Diff of /trunk/mkinitrd-magellan/busybox/networking/udhcp/dhcpc.c

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	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 7	Line 7
7	*	*
8	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
9	*/	*/
10	#include <syslog.h>	#include <syslog.h>
11	/* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */	/* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */
12	#define WANT_PIDFILE 1	#define WANT_PIDFILE 1
13	#include "common.h"	#include "common.h"
#	Line 20	Line 18
18
19	static int sockfd = -1;	static int sockfd = -1;
20
21	#define LISTEN_NONE 0	#define LISTEN_NONE   0
22	#define LISTEN_KERNEL 1	#define LISTEN_KERNEL 1
23	#define LISTEN_RAW 2	#define LISTEN_RAW    2
24	static smallint listen_mode;	static smallint listen_mode;
25
26		/* initial state: (re)start DHCP negotiation */
27	#define INIT_SELECTING  0	#define INIT_SELECTING  0
28		/* discover was sent, DHCPOFFER reply received */
29	#define REQUESTING      1	#define REQUESTING      1
30		/* select/renew was sent, DHCPACK reply received */
31	#define BOUND           2	#define BOUND           2
32		/* half of lease passed, want to renew it by sending unicast renew requests */
33	#define RENEWING        3	#define RENEWING        3
34		/* renew requests were not answered, lease is almost over, send broadcast renew */
35	#define REBINDING       4	#define REBINDING       4
36	#define INIT_REBOOT     5	/* manually requested renew (SIGUSR1) */
37	#define RENEW_REQUESTED 6	#define RENEW_REQUESTED 5
38	#define RELEASED        7	/* release, possibly manually requested (SIGUSR2) */
39		#define RELEASED        6
40	static smallint state;	static smallint state;
41
42	/* struct client_config_t client_config is in bb_common_bufsiz1 */	/* struct client_config_t client_config is in bb_common_bufsiz1 */
#	Line 41  static smallint state;	Line 45  static smallint state;
45	/* just a little helper */	/* just a little helper */
46	static void change_listen_mode(int new_mode)	static void change_listen_mode(int new_mode)
47	{	{
48	DEBUG("entering %s listen mode",	log1("Entering listen mode: %s",
49	new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");	new_mode != LISTEN_NONE
50		? (new_mode == LISTEN_KERNEL ? "kernel" : "raw")
51		: "none"
52		);
53
54		listen_mode = new_mode;
55	if (sockfd >= 0) {	if (sockfd >= 0) {
56	close(sockfd);	close(sockfd);
57	sockfd = -1;	sockfd = -1;
58	}	}
59	listen_mode = new_mode;	if (new_mode == LISTEN_KERNEL)
60		sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
61		else if (new_mode != LISTEN_NONE)
62		sockfd = udhcp_raw_socket(client_config.ifindex);
63		/* else LISTEN_NONE: sockfd stay closed */
64	}	}
65
66
#	Line 127  int udhcpc_main(int argc UNUSED_PARAM, c	Line 140  int udhcpc_main(int argc UNUSED_PARAM, c
140	{	{
141	uint8_t *temp, *message;	uint8_t *temp, *message;
142	char *str_c, *str_V, *str_h, *str_F, *str_r;	char *str_c, *str_V, *str_h, *str_F, *str_r;
143	USE_FEATURE_UDHCP_PORT(char *str_P;)	IF_FEATURE_UDHCP_PORT(char *str_P;)
144	llist_t *list_O = NULL;	llist_t *list_O = NULL;
145	int tryagain_timeout = 20;	int tryagain_timeout = 20;
146	int discover_timeout = 3;	int discover_timeout = 3;
#	Line 143  int udhcpc_main(int argc UNUSED_PARAM, c	Line 156  int udhcpc_main(int argc UNUSED_PARAM, c
156	int max_fd;	int max_fd;
157	int retval;	int retval;
158	struct timeval tv;	struct timeval tv;
159	struct dhcpMessage packet;	struct dhcp_packet packet;
160	fd_set rfds;	fd_set rfds;
161
162	#if ENABLE_GETOPT_LONG	#if ENABLE_LONG_OPTS
163	static const char udhcpc_longopts[] ALIGN1 =	static const char udhcpc_longopts[] ALIGN1 =
164	"clientid\0"       Required_argument "c"	"clientid\0"       Required_argument "c"
165	"clientid-none\0"  No_argument       "C"	"clientid-none\0"  No_argument       "C"
#	Line 169  int udhcpc_main(int argc UNUSED_PARAM, c	Line 182  int udhcpc_main(int argc UNUSED_PARAM, c
182	"no-default-options\0" No_argument   "o"	"no-default-options\0" No_argument   "o"
183	"foreground\0"     No_argument       "f"	"foreground\0"     No_argument       "f"
184	"background\0"     No_argument       "b"	"background\0"     No_argument       "b"
185	USE_FEATURE_UDHCPC_ARPING("arping\0" No_argument       "a")	IF_FEATURE_UDHCPC_ARPING("arping\0" No_argument       "a")
186	USE_FEATURE_UDHCP_PORT("client-port\0" Required_argument "P")	IF_FEATURE_UDHCP_PORT("client-port\0" Required_argument "P")
187	;	;
188	#endif	#endif
189	enum {	enum {
#	Line 189  int udhcpc_main(int argc UNUSED_PARAM, c	Line 202  int udhcpc_main(int argc UNUSED_PARAM, c
202	OPT_s = 1 << 12,	OPT_s = 1 << 12,
203	OPT_T = 1 << 13,	OPT_T = 1 << 13,
204	OPT_t = 1 << 14,	OPT_t = 1 << 14,
205	OPT_v = 1 << 15,	OPT_S = 1 << 15,
206	OPT_S = 1 << 16,	OPT_A = 1 << 16,
207	OPT_A = 1 << 17,	OPT_O = 1 << 17,
208	OPT_O = 1 << 18,	OPT_o = 1 << 18,
209	OPT_o = 1 << 19,	OPT_f = 1 << 19,
	OPT_f = 1 << 20,
210	/* The rest has variable bit positions, need to be clever */	/* The rest has variable bit positions, need to be clever */
211	OPTBIT_f = 20,	OPTBIT_f = 19,
212	USE_FOR_MMU(              OPTBIT_b,)	USE_FOR_MMU(             OPTBIT_b,)
213	USE_FEATURE_UDHCPC_ARPING(OPTBIT_a,)	IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,)
214	USE_FEATURE_UDHCP_PORT(   OPTBIT_P,)	IF_FEATURE_UDHCP_PORT(   OPTBIT_P,)
215	USE_FOR_MMU(              OPT_b = 1 << OPTBIT_b,)	USE_FOR_MMU(             OPT_b = 1 << OPTBIT_b,)
216	USE_FEATURE_UDHCPC_ARPING(OPT_a = 1 << OPTBIT_a,)	IF_FEATURE_UDHCPC_ARPING(OPT_a = 1 << OPTBIT_a,)
217	USE_FEATURE_UDHCP_PORT(   OPT_P = 1 << OPTBIT_P,)	IF_FEATURE_UDHCP_PORT(   OPT_P = 1 << OPTBIT_P,)
218	};	};
219
220	/* Default options. */	/* Default options. */
221	USE_FEATURE_UDHCP_PORT(SERVER_PORT = 67;)	IF_FEATURE_UDHCP_PORT(SERVER_PORT = 67;)
222	USE_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;)	IF_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;)
223	client_config.interface = "eth0";	client_config.interface = "eth0";
224	client_config.script = DEFAULT_SCRIPT;	client_config.script = DEFAULT_SCRIPT;
225
226	/* Parse command line */	/* Parse command line */
227	/* Cc: mutually exclusive; O: list; -T,-t,-A take numeric param */	/* Cc: mutually exclusive; O: list; -T,-t,-A take numeric param */
228	opt_complementary = "c--C:C--c:O::T+:t+:A+";	opt_complementary = "c--C:C--c:O::T+:t+:A+"
229	USE_GETOPT_LONG(applet_long_options = udhcpc_longopts;)	#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
230	opt = getopt32(argv, "c:CV:H:h:F:i:np:qRr:s:T:t:vSA:O:of"	":vv"
231		#endif
232		;
233		IF_LONG_OPTS(applet_long_options = udhcpc_longopts;)
234		opt = getopt32(argv, "c:CV:H:h:F:i:np:qRr:s:T:t:SA:O:of"
235	USE_FOR_MMU("b")	USE_FOR_MMU("b")
236	USE_FEATURE_UDHCPC_ARPING("a")	IF_FEATURE_UDHCPC_ARPING("a")
237	USE_FEATURE_UDHCP_PORT("P:")	IF_FEATURE_UDHCP_PORT("P:")
238		"v"
239	, &str_c, &str_V, &str_h, &str_h, &str_F	, &str_c, &str_V, &str_h, &str_h, &str_F
240	, &client_config.interface, &client_config.pidfile, &str_r /* i,p */	, &client_config.interface, &client_config.pidfile, &str_r /* i,p */
241	, &client_config.script /* s */	, &client_config.script /* s */
242	, &discover_timeout, &discover_retries, &tryagain_timeout /* T,t,A */	, &discover_timeout, &discover_retries, &tryagain_timeout /* T,t,A */
243	, &list_O	, &list_O
244	USE_FEATURE_UDHCP_PORT(, &str_P)	IF_FEATURE_UDHCP_PORT(, &str_P)
245		#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
246		, &dhcp_verbose
247		#endif
248	);	);
249	if (opt & OPT_c)	if (opt & OPT_c)
250	client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);	client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
#	Line 246  int udhcpc_main(int argc UNUSED_PARAM, c	Line 266  int udhcpc_main(int argc UNUSED_PARAM, c
266	}	}
267	if (opt & OPT_r)	if (opt & OPT_r)
268	requested_ip = inet_addr(str_r);	requested_ip = inet_addr(str_r);
	if (opt & OPT_v) {
	puts("version "BB_VER);
	return 0;
	}
269	#if ENABLE_FEATURE_UDHCP_PORT	#if ENABLE_FEATURE_UDHCP_PORT
270	if (opt & OPT_P) {	if (opt & OPT_P) {
271	CLIENT_PORT = xatou16(str_P);	CLIENT_PORT = xatou16(str_P);
#	Line 267  int udhcpc_main(int argc UNUSED_PARAM, c	Line 283  int udhcpc_main(int argc UNUSED_PARAM, c
283	client_config.opt_mask[n >> 3] |= 1 << (n & 7);	client_config.opt_mask[n >> 3] |= 1 << (n & 7);
284	}	}
285
286	if (udhcp_read_interface(client_config.interface, &client_config.ifindex,	if (udhcp_read_interface(client_config.interface,
287	NULL, client_config.arp))	&client_config.ifindex,
288		NULL,
289		client_config.client_mac)
290		) {
291	return 1;	return 1;
292		}
293
294	#if !BB_MMU	#if !BB_MMU
295	/* on NOMMU reexec (i.e., background) early */	/* on NOMMU reexec (i.e., background) early */
296	if (!(opt & OPT_f)) {	if (!(opt & OPT_f)) {
297	bb_daemonize_or_rexec(0 /* flags */, argv);	bb_daemonize_or_rexec(0 /* flags */, argv);
298	logmode = 0;	logmode = LOGMODE_NONE;
299	}	}
300	#endif	#endif
301	if (opt & OPT_S) {	if (opt & OPT_S) {
302	openlog(applet_name, LOG_PID, LOG_LOCAL0);	openlog(applet_name, LOG_PID, LOG_DAEMON);
303	logmode |= LOGMODE_SYSLOG;	logmode |= LOGMODE_SYSLOG;
304	}	}
305
#	Line 293  int udhcpc_main(int argc UNUSED_PARAM, c	Line 314  int udhcpc_main(int argc UNUSED_PARAM, c
314	/* Goes to stdout (unless NOMMU) and possibly syslog */	/* Goes to stdout (unless NOMMU) and possibly syslog */
315	bb_info_msg("%s (v"BB_VER") started", applet_name);	bb_info_msg("%s (v"BB_VER") started", applet_name);
316
317	/* if not set, and not suppressed, setup the default client ID */	/* If not set, and not suppressed, set up the default client ID */
318	if (!client_config.clientid && !(opt & OPT_C)) {	if (!client_config.clientid && !(opt & OPT_C)) {
319	client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);	client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
320	client_config.clientid[OPT_DATA] = 1;	client_config.clientid[OPT_DATA] = 1;
321	memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);	memcpy(client_config.clientid + OPT_DATA+1, client_config.client_mac, 6);
322	}	}
323
324	if (!client_config.vendorclass)	if (!client_config.vendorclass)
325	client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);	client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);
326
327	/* setup the signal pipe */	/* Set up the signal pipe */
328	udhcp_sp_setup();	udhcp_sp_setup();
329
330	state = INIT_SELECTING;	state = INIT_SELECTING;
#	Line 318  int udhcpc_main(int argc UNUSED_PARAM, c	Line 339  int udhcpc_main(int argc UNUSED_PARAM, c
339	* "continue" statements in code below jump to the top of the loop.	* "continue" statements in code below jump to the top of the loop.
340	*/	*/
341	for (;;) {	for (;;) {
342	unsigned timestamp_before_wait;	/* silence "uninitialized!" warning */
343		unsigned timestamp_before_wait = timestamp_before_wait;
344
345		//bb_error_msg("sockfd:%d, listen_mode:%d", sockfd, listen_mode);
346
347		/* Was opening raw or udp socket here
348		* if (listen_mode != LISTEN_NONE && sockfd < 0),
349		* but on fast network renew responses return faster
350		* than we open sockets. Thus this code is moved
351		* to change_listen_mode(). Thus we open listen socket
352		* BEFORE we send renew request (see "case BOUND:"). */
353
	if (listen_mode != LISTEN_NONE && sockfd < 0) {
	if (listen_mode == LISTEN_KERNEL)
	sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
	else
	sockfd = udhcp_raw_socket(client_config.ifindex);
	}
354	max_fd = udhcp_sp_fd_set(&rfds, sockfd);	max_fd = udhcp_sp_fd_set(&rfds, sockfd);
355
356	tv.tv_sec = timeout - already_waited_sec;	tv.tv_sec = timeout - already_waited_sec;
357	tv.tv_usec = 0;	tv.tv_usec = 0;
358	retval = 0; /* If we already timed out, fall through, else... */	retval = 0; /* If we already timed out, fall through, else... */
359	if (tv.tv_sec > 0) {	if ((int)tv.tv_sec > 0) {
360	timestamp_before_wait = (unsigned)monotonic_sec();	timestamp_before_wait = (unsigned)monotonic_sec();
361	DEBUG("Waiting on select...");	log1("Waiting on select...");
362	retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);	retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
363	if (retval < 0) {	if (retval < 0) {
364	/* EINTR? A signal was caught, don't panic */	/* EINTR? A signal was caught, don't panic */
365	if (errno == EINTR)	if (errno == EINTR) {
366		already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait;
367	continue;	continue;
368		}
369	/* Else: an error occured, panic! */	/* Else: an error occured, panic! */
370	bb_perror_msg_and_die("select");	bb_perror_msg_and_die("select");
371	}	}
#	Line 356  int udhcpc_main(int argc UNUSED_PARAM, c	Line 383  int udhcpc_main(int argc UNUSED_PARAM, c
383	if (packet_num < discover_retries) {	if (packet_num < discover_retries) {
384	if (packet_num == 0)	if (packet_num == 0)
385	xid = random_xid();	xid = random_xid();
386		/* broadcast */
387	send_discover(xid, requested_ip); /* broadcast */	send_discover(xid, requested_ip);
388	timeout = discover_timeout;	timeout = discover_timeout;
389	packet_num++;	packet_num++;
390	continue;	continue;
#	Line 382  int udhcpc_main(int argc UNUSED_PARAM, c	Line 408  int udhcpc_main(int argc UNUSED_PARAM, c
408	timeout = tryagain_timeout;	timeout = tryagain_timeout;
409	packet_num = 0;	packet_num = 0;
410	continue;	continue;
	case RENEW_REQUESTED:
411	case REQUESTING:	case REQUESTING:
412	if (packet_num < discover_retries) {	if (packet_num < discover_retries) {
413	/* send request packet */	/* send broadcast select packet */
414	if (state == RENEW_REQUESTED) /* unicast */	send_select(xid, server_addr, requested_ip);
	send_renew(xid, server_addr, requested_ip);
	else /* broadcast */
	send_select(xid, server_addr, requested_ip);
415	timeout = discover_timeout;	timeout = discover_timeout;
416	packet_num++;	packet_num++;
417	continue;	continue;
418	}	}
419	/* timed out, go back to init state */	/* Timed out, go back to init state.
420	if (state == RENEW_REQUESTED)	* "discover...select...discover..." loops
	udhcp_run_script(NULL, "deconfig");
	change_listen_mode(LISTEN_RAW);
	/* "discover...select...discover..." loops
421	* were seen in the wild. Treat them similarly	* were seen in the wild. Treat them similarly
422	* to "no response to discover" case */	* to "no response to discover" case */
423	if (state == REQUESTING) {	change_listen_mode(LISTEN_RAW);
	state = INIT_SELECTING;
	goto leasefail;
	}
424	state = INIT_SELECTING;	state = INIT_SELECTING;
425	timeout = 0;	goto leasefail;
	packet_num = 0;
	continue;
426	case BOUND:	case BOUND:
427	/* Half of the lease passed, time to enter renewing state */	/* 1/2 lease passed, enter renewing state */
	change_listen_mode(LISTEN_KERNEL);
	DEBUG("Entering renew state");
428	state = RENEWING;	state = RENEWING;
429		change_listen_mode(LISTEN_KERNEL);
430		log1("Entering renew state");
431	/* fall right through */	/* fall right through */
432		case RENEW_REQUESTED: /* manual (SIGUSR1) renew */
433		case_RENEW_REQUESTED:
434	case RENEWING:	case RENEWING:
435	if (timeout > 60) {	if (timeout > 60) {
436	/* send a request packet */	/* send an unicast renew request */
437	send_renew(xid, server_addr, requested_ip); /* unicast */	/* Sometimes observed to fail (EADDRNOTAVAIL) to bind
438		* a new UDP socket for sending inside send_renew.
439		* I hazard to guess existing listening socket
440		* is somehow conflicting with it, but why is it
441		* not deterministic then?! Strange.
442		* Anyway, it does recover by eventually failing through
443		* into INIT_SELECTING state.
444		*/
445		send_renew(xid, server_addr, requested_ip);
446	timeout >>= 1;	timeout >>= 1;
447	continue;	continue;
448	}	}
449	/* Timed out, enter rebinding state */	/* Timed out, enter rebinding state */
450	DEBUG("Entering rebinding state");	log1("Entering rebinding state");
451	state = REBINDING;	state = REBINDING;
452	/* fall right through */	/* fall right through */
453	case REBINDING:	case REBINDING:
454		/* Switch to bcast receive */
455		change_listen_mode(LISTEN_RAW);
456	/* Lease is *really* about to run out,	/* Lease is *really* about to run out,
457	* try to find DHCP server using broadcast */	* try to find DHCP server using broadcast */
458	if (timeout > 0) {	if (timeout > 0) {
459	/* send a request packet */	/* send a broadcast renew request */
460	send_renew(xid, 0 /* INADDR_ANY*/, requested_ip); /* broadcast */	send_renew(xid, 0 /*INADDR_ANY*/, requested_ip);
461	timeout >>= 1;	timeout >>= 1;
462	continue;	continue;
463	}	}
464	/* Timed out, enter init state */	/* Timed out, enter init state */
465	bb_info_msg("Lease lost, entering init state");	bb_info_msg("Lease lost, entering init state");
466	udhcp_run_script(NULL, "deconfig");	udhcp_run_script(NULL, "deconfig");
	change_listen_mode(LISTEN_RAW);
467	state = INIT_SELECTING;	state = INIT_SELECTING;
468	/*timeout = 0; - already is */	/*timeout = 0; - already is */
469	packet_num = 0;	packet_num = 0;
#	Line 449  int udhcpc_main(int argc UNUSED_PARAM, c	Line 473  int udhcpc_main(int argc UNUSED_PARAM, c
473	/* yah, I know, *you* say it would never happen */	/* yah, I know, *you* say it would never happen */
474	timeout = INT_MAX;	timeout = INT_MAX;
475	continue; /* back to main loop */	continue; /* back to main loop */
476		} /* if select timed out */
477
478		/* select() didn't timeout, something happened */
479
480		/* Is it a signal? */
481		/* note: udhcp_sp_read checks FD_ISSET before reading */
482		switch (udhcp_sp_read(&rfds)) {
483		case SIGUSR1:
484		perform_renew();
485		if (state == RENEW_REQUESTED)
486		goto case_RENEW_REQUESTED;
487		/* Start things over */
488		packet_num = 0;
489		/* Kill any timeouts, user wants this to hurry along */
490		timeout = 0;
491		continue;
492		case SIGUSR2:
493		perform_release(requested_ip, server_addr);
494		timeout = INT_MAX;
495		continue;
496		case SIGTERM:
497		bb_info_msg("Received SIGTERM");
498		if (opt & OPT_R) /* release on quit */
499		perform_release(requested_ip, server_addr);
500		goto ret0;
501	}	}
502
	/* select() didn't timeout, something did happen. */
503	/* Is it a packet? */	/* Is it a packet? */
504	if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {	if (listen_mode == LISTEN_NONE || !FD_ISSET(sockfd, &rfds))
505		continue; /* no */
506
507		{
508	int len;	int len;
	/* A packet is ready, read it */
509
510		/* A packet is ready, read it */
511	if (listen_mode == LISTEN_KERNEL)	if (listen_mode == LISTEN_KERNEL)
512	len = udhcp_recv_kernel_packet(&packet, sockfd);	len = udhcp_recv_kernel_packet(&packet, sockfd);
513	else	else
514	len = udhcp_recv_raw_packet(&packet, sockfd);	len = udhcp_recv_raw_packet(&packet, sockfd);
515	if (len == -1) { /* error is severe, reopen socket */	if (len == -1) {
516	DEBUG("error on read, %s, reopening socket", strerror(errno));	/* Error is severe, reopen socket */
517		bb_info_msg("Read error: %s, reopening socket", strerror(errno));
518	sleep(discover_timeout); /* 3 seconds by default */	sleep(discover_timeout); /* 3 seconds by default */
519	change_listen_mode(listen_mode); /* just close and reopen */	change_listen_mode(listen_mode); /* just close and reopen */
520	}	}
#	Line 472  int udhcpc_main(int argc UNUSED_PARAM, c	Line 524  int udhcpc_main(int argc UNUSED_PARAM, c
524	already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait;	already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait;
525	if (len < 0)	if (len < 0)
526	continue;	continue;
527		}
528
529	if (packet.xid != xid) {	if (packet.xid != xid) {
530	DEBUG("Ignoring xid %x (our xid is %x)",	log1("xid %x (our is %x), ignoring packet",
531	(unsigned)packet.xid, (unsigned)xid);	(unsigned)packet.xid, (unsigned)xid);
532	continue;	continue;
533	}	}
534
535	/* Ignore packets that aren't for us */	/* Ignore packets that aren't for us */
536	if (memcmp(packet.chaddr, client_config.arp, 6)) {	if (packet.hlen != 6
537	DEBUG("Packet does not have our chaddr - ignoring");	|| memcmp(packet.chaddr, client_config.client_mac, 6)
538	continue;	) {
539	}	//FIXME: need to also check that last 10 bytes are zero
540		log1("chaddr does not match, ignoring packet"); // log2?
541		continue;
542		}
543
544	message = get_option(&packet, DHCP_MESSAGE_TYPE);	message = get_option(&packet, DHCP_MESSAGE_TYPE);
545	if (message == NULL) {	if (message == NULL) {
546	bb_error_msg("cannot get message type from packet - ignoring");	bb_error_msg("no message type option, ignoring packet");
547	continue;	continue;
548	}	}
549
550	switch (state) {	switch (state) {
551	case INIT_SELECTING:	case INIT_SELECTING:
552	/* Must be a DHCPOFFER to one of our xid's */	/* Must be a DHCPOFFER to one of our xid's */
553	if (*message == DHCPOFFER) {	if (*message == DHCPOFFER) {
554	/* TODO: why we don't just fetch server's IP from IP header? */	/* TODO: why we don't just fetch server's IP from IP header? */
555	temp = get_option(&packet, DHCP_SERVER_ID);	temp = get_option(&packet, DHCP_SERVER_ID);
556	if (!temp) {	if (!temp) {
557	bb_error_msg("no server ID in message");	bb_error_msg("no server ID in message");
558	continue;	continue;
559	/* still selecting - this server looks bad */	/* still selecting - this server looks bad */
560	}	}
561		/* it IS unaligned sometimes, don't "optimize" */
562		move_from_unaligned32(server_addr, temp);
563		xid = packet.xid;
564		requested_ip = packet.yiaddr;
565
566		/* enter requesting state */
567		state = REQUESTING;
568		timeout = 0;
569		packet_num = 0;
570		already_waited_sec = 0;
571		}
572		continue;
573		case REQUESTING:
574		case RENEWING:
575		case RENEW_REQUESTED:
576		case REBINDING:
577		if (*message == DHCPACK) {
578		temp = get_option(&packet, DHCP_LEASE_TIME);
579		if (!temp) {
580		bb_error_msg("no lease time with ACK, using 1 hour lease");
581		lease_seconds = 60 * 60;
582		} else {
583	/* it IS unaligned sometimes, don't "optimize" */	/* it IS unaligned sometimes, don't "optimize" */
584	server_addr = get_unaligned_u32p((uint32_t*)temp);	move_from_unaligned32(lease_seconds, temp);
585	xid = packet.xid;	lease_seconds = ntohl(lease_seconds);
586	requested_ip = packet.yiaddr;	lease_seconds &= 0x0fffffff; /* paranoia: must not be prone to overflows */
587		if (lease_seconds < 10) /* and not too small */
588	/* enter requesting state */	lease_seconds = 10;
	state = REQUESTING;
	timeout = 0;
	packet_num = 0;
	already_waited_sec = 0;
589	}	}
	continue;
	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_seconds = 60 * 60;
	} else {
	/* it IS unaligned sometimes, don't "optimize" */
	lease_seconds = get_unaligned_u32p((uint32_t*)temp);
	lease_seconds = ntohl(lease_seconds);
	lease_seconds &= 0x0fffffff; /* paranoia: must not be prone to overflows */
	if (lease_seconds < 10) /* and not too small */
	lease_seconds = 10;
	}
590	#if ENABLE_FEATURE_UDHCPC_ARPING	#if ENABLE_FEATURE_UDHCPC_ARPING
591	if (opt & OPT_a) {	if (opt & OPT_a) {
592	/* RFC 2131 3.1 paragraph 5:	/* RFC 2131 3.1 paragraph 5:
593	* "The client receives the DHCPACK message with configuration	* "The client receives the DHCPACK message with configuration
594	* parameters. The client SHOULD perform a final check on the	* parameters. The client SHOULD perform a final check on the
#	Line 542  int udhcpc_main(int argc UNUSED_PARAM, c	Line 598  int udhcpc_main(int argc UNUSED_PARAM, c
598	* address is already in use (e.g., through the use of ARP),	* address is already in use (e.g., through the use of ARP),
599	* the client MUST send a DHCPDECLINE message to the server and restarts	* the client MUST send a DHCPDECLINE message to the server and restarts
600	* the configuration process..." */	* the configuration process..." */
601	if (!arpping(packet.yiaddr,	if (!arpping(packet.yiaddr,
602	(uint32_t) 0,	NULL,
603	client_config.arp,	(uint32_t) 0,
604	client_config.interface)	client_config.client_mac,
605	) {	client_config.interface)
606	bb_info_msg("offered address is in use "	) {
607	"(got ARP reply), declining");	bb_info_msg("Offered address is in use "
608	send_decline(xid, server_addr, packet.yiaddr);	"(got ARP reply), declining");
609		send_decline(xid, server_addr, packet.yiaddr);
610	if (state != REQUESTING)
611	udhcp_run_script(NULL, "deconfig");	if (state != REQUESTING)
612	change_listen_mode(LISTEN_RAW);	udhcp_run_script(NULL, "deconfig");
613	state = INIT_SELECTING;	change_listen_mode(LISTEN_RAW);
614	requested_ip = 0;	state = INIT_SELECTING;
615	timeout = tryagain_timeout;	requested_ip = 0;
616	packet_num = 0;	timeout = tryagain_timeout;
617	already_waited_sec = 0;	packet_num = 0;
618	continue; /* back to main loop */	already_waited_sec = 0;
619	}	continue; /* back to main loop */
	}
	#endif
	/* enter bound state */
	timeout = lease_seconds / 2;
	{
	struct in_addr temp_addr;
	temp_addr.s_addr = packet.yiaddr;
	bb_info_msg("Lease of %s obtained, lease time %u",
	inet_ntoa(temp_addr), (unsigned)lease_seconds);
	}
	requested_ip = packet.yiaddr;
	udhcp_run_script(&packet,
	((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
	state = BOUND;
	change_listen_mode(LISTEN_NONE);
	if (opt & OPT_q) { /* quit after lease */
	if (opt & OPT_R) /* release on quit */
	perform_release(requested_ip, server_addr);
	goto ret0;
	}
	#if BB_MMU /* NOMMU case backgrounded earlier */
	if (!(opt & OPT_f)) {
	client_background();
	/* do not background again! */
	opt = ((opt & ~OPT_b) | OPT_f);
620	}	}
621		}
622	#endif	#endif
623	already_waited_sec = 0;	/* enter bound state */
624	continue; /* back to main loop */	timeout = lease_seconds / 2;
625		{
626		struct in_addr temp_addr;
627		temp_addr.s_addr = packet.yiaddr;
628		bb_info_msg("Lease of %s obtained, lease time %u",
629		inet_ntoa(temp_addr), (unsigned)lease_seconds);
630	}	}
631	if (*message == DHCPNAK) {	requested_ip = packet.yiaddr;
632	/* return to init state */	udhcp_run_script(&packet, state == REQUESTING ? "bound" : "renew");
633	bb_info_msg("Received DHCP NAK");
634	udhcp_run_script(&packet, "nak");	state = BOUND;
635	if (state != REQUESTING)	change_listen_mode(LISTEN_NONE);
636	udhcp_run_script(NULL, "deconfig");	if (opt & OPT_q) { /* quit after lease */
637	change_listen_mode(LISTEN_RAW);	if (opt & OPT_R) /* release on quit */
638	sleep(3); /* avoid excessive network traffic */	perform_release(requested_ip, server_addr);
639	state = INIT_SELECTING;	goto ret0;
	requested_ip = 0;
	timeout = 0;
	packet_num = 0;
	already_waited_sec = 0;
640	}	}
641	continue;	/* future renew failures should not exit (JM) */
642	/* case BOUND, RELEASED: - ignore all packets */	opt &= ~OPT_n;
643		#if BB_MMU /* NOMMU case backgrounded earlier */
644		if (!(opt & OPT_f)) {
645		client_background();
646		/* do not background again! */
647		opt = ((opt & ~OPT_b) | OPT_f);
648		}
649		#endif
650		already_waited_sec = 0;
651		continue; /* back to main loop */
652	}	}
653	continue; /* back to main loop */	if (*message == DHCPNAK) {
654	}	/* return to init state */
655		bb_info_msg("Received DHCP NAK");
656	/* select() didn't timeout, something did happen.	udhcp_run_script(&packet, "nak");
657	* But it wasn't a packet. It's a signal pipe then. */	if (state != REQUESTING)
658	{	udhcp_run_script(NULL, "deconfig");
659	int signo = udhcp_sp_read(&rfds);	change_listen_mode(LISTEN_RAW);
660	switch (signo) {	sleep(3); /* avoid excessive network traffic */
661	case SIGUSR1:	state = INIT_SELECTING;
662	perform_renew();	requested_ip = 0;
	/* start things over */
	packet_num = 0;
	/* Kill any timeouts because the user wants this to hurry along */
663	timeout = 0;	timeout = 0;
664	break;	packet_num = 0;
665	case SIGUSR2:	already_waited_sec = 0;
	perform_release(requested_ip, server_addr);
	timeout = INT_MAX;
	break;
	case SIGTERM:
	bb_info_msg("Received SIGTERM");
	if (opt & OPT_R) /* release on quit */
	perform_release(requested_ip, server_addr);
	goto ret0;
666	}	}
667		continue;
668		/* case BOUND: - ignore all packets */
669		/* case RELEASED: - ignore all packets */
670	}	}
671		/* back to main loop */
672	} /* for (;;) - main loop ends */	} /* for (;;) - main loop ends */
673
674	ret0:	ret0:

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