static uint32_t calc_prio(enum ice_cand_type type, int proto, enum ice_tcptype tcptype, int af, int turn_proto) { uint16_t lpref = 0; switch (proto) { case IPPROTO_UDP: if (af==AF_INET6) lpref = turn_proto==IPPROTO_UDP ? 65535 : 65533; else lpref = turn_proto==IPPROTO_UDP ? 65534 : 65532; break; case IPPROTO_TCP: lpref = local_tcp_preference(tcptype, af==AF_INET6); break; } return ice_cand_calc_prio(type, lpref, COMPID); }
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; }