Ejemplo n.º 1
0
Archivo: dhcpc.c Proyecto: foxwolf/yjd
int main(int argc, char *argv[])
#endif
{
	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;
	int max_fd;
	int sig;

	static struct option arg_options[] = {
		{"clientid",	required_argument,	0, 'c'},
		{"foreground",	no_argument,		0, 'f'},
		{"background",	no_argument,		0, 'b'},
		{"hostname",	required_argument,	0, 'H'},
		{"hostname",    required_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'},
		{"help",	no_argument,		0, '?'},
		{0, 0, 0, 0}
	};

	/* get options */
	while (1) {
		int option_index = 0;
		c = getopt_long(argc, argv, "c:fbH:h:i:np:qr:s:v", arg_options, &option_index);
		if (c == -1) break;
		
		switch (c) {
		case 'c':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			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 + OPT_DATA, optarg, len);
			break;
		case 'f':
			client_config.foreground = 1;
			break;
		case 'b':
			client_config.background_if_no_lease = 1;
			break;
		case 'h':
		case 'H':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			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 */
	socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
	signal(SIGUSR1, signal_handler);
	signal(SIGUSR2, signal_handler);
	signal(SIGTERM, signal_handler);
	
	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 < 0) {
			if (listen_mode == LISTEN_KERNEL)
				fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
			else
				fd = raw_socket(client_config.ifindex);
			if (fd < 0) {
				LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s", strerror(errno));
				exit_client(0);
			}
		}
		if (fd >= 0) FD_SET(fd, &rfds);
		FD_SET(signal_pipe[0], &rfds);		

		if (tv.tv_sec > 0) {
			DEBUG(LOG_INFO, "Waiting on select...\n");
			max_fd = signal_pipe[0] > fd ? signal_pipe[0] : fd;
			retval = select(max_fd + 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) ? 4 : 2);
					packet_num++;
				} else {
					if (client_config.background_if_no_lease) {
						LOG(LOG_INFO, "No lease, forking to background.");
						background();
					} 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 */
					if (state == RENEW_REQUESTED) run_script(NULL, "deconfig");
					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, &rfds)) {
			/* a packet is ready, read it */
			
			if (listen_mode == LISTEN_KERNEL)
				len = get_packet(&packet, fd);
			else len = get_raw_packet(&packet, fd);
			
			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);
					if (client_config.quit_after_lease) 
						exit_client(0);
					if (!client_config.foreground)
						background();

				} 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 > 0 && FD_ISSET(signal_pipe[0], &rfds)) {
Ejemplo n.º 2
0
int main(int argc, char *argv[])
#endif
{
	char *temp, *message;
	unsigned long t1 = 0, t2 = 0, xid = 0;
	unsigned long start = 0, lease;
	fd_set rfds;
	int fd, retval;
	struct timeval tv;
	int c, len;
	struct ifreq ifr;
	struct dhcpMessage packet;
	struct in_addr temp_addr;
	int pid_fd;

	static struct option 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;
// brcm
		c = getopt_long(argc, argv, "c:fH:hi:np:qr:s:d:v", options, &option_index);
		if (c == -1) break;
		
		switch (c) {
		case 'c':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			if (client_config.clientid) free(client_config.clientid);
			client_config.clientid = malloc(len + 2);
			client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
			client_config.clientid[OPT_LEN] = len;
			strncpy(client_config.clientid + 2, optarg, len);
			break;
		case 'f':
			client_config.foreground = 1;
			break;
		case 'H':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			if (client_config.hostname) free(client_config.hostname);
			client_config.hostname = malloc(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 'h':
			print_usage();
			return 0;
		case 'i':
			client_config.interface =  optarg;
// brcm
			strcpy(session_path, 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;
// brcm
		case 'd':
			strcpy(vendor_class_id, optarg);
			break;
		case 's':
			client_config.script = optarg;
			break;
		case 'v':
			printf("udhcpcd, version %s\n\n", VERSION);
			break;
		}
	}

	// brcm
        if (strlen(session_path) > 0) {
	    sprintf(status_path, "%s/%s/%s", _PATH_WAN_DIR, session_path, _PATH_MSG);
	    sprintf(pid_path, "%s/%s/%s", _PATH_WAN_DIR, session_path, _PATH_PID);
	}

	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 ((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
		strcpy(ifr.ifr_name, client_config.interface);
		if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
			DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
			client_config.ifindex = ifr.ifr_ifindex;
		} else {
			LOG(LOG_ERR, "SIOCGIFINDEX failed! %s", strerror(errno));
			exit_client(1);
		}
		if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
			memcpy(client_config.arp, ifr.ifr_hwaddr.sa_data, 6);
			DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
				client_config.arp[0], client_config.arp[1], client_config.arp[2], 
				client_config.arp[3], client_config.arp[4], client_config.arp[5]);
		} else {
			LOG(LOG_ERR, "SIOCGIFHWADDR failed! %s", strerror(errno));
			exit_client(1);
		}
	} else {
		LOG(LOG_ERR, "socket failed! %s", strerror(errno));
		exit_client(1);
	}
	close(fd);
	fd = -1;

	/* setup signal handlers */
	signal(SIGUSR1, renew_requested);
	signal(SIGUSR2, release_requested);
	signal(SIGTERM, terminate);
	
	state = INIT_SELECTING;
	// brcm
	// run_script(NULL, "deconfig");

	// brcm
	setStatus(0);

	for (;;) {

		// brcm
		if ((old_mode != listen_mode) || (fd == -1)) {
		    old_mode = listen_mode;
		
		    if (fd > 0) {
			    close(fd);
			    fd = -1;
		    }
		
		    if (listen_mode == LISTEN_RAW) {
			    if ((fd = raw_socket(client_config.ifindex)) < 0) {
				    LOG(LOG_ERR, "couldn't create raw socket -- au revoir");
				    exit_client(0);
			    }
		    }
		    else if (listen_mode == LISTEN_KERNEL) {
			    if ((fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface)) < 0) {
				    LOG(LOG_ERR, "couldn't create server socket -- au revoir");
				    exit_client(0);
			    }			
		    } else 
			fd = -1;
		}

		tv.tv_sec = timeout - time(0);
		tv.tv_usec = 0;
		FD_ZERO(&rfds);
		if (listen_mode) FD_SET(fd, &rfds);
		
		if (tv.tv_sec > 0) {
			retval = select(fd + 1, &rfds, NULL, NULL, &tv);
		} else retval = 0; /* If we already timed out, fall through */
		
		if (retval == 0) {
			/* timeout dropped to zero */
			switch (state) {
			case INIT_SELECTING:
				// brcm
				setStatus(0);
				if (packet_num < 3) {
					if (packet_num == 0)
						xid = random_xid();

					/* send discover packet */
					send_discover(xid, requested_ip); /* broadcast */
					
					timeout = time(0) + ((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 = time(0) + 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 = time(0) + ((packet_num == 2) ? 10 : 2);
					packet_num++;
				} else {
					/* timed out, go back to init state */
					state = INIT_SELECTING;
					timeout = time(0);
					packet_num = 0;
					listen_mode = LISTEN_RAW;
					
				}
				break;
			case BOUND:
				/* Lease is starting to run out, time to enter renewing state */
				state = RENEWING;
				listen_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 = time(0) + (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 = time(0);
					packet_num = 0;
					listen_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 = 0xffffffff;
				break;
			}
		} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
			/* a packet is ready, read it */
			
			if (listen_mode == LISTEN_KERNEL) {
				if (get_packet(&packet, fd) < 0) continue;
			} else {
				if (get_raw_packet(&packet, fd) < 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 = time(0);
						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 = time(0);
					timeout = t1 + start;
					requested_ip = packet.yiaddr;
					run_script(&packet,
						   ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));

					state = BOUND;
					listen_mode = LISTEN_NONE;
					
					// brcm
					setStatus(1);
					background();
					
				} else if (*message == DHCPNAK) {
					/* return to init state */
					LOG(LOG_INFO, "Received DHCP NAK");
					if (state != REQUESTING)
						run_script(NULL, "deconfig");
					state = INIT_SELECTING;
					timeout = time(0);
					requested_ip = 0;
					packet_num = 0;
					listen_mode = LISTEN_RAW;

					// brcm
					setStatus(0);
				}
				break;
			case BOUND:
			case RELEASED:
				/* ignore all packets */
				break;
			}					
		} else if (retval == -1 && errno == EINTR) {
Ejemplo n.º 3
0
int udhcpc_main(int argc, char **argv)
{
	uint8_t *temp, *message;
	char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
	unsigned long t1 = 0, t2 = 0, xid = 0;
	unsigned long start = 0, lease = 0;
	long now;
	unsigned opt;
	int max_fd;
	int sig;
	int retval;
	int len;
	int no_clientid = 0;
	fd_set rfds;
	struct timeval tv;
	struct dhcpMessage packet;
	struct in_addr temp_addr;

	enum {
		OPT_c = 1 << 0,
		OPT_C = 1 << 1,
		OPT_V = 1 << 2,
		OPT_f = 1 << 3,
		OPT_b = 1 << 4,
		OPT_H = 1 << 5,
		OPT_h = 1 << 6,
		OPT_F = 1 << 7,
		OPT_i = 1 << 8,
		OPT_n = 1 << 9,
		OPT_p = 1 << 10,
		OPT_q = 1 << 11,
		OPT_R = 1 << 12,
		OPT_r = 1 << 13,
		OPT_s = 1 << 14,
		OPT_T = 1 << 15,
		OPT_t = 1 << 16,
		OPT_v = 1 << 17,
	};
#if ENABLE_GETOPT_LONG
	static const struct option arg_options[] = {
		{ "clientid",   required_argument,      0, 'c' },
		{ "clientid-none", no_argument,         0, 'C' },
		{ "vendorclass", required_argument,     0, 'V' },
		{ "foreground", no_argument,            0, 'f' },
		{ "background", no_argument,            0, 'b' },
		{ "hostname",   required_argument,      0, 'H' },
		{ "hostname",   required_argument,      0, 'h' },
		{ "fqdn",       required_argument,      0, 'F' },
		{ "interface",  required_argument,      0, 'i' },
		{ "now",        no_argument,            0, 'n' },
		{ "pidfile",    required_argument,      0, 'p' },
		{ "quit",       no_argument,            0, 'q' },
		{ "release",    no_argument,            0, 'R' },
		{ "request",    required_argument,      0, 'r' },
		{ "script",     required_argument,      0, 's' },
		{ "timeout",    required_argument,      0, 'T' },
		{ "version",    no_argument,            0, 'v' },
		{ "retries",    required_argument,      0, 't' },
		{ 0, 0, 0, 0 }
	};
#endif
	/* Default options. */
	client_config.interface = "eth0";
	client_config.script = DEFAULT_SCRIPT;
	client_config.retries = 3;
	client_config.timeout = 3;

	/* Parse command line */
	opt_complementary = "?:c--C:C--c" // mutually exclusive
	                    ":hH:Hh"; // -h and -H are the same
#if ENABLE_GETOPT_LONG
	applet_long_options = arg_options;
#endif
	opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v",
		&str_c, &str_V, &str_h, &str_h, &str_F,
		&client_config.interface, &client_config.pidfile, &str_r,
		&client_config.script, &str_T, &str_t
		);

	if (opt & OPT_c)
		client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
	if (opt & OPT_C)
		no_clientid = 1;
	if (opt & OPT_V)
		client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0);
	if (opt & OPT_f)
		client_config.foreground = 1;
	if (opt & OPT_b)
		client_config.background_if_no_lease = 1;
	if (opt & OPT_h)
		client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0);
	if (opt & OPT_F) {
		client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3);
		/* Flags: 0000NEOS
		S: 1 => Client requests Server to update A RR in DNS as well as PTR
		O: 1 => Server indicates to client that DNS has been updated regardless
		E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
		N: 1 => Client requests Server to not update DNS
		*/
		client_config.fqdn[OPT_DATA + 0] = 0x1;
		/* client_config.fqdn[OPT_DATA + 1] = 0; - redundant */
		/* client_config.fqdn[OPT_DATA + 2] = 0; - redundant */
	}
	// if (opt & OPT_i) client_config.interface = ...
	if (opt & OPT_n)
		client_config.abort_if_no_lease = 1;
	// if (opt & OPT_p) client_config.pidfile = ...
	if (opt & OPT_q)
		client_config.quit_after_lease = 1;
	if (opt & OPT_R)
		client_config.release_on_quit = 1;
	if (opt & OPT_r)
		requested_ip = inet_addr(str_r);
	// if (opt & OPT_s) client_config.script = ...
	if (opt & OPT_T)
		client_config.timeout = xatoi_u(str_T);
	if (opt & OPT_t)
		client_config.retries = xatoi_u(str_t);
	if (opt & OPT_v) {
		printf("version %s\n\n", BB_VER);
		return 0;
	}

	if (ENABLE_FEATURE_UDHCP_SYSLOG) {
		openlog(applet_name, LOG_PID, LOG_LOCAL0);
		logmode |= LOGMODE_SYSLOG;
	}

	if (read_interface(client_config.interface, &client_config.ifindex,
			   NULL, client_config.arp) < 0)
		return 1;

	/* Sanitize fd's and write pidfile */
	udhcp_make_pidfile(client_config.pidfile);

	/* if not set, and not suppressed, setup the default client ID */
	if (!client_config.clientid && !no_clientid) {
		client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
		client_config.clientid[OPT_DATA] = 1;
		memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);
	}

	if (!client_config.vendorclass)
		client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);

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

	state = INIT_SELECTING;
	udhcp_run_script(NULL, "deconfig");
	change_mode(LISTEN_RAW);

	for (;;) {
		tv.tv_sec = timeout - uptime();
		tv.tv_usec = 0;

		if (listen_mode != LISTEN_NONE && sockfd < 0) {
			if (listen_mode == LISTEN_KERNEL)
				sockfd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
			else
				sockfd = raw_socket(client_config.ifindex);
		}
		max_fd = udhcp_sp_fd_set(&rfds, sockfd);

		if (tv.tv_sec > 0) {
			DEBUG("Waiting on select...");
			retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
		} else retval = 0; /* If we already timed out, fall through */

		now = uptime();
		if (retval == 0) {
			/* timeout dropped to zero */
			switch (state) {
			case INIT_SELECTING:
				if (packet_num < client_config.retries) {
					if (packet_num == 0)
						xid = random_xid();

					/* send discover packet */
					send_discover(xid, requested_ip); /* broadcast */

					timeout = now + client_config.timeout;
					packet_num++;
				} else {
					udhcp_run_script(NULL, "leasefail");
					if (client_config.background_if_no_lease) {
						bb_info_msg("No lease, forking to background");
						client_background();
					} else if (client_config.abort_if_no_lease) {
						bb_info_msg("No lease, failing");
						retval = 1;
						goto ret;
					}
					/* wait to try again */
					packet_num = 0;
					timeout = now + 60;
				}
				break;
			case RENEW_REQUESTED:
			case REQUESTING:
				if (packet_num < client_config.retries) {
					/* 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 */
					if (state == RENEW_REQUESTED)
						udhcp_run_script(NULL, "deconfig");
					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("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("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;
					bb_info_msg("Lease lost, entering init state");
					udhcp_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(sockfd, &rfds)) {
			/* a packet is ready, read it */

			if (listen_mode == LISTEN_KERNEL)
				len = udhcp_get_packet(&packet, sockfd);
			else len = get_raw_packet(&packet, sockfd);

			if (len == -1 && errno != EINTR) {
				DEBUG("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("Ignoring XID %lx (our xid is %lx)",
					(unsigned long) packet.xid, xid);
				continue;
			}

			/* Ignore packets that aren't for us */
			if (memcmp(packet.chaddr, client_config.arp, 6)) {
				DEBUG("Packet does not have our chaddr - ignoring");
				continue;
			}

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

			switch (state) {
			case INIT_SELECTING:
				/* Must be a DHCPOFFER to one of our xid's */
				if (*message == DHCPOFFER) {
					temp = get_option(&packet, DHCP_SERVER_ID);
					if (temp) {
						/* can be misaligned, thus memcpy */
						memcpy(&server_addr, temp, 4);
						xid = packet.xid;
						requested_ip = packet.yiaddr;

						/* enter requesting state */
						state = REQUESTING;
						timeout = now;
						packet_num = 0;
					} else {
						bb_error_msg("no server ID in message");
					}
				}
				break;
			case RENEW_REQUESTED:
			case REQUESTING:
			case RENEWING:
			case REBINDING:
				if (*message == DHCPACK) {
					temp = get_option(&packet, DHCP_LEASE_TIME);
					if (!temp) {
						bb_error_msg("no lease time with ACK, using 1 hour lease");
						lease = 60 * 60;
					} else {
						/* can be misaligned, thus memcpy */
						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;
					bb_info_msg("Lease of %s obtained, lease time %ld",
						inet_ntoa(temp_addr), lease);
					start = now;
					timeout = t1 + start;
					requested_ip = packet.yiaddr;
					udhcp_run_script(&packet,
						   ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));

					state = BOUND;
					change_mode(LISTEN_NONE);
					if (client_config.quit_after_lease) {
						if (client_config.release_on_quit)
							perform_release();
						goto ret0;
					}
					if (!client_config.foreground)
						client_background();

				} else if (*message == DHCPNAK) {
					/* return to init state */
					bb_info_msg("Received DHCP NAK");
					udhcp_run_script(&packet, "nak");
					if (state != REQUESTING)
						udhcp_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 > 0 && (sig = udhcp_sp_read(&rfds))) {
Ejemplo n.º 4
0
int udhcpc_main(int argc, char *argv[])
{
	uint8_t *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;
	long now;
	int max_fd;
	int sig;
	int no_clientid = 0;

	static const struct option arg_options[] = {
		{"clientid",	required_argument,	0, 'c'},
		{"clientid-none", no_argument,		0, 'C'},
		{"vendorclass",	required_argument,	0, 'V'},
		{"foreground",	no_argument,		0, 'f'},
		{"background",	no_argument,		0, 'b'},
		{"hostname",	required_argument,	0, 'H'},
		{"hostname",	required_argument,	0, 'h'},
		{"fqdn",	required_argument,	0, 'F'},
		{"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'},
		{"timeout",	required_argument,	0, 'T'},
		{"version",	no_argument,		0, 'v'},
		{"retries",	required_argument,	0, 't'},
		{0, 0, 0, 0}
	};

	/* get options */
	while (1) {
		int option_index = 0;
		c = getopt_long(argc, argv, "c:CV:fbH:h:F:i:np:qr:s:T:t:v", arg_options, &option_index);
		if (c == -1) break;

		switch (c) {
		case 'c':
			if (no_clientid) bb_show_usage();
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			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((char*)client_config.clientid + OPT_DATA, optarg, len);
			break;
		case 'C':
			if (client_config.clientid) bb_show_usage();
			no_clientid = 1;
			break;
		case 'V':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			free(client_config.vendorclass);
			client_config.vendorclass = xmalloc(len + 2);
			client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
			client_config.vendorclass[OPT_LEN] = len;
			strncpy((char*)client_config.vendorclass + OPT_DATA, optarg, len);
			break;
		case 'f':
			client_config.foreground = 1;
			break;
		case 'b':
			client_config.background_if_no_lease = 1;
			break;
		case 'h':
		case 'H':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			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((char*)client_config.hostname + 2, optarg, len);
			break;
		case 'F':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			free(client_config.fqdn);
			client_config.fqdn = xmalloc(len + 5);
			client_config.fqdn[OPT_CODE] = DHCP_FQDN;
			client_config.fqdn[OPT_LEN] = len + 3;
			/* Flags: 0000NEOS
			S: 1 => Client requests Server to update A RR in DNS as well as PTR
			O: 1 => Server indicates to client that DNS has been updated regardless
			E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
			N: 1 => Client requests Server to not update DNS
			*/
			client_config.fqdn[OPT_LEN + 1] = 0x1;
			client_config.fqdn[OPT_LEN + 2] = 0;
			client_config.fqdn[OPT_LEN + 3] = 0;
			strncpy((char*)client_config.fqdn + 5, 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 'T':
			client_config.timeout = atoi(optarg);
			break;
		case 't':
			client_config.retries = atoi(optarg);
			break;
		case 'v':
			printf("version %s\n\n", BB_VER);
			return 0;
			break;
		default:
			bb_show_usage();
		}
	}

	/* Start the log, sanitize fd's, and write a pid file */
	udhcp_start_log_and_pid("udhcpc", client_config.pidfile);

	if (read_interface(client_config.interface, &client_config.ifindex,
			   NULL, client_config.arp) < 0)
		return 1;

	/* if not set, and not suppressed, setup the default client ID */
	if (!client_config.clientid && !no_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);
	}

	if (!client_config.vendorclass) {
		client_config.vendorclass = xmalloc(sizeof("udhcp "BB_VER) + 2);
		client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
		client_config.vendorclass[OPT_LEN] = sizeof("udhcp "BB_VER) - 1;
		client_config.vendorclass[OPT_DATA] = 1;
		memcpy(&client_config.vendorclass[OPT_DATA],
			"udhcp "BB_VER, sizeof("udhcp "BB_VER) - 1);
	}


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

	state = INIT_SELECTING;
	udhcp_run_script(NULL, "deconfig");
	change_mode(LISTEN_RAW);

	for (;;) {

		tv.tv_sec = timeout - uptime();
		tv.tv_usec = 0;

		if (listen_mode != LISTEN_NONE && fd < 0) {
			if (listen_mode == LISTEN_KERNEL)
				fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
			else
				fd = raw_socket(client_config.ifindex);
			if (fd < 0) {
				LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
				return 0;
			}
		}
		max_fd = udhcp_sp_fd_set(&rfds, fd);

		if (tv.tv_sec > 0) {
			DEBUG(LOG_INFO, "Waiting on select...");
			retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
		} else retval = 0; /* If we already timed out, fall through */

		now = uptime();
		if (retval == 0) {
			/* timeout dropped to zero */
			switch (state) {
			case INIT_SELECTING:
				if (packet_num < client_config.retries) {
					if (packet_num == 0)
						xid = random_xid();

					/* send discover packet */
					send_discover(xid, requested_ip); /* broadcast */

					timeout = now + client_config.timeout;
					packet_num++;
				} else {
					udhcp_run_script(NULL, "leasefail");
					if (client_config.background_if_no_lease) {
						LOG(LOG_INFO, "No lease, forking to background.");
						client_background();
					} else if (client_config.abort_if_no_lease) {
						LOG(LOG_INFO, "No lease, failing.");
						return 1;
					}
					/* wait to try again */
					packet_num = 0;
					timeout = now + 60;
				}
				break;
			case RENEW_REQUESTED:
			case REQUESTING:
				if (packet_num < client_config.retries) {
					/* 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 */
					if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
					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");
					udhcp_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, &rfds)) {
			/* a packet is ready, read it */

			if (listen_mode == LISTEN_KERNEL)
				len = udhcp_get_packet(&packet, fd);
			else len = get_raw_packet(&packet, fd);

			if (len == -1 && errno != EINTR) {
				DEBUG(LOG_INFO, "error on read, %m, reopening socket");
				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;
			}

			/* Ignore packets that aren't for us */
			if (memcmp(packet.chaddr, client_config.arp, 6)) {
				DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
				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;
					udhcp_run_script(&packet,
						   ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));

					state = BOUND;
					change_mode(LISTEN_NONE);
					if (client_config.quit_after_lease)
						return 0;
					if (!client_config.foreground)
						client_background();

				} else if (*message == DHCPNAK) {
					/* return to init state */
					LOG(LOG_INFO, "Received DHCP NAK");
					udhcp_run_script(&packet, "nak");
					if (state != REQUESTING)
						udhcp_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 > 0 && (sig = udhcp_sp_read(&rfds))) {
Ejemplo n.º 5
0
int main(int argc, char *argv[])
#endif
{
	uint8_t *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;
	long now;
	int max_fd;
	int sig;
	int no_clientid = 0;
	int fail_times = 0;		/* how many times that we fail to find a dhcp server */
	int server_unicast = 0;		


	static const struct option arg_options[] = {
		{"clientid",	required_argument,	0, 'c'},
		{"clientid-none", no_argument,		0, 'C'},
		{"foreground",	no_argument,		0, 'f'},
		{"background",	no_argument,		0, 'b'},
		{"hostname",	required_argument,	0, 'H'},
		{"hostname",    required_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'},
		{"unicast",	no_argument,		0, 'u'},	/* unicast flag */
		{"version",	no_argument,		0, 'v'},
		{0, 0, 0, 0}
	};

	/* get options */
	while (1) {
		int option_index = 0;
		c = getopt_long(argc, argv, "c:CfbH:h:i:np:qr:s:uv", arg_options, &option_index);
		if (c == -1) break;

		switch (c) {
		case 'c':
			if (no_clientid) show_usage();
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			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 + OPT_DATA, optarg, len);
			break;
		case 'C':
			if (client_config.clientid) show_usage();
			no_clientid = 1;
			break;
		case 'f':
			client_config.foreground = 1;
			break;
		case 'b':
			client_config.background_if_no_lease = 1;
			break;
		case 'h':
		case 'H':
			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
			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 'u':
			server_unicast = 1;
			break;
		case 'v':
			printf("udhcpcd, version %s\n\n", VERSION);
			return 0;
			break;
		default:
			show_usage();
		}
	}

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

	if (read_interface(client_config.interface, &client_config.ifindex,
			   NULL, client_config.arp) < 0)
		return 1;

	/* if not set, and not suppressed, setup the default client ID */
	if (!client_config.clientid && !no_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);
	}

	/* changed by lsz 070621 */
	client_background();
	
	/* setup the signal pipe */
	udhcp_sp_setup();

	//if (dhcpc_shm_init() != 0)
	//	return -1;
	#include "msgq.h"
	dhcp_ipc_fork(DHCPC);

	state = INIT_SELECTING;
	run_script(NULL, "deconfig");
	change_mode(LISTEN_RAW);

	for (;;) {
		tv.tv_sec = timeout - uptime();
		tv.tv_usec = 0;

		if (listen_mode != LISTEN_NONE && fd < 0) {
			if (listen_mode == LISTEN_KERNEL)
				fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
			else
				fd = raw_socket(client_config.ifindex);
			if (fd < 0) {
				LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
				return 0;
			}
		}
		
        /* 
         * select don't return when timeout value is larger than 1.5 hours
         * we just wait multiple times
         * added by tiger 090819, should fix later
         */
        struct timeval tp_timeout;
        #define TP_TIMEOUT_MAX  (30*60)
        
		if (tv.tv_sec > 0) 
		{
            do
            {
                max_fd = udhcp_sp_fd_set(&rfds, fd);
                
                tp_timeout.tv_sec = (tv.tv_sec > TP_TIMEOUT_MAX) ? TP_TIMEOUT_MAX : tv.tv_sec;
                tv.tv_sec -= tp_timeout.tv_sec;                                
                tp_timeout.tv_usec = 0;

                retval = select(max_fd + 1, &rfds, NULL, NULL, &tp_timeout);                
                
            } while (tv.tv_sec > 0 && retval == 0);
		}
		else
		{
			retval = 0; /* If we already timed out, fall through */
		}
        
		now = uptime();
		if (retval == 0) {
			/* timeout dropped to zero */
			switch (state) {
			case INIT_SELECTING:
               
#define     DISCOVER_RETRY_TIMES    5
#define     DISCOVER_INVERT_TIMES   3

				if (packet_num < DISCOVER_RETRY_TIMES) {
					if (packet_num == 0)
					{
						xid = random_xid();
                        /* use user config dhcp flags when first discover, added by tiger 20090821 */
                        if (server_unicast)
                        {
                            set_runtime_dhcp_flags(DHCP_FLAGS_UNICAST);
                        }
                        else
                        {
                            set_runtime_dhcp_flags(DHCP_FLAGS_BROADCAST);                            
                        }
					}

                    /* change runtime dhcp flags when exceed DISCOVER_INVERT_TIMES added by tiger 20090819 apply 11G and XP's option */
                    if (DISCOVER_INVERT_TIMES == packet_num)
                    {                        
                        invert_runtime_dhcp_flags();
                    }
                    
					/* send discover packet */
					//send_discover(xid, requested_ip, server_unicast); /* broadcast */
					/* modified by tiger 20090304, reply mode's setting way changed */
					send_discover(xid, requested_ip);
					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send DISCOVER with request ip %X and unicast flag %d", requested_ip, get_runtime_dhcp_flags());                    
                    
					timeout = now + ((packet_num == 2) ? 4 : 2);
					packet_num++;
				} else {
					run_script(NULL, "leasefail");
					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC DHCP Service unavailable, recv no OFFER");
					if (client_config.background_if_no_lease) {
						LOG(LOG_INFO, "No lease, forking to background.");
						client_background();
					} else if (client_config.abort_if_no_lease) {
						LOG(LOG_INFO, "No lease, failing.");
						return 1;
				  	}
					/* wait to try again */
					packet_num = 0;
					
					timeout = now + 10 + (fail_times ++) * 30;	
					/* 60->6000, we dont need to try again -- lsz, 080722 */
					/* 6000->30*fail_times -- lsz, 081008 */
				}
				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 */
					}

					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send REQUEST to server %x with request ip %x", server_addr, requested_ip);

					timeout = now + ((packet_num == 2) ? 10 : 2);
					packet_num++;
				} else {
					/* timed out, go back to init state */
					if (state == RENEW_REQUESTED) run_script(NULL, "deconfig");
					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 */

					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send REQUEST to server %x with request ip %x", server_addr, requested_ip);
              
					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 */

					
					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Broadcast REQUEST with request ip %x", requested_ip);
					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, &rfds)) {
			/* a packet is ready, read it */
			if (listen_mode == LISTEN_KERNEL)
				len = get_packet(&packet, fd);
			else len = get_raw_packet(&packet, fd);

			if (len == -1 && errno != EINTR) {
				DEBUG(LOG_INFO, "error on read, %m, reopening socket");
				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;
			}
			/* Ignore packets that aren't for us */
			if (memcmp(packet.chaddr, client_config.arp, 6)) {
				DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
				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;

						msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv OFFER from server %x with ip %x", server_addr, requested_ip);

						/* 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);
					}

/* RFC 2131 3.1 paragraph 5:
 * "The client receives the DHCPACK message with configuration
 * parameters. The client SHOULD perform a final check on the
 * parameters (e.g., ARP for allocated network address), and notes
 * the duration of the lease specified in the DHCPACK message. At this
 * point, the client is configured. If the client detects that the
 * address is already in use (e.g., through the use of ARP),
 * the client MUST send a DHCPDECLINE message to the server and restarts
 * the configuration process..." 
 * added by tiger 20090827
 */                    
					if (!arpping(packet.yiaddr,
						    (uint32_t) 0,
						    packet.yiaddr,
						    client_config.arp,
						    client_config.interface)
					) {
					
						msglogd (LOG_INFO, LOGTYPE_DHCP, "DHCPC: offered address is in use "
							"(got ARP reply), Send decline");
						send_decline(xid, server_addr, packet.yiaddr);

						if (state != REQUESTING)
							run_script(NULL, "deconfig");
						change_mode(LISTEN_RAW);
						state = INIT_SELECTING;
						requested_ip = 0;
						timeout = now + 12;
						packet_num = 0;
						continue; /* back to main loop */
					}
                    
					/* 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;

					if ((temp = get_option(&packet, DHCP_SERVER_ID))) 
						memcpy(&server_addr, temp, 4);
					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv ACK from server %x with ip %x lease time %ld", 
						server_addr, requested_ip, lease);
					
					run_script(&packet,
						   ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));

					fail_times = 0;		/* clear the retry counter */
					state = BOUND;
					change_mode(LISTEN_NONE);
					if (client_config.quit_after_lease)
						return 0;
					if (!client_config.foreground)
						client_background();

				} else if (*message == DHCPNAK) {
					/* return to init state */
					LOG(LOG_INFO, "Received DHCP NAK");

					if ((temp = get_option(&packet, DHCP_SERVER_ID))) 
						memcpy(&server_addr, temp, 4);
					msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv NAK from server %x with ip %x", server_addr, requested_ip);

					run_script(&packet, "nak");
					if (state != REQUESTING)
						run_script(NULL, "deconfig");
					state = INIT_SELECTING;
					timeout = now + 3;	/* change by lsz 080905, without this 3 seconds,
										 * the udhcpc will keep on trying and the release
										 * msg cant be recved by udhcpc, even if we are
										 * wan static ip now, the udhcpc is still sending 
										 * discover pkts. 
										 */
					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 > 0 && (sig = udhcp_sp_read(&rfds))) {