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switch_stun.c
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switch_stun.c
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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
*
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
*
* The Initial Developer of the Original Code is
* Anthony Minessale II <anthm@freeswitch.org>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Anthony Minessale II <anthm@freeswitch.org>
* Fanzhou Zhao <fanzhou@gmail.com> 2006-08-22 (Bugfix 2357-2358)
*
*
* switch_stun.c STUN (Simple Traversal of UDP over NAT)
*
*/
#include <switch.h>
#include <switch_stun.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
struct value_mapping {
const uint32_t value;
const char *name;
};
static const struct value_mapping PACKET_TYPES[] = {
{SWITCH_STUN_BINDING_REQUEST, "BINDING_REQUEST"},
{SWITCH_STUN_BINDING_RESPONSE, "BINDING_RESPONSE"},
{SWITCH_STUN_BINDING_ERROR_RESPONSE, "BINDING_ERROR_RESPONSE"},
{SWITCH_STUN_SHARED_SECRET_REQUEST, "SHARED_SECRET_REQUEST"},
{SWITCH_STUN_SHARED_SECRET_RESPONSE, "SHARED_SECRET_RESPONSE"},
{SWITCH_STUN_SHARED_SECRET_ERROR_RESPONSE, "SHARED_SECRET_ERROR_RESPONSE"},
{SWITCH_STUN_ALLOCATE_REQUEST, "ALLOCATE_REQUEST"},
{SWITCH_STUN_ALLOCATE_RESPONSE, "ALLOCATE_RESPONSE"},
{SWITCH_STUN_ALLOCATE_ERROR_RESPONSE, "ALLOCATE_ERROR_RESPONSE"},
{SWITCH_STUN_SEND_REQUEST, "SEND_REQUEST"},
{SWITCH_STUN_SEND_RESPONSE, "SEND_RESPONSE"},
{SWITCH_STUN_SEND_ERROR_RESPONSE, "SEND_ERROR_RESPONSE"},
{SWITCH_STUN_DATA_INDICATION, "DATA_INDICATION"},
{0, 0}
};
static const struct value_mapping ATTR_TYPES[] = {
{SWITCH_STUN_ATTR_MAPPED_ADDRESS, "MAPPED_ADDRESS"},
{SWITCH_STUN_ATTR_XOR_MAPPED_ADDRESS, "XOR_MAPPED_ADDRESS"},
{SWITCH_STUN_ATTR_RESPONSE_ADDRESS, "RESPONSE_ADDRESS"},
{SWITCH_STUN_ATTR_CHANGE_REQUEST, "CHANGE_REQUEST"},
{SWITCH_STUN_ATTR_SOURCE_ADDRESS, "SOURCE_ADDRESS"},
{SWITCH_STUN_ATTR_CHANGED_ADDRESS, "CHANGED_ADDRESS"},
{SWITCH_STUN_ATTR_USERNAME, "USERNAME"},
{SWITCH_STUN_ATTR_PASSWORD, "PASSWORD"},
{SWITCH_STUN_ATTR_MESSAGE_INTEGRITY, "MESSAGE_INTEGRITY"},
{SWITCH_STUN_ATTR_ERROR_CODE, "ERROR_CODE"},
{SWITCH_STUN_ATTR_UNKNOWN_ATTRIBUTES, "UNKNOWN_ATTRIBUTES"},
{SWITCH_STUN_ATTR_REFLECTED_FROM, "REFLECTED_FROM"},
{SWITCH_STUN_ATTR_TRANSPORT_PREFERENCES, "TRANSPORT_PREFERENCES"},
{SWITCH_STUN_ATTR_LIFETIME, "LIFETIME"},
{SWITCH_STUN_ATTR_ALTERNATE_SERVER, "ALTERNATE_SERVER"},
{SWITCH_STUN_ATTR_MAGIC_COOKIE, "MAGIC_COOKIE"},
{SWITCH_STUN_ATTR_BANDWIDTH, "BANDWIDTH"},
{SWITCH_STUN_ATTR_DESTINATION_ADDRESS, "DESTINATION_ADDRESS"},
{SWITCH_STUN_ATTR_SOURCE_ADDRESS2, "SOURCE_ADDRESS2"},
{SWITCH_STUN_ATTR_DATA, "DATA"},
{SWITCH_STUN_ATTR_OPTIONS, "OPTIONS"},
{SWITCH_STUN_ATTR_PRIORITY, "PRIORITY"},
{SWITCH_STUN_ATTR_USE_CAND, "USE_CAND"},
{SWITCH_STUN_ATTR_PADDING, "PADDING"},
{SWITCH_STUN_ATTR_RESP_PORT, "RESP_PORT"},
{SWITCH_STUN_ATTR_SOFTWARE, "SOFTWARE"},
{SWITCH_STUN_ATTR_ALT_SERVER, "ALT_SERVER"},
{SWITCH_STUN_ATTR_FINGERPRINT, "FINGERPRINT"},
{SWITCH_STUN_ATTR_CONTROLLED, "CONTROLLED"},
{SWITCH_STUN_ATTR_CONTROLLING, "CONTROLLING"},
{SWITCH_STUN_ATTR_RESP_ORIGIN, "RESP_ORIGIN"},
{SWITCH_STUN_ATTR_OTHER_ADDR, "OTHER_ADDR"},
{0, 0}
};
static const struct value_mapping ERROR_TYPES[] = {
{SWITCH_STUN_ERROR_BAD_REQUEST, "BAD_REQUEST"},
{SWITCH_STUN_ERROR_UNAUTHORIZED, "UNAUTHORIZED"},
{SWITCH_STUN_ERROR_UNKNOWN_ATTRIBUTE, "UNKNOWN_ATTRIBUTE"},
{SWITCH_STUN_ERROR_STALE_CREDENTIALS, "STALE_CREDENTIALS"},
{SWITCH_STUN_ERROR_INTEGRITY_CHECK_FAILURE, "INTEGRITY_CHECK_FAILURE"},
{SWITCH_STUN_ERROR_MISSING_USERNAME, "MISSING_USERNAME"},
{SWITCH_STUN_ERROR_USE_TLS, "USE_TLS"},
{SWITCH_STUN_ERROR_SERVER_ERROR, "SERVER_ERROR"},
{SWITCH_STUN_ERROR_GLOBAL_FAILURE, "GLOBAL_FAILURE"},
{0, 0}
};
static void v6_xor(uint8_t *addr, const uint8_t *transaction_id)
{
int i;
addr[0] ^= 0x21;
addr[1] ^= 0x12;
addr[2] ^= 0xa4;
addr[3] ^= 0x42;
for (i = 0; i < 12; i++) {
addr[i + 4] ^= transaction_id[i];
}
}
SWITCH_DECLARE(void) switch_stun_random_string(char *buf, uint16_t len, char *set)
{
char chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
int max;
uint16_t x;
if (!set) {
set = chars;
}
max = (int) strlen(set);
for (x = 0; x < len; x++) {
int j = (int) (max * 1.0 * switch_rand() / (SWITCH_RAND_MAX + 1.0));
buf[x] = set[j];
}
}
SWITCH_DECLARE(switch_stun_packet_t *) switch_stun_packet_parse(uint8_t *buf, uint32_t len)
{
switch_stun_packet_t *packet;
switch_stun_packet_attribute_t *attr;
uint32_t bytes_left = len;
void *end_buf = buf + len;
int xlen = 0;
if (len < SWITCH_STUN_PACKET_MIN_LEN) {
return NULL;
}
packet = (switch_stun_packet_t *) buf;
packet->header.type = ntohs(packet->header.type);
packet->header.length = ntohs(packet->header.length);
if (packet->header.length > (bytes_left -= 20)) return NULL;
/*
* Check packet type (RFC3489(bis?) values)
*/
switch (packet->header.type) {
case SWITCH_STUN_BINDING_REQUEST:
case SWITCH_STUN_BINDING_RESPONSE:
case SWITCH_STUN_BINDING_ERROR_RESPONSE:
case SWITCH_STUN_SHARED_SECRET_REQUEST:
case SWITCH_STUN_SHARED_SECRET_RESPONSE:
case SWITCH_STUN_SHARED_SECRET_ERROR_RESPONSE:
case SWITCH_STUN_ALLOCATE_REQUEST:
case SWITCH_STUN_ALLOCATE_RESPONSE:
case SWITCH_STUN_ALLOCATE_ERROR_RESPONSE:
case SWITCH_STUN_SEND_REQUEST:
case SWITCH_STUN_SEND_RESPONSE:
case SWITCH_STUN_SEND_ERROR_RESPONSE:
case SWITCH_STUN_DATA_INDICATION:
/* Valid */
break;
default:
/* Invalid value */
return NULL;
}
/*
* Check for length overflow
*/
if (bytes_left <= 0) {
/* Invalid */
return NULL;
}
/*
* No payload?
*/
if (packet->header.length == 0) {
/* Invalid?! */
return NULL;
}
/* check if we have enough bytes left for an attribute */
if (bytes_left < SWITCH_STUN_ATTRIBUTE_MIN_LEN) {
return NULL;
}
switch_stun_packet_first_attribute(packet, attr);
do {
int16_t alen;
if (bytes_left < 4) return NULL;
attr->length = ntohs(attr->length);
attr->type = ntohs(attr->type);
bytes_left -= 4; /* attribute header consumed */
alen = switch_stun_attribute_padded_length(attr);
if (alen > (int)bytes_left || alen < 0) {
/*
* Note we simply don't "break" here out of the loop anymore because
* we don't want the upper layers to have to deal with attributes without a value
* (or worse: invalid length)
*/
return NULL;
}
/*
* Handle STUN attributes
*/
switch (attr->type) {
case SWITCH_STUN_ATTR_MAPPED_ADDRESS: /* Address, we only care about this one, but parse the others too */
case SWITCH_STUN_ATTR_XOR_MAPPED_ADDRESS:
case SWITCH_STUN_ATTR_RESPONSE_ADDRESS:
case SWITCH_STUN_ATTR_SOURCE_ADDRESS:
case SWITCH_STUN_ATTR_CHANGED_ADDRESS:
case SWITCH_STUN_ATTR_REFLECTED_FROM:
case SWITCH_STUN_ATTR_ALTERNATE_SERVER:
case SWITCH_STUN_ATTR_DESTINATION_ADDRESS:
case SWITCH_STUN_ATTR_PRIORITY:
{
switch_stun_ip_t *ip = (switch_stun_ip_t *) attr->value;
ip->port = ntohs(ip->port);
}
break;
case SWITCH_STUN_ATTR_SOURCE_ADDRESS2:
{
switch_stun_ip_t *ip;
uint32_t addr_length = 0;
ip = (switch_stun_ip_t *) attr->value;
switch (ip->family) {
case 0x01: /* IPv4 */
addr_length = 4;
break;
case 0x02: /* IPv6 */
addr_length = 16;
break;
default: /* Invalid */
return NULL;
}
/* attribute payload length must be == address length + size of other payload fields (family...) */
if (attr->length != addr_length + 4) {
/* Invalid */
return NULL;
}
ip->port = ntohs(ip->port);
}
break;
case SWITCH_STUN_ATTR_CHANGE_REQUEST: /* UInt32 */
case SWITCH_STUN_ATTR_LIFETIME:
case SWITCH_STUN_ATTR_BANDWIDTH:
case SWITCH_STUN_ATTR_OPTIONS:
{
uint32_t *val = (uint32_t *) attr->value;
if (attr->length != sizeof(uint32_t)) {
/* Invalid */
return NULL;
}
*val = ntohl(*val); /* should we do this here? */
}
break;
case SWITCH_STUN_ATTR_ERROR_CODE: /* ErrorCode */
{
uint32_t *u = (uint32_t *) attr->value;
*u = htonl(*u);
}
break;
case SWITCH_STUN_ATTR_SOFTWARE:
case SWITCH_STUN_ATTR_USERNAME: /* ByteString, multiple of 4 bytes */
case SWITCH_STUN_ATTR_PASSWORD: /* ByteString, multiple of 4 bytes */
case SWITCH_STUN_ATTR_DATA: /* ByteString */
case SWITCH_STUN_ATTR_TRANSPORT_PREFERENCES: /* TransportPrefs */
/*
* No length checking here, since we already checked against the padded length
* before
*/
break;
case SWITCH_STUN_ATTR_MESSAGE_INTEGRITY: /* ByteString, 20 bytes */
if (attr->length != 20) {
/* Invalid */
return NULL;
}
break;
case SWITCH_STUN_ATTR_MAGIC_COOKIE: /* ByteString, 4 bytes */
if (attr->length != 4) {
/* Invalid */
return NULL;
}
break;
case SWITCH_STUN_ATTR_UNKNOWN_ATTRIBUTES: /* UInt16List (= multiple of 2 bytes) */
if (attr->length % 2 != 0) {
return NULL;
}
break;
default:
break;
}
bytes_left -= alen; /* attribute value consumed, substract padded length */
xlen += 4 + alen;
attr = (switch_stun_packet_attribute_t *) (attr->value + alen);
if ((void *)attr > end_buf) {
break;
}
} while (xlen < packet->header.length);
if ((uint32_t) (packet->header.length + 20) > (uint32_t) (len - bytes_left)) {
/*
* the packet length is longer than the length of all attributes?
* for now simply decrease the packet size
*/
packet->header.length = (uint16_t) ((len - bytes_left) - 20);
}
return packet;
}
SWITCH_DECLARE(const char *) switch_stun_value_to_name(int32_t type, uint32_t value)
{
uint32_t x = 0;
const struct value_mapping *map = NULL;
switch (type) {
case SWITCH_STUN_TYPE_PACKET_TYPE:
map = PACKET_TYPES;
break;
case SWITCH_STUN_TYPE_ATTRIBUTE:
map = ATTR_TYPES;
break;
case SWITCH_STUN_TYPE_ERROR:
map = ERROR_TYPES;
break;
default:
map = NULL;
break;
}
if (map) {
for (x = 0; map[x].value; x++) {
if (map[x].value == value) {
return map[x].name;
}
}
}
return "INVALID";
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_get_mapped_address(switch_stun_packet_attribute_t *attribute, char *ipstr, switch_size_t iplen, uint16_t *port)
{
switch_stun_ip_t *ip;
uint8_t x, *i;
char *p = ipstr;
ip = (switch_stun_ip_t *) attribute->value;
i = (uint8_t *) & ip->address;
*ipstr = 0;
for (x = 0; x < 4; x++) {
sprintf(p, "%u%s", i[x], x == 3 ? "" : ".");
p = ipstr + strlen(ipstr);
}
*port = ip->port;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_get_xor_mapped_address(switch_stun_packet_attribute_t *attribute, switch_stun_packet_header_t *header, char *ipstr, switch_size_t iplen, uint16_t *port)
{
switch_stun_ip_t *ip;
switch_stun_ipv6_t *ipv6;
uint8_t x, *i;
char *p = ipstr;
ip = (switch_stun_ip_t *) attribute->value;
if (ip->family == 2) {
uint8_t *v6addr;
ipv6 = (switch_stun_ipv6_t *)attribute->value;
v6addr = (uint8_t *) &ipv6->address;
v6_xor(v6addr, (uint8_t *)header->id);
inet_ntop(AF_INET6, v6addr, ipstr, iplen);
} else {
ip->address ^= header->cookie;
i = (uint8_t *) & ip->address;
*ipstr = 0;
for (x = 0; x < 4; x++) {
sprintf(p, "%u%s", i[x], x == 3 ? "" : ".");
p = ipstr + strlen(ipstr);
}
}
ip->port ^= ntohl(header->cookie) >> 16;
*port = ip->port;
return 1;
}
SWITCH_DECLARE(char *) switch_stun_packet_attribute_get_username(switch_stun_packet_attribute_t *attribute, char *username, uint16_t len)
{
uint16_t cpylen;
cpylen = attribute->length < len ? attribute->length : len;
return memcpy(username, attribute->value, cpylen);
}
SWITCH_DECLARE(switch_stun_packet_t *) switch_stun_packet_build_header(switch_stun_message_t type, char *id, uint8_t *buf)
{
switch_stun_packet_header_t *header;
header = (switch_stun_packet_header_t *) buf;
header->type = htons(type);
header->length = 0;
header->cookie = htonl(STUN_MAGIC_COOKIE);
if (id) {
memcpy(header->id, id, 12);
} else {
switch_stun_random_string(header->id, 12, NULL);
}
return (switch_stun_packet_t *) buf;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_binded_address(switch_stun_packet_t *packet, char *ipstr, uint16_t port, int family)
{
switch_stun_packet_attribute_t *attribute;
switch_stun_ip_t *ip;
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_XOR_MAPPED_ADDRESS);
if (family == AF_INET6) {
attribute->length = htons(20);
} else {
attribute->length = htons(8);
}
ip = (switch_stun_ip_t *) attribute->value;
ip->port = htons(port ^ (STUN_MAGIC_COOKIE >> 16));
if (family == AF_INET6) {
ip->family = 2;
} else {
ip->family = 1;
}
if (family == AF_INET6) {
inet_pton(AF_INET6, ipstr, (struct in6_addr *) &ip->address);
} else {
inet_pton(AF_INET, ipstr, (int *) &ip->address);
}
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_xor_binded_address(switch_stun_packet_t *packet, char *ipstr, uint16_t port, int family)
{
switch_stun_packet_attribute_t *attribute;
switch_stun_ip_t *ip;
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_XOR_MAPPED_ADDRESS);
if (family == AF_INET6) {
attribute->length = htons(20);
} else {
attribute->length = htons(8);
}
ip = (switch_stun_ip_t *) attribute->value;
ip->port = htons(port ^ (STUN_MAGIC_COOKIE >> 16));
if (family == AF_INET6) {
ip->family = 2;
} else {
ip->family = 1;
}
if (family == AF_INET6) {
inet_pton(AF_INET6, ipstr, (struct in6_addr *) &ip->address);
v6_xor((uint8_t *)&ip->address, (uint8_t *)packet->header.id);
} else {
inet_pton(AF_INET, ipstr, (int *) &ip->address);
ip->address = htonl(ntohl(ip->address) ^ STUN_MAGIC_COOKIE);
}
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_priority(switch_stun_packet_t *packet, uint32_t priority)
{
switch_stun_packet_attribute_t *attribute;
priority = htonl(priority);
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_PRIORITY);
attribute->length = htons(4);
memcpy(attribute->value, &priority, 4);
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_integrity(switch_stun_packet_t *packet, const char *pass)
{
switch_stun_packet_attribute_t *attribute;
uint16_t xlen;
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_MESSAGE_INTEGRITY);
attribute->length = htons(20);
xlen = ntohs(packet->header.length) + sizeof(switch_stun_packet_header_t);
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
HMAC(EVP_sha1(), (unsigned char *)pass, (int)strlen(pass), (void *)packet, xlen, (void *)attribute->value, NULL);
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_fingerprint(switch_stun_packet_t *packet)
{
switch_stun_packet_attribute_t *attribute;
uint32_t crc;
uint16_t xlen;
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_FINGERPRINT);
attribute->length = htons(4);
xlen = ntohs(packet->header.length) + sizeof(switch_stun_packet_header_t);
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
crc = htonl(switch_crc32_8bytes(packet, xlen) ^ 0x5354554e);
memcpy(attribute->value, &crc, 4);
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_use_candidate(switch_stun_packet_t *packet)
{
switch_stun_packet_attribute_t *attribute;
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_USE_CAND);
attribute->length = htons(0);
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_controlling(switch_stun_packet_t *packet)
{
switch_stun_packet_attribute_t *attribute;
char buf[8];
switch_stun_random_string(buf, 8, NULL);
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_CONTROLLING);
attribute->length = htons(8);
memcpy(attribute->value, buf, 8);
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_controlled(switch_stun_packet_t *packet)
{
switch_stun_packet_attribute_t *attribute;
char buf[8];
switch_stun_random_string(buf, 8, NULL);
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_CONTROLLED);
attribute->length = htons(8);
memcpy(attribute->value, buf, 8);
packet->header.length += htons(sizeof(switch_stun_packet_attribute_t)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_username(switch_stun_packet_t *packet, char *username, uint16_t ulen)
{
switch_stun_packet_attribute_t *attribute;
int m = ulen % 4;
int padding = 0;
if (m) {
padding = 4 - m;
}
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_USERNAME);
attribute->length = htons(ulen);
if (username) {
memcpy(attribute->value, username, ulen);
} else {
switch_stun_random_string(attribute->value, ulen, NULL);
}
packet->header.length += htons((u_short)(sizeof(switch_stun_packet_attribute_t) + padding)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_software(switch_stun_packet_t *packet, char *software, uint16_t ulen)
{
switch_stun_packet_attribute_t *attribute;
int m = ulen % 4;
int padding = 0;
if (m) {
padding = 4 - m;
}
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_SOFTWARE);
attribute->length = htons(ulen);
if (software) {
memcpy(attribute->value, software, ulen);
} else {
switch_stun_random_string(attribute->value, ulen, NULL);
}
packet->header.length += htons((u_short)(sizeof(switch_stun_packet_attribute_t) + padding)) + attribute->length;
return 1;
}
SWITCH_DECLARE(uint8_t) switch_stun_packet_attribute_add_password(switch_stun_packet_t *packet, char *password, uint16_t ulen)
{
switch_stun_packet_attribute_t *attribute;
int m = ulen % 4;
int padding = 0;
if (m) {
padding = 4 - m;
}
attribute = (switch_stun_packet_attribute_t *) ((uint8_t *) & packet->first_attribute + ntohs(packet->header.length));
attribute->type = htons(SWITCH_STUN_ATTR_PASSWORD);
attribute->length = htons(ulen);
if (password) {
memcpy(attribute->value, password, ulen);
} else {
switch_stun_random_string(attribute->value, ulen, NULL);
}
packet->header.length += htons((u_short)(sizeof(switch_stun_packet_attribute_t) + padding)) + attribute->length;
return 1;
}
SWITCH_DECLARE(char *) switch_stun_host_lookup(const char *host, switch_memory_pool_t *pool)
{
switch_sockaddr_t *addr = NULL;
char buf[30];
switch_status_t res;
res = switch_sockaddr_info_get(&addr, host, SWITCH_UNSPEC, 0, 0, pool);
(void)res;
return switch_core_strdup(pool, switch_str_nil(switch_get_addr(buf, sizeof(buf), addr)));
}
SWITCH_DECLARE(switch_status_t) switch_stun_lookup(char **ip,
switch_port_t *port, char *stunip, switch_port_t stunport, char **err, switch_memory_pool_t *pool)
{
switch_sockaddr_t *local_addr = NULL, *remote_addr = NULL, *from_addr = NULL;
switch_socket_t *sock = NULL;
uint8_t buf[260] = { 0 };
uint8_t *start = buf;
void *end_buf;
switch_stun_packet_t *packet;
switch_stun_packet_attribute_t *attr;
switch_size_t bytes = 0;
char username[33] = { 0 };
char rip[50] = { 0 };
uint16_t rport = 0;
switch_time_t started = 0;
int funny = 0;
int size = sizeof(buf);
int xlen = sizeof(switch_stun_packet_header_t);
switch_status_t res;
switch_assert(err);
if (*err && !strcmp(*err, "funny")) {
funny = 1;
}
*err = "Success";
res = switch_sockaddr_info_get(&from_addr, NULL, SWITCH_UNSPEC, 0, 0, pool);
(void)res;
if (switch_sockaddr_info_get(&local_addr, *ip, SWITCH_UNSPEC, *port, 0, pool) != SWITCH_STATUS_SUCCESS) {
*err = "Local Address Error!";
return SWITCH_STATUS_FALSE;
}
if (switch_sockaddr_info_get(&remote_addr, stunip, SWITCH_UNSPEC, stunport, 0, pool) != SWITCH_STATUS_SUCCESS) {
*err = "Remote Address Error!";
return SWITCH_STATUS_FALSE;
}
if (switch_socket_create(&sock, AF_INET, SOCK_DGRAM, 0, pool) != SWITCH_STATUS_SUCCESS) {
*err = "Socket Error!";
return SWITCH_STATUS_FALSE;
}
if (switch_socket_bind(sock, local_addr) != SWITCH_STATUS_SUCCESS) {
*err = "Bind Error!";
return SWITCH_STATUS_FALSE;
}
if (funny) {
*start++ = 0;
*start++ = 0;
*start++ = 0x22;
*start++ = 0x22;
}
switch_socket_opt_set(sock, SWITCH_SO_NONBLOCK, TRUE);
packet = switch_stun_packet_build_header(SWITCH_STUN_BINDING_REQUEST, NULL, start);
switch_stun_random_string(username, 32, NULL);
switch_stun_packet_attribute_add_username(packet, username, 32);
bytes = switch_stun_packet_length(packet);
if (funny) {
packet = (switch_stun_packet_t *) buf;
bytes += 4;
buf[bytes++] = 0;
buf[bytes++] = 0;
buf[bytes++] = 0;
buf[bytes++] = 0;
}
switch_socket_sendto(sock, remote_addr, 0, (void *) packet, &bytes);
started = switch_micro_time_now();
*ip = NULL;
*port = 0;
for (;;) {
bytes = sizeof(buf);
if (switch_socket_recvfrom(from_addr, sock, 0, (char *) &buf, &bytes) == SWITCH_STATUS_SUCCESS && bytes > 0) {
break;
}
if (((unsigned int)((switch_micro_time_now() - started) / 1000)) > 5000) {
*err = "Timeout";
switch_socket_shutdown(sock, SWITCH_SHUTDOWN_READWRITE);
switch_socket_close(sock);
return SWITCH_STATUS_TIMEOUT;
}
switch_cond_next();
}
switch_socket_close(sock);
if (funny) {
size -= 4;
}
packet = switch_stun_packet_parse(start, size);
if (!packet) {
*err = "Invalid STUN/ICE packet";
return SWITCH_STATUS_FALSE;
}
end_buf = buf + ((sizeof(buf) > packet->header.length) ? packet->header.length : sizeof(buf));
switch_stun_packet_first_attribute(packet, attr);
switch_assert(attr);
do {
switch (attr->type) {
case SWITCH_STUN_ATTR_MAPPED_ADDRESS:
if (funny) {
switch_stun_ip_t *tmp = (switch_stun_ip_t *) attr->value;
tmp->address ^= ntohl(0xabcdabcd);
}
switch_stun_packet_attribute_get_mapped_address(attr, rip, sizeof(rip), &rport);
break;
case SWITCH_STUN_ATTR_XOR_MAPPED_ADDRESS:
switch_stun_packet_attribute_get_xor_mapped_address(attr, &packet->header, rip, sizeof(rip), &rport);
break;
case SWITCH_STUN_ATTR_USERNAME:
switch_stun_packet_attribute_get_username(attr, username, 32);
break;
}
if (!switch_stun_packet_next_attribute(attr, end_buf)) {
break;
}
xlen += 4 + switch_stun_attribute_padded_length(attr);
} while (xlen <= packet->header.length);
if (packet->header.type == SWITCH_STUN_BINDING_RESPONSE) {
*ip = switch_core_strdup(pool, rip);
*port = rport;
return SWITCH_STATUS_SUCCESS;
} else {
*err = "Invalid Reply";
}
return SWITCH_STATUS_FALSE;
}
SWITCH_DECLARE(switch_status_t) switch_stun_ip_lookup(char **external_ip, const char *sourceip, switch_memory_pool_t *external_pool)
{
switch_status_t status = SWITCH_STATUS_FALSE;
char *stun_ip = NULL;
switch_port_t stun_port = (switch_port_t)SWITCH_STUN_DEFAULT_PORT;
char *p;
char ip_buf[256] = "";
char *ip = NULL;
switch_port_t port = 0;
switch_memory_pool_t *local_pool = NULL;
char *error = "";
if (!sourceip || !external_pool) {
*external_ip = NULL;
goto end;
}
ip = ip_buf;
if (!strncasecmp(sourceip, "host:", 5)) {
status = (*external_ip = switch_stun_host_lookup(sourceip + 5, external_pool)) ? SWITCH_STATUS_SUCCESS : SWITCH_STATUS_FALSE;
}
else if (!strncasecmp(sourceip, "stun:", 5)) {
switch_core_new_memory_pool(&local_pool);
stun_ip = switch_core_strdup(local_pool, sourceip + 5);
switch_assert(stun_ip);
if ((p = strchr(stun_ip, ':'))) {
int iport;
*p++ = '\0';
iport = atoi(p);
if (iport > 0 && iport < 0xFFFF) {
stun_port = (switch_port_t)iport;
}
}
switch_find_local_ip(ip_buf, sizeof(ip_buf), NULL, AF_INET);
if (zstr(stun_ip)) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "STUN Failed! NO STUN SERVER\n");
}
else {
if ((switch_stun_lookup(&ip, &port, stun_ip, stun_port, &error, local_pool)) == SWITCH_STATUS_SUCCESS && ip && port) {
*external_ip = switch_core_strdup(external_pool, ip);
status = SWITCH_STATUS_SUCCESS;
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "External ip address detected using STUN: %s\n", ip);
}
else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "STUN Failed! [%s]\n", error);
}
}
if (status != SWITCH_STATUS_SUCCESS) {
*external_ip = "";
}
switch_core_destroy_memory_pool(&local_pool);
}
else {
*external_ip = switch_core_strdup(external_pool, sourceip);
status = SWITCH_STATUS_SUCCESS;
}
end:
return status;
}
/// look-up table, already defined in line 18
const uint32_t crc32Lookup[8][256] =
{
//// same algorithm as crc32_bitwise
//for (uint32_t i = 0; i <= 0xFF; i++)
//{
// uint32_t crc = i;
// for (unsigned int j = 0; j < 8; j++)
// crc = (crc >> 1) ^ ((crc & 1) * Polynomial);
// crc32Lookup[0][i] = crc;
//}
//// ... and the following slicing-by-8 algorithm (from Intel):
//// http://www.intel.com/technology/comms/perfnet/download/CRC_generators.pdf
//// http://sourceforge.net/projects/slicing-by-8/
//for (unsigned int i = 0; i <= 0xFF; i++)
//{
// crc32Lookup[1][i] = (crc32Lookup[0][i] >> 8) ^ crc32Lookup[0][crc32Lookup[0][i] & 0xFF];
// crc32Lookup[2][i] = (crc32Lookup[1][i] >> 8) ^ crc32Lookup[0][crc32Lookup[1][i] & 0xFF];
// crc32Lookup[3][i] = (crc32Lookup[2][i] >> 8) ^ crc32Lookup[0][crc32Lookup[2][i] & 0xFF];
// crc32Lookup[4][i] = (crc32Lookup[3][i] >> 8) ^ crc32Lookup[0][crc32Lookup[3][i] & 0xFF];
// crc32Lookup[5][i] = (crc32Lookup[4][i] >> 8) ^ crc32Lookup[0][crc32Lookup[4][i] & 0xFF];
// crc32Lookup[6][i] = (crc32Lookup[5][i] >> 8) ^ crc32Lookup[0][crc32Lookup[5][i] & 0xFF];
// crc32Lookup[7][i] = (crc32Lookup[6][i] >> 8) ^ crc32Lookup[0][crc32Lookup[6][i] & 0xFF];
//}
{ 0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,0x706AF48F,0xE963A535,0x9E6495A3,
0x0EDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x09B64C2B,0x7EB17CBD,0xE7B82D07,0x90BF1D91,
0x1DB71064,0x6AB020F2,0xF3B97148,0x84BE41DE,0x1ADAD47D,0x6DDDE4EB,0xF4D4B551,0x83D385C7,
0x136C9856,0x646BA8C0,0xFD62F97A,0x8A65C9EC,0x14015C4F,0x63066CD9,0xFA0F3D63,0x8D080DF5,
0x3B6E20C8,0x4C69105E,0xD56041E4,0xA2677172,0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,
0x35B5A8FA,0x42B2986C,0xDBBBC9D6,0xACBCF940,0x32D86CE3,0x45DF5C75,0xDCD60DCF,0xABD13D59,
0x26D930AC,0x51DE003A,0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,0xCFBA9599,0xB8BDA50F,
0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,0x2F6F7C87,0x58684C11,0xC1611DAB,0xB6662D3D,
0x76DC4190,0x01DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,0x9FBFE4A5,0xE8B8D433,
0x7807C9A2,0x0F00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x086D3D2D,0x91646C97,0xE6635C01,
0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,0x6C0695ED,0x1B01A57B,0x8208F4C1,0xF50FC457,
0x65B0D9C6,0x12B7E950,0x8BBEB8EA,0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,0xFBD44C65,
0x4DB26158,0x3AB551CE,0xA3BC0074,0xD4BB30E2,0x4ADFA541,0x3DD895D7,0xA4D1C46D,0xD3D6F4FB,
0x4369E96A,0x346ED9FC,0xAD678846,0xDA60B8D0,0x44042D73,0x33031DE5,0xAA0A4C5F,0xDD0D7CC9,
0x5005713C,0x270241AA,0xBE0B1010,0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,0xCE61E49F,
0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,0x2EB40D81,0xB7BD5C3B,0xC0BA6CAD,
0xEDB88320,0x9ABFB3B6,0x03B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x04DB2615,0x73DC1683,
0xE3630B12,0x94643B84,0x0D6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,
0xF00F9344,0x8708A3D2,0x1E01F268,0x6906C2FE,0xF762575D,0x806567CB,0x196C3671,0x6E6B06E7,
0xFED41B76,0x89D32BE0,0x10DA7A5A,0x67DD4ACC,0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,
0xD6D6A3E8,0xA1D1937E,0x38D8C2C4,0x4FDFF252,0xD1BB67F1,0xA6BC5767,0x3FB506DD,0x48B2364B,
0xD80D2BDA,0xAF0A1B4C,0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,0x316E8EEF,0x4669BE79,
0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,0xCC0C7795,0xBB0B4703,0x220216B9,0x5505262F,
0xC5BA3BBE,0xB2BD0B28,0x2BB45A92,0x5CB36A04,0xC2D7FFA7,0xB5D0CF31,0x2CD99E8B,0x5BDEAE1D,
0x9B64C2B0,0xEC63F226,0x756AA39C,0x026D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x05005713,
0x95BF4A82,0xE2B87A14,0x7BB12BAE,0x0CB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,
0x86D3D2D4,0xF1D4E242,0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,0x18B74777,
0x88085AE6,0xFF0F6A70,0x66063BCA,0x11010B5C,0x8F659EFF,0xF862AE69,0x616BFFD3,0x166CCF45,
0xA00AE278,0xD70DD2EE,0x4E048354,0x3903B3C2,0xA7672661,0xD06016F7,0x4969474D,0x3E6E77DB,
0xAED16A4A,0xD9D65ADC,0x40DF0B66,0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,0x47B2CF7F,0x30B5FFE9,
0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,0xCDD70693,0x54DE5729,0x23D967BF,
0xB3667A2E,0xC4614AB8,0x5D681B02,0x2A6F2B94,0xB40BBE37,0xC30C8EA1,0x5A05DF1B,0x2D02EF8D },
{ 0x00000000,0x191B3141,0x32366282,0x2B2D53C3,0x646CC504,0x7D77F445,0x565AA786,0x4F4196C7,
0xC8D98A08,0xD1C2BB49,0xFAEFE88A,0xE3F4D9CB,0xACB54F0C,0xB5AE7E4D,0x9E832D8E,0x87981CCF,
0x4AC21251,0x53D92310,0x78F470D3,0x61EF4192,0x2EAED755,0x37B5E614,0x1C98B5D7,0x05838496,