给FreeBSD写了个802.1X认证客户端

      octets consisting of the Identifier, followed by (concatenated
      with) the "secret", followed by (concatenated with) the Challenge
      Value.  The length of the Response Value depends upon the hash
      algorithm used (16 octets for MD5).见RFC1994*/
 memset(bufmd5,0,1+challengelen+sizeof(pass));
 *bufmd5=id;
 memcpy(bufmd5+1,pass,sizeof(pass));
 memcpy(bufmd5+1+sizeof(pass),p+12+sizeof(EAPOL)+sizeof(EAP)+1,challengelen);
 MD5Init(&context);//计算md5值
 MD5Update(&context, bufmd5, 1+challengelen+sizeof(pass));
 MD5Final(md5Hash, &context);
 //构造EAP Response MD5-Challenge帧
 printf("send EAP Response MD5-Challenge 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)+challengelen+1);//这里的1是EAP里的value-size
 ((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)+challengelen+1);
 ((EAP *)(buf+12+sizeof(EAPOL)))->;type=EAP_TYPE_MD5Challenge;
 *(char *)(buf+12+sizeof(EAPOL)+sizeof(EAP))=16;//md5 hash长度
 memcpy(buf+12+sizeof(EAPOL)+sizeof(EAP)+1,md5Hash,16);
 memcpy(buf+12+sizeof(EAPOL)+sizeof(EAP)+1+16,name,sizeof(name));
 memcpy(buf+12+sizeof(EAPOL)+sizeof(EAP)+1+16+sizeof(name),pad,sizeof(pad));
 if(1000!=write(bpf,buf,1000))
 //发送EAP Response MD5-Challenge帧
 {
  perror("write EAP Response MD5-Challenge error");
  goto retry;
 }
 //读取EAP success或fail帧
 FD_ZERO(&readset);
 FD_SET(bpf, &readset);
 ioctl(bpf,BIOCFLUSH);
 if(1!=select(bpf+1,&readset,NULL,NULL,&timeout))
 {
  perror("select read EAP authentication result");
  goto retry;
 }
 if(-1==read(bpf,buf,blen))
 {
  perror("read EAP authentication result errorr");
  goto retry;
 }
 p=buf+((struct bpf_hdr *)buf)->;bh_hdrlen;
 if((((EAPOL *)(p+12))->;type!=EAPOL_Packet)||(((EAP *)(p+12+sizeof(EAPOL)))->;id!=id))
 {
  printf("EAP result packet error!\n");
  goto retry;

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