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DHCP Routines

Discover a DHCP server and request boot information. More...

Data Structures
struct	bootp
Defines
#define	DHCP_SERVERPORT   67
#define	DHCP_CLIENTPORT   68
#define	DHCPOPT_PAD   0
#define	DHCPOPT_NETMASK   1
#define	DHCPOPT_GATEWAY   3
#define	DHCPOPT_DNS   6
#define	DHCPOPT_HOSTNAME   12
#define	DHCPOPT_DOMAIN   15
#define	DHCPOPT_BROADCAST   28
#define	DHCPOPT_REQUESTIP   50
#define	DHCPOPT_LEASETIME   51
#define	DHCPOPT_MSGTYPE   53
#define	DHCPOPT_SID   54
#define	DHCPOPT_RENEWALTIME   58
#define	DHCPOPT_REBINDTIME   59
#define	DHCPOPT_END   255
#define	DHCP_DISCOVER   1
#define	DHCP_OFFER   2
#define	DHCP_REQUEST   3
#define	DHCP_DECLINE   4
#define	DHCP_ACK   5
#define	DHCP_NAK   6
#define	DHCP_RELEASE   7
#define	DHCP_INFORM   8
Typedefs
typedef bootp	BOOTPHDR
Functions
u_short	DhcpFrameInit (void)
	Initialize the global send frame for DHCP requests.
u_short	DhcpRequestFrame (void)
u_char	DhcpGetOption (u_char opt, void *ptr, u_char size)
	Retrive the specified DCHP option.
int	DhcpQuery (void)
	Query any DHCP server on the local net.
Variables
u_char	cookie [4] = { 0x63, 0x82, 0x53, 0x63 }

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Detailed Description

Discover a DHCP server and request boot information.

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Function Documentation

u_short DhcpFrameInit (  void    )

Initialize the global send frame for DHCP requests. Returns: Size of the frame. Definition at line 110 of file dhcp.c.

u_char DhcpGetOption (  u_char    opt, void *    ptr, u_char    size )

Retrive the specified DCHP option. Parameters: opt  Option to look for. ptr  Pointer to the buffer that receives the option value. size  Size of the buffer. Returns: Size of the retrieved option value or zero, if the specified option couldn't be found. Definition at line 173 of file dhcp.c.

int DhcpQuery (  void    )

Query any DHCP server on the local net. On success, this routine will fill some global variables: local_ip server_ip bootfile netmask broadcast gateway dns sid Returns: 0 on success, -1 otherwise. Definition at line 217 of file dhcp.c.

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