added full udhcp integration

1 files changed, 0 insertions, 1587 deletions

diff --git a/networking/udhcpc.c b/networking/udhcpc.c
deleted file mode 100644
index c05ca4557..000000000
--- a/networking/udhcpc.c
+++ /dev/null
@@ -1,1587 +0,0 @@
-/* dhcpd.c
- *
- * udhcp DHCP client
- *
- * Russ Dill <Russ.Dill@asu.edu> July 2001
- * 
- * Converted to busybox by Glenn McGrath August 2002
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <stdio.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/file.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <stdlib.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <signal.h>
-#include <time.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <errno.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
-#include <netpacket/packet.h>
-#include <net/ethernet.h>
-#else
-#include <asm/types.h>
-#include <linux/if_packet.h>
-#include <linux/if_ether.h>
-#endif
-#include "libbb.h"
-
-static int state;
-static unsigned long requested_ip;	/* = 0 */
-static unsigned long server_addr;
-static unsigned long timeout;
-static int packet_num;	/* = 0 */
-static int fd_main;
-
-/* #define DEBUG */
-
-#define VERSION "0.9.7"
-
-#define LISTEN_NONE 0
-#define LISTEN_KERNEL 1
-#define LISTEN_RAW 2
-static int listen_mode;
-
-#define DEFAULT_SCRIPT	"/usr/share/udhcpc/default.script"
-
-#define DHCP_END		0xFF
-#define TYPE_MASK	0x0F
-#define BROADCAST_FLAG		0x8000
-
-#define SERVER_PORT		67
-
-#define DHCP_MAGIC		0x63825363
-
-#define BOOTREQUEST		1
-#define BOOTREPLY		2
-
-#define ETH_10MB		1
-#define ETH_10MB_LEN		6
-
-#define OPTION_FIELD		0
-#define FILE_FIELD		1
-#define SNAME_FIELD		2
-
-#define INIT_SELECTING	0
-#define REQUESTING	1
-#define BOUND		2
-#define RENEWING	3
-#define REBINDING	4
-#define INIT_REBOOT	5
-#define RENEW_REQUESTED 6
-#define RELEASED	7
-
-#define CLIENT_PORT		68
-
-#define DHCPDISCOVER		1
-#define DHCPOFFER		2
-#define DHCPREQUEST		3
-#define DHCPDECLINE		4
-#define DHCPACK			5
-#define DHCPNAK			6
-#define DHCPRELEASE		7
-#define DHCPINFORM		8
-
-/* DHCP option codes (partial list) */
-#define DHCP_PADDING		0x00
-#define DHCP_SUBNET		0x01
-#define DHCP_TIME_OFFSET	0x02
-#define DHCP_ROUTER		0x03
-#define DHCP_TIME_SERVER	0x04
-#define DHCP_NAME_SERVER	0x05
-#define DHCP_DNS_SERVER		0x06
-#define DHCP_LOG_SERVER		0x07
-#define DHCP_COOKIE_SERVER	0x08
-#define DHCP_LPR_SERVER		0x09
-#define DHCP_HOST_NAME		0x0c
-#define DHCP_BOOT_SIZE		0x0d
-#define DHCP_DOMAIN_NAME	0x0f
-#define DHCP_SWAP_SERVER	0x10
-#define DHCP_ROOT_PATH		0x11
-#define DHCP_IP_TTL		0x17
-#define DHCP_MTU		0x1a
-#define DHCP_BROADCAST		0x1c
-#define DHCP_NTP_SERVER		0x2a
-#define DHCP_WINS_SERVER	0x2c
-#define DHCP_REQUESTED_IP	0x32
-#define DHCP_LEASE_TIME		0x33
-#define DHCP_OPTION_OVER	0x34
-#define DHCP_MESSAGE_TYPE	0x35
-#define DHCP_SERVER_ID		0x36
-#define DHCP_PARAM_REQ		0x37
-#define DHCP_MESSAGE		0x38
-#define DHCP_MAX_SIZE		0x39
-#define DHCP_T1			0x3a
-#define DHCP_T2			0x3b
-#define DHCP_VENDOR		0x3c
-#define DHCP_CLIENT_ID		0x3d
-
-/* miscellaneous defines */
-#define MAC_BCAST_ADDR		(unsigned char *) "\xff\xff\xff\xff\xff\xff"
-#define OPT_CODE 0
-#define OPT_LEN 1
-#define OPT_DATA 2
-
-enum {
-	OPTION_IP = 1,
-	OPTION_IP_PAIR,
-	OPTION_STRING,
-	OPTION_BOOLEAN,
-	OPTION_U8,
-	OPTION_U16,
-	OPTION_S16,
-	OPTION_U32,
-	OPTION_S32
-};
-
-#define OPTION_REQ	0x10	/* have the client request this option */
-#define OPTION_LIST	0x20	/* There can be a list of 1 or more of these */
-
-#ifdef SYSLOG
-# define LOG(level, str, args...) do { printf(str, ## args); \
-				printf("\n"); \
-				syslog(level, str, ## args); } while(0)
-# define OPEN_LOG(name) openlog(name, 0, 0)
-# define CLOSE_LOG() closelog()
-#else
-# define LOG_EMERG	"EMERGENCY!"
-# define LOG_ALERT	"ALERT!"
-# define LOG_CRIT	"critical!"
-# define LOG_WARNING	"warning"
-# define LOG_ERR	"error"
-# define LOG_INFO	"info"
-# define LOG_DEBUG	"debug"
-# define LOG(level, str, args...) do { printf("%s, " str "\n", level, ## args); } while(0)
-# define OPEN_LOG(name)
-# define CLOSE_LOG()
-#endif
-
-#ifdef DEBUG
-# undef DEBUG
-# define DEBUG(level, str, args...) LOG(level, str, ## args)
-# define DEBUGGING
-#else
-# define DEBUG(level, str, args...)
-#endif
-
-struct dhcpMessage {
-	u_int8_t op;
-	u_int8_t htype;
-	u_int8_t hlen;
-	u_int8_t hops;
-	u_int32_t xid;
-	u_int16_t secs;
-	u_int16_t flags;
-	u_int32_t ciaddr;
-	u_int32_t yiaddr;
-	u_int32_t siaddr;
-	u_int32_t giaddr;
-	u_int8_t chaddr[16];
-	u_int8_t sname[64];
-	u_int8_t file[128];
-	u_int32_t cookie;
-	u_int8_t options[308];	/* 312 - cookie */
-};
-
-struct client_config_t {
-	char foreground;	/* Do not fork */
-	char quit_after_lease;	/* Quit after obtaining lease */
-	char abort_if_no_lease;	/* Abort if no lease */
-	char *interface;	/* The name of the interface to use */
-	char *pidfile;		/* Optionally store the process ID */
-	char *script;		/* User script to run at dhcp events */
-	unsigned char *clientid;	/* Optional client id to use */
-	unsigned char *hostname;	/* Optional hostname to use */
-	int ifindex;		/* Index number of the interface to use */
-	unsigned char arp[6];	/* Our arp address */
-};
-
-struct client_config_t client_config = {
-	/* Default options. */
-	abort_if_no_lease:0,
-	foreground:0,
-	quit_after_lease:0,
-	interface:"eth0",
-	pidfile:NULL,
-	script:DEFAULT_SCRIPT,
-	clientid:NULL,
-	hostname:NULL,
-	ifindex:0,
-	arp:"\0\0\0\0\0\0",	/* appease gcc-3.0 */
-};
-
-struct dhcp_option {
-	char name[10];
-	char flags;
-	unsigned char code;
-};
-
-struct udp_dhcp_packet {
-	struct iphdr ip;
-	struct udphdr udp;
-	struct dhcpMessage data;
-};
-
-static const 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 const unsigned char option_lengths[] = {
-	[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 a rough idea of how long an option will be (rounding up...) */
-static const unsigned char max_option_length[] = {
-	[OPTION_IP] = sizeof("255.255.255.255 "),
-	[OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
-	[OPTION_STRING] = 1,
-	[OPTION_BOOLEAN] = sizeof("yes "),
-	[OPTION_U8] = sizeof("255 "),
-	[OPTION_U16] = sizeof("65535 "),
-	[OPTION_S16] = sizeof("-32768 "),
-	[OPTION_U32] = sizeof("4294967295 "),
-	[OPTION_S32] = sizeof("-2147483684 "),
-};
-
-/* return the position of the 'end' option (no bounds checking) */
-static int end_option(unsigned char *optionptr)
-{
-	int i = 0;
-
-	while (optionptr[i] != DHCP_END) {
-		if (optionptr[i] == DHCP_PADDING)
-			i++;
-		else
-			i += optionptr[i + OPT_LEN] + 2;
-	}
-	return i;
-}
-
-/* add an option string to the options (an option string contains an option code,
- * length, then data) */
-static int add_option_string(unsigned char *optionptr, unsigned char *string)
-{
-	int end = end_option(optionptr);
-
-	/* end position + string length + option code/length + end option */
-	if (end + string[OPT_LEN] + 2 + 1 >= 308) {
-		LOG(LOG_ERR, "Option 0x%02x did not fit into the packet!",
-			string[OPT_CODE]);
-		return 0;
-	}
-	DEBUG(LOG_INFO, "adding option 0x%02x", string[OPT_CODE]);
-	memcpy(optionptr + end, string, string[OPT_LEN] + 2);
-	optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
-	return string[OPT_LEN] + 2;
-}
-
-/* add a one to four byte option to a packet */
-static int add_simple_option(unsigned char *optionptr, unsigned char code,
-							 u_int32_t data)
-{
-	char length = 0;
-	int i;
-	unsigned char option[2 + 4];
-	unsigned char *u8;
-	u_int16_t *u16;
-	u_int32_t *u32;
-	u_int32_t aligned;
-
-	u8 = (unsigned char *) &aligned;
-	u16 = (u_int16_t *) & aligned;
-	u32 = &aligned;
-
-	for (i = 0; options[i].code; i++)
-		if (options[i].code == code) {
-			length = option_lengths[options[i].flags & TYPE_MASK];
-		}
-
-	if (!length) {
-		DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
-		return 0;
-	}
-
-	option[OPT_CODE] = code;
-	option[OPT_LEN] = length;
-
-	switch (length) {
-	case 1:
-		*u8 = data;
-		break;
-	case 2:
-		*u16 = data;
-		break;
-	case 4:
-		*u32 = data;
-		break;
-	}
-
-	memcpy(option + 2, &aligned, length);
-	return add_option_string(optionptr, option);
-}
-
-static u_int16_t checksum(void *addr, int count)
-{
-	/* Compute Internet Checksum for "count" bytes
-	 *         beginning at location "addr".
-	 */
-	register int32_t sum = 0;
-	u_int16_t *source = (u_int16_t *) addr;
-
-	while (count > 1) {
-		/*  This is the inner loop */
-		sum += *source++;
-		count -= 2;
-	}
-
-	/*  Add left-over byte, if any */
-	if (count > 0) {
-		sum += *(unsigned char *) source;
-	}
-
-	/*  Fold 32-bit sum to 16 bits */
-	while (sum >> 16) {
-		sum = (sum & 0xffff) + (sum >> 16);
-	}
-
-	return ~sum;
-}
-
-/* Constuct a ip/udp header for a packet, and specify the source and dest hardware address */
-static int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip,
-					  int source_port, u_int32_t dest_ip, int dest_port,
-					  unsigned char *dest_arp, int ifindex)
-{
-	int l_fd;
-	int result;
-	struct sockaddr_ll dest;
-	struct udp_dhcp_packet packet;
-
-	if ((l_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
-		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
-		return -1;
-	}
-
-	memset(&dest, 0, sizeof(dest));
-	memset(&packet, 0, sizeof(packet));
-
-	dest.sll_family = AF_PACKET;
-	dest.sll_protocol = htons(ETH_P_IP);
-	dest.sll_ifindex = ifindex;
-	dest.sll_halen = 6;
-	memcpy(dest.sll_addr, dest_arp, 6);
-	if (bind(l_fd, (struct sockaddr *) &dest, sizeof(struct sockaddr_ll)) < 0) {
-		DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
-		close(l_fd);
-		return -1;
-	}
-
-	packet.ip.protocol = IPPROTO_UDP;
-	packet.ip.saddr = source_ip;
-	packet.ip.daddr = dest_ip;
-	packet.udp.source = htons(source_port);
-	packet.udp.dest = htons(dest_port);
-	packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage));	/* cheat on the psuedo-header */
-	packet.ip.tot_len = packet.udp.len;
-	memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
-	packet.udp.check = checksum(&packet, sizeof(struct udp_dhcp_packet));
-
-	packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
-	packet.ip.ihl = sizeof(packet.ip) >> 2;
-	packet.ip.version = IPVERSION;
-	packet.ip.ttl = IPDEFTTL;
-	packet.ip.check = checksum(&(packet.ip), sizeof(packet.ip));
-
-	result =
-		sendto(l_fd, &packet, sizeof(struct udp_dhcp_packet), 0,
-			   (struct sockaddr *) &dest, sizeof(dest));
-	if (result <= 0) {
-		DEBUG(LOG_ERR, "write on socket failed: %s", strerror(errno));
-	}
-	close(l_fd);
-	return result;
-}
-
-/* Let the kernel do all the work for packet generation */
-static int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip,
-						 int source_port, u_int32_t dest_ip, int dest_port)
-{
-	int n = 1;
-	int l_fd, result;
-	struct sockaddr_in client;
-
-	if ((l_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
-		return -1;
-	}
-
-	if (setsockopt(l_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) ==
-		-1) {
-		return -1;
-	}
-
-	memset(&client, 0, sizeof(client));
-	client.sin_family = AF_INET;
-	client.sin_port = htons(source_port);
-	client.sin_addr.s_addr = source_ip;
-
-	if (bind(l_fd, (struct sockaddr *) &client, sizeof(struct sockaddr)) ==
-		-1) {
-		return -1;
-	}
-
-	memset(&client, 0, sizeof(client));
-	client.sin_family = AF_INET;
-	client.sin_port = htons(dest_port);
-	client.sin_addr.s_addr = dest_ip;
-
-	if (connect(l_fd, (struct sockaddr *) &client, sizeof(struct sockaddr)) ==
-		-1) {
-		return -1;
-	}
-
-	result = write(l_fd, payload, sizeof(struct dhcpMessage));
-	close(l_fd);
-	return result;
-}
-
-/* initialize a packet with the proper defaults */
-static void init_packet(struct dhcpMessage *packet, char type)
-{
-	struct vendor {
-		char vendor, length;
-		char str[sizeof("udhcp " VERSION)];
-	}
-	vendor_id = {
-	DHCP_VENDOR, sizeof("udhcp " VERSION) - 1, "udhcp " VERSION};
-
-	memset(packet, 0, sizeof(struct dhcpMessage));
-	switch (type) {
-	case DHCPDISCOVER:
-	case DHCPREQUEST:
-	case DHCPRELEASE:
-	case DHCPINFORM:
-		packet->op = BOOTREQUEST;
-		break;
-	case DHCPOFFER:
-	case DHCPACK:
-	case DHCPNAK:
-		packet->op = BOOTREPLY;
-	}
-	packet->htype = ETH_10MB;
-	packet->hlen = ETH_10MB_LEN;
-	packet->cookie = htonl(DHCP_MAGIC);
-	packet->options[0] = DHCP_END;
-	add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
-
-	memcpy(packet->chaddr, client_config.arp, 6);
-	add_option_string(packet->options, client_config.clientid);
-	if (client_config.hostname) {
-		add_option_string(packet->options, client_config.hostname);
-	}
-	add_option_string(packet->options, (unsigned char *) &vendor_id);
-}
-
-
-/* Add a paramater request list for stubborn DHCP servers. Pull the data
- * from the struct in options.c. Don't do bounds checking here because it
- * goes towards the head of the packet. */
-static void add_requests(struct dhcpMessage *packet)
-{
-	int end = end_option(packet->options);
-	int i, len = 0;
-
-	packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
-	for (i = 0; options[i].code; i++) {
-		if (options[i].flags & OPTION_REQ) {
-			packet->options[end + OPT_DATA + len++] = options[i].code;
-		}
-	}
-	packet->options[end + OPT_LEN] = len;
-	packet->options[end + OPT_DATA + len] = DHCP_END;
-
-}
-
-/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
-static inline int send_discover(unsigned long xid, unsigned long requested)
-{
-	struct dhcpMessage packet;
-
-	init_packet(&packet, DHCPDISCOVER);
-	packet.xid = xid;
-	if (requested) {
-		add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	}
-	add_requests(&packet);
-	DEBUG(LOG_DEBUG, "Sending discover...");
-	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-					  SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-/* Broadcasts a DHCP request message */
-static inline int send_selecting(unsigned long xid, unsigned long server,
-								 unsigned long requested)
-{
-	struct dhcpMessage packet;
-	struct in_addr addr;
-
-	init_packet(&packet, DHCPREQUEST);
-	packet.xid = xid;
-
-	add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	add_simple_option(packet.options, DHCP_SERVER_ID, server);
-
-	add_requests(&packet);
-	addr.s_addr = requested;
-	DEBUG(LOG_DEBUG, "Sending select for %s...", inet_ntoa(addr));
-	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-					  SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-
-/* Unicasts or broadcasts a DHCP renew message */
-static int send_renew(unsigned long xid, unsigned long server,
-					  unsigned long ciaddr)
-{
-	struct dhcpMessage packet;
-
-	init_packet(&packet, DHCPREQUEST);
-	packet.xid = xid;
-	packet.ciaddr = ciaddr;
-
-	add_requests(&packet);
-	DEBUG(LOG_DEBUG, "Sending renew...");
-	if (server) {
-		return kernel_packet(&packet, ciaddr, CLIENT_PORT, server,
-							 SERVER_PORT);
-	}
-	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-					  SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-/* Create a random xid */
-static unsigned long random_xid(void)
-{
-	static int initialized;
-
-	if (!initialized) {
-		srand(time(0));
-		initialized++;
-	}
-	return rand();
-}
-
-/* just a little helper */
-static void change_mode(int new_mode)
-{
-	DEBUG(LOG_INFO, "entering %s listen mode",
-		  new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
-	close(fd_main);
-	fd_main = -1;
-	listen_mode = new_mode;
-}
-
-
-/* SIGUSR1 handler (renew) */
-static void renew_requested(int sig)
-{
-	sig = 0;
-	LOG(LOG_INFO, "Received SIGUSR1");
-	if (state == BOUND || state == RENEWING || state == REBINDING ||
-		state == RELEASED) {
-		change_mode(LISTEN_KERNEL);
-		packet_num = 0;
-		state = RENEW_REQUESTED;
-	}
-
-	if (state == RELEASED) {
-		change_mode(LISTEN_RAW);
-		state = INIT_SELECTING;
-	}
-
-	/* Kill any timeouts because the user wants this to hurry along */
-	timeout = 0;
-}
-
-/* get an option with bounds checking (warning, not aligned). */
-static unsigned char *get_option(struct dhcpMessage *packet, int code)
-{
-	int i, length;
-	unsigned char *optionptr;
-	int over = 0, done = 0, curr = OPTION_FIELD;
-
-	optionptr = packet->options;
-	i = 0;
-	length = 308;
-	while (!done) {
-		if (i >= length) {
-			LOG(LOG_WARNING, "bogus packet, option fields too long.");
-			return NULL;
-		}
-		if (optionptr[i + OPT_CODE] == code) {
-			if (i + 1 + optionptr[i + OPT_LEN] >= length) {
-				LOG(LOG_WARNING, "bogus packet, option fields too long.");
-				return NULL;
-			}
-			return optionptr + i + 2;
-		}
-		switch (optionptr[i + OPT_CODE]) {
-		case DHCP_PADDING:
-			i++;
-			break;
-		case DHCP_OPTION_OVER:
-			if (i + 1 + optionptr[i + OPT_LEN] >= length) {
-				LOG(LOG_WARNING, "bogus packet, option fields too long.");
-				return NULL;
-			}
-			over = optionptr[i + 3];
-			i += optionptr[OPT_LEN] + 2;
-			break;
-		case DHCP_END:
-			if (curr == OPTION_FIELD && over & FILE_FIELD) {
-				optionptr = packet->file;
-				i = 0;
-				length = 128;
-				curr = FILE_FIELD;
-			} else if (curr == FILE_FIELD && over & SNAME_FIELD) {
-				optionptr = packet->sname;
-				i = 0;
-				length = 64;
-				curr = SNAME_FIELD;
-			} else {
-				done = 1;
-			}
-			break;
-		default:
-			i += optionptr[OPT_LEN + i] + 2;
-		}
-	}
-	return NULL;
-}
-
-static int sprintip(char *dest, char *pre, unsigned char *ip)
-{
-	return sprintf(dest, "%s%d.%d.%d.%d ", pre, ip[0], ip[1], ip[2], ip[3]);
-}
-
-
-/* Fill dest with the text of option 'option'. */
-static inline void fill_options(char *dest, unsigned char *option,
-								const struct dhcp_option *type_p)
-{
-	int type, optlen;
-	u_int16_t val_u16;
-	int16_t val_s16;
-	u_int32_t val_u32;
-	int32_t val_s32;
-	int len = option[OPT_LEN - 2];
-
-	dest += sprintf(dest, "%s=", type_p->name);
-
-	type = type_p->flags & TYPE_MASK;
-	optlen = option_lengths[type];
-	for (;;) {
-		switch (type) {
-		case OPTION_IP_PAIR:
-			dest += sprintip(dest, "", option);
-			*(dest++) = '/';
-			option += 4;
-			optlen = 4;
-		case OPTION_IP:	/* Works regardless of host byte order. */
-			dest += sprintip(dest, "", option);
-			break;
-		case OPTION_BOOLEAN:
-			dest += sprintf(dest, *option ? "yes " : "no ");
-			break;
-		case OPTION_U8:
-			dest += sprintf(dest, "%u ", *option);
-			break;
-		case OPTION_U16:
-			memcpy(&val_u16, option, 2);
-			dest += sprintf(dest, "%u ", ntohs(val_u16));
-			break;
-		case OPTION_S16:
-			memcpy(&val_s16, option, 2);
-			dest += sprintf(dest, "%d ", ntohs(val_s16));
-			break;
-		case OPTION_U32:
-			memcpy(&val_u32, option, 4);
-			dest += sprintf(dest, "%lu ", (unsigned long) ntohl(val_u32));
-			break;
-		case OPTION_S32:
-			memcpy(&val_s32, option, 4);
-			dest += sprintf(dest, "%ld ", (long) ntohl(val_s32));
-			break;
-		case OPTION_STRING:
-			memcpy(dest, option, len);
-			dest[len] = '\0';
-			return;		/* Short circuit this case */
-		}
-		option += optlen;
-		len -= optlen;
-		if (len <= 0) {
-			break;
-		}
-	}
-}
-
-static char *find_env(const char *prefix, char *defaultstr)
-{
-	extern char **environ;
-	char **ptr;
-	const int len = strlen(prefix);
-
-	for (ptr = environ; *ptr != NULL; ptr++) {
-		if (strncmp(prefix, *ptr, len) == 0) {
-			return *ptr;
-		}
-	}
-	return defaultstr;
-}
-
-/* put all the paramaters into an environment */
-static char **fill_envp(struct dhcpMessage *packet)
-{
-	/* supported options are easily added here */
-	int num_options = 0;
-	int i, j;
-	char **envp;
-	unsigned char *temp;
-	char over = 0;
-
-	if (packet == NULL) {
-		num_options = 0;
-	} else {
-		for (i = 0; options[i].code; i++) {
-			if (get_option(packet, options[i].code)) {
-				num_options++;
-			}
-		}
-		if (packet->siaddr) {
-			num_options++;
-		}
-		if ((temp = get_option(packet, DHCP_OPTION_OVER))) {
-			over = *temp;
-		}
-		if (!(over & FILE_FIELD) && packet->file[0]) {
-			num_options++;
-		}
-		if (!(over & SNAME_FIELD) && packet->sname[0]) {
-			num_options++;
-		}
-	}
-
-	envp = xmalloc((num_options + 5) * sizeof(char *));
-	envp[0] = xmalloc(sizeof("interface=") + strlen(client_config.interface));
-	sprintf(envp[0], "interface=%s", client_config.interface);
-	envp[1] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin");
-	envp[2] = find_env("HOME", "HOME=/");
-
-	if (packet == NULL) {
-		envp[3] = NULL;
-		return envp;
-	}
-
-	envp[3] = xmalloc(sizeof("ip=255.255.255.255"));
-	sprintip(envp[3], "ip=", (unsigned char *) &packet->yiaddr);
-	for (i = 0, j = 4; options[i].code; i++) {
-		if ((temp = get_option(packet, options[i].code))) {
-			envp[j] =
-				xmalloc(max_option_length[(&options[i])->flags & TYPE_MASK] *
-						(temp[OPT_LEN - 2] /
-						 option_lengths[(&options[i])->flags & TYPE_MASK]) +
-						strlen((&options[i])->name) + 2);
-			fill_options(envp[j], temp, &options[i]);
-			j++;
-		}
-	}
-	if (packet->siaddr) {
-		envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
-		sprintip(envp[j++], "siaddr=", (unsigned char *) &packet->yiaddr);
-	}
-	if (!(over & FILE_FIELD) && packet->file[0]) {
-		/* watch out for invalid packets */
-		packet->file[sizeof(packet->file) - 1] = '\0';
-		envp[j] = xmalloc(sizeof("boot_file=") + strlen(packet->file));
-		sprintf(envp[j++], "boot_file=%s", packet->file);
-	}
-	if (!(over & SNAME_FIELD) && packet->sname[0]) {
-		/* watch out for invalid packets */
-		packet->sname[sizeof(packet->sname) - 1] = '\0';
-		envp[j] = xmalloc(sizeof("sname=") + strlen(packet->sname));
-		sprintf(envp[j++], "sname=%s", packet->sname);
-	}
-	envp[j] = NULL;
-	return envp;
-}
-
-/* Call a script with a par file and env vars */
-static void run_script(struct dhcpMessage *packet, const char *name)
-{
-	int pid;
-	char **envp;
-
-	if (client_config.script == NULL) {
-		return;
-	}
-
-	/* call script */
-	pid = fork();
-	if (pid) {
-		waitpid(pid, NULL, 0);
-		return;
-	} else if (pid == 0) {
-		envp = fill_envp(packet);
-
-		/* close fd's? */
-
-		/* exec script */
-		DEBUG(LOG_INFO, "execle'ing %s", client_config.script);
-		execle(client_config.script, client_config.script, name, NULL, envp);
-		LOG(LOG_ERR, "script %s failed: %s",
-			client_config.script, strerror(errno));
-		exit(1);
-	}
-}
-
-/* SIGUSR2 handler (release) */
-static void release_requested(int sig)
-{
-	sig = 0;
-	LOG(LOG_INFO, "Received SIGUSR2");
-	/* send release packet */
-	if (state == BOUND || state == RENEWING || state == REBINDING) {
-		struct dhcpMessage packet;
-
-		init_packet(&packet, DHCPRELEASE);
-		packet.xid = random_xid();
-		packet.ciaddr = requested_ip;
-
-		add_simple_option(packet.options, DHCP_REQUESTED_IP, requested_ip);
-		add_simple_option(packet.options, DHCP_SERVER_ID, server_addr);
-
-		DEBUG(LOG_DEBUG, "Sending release...");
-		kernel_packet(&packet, requested_ip, CLIENT_PORT, server_addr,
-					  SERVER_PORT);
-		run_script(NULL, "deconfig");
-	}
-
-	change_mode(LISTEN_NONE);
-	state = RELEASED;
-	timeout = 0x7fffffff;
-}
-
-
-static int pidfile_acquire(char *pidfile)
-{
-	int pid_fd;
-
-	if (pidfile == NULL) {
-		return -1;
-	}
-	pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
-	if (pid_fd < 0) {
-		LOG(LOG_ERR, "Unable to open pidfile %s: %s\n",
-			pidfile, strerror(errno));
-	} else {
-		lockf(pid_fd, F_LOCK, 0);
-	}
-
-	return pid_fd;
-}
-
-
-static void pidfile_write_release(int pid_fd)
-{
-	FILE *out;
-
-	if (pid_fd < 0) {
-		return;
-	}
-	if ((out = fdopen(pid_fd, "w")) != NULL) {
-		fprintf(out, "%d\n", getpid());
-		fclose(out);
-	}
-	lockf(pid_fd, F_UNLCK, 0);
-	close(pid_fd);
-}
-
-/* Exit and cleanup */
-static void exit_client(int retval)
-{
-	unlink(client_config.pidfile);
-	if (client_config.pidfile) {
-		unlink(client_config.pidfile);
-	}
-	CLOSE_LOG();
-	exit(retval);
-}
-
-
-/* SIGTERM handler */
-static void terminate(int sig)
-{
-	sig = 0;
-	LOG(LOG_INFO, "Received SIGTERM");
-	exit_client(0);
-}
-
-
-static inline int read_interface(char *interface, int *ifindex,
-								 u_int32_t * addr, unsigned char *arp)
-{
-	int l_fd;
-	struct ifreq ifr;
-	struct sockaddr_in *s_in;
-
-	memset(&ifr, 0, sizeof(struct ifreq));
-	if ((l_fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
-		ifr.ifr_addr.sa_family = AF_INET;
-		strcpy(ifr.ifr_name, interface);
-
-		if (addr) {
-			if (ioctl(l_fd, SIOCGIFADDR, &ifr) == 0) {
-				s_in = (struct sockaddr_in *) &ifr.ifr_addr;
-				*addr = s_in->sin_addr.s_addr;
-				DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name,
-					  inet_ntoa(s_in->sin_addr));
-			} else {
-				LOG(LOG_ERR, "SIOCGIFADDR failed!: %s", strerror(errno));
-				return -1;
-			}
-		}
-
-		if (ioctl(l_fd, SIOCGIFINDEX, &ifr) == 0) {
-			DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
-			*ifindex = ifr.ifr_ifindex;
-		} else {
-			LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno));
-			return -1;
-		}
-		if (ioctl(l_fd, SIOCGIFHWADDR, &ifr) == 0) {
-			memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
-			DEBUG(LOG_INFO,
-				  "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
-				  arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
-		} else {
-			LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno));
-			return -1;
-		}
-	} else {
-		LOG(LOG_ERR, "socket failed!: %s", strerror(errno));
-		return -1;
-	}
-	close(l_fd);
-	return 0;
-}
-
-
-static inline int listen_socket(unsigned int ip, int port, char *inf)
-{
-	struct ifreq interface;
-	int l_fd;
-	struct sockaddr_in addr;
-	int n = 1;
-
-	DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf);
-	if ((l_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
-		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
-		return -1;
-	}
-
-	memset(&addr, 0, sizeof(addr));
-	addr.sin_family = AF_INET;
-	addr.sin_port = htons(port);
-	addr.sin_addr.s_addr = ip;
-
-	if (setsockopt(l_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) ==
-		-1) {
-		close(l_fd);
-		return -1;
-	}
-	if (setsockopt(l_fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) ==
-		-1) {
-		close(l_fd);
-		return -1;
-	}
-
-	strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
-	if (setsockopt
-		(l_fd, SOL_SOCKET, SO_BINDTODEVICE, (char *) &interface,
-		 sizeof(interface)) < 0) {
-		close(l_fd);
-		return -1;
-	}
-
-	if (bind(l_fd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) == -1) {
-		close(l_fd);
-		return -1;
-	}
-
-	return l_fd;
-}
-
-
-static int raw_socket(int ifindex)
-{
-	int l_fd;
-	struct sockaddr_ll sock;
-
-	DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex);
-	if ((l_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
-		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
-		return -1;
-	}
-
-	sock.sll_family = AF_PACKET;
-	sock.sll_protocol = htons(ETH_P_IP);
-	sock.sll_ifindex = ifindex;
-	if (bind(l_fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
-		DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
-		close(l_fd);
-		return -1;
-	}
-
-	return l_fd;
-
-}
-
-/* read a packet from socket fd, return -1 on read error, -2 on packet error */
-static int get_packet(struct dhcpMessage *packet, int l_fd)
-{
-	int bytes;
-	int i;
-	const char broken_vendors[][8] = {
-		"MSFT 98",
-		""
-	};
-	char unsigned *vendor;
-
-	memset(packet, 0, sizeof(struct dhcpMessage));
-	bytes = read(l_fd, packet, sizeof(struct dhcpMessage));
-	if (bytes < 0) {
-		DEBUG(LOG_INFO, "couldn't read on listening socket, ignoring");
-		return -1;
-	}
-
-	if (ntohl(packet->cookie) != DHCP_MAGIC) {
-		LOG(LOG_ERR, "received bogus message, ignoring");
-		return -2;
-	}
-	DEBUG(LOG_INFO, "Received a packet");
-
-	if (packet->op == BOOTREQUEST
-		&& (vendor = get_option(packet, DHCP_VENDOR))) {
-		for (i = 0; broken_vendors[i][0]; i++) {
-			if (vendor[OPT_LEN - 2] ==
-				(unsigned char) strlen(broken_vendors[i])
-				&& !strncmp(vendor, broken_vendors[i], vendor[OPT_LEN - 2])) {
-				DEBUG(LOG_INFO, "broken client (%s), forcing broadcast",
-					  broken_vendors[i]);
-				packet->flags |= htons(BROADCAST_FLAG);
-			}
-		}
-	}
-
-	return bytes;
-}
-
-static inline int get_raw_packet(struct dhcpMessage *payload, int l_fd)
-{
-	int bytes;
-	struct udp_dhcp_packet packet;
-	u_int32_t source, dest;
-	u_int16_t check;
-
-	memset(&packet, 0, sizeof(struct udp_dhcp_packet));
-	bytes = read(l_fd, &packet, sizeof(struct udp_dhcp_packet));
-	if (bytes < 0) {
-		DEBUG(LOG_INFO, "couldn't read on raw listening socket -- ignoring");
-		usleep(500000);	/* possible down interface, looping condition */
-		return -1;
-	}
-
-	if (bytes < (int) (sizeof(struct iphdr) + sizeof(struct udphdr))) {
-		DEBUG(LOG_INFO, "message too short, ignoring");
-		return -1;
-	}
-
-	if (bytes < ntohs(packet.ip.tot_len)) {
-		DEBUG(LOG_INFO, "Truncated packet");
-		return -1;
-	}
-
-	/* ignore any extra garbage bytes */
-	bytes = ntohs(packet.ip.tot_len);
-
-	/* Make sure its the right packet for us, and that it passes sanity checks */
-	if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION ||
-		packet.ip.ihl != sizeof(packet.ip) >> 2
-		|| packet.udp.dest != htons(CLIENT_PORT)
-		|| bytes > (int) sizeof(struct udp_dhcp_packet)
-		|| ntohs(packet.udp.len) != (short) (bytes - sizeof(packet.ip))) {
-		DEBUG(LOG_INFO, "unrelated/bogus packet");
-		return -1;
-	}
-
-	/* check IP checksum */
-	check = packet.ip.check;
-	packet.ip.check = 0;
-	if (check != checksum(&(packet.ip), sizeof(packet.ip))) {
-		DEBUG(LOG_INFO, "bad IP header checksum, ignoring");
-		return -1;
-	}
-
-	/* verify the UDP checksum by replacing the header with a psuedo header */
-	source = packet.ip.saddr;
-	dest = packet.ip.daddr;
-	check = packet.udp.check;
-	packet.udp.check = 0;
-	memset(&packet.ip, 0, sizeof(packet.ip));
-
-	packet.ip.protocol = IPPROTO_UDP;
-	packet.ip.saddr = source;
-	packet.ip.daddr = dest;
-	packet.ip.tot_len = packet.udp.len;	/* cheat on the psuedo-header */
-	if (check && check != checksum(&packet, bytes)) {
-		DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
-		return -1;
-	}
-
-	memcpy(payload, &(packet.data),
-		   bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
-
-	if (ntohl(payload->cookie) != DHCP_MAGIC) {
-		LOG(LOG_ERR, "received bogus message (bad magic) -- ignoring");
-		return -1;
-	}
-	DEBUG(LOG_INFO, "oooooh!!! got some!");
-	return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
-}
-
-
-int udhcpc_main(int argc, char *argv[])
-{
-	unsigned char *temp, *message;
-	unsigned long t1 = 0, t2 = 0, xid = 0;
-	unsigned long start = 0, lease;
-	fd_set rfds;
-	int retval;
-	struct timeval tv;
-	int c, len;
-	struct dhcpMessage packet;
-	struct in_addr temp_addr;
-	int pid_fd;
-	time_t now;
-
-	static struct option l_options[] = {
-		{"clientid", required_argument, 0, 'c'},
-		{"foreground", no_argument, 0, 'f'},
-		{"hostname", required_argument, 0, 'H'},
-		{"help", no_argument, 0, 'h'},
-		{"interface", required_argument, 0, 'i'},
-		{"now", no_argument, 0, 'n'},
-		{"pidfile", required_argument, 0, 'p'},
-		{"quit", no_argument, 0, 'q'},
-		{"request", required_argument, 0, 'r'},
-		{"script", required_argument, 0, 's'},
-		{"version", no_argument, 0, 'v'},
-		{0, 0, 0, 0}
-	};
-
-	/* get options */
-	while (1) {
-		int option_index = 0;
-
-		c = getopt_long(argc, argv, "c:fH:i:np:qr:s:v", l_options,
-						&option_index);
-		if (c == -1) {
-			break;
-		}
-
-		switch (c) {
-		case 'c':
-			len = strlen(optarg);
-			if (len > 255) {
-				len = 255;
-			}
-			if (client_config.clientid) {
-				free(client_config.clientid);
-			}
-			client_config.clientid = xmalloc(len + 2);
-			client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
-			client_config.clientid[OPT_LEN] = len;
-			client_config.clientid[OPT_DATA] = '\0';
-			strncpy(client_config.clientid + 3, optarg, len - 1);
-			break;
-		case 'f':
-			client_config.foreground = 1;
-			break;
-		case 'H':
-			len = strlen(optarg);
-			if (len > 255) {
-				len = 255;
-			}
-			if (client_config.hostname) {
-				free(client_config.hostname);
-			}
-			client_config.hostname = xmalloc(len + 2);
-			client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
-			client_config.hostname[OPT_LEN] = len;
-			strncpy(client_config.hostname + 2, optarg, len);
-			break;
-		case 'i':
-			client_config.interface = optarg;
-			break;
-		case 'n':
-			client_config.abort_if_no_lease = 1;
-			break;
-		case 'p':
-			client_config.pidfile = optarg;
-			break;
-		case 'q':
-			client_config.quit_after_lease = 1;
-			break;
-		case 'r':
-			requested_ip = inet_addr(optarg);
-			break;
-		case 's':
-			client_config.script = optarg;
-			break;
-		case 'v':
-			printf("udhcpcd, version %s\n\n", VERSION);
-			exit_client(0);
-			break;
-		default:
-			show_usage();
-		}
-	}
-
-	OPEN_LOG("udhcpc");
-	LOG(LOG_INFO, "udhcp client (v%s) started", VERSION);
-
-	pid_fd = pidfile_acquire(client_config.pidfile);
-	pidfile_write_release(pid_fd);
-
-	if (read_interface
-		(client_config.interface, &client_config.ifindex, NULL,
-		 client_config.arp) < 0) {
-		exit_client(1);
-	}
-
-	if (!client_config.clientid) {
-		client_config.clientid = xmalloc(6 + 3);
-		client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
-		client_config.clientid[OPT_LEN] = 7;
-		client_config.clientid[OPT_DATA] = 1;
-		memcpy(client_config.clientid + 3, client_config.arp, 6);
-	}
-
-	/* setup signal handlers */
-	signal(SIGUSR1, renew_requested);
-	signal(SIGUSR2, release_requested);
-	signal(SIGTERM, terminate);
-
-	state = INIT_SELECTING;
-	run_script(NULL, "deconfig");
-	change_mode(LISTEN_RAW);
-
-	for (;;) {
-		tv.tv_sec = timeout - time(0);
-		tv.tv_usec = 0;
-		FD_ZERO(&rfds);
-
-		if (listen_mode != LISTEN_NONE && fd_main < 0) {
-			if (listen_mode == LISTEN_KERNEL) {
-				fd_main =
-					listen_socket(INADDR_ANY, CLIENT_PORT,
-								  client_config.interface);
-			} else {
-				fd_main = raw_socket(client_config.ifindex);
-			}
-			if (fd_main < 0) {
-				LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s",
-					strerror(errno));
-				exit_client(0);
-			}
-		}
-		if (fd_main >= 0) {
-			FD_SET(fd_main, &rfds);
-		}
-
-		if (tv.tv_sec > 0) {
-			DEBUG(LOG_INFO, "Waiting on select...\n");
-			retval = select(fd_main + 1, &rfds, NULL, NULL, &tv);
-		} else {
-			retval = 0;	/* If we already timed out, fall through */
-		}
-
-		now = time(0);
-		if (retval == 0) {
-			/* timeout dropped to zero */
-			switch (state) {
-			case INIT_SELECTING:
-				if (packet_num < 3) {
-					if (packet_num == 0) {
-						xid = random_xid();
-					}
-					/* send discover packet */
-					send_discover(xid, requested_ip);	/* broadcast */
-
-					timeout = now + ((packet_num == 2) ? 10 : 2);
-					packet_num++;
-				} else {
-					if (client_config.abort_if_no_lease) {
-						LOG(LOG_INFO, "No lease, failing.");
-						exit_client(1);
-					}
-					/* wait to try again */
-					packet_num = 0;
-					timeout = now + 60;
-				}
-				break;
-			case RENEW_REQUESTED:
-			case REQUESTING:
-				if (packet_num < 3) {
-					/* send request packet */
-					if (state == RENEW_REQUESTED) {
-						send_renew(xid, server_addr, requested_ip);	/* unicast */
-					} else {
-						send_selecting(xid, server_addr, requested_ip);	/* broadcast */
-					}
-					timeout = now + ((packet_num == 2) ? 10 : 2);
-					packet_num++;
-				} else {
-					/* timed out, go back to init state */
-					state = INIT_SELECTING;
-					timeout = now;
-					packet_num = 0;
-					change_mode(LISTEN_RAW);
-				}
-				break;
-			case BOUND:
-				/* Lease is starting to run out, time to enter renewing state */
-				state = RENEWING;
-				change_mode(LISTEN_KERNEL);
-				DEBUG(LOG_INFO, "Entering renew state");
-				/* fall right through */
-			case RENEWING:
-				/* Either set a new T1, or enter REBINDING state */
-				if ((t2 - t1) <= (lease / 14400 + 1)) {
-					/* timed out, enter rebinding state */
-					state = REBINDING;
-					timeout = now + (t2 - t1);
-					DEBUG(LOG_INFO, "Entering rebinding state");
-				} else {
-					/* send a request packet */
-					send_renew(xid, server_addr, requested_ip);	/* unicast */
-
-					t1 = (t2 - t1) / 2 + t1;
-					timeout = t1 + start;
-				}
-				break;
-			case REBINDING:
-				/* Either set a new T2, or enter INIT state */
-				if ((lease - t2) <= (lease / 14400 + 1)) {
-					/* timed out, enter init state */
-					state = INIT_SELECTING;
-					LOG(LOG_INFO, "Lease lost, entering init state");
-					run_script(NULL, "deconfig");
-					timeout = now;
-					packet_num = 0;
-					change_mode(LISTEN_RAW);
-				} else {
-					/* send a request packet */
-					send_renew(xid, 0, requested_ip);	/* broadcast */
-
-					t2 = (lease - t2) / 2 + t2;
-					timeout = t2 + start;
-				}
-				break;
-			case RELEASED:
-				/* yah, I know, *you* say it would never happen */
-				timeout = 0x7fffffff;
-				break;
-			}
-		} else if (retval > 0 && listen_mode != LISTEN_NONE
-				   && FD_ISSET(fd_main, &rfds)) {
-			/* a packet is ready, read it */
-
-			if (listen_mode == LISTEN_KERNEL) {
-				len = get_packet(&packet, fd_main);
-			} else {
-				len = get_raw_packet(&packet, fd_main);
-			}
-			if (len == -1 && errno != EINTR) {
-				DEBUG(LOG_INFO, "error on read, %s, reopening socket",
-					  strerror(errno));
-				change_mode(listen_mode);	/* just close and reopen */
-			}
-			if (len < 0) {
-				continue;
-			}
-
-			if (packet.xid != xid) {
-				DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
-					  (unsigned long) packet.xid, xid);
-				continue;
-			}
-
-			if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
-				DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
-				continue;
-			}
-
-			switch (state) {
-			case INIT_SELECTING:
-				/* Must be a DHCPOFFER to one of our xid's */
-				if (*message == DHCPOFFER) {
-					if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
-						memcpy(&server_addr, temp, 4);
-						xid = packet.xid;
-						requested_ip = packet.yiaddr;
-
-						/* enter requesting state */
-						state = REQUESTING;
-						timeout = now;
-						packet_num = 0;
-					} else {
-						DEBUG(LOG_ERR, "No server ID in message");
-					}
-				}
-				break;
-			case RENEW_REQUESTED:
-			case REQUESTING:
-			case RENEWING:
-			case REBINDING:
-				if (*message == DHCPACK) {
-					if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
-						LOG(LOG_ERR,
-							"No lease time with ACK, using 1 hour lease");
-						lease = 60 * 60;
-					} else {
-						memcpy(&lease, temp, 4);
-						lease = ntohl(lease);
-					}
-
-					/* enter bound state */
-					t1 = lease / 2;
-
-					/* little fixed point for n * .875 */
-					t2 = (lease * 0x7) >> 3;
-					temp_addr.s_addr = packet.yiaddr;
-					LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
-						inet_ntoa(temp_addr), lease);
-					start = now;
-					timeout = t1 + start;
-					requested_ip = packet.yiaddr;
-					run_script(&packet,
-							   ((state == RENEWING
-								 || state == REBINDING) ? "renew" : "bound"));
-
-					state = BOUND;
-					change_mode(LISTEN_NONE);
-					{
-						int pid_fd2;
-
-						if (client_config.quit_after_lease) {
-							exit_client(0);
-						} else if (!client_config.foreground) {
-							pid_fd2 = pidfile_acquire(client_config.pidfile);	/* hold lock during fork. */
-							if (daemon(0, 0) == -1) {
-								perror("fork");
-								exit_client(1);
-							}
-							client_config.foreground = 1;	/* Do not fork again. */
-							pidfile_write_release(pid_fd2);
-						}
-					}
-				} else if (*message == DHCPNAK) {
-					/* return to init state */
-					LOG(LOG_INFO, "Received DHCP NAK");
-					run_script(&packet, "nak");
-					if (state != REQUESTING) {
-						run_script(NULL, "deconfig");
-					}
-					state = INIT_SELECTING;
-					timeout = now;
-					requested_ip = 0;
-					packet_num = 0;
-					change_mode(LISTEN_RAW);
-					sleep(3);	/* avoid excessive network traffic */
-				}
-				break;
-				/* case BOUND, RELEASED: - ignore all packets */
-			}
-		} else if (retval == -1 && errno == EINTR) {
-			/* a signal was caught */
-
-		} else {
-			/* An error occured */
-			DEBUG(LOG_ERR, "Error on select");
-		}
-
-	}
-	return 0;
-}