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struct pcap_rmtauth{　　int    type     //Type of the authentication required.　　char *    username     //Zero-terminated string containing the username that has to be used on the remote machine for authentication.　　char *    password     //Zero-terminated string containing the password that has to be used on the remote machine for authentication. }; 

struct  pcap_if{    pcap_if *    next    //if not NULL, a pointer to the next element in the list; NULL for the last element of the list    char *    name    //a pointer to a string giving a name for the device to pass to pcap_open_live()    char *    description    //if not NULL, a pointer to a string giving a human-readable description of the device    pcap_addr *    addresses    //a pointer to the first element of a list of addresses for the interface    u_int    flags    //PCAP_IF_ interface flags. Currently the only possible flag is PCAP_IF_LOOPBACK, that is set if the interface is a loopback interface.};

struct  pcap_addr{    pcap_addr *    next    //if not NULL, a pointer to the next element in the list; NULL for the last element of the list    sockaddr *    addr    //a pointer to a struct sockaddr containing an address    sockaddr *    netmask    //if not NULL, a pointer to a struct sockaddr that contains the netmask corresponding to the address pointed to by addr.    sockaddr *    broadaddr    //if not NULL, a pointer to a struct sockaddr that contains the broadcast address corre­ sponding to the address pointed to by addr; may be null if the interface doesn‘t support broadcasts    sockaddr *    dstaddr    //if not NULL, a pointer to a struct sockaddr that contains the destination address corre­ sponding to the address pointed to by addr; may be null if the interface isn‘t a point- to-point interface};