sbin/route/route.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1983, 1989, 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1983, 1989, 1991, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)route.c     8.6 (Berkeley) 4/28/95";
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 #include <sys/param.h>
  48 #include <sys/file.h>
  49 #include <sys/socket.h>
  50 #include <sys/ioctl.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/types.h>
  53 #include <sys/queue.h>
  54
  55 #include <net/if.h>
  56 #include <net/route.h>
  57 #include <net/if_dl.h>
  58 #include <netinet/in.h>
  59 #include <netinet/if_ether.h>
  60 #include <arpa/inet.h>
  61 #include <netdb.h>
  62
  63 #include <ctype.h>
  64 #include <err.h>
  65 #include <errno.h>
  66 #include <paths.h>
  67 #include <signal.h>
  68 #include <stdbool.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <sysexits.h>
  73 #include <time.h>
  74 #include <unistd.h>
  75 #include <ifaddrs.h>
  76
  77 struct fibl {
  78         TAILQ_ENTRY(fibl)       fl_next;
  79
  80         int     fl_num;
  81         int     fl_error;
  82         int     fl_errno;
  83 };
  84
  85 static struct keytab {
  86         const char      *kt_cp;
  87         int     kt_i;
  88 } const keywords[] = {
  89 #include "keywords.h"
  90         {0, 0}
  91 };
  92
  93 static struct sockaddr_storage so[RTAX_MAX];
  94 static int      pid, rtm_addrs;
  95 static int      s;
  96 static int      nflag, af, qflag, tflag;
  97 static int      verbose, aflen;
  98 static int      locking, lockrest, debugonly;
  99 static struct rt_metrics rt_metrics;
 100 static u_long  rtm_inits;
 101 static uid_t    uid;
 102 static int      defaultfib;
 103 static int      numfibs;
 104 static char     domain[MAXHOSTNAMELEN + 1];
 105 static bool     domain_initialized;
 106 static int      rtm_seq;
 107 static char     rt_line[NI_MAXHOST];
 108 static char     net_line[MAXHOSTNAMELEN + 1];
 109
 110 static struct {
 111         struct  rt_msghdr m_rtm;
 112         char    m_space[512];
 113 } m_rtmsg;
 114
 115 static TAILQ_HEAD(fibl_head_t, fibl) fibl_head;
 116
 117 static void     printb(int, const char *);
 118 static void     flushroutes(int argc, char *argv[]);
 119 static int      flushroutes_fib(int);
 120 static int      getaddr(int, char *, struct hostent **, int);
 121 static int      keyword(const char *);
 122 #ifdef INET
 123 static void     inet_makenetandmask(u_long, struct sockaddr_in *,
 124                     struct sockaddr_in *, u_long);
 125 #endif
 126 #ifdef INET6
 127 static int      inet6_makenetandmask(struct sockaddr_in6 *, const char *);
 128 #endif
 129 static void     interfaces(void);
 130 static void     monitor(int, char*[]);
 131 static const char       *netname(struct sockaddr *);
 132 static void     newroute(int, char **);
 133 static int      newroute_fib(int, char *, int);
 134 static void     pmsg_addrs(char *, int, size_t);
 135 static void     pmsg_common(struct rt_msghdr *, size_t);
 136 static int      prefixlen(const char *);
 137 static void     print_getmsg(struct rt_msghdr *, int, int);
 138 static void     print_rtmsg(struct rt_msghdr *, size_t);
 139 static const char       *routename(struct sockaddr *);
 140 static int      rtmsg(int, int, int);
 141 static void     set_metric(char *, int);
 142 static int      set_sofib(int);
 143 static void     sockaddr(char *, struct sockaddr *, size_t);
 144 static void     sodump(struct sockaddr *, const char *);
 145 static int      fiboptlist_csv(const char *, struct fibl_head_t *);
 146 static int      fiboptlist_range(const char *, struct fibl_head_t *);
 147
 148 static void usage(const char *) __dead2;
 149
 150 #define READ_TIMEOUT    10
 151 static volatile sig_atomic_t stop_read;
 152
 153 static void
 154 stopit(int sig __unused)
 155 {
 156
 157         stop_read = 1;
 158 }
 159
 160 static void
 161 usage(const char *cp)
 162 {
 163         if (cp != NULL)
 164                 warnx("bad keyword: %s", cp);
 165         errx(EX_USAGE, "usage: route [-46dnqtv] command [[modifiers] args]");
 166         /* NOTREACHED */
 167 }
 168
 169 int
 170 main(int argc, char **argv)
 171 {
 172         int ch;
 173         size_t len;
 174
 175         if (argc < 2)
 176                 usage(NULL);
 177
 178         while ((ch = getopt(argc, argv, "46nqdtv")) != -1)
 179                 switch(ch) {
 180                 case '4':
 181 #ifdef INET
 182                         af = AF_INET;
 183                         aflen = sizeof(struct sockaddr_in);
 184 #else
 185                         errx(1, "IPv4 support is not compiled in");
 186 #endif
 187                         break;
 188                 case '6':
 189 #ifdef INET6
 190                         af = AF_INET6;
 191                         aflen = sizeof(struct sockaddr_in6);
 192 #else
 193                         errx(1, "IPv6 support is not compiled in");
 194 #endif
 195                         break;
 196                 case 'n':
 197                         nflag = 1;
 198                         break;
 199                 case 'q':
 200                         qflag = 1;
 201                         break;
 202                 case 'v':
 203                         verbose = 1;
 204                         break;
 205                 case 't':
 206                         tflag = 1;
 207                         break;
 208                 case 'd':
 209                         debugonly = 1;
 210                         break;
 211                 case '?':
 212                 default:
 213                         usage(NULL);
 214                 }
 215         argc -= optind;
 216         argv += optind;
 217
 218         pid = getpid();
 219         uid = geteuid();
 220         if (tflag)
 221                 s = open(_PATH_DEVNULL, O_WRONLY, 0);
 222         else
 223                 s = socket(PF_ROUTE, SOCK_RAW, 0);
 224         if (s < 0)
 225                 err(EX_OSERR, "socket");
 226
 227         len = sizeof(numfibs);
 228         if (sysctlbyname("net.fibs", (void *)&numfibs, &len, NULL, 0) == -1)
 229                 numfibs = -1;
 230
 231         len = sizeof(defaultfib);
 232         if (numfibs != -1 &&
 233             sysctlbyname("net.my_fibnum", (void *)&defaultfib, &len, NULL,
 234                 0) == -1)
 235                 defaultfib = -1;
 236
 237         if (*argv != NULL)
 238                 switch (keyword(*argv)) {
 239                 case K_GET:
 240                 case K_SHOW:
 241                         uid = 0;
 242                         /* FALLTHROUGH */
 243
 244                 case K_CHANGE:
 245                 case K_ADD:
 246                 case K_DEL:
 247                 case K_DELETE:
 248                         newroute(argc, argv);
 249                         /* NOTREACHED */
 250
 251                 case K_MONITOR:
 252                         monitor(argc, argv);
 253                         /* NOTREACHED */
 254
 255                 case K_FLUSH:
 256                         flushroutes(argc, argv);
 257                         exit(0);
 258                         /* NOTREACHED */
 259                 }
 260         usage(*argv);
 261         /* NOTREACHED */
 262 }
 263
 264 static int
 265 set_sofib(int fib)
 266 {
 267
 268         if (fib < 0)
 269                 return (0);
 270         return (setsockopt(s, SOL_SOCKET, SO_SETFIB, (void *)&fib,
 271             sizeof(fib)));
 272 }
 273
 274 static int
 275 fiboptlist_range(const char *arg, struct fibl_head_t *flh)
 276 {
 277         struct fibl *fl;
 278         char *str0, *str, *token, *endptr;
 279         int fib[2], i, error;
 280
 281         str0 = str = strdup(arg);
 282         error = 0;
 283         i = 0;
 284         while ((token = strsep(&str, "-")) != NULL) {
 285                 switch (i) {
 286                 case 0:
 287                 case 1:
 288                         errno = 0;
 289                         fib[i] = strtol(token, &endptr, 0);
 290                         if (errno == 0) {
 291                                 if (*endptr != '\0' ||
 292                                     fib[i] < 0 ||
 293                                     (numfibs != -1 && fib[i] > numfibs - 1))
 294                                         errno = EINVAL;
 295                         }
 296                         if (errno)
 297                                 error = 1;
 298                         break;
 299                 default:
 300                         error = 1;
 301                 }
 302                 if (error)
 303                         goto fiboptlist_range_ret;
 304                 i++;
 305         }
 306         if (fib[0] >= fib[1]) {
 307                 error = 1;
 308                 goto fiboptlist_range_ret;
 309         }
 310         for (i = fib[0]; i <= fib[1]; i++) {
 311                 fl = calloc(1, sizeof(*fl));
 312                 if (fl == NULL) {
 313                         error = 1;
 314                         goto fiboptlist_range_ret;
 315                 }
 316                 fl->fl_num = i;
 317                 TAILQ_INSERT_TAIL(flh, fl, fl_next);
 318         }
 319 fiboptlist_range_ret:
 320         free(str0);
 321         return (error);
 322 }
 323
 324 #define ALLSTRLEN       64
 325 static int
 326 fiboptlist_csv(const char *arg, struct fibl_head_t *flh)
 327 {
 328         struct fibl *fl;
 329         char *str0, *str, *token, *endptr;
 330         int fib, error;
 331
 332         str0 = str = NULL;
 333         if (strcmp("all", arg) == 0) {
 334                 str = calloc(1, ALLSTRLEN);
 335                 if (str == NULL) {
 336                         error = 1;
 337                         goto fiboptlist_csv_ret;
 338                 }
 339                 if (numfibs > 1)
 340                         snprintf(str, ALLSTRLEN - 1, "%d-%d", 0, numfibs - 1);
 341                 else
 342                         snprintf(str, ALLSTRLEN - 1, "%d", 0);
 343         } else if (strcmp("default", arg) == 0) {
 344                 str0 = str = calloc(1, ALLSTRLEN);
 345                 if (str == NULL) {
 346                         error = 1;
 347                         goto fiboptlist_csv_ret;
 348                 }
 349                 snprintf(str, ALLSTRLEN - 1, "%d", defaultfib);
 350         } else
 351                 str0 = str = strdup(arg);
 352
 353         error = 0;
 354         while ((token = strsep(&str, ",")) != NULL) {
 355                 if (*token != '-' && strchr(token, '-') != NULL) {
 356                         error = fiboptlist_range(token, flh);
 357                         if (error)
 358                                 goto fiboptlist_csv_ret;
 359                 } else {
 360                         errno = 0;
 361                         fib = strtol(token, &endptr, 0);
 362                         if (errno == 0) {
 363                                 if (*endptr != '\0' ||
 364                                     fib < 0 ||
 365                                     (numfibs != -1 && fib > numfibs - 1))
 366                                         errno = EINVAL;
 367                         }
 368                         if (errno) {
 369                                 error = 1;
 370                                 goto fiboptlist_csv_ret;
 371                         }
 372                         fl = calloc(1, sizeof(*fl));
 373                         if (fl == NULL) {
 374                                 error = 1;
 375                                 goto fiboptlist_csv_ret;
 376                         }
 377                         fl->fl_num = fib;
 378                         TAILQ_INSERT_TAIL(flh, fl, fl_next);
 379                 }
 380         }
 381 fiboptlist_csv_ret:
 382         if (str0 != NULL)
 383                 free(str0);
 384         return (error);
 385 }
 386
 387 /*
 388  * Purge all entries in the routing tables not
 389  * associated with network interfaces.
 390  */
 391 static void
 392 flushroutes(int argc, char *argv[])
 393 {
 394         struct fibl *fl;
 395         int error;
 396
 397         if (uid != 0 && !debugonly && !tflag)
 398                 errx(EX_NOPERM, "must be root to alter routing table");
 399         shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 400
 401         TAILQ_INIT(&fibl_head);
 402         while (argc > 1) {
 403                 argc--;
 404                 argv++;
 405                 if (**argv != '-')
 406                         usage(*argv);
 407                 switch (keyword(*argv + 1)) {
 408 #ifdef INET
 409                 case K_4:
 410                 case K_INET:
 411                         af = AF_INET;
 412                         break;
 413 #endif
 414 #ifdef INET6
 415                 case K_6:
 416                 case K_INET6:
 417                         af = AF_INET6;
 418                         break;
 419 #endif
 420                 case K_LINK:
 421                         af = AF_LINK;
 422                         break;
 423                 case K_FIB:
 424                         if (!--argc)
 425                                 usage(*argv);
 426                         error = fiboptlist_csv(*++argv, &fibl_head);
 427                         if (error)
 428                                 errx(EX_USAGE, "invalid fib number: %s", *argv);
 429                         break;
 430                 default:
 431                         usage(*argv);
 432                 }
 433         }
 434         if (TAILQ_EMPTY(&fibl_head)) {
 435                 error = fiboptlist_csv("default", &fibl_head);
 436                 if (error)
 437                         errx(EX_OSERR, "fiboptlist_csv failed.");
 438         }
 439         TAILQ_FOREACH(fl, &fibl_head, fl_next)
 440                 flushroutes_fib(fl->fl_num);
 441 }
 442
 443 static int
 444 flushroutes_fib(int fib)
 445 {
 446         struct rt_msghdr *rtm;
 447         size_t needed;
 448         char *buf, *next, *lim;
 449         int mib[7], rlen, seqno, count = 0;
 450         int error;
 451
 452         error = set_sofib(fib);
 453         if (error) {
 454                 warn("fib number %d is ignored", fib);
 455                 return (error);
 456         }
 457
 458 retry:
 459         mib[0] = CTL_NET;
 460         mib[1] = PF_ROUTE;
 461         mib[2] = 0;             /* protocol */
 462         mib[3] = AF_UNSPEC;
 463         mib[4] = NET_RT_DUMP;
 464         mib[5] = 0;             /* no flags */
 465         mib[6] = fib;
 466         if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
 467                 err(EX_OSERR, "route-sysctl-estimate");
 468         if ((buf = malloc(needed)) == NULL)
 469                 errx(EX_OSERR, "malloc failed");
 470         if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
 471                 if (errno == ENOMEM && count++ < 10) {
 472                         warnx("Routing table grew, retrying");
 473                         sleep(1);
 474                         free(buf);
 475                         goto retry;
 476                 }
 477                 err(EX_OSERR, "route-sysctl-get");
 478         }
 479         lim = buf + needed;
 480         if (verbose)
 481                 (void)printf("Examining routing table from sysctl\n");
 482         seqno = 0;              /* ??? */
 483         for (next = buf; next < lim; next += rtm->rtm_msglen) {
 484                 rtm = (struct rt_msghdr *)(void *)next;
 485                 if (verbose)
 486                         print_rtmsg(rtm, rtm->rtm_msglen);
 487                 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
 488                         continue;
 489                 if (af != 0) {
 490                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 491
 492                         if (sa->sa_family != af)
 493                                 continue;
 494                 }
 495                 if (debugonly)
 496                         continue;
 497                 rtm->rtm_type = RTM_DELETE;
 498                 rtm->rtm_seq = seqno;
 499                 rlen = write(s, next, rtm->rtm_msglen);
 500                 if (rlen < 0 && errno == EPERM)
 501                         err(1, "write to routing socket");
 502                 if (rlen < (int)rtm->rtm_msglen) {
 503                         warn("write to routing socket");
 504                         (void)printf("got only %d for rlen\n", rlen);
 505                         free(buf);
 506                         goto retry;
 507                         break;
 508                 }
 509                 seqno++;
 510                 if (qflag)
 511                         continue;
 512                 if (verbose)
 513                         print_rtmsg(rtm, rlen);
 514                 else {
 515                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 516
 517                         printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
 518                             routename(sa) : netname(sa));
 519                         sa = (struct sockaddr *)(SA_SIZE(sa) + (char *)sa);
 520                         printf("%-20.20s ", routename(sa));
 521                         if (fib >= 0)
 522                                 printf("-fib %-3d ", fib);
 523                         printf("done\n");
 524                 }
 525         }
 526         free(buf);
 527         return (error);
 528 }
 529
 530 static const char *
 531 routename(struct sockaddr *sa)
 532 {
 533         struct sockaddr_dl *sdl;
 534         const char *cp;
 535         int n;
 536
 537         if (!domain_initialized) {
 538                 domain_initialized = true;
 539                 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
 540                     (cp = strchr(domain, '.'))) {
 541                         domain[MAXHOSTNAMELEN] = '\0';
 542                         (void)strcpy(domain, cp + 1);
 543                 } else
 544                         domain[0] = '\0';
 545         }
 546
 547         /* If the address is zero-filled, use "default". */
 548         if (sa->sa_len == 0 && nflag == 0)
 549                 return ("default");
 550 #if defined(INET) || defined(INET6)
 551         switch (sa->sa_family) {
 552 #ifdef INET
 553         case AF_INET:
 554                 /* If the address is zero-filled, use "default". */
 555                 if (nflag == 0 &&
 556                     ((struct sockaddr_in *)(void *)sa)->sin_addr.s_addr ==
 557                     INADDR_ANY)
 558                         return("default");
 559                 break;
 560 #endif
 561 #ifdef INET6
 562         case AF_INET6:
 563                 /* If the address is zero-filled, use "default". */
 564                 if (nflag == 0 &&
 565                     IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(void *)sa)->sin6_addr))
 566                         return("default");
 567                 break;
 568 #endif
 569         }
 570 #endif
 571
 572         switch (sa->sa_family) {
 573 #if defined(INET) || defined(INET6)
 574 #ifdef INET
 575         case AF_INET:
 576 #endif
 577 #ifdef INET6
 578         case AF_INET6:
 579 #endif
 580         {
 581                 struct sockaddr_storage ss;
 582                 int error;
 583                 char *p;
 584
 585                 memset(&ss, 0, sizeof(ss));
 586                 if (sa->sa_len == 0)
 587                         ss.ss_family = sa->sa_family;
 588                 else
 589                         memcpy(&ss, sa, sa->sa_len);
 590                 /* Expand sa->sa_len because it could be shortened. */
 591                 if (sa->sa_family == AF_INET)
 592                         ss.ss_len = sizeof(struct sockaddr_in);
 593                 else if (sa->sa_family == AF_INET6)
 594                         ss.ss_len = sizeof(struct sockaddr_in6);
 595                 error = getnameinfo((struct sockaddr *)&ss, ss.ss_len,
 596                     rt_line, sizeof(rt_line), NULL, 0,
 597                     (nflag == 0) ? 0 : NI_NUMERICHOST);
 598                 if (error) {
 599                         warnx("getnameinfo(): %s", gai_strerror(error));
 600                         strncpy(rt_line, "invalid", sizeof(rt_line));
 601                 }
 602
 603                 /* Remove the domain part if any. */
 604                 p = strchr(rt_line, '.');
 605                 if (p != NULL && strcmp(p + 1, domain) == 0)
 606                         *p = '\0';
 607
 608                 return (rt_line);
 609                 break;
 610         }
 611 #endif
 612         case AF_LINK:
 613                 sdl = (struct sockaddr_dl *)(void *)sa;
 614
 615                 if (sdl->sdl_nlen == 0 &&
 616                     sdl->sdl_alen == 0 &&
 617                     sdl->sdl_slen == 0) {
 618                         n = snprintf(rt_line, sizeof(rt_line), "link#%d",
 619                             sdl->sdl_index);
 620                         if (n > (int)sizeof(rt_line))
 621                             rt_line[0] = '\0';
 622                         return (rt_line);
 623                 } else
 624                         return (link_ntoa(sdl));
 625                 break;
 626
 627         default:
 628             {
 629                 u_short *sp = (u_short *)(void *)sa;
 630                 u_short *splim = sp + ((sa->sa_len + 1) >> 1);
 631                 char *cps = rt_line + sprintf(rt_line, "(%d)", sa->sa_family);
 632                 char *cpe = rt_line + sizeof(rt_line);
 633
 634                 while (++sp < splim && cps < cpe) /* start with sa->sa_data */
 635                         if ((n = snprintf(cps, cpe - cps, " %x", *sp)) > 0)
 636                                 cps += n;
 637                         else
 638                                 *cps = '\0';
 639                 break;
 640             }
 641         }
 642         return (rt_line);
 643 }
 644
 645 /*
 646  * Return the name of the network whose address is given.
 647  * The address is assumed to be that of a net, not a host.
 648  */
 649 static const char *
 650 netname(struct sockaddr *sa)
 651 {
 652         struct sockaddr_dl *sdl;
 653         int n;
 654 #ifdef INET
 655         struct netent *np = NULL;
 656         const char *cp = NULL;
 657         u_long i;
 658 #endif
 659
 660         switch (sa->sa_family) {
 661 #ifdef INET
 662         case AF_INET:
 663         {
 664                 struct in_addr in;
 665
 666                 in = ((struct sockaddr_in *)(void *)sa)->sin_addr;
 667                 i = in.s_addr = ntohl(in.s_addr);
 668                 if (in.s_addr == 0)
 669                         cp = "default";
 670                 else if (!nflag) {
 671                         np = getnetbyaddr(i, AF_INET);
 672                         if (np != NULL)
 673                                 cp = np->n_name;
 674                 }
 675 #define C(x)    (unsigned)((x) & 0xff)
 676                 if (cp != NULL)
 677                         strncpy(net_line, cp, sizeof(net_line));
 678                 else if ((in.s_addr & 0xffffff) == 0)
 679                         (void)sprintf(net_line, "%u", C(in.s_addr >> 24));
 680                 else if ((in.s_addr & 0xffff) == 0)
 681                         (void)sprintf(net_line, "%u.%u", C(in.s_addr >> 24),
 682                             C(in.s_addr >> 16));
 683                 else if ((in.s_addr & 0xff) == 0)
 684                         (void)sprintf(net_line, "%u.%u.%u", C(in.s_addr >> 24),
 685                             C(in.s_addr >> 16), C(in.s_addr >> 8));
 686                 else
 687                         (void)sprintf(net_line, "%u.%u.%u.%u", C(in.s_addr >> 24),
 688                             C(in.s_addr >> 16), C(in.s_addr >> 8),
 689                             C(in.s_addr));
 690 #undef C
 691                 break;
 692         }
 693 #endif
 694 #ifdef INET6
 695         case AF_INET6:
 696         {
 697                 struct sockaddr_in6 sin6;
 698                 int niflags = 0;
 699
 700                 memset(&sin6, 0, sizeof(sin6));
 701                 memcpy(&sin6, sa, sa->sa_len);
 702                 sin6.sin6_len = sizeof(sin6);
 703                 sin6.sin6_family = AF_INET6;
 704                 if (nflag)
 705                         niflags |= NI_NUMERICHOST;
 706                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 707                     net_line, sizeof(net_line), NULL, 0, niflags) != 0)
 708                         strncpy(net_line, "invalid", sizeof(net_line));
 709
 710                 return(net_line);
 711         }
 712 #endif
 713         case AF_LINK:
 714                 sdl = (struct sockaddr_dl *)(void *)sa;
 715
 716                 if (sdl->sdl_nlen == 0 &&
 717                     sdl->sdl_alen == 0 &&
 718                     sdl->sdl_slen == 0) {
 719                         n = snprintf(net_line, sizeof(net_line), "link#%d",
 720                             sdl->sdl_index);
 721                         if (n > (int)sizeof(net_line))
 722                             net_line[0] = '\0';
 723                         return (net_line);
 724                 } else
 725                         return (link_ntoa(sdl));
 726                 break;
 727
 728         default:
 729             {
 730                 u_short *sp = (u_short *)(void *)sa->sa_data;
 731                 u_short *splim = sp + ((sa->sa_len + 1)>>1);
 732                 char *cps = net_line + sprintf(net_line, "af %d:", sa->sa_family);
 733                 char *cpe = net_line + sizeof(net_line);
 734
 735                 while (sp < splim && cps < cpe)
 736                         if ((n = snprintf(cps, cpe - cps, " %x", *sp++)) > 0)
 737                                 cps += n;
 738                         else
 739                                 *cps = '\0';
 740                 break;
 741             }
 742         }
 743         return (net_line);
 744 }
 745
 746 static void
 747 set_metric(char *value, int key)
 748 {
 749         int flag = 0;
 750         char *endptr;
 751         u_long noval, *valp = &noval;
 752
 753         switch (key) {
 754 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
 755         caseof(K_MTU, RTV_MTU, rmx_mtu);
 756         caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
 757         caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
 758         caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
 759         caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
 760         caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
 761         caseof(K_RTT, RTV_RTT, rmx_rtt);
 762         caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
 763         caseof(K_WEIGHT, RTV_WEIGHT, rmx_weight);
 764         }
 765         rtm_inits |= flag;
 766         if (lockrest || locking)
 767                 rt_metrics.rmx_locks |= flag;
 768         if (locking)
 769                 locking = 0;
 770         errno = 0;
 771         *valp = strtol(value, &endptr, 0);
 772         if (errno == 0 && *endptr != '\0')
 773                 errno = EINVAL;
 774         if (errno)
 775                 err(EX_USAGE, "%s", value);
 776         if (flag & RTV_EXPIRE && (value[0] == '+' || value[0] == '-')) {
 777                 struct timespec ts;
 778
 779                 clock_gettime(CLOCK_REALTIME_FAST, &ts);
 780                 *valp += ts.tv_sec;
 781         }
 782 }
 783
 784 #define F_ISHOST        0x01
 785 #define F_FORCENET      0x02
 786 #define F_FORCEHOST     0x04
 787 #define F_PROXY         0x08
 788 #define F_INTERFACE     0x10
 789
 790 static void
 791 newroute(int argc, char **argv)
 792 {
 793         struct sigaction sa;
 794         struct hostent *hp;
 795         struct fibl *fl;
 796         char *cmd;
 797         const char *dest, *gateway, *errmsg;
 798         int key, error, flags, nrflags, fibnum;
 799
 800         if (uid != 0 && !debugonly && !tflag)
 801                 errx(EX_NOPERM, "must be root to alter routing table");
 802         dest = NULL;
 803         gateway = NULL;
 804         flags = RTF_STATIC;
 805         nrflags = 0;
 806         hp = NULL;
 807         TAILQ_INIT(&fibl_head);
 808
 809         sigemptyset(&sa.sa_mask);
 810         sa.sa_flags = 0;
 811         sa.sa_handler = stopit;
 812         if (sigaction(SIGALRM, &sa, 0) == -1)
 813                 warn("sigaction SIGALRM");
 814
 815         cmd = argv[0];
 816         if (*cmd != 'g' && *cmd != 's')
 817                 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 818         while (--argc > 0) {
 819                 if (**(++argv)== '-') {
 820                         switch (key = keyword(1 + *argv)) {
 821                         case K_LINK:
 822                                 af = AF_LINK;
 823                                 aflen = sizeof(struct sockaddr_dl);
 824                                 break;
 825 #ifdef INET
 826                         case K_4:
 827                         case K_INET:
 828                                 af = AF_INET;
 829                                 aflen = sizeof(struct sockaddr_in);
 830                                 break;
 831 #endif
 832 #ifdef INET6
 833                         case K_6:
 834                         case K_INET6:
 835                                 af = AF_INET6;
 836                                 aflen = sizeof(struct sockaddr_in6);
 837                                 break;
 838 #endif
 839                         case K_SA:
 840                                 af = PF_ROUTE;
 841                                 aflen = sizeof(struct sockaddr_storage);
 842                                 break;
 843                         case K_IFACE:
 844                         case K_INTERFACE:
 845                                 nrflags |= F_INTERFACE;
 846                                 break;
 847                         case K_NOSTATIC:
 848                                 flags &= ~RTF_STATIC;
 849                                 break;
 850                         case K_LOCK:
 851                                 locking = 1;
 852                                 break;
 853                         case K_LOCKREST:
 854                                 lockrest = 1;
 855                                 break;
 856                         case K_HOST:
 857                                 nrflags |= F_FORCEHOST;
 858                                 break;
 859                         case K_REJECT:
 860                                 flags |= RTF_REJECT;
 861                                 break;
 862                         case K_BLACKHOLE:
 863                                 flags |= RTF_BLACKHOLE;
 864                                 break;
 865                         case K_PROTO1:
 866                                 flags |= RTF_PROTO1;
 867                                 break;
 868                         case K_PROTO2:
 869                                 flags |= RTF_PROTO2;
 870                                 break;
 871                         case K_PROXY:
 872                                 nrflags |= F_PROXY;
 873                                 break;
 874                         case K_XRESOLVE:
 875                                 flags |= RTF_XRESOLVE;
 876                                 break;
 877                         case K_STATIC:
 878                                 flags |= RTF_STATIC;
 879                                 break;
 880                         case K_STICKY:
 881                                 flags |= RTF_STICKY;
 882                                 break;
 883                         case K_NOSTICK:
 884                                 flags &= ~RTF_STICKY;
 885                                 break;
 886                         case K_FIB:
 887                                 if (!--argc)
 888                                         usage(NULL);
 889                                 error = fiboptlist_csv(*++argv, &fibl_head);
 890                                 if (error)
 891                                         errx(EX_USAGE,
 892                                             "invalid fib number: %s", *argv);
 893                                 break;
 894                         case K_IFA:
 895                                 if (!--argc)
 896                                         usage(NULL);
 897                                 getaddr(RTAX_IFA, *++argv, 0, nrflags);
 898                                 break;
 899                         case K_IFP:
 900                                 if (!--argc)
 901                                         usage(NULL);
 902                                 getaddr(RTAX_IFP, *++argv, 0, nrflags);
 903                                 break;
 904                         case K_GENMASK:
 905                                 if (!--argc)
 906                                         usage(NULL);
 907                                 getaddr(RTAX_GENMASK, *++argv, 0, nrflags);
 908                                 break;
 909                         case K_GATEWAY:
 910                                 if (!--argc)
 911                                         usage(NULL);
 912                                 getaddr(RTAX_GATEWAY, *++argv, 0, nrflags);
 913                                 gateway = *argv;
 914                                 break;
 915                         case K_DST:
 916                                 if (!--argc)
 917                                         usage(NULL);
 918                                 if (getaddr(RTAX_DST, *++argv, &hp, nrflags))
 919                                         nrflags |= F_ISHOST;
 920                                 dest = *argv;
 921                                 break;
 922                         case K_NETMASK:
 923                                 if (!--argc)
 924                                         usage(NULL);
 925                                 getaddr(RTAX_NETMASK, *++argv, 0, nrflags);
 926                                 /* FALLTHROUGH */
 927                         case K_NET:
 928                                 nrflags |= F_FORCENET;
 929                                 break;
 930                         case K_PREFIXLEN:
 931                                 if (!--argc)
 932                                         usage(NULL);
 933                                 if (prefixlen(*++argv) == -1) {
 934                                         nrflags &= ~F_FORCENET;
 935                                         nrflags |= F_ISHOST;
 936                                 } else {
 937                                         nrflags |= F_FORCENET;
 938                                         nrflags &= ~F_ISHOST;
 939                                 }
 940                                 break;
 941                         case K_MTU:
 942                         case K_HOPCOUNT:
 943                         case K_EXPIRE:
 944                         case K_RECVPIPE:
 945                         case K_SENDPIPE:
 946                         case K_SSTHRESH:
 947                         case K_RTT:
 948                         case K_RTTVAR:
 949                         case K_WEIGHT:
 950                                 if (!--argc)
 951                                         usage(NULL);
 952                                 set_metric(*++argv, key);
 953                                 break;
 954                         default:
 955                                 usage(1+*argv);
 956                         }
 957                 } else {
 958                         if ((rtm_addrs & RTA_DST) == 0) {
 959                                 dest = *argv;
 960                                 if (getaddr(RTAX_DST, *argv, &hp, nrflags))
 961                                         nrflags |= F_ISHOST;
 962                         } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
 963                                 gateway = *argv;
 964                                 getaddr(RTAX_GATEWAY, *argv, &hp, nrflags);
 965                         } else {
 966                                 getaddr(RTAX_NETMASK, *argv, 0, nrflags);
 967                                 nrflags |= F_FORCENET;
 968                         }
 969                 }
 970         }
 971
 972         /* Do some sanity checks on resulting request */
 973         if (so[RTAX_DST].ss_len == 0) {
 974                 warnx("destination parameter required");
 975                 usage(NULL);
 976         }
 977
 978         if (so[RTAX_NETMASK].ss_len != 0 &&
 979             so[RTAX_DST].ss_family != so[RTAX_NETMASK].ss_family) {
 980                 warnx("destination and netmask family need to be the same");
 981                 usage(NULL);
 982         }
 983
 984         if (nrflags & F_FORCEHOST) {
 985                 nrflags |= F_ISHOST;
 986 #ifdef INET6
 987                 if (af == AF_INET6) {
 988                         rtm_addrs &= ~RTA_NETMASK;
 989                         memset(&so[RTAX_NETMASK], 0, sizeof(so[RTAX_NETMASK]));
 990                 }
 991 #endif
 992         }
 993         if (nrflags & F_FORCENET)
 994                 nrflags &= ~F_ISHOST;
 995         flags |= RTF_UP;
 996         if (nrflags & F_ISHOST)
 997                 flags |= RTF_HOST;
 998         if ((nrflags & F_INTERFACE) == 0)
 999                 flags |= RTF_GATEWAY;
1000         if (nrflags & F_PROXY)
1001                 flags |= RTF_ANNOUNCE;
1002         if (dest == NULL)
1003                 dest = "";
1004         if (gateway == NULL)
1005                 gateway = "";
1006
1007         if (TAILQ_EMPTY(&fibl_head)) {
1008                 error = fiboptlist_csv("default", &fibl_head);
1009                 if (error)
1010                         errx(EX_OSERR, "fiboptlist_csv failed.");
1011         }
1012         error = 0;
1013         TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1014                 fl->fl_error = newroute_fib(fl->fl_num, cmd, flags);
1015                 if (fl->fl_error)
1016                         fl->fl_errno = errno;
1017                 error += fl->fl_error;
1018         }
1019         if (*cmd == 'g' || *cmd == 's')
1020                 exit(error);
1021
1022         error = 0;
1023         if (!qflag) {
1024                 fibnum = 0;
1025                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1026                         if (fl->fl_error == 0)
1027                                 fibnum++;
1028                 }
1029                 if (fibnum > 0) {
1030                         int firstfib = 1;
1031
1032                         printf("%s %s %s", cmd,
1033                             (nrflags & F_ISHOST) ? "host" : "net", dest);
1034                         if (*gateway)
1035                                 printf(": gateway %s", gateway);
1036
1037                         if (numfibs > 1) {
1038                                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1039                                         if (fl->fl_error == 0
1040                                             && fl->fl_num >= 0) {
1041                                                 if (firstfib) {
1042                                                         printf(" fib ");
1043                                                         firstfib = 0;
1044                                                 }
1045                                                 printf("%d", fl->fl_num);
1046                                                 if (fibnum-- > 1)
1047                                                         printf(",");
1048                                         }
1049                                 }
1050                         }
1051                         printf("\n");
1052                 }
1053
1054                 fibnum = 0;
1055                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1056                         if (fl->fl_error != 0) {
1057                                 printf("%s %s %s", cmd, (nrflags & F_ISHOST)
1058                                     ? "host" : "net", dest);
1059                                 if (*gateway)
1060                                         printf(": gateway %s", gateway);
1061
1062                                 if (fl->fl_num >= 0)
1063                                         printf(" fib %d", fl->fl_num);
1064
1065                                 switch (fl->fl_errno) {
1066                                 case ESRCH:
1067                                         errmsg = "not in table";
1068                                         break;
1069                                 case EBUSY:
1070                                         errmsg = "entry in use";
1071                                         break;
1072                                 case ENOBUFS:
1073                                         errmsg = "not enough memory";
1074                                         break;
1075                                 case EADDRINUSE:
1076                                         /*
1077                                          * handle recursion avoidance
1078                                          * in rt_setgate()
1079                                          */
1080                                         errmsg = "gateway uses the same route";
1081                                         break;
1082                                 case EEXIST:
1083                                         errmsg = "route already in table";
1084                                         break;
1085                                 default:
1086                                         errmsg = strerror(fl->fl_errno);
1087                                         break;
1088                                 }
1089                                 printf(": %s\n", errmsg);
1090                                 error = 1;
1091                         }
1092                 }
1093         }
1094         exit(error);
1095 }
1096
1097 static int
1098 newroute_fib(int fib, char *cmd, int flags)
1099 {
1100         int error;
1101
1102         error = set_sofib(fib);
1103         if (error) {
1104                 warn("fib number %d is ignored", fib);
1105                 return (error);
1106         }
1107
1108         error = rtmsg(*cmd, flags, fib);
1109         return (error);
1110 }
1111
1112 #ifdef INET
1113 static void
1114 inet_makenetandmask(u_long net, struct sockaddr_in *sin,
1115     struct sockaddr_in *sin_mask, u_long bits)
1116 {
1117         u_long mask = 0;
1118
1119         rtm_addrs |= RTA_NETMASK;
1120
1121         /*
1122          * MSB of net should be meaningful. 0/0 is exception.
1123          */
1124         if (net > 0)
1125                 while ((net & 0xff000000) == 0)
1126                         net <<= 8;
1127
1128         /*
1129          * If no /xx was specified we must calculate the
1130          * CIDR address.
1131          */
1132         if ((bits == 0) && (net != 0)) {
1133                 u_long i, j;
1134
1135                 for(i = 0, j = 0xff; i < 4; i++)  {
1136                         if (net & j) {
1137                                 break;
1138                         }
1139                         j <<= 8;
1140                 }
1141                 /* i holds the first non zero bit */
1142                 bits = 32 - (i*8);
1143         }
1144         if (bits != 0)
1145                 mask = 0xffffffff << (32 - bits);
1146
1147         sin->sin_addr.s_addr = htonl(net);
1148         sin_mask->sin_addr.s_addr = htonl(mask);
1149         sin_mask->sin_len = sizeof(struct sockaddr_in);
1150         sin_mask->sin_family = AF_INET;
1151 }
1152 #endif
1153
1154 #ifdef INET6
1155 /*
1156  * XXX the function may need more improvement...
1157  */
1158 static int
1159 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
1160 {
1161
1162         if (plen == NULL) {
1163                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
1164                     sin6->sin6_scope_id == 0)
1165                         plen = "0";
1166         }
1167
1168         if (plen == NULL || strcmp(plen, "128") == 0)
1169                 return (1);
1170         rtm_addrs |= RTA_NETMASK;
1171         prefixlen(plen);
1172         return (0);
1173 }
1174 #endif
1175
1176 /*
1177  * Interpret an argument as a network address of some kind,
1178  * returning 1 if a host address, 0 if a network address.
1179  */
1180 static int
1181 getaddr(int idx, char *str, struct hostent **hpp, int nrflags)
1182 {
1183         struct sockaddr *sa;
1184 #if defined(INET)
1185         struct sockaddr_in *sin;
1186         struct hostent *hp;
1187         struct netent *np;
1188         u_long val;
1189         char *q;
1190 #elif defined(INET6)
1191         char *q;
1192 #endif
1193
1194         if (idx < 0 || idx >= RTAX_MAX)
1195                 usage("internal error");
1196         if (af == 0) {
1197 #if defined(INET)
1198                 af = AF_INET;
1199                 aflen = sizeof(struct sockaddr_in);
1200 #elif defined(INET6)
1201                 af = AF_INET6;
1202                 aflen = sizeof(struct sockaddr_in6);
1203 #else
1204                 af = AF_LINK;
1205                 aflen = sizeof(struct sockaddr_dl);
1206 #endif
1207         }
1208 #ifndef INET
1209         hpp = NULL;
1210 #endif
1211         rtm_addrs |= (1 << idx);
1212         sa = (struct sockaddr *)&so[idx];
1213         sa->sa_family = af;
1214         sa->sa_len = aflen;
1215
1216         switch (idx) {
1217         case RTAX_GATEWAY:
1218                 if (nrflags & F_INTERFACE) {
1219                         struct ifaddrs *ifap, *ifa;
1220                         struct sockaddr_dl *sdl0 = (struct sockaddr_dl *)(void *)sa;
1221                         struct sockaddr_dl *sdl = NULL;
1222
1223                         if (getifaddrs(&ifap))
1224                                 err(EX_OSERR, "getifaddrs");
1225
1226                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
1227                                 if (ifa->ifa_addr->sa_family != AF_LINK)
1228                                         continue;
1229
1230                                 if (strcmp(str, ifa->ifa_name) != 0)
1231                                         continue;
1232
1233                                 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
1234                         }
1235                         /* If we found it, then use it */
1236                         if (sdl != NULL) {
1237                                 /*
1238                                  * Note that we need to copy before calling
1239                                  * freeifaddrs().
1240                                  */
1241                                 memcpy(sdl0, sdl, sdl->sdl_len);
1242                         }
1243                         freeifaddrs(ifap);
1244                         if (sdl != NULL)
1245                                 return(1);
1246                         else
1247                                 errx(EX_DATAERR,
1248                                     "interface '%s' does not exist", str);
1249                 }
1250                 break;
1251         case RTAX_IFP:
1252                 sa->sa_family = AF_LINK;
1253                 break;
1254         }
1255         if (strcmp(str, "default") == 0) {
1256                 /*
1257                  * Default is net 0.0.0.0/0
1258                  */
1259                 switch (idx) {
1260                 case RTAX_DST:
1261                         nrflags |= F_FORCENET;
1262                         getaddr(RTAX_NETMASK, str, 0, nrflags);
1263                         break;
1264                 }
1265                 return (0);
1266         }
1267         switch (sa->sa_family) {
1268 #ifdef INET6
1269         case AF_INET6:
1270         {
1271                 struct addrinfo hints, *res;
1272                 int ecode;
1273
1274                 q = NULL;
1275                 if (idx == RTAX_DST && (q = strchr(str, '/')) != NULL)
1276                         *q = '\0';
1277                 memset(&hints, 0, sizeof(hints));
1278                 hints.ai_family = sa->sa_family;
1279                 hints.ai_socktype = SOCK_DGRAM;
1280                 ecode = getaddrinfo(str, NULL, &hints, &res);
1281                 if (ecode != 0 || res->ai_family != AF_INET6 ||
1282                     res->ai_addrlen != sizeof(struct sockaddr_in6))
1283                         errx(EX_OSERR, "%s: %s", str, gai_strerror(ecode));
1284                 memcpy(sa, res->ai_addr, res->ai_addrlen);
1285                 freeaddrinfo(res);
1286                 if (q != NULL)
1287                         *q++ = '/';
1288                 if (idx == RTAX_DST)
1289                         return (inet6_makenetandmask((struct sockaddr_in6 *)(void *)sa, q));
1290                 return (0);
1291         }
1292 #endif /* INET6 */
1293         case AF_LINK:
1294                 link_addr(str, (struct sockaddr_dl *)(void *)sa);
1295                 return (1);
1296
1297         case PF_ROUTE:
1298                 sockaddr(str, sa, sizeof(struct sockaddr_storage));
1299                 return (1);
1300 #ifdef INET
1301         case AF_INET:
1302 #endif
1303         default:
1304                 break;
1305         }
1306
1307 #ifdef INET
1308         sin = (struct sockaddr_in *)(void *)sa;
1309         if (hpp == NULL)
1310                 hpp = &hp;
1311         *hpp = NULL;
1312
1313         q = strchr(str,'/');
1314         if (q != NULL && idx == RTAX_DST) {
1315                 *q = '\0';
1316                 if ((val = inet_network(str)) != INADDR_NONE) {
1317                         inet_makenetandmask(val, sin,
1318                             (struct sockaddr_in *)&so[RTAX_NETMASK],
1319                             strtoul(q+1, 0, 0));
1320                         return (0);
1321                 }
1322                 *q = '/';
1323         }
1324         if ((idx != RTAX_DST || (nrflags & F_FORCENET) == 0) &&
1325             inet_aton(str, &sin->sin_addr)) {
1326                 val = sin->sin_addr.s_addr;
1327                 if (idx != RTAX_DST || nrflags & F_FORCEHOST ||
1328                     inet_lnaof(sin->sin_addr) != INADDR_ANY)
1329                         return (1);
1330                 else {
1331                         val = ntohl(val);
1332                         goto netdone;
1333                 }
1334         }
1335         if (idx == RTAX_DST && (nrflags & F_FORCEHOST) == 0 &&
1336             ((val = inet_network(str)) != INADDR_NONE ||
1337             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1338 netdone:
1339                 inet_makenetandmask(val, sin,
1340                     (struct sockaddr_in *)&so[RTAX_NETMASK], 0);
1341                 return (0);
1342         }
1343         hp = gethostbyname(str);
1344         if (hp != NULL) {
1345                 *hpp = hp;
1346                 sin->sin_family = hp->h_addrtype;
1347                 memmove((char *)&sin->sin_addr, hp->h_addr,
1348                     MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
1349                 return (1);
1350         }
1351 #endif
1352         errx(EX_NOHOST, "bad address: %s", str);
1353 }
1354
1355 static int
1356 prefixlen(const char *str)
1357 {
1358         int len = atoi(str), q, r;
1359         int max;
1360         char *p;
1361
1362         rtm_addrs |= RTA_NETMASK;
1363         switch (af) {
1364 #ifdef INET6
1365         case AF_INET6:
1366         {
1367                 struct sockaddr_in6 *sin6 =
1368                     (struct sockaddr_in6 *)&so[RTAX_NETMASK];
1369
1370                 max = 128;
1371                 p = (char *)&sin6->sin6_addr;
1372                 sin6->sin6_family = AF_INET6;
1373                 sin6->sin6_len = sizeof(*sin6);
1374                 break;
1375         }
1376 #endif
1377 #ifdef INET
1378         case AF_INET:
1379         {
1380                 struct sockaddr_in *sin =
1381                     (struct sockaddr_in *)&so[RTAX_NETMASK];
1382
1383                 max = 32;
1384                 p = (char *)&sin->sin_addr;
1385                 sin->sin_family = AF_INET;
1386                 sin->sin_len = sizeof(*sin);
1387                 break;
1388         }
1389 #endif
1390         default:
1391                 errx(EX_OSERR, "prefixlen not supported in this af");
1392         }
1393
1394         if (len < 0 || max < len)
1395                 errx(EX_USAGE, "%s: invalid prefixlen", str);
1396
1397         q = len >> 3;
1398         r = len & 7;
1399         memset((void *)p, 0, max / 8);
1400         if (q > 0)
1401                 memset((void *)p, 0xff, q);
1402         if (r > 0)
1403                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1404         if (len == max)
1405                 return (-1);
1406         else
1407                 return (len);
1408 }
1409
1410 static void
1411 interfaces(void)
1412 {
1413         size_t needed;
1414         int mib[6];
1415         char *buf, *lim, *next, count = 0;
1416         struct rt_msghdr *rtm;
1417
1418 retry2:
1419         mib[0] = CTL_NET;
1420         mib[1] = PF_ROUTE;
1421         mib[2] = 0;             /* protocol */
1422         mib[3] = AF_UNSPEC;
1423         mib[4] = NET_RT_IFLIST;
1424         mib[5] = 0;             /* no flags */
1425         if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
1426                 err(EX_OSERR, "route-sysctl-estimate");
1427         if ((buf = malloc(needed)) == NULL)
1428                 errx(EX_OSERR, "malloc failed");
1429         if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
1430                 if (errno == ENOMEM && count++ < 10) {
1431                         warnx("Routing table grew, retrying");
1432                         sleep(1);
1433                         free(buf);
1434                         goto retry2;
1435                 }
1436                 err(EX_OSERR, "actual retrieval of interface table");
1437         }
1438         lim = buf + needed;
1439         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1440                 rtm = (struct rt_msghdr *)(void *)next;
1441                 print_rtmsg(rtm, rtm->rtm_msglen);
1442         }
1443         free(buf);
1444 }
1445
1446 static void
1447 monitor(int argc, char *argv[])
1448 {
1449         int n, fib, error;
1450         char msg[2048], *endptr;
1451
1452         fib = defaultfib;
1453         while (argc > 1) {
1454                 argc--;
1455                 argv++;
1456                 if (**argv != '-')
1457                         usage(*argv);
1458                 switch (keyword(*argv + 1)) {
1459                 case K_FIB:
1460                         if (!--argc)
1461                                 usage(*argv);
1462                         errno = 0;
1463                         fib = strtol(*++argv, &endptr, 0);
1464                         if (errno == 0) {
1465                                 if (*endptr != '\0' ||
1466                                     fib < 0 ||
1467                                     (numfibs != -1 && fib > numfibs - 1))
1468                                         errno = EINVAL;
1469                         }
1470                         if (errno)
1471                                 errx(EX_USAGE, "invalid fib number: %s", *argv);
1472                         break;
1473                 default:
1474                         usage(*argv);
1475                 }
1476         }
1477         error = set_sofib(fib);
1478         if (error)
1479                 errx(EX_USAGE, "invalid fib number: %d", fib);
1480
1481         verbose = 1;
1482         if (debugonly) {
1483                 interfaces();
1484                 exit(0);
1485         }
1486         for (;;) {
1487                 time_t now;
1488                 n = read(s, msg, 2048);
1489                 now = time(NULL);
1490                 (void)printf("\ngot message of size %d on %s", n, ctime(&now));
1491                 print_rtmsg((struct rt_msghdr *)(void *)msg, n);
1492         }
1493 }
1494
1495 static int
1496 rtmsg(int cmd, int flags, int fib)
1497 {
1498         int rlen;
1499         char *cp = m_rtmsg.m_space;
1500         int l;
1501
1502 #define NEXTADDR(w, u)                                                  \
1503         if (rtm_addrs & (w)) {                                          \
1504                 l = SA_SIZE(&(u));                                      \
1505                 memmove(cp, (char *)&(u), l);                           \
1506                 cp += l;                                                \
1507                 if (verbose)                                            \
1508                         sodump((struct sockaddr *)&(u), #w);            \
1509         }
1510
1511         errno = 0;
1512         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1513         if (cmd == 'a')
1514                 cmd = RTM_ADD;
1515         else if (cmd == 'c')
1516                 cmd = RTM_CHANGE;
1517         else if (cmd == 'g' || cmd == 's') {
1518                 cmd = RTM_GET;
1519                 if (so[RTAX_IFP].ss_family == 0) {
1520                         so[RTAX_IFP].ss_family = AF_LINK;
1521                         so[RTAX_IFP].ss_len = sizeof(struct sockaddr_dl);
1522                         rtm_addrs |= RTA_IFP;
1523                 }
1524         } else {
1525                 cmd = RTM_DELETE;
1526                 flags |= RTF_PINNED;
1527         }
1528 #define rtm m_rtmsg.m_rtm
1529         rtm.rtm_type = cmd;
1530         rtm.rtm_flags = flags;
1531         rtm.rtm_version = RTM_VERSION;
1532         rtm.rtm_seq = ++rtm_seq;
1533         rtm.rtm_addrs = rtm_addrs;
1534         rtm.rtm_rmx = rt_metrics;
1535         rtm.rtm_inits = rtm_inits;
1536
1537         NEXTADDR(RTA_DST, so[RTAX_DST]);
1538         NEXTADDR(RTA_GATEWAY, so[RTAX_GATEWAY]);
1539         NEXTADDR(RTA_NETMASK, so[RTAX_NETMASK]);
1540         NEXTADDR(RTA_GENMASK, so[RTAX_GENMASK]);
1541         NEXTADDR(RTA_IFP, so[RTAX_IFP]);
1542         NEXTADDR(RTA_IFA, so[RTAX_IFA]);
1543         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1544         if (verbose)
1545                 print_rtmsg(&rtm, l);
1546         if (debugonly)
1547                 return (0);
1548         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1549                 switch (errno) {
1550                 case EPERM:
1551                         err(1, "writing to routing socket");
1552                         break;
1553                 case ESRCH:
1554                         warnx("route has not been found");
1555                         break;
1556                 case EEXIST:
1557                         /* Handled by newroute() */
1558                         break;
1559                 default:
1560                         warn("writing to routing socket");
1561                 }
1562                 return (-1);
1563         }
1564         if (cmd == RTM_GET) {
1565                 stop_read = 0;
1566                 alarm(READ_TIMEOUT);
1567                 do {
1568                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1569                 } while (l > 0 && stop_read == 0 &&
1570                     (rtm.rtm_type != RTM_GET || rtm.rtm_seq != rtm_seq ||
1571                         rtm.rtm_pid != pid));
1572                 if (stop_read != 0) {
1573                         warnx("read from routing socket timed out");
1574                         return (-1);
1575                 } else
1576                         alarm(0);
1577                 if (l < 0)
1578                         warn("read from routing socket");
1579                 else
1580                         print_getmsg(&rtm, l, fib);
1581         }
1582 #undef rtm
1583         return (0);
1584 }
1585
1586 static const char *const msgtypes[] = {
1587         "",
1588         "RTM_ADD: Add Route",
1589         "RTM_DELETE: Delete Route",
1590         "RTM_CHANGE: Change Metrics or flags",
1591         "RTM_GET: Report Metrics",
1592         "RTM_LOSING: Kernel Suspects Partitioning",
1593         "RTM_REDIRECT: Told to use different route",
1594         "RTM_MISS: Lookup failed on this address",
1595         "RTM_LOCK: fix specified metrics",
1596         "RTM_OLDADD: caused by SIOCADDRT",
1597         "RTM_OLDDEL: caused by SIOCDELRT",
1598         "RTM_RESOLVE: Route created by cloning",
1599         "RTM_NEWADDR: address being added to iface",
1600         "RTM_DELADDR: address being removed from iface",
1601         "RTM_IFINFO: iface status change",
1602         "RTM_NEWMADDR: new multicast group membership on iface",
1603         "RTM_DELMADDR: multicast group membership removed from iface",
1604         "RTM_IFANNOUNCE: interface arrival/departure",
1605         "RTM_IEEE80211: IEEE 802.11 wireless event",
1606 };
1607
1608 static const char metricnames[] =
1609     "\011weight\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire"
1610     "\1mtu";
1611 static const char routeflags[] =
1612     "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE"
1613     "\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE"
1614     "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3"
1615     "\024FIXEDMTU\025PINNED\026LOCAL\027BROADCAST\030MULTICAST\035STICKY";
1616 static const char ifnetflags[] =
1617     "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1618     "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1619     "\017LINK2\020MULTICAST";
1620 static const char addrnames[] =
1621     "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD";
1622
1623 static const char errfmt[] =
1624     "\n%s: truncated route message, only %zu bytes left\n";
1625
1626 static void
1627 print_rtmsg(struct rt_msghdr *rtm, size_t msglen)
1628 {
1629         struct if_msghdr *ifm;
1630         struct ifa_msghdr *ifam;
1631 #ifdef RTM_NEWMADDR
1632         struct ifma_msghdr *ifmam;
1633 #endif
1634         struct if_announcemsghdr *ifan;
1635         const char *state;
1636
1637         if (verbose == 0)
1638                 return;
1639         if (rtm->rtm_version != RTM_VERSION) {
1640                 (void)printf("routing message version %d not understood\n",
1641                     rtm->rtm_version);
1642                 return;
1643         }
1644         if (rtm->rtm_type < nitems(msgtypes))
1645                 (void)printf("%s: ", msgtypes[rtm->rtm_type]);
1646         else
1647                 (void)printf("unknown type %d: ", rtm->rtm_type);
1648         (void)printf("len %d, ", rtm->rtm_msglen);
1649
1650 #define REQUIRE(x)      do {            \
1651         if (msglen < sizeof(x))         \
1652                 goto badlen;            \
1653         else                            \
1654                 msglen -= sizeof(x);    \
1655         } while (0)
1656
1657         switch (rtm->rtm_type) {
1658         case RTM_IFINFO:
1659                 REQUIRE(struct if_msghdr);
1660                 ifm = (struct if_msghdr *)rtm;
1661                 (void)printf("if# %d, ", ifm->ifm_index);
1662                 switch (ifm->ifm_data.ifi_link_state) {
1663                 case LINK_STATE_DOWN:
1664                         state = "down";
1665                         break;
1666                 case LINK_STATE_UP:
1667                         state = "up";
1668                         break;
1669                 default:
1670                         state = "unknown";
1671                         break;
1672                 }
1673                 (void)printf("link: %s, flags:", state);
1674                 printb(ifm->ifm_flags, ifnetflags);
1675                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs, msglen);
1676                 break;
1677         case RTM_NEWADDR:
1678         case RTM_DELADDR:
1679                 REQUIRE(struct ifa_msghdr);
1680                 ifam = (struct ifa_msghdr *)rtm;
1681                 (void)printf("metric %d, flags:", ifam->ifam_metric);
1682                 printb(ifam->ifam_flags, routeflags);
1683                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs, msglen);
1684                 break;
1685 #ifdef RTM_NEWMADDR
1686         case RTM_NEWMADDR:
1687         case RTM_DELMADDR:
1688                 REQUIRE(struct ifma_msghdr);
1689                 ifmam = (struct ifma_msghdr *)rtm;
1690                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs, msglen);
1691                 break;
1692 #endif
1693         case RTM_IFANNOUNCE:
1694                 REQUIRE(struct if_announcemsghdr);
1695                 ifan = (struct if_announcemsghdr *)rtm;
1696                 (void)printf("if# %d, what: ", ifan->ifan_index);
1697                 switch (ifan->ifan_what) {
1698                 case IFAN_ARRIVAL:
1699                         (void)printf("arrival");
1700                         break;
1701                 case IFAN_DEPARTURE:
1702                         printf("departure");
1703                         break;
1704                 default:
1705                         printf("#%d", ifan->ifan_what);
1706                         break;
1707                 }
1708                 printf("\n");
1709                 fflush(stdout);
1710                 break;
1711
1712         default:
1713                 if (rtm->rtm_type <= RTM_RESOLVE) {
1714                         printf("pid: %ld, seq %d, errno %d, flags:",
1715                             (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1716                         printb(rtm->rtm_flags, routeflags);
1717                         pmsg_common(rtm, msglen);
1718                 } else
1719                         printf("type: %u, len: %zu\n", rtm->rtm_type, msglen);
1720         }
1721
1722         return;
1723
1724 badlen:
1725         (void)printf(errfmt, __func__, msglen);
1726 #undef  REQUIRE
1727 }
1728
1729 static void
1730 print_getmsg(struct rt_msghdr *rtm, int msglen, int fib)
1731 {
1732         struct sockaddr *sp[RTAX_MAX];
1733         struct timespec ts;
1734         char *cp;
1735         int i;
1736
1737         memset(sp, 0, sizeof(sp));
1738         (void)printf("   route to: %s\n",
1739             routename((struct sockaddr *)&so[RTAX_DST]));
1740         if (rtm->rtm_version != RTM_VERSION) {
1741                 warnx("routing message version %d not understood",
1742                      rtm->rtm_version);
1743                 return;
1744         }
1745         if (rtm->rtm_msglen > msglen) {
1746                 warnx("message length mismatch, in packet %d, returned %d",
1747                       rtm->rtm_msglen, msglen);
1748                 return;
1749         }
1750         if (rtm->rtm_errno)  {
1751                 errno = rtm->rtm_errno;
1752                 warn("message indicates error %d", errno);
1753                 return;
1754         }
1755         cp = ((char *)(rtm + 1));
1756         for (i = 0; i < RTAX_MAX; i++)
1757                 if (rtm->rtm_addrs & (1 << i)) {
1758                         sp[i] = (struct sockaddr *)cp;
1759                         cp += SA_SIZE((struct sockaddr *)cp);
1760                 }
1761         if ((rtm->rtm_addrs & RTA_IFP) &&
1762             (sp[RTAX_IFP]->sa_family != AF_LINK ||
1763              ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen == 0))
1764                         sp[RTAX_IFP] = NULL;
1765         if (sp[RTAX_DST])
1766                 (void)printf("destination: %s\n", routename(sp[RTAX_DST]));
1767         if (sp[RTAX_NETMASK])
1768                 (void)printf("       mask: %s\n", routename(sp[RTAX_NETMASK]));
1769         if (sp[RTAX_GATEWAY] && (rtm->rtm_flags & RTF_GATEWAY))
1770                 (void)printf("    gateway: %s\n", routename(sp[RTAX_GATEWAY]));
1771         if (fib >= 0)
1772                 (void)printf("        fib: %u\n", (unsigned int)fib);
1773         if (sp[RTAX_IFP])
1774                 (void)printf("  interface: %.*s\n",
1775                     ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen,
1776                     ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_data);
1777         (void)printf("      flags: ");
1778         printb(rtm->rtm_flags, routeflags);
1779
1780 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1781 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1782         printf("\n%9s %9s %9s %9s %9s %10s %9s\n", "recvpipe",
1783             "sendpipe", "ssthresh", "rtt,msec", "mtu   ", "weight", "expire");
1784         printf("%8lu%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1785         printf("%8lu%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1786         printf("%8lu%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1787         printf("%8lu%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1788         printf("%8lu%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1789         printf("%8lu%c ", rtm->rtm_rmx.rmx_weight, lock(WEIGHT));
1790         if (rtm->rtm_rmx.rmx_expire > 0)
1791                 clock_gettime(CLOCK_REALTIME_FAST, &ts);
1792         else
1793                 ts.tv_sec = 0;
1794         printf("%8ld%c\n", (long)(rtm->rtm_rmx.rmx_expire - ts.tv_sec),
1795             lock(EXPIRE));
1796 #undef lock
1797 #undef msec
1798 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1799         if (verbose)
1800                 pmsg_common(rtm, msglen);
1801         else if (rtm->rtm_addrs &~ RTA_IGN) {
1802                 (void)printf("sockaddrs: ");
1803                 printb(rtm->rtm_addrs, addrnames);
1804                 putchar('\n');
1805         }
1806 #undef  RTA_IGN
1807 }
1808
1809 static void
1810 pmsg_common(struct rt_msghdr *rtm, size_t msglen)
1811 {
1812
1813         (void)printf("\nlocks: ");
1814         printb(rtm->rtm_rmx.rmx_locks, metricnames);
1815         (void)printf(" inits: ");
1816         printb(rtm->rtm_inits, metricnames);
1817         if (msglen > sizeof(struct rt_msghdr))
1818                 pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs,
1819                     msglen - sizeof(struct rt_msghdr));
1820         else
1821                 (void)fflush(stdout);
1822 }
1823
1824 static void
1825 pmsg_addrs(char *cp, int addrs, size_t len)
1826 {
1827         struct sockaddr *sa;
1828         int i;
1829
1830         if (addrs == 0) {
1831                 (void)putchar('\n');
1832                 return;
1833         }
1834         (void)printf("\nsockaddrs: ");
1835         printb(addrs, addrnames);
1836         putchar('\n');
1837         for (i = 0; i < RTAX_MAX; i++)
1838                 if (addrs & (1 << i)) {
1839                         sa = (struct sockaddr *)cp;
1840                         if (len == 0 || len < SA_SIZE(sa)) {
1841                                 (void)printf(errfmt, __func__, len);
1842                                 break;
1843                         }
1844                         (void)printf(" %s", routename(sa));
1845                         len -= SA_SIZE(sa);
1846                         cp += SA_SIZE(sa);
1847                 }
1848         (void)putchar('\n');
1849         (void)fflush(stdout);
1850 }
1851
1852 static void
1853 printb(int b, const char *str)
1854 {
1855         int i;
1856         int gotsome = 0;
1857
1858         if (b == 0)
1859                 return;
1860         while ((i = *str++) != 0) {
1861                 if (b & (1 << (i-1))) {
1862                         if (gotsome == 0)
1863                                 i = '<';
1864                         else
1865                                 i = ',';
1866                         putchar(i);
1867                         gotsome = 1;
1868                         for (; (i = *str) > 32; str++)
1869                                 putchar(i);
1870                 } else
1871                         while (*str > 32)
1872                                 str++;
1873         }
1874         if (gotsome)
1875                 putchar('>');
1876 }
1877
1878 int
1879 keyword(const char *cp)
1880 {
1881         const struct keytab *kt = keywords;
1882
1883         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1884                 kt++;
1885         return (kt->kt_i);
1886 }
1887
1888 static void
1889 sodump(struct sockaddr *sa, const char *which)
1890 {
1891 #ifdef INET6
1892         char nbuf[INET6_ADDRSTRLEN];
1893 #endif
1894
1895         switch (sa->sa_family) {
1896         case AF_LINK:
1897                 (void)printf("%s: link %s; ", which,
1898                     link_ntoa((struct sockaddr_dl *)(void *)sa));
1899                 break;
1900 #ifdef INET
1901         case AF_INET:
1902                 (void)printf("%s: inet %s; ", which,
1903                     inet_ntoa(((struct sockaddr_in *)(void *)sa)->sin_addr));
1904                 break;
1905 #endif
1906 #ifdef INET6
1907         case AF_INET6:
1908                 (void)printf("%s: inet6 %s; ", which, inet_ntop(sa->sa_family,
1909                     &((struct sockaddr_in6 *)(void *)sa)->sin6_addr, nbuf,
1910                     sizeof(nbuf)));
1911                 break;
1912 #endif
1913         }
1914         (void)fflush(stdout);
1915 }
1916
1917 /* States*/
1918 #define VIRGIN  0
1919 #define GOTONE  1
1920 #define GOTTWO  2
1921 /* Inputs */
1922 #define DIGIT   (4*0)
1923 #define END     (4*1)
1924 #define DELIM   (4*2)
1925
1926 static void
1927 sockaddr(char *addr, struct sockaddr *sa, size_t size)
1928 {
1929         char *cp = (char *)sa;
1930         char *cplim = cp + size;
1931         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1932
1933         memset(cp, 0, size);
1934         cp++;
1935         do {
1936                 if ((*addr >= '0') && (*addr <= '9')) {
1937                         new = *addr - '0';
1938                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1939                         new = *addr - 'a' + 10;
1940                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1941                         new = *addr - 'A' + 10;
1942                 } else if (*addr == '\0')
1943                         state |= END;
1944                 else
1945                         state |= DELIM;
1946                 addr++;
1947                 switch (state /* | INPUT */) {
1948                 case GOTTWO | DIGIT:
1949                         *cp++ = byte; /*FALLTHROUGH*/
1950                 case VIRGIN | DIGIT:
1951                         state = GOTONE; byte = new; continue;
1952                 case GOTONE | DIGIT:
1953                         state = GOTTWO; byte = new + (byte << 4); continue;
1954                 default: /* | DELIM */
1955                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1956                 case GOTONE | END:
1957                 case GOTTWO | END:
1958                         *cp++ = byte; /* FALLTHROUGH */
1959                 case VIRGIN | END:
1960                         break;
1961                 }
1962                 break;
1963         } while (cp < cplim);
1964         sa->sa_len = cp - (char *)sa;
1965 }