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 37 static 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 43 static 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)) 125 126 struct tv32 { 127 int32_t tv32_sec; 128 int32_t tv32_nsec; 129 }; 130 131 /* various options */ 132 static 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 #define F_DOT 0x1000000 162 163 /* 164 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum 165 * number of received sequence numbers we can keep track of. Change 128 166 * to 8192 for complete accuracy... 167 */ 168 #define MAX_DUP_CHK (8 * 128) 169 static int mx_dup_ck = MAX_DUP_CHK; 170 static char rcvd_tbl[MAX_DUP_CHK / 8]; 171 172 static struct sockaddr_in whereto; /* who to ping */ 173 static int datalen = DEFDATALEN; 174 static int maxpayload; 175 static int ssend; /* send socket file descriptor */ 176 static int srecv; /* receive socket file descriptor */ 177 static u_char outpackhdr[IP_MAXPACKET], *outpack; 178 static char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */ 179 static char BSPACE = '\b'; /* characters written for flood */ 180 static const char *DOT = "."; 181 static size_t DOTlen = 1; 182 static size_t DOTidx = 0; 183 static char *hostname; 184 static char *shostname; 185 static int ident; /* process id to identify our packets */ 186 static int uid; /* cached uid for micro-optimization */ 187 static u_char icmp_type = ICMP_ECHO; 188 static u_char icmp_type_rsp = ICMP_ECHOREPLY; 189 static int phdr_len = 0; 190 static int send_len; 191 192 /* counters */ 193 static long nmissedmax; /* max value of ntransmitted - nreceived - 1 */ 194 static long npackets; /* max packets to transmit */ 195 static long nreceived; /* # of packets we got back */ 196 static long nrepeats; /* number of duplicates */ 197 static long ntransmitted; /* sequence # for outbound packets = #sent */ 198 static long snpackets; /* max packets to transmit in one sweep */ 199 static long sntransmitted; /* # of packets we sent in this sweep */ 200 static int sweepmax; /* max value of payload in sweep */ 201 static int sweepmin = 0; /* start value of payload in sweep */ 202 static int sweepincr = 1; /* payload increment in sweep */ 203 static int interval = 1000; /* interval between packets, ms */ 204 static int waittime = MAXWAIT; /* timeout for each packet */ 205 static long nrcvtimeout = 0; /* # of packets we got back after waittime */ 206 207 /* timing */ 208 static int timing; /* flag to do timing */ 209 static double tmin = 999999999.0; /* minimum round trip time */ 210 static double tmax = 0.0; /* maximum round trip time */ 211 static double tsum = 0.0; /* sum of all times, for doing average */ 212 static double tsumsq = 0.0; /* sum of all times squared, for std. dev. */ 213 214 /* nonzero if we've been told to finish up */ 215 static volatile sig_atomic_t finish_up; 216 static volatile sig_atomic_t siginfo_p; 217 218 static cap_channel_t *capdns; 219 220 static void fill(char *, char *); 221 static cap_channel_t *capdns_setup(void); 222 static void check_status(void); 223 static void finish(void) __dead2; 224 static void pinger(void); 225 static char *pr_addr(struct in_addr); 226 static char *pr_ntime(n_time); 227 static void pr_icmph(struct icmp *, struct ip *, const u_char *const); 228 static void pr_iph(struct ip *); 229 static void pr_pack(char *, ssize_t, struct sockaddr_in *, struct timespec *); 230 static void pr_retip(struct ip *, const u_char *); 231 static void status(int); 232 static void stopit(int); 233 234 int 235 ping(int argc, char *const *argv) 236 { 237 struct sockaddr_in from, sock_in; 238 struct in_addr ifaddr; 239 struct timespec last, intvl; 240 struct iovec iov; 241 struct msghdr msg; 242 struct sigaction si_sa; 243 size_t sz; 244 u_char *datap, packet[IP_MAXPACKET] __aligned(4); 245 const char *errstr; 246 char *ep, *source, *target, *payload; 247 struct hostent *hp; 248 #ifdef IPSEC_POLICY_IPSEC 249 char *policy_in, *policy_out; 250 #endif 251 struct sockaddr_in *to; 252 double t; 253 u_long alarmtimeout; 254 long long ltmp; 255 int almost_done, ch, df, hold, i, icmp_len, mib[4], preload; 256 int ssend_errno, srecv_errno, tos, ttl, pcp; 257 char ctrl[CMSG_SPACE(sizeof(struct timespec))]; 258 char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN]; 259 #ifdef IP_OPTIONS 260 char rspace[MAX_IPOPTLEN]; /* record route space */ 261 #endif 262 unsigned char loop, mttl; 263 264 payload = source = NULL; 265 #ifdef IPSEC_POLICY_IPSEC 266 policy_in = policy_out = NULL; 267 #endif 268 cap_rights_t rights; 269 270 options |= F_NUMERIC; 271 272 /* 273 * Do the stuff that we need root priv's for *first*, and 274 * then drop our setuid bit. Save error reporting for 275 * after arg parsing. 276 * 277 * Historicaly ping was using one socket 's' for sending and for 278 * receiving. After capsicum(4) related changes we use two 279 * sockets. It was done for special ping use case - when user 280 * issue ping on multicast or broadcast address replies come 281 * from different addresses, not from the address we 282 * connect(2)'ed to, and send socket do not receive those 283 * packets. 284 */ 285 ssend = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 286 ssend_errno = errno; 287 srecv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 288 srecv_errno = errno; 289 290 if (setuid(getuid()) != 0) 291 err(EX_NOPERM, "setuid() failed"); 292 uid = getuid(); 293 294 if (ssend < 0) { 295 errno = ssend_errno; 296 err(EX_OSERR, "ssend socket"); 297 } 298 299 if (srecv < 0) { 300 errno = srecv_errno; 301 err(EX_OSERR, "srecv socket"); 302 } 303 304 alarmtimeout = df = preload = tos = pcp = 0; 305 306 outpack = outpackhdr + sizeof(struct ip); 307 while ((ch = getopt(argc, argv, PING4OPTS)) != -1) { 308 switch(ch) { 309 case '.': 310 options |= F_DOT; 311 if (optarg != NULL) { 312 DOT = optarg; 313 DOTlen = strlen(optarg); 314 } 315 break; 316 case '4': 317 /* This option is processed in main(). */ 318 break; 319 case 'A': 320 options |= F_MISSED; 321 break; 322 case 'a': 323 options |= F_AUDIBLE; 324 break; 325 case 'C': 326 options |= F_IP_VLAN_PCP; 327 ltmp = strtonum(optarg, -1, 7, &errstr); 328 if (errstr != NULL) 329 errx(EX_USAGE, "invalid PCP: `%s'", optarg); 330 pcp = ltmp; 331 break; 332 case 'c': 333 ltmp = strtonum(optarg, 1, LONG_MAX, &errstr); 334 if (errstr != NULL) 335 errx(EX_USAGE, 336 "invalid count of packets to transmit: `%s'", 337 optarg); 338 npackets = (long)ltmp; 339 break; 340 case 'D': 341 options |= F_HDRINCL; 342 df = 1; 343 break; 344 case 'd': 345 options |= F_SO_DEBUG; 346 break; 347 case 'f': 348 if (uid) { 349 errno = EPERM; 350 err(EX_NOPERM, "-f flag"); 351 } 352 options |= F_FLOOD; 353 options |= F_DOT; 354 setbuf(stdout, (char *)NULL); 355 break; 356 case 'G': /* Maximum packet size for ping sweep */ 357 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 358 if (errstr != NULL) { 359 errx(EX_USAGE, "invalid packet size: `%s'", 360 optarg); 361 } 362 sweepmax = (int)ltmp; 363 if (uid != 0 && sweepmax > DEFDATALEN) { 364 errc(EX_NOPERM, EPERM, 365 "packet size too large: %d > %u", 366 sweepmax, DEFDATALEN); 367 } 368 options |= F_SWEEP; 369 break; 370 case 'g': /* Minimum packet size for ping sweep */ 371 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 372 if (errstr != NULL) { 373 errx(EX_USAGE, "invalid packet size: `%s'", 374 optarg); 375 } 376 sweepmin = (int)ltmp; 377 if (uid != 0 && sweepmin > DEFDATALEN) { 378 errc(EX_NOPERM, EPERM, 379 "packet size too large: %d > %u", 380 sweepmin, DEFDATALEN); 381 } 382 options |= F_SWEEP; 383 break; 384 case 'H': 385 options &= ~F_NUMERIC; 386 break; 387 case 'h': /* Packet size increment for ping sweep */ 388 ltmp = strtonum(optarg, 1, INT_MAX, &errstr); 389 if (errstr != NULL) { 390 errx(EX_USAGE, "invalid packet size: `%s'", 391 optarg); 392 } 393 sweepincr = (int)ltmp; 394 if (uid != 0 && sweepincr > DEFDATALEN) { 395 errc(EX_NOPERM, EPERM, 396 "packet size too large: %d > %u", 397 sweepincr, DEFDATALEN); 398 } 399 options |= F_SWEEP; 400 break; 401 case 'I': /* multicast interface */ 402 if (inet_aton(optarg, &ifaddr) == 0) 403 errx(EX_USAGE, 404 "invalid multicast interface: `%s'", 405 optarg); 406 options |= F_MIF; 407 break; 408 case 'i': /* wait between sending packets */ 409 t = strtod(optarg, &ep) * 1000.0; 410 if (*ep || ep == optarg || t > (double)INT_MAX) 411 errx(EX_USAGE, "invalid timing interval: `%s'", 412 optarg); 413 options |= F_INTERVAL; 414 interval = (int)t; 415 if (uid && interval < 1000) { 416 errno = EPERM; 417 err(EX_NOPERM, "-i interval too short"); 418 } 419 break; 420 case 'L': 421 options |= F_NOLOOP; 422 loop = 0; 423 break; 424 case 'l': 425 ltmp = strtonum(optarg, 0, INT_MAX, &errstr); 426 if (errstr != NULL) 427 errx(EX_USAGE, 428 "invalid preload value: `%s'", optarg); 429 if (uid) { 430 errno = EPERM; 431 err(EX_NOPERM, "-l flag"); 432 } 433 preload = (int)ltmp; 434 break; 435 case 'M': 436 switch(optarg[0]) { 437 case 'M': 438 case 'm': 439 options |= F_MASK; 440 break; 441 case 'T': 442 case 't': 443 options |= F_TIME; 444 break; 445 default: 446 errx(EX_USAGE, "invalid message: `%c'", optarg[0]); 447 break; 448 } 449 break; 450 case 'm': /* TTL */ 451 ltmp = strtonum(optarg, 0, MAXTTL, &errstr); 452 if (errstr != NULL) 453 errx(EX_USAGE, "invalid TTL: `%s'", optarg); 454 ttl = (int)ltmp; 455 options |= F_TTL; 456 break; 457 case 'n': 458 options |= F_NUMERIC; 459 break; 460 case 'o': 461 options |= F_ONCE; 462 break; 463 #ifdef IPSEC 464 #ifdef IPSEC_POLICY_IPSEC 465 case 'P': 466 options |= F_POLICY; 467 if (!strncmp("in", optarg, 2)) 468 policy_in = strdup(optarg); 469 else if (!strncmp("out", optarg, 3)) 470 policy_out = strdup(optarg); 471 else 472 errx(1, "invalid security policy"); 473 break; 474 #endif /*IPSEC_POLICY_IPSEC*/ 475 #endif /*IPSEC*/ 476 case 'p': /* fill buffer with user pattern */ 477 options |= F_PINGFILLED; 478 payload = optarg; 479 break; 480 case 'Q': 481 options |= F_QUIET2; 482 break; 483 case 'q': 484 options |= F_QUIET; 485 break; 486 case 'R': 487 options |= F_RROUTE; 488 break; 489 case 'r': 490 options |= F_SO_DONTROUTE; 491 break; 492 case 'S': 493 source = optarg; 494 break; 495 case 's': /* size of packet to send */ 496 ltmp = strtonum(optarg, 0, INT_MAX, &errstr); 497 if (errstr != NULL) 498 errx(EX_USAGE, "invalid packet size: `%s'", 499 optarg); 500 datalen = (int)ltmp; 501 if (uid != 0 && datalen > DEFDATALEN) { 502 errno = EPERM; 503 err(EX_NOPERM, 504 "packet size too large: %d > %u", 505 datalen, DEFDATALEN); 506 } 507 break; 508 case 'T': /* multicast TTL */ 509 ltmp = strtonum(optarg, 0, MAXTTL, &errstr); 510 if (errstr != NULL) 511 errx(EX_USAGE, "invalid multicast TTL: `%s'", 512 optarg); 513 mttl = (unsigned char)ltmp; 514 options |= F_MTTL; 515 break; 516 case 't': 517 alarmtimeout = strtoul(optarg, &ep, 0); 518 if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX)) 519 errx(EX_USAGE, "invalid timeout: `%s'", 520 optarg); 521 if (alarmtimeout > MAXALARM) 522 errx(EX_USAGE, "invalid timeout: `%s' > %d", 523 optarg, MAXALARM); 524 { 525 struct itimerval itv; 526 527 timerclear(&itv.it_interval); 528 timerclear(&itv.it_value); 529 itv.it_value.tv_sec = (time_t)alarmtimeout; 530 if (setitimer(ITIMER_REAL, &itv, NULL) != 0) 531 err(1, "setitimer"); 532 } 533 break; 534 case 'v': 535 options |= F_VERBOSE; 536 break; 537 case 'W': /* wait ms for answer */ 538 t = strtod(optarg, &ep); 539 if (*ep || ep == optarg || t > (double)INT_MAX) 540 errx(EX_USAGE, "invalid timing interval: `%s'", 541 optarg); 542 options |= F_WAITTIME; 543 waittime = (int)t; 544 break; 545 case 'z': 546 options |= F_HDRINCL; 547 ltmp = strtol(optarg, &ep, 0); 548 if (*ep || ep == optarg || ltmp > MAXTOS || ltmp < 0) 549 errx(EX_USAGE, "invalid TOS: `%s'", optarg); 550 tos = ltmp; 551 break; 552 default: 553 usage(); 554 } 555 } 556 557 if (argc - optind != 1) 558 usage(); 559 target = argv[optind]; 560 561 switch (options & (F_MASK|F_TIME)) { 562 case 0: break; 563 case F_MASK: 564 icmp_type = ICMP_MASKREQ; 565 icmp_type_rsp = ICMP_MASKREPLY; 566 phdr_len = MASK_LEN; 567 if (!(options & F_QUIET)) 568 (void)printf("ICMP_MASKREQ\n"); 569 break; 570 case F_TIME: 571 icmp_type = ICMP_TSTAMP; 572 icmp_type_rsp = ICMP_TSTAMPREPLY; 573 phdr_len = TS_LEN; 574 if (!(options & F_QUIET)) 575 (void)printf("ICMP_TSTAMP\n"); 576 break; 577 default: 578 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive."); 579 break; 580 } 581 icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len; 582 if (options & F_RROUTE) 583 icmp_len += MAX_IPOPTLEN; 584 maxpayload = IP_MAXPACKET - icmp_len; 585 if (datalen > maxpayload) 586 errx(EX_USAGE, "packet size too large: %d > %d", datalen, 587 maxpayload); 588 send_len = icmp_len + datalen; 589 datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN]; 590 if (options & F_PINGFILLED) { 591 fill((char *)datap, payload); 592 } 593 capdns = capdns_setup(); 594 if (source) { 595 bzero((char *)&sock_in, sizeof(sock_in)); 596 sock_in.sin_family = AF_INET; 597 if (inet_aton(source, &sock_in.sin_addr) != 0) { 598 shostname = source; 599 } else { 600 hp = cap_gethostbyname2(capdns, source, AF_INET); 601 if (!hp) 602 errx(EX_NOHOST, "cannot resolve %s: %s", 603 source, hstrerror(h_errno)); 604 605 sock_in.sin_len = sizeof sock_in; 606 if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) || 607 hp->h_length < 0) 608 errx(1, "gethostbyname2: illegal address"); 609 memcpy(&sock_in.sin_addr, hp->h_addr_list[0], 610 sizeof(sock_in.sin_addr)); 611 (void)strncpy(snamebuf, hp->h_name, 612 sizeof(snamebuf) - 1); 613 snamebuf[sizeof(snamebuf) - 1] = '\0'; 614 shostname = snamebuf; 615 } 616 if (bind(ssend, (struct sockaddr *)&sock_in, sizeof sock_in) == 617 -1) 618 err(1, "bind"); 619 } 620 621 bzero(&whereto, sizeof(whereto)); 622 to = &whereto; 623 to->sin_family = AF_INET; 624 to->sin_len = sizeof *to; 625 if (inet_aton(target, &to->sin_addr) != 0) { 626 hostname = target; 627 } else { 628 hp = cap_gethostbyname2(capdns, target, AF_INET); 629 if (!hp) 630 errx(EX_NOHOST, "cannot resolve %s: %s", 631 target, hstrerror(h_errno)); 632 633 if ((unsigned)hp->h_length > sizeof(to->sin_addr)) 634 errx(1, "gethostbyname2 returned an illegal address"); 635 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr); 636 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); 637 hnamebuf[sizeof(hnamebuf) - 1] = '\0'; 638 hostname = hnamebuf; 639 } 640 641 /* From now on we will use only reverse DNS lookups. */ 642 #ifdef WITH_CASPER 643 if (capdns != NULL) { 644 const char *types[1]; 645 646 types[0] = "ADDR2NAME"; 647 if (cap_dns_type_limit(capdns, types, 1) < 0) 648 err(1, "unable to limit access to system.dns service"); 649 } 650 #endif 651 if (connect(ssend, (struct sockaddr *)&whereto, sizeof(whereto)) != 0) 652 err(1, "connect"); 653 654 if (options & F_FLOOD && options & F_INTERVAL) 655 errx(EX_USAGE, "-f and -i: incompatible options"); 656 657 if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 658 errx(EX_USAGE, 659 "-f flag cannot be used with multicast destination"); 660 if (options & (F_MIF | F_NOLOOP | F_MTTL) 661 && !IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 662 errx(EX_USAGE, 663 "-I, -L, -T flags cannot be used with unicast destination"); 664 665 if (datalen >= TIMEVAL_LEN) /* can we time transfer */ 666 timing = 1; 667 668 if ((options & (F_PINGFILLED | F_SWEEP)) == 0) 669 for (i = TIMEVAL_LEN; i < datalen; ++i) 670 *datap++ = i; 671 672 ident = getpid() & 0xFFFF; 673 674 hold = 1; 675 if (options & F_SO_DEBUG) { 676 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold, 677 sizeof(hold)); 678 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold, 679 sizeof(hold)); 680 } 681 if (options & F_SO_DONTROUTE) 682 (void)setsockopt(ssend, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, 683 sizeof(hold)); 684 if (options & F_IP_VLAN_PCP) { 685 (void)setsockopt(ssend, IPPROTO_IP, IP_VLAN_PCP, (char *)&pcp, 686 sizeof(pcp)); 687 } 688 #ifdef IPSEC 689 #ifdef IPSEC_POLICY_IPSEC 690 if (options & F_POLICY) { 691 char *buf; 692 if (policy_in != NULL) { 693 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 694 if (buf == NULL) 695 errx(EX_CONFIG, "%s", ipsec_strerror()); 696 if (setsockopt(srecv, IPPROTO_IP, IP_IPSEC_POLICY, 697 buf, ipsec_get_policylen(buf)) < 0) 698 err(EX_CONFIG, 699 "ipsec policy cannot be configured"); 700 free(buf); 701 } 702 703 if (policy_out != NULL) { 704 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 705 if (buf == NULL) 706 errx(EX_CONFIG, "%s", ipsec_strerror()); 707 if (setsockopt(ssend, IPPROTO_IP, IP_IPSEC_POLICY, 708 buf, ipsec_get_policylen(buf)) < 0) 709 err(EX_CONFIG, 710 "ipsec policy cannot be configured"); 711 free(buf); 712 } 713 } 714 #endif /*IPSEC_POLICY_IPSEC*/ 715 #endif /*IPSEC*/ 716 717 if (options & F_HDRINCL) { 718 struct ip ip; 719 720 memcpy(&ip, outpackhdr, sizeof(ip)); 721 if (!(options & (F_TTL | F_MTTL))) { 722 mib[0] = CTL_NET; 723 mib[1] = PF_INET; 724 mib[2] = IPPROTO_IP; 725 mib[3] = IPCTL_DEFTTL; 726 sz = sizeof(ttl); 727 if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1) 728 err(1, "sysctl(net.inet.ip.ttl)"); 729 } 730 setsockopt(ssend, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold)); 731 ip.ip_v = IPVERSION; 732 ip.ip_hl = sizeof(struct ip) >> 2; 733 ip.ip_tos = tos; 734 ip.ip_id = 0; 735 ip.ip_off = htons(df ? IP_DF : 0); 736 ip.ip_ttl = ttl; 737 ip.ip_p = IPPROTO_ICMP; 738 ip.ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY; 739 ip.ip_dst = to->sin_addr; 740 memcpy(outpackhdr, &ip, sizeof(ip)); 741 } 742 743 /* 744 * Here we enter capability mode. Further down access to global 745 * namespaces (e.g filesystem) is restricted (see capsicum(4)). 746 * We must connect(2) our socket before this point. 747 */ 748 caph_cache_catpages(); 749 if (caph_enter_casper() < 0) 750 err(1, "caph_enter_casper"); 751 752 cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT); 753 if (caph_rights_limit(srecv, &rights) < 0) 754 err(1, "cap_rights_limit srecv"); 755 cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT); 756 if (caph_rights_limit(ssend, &rights) < 0) 757 err(1, "cap_rights_limit ssend"); 758 759 /* record route option */ 760 if (options & F_RROUTE) { 761 #ifdef IP_OPTIONS 762 bzero(rspace, sizeof(rspace)); 763 rspace[IPOPT_OPTVAL] = IPOPT_RR; 764 rspace[IPOPT_OLEN] = sizeof(rspace) - 1; 765 rspace[IPOPT_OFFSET] = IPOPT_MINOFF; 766 rspace[sizeof(rspace) - 1] = IPOPT_EOL; 767 if (setsockopt(ssend, IPPROTO_IP, IP_OPTIONS, rspace, 768 sizeof(rspace)) < 0) 769 err(EX_OSERR, "setsockopt IP_OPTIONS"); 770 #else 771 errx(EX_UNAVAILABLE, 772 "record route not available in this implementation"); 773 #endif /* IP_OPTIONS */ 774 } 775 776 if (options & F_TTL) { 777 if (setsockopt(ssend, IPPROTO_IP, IP_TTL, &ttl, 778 sizeof(ttl)) < 0) { 779 err(EX_OSERR, "setsockopt IP_TTL"); 780 } 781 } 782 if (options & F_NOLOOP) { 783 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, 784 sizeof(loop)) < 0) { 785 err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP"); 786 } 787 } 788 if (options & F_MTTL) { 789 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_TTL, &mttl, 790 sizeof(mttl)) < 0) { 791 err(EX_OSERR, "setsockopt IP_MULTICAST_TTL"); 792 } 793 } 794 if (options & F_MIF) { 795 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr, 796 sizeof(ifaddr)) < 0) { 797 err(EX_OSERR, "setsockopt IP_MULTICAST_IF"); 798 } 799 } 800 #ifdef SO_TIMESTAMP 801 { 802 int on = 1; 803 int ts_clock = SO_TS_MONOTONIC; 804 if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on, 805 sizeof(on)) < 0) 806 err(EX_OSERR, "setsockopt SO_TIMESTAMP"); 807 if (setsockopt(srecv, SOL_SOCKET, SO_TS_CLOCK, &ts_clock, 808 sizeof(ts_clock)) < 0) 809 err(EX_OSERR, "setsockopt SO_TS_CLOCK"); 810 } 811 #endif 812 if (sweepmax) { 813 if (sweepmin > sweepmax) 814 errx(EX_USAGE, 815 "Maximum packet size must be no less than the minimum packet size"); 816 817 if (sweepmax > maxpayload - TIMEVAL_LEN) 818 errx(EX_USAGE, "Invalid sweep maximum"); 819 820 if (datalen != DEFDATALEN) 821 errx(EX_USAGE, 822 "Packet size and ping sweep are mutually exclusive"); 823 824 if (npackets > 0) { 825 snpackets = npackets; 826 npackets = 0; 827 } else 828 snpackets = 1; 829 datalen = sweepmin; 830 send_len = icmp_len + sweepmin; 831 } 832 if (options & F_SWEEP && !sweepmax) 833 errx(EX_USAGE, "Maximum sweep size must be specified"); 834 835 /* 836 * When pinging the broadcast address, you can get a lot of answers. 837 * Doing something so evil is useful if you are trying to stress the 838 * ethernet, or just want to fill the arp cache to get some stuff for 839 * /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast 840 * or multicast pings if they wish. 841 */ 842 843 /* 844 * XXX receive buffer needs undetermined space for mbuf overhead 845 * as well. 846 */ 847 hold = IP_MAXPACKET + 128; 848 (void)setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold, 849 sizeof(hold)); 850 /* CAP_SETSOCKOPT removed */ 851 cap_rights_init(&rights, CAP_RECV, CAP_EVENT); 852 if (caph_rights_limit(srecv, &rights) < 0) 853 err(1, "cap_rights_limit srecv setsockopt"); 854 if (uid == 0) 855 (void)setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, (char *)&hold, 856 sizeof(hold)); 857 /* CAP_SETSOCKOPT removed */ 858 cap_rights_init(&rights, CAP_SEND); 859 if (caph_rights_limit(ssend, &rights) < 0) 860 err(1, "cap_rights_limit ssend setsockopt"); 861 862 if (to->sin_family == AF_INET) { 863 (void)printf("PING %s (%s)", hostname, 864 inet_ntoa(to->sin_addr)); 865 if (source) 866 (void)printf(" from %s", shostname); 867 if (sweepmax) 868 (void)printf(": (%d ... %d) data bytes\n", 869 sweepmin, sweepmax); 870 else 871 (void)printf(": %d data bytes\n", datalen); 872 873 } else { 874 if (sweepmax) 875 (void)printf("PING %s: (%d ... %d) data bytes\n", 876 hostname, sweepmin, sweepmax); 877 else 878 (void)printf("PING %s: %d data bytes\n", hostname, datalen); 879 } 880 881 /* 882 * Use sigaction() instead of signal() to get unambiguous semantics, 883 * in particular with SA_RESTART not set. 884 */ 885 886 sigemptyset(&si_sa.sa_mask); 887 si_sa.sa_flags = 0; 888 889 si_sa.sa_handler = stopit; 890 if (sigaction(SIGINT, &si_sa, 0) == -1) { 891 err(EX_OSERR, "sigaction SIGINT"); 892 } 893 894 si_sa.sa_handler = status; 895 if (sigaction(SIGINFO, &si_sa, 0) == -1) { 896 err(EX_OSERR, "sigaction"); 897 } 898 899 if (alarmtimeout > 0) { 900 si_sa.sa_handler = stopit; 901 if (sigaction(SIGALRM, &si_sa, 0) == -1) 902 err(EX_OSERR, "sigaction SIGALRM"); 903 } 904 905 bzero(&msg, sizeof(msg)); 906 msg.msg_name = (caddr_t)&from; 907 msg.msg_iov = &iov; 908 msg.msg_iovlen = 1; 909 #ifdef SO_TIMESTAMP 910 msg.msg_control = (caddr_t)ctrl; 911 msg.msg_controllen = sizeof(ctrl); 912 #endif 913 iov.iov_base = packet; 914 iov.iov_len = IP_MAXPACKET; 915 916 if (preload == 0) 917 pinger(); /* send the first ping */ 918 else { 919 if (npackets != 0 && preload > npackets) 920 preload = npackets; 921 while (preload--) /* fire off them quickies */ 922 pinger(); 923 } 924 (void)clock_gettime(CLOCK_MONOTONIC, &last); 925 926 if (options & F_FLOOD) { 927 intvl.tv_sec = 0; 928 intvl.tv_nsec = 10000000; 929 } else { 930 intvl.tv_sec = interval / 1000; 931 intvl.tv_nsec = interval % 1000 * 1000000; 932 } 933 934 almost_done = 0; 935 while (!finish_up) { 936 struct timespec now, timeout; 937 fd_set rfds; 938 int n; 939 ssize_t cc; 940 941 check_status(); 942 if ((unsigned)srecv >= FD_SETSIZE) 943 errx(EX_OSERR, "descriptor too large"); 944 FD_ZERO(&rfds); 945 FD_SET(srecv, &rfds); 946 (void)clock_gettime(CLOCK_MONOTONIC, &now); 947 timespecadd(&last, &intvl, &timeout); 948 timespecsub(&timeout, &now, &timeout); 949 if (timeout.tv_sec < 0) 950 timespecclear(&timeout); 951 n = pselect(srecv + 1, &rfds, NULL, NULL, &timeout, NULL); 952 if (n < 0) 953 continue; /* Must be EINTR. */ 954 if (n == 1) { 955 struct timespec *tv = NULL; 956 #ifdef SO_TIMESTAMP 957 struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg); 958 #endif 959 msg.msg_namelen = sizeof(from); 960 if ((cc = recvmsg(srecv, &msg, 0)) < 0) { 961 if (errno == EINTR) 962 continue; 963 warn("recvmsg"); 964 continue; 965 } 966 /* If we have a 0 byte read from recvfrom continue */ 967 if (cc == 0) 968 continue; 969 #ifdef SO_TIMESTAMP 970 if (cmsg != NULL && 971 cmsg->cmsg_level == SOL_SOCKET && 972 cmsg->cmsg_type == SCM_TIMESTAMP && 973 cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) { 974 /* Copy to avoid alignment problems: */ 975 memcpy(&now, CMSG_DATA(cmsg), sizeof(now)); 976 tv = &now; 977 } 978 #endif 979 if (tv == NULL) { 980 (void)clock_gettime(CLOCK_MONOTONIC, &now); 981 tv = &now; 982 } 983 pr_pack((char *)packet, cc, &from, tv); 984 if ((options & F_ONCE && nreceived) || 985 (npackets && nreceived >= npackets)) 986 break; 987 } 988 if (n == 0 || options & F_FLOOD) { 989 if (sweepmax && sntransmitted == snpackets) { 990 if (datalen + sweepincr > sweepmax) 991 break; 992 for (i = 0; i < sweepincr; i++) 993 *datap++ = i; 994 datalen += sweepincr; 995 send_len = icmp_len + datalen; 996 sntransmitted = 0; 997 } 998 if (!npackets || ntransmitted < npackets) 999 pinger(); 1000 else { 1001 if (almost_done) 1002 break; 1003 almost_done = 1; 1004 intvl.tv_nsec = 0; 1005 if (nreceived) { 1006 intvl.tv_sec = 2 * tmax / 1000; 1007 if (!intvl.tv_sec) 1008 intvl.tv_sec = 1; 1009 } else { 1010 intvl.tv_sec = waittime / 1000; 1011 intvl.tv_nsec = waittime % 1000 * 1000000; 1012 } 1013 } 1014 (void)clock_gettime(CLOCK_MONOTONIC, &last); 1015 if (ntransmitted - nreceived - 1 > nmissedmax) { 1016 nmissedmax = ntransmitted - nreceived - 1; 1017 if (options & F_MISSED) 1018 (void)write(STDOUT_FILENO, &BBELL, 1); 1019 } 1020 } 1021 } 1022 finish(); 1023 /* NOTREACHED */ 1024 exit(0); /* Make the compiler happy */ 1025 } 1026 1027 /* 1028 * stopit -- 1029 * Set the global bit that causes the main loop to quit. 1030 * Do NOT call finish() from here, since finish() does far too much 1031 * to be called from a signal handler. 1032 */ 1033 void 1034 stopit(int sig __unused) 1035 { 1036 1037 /* 1038 * When doing reverse DNS lookups, the finish_up flag might not 1039 * be noticed for a while. Just exit if we get a second SIGINT. 1040 */ 1041 if (!(options & F_NUMERIC) && finish_up) 1042 _exit(nreceived ? 0 : 2); 1043 finish_up = 1; 1044 } 1045 1046 /* 1047 * pinger -- 1048 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet 1049 * will be added on by the kernel. The ID field is our UNIX process ID, 1050 * and the sequence number is an ascending integer. The first TIMEVAL_LEN 1051 * bytes of the data portion are used to hold a UNIX "timespec" struct in 1052 * host byte-order, to compute the round-trip time. 1053 */ 1054 static void 1055 pinger(void) 1056 { 1057 struct timespec now; 1058 struct tv32 tv32; 1059 struct icmp icp; 1060 int cc, i; 1061 u_char *packet; 1062 1063 packet = outpack; 1064 memcpy(&icp, outpack, ICMP_MINLEN + phdr_len); 1065 icp.icmp_type = icmp_type; 1066 icp.icmp_code = 0; 1067 icp.icmp_cksum = 0; 1068 icp.icmp_seq = htons(ntransmitted); 1069 icp.icmp_id = ident; /* ID */ 1070 1071 CLR(ntransmitted % mx_dup_ck); 1072 1073 if ((options & F_TIME) || timing) { 1074 (void)clock_gettime(CLOCK_MONOTONIC, &now); 1075 /* 1076 * Truncate seconds down to 32 bits in order 1077 * to fit the timestamp within 8 bytes of the 1078 * packet. We're only concerned with 1079 * durations, not absolute times. 1080 */ 1081 tv32.tv32_sec = (uint32_t)htonl(now.tv_sec); 1082 tv32.tv32_nsec = (uint32_t)htonl(now.tv_nsec); 1083 if (options & F_TIME) 1084 icp.icmp_otime = htonl((now.tv_sec % (24*60*60)) 1085 * 1000 + now.tv_nsec / 1000000); 1086 if (timing) 1087 bcopy((void *)&tv32, 1088 (void *)&outpack[ICMP_MINLEN + phdr_len], 1089 sizeof(tv32)); 1090 } 1091 1092 memcpy(outpack, &icp, ICMP_MINLEN + phdr_len); 1093 1094 cc = ICMP_MINLEN + phdr_len + datalen; 1095 1096 /* compute ICMP checksum here */ 1097 icp.icmp_cksum = in_cksum(outpack, cc); 1098 /* Update icmp_cksum in the raw packet data buffer. */ 1099 memcpy(outpack + offsetof(struct icmp, icmp_cksum), &icp.icmp_cksum, 1100 sizeof(icp.icmp_cksum)); 1101 1102 if (options & F_HDRINCL) { 1103 struct ip ip; 1104 1105 cc += sizeof(struct ip); 1106 ip.ip_len = htons(cc); 1107 /* Update ip_len in the raw packet data buffer. */ 1108 memcpy(outpackhdr + offsetof(struct ip, ip_len), &ip.ip_len, 1109 sizeof(ip.ip_len)); 1110 ip.ip_sum = in_cksum(outpackhdr, cc); 1111 /* Update ip_sum in the raw packet data buffer. */ 1112 memcpy(outpackhdr + offsetof(struct ip, ip_sum), &ip.ip_sum, 1113 sizeof(ip.ip_sum)); 1114 packet = outpackhdr; 1115 } 1116 i = send(ssend, (char *)packet, cc, 0); 1117 if (i < 0 || i != cc) { 1118 if (i < 0) { 1119 if (options & F_FLOOD && errno == ENOBUFS) { 1120 usleep(FLOOD_BACKOFF); 1121 return; 1122 } 1123 warn("sendto"); 1124 } else { 1125 warn("%s: partial write: %d of %d bytes", 1126 hostname, i, cc); 1127 } 1128 } 1129 ntransmitted++; 1130 sntransmitted++; 1131 if (!(options & F_QUIET) && options & F_DOT) 1132 (void)write(STDOUT_FILENO, &DOT[DOTidx++ % DOTlen], 1); 1133 } 1134 1135 /* 1136 * pr_pack -- 1137 * Print out the packet, if it came from us. This logic is necessary 1138 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets 1139 * which arrive ('tis only fair). This permits multiple copies of this 1140 * program to be run without having intermingled output (or statistics!). 1141 */ 1142 static void 1143 pr_pack(char *buf, ssize_t cc, struct sockaddr_in *from, struct timespec *tv) 1144 { 1145 struct in_addr ina; 1146 u_char *cp, *dp, l; 1147 struct icmp icp; 1148 struct ip ip; 1149 const u_char *icmp_data_raw; 1150 ssize_t icmp_data_raw_len; 1151 double triptime; 1152 int dupflag, i, j, recv_len; 1153 int8_t hlen; 1154 uint16_t seq; 1155 static int old_rrlen; 1156 static char old_rr[MAX_IPOPTLEN]; 1157 struct ip oip; 1158 u_char oip_header_len; 1159 struct icmp oicmp; 1160 const u_char *oicmp_raw; 1161 1162 /* 1163 * Get size of IP header of the received packet. 1164 * The header length is contained in the lower four bits of the first 1165 * byte and represents the number of 4 byte octets the header takes up. 1166 * 1167 * The IHL minimum value is 5 (20 bytes) and its maximum value is 15 1168 * (60 bytes). 1169 */ 1170 memcpy(&l, buf, sizeof(l)); 1171 hlen = (l & 0x0f) << 2; 1172 1173 /* Reject IP packets with a short header */ 1174 if (hlen < (int8_t) sizeof(struct ip)) { 1175 if (options & F_VERBOSE) 1176 warn("IHL too short (%d bytes) from %s", hlen, 1177 inet_ntoa(from->sin_addr)); 1178 return; 1179 } 1180 1181 memcpy(&ip, buf, sizeof(struct ip)); 1182 1183 /* Check packet has enough data to carry a valid ICMP header */ 1184 recv_len = cc; 1185 if (cc < hlen + ICMP_MINLEN) { 1186 if (options & F_VERBOSE) 1187 warn("packet too short (%zd bytes) from %s", cc, 1188 inet_ntoa(from->sin_addr)); 1189 return; 1190 } 1191 1192 #ifndef icmp_data 1193 icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_ip); 1194 #else 1195 icmp_data_raw_len = cc - (hlen + offsetof(struct icmp, icmp_data)); 1196 icmp_data_raw = buf + hlen + offsetof(struct icmp, icmp_data); 1197 #endif 1198 1199 /* Now the ICMP part */ 1200 cc -= hlen; 1201 memcpy(&icp, buf + hlen, MIN((ssize_t)sizeof(icp), cc)); 1202 if (icp.icmp_type == icmp_type_rsp) { 1203 if (icp.icmp_id != ident) 1204 return; /* 'Twas not our ECHO */ 1205 ++nreceived; 1206 triptime = 0.0; 1207 if (timing) { 1208 struct timespec tv1; 1209 struct tv32 tv32; 1210 const u_char *tp; 1211 1212 tp = icmp_data_raw + phdr_len; 1213 1214 if ((size_t)(cc - ICMP_MINLEN - phdr_len) >= 1215 sizeof(tv1)) { 1216 /* Copy to avoid alignment problems: */ 1217 memcpy(&tv32, tp, sizeof(tv32)); 1218 tv1.tv_sec = ntohl(tv32.tv32_sec); 1219 tv1.tv_nsec = ntohl(tv32.tv32_nsec); 1220 timespecsub(tv, &tv1, tv); 1221 triptime = ((double)tv->tv_sec) * 1000.0 + 1222 ((double)tv->tv_nsec) / 1000000.0; 1223 tsum += triptime; 1224 tsumsq += triptime * triptime; 1225 if (triptime < tmin) 1226 tmin = triptime; 1227 if (triptime > tmax) 1228 tmax = triptime; 1229 } else 1230 timing = 0; 1231 } 1232 1233 seq = ntohs(icp.icmp_seq); 1234 1235 if (TST(seq % mx_dup_ck)) { 1236 ++nrepeats; 1237 --nreceived; 1238 dupflag = 1; 1239 } else { 1240 SET(seq % mx_dup_ck); 1241 dupflag = 0; 1242 } 1243 1244 if (options & F_QUIET) 1245 return; 1246 1247 if (options & F_WAITTIME && triptime > waittime) { 1248 ++nrcvtimeout; 1249 return; 1250 } 1251 1252 if (options & F_DOT) 1253 (void)write(STDOUT_FILENO, &BSPACE, 1); 1254 else { 1255 (void)printf("%zd bytes from %s: icmp_seq=%u", cc, 1256 pr_addr(from->sin_addr), seq); 1257 (void)printf(" ttl=%d", ip.ip_ttl); 1258 if (timing) 1259 (void)printf(" time=%.3f ms", triptime); 1260 if (dupflag) 1261 (void)printf(" (DUP!)"); 1262 if (options & F_AUDIBLE) 1263 (void)write(STDOUT_FILENO, &BBELL, 1); 1264 if (options & F_MASK) { 1265 /* Just prentend this cast isn't ugly */ 1266 (void)printf(" mask=%s", 1267 inet_ntoa(*(struct in_addr *)&(icp.icmp_mask))); 1268 } 1269 if (options & F_TIME) { 1270 (void)printf(" tso=%s", pr_ntime(icp.icmp_otime)); 1271 (void)printf(" tsr=%s", pr_ntime(icp.icmp_rtime)); 1272 (void)printf(" tst=%s", pr_ntime(icp.icmp_ttime)); 1273 } 1274 if (recv_len != send_len) { 1275 (void)printf( 1276 "\nwrong total length %d instead of %d", 1277 recv_len, send_len); 1278 } 1279 /* check the data */ 1280 cp = (u_char*)(buf + hlen + offsetof(struct icmp, 1281 icmp_data) + phdr_len); 1282 dp = &outpack[ICMP_MINLEN + phdr_len]; 1283 cc -= ICMP_MINLEN + phdr_len; 1284 i = 0; 1285 if (timing) { /* don't check variable timestamp */ 1286 cp += TIMEVAL_LEN; 1287 dp += TIMEVAL_LEN; 1288 cc -= TIMEVAL_LEN; 1289 i += TIMEVAL_LEN; 1290 } 1291 for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) { 1292 if (*cp != *dp) { 1293 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", 1294 i, *dp, *cp); 1295 (void)printf("\ncp:"); 1296 cp = (u_char*)(buf + hlen + 1297 offsetof(struct icmp, icmp_data)); 1298 for (i = 0; i < datalen; ++i, ++cp) { 1299 if ((i % 16) == 8) 1300 (void)printf("\n\t"); 1301 (void)printf("%2x ", *cp); 1302 } 1303 (void)printf("\ndp:"); 1304 cp = &outpack[ICMP_MINLEN]; 1305 for (i = 0; i < datalen; ++i, ++cp) { 1306 if ((i % 16) == 8) 1307 (void)printf("\n\t"); 1308 (void)printf("%2x ", *cp); 1309 } 1310 break; 1311 } 1312 } 1313 } 1314 } else { 1315 /* 1316 * We've got something other than an ECHOREPLY. 1317 * See if it's a reply to something that we sent. 1318 * We can compare IP destination, protocol, 1319 * and ICMP type and ID. 1320 * 1321 * Only print all the error messages if we are running 1322 * as root to avoid leaking information not normally 1323 * available to those not running as root. 1324 */ 1325 1326 /* 1327 * If we don't have enough bytes for a quoted IP header and an 1328 * ICMP header then stop. 1329 */ 1330 if (icmp_data_raw_len < 1331 (ssize_t)(sizeof(struct ip) + sizeof(struct icmp))) { 1332 if (options & F_VERBOSE) 1333 warnx("quoted data too short (%zd bytes) from %s", 1334 icmp_data_raw_len, inet_ntoa(from->sin_addr)); 1335 return; 1336 } 1337 1338 memcpy(&oip_header_len, icmp_data_raw, sizeof(oip_header_len)); 1339 oip_header_len = (oip_header_len & 0x0f) << 2; 1340 1341 /* Reject IP packets with a short header */ 1342 if (oip_header_len < sizeof(struct ip)) { 1343 if (options & F_VERBOSE) 1344 warnx("inner IHL too short (%d bytes) from %s", 1345 oip_header_len, inet_ntoa(from->sin_addr)); 1346 return; 1347 } 1348 1349 /* 1350 * Check against the actual IHL length, to protect against 1351 * quoated packets carrying IP options. 1352 */ 1353 if (icmp_data_raw_len < 1354 (ssize_t)(oip_header_len + sizeof(struct icmp))) { 1355 if (options & F_VERBOSE) 1356 warnx("inner packet too short (%zd bytes) from %s", 1357 icmp_data_raw_len, inet_ntoa(from->sin_addr)); 1358 return; 1359 } 1360 1361 memcpy(&oip, icmp_data_raw, sizeof(struct ip)); 1362 oicmp_raw = icmp_data_raw + oip_header_len; 1363 memcpy(&oicmp, oicmp_raw, sizeof(struct icmp)); 1364 1365 if (((options & F_VERBOSE) && uid == 0) || 1366 (!(options & F_QUIET2) && 1367 (oip.ip_dst.s_addr == whereto.sin_addr.s_addr) && 1368 (oip.ip_p == IPPROTO_ICMP) && 1369 (oicmp.icmp_type == ICMP_ECHO) && 1370 (oicmp.icmp_id == ident))) { 1371 (void)printf("%zd bytes from %s: ", cc, 1372 pr_addr(from->sin_addr)); 1373 pr_icmph(&icp, &oip, oicmp_raw); 1374 } else 1375 return; 1376 } 1377 1378 /* Display any IP options */ 1379 cp = (u_char *)buf + sizeof(struct ip); 1380 1381 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp) 1382 switch (*cp) { 1383 case IPOPT_EOL: 1384 hlen = 0; 1385 break; 1386 case IPOPT_LSRR: 1387 case IPOPT_SSRR: 1388 (void)printf(*cp == IPOPT_LSRR ? 1389 "\nLSRR: " : "\nSSRR: "); 1390 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1; 1391 hlen -= 2; 1392 cp += 2; 1393 if (j >= INADDR_LEN && 1394 j <= hlen - (int)sizeof(struct ip)) { 1395 for (;;) { 1396 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1397 if (ina.s_addr == 0) 1398 (void)printf("\t0.0.0.0"); 1399 else 1400 (void)printf("\t%s", 1401 pr_addr(ina)); 1402 hlen -= INADDR_LEN; 1403 cp += INADDR_LEN - 1; 1404 j -= INADDR_LEN; 1405 if (j < INADDR_LEN) 1406 break; 1407 (void)putchar('\n'); 1408 } 1409 } else 1410 (void)printf("\t(truncated route)\n"); 1411 break; 1412 case IPOPT_RR: 1413 j = cp[IPOPT_OLEN]; /* get length */ 1414 i = cp[IPOPT_OFFSET]; /* and pointer */ 1415 hlen -= 2; 1416 cp += 2; 1417 if (i > j) 1418 i = j; 1419 i = i - IPOPT_MINOFF + 1; 1420 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) { 1421 old_rrlen = 0; 1422 continue; 1423 } 1424 if (i == old_rrlen 1425 && !bcmp((char *)cp, old_rr, i) 1426 && !(options & F_DOT)) { 1427 (void)printf("\t(same route)"); 1428 hlen -= i; 1429 cp += i; 1430 break; 1431 } 1432 old_rrlen = i; 1433 bcopy((char *)cp, old_rr, i); 1434 (void)printf("\nRR: "); 1435 if (i >= INADDR_LEN && 1436 i <= hlen - (int)sizeof(struct ip)) { 1437 for (;;) { 1438 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1439 if (ina.s_addr == 0) 1440 (void)printf("\t0.0.0.0"); 1441 else 1442 (void)printf("\t%s", 1443 pr_addr(ina)); 1444 hlen -= INADDR_LEN; 1445 cp += INADDR_LEN - 1; 1446 i -= INADDR_LEN; 1447 if (i < INADDR_LEN) 1448 break; 1449 (void)putchar('\n'); 1450 } 1451 } else 1452 (void)printf("\t(truncated route)"); 1453 break; 1454 case IPOPT_NOP: 1455 (void)printf("\nNOP"); 1456 break; 1457 default: 1458 (void)printf("\nunknown option %x", *cp); 1459 break; 1460 } 1461 if (!(options & F_DOT)) { 1462 (void)putchar('\n'); 1463 (void)fflush(stdout); 1464 } 1465 } 1466 1467 /* 1468 * status -- 1469 * Print out statistics when SIGINFO is received. 1470 */ 1471 1472 static void 1473 status(int sig __unused) 1474 { 1475 1476 siginfo_p = 1; 1477 } 1478 1479 static void 1480 check_status(void) 1481 { 1482 1483 if (siginfo_p) { 1484 siginfo_p = 0; 1485 (void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)", 1486 nreceived, ntransmitted, 1487 ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0); 1488 if (nreceived && timing) 1489 (void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max", 1490 tmin, tsum / (nreceived + nrepeats), tmax); 1491 (void)fprintf(stderr, "\n"); 1492 } 1493 } 1494 1495 /* 1496 * finish -- 1497 * Print out statistics, and give up. 1498 */ 1499 static void 1500 finish(void) 1501 { 1502 1503 (void)signal(SIGINT, SIG_IGN); 1504 (void)signal(SIGALRM, SIG_IGN); 1505 (void)putchar('\n'); 1506 (void)fflush(stdout); 1507 (void)printf("--- %s ping statistics ---\n", hostname); 1508 (void)printf("%ld packets transmitted, ", ntransmitted); 1509 (void)printf("%ld packets received, ", nreceived); 1510 if (nrepeats) 1511 (void)printf("+%ld duplicates, ", nrepeats); 1512 if (ntransmitted) { 1513 if (nreceived > ntransmitted) 1514 (void)printf("-- somebody's printing up packets!"); 1515 else 1516 (void)printf("%.1f%% packet loss", 1517 ((ntransmitted - nreceived) * 100.0) / 1518 ntransmitted); 1519 } 1520 if (nrcvtimeout) 1521 (void)printf(", %ld packets out of wait time", nrcvtimeout); 1522 (void)putchar('\n'); 1523 if (nreceived && timing) { 1524 double n = nreceived + nrepeats; 1525 double avg = tsum / n; 1526 double vari = tsumsq / n - avg * avg; 1527 (void)printf( 1528 "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n", 1529 tmin, avg, tmax, sqrt(vari)); 1530 } 1531 1532 if (nreceived) 1533 exit(0); 1534 else 1535 exit(2); 1536 } 1537 1538 /* 1539 * pr_icmph -- 1540 * Print a descriptive string about an ICMP header. 1541 */ 1542 static void 1543 pr_icmph(struct icmp *icp, struct ip *oip, const u_char *const oicmp_raw) 1544 { 1545 1546 switch(icp->icmp_type) { 1547 case ICMP_ECHOREPLY: 1548 (void)printf("Echo Reply\n"); 1549 /* XXX ID + Seq + Data */ 1550 break; 1551 case ICMP_UNREACH: 1552 switch(icp->icmp_code) { 1553 case ICMP_UNREACH_NET: 1554 (void)printf("Destination Net Unreachable\n"); 1555 break; 1556 case ICMP_UNREACH_HOST: 1557 (void)printf("Destination Host Unreachable\n"); 1558 break; 1559 case ICMP_UNREACH_PROTOCOL: 1560 (void)printf("Destination Protocol Unreachable\n"); 1561 break; 1562 case ICMP_UNREACH_PORT: 1563 (void)printf("Destination Port Unreachable\n"); 1564 break; 1565 case ICMP_UNREACH_NEEDFRAG: 1566 (void)printf("frag needed and DF set (MTU %d)\n", 1567 ntohs(icp->icmp_nextmtu)); 1568 break; 1569 case ICMP_UNREACH_SRCFAIL: 1570 (void)printf("Source Route Failed\n"); 1571 break; 1572 case ICMP_UNREACH_FILTER_PROHIB: 1573 (void)printf("Communication prohibited by filter\n"); 1574 break; 1575 default: 1576 (void)printf("Dest Unreachable, Bad Code: %d\n", 1577 icp->icmp_code); 1578 break; 1579 } 1580 /* Print returned IP header information */ 1581 pr_retip(oip, oicmp_raw); 1582 break; 1583 case ICMP_SOURCEQUENCH: 1584 (void)printf("Source Quench\n"); 1585 pr_retip(oip, oicmp_raw); 1586 break; 1587 case ICMP_REDIRECT: 1588 switch(icp->icmp_code) { 1589 case ICMP_REDIRECT_NET: 1590 (void)printf("Redirect Network"); 1591 break; 1592 case ICMP_REDIRECT_HOST: 1593 (void)printf("Redirect Host"); 1594 break; 1595 case ICMP_REDIRECT_TOSNET: 1596 (void)printf("Redirect Type of Service and Network"); 1597 break; 1598 case ICMP_REDIRECT_TOSHOST: 1599 (void)printf("Redirect Type of Service and Host"); 1600 break; 1601 default: 1602 (void)printf("Redirect, Bad Code: %d", icp->icmp_code); 1603 break; 1604 } 1605 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr)); 1606 pr_retip(oip, oicmp_raw); 1607 break; 1608 case ICMP_ECHO: 1609 (void)printf("Echo Request\n"); 1610 /* XXX ID + Seq + Data */ 1611 break; 1612 case ICMP_TIMXCEED: 1613 switch(icp->icmp_code) { 1614 case ICMP_TIMXCEED_INTRANS: 1615 (void)printf("Time to live exceeded\n"); 1616 break; 1617 case ICMP_TIMXCEED_REASS: 1618 (void)printf("Frag reassembly time exceeded\n"); 1619 break; 1620 default: 1621 (void)printf("Time exceeded, Bad Code: %d\n", 1622 icp->icmp_code); 1623 break; 1624 } 1625 pr_retip(oip, oicmp_raw); 1626 break; 1627 case ICMP_PARAMPROB: 1628 (void)printf("Parameter problem: pointer = 0x%02x\n", 1629 icp->icmp_hun.ih_pptr); 1630 pr_retip(oip, oicmp_raw); 1631 break; 1632 case ICMP_TSTAMP: 1633 (void)printf("Timestamp\n"); 1634 /* XXX ID + Seq + 3 timestamps */ 1635 break; 1636 case ICMP_TSTAMPREPLY: 1637 (void)printf("Timestamp Reply\n"); 1638 /* XXX ID + Seq + 3 timestamps */ 1639 break; 1640 case ICMP_IREQ: 1641 (void)printf("Information Request\n"); 1642 /* XXX ID + Seq */ 1643 break; 1644 case ICMP_IREQREPLY: 1645 (void)printf("Information Reply\n"); 1646 /* XXX ID + Seq */ 1647 break; 1648 case ICMP_MASKREQ: 1649 (void)printf("Address Mask Request\n"); 1650 break; 1651 case ICMP_MASKREPLY: 1652 (void)printf("Address Mask Reply\n"); 1653 break; 1654 case ICMP_ROUTERADVERT: 1655 (void)printf("Router Advertisement\n"); 1656 break; 1657 case ICMP_ROUTERSOLICIT: 1658 (void)printf("Router Solicitation\n"); 1659 break; 1660 default: 1661 (void)printf("Bad ICMP type: %d\n", icp->icmp_type); 1662 } 1663 } 1664 1665 /* 1666 * pr_iph -- 1667 * Print an IP header with options. 1668 */ 1669 static void 1670 pr_iph(struct ip *ip) 1671 { 1672 struct in_addr ina; 1673 u_char *cp; 1674 int hlen; 1675 1676 hlen = ip->ip_hl << 2; 1677 cp = (u_char *)ip + 20; /* point to options */ 1678 1679 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\n"); 1680 (void)printf(" %1x %1x %02x %04x %04x", 1681 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len), 1682 ntohs(ip->ip_id)); 1683 (void)printf(" %1lx %04lx", 1684 (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13, 1685 (u_long) ntohl(ip->ip_off) & 0x1fff); 1686 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, 1687 ntohs(ip->ip_sum)); 1688 memcpy(&ina, &ip->ip_src.s_addr, sizeof ina); 1689 (void)printf(" %s ", inet_ntoa(ina)); 1690 memcpy(&ina, &ip->ip_dst.s_addr, sizeof ina); 1691 (void)printf(" %s ", inet_ntoa(ina)); 1692 /* dump any option bytes */ 1693 while (hlen-- > 20) { 1694 (void)printf("%02x", *cp++); 1695 } 1696 (void)putchar('\n'); 1697 } 1698 1699 /* 1700 * pr_addr -- 1701 * Return an ascii host address as a dotted quad and optionally with 1702 * a hostname. 1703 */ 1704 static char * 1705 pr_addr(struct in_addr ina) 1706 { 1707 struct hostent *hp; 1708 static char buf[16 + 3 + MAXHOSTNAMELEN]; 1709 1710 if (options & F_NUMERIC) 1711 return inet_ntoa(ina); 1712 1713 hp = cap_gethostbyaddr(capdns, (char *)&ina, 4, AF_INET); 1714 1715 if (hp == NULL) 1716 return inet_ntoa(ina); 1717 1718 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name, 1719 inet_ntoa(ina)); 1720 return(buf); 1721 } 1722 1723 /* 1724 * pr_retip -- 1725 * Dump some info on a returned (via ICMP) IP packet. 1726 */ 1727 static void 1728 pr_retip(struct ip *ip, const u_char *cp) 1729 { 1730 pr_iph(ip); 1731 1732 if (ip->ip_p == 6) 1733 (void)printf("TCP: from port %u, to port %u (decimal)\n", 1734 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1735 else if (ip->ip_p == 17) 1736 (void)printf("UDP: from port %u, to port %u (decimal)\n", 1737 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1738 } 1739 1740 static char * 1741 pr_ntime(n_time timestamp) 1742 { 1743 static char buf[11]; 1744 int hour, min, sec; 1745 1746 sec = ntohl(timestamp) / 1000; 1747 hour = sec / 60 / 60; 1748 min = (sec % (60 * 60)) / 60; 1749 sec = (sec % (60 * 60)) % 60; 1750 1751 (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec); 1752 1753 return (buf); 1754 } 1755 1756 static void 1757 fill(char *bp, char *patp) 1758 { 1759 char *cp; 1760 int pat[16]; 1761 u_int ii, jj, kk; 1762 1763 for (cp = patp; *cp; cp++) { 1764 if (!isxdigit(*cp)) 1765 errx(EX_USAGE, 1766 "patterns must be specified as hex digits"); 1767 1768 } 1769 ii = sscanf(patp, 1770 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", 1771 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], 1772 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], 1773 &pat[13], &pat[14], &pat[15]); 1774 1775 if (ii > 0) 1776 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii) 1777 for (jj = 0; jj < ii; ++jj) 1778 bp[jj + kk] = pat[jj]; 1779 if (!(options & F_QUIET)) { 1780 (void)printf("PATTERN: 0x"); 1781 for (jj = 0; jj < ii; ++jj) 1782 (void)printf("%02x", bp[jj] & 0xFF); 1783 (void)printf("\n"); 1784 } 1785 } 1786 1787 static cap_channel_t * 1788 capdns_setup(void) 1789 { 1790 cap_channel_t *capcas, *capdnsloc; 1791 #ifdef WITH_CASPER 1792 const char *types[2]; 1793 int families[1]; 1794 #endif 1795 capcas = cap_init(); 1796 if (capcas == NULL) 1797 err(1, "unable to create casper process"); 1798 capdnsloc = cap_service_open(capcas, "system.dns"); 1799 /* Casper capability no longer needed. */ 1800 cap_close(capcas); 1801 if (capdnsloc == NULL) 1802 err(1, "unable to open system.dns service"); 1803 #ifdef WITH_CASPER 1804 types[0] = "NAME2ADDR"; 1805 types[1] = "ADDR2NAME"; 1806 if (cap_dns_type_limit(capdnsloc, types, 2) < 0) 1807 err(1, "unable to limit access to system.dns service"); 1808 families[0] = AF_INET; 1809 if (cap_dns_family_limit(capdnsloc, families, 1) < 0) 1810 err(1, "unable to limit access to system.dns service"); 1811 #endif 1812 return (capdnsloc); 1813 } 1814