messageReceived

The messageReceived routine lets you add an external means of authentication to each received DHCP or BOOTP message.

The routine is called just as the message is received by the protocol processor and before any parsing of the message itself.

In addition to the message, the server passes three IP addresses to the routine. These addresses, when used together, can determine whether the client is on a locally attached network or a remotely routed network and whether the server is receiving a broadcast message.

Additionally, you can use the messageReceived routine to alter the received message. Because changes directly affect the remainder of message processing, use this ability rarely and only under well-understood circumstances.

int messageReceived  ( caddr_t hObjectInstance,
                       struct dhcpmessage **inMessage,
                       size_t *messageSize,
                       const struct in_addr *receivingIP,
                       const struct in_addr *destinationIP,
                       const struct in_addr *sourceIP         ) ;