#if HAVE_CRT
#define _CRTDBG_MAP_ALLOC 
#include <stdlib.h> 
#include <crtdbg.h>
#endif //HAVE_CRT
/*
* Copyright (C) 2020, University of the Basque Country (UPV/EHU)
* Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
*
* The original file was part of Open Source Doubango Framework
* Copyright (C) 2010-2011 Mamadou Diop.
* Copyright (C) 2012 Doubango Telecom <http://doubango.org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/

#include "tnet_ice_candidate.h"
#include "tnet_ice_utils.h"
#include "tnet_utils.h"
#include "turn/tnet_turn_session.h"

#include "tsk_md5.h"
#include "tsk_memory.h"
#include "tsk_list.h"
#include "tsk_string.h"
#include "tsk_debug.h"

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

static int _tnet_ice_candidate_tostring(
	uint8_t* foundation,
	uint32_t comp_id,
	const char* transport_str,
	uint32_t priority,
	const char* connection_addr,
	tnet_port_t port,
	const char* cand_type_str,
	const tsk_params_L_t *extension_att_list,
	char** output);
static const char* _tnet_ice_candidate_get_foundation(tnet_ice_cand_type_t type);
static tnet_stun_pkt_t * _tnet_ice_candidate_stun_create_bind_request(tnet_ice_candidate_t* self, const char* username, const char* password);
static tsk_bool_t _tnet_ice_candidate_stun_transac_id_equals(const tnet_stun_transac_id_t id1, const tnet_stun_transac_id_t id2);
static const char* _tnet_ice_candidate_get_transport_str(tnet_socket_type_t transport_e);
static tnet_socket_type_t _tnet_ice_candidate_get_transport_type(tsk_bool_t ipv6, const char* transport_str);
static const char* _tnet_ice_candidate_get_candtype_str(tnet_ice_cand_type_t candtype_e);
static tnet_ice_cand_type_t _tnet_ice_candtype_get_transport_type(const char* candtype_str);

static tsk_object_t* tnet_ice_candidate_ctor(tsk_object_t * self, va_list * app)
{
	tnet_ice_candidate_t *candidate = self;
	if (candidate){
		candidate->extension_att_list = tsk_list_create();
	}
	return self;
}

static tsk_object_t* tnet_ice_candidate_dtor(tsk_object_t * self)
{
	tnet_ice_candidate_t *candidate = self;
	if (candidate){
		TSK_SAFE_FREE(candidate->transport_str);
		TSK_SAFE_FREE(candidate->cand_type_str);
		TSK_OBJECT_SAFE_FREE(candidate->extension_att_list);
		TSK_OBJECT_SAFE_FREE(candidate->socket);


		TSK_SAFE_FREE(candidate->stun.nonce);
		TSK_SAFE_FREE(candidate->stun.realm);
		TSK_SAFE_FREE(candidate->stun.srflx_addr);

		TSK_SAFE_FREE(candidate->turn.relay_addr);
		TSK_OBJECT_SAFE_FREE(candidate->turn.ss);

		TSK_SAFE_FREE(candidate->ufrag);
		TSK_SAFE_FREE(candidate->pwd);

		TSK_SAFE_FREE(candidate->tostring);
	}
	return self;
}

static int tnet_ice_candidate_cmp(const tsk_object_t *_s1, const tsk_object_t *_s2)
{
	const tnet_ice_candidate_t *c1 = _s1;
	const tnet_ice_candidate_t *c2 = _s2;

	if (c1 && c2){
		return (int)(c1->priority - c2->priority);
	}
	else if (!c1 && !c2) return 0;
	else return -1;
}

static const tsk_object_def_t tnet_ice_candidate_def_s =
{
	sizeof(tnet_ice_candidate_t),
	tnet_ice_candidate_ctor,
	tnet_ice_candidate_dtor,
	tnet_ice_candidate_cmp,
};

tnet_ice_candidate_t* tnet_ice_candidate_create(tnet_ice_cand_type_t type_e, tnet_socket_t* socket, tsk_bool_t is_ice_jingle, tsk_bool_t is_rtp, tsk_bool_t is_video, const char* ufrag, const char* pwd, const char *foundation)
{
	tnet_ice_candidate_t* candidate;

	if (!(candidate = tsk_object_new(&tnet_ice_candidate_def_s))){
		TSK_DEBUG_ERROR("Failed to create candidate");
		return tsk_null;
	}

	candidate->type_e = type_e;
	candidate->socket = tsk_object_ref(socket);
	candidate->local_pref = 0xFFFF;
	candidate->is_ice_jingle = is_ice_jingle;
	candidate->is_rtp = is_rtp;
	candidate->is_video = is_video;
	candidate->comp_id = is_rtp ? TNET_ICE_CANDIDATE_COMPID_RTP : TNET_ICE_CANDIDATE_COMPID_RTCP;
	if (foundation){
		memcpy(candidate->foundation, foundation, TSK_MIN(tsk_strlen(foundation), TNET_ICE_CANDIDATE_FOUND_SIZE_PREF));
	}
	else{
		tnet_ice_utils_compute_foundation((char*)candidate->foundation, TSK_MIN(sizeof(candidate->foundation), TNET_ICE_CANDIDATE_FOUND_SIZE_PREF));
	}
	candidate->priority = tnet_ice_utils_get_priority(candidate->type_e, candidate->local_pref, candidate->is_rtp);
	if (candidate->socket){
		memcpy(candidate->connection_addr, candidate->socket->ip, sizeof(candidate->socket->ip));
		candidate->port = candidate->socket->port;
		candidate->transport_e = socket->type;
	}
	tnet_ice_candidate_set_credential(candidate, ufrag, pwd);

	return candidate;
}

// @param str e.g. "1 1 udp 1 192.168.196.1 57806 typ host name video_rtcp network_name {0C0137CC-DB78-46B6-9B6C-7E097FFA79FE} username StFEVThMK2DHThkv password qkhKUDr4WqKRwZTo generation 0"
tnet_ice_candidate_t* tnet_ice_candidate_parse(const char* str)
{
	char *v, *copy, *saveptr;
	int32_t k;
	tnet_ice_candidate_t* candidate;

	if (tsk_strnullORempty(str)){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}

	if (!(candidate = tsk_object_new(&tnet_ice_candidate_def_s))){
		TSK_DEBUG_ERROR("Failed to create candidate");
		return tsk_null;
	}

	k = 0;
	copy = tsk_strdup(str);
	v = tsk_strtok_r(copy, " ", &saveptr);

	while (v){
		switch (k){
		case 0:
		{
			memcpy(candidate->foundation, v, TSK_MIN(tsk_strlen(v), sizeof(candidate->foundation)));
			break;
		}
		case 1:
		{
			candidate->comp_id = atoi(v);
			break;
		}
		case 2:
		{
			candidate->transport_str = tsk_strdup(v);
			break;
		}
		case 3:
		{
			candidate->priority = atoi(v);
			break;
		}
		case 4:
		{
			memcpy(candidate->connection_addr, v, TSK_MIN(tsk_strlen(v), sizeof(candidate->connection_addr)));
			break;
		}
		case 5:
		{
			tnet_family_t family;
			candidate->port = atoi(v);
			family = tnet_get_family(candidate->connection_addr, candidate->port);
			candidate->transport_e = _tnet_ice_candidate_get_transport_type((family == AF_INET6), candidate->transport_str);
			break;
		}
		case 6:
		{
			v = tsk_strtok_r(tsk_null, " ", &saveptr);
			tsk_strupdate(&candidate->cand_type_str, v);
			candidate->type_e = _tnet_ice_candtype_get_transport_type(v);
			break;
		}
		default:
		{
			const char* name = v;
			const char* value = (v = tsk_strtok_r(tsk_null, " ", &saveptr));
			tsk_param_t* param = tsk_param_create(name, value);
			if (param){
				tsk_list_push_back_data(candidate->extension_att_list, (void**)&param);
			}
			break;
		}
		}

		++k;
		v = tsk_strtok_r(tsk_null, " ", &saveptr);
	}

	if (k < 6){
		TSK_DEBUG_ERROR("Failed to parse: %s", str);
		TSK_OBJECT_SAFE_FREE(candidate);
	}
	TSK_FREE(copy);

	return candidate;
}

int tnet_ice_candidate_set_credential(tnet_ice_candidate_t* self, const char* ufrag, const char* pwd)
{
	if (!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	tsk_strupdate(&self->ufrag, ufrag);
	tsk_strupdate(&self->pwd, pwd);

	return 0;
}

int tnet_ice_candidate_set_rflx_addr(tnet_ice_candidate_t* self, const char* addr, tnet_port_t port)
{
	if (!self || !addr || !port){
		TSK_DEBUG_ERROR("Invalid argument");
		return -1;
	}
	memset(self->connection_addr, 0, sizeof(self->connection_addr));
	memcpy(self->connection_addr, addr, TSK_MIN(tsk_strlen(addr), sizeof(self->connection_addr)));
	self->port = port;
	return 0;
}

const char* tnet_ice_candidate_get_att_value(const tnet_ice_candidate_t* self, const char* att_name)
{
	if (!self || !att_name){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}
	return tsk_params_get_param_value(self->extension_att_list, att_name);
}

int tnet_ice_candidate_set_local_pref(tnet_ice_candidate_t* self, uint16_t local_pref)
{
	if (!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}
	self->local_pref = local_pref;
	self->priority = tnet_ice_utils_get_priority(self->type_e, self->local_pref, self->is_rtp);
	return 0;
}

const char* tnet_ice_candidate_tostring(tnet_ice_candidate_t* self)
{
	const char* _transport_str;
	char __str[16]; // always allocated: bad idea :(

	if (!self){
		TSK_DEBUG_ERROR("Invalid argument");
		return tsk_null;
	}

	if (self->type_e == tnet_ice_cand_type_relay && self->turn.ss) {
		enum tnet_turn_transport_e e_req_transport = tnet_turn_transport_udp;
		tnet_turn_session_get_req_transport(self->turn.ss, &e_req_transport);
		_transport_str = (e_req_transport == tnet_turn_transport_tcp) ? "tcp" : "udp";
	}
	else {
		_transport_str = self->transport_str ? self->transport_str : _tnet_ice_candidate_get_transport_str(self->transport_e);
		if (self->is_ice_jingle){
			tsk_size_t i, s = tsk_strlen(_transport_str);
			memset(__str, 0, sizeof(__str));
			for (i = 0; i < s && i < sizeof(__str) / sizeof(__str[0]); ++i){
				__str[i] = tolower(_transport_str[i]);
			}
			_transport_str = &__str[0];
		}
	}

	_tnet_ice_candidate_tostring(
		self->foundation,
		self->comp_id,
		_transport_str,
		self->priority,
		(tsk_strnullORempty(self->connection_addr) && self->socket) ? self->socket->ip : self->connection_addr,
		(self->port <= 0 && self->socket) ? self->socket->port : self->port,
		self->cand_type_str ? self->cand_type_str : _tnet_ice_candidate_get_candtype_str(self->type_e),
		self->extension_att_list,
		&self->tostring);

	/* <rel-addr> and <rel-port>:  convey transport addresses related to the
	  candidate, useful for diagnostics and other purposes. <rel-addr>
	  and <rel-port> MUST be present for server reflexive, peer
	  reflexive, and relayed candidates. */
	switch (self->type_e){
	case tnet_ice_cand_type_srflx:
	case tnet_ice_cand_type_prflx:
	case tnet_ice_cand_type_relay:
	{
		if (self->socket){ // when called from the browser(IE, Safari, Opera or Firefox) webrtc4all
			tsk_strcat_2(&self->tostring, " raddr %s rport %d", self->socket->ip, self->socket->port);
		}
		break;
	}
	default:
	{
		break;
	}
	}

	// WebRTC (Chrome) specific
	if (self->is_ice_jingle){
		if (!tsk_params_have_param(self->extension_att_list, "name")){
			tsk_strcat_2(&self->tostring, " name %s", self->is_rtp ? (self->is_video ? "video_rtp" : "rtp") : (self->is_video ? "video_rtcp" : "rtcp"));
		}
		if (!tsk_params_have_param(self->extension_att_list, "username")){
			tsk_strcat_2(&self->tostring, " username %s", self->ufrag);
		}
		if (!tsk_params_have_param(self->extension_att_list, "password")){
			tsk_strcat_2(&self->tostring, " password %s", self->pwd);
		}
		if (!tsk_params_have_param(self->extension_att_list, "network_name")){
			tsk_strcat_2(&self->tostring, " network_name %s", "{9EBBE687-CCE6-42D3-87F5-B57BB30DEE23}");
		}
		if (!tsk_params_have_param(self->extension_att_list, "generation")){
			tsk_strcat_2(&self->tostring, " generation %s", "0");
		}
	}

	return self->tostring;
}

int tnet_ice_candidate_send_stun_bind_request(tnet_ice_candidate_t* self, const struct sockaddr_storage* server_addr, const char* username, const char* password)
{
	tnet_stun_pkt_t *request = tsk_null;
	tsk_buffer_t *buffer = tsk_null;
	int ret, sendBytes;

	if (!self || !server_addr || !TNET_SOCKET_IS_VALID(self->socket)){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	request = _tnet_ice_candidate_stun_create_bind_request(self, username, password);
	if (!request){
		TSK_DEBUG_ERROR("Failed to create STUN request");
		ret = -2;
		goto bail;
	}

	if ((ret = tnet_stun_pkt_write_with_padding_2(request, &buffer))){
		TSK_DEBUG_ERROR("Failed to serialize STUN request");
		goto bail;
	}

	sendBytes = tnet_sockfd_sendto(self->socket->fd, (const struct sockaddr*)server_addr, buffer->data, buffer->size);// return number of sent bytes
	if (sendBytes == buffer->size){
		memcpy(self->stun.transac_id, request->transac_id, sizeof(tnet_stun_transac_id_t));
		ret = 0;
	}
	else{
		TSK_DEBUG_ERROR("Only %d bytes sent", sendBytes);
		ret = -4;
		goto bail;
	}

bail:
	TSK_OBJECT_SAFE_FREE(request);
	TSK_OBJECT_SAFE_FREE(buffer);

	return 0;
}

int tnet_ice_candidate_process_stun_response(tnet_ice_candidate_t* self, const tnet_stun_pkt_resp_t* response, tnet_fd_t fd)
{
	int ret = 0;

	if (!self || !response){
		TSK_DEBUG_ERROR("Inavlid parameter");
		return -1;
	}

	//if(!(_tnet_ice_candidate_stun_transac_id_equals(response->transac_id, self->stun.transac_id))){
	//	TSK_DEBUG_ERROR("Transaction id mismatch");
	//	return -2;
	//}

	if (TNET_STUN_PKT_RESP_IS_ERROR(response)) {
		uint16_t u_code;
		if ((ret = tnet_stun_pkt_get_errorcode(response, &u_code))) {
			return ret;
		}
		if (u_code == kStunErrCodeUnauthorized || u_code == kStunErrCodeStaleNonce) {
			const tnet_stun_attr_vdata_t* pc_attr;
			if (u_code == kStunErrCodeUnauthorized) {
				// Make sure this is not an authentication failure (#2 401)
				// Do not send another req to avoid endless messages
				if ((tnet_stun_pkt_attr_exists(response, tnet_stun_attr_type_message_integrity))) { // already has a MESSAGE-INTEGRITY?
					TSK_DEBUG_ERROR("TURN authentication failed");
					return -3;
				}
			}
			if ((ret = tnet_stun_pkt_attr_find_first(response, tnet_stun_attr_type_nonce, (const tnet_stun_attr_t**)&pc_attr)) == 0 && pc_attr) {
				tsk_strupdate(&self->stun.nonce, pc_attr->p_data_ptr);
			}
			if ((ret = tnet_stun_pkt_attr_find_first(response, tnet_stun_attr_type_realm, (const tnet_stun_attr_t**)&pc_attr)) == 0 && pc_attr) {
				tsk_strupdate(&self->stun.realm, pc_attr->p_data_ptr);
			}
			return 0;
		}
		else {
			TSK_DEBUG_ERROR("STUN error: %hu", u_code);
			return -4;
		}
	}
	else if (TNET_STUN_PKT_RESP_IS_SUCCESS(response)) {
		const tnet_stun_attr_address_t* pc_attr_addr;
		if (((ret = tnet_stun_pkt_attr_find_first(response, tnet_stun_attr_type_xor_mapped_address, (const tnet_stun_attr_t**)&pc_attr_addr)) == 0 && pc_attr_addr)
			|| ((ret = tnet_stun_pkt_attr_find_first(response, tnet_stun_attr_type_mapped_address, (const tnet_stun_attr_t**)&pc_attr_addr)) == 0 && pc_attr_addr)) {
			tnet_ip_t ip;
			if ((ret = tnet_stun_utils_inet_ntop((pc_attr_addr->e_family == tnet_stun_address_family_ipv6), &pc_attr_addr->address, &ip))) {
				return ret;
			}
			tsk_strupdate(&self->stun.srflx_addr, ip);
			self->stun.srflx_port = pc_attr_addr->u_port;
		}
	}

	return ret;
}

const tnet_ice_candidate_t* tnet_ice_candidate_find_by_fd(tnet_ice_candidates_L_t* candidates, tnet_fd_t fd)
{
	if (candidates){
		const tsk_list_item_t *item;
		const tnet_ice_candidate_t* candidate;

		tsk_list_lock(candidates);
		tsk_list_foreach(item, candidates){
			if (!(candidate = item->data)){
				continue;
			}
			if (candidate->socket && (candidate->socket->fd == fd)){
				tsk_list_unlock(candidates);
				return candidate;
			}
		}
	}

	return tsk_null;
}

const char* tnet_ice_candidate_get_ufrag(const tnet_ice_candidate_t* self)
{
	if (self){
		return self->ufrag ? self->ufrag : tnet_ice_candidate_get_att_value(self, "username");
	}
	return tsk_null;
}

const char* tnet_ice_candidate_get_pwd(const tnet_ice_candidate_t* self)
{
	if (self){
		return self->pwd ? self->pwd : tnet_ice_candidate_get_att_value(self, "password");
	}
	return tsk_null;
}

static int _tnet_ice_candidate_tostring(
	uint8_t* foundation,
	uint32_t comp_id,
	const char* transport_str,
	uint32_t priority,
	const char* connection_addr,
	tnet_port_t port,
	const char* cand_type_str,
	const tsk_params_L_t *extension_att_list,
	char** output)
{
	if (!output){
		TSK_DEBUG_ERROR("Invalid argument");
		return -1;
	}
	tsk_sprintf(output, "%s %d %s %d %s %d typ %s",
		foundation,
		comp_id,
		transport_str,
		priority,
		connection_addr,
		port,
		cand_type_str);

	if (extension_att_list){
		const tsk_list_item_t *item;
		tsk_list_foreach(item, extension_att_list){
			tsk_strcat_2(output, " %s %s", TSK_PARAM(item->data)->name, TSK_PARAM(item->data)->value);
		}
	}
	return 0;
}

static const char* _tnet_ice_candidate_get_foundation(tnet_ice_cand_type_t type)
{
	switch (type){
	case tnet_ice_cand_type_host: return TNET_ICE_CANDIDATE_FOUNDATION_HOST;
	case tnet_ice_cand_type_srflx: return TNET_ICE_CANDIDATE_FOUNDATION_SRFLX;
	case tnet_ice_cand_type_prflx: return TNET_ICE_CANDIDATE_FOUNDATION_PRFLX;
	case tnet_ice_cand_type_relay: default: return TNET_ICE_CANDIDATE_FOUNDATION_RELAY;
	}
}


static tsk_bool_t _tnet_ice_candidate_stun_transac_id_equals(const tnet_stun_transac_id_t id1, const tnet_stun_transac_id_t id2)
{
	tsk_size_t i;
	static const tsk_size_t size = sizeof(tnet_stun_transac_id_t);
	for (i = 0; i < size; i++){
		if (id1[i] != id2[i]){
			return tsk_false;
		}
	}
	return tsk_true;
}

static tnet_stun_pkt_t * _tnet_ice_candidate_stun_create_bind_request(tnet_ice_candidate_t* self, const char* username, const char* password)
{
	tnet_stun_pkt_t *request = tsk_null;
	int ret;

	if (!self) {
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}

	if ((ret = tnet_stun_pkt_create_empty(tnet_stun_pkt_type_binding_request, &request))) {
		TSK_DEBUG_ERROR("Failed to create STUN Bind request");
		goto bail;
	}
	// add attributes
	request->opt.dontfrag = 0;
	ret = tnet_stun_pkt_attrs_add(request,
		TNET_STUN_PKT_ATTR_ADD_SOFTWARE_ZT(kStunSoftware),
		TNET_STUN_PKT_ATTR_ADD_NULL());
	if (ret) {
		goto bail;
	}
	if (username && self->stun.realm && self->stun.nonce) {
		if ((ret = tnet_stun_pkt_auth_prepare(request, username, password, self->stun.realm, self->stun.nonce))) {
			goto bail;
		}
	}

bail:
	if (ret) {
		TSK_OBJECT_SAFE_FREE(request);
	}
	return request;
}

static const char* _tnet_ice_candidate_get_transport_str(tnet_socket_type_t transport_e)
{
#define TRANSPORT_GET(STR) \
	if(TNET_SOCKET_TYPE_IS_##STR(transport_e)){ \
		return TNET_ICE_CANDIDATE_TRANSPORT_##STR; \
		}
	TRANSPORT_GET(UDP);
	TRANSPORT_GET(TCP);
	TRANSPORT_GET(TLS);
	TRANSPORT_GET(SCTP);
	TRANSPORT_GET(WS);
	TRANSPORT_GET(WSS);
	return "UNKNOWN";

#undef TRANSPORT_GET
}

static tnet_socket_type_t _tnet_ice_candidate_get_transport_type(tsk_bool_t ipv6, const char* transport_str)
{
#define TRANSPORT_GET(STR, str) \
	if(tsk_striequals(TNET_ICE_CANDIDATE_TRANSPORT_##STR, transport_str)){ \
		return tnet_socket_type_##str##_ipv4; \
		}

	TRANSPORT_GET(UDP, udp);
	TRANSPORT_GET(TCP, tcp);
	TRANSPORT_GET(TLS, tls);
	TRANSPORT_GET(SCTP, sctp);
	TRANSPORT_GET(WS, ws);
	TRANSPORT_GET(WSS, wss);
	return tnet_socket_type_invalid;

#undef TRANSPORT_GET
}

static const char* _tnet_ice_candidate_get_candtype_str(tnet_ice_cand_type_t candtype_e)
{
	switch (candtype_e){
	case tnet_ice_cand_type_unknown:
	default: return "unknown";
	case tnet_ice_cand_type_host: return TNET_ICE_CANDIDATE_TYPE_HOST;
	case tnet_ice_cand_type_srflx: return TNET_ICE_CANDIDATE_TYPE_SRFLX;
	case tnet_ice_cand_type_prflx: return TNET_ICE_CANDIDATE_TYPE_PRFLX;
	case tnet_ice_cand_type_relay: return TNET_ICE_CANDIDATE_TYPE_RELAY;
	}
}

static tnet_ice_cand_type_t _tnet_ice_candtype_get_transport_type(const char* candtype_str)
{
	if (tsk_striequals(TNET_ICE_CANDIDATE_TYPE_HOST, candtype_str)){
		return tnet_ice_cand_type_host;
	}
	else if (tsk_striequals(TNET_ICE_CANDIDATE_TYPE_SRFLX, candtype_str)){
		return tnet_ice_cand_type_srflx;
	}
	else if (tsk_striequals(TNET_ICE_CANDIDATE_TYPE_PRFLX, candtype_str)){
		return tnet_ice_cand_type_prflx;
	}
	else if (tsk_striequals(TNET_ICE_CANDIDATE_TYPE_RELAY, candtype_str)){
		return tnet_ice_cand_type_relay;
	}
	else{
		return tnet_ice_cand_type_unknown;
	}
}