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1/* vi: set sw=4 ts=4: */
2/*
3 * $Id: ping.c,v 1.46 2001/07/17 01:12:36 andersen Exp $
4 * Mini ping implementation for busybox
5 *
6 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This version of ping is adapted from the ping in netkit-base 0.10,
23 * which is:
24 *
25 * Copyright (c) 1989 The Regents of the University of California.
26 * All rights reserved.
27 *
28 * This code is derived from software contributed to Berkeley by
29 * Mike Muuss.
30 *
31 * Original copyright notice is retained at the end of this file.
32 */
33
34#include <sys/param.h>
35#include <sys/socket.h>
36#include <sys/file.h>
37#include <sys/time.h>
38#include <sys/times.h>
39#include <sys/signal.h>
40
41#include <netinet/in.h>
42#include <netinet/ip.h>
43#include <netinet/ip_icmp.h>
44#include <arpa/inet.h>
45#include <netdb.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <errno.h>
49#include <unistd.h>
50#include <string.h>
51#include <stdlib.h>
52#include "busybox.h"
53
54
55/* It turns out that libc5 doesn't have proper icmp support
56 * built into it header files, so we have to supplement it */
57#if __GNU_LIBRARY__ < 5
58static const int ICMP_MINLEN = 8; /* abs minimum */
59
60struct icmp_ra_addr
61{
62 u_int32_t ira_addr;
63 u_int32_t ira_preference;
64};
65
66
67struct icmp
68{
69 u_int8_t icmp_type; /* type of message, see below */
70 u_int8_t icmp_code; /* type sub code */
71 u_int16_t icmp_cksum; /* ones complement checksum of struct */
72 union
73 {
74 u_char ih_pptr; /* ICMP_PARAMPROB */
75 struct in_addr ih_gwaddr; /* gateway address */
76 struct ih_idseq /* echo datagram */
77 {
78 u_int16_t icd_id;
79 u_int16_t icd_seq;
80 } ih_idseq;
81 u_int32_t ih_void;
82
83 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
84 struct ih_pmtu
85 {
86 u_int16_t ipm_void;
87 u_int16_t ipm_nextmtu;
88 } ih_pmtu;
89
90 struct ih_rtradv
91 {
92 u_int8_t irt_num_addrs;
93 u_int8_t irt_wpa;
94 u_int16_t irt_lifetime;
95 } ih_rtradv;
96 } icmp_hun;
97#define icmp_pptr icmp_hun.ih_pptr
98#define icmp_gwaddr icmp_hun.ih_gwaddr
99#define icmp_id icmp_hun.ih_idseq.icd_id
100#define icmp_seq icmp_hun.ih_idseq.icd_seq
101#define icmp_void icmp_hun.ih_void
102#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
103#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
104#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
105#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
106#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
107 union
108 {
109 struct
110 {
111 u_int32_t its_otime;
112 u_int32_t its_rtime;
113 u_int32_t its_ttime;
114 } id_ts;
115 struct
116 {
117 struct ip idi_ip;
118 /* options and then 64 bits of data */
119 } id_ip;
120 struct icmp_ra_addr id_radv;
121 u_int32_t id_mask;
122 u_int8_t id_data[1];
123 } icmp_dun;
124#define icmp_otime icmp_dun.id_ts.its_otime
125#define icmp_rtime icmp_dun.id_ts.its_rtime
126#define icmp_ttime icmp_dun.id_ts.its_ttime
127#define icmp_ip icmp_dun.id_ip.idi_ip
128#define icmp_radv icmp_dun.id_radv
129#define icmp_mask icmp_dun.id_mask
130#define icmp_data icmp_dun.id_data
131};
132#endif
133
134static const int DEFDATALEN = 56;
135static const int MAXIPLEN = 60;
136static const int MAXICMPLEN = 76;
137static const int MAXPACKET = 65468;
138#define MAX_DUP_CHK (8 * 128)
139static const int MAXWAIT = 10;
140static const int PINGINTERVAL = 1; /* second */
141
142#define O_QUIET (1 << 0)
143
144#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
145#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
146#define SET(bit) (A(bit) |= B(bit))
147#define CLR(bit) (A(bit) &= (~B(bit)))
148#define TST(bit) (A(bit) & B(bit))
149
150static void ping(const char *host);
151
152/* common routines */
153static int in_cksum(unsigned short *buf, int sz)
154{
155 int nleft = sz;
156 int sum = 0;
157 unsigned short *w = buf;
158 unsigned short ans = 0;
159
160 while (nleft > 1) {
161 sum += *w++;
162 nleft -= 2;
163 }
164
165 if (nleft == 1) {
166 *(unsigned char *) (&ans) = *(unsigned char *) w;
167 sum += ans;
168 }
169
170 sum = (sum >> 16) + (sum & 0xFFFF);
171 sum += (sum >> 16);
172 ans = ~sum;
173 return (ans);
174}
175
176/* simple version */
177#ifndef BB_FEATURE_FANCY_PING
178static char *hostname = NULL;
179
180static void noresp(int ign)
181{
182 printf("No response from %s\n", hostname);
183 exit(0);
184}
185
186static void ping(const char *host)
187{
188 struct hostent *h;
189 struct sockaddr_in pingaddr;
190 struct icmp *pkt;
191 int pingsock, c;
192 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
193
194 pingsock = create_icmp_socket();
195
196 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
197
198 pingaddr.sin_family = AF_INET;
199 h = xgethostbyname(host);
200 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
201 hostname = h->h_name;
202
203 pkt = (struct icmp *) packet;
204 memset(pkt, 0, sizeof(packet));
205 pkt->icmp_type = ICMP_ECHO;
206 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
207
208 c = sendto(pingsock, packet, sizeof(packet), 0,
209 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
210
211 if (c < 0 || c != sizeof(packet))
212 perror_msg_and_die("sendto");
213
214 signal(SIGALRM, noresp);
215 alarm(5); /* give the host 5000ms to respond */
216 /* listen for replies */
217 while (1) {
218 struct sockaddr_in from;
219 size_t fromlen = sizeof(from);
220
221 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
222 (struct sockaddr *) &from, &fromlen)) < 0) {
223 if (errno == EINTR)
224 continue;
225 perror_msg("recvfrom");
226 continue;
227 }
228 if (c >= 76) { /* ip + icmp */
229 struct iphdr *iphdr = (struct iphdr *) packet;
230
231 pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
232 if (pkt->icmp_type == ICMP_ECHOREPLY)
233 break;
234 }
235 }
236 printf("%s is alive!\n", hostname);
237 return;
238}
239
240extern int ping_main(int argc, char **argv)
241{
242 argc--;
243 argv++;
244 if (argc < 1)
245 show_usage();
246 ping(*argv);
247 return EXIT_SUCCESS;
248}
249
250#else /* ! BB_FEATURE_FANCY_PING */
251/* full(er) version */
252static char *hostname = NULL;
253static struct sockaddr_in pingaddr;
254static int pingsock = -1;
255static int datalen; /* intentionally uninitialized to work around gcc bug */
256
257static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
258static int myid = 0, options = 0;
259static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
260static char rcvd_tbl[MAX_DUP_CHK / 8];
261
262static void sendping(int);
263static void pingstats(int);
264static void unpack(char *, int, struct sockaddr_in *);
265
266/**************************************************************************/
267
268static void pingstats(int junk)
269{
270 int status;
271
272 signal(SIGINT, SIG_IGN);
273
274 printf("\n--- %s ping statistics ---\n", hostname);
275 printf("%ld packets transmitted, ", ntransmitted);
276 printf("%ld packets received, ", nreceived);
277 if (nrepeats)
278 printf("%ld duplicates, ", nrepeats);
279 if (ntransmitted)
280 printf("%ld%% packet loss\n",
281 (ntransmitted - nreceived) * 100 / ntransmitted);
282 if (nreceived)
283 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
284 tmin / 10, tmin % 10,
285 (tsum / (nreceived + nrepeats)) / 10,
286 (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
287 if (nreceived != 0)
288 status = EXIT_SUCCESS;
289 else
290 status = EXIT_FAILURE;
291 exit(status);
292}
293
294static void sendping(int junk)
295{
296 struct icmp *pkt;
297 int i;
298 char packet[datalen + 8];
299
300 pkt = (struct icmp *) packet;
301
302 pkt->icmp_type = ICMP_ECHO;
303 pkt->icmp_code = 0;
304 pkt->icmp_cksum = 0;
305 pkt->icmp_seq = ntransmitted++;
306 pkt->icmp_id = myid;
307 CLR(pkt->icmp_seq % MAX_DUP_CHK);
308
309 gettimeofday((struct timeval *) &packet[8], NULL);
310 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
311
312 i = sendto(pingsock, packet, sizeof(packet), 0,
313 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
314
315 if (i < 0)
316 perror_msg_and_die("sendto");
317 else if ((size_t)i != sizeof(packet))
318 error_msg_and_die("ping wrote %d chars; %d expected", i,
319 (int)sizeof(packet));
320
321 signal(SIGALRM, sendping);
322 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
323 alarm(PINGINTERVAL);
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);
327 alarm(MAXWAIT);
328 }
329}
330
331static char *icmp_type_name (int id)
332{
333 switch (id) {
334 case ICMP_ECHOREPLY: return "Echo Reply";
335 case ICMP_DEST_UNREACH: return "Destination Unreachable";
336 case ICMP_SOURCE_QUENCH: return "Source Quench";
337 case ICMP_REDIRECT: return "Redirect (change route)";
338 case ICMP_ECHO: return "Echo Request";
339 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
340 case ICMP_PARAMETERPROB: return "Parameter Problem";
341 case ICMP_TIMESTAMP: return "Timestamp Request";
342 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
343 case ICMP_INFO_REQUEST: return "Information Request";
344 case ICMP_INFO_REPLY: return "Information Reply";
345 case ICMP_ADDRESS: return "Address Mask Request";
346 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
347 default: return "unknown ICMP type";
348 }
349}
350
351static void unpack(char *buf, int sz, struct sockaddr_in *from)
352{
353 struct icmp *icmppkt;
354 struct iphdr *iphdr;
355 struct timeval tv, *tp;
356 int hlen, dupflag;
357 unsigned long triptime;
358
359 gettimeofday(&tv, NULL);
360
361 /* check IP header */
362 iphdr = (struct iphdr *) buf;
363 hlen = iphdr->ihl << 2;
364 /* discard if too short */
365 if (sz < (datalen + ICMP_MINLEN))
366 return;
367
368 sz -= hlen;
369 icmppkt = (struct icmp *) (buf + hlen);
370
371 if (icmppkt->icmp_id != myid)
372 return; /* not our ping */
373
374 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
375 ++nreceived;
376 tp = (struct timeval *) icmppkt->icmp_data;
377
378 if ((tv.tv_usec -= tp->tv_usec) < 0) {
379 --tv.tv_sec;
380 tv.tv_usec += 1000000;
381 }
382 tv.tv_sec -= tp->tv_sec;
383
384 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
385 tsum += triptime;
386 if (triptime < tmin)
387 tmin = triptime;
388 if (triptime > tmax)
389 tmax = triptime;
390
391 if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
392 ++nrepeats;
393 --nreceived;
394 dupflag = 1;
395 } else {
396 SET(icmppkt->icmp_seq % MAX_DUP_CHK);
397 dupflag = 0;
398 }
399
400 if (options & O_QUIET)
401 return;
402
403 printf("%d bytes from %s: icmp_seq=%u", sz,
404 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
405 icmppkt->icmp_seq);
406 printf(" ttl=%d", iphdr->ttl);
407 printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
408 if (dupflag)
409 printf(" (DUP!)");
410 printf("\n");
411 } else
412 if (icmppkt->icmp_type != ICMP_ECHO)
413 error_msg("Warning: Got ICMP %d (%s)",
414 icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type));
415}
416
417static void ping(const char *host)
418{
419 struct hostent *h;
420 char buf[MAXHOSTNAMELEN];
421 char packet[datalen + MAXIPLEN + MAXICMPLEN];
422 int sockopt;
423
424 pingsock = create_icmp_socket();
425
426 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
427
428 pingaddr.sin_family = AF_INET;
429 h = xgethostbyname(host);
430 if (h->h_addrtype != AF_INET)
431 error_msg_and_die("unknown address type; only AF_INET is currently supported.");
432
433 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
434 strncpy(buf, h->h_name, sizeof(buf) - 1);
435 hostname = buf;
436
437 /* enable broadcast pings */
438 sockopt = 1;
439 setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
440 sizeof(sockopt));
441
442 /* set recv buf for broadcast pings */
443 sockopt = 48 * 1024;
444 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
445 sizeof(sockopt));
446
447 printf("PING %s (%s): %d data bytes\n",
448 hostname,
449 inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
450 datalen);
451
452 signal(SIGINT, pingstats);
453
454 /* start the ping's going ... */
455 sendping(0);
456
457 /* listen for replies */
458 while (1) {
459 struct sockaddr_in from;
460 socklen_t fromlen = (socklen_t) sizeof(from);
461 int c;
462
463 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
464 (struct sockaddr *) &from, &fromlen)) < 0) {
465 if (errno == EINTR)
466 continue;
467 perror_msg("recvfrom");
468 continue;
469 }
470 unpack(packet, c, &from);
471 if (pingcount > 0 && nreceived >= pingcount)
472 break;
473 }
474 pingstats(0);
475}
476
477extern int ping_main(int argc, char **argv)
478{
479 char *thisarg;
480
481 datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
482
483 argc--;
484 argv++;
485 options = 0;
486 /* Parse any options */
487 while (argc >= 1 && **argv == '-') {
488 thisarg = *argv;
489 thisarg++;
490 switch (*thisarg) {
491 case 'q':
492 options |= O_QUIET;
493 break;
494 case 'c':
495 if (--argc <= 0)
496 show_usage();
497 argv++;
498 pingcount = atoi(*argv);
499 break;
500 case 's':
501 if (--argc <= 0)
502 show_usage();
503 argv++;
504 datalen = atoi(*argv);
505 break;
506 default:
507 show_usage();
508 }
509 argc--;
510 argv++;
511 }
512 if (argc < 1)
513 show_usage();
514
515 myid = getpid() & 0xFFFF;
516 ping(*argv);
517 return EXIT_SUCCESS;
518}
519#endif /* ! BB_FEATURE_FANCY_PING */
520
521/*
522 * Copyright (c) 1989 The Regents of the University of California.
523 * All rights reserved.
524 *
525 * This code is derived from software contributed to Berkeley by
526 * Mike Muuss.
527 *
528 * Redistribution and use in source and binary forms, with or without
529 * modification, are permitted provided that the following conditions
530 * are met:
531 * 1. Redistributions of source code must retain the above copyright
532 * notice, this list of conditions and the following disclaimer.
533 * 2. Redistributions in binary form must reproduce the above copyright
534 * notice, this list of conditions and the following disclaimer in the
535 * documentation and/or other materials provided with the distribution.
536 *
537 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
538 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
539 *
540 * 4. Neither the name of the University nor the names of its contributors
541 * may be used to endorse or promote products derived from this software
542 * without specific prior written permission.
543 *
544 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
545 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
546 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
547 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
548 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
549 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
550 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
551 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
552 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
553 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
554 * SUCH DAMAGE.
555 */
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