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stun.cxx
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#include <cassert>
#include <cstring>
#include <iostream>
#include <cstdlib>
#include <errno.h>
#ifdef WIN32
#include <winsock2.h>
#include <stdlib.h>
#include <io.h>
#include <time.h>
#else
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <net/if.h>
#endif
#if defined(__sparc__) || defined(WIN32)
#define NOSSL
#endif
#define NOSSL
#include "udp.h"
#include "stun.h"
using namespace std;
static void
computeHmac(char* hmac, const char* input, int length, const char* key, int keySize);
static bool
stunParseAtrAddress( char* body, unsigned int hdrLen, StunAtrAddress4& result )
{
if ( hdrLen != 8 )
{
clog << "hdrLen wrong for Address" <<endl;
return false;
}
result.pad = *body++;
result.family = *body++;
if (result.family == IPv4Family)
{
UInt16 nport;
memcpy(&nport, body, 2); body+=2;
result.ipv4.port = ntohs(nport);
UInt32 naddr;
memcpy(&naddr, body, 4); body+=4;
result.ipv4.addr = ntohl(naddr);
return true;
}
else if (result.family == IPv6Family)
{
clog << "ipv6 not supported" << endl;
}
else
{
clog << "bad address family: " << result.family << endl;
}
return false;
}
static bool
stunParseAtrChangeRequest( char* body, unsigned int hdrLen, StunAtrChangeRequest& result )
{
if ( hdrLen != 4 )
{
clog << "hdr length = " << hdrLen << " expecting " << sizeof(result) << endl;
clog << "Incorrect size for ChangeRequest" << endl;
return false;
}
else
{
memcpy(&result.value, body, 4);
result.value = ntohl(result.value);
return true;
}
}
static bool
stunParseAtrError( char* body, unsigned int hdrLen, StunAtrError& result )
{
if ( hdrLen >= sizeof(result) )
{
clog << "head on Error too large" << endl;
return false;
}
else
{
memcpy(&result.pad, body, 2); body+=2;
result.pad = ntohs(result.pad);
result.errorClass = *body++;
result.number = *body++;
result.sizeReason = hdrLen - 4;
memcpy(&result.reason, body, result.sizeReason);
result.reason[result.sizeReason] = 0;
return true;
}
}
static bool
stunParseAtrUnknown( char* body, unsigned int hdrLen, StunAtrUnknown& result )
{
if ( hdrLen >= sizeof(result) )
{
return false;
}
else
{
if (hdrLen % 4 != 0) return false;
result.numAttributes = hdrLen / 4;
for (int i=0; i<result.numAttributes; i++)
{
memcpy(&result.attrType[i], body, 2); body+=2;
result.attrType[i] = ntohs(result.attrType[i]);
}
return true;
}
}
static bool
stunParseAtrString( char* body, unsigned int hdrLen, StunAtrString& result )
{
if ( hdrLen >= STUN_MAX_STRING )
{
clog << "String is too large" << endl;
return false;
}
else
{
if (hdrLen % 4 != 0)
{
clog << "Bad length string " << hdrLen << endl;
return false;
}
result.sizeValue = hdrLen;
memcpy(&result.value, body, hdrLen);
result.value[hdrLen] = 0;
return true;
}
}
static bool
stunParseAtrIntegrity( char* body, unsigned int hdrLen, StunAtrIntegrity& result )
{
if ( hdrLen != 20)
{
clog << "MessageIntegrity must be 20 bytes" << endl;
return false;
}
else
{
memcpy(&result.hash, body, hdrLen);
return true;
}
}
bool
stunParseMessage( char* buf, unsigned int bufLen, StunMessage& msg, bool verbose)
{
if (verbose) clog << "Received stun message: " << bufLen << " bytes" << endl;
memset(&msg, 0, sizeof(msg));
if (sizeof(StunMsgHdr) > bufLen)
{
clog << "Bad message" << endl;
return false;
}
memcpy(&msg.msgHdr, buf, sizeof(StunMsgHdr));
msg.msgHdr.msgType = ntohs(msg.msgHdr.msgType);
msg.msgHdr.msgLength = ntohs(msg.msgHdr.msgLength);
if (msg.msgHdr.msgLength + sizeof(StunMsgHdr) != bufLen)
{
clog << "Message header length doesn't match message size: "
<< msg.msgHdr.msgLength << " - " << bufLen << endl;
return false;
}
char* body = buf + sizeof(StunMsgHdr);
unsigned int size = msg.msgHdr.msgLength;
//clog << "bytes after header = " << size << endl;
while ( size > 0 )
{
// !jf! should check that there are enough bytes left in the buffer
StunAtrHdr* attr = reinterpret_cast<StunAtrHdr*>(body);
unsigned int attrLen = ntohs(attr->length);
int atrType = ntohs(attr->type);
//if (verbose) clog << "Found attribute type=" << AttrNames[atrType] << " length=" << attrLen << endl;
if ( attrLen+4 > size )
{
clog << "claims attribute is larger than size of message "
<<"(attribute type="<<atrType<<")"<< endl;
return false;
}
body += 4; // skip the length and type in attribute header
size -= 4;
switch ( atrType )
{
case MappedAddress:
msg.hasMappedAddress = true;
if ( stunParseAtrAddress( body, attrLen, msg.mappedAddress )== false )
{
clog << "problem parsing MappedAddress" << endl;
return false;
}
else
{
if (verbose) clog << "MappedAddress = " << msg.mappedAddress.ipv4 << endl;
}
break;
case ResponseAddress:
msg.hasResponseAddress = true;
if ( stunParseAtrAddress( body, attrLen, msg.responseAddress )== false )
{
clog << "problem parsing ResponseAddress" << endl;
return false;
}
else
{
if (verbose) clog << "ResponseAddress = " << msg.responseAddress.ipv4 << endl;
}
break;
case ChangeRequest:
msg.hasChangeRequest = true;
if (stunParseAtrChangeRequest( body, attrLen, msg.changeRequest) == false)
{
clog << "problem parsing ChangeRequest" << endl;
return false;
}
else
{
if (verbose) clog << "ChangeRequest = " << msg.changeRequest.value << endl;
}
break;
case SourceAddress:
msg.hasSourceAddress = true;
if ( stunParseAtrAddress( body, attrLen, msg.sourceAddress )== false )
{
clog << "problem parsing SourceAddress" << endl;
return false;
}
else
{
if (verbose) clog << "SourceAddress = " << msg.sourceAddress.ipv4 << endl;
}
break;
case ChangedAddress:
msg.hasChangedAddress = true;
if ( stunParseAtrAddress( body, attrLen, msg.changedAddress )== false )
{
clog << "problem parsing ChangedAddress" << endl;
return false;
}
else
{
if (verbose) clog << "ChangedAddress = " << msg.changedAddress.ipv4 << endl;
}
break;
case Username:
msg.hasUsername = true;
if (stunParseAtrString( body, attrLen, msg.username) == false)
{
clog << "problem parsing Username" << endl;
return false;
}
else
{
if (verbose) clog << "Username = " << msg.username.value << endl;
}
break;
case Password:
msg.hasPassword = true;
if (stunParseAtrString( body, attrLen, msg.password) == false)
{
clog << "problem parsing Password" << endl;
return false;
}
else
{
if (verbose) clog << "Password = " << msg.password.value << endl;
}
break;
case MessageIntegrity:
msg.hasMessageIntegrity = true;
if (stunParseAtrIntegrity( body, attrLen, msg.messageIntegrity) == false)
{
clog << "problem parsing MessageIntegrity" << endl;
return false;
}
else
{
//if (verbose) clog << "MessageIntegrity = " << msg.messageIntegrity.hash << endl;
}
// read the current HMAC
// look up the password given the user of given the transaction id
// compute the HMAC on the buffer
// decide if they match or not
break;
case ErrorCode:
msg.hasErrorCode = true;
if (stunParseAtrError(body, attrLen, msg.errorCode) == false)
{
clog << "problem parsing ErrorCode" << endl;
return false;
}
else
{
if (verbose) clog << "ErrorCode = " << int(msg.errorCode.errorClass)
<< " " << int(msg.errorCode.number)
<< " " << msg.errorCode.reason << endl;
}
break;
case UnknownAttribute:
msg.hasUnknownAttributes = true;
if (stunParseAtrUnknown(body, attrLen, msg.unknownAttributes) == false)
{
clog << "problem parsing UnknownAttribute" << endl;
return false;
}
break;
case ReflectedFrom:
msg.hasReflectedFrom = true;
if ( stunParseAtrAddress( body, attrLen, msg.reflectedFrom ) == false )
{
clog << "problem parsing ReflectedFrom" << endl;
return false;
}
break;
case XorMappedAddress:
msg.hasXorMappedAddress = true;
if ( stunParseAtrAddress( body, attrLen, msg.xorMappedAddress ) == false )
{
clog << "problem parsing XorMappedAddress" << endl;
return false;
}
else
{
if (verbose) clog << "XorMappedAddress = " << msg.mappedAddress.ipv4 << endl;
}
break;
case XorOnly:
msg.xorOnly = true;
if (verbose)
{
clog << "xorOnly = true" << endl;
}
break;
case ServerName:
msg.hasServerName = true;
if (stunParseAtrString( body, attrLen, msg.serverName) == false)
{
clog << "problem parsing ServerName" << endl;
return false;
}
else
{
if (verbose) clog << "ServerName = " << msg.serverName.value << endl;
}
break;
case SecondaryAddress:
msg.hasSecondaryAddress = true;
if ( stunParseAtrAddress( body, attrLen, msg.secondaryAddress ) == false )
{
clog << "problem parsing secondaryAddress" << endl;
return false;
}
else
{
if (verbose) clog << "SecondaryAddress = " << msg.secondaryAddress.ipv4 << endl;
}
break;
default:
if (verbose) clog << "Unknown attribute: " << atrType << endl;
if ( atrType <= 0x7FFF )
{
return false;
}
}
body += attrLen;
size -= attrLen;
}
return true;
}
static char*
encode16(char* buf, UInt16 data)
{
UInt16 ndata = htons(data);
memcpy(buf, reinterpret_cast<void*>(&ndata), sizeof(UInt16));
return buf + sizeof(UInt16);
}
static char*
encode32(char* buf, UInt32 data)
{
UInt32 ndata = htonl(data);
memcpy(buf, reinterpret_cast<void*>(&ndata), sizeof(UInt32));
return buf + sizeof(UInt32);
}
static char*
encode(char* buf, const char* data, unsigned int length)
{
memcpy(buf, data, length);
return buf + length;
}
static char*
encodeAtrAddress4(char* ptr, UInt16 type, const StunAtrAddress4& atr)
{
ptr = encode16(ptr, type);
ptr = encode16(ptr, 8);
*ptr++ = atr.pad;
*ptr++ = IPv4Family;
ptr = encode16(ptr, atr.ipv4.port);
ptr = encode32(ptr, atr.ipv4.addr);
return ptr;
}
static char*
encodeAtrChangeRequest(char* ptr, const StunAtrChangeRequest& atr)
{
ptr = encode16(ptr, ChangeRequest);
ptr = encode16(ptr, 4);
ptr = encode32(ptr, atr.value);
return ptr;
}
static char*
encodeAtrError(char* ptr, const StunAtrError& atr)
{
ptr = encode16(ptr, ErrorCode);
ptr = encode16(ptr, 6 + atr.sizeReason);
ptr = encode16(ptr, atr.pad);
*ptr++ = atr.errorClass;
*ptr++ = atr.number;
ptr = encode(ptr, atr.reason, atr.sizeReason);
return ptr;
}
static char*
encodeAtrUnknown(char* ptr, const StunAtrUnknown& atr)
{
ptr = encode16(ptr, UnknownAttribute);
ptr = encode16(ptr, 2+2*atr.numAttributes);
for (int i=0; i<atr.numAttributes; i++)
{
ptr = encode16(ptr, atr.attrType[i]);
}
return ptr;
}
static char*
encodeXorOnly(char* ptr)
{
ptr = encode16(ptr, XorOnly );
return ptr;
}
static char*
encodeAtrString(char* ptr, UInt16 type, const StunAtrString& atr)
{
assert(atr.sizeValue % 4 == 0);
ptr = encode16(ptr, type);
ptr = encode16(ptr, atr.sizeValue);
ptr = encode(ptr, atr.value, atr.sizeValue);
return ptr;
}
static char*
encodeAtrIntegrity(char* ptr, const StunAtrIntegrity& atr)
{
ptr = encode16(ptr, MessageIntegrity);
ptr = encode16(ptr, 20);
ptr = encode(ptr, atr.hash, sizeof(atr.hash));
return ptr;
}
unsigned int
stunEncodeMessage( const StunMessage& msg,
char* buf,
unsigned int bufLen,
const StunAtrString& password,
bool verbose)
{
assert(bufLen >= sizeof(StunMsgHdr));
char* ptr = buf;
ptr = encode16(ptr, msg.msgHdr.msgType);
char* lengthp = ptr;
ptr = encode16(ptr, 0);
ptr = encode(ptr, reinterpret_cast<const char*>(msg.msgHdr.id.octet), sizeof(msg.msgHdr.id));
if (verbose) clog << "Encoding stun message: " << endl;
if (msg.hasMappedAddress)
{
if (verbose) clog << "Encoding MappedAddress: " << msg.mappedAddress.ipv4 << endl;
ptr = encodeAtrAddress4 (ptr, MappedAddress, msg.mappedAddress);
}
if (msg.hasResponseAddress)
{
if (verbose) clog << "Encoding ResponseAddress: " << msg.responseAddress.ipv4 << endl;
ptr = encodeAtrAddress4(ptr, ResponseAddress, msg.responseAddress);
}
if (msg.hasChangeRequest)
{
if (verbose) clog << "Encoding ChangeRequest: " << msg.changeRequest.value << endl;
ptr = encodeAtrChangeRequest(ptr, msg.changeRequest);
}
if (msg.hasSourceAddress)
{
if (verbose) clog << "Encoding SourceAddress: " << msg.sourceAddress.ipv4 << endl;
ptr = encodeAtrAddress4(ptr, SourceAddress, msg.sourceAddress);
}
if (msg.hasChangedAddress)
{
if (verbose) clog << "Encoding ChangedAddress: " << msg.changedAddress.ipv4 << endl;
ptr = encodeAtrAddress4(ptr, ChangedAddress, msg.changedAddress);
}
if (msg.hasUsername)
{
if (verbose) clog << "Encoding Username: " << msg.username.value << endl;
ptr = encodeAtrString(ptr, Username, msg.username);
}
if (msg.hasPassword)
{
if (verbose) clog << "Encoding Password: " << msg.password.value << endl;
ptr = encodeAtrString(ptr, Password, msg.password);
}
if (msg.hasErrorCode)
{
if (verbose) clog << "Encoding ErrorCode: class="
<< int(msg.errorCode.errorClass)
<< " number=" << int(msg.errorCode.number)
<< " reason="
<< msg.errorCode.reason
<< endl;
ptr = encodeAtrError(ptr, msg.errorCode);
}
if (msg.hasUnknownAttributes)
{
if (verbose) clog << "Encoding UnknownAttribute: ???" << endl;
ptr = encodeAtrUnknown(ptr, msg.unknownAttributes);
}
if (msg.hasReflectedFrom)
{
if (verbose) clog << "Encoding ReflectedFrom: " << msg.reflectedFrom.ipv4 << endl;
ptr = encodeAtrAddress4(ptr, ReflectedFrom, msg.reflectedFrom);
}
if (msg.hasXorMappedAddress)
{
if (verbose) clog << "Encoding XorMappedAddress: " << msg.xorMappedAddress.ipv4 << endl;
ptr = encodeAtrAddress4 (ptr, XorMappedAddress, msg.xorMappedAddress);
}
if (msg.xorOnly)
{
if (verbose) clog << "Encoding xorOnly: " << endl;
ptr = encodeXorOnly( ptr );
}
if (msg.hasServerName)
{
if (verbose) clog << "Encoding ServerName: " << msg.serverName.value << endl;
ptr = encodeAtrString(ptr, ServerName, msg.serverName);
}
if (msg.hasSecondaryAddress)
{
if (verbose) clog << "Encoding SecondaryAddress: " << msg.secondaryAddress.ipv4 << endl;
ptr = encodeAtrAddress4 (ptr, SecondaryAddress, msg.secondaryAddress);
}
if (password.sizeValue > 0)
{
if (verbose) clog << "HMAC with password: " << password.value << endl;
StunAtrIntegrity integrity;
computeHmac(integrity.hash, buf, int(ptr-buf) , password.value, password.sizeValue);
ptr = encodeAtrIntegrity(ptr, integrity);
}
if (verbose) clog << endl;
encode16(lengthp, UInt16(ptr - buf - sizeof(StunMsgHdr)));
return int(ptr - buf);
}
int
stunRand()
{
// return 32 bits of random stuff
assert( sizeof(int) == 4 );
static bool init=false;
if ( !init )
{
init = true;
UInt64 tick;
#if defined(WIN32)
volatile unsigned int lowtick=0,hightick=0;
__asm
{
rdtsc
mov lowtick, eax
mov hightick, edx
}
tick = hightick;
tick <<= 32;
tick |= lowtick;
#elif defined(__GNUC__) && ( defined(__i686__) || defined(__i386__) )
asm("rdtsc" : "=A" (tick));
#elif defined (__SUNPRO_CC) || defined( __sparc__ )
tick = gethrtime();
#elif defined(__MACH__) || defined(__linux)
int fd=open("/dev/random",O_RDONLY);
read(fd,&tick,sizeof(tick));
closesocket(fd);
#else
# error Need some way to seed the random number generator
#endif
int seed = int(tick);
#ifdef WIN32
srand(seed);
#else
srandom(seed);
#endif
}
#ifdef WIN32
assert( RAND_MAX == 0x7fff );
int r1 = rand();
int r2 = rand();
int ret = (r1<<16) + r2;
return ret;
#else
return random();
#endif
}
/// return a random number to use as a port
int
stunRandomPort()
{
int min=0x4000;
int max=0x7FFF;
int ret = stunRand();
ret = ret|min;
ret = ret&max;
return ret;
}
#ifdef NOSSL
static void
computeHmac(char* hmac, const char* input, int length, const char* key, int sizeKey)
{
strncpy(hmac,"hmac-not-implemented",20);
}
#else
#include <openssl/hmac.h>
static void
computeHmac(char* hmac, const char* input, int length, const char* key, int sizeKey)
{
unsigned int resultSize=0;
HMAC(EVP_sha1(),
key, sizeKey,
reinterpret_cast<const unsigned char*>(input), length,
reinterpret_cast<unsigned char*>(hmac), &resultSize);
assert(resultSize == 20);
}
#endif
static void
toHex(const char* buffer, int bufferSize, char* output)
{
static char hexmap[] = "0123456789abcdef";
const char* p = buffer;
char* r = output;
for (int i=0; i < bufferSize; i++)
{
unsigned char temp = *p++;
int hi = (temp & 0xf0)>>4;
int low = (temp & 0xf);
*r++ = hexmap[hi];
*r++ = hexmap[low];
}
*r = 0;
}
void
stunCreateUserName(const StunAddress4& source, StunAtrString* username)
{
UInt64 time = stunGetSystemTimeSecs();
time -= (time % 20*60);
//UInt64 hitime = time >> 32;
UInt64 lotime = time & 0xFFFFFFFF;
char buffer[1024];
sprintf(buffer,
"%08x:%08x:%08x:",
UInt32(source.addr),
UInt32(stunRand()),
UInt32(lotime));
assert( strlen(buffer) < 1024 );
assert(strlen(buffer) + 41 < STUN_MAX_STRING);
char hmac[20];
char key[] = "Jason";
computeHmac(hmac, buffer, strlen(buffer), key, strlen(key) );
char hmacHex[41];
toHex(hmac, 20, hmacHex );
hmacHex[40] =0;
strcat(buffer,hmacHex);
int l = strlen(buffer);
assert( l+1 < STUN_MAX_STRING );
assert( l%4 == 0 );
username->sizeValue = l;
memcpy(username->value,buffer,l);
username->value[l]=0;
//if (verbose) clog << "computed username=" << username.value << endl;
}
void
stunCreatePassword(const StunAtrString& username, StunAtrString* password)
{
char hmac[20];
char key[] = "Fluffy";
//char buffer[STUN_MAX_STRING];
computeHmac(hmac, username.value, strlen(username.value), key, strlen(key));
toHex(hmac, 20, password->value);
password->sizeValue = 40;
password->value[40]=0;
//clog << "password=" << password->value << endl;
}
UInt64
stunGetSystemTimeSecs()
{
UInt64 time=0;
#if defined(WIN32)
SYSTEMTIME t;
// CJ TODO - this probably has bug on wrap around every 24 hours
GetSystemTime( &t );
time = (t.wHour*60+t.wMinute)*60+t.wSecond;
#else
struct timeval now;
gettimeofday( &now , NULL );
//assert( now );
time = now.tv_sec;
#endif
return time;
}
ostream& operator<< ( ostream& strm, const UInt128& r )
{
strm << int(r.octet[0]);
for ( int i=1; i<16; i++ )
{
strm << ':' << int(r.octet[i]);
}
return strm;
}
ostream&
operator<<( ostream& strm, const StunAddress4& addr)
{
UInt32 ip = addr.addr;
strm << ((int)(ip>>24)&0xFF) << ".";
strm << ((int)(ip>>16)&0xFF) << ".";
strm << ((int)(ip>> 8)&0xFF) << ".";
strm << ((int)(ip>> 0)&0xFF) ;
strm << ":" << addr.port;
return strm;
}
// returns true if it scucceeded
bool
stunParseHostName( char* peerName,
UInt32& ip,
UInt16& portVal,
UInt16 defaultPort )
{
in_addr sin_addr;
char host[512];
strncpy(host,peerName,512);
host[512-1]='\0';
char* port = NULL;
int portNum = defaultPort;
// pull out the port part if present.
char* sep = strchr(host,':');
if ( sep == NULL )
{
portNum = defaultPort;
}
else
{
*sep = '\0';
port = sep + 1;
// set port part
char* endPtr=NULL;
portNum = strtol(port,&endPtr,10);
if ( endPtr != NULL )
{
if ( *endPtr != '\0' )
{
portNum = defaultPort;
}
}
}
if ( portNum < 1024 ) return false;
if ( portNum >= 0xFFFF ) return false;
// figure out the host part
struct hostent* h;
#ifdef WIN32
assert( strlen(host) >= 1 );
if ( isdigit( host[0] ) )
{
// assume it is a ip address
unsigned long a = inet_addr(host);
//cerr << "a=0x" << hex << a << dec << endl;
ip = ntohl( a );
}
else
{
// assume it is a host name
h = gethostbyname( host );
if ( h == NULL )
{
int err = getErrno();
std::cerr << "error was " << err << std::endl;
assert( err != WSANOTINITIALISED );
ip = ntohl( 0x7F000001L );
return false;
}
else
{
sin_addr = *(struct in_addr*)h->h_addr;
ip = ntohl( sin_addr.s_addr );
}
}
#else
h = gethostbyname( host );
if ( h == NULL )
{
int err = getErrno();
std::cerr << "error was " << err << std::endl;
ip = ntohl( 0x7F000001L );
return false;
}
else
{
sin_addr = *(struct in_addr*)h->h_addr;
ip = ntohl( sin_addr.s_addr );
}
#endif
portVal = portNum;
return true;
}
bool
stunParseServerName( char* name, StunAddress4& addr)
{
assert(name);
// TODO - put in DNS SRV stuff.
bool ret = stunParseHostName( name, addr.addr, addr.port, 3478);
if ( ret != true )
{
addr.port=0xFFFF;
}
return ret;
}
static void
stunCreateErrorResponse(StunMessage& response, int cl, int number, const char* msg)
{
response.msgHdr.msgType = BindErrorResponseMsg;
response.hasErrorCode = true;
response.errorCode.errorClass = cl;
response.errorCode.number = number;
strcpy(response.errorCode.reason, msg);
}
#if 0
static void
stunCreateSharedSecretErrorResponse(StunMessage& response, int cl, int number, const char* msg)
{
response.msgHdr.msgType = SharedSecretErrorResponseMsg;
response.hasErrorCode = true;
response.errorCode.errorClass = cl;
response.errorCode.number = number;
strcpy(response.errorCode.reason, msg);
}
#endif
static void