void icem_candpair_set_state(struct candpair *cp, enum candpair_state state)
{
if (!cp)
return;
if (cp->state != state) {
icecomp_printf(cp->comp,
"%5s <---> %5s FSM: %10s ===> %-10s\n",
ice_cand_type2name(cp->lcand->type),
ice_cand_type2name(cp->rcand->type),
ice_candpair_state2name(cp->state),
ice_candpair_state2name(state));
cp->state = state;
}
}
int icem_candpair_debug(struct re_printf *pf, const struct candpair *cp)
{
int err;
if (!cp)
return 0;
err = re_hprintf(pf, "{%u} %10s {%c%c%c} %28H <---> %28H",
cp->lcand->compid,
ice_candpair_state2name(cp->state),
cp->def ? 'D' : ' ',
cp->valid ? 'V' : ' ',
cp->nominated ? 'N' : ' ',
icem_cand_print, cp->lcand,
icem_cand_print, cp->rcand);
if (cp->ertt != -1)
err |= re_hprintf(pf, " ERTT = %.2fms", cp->ertt / 1000.0);
if (cp->err)
err |= re_hprintf(pf, " (%s)", strerror(cp->err));
if (cp->scode)
err |= re_hprintf(pf, " [%u]", cp->scode);
return err;
}
void icem_comp_set_selected(struct icem_comp *comp, struct candpair *cp)
{
if (!comp || !cp)
return;
if (cp->state != CANDPAIR_SUCCEEDED) {
DEBUG_WARNING("{%s.%u} set_selected: invalid state %s\n",
comp->icem->name, comp->id,
ice_candpair_state2name(cp->state));
}
mem_deref(comp->cp_sel);
comp->cp_sel = mem_ref(cp);
}
static int handle_stun(struct ice *ice, struct icem *icem,
struct icem_comp *comp, const struct sa *src,
uint32_t prio, bool use_cand, bool tunnel)
{
struct cand *lcand = NULL, *rcand;
struct candpair *cp = NULL;
int err;
rcand = icem_cand_find(&icem->rcandl, comp->id, src);
if (!rcand) {
err = icem_rcand_add_prflx(&rcand, icem, comp->id, prio, src);
if (err)
return err;
}
cp = icem_candpair_find_rcand(icem, rcand);
if (cp)
lcand = cp->lcand;
else
lcand = icem_lcand_find_checklist(icem, comp->id);
if (!lcand) {
DEBUG_WARNING("{%s.%u} no local candidate"
" (checklist=%u) (src=%J)\n",
icem->name, comp->id,
list_count(&icem->checkl), src);
return 0;
}
if (ICE_MODE_FULL == ice->lmode)
triggered_check(icem, lcand, rcand);
if (!cp) {
cp = icem_candpair_find_rcand(icem, rcand);
if (!cp) {
DEBUG_WARNING("{%s.%u} candidate pair not found:"
" source=%J\n",
icem->name, comp->id, src);
return 0;
}
}
#if ICE_TRACE
icecomp_printf(comp, "Rx Binding Request from %J via %s"
" (candpair=%s) %s\n",
src, tunnel ? "Tunnel" : "Socket",
cp ? ice_candpair_state2name(cp->state) : "n/a",
use_cand ? "[USE]" : "");
#else
(void)tunnel;
#endif
/* 7.2.1.5. Updating the Nominated Flag */
if (use_cand) {
if (ice->lrole == ROLE_CONTROLLED) {
if (cp->state == CANDPAIR_SUCCEEDED) {
cp->nominated = true;
icecomp_printf(comp, "setting NOMINATED"
" flag on candpair [%H]\n",
icem_candpair_debug, cp);
}
}
/* Cancel conncheck. Choose Selected Pair */
icem_candpair_make_valid(cp);
if (ice->conf.nom == ICE_NOMINATION_REGULAR) {
icem_candpair_cancel(cp);
icem_comp_set_selected(comp, cp);
}
}
return 0;
}
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;
}