★★所有分赠送大虾，谁能告诉我抓取ip包的基本原理吗？用java怎么实现？急！！！

上面的大虾，请问你说的好像是得到对方的ip地址啊，我怎么能知道他在访问什么东西呢？比如我如何知道他是否开这qq等等？给点思路，多谢多谢
救救我啊，谁能给我将将ipman那个c程序是怎么编写出来的啊，基本原理是什么？我不懂c，多谢，用java怎么去实现啊，看了网络编程的书，摸不着方向
我这里有sniffer的源代码，谁熟悉c，帮我研究一下，得出监视别人的数据包的方法，多谢
#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 truetypedef 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=true; // -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int DecodeIpPack(char *,int);
int DecodeTcpPack(char *);
int DecodeUdpPack(char *);
int DecodeIcmpPack(char *);
void CheckSockError(int,char*);
char * CheckProtocol(int);
void usage(void);
bool GetCmdLine(int, char **);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);
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;
int iProtocol, iTTL;
char szProtocol[MAX_PROTO_TEXT_LEN];
char szSourceIP[MAX_ADDR_LEN], szDestIP[MAX_ADDR_LEN];
SOCKADDR_IN saSource, saDest;
pIpheader = (IP_HEADER *)buf;
//Check Proto
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;
//Check Source IP
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;
//Check Dest IP
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;
//Output
printf("%s ", szProtocol);
printf("%s->%s ", szSourceIP, szDestIP);
printf("bytes=%d TTL=%d ",iBufSize,iTTL);
//Calculate IP Header Length
int iIphLen = sizeof(unsigned long) * (pIpheader->h_lenver & 0xf);
//Decode Sub Protocol:TCP, UDP, ICMP, etc
switch(iProtocol)
{
case IPPROTO_TCP :DecodeTcpPack(buf+iIphLen);break;
case IPPROTO_UDP :DecodeUdpPack(buf+iIphLen);break;
case IPPROTO_ICMP :DecodeIcmpPack(buf+iIphLen);break;
default :break;
}
//printf("\n");
return true;
}//SOCK错误处理程序
void CheckSockError(int iErrorCode, char *pErrorMsg)
{
if(iErrorCode==SOCKET_ERROR)
{
printf("%s Error:%d\n", pErrorMsg, GetLastError());
closesocket(SockRaw);
exit(0);
}}//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)
{
TCP_HEADER * pTcpHeader;
int i;
pTcpHeader = (TCP_HEADER * )TcpBuf;
printf("Port:%d->%d ", ntohs(pTcpHeader->th_sport),ntohs(pTcpHeader->th_dport));
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("\n");
return true;
}//UDP解包程序
int DecodeUdpPack(char * UdpBuf)
{
UDP_HEADER *pUdpHeader;
pUdpHeader = (UDP_HEADER * )UdpBuf;
printf("Port:%d->%d ", ntohs(pUdpHeader->uh_sport), ntohs(pUdpHeader->uh_dport));
printf("Len=%d\n", ntohs(pUdpHeader->uh_len));
return true;
}//ICMP解包程序
int DecodeIcmpPack(char * IcmpBuf)
{
ICMP_HEADER *pIcmpHeader;
pIcmpHeader = (ICMP_HEADER * )IcmpBuf;
printf("Type:%d,%d ", pIcmpHeader->i_type,pIcmpHeader->i_code);
printf("ID=%d SEQ=%d\n", pIcmpHeader->i_id, pIcmpHeader->i_seq);
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;
}
}
}
printf("\nWill 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);
printf("\n\tCTRL+C to quit\nStart:\n");
return (!CMD_PARAM_HELP);
}//使用说明
void usage(void)
{
printf("GUNiffer\n");
printf("\tSinffer for Win2K By Shotgun (Ver 0.2)\n");
printf("\[email protected]\n");
printf("\thttp://It.Xici.Net\n");
printf("\thttp://www.Patching.Net\n\n");
printf("USAGE:\n");
printf("\t/t　　　　　Output TCP　Packets\n");
printf("\t/u　　　　　Output UDP　Packets\n");
printf("\t/i　　　　　Output ICMP Packets\n");
printf("\t/p　　　　　Decode Packets (default OFF)\n");
printf("\t/f: fromIP　Output Packets FromIp=fromIP (default ALL)\n");
printf("\t/d: destIP　Output Packets DestIp=destIP (default ALL)");
printf("\nExample:\n");
printf("\tGUNiffer.exe /d>IpPack.log\n");
printf("\tGUNiffer.exe /t /u /f:192.168.15.231\n");
}

调试易

★★所有分赠送大虾，谁能告诉我抓取ip包的基本原理吗？用java怎么实现？急！！！

解决方案 »