1 /* vi: set sw=4 ts=4: */
3 * $Id: ping.c,v 1.16 2000/06/07 20:38:15 proski 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.
35 #include <sys/param.h>
36 #include <sys/socket.h>
39 #include <sys/times.h>
40 #include <sys/signal.h>
42 #include <netinet/in.h>
43 #include <netinet/ip.h>
44 #include <netinet/ip_icmp.h>
45 #include <arpa/inet.h>
54 #define MAXPACKET 65468
55 #define MAX_DUP_CHK (8 * 128)
57 #define PINGINTERVAL 1 /* second */
59 #define O_QUIET (1 << 0)
61 #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
62 #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
63 #define SET(bit) (A(bit) |= B(bit))
64 #define CLR(bit) (A(bit) &= (~B(bit)))
65 #define TST(bit) (A(bit) & B(bit))
67 static void ping(const char *host);
70 static int in_cksum(unsigned short *buf, int sz)
74 unsigned short *w = buf;
75 unsigned short ans = 0;
83 *(unsigned char *) (&ans) = *(unsigned char *) w;
87 sum = (sum >> 16) + (sum & 0xFFFF);
95 static const char *ping_usage = "ping host\n"
96 #ifndef BB_FEATURE_TRIVIAL_HELP
97 "\nSend ICMP ECHO_REQUEST packets to network hosts\n"
101 static char *hostname = NULL;
103 static void noresp(int ign)
105 printf("No response from %s\n", hostname);
109 static void ping(const char *host)
112 struct sockaddr_in pingaddr;
115 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
117 if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) { /* 1 == ICMP */
118 perror("ping: creating a raw socket");
122 /* drop root privs if running setuid */
125 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
127 pingaddr.sin_family = AF_INET;
128 if (!(h = gethostbyname(host))) {
129 fprintf(stderr, "ping: unknown host %s\n", host);
132 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
133 hostname = h->h_name;
135 pkt = (struct icmp *) packet;
136 memset(pkt, 0, sizeof(packet));
137 pkt->icmp_type = ICMP_ECHO;
138 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
140 c = sendto(pingsock, packet, sizeof(packet), 0,
141 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
143 if (c < 0 || c != sizeof(packet)) {
145 perror("ping: sendto");
146 fprintf(stderr, "ping: write incomplete\n");
150 signal(SIGALRM, noresp);
151 alarm(5); /* give the host 5000ms to respond */
152 /* listen for replies */
154 struct sockaddr_in from;
155 size_t fromlen = sizeof(from);
157 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
158 (struct sockaddr *) &from, &fromlen)) < 0) {
161 perror("ping: recvfrom");
164 if (c >= 76) { /* ip + icmp */
165 struct iphdr *iphdr = (struct iphdr *) packet;
167 pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
168 if (pkt->icmp_type == ICMP_ECHOREPLY)
172 printf("%s is alive!\n", hostname);
176 extern int ping_main(int argc, char **argv)
186 #else /* ! BB_SIMPLE_PING */
187 /* full(er) version */
188 static const char *ping_usage = "ping [OPTION]... host\n"
189 #ifndef BB_FEATURE_TRIVIAL_HELP
190 "\nSend ICMP ECHO_REQUEST packets to network hosts.\n\n"
192 "\t-c COUNT\tSend only COUNT pings.\n"
193 "\t-s SIZE\t\tSend SIZE data bytes in packets (default=56).\n"
194 "\t-q\t\tQuiet mode, only displays output at start\n"
195 "\t\t\tand when finished.\n"
199 static char *hostname = NULL;
200 static struct sockaddr_in pingaddr;
201 static int pingsock = -1;
202 static int datalen = DEFDATALEN;
204 static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
205 static int myid = 0, options = 0;
206 static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
207 static char rcvd_tbl[MAX_DUP_CHK / 8];
209 static void sendping(int);
210 static void pingstats(int);
211 static void unpack(char *, int, struct sockaddr_in *);
213 /**************************************************************************/
215 static void pingstats(int ign)
217 signal(SIGINT, SIG_IGN);
219 printf("\n--- %s ping statistics ---\n", hostname);
220 printf("%ld packets transmitted, ", ntransmitted);
221 printf("%ld packets received, ", nreceived);
223 printf("%ld duplicates, ", nrepeats);
225 printf("%ld%% packet loss\n",
226 (ntransmitted - nreceived) * 100 / ntransmitted);
228 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
229 tmin / 10, tmin % 10,
230 (tsum / (nreceived + nrepeats)) / 10,
231 (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
235 static void sendping(int ign)
239 char packet[datalen + 8];
241 pkt = (struct icmp *) packet;
243 pkt->icmp_type = ICMP_ECHO;
246 pkt->icmp_seq = ntransmitted++;
248 CLR(pkt->icmp_seq % MAX_DUP_CHK);
250 gettimeofday((struct timeval *) &packet[8], NULL);
251 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
253 i = sendto(pingsock, packet, sizeof(packet), 0,
254 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
257 fatalError("ping: sendto: %s\n", strerror(errno));
258 else if (i != sizeof(packet))
259 fatalError("ping wrote %d chars; %d expected\n", i,
260 (int)sizeof(packet));
262 signal(SIGALRM, sendping);
263 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
265 } else { /* done, wait for the last ping to come back */
266 /* todo, don't necessarily need to wait so long... */
267 signal(SIGALRM, pingstats);
272 static char *icmp_type_name (int id)
275 case ICMP_ECHOREPLY: return "Echo Reply";
276 case ICMP_DEST_UNREACH: return "Destination Unreachable";
277 case ICMP_SOURCE_QUENCH: return "Source Quench";
278 case ICMP_REDIRECT: return "Redirect (change route)";
279 case ICMP_ECHO: return "Echo Request";
280 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
281 case ICMP_PARAMETERPROB: return "Parameter Problem";
282 case ICMP_TIMESTAMP: return "Timestamp Request";
283 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
284 case ICMP_INFO_REQUEST: return "Information Request";
285 case ICMP_INFO_REPLY: return "Information Reply";
286 case ICMP_ADDRESS: return "Address Mask Request";
287 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
288 default: return "unknown ICMP type";
292 static void unpack(char *buf, int sz, struct sockaddr_in *from)
294 struct icmp *icmppkt;
296 struct timeval tv, *tp;
298 unsigned long triptime;
300 gettimeofday(&tv, NULL);
302 /* check IP header */
303 iphdr = (struct iphdr *) buf;
304 hlen = iphdr->ihl << 2;
305 /* discard if too short */
306 if (sz < (datalen + ICMP_MINLEN))
310 icmppkt = (struct icmp *) (buf + hlen);
312 if (icmppkt->icmp_id != myid)
313 return; /* not our ping */
315 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
317 tp = (struct timeval *) icmppkt->icmp_data;
319 if ((tv.tv_usec -= tp->tv_usec) < 0) {
321 tv.tv_usec += 1000000;
323 tv.tv_sec -= tp->tv_sec;
325 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
332 if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
337 SET(icmppkt->icmp_seq % MAX_DUP_CHK);
341 if (options & O_QUIET)
344 printf("%d bytes from %s: icmp_seq=%u", sz,
345 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
347 printf(" ttl=%d", iphdr->ttl);
348 printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
353 if (icmppkt->icmp_type != ICMP_ECHO)
355 "Warning: Got ICMP %d (%s)\n",
356 icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type));
359 static void ping(const char *host)
361 struct protoent *proto;
363 char buf[MAXHOSTNAMELEN];
364 char packet[datalen + MAXIPLEN + MAXICMPLEN];
367 proto = getprotobyname("icmp");
368 /* if getprotobyname failed, just silently force
369 * proto->p_proto to have the correct value for "icmp" */
370 if ((pingsock = socket(AF_INET, SOCK_RAW,
371 (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */
372 if (errno == EPERM) {
373 fprintf(stderr, "ping: permission denied. (are you root?)\n");
375 perror("ping: creating a raw socket");
380 /* drop root privs if running setuid */
383 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
385 pingaddr.sin_family = AF_INET;
386 if (!(h = gethostbyname(host))) {
387 fprintf(stderr, "ping: unknown host %s\n", host);
391 if (h->h_addrtype != AF_INET) {
393 "ping: unknown address type; only AF_INET is currently supported.\n");
397 pingaddr.sin_family = AF_INET; /* h->h_addrtype */
398 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
399 strncpy(buf, h->h_name, sizeof(buf) - 1);
402 /* enable broadcast pings */
404 setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
407 /* set recv buf for broadcast pings */
409 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
412 printf("PING %s (%s): %d data bytes\n",
414 inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr),
417 signal(SIGINT, pingstats);
419 /* start the ping's going ... */
422 /* listen for replies */
424 struct sockaddr_in from;
425 socklen_t fromlen = (socklen_t) sizeof(from);
428 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
429 (struct sockaddr *) &from, &fromlen)) < 0) {
432 perror("ping: recvfrom");
435 unpack(packet, c, &from);
436 if (pingcount > 0 && nreceived >= pingcount)
442 extern int ping_main(int argc, char **argv)
449 /* Parse any options */
450 while (argc >= 1 && **argv == '-') {
461 pingcount = atoi(*argv);
467 datalen = atoi(*argv);
478 myid = getpid() & 0xFFFF;
482 #endif /* ! BB_SIMPLE_PING */
485 * Copyright (c) 1989 The Regents of the University of California.
486 * All rights reserved.
488 * This code is derived from software contributed to Berkeley by
491 * Redistribution and use in source and binary forms, with or without
492 * modification, are permitted provided that the following conditions
494 * 1. Redistributions of source code must retain the above copyright
495 * notice, this list of conditions and the following disclaimer.
496 * 2. Redistributions in binary form must reproduce the above copyright
497 * notice, this list of conditions and the following disclaimer in the
498 * documentation and/or other materials provided with the distribution.
499 * 3. All advertising materials mentioning features or use of this software
500 * must display the following acknowledgement:
501 * This product includes software developed by the University of
502 * California, Berkeley and its contributors.
503 * 4. Neither the name of the University nor the names of its contributors
504 * may be used to endorse or promote products derived from this software
505 * without specific prior written permission.
507 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
508 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
509 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
510 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
511 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
512 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
513 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
514 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
515 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
516 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF