int nr_ice_candidate_pair_create(nr_ice_peer_ctx *pctx, nr_ice_candidate *lcand,nr_ice_candidate *rcand,nr_ice_cand_pair **pairp)
{
nr_ice_cand_pair *pair=0;
UINT8 o_priority, a_priority;
int r,_status;
UINT4 RTO;
nr_ice_candidate tmpcand;
UINT8 t_priority;
if(!(pair=RCALLOC(sizeof(nr_ice_cand_pair))))
ABORT(R_NO_MEMORY);
pair->pctx=pctx;
nr_ice_candidate_pair_compute_codeword(pair,lcand,rcand);
if(r=nr_concat_strings(&pair->as_string,pair->codeword,"|",lcand->addr.as_string,"|",
rcand->addr.as_string,"(",lcand->label,"|",rcand->label,")", NULL))
ABORT(r);
nr_ice_candidate_pair_set_state(pctx,pair,NR_ICE_PAIR_STATE_FROZEN);
pair->local=lcand;
pair->remote=rcand;
/* Priority computation S 5.7.2 */
if(pctx->ctx->flags & NR_ICE_CTX_FLAGS_OFFERER)
{
assert(!(pctx->ctx->flags & NR_ICE_CTX_FLAGS_ANSWERER));
o_priority=lcand->priority;
a_priority=rcand->priority;
}
else{
o_priority=rcand->priority;
a_priority=lcand->priority;
}
pair->priority=(MIN(o_priority, a_priority))<<32 |
(MAX(o_priority, a_priority))<<1 | (o_priority > a_priority?0:1);
/*
TODO([email protected]): Would be nice to log why this candidate was
created (initial pair generation, triggered check, and new trickle
candidate seem to be the possibilities here).
*/
r_log(LOG_ICE,LOG_INFO,"ICE(%s)/CAND-PAIR(%s): Pairing candidate %s (%x):%s (%x) priority=%llu (%llx)",pctx->ctx->label,pair->codeword,lcand->addr.as_string,lcand->priority,rcand->addr.as_string,rcand->priority,pair->priority,pair->priority);
/* Foundation */
if(r=nr_concat_strings(&pair->foundation,lcand->foundation,"|",
rcand->foundation,NULL))
ABORT(r);
/* Compute the RTO per S 16 */
RTO = MAX(100, (pctx->ctx->Ta * pctx->waiting_pairs));
/* Make a bogus candidate to compute a theoretical peer reflexive
* priority per S 7.1.1.1 */
memcpy(&tmpcand, lcand, sizeof(tmpcand));
tmpcand.type = PEER_REFLEXIVE;
if (r=nr_ice_candidate_compute_priority(&tmpcand))
ABORT(r);
t_priority = tmpcand.priority;
/* Our sending context */
if(r=nr_stun_client_ctx_create(pair->as_string,
lcand->osock,
&rcand->addr,RTO,&pair->stun_client))
ABORT(r);
if(!(pair->stun_client->params.ice_binding_request.username=r_strdup(rcand->stream->l2r_user)))
ABORT(R_NO_MEMORY);
if(r=r_data_copy(&pair->stun_client->params.ice_binding_request.password,
&rcand->stream->l2r_pass))
ABORT(r);
pair->stun_client->params.ice_binding_request.priority=t_priority;
/* TODO([email protected]): Do we need to frob this when we change role. Bug 890667 */
pair->stun_client->params.ice_binding_request.control = pctx->controlling?
NR_ICE_CONTROLLING:NR_ICE_CONTROLLED;
pair->stun_client->params.ice_use_candidate.priority=t_priority;
pair->stun_client->params.ice_binding_request.tiebreaker=pctx->tiebreaker;
*pairp=pair;
_status=0;
abort:
if(_status){
nr_ice_candidate_pair_destroy(&pair);
}
return(_status);
}
int nr_ice_candidate_pair_create(nr_ice_peer_ctx *pctx, nr_ice_candidate *lcand,nr_ice_candidate *rcand,nr_ice_cand_pair **pairp)
{
nr_ice_cand_pair *pair=0;
UINT8 o_priority, a_priority;
char *lufrag,*rufrag;
char *lpwd,*rpwd;
char *l2ruser=0,*r2lpass=0;
int r,_status;
UINT4 RTO;
nr_ice_candidate tmpcand;
UINT8 t_priority;
if(!(pair=RCALLOC(sizeof(nr_ice_cand_pair))))
ABORT(R_NO_MEMORY);
pair->pctx=pctx;
nr_ice_candidate_pair_compute_codeword(pair,lcand,rcand);
if(r=nr_concat_strings(&pair->as_string,pair->codeword,"|",lcand->addr.as_string,"|",
rcand->addr.as_string,"(",lcand->label,"|",rcand->label,")",0))
ABORT(r);
nr_ice_candidate_pair_set_state(pctx,pair,NR_ICE_PAIR_STATE_FROZEN);
pair->local=lcand;
pair->remote=rcand;
/* Priority computation S 5.7.2 */
if(pctx->ctx->flags & NR_ICE_CTX_FLAGS_OFFERER)
{
assert(!(pctx->ctx->flags & NR_ICE_CTX_FLAGS_ANSWERER));
o_priority=lcand->priority;
a_priority=rcand->priority;
}
else{
o_priority=rcand->priority;
a_priority=lcand->priority;
}
pair->priority=(MIN(o_priority, a_priority))<<32 |
(MAX(o_priority, a_priority))<<1 | (o_priority > a_priority?0:1);
r_log(LOG_ICE,LOG_DEBUG,"ICE(%s): Pairing candidate %s (%x):%s (%x) priority=%llu (%llx) codeword=%s",pctx->ctx->label,lcand->addr.as_string,lcand->priority,rcand->addr.as_string,rcand->priority,pair->priority,pair->priority,pair->codeword);
/* Foundation */
if(r=nr_concat_strings(&pair->foundation,lcand->foundation,"|",
rcand->foundation,0))
ABORT(r);
/* OK, now the STUN data */
lufrag=lcand->stream->ufrag?lcand->stream->ufrag:pctx->ctx->ufrag;
lpwd=lcand->stream->pwd?lcand->stream->pwd:pctx->ctx->pwd;
rufrag=rcand->stream->ufrag?rcand->stream->ufrag:pctx->peer_ufrag;
rpwd=rcand->stream->pwd?rcand->stream->pwd:pctx->peer_pwd;
/* Compute the RTO per S 16 */
RTO = MAX(100, (pctx->ctx->Ta * pctx->waiting_pairs));
/* Make a bogus candidate to compute a theoretical peer reflexive
* priority per S 7.1.1.1 */
memcpy(&tmpcand, lcand, sizeof(tmpcand));
tmpcand.type = PEER_REFLEXIVE;
if (r=nr_ice_candidate_compute_priority(&tmpcand))
ABORT(r);
t_priority = tmpcand.priority;
/* Our sending context */
if(r=nr_concat_strings(&l2ruser,lufrag,":",rufrag,0))
ABORT(r);
if(r=nr_stun_client_ctx_create(pair->as_string,
lcand->osock,
&rcand->addr,RTO,&pair->stun_client))
ABORT(r);
if(!(pair->stun_client->params.ice_binding_request.username=r_strdup(l2ruser)))
ABORT(R_NO_MEMORY);
if(r=r_data_make(&pair->stun_client->params.ice_binding_request.password,(UCHAR *)lpwd,strlen(lpwd)))
ABORT(r);
pair->stun_client->params.ice_binding_request.priority=t_priority;
pair->stun_client->params.ice_binding_request.control = pctx->controlling?
NR_ICE_CONTROLLING:NR_ICE_CONTROLLED;
pair->stun_client->params.ice_binding_request.tiebreaker=pctx->tiebreaker;
/* Our receiving username/passwords. Stash these for later
injection into the stun server ctx*/
if(r=nr_concat_strings(&pair->r2l_user,rufrag,":",lufrag,0))
ABORT(r);
if(!(r2lpass=r_strdup(rpwd)))
ABORT(R_NO_MEMORY);
INIT_DATA(pair->r2l_pwd,(UCHAR *)r2lpass,strlen(r2lpass));
*pairp=pair;
_status=0;
abort:
RFREE(l2ruser);
if(_status){
RFREE(r2lpass);
}
return(_status);
}
