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;
 246         long ltmp;
 247         int almost_done, ch, df, hold, i, icmp_len, mib[4], preload;
 248         int ssend_errno, srecv_errno, tos, ttl;
 249         char ctrl[CMSG_SPACE(sizeof(struct timeval))];
 250         char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN];
 251 #ifdef IP_OPTIONS
 252         char rspace[MAX_IPOPTLEN];      /* record route space */
 253 #endif
 254         unsigned char loop, mttl;
 255
 256         payload = source = NULL;
 257 #ifdef IPSEC_POLICY_IPSEC
 258         policy_in = policy_out = NULL;
 259 #endif
 260         cap_rights_t rights;
 261         bool cansandbox;
 262
 263         /*
 264          * Do the stuff that we need root priv's for *first*, and
 265          * then drop our setuid bit.  Save error reporting for
 266          * after arg parsing.
 267          *
 268          * Historicaly ping was using one socket 's' for sending and for
 269          * receiving. After capsicum(4) related changes we use two
 270          * sockets. It was done for special ping use case - when user
 271          * issue ping on multicast or broadcast address replies come
 272          * from different addresses, not from the address we
 273          * connect(2)'ed to, and send socket do not receive those
 274          * packets.
 275          */
 276         ssend = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 277         ssend_errno = errno;
 278         srecv = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 279         srecv_errno = errno;
 280
 281         if (setuid(getuid()) != 0)
 282                 err(EX_NOPERM, "setuid() failed");
 283         uid = getuid();
 284
 285         if (ssend < 0) {
 286                 errno = ssend_errno;
 287                 err(EX_OSERR, "ssend socket");
 288         }
 289
 290         if (srecv < 0) {
 291                 errno = srecv_errno;
 292                 err(EX_OSERR, "srecv socket");
 293         }
 294
 295         alarmtimeout = df = preload = tos = 0;
 296
 297         outpack = outpackhdr + sizeof(struct ip);
 298         while ((ch = getopt(argc, argv,
 299                 "Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
 300 #ifdef IPSEC
 301 #ifdef IPSEC_POLICY_IPSEC
 302                 "P:"
 303 #endif /*IPSEC_POLICY_IPSEC*/
 304 #endif /*IPSEC*/
 305                 )) != -1)
 306         {
 307                 switch(ch) {
 308                 case 'A':
 309                         options |= F_MISSED;
 310                         break;
 311                 case 'a':
 312                         options |= F_AUDIBLE;
 313                         break;
 314                 case 'c':
 315                         ltmp = strtol(optarg, &ep, 0);
 316                         if (*ep || ep == optarg || ltmp <= 0)
 317                                 errx(EX_USAGE,
 318                                     "invalid count of packets to transmit: `%s'",
 319                                     optarg);
 320                         npackets = ltmp;
 321                         break;
 322                 case 'D':
 323                         options |= F_HDRINCL;
 324                         df = 1;
 325                         break;
 326                 case 'd':
 327                         options |= F_SO_DEBUG;
 328                         break;
 329                 case 'f':
 330                         if (uid) {
 331                                 errno = EPERM;
 332                                 err(EX_NOPERM, "-f flag");
 333                         }
 334                         options |= F_FLOOD;
 335                         setbuf(stdout, (char *)NULL);
 336                         break;
 337                 case 'G': /* Maximum packet size for ping sweep */
 338                         ltmp = strtol(optarg, &ep, 0);
 339                         if (*ep || ep == optarg || ltmp <= 0)
 340                                 errx(EX_USAGE, "invalid packet size: `%s'",
 341                                     optarg);
 342                         if (uid != 0 && ltmp > DEFDATALEN) {
 343                                 errno = EPERM;
 344                                 err(EX_NOPERM,
 345                                     "packet size too large: %ld > %u",
 346                                     ltmp, DEFDATALEN);
 347                         }
 348                         options |= F_SWEEP;
 349                         sweepmax = ltmp;
 350                         break;
 351                 case 'g': /* Minimum packet size for ping sweep */
 352                         ltmp = strtol(optarg, &ep, 0);
 353                         if (*ep || ep == optarg || ltmp <= 0)
 354                                 errx(EX_USAGE, "invalid packet size: `%s'",
 355                                     optarg);
 356                         if (uid != 0 && ltmp > DEFDATALEN) {
 357                                 errno = EPERM;
 358                                 err(EX_NOPERM,
 359                                     "packet size too large: %ld > %u",
 360                                     ltmp, DEFDATALEN);
 361                         }
 362                         options |= F_SWEEP;
 363                         sweepmin = ltmp;
 364                         break;
 365                 case 'h': /* Packet size increment for ping sweep */
 366                         ltmp = strtol(optarg, &ep, 0);
 367                         if (*ep || ep == optarg || ltmp < 1)
 368                                 errx(EX_USAGE, "invalid increment size: `%s'",
 369                                     optarg);
 370                         if (uid != 0 && ltmp > DEFDATALEN) {
 371                                 errno = EPERM;
 372                                 err(EX_NOPERM,
 373                                     "packet size too large: %ld > %u",
 374                                     ltmp, DEFDATALEN);
 375                         }
 376                         options |= F_SWEEP;
 377                         sweepincr = ltmp;
 378                         break;
 379                 case 'I':               /* multicast interface */
 380                         if (inet_aton(optarg, &ifaddr) == 0)
 381                                 errx(EX_USAGE,
 382                                     "invalid multicast interface: `%s'",
 383                                     optarg);
 384                         options |= F_MIF;
 385                         break;
 386                 case 'i':               /* wait between sending packets */
 387                         t = strtod(optarg, &ep) * 1000.0;
 388                         if (*ep || ep == optarg || t > (double)INT_MAX)
 389                                 errx(EX_USAGE, "invalid timing interval: `%s'",
 390                                     optarg);
 391                         options |= F_INTERVAL;
 392                         interval = (int)t;
 393                         if (uid && interval < 1000) {
 394                                 errno = EPERM;
 395                                 err(EX_NOPERM, "-i interval too short");
 396                         }
 397                         break;
 398                 case 'L':
 399                         options |= F_NOLOOP;
 400                         loop = 0;
 401                         break;
 402                 case 'l':
 403                         ltmp = strtol(optarg, &ep, 0);
 404                         if (*ep || ep == optarg || ltmp > INT_MAX || ltmp < 0)
 405                                 errx(EX_USAGE,
 406                                     "invalid preload value: `%s'", optarg);
 407                         if (uid) {
 408                                 errno = EPERM;
 409                                 err(EX_NOPERM, "-l flag");
 410                         }
 411                         preload = ltmp;
 412                         break;
 413                 case 'M':
 414                         switch(optarg[0]) {
 415                         case 'M':
 416                         case 'm':
 417                                 options |= F_MASK;
 418                                 break;
 419                         case 'T':
 420                         case 't':
 421                                 options |= F_TIME;
 422                                 break;
 423                         default:
 424                                 errx(EX_USAGE, "invalid message: `%c'", optarg[0]);
 425                                 break;
 426                         }
 427                         break;
 428                 case 'm':               /* TTL */
 429                         ltmp = strtol(optarg, &ep, 0);
 430                         if (*ep || ep == optarg || ltmp > MAXTTL || ltmp < 0)
 431                                 errx(EX_USAGE, "invalid TTL: `%s'", optarg);
 432                         ttl = ltmp;
 433                         options |= F_TTL;
 434                         break;
 435                 case 'n':
 436                         options |= F_NUMERIC;
 437                         break;
 438                 case 'o':
 439                         options |= F_ONCE;
 440                         break;
 441 #ifdef IPSEC
 442 #ifdef IPSEC_POLICY_IPSEC
 443                 case 'P':
 444                         options |= F_POLICY;
 445                         if (!strncmp("in", optarg, 2))
 446                                 policy_in = strdup(optarg);
 447                         else if (!strncmp("out", optarg, 3))
 448                                 policy_out = strdup(optarg);
 449                         else
 450                                 errx(1, "invalid security policy");
 451                         break;
 452 #endif /*IPSEC_POLICY_IPSEC*/
 453 #endif /*IPSEC*/
 454                 case 'p':               /* fill buffer with user pattern */
 455                         options |= F_PINGFILLED;
 456                         payload = optarg;
 457                         break;
 458                 case 'Q':
 459                         options |= F_QUIET2;
 460                         break;
 461                 case 'q':
 462                         options |= F_QUIET;
 463                         break;
 464                 case 'R':
 465                         options |= F_RROUTE;
 466                         break;
 467                 case 'r':
 468                         options |= F_SO_DONTROUTE;
 469                         break;
 470                 case 'S':
 471                         source = optarg;
 472                         break;
 473                 case 's':               /* size of packet to send */
 474                         ltmp = strtol(optarg, &ep, 0);
 475                         if (*ep || ep == optarg || ltmp < 0)
 476                                 errx(EX_USAGE, "invalid packet size: `%s'",
 477                                     optarg);
 478                         if (uid != 0 && ltmp > DEFDATALEN) {
 479                                 errno = EPERM;
 480                                 err(EX_NOPERM,
 481                                     "packet size too large: %ld > %u",
 482                                     ltmp, DEFDATALEN);
 483                         }
 484                         datalen = ltmp;
 485                         break;
 486                 case 'T':               /* multicast TTL */
 487                         ltmp = strtol(optarg, &ep, 0);
 488                         if (*ep || ep == optarg || ltmp > MAXTTL || ltmp < 0)
 489                                 errx(EX_USAGE, "invalid multicast TTL: `%s'",
 490                                     optarg);
 491                         mttl = ltmp;
 492                         options |= F_MTTL;
 493                         break;
 494                 case 't':
 495                         alarmtimeout = strtoul(optarg, &ep, 0);
 496                         if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
 497                                 errx(EX_USAGE, "invalid timeout: `%s'",
 498                                     optarg);
 499                         if (alarmtimeout > MAXALARM)
 500                                 errx(EX_USAGE, "invalid timeout: `%s' > %d",
 501                                     optarg, MAXALARM);
 502                         alarm((int)alarmtimeout);
 503                         break;
 504                 case 'v':
 505                         options |= F_VERBOSE;
 506                         break;
 507                 case 'W':               /* wait ms for answer */
 508                         t = strtod(optarg, &ep);
 509                         if (*ep || ep == optarg || t > (double)INT_MAX)
 510                                 errx(EX_USAGE, "invalid timing interval: `%s'",
 511                                     optarg);
 512                         options |= F_WAITTIME;
 513                         waittime = (int)t;
 514                         break;
 515                 case 'z':
 516                         options |= F_HDRINCL;
 517                         ltmp = strtol(optarg, &ep, 0);
 518                         if (*ep || ep == optarg || ltmp > MAXTOS || ltmp < 0)
 519                                 errx(EX_USAGE, "invalid TOS: `%s'", optarg);
 520                         tos = ltmp;
 521                         break;
 522                 default:
 523                         usage();
 524                 }
 525         }
 526
 527         if (argc - optind != 1)
 528                 usage();
 529         target = argv[optind];
 530
 531         switch (options & (F_MASK|F_TIME)) {
 532         case 0: break;
 533         case F_MASK:
 534                 icmp_type = ICMP_MASKREQ;
 535                 icmp_type_rsp = ICMP_MASKREPLY;
 536                 phdr_len = MASK_LEN;
 537                 if (!(options & F_QUIET))
 538                         (void)printf("ICMP_MASKREQ\n");
 539                 break;
 540         case F_TIME:
 541                 icmp_type = ICMP_TSTAMP;
 542                 icmp_type_rsp = ICMP_TSTAMPREPLY;
 543                 phdr_len = TS_LEN;
 544                 if (!(options & F_QUIET))
 545                         (void)printf("ICMP_TSTAMP\n");
 546                 break;
 547         default:
 548                 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive.");
 549                 break;
 550         }
 551         icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len;
 552         if (options & F_RROUTE)
 553                 icmp_len += MAX_IPOPTLEN;
 554         maxpayload = IP_MAXPACKET - icmp_len;
 555         if (datalen > maxpayload)
 556                 errx(EX_USAGE, "packet size too large: %d > %d", datalen,
 557                     maxpayload);
 558         send_len = icmp_len + datalen;
 559         datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN];
 560         if (options & F_PINGFILLED) {
 561                 fill((char *)datap, payload);
 562         }
 563         capdns = capdns_setup();
 564         if (source) {
 565                 bzero((char *)&sock_in, sizeof(sock_in));
 566                 sock_in.sin_family = AF_INET;
 567                 if (inet_aton(source, &sock_in.sin_addr) != 0) {
 568                         shostname = source;
 569                 } else {
 570                         if (capdns != NULL)
 571                                 hp = cap_gethostbyname2(capdns, source,
 572                                     AF_INET);
 573                         else
 574                                 hp = gethostbyname2(source, AF_INET);
 575                         if (!hp)
 576                                 errx(EX_NOHOST, "cannot resolve %s: %s",
 577                                     source, hstrerror(h_errno));
 578
 579                         sock_in.sin_len = sizeof sock_in;
 580                         if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) ||
 581                             hp->h_length < 0)
 582                                 errx(1, "gethostbyname2: illegal address");
 583                         memcpy(&sock_in.sin_addr, hp->h_addr_list[0],
 584                             sizeof(sock_in.sin_addr));
 585                         (void)strncpy(snamebuf, hp->h_name,
 586                             sizeof(snamebuf) - 1);
 587                         snamebuf[sizeof(snamebuf) - 1] = '\0';
 588                         shostname = snamebuf;
 589                 }
 590                 if (bind(ssend, (struct sockaddr *)&sock_in, sizeof sock_in) ==
 591                     -1)
 592                         err(1, "bind");
 593         }
 594
 595         bzero(&whereto, sizeof(whereto));
 596         to = &whereto;
 597         to->sin_family = AF_INET;
 598         to->sin_len = sizeof *to;
 599         if (inet_aton(target, &to->sin_addr) != 0) {
 600                 hostname = target;
 601         } else {
 602                 if (capdns != NULL)
 603                         hp = cap_gethostbyname2(capdns, target, AF_INET);
 604                 else
 605                         hp = gethostbyname2(target, AF_INET);
 606                 if (!hp)
 607                         errx(EX_NOHOST, "cannot resolve %s: %s",
 608                             target, hstrerror(h_errno));
 609
 610                 if ((unsigned)hp->h_length > sizeof(to->sin_addr))
 611                         errx(1, "gethostbyname2 returned an illegal address");
 612                 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
 613                 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
 614                 hnamebuf[sizeof(hnamebuf) - 1] = '\0';
 615                 hostname = hnamebuf;
 616         }
 617
 618         /* From now on we will use only reverse DNS lookups. */
 619         if (capdns != NULL) {
 620                 const char *types[1];
 621
 622                 types[0] = "ADDR2NAME";
 623                 if (cap_dns_type_limit(capdns, types, 1) < 0)
 624                         err(1, "unable to limit access to system.dns service");
 625         }
 626
 627         if (connect(ssend, (struct sockaddr *)&whereto, sizeof(whereto)) != 0)
 628                 err(1, "connect");
 629
 630         if (options & F_FLOOD && options & F_INTERVAL)
 631                 errx(EX_USAGE, "-f and -i: incompatible options");
 632
 633         if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
 634                 errx(EX_USAGE,
 635                     "-f flag cannot be used with multicast destination");
 636         if (options & (F_MIF | F_NOLOOP | F_MTTL)
 637             && !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
 638                 errx(EX_USAGE,
 639                     "-I, -L, -T flags cannot be used with unicast destination");
 640
 641         if (datalen >= TIMEVAL_LEN)     /* can we time transfer */
 642                 timing = 1;
 643
 644         if (!(options & F_PINGFILLED))
 645                 for (i = TIMEVAL_LEN; i < datalen; ++i)
 646                         *datap++ = i;
 647
 648         ident = getpid() & 0xFFFF;
 649
 650         hold = 1;
 651         if (options & F_SO_DEBUG) {
 652                 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 653                     sizeof(hold));
 654                 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 655                     sizeof(hold));
 656         }
 657         if (options & F_SO_DONTROUTE)
 658                 (void)setsockopt(ssend, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
 659                     sizeof(hold));
 660 #ifdef IPSEC
 661 #ifdef IPSEC_POLICY_IPSEC
 662         if (options & F_POLICY) {
 663                 char *buf;
 664                 if (policy_in != NULL) {
 665                         buf = ipsec_set_policy(policy_in, strlen(policy_in));
 666                         if (buf == NULL)
 667                                 errx(EX_CONFIG, "%s", ipsec_strerror());
 668                         if (setsockopt(srecv, IPPROTO_IP, IP_IPSEC_POLICY,
 669                                         buf, ipsec_get_policylen(buf)) < 0)
 670                                 err(EX_CONFIG,
 671                                     "ipsec policy cannot be configured");
 672                         free(buf);
 673                 }
 674
 675                 if (policy_out != NULL) {
 676                         buf = ipsec_set_policy(policy_out, strlen(policy_out));
 677                         if (buf == NULL)
 678                                 errx(EX_CONFIG, "%s", ipsec_strerror());
 679                         if (setsockopt(ssend, IPPROTO_IP, IP_IPSEC_POLICY,
 680                                         buf, ipsec_get_policylen(buf)) < 0)
 681                                 err(EX_CONFIG,
 682                                     "ipsec policy cannot be configured");
 683                         free(buf);
 684                 }
 685         }
 686 #endif /*IPSEC_POLICY_IPSEC*/
 687 #endif /*IPSEC*/
 688
 689         if (options & F_HDRINCL) {
 690                 ip = (struct ip*)outpackhdr;
 691                 if (!(options & (F_TTL | F_MTTL))) {
 692                         mib[0] = CTL_NET;
 693                         mib[1] = PF_INET;
 694                         mib[2] = IPPROTO_IP;
 695                         mib[3] = IPCTL_DEFTTL;
 696                         sz = sizeof(ttl);
 697                         if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1)
 698                                 err(1, "sysctl(net.inet.ip.ttl)");
 699                 }
 700                 setsockopt(ssend, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
 701                 ip->ip_v = IPVERSION;
 702                 ip->ip_hl = sizeof(struct ip) >> 2;
 703                 ip->ip_tos = tos;
 704                 ip->ip_id = 0;
 705                 ip->ip_off = htons(df ? IP_DF : 0);
 706                 ip->ip_ttl = ttl;
 707                 ip->ip_p = IPPROTO_ICMP;
 708                 ip->ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY;
 709                 ip->ip_dst = to->sin_addr;
 710         }
 711
 712         if (options & F_NUMERIC)
 713                 cansandbox = true;
 714         else if (capdns != NULL)
 715                 cansandbox = CASPER_SUPPORT;
 716         else
 717                 cansandbox = false;
 718
 719         /*
 720          * Here we enter capability mode. Further down access to global
 721          * namespaces (e.g filesystem) is restricted (see capsicum(4)).
 722          * We must connect(2) our socket before this point.
 723          */
 724         if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
 725                 err(1, "cap_enter");
 726
 727         cap_rights_init(&rights, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
 728         if (cap_rights_limit(srecv, &rights) < 0 && errno != ENOSYS)
 729                 err(1, "cap_rights_limit srecv");
 730
 731         cap_rights_init(&rights, CAP_SEND, CAP_SETSOCKOPT);
 732         if (cap_rights_limit(ssend, &rights) < 0 && errno != ENOSYS)
 733                 err(1, "cap_rights_limit ssend");
 734
 735         /* record route option */
 736         if (options & F_RROUTE) {
 737 #ifdef IP_OPTIONS
 738                 bzero(rspace, sizeof(rspace));
 739                 rspace[IPOPT_OPTVAL] = IPOPT_RR;
 740                 rspace[IPOPT_OLEN] = sizeof(rspace) - 1;
 741                 rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
 742                 rspace[sizeof(rspace) - 1] = IPOPT_EOL;
 743                 if (setsockopt(ssend, IPPROTO_IP, IP_OPTIONS, rspace,
 744                     sizeof(rspace)) < 0)
 745                         err(EX_OSERR, "setsockopt IP_OPTIONS");
 746 #else
 747                 errx(EX_UNAVAILABLE,
 748                     "record route not available in this implementation");
 749 #endif /* IP_OPTIONS */
 750         }
 751
 752         if (options & F_TTL) {
 753                 if (setsockopt(ssend, IPPROTO_IP, IP_TTL, &ttl,
 754                     sizeof(ttl)) < 0) {
 755                         err(EX_OSERR, "setsockopt IP_TTL");
 756                 }
 757         }
 758         if (options & F_NOLOOP) {
 759                 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
 760                     sizeof(loop)) < 0) {
 761                         err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
 762                 }
 763         }
 764         if (options & F_MTTL) {
 765                 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_TTL, &mttl,
 766                     sizeof(mttl)) < 0) {
 767                         err(EX_OSERR, "setsockopt IP_MULTICAST_TTL");
 768                 }
 769         }
 770         if (options & F_MIF) {
 771                 if (setsockopt(ssend, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
 772                     sizeof(ifaddr)) < 0) {
 773                         err(EX_OSERR, "setsockopt IP_MULTICAST_IF");
 774                 }
 775         }
 776 #ifdef SO_TIMESTAMP
 777         { int on = 1;
 778         if (setsockopt(srecv, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0)
 779                 err(EX_OSERR, "setsockopt SO_TIMESTAMP");
 780         }
 781 #endif
 782         if (sweepmax) {
 783                 if (sweepmin > sweepmax)
 784                         errx(EX_USAGE, "Maximum packet size must be no less than the minimum packet size");
 785
 786                 if (datalen != DEFDATALEN)
 787                         errx(EX_USAGE, "Packet size and ping sweep are mutually exclusive");
 788
 789                 if (npackets > 0) {
 790                         snpackets = npackets;
 791                         npackets = 0;
 792                 } else
 793                         snpackets = 1;
 794                 datalen = sweepmin;
 795                 send_len = icmp_len + sweepmin;
 796         }
 797         if (options & F_SWEEP && !sweepmax)
 798                 errx(EX_USAGE, "Maximum sweep size must be specified");
 799
 800         /*
 801          * When pinging the broadcast address, you can get a lot of answers.
 802          * Doing something so evil is useful if you are trying to stress the
 803          * ethernet, or just want to fill the arp cache to get some stuff for
 804          * /etc/ethers.  But beware: RFC 1122 allows hosts to ignore broadcast
 805          * or multicast pings if they wish.
 806          */
 807
 808         /*
 809          * XXX receive buffer needs undetermined space for mbuf overhead
 810          * as well.
 811          */
 812         hold = IP_MAXPACKET + 128;
 813         (void)setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
 814             sizeof(hold));
 815         /* CAP_SETSOCKOPT removed */
 816         cap_rights_init(&rights, CAP_RECV, CAP_EVENT);
 817         if (cap_rights_limit(srecv, &rights) < 0 && errno != ENOSYS)
 818                 err(1, "cap_rights_limit srecv setsockopt");
 819         if (uid == 0)
 820                 (void)setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
 821                     sizeof(hold));
 822         /* CAP_SETSOCKOPT removed */
 823         cap_rights_init(&rights, CAP_SEND);
 824         if (cap_rights_limit(ssend, &rights) < 0 && errno != ENOSYS)
 825                 err(1, "cap_rights_limit ssend setsockopt");
 826
 827         if (to->sin_family == AF_INET) {
 828                 (void)printf("PING %s (%s)", hostname,
 829                     inet_ntoa(to->sin_addr));
 830                 if (source)
 831                         (void)printf(" from %s", shostname);
 832                 if (sweepmax)
 833                         (void)printf(": (%d ... %d) data bytes\n",
 834                             sweepmin, sweepmax);
 835                 else
 836                         (void)printf(": %d data bytes\n", datalen);
 837
 838         } else {
 839                 if (sweepmax)
 840                         (void)printf("PING %s: (%d ... %d) data bytes\n",
 841                             hostname, sweepmin, sweepmax);
 842                 else
 843                         (void)printf("PING %s: %d data bytes\n", hostname, datalen);
 844         }
 845
 846         /*
 847          * Use sigaction() instead of signal() to get unambiguous semantics,
 848          * in particular with SA_RESTART not set.
 849          */
 850
 851         sigemptyset(&si_sa.sa_mask);
 852         si_sa.sa_flags = 0;
 853
 854         si_sa.sa_handler = stopit;
 855         if (sigaction(SIGINT, &si_sa, 0) == -1) {
 856                 err(EX_OSERR, "sigaction SIGINT");
 857         }
 858
 859         si_sa.sa_handler = status;
 860         if (sigaction(SIGINFO, &si_sa, 0) == -1) {
 861                 err(EX_OSERR, "sigaction");
 862         }
 863
 864         if (alarmtimeout > 0) {
 865                 si_sa.sa_handler = stopit;
 866                 if (sigaction(SIGALRM, &si_sa, 0) == -1)
 867                         err(EX_OSERR, "sigaction SIGALRM");
 868         }
 869
 870         bzero(&msg, sizeof(msg));
 871         msg.msg_name = (caddr_t)&from;
 872         msg.msg_iov = &iov;
 873         msg.msg_iovlen = 1;
 874 #ifdef SO_TIMESTAMP
 875         msg.msg_control = (caddr_t)ctrl;
 876 #endif
 877         iov.iov_base = packet;
 878         iov.iov_len = IP_MAXPACKET;
 879
 880         if (preload == 0)
 881                 pinger();               /* send the first ping */
 882         else {
 883                 if (npackets != 0 && preload > npackets)
 884                         preload = npackets;
 885                 while (preload--)       /* fire off them quickies */
 886                         pinger();
 887         }
 888         (void)gettimeofday(&last, NULL);
 889
 890         if (options & F_FLOOD) {
 891                 intvl.tv_sec = 0;
 892                 intvl.tv_usec = 10000;
 893         } else {
 894                 intvl.tv_sec = interval / 1000;
 895                 intvl.tv_usec = interval % 1000 * 1000;
 896         }
 897
 898         almost_done = 0;
 899         while (!finish_up) {
 900                 struct timeval now, timeout;
 901                 fd_set rfds;
 902                 int cc, n;
 903
 904                 check_status();
 905                 if ((unsigned)srecv >= FD_SETSIZE)
 906                         errx(EX_OSERR, "descriptor too large");
 907                 FD_ZERO(&rfds);
 908                 FD_SET(srecv, &rfds);
 909                 (void)gettimeofday(&now, NULL);
 910                 timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec;
 911                 timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec;
 912                 while (timeout.tv_usec < 0) {
 913                         timeout.tv_usec += 1000000;
 914                         timeout.tv_sec--;
 915                 }
 916                 while (timeout.tv_usec >= 1000000) {
 917                         timeout.tv_usec -= 1000000;
 918                         timeout.tv_sec++;
 919                 }
 920                 if (timeout.tv_sec < 0)
 921                         timerclear(&timeout);
 922                 n = select(srecv + 1, &rfds, NULL, NULL, &timeout);
 923                 if (n < 0)
 924                         continue;       /* Must be EINTR. */
 925                 if (n == 1) {
 926                         struct timeval *tv = NULL;
 927 #ifdef SO_TIMESTAMP
 928                         struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl;
 929
 930                         msg.msg_controllen = sizeof(ctrl);
 931 #endif
 932                         msg.msg_namelen = sizeof(from);
 933                         if ((cc = recvmsg(srecv, &msg, 0)) < 0) {
 934                                 if (errno == EINTR)
 935                                         continue;
 936                                 warn("recvmsg");
 937                                 continue;
 938                         }
 939 #ifdef SO_TIMESTAMP
 940                         if (cmsg->cmsg_level == SOL_SOCKET &&
 941                             cmsg->cmsg_type == SCM_TIMESTAMP &&
 942                             cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
 943                                 /* Copy to avoid alignment problems: */
 944                                 memcpy(&now, CMSG_DATA(cmsg), sizeof(now));
 945                                 tv = &now;
 946                         }
 947 #endif
 948                         if (tv == NULL) {
 949                                 (void)gettimeofday(&now, NULL);
 950                                 tv = &now;
 951                         }
 952                         pr_pack((char *)packet, cc, &from, tv);
 953                         if ((options & F_ONCE && nreceived) ||
 954                             (npackets && nreceived >= npackets))
 955                                 break;
 956                 }
 957                 if (n == 0 || options & F_FLOOD) {
 958                         if (sweepmax && sntransmitted == snpackets) {
 959                                 for (i = 0; i < sweepincr ; ++i)
 960                                         *datap++ = i;
 961                                 datalen += sweepincr;
 962                                 if (datalen > sweepmax)
 963                                         break;
 964                                 send_len = icmp_len + datalen;
 965                                 sntransmitted = 0;
 966                         }
 967                         if (!npackets || ntransmitted < npackets)
 968                                 pinger();
 969                         else {
 970                                 if (almost_done)
 971                                         break;
 972                                 almost_done = 1;
 973                                 intvl.tv_usec = 0;
 974                                 if (nreceived) {
 975                                         intvl.tv_sec = 2 * tmax / 1000;
 976                                         if (!intvl.tv_sec)
 977                                                 intvl.tv_sec = 1;
 978                                 } else {
 979                                         intvl.tv_sec = waittime / 1000;
 980                                         intvl.tv_usec = waittime % 1000 * 1000;
 981                                 }
 982                         }
 983                         (void)gettimeofday(&last, NULL);
 984                         if (ntransmitted - nreceived - 1 > nmissedmax) {
 985                                 nmissedmax = ntransmitted - nreceived - 1;
 986                                 if (options & F_MISSED)
 987                                         (void)write(STDOUT_FILENO, &BBELL, 1);
 988                         }
 989                 }
 990         }
 991         finish();
 992         /* NOTREACHED */
 993         exit(0);        /* Make the compiler happy */
 994 }
 995
 996 /*
 997  * stopit --
 998  *      Set the global bit that causes the main loop to quit.
 999  * Do NOT call finish() from here, since finish() does far too much
1000  * to be called from a signal handler.
1001  */
1002 void
1003 stopit(int sig __unused)
1004 {
1005
1006         /*
1007          * When doing reverse DNS lookups, the finish_up flag might not
1008          * be noticed for a while.  Just exit if we get a second SIGINT.
1009          */
1010         if (!(options & F_NUMERIC) && finish_up)
1011                 _exit(nreceived ? 0 : 2);
1012         finish_up = 1;
1013 }
1014
1015 /*
1016  * pinger --
1017  *      Compose and transmit an ICMP ECHO REQUEST packet.  The IP packet
1018  * will be added on by the kernel.  The ID field is our UNIX process ID,
1019  * and the sequence number is an ascending integer.  The first TIMEVAL_LEN
1020  * bytes of the data portion are used to hold a UNIX "timeval" struct in
1021  * host byte-order, to compute the round-trip time.
1022  */
1023 static void
1024 pinger(void)
1025 {
1026         struct timeval now;
1027         struct tv32 tv32;
1028         struct ip *ip;
1029         struct icmp *icp;
1030         int cc, i;
1031         u_char *packet;
1032
1033         packet = outpack;
1034         icp = (struct icmp *)outpack;
1035         icp->icmp_type = icmp_type;
1036         icp->icmp_code = 0;
1037         icp->icmp_cksum = 0;
1038         icp->icmp_seq = htons(ntransmitted);
1039         icp->icmp_id = ident;                   /* ID */
1040
1041         CLR(ntransmitted % mx_dup_ck);
1042
1043         if ((options & F_TIME) || timing) {
1044                 (void)gettimeofday(&now, NULL);
1045
1046                 tv32.tv32_sec = htonl(now.tv_sec);
1047                 tv32.tv32_usec = htonl(now.tv_usec);
1048                 if (options & F_TIME)
1049                         icp->icmp_otime = htonl((now.tv_sec % (24*60*60))
1050                                 * 1000 + now.tv_usec / 1000);
1051                 if (timing)
1052                         bcopy((void *)&tv32,
1053                             (void *)&outpack[ICMP_MINLEN + phdr_len],
1054                             sizeof(tv32));
1055         }
1056
1057         cc = ICMP_MINLEN + phdr_len + datalen;
1058
1059         /* compute ICMP checksum here */
1060         icp->icmp_cksum = in_cksum((u_short *)icp, cc);
1061
1062         if (options & F_HDRINCL) {
1063                 cc += sizeof(struct ip);
1064                 ip = (struct ip *)outpackhdr;
1065                 ip->ip_len = htons(cc);
1066                 ip->ip_sum = in_cksum((u_short *)outpackhdr, cc);
1067                 packet = outpackhdr;
1068         }
1069         i = send(ssend, (char *)packet, cc, 0);
1070         if (i < 0 || i != cc)  {
1071                 if (i < 0) {
1072                         if (options & F_FLOOD && errno == ENOBUFS) {
1073                                 usleep(FLOOD_BACKOFF);
1074                                 return;
1075                         }
1076                         warn("sendto");
1077                 } else {
1078                         warn("%s: partial write: %d of %d bytes",
1079                              hostname, i, cc);
1080                 }
1081         }
1082         ntransmitted++;
1083         sntransmitted++;
1084         if (!(options & F_QUIET) && options & F_FLOOD)
1085                 (void)write(STDOUT_FILENO, &DOT, 1);
1086 }
1087
1088 /*
1089  * pr_pack --
1090  *      Print out the packet, if it came from us.  This logic is necessary
1091  * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
1092  * which arrive ('tis only fair).  This permits multiple copies of this
1093  * program to be run without having intermingled output (or statistics!).
1094  */
1095 static void
1096 pr_pack(char *buf, int cc, struct sockaddr_in *from, struct timeval *tv)
1097 {
1098         struct in_addr ina;
1099         u_char *cp, *dp;
1100         struct icmp *icp;
1101         struct ip *ip;
1102         const void *tp;
1103         double triptime;
1104         int dupflag, hlen, i, j, recv_len, seq;
1105         static int old_rrlen;
1106         static char old_rr[MAX_IPOPTLEN];
1107
1108         /* Check the IP header */
1109         ip = (struct ip *)buf;
1110         hlen = ip->ip_hl << 2;
1111         recv_len = cc;
1112         if (cc < hlen + ICMP_MINLEN) {
1113                 if (options & F_VERBOSE)
1114                         warn("packet too short (%d bytes) from %s", cc,
1115                              inet_ntoa(from->sin_addr));
1116                 return;
1117         }
1118
1119         /* Now the ICMP part */
1120         cc -= hlen;
1121         icp = (struct icmp *)(buf + hlen);
1122         if (icp->icmp_type == icmp_type_rsp) {
1123                 if (icp->icmp_id != ident)
1124                         return;                 /* 'Twas not our ECHO */
1125                 ++nreceived;
1126                 triptime = 0.0;
1127                 if (timing) {
1128                         struct timeval tv1;
1129                         struct tv32 tv32;
1130 #ifndef icmp_data
1131                         tp = &icp->icmp_ip;
1132 #else
1133                         tp = icp->icmp_data;
1134 #endif
1135                         tp = (const char *)tp + phdr_len;
1136
1137                         if ((size_t)(cc - ICMP_MINLEN - phdr_len) >=
1138                             sizeof(tv1)) {
1139                                 /* Copy to avoid alignment problems: */
1140                                 memcpy(&tv32, tp, sizeof(tv32));
1141                                 tv1.tv_sec = ntohl(tv32.tv32_sec);
1142                                 tv1.tv_usec = ntohl(tv32.tv32_usec);
1143                                 tvsub(tv, &tv1);
1144                                 triptime = ((double)tv->tv_sec) * 1000.0 +
1145                                     ((double)tv->tv_usec) / 1000.0;
1146                                 tsum += triptime;
1147                                 tsumsq += triptime * triptime;
1148                                 if (triptime < tmin)
1149                                         tmin = triptime;
1150                                 if (triptime > tmax)
1151                                         tmax = triptime;
1152                         } else
1153                                 timing = 0;
1154                 }
1155
1156                 seq = ntohs(icp->icmp_seq);
1157
1158                 if (TST(seq % mx_dup_ck)) {
1159                         ++nrepeats;
1160                         --nreceived;
1161                         dupflag = 1;
1162                 } else {
1163                         SET(seq % mx_dup_ck);
1164                         dupflag = 0;
1165                 }
1166
1167                 if (options & F_QUIET)
1168                         return;
1169
1170                 if (options & F_WAITTIME && triptime > waittime) {
1171                         ++nrcvtimeout;
1172                         return;
1173                 }
1174
1175                 if (options & F_FLOOD)
1176                         (void)write(STDOUT_FILENO, &BSPACE, 1);
1177                 else {
1178                         (void)printf("%d bytes from %s: icmp_seq=%u", cc,
1179                            inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
1180                            seq);
1181                         (void)printf(" ttl=%d", ip->ip_ttl);
1182                         if (timing)
1183                                 (void)printf(" time=%.3f ms", triptime);
1184                         if (dupflag)
1185                                 (void)printf(" (DUP!)");
1186                         if (options & F_AUDIBLE)
1187                                 (void)write(STDOUT_FILENO, &BBELL, 1);
1188                         if (options & F_MASK) {
1189                                 /* Just prentend this cast isn't ugly */
1190                                 (void)printf(" mask=%s",
1191                                         inet_ntoa(*(struct in_addr *)&(icp->icmp_mask)));
1192                         }
1193                         if (options & F_TIME) {
1194                                 (void)printf(" tso=%s", pr_ntime(icp->icmp_otime));
1195                                 (void)printf(" tsr=%s", pr_ntime(icp->icmp_rtime));
1196                                 (void)printf(" tst=%s", pr_ntime(icp->icmp_ttime));
1197                         }
1198                         if (recv_len != send_len) {
1199                                 (void)printf(
1200                                      "\nwrong total length %d instead of %d",
1201                                      recv_len, send_len);
1202                         }
1203                         /* check the data */
1204                         cp = (u_char*)&icp->icmp_data[phdr_len];
1205                         dp = &outpack[ICMP_MINLEN + phdr_len];
1206                         cc -= ICMP_MINLEN + phdr_len;
1207                         i = 0;
1208                         if (timing) {   /* don't check variable timestamp */
1209                                 cp += TIMEVAL_LEN;
1210                                 dp += TIMEVAL_LEN;
1211                                 cc -= TIMEVAL_LEN;
1212                                 i += TIMEVAL_LEN;
1213                         }
1214                         for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) {
1215                                 if (*cp != *dp) {
1216         (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
1217             i, *dp, *cp);
1218                                         (void)printf("\ncp:");
1219                                         cp = (u_char*)&icp->icmp_data[0];
1220                                         for (i = 0; i < datalen; ++i, ++cp) {
1221                                                 if ((i % 16) == 8)
1222                                                         (void)printf("\n\t");
1223                                                 (void)printf("%2x ", *cp);
1224                                         }
1225                                         (void)printf("\ndp:");
1226                                         cp = &outpack[ICMP_MINLEN];
1227                                         for (i = 0; i < datalen; ++i, ++cp) {
1228                                                 if ((i % 16) == 8)
1229                                                         (void)printf("\n\t");
1230                                                 (void)printf("%2x ", *cp);
1231                                         }
1232                                         break;
1233                                 }
1234                         }
1235                 }
1236         } else {
1237                 /*
1238                  * We've got something other than an ECHOREPLY.
1239                  * See if it's a reply to something that we sent.
1240                  * We can compare IP destination, protocol,
1241                  * and ICMP type and ID.
1242                  *
1243                  * Only print all the error messages if we are running
1244                  * as root to avoid leaking information not normally
1245                  * available to those not running as root.
1246                  */
1247 #ifndef icmp_data
1248                 struct ip *oip = &icp->icmp_ip;
1249 #else
1250                 struct ip *oip = (struct ip *)icp->icmp_data;
1251 #endif
1252                 struct icmp *oicmp = (struct icmp *)(oip + 1);
1253
1254                 if (((options & F_VERBOSE) && uid == 0) ||
1255                     (!(options & F_QUIET2) &&
1256                      (oip->ip_dst.s_addr == whereto.sin_addr.s_addr) &&
1257                      (oip->ip_p == IPPROTO_ICMP) &&
1258                      (oicmp->icmp_type == ICMP_ECHO) &&
1259                      (oicmp->icmp_id == ident))) {
1260                     (void)printf("%d bytes from %s: ", cc,
1261                         pr_addr(from->sin_addr));
1262                     pr_icmph(icp);
1263                 } else
1264                     return;
1265         }
1266
1267         /* Display any IP options */
1268         cp = (u_char *)buf + sizeof(struct ip);
1269
1270         for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
1271                 switch (*cp) {
1272                 case IPOPT_EOL:
1273                         hlen = 0;
1274                         break;
1275                 case IPOPT_LSRR:
1276                 case IPOPT_SSRR:
1277                         (void)printf(*cp == IPOPT_LSRR ?
1278                             "\nLSRR: " : "\nSSRR: ");
1279                         j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1;
1280                         hlen -= 2;
1281                         cp += 2;
1282                         if (j >= INADDR_LEN &&
1283                             j <= hlen - (int)sizeof(struct ip)) {
1284                                 for (;;) {
1285                                         bcopy(++cp, &ina.s_addr, INADDR_LEN);
1286                                         if (ina.s_addr == 0)
1287                                                 (void)printf("\t0.0.0.0");
1288                                         else
1289                                                 (void)printf("\t%s",
1290                                                      pr_addr(ina));
1291                                         hlen -= INADDR_LEN;
1292                                         cp += INADDR_LEN - 1;
1293                                         j -= INADDR_LEN;
1294                                         if (j < INADDR_LEN)
1295                                                 break;
1296                                         (void)putchar('\n');
1297                                 }
1298                         } else
1299                                 (void)printf("\t(truncated route)\n");
1300                         break;
1301                 case IPOPT_RR:
1302                         j = cp[IPOPT_OLEN];             /* get length */
1303                         i = cp[IPOPT_OFFSET];           /* and pointer */
1304                         hlen -= 2;
1305                         cp += 2;
1306                         if (i > j)
1307                                 i = j;
1308                         i = i - IPOPT_MINOFF + 1;
1309                         if (i < 0 || i > (hlen - (int)sizeof(struct ip))) {
1310                                 old_rrlen = 0;
1311                                 continue;
1312                         }
1313                         if (i == old_rrlen
1314                             && !bcmp((char *)cp, old_rr, i)
1315                             && !(options & F_FLOOD)) {
1316                                 (void)printf("\t(same route)");
1317                                 hlen -= i;
1318                                 cp += i;
1319                                 break;
1320                         }
1321                         old_rrlen = i;
1322                         bcopy((char *)cp, old_rr, i);
1323                         (void)printf("\nRR: ");
1324                         if (i >= INADDR_LEN &&
1325                             i <= hlen - (int)sizeof(struct ip)) {
1326                                 for (;;) {
1327                                         bcopy(++cp, &ina.s_addr, INADDR_LEN);
1328                                         if (ina.s_addr == 0)
1329                                                 (void)printf("\t0.0.0.0");
1330                                         else
1331                                                 (void)printf("\t%s",
1332                                                      pr_addr(ina));
1333                                         hlen -= INADDR_LEN;
1334                                         cp += INADDR_LEN - 1;
1335                                         i -= INADDR_LEN;
1336                                         if (i < INADDR_LEN)
1337                                                 break;
1338                                         (void)putchar('\n');
1339                                 }
1340                         } else
1341                                 (void)printf("\t(truncated route)");
1342                         break;
1343                 case IPOPT_NOP:
1344                         (void)printf("\nNOP");
1345                         break;
1346                 default:
1347                         (void)printf("\nunknown option %x", *cp);
1348                         break;
1349                 }
1350         if (!(options & F_FLOOD)) {
1351                 (void)putchar('\n');
1352                 (void)fflush(stdout);
1353         }
1354 }
1355
1356 /*
1357  * in_cksum --
1358  *      Checksum routine for Internet Protocol family headers (C Version)
1359  */
1360 u_short
1361 in_cksum(u_short *addr, int len)
1362 {
1363         int nleft, sum;
1364         u_short *w;
1365         union {
1366                 u_short us;
1367                 u_char  uc[2];
1368         } last;
1369         u_short answer;
1370
1371         nleft = len;
1372         sum = 0;
1373         w = addr;
1374
1375         /*
1376          * Our algorithm is simple, using a 32 bit accumulator (sum), we add
1377          * sequential 16 bit words to it, and at the end, fold back all the
1378          * carry bits from the top 16 bits into the lower 16 bits.
1379          */
1380         while (nleft > 1)  {
1381                 sum += *w++;
1382                 nleft -= 2;
1383         }
1384
1385         /* mop up an odd byte, if necessary */
1386         if (nleft == 1) {
1387                 last.uc[0] = *(u_char *)w;
1388                 last.uc[1] = 0;
1389                 sum += last.us;
1390         }
1391
1392         /* add back carry outs from top 16 bits to low 16 bits */
1393         sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
1394         sum += (sum >> 16);                     /* add carry */
1395         answer = ~sum;                          /* truncate to 16 bits */
1396         return(answer);
1397 }
1398
1399 /*
1400  * tvsub --
1401  *      Subtract 2 timeval structs:  out = out - in.  Out is assumed to
1402  * be >= in.
1403  */
1404 static void
1405 tvsub(struct timeval *out, const struct timeval *in)
1406 {
1407
1408         if ((out->tv_usec -= in->tv_usec) < 0) {
1409                 --out->tv_sec;
1410                 out->tv_usec += 1000000;
1411         }
1412         out->tv_sec -= in->tv_sec;
1413 }
1414
1415 /*
1416  * status --
1417  *      Print out statistics when SIGINFO is received.
1418  */
1419
1420 static void
1421 status(int sig __unused)
1422 {
1423
1424         siginfo_p = 1;
1425 }
1426
1427 static void
1428 check_status(void)
1429 {
1430
1431         if (siginfo_p) {
1432                 siginfo_p = 0;
1433                 (void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)",
1434                     nreceived, ntransmitted,
1435                     ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0);
1436                 if (nreceived && timing)
1437                         (void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max",
1438                             tmin, tsum / (nreceived + nrepeats), tmax);
1439                 (void)fprintf(stderr, "\n");
1440         }
1441 }
1442
1443 /*
1444  * finish --
1445  *      Print out statistics, and give up.
1446  */
1447 static void
1448 finish(void)
1449 {
1450
1451         (void)signal(SIGINT, SIG_IGN);
1452         (void)signal(SIGALRM, SIG_IGN);
1453         (void)putchar('\n');
1454         (void)fflush(stdout);
1455         (void)printf("--- %s ping statistics ---\n", hostname);
1456         (void)printf("%ld packets transmitted, ", ntransmitted);
1457         (void)printf("%ld packets received, ", nreceived);
1458         if (nrepeats)
1459                 (void)printf("+%ld duplicates, ", nrepeats);
1460         if (ntransmitted) {
1461                 if (nreceived > ntransmitted)
1462                         (void)printf("-- somebody's printing up packets!");
1463                 else
1464                         (void)printf("%.1f%% packet loss",
1465                             ((ntransmitted - nreceived) * 100.0) /
1466                             ntransmitted);
1467         }
1468         if (nrcvtimeout)
1469                 (void)printf(", %ld packets out of wait time", nrcvtimeout);
1470         (void)putchar('\n');
1471         if (nreceived && timing) {
1472                 double n = nreceived + nrepeats;
1473                 double avg = tsum / n;
1474                 double vari = tsumsq / n - avg * avg;
1475                 (void)printf(
1476                     "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n",
1477                     tmin, avg, tmax, sqrt(vari));
1478         }
1479
1480         if (nreceived)
1481                 exit(0);
1482         else
1483                 exit(2);
1484 }
1485
1486 #ifdef notdef
1487 static char *ttab[] = {
1488         "Echo Reply",           /* ip + seq + udata */
1489         "Dest Unreachable",     /* net, host, proto, port, frag, sr + IP */
1490         "Source Quench",        /* IP */
1491         "Redirect",             /* redirect type, gateway, + IP  */
1492         "Echo",
1493         "Time Exceeded",        /* transit, frag reassem + IP */
1494         "Parameter Problem",    /* pointer + IP */
1495         "Timestamp",            /* id + seq + three timestamps */
1496         "Timestamp Reply",      /* " */
1497         "Info Request",         /* id + sq */
1498         "Info Reply"            /* " */
1499 };
1500 #endif
1501
1502 /*
1503  * pr_icmph --
1504  *      Print a descriptive string about an ICMP header.
1505  */
1506 static void
1507 pr_icmph(struct icmp *icp)
1508 {
1509
1510         switch(icp->icmp_type) {
1511         case ICMP_ECHOREPLY:
1512                 (void)printf("Echo Reply\n");
1513                 /* XXX ID + Seq + Data */
1514                 break;
1515         case ICMP_UNREACH:
1516                 switch(icp->icmp_code) {
1517                 case ICMP_UNREACH_NET:
1518                         (void)printf("Destination Net Unreachable\n");
1519                         break;
1520                 case ICMP_UNREACH_HOST:
1521                         (void)printf("Destination Host Unreachable\n");
1522                         break;
1523                 case ICMP_UNREACH_PROTOCOL:
1524                         (void)printf("Destination Protocol Unreachable\n");
1525                         break;
1526                 case ICMP_UNREACH_PORT:
1527                         (void)printf("Destination Port Unreachable\n");
1528                         break;
1529                 case ICMP_UNREACH_NEEDFRAG:
1530                         (void)printf("frag needed and DF set (MTU %d)\n",
1531                                         ntohs(icp->icmp_nextmtu));
1532                         break;
1533                 case ICMP_UNREACH_SRCFAIL:
1534                         (void)printf("Source Route Failed\n");
1535                         break;
1536                 case ICMP_UNREACH_FILTER_PROHIB:
1537                         (void)printf("Communication prohibited by filter\n");
1538                         break;
1539                 default:
1540                         (void)printf("Dest Unreachable, Bad Code: %d\n",
1541                             icp->icmp_code);
1542                         break;
1543                 }
1544                 /* Print returned IP header information */
1545 #ifndef icmp_data
1546                 pr_retip(&icp->icmp_ip);
1547 #else
1548                 pr_retip((struct ip *)icp->icmp_data);
1549 #endif
1550                 break;
1551         case ICMP_SOURCEQUENCH:
1552                 (void)printf("Source Quench\n");
1553 #ifndef icmp_data
1554                 pr_retip(&icp->icmp_ip);
1555 #else
1556                 pr_retip((struct ip *)icp->icmp_data);
1557 #endif
1558                 break;
1559         case ICMP_REDIRECT:
1560                 switch(icp->icmp_code) {
1561                 case ICMP_REDIRECT_NET:
1562                         (void)printf("Redirect Network");
1563                         break;
1564                 case ICMP_REDIRECT_HOST:
1565                         (void)printf("Redirect Host");
1566                         break;
1567                 case ICMP_REDIRECT_TOSNET:
1568                         (void)printf("Redirect Type of Service and Network");
1569                         break;
1570                 case ICMP_REDIRECT_TOSHOST:
1571                         (void)printf("Redirect Type of Service and Host");
1572                         break;
1573                 default:
1574                         (void)printf("Redirect, Bad Code: %d", icp->icmp_code);
1575                         break;
1576                 }
1577                 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
1578 #ifndef icmp_data
1579                 pr_retip(&icp->icmp_ip);
1580 #else
1581                 pr_retip((struct ip *)icp->icmp_data);
1582 #endif
1583                 break;
1584         case ICMP_ECHO:
1585                 (void)printf("Echo Request\n");
1586                 /* XXX ID + Seq + Data */
1587                 break;
1588         case ICMP_TIMXCEED:
1589                 switch(icp->icmp_code) {
1590                 case ICMP_TIMXCEED_INTRANS:
1591                         (void)printf("Time to live exceeded\n");
1592                         break;
1593                 case ICMP_TIMXCEED_REASS:
1594                         (void)printf("Frag reassembly time exceeded\n");
1595                         break;
1596                 default:
1597                         (void)printf("Time exceeded, Bad Code: %d\n",
1598                             icp->icmp_code);
1599                         break;
1600                 }
1601 #ifndef icmp_data
1602                 pr_retip(&icp->icmp_ip);
1603 #else
1604                 pr_retip((struct ip *)icp->icmp_data);
1605 #endif
1606                 break;
1607         case ICMP_PARAMPROB:
1608                 (void)printf("Parameter problem: pointer = 0x%02x\n",
1609                     icp->icmp_hun.ih_pptr);
1610 #ifndef icmp_data
1611                 pr_retip(&icp->icmp_ip);
1612 #else
1613                 pr_retip((struct ip *)icp->icmp_data);
1614 #endif
1615                 break;
1616         case ICMP_TSTAMP:
1617                 (void)printf("Timestamp\n");
1618                 /* XXX ID + Seq + 3 timestamps */
1619                 break;
1620         case ICMP_TSTAMPREPLY:
1621                 (void)printf("Timestamp Reply\n");
1622                 /* XXX ID + Seq + 3 timestamps */
1623                 break;
1624         case ICMP_IREQ:
1625                 (void)printf("Information Request\n");
1626                 /* XXX ID + Seq */
1627                 break;
1628         case ICMP_IREQREPLY:
1629                 (void)printf("Information Reply\n");
1630                 /* XXX ID + Seq */
1631                 break;
1632         case ICMP_MASKREQ:
1633                 (void)printf("Address Mask Request\n");
1634                 break;
1635         case ICMP_MASKREPLY:
1636                 (void)printf("Address Mask Reply\n");
1637                 break;
1638         case ICMP_ROUTERADVERT:
1639                 (void)printf("Router Advertisement\n");
1640                 break;
1641         case ICMP_ROUTERSOLICIT:
1642                 (void)printf("Router Solicitation\n");
1643                 break;
1644         default:
1645                 (void)printf("Bad ICMP type: %d\n", icp->icmp_type);
1646         }
1647 }
1648
1649 /*
1650  * pr_iph --
1651  *      Print an IP header with options.
1652  */
1653 static void
1654 pr_iph(struct ip *ip)
1655 {
1656         struct in_addr ina;
1657         u_char *cp;
1658         int hlen;
1659
1660         hlen = ip->ip_hl << 2;
1661         cp = (u_char *)ip + 20;         /* point to options */
1662
1663         (void)printf("Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst\n");
1664         (void)printf(" %1x  %1x  %02x %04x %04x",
1665             ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
1666             ntohs(ip->ip_id));
1667         (void)printf("   %1lx %04lx",
1668             (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13,
1669             (u_long) ntohl(ip->ip_off) & 0x1fff);
1670         (void)printf("  %02x  %02x %04x", ip->ip_ttl, ip->ip_p,
1671                                                             ntohs(ip->ip_sum));
1672         memcpy(&ina, &ip->ip_src.s_addr, sizeof ina);
1673         (void)printf(" %s ", inet_ntoa(ina));
1674         memcpy(&ina, &ip->ip_dst.s_addr, sizeof ina);
1675         (void)printf(" %s ", inet_ntoa(ina));
1676         /* dump any option bytes */
1677         while (hlen-- > 20) {
1678                 (void)printf("%02x", *cp++);
1679         }
1680         (void)putchar('\n');
1681 }
1682
1683 /*
1684  * pr_addr --
1685  *      Return an ascii host address as a dotted quad and optionally with
1686  * a hostname.
1687  */
1688 static char *
1689 pr_addr(struct in_addr ina)
1690 {
1691         struct hostent *hp;
1692         static char buf[16 + 3 + MAXHOSTNAMELEN];
1693
1694         if (options & F_NUMERIC)
1695                 return inet_ntoa(ina);
1696
1697         if (capdns != NULL)
1698                 hp = cap_gethostbyaddr(capdns, (char *)&ina, 4, AF_INET);
1699         else
1700                 hp = gethostbyaddr((char *)&ina, 4, AF_INET);
1701
1702         if (hp == NULL)
1703                 return inet_ntoa(ina);
1704
1705         (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
1706             inet_ntoa(ina));
1707         return(buf);
1708 }
1709
1710 /*
1711  * pr_retip --
1712  *      Dump some info on a returned (via ICMP) IP packet.
1713  */
1714 static void
1715 pr_retip(struct ip *ip)
1716 {
1717         u_char *cp;
1718         int hlen;
1719
1720         pr_iph(ip);
1721         hlen = ip->ip_hl << 2;
1722         cp = (u_char *)ip + hlen;
1723
1724         if (ip->ip_p == 6)
1725                 (void)printf("TCP: from port %u, to port %u (decimal)\n",
1726                     (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
1727         else if (ip->ip_p == 17)
1728                 (void)printf("UDP: from port %u, to port %u (decimal)\n",
1729                         (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
1730 }
1731
1732 static char *
1733 pr_ntime(n_time timestamp)
1734 {
1735         static char buf[10];
1736         int hour, min, sec;
1737
1738         sec = ntohl(timestamp) / 1000;
1739         hour = sec / 60 / 60;
1740         min = (sec % (60 * 60)) / 60;
1741         sec = (sec % (60 * 60)) % 60;
1742
1743         (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec);
1744
1745         return (buf);
1746 }
1747
1748 static void
1749 fill(char *bp, char *patp)
1750 {
1751         char *cp;
1752         int pat[16];
1753         u_int ii, jj, kk;
1754
1755         for (cp = patp; *cp; cp++) {
1756                 if (!isxdigit(*cp))
1757                         errx(EX_USAGE,
1758                             "patterns must be specified as hex digits");
1759
1760         }
1761         ii = sscanf(patp,
1762             "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
1763             &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
1764             &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
1765             &pat[13], &pat[14], &pat[15]);
1766
1767         if (ii > 0)
1768                 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii)
1769                         for (jj = 0; jj < ii; ++jj)
1770                                 bp[jj + kk] = pat[jj];
1771         if (!(options & F_QUIET)) {
1772                 (void)printf("PATTERN: 0x");
1773                 for (jj = 0; jj < ii; ++jj)
1774                         (void)printf("%02x", bp[jj] & 0xFF);
1775                 (void)printf("\n");
1776         }
1777 }
1778
1779 static cap_channel_t *
1780 capdns_setup(void)
1781 {
1782         cap_channel_t *capcas, *capdnsloc;
1783         const char *types[2];
1784         int families[1];
1785
1786         capcas = cap_init();
1787         if (capcas == NULL)
1788                 err(1, "unable to create casper process");
1789         capdnsloc = cap_service_open(capcas, "system.dns");
1790         /* Casper capability no longer needed. */
1791         cap_close(capcas);
1792         if (capdnsloc == NULL)
1793                 err(1, "unable to open system.dns service");
1794         types[0] = "NAME2ADDR";
1795         types[1] = "ADDR2NAME";
1796         if (cap_dns_type_limit(capdnsloc, types, 2) < 0)
1797                 err(1, "unable to limit access to system.dns service");
1798         families[0] = AF_INET;
1799         if (cap_dns_family_limit(capdnsloc, families, 1) < 0)
1800                 err(1, "unable to limit access to system.dns service");
1801
1802         return (capdnsloc);
1803 }
1804
1805 #if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
1806 #define SECOPT          " [-P policy]"
1807 #else
1808 #define SECOPT          ""
1809 #endif
1810 static void
1811 usage(void)
1812 {
1813
1814         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1815 "usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
1816 "            [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
1817 "           " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
1818 "            [-W waittime] [-z tos] host",
1819 "       ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
1820 "            [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
1821 "            [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
1822 "            [-z tos] mcast-group");
1823         exit(EX_USAGE);
1824 }