)) {
            
        };
	*/
		update_contact_from_response(h,h->pending_auth->response);
		eXosip_lock();
		eXosip_default_action(h->pending_auth);
		eXosip_unlock();
		ms_message("eXosip_default_action() done");
		if (!h->base.root->reuse_authorization) pop_auth_from_exosip();
		
		if (h->auth_info) sal_auth_info_delete(h->auth_info); /*if already exist*/
		h->auth_info=sal_auth_info_clone(info); /*store auth info for subsequent request*/
	}
}
void sal_op_cancel_authentication(SalOp *h) {
	if (h->rid >0) {
		sal_op_get_sal(h)->callbacks.register_failure(h,SalErrorFailure, SalReasonForbidden,"Authentication failure");
	} else if (h->cid >0) {
		sal_op_get_sal(h)->callbacks.call_failure(h,SalErrorFailure, SalReasonForbidden,"Authentication failure",0);
	} else {
		ms_warning("Auth failure not handled");
	}

}
static void set_network_origin(SalOp *op, osip_message_t *req){
	const char *received=NULL;
	int rport=5060;
	char origin[64]={0};
    SalTransport transport;
	if (extract_received_rport(req,&received,&rport,&transport)!=0){
		osip_via_t *via=NULL;
		char *tmp;
		osip_message_get_via(req,0,&via);
		received=osip_via_get_host(via);
		tmp=osip_via_get_port(via);
		if (tmp) rport=atoi(tmp);
	}
    if (transport != SalTransportUDP) {
        snprintf(origin,sizeof(origin)-1,"sip:%s:%i",received,rport);
    } else {
       snprintf(origin,sizeof(origin)-1,"sip:%s:%i;transport=%s",received,rport,sal_transport_to_string(transport)); 
    }
	__sal_op_set_network_origin(op,origin);
}

static void set_remote_ua(SalOp* op, osip_message_t *req){
	if (op->base.remote_ua==NULL){
		osip_header_t *h=NULL;
		osip_message_get_user_agent(req,0,&h);
		if (h){
			op->base.remote_ua=ms_strdup(h->hvalue);
		}
	}
}

static void set_remote_contact(SalOp* op, osip_message_t *req){
	if (op->base.remote_contact==NULL){
		osip_contact_t *h=NULL;
		osip_message_get_contact(req,0,&h);
		if (h){
			char *tmp=NULL;
			osip_contact_to_str(h,&tmp);
			__sal_op_set_remote_contact(op,tmp);
			osip_free(tmp);
		}
	}
}

static void set_replaces(SalOp *op, osip_message_t *req){
	osip_header_t *h=NULL;

	if (op->replaces){
		ms_free(op->replaces);
		op->replaces=NULL;
	}
	osip_message_header_get_byname(req,"replaces",0,&h);
	if (h){
		if (h->hvalue && h->hvalue[0]!='\0'){
			op->replaces=ms_strdup(h->hvalue);
		}
	}
}

static SalOp *find_op(Sal *sal, eXosip_event_t *ev){
	if (ev->cid>0){
		return sal_find_call(sal,ev->cid);
	}
	if (ev->rid>0){
		return sal_find_register(sal,ev->rid);
	}
	if (ev->sid>0){
		return sal_find_out_subscribe(sal,ev->sid);
	}
	if (ev->nid>0){
		return sal_find_in_subscribe(sal,ev->nid);
	}
	if (ev->response) return sal_find_other(sal,ev->response);
	else if (ev->request) return sal_find_other(sal,ev->request);
	return NULL;
}

static void inc_new_call(Sal *sal, eXosip_event_t *ev){
	SalOp *op=sal_op_new(sal);
	osip_from_t *from,*to;
	osip_call_info_t *call_info;
	char *tmp=NULL;
	sdp_message_t *sdp=eXosip_get_sdp_info(ev->request);
	
	osip_call_id_t *callid=osip_message_get_call_id(ev->request);
	
	osip_call_id_to_str(callid,&tmp);
	op->base.call_id=ms_strdup(tmp);
	osip_free(tmp);
	
	set_network_origin(op,ev->request);
	set_remote_contact(op,ev->request);
	set_remote_ua(op,ev->request);
	set_replaces(op,ev->request);
	sal_op_set_custom_header(op,sal_exosip_get_custom_headers(ev->request));
	
	if (sdp){
		op->sdp_offering=FALSE;
		op->base.remote_media=sal_media_description_new();
		sdp_to_media_description(sdp,op->base.remote_media);
		sdp_message_free(sdp);
	}else op->sdp_offering=TRUE;

	from=osip_message_get_from(ev->request);
	to=osip_message_get_to(ev->request);
	osip_from_to_str(from,&tmp);
	sal_op_set_from(op,tmp);
	osip_free(tmp);
	osip_from_to_str(to,&tmp);
	sal_op_set_to(op,tmp);
	osip_free(tmp);

	osip_message_get_call_info(ev->request,0,&call_info);
	if(call_info)
	{
		osip_call_info_to_str(call_info,&tmp);
		if( strstr(tmp,"answer-after=") != NULL)
		{
			op->auto_answer_asked=TRUE;
			ms_message("The caller asked to automatically answer the call(Emergency?)\n");
		}
		osip_free(tmp);
	}

	op->tid=ev->tid;
	op->cid=ev->cid;
	op->did=ev->did;
	sal_add_call(op->base.root,op);
	sal->callbacks.call_received(op);
}

static void handle_reinvite(Sal *sal,  eXosip_event_t *ev){
	SalOp *op=find_op(sal,ev);
	sdp_message_t *sdp;

	if (op==NULL) {
		ms_warning("Reinvite for non-existing operation !");
		return;
	}
	op->reinvite=TRUE;
	op->tid=ev->tid;
	sdp=eXosip_get_sdp_info(ev->request);
	if (op->base.remote_media){
		sal_media_description_unref(op->base.remote_media);
		op->base.remote_media=NULL;
	}
	if (op->result){
		sal_media_description_unref(op->result);
		op->result=NULL;
	}
	if (sdp){
		op->sdp_offering=FALSE;
		op->base.remote_media=sal_media_description_new();
		sdp_to_media_description(sdp,op->base.remote_media);
		sdp_message_free(sdp);
		
	}else {
		op->sdp_offering=TRUE;
	}
	sal->callbacks.call_updating(op);
}

static void handle_ack(Sal *sal,  eXosip_event_t *ev){
	SalOp *op=find_op(sal,ev);
	sdp_message_t *sdp;

	if (op==NULL) {
		ms_warning("ack for non-existing call !");
		return;
	}
	if (op->terminated) {
		ms_warning("ack for terminated call, ignoring");
		return;
	}
	
	if (op->sdp_offering){
		sdp=eXosip_get_sdp_info(ev->ack);
		if (sdp){
			if (op->base.remote_media)
				sal_media_description_unref(op->base.remote_media);
			op->base.remote_media=sal_media_description_new();
			sdp_to_media_description(sdp,op->base.remote_media);
			sdp_process(op);
			sdp_message_free(sdp);
		}
	}
	if (op->reinvite){
		op->reinvite=FALSE;
	}
	sal->callbacks.call_ack(op);
}

static void update_contact_from_response(SalOp *op, osip_message_t *response){
	const char *received;
	int rport;
	SalTransport transport;
	if (extract_received_rport(response,&received,&rport,&transport)==0){
		const char *contact=sal_op_get_contact(op);
		if (!contact){
			/*no contact given yet, use from instead*/
			contact=sal_op_get_from(op);
		}
		if (contact){
			SalAddress *addr=sal_address_new(contact);
			char *tmp;
			sal_address_set_domain(addr,received);
			sal_address_set_port_int(addr,rport);
			if (transport!=SalTransportUDP)
				sal_address_set_transport(addr,transport);
			tmp=sal_address_as_string(addr);
			ms_message("Contact address updated to %s",tmp);
			sal_op_set_contact(op,tmp);
			sal_address_destroy(addr);
			ms_free(tmp);
		}
	}
}

static int call_proceeding(Sal *sal, eXosip_event_t *ev){
	SalOp *op=find_op(sal,ev);

	if (op==NULL || op->terminated==TRUE) {
		ms_warning("This call has been canceled.");
		eXosip_lock();
		eXosip_call_terminate(ev->cid,ev->did);
		eXosip_unlock();
		return -1;
	}
	if (ev->did>0)
		op->did=ev->did;
	op->tid=ev->tid;
	
	/* update contact if received and rport are set by the server
	 note: will only be used by remote for next INVITE, if any...*/
	update_contact_from_response(op,ev->response);
	return 0;
}

static void call_ringing(Sal *sal, eXosip_event_t *ev){
	sdp_message_t *sdp;
	SalOp *op=find_op(sal,ev);
	if (call_proceeding(sal, ev)==-1) return;

	set_remote_ua(op,ev->response);
	sdp=eXosip_get_sdp_info(ev->response);
	if (sdp){
		op->base.remote_media=sal_media_description_new();
		sdp_to_media_description(sdp,op->base.remote_media);
		sdp_message_free(sdp);
		if (op->base.local_media) sdp_process(op);
	}
	sal->callbacks.call_ringing(op);
}

static void call_accepted(Sal *sal, eXosip_event_t *ev){
	sdp_message_t *sdp;
	osip_message_t *msg=NULL;
	SalOp *op=find_op(sal,ev);
	const char *contact;
	
	if (op==NULL || op->terminated==TRUE) {
		ms_warning("This call has been already terminated.");
		eXosip_lock();
		eXosip_call_terminate(ev->cid,ev->did);
		eXosip_unlock();
		return ;
	}

	op->did=ev->did;
	set_remote_ua(op,ev->response);
	set_remote_contact(op,ev->response);

	sdp=eXosip_get_sdp_info(ev->response);
	if (sdp){
		op->base.remote_media=sal_media_description_new();
		sdp_to_media_description(sdp,op->base.remote_media);
		sdp_message_free(sdp);
		if (op->base.local_media) sdp_process(op);
	}
	eXosip_call_build_ack(ev->did,&msg);
	if (msg==NULL) {
		ms_warning("This call has been already terminated.");
		eXosip_lock();
		eXosip_call_terminate(ev->cid,ev->did);
		eXosip_unlock();
		return ;
	}
	contact=sal_op_get_contact(op);
	if (contact) {
		_osip_list_set_empty(&msg->contacts,(void (*)(void*))osip_contact_free);
		osip_message_set_contact(msg,contact);
	}
	if (op->sdp_answer){
		set_sdp(msg,op->sdp_answer);
		sdp_message_free(op->sdp_answer);
		op->sdp_answer=NULL;
	}
	eXosip_call_send_ack(ev->did,msg);
	sal->callbacks.call_accepted(op);
}

static void call_terminated(Sal *sal, eXosip_event_t *ev){
	char *from=NULL;
	SalOp *op=find_op(sal,ev);
	if (op==NULL){
		ms_warning("Call terminated for already closed call ?");
		return;
	}
	if (ev->request){
		osip_from_to_str(ev->request->from,&from);
	}
	sal->callbacks.call_terminated(op,from!=NULL ? from : sal_op_get_from(op));
	if (from) osip_free(from);
	op->terminated=TRUE;
}

static void call_released(Sal *sal, eXosip_event_t *ev){
	SalOp *op=find_op(sal,ev);
	if (op==NULL){
		ms_warning("No op associated to this call_released()");
		return;
	}
	if (!op->terminated){
		/* no response received so far */
		call_failure(sal,ev);
	}
	sal->callbacks.call_released(op);
}

static int get_auth_data_from_response(osip_message_t *resp, const char **realm, const char **username){
	const char *prx_realm=NULL,*www_realm=NULL;
	osip_proxy_authenticate_t *prx_auth;
	osip_www_authenticate_t *www_auth;
	
	*username=osip_uri_get_username(resp->from->url);
	prx_auth=(osip_proxy_authenticate_t*)osip_list_get(&resp->proxy_authenticates,0);
	www_auth=(osip_proxy_authenticate_t*)osip_list_get(&resp->www_authenticates,0);
	if (prx_auth!=NULL)
		prx_realm=osip_proxy_authenticate_get_realm(prx_auth);
	if (www_auth!=NULL)
		www_realm=osip_www_authenticate_get_realm(www_auth);

	if (prx_realm){
		*realm=prx_realm;
	}else if (www_realm){
		*realm=www_realm;
	}else{
		return -1;
	}
	return 0;
}

static int get_auth_data_from_request(osip_message_t *msg, const char **realm, const char **username){
	osip_authorization_t *auth=NULL;
	osip_proxy_authorization_t *prx_auth=NULL;
	
	*username=osip_uri_get_username(msg->from->url);
	osip_message_get_authorization(msg, 0, &auth);
	if (auth){
		*realm=osip_authorization_get_realm(auth);
		return 0;
	}
	osip_message_get_proxy_authorization(msg,0,&prx_auth);
	if (prx_auth){
		*realm=osip_proxy_authorization_get_realm(prx_auth);
		return 0;
	}
	return -1;
}

static int get_auth_data(eXosip_event_t *ev, const char **realm, const char **username){
	if (ev->response && get_auth_data_from_response(ev->response,realm,username)==0) return 0;
	if (ev->request && get_auth_data_from_request(ev->request,realm,username)==0) return 0;
	return -1;
}

int sal_op_get_auth_requested(SalOp *op, const char **realm, const char **username){
	if (op->pending_auth){
		return get_auth_data(op->pending_auth,realm,username);
	}
	return -1;
}

static bool_t process_authentication(Sal *sal, eXosip_event_t *ev){
	SalOp *op;
	const char *username,*realm;
	op=find_op(sal,ev);
	if (op==NULL){
		ms_warning("No operation associated with this authentication !");
		return TRUE;
	}
	if (get_auth_data(ev,&realm,&username)==0){
		if (op->pending_auth!=NULL){
			eXosip_event_free(op->pending_auth);
			op->pending_auth=ev;
		}else{
			op->pending_auth=ev;
			sal_add_pending_auth(sal,op);
		}
		
		sal->callbacks.auth_requested(op,realm,username);
		return FALSE;
	}
	return TRUE;
}

static void authentication_ok(Sal *sal, eXosip_event_t *ev){
	SalOp *op;
	const char *username,*realm;
	op=find_op(sal,ev);
	if (op==NULL){
		ms_warning("No operation associated with this authentication_ok!");
		return ;
	}
	if (op->pending_auth){
		eXosip_event_free(op->pending_auth);
		sal_remove_pending_auth(sal,op);
		op->pending_auth=NULL;
	}
	if (get_auth_data(ev,&realm,&username)==0){
		sal->callbacks.auth_success(op,realm,username);
	}
}

static bool_t call_failure(Sal *sal, eXosip_event_t *ev){
	SalOp *op;
	int code=0;
	char* computedReason=NULL;
	const char *reason=NULL;
	SalError error=SalErrorUnknown;
	SalReason sr=SalReasonUnknown;
	

	op=(SalOp*)find_op(sal,ev);

	if (op==NULL) {
		ms_warning("Call failure reported for a closed call, ignored.");
		return TRUE;
	}

	if (ev->response){
		code=osip_message_get_status_code(ev->response);
		reason=osip_message_get_reason_phrase(ev->response);
		osip_header_t *h=NULL;
		if (!osip_message_header_get_byname(	ev->response
											,"Reason"
											,0
											,&h)) {
			computedReason = ms_strdup_printf("%s %s",reason,osip_header_get_value(h));
			reason = computedReason;

		}
	}
	switch(code)
	{
		case 401:
		case 407:
			return process_authentication(sal,ev);
			break;
		case 400:
			error=SalErrorUnknown;
		break;
		case 404:
			error=SalErrorFailure;
			sr=SalReasonNotFound;
		break;
		case 415:
			error=SalErrorFailure;
			sr=SalReasonMedia;
		break;
		case 422:
			eXosip_default_action(ev);
			return TRUE;
		break;
		case 480:
			error=SalErrorFailure;
			sr=SalReasonTemporarilyUnavailable;
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		break;
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		case 486:
			error=SalErrorFailure;
			sr=SalReasonBusy;
		break;
		case 487:
		break;
		case 600:
			error=SalErrorFailure;
			sr=SalReasonDoNotDisturb;
		break;
		case 603:
			error=SalErrorFailure;
			sr=SalReasonDeclined;
		break;
		default:
			if (code>0){
				error=SalErrorFailure;
				sr=SalReasonUnknown;
			}else error=SalErrorNoResponse;
	}
	op->terminated=TRUE;
	sal->callbacks.call_failure(op,error,sr,reason,code);
	if (computedReason != NULL){
		ms_free(computedReason);
	}
	return TRUE;
}

/* Request remote side to send us VFU */
void sal_call_send_vfu_request(SalOp *h){
	osip_message_t *msg=NULL;
	char info_body[] =
			"<?xml version=\"1.0\" encoding=\"utf-8\" ?>"
			 "<media_control>"
			 "  <vc_primitive>"
			 "    <to_encoder>"
			 "      <picture_fast_update></picture_fast_update>"
			 "    </to_encoder>"
			 "  </vc_primitive>"
			 "</media_control>";

	char clen[10];

	eXosip_lock();
	eXosip_call_build_info(h->did,&msg);
	if (msg){
		osip_message_set_body(msg,info_body,strlen(info_body));
		osip_message_set_content_type(msg,"application/media_control+xml");
		snprintf(clen,sizeof(clen),"%lu",(unsigned long)strlen(info_body));
		osip_message_set_content_length(msg,clen);
		eXosip_call_send_request(h->did,msg);
		ms_message("Sending VFU request !");
	}
	eXosip_unlock();
}

static void process_media_control_xml(Sal *sal, eXosip_event_t *ev){
	SalOp *op=find_op(sal,ev);
	osip_body_t *body=NULL;

	if (op==NULL){
		ms_warning("media control xml received without operation context!");
		return ;
	}
	
	osip_message_get_body(ev->request,0,&body);
	if (body && body->body!=NULL &&
		strstr(body->body,"picture_fast_update")){
		osip_message_t *ans=NULL;
		ms_message("Receiving VFU request !");
		if (sal->callbacks.vfu_request){
			sal->callbacks.vfu_request(op);
			eXosip_call_build_answer(ev->tid,200,&ans);
			if (ans)
				eXosip_call_send_answer(ev->tid,200,ans);
			return;
		}
	}
	/*in all other cases we must say it is not implemented.*/
	{
		osip_message_t *ans=NULL;
		eXosip_lock();
		eXosip_call_build_answer(ev->tid,501,&ans);
		if (ans)
			eXosip_call_send_answer(ev->tid,501,ans);
		eXosip_unlock();
	}
}

static void process_dtmf_relay(Sal *sal, eXosip_event_t *ev){
	SalOp *op=find_op(sal,ev);
	osip_body_t *body=NULL;

	if (op==NULL){
		ms_warning("media dtmf relay received without operation context!");
		return ;
	}
	
	osip_message_get_body(ev->request,0,&body);
	if (body && body->body!=NULL){
		osip_message_t *ans=NULL;
		const char *name=strstr(body->body,"Signal");
		if (name==NULL) name=strstr(body->body,"signal");
		if (name==NULL) {
			ms_warning("Could not extract the dtmf name from the SIP INFO.");
		}else{
			char tmp[2];
			name+=strlen("signal");
			if (sscanf(name," = %1s",tmp)==1){
				ms_message("Receiving dtmf %s via SIP INFO.",tmp);
				if (sal->callbacks.dtmf_received != NULL)
					sal->callbacks.dtmf_received(op, tmp[0]);
			}
		}
		eXosip_lock();
		eXosip_call_build_answer(ev->tid,200,&ans);
		if (ans)
			eXosip_call_send_answer(ev->tid,200,ans);
		eXosip_unlock();
	}
}

static void fill_options_answer(osip_message_t *options){
	osip_message_set_allow(options,"INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, SUBSCRIBE, NOTIFY, INFO");
	osip_message_set_accept(options,"application/sdp");
}

static void process_refer(Sal *sal, SalOp *op, eXosip_event_t *ev){
	osip_header_t *h=NULL;
	osip_message_t *ans=NULL;
	ms_message("Receiving REFER request !");
	osip_message_header_get_byname(ev->request,"Refer-To",0,&h);

	if (h){
		osip_from_t *from=NULL;
		char *tmp;
		osip_from_init(&from);
	
		if (osip_from_parse(from,h->hvalue)==0){
			if (op ){
				osip_uri_header_t *uh=NULL;
				osip_header_t *referred_by=NULL;
				osip_uri_header_get_byname(&from->url->url_headers,(char*)"Replaces",&uh);
				if (uh!=NULL && uh->gvalue && uh->gvalue[0]!='\0'){
					ms_message("Found replaces in Refer-To");
					if (op->replaces){
						ms_free(op->replaces);
					}
					op->replaces=ms_strdup(uh->gvalue);
				}
				osip_message_header_get_byname(ev->request,"Referred-By",0,&referred_by);
				if (referred_by && referred_by->hvalue && referred_by->hvalue[0]!='\0'){
					if (op->referred_by)
						ms_free(op->referred_by);
					op->referred_by=ms_strdup(referred_by->hvalue);
				}
			}
			osip_uri_header_freelist(&from->url->url_headers);
			osip_from_to_str(from,&tmp);
			sal->callbacks.refer_received(sal,op,tmp);
			osip_free(tmp);
			osip_from_free(from);
		}
		eXosip_lock();
		eXosip_call_build_answer(ev->tid,202,&ans);
		if (ans)
			eXosip_call_send_answer(ev->tid,202,ans);
		eXosip_unlock();
	}
	else
	{
		ms_warning("cannot do anything with the refer without destination\n");
	}
}

static void process_notify(Sal *sal, eXosip_event_t *ev){
	osip_header_t *h=NULL;
	char *from=NULL;
	SalOp *op=find_op(sal,ev);
	osip_message_t *ans=NULL;

	ms_message("Receiving NOTIFY request !");
	osip_from_to_str(ev->request->from,&from);
	osip_message_header_get_byname(ev->request,"Event",0,&h);
	if(h){
		osip_body_t *body=NULL;
		//osip_content_type_t *ct=NULL;
		osip_message_get_body(ev->request,0,&body);
		//ct=osip_message_get_content_type(ev->request);
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		if (h->hvalue && strncasecmp(h->hvalue,"refer",strlen("refer"))==0){
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			/*special handling of refer events*/
			if (body && body->body){
				osip_message_t *msg;
				osip_message_init(&msg);
				if (osip_message_parse_sipfrag(msg,body->body,strlen(body->body))==0){
					int code=osip_message_get_status_code(msg);
					if (code==100){
						sal->callbacks.notify_refer(op,SalReferTrying);
					}else if (code==200){
						sal->callbacks.notify_refer(op,SalReferSuccess);
					}else if (code>=400){
						sal->callbacks.notify_refer(op,SalReferFailed);
					}
				}
				osip_message_free(msg);
			}
		}else{
			/*generic handling*/
			sal->callbacks.notify(op,from,h->hvalue);
		}
	}
	/*answer that we received the notify*/
	eXosip_lock();
	eXosip_call_build_answer(ev->tid,200,&ans);
	if (ans)
		eXosip_call_send_answer(ev->tid,200,ans);
	eXosip_unlock();
	osip_free(from);
}

static void call_message_new(Sal *sal, eXosip_event_t *ev){
	osip_message_t *ans=NULL;
	if (ev->request){
		if (MSG_IS_INFO(ev->request)){
			osip_content_type_t *ct;
			ct=osip_message_get_content_type(ev->request);
			if (ct && ct->subtype){
				if (strcmp(ct->subtype,"media_control+xml")==0)
					process_media_control_xml(sal,ev);
				else if (strcmp(ct->subtype,"dtmf-relay")==0)
					process_dtmf_relay(sal,ev);
				else {
					ms_message("Unhandled SIP INFO.");
					/*send an "Not implemented" answer*/
					eXosip_lock();
					eXosip_call_build_answer(ev->tid,501,&ans);
					if (ans)
						eXosip_call_send_answer(ev->tid,501,ans);
					eXosip_unlock();
				}
			}else{
				/*empty SIP INFO, probably to test we are alive. Send an empty answer*/
				eXosip_lock();
				eXosip_call_build_answer(ev->tid,200,&ans);
				if (ans)
					eXosip_call_send_answer(ev->tid,200,ans);
				eXosip_unlock();
			}
		}else if(MSG_IS_MESSAGE(ev->request)){
			/* SIP messages could be received into call */
			text_received(sal, ev);
			eXosip_lock();
			eXosip_call_build_answer(ev->tid,200,&ans);
			if (ans)
				eXosip_call_send_answer(ev->tid,200,ans);
			eXosip_unlock();
		}else if(MSG_IS_REFER(ev->request)){
			SalOp *op=find_op(sal,ev);
			
			ms_message("Receiving REFER request !");
			process_refer(sal,op,ev);
		}else if(MSG_IS_NOTIFY(ev->request)){
			process_notify(sal,ev);
		}else if (MSG_IS_OPTIONS(ev->request)){
			eXosip_lock();
			eXosip_call_build_answer(ev->tid,200,&ans);
			if (ans){
				fill_options_answer(ans);
				eXosip_call_send_answer(ev->tid,200,ans);
			}
			eXosip_unlock();
		}
	}else ms_warning("call_message_new: No request ?");
}

static void inc_update(Sal *sal, eXosip_event_t *ev){
	osip_message_t *msg=NULL;
	ms_message("Processing incoming UPDATE");
	eXosip_lock();
	eXosip_message_build_answer(ev->tid,200,&msg);
	if (msg!=NULL)
		eXosip_message_send_answer(ev->tid,200,msg);
	eXosip_unlock();
}

static bool_t comes_from_local_if(osip_message_t *msg){
	osip_via_t *via=NULL;
	osip_message_get_via(msg,0,&via);
	if (via){
		const char *host;
		host=osip_via_get_host(via);
		if (strcmp(host,"127.0.0.1")==0 || strcmp(host,"::1")==0){
			osip_generic_param_t *param=NULL;
			osip_via_param_get_byname(via,"received",&param);
			if (param==NULL) return TRUE;
			if (param->gvalue &&
				(strcmp(param->gvalue,"127.0.0.1")==0 || strcmp(param->gvalue,"::1")==0)){
				return TRUE;
			}
		}
	}
	return FALSE;
}

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static const char *days[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
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static const char *months[]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};

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static int utc_offset() {
	time_t ref = 24 * 60 * 60L;
	struct tm * timeptr;
	int gmtime_hours;

	/* get the local reference time for Jan 2, 1900 00:00 UTC */
	timeptr = localtime(&ref);
	gmtime_hours = timeptr->tm_hour;

	/* if the local time is the "day before" the UTC, subtract 24 hours
	from the hours to get the UTC offset */
	if (timeptr->tm_mday < 2) gmtime_hours -= 24;

	return gmtime_hours;
}

time_t mktime_utc(struct tm *timeptr) {
	return mktime(timeptr) + utc_offset() * 3600;
}

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static void text_received(Sal *sal, eXosip_event_t *ev){
	osip_body_t *body=NULL;
	char *from=NULL,*msg=NULL;
	osip_content_type_t* content_type;
	osip_uri_param_t* external_body_url; 
	char unquoted_external_body_url [256];
	int external_body_size=0;
	SalMessage salmsg;
	char message_id[256]={0};
	osip_header_t *date=NULL;
	struct tm ret={0};
	char tmp1[80]={0};
	char tmp2[80]={0};
	SalOp *op=sal_op_new(sal);

	osip_message_get_date(ev->request,0,&date);
	if(date!=NULL){
		int i,j;
		sscanf(date->hvalue,"%3c,%d%s%d%d:%d:%d",tmp1,&ret.tm_mday,tmp2,
	             &ret.tm_year,&ret.tm_hour,&ret.tm_min,&ret.tm_sec);
		ret.tm_year-=1900;
		for(i=0;i<7;i++) { 
			if(strcmp(tmp1,days[i])==0) ret.tm_wday=i; 
		}
		for(j=0;j<12;j++) { 
			if(strcmp(tmp2,months[j])==0) ret.tm_mon=j; 
		}
Simon Morlat's avatar
Simon Morlat committed
1822
		ret.tm_isdst=0;
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	}else ms_warning("No date header in SIP MESSAGE, we don't know when it was sent.");
	
	content_type= osip_message_get_content_type(ev->request);
	if (!content_type) {
		ms_error("Could not get message because no content type");
		return;
	}
	osip_from_to_str(ev->request->from,&from);
	if (content_type->type 
		&& strcmp(content_type->type, "text")==0 
		&& content_type->subtype
		&& strcmp(content_type->subtype, "plain")==0 ) {
		osip_message_get_body(ev->request,0,&body);
		if (body==NULL){
			ms_error("Could not get text message from SIP body");
			osip_free(from);
			return;
		}
		msg=body->body;
	}else if (content_type->type 
		  && strcmp(content_type->type, "message")==0 
		  && content_type->subtype
		  && strcmp(content_type->subtype, "external-body")==0 ) {
		
		osip_content_type_param_get_byname(content_type, "URL", &external_body_url);
		/*remove both first and last character*/
		strncpy(unquoted_external_body_url
				,&external_body_url->gvalue[1]
				,external_body_size=MIN(strlen(external_body_url->gvalue)-1,sizeof(unquoted_external_body_url)));
		unquoted_external_body_url[external_body_size-1]='\0';
	} else {
		ms_warning("Unsupported content type [%s/%s]",content_type->type,content_type->subtype);
		osip_free(from);
		return;
	}
	sal_op_set_custom_header(op,sal_exosip_get_custom_headers(ev->request));
	
	snprintf(message_id,sizeof(message_id)-1,"%s%s",ev->request->call_id->number,ev->request->cseq->number);
	
	salmsg.from=from;
	salmsg.text=msg;
	salmsg.url=external_body_size>0 ? unquoted_external_body_url : NULL;
	salmsg.message_id=message_id;
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	salmsg.time=date!=NULL ? mktime_utc(&ret) : time(NULL);
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