发信人: angellotus(ANGELLOTUS)
整理人: williamlong(2002-12-01 16:41:24), 站内信件
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首先，我们更改QQ客户端里的服务器地址为127.0.0.1，端口改为QQicmp(l)的监听QQ客户端端口，当然你也可以保持默认的8000，这样QQicmp(l)就应该在8000端口监听QQ客户端的数据。同时，QQ客户端也在端口4000（假设为非内网主机上的第一个QQ）监听来自QQicmp(l)的数据报。
我们可以看到，QQicmp(l)的主要作用就是将接收到了来自QQ客户端的UPD数据报，
sock[0][0]=socket(AF_INET,SOCK_DGRAM,0); //创建基于UDP协议的套接字
bind(sock[0][0],(struct sockaddr *)&sin[0][1],addrlen); //绑定到指定地址，指定端口上
iret=recvfrom(sock[0][0],msgrecv,sizeof(msgrecv),0,(struct sockaddr *)&tempr,&addrlen); //接收来自QQ客户端的UDP数据
然后以ICMP数据报的形式发送到QQicmp(g)，在此需要自己构造ICMP echo Reply数据报,并将接收到的UDP数据报填充到ICMP报文的数据段，
sock[0][1]=socket(AF_INET,SOCK_RAW,IPPROTO_ICMP); //创建ICMP协议的原始套接字，用来发送自定义数据报
bind(sock[0][1],(struct sockaddr *)&sin[0][2],addrlen); //并捆绑到指定地址，指定端口上
icmphdr.type=0; //类型：echo reply
icmphdr.code=0; //代码
icmphdr.id=htons(65456); //序号
icmphdr.seq=htons(65456); //标志符，用以过滤数据报
icmphdr.checksum=0;
if(istbcs==0) //填充ICMP数据报头部
{
memset(msgsend,0,sizeof(msgsend));
memcpy(msgsend,&icmphdr,sizeof(icmphdr));
istbcs+=sizeof(icmphdr);
}
memcpy(msgsend+istbcs,msgrecv,iret); //将接收到的UDP数据报的内容提取，准备以ICMP的形式发送
iret=sendto(sock[0][1],msgsend,istbcs,0,(struct sockaddr *)&sin[0][3],addrlen); //发送到网关
同时，QQicmp(l)监听通过本机的IP数据报，筛选出来自QQicmp(g)及网关的数据报，
sock[1][0]=socket(AF_INET,SOCK_RAW,IPPROTO_IP); //创建原始套接字，接收所有的IP数据报
bind(sock[1][0],(struct sockaddr *)&sin[1][1],addrlen); //绑定到指定地址，端口
DWORD dwbufferlen[10];
DWORD dwbufferinlen=1;
DWORD dwbytesreturned=0;
WSAIoctl(sock[1][0],SIO_RCVALL,&dwbufferinlen,sizeof(dwbufferinlen),&dwbufferlen,sizeof(dwbufferlen),&dwbytesreturned,NULL,NULL);
//设置为接收所有的数据报，需要mstcpip.h头文件，T-QQ相关文件里就有，或安装SDK
iret=recvfrom(sock[1][0],msgrecv,sizeof(msgrecv),0,(struct sockaddr *)&temps,&addrlen); //接收所有数据报
if(iret<=28) //文件过小
{
break;
}
if((icmphdr->type!=0) || (icmphdr->code!=0) || ((icmphdr->id)!=htons(65456)) || ((icmphdr->seq)!=htons(65456))) //不符合接收条件
{
break;
}
memcpy(msgsend+istbcs,msgrecv,iret); //将接收到的ICMP数据报的内容提取，准备以UDP的形式发送
解包后，用UDP数据报将接收到的来自网关的数据发送到QQ客户端，
idx=28; //ICMP数据报的前20字节是IP头部，接着的8字节是ICMP头部，
iret=sendto(sock[1][1],&msgsend[idx],ileft,0,(struct sockaddr *)&sin[1][3],addrlen); //发送到QQ客户端
我们创建了两个线程在两个方向(udp-->icmp,icmp-->udp)上接收并传送数据，如果某个线程出错，就重新创建该线程，而未出错的线程则保持不变，
hthreads[0]=CreateThread(NULL,0,u2i,(LPVOID)0,NULL,&hthreadid[0]); //创建udp接收数据，icmp发送数据的线程0
hthreads[1]=CreateThread(NULL,0,i2u,(LPVOID)1,NULL,&hthreadid[1]); //创建icmp接收数据，udp发送数据的线程1
while(1)
{
dwret=WaitForMultipleObjects(2,hthreads,false,INFINITE); //等待某个线程的结束
if(dwret==WAIT_FAILED) //等待出错
{
cout<<"WaitForMultipleObjects Error: "<<GetLastError()<<endl;
return -1;
}
log=dwret-WAIT_OBJECT_0;
if(log==0) //线程0结束
{
CloseHandle(hthreads[0]); //关闭线程handle
closesocket(sock[0][1]); //关闭套接字
hthreads[0]=CreateThread(NULL,0,u2i,(LPVOID)0,NULL,&hthreadid[0]); //重新创建线程0
}
else if(log==1) //线程1结束
{
CloseHandle(hthreads[1]);
closesocket(sock[1][0]);
hthreads[1]=CreateThread(NULL,0,i2u,(LPVOID)1,NULL,&hthreadid[1]);
}
以上就是QQicmp(l)的工作原理，QQicmp(g)运行在网关上，虽然模式不同，但工作原理是一样的，只是数据报的流动方向有点差异。
QQicmp之源代码如下:
#include <iostream.h>
#include <winsock2.h>
#include <windows.h>
#include <mstcpip.h>
#pragma comment (lib,"ws2_32")
#define maxsize 64*1024
typedef struct ipheader
{
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;
}ipheader;
typedef struct icmpheader
{
unsigned char type;
unsigned char code;
unsigned short checksum;
unsigned short seq;
unsigned short id;
}icmpheader;
unsigned short checksum(unsigned short *buffer,int size)
{
unsigned long cksum=0;
while(size>0)
{
cksum+=*buffer++;
size-=sizeof(unsigned short);
}
if(size)
cksum+=*(unsigned char *)buffer;
cksum=(cksum>>16)+(cksum & 0xffff);
cksum+=(cksum>>16);
return (unsigned short)(~cksum);
}
void start()
{
cout<<" ---------------------------------------------------\n";
cout<<" || || \n";
cout<<" || QQicmp (ICMP转发) || \n";
cout<<" || || \n";
cout<<" || Author:TOo2y SafeChina || \n";
cout<<" || || \n";
cout<<" ---------------------------------------------------"<<endl;
}
void usage()
{
cout<<"\nUsage:\r\n\tQQicmp -l[-g] ip port"<<endl;
cout<<"\tQQicmp -h"<<endl;
cout<<"Example:\r\n";
cout<<"\tQQicmp -l 192.168.0.1 8000"<<endl;
cout<<"\tQQicmp -g 61.144.238.156 11282"<<endl;
cout<<"Attention:"<<endl;
cout<<"\t选项 -l : 运行于本机上，ip填网关地址，port为本地监听客户端端口;"<<endl;
cout<<"\t选项 -g : 运行于网关上，ip填腾讯服务器地址，port为自定义端口;"<<endl;
cout<<"\t选项 -h : 查看相关帮助文件。"<<endl;
}
int addrlen=sizeof(struct sockaddr_in);
SOCKET sock[2][2];
struct sockaddr_in sin[2][4],sag,sal,tempr,temps;
DWORD WINAPI u2i(LPVOID num)
{
UNREFERENCED_PARAMETER(num);
char msgrecv[maxsize]={0},msgsend[maxsize]={0};
fd_set fdread,fdwrite;
int iret,ret,istbcs=0;
struct icmpheader icmphdr;
memset(&icmphdr,0,sizeof(icmphdr));
icmphdr.code=0;
icmphdr.id=htons(65456);
icmphdr.seq=htons(65456);
icmphdr.type=0;
icmphdr.checksum=checksum((unsigned short *)&icmphdr,sizeof(icmphdr));
if((sock[0][1]=socket(AF_INET,SOCK_RAW,IPPROTO_ICMP))==INVALID_SOCKET)
{
cout<<"Socket sock[0][1] Error: "<<GetLastError()<<endl;
return -1;
}
if(bind(sock[0][1],(struct sockaddr *)&sin[0][2],addrlen)==SOCKET_ERROR)
{
cout<<"Bind sock[0][1] Error: "<<GetLastError()<<endl;
return -1;
}
while(1)
{
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
FD_SET(sock[0][0],&fdread);
FD_SET(sock[0][1],&fdwrite);
if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR)
{
cout<<"Select in thread 0 Error: "<<GetLastError()<<endl;
break;
}
if(ret>0)
{
if(FD_ISSET(sock[0][0],&fdread))
{
iret=recvfrom(sock[0][0],msgrecv,sizeof(msgrecv),0,(struct sockaddr *)&tempr,&addrlen);
if(iret==SOCKET_ERROR)
{
cout<<"\nRecvfrom sock[0][0] Error: "<<GetLastError()<<endl;
break;
}
else if(iret==0)
{
cout<<"Iret==0"<<endl;
break;
}
cout<<"\nThread 0 Recv "<<iret<<" bytes from\t"<<inet_ntoa(tempr.sin_addr)<<endl;
if(istbcs==0)
{
memset(msgsend,0,sizeof(msgsend));
memcpy(msgsend,&icmphdr,sizeof(icmphdr));
istbcs+=sizeof(icmphdr);
}
memcpy(msgsend+istbcs,msgrecv,iret);
istbcs+=iret;
memset(msgrecv,0,sizeof(msgrecv));
}
else if(FD_ISSET(sock[0][1],&fdwrite))
{
while(istbcs>0)
{
if(sin[0][3].sin_addr.s_addr==htonl(0))
{
cout<<"sin[0][3].sin_addr.s_addr==htonl(0)"<<endl;
istbcs=0;
memset(msgsend,0,sizeof(msgsend));
break;
}
iret=sendto(sock[0][1],msgsend,istbcs,0,(struct sockaddr *)&sin[0][3],addrlen);
if(iret==SOCKET_ERROR)
{
cout<<"Sendto sock[0][1] Error: "<<GetLastError()<<endl;
break;
}
cout<<"Thread 0 send "<<iret<<" bytes to \t"<<inet_ntoa(sin[0][3].sin_addr)<<endl;
istbcs-=iret;
}
memset(msgsend,0,sizeof(msgsend));
istbcs=0;
}
Sleep(20);
}
}
return 0;
}
DWORD WINAPI i2u(LPVOID num)
{
UNREFERENCED_PARAMETER(num);
fd_set fdread,fdwrite;
char msgrecv[maxsize]={0},msgsend[maxsize]={0};
int ret,iret,idx,istbcs=0,ileft;
DWORD dwbufferlen[10];
DWORD dwbufferinlen=1;
DWORD dwbytesreturned=0;
struct ipheader *iphdr;
struct icmpheader *icmphdr;
if((sock[1][0]=socket(AF_INET,SOCK_RAW,IPPROTO_IP))==INVALID_SOCKET)
{
cout<<"Socket sock[1][0] Error: "<<GetLastError()<<endl;
return -1;
}
if(bind(sock[1][0],(struct sockaddr *)&sin[1][1],addrlen)==SOCKET_ERROR)
{
cout<<"Bind sock[1][0] Error: "<<GetLastError()<<endl;
return -1;
}
WSAIoctl(sock[1][0],SIO_RCVALL,&dwbufferinlen,sizeof(dwbufferinlen),&dwbufferlen,sizeof(dwbufferlen),&dwbytesreturned,NULL,NULL);
iphdr=(struct ipheader *)msgrecv;
icmphdr=(struct icmpheader *)(msgrecv+sizeof(struct ipheader));
while(1)
{
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
FD_SET(sock[1][0],&fdread);
FD_SET(sock[1][1],&fdwrite);
if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR)
{
cout<<"Select in thread 1 Error: "<<GetLastError()<<endl;
break;
}
if(ret>0)
{
if(FD_ISSET(sock[1][0],&fdread))
{
{
iret=recvfrom(sock[1][0],msgrecv,sizeof(msgrecv),0,(struct sockaddr *)&temps,&addrlen);
if(iret==SOCKET_ERROR)
{
cout<<"Recvfrom sock[1][0] Error: "<<GetLastError()<<endl;
break;
}
if(iret<=28)
{
break;
}
if((icmphdr->type!=0) || (icmphdr->code!=0) || ((icmphdr->id)!=htons(65456)) || ((icmphdr->seq)!=htons(65456)))
{
break;
}
if((sin[1][0].sin_addr.s_addr!=htonl(0)) && (sin[1][0].sin_addr.s_addr!=temps.sin_addr.s_addr))
break;
}
else if(sin[1][0].sin_addr.s_addr==htonl(0))
{
sin[1][0].sin_addr.s_addr=temps.sin_addr.s_addr;
sin[0][3].sin_addr.s_addr=temps.sin_addr.s_addr;
cout<<"sin[0][3] ==> "<<inet_ntoa(sin[0][3].sin_addr)<<endl;
}
cout<<"\nThread 1 Recv "<<iret<<" bytes from \t"<<inet_ntoa(temps.sin_addr)<<endl;
memcpy(msgsend+istbcs,msgrecv,iret);
istbcs+=iret;
memset(msgrecv,0,sizeof(msgrecv));
}
}
else if(FD_ISSET(sock[1][1],&fdwrite))
{
ileft=istbcs-28;
idx=28;
while(ileft>0)
{
iret=sendto(sock[1][1],&msgsend[idx],ileft,0,(struct sockaddr *)&sin[1][3],addrlen);
if(iret==SOCKET_ERROR)
{
cout<<"Sendto sock[1][1] Error: "<<GetLastError()<<endl;
break;
}
cout<<"Thread 1 send "<<iret<<" bytes to \t"<<inet_ntoa(sin[1][3].sin_addr)<<endl;
ileft-=iret;
idx+=iret;
}
istbcs=0;
memset(msgsend,0,sizeof(msgsend));
}
Sleep(20);
}
}
return 0;
}
int main(int argc,char *argv[])
{
WSADATA wsa;
BOOL gl;
HANDLE hthreads[2];
DWORD hthreadid[2];
struct hostent *hp;
char cname[100];
int dwret,log;
system("cls.exe");
start();
if(argc==2)
{
if(strcmp(argv[1],"-h")==0)
{
ShellExecute(NULL,"open","help.txt",NULL,NULL,SW_SHOWMAXIMIZED);
return 0;
}
else
{
usage();
return -1;
}
}
else if(argc!=4)
{
usage();
return -1;
}
if(!strcmp(argv[1],"-g"))
gl=true;
else if(!strcmp(argv[1],"-l"))
gl=false;
else
{
usage();
return -1;
}
if(WSAStartup(MAKEWORD(2,2),&wsa)!=0)
{
cout<<"WSAStartup Error: "<<GetLastError()<<endl;
return -1;
}
gethostname(cname,sizeof(cname));
hp=gethostbyname(cname);
for(int ipnum=0;hp->h_addr_list[ipnum]!=NULL;ipnum++)
sag.sin_addr=*(in_addr *)hp->h_addr_list[ipnum];
sag.sin_family=AF_INET;
sag.sin_port=htons(65456);
sal=sag;
if(ipnum>1)
sal.sin_addr=*(in_addr *)hp->h_addr_list[ipnum-2];
if(gl)
{
sin[0][0].sin_addr.s_addr=inet_addr(argv[2]);
sin[0][0].sin_family=AF_INET;
sin[0][0].sin_port=htons(8000);
sin[0][1].sin_addr.s_addr=htonl(INADDR_ANY);
sin[0][1].sin_family=AF_INET;
sin[0][1].sin_port=htons(atoi(argv[3]));
sin[0][2]=sal;
memset(&sin[0][3],0,sizeof(sin[0][3]));
sin[0][3].sin_family=AF_INET;
}
else
{
sin[0][0].sin_addr.s_addr=inet_addr("127.0.0.1");
sin[0][0].sin_family=AF_INET;
sin[0][0].sin_port=htons(4000);
sin[0][1].sin_addr.s_addr=htonl(INADDR_ANY);
sin[0][1].sin_family=AF_INET;
sin[0][1].sin_port=htons(atoi(argv[3]));
sin[0][2]=sal;
sin[0][3].sin_addr.s_addr=inet_addr(argv[2]);
sin[0][3].sin_family=AF_INET;
}
sin[1][0]=sin[0][3];
sin[1][1]=sin[0][2];
sin[1][2]=sin[0][1];
sin[1][3]=sin[0][0];
if((sock[0][0]=socket(AF_INET,SOCK_DGRAM,0))==INVALID_SOCKET)
{
cout<<"Socket sock[0][0] Error: "<<GetLastError()<<endl;
return -1;
}
if(bind(sock[0][0],(struct sockaddr *)&sin[0][1],addrlen)==SOCKET_ERROR)
{
cout<<"Bind sock[0][0] Error: "<<GetLastError()<<endl;
return -1;
}
sock[1][1]=sock[0][0];
cout<<"\n正常工作中..."<<endl;
hthreads[0]=CreateThread(NULL,0,u2i,(LPVOID)0,NULL,&hthreadid[0]);
hthreads[1]=CreateThread(NULL,0,i2u,(LPVOID)1,NULL,&hthreadid[1]);
while(1)
{
dwret=WaitForMultipleObjects(2,hthreads,false,INFINITE);
if(dwret==WAIT_FAILED)
{
cout<<"WaitForMultipleObjects Error: "<<GetLastError()<<endl;
return -1;
}
log=dwret-WAIT_OBJECT_0;
if(log==0)
{
CloseHandle(hthreads[0]);
closesocket(sock[0][1]);
hthreads[0]=CreateThread(NULL,0,u2i,(LPVOID)0,NULL,&hthreadid[0]);
}
else if(log==1)
{
CloseHandle(hthreads[1]);
closesocket(sock[1][0]);
hthreads[1]=CreateThread(NULL,0,i2u,(LPVOID)1,NULL,&hthreadid[1]);
}
else
{
for(int no1=0;no1<2;no1++)
{
CloseHandle(hthreads[no1]);
for(int no2=0;no2<2;no2++)
closesocket(sock[no1][no2]);
}
}
}
WSACleanup();
return 0;
}
本文相关软件T-QQ主要针对禁止使用QQ的网关，提供UDP，TCP及ICMP数据报转发功能，本软件同样适用于各种基于UDP协议的通信软件。其中的TCP数据报转发功能，也可以使用UDP数据报来转发TCP数据。相关软件及源代码下载地址： http://www.cshu.net/down/t-qq.rar
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