1 /* vi: set sw=4 ts=4: */
3 * Mini ping implementation for busybox
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
7 * Adapted from the ping in netkit-base 0.10:
8 * Copyright (c) 1989 The Regents of the University of California.
11 * This code is derived from software contributed to Berkeley by
14 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
17 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
19 * This version of ping is adapted from the ping in netkit-base 0.10,
22 * Original copyright notice is retained at the end of this file.
24 * This version is an adaptation of ping.c from busybox.
25 * The code was modified by Bart Visscher <magick@linux-fan.com>
29 #include <netinet/ip_icmp.h>
33 #include <netinet/icmp6.h>
34 /* I see RENUMBERED constants in bits/in.h - !!?
35 * What a fuck is going on with libc? Is it a glibc joke? */
36 #ifdef IPV6_2292HOPLIMIT
38 #define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
47 MAX_DUP_CHK = (8 * 128),
49 PINGINTERVAL = 1, /* 1 second */
54 static int in_cksum(unsigned short *buf, int sz)
58 unsigned short *w = buf;
59 unsigned short ans = 0;
67 *(unsigned char *) (&ans) = *(unsigned char *) w;
71 sum = (sum >> 16) + (sum & 0xFFFF);
77 #if !ENABLE_FEATURE_FANCY_PING
81 static char *hostname;
83 static void noresp(int ign ATTRIBUTE_UNUSED)
85 printf("No response from %s\n", hostname);
89 static void ping4(len_and_sockaddr *lsa)
91 struct sockaddr_in pingaddr;
94 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
96 pingsock = create_icmp_socket();
99 pkt = (struct icmp *) packet;
100 memset(pkt, 0, sizeof(packet));
101 pkt->icmp_type = ICMP_ECHO;
102 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
104 c = sendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, 0,
105 (struct sockaddr *) &pingaddr, sizeof(pingaddr));
108 if (ENABLE_FEATURE_CLEAN_UP)
110 bb_perror_msg_and_die("sendto");
113 /* listen for replies */
115 struct sockaddr_in from;
116 socklen_t fromlen = sizeof(from);
118 c = recvfrom(pingsock, packet, sizeof(packet), 0,
119 (struct sockaddr *) &from, &fromlen);
122 bb_perror_msg("recvfrom");
125 if (c >= 76) { /* ip + icmp */
126 struct iphdr *iphdr = (struct iphdr *) packet;
128 pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
129 if (pkt->icmp_type == ICMP_ECHOREPLY)
133 if (ENABLE_FEATURE_CLEAN_UP)
138 static void ping6(len_and_sockaddr *lsa)
140 struct sockaddr_in6 pingaddr;
141 struct icmp6_hdr *pkt;
144 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
146 pingsock = create_icmp6_socket();
147 pingaddr = lsa->sin6;
149 pkt = (struct icmp6_hdr *) packet;
150 memset(pkt, 0, sizeof(packet));
151 pkt->icmp6_type = ICMP6_ECHO_REQUEST;
153 sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
154 setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
156 c = sendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr), 0,
157 (struct sockaddr *) &pingaddr, sizeof(pingaddr));
160 if (ENABLE_FEATURE_CLEAN_UP)
162 bb_perror_msg_and_die("sendto");
165 /* listen for replies */
167 struct sockaddr_in6 from;
168 socklen_t fromlen = sizeof(from);
170 c = recvfrom(pingsock, packet, sizeof(packet), 0,
171 (struct sockaddr *) &from, &fromlen);
174 bb_perror_msg("recvfrom");
177 if (c >= 8) { /* icmp6_hdr */
178 pkt = (struct icmp6_hdr *) packet;
179 if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
183 if (ENABLE_FEATURE_CLEAN_UP)
188 int ping_main(int argc, char **argv);
189 int ping_main(int argc, char **argv)
191 len_and_sockaddr *lsa;
193 sa_family_t af = AF_UNSPEC;
194 while (++argv[0][0] == '-') {
195 if (argv[0][1] == '4') {
199 if (argv[0][1] == '6') {
214 lsa = xhost_and_af2sockaddr(hostname, 0, af);
216 lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
218 /* Set timer _after_ DNS resolution */
219 signal(SIGALRM, noresp);
220 alarm(5); /* give the host 5000ms to respond */
223 if (lsa->sa.sa_family == AF_INET6)
228 printf("%s is alive!\n", hostname);
233 #else /* FEATURE_FANCY_PING */
236 /* full(er) version */
238 #define OPT_STRING ("qvc:s:I:4" USE_PING6("6"))
241 OPT_VERBOSE = 1 << 1,
246 OPT_IPV6 = (1 << 6) * ENABLE_PING6,
252 struct sockaddr_in sin;
254 struct sockaddr_in6 sin6;
257 static len_and_sockaddr *source_lsa;
258 static int pingsock = -1;
259 static unsigned datalen; /* intentionally uninitialized to work around gcc bug */
263 static unsigned long ntransmitted, nreceived, nrepeats, pingcount;
265 static unsigned long tmin = ULONG_MAX, tmax, tsum;
266 static char rcvd_tbl[MAX_DUP_CHK / 8];
268 static const char *hostname;
269 static const char *dotted;
271 #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
272 #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
273 #define SET(bit) (A(bit) |= B(bit))
274 #define CLR(bit) (A(bit) &= (~B(bit)))
275 #define TST(bit) (A(bit) & B(bit))
277 /**************************************************************************/
279 static void pingstats(int junk ATTRIBUTE_UNUSED)
283 signal(SIGINT, SIG_IGN);
285 printf("\n--- %s ping statistics ---\n", hostname);
286 printf("%lu packets transmitted, ", ntransmitted);
287 printf("%lu packets received, ", nreceived);
289 printf("%lu duplicates, ", nrepeats);
291 ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
292 printf("%lu%% packet loss\n", ntransmitted);
294 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
295 tmin / 10, tmin % 10,
296 (tsum / (nreceived + nrepeats)) / 10,
297 (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
299 status = EXIT_SUCCESS;
301 status = EXIT_FAILURE;
305 static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
309 CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
312 /* sizeof(pingaddr) can be larger than real sa size, but I think
313 * it doesn't matter */
314 sz = sendto(pingsock, pkt, size_pkt, 0, &pingaddr.sa, sizeof(pingaddr));
316 bb_perror_msg_and_die("sendto");
318 bb_error_msg_and_die("ping wrote %d chars; %d expected", sz,
322 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
324 } else { /* done, wait for the last ping to come back */
325 /* todo, don't necessarily need to wait so long... */
326 signal(SIGALRM, pingstats);
331 static void sendping4(int junk ATTRIBUTE_UNUSED)
333 struct icmp *pkt = alloca(datalen + ICMP_MINLEN);
335 pkt->icmp_type = ICMP_ECHO;
338 pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
340 gettimeofday((struct timeval *) &pkt->icmp_dun, NULL);
341 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);
343 sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
346 static void sendping6(int junk ATTRIBUTE_UNUSED)
348 struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr));
350 pkt->icmp6_type = ICMP6_ECHO_REQUEST;
352 pkt->icmp6_cksum = 0;
353 pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
354 pkt->icmp6_id = myid;
355 gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);
357 sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr));
361 static const char *icmp_type_name(int id)
364 case ICMP_ECHOREPLY: return "Echo Reply";
365 case ICMP_DEST_UNREACH: return "Destination Unreachable";
366 case ICMP_SOURCE_QUENCH: return "Source Quench";
367 case ICMP_REDIRECT: return "Redirect (change route)";
368 case ICMP_ECHO: return "Echo Request";
369 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
370 case ICMP_PARAMETERPROB: return "Parameter Problem";
371 case ICMP_TIMESTAMP: return "Timestamp Request";
372 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
373 case ICMP_INFO_REQUEST: return "Information Request";
374 case ICMP_INFO_REPLY: return "Information Reply";
375 case ICMP_ADDRESS: return "Address Mask Request";
376 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
377 default: return "unknown ICMP type";
381 /* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
382 * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
383 #ifndef MLD_LISTENER_QUERY
384 # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
386 #ifndef MLD_LISTENER_REPORT
387 # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
389 #ifndef MLD_LISTENER_REDUCTION
390 # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
392 static const char *icmp6_type_name(int id)
395 case ICMP6_DST_UNREACH: return "Destination Unreachable";
396 case ICMP6_PACKET_TOO_BIG: return "Packet too big";
397 case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
398 case ICMP6_PARAM_PROB: return "Parameter Problem";
399 case ICMP6_ECHO_REPLY: return "Echo Reply";
400 case ICMP6_ECHO_REQUEST: return "Echo Request";
401 case MLD_LISTENER_QUERY: return "Listener Query";
402 case MLD_LISTENER_REPORT: return "Listener Report";
403 case MLD_LISTENER_REDUCTION: return "Listener Reduction";
404 default: return "unknown ICMP type";
409 static void unpack4(char *buf, int sz, struct sockaddr_in *from)
411 struct icmp *icmppkt;
413 struct timeval tv, *tp;
415 unsigned long triptime;
417 gettimeofday(&tv, NULL);
419 /* discard if too short */
420 if (sz < (datalen + ICMP_MINLEN))
423 /* check IP header */
424 iphdr = (struct iphdr *) buf;
425 hlen = iphdr->ihl << 2;
427 icmppkt = (struct icmp *) (buf + hlen);
428 if (icmppkt->icmp_id != myid)
429 return; /* not our ping */
431 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
432 uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
434 tp = (struct timeval *) icmppkt->icmp_data;
436 if ((tv.tv_usec -= tp->tv_usec) < 0) {
438 tv.tv_usec += 1000000;
440 tv.tv_sec -= tp->tv_sec;
442 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
449 if (TST(recv_seq % MAX_DUP_CHK)) {
454 SET(recv_seq % MAX_DUP_CHK);
458 if (option_mask32 & OPT_QUIET)
461 printf("%d bytes from %s: icmp_seq=%u", sz,
462 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
464 printf(" ttl=%d", iphdr->ttl);
465 printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
470 if (icmppkt->icmp_type != ICMP_ECHO)
471 bb_error_msg("warning: got ICMP %d (%s)",
473 icmp_type_name(icmppkt->icmp_type));
478 static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
480 struct icmp6_hdr *icmppkt;
481 struct timeval tv, *tp;
483 unsigned long triptime;
484 char buf[INET6_ADDRSTRLEN];
486 gettimeofday(&tv, NULL);
488 /* discard if too short */
489 if (sz < (datalen + sizeof(struct icmp6_hdr)))
492 icmppkt = (struct icmp6_hdr *) packet;
493 if (icmppkt->icmp6_id != myid)
494 return; /* not our ping */
496 if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
497 uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
499 tp = (struct timeval *) &icmppkt->icmp6_data8[4];
501 if ((tv.tv_usec -= tp->tv_usec) < 0) {
503 tv.tv_usec += 1000000;
505 tv.tv_sec -= tp->tv_sec;
507 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
514 if (TST(recv_seq % MAX_DUP_CHK)) {
519 SET(recv_seq % MAX_DUP_CHK);
523 if (option_mask32 & OPT_QUIET)
526 printf("%d bytes from %s: icmp6_seq=%u", sz,
527 inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr,
530 printf(" ttl=%d time=%lu.%lu ms", hoplimit,
531 triptime / 10, triptime % 10);
536 if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST)
537 bb_error_msg("warning: got ICMP %d (%s)",
539 icmp6_type_name(icmppkt->icmp6_type));
545 static void ping4(len_and_sockaddr *lsa)
547 char packet[datalen + MAXIPLEN + MAXICMPLEN];
550 pingsock = create_icmp_socket();
551 pingaddr.sin = lsa->sin;
553 xbind(pingsock, &lsa->sa, lsa->len);
555 /* enable broadcast pings */
556 setsockopt_broadcast(pingsock);
558 /* set recv buf for broadcast pings */
559 sockopt = 48 * 1024; /* explain why 48k? */
560 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
562 signal(SIGINT, pingstats);
564 /* start the ping's going ... */
567 /* listen for replies */
569 struct sockaddr_in from;
570 socklen_t fromlen = (socklen_t) sizeof(from);
573 c = recvfrom(pingsock, packet, sizeof(packet), 0,
574 (struct sockaddr *) &from, &fromlen);
577 bb_perror_msg("recvfrom");
580 unpack4(packet, c, &from);
581 if (pingcount > 0 && nreceived >= pingcount)
586 extern int BUG_bad_offsetof_icmp6_cksum(void);
587 static void ping6(len_and_sockaddr *lsa)
589 char packet[datalen + MAXIPLEN + MAXICMPLEN];
592 struct sockaddr_in6 from;
594 char control_buf[CMSG_SPACE(36)];
596 pingsock = create_icmp6_socket();
597 pingaddr.sin6 = lsa->sin6;
598 /* untested whether "-I addr" really works for IPv6: */
600 xbind(pingsock, &lsa->sa, lsa->len);
604 struct icmp6_filter filt;
605 if (!(option_mask32 & OPT_VERBOSE)) {
606 ICMP6_FILTER_SETBLOCKALL(&filt);
607 ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
609 ICMP6_FILTER_SETPASSALL(&filt);
611 if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
613 bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
615 #endif /*ICMP6_FILTER*/
617 /* enable broadcast pings */
618 setsockopt_broadcast(pingsock);
620 /* set recv buf for broadcast pings */
621 sockopt = 48 * 1024; /* explain why 48k? */
622 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
624 sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
625 if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
626 BUG_bad_offsetof_icmp6_cksum();
627 setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
629 /* request ttl info to be returned in ancillary data */
630 setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
633 pingaddr.sin6.sin6_scope_id = if_index;
635 signal(SIGINT, pingstats);
637 /* start the ping's going ... */
640 /* listen for replies */
641 msg.msg_name = &from;
642 msg.msg_namelen = sizeof(from);
645 msg.msg_control = control_buf;
646 iov.iov_base = packet;
647 iov.iov_len = sizeof(packet);
652 msg.msg_controllen = sizeof(control_buf);
654 c = recvmsg(pingsock, &msg, 0);
657 bb_perror_msg("recvfrom");
660 for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
661 if (mp->cmsg_level == SOL_IPV6
662 && mp->cmsg_type == IPV6_HOPLIMIT
663 /* don't check len - we trust the kernel: */
664 /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
666 hoplimit = *(int*)CMSG_DATA(mp);
669 unpack6(packet, c, &from, hoplimit);
670 if (pingcount > 0 && nreceived >= pingcount)
676 static void ping(len_and_sockaddr *lsa)
678 printf("PING %s (%s)", hostname, dotted);
681 xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len));
683 printf(": %d data bytes\n", datalen);
686 if (lsa->sa.sa_family == AF_INET6)
693 int ping_main(int argc, char **argv);
694 int ping_main(int argc, char **argv)
696 len_and_sockaddr *lsa;
697 char *opt_c, *opt_s, *opt_I;
698 USE_PING6(sa_family_t af = AF_UNSPEC;)
700 datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
702 /* exactly one argument needed, -v and -q don't mix */
703 opt_complementary = "=1:q--v:v--q";
704 getopt32(argc, argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
705 if (option_mask32 & OPT_c) pingcount = xatoul(opt_c); // -c
706 if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s
707 if (option_mask32 & OPT_I) { // -I
708 if_index = if_nametoindex(opt_I);
710 /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
711 /* (ping doesn't support source IPv6 addresses yet anyway) */
712 source_lsa = xdotted2sockaddr(opt_I, 0);
715 myid = (int16_t) getpid();
716 hostname = argv[optind];
718 if (option_mask32 & OPT_IPV4)
720 if (option_mask32 & OPT_IPV6)
722 lsa = xhost_and_af2sockaddr(hostname, 0, af);
724 lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
727 if (source_lsa && source_lsa->sa.sa_family != lsa->sa.sa_family)
728 /* leaking it here... */
731 dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len);
736 #endif /* FEATURE_FANCY_PING */
740 int ping6_main(int argc, char **argv);
741 int ping6_main(int argc, char **argv)
743 argv[0] = (char*)"-6";
744 return ping_main(argc + 1, argv - 1);
749 * Copyright (c) 1989 The Regents of the University of California.
750 * All rights reserved.
752 * This code is derived from software contributed to Berkeley by
755 * Redistribution and use in source and binary forms, with or without
756 * modification, are permitted provided that the following conditions
758 * 1. Redistributions of source code must retain the above copyright
759 * notice, this list of conditions and the following disclaimer.
760 * 2. Redistributions in binary form must reproduce the above copyright
761 * notice, this list of conditions and the following disclaimer in the
762 * documentation and/or other materials provided with the distribution.
764 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
765 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
767 * 4. Neither the name of the University nor the names of its contributors
768 * may be used to endorse or promote products derived from this software
769 * without specific prior written permission.
771 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
772 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
773 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
774 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
775 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
776 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
777 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
778 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
779 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
780 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF