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 #ifdef IPSEC
 297 #ifdef IPSEC_POLICY_IPSEC
 298 static int       setpolicy(int, char *);
 299 #endif
 300 #endif
 301 static char     *nigroup(char *, int);
 302
 303 int
 304 ping6(int argc, char *argv[])
 305 {
 306         struct timespec last, intvl;
 307         struct sockaddr_in6 from, *sin6;
 308         struct addrinfo hints, *res;
 309         struct sigaction si_sa;
 310         int cc, i;
 311         int almost_done, ch, hold, packlen, preload, optval, error;
 312         int nig_oldmcprefix = -1;
 313         u_char *datap;
 314         char *e, *target, *ifname = NULL, *gateway = NULL;
 315         int ip6optlen = 0;
 316         struct cmsghdr *scmsgp = NULL;
 317         /* For control (ancillary) data received from recvmsg() */
 318         u_char cm[CONTROLLEN];
 319 #if defined(SO_SNDBUF) && defined(SO_RCVBUF)
 320         u_long lsockbufsize;
 321         int sockbufsize = 0;
 322 #endif
 323         int usepktinfo = 0;
 324         struct in6_pktinfo pktinfo;
 325         char *cmsg_pktinfo = NULL;
 326         struct ip6_rthdr *rthdr = NULL;
 327 #ifdef IPSEC_POLICY_IPSEC
 328         char *policy_in = NULL;
 329         char *policy_out = NULL;
 330 #endif
 331         double t;
 332         u_long alarmtimeout;
 333         size_t rthlen;
 334 #ifdef IPV6_USE_MIN_MTU
 335         int mflag = 0;
 336 #endif
 337         cap_rights_t rights_srecv;
 338         cap_rights_t rights_ssend;
 339         cap_rights_t rights_stdin;
 340
 341         /* just to be sure */
 342         memset(&smsghdr, 0, sizeof(smsghdr));
 343         memset(&smsgiov, 0, sizeof(smsgiov));
 344         memset(&pktinfo, 0, sizeof(pktinfo));
 345
 346         intvl.tv_sec = interval / 1000;
 347         intvl.tv_nsec = interval % 1000 * 1000000;
 348
 349         alarmtimeout = preload = 0;
 350         datap = &outpack[ICMP6ECHOLEN + ICMP6ECHOTMLEN];
 351         capdns = capdns_setup();
 352
 353         while ((ch = getopt(argc, argv, PING6OPTS)) != -1) {
 354                 switch (ch) {
 355                 case '6':
 356                         /* This option is processed in main(). */
 357                         break;
 358                 case 'k':
 359                 {
 360                         char *cp;
 361
 362                         options &= ~F_NOUSERDATA;
 363                         options |= F_NODEADDR;
 364                         for (cp = optarg; *cp != '\0'; cp++) {
 365                                 switch (*cp) {
 366                                 case 'a':
 367                                         naflags |= NI_NODEADDR_FLAG_ALL;
 368                                         break;
 369                                 case 'c':
 370                                 case 'C':
 371                                         naflags |= NI_NODEADDR_FLAG_COMPAT;
 372                                         break;
 373                                 case 'l':
 374                                 case 'L':
 375                                         naflags |= NI_NODEADDR_FLAG_LINKLOCAL;
 376                                         break;
 377                                 case 's':
 378                                 case 'S':
 379                                         naflags |= NI_NODEADDR_FLAG_SITELOCAL;
 380                                         break;
 381                                 case 'g':
 382                                 case 'G':
 383                                         naflags |= NI_NODEADDR_FLAG_GLOBAL;
 384                                         break;
 385                                 case 'A': /* experimental. not in the spec */
 386 #ifdef NI_NODEADDR_FLAG_ANYCAST
 387                                         naflags |= NI_NODEADDR_FLAG_ANYCAST;
 388                                         break;
 389 #else
 390                                         errx(1,
 391 "-a A is not supported on the platform");
 392                                         /*NOTREACHED*/
 393 #endif
 394                                 default:
 395                                         usage();
 396                                         /*NOTREACHED*/
 397                                 }
 398                         }
 399                         break;
 400                 }
 401                 case 'b':
 402 #if defined(SO_SNDBUF) && defined(SO_RCVBUF)
 403                         errno = 0;
 404                         e = NULL;
 405                         lsockbufsize = strtoul(optarg, &e, 10);
 406                         sockbufsize = (int)lsockbufsize;
 407                         if (errno || !*optarg || *e ||
 408                             lsockbufsize > INT_MAX)
 409                                 errx(1, "invalid socket buffer size");
 410 #else
 411                         errx(1,
 412 "-b option ignored: SO_SNDBUF/SO_RCVBUF socket options not supported");
 413 #endif
 414                         break;
 415                 case 'C':               /* vlan priority code point */
 416                         pcp = strtol(optarg, &e, 10);
 417                         if (*optarg == '\0' || *e != '\0')
 418                                 errx(1, "illegal vlan pcp %s", optarg);
 419                         if (7 < pcp || pcp < -1)
 420                                 errx(1, "illegal vlan pcp -- %s", optarg);
 421                         break;
 422                 case 'c':
 423                         npackets = strtol(optarg, &e, 10);
 424                         if (npackets <= 0 || *optarg == '\0' || *e != '\0')
 425                                 errx(1,
 426                                     "illegal number of packets -- %s", optarg);
 427                         break;
 428                 case 'D':
 429                         options |= F_DONTFRAG;
 430                         break;
 431                 case 'd':
 432                         options |= F_SO_DEBUG;
 433                         break;
 434                 case 'f':
 435                         if (getuid()) {
 436                                 errno = EPERM;
 437                                 errx(1, "Must be superuser to flood ping");
 438                         }
 439                         options |= F_FLOOD;
 440                         setbuf(stdout, (char *)NULL);
 441                         break;
 442                 case 'e':
 443                         gateway = optarg;
 444                         break;
 445                 case 'H':
 446                         options |= F_HOSTNAME;
 447                         break;
 448                 case 'm':               /* hoplimit */
 449                         hoplimit = strtol(optarg, &e, 10);
 450                         if (*optarg == '\0' || *e != '\0')
 451                                 errx(1, "illegal hoplimit %s", optarg);
 452                         if (255 < hoplimit || hoplimit < -1)
 453                                 errx(1,
 454                                     "illegal hoplimit -- %s", optarg);
 455                         break;
 456                 case 'I':
 457                         ifname = optarg;
 458                         options |= F_INTERFACE;
 459 #ifndef USE_SIN6_SCOPE_ID
 460                         usepktinfo++;
 461 #endif
 462                         break;
 463                 case 'i':               /* wait between sending packets */
 464                         t = strtod(optarg, &e);
 465                         if (*optarg == '\0' || *e != '\0')
 466                                 errx(1, "illegal timing interval %s", optarg);
 467                         if (t < 1 && getuid()) {
 468                                 errx(1, "%s: only root may use interval < 1s",
 469                                     strerror(EPERM));
 470                         }
 471                         intvl.tv_sec = (time_t)t;
 472                         intvl.tv_nsec =
 473                             (long)((t - intvl.tv_sec) * 1000000000);
 474                         if (intvl.tv_sec < 0)
 475                                 errx(1, "illegal timing interval %s", optarg);
 476                         /* less than 1/hz does not make sense */
 477                         if (intvl.tv_sec == 0 && intvl.tv_nsec < 1000) {
 478                                 warnx("too small interval, raised to .000001");
 479                                 intvl.tv_nsec = 1000;
 480                         }
 481                         options |= F_INTERVAL;
 482                         break;
 483                 case 'l':
 484                         if (getuid()) {
 485                                 errno = EPERM;
 486                                 errx(1, "Must be superuser to preload");
 487                         }
 488                         preload = strtol(optarg, &e, 10);
 489                         if (preload < 0 || *optarg == '\0' || *e != '\0')
 490                                 errx(1, "illegal preload value -- %s", optarg);
 491                         break;
 492                 case 'u':
 493 #ifdef IPV6_USE_MIN_MTU
 494                         mflag++;
 495                         break;
 496 #else
 497                         errx(1, "-%c is not supported on this platform", ch);
 498                         /*NOTREACHED*/
 499 #endif
 500                 case 'n':
 501                         options &= ~F_HOSTNAME;
 502                         break;
 503                 case 'N':
 504                         options |= F_NIGROUP;
 505                         nig_oldmcprefix++;
 506                         break;
 507                 case 'o':
 508                         options |= F_ONCE;
 509                         break;
 510                 case 'p':               /* fill buffer with user pattern */
 511                         options |= F_PINGFILLED;
 512                         fill((char *)datap, optarg);
 513                                 break;
 514                 case 'q':
 515                         options |= F_QUIET;
 516                         break;
 517                 case 'a':
 518                         options |= F_AUDIBLE;
 519                         break;
 520                 case 'A':
 521                         options |= F_MISSED;
 522                         break;
 523                 case 'S':
 524                         memset(&hints, 0, sizeof(struct addrinfo));
 525                         hints.ai_flags = AI_NUMERICHOST; /* allow hostname? */
 526                         hints.ai_family = AF_INET6;
 527                         hints.ai_socktype = SOCK_RAW;
 528                         hints.ai_protocol = IPPROTO_ICMPV6;
 529
 530                         error = cap_getaddrinfo(capdns, optarg, NULL, &hints, &res);
 531                         if (error) {
 532                                 errx(1, "invalid source address: %s",
 533                                      gai_strerror(error));
 534                         }
 535                         /*
 536                          * res->ai_family must be AF_INET6 and res->ai_addrlen
 537                          * must be sizeof(src).
 538                          */
 539                         memcpy(&src, res->ai_addr, res->ai_addrlen);
 540                         srclen = res->ai_addrlen;
 541                         freeaddrinfo(res);
 542                         options |= F_SRCADDR;
 543                         break;
 544                 case 's':               /* size of packet to send */
 545                         datalen = strtol(optarg, &e, 10);
 546                         if (datalen <= 0 || *optarg == '\0' || *e != '\0')
 547                                 errx(1, "illegal datalen value -- %s", optarg);
 548                         if (datalen > MAXDATALEN) {
 549                                 errx(1,
 550                                     "datalen value too large, maximum is %d",
 551                                     MAXDATALEN);
 552                         }
 553                         break;
 554                 case 'O':
 555                         options &= ~F_NOUSERDATA;
 556                         options |= F_SUPTYPES;
 557                         break;
 558                 case 'v':
 559                         options |= F_VERBOSE;
 560                         break;
 561                 case 'y':
 562                         options &= ~F_NOUSERDATA;
 563                         options |= F_FQDN;
 564                         break;
 565                 case 'Y':
 566                         options &= ~F_NOUSERDATA;
 567                         options |= F_FQDNOLD;
 568                         break;
 569                 case 'W':
 570                         t = strtod(optarg, &e);
 571                         if (*e || e == optarg || t > (double)INT_MAX)
 572                                 err(EX_USAGE, "invalid timing interval: `%s'",
 573                                     optarg);
 574                         options |= F_WAITTIME;
 575                         waittime = (int)t;
 576                         break;
 577                 case 't':
 578                         alarmtimeout = strtoul(optarg, &e, 0);
 579                         if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
 580                                 errx(EX_USAGE, "invalid timeout: `%s'",
 581                                     optarg);
 582                         if (alarmtimeout > MAXALARM)
 583                                 errx(EX_USAGE, "invalid timeout: `%s' > %d",
 584                                     optarg, MAXALARM);
 585                         {
 586                                 struct itimerval itv;
 587
 588                                 timerclear(&itv.it_interval);
 589                                 timerclear(&itv.it_value);
 590                                 itv.it_value.tv_sec = (time_t)alarmtimeout;
 591                                 if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
 592                                         err(1, "setitimer");
 593                         }
 594                         break;
 595                 case 'z':               /* traffic class */
 596                         tclass = strtol(optarg, &e, 10);
 597                         if (*optarg == '\0' || *e != '\0')
 598                                 errx(1, "illegal traffic class %s", optarg);
 599                         if (255 < tclass || tclass < -1)
 600                                 errx(1,
 601                                     "illegal traffic class -- %s", optarg);
 602                         break;
 603 #ifdef IPSEC
 604 #ifdef IPSEC_POLICY_IPSEC
 605                 case 'P':
 606                         options |= F_POLICY;
 607                         if (!strncmp("in", optarg, 2)) {
 608                                 if ((policy_in = strdup(optarg)) == NULL)
 609                                         errx(1, "strdup");
 610                         } else if (!strncmp("out", optarg, 3)) {
 611                                 if ((policy_out = strdup(optarg)) == NULL)
 612                                         errx(1, "strdup");
 613                         } else
 614                                 errx(1, "invalid security policy");
 615                         break;
 616 #else
 617                 case 'Z':
 618                         options |= F_AUTHHDR;
 619                         break;
 620                 case 'E':
 621                         options |= F_ENCRYPT;
 622                         break;
 623 #endif /*IPSEC_POLICY_IPSEC*/
 624 #endif /*IPSEC*/
 625                 default:
 626                         usage();
 627                         /*NOTREACHED*/
 628                 }
 629         }
 630
 631         argc -= optind;
 632         argv += optind;
 633
 634         if (argc < 1) {
 635                 usage();
 636                 /*NOTREACHED*/
 637         }
 638
 639         if (argc > 1) {
 640 #ifdef IPV6_RECVRTHDR   /* 2292bis */
 641                 rthlen = CMSG_SPACE(inet6_rth_space(IPV6_RTHDR_TYPE_0,
 642                     argc - 1));
 643 #else  /* RFC2292 */
 644                 rthlen = inet6_rthdr_space(IPV6_RTHDR_TYPE_0, argc - 1);
 645 #endif
 646                 if (rthlen == 0) {
 647                         errx(1, "too many intermediate hops");
 648                         /*NOTREACHED*/
 649                 }
 650                 ip6optlen += rthlen;
 651         }
 652
 653         if (options & F_NIGROUP) {
 654                 target = nigroup(argv[argc - 1], nig_oldmcprefix);
 655                 if (target == NULL) {
 656                         usage();
 657                         /*NOTREACHED*/
 658                 }
 659         } else
 660                 target = argv[argc - 1];
 661
 662         /* cap_getaddrinfo */
 663         memset(&hints, 0, sizeof(struct addrinfo));
 664         hints.ai_flags = AI_CANONNAME;
 665         hints.ai_family = AF_INET6;
 666         hints.ai_socktype = SOCK_RAW;
 667         hints.ai_protocol = IPPROTO_ICMPV6;
 668
 669         error = cap_getaddrinfo(capdns, target, NULL, &hints, &res);
 670         if (error)
 671                 errx(1, "%s", gai_strerror(error));
 672         if (res->ai_canonname)
 673                 hostname = strdup(res->ai_canonname);
 674         else
 675                 hostname = target;
 676
 677         if (!res->ai_addr)
 678                 errx(1, "cap_getaddrinfo failed");
 679
 680         (void)memcpy(&dst, res->ai_addr, res->ai_addrlen);
 681
 682         if ((ssend = socket(res->ai_family, res->ai_socktype,
 683             res->ai_protocol)) < 0)
 684                 err(1, "socket ssend");
 685         if ((srecv = socket(res->ai_family, res->ai_socktype,
 686             res->ai_protocol)) < 0)
 687                 err(1, "socket srecv");
 688         freeaddrinfo(res);
 689
 690         /* set the source address if specified. */
 691         if ((options & F_SRCADDR) != 0) {
 692                 /* properly fill sin6_scope_id */
 693                 if (IN6_IS_ADDR_LINKLOCAL(&src.sin6_addr) && (
 694                     IN6_IS_ADDR_LINKLOCAL(&dst.sin6_addr) ||
 695                     IN6_IS_ADDR_MC_LINKLOCAL(&dst.sin6_addr) ||
 696                     IN6_IS_ADDR_MC_NODELOCAL(&dst.sin6_addr))) {
 697                         if (src.sin6_scope_id == 0)
 698                                 src.sin6_scope_id = dst.sin6_scope_id;
 699                         if (dst.sin6_scope_id == 0)
 700                                 dst.sin6_scope_id = src.sin6_scope_id;
 701                 }
 702                 if (bind(ssend, (struct sockaddr *)&src, srclen) != 0)
 703                         err(1, "bind");
 704         }
 705         /* set the gateway (next hop) if specified */
 706         if (gateway) {
 707                 memset(&hints, 0, sizeof(hints));
 708                 hints.ai_family = AF_INET6;
 709                 hints.ai_socktype = SOCK_RAW;
 710                 hints.ai_protocol = IPPROTO_ICMPV6;
 711
 712                 error = cap_getaddrinfo(capdns, gateway, NULL, &hints, &res);
 713                 if (error) {
 714                         errx(1, "cap_getaddrinfo for the gateway %s: %s",
 715                              gateway, gai_strerror(error));
 716                 }
 717                 if (res->ai_next && (options & F_VERBOSE))
 718                         warnx("gateway resolves to multiple addresses");
 719
 720                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_NEXTHOP,
 721                     res->ai_addr, res->ai_addrlen)) {
 722                         err(1, "setsockopt(IPV6_NEXTHOP)");
 723                 }
 724
 725                 freeaddrinfo(res);
 726         }
 727
 728         /*
 729          * let the kerel pass extension headers of incoming packets,
 730          * for privileged socket options
 731          */
 732         if ((options & F_VERBOSE) != 0) {
 733                 int opton = 1;
 734
 735 #ifdef IPV6_RECVHOPOPTS
 736                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVHOPOPTS, &opton,
 737                     sizeof(opton)))
 738                         err(1, "setsockopt(IPV6_RECVHOPOPTS)");
 739 #else  /* old adv. API */
 740                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_HOPOPTS, &opton,
 741                     sizeof(opton)))
 742                         err(1, "setsockopt(IPV6_HOPOPTS)");
 743 #endif
 744 #ifdef IPV6_RECVDSTOPTS
 745                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVDSTOPTS, &opton,
 746                     sizeof(opton)))
 747                         err(1, "setsockopt(IPV6_RECVDSTOPTS)");
 748 #else  /* old adv. API */
 749                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_DSTOPTS, &opton,
 750                     sizeof(opton)))
 751                         err(1, "setsockopt(IPV6_DSTOPTS)");
 752 #endif
 753 #ifdef IPV6_RECVRTHDRDSTOPTS
 754                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVRTHDRDSTOPTS, &opton,
 755                     sizeof(opton)))
 756                         err(1, "setsockopt(IPV6_RECVRTHDRDSTOPTS)");
 757 #endif
 758         }
 759
 760         /* revoke root privilege */
 761         if (seteuid(getuid()) != 0)
 762                 err(1, "seteuid() failed");
 763         if (setuid(getuid()) != 0)
 764                 err(1, "setuid() failed");
 765
 766         if ((options & F_FLOOD) && (options & F_INTERVAL))
 767                 errx(1, "-f and -i incompatible options");
 768
 769         if ((options & F_NOUSERDATA) == 0) {
 770                 if (datalen >= sizeof(struct tv32)) {
 771                         /* we can time transfer */
 772                         timing = 1;
 773                 } else
 774                         timing = 0;
 775                 /* in F_VERBOSE case, we may get non-echoreply packets*/
 776                 if (options & F_VERBOSE)
 777                         packlen = 2048 + IP6LEN + ICMP6ECHOLEN + EXTRA;
 778                 else
 779                         packlen = datalen + IP6LEN + ICMP6ECHOLEN + EXTRA;
 780         } else {
 781                 /* suppress timing for node information query */
 782                 timing = 0;
 783                 datalen = 2048;
 784                 packlen = 2048 + IP6LEN + ICMP6ECHOLEN + EXTRA;
 785         }
 786
 787         if (!(packet = (u_char *)malloc((u_int)packlen)))
 788                 err(1, "Unable to allocate packet");
 789         if (!(options & F_PINGFILLED))
 790                 for (i = ICMP6ECHOLEN; i < packlen; ++i)
 791                         *datap++ = i;
 792
 793         ident = getpid() & 0xFFFF;
 794         arc4random_buf(nonce, sizeof(nonce));
 795         optval = 1;
 796         if (options & F_DONTFRAG)
 797                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_DONTFRAG,
 798                     &optval, sizeof(optval)) == -1)
 799                         err(1, "IPV6_DONTFRAG");
 800         hold = 1;
 801
 802         if (options & F_SO_DEBUG) {
 803                 (void)setsockopt(ssend, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 804                     sizeof(hold));
 805                 (void)setsockopt(srecv, SOL_SOCKET, SO_DEBUG, (char *)&hold,
 806                     sizeof(hold));
 807         }
 808         optval = IPV6_DEFHLIM;
 809         if (IN6_IS_ADDR_MULTICAST(&dst.sin6_addr))
 810                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 811                     &optval, sizeof(optval)) == -1)
 812                         err(1, "IPV6_MULTICAST_HOPS");
 813 #ifdef IPV6_USE_MIN_MTU
 814         if (mflag != 1) {
 815                 optval = mflag > 1 ? 0 : 1;
 816
 817                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_USE_MIN_MTU,
 818                     &optval, sizeof(optval)) == -1)
 819                         err(1, "setsockopt(IPV6_USE_MIN_MTU)");
 820         }
 821 #ifdef IPV6_RECVPATHMTU
 822         else {
 823                 optval = 1;
 824                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVPATHMTU,
 825                     &optval, sizeof(optval)) == -1)
 826                         err(1, "setsockopt(IPV6_RECVPATHMTU)");
 827         }
 828 #endif /* IPV6_RECVPATHMTU */
 829 #endif /* IPV6_USE_MIN_MTU */
 830
 831 #ifdef IPSEC
 832 #ifdef IPSEC_POLICY_IPSEC
 833         if (options & F_POLICY) {
 834                 if (setpolicy(srecv, policy_in) < 0)
 835                         errx(1, "%s", ipsec_strerror());
 836                 if (setpolicy(ssend, policy_out) < 0)
 837                         errx(1, "%s", ipsec_strerror());
 838         }
 839 #else
 840         if (options & F_AUTHHDR) {
 841                 optval = IPSEC_LEVEL_REQUIRE;
 842 #ifdef IPV6_AUTH_TRANS_LEVEL
 843                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL,
 844                     &optval, sizeof(optval)) == -1)
 845                         err(1, "setsockopt(IPV6_AUTH_TRANS_LEVEL)");
 846                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL,
 847                      &optval, sizeof(optval)) == -1)
 848                         err(1, "setsockopt(IPV6_AUTH_TRANS_LEVEL)");
 849 #else /* old def */
 850                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_AUTH_LEVEL,
 851                     &optval, sizeof(optval)) == -1)
 852                         err(1, "setsockopt(IPV6_AUTH_LEVEL)");
 853                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_AUTH_LEVEL,
 854                     &optval, sizeof(optval)) == -1)
 855                         err(1, "setsockopt(IPV6_AUTH_LEVEL)");
 856 #endif
 857         }
 858         if (options & F_ENCRYPT) {
 859                 optval = IPSEC_LEVEL_REQUIRE;
 860                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL,
 861                     &optval, sizeof(optval)) == -1)
 862                         err(1, "setsockopt(IPV6_ESP_TRANS_LEVEL)");
 863                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL,
 864                     &optval, sizeof(optval)) == -1)
 865                         err(1, "setsockopt(IPV6_ESP_TRANS_LEVEL)");
 866         }
 867 #endif /*IPSEC_POLICY_IPSEC*/
 868 #endif
 869
 870 #ifdef ICMP6_FILTER
 871     {
 872         struct icmp6_filter filt;
 873         if (!(options & F_VERBOSE)) {
 874                 ICMP6_FILTER_SETBLOCKALL(&filt);
 875                 if ((options & F_FQDN) || (options & F_FQDNOLD) ||
 876                     (options & F_NODEADDR) || (options & F_SUPTYPES))
 877                         ICMP6_FILTER_SETPASS(ICMP6_NI_REPLY, &filt);
 878                 else
 879                         ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
 880         } else {
 881                 ICMP6_FILTER_SETPASSALL(&filt);
 882         }
 883         if (setsockopt(srecv, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
 884             sizeof(filt)) < 0)
 885                 err(1, "setsockopt(ICMP6_FILTER)");
 886     }
 887 #endif /*ICMP6_FILTER*/
 888
 889         /* let the kerel pass extension headers of incoming packets */
 890         if ((options & F_VERBOSE) != 0) {
 891                 int opton = 1;
 892
 893 #ifdef IPV6_RECVRTHDR
 894                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVRTHDR, &opton,
 895                     sizeof(opton)))
 896                         err(1, "setsockopt(IPV6_RECVRTHDR)");
 897 #else  /* old adv. API */
 898                 if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RTHDR, &opton,
 899                     sizeof(opton)))
 900                         err(1, "setsockopt(IPV6_RTHDR)");
 901 #endif
 902         }
 903
 904 /*
 905         optval = 1;
 906         if (IN6_IS_ADDR_MULTICAST(&dst.sin6_addr))
 907                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 908                     &optval, sizeof(optval)) == -1)
 909                         err(1, "IPV6_MULTICAST_LOOP");
 910 */
 911
 912         /* Specify the outgoing interface and/or the source address */
 913         if (usepktinfo)
 914                 ip6optlen += CMSG_SPACE(sizeof(struct in6_pktinfo));
 915
 916         if (hoplimit != -1)
 917                 ip6optlen += CMSG_SPACE(sizeof(int));
 918
 919         /* set IP6 packet options */
 920         if (ip6optlen) {
 921                 if ((scmsg = (char *)malloc(ip6optlen)) == NULL)
 922                         errx(1, "can't allocate enough memory");
 923                 smsghdr.msg_control = (caddr_t)scmsg;
 924                 smsghdr.msg_controllen = ip6optlen;
 925                 scmsgp = CMSG_FIRSTHDR(&smsghdr);
 926         }
 927         if (usepktinfo) {
 928                 cmsg_pktinfo = CMSG_DATA(scmsgp);
 929                 scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 930                 scmsgp->cmsg_level = IPPROTO_IPV6;
 931                 scmsgp->cmsg_type = IPV6_PKTINFO;
 932                 scmsgp = CMSG_NXTHDR(&smsghdr, scmsgp);
 933         }
 934
 935         /* set the outgoing interface */
 936         if (ifname) {
 937 #ifndef USE_SIN6_SCOPE_ID
 938                 /* pktinfo must have already been allocated */
 939                 if ((pktinfo.ipi6_ifindex = if_nametoindex(ifname)) == 0)
 940                         errx(1, "%s: invalid interface name", ifname);
 941 #else
 942                 if ((dst.sin6_scope_id = if_nametoindex(ifname)) == 0)
 943                         errx(1, "%s: invalid interface name", ifname);
 944 #endif
 945         }
 946         if (hoplimit != -1) {
 947                 scmsgp->cmsg_len = CMSG_LEN(sizeof(int));
 948                 scmsgp->cmsg_level = IPPROTO_IPV6;
 949                 scmsgp->cmsg_type = IPV6_HOPLIMIT;
 950                 memcpy(CMSG_DATA(scmsgp), &hoplimit, sizeof(hoplimit));
 951
 952                 scmsgp = CMSG_NXTHDR(&smsghdr, scmsgp);
 953         }
 954
 955         if (tclass != -1) {
 956                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_TCLASS,
 957                     &tclass, sizeof(tclass)) == -1)
 958                         err(1, "setsockopt(IPV6_TCLASS)");
 959         }
 960
 961         if (pcp != -2) {
 962                 if (setsockopt(ssend, IPPROTO_IPV6, IPV6_VLAN_PCP,
 963                     &pcp, sizeof(pcp)) == -1)
 964                         err(1, "setsockopt(IPV6_VLAN_PCP)");
 965         }
 966
 967         if (argc > 1) { /* some intermediate addrs are specified */
 968                 int hops;
 969                 int rthdrlen;
 970
 971                 rthdrlen = inet6_rth_space(IPV6_RTHDR_TYPE_0, argc - 1);
 972                 scmsgp->cmsg_len = CMSG_LEN(rthdrlen);
 973                 scmsgp->cmsg_level = IPPROTO_IPV6;
 974                 scmsgp->cmsg_type = IPV6_RTHDR;
 975                 rthdr = (struct ip6_rthdr *)CMSG_DATA(scmsgp);
 976                 rthdr = inet6_rth_init((void *)rthdr, rthdrlen,
 977                     IPV6_RTHDR_TYPE_0, argc - 1);
 978                 if (rthdr == NULL)
 979                         errx(1, "can't initialize rthdr");
 980
 981                 for (hops = 0; hops < argc - 1; hops++) {
 982                         memset(&hints, 0, sizeof(hints));
 983                         hints.ai_family = AF_INET6;
 984
 985                         if ((error = cap_getaddrinfo(capdns, argv[hops], NULL, &hints,
 986                             &res)))
 987                                 errx(1, "%s", gai_strerror(error));
 988                         if (res->ai_addr->sa_family != AF_INET6)
 989                                 errx(1,
 990                                     "bad addr family of an intermediate addr");
 991                         sin6 = (struct sockaddr_in6 *)(void *)res->ai_addr;
 992                         if (inet6_rth_add(rthdr, &sin6->sin6_addr))
 993                                 errx(1, "can't add an intermediate node");
 994                         freeaddrinfo(res);
 995                 }
 996
 997                 scmsgp = CMSG_NXTHDR(&smsghdr, scmsgp);
 998         }
 999
1000         /* From now on we will use only reverse DNS lookups. */
1001 #ifdef WITH_CASPER
1002         if (capdns != NULL) {
1003                 const char *types[1];
1004
1005                 types[0] = "ADDR2NAME";
1006                 if (cap_dns_type_limit(capdns, types, nitems(types)) < 0)
1007                         err(1, "unable to limit access to system.dns service");
1008         }
1009 #endif
1010         if (!(options & F_SRCADDR)) {
1011                 /*
1012                  * get the source address. XXX since we revoked the root
1013                  * privilege, we cannot use a raw socket for this.
1014                  */
1015                 int dummy;
1016                 socklen_t len = sizeof(src);
1017
1018                 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
1019                         err(1, "UDP socket");
1020
1021                 src.sin6_family = AF_INET6;
1022                 src.sin6_addr = dst.sin6_addr;
1023                 src.sin6_port = ntohs(DUMMY_PORT);
1024                 src.sin6_scope_id = dst.sin6_scope_id;
1025
1026                 if (usepktinfo &&
1027                     setsockopt(dummy, IPPROTO_IPV6, IPV6_PKTINFO,
1028                     (void *)&pktinfo, sizeof(pktinfo)))
1029                         err(1, "UDP setsockopt(IPV6_PKTINFO)");
1030
1031                 if (hoplimit != -1 &&
1032                     setsockopt(dummy, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1033                     (void *)&hoplimit, sizeof(hoplimit)))
1034                         err(1, "UDP setsockopt(IPV6_UNICAST_HOPS)");
1035
1036                 if (hoplimit != -1 &&
1037                     setsockopt(dummy, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1038                     (void *)&hoplimit, sizeof(hoplimit)))
1039                         err(1, "UDP setsockopt(IPV6_MULTICAST_HOPS)");
1040
1041                 if (rthdr &&
1042                     setsockopt(dummy, IPPROTO_IPV6, IPV6_RTHDR,
1043                     (void *)rthdr, (rthdr->ip6r_len + 1) << 3))
1044                         err(1, "UDP setsockopt(IPV6_RTHDR)");
1045
1046                 if (connect(dummy, (struct sockaddr *)&src, len) < 0)
1047                         err(1, "UDP connect");
1048
1049                 if (getsockname(dummy, (struct sockaddr *)&src, &len) < 0)
1050                         err(1, "getsockname");
1051
1052                 close(dummy);
1053         }
1054
1055         /* Save pktinfo in the ancillary data. */
1056         if (usepktinfo)
1057                 memcpy(cmsg_pktinfo, &pktinfo, sizeof(pktinfo));
1058
1059         if (connect(ssend, (struct sockaddr *)&dst, sizeof(dst)) != 0)
1060                 err(1, "connect() ssend");
1061
1062         caph_cache_catpages();
1063         if (caph_enter_casper() < 0)
1064                 err(1, "caph_enter_casper");
1065
1066         cap_rights_init(&rights_stdin);
1067         if (caph_rights_limit(STDIN_FILENO, &rights_stdin) < 0)
1068                 err(1, "caph_rights_limit stdin");
1069         if (caph_limit_stdout() < 0)
1070                 err(1, "caph_limit_stdout");
1071         if (caph_limit_stderr() < 0)
1072                 err(1, "caph_limit_stderr");
1073
1074         cap_rights_init(&rights_srecv, CAP_RECV, CAP_EVENT, CAP_SETSOCKOPT);
1075         if (caph_rights_limit(srecv, &rights_srecv) < 0)
1076                 err(1, "caph_rights_limit srecv");
1077         cap_rights_init(&rights_ssend, CAP_SEND, CAP_SETSOCKOPT);
1078         if (caph_rights_limit(ssend, &rights_ssend) < 0)
1079                 err(1, "caph_rights_limit ssend");
1080
1081 #if defined(SO_SNDBUF) && defined(SO_RCVBUF)
1082         if (sockbufsize) {
1083                 if (datalen > (size_t)sockbufsize)
1084                         warnx("you need -b to increase socket buffer size");
1085                 if (setsockopt(ssend, SOL_SOCKET, SO_SNDBUF, &sockbufsize,
1086                     sizeof(sockbufsize)) < 0)
1087                         err(1, "setsockopt(SO_SNDBUF)");
1088                 if (setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, &sockbufsize,
1089                     sizeof(sockbufsize)) < 0)
1090                         err(1, "setsockopt(SO_RCVBUF)");
1091         }
1092         else {
1093                 if (datalen > 8 * 1024) /*XXX*/
1094                         warnx("you need -b to increase socket buffer size");
1095                 /*
1096                  * When pinging the broadcast address, you can get a lot of
1097                  * answers. Doing something so evil is useful if you are trying
1098                  * to stress the ethernet, or just want to fill the arp cache
1099                  * to get some stuff for /etc/ethers.
1100                  */
1101                 hold = 48 * 1024;
1102                 setsockopt(srecv, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
1103                     sizeof(hold));
1104         }
1105 #endif
1106
1107         optval = 1;
1108 #ifndef USE_SIN6_SCOPE_ID
1109 #ifdef IPV6_RECVPKTINFO
1110         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVPKTINFO, &optval,
1111             sizeof(optval)) < 0)
1112                 warn("setsockopt(IPV6_RECVPKTINFO)"); /* XXX err? */
1113 #else  /* old adv. API */
1114         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_PKTINFO, &optval,
1115             sizeof(optval)) < 0)
1116                 warn("setsockopt(IPV6_PKTINFO)"); /* XXX err? */
1117 #endif
1118 #endif /* USE_SIN6_SCOPE_ID */
1119 #ifdef IPV6_RECVHOPLIMIT
1120         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &optval,
1121             sizeof(optval)) < 0)
1122                 warn("setsockopt(IPV6_RECVHOPLIMIT)"); /* XXX err? */
1123 #else  /* old adv. API */
1124         if (setsockopt(srecv, IPPROTO_IPV6, IPV6_HOPLIMIT, &optval,
1125             sizeof(optval)) < 0)
1126                 warn("setsockopt(IPV6_HOPLIMIT)"); /* XXX err? */
1127 #endif
1128
1129         cap_rights_clear(&rights_srecv, CAP_SETSOCKOPT);
1130         if (caph_rights_limit(srecv, &rights_srecv) < 0)
1131                 err(1, "caph_rights_limit srecv setsockopt");
1132         cap_rights_clear(&rights_ssend, CAP_SETSOCKOPT);
1133         if (caph_rights_limit(ssend, &rights_ssend) < 0)
1134                 err(1, "caph_rights_limit ssend setsockopt");
1135
1136         printf("PING6(%lu=40+8+%lu bytes) ", (unsigned long)(40 + pingerlen()),
1137             (unsigned long)(pingerlen() - 8));
1138         printf("%s --> ", pr_addr((struct sockaddr *)&src, sizeof(src)));
1139         printf("%s\n", pr_addr((struct sockaddr *)&dst, sizeof(dst)));
1140
1141         if (preload == 0)
1142                 pinger();
1143         else {
1144                 if (npackets != 0 && preload > npackets)
1145                         preload = npackets;
1146                 while (preload--)
1147                         pinger();
1148         }
1149         clock_gettime(CLOCK_MONOTONIC, &last);
1150
1151         sigemptyset(&si_sa.sa_mask);
1152         si_sa.sa_flags = 0;
1153         si_sa.sa_handler = onsignal;
1154         if (sigaction(SIGINT, &si_sa, 0) == -1)
1155                 err(EX_OSERR, "sigaction SIGINT");
1156         seenint = 0;
1157 #ifdef SIGINFO
1158         if (sigaction(SIGINFO, &si_sa, 0) == -1)
1159                 err(EX_OSERR, "sigaction SIGINFO");
1160         seeninfo = 0;
1161 #endif
1162         if (alarmtimeout > 0) {
1163                 if (sigaction(SIGALRM, &si_sa, 0) == -1)
1164                         err(EX_OSERR, "sigaction SIGALRM");
1165         }
1166         if (options & F_FLOOD) {
1167                 intvl.tv_sec = 0;
1168                 intvl.tv_nsec = 10000000;
1169         }
1170
1171         almost_done = 0;
1172         while (seenint == 0) {
1173                 struct timespec now, timeout;
1174                 struct msghdr m;
1175                 struct iovec iov[2];
1176                 fd_set rfds;
1177                 int n;
1178
1179                 /* signal handling */
1180                 if (seenint)
1181                         onint(SIGINT);
1182 #ifdef SIGINFO
1183                 if (seeninfo) {
1184                         summary();
1185                         seeninfo = 0;
1186                         continue;
1187                 }
1188 #endif
1189                 FD_ZERO(&rfds);
1190                 FD_SET(srecv, &rfds);
1191                 clock_gettime(CLOCK_MONOTONIC, &now);
1192                 timespecadd(&last, &intvl, &timeout);
1193                 timespecsub(&timeout, &now, &timeout);
1194                 if (timeout.tv_sec < 0)
1195                         timespecclear(&timeout);
1196
1197                 n = pselect(srecv + 1, &rfds, NULL, NULL, &timeout, NULL);
1198                 if (n < 0)
1199                         continue;       /* EINTR */
1200                 if (n == 1) {
1201                         m.msg_name = (caddr_t)&from;
1202                         m.msg_namelen = sizeof(from);
1203                         memset(&iov, 0, sizeof(iov));
1204                         iov[0].iov_base = (caddr_t)packet;
1205                         iov[0].iov_len = packlen;
1206                         m.msg_iov = iov;
1207                         m.msg_iovlen = 1;
1208                         memset(cm, 0, CONTROLLEN);
1209                         m.msg_control = (void *)cm;
1210                         m.msg_controllen = CONTROLLEN;
1211
1212                         cc = recvmsg(srecv, &m, 0);
1213                         if (cc < 0) {
1214                                 if (errno != EINTR) {
1215                                         warn("recvmsg");
1216                                         sleep(1);
1217                                 }
1218                                 continue;
1219                         } else if (cc == 0) {
1220                                 int mtu;
1221
1222                                 /*
1223                                  * receive control messages only. Process the
1224                                  * exceptions (currently the only possibility is
1225                                  * a path MTU notification.)
1226                                  */
1227                                 if ((mtu = get_pathmtu(&m)) > 0) {
1228                                         if ((options & F_VERBOSE) != 0) {
1229                                                 printf("new path MTU (%d) is "
1230                                                     "notified\n", mtu);
1231                                         }
1232                                 }
1233                                 continue;
1234                         } else {
1235                                 /*
1236                                  * an ICMPv6 message (probably an echoreply)
1237                                  * arrived.
1238                                  */
1239                                 pr_pack(packet, cc, &m);
1240                         }
1241                         if (((options & F_ONCE) != 0 && nreceived > 0) ||
1242                             (npackets > 0 && nreceived >= npackets))
1243                                 break;
1244                 }
1245                 if (n == 0 || (options & F_FLOOD)) {
1246                         if (npackets == 0 || ntransmitted < npackets)
1247                                 pinger();
1248                         else {
1249                                 if (almost_done)
1250                                         break;
1251                                 almost_done = 1;
1252                         /*
1253                          * If we're not transmitting any more packets,
1254                          * change the timer to wait two round-trip times
1255                          * if we've received any packets or (waittime)
1256                          * milliseconds if we haven't.
1257                          */
1258                                 intvl.tv_nsec = 0;
1259                                 if (nreceived) {
1260                                         intvl.tv_sec = 2 * tmax / 1000;
1261                                         if (intvl.tv_sec == 0)
1262                                                 intvl.tv_sec = 1;
1263                                 } else {
1264                                         intvl.tv_sec = waittime / 1000;
1265                                         intvl.tv_nsec =
1266                                                 waittime % 1000 * 1000000;
1267                                 }
1268                         }
1269                         clock_gettime(CLOCK_MONOTONIC, &last);
1270                         if (ntransmitted - nreceived - 1 > nmissedmax) {
1271                                 nmissedmax = ntransmitted - nreceived - 1;
1272                                 if (options & F_MISSED)
1273                                         (void)write(STDOUT_FILENO, &BBELL, 1);
1274                         }
1275                 }
1276         }
1277         sigemptyset(&si_sa.sa_mask);
1278         si_sa.sa_flags = 0;
1279         si_sa.sa_handler = SIG_IGN;
1280         sigaction(SIGINT, &si_sa, 0);
1281         sigaction(SIGALRM, &si_sa, 0);
1282         summary();
1283
1284         if(packet != NULL)
1285                 free(packet);
1286
1287         if (nreceived > 0)
1288                 exit(0);
1289         else if (ntransmitted > ntransmitfailures)
1290                 exit(2);
1291         else
1292                 exit(EX_OSERR);
1293 }
1294
1295 static void
1296 onsignal(int sig)
1297 {
1298
1299         switch (sig) {
1300         case SIGINT:
1301         case SIGALRM:
1302                 seenint++;
1303                 break;
1304 #ifdef SIGINFO
1305         case SIGINFO:
1306                 seeninfo++;
1307                 break;
1308 #endif
1309         }
1310 }
1311
1312 /*
1313  * pinger --
1314  *      Compose and transmit an ICMP ECHO REQUEST packet.  The IP packet
1315  * will be added on by the kernel.  The ID field is our UNIX process ID,
1316  * and the sequence number is an ascending integer.  The first 8 bytes
1317  * of the data portion are used to hold a UNIX "timespec" struct in VAX
1318  * byte-order, to compute the round-trip time.
1319  */
1320 static size_t
1321 pingerlen(void)
1322 {
1323         size_t l;
1324
1325         if (options & F_FQDN)
1326                 l = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1327         else if (options & F_FQDNOLD)
1328                 l = ICMP6_NIQLEN;
1329         else if (options & F_NODEADDR)
1330                 l = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1331         else if (options & F_SUPTYPES)
1332                 l = ICMP6_NIQLEN;
1333         else
1334                 l = ICMP6ECHOLEN + datalen;
1335
1336         return l;
1337 }
1338
1339 static int
1340 pinger(void)
1341 {
1342         struct icmp6_hdr *icp;
1343         struct iovec iov[2];
1344         int i, cc;
1345         struct icmp6_nodeinfo *nip;
1346         uint16_t seq;
1347
1348         if (npackets && ntransmitted >= npackets)
1349                 return(-1);     /* no more transmission */
1350
1351         icp = (struct icmp6_hdr *)outpack;
1352         nip = (struct icmp6_nodeinfo *)outpack;
1353         memset(icp, 0, sizeof(*icp));
1354         icp->icmp6_cksum = 0;
1355         seq = ntransmitted++;
1356         CLR(seq % mx_dup_ck);
1357
1358         if (options & F_FQDN) {
1359                 uint16_t s;
1360
1361                 icp->icmp6_type = ICMP6_NI_QUERY;
1362                 icp->icmp6_code = ICMP6_NI_SUBJ_IPV6;
1363                 nip->ni_qtype = htons(NI_QTYPE_FQDN);
1364                 nip->ni_flags = htons(0);
1365
1366                 memcpy(nip->icmp6_ni_nonce, nonce,
1367                     sizeof(nip->icmp6_ni_nonce));
1368                 s = htons(seq);
1369                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1370
1371                 memcpy(&outpack[ICMP6_NIQLEN], &dst.sin6_addr,
1372                     sizeof(dst.sin6_addr));
1373                 cc = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1374                 datalen = 0;
1375         } else if (options & F_FQDNOLD) {
1376                 uint16_t s;
1377                 /* packet format in 03 draft - no Subject data on queries */
1378                 icp->icmp6_type = ICMP6_NI_QUERY;
1379                 icp->icmp6_code = 0;    /* code field is always 0 */
1380                 nip->ni_qtype = htons(NI_QTYPE_FQDN);
1381                 nip->ni_flags = htons(0);
1382
1383                 memcpy(nip->icmp6_ni_nonce, nonce,
1384                     sizeof(nip->icmp6_ni_nonce));
1385                 s = htons(seq);
1386                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1387
1388                 cc = ICMP6_NIQLEN;
1389                 datalen = 0;
1390         } else if (options & F_NODEADDR) {
1391                 uint16_t s;
1392
1393                 icp->icmp6_type = ICMP6_NI_QUERY;
1394                 icp->icmp6_code = ICMP6_NI_SUBJ_IPV6;
1395                 nip->ni_qtype = htons(NI_QTYPE_NODEADDR);
1396                 nip->ni_flags = naflags;
1397
1398                 memcpy(nip->icmp6_ni_nonce, nonce,
1399                     sizeof(nip->icmp6_ni_nonce));
1400                 s = htons(seq);
1401                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1402
1403                 memcpy(&outpack[ICMP6_NIQLEN], &dst.sin6_addr,
1404                     sizeof(dst.sin6_addr));
1405                 cc = ICMP6_NIQLEN + sizeof(dst.sin6_addr);
1406                 datalen = 0;
1407         } else if (options & F_SUPTYPES) {
1408                 uint16_t s;
1409
1410                 icp->icmp6_type = ICMP6_NI_QUERY;
1411                 icp->icmp6_code = ICMP6_NI_SUBJ_FQDN;   /*empty*/
1412                 nip->ni_qtype = htons(NI_QTYPE_SUPTYPES);
1413                 /* we support compressed bitmap */
1414                 nip->ni_flags = NI_SUPTYPE_FLAG_COMPRESS;
1415
1416                 memcpy(nip->icmp6_ni_nonce, nonce,
1417                     sizeof(nip->icmp6_ni_nonce));
1418                 s = htons(seq);
1419                 memcpy(nip->icmp6_ni_nonce, &s, sizeof(s));
1420
1421                 cc = ICMP6_NIQLEN;
1422                 datalen = 0;
1423         } else {
1424                 icp->icmp6_type = ICMP6_ECHO_REQUEST;
1425                 icp->icmp6_code = 0;
1426                 icp->icmp6_id = htons(ident);
1427                 icp->icmp6_seq = htons(seq);
1428                 if (timing) {
1429                         struct timespec tv;
1430                         struct tv32 tv32;
1431                         (void)clock_gettime(CLOCK_MONOTONIC, &tv);
1432                         /*
1433                          * Truncate seconds down to 32 bits in order
1434                          * to fit the timestamp within 8 bytes of the
1435                          * packet. We're only concerned with
1436                          * durations, not absolute times.
1437                          */
1438                         tv32.tv32_sec = (uint32_t)htonl(tv.tv_sec);
1439                         tv32.tv32_nsec = (uint32_t)htonl(tv.tv_nsec);
1440                         memcpy(&outpack[ICMP6ECHOLEN], &tv32, sizeof(tv32));
1441                 }
1442                 cc = ICMP6ECHOLEN + datalen;
1443         }
1444
1445 #ifdef DIAGNOSTIC
1446         if (pingerlen() != cc)
1447                 errx(1, "internal error; length mismatch");
1448 #endif
1449
1450         memset(&iov, 0, sizeof(iov));
1451         iov[0].iov_base = (caddr_t)outpack;
1452         iov[0].iov_len = cc;
1453         smsghdr.msg_iov = iov;
1454         smsghdr.msg_iovlen = 1;
1455
1456         i = sendmsg(ssend, &smsghdr, 0);
1457
1458         if (i < 0 || i != cc)  {
1459                 if (i < 0) {
1460                         ntransmitfailures++;
1461                         warn("sendmsg");
1462                 }
1463                 (void)printf("ping6: wrote %s %d chars, ret=%d\n",
1464                     hostname, cc, i);
1465         }
1466         if (!(options & F_QUIET) && options & F_FLOOD)
1467                 (void)write(STDOUT_FILENO, &DOT, 1);
1468
1469         return(0);
1470 }
1471
1472 static int
1473 myechoreply(const struct icmp6_hdr *icp)
1474 {
1475         if (ntohs(icp->icmp6_id) == ident)
1476                 return 1;
1477         else
1478                 return 0;
1479 }
1480
1481 static int
1482 mynireply(const struct icmp6_nodeinfo *nip)
1483 {
1484         if (memcmp(nip->icmp6_ni_nonce + sizeof(u_int16_t),
1485             nonce + sizeof(u_int16_t),
1486             sizeof(nonce) - sizeof(u_int16_t)) == 0)
1487                 return 1;
1488         else
1489                 return 0;
1490 }
1491
1492 /*
1493  * Decode a name from a DNS message.
1494  *
1495  * Format of the message is described in RFC 1035 subsection 4.1.4.
1496  *
1497  * Arguments:
1498  *   sp     - Pointer to a DNS pointer octet or to the first octet of a label
1499  *            in the message.
1500  *   ep     - Pointer to the end of the message (one step past the last octet).
1501  *   base   - Pointer to the beginning of the message.
1502  *   buf    - Buffer into which the decoded name will be saved.
1503  *   bufsiz - Size of the buffer 'buf'.
1504  *
1505  * Return value:
1506  *   Pointer to an octet immediately following the ending zero octet
1507  *   of the decoded label, or NULL if an error occured.
1508  */
1509 static const char *
1510 dnsdecode(const u_char *sp, const u_char *ep, const u_char *base, char *buf,
1511         size_t bufsiz)
1512 {
1513         int i;
1514         const u_char *cp;
1515         char cresult[MAXDNAME + 1];
1516         const u_char *comp;
1517         int l;
1518
1519         cp = sp;
1520         *buf = '\0';
1521
1522         if (cp >= ep)
1523                 return NULL;
1524         while (cp < ep) {
1525                 i = *cp;
1526                 if (i == 0 || cp != sp) {
1527                         if (strlcat((char *)buf, ".", bufsiz) >= bufsiz)
1528                                 return NULL;    /*result overrun*/
1529                 }
1530                 if (i == 0)
1531                         break;
1532                 cp++;
1533
1534                 if ((i & 0xc0) == 0xc0 && cp - base > (i & 0x3f)) {
1535                         /* DNS compression */
1536                         if (!base)
1537                                 return NULL;
1538
1539                         comp = base + (i & 0x3f);
1540                         if (dnsdecode(comp, cp, base, cresult,
1541                             sizeof(cresult)) == NULL)
1542                                 return NULL;
1543                         if (strlcat(buf, cresult, bufsiz) >= bufsiz)
1544                                 return NULL;    /*result overrun*/
1545                         break;
1546                 } else if ((i & 0x3f) == i) {
1547                         if (i > ep - cp)
1548                                 return NULL;    /*source overrun*/
1549                         while (i-- > 0 && cp < ep) {
1550                                 l = snprintf(cresult, sizeof(cresult),
1551                                     isprint(*cp) ? "%c" : "\\%03o", *cp & 0xff);
1552                                 if ((size_t)l >= sizeof(cresult) || l < 0)
1553                                         return NULL;
1554                                 if (strlcat(buf, cresult, bufsiz) >= bufsiz)
1555                                         return NULL;    /*result overrun*/
1556                                 cp++;
1557                         }
1558                 } else
1559                         return NULL;    /*invalid label*/
1560         }
1561         if (i != 0)
1562                 return NULL;    /*not terminated*/
1563         cp++;
1564         return cp;
1565 }
1566
1567 /*
1568  * pr_pack --
1569  *      Print out the packet, if it came from us.  This logic is necessary
1570  * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
1571  * which arrive ('tis only fair).  This permits multiple copies of this
1572  * program to be run without having intermingled output (or statistics!).
1573  */
1574 static void
1575 pr_pack(u_char *buf, int cc, struct msghdr *mhdr)
1576 {
1577 #define safeputc(c)     printf((isprint((c)) ? "%c" : "\\%03o"), c)
1578         struct icmp6_hdr *icp;
1579         struct icmp6_nodeinfo *ni;
1580         int i;
1581         int hoplim;
1582         struct sockaddr *from;
1583         int fromlen;
1584         const u_char *cp = NULL;
1585         u_char *dp, *end = buf + cc;
1586         struct in6_pktinfo *pktinfo = NULL;
1587         struct timespec tv, tp;
1588         struct tv32 tpp;
1589         double triptime = 0;
1590         int dupflag;
1591         size_t off;
1592         int oldfqdn;
1593         u_int16_t seq;
1594         char dnsname[MAXDNAME + 1];
1595
1596         (void)clock_gettime(CLOCK_MONOTONIC, &tv);
1597
1598         if (!mhdr || !mhdr->msg_name ||
1599             mhdr->msg_namelen != sizeof(struct sockaddr_in6) ||
1600             ((struct sockaddr *)mhdr->msg_name)->sa_family != AF_INET6) {
1601                 if (options & F_VERBOSE)
1602                         warnx("invalid peername");
1603                 return;
1604         }
1605         from = (struct sockaddr *)mhdr->msg_name;
1606         fromlen = mhdr->msg_namelen;
1607         if (cc < (int)sizeof(struct icmp6_hdr)) {
1608                 if (options & F_VERBOSE)
1609                         warnx("packet too short (%d bytes) from %s", cc,
1610                             pr_addr(from, fromlen));
1611                 return;
1612         }
1613         if (((mhdr->msg_flags & MSG_CTRUNC) != 0) &&
1614             (options & F_VERBOSE) != 0)
1615                 warnx("some control data discarded, insufficient buffer size");
1616         icp = (struct icmp6_hdr *)buf;
1617         ni = (struct icmp6_nodeinfo *)buf;
1618         off = 0;
1619
1620         if ((hoplim = get_hoplim(mhdr)) == -1) {
1621                 warnx("failed to get receiving hop limit");
1622                 return;
1623         }
1624         if ((pktinfo = get_rcvpktinfo(mhdr)) == NULL) {
1625                 warnx("failed to get receiving packet information");
1626                 return;
1627         }
1628
1629         if (icp->icmp6_type == ICMP6_ECHO_REPLY && myechoreply(icp)) {
1630                 seq = ntohs(icp->icmp6_seq);
1631                 ++nreceived;
1632                 if (timing) {
1633                         memcpy(&tpp, icp + 1, sizeof(tpp));
1634                         tp.tv_sec = ntohl(tpp.tv32_sec);
1635                         tp.tv_nsec = ntohl(tpp.tv32_nsec);
1636                         timespecsub(&tv, &tp, &tv);
1637                         triptime = ((double)tv.tv_sec) * 1000.0 +
1638                             ((double)tv.tv_nsec) / 1000000.0;
1639                         tsum += triptime;
1640                         tsumsq += triptime * triptime;
1641                         if (triptime < tmin)
1642                                 tmin = triptime;
1643                         if (triptime > tmax)
1644                                 tmax = triptime;
1645                 }
1646
1647                 if (TST(seq % mx_dup_ck)) {
1648                         ++nrepeats;
1649                         --nreceived;
1650                         dupflag = 1;
1651                 } else {
1652                         SET(seq % mx_dup_ck);
1653                         dupflag = 0;
1654                 }
1655
1656                 if (options & F_QUIET)
1657                         return;
1658
1659                 if (options & F_WAITTIME && triptime > waittime) {
1660                         ++nrcvtimeout;
1661                         return;
1662                 }
1663
1664                 if (options & F_FLOOD)
1665                         (void)write(STDOUT_FILENO, &BSPACE, 1);
1666                 else {
1667                         if (options & F_AUDIBLE)
1668                                 (void)write(STDOUT_FILENO, &BBELL, 1);
1669                         (void)printf("%d bytes from %s, icmp_seq=%u", cc,
1670                             pr_addr(from, fromlen), seq);
1671                         (void)printf(" hlim=%d", hoplim);
1672                         if ((options & F_VERBOSE) != 0) {
1673                                 struct sockaddr_in6 dstsa;
1674
1675                                 memset(&dstsa, 0, sizeof(dstsa));
1676                                 dstsa.sin6_family = AF_INET6;
1677                                 dstsa.sin6_len = sizeof(dstsa);
1678                                 dstsa.sin6_scope_id = pktinfo->ipi6_ifindex;
1679                                 dstsa.sin6_addr = pktinfo->ipi6_addr;
1680                                 (void)printf(" dst=%s",
1681                                     pr_addr((struct sockaddr *)&dstsa,
1682                                     sizeof(dstsa)));
1683                         }
1684                         if (timing)
1685                                 (void)printf(" time=%.3f ms", triptime);
1686                         if (dupflag)
1687                                 (void)printf("(DUP!)");
1688                         /* check the data */
1689                         cp = buf + off + ICMP6ECHOLEN + ICMP6ECHOTMLEN;
1690                         dp = outpack + ICMP6ECHOLEN + ICMP6ECHOTMLEN;
1691                         for (i = 8; cp < end; ++i, ++cp, ++dp) {
1692                                 if (*cp != *dp) {
1693                                         (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", i, *dp, *cp);
1694                                         break;
1695                                 }
1696                         }
1697                 }
1698         } else if (icp->icmp6_type == ICMP6_NI_REPLY && mynireply(ni)) {
1699                 memcpy(&seq, ni->icmp6_ni_nonce, sizeof(seq));
1700                 seq = ntohs(seq);
1701                 ++nreceived;
1702                 if (TST(seq % mx_dup_ck)) {
1703                         ++nrepeats;
1704                         --nreceived;
1705                         dupflag = 1;
1706                 } else {
1707                         SET(seq % mx_dup_ck);
1708                         dupflag = 0;
1709                 }
1710
1711                 if (options & F_QUIET)
1712                         return;
1713
1714                 (void)printf("%d bytes from %s: ", cc, pr_addr(from, fromlen));
1715
1716                 switch (ntohs(ni->ni_code)) {
1717                 case ICMP6_NI_SUCCESS:
1718                         break;
1719                 case ICMP6_NI_REFUSED:
1720                         printf("refused, type 0x%x", ntohs(ni->ni_type));
1721                         goto fqdnend;
1722                 case ICMP6_NI_UNKNOWN:
1723                         printf("unknown, type 0x%x", ntohs(ni->ni_type));
1724                         goto fqdnend;
1725                 default:
1726                         printf("unknown code 0x%x, type 0x%x",
1727                             ntohs(ni->ni_code), ntohs(ni->ni_type));
1728                         goto fqdnend;
1729                 }
1730
1731                 switch (ntohs(ni->ni_qtype)) {
1732                 case NI_QTYPE_NOOP:
1733                         printf("NodeInfo NOOP");
1734                         break;
1735                 case NI_QTYPE_SUPTYPES:
1736                         pr_suptypes(ni, end - (u_char *)ni);
1737                         break;
1738                 case NI_QTYPE_NODEADDR:
1739                         pr_nodeaddr(ni, end - (u_char *)ni);
1740                         break;
1741                 case NI_QTYPE_FQDN:
1742                 default:        /* XXX: for backward compatibility */
1743                         cp = (u_char *)ni + ICMP6_NIRLEN;
1744                         if (buf[off + ICMP6_NIRLEN] ==
1745                             cc - off - ICMP6_NIRLEN - 1)
1746                                 oldfqdn = 1;
1747                         else
1748                                 oldfqdn = 0;
1749                         if (oldfqdn) {
1750                                 cp++;   /* skip length */
1751                                 while (cp < end) {
1752                                         safeputc(*cp & 0xff);
1753                                         cp++;
1754                                 }
1755                         } else {
1756                                 i = 0;
1757                                 while (cp < end) {
1758                                         cp = dnsdecode((const u_char *)cp, end,
1759                                             (const u_char *)(ni + 1), dnsname,
1760                                             sizeof(dnsname));
1761                                         if (cp == NULL) {
1762                                                 printf("???");
1763                                                 break;
1764                                         }
1765                                         /*
1766                                          * name-lookup special handling for
1767                                          * truncated name
1768                                          */
1769                                         if (cp + 1 <= end && !*cp &&
1770                                             strlen(dnsname) > 0) {
1771                                                 dnsname[strlen(dnsname) - 1] = '\0';
1772                                                 cp++;
1773                                         }
1774                                         printf("%s%s", i > 0 ? "," : "",
1775                                             dnsname);
1776                                 }
1777                         }
1778                         if (options & F_VERBOSE) {
1779                                 u_long t;
1780                                 int32_t ttl;
1781                                 int comma = 0;
1782
1783                                 (void)printf(" (");     /*)*/
1784
1785                                 switch (ni->ni_code) {
1786                                 case ICMP6_NI_REFUSED:
1787                                         (void)printf("refused");
1788                                         comma++;
1789                                         break;
1790                                 case ICMP6_NI_UNKNOWN:
1791                                         (void)printf("unknown qtype");
1792                                         comma++;
1793                                         break;
1794                                 }
1795
1796                                 if ((end - (u_char *)ni) < ICMP6_NIRLEN) {
1797                                         /* case of refusion, unknown */
1798                                         /*(*/
1799                                         putchar(')');
1800                                         goto fqdnend;
1801                                 }
1802                                 memcpy(&t, &buf[off+ICMP6ECHOLEN+8], sizeof(t));
1803                                 ttl = (int32_t)ntohl(t);
1804                                 if (comma)
1805                                         printf(",");
1806                                 if (!(ni->ni_flags & NI_FQDN_FLAG_VALIDTTL)) {
1807                                         (void)printf("TTL=%d:meaningless",
1808                                             (int)ttl);
1809                                 } else {
1810                                         if (ttl < 0) {
1811                                                 (void)printf("TTL=%d:invalid",
1812                                                    ttl);
1813                                         } else
1814                                                 (void)printf("TTL=%d", ttl);
1815                                 }
1816                                 comma++;
1817
1818                                 if (oldfqdn) {
1819                                         if (comma)
1820                                                 printf(",");
1821                                         printf("03 draft");
1822                                         comma++;
1823                                 } else {
1824                                         cp = (u_char *)ni + ICMP6_NIRLEN;
1825                                         if (cp == end) {
1826                                                 if (comma)
1827                                                         printf(",");
1828                                                 printf("no name");
1829                                                 comma++;
1830                                         }
1831                                 }
1832
1833                                 if (buf[off + ICMP6_NIRLEN] !=
1834                                     cc - off - ICMP6_NIRLEN - 1 && oldfqdn) {
1835                                         if (comma)
1836                                                 printf(",");
1837                                         (void)printf("invalid namelen:%d/%lu",
1838                                             buf[off + ICMP6_NIRLEN],
1839                                             (u_long)cc - off - ICMP6_NIRLEN - 1);
1840                                         comma++;
1841                                 }
1842                                 /*(*/
1843                                 putchar(')');
1844                         }
1845                 fqdnend:
1846                         ;
1847                 }
1848         } else {
1849                 /* We've got something other than an ECHOREPLY */
1850                 if (!(options & F_VERBOSE))
1851                         return;
1852                 (void)printf("%d bytes from %s: ", cc, pr_addr(from, fromlen));
1853                 pr_icmph(icp, end);
1854         }
1855
1856         if (!(options & F_FLOOD)) {
1857                 (void)putchar('\n');
1858                 if (options & F_VERBOSE)
1859                         pr_exthdrs(mhdr);
1860                 (void)fflush(stdout);
1861         }
1862 #undef safeputc
1863 }
1864
1865 static void
1866 pr_exthdrs(struct msghdr *mhdr)
1867 {
1868         ssize_t bufsize;
1869         void    *bufp;
1870         struct cmsghdr *cm;
1871
1872         bufsize = 0;
1873         bufp = mhdr->msg_control;
1874         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1875              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1876                 if (cm->cmsg_level != IPPROTO_IPV6)
1877                         continue;
1878
1879                 bufsize = CONTROLLEN - ((caddr_t)CMSG_DATA(cm) - (caddr_t)bufp);
1880                 if (bufsize <= 0)
1881                         continue;
1882                 switch (cm->cmsg_type) {
1883                 case IPV6_HOPOPTS:
1884                         printf("  HbH Options: ");
1885                         pr_ip6opt(CMSG_DATA(cm), (size_t)bufsize);
1886                         break;
1887                 case IPV6_DSTOPTS:
1888 #ifdef IPV6_RTHDRDSTOPTS
1889                 case IPV6_RTHDRDSTOPTS:
1890 #endif
1891                         printf("  Dst Options: ");
1892                         pr_ip6opt(CMSG_DATA(cm), (size_t)bufsize);
1893                         break;
1894                 case IPV6_RTHDR:
1895                         printf("  Routing: ");
1896                         pr_rthdr(CMSG_DATA(cm), (size_t)bufsize);
1897                         break;
1898                 }
1899         }
1900 }
1901
1902 static void
1903 pr_ip6opt(void *extbuf, size_t bufsize)
1904 {
1905         struct ip6_hbh *ext;
1906         int currentlen;
1907         u_int8_t type;
1908         socklen_t extlen, len;
1909         void *databuf;
1910         size_t offset;
1911         u_int16_t value2;
1912         u_int32_t value4;
1913
1914         ext = (struct ip6_hbh *)extbuf;
1915         extlen = (ext->ip6h_len + 1) * 8;
1916         printf("nxt %u, len %u (%lu bytes)\n", ext->ip6h_nxt,
1917             (unsigned int)ext->ip6h_len, (unsigned long)extlen);
1918
1919         /*
1920          * Bounds checking on the ancillary data buffer:
1921          *     subtract the size of a cmsg structure from the buffer size.
1922          */
1923         if (bufsize < (extlen  + CMSG_SPACE(0))) {
1924                 extlen = bufsize - CMSG_SPACE(0);
1925                 warnx("options truncated, showing only %u (total=%u)",
1926                     (unsigned int)(extlen / 8 - 1),
1927                     (unsigned int)(ext->ip6h_len));
1928         }
1929
1930         currentlen = 0;
1931         while (1) {
1932                 currentlen = inet6_opt_next(extbuf, extlen, currentlen,
1933                     &type, &len, &databuf);
1934                 if (currentlen == -1)
1935                         break;
1936                 switch (type) {
1937                 /*
1938                  * Note that inet6_opt_next automatically skips any padding
1939                  * optins.
1940                  */
1941                 case IP6OPT_JUMBO:
1942                         offset = 0;
1943                         offset = inet6_opt_get_val(databuf, offset,
1944                             &value4, sizeof(value4));
1945                         printf("    Jumbo Payload Opt: Length %u\n",
1946                             (u_int32_t)ntohl(value4));
1947                         break;
1948                 case IP6OPT_ROUTER_ALERT:
1949                         offset = 0;
1950                         offset = inet6_opt_get_val(databuf, offset,
1951                                                    &value2, sizeof(value2));
1952                         printf("    Router Alert Opt: Type %u\n",
1953                             ntohs(value2));
1954                         break;
1955                 default:
1956                         printf("    Received Opt %u len %lu\n",
1957                             type, (unsigned long)len);
1958                         break;
1959                 }
1960         }
1961         return;
1962 }
1963
1964 static void
1965 pr_rthdr(void *extbuf, size_t bufsize)
1966 {
1967         struct in6_addr *in6;
1968         char ntopbuf[INET6_ADDRSTRLEN];
1969         struct ip6_rthdr *rh = (struct ip6_rthdr *)extbuf;
1970         int i, segments, origsegs, rthsize, size0, size1;
1971
1972         /* print fixed part of the header */
1973         printf("nxt %u, len %u (%d bytes), type %u, ", rh->ip6r_nxt,
1974             rh->ip6r_len, (rh->ip6r_len + 1) << 3, rh->ip6r_type);
1975         if ((segments = inet6_rth_segments(extbuf)) >= 0) {
1976                 printf("%d segments, ", segments);
1977                 printf("%d left\n", rh->ip6r_segleft);
1978         } else {
1979                 printf("segments unknown, ");
1980                 printf("%d left\n", rh->ip6r_segleft);
1981                 return;
1982         }
1983
1984         /*
1985          * Bounds checking on the ancillary data buffer. When calculating
1986          * the number of items to show keep in mind:
1987          *      - The size of the cmsg structure
1988          *      - The size of one segment (the size of a Type 0 routing header)
1989          *      - When dividing add a fudge factor of one in case the
1990          *        dividend is not evenly divisible by the divisor
1991          */
1992         rthsize = (rh->ip6r_len + 1) * 8;
1993         if (bufsize < (rthsize + CMSG_SPACE(0))) {
1994                 origsegs = segments;
1995                 size0 = inet6_rth_space(IPV6_RTHDR_TYPE_0, 0);
1996                 size1 = inet6_rth_space(IPV6_RTHDR_TYPE_0, 1);
1997                 segments -= (rthsize - (bufsize - CMSG_SPACE(0))) /
1998                     (size1 - size0) + 1;
1999                 warnx("segments truncated, showing only %d (total=%d)",
2000                     segments, origsegs);
2001         }
2002
2003         for (i = 0; i < segments; i++) {
2004                 in6 = inet6_rth_getaddr(extbuf, i);
2005                 if (in6 == NULL)
2006                         printf("   [%d]<NULL>\n", i);
2007                 else {
2008                         if (!inet_ntop(AF_INET6, in6, ntopbuf,
2009                             sizeof(ntopbuf)))
2010                                 strlcpy(ntopbuf, "?", sizeof(ntopbuf));
2011                         printf("   [%d]%s\n", i, ntopbuf);
2012                 }
2013         }
2014
2015         return;
2016
2017 }
2018
2019 static int
2020 pr_bitrange(u_int32_t v, int soff, int ii)
2021 {
2022         int off;
2023         int i;
2024
2025         off = 0;
2026         while (off < 32) {
2027                 /* shift till we have 0x01 */
2028                 if ((v & 0x01) == 0) {
2029                         if (ii > 1)
2030                                 printf("-%u", soff + off - 1);
2031                         ii = 0;
2032                         switch (v & 0x0f) {
2033                         case 0x00:
2034                                 v >>= 4;
2035                                 off += 4;
2036                                 continue;
2037                         case 0x08:
2038                                 v >>= 3;
2039                                 off += 3;
2040                                 continue;
2041                         case 0x04: case 0x0c:
2042                                 v >>= 2;
2043                                 off += 2;
2044                                 continue;
2045                         default:
2046                                 v >>= 1;
2047                                 off += 1;
2048                                 continue;
2049                         }
2050                 }
2051
2052                 /* we have 0x01 with us */
2053                 for (i = 0; i < 32 - off; i++) {
2054                         if ((v & (0x01 << i)) == 0)
2055                                 break;
2056                 }
2057                 if (!ii)
2058                         printf(" %u", soff + off);
2059                 ii += i;
2060                 v >>= i; off += i;
2061         }
2062         return ii;
2063 }
2064
2065 static void
2066 pr_suptypes(struct icmp6_nodeinfo *ni, size_t nilen)
2067         /* ni->qtype must be SUPTYPES */
2068 {
2069         size_t clen;
2070         u_int32_t v;
2071         const u_char *cp, *end;
2072         u_int16_t cur;
2073         struct cbit {
2074                 u_int16_t words;        /*32bit count*/
2075                 u_int16_t skip;
2076         } cbit;
2077 #define MAXQTYPES       (1 << 16)
2078         size_t off;
2079         int b;
2080
2081         cp = (u_char *)(ni + 1);
2082         end = ((u_char *)ni) + nilen;
2083         cur = 0;
2084         b = 0;
2085
2086         printf("NodeInfo Supported Qtypes");
2087         if (options & F_VERBOSE) {
2088                 if (ni->ni_flags & NI_SUPTYPE_FLAG_COMPRESS)
2089                         printf(", compressed bitmap");
2090                 else
2091                         printf(", raw bitmap");
2092         }
2093
2094         while (cp < end) {
2095                 clen = (size_t)(end - cp);
2096                 if ((ni->ni_flags & NI_SUPTYPE_FLAG_COMPRESS) == 0) {
2097                         if (clen == 0 || clen > MAXQTYPES / 8 ||
2098                             clen % sizeof(v)) {
2099                                 printf("???");
2100                                 return;
2101                         }
2102                 } else {
2103                         if (clen < sizeof(cbit) || clen % sizeof(v))
2104                                 return;
2105                         memcpy(&cbit, cp, sizeof(cbit));
2106                         if (sizeof(cbit) + ntohs(cbit.words) * sizeof(v) >
2107                             clen)
2108                                 return;
2109                         cp += sizeof(cbit);
2110                         clen = ntohs(cbit.words) * sizeof(v);
2111                         if (cur + clen * 8 + (u_long)ntohs(cbit.skip) * 32 >
2112                             MAXQTYPES)
2113                                 return;
2114                 }
2115
2116                 for (off = 0; off < clen; off += sizeof(v)) {
2117                         memcpy(&v, cp + off, sizeof(v));
2118                         v = (u_int32_t)ntohl(v);
2119                         b = pr_bitrange(v, (int)(cur + off * 8), b);
2120                 }
2121                 /* flush the remaining bits */
2122                 b = pr_bitrange(0, (int)(cur + off * 8), b);
2123
2124                 cp += clen;
2125                 cur += clen * 8;
2126                 if ((ni->ni_flags & NI_SUPTYPE_FLAG_COMPRESS) != 0)
2127                         cur += ntohs(cbit.skip) * 32;
2128         }
2129 }
2130
2131 static void
2132 pr_nodeaddr(struct icmp6_nodeinfo *ni, int nilen)
2133         /* ni->qtype must be NODEADDR */
2134 {
2135         u_char *cp = (u_char *)(ni + 1);
2136         char ntop_buf[INET6_ADDRSTRLEN];
2137         int withttl = 0;
2138
2139         nilen -= sizeof(struct icmp6_nodeinfo);
2140
2141         if (options & F_VERBOSE) {
2142                 switch (ni->ni_code) {
2143                 case ICMP6_NI_REFUSED:
2144                         (void)printf("refused");
2145                         break;
2146                 case ICMP6_NI_UNKNOWN:
2147                         (void)printf("unknown qtype");
2148                         break;
2149                 }
2150                 if (ni->ni_flags & NI_NODEADDR_FLAG_TRUNCATE)
2151                         (void)printf(" truncated");
2152         }
2153         putchar('\n');
2154         if (nilen <= 0)
2155                 printf("  no address\n");
2156
2157         /*
2158          * In icmp-name-lookups 05 and later, TTL of each returned address
2159          * is contained in the resposne. We try to detect the version
2160          * by the length of the data, but note that the detection algorithm
2161          * is incomplete. We assume the latest draft by default.
2162          */
2163         if (nilen % (sizeof(u_int32_t) + sizeof(struct in6_addr)) == 0)
2164                 withttl = 1;
2165         while (nilen > 0) {
2166                 u_int32_t ttl = 0;
2167
2168                 if (withttl) {
2169                         uint32_t t;
2170
2171                         memcpy(&t, cp, sizeof(t));
2172                         ttl = (u_int32_t)ntohl(t);
2173                         cp += sizeof(u_int32_t);
2174                         nilen -= sizeof(u_int32_t);
2175                 }
2176
2177                 if (inet_ntop(AF_INET6, cp, ntop_buf, sizeof(ntop_buf)) ==
2178                     NULL)
2179                         strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2180                 printf("  %s", ntop_buf);
2181                 if (withttl) {
2182                         if (ttl == 0xffffffff) {
2183                                 /*
2184                                  * XXX: can this convention be applied to all
2185                                  * type of TTL (i.e. non-ND TTL)?
2186                                  */
2187                                 printf("(TTL=infty)");
2188                         }
2189                         else
2190                                 printf("(TTL=%u)", ttl);
2191                 }
2192                 putchar('\n');
2193
2194                 nilen -= sizeof(struct in6_addr);
2195                 cp += sizeof(struct in6_addr);
2196         }
2197 }
2198
2199 static int
2200 get_hoplim(struct msghdr *mhdr)
2201 {
2202         struct cmsghdr *cm;
2203
2204         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
2205              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
2206                 if (cm->cmsg_len == 0)
2207                         return(-1);
2208
2209                 if (cm->cmsg_level == IPPROTO_IPV6 &&
2210                     cm->cmsg_type == IPV6_HOPLIMIT &&
2211                     cm->cmsg_len == CMSG_LEN(sizeof(int))) {
2212                         int r;
2213
2214                         memcpy(&r, CMSG_DATA(cm), sizeof(r));
2215                         return(r);
2216                 }
2217         }
2218
2219         return(-1);
2220 }
2221
2222 static struct in6_pktinfo *
2223 get_rcvpktinfo(struct msghdr *mhdr)
2224 {
2225         static struct in6_pktinfo pi;
2226         struct cmsghdr *cm;
2227
2228         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
2229              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
2230                 if (cm->cmsg_len == 0)
2231                         return(NULL);
2232
2233                 if (cm->cmsg_level == IPPROTO_IPV6 &&
2234                     cm->cmsg_type == IPV6_PKTINFO &&
2235                     cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
2236                         memcpy(&pi, CMSG_DATA(cm), sizeof(pi));
2237                         return(&pi);
2238                 }
2239         }
2240
2241         return(NULL);
2242 }
2243
2244 static int
2245 get_pathmtu(struct msghdr *mhdr)
2246 {
2247 #ifdef IPV6_RECVPATHMTU
2248         struct cmsghdr *cm;
2249         struct ip6_mtuinfo mtuctl;
2250
2251         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
2252              cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
2253                 if (cm->cmsg_len == 0)
2254                         return(0);
2255
2256                 if (cm->cmsg_level == IPPROTO_IPV6 &&
2257                     cm->cmsg_type == IPV6_PATHMTU &&
2258                     cm->cmsg_len == CMSG_LEN(sizeof(struct ip6_mtuinfo))) {
2259                         memcpy(&mtuctl, CMSG_DATA(cm), sizeof(mtuctl));
2260
2261                         /*
2262                          * If the notified destination is different from
2263                          * the one we are pinging, just ignore the info.
2264                          * We check the scope ID only when both notified value
2265                          * and our own value have non-0 values, because we may
2266                          * have used the default scope zone ID for sending,
2267                          * in which case the scope ID value is 0.
2268                          */
2269                         if (!IN6_ARE_ADDR_EQUAL(&mtuctl.ip6m_addr.sin6_addr,
2270                                                 &dst.sin6_addr) ||
2271                             (mtuctl.ip6m_addr.sin6_scope_id &&
2272                              dst.sin6_scope_id &&
2273                              mtuctl.ip6m_addr.sin6_scope_id !=
2274                              dst.sin6_scope_id)) {
2275                                 if ((options & F_VERBOSE) != 0) {
2276                                         printf("path MTU for %s is notified. "
2277                                                "(ignored)\n",
2278                                            pr_addr((struct sockaddr *)&mtuctl.ip6m_addr,
2279                                            sizeof(mtuctl.ip6m_addr)));
2280                                 }
2281                                 return(0);
2282                         }
2283
2284                         /*
2285                          * Ignore an invalid MTU. XXX: can we just believe
2286                          * the kernel check?
2287                          */
2288                         if (mtuctl.ip6m_mtu < IPV6_MMTU)
2289                                 return(0);
2290
2291                         /* notification for our destination. return the MTU. */
2292                         return((int)mtuctl.ip6m_mtu);
2293                 }
2294         }
2295 #endif
2296         return(0);
2297 }
2298
2299 /*
2300  * onint --
2301  *      SIGINT handler.
2302  */
2303 /* ARGSUSED */
2304 static void
2305 onint(int notused __unused)
2306 {
2307         /*
2308          * When doing reverse DNS lookups, the seenint flag might not
2309          * be noticed for a while.  Just exit if we get a second SIGINT.
2310          */
2311         if ((options & F_HOSTNAME) && seenint != 0)
2312                 _exit(nreceived ? 0 : 2);
2313 }
2314
2315 /*
2316  * summary --
2317  *      Print out statistics.
2318  */
2319 static void
2320 summary(void)
2321 {
2322
2323         (void)printf("\n--- %s ping6 statistics ---\n", hostname);
2324         (void)printf("%ld packets transmitted, ", ntransmitted);
2325         (void)printf("%ld packets received, ", nreceived);
2326         if (nrepeats)
2327                 (void)printf("+%ld duplicates, ", nrepeats);
2328         if (ntransmitted) {
2329                 if (nreceived > ntransmitted)
2330                         (void)printf("-- somebody's duplicating packets!");
2331                 else
2332                         (void)printf("%.1f%% packet loss",
2333                             ((((double)ntransmitted - nreceived) * 100.0) /
2334                             ntransmitted));
2335         }
2336         if (nrcvtimeout)
2337                 printf(", %ld packets out of wait time", nrcvtimeout);
2338         (void)putchar('\n');
2339         if (nreceived && timing) {
2340                 /* Only display average to microseconds */
2341                 double num = nreceived + nrepeats;
2342                 double avg = tsum / num;
2343                 double dev = sqrt(tsumsq / num - avg * avg);
2344                 (void)printf(
2345                     "round-trip min/avg/max/std-dev = %.3f/%.3f/%.3f/%.3f ms\n",
2346                     tmin, avg, tmax, dev);
2347                 (void)fflush(stdout);
2348         }
2349         (void)fflush(stdout);
2350 }
2351
2352 /*subject type*/
2353 static const char *niqcode[] = {
2354         "IPv6 address",
2355         "DNS label",    /*or empty*/
2356         "IPv4 address",
2357 };
2358
2359 /*result code*/
2360 static const char *nircode[] = {
2361         "Success", "Refused", "Unknown",
2362 };
2363
2364
2365 /*
2366  * pr_icmph --
2367  *      Print a descriptive string about an ICMP header.
2368  */
2369 static void
2370 pr_icmph(struct icmp6_hdr *icp, u_char *end)
2371 {
2372         char ntop_buf[INET6_ADDRSTRLEN];
2373         struct nd_redirect *red;
2374         struct icmp6_nodeinfo *ni;
2375         char dnsname[MAXDNAME + 1];
2376         const u_char *cp;
2377         size_t l;
2378
2379         switch (icp->icmp6_type) {
2380         case ICMP6_DST_UNREACH:
2381                 switch (icp->icmp6_code) {
2382                 case ICMP6_DST_UNREACH_NOROUTE:
2383                         (void)printf("No Route to Destination\n");
2384                         break;
2385                 case ICMP6_DST_UNREACH_ADMIN:
2386                         (void)printf("Destination Administratively "
2387                             "Unreachable\n");
2388                         break;
2389                 case ICMP6_DST_UNREACH_BEYONDSCOPE:
2390                         (void)printf("Destination Unreachable Beyond Scope\n");
2391                         break;
2392                 case ICMP6_DST_UNREACH_ADDR:
2393                         (void)printf("Destination Host Unreachable\n");
2394                         break;
2395                 case ICMP6_DST_UNREACH_NOPORT:
2396                         (void)printf("Destination Port Unreachable\n");
2397                         break;
2398                 default:
2399                         (void)printf("Destination Unreachable, Bad Code: %d\n",
2400                             icp->icmp6_code);
2401                         break;
2402                 }
2403                 /* Print returned IP header information */
2404                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2405                 break;
2406         case ICMP6_PACKET_TOO_BIG:
2407                 (void)printf("Packet too big mtu = %d\n",
2408                     (int)ntohl(icp->icmp6_mtu));
2409                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2410                 break;
2411         case ICMP6_TIME_EXCEEDED:
2412                 switch (icp->icmp6_code) {
2413                 case ICMP6_TIME_EXCEED_TRANSIT:
2414                         (void)printf("Time to live exceeded\n");
2415                         break;
2416                 case ICMP6_TIME_EXCEED_REASSEMBLY:
2417                         (void)printf("Frag reassembly time exceeded\n");
2418                         break;
2419                 default:
2420                         (void)printf("Time exceeded, Bad Code: %d\n",
2421                             icp->icmp6_code);
2422                         break;
2423                 }
2424                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2425                 break;
2426         case ICMP6_PARAM_PROB:
2427                 (void)printf("Parameter problem: ");
2428                 switch (icp->icmp6_code) {
2429                 case ICMP6_PARAMPROB_HEADER:
2430                         (void)printf("Erroneous Header ");
2431                         break;
2432                 case ICMP6_PARAMPROB_NEXTHEADER:
2433                         (void)printf("Unknown Nextheader ");
2434                         break;
2435                 case ICMP6_PARAMPROB_OPTION:
2436                         (void)printf("Unrecognized Option ");
2437                         break;
2438                 default:
2439                         (void)printf("Bad code(%d) ", icp->icmp6_code);
2440                         break;
2441                 }
2442                 (void)printf("pointer = 0x%02x\n",
2443                     (u_int32_t)ntohl(icp->icmp6_pptr));
2444                 pr_retip((struct ip6_hdr *)(icp + 1), end);
2445                 break;
2446         case ICMP6_ECHO_REQUEST:
2447                 (void)printf("Echo Request");
2448                 /* XXX ID + Seq + Data */
2449                 break;
2450         case ICMP6_ECHO_REPLY:
2451                 (void)printf("Echo Reply");
2452                 /* XXX ID + Seq + Data */
2453                 break;
2454         case ICMP6_MEMBERSHIP_QUERY:
2455                 (void)printf("Listener Query");
2456                 break;
2457         case ICMP6_MEMBERSHIP_REPORT:
2458                 (void)printf("Listener Report");
2459                 break;
2460         case ICMP6_MEMBERSHIP_REDUCTION:
2461                 (void)printf("Listener Done");
2462                 break;
2463         case ND_ROUTER_SOLICIT:
2464                 (void)printf("Router Solicitation");
2465                 break;
2466         case ND_ROUTER_ADVERT:
2467                 (void)printf("Router Advertisement");
2468                 break;
2469         case ND_NEIGHBOR_SOLICIT:
2470                 (void)printf("Neighbor Solicitation");
2471                 break;
2472         case ND_NEIGHBOR_ADVERT:
2473                 (void)printf("Neighbor Advertisement");
2474                 break;
2475         case ND_REDIRECT:
2476                 red = (struct nd_redirect *)icp;
2477                 (void)printf("Redirect\n");
2478                 if (!inet_ntop(AF_INET6, &red->nd_rd_dst, ntop_buf,
2479                     sizeof(ntop_buf)))
2480                         strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2481                 (void)printf("Destination: %s", ntop_buf);
2482                 if (!inet_ntop(AF_INET6, &red->nd_rd_target, ntop_buf,
2483                     sizeof(ntop_buf)))
2484                         strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2485                 (void)printf(" New Target: %s", ntop_buf);
2486                 break;
2487         case ICMP6_NI_QUERY:
2488                 (void)printf("Node Information Query");
2489                 /* XXX ID + Seq + Data */
2490                 ni = (struct icmp6_nodeinfo *)icp;
2491                 l = end - (u_char *)(ni + 1);
2492                 printf(", ");
2493                 switch (ntohs(ni->ni_qtype)) {
2494                 case NI_QTYPE_NOOP:
2495                         (void)printf("NOOP");
2496                         break;
2497                 case NI_QTYPE_SUPTYPES:
2498                         (void)printf("Supported qtypes");
2499                         break;
2500                 case NI_QTYPE_FQDN:
2501                         (void)printf("DNS name");
2502                         break;
2503                 case NI_QTYPE_NODEADDR:
2504                         (void)printf("nodeaddr");
2505                         break;
2506                 case NI_QTYPE_IPV4ADDR:
2507                         (void)printf("IPv4 nodeaddr");
2508                         break;
2509                 default:
2510                         (void)printf("unknown qtype");
2511                         break;
2512                 }
2513                 if (options & F_VERBOSE) {
2514                         switch (ni->ni_code) {
2515                         case ICMP6_NI_SUBJ_IPV6:
2516                                 if (l == sizeof(struct in6_addr) &&
2517                                     inet_ntop(AF_INET6, ni + 1, ntop_buf,
2518                                     sizeof(ntop_buf)) != NULL) {
2519                                         (void)printf(", subject=%s(%s)",
2520                                             niqcode[ni->ni_code], ntop_buf);
2521                                 } else {
2522 #if 1
2523                                         /* backward compat to -W */
2524                                         (void)printf(", oldfqdn");
2525 #else
2526                                         (void)printf(", invalid");
2527 #endif
2528                                 }
2529                                 break;
2530                         case ICMP6_NI_SUBJ_FQDN:
2531                                 if (end == (u_char *)(ni + 1)) {
2532                                         (void)printf(", no subject");
2533                                         break;
2534                                 }
2535                                 printf(", subject=%s", niqcode[ni->ni_code]);
2536                                 cp = (const u_char *)(ni + 1);
2537                                 cp = dnsdecode(cp, end, NULL, dnsname,
2538                                     sizeof(dnsname));
2539                                 if (cp != NULL)
2540                                         printf("(%s)", dnsname);
2541                                 else
2542                                         printf("(invalid)");
2543                                 break;
2544                         case ICMP6_NI_SUBJ_IPV4:
2545                                 if (l == sizeof(struct in_addr) &&
2546                                     inet_ntop(AF_INET, ni + 1, ntop_buf,
2547                                     sizeof(ntop_buf)) != NULL) {
2548                                         (void)printf(", subject=%s(%s)",
2549                                             niqcode[ni->ni_code], ntop_buf);
2550                                 } else
2551                                         (void)printf(", invalid");
2552                                 break;
2553                         default:
2554                                 (void)printf(", invalid");
2555                                 break;
2556                         }
2557                 }
2558                 break;
2559         case ICMP6_NI_REPLY:
2560                 (void)printf("Node Information Reply");
2561                 /* XXX ID + Seq + Data */
2562                 ni = (struct icmp6_nodeinfo *)icp;
2563                 printf(", ");
2564                 switch (ntohs(ni->ni_qtype)) {
2565                 case NI_QTYPE_NOOP:
2566                         (void)printf("NOOP");
2567                         break;
2568                 case NI_QTYPE_SUPTYPES:
2569                         (void)printf("Supported qtypes");
2570                         break;
2571                 case NI_QTYPE_FQDN:
2572                         (void)printf("DNS name");
2573                         break;
2574                 case NI_QTYPE_NODEADDR:
2575                         (void)printf("nodeaddr");
2576                         break;
2577                 case NI_QTYPE_IPV4ADDR:
2578                         (void)printf("IPv4 nodeaddr");
2579                         break;
2580                 default:
2581                         (void)printf("unknown qtype");
2582                         break;
2583                 }
2584                 if (options & F_VERBOSE) {
2585                         if (ni->ni_code > nitems(nircode))
2586                                 printf(", invalid");
2587                         else
2588                                 printf(", %s", nircode[ni->ni_code]);
2589                 }
2590                 break;
2591         default:
2592                 (void)printf("Bad ICMP type: %d", icp->icmp6_type);
2593         }
2594 }
2595
2596 /*
2597  * pr_iph --
2598  *      Print an IP6 header.
2599  */
2600 static void
2601 pr_iph(struct ip6_hdr *ip6)
2602 {
2603         u_int32_t flow = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
2604         u_int8_t tc;
2605         char ntop_buf[INET6_ADDRSTRLEN];
2606
2607         tc = *(&ip6->ip6_vfc + 1); /* XXX */
2608         tc = (tc >> 4) & 0x0f;
2609         tc |= (ip6->ip6_vfc << 4);
2610
2611         printf("Vr TC  Flow Plen Nxt Hlim\n");
2612         printf(" %1x %02x %05x %04x  %02x   %02x\n",
2613             (ip6->ip6_vfc & IPV6_VERSION_MASK) >> 4, tc, (u_int32_t)ntohl(flow),
2614             ntohs(ip6->ip6_plen), ip6->ip6_nxt, ip6->ip6_hlim);
2615         if (!inet_ntop(AF_INET6, &ip6->ip6_src, ntop_buf, sizeof(ntop_buf)))
2616                 strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2617         printf("%s->", ntop_buf);
2618         if (!inet_ntop(AF_INET6, &ip6->ip6_dst, ntop_buf, sizeof(ntop_buf)))
2619                 strlcpy(ntop_buf, "?", sizeof(ntop_buf));
2620         printf("%s\n", ntop_buf);
2621 }
2622
2623 /*
2624  * pr_addr --
2625  *      Return an ascii host address as a dotted quad and optionally with
2626  * a hostname.
2627  */
2628 static const char *
2629 pr_addr(struct sockaddr *addr, int addrlen)
2630 {
2631         static char buf[NI_MAXHOST];
2632         int flag = 0;
2633
2634         if ((options & F_HOSTNAME) == 0)
2635                 flag |= NI_NUMERICHOST;
2636
2637         if (cap_getnameinfo(capdns, addr, addrlen, buf, sizeof(buf), NULL, 0,
2638                 flag) == 0)
2639                 return (buf);
2640         else
2641                 return "?";
2642 }
2643
2644 /*
2645  * pr_retip --
2646  *      Dump some info on a returned (via ICMPv6) IPv6 packet.
2647  */
2648 static void
2649 pr_retip(struct ip6_hdr *ip6, u_char *end)
2650 {
2651         u_char *cp = (u_char *)ip6, nh;
2652         int hlen;
2653
2654         if ((size_t)(end - (u_char *)ip6) < sizeof(*ip6)) {
2655                 printf("IP6");
2656                 goto trunc;
2657         }
2658         pr_iph(ip6);
2659         hlen = sizeof(*ip6);
2660
2661         nh = ip6->ip6_nxt;
2662         cp += hlen;
2663         while (end - cp >= 8) {
2664 #ifdef IPSEC
2665                 struct ah ah;
2666 #endif
2667
2668                 switch (nh) {
2669                 case IPPROTO_HOPOPTS:
2670                         printf("HBH ");
2671                         hlen = (((struct ip6_hbh *)cp)->ip6h_len+1) << 3;
2672                         nh = ((struct ip6_hbh *)cp)->ip6h_nxt;
2673                         break;
2674                 case IPPROTO_DSTOPTS:
2675                         printf("DSTOPT ");
2676                         hlen = (((struct ip6_dest *)cp)->ip6d_len+1) << 3;
2677                         nh = ((struct ip6_dest *)cp)->ip6d_nxt;
2678                         break;
2679                 case IPPROTO_FRAGMENT:
2680                         printf("FRAG ");
2681                         hlen = sizeof(struct ip6_frag);
2682                         nh = ((struct ip6_frag *)cp)->ip6f_nxt;
2683                         break;
2684                 case IPPROTO_ROUTING:
2685                         printf("RTHDR ");
2686                         hlen = (((struct ip6_rthdr *)cp)->ip6r_len+1) << 3;
2687                         nh = ((struct ip6_rthdr *)cp)->ip6r_nxt;
2688                         break;
2689 #ifdef IPSEC
2690                 case IPPROTO_AH:
2691                         printf("AH ");
2692                         memcpy(&ah, cp, sizeof(ah));
2693                         hlen = (ah.ah_len+2) << 2;
2694                         nh = ah.ah_nxt;
2695                         break;
2696 #endif
2697                 case IPPROTO_ICMPV6:
2698                         printf("ICMP6: type = %d, code = %d\n",
2699                             *cp, *(cp + 1));
2700                         return;
2701                 case IPPROTO_ESP:
2702                         printf("ESP\n");
2703                         return;
2704                 case IPPROTO_TCP:
2705                         printf("TCP: from port %u, to port %u (decimal)\n",
2706                             (*cp * 256 + *(cp + 1)),
2707                             (*(cp + 2) * 256 + *(cp + 3)));
2708                         return;
2709                 case IPPROTO_UDP:
2710                         printf("UDP: from port %u, to port %u (decimal)\n",
2711                             (*cp * 256 + *(cp + 1)),
2712                             (*(cp + 2) * 256 + *(cp + 3)));
2713                         return;
2714                 default:
2715                         printf("Unknown Header(%d)\n", nh);
2716                         return;
2717                 }
2718
2719                 if ((cp += hlen) >= end)
2720                         goto trunc;
2721         }
2722         if (end - cp < 8)
2723                 goto trunc;
2724
2725         putchar('\n');
2726         return;
2727
2728   trunc:
2729         printf("...\n");
2730         return;
2731 }
2732
2733 static void
2734 fill(char *bp, char *patp)
2735 {
2736         int ii, jj, kk;
2737         int pat[16];
2738         char *cp;
2739
2740         for (cp = patp; *cp; cp++)
2741                 if (!isxdigit(*cp))
2742                         errx(1, "patterns must be specified as hex digits");
2743         ii = sscanf(patp,
2744             "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
2745             &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
2746             &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
2747             &pat[13], &pat[14], &pat[15]);
2748
2749 /* xxx */
2750         if (ii > 0)
2751                 for (kk = 0;
2752                     (size_t)kk <= MAXDATALEN - 8 + sizeof(struct tv32) + ii;
2753                     kk += ii)
2754                         for (jj = 0; jj < ii; ++jj)
2755                                 bp[jj + kk] = pat[jj];
2756         if (!(options & F_QUIET)) {
2757                 (void)printf("PATTERN: 0x");
2758                 for (jj = 0; jj < ii; ++jj)
2759                         (void)printf("%02x", bp[jj] & 0xFF);
2760                 (void)printf("\n");
2761         }
2762 }
2763
2764 #ifdef IPSEC
2765 #ifdef IPSEC_POLICY_IPSEC
2766 static int
2767 setpolicy(int so __unused, char *policy)
2768 {
2769         char *buf;
2770
2771         if (policy == NULL)
2772                 return 0;       /* ignore */
2773
2774         buf = ipsec_set_policy(policy, strlen(policy));
2775         if (buf == NULL)
2776                 errx(1, "%s", ipsec_strerror());
2777         if (setsockopt(ssend, IPPROTO_IPV6, IPV6_IPSEC_POLICY, buf,
2778             ipsec_get_policylen(buf)) < 0)
2779                 warnx("Unable to set IPsec policy");
2780         free(buf);
2781
2782         return 0;
2783 }
2784 #endif
2785 #endif
2786
2787 static char *
2788 nigroup(char *name, int nig_oldmcprefix)
2789 {
2790         char *p;
2791         char *q;
2792         MD5_CTX ctxt;
2793         u_int8_t digest[16];
2794         u_int8_t c;
2795         size_t l;
2796         char hbuf[NI_MAXHOST];
2797         struct in6_addr in6;
2798         int valid;
2799
2800         p = strchr(name, '.');
2801         if (!p)
2802                 p = name + strlen(name);
2803         l = p - name;
2804         if (l > 63 || l > sizeof(hbuf) - 1)
2805                 return NULL;    /*label too long*/
2806         strncpy(hbuf, name, l);
2807         hbuf[(int)l] = '\0';
2808
2809         for (q = name; *q; q++) {
2810                 if (isupper(*(unsigned char *)q))
2811                         *q = tolower(*(unsigned char *)q);
2812         }
2813
2814         /* generate 16 bytes of pseudo-random value. */
2815         memset(&ctxt, 0, sizeof(ctxt));
2816         MD5Init(&ctxt);
2817         c = l & 0xff;
2818         MD5Update(&ctxt, &c, sizeof(c));
2819         MD5Update(&ctxt, (unsigned char *)name, l);
2820         MD5Final(digest, &ctxt);
2821
2822         if (nig_oldmcprefix) {
2823                 /* draft-ietf-ipngwg-icmp-name-lookup */
2824                 valid = inet_pton(AF_INET6, "ff02::2:0000:0000", &in6);
2825         } else {
2826                 /* RFC 4620 */
2827                 valid = inet_pton(AF_INET6, "ff02::2:ff00:0000", &in6);
2828         }
2829         if (valid != 1)
2830                 return NULL;    /*XXX*/
2831
2832         if (nig_oldmcprefix) {
2833                 /* draft-ietf-ipngwg-icmp-name-lookup */
2834                 bcopy(digest, &in6.s6_addr[12], 4);
2835         } else {
2836                 /* RFC 4620 */
2837                 bcopy(digest, &in6.s6_addr[13], 3);
2838         }
2839
2840         if (inet_ntop(AF_INET6, &in6, hbuf, sizeof(hbuf)) == NULL)
2841                 return NULL;
2842
2843         return strdup(hbuf);
2844 }
2845
2846 static cap_channel_t *
2847 capdns_setup(void)
2848 {
2849         cap_channel_t *capcas, *capdnsloc;
2850 #ifdef WITH_CASPER
2851         const char *types[2];
2852         int families[1];
2853 #endif
2854         capcas = cap_init();
2855         if (capcas == NULL)
2856                 err(1, "unable to create casper process");
2857         capdnsloc = cap_service_open(capcas, "system.dns");
2858         /* Casper capability no longer needed. */
2859         cap_close(capcas);
2860         if (capdnsloc == NULL)
2861                 err(1, "unable to open system.dns service");
2862 #ifdef WITH_CASPER
2863         types[0] = "NAME2ADDR";
2864         types[1] = "ADDR2NAME";
2865         if (cap_dns_type_limit(capdnsloc, types, nitems(types)) < 0)
2866                 err(1, "unable to limit access to system.dns service");
2867         families[0] = AF_INET6;
2868         if (cap_dns_family_limit(capdnsloc, families, nitems(families)) < 0)
2869                 err(1, "unable to limit access to system.dns service");
2870 #endif
2871         return (capdnsloc);
2872 }