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 tmin = UINT_MAX, tmax;
266 static unsigned long tsum;
267 static char rcvd_tbl[MAX_DUP_CHK / 8];
269 static const char *hostname;
270 static const char *dotted;
272 #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
273 #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
274 #define SET(bit) (A(bit) |= B(bit))
275 #define CLR(bit) (A(bit) &= (~B(bit)))
276 #define TST(bit) (A(bit) & B(bit))
278 /**************************************************************************/
280 static void pingstats(int junk ATTRIBUTE_UNUSED)
282 signal(SIGINT, SIG_IGN);
284 printf("\n--- %s ping statistics ---\n", hostname);
285 printf("%lu packets transmitted, ", ntransmitted);
286 printf("%lu packets received, ", nreceived);
288 printf("%lu duplicates, ", nrepeats);
290 ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
291 printf("%lu%% packet loss\n", ntransmitted);
292 if (tmin != UINT_MAX)
293 printf("round-trip min/avg/max = %u.%u/%lu.%lu/%u.%u ms\n",
294 tmin / 10, tmin % 10,
295 (tsum / (nreceived + nrepeats)) / 10,
296 (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
297 exit(nreceived == 0); /* (nreceived == 0) is true (1) -- 'failure' */
300 static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
304 CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
307 /* sizeof(pingaddr) can be larger than real sa size, but I think
308 * it doesn't matter */
309 sz = sendto(pingsock, pkt, size_pkt, 0, &pingaddr.sa, sizeof(pingaddr));
311 bb_perror_msg_and_die("sendto");
313 bb_error_msg_and_die("ping wrote %d chars; %d expected", sz,
317 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
319 } else { /* done, wait for the last ping to come back */
320 /* todo, don't necessarily need to wait so long... */
321 signal(SIGALRM, pingstats);
326 static void sendping4(int junk ATTRIBUTE_UNUSED)
328 struct icmp *pkt = alloca(datalen + ICMP_MINLEN);
330 pkt->icmp_type = ICMP_ECHO;
333 pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
335 gettimeofday((struct timeval *) &pkt->icmp_dun, NULL);
336 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);
338 sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
341 static void sendping6(int junk ATTRIBUTE_UNUSED)
343 struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr));
345 pkt->icmp6_type = ICMP6_ECHO_REQUEST;
347 pkt->icmp6_cksum = 0;
348 pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
349 pkt->icmp6_id = myid;
350 gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);
352 sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr));
356 static const char *icmp_type_name(int id)
359 case ICMP_ECHOREPLY: return "Echo Reply";
360 case ICMP_DEST_UNREACH: return "Destination Unreachable";
361 case ICMP_SOURCE_QUENCH: return "Source Quench";
362 case ICMP_REDIRECT: return "Redirect (change route)";
363 case ICMP_ECHO: return "Echo Request";
364 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
365 case ICMP_PARAMETERPROB: return "Parameter Problem";
366 case ICMP_TIMESTAMP: return "Timestamp Request";
367 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
368 case ICMP_INFO_REQUEST: return "Information Request";
369 case ICMP_INFO_REPLY: return "Information Reply";
370 case ICMP_ADDRESS: return "Address Mask Request";
371 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
372 default: return "unknown ICMP type";
376 /* RFC3542 changed some definitions from RFC2292 for no good reason, whee!
377 * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
378 #ifndef MLD_LISTENER_QUERY
379 # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
381 #ifndef MLD_LISTENER_REPORT
382 # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
384 #ifndef MLD_LISTENER_REDUCTION
385 # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
387 static const char *icmp6_type_name(int id)
390 case ICMP6_DST_UNREACH: return "Destination Unreachable";
391 case ICMP6_PACKET_TOO_BIG: return "Packet too big";
392 case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
393 case ICMP6_PARAM_PROB: return "Parameter Problem";
394 case ICMP6_ECHO_REPLY: return "Echo Reply";
395 case ICMP6_ECHO_REQUEST: return "Echo Request";
396 case MLD_LISTENER_QUERY: return "Listener Query";
397 case MLD_LISTENER_REPORT: return "Listener Report";
398 case MLD_LISTENER_REDUCTION: return "Listener Reduction";
399 default: return "unknown ICMP type";
404 static void unpack_tail(int sz, struct timeval *tp,
405 const char *from_str,
406 uint16_t recv_seq, int ttl)
408 const char *dupmsg = " (DUP!)";
409 unsigned triptime = triptime; /* for gcc */
416 gettimeofday(&tv, NULL);
417 tv.tv_usec -= tp->tv_usec;
418 if (tv.tv_usec < 0) {
420 tv.tv_usec += 1000000;
422 tv.tv_sec -= tp->tv_sec;
424 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
432 if (TST(recv_seq % MAX_DUP_CHK)) {
436 SET(recv_seq % MAX_DUP_CHK);
440 if (option_mask32 & OPT_QUIET)
443 printf("%d bytes from %s: seq=%u ttl=%d", sz,
444 from_str, recv_seq, ttl);
446 printf(" time=%u.%u ms", triptime / 10, triptime % 10);
450 static void unpack4(char *buf, int sz, struct sockaddr_in *from)
452 struct icmp *icmppkt;
456 /* discard if too short */
457 if (sz < (datalen + ICMP_MINLEN))
460 /* check IP header */
461 iphdr = (struct iphdr *) buf;
462 hlen = iphdr->ihl << 2;
464 icmppkt = (struct icmp *) (buf + hlen);
465 if (icmppkt->icmp_id != myid)
466 return; /* not our ping */
468 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
469 uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
470 struct timeval *tp = NULL;
472 if (sz >= ICMP_MINLEN + sizeof(struct timeval))
473 tp = (struct timeval *) icmppkt->icmp_data;
475 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
476 recv_seq, iphdr->ttl);
477 } else if (icmppkt->icmp_type != ICMP_ECHO) {
478 bb_error_msg("warning: got ICMP %d (%s)",
480 icmp_type_name(icmppkt->icmp_type));
484 static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
486 struct icmp6_hdr *icmppkt;
487 char buf[INET6_ADDRSTRLEN];
489 /* discard if too short */
490 if (sz < (datalen + sizeof(struct icmp6_hdr)))
493 icmppkt = (struct icmp6_hdr *) packet;
494 if (icmppkt->icmp6_id != myid)
495 return; /* not our ping */
497 if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
498 uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
499 struct timeval *tp = NULL;
501 if (sz >= sizeof(struct icmp6_hdr) + sizeof(struct timeval))
502 tp = (struct timeval *) &icmppkt->icmp6_data8[4];
504 inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr,
507 } else if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST) {
508 bb_error_msg("warning: got ICMP %d (%s)",
510 icmp6_type_name(icmppkt->icmp6_type));
515 static void ping4(len_and_sockaddr *lsa)
517 char packet[datalen + MAXIPLEN + MAXICMPLEN];
520 pingsock = create_icmp_socket();
521 pingaddr.sin = lsa->sin;
523 xbind(pingsock, &lsa->sa, lsa->len);
525 /* enable broadcast pings */
526 setsockopt_broadcast(pingsock);
528 /* set recv buf for broadcast pings */
529 sockopt = 48 * 1024; /* explain why 48k? */
530 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
532 signal(SIGINT, pingstats);
534 /* start the ping's going ... */
537 /* listen for replies */
539 struct sockaddr_in from;
540 socklen_t fromlen = (socklen_t) sizeof(from);
543 c = recvfrom(pingsock, packet, sizeof(packet), 0,
544 (struct sockaddr *) &from, &fromlen);
547 bb_perror_msg("recvfrom");
550 unpack4(packet, c, &from);
551 if (pingcount > 0 && nreceived >= pingcount)
556 extern int BUG_bad_offsetof_icmp6_cksum(void);
557 static void ping6(len_and_sockaddr *lsa)
559 char packet[datalen + MAXIPLEN + MAXICMPLEN];
562 struct sockaddr_in6 from;
564 char control_buf[CMSG_SPACE(36)];
566 pingsock = create_icmp6_socket();
567 pingaddr.sin6 = lsa->sin6;
568 /* untested whether "-I addr" really works for IPv6: */
570 xbind(pingsock, &lsa->sa, lsa->len);
574 struct icmp6_filter filt;
575 if (!(option_mask32 & OPT_VERBOSE)) {
576 ICMP6_FILTER_SETBLOCKALL(&filt);
577 ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
579 ICMP6_FILTER_SETPASSALL(&filt);
581 if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
583 bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
585 #endif /*ICMP6_FILTER*/
587 /* enable broadcast pings */
588 setsockopt_broadcast(pingsock);
590 /* set recv buf for broadcast pings */
591 sockopt = 48 * 1024; /* explain why 48k? */
592 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
594 sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
595 if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
596 BUG_bad_offsetof_icmp6_cksum();
597 setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
599 /* request ttl info to be returned in ancillary data */
600 setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
603 pingaddr.sin6.sin6_scope_id = if_index;
605 signal(SIGINT, pingstats);
607 /* start the ping's going ... */
610 /* listen for replies */
611 msg.msg_name = &from;
612 msg.msg_namelen = sizeof(from);
615 msg.msg_control = control_buf;
616 iov.iov_base = packet;
617 iov.iov_len = sizeof(packet);
622 msg.msg_controllen = sizeof(control_buf);
624 c = recvmsg(pingsock, &msg, 0);
627 bb_perror_msg("recvfrom");
630 for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
631 if (mp->cmsg_level == SOL_IPV6
632 && mp->cmsg_type == IPV6_HOPLIMIT
633 /* don't check len - we trust the kernel: */
634 /* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
636 hoplimit = *(int*)CMSG_DATA(mp);
639 unpack6(packet, c, &from, hoplimit);
640 if (pingcount > 0 && nreceived >= pingcount)
646 static void ping(len_and_sockaddr *lsa)
648 printf("PING %s (%s)", hostname, dotted);
651 xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len));
653 printf(": %d data bytes\n", datalen);
656 if (lsa->sa.sa_family == AF_INET6)
663 int ping_main(int argc, char **argv);
664 int ping_main(int argc, char **argv)
666 len_and_sockaddr *lsa;
667 char *opt_c, *opt_s, *opt_I;
668 USE_PING6(sa_family_t af = AF_UNSPEC;)
670 datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
672 /* exactly one argument needed, -v and -q don't mix */
673 opt_complementary = "=1:q--v:v--q";
674 getopt32(argc, argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
675 if (option_mask32 & OPT_c) pingcount = xatoul(opt_c); // -c
676 if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s
677 if (option_mask32 & OPT_I) { // -I
678 if_index = if_nametoindex(opt_I);
680 /* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
681 /* (ping doesn't support source IPv6 addresses yet anyway) */
682 source_lsa = xdotted2sockaddr(opt_I, 0);
685 myid = (int16_t) getpid();
686 hostname = argv[optind];
688 if (option_mask32 & OPT_IPV4)
690 if (option_mask32 & OPT_IPV6)
692 lsa = xhost_and_af2sockaddr(hostname, 0, af);
694 lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
697 if (source_lsa && source_lsa->sa.sa_family != lsa->sa.sa_family)
698 /* leaking it here... */
701 dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len);
706 #endif /* FEATURE_FANCY_PING */
710 int ping6_main(int argc, char **argv);
711 int ping6_main(int argc, char **argv)
713 argv[0] = (char*)"-6";
714 return ping_main(argc + 1, argv - 1);
719 * Copyright (c) 1989 The Regents of the University of California.
720 * All rights reserved.
722 * This code is derived from software contributed to Berkeley by
725 * Redistribution and use in source and binary forms, with or without
726 * modification, are permitted provided that the following conditions
728 * 1. Redistributions of source code must retain the above copyright
729 * notice, this list of conditions and the following disclaimer.
730 * 2. Redistributions in binary form must reproduce the above copyright
731 * notice, this list of conditions and the following disclaimer in the
732 * documentation and/or other materials provided with the distribution.
734 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
735 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
737 * 4. Neither the name of the University nor the names of its contributors
738 * may be used to endorse or promote products derived from this software
739 * without specific prior written permission.
741 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
742 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
743 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
744 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
745 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
746 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
747 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
748 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
749 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
750 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF