3.1.7.5 Safe Raw Sockets - ICMP Sockets

• To send and receive ICMP messages that are not associated with a specific TCP/UDP port number, the socket has to be bound to a specific ICMP identifier.
  • struct sockaddr_in sin;
    sock = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
    memset(& sin, 0, sizeof(sin));
    sin.sin_port = htons(23456);
    bind(sock, (struct sockaddr *)& sin, sizeof(sin);