Hi guys here is my problem.I am trying to send ICMP packets to a HOST using WINSOK.So here is my code:
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#define IP_RECORD_ROUTE 0x7
//
// IP header structure
//
typedef struct _iphdr
{
unsigned int h_len:4; // Length of the header
unsigned int version:4; // Version of IP
unsigned char tos; // Type of service
unsigned short total_len; // Total length of the packet
unsigned short ident; // Unique identifier
unsigned short frag_and_flags; // Flags
unsigned char ttl; // Time to live
unsigned char proto; // Protocol (TCP, UDP, etc.)
unsigned short checksum; // IP checksum
unsigned int sourceIP;
unsigned int destIP;
} IpHeader;
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
#define ICMP_MIN 8 // Minimum 8-byte ICMP packet (header)
//
// ICMP header structure
//
typedef struct _icmphdr
{
BYTE i_type;
BYTE i_code; // Type sub code
USHORT i_cksum;
USHORT i_id;
USHORT i_seq;
// This is not the standard header, but we reserve space for time
ULONG timestamp;
} IcmpHeader;
//
// IP option header--use with socket option IP_OPTIONS
//
typedef struct _ipoptionhdr
{
unsigned char code; // Option type
unsigned char len; // Length of option hdr
unsigned char ptr; // Offset into options
unsigned long addr[9]; // List of IP addrs
} IpOptionHeader;
#define DEF_PACKET_SIZE 32 // Default packet size
#define MAX_PACKET 1024 // Max ICMP packet size
#define MAX_IP_HDR_SIZE 60 // Max IP header size w/options
BOOL bRecordRoute;
int datasize;
char *lpdest;
void FillICMPData(char *icmp_data, int datasize)
{
IcmpHeader *icmp_hdr = NULL;
char *datapart = NULL;
icmp_hdr = (IcmpHeader*)icmp_data;
icmp_hdr->i_type = ICMP_ECHO; // Request an ICMP echo
icmp_hdr->i_code = 0;
icmp_hdr->i_id = (USHORT)GetCurrentProcessId();
icmp_hdr->i_cksum = 0;
icmp_hdr->i_seq = 0;
datapart = icmp_data + sizeof(IcmpHeader);
//
// Place some junk in the buffer
//
memset(datapart,'I', datasize - sizeof(IcmpHeader));
}
USHORT checksum(USHORT *buffer, int size)
{
unsigned long cksum=0;
while (size > 1)
{
cksum += *buffer++;
size -= sizeof(USHORT);
}
if (size)
{
cksum += *(UCHAR*)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (USHORT)(~cksum);
}
int main()
{
WSADATA wsaData;
SOCKET sockRaw = INVALID_SOCKET;
struct sockaddr_in dest,from;
int bread,
fromlen = sizeof(from),
timeout = 1000,
ret;
char *icmp_data = "AAAA",
*recvbuf = NULL;
unsigned int addr = 0;
USHORT seq_no = 0;
struct hostent *hp = NULL;
IpOptionHeader ipopt;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
{
printf("WSAStartup() failed: %d\n", GetLastError());
return -1;
}
sockRaw = WSASocket (AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0,WSA_FLAG_OVERLAPPED);
if (sockRaw == INVALID_SOCKET)
{
printf("WSASocket() failed: %d\n", WSAGetLastError());
return -1;
}
if (bRecordRoute)
{
// Setup the IP option header to go out on every ICMP packet
//
ZeroMemory(&ipopt, sizeof(ipopt));
ipopt.code = IP_RECORD_ROUTE; // Record route option
ipopt.ptr = 4; // Point to the first addr offset
ipopt.len = 39; // Length of option header
ret = setsockopt(sockRaw, IPPROTO_IP, IP_OPTIONS, (char *)&ipopt, sizeof(ipopt));
if (ret == SOCKET_ERROR)
{
printf("setsockopt(IP_OPTIONS) failed: %d\n", WSAGetLastError());
}
}
// Set the send/recv timeout values
//
bread = setsockopt(sockRaw, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout));
if(bread == SOCKET_ERROR)
{
printf("setsockopt(SO_RCVTIMEO) failed: %d\n", WSAGetLastError());
return -1;
}
timeout = 1000;
bread = setsockopt(sockRaw, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));
if (bread == SOCKET_ERROR)
{
printf("setsockopt(SO_SNDTIMEO) failed: %d\n", WSAGetLastError());
return -1;
}
memset(&dest, 0, sizeof(dest));
//
// Resolve the endpoint's name if necessary
//
char *lpdest = "192.168.157.128";
dest.sin_family = AF_INET;
if ((dest.sin_addr.s_addr = inet_addr(lpdest)) == INADDR_NONE)
{
if ((hp = gethostbyname(lpdest)) != NULL)
{
memcpy(&(dest.sin_addr), hp->h_addr, hp->h_length);
dest.sin_family = hp->h_addrtype;
printf("dest.sin_addr = %s\n", inet_ntoa(dest.sin_addr));
}
else
{
printf("gethostbyname() failed: %d\n",
WSAGetLastError());
return -1;
}
}
//
// Create the ICMP packet
//
datasize += sizeof(IcmpHeader);
icmp_data = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,MAX_PACKET);
if (!icmp_data)
{
printf("HeapAlloc() failed: %d\n", GetLastError());
return -1;
}
memset(icmp_data,0,MAX_PACKET);
FillICMPData(icmp_data,datasize);
//
// Start sending/receiving ICMP packets
//
while(1)
{
static int nCount = 0;
int bwrote;
if (nCount++ == 1)
break;
((IcmpHeader*)icmp_data)->i_cksum = 0;
((IcmpHeader*)icmp_data)->timestamp = GetTickCount();
((IcmpHeader*)icmp_data)->i_seq = seq_no++;
((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data, datasize);
bwrote = sendto(sockRaw, icmp_data, datasize, 0, (struct sockaddr*)&dest, sizeof(dest));
if (bwrote == SOCKET_ERROR)
{
if (WSAGetLastError() == WSAETIMEDOUT)
{
printf("timed out\n");
continue;
}
printf("sendto() failed: %d\n", WSAGetLastError());
return -1;
}
if (bwrote < datasize)
{
printf("Wrote %d bytes\n", bwrote);
}
Sleep(1000);
}
// Cleanup
//
if (sockRaw != INVALID_SOCKET)
closesocket(sockRaw);
HeapFree(GetProcessHeap(), 0, recvbuf);
HeapFree(GetProcessHeap(), 0, icmp_data);
WSACleanup();
return 0;
}If you see the sniffed traffic (a screen shot i have attached)you can see that the program is also sending some trailer (some 00 s)with the ICMP packet.
Can anyone please tell me what changes i should made to the code to remove the trailer part of the packet??And send my desired data(payload) with the ICMP packet.
