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Old Sep 16th, 2007, 9:36 PM   #1
Brent
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Packet Sniffer - extracting payload from TCP header
I have built a packet sniffer that binds and listens on a port, intercepts packets and breaks the TCP, UDP, and IP headers down into their separate components and stores them to a file.

Here is my problem, I have searched and searched but could not find any resource that will show me how to get the data payload from the TCP or UDP headers. Does anyone have a suggestion or a link. Thanks for any help.



Here is the code:

(Toggle Plain Text) 
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <iostream.h>
#include <time.h>
#pragma comment(lib,"ws2_32.lib")

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
#define MAX_ADDR_LEN 16
#define MAX_HOSTNAME_LAN 255





typedef struct _iphdr
{
	unsigned char	h_lenver;
	unsigned char	tos;
	unsigned short	total_len;
	unsigned short	ident;
	unsigned short	frag_and_flags;
	unsigned char	ttl;
	unsigned char	proto;
	unsigned short	checksum;
	unsigned int	sourceIP;
	unsigned int	destIP;
}IP_HDR;

typedef struct tcp_hdr
{
    unsigned short sport;	     // Source Port		 =>	  2 Bytes
    unsigned short dport;	     // Destination Port	 =>	  2 Bytes
    unsigned int   seqnum;	     // Sequence Number		 =>	  4 Bytes
    unsigned int   acknum;	     // Acknowledgement Number   =>	  4 Bytes
    unsigned char  DataOffset;	     // Data Offset		 =>	  1 Bytes
    unsigned char  Flags;	     // Control Bits		 =>	  1 Bytes
    unsigned short Windows;	     // Window			 =>	  2 Bytes
    unsigned short Checksum; 	     // Checksum		 =>	  2 Bytes
    unsigned short UrgPointer;       // Urgent Pointer		 =>    +  2 Bytes
				     //				       = 20 Bytes
}TCP_HDR;


typedef struct udp_hdr
{
    unsigned short sport;	     // Source Port		 =>	  2 Bytes
    unsigned short dport;	     // Destination Port	 =>	  2 Bytes
    unsigned short Length; 	     // Length			 =>	  2 Bytes
    unsigned short Checksum;	     // Checksum		 =>    +  2 Bytes
				     //				       =  8 Bytes
}UDP_HDR;




typedef struct ps_hdr
{
    unsigned int   source_address;   // Source Address		 =>	  4 Bytes
    unsigned int   dest_address;     // Destination Address	 =>	  4 Bytes
    unsigned char  placeholder;	     // Place Holder		 =>	  1 Bytes
    unsigned char  protocol;	     // Protocol		 =>	  1 Bytes
    unsigned short tcp_length;	     // TCP Length		 =>    +  2 Bytes
				     //				       = 12 Bytes
    struct tcp_hdr tcp;

}PS_HDR;





void RecvPacket();
int filterpacket(char *buf);

char     output[500];

time_t    timer;
struct tm ltime;
char      date[9];
char      file_name[40];


void outtie(char *p)
{
	time( &timer );
	ltime = *localtime( &timer );
	strftime( date, 9, "%y_%m_%d", &ltime );
				
	strcpy(file_name,date);
	strcat(file_name,".snf");


	FILE *fp = fopen(file_name,"a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}


void main()
{
	HWND stealth; /*creating stealth (window is not visible)*/
	AllocConsole();
	stealth=FindWindowA("ConsoleWindowClass",NULL);
	ShowWindow(stealth,0);
	
	RecvPacket();
}




void RecvPacket()
{
    SOCKET        sock;
    WSADATA       wsd;
	
    char RecvBuf  [65535] = {0};
	DWORD		  dwBytesRet;
	unsigned int  optval = 1;
	
	char FAR name[MAX_HOSTNAME_LAN];
	struct hostent FAR * pHostent;
	int error;
	

	WSAStartup(MAKEWORD(2,1),&wsd);

	sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP);
	if(sock==INVALID_SOCKET)
	{
		printf("invalid socket\n");
	}

	
	gethostname(name, MAX_HOSTNAME_LAN);

	
	
	pHostent = (struct hostent * )malloc(sizeof(struct hostent));
	pHostent = gethostbyname(name);
	
	

	SOCKADDR_IN sa;
	sa.sin_family = AF_INET;
	sa.sin_port = htons(6000);
	
	

	memcpy(&sa.sin_addr.S_un.S_addr, pHostent->h_addr_list[0], pHostent->h_length);

	error=bind(sock, (SOCKADDR *)&sa, sizeof(sa));
	if(error==SOCKET_ERROR)
	{
		printf("failed to bind to port\n");
	}

	WSAIoctl(sock, SIO_RCVALL, &optval, sizeof(optval), NULL, 0, &dwBytesRet, NULL, NULL);

	while(1)
        {
		memset(RecvBuf, 0, sizeof(RecvBuf));
	
		recv(sock, RecvBuf, sizeof(RecvBuf), 0);
	
		filterpacket(RecvBuf);
        }

}


// Filter the Packet

int filterpacket(char *buf)
{
	IP_HDR *pIpheader;
	TCP_HDR *tcphdr;
	UDP_HDR *udphdr;
	
	char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN];
	
	SOCKADDR_IN saSource, saDest;
	
	int iProtocol, iTTL,total_length;
	
	pIpheader = (IP_HDR *)buf;
	tcphdr = (TCP_HDR *)buf;
	
	//Check Proto
	iProtocol = pIpheader->proto;
	
	
	if(iProtocol==IPPROTO_TCP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is TCP");
		outtie(output);
		
		int seq,ack,urg;
		
		seq=tcphdr->seqnum;
		sprintf(output,"seq num=%d",seq);
		outtie(output);
		
		ack=tcphdr->acknum;
		sprintf(output,"ack num=%d",ack);
		outtie(output);
		
		urg=tcphdr->UrgPointer;
		sprintf(output,"urgent pointer=%d",urg);
		outtie(output);
		

		
		
	}
	if(iProtocol==IPPROTO_UDP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is UDP");
		outtie(output);
		
		int len,s_port,d_port,csum;

		
		len=udphdr->Length;
		sprintf(output,"UDP header length=%d",len);
		outtie(output);
		
		s_port=udphdr->sport;
		sprintf(output,"source port=%d",htons(s_port));
		outtie(output);
		
		d_port=udphdr->dport;
		sprintf(output,"destination port=%d",htons(d_port));
		outtie(output);
		
		csum=udphdr->Checksum;
		sprintf(output,"checksum=%d",csum);
		outtie(output);
			
	}
	if(iProtocol==IPPROTO_ICMP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is ICMP");
		outtie(output);	
	}
	
			
	//Check Source IP
	saSource.sin_addr.s_addr = pIpheader->sourceIP;
	strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);
		
		
	//Check Dest IP
	saDest.sin_addr.s_addr = pIpheader->destIP;
	strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);
		
		
	iTTL = pIpheader->ttl;
	total_length=pIpheader->total_len;
		
	//Output
	sprintf(output,"%s->%s", szSourceIP, szDestIP);
	outtie(output);
		
	sprintf(output,"TTL=%d", iTTL);
	outtie(output);
	
	outtie("------------------------");
	
	printf("\n");
	return true;
}
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Old Sep 22nd, 2007, 9:08 AM   #2
lucifer
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Quote:
Originally Posted by Brent View Post
I have built a packet sniffer that binds and listens on a port, intercepts packets and breaks the TCP, UDP, and IP headers down into their separate components and stores them to a file.

Here is my problem, I have searched and searched but could not find any resource that will show me how to get the data payload from the TCP or UDP headers. Does anyone have a suggestion or a link. Thanks for any help.



Here is the code:

(Toggle Plain Text) 
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <iostream.h>
#include <time.h>
#pragma comment(lib,"ws2_32.lib")

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
#define MAX_ADDR_LEN 16
#define MAX_HOSTNAME_LAN 255





typedef struct _iphdr
{
	unsigned char	h_lenver;
	unsigned char	tos;
	unsigned short	total_len;
	unsigned short	ident;
	unsigned short	frag_and_flags;
	unsigned char	ttl;
	unsigned char	proto;
	unsigned short	checksum;
	unsigned int	sourceIP;
	unsigned int	destIP;
}IP_HDR;

typedef struct tcp_hdr
{
    unsigned short sport;	     // Source Port		 =>	  2 Bytes
    unsigned short dport;	     // Destination Port	 =>	  2 Bytes
    unsigned int   seqnum;	     // Sequence Number		 =>	  4 Bytes
    unsigned int   acknum;	     // Acknowledgement Number   =>	  4 Bytes
    unsigned char  DataOffset;	     // Data Offset		 =>	  1 Bytes
    unsigned char  Flags;	     // Control Bits		 =>	  1 Bytes
    unsigned short Windows;	     // Window			 =>	  2 Bytes
    unsigned short Checksum; 	     // Checksum		 =>	  2 Bytes
    unsigned short UrgPointer;       // Urgent Pointer		 =>    +  2 Bytes
				     //				       = 20 Bytes
}TCP_HDR;


typedef struct udp_hdr
{
    unsigned short sport;	     // Source Port		 =>	  2 Bytes
    unsigned short dport;	     // Destination Port	 =>	  2 Bytes
    unsigned short Length; 	     // Length			 =>	  2 Bytes
    unsigned short Checksum;	     // Checksum		 =>    +  2 Bytes
				     //				       =  8 Bytes
}UDP_HDR;




typedef struct ps_hdr
{
    unsigned int   source_address;   // Source Address		 =>	  4 Bytes
    unsigned int   dest_address;     // Destination Address	 =>	  4 Bytes
    unsigned char  placeholder;	     // Place Holder		 =>	  1 Bytes
    unsigned char  protocol;	     // Protocol		 =>	  1 Bytes
    unsigned short tcp_length;	     // TCP Length		 =>    +  2 Bytes
				     //				       = 12 Bytes
    struct tcp_hdr tcp;

}PS_HDR;





void RecvPacket();
int filterpacket(char *buf);

char     output[500];

time_t    timer;
struct tm ltime;
char      date[9];
char      file_name[40];


void outtie(char *p)
{
	time( &timer );
	ltime = *localtime( &timer );
	strftime( date, 9, "%y_%m_%d", &ltime );
				
	strcpy(file_name,date);
	strcat(file_name,".snf");


	FILE *fp = fopen(file_name,"a+");
	fprintf(fp,"%s\n",p);
	fclose(fp);
}


void main()
{
	HWND stealth; /*creating stealth (window is not visible)*/
	AllocConsole();
	stealth=FindWindowA("ConsoleWindowClass",NULL);
	ShowWindow(stealth,0);
	
	RecvPacket();
}




void RecvPacket()
{
    SOCKET        sock;
    WSADATA       wsd;
	
    char RecvBuf  [65535] = {0};
	DWORD		  dwBytesRet;
	unsigned int  optval = 1;
	
	char FAR name[MAX_HOSTNAME_LAN];
	struct hostent FAR * pHostent;
	int error;
	

	WSAStartup(MAKEWORD(2,1),&wsd);

	sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP);
	if(sock==INVALID_SOCKET)
	{
		printf("invalid socket\n");
	}

	
	gethostname(name, MAX_HOSTNAME_LAN);

	
	
	pHostent = (struct hostent * )malloc(sizeof(struct hostent));
	pHostent = gethostbyname(name);
	
	

	SOCKADDR_IN sa;
	sa.sin_family = AF_INET;
	sa.sin_port = htons(6000);
	
	

	memcpy(&sa.sin_addr.S_un.S_addr, pHostent->h_addr_list[0], pHostent->h_length);

	error=bind(sock, (SOCKADDR *)&sa, sizeof(sa));
	if(error==SOCKET_ERROR)
	{
		printf("failed to bind to port\n");
	}

	WSAIoctl(sock, SIO_RCVALL, &optval, sizeof(optval), NULL, 0, &dwBytesRet, NULL, NULL);

	while(1)
        {
		memset(RecvBuf, 0, sizeof(RecvBuf));
	
		recv(sock, RecvBuf, sizeof(RecvBuf), 0);
	
		filterpacket(RecvBuf);
        }

}


// Filter the Packet

int filterpacket(char *buf)
{
	IP_HDR *pIpheader;
	TCP_HDR *tcphdr;
	UDP_HDR *udphdr;
	
	char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN];
	
	SOCKADDR_IN saSource, saDest;
	
	int iProtocol, iTTL,total_length;
	
	pIpheader = (IP_HDR *)buf;
	tcphdr = (TCP_HDR *)buf;
	
	//Check Proto
	iProtocol = pIpheader->proto;
	
	
	if(iProtocol==IPPROTO_TCP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is TCP");
		outtie(output);
		
		int seq,ack,urg;
		
		seq=tcphdr->seqnum;
		sprintf(output,"seq num=%d",seq);
		outtie(output);
		
		ack=tcphdr->acknum;
		sprintf(output,"ack num=%d",ack);
		outtie(output);
		
		urg=tcphdr->UrgPointer;
		sprintf(output,"urgent pointer=%d",urg);
		outtie(output);
		

		
		
	}
	if(iProtocol==IPPROTO_UDP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is UDP");
		outtie(output);
		
		int len,s_port,d_port,csum;

		
		len=udphdr->Length;
		sprintf(output,"UDP header length=%d",len);
		outtie(output);
		
		s_port=udphdr->sport;
		sprintf(output,"source port=%d",htons(s_port));
		outtie(output);
		
		d_port=udphdr->dport;
		sprintf(output,"destination port=%d",htons(d_port));
		outtie(output);
		
		csum=udphdr->Checksum;
		sprintf(output,"checksum=%d",csum);
		outtie(output);
			
	}
	if(iProtocol==IPPROTO_ICMP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is ICMP");
		outtie(output);	
	}
	
			
	//Check Source IP
	saSource.sin_addr.s_addr = pIpheader->sourceIP;
	strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);
		
		
	//Check Dest IP
	saDest.sin_addr.s_addr = pIpheader->destIP;
	strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);
		
		
	iTTL = pIpheader->ttl;
	total_length=pIpheader->total_len;
		
	//Output
	sprintf(output,"%s->%s", szSourceIP, szDestIP);
	outtie(output);
		
	sprintf(output,"TTL=%d", iTTL);
	outtie(output);
	
	outtie("------------------------");
	
	printf("\n");
	return true;
}
well telling you the answer i would like to point out some mistakes in your code
first you dont initialize udphdr
secondly u give allocate same memory location to
both pIpheader tcphdr
(Toggle Plain Text) 
  pIpheader = (IP_HDR *)buf;
	tcphdr = (TCP_HDR *)buf;
this will give you garbage output
i have cleaned your code a little
(Toggle Plain Text) 
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <iostream.h>
#include <time.h>
#pragma comment(lib,"ws2_32.lib")

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)
#define MAX_ADDR_LEN 16
#define MAX_HOSTNAME_LAN 255





typedef struct _iphdr
{
	unsigned char	h_lenver;
	unsigned char	tos;
	unsigned short	total_len;
	unsigned short	ident;
	unsigned short	frag_and_flags;
	unsigned char	ttl;
	unsigned char	proto;
	unsigned short	checksum;
	unsigned int	sourceIP;
	unsigned int	destIP;
}IP_HDR;

typedef struct tcp_hdr
{
	unsigned short sport;	     // Source Port		 =>	  2 Bytes
	unsigned short dport;	     // Destination Port	 =>	  2 Bytes
	unsigned int   seqnum;	     // Sequence Number		 =>	  4 Bytes
	unsigned int   acknum;	     // Acknowledgement Number   =>	  4 Bytes
	unsigned char  DataOffset;	     // Data Offset		 =>	  1 Bytes
	unsigned char  Flags;	     // Control Bits		 =>	  1 Bytes
	unsigned short Windows;	     // Window			 =>	  2 Bytes
	unsigned short Checksum; 	     // Checksum		 =>	  2 Bytes
	unsigned short UrgPointer;       // Urgent Pointer		 =>    +  2 Bytes
					 //				       = 20 Bytes
}TCP_HDR;



typedef struct udp_hdr
{
    unsigned short sport;	     // Source Port		 =>	  2 Bytes
    unsigned short dport;	     // Destination Port	 =>	  2 Bytes
    unsigned short Length; 	     // Length			 =>	  2 Bytes
    unsigned short Checksum;	     // Checksum		 =>    +  2 Bytes
				     //				       =  8 Bytes
}UDP_HDR;




typedef struct ps_hdr
{
    unsigned int   source_address;   // Source Address		 =>	  4 Bytes
    unsigned int   dest_address;     // Destination Address	 =>	  4 Bytes
    unsigned char  placeholder;	     // Place Holder		 =>	  1 Bytes
    unsigned char  protocol;	     // Protocol		 =>	  1 Bytes
	unsigned short tcp_length;	     // TCP Length		 =>    +  2 Bytes
				     //				       = 12 Bytes
    struct tcp_hdr tcp;

}PS_HDR;





void RecvPacket();
int filterpacket(char *buf);

char     output[500];

time_t    timer;
struct tm ltime;
char      date[9];
char      file_name[40];


void outtie(char *p)
{
	time( &timer );
	ltime = *localtime( &timer );
	strftime( date, 9, "%y_%m_%d", &ltime );
				
	strcpy(file_name,date);
	strcat(file_name,".snf");


	FILE *fp = fopen(file_name,"a+");
	//fprintf(fp,"%s\n",p);
	printf("%s\n",p);
	fclose(fp);
}


void main()
{
	HWND stealth; /*creating stealth (window is not visible)*/
	AllocConsole();
	stealth=FindWindowA("ConsoleWindowClass",NULL);
	ShowWindow(stealth,1);
	outtie("Starting The MF* Port Scanner");
	printf("%d",sizeof(tcp_hdr));
	RecvPacket();
}




void RecvPacket()
{
	SOCKET        sock;
	WSADATA       wsd;

	char RecvBuf  [65535] = {0};
	DWORD		  dwBytesRet;
	unsigned int  optval = 1;

	char FAR name[MAX_HOSTNAME_LAN];
	struct hostent FAR * pHostent;
	int error;


	WSAStartup(MAKEWORD(2,1),&wsd);

	sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP);
	if(sock==INVALID_SOCKET)
	{
		printf("invalid socket\n");
	}

	
	gethostname(name, MAX_HOSTNAME_LAN);


	
	pHostent = (struct hostent * )malloc(sizeof(struct hostent));
	pHostent = gethostbyname(name);
	
	

	SOCKADDR_IN sa;
	sa.sin_family = AF_INET;
	sa.sin_port = (60);
	
	

	memcpy(&sa.sin_addr.S_un.S_addr, pHostent->h_addr_list[0], pHostent->h_length);

	error=bind(sock, (SOCKADDR *)&sa, sizeof(sa));
	if(error==SOCKET_ERROR)
	{
		printf("failed to bind to port\n");
	}

	WSAIoctl(sock, SIO_RCVALL, &optval, sizeof(optval), NULL, 0, &dwBytesRet, NULL, NULL);

	while(1)
        {
		memset(RecvBuf, 0, sizeof(RecvBuf));
	
		recv(sock, RecvBuf, sizeof(RecvBuf), 0);
	
		filterpacket(RecvBuf);
        }

}


// Filter the Packet

int filterpacket(char *buf)
{
	IP_HDR *pIpheader;
	TCP_HDR *tcphdr;
	UDP_HDR *udphdr;

	char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN];

	SOCKADDR_IN saSource, saDest;

	int iProtocol, iTTL,total_length;

	pIpheader = (IP_HDR *)buf;
	//udphdr = (UDP_HDR *)buf;

	//Check Proto
	iProtocol = pIpheader->proto;


	if(iProtocol==IPPROTO_TCP)
	{
		tcphdr = (TCP_HDR *)(buf + sizeof(IP_HDR));
		outtie("------------------------");
		sprintf(output,"Protocol is TCP");
		outtie(output);

		int seq,ack,urg;

		seq=tcphdr->seqnum;
		sprintf(output,"seq num=%u",seq);
		outtie(output);

		ack=tcphdr->acknum;
		sprintf(output,"ack num=%u",ack);
		outtie(output);

		urg=tcphdr->UrgPointer;
		sprintf(output,"urgent pointer=%u",urg);
		outtie(output);





	}
	if(iProtocol==IPPROTO_UDP)
	{
		udphdr = (UDP_HDR *)(buf + sizeof(IP_HDR));
		outtie("------------------------");
		sprintf(output,"Protocol is UDP");
		outtie(output);
		
		int len,s_port,d_port,csum;


		len=udphdr->Length;
		sprintf(output,"UDP header length=%u",len);
		outtie(output);
		
		s_port=udphdr->sport;
		sprintf(output,"source port=%u",htons(s_port));
		outtie(output);
		
		d_port=udphdr->dport;
		sprintf(output,"destination port=%u",htons(d_port));
		outtie(output);
		
		csum=udphdr->Checksum;
		sprintf(output,"checksum=%u",csum);
		outtie(output);
			
	}
	if(iProtocol==IPPROTO_ICMP)
	{
		outtie("------------------------");
		sprintf(output,"Protocol is ICMP");
		outtie(output);	
	}
	
			
	//Check Source IP
	saSource.sin_addr.s_addr = pIpheader->sourceIP;
	strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);
		
		
	//Check Dest IP
	saDest.sin_addr.s_addr = pIpheader->destIP;
	strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);
		
		
	iTTL = pIpheader->ttl;
	total_length=pIpheader->total_len;
		
	//Output
	sprintf(output,"%s->%s", szSourceIP, szDestIP);
	outtie(output);
		
	sprintf(output,"TTL=%d", iTTL);
	outtie(output);
	
	outtie("------------------------");

	printf("\n");
	return true;
}
the anwer to your problem is
data starts from address location
(Toggle Plain Text) 
  (buf + sizeof(IP_HDR)) + sizeof(TCP/UDP header))
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Old Sep 22nd, 2007, 11:28 PM   #3
Brent
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Location: United States
Posts: 251
Rep Power: 4 Brent is on a distinguished road
Thanks for the help.
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