source: MondoRescue/branches/3.3/mindi-busybox/networking/ping.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 27.1 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini ping implementation for busybox
4 *
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
6 *
7 * Adapted from the ping in netkit-base 0.10:
8 * Copyright (c) 1989 The Regents of the University of California.
9 * All rights reserved.
10 *
11 * This code is derived from software contributed to Berkeley by
12 * Mike Muuss.
13 *
14 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
15 */
16/* from ping6.c:
17 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
18 *
19 * This version of ping is adapted from the ping in netkit-base 0.10,
20 * which is:
21 *
22 * Original copyright notice is retained at the end of this file.
23 *
24 * This version is an adaptation of ping.c from busybox.
25 * The code was modified by Bart Visscher <magick@linux-fan.com>
26 */
27
28#include <net/if.h>
29#include <netinet/ip_icmp.h>
30#include "libbb.h"
31#include "common_bufsiz.h"
32
33#ifdef __BIONIC__
34/* should be in netinet/ip_icmp.h */
35# define ICMP_DEST_UNREACH 3 /* Destination Unreachable */
36# define ICMP_SOURCE_QUENCH 4 /* Source Quench */
37# define ICMP_REDIRECT 5 /* Redirect (change route) */
38# define ICMP_ECHO 8 /* Echo Request */
39# define ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
40# define ICMP_PARAMETERPROB 12 /* Parameter Problem */
41# define ICMP_TIMESTAMP 13 /* Timestamp Request */
42# define ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
43# define ICMP_INFO_REQUEST 15 /* Information Request */
44# define ICMP_INFO_REPLY 16 /* Information Reply */
45# define ICMP_ADDRESS 17 /* Address Mask Request */
46# define ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
47#endif
48
49//config:config PING
50//config: bool "ping"
51//config: default y
52//config: select PLATFORM_LINUX
53//config: help
54//config: ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to
55//config: elicit an ICMP ECHO_RESPONSE from a host or gateway.
56//config:
57//config:config PING6
58//config: bool "ping6"
59//config: default y
60//config: depends on FEATURE_IPV6 && PING
61//config: help
62//config: This will give you a ping that can talk IPv6.
63//config:
64//config:config FEATURE_FANCY_PING
65//config: bool "Enable fancy ping output"
66//config: default y
67//config: depends on PING
68//config: help
69//config: Make the output from the ping applet include statistics, and at the
70//config: same time provide full support for ICMP packets.
71
72/* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */
73//applet:IF_PING(APPLET(ping, BB_DIR_BIN, BB_SUID_MAYBE))
74//applet:IF_PING6(APPLET(ping6, BB_DIR_BIN, BB_SUID_MAYBE))
75
76//kbuild:lib-$(CONFIG_PING) += ping.o
77//kbuild:lib-$(CONFIG_PING6) += ping.o
78
79//usage:#if !ENABLE_FEATURE_FANCY_PING
80//usage:# define ping_trivial_usage
81//usage: "HOST"
82//usage:# define ping_full_usage "\n\n"
83//usage: "Send ICMP ECHO_REQUEST packets to network hosts"
84//usage:# define ping6_trivial_usage
85//usage: "HOST"
86//usage:# define ping6_full_usage "\n\n"
87//usage: "Send ICMP ECHO_REQUEST packets to network hosts"
88//usage:#else
89//usage:# define ping_trivial_usage
90//usage: "[OPTIONS] HOST"
91//usage:# define ping_full_usage "\n\n"
92//usage: "Send ICMP ECHO_REQUEST packets to network hosts\n"
93//usage: IF_PING6(
94//usage: "\n -4,-6 Force IP or IPv6 name resolution"
95//usage: )
96//usage: "\n -c CNT Send only CNT pings"
97//usage: "\n -s SIZE Send SIZE data bytes in packets (default:56)"
98//usage: "\n -t TTL Set TTL"
99//usage: "\n -I IFACE/IP Use interface or IP address as source"
100//usage: "\n -W SEC Seconds to wait for the first response (default:10)"
101//usage: "\n (after all -c CNT packets are sent)"
102//usage: "\n -w SEC Seconds until ping exits (default:infinite)"
103//usage: "\n (can exit earlier with -c CNT)"
104//usage: "\n -q Quiet, only display output at start"
105//usage: "\n and when finished"
106//usage: "\n -p Pattern to use for payload"
107//usage:
108//usage:# define ping6_trivial_usage
109//usage: "[OPTIONS] HOST"
110//usage:# define ping6_full_usage "\n\n"
111//usage: "Send ICMP ECHO_REQUEST packets to network hosts\n"
112//usage: "\n -c CNT Send only CNT pings"
113//usage: "\n -s SIZE Send SIZE data bytes in packets (default:56)"
114//usage: "\n -I IFACE/IP Use interface or IP address as source"
115//usage: "\n -q Quiet, only display output at start"
116//usage: "\n and when finished"
117//usage: "\n -p Pattern to use for payload"
118//usage:
119//usage:#endif
120//usage:
121//usage:#define ping_example_usage
122//usage: "$ ping localhost\n"
123//usage: "PING slag (127.0.0.1): 56 data bytes\n"
124//usage: "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
125//usage: "\n"
126//usage: "--- debian ping statistics ---\n"
127//usage: "1 packets transmitted, 1 packets received, 0% packet loss\n"
128//usage: "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
129//usage:#define ping6_example_usage
130//usage: "$ ping6 ip6-localhost\n"
131//usage: "PING ip6-localhost (::1): 56 data bytes\n"
132//usage: "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
133//usage: "\n"
134//usage: "--- ip6-localhost ping statistics ---\n"
135//usage: "1 packets transmitted, 1 packets received, 0% packet loss\n"
136//usage: "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
137
138#if ENABLE_PING6
139# include <netinet/icmp6.h>
140/* I see RENUMBERED constants in bits/in.h - !!?
141 * What a fuck is going on with libc? Is it a glibc joke? */
142# ifdef IPV6_2292HOPLIMIT
143# undef IPV6_HOPLIMIT
144# define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
145# endif
146#endif
147
148enum {
149 DEFDATALEN = 56,
150 MAXIPLEN = 60,
151 MAXICMPLEN = 76,
152 MAX_DUP_CHK = (8 * 128),
153 MAXWAIT = 10,
154 PINGINTERVAL = 1, /* 1 second */
155 pingsock = 0,
156};
157
158static void
159#if ENABLE_PING6
160create_icmp_socket(len_and_sockaddr *lsa)
161#else
162create_icmp_socket(void)
163#define create_icmp_socket(lsa) create_icmp_socket()
164#endif
165{
166 int sock;
167#if ENABLE_PING6
168 if (lsa->u.sa.sa_family == AF_INET6)
169 sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
170 else
171#endif
172 sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
173 if (sock < 0) {
174 if (errno == EPERM)
175 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
176 bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
177 }
178
179 xmove_fd(sock, pingsock);
180}
181
182#if !ENABLE_FEATURE_FANCY_PING
183
184/* Simple version */
185
186struct globals {
187 char *hostname;
188 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
189} FIX_ALIASING;
190#define G (*(struct globals*)bb_common_bufsiz1)
191#define INIT_G() do { setup_common_bufsiz(); } while (0)
192
193static void noresp(int ign UNUSED_PARAM)
194{
195 printf("No response from %s\n", G.hostname);
196 exit(EXIT_FAILURE);
197}
198
199static void ping4(len_and_sockaddr *lsa)
200{
201 struct icmp *pkt;
202 int c;
203
204 pkt = (struct icmp *) G.packet;
205 /*memset(pkt, 0, sizeof(G.packet)); already is */
206 pkt->icmp_type = ICMP_ECHO;
207 pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, sizeof(G.packet));
208
209 xsendto(pingsock, G.packet, DEFDATALEN + ICMP_MINLEN, &lsa->u.sa, lsa->len);
210
211 /* listen for replies */
212 while (1) {
213#if 0
214 struct sockaddr_in from;
215 socklen_t fromlen = sizeof(from);
216
217 c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
218 (struct sockaddr *) &from, &fromlen);
219#else
220 c = recv(pingsock, G.packet, sizeof(G.packet), 0);
221#endif
222 if (c < 0) {
223 if (errno != EINTR)
224 bb_perror_msg("recvfrom");
225 continue;
226 }
227 if (c >= 76) { /* ip + icmp */
228 struct iphdr *iphdr = (struct iphdr *) G.packet;
229
230 pkt = (struct icmp *) (G.packet + (iphdr->ihl << 2)); /* skip ip hdr */
231 if (pkt->icmp_type == ICMP_ECHOREPLY)
232 break;
233 }
234 }
235 if (ENABLE_FEATURE_CLEAN_UP)
236 close(pingsock);
237}
238
239#if ENABLE_PING6
240static void ping6(len_and_sockaddr *lsa)
241{
242 struct icmp6_hdr *pkt;
243 int c;
244 int sockopt;
245
246 pkt = (struct icmp6_hdr *) G.packet;
247 /*memset(pkt, 0, sizeof(G.packet)); already is */
248 pkt->icmp6_type = ICMP6_ECHO_REQUEST;
249
250 sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
251 setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt);
252
253 xsendto(pingsock, G.packet, DEFDATALEN + sizeof(struct icmp6_hdr), &lsa->u.sa, lsa->len);
254
255 /* listen for replies */
256 while (1) {
257#if 0
258 struct sockaddr_in6 from;
259 socklen_t fromlen = sizeof(from);
260
261 c = recvfrom(pingsock, G.packet, sizeof(G.packet), 0,
262 (struct sockaddr *) &from, &fromlen);
263#else
264 c = recv(pingsock, G.packet, sizeof(G.packet), 0);
265#endif
266 if (c < 0) {
267 if (errno != EINTR)
268 bb_perror_msg("recvfrom");
269 continue;
270 }
271 if (c >= ICMP_MINLEN) { /* icmp6_hdr */
272 if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
273 break;
274 }
275 }
276 if (ENABLE_FEATURE_CLEAN_UP)
277 close(pingsock);
278}
279#endif
280
281#if !ENABLE_PING6
282# define common_ping_main(af, argv) common_ping_main(argv)
283#endif
284static int common_ping_main(sa_family_t af, char **argv)
285{
286 len_and_sockaddr *lsa;
287
288 INIT_G();
289
290#if ENABLE_PING6
291 while ((++argv)[0] && argv[0][0] == '-') {
292 if (argv[0][1] == '4') {
293 af = AF_INET;
294 continue;
295 }
296 if (argv[0][1] == '6') {
297 af = AF_INET6;
298 continue;
299 }
300 bb_show_usage();
301 }
302#else
303 argv++;
304#endif
305
306 G.hostname = *argv;
307 if (!G.hostname)
308 bb_show_usage();
309
310#if ENABLE_PING6
311 lsa = xhost_and_af2sockaddr(G.hostname, 0, af);
312#else
313 lsa = xhost_and_af2sockaddr(G.hostname, 0, AF_INET);
314#endif
315 /* Set timer _after_ DNS resolution */
316 signal(SIGALRM, noresp);
317 alarm(5); /* give the host 5000ms to respond */
318
319 create_icmp_socket(lsa);
320#if ENABLE_PING6
321 if (lsa->u.sa.sa_family == AF_INET6)
322 ping6(lsa);
323 else
324#endif
325 ping4(lsa);
326 printf("%s is alive!\n", G.hostname);
327 return EXIT_SUCCESS;
328}
329
330
331#else /* FEATURE_FANCY_PING */
332
333
334/* Full(er) version */
335
336#define OPT_STRING ("qvc:s:t:w:W:I:np:4" IF_PING6("6"))
337enum {
338 OPT_QUIET = 1 << 0,
339 OPT_VERBOSE = 1 << 1,
340 OPT_c = 1 << 2,
341 OPT_s = 1 << 3,
342 OPT_t = 1 << 4,
343 OPT_w = 1 << 5,
344 OPT_W = 1 << 6,
345 OPT_I = 1 << 7,
346 /*OPT_n = 1 << 8, - ignored */
347 OPT_p = 1 << 9,
348 OPT_IPV4 = 1 << 10,
349 OPT_IPV6 = (1 << 11) * ENABLE_PING6,
350};
351
352
353struct globals {
354 int if_index;
355 char *str_I;
356 len_and_sockaddr *source_lsa;
357 unsigned datalen;
358 unsigned pingcount; /* must be int-sized */
359 unsigned opt_ttl;
360 unsigned long ntransmitted, nreceived, nrepeats;
361 uint16_t myid;
362 uint8_t pattern;
363 unsigned tmin, tmax; /* in us */
364 unsigned long long tsum; /* in us, sum of all times */
365 unsigned deadline;
366 unsigned timeout;
367 unsigned total_secs;
368 unsigned sizeof_rcv_packet;
369 char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
370 void *snd_packet; /* [datalen + ipv4/ipv6_const] */
371 const char *hostname;
372 const char *dotted;
373 union {
374 struct sockaddr sa;
375 struct sockaddr_in sin;
376#if ENABLE_PING6
377 struct sockaddr_in6 sin6;
378#endif
379 } pingaddr;
380 unsigned char rcvd_tbl[MAX_DUP_CHK / 8];
381} FIX_ALIASING;
382#define G (*(struct globals*)bb_common_bufsiz1)
383#define if_index (G.if_index )
384#define source_lsa (G.source_lsa )
385#define str_I (G.str_I )
386#define datalen (G.datalen )
387#define pingcount (G.pingcount )
388#define opt_ttl (G.opt_ttl )
389#define myid (G.myid )
390#define tmin (G.tmin )
391#define tmax (G.tmax )
392#define tsum (G.tsum )
393#define deadline (G.deadline )
394#define timeout (G.timeout )
395#define total_secs (G.total_secs )
396#define hostname (G.hostname )
397#define dotted (G.dotted )
398#define pingaddr (G.pingaddr )
399#define rcvd_tbl (G.rcvd_tbl )
400#define INIT_G() do { \
401 setup_common_bufsiz(); \
402 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
403 datalen = DEFDATALEN; \
404 timeout = MAXWAIT; \
405 tmin = UINT_MAX; \
406} while (0)
407
408
409#define BYTE(bit) rcvd_tbl[(bit)>>3]
410#define MASK(bit) (1 << ((bit) & 7))
411#define SET(bit) (BYTE(bit) |= MASK(bit))
412#define CLR(bit) (BYTE(bit) &= (~MASK(bit)))
413#define TST(bit) (BYTE(bit) & MASK(bit))
414
415static void print_stats_and_exit(int junk) NORETURN;
416static void print_stats_and_exit(int junk UNUSED_PARAM)
417{
418 unsigned long ul;
419 unsigned long nrecv;
420
421 signal(SIGINT, SIG_IGN);
422
423 nrecv = G.nreceived;
424 printf("\n--- %s ping statistics ---\n"
425 "%lu packets transmitted, "
426 "%lu packets received, ",
427 hostname, G.ntransmitted, nrecv
428 );
429 if (G.nrepeats)
430 printf("%lu duplicates, ", G.nrepeats);
431 ul = G.ntransmitted;
432 if (ul != 0)
433 ul = (ul - nrecv) * 100 / ul;
434 printf("%lu%% packet loss\n", ul);
435 if (tmin != UINT_MAX) {
436 unsigned tavg = tsum / (nrecv + G.nrepeats);
437 printf("round-trip min/avg/max = %u.%03u/%u.%03u/%u.%03u ms\n",
438 tmin / 1000, tmin % 1000,
439 tavg / 1000, tavg % 1000,
440 tmax / 1000, tmax % 1000);
441 }
442 /* if condition is true, exit with 1 -- 'failure' */
443 exit(nrecv == 0 || (deadline && nrecv < pingcount));
444}
445
446static void sendping_tail(void (*sp)(int), int size_pkt)
447{
448 int sz;
449
450 CLR((uint16_t)G.ntransmitted % MAX_DUP_CHK);
451 G.ntransmitted++;
452
453 size_pkt += datalen;
454
455 /* sizeof(pingaddr) can be larger than real sa size, but I think
456 * it doesn't matter */
457 sz = xsendto(pingsock, G.snd_packet, size_pkt, &pingaddr.sa, sizeof(pingaddr));
458 if (sz != size_pkt)
459 bb_error_msg_and_die(bb_msg_write_error);
460
461 if (pingcount == 0 || deadline || G.ntransmitted < pingcount) {
462 /* Didn't send all pings yet - schedule next in 1s */
463 signal(SIGALRM, sp);
464 if (deadline) {
465 total_secs += PINGINTERVAL;
466 if (total_secs >= deadline)
467 signal(SIGALRM, print_stats_and_exit);
468 }
469 alarm(PINGINTERVAL);
470 } else { /* -c NN, and all NN are sent (and no deadline) */
471 /* Wait for the last ping to come back.
472 * -W timeout: wait for a response in seconds.
473 * Affects only timeout in absense of any responses,
474 * otherwise ping waits for two RTTs. */
475 unsigned expire = timeout;
476
477 if (G.nreceived) {
478 /* approx. 2*tmax, in seconds (2 RTT) */
479 expire = tmax / (512*1024);
480 if (expire == 0)
481 expire = 1;
482 }
483 signal(SIGALRM, print_stats_and_exit);
484 alarm(expire);
485 }
486}
487
488static void sendping4(int junk UNUSED_PARAM)
489{
490 struct icmp *pkt = G.snd_packet;
491
492 memset(pkt, G.pattern, datalen + ICMP_MINLEN + 4);
493 pkt->icmp_type = ICMP_ECHO;
494 /*pkt->icmp_code = 0;*/
495 pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
496 pkt->icmp_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
497 pkt->icmp_id = myid;
498
499 /* If datalen < 4, we store timestamp _past_ the packet,
500 * but it's ok - we allocated 4 extra bytes in xzalloc() just in case.
501 */
502 /*if (datalen >= 4)*/
503 /* No hton: we'll read it back on the same machine */
504 *(uint32_t*)&pkt->icmp_dun = monotonic_us();
505
506 pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);
507
508 sendping_tail(sendping4, ICMP_MINLEN);
509}
510#if ENABLE_PING6
511static void sendping6(int junk UNUSED_PARAM)
512{
513 struct icmp6_hdr *pkt = G.snd_packet;
514
515 memset(pkt, G.pattern, datalen + sizeof(struct icmp6_hdr) + 4);
516 pkt->icmp6_type = ICMP6_ECHO_REQUEST;
517 /*pkt->icmp6_code = 0;*/
518 /*pkt->icmp6_cksum = 0;*/
519 pkt->icmp6_seq = htons(G.ntransmitted); /* don't ++ here, it can be a macro */
520 pkt->icmp6_id = myid;
521
522 /*if (datalen >= 4)*/
523 *(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
524
525 //TODO? pkt->icmp_cksum = inet_cksum(...);
526
527 sendping_tail(sendping6, sizeof(struct icmp6_hdr));
528}
529#endif
530
531static const char *icmp_type_name(int id)
532{
533 switch (id) {
534 case ICMP_ECHOREPLY: return "Echo Reply";
535 case ICMP_DEST_UNREACH: return "Destination Unreachable";
536 case ICMP_SOURCE_QUENCH: return "Source Quench";
537 case ICMP_REDIRECT: return "Redirect (change route)";
538 case ICMP_ECHO: return "Echo Request";
539 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
540 case ICMP_PARAMETERPROB: return "Parameter Problem";
541 case ICMP_TIMESTAMP: return "Timestamp Request";
542 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
543 case ICMP_INFO_REQUEST: return "Information Request";
544 case ICMP_INFO_REPLY: return "Information Reply";
545 case ICMP_ADDRESS: return "Address Mask Request";
546 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
547 default: return "unknown ICMP type";
548 }
549}
550#if ENABLE_PING6
551/* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
552 * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
553#ifndef MLD_LISTENER_QUERY
554# define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
555#endif
556#ifndef MLD_LISTENER_REPORT
557# define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
558#endif
559#ifndef MLD_LISTENER_REDUCTION
560# define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
561#endif
562static const char *icmp6_type_name(int id)
563{
564 switch (id) {
565 case ICMP6_DST_UNREACH: return "Destination Unreachable";
566 case ICMP6_PACKET_TOO_BIG: return "Packet too big";
567 case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
568 case ICMP6_PARAM_PROB: return "Parameter Problem";
569 case ICMP6_ECHO_REPLY: return "Echo Reply";
570 case ICMP6_ECHO_REQUEST: return "Echo Request";
571 case MLD_LISTENER_QUERY: return "Listener Query";
572 case MLD_LISTENER_REPORT: return "Listener Report";
573 case MLD_LISTENER_REDUCTION: return "Listener Reduction";
574 default: return "unknown ICMP type";
575 }
576}
577#endif
578
579static void unpack_tail(int sz, uint32_t *tp,
580 const char *from_str,
581 uint16_t recv_seq, int ttl)
582{
583 unsigned char *b, m;
584 const char *dupmsg = " (DUP!)";
585 unsigned triptime = triptime; /* for gcc */
586
587 if (tp) {
588 /* (int32_t) cast is for hypothetical 64-bit unsigned */
589 /* (doesn't hurt 32-bit real-world anyway) */
590 triptime = (int32_t) ((uint32_t)monotonic_us() - *tp);
591 tsum += triptime;
592 if (triptime < tmin)
593 tmin = triptime;
594 if (triptime > tmax)
595 tmax = triptime;
596 }
597
598 b = &BYTE(recv_seq % MAX_DUP_CHK);
599 m = MASK(recv_seq % MAX_DUP_CHK);
600 /*if TST(recv_seq % MAX_DUP_CHK):*/
601 if (*b & m) {
602 ++G.nrepeats;
603 } else {
604 /*SET(recv_seq % MAX_DUP_CHK):*/
605 *b |= m;
606 ++G.nreceived;
607 dupmsg += 7;
608 }
609
610 if (option_mask32 & OPT_QUIET)
611 return;
612
613 printf("%d bytes from %s: seq=%u ttl=%d", sz,
614 from_str, recv_seq, ttl);
615 if (tp)
616 printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
617 puts(dupmsg);
618 fflush_all();
619}
620static void unpack4(char *buf, int sz, struct sockaddr_in *from)
621{
622 struct icmp *icmppkt;
623 struct iphdr *iphdr;
624 int hlen;
625
626 /* discard if too short */
627 if (sz < (datalen + ICMP_MINLEN))
628 return;
629
630 /* check IP header */
631 iphdr = (struct iphdr *) buf;
632 hlen = iphdr->ihl << 2;
633 sz -= hlen;
634 icmppkt = (struct icmp *) (buf + hlen);
635 if (icmppkt->icmp_id != myid)
636 return; /* not our ping */
637
638 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
639 uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
640 uint32_t *tp = NULL;
641
642 if (sz >= ICMP_MINLEN + sizeof(uint32_t))
643 tp = (uint32_t *) icmppkt->icmp_data;
644 unpack_tail(sz, tp,
645 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
646 recv_seq, iphdr->ttl);
647 } else if (icmppkt->icmp_type != ICMP_ECHO) {
648 bb_error_msg("warning: got ICMP %d (%s)",
649 icmppkt->icmp_type,
650 icmp_type_name(icmppkt->icmp_type));
651 }
652}
653#if ENABLE_PING6
654static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
655{
656 struct icmp6_hdr *icmppkt;
657 char buf[INET6_ADDRSTRLEN];
658
659 /* discard if too short */
660 if (sz < (datalen + sizeof(struct icmp6_hdr)))
661 return;
662
663 icmppkt = (struct icmp6_hdr *) packet;
664 if (icmppkt->icmp6_id != myid)
665 return; /* not our ping */
666
667 if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
668 uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
669 uint32_t *tp = NULL;
670
671 if (sz >= sizeof(struct icmp6_hdr) + sizeof(uint32_t))
672 tp = (uint32_t *) &icmppkt->icmp6_data8[4];
673 unpack_tail(sz, tp,
674 inet_ntop(AF_INET6, &from->sin6_addr,
675 buf, sizeof(buf)),
676 recv_seq, hoplimit);
677 } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
678 bb_error_msg("warning: got ICMP %d (%s)",
679 icmppkt->icmp6_type,
680 icmp6_type_name(icmppkt->icmp6_type));
681 }
682}
683#endif
684
685static void ping4(len_and_sockaddr *lsa)
686{
687 int sockopt;
688
689 pingaddr.sin = lsa->u.sin;
690 if (source_lsa) {
691 if (setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_IF,
692 &source_lsa->u.sa, source_lsa->len))
693 bb_error_msg_and_die("can't set multicast source interface");
694 xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
695 }
696
697 /* enable broadcast pings */
698 setsockopt_broadcast(pingsock);
699
700 /* set recv buf (needed if we can get lots of responses: flood ping,
701 * broadcast ping etc) */
702 sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
703 setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt);
704
705 if (opt_ttl != 0) {
706 setsockopt_int(pingsock, IPPROTO_IP, IP_TTL, opt_ttl);
707 /* above doesnt affect packets sent to bcast IP, so... */
708 setsockopt_int(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, opt_ttl);
709 }
710
711 signal(SIGINT, print_stats_and_exit);
712
713 /* start the ping's going ... */
714 sendping4(0);
715
716 /* listen for replies */
717 while (1) {
718 struct sockaddr_in from;
719 socklen_t fromlen = (socklen_t) sizeof(from);
720 int c;
721
722 c = recvfrom(pingsock, G.rcv_packet, G.sizeof_rcv_packet, 0,
723 (struct sockaddr *) &from, &fromlen);
724 if (c < 0) {
725 if (errno != EINTR)
726 bb_perror_msg("recvfrom");
727 continue;
728 }
729 unpack4(G.rcv_packet, c, &from);
730 if (pingcount && G.nreceived >= pingcount)
731 break;
732 }
733}
734#if ENABLE_PING6
735static void ping6(len_and_sockaddr *lsa)
736{
737 int sockopt;
738 struct msghdr msg;
739 struct sockaddr_in6 from;
740 struct iovec iov;
741 char control_buf[CMSG_SPACE(36)];
742
743 pingaddr.sin6 = lsa->u.sin6;
744 if (source_lsa)
745 xbind(pingsock, &source_lsa->u.sa, source_lsa->len);
746
747#ifdef ICMP6_FILTER
748 {
749 struct icmp6_filter filt;
750 if (!(option_mask32 & OPT_VERBOSE)) {
751 ICMP6_FILTER_SETBLOCKALL(&filt);
752 ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
753 } else {
754 ICMP6_FILTER_SETPASSALL(&filt);
755 }
756 if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
757 sizeof(filt)) < 0)
758 bb_error_msg_and_die("setsockopt(%s)", "ICMP6_FILTER");
759 }
760#endif /*ICMP6_FILTER*/
761
762 /* enable broadcast pings */
763 setsockopt_broadcast(pingsock);
764
765 /* set recv buf (needed if we can get lots of responses: flood ping,
766 * broadcast ping etc) */
767 sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
768 setsockopt_SOL_SOCKET_int(pingsock, SO_RCVBUF, sockopt);
769
770 sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
771 BUILD_BUG_ON(offsetof(struct icmp6_hdr, icmp6_cksum) != 2);
772 setsockopt_int(pingsock, SOL_RAW, IPV6_CHECKSUM, sockopt);
773
774 /* request ttl info to be returned in ancillary data */
775 setsockopt_1(pingsock, SOL_IPV6, IPV6_HOPLIMIT);
776
777 if (if_index)
778 pingaddr.sin6.sin6_scope_id = if_index;
779
780 signal(SIGINT, print_stats_and_exit);
781
782 /* start the ping's going ... */
783 sendping6(0);
784
785 /* listen for replies */
786 msg.msg_name = &from;
787 msg.msg_namelen = sizeof(from);
788 msg.msg_iov = &iov;
789 msg.msg_iovlen = 1;
790 msg.msg_control = control_buf;
791 iov.iov_base = G.rcv_packet;
792 iov.iov_len = G.sizeof_rcv_packet;
793 while (1) {
794 int c;
795 struct cmsghdr *mp;
796 int hoplimit = -1;
797 msg.msg_controllen = sizeof(control_buf);
798
799 c = recvmsg(pingsock, &msg, 0);
800 if (c < 0) {
801 if (errno != EINTR)
802 bb_perror_msg("recvfrom");
803 continue;
804 }
805 for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
806 if (mp->cmsg_level == SOL_IPV6
807 && mp->cmsg_type == IPV6_HOPLIMIT
808 /* don't check len - we trust the kernel: */
809 /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
810 ) {
811 /*hoplimit = *(int*)CMSG_DATA(mp); - unaligned access */
812 move_from_unaligned_int(hoplimit, CMSG_DATA(mp));
813 }
814 }
815 unpack6(G.rcv_packet, c, &from, hoplimit);
816 if (pingcount && G.nreceived >= pingcount)
817 break;
818 }
819}
820#endif
821
822static void ping(len_and_sockaddr *lsa)
823{
824 printf("PING %s (%s)", hostname, dotted);
825 if (source_lsa) {
826 printf(" from %s",
827 xmalloc_sockaddr2dotted_noport(&source_lsa->u.sa));
828 }
829 printf(": %d data bytes\n", datalen);
830
831 create_icmp_socket(lsa);
832 /* untested whether "-I addr" really works for IPv6: */
833 if (str_I)
834 setsockopt_bindtodevice(pingsock, str_I);
835
836 G.sizeof_rcv_packet = datalen + MAXIPLEN + MAXICMPLEN;
837 G.rcv_packet = xzalloc(G.sizeof_rcv_packet);
838#if ENABLE_PING6
839 if (lsa->u.sa.sa_family == AF_INET6) {
840 /* +4 reserves a place for timestamp, which may end up sitting
841 * _after_ packet. Saves one if() - see sendping4/6() */
842 G.snd_packet = xzalloc(datalen + sizeof(struct icmp6_hdr) + 4);
843 ping6(lsa);
844 } else
845#endif
846 {
847 G.snd_packet = xzalloc(datalen + ICMP_MINLEN + 4);
848 ping4(lsa);
849 }
850}
851
852static int common_ping_main(int opt, char **argv)
853{
854 len_and_sockaddr *lsa;
855 char *str_s, *str_p;
856
857 INIT_G();
858
859 /* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
860 opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
861 opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I, &str_p);
862 if (opt & OPT_s)
863 datalen = xatou16(str_s); // -s
864 if (opt & OPT_I) { // -I
865 if_index = if_nametoindex(str_I);
866 if (!if_index) {
867 /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
868 source_lsa = xdotted2sockaddr(str_I, 0);
869 str_I = NULL; /* don't try to bind to device later */
870 }
871 }
872 if (opt & OPT_p)
873 G.pattern = xstrtou_range(str_p, 16, 0, 255);
874
875 myid = (uint16_t) getpid();
876 hostname = argv[optind];
877#if ENABLE_PING6
878 {
879 sa_family_t af = AF_UNSPEC;
880 if (opt & OPT_IPV4)
881 af = AF_INET;
882 if (opt & OPT_IPV6)
883 af = AF_INET6;
884 lsa = xhost_and_af2sockaddr(hostname, 0, af);
885 }
886#else
887 lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
888#endif
889
890 if (source_lsa && source_lsa->u.sa.sa_family != lsa->u.sa.sa_family)
891 /* leaking it here... */
892 source_lsa = NULL;
893
894 dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
895 ping(lsa);
896 print_stats_and_exit(EXIT_SUCCESS);
897 /*return EXIT_SUCCESS;*/
898}
899#endif /* FEATURE_FANCY_PING */
900
901
902int ping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
903int ping_main(int argc UNUSED_PARAM, char **argv)
904{
905#if !ENABLE_FEATURE_FANCY_PING
906 return common_ping_main(AF_UNSPEC, argv);
907#else
908 return common_ping_main(0, argv);
909#endif
910}
911
912#if ENABLE_PING6
913int ping6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
914int ping6_main(int argc UNUSED_PARAM, char **argv)
915{
916# if !ENABLE_FEATURE_FANCY_PING
917 return common_ping_main(AF_INET6, argv);
918# else
919 return common_ping_main(OPT_IPV6, argv);
920# endif
921}
922#endif
923
924/* from ping6.c:
925 * Copyright (c) 1989 The Regents of the University of California.
926 * All rights reserved.
927 *
928 * This code is derived from software contributed to Berkeley by
929 * Mike Muuss.
930 *
931 * Redistribution and use in source and binary forms, with or without
932 * modification, are permitted provided that the following conditions
933 * are met:
934 * 1. Redistributions of source code must retain the above copyright
935 * notice, this list of conditions and the following disclaimer.
936 * 2. Redistributions in binary form must reproduce the above copyright
937 * notice, this list of conditions and the following disclaimer in the
938 * documentation and/or other materials provided with the distribution.
939 *
940 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
941 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
942 *
943 * 4. Neither the name of the University nor the names of its contributors
944 * may be used to endorse or promote products derived from this software
945 * without specific prior written permission.
946 *
947 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
948 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
949 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
950 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
951 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
952 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
953 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
954 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
955 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
956 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
957 * SUCH DAMAGE.
958 */
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