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freeswitch/libs/sofia-sip/libsofia-sip-ua/stun/stun_common.c

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/*
* This file is part of the Sofia-SIP package
*
* Copyright (C) 2005 Nokia Corporation.
*
* Contact: Pekka Pessi <pekka.pessi@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
/**
* @file stun_common.c
* @brief
*
* @author Tat Chan <Tat.Chan@nokia.com>
* @author Kai Vehmanen <kai.vehmanen@nokia.com>
*
* @date Created: Fri Oct 3 13:40:41 2003 ppessi
*
*/
#include "config.h"
#ifdef USE_TURN
#include "../turn/turn_common.h"
#undef STUN_A_LAST_MANDATORY
#define STUN_A_LAST_MANDATORY TURN_LARGEST_ATTRIBUTE
#endif
#include "stun_internal.h"
#include <string.h>
#include <assert.h>
#if HAVE_FUNC
#elif HAVE_FUNCTION
#define __func__ __FUNCTION__
#else
#define __func__ "stun_common"
#endif
const char stun_400_Bad_request[] = "Bad Request",
stun_401_Unauthorized[] = "Unauthorized",
stun_420_Unknown_attribute[] = "Unknown Attribute",
stun_430_Stale_credentials[] = "Stale Credentials",
stun_431_Integrity_check_failure[] = "Integrity Check Failure",
stun_432_Missing_username[] = "Missing Username",
stun_433_Use_tls[] = "Use TLS",
#ifdef USE_TURN
turn_434_Missing_realm[] = "Missing Realm",
turn_435_Missing_nonce[] = "Missing Nonce",
turn_436_Unknown_username[] = "Unknown Username",
turn_437_No_binding[] = "No Binding",
turn_439_Illegal_port[] = "Illegal Port",
#endif
stun_500_Server_error[] = "Server Error",
stun_600_Global_failure[] = "Global Failure";
#define set16(b, offset, value) \
(((b)[(offset) + 0] = ((value) >> 8) & 255), \
((b)[(offset) + 1] = (value) & 255))
#define get16(b, offset) \
(((b)[(offset) + 0] << 8) | \
((b)[(offset) + 1] << 0))
int stun_parse_message(stun_msg_t *msg)
{
unsigned len;
int i;
unsigned char *p;
/* parse header first */
p = msg->enc_buf.data;
msg->stun_hdr.msg_type = get16(p, 0);
msg->stun_hdr.msg_len = get16(p, 2);
memcpy(msg->stun_hdr.tran_id, p + 4, STUN_TID_BYTES);
SU_DEBUG_5(("%s: Parse STUN message: Length = %d\n", __func__,
msg->stun_hdr.msg_len));
/* parse attributes */
len = msg->stun_hdr.msg_len;
p = msg->enc_buf.data + 20;
msg->stun_attr = NULL;
while (len > 0) {
i = stun_parse_attribute(msg, p);
if (i <= 0) {
SU_DEBUG_3(("%s: Error parsing attribute.\n", __func__));
return -1;
}
p += i;
len -= i;
}
return 0;
}
int stun_parse_attribute(stun_msg_t *msg, unsigned char *p)
{
int len;
uint16_t attr_type;
stun_attr_t *attr, *next;
attr_type = get16(p, 0);
len = get16(p, 2);
SU_DEBUG_5(("%s: received attribute: Type %02X, Length %d - %s\n",
__func__, attr_type, len, stun_attr_phrase(attr_type)));
if (attr_type > STUN_A_LAST_MANDATORY && attr_type < STUN_A_OPTIONAL) {
return -1;
}
attr = (stun_attr_t *)calloc(1, sizeof(stun_attr_t));
if (!attr)
return -1;
attr->next = NULL;
attr->attr_type = attr_type;
p += 4;
switch (attr->attr_type) {
case MAPPED_ADDRESS:
case RESPONSE_ADDRESS:
case SOURCE_ADDRESS:
case CHANGED_ADDRESS:
case REFLECTED_FROM:
#ifdef USE_TURN
case TURN_ALTERNATE_SERVER:
case TURN_DESTINATION_ADDRESS:
case TURN_SOURCE_ADDRESS:
#endif
if (stun_parse_attr_address(attr, p, len) < 0) {
free(attr);
return -1;
}
break;
case ERROR_CODE:
if (stun_parse_attr_error_code(attr, p, len) <0) { free(attr); return -1; }
break;
case UNKNOWN_ATTRIBUTES:
if(stun_parse_attr_unknown_attributes(attr, p, len) <0) { free(attr); return -1; }
break;
case CHANGE_REQUEST:
#ifdef USE_TURN
case TURN_LIFETIME:
case TURN_MAGIC_COOKIE:
case TURN_BANDWIDTH:
#endif
if (stun_parse_attr_uint32(attr, p, len) <0) { free(attr); return -1; }
break;
case USERNAME:
case PASSWORD:
case STUN_A_REALM:
case STUN_A_NONCE:
#ifdef USE_TURN
case TURN_DATA:
case TURN_NONCE:
#endif
if (stun_parse_attr_buffer(attr, p, len) <0) { free(attr); return -1; }
break;
default:
/* just copy as is */
attr->pattr = NULL;
attr->enc_buf.size = len;
attr->enc_buf.data = (unsigned char *) malloc(len);
memcpy(attr->enc_buf.data, p, len);
break;
}
/* skip to end of list */
if(msg->stun_attr==NULL) {
msg->stun_attr = attr;
}
else {
next = msg->stun_attr;
while(next->next!=NULL) {
next = next->next;
}
next->next = attr;
}
return len+4;
}
int stun_parse_attr_address(stun_attr_t *attr,
const unsigned char *p,
unsigned len)
{
su_sockaddr_t *addr;
int addrlen;
char ipaddr[SU_ADDRSIZE + 2];
if (len != 8) {
return -1;
}
addrlen = sizeof(su_sockaddr_t);
addr = (su_sockaddr_t *) malloc(addrlen);
if (*(p+1) == 1) { /* expected value for IPv4 */
addr->su_sin.sin_family = AF_INET;
}
else {
free(addr);
return -1;
}
memcpy(&addr->su_sin.sin_port, p + 2, 2);
memcpy(&addr->su_sin.sin_addr.s_addr, p + 4, 4);
SU_DEBUG_5(("%s: address attribute: %s:%d\n", __func__,
inet_ntop(addr->su_family, SU_ADDR(addr), ipaddr, sizeof(ipaddr)),
(unsigned) ntohs(addr->su_sin.sin_port)));
attr->pattr = addr;
stun_init_buffer(&attr->enc_buf);
return 0;
}
int stun_parse_attr_error_code(stun_attr_t *attr, const unsigned char *p, unsigned len) {
uint32_t tmp;
stun_attr_errorcode_t *error;
memcpy(&tmp, p, sizeof(uint32_t));
tmp = ntohl(tmp);
error = (stun_attr_errorcode_t *) malloc(sizeof(*error));
error->code = (tmp & STUN_EC_CLASS)*100 + (tmp & STUN_EC_NUM);
error->phrase = (char *) malloc(len-3);
strncpy(error->phrase, (char*)p+4, len-4);
error->phrase[len - 4] = '\0';
attr->pattr = error;
stun_init_buffer(&attr->enc_buf);
return 0;
}
int stun_parse_attr_uint32(stun_attr_t *attr, const unsigned char *p, unsigned len)
{
uint32_t tmp;
stun_attr_changerequest_t *cr;
cr = (stun_attr_changerequest_t *) malloc(sizeof(*cr));
memcpy(&tmp, p, sizeof(uint32_t));
cr->value = ntohl(tmp);
attr->pattr = cr;
stun_init_buffer(&attr->enc_buf);
return 0;
}
int stun_parse_attr_buffer(stun_attr_t *attr, const unsigned char *p, unsigned len)
{
stun_buffer_t *buf;
buf = (stun_buffer_t *) malloc(sizeof(stun_buffer_t));
buf->size = len;
buf->data = (unsigned char *) malloc(len);
memcpy(buf->data, p, len);
attr->pattr = buf;
stun_init_buffer(&attr->enc_buf);
return 0;
}
int stun_parse_attr_unknown_attributes(stun_attr_t *attr,
const unsigned char *p,
unsigned len)
{
return 0;
}
/** scan thru attribute list and return the next requested attr */
stun_attr_t *stun_get_attr(stun_attr_t *attr, uint16_t attr_type) {
stun_attr_t *p;
for (p = attr; p != NULL; p = p->next) {
if (p->attr_type == attr_type)
break;
}
return p;
}
void stun_init_buffer(stun_buffer_t *p) {
p->data = NULL;
p->size = 0;
}
int stun_free_buffer(stun_buffer_t *p) {
if (p->data)
free(p->data), p->data = NULL;
p->size = 0;
return 0;
}
int stun_copy_buffer(stun_buffer_t *p, stun_buffer_t *p2) {
stun_free_buffer(p); /* clean up existing data */
p->size = p2->size;
p->data = (unsigned char *) malloc(p->size);
memcpy(p->data, p2->data, p->size);
return p->size;
}
const char *stun_response_phrase(int status) {
if (status <100 || status >600)
return NULL;
switch (status) {
case STUN_400_BAD_REQUEST: return stun_400_Bad_request;
case STUN_401_UNAUTHORIZED: return stun_401_Unauthorized;
case STUN_420_UNKNOWN_ATTRIBUTE: return stun_420_Unknown_attribute;
case STUN_430_STALE_CREDENTIALS: return stun_430_Stale_credentials;
case STUN_431_INTEGRITY_CHECK_FAILURE: return stun_431_Integrity_check_failure;
case STUN_432_MISSING_USERNAME: return stun_432_Missing_username;
case STUN_433_USE_TLS: return stun_433_Use_tls;
#ifdef USE_TURN
case TURN_MISSING_REALM: return turn_434_Missing_realm;
case TURN_MISSING_NONCE: return turn_435_Missing_nonce;
case TURN_UNKNOWN_USERNAME: return turn_436_Unknown_username;
case TURN_NO_BINDING: return turn_437_No_binding;
case TURN_ILLEGAL_PORT: return turn_439_Illegal_port;
#endif
case STUN_500_SERVER_ERROR: return stun_500_Server_error;
case STUN_600_GLOBAL_FAILURE: return stun_600_Global_failure;
}
return "Response";
}
/** The set of functions encodes the corresponding attribute to
* network format, and save the result to the enc_buf. Return the
* size of the buffer.
*/
/* This function is used to encode any attribute of the form ADDRESS
*/
int stun_encode_address(stun_attr_t *attr) {
stun_attr_sockaddr_t *a;
uint16_t tmp;
a = (stun_attr_sockaddr_t *)attr->pattr;
if (stun_encode_type_len(attr, 8) < 0) {
return -1;
}
tmp = htons(0x01); /* FAMILY = 0x01 */
memcpy(attr->enc_buf.data+4, &tmp, sizeof(tmp));
memcpy(attr->enc_buf.data+6, &a->sin_port, 2);
memcpy(attr->enc_buf.data+8, &a->sin_addr.s_addr, 4);
return attr->enc_buf.size;
}
int stun_encode_uint32(stun_attr_t *attr) {
uint32_t tmp;
if (stun_encode_type_len(attr, 4) < 0) {
return -1;
}
tmp = htonl(((stun_attr_changerequest_t *) attr->pattr)->value);
memcpy(attr->enc_buf.data+4, &tmp, 4);
return attr->enc_buf.size;
}
int stun_encode_error_code(stun_attr_t *attr) {
short int class, num;
size_t phrase_len, padded;
stun_attr_errorcode_t *error;
error = (stun_attr_errorcode_t *) attr->pattr;
class = error->code / 100;
num = error->code % 100;
phrase_len = strlen(error->phrase);
if (phrase_len + 8 > 65536)
phrase_len = 65536 - 8;
/* note: align the phrase len (see RFC3489:11.2.9) */
padded = phrase_len + (phrase_len % 4 == 0 ? 0 : 4 - (phrase_len % 4));
/* note: error-code has four octets of headers plus the
* reason field -> len+4 octets */
if (stun_encode_type_len(attr, (uint16_t)(padded + 4)) < 0) {
return -1;
}
else {
assert(attr->enc_buf.size == padded + 8);
memset(attr->enc_buf.data+4, 0, 2);
attr->enc_buf.data[6] = class;
attr->enc_buf.data[7] = num;
/* note: 4 octets of TLV header and 4 octets of error-code header */
memcpy(attr->enc_buf.data+8, error->phrase,
phrase_len);
memset(attr->enc_buf.data + 8 + phrase_len, 0, padded - phrase_len);
}
return attr->enc_buf.size;
}
int stun_encode_buffer(stun_attr_t *attr) {
stun_buffer_t *a;
a = (stun_buffer_t *)attr->pattr;
assert(a->size < 65536);
if (stun_encode_type_len(attr, (uint16_t)a->size) < 0) {
return -1;
}
memcpy(attr->enc_buf.data+4, a->data, a->size);
return attr->enc_buf.size;
}
#if defined(HAVE_OPENSSL)
int stun_encode_message_integrity(stun_attr_t *attr,
unsigned char *buf,
int len,
stun_buffer_t *pwd) {
int padded_len;
unsigned int dig_len;
unsigned char *padded_text = NULL;
void *sha1_hmac;
if (stun_encode_type_len(attr, 20) < 0) {
return -1;
}
/* zero padding */
if (len % 64 != 0) {
padded_len = len + (64 - (len % 64));
padded_text = (unsigned char *) malloc(padded_len);
memcpy(padded_text, buf, len);
memset(padded_text + len, 0, padded_len - len);
sha1_hmac = HMAC(EVP_sha1(), pwd->data, pwd->size, padded_text, padded_len, NULL, &dig_len);
}
else {
sha1_hmac = HMAC(EVP_sha1(), pwd->data, pwd->size, buf, len, NULL, &dig_len);
}
assert(dig_len == 20);
memcpy(attr->enc_buf.data + 4, sha1_hmac, 20);
free(padded_text);
return attr->enc_buf.size;
}
#else
int stun_encode_message_integrity(stun_attr_t *attr,
unsigned char *buf,
int len,
stun_buffer_t *pwd) {
return 0;
}
#endif /* HAVE_OPENSSL */
/** this function allocates the enc_buf, fills in type, length */
int stun_encode_type_len(stun_attr_t *attr, uint16_t len) {
uint16_t tmp;
attr->enc_buf.data = (unsigned char *) malloc(len + 4);
memset(attr->enc_buf.data, 0, len + 4);
tmp = htons(attr->attr_type);
memcpy(attr->enc_buf.data, &tmp, 2);
tmp = htons(len);
memcpy(attr->enc_buf.data + 2, &tmp, 2);
attr->enc_buf.size = len + 4;
return 0;
}
/**
* Validate the message integrity based on given
* STUN password 'pwd'. The received content should be
* in msg->enc_buf.
*/
int stun_validate_message_integrity(stun_msg_t *msg, stun_buffer_t *pwd)
{
#if defined(HAVE_OPENSSL)
int padded_len, len;
unsigned int dig_len;
unsigned char dig[20]; /* received sha1 digest */
unsigned char *padded_text;
#endif
/* password NULL so shared-secret not established and
messege integrity checks can be skipped */
if (pwd->data == NULL)
return 0;
/* otherwise the check must match */
#if defined(HAVE_OPENSSL)
/* message integrity not received */
if (stun_get_attr(msg->stun_attr, MESSAGE_INTEGRITY) == NULL) {
SU_DEBUG_5(("%s: error: message integrity missing.\n", __func__));
return -1;
}
/* zero padding */
len = msg->enc_buf.size - 24;
padded_len = len + (len % 64 == 0 ? 0 : 64 - (len % 64));
padded_text = (unsigned char *) malloc(padded_len);
memset(padded_text, 0, padded_len);
memcpy(padded_text, msg->enc_buf.data, len);
memcpy(dig, HMAC(EVP_sha1(), pwd->data, pwd->size, padded_text, padded_len, NULL, &dig_len), 20);
if (memcmp(dig, msg->enc_buf.data + msg->enc_buf.size - 20, 20) != 0) {
/* does not match, but try the test server's password */
if (memcmp(msg->enc_buf.data+msg->enc_buf.size-20, "hmac-not-implemented", 20) != 0) {
SU_DEBUG_5(("%s: error: message digest problem.\n", __func__));
return -1;
}
}
else {
SU_DEBUG_5(("%s: message integrity validated.\n", __func__));
}
free(padded_text);
return 0;
#else /* HAVE_OPENSSL */
return -1;
#endif
}
void debug_print(stun_buffer_t *buf) {
unsigned i;
for(i = 0; i < buf->size/4; i++) {
SU_DEBUG_9(("%02x %02x %02x %02x\n",
*(buf->data + i*4),
*(buf->data + i*4 +1),
*(buf->data + i*4 +2),
*(buf->data + i*4 +3)));
if (i == 4)
SU_DEBUG_9(("---------------------\n"));
}
SU_DEBUG_9(("\n"));
}
int stun_init_message(stun_msg_t *msg) {
msg->stun_hdr.msg_type = 0;
msg->stun_hdr.msg_len = 0;
msg->stun_attr = NULL;
stun_init_buffer(&msg->enc_buf);
return 0;
}
int stun_free_message(stun_msg_t *msg) {
stun_attr_t *p, *p2;
/* clearing header */
memset(&msg->stun_hdr, 0, sizeof msg->stun_hdr);
/* clearing attr */
p = msg->stun_attr;
while(p) {
if(p->pattr) {
switch(p->attr_type) {
case USERNAME:
case PASSWORD:
#ifdef USE_TURN
case TURN_DATA:
case TURN_NONCE:
#endif
stun_free_buffer(p->pattr);
break;
default:
free(p->pattr);
}
}
stun_free_buffer(&p->enc_buf);
p2 = p->next;
free(p);
p = p2;
}
msg->stun_attr = NULL;
/* clearing buffer */
stun_free_buffer(&msg->enc_buf);
return 0;
}
int stun_send_message(su_socket_t s, su_sockaddr_t *to_addr,
stun_msg_t *msg, stun_buffer_t *pwd)
{
int err;
char ipaddr[SU_ADDRSIZE + 2];
stun_attr_t **a, *b;
stun_encode_message(msg, pwd);
err = su_sendto(s, msg->enc_buf.data, msg->enc_buf.size, 0,
to_addr, SU_SOCKADDR_SIZE(to_addr));
free(msg->enc_buf.data), msg->enc_buf.data = NULL;
msg->enc_buf.size = 0;
for (a = &msg->stun_attr; *a;) {
if ((*a)->pattr)
free((*a)->pattr), (*a)->pattr = NULL;
if ((*a)->enc_buf.data)
free((*a)->enc_buf.data), (*a)->enc_buf.data = NULL;
b = *a;
b = b->next;
free(*a);
*a = NULL;
*a = b;
}
if (err > 0) {
inet_ntop(to_addr->su_family, SU_ADDR(to_addr), ipaddr, sizeof(ipaddr));
SU_DEBUG_5(("%s: message sent to %s:%u\n", __func__,
ipaddr, ntohs(to_addr->su_port)));
debug_print(&msg->enc_buf);
}
else
STUN_ERROR(errno, sendto);
return err;
}
/** Send a STUN message.
* This will convert the stun_msg_t to the binary format based on the
* spec
*/
int stun_encode_message(stun_msg_t *msg, stun_buffer_t *pwd) {
int z = -1, len, buf_len = 0;
unsigned char *buf;
stun_attr_t *attr, *msg_int=NULL;
if (msg->enc_buf.data == NULL) {
/* convert msg to binary format */
/* convert attributes to binary format for transmission */
len = 0;
for (attr = msg->stun_attr; attr ; attr = attr->next) {
switch(attr->attr_type) {
case RESPONSE_ADDRESS:
case MAPPED_ADDRESS:
case SOURCE_ADDRESS:
case CHANGED_ADDRESS:
case REFLECTED_FROM:
#ifdef USE_TURN
case TURN_ALTERNATE_SERVER:
case TURN_DESTINATION_ADDRESS:
case TURN_SOURCE_ADDRESS:
#endif
z = stun_encode_address(attr);
break;
case CHANGE_REQUEST:
#ifdef USE_TURN
case TURN_LIFETIME:
case TURN_MAGIC_COOKIE:
case TURN_BANDWIDTH:
#endif
z = stun_encode_uint32(attr);
break;
case USERNAME:
case PASSWORD:
#ifdef USE_TURN
case TURN_REALM:
case TURN_NONCE:
case TURN_DATA:
#endif
z = stun_encode_buffer(attr);
break;
case MESSAGE_INTEGRITY:
msg_int = attr;
z = 24;
break;
case ERROR_CODE:
z = stun_encode_error_code(attr);
default:
break;
}
if(z < 0) return z;
len += z;
}
msg->stun_hdr.msg_len = len;
buf_len = 20 + msg->stun_hdr.msg_len;
buf = (unsigned char *) malloc(buf_len);
/* convert to binary format for transmission */
set16(buf, 0, msg->stun_hdr.msg_type);
set16(buf, 2, msg->stun_hdr.msg_len);
memcpy(buf + 4, msg->stun_hdr.tran_id, STUN_TID_BYTES);
len = 20;
/* attaching encoded attributes */
attr = msg->stun_attr;
while(attr) {
/* attach only if enc_buf is not null */
if(attr->enc_buf.data && attr->attr_type != MESSAGE_INTEGRITY) {
memcpy(buf+len, (void *)attr->enc_buf.data, attr->enc_buf.size);
len += attr->enc_buf.size;
}
attr = attr->next;
}
if (msg_int) {
/* compute message integrity */
if(stun_encode_message_integrity(msg_int, buf, len, pwd)!=24) {
free(buf);
return -1;
}
memcpy(buf+len, (void *)msg_int->enc_buf.data,
msg_int->enc_buf.size);
}
/* save binary buffer for future reference */
if (msg->enc_buf.data)
free(msg->enc_buf.data);
msg->enc_buf.data = buf; msg->enc_buf.size = buf_len;
}
return 0;
}
#include <sofia-sip/su.h>
#include <sofia-sip/su_debug.h>
#include <sofia-sip/su_localinfo.h>
char *stun_determine_ip_address(int family)
{
char *local_ip_address;
su_localinfo_t *li = NULL, hints[1] = {{ LI_CANONNAME|LI_NUMERIC }};
int error;
size_t address_size;
struct sockaddr_in *sa = NULL;
su_sockaddr_t *temp;
hints->li_family = family;
hints->li_canonname = getenv("HOSTADDRESS");
if ((error = su_getlocalinfo(hints, &li)) < 0) {
SU_DEBUG_5(("%s: stun_determine_ip_address, su_getlocalinfo: %s\n",
__func__, su_gli_strerror(error)));
return NULL;
}
temp = li->li_addr;
sa = &temp->su_sin;
address_size = strlen(inet_ntoa(sa->sin_addr));
local_ip_address = malloc(address_size + 1);
strcpy(local_ip_address, (char *) inet_ntoa(sa->sin_addr)); /* otherwise? */
su_freelocalinfo(li);
return local_ip_address;
}
const char *stun_attr_phrase(uint16_t type)
{
switch(type) {
case MAPPED_ADDRESS: return "MAPPED-ADDRESS";
case RESPONSE_ADDRESS: return "RESPONSE-ADDRESS";
case CHANGE_REQUEST: return "CHANGE-REQUEST";
case SOURCE_ADDRESS: return "SOURCE-ADDRESS";
case CHANGED_ADDRESS: return "CHANGED-ADDRESS";
case USERNAME: return "USERNAME";
case PASSWORD: return "PASSWORD";
case MESSAGE_INTEGRITY: return "MESSAGE-INTEGRITY";
case ERROR_CODE: return "ERROR-CODE";
case UNKNOWN_ATTRIBUTES: return "UNKNOWN-ATTRIBUTES";
case REFLECTED_FROM: return "REFLECTED-FROM";
case STUN_A_ALTERNATE_SERVER:
case STUN_A_ALTERNATE_SERVER_DEP:
return "ALTERNATE-SERVER";
case STUN_A_REALM: return "REALM";
case STUN_A_NONCE: return "NONCE";
case STUN_A_XOR_MAPPED_ADDRESS: return "XOR-MAPPED-ADDRESS";
#ifdef USE_TURN
case TURN_REALM: return "REALM";
case TURN_LIFETIME: return "LIFETIME";
case TURN_ALTERNATE_SERVER: return "ALTERNATE_SERVER";
case TURN_MAGIC_COOKIE: return "MAGIC_COOKIE";
case TURN_BANDWIDTH: return "BANDWIDTH";
case TURN_DESTINATION_ADDRESS: return "DESTINATION_ADDRESS";
case TURN_SOURCE_ADDRESS: return "SOURCE_ADDRESS";
case TURN_DATA: return "DATA";
case TURN_NONCE: return "NONCE";
#endif
default: return "Attribute undefined";
}
}
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