Reply To: HTTP Redirection

[Jaze]

I have recalculated TCP checksum also. When sending packet I change desination IP and when recieving I change source IP(as was described in some topic here). Redirection of telnet, ping works fine and http redirection is not(( here is code

void filter()

{

WaitForSingleObject ( hEvent, INFINITE );

ResetEvent(hEvent);

while (api->ReadPacket(request))

{



if (buffer->m_dwDeviceFlags == PACKET_FLAG_ON_SEND)

{

printf("Attemp to send...n");

parsePacketHeaders(buffer);

api->SendPacketToAdapter(request);

}

if (buffer->m_dwDeviceFlags == PACKET_FLAG_ON_RECEIVE)

{

printf("Recieved...n");

parsePacketHeaders(buffer);

api->SendPacketToMstcp(request);

}



}



}



PINTERMEDIATE_BUFFER parsePacketHeaders   ( PINTERMEDIATE_BUFFER pBuffer )

{

ether_header_ptr pEthernet = (ether_header_ptr)&pBuffer->m_IBuffer;



if(ntohs(pEthernet->h_proto) == ETH_P_IP)

{

iphdr_ptr pIp = NULL;

tcphdr_ptr pTcp = NULL;

pIp = (iphdr_ptr)&pBuffer->m_IBuffer[sizeof(ether_header)];

UCHAR IpProto = pIp->ip_p;



if(IpProto == IPPROTO_TCP)

{

//pTcp = (tcphdr_ptr)(((PUCHAR)pIp) + sizeof(DWORD)*pIp->ip_hl);

}//tcp??



//redirection here

if ((pIp->ip_dst.S_un.S_un_b.s_b3 == 32) & (pIp->ip_dst.S_un.S_un_b.s_b4 == 14))

{

pIp->ip_dst.S_un.S_un_b.s_b4 = 9;

pIp->ip_dst.S_un.S_un_b.s_b3 = 32;

recalculateIPChecksum(pBuffer);

recalculateTCPChecksum(pBuffer);

}

if ((pIp->ip_src.S_un.S_un_b.s_b3 == 32) & (pIp->ip_src.S_un.S_un_b.s_b4 == 9))

{

pIp->ip_src.S_un.S_un_b.s_b4 = 14;

pIp->ip_src.S_un.S_un_b.s_b3 = 32;

recalculateIPChecksum(pBuffer);

recalculateTCPChecksum(pBuffer);

}

}





return pBuffer;



}

SerpentFly – ты русский? Если да – то пиши по-русски)) А то я думал тут все из-за бугра.
Еще ethreal ом посмотрел – модифицированные http пакеты не выходят(( просто Ip(ping) telnet – нормально.