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stunlib.c
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stunlib.c
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/*
Copyright 2014 Cisco. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list
of conditions and the following disclaimer in the documentation and/or other materials
provided with the distribution.
THIS SOFTWARE IS PROVIDED BY CISCO ''AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
The views and conclusions contained in the software and documentation are those of the
authors and should not be interpreted as representing official policies, either expressed
or implied, of Cisco.
*/
#include "stunlib.h"
#if defined(__APPLE__)
# define COMMON_DIGEST_FOR_OPENSSL
# include <CommonCrypto/CommonDigest.h>
# include <CommonCrypto/CommonHMAC.h>
# define SHA1 CC_SHA1
#else
#include <openssl/md5.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#endif
#include <zlib.h>
#include <stdlib.h>
#include <string.h>
/**
Defines a STUN Message object
<pre>
.---------------------. /|\ /|\
| STUN Header | | |
|---------------------| | |
| .... | |--------. |
| N Attributes | | | |----.
| .... | \|/ | | |
|---------------------| | | |
| MESSAGE-INTEGRITY | <-(HMAC-SHA1)--' \|/ |
|---------------------| |
| FINGERPRINT | <-(CRC-32)---------------'
'---------------------'
</pre>
(ASCII art from Alfred E. Heggestad (libre) (BSD license)
*/
static const uint8_t StunCookie[] = STUN_MAGIC_COOKIE_ARRAY;
static const size_t StunCookieSize = sizeof(StunCookie)/sizeof(StunCookie[0]);
uint32_t stunlib_calculateFingerprint(const uint8_t *buf, size_t len);
/********************************
* Local helper funcs
********************************/
static void printError(FILE *stream, const char *fmt, ...)
{
va_list ap;
va_start(ap,fmt);
vfprintf(stream, fmt, ap);
fflush(stream);
va_end(ap);
}
/*
* Generic encode/decode stuff
*/
static void write_8(uint8_t **bufPtr, const uint8_t v)
{
**bufPtr = v;
(*bufPtr)++;
}
static void write_8n(uint8_t **bufPtr, const uint8_t *v, uint32_t len)
{
memcpy(*bufPtr, v, len);
*bufPtr += len;
}
static void write_16(uint8_t **bufPtr, const uint16_t v)
{
**bufPtr = (v >> 8) & 0xff;
(*bufPtr)++;
**bufPtr = v & 0xff;
(*bufPtr)++;
}
static void write_32(uint8_t **bufPtr, const uint32_t v)
{
**bufPtr = (v >> 24) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 16) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 8) & 0xff;
(*bufPtr)++;
**bufPtr = v & 0xff;
(*bufPtr)++;
}
static void write_64(uint8_t **bufPtr, const uint64_t v)
{
**bufPtr = (v >> 56) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 48) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 40) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 32) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 24) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 16) & 0xff;
(*bufPtr)++;
**bufPtr = (v >> 8) & 0xff;
(*bufPtr)++;
**bufPtr = v & 0xff;
(*bufPtr)++;
}
static void write_8_xor(uint8_t **bufPtr, const uint8_t v, uint8_t *xorId)
{
**bufPtr = v ^ xorId[0];
(*bufPtr)++;
}
static void write_16_xor(uint8_t **bufPtr, const uint16_t v, uint8_t *xorId)
{
**bufPtr = ((v >> 8) & 0xff) ^ xorId[0];
(*bufPtr)++;
**bufPtr = (v & 0xff) ^ xorId[1];
(*bufPtr)++;
}
static void write_32_xor(uint8_t **bufPtr, const uint32_t v, uint8_t *xorId)
{
**bufPtr = ((v >> 24) & 0xff) ^ xorId[0];
(*bufPtr)++;
**bufPtr = ((v >> 16) & 0xff) ^ xorId[1];
(*bufPtr)++;
**bufPtr = ((v >> 8) & 0xff) ^ xorId[2];
(*bufPtr)++;
**bufPtr = (v & 0xff) ^ xorId[3];
(*bufPtr)++;
}
static void read_8(const uint8_t **bufPtr, uint8_t *v)
{
*v = **bufPtr;
(*bufPtr)++;
}
static void read_8n(const uint8_t **bufPtr, uint8_t *v, uint32_t len)
{
memcpy(v, *bufPtr, len);
*bufPtr += len;
}
static void read_16(const uint8_t **bufPtr, uint16_t *v)
{
*v = ((**bufPtr << 8) & 0xFF00);
(*bufPtr)++;
*v |= (**bufPtr) & 0x00FF;
(*bufPtr)++;
}
static void read_32(const uint8_t **bufPtr, uint32_t *v)
{
*v = ((**bufPtr << 24) & 0xFF000000);
(*bufPtr)++;
*v |= ((**bufPtr << 16) & 0x00FF0000);
(*bufPtr)++;
*v |= ((**bufPtr << 8) & 0x0000FF00);
(*bufPtr)++;
*v |= (**bufPtr) & 0x000000FF;
(*bufPtr)++;
}
static void read_64(const uint8_t **bufPtr, uint64_t *v)
{
*v = (((uint64_t)**bufPtr << 56) & 0xFF00000000000000ll);
(*bufPtr)++;
*v |= (((uint64_t)**bufPtr << 48) & 0x00FF000000000000ll);
(*bufPtr)++;
*v |= (((uint64_t)**bufPtr << 40) & 0x0000FF0000000000ll);
(*bufPtr)++;
*v |= (((uint64_t)**bufPtr << 32) & 0x000000FF00000000ll);
(*bufPtr)++;
*v |= (((uint64_t)**bufPtr << 24) & 0x00000000FF000000ll);
(*bufPtr)++;
*v |= (((uint64_t)**bufPtr << 16) & 0x0000000000FF0000ll);
(*bufPtr)++;
*v |= (((uint64_t)**bufPtr << 8) & 0x000000000000FF00ll);
(*bufPtr)++;
*v |= ((uint64_t)**bufPtr) & 0x0FF;
(*bufPtr)++;
}
static void read_8_xor(const uint8_t **bufPtr, uint8_t *v, uint8_t *xorId)
{
*v = **bufPtr ^ xorId[0];
(*bufPtr)++;
}
static void read_16_xor(const uint8_t **bufPtr, uint16_t *v, uint8_t *xorId)
{
*v = (((uint16_t)(**bufPtr ^ xorId[0])) << 8) & 0xFF00;
(*bufPtr)++;
*v |= ((uint16_t)(**bufPtr ^ xorId[1])) & 0x00FF;
(*bufPtr)++;
}
static void read_32_xor(const uint8_t **bufPtr, uint32_t *v, uint8_t *xorId)
{
*v = (((uint32_t)(**bufPtr ^ xorId[0])) << 24) & 0xFF000000;
(*bufPtr)++;
*v |= (((uint32_t)(**bufPtr ^ xorId[1])) << 16) & 0x00FF0000;
(*bufPtr)++;
*v |= (((uint32_t)(**bufPtr ^ xorId[2])) << 8) & 0x0000FF00;
(*bufPtr)++;
*v |= ((uint32_t)(**bufPtr ^ xorId[3])) & 0x00FF;
(*bufPtr)++;
}
#if 0
static void dumpbuff(char *s, uint8_t *buf, uint32_t len)
{
uint32_t i;
printError("%s\n", s);
for (i=0; i < len; i++)
{
printError("%02x,", buf[i]);
if (i%10 == 0)
printError("\n");
}
}
#endif
char const *stunlib_getMessageName(uint16_t msgType)
{
switch (msgType)
{
/* std stun */
case STUN_MSG_BindRequestMsg: return "BindRequest";
case STUN_MSG_BindResponseMsg: return "BindResponse";
case STUN_MSG_BindIndicationMsg: return "BindInd";
case STUN_MSG_BindErrorResponseMsg: return "BindErrorResponse";
case STUN_MSG_AllocateRequestMsg: return "AllocateRequest";
case STUN_MSG_AllocateResponseMsg: return "AllocateResponse";
case STUN_MSG_AllocateErrorResponseMsg: return "AllocateErrorResponse";
case STUN_MSG_CreatePermissionRequestMsg: return "CreatePermissionReq";
case STUN_MSG_CreatePermissionResponseMsg: return "CreatePermissionResp";
case STUN_MSG_CreatePermissionErrorResponseMsg: return "CreatePermissionError";
case STUN_MSG_ChannelBindRequestMsg: return "ChannelBindRequest";
case STUN_MSG_ChannelBindResponseMsg: return "ChannelBindResponse";
case STUN_MSG_ChannelBindErrorResponseMsg: return "ChannelBindErrorResponse";
case STUN_MSG_RefreshRequestMsg: return "RefreshRequest";
case STUN_MSG_RefreshResponseMsg: return "RefreshResponse";
case STUN_MSG_RefreshErrorResponseMsg: return "RefreshErrorResponse";
case STUN_MSG_DataIndicationMsg: return "DataIndication";
case STUN_MSG_SendIndicationMsg: return "STUN_MSG_SendInd";
case STUN_PathDiscoveryRequestMsg: return "PathDiscReq";
case STUN_PathDiscoveryResponseMsg: return "PathDiscResp";
case STUN_PathDiscoveryErrorResponseMsg: return "PathDiscErrorResp";
default: return "???";
}
}
/* calculate number of padding bytes for a given alignment */
static uint32_t calcPadLen(uint32_t len, uint32_t allignment)
{
return (allignment -(len % allignment))%allignment;
}
/*** ENCODING ****/
static bool
stunEncodeHeader(StunMsgHdr *pMsgHdr, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 20) return false;
write_16(pBuf, pMsgHdr->msgType);
write_16(pBuf, pMsgHdr->msgLength);
/* cookie */
write_8n(pBuf, StunCookie, StunCookieSize);
/* transaction id */
write_8n(pBuf, pMsgHdr->id.octet, STUN_MSG_ID_SIZE);
*nBufLen -= 20;
return true;
}
static bool
stunEncodeIP4AddrAtr(StunAddress4 *pAddr, uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 12) return false;
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 8); /* Lenght */
write_16(pBuf, STUN_ADDR_IPv4Family); /* 8 bit non used, 8 bit for Family */
write_16(pBuf, pAddr->port);
write_32(pBuf, pAddr->addr);
*nBufLen -= 12;
return true;
}
/* */
static void createXorId(uint8_t *xorId, StunMsgId *pMsgId)
{
/* magic cookie + transaction id */
memcpy(xorId, StunCookie, sizeof(StunCookie));
memcpy(xorId+4, pMsgId, STUN_MSG_ID_SIZE);
}
static bool
stunEncodeIP4AddrAtrXOR(StunAddress4 *pAddr, uint16_t attrtype, uint8_t **pBuf, int *nBufLen, StunMsgId *pMsgId)
{
uint8_t xorId[16];
if (*nBufLen < 12) return false;
createXorId(xorId, pMsgId);
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 8); /* Length */
write_16(pBuf, STUN_ADDR_IPv4Family); /* 8 bit non used, 8 bit for Family */
write_16_xor(pBuf, pAddr->port, xorId);
write_32_xor(pBuf, pAddr->addr, xorId);
*nBufLen -= 12;
return true;
}
static bool
stunEncodeIP6AddrAtr(StunAddress6 *pAddr, uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 24) return false;
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 20); /* Lenght */
write_16(pBuf, STUN_ADDR_IPv6Family); /* 8 bit non used, 8 bit for Family */
write_16(pBuf, pAddr->port);
write_8(pBuf, pAddr->addr[0]);
write_8(pBuf, pAddr->addr[1]);
write_8(pBuf, pAddr->addr[2]);
write_8(pBuf, pAddr->addr[3]);
write_8(pBuf, pAddr->addr[4]);
write_8(pBuf, pAddr->addr[5]);
write_8(pBuf, pAddr->addr[6]);
write_8(pBuf, pAddr->addr[7]);
write_8(pBuf, pAddr->addr[8]);
write_8(pBuf, pAddr->addr[9]);
write_8(pBuf, pAddr->addr[10]);
write_8(pBuf, pAddr->addr[11]);
write_8(pBuf, pAddr->addr[12]);
write_8(pBuf, pAddr->addr[13]);
write_8(pBuf, pAddr->addr[14]);
write_8(pBuf, pAddr->addr[15]);
*nBufLen -= 24;
return true;
}
static bool
stunEncodeIP6AddrAtrXOR(StunAddress6 *pAddr, uint16_t attrtype, uint8_t **pBuf, int *nBufLen, StunMsgId *pMsgId)
{
uint8_t xorId[16];
createXorId(xorId, pMsgId);
if (*nBufLen < 24) return false;
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 20); /* Lenght */
write_16(pBuf, STUN_ADDR_IPv6Family); /* 8 bit non used, 8 bit for Family (always IPv4) or? */
write_16_xor(pBuf, pAddr->port, xorId);
write_8_xor(pBuf, pAddr->addr[0], xorId);
write_8_xor(pBuf, pAddr->addr[1], xorId +1);
write_8_xor(pBuf, pAddr->addr[2], xorId +2);
write_8_xor(pBuf, pAddr->addr[3], xorId +3);
write_8_xor(pBuf, pAddr->addr[4], xorId +4);
write_8_xor(pBuf, pAddr->addr[5], xorId +5);
write_8_xor(pBuf, pAddr->addr[6], xorId +6);
write_8_xor(pBuf, pAddr->addr[7], xorId +7);
write_8_xor(pBuf, pAddr->addr[8], xorId +8);
write_8_xor(pBuf, pAddr->addr[9], xorId +9);
write_8_xor(pBuf, pAddr->addr[10], xorId +10);
write_8_xor(pBuf, pAddr->addr[11], xorId +11);
write_8_xor(pBuf, pAddr->addr[12], xorId +12);
write_8_xor(pBuf, pAddr->addr[13], xorId +13);
write_8_xor(pBuf, pAddr->addr[14], xorId +14);
write_8_xor(pBuf, pAddr->addr[15], xorId +15);
*nBufLen -= 24;
return true;
}
static bool
stunEncodeIPAddrAtr(StunIPAddress *pAddr, uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
if (pAddr && pAddr->familyType == STUN_ADDR_IPv4Family)
return stunEncodeIP4AddrAtr(&pAddr->addr.v4, attrtype, pBuf, nBufLen);
else if (pAddr && pAddr->familyType == STUN_ADDR_IPv6Family)
return stunEncodeIP6AddrAtr(&pAddr->addr.v6, attrtype, pBuf, nBufLen);
else
printError(stderr, "unknown IP family type (%02x) to encode!\n", (pAddr ? pAddr->familyType : 0xdead));
return false;
}
static bool
stunEncodeIPAddrAtrXOR(StunIPAddress *pAddr, uint16_t attrtype, uint8_t **pBuf, int *nBufLen, StunMsgId *pMsgId)
{
if (pAddr && pAddr->familyType == STUN_ADDR_IPv4Family)
return stunEncodeIP4AddrAtrXOR(&pAddr->addr.v4, attrtype, pBuf, nBufLen, pMsgId);
else if (pAddr && pAddr->familyType == STUN_ADDR_IPv6Family)
return stunEncodeIP6AddrAtrXOR(&pAddr->addr.v6, attrtype, pBuf, nBufLen, pMsgId);
else
printError(stderr, "unknown IP family type (%x) to encode!\n", (pAddr ? pAddr->familyType : 0xdead));
return false;
}
static bool
stunEncodeValueAtr(StunAtrValue *pChReq, uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 4); /* Length */
write_32(pBuf, pChReq->value);
*nBufLen -= 8;
return true;
}
static bool
stunEncodeChannelAtr(StunAtrChannelNumber *channelAtr, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
write_16(pBuf, STUN_ATTR_ChannelNumber); /* Attr type */
write_16(pBuf, 4); /* Length */
write_16(pBuf, channelAtr->channelNumber); /* channel */
write_16(pBuf, channelAtr->rffu); /* reserved */
*nBufLen -= 8;
return true;
}
static bool
stunEncodeDoubleValueAtr(StunAtrDoubleValue *pChReq, uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 12) return false;
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 8); /* Length */
write_64(pBuf, pChReq->value);
*nBufLen -= 12;
return true;
}
static bool stunEncodeStringAtrAlligned(StunAtrString *pString, uint16_t attrtype, uint8_t **pBuf, int *nBufLen, uint32_t allignment)
{
uint32_t padLen = calcPadLen(pString->sizeValue, allignment);
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, (pString->sizeValue)); /* Attr length */
write_8n(pBuf, (uint8_t*)pString->value, pString->sizeValue);
if (padLen) memset(*pBuf, pString->padChar, padLen);
*pBuf += padLen;
*nBufLen -= pString->sizeValue+padLen+4;
return true;
}
static bool stunEncodeStringAtr(StunAtrString *pString, uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
return stunEncodeStringAtrAlligned(pString,
attrtype,
pBuf,
nBufLen,
STUN_STRING_ALLIGNMENT);
}
static bool
stunEncodeIntegrityAtr(StunAtrIntegrity *pIntg, uint8_t **pBuf, int *nBufLen, int packetLen)
{
if (*nBufLen < 24) return false;
/*Message Integrity is located offset bytes from the start of the packet.
This is calculated by taking, whats left of packet(nBufLen), from the packet len.
pIntg->offset = (packetLen - *nBufLen);*/
if (pIntg->offset == 0)
{
pIntg->offset = (packetLen - *nBufLen);
}
write_16(pBuf, STUN_ATTR_MessageIntegrity); /* Attr type */
write_16(pBuf, 20); /* Value length */
write_8n(pBuf, pIntg->hash, 20);
*nBufLen -= 24;
return true;
}
static bool
stunEncodeFingerprintAtr(uint32_t fingerprint, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
write_16(pBuf, STUN_ATTR_FingerPrint); /* Attr type */
write_16(pBuf, 4); /* Length */
write_32(pBuf, fingerprint);
*nBufLen -= 8;
return true;
}
static bool
stunEncodeErrorAtrAlligned(StunAtrError *pError, uint8_t **pBuf, int *nBufLen, uint32_t allignment, char padChar)
{
uint32_t padLen = calcPadLen(pError->sizeReason, allignment);
write_16(pBuf, STUN_ATTR_ErrorCode); /* Attr type */
write_16(pBuf, (4+pError->sizeReason+padLen)); /* Value length */
write_16(pBuf, 0); /* The pad */
write_8(pBuf, pError->errorClass & 0x7);
write_8(pBuf, pError->number); /* Error number 0-99 */
write_8n(pBuf, (uint8_t*)pError->reason, pError->sizeReason);
if (padLen) memset(*pBuf, padChar, padLen); /* Pad rest with space */
*pBuf += padLen;
*nBufLen -= 4+4+pError->sizeReason+padLen;
return true;
}
static bool stunEncodeErrorAtr(StunAtrError *pError, uint8_t **pBuf, int *nBufLen)
{
return stunEncodeErrorAtrAlligned(pError,
pBuf,
nBufLen,
STUN_STRING_ALLIGNMENT,
pError->padChar);
}
static bool
stunEncodeUnknownAtr(StunAtrUnknown *pUnk, uint8_t **pBuf, int *nBufLen)
{
int i;
int rest = pUnk->numAttributes%2;
if (*nBufLen < 4 + ((pUnk->numAttributes+rest)*2)) return false;
write_16(pBuf, STUN_ATTR_UnknownAttribute);
write_16(pBuf, ((pUnk->numAttributes)*2));
for (i = 0; i < pUnk->numAttributes; i++)
write_16(pBuf, pUnk->attrType[i]);
if (rest) write_16(pBuf, 0);
*nBufLen -= 4 + ((pUnk->numAttributes+rest)*2);
return true;
}
static bool
stunEncodeDataAtr(StunData *pData, uint8_t **pBuf, int *nBufLen)
{
uint32_t residue;
uint32_t padding;
residue = padding = 0;
/* padding/alignment */
residue = pData->dataLen % 4;
if (residue > 0)
padding = 4 - residue;
if ((uint32_t)(*nBufLen) < 4+pData->dataLen+padding)
{
printError(stderr, "<stunEncodeDataAtr> Unable to encode data attr %d < 4 + %d + %d\n",
(uint32_t)(*nBufLen), pData->dataLen,padding);
return false;
}
write_16(pBuf, STUN_ATTR_Data); /* Attr type */
write_16(pBuf, pData->dataLen); /* Length */
/* If wanting to append data header to front of existing packet (avoid a copy)
* then StunData struct will have been set-up with just the data len (and the pData NULL)
* it is then assumed that what follows (in *pBuf) is the data.
*/
if (pData->pData != NULL)
{
write_8n(pBuf, pData->pData, pData->dataLen);
if (residue > 0)
memset(*pBuf, '\xFF', padding);
}
else
{
if (residue > 0)
memset(*pBuf+pData->dataLen, '\xFF', padding);
}
*pBuf += padding;
*nBufLen -= (pData->dataLen+4)+padding;
return true;
}
static bool
stunEncodeFlagAtr(uint16_t attrtype, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
write_16(pBuf, attrtype); /* Attr type */
write_16(pBuf, 0); /* Length */
*nBufLen -= 4;
return true;
}
static bool
stunEncodeRequestedTransport(StunAtrRequestedTransport *pReqTrnsp, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
write_16(pBuf, (uint8_t)STUN_ATTR_RequestedTransport); /* Attr type */
write_16(pBuf, 4); /* Length */
write_8(pBuf, pReqTrnsp->protocol); /* protocol */
write_8n(pBuf, pReqTrnsp->rffu, sizeof(pReqTrnsp->rffu)); /* reserved */
*nBufLen -= 8;
return true;
}
static bool
stunEncodeRequestedAddrFamily(StunAttrRequestedAddrFamily *pReqAddrFam, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
write_16(pBuf, (uint8_t)STUN_ATTR_RequestedAddrFamily); /* Attr type */
write_16(pBuf, 4); /* Length */
write_8(pBuf, pReqAddrFam->family); /* family */
write_8n(pBuf, pReqAddrFam->rffu, sizeof(pReqAddrFam->rffu)); /* reserved */
*nBufLen -= 8;
return true;
}
static bool
stunEncodeEvenPort(StunAtrEvenPort *pEvenPort, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
write_16(pBuf, STUN_ATTR_EvenPort); /* Attr type with R bit set */
write_16(pBuf, 1); /* Length */
write_8(pBuf, pEvenPort->evenPort);
write_8n(pBuf, pEvenPort->pad, sizeof(pEvenPort->pad));
*nBufLen -= 8;
return true;
}
static bool
stunEncodeStreamType(StunAtrStreamType *pStreamType, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 24) return false;
write_16(pBuf, STUN_ATTR_StreamType); /* Attr type */
write_16(pBuf, 3); /* Length */
write_16(pBuf, pStreamType->type);
write_8(pBuf, pStreamType->interactivity);
write_8(pBuf, pStreamType->pad );
*nBufLen -= 8;
return true;
}
static bool
stunEncodeNetworkStatus(StunAtrNetworkStatus *pNetworkStatus, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 32) return false;
write_16(pBuf, STUN_ATTR_NetworkStatus); /* Attr type */
write_16(pBuf, 8); /* Length */
write_8(pBuf, pNetworkStatus->flags);
write_8(pBuf, pNetworkStatus->nodeCnt);
write_16(pBuf, pNetworkStatus->tbd);
write_16(pBuf, pNetworkStatus->upMaxBandwidth);
write_16(pBuf, pNetworkStatus->downMaxBandwidth);
*nBufLen -= 12;
return true;
}
static bool
stunEncodeCiscoNetworkFeedback(StunAtrCiscoNetworkFeedback *ciscoNetFeed, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 32) return false;
write_16(pBuf, STUN_ATTR_Cisco_Network_Feedback); /* Attr type */
write_16(pBuf, 12); /* Length */
write_32(pBuf, ciscoNetFeed->first);
write_32(pBuf, ciscoNetFeed->second);
write_32(pBuf, ciscoNetFeed->third);
*nBufLen -= 16;
return true;
}
static bool
stunEncodeBandwidthUsage(StunAtrBandwidthUsage *pBandwidthUsage, uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
write_16(pBuf, STUN_ATTR_BandwidthUsage); /* Attr type */
write_16(pBuf, 4); /* Length */
write_16(pBuf, pBandwidthUsage->average);
write_16(pBuf, pBandwidthUsage->max);
*nBufLen -= 8;
return true;
}
static uint32_t stunlib_EncodeIndication(
uint8_t msgType,
uint8_t *stunBuf,
uint8_t *dataBuf,
uint32_t maxBufSize,
uint32_t payloadLength,
const struct sockaddr *dstAddr)
{
StunMessage stunMsg;
StunIPAddress activeDstAddr;
int length = 0;
memset(&stunMsg, 0, sizeof(StunMessage));
stunlib_createId(&stunMsg.msgHdr.id, rand(), 0);
if (dstAddr->sa_family == AF_INET){
activeDstAddr.familyType = STUN_ADDR_IPv4Family;
activeDstAddr.addr.v4.port = ntohs(((struct sockaddr_in *)dstAddr)->sin_port);
activeDstAddr.addr.v4.addr = ntohl(((struct sockaddr_in *)dstAddr)->sin_addr.s_addr);
}else if (dstAddr->sa_family == AF_INET6){
activeDstAddr.familyType = STUN_ADDR_IPv6Family;
activeDstAddr.addr.v6.port = ntohs(((struct sockaddr_in6 *)dstAddr)->sin6_port);
memcpy( activeDstAddr.addr.v6.addr ,
((struct sockaddr_in6 *)dstAddr)->sin6_addr.s6_addr,
sizeof(activeDstAddr.addr.v6.addr) );
}else{
return 0;
}
/* STD TURN: sendInd(XorPeerAddr, Data) no integrity */
stunMsg.msgHdr.msgType = msgType;
stunMsg.xorPeerAddrEntries = 1;
memcpy(&stunMsg.xorPeerAddress[0], &activeDstAddr, sizeof(StunIPAddress));
stunMsg.hasData = true;
stunMsg.data.dataLen = payloadLength;
stunMsg.data.pData = dataBuf; /*The data (RTP packet) follows anyway..*/
length = stunlib_encodeMessage(&stunMsg,
stunBuf,
maxBufSize,
NULL, /* no message integrity */
0, /* no message integrity */
NULL); /* stream */
return length;
}
uint32_t stunlib_EncodeSendIndication(
uint8_t *stunBuf,
uint8_t *dataBuf,
uint32_t maxBufSize,
uint32_t payloadLength,
const struct sockaddr *dstAddr)
{
return stunlib_EncodeIndication(
STUN_MSG_SendIndicationMsg,
stunBuf,
dataBuf,
maxBufSize,
payloadLength,
dstAddr);
}
uint32_t stunlib_EncodeDataIndication(
uint8_t *stunBuf,
uint8_t *dataBuf,
uint32_t maxBufSize,
uint32_t payloadLength,
const struct sockaddr *dstAddr)
{
return stunlib_EncodeIndication(
STUN_MSG_DataIndicationMsg,
stunBuf,
dataBuf,
maxBufSize,
payloadLength,
dstAddr);
}
/**** DECODING *****/
static bool
stunDecodeHeader(StunMsgHdr *pMsgHdr, const uint8_t **pBuf, int *nBufLen)
{
memset(pMsgHdr, 0, sizeof(StunMsgHdr));
read_16(pBuf, &pMsgHdr->msgType);
read_16(pBuf, &pMsgHdr->msgLength);
/* cookie */
read_8n(pBuf, pMsgHdr->cookie.octet, sizeof(StunMsgCookie));
/* transaction id */
read_8n(pBuf, pMsgHdr->id.octet, STUN_MSG_ID_SIZE);
*nBufLen -= 20;
return true;
}
static bool
stunDecodeAttributeHead(StunAtrHdr *pAtrHdr, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
read_16(pBuf, &pAtrHdr->type);
read_16(pBuf, &pAtrHdr->length);
*nBufLen -= 4;
return true;
}
static bool stunDecodeStringAtrAlligned(StunAtrString *pStr, const uint8_t **pBuf, int *nBufLen, int atrLen, uint32_t allignment)
{
int len;
uint32_t padLen = calcPadLen(atrLen, allignment);
if (*nBufLen < atrLen)
{
printError(stderr, "stunDecodeStringAtr: failed nBufLen %d atrLen %d\n", *nBufLen, atrLen);
return false;
}
len = min(STUN_MAX_STRING, atrLen);
pStr->sizeValue = len;
read_8n(pBuf, (uint8_t*)pStr->value, len);
*pBuf += padLen;
*nBufLen -= (atrLen+padLen);
return true;
}
static bool stunDecodeStringAtr(StunAtrString *pStr, const uint8_t **pBuf, int *nBufLen, int atrLen)
{
return stunDecodeStringAtrAlligned(pStr,
pBuf,
nBufLen,
atrLen,
STUN_STRING_ALLIGNMENT);
}
static bool
stunDecodeValueAtr(StunAtrValue *pVal, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
read_32(pBuf, &pVal->value);
*nBufLen -= 4;
return true;
}
static bool
stunDecodeChannelAtr(StunAtrChannelNumber *channelAtr, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
read_16(pBuf, &channelAtr->channelNumber);
read_16(pBuf, &channelAtr->rffu);
*nBufLen -= 4;
return true;
}
static bool
stunDecodeEvenPortAtr(StunAtrEvenPort *evenPortAtr, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
read_8(pBuf, &evenPortAtr->evenPort);
read_8n(pBuf, evenPortAtr->pad, sizeof(evenPortAtr->pad));
*nBufLen -= 4;
return true;
}
static bool
stunDecodeRequestedTransportAtr(StunAtrRequestedTransport *reqTransAtr, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
read_8(pBuf, &reqTransAtr->protocol);
read_8n(pBuf, reqTransAtr->rffu, sizeof(reqTransAtr->rffu));
*nBufLen -= 4;
return true;
}
static bool
stunDecodeRequestedAddrFamilyAtr(StunAttrRequestedAddrFamily *reqAddrFamily, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 4) return false;
read_8(pBuf, &reqAddrFamily->family);
read_8n(pBuf, reqAddrFamily->rffu, sizeof(reqAddrFamily->rffu));
*nBufLen -= 4;
return true;
}
static bool
stunDecodeDoubleValueAtr(StunAtrDoubleValue *pVal, const uint8_t **pBuf, int *nBufLen)
{
if (*nBufLen < 8) return false;
read_64(pBuf, &pVal->value);
*nBufLen -= 8;
return true;
}
static bool
stunDecodeIPAddrAtr(StunIPAddress *pAddr, const uint8_t **pBuf, int *nBufLen)
{
uint16_t flagtype;
if (*nBufLen < 2) return false;
read_16(pBuf, &flagtype);
pAddr->familyType = (flagtype & 0xff);
if (pAddr->familyType == STUN_ADDR_IPv4Family)
{
if (*nBufLen < 6) return false;
read_16(pBuf, &pAddr->addr.v4.port);
read_32(pBuf, &pAddr->addr.v4.addr);
*nBufLen -= 8;
}
else if (pAddr->familyType == STUN_ADDR_IPv6Family)
{
if (*nBufLen < 18) return false;
read_16(pBuf, &pAddr->addr.v6.port);
read_8(pBuf, &pAddr->addr.v6.addr[0]);
read_8(pBuf, &pAddr->addr.v6.addr[1]);
read_8(pBuf, &pAddr->addr.v6.addr[2]);
read_8(pBuf, &pAddr->addr.v6.addr[3]);
read_8(pBuf, &pAddr->addr.v6.addr[4]);
read_8(pBuf, &pAddr->addr.v6.addr[5]);
read_8(pBuf, &pAddr->addr.v6.addr[6]);
read_8(pBuf, &pAddr->addr.v6.addr[7]);
read_8(pBuf, &pAddr->addr.v6.addr[8]);
read_8(pBuf, &pAddr->addr.v6.addr[9]);
read_8(pBuf, &pAddr->addr.v6.addr[10]);
read_8(pBuf, &pAddr->addr.v6.addr[11]);
read_8(pBuf, &pAddr->addr.v6.addr[12]);
read_8(pBuf, &pAddr->addr.v6.addr[13]);
read_8(pBuf, &pAddr->addr.v6.addr[14]);
read_8(pBuf, &pAddr->addr.v6.addr[15]);
*nBufLen -= 20;
}
else
{
printError(stderr, "Decode IP: Got unfamiliar IP family type: %02x\n", flagtype & 0xff);
return false;
}