/**
* Computing States
*/
static void candpair_set_states(struct icem *icem)
{
struct le *le, *le2;
/*
For all pairs with the same foundation, it sets the state of
the pair with the lowest component ID to Waiting. If there is
more than one such pair, the one with the highest priority is
used.
*/
for (le = icem->checkl.head; le; le = le->next) {
struct candpair *cp = le->data;
for (le2 = icem->checkl.head; le2; le2 = le2->next) {
struct candpair *cp2 = le2->data;
if (!icem_candpair_cmp_fnd(cp, cp2))
continue;
if (cp2->lcand->compid < cp->lcand->compid &&
cp2->pprio > cp->pprio)
cp = cp2;
}
icem_candpair_set_state(cp, CANDPAIR_WAITING);
}
}
void icem_candpair_failed(struct candpair *cp, int err, uint16_t scode)
{
if (!cp)
return;
cp->err = err;
cp->scode = scode;
cp->valid = false;
icem_candpair_set_state(cp, CANDPAIR_FAILED);
}
void icem_candpair_make_valid(struct candpair *cp)
{
if (!cp)
return;
cp->err = 0;
cp->scode = 0;
cp->valid = true;
if (cp->usec_sent)
cp->ertt = (long)(ice_get_usec() - cp->usec_sent);
icem_candpair_set_state(cp, CANDPAIR_SUCCEEDED);
list_unlink(&cp->le);
list_add_sorted(&cp->icem->validl, cp);
}
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
}
}
int icem_conncheck_send(struct ice_candpair *cp, bool use_cand, bool trigged)
{
struct ice_cand *lcand = cp->lcand;
struct icem *icem = cp->icem;
char username_buf[64];
size_t presz = 0;
uint32_t prio_prflx;
uint16_t ctrl_attr;
int err = 0;
icem_candpair_set_state(cp, ICE_CANDPAIR_INPROGRESS);
(void)re_snprintf(username_buf, sizeof(username_buf),
"%s:%s", icem->rufrag, icem->lufrag);
/* PRIORITY and USE-CANDIDATE */
prio_prflx = ice_cand_calc_prio(ICE_CAND_TYPE_PRFLX, 0, lcand->compid);
switch (icem->lrole) {
case ICE_ROLE_CONTROLLING:
ctrl_attr = STUN_ATTR_CONTROLLING;
if (icem->conf.nom == ICE_NOMINATION_AGGRESSIVE)
use_cand = true;
break;
case ICE_ROLE_CONTROLLED:
ctrl_attr = STUN_ATTR_CONTROLLED;
break;
default:
return EINVAL;
}
#if ICE_TRACE
icecomp_printf(cp->comp, "Tx %H ---> %H (%s) %s %s\n",
icem_cand_print, cp->lcand, icem_cand_print, cp->rcand,
ice_candpair_state2name(cp->state),
use_cand ? "[USE]" : "",
trigged ? "[Trigged]" : "");
#else
(void)trigged;
#endif
/* A connectivity check MUST utilize the STUN short term credential
mechanism. */
/* The password is equal to the password provided by the peer */
if (!icem->rpwd) {
DEBUG_WARNING("no remote password!\n");
}
if (cp->ct_conn) {
DEBUG_WARNING("send_req: CONNCHECK already Pending!\n");
return EBUSY;
}
switch (lcand->type) {
case ICE_CAND_TYPE_RELAY:
/* Creating Permissions for Relayed Candidates */
err = turnc_add_chan(cp->comp->turnc, &cp->rcand->addr,
NULL, NULL);
if (err) {
DEBUG_WARNING("add channel: %m\n", err);
break;
}
presz = 4;
/*@fallthrough@*/
case ICE_CAND_TYPE_HOST:
case ICE_CAND_TYPE_SRFLX:
case ICE_CAND_TYPE_PRFLX:
cp->ct_conn = mem_deref(cp->ct_conn);
err = stun_request(&cp->ct_conn, icem->stun, icem->proto,
cp->comp->sock, &cp->rcand->addr, presz,
STUN_METHOD_BINDING,
(uint8_t *)icem->rpwd, str_len(icem->rpwd),
true, stunc_resp_handler, cp,
4,
STUN_ATTR_USERNAME, username_buf,
STUN_ATTR_PRIORITY, &prio_prflx,
ctrl_attr, &icem->tiebrk,
STUN_ATTR_USE_CAND,
use_cand ? &use_cand : 0);
break;
default:
DEBUG_WARNING("unknown candidate type %d\n", lcand->type);
err = EINVAL;
break;
}
return err;
}
