给FreeBSD写了个802.1X认证客户端

  goto retry;
 }

 p=buf+((struct bpf_hdr *)buf)->;bh_hdrlen;

 if((((EAPOL *)(p+12))->;type!=EAPOL_Packet)||(((EAP *)(p+12+sizeof(EAPOL)))->;code!=EAP_Request)
  ||(((EAP *)(p+12+sizeof(EAPOL)))->;type!=EAP_TYPE_Identity))
 {
  printf("EAP Request Identity format error!\n");
  goto retry;
 }
 id=((EAP *)(p+12+sizeof(EAPOL)))->;id;
 memcpy(dstMAC,p+6,6);
 //构造EAP Response Identity帧
 printf("send EAP Response Identity packet!\n");
 memset(buf,0,blen);
 memcpy(buf,dstMAC,6);
 ((EAPOL *)(buf+12))->;ethertype=htons(0x888E);
 ((EAPOL *)(buf+12))->;version=1;
 ((EAPOL *)(buf+12))->;type=EAPOL_Packet;
 ((EAPOL *)(buf+12))->;length=htons(sizeof(EAP)+sizeof(name));
 ((EAP *)(buf+12+sizeof(EAPOL)))->;code=EAP_Response;
 ((EAP *)(buf+12+sizeof(EAPOL)))->;id=id;
 ((EAP *)(buf+12+sizeof(EAPOL)))->;length=htons(sizeof(EAP)+sizeof(name));
 ((EAP *)(buf+12+sizeof(EAPOL)))->;type=EAP_TYPE_Identity;
 memcpy(buf+12+sizeof(EAPOL)+sizeof(EAP),name,sizeof(name));
 memcpy(buf+12+sizeof(EAPOL)+sizeof(EAP)+sizeof(name),pad,sizeof(pad));
 if(1000!=write(bpf,buf,1000)) //发送EAP Response Identity帧
 {
  perror("write EAP Response Identity error");
  goto retry;
 }
 //读取EAP Request MD5-Challenge帧
 FD_ZERO(&readset);
 FD_SET(bpf, &readset);
 ioctl(bpf,BIOCFLUSH);
 if(1!=select(bpf+1,&readset,NULL,NULL,&timeout))
 {
  perror("select read EAP Request MD5-Challenge");
  goto retry;
 }
 if(-1==read(bpf,buf,blen))
 {
  perror("read EAP Request MD5-Challenge errorr");
  goto retry;
 }

 p=buf+((struct bpf_hdr *)buf)->;bh_hdrlen;

 if((((EAPOL *)(p+12))->;type!=EAPOL_Packet)||(((EAP *)(p+12+sizeof(EAPOL)))->;code!=EAP_Request)
  ||(((EAP *)(p+12+sizeof(EAPOL)))->;type!=EAP_TYPE_MD5Challenge))
 {
  printf("EAP Request MD5-Challenge format error!\n");
  goto retry;
 }

 id=((EAP *)(p+12+sizeof(EAPOL)))->;id;
 challengelen=*((char *)(p+12+sizeof(EAPOL)+sizeof(EAP)));
 //printf("challengelen %d\n",challengelen);
 if((bufmd5=(char *)malloc(1+challengelen+sizeof(pass)))==NULL)
 {
  perror("malloc bufmd5 error");
  close(bpf);
  exit(1);
 }
 /*The Response Value is the one-way hash calculated over a stream of

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TAG标签:	客户端 认证 buf sizeof EAPOL EAP // bpf 回复 if perror