htran.cpp

这是有关网络编程的程序

                       Sleep(10000);
                       break;
                 }
                 else
                 {
                       Sleep(TIMEOUT*1000);
                       continue;
                 }            
           }
*/
           
           if((sockfd1=create_socket())==0) return;
           if((sockfd2=create_socket())==0) return;

           printf("[+] Make a Connection to %s:%d....\r\n",host1,port1);
           fflush(stdout);
           if(client_connect(sockfd1,host1,port1)==0) 
           {
                 closesocket(sockfd1);
                 closesocket(sockfd2);
                 continue;
           }
           
           // fix by bkbll 
           // if host1:port1 recved data, than connect to host2,port2
           l=0;
           memset(buffer,0,MAXSIZE);
           while(1)
           {
                 FD_ZERO(&fds);
                 FD_SET(sockfd1, &fds);
                 
                 if (select(sockfd1+1, &fds, NULL, NULL, NULL) == SOCKET_ERROR) 
                 {
                       if (errno == WSAEINTR) continue;
                       break;
                 }
                 if (FD_ISSET(sockfd1, &fds)) 
                 {
                       l=recv(sockfd1, buffer, MAXSIZE, 0);
                       break;
                 }
                 Sleep(5);
           }

           if(l<=0) 
           {      
                 printf("[-] There is a error...Create a new connection.\r\n");
                 continue;
           }
           while(1)
           {
                 printf("[+] Connect OK!\r\n");
                 printf("[+] Make a Connection to %s:%d....\r\n", host2,port2);
                 fflush(stdout);
                 if(client_connect(sockfd2,host2,port2)==0) 
                 {
                       closesocket(sockfd1);
                       closesocket(sockfd2);
                       continue;
                 }

                 if(send(sockfd2,buffer,l,0)==SOCKET_ERROR)
                 {      
                       printf("[-] Send failed.\r\n");
                       continue;
                 }

                 l=0;
                 memset(buffer,0,MAXSIZE);
                 break;
           }
     
           printf("[+] All Connect OK!\r\n");

           sock.fd1 = sockfd1;
           sock.fd2 = sockfd2;

           hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)transmitdata, (LPVOID)&sock, 0, &dwThreadID); 
           if(hThread == NULL) 
           {
                 TerminateThread(hThread, 0);
                 return;
           }

//            connectnum++;

           Sleep(1000);
           printf("[+] CreateThread OK!\r\n\n");
     }
}

//************************************************************************************
// 
// Socket Transmit to Socket
//
//************************************************************************************
void transmitdata(LPVOID data)
{
     SOCKET fd1, fd2;
     transocket *sock;
     struct timeval timeset;
     fd_set readfd,writefd;
     int result,i=0;
     char read_in1[MAXSIZE],send_out1[MAXSIZE];
     char read_in2[MAXSIZE],send_out2[MAXSIZE];
     int read1=0,totalread1=0,send1=0;
     int read2=0,totalread2=0,send2=0;
     int sendcount1,sendcount2;
     int maxfd;
     struct sockaddr_in client1,client2;
     int structsize1,structsize2;
     char host1[20],host2[20];
     int port1=0,port2=0;
     char tmpbuf[100];

     sock = (transocket *)data;
     fd1 = sock->fd1;
     fd2 = sock->fd2;

     memset(host1,0,20);
     memset(host2,0,20);
     memset(tmpbuf,0,100);

     structsize1=sizeof(struct sockaddr);
     structsize2=sizeof(struct sockaddr);
     
     if(getpeername(fd1,(struct sockaddr *)&client1,&structsize1)<0)
     {
           strcpy(host1, "fd1");
     }
     else
     {      
//            printf("[+]got, ip:%s, port:%d\r\n",inet_ntoa(client1.sin_addr),ntohs(client1.sin_port));
           strcpy(host1, inet_ntoa(client1.sin_addr));
           port1=ntohs(client1.sin_port);
     }

     if(getpeername(fd2,(struct sockaddr *)&client2,&structsize2)<0)
     {
           strcpy(host2,"fd2");
     }
     else
     {      
//            printf("[+]got, ip:%s, port:%d\r\n",inet_ntoa(client2.sin_addr),ntohs(client2.sin_port));
           strcpy(host2, inet_ntoa(client2.sin_addr));
           port2=ntohs(client2.sin_port);
     }

     printf("[+] Start Transmit (%s:%d <-> %s:%d) ......\r\n\n", host1, port1, host2, port2);
  
     maxfd=max(fd1,fd2)+1;
     memset(read_in1,0,MAXSIZE);
     memset(read_in2,0,MAXSIZE);
     memset(send_out1,0,MAXSIZE);
     memset(send_out2,0,MAXSIZE);
  
     timeset.tv_sec=TIMEOUT;
     timeset.tv_usec=0;

     while(1)
     {
           FD_ZERO(&readfd);
           FD_ZERO(&writefd); 
       
           FD_SET((UINT)fd1, &readfd);
           FD_SET((UINT)fd1, &writefd);
           FD_SET((UINT)fd2, &writefd);
           FD_SET((UINT)fd2, &readfd);
       
           result=select(maxfd,&readfd,&writefd,NULL,&timeset);
           if((result<0) && (errno!=EINTR))
           {
                 printf("[-] Select error.\r\n");
                 break;
           }
           else if(result==0)
           {
                 printf("[-] Socket time out.\r\n");
                 break;
           }
           
           if(FD_ISSET(fd1, &readfd))
       {
                 /* must < MAXSIZE-totalread1, otherwise send_out1 will flow */
                 if(totalread1<MAXSIZE)
               {
                       read1=recv(fd1, read_in1, MAXSIZE-totalread1, 0); 
                       if((read1==SOCKET_ERROR) || (read1==0))
                       {
                             printf("[-] Read fd1 data error,maybe close?\r\n");
                             break;
                       }
                 
                       memcpy(send_out1+totalread1,read_in1,read1);
                       sprintf(tmpbuf,"\r\nRecv %5d bytes from %s:%d\r\n", read1, host1, port1);
                       printf(" Recv %5d bytes %16s:%d\r\n", read1, host1, port1);
                       makelog(tmpbuf,strlen(tmpbuf));
                       makelog(read_in1,read1);
                       totalread1+=read1;
                       memset(read_in1,0,MAXSIZE);
                 }
           }

           if(FD_ISSET(fd2, &writefd))
           {
                 int err=0;
                 sendcount1=0;
                 while(totalread1>0)
                 {
                       send1=send(fd2, send_out1+sendcount1, totalread1, 0);
                       if(send1==0)break;
                       if((send1<0) && (errno!=EINTR))
                       {
                             printf("[-] Send to fd2 unknow error.\r\n");
                             err=1;
                             break;
                       }
                       
                       if((send1<0) && (errno==ENOSPC)) break;
                       sendcount1+=send1;
                       totalread1-=send1; 

                       printf(" Send %5d bytes %16s:%d\r\n", send1, host2, port2);
                 }
               
                 if(err==1) break;
                 if((totalread1>0) && (sendcount1>0))
                 {
                       /* move not sended data to start addr */
                       memcpy(send_out1,send_out1+sendcount1,totalread1);
                       memset(send_out1+totalread1,0,MAXSIZE-totalread1);
                 }
                 else
                 memset(send_out1,0,MAXSIZE);
           } 
           
           if(FD_ISSET(fd2, &readfd))
           {
                 if(totalread2<MAXSIZE)
                 {
                       read2=recv(fd2,read_in2,MAXSIZE-totalread2, 0); 
                       if(read2==0)break;
                       if((read2<0) && (errno!=EINTR))
                       {
                             printf("[-] Read fd2 data error,maybe close?\r\n\r\n");
                             break;
                       }

                       memcpy(send_out2+totalread2,read_in2,read2);
                       sprintf(tmpbuf, "\r\nRecv %5d bytes from %s:%d\r\n", read2, host2, port2);
                       printf(" Recv %5d bytes %16s:%d\r\n", read2, host2, port2);
                       makelog(tmpbuf,strlen(tmpbuf));
                 makelog(read_in2,read2);
                 totalread2+=read2;
                 memset(read_in2,0,MAXSIZE);
                 }
    }

           if(FD_ISSET(fd1, &writefd))
       {
                 int err2=0;
               sendcount2=0;
               while(totalread2>0)
               {
                     send2=send(fd1, send_out2+sendcount2, totalread2, 0);
                     if(send2==0)break;
                     if((send2<0) && (errno!=EINTR))
                     {
                           printf("[-] Send to fd1 unknow error.\r\n");
                             err2=1;
                           break;
                     }
                     if((send2<0) && (errno==ENOSPC)) break;
                     sendcount2+=send2;
                     totalread2-=send2; 
                       
                       printf(" Send %5d bytes %16s:%d\r\n", send2, host1, port1);
               }
                 if(err2==1) break;
             if((totalread2>0) && (sendcount2 > 0))
                 {
                       /* move not sended data to start addr */
                       memcpy(send_out2, send_out2+sendcount2, totalread2);
                       memset(send_out2+totalread2, 0, MAXSIZE-totalread2);
                 }
                 else
                       memset(send_out2,0,MAXSIZE);
           } 

           Sleep(5);
     } 
  
     closesocket(fd1);
     closesocket(fd2);
//      if(method == 3)
//            connectnum --;
     
     printf("\r\n[+] OK! I Closed The Two Socket.\r\n"); 
}

void getctrlc(int j)
{
     printf("\r\n[-] Received Ctrl+C\r\n");
     closeallfd();
     exit(0);
}

void closeallfd()
{
     int i;

     printf("[+] Let me exit ......\r\n");
     fflush(stdout);

     for(i=3; i<256; i++)
     {
           closesocket(i);      
     }

     if(fp != NULL) 
     {
           fprintf(fp,"\r\n====== Exit ======\r\n");
           fclose(fp);
     }

     printf("[+] All Right!\r\n");
}

int create_socket()
{ 
     int sockfd;

     sockfd=socket(AF_INET,SOCK_STREAM,0);
     if(sockfd<0)
     {
           printf("[-] Create socket error.\r\n");
           return(0);
     }
     
     return(sockfd);      
}

int create_server(int sockfd,int port)
{
     struct sockaddr_in srvaddr;
     int on=1;
    
     memset(&srvaddr, 0, sizeof(struct sockaddr));

     srvaddr.sin_port=htons(port);
     srvaddr.sin_family=AF_INET;
     srvaddr.sin_addr.s_addr=htonl(INADDR_ANY);
  
     setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR, (char*)&on,sizeof(on)); //so I can rebind the port

     if(bind(sockfd,(struct sockaddr *)&srvaddr,sizeof(struct sockaddr))<0)
     {
           printf("[-] Socket bind error.\r\n");
           return(0);
     }

     if(listen(sockfd,CONNECTNUM)<0)
     {
           printf("[-] Socket Listen error.\r\n");
           return(0);
     }
     
     return(1);
}

int client_connect(int sockfd,char* server,int port)
{
  struct sockaddr_in cliaddr;
  struct hostent *host;

  if(!(host=gethostbyname(server)))
  {
        printf("[-] Gethostbyname(%s) error:%s\n",server,strerror(errno));
        return(0);
  }      
  
  memset(&cliaddr, 0, sizeof(struct sockaddr));
  cliaddr.sin_family=AF_INET;
  cliaddr.sin_port=htons(port);
  cliaddr.sin_addr=*((struct in_addr *)host->h_addr);
  
  if(connect(sockfd,(struct sockaddr *)&cliaddr,sizeof(struct sockaddr))<0)
  {
        printf("[-] Connect error.\r\n");
        return(0);
  }
  return(1);
}

void makelog(char *buffer,int length)
{
     if(fp !=NULL)
     {
//            fprintf(fp, "%s", buffer);
//            printf("%s",buffer);
           write(fileno(fp),buffer,length);
//            fflush(fp);
     }
}