1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Mike Muuss.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #if 0
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1989, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
38 #endif /* not lint */
39
40 #ifndef lint
41 static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93";
42 #endif /* not lint */
43 #endif
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: stable/10/sbin/ping/ping.c 241852 2012-10-22 03:31:22Z eadler $");
46
47 /*
48 * P I N G . C
49 *
50 * Using the Internet Control Message Protocol (ICMP) "ECHO" facility,
51 * measure round-trip-delays and packet loss across network paths.
52 *
53 * Author -
54 * Mike Muuss
55 * U. S. Army Ballistic Research Laboratory
56 * December, 1983
57 *
58 * Status -
59 * Public Domain. Distribution Unlimited.
60 * Bugs -
61 * More statistics could always be gathered.
62 * This program has to run SUID to ROOT to access the ICMP socket.
63 */
64
65 #include <sys/param.h> /* NB: we rely on this for <sys/types.h> */
66 #include <sys/socket.h>
67 #include <sys/sysctl.h>
68 #include <sys/time.h>
69 #include <sys/uio.h>
70
71 #include <netinet/in.h>
72 #include <netinet/in_systm.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_icmp.h>
75 #include <netinet/ip_var.h>
76 #include <arpa/inet.h>
77
78 #ifdef IPSEC
79 #include <netipsec/ipsec.h>
80 #endif /*IPSEC*/
81
82 #include <ctype.h>
83 #include <err.h>
84 #include <errno.h>
85 #include <math.h>
86 #include <netdb.h>
87 #include <signal.h>
88 #include <stdio.h>
89 #include <stdlib.h>
90 #include <string.h>
91 #include <sysexits.h>
92 #include <unistd.h>
93
94 #define INADDR_LEN ((int)sizeof(in_addr_t))
95 #define TIMEVAL_LEN ((int)sizeof(struct tv32))
96 #define MASK_LEN (ICMP_MASKLEN - ICMP_MINLEN)
97 #define TS_LEN (ICMP_TSLEN - ICMP_MINLEN)
98 #define DEFDATALEN 56 /* default data length */
99 #define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */
100 /* runs out of buffer space */
101 #define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN)
102 #define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN)
103 #define MAXWAIT 10000 /* max ms to wait for response */
104 #define MAXALARM (60 * 60) /* max seconds for alarm timeout */
105 #define MAXTOS 255
106
107 #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
108 #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
109 #define SET(bit) (A(bit) |= B(bit))
110 #define CLR(bit) (A(bit) &= (~B(bit)))
111 #define TST(bit) (A(bit) & B(bit))
112
113 struct tv32 {
114 int32_t tv32_sec;
115 int32_t tv32_usec;
116 };
117
118 /* various options */
119 int options;
120 #define F_FLOOD 0x0001
121 #define F_INTERVAL 0x0002
122 #define F_NUMERIC 0x0004
123 #define F_PINGFILLED 0x0008
124 #define F_QUIET 0x0010
125 #define F_RROUTE 0x0020
126 #define F_SO_DEBUG 0x0040
127 #define F_SO_DONTROUTE 0x0080
128 #define F_VERBOSE 0x0100
129 #define F_QUIET2 0x0200
130 #define F_NOLOOP 0x0400
131 #define F_MTTL 0x0800
132 #define F_MIF 0x1000
133 #define F_AUDIBLE 0x2000
134 #ifdef IPSEC
135 #ifdef IPSEC_POLICY_IPSEC
136 #define F_POLICY 0x4000
137 #endif /*IPSEC_POLICY_IPSEC*/
138 #endif /*IPSEC*/
139 #define F_TTL 0x8000
140 #define F_MISSED 0x10000
141 #define F_ONCE 0x20000
142 #define F_HDRINCL 0x40000
143 #define F_MASK 0x80000
144 #define F_TIME 0x100000
145 #define F_SWEEP 0x200000
146 #define F_WAITTIME 0x400000
147
148 /*
149 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
150 * number of received sequence numbers we can keep track of. Change 128
151 * to 8192 for complete accuracy...
152 */
153 #define MAX_DUP_CHK (8 * 128)
154 int mx_dup_ck = MAX_DUP_CHK;
155 char rcvd_tbl[MAX_DUP_CHK / 8];
156
157 struct sockaddr_in whereto; /* who to ping */
158 int datalen = DEFDATALEN;
159 int maxpayload;
160 int s; /* socket file descriptor */
161 u_char outpackhdr[IP_MAXPACKET], *outpack;
162 char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */
163 char BSPACE = '\b'; /* characters written for flood */
164 char DOT = '.';
165 char *hostname;
166 char *shostname;
167 int ident; /* process id to identify our packets */
168 int uid; /* cached uid for micro-optimization */
169 u_char icmp_type = ICMP_ECHO;
170 u_char icmp_type_rsp = ICMP_ECHOREPLY;
171 int phdr_len = 0;
172 int send_len;
173
174 /* counters */
175 long nmissedmax; /* max value of ntransmitted - nreceived - 1 */
176 long npackets; /* max packets to transmit */
177 long nreceived; /* # of packets we got back */
178 long nrepeats; /* number of duplicates */
179 long ntransmitted; /* sequence # for outbound packets = #sent */
180 long snpackets; /* max packets to transmit in one sweep */
181 long snreceived; /* # of packets we got back in this sweep */
182 long sntransmitted; /* # of packets we sent in this sweep */
183 int sweepmax; /* max value of payload in sweep */
184 int sweepmin = 0; /* start value of payload in sweep */
185 int sweepincr = 1; /* payload increment in sweep */
186 int interval = 1000; /* interval between packets, ms */
187 int waittime = MAXWAIT; /* timeout for each packet */
188 long nrcvtimeout = 0; /* # of packets we got back after waittime */
189
190 /* timing */
191 int timing; /* flag to do timing */
192 double tmin = 999999999.0; /* minimum round trip time */
193 double tmax = 0.0; /* maximum round trip time */
194 double tsum = 0.0; /* sum of all times, for doing average */
195 double tsumsq = 0.0; /* sum of all times squared, for std. dev. */
196
197 volatile sig_atomic_t finish_up; /* nonzero if we've been told to finish up */
198 volatile sig_atomic_t siginfo_p;
199
200 static void fill(char *, char *);
201 static u_short in_cksum(u_short *, int);
202 static void check_status(void);
203 static void finish(void) __dead2;
204 static void pinger(void);
205 static char *pr_addr(struct in_addr);
206 static char *pr_ntime(n_time);
207 static void pr_icmph(struct icmp *);
208 static void pr_iph(struct ip *);
209 static void pr_pack(char *, int, struct sockaddr_in *, struct timeval *);
210 static void pr_retip(struct ip *);
211 static void status(int);
212 static void stopit(int);
213 static void tvsub(struct timeval *, const struct timeval *);
214 static void usage(void) __dead2;
215
216 int
main(int argc,char * const * argv)217 main(int argc, char *const *argv)
218 {
219 struct sockaddr_in from, sock_in;
220 struct in_addr ifaddr;
221 struct timeval last, intvl;
222 struct iovec iov;
223 struct ip *ip;
224 struct msghdr msg;
225 struct sigaction si_sa;
226 size_t sz;
227 u_char *datap, packet[IP_MAXPACKET] __aligned(4);
228 char *ep, *source, *target, *payload;
229 struct hostent *hp;
230 #ifdef IPSEC_POLICY_IPSEC
231 char *policy_in, *policy_out;
232 #endif
233 struct sockaddr_in *to;
234 double t;
235 u_long alarmtimeout, ultmp;
236 int almost_done, ch, df, hold, i, icmp_len, mib[4], preload, sockerrno,
237 tos, ttl;
238 char ctrl[CMSG_SPACE(sizeof(struct timeval))];
239 char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN];
240 #ifdef IP_OPTIONS
241 char rspace[MAX_IPOPTLEN]; /* record route space */
242 #endif
243 unsigned char loop, mttl;
244
245 payload = source = NULL;
246 #ifdef IPSEC_POLICY_IPSEC
247 policy_in = policy_out = NULL;
248 #endif
249
250 /*
251 * Do the stuff that we need root priv's for *first*, and
252 * then drop our setuid bit. Save error reporting for
253 * after arg parsing.
254 */
255 s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
256 sockerrno = errno;
257
258 if (setuid(getuid()) != 0)
259 err(EX_NOPERM, "setuid() failed");
260 uid = getuid();
261
262 alarmtimeout = df = preload = tos = 0;
263
264 outpack = outpackhdr + sizeof(struct ip);
265 while ((ch = getopt(argc, argv,
266 "Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
267 #ifdef IPSEC
268 #ifdef IPSEC_POLICY_IPSEC
269 "P:"
270 #endif /*IPSEC_POLICY_IPSEC*/
271 #endif /*IPSEC*/
272 )) != -1)
273 {
274 switch(ch) {
275 case 'A':
276 options |= F_MISSED;
277 break;
278 case 'a':
279 options |= F_AUDIBLE;
280 break;
281 case 'c':
282 ultmp = strtoul(optarg, &ep, 0);
283 if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp)
284 errx(EX_USAGE,
285 "invalid count of packets to transmit: `%s'",
286 optarg);
287 npackets = ultmp;
288 break;
289 case 'D':
290 options |= F_HDRINCL;
291 df = 1;
292 break;
293 case 'd':
294 options |= F_SO_DEBUG;
295 break;
296 case 'f':
297 if (uid) {
298 errno = EPERM;
299 err(EX_NOPERM, "-f flag");
300 }
301 options |= F_FLOOD;
302 setbuf(stdout, (char *)NULL);
303 break;
304 case 'G': /* Maximum packet size for ping sweep */
305 ultmp = strtoul(optarg, &ep, 0);
306 if (*ep || ep == optarg)
307 errx(EX_USAGE, "invalid packet size: `%s'",
308 optarg);
309 if (uid != 0 && ultmp > DEFDATALEN) {
310 errno = EPERM;
311 err(EX_NOPERM,
312 "packet size too large: %lu > %u",
313 ultmp, DEFDATALEN);
314 }
315 options |= F_SWEEP;
316 sweepmax = ultmp;
317 break;
318 case 'g': /* Minimum packet size for ping sweep */
319 ultmp = strtoul(optarg, &ep, 0);
320 if (*ep || ep == optarg)
321 errx(EX_USAGE, "invalid packet size: `%s'",
322 optarg);
323 if (uid != 0 && ultmp > DEFDATALEN) {
324 errno = EPERM;
325 err(EX_NOPERM,
326 "packet size too large: %lu > %u",
327 ultmp, DEFDATALEN);
328 }
329 options |= F_SWEEP;
330 sweepmin = ultmp;
331 break;
332 case 'h': /* Packet size increment for ping sweep */
333 ultmp = strtoul(optarg, &ep, 0);
334 if (*ep || ep == optarg || ultmp < 1)
335 errx(EX_USAGE, "invalid increment size: `%s'",
336 optarg);
337 if (uid != 0 && ultmp > DEFDATALEN) {
338 errno = EPERM;
339 err(EX_NOPERM,
340 "packet size too large: %lu > %u",
341 ultmp, DEFDATALEN);
342 }
343 options |= F_SWEEP;
344 sweepincr = ultmp;
345 break;
346 case 'I': /* multicast interface */
347 if (inet_aton(optarg, &ifaddr) == 0)
348 errx(EX_USAGE,
349 "invalid multicast interface: `%s'",
350 optarg);
351 options |= F_MIF;
352 break;
353 case 'i': /* wait between sending packets */
354 t = strtod(optarg, &ep) * 1000.0;
355 if (*ep || ep == optarg || t > (double)INT_MAX)
356 errx(EX_USAGE, "invalid timing interval: `%s'",
357 optarg);
358 options |= F_INTERVAL;
359 interval = (int)t;
360 if (uid && interval < 1000) {
361 errno = EPERM;
362 err(EX_NOPERM, "-i interval too short");
363 }
364 break;
365 case 'L':
366 options |= F_NOLOOP;
367 loop = 0;
368 break;
369 case 'l':
370 ultmp = strtoul(optarg, &ep, 0);
371 if (*ep || ep == optarg || ultmp > INT_MAX)
372 errx(EX_USAGE,
373 "invalid preload value: `%s'", optarg);
374 if (uid) {
375 errno = EPERM;
376 err(EX_NOPERM, "-l flag");
377 }
378 preload = ultmp;
379 break;
380 case 'M':
381 switch(optarg[0]) {
382 case 'M':
383 case 'm':
384 options |= F_MASK;
385 break;
386 case 'T':
387 case 't':
388 options |= F_TIME;
389 break;
390 default:
391 errx(EX_USAGE, "invalid message: `%c'", optarg[0]);
392 break;
393 }
394 break;
395 case 'm': /* TTL */
396 ultmp = strtoul(optarg, &ep, 0);
397 if (*ep || ep == optarg || ultmp > MAXTTL)
398 errx(EX_USAGE, "invalid TTL: `%s'", optarg);
399 ttl = ultmp;
400 options |= F_TTL;
401 break;
402 case 'n':
403 options |= F_NUMERIC;
404 break;
405 case 'o':
406 options |= F_ONCE;
407 break;
408 #ifdef IPSEC
409 #ifdef IPSEC_POLICY_IPSEC
410 case 'P':
411 options |= F_POLICY;
412 if (!strncmp("in", optarg, 2))
413 policy_in = strdup(optarg);
414 else if (!strncmp("out", optarg, 3))
415 policy_out = strdup(optarg);
416 else
417 errx(1, "invalid security policy");
418 break;
419 #endif /*IPSEC_POLICY_IPSEC*/
420 #endif /*IPSEC*/
421 case 'p': /* fill buffer with user pattern */
422 options |= F_PINGFILLED;
423 payload = optarg;
424 break;
425 case 'Q':
426 options |= F_QUIET2;
427 break;
428 case 'q':
429 options |= F_QUIET;
430 break;
431 case 'R':
432 options |= F_RROUTE;
433 break;
434 case 'r':
435 options |= F_SO_DONTROUTE;
436 break;
437 case 'S':
438 source = optarg;
439 break;
440 case 's': /* size of packet to send */
441 ultmp = strtoul(optarg, &ep, 0);
442 if (*ep || ep == optarg)
443 errx(EX_USAGE, "invalid packet size: `%s'",
444 optarg);
445 if (uid != 0 && ultmp > DEFDATALEN) {
446 errno = EPERM;
447 err(EX_NOPERM,
448 "packet size too large: %lu > %u",
449 ultmp, DEFDATALEN);
450 }
451 datalen = ultmp;
452 break;
453 case 'T': /* multicast TTL */
454 ultmp = strtoul(optarg, &ep, 0);
455 if (*ep || ep == optarg || ultmp > MAXTTL)
456 errx(EX_USAGE, "invalid multicast TTL: `%s'",
457 optarg);
458 mttl = ultmp;
459 options |= F_MTTL;
460 break;
461 case 't':
462 alarmtimeout = strtoul(optarg, &ep, 0);
463 if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
464 errx(EX_USAGE, "invalid timeout: `%s'",
465 optarg);
466 if (alarmtimeout > MAXALARM)
467 errx(EX_USAGE, "invalid timeout: `%s' > %d",
468 optarg, MAXALARM);
469 alarm((int)alarmtimeout);
470 break;
471 case 'v':
472 options |= F_VERBOSE;
473 break;
474 case 'W': /* wait ms for answer */
475 t = strtod(optarg, &ep);
476 if (*ep || ep == optarg || t > (double)INT_MAX)
477 errx(EX_USAGE, "invalid timing interval: `%s'",
478 optarg);
479 options |= F_WAITTIME;
480 waittime = (int)t;
481 break;
482 case 'z':
483 options |= F_HDRINCL;
484 ultmp = strtoul(optarg, &ep, 0);
485 if (*ep || ep == optarg || ultmp > MAXTOS)
486 errx(EX_USAGE, "invalid TOS: `%s'", optarg);
487 tos = ultmp;
488 break;
489 default:
490 usage();
491 }
492 }
493
494 if (argc - optind != 1)
495 usage();
496 target = argv[optind];
497
498 switch (options & (F_MASK|F_TIME)) {
499 case 0: break;
500 case F_MASK:
501 icmp_type = ICMP_MASKREQ;
502 icmp_type_rsp = ICMP_MASKREPLY;
503 phdr_len = MASK_LEN;
504 if (!(options & F_QUIET))
505 (void)printf("ICMP_MASKREQ\n");
506 break;
507 case F_TIME:
508 icmp_type = ICMP_TSTAMP;
509 icmp_type_rsp = ICMP_TSTAMPREPLY;
510 phdr_len = TS_LEN;
511 if (!(options & F_QUIET))
512 (void)printf("ICMP_TSTAMP\n");
513 break;
514 default:
515 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive.");
516 break;
517 }
518 icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len;
519 if (options & F_RROUTE)
520 icmp_len += MAX_IPOPTLEN;
521 maxpayload = IP_MAXPACKET - icmp_len;
522 if (datalen > maxpayload)
523 errx(EX_USAGE, "packet size too large: %d > %d", datalen,
524 maxpayload);
525 send_len = icmp_len + datalen;
526 datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN];
527 if (options & F_PINGFILLED) {
528 fill((char *)datap, payload);
529 }
530 if (source) {
531 bzero((char *)&sock_in, sizeof(sock_in));
532 sock_in.sin_family = AF_INET;
533 if (inet_aton(source, &sock_in.sin_addr) != 0) {
534 shostname = source;
535 } else {
536 hp = gethostbyname2(source, AF_INET);
537 if (!hp)
538 errx(EX_NOHOST, "cannot resolve %s: %s",
539 source, hstrerror(h_errno));
540
541 sock_in.sin_len = sizeof sock_in;
542 if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) ||
543 hp->h_length < 0)
544 errx(1, "gethostbyname2: illegal address");
545 memcpy(&sock_in.sin_addr, hp->h_addr_list[0],
546 sizeof(sock_in.sin_addr));
547 (void)strncpy(snamebuf, hp->h_name,
548 sizeof(snamebuf) - 1);
549 snamebuf[sizeof(snamebuf) - 1] = '\0';
550 shostname = snamebuf;
551 }
552 if (bind(s, (struct sockaddr *)&sock_in, sizeof sock_in) == -1)
553 err(1, "bind");
554 }
555
556 bzero(&whereto, sizeof(whereto));
557 to = &whereto;
558 to->sin_family = AF_INET;
559 to->sin_len = sizeof *to;
560 if (inet_aton(target, &to->sin_addr) != 0) {
561 hostname = target;
562 } else {
563 hp = gethostbyname2(target, AF_INET);
564 if (!hp)
565 errx(EX_NOHOST, "cannot resolve %s: %s",
566 target, hstrerror(h_errno));
567
568 if ((unsigned)hp->h_length > sizeof(to->sin_addr))
569 errx(1, "gethostbyname2 returned an illegal address");
570 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
571 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
572 hnamebuf[sizeof(hnamebuf) - 1] = '\0';
573 hostname = hnamebuf;
574 }
575
576 if (options & F_FLOOD && options & F_INTERVAL)
577 errx(EX_USAGE, "-f and -i: incompatible options");
578
579 if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
580 errx(EX_USAGE,
581 "-f flag cannot be used with multicast destination");
582 if (options & (F_MIF | F_NOLOOP | F_MTTL)
583 && !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
584 errx(EX_USAGE,
585 "-I, -L, -T flags cannot be used with unicast destination");
586
587 if (datalen >= TIMEVAL_LEN) /* can we time transfer */
588 timing = 1;
589
590 if (!(options & F_PINGFILLED))
591 for (i = TIMEVAL_LEN; i < datalen; ++i)
592 *datap++ = i;
593
594 ident = getpid() & 0xFFFF;
595
596 if (s < 0) {
597 errno = sockerrno;
598 err(EX_OSERR, "socket");
599 }
600 hold = 1;
601 if (options & F_SO_DEBUG)
602 (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&hold,
603 sizeof(hold));
604 if (options & F_SO_DONTROUTE)
605 (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
606 sizeof(hold));
607 #ifdef IPSEC
608 #ifdef IPSEC_POLICY_IPSEC
609 if (options & F_POLICY) {
610 char *buf;
611 if (policy_in != NULL) {
612 buf = ipsec_set_policy(policy_in, strlen(policy_in));
613 if (buf == NULL)
614 errx(EX_CONFIG, "%s", ipsec_strerror());
615 if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY,
616 buf, ipsec_get_policylen(buf)) < 0)
617 err(EX_CONFIG,
618 "ipsec policy cannot be configured");
619 free(buf);
620 }
621
622 if (policy_out != NULL) {
623 buf = ipsec_set_policy(policy_out, strlen(policy_out));
624 if (buf == NULL)
625 errx(EX_CONFIG, "%s", ipsec_strerror());
626 if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY,
627 buf, ipsec_get_policylen(buf)) < 0)
628 err(EX_CONFIG,
629 "ipsec policy cannot be configured");
630 free(buf);
631 }
632 }
633 #endif /*IPSEC_POLICY_IPSEC*/
634 #endif /*IPSEC*/
635
636 if (options & F_HDRINCL) {
637 ip = (struct ip*)outpackhdr;
638 if (!(options & (F_TTL | F_MTTL))) {
639 mib[0] = CTL_NET;
640 mib[1] = PF_INET;
641 mib[2] = IPPROTO_IP;
642 mib[3] = IPCTL_DEFTTL;
643 sz = sizeof(ttl);
644 if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1)
645 err(1, "sysctl(net.inet.ip.ttl)");
646 }
647 setsockopt(s, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
648 ip->ip_v = IPVERSION;
649 ip->ip_hl = sizeof(struct ip) >> 2;
650 ip->ip_tos = tos;
651 ip->ip_id = 0;
652 ip->ip_off = df ? IP_DF : 0;
653 ip->ip_ttl = ttl;
654 ip->ip_p = IPPROTO_ICMP;
655 ip->ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY;
656 ip->ip_dst = to->sin_addr;
657 }
658 /* record route option */
659 if (options & F_RROUTE) {
660 #ifdef IP_OPTIONS
661 bzero(rspace, sizeof(rspace));
662 rspace[IPOPT_OPTVAL] = IPOPT_RR;
663 rspace[IPOPT_OLEN] = sizeof(rspace) - 1;
664 rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
665 rspace[sizeof(rspace) - 1] = IPOPT_EOL;
666 if (setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace,
667 sizeof(rspace)) < 0)
668 err(EX_OSERR, "setsockopt IP_OPTIONS");
669 #else
670 errx(EX_UNAVAILABLE,
671 "record route not available in this implementation");
672 #endif /* IP_OPTIONS */
673 }
674
675 if (options & F_TTL) {
676 if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl,
677 sizeof(ttl)) < 0) {
678 err(EX_OSERR, "setsockopt IP_TTL");
679 }
680 }
681 if (options & F_NOLOOP) {
682 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
683 sizeof(loop)) < 0) {
684 err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
685 }
686 }
687 if (options & F_MTTL) {
688 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &mttl,
689 sizeof(mttl)) < 0) {
690 err(EX_OSERR, "setsockopt IP_MULTICAST_TTL");
691 }
692 }
693 if (options & F_MIF) {
694 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
695 sizeof(ifaddr)) < 0) {
696 err(EX_OSERR, "setsockopt IP_MULTICAST_IF");
697 }
698 }
699 #ifdef SO_TIMESTAMP
700 { int on = 1;
701 if (setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0)
702 err(EX_OSERR, "setsockopt SO_TIMESTAMP");
703 }
704 #endif
705 if (sweepmax) {
706 if (sweepmin >= sweepmax)
707 errx(EX_USAGE, "Maximum packet size must be greater than the minimum packet size");
708
709 if (datalen != DEFDATALEN)
710 errx(EX_USAGE, "Packet size and ping sweep are mutually exclusive");
711
712 if (npackets > 0) {
713 snpackets = npackets;
714 npackets = 0;
715 } else
716 snpackets = 1;
717 datalen = sweepmin;
718 send_len = icmp_len + sweepmin;
719 }
720 if (options & F_SWEEP && !sweepmax)
721 errx(EX_USAGE, "Maximum sweep size must be specified");
722
723 /*
724 * When pinging the broadcast address, you can get a lot of answers.
725 * Doing something so evil is useful if you are trying to stress the
726 * ethernet, or just want to fill the arp cache to get some stuff for
727 * /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast
728 * or multicast pings if they wish.
729 */
730
731 /*
732 * XXX receive buffer needs undetermined space for mbuf overhead
733 * as well.
734 */
735 hold = IP_MAXPACKET + 128;
736 (void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
737 sizeof(hold));
738 if (uid == 0)
739 (void)setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
740 sizeof(hold));
741
742 if (to->sin_family == AF_INET) {
743 (void)printf("PING %s (%s)", hostname,
744 inet_ntoa(to->sin_addr));
745 if (source)
746 (void)printf(" from %s", shostname);
747 if (sweepmax)
748 (void)printf(": (%d ... %d) data bytes\n",
749 sweepmin, sweepmax);
750 else
751 (void)printf(": %d data bytes\n", datalen);
752
753 } else {
754 if (sweepmax)
755 (void)printf("PING %s: (%d ... %d) data bytes\n",
756 hostname, sweepmin, sweepmax);
757 else
758 (void)printf("PING %s: %d data bytes\n", hostname, datalen);
759 }
760
761 /*
762 * Use sigaction() instead of signal() to get unambiguous semantics,
763 * in particular with SA_RESTART not set.
764 */
765
766 sigemptyset(&si_sa.sa_mask);
767 si_sa.sa_flags = 0;
768
769 si_sa.sa_handler = stopit;
770 if (sigaction(SIGINT, &si_sa, 0) == -1) {
771 err(EX_OSERR, "sigaction SIGINT");
772 }
773
774 si_sa.sa_handler = status;
775 if (sigaction(SIGINFO, &si_sa, 0) == -1) {
776 err(EX_OSERR, "sigaction");
777 }
778
779 if (alarmtimeout > 0) {
780 si_sa.sa_handler = stopit;
781 if (sigaction(SIGALRM, &si_sa, 0) == -1)
782 err(EX_OSERR, "sigaction SIGALRM");
783 }
784
785 bzero(&msg, sizeof(msg));
786 msg.msg_name = (caddr_t)&from;
787 msg.msg_iov = &iov;
788 msg.msg_iovlen = 1;
789 #ifdef SO_TIMESTAMP
790 msg.msg_control = (caddr_t)ctrl;
791 #endif
792 iov.iov_base = packet;
793 iov.iov_len = IP_MAXPACKET;
794
795 if (preload == 0)
796 pinger(); /* send the first ping */
797 else {
798 if (npackets != 0 && preload > npackets)
799 preload = npackets;
800 while (preload--) /* fire off them quickies */
801 pinger();
802 }
803 (void)gettimeofday(&last, NULL);
804
805 if (options & F_FLOOD) {
806 intvl.tv_sec = 0;
807 intvl.tv_usec = 10000;
808 } else {
809 intvl.tv_sec = interval / 1000;
810 intvl.tv_usec = interval % 1000 * 1000;
811 }
812
813 almost_done = 0;
814 while (!finish_up) {
815 struct timeval now, timeout;
816 fd_set rfds;
817 int cc, n;
818
819 check_status();
820 if ((unsigned)s >= FD_SETSIZE)
821 errx(EX_OSERR, "descriptor too large");
822 FD_ZERO(&rfds);
823 FD_SET(s, &rfds);
824 (void)gettimeofday(&now, NULL);
825 timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec;
826 timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec;
827 while (timeout.tv_usec < 0) {
828 timeout.tv_usec += 1000000;
829 timeout.tv_sec--;
830 }
831 while (timeout.tv_usec >= 1000000) {
832 timeout.tv_usec -= 1000000;
833 timeout.tv_sec++;
834 }
835 if (timeout.tv_sec < 0)
836 timerclear(&timeout);
837 n = select(s + 1, &rfds, NULL, NULL, &timeout);
838 if (n < 0)
839 continue; /* Must be EINTR. */
840 if (n == 1) {
841 struct timeval *tv = NULL;
842 #ifdef SO_TIMESTAMP
843 struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl;
844
845 msg.msg_controllen = sizeof(ctrl);
846 #endif
847 msg.msg_namelen = sizeof(from);
848 if ((cc = recvmsg(s, &msg, 0)) < 0) {
849 if (errno == EINTR)
850 continue;
851 warn("recvmsg");
852 continue;
853 }
854 #ifdef SO_TIMESTAMP
855 if (cmsg->cmsg_level == SOL_SOCKET &&
856 cmsg->cmsg_type == SCM_TIMESTAMP &&
857 cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
858 /* Copy to avoid alignment problems: */
859 memcpy(&now, CMSG_DATA(cmsg), sizeof(now));
860 tv = &now;
861 }
862 #endif
863 if (tv == NULL) {
864 (void)gettimeofday(&now, NULL);
865 tv = &now;
866 }
867 pr_pack((char *)packet, cc, &from, tv);
868 if ((options & F_ONCE && nreceived) ||
869 (npackets && nreceived >= npackets))
870 break;
871 }
872 if (n == 0 || options & F_FLOOD) {
873 if (sweepmax && sntransmitted == snpackets) {
874 for (i = 0; i < sweepincr ; ++i)
875 *datap++ = i;
876 datalen += sweepincr;
877 if (datalen > sweepmax)
878 break;
879 send_len = icmp_len + datalen;
880 sntransmitted = 0;
881 }
882 if (!npackets || ntransmitted < npackets)
883 pinger();
884 else {
885 if (almost_done)
886 break;
887 almost_done = 1;
888 intvl.tv_usec = 0;
889 if (nreceived) {
890 intvl.tv_sec = 2 * tmax / 1000;
891 if (!intvl.tv_sec)
892 intvl.tv_sec = 1;
893 } else {
894 intvl.tv_sec = waittime / 1000;
895 intvl.tv_usec = waittime % 1000 * 1000;
896 }
897 }
898 (void)gettimeofday(&last, NULL);
899 if (ntransmitted - nreceived - 1 > nmissedmax) {
900 nmissedmax = ntransmitted - nreceived - 1;
901 if (options & F_MISSED)
902 (void)write(STDOUT_FILENO, &BBELL, 1);
903 }
904 }
905 }
906 finish();
907 /* NOTREACHED */
908 exit(0); /* Make the compiler happy */
909 }
910
911 /*
912 * stopit --
913 * Set the global bit that causes the main loop to quit.
914 * Do NOT call finish() from here, since finish() does far too much
915 * to be called from a signal handler.
916 */
917 void
stopit(int sig __unused)918 stopit(int sig __unused)
919 {
920
921 /*
922 * When doing reverse DNS lookups, the finish_up flag might not
923 * be noticed for a while. Just exit if we get a second SIGINT.
924 */
925 if (!(options & F_NUMERIC) && finish_up)
926 _exit(nreceived ? 0 : 2);
927 finish_up = 1;
928 }
929
930 /*
931 * pinger --
932 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet
933 * will be added on by the kernel. The ID field is our UNIX process ID,
934 * and the sequence number is an ascending integer. The first TIMEVAL_LEN
935 * bytes of the data portion are used to hold a UNIX "timeval" struct in
936 * host byte-order, to compute the round-trip time.
937 */
938 static void
pinger(void)939 pinger(void)
940 {
941 struct timeval now;
942 struct tv32 tv32;
943 struct ip *ip;
944 struct icmp *icp;
945 int cc, i;
946 u_char *packet;
947
948 packet = outpack;
949 icp = (struct icmp *)outpack;
950 icp->icmp_type = icmp_type;
951 icp->icmp_code = 0;
952 icp->icmp_cksum = 0;
953 icp->icmp_seq = htons(ntransmitted);
954 icp->icmp_id = ident; /* ID */
955
956 CLR(ntransmitted % mx_dup_ck);
957
958 if ((options & F_TIME) || timing) {
959 (void)gettimeofday(&now, NULL);
960
961 tv32.tv32_sec = htonl(now.tv_sec);
962 tv32.tv32_usec = htonl(now.tv_usec);
963 if (options & F_TIME)
964 icp->icmp_otime = htonl((now.tv_sec % (24*60*60))
965 * 1000 + now.tv_usec / 1000);
966 if (timing)
967 bcopy((void *)&tv32,
968 (void *)&outpack[ICMP_MINLEN + phdr_len],
969 sizeof(tv32));
970 }
971
972 cc = ICMP_MINLEN + phdr_len + datalen;
973
974 /* compute ICMP checksum here */
975 icp->icmp_cksum = in_cksum((u_short *)icp, cc);
976
977 if (options & F_HDRINCL) {
978 cc += sizeof(struct ip);
979 ip = (struct ip *)outpackhdr;
980 ip->ip_len = cc;
981 ip->ip_sum = in_cksum((u_short *)outpackhdr, cc);
982 packet = outpackhdr;
983 }
984 i = sendto(s, (char *)packet, cc, 0, (struct sockaddr *)&whereto,
985 sizeof(whereto));
986
987 if (i < 0 || i != cc) {
988 if (i < 0) {
989 if (options & F_FLOOD && errno == ENOBUFS) {
990 usleep(FLOOD_BACKOFF);
991 return;
992 }
993 warn("sendto");
994 } else {
995 warn("%s: partial write: %d of %d bytes",
996 hostname, i, cc);
997 }
998 }
999 ntransmitted++;
1000 sntransmitted++;
1001 if (!(options & F_QUIET) && options & F_FLOOD)
1002 (void)write(STDOUT_FILENO, &DOT, 1);
1003 }
1004
1005 /*
1006 * pr_pack --
1007 * Print out the packet, if it came from us. This logic is necessary
1008 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
1009 * which arrive ('tis only fair). This permits multiple copies of this
1010 * program to be run without having intermingled output (or statistics!).
1011 */
1012 static void
pr_pack(char * buf,int cc,struct sockaddr_in * from,struct timeval * tv)1013 pr_pack(char *buf, int cc, struct sockaddr_in *from, struct timeval *tv)
1014 {
1015 struct in_addr ina;
1016 u_char *cp, *dp;
1017 struct icmp *icp;
1018 struct ip *ip;
1019 const void *tp;
1020 double triptime;
1021 int dupflag, hlen, i, j, recv_len, seq;
1022 static int old_rrlen;
1023 static char old_rr[MAX_IPOPTLEN];
1024
1025 /* Check the IP header */
1026 ip = (struct ip *)buf;
1027 hlen = ip->ip_hl << 2;
1028 recv_len = cc;
1029 if (cc < hlen + ICMP_MINLEN) {
1030 if (options & F_VERBOSE)
1031 warn("packet too short (%d bytes) from %s", cc,
1032 inet_ntoa(from->sin_addr));
1033 return;
1034 }
1035
1036 /* Now the ICMP part */
1037 cc -= hlen;
1038 icp = (struct icmp *)(buf + hlen);
1039 if (icp->icmp_type == icmp_type_rsp) {
1040 if (icp->icmp_id != ident)
1041 return; /* 'Twas not our ECHO */
1042 ++nreceived;
1043 triptime = 0.0;
1044 if (timing) {
1045 struct timeval tv1;
1046 struct tv32 tv32;
1047 #ifndef icmp_data
1048 tp = &icp->icmp_ip;
1049 #else
1050 tp = icp->icmp_data;
1051 #endif
1052 tp = (const char *)tp + phdr_len;
1053
1054 if (cc - ICMP_MINLEN - phdr_len >= sizeof(tv1)) {
1055 /* Copy to avoid alignment problems: */
1056 memcpy(&tv32, tp, sizeof(tv32));
1057 tv1.tv_sec = ntohl(tv32.tv32_sec);
1058 tv1.tv_usec = ntohl(tv32.tv32_usec);
1059 tvsub(tv, &tv1);
1060 triptime = ((double)tv->tv_sec) * 1000.0 +
1061 ((double)tv->tv_usec) / 1000.0;
1062 tsum += triptime;
1063 tsumsq += triptime * triptime;
1064 if (triptime < tmin)
1065 tmin = triptime;
1066 if (triptime > tmax)
1067 tmax = triptime;
1068 } else
1069 timing = 0;
1070 }
1071
1072 seq = ntohs(icp->icmp_seq);
1073
1074 if (TST(seq % mx_dup_ck)) {
1075 ++nrepeats;
1076 --nreceived;
1077 dupflag = 1;
1078 } else {
1079 SET(seq % mx_dup_ck);
1080 dupflag = 0;
1081 }
1082
1083 if (options & F_QUIET)
1084 return;
1085
1086 if (options & F_WAITTIME && triptime > waittime) {
1087 ++nrcvtimeout;
1088 return;
1089 }
1090
1091 if (options & F_FLOOD)
1092 (void)write(STDOUT_FILENO, &BSPACE, 1);
1093 else {
1094 (void)printf("%d bytes from %s: icmp_seq=%u", cc,
1095 inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
1096 seq);
1097 (void)printf(" ttl=%d", ip->ip_ttl);
1098 if (timing)
1099 (void)printf(" time=%.3f ms", triptime);
1100 if (dupflag)
1101 (void)printf(" (DUP!)");
1102 if (options & F_AUDIBLE)
1103 (void)write(STDOUT_FILENO, &BBELL, 1);
1104 if (options & F_MASK) {
1105 /* Just prentend this cast isn't ugly */
1106 (void)printf(" mask=%s",
1107 pr_addr(*(struct in_addr *)&(icp->icmp_mask)));
1108 }
1109 if (options & F_TIME) {
1110 (void)printf(" tso=%s", pr_ntime(icp->icmp_otime));
1111 (void)printf(" tsr=%s", pr_ntime(icp->icmp_rtime));
1112 (void)printf(" tst=%s", pr_ntime(icp->icmp_ttime));
1113 }
1114 if (recv_len != send_len) {
1115 (void)printf(
1116 "\nwrong total length %d instead of %d",
1117 recv_len, send_len);
1118 }
1119 /* check the data */
1120 cp = (u_char*)&icp->icmp_data[phdr_len];
1121 dp = &outpack[ICMP_MINLEN + phdr_len];
1122 cc -= ICMP_MINLEN + phdr_len;
1123 i = 0;
1124 if (timing) { /* don't check variable timestamp */
1125 cp += TIMEVAL_LEN;
1126 dp += TIMEVAL_LEN;
1127 cc -= TIMEVAL_LEN;
1128 i += TIMEVAL_LEN;
1129 }
1130 for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) {
1131 if (*cp != *dp) {
1132 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
1133 i, *dp, *cp);
1134 (void)printf("\ncp:");
1135 cp = (u_char*)&icp->icmp_data[0];
1136 for (i = 0; i < datalen; ++i, ++cp) {
1137 if ((i % 16) == 8)
1138 (void)printf("\n\t");
1139 (void)printf("%2x ", *cp);
1140 }
1141 (void)printf("\ndp:");
1142 cp = &outpack[ICMP_MINLEN];
1143 for (i = 0; i < datalen; ++i, ++cp) {
1144 if ((i % 16) == 8)
1145 (void)printf("\n\t");
1146 (void)printf("%2x ", *cp);
1147 }
1148 break;
1149 }
1150 }
1151 }
1152 } else {
1153 /*
1154 * We've got something other than an ECHOREPLY.
1155 * See if it's a reply to something that we sent.
1156 * We can compare IP destination, protocol,
1157 * and ICMP type and ID.
1158 *
1159 * Only print all the error messages if we are running
1160 * as root to avoid leaking information not normally
1161 * available to those not running as root.
1162 */
1163 #ifndef icmp_data
1164 struct ip *oip = &icp->icmp_ip;
1165 #else
1166 struct ip *oip = (struct ip *)icp->icmp_data;
1167 #endif
1168 struct icmp *oicmp = (struct icmp *)(oip + 1);
1169
1170 if (((options & F_VERBOSE) && uid == 0) ||
1171 (!(options & F_QUIET2) &&
1172 (oip->ip_dst.s_addr == whereto.sin_addr.s_addr) &&
1173 (oip->ip_p == IPPROTO_ICMP) &&
1174 (oicmp->icmp_type == ICMP_ECHO) &&
1175 (oicmp->icmp_id == ident))) {
1176 (void)printf("%d bytes from %s: ", cc,
1177 pr_addr(from->sin_addr));
1178 pr_icmph(icp);
1179 } else
1180 return;
1181 }
1182
1183 /* Display any IP options */
1184 cp = (u_char *)buf + sizeof(struct ip);
1185
1186 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
1187 switch (*cp) {
1188 case IPOPT_EOL:
1189 hlen = 0;
1190 break;
1191 case IPOPT_LSRR:
1192 case IPOPT_SSRR:
1193 (void)printf(*cp == IPOPT_LSRR ?
1194 "\nLSRR: " : "\nSSRR: ");
1195 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1;
1196 hlen -= 2;
1197 cp += 2;
1198 if (j >= INADDR_LEN &&
1199 j <= hlen - (int)sizeof(struct ip)) {
1200 for (;;) {
1201 bcopy(++cp, &ina.s_addr, INADDR_LEN);
1202 if (ina.s_addr == 0)
1203 (void)printf("\t0.0.0.0");
1204 else
1205 (void)printf("\t%s",
1206 pr_addr(ina));
1207 hlen -= INADDR_LEN;
1208 cp += INADDR_LEN - 1;
1209 j -= INADDR_LEN;
1210 if (j < INADDR_LEN)
1211 break;
1212 (void)putchar('\n');
1213 }
1214 } else
1215 (void)printf("\t(truncated route)\n");
1216 break;
1217 case IPOPT_RR:
1218 j = cp[IPOPT_OLEN]; /* get length */
1219 i = cp[IPOPT_OFFSET]; /* and pointer */
1220 hlen -= 2;
1221 cp += 2;
1222 if (i > j)
1223 i = j;
1224 i = i - IPOPT_MINOFF + 1;
1225 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) {
1226 old_rrlen = 0;
1227 continue;
1228 }
1229 if (i == old_rrlen
1230 && !bcmp((char *)cp, old_rr, i)
1231 && !(options & F_FLOOD)) {
1232 (void)printf("\t(same route)");
1233 hlen -= i;
1234 cp += i;
1235 break;
1236 }
1237 old_rrlen = i;
1238 bcopy((char *)cp, old_rr, i);
1239 (void)printf("\nRR: ");
1240 if (i >= INADDR_LEN &&
1241 i <= hlen - (int)sizeof(struct ip)) {
1242 for (;;) {
1243 bcopy(++cp, &ina.s_addr, INADDR_LEN);
1244 if (ina.s_addr == 0)
1245 (void)printf("\t0.0.0.0");
1246 else
1247 (void)printf("\t%s",
1248 pr_addr(ina));
1249 hlen -= INADDR_LEN;
1250 cp += INADDR_LEN - 1;
1251 i -= INADDR_LEN;
1252 if (i < INADDR_LEN)
1253 break;
1254 (void)putchar('\n');
1255 }
1256 } else
1257 (void)printf("\t(truncated route)");
1258 break;
1259 case IPOPT_NOP:
1260 (void)printf("\nNOP");
1261 break;
1262 default:
1263 (void)printf("\nunknown option %x", *cp);
1264 break;
1265 }
1266 if (!(options & F_FLOOD)) {
1267 (void)putchar('\n');
1268 (void)fflush(stdout);
1269 }
1270 }
1271
1272 /*
1273 * in_cksum --
1274 * Checksum routine for Internet Protocol family headers (C Version)
1275 */
1276 u_short
in_cksum(u_short * addr,int len)1277 in_cksum(u_short *addr, int len)
1278 {
1279 int nleft, sum;
1280 u_short *w;
1281 union {
1282 u_short us;
1283 u_char uc[2];
1284 } last;
1285 u_short answer;
1286
1287 nleft = len;
1288 sum = 0;
1289 w = addr;
1290
1291 /*
1292 * Our algorithm is simple, using a 32 bit accumulator (sum), we add
1293 * sequential 16 bit words to it, and at the end, fold back all the
1294 * carry bits from the top 16 bits into the lower 16 bits.
1295 */
1296 while (nleft > 1) {
1297 sum += *w++;
1298 nleft -= 2;
1299 }
1300
1301 /* mop up an odd byte, if necessary */
1302 if (nleft == 1) {
1303 last.uc[0] = *(u_char *)w;
1304 last.uc[1] = 0;
1305 sum += last.us;
1306 }
1307
1308 /* add back carry outs from top 16 bits to low 16 bits */
1309 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1310 sum += (sum >> 16); /* add carry */
1311 answer = ~sum; /* truncate to 16 bits */
1312 return(answer);
1313 }
1314
1315 /*
1316 * tvsub --
1317 * Subtract 2 timeval structs: out = out - in. Out is assumed to
1318 * be >= in.
1319 */
1320 static void
tvsub(struct timeval * out,const struct timeval * in)1321 tvsub(struct timeval *out, const struct timeval *in)
1322 {
1323
1324 if ((out->tv_usec -= in->tv_usec) < 0) {
1325 --out->tv_sec;
1326 out->tv_usec += 1000000;
1327 }
1328 out->tv_sec -= in->tv_sec;
1329 }
1330
1331 /*
1332 * status --
1333 * Print out statistics when SIGINFO is received.
1334 */
1335
1336 static void
status(int sig __unused)1337 status(int sig __unused)
1338 {
1339
1340 siginfo_p = 1;
1341 }
1342
1343 static void
check_status(void)1344 check_status(void)
1345 {
1346
1347 if (siginfo_p) {
1348 siginfo_p = 0;
1349 (void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)",
1350 nreceived, ntransmitted,
1351 ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0);
1352 if (nreceived && timing)
1353 (void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max",
1354 tmin, tsum / (nreceived + nrepeats), tmax);
1355 (void)fprintf(stderr, "\n");
1356 }
1357 }
1358
1359 /*
1360 * finish --
1361 * Print out statistics, and give up.
1362 */
1363 static void
finish(void)1364 finish(void)
1365 {
1366
1367 (void)signal(SIGINT, SIG_IGN);
1368 (void)signal(SIGALRM, SIG_IGN);
1369 (void)putchar('\n');
1370 (void)fflush(stdout);
1371 (void)printf("--- %s ping statistics ---\n", hostname);
1372 (void)printf("%ld packets transmitted, ", ntransmitted);
1373 (void)printf("%ld packets received, ", nreceived);
1374 if (nrepeats)
1375 (void)printf("+%ld duplicates, ", nrepeats);
1376 if (ntransmitted) {
1377 if (nreceived > ntransmitted)
1378 (void)printf("-- somebody's printing up packets!");
1379 else
1380 (void)printf("%.1f%% packet loss",
1381 ((ntransmitted - nreceived) * 100.0) /
1382 ntransmitted);
1383 }
1384 if (nrcvtimeout)
1385 (void)printf(", %ld packets out of wait time", nrcvtimeout);
1386 (void)putchar('\n');
1387 if (nreceived && timing) {
1388 double n = nreceived + nrepeats;
1389 double avg = tsum / n;
1390 double vari = tsumsq / n - avg * avg;
1391 (void)printf(
1392 "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n",
1393 tmin, avg, tmax, sqrt(vari));
1394 }
1395
1396 if (nreceived)
1397 exit(0);
1398 else
1399 exit(2);
1400 }
1401
1402 #ifdef notdef
1403 static char *ttab[] = {
1404 "Echo Reply", /* ip + seq + udata */
1405 "Dest Unreachable", /* net, host, proto, port, frag, sr + IP */
1406 "Source Quench", /* IP */
1407 "Redirect", /* redirect type, gateway, + IP */
1408 "Echo",
1409 "Time Exceeded", /* transit, frag reassem + IP */
1410 "Parameter Problem", /* pointer + IP */
1411 "Timestamp", /* id + seq + three timestamps */
1412 "Timestamp Reply", /* " */
1413 "Info Request", /* id + sq */
1414 "Info Reply" /* " */
1415 };
1416 #endif
1417
1418 /*
1419 * pr_icmph --
1420 * Print a descriptive string about an ICMP header.
1421 */
1422 static void
pr_icmph(struct icmp * icp)1423 pr_icmph(struct icmp *icp)
1424 {
1425
1426 switch(icp->icmp_type) {
1427 case ICMP_ECHOREPLY:
1428 (void)printf("Echo Reply\n");
1429 /* XXX ID + Seq + Data */
1430 break;
1431 case ICMP_UNREACH:
1432 switch(icp->icmp_code) {
1433 case ICMP_UNREACH_NET:
1434 (void)printf("Destination Net Unreachable\n");
1435 break;
1436 case ICMP_UNREACH_HOST:
1437 (void)printf("Destination Host Unreachable\n");
1438 break;
1439 case ICMP_UNREACH_PROTOCOL:
1440 (void)printf("Destination Protocol Unreachable\n");
1441 break;
1442 case ICMP_UNREACH_PORT:
1443 (void)printf("Destination Port Unreachable\n");
1444 break;
1445 case ICMP_UNREACH_NEEDFRAG:
1446 (void)printf("frag needed and DF set (MTU %d)\n",
1447 ntohs(icp->icmp_nextmtu));
1448 break;
1449 case ICMP_UNREACH_SRCFAIL:
1450 (void)printf("Source Route Failed\n");
1451 break;
1452 case ICMP_UNREACH_FILTER_PROHIB:
1453 (void)printf("Communication prohibited by filter\n");
1454 break;
1455 default:
1456 (void)printf("Dest Unreachable, Bad Code: %d\n",
1457 icp->icmp_code);
1458 break;
1459 }
1460 /* Print returned IP header information */
1461 #ifndef icmp_data
1462 pr_retip(&icp->icmp_ip);
1463 #else
1464 pr_retip((struct ip *)icp->icmp_data);
1465 #endif
1466 break;
1467 case ICMP_SOURCEQUENCH:
1468 (void)printf("Source Quench\n");
1469 #ifndef icmp_data
1470 pr_retip(&icp->icmp_ip);
1471 #else
1472 pr_retip((struct ip *)icp->icmp_data);
1473 #endif
1474 break;
1475 case ICMP_REDIRECT:
1476 switch(icp->icmp_code) {
1477 case ICMP_REDIRECT_NET:
1478 (void)printf("Redirect Network");
1479 break;
1480 case ICMP_REDIRECT_HOST:
1481 (void)printf("Redirect Host");
1482 break;
1483 case ICMP_REDIRECT_TOSNET:
1484 (void)printf("Redirect Type of Service and Network");
1485 break;
1486 case ICMP_REDIRECT_TOSHOST:
1487 (void)printf("Redirect Type of Service and Host");
1488 break;
1489 default:
1490 (void)printf("Redirect, Bad Code: %d", icp->icmp_code);
1491 break;
1492 }
1493 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
1494 #ifndef icmp_data
1495 pr_retip(&icp->icmp_ip);
1496 #else
1497 pr_retip((struct ip *)icp->icmp_data);
1498 #endif
1499 break;
1500 case ICMP_ECHO:
1501 (void)printf("Echo Request\n");
1502 /* XXX ID + Seq + Data */
1503 break;
1504 case ICMP_TIMXCEED:
1505 switch(icp->icmp_code) {
1506 case ICMP_TIMXCEED_INTRANS:
1507 (void)printf("Time to live exceeded\n");
1508 break;
1509 case ICMP_TIMXCEED_REASS:
1510 (void)printf("Frag reassembly time exceeded\n");
1511 break;
1512 default:
1513 (void)printf("Time exceeded, Bad Code: %d\n",
1514 icp->icmp_code);
1515 break;
1516 }
1517 #ifndef icmp_data
1518 pr_retip(&icp->icmp_ip);
1519 #else
1520 pr_retip((struct ip *)icp->icmp_data);
1521 #endif
1522 break;
1523 case ICMP_PARAMPROB:
1524 (void)printf("Parameter problem: pointer = 0x%02x\n",
1525 icp->icmp_hun.ih_pptr);
1526 #ifndef icmp_data
1527 pr_retip(&icp->icmp_ip);
1528 #else
1529 pr_retip((struct ip *)icp->icmp_data);
1530 #endif
1531 break;
1532 case ICMP_TSTAMP:
1533 (void)printf("Timestamp\n");
1534 /* XXX ID + Seq + 3 timestamps */
1535 break;
1536 case ICMP_TSTAMPREPLY:
1537 (void)printf("Timestamp Reply\n");
1538 /* XXX ID + Seq + 3 timestamps */
1539 break;
1540 case ICMP_IREQ:
1541 (void)printf("Information Request\n");
1542 /* XXX ID + Seq */
1543 break;
1544 case ICMP_IREQREPLY:
1545 (void)printf("Information Reply\n");
1546 /* XXX ID + Seq */
1547 break;
1548 case ICMP_MASKREQ:
1549 (void)printf("Address Mask Request\n");
1550 break;
1551 case ICMP_MASKREPLY:
1552 (void)printf("Address Mask Reply\n");
1553 break;
1554 case ICMP_ROUTERADVERT:
1555 (void)printf("Router Advertisement\n");
1556 break;
1557 case ICMP_ROUTERSOLICIT:
1558 (void)printf("Router Solicitation\n");
1559 break;
1560 default:
1561 (void)printf("Bad ICMP type: %d\n", icp->icmp_type);
1562 }
1563 }
1564
1565 /*
1566 * pr_iph --
1567 * Print an IP header with options.
1568 */
1569 static void
pr_iph(struct ip * ip)1570 pr_iph(struct ip *ip)
1571 {
1572 u_char *cp;
1573 int hlen;
1574
1575 hlen = ip->ip_hl << 2;
1576 cp = (u_char *)ip + 20; /* point to options */
1577
1578 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\n");
1579 (void)printf(" %1x %1x %02x %04x %04x",
1580 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
1581 ntohs(ip->ip_id));
1582 (void)printf(" %1lx %04lx",
1583 (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13,
1584 (u_long) ntohl(ip->ip_off) & 0x1fff);
1585 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p,
1586 ntohs(ip->ip_sum));
1587 (void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr));
1588 (void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr));
1589 /* dump any option bytes */
1590 while (hlen-- > 20) {
1591 (void)printf("%02x", *cp++);
1592 }
1593 (void)putchar('\n');
1594 }
1595
1596 /*
1597 * pr_addr --
1598 * Return an ascii host address as a dotted quad and optionally with
1599 * a hostname.
1600 */
1601 static char *
pr_addr(struct in_addr ina)1602 pr_addr(struct in_addr ina)
1603 {
1604 struct hostent *hp;
1605 static char buf[16 + 3 + MAXHOSTNAMELEN];
1606
1607 if ((options & F_NUMERIC) ||
1608 !(hp = gethostbyaddr((char *)&ina, 4, AF_INET)))
1609 return inet_ntoa(ina);
1610 else
1611 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
1612 inet_ntoa(ina));
1613 return(buf);
1614 }
1615
1616 /*
1617 * pr_retip --
1618 * Dump some info on a returned (via ICMP) IP packet.
1619 */
1620 static void
pr_retip(struct ip * ip)1621 pr_retip(struct ip *ip)
1622 {
1623 u_char *cp;
1624 int hlen;
1625
1626 pr_iph(ip);
1627 hlen = ip->ip_hl << 2;
1628 cp = (u_char *)ip + hlen;
1629
1630 if (ip->ip_p == 6)
1631 (void)printf("TCP: from port %u, to port %u (decimal)\n",
1632 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
1633 else if (ip->ip_p == 17)
1634 (void)printf("UDP: from port %u, to port %u (decimal)\n",
1635 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
1636 }
1637
1638 static char *
pr_ntime(n_time timestamp)1639 pr_ntime(n_time timestamp)
1640 {
1641 static char buf[10];
1642 int hour, min, sec;
1643
1644 sec = ntohl(timestamp) / 1000;
1645 hour = sec / 60 / 60;
1646 min = (sec % (60 * 60)) / 60;
1647 sec = (sec % (60 * 60)) % 60;
1648
1649 (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec);
1650
1651 return (buf);
1652 }
1653
1654 static void
fill(char * bp,char * patp)1655 fill(char *bp, char *patp)
1656 {
1657 char *cp;
1658 int pat[16];
1659 u_int ii, jj, kk;
1660
1661 for (cp = patp; *cp; cp++) {
1662 if (!isxdigit(*cp))
1663 errx(EX_USAGE,
1664 "patterns must be specified as hex digits");
1665
1666 }
1667 ii = sscanf(patp,
1668 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
1669 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
1670 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
1671 &pat[13], &pat[14], &pat[15]);
1672
1673 if (ii > 0)
1674 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii)
1675 for (jj = 0; jj < ii; ++jj)
1676 bp[jj + kk] = pat[jj];
1677 if (!(options & F_QUIET)) {
1678 (void)printf("PATTERN: 0x");
1679 for (jj = 0; jj < ii; ++jj)
1680 (void)printf("%02x", bp[jj] & 0xFF);
1681 (void)printf("\n");
1682 }
1683 }
1684
1685 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
1686 #define SECOPT " [-P policy]"
1687 #else
1688 #define SECOPT ""
1689 #endif
1690 static void
usage(void)1691 usage(void)
1692 {
1693
1694 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1695 "usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
1696 " [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
1697 " " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
1698 " [-W waittime] [-z tos] host",
1699 " ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
1700 " [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
1701 " [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
1702 " [-z tos] mcast-group");
1703 exit(EX_USAGE);
1704 }
1705