options.c

ADAM2 sources (modified by Oleg)

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/*  options.c -- DHCP server option packet tools 							   */
/*																			   */
/*-----------------------------------------------------------------------------*/

#include "tinyip.h"

/* supported options are easily added here */
static struct dhcp_option options[] = {
	/* name[10]	flags					code */
	{"subnet",	OPTION_IP | OPTION_REQ,			0x01},
	{"timezone",	OPTION_S32,				0x02},
	{"router",	OPTION_IP | OPTION_LIST | OPTION_REQ,	0x03},
	{"timesvr",	OPTION_IP | OPTION_LIST,		0x04},
	{"namesvr",	OPTION_IP | OPTION_LIST,		0x05},
	{"dns",		OPTION_IP | OPTION_LIST | OPTION_REQ,	0x06},
	{"logsvr",	OPTION_IP | OPTION_LIST,		0x07},
	{"cookiesvr",	OPTION_IP | OPTION_LIST,		0x08},
	{"lprsvr",	OPTION_IP | OPTION_LIST,		0x09},
	{"hostname",	OPTION_STRING | OPTION_REQ,		0x0c},
	{"bootsize",	OPTION_U16,				0x0d},
	{"domain",	OPTION_STRING | OPTION_REQ,		0x0f},
	{"swapsvr",	OPTION_IP,				0x10},
	{"rootpath",	OPTION_STRING,				0x11},
	{"ipttl",	OPTION_U8,				0x17},
	{"mtu",		OPTION_U16,				0x1a},
	{"broadcast",	OPTION_IP | OPTION_REQ,			0x1c},
	{"ntpsrv",	OPTION_IP | OPTION_LIST,		0x2a},
	{"wins",	OPTION_IP | OPTION_LIST,		0x2c},
	{"requestip",	OPTION_IP,				0x32},
	{"lease",	OPTION_U32,				0x33},
	{"dhcptype",	OPTION_U8,				0x35},
	{"serverid",	OPTION_IP,				0x36},
	{"message",	OPTION_STRING,				0x38},
	{"tftp",	OPTION_STRING,				0x42},
	{"bootfile",	OPTION_STRING,				0x43},
	{"",		0x00,				0x00}
};

/* Lengths of the different option types */
static int option_lengths[] = {
	/* NONE*/				0,
	/*[OPTION_IP] */		4,
	/*[OPTION_IP_PAIR] */	8,
	/*[OPTION_BOOLEAN] */	1,
	/*[OPTION_STRING] */	1,
	/*[OPTION_U8] */		1,
	/*[OPTION_U16] */		2,
	/*[OPTION_S16] */		2,
	/*[OPTION_U32] */		4,
	/*[OPTION_S32] */		4
};


/* get an option with bounds checking (warning, not aligned). */
unsigned char *get_option(dhcpMessage *packet, int code)
{
	int i, length;
	unsigned char *optionptr;
	int over = 0, done = 0, curr = OPTION_FIELD;