网络上的数据报侦听

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <Winsock2.h>
#include <mstcpip.h>

#define STATUS_FAILED 0xFFFF //定义异常出错代码
#define MAX_PACK_LEN 65535 //接收的最大IP报文
#define MAX_ADDR_LEN 16 //点分十进制地址的最大长度
#define MAX_PROTO_TEXT_LEN 16 //子协议名称(如"TCP")最大长度
#define MAX_PROTO_NUM 12 //子协议数量
#define MAX_HOSTNAME_LAN 255 //最大主机名长度
#define CMD_PARAM_HELP true

typedef struct _iphdr
{
unsigned char h_lenver; //4位首部长度+4位IP版本号
unsigned char tos; //8位服务类型TOS
unsigned short total_len; //16位总长度（字节）
unsigned short ident; //16位标识
unsigned short frag_and_flags; //3位标志位
unsigned char ttl; //8位生存时间 TTL
unsigned char proto; //8位协议 (TCP, UDP 或其他)
unsigned short checksum; //16位IP首部校验和
unsigned int sourceIP; //32位源IP地址
unsigned int destIP; //32位目的IP地址
}IP_HEADER;

typedef struct _tcphdr //定义TCP首部
{
USHORT th_sport; //16位源端口
USHORT th_dport; //16位目的端口
unsigned int th_seq; //32位序列号
unsigned int th_ack; //32位确认号
unsigned char th_lenres; //4位首部长度/6位保留字
unsigned char th_flag; //6位标志位
USHORT th_win; //16位窗口大小
USHORT th_sum; //16位校验和
USHORT th_urp; //16位紧急数据偏移量
}TCP_HEADER;

typedef struct _udphdr //定义UDP首部
{
unsigned short uh_sport; //16位源端口
unsigned short uh_dport; //16位目的端口
unsigned short uh_len; //16位长度
unsigned short uh_sum; //16位校验和
} UDP_HEADER;

typedef struct _icmphdr //定义ICMP首部
{
BYTE i_type; //8位类型
BYTE i_code; //8位代码
USHORT i_cksum; //16位校验和
USHORT i_id; //识别号（一般用进程号作为识别号）
USHORT i_seq; //报文序列号
ULONG timestamp; //时间戳
}ICMP_HEADER;

typedef struct _protomap //定义子协议映射表
{
int ProtoNum;
char ProtoText[MAX_PROTO_TEXT_LEN];
}PROTOMAP;

PROTOMAP ProtoMap[MAX_PROTO_NUM]={ //为子协议映射表赋值
{ IPPROTO_IP , "IP " },
{ IPPROTO_ICMP , "ICMP" },
{ IPPROTO_IGMP , "IGMP" },
{ IPPROTO_GGP , "GGP " },
{ IPPROTO_TCP , "TCP " },
{ IPPROTO_PUP , "PUP " },
{ IPPROTO_UDP , "UDP " },
{ IPPROTO_IDP , "IDP " },
{ IPPROTO_ND , "NP " },
{ IPPROTO_RAW , "RAW " },
{ IPPROTO_MAX , "MAX " },
{ NULL , "" } };

SOCKET SockRaw;
char TcpFlag[6]={'F','S','R','P','A','U'}; //定义TCP标志位
bool ParamTcp =false; // -t关注TCP 报文
bool ParamUdp =false; // -u关注UDP 报文
bool ParamIcmp =false; // -i关注ICMP报文
bool ParamDecode=false; // -d对协议进行解码
char *strFromIpFilter=NULL; // 源IP地址过滤
char *strDestIpFilter=NULL; // 目的地址过滤
char *strSensitive=NULL; // 敏感字符串
int iPortFilter=0; // 端口过滤
int iProtocol, iTTL;
char szProtocol[MAX_PROTO_TEXT_LEN];
char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN];

int DecodeIpPack(char *, int); //IP解包函数
int DecodeTcpPack(char *, int); //TCP解包函数
int DecodeUdpPack(char *, int); //UDP解包函数
int DecodeIcmpPack(char *, int); //ICMP解包函数
void CheckSockError(int, char*); //出错处理函数
char * CheckProtocol(int); //协议检查
void usage(void); //使用说明
bool GetCmdLine(int, char **); //命令行参数处理



void main(int argc, char ** argv)
{
int iErrorCode;
char RecvBuf[MAX_PACK_LEN] = {0};
usage();
if(GetCmdLine(argc, argv)==CMD_PARAM_HELP) exit(0);
//初始化SOCKET
WSADATA wsaData;
iErrorCode = WSAStartup(MAKEWORD(2,1),&wsaData);
CheckSockError(iErrorCode, "WSAStartup");
SockRaw = socket(AF_INET , SOCK_RAW , IPPROTO_IP);
CheckSockError(SockRaw, "socket");
//获取本机IP地址
char FAR name[MAX_HOSTNAME_LAN];
iErrorCode = gethostname(name, MAX_HOSTNAME_LAN);
CheckSockError(iErrorCode, "gethostname");
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);
free(pHostent);
iErrorCode = bind(SockRaw, (PSOCKADDR)&sa, sizeof(sa));
CheckSockError(iErrorCode, "bind");
//设置SOCK_RAW为SIO_RCVALL，以便接收所有的IP包
DWORD dwBufferLen[10] ;
DWORD dwBufferInLen = 1 ;
DWORD dwBytesReturned = 0 ;
iErrorCode=WSAIoctl(SockRaw, SIO_RCVALL,&dwBufferInLen, sizeof(dwBufferInLen),
&dwBufferLen, sizeof(dwBufferLen),&dwBytesReturned , NULL , NULL );
CheckSockError(iErrorCode, "Ioctl");
//侦听IP报文
while(1)
{
memset(RecvBuf, 0, sizeof(RecvBuf));
iErrorCode = recv(SockRaw, RecvBuf, sizeof(RecvBuf), 0);
CheckSockError(iErrorCode, "recv");
iErrorCode = DecodeIpPack(RecvBuf, iErrorCode);
CheckSockError(iErrorCode, "Decode");
}
}

//IP解包程序
int DecodeIpPack(char *buf, int iBufSize)
{
IP_HEADER *pIpheader;
SOCKADDR_IN saSource, saDest;
pIpheader = (IP_HEADER *)buf;
//协议甄别
iProtocol = pIpheader->proto;
strncpy(szProtocol, CheckProtocol(iProtocol), MAX_PROTO_TEXT_LEN);
if((iProtocol==IPPROTO_TCP) && (!ParamTcp)) return true;
if((iProtocol==IPPROTO_UDP) && (!ParamUdp)) return true;
if((iProtocol==IPPROTO_ICMP) && (!ParamIcmp)) return true;
//源地址
saSource.sin_addr.s_addr = pIpheader->sourceIP;
strncpy(szSourceIP, inet_ntoa(saSource.sin_addr), MAX_ADDR_LEN);
if (strFromIpFilter)
if (strcmp(strFromIpFilter,szSourceIP)) return true;
//目的地址
saDest.sin_addr.s_addr = pIpheader->destIP;
strncpy(szDestIP, inet_ntoa(saDest.sin_addr), MAX_ADDR_LEN);
if (strDestIpFilter)
if (strcmp(strDestIpFilter,szDestIP)) return true;
iTTL = pIpheader->ttl;
//计算IP首部的长度
int iIphLen = sizeof(unsigned long) * (pIpheader->h_lenver & 0xf);
//根据协议类型分别调用相应的函数
switch(iProtocol)
{
case IPPROTO_TCP :DecodeTcpPack(buf+iIphLen, iBufSize);break;
case IPPROTO_UDP :DecodeUdpPack(buf+iIphLen, iBufSize);break;
case IPPROTO_ICMP :DecodeIcmpPack(buf+iIphLen, iBufSize);break;
default :break;
}
//printf("");
return true;
}

//协议识别程序
char * CheckProtocol(int iProtocol)
{
for(int i=0; i<MAX_PROTO_NUM; i++)
if(ProtoMap[i].ProtoNum==iProtocol)
return ProtoMap[i].ProtoText;
return "";
}

//TCP解包程序
int DecodeTcpPack(char * TcpBuf, int iBufSize)
{
TCP_HEADER * pTcpHeader;
int i;
int iSourcePort,iDestPort;

pTcpHeader = (TCP_HEADER * )TcpBuf;
//计算TCP首部长度
int TcpHeaderLen = pTcpHeader->th_lenres>>4;
TcpHeaderLen *= sizeof(unsigned long);
char * TcpData=TcpBuf+TcpHeaderLen;
//如果过滤敏感字符串则判断是否包含
if (strSensitive)
if ((strstr(TcpData, strSensitive))==NULL) return true;
//对端口进行过滤
iSourcePort = ntohs(pTcpHeader->th_sport);
iDestPort = ntohs(pTcpHeader->th_dport);
if ((iPortFilter) && (iSourcePort!=iPortFilter) && (iDestPort!=iPortFilter))
return true;
//输出
printf("%s ", szProtocol);
printf("%15s:%5d ->%15s:%5d ", szSourceIP, iSourcePort, szDestIP, iDestPort);
printf("TTL=%3d ", iTTL);
//判断TCP标志位
unsigned char FlagMask = 1;
for( i=0; i<6; i++ )
{
if((pTcpHeader->th_flag) & FlagMask) printf("%c",TcpFlag[i]);
else printf("-");
FlagMask=FlagMask<<1;
}
printf(" bytes=%4d", iBufSize);
printf("");
//对于长度大于40字节的包进行数据分析(IP_HEADER+TCP_HEADER=40)
if ((ParamDecode) && (iBufSize>40))
{
//分析TCP数据段
if ((!strSensitive) (strstr(TcpData,strSensitive)))
{
printf(" [DATA]");
printf("%s",TcpData);
printf(" [DATA END]");
}
}
return true;
}


//UDP解包程序
int DecodeUdpPack(char * UdpBuf, int iBufSize)
{
UDP_HEADER *pUdpHeader;
pUdpHeader = (UDP_HEADER * )UdpBuf;
int iSourcePort = ntohs(pUdpHeader->uh_sport);
int iDestPort = ntohs(pUdpHeader->uh_dport);
//对端口进行过滤
if(iPortFilter)
if ((iSourcePort!=iPortFilter) && (iDestPort!=iPortFilter))
return true;
printf("%s ", szProtocol);
printf("%15s:%5d ->%15s:%5d ", szSourceIP, iSourcePort, szDestIP, iDestPort);
printf("TTL=%3d ", iTTL);
printf("Len=%4d ", ntohs(pUdpHeader->uh_len));
printf("bytes=%4d", iBufSize);
printf("");
//对于长度大于28字节的包进行数据分析(IP_HEADER+UDP_HEADER>28)
if ((ParamDecode) && (iBufSize>28))
{
printf(" [DATA]");
//UDP首部长度为8
char * UdpData=UdpBuf+8;
//分析UDP数据段
for(unsigned int i=0;i<(iBufSize-sizeof(UDP_HEADER));i++)
{
if (!(i%8)) printf("");
if ( (UdpData[i]>33) && (UdpData[i]<122) )
printf("%3c [%3x]", UdpData[i], UdpData[i]);
else printf(" [%3x]", abs(UdpData[i]));
}
printf(" [DATA END]");
}
return true;
}

//ICMP解包程序
int DecodeIcmpPack(char * IcmpBuf, int iBufSize)
{
ICMP_HEADER * pIcmpHeader;
pIcmpHeader = (ICMP_HEADER * )IcmpBuf;
int iIcmpType = pIcmpHeader->i_type;
int iIcmpCode = pIcmpHeader->i_code;
//对类型进行过滤
if ((iPortFilter) && (iIcmpType!=iPortFilter)) return true;
printf("%s ", szProtocol);
//printf("%15s Type%d ->%15s Code%d ", szSourceIP, iIcmpType, szDestIP, iIcmpCode);
printf("%15s ->%15s ", szSourceIP, szDestIP);
printf("TTL=%3d ", iTTL);
printf("Type%2d,%d ",iIcmpType,iIcmpCode);
printf("bytes=%4d", iBufSize);
printf("");
//对于包含数据段的包进行数据分析
if ((ParamDecode) && (iBufSize>28))
{
char * IcmpData=IcmpBuf+4;
//分析ICMP数据段
printf(" [DATA]");
for(unsigned int i=0;i<(iBufSize-sizeof(ICMP_HEADER));i++)
{
if (!(i%8)) printf("");
if ( (IcmpData[i]>33) && (IcmpData[i]<122) )
printf("%3c [%3x]", IcmpData[i], IcmpData[i]);
else printf(" [%3x]", abs(IcmpData[i]));
}
printf(" [DATA END]");
}
return true;
}

//命令行参数处理
bool GetCmdLine(int argc, char ** argv)
{
if (argc<2) return CMD_PARAM_HELP;
for(int i=1;i<argc;i++)
{
if(argv[i][0]!='/') return CMD_PARAM_HELP;
else switch (argv[i][1])
{
case 't':
case 'T': ParamTcp=true; break;
case 'u':
case 'U': ParamUdp=true; break;
case 'i':
case 'I': ParamIcmp=true; break;
case 'p':
case 'P': ParamDecode=true; break;
case 'f':
case 'F':
{
strFromIpFilter=(char*)malloc(16*sizeof(char));
memset(strFromIpFilter,0,16*sizeof(char));
strcpy(strFromIpFilter,argv[i]+3);
break;
}
case 'd':
case 'D':
{
strDestIpFilter=(char*)malloc(16*sizeof(char));
memset(strDestIpFilter,0,16*sizeof(char));
strcpy(strDestIpFilter,argv[i]+3);
break;
}
case 's':
case 'S':
{
strSensitive=(char*)malloc(255*sizeof(char));
memset(strSensitive,0,255*sizeof(char));
strcpy(strSensitive,argv[i]+3);
break;
}
case 'o':
case 'O':
{
iPortFilter=atoi(argv[i]+3);
break;
}
}
}
printf("Will Sniffer");
if(ParamTcp) printf(" TCP");
if(ParamUdp) printf(" UDP");
if(ParamIcmp) printf(" ICMP");
if(strFromIpFilter) printf(" FromIp:%s",strFromIpFilter);
if(strDestIpFilter) printf(" DestIp:%s",strDestIpFilter);
if(ParamDecode) printf(" DECODE ON");
if(strSensitive) printf(" Sensitive String:'%s'",strSensitive);
printf("CTRL+C to quitStart:");
return (!CMD_PARAM_HELP);
}

//使用说明
void usage(void)
{
printf("IPSpy");
printf("USAGE:");
printf("/t Output TCP Packets");
printf("/u Output UDP Packets");
printf("/i Output ICMP Packets");
printf("/p Decode Packets (default OFF)");
printf("/f: fromIP Output Packets FromIp=fromIP (default ALL)");
printf("/d: destIP Output Packets DestIp=destIP (default ALL)");
printf("/s: string Output Packets Include sensitive String(TCP only)");
printf("/o: port Output Packets from or to the port(ICMP is TYPE)");
printf("Example:");
printf("GUNiffer.exe /d>GUNiffer.log");
printf("GUNiffer.exe /t /u /f:192.168.15.231");
printf("GUNiffer.exe /t /p /s:PASS");
}

//SOCK错误处理程序
void CheckSockError(int iErrorCode, char *pErrorMsg)
{
if(iErrorCode==SOCKET_ERROR)
{
printf("%s Error:%d", pErrorMsg, GetLastError());
closesocket(SockRaw);
exit(0);
}

}