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#if 0 36#ifndef lint 37static const char copyright[] = 38"@(#) Copyright (c) 1989, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40#endif /* not lint */ 41 42#ifndef lint 43static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93"; 44#endif /* not lint */ 45#endif 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD$"); 48 49/* 50 * P I N G . C 51 * 52 * Using the Internet Control Message Protocol (ICMP) "ECHO" facility, 53 * measure round-trip-delays and packet loss across network paths. 54 * 55 * Author - 56 * Mike Muuss 57 * U. S. Army Ballistic Research Laboratory 58 * December, 1983 59 * 60 * Status - 61 * Public Domain. Distribution Unlimited. 62 * Bugs - 63 * More statistics could always be gathered. 64 * This program has to run SUID to ROOT to access the ICMP socket. 65 */ 66 67#include <sys/param.h> /* NB: we rely on this for <sys/types.h> */ 68#include <sys/capsicum.h> 69#include <sys/socket.h> 70#include <sys/sysctl.h> 71#include <sys/time.h> 72#include <sys/uio.h> 73 74#include <netinet/in.h> 75#include <netinet/in_systm.h> 76#include <netinet/ip.h> 77#include <netinet/ip_icmp.h> 78#include <netinet/ip_var.h> 79#include <arpa/inet.h> 80 81#include <libcasper.h> 82#include <casper/cap_dns.h> 83 84#ifdef IPSEC 85#include <netipsec/ipsec.h> 86#endif /*IPSEC*/ 87 88#include <capsicum_helpers.h> 89#include <ctype.h> 90#include <err.h> 91#include <errno.h> 92#include <math.h> 93#include <netdb.h> 94#include <stddef.h> 95#include <signal.h> 96#include <stdio.h> 97#include <stdlib.h> 98#include <string.h> 99#include <sysexits.h> 100#include <time.h> 101#include <unistd.h> 102 103#include "main.h" 104#include "ping.h" 105#include "utils.h" 106 107#define INADDR_LEN ((int)sizeof(in_addr_t)) 108#define TIMEVAL_LEN ((int)sizeof(struct tv32)) 109#define MASK_LEN (ICMP_MASKLEN - ICMP_MINLEN) 110#define TS_LEN (ICMP_TSLEN - ICMP_MINLEN) 111#define DEFDATALEN 56 /* default data length */ 112#define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */ 113 /* runs out of buffer space */ 114#define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN) 115#define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN) 116#define MAXWAIT 10000 /* max ms to wait for response */ 117#define MAXALARM (60 * 60) /* max seconds for alarm timeout */ 118#define MAXTOS 255 119 120#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ 121#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ 122#define SET(bit) (A(bit) |= B(bit)) 123#define CLR(bit) (A(bit) &= (~B(bit))) 124#define TST(bit) (A(bit) & B(bit)) 125 126struct tv32 { 127 int32_t tv32_sec; 128 int32_t tv32_nsec; 129}; 130 131/* various options */ 132static int options; 133#define F_FLOOD 0x0001 134#define F_INTERVAL 0x0002 135#define F_NUMERIC 0x0004 136#define F_PINGFILLED 0x0008 137#define F_QUIET 0x0010 138#define F_RROUTE 0x0020 139#define F_SO_DEBUG 0x0040 140#define F_SO_DONTROUTE 0x0080 141#define F_VERBOSE 0x0100 142#define F_QUIET2 0x0200 143#define F_NOLOOP 0x0400 144#define F_MTTL 0x0800 145#define F_MIF 0x1000 146#define F_AUDIBLE 0x2000 147#ifdef IPSEC 148#ifdef IPSEC_POLICY_IPSEC 149#define F_POLICY 0x4000 150#endif /*IPSEC_POLICY_IPSEC*/ 151#endif /*IPSEC*/ 152#define F_TTL 0x8000 153#define F_MISSED 0x10000 154#define F_ONCE 0x20000 155#define F_HDRINCL 0x40000 156#define F_MASK 0x80000 157#define F_TIME 0x100000 158#define F_SWEEP 0x200000 159#define F_WAITTIME 0x400000 160#define F_IP_VLAN_PCP 0x800000 161 162/* 163 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum 164 * number of received sequence numbers we can keep track of. Change 128 165 * to 8192 for complete accuracy... 166 */ 167#define MAX_DUP_CHK (8 * 128) 168static int mx_dup_ck = MAX_DUP_CHK; 169static char rcvd_tbl[MAX_DUP_CHK / 8]; 170 171static struct sockaddr_in whereto; /* who to ping */ 172static int datalen = DEFDATALEN; 173static int maxpayload; 174static int ssend; /* send socket file descriptor */ 175static int srecv; /* receive socket file descriptor */ 176static u_char outpackhdr[IP_MAXPACKET], *outpack; 177static char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */ 178static char BSPACE = '\b'; /* characters written for flood */ 179static char DOT = '.'; 180static char *hostname; 181static char *shostname; 182static int ident; /* process id to identify our packets */ 183static int uid; /* cached uid for micro-optimization */ 184static u_char icmp_type = ICMP_ECHO; 185static u_char icmp_type_rsp = ICMP_ECHOREPLY; 186static int phdr_len = 0; 187static int send_len; 188 189/* counters */ 190static long nmissedmax; /* max value of ntransmitted - nreceived - 1 */ 191static long npackets; /* max packets to transmit */ 192static long nreceived; /* # of packets we got back */ 193static long nrepeats; /* number of duplicates */ 194static long ntransmitted; /* sequence # for outbound packets = #sent */ 195static long snpackets; /* max packets to transmit in one sweep */ 196static long sntransmitted; /* # of packets we sent in this sweep */ 197static int sweepmax; /* max value of payload in sweep */ 198static int sweepmin = 0; /* start value of payload in sweep */ 199static int sweepincr = 1; /* payload increment in sweep */ 200static int interval = 1000; /* interval between packets, ms */ 201static int waittime = MAXWAIT; /* timeout for each packet */ 202static long nrcvtimeout = 0; /* # of packets we got back after waittime */ 203 204/* timing */ 205static int timing; /* flag to do timing */ 206static double tmin = 999999999.0; /* minimum round trip time */ 207static double tmax = 0.0; /* maximum round trip time */ 208static double tsum = 0.0; /* sum of all times, for doing average */ 209static double tsumsq = 0.0; /* sum of all times squared, for std. dev. */ 210 211/* nonzero if we've been told to finish up */ 212static volatile sig_atomic_t finish_up; 213static volatile sig_atomic_t siginfo_p; 214 215static cap_channel_t *capdns; 216 217static void fill(char *, char *); 218static cap_channel_t *capdns_setup(void); 219static void check_status(void); 220static void finish(void) __dead2; 221static void pinger(void); 222static char *pr_addr(struct in_addr); 223static char *pr_ntime(n_time); 224static void pr_icmph(struct icmp *, struct ip *, const u_char *const); 225static void pr_iph(struct ip *); 226static void pr_pack(char *, ssize_t, struct sockaddr_in *, struct timespec *); 227static void pr_retip(struct ip *, const u_char *); 228static void status(int); 229static void stopit(int); 230 231int 232ping(int argc, char *const *argv) 233{ 234 struct sockaddr_in from, sock_in; 235 struct in_addr ifaddr; 236 struct timespec last, intvl; 237 struct iovec iov; 238 struct msghdr msg; 239 struct sigaction si_sa; 240 size_t sz; 241 u_char *datap, packet[IP_MAXPACKET] __aligned(4); 242 const char *errstr; 243 char *ep, *source, *target, *payload; 244 struct hostent *hp; 245#ifdef IPSEC_POLICY_IPSEC 246 char *policy_in, *policy_out; 247#endif 248 struct sockaddr_in *to; 249 double t; 250 u_long alarmtimeout; 251 long long ltmp; 252 int almost_done, ch, df, hold, i, icmp_len, mib[4], preload; 253 int ssend_errno, srecv_errno, tos, ttl, pcp; 254 char ctrl[CMSG_SPACE(sizeof(struct timespec))]; 255 char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN]; 256#ifdef IP_OPTIONS 257 char rspace[MAX_IPOPTLEN]; /* record route space */ 258#endif 259 unsigned char loop, mttl; 260 261 payload = source = NULL; 262#ifdef IPSEC_POLICY_IPSEC 263 policy_in = policy_out = NULL; 264#endif 265 cap_rights_t rights; 266 267 options |= F_NUMERIC; 268 269 /* 270 * Do the stuff that we need root priv's for *first*, and 271 * then drop our setuid bit. Save error reporting for 272 * after arg parsing. 273 * 274 * Historicaly ping was using one socket 's' for sending and for 275 * receiving. After capsicum(4) related changes we use two 276 * sockets. It was done for special ping use case - when user 277 * issue ping on multicast or broadcast address replies come 278 * from different addresses, not from the address we 279 * connect(2)'ed to, and send socket do not receive those 280 * packets. 281 */ 282 ssend = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 283 ssend_errno = errno; 284 srecv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 285 srecv_errno = errno; 286 287 if (setuid(getuid()) != 0) 288 err(EX_NOPERM, "setuid() failed"); 289 uid = getuid(); 290 291 if (ssend < 0) { 292 errno = ssend_errno; 293 err(EX_OSERR, "ssend socket"); 294 } 295 296 if (srecv < 0) { 297 errno = srecv_errno; 298 err(EX_OSERR, "srecv socket"); 299 } 300 301 alarmtimeout = df = preload = tos = pcp = 0; 302 303 outpack = outpackhdr + sizeof(struct ip); 304 while ((ch = getopt(argc, argv, 305 "4AaC:c:DdfG:g:Hh:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:" 306#ifdef IPSEC 307#ifdef IPSEC_POLICY_IPSEC 308 "P:" 309#endif /*IPSEC_POLICY_IPSEC*/ 310#endif /*IPSEC*/ 311 )) != -1) 312 { 313 switch(ch) { 314 case '4': 315 /* This option is processed in main(). */ 316 break; 317 case 'A': 318 options |= F_MISSED; 319 break; 320 case 'a': 321 options |= F_AUDIBLE; 322 break; 323 case 'C': 324 options |= F_IP_VLAN_PCP; 325 ltmp = strtonum(optarg, -1, 7, &errstr); 326 if (errstr != NULL) 327 errx(EX_USAGE, "invalid PCP: `%s'", optarg); 328 pcp = ltmp; 329 break; 330 case 'c': 331 ltmp = strtonum(optarg, 1, LONG_MAX, &errstr); 332 if (errstr != NULL) 333 errx(EX_USAGE, 334 "invalid count of packets to transmit: `%s'", 335 optarg); 336 npackets = (long)ltmp; 337 break; 338 case 'D': 339 options |= F_HDRINCL; 340 df = 1; 341 break; 342 case 'd': 343 options |= F_SO_DEBUG; 344 break; 345 case 'f': 346 if (uid) { 347 errno = EPERM; 348 err(EX_NOPERM, "-f flag"); 349 } 350 options |= F_FLOOD; 351 setbuf(stdout, (char *)NULL); 352 break; 353 case 'G': /* Maximum packet size for ping sweep */ 354 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 355 if (errstr != NULL) { 356 errx(EX_USAGE, "invalid packet size: `%s'", 357 optarg); 358 } 359 sweepmax = (int)ltmp; 360 if (uid != 0 && sweepmax > DEFDATALEN) { 361 errc(EX_NOPERM, EPERM, 362 "packet size too large: %d > %u", 363 sweepmax, DEFDATALEN); 364 } 365 options |= F_SWEEP; 366 break; 367 case 'g': /* Minimum packet size for ping sweep */ 368 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 369 if (errstr != NULL) { 370 errx(EX_USAGE, "invalid packet size: `%s'", 371 optarg); 372 } 373 sweepmin = (int)ltmp; 374 if (uid != 0 && sweepmin > DEFDATALEN) { 375 errc(EX_NOPERM, EPERM, 376 "packet size too large: %d > %u", 377 sweepmin, DEFDATALEN); 378 } 379 options |= F_SWEEP; 380 break; 381 case 'H': 382 options &= ~F_NUMERIC; 383 break; 384 case 'h': /* Packet size increment for ping sweep */ 385 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 386 if (errstr != NULL) { 387 errx(EX_USAGE, "invalid packet size: `%s'", 388 optarg); 389 } 390 sweepincr = (int)ltmp; 391 if (uid != 0 && sweepincr > DEFDATALEN) { 392 errc(EX_NOPERM, EPERM, 393 "packet size too large: %d > %u", 394 sweepincr, DEFDATALEN); 395 } 396 options |= F_SWEEP; 397 break; 398 case 'I': /* multicast interface */ 399 if (inet_aton(optarg, &ifaddr) == 0) 400 errx(EX_USAGE, 401 "invalid multicast interface: `%s'", 402 optarg); 403 options |= F_MIF; 404 break; 405 case 'i': /* wait between sending packets */ 406 t = strtod(optarg, &ep) * 1000.0; 407 if (*ep || ep == optarg || t > (double)INT_MAX) 408 errx(EX_USAGE, "invalid timing interval: `%s'", 409 optarg); 410 options |= F_INTERVAL; 411 interval = (int)t; 412 if (uid && interval < 1000) { 413 errno = EPERM; 414 err(EX_NOPERM, "-i interval too short"); 415 } 416 break; 417 case 'L': 418 options |= F_NOLOOP; 419 loop = 0; 420 break; 421 case 'l': 422 ltmp = strtonum(optarg, 0, INT_MAX, &errstr); 423 if (errstr != NULL) 424 errx(EX_USAGE, 425 "invalid preload value: `%s'", optarg); 426 if (uid) { 427 errno = EPERM; 428 err(EX_NOPERM, "-l flag"); 429 } 430 preload = (int)ltmp; 431 break; 432 case 'M': 433 switch(optarg[0]) { 434 case 'M': 435 case 'm': 436 options |= F_MASK; 437 break; 438 case 'T': 439 case 't': 440 options |= F_TIME; 441 break; 442 default: 443 errx(EX_USAGE, "invalid message: `%c'", optarg[0]); 444 break; 445 } 446 break; 447 case 'm': /* TTL */ 448 ltmp = strtonum(optarg, 0, MAXTTL, &errstr); 449 if (errstr != NULL) 450 errx(EX_USAGE, "invalid TTL: `%s'", optarg); 451 ttl = (int)ltmp; 452 options |= F_TTL; 453 break; 454 case 'n': 455 options |= F_NUMERIC; 456 break; 457 case 'o': 458 options |= F_ONCE; 459 break; 460#ifdef IPSEC 461#ifdef IPSEC_POLICY_IPSEC 462 case 'P': 463 options |= F_POLICY; 464 if (!strncmp("in", optarg, 2)) 465 policy_in = strdup(optarg); 466 else if (!strncmp("out", optarg, 3)) 467 policy_out = strdup(optarg); 468 else 469 errx(1, "invalid security policy"); 470 break; 471#endif /*IPSEC_POLICY_IPSEC*/ 472#endif /*IPSEC*/ 473 case 'p': /* fill buffer with user pattern */ 474 options |= F_PINGFILLED; 475 payload = optarg; 476 break; 477 case 'Q': 478 options |= F_QUIET2; 479 break; 480 case 'q': 481 options |= F_QUIET; 482 break; 483 case 'R': 484 options |= F_RROUTE; 485 break; 486 case 'r': 487 options |= F_SO_DONTROUTE; 488 break; 489 case 'S': 490 source = optarg; 491 break; 492 case 's': /* size of packet to send */ 493 ltmp = strtonum(optarg, 0, INT_MAX, &errstr); 494 if (errstr != NULL) 495 errx(EX_USAGE, "invalid packet size: `%s'", 496 optarg); 497 datalen = (int)ltmp; 498 if (uid != 0 && datalen > DEFDATALEN) { 499 errno = EPERM; 500 err(EX_NOPERM, 501 "packet size too large: %d > %u", 502 datalen, DEFDATALEN); 503 } 504 break; 505 case 'T': /* multicast TTL */ 506 ltmp = strtonum(optarg, 0, MAXTTL, &errstr); 507 if (errstr != NULL) 508 errx(EX_USAGE, "invalid multicast TTL: `%s'", 509 optarg); 510 mttl = (unsigned char)ltmp; 511 options |= F_MTTL; 512 break; 513 case 't': 514 alarmtimeout = strtoul(optarg, &ep, 0); 515 if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX)) 516 errx(EX_USAGE, "invalid timeout: `%s'", 517 optarg); 518 if (alarmtimeout > MAXALARM) 519 errx(EX_USAGE, "invalid timeout: `%s' > %d", 520 optarg, MAXALARM); 521 { 522 struct itimerval itv; 523 524 timerclear(&itv.it_interval); 525 timerclear(&itv.it_value); 526 itv.it_value.tv_sec = (time_t)alarmtimeout; 527 if (setitimer(ITIMER_REAL, &itv, NULL) != 0) 528 err(1, "setitimer"); 529 } 530 break; 531 case 'v': 532 options |= F_VERBOSE; 533 break; 534 case 'W': /* wait ms for answer */ 535 t = strtod(optarg, &ep); 536 if (*ep || ep == optarg || t > (double)INT_MAX) 537 errx(EX_USAGE, "invalid timing interval: `%s'", 538 optarg); 539 options |= F_WAITTIME; 540 waittime = (int)t; 541 break; 542 case 'z': 543 options |= F_HDRINCL; 544 ltmp = strtol(optarg, &ep, 0); 545 if (*ep || ep == optarg || ltmp > MAXTOS || ltmp < 0) 546 errx(EX_USAGE, "invalid TOS: `%s'", optarg); 547 tos = ltmp; 548 break; 549 default: 550 usage(); 551 } 552 } 553 554 if (argc - optind != 1) 555 usage(); 556 target = argv[optind]; 557 558 switch (options & (F_MASK|F_TIME)) { 559 case 0: break; 560 case F_MASK: 561 icmp_type = ICMP_MASKREQ; 562 icmp_type_rsp = ICMP_MASKREPLY; 563 phdr_len = MASK_LEN; 564 if (!(options & F_QUIET)) 565 (void)printf("ICMP_MASKREQ\n"); 566 break; 567 case F_TIME: 568 icmp_type = ICMP_TSTAMP; 569 icmp_type_rsp = ICMP_TSTAMPREPLY; 570 phdr_len = TS_LEN; 571 if (!(options & F_QUIET)) 572 (void)printf("ICMP_TSTAMP\n"); 573 break; 574 default: 575 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive."); 576 break; 577 } 578 icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len; 579 if (options & F_RROUTE) 580 icmp_len += MAX_IPOPTLEN; 581 maxpayload = IP_MAXPACKET - icmp_len; 582 if (datalen > maxpayload) 583 errx(EX_USAGE, "packet size too large: %d > %d", datalen, 584 maxpayload); 585 send_len = icmp_len + datalen; 586 datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN]; 587 if (options & F_PINGFILLED) { 588 fill((char *)datap, payload); 589 } 590 capdns = capdns_setup(); 591 if (source) { 592 bzero((char *)&sock_in, sizeof(sock_in)); 593 sock_in.sin_family = AF_INET; 594 if (inet_aton(source, &sock_in.sin_addr) != 0) { 595 shostname = source; 596 } else { 597 hp = cap_gethostbyname2(capdns, source, AF_INET); 598 if (!hp) 599 errx(EX_NOHOST, "cannot resolve %s: %s", 600 source, hstrerror(h_errno)); 601 602 sock_in.sin_len = sizeof sock_in; 603 if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) || 604 hp->h_length < 0) 605 errx(1, "gethostbyname2: illegal address"); 606 memcpy(&sock_in.sin_addr, hp->h_addr_list[0], 607 sizeof(sock_in.sin_addr)); 608 (void)strncpy(snamebuf, hp->h_name, 609 sizeof(snamebuf) - 1); 610 snamebuf[sizeof(snamebuf) - 1] = '\0'; 611 shostname = snamebuf; 612 } 613 if (bind(ssend, (struct sockaddr *)&sock_in, sizeof sock_in) == 614 -1) 615 err(1, "bind"); 616 } 617 618 bzero(&whereto, sizeof(whereto)); 619 to = &whereto; 620 to->sin_family = AF_INET; 621 to->sin_len = sizeof *to; 622 if (inet_aton(target, &to->sin_addr) != 0) { 623 hostname = target; 624 } else { 625 hp = cap_gethostbyname2(capdns, target, AF_INET); 626 if (!hp) 627 errx(EX_NOHOST, "cannot resolve %s: %s", 628 target, hstrerror(h_errno)); 629 630 if ((unsigned)hp->h_length > sizeof(to->sin_addr)) 631 errx(1, "gethostbyname2 returned an illegal address"); 632 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr); 633 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); 634 hnamebuf[sizeof(hnamebuf) - 1] = '\0'; 635 hostname = hnamebuf; 636 } 637 638 /* From now on we will use only reverse DNS lookups. */ 639#ifdef WITH_CASPER 640 if (capdns != NULL) { 641 const char *types[1]; 642 643 types[0] = "ADDR2NAME"; 644 if (cap_dns_type_limit(capdns, types, 1) < 0) 645 err(1, "unable to limit access to system.dns service"); 646 } 647#endif 648 if (connect(ssend, (struct sockaddr *)&whereto, sizeof(whereto)) != 0) 649 err(1, "connect"); 650 651 if (options & F_FLOOD && options & F_INTERVAL) 652 errx(EX_USAGE, "-f and -i: incompatible options"); 653 654 if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 655 errx(EX_USAGE, 656 "-f flag cannot be used with multicast destination"); 657 if (options & (F_MIF | F_NOLOOP | F_MTTL) 658 && !IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 659 errx(EX_USAGE, 660 "-I, -L, -T flags cannot be used with unicast destination"); 661 662 if (datalen >= TIMEVAL_LEN) /* can we time transfer */ 663 timing = 1; 664 665 if ((options & (F_PINGFILLED | F_SWEEP)) == 0) 666 for (i = TIMEVAL_LEN; i < datalen; ++i) 667 *datap++ = i; 668 669 ident = getpid() & 0xFFFF; 670 671 hold = 1; 672 if (options & F_SO_DEBUG) { 673 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold, 674 sizeof(hold)); 675 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold, 676 sizeof(hold)); 677 } 678 if (options & F_SO_DONTROUTE) 679 (void)setsockopt(ssend, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, 680 sizeof(hold)); 681 if (options & F_IP_VLAN_PCP) { 682 (void)setsockopt(ssend, IPPROTO_IP, IP_VLAN_PCP, (char *)&pcp, 683 sizeof(pcp)); 684 } 685#ifdef IPSEC 686#ifdef IPSEC_POLICY_IPSEC 687 if (options & F_POLICY) { 688 char *buf; 689 if (policy_in != NULL) { 690 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 691 if (buf == NULL) 692 errx(EX_CONFIG, "%s", ipsec_strerror()); 693 if (setsockopt(srecv, IPPROTO_IP, IP_IPSEC_POLICY, 694 buf, ipsec_get_policylen(buf)) < 0) 695 err(EX_CONFIG, 696 "ipsec policy cannot be configured"); 697 free(buf); 698 } 699 700 if (policy_out != NULL) { 701 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 702 if (buf == NULL) 703 errx(EX_CONFIG, "%s", ipsec_strerror()); 704 if (setsockopt(ssend, IPPROTO_IP, IP_IPSEC_POLICY, 705 buf, ipsec_get_policylen(buf)) < 0) 706 err(EX_CONFIG, 707 "ipsec policy cannot be configured"); 708 free(buf); 709 } 710 } 711#endif /*IPSEC_POLICY_IPSEC*/ 712#endif /*IPSEC*/ 713 714 if (options & F_HDRINCL) { 715 struct ip ip; 716 717 memcpy(&ip, outpackhdr, sizeof(ip)); 718 if (!(options & (F_TTL | F_MTTL))) { 719 mib[0] = CTL_NET; 720 mib[1] = PF_INET; 721 mib[2] = IPPROTO_IP; 722 mib[3] = IPCTL_DEFTTL; 723 sz = sizeof(ttl); 724 if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1) 725 err(1, "sysctl(net.inet.ip.ttl)"); 726 } 727 setsockopt(ssend, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold)); 728 ip.ip_v = IPVERSION; 729 ip.ip_hl = sizeof(struct ip) >> 2; 730 ip.ip_tos = tos; 731 ip.ip_id = 0; 732 ip.ip_off = htons(df ? IP_DF : 0); 733 ip.ip_ttl = ttl; 734 ip.ip_p = IPPROTO_ICMP; 735 ip.ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY; 736 ip.ip_dst = to->sin_addr; 737 memcpy(outpackhdr, &ip, sizeof(ip)); 738 } 739 740 /* 741 * Here we enter capability mode. Further down access to global 742 * namespaces (e.g filesystem) is restricted (see capsicum(4)). 743 * We must connect(2) our socket before this point. 744 */ 745 caph_cache_catpages(); 746 if (caph_enter_casper() < 0) 747 err(1, "caph_enter_casper"); 748 749 cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT); 750 if (caph_rights_limit(srecv, &rights) < 0) 751 err(1, "cap_rights_limit srecv"); 752 cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT); 753 if (caph_rights_limit(ssend, &rights) < 0) 754 err(1, "cap_rights_limit ssend"); 755 756 /* record route option */ 757 if (options & F_RROUTE) { 758#ifdef IP_OPTIONS 759 bzero(rspace, sizeof(rspace)); 760 rspace[IPOPT_OPTVAL] = IPOPT_RR; 761 rspace[IPOPT_OLEN] = sizeof(rspace) - 1; 762 rspace[IPOPT_OFFSET] = IPOPT_MINOFF; 763 rspace[sizeof(rspace) - 1] = IPOPT_EOL; 764 if (setsockopt(ssend, IPPROTO_IP, IP_OPTIONS, rspace, 765 sizeof(rspace)) < 0) 766 err(EX_OSERR, "setsockopt IP_OPTIONS"); 767#else 768 errx(EX_UNAVAILABLE, 769 "record route not available in this implementation"); 770#endif /* IP_OPTIONS */ 771 } 772 773 if (options & F_TTL) { 774 if (setsockopt(ssend, IPPROTO_IP, IP_TTL, &ttl, 775 sizeof(ttl)) < 0) { 776 err(EX_OSERR, "setsockopt IP_TTL"); 777 } 778 } 779 if (options & F_NOLOOP) { 780 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, 781 sizeof(loop)) < 0) { 782 err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP"); 783 } 784 } 785 if (options & F_MTTL) { 786 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_TTL, &mttl, 787 sizeof(mttl)) < 0) { 788 err(EX_OSERR, "setsockopt IP_MULTICAST_TTL"); 789 } 790 } 791 if (options & F_MIF) { 792 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr, 793 sizeof(ifaddr)) < 0) { 794 err(EX_OSERR, "setsockopt IP_MULTICAST_IF"); 795 } 796 } 797#ifdef SO_TIMESTAMP 798 { 799 int on = 1; 800 int ts_clock = SO_TS_MONOTONIC; 801 if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on, 802 sizeof(on)) < 0) 803 err(EX_OSERR, "setsockopt SO_TIMESTAMP"); 804 if (setsockopt(srecv, SOL_SOCKET, SO_TS_CLOCK, &ts_clock, 805 sizeof(ts_clock)) < 0) 806 err(EX_OSERR, "setsockopt SO_TS_CLOCK"); 807 } 808#endif 809 if (sweepmax) { 810 if (sweepmin > sweepmax) 811 errx(EX_USAGE, 812 "Maximum packet size must be no less than the minimum packet size"); 813 814 if (sweepmax > maxpayload - TIMEVAL_LEN) 815 errx(EX_USAGE, "Invalid sweep maximum"); 816 817 if (datalen != DEFDATALEN) 818 errx(EX_USAGE, 819 "Packet size and ping sweep are mutually exclusive"); 820 821 if (npackets > 0) { 822 snpackets = npackets; 823 npackets = 0; 824 } else 825 snpackets = 1; 826 datalen = sweepmin; 827 send_len = icmp_len + sweepmin; 828 } 829 if (options & F_SWEEP && !sweepmax) 830 errx(EX_USAGE, "Maximum sweep size must be specified"); 831 832 /* 833 * When pinging the broadcast address, you can get a lot of answers. 834 * Doing something so evil is useful if you are trying to stress the 835 * ethernet, or just want to fill the arp cache to get some stuff for 836 * /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast 837 * or multicast pings if they wish. 838 */ 839 840 /* 841 * XXX receive buffer needs undetermined space for mbuf overhead 842 * as well. 843 */ 844 hold = IP_MAXPACKET + 128; 845 (void)setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold, 846 sizeof(hold)); 847 /* CAP_SETSOCKOPT removed */ 848 cap_rights_init(&rights, CAP_RECV, CAP_EVENT); 849 if (caph_rights_limit(srecv, &rights) < 0) 850 err(1, "cap_rights_limit srecv setsockopt"); 851 if (uid == 0) 852 (void)setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, (char *)&hold, 853 sizeof(hold)); 854 /* CAP_SETSOCKOPT removed */ 855 cap_rights_init(&rights, CAP_SEND); 856 if (caph_rights_limit(ssend, &rights) < 0) 857 err(1, "cap_rights_limit ssend setsockopt"); 858 859 if (to->sin_family == AF_INET) { 860 (void)printf("PING %s (%s)", hostname, 861 inet_ntoa(to->sin_addr)); 862 if (source) 863 (void)printf(" from %s", shostname); 864 if (sweepmax) 865 (void)printf(": (%d ... %d) data bytes\n", 866 sweepmin, sweepmax); 867 else 868 (void)printf(": %d data bytes\n", datalen); 869 870 } else { 871 if (sweepmax) 872 (void)printf("PING %s: (%d ... %d) data bytes\n", 873 hostname, sweepmin, sweepmax); 874 else 875 (void)printf("PING %s: %d data bytes\n", hostname, datalen); 876 } 877 878 /* 879 * Use sigaction() instead of signal() to get unambiguous semantics, 880 * in particular with SA_RESTART not set. 881 */ 882 883 sigemptyset(&si_sa.sa_mask); 884 si_sa.sa_flags = 0; 885 886 si_sa.sa_handler = stopit; 887 if (sigaction(SIGINT, &si_sa, 0) == -1) { 888 err(EX_OSERR, "sigaction SIGINT"); 889 } 890 891 si_sa.sa_handler = status; 892 if (sigaction(SIGINFO, &si_sa, 0) == -1) { 893 err(EX_OSERR, "sigaction"); 894 } 895 896 if (alarmtimeout > 0) { 897 si_sa.sa_handler = stopit; 898 if (sigaction(SIGALRM, &si_sa, 0) == -1) 899 err(EX_OSERR, "sigaction SIGALRM"); 900 } 901 902 bzero(&msg, sizeof(msg)); 903 msg.msg_name = (caddr_t)&from; 904 msg.msg_iov = &iov; 905 msg.msg_iovlen = 1; 906#ifdef SO_TIMESTAMP 907 msg.msg_control = (caddr_t)ctrl; 908 msg.msg_controllen = sizeof(ctrl); 909#endif 910 iov.iov_base = packet; 911 iov.iov_len = IP_MAXPACKET; 912 913 if (preload == 0) 914 pinger(); /* send the first ping */ 915 else { 916 if (npackets != 0 && preload > npackets) 917 preload = npackets; 918 while (preload--) /* fire off them quickies */ 919 pinger(); 920 } 921 (void)clock_gettime(CLOCK_MONOTONIC, &last); 922 923 if (options & F_FLOOD) { 924 intvl.tv_sec = 0; 925 intvl.tv_nsec = 10000000; 926 } else { 927 intvl.tv_sec = interval / 1000; 928 intvl.tv_nsec = interval % 1000 * 1000000; 929 } 930 931 almost_done = 0; 932 while (!finish_up) { 933 struct timespec now, timeout; 934 fd_set rfds; 935 int n; 936 ssize_t cc; 937 938 check_status(); 939 if ((unsigned)srecv >= FD_SETSIZE) 940 errx(EX_OSERR, "descriptor too large"); 941 FD_ZERO(&rfds); 942 FD_SET(srecv, &rfds); 943 (void)clock_gettime(CLOCK_MONOTONIC, &now); 944 timespecadd(&last, &intvl, &timeout); 945 timespecsub(&timeout, &now, &timeout); 946 if (timeout.tv_sec < 0) 947 timespecclear(&timeout); 948 n = pselect(srecv + 1, &rfds, NULL, NULL, &timeout, NULL); 949 if (n < 0) 950 continue; /* Must be EINTR. */ 951 if (n == 1) { 952 struct timespec *tv = NULL; 953#ifdef SO_TIMESTAMP 954 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); 955#endif 956 msg.msg_namelen = sizeof(from); 957 if ((cc = recvmsg(srecv, &msg, 0)) < 0) { 958 if (errno == EINTR) 959 continue; 960 warn("recvmsg"); 961 continue; 962 } 963#ifdef SO_TIMESTAMP 964 if (cmsg != NULL && 965 cmsg->cmsg_level == SOL_SOCKET && 966 cmsg->cmsg_type == SCM_TIMESTAMP && 967 cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) { 968 /* Copy to avoid alignment problems: */ 969 memcpy(&now, CMSG_DATA(cmsg), sizeof(now)); 970 tv = &now; 971 } 972#endif 973 if (tv == NULL) { 974 (void)clock_gettime(CLOCK_MONOTONIC, &now); 975 tv = &now; 976 } 977 pr_pack((char *)packet, cc, &from, tv); 978 if ((options & F_ONCE && nreceived) || 979 (npackets && nreceived >= npackets)) 980 break; 981 } 982 if (n == 0 || options & F_FLOOD) { 983 if (sweepmax && sntransmitted == snpackets) { 984 if (datalen + sweepincr > sweepmax) 985 break; 986 for (i = 0; i < sweepincr; i++) 987 *datap++ = i; 988 datalen += sweepincr; 989 send_len = icmp_len + datalen; 990 sntransmitted = 0; 991 } 992 if (!npackets || ntransmitted < npackets) 993 pinger(); 994 else { 995 if (almost_done) 996 break; 997 almost_done = 1; 998 intvl.tv_nsec = 0; 999 if (nreceived) { 1000 intvl.tv_sec = 2 * tmax / 1000; 1001 if (!intvl.tv_sec) 1002 intvl.tv_sec = 1; 1003 } else { 1004 intvl.tv_sec = waittime / 1000; 1005 intvl.tv_nsec = waittime % 1000 * 1000000; 1006 } 1007 } 1008 (void)clock_gettime(CLOCK_MONOTONIC, &last); 1009 if (ntransmitted - nreceived - 1 > nmissedmax) { 1010 nmissedmax = ntransmitted - nreceived - 1; 1011 if (options & F_MISSED) 1012 (void)write(STDOUT_FILENO, &BBELL, 1); 1013 } 1014 } 1015 } 1016 finish(); 1017 /* NOTREACHED */ 1018 exit(0); /* Make the compiler happy */ 1019} 1020 1021/* 1022 * stopit -- 1023 * Set the global bit that causes the main loop to quit. 1024 * Do NOT call finish() from here, since finish() does far too much 1025 * to be called from a signal handler. 1026 */ 1027void 1028stopit(int sig __unused) 1029{ 1030 1031 /* 1032 * When doing reverse DNS lookups, the finish_up flag might not 1033 * be noticed for a while. Just exit if we get a second SIGINT. 1034 */ 1035 if (!(options & F_NUMERIC) && finish_up) 1036 _exit(nreceived ? 0 : 2); 1037 finish_up = 1; 1038} 1039 1040/* 1041 * pinger -- 1042 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet 1043 * will be added on by the kernel. The ID field is our UNIX process ID, 1044 * and the sequence number is an ascending integer. The first TIMEVAL_LEN 1045 * bytes of the data portion are used to hold a UNIX "timespec" struct in 1046 * host byte-order, to compute the round-trip time. 1047 */ 1048static void 1049pinger(void) 1050{ 1051 struct timespec now; 1052 struct tv32 tv32; 1053 struct icmp icp; 1054 int cc, i; 1055 u_char *packet; 1056 1057 packet = outpack; 1058 memcpy(&icp, outpack, ICMP_MINLEN + phdr_len); 1059 icp.icmp_type = icmp_type; 1060 icp.icmp_code = 0; 1061 icp.icmp_cksum = 0; 1062 icp.icmp_seq = htons(ntransmitted); 1063 icp.icmp_id = ident; /* ID */ 1064 1065 CLR(ntransmitted % mx_dup_ck); 1066 1067 if ((options & F_TIME) || timing) { 1068 (void)clock_gettime(CLOCK_MONOTONIC, &now); 1069 /* 1070 * Truncate seconds down to 32 bits in order 1071 * to fit the timestamp within 8 bytes of the 1072 * packet. We're only concerned with 1073 * durations, not absolute times. 1074 */ 1075 tv32.tv32_sec = (uint32_t)htonl(now.tv_sec); 1076 tv32.tv32_nsec = (uint32_t)htonl(now.tv_nsec); 1077 if (options & F_TIME) 1078 icp.icmp_otime = htonl((now.tv_sec % (24*60*60)) 1079 * 1000 + now.tv_nsec / 1000000); 1080 if (timing) 1081 bcopy((void *)&tv32, 1082 (void *)&outpack[ICMP_MINLEN + phdr_len], 1083 sizeof(tv32)); 1084 } 1085 1086 memcpy(outpack, &icp, ICMP_MINLEN + phdr_len); 1087 1088 cc = ICMP_MINLEN + phdr_len + datalen; 1089 1090 /* compute ICMP checksum here */ 1091 icp.icmp_cksum = in_cksum(outpack, cc); 1092 /* Update icmp_cksum in the raw packet data buffer. */ 1093 memcpy(outpack + offsetof(struct icmp, icmp_cksum), &icp.icmp_cksum, 1094 sizeof(icp.icmp_cksum)); 1095 1096 if (options & F_HDRINCL) { 1097 struct ip ip; 1098 1099 cc += sizeof(struct ip); 1100 ip.ip_len = htons(cc); 1101 /* Update ip_len in the raw packet data buffer. */ 1102 memcpy(outpackhdr + offsetof(struct ip, ip_len), &ip.ip_len, 1103 sizeof(ip.ip_len)); 1104 ip.ip_sum = in_cksum(outpackhdr, cc); 1105 /* Update ip_sum in the raw packet data buffer. */ 1106 memcpy(outpackhdr + offsetof(struct ip, ip_sum), &ip.ip_sum, 1107 sizeof(ip.ip_sum)); 1108 packet = outpackhdr; 1109 } 1110 i = send(ssend, (char *)packet, cc, 0); 1111 if (i < 0 || i != cc) { 1112 if (i < 0) { 1113 if (options & F_FLOOD && errno == ENOBUFS) { 1114 usleep(FLOOD_BACKOFF); 1115 return; 1116 } 1117 warn("sendto"); 1118 } else { 1119 warn("%s: partial write: %d of %d bytes", 1120 hostname, i, cc); 1121 } 1122 } 1123 ntransmitted++; 1124 sntransmitted++; 1125 if (!(options & F_QUIET) && options & F_FLOOD) 1126 (void)write(STDOUT_FILENO, &DOT, 1); 1127} 1128 1129/* 1130 * pr_pack -- 1131 * Print out the packet, if it came from us. This logic is necessary 1132 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets 1133 * which arrive ('tis only fair). This permits multiple copies of this 1134 * program to be run without having intermingled output (or statistics!). 1135 */ 1136static void 1137pr_pack(char *buf, ssize_t cc, struct sockaddr_in *from, struct timespec *tv) 1138{ 1139 struct in_addr ina; 1140 u_char *cp, *dp, l; 1141 struct icmp icp; 1142 struct ip ip; 1143 const u_char *icmp_data_raw; 1144 double triptime; 1145 int dupflag, hlen, i, j, recv_len; 1146 uint16_t seq; 1147 static int old_rrlen; 1148 static char old_rr[MAX_IPOPTLEN]; 1149 struct ip oip; 1150 u_char oip_header_len; 1151 struct icmp oicmp; 1152 const u_char *oicmp_raw; 1153 1154 /* 1155 * Get size of IP header of the received packet. The 1156 * information is contained in the lower four bits of the 1157 * first byte. 1158 */ 1159 memcpy(&l, buf, sizeof(l)); 1160 hlen = (l & 0x0f) << 2; 1161 memcpy(&ip, buf, hlen); 1162 1163 /* Check the IP header */ 1164 recv_len = cc; 1165 if (cc < hlen + ICMP_MINLEN) { 1166 if (options & F_VERBOSE) 1167 warn("packet too short (%zd bytes) from %s", cc, 1168 inet_ntoa(from->sin_addr)); 1169 return; 1170 } 1171 1172#ifndef icmp_data 1173 icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_ip); 1174#else 1175 icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_data); 1176#endif 1177 1178 /* Now the ICMP part */ 1179 cc -= hlen; 1180 memcpy(&icp, buf + hlen, MIN((ssize_t)sizeof(icp), cc)); 1181 if (icp.icmp_type == icmp_type_rsp) { 1182 if (icp.icmp_id != ident) 1183 return; /* 'Twas not our ECHO */ 1184 ++nreceived; 1185 triptime = 0.0; 1186 if (timing) { 1187 struct timespec tv1; 1188 struct tv32 tv32; 1189 const u_char *tp; 1190 1191 tp = icmp_data_raw + phdr_len; 1192 1193 if ((size_t)(cc - ICMP_MINLEN - phdr_len) >= 1194 sizeof(tv1)) { 1195 /* Copy to avoid alignment problems: */ 1196 memcpy(&tv32, tp, sizeof(tv32)); 1197 tv1.tv_sec = ntohl(tv32.tv32_sec); 1198 tv1.tv_nsec = ntohl(tv32.tv32_nsec); 1199 timespecsub(tv, &tv1, tv); 1200 triptime = ((double)tv->tv_sec) * 1000.0 + 1201 ((double)tv->tv_nsec) / 1000000.0; 1202 tsum += triptime; 1203 tsumsq += triptime * triptime; 1204 if (triptime < tmin) 1205 tmin = triptime; 1206 if (triptime > tmax) 1207 tmax = triptime; 1208 } else 1209 timing = 0; 1210 } 1211 1212 seq = ntohs(icp.icmp_seq); 1213 1214 if (TST(seq % mx_dup_ck)) { 1215 ++nrepeats; 1216 --nreceived; 1217 dupflag = 1; 1218 } else { 1219 SET(seq % mx_dup_ck); 1220 dupflag = 0; 1221 } 1222 1223 if (options & F_QUIET) 1224 return; 1225 1226 if (options & F_WAITTIME && triptime > waittime) { 1227 ++nrcvtimeout; 1228 return; 1229 } 1230 1231 if (options & F_FLOOD) 1232 (void)write(STDOUT_FILENO, &BSPACE, 1); 1233 else { 1234 (void)printf("%zd bytes from %s: icmp_seq=%u", cc, 1235 pr_addr(from->sin_addr), seq); 1236 (void)printf(" ttl=%d", ip.ip_ttl); 1237 if (timing) 1238 (void)printf(" time=%.3f ms", triptime); 1239 if (dupflag) 1240 (void)printf(" (DUP!)"); 1241 if (options & F_AUDIBLE) 1242 (void)write(STDOUT_FILENO, &BBELL, 1); 1243 if (options & F_MASK) { 1244 /* Just prentend this cast isn't ugly */ 1245 (void)printf(" mask=%s", 1246 inet_ntoa(*(struct in_addr *)&(icp.icmp_mask))); 1247 } 1248 if (options & F_TIME) { 1249 (void)printf(" tso=%s", pr_ntime(icp.icmp_otime)); 1250 (void)printf(" tsr=%s", pr_ntime(icp.icmp_rtime)); 1251 (void)printf(" tst=%s", pr_ntime(icp.icmp_ttime)); 1252 } 1253 if (recv_len != send_len) { 1254 (void)printf( 1255 "\nwrong total length %d instead of %d", 1256 recv_len, send_len); 1257 } 1258 /* check the data */ 1259 cp = (u_char*)(buf + hlen + offsetof(struct icmp, 1260 icmp_data) + phdr_len); 1261 dp = &outpack[ICMP_MINLEN + phdr_len]; 1262 cc -= ICMP_MINLEN + phdr_len; 1263 i = 0; 1264 if (timing) { /* don't check variable timestamp */ 1265 cp += TIMEVAL_LEN; 1266 dp += TIMEVAL_LEN; 1267 cc -= TIMEVAL_LEN; 1268 i += TIMEVAL_LEN; 1269 } 1270 for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) { 1271 if (*cp != *dp) { 1272 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", 1273 i, *dp, *cp); 1274 (void)printf("\ncp:"); 1275 cp = (u_char*)(buf + hlen + 1276 offsetof(struct icmp, icmp_data)); 1277 for (i = 0; i < datalen; ++i, ++cp) { 1278 if ((i % 16) == 8) 1279 (void)printf("\n\t"); 1280 (void)printf("%2x ", *cp); 1281 } 1282 (void)printf("\ndp:"); 1283 cp = &outpack[ICMP_MINLEN]; 1284 for (i = 0; i < datalen; ++i, ++cp) { 1285 if ((i % 16) == 8) 1286 (void)printf("\n\t"); 1287 (void)printf("%2x ", *cp); 1288 } 1289 break; 1290 } 1291 } 1292 } 1293 } else { 1294 /* 1295 * We've got something other than an ECHOREPLY. 1296 * See if it's a reply to something that we sent. 1297 * We can compare IP destination, protocol, 1298 * and ICMP type and ID. 1299 * 1300 * Only print all the error messages if we are running 1301 * as root to avoid leaking information not normally 1302 * available to those not running as root. 1303 */ 1304 memcpy(&oip_header_len, icmp_data_raw, sizeof(oip_header_len)); 1305 oip_header_len = (oip_header_len & 0x0f) << 2; 1306 memcpy(&oip, icmp_data_raw, oip_header_len); 1307 oicmp_raw = icmp_data_raw + oip_header_len; 1308 memcpy(&oicmp, oicmp_raw, offsetof(struct icmp, icmp_id) + 1309 sizeof(oicmp.icmp_id)); 1310 1311 if (((options & F_VERBOSE) && uid == 0) || 1312 (!(options & F_QUIET2) && 1313 (oip.ip_dst.s_addr == whereto.sin_addr.s_addr) && 1314 (oip.ip_p == IPPROTO_ICMP) && 1315 (oicmp.icmp_type == ICMP_ECHO) && 1316 (oicmp.icmp_id == ident))) { 1317 (void)printf("%zd bytes from %s: ", cc, 1318 pr_addr(from->sin_addr)); 1319 pr_icmph(&icp, &oip, oicmp_raw); 1320 } else 1321 return; 1322 } 1323 1324 /* Display any IP options */ 1325 cp = (u_char *)buf + sizeof(struct ip); 1326 1327 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp) 1328 switch (*cp) { 1329 case IPOPT_EOL: 1330 hlen = 0; 1331 break; 1332 case IPOPT_LSRR: 1333 case IPOPT_SSRR: 1334 (void)printf(*cp == IPOPT_LSRR ? 1335 "\nLSRR: " : "\nSSRR: "); 1336 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1; 1337 hlen -= 2; 1338 cp += 2; 1339 if (j >= INADDR_LEN && 1340 j <= hlen - (int)sizeof(struct ip)) { 1341 for (;;) { 1342 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1343 if (ina.s_addr == 0) 1344 (void)printf("\t0.0.0.0"); 1345 else 1346 (void)printf("\t%s", 1347 pr_addr(ina)); 1348 hlen -= INADDR_LEN; 1349 cp += INADDR_LEN - 1; 1350 j -= INADDR_LEN; 1351 if (j < INADDR_LEN) 1352 break; 1353 (void)putchar('\n'); 1354 } 1355 } else 1356 (void)printf("\t(truncated route)\n"); 1357 break; 1358 case IPOPT_RR: 1359 j = cp[IPOPT_OLEN]; /* get length */ 1360 i = cp[IPOPT_OFFSET]; /* and pointer */ 1361 hlen -= 2; 1362 cp += 2; 1363 if (i > j) 1364 i = j; 1365 i = i - IPOPT_MINOFF + 1; 1366 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) { 1367 old_rrlen = 0; 1368 continue; 1369 } 1370 if (i == old_rrlen 1371 && !bcmp((char *)cp, old_rr, i) 1372 && !(options & F_FLOOD)) { 1373 (void)printf("\t(same route)"); 1374 hlen -= i; 1375 cp += i; 1376 break; 1377 } 1378 old_rrlen = i; 1379 bcopy((char *)cp, old_rr, i); 1380 (void)printf("\nRR: "); 1381 if (i >= INADDR_LEN && 1382 i <= hlen - (int)sizeof(struct ip)) { 1383 for (;;) { 1384 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1385 if (ina.s_addr == 0) 1386 (void)printf("\t0.0.0.0"); 1387 else 1388 (void)printf("\t%s", 1389 pr_addr(ina)); 1390 hlen -= INADDR_LEN; 1391 cp += INADDR_LEN - 1; 1392 i -= INADDR_LEN; 1393 if (i < INADDR_LEN) 1394 break; 1395 (void)putchar('\n'); 1396 } 1397 } else 1398 (void)printf("\t(truncated route)"); 1399 break; 1400 case IPOPT_NOP: 1401 (void)printf("\nNOP"); 1402 break; 1403 default: 1404 (void)printf("\nunknown option %x", *cp); 1405 break; 1406 } 1407 if (!(options & F_FLOOD)) { 1408 (void)putchar('\n'); 1409 (void)fflush(stdout); 1410 } 1411} 1412 1413/* 1414 * status -- 1415 * Print out statistics when SIGINFO is received. 1416 */ 1417 1418static void 1419status(int sig __unused) 1420{ 1421 1422 siginfo_p = 1; 1423} 1424 1425static void 1426check_status(void) 1427{ 1428 1429 if (siginfo_p) { 1430 siginfo_p = 0; 1431 (void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)", 1432 nreceived, ntransmitted, 1433 ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0); 1434 if (nreceived && timing) 1435 (void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max", 1436 tmin, tsum / (nreceived + nrepeats), tmax); 1437 (void)fprintf(stderr, "\n"); 1438 } 1439} 1440 1441/* 1442 * finish -- 1443 * Print out statistics, and give up. 1444 */ 1445static void 1446finish(void) 1447{ 1448 1449 (void)signal(SIGINT, SIG_IGN); 1450 (void)signal(SIGALRM, SIG_IGN); 1451 (void)putchar('\n'); 1452 (void)fflush(stdout); 1453 (void)printf("--- %s ping statistics ---\n", hostname); 1454 (void)printf("%ld packets transmitted, ", ntransmitted); 1455 (void)printf("%ld packets received, ", nreceived); 1456 if (nrepeats) 1457 (void)printf("+%ld duplicates, ", nrepeats); 1458 if (ntransmitted) { 1459 if (nreceived > ntransmitted) 1460 (void)printf("-- somebody's printing up packets!"); 1461 else 1462 (void)printf("%.1f%% packet loss", 1463 ((ntransmitted - nreceived) * 100.0) / 1464 ntransmitted); 1465 } 1466 if (nrcvtimeout) 1467 (void)printf(", %ld packets out of wait time", nrcvtimeout); 1468 (void)putchar('\n'); 1469 if (nreceived && timing) { 1470 double n = nreceived + nrepeats; 1471 double avg = tsum / n; 1472 double vari = tsumsq / n - avg * avg; 1473 (void)printf( 1474 "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n", 1475 tmin, avg, tmax, sqrt(vari)); 1476 } 1477 1478 if (nreceived) 1479 exit(0); 1480 else 1481 exit(2); 1482} 1483 1484#ifdef notdef 1485static char *ttab[] = { 1486 "Echo Reply", /* ip + seq + udata */ 1487 "Dest Unreachable", /* net, host, proto, port, frag, sr + IP */ 1488 "Source Quench", /* IP */ 1489 "Redirect", /* redirect type, gateway, + IP */ 1490 "Echo", 1491 "Time Exceeded", /* transit, frag reassem + IP */ 1492 "Parameter Problem", /* pointer + IP */ 1493 "Timestamp", /* id + seq + three timestamps */ 1494 "Timestamp Reply", /* " */ 1495 "Info Request", /* id + sq */ 1496 "Info Reply" /* " */ 1497}; 1498#endif 1499 1500/* 1501 * pr_icmph -- 1502 * Print a descriptive string about an ICMP header. 1503 */ 1504static void 1505pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw) 1506{ 1507 1508 switch(icp->icmp_type) { 1509 case ICMP_ECHOREPLY: 1510 (void)printf("Echo Reply\n"); 1511 /* XXX ID + Seq + Data */ 1512 break; 1513 case ICMP_UNREACH: 1514 switch(icp->icmp_code) { 1515 case ICMP_UNREACH_NET: 1516 (void)printf("Destination Net Unreachable\n"); 1517 break; 1518 case ICMP_UNREACH_HOST: 1519 (void)printf("Destination Host Unreachable\n"); 1520 break; 1521 case ICMP_UNREACH_PROTOCOL: 1522 (void)printf("Destination Protocol Unreachable\n"); 1523 break; 1524 case ICMP_UNREACH_PORT: 1525 (void)printf("Destination Port Unreachable\n"); 1526 break; 1527 case ICMP_UNREACH_NEEDFRAG: 1528 (void)printf("frag needed and DF set (MTU %d)\n", 1529 ntohs(icp->icmp_nextmtu)); 1530 break; 1531 case ICMP_UNREACH_SRCFAIL: 1532 (void)printf("Source Route Failed\n"); 1533 break; 1534 case ICMP_UNREACH_FILTER_PROHIB: 1535 (void)printf("Communication prohibited by filter\n"); 1536 break; 1537 default: 1538 (void)printf("Dest Unreachable, Bad Code: %d\n", 1539 icp->icmp_code); 1540 break; 1541 } 1542 /* Print returned IP header information */ 1543 pr_retip(oip, oicmp_raw); 1544 break; 1545 case ICMP_SOURCEQUENCH: 1546 (void)printf("Source Quench\n"); 1547 pr_retip(oip, oicmp_raw); 1548 break; 1549 case ICMP_REDIRECT: 1550 switch(icp->icmp_code) { 1551 case ICMP_REDIRECT_NET: 1552 (void)printf("Redirect Network"); 1553 break; 1554 case ICMP_REDIRECT_HOST: 1555 (void)printf("Redirect Host"); 1556 break; 1557 case ICMP_REDIRECT_TOSNET: 1558 (void)printf("Redirect Type of Service and Network"); 1559 break; 1560 case ICMP_REDIRECT_TOSHOST: 1561 (void)printf("Redirect Type of Service and Host"); 1562 break; 1563 default: 1564 (void)printf("Redirect, Bad Code: %d", icp->icmp_code); 1565 break; 1566 } 1567 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr)); 1568 pr_retip(oip, oicmp_raw); 1569 break; 1570 case ICMP_ECHO: 1571 (void)printf("Echo Request\n"); 1572 /* XXX ID + Seq + Data */ 1573 break; 1574 case ICMP_TIMXCEED: 1575 switch(icp->icmp_code) { 1576 case ICMP_TIMXCEED_INTRANS: 1577 (void)printf("Time to live exceeded\n"); 1578 break; 1579 case ICMP_TIMXCEED_REASS: 1580 (void)printf("Frag reassembly time exceeded\n"); 1581 break; 1582 default: 1583 (void)printf("Time exceeded, Bad Code: %d\n", 1584 icp->icmp_code); 1585 break; 1586 } 1587 pr_retip(oip, oicmp_raw); 1588 break; 1589 case ICMP_PARAMPROB: 1590 (void)printf("Parameter problem: pointer = 0x%02x\n", 1591 icp->icmp_hun.ih_pptr); 1592 pr_retip(oip, oicmp_raw); 1593 break; 1594 case ICMP_TSTAMP: 1595 (void)printf("Timestamp\n"); 1596 /* XXX ID + Seq + 3 timestamps */ 1597 break; 1598 case ICMP_TSTAMPREPLY: 1599 (void)printf("Timestamp Reply\n"); 1600 /* XXX ID + Seq + 3 timestamps */ 1601 break; 1602 case ICMP_IREQ: 1603 (void)printf("Information Request\n"); 1604 /* XXX ID + Seq */ 1605 break; 1606 case ICMP_IREQREPLY: 1607 (void)printf("Information Reply\n"); 1608 /* XXX ID + Seq */ 1609 break; 1610 case ICMP_MASKREQ: 1611 (void)printf("Address Mask Request\n"); 1612 break; 1613 case ICMP_MASKREPLY: 1614 (void)printf("Address Mask Reply\n"); 1615 break; 1616 case ICMP_ROUTERADVERT: 1617 (void)printf("Router Advertisement\n"); 1618 break; 1619 case ICMP_ROUTERSOLICIT: 1620 (void)printf("Router Solicitation\n"); 1621 break; 1622 default: 1623 (void)printf("Bad ICMP type: %d\n", icp->icmp_type); 1624 } 1625} 1626 1627/* 1628 * pr_iph -- 1629 * Print an IP header with options. 1630 */ 1631static void 1632pr_iph(struct ip *ip) 1633{ 1634 struct in_addr ina; 1635 u_char *cp; 1636 int hlen; 1637 1638 hlen = ip->ip_hl << 2; 1639 cp = (u_char *)ip + 20; /* point to options */ 1640 1641 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\n"); 1642 (void)printf(" %1x %1x %02x %04x %04x", 1643 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len), 1644 ntohs(ip->ip_id)); 1645 (void)printf(" %1lx %04lx", 1646 (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13, 1647 (u_long) ntohl(ip->ip_off) & 0x1fff); 1648 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, 1649 ntohs(ip->ip_sum)); 1650 memcpy(&ina, &ip->ip_src.s_addr, sizeof ina); 1651 (void)printf(" %s ", inet_ntoa(ina)); 1652 memcpy(&ina, &ip->ip_dst.s_addr, sizeof ina); 1653 (void)printf(" %s ", inet_ntoa(ina)); 1654 /* dump any option bytes */ 1655 while (hlen-- > 20) { 1656 (void)printf("%02x", *cp++); 1657 } 1658 (void)putchar('\n'); 1659} 1660 1661/* 1662 * pr_addr -- 1663 * Return an ascii host address as a dotted quad and optionally with 1664 * a hostname. 1665 */ 1666static char * 1667pr_addr(struct in_addr ina) 1668{ 1669 struct hostent *hp; 1670 static char buf[16 + 3 + MAXHOSTNAMELEN]; 1671 1672 if (options & F_NUMERIC) 1673 return inet_ntoa(ina); 1674 1675 hp = cap_gethostbyaddr(capdns, (char *)&ina, 4, AF_INET); 1676 1677 if (hp == NULL) 1678 return inet_ntoa(ina); 1679 1680 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name, 1681 inet_ntoa(ina)); 1682 return(buf); 1683} 1684 1685/* 1686 * pr_retip -- 1687 * Dump some info on a returned (via ICMP) IP packet. 1688 */ 1689static void 1690pr_retip(struct ip *ip, const u_char *cp) 1691{ 1692 pr_iph(ip); 1693 1694 if (ip->ip_p == 6) 1695 (void)printf("TCP: from port %u, to port %u (decimal)\n", 1696 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1697 else if (ip->ip_p == 17) 1698 (void)printf("UDP: from port %u, to port %u (decimal)\n", 1699 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1700} 1701 1702static char * 1703pr_ntime(n_time timestamp) 1704{ 1705 static char buf[11]; 1706 int hour, min, sec; 1707 1708 sec = ntohl(timestamp) / 1000; 1709 hour = sec / 60 / 60; 1710 min = (sec % (60 * 60)) / 60; 1711 sec = (sec % (60 * 60)) % 60; 1712 1713 (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec); 1714 1715 return (buf); 1716} 1717 1718static void 1719fill(char *bp, char *patp) 1720{ 1721 char *cp; 1722 int pat[16]; 1723 u_int ii, jj, kk; 1724 1725 for (cp = patp; *cp; cp++) { 1726 if (!isxdigit(*cp)) 1727 errx(EX_USAGE, 1728 "patterns must be specified as hex digits"); 1729 1730 } 1731 ii = sscanf(patp, 1732 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", 1733 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], 1734 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], 1735 &pat[13], &pat[14], &pat[15]); 1736 1737 if (ii > 0) 1738 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii) 1739 for (jj = 0; jj < ii; ++jj) 1740 bp[jj + kk] = pat[jj]; 1741 if (!(options & F_QUIET)) { 1742 (void)printf("PATTERN: 0x"); 1743 for (jj = 0; jj < ii; ++jj) 1744 (void)printf("%02x", bp[jj] & 0xFF); 1745 (void)printf("\n"); 1746 } 1747} 1748 1749static cap_channel_t * 1750capdns_setup(void) 1751{ 1752 cap_channel_t *capcas, *capdnsloc; 1753#ifdef WITH_CASPER 1754 const char *types[2]; 1755 int families[1]; 1756#endif 1757 capcas = cap_init(); 1758 if (capcas == NULL) 1759 err(1, "unable to create casper process"); 1760 capdnsloc = cap_service_open(capcas, "system.dns"); 1761 /* Casper capability no longer needed. */ 1762 cap_close(capcas); 1763 if (capdnsloc == NULL) 1764 err(1, "unable to open system.dns service"); 1765#ifdef WITH_CASPER 1766 types[0] = "NAME2ADDR"; 1767 types[1] = "ADDR2NAME"; 1768 if (cap_dns_type_limit(capdnsloc, types, 2) < 0) 1769 err(1, "unable to limit access to system.dns service"); 1770 families[0] = AF_INET; 1771 if (cap_dns_family_limit(capdnsloc, families, 1) < 0) 1772 err(1, "unable to limit access to system.dns service"); 1773#endif 1774 return (capdnsloc); 1775} 1776