while (1) { // 接受回应包 if (recv_ping(sd, source, recv_buf, MAX_PING_PACKET_SIZE) < 0) { // Pull the sequence number out of the ICMP header. If // it's bad, we just complain, but otherwise we take // off, because the read failed for some reason. unsigned short header_len = recv_buf->h_len * 4; ICMPHeader* icmphdr = (ICMPHeader*) ((char*)recv_buf + header_len); if (icmphdr->seq != seq_no) { cerr << "bad sequence number!" << endl; continue; } else { break; } } if (decode_reply(recv_buf, packet_size, &source) != -2) { // Success or fatal error (as opposed to a minor error) // so take off.
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