summaryrefslogtreecommitdiff
path: root/networking/ping.c
blob: e1f9ebc3a239aec01d271f45762994d9ac4aebdd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
/* vi: set sw=4 ts=4: */
/*
 * Mini ping implementation for busybox
 *
 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
 *
 * Adapted from the ping in netkit-base 0.10:
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Mike Muuss.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
/* from ping6.c:
 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
 *
 * This version of ping is adapted from the ping in netkit-base 0.10,
 * which is:
 *
 * Original copyright notice is retained at the end of this file.
 *
 * This version is an adaptation of ping.c from busybox.
 * The code was modified by Bart Visscher <magick@linux-fan.com>
 */

#include <net/if.h>
#include <netinet/ip_icmp.h>
#include "libbb.h"

#ifdef __BIONIC__
/* should be in netinet/ip_icmp.h */
# define ICMP_DEST_UNREACH    3  /* Destination Unreachable  */
# define ICMP_SOURCE_QUENCH   4  /* Source Quench    */
# define ICMP_REDIRECT        5  /* Redirect (change route)  */
# define ICMP_ECHO            8  /* Echo Request      */
# define ICMP_TIME_EXCEEDED  11  /* Time Exceeded    */
# define ICMP_PARAMETERPROB  12  /* Parameter Problem    */
# define ICMP_TIMESTAMP      13  /* Timestamp Request    */
# define ICMP_TIMESTAMPREPLY 14  /* Timestamp Reply    */
# define ICMP_INFO_REQUEST   15  /* Information Request    */
# define ICMP_INFO_REPLY     16  /* Information Reply    */
# define ICMP_ADDRESS        17  /* Address Mask Request    */
# define ICMP_ADDRESSREPLY   18  /* Address Mask Reply    */
#endif

//config:config PING
//config:	bool "ping"
//config:	default y
//config:	select PLATFORM_LINUX
//config:	help
//config:	  ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to
//config:	  elicit an ICMP ECHO_RESPONSE from a host or gateway.
//config:
//config:config PING6
//config:	bool "ping6"
//config:	default y
//config:	depends on FEATURE_IPV6 && PING
//config:	help
//config:	  This will give you a ping that can talk IPv6.
//config:
//config:config FEATURE_FANCY_PING
//config:	bool "Enable fancy ping output"
//config:	default y
//config:	depends on PING
//config:	help
//config:	  Make the output from the ping applet include statistics, and at the
//config:	  same time provide full support for ICMP packets.

/* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */
//applet:IF_PING(APPLET(ping, BB_DIR_BIN, BB_SUID_MAYBE))
//applet:IF_PING6(APPLET(ping6, BB_DIR_BIN, BB_SUID_MAYBE))

//kbuild:lib-$(CONFIG_PING)  += ping.o
//kbuild:lib-$(CONFIG_PING6) += ping.o

//usage:#if !ENABLE_FEATURE_FANCY_PING
//usage:# define ping_trivial_usage
//usage:       "HOST"
//usage:# define ping_full_usage "\n\n"
//usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
//usage:# define ping6_trivial_usage
//usage:       "HOST"
//usage:# define ping6_full_usage "\n\n"
//usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
//usage:#else
//usage:# define ping_trivial_usage
//usage:       "[OPTIONS] HOST"
//usage:# define ping_full_usage "\n\n"
//usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
//usage:	IF_PING6(
//usage:     "\n	-4,-6		Force IP or IPv6 name resolution"
//usage:	)
//usage:     "\n	-c CNT		Send only CNT pings"
//usage:     "\n	-s SIZE		Send SIZE data bytes in packets (default:56)"
//usage:     "\n	-t TTL		Set TTL"
//usage:     "\n	-I IFACE/IP	Use interface or IP address as source"
//usage:     "\n	-W SEC		Seconds to wait for the first response (default:10)"
//usage:     "\n			(after all -c CNT packets are sent)"
//usage:     "\n	-w SEC		Seconds until ping exits (default:infinite)"
//usage:     "\n			(can exit earlier with -c CNT)"
//usage:     "\n	-q		Quiet, only display output at start"
//usage:     "\n			and when finished"
//usage:     "\n	-p		Pattern to use for payload"
//usage:
//usage:# define ping6_trivial_usage
//usage:       "[OPTIONS] HOST"
//usage:# define ping6_full_usage "\n\n"
//usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
//usage:     "\n	-c CNT		Send only CNT pings"
//usage:     "\n	-s SIZE		Send SIZE data bytes in packets (default:56)"
//usage:     "\n	-I IFACE/IP	Use interface or IP address as source"
//usage:     "\n	-q		Quiet, only display output at start"
//usage:     "\n			and when finished"
//usage:     "\n	-p		Pattern to use for payload"
//usage:
//usage:#endif
//usage:
//usage:#define ping_example_usage
//usage:       "$ ping localhost\n"
//usage:       "PING slag (127.0.0.1): 56 data bytes\n"
//usage:       "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
//usage:       "\n"
//usage:       "--- debian ping statistics ---\n"
//usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
//usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
//usage:#define ping6_example_usage
//usage:       "$ ping6 ip6-localhost\n"
//usage:       "PING ip6-localhost (::1): 56 data bytes\n"
//usage:       "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
//usage:       "\n"
//usage:       "--- ip6-localhost ping statistics ---\n"
//usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
//usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"

#if ENABLE_PING6
# include <netinet/icmp6.h>
/* I see RENUMBERED constants in bits/in.h - !!?
 * What a fuck is going on with libc? Is it a glibc joke? */
# ifdef IPV6_2292HOPLIMIT
#  undef IPV6_HOPLIMIT
#  define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
# endif
#endif

enum {
	DEFDATALEN = 56,
	MAXIPLEN = 60,
	MAXICMPLEN = 76,
	MAX_DUP_CHK = (8 * 128),
	MAXWAIT = 10,
	PINGINTERVAL = 1, /* 1 second */
	pingsock = 0,
};

static void
#if ENABLE_PING6
create_icmp_socket(len_and_sockaddr *lsa)
#else
create_icmp_socket(void)
#define create_icmp_socket(lsa) create_icmp_socket()
#endif
{
	int sock;
#if ENABLE_PING6
	if (lsa->u.sa.sa_family == AF_INET6)
		sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
	else
#endif
		sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
	if (sock < 0) {
		if (errno == EPERM)
			bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
		bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
	}

	xmove_fd(sock, pingsock);
}

#if !ENABLE_FEATURE_FANCY_PING

/* Simple version */

struct globals {
	char *hostname;
	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { } while (0)

static void noresp(int ign UNUSED_PARAM)
{
	printf("No response from %s\n", G.hostname);
	exit(EXIT_FAILURE);
}

static void ping4(len_and_sockaddr *lsa)
{
	struct icmp *pkt;
	int c;

	pkt = (struct icmp *) G.packet;
	/*memset(pkt, 0, sizeof(G.packet)); already is */
	pkt->icmp_type = ICMP_ECHO;
	pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet));

	xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);

	/* listen for replies */
	while (1) {
#if 0
		struct sockaddr_in from;
		socklen_t fromlen = sizeof(from);

		c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
				(struct sockaddr *) &from, &fromlen);
#else
		c = recv(pingsock, G.packet, sizeof(G.packet), 0);
#endif
		if (c < 0) {
			if (errno != EINTR)
				bb_perror_msg("recvfrom");
			continue;
		}
		if (c >= 76) {			/* ip + icmp */
			struct iphdr *iphdr = (struct iphdr *) G.packet;

			pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2));	/* skip ip hdr */
			if (pkt->icmp_type == ICMP_ECHOREPLY)
				break;
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		close(pingsock);
}

#if ENABLE_PING6
static void ping6(len_and_sockaddr *lsa)
{
	struct icmp6_hdr *pkt;
	int c;
	int sockopt;

	pkt = (struct icmp6_hdr *) G.packet;
	/*memset(pkt, 0, sizeof(G.packet)); already is */
	pkt->icmp6_type = ICMP6_ECHO_REQUEST;

	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
	setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt);

	xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);

	/* listen for replies */
	while (1) {
#if 0
		struct sockaddr_in6 from;
		socklen_t fromlen = sizeof(from);

		c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
				(struct sockaddr *) &from, &fromlen);
#else
		c = recv(pingsock, G.packet, sizeof(G.packet), 0);
#endif
		if (c < 0) {
			if (errno != EINTR)
				bb_perror_msg("recvfrom");
			continue;
		}
		if (c >= ICMP_MINLEN) {	/* icmp6_hdr */
			if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
				break;
		}
	}
	if (ENABLE_FEATURE_CLEAN_UP)
		close(pingsock);
}
#endif

#if !ENABLE_PING6
# define common_ping_main(af, argv) common_ping_main(argv)
#endif
static int common_ping_main(sa_family_t af, char **argv)
{
	len_and_sockaddr *lsa;

	INIT_G();

#if ENABLE_PING6
	while ((++argv)[0] && argv[0][0] == '-') {
		if (argv[0][1] == '4') {
			af = AF_INET;
			continue;
		}
		if (argv[0][1] == '6') {
			af = AF_INET6;
			continue;
		}
		bb_show_usage();
	}
#else
	argv++;
#endif

	G.hostname = *argv;
	if (!G.hostname)
		bb_show_usage();

#if ENABLE_PING6
	lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
#else
	lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
#endif
	/* Set timer _after_ DNS resolution */
	signal(SIGALRM, noresp);
	alarm(5); /* give the host 5000ms to respond */

	create_icmp_socket(lsa);
#if ENABLE_PING6
	if (lsa->u.sa.sa_family == AF_INET6)
		ping6(lsa);
	else
#endif
		ping4(lsa);
	printf("%s is alive!\n", G.hostname);
	return EXIT_SUCCESS;
}


#else /* FEATURE_FANCY_PING */


/* Full(er) version */

#define OPT_STRING ("qvc:s:t:w:W:I:np:4" IF_PING6("6"))
enum {
	OPT_QUIET = 1 << 0,
	OPT_VERBOSE = 1 << 1,
	OPT_c = 1 << 2,
	OPT_s = 1 << 3,
	OPT_t = 1 << 4,
	OPT_w = 1 << 5,
	OPT_W = 1 << 6,
	OPT_I = 1 << 7,
	/*OPT_n = 1 << 8, - ignored */
	OPT_p = 1 << 9,
	OPT_IPV4 = 1 << 10,
	OPT_IPV6 = (1 << 11) * ENABLE_PING6,
};


struct globals {
	int if_index;
	char *str_I;
	len_and_sockaddr *source_lsa;
	unsigned datalen;
	unsigned pingcount; /* must be int-sized */
	unsigned opt_ttl;
	unsigned long ntransmitted, nreceived, nrepeats;
	uint16_t myid;
	uint8_t pattern;
	unsigned tmin, tmax; /* in us */
	unsigned long long tsum; /* in us, sum of all times */
	unsigned deadline;
	unsigned timeout;
	unsigned total_secs;
	unsigned sizeof_rcv_packet;
	char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
	void *snd_packet; /* [datalen + ipv4/ipv6_const] */
	const char *hostname;
	const char *dotted;
	union {
		struct sockaddr sa;
		struct sockaddr_in sin;
#if ENABLE_PING6
		struct sockaddr_in6 sin6;
#endif
	} pingaddr;
	unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define if_index     (G.if_index    )
#define source_lsa   (G.source_lsa  )
#define str_I        (G.str_I       )
#define datalen      (G.datalen     )
#define pingcount    (G.pingcount   )
#define opt_ttl      (G.opt_ttl     )
#define myid         (G.myid        )
#define tmin         (G.tmin        )
#define tmax         (G.tmax        )
#define tsum         (G.tsum        )
#define deadline     (G.deadline    )
#define timeout      (G.timeout     )
#define total_secs   (G.total_secs  )
#define hostname     (G.hostname    )
#define dotted       (G.dotted      )
#define pingaddr     (G.pingaddr    )
#define rcvd_tbl     (G.rcvd_tbl    )
void BUG_ping_globals_too_big(void);
#define INIT_G() do { \
	if (sizeof(G) > COMMON_BUFSIZE) \
		BUG_ping_globals_too_big(); \
	datalen = DEFDATALEN; \
	timeout = MAXWAIT; \
	tmin = UINT_MAX; \
} while (0)


#define BYTE(bit)	rcvd_tbl[(bit)>>3]
#define MASK(bit)	(1 << ((bit) & 7))
#define SET(bit)	(BYTE(bit) |= MASK(bit))
#define CLR(bit)	(BYTE(bit) &= (~MASK(bit)))
#define TST(bit)	(BYTE(bit) & MASK(bit))

static void print_stats_and_exit(int junk) NORETURN;
static void print_stats_and_exit(int junk UNUSED_PARAM)
{
	unsigned long ul;
	unsigned long nrecv;

	signal(SIGINT, SIG_IGN);

	nrecv = G.nreceived;
	printf("\n--- %s ping statistics ---\n"
		"%lu packets transmitted, "
		"%lu packets received, ",
		hostname, G.ntransmitted, nrecv
	);
	if (G.nrepeats)
		printf("%lu duplicates, ", G.nrepeats);
	ul = G.ntransmitted;
	if (ul != 0)
		ul = (ul - nrecv) * 100 / ul;
	printf("%lu%% packet loss\n", ul);
	if (tmin != UINT_MAX) {
		unsigned tavg = tsum / (nrecv + G.nrepeats);
		printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
			tmin / 1000, tmin % 1000,
			tavg / 1000, tavg % 1000,
			tmax / 1000, tmax % 1000);
	}
	/* if condition is true, exit with 1 -- 'failure' */
	exit(nrecv == 0 || (deadline && nrecv < pingcount));
}

static void sendping_tail(void (*sp)(int), int size_pkt)
{
	int sz;

	CLR((uint16_t)G.ntransmitted % MAX_DUP_CHK);
	G.ntransmitted++;

	size_pkt += datalen;

	/* sizeof(pingaddr) can be larger than real sa size, but I think
	 * it doesn't matter */
	sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr));
	if (sz != size_pkt)
		bb_error_msg_and_die(bb_msg_write_error);

	if (pingcount == 0 || deadline || G.ntransmitted < pingcount) {
		/* Didn't send all pings yet - schedule next in 1s */
		signal(SIGALRM, sp);
		if (deadline) {
			total_secs += PINGINTERVAL;
			if (total_secs >= deadline)
				signal(SIGALRM, print_stats_and_exit);
		}
		alarm(PINGINTERVAL);
	} else { /* -c NN, and all NN are sent (and no deadline) */
		/* Wait for the last ping to come back.
		 * -W timeout: wait for a response in seconds.
		 * Affects only timeout in absense of any responses,
		 * otherwise ping waits for two RTTs. */
		unsigned expire = timeout;

		if (G.nreceived) {
			/* approx. 2*tmax, in seconds (2 RTT) */
			expire = tmax / (512*1024);
			if (expire == 0)
				expire = 1;
		}
		signal(SIGALRM, print_stats_and_exit);
		alarm(expire);
	}
}

static void sendping4(int junk UNUSED_PARAM)
{
	struct icmp *pkt = G.snd_packet;

	memset(pkt, G.pattern, datalen + ICMP_MINLEN + 4);
	pkt->icmp_type = ICMP_ECHO;
	/*pkt->icmp_code = 0;*/
	pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
	pkt->icmp_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
	pkt->icmp_id = myid;

	/* If datalen < 4, we store timestamp _past_ the packet,
	 * but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
	 */
	/*if (datalen >= 4)*/
		/* No hton: we'll read it back on the same machine */
		*(uint32_t*)&pkt->icmp_dun = monotonic_us();

	pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);

	sendping_tail(sendping4, ICMP_MINLEN);
}
#if ENABLE_PING6
static void sendping6(int junk UNUSED_PARAM)
{
	struct icmp6_hdr *pkt = G.snd_packet;

	memset(pkt, G.pattern, datalen + sizeof(struct icmp6_hdr) + 4);
	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
	/*pkt->icmp6_code = 0;*/
	/*pkt->icmp6_cksum = 0;*/
	pkt->icmp6_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
	pkt->icmp6_id = myid;

	/*if (datalen >= 4)*/
		*(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();

	//TODO? pkt->icmp_cksum = inet_cksum(...);

	sendping_tail(sendping6, sizeof(struct icmp6_hdr));
}
#endif

static const char *icmp_type_name(int id)
{
	switch (id) {
	case ICMP_ECHOREPLY:      return "Echo Reply";
	case ICMP_DEST_UNREACH:   return "Destination Unreachable";
	case ICMP_SOURCE_QUENCH:  return "Source Quench";
	case ICMP_REDIRECT:       return "Redirect (change route)";
	case ICMP_ECHO:           return "Echo Request";
	case ICMP_TIME_EXCEEDED:  return "Time Exceeded";
	case ICMP_PARAMETERPROB:  return "Parameter Problem";
	case ICMP_TIMESTAMP:      return "Timestamp Request";
	case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
	case ICMP_INFO_REQUEST:   return "Information Request";
	case ICMP_INFO_REPLY:     return "Information Reply";
	case ICMP_ADDRESS:        return "Address Mask Request";
	case ICMP_ADDRESSREPLY:   return "Address Mask Reply";
	default:                  return "unknown ICMP type";
	}
}
#if ENABLE_PING6
/* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
 * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
#ifndef MLD_LISTENER_QUERY
# define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
#endif
#ifndef MLD_LISTENER_REPORT
# define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
#endif
#ifndef MLD_LISTENER_REDUCTION
# define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
#endif
static const char *icmp6_type_name(int id)
{
	switch (id) {
	case ICMP6_DST_UNREACH:      return "Destination Unreachable";
	case ICMP6_PACKET_TOO_BIG:   return "Packet too big";
	case ICMP6_TIME_EXCEEDED:    return "Time Exceeded";
	case ICMP6_PARAM_PROB:       return "Parameter Problem";
	case ICMP6_ECHO_REPLY:       return "Echo Reply";
	case ICMP6_ECHO_REQUEST:     return "Echo Request";
	case MLD_LISTENER_QUERY:     return "Listener Query";
	case MLD_LISTENER_REPORT:    return "Listener Report";
	case MLD_LISTENER_REDUCTION: return "Listener Reduction";
	default:                     return "unknown ICMP type";
	}
}
#endif

static void unpack_tail(int sz, uint32_t *tp,
		const char *from_str,
		uint16_t recv_seq, int ttl)
{
	unsigned char *b, m;
	const char *dupmsg = " (DUP!)";
	unsigned triptime = triptime; /* for gcc */

	if (tp) {
		/* (int32_t) cast is for hypothetical 64-bit unsigned */
		/* (doesn't hurt 32-bit real-world anyway) */
		triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
		tsum += triptime;
		if (triptime < tmin)
			tmin = triptime;
		if (triptime > tmax)
			tmax = triptime;
	}

	b = &BYTE(recv_seq % MAX_DUP_CHK);
	m = MASK(recv_seq % MAX_DUP_CHK);
	/*if TST(recv_seq % MAX_DUP_CHK):*/
	if (*b & m) {
		++G.nrepeats;
	} else {
		/*SET(recv_seq % MAX_DUP_CHK):*/
		*b |= m;
		++G.nreceived;
		dupmsg += 7;
	}

	if (option_mask32 & OPT_QUIET)
		return;

	printf("%d bytes from %s: seq=%u ttl=%d", sz,
		from_str, recv_seq, ttl);
	if (tp)
		printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
	puts(dupmsg);
	fflush_all();
}
static void unpack4(char *buf, int sz, struct sockaddr_in *from)
{
	struct icmp *icmppkt;
	struct iphdr *iphdr;
	int hlen;

	/* discard if too short */
	if (sz < (datalen + ICMP_MINLEN))
		return;

	/* check IP header */
	iphdr = (struct iphdr *) buf;
	hlen = iphdr->ihl << 2;
	sz -= hlen;
	icmppkt = (struct icmp *) (buf + hlen);
	if (icmppkt->icmp_id != myid)
		return;				/* not our ping */

	if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
		uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
		uint32_t *tp = NULL;

		if (sz >= ICMP_MINLEN + sizeof(uint32_t))
			tp = (uint32_t *) icmppkt->icmp_data;
		unpack_tail(sz, tp,
			inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
			recv_seq, iphdr->ttl);
	} else if (icmppkt->icmp_type != ICMP_ECHO) {
		bb_error_msg("warning: got ICMP %d (%s)",
				icmppkt->icmp_type,
				icmp_type_name(icmppkt->icmp_type));
	}
}
#if ENABLE_PING6
static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
{
	struct icmp6_hdr *icmppkt;
	char buf[INET6_ADDRSTRLEN];

	/* discard if too short */
	if (sz < (datalen + sizeof(struct icmp6_hdr)))
		return;

	icmppkt = (struct icmp6_hdr *) packet;
	if (icmppkt->icmp6_id != myid)
		return;				/* not our ping */

	if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
		uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
		uint32_t *tp = NULL;

		if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
			tp = (uint32_t *) &icmppkt->icmp6_data8[4];
		unpack_tail(sz, tp,
			inet_ntop(AF_INET6, &from->sin6_addr,
					buf, sizeof(buf)),
			recv_seq, hoplimit);
	} else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
		bb_error_msg("warning: got ICMP %d (%s)",
				icmppkt->icmp6_type,
				icmp6_type_name(icmppkt->icmp6_type));
	}
}
#endif

static void ping4(len_and_sockaddr *lsa)
{
	int sockopt;

	pingaddr.sin = lsa->u.sin;
	if (source_lsa) {
		if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
				&source_lsa->u.sa, source_lsa->len))
			bb_error_msg_and_die("can't set multicast source interface");
		xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
	}

	/* enable broadcast pings */
	setsockopt_broadcast(pingsock);

	/* set recv buf (needed if we can get lots of responses: flood ping,
	 * broadcast ping etc) */
	sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
	setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt);

	if (opt_ttl != 0) {
		setsockopt_int(pingsock, IPPROTO_IP, IP_TTL, opt_ttl);
		/* above doesnt affect packets sent to bcast IP, so... */
		setsockopt_int(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, opt_ttl);
	}

	signal(SIGINT, print_stats_and_exit);

	/* start the ping's going ... */
	sendping4(0);

	/* listen for replies */
	while (1) {
		struct sockaddr_in from;
		socklen_t fromlen = (socklen_t) sizeof(from);
		int c;

		c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
				(struct sockaddr *) &from, &fromlen);
		if (c < 0) {
			if (errno != EINTR)
				bb_perror_msg("recvfrom");
			continue;
		}
		unpack4(G.rcv_packet, c, &from);
		if (pingcount && G.nreceived >= pingcount)
			break;
	}
}
#if ENABLE_PING6
extern int BUG_bad_offsetof_icmp6_cksum(void);
static void ping6(len_and_sockaddr *lsa)
{
	int sockopt;
	struct msghdr msg;
	struct sockaddr_in6 from;
	struct iovec iov;
	char control_buf[CMSG_SPACE(36)];

	pingaddr.sin6 = lsa->u.sin6;
	if (source_lsa)
		xbind(pingsock, &source_lsa->u.sa, source_lsa->len);

#ifdef ICMP6_FILTER
	{
		struct icmp6_filter filt;
		if (!(option_mask32 & OPT_VERBOSE)) {
			ICMP6_FILTER_SETBLOCKALL(&filt);
			ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
		} else {
			ICMP6_FILTER_SETPASSALL(&filt);
		}
		if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
					sizeof(filt)) < 0)
			bb_error_msg_and_die("setsockopt(%s)", "ICMP6_FILTER");
	}
#endif /*ICMP6_FILTER*/

	/* enable broadcast pings */
	setsockopt_broadcast(pingsock);

	/* set recv buf (needed if we can get lots of responses: flood ping,
	 * broadcast ping etc) */
	sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
	setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt);

	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
	if (sockopt != 2)
		BUG_bad_offsetof_icmp6_cksum();
	setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt);

	/* request ttl info to be returned in ancillary data */
	setsockopt_1(pingsock, SOL_IPV6, IPV6_HOPLIMIT);

	if (if_index)
		pingaddr.sin6.sin6_scope_id = if_index;

	signal(SIGINT, print_stats_and_exit);

	/* start the ping's going ... */
	sendping6(0);

	/* listen for replies */
	msg.msg_name = &from;
	msg.msg_namelen = sizeof(from);
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = control_buf;
	iov.iov_base = G.rcv_packet;
	iov.iov_len = G.sizeof_rcv_packet;
	while (1) {
		int c;
		struct cmsghdr *mp;
		int hoplimit = -1;
		msg.msg_controllen = sizeof(control_buf);

		c = recvmsg(pingsock, &msg, 0);
		if (c < 0) {
			if (errno != EINTR)
				bb_perror_msg("recvfrom");
			continue;
		}
		for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
			if (mp->cmsg_level == SOL_IPV6
			 && mp->cmsg_type == IPV6_HOPLIMIT
			 /* don't check len - we trust the kernel: */
			 /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
			) {
				/*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
				move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
			}
		}
		unpack6(G.rcv_packet, c, &from, hoplimit);
		if (pingcount && G.nreceived >= pingcount)
			break;
	}
}
#endif

static void ping(len_and_sockaddr *lsa)
{
	printf("PING %s (%s)", hostname, dotted);
	if (source_lsa) {
		printf(" from %s",
			xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
	}
	printf(": %d data bytes\n", datalen);

	create_icmp_socket(lsa);
	/* untested whether "-I addr" really works for IPv6: */
	if (str_I)
		setsockopt_bindtodevice(pingsock, str_I);

	G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
	G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
#if ENABLE_PING6
	if (lsa->u.sa.sa_family == AF_INET6) {
		/* +4 reserves a place for timestamp, which may end up sitting
		 * _after_ packet. Saves one if() - see sendping4/6() */
		G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
		ping6(lsa);
	} else
#endif
	{
		G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
		ping4(lsa);
	}
}

static int common_ping_main(int opt, char **argv)
{
	len_and_sockaddr *lsa;
	char *str_s, *str_p;

	INIT_G();

	/* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
	opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
	opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I, &str_p);
	if (opt & OPT_s)
		datalen = xatou16(str_s); // -s
	if (opt & OPT_I) { // -I
		if_index = if_nametoindex(str_I);
		if (!if_index) {
			/* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
			source_lsa = xdotted2sockaddr(str_I, 0);
			str_I = NULL; /* don't try to bind to device later */
		}
	}
	if (opt & OPT_p)
		G.pattern = xstrtou_range(str_p, 16, 0, 255);

	myid = (uint16_t) getpid();
	hostname = argv[optind];
#if ENABLE_PING6
	{
		sa_family_t af = AF_UNSPEC;
		if (opt & OPT_IPV4)
			af = AF_INET;
		if (opt & OPT_IPV6)
			af = AF_INET6;
		lsa = xhost_and_af2sockaddr(hostname, 0, af);
	}
#else
	lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
#endif

	if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
		/* leaking it here... */
		source_lsa = NULL;

	dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
	ping(lsa);
	print_stats_and_exit(EXIT_SUCCESS);
	/*return EXIT_SUCCESS;*/
}
#endif /* FEATURE_FANCY_PING */


int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ping_main(int argc UNUSED_PARAM, char **argv)
{
#if !ENABLE_FEATURE_FANCY_PING
	return common_ping_main(AF_UNSPEC, argv);
#else
	return common_ping_main(0, argv);
#endif
}

#if ENABLE_PING6
int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ping6_main(int argc UNUSED_PARAM, char **argv)
{
# if !ENABLE_FEATURE_FANCY_PING
	return common_ping_main(AF_INET6, argv);
# else
	return common_ping_main(OPT_IPV6, argv);
# endif
}
#endif

/* from ping6.c:
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Mike Muuss.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
 *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
 *
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */