DhcpMessage¶

//
// Represents a DHCP message. DHCP (Dynamic Host Configuration Protocol, RFC 2131)
// provides a framework for passing configuration information to hosts on a TCP/IP network.
//
// @see DhcpClient, DhcpServer
//
class DhcpMessage extends FieldsChunk
{
    DhcpOpcode op; // message op code / message type. 1 = BOOTREQUEST, 2 = BOOTREPLY
    int htype; // hardware address type, see Arp section in "Assigned Numbers" RFC; e.g., '1' = 10mb ethernet
    int hlen; // hardware address length (e.g.  '6' for 10mb ethernet)
    int hops; // client sets to zero, optionally used by relay agents when booting via a relay agent
    unsigned int xid; // transaction ID, a random number chosen by the client, used by the client and server to associate messages and responses between a client and a server
    int secs; // filled in by client, seconds elapsed since client began address acquisition or renewal process
    bool broadcast; // the broadcast bit in the flags field
    uint16_t reserved = 0; // MUST BE ZERO (reserved for future use)
    Ipv4Address ciaddr; // client IP address; only filled in if client is in BOUND, RENEW or REBINDING state and can respond to Arp requests
    Ipv4Address yiaddr; // 'your' (client) IP address
    Ipv4Address giaddr; // relay agent IP address, used in booting via a relay agent
    MacAddress chaddr; // client hardware address (MAC)
    string sname; // optional server host name
    string file; // boot file name (unused in the simulation)
    DhcpOptions options; // holds DHCP options
}