sbin/ping/ping6.c

   1 /*      $KAME: ping6.c,v 1.169 2003/07/25 06:01:47 itojun Exp $ */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  *
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*      BSDI    ping.c,v 2.3 1996/01/21 17:56:50 jch Exp        */
  35
  36 /*
  37  * Copyright (c) 1989, 1993
  38  *      The Regents of the University of California.  All rights reserved.
  39  *
  40  * This code is derived from software contributed to Berkeley by
  41  * Mike Muuss.
  42  *
  43  * Redistribution and use in source and binary forms, with or without
  44  * modification, are permitted provided that the following conditions
  45  * are met:
  46  * 1. Redistributions of source code must retain the above copyright
  47  *    notice, this list of conditions and the following disclaimer.
  48  * 2. Redistributions in binary form must reproduce the above copyright
  49  *    notice, this list of conditions and the following disclaimer in the
  50  *    documentation and/or other materials provided with the distribution.
  51  * 3. Neither the name of the University nor the names of its contributors
  52  *    may be used to endorse or promote products derived from this software
  53  *    without specific prior written permission.
  54  *
  55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  65  * SUCH DAMAGE.
  66  */
  67
  68 #if 0
  69 #ifndef lint
  70 static const char copyright[] =
  71 "@(#) Copyright (c) 1989, 1993\n\
  72         The Regents of the University of California.  All rights reserved.\n";
  73 #endif /* not lint */
  74
  75 #ifndef lint
  76 static char sccsid[] = "@(#)ping.c      8.1 (Berkeley) 6/5/93";
  77 #endif /* not lint */
  78 #endif
  79
  80 #include <sys/cdefs.h>
  81 __FBSDID("$FreeBSD$");
  82
  83 /*
  84  * Using the InterNet Control Message Protocol (ICMP) "ECHO" facility,
  85  * measure round-trip-delays and packet loss across network paths.
  86  *
  87  * Author -
  88  *      Mike Muuss
  89  *      U. S. Army Ballistic Research Laboratory
  90  *      December, 1983
  91  *
  92  * Status -
  93  *      Public Domain.  Distribution Unlimited.
  94  * Bugs -
  95  *      More statistics could always be gathered.
  96  *      This program has to run SUID to ROOT to access the ICMP socket.
  97  */
  98 /*
  99  * NOTE:
 100  * USE_SIN6_SCOPE_ID assumes that sin6_scope_id has the same semantics
 101  * as IPV6_PKTINFO.  Some people object it (sin6_scope_id specifies *link*
 102  * while IPV6_PKTINFO specifies *interface*.  Link is defined as collection of
 103  * network attached to 1 or more interfaces)
 104  */
 105
 106 #include <sys/param.h>
 107 #include <sys/capsicum.h>
 108 #include <sys/uio.h>
 109 #include <sys/socket.h>
 110
 111 #include <net/if.h>
 112 #include <net/route.h>
 113
 114 #include <netinet/in.h>
 115 #include <netinet/ip6.h>
 116 #include <netinet/icmp6.h>
 117 #include <arpa/inet.h>
 118 #include <arpa/nameser.h>
 119 #include <netdb.h>
 120
 121 #include <capsicum_helpers.h>
 122 #include <casper/cap_dns.h>
 123 #include <libcasper.h>
 124
 125 #include <ctype.h>
 126 #include <err.h>
 127 #include <errno.h>
 128 #include <fcntl.h>
 129 #include <math.h>
 130 #include <signal.h>
 131 #include <stdio.h>
 132 #include <stdlib.h>
 133 #include <string.h>
 134 #include <sysexits.h>
 135 #include <time.h>
 136 #include <unistd.h>
 137
 138 #ifdef IPSEC
 139 #include <netipsec/ah.h>
 140 #include <netipsec/ipsec.h>
 141 #endif
 142
 143 #include <md5.h>
 144
 145 #include "main.h"
 146 #include "ping6.h"
 147
 148 struct tv32 {
 149         u_int32_t tv32_sec;
 150         u_int32_t tv32_nsec;
 151 };
 152
 153 #define MAXPACKETLEN    131072
 154 #define IP6LEN          40
 155 #define ICMP6ECHOLEN    8       /* icmp echo header len excluding time */
 156 #define ICMP6ECHOTMLEN sizeof(struct tv32)
 157 #define ICMP6_NIQLEN    (ICMP6ECHOLEN + 8)
 158 # define CONTROLLEN     10240   /* ancillary data buffer size RFC3542 20.1 */
 159 /* FQDN case, 64 bits of nonce + 32 bits ttl */
 160 #define ICMP6_NIRLEN    (ICMP6ECHOLEN + 12)
 161 #define EXTRA           256     /* for AH and various other headers. weird. */
 162 #define DEFDATALEN      ICMP6ECHOTMLEN
 163 #define MAXDATALEN      MAXPACKETLEN - IP6LEN - ICMP6ECHOLEN
 164 #define NROUTES         9               /* number of record route slots */
 165 #define MAXWAIT         10000           /* max ms to wait for response */
 166 #define MAXALARM        (60 * 60)       /* max seconds for alarm timeout */
 167
 168 #define A(bit)          rcvd_tbl[(bit)>>3]      /* identify byte in array */
 169 #define B(bit)          (1 << ((bit) & 0x07))   /* identify bit in byte */
 170 #define SET(bit)        (A(bit) |= B(bit))
 171 #define CLR(bit)        (A(bit) &= (~B(bit)))
 172 #define TST(bit)        (A(bit) & B(bit))
 173
 174 #define F_FLOOD         0x0001
 175 #define F_INTERVAL      0x0002
 176 #define F_PINGFILLED    0x0008
 177 #define F_QUIET         0x0010
 178 #define F_RROUTE        0x0020
 179 #define F_SO_DEBUG      0x0040
 180 #define F_VERBOSE       0x0100
 181 #ifdef IPSEC
 182 #ifdef IPSEC_POLICY_IPSEC
 183 #define F_POLICY        0x0400
 184 #else
 185 #define F_AUTHHDR       0x0200
 186 #define F_ENCRYPT       0x0400
 187 #endif /*IPSEC_POLICY_IPSEC*/
 188 #endif /*IPSEC*/
 189 #define F_NODEADDR      0x0800
 190 #define F_FQDN          0x1000
 191 #define F_INTERFACE     0x2000
 192 #define F_SRCADDR       0x4000
 193 #define F_HOSTNAME      0x10000
 194 #define F_FQDNOLD       0x20000
 195 #define F_NIGROUP       0x40000
 196 #define F_SUPTYPES      0x80000
 197 #define F_NOMINMTU      0x100000
 198 #define F_ONCE          0x200000
 199 #define F_AUDIBLE       0x400000
 200 #define F_MISSED        0x800000
 201 #define F_DONTFRAG      0x1000000
 202 #define F_NOUSERDATA    (F_NODEADDR | F_FQDN | F_FQDNOLD | F_SUPTYPES)
 203 #define F_WAITTIME      0x2000000
 204 static u_int options;
 205
 206 #define IN6LEN          sizeof(struct in6_addr)
 207 #define SA6LEN          sizeof(struct sockaddr_in6)
 208 #define DUMMY_PORT      10101
 209
 210 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 211
 212 /*
 213  * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
 214  * number of received sequence numbers we can keep track of.  Change 128
 215  * to 8192 for complete accuracy...
 216  */
 217 #define MAX_DUP_CHK     (8 * 8192)
 218 static int mx_dup_ck = MAX_DUP_CHK;
 219 static char rcvd_tbl[MAX_DUP_CHK / 8];
 220
 221 static struct sockaddr_in6 dst; /* who to ping6 */
 222 static struct sockaddr_in6 src; /* src addr of this packet */
 223 static socklen_t srclen;
 224 static size_t datalen = DEFDATALEN;
 225 static int ssend;               /* send socket file descriptor */
 226 static int srecv;               /* receive socket file descriptor */
 227 static u_char outpack[MAXPACKETLEN];
 228 static char BSPACE = '\b';      /* characters written for flood */
 229 static char BBELL = '\a';       /* characters written for AUDIBLE */
 230 static char DOT = '.';
 231 static char *hostname;
 232 static int ident;               /* process id to identify our packets */
 233 static u_int8_t nonce[8];       /* nonce field for node information */
 234 static int hoplimit = -1;       /* hoplimit */
 235 static int tclass = -1;         /* traffic class */
 236 static int pcp = -2;            /* vlan priority code point */
 237 static u_char *packet = NULL;
 238 static cap_channel_t *capdns;
 239
 240 /* counters */
 241 static long nmissedmax;         /* max value of ntransmitted - nreceived - 1 */
 242 static long npackets;           /* max packets to transmit */
 243 static long nreceived;          /* # of packets we got back */
 244 static long nrepeats;           /* number of duplicates */
 245 static long ntransmitted;       /* sequence # for outbound packets = #sent */
 246 static long ntransmitfailures;  /* number of transmit failures */
 247 static int interval = 1000;     /* interval between packets in ms */
 248 static int waittime = MAXWAIT;  /* timeout for each packet */
 249 static long nrcvtimeout = 0;    /* # of packets we got back after waittime */
 250
 251 /* timing */
 252 static int timing;              /* flag to do timing */
 253 static double tmin = 999999999.0;       /* minimum round trip time */
 254 static double tmax = 0.0;       /* maximum round trip time */
 255 static double tsum = 0.0;       /* sum of all times, for doing average */
 256 static double tsumsq = 0.0;     /* sum of all times squared, for std. dev. */
 257
 258 /* for node addresses */
 259 static u_short naflags;
 260
 261 /* for ancillary data(advanced API) */
 262 static struct msghdr smsghdr;
 263 static struct iovec smsgiov;
 264 static char *scmsg = 0;
 265
 266 static volatile sig_atomic_t seenint;
 267 #ifdef SIGINFO
 268 static volatile sig_atomic_t seeninfo;
 269 #endif
 270
 271 static cap_channel_t *capdns_setup(void);
 272 static void      fill(char *, char *);
 273 static int       get_hoplim(struct msghdr *);
 274 static int       get_pathmtu(struct msghdr *);
 275 static struct in6_pktinfo *get_rcvpktinfo(struct msghdr *);
 276 static void      onsignal(int);
 277 static void      onint(int);
 278 static size_t    pingerlen(void);
 279 static int       pinger(void);
 280 static const char *pr_addr(struct sockaddr *, int);
 281 static void      pr_icmph(struct icmp6_hdr *, u_char *);
 282 static void      pr_iph(struct ip6_hdr *);
 283 static void      pr_suptypes(struct icmp6_nodeinfo *, size_t);
 284 static void      pr_nodeaddr(struct icmp6_nodeinfo *, int);
 285 static int       myechoreply(const struct icmp6_hdr *);
 286 static int       mynireply(const struct icmp6_nodeinfo *);
 287 static const char *dnsdecode(const u_char *, const u_char *, const u_char *,
 288     char *, size_t);
 289 static void      pr_pack(u_char *, int, struct msghdr *);
 290 static void      pr_exthdrs(struct msghdr *);
 291 static void      pr_ip6opt(void *, size_t);
 292 static void      pr_rthdr(void *, size_t);
 293 static int       pr_bitrange(u_int32_t, int, int);
 294 static void      pr_retip(struct ip6_hdr *, u_char *);
 295 static void      summary(void);
 296 static int       setpolicy(int, char *);
 297 static char     *nigroup(char *, int);
 298
 299 int
 300 ping6(int argc, char *argv[])
 301 {
 302         struct timespec last, intvl;
 303         struct sockaddr_in6 from, *sin6;
 304         struct addrinfo hints, *res;
 305         struct sigaction si_sa;
 306         int cc, i;
 307         int almost_done, ch, hold, packlen, preload, optval, error;
 308         int nig_oldmcprefix = -1;
 309         u_char *datap;
 310         char *e, *target, *ifname = NULL, *gateway = NULL;
 311         int ip6optlen = 0;
 312         struct cmsghdr *scmsgp = NULL;
 313         /* For control (ancillary) data received from recvmsg() */
 314         u_char cm[CONTROLLEN];
 315 #if defined(SO_SNDBUF) && defined(SO_RCVBUF)
 316         u_long lsockbufsize;
 317         int sockbufsize = 0;
 318 #endif
 319         int usepktinfo = 0;
 320         struct in6_pktinfo pktinfo;
 321         char *cmsg_pktinfo = NULL;
 322         struct ip6_rthdr *rthdr = NULL;
 323 #ifdef IPSEC_POLICY_IPSEC
 324         char *policy_in = NULL;
 325         char *policy_out = NULL;
 326 #endif
 327         double t;
 328         u_long alarmtimeout;
 329         size_t rthlen;
 330 #ifdef IPV6_USE_MIN_MTU
 331         int mflag = 0;
 332 #endif
 333         cap_rights_t rights_srecv;
 334         cap_rights_t rights_ssend;
 335         cap_rights_t rights_stdin;
 336
 337         /* just to be sure */
 338         memset(&smsghdr, 0, sizeof(smsghdr));
 339         memset(&smsgiov, 0, sizeof(smsgiov));
 340         memset(&pktinfo, 0, sizeof(pktinfo));
 341
 342         intvl.tv_sec = interval / 1000;
 343         intvl.tv_nsec = interval % 1000 * 1000000;
 344
 345         alarmtimeout = preload = 0;
 346         datap = &outpack[ICMP6ECHOLEN + ICMP6ECHOTMLEN];
 347         capdns = capdns_setup();
 348 #ifndef IPSEC
 349 #define ADDOPTS
 350 #else
 351 #ifdef IPSEC_POLICY_IPSEC
 352 #define ADDOPTS "P:"
 353 #else
 354 #define ADDOPTS "ZE"
 355 #endif /*IPSEC_POLICY_IPSEC*/
 356 #endif
 357         while ((ch = getopt(argc, argv,
 358             "6k:b:C:c:DdfHe:m:I:i:l:unNop:qaAS:s:OvyYW:t:z:" ADDOPTS)) != -1) {
 359 #undef ADDOPTS
 360                 switch (ch) {
 361                 case '6':
 362                         /* This option is processed in main(). */
 363                         break;
 364                 case 'k':
 365                 {
 366                         char *cp;
 367
 368                         options &= ~F_NOUSERDATA;
 369                         options |= F_NODEADDR;
 370                         for (cp = optarg; *cp != '\0'; cp++) {
 371                                 switch (*cp) {
 372                                 case 'a':
 373                                         naflags |= NI_NODEADDR_FLAG_ALL;
 374                                         break;
 375                                 case 'c':
 376                                 case 'C':
 377                                         naflags |= NI_NODEADDR_FLAG_COMPAT;
 378                                         break;
 379                                 case 'l':
 380                                 case 'L':
 381                                         naflags |= NI_NODEADDR_FLAG_LINKLOCAL;
 382                                         break;
 383                                 case 's':
 384                                 case 'S':
 385                                         naflags |= NI_NODEADDR_FLAG_SITELOCAL;
 386                                         break;
 387                                 case 'g':
 388                                 case 'G':
 389                                         naflags |= NI_NODEADDR_FLAG_GLOBAL;
 390                                         break;
 391                                 case 'A': /* experimental. not in the spec */
 392 #ifdef NI_NODEADDR_FLAG_ANYCAST
 393                                         naflags |= NI_NODEADDR_FLAG_ANYCAST;
 394                                         break;
 395 #else
 396                                         errx(1,
 397 "-a A is not supported on the platform");
 398                                         /*NOTREACHED*/
 399 #endif
 400                                 default:
 401                                         usage();
 402                                         /*NOTREACHED*/
 403                                 }
 404                         }
 405                         break;
 406                 }
 407                 case 'b':
 408 #if defined(SO_SNDBUF) && defined(SO_RCVBUF)
 409                         errno = 0;
 410                         e = NULL;
 411                         lsockbufsize = strtoul(optarg, &e, 10);
 412                         sockbufsize = (int)lsockbufsize;
 413                         if (errno || !*optarg || *e ||
 414                             lsockbufsize > INT_MAX)
 415                                 errx(1, "invalid socket buffer size");
 416 #else
 417                         errx(1,
 418 "-b option ignored: SO_SNDBUF/SO_RCVBUF socket options not supported");
 419 #endif
 420                         break;
 421                 case 'C':               /* vlan priority code point */
 422                         pcp = strtol(optarg, &e, 10);
 423                         if (*optarg == '\0' || *e != '\0')
 424                                 errx(1, "illegal vlan pcp %s", optarg);
 425                         if (7 < pcp || pcp < -1)
 426                                 errx(1, "illegal vlan pcp -- %s", optarg);
 427                         break;
 428                 case 'c':
 429                         npackets = strtol(optarg, &e, 10);
 430                         if (npackets <= 0 || *optarg == '\0' || *e != '\0')
 431                                 errx(1,
 432                                     "illegal number of packets -- %s", optarg);
 433                         break;
 434                 case 'D':
 435                         options |= F_DONTFRAG;
 436                         break;
 437                 case 'd':
 438                         options |= F_SO_DEBUG;
 439                         break;
 440                 case 'f':
 441                         if (getuid()) {
 442                                 errno = EPERM;
 443                                 errx(1, "Must be superuser to flood ping");
 444                         }
 445                         options |= F_FLOOD;
 446                         setbuf(stdout, (char *)NULL);
 447                         break;
 448                 case 'e':
 449                         gateway = optarg;
 450                         break;
 451                 case 'H':
 452                         options |= F_HOSTNAME;
 453                         break;
 454                 case 'm':               /* hoplimit */
 455                         hoplimit = strtol(optarg, &e, 10);
 456                         if (*optarg == '\0' || *e != '\0')
 457                                 errx(1, "illegal hoplimit %s", optarg);
 458                         if (255 < hoplimit || hoplimit < -1)
 459                                 errx(1,
 460                                     "illegal hoplimit -- %s", optarg);
 461                         break;
 462                 case 'I':
 463                         ifname = optarg;
 464                         options |= F_INTERFACE;
 465 #ifndef USE_SIN6_SCOPE_ID
 466                         usepktinfo++;
 467 #endif
 468                         break;
 469                 case 'i':               /* wait between sending packets */
 470                         t = strtod(optarg, &e);
 471                         if (*optarg == '\0' || *e != '\0')
 472                                 errx(1, "illegal timing interval %s", optarg);
 473                         if (t < 1 && getuid()) {
 474                                 errx(1, "%s: only root may use interval < 1s",
 475                                     strerror(EPERM));
 476                         }
 477                         intvl.tv_sec = (time_t)t;
 478                         intvl.tv_nsec =
 479                             (long)((t - intvl.tv_sec) * 1000000000);
 480                         if (intvl.tv_sec < 0)
 481                                 errx(1, "illegal timing interval %s", optarg);
 482                         /* less than 1/hz does not make sense */
 483                         if (intvl.tv_sec == 0 && intvl.tv_nsec < 1000) {
 484                                 warnx("too small interval, raised to .000001");
 485                                 intvl.tv_nsec = 1000;
 486                         }
 487                         options |= F_INTERVAL;
 488                         break;
 489                 case 'l':
 490                         if (getuid()) {
 491                                 errno = EPERM;
 492                                 errx(1, "Must be superuser to preload");
 493                         }
 494                         preload = strtol(optarg, &e, 10);
 495                         if (preload < 0 || *optarg == '\0' || *e != '\0')
 496                                 errx(1, "illegal preload value -- %s", optarg);
 497                         break;
 498                 case 'u':
 499 #ifdef IPV6_USE_MIN_MTU
 500                         mflag++;
 501                         break;
 502 #else
 503                         errx(1, "-%c is not supported on this platform", ch);
 504                         /*NOTREACHED*/
 505 #endif
 506                 case 'n':
 507                         options &= ~F_HOSTNAME;
 508                         break;
 509                 case 'N':
 510                         options |= F_NIGROUP;
 511                         nig_oldmcprefix++;
 512                         break;
 513                 case 'o':
 514                         options |= F_ONCE;
 515                         break;
 516                 case 'p':               /* fill buffer with user pattern */
 517                         options |= F_PINGFILLED;
 518                         fill((char *)datap, optarg);
 519                                 break;
 520                 case 'q':
 521                         options |= F_QUIET;
 522                         break;
 523                 case 'a':
 524                         options |= F_AUDIBLE;
 525                         break;
 526                 case 'A':
 527                         options |= F_MISSED;
 528                         break;
 529                 case 'S':
 530                         memset(&hints, 0, sizeof(struct addrinfo));
 531                         hints.ai_flags = AI_NUMERICHOST; /* allow hostname? */
 532                         hints.ai_family = AF_INET6;
 533                         hints.ai_socktype = SOCK_RAW;
 534                         hints.ai_protocol = IPPROTO_ICMPV6;
 535
 536                         error = cap_getaddrinfo(capdns, optarg, NULL, &hints, &res);
 537                         if (error) {
 538                                 errx(1, "invalid source address: %s",
 539                                      gai_strerror(error));
 540                         }
 541                         /*
 542                          * res->ai_family must be AF_INET6 and res->ai_addrlen
 543                          * must be sizeof(src).
 544                          */
 545                         memcpy(&src, res->ai_addr, res->ai_addrlen);
 546                         srclen = res->ai_addrlen;
 547                         freeaddrinfo(res);
 548                         options |= F_SRCADDR;
 549                         break;
 550                 case 's':               /* size of packet to send */
 551                         datalen = strtol(optarg, &e, 10);
 552                         if (datalen <= 0 || *optarg == '\0' || *e != '\0')
 553                                 errx(1, "illegal datalen value -- %s", optarg);
 554                         if (datalen > MAXDATALEN) {
 555                                 errx(1,
 556                                     "datalen value too large, maximum is %d",
 557                                     MAXDATALEN);
 558                         }
 559                         break;
 560                 case 'O':
 561                         options &= ~F_NOUSERDATA;
 562                         options |= F_SUPTYPES;
 563                         break;
 564                 case 'v':
 565                         options |= F_VERBOSE;
 566                         break;
 567                 case 'y':
 568                         options &= ~F_NOUSERDATA;
 569                         options |= F_FQDN;
 570                         break;
 571                 case 'Y':
 572                         options &= ~F_NOUSERDATA;
 573                         options |= F_FQDNOLD;
 574                         break;
 575                 case 'W':
 576                         t = strtod(optarg, &e);
 577                         if (*e || e == optarg || t > (double)INT_MAX)
 578                                 err(EX_USAGE, "invalid timing interval: `%s'",
 579                                     optarg);
 580                         options |= F_WAITTIME;
 581                         waittime = (int)t;
 582                         break;
 583                 case 't':
 584                         alarmtimeout = strtoul(optarg, &e, 0);
 585                         if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
 586                                 errx(EX_USAGE, "invalid timeout: `%s'",
 587                                     optarg);
 588                         if (alarmtimeout > MAXALARM)
 589                                 errx(EX_USAGE, "invalid timeout: `%s' > %d",
 590                                     optarg, MAXALARM);
 591                         {
 592                                 struct itimerval itv;
 593
 594                                 timerclear(&itv.it_interval);
 595                                 timerclear(&itv.it_value);
 596                                 itv.it_value.tv_sec = (time_t)alarmtimeout;
 597                                 if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
 598                                         err(1, "setitimer");
 599                         }
 600                         break;
 601                 case 'z':               /* traffic class */
 602                         tclass = strtol(optarg, &e, 10);
 603                         if (*optarg == '\0' || *e != '\0')
 604                                 errx(1, "illegal traffic class %s", optarg);
 605                         if (255 < tclass || tclass < -1)
 606                                 errx(1,
 607                                     "illegal traffic class -- %s", optarg);
 608                         break;
 609 #ifdef IPSEC
 610 #ifdef IPSEC_POLICY_IPSEC
 611                 case 'P':
 612                         options |= F_POLICY;
 613                         if (!strncmp("in", optarg, 2)) {
 614                                 if ((policy_in = strdup(optarg)) == NULL)
 615                                         errx(1, "strdup");
 616                         } else if (!strncmp("out", optarg, 3)) {
 617                                 if ((policy_out = strdup(optarg)) == NULL)
 618                                         errx(1, "strdup");
 619                         } else
 620                                 errx(1, "invalid security policy");
 621                         break;
 622 #else
 623                 case 'Z':
 624                         options |= F_AUTHHDR;
 625                         break;
 626                 case 'E':
 627                         options |= F_ENCRYPT;
 628                         break;
 629 #endif /*IPSEC_POLICY_IPSEC*/
 630 #endif /*IPSEC*/
 631                 default:
 632                         usage();
 633                         /*NOTREACHED*/
 634                 }
 635         }
 636
 637         argc -= optind;
 638         argv += optind;
 639
 640         if (argc < 1) {
 641                 usage();
 642                 /*NOTREACHED*/
 643         }
 644
 645         if (argc > 1) {
 646 #ifdef IPV6_RECVRTHDR   /* 2292bis */
 647                 rthlen = CMSG_SPACE(inet6_rth_space(IPV6_RTHDR_TYPE_0,
 648                     argc - 1));
 649 #else  /* RFC2292 */
 650                 rthlen = inet6_rthdr_space(IPV6_RTHDR_TYPE_0, argc - 1);
 651 #endif
 652                 if (rthlen == 0) {
 653                         errx(1, "too many intermediate hops");
 654                         /*NOTREACHED*/
 655                 }
 656                 ip6optlen += rthlen;
 657         }
 658
 659         if (options & F_NIGROUP) {
 660                 target = nigroup(argv[argc - 1], nig_oldmcprefix);
 661                 if (target == NULL) {
 662                         usage();
 663                         /*NOTREACHED*/
 664                 }
 665         } else
 666                 target = argv[argc - 1];
 667
 668         /* cap_getaddrinfo */
 669         memset(&hints, 0, sizeof(struct addrinfo));
 670         hints.ai_flags = AI_CANONNAME;
 671         hints.ai_family = AF_INET6;
 672         hints.ai_socktype = SOCK_RAW;
 673         hints.ai_protocol = IPPROTO_ICMPV6;
 674
 675         error = cap_getaddrinfo(capdns, target, NULL, &hints, &res);
 676         if (error)
 677                 errx(1, "%s", gai_strerror(error));
 678         if (res->ai_canonname)
 679                 hostname = strdup(res->ai_canonname);
 680         else
 681                 hostname = target;
 682
 683         if (!res->ai_addr)
 684                 errx(1, "cap_getaddrinfo failed");
 685
 686         (void)memcpy(&dst, res->ai_addr, res->ai_addrlen);
 687
 688         if ((ssend = socket(res->ai_family, res->ai_socktype,
 689             res->ai_protocol)) < 0)
 690                 err(1, "socket ssend");
 691         if ((srecv = socket(res->ai_family, res->ai_socktype,
 692             res->ai_protocol)) < 0)
 693                 err(1, "socket srecv");
 694         freeaddrinfo(res);
 695
 696         /* set the source address if specified. */
 697         if ((options & F_SRCADDR) != 0) {
 698                 /* properly fill sin6_scope_id */
 699                 if (IN6_IS_ADDR_LINKLOCAL(&src.sin6_addr) && (
 700                     IN6_IS_ADDR_LINKLOCAL(&dst.sin6_addr) ||
 701                     IN6_IS_ADDR_MC_LINKLOCAL(&dst.sin6_addr) ||
 702                     IN6_IS_ADDR_MC_NODELOCAL(&dst.sin6_addr))) {
 703                         if (src.sin6_scope_id == 0)
 704                                 src.sin6_scope_id = dst.sin6_scope_id;
 705                         if (dst.sin6_scope_id == 0)
 706                                 dst.sin6_scope_id = src.sin6_scope_id;
 707                 }
 708                 if (bind(ssend, (struct sockaddr *)&src, srclen) != 0)
 709                         err(1, "bind");
 710         }
 711         /* set the gateway (next hop) if specified */
 712         if (gateway) {
 713                 memset(&hints, 0, sizeof(hints));
 714                 hints.ai_family = AF_INET6;
 715                 hints.ai_socktype = SOCK_RAW;
 716                 hints.ai_protocol = IPPROTO_ICMPV6;
 717
 718                 error = cap_getaddrinfo(capdns, gateway, NULL, &hints, &res);
 719                 if (error) {
 720                         errx(1, "cap_getaddrinfo for the gateway %s: %s",
 721                              gateway, gai_strerror(error));
 722                 }
 723                 if (res->ai_next && (options & F_VERBOSE))
 724                         warnx("gateway resolves to multiple addresses");
 725
 726                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_NEXTHOP,
 727                     res->ai_addr, res->ai_addrlen)) {
 728                         err(1, "setsockopt(IPV6_NEXTHOP)");
 729                 }
 730
 731                 freeaddrinfo(res);
 732         }
 733
 734         /*
 735          * let the kerel pass extension headers of incoming packets,
 736          * for privileged socket options
 737          */
 738         if ((options & F_VERBOSE) != 0) {
 739                 int opton = 1;
 740
 741 #ifdef IPV6_RECVHOPOPTS
 742                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVHOPOPTS, &opton,
 743                     sizeof(opton)))
 744                         err(1, "setsockopt(IPV6_RECVHOPOPTS)");
 745 #else  /* old adv. API */
 746                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_HOPOPTS, &opton,
 747                     sizeof(opton)))
 748                         err(1, "setsockopt(IPV6_HOPOPTS)");
 749 #endif
 750 #ifdef IPV6_RECVDSTOPTS
 751                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVDSTOPTS, &opton,
 752                     sizeof(opton)))
 753                         err(1, "setsockopt(IPV6_RECVDSTOPTS)");
 754 #else  /* old adv. API */
 755                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_DSTOPTS, &opton,
 756                     sizeof(opton)))
 757                         err(1, "setsockopt(IPV6_DSTOPTS)");
 758 #endif
 759 #ifdef IPV6_RECVRTHDRDSTOPTS
 760                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVRTHDRDSTOPTS, &opton,
 761                     sizeof(opton)))
 762                         err(1, "setsockopt(IPV6_RECVRTHDRDSTOPTS)");
 763 #endif
 764         }
 765
 766         /* revoke root privilege */
 767         if (seteuid(getuid()) != 0)
 768                 err(1, "seteuid() failed");
 769         if (setuid(getuid()) != 0)
 770                 err(1, "setuid() failed");
 771
 772         if ((options & F_FLOOD) && (options & F_INTERVAL))
 773                 errx(1, "-f and -i incompatible options");
 774
 775         if ((options & F_NOUSERDATA) == 0) {
 776                 if (datalen >= sizeof(struct tv32)) {
 777                         /* we can time transfer */
 778                         timing = 1;
 779                 } else
 780                         timing = 0;
 781                 /* in F_VERBOSE case, we may get non-echoreply packets*/
 782                 if (options & F_VERBOSE)
 783                         packlen = 2048 + IP6LEN + ICMP6ECHOLEN + EXTRA;
 784                 else
 785                         packlen = datalen + IP6LEN + ICMP6ECHOLEN + EXTRA;
 786         } else {
 787                 /* suppress timing for node information query */
 788                 timing = 0;
 789                 datalen = 2048;
 790                 packlen = 2048 + IP6LEN + ICMP6ECHOLEN + EXTRA;
 791         }
 792
 793         if (!(packet = (u_char *)malloc((u_int)packlen)))
 794                 err(1, "Unable to allocate packet");
 795         if (!(options & F_PINGFILLED))
 796                 for (i = ICMP6ECHOLEN; i < packlen; ++i)
 797                         *datap++ = i;
 798
 799         ident = getpid() & 0xFFFF;
 800         arc4random_buf(nonce, sizeof(nonce));
 801         optval = 1;
 802         if (options & F_DONTFRAG)
 803                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_DONTFRAG,
 804                     &optval, sizeof(optval)) == -1)
 805                         err(1, "IPV6_DONTFRAG");
 806         hold = 1;
 807
 808         if (options & F_SO_DEBUG) {
 809                 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 810                     sizeof(hold));
 811                 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 812                     sizeof(hold));
 813         }
 814         optval = IPV6_DEFHLIM;
 815         if (IN6_IS_ADDR_MULTICAST(&dst.sin6_addr))
 816                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 817                     &optval, sizeof(optval)) == -1)
 818                         err(1, "IPV6_MULTICAST_HOPS");
 819 #ifdef IPV6_USE_MIN_MTU
 820         if (mflag != 1) {
 821                 optval = mflag > 1 ? 0 : 1;
 822
 823                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
 824                     &optval, sizeof(optval)) == -1)
 825                         err(1, "setsockopt(IPV6_USE_MIN_MTU)");
 826         }
 827 #ifdef IPV6_RECVPATHMTU
 828         else {
 829                 optval = 1;
 830                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVPATHMTU,
 831                     &optval, sizeof(optval)) == -1)
 832                         err(1, "setsockopt(IPV6_RECVPATHMTU)");
 833         }
 834 #endif /* IPV6_RECVPATHMTU */
 835 #endif /* IPV6_USE_MIN_MTU */
 836
 837 #ifdef IPSEC
 838 #ifdef IPSEC_POLICY_IPSEC
 839         if (options & F_POLICY) {
 840                 if (setpolicy(srecv, policy_in) < 0)
 841                         errx(1, "%s", ipsec_strerror());
 842                 if (setpolicy(ssend, policy_out) < 0)
 843                         errx(1, "%s", ipsec_strerror());
 844         }
 845 #else
 846         if (options & F_AUTHHDR) {
 847                 optval = IPSEC_LEVEL_REQUIRE;
 848 #ifdef IPV6_AUTH_TRANS_LEVEL
 849                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL,
 850                     &optval, sizeof(optval)) == -1)
 851                         err(1, "setsockopt(IPV6_AUTH_TRANS_LEVEL)");
 852                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL,
 853                      &optval, sizeof(optval)) == -1)
 854                         err(1, "setsockopt(IPV6_AUTH_TRANS_LEVEL)");
 855 #else /* old def */
 856                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_AUTH_LEVEL,
 857                     &optval, sizeof(optval)) == -1)
 858                         err(1, "setsockopt(IPV6_AUTH_LEVEL)");
 859                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_AUTH_LEVEL,
 860                     &optval, sizeof(optval)) == -1)
 861                         err(1, "setsockopt(IPV6_AUTH_LEVEL)");
 862 #endif
 863         }
 864         if (options & F_ENCRYPT) {
 865                 optval = IPSEC_LEVEL_REQUIRE;
 866                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL,
 867                     &optval, sizeof(optval)) == -1)
 868                         err(1, "setsockopt(IPV6_ESP_TRANS_LEVEL)");
 869                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL,
 870                     &optval, sizeof(optval)) == -1)
 871                         err(1, "setsockopt(IPV6_ESP_TRANS_LEVEL)");
 872         }
 873 #endif /*IPSEC_POLICY_IPSEC*/
 874 #endif
 875
 876 #ifdef ICMP6_FILTER
 877     {
 878         struct icmp6_filter filt;
 879         if (!(options & F_VERBOSE)) {
 880                 ICMP6_FILTER_SETBLOCKALL(&filt);
 881                 if ((options & F_FQDN) || (options & F_FQDNOLD) ||
 882                     (options & F_NODEADDR) || (options & F_SUPTYPES))
 883                         ICMP6_FILTER_SETPASS(ICMP6_NI_REPLY, &filt);
 884                 else
 885                         ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
 886         } else {
 887                 ICMP6_FILTER_SETPASSALL(&filt);
 888         }
 889         if (setsockopt(srecv, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
 890             sizeof(filt)) < 0)
 891                 err(1, "setsockopt(ICMP6_FILTER)");
 892     }
 893 #endif /*ICMP6_FILTER*/
 894
 895         /* let the kerel pass extension headers of incoming packets */
 896         if ((options & F_VERBOSE) != 0) {
 897                 int opton = 1;
 898
 899 #ifdef IPV6_RECVRTHDR
 900                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVRTHDR, &opton,
 901                     sizeof(opton)))
 902                         err(1, "setsockopt(IPV6_RECVRTHDR)");
 903 #else  /* old adv. API */
 904                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RTHDR, &opton,
 905                     sizeof(opton)))
 906                         err(1, "setsockopt(IPV6_RTHDR)");
 907 #endif
 908         }
 909
 910 /*
 911         optval = 1;
 912         if (IN6_IS_ADDR_MULTICAST(&dst.sin6_addr))
 913                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 914                     &optval, sizeof(optval)) == -1)
 915                         err(1, "IPV6_MULTICAST_LOOP");
 916 */
 917
 918         /* Specify the outgoing interface and/or the source address */
 919         if (usepktinfo)
 920                 ip6optlen += CMSG_SPACE(sizeof(struct in6_pktinfo));
 921
 922         if (hoplimit != -1)
 923                 ip6optlen += CMSG_SPACE(sizeof(int));
 924
 925         /* set IP6 packet options */
 926         if (ip6optlen) {
 927                 if ((scmsg = (char *)malloc(ip6optlen)) == NULL)
 928                         errx(1, "can't allocate enough memory");
 929                 smsghdr.msg_control = (caddr_t)scmsg;
 930                 smsghdr.msg_controllen = ip6optlen;
 931                 scmsgp = CMSG_FIRSTHDR(&smsghdr);
 932         }
 933         if (usepktinfo) {
 934                 cmsg_pktinfo = CMSG_DATA(scmsgp);
 935                 scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 936                 scmsgp->cmsg_level = IPPROTO_IPV6;
 937                 scmsgp->cmsg_type = IPV6_PKTINFO;
 938                 scmsgp = CMSG_NXTHDR(&smsghdr, scmsgp);
 939         }
 940
 941         /* set the outgoing interface */
 942         if (ifname) {
 943 #ifndef USE_SIN6_SCOPE_ID
 944                 /* pktinfo must have already been allocated */
 945                 if ((pktinfo.ipi6_ifindex = if_nametoindex(ifname)) == 0)
 946                         errx(1, "%s: invalid interface name", ifname);
 947 #else
 948                 if ((dst.sin6_scope_id = if_nametoindex(ifname)) == 0)
 949                         errx(1, "%s: invalid interface name", ifname);
 950 #endif
 951         }
 952         if (hoplimit != -1) {
 953                 scmsgp->cmsg_len = CMSG_LEN(sizeof(int));
 954                 scmsgp->cmsg_level = IPPROTO_IPV6;
 955                 scmsgp->cmsg_type = IPV6_HOPLIMIT;
 956                 memcpy(CMSG_DATA(scmsgp), &hoplimit, sizeof(hoplimit));
 957
 958                 scmsgp = CMSG_NXTHDR(&smsghdr, scmsgp);
 959         }
 960
 961         if (tclass != -1) {
 962                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_TCLASS,
 963                     &tclass, sizeof(tclass)) == -1)
 964                         err(1, "setsockopt(IPV6_TCLASS)");
 965         }
 966
 967         if (pcp != -2) {
 968                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_VLAN_PCP,
 969                     &pcp, sizeof(pcp)) == -1)
 970                         err(1, "setsockopt(IPV6_VLAN_PCP)");
 971         }
 972
 973         if (argc > 1) { /* some intermediate addrs are specified */
 974                 int hops;
 975                 int rthdrlen;
 976
 977                 rthdrlen = inet6_rth_space(IPV6_RTHDR_TYPE_0, argc - 1);
 978                 scmsgp->cmsg_len = CMSG_LEN(rthdrlen);
 979                 scmsgp->cmsg_level = IPPROTO_IPV6;
 980                 scmsgp->cmsg_type = IPV6_RTHDR;
 981                 rthdr = (struct ip6_rthdr *)CMSG_DATA(scmsgp);
 982                 rthdr = inet6_rth_init((void *)rthdr, rthdrlen,
 983                     IPV6_RTHDR_TYPE_0, argc - 1);
 984                 if (rthdr == NULL)
 985                         errx(1, "can't initialize rthdr");
 986
 987                 for (hops = 0; hops < argc - 1; hops++) {
 988                         memset(&hints, 0, sizeof(hints));
 989                         hints.ai_family = AF_INET6;
 990
 991                         if ((error = cap_getaddrinfo(capdns, argv[hops], NULL, &hints,
 992                             &res)))
 993                                 errx(1, "%s", gai_strerror(error));
 994                         if (res->ai_addr->sa_family != AF_INET6)
 995                                 errx(1,
 996                                     "bad addr family of an intermediate addr");
 997                         sin6 = (struct sockaddr_in6 *)(void *)res->ai_addr;
 998                         if (inet6_rth_add(rthdr, &sin6->sin6_addr))
 999                                 errx(1, "can't add an intermediate node");
1000                         freeaddrinfo(res);
1001                 }
1002
1003                 scmsgp = CMSG_NXTHDR(&smsghdr, scmsgp);
1004         }
1005
1006         /* From now on we will use only reverse DNS lookups. */
1007 #ifdef WITH_CASPER
1008         if (capdns != NULL) {
1009                 const char *types[1];
1010
1011                 types[0] = "ADDR2NAME";
1012                 if (cap_dns_type_limit(capdns, types, nitems(types)) < 0)
1013                         err(1, "unable to limit access to system.dns service");
1014         }
1015 #endif
1016         if (!(options & F_SRCADDR)) {
1017                 /*
1018                  * get the source address. XXX since we revoked the root
1019                  * privilege, we cannot use a raw socket for this.
1020                  */
1021                 int dummy;
1022                 socklen_t len = sizeof(src);
1023
1024                 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1025                         err(1, "UDP socket");
1026
1027                 src.sin6_family = AF_INET6;
1028                 src.sin6_addr = dst.sin6_addr;
1029                 src.sin6_port = ntohs(DUMMY_PORT);
1030                 src.sin6_scope_id = dst.sin6_scope_id;
1031
1032                 if (usepktinfo &&
1033                     setsockopt(dummy, IPPROTO_IPV6, IPV6_PKTINFO,
1034                     (void *)&pktinfo, sizeof(pktinfo)))
1035                         err(1, "UDP setsockopt(IPV6_PKTINFO)");
1036
1037                 if (hoplimit != -1 &&
1038                     setsockopt(dummy, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1039                     (void *)&hoplimit, sizeof(hoplimit)))
1040                         err(1, "UDP setsockopt(IPV6_UNICAST_HOPS)");
1041
1042                 if (hoplimit != -1 &&
1043                     setsockopt(dummy, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1044                     (void *)&hoplimit, sizeof(hoplimit)))
1045                         err(1, "UDP setsockopt(IPV6_MULTICAST_HOPS)");
1046
1047                 if (rthdr &&
1048                     setsockopt(dummy, IPPROTO_IPV6, IPV6_RTHDR,
1049                     (void *)rthdr, (rthdr->ip6r_len + 1) << 3))
1050                         err(1, "UDP setsockopt(IPV6_RTHDR)");
1051
1052                 if (connect(dummy, (struct sockaddr *)&src, len) < 0)
1053                         err(1, "UDP connect");
1054
1055                 if (getsockname(dummy, (struct sockaddr *)&src, &len) < 0)
1056                         err(1, "getsockname");
1057
1058                 close(dummy);
1059         }
1060
1061         /* Save pktinfo in the ancillary data. */
1062         if (usepktinfo)
1063                 memcpy(cmsg_pktinfo, &pktinfo, sizeof(pktinfo));
1064
1065         if (connect(ssend, (struct sockaddr *)&dst, sizeof(dst)) != 0)
1066                 err(1, "connect() ssend");
1067
1068         caph_cache_catpages();
1069         if (caph_enter_casper() < 0)
1070                 err(1, "caph_enter_casper");
1071
1072         cap_rights_init(&rights_stdin);
1073         if (caph_rights_limit(STDIN_FILENO, &rights_stdin) < 0)
1074                 err(1, "caph_rights_limit stdin");
1075         if (caph_limit_stdout() < 0)
1076                 err(1, "caph_limit_stdout");
1077         if (caph_limit_stderr() < 0)
1078                 err(1, "caph_limit_stderr");
1079
1080         cap_rights_init(&rights_srecv, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
1081         if (caph_rights_limit(srecv, &rights_srecv) < 0)
1082                 err(1, "caph_rights_limit srecv");
1083         cap_rights_init(&rights_ssend, CAP_SEND, CAP_SETSOCKOPT);
1084         if (caph_rights_limit(ssend, &rights_ssend) < 0)
1085                 err(1, "caph_rights_limit ssend");
1086
1087 #if defined(SO_SNDBUF) && defined(SO_RCVBUF)
1088         if (sockbufsize) {
1089                 if (datalen > (size_t)sockbufsize)
1090                         warnx("you need -b to increase socket buffer size");
1091                 if (setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, &sockbufsize,
1092                     sizeof(sockbufsize)) < 0)
1093                         err(1, "setsockopt(SO_SNDBUF)");
1094                 if (setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, &sockbufsize,
1095                     sizeof(sockbufsize)) < 0)
1096                         err(1, "setsockopt(SO_RCVBUF)");
1097         }
1098         else {
1099                 if (datalen > 8 * 1024) /*XXX*/
1100                         warnx("you need -b to increase socket buffer size");
1101                 /*
1102                  * When pinging the broadcast address, you can get a lot of
1103                  * answers. Doing something so evil is useful if you are trying
1104                  * to stress the ethernet, or just want to fill the arp cache
1105                  * to get some stuff for /etc/ethers.
1106                  */
1107                 hold = 48 * 1024;
1108                 setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
1109                     sizeof(hold));
1110         }
1111 #endif
1112
1113         optval = 1;
1114 #ifndef USE_SIN6_SCOPE_ID
1115 #ifdef IPV6_RECVPKTINFO
1116         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVPKTINFO, &optval,
1117             sizeof(optval)) < 0)
1118                 warn("setsockopt(IPV6_RECVPKTINFO)"); /* XXX err? */
1119 #else  /* old adv. API */
1120         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_PKTINFO, &optval,
1121             sizeof(optval)) < 0)
1122                 warn("setsockopt(IPV6_PKTINFO)"); /* XXX err? */
1123 #endif
1124 #endif /* USE_SIN6_SCOPE_ID */
1125 #ifdef IPV6_RECVHOPLIMIT
1126         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &optval,
1127             sizeof(optval)) < 0)
1128                 warn("setsockopt(IPV6_RECVHOPLIMIT)"); /* XXX err? */
1129 #else  /* old adv. API */
1130         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_HOPLIMIT, &optval,
1131             sizeof(optval)) < 0)
1132                 warn("setsockopt(IPV6_HOPLIMIT)"); /* XXX err? */
1133 #endif
1134
1135         cap_rights_clear(&rights_srecv, CAP_SETSOCKOPT);
1136         if (caph_rights_limit(srecv, &rights_srecv) < 0)
1137                 err(1, "caph_rights_limit srecv setsockopt");
1138         cap_rights_clear(&rights_ssend, CAP_SETSOCKOPT);
1139         if (caph_rights_limit(ssend, &rights_ssend) < 0)
1140                 err(1, "caph_rights_limit ssend setsockopt");
1141
1142         printf("PING6(%lu=40+8+%lu bytes) ", (unsigned long)(40 + pingerlen()),
1143             (unsigned long)(pingerlen() - 8));
1144         printf("%s --> ", pr_addr((struct sockaddr *)&src, sizeof(src)));
1145         printf("%s\n", pr_addr((struct sockaddr *)&dst, sizeof(dst)));
1146
1147         if (preload == 0)
1148                 pinger();
1149         else {
1150                 if (npackets != 0 && preload > npackets)
1151                         preload = npackets;
1152                 while (preload--)
1153                         pinger();
1154         }
1155         clock_gettime(CLOCK_MONOTONIC, &last);
1156
1157         sigemptyset(&si_sa.sa_mask);
1158         si_sa.sa_flags = 0;
1159         si_sa.sa_handler = onsignal;
1160         if (sigaction(SIGINT, &si_sa, 0) == -1)
1161                 err(EX_OSERR, "sigaction SIGINT");
1162         seenint = 0;
1163 #ifdef SIGINFO
1164         if (sigaction(SIGINFO, &si_sa, 0) == -1)
1165                 err(EX_OSERR, "sigaction SIGINFO");
1166         seeninfo = 0;
1167 #endif
1168         if (alarmtimeout > 0) {
1169                 if (sigaction(SIGALRM, &si_sa, 0) == -1)
1170                         err(EX_OSERR, "sigaction SIGALRM");
1171         }
1172         if (options & F_FLOOD) {
1173                 intvl.tv_sec = 0;
1174                 intvl.tv_nsec = 10000000;
1175         }
1176
1177         almost_done = 0;
1178         while (seenint == 0) {
1179                 struct timespec now, timeout;
1180                 struct msghdr m;
1181                 struct iovec iov[2];
1182                 fd_set rfds;
1183                 int n;
1184
1185                 /* signal handling */
1186                 if (seenint)
1187                         onint(SIGINT);
1188 #ifdef SIGINFO
1189                 if (seeninfo) {
1190                         summary();
1191                         seeninfo = 0;
1192                         continue;
1193                 }
1194 #endif
1195                 FD_ZERO(&rfds);
1196                 FD_SET(srecv, &rfds);
1197                 clock_gettime(CLOCK_MONOTONIC, &now);
1198                 timespecadd(&last, &intvl, &timeout);
1199                 timespecsub(&timeout, &now, &timeout);
1200                 if (timeout.tv_sec < 0)
1201                         timespecclear(&timeout);
1202
1203                 n = pselect(srecv + 1, &rfds, NULL, NULL, &timeout, NULL);
1204                 if (n < 0)
1205                         continue;       /* EINTR */
1206                 if (n == 1) {
1207                         m.msg_name = (caddr_t)&from;
1208                         m.msg_namelen = sizeof(from);
1209                         memset(&iov, 0, sizeof(iov));
1210                         iov[0].iov_base = (caddr_t)packet;
1211                         iov[0].iov_len = packlen;
1212                         m.msg_iov = iov;
1213                         m.msg_iovlen = 1;
1214                         memset(cm, 0, CONTROLLEN);
1215                         m.msg_control = (void *)cm;
1216                         m.msg_controllen = CONTROLLEN;
1217
1218                         cc = recvmsg(srecv, &m, 0);
1219                         if (cc < 0) {
1220                                 if (errno != EINTR) {
1221                                         warn("recvmsg");
1222                                         sleep(1);
1223                                 }
1224                                 continue;
1225                         } else if (cc == 0) {
1226                                 int mtu;
1227
1228                                 /*
1229                                  * receive control messages only. Process the
1230                                  * exceptions (currently the only possibility is
1231                                  * a path MTU notification.)
1232                                  */
1233                                 if ((mtu = get_pathmtu(&m)) > 0) {
1234                                         if ((options & F_VERBOSE) != 0) {
1235                                                 printf("new path MTU (%d) is "
1236                                                     "notified\n", mtu);
1237                                         }
1238                                 }
1239                                 continue;
1240                         } else {
1241                                 /*
1242                                  * an ICMPv6 message (probably an echoreply)
1243                                  * arrived.
1244                                  */
1245                                 pr_pack(packet, cc, &m);
1246                         }
1247                         if (((options & F_ONCE) != 0 && nreceived > 0) ||
1248                             (npackets > 0 && nreceived >= npackets))
1249                                 break;
1250                 }
1251                 if (n == 0 || (options & F_FLOOD)) {
1252                         if (npackets == 0 || ntransmitted < npackets)
1253                                 pinger();
1254                         else {
1255                                 if (almost_done)
1256                                         break;
1257                                 almost_done = 1;
1258                         /*
1259                          * If we're not transmitting any more packets,
1260                          * change the timer to wait two round-trip times
1261                          * if we've received any packets or (waittime)
1262                          * milliseconds if we haven't.
1263                          */
1264                                 intvl.tv_nsec = 0;
1265                                 if (nreceived) {
1266                                         intvl.tv_sec = 2 * tmax / 1000;
1267                                         if (intvl.tv_sec == 0)
1268                                                 intvl.tv_sec = 1;
1269                                 } else {
1270                                         intvl.tv_sec = waittime / 1000;
1271                                         intvl.tv_nsec =
1272                                                 waittime % 1000 * 1000000;
1273                                 }
1274                         }
1275                         clock_gettime(CLOCK_MONOTONIC, &last);
1276                         if (ntransmitted - nreceived - 1 > nmissedmax) {
1277                                 nmissedmax = ntransmitted - nreceived - 1;
1278                                 if (options & F_MISSED)
1279                                         (void)write(STDOUT_FILENO, &BBELL, 1);
1280                         }
1281                 }
1282         }
1283         sigemptyset(&si_sa.sa_mask);
1284         si_sa.sa_flags = 0;
1285         si_sa.sa_handler = SIG_IGN;
1286         sigaction(SIGINT, &si_sa, 0);
1287         sigaction(SIGALRM, &si_sa, 0);
1288         summary();
1289
1290         if(packet != NULL)
1291                 free(packet);
1292
1293         if (nreceived > 0)
1294                 exit(0);
1295         else if (ntransmitted > ntransmitfailures)
1296                 exit(2);
1297         else
1298                 exit(EX_OSERR);
1299 }
1300
1301 static void
1302 onsignal(int sig)
1303 {
1304
1305         switch (sig) {
1306         case SIGINT:
1307         case SIGALRM:
1308                 seenint++;
1309                 break;
1310 #ifdef SIGINFO
1311         case SIGINFO:
1312                 seeninfo++;
1313                 break;
1314 #endif
1315         }
1316 }
1317
1318 /*
1319  * pinger --
1320  *      Compose and transmit an ICMP ECHO REQUEST packet.  The IP packet
1321  * will be added on by the kernel.  The ID field is our UNIX process ID,
1322  * and the sequence number is an ascending integer.  The first 8 bytes
1323  * of the data portion are used to hold a UNIX "timespec" struct in VAX
1324  * byte-order, to compute the round-trip time.
1325  */
1326 static size_t
1327 pingerlen(void)
1328 {
1329         size_t l;
1330
1331         if (options & F_FQDN)
1332                 l = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1333         else if (options & F_FQDNOLD)
1334                 l = ICMP6_NIQLEN;
1335         else if (options & F_NODEADDR)
1336                 l = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1337         else if (options & F_SUPTYPES)
1338                 l = ICMP6_NIQLEN;
1339         else
1340                 l = ICMP6ECHOLEN + datalen;
1341
1342         return l;
1343 }
1344
1345 static int
1346 pinger(void)
1347 {
1348         struct icmp6_hdr *icp;
1349         struct iovec iov[2];
1350         int i, cc;
1351         struct icmp6_nodeinfo *nip;
1352         uint16_t seq;
1353
1354         if (npackets && ntransmitted >= npackets)
1355                 return(-1);     /* no more transmission */
1356
1357         icp = (struct icmp6_hdr *)outpack;
1358         nip = (struct icmp6_nodeinfo *)outpack;
1359         memset(icp, 0, sizeof(*icp));
1360         icp->icmp6_cksum = 0;
1361         seq = ntransmitted++;
1362         CLR(seq % mx_dup_ck);
1363
1364         if (options & F_FQDN) {
1365                 uint16_t s;
1366
1367                 icp->icmp6_type = ICMP6_NI_QUERY;
1368                 icp->icmp6_code = ICMP6_NI_SUBJ_IPV6;
1369                 nip->ni_qtype = htons(NI_QTYPE_FQDN);
1370                 nip->ni_flags = htons(0);
1371
1372                 memcpy(nip->icmp6_ni_nonce, nonce,
1373                     sizeof(nip->icmp6_ni_nonce));
1374                 s = htons(seq);
1375                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1376
1377                 memcpy(&outpack[ICMP6_NIQLEN], &dst.sin6_addr,
1378                     sizeof(dst.sin6_addr));
1379                 cc = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1380                 datalen = 0;
1381         } else if (options & F_FQDNOLD) {
1382                 uint16_t s;
1383                 /* packet format in 03 draft - no Subject data on queries */
1384                 icp->icmp6_type = ICMP6_NI_QUERY;
1385                 icp->icmp6_code = 0;    /* code field is always 0 */
1386                 nip->ni_qtype = htons(NI_QTYPE_FQDN);
1387                 nip->ni_flags = htons(0);
1388
1389                 memcpy(nip->icmp6_ni_nonce, nonce,
1390                     sizeof(nip->icmp6_ni_nonce));
1391                 s = htons(seq);
1392                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1393
1394                 cc = ICMP6_NIQLEN;
1395                 datalen = 0;
1396         } else if (options & F_NODEADDR) {
1397                 uint16_t s;
1398
1399                 icp->icmp6_type = ICMP6_NI_QUERY;
1400                 icp->icmp6_code = ICMP6_NI_SUBJ_IPV6;
1401                 nip->ni_qtype = htons(NI_QTYPE_NODEADDR);
1402                 nip->ni_flags = naflags;
1403
1404                 memcpy(nip->icmp6_ni_nonce, nonce,
1405                     sizeof(nip->icmp6_ni_nonce));
1406                 s = htons(seq);
1407                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1408
1409                 memcpy(&outpack[ICMP6_NIQLEN], &dst.sin6_addr,
1410                     sizeof(dst.sin6_addr));
1411                 cc = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1412                 datalen = 0;
1413         } else if (options & F_SUPTYPES) {
1414                 uint16_t s;
1415
1416                 icp->icmp6_type = ICMP6_NI_QUERY;
1417                 icp->icmp6_code = ICMP6_NI_SUBJ_FQDN;   /*empty*/
1418                 nip->ni_qtype = htons(NI_QTYPE_SUPTYPES);
1419                 /* we support compressed bitmap */
1420                 nip->ni_flags = NI_SUPTYPE_FLAG_COMPRESS;
1421
1422                 memcpy(nip->icmp6_ni_nonce, nonce,
1423                     sizeof(nip->icmp6_ni_nonce));
1424                 s = htons(seq);
1425                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1426
1427                 cc = ICMP6_NIQLEN;
1428                 datalen = 0;
1429         } else {
1430                 icp->icmp6_type = ICMP6_ECHO_REQUEST;
1431                 icp->icmp6_code = 0;
1432                 icp->icmp6_id = htons(ident);
1433                 icp->icmp6_seq = htons(seq);
1434                 if (timing) {
1435                         struct timespec tv;
1436                         struct tv32 tv32;
1437                         (void)clock_gettime(CLOCK_MONOTONIC, &tv);
1438                         /*
1439                          * Truncate seconds down to 32 bits in order
1440                          * to fit the timestamp within 8 bytes of the
1441                          * packet. We're only concerned with
1442                          * durations, not absolute times.
1443                          */
1444                         tv32.tv32_sec = (uint32_t)htonl(tv.tv_sec);
1445                         tv32.tv32_nsec = (uint32_t)htonl(tv.tv_nsec);
1446                         memcpy(&outpack[ICMP6ECHOLEN], &tv32, sizeof(tv32));
1447                 }
1448                 cc = ICMP6ECHOLEN + datalen;
1449         }
1450
1451 #ifdef DIAGNOSTIC
1452         if (pingerlen() != cc)
1453                 errx(1, "internal error; length mismatch");
1454 #endif
1455
1456         memset(&iov, 0, sizeof(iov));
1457         iov[0].iov_base = (caddr_t)outpack;
1458         iov[0].iov_len = cc;
1459         smsghdr.msg_iov = iov;
1460         smsghdr.msg_iovlen = 1;
1461
1462         i = sendmsg(ssend, &smsghdr, 0);
1463
1464         if (i < 0 || i != cc)  {
1465                 if (i < 0) {
1466                         ntransmitfailures++;
1467                         warn("sendmsg");
1468                 }
1469                 (void)printf("ping6: wrote %s %d chars, ret=%d\n",
1470                     hostname, cc, i);
1471         }
1472         if (!(options & F_QUIET) && options & F_FLOOD)
1473                 (void)write(STDOUT_FILENO, &DOT, 1);
1474
1475         return(0);
1476 }
1477
1478 static int
1479 myechoreply(const struct icmp6_hdr *icp)
1480 {
1481         if (ntohs(icp->icmp6_id) == ident)
1482                 return 1;
1483         else
1484                 return 0;
1485 }
1486
1487 static int
1488 mynireply(const struct icmp6_nodeinfo *nip)
1489 {
1490         if (memcmp(nip->icmp6_ni_nonce + sizeof(u_int16_t),
1491             nonce + sizeof(u_int16_t),
1492             sizeof(nonce) - sizeof(u_int16_t)) == 0)
1493                 return 1;
1494         else
1495                 return 0;
1496 }
1497
1498 /*
1499  * Decode a name from a DNS message.
1500  *
1501  * Format of the message is described in RFC 1035 subsection 4.1.4.
1502  *
1503  * Arguments:
1504  *   sp     - Pointer to a DNS pointer octet or to the first octet of a label
1505  *            in the message.
1506  *   ep     - Pointer to the end of the message (one step past the last octet).
1507  *   base   - Pointer to the beginning of the message.
1508  *   buf    - Buffer into which the decoded name will be saved.
1509  *   bufsiz - Size of the buffer 'buf'.
1510  *
1511  * Return value:
1512  *   Pointer to an octet immediately following the ending zero octet
1513  *   of the decoded label, or NULL if an error occured.
1514  */
1515 static const char *
1516 dnsdecode(const u_char *sp, const u_char *ep, const u_char *base, char *buf,
1517         size_t bufsiz)
1518 {
1519         int i;
1520         const u_char *cp;
1521         char cresult[MAXDNAME + 1];
1522         const u_char *comp;
1523         int l;
1524
1525         cp = sp;
1526         *buf = '\0';
1527
1528         if (cp >= ep)
1529                 return NULL;
1530         while (cp < ep) {
1531                 i = *cp;
1532                 if (i == 0 || cp != sp) {
1533                         if (strlcat((char *)buf, ".", bufsiz) >= bufsiz)
1534                                 return NULL;    /*result overrun*/
1535                 }
1536                 if (i == 0)
1537                         break;
1538                 cp++;
1539
1540                 if ((i & 0xc0) == 0xc0 && cp - base > (i & 0x3f)) {
1541                         /* DNS compression */
1542                         if (!base)
1543                                 return NULL;
1544
1545                         comp = base + (i & 0x3f);
1546                         if (dnsdecode(comp, cp, base, cresult,
1547                             sizeof(cresult)) == NULL)
1548                                 return NULL;
1549                         if (strlcat(buf, cresult, bufsiz) >= bufsiz)
1550                                 return NULL;    /*result overrun*/
1551                         break;
1552                 } else if ((i & 0x3f) == i) {
1553                         if (i > ep - cp)
1554                                 return NULL;    /*source overrun*/
1555                         while (i-- > 0 && cp < ep) {
1556                                 l = snprintf(cresult, sizeof(cresult),
1557                                     isprint(*cp) ? "%c" : "\\%03o", *cp & 0xff);
1558                                 if ((size_t)l >= sizeof(cresult) || l < 0)
1559                                         return NULL;
1560                                 if (strlcat(buf, cresult, bufsiz) >= bufsiz)
1561                                         return NULL;    /*result overrun*/
1562                                 cp++;
1563                         }
1564                 } else
1565                         return NULL;    /*invalid label*/
1566         }
1567         if (i != 0)
1568                 return NULL;    /*not terminated*/
1569         cp++;
1570         return cp;
1571 }
1572
1573 /*
1574  * pr_pack --
1575  *      Print out the packet, if it came from us.  This logic is necessary
1576  * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
1577  * which arrive ('tis only fair).  This permits multiple copies of this
1578  * program to be run without having intermingled output (or statistics!).
1579  */
1580 static void
1581 pr_pack(u_char *buf, int cc, struct msghdr *mhdr)
1582 {
1583 #define safeputc(c)     printf((isprint((c)) ? "%c" : "\\%03o"), c)
1584         struct icmp6_hdr *icp;
1585         struct icmp6_nodeinfo *ni;
1586         int i;
1587         int hoplim;
1588         struct sockaddr *from;
1589         int fromlen;
1590         const u_char *cp = NULL;
1591         u_char *dp, *end = buf + cc;
1592         struct in6_pktinfo *pktinfo = NULL;
1593         struct timespec tv, tp;
1594         struct tv32 tpp;
1595         double triptime = 0;
1596         int dupflag;
1597         size_t off;
1598         int oldfqdn;
1599         u_int16_t seq;
1600         char dnsname[MAXDNAME + 1];
1601
1602         (void)clock_gettime(CLOCK_MONOTONIC, &tv);
1603
1604         if (!mhdr || !mhdr->msg_name ||
1605             mhdr->msg_namelen != sizeof(struct sockaddr_in6) ||
1606             ((struct sockaddr *)mhdr->msg_name)->sa_family != AF_INET6) {
1607                 if (options & F_VERBOSE)
1608                         warnx("invalid peername");
1609                 return;
1610         }
1611         from = (struct sockaddr *)mhdr->msg_name;
1612         fromlen = mhdr->msg_namelen;
1613         if (cc < (int)sizeof(struct icmp6_hdr)) {
1614                 if (options & F_VERBOSE)
1615                         warnx("packet too short (%d bytes) from %s", cc,
1616                             pr_addr(from, fromlen));
1617                 return;
1618         }
1619         if (((mhdr->msg_flags & MSG_CTRUNC) != 0) &&
1620             (options & F_VERBOSE) != 0)
1621                 warnx("some control data discarded, insufficient buffer size");
1622         icp = (struct icmp6_hdr *)buf;
1623         ni = (struct icmp6_nodeinfo *)buf;
1624         off = 0;
1625
1626         if ((hoplim = get_hoplim(mhdr)) == -1) {
1627                 warnx("failed to get receiving hop limit");
1628                 return;
1629         }
1630         if ((pktinfo = get_rcvpktinfo(mhdr)) == NULL) {
1631                 warnx("failed to get receiving packet information");
1632                 return;
1633         }
1634
1635         if (icp->icmp6_type == ICMP6_ECHO_REPLY && myechoreply(icp)) {
1636                 seq = ntohs(icp->icmp6_seq);
1637                 ++nreceived;
1638                 if (timing) {
1639                         memcpy(&tpp, icp + 1, sizeof(tpp));
1640                         tp.tv_sec = ntohl(tpp.tv32_sec);
1641                         tp.tv_nsec = ntohl(tpp.tv32_nsec);
1642                         timespecsub(&tv, &tp, &tv);
1643                         triptime = ((double)tv.tv_sec) * 1000.0 +
1644                             ((double)tv.tv_nsec) / 1000000.0;
1645                         tsum += triptime;
1646                         tsumsq += triptime * triptime;
1647                         if (triptime < tmin)
1648                                 tmin = triptime;
1649                         if (triptime > tmax)
1650                                 tmax = triptime;
1651                 }
1652
1653                 if (TST(seq % mx_dup_ck)) {
1654                         ++nrepeats;
1655                         --nreceived;
1656                         dupflag = 1;
1657                 } else {
1658                         SET(seq % mx_dup_ck);
1659                         dupflag = 0;
1660                 }
1661
1662                 if (options & F_QUIET)
1663                         return;
1664
1665                 if (options & F_WAITTIME && triptime > waittime) {
1666                         ++nrcvtimeout;
1667                         return;
1668                 }
1669
1670                 if (options & F_FLOOD)
1671                         (void)write(STDOUT_FILENO, &BSPACE, 1);
1672                 else {
1673                         if (options & F_AUDIBLE)
1674                                 (void)write(STDOUT_FILENO, &BBELL, 1);
1675                         (void)printf("%d bytes from %s, icmp_seq=%u", cc,
1676                             pr_addr(from, fromlen), seq);
1677                         (void)printf(" hlim=%d", hoplim);
1678                         if ((options & F_VERBOSE) != 0) {
1679                                 struct sockaddr_in6 dstsa;
1680
1681                                 memset(&dstsa, 0, sizeof(dstsa));
1682                                 dstsa.sin6_family = AF_INET6;
1683                                 dstsa.sin6_len = sizeof(dstsa);
1684                                 dstsa.sin6_scope_id = pktinfo->ipi6_ifindex;
1685                                 dstsa.sin6_addr = pktinfo->ipi6_addr;
1686                                 (void)printf(" dst=%s",
1687                                     pr_addr((struct sockaddr *)&dstsa,
1688                                     sizeof(dstsa)));
1689                         }
1690                         if (timing)
1691                                 (void)printf(" time=%.3f ms", triptime);
1692                         if (dupflag)
1693                                 (void)printf("(DUP!)");
1694                         /* check the data */
1695                         cp = buf + off + ICMP6ECHOLEN + ICMP6ECHOTMLEN;
1696                         dp = outpack + ICMP6ECHOLEN + ICMP6ECHOTMLEN;
1697                         for (i = 8; cp < end; ++i, ++cp, ++dp) {
1698                                 if (*cp != *dp) {
1699                                         (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", i, *dp, *cp);
1700                                         break;
1701                                 }
1702                         }
1703                 }
1704         } else if (icp->icmp6_type == ICMP6_NI_REPLY && mynireply(ni)) {
1705                 memcpy(&seq, ni->icmp6_ni_nonce, sizeof(seq));
1706                 seq = ntohs(seq);
1707                 ++nreceived;
1708                 if (TST(seq % mx_dup_ck)) {
1709                         ++nrepeats;
1710                         --nreceived;
1711                         dupflag = 1;
1712                 } else {
1713                         SET(seq % mx_dup_ck);
1714                         dupflag = 0;
1715                 }
1716
1717                 if (options & F_QUIET)
1718                         return;
1719
1720                 (void)printf("%d bytes from %s: ", cc, pr_addr(from, fromlen));
1721
1722                 switch (ntohs(ni->ni_code)) {
1723                 case ICMP6_NI_SUCCESS:
1724                         break;
1725                 case ICMP6_NI_REFUSED:
1726                         printf("refused, type 0x%x", ntohs(ni->ni_type));
1727                         goto fqdnend;
1728                 case ICMP6_NI_UNKNOWN:
1729                         printf("unknown, type 0x%x", ntohs(ni->ni_type));
1730                         goto fqdnend;
1731                 default:
1732                         printf("unknown code 0x%x, type 0x%x",
1733                             ntohs(ni->ni_code), ntohs(ni->ni_type));
1734                         goto fqdnend;
1735                 }
1736
1737                 switch (ntohs(ni->ni_qtype)) {
1738                 case NI_QTYPE_NOOP:
1739                         printf("NodeInfo NOOP");
1740                         break;
1741                 case NI_QTYPE_SUPTYPES:
1742                         pr_suptypes(ni, end - (u_char *)ni);
1743                         break;
1744                 case NI_QTYPE_NODEADDR:
1745                         pr_nodeaddr(ni, end - (u_char *)ni);
1746                         break;
1747                 case NI_QTYPE_FQDN:
1748                 default:        /* XXX: for backward compatibility */
1749                         cp = (u_char *)ni + ICMP6_NIRLEN;
1750                         if (buf[off + ICMP6_NIRLEN] ==
1751                             cc - off - ICMP6_NIRLEN - 1)
1752                                 oldfqdn = 1;
1753                         else
1754                                 oldfqdn = 0;
1755                         if (oldfqdn) {
1756                                 cp++;   /* skip length */
1757                                 while (cp < end) {
1758                                         safeputc(*cp & 0xff);
1759                                         cp++;
1760                                 }
1761                         } else {
1762                                 i = 0;
1763                                 while (cp < end) {
1764                                         cp = dnsdecode((const u_char *)cp, end,
1765                                             (const u_char *)(ni + 1), dnsname,
1766                                             sizeof(dnsname));
1767                                         if (cp == NULL) {
1768                                                 printf("???");
1769                                                 break;
1770                                         }
1771                                         /*
1772                                          * name-lookup special handling for
1773                                          * truncated name
1774                                          */
1775                                         if (cp + 1 <= end && !*cp &&
1776                                             strlen(dnsname) > 0) {
1777                                                 dnsname[strlen(dnsname) - 1] = '\0';
1778                                                 cp++;
1779                                         }
1780                                         printf("%s%s", i > 0 ? "," : "",
1781                                             dnsname);
1782                                 }
1783                         }
1784                         if (options & F_VERBOSE) {
1785                                 u_long t;
1786                                 int32_t ttl;
1787                                 int comma = 0;
1788
1789                                 (void)printf(" (");     /*)*/
1790
1791                                 switch (ni->ni_code) {
1792                                 case ICMP6_NI_REFUSED:
1793                                         (void)printf("refused");
1794                                         comma++;
1795                                         break;
1796                                 case ICMP6_NI_UNKNOWN:
1797                                         (void)printf("unknown qtype");
1798                                         comma++;
1799                                         break;
1800                                 }
1801
1802                                 if ((end - (u_char *)ni) < ICMP6_NIRLEN) {
1803                                         /* case of refusion, unknown */
1804                                         /*(*/
1805                                         putchar(')');
1806                                         goto fqdnend;
1807                                 }
1808                                 memcpy(&t, &buf[off+ICMP6ECHOLEN+8], sizeof(t));
1809                                 ttl = (int32_t)ntohl(t);
1810                                 if (comma)
1811                                         printf(",");
1812                                 if (!(ni->ni_flags & NI_FQDN_FLAG_VALIDTTL)) {
1813                                         (void)printf("TTL=%d:meaningless",
1814                                             (int)ttl);
1815                                 } else {
1816                                         if (ttl < 0) {
1817                                                 (void)printf("TTL=%d:invalid",
1818                                                    ttl);
1819                                         } else
1820                                                 (void)printf("TTL=%d", ttl);
1821                                 }
1822                                 comma++;
1823
1824                                 if (oldfqdn) {
1825                                         if (comma)
1826                                                 printf(",");
1827                                         printf("03 draft");
1828                                         comma++;
1829                                 } else {
1830                                         cp = (u_char *)ni + ICMP6_NIRLEN;
1831                                         if (cp == end) {
1832                                                 if (comma)
1833                                                         printf(",");
1834                                                 printf("no name");
1835                                                 comma++;
1836                                         }
1837                                 }
1838
1839                                 if (buf[off + ICMP6_NIRLEN] !=
1840                                     cc - off - ICMP6_NIRLEN - 1 && oldfqdn) {
1841                                         if (comma)
1842                                                 printf(",");
1843                                         (void)printf("invalid namelen:%d/%lu",
1844                                             buf[off + ICMP6_NIRLEN],
1845                                             (u_long)cc - off - ICMP6_NIRLEN - 1);
1846                                         comma++;
1847                                 }
1848                                 /*(*/
1849                                 putchar(')');
1850                         }
1851                 fqdnend:
1852                         ;
1853                 }
1854         } else {
1855                 /* We've got something other than an ECHOREPLY */
1856                 if (!(options & F_VERBOSE))
1857                         return;
1858                 (void)printf("%d bytes from %s: ", cc, pr_addr(from, fromlen));
1859                 pr_icmph(icp, end);
1860         }
1861
1862         if (!(options & F_FLOOD)) {
1863                 (void)putchar('\n');
1864                 if (options & F_VERBOSE)
1865                         pr_exthdrs(mhdr);
1866                 (void)fflush(stdout);
1867         }
1868 #undef safeputc
1869 }
1870
1871 static void
1872 pr_exthdrs(struct msghdr *mhdr)
1873 {
1874         ssize_t bufsize;
1875         void    *bufp;
1876         struct cmsghdr *cm;
1877
1878         bufsize = 0;
1879         bufp = mhdr->msg_control;
1880         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1881              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1882                 if (cm->cmsg_level != IPPROTO_IPV6)
1883                         continue;
1884
1885                 bufsize = CONTROLLEN - ((caddr_t)CMSG_DATA(cm) - (caddr_t)bufp);
1886                 if (bufsize <= 0)
1887                         continue;
1888                 switch (cm->cmsg_type) {
1889                 case IPV6_HOPOPTS:
1890                         printf("  HbH Options: ");
1891                         pr_ip6opt(CMSG_DATA(cm), (size_t)bufsize);
1892                         break;
1893                 case IPV6_DSTOPTS:
1894 #ifdef IPV6_RTHDRDSTOPTS
1895                 case IPV6_RTHDRDSTOPTS:
1896 #endif
1897                         printf("  Dst Options: ");
1898                         pr_ip6opt(CMSG_DATA(cm), (size_t)bufsize);
1899                         break;
1900                 case IPV6_RTHDR:
1901                         printf("  Routing: ");
1902                         pr_rthdr(CMSG_DATA(cm), (size_t)bufsize);
1903                         break;
1904                 }
1905         }
1906 }
1907
1908 static void
1909 pr_ip6opt(void *extbuf, size_t bufsize)
1910 {
1911         struct ip6_hbh *ext;
1912         int currentlen;
1913         u_int8_t type;
1914         socklen_t extlen, len;
1915         void *databuf;
1916         size_t offset;
1917         u_int16_t value2;
1918         u_int32_t value4;
1919
1920         ext = (struct ip6_hbh *)extbuf;
1921         extlen = (ext->ip6h_len + 1) * 8;
1922         printf("nxt %u, len %u (%lu bytes)\n", ext->ip6h_nxt,
1923             (unsigned int)ext->ip6h_len, (unsigned long)extlen);
1924
1925         /*
1926          * Bounds checking on the ancillary data buffer:
1927          *     subtract the size of a cmsg structure from the buffer size.
1928          */
1929         if (bufsize < (extlen  + CMSG_SPACE(0))) {
1930                 extlen = bufsize - CMSG_SPACE(0);
1931                 warnx("options truncated, showing only %u (total=%u)",
1932                     (unsigned int)(extlen / 8 - 1),
1933                     (unsigned int)(ext->ip6h_len));
1934         }
1935
1936         currentlen = 0;
1937         while (1) {
1938                 currentlen = inet6_opt_next(extbuf, extlen, currentlen,
1939                     &type, &len, &databuf);
1940                 if (currentlen == -1)
1941                         break;
1942                 switch (type) {
1943                 /*
1944                  * Note that inet6_opt_next automatically skips any padding
1945                  * optins.
1946                  */
1947                 case IP6OPT_JUMBO:
1948                         offset = 0;
1949                         offset = inet6_opt_get_val(databuf, offset,
1950                             &value4, sizeof(value4));
1951                         printf("    Jumbo Payload Opt: Length %u\n",
1952                             (u_int32_t)ntohl(value4));
1953                         break;
1954                 case IP6OPT_ROUTER_ALERT:
1955                         offset = 0;
1956                         offset = inet6_opt_get_val(databuf, offset,
1957                                                    &value2, sizeof(value2));
1958                         printf("    Router Alert Opt: Type %u\n",
1959                             ntohs(value2));
1960                         break;
1961                 default:
1962                         printf("    Received Opt %u len %lu\n",
1963                             type, (unsigned long)len);
1964                         break;
1965                 }
1966         }
1967         return;
1968 }
1969
1970 static void
1971 pr_rthdr(void *extbuf, size_t bufsize)
1972 {
1973         struct in6_addr *in6;
1974         char ntopbuf[INET6_ADDRSTRLEN];
1975         struct ip6_rthdr *rh = (struct ip6_rthdr *)extbuf;
1976         int i, segments, origsegs, rthsize, size0, size1;
1977
1978         /* print fixed part of the header */
1979         printf("nxt %u, len %u (%d bytes), type %u, ", rh->ip6r_nxt,
1980             rh->ip6r_len, (rh->ip6r_len + 1) << 3, rh->ip6r_type);
1981         if ((segments = inet6_rth_segments(extbuf)) >= 0) {
1982                 printf("%d segments, ", segments);
1983                 printf("%d left\n", rh->ip6r_segleft);
1984         } else {
1985                 printf("segments unknown, ");
1986                 printf("%d left\n", rh->ip6r_segleft);
1987                 return;
1988         }
1989
1990         /*
1991          * Bounds checking on the ancillary data buffer. When calculating
1992          * the number of items to show keep in mind:
1993          *      - The size of the cmsg structure
1994          *      - The size of one segment (the size of a Type 0 routing header)
1995          *      - When dividing add a fudge factor of one in case the
1996          *        dividend is not evenly divisible by the divisor
1997          */
1998         rthsize = (rh->ip6r_len + 1) * 8;
1999         if (bufsize < (rthsize + CMSG_SPACE(0))) {
2000                 origsegs = segments;
2001                 size0 = inet6_rth_space(IPV6_RTHDR_TYPE_0, 0);
2002                 size1 = inet6_rth_space(IPV6_RTHDR_TYPE_0, 1);
2003                 segments -= (rthsize - (bufsize - CMSG_SPACE(0))) /
2004                     (size1 - size0) + 1;
2005                 warnx("segments truncated, showing only %d (total=%d)",
2006                     segments, origsegs);
2007         }
2008
2009         for (i = 0; i < segments; i++) {
2010                 in6 = inet6_rth_getaddr(extbuf, i);
2011                 if (in6 == NULL)
2012                         printf("   [%d]<NULL>\n", i);
2013                 else {
2014                         if (!inet_ntop(AF_INET6, in6, ntopbuf,
2015                             sizeof(ntopbuf)))
2016                                 strlcpy(ntopbuf, "?", sizeof(ntopbuf));
2017                         printf("   [%d]%s\n", i, ntopbuf);
2018                 }
2019         }
2020
2021         return;
2022
2023 }
2024
2025 static int
2026 pr_bitrange(u_int32_t v, int soff, int ii)
2027 {
2028         int off;
2029         int i;
2030
2031         off = 0;
2032         while (off < 32) {
2033                 /* shift till we have 0x01 */
2034                 if ((v & 0x01) == 0) {
2035                         if (ii > 1)
2036                                 printf("-%u", soff + off - 1);
2037                         ii = 0;
2038                         switch (v & 0x0f) {
2039                         case 0x00:
2040                                 v >>= 4;
2041                                 off += 4;
2042                                 continue;
2043                         case 0x08:
2044                                 v >>= 3;
2045                                 off += 3;
2046                                 continue;
2047                         case 0x04: case 0x0c:
2048                                 v >>= 2;
2049                                 off += 2;
2050                                 continue;
2051                         default:
2052                                 v >>= 1;
2053                                 off += 1;
2054                                 continue;
2055                         }
2056                 }
2057
2058                 /* we have 0x01 with us */
2059                 for (i = 0; i < 32 - off; i++) {
2060                         if ((v & (0x01 << i)) == 0)
2061                                 break;
2062                 }
2063                 if (!ii)
2064                         printf(" %u", soff + off);
2065                 ii += i;
2066                 v >>= i; off += i;
2067         }
2068         return ii;
2069 }
2070
2071 static void
2072 pr_suptypes(struct icmp6_nodeinfo *ni, size_t nilen)
2073         /* ni->qtype must be SUPTYPES */
2074 {
2075         size_t clen;
2076         u_int32_t v;
2077         const u_char *cp, *end;
2078         u_int16_t cur;
2079         struct cbit {
2080                 u_int16_t words;        /*32bit count*/
2081                 u_int16_t skip;
2082         } cbit;
2083 #define MAXQTYPES       (1 << 16)
2084         size_t off;
2085         int b;
2086
2087         cp = (u_char *)(ni + 1);
2088         end = ((u_char *)ni) + nilen;
2089         cur = 0;
2090         b = 0;
2091
2092         printf("NodeInfo Supported Qtypes");
2093         if (options & F_VERBOSE) {
2094                 if (ni->ni_flags & NI_SUPTYPE_FLAG_COMPRESS)
2095                         printf(", compressed bitmap");
2096                 else
2097                         printf(", raw bitmap");
2098         }
2099
2100         while (cp < end) {
2101                 clen = (size_t)(end - cp);
2102                 if ((ni->ni_flags & NI_SUPTYPE_FLAG_COMPRESS) == 0) {
2103                         if (clen == 0 || clen > MAXQTYPES / 8 ||
2104                             clen % sizeof(v)) {
2105                                 printf("???");
2106                                 return;
2107                         }
2108                 } else {
2109                         if (clen < sizeof(cbit) || clen % sizeof(v))
2110                                 return;
2111                         memcpy(&cbit, cp, sizeof(cbit));
2112                         if (sizeof(cbit) + ntohs(cbit.words) * sizeof(v) >
2113                             clen)
2114                                 return;
2115                         cp += sizeof(cbit);
2116                         clen = ntohs(cbit.words) * sizeof(v);
2117                         if (cur + clen * 8 + (u_long)ntohs(cbit.skip) * 32 >
2118                             MAXQTYPES)
2119                                 return;
2120                 }
2121
2122                 for (off = 0; off < clen; off += sizeof(v)) {
2123                         memcpy(&v, cp + off, sizeof(v));
2124                         v = (u_int32_t)ntohl(v);
2125                         b = pr_bitrange(v, (int)(cur + off * 8), b);
2126                 }
2127                 /* flush the remaining bits */
2128                 b = pr_bitrange(0, (int)(cur + off * 8), b);
2129
2130                 cp += clen;
2131                 cur += clen * 8;
2132                 if ((ni->ni_flags & NI_SUPTYPE_FLAG_COMPRESS) != 0)
2133                         cur += ntohs(cbit.skip) * 32;
2134         }
2135 }
2136
2137 static void
2138 pr_nodeaddr(struct icmp6_nodeinfo *ni, int nilen)
2139         /* ni->qtype must be NODEADDR */
2140 {
2141         u_char *cp = (u_char *)(ni + 1);
2142         char ntop_buf[INET6_ADDRSTRLEN];
2143         int withttl = 0;
2144
2145         nilen -= sizeof(struct icmp6_nodeinfo);
2146
2147         if (options & F_VERBOSE) {
2148                 switch (ni->ni_code) {
2149                 case ICMP6_NI_REFUSED:
2150                         (void)printf("refused");
2151                         break;
2152                 case ICMP6_NI_UNKNOWN:
2153                         (void)printf("unknown qtype");
2154                         break;
2155                 }
2156                 if (ni->ni_flags & NI_NODEADDR_FLAG_TRUNCATE)
2157                         (void)printf(" truncated");
2158         }
2159         putchar('\n');
2160         if (nilen <= 0)
2161                 printf("  no address\n");
2162
2163         /*
2164          * In icmp-name-lookups 05 and later, TTL of each returned address
2165          * is contained in the resposne. We try to detect the version
2166          * by the length of the data, but note that the detection algorithm
2167          * is incomplete. We assume the latest draft by default.
2168          */
2169         if (nilen % (sizeof(u_int32_t) + sizeof(struct in6_addr)) == 0)
2170                 withttl = 1;
2171         while (nilen > 0) {
2172                 u_int32_t ttl = 0;
2173
2174                 if (withttl) {
2175                         uint32_t t;
2176
2177                         memcpy(&t, cp, sizeof(t));
2178                         ttl = (u_int32_t)ntohl(t);
2179                         cp += sizeof(u_int32_t);
2180                         nilen -= sizeof(u_int32_t);
2181                 }
2182
2183                 if (inet_ntop(AF_INET6, cp, ntop_buf, sizeof(ntop_buf)) ==
2184                     NULL)
2185                         strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2186                 printf("  %s", ntop_buf);
2187                 if (withttl) {
2188                         if (ttl == 0xffffffff) {
2189                                 /*
2190                                  * XXX: can this convention be applied to all
2191                                  * type of TTL (i.e. non-ND TTL)?
2192                                  */
2193                                 printf("(TTL=infty)");
2194                         }
2195                         else
2196                                 printf("(TTL=%u)", ttl);
2197                 }
2198                 putchar('\n');
2199
2200                 nilen -= sizeof(struct in6_addr);
2201                 cp += sizeof(struct in6_addr);
2202         }
2203 }
2204
2205 static int
2206 get_hoplim(struct msghdr *mhdr)
2207 {
2208         struct cmsghdr *cm;
2209
2210         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
2211              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
2212                 if (cm->cmsg_len == 0)
2213                         return(-1);
2214
2215                 if (cm->cmsg_level == IPPROTO_IPV6 &&
2216                     cm->cmsg_type == IPV6_HOPLIMIT &&
2217                     cm->cmsg_len == CMSG_LEN(sizeof(int))) {
2218                         int r;
2219
2220                         memcpy(&r, CMSG_DATA(cm), sizeof(r));
2221                         return(r);
2222                 }
2223         }
2224
2225         return(-1);
2226 }
2227
2228 static struct in6_pktinfo *
2229 get_rcvpktinfo(struct msghdr *mhdr)
2230 {
2231         static struct in6_pktinfo pi;
2232         struct cmsghdr *cm;
2233
2234         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
2235              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
2236                 if (cm->cmsg_len == 0)
2237                         return(NULL);
2238
2239                 if (cm->cmsg_level == IPPROTO_IPV6 &&
2240                     cm->cmsg_type == IPV6_PKTINFO &&
2241                     cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
2242                         memcpy(&pi, CMSG_DATA(cm), sizeof(pi));
2243                         return(&pi);
2244                 }
2245         }
2246
2247         return(NULL);
2248 }
2249
2250 static int
2251 get_pathmtu(struct msghdr *mhdr)
2252 {
2253 #ifdef IPV6_RECVPATHMTU
2254         struct cmsghdr *cm;
2255         struct ip6_mtuinfo mtuctl;
2256
2257         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
2258              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
2259                 if (cm->cmsg_len == 0)
2260                         return(0);
2261
2262                 if (cm->cmsg_level == IPPROTO_IPV6 &&
2263                     cm->cmsg_type == IPV6_PATHMTU &&
2264                     cm->cmsg_len == CMSG_LEN(sizeof(struct ip6_mtuinfo))) {
2265                         memcpy(&mtuctl, CMSG_DATA(cm), sizeof(mtuctl));
2266
2267                         /*
2268                          * If the notified destination is different from
2269                          * the one we are pinging, just ignore the info.
2270                          * We check the scope ID only when both notified value
2271                          * and our own value have non-0 values, because we may
2272                          * have used the default scope zone ID for sending,
2273                          * in which case the scope ID value is 0.
2274                          */
2275                         if (!IN6_ARE_ADDR_EQUAL(&mtuctl.ip6m_addr.sin6_addr,
2276                                                 &dst.sin6_addr) ||
2277                             (mtuctl.ip6m_addr.sin6_scope_id &&
2278                              dst.sin6_scope_id &&
2279                              mtuctl.ip6m_addr.sin6_scope_id !=
2280                              dst.sin6_scope_id)) {
2281                                 if ((options & F_VERBOSE) != 0) {
2282                                         printf("path MTU for %s is notified. "
2283                                                "(ignored)\n",
2284                                            pr_addr((struct sockaddr *)&mtuctl.ip6m_addr,
2285                                            sizeof(mtuctl.ip6m_addr)));
2286                                 }
2287                                 return(0);
2288                         }
2289
2290                         /*
2291                          * Ignore an invalid MTU. XXX: can we just believe
2292                          * the kernel check?
2293                          */
2294                         if (mtuctl.ip6m_mtu < IPV6_MMTU)
2295                                 return(0);
2296
2297                         /* notification for our destination. return the MTU. */
2298                         return((int)mtuctl.ip6m_mtu);
2299                 }
2300         }
2301 #endif
2302         return(0);
2303 }
2304
2305 /*
2306  * onint --
2307  *      SIGINT handler.
2308  */
2309 /* ARGSUSED */
2310 static void
2311 onint(int notused __unused)
2312 {
2313         /*
2314          * When doing reverse DNS lookups, the seenint flag might not
2315          * be noticed for a while.  Just exit if we get a second SIGINT.
2316          */
2317         if ((options & F_HOSTNAME) && seenint != 0)
2318                 _exit(nreceived ? 0 : 2);
2319 }
2320
2321 /*
2322  * summary --
2323  *      Print out statistics.
2324  */
2325 static void
2326 summary(void)
2327 {
2328
2329         (void)printf("\n--- %s ping6 statistics ---\n", hostname);
2330         (void)printf("%ld packets transmitted, ", ntransmitted);
2331         (void)printf("%ld packets received, ", nreceived);
2332         if (nrepeats)
2333                 (void)printf("+%ld duplicates, ", nrepeats);
2334         if (ntransmitted) {
2335                 if (nreceived > ntransmitted)
2336                         (void)printf("-- somebody's duplicating packets!");
2337                 else
2338                         (void)printf("%.1f%% packet loss",
2339                             ((((double)ntransmitted - nreceived) * 100.0) /
2340                             ntransmitted));
2341         }
2342         if (nrcvtimeout)
2343                 printf(", %ld packets out of wait time", nrcvtimeout);
2344         (void)putchar('\n');
2345         if (nreceived && timing) {
2346                 /* Only display average to microseconds */
2347                 double num = nreceived + nrepeats;
2348                 double avg = tsum / num;
2349                 double dev = sqrt(tsumsq / num - avg * avg);
2350                 (void)printf(
2351                     "round-trip min/avg/max/std-dev = %.3f/%.3f/%.3f/%.3f ms\n",
2352                     tmin, avg, tmax, dev);
2353                 (void)fflush(stdout);
2354         }
2355         (void)fflush(stdout);
2356 }
2357
2358 /*subject type*/
2359 static const char *niqcode[] = {
2360         "IPv6 address",
2361         "DNS label",    /*or empty*/
2362         "IPv4 address",
2363 };
2364
2365 /*result code*/
2366 static const char *nircode[] = {
2367         "Success", "Refused", "Unknown",
2368 };
2369
2370
2371 /*
2372  * pr_icmph --
2373  *      Print a descriptive string about an ICMP header.
2374  */
2375 static void
2376 pr_icmph(struct icmp6_hdr *icp, u_char *end)
2377 {
2378         char ntop_buf[INET6_ADDRSTRLEN];
2379         struct nd_redirect *red;
2380         struct icmp6_nodeinfo *ni;
2381         char dnsname[MAXDNAME + 1];
2382         const u_char *cp;
2383         size_t l;
2384
2385         switch (icp->icmp6_type) {
2386         case ICMP6_DST_UNREACH:
2387                 switch (icp->icmp6_code) {
2388                 case ICMP6_DST_UNREACH_NOROUTE:
2389                         (void)printf("No Route to Destination\n");
2390                         break;
2391                 case ICMP6_DST_UNREACH_ADMIN:
2392                         (void)printf("Destination Administratively "
2393                             "Unreachable\n");
2394                         break;
2395                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
2396                         (void)printf("Destination Unreachable Beyond Scope\n");
2397                         break;
2398                 case ICMP6_DST_UNREACH_ADDR:
2399                         (void)printf("Destination Host Unreachable\n");
2400                         break;
2401                 case ICMP6_DST_UNREACH_NOPORT:
2402                         (void)printf("Destination Port Unreachable\n");
2403                         break;
2404                 default:
2405                         (void)printf("Destination Unreachable, Bad Code: %d\n",
2406                             icp->icmp6_code);
2407                         break;
2408                 }
2409                 /* Print returned IP header information */
2410                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2411                 break;
2412         case ICMP6_PACKET_TOO_BIG:
2413                 (void)printf("Packet too big mtu = %d\n",
2414                     (int)ntohl(icp->icmp6_mtu));
2415                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2416                 break;
2417         case ICMP6_TIME_EXCEEDED:
2418                 switch (icp->icmp6_code) {
2419                 case ICMP6_TIME_EXCEED_TRANSIT:
2420                         (void)printf("Time to live exceeded\n");
2421                         break;
2422                 case ICMP6_TIME_EXCEED_REASSEMBLY:
2423                         (void)printf("Frag reassembly time exceeded\n");
2424                         break;
2425                 default:
2426                         (void)printf("Time exceeded, Bad Code: %d\n",
2427                             icp->icmp6_code);
2428                         break;
2429                 }
2430                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2431                 break;
2432         case ICMP6_PARAM_PROB:
2433                 (void)printf("Parameter problem: ");
2434                 switch (icp->icmp6_code) {
2435                 case ICMP6_PARAMPROB_HEADER:
2436                         (void)printf("Erroneous Header ");
2437                         break;
2438                 case ICMP6_PARAMPROB_NEXTHEADER:
2439                         (void)printf("Unknown Nextheader ");
2440                         break;
2441                 case ICMP6_PARAMPROB_OPTION:
2442                         (void)printf("Unrecognized Option ");
2443                         break;
2444                 default:
2445                         (void)printf("Bad code(%d) ", icp->icmp6_code);
2446                         break;
2447                 }
2448                 (void)printf("pointer = 0x%02x\n",
2449                     (u_int32_t)ntohl(icp->icmp6_pptr));
2450                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2451                 break;
2452         case ICMP6_ECHO_REQUEST:
2453                 (void)printf("Echo Request");
2454                 /* XXX ID + Seq + Data */
2455                 break;
2456         case ICMP6_ECHO_REPLY:
2457                 (void)printf("Echo Reply");
2458                 /* XXX ID + Seq + Data */
2459                 break;
2460         case ICMP6_MEMBERSHIP_QUERY:
2461                 (void)printf("Listener Query");
2462                 break;
2463         case ICMP6_MEMBERSHIP_REPORT:
2464                 (void)printf("Listener Report");
2465                 break;
2466         case ICMP6_MEMBERSHIP_REDUCTION:
2467                 (void)printf("Listener Done");
2468                 break;
2469         case ND_ROUTER_SOLICIT:
2470                 (void)printf("Router Solicitation");
2471                 break;
2472         case ND_ROUTER_ADVERT:
2473                 (void)printf("Router Advertisement");
2474                 break;
2475         case ND_NEIGHBOR_SOLICIT:
2476                 (void)printf("Neighbor Solicitation");
2477                 break;
2478         case ND_NEIGHBOR_ADVERT:
2479                 (void)printf("Neighbor Advertisement");
2480                 break;
2481         case ND_REDIRECT:
2482                 red = (struct nd_redirect *)icp;
2483                 (void)printf("Redirect\n");
2484                 if (!inet_ntop(AF_INET6, &red->nd_rd_dst, ntop_buf,
2485                     sizeof(ntop_buf)))
2486                         strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2487                 (void)printf("Destination: %s", ntop_buf);
2488                 if (!inet_ntop(AF_INET6, &red->nd_rd_target, ntop_buf,
2489                     sizeof(ntop_buf)))
2490                         strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2491                 (void)printf(" New Target: %s", ntop_buf);
2492                 break;
2493         case ICMP6_NI_QUERY:
2494                 (void)printf("Node Information Query");
2495                 /* XXX ID + Seq + Data */
2496                 ni = (struct icmp6_nodeinfo *)icp;
2497                 l = end - (u_char *)(ni + 1);
2498                 printf(", ");
2499                 switch (ntohs(ni->ni_qtype)) {
2500                 case NI_QTYPE_NOOP:
2501                         (void)printf("NOOP");
2502                         break;
2503                 case NI_QTYPE_SUPTYPES:
2504                         (void)printf("Supported qtypes");
2505                         break;
2506                 case NI_QTYPE_FQDN:
2507                         (void)printf("DNS name");
2508                         break;
2509                 case NI_QTYPE_NODEADDR:
2510                         (void)printf("nodeaddr");
2511                         break;
2512                 case NI_QTYPE_IPV4ADDR:
2513                         (void)printf("IPv4 nodeaddr");
2514                         break;
2515                 default:
2516                         (void)printf("unknown qtype");
2517                         break;
2518                 }
2519                 if (options & F_VERBOSE) {
2520                         switch (ni->ni_code) {
2521                         case ICMP6_NI_SUBJ_IPV6:
2522                                 if (l == sizeof(struct in6_addr) &&
2523                                     inet_ntop(AF_INET6, ni + 1, ntop_buf,
2524                                     sizeof(ntop_buf)) != NULL) {
2525                                         (void)printf(", subject=%s(%s)",
2526                                             niqcode[ni->ni_code], ntop_buf);
2527                                 } else {
2528 #if 1
2529                                         /* backward compat to -W */
2530                                         (void)printf(", oldfqdn");
2531 #else
2532                                         (void)printf(", invalid");
2533 #endif
2534                                 }
2535                                 break;
2536                         case ICMP6_NI_SUBJ_FQDN:
2537                                 if (end == (u_char *)(ni + 1)) {
2538                                         (void)printf(", no subject");
2539                                         break;
2540                                 }
2541                                 printf(", subject=%s", niqcode[ni->ni_code]);
2542                                 cp = (const u_char *)(ni + 1);
2543                                 cp = dnsdecode(cp, end, NULL, dnsname,
2544                                     sizeof(dnsname));
2545                                 if (cp != NULL)
2546                                         printf("(%s)", dnsname);
2547                                 else
2548                                         printf("(invalid)");
2549                                 break;
2550                         case ICMP6_NI_SUBJ_IPV4:
2551                                 if (l == sizeof(struct in_addr) &&
2552                                     inet_ntop(AF_INET, ni + 1, ntop_buf,
2553                                     sizeof(ntop_buf)) != NULL) {
2554                                         (void)printf(", subject=%s(%s)",
2555                                             niqcode[ni->ni_code], ntop_buf);
2556                                 } else
2557                                         (void)printf(", invalid");
2558                                 break;
2559                         default:
2560                                 (void)printf(", invalid");
2561                                 break;
2562                         }
2563                 }
2564                 break;
2565         case ICMP6_NI_REPLY:
2566                 (void)printf("Node Information Reply");
2567                 /* XXX ID + Seq + Data */
2568                 ni = (struct icmp6_nodeinfo *)icp;
2569                 printf(", ");
2570                 switch (ntohs(ni->ni_qtype)) {
2571                 case NI_QTYPE_NOOP:
2572                         (void)printf("NOOP");
2573                         break;
2574                 case NI_QTYPE_SUPTYPES:
2575                         (void)printf("Supported qtypes");
2576                         break;
2577                 case NI_QTYPE_FQDN:
2578                         (void)printf("DNS name");
2579                         break;
2580                 case NI_QTYPE_NODEADDR:
2581                         (void)printf("nodeaddr");
2582                         break;
2583                 case NI_QTYPE_IPV4ADDR:
2584                         (void)printf("IPv4 nodeaddr");
2585                         break;
2586                 default:
2587                         (void)printf("unknown qtype");
2588                         break;
2589                 }
2590                 if (options & F_VERBOSE) {
2591                         if (ni->ni_code > nitems(nircode))
2592                                 printf(", invalid");
2593                         else
2594                                 printf(", %s", nircode[ni->ni_code]);
2595                 }
2596                 break;
2597         default:
2598                 (void)printf("Bad ICMP type: %d", icp->icmp6_type);
2599         }
2600 }
2601
2602 /*
2603  * pr_iph --
2604  *      Print an IP6 header.
2605  */
2606 static void
2607 pr_iph(struct ip6_hdr *ip6)
2608 {
2609         u_int32_t flow = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
2610         u_int8_t tc;
2611         char ntop_buf[INET6_ADDRSTRLEN];
2612
2613         tc = *(&ip6->ip6_vfc + 1); /* XXX */
2614         tc = (tc >> 4) & 0x0f;
2615         tc |= (ip6->ip6_vfc << 4);
2616
2617         printf("Vr TC  Flow Plen Nxt Hlim\n");
2618         printf(" %1x %02x %05x %04x  %02x   %02x\n",
2619             (ip6->ip6_vfc & IPV6_VERSION_MASK) >> 4, tc, (u_int32_t)ntohl(flow),
2620             ntohs(ip6->ip6_plen), ip6->ip6_nxt, ip6->ip6_hlim);
2621         if (!inet_ntop(AF_INET6, &ip6->ip6_src, ntop_buf, sizeof(ntop_buf)))
2622                 strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2623         printf("%s->", ntop_buf);
2624         if (!inet_ntop(AF_INET6, &ip6->ip6_dst, ntop_buf, sizeof(ntop_buf)))
2625                 strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2626         printf("%s\n", ntop_buf);
2627 }
2628
2629 /*
2630  * pr_addr --
2631  *      Return an ascii host address as a dotted quad and optionally with
2632  * a hostname.
2633  */
2634 static const char *
2635 pr_addr(struct sockaddr *addr, int addrlen)
2636 {
2637         static char buf[NI_MAXHOST];
2638         int flag = 0;
2639
2640         if ((options & F_HOSTNAME) == 0)
2641                 flag |= NI_NUMERICHOST;
2642
2643         if (cap_getnameinfo(capdns, addr, addrlen, buf, sizeof(buf), NULL, 0,
2644                 flag) == 0)
2645                 return (buf);
2646         else
2647                 return "?";
2648 }
2649
2650 /*
2651  * pr_retip --
2652  *      Dump some info on a returned (via ICMPv6) IPv6 packet.
2653  */
2654 static void
2655 pr_retip(struct ip6_hdr *ip6, u_char *end)
2656 {
2657         u_char *cp = (u_char *)ip6, nh;
2658         int hlen;
2659
2660         if ((size_t)(end - (u_char *)ip6) < sizeof(*ip6)) {
2661                 printf("IP6");
2662                 goto trunc;
2663         }
2664         pr_iph(ip6);
2665         hlen = sizeof(*ip6);
2666
2667         nh = ip6->ip6_nxt;
2668         cp += hlen;
2669         while (end - cp >= 8) {
2670                 struct ah ah;
2671
2672                 switch (nh) {
2673                 case IPPROTO_HOPOPTS:
2674                         printf("HBH ");
2675                         hlen = (((struct ip6_hbh *)cp)->ip6h_len+1) << 3;
2676                         nh = ((struct ip6_hbh *)cp)->ip6h_nxt;
2677                         break;
2678                 case IPPROTO_DSTOPTS:
2679                         printf("DSTOPT ");
2680                         hlen = (((struct ip6_dest *)cp)->ip6d_len+1) << 3;
2681                         nh = ((struct ip6_dest *)cp)->ip6d_nxt;
2682                         break;
2683                 case IPPROTO_FRAGMENT:
2684                         printf("FRAG ");
2685                         hlen = sizeof(struct ip6_frag);
2686                         nh = ((struct ip6_frag *)cp)->ip6f_nxt;
2687                         break;
2688                 case IPPROTO_ROUTING:
2689                         printf("RTHDR ");
2690                         hlen = (((struct ip6_rthdr *)cp)->ip6r_len+1) << 3;
2691                         nh = ((struct ip6_rthdr *)cp)->ip6r_nxt;
2692                         break;
2693 #ifdef IPSEC
2694                 case IPPROTO_AH:
2695                         printf("AH ");
2696                         memcpy(&ah, cp, sizeof(ah));
2697                         hlen = (ah.ah_len+2) << 2;
2698                         nh = ah.ah_nxt;
2699                         break;
2700 #endif
2701                 case IPPROTO_ICMPV6:
2702                         printf("ICMP6: type = %d, code = %d\n",
2703                             *cp, *(cp + 1));
2704                         return;
2705                 case IPPROTO_ESP:
2706                         printf("ESP\n");
2707                         return;
2708                 case IPPROTO_TCP:
2709                         printf("TCP: from port %u, to port %u (decimal)\n",
2710                             (*cp * 256 + *(cp + 1)),
2711                             (*(cp + 2) * 256 + *(cp + 3)));
2712                         return;
2713                 case IPPROTO_UDP:
2714                         printf("UDP: from port %u, to port %u (decimal)\n",
2715                             (*cp * 256 + *(cp + 1)),
2716                             (*(cp + 2) * 256 + *(cp + 3)));
2717                         return;
2718                 default:
2719                         printf("Unknown Header(%d)\n", nh);
2720                         return;
2721                 }
2722
2723                 if ((cp += hlen) >= end)
2724                         goto trunc;
2725         }
2726         if (end - cp < 8)
2727                 goto trunc;
2728
2729         putchar('\n');
2730         return;
2731
2732   trunc:
2733         printf("...\n");
2734         return;
2735 }
2736
2737 static void
2738 fill(char *bp, char *patp)
2739 {
2740         int ii, jj, kk;
2741         int pat[16];
2742         char *cp;
2743
2744         for (cp = patp; *cp; cp++)
2745                 if (!isxdigit(*cp))
2746                         errx(1, "patterns must be specified as hex digits");
2747         ii = sscanf(patp,
2748             "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
2749             &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
2750             &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
2751             &pat[13], &pat[14], &pat[15]);
2752
2753 /* xxx */
2754         if (ii > 0)
2755                 for (kk = 0;
2756                     (size_t)kk <= MAXDATALEN - 8 + sizeof(struct tv32) + ii;
2757                     kk += ii)
2758                         for (jj = 0; jj < ii; ++jj)
2759                                 bp[jj + kk] = pat[jj];
2760         if (!(options & F_QUIET)) {
2761                 (void)printf("PATTERN: 0x");
2762                 for (jj = 0; jj < ii; ++jj)
2763                         (void)printf("%02x", bp[jj] & 0xFF);
2764                 (void)printf("\n");
2765         }
2766 }
2767
2768 #ifdef IPSEC
2769 #ifdef IPSEC_POLICY_IPSEC
2770 static int
2771 setpolicy(int so __unused, char *policy)
2772 {
2773         char *buf;
2774
2775         if (policy == NULL)
2776                 return 0;       /* ignore */
2777
2778         buf = ipsec_set_policy(policy, strlen(policy));
2779         if (buf == NULL)
2780                 errx(1, "%s", ipsec_strerror());
2781         if (setsockopt(ssend, IPPROTO_IPV6, IPV6_IPSEC_POLICY, buf,
2782             ipsec_get_policylen(buf)) < 0)
2783                 warnx("Unable to set IPsec policy");
2784         free(buf);
2785
2786         return 0;
2787 }
2788 #endif
2789 #endif
2790
2791 static char *
2792 nigroup(char *name, int nig_oldmcprefix)
2793 {
2794         char *p;
2795         char *q;
2796         MD5_CTX ctxt;
2797         u_int8_t digest[16];
2798         u_int8_t c;
2799         size_t l;
2800         char hbuf[NI_MAXHOST];
2801         struct in6_addr in6;
2802         int valid;
2803
2804         p = strchr(name, '.');
2805         if (!p)
2806                 p = name + strlen(name);
2807         l = p - name;
2808         if (l > 63 || l > sizeof(hbuf) - 1)
2809                 return NULL;    /*label too long*/
2810         strncpy(hbuf, name, l);
2811         hbuf[(int)l] = '\0';
2812
2813         for (q = name; *q; q++) {
2814                 if (isupper(*(unsigned char *)q))
2815                         *q = tolower(*(unsigned char *)q);
2816         }
2817
2818         /* generate 16 bytes of pseudo-random value. */
2819         memset(&ctxt, 0, sizeof(ctxt));
2820         MD5Init(&ctxt);
2821         c = l & 0xff;
2822         MD5Update(&ctxt, &c, sizeof(c));
2823         MD5Update(&ctxt, (unsigned char *)name, l);
2824         MD5Final(digest, &ctxt);
2825
2826         if (nig_oldmcprefix) {
2827                 /* draft-ietf-ipngwg-icmp-name-lookup */
2828                 valid = inet_pton(AF_INET6, "ff02::2:0000:0000", &in6);
2829         } else {
2830                 /* RFC 4620 */
2831                 valid = inet_pton(AF_INET6, "ff02::2:ff00:0000", &in6);
2832         }
2833         if (valid != 1)
2834                 return NULL;    /*XXX*/
2835
2836         if (nig_oldmcprefix) {
2837                 /* draft-ietf-ipngwg-icmp-name-lookup */
2838                 bcopy(digest, &in6.s6_addr[12], 4);
2839         } else {
2840                 /* RFC 4620 */
2841                 bcopy(digest, &in6.s6_addr[13], 3);
2842         }
2843
2844         if (inet_ntop(AF_INET6, &in6, hbuf, sizeof(hbuf)) == NULL)
2845                 return NULL;
2846
2847         return strdup(hbuf);
2848 }
2849
2850 static cap_channel_t *
2851 capdns_setup(void)
2852 {
2853         cap_channel_t *capcas, *capdnsloc;
2854 #ifdef WITH_CASPER
2855         const char *types[2];
2856         int families[1];
2857 #endif
2858         capcas = cap_init();
2859         if (capcas == NULL)
2860                 err(1, "unable to create casper process");
2861         capdnsloc = cap_service_open(capcas, "system.dns");
2862         /* Casper capability no longer needed. */
2863         cap_close(capcas);
2864         if (capdnsloc == NULL)
2865                 err(1, "unable to open system.dns service");
2866 #ifdef WITH_CASPER
2867         types[0] = "NAME2ADDR";
2868         types[1] = "ADDR2NAME";
2869         if (cap_dns_type_limit(capdnsloc, types, nitems(types)) < 0)
2870                 err(1, "unable to limit access to system.dns service");
2871         families[0] = AF_INET6;
2872         if (cap_dns_family_limit(capdnsloc, families, nitems(families)) < 0)
2873                 err(1, "unable to limit access to system.dns service");
2874 #endif
2875         return (capdnsloc);
2876 }