int udhcpd_main(int argc, char **argv)
{
	fd_set rfds;
	struct timeval tv;
	int server_socket = -1, bytes, retval, max_sock;
	struct dhcpMessage packet;
	uint8_t *state, *server_id, *requested;
	uint32_t server_id_align, requested_align, static_lease_ip;
	unsigned timeout_end;
	unsigned num_ips;
	unsigned opt;
	struct option_set *option;
	struct dhcpOfferedAddr *lease, static_lease;

	opt = getopt32(argv, "fS");
	argv += optind;

	if (!(opt & 1)) { /* no -f */
		bb_daemonize_or_rexec(0, argv);
		logmode &= ~LOGMODE_STDIO;
	}

	if (opt & 2) { /* -S */
		openlog(applet_name, LOG_PID, LOG_LOCAL0);
		logmode |= LOGMODE_SYSLOG;
	}

	/* Would rather not do read_config before daemonization -
	 * otherwise NOMMU machines will parse config twice */
	read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE);

	/* Make sure fd 0,1,2 are open */
	bb_sanitize_stdio();
	/* Equivalent of doing a fflush after every \n */
	setlinebuf(stdout);

	/* Create pidfile */
	write_pidfile(server_config.pidfile);
	/* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */

	bb_info_msg("%s (v"BB_VER") started", applet_name);

	option = find_option(server_config.options, DHCP_LEASE_TIME);
	server_config.lease = LEASE_TIME;
	if (option) {
		memcpy(&server_config.lease, option->data + 2, 4);
		server_config.lease = ntohl(server_config.lease);
	}

	/* Sanity check */
	num_ips = server_config.end_ip - server_config.start_ip + 1;
	if (server_config.max_leases > num_ips) {
		bb_error_msg("max_leases=%u is too big, setting to %u",
			(unsigned)server_config.max_leases, num_ips);
		server_config.max_leases = num_ips;
	}

	leases = xzalloc(server_config.max_leases * sizeof(*leases));
	read_leases(server_config.lease_file);

	if (read_interface(server_config.interface, &server_config.ifindex,
			   &server_config.server, server_config.arp)) {
		retval = 1;
		goto ret;
	}

	/* Setup the signal pipe */
	udhcp_sp_setup();

	timeout_end = monotonic_sec() + server_config.auto_time;
	while (1) { /* loop until universe collapses */

		if (server_socket < 0) {
			server_socket = listen_socket(/*INADDR_ANY,*/ SERVER_PORT,
					server_config.interface);
		}

		max_sock = udhcp_sp_fd_set(&rfds, server_socket);
		if (server_config.auto_time) {
			tv.tv_sec = timeout_end - monotonic_sec();
			tv.tv_usec = 0;
		}
		retval = 0;
		if (!server_config.auto_time || tv.tv_sec > 0) {
			retval = select(max_sock + 1, &rfds, NULL, NULL,
					server_config.auto_time ? &tv : NULL);
		}
		if (retval == 0) {
			write_leases();
			timeout_end = monotonic_sec() + server_config.auto_time;
			continue;
		}
		if (retval < 0 && errno != EINTR) {
			DEBUG("error on select");
			continue;
		}

		switch (udhcp_sp_read(&rfds)) {
		case SIGUSR1:
			bb_info_msg("Received a SIGUSR1");
			write_leases();
			/* why not just reset the timeout, eh */
			timeout_end = monotonic_sec() + server_config.auto_time;
			continue;
		case SIGTERM:
			bb_info_msg("Received a SIGTERM");
			goto ret0;
		case 0: break;		/* no signal */
		default: continue;	/* signal or error (probably EINTR) */
		}

		bytes = udhcp_recv_packet(&packet, server_socket); /* this waits for a packet - idle */
		if (bytes < 0) {
			if (bytes == -1 && errno != EINTR) {
				DEBUG("error on read, %s, reopening socket", strerror(errno));
				close(server_socket);
				server_socket = -1;
			}
			continue;
		}

		state = get_option(&packet, DHCP_MESSAGE_TYPE);
		if (state == NULL) {
			bb_error_msg("cannot get option from packet, ignoring");
			continue;
		}

		/* Look for a static lease */
		static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);

		if (static_lease_ip) {
			bb_info_msg("Found static lease: %x", static_lease_ip);

			memcpy(&static_lease.chaddr, &packet.chaddr, 16);
			static_lease.yiaddr = static_lease_ip;
			static_lease.expires = 0;

			lease = &static_lease;
		} else {
			lease = find_lease_by_chaddr(packet.chaddr);
		}

		switch (state[0]) {
		case DHCPDISCOVER:
			DEBUG("Received DISCOVER");

			if (sendOffer(&packet) < 0) {
				bb_error_msg("send OFFER failed");
			}
            /* circle test Stat. add by wangpu begin */
            g_offercount ++;
            printf("Circle test: [DHCPS] send OFFER packet num:[%d]\n",g_offercount);
            memset(g_acCmd,0,sizeof(g_acCmd));
            memset(g_interface,0,sizeof(g_interface));
            sprintf(g_interface,"%s",server_config.interface);
            sprintf(g_acCmd,"echo %d > /var/circle/%s",g_offercount,g_interface);
            system(g_acCmd);
            /* circle test Stat. add by wangpu end */
			break;
		case DHCPREQUEST:
			DEBUG("received REQUEST");
			#if 0
			/* ?¡¤??2a¨º? add by wangpu begin */
			   g_offercount ++;
               printf("Circle test: [DHCPS] send OFFER packet num:[%d]\n",g_offercount);
			   memset(g_acCmd,0,sizeof(g_acCmd));
			   memset(g_interface,0,sizeof(g_interface));
			   sprintf(g_interface,"%s",server_config.interface);
			   sprintf(g_acCmd,"echo %d > /var/circle/%s",g_offercount,g_interface);
		       system(g_acCmd);
		    /* ?¡¤??2a¨º? add by wangpu begin */
            #endif
			requested = get_option(&packet, DHCP_REQUESTED_IP);
			server_id = get_option(&packet, DHCP_SERVER_ID);

			if (requested) memcpy(&requested_align, requested, 4);
			if (server_id) memcpy(&server_id_align, server_id, 4);

			if (lease) {
				if (server_id) {
					/* SELECTING State */
					DEBUG("server_id = %08x", ntohl(server_id_align));
					if (server_id_align == server_config.server && requested
					 && requested_align == lease->yiaddr
					) {
						sendACK(&packet, lease->yiaddr);
					}
				} else if (requested) {
					/* INIT-REBOOT State */
					if (lease->yiaddr == requested_align)
						sendACK(&packet, lease->yiaddr);
					else
						sendNAK(&packet);
				} else if (lease->yiaddr == packet.ciaddr) {
					/* RENEWING or REBINDING State */
					sendACK(&packet, lease->yiaddr);
				} else {
					/* don't know what to do!!!! */
					sendNAK(&packet);
				}

			/* what to do if we have no record of the client */
			} else if (server_id) {
				/* SELECTING State */

			} else if (requested) {
				/* INIT-REBOOT State */
				lease = find_lease_by_yiaddr(requested_align);
				if (lease) {
					if (lease_expired(lease)) {
						/* probably best if we drop this lease */
						memset(lease->chaddr, 0, 16);
					/* make some contention for this address */
					} else
						sendNAK(&packet);
				} else {
					uint32_t r = ntohl(requested_align);
					if (r < server_config.start_ip
				         || r > server_config.end_ip
					) {
						sendNAK(&packet);
					}
					/* else remain silent */
				}

			} else {
				/* RENEWING or REBINDING State */
			}
			break;
		case DHCPDECLINE:
			DEBUG("Received DECLINE");
			if (lease) {
				memset(lease->chaddr, 0, 16);
				lease->expires = time(0) + server_config.decline_time;
			}
			break;
		case DHCPRELEASE:
			DEBUG("Received RELEASE");
			if (lease)
				lease->expires = time(0);
			break;
		case DHCPINFORM:
			DEBUG("Received INFORM");
			send_inform(&packet);
			break;
		default:
			bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]);
		}
	}
 ret0:
	retval = 0;
 ret:
	/*if (server_config.pidfile) - server_config.pidfile is never NULL */
		remove_pidfile(server_config.pidfile);
	return retval;
}
예제 #2
0
/* send a DHCP OFFER to a DHCP DISCOVER */
int sendOffer(struct dhcpMessage *oldpacket)
{
        struct dhcpMessage packet;
        struct dhcpOfferedAddr *lease = NULL;
        u_int32_t req_align, lease_time_align = cur_iface->lease;
        char *req, *lease_time;
        struct option_set *curr;
        struct in_addr addr;
	//For static IP lease
	uint32_t static_lease_ip;

        //brcm begin
        char VIinfo[VENDOR_IDENTIFYING_INFO_LEN];
        //brcm end

        init_packet(&packet, oldpacket, DHCPOFFER);
        
	//For static IP lease
	static_lease_ip = getIpByMac(cur_iface->static_leases,
		oldpacket->chaddr);

	if(!static_lease_ip) {
        	/* the client is in our lease/offered table */
        	if ((lease = find_lease_by_chaddr(oldpacket->chaddr))) {
                	if (!lease_expired(lease)) 
                        	lease_time_align = lease->expires - time(0);
                	packet.yiaddr = lease->yiaddr;
        	/* Or the client has a requested ip */
        	} else if ((req = (char *)get_option(oldpacket, DHCP_REQUESTED_IP)) &&

			/* Don't look here (ugly hackish thing to do) */
			memcpy(&req_align, req, 4) && 

			/* and the ip is in the lease range */
			ntohl(req_align) >= ntohl(cur_iface->start) &&
			ntohl(req_align) <= ntohl(cur_iface->end) && 

			/* and its not already taken/offered */
			((!(lease = find_lease_by_yiaddr(req_align)) ||

			/* or its taken, but expired */
			lease_expired(lease)))) {
				packet.yiaddr = req_align; 

		/* otherwise, find a free IP */
        	} else {
                	packet.yiaddr = find_address(0);
                
                	/* try for an expired lease */
			if (!packet.yiaddr) packet.yiaddr = find_address(1);
        	}
        
        	if(!packet.yiaddr) {
                	LOG(LOG_WARNING, "no IP addresses to give -- "
				"OFFER abandoned");
                	return -1;
        	}
        
        	if (!add_lease(packet.chaddr, packet.yiaddr,
			server_config.offer_time)) {
                	LOG(LOG_WARNING, "lease pool is full -- "
				"OFFER abandoned");
                	return -1;
        	}               

        	if ((lease_time = (char *)get_option(oldpacket, DHCP_LEASE_TIME))) {
                	memcpy(&lease_time_align, lease_time, 4);
                	lease_time_align = ntohl(lease_time_align);
                	if (lease_time_align > cur_iface->lease) 
                        	lease_time_align = cur_iface->lease;
        	}

        	/* Make sure we aren't just using the lease time from the
		 * previous offer */
        	if (lease_time_align < server_config.min_lease) 
                	lease_time_align = cur_iface->lease;

//<< jojopo : wifi leasetime 300 seconds , 2015/12/25
         if(isHostFromWireless(packet.chaddr))
            lease_time_align = 300;
//>> jojopo : end
	} else {
		/* It is a static lease... use it */
		packet.yiaddr = static_lease_ip;
	}
                
        add_simple_option(packet.options, DHCP_LEASE_TIME, lease_time_align);

        curr = cur_iface->options;
        while (curr) {
                if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
                        add_option_string(packet.options, curr->data);
                curr = curr->next;
        }

        add_bootp_options(&packet);

        //brcm begin
        /* if DHCPDISCOVER from client has device identity, send back gateway identity */
        if ((req = (char *)get_option(oldpacket, DHCP_VENDOR_IDENTIFYING))) {
          if (createVIoption(VENDOR_IDENTIFYING_FOR_GATEWAY, VIinfo) != -1)
            add_option_string(packet.options, (unsigned char *)VIinfo);
        }
        //brcm end

        addr.s_addr = packet.yiaddr;
        LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
        return send_packet(&packet, 0);
}
예제 #3
0
/* send a DHCP OFFER to a DHCP DISCOVER */
int send_offer(struct dhcpMessage *oldpacket)
{
	struct dhcpMessage packet;
	struct dhcpOfferedAddr *lease = NULL;
	uint32_t req_align, lease_time_align = server_config.lease;
	uint8_t *req, *lease_time;
	struct option_set *curr;
	struct in_addr addr;

	uint32_t static_lease_ip;

	init_packet(&packet, oldpacket, DHCPOFFER);

	static_lease_ip = getIpByMac(server_config.static_leases, oldpacket->chaddr);

	/* ADDME: if static, short circuit */
	if (!static_lease_ip) {
		/* the client is in our lease/offered table */
		lease = find_lease_by_chaddr(oldpacket->chaddr);
		if (lease) {
			if (!lease_expired(lease))
				lease_time_align = lease->expires - time(0);
			packet.yiaddr = lease->yiaddr;
		/* Or the client has a requested ip */
		} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP))
		 /* Don't look here (ugly hackish thing to do) */
		 && memcpy(&req_align, req, 4)
		 /* and the ip is in the lease range */
		 && ntohl(req_align) >= server_config.start_ip
		 && ntohl(req_align) <= server_config.end_ip
		 && !static_lease_ip /* Check that its not a static lease */
		 /* and is not already taken/offered */
		 && (!(lease = find_lease_by_yiaddr(req_align))
			/* or its taken, but expired */ /* ADDME: or maybe in here */
			|| lease_expired(lease))
		) {
			packet.yiaddr = req_align; /* FIXME: oh my, is there a host using this IP? */
			/* otherwise, find a free IP */
		} else {
			/* Is it a static lease? (No, because find_address skips static lease) */
			packet.yiaddr = find_address(0);
			/* try for an expired lease */
			if (!packet.yiaddr)
				packet.yiaddr = find_address(1);
		}

		if (!packet.yiaddr) {
			bb_error_msg("no IP addresses to give - OFFER abandoned");
			return -1;
		}
		if (!add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time)) {
			bb_error_msg("lease pool is full - OFFER abandoned");
			return -1;
		}
		lease_time = get_option(oldpacket, DHCP_LEASE_TIME);
		if (lease_time) {
			memcpy(&lease_time_align, lease_time, 4);
			lease_time_align = ntohl(lease_time_align);
			if (lease_time_align > server_config.lease)
				lease_time_align = server_config.lease;
		}

		/* Make sure we aren't just using the lease time from the previous offer */
		if (lease_time_align < server_config.min_lease)
			lease_time_align = server_config.lease;
		/* ADDME: end of short circuit */
	} else {
		/* It is a static lease... use it */
		packet.yiaddr = static_lease_ip;
	}

	add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));

	curr = server_config.options;
	while (curr) {
		if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
			add_option_string(packet.options, curr->data);
		curr = curr->next;
	}

	add_bootp_options(&packet);

	addr.s_addr = packet.yiaddr;
	bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
	return send_packet(&packet, 0);
}
예제 #4
0
int main(int argc, char *argv[])
#endif
{
	fd_set rfds;
	struct timeval tv;
	int server_socket = -1;
	int bytes, retval;
	struct dhcpMessage packet;
	uint8_t *state;
	uint8_t *server_id, *requested;
	uint8_t *hostname;
	uint32_t server_id_align, requested_align;
	unsigned long timeout_end;
	struct option_set *option;
	struct dhcpOfferedAddr *lease;
	struct dhcpOfferedAddr static_lease;
	int max_sock;
	unsigned long num_ips;

	uint32_t static_lease_ip;

	memset(&server_config, 0, sizeof(struct server_config_t));
	read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]);
	read_config_static_leases(DHCPD_STATIC_LEASES_FILE);

	/* Start the log, sanitize fd's, and write a pid file */
	start_log_and_pid("udhcpd", server_config.pidfile);

	if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) {
		memcpy(&server_config.lease, option->data + 2, 4);
		server_config.lease = ntohl(server_config.lease);
	}
	else server_config.lease = LEASE_TIME;

	/* Sanity check */
	num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1;
	if (server_config.max_leases > num_ips) {
//		LOG(LOG_ERR, "max_leases value (%lu) not sane, "
//			"setting to %lu instead",
//			server_config.max_leases, num_ips);
		server_config.max_leases = num_ips;
	}

	leases = xcalloc(server_config.max_leases, sizeof(struct dhcpOfferedAddr));
	read_leases(server_config.lease_file);

	if (read_interface(server_config.interface, &server_config.ifindex,
			   &server_config.server, server_config.arp) < 0)
		return 1;

#ifndef UDHCP_DEBUG
	background(server_config.pidfile); /* hold lock during fork. */
#endif

	/* Setup the signal pipe */
	udhcp_sp_setup();

	timeout_end = time(0) + server_config.auto_time;
	while(1) { /* loop until universe collapses */

		if (server_socket < 0)
			if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) {
				LOG(LOG_ERR, "FATAL: couldn't create server socket, %m");
				return 2;
			}

		max_sock = udhcp_sp_fd_set(&rfds, server_socket);
		if (server_config.auto_time) {
			tv.tv_sec = timeout_end - time(0);
			tv.tv_usec = 0;
		}
		if (!server_config.auto_time || tv.tv_sec > 0) {
			retval = select(max_sock + 1, &rfds, NULL, NULL,
					server_config.auto_time ? &tv : NULL);
		} else retval = 0; /* If we already timed out, fall through */

		if (retval == 0) {
			write_leases();
			timeout_end = time(0) + server_config.auto_time;
			continue;
		} else if (retval < 0 && errno != EINTR) {
			DEBUG(LOG_INFO, "error on select");
			continue;
		}

		switch (udhcp_sp_read(&rfds)) {
		case SIGUSR1:
			LOG(LOG_INFO, "Received a SIGUSR1");
			write_leases();
			/* why not just reset the timeout, eh */
			timeout_end = time(0) + server_config.auto_time;
			continue;
		case SIGTERM:
			LOG(LOG_INFO, "Received a SIGTERM");
			return 0;
		case 0: break;		/* no signal */
		default: continue;	/* signal or error (probably EINTR) */
		}

		if ((bytes = get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */
			if (bytes == -1 && errno != EINTR) {
				DEBUG(LOG_INFO, "error on read, %m, reopening socket");
				close(server_socket);
				server_socket = -1;
			}
			continue;
		}

		if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
			DEBUG(LOG_ERR, "couldn't get option from packet, ignoring");
			continue;
		}

		/* Look for a static lease */
		static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);

		if(static_lease_ip)
		{
			printf("Found static lease: %x\n", static_lease_ip);

			memcpy(&static_lease.chaddr, &packet.chaddr, 16);
			static_lease.yiaddr = static_lease_ip;
			static_lease.expires = 0;

			lease = &static_lease;

		}
		else
		{
		lease = find_lease_by_chaddr(packet.chaddr);
		}

		switch (state[0]) {
		case DHCPDISCOVER:
			DEBUG(LOG_INFO,"received DISCOVER");

			if (sendOffer(&packet) < 0) {
				LOG(LOG_ERR, "send OFFER failed");
			}
			break;
 		case DHCPREQUEST:
			DEBUG(LOG_INFO, "received REQUEST");

			requested = get_option(&packet, DHCP_REQUESTED_IP);
			server_id = get_option(&packet, DHCP_SERVER_ID);
			hostname = get_option(&packet, DHCP_HOST_NAME);
			if (requested) memcpy(&requested_align, requested, 4);
			if (server_id) memcpy(&server_id_align, server_id, 4);

			if (lease) {
				if (server_id) {
					/* SELECTING State */
					DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align));
					if (server_id_align == server_config.server && requested &&
					    requested_align == lease->yiaddr) {
						sendACK(&packet, lease->yiaddr);
					}
				} else {
					if (requested) {
						/* INIT-REBOOT State */
						if (lease->yiaddr == requested_align)
							sendACK(&packet, lease->yiaddr);
						else sendNAK(&packet);
					} else {
						/* RENEWING or REBINDING State */
						if (lease->yiaddr == packet.ciaddr)
							sendACK(&packet, lease->yiaddr);
						else {
							/* don't know what to do!!!! */
							sendNAK(&packet);
						}
					}
				}
				if (hostname) {
					bytes = hostname[-1];
					if (bytes >= (int) sizeof(lease->hostname))
						bytes = sizeof(lease->hostname) - 1;
					strncpy(lease->hostname, hostname, bytes);
					lease->hostname[bytes] = '\0';
				} else
					lease->hostname[0] = '\0';

			/* what to do if we have no record of the client */
			} else if (server_id) {
				/* SELECTING State */

			} else if (requested) {
				/* INIT-REBOOT State */
				if ((lease = find_lease_by_yiaddr(requested_align))) {
					if (lease_expired(lease)) {
						/* probably best if we drop this lease */
						memset(lease->chaddr, 0, 16);
					/* make some contention for this address */
					} else sendNAK(&packet);
				} else if (requested_align < server_config.start ||
					   requested_align > server_config.end) {
					sendNAK(&packet);
				} /* else remain silent */

			} else {
				 /* RENEWING or REBINDING State */
			}
			break;
		case DHCPDECLINE:
			DEBUG(LOG_INFO,"received DECLINE");
			if (lease) {
				memset(lease->chaddr, 0, 16);
				lease->expires = time(0) + server_config.decline_time;
			}
			break;
		case DHCPRELEASE:
			DEBUG(LOG_INFO,"received RELEASE");
			if (lease) lease->expires = time(0);
			break;
		case DHCPINFORM:
			DEBUG(LOG_INFO,"received INFORM");
			send_inform(&packet);
			break;
		default:
			LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
		}
	}

	return 0;
}
예제 #5
0
/* send a DHCP OFFER to a DHCP DISCOVER */
int sendOffer(struct dhcpMessage *oldpacket)
{
	struct dhcpMessage packet;
	struct dhcpOfferedAddr *lease = NULL;
	u_int32_t req_align, lease_time_align = server_config.lease;
	char *req, *lease_time;
	struct option_set *curr;
	struct in_addr addr;
	char *hostname;
	char hostname_copy[64];

	uint32_t static_lease_ip;

	init_packet(&packet, oldpacket, DHCPOFFER);
	
	static_lease_ip = getIpByMac(server_config.static_leases, oldpacket->chaddr);

	/* ADDME: if static, short circuit */
	if(!static_lease_ip)
	{
		/* the client is in our lease/offered table */
		if ((lease = find_lease_by_chaddr(oldpacket->chaddr))) {
			if (!lease_expired(lease)) 
				lease_time_align = lease->expires - time(0);
			packet.yiaddr = lease->yiaddr;
			
		/* Or the client has a requested ip */
		} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP)) &&

			   /* Don't look here (ugly hackish thing to do) */
			   memcpy(&req_align, req, 4) &&

			   /* and the ip is in the lease range */
			   ntohl(req_align) >= ntohl(server_config.start) &&
			   ntohl(req_align) <= ntohl(server_config.end) &&
			   
			   !static_lease_ip &&  /* Check that its not a static lease */
			   /* and its not already taken/offered */
			   ((!(lease = find_lease_by_yiaddr(req_align)) ||
			   
			   /* or its taken, but expired */
			   lease_expired(lease)))) {
					packet.yiaddr = req_align;

		/* otherwise, find a free IP */
		} else {
			packet.yiaddr = find_address(0);
			
			/* try for an expired lease */
			if (!packet.yiaddr) packet.yiaddr = find_address(1);
		}
		
		if(!packet.yiaddr) {
			LOG(LOG_WARNING, "no IP addresses to give -- OFFER abandoned");
			return -1;
		}

		hostname = get_option(oldpacket, DHCP_HOST_NAME);
		memset(hostname_copy, 0, sizeof(hostname_copy));
		if (hostname) {
		    memcpy(hostname_copy, hostname, hostname[-1]);
		}
		
		if (!add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time, hostname_copy)) {
			LOG(LOG_WARNING, "lease pool is full -- OFFER abandoned");
			return -1;
		}		

		if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
			memcpy(&lease_time_align, lease_time, 4);
			lease_time_align = ntohl(lease_time_align);
			if (lease_time_align > server_config.lease) 
				lease_time_align = server_config.lease;
		}

		/* Make sure we aren't just using the lease time from the previous offer */
		if (lease_time_align < server_config.min_lease) 
			lease_time_align = server_config.lease;
	}
	/* ADDME: end of short circuit */
	else
	{
		/* It is a static lease... use it */
		packet.yiaddr = static_lease_ip;
	}
		
	add_simple_option(packet.options, DHCP_LEASE_TIME, lease_time_align);

	curr = server_config.options;
	while (curr) {
		if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
			add_option_string(packet.options, curr->data);
		curr = curr->next;
	}

	add_bootp_options(&packet);
	
	addr.s_addr = packet.yiaddr;
	LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
	return send_packet(&packet, 0);
}