📄 00000005.htm
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caddr.sin_port=cport; <BR> <BR> sprintf(buf,"+CSOCK ADDR: %X:%X",cip,cport); <BR> perror(buf); <BR> if ((csock2=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP)) == -1) <BR> goto quit3; <BR> perror("+CSOCK2 CONNECT"); <BR> if (connect(csock2,&caddr,sizeof(caddr)) == -1) <BR> goto quit3; <BR> perror("+CSOCK2 CS"); <BR> } <BR> } <BR> <BR> if (FD_ISSET(csock,&fdsr) || FD_ISSET(csock,&fdse)) <BR> { <BR> perror("+CSOCK READ"); <BR> if ((nbyt=read(csock,buf,4096)) <= 0) <BR> goto quit2; <BR> <BR> if (osock2 != -1 && csock2 != -1 || <BR> strncasecmp(buf,"PORT",4)!=0) <BR> { <BR> if(write(osock,buf,nbyt) <= 0) <BR> goto quit2; <BR> } <BR> else <BR> { <BR> perror("+CSOCK PORT"); <BR> buf[nbyt+1]='\0'; <BR> perror(buf); <BR> sscanf(buf+4,"%u,%u,%u,%u,%u,%u",&c1,&c2,&c3,&c4,&c5,&c6); <BR> cip=(c4<<24)+(c3<<16)+(c2<<8)+c1; <BR> cport=(c6<<8)+c5; <BR> <BR> sprintf(buf,"+IP:%X PORT:%X",cip,cport); <BR> perror(buf); <BR> <BR> if ((osock2=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP)) == -1) <BR> goto quit3; <BR> laddr.sin_port=htons(0); <BR> laddr.sin_addr.s_addr=htonl(0); <BR> laddr.sin_family=htons(AF_INET); <BR> <BR> if (bind(osock2,&laddr,sizeof(laddr)) == -1) <BR> goto quit3; <BR> <BR> if (listen(osock2,1) == -1) <BR> goto quit3; <BR> <BR> a=localip; <BR> c1=a&0xff;a>>=8; <BR> c2=a&0xff;a>>=8; <BR> c3=a&0xff;a>>=8; <BR> c4=a; <BR> <BR> laddrlen=sizeof(laddr); <BR> if (getsockname(osock2,(struct sockaddr*)&laddr,&laddrlen) == -1) <BR> goto quit2; <BR> <BR> a=lport=laddr.sin_port; <BR> c5=a&0xff;a>>=8; <BR> c6=a&0xff; <BR> <BR> sprintf(buf,"+PORT %X,%X",localip,ntohs(lport)); <BR> perror(buf); <BR> sprintf(buf,"PORT %u,%u,%u,%u,%u,%u\n",c1,c2,c3,c4,c5,c6); <BR> perror(buf); <BR> if (write(osock,buf,strlen(buf)) <= 0) <BR> goto quit2; <BR> } <BR> } <BR> perror("+WHILE END"); <BR> } <BR>quit3: <BR> perror("+QUIT3"); <BR> if (osock2 != -1) <BR> close(osock2); <BR> if (csock2 != -1) <BR> close(csock2); <BR> <BR> osock2=csock2=-1; <BR> goto back; <BR>quit2: <BR> perror("+QUIT2"); <BR> if (osock2 != -1) <BR> close(osock2); <BR> if (csock2 != -1) <BR> close(csock2); <BR> <BR> shutdown(osock,2); <BR> close(osock); <BR>quit1: <BR> perror("+QUIT1"); <BR> fflush(cfile); <BR> shutdown(csock,2); <BR>quit0: <BR> perror("+QUIT0"); <BR> fclose(cfile); <BR> return 0; <BR>} <BR> <BR>-- <BR>凝神窗外的蓝天,绿叶随风摇弋。 <BR>面对缤纷的世界,我到底在追求什么? <BR> <BR> <BR> <BR> <BR>※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 202.119.79.72] <BR><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER></BODY></HTML>
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