/*
* 7.2.2. Additional Procedures for Lite Implementations
*/
static int handle_stun_lite(struct icem *icem,
struct icem_comp *comp, const struct sa *src,
bool use_cand)
{
struct cand *lcand, *rcand;
struct candpair *cp;
int err;
if (!use_cand)
return 0;
rcand = icem_cand_find(&icem->rcandl, comp->id, src);
if (!rcand) {
DEBUG_WARNING("lite: could not find remote candidate\n");
return 0;
}
/* find the local host candidate with the same component */
lcand = icem_cand_find(&icem->lcandl, comp->id, NULL);
if (!lcand) {
DEBUG_WARNING("lite: could not find local candidate\n");
return 0;
}
/* search validlist for existing candpair's */
if (icem_candpair_find(&icem->validl, lcand, rcand))
return 0;
err = icem_candpair_alloc(&cp, icem, lcand, rcand);
if (err) {
DEBUG_WARNING("lite: failed to created candidate pair\n");
return err;
}
icem_candpair_make_valid(cp);
cp->nominated = true;
return 0;
}
static void triggered_check(struct icem *icem, struct cand *lcand,
struct cand *rcand)
{
struct candpair *cp = NULL;
int err;
if (lcand && rcand)
cp = icem_candpair_find(&icem->checkl, lcand, rcand);
if (cp) {
icecomp_printf(cp->comp,
"triggered_check: found CandidatePair on"
" checklist in state: %H\n",
icem_candpair_debug, cp);
switch (cp->state) {
#if 0
/* TODO: I am not sure why we should cancel the
* pending Connectivity check here. this
* can lead to a deadlock situation where
* both agents are stuck on sending
* triggered checks on the same candidate pair
*/
case CANDPAIR_INPROGRESS:
icem_candpair_cancel(cp);
/*@fallthrough@*/
#endif
case CANDPAIR_FAILED:
icem_candpair_set_state(cp, CANDPAIR_WAITING);
/*@fallthrough@*/
case CANDPAIR_FROZEN:
case CANDPAIR_WAITING:
err = icem_conncheck_send(cp, false, true);
if (err) {
DEBUG_WARNING("triggered check failed\n");
}
break;
case CANDPAIR_SUCCEEDED:
default:
break;
}
}
else {
#if 0
err = icem_candpair_alloc(&cp, icem, lcand, rcand);
if (err) {
DEBUG_WARNING("failed to allocate candpair:"
" lcand=%p rcand=%p (%m)\n",
lcand, rcand, err);
return;
}
icem_candpair_prio_order(&icem->checkl);
icem_candpair_set_state(cp, CANDPAIR_WAITING);
(void)icem_conncheck_send(cp, false, true);
#endif
}
}
/**
* Constructing a Valid Pair
*
* @return The valid pair
*/
static struct ice_candpair *construct_valid_pair(struct icem *icem,
struct ice_candpair *cp,
const struct sa *mapped,
const struct sa *dest)
{
struct ice_cand *lcand, *rcand;
struct ice_candpair *cp2;
int err;
lcand = icem_cand_find(&icem->lcandl, cp->lcand->compid, mapped);
rcand = icem_cand_find(&icem->rcandl, cp->rcand->compid, dest);
if (!lcand) {
DEBUG_WARNING("no such local candidate: %J\n", mapped);
return NULL;
}
if (!rcand) {
DEBUG_WARNING("no such remote candidate: %J\n", dest);
return NULL;
}
/* New candidate? -- implicit success */
if (lcand != cp->lcand || rcand != cp->rcand) {
if (lcand != cp->lcand) {
icecomp_printf(cp->comp,
"New local candidate for mapped %J\n",
mapped);
}
if (rcand != cp->rcand) {
icecomp_printf(cp->comp,
"New remote candidate for dest %J\n",
dest);
}
/* The original candidate pair is set to 'Failed' because
* the implicitly discovered pair is 'better'.
* This happens for UAs behind NAT where the original
* pair is of type 'host' and the implicit pair is 'srflx'
*/
icem_candpair_make_valid(cp);
cp2 = icem_candpair_find(&icem->validl, lcand, rcand);
if (cp2)
return cp2;
err = icem_candpair_clone(&cp2, cp, lcand, rcand);
if (err)
return NULL;
icem_candpair_make_valid(cp2);
/*icem_candpair_failed(cp, EINTR, 0);*/
return cp2;
}
else {
/* Add to VALID LIST, the pair that generated the check */
icem_candpair_make_valid(cp);
return cp;
}
}