1 /* vi: set sw=4 ts=4: */
3 * $Id: ping.c,v 1.43 2001/05/21 20:30:51 andersen Exp $
4 * Mini ping implementation for busybox
6 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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.
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.
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
22 * This version of ping is adapted from the ping in netkit-base 0.10,
25 * Copyright (c) 1989 The Regents of the University of California.
26 * All rights reserved.
28 * This code is derived from software contributed to Berkeley by
31 * Original copyright notice is retained at the end of this file.
34 #include <sys/param.h>
35 #include <sys/socket.h>
38 #include <sys/times.h>
39 #include <sys/signal.h>
41 #include <netinet/in.h>
42 #include <netinet/ip.h>
43 #include <netinet/ip_icmp.h>
44 #include <arpa/inet.h>
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
58 static const int ICMP_MINLEN = 8; /* abs minimum */
63 u_int32_t ira_preference;
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 */
74 u_char ih_pptr; /* ICMP_PARAMPROB */
75 struct in_addr ih_gwaddr; /* gateway address */
76 struct ih_idseq /* echo datagram */
83 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
87 u_int16_t ipm_nextmtu;
92 u_int8_t irt_num_addrs;
94 u_int16_t irt_lifetime;
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
118 /* options and then 64 bits of data */
120 struct icmp_ra_addr id_radv;
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
134 static const int DEFDATALEN = 56;
135 static const int MAXIPLEN = 60;
136 static const int MAXICMPLEN = 76;
137 static const int MAXPACKET = 65468;
138 #define MAX_DUP_CHK (8 * 128)
139 static const int MAXWAIT = 10;
140 static const int PINGINTERVAL = 1; /* second */
142 #define O_QUIET (1 << 0)
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))
150 static void ping(const char *host);
152 /* common routines */
153 static int in_cksum(unsigned short *buf, int sz)
157 unsigned short *w = buf;
158 unsigned short ans = 0;
166 *(unsigned char *) (&ans) = *(unsigned char *) w;
170 sum = (sum >> 16) + (sum & 0xFFFF);
177 #ifndef BB_FEATURE_FANCY_PING
178 static char *hostname = NULL;
180 static void noresp(int ign)
182 printf("No response from %s\n", hostname);
186 static void ping(const char *host)
189 struct sockaddr_in pingaddr;
192 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
194 if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) /* 1 == ICMP */
195 perror_msg_and_die("creating a raw socket");
197 /* drop root privs if running setuid */
200 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
202 pingaddr.sin_family = AF_INET;
203 h = xgethostbyname(host);
204 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
205 hostname = h->h_name;
207 pkt = (struct icmp *) packet;
208 memset(pkt, 0, sizeof(packet));
209 pkt->icmp_type = ICMP_ECHO;
210 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
212 c = sendto(pingsock, packet, sizeof(packet), 0,
213 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
215 if (c < 0 || c != sizeof(packet))
216 perror_msg_and_die("sendto");
218 signal(SIGALRM, noresp);
219 alarm(5); /* give the host 5000ms to respond */
220 /* listen for replies */
222 struct sockaddr_in from;
223 size_t fromlen = sizeof(from);
225 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
226 (struct sockaddr *) &from, &fromlen)) < 0) {
229 perror_msg("recvfrom");
232 if (c >= 76) { /* ip + icmp */
233 struct iphdr *iphdr = (struct iphdr *) packet;
235 pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
236 if (pkt->icmp_type == ICMP_ECHOREPLY)
240 printf("%s is alive!\n", hostname);
244 extern int ping_main(int argc, char **argv)
254 #else /* ! BB_FEATURE_FANCY_PING */
255 /* full(er) version */
256 static char *hostname = NULL;
257 static struct sockaddr_in pingaddr;
258 static int pingsock = -1;
259 static int datalen; /* intentionally uninitialized to work around gcc bug */
261 static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
262 static int myid = 0, options = 0;
263 static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
264 static char rcvd_tbl[MAX_DUP_CHK / 8];
266 static void sendping(int);
267 static void pingstats(int);
268 static void unpack(char *, int, struct sockaddr_in *);
270 /**************************************************************************/
272 static void pingstats(int junk)
276 signal(SIGINT, SIG_IGN);
278 printf("\n--- %s ping statistics ---\n", hostname);
279 printf("%ld packets transmitted, ", ntransmitted);
280 printf("%ld packets received, ", nreceived);
282 printf("%ld duplicates, ", nrepeats);
284 printf("%ld%% packet loss\n",
285 (ntransmitted - nreceived) * 100 / ntransmitted);
287 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
288 tmin / 10, tmin % 10,
289 (tsum / (nreceived + nrepeats)) / 10,
290 (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
292 status = EXIT_SUCCESS;
294 status = EXIT_FAILURE;
298 static void sendping(int junk)
302 char packet[datalen + 8];
304 pkt = (struct icmp *) packet;
306 pkt->icmp_type = ICMP_ECHO;
309 pkt->icmp_seq = ntransmitted++;
311 CLR(pkt->icmp_seq % MAX_DUP_CHK);
313 gettimeofday((struct timeval *) &packet[8], NULL);
314 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
316 i = sendto(pingsock, packet, sizeof(packet), 0,
317 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
320 perror_msg_and_die("sendto");
321 else if ((size_t)i != sizeof(packet))
322 error_msg_and_die("ping wrote %d chars; %d expected", i,
323 (int)sizeof(packet));
325 signal(SIGALRM, sendping);
326 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
328 } else { /* done, wait for the last ping to come back */
329 /* todo, don't necessarily need to wait so long... */
330 signal(SIGALRM, pingstats);
335 static char *icmp_type_name (int id)
338 case ICMP_ECHOREPLY: return "Echo Reply";
339 case ICMP_DEST_UNREACH: return "Destination Unreachable";
340 case ICMP_SOURCE_QUENCH: return "Source Quench";
341 case ICMP_REDIRECT: return "Redirect (change route)";
342 case ICMP_ECHO: return "Echo Request";
343 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
344 case ICMP_PARAMETERPROB: return "Parameter Problem";
345 case ICMP_TIMESTAMP: return "Timestamp Request";
346 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
347 case ICMP_INFO_REQUEST: return "Information Request";
348 case ICMP_INFO_REPLY: return "Information Reply";
349 case ICMP_ADDRESS: return "Address Mask Request";
350 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
351 default: return "unknown ICMP type";
355 static void unpack(char *buf, int sz, struct sockaddr_in *from)
357 struct icmp *icmppkt;
359 struct timeval tv, *tp;
361 unsigned long triptime;
363 gettimeofday(&tv, NULL);
365 /* check IP header */
366 iphdr = (struct iphdr *) buf;
367 hlen = iphdr->ihl << 2;
368 /* discard if too short */
369 if (sz < (datalen + ICMP_MINLEN))
373 icmppkt = (struct icmp *) (buf + hlen);
375 if (icmppkt->icmp_id != myid)
376 return; /* not our ping */
378 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
380 tp = (struct timeval *) icmppkt->icmp_data;
382 if ((tv.tv_usec -= tp->tv_usec) < 0) {
384 tv.tv_usec += 1000000;
386 tv.tv_sec -= tp->tv_sec;
388 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
395 if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
400 SET(icmppkt->icmp_seq % MAX_DUP_CHK);
404 if (options & O_QUIET)
407 printf("%d bytes from %s: icmp_seq=%u", sz,
408 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
410 printf(" ttl=%d", iphdr->ttl);
411 printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
416 if (icmppkt->icmp_type != ICMP_ECHO)
417 error_msg("Warning: Got ICMP %d (%s)",
418 icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type));
421 static void ping(const char *host)
423 struct protoent *proto;
425 char buf[MAXHOSTNAMELEN];
426 char packet[datalen + MAXIPLEN + MAXICMPLEN];
429 proto = getprotobyname("icmp");
430 /* if getprotobyname failed, just silently force
431 * proto->p_proto to have the correct value for "icmp" */
432 if ((pingsock = socket(AF_INET, SOCK_RAW,
433 (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */
435 error_msg_and_die("permission denied. (are you root?)");
437 perror_msg_and_die("creating a raw socket");
440 /* drop root privs if running setuid */
443 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
445 pingaddr.sin_family = AF_INET;
446 h = xgethostbyname(host);
447 if (h->h_addrtype != AF_INET)
448 error_msg_and_die("unknown address type; only AF_INET is currently supported.");
450 pingaddr.sin_family = AF_INET; /* h->h_addrtype */
451 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
452 strncpy(buf, h->h_name, sizeof(buf) - 1);
455 /* enable broadcast pings */
457 setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
460 /* set recv buf for broadcast pings */
462 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
465 printf("PING %s (%s): %d data bytes\n",
467 inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
470 signal(SIGINT, pingstats);
472 /* start the ping's going ... */
475 /* listen for replies */
477 struct sockaddr_in from;
478 socklen_t fromlen = (socklen_t) sizeof(from);
481 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
482 (struct sockaddr *) &from, &fromlen)) < 0) {
485 perror_msg("recvfrom");
488 unpack(packet, c, &from);
489 if (pingcount > 0 && nreceived >= pingcount)
495 extern int ping_main(int argc, char **argv)
499 datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
504 /* Parse any options */
505 while (argc >= 1 && **argv == '-') {
516 pingcount = atoi(*argv);
522 datalen = atoi(*argv);
533 myid = getpid() & 0xFFFF;
537 #endif /* ! BB_FEATURE_FANCY_PING */
540 * Copyright (c) 1989 The Regents of the University of California.
541 * All rights reserved.
543 * This code is derived from software contributed to Berkeley by
546 * Redistribution and use in source and binary forms, with or without
547 * modification, are permitted provided that the following conditions
549 * 1. Redistributions of source code must retain the above copyright
550 * notice, this list of conditions and the following disclaimer.
551 * 2. Redistributions in binary form must reproduce the above copyright
552 * notice, this list of conditions and the following disclaimer in the
553 * documentation and/or other materials provided with the distribution.
555 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
556 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
558 * 4. Neither the name of the University nor the names of its contributors
559 * may be used to endorse or promote products derived from this software
560 * without specific prior written permission.
562 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
563 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
564 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
565 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
566 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
567 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
568 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
569 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
570 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
571 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF