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 111struct 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) 152static int mx_dup_ck = MAX_DUP_CHK; 153static char rcvd_tbl[MAX_DUP_CHK / 8]; 154 155static struct sockaddr_in whereto; /* who to ping */ 156static int datalen = DEFDATALEN; 157static int maxpayload; 158static int ssend; /* send socket file descriptor */ 159static int srecv; /* receive socket file descriptor */ 160static u_char outpackhdr[IP_MAXPACKET], *outpack; 161static char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */ 162static char BSPACE = '\b'; /* characters written for flood */ 163static const char *DOT = "."; 164static size_t DOTlen = 1; 165static size_t DOTidx = 0; 166static char *shostname; 167static int ident; /* process id to identify our packets */ 168static int uid; /* cached uid for micro-optimization */ 169static u_char icmp_type = ICMP_ECHO; 170static u_char icmp_type_rsp = ICMP_ECHOREPLY; 171static int phdr_len = 0; 172static int send_len; 173 174/* counters */ 175static long nmissedmax; /* max value of ntransmitted - nreceived - 1 */ 176static long npackets; /* max packets to transmit */ 177static long snpackets; /* max packets to transmit in one sweep */ 178static long sntransmitted; /* # of packets we sent in this sweep */ 179static int sweepmax; /* max value of payload in sweep */ 180static int sweepmin = 0; /* start value of payload in sweep */ 181static int sweepincr = 1; /* payload increment in sweep */ 182static int interval = 1000; /* interval between packets, ms */ 183static int waittime = MAXWAIT; /* timeout for each packet */ 184 185static cap_channel_t *capdns; 186 187static void fill(char *, char *); 188static cap_channel_t *capdns_setup(void); 189static void pinger(void); 190static char *pr_addr(struct in_addr); 191static char *pr_ntime(n_time); 192static void pr_icmph(struct icmp *, struct ip *, const u_char *const); 193static void pr_iph(struct ip *, const u_char *); 194static void pr_pack(char *, ssize_t, struct sockaddr_in *, struct timespec *); 195 196int 197ping(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 packet size for ping sweep */ 317 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 318 if (errstr != NULL) { 319 errx(EX_USAGE, "invalid packet size: `%s'", 320 optarg); 321 } 322 sweepmax = (int)ltmp; 323 if (uid != 0 && sweepmax > DEFDATALEN) { 324 errc(EX_NOPERM, EPERM, 325 "packet size too large: %d > %u", 326 sweepmax, DEFDATALEN); 327 } 328 options |= F_SWEEP; 329 break; 330 case 'g': /* Minimum packet size for ping sweep */ 331 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 332 if (errstr != NULL) { 333 errx(EX_USAGE, "invalid packet size: `%s'", 334 optarg); 335 } 336 sweepmin = (int)ltmp; 337 if (uid != 0 && sweepmin > DEFDATALEN) { 338 errc(EX_NOPERM, EPERM, 339 "packet 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': /* Packet size increment for ping sweep */ 348 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 349 if (errstr != NULL) { 350 errx(EX_USAGE, "invalid packet size: `%s'", 351 optarg); 352 } 353 sweepincr = (int)ltmp; 354 if (uid != 0 && sweepincr > DEFDATALEN) { 355 errc(EX_NOPERM, EPERM, 356 "packet 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 */ 1003static void 1004pinger(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 icp.icmp_otime = htonl((now.tv_sec % (24*60*60)) 1034 * 1000 + now.tv_nsec / 1000000); 1035 if (timing) 1036 bcopy((void *)&tv32, 1037 (void *)&outpack[ICMP_MINLEN + phdr_len], 1038 sizeof(tv32)); 1039 } 1040 1041 memcpy(outpack, &icp, ICMP_MINLEN + phdr_len); 1042 1043 cc = ICMP_MINLEN + phdr_len + datalen; 1044 1045 /* compute ICMP checksum here */ 1046 icp.icmp_cksum = in_cksum(outpack, cc); 1047 /* Update icmp_cksum in the raw packet data buffer. */ 1048 memcpy(outpack + offsetof(struct icmp, icmp_cksum), &icp.icmp_cksum, 1049 sizeof(icp.icmp_cksum)); 1050 1051 if (options & F_HDRINCL) { 1052 struct ip ip; 1053 1054 cc += sizeof(struct ip); 1055 ip.ip_len = htons(cc); 1056 /* Update ip_len in the raw packet data buffer. */ 1057 memcpy(outpackhdr + offsetof(struct ip, ip_len), &ip.ip_len, 1058 sizeof(ip.ip_len)); 1059 ip.ip_sum = in_cksum(outpackhdr, cc); 1060 /* Update ip_sum in the raw packet data buffer. */ 1061 memcpy(outpackhdr + offsetof(struct ip, ip_sum), &ip.ip_sum, 1062 sizeof(ip.ip_sum)); 1063 packet = outpackhdr; 1064 } 1065 i = send(ssend, (char *)packet, cc, 0); 1066 if (i < 0 || i != cc) { 1067 if (i < 0) { 1068 if (options & F_FLOOD && errno == ENOBUFS) { 1069 usleep(FLOOD_BACKOFF); 1070 return; 1071 } 1072 warn("sendto"); 1073 } else { 1074 warn("%s: partial write: %d of %d bytes", 1075 hostname, i, cc); 1076 } 1077 } 1078 ntransmitted++; 1079 sntransmitted++; 1080 if (!(options & F_QUIET) && options & F_DOT) 1081 (void)write(STDOUT_FILENO, &DOT[DOTidx++ % DOTlen], 1); 1082} 1083 1084/* 1085 * pr_pack -- 1086 * Print out the packet, if it came from us. This logic is necessary 1087 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets 1088 * which arrive ('tis only fair). This permits multiple copies of this 1089 * program to be run without having intermingled output (or statistics!). 1090 */ 1091static void 1092pr_pack(char *buf, ssize_t cc, struct sockaddr_in *from, struct timespec *tv) 1093{ 1094 struct in_addr ina; 1095 u_char *cp, *dp, l; 1096 struct icmp icp; 1097 struct ip ip; 1098 const u_char *icmp_data_raw; 1099 ssize_t icmp_data_raw_len; 1100 double triptime; 1101 int dupflag, i, j, recv_len; 1102 int8_t hlen; 1103 uint16_t seq; 1104 static int old_rrlen; 1105 static char old_rr[MAX_IPOPTLEN]; 1106 struct ip oip; 1107 u_char oip_header_len; 1108 struct icmp oicmp; 1109 const u_char *oicmp_raw; 1110 1111 /* 1112 * Get size of IP header of the received packet. 1113 * The header length is contained in the lower four bits of the first 1114 * byte and represents the number of 4 byte octets the header takes up. 1115 * 1116 * The IHL minimum value is 5 (20 bytes) and its maximum value is 15 1117 * (60 bytes). 1118 */ 1119 memcpy(&l, buf, sizeof(l)); 1120 hlen = (l & 0x0f) << 2; 1121 1122 /* Reject IP packets with a short header */ 1123 if (hlen < (int8_t) sizeof(struct ip)) { 1124 if (options & F_VERBOSE) 1125 warn("IHL too short (%d bytes) from %s", hlen, 1126 inet_ntoa(from->sin_addr)); 1127 return; 1128 } 1129 1130 memcpy(&ip, buf, sizeof(struct ip)); 1131 1132 /* Check packet has enough data to carry a valid ICMP header */ 1133 recv_len = cc; 1134 if (cc < hlen + ICMP_MINLEN) { 1135 if (options & F_VERBOSE) 1136 warn("packet too short (%zd bytes) from %s", cc, 1137 inet_ntoa(from->sin_addr)); 1138 return; 1139 } 1140 1141 icmp_data_raw_len = cc - (hlen + offsetof(struct icmp, icmp_data)); 1142 icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_data); 1143 1144 /* Now the ICMP part */ 1145 cc -= hlen; 1146 memcpy(&icp, buf + hlen, MIN((ssize_t)sizeof(icp), cc)); 1147 if (icp.icmp_type == icmp_type_rsp) { 1148 if (icp.icmp_id != ident) 1149 return; /* 'Twas not our ECHO */ 1150 ++nreceived; 1151 triptime = 0.0; 1152 if (timing) { 1153 struct timespec tv1; 1154 struct tv32 tv32; 1155 const u_char *tp; 1156 1157 tp = icmp_data_raw + phdr_len; 1158 1159 if ((size_t)(cc - ICMP_MINLEN - phdr_len) >= 1160 sizeof(tv1)) { 1161 /* Copy to avoid alignment problems: */ 1162 memcpy(&tv32, tp, sizeof(tv32)); 1163 tv1.tv_sec = ntohl(tv32.tv32_sec); 1164 tv1.tv_nsec = ntohl(tv32.tv32_nsec); 1165 timespecsub(tv, &tv1, tv); 1166 triptime = ((double)tv->tv_sec) * 1000.0 + 1167 ((double)tv->tv_nsec) / 1000000.0; 1168 if (triptime < 0) { 1169 warnx("time of day goes back (%.3f ms)," 1170 " clamping time to 0", 1171 triptime); 1172 triptime = 0; 1173 } 1174 tsum += triptime; 1175 tsumsq += triptime * triptime; 1176 if (triptime < tmin) 1177 tmin = triptime; 1178 if (triptime > tmax) 1179 tmax = triptime; 1180 } else 1181 timing = 0; 1182 } 1183 1184 seq = ntohs(icp.icmp_seq); 1185 1186 if (TST(seq % mx_dup_ck)) { 1187 ++nrepeats; 1188 --nreceived; 1189 dupflag = 1; 1190 } else { 1191 SET(seq % mx_dup_ck); 1192 dupflag = 0; 1193 } 1194 1195 if (options & F_QUIET) 1196 return; 1197 1198 if (options & F_WAITTIME && triptime > waittime) { 1199 ++nrcvtimeout; 1200 return; 1201 } 1202 1203 if (options & F_DOT) 1204 (void)write(STDOUT_FILENO, &BSPACE, 1); 1205 else { 1206 (void)printf("%zd bytes from %s: icmp_seq=%u", cc, 1207 pr_addr(from->sin_addr), seq); 1208 (void)printf(" ttl=%d", ip.ip_ttl); 1209 if (timing) 1210 (void)printf(" time=%.3f ms", triptime); 1211 if (dupflag) 1212 (void)printf(" (DUP!)"); 1213 if (options & F_AUDIBLE) 1214 (void)write(STDOUT_FILENO, &BBELL, 1); 1215 if (options & F_MASK) { 1216 /* Just prentend this cast isn't ugly */ 1217 (void)printf(" mask=%s", 1218 inet_ntoa(*(struct in_addr *)&(icp.icmp_mask))); 1219 } 1220 if (options & F_TIME) { 1221 (void)printf(" tso=%s", pr_ntime(icp.icmp_otime)); 1222 (void)printf(" tsr=%s", pr_ntime(icp.icmp_rtime)); 1223 (void)printf(" tst=%s", pr_ntime(icp.icmp_ttime)); 1224 } 1225 if (recv_len != send_len) { 1226 (void)printf( 1227 "\nwrong total length %d instead of %d", 1228 recv_len, send_len); 1229 } 1230 /* check the data */ 1231 cp = (u_char*)(buf + hlen + offsetof(struct icmp, 1232 icmp_data) + phdr_len); 1233 dp = &outpack[ICMP_MINLEN + phdr_len]; 1234 cc -= ICMP_MINLEN + phdr_len; 1235 i = 0; 1236 if (timing) { /* don't check variable timestamp */ 1237 cp += TIMEVAL_LEN; 1238 dp += TIMEVAL_LEN; 1239 cc -= TIMEVAL_LEN; 1240 i += TIMEVAL_LEN; 1241 } 1242 for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) { 1243 if (*cp != *dp) { 1244 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", 1245 i, *dp, *cp); 1246 (void)printf("\ncp:"); 1247 cp = (u_char*)(buf + hlen + 1248 offsetof(struct icmp, icmp_data)); 1249 for (i = 0; i < datalen; ++i, ++cp) { 1250 if ((i % 16) == 8) 1251 (void)printf("\n\t"); 1252 (void)printf(" %2x", *cp); 1253 } 1254 (void)printf("\ndp:"); 1255 cp = &outpack[ICMP_MINLEN]; 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 break; 1262 } 1263 } 1264 } 1265 } else { 1266 /* 1267 * We've got something other than an ECHOREPLY. 1268 * See if it's a reply to something that we sent. 1269 * We can compare IP destination, protocol, 1270 * and ICMP type and ID. 1271 * 1272 * Only print all the error messages if we are running 1273 * as root to avoid leaking information not normally 1274 * available to those not running as root. 1275 */ 1276 1277 /* 1278 * If we don't have enough bytes for a quoted IP header and an 1279 * ICMP header then stop. 1280 */ 1281 if (icmp_data_raw_len < 1282 (ssize_t)(sizeof(struct ip) + sizeof(struct icmp))) { 1283 if (options & F_VERBOSE) 1284 warnx("quoted data too short (%zd bytes) from %s", 1285 icmp_data_raw_len, inet_ntoa(from->sin_addr)); 1286 return; 1287 } 1288 1289 memcpy(&oip_header_len, icmp_data_raw, sizeof(oip_header_len)); 1290 oip_header_len = (oip_header_len & 0x0f) << 2; 1291 1292 /* Reject IP packets with a short header */ 1293 if (oip_header_len < sizeof(struct ip)) { 1294 if (options & F_VERBOSE) 1295 warnx("inner IHL too short (%d bytes) from %s", 1296 oip_header_len, inet_ntoa(from->sin_addr)); 1297 return; 1298 } 1299 1300 /* 1301 * Check against the actual IHL length, to protect against 1302 * quoated packets carrying IP options. 1303 */ 1304 if (icmp_data_raw_len < 1305 (ssize_t)(oip_header_len + sizeof(struct icmp))) { 1306 if (options & F_VERBOSE) 1307 warnx("inner packet too short (%zd bytes) from %s", 1308 icmp_data_raw_len, inet_ntoa(from->sin_addr)); 1309 return; 1310 } 1311 1312 memcpy(&oip, icmp_data_raw, sizeof(struct ip)); 1313 oicmp_raw = icmp_data_raw + oip_header_len; 1314 memcpy(&oicmp, oicmp_raw, sizeof(struct icmp)); 1315 1316 if (((options & F_VERBOSE) && uid == 0) || 1317 (!(options & F_QUIET2) && 1318 (oip.ip_dst.s_addr == whereto.sin_addr.s_addr) && 1319 (oip.ip_p == IPPROTO_ICMP) && 1320 (oicmp.icmp_type == ICMP_ECHO) && 1321 (oicmp.icmp_id == ident))) { 1322 (void)printf("%zd bytes from %s: ", cc, 1323 pr_addr(from->sin_addr)); 1324 pr_icmph(&icp, &oip, icmp_data_raw); 1325 } else 1326 return; 1327 } 1328 1329 /* Display any IP options */ 1330 cp = (u_char *)buf + sizeof(struct ip); 1331 1332 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp) 1333 switch (*cp) { 1334 case IPOPT_EOL: 1335 hlen = 0; 1336 break; 1337 case IPOPT_LSRR: 1338 case IPOPT_SSRR: 1339 (void)printf(*cp == IPOPT_LSRR ? 1340 "\nLSRR: " : "\nSSRR: "); 1341 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1; 1342 hlen -= 2; 1343 cp += 2; 1344 if (j >= INADDR_LEN && 1345 j <= hlen - (int)sizeof(struct ip)) { 1346 for (;;) { 1347 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1348 if (ina.s_addr == 0) 1349 (void)printf("\t0.0.0.0"); 1350 else 1351 (void)printf("\t%s", 1352 pr_addr(ina)); 1353 hlen -= INADDR_LEN; 1354 cp += INADDR_LEN - 1; 1355 j -= INADDR_LEN; 1356 if (j < INADDR_LEN) 1357 break; 1358 (void)putchar('\n'); 1359 } 1360 } else 1361 (void)printf("\t(truncated route)"); 1362 break; 1363 case IPOPT_RR: 1364 j = cp[IPOPT_OLEN]; /* get length */ 1365 i = cp[IPOPT_OFFSET]; /* and pointer */ 1366 hlen -= 2; 1367 cp += 2; 1368 if (i > j) 1369 i = j; 1370 i = i - IPOPT_MINOFF + 1; 1371 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) { 1372 old_rrlen = 0; 1373 continue; 1374 } 1375 if (i == old_rrlen 1376 && !bcmp((char *)cp, old_rr, i) 1377 && !(options & F_DOT)) { 1378 (void)printf("\t(same route)"); 1379 hlen -= i; 1380 cp += i; 1381 break; 1382 } 1383 old_rrlen = i; 1384 bcopy((char *)cp, old_rr, i); 1385 (void)printf("\nRR: "); 1386 if (i >= INADDR_LEN && 1387 i <= hlen - (int)sizeof(struct ip)) { 1388 for (;;) { 1389 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1390 if (ina.s_addr == 0) 1391 (void)printf("\t0.0.0.0"); 1392 else 1393 (void)printf("\t%s", 1394 pr_addr(ina)); 1395 hlen -= INADDR_LEN; 1396 cp += INADDR_LEN - 1; 1397 i -= INADDR_LEN; 1398 if (i < INADDR_LEN) 1399 break; 1400 (void)putchar('\n'); 1401 } 1402 } else 1403 (void)printf("\t(truncated route)"); 1404 break; 1405 case IPOPT_NOP: 1406 (void)printf("\nNOP"); 1407 break; 1408 default: 1409 (void)printf("\nunknown option %x", *cp); 1410 break; 1411 } 1412 if (!(options & F_DOT)) { 1413 (void)putchar('\n'); 1414 (void)fflush(stdout); 1415 } 1416} 1417 1418/* 1419 * pr_icmph -- 1420 * Print a descriptive string about an ICMP header. 1421 */ 1422static void 1423pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw) 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 pr_iph(oip, oicmp_raw); 1462 break; 1463 case ICMP_SOURCEQUENCH: 1464 (void)printf("Source Quench\n"); 1465 pr_iph(oip, oicmp_raw); 1466 break; 1467 case ICMP_REDIRECT: 1468 switch(icp->icmp_code) { 1469 case ICMP_REDIRECT_NET: 1470 (void)printf("Redirect Network"); 1471 break; 1472 case ICMP_REDIRECT_HOST: 1473 (void)printf("Redirect Host"); 1474 break; 1475 case ICMP_REDIRECT_TOSNET: 1476 (void)printf("Redirect Type of Service and Network"); 1477 break; 1478 case ICMP_REDIRECT_TOSHOST: 1479 (void)printf("Redirect Type of Service and Host"); 1480 break; 1481 default: 1482 (void)printf("Redirect, Bad Code: %d", icp->icmp_code); 1483 break; 1484 } 1485 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr)); 1486 pr_iph(oip, oicmp_raw); 1487 break; 1488 case ICMP_ECHO: 1489 (void)printf("Echo Request\n"); 1490 /* XXX ID + Seq + Data */ 1491 break; 1492 case ICMP_TIMXCEED: 1493 switch(icp->icmp_code) { 1494 case ICMP_TIMXCEED_INTRANS: 1495 (void)printf("Time to live exceeded\n"); 1496 break; 1497 case ICMP_TIMXCEED_REASS: 1498 (void)printf("Frag reassembly time exceeded\n"); 1499 break; 1500 default: 1501 (void)printf("Time exceeded, Bad Code: %d\n", 1502 icp->icmp_code); 1503 break; 1504 } 1505 pr_iph(oip, oicmp_raw); 1506 break; 1507 case ICMP_PARAMPROB: 1508 (void)printf("Parameter problem: pointer = 0x%02x\n", 1509 icp->icmp_hun.ih_pptr); 1510 pr_iph(oip, oicmp_raw); 1511 break; 1512 case ICMP_TSTAMP: 1513 (void)printf("Timestamp\n"); 1514 /* XXX ID + Seq + 3 timestamps */ 1515 break; 1516 case ICMP_TSTAMPREPLY: 1517 (void)printf("Timestamp Reply\n"); 1518 /* XXX ID + Seq + 3 timestamps */ 1519 break; 1520 case ICMP_IREQ: 1521 (void)printf("Information Request\n"); 1522 /* XXX ID + Seq */ 1523 break; 1524 case ICMP_IREQREPLY: 1525 (void)printf("Information Reply\n"); 1526 /* XXX ID + Seq */ 1527 break; 1528 case ICMP_MASKREQ: 1529 (void)printf("Address Mask Request\n"); 1530 break; 1531 case ICMP_MASKREPLY: 1532 (void)printf("Address Mask Reply\n"); 1533 break; 1534 case ICMP_ROUTERADVERT: 1535 (void)printf("Router Advertisement\n"); 1536 break; 1537 case ICMP_ROUTERSOLICIT: 1538 (void)printf("Router Solicitation\n"); 1539 break; 1540 default: 1541 (void)printf("Bad ICMP type: %d\n", icp->icmp_type); 1542 } 1543} 1544 1545/* 1546 * pr_iph -- 1547 * Print an IP header with options. 1548 */ 1549static void 1550pr_iph(struct ip *ip, const u_char *cp) 1551{ 1552 struct in_addr dst_ina, src_ina; 1553 int hlen; 1554 1555 hlen = ip->ip_hl << 2; 1556 cp = cp + sizeof(struct ip); /* point to options */ 1557 1558 memcpy(&src_ina, &ip->ip_src.s_addr, sizeof(src_ina)); 1559 memcpy(&dst_ina, &ip->ip_dst.s_addr, sizeof(dst_ina)); 1560 1561 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks %*s %*s", 1562 (int)strlen(inet_ntoa(src_ina)), "Src", 1563 (int)strlen(inet_ntoa(dst_ina)), "Dst"); 1564 if (hlen > (int)sizeof(struct ip)) 1565 (void)printf(" Opts"); 1566 (void)putchar('\n'); 1567 (void)printf(" %1x %1x %02x %04x %04x", 1568 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len), 1569 ntohs(ip->ip_id)); 1570 (void)printf(" %1x %04x", 1571 (ntohs(ip->ip_off) & 0xe000) >> 13, 1572 ntohs(ip->ip_off) & 0x1fff); 1573 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, 1574 ntohs(ip->ip_sum)); 1575 (void)printf(" %s", inet_ntoa(src_ina)); 1576 (void)printf(" %s", inet_ntoa(dst_ina)); 1577 /* dump any option bytes */ 1578 if (hlen > (int)sizeof(struct ip)) { 1579 (void)printf(" "); 1580 while (hlen-- > (int)sizeof(struct ip)) { 1581 (void)printf("%02x", *cp++); 1582 } 1583 } 1584 (void)putchar('\n'); 1585} 1586 1587/* 1588 * pr_addr -- 1589 * Return an ascii host address as a dotted quad and optionally with 1590 * a hostname. 1591 */ 1592static char * 1593pr_addr(struct in_addr ina) 1594{ 1595 struct hostent *hp; 1596 static char buf[16 + 3 + MAXHOSTNAMELEN]; 1597 1598 if (!(options & F_HOSTNAME)) 1599 return inet_ntoa(ina); 1600 1601 hp = cap_gethostbyaddr(capdns, (char *)&ina, sizeof(ina), AF_INET); 1602 1603 if (hp == NULL) 1604 return inet_ntoa(ina); 1605 1606 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name, 1607 inet_ntoa(ina)); 1608 return(buf); 1609} 1610 1611static char * 1612pr_ntime(n_time timestamp) 1613{ 1614 static char buf[11]; 1615 int hour, min, sec; 1616 1617 sec = ntohl(timestamp) / 1000; 1618 hour = sec / 60 / 60; 1619 min = (sec % (60 * 60)) / 60; 1620 sec = (sec % (60 * 60)) % 60; 1621 1622 (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec); 1623 1624 return (buf); 1625} 1626 1627static void 1628fill(char *bp, char *patp) 1629{ 1630 char *cp; 1631 int pat[16]; 1632 u_int ii, jj, kk; 1633 1634 for (cp = patp; *cp; cp++) { 1635 if (!isxdigit(*cp)) 1636 errx(EX_USAGE, 1637 "patterns must be specified as hex digits"); 1638 1639 } 1640 ii = sscanf(patp, 1641 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", 1642 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], 1643 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], 1644 &pat[13], &pat[14], &pat[15]); 1645 1646 if (ii > 0) 1647 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii) 1648 for (jj = 0; jj < ii; ++jj) 1649 bp[jj + kk] = pat[jj]; 1650 if (!(options & F_QUIET)) { 1651 (void)printf("PATTERN: 0x"); 1652 for (jj = 0; jj < ii; ++jj) 1653 (void)printf("%02x", bp[jj] & 0xFF); 1654 (void)printf("\n"); 1655 } 1656} 1657 1658static cap_channel_t * 1659capdns_setup(void) 1660{ 1661 cap_channel_t *capcas, *capdnsloc; 1662#ifdef WITH_CASPER 1663 const char *types[2]; 1664 int families[1]; 1665#endif 1666 capcas = cap_init(); 1667 if (capcas == NULL) 1668 err(1, "unable to create casper process"); 1669 capdnsloc = cap_service_open(capcas, "system.dns"); 1670 /* Casper capability no longer needed. */ 1671 cap_close(capcas); 1672 if (capdnsloc == NULL) 1673 err(1, "unable to open system.dns service"); 1674#ifdef WITH_CASPER 1675 types[0] = "NAME2ADDR"; 1676 types[1] = "ADDR2NAME"; 1677 if (cap_dns_type_limit(capdnsloc, types, 2) < 0) 1678 err(1, "unable to limit access to system.dns service"); 1679 families[0] = AF_INET; 1680 if (cap_dns_family_limit(capdnsloc, families, 1) < 0) 1681 err(1, "unable to limit access to system.dns service"); 1682#endif 1683 return (capdnsloc); 1684} 1685