一个VC写的完整、简单的Sniffer代码

王朝vc·作者佚名  2006-01-09
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来源：https://www.xfocus.net/bbs/index.php?act=ST&f=3&t=50463

以下完整、简单的Sniffer代码代码是用SOCK_RAW写的.SP2已经不支持RAW

#include <winsock2.h>

#include <windows.h>

#include <ws2tcpip.h>

#include <stdio.h>

#include <stdlib.h>

#define MAX_HOSTNAME_LAN 255

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)

#define MAX_ADDR_LEN 16

typedef struct tcpheader {

unsigned short int sport;

unsigned short int dport;

unsigned int th_seq;

unsigned int th_ack;

unsigned char th_x2:4;

unsigned char th_off:4;

unsigned char Flags;

unsigned short int th_win;

unsigned short int th_sum;

unsigned short int th_urp;

}TCP_HDR;

struct ipheader {

unsigned char ip_hl:4, ip_v:4; /* this means that each member is 4 bits */

unsigned char ip_tos;

unsigned short int ip_len;

unsigned short int ip_id;

unsigned short int ip_off;

unsigned char ip_ttl;

unsigned char ip_p;

unsigned short int ip_sum;

unsigned int ip_src;

unsigned int ip_dst;

}; /* total ip header length: 20 bytes (=160 bits) */

// Psuedo Header

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 tcpheader tcp;

}PS_HDR;

typedef struct udphdr {

unsigned short sport;

unsigned short dport;

unsigned short len;

unsigned short cksum;

}UDP_HDR;

void hexdump(char *pointer)

{

if ((*(pointer)>0))

printf("\\x%2.2i",*(pointer));

else

printf("\\x%2.2i",(*(pointer))*(-1)+82);

}

void main()

{

SOCKET sock;

WSADATA wsd;

char RecvBuf[65535] = {0};

DWORD dwBytesRet;

int pCount=0;

unsigned int optval = 1; //the pointer , which shows us the payload begin

unsigned char *datatcp=NULL; //the pointer , which shows us the payload begin

unsigned char *dataudp=NULL;

int lentcp=0, lenudp;

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

if((sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP))==SOCKET_ERROR)

{

exit(1);

}

char FAR name[MAX_HOSTNAME_LAN];

gethostname(name, MAX_HOSTNAME_LAN);

struct hostent FAR * pHostent;

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);

bind(sock, (SOCKADDR *)&sa, sizeof(sa));

//if you don't have raw socket support (win 95/98/me/win2kuser) it calls the exit(1) function

if ((WSAGetLastError())==10013)

exit(1);

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

struct udphdr *pUdpheader;

struct ipheader *pIpheader;

struct tcpheader *pTcpheader;

char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN];

SOCKADDR_IN saSource, saDest;

pIpheader = (struct ipheader *)RecvBuf;

pTcpheader = (struct tcpheader *)(RecvBuf+ sizeof(struct ipheader ));

pUdpheader = (struct udphdr *) (RecvBuf+ sizeof(struct ipheader ));

while (1)

{

memset(RecvBuf, 0, sizeof(RecvBuf));

recv(sock, RecvBuf, sizeof(RecvBuf), 0);

saSource.sin_addr.s_addr = pIpheader->ip_src;

strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);

//Check Dest IP

saDest.sin_addr.s_addr = pIpheader->ip_dst;

strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);

lentcp =(ntohs(pIpheader->ip_len)-(sizeof(struct ipheader)+sizeof(struct tcpheader)));

lenudp =(ntohs(pIpheader->ip_len)-(sizeof(struct ipheader)+sizeof(struct udphdr)));

if( (pIpheader->ip_p)==IPPROTO_TCP&&lentcp!=0)

{

printf("*******************************************\n");

pCount++;

datatcp=(unsigned char *) RecvBuf+sizeof(struct ipheader)+sizeof(struct tcpheader);

printf("-TCP-\n");

printf("\nDestination address->%s\n",szDestIP);

printf("\nDestination port->%i\n",ntohs(pTcpheader->dport));

printf("datatcp address->%x\n",datatcp);

printf("size of ipheader->%i\n",sizeof(struct ipheader));

printf("size of tcpheader->%i\n",sizeof(struct tcpheader));

printf("size of the hole packet->%i\n",ntohs(pIpheader->ip_len));

printf("\nchar Packet%i []=\"",pCount,lentcp);

for (int i=0;i<lentcp;i++)

{

printf("\\x%.2x",*(datatcp+i)); //hexdump(datatcp+i);

if(i%10==0)

{

printf("\"");

printf("\n\"");

}

}

printf("\";\n\n\n");

for (int i2=0;i2<lentcp;i2++)

{

if( *(datatcp+i2)<=127&&*(datatcp+i2)>=20)

printf("%c",*(datatcp+i2));

else

printf(".");

}

printf("\n\n");

printf("*******************************************\n");

}

if( (pIpheader->ip_p)==IPPROTO_UDP&&lentcp!=0)

{

pCount++;

dataudp=(unsigned char *) RecvBuf+sizeof(struct ipheader)+sizeof(struct udphdr);

printf("-UDP-\n");

printf("\nDestination address->%s\n",szDestIP);

printf("\nDestination port->%d\n",ntohs(pTcpheader->dport));

printf("dataudp address->%x\n",dataudp);

printf("size of ipheader->%i\n",sizeof(struct ipheader));

printf("size of udpheader->%i\n",sizeof(struct udphdr));

printf("size of the hole packet->%i\n",ntohs(pIpheader->ip_len));

printf("\nchar Packet%i []=\"",pCount,lenudp);

for (int x=0;x<lenudp;x++)

{

printf("\\x%.2x",*(dataudp+x));

if (x%10==0)

{

printf("\"");

printf("\n\"");

}

}

printf("\";\n\n\n");

for (int x2=0;x2<lenudp;x2++)

{

if( *(dataudp+x2)<=127&&*(dataudp+x2)>=20)

printf("%c",*(dataudp+x2));

else

printf(".");

}

printf("\n\n");

printf("*******************************************\n");

}

}

下载raw.zip

要用＂伪造数据包＂的方法，来禁止一切TCP连接，用Winpcap改写的代码为：

#include <winsock2.h>

#include <windows.h>

#include <ws2tcpip.h>

#include <stdio.h>

#include <stdlib.h>

#pragma comment(lib,"ws2_32.lib")

#define MAX_HOSTNAME_LAN 255

#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1)

#define MAX_ADDR_LEN 16

struct ipheader {

unsigned char ip_hl:4, ip_v:4; /* this means that each member is 4 bits */

unsigned char ip_tos;

unsigned short int ip_len;

unsigned short int ip_id;

unsigned short int ip_off;

unsigned char ip_ttl;

unsigned char ip_p;

unsigned short int ip_sum;

unsigned int ip_src;

unsigned int ip_dst;

}; /* total ip header length: 20 bytes (=160 bits) */

typedef struct tcpheader {

unsigned short int sport;

unsigned short int dport;

unsigned int th_seq;

unsigned int th_ack;

unsigned char th_x:4;

unsigned char th_off:4;

unsigned char Flags;

unsigned short int th_win;

unsigned short int th_sum;

unsigned short int th_urp;

}TCP_HDR;

typedef struct udphdr {

unsigned short sport;

unsigned short dport;

unsigned short len;

unsigned short cksum;

}UDP_HDR;

void main()

{

SOCKET sock;

WSADATA wsd;

DWORD dwBytesRet;

unsigned int optval = 1;

unsigned char *dataudp,*datatcp;

int i,pCount=0,lentcp, lenudp;

SOCKADDR_IN sa,saSource, saDest;

struct hostent FAR * pHostent;

char FAR name[MAX_HOSTNAME_LAN];

char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN],RecvBuf[65535] = {0};

struct udphdr *pUdpheader;

struct ipheader *pIpheader;

struct tcpheader *pTcpheader;

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

if ((sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP))==SOCKET_ERROR)exit(1);

gethostname(name, MAX_HOSTNAME_LAN);

pHostent = gethostbyname(name);

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);

bind(sock, (SOCKADDR *)&sa, sizeof(sa));

if ((WSAGetLastError())==10013)exit(1);

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

pIpheader = (struct ipheader *)RecvBuf;

pTcpheader = (struct tcpheader *)(RecvBuf+ sizeof(struct ipheader ));

pUdpheader = (struct udphdr *) (RecvBuf+ sizeof(struct ipheader ));

while (1)

{

memset(RecvBuf, 0, sizeof(RecvBuf));

recv(sock, RecvBuf, sizeof(RecvBuf), 0);

saSource.sin_addr.s_addr = pIpheader->ip_src;

strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);

saDest.sin_addr.s_addr = pIpheader->ip_dst;

strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);

lentcp =(ntohs(pIpheader->ip_len)-(sizeof(struct ipheader)+sizeof(struct tcpheader)));

lenudp =(ntohs(pIpheader->ip_len)-(sizeof(struct ipheader)+sizeof(struct udphdr)));

if((pIpheader->ip_p)==IPPROTO_TCP&&lentcp!=0)

{

printf("*******************************************\n");

pCount++;

datatcp=(unsigned char *) RecvBuf+sizeof(struct ipheader)+sizeof(struct tcpheader);

printf("-TCP-\n");

printf("\nDestination address->%s\n",szDestIP);

printf("\nDestination port->%i\n",ntohs(pTcpheader->dport));

printf("datatcp address->%x\n",datatcp);

printf("size of ipheader->%i\n",sizeof(struct ipheader));

printf("size of tcpheader->%i\n",sizeof(struct tcpheader));

printf("size of the hole packet->%i\n",ntohs(pIpheader->ip_len));

printf("\nchar Packet%i [%i]=\"",pCount,lentcp-1);

for (i=0;i<lentcp;i++)

{

printf("\\x%.2x",*(datatcp+i));

if (i%10==0)printf("\"\n\"");

}

printf("\";\n\n\n");

for (i=0;i<lentcp;i++)

{

if( *(datatcp+i)<=127&&*(datatcp+i)>=20)printf("%c",*(datatcp+i));

else printf(".");

}

printf("\n\n*******************************************\n");

}

if((pIpheader->ip_p)==IPPROTO_UDP&&lentcp!=0)

{

pCount++;

dataudp=(unsigned char *) RecvBuf+sizeof(struct ipheader)+sizeof(struct udphdr);

printf("-UDP-\n");

printf("\nDestination address->%s\n",szDestIP);

printf("\nDestination port->%d\n",ntohs(pTcpheader->dport));

printf("dataudp address->%x\n",dataudp);

printf("size of ipheader->%i\n",sizeof(struct ipheader));

printf("size of udpheader->%i\n",sizeof(struct udphdr));

printf("size of the hole packet->%i\n",ntohs(pIpheader->ip_len));

printf("\nchar Packet%i [%i]=\"",pCount,lenudp-1);

for (i=0;i<lenudp;i++)

{

printf("\\x%.2x",*(dataudp+i));

if (i%10==0)printf("\"\n\"");

}

printf("\";\n\n\n");

for (i=0;i<lenudp;i++)

{

if( *(dataudp+i)<=127&&*(dataudp+i)>=20)printf("%c",*(dataudp+i));

else printf(".");

}

printf("\n\n*******************************************\n");

}

}

}

 
 
 
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