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-rw-r--r--networking/ping.c440
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1/* vi: set sw=4 ts=4: */
2/*
3 * $Id: ping.c,v 1.56 2004/03/15 08:28:48 andersen Exp $
4 * Mini ping implementation for busybox
5 *
6 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
7 *
8 * Adapted from the ping in netkit-base 0.10:
9 * Copyright (c) 1989 The Regents of the University of California.
10 * Derived from software contributed to Berkeley by Mike Muuss.
11 *
12 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 */
14
15#include <sys/param.h>
16#include <sys/socket.h>
17#include <sys/file.h>
18#include <sys/times.h>
19#include <signal.h>
20
21#include <netinet/in.h>
22#include <netinet/ip.h>
23#include <netinet/ip_icmp.h>
24#include <arpa/inet.h>
25#include <netdb.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <errno.h>
29#include <unistd.h>
30#include <string.h>
31#include <stdlib.h>
32#include "busybox.h"
33
34enum {
35 DEFDATALEN = 56,
36 MAXIPLEN = 60,
37 MAXICMPLEN = 76,
38 MAXPACKET = 65468,
39 MAX_DUP_CHK = (8 * 128),
40 MAXWAIT = 10,
41 PINGINTERVAL = 1 /* second */
42};
43
44static void ping(const char *host);
45
46/* common routines */
47
48static int in_cksum(unsigned short *buf, int sz)
49{
50 int nleft = sz;
51 int sum = 0;
52 unsigned short *w = buf;
53 unsigned short ans = 0;
54
55 while (nleft > 1) {
56 sum += *w++;
57 nleft -= 2;
58 }
59
60 if (nleft == 1) {
61 *(unsigned char *) (&ans) = *(unsigned char *) w;
62 sum += ans;
63 }
64
65 sum = (sum >> 16) + (sum & 0xFFFF);
66 sum += (sum >> 16);
67 ans = ~sum;
68 return ans;
69}
70
71#ifndef CONFIG_FEATURE_FANCY_PING
72
73/* simple version */
74
75static char *hostname;
76
77static void noresp(int ign)
78{
79 printf("No response from %s\n", hostname);
80 exit(EXIT_FAILURE);
81}
82
83static void ping(const char *host)
84{
85 struct hostent *h;
86 struct sockaddr_in pingaddr;
87 struct icmp *pkt;
88 int pingsock, c;
89 char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
90
91 pingsock = create_icmp_socket();
92
93 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
94
95 pingaddr.sin_family = AF_INET;
96 h = xgethostbyname(host);
97 memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
98 hostname = h->h_name;
99
100 pkt = (struct icmp *) packet;
101 memset(pkt, 0, sizeof(packet));
102 pkt->icmp_type = ICMP_ECHO;
103 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
104
105 c = sendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, 0,
106 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
107
108 if (c < 0) {
109 if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
110 bb_perror_msg_and_die("sendto");
111 }
112
113 signal(SIGALRM, noresp);
114 alarm(5); /* give the host 5000ms to respond */
115 /* listen for replies */
116 while (1) {
117 struct sockaddr_in from;
118 socklen_t fromlen = sizeof(from);
119
120 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
121 (struct sockaddr *) &from, &fromlen)) < 0) {
122 if (errno == EINTR)
123 continue;
124 bb_perror_msg("recvfrom");
125 continue;
126 }
127 if (c >= 76) { /* ip + icmp */
128 struct iphdr *iphdr = (struct iphdr *) packet;
129
130 pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
131 if (pkt->icmp_type == ICMP_ECHOREPLY)
132 break;
133 }
134 }
135 if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
136 printf("%s is alive!\n", hostname);
137 return;
138}
139
140int ping_main(int argc, char **argv)
141{
142 argc--;
143 argv++;
144 if (argc < 1)
145 bb_show_usage();
146 ping(*argv);
147 return EXIT_SUCCESS;
148}
149
150#else /* ! CONFIG_FEATURE_FANCY_PING */
151
152/* full(er) version */
153
154#define OPT_STRING "qc:s:I:"
155enum {
156 OPT_QUIET = 1 << 0,
157};
158
159static struct sockaddr_in pingaddr;
160static struct sockaddr_in sourceaddr;
161static int pingsock = -1;
162static unsigned datalen; /* intentionally uninitialized to work around gcc bug */
163
164static unsigned long ntransmitted, nreceived, nrepeats, pingcount;
165static int myid;
166static unsigned long tmin = ULONG_MAX, tmax, tsum;
167static char rcvd_tbl[MAX_DUP_CHK / 8];
168
169static struct hostent *hostent;
170
171static void sendping(int);
172static void pingstats(int);
173static void unpack(char *, int, struct sockaddr_in *);
174
175#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
176#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
177#define SET(bit) (A(bit) |= B(bit))
178#define CLR(bit) (A(bit) &= (~B(bit)))
179#define TST(bit) (A(bit) & B(bit))
180
181/**************************************************************************/
182
183static void pingstats(int junk)
184{
185 int status;
186
187 signal(SIGINT, SIG_IGN);
188
189 printf("\n--- %s ping statistics ---\n", hostent->h_name);
190 printf("%lu packets transmitted, ", ntransmitted);
191 printf("%lu packets received, ", nreceived);
192 if (nrepeats)
193 printf("%lu duplicates, ", nrepeats);
194 if (ntransmitted)
195 printf("%lu%% packet loss\n",
196 (ntransmitted - nreceived) * 100 / ntransmitted);
197 if (nreceived)
198 printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
199 tmin / 10, tmin % 10,
200 (tsum / (nreceived + nrepeats)) / 10,
201 (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
202 if (nreceived != 0)
203 status = EXIT_SUCCESS;
204 else
205 status = EXIT_FAILURE;
206 exit(status);
207}
208
209static void sendping(int junk)
210{
211 struct icmp *pkt;
212 int i;
213 char packet[datalen + ICMP_MINLEN];
214
215 pkt = (struct icmp *) packet;
216
217 pkt->icmp_type = ICMP_ECHO;
218 pkt->icmp_code = 0;
219 pkt->icmp_cksum = 0;
220 pkt->icmp_seq = htons(ntransmitted++);
221 pkt->icmp_id = myid;
222 CLR(ntohs(pkt->icmp_seq) % MAX_DUP_CHK);
223
224 gettimeofday((struct timeval *) &pkt->icmp_dun, NULL);
225 pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
226
227 i = sendto(pingsock, packet, sizeof(packet), 0,
228 (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
229
230 if (i < 0)
231 bb_perror_msg_and_die("sendto");
232 else if ((size_t)i != sizeof(packet))
233 bb_error_msg_and_die("ping wrote %d chars; %d expected", i,
234 (int)sizeof(packet));
235
236 signal(SIGALRM, sendping);
237 if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
238 alarm(PINGINTERVAL);
239 } else { /* done, wait for the last ping to come back */
240 /* todo, don't necessarily need to wait so long... */
241 signal(SIGALRM, pingstats);
242 alarm(MAXWAIT);
243 }
244}
245
246static char *icmp_type_name(int id)
247{
248 switch (id) {
249 case ICMP_ECHOREPLY: return "Echo Reply";
250 case ICMP_DEST_UNREACH: return "Destination Unreachable";
251 case ICMP_SOURCE_QUENCH: return "Source Quench";
252 case ICMP_REDIRECT: return "Redirect (change route)";
253 case ICMP_ECHO: return "Echo Request";
254 case ICMP_TIME_EXCEEDED: return "Time Exceeded";
255 case ICMP_PARAMETERPROB: return "Parameter Problem";
256 case ICMP_TIMESTAMP: return "Timestamp Request";
257 case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
258 case ICMP_INFO_REQUEST: return "Information Request";
259 case ICMP_INFO_REPLY: return "Information Reply";
260 case ICMP_ADDRESS: return "Address Mask Request";
261 case ICMP_ADDRESSREPLY: return "Address Mask Reply";
262 default: return "unknown ICMP type";
263 }
264}
265
266static void unpack(char *buf, int sz, struct sockaddr_in *from)
267{
268 struct icmp *icmppkt;
269 struct iphdr *iphdr;
270 struct timeval tv, *tp;
271 int hlen, dupflag;
272 unsigned long triptime;
273
274 gettimeofday(&tv, NULL);
275
276 /* discard if too short */
277 if (sz < (datalen + ICMP_MINLEN))
278 return;
279
280 /* check IP header */
281 iphdr = (struct iphdr *) buf;
282 hlen = iphdr->ihl << 2;
283 sz -= hlen;
284 icmppkt = (struct icmp *) (buf + hlen);
285 if (icmppkt->icmp_id != myid)
286 return; /* not our ping */
287
288 if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
289 u_int16_t recv_seq = ntohs(icmppkt->icmp_seq);
290 ++nreceived;
291 tp = (struct timeval *) icmppkt->icmp_data;
292
293 if ((tv.tv_usec -= tp->tv_usec) < 0) {
294 --tv.tv_sec;
295 tv.tv_usec += 1000000;
296 }
297 tv.tv_sec -= tp->tv_sec;
298
299 triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
300 tsum += triptime;
301 if (triptime < tmin)
302 tmin = triptime;
303 if (triptime > tmax)
304 tmax = triptime;
305
306 if (TST(recv_seq % MAX_DUP_CHK)) {
307 ++nrepeats;
308 --nreceived;
309 dupflag = 1;
310 } else {
311 SET(recv_seq % MAX_DUP_CHK);
312 dupflag = 0;
313 }
314
315 if (option_mask32 & OPT_QUIET)
316 return;
317
318 printf("%d bytes from %s: icmp_seq=%u", sz,
319 inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
320 recv_seq);
321 printf(" ttl=%d", iphdr->ttl);
322 printf(" time=%lu.%lu ms", triptime / 10, triptime % 10);
323 if (dupflag)
324 printf(" (DUP!)");
325 puts("");
326 } else
327 if (icmppkt->icmp_type != ICMP_ECHO)
328 bb_error_msg("warning: got ICMP %d (%s)",
329 icmppkt->icmp_type, icmp_type_name(icmppkt->icmp_type));
330 fflush(stdout);
331}
332
333static void ping(const char *host)
334{
335 char packet[datalen + MAXIPLEN + MAXICMPLEN];
336 int sockopt;
337
338 pingsock = create_icmp_socket();
339
340 if (sourceaddr.sin_addr.s_addr) {
341 xbind(pingsock, (struct sockaddr*)&sourceaddr, sizeof(sourceaddr));
342 }
343
344 memset(&pingaddr, 0, sizeof(struct sockaddr_in));
345
346 pingaddr.sin_family = AF_INET;
347 hostent = xgethostbyname(host);
348 if (hostent->h_addrtype != AF_INET)
349 bb_error_msg_and_die("unknown address type; only AF_INET is currently supported");
350
351 memcpy(&pingaddr.sin_addr, hostent->h_addr, sizeof(pingaddr.sin_addr));
352
353 /* enable broadcast pings */
354 setsockopt_broadcast(pingsock);
355
356 /* set recv buf for broadcast pings */
357 sockopt = 48 * 1024;
358 setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
359 sizeof(sockopt));
360
361 printf("PING %s (%s)",
362 hostent->h_name,
363 inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr));
364 if (sourceaddr.sin_addr.s_addr) {
365 printf(" from %s",
366 inet_ntoa(*(struct in_addr *) &sourceaddr.sin_addr.s_addr));
367 }
368 printf(": %d data bytes\n", datalen);
369
370 signal(SIGINT, pingstats);
371
372 /* start the ping's going ... */
373 sendping(0);
374
375 /* listen for replies */
376 while (1) {
377 struct sockaddr_in from;
378 socklen_t fromlen = (socklen_t) sizeof(from);
379 int c;
380
381 if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
382 (struct sockaddr *) &from, &fromlen)) < 0) {
383 if (errno == EINTR)
384 continue;
385 bb_perror_msg("recvfrom");
386 continue;
387 }
388 unpack(packet, c, &from);
389 if (pingcount > 0 && nreceived >= pingcount)
390 break;
391 }
392 pingstats(0);
393}
394
395/* TODO: consolidate ether-wake.c, dnsd.c, ifupdown.c, nslookup.c
396 * versions of below thing. BTW we have far too many "%u.%u.%u.%u" too...
397*/
398static int parse_nipquad(const char *str, struct sockaddr_in* addr)
399{
400 char dummy;
401 unsigned i1, i2, i3, i4;
402 if (sscanf(str, "%u.%u.%u.%u%c",
403 &i1, &i2, &i3, &i4, &dummy) == 4
404 && ( (i1|i2|i3|i4) <= 0xff )
405 ) {
406 uint8_t* ptr = (uint8_t*)&addr->sin_addr;
407 ptr[0] = i1;
408 ptr[1] = i2;
409 ptr[2] = i3;
410 ptr[3] = i4;
411 return 0;
412 }
413 return 1; /* error */
414}
415
416int ping_main(int argc, char **argv)
417{
418 char *opt_c, *opt_s, *opt_I;
419
420 datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
421
422 /* exactly one argument needed */
423 opt_complementary = "=1";
424 getopt32(argc, argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
425 if (option_mask32 & 2) pingcount = xatoul(opt_c); // -c
426 if (option_mask32 & 4) datalen = xatou16(opt_s); // -s
427 if (option_mask32 & 8) { // -I
428/* TODO: ping6 accepts iface too:
429 if_index = if_nametoindex(*argv);
430 if (!if_index) ...
431make it true for ping. */
432 if (parse_nipquad(opt_I, &sourceaddr))
433 bb_show_usage();
434 }
435
436 myid = (int16_t) getpid();
437 ping(argv[optind]);
438 return EXIT_SUCCESS;
439}
440#endif /* ! CONFIG_FEATURE_FANCY_PING */