dhcp.h File Reference

#include <stddef.h>
#include <network.h>
#include <dhcpc.h>

Go to the source code of this file.

Data Structures
struct	dhcpPkt

Macros
#define	DHCP_OP_REQUEST   1
#define	DHCP_OP_REPLY   2
#define	DHCP_RETRANSMIT_COUNT   4
#define	DHCP_RETRANSMIT_TIME   5000 /* in ms */
#define	DHCPC_STATE_INIT   0
#define	DHCPC_STATE_SELECTING   1
#define	DHCPC_STATE_REQUESTING   2
#define	DHCPC_STATE_BOUND   3
#define	DHCPC_STATE_RENEW   4
#define	DHCPC_STATE_REBIND   5
#define	DHCPDISCOVER   1
#define	DHCPOFFER   2
#define	DHCPREQUEST   3
#define	DHCPDECLINE   4
#define	DHCPACK   5
#define	DHCPNAK   6
#define	DHCPRELEASE   7
#define	DHCP_TIMEOUT   0
#define	DHCP_HDR_LEN   240
#define	DHCP_OMSGTYPE_LEN   3
#define	DHCP_MAGICCOOKIE   0x63825363
#define	DHCP_HTYPE_ETHER   1
#define	DHCP_BROADCAST   0x8000
#define	DHCP_OPT_END   255
#define	DHCP_OPT_PAD   0
#define	DHCP_OPT_SUBNET   1
#define	DHCP_OPT_GATEWAY   3
#define	DHCP_OPT_DNS   6
#define	DHCP_OPT_HNAME   12
#define	DHCP_OPT_DOMAIN   15
#define	DHCP_OPT_REQUEST   50
#define	DHCP_OPT_LEASE   51
#define	DHCP_OPT_MSGTYPE   53
#define	DHCP_OPT_SERVER   54
#define	DHCP_OPT_PARAMREQ   55
#define	DHCP_TRACE(format,...)

Functions
syscall	dhcpSendRequest (int descrp, struct dhcpData *data)
syscall	dhcpRecvReply (int descrp, struct dhcpData *data, uint timeout)

Function Documentation

syscall dhcpRecvReply	(	int	descrp,
		struct dhcpData *	data,
		uint	timeout
	)

Wait, with timeout, for a response from a DHCP server and update the DHCP transfer data. The exact behavior of this function depends on the current DHCP client state:

• If in DHCPC_STATE_SELECTING, the client waits until it gets a DHCPOFFER reply from any server.
• If in DHCPC_STATE_REQUESTING, the client waits until it gets a DHCPACK or DHCPNAK reply from the server to which it sent the DHCPREQUEST.

Parameters

[in]	descrp	Network device on which to wait for a response.
[in,out]	data	DHCP transfer data.
[in]	timeout	Milliseconds to wait before timing out.

Returns

OK if successful; TIMEOUT if timed out; SYSERR if other error occurred.

syscall dhcpSendRequest	(	int	descrp,
		struct dhcpData *	data
	)

Send a DHCPDISCOVER or DHCPREQUEST packet, depending on the current state of the DHCP client (DHCPC_STATE_INIT or DHCPC_STATE_SELECTING, respectively).

Parameters

[in]	descrp	Network device on which to send the DHCP packet.
[in,out]	data	DHCP transfer data that has been filled in appropriately for DHCPC_STATE_INIT or DHCPC_STATE_SELECTING.

Returns

OK if packet was successfully sent; SYSERR otherwise.