sbin/ping/ping.c

   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 <ctype.h>
  89 #include <err.h>
  90 #include <errno.h>
  91 #include <math.h>
  92 #include <netdb.h>
  93 #include <signal.h>
  94 #include <stdio.h>
  95 #include <stdlib.h>
  96 #include <string.h>
  97 #include <sysexits.h>
  98 #include <unistd.h>
  99
 100 #define INADDR_LEN      ((int)sizeof(in_addr_t))
 101 #define TIMEVAL_LEN     ((int)sizeof(struct tv32))
 102 #define MASK_LEN        (ICMP_MASKLEN - ICMP_MINLEN)
 103 #define TS_LEN          (ICMP_TSLEN - ICMP_MINLEN)
 104 #define DEFDATALEN      56              /* default data length */
 105 #define FLOOD_BACKOFF   20000           /* usecs to back off if F_FLOOD mode */
 106                                         /* runs out of buffer space */
 107 #define MAXIPLEN        (sizeof(struct ip) + MAX_IPOPTLEN)
 108 #define MAXICMPLEN      (ICMP_ADVLENMIN + MAX_IPOPTLEN)
 109 #define MAXWAIT         10000           /* max ms to wait for response */
 110 #define MAXALARM        (60 * 60)       /* max seconds for alarm timeout */
 111 #define MAXTOS          255
 112
 113 #define A(bit)          rcvd_tbl[(bit)>>3]      /* identify byte in array */
 114 #define B(bit)          (1 << ((bit) & 0x07))   /* identify bit in byte */
 115 #define SET(bit)        (A(bit) |= B(bit))
 116 #define CLR(bit)        (A(bit) &= (~B(bit)))
 117 #define TST(bit)        (A(bit) & B(bit))
 118
 119 struct tv32 {
 120         int32_t tv32_sec;
 121         int32_t tv32_usec;
 122 };
 123
 124 /* various options */
 125 static int options;
 126 #define F_FLOOD         0x0001
 127 #define F_INTERVAL      0x0002
 128 #define F_NUMERIC       0x0004
 129 #define F_PINGFILLED    0x0008
 130 #define F_QUIET         0x0010
 131 #define F_RROUTE        0x0020
 132 #define F_SO_DEBUG      0x0040
 133 #define F_SO_DONTROUTE  0x0080
 134 #define F_VERBOSE       0x0100
 135 #define F_QUIET2        0x0200
 136 #define F_NOLOOP        0x0400
 137 #define F_MTTL          0x0800
 138 #define F_MIF           0x1000
 139 #define F_AUDIBLE       0x2000
 140 #ifdef IPSEC
 141 #ifdef IPSEC_POLICY_IPSEC
 142 #define F_POLICY        0x4000
 143 #endif /*IPSEC_POLICY_IPSEC*/
 144 #endif /*IPSEC*/
 145 #define F_TTL           0x8000
 146 #define F_MISSED        0x10000
 147 #define F_ONCE          0x20000
 148 #define F_HDRINCL       0x40000
 149 #define F_MASK          0x80000
 150 #define F_TIME          0x100000
 151 #define F_SWEEP         0x200000
 152 #define F_WAITTIME      0x400000
 153
 154 /*
 155  * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
 156  * number of received sequence numbers we can keep track of.  Change 128
 157  * to 8192 for complete accuracy...
 158  */
 159 #define MAX_DUP_CHK     (8 * 128)
 160 static int mx_dup_ck = MAX_DUP_CHK;
 161 static char rcvd_tbl[MAX_DUP_CHK / 8];
 162
 163 static struct sockaddr_in whereto;      /* who to ping */
 164 static int datalen = DEFDATALEN;
 165 static int maxpayload;
 166 static int ssend;               /* send socket file descriptor */
 167 static int srecv;               /* receive socket file descriptor */
 168 static u_char outpackhdr[IP_MAXPACKET], *outpack;
 169 static char BBELL = '\a';       /* characters written for MISSED and AUDIBLE */
 170 static char BSPACE = '\b';      /* characters written for flood */
 171 static char DOT = '.';
 172 static char *hostname;
 173 static char *shostname;
 174 static int ident;               /* process id to identify our packets */
 175 static int uid;                 /* cached uid for micro-optimization */
 176 static u_char icmp_type = ICMP_ECHO;
 177 static u_char icmp_type_rsp = ICMP_ECHOREPLY;
 178 static int phdr_len = 0;
 179 static int send_len;
 180
 181 /* counters */
 182 static long nmissedmax;         /* max value of ntransmitted - nreceived - 1 */
 183 static long npackets;           /* max packets to transmit */
 184 static long nreceived;          /* # of packets we got back */
 185 static long nrepeats;           /* number of duplicates */
 186 static long ntransmitted;       /* sequence # for outbound packets = #sent */
 187 static long snpackets;                  /* max packets to transmit in one sweep */
 188 static long sntransmitted;      /* # of packets we sent in this sweep */
 189 static int sweepmax;            /* max value of payload in sweep */
 190 static int sweepmin = 0;        /* start value of payload in sweep */
 191 static int sweepincr = 1;       /* payload increment in sweep */
 192 static int interval = 1000;     /* interval between packets, ms */
 193 static int waittime = MAXWAIT;  /* timeout for each packet */
 194 static long nrcvtimeout = 0;    /* # of packets we got back after waittime */
 195
 196 /* timing */
 197 static int timing;              /* flag to do timing */
 198 static double tmin = 999999999.0;       /* minimum round trip time */
 199 static double tmax = 0.0;       /* maximum round trip time */
 200 static double tsum = 0.0;       /* sum of all times, for doing average */
 201 static double tsumsq = 0.0;     /* sum of all times squared, for std. dev. */
 202
 203 /* nonzero if we've been told to finish up */
 204 static volatile sig_atomic_t finish_up;
 205 static volatile sig_atomic_t siginfo_p;
 206
 207 static cap_channel_t *capdns;
 208
 209 static void fill(char *, char *);
 210 static u_short in_cksum(u_short *, int);
 211 static cap_channel_t *capdns_setup(void);
 212 static void check_status(void);
 213 static void finish(void) __dead2;
 214 static void pinger(void);
 215 static char *pr_addr(struct in_addr);
 216 static char *pr_ntime(n_time);
 217 static void pr_icmph(struct icmp *);
 218 static void pr_iph(struct ip *);
 219 static void pr_pack(char *, int, struct sockaddr_in *, struct timeval *);
 220 static void pr_retip(struct ip *);
 221 static void status(int);
 222 static void stopit(int);
 223 static void tvsub(struct timeval *, const struct timeval *);
 224 static void usage(void) __dead2;
 225
 226 int
 227 main(int argc, char *const *argv)
 228 {
 229         struct sockaddr_in from, sock_in;
 230         struct in_addr ifaddr;
 231         struct timeval last, intvl;
 232         struct iovec iov;
 233         struct ip *ip;
 234         struct msghdr msg;
 235         struct sigaction si_sa;
 236         size_t sz;
 237         u_char *datap, packet[IP_MAXPACKET] __aligned(4);
 238         char *ep, *source, *target, *payload;
 239         struct hostent *hp;
 240 #ifdef IPSEC_POLICY_IPSEC
 241         char *policy_in, *policy_out;
 242 #endif
 243         struct sockaddr_in *to;
 244         double t;
 245         u_long alarmtimeout, ultmp;
 246         int almost_done, ch, df, hold, i, icmp_len, mib[4], preload;
 247         int ssend_errno, srecv_errno, tos, ttl;
 248         char ctrl[CMSG_SPACE(sizeof(struct timeval))];
 249         char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN];
 250 #ifdef IP_OPTIONS
 251         char rspace[MAX_IPOPTLEN];      /* record route space */
 252 #endif
 253         unsigned char loop, mttl;
 254
 255         payload = source = NULL;
 256 #ifdef IPSEC_POLICY_IPSEC
 257         policy_in = policy_out = NULL;
 258 #endif
 259         cap_rights_t rights;
 260         bool cansandbox;
 261
 262         /*
 263          * Do the stuff that we need root priv's for *first*, and
 264          * then drop our setuid bit.  Save error reporting for
 265          * after arg parsing.
 266          *
 267          * Historicaly ping was using one socket 's' for sending and for
 268          * receiving. After capsicum(4) related changes we use two
 269          * sockets. It was done for special ping use case - when user
 270          * issue ping on multicast or broadcast address replies come
 271          * from different addresses, not from the address we
 272          * connect(2)'ed to, and send socket do not receive those
 273          * packets.
 274          */
 275         ssend = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 276         ssend_errno = errno;
 277         srecv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 278         srecv_errno = errno;
 279
 280         if (setuid(getuid()) != 0)
 281                 err(EX_NOPERM, "setuid() failed");
 282         uid = getuid();
 283
 284         if (ssend < 0) {
 285                 errno = ssend_errno;
 286                 err(EX_OSERR, "ssend socket");
 287         }
 288
 289         if (srecv < 0) {
 290                 errno = srecv_errno;
 291                 err(EX_OSERR, "srecv socket");
 292         }
 293
 294         alarmtimeout = df = preload = tos = 0;
 295
 296         outpack = outpackhdr + sizeof(struct ip);
 297         while ((ch = getopt(argc, argv,
 298                 "Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
 299 #ifdef IPSEC
 300 #ifdef IPSEC_POLICY_IPSEC
 301                 "P:"
 302 #endif /*IPSEC_POLICY_IPSEC*/
 303 #endif /*IPSEC*/
 304                 )) != -1)
 305         {
 306                 switch(ch) {
 307                 case 'A':
 308                         options |= F_MISSED;
 309                         break;
 310                 case 'a':
 311                         options |= F_AUDIBLE;
 312                         break;
 313                 case 'c':
 314                         ultmp = strtoul(optarg, &ep, 0);
 315                         if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp)
 316                                 errx(EX_USAGE,
 317                                     "invalid count of packets to transmit: `%s'",
 318                                     optarg);
 319                         npackets = ultmp;
 320                         break;
 321                 case 'D':
 322                         options |= F_HDRINCL;
 323                         df = 1;
 324                         break;
 325                 case 'd':
 326                         options |= F_SO_DEBUG;
 327                         break;
 328                 case 'f':
 329                         if (uid) {
 330                                 errno = EPERM;
 331                                 err(EX_NOPERM, "-f flag");
 332                         }
 333                         options |= F_FLOOD;
 334                         setbuf(stdout, (char *)NULL);
 335                         break;
 336                 case 'G': /* Maximum packet size for ping sweep */
 337                         ultmp = strtoul(optarg, &ep, 0);
 338                         if (*ep || ep == optarg)
 339                                 errx(EX_USAGE, "invalid packet size: `%s'",
 340                                     optarg);
 341                         if (uid != 0 && ultmp > DEFDATALEN) {
 342                                 errno = EPERM;
 343                                 err(EX_NOPERM,
 344                                     "packet size too large: %lu > %u",
 345                                     ultmp, DEFDATALEN);
 346                         }
 347                         options |= F_SWEEP;
 348                         sweepmax = ultmp;
 349                         break;
 350                 case 'g': /* Minimum packet size for ping sweep */
 351                         ultmp = strtoul(optarg, &ep, 0);
 352                         if (*ep || ep == optarg)
 353                                 errx(EX_USAGE, "invalid packet size: `%s'",
 354                                     optarg);
 355                         if (uid != 0 && ultmp > DEFDATALEN) {
 356                                 errno = EPERM;
 357                                 err(EX_NOPERM,
 358                                     "packet size too large: %lu > %u",
 359                                     ultmp, DEFDATALEN);
 360                         }
 361                         options |= F_SWEEP;
 362                         sweepmin = ultmp;
 363                         break;
 364                 case 'h': /* Packet size increment for ping sweep */
 365                         ultmp = strtoul(optarg, &ep, 0);
 366                         if (*ep || ep == optarg || ultmp < 1)
 367                                 errx(EX_USAGE, "invalid increment size: `%s'",
 368                                     optarg);
 369                         if (uid != 0 && ultmp > DEFDATALEN) {
 370                                 errno = EPERM;
 371                                 err(EX_NOPERM,
 372                                     "packet size too large: %lu > %u",
 373                                     ultmp, DEFDATALEN);
 374                         }
 375                         options |= F_SWEEP;
 376                         sweepincr = ultmp;
 377                         break;
 378                 case 'I':               /* multicast interface */
 379                         if (inet_aton(optarg, &ifaddr) == 0)
 380                                 errx(EX_USAGE,
 381                                     "invalid multicast interface: `%s'",
 382                                     optarg);
 383                         options |= F_MIF;
 384                         break;
 385                 case 'i':               /* wait between sending packets */
 386                         t = strtod(optarg, &ep) * 1000.0;
 387                         if (*ep || ep == optarg || t > (double)INT_MAX)
 388                                 errx(EX_USAGE, "invalid timing interval: `%s'",
 389                                     optarg);
 390                         options |= F_INTERVAL;
 391                         interval = (int)t;
 392                         if (uid && interval < 1000) {
 393                                 errno = EPERM;
 394                                 err(EX_NOPERM, "-i interval too short");
 395                         }
 396                         break;
 397                 case 'L':
 398                         options |= F_NOLOOP;
 399                         loop = 0;
 400                         break;
 401                 case 'l':
 402                         ultmp = strtoul(optarg, &ep, 0);
 403                         if (*ep || ep == optarg || ultmp > INT_MAX)
 404                                 errx(EX_USAGE,
 405                                     "invalid preload value: `%s'", optarg);
 406                         if (uid) {
 407                                 errno = EPERM;
 408                                 err(EX_NOPERM, "-l flag");
 409                         }
 410                         preload = ultmp;
 411                         break;
 412                 case 'M':
 413                         switch(optarg[0]) {
 414                         case 'M':
 415                         case 'm':
 416                                 options |= F_MASK;
 417                                 break;
 418                         case 'T':
 419                         case 't':
 420                                 options |= F_TIME;
 421                                 break;
 422                         default:
 423                                 errx(EX_USAGE, "invalid message: `%c'", optarg[0]);
 424                                 break;
 425                         }
 426                         break;
 427                 case 'm':               /* TTL */
 428                         ultmp = strtoul(optarg, &ep, 0);
 429                         if (*ep || ep == optarg || ultmp > MAXTTL)
 430                                 errx(EX_USAGE, "invalid TTL: `%s'", optarg);
 431                         ttl = ultmp;
 432                         options |= F_TTL;
 433                         break;
 434                 case 'n':
 435                         options |= F_NUMERIC;
 436                         break;
 437                 case 'o':
 438                         options |= F_ONCE;
 439                         break;
 440 #ifdef IPSEC
 441 #ifdef IPSEC_POLICY_IPSEC
 442                 case 'P':
 443                         options |= F_POLICY;
 444                         if (!strncmp("in", optarg, 2))
 445                                 policy_in = strdup(optarg);
 446                         else if (!strncmp("out", optarg, 3))
 447                                 policy_out = strdup(optarg);
 448                         else
 449                                 errx(1, "invalid security policy");
 450                         break;
 451 #endif /*IPSEC_POLICY_IPSEC*/
 452 #endif /*IPSEC*/
 453                 case 'p':               /* fill buffer with user pattern */
 454                         options |= F_PINGFILLED;
 455                         payload = optarg;
 456                         break;
 457                 case 'Q':
 458                         options |= F_QUIET2;
 459                         break;
 460                 case 'q':
 461                         options |= F_QUIET;
 462                         break;
 463                 case 'R':
 464                         options |= F_RROUTE;
 465                         break;
 466                 case 'r':
 467                         options |= F_SO_DONTROUTE;
 468                         break;
 469                 case 'S':
 470                         source = optarg;
 471                         break;
 472                 case 's':               /* size of packet to send */
 473                         ultmp = strtoul(optarg, &ep, 0);
 474                         if (*ep || ep == optarg)
 475                                 errx(EX_USAGE, "invalid packet size: `%s'",
 476                                     optarg);
 477                         if (uid != 0 && ultmp > DEFDATALEN) {
 478                                 errno = EPERM;
 479                                 err(EX_NOPERM,
 480                                     "packet size too large: %lu > %u",
 481                                     ultmp, DEFDATALEN);
 482                         }
 483                         datalen = ultmp;
 484                         break;
 485                 case 'T':               /* multicast TTL */
 486                         ultmp = strtoul(optarg, &ep, 0);
 487                         if (*ep || ep == optarg || ultmp > MAXTTL)
 488                                 errx(EX_USAGE, "invalid multicast TTL: `%s'",
 489                                     optarg);
 490                         mttl = ultmp;
 491                         options |= F_MTTL;
 492                         break;
 493                 case 't':
 494                         alarmtimeout = strtoul(optarg, &ep, 0);
 495                         if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
 496                                 errx(EX_USAGE, "invalid timeout: `%s'",
 497                                     optarg);
 498                         if (alarmtimeout > MAXALARM)
 499                                 errx(EX_USAGE, "invalid timeout: `%s' > %d",
 500                                     optarg, MAXALARM);
 501                         alarm((int)alarmtimeout);
 502                         break;
 503                 case 'v':
 504                         options |= F_VERBOSE;
 505                         break;
 506                 case 'W':               /* wait ms for answer */
 507                         t = strtod(optarg, &ep);
 508                         if (*ep || ep == optarg || t > (double)INT_MAX)
 509                                 errx(EX_USAGE, "invalid timing interval: `%s'",
 510                                     optarg);
 511                         options |= F_WAITTIME;
 512                         waittime = (int)t;
 513                         break;
 514                 case 'z':
 515                         options |= F_HDRINCL;
 516                         ultmp = strtoul(optarg, &ep, 0);
 517                         if (*ep || ep == optarg || ultmp > MAXTOS)
 518                                 errx(EX_USAGE, "invalid TOS: `%s'", optarg);
 519                         tos = ultmp;
 520                         break;
 521                 default:
 522                         usage();
 523                 }
 524         }
 525
 526         if (argc - optind != 1)
 527                 usage();
 528         target = argv[optind];
 529
 530         switch (options & (F_MASK|F_TIME)) {
 531         case 0: break;
 532         case F_MASK:
 533                 icmp_type = ICMP_MASKREQ;
 534                 icmp_type_rsp = ICMP_MASKREPLY;
 535                 phdr_len = MASK_LEN;
 536                 if (!(options & F_QUIET))
 537                         (void)printf("ICMP_MASKREQ\n");
 538                 break;
 539         case F_TIME:
 540                 icmp_type = ICMP_TSTAMP;
 541                 icmp_type_rsp = ICMP_TSTAMPREPLY;
 542                 phdr_len = TS_LEN;
 543                 if (!(options & F_QUIET))
 544                         (void)printf("ICMP_TSTAMP\n");
 545                 break;
 546         default:
 547                 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive.");
 548                 break;
 549         }
 550         icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len;
 551         if (options & F_RROUTE)
 552                 icmp_len += MAX_IPOPTLEN;
 553         maxpayload = IP_MAXPACKET - icmp_len;
 554         if (datalen > maxpayload)
 555                 errx(EX_USAGE, "packet size too large: %d > %d", datalen,
 556                     maxpayload);
 557         send_len = icmp_len + datalen;
 558         datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN];
 559         if (options & F_PINGFILLED) {
 560                 fill((char *)datap, payload);
 561         }
 562         capdns = capdns_setup();
 563         if (source) {
 564                 bzero((char *)&sock_in, sizeof(sock_in));
 565                 sock_in.sin_family = AF_INET;
 566                 if (inet_aton(source, &sock_in.sin_addr) != 0) {
 567                         shostname = source;
 568                 } else {
 569                         if (capdns != NULL)
 570                                 hp = cap_gethostbyname2(capdns, source,
 571                                     AF_INET);
 572                         else
 573                                 hp = gethostbyname2(source, AF_INET);
 574                         if (!hp)
 575                                 errx(EX_NOHOST, "cannot resolve %s: %s",
 576                                     source, hstrerror(h_errno));
 577
 578                         sock_in.sin_len = sizeof sock_in;
 579                         if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) ||
 580                             hp->h_length < 0)
 581                                 errx(1, "gethostbyname2: illegal address");
 582                         memcpy(&sock_in.sin_addr, hp->h_addr_list[0],
 583                             sizeof(sock_in.sin_addr));
 584                         (void)strncpy(snamebuf, hp->h_name,
 585                             sizeof(snamebuf) - 1);
 586                         snamebuf[sizeof(snamebuf) - 1] = '\0';
 587                         shostname = snamebuf;
 588                 }
 589                 if (bind(ssend, (struct sockaddr *)&sock_in, sizeof sock_in) ==
 590                     -1)
 591                         err(1, "bind");
 592         }
 593
 594         bzero(&whereto, sizeof(whereto));
 595         to = &whereto;
 596         to->sin_family = AF_INET;
 597         to->sin_len = sizeof *to;
 598         if (inet_aton(target, &to->sin_addr) != 0) {
 599                 hostname = target;
 600         } else {
 601                 if (capdns != NULL)
 602                         hp = cap_gethostbyname2(capdns, target, AF_INET);
 603                 else
 604                         hp = gethostbyname2(target, AF_INET);
 605                 if (!hp)
 606                         errx(EX_NOHOST, "cannot resolve %s: %s",
 607                             target, hstrerror(h_errno));
 608
 609                 if ((unsigned)hp->h_length > sizeof(to->sin_addr))
 610                         errx(1, "gethostbyname2 returned an illegal address");
 611                 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
 612                 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
 613                 hnamebuf[sizeof(hnamebuf) - 1] = '\0';
 614                 hostname = hnamebuf;
 615         }
 616
 617         /* From now on we will use only reverse DNS lookups. */
 618         if (capdns != NULL) {
 619                 const char *types[1];
 620
 621                 types[0] = "ADDR";
 622                 if (cap_dns_type_limit(capdns, types, 1) < 0)
 623                         err(1, "unable to limit access to system.dns service");
 624         }
 625
 626         if (connect(ssend, (struct sockaddr *)&whereto, sizeof(whereto)) != 0)
 627                 err(1, "connect");
 628
 629         if (options & F_FLOOD && options & F_INTERVAL)
 630                 errx(EX_USAGE, "-f and -i: incompatible options");
 631
 632         if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
 633                 errx(EX_USAGE,
 634                     "-f flag cannot be used with multicast destination");
 635         if (options & (F_MIF | F_NOLOOP | F_MTTL)
 636             && !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
 637                 errx(EX_USAGE,
 638                     "-I, -L, -T flags cannot be used with unicast destination");
 639
 640         if (datalen >= TIMEVAL_LEN)     /* can we time transfer */
 641                 timing = 1;
 642
 643         if (!(options & F_PINGFILLED))
 644                 for (i = TIMEVAL_LEN; i < datalen; ++i)
 645                         *datap++ = i;
 646
 647         ident = getpid() & 0xFFFF;
 648
 649         hold = 1;
 650         if (options & F_SO_DEBUG) {
 651                 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 652                     sizeof(hold));
 653                 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 654                     sizeof(hold));
 655         }
 656         if (options & F_SO_DONTROUTE)
 657                 (void)setsockopt(ssend, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
 658                     sizeof(hold));
 659 #ifdef IPSEC
 660 #ifdef IPSEC_POLICY_IPSEC
 661         if (options & F_POLICY) {
 662                 char *buf;
 663                 if (policy_in != NULL) {
 664                         buf = ipsec_set_policy(policy_in, strlen(policy_in));
 665                         if (buf == NULL)
 666                                 errx(EX_CONFIG, "%s", ipsec_strerror());
 667                         if (setsockopt(srecv, IPPROTO_IP, IP_IPSEC_POLICY,
 668                                         buf, ipsec_get_policylen(buf)) < 0)
 669                                 err(EX_CONFIG,
 670                                     "ipsec policy cannot be configured");
 671                         free(buf);
 672                 }
 673
 674                 if (policy_out != NULL) {
 675                         buf = ipsec_set_policy(policy_out, strlen(policy_out));
 676                         if (buf == NULL)
 677                                 errx(EX_CONFIG, "%s", ipsec_strerror());
 678                         if (setsockopt(ssend, IPPROTO_IP, IP_IPSEC_POLICY,
 679                                         buf, ipsec_get_policylen(buf)) < 0)
 680                                 err(EX_CONFIG,
 681                                     "ipsec policy cannot be configured");
 682                         free(buf);
 683                 }
 684         }
 685 #endif /*IPSEC_POLICY_IPSEC*/
 686 #endif /*IPSEC*/
 687
 688         if (options & F_HDRINCL) {
 689                 ip = (struct ip*)outpackhdr;
 690                 if (!(options & (F_TTL | F_MTTL))) {
 691                         mib[0] = CTL_NET;
 692                         mib[1] = PF_INET;
 693                         mib[2] = IPPROTO_IP;
 694                         mib[3] = IPCTL_DEFTTL;
 695                         sz = sizeof(ttl);
 696                         if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1)
 697                                 err(1, "sysctl(net.inet.ip.ttl)");
 698                 }
 699                 setsockopt(ssend, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
 700                 ip->ip_v = IPVERSION;
 701                 ip->ip_hl = sizeof(struct ip) >> 2;
 702                 ip->ip_tos = tos;
 703                 ip->ip_id = 0;
 704                 ip->ip_off = htons(df ? IP_DF : 0);
 705                 ip->ip_ttl = ttl;
 706                 ip->ip_p = IPPROTO_ICMP;
 707                 ip->ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY;
 708                 ip->ip_dst = to->sin_addr;
 709         }
 710
 711         if (options & F_NUMERIC)
 712                 cansandbox = true;
 713         else if (capdns != NULL)
 714                 cansandbox = CASPER_SUPPORT;
 715         else
 716                 cansandbox = false;
 717
 718         /*
 719          * Here we enter capability mode. Further down access to global
 720          * namespaces (e.g filesystem) is restricted (see capsicum(4)).
 721          * We must connect(2) our socket before this point.
 722          */
 723         if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
 724                 err(1, "cap_enter");
 725
 726         cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
 727         if (cap_rights_limit(srecv, &rights) < 0 && errno != ENOSYS)
 728                 err(1, "cap_rights_limit srecv");
 729
 730         cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT);
 731         if (cap_rights_limit(ssend, &rights) < 0 && errno != ENOSYS)
 732                 err(1, "cap_rights_limit ssend");
 733
 734         /* record route option */
 735         if (options & F_RROUTE) {
 736 #ifdef IP_OPTIONS
 737                 bzero(rspace, sizeof(rspace));
 738                 rspace[IPOPT_OPTVAL] = IPOPT_RR;
 739                 rspace[IPOPT_OLEN] = sizeof(rspace) - 1;
 740                 rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
 741                 rspace[sizeof(rspace) - 1] = IPOPT_EOL;
 742                 if (setsockopt(ssend, IPPROTO_IP, IP_OPTIONS, rspace,
 743                     sizeof(rspace)) < 0)
 744                         err(EX_OSERR, "setsockopt IP_OPTIONS");
 745 #else
 746                 errx(EX_UNAVAILABLE,
 747                     "record route not available in this implementation");
 748 #endif /* IP_OPTIONS */
 749         }
 750
 751         if (options & F_TTL) {
 752                 if (setsockopt(ssend, IPPROTO_IP, IP_TTL, &ttl,
 753                     sizeof(ttl)) < 0) {
 754                         err(EX_OSERR, "setsockopt IP_TTL");
 755                 }
 756         }
 757         if (options & F_NOLOOP) {
 758                 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
 759                     sizeof(loop)) < 0) {
 760                         err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
 761                 }
 762         }
 763         if (options & F_MTTL) {
 764                 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_TTL, &mttl,
 765                     sizeof(mttl)) < 0) {
 766                         err(EX_OSERR, "setsockopt IP_MULTICAST_TTL");
 767                 }
 768         }
 769         if (options & F_MIF) {
 770                 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
 771                     sizeof(ifaddr)) < 0) {
 772                         err(EX_OSERR, "setsockopt IP_MULTICAST_IF");
 773                 }
 774         }
 775 #ifdef SO_TIMESTAMP
 776         { int on = 1;
 777         if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0)
 778                 err(EX_OSERR, "setsockopt SO_TIMESTAMP");
 779         }
 780 #endif
 781         if (sweepmax) {
 782                 if (sweepmin > sweepmax)
 783                         errx(EX_USAGE, "Maximum packet size must be no less than the minimum packet size");
 784
 785                 if (datalen != DEFDATALEN)
 786                         errx(EX_USAGE, "Packet size and ping sweep are mutually exclusive");
 787
 788                 if (npackets > 0) {
 789                         snpackets = npackets;
 790                         npackets = 0;
 791                 } else
 792                         snpackets = 1;
 793                 datalen = sweepmin;
 794                 send_len = icmp_len + sweepmin;
 795         }
 796         if (options & F_SWEEP && !sweepmax)
 797                 errx(EX_USAGE, "Maximum sweep size must be specified");
 798
 799         /*
 800          * When pinging the broadcast address, you can get a lot of answers.
 801          * Doing something so evil is useful if you are trying to stress the
 802          * ethernet, or just want to fill the arp cache to get some stuff for
 803          * /etc/ethers.  But beware: RFC 1122 allows hosts to ignore broadcast
 804          * or multicast pings if they wish.
 805          */
 806
 807         /*
 808          * XXX receive buffer needs undetermined space for mbuf overhead
 809          * as well.
 810          */
 811         hold = IP_MAXPACKET + 128;
 812         (void)setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
 813             sizeof(hold));
 814         /* CAP_SETSOCKOPT removed */
 815         cap_rights_init(&rights, CAP_RECV, CAP_EVENT);
 816         if (cap_rights_limit(srecv, &rights) < 0 && errno != ENOSYS)
 817                 err(1, "cap_rights_limit srecv setsockopt");
 818         if (uid == 0)
 819                 (void)setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
 820                     sizeof(hold));
 821         /* CAP_SETSOCKOPT removed */
 822         cap_rights_init(&rights, CAP_SEND);
 823         if (cap_rights_limit(ssend, &rights) < 0 && errno != ENOSYS)
 824                 err(1, "cap_rights_limit ssend setsockopt");
 825
 826         if (to->sin_family == AF_INET) {
 827                 (void)printf("PING %s (%s)", hostname,
 828                     inet_ntoa(to->sin_addr));
 829                 if (source)
 830                         (void)printf(" from %s", shostname);
 831                 if (sweepmax)
 832                         (void)printf(": (%d ... %d) data bytes\n",
 833                             sweepmin, sweepmax);
 834                 else
 835                         (void)printf(": %d data bytes\n", datalen);
 836
 837         } else {
 838                 if (sweepmax)
 839                         (void)printf("PING %s: (%d ... %d) data bytes\n",
 840                             hostname, sweepmin, sweepmax);
 841                 else
 842                         (void)printf("PING %s: %d data bytes\n", hostname, datalen);
 843         }
 844
 845         /*
 846          * Use sigaction() instead of signal() to get unambiguous semantics,
 847          * in particular with SA_RESTART not set.
 848          */
 849
 850         sigemptyset(&si_sa.sa_mask);
 851         si_sa.sa_flags = 0;
 852
 853         si_sa.sa_handler = stopit;
 854         if (sigaction(SIGINT, &si_sa, 0) == -1) {
 855                 err(EX_OSERR, "sigaction SIGINT");
 856         }
 857
 858         si_sa.sa_handler = status;
 859         if (sigaction(SIGINFO, &si_sa, 0) == -1) {
 860                 err(EX_OSERR, "sigaction");
 861         }
 862
 863         if (alarmtimeout > 0) {
 864                 si_sa.sa_handler = stopit;
 865                 if (sigaction(SIGALRM, &si_sa, 0) == -1)
 866                         err(EX_OSERR, "sigaction SIGALRM");
 867         }
 868
 869         bzero(&msg, sizeof(msg));
 870         msg.msg_name = (caddr_t)&from;
 871         msg.msg_iov = &iov;
 872         msg.msg_iovlen = 1;
 873 #ifdef SO_TIMESTAMP
 874         msg.msg_control = (caddr_t)ctrl;
 875 #endif
 876         iov.iov_base = packet;
 877         iov.iov_len = IP_MAXPACKET;
 878
 879         if (preload == 0)
 880                 pinger();               /* send the first ping */
 881         else {
 882                 if (npackets != 0 && preload > npackets)
 883                         preload = npackets;
 884                 while (preload--)       /* fire off them quickies */
 885                         pinger();
 886         }
 887         (void)gettimeofday(&last, NULL);
 888
 889         if (options & F_FLOOD) {
 890                 intvl.tv_sec = 0;
 891                 intvl.tv_usec = 10000;
 892         } else {
 893                 intvl.tv_sec = interval / 1000;
 894                 intvl.tv_usec = interval % 1000 * 1000;
 895         }
 896
 897         almost_done = 0;
 898         while (!finish_up) {
 899                 struct timeval now, timeout;
 900                 fd_set rfds;
 901                 int cc, n;
 902
 903                 check_status();
 904                 if ((unsigned)srecv >= FD_SETSIZE)
 905                         errx(EX_OSERR, "descriptor too large");
 906                 FD_ZERO(&rfds);
 907                 FD_SET(srecv, &rfds);
 908                 (void)gettimeofday(&now, NULL);
 909                 timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec;
 910                 timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec;
 911                 while (timeout.tv_usec < 0) {
 912                         timeout.tv_usec += 1000000;
 913                         timeout.tv_sec--;
 914                 }
 915                 while (timeout.tv_usec >= 1000000) {
 916                         timeout.tv_usec -= 1000000;
 917                         timeout.tv_sec++;
 918                 }
 919                 if (timeout.tv_sec < 0)
 920                         timerclear(&timeout);
 921                 n = select(srecv + 1, &rfds, NULL, NULL, &timeout);
 922                 if (n < 0)
 923                         continue;       /* Must be EINTR. */
 924                 if (n == 1) {
 925                         struct timeval *tv = NULL;
 926 #ifdef SO_TIMESTAMP
 927                         struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl;
 928
 929                         msg.msg_controllen = sizeof(ctrl);
 930 #endif
 931                         msg.msg_namelen = sizeof(from);
 932                         if ((cc = recvmsg(srecv, &msg, 0)) < 0) {
 933                                 if (errno == EINTR)
 934                                         continue;
 935                                 warn("recvmsg");
 936                                 continue;
 937                         }
 938 #ifdef SO_TIMESTAMP
 939                         if (cmsg->cmsg_level == SOL_SOCKET &&
 940                             cmsg->cmsg_type == SCM_TIMESTAMP &&
 941                             cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
 942                                 /* Copy to avoid alignment problems: */
 943                                 memcpy(&now, CMSG_DATA(cmsg), sizeof(now));
 944                                 tv = &now;
 945                         }
 946 #endif
 947                         if (tv == NULL) {
 948                                 (void)gettimeofday(&now, NULL);
 949                                 tv = &now;
 950                         }
 951                         pr_pack((char *)packet, cc, &from, tv);
 952                         if ((options & F_ONCE && nreceived) ||
 953                             (npackets && nreceived >= npackets))
 954                                 break;
 955                 }
 956                 if (n == 0 || options & F_FLOOD) {
 957                         if (sweepmax && sntransmitted == snpackets) {
 958                                 for (i = 0; i < sweepincr ; ++i)
 959                                         *datap++ = i;
 960                                 datalen += sweepincr;
 961                                 if (datalen > sweepmax)
 962                                         break;
 963                                 send_len = icmp_len + datalen;
 964                                 sntransmitted = 0;
 965                         }
 966                         if (!npackets || ntransmitted < npackets)
 967                                 pinger();
 968                         else {
 969                                 if (almost_done)
 970                                         break;
 971                                 almost_done = 1;
 972                                 intvl.tv_usec = 0;
 973                                 if (nreceived) {
 974                                         intvl.tv_sec = 2 * tmax / 1000;
 975                                         if (!intvl.tv_sec)
 976                                                 intvl.tv_sec = 1;
 977                                 } else {
 978                                         intvl.tv_sec = waittime / 1000;
 979                                         intvl.tv_usec = waittime % 1000 * 1000;
 980                                 }
 981                         }
 982                         (void)gettimeofday(&last, NULL);
 983                         if (ntransmitted - nreceived - 1 > nmissedmax) {
 984                                 nmissedmax = ntransmitted - nreceived - 1;
 985                                 if (options & F_MISSED)
 986                                         (void)write(STDOUT_FILENO, &BBELL, 1);
 987                         }
 988                 }
 989         }
 990         finish();
 991         /* NOTREACHED */
 992         exit(0);        /* Make the compiler happy */
 993 }
 994
 995 /*
 996  * stopit --
 997  *      Set the global bit that causes the main loop to quit.
 998  * Do NOT call finish() from here, since finish() does far too much
 999  * to be called from a signal handler.
1000  */
1001 void
1002 stopit(int sig __unused)
1003 {
1004
1005         /*
1006          * When doing reverse DNS lookups, the finish_up flag might not
1007          * be noticed for a while.  Just exit if we get a second SIGINT.
1008          */
1009         if (!(options & F_NUMERIC) && finish_up)
1010                 _exit(nreceived ? 0 : 2);
1011         finish_up = 1;
1012 }
1013
1014 /*
1015  * pinger --
1016  *      Compose and transmit an ICMP ECHO REQUEST packet.  The IP packet
1017  * will be added on by the kernel.  The ID field is our UNIX process ID,
1018  * and the sequence number is an ascending integer.  The first TIMEVAL_LEN
1019  * bytes of the data portion are used to hold a UNIX "timeval" struct in
1020  * host byte-order, to compute the round-trip time.
1021  */
1022 static void
1023 pinger(void)
1024 {
1025         struct timeval now;
1026         struct tv32 tv32;
1027         struct ip *ip;
1028         struct icmp *icp;
1029         int cc, i;
1030         u_char *packet;
1031
1032         packet = outpack;
1033         icp = (struct icmp *)outpack;
1034         icp->icmp_type = icmp_type;
1035         icp->icmp_code = 0;
1036         icp->icmp_cksum = 0;
1037         icp->icmp_seq = htons(ntransmitted);
1038         icp->icmp_id = ident;                   /* ID */
1039
1040         CLR(ntransmitted % mx_dup_ck);
1041
1042         if ((options & F_TIME) || timing) {
1043                 (void)gettimeofday(&now, NULL);
1044
1045                 tv32.tv32_sec = htonl(now.tv_sec);
1046                 tv32.tv32_usec = htonl(now.tv_usec);
1047                 if (options & F_TIME)
1048                         icp->icmp_otime = htonl((now.tv_sec % (24*60*60))
1049                                 * 1000 + now.tv_usec / 1000);
1050                 if (timing)
1051                         bcopy((void *)&tv32,
1052                             (void *)&outpack[ICMP_MINLEN + phdr_len],
1053                             sizeof(tv32));
1054         }
1055
1056         cc = ICMP_MINLEN + phdr_len + datalen;
1057
1058         /* compute ICMP checksum here */
1059         icp->icmp_cksum = in_cksum((u_short *)icp, cc);
1060
1061         if (options & F_HDRINCL) {
1062                 cc += sizeof(struct ip);
1063                 ip = (struct ip *)outpackhdr;
1064                 ip->ip_len = htons(cc);
1065                 ip->ip_sum = in_cksum((u_short *)outpackhdr, cc);
1066                 packet = outpackhdr;
1067         }
1068         i = send(ssend, (char *)packet, cc, 0);
1069         if (i < 0 || i != cc)  {
1070                 if (i < 0) {
1071                         if (options & F_FLOOD && errno == ENOBUFS) {
1072                                 usleep(FLOOD_BACKOFF);
1073                                 return;
1074                         }
1075                         warn("sendto");
1076                 } else {
1077                         warn("%s: partial write: %d of %d bytes",
1078                              hostname, i, cc);
1079                 }
1080         }
1081         ntransmitted++;
1082         sntransmitted++;
1083         if (!(options & F_QUIET) && options & F_FLOOD)
1084                 (void)write(STDOUT_FILENO, &DOT, 1);
1085 }
1086
1087 /*
1088  * pr_pack --
1089  *      Print out the packet, if it came from us.  This logic is necessary
1090  * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
1091  * which arrive ('tis only fair).  This permits multiple copies of this
1092  * program to be run without having intermingled output (or statistics!).
1093  */
1094 static void
1095 pr_pack(char *buf, int cc, struct sockaddr_in *from, struct timeval *tv)
1096 {
1097         struct in_addr ina;
1098         u_char *cp, *dp;
1099         struct icmp *icp;
1100         struct ip *ip;
1101         const void *tp;
1102         double triptime;
1103         int dupflag, hlen, i, j, recv_len, seq;
1104         static int old_rrlen;
1105         static char old_rr[MAX_IPOPTLEN];
1106
1107         /* Check the IP header */
1108         ip = (struct ip *)buf;
1109         hlen = ip->ip_hl << 2;
1110         recv_len = cc;
1111         if (cc < hlen + ICMP_MINLEN) {
1112                 if (options & F_VERBOSE)
1113                         warn("packet too short (%d bytes) from %s", cc,
1114                              inet_ntoa(from->sin_addr));
1115                 return;
1116         }
1117
1118         /* Now the ICMP part */
1119         cc -= hlen;
1120         icp = (struct icmp *)(buf + hlen);
1121         if (icp->icmp_type == icmp_type_rsp) {
1122                 if (icp->icmp_id != ident)
1123                         return;                 /* 'Twas not our ECHO */
1124                 ++nreceived;
1125                 triptime = 0.0;
1126                 if (timing) {
1127                         struct timeval tv1;
1128                         struct tv32 tv32;
1129 #ifndef icmp_data
1130                         tp = &icp->icmp_ip;
1131 #else
1132                         tp = icp->icmp_data;
1133 #endif
1134                         tp = (const char *)tp + phdr_len;
1135
1136                         if ((size_t)(cc - ICMP_MINLEN - phdr_len) >=
1137                             sizeof(tv1)) {
1138                                 /* Copy to avoid alignment problems: */
1139                                 memcpy(&tv32, tp, sizeof(tv32));
1140                                 tv1.tv_sec = ntohl(tv32.tv32_sec);
1141                                 tv1.tv_usec = ntohl(tv32.tv32_usec);
1142                                 tvsub(tv, &tv1);
1143                                 triptime = ((double)tv->tv_sec) * 1000.0 +
1144                                     ((double)tv->tv_usec) / 1000.0;
1145                                 tsum += triptime;
1146                                 tsumsq += triptime * triptime;
1147                                 if (triptime < tmin)
1148                                         tmin = triptime;
1149                                 if (triptime > tmax)
1150                                         tmax = triptime;
1151                         } else
1152                                 timing = 0;
1153                 }
1154
1155                 seq = ntohs(icp->icmp_seq);
1156
1157                 if (TST(seq % mx_dup_ck)) {
1158                         ++nrepeats;
1159                         --nreceived;
1160                         dupflag = 1;
1161                 } else {
1162                         SET(seq % mx_dup_ck);
1163                         dupflag = 0;
1164                 }
1165
1166                 if (options & F_QUIET)
1167                         return;
1168
1169                 if (options & F_WAITTIME && triptime > waittime) {
1170                         ++nrcvtimeout;
1171                         return;
1172                 }
1173
1174                 if (options & F_FLOOD)
1175                         (void)write(STDOUT_FILENO, &BSPACE, 1);
1176                 else {
1177                         (void)printf("%d bytes from %s: icmp_seq=%u", cc,
1178                            inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
1179                            seq);
1180                         (void)printf(" ttl=%d", ip->ip_ttl);
1181                         if (timing)
1182                                 (void)printf(" time=%.3f ms", triptime);
1183                         if (dupflag)
1184                                 (void)printf(" (DUP!)");
1185                         if (options & F_AUDIBLE)
1186                                 (void)write(STDOUT_FILENO, &BBELL, 1);
1187                         if (options & F_MASK) {
1188                                 /* Just prentend this cast isn't ugly */
1189                                 (void)printf(" mask=%s",
1190                                         inet_ntoa(*(struct in_addr *)&(icp->icmp_mask)));
1191                         }
1192                         if (options & F_TIME) {
1193                                 (void)printf(" tso=%s", pr_ntime(icp->icmp_otime));
1194                                 (void)printf(" tsr=%s", pr_ntime(icp->icmp_rtime));
1195                                 (void)printf(" tst=%s", pr_ntime(icp->icmp_ttime));
1196                         }
1197                         if (recv_len != send_len) {
1198                                 (void)printf(
1199                                      "\nwrong total length %d instead of %d",
1200                                      recv_len, send_len);
1201                         }
1202                         /* check the data */
1203                         cp = (u_char*)&icp->icmp_data[phdr_len];
1204                         dp = &outpack[ICMP_MINLEN + phdr_len];
1205                         cc -= ICMP_MINLEN + phdr_len;
1206                         i = 0;
1207                         if (timing) {   /* don't check variable timestamp */
1208                                 cp += TIMEVAL_LEN;
1209                                 dp += TIMEVAL_LEN;
1210                                 cc -= TIMEVAL_LEN;
1211                                 i += TIMEVAL_LEN;
1212                         }
1213                         for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) {
1214                                 if (*cp != *dp) {
1215         (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
1216             i, *dp, *cp);
1217                                         (void)printf("\ncp:");
1218                                         cp = (u_char*)&icp->icmp_data[0];
1219                                         for (i = 0; i < datalen; ++i, ++cp) {
1220                                                 if ((i % 16) == 8)
1221                                                         (void)printf("\n\t");
1222                                                 (void)printf("%2x ", *cp);
1223                                         }
1224                                         (void)printf("\ndp:");
1225                                         cp = &outpack[ICMP_MINLEN];
1226                                         for (i = 0; i < datalen; ++i, ++cp) {
1227                                                 if ((i % 16) == 8)
1228                                                         (void)printf("\n\t");
1229                                                 (void)printf("%2x ", *cp);
1230                                         }
1231                                         break;
1232                                 }
1233                         }
1234                 }
1235         } else {
1236                 /*
1237                  * We've got something other than an ECHOREPLY.
1238                  * See if it's a reply to something that we sent.
1239                  * We can compare IP destination, protocol,
1240                  * and ICMP type and ID.
1241                  *
1242                  * Only print all the error messages if we are running
1243                  * as root to avoid leaking information not normally
1244                  * available to those not running as root.
1245                  */
1246 #ifndef icmp_data
1247                 struct ip *oip = &icp->icmp_ip;
1248 #else
1249                 struct ip *oip = (struct ip *)icp->icmp_data;
1250 #endif
1251                 struct icmp *oicmp = (struct icmp *)(oip + 1);
1252
1253                 if (((options & F_VERBOSE) && uid == 0) ||
1254                     (!(options & F_QUIET2) &&
1255                      (oip->ip_dst.s_addr == whereto.sin_addr.s_addr) &&
1256                      (oip->ip_p == IPPROTO_ICMP) &&
1257                      (oicmp->icmp_type == ICMP_ECHO) &&
1258                      (oicmp->icmp_id == ident))) {
1259                     (void)printf("%d bytes from %s: ", cc,
1260                         pr_addr(from->sin_addr));
1261                     pr_icmph(icp);
1262                 } else
1263                     return;
1264         }
1265
1266         /* Display any IP options */
1267         cp = (u_char *)buf + sizeof(struct ip);
1268
1269         for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
1270                 switch (*cp) {
1271                 case IPOPT_EOL:
1272                         hlen = 0;
1273                         break;
1274                 case IPOPT_LSRR:
1275                 case IPOPT_SSRR:
1276                         (void)printf(*cp == IPOPT_LSRR ?
1277                             "\nLSRR: " : "\nSSRR: ");
1278                         j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1;
1279                         hlen -= 2;
1280                         cp += 2;
1281                         if (j >= INADDR_LEN &&
1282                             j <= hlen - (int)sizeof(struct ip)) {
1283                                 for (;;) {
1284                                         bcopy(++cp, &ina.s_addr, INADDR_LEN);
1285                                         if (ina.s_addr == 0)
1286                                                 (void)printf("\t0.0.0.0");
1287                                         else
1288                                                 (void)printf("\t%s",
1289                                                      pr_addr(ina));
1290                                         hlen -= INADDR_LEN;
1291                                         cp += INADDR_LEN - 1;
1292                                         j -= INADDR_LEN;
1293                                         if (j < INADDR_LEN)
1294                                                 break;
1295                                         (void)putchar('\n');
1296                                 }
1297                         } else
1298                                 (void)printf("\t(truncated route)\n");
1299                         break;
1300                 case IPOPT_RR:
1301                         j = cp[IPOPT_OLEN];             /* get length */
1302                         i = cp[IPOPT_OFFSET];           /* and pointer */
1303                         hlen -= 2;
1304                         cp += 2;
1305                         if (i > j)
1306                                 i = j;
1307                         i = i - IPOPT_MINOFF + 1;
1308                         if (i < 0 || i > (hlen - (int)sizeof(struct ip))) {
1309                                 old_rrlen = 0;
1310                                 continue;
1311                         }
1312                         if (i == old_rrlen
1313                             && !bcmp((char *)cp, old_rr, i)
1314                             && !(options & F_FLOOD)) {
1315                                 (void)printf("\t(same route)");
1316                                 hlen -= i;
1317                                 cp += i;
1318                                 break;
1319                         }
1320                         old_rrlen = i;
1321                         bcopy((char *)cp, old_rr, i);
1322                         (void)printf("\nRR: ");
1323                         if (i >= INADDR_LEN &&
1324                             i <= hlen - (int)sizeof(struct ip)) {
1325                                 for (;;) {
1326                                         bcopy(++cp, &ina.s_addr, INADDR_LEN);
1327                                         if (ina.s_addr == 0)
1328                                                 (void)printf("\t0.0.0.0");
1329                                         else
1330                                                 (void)printf("\t%s",
1331                                                      pr_addr(ina));
1332                                         hlen -= INADDR_LEN;
1333                                         cp += INADDR_LEN - 1;
1334                                         i -= INADDR_LEN;
1335                                         if (i < INADDR_LEN)
1336                                                 break;
1337                                         (void)putchar('\n');
1338                                 }
1339                         } else
1340                                 (void)printf("\t(truncated route)");
1341                         break;
1342                 case IPOPT_NOP:
1343                         (void)printf("\nNOP");
1344                         break;
1345                 default:
1346                         (void)printf("\nunknown option %x", *cp);
1347                         break;
1348                 }
1349         if (!(options & F_FLOOD)) {
1350                 (void)putchar('\n');
1351                 (void)fflush(stdout);
1352         }
1353 }
1354
1355 /*
1356  * in_cksum --
1357  *      Checksum routine for Internet Protocol family headers (C Version)
1358  */
1359 u_short
1360 in_cksum(u_short *addr, int len)
1361 {
1362         int nleft, sum;
1363         u_short *w;
1364         union {
1365                 u_short us;
1366                 u_char  uc[2];
1367         } last;
1368         u_short answer;
1369
1370         nleft = len;
1371         sum = 0;
1372         w = addr;
1373
1374         /*
1375          * Our algorithm is simple, using a 32 bit accumulator (sum), we add
1376          * sequential 16 bit words to it, and at the end, fold back all the
1377          * carry bits from the top 16 bits into the lower 16 bits.
1378          */
1379         while (nleft > 1)  {
1380                 sum += *w++;
1381                 nleft -= 2;
1382         }
1383
1384         /* mop up an odd byte, if necessary */
1385         if (nleft == 1) {
1386                 last.uc[0] = *(u_char *)w;
1387                 last.uc[1] = 0;
1388                 sum += last.us;
1389         }
1390
1391         /* add back carry outs from top 16 bits to low 16 bits */
1392         sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
1393         sum += (sum >> 16);                     /* add carry */
1394         answer = ~sum;                          /* truncate to 16 bits */
1395         return(answer);
1396 }
1397
1398 /*
1399  * tvsub --
1400  *      Subtract 2 timeval structs:  out = out - in.  Out is assumed to
1401  * be >= in.
1402  */
1403 static void
1404 tvsub(struct timeval *out, const struct timeval *in)
1405 {
1406
1407         if ((out->tv_usec -= in->tv_usec) < 0) {
1408                 --out->tv_sec;
1409                 out->tv_usec += 1000000;
1410         }
1411         out->tv_sec -= in->tv_sec;
1412 }
1413
1414 /*
1415  * status --
1416  *      Print out statistics when SIGINFO is received.
1417  */
1418
1419 static void
1420 status(int sig __unused)
1421 {
1422
1423         siginfo_p = 1;
1424 }
1425
1426 static void
1427 check_status(void)
1428 {
1429
1430         if (siginfo_p) {
1431                 siginfo_p = 0;
1432                 (void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)",
1433                     nreceived, ntransmitted,
1434                     ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0);
1435                 if (nreceived && timing)
1436                         (void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max",
1437                             tmin, tsum / (nreceived + nrepeats), tmax);
1438                 (void)fprintf(stderr, "\n");
1439         }
1440 }
1441
1442 /*
1443  * finish --
1444  *      Print out statistics, and give up.
1445  */
1446 static void
1447 finish(void)
1448 {
1449
1450         (void)signal(SIGINT, SIG_IGN);
1451         (void)signal(SIGALRM, SIG_IGN);
1452         (void)putchar('\n');
1453         (void)fflush(stdout);
1454         (void)printf("--- %s ping statistics ---\n", hostname);
1455         (void)printf("%ld packets transmitted, ", ntransmitted);
1456         (void)printf("%ld packets received, ", nreceived);
1457         if (nrepeats)
1458                 (void)printf("+%ld duplicates, ", nrepeats);
1459         if (ntransmitted) {
1460                 if (nreceived > ntransmitted)
1461                         (void)printf("-- somebody's printing up packets!");
1462                 else
1463                         (void)printf("%.1f%% packet loss",
1464                             ((ntransmitted - nreceived) * 100.0) /
1465                             ntransmitted);
1466         }
1467         if (nrcvtimeout)
1468                 (void)printf(", %ld packets out of wait time", nrcvtimeout);
1469         (void)putchar('\n');
1470         if (nreceived && timing) {
1471                 double n = nreceived + nrepeats;
1472                 double avg = tsum / n;
1473                 double vari = tsumsq / n - avg * avg;
1474                 (void)printf(
1475                     "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n",
1476                     tmin, avg, tmax, sqrt(vari));
1477         }
1478
1479         if (nreceived)
1480                 exit(0);
1481         else
1482                 exit(2);
1483 }
1484
1485 #ifdef notdef
1486 static char *ttab[] = {
1487         "Echo Reply",           /* ip + seq + udata */
1488         "Dest Unreachable",     /* net, host, proto, port, frag, sr + IP */
1489         "Source Quench",        /* IP */
1490         "Redirect",             /* redirect type, gateway, + IP  */
1491         "Echo",
1492         "Time Exceeded",        /* transit, frag reassem + IP */
1493         "Parameter Problem",    /* pointer + IP */
1494         "Timestamp",            /* id + seq + three timestamps */
1495         "Timestamp Reply",      /* " */
1496         "Info Request",         /* id + sq */
1497         "Info Reply"            /* " */
1498 };
1499 #endif
1500
1501 /*
1502  * pr_icmph --
1503  *      Print a descriptive string about an ICMP header.
1504  */
1505 static void
1506 pr_icmph(struct icmp *icp)
1507 {
1508
1509         switch(icp->icmp_type) {
1510         case ICMP_ECHOREPLY:
1511                 (void)printf("Echo Reply\n");
1512                 /* XXX ID + Seq + Data */
1513                 break;
1514         case ICMP_UNREACH:
1515                 switch(icp->icmp_code) {
1516                 case ICMP_UNREACH_NET:
1517                         (void)printf("Destination Net Unreachable\n");
1518                         break;
1519                 case ICMP_UNREACH_HOST:
1520                         (void)printf("Destination Host Unreachable\n");
1521                         break;
1522                 case ICMP_UNREACH_PROTOCOL:
1523                         (void)printf("Destination Protocol Unreachable\n");
1524                         break;
1525                 case ICMP_UNREACH_PORT:
1526                         (void)printf("Destination Port Unreachable\n");
1527                         break;
1528                 case ICMP_UNREACH_NEEDFRAG:
1529                         (void)printf("frag needed and DF set (MTU %d)\n",
1530                                         ntohs(icp->icmp_nextmtu));
1531                         break;
1532                 case ICMP_UNREACH_SRCFAIL:
1533                         (void)printf("Source Route Failed\n");
1534                         break;
1535                 case ICMP_UNREACH_FILTER_PROHIB:
1536                         (void)printf("Communication prohibited by filter\n");
1537                         break;
1538                 default:
1539                         (void)printf("Dest Unreachable, Bad Code: %d\n",
1540                             icp->icmp_code);
1541                         break;
1542                 }
1543                 /* Print returned IP header information */
1544 #ifndef icmp_data
1545                 pr_retip(&icp->icmp_ip);
1546 #else
1547                 pr_retip((struct ip *)icp->icmp_data);
1548 #endif
1549                 break;
1550         case ICMP_SOURCEQUENCH:
1551                 (void)printf("Source Quench\n");
1552 #ifndef icmp_data
1553                 pr_retip(&icp->icmp_ip);
1554 #else
1555                 pr_retip((struct ip *)icp->icmp_data);
1556 #endif
1557                 break;
1558         case ICMP_REDIRECT:
1559                 switch(icp->icmp_code) {
1560                 case ICMP_REDIRECT_NET:
1561                         (void)printf("Redirect Network");
1562                         break;
1563                 case ICMP_REDIRECT_HOST:
1564                         (void)printf("Redirect Host");
1565                         break;
1566                 case ICMP_REDIRECT_TOSNET:
1567                         (void)printf("Redirect Type of Service and Network");
1568                         break;
1569                 case ICMP_REDIRECT_TOSHOST:
1570                         (void)printf("Redirect Type of Service and Host");
1571                         break;
1572                 default:
1573                         (void)printf("Redirect, Bad Code: %d", icp->icmp_code);
1574                         break;
1575                 }
1576                 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
1577 #ifndef icmp_data
1578                 pr_retip(&icp->icmp_ip);
1579 #else
1580                 pr_retip((struct ip *)icp->icmp_data);
1581 #endif
1582                 break;
1583         case ICMP_ECHO:
1584                 (void)printf("Echo Request\n");
1585                 /* XXX ID + Seq + Data */
1586                 break;
1587         case ICMP_TIMXCEED:
1588                 switch(icp->icmp_code) {
1589                 case ICMP_TIMXCEED_INTRANS:
1590                         (void)printf("Time to live exceeded\n");
1591                         break;
1592                 case ICMP_TIMXCEED_REASS:
1593                         (void)printf("Frag reassembly time exceeded\n");
1594                         break;
1595                 default:
1596                         (void)printf("Time exceeded, Bad Code: %d\n",
1597                             icp->icmp_code);
1598                         break;
1599                 }
1600 #ifndef icmp_data
1601                 pr_retip(&icp->icmp_ip);
1602 #else
1603                 pr_retip((struct ip *)icp->icmp_data);
1604 #endif
1605                 break;
1606         case ICMP_PARAMPROB:
1607                 (void)printf("Parameter problem: pointer = 0x%02x\n",
1608                     icp->icmp_hun.ih_pptr);
1609 #ifndef icmp_data
1610                 pr_retip(&icp->icmp_ip);
1611 #else
1612                 pr_retip((struct ip *)icp->icmp_data);
1613 #endif
1614                 break;
1615         case ICMP_TSTAMP:
1616                 (void)printf("Timestamp\n");
1617                 /* XXX ID + Seq + 3 timestamps */
1618                 break;
1619         case ICMP_TSTAMPREPLY:
1620                 (void)printf("Timestamp Reply\n");
1621                 /* XXX ID + Seq + 3 timestamps */
1622                 break;
1623         case ICMP_IREQ:
1624                 (void)printf("Information Request\n");
1625                 /* XXX ID + Seq */
1626                 break;
1627         case ICMP_IREQREPLY:
1628                 (void)printf("Information Reply\n");
1629                 /* XXX ID + Seq */
1630                 break;
1631         case ICMP_MASKREQ:
1632                 (void)printf("Address Mask Request\n");
1633                 break;
1634         case ICMP_MASKREPLY:
1635                 (void)printf("Address Mask Reply\n");
1636                 break;
1637         case ICMP_ROUTERADVERT:
1638                 (void)printf("Router Advertisement\n");
1639                 break;
1640         case ICMP_ROUTERSOLICIT:
1641                 (void)printf("Router Solicitation\n");
1642                 break;
1643         default:
1644                 (void)printf("Bad ICMP type: %d\n", icp->icmp_type);
1645         }
1646 }
1647
1648 /*
1649  * pr_iph --
1650  *      Print an IP header with options.
1651  */
1652 static void
1653 pr_iph(struct ip *ip)
1654 {
1655         struct in_addr ina;
1656         u_char *cp;
1657         int hlen;
1658
1659         hlen = ip->ip_hl << 2;
1660         cp = (u_char *)ip + 20;         /* point to options */
1661
1662         (void)printf("Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst\n");
1663         (void)printf(" %1x  %1x  %02x %04x %04x",
1664             ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
1665             ntohs(ip->ip_id));
1666         (void)printf("   %1lx %04lx",
1667             (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13,
1668             (u_long) ntohl(ip->ip_off) & 0x1fff);
1669         (void)printf("  %02x  %02x %04x", ip->ip_ttl, ip->ip_p,
1670                                                             ntohs(ip->ip_sum));
1671         memcpy(&ina, &ip->ip_src.s_addr, sizeof ina);
1672         (void)printf(" %s ", inet_ntoa(ina));
1673         memcpy(&ina, &ip->ip_dst.s_addr, sizeof ina);
1674         (void)printf(" %s ", inet_ntoa(ina));
1675         /* dump any option bytes */
1676         while (hlen-- > 20) {
1677                 (void)printf("%02x", *cp++);
1678         }
1679         (void)putchar('\n');
1680 }
1681
1682 /*
1683  * pr_addr --
1684  *      Return an ascii host address as a dotted quad and optionally with
1685  * a hostname.
1686  */
1687 static char *
1688 pr_addr(struct in_addr ina)
1689 {
1690         struct hostent *hp;
1691         static char buf[16 + 3 + MAXHOSTNAMELEN];
1692
1693         if (options & F_NUMERIC)
1694                 return inet_ntoa(ina);
1695
1696         if (capdns != NULL)
1697                 hp = cap_gethostbyaddr(capdns, (char *)&ina, 4, AF_INET);
1698         else
1699                 hp = gethostbyaddr((char *)&ina, 4, AF_INET);
1700
1701         if (hp == NULL)
1702                 return inet_ntoa(ina);
1703
1704         (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
1705             inet_ntoa(ina));
1706         return(buf);
1707 }
1708
1709 /*
1710  * pr_retip --
1711  *      Dump some info on a returned (via ICMP) IP packet.
1712  */
1713 static void
1714 pr_retip(struct ip *ip)
1715 {
1716         u_char *cp;
1717         int hlen;
1718
1719         pr_iph(ip);
1720         hlen = ip->ip_hl << 2;
1721         cp = (u_char *)ip + hlen;
1722
1723         if (ip->ip_p == 6)
1724                 (void)printf("TCP: from port %u, to port %u (decimal)\n",
1725                     (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
1726         else if (ip->ip_p == 17)
1727                 (void)printf("UDP: from port %u, to port %u (decimal)\n",
1728                         (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
1729 }
1730
1731 static char *
1732 pr_ntime(n_time timestamp)
1733 {
1734         static char buf[10];
1735         int hour, min, sec;
1736
1737         sec = ntohl(timestamp) / 1000;
1738         hour = sec / 60 / 60;
1739         min = (sec % (60 * 60)) / 60;
1740         sec = (sec % (60 * 60)) % 60;
1741
1742         (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec);
1743
1744         return (buf);
1745 }
1746
1747 static void
1748 fill(char *bp, char *patp)
1749 {
1750         char *cp;
1751         int pat[16];
1752         u_int ii, jj, kk;
1753
1754         for (cp = patp; *cp; cp++) {
1755                 if (!isxdigit(*cp))
1756                         errx(EX_USAGE,
1757                             "patterns must be specified as hex digits");
1758
1759         }
1760         ii = sscanf(patp,
1761             "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
1762             &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
1763             &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
1764             &pat[13], &pat[14], &pat[15]);
1765
1766         if (ii > 0)
1767                 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii)
1768                         for (jj = 0; jj < ii; ++jj)
1769                                 bp[jj + kk] = pat[jj];
1770         if (!(options & F_QUIET)) {
1771                 (void)printf("PATTERN: 0x");
1772                 for (jj = 0; jj < ii; ++jj)
1773                         (void)printf("%02x", bp[jj] & 0xFF);
1774                 (void)printf("\n");
1775         }
1776 }
1777
1778 static cap_channel_t *
1779 capdns_setup(void)
1780 {
1781         cap_channel_t *capcas, *capdnsloc;
1782         const char *types[2];
1783         int families[1];
1784
1785         capcas = cap_init();
1786         if (capcas == NULL)
1787                 err(1, "unable to create casper process");
1788         capdnsloc = cap_service_open(capcas, "system.dns");
1789         /* Casper capability no longer needed. */
1790         cap_close(capcas);
1791         if (capdnsloc == NULL)
1792                 err(1, "unable to open system.dns service");
1793         types[0] = "NAME";
1794         types[1] = "ADDR";
1795         if (cap_dns_type_limit(capdnsloc, types, 2) < 0)
1796                 err(1, "unable to limit access to system.dns service");
1797         families[0] = AF_INET;
1798         if (cap_dns_family_limit(capdnsloc, families, 1) < 0)
1799                 err(1, "unable to limit access to system.dns service");
1800
1801         return (capdnsloc);
1802 }
1803
1804 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
1805 #define SECOPT          " [-P policy]"
1806 #else
1807 #define SECOPT          ""
1808 #endif
1809 static void
1810 usage(void)
1811 {
1812
1813         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1814 "usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
1815 "            [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
1816 "           " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
1817 "            [-W waittime] [-z tos] host",
1818 "       ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
1819 "            [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
1820 "            [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
1821 "            [-z tos] mcast-group");
1822         exit(EX_USAGE);
1823 }