2 * $Id: ping.c,v 1.5 1999/12/09 06:11:36 andersen Exp $
3 * Mini ping implementation for busybox
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * This version of ping is adapted from the ping in netkit-base 0.10,
24 * Copyright (c) 1989 The Regents of the University of California.
25 * All rights reserved.
27 * This code is derived from software contributed to Berkeley by
30 * 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>
53 #define MAXPACKET 65468
54 #define MAX_DUP_CHK (8 * 128)
56 #define PINGINTERVAL 1 /* second */
58 #define O_QUIET (1 << 0)
60 #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
61 #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
62 #define SET(bit) (A(bit) |= B(bit))
63 #define CLR(bit) (A(bit) &= (~B(bit)))
64 #define TST(bit) (A(bit) & B(bit))
66 static const char* ping_usage = "ping [OPTION]... host\n\n"
67 "Send ICMP ECHO_REQUEST packets to network hosts.\n\n"
69 "\t-q\t\tQuiet mode, only displays output at start and when finished.\n"
70 "\t-c COUNT\tSend only COUNT pings.\n";
72 static char *hostname = NULL;
73 static struct sockaddr_in pingaddr;
74 static int pingsock = -1;
75 static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0;
76 static int myid = 0, options = 0;
77 static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0;
78 static char rcvd_tbl[MAX_DUP_CHK / 8];
80 static void pingstats(int);
81 static void sendping(int);
82 static void unpack(char *, int, struct sockaddr_in *);
83 static void ping(char *);
84 static int in_cksum(unsigned short *, int);
86 /**************************************************************************/
88 static int in_cksum(unsigned short *buf, int sz)
92 unsigned short *w = buf;
93 unsigned short ans = 0;
101 *(unsigned char *)(&ans) = *(unsigned char *)w;
105 sum = (sum >> 16) + (sum & 0xFFFF);
111 static void pingstats(int ign) {
112 signal(SIGINT, SIG_IGN);
114 printf("\n--- %s ping statistics ---\n", hostname);
115 printf("%ld packets transmitted, ", ntransmitted);
116 printf("%ld packets received, ", nreceived);
118 printf("%ld duplicates, ", nrepeats);
120 printf("%ld%% packet loss\n",
121 (ntransmitted - nreceived)*100/ntransmitted);
123 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
125 (tsum/(nreceived+nrepeats))/10,
126 (tsum/(nreceived+nrepeats))%10,
131 static void sendping(int ign)
135 char packet[DEFDATALEN + 8];
137 pkt = (struct icmp *)packet;
139 pkt->icmp_type = ICMP_ECHO;
142 pkt->icmp_seq = ntransmitted++;
144 CLR(pkt->icmp_seq % MAX_DUP_CHK);
146 gettimeofday((struct timeval *)&packet[8], NULL);
147 pkt->icmp_cksum = in_cksum((unsigned short *)pkt, sizeof(packet));
149 i = sendto(pingsock, packet, sizeof(packet), 0,
150 (struct sockaddr *)&pingaddr, sizeof(struct sockaddr_in));
152 if (i < 0 || i != sizeof(packet)) {
153 if (i < 0) perror("ping");
154 fprintf(stderr, "ping wrote %d chars; %d expected\n", i, sizeof(packet));
158 signal(SIGALRM, sendping);
159 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
161 } else { /* done, wait for the last ping to come back */
162 /* todo, don't necessarily need to wait so long... */
163 signal(SIGALRM, pingstats);
168 static void unpack(char *buf, int sz, struct sockaddr_in *from)
170 struct icmp *icmppkt;
172 struct timeval tv, *tp;
174 unsigned long triptime;
176 gettimeofday(&tv, NULL);
178 /* check IP header */
179 iphdr = (struct iphdr *)buf;
180 hlen = iphdr->ihl << 2;
181 /* discard if too short */
182 if (sz < (DEFDATALEN + ICMP_MINLEN)) return;
185 icmppkt = (struct icmp *)(buf + hlen);
187 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
188 if (icmppkt->icmp_id != myid) return; /* not our ping */
190 tp = (struct timeval *)icmppkt->icmp_data;
192 if ((tv.tv_usec -= tp->tv_usec) < 0) {
194 tv.tv_usec += 1000000;
196 tv.tv_sec -= tp->tv_sec;
198 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
200 if (triptime < tmin) tmin = triptime;
201 if (triptime > tmax) tmax = triptime;
203 if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) {
208 SET(icmppkt->icmp_seq % MAX_DUP_CHK);
212 if (options & O_QUIET) return;
214 printf("%d bytes from %s: icmp_seq=%u", sz,
215 inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
217 printf(" ttl=%d", iphdr->ttl);
218 printf(" time=%lu.%lu ms", triptime/10, triptime%10);
219 if (dupflag) printf(" (DUP!)");
222 fprintf(stderr, "Warning: unknown ICMP packet received (not echo-reply)\n");
226 static void ping(char *host)
228 struct protoent *proto;
230 char buf[MAXHOSTNAMELEN];
231 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
234 if (!(proto = getprotobyname("icmp"))) {
235 fprintf(stderr, "ping: unknown protocol icmp\n");
238 if ((pingsock = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) {
239 if (errno == EPERM) {
240 fprintf(stderr, "ping: permission denied. (are you root?)\n");
247 /* drop root privs if running setuid */
250 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
251 pingaddr.sin_family = AF_INET;
252 if (inet_aton(host, &pingaddr.sin_addr)) {
255 if (!(h = gethostbyname(host))) {
256 fprintf(stderr, "ping: unknown host %s\n", host);
260 if (h->h_addrtype != AF_INET) {
261 fprintf(stderr, "ping: unknown address type; only AF_INET is currently supported.\n");
265 pingaddr.sin_family = AF_INET; /* h->h_addrtype */
266 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
267 strncpy(buf, h->h_name, sizeof(buf)-1);
271 /* enable broadcast pings */
273 setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *)&sockopt, sizeof(sockopt));
275 /* set recv buf for broadcast pings */
277 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *)&sockopt, sizeof(sockopt));
279 printf("PING %s (%s): %d data bytes\n",
280 hostname, inet_ntoa(*(struct in_addr *)&pingaddr.sin_addr.s_addr),
283 signal(SIGINT, pingstats);
285 /* start the ping's going ... */
288 /* listen for replies */
290 struct sockaddr_in from;
291 size_t fromlen = sizeof(from);
294 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
295 (struct sockaddr *)&from, &fromlen)) < 0) {
296 if (errno == EINTR) continue;
300 unpack(packet, c, &from);
301 if (pingcount > 0 && nreceived >= pingcount) break;
306 extern int ping_main(int argc, char **argv)
313 /* Parse any options */
315 if (**argv != '-') usage(ping_usage);
316 thisarg = *argv; thisarg++;
318 case 'q': options |= O_QUIET; break;
321 pingcount = atoi(*argv);
328 if (argc < 1) usage(ping_usage);
330 myid = getpid() & 0xFFFF;
336 * Copyright (c) 1989 The Regents of the University of California.
337 * All rights reserved.
339 * This code is derived from software contributed to Berkeley by
342 * Redistribution and use in source and binary forms, with or without
343 * modification, are permitted provided that the following conditions
345 * 1. Redistributions of source code must retain the above copyright
346 * notice, this list of conditions and the following disclaimer.
347 * 2. Redistributions in binary form must reproduce the above copyright
348 * notice, this list of conditions and the following disclaimer in the
349 * documentation and/or other materials provided with the distribution.
350 * 3. All advertising materials mentioning features or use of this software
351 * must display the following acknowledgement:
352 * This product includes software developed by the University of
353 * California, Berkeley and its contributors.
354 * 4. Neither the name of the University nor the names of its contributors
355 * may be used to endorse or promote products derived from this software
356 * without specific prior written permission.
358 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
359 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
360 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
361 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
362 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
363 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
364 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
365 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
366 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
367 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF