1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Mike Muuss.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /*
36 * P I N G . C
37 *
38 * Using the Internet Control Message Protocol (ICMP) "ECHO" facility,
39 * measure round-trip-delays and packet loss across network paths.
40 *
41 * Author -
42 * Mike Muuss
43 * U. S. Army Ballistic Research Laboratory
44 * December, 1983
45 *
46 * Status -
47 * Public Domain. Distribution Unlimited.
48 * Bugs -
49 * More statistics could always be gathered.
50 * This program has to run SUID to ROOT to access the ICMP socket.
51 */
52
53 #include <sys/param.h> /* NB: we rely on this for <sys/types.h> */
54 #include <sys/capsicum.h>
55 #include <sys/socket.h>
56 #include <sys/sysctl.h>
57 #include <sys/time.h>
58 #include <sys/uio.h>
59
60 #include <netinet/in.h>
61 #include <netinet/in_systm.h>
62 #include <netinet/ip.h>
63 #include <netinet/ip_icmp.h>
64 #include <netinet/ip_var.h>
65 #include <arpa/inet.h>
66
67 #include <libcasper.h>
68 #include <casper/cap_dns.h>
69
70 #ifdef IPSEC
71 #include <netipsec/ipsec.h>
72 #endif /*IPSEC*/
73
74 #include <capsicum_helpers.h>
75 #include <ctype.h>
76 #include <err.h>
77 #include <errno.h>
78 #include <netdb.h>
79 #include <stddef.h>
80 #include <signal.h>
81 #include <stdio.h>
82 #include <stdlib.h>
83 #include <string.h>
84 #include <sysexits.h>
85 #include <time.h>
86 #include <unistd.h>
87
88 #include "main.h"
89 #include "ping.h"
90 #include "utils.h"
91
92 #define INADDR_LEN ((int)sizeof(in_addr_t))
93 #define TIMEVAL_LEN ((int)sizeof(struct tv32))
94 #define MASK_LEN (ICMP_MASKLEN - ICMP_MINLEN)
95 #define TS_LEN (ICMP_TSLEN - ICMP_MINLEN)
96 #define DEFDATALEN 56 /* default data length */
97 #define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */
98 /* runs out of buffer space */
99 #define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN)
100 #define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN)
101 #define MAXWAIT 10000 /* max ms to wait for response */
102 #define MAXALARM (60 * 60) /* max seconds for alarm timeout */
103 #define MAXTOS 255
104
105 #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
106 #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
107 #define SET(bit) (A(bit) |= B(bit))
108 #define CLR(bit) (A(bit) &= (~B(bit)))
109 #define TST(bit) (A(bit) & B(bit))
110
111 struct tv32 {
112 int32_t tv32_sec;
113 int32_t tv32_nsec;
114 };
115
116 /* various options */
117 #define F_FLOOD 0x0001
118 #define F_INTERVAL 0x0002
119 #define F_PINGFILLED 0x0008
120 #define F_QUIET 0x0010
121 #define F_RROUTE 0x0020
122 #define F_SO_DEBUG 0x0040
123 #define F_SO_DONTROUTE 0x0080
124 #define F_VERBOSE 0x0100
125 #define F_QUIET2 0x0200
126 #define F_NOLOOP 0x0400
127 #define F_MTTL 0x0800
128 #define F_MIF 0x1000
129 #define F_AUDIBLE 0x2000
130 #ifdef IPSEC
131 #ifdef IPSEC_POLICY_IPSEC
132 #define F_POLICY 0x4000
133 #endif /*IPSEC_POLICY_IPSEC*/
134 #endif /*IPSEC*/
135 #define F_TTL 0x8000
136 #define F_MISSED 0x10000
137 #define F_ONCE 0x20000
138 #define F_HDRINCL 0x40000
139 #define F_MASK 0x80000
140 #define F_TIME 0x100000
141 #define F_SWEEP 0x200000
142 #define F_WAITTIME 0x400000
143 #define F_IP_VLAN_PCP 0x800000
144 #define F_DOT 0x1000000
145
146 /*
147 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
148 * number of received sequence numbers we can keep track of. Change 128
149 * to 8192 for complete accuracy...
150 */
151 #define MAX_DUP_CHK (8 * 128)
152 static int mx_dup_ck = MAX_DUP_CHK;
153 static char rcvd_tbl[MAX_DUP_CHK / 8];
154
155 static struct sockaddr_in whereto; /* who to ping */
156 static int datalen = DEFDATALEN;
157 static int maxpayload;
158 static int ssend; /* send socket file descriptor */
159 static int srecv; /* receive socket file descriptor */
160 static u_char outpackhdr[IP_MAXPACKET], *outpack;
161 static char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */
162 static char BSPACE = '\b'; /* characters written for flood */
163 static const char *DOT = ".";
164 static size_t DOTlen = 1;
165 static size_t DOTidx = 0;
166 static char *shostname;
167 static int ident; /* process id to identify our packets */
168 static int uid; /* cached uid for micro-optimization */
169 static u_char icmp_type = ICMP_ECHO;
170 static u_char icmp_type_rsp = ICMP_ECHOREPLY;
171 static int phdr_len = 0;
172 static int send_len;
173
174 /* counters */
175 static long nmissedmax; /* max value of ntransmitted - nreceived - 1 */
176 static long npackets; /* max packets to transmit */
177 static long snpackets; /* max packets to transmit in one sweep */
178 static long sntransmitted; /* # of packets we sent in this sweep */
179 static int sweepmax; /* max value of payload in sweep */
180 static int sweepmin = 0; /* start value of payload in sweep */
181 static int sweepincr = 1; /* payload increment in sweep */
182 static int interval = 1000; /* interval between packets, ms */
183 static int waittime = MAXWAIT; /* timeout for each packet */
184
185 static cap_channel_t *capdns;
186
187 static void fill(char *, char *);
188 static cap_channel_t *capdns_setup(void);
189 static void pinger(void);
190 static char *pr_addr(struct in_addr);
191 static char *pr_ntime(n_time);
192 static void pr_icmph(struct icmp *, struct ip *, const u_char *const);
193 static void pr_iph(struct ip *, const u_char *);
194 static void pr_pack(char *, ssize_t, struct sockaddr_in *, struct timespec *);
195
196 int
ping(int argc,char * const * argv)197 ping(int argc, char *const *argv)
198 {
199 struct sockaddr_in from, sock_in;
200 struct in_addr ifaddr;
201 struct timespec last, intvl;
202 struct iovec iov;
203 struct msghdr msg;
204 struct sigaction si_sa;
205 size_t sz;
206 u_char *datap, packet[IP_MAXPACKET] __aligned(4);
207 const char *errstr;
208 char *ep, *source, *target, *payload;
209 struct hostent *hp;
210 #ifdef IPSEC_POLICY_IPSEC
211 char *policy_in, *policy_out;
212 #endif
213 struct sockaddr_in *to;
214 double t;
215 u_long alarmtimeout;
216 long long ltmp;
217 int almost_done, ch, df, hold, i, icmp_len, mib[4], preload;
218 int ssend_errno, srecv_errno, tos, ttl, pcp;
219 char ctrl[CMSG_SPACE(sizeof(struct timespec))];
220 char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN];
221 #ifdef IP_OPTIONS
222 char rspace[MAX_IPOPTLEN]; /* record route space */
223 #endif
224 unsigned char loop, mttl;
225
226 payload = source = NULL;
227 #ifdef IPSEC_POLICY_IPSEC
228 policy_in = policy_out = NULL;
229 #endif
230 cap_rights_t rights;
231
232 /*
233 * Do the stuff that we need root priv's for *first*, and
234 * then drop our setuid bit. Save error reporting for
235 * after arg parsing.
236 *
237 * Historicaly ping was using one socket 's' for sending and for
238 * receiving. After capsicum(4) related changes we use two
239 * sockets. It was done for special ping use case - when user
240 * issue ping on multicast or broadcast address replies come
241 * from different addresses, not from the address we
242 * connect(2)'ed to, and send socket do not receive those
243 * packets.
244 */
245 ssend = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
246 ssend_errno = errno;
247 srecv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
248 srecv_errno = errno;
249
250 if (setuid(getuid()) != 0)
251 err(EX_NOPERM, "setuid() failed");
252 uid = getuid();
253
254 if (ssend < 0) {
255 errno = ssend_errno;
256 err(EX_OSERR, "ssend socket");
257 }
258
259 if (srecv < 0) {
260 errno = srecv_errno;
261 err(EX_OSERR, "srecv socket");
262 }
263
264 alarmtimeout = df = preload = tos = pcp = 0;
265
266 outpack = outpackhdr + sizeof(struct ip);
267 while ((ch = getopt(argc, argv, PING4OPTS)) != -1) {
268 switch(ch) {
269 case '.':
270 options |= F_DOT;
271 if (optarg != NULL) {
272 DOT = optarg;
273 DOTlen = strlen(optarg);
274 }
275 break;
276 case '4':
277 /* This option is processed in main(). */
278 break;
279 case 'A':
280 options |= F_MISSED;
281 break;
282 case 'a':
283 options |= F_AUDIBLE;
284 break;
285 case 'C':
286 options |= F_IP_VLAN_PCP;
287 ltmp = strtonum(optarg, -1, 7, &errstr);
288 if (errstr != NULL)
289 errx(EX_USAGE, "invalid PCP: `%s'", optarg);
290 pcp = ltmp;
291 break;
292 case 'c':
293 ltmp = strtonum(optarg, 1, LONG_MAX, &errstr);
294 if (errstr != NULL)
295 errx(EX_USAGE,
296 "invalid count of packets to transmit: `%s'",
297 optarg);
298 npackets = (long)ltmp;
299 break;
300 case 'D':
301 options |= F_HDRINCL;
302 df = 1;
303 break;
304 case 'd':
305 options |= F_SO_DEBUG;
306 break;
307 case 'f':
308 if (uid) {
309 errno = EPERM;
310 err(EX_NOPERM, "-f flag");
311 }
312 options |= F_FLOOD;
313 options |= F_DOT;
314 setbuf(stdout, (char *)NULL);
315 break;
316 case 'G': /* Maximum payload size for ping sweep */
317 ltmp = strtonum(optarg, 1, INT_MAX, &errstr);
318 if (errstr != NULL) {
319 errx(EX_USAGE, "invalid payload size: `%s'",
320 optarg);
321 }
322 sweepmax = (int)ltmp;
323 if (uid != 0 && sweepmax > DEFDATALEN) {
324 errc(EX_NOPERM, EPERM,
325 "payload size too large: %d > %u",
326 sweepmax, DEFDATALEN);
327 }
328 options |= F_SWEEP;
329 break;
330 case 'g': /* Minimum payload size for ping sweep */
331 ltmp = strtonum(optarg, 0, INT_MAX, &errstr);
332 if (errstr != NULL) {
333 errx(EX_USAGE, "invalid payload size: `%s'",
334 optarg);
335 }
336 sweepmin = (int)ltmp;
337 if (uid != 0 && sweepmin > DEFDATALEN) {
338 errc(EX_NOPERM, EPERM,
339 "payload size too large: %d > %u",
340 sweepmin, DEFDATALEN);
341 }
342 options |= F_SWEEP;
343 break;
344 case 'H':
345 options |= F_HOSTNAME;
346 break;
347 case 'h': /* Payload size increment for ping sweep */
348 ltmp = strtonum(optarg, 1, INT_MAX, &errstr);
349 if (errstr != NULL) {
350 errx(EX_USAGE, "invalid payload size: `%s'",
351 optarg);
352 }
353 sweepincr = (int)ltmp;
354 if (uid != 0 && sweepincr > DEFDATALEN) {
355 errc(EX_NOPERM, EPERM,
356 "payload size too large: %d > %u",
357 sweepincr, DEFDATALEN);
358 }
359 options |= F_SWEEP;
360 break;
361 case 'I': /* multicast interface */
362 if (inet_aton(optarg, &ifaddr) == 0)
363 errx(EX_USAGE,
364 "invalid multicast interface: `%s'",
365 optarg);
366 options |= F_MIF;
367 break;
368 case 'i': /* wait between sending packets */
369 t = strtod(optarg, &ep) * 1000.0;
370 if (*ep || ep == optarg || t > (double)INT_MAX)
371 errx(EX_USAGE, "invalid timing interval: `%s'",
372 optarg);
373 options |= F_INTERVAL;
374 interval = (int)t;
375 if (uid && interval < 1000) {
376 errno = EPERM;
377 err(EX_NOPERM, "-i interval too short");
378 }
379 break;
380 case 'L':
381 options |= F_NOLOOP;
382 loop = 0;
383 break;
384 case 'l':
385 ltmp = strtonum(optarg, 0, INT_MAX, &errstr);
386 if (errstr != NULL)
387 errx(EX_USAGE,
388 "invalid preload value: `%s'", optarg);
389 if (uid) {
390 errno = EPERM;
391 err(EX_NOPERM, "-l flag");
392 }
393 preload = (int)ltmp;
394 break;
395 case 'M':
396 switch(optarg[0]) {
397 case 'M':
398 case 'm':
399 options |= F_MASK;
400 break;
401 case 'T':
402 case 't':
403 options |= F_TIME;
404 break;
405 default:
406 errx(EX_USAGE, "invalid message: `%c'", optarg[0]);
407 break;
408 }
409 break;
410 case 'm': /* TTL */
411 ltmp = strtonum(optarg, 0, MAXTTL, &errstr);
412 if (errstr != NULL)
413 errx(EX_USAGE, "invalid TTL: `%s'", optarg);
414 ttl = (int)ltmp;
415 options |= F_TTL;
416 break;
417 case 'n':
418 options &= ~F_HOSTNAME;
419 break;
420 case 'o':
421 options |= F_ONCE;
422 break;
423 #ifdef IPSEC
424 #ifdef IPSEC_POLICY_IPSEC
425 case 'P':
426 options |= F_POLICY;
427 if (!strncmp("in", optarg, 2))
428 policy_in = strdup(optarg);
429 else if (!strncmp("out", optarg, 3))
430 policy_out = strdup(optarg);
431 else
432 errx(1, "invalid security policy");
433 break;
434 #endif /*IPSEC_POLICY_IPSEC*/
435 #endif /*IPSEC*/
436 case 'p': /* fill buffer with user pattern */
437 options |= F_PINGFILLED;
438 payload = optarg;
439 break;
440 case 'Q':
441 options |= F_QUIET2;
442 break;
443 case 'q':
444 options |= F_QUIET;
445 break;
446 case 'R':
447 options |= F_RROUTE;
448 break;
449 case 'r':
450 options |= F_SO_DONTROUTE;
451 break;
452 case 'S':
453 source = optarg;
454 break;
455 case 's': /* size of packet to send */
456 ltmp = strtonum(optarg, 0, INT_MAX, &errstr);
457 if (errstr != NULL)
458 errx(EX_USAGE, "invalid packet size: `%s'",
459 optarg);
460 datalen = (int)ltmp;
461 if (uid != 0 && datalen > DEFDATALEN) {
462 errno = EPERM;
463 err(EX_NOPERM,
464 "packet size too large: %d > %u",
465 datalen, DEFDATALEN);
466 }
467 break;
468 case 'T': /* multicast TTL */
469 ltmp = strtonum(optarg, 0, MAXTTL, &errstr);
470 if (errstr != NULL)
471 errx(EX_USAGE, "invalid multicast TTL: `%s'",
472 optarg);
473 mttl = (unsigned char)ltmp;
474 options |= F_MTTL;
475 break;
476 case 't':
477 alarmtimeout = strtoul(optarg, &ep, 0);
478 if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
479 errx(EX_USAGE, "invalid timeout: `%s'",
480 optarg);
481 if (alarmtimeout > MAXALARM)
482 errx(EX_USAGE, "invalid timeout: `%s' > %d",
483 optarg, MAXALARM);
484 {
485 struct itimerval itv;
486
487 timerclear(&itv.it_interval);
488 timerclear(&itv.it_value);
489 itv.it_value.tv_sec = (time_t)alarmtimeout;
490 if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
491 err(1, "setitimer");
492 }
493 break;
494 case 'v':
495 options |= F_VERBOSE;
496 break;
497 case 'W': /* wait ms for answer */
498 t = strtod(optarg, &ep);
499 if (*ep || ep == optarg || t > (double)INT_MAX)
500 errx(EX_USAGE, "invalid timing interval: `%s'",
501 optarg);
502 options |= F_WAITTIME;
503 waittime = (int)t;
504 break;
505 case 'z':
506 options |= F_HDRINCL;
507 ltmp = strtol(optarg, &ep, 0);
508 if (*ep || ep == optarg || ltmp > MAXTOS || ltmp < 0)
509 errx(EX_USAGE, "invalid TOS: `%s'", optarg);
510 tos = ltmp;
511 break;
512 default:
513 usage();
514 }
515 }
516
517 if (argc - optind != 1)
518 usage();
519 target = argv[optind];
520
521 switch (options & (F_MASK|F_TIME)) {
522 case 0: break;
523 case F_MASK:
524 icmp_type = ICMP_MASKREQ;
525 icmp_type_rsp = ICMP_MASKREPLY;
526 phdr_len = MASK_LEN;
527 if (!(options & F_QUIET))
528 (void)printf("ICMP_MASKREQ\n");
529 break;
530 case F_TIME:
531 icmp_type = ICMP_TSTAMP;
532 icmp_type_rsp = ICMP_TSTAMPREPLY;
533 phdr_len = TS_LEN;
534 if (!(options & F_QUIET))
535 (void)printf("ICMP_TSTAMP\n");
536 break;
537 default:
538 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive.");
539 break;
540 }
541 icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len;
542 if (options & F_RROUTE)
543 icmp_len += MAX_IPOPTLEN;
544 maxpayload = IP_MAXPACKET - icmp_len;
545 if (datalen > maxpayload)
546 errx(EX_USAGE, "packet size too large: %d > %d", datalen,
547 maxpayload);
548 send_len = icmp_len + datalen;
549 datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN];
550 if (options & F_PINGFILLED) {
551 fill((char *)datap, payload);
552 }
553 capdns = capdns_setup();
554 if (source) {
555 bzero((char *)&sock_in, sizeof(sock_in));
556 sock_in.sin_family = AF_INET;
557 if (inet_aton(source, &sock_in.sin_addr) != 0) {
558 shostname = source;
559 } else {
560 hp = cap_gethostbyname2(capdns, source, AF_INET);
561 if (!hp)
562 errx(EX_NOHOST, "cannot resolve %s: %s",
563 source, hstrerror(h_errno));
564
565 sock_in.sin_len = sizeof sock_in;
566 if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) ||
567 hp->h_length < 0)
568 errx(1, "gethostbyname2: illegal address");
569 memcpy(&sock_in.sin_addr, hp->h_addr_list[0],
570 sizeof(sock_in.sin_addr));
571 (void)strncpy(snamebuf, hp->h_name,
572 sizeof(snamebuf) - 1);
573 snamebuf[sizeof(snamebuf) - 1] = '\0';
574 shostname = snamebuf;
575 }
576 if (bind(ssend, (struct sockaddr *)&sock_in, sizeof sock_in) ==
577 -1)
578 err(1, "bind");
579 }
580
581 bzero(&whereto, sizeof(whereto));
582 to = &whereto;
583 to->sin_family = AF_INET;
584 to->sin_len = sizeof *to;
585 if (inet_aton(target, &to->sin_addr) != 0) {
586 hostname = target;
587 } else {
588 hp = cap_gethostbyname2(capdns, target, AF_INET);
589 if (!hp)
590 errx(EX_NOHOST, "cannot resolve %s: %s",
591 target, hstrerror(h_errno));
592
593 if ((unsigned)hp->h_length > sizeof(to->sin_addr))
594 errx(1, "gethostbyname2 returned an illegal address");
595 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
596 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
597 hnamebuf[sizeof(hnamebuf) - 1] = '\0';
598 hostname = hnamebuf;
599 }
600
601 /* From now on we will use only reverse DNS lookups. */
602 #ifdef WITH_CASPER
603 if (capdns != NULL) {
604 const char *types[1];
605
606 types[0] = "ADDR2NAME";
607 if (cap_dns_type_limit(capdns, types, 1) < 0)
608 err(1, "unable to limit access to system.dns service");
609 }
610 #endif
611 if (connect(ssend, (struct sockaddr *)&whereto, sizeof(whereto)) != 0)
612 err(1, "connect");
613
614 if (options & F_FLOOD && options & F_INTERVAL)
615 errx(EX_USAGE, "-f and -i: incompatible options");
616
617 if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
618 errx(EX_USAGE,
619 "-f flag cannot be used with multicast destination");
620 if (options & (F_MIF | F_NOLOOP | F_MTTL)
621 && !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
622 errx(EX_USAGE,
623 "-I, -L, -T flags cannot be used with unicast destination");
624
625 if (datalen >= TIMEVAL_LEN) /* can we time transfer */
626 timing = 1;
627
628 if ((options & (F_PINGFILLED | F_SWEEP)) == 0)
629 for (i = TIMEVAL_LEN; i < datalen; ++i)
630 *datap++ = i;
631
632 ident = getpid() & 0xFFFF;
633
634 hold = 1;
635 if (options & F_SO_DEBUG) {
636 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold,
637 sizeof(hold));
638 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold,
639 sizeof(hold));
640 }
641 if (options & F_SO_DONTROUTE)
642 (void)setsockopt(ssend, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
643 sizeof(hold));
644 if (options & F_IP_VLAN_PCP) {
645 (void)setsockopt(ssend, IPPROTO_IP, IP_VLAN_PCP, (char *)&pcp,
646 sizeof(pcp));
647 }
648 #ifdef IPSEC
649 #ifdef IPSEC_POLICY_IPSEC
650 if (options & F_POLICY) {
651 char *buf;
652 if (policy_in != NULL) {
653 buf = ipsec_set_policy(policy_in, strlen(policy_in));
654 if (buf == NULL)
655 errx(EX_CONFIG, "%s", ipsec_strerror());
656 if (setsockopt(srecv, IPPROTO_IP, IP_IPSEC_POLICY,
657 buf, ipsec_get_policylen(buf)) < 0)
658 err(EX_CONFIG,
659 "ipsec policy cannot be configured");
660 free(buf);
661 }
662
663 if (policy_out != NULL) {
664 buf = ipsec_set_policy(policy_out, strlen(policy_out));
665 if (buf == NULL)
666 errx(EX_CONFIG, "%s", ipsec_strerror());
667 if (setsockopt(ssend, IPPROTO_IP, IP_IPSEC_POLICY,
668 buf, ipsec_get_policylen(buf)) < 0)
669 err(EX_CONFIG,
670 "ipsec policy cannot be configured");
671 free(buf);
672 }
673 }
674 #endif /*IPSEC_POLICY_IPSEC*/
675 #endif /*IPSEC*/
676
677 if (options & F_HDRINCL) {
678 struct ip ip;
679
680 memcpy(&ip, outpackhdr, sizeof(ip));
681 if (!(options & (F_TTL | F_MTTL))) {
682 mib[0] = CTL_NET;
683 mib[1] = PF_INET;
684 mib[2] = IPPROTO_IP;
685 mib[3] = IPCTL_DEFTTL;
686 sz = sizeof(ttl);
687 if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1)
688 err(1, "sysctl(net.inet.ip.ttl)");
689 }
690 setsockopt(ssend, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
691 ip.ip_v = IPVERSION;
692 ip.ip_hl = sizeof(struct ip) >> 2;
693 ip.ip_tos = tos;
694 ip.ip_id = 0;
695 ip.ip_off = htons(df ? IP_DF : 0);
696 ip.ip_ttl = ttl;
697 ip.ip_p = IPPROTO_ICMP;
698 ip.ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY;
699 ip.ip_dst = to->sin_addr;
700 memcpy(outpackhdr, &ip, sizeof(ip));
701 }
702
703 /*
704 * Here we enter capability mode. Further down access to global
705 * namespaces (e.g filesystem) is restricted (see capsicum(4)).
706 * We must connect(2) our socket before this point.
707 */
708 caph_cache_catpages();
709 if (caph_enter_casper() < 0)
710 err(1, "caph_enter_casper");
711
712 cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
713 if (caph_rights_limit(srecv, &rights) < 0)
714 err(1, "cap_rights_limit srecv");
715 cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT);
716 if (caph_rights_limit(ssend, &rights) < 0)
717 err(1, "cap_rights_limit ssend");
718
719 /* record route option */
720 if (options & F_RROUTE) {
721 #ifdef IP_OPTIONS
722 bzero(rspace, sizeof(rspace));
723 rspace[IPOPT_OPTVAL] = IPOPT_RR;
724 rspace[IPOPT_OLEN] = sizeof(rspace) - 1;
725 rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
726 rspace[sizeof(rspace) - 1] = IPOPT_EOL;
727 if (setsockopt(ssend, IPPROTO_IP, IP_OPTIONS, rspace,
728 sizeof(rspace)) < 0)
729 err(EX_OSERR, "setsockopt IP_OPTIONS");
730 #else
731 errx(EX_UNAVAILABLE,
732 "record route not available in this implementation");
733 #endif /* IP_OPTIONS */
734 }
735
736 if (options & F_TTL) {
737 if (setsockopt(ssend, IPPROTO_IP, IP_TTL, &ttl,
738 sizeof(ttl)) < 0) {
739 err(EX_OSERR, "setsockopt IP_TTL");
740 }
741 }
742 if (options & F_NOLOOP) {
743 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
744 sizeof(loop)) < 0) {
745 err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
746 }
747 }
748 if (options & F_MTTL) {
749 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_TTL, &mttl,
750 sizeof(mttl)) < 0) {
751 err(EX_OSERR, "setsockopt IP_MULTICAST_TTL");
752 }
753 }
754 if (options & F_MIF) {
755 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
756 sizeof(ifaddr)) < 0) {
757 err(EX_OSERR, "setsockopt IP_MULTICAST_IF");
758 }
759 }
760 #ifdef SO_TIMESTAMP
761 {
762 int on = 1;
763 int ts_clock = SO_TS_MONOTONIC;
764 if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on,
765 sizeof(on)) < 0)
766 err(EX_OSERR, "setsockopt SO_TIMESTAMP");
767 if (setsockopt(srecv, SOL_SOCKET, SO_TS_CLOCK, &ts_clock,
768 sizeof(ts_clock)) < 0)
769 err(EX_OSERR, "setsockopt SO_TS_CLOCK");
770 }
771 #endif
772 if (sweepmax) {
773 if (sweepmin > sweepmax)
774 errx(EX_USAGE,
775 "Maximum packet size must be no less than the minimum packet size");
776
777 if (sweepmax > maxpayload - TIMEVAL_LEN)
778 errx(EX_USAGE, "Invalid sweep maximum");
779
780 if (datalen != DEFDATALEN)
781 errx(EX_USAGE,
782 "Packet size and ping sweep are mutually exclusive");
783
784 if (npackets > 0) {
785 snpackets = npackets;
786 npackets = 0;
787 } else
788 snpackets = 1;
789 datalen = sweepmin;
790 send_len = icmp_len + sweepmin;
791 }
792 if (options & F_SWEEP && !sweepmax)
793 errx(EX_USAGE, "Maximum sweep size must be specified");
794
795 /*
796 * When pinging the broadcast address, you can get a lot of answers.
797 * Doing something so evil is useful if you are trying to stress the
798 * ethernet, or just want to fill the arp cache to get some stuff for
799 * /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast
800 * or multicast pings if they wish.
801 */
802
803 /*
804 * XXX receive buffer needs undetermined space for mbuf overhead
805 * as well.
806 */
807 hold = IP_MAXPACKET + 128;
808 (void)setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
809 sizeof(hold));
810 /* CAP_SETSOCKOPT removed */
811 cap_rights_init(&rights, CAP_RECV, CAP_EVENT);
812 if (caph_rights_limit(srecv, &rights) < 0)
813 err(1, "cap_rights_limit srecv setsockopt");
814 if (uid == 0)
815 (void)setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
816 sizeof(hold));
817 /* CAP_SETSOCKOPT removed */
818 cap_rights_init(&rights, CAP_SEND);
819 if (caph_rights_limit(ssend, &rights) < 0)
820 err(1, "cap_rights_limit ssend setsockopt");
821
822 if (to->sin_family == AF_INET) {
823 (void)printf("PING %s (%s)", hostname,
824 inet_ntoa(to->sin_addr));
825 if (source)
826 (void)printf(" from %s", shostname);
827 if (sweepmax)
828 (void)printf(": (%d ... %d) data bytes\n",
829 sweepmin, sweepmax);
830 else
831 (void)printf(": %d data bytes\n", datalen);
832
833 } else {
834 if (sweepmax)
835 (void)printf("PING %s: (%d ... %d) data bytes\n",
836 hostname, sweepmin, sweepmax);
837 else
838 (void)printf("PING %s: %d data bytes\n", hostname, datalen);
839 }
840
841 /*
842 * Use sigaction() instead of signal() to get unambiguous semantics,
843 * in particular with SA_RESTART not set.
844 */
845
846 sigemptyset(&si_sa.sa_mask);
847 si_sa.sa_flags = 0;
848 si_sa.sa_handler = onsignal;
849 if (sigaction(SIGINT, &si_sa, 0) == -1)
850 err(EX_OSERR, "sigaction SIGINT");
851 seenint = 0;
852 if (sigaction(SIGINFO, &si_sa, 0) == -1)
853 err(EX_OSERR, "sigaction SIGINFO");
854 seeninfo = 0;
855 if (alarmtimeout > 0) {
856 if (sigaction(SIGALRM, &si_sa, 0) == -1)
857 err(EX_OSERR, "sigaction SIGALRM");
858 }
859
860 bzero(&msg, sizeof(msg));
861 msg.msg_name = (caddr_t)&from;
862 msg.msg_iov = &iov;
863 msg.msg_iovlen = 1;
864 #ifdef SO_TIMESTAMP
865 msg.msg_control = (caddr_t)ctrl;
866 msg.msg_controllen = sizeof(ctrl);
867 #endif
868 iov.iov_base = packet;
869 iov.iov_len = IP_MAXPACKET;
870
871 if (preload == 0)
872 pinger(); /* send the first ping */
873 else {
874 if (npackets != 0 && preload > npackets)
875 preload = npackets;
876 while (preload--) /* fire off them quickies */
877 pinger();
878 }
879 (void)clock_gettime(CLOCK_MONOTONIC, &last);
880
881 if (options & F_FLOOD) {
882 intvl.tv_sec = 0;
883 intvl.tv_nsec = 10000000;
884 } else {
885 intvl.tv_sec = interval / 1000;
886 intvl.tv_nsec = interval % 1000 * 1000000;
887 }
888
889 almost_done = 0;
890 while (seenint == 0) {
891 struct timespec now, timeout;
892 fd_set rfds;
893 int n;
894 ssize_t cc;
895
896 /* signal handling */
897 if (seeninfo) {
898 pr_summary(stderr);
899 seeninfo = 0;
900 continue;
901 }
902 if ((unsigned)srecv >= FD_SETSIZE)
903 errx(EX_OSERR, "descriptor too large");
904 FD_ZERO(&rfds);
905 FD_SET(srecv, &rfds);
906 (void)clock_gettime(CLOCK_MONOTONIC, &now);
907 timespecadd(&last, &intvl, &timeout);
908 timespecsub(&timeout, &now, &timeout);
909 if (timeout.tv_sec < 0)
910 timespecclear(&timeout);
911
912 n = pselect(srecv + 1, &rfds, NULL, NULL, &timeout, NULL);
913 if (n < 0)
914 continue; /* EINTR */
915 if (n == 1) {
916 struct timespec *tv = NULL;
917 #ifdef SO_TIMESTAMP
918 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
919 #endif
920 msg.msg_namelen = sizeof(from);
921 if ((cc = recvmsg(srecv, &msg, 0)) < 0) {
922 if (errno == EINTR)
923 continue;
924 warn("recvmsg");
925 continue;
926 }
927 /* If we have a 0 byte read from recvfrom continue */
928 if (cc == 0)
929 continue;
930 #ifdef SO_TIMESTAMP
931 if (cmsg != NULL &&
932 cmsg->cmsg_level == SOL_SOCKET &&
933 cmsg->cmsg_type == SCM_TIMESTAMP &&
934 cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
935 /* Copy to avoid alignment problems: */
936 memcpy(&now, CMSG_DATA(cmsg), sizeof(now));
937 tv = &now;
938 }
939 #endif
940 if (tv == NULL) {
941 (void)clock_gettime(CLOCK_MONOTONIC, &now);
942 tv = &now;
943 }
944 pr_pack((char *)packet, cc, &from, tv);
945 if ((options & F_ONCE && nreceived) ||
946 (npackets && nreceived >= npackets))
947 break;
948 }
949 if (n == 0 || (options & F_FLOOD)) {
950 if (sweepmax && sntransmitted == snpackets) {
951 if (datalen + sweepincr > sweepmax)
952 break;
953 for (i = 0; i < sweepincr; i++)
954 *datap++ = i;
955 datalen += sweepincr;
956 send_len = icmp_len + datalen;
957 sntransmitted = 0;
958 }
959 if (!npackets || ntransmitted < npackets)
960 pinger();
961 else {
962 if (almost_done)
963 break;
964 almost_done = 1;
965 /*
966 * If we're not transmitting any more packets,
967 * change the timer to wait two round-trip times
968 * if we've received any packets or (waittime)
969 * milliseconds if we haven't.
970 */
971 intvl.tv_nsec = 0;
972 if (nreceived) {
973 intvl.tv_sec = 2 * tmax / 1000;
974 if (intvl.tv_sec == 0)
975 intvl.tv_sec = 1;
976 } else {
977 intvl.tv_sec = waittime / 1000;
978 intvl.tv_nsec =
979 waittime % 1000 * 1000000;
980 }
981 }
982 (void)clock_gettime(CLOCK_MONOTONIC, &last);
983 if (ntransmitted - nreceived - 1 > nmissedmax) {
984 nmissedmax = ntransmitted - nreceived - 1;
985 if (options & F_MISSED)
986 (void)write(STDOUT_FILENO, &BBELL, 1);
987 }
988 }
989 }
990 pr_summary(stdout);
991
992 exit(nreceived ? 0 : 2);
993 }
994
995 /*
996 * pinger --
997 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet
998 * will be added on by the kernel. The ID field is our UNIX process ID,
999 * and the sequence number is an ascending integer. The first TIMEVAL_LEN
1000 * bytes of the data portion are used to hold a UNIX "timespec" struct in
1001 * host byte-order, to compute the round-trip time.
1002 */
1003 static void
pinger(void)1004 pinger(void)
1005 {
1006 struct timespec now;
1007 struct tv32 tv32;
1008 struct icmp icp;
1009 int cc, i;
1010 u_char *packet;
1011
1012 packet = outpack;
1013 memcpy(&icp, outpack, ICMP_MINLEN + phdr_len);
1014 icp.icmp_type = icmp_type;
1015 icp.icmp_code = 0;
1016 icp.icmp_cksum = 0;
1017 icp.icmp_seq = htons(ntransmitted);
1018 icp.icmp_id = ident; /* ID */
1019
1020 CLR(ntransmitted % mx_dup_ck);
1021
1022 if ((options & F_TIME) || timing) {
1023 (void)clock_gettime(CLOCK_MONOTONIC, &now);
1024 /*
1025 * Truncate seconds down to 32 bits in order
1026 * to fit the timestamp within 8 bytes of the
1027 * packet. We're only concerned with
1028 * durations, not absolute times.
1029 */
1030 tv32.tv32_sec = (uint32_t)htonl(now.tv_sec);
1031 tv32.tv32_nsec = (uint32_t)htonl(now.tv_nsec);
1032 if (options & F_TIME) {
1033 /*
1034 * However, per RFC 792 the Originate Timestamp (otime)
1035 * should be milliseconds since midnight UTC. Something,
1036 * that CLOCK_MONOTONIC does not guarantee.
1037 */
1038 (void)clock_gettime(CLOCK_REALTIME, &now);
1039 icp.icmp_otime = htonl((now.tv_sec % (24*60*60))
1040 * 1000 + now.tv_nsec / 1000000);
1041 }
1042 if (timing)
1043 bcopy((void *)&tv32,
1044 (void *)&outpack[ICMP_MINLEN + phdr_len],
1045 sizeof(tv32));
1046 }
1047
1048 memcpy(outpack, &icp, ICMP_MINLEN + phdr_len);
1049
1050 cc = ICMP_MINLEN + phdr_len + datalen;
1051
1052 /* compute ICMP checksum here */
1053 icp.icmp_cksum = in_cksum(outpack, cc);
1054 /* Update icmp_cksum in the raw packet data buffer. */
1055 memcpy(outpack + offsetof(struct icmp, icmp_cksum), &icp.icmp_cksum,
1056 sizeof(icp.icmp_cksum));
1057
1058 if (options & F_HDRINCL) {
1059 struct ip ip;
1060
1061 cc += sizeof(struct ip);
1062 ip.ip_len = htons(cc);
1063 /* Update ip_len in the raw packet data buffer. */
1064 memcpy(outpackhdr + offsetof(struct ip, ip_len), &ip.ip_len,
1065 sizeof(ip.ip_len));
1066 ip.ip_sum = in_cksum(outpackhdr, cc);
1067 /* Update ip_sum in the raw packet data buffer. */
1068 memcpy(outpackhdr + offsetof(struct ip, ip_sum), &ip.ip_sum,
1069 sizeof(ip.ip_sum));
1070 packet = outpackhdr;
1071 }
1072 i = send(ssend, (char *)packet, cc, 0);
1073 if (i < 0 || i != cc) {
1074 if (i < 0) {
1075 if (options & F_FLOOD && errno == ENOBUFS) {
1076 usleep(FLOOD_BACKOFF);
1077 return;
1078 }
1079 warn("sendto");
1080 } else {
1081 warn("%s: partial write: %d of %d bytes",
1082 hostname, i, cc);
1083 }
1084 }
1085 ntransmitted++;
1086 sntransmitted++;
1087 if (!(options & F_QUIET) && options & F_DOT)
1088 (void)write(STDOUT_FILENO, &DOT[DOTidx++ % DOTlen], 1);
1089 }
1090
1091 /*
1092 * pr_pack --
1093 * Print out the packet, if it came from us. This logic is necessary
1094 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
1095 * which arrive ('tis only fair). This permits multiple copies of this
1096 * program to be run without having intermingled output (or statistics!).
1097 */
1098 static void
pr_pack(char * buf,ssize_t cc,struct sockaddr_in * from,struct timespec * tv)1099 pr_pack(char *buf, ssize_t cc, struct sockaddr_in *from, struct timespec *tv)
1100 {
1101 struct in_addr ina;
1102 u_char *cp, *dp, l;
1103 struct icmp icp;
1104 struct ip ip;
1105 const u_char *icmp_data_raw;
1106 ssize_t icmp_data_raw_len;
1107 double triptime;
1108 int dupflag, i, j, recv_len;
1109 int8_t hlen;
1110 uint16_t seq;
1111 static int old_rrlen;
1112 static char old_rr[MAX_IPOPTLEN];
1113 struct ip oip;
1114 u_char oip_header_len;
1115 struct icmp oicmp;
1116 const u_char *oicmp_raw;
1117
1118 /*
1119 * Get size of IP header of the received packet.
1120 * The header length is contained in the lower four bits of the first
1121 * byte and represents the number of 4 byte octets the header takes up.
1122 *
1123 * The IHL minimum value is 5 (20 bytes) and its maximum value is 15
1124 * (60 bytes).
1125 */
1126 memcpy(&l, buf, sizeof(l));
1127 hlen = (l & 0x0f) << 2;
1128
1129 /* Reject IP packets with a short header */
1130 if (hlen < (int8_t) sizeof(struct ip)) {
1131 if (options & F_VERBOSE)
1132 warn("IHL too short (%d bytes) from %s", hlen,
1133 inet_ntoa(from->sin_addr));
1134 return;
1135 }
1136
1137 memcpy(&ip, buf, sizeof(struct ip));
1138
1139 /* Check packet has enough data to carry a valid ICMP header */
1140 recv_len = cc;
1141 if (cc < hlen + ICMP_MINLEN) {
1142 if (options & F_VERBOSE)
1143 warn("packet too short (%zd bytes) from %s", cc,
1144 inet_ntoa(from->sin_addr));
1145 return;
1146 }
1147
1148 icmp_data_raw_len = cc - (hlen + offsetof(struct icmp, icmp_data));
1149 icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_data);
1150
1151 /* Now the ICMP part */
1152 cc -= hlen;
1153 memcpy(&icp, buf + hlen, MIN((ssize_t)sizeof(icp), cc));
1154 if (icp.icmp_type == icmp_type_rsp) {
1155 if (icp.icmp_id != ident)
1156 return; /* 'Twas not our ECHO */
1157 ++nreceived;
1158 triptime = 0.0;
1159 if (timing) {
1160 struct timespec tv1;
1161 struct tv32 tv32;
1162 const u_char *tp;
1163
1164 tp = icmp_data_raw + phdr_len;
1165
1166 if ((size_t)(cc - ICMP_MINLEN - phdr_len) >=
1167 sizeof(tv1)) {
1168 /* Copy to avoid alignment problems: */
1169 memcpy(&tv32, tp, sizeof(tv32));
1170 tv1.tv_sec = ntohl(tv32.tv32_sec);
1171 tv1.tv_nsec = ntohl(tv32.tv32_nsec);
1172 timespecsub(tv, &tv1, tv);
1173 triptime = ((double)tv->tv_sec) * 1000.0 +
1174 ((double)tv->tv_nsec) / 1000000.0;
1175 if (triptime < 0) {
1176 warnx("time of day goes back (%.3f ms),"
1177 " clamping time to 0",
1178 triptime);
1179 triptime = 0;
1180 }
1181 tsum += triptime;
1182 tsumsq += triptime * triptime;
1183 if (triptime < tmin)
1184 tmin = triptime;
1185 if (triptime > tmax)
1186 tmax = triptime;
1187 } else
1188 timing = 0;
1189 }
1190
1191 seq = ntohs(icp.icmp_seq);
1192
1193 if (TST(seq % mx_dup_ck)) {
1194 ++nrepeats;
1195 --nreceived;
1196 dupflag = 1;
1197 } else {
1198 SET(seq % mx_dup_ck);
1199 dupflag = 0;
1200 }
1201
1202 if (options & F_QUIET)
1203 return;
1204
1205 if (options & F_WAITTIME && triptime > waittime) {
1206 ++nrcvtimeout;
1207 return;
1208 }
1209
1210 if (options & F_DOT)
1211 (void)write(STDOUT_FILENO, &BSPACE, 1);
1212 else {
1213 (void)printf("%zd bytes from %s: icmp_seq=%u", cc,
1214 pr_addr(from->sin_addr), seq);
1215 (void)printf(" ttl=%d", ip.ip_ttl);
1216 if (timing)
1217 (void)printf(" time=%.3f ms", triptime);
1218 if (dupflag)
1219 (void)printf(" (DUP!)");
1220 if (options & F_AUDIBLE)
1221 (void)write(STDOUT_FILENO, &BBELL, 1);
1222 if (options & F_MASK) {
1223 /* Just prentend this cast isn't ugly */
1224 (void)printf(" mask=%s",
1225 inet_ntoa(*(struct in_addr *)&(icp.icmp_mask)));
1226 }
1227 if (options & F_TIME) {
1228 (void)printf(" tso=%s", pr_ntime(icp.icmp_otime));
1229 (void)printf(" tsr=%s", pr_ntime(icp.icmp_rtime));
1230 (void)printf(" tst=%s", pr_ntime(icp.icmp_ttime));
1231 }
1232 if (recv_len != send_len) {
1233 (void)printf(
1234 "\nwrong total length %d instead of %d",
1235 recv_len, send_len);
1236 }
1237 /* check the data */
1238 cp = (u_char*)(buf + hlen + offsetof(struct icmp,
1239 icmp_data) + phdr_len);
1240 dp = &outpack[ICMP_MINLEN + phdr_len];
1241 cc -= ICMP_MINLEN + phdr_len;
1242 i = 0;
1243 if (timing) { /* don't check variable timestamp */
1244 cp += TIMEVAL_LEN;
1245 dp += TIMEVAL_LEN;
1246 cc -= TIMEVAL_LEN;
1247 i += TIMEVAL_LEN;
1248 }
1249 for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) {
1250 if (*cp != *dp) {
1251 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
1252 i, *dp, *cp);
1253 (void)printf("\ncp:");
1254 cp = (u_char*)(buf + hlen +
1255 offsetof(struct icmp, icmp_data));
1256 for (i = 0; i < datalen; ++i, ++cp) {
1257 if ((i % 16) == 8)
1258 (void)printf("\n\t");
1259 (void)printf(" %2x", *cp);
1260 }
1261 (void)printf("\ndp:");
1262 cp = &outpack[ICMP_MINLEN];
1263 for (i = 0; i < datalen; ++i, ++cp) {
1264 if ((i % 16) == 8)
1265 (void)printf("\n\t");
1266 (void)printf(" %2x", *cp);
1267 }
1268 break;
1269 }
1270 }
1271 }
1272 } else {
1273 /*
1274 * We've got something other than an ECHOREPLY.
1275 * See if it's a reply to something that we sent.
1276 * We can compare IP destination, protocol,
1277 * and ICMP type and ID.
1278 *
1279 * Only print all the error messages if we are running
1280 * as root to avoid leaking information not normally
1281 * available to those not running as root.
1282 */
1283
1284 /*
1285 * If we don't have enough bytes for a quoted IP header and an
1286 * ICMP header then stop.
1287 */
1288 if (icmp_data_raw_len <
1289 (ssize_t)(sizeof(struct ip) + sizeof(struct icmp))) {
1290 if (options & F_VERBOSE)
1291 warnx("quoted data too short (%zd bytes) from %s",
1292 icmp_data_raw_len, inet_ntoa(from->sin_addr));
1293 return;
1294 }
1295
1296 memcpy(&oip_header_len, icmp_data_raw, sizeof(oip_header_len));
1297 oip_header_len = (oip_header_len & 0x0f) << 2;
1298
1299 /* Reject IP packets with a short header */
1300 if (oip_header_len < sizeof(struct ip)) {
1301 if (options & F_VERBOSE)
1302 warnx("inner IHL too short (%d bytes) from %s",
1303 oip_header_len, inet_ntoa(from->sin_addr));
1304 return;
1305 }
1306
1307 /*
1308 * Check against the actual IHL length, to protect against
1309 * quoated packets carrying IP options.
1310 */
1311 if (icmp_data_raw_len <
1312 (ssize_t)(oip_header_len + sizeof(struct icmp))) {
1313 if (options & F_VERBOSE)
1314 warnx("inner packet too short (%zd bytes) from %s",
1315 icmp_data_raw_len, inet_ntoa(from->sin_addr));
1316 return;
1317 }
1318
1319 memcpy(&oip, icmp_data_raw, sizeof(struct ip));
1320 oicmp_raw = icmp_data_raw + oip_header_len;
1321 memcpy(&oicmp, oicmp_raw, sizeof(struct icmp));
1322
1323 if (((options & F_VERBOSE) && uid == 0) ||
1324 (!(options & F_QUIET2) &&
1325 (oip.ip_dst.s_addr == whereto.sin_addr.s_addr) &&
1326 (oip.ip_p == IPPROTO_ICMP) &&
1327 (oicmp.icmp_type == ICMP_ECHO) &&
1328 (oicmp.icmp_id == ident))) {
1329 (void)printf("%zd bytes from %s: ", cc,
1330 pr_addr(from->sin_addr));
1331 pr_icmph(&icp, &oip, icmp_data_raw);
1332 } else
1333 return;
1334 }
1335
1336 /* Display any IP options */
1337 cp = (u_char *)buf + sizeof(struct ip);
1338
1339 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
1340 switch (*cp) {
1341 case IPOPT_EOL:
1342 hlen = 0;
1343 break;
1344 case IPOPT_LSRR:
1345 case IPOPT_SSRR:
1346 (void)printf(*cp == IPOPT_LSRR ?
1347 "\nLSRR: " : "\nSSRR: ");
1348 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1;
1349 hlen -= 2;
1350 cp += 2;
1351 if (j >= INADDR_LEN &&
1352 j <= hlen - (int)sizeof(struct ip)) {
1353 for (;;) {
1354 bcopy(++cp, &ina.s_addr, INADDR_LEN);
1355 if (ina.s_addr == 0)
1356 (void)printf("\t0.0.0.0");
1357 else
1358 (void)printf("\t%s",
1359 pr_addr(ina));
1360 hlen -= INADDR_LEN;
1361 cp += INADDR_LEN - 1;
1362 j -= INADDR_LEN;
1363 if (j < INADDR_LEN)
1364 break;
1365 (void)putchar('\n');
1366 }
1367 } else
1368 (void)printf("\t(truncated route)");
1369 break;
1370 case IPOPT_RR:
1371 j = cp[IPOPT_OLEN]; /* get length */
1372 i = cp[IPOPT_OFFSET]; /* and pointer */
1373 hlen -= 2;
1374 cp += 2;
1375 if (i > j)
1376 i = j;
1377 i = i - IPOPT_MINOFF + 1;
1378 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) {
1379 old_rrlen = 0;
1380 continue;
1381 }
1382 if (i == old_rrlen
1383 && !bcmp((char *)cp, old_rr, i)
1384 && !(options & F_DOT)) {
1385 (void)printf("\t(same route)");
1386 hlen -= i;
1387 cp += i;
1388 break;
1389 }
1390 old_rrlen = i;
1391 bcopy((char *)cp, old_rr, i);
1392 (void)printf("\nRR: ");
1393 if (i >= INADDR_LEN &&
1394 i <= hlen - (int)sizeof(struct ip)) {
1395 for (;;) {
1396 bcopy(++cp, &ina.s_addr, INADDR_LEN);
1397 if (ina.s_addr == 0)
1398 (void)printf("\t0.0.0.0");
1399 else
1400 (void)printf("\t%s",
1401 pr_addr(ina));
1402 hlen -= INADDR_LEN;
1403 cp += INADDR_LEN - 1;
1404 i -= INADDR_LEN;
1405 if (i < INADDR_LEN)
1406 break;
1407 (void)putchar('\n');
1408 }
1409 } else
1410 (void)printf("\t(truncated route)");
1411 break;
1412 case IPOPT_NOP:
1413 (void)printf("\nNOP");
1414 break;
1415 default:
1416 (void)printf("\nunknown option %x", *cp);
1417 break;
1418 }
1419 if (!(options & F_DOT)) {
1420 (void)putchar('\n');
1421 (void)fflush(stdout);
1422 }
1423 }
1424
1425 /*
1426 * pr_icmph --
1427 * Print a descriptive string about an ICMP header.
1428 */
1429 static void
pr_icmph(struct icmp * icp,struct ip * oip,const u_char * const oicmp_raw)1430 pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw)
1431 {
1432
1433 switch(icp->icmp_type) {
1434 case ICMP_ECHOREPLY:
1435 (void)printf("Echo Reply\n");
1436 /* XXX ID + Seq + Data */
1437 break;
1438 case ICMP_UNREACH:
1439 switch(icp->icmp_code) {
1440 case ICMP_UNREACH_NET:
1441 (void)printf("Destination Net Unreachable\n");
1442 break;
1443 case ICMP_UNREACH_HOST:
1444 (void)printf("Destination Host Unreachable\n");
1445 break;
1446 case ICMP_UNREACH_PROTOCOL:
1447 (void)printf("Destination Protocol Unreachable\n");
1448 break;
1449 case ICMP_UNREACH_PORT:
1450 (void)printf("Destination Port Unreachable\n");
1451 break;
1452 case ICMP_UNREACH_NEEDFRAG:
1453 (void)printf("frag needed and DF set (MTU %d)\n",
1454 ntohs(icp->icmp_nextmtu));
1455 break;
1456 case ICMP_UNREACH_SRCFAIL:
1457 (void)printf("Source Route Failed\n");
1458 break;
1459 case ICMP_UNREACH_FILTER_PROHIB:
1460 (void)printf("Communication prohibited by filter\n");
1461 break;
1462 default:
1463 (void)printf("Dest Unreachable, Bad Code: %d\n",
1464 icp->icmp_code);
1465 break;
1466 }
1467 /* Print returned IP header information */
1468 pr_iph(oip, oicmp_raw);
1469 break;
1470 case ICMP_SOURCEQUENCH:
1471 (void)printf("Source Quench\n");
1472 pr_iph(oip, oicmp_raw);
1473 break;
1474 case ICMP_REDIRECT:
1475 switch(icp->icmp_code) {
1476 case ICMP_REDIRECT_NET:
1477 (void)printf("Redirect Network");
1478 break;
1479 case ICMP_REDIRECT_HOST:
1480 (void)printf("Redirect Host");
1481 break;
1482 case ICMP_REDIRECT_TOSNET:
1483 (void)printf("Redirect Type of Service and Network");
1484 break;
1485 case ICMP_REDIRECT_TOSHOST:
1486 (void)printf("Redirect Type of Service and Host");
1487 break;
1488 default:
1489 (void)printf("Redirect, Bad Code: %d", icp->icmp_code);
1490 break;
1491 }
1492 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
1493 pr_iph(oip, oicmp_raw);
1494 break;
1495 case ICMP_ECHO:
1496 (void)printf("Echo Request\n");
1497 /* XXX ID + Seq + Data */
1498 break;
1499 case ICMP_TIMXCEED:
1500 switch(icp->icmp_code) {
1501 case ICMP_TIMXCEED_INTRANS:
1502 (void)printf("Time to live exceeded\n");
1503 break;
1504 case ICMP_TIMXCEED_REASS:
1505 (void)printf("Frag reassembly time exceeded\n");
1506 break;
1507 default:
1508 (void)printf("Time exceeded, Bad Code: %d\n",
1509 icp->icmp_code);
1510 break;
1511 }
1512 pr_iph(oip, oicmp_raw);
1513 break;
1514 case ICMP_PARAMPROB:
1515 (void)printf("Parameter problem: pointer = 0x%02x\n",
1516 icp->icmp_hun.ih_pptr);
1517 pr_iph(oip, oicmp_raw);
1518 break;
1519 case ICMP_TSTAMP:
1520 (void)printf("Timestamp\n");
1521 /* XXX ID + Seq + 3 timestamps */
1522 break;
1523 case ICMP_TSTAMPREPLY:
1524 (void)printf("Timestamp Reply\n");
1525 /* XXX ID + Seq + 3 timestamps */
1526 break;
1527 case ICMP_IREQ:
1528 (void)printf("Information Request\n");
1529 /* XXX ID + Seq */
1530 break;
1531 case ICMP_IREQREPLY:
1532 (void)printf("Information Reply\n");
1533 /* XXX ID + Seq */
1534 break;
1535 case ICMP_MASKREQ:
1536 (void)printf("Address Mask Request\n");
1537 break;
1538 case ICMP_MASKREPLY:
1539 (void)printf("Address Mask Reply\n");
1540 break;
1541 case ICMP_ROUTERADVERT:
1542 (void)printf("Router Advertisement\n");
1543 break;
1544 case ICMP_ROUTERSOLICIT:
1545 (void)printf("Router Solicitation\n");
1546 break;
1547 default:
1548 (void)printf("Bad ICMP type: %d\n", icp->icmp_type);
1549 }
1550 }
1551
1552 /*
1553 * pr_iph --
1554 * Print an IP header with options.
1555 */
1556 static void
pr_iph(struct ip * ip,const u_char * cp)1557 pr_iph(struct ip *ip, const u_char *cp)
1558 {
1559 struct in_addr dst_ina, src_ina;
1560 int hlen;
1561
1562 hlen = ip->ip_hl << 2;
1563 cp = cp + sizeof(struct ip); /* point to options */
1564
1565 memcpy(&src_ina, &ip->ip_src.s_addr, sizeof(src_ina));
1566 memcpy(&dst_ina, &ip->ip_dst.s_addr, sizeof(dst_ina));
1567
1568 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks %*s %*s",
1569 (int)strlen(inet_ntoa(src_ina)), "Src",
1570 (int)strlen(inet_ntoa(dst_ina)), "Dst");
1571 if (hlen > (int)sizeof(struct ip))
1572 (void)printf(" Opts");
1573 (void)putchar('\n');
1574 (void)printf(" %1x %1x %02x %04x %04x",
1575 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
1576 ntohs(ip->ip_id));
1577 (void)printf(" %1x %04x",
1578 (ntohs(ip->ip_off) & 0xe000) >> 13,
1579 ntohs(ip->ip_off) & 0x1fff);
1580 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p,
1581 ntohs(ip->ip_sum));
1582 (void)printf(" %s", inet_ntoa(src_ina));
1583 (void)printf(" %s", inet_ntoa(dst_ina));
1584 /* dump any option bytes */
1585 if (hlen > (int)sizeof(struct ip)) {
1586 (void)printf(" ");
1587 while (hlen-- > (int)sizeof(struct ip)) {
1588 (void)printf("%02x", *cp++);
1589 }
1590 }
1591 (void)putchar('\n');
1592 }
1593
1594 /*
1595 * pr_addr --
1596 * Return an ascii host address as a dotted quad and optionally with
1597 * a hostname.
1598 */
1599 static char *
pr_addr(struct in_addr ina)1600 pr_addr(struct in_addr ina)
1601 {
1602 struct hostent *hp;
1603 static char buf[16 + 3 + MAXHOSTNAMELEN];
1604
1605 if (!(options & F_HOSTNAME))
1606 return inet_ntoa(ina);
1607
1608 hp = cap_gethostbyaddr(capdns, (char *)&ina, sizeof(ina), AF_INET);
1609
1610 if (hp == NULL)
1611 return inet_ntoa(ina);
1612
1613 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
1614 inet_ntoa(ina));
1615 return(buf);
1616 }
1617
1618 static char *
pr_ntime(n_time timestamp)1619 pr_ntime(n_time timestamp)
1620 {
1621 static char buf[11];
1622 int hour, min, sec;
1623
1624 sec = ntohl(timestamp) / 1000;
1625 hour = sec / 60 / 60;
1626 min = (sec % (60 * 60)) / 60;
1627 sec = (sec % (60 * 60)) % 60;
1628
1629 (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec);
1630
1631 return (buf);
1632 }
1633
1634 static void
fill(char * bp,char * patp)1635 fill(char *bp, char *patp)
1636 {
1637 char *cp;
1638 int pat[16];
1639 u_int ii, jj, kk;
1640
1641 for (cp = patp; *cp; cp++) {
1642 if (!isxdigit(*cp))
1643 errx(EX_USAGE,
1644 "patterns must be specified as hex digits");
1645
1646 }
1647 ii = sscanf(patp,
1648 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
1649 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
1650 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
1651 &pat[13], &pat[14], &pat[15]);
1652
1653 if (ii > 0)
1654 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii)
1655 for (jj = 0; jj < ii; ++jj)
1656 bp[jj + kk] = pat[jj];
1657 if (!(options & F_QUIET)) {
1658 (void)printf("PATTERN: 0x");
1659 for (jj = 0; jj < ii; ++jj)
1660 (void)printf("%02x", bp[jj] & 0xFF);
1661 (void)printf("\n");
1662 }
1663 }
1664
1665 static cap_channel_t *
capdns_setup(void)1666 capdns_setup(void)
1667 {
1668 cap_channel_t *capcas, *capdnsloc;
1669 #ifdef WITH_CASPER
1670 const char *types[2];
1671 int families[1];
1672 #endif
1673 capcas = cap_init();
1674 if (capcas == NULL)
1675 err(1, "unable to create casper process");
1676 capdnsloc = cap_service_open(capcas, "system.dns");
1677 /* Casper capability no longer needed. */
1678 cap_close(capcas);
1679 if (capdnsloc == NULL)
1680 err(1, "unable to open system.dns service");
1681 #ifdef WITH_CASPER
1682 types[0] = "NAME2ADDR";
1683 types[1] = "ADDR2NAME";
1684 if (cap_dns_type_limit(capdnsloc, types, 2) < 0)
1685 err(1, "unable to limit access to system.dns service");
1686 families[0] = AF_INET;
1687 if (cap_dns_family_limit(capdnsloc, families, 1) < 0)
1688 err(1, "unable to limit access to system.dns service");
1689 #endif
1690 return (capdnsloc);
1691 }
1692