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         return (error);
 527 }
 528
 529 static const char *
 530 routename(struct sockaddr *sa)
 531 {
 532         struct sockaddr_dl *sdl;
 533         const char *cp;
 534         int n;
 535
 536         if (!domain_initialized) {
 537                 domain_initialized = true;
 538                 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
 539                     (cp = strchr(domain, '.'))) {
 540                         domain[MAXHOSTNAMELEN] = '\0';
 541                         (void)strcpy(domain, cp + 1);
 542                 } else
 543                         domain[0] = '\0';
 544         }
 545
 546         /* If the address is zero-filled, use "default". */
 547         if (sa->sa_len == 0 && nflag == 0)
 548                 return ("default");
 549 #if defined(INET) || defined(INET6)
 550         switch (sa->sa_family) {
 551 #ifdef INET
 552         case AF_INET:
 553                 /* If the address is zero-filled, use "default". */
 554                 if (nflag == 0 &&
 555                     ((struct sockaddr_in *)(void *)sa)->sin_addr.s_addr ==
 556                     INADDR_ANY)
 557                         return("default");
 558                 break;
 559 #endif
 560 #ifdef INET6
 561         case AF_INET6:
 562                 /* If the address is zero-filled, use "default". */
 563                 if (nflag == 0 &&
 564                     IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(void *)sa)->sin6_addr))
 565                         return("default");
 566                 break;
 567 #endif
 568         }
 569 #endif
 570
 571         switch (sa->sa_family) {
 572 #if defined(INET) || defined(INET6)
 573 #ifdef INET
 574         case AF_INET:
 575 #endif
 576 #ifdef INET6
 577         case AF_INET6:
 578 #endif
 579         {
 580                 struct sockaddr_storage ss;
 581                 int error;
 582                 char *p;
 583
 584                 memset(&ss, 0, sizeof(ss));
 585                 if (sa->sa_len == 0)
 586                         ss.ss_family = sa->sa_family;
 587                 else
 588                         memcpy(&ss, sa, sa->sa_len);
 589                 /* Expand sa->sa_len because it could be shortened. */
 590                 if (sa->sa_family == AF_INET)
 591                         ss.ss_len = sizeof(struct sockaddr_in);
 592                 else if (sa->sa_family == AF_INET6)
 593                         ss.ss_len = sizeof(struct sockaddr_in6);
 594                 error = getnameinfo((struct sockaddr *)&ss, ss.ss_len,
 595                     rt_line, sizeof(rt_line), NULL, 0,
 596                     (nflag == 0) ? 0 : NI_NUMERICHOST);
 597                 if (error) {
 598                         warnx("getnameinfo(): %s", gai_strerror(error));
 599                         strncpy(rt_line, "invalid", sizeof(rt_line));
 600                 }
 601
 602                 /* Remove the domain part if any. */
 603                 p = strchr(rt_line, '.');
 604                 if (p != NULL && strcmp(p + 1, domain) == 0)
 605                         *p = '\0';
 606
 607                 return (rt_line);
 608                 break;
 609         }
 610 #endif
 611         case AF_LINK:
 612                 sdl = (struct sockaddr_dl *)(void *)sa;
 613
 614                 if (sdl->sdl_nlen == 0 &&
 615                     sdl->sdl_alen == 0 &&
 616                     sdl->sdl_slen == 0) {
 617                         n = snprintf(rt_line, sizeof(rt_line), "link#%d",
 618                             sdl->sdl_index);
 619                         if (n > (int)sizeof(rt_line))
 620                             rt_line[0] = '\0';
 621                         return (rt_line);
 622                 } else
 623                         return (link_ntoa(sdl));
 624                 break;
 625
 626         default:
 627             {
 628                 u_short *sp = (u_short *)(void *)sa;
 629                 u_short *splim = sp + ((sa->sa_len + 1) >> 1);
 630                 char *cps = rt_line + sprintf(rt_line, "(%d)", sa->sa_family);
 631                 char *cpe = rt_line + sizeof(rt_line);
 632
 633                 while (++sp < splim && cps < cpe) /* start with sa->sa_data */
 634                         if ((n = snprintf(cps, cpe - cps, " %x", *sp)) > 0)
 635                                 cps += n;
 636                         else
 637                                 *cps = '\0';
 638                 break;
 639             }
 640         }
 641         return (rt_line);
 642 }
 643
 644 /*
 645  * Return the name of the network whose address is given.
 646  * The address is assumed to be that of a net, not a host.
 647  */
 648 static const char *
 649 netname(struct sockaddr *sa)
 650 {
 651         struct sockaddr_dl *sdl;
 652         int n;
 653 #ifdef INET
 654         struct netent *np = NULL;
 655         const char *cp = NULL;
 656         u_long i;
 657 #endif
 658
 659         switch (sa->sa_family) {
 660 #ifdef INET
 661         case AF_INET:
 662         {
 663                 struct in_addr in;
 664
 665                 in = ((struct sockaddr_in *)(void *)sa)->sin_addr;
 666                 i = in.s_addr = ntohl(in.s_addr);
 667                 if (in.s_addr == 0)
 668                         cp = "default";
 669                 else if (!nflag) {
 670                         np = getnetbyaddr(i, AF_INET);
 671                         if (np != NULL)
 672                                 cp = np->n_name;
 673                 }
 674 #define C(x)    (unsigned)((x) & 0xff)
 675                 if (cp != NULL)
 676                         strncpy(net_line, cp, sizeof(net_line));
 677                 else if ((in.s_addr & 0xffffff) == 0)
 678                         (void)sprintf(net_line, "%u", C(in.s_addr >> 24));
 679                 else if ((in.s_addr & 0xffff) == 0)
 680                         (void)sprintf(net_line, "%u.%u", C(in.s_addr >> 24),
 681                             C(in.s_addr >> 16));
 682                 else if ((in.s_addr & 0xff) == 0)
 683                         (void)sprintf(net_line, "%u.%u.%u", C(in.s_addr >> 24),
 684                             C(in.s_addr >> 16), C(in.s_addr >> 8));
 685                 else
 686                         (void)sprintf(net_line, "%u.%u.%u.%u", C(in.s_addr >> 24),
 687                             C(in.s_addr >> 16), C(in.s_addr >> 8),
 688                             C(in.s_addr));
 689 #undef C
 690                 break;
 691         }
 692 #endif
 693 #ifdef INET6
 694         case AF_INET6:
 695         {
 696                 struct sockaddr_in6 sin6;
 697                 int niflags = 0;
 698
 699                 memset(&sin6, 0, sizeof(sin6));
 700                 memcpy(&sin6, sa, sa->sa_len);
 701                 sin6.sin6_len = sizeof(sin6);
 702                 sin6.sin6_family = AF_INET6;
 703                 if (nflag)
 704                         niflags |= NI_NUMERICHOST;
 705                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 706                     net_line, sizeof(net_line), NULL, 0, niflags) != 0)
 707                         strncpy(net_line, "invalid", sizeof(net_line));
 708
 709                 return(net_line);
 710         }
 711 #endif
 712         case AF_LINK:
 713                 sdl = (struct sockaddr_dl *)(void *)sa;
 714
 715                 if (sdl->sdl_nlen == 0 &&
 716                     sdl->sdl_alen == 0 &&
 717                     sdl->sdl_slen == 0) {
 718                         n = snprintf(net_line, sizeof(net_line), "link#%d",
 719                             sdl->sdl_index);
 720                         if (n > (int)sizeof(net_line))
 721                             net_line[0] = '\0';
 722                         return (net_line);
 723                 } else
 724                         return (link_ntoa(sdl));
 725                 break;
 726
 727         default:
 728             {
 729                 u_short *sp = (u_short *)(void *)sa->sa_data;
 730                 u_short *splim = sp + ((sa->sa_len + 1)>>1);
 731                 char *cps = net_line + sprintf(net_line, "af %d:", sa->sa_family);
 732                 char *cpe = net_line + sizeof(net_line);
 733
 734                 while (sp < splim && cps < cpe)
 735                         if ((n = snprintf(cps, cpe - cps, " %x", *sp++)) > 0)
 736                                 cps += n;
 737                         else
 738                                 *cps = '\0';
 739                 break;
 740             }
 741         }
 742         return (net_line);
 743 }
 744
 745 static void
 746 set_metric(char *value, int key)
 747 {
 748         int flag = 0;
 749         char *endptr;
 750         u_long noval, *valp = &noval;
 751
 752         switch (key) {
 753 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
 754         caseof(K_MTU, RTV_MTU, rmx_mtu);
 755         caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
 756         caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
 757         caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
 758         caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
 759         caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
 760         caseof(K_RTT, RTV_RTT, rmx_rtt);
 761         caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
 762         caseof(K_WEIGHT, RTV_WEIGHT, rmx_weight);
 763         }
 764         rtm_inits |= flag;
 765         if (lockrest || locking)
 766                 rt_metrics.rmx_locks |= flag;
 767         if (locking)
 768                 locking = 0;
 769         errno = 0;
 770         *valp = strtol(value, &endptr, 0);
 771         if (errno == 0 && *endptr != '\0')
 772                 errno = EINVAL;
 773         if (errno)
 774                 err(EX_USAGE, "%s", value);
 775         if (flag & RTV_EXPIRE && (value[0] == '+' || value[0] == '-')) {
 776                 struct timespec ts;
 777
 778                 clock_gettime(CLOCK_REALTIME_FAST, &ts);
 779                 *valp += ts.tv_sec;
 780         }
 781 }
 782
 783 #define F_ISHOST        0x01
 784 #define F_FORCENET      0x02
 785 #define F_FORCEHOST     0x04
 786 #define F_PROXY         0x08
 787 #define F_INTERFACE     0x10
 788
 789 static void
 790 newroute(int argc, char **argv)
 791 {
 792         struct sigaction sa;
 793         struct hostent *hp;
 794         struct fibl *fl;
 795         char *cmd;
 796         const char *dest, *gateway, *errmsg;
 797         int key, error, flags, nrflags, fibnum;
 798
 799         if (uid != 0 && !debugonly && !tflag)
 800                 errx(EX_NOPERM, "must be root to alter routing table");
 801         dest = NULL;
 802         gateway = NULL;
 803         flags = RTF_STATIC;
 804         nrflags = 0;
 805         hp = NULL;
 806         TAILQ_INIT(&fibl_head);
 807
 808         sigemptyset(&sa.sa_mask);
 809         sa.sa_flags = 0;
 810         sa.sa_handler = stopit;
 811         if (sigaction(SIGALRM, &sa, 0) == -1)
 812                 warn("sigaction SIGALRM");
 813
 814         cmd = argv[0];
 815         if (*cmd != 'g' && *cmd != 's')
 816                 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 817         while (--argc > 0) {
 818                 if (**(++argv)== '-') {
 819                         switch (key = keyword(1 + *argv)) {
 820                         case K_LINK:
 821                                 af = AF_LINK;
 822                                 aflen = sizeof(struct sockaddr_dl);
 823                                 break;
 824 #ifdef INET
 825                         case K_4:
 826                         case K_INET:
 827                                 af = AF_INET;
 828                                 aflen = sizeof(struct sockaddr_in);
 829                                 break;
 830 #endif
 831 #ifdef INET6
 832                         case K_6:
 833                         case K_INET6:
 834                                 af = AF_INET6;
 835                                 aflen = sizeof(struct sockaddr_in6);
 836                                 break;
 837 #endif
 838                         case K_SA:
 839                                 af = PF_ROUTE;
 840                                 aflen = sizeof(struct sockaddr_storage);
 841                                 break;
 842                         case K_IFACE:
 843                         case K_INTERFACE:
 844                                 nrflags |= F_INTERFACE;
 845                                 break;
 846                         case K_NOSTATIC:
 847                                 flags &= ~RTF_STATIC;
 848                                 break;
 849                         case K_LOCK:
 850                                 locking = 1;
 851                                 break;
 852                         case K_LOCKREST:
 853                                 lockrest = 1;
 854                                 break;
 855                         case K_HOST:
 856                                 nrflags |= F_FORCEHOST;
 857                                 break;
 858                         case K_REJECT:
 859                                 flags |= RTF_REJECT;
 860                                 break;
 861                         case K_BLACKHOLE:
 862                                 flags |= RTF_BLACKHOLE;
 863                                 break;
 864                         case K_PROTO1:
 865                                 flags |= RTF_PROTO1;
 866                                 break;
 867                         case K_PROTO2:
 868                                 flags |= RTF_PROTO2;
 869                                 break;
 870                         case K_PROXY:
 871                                 nrflags |= F_PROXY;
 872                                 break;
 873                         case K_XRESOLVE:
 874                                 flags |= RTF_XRESOLVE;
 875                                 break;
 876                         case K_STATIC:
 877                                 flags |= RTF_STATIC;
 878                                 break;
 879                         case K_STICKY:
 880                                 flags |= RTF_STICKY;
 881                                 break;
 882                         case K_NOSTICK:
 883                                 flags &= ~RTF_STICKY;
 884                                 break;
 885                         case K_FIB:
 886                                 if (!--argc)
 887                                         usage(NULL);
 888                                 error = fiboptlist_csv(*++argv, &fibl_head);
 889                                 if (error)
 890                                         errx(EX_USAGE,
 891                                             "invalid fib number: %s", *argv);
 892                                 break;
 893                         case K_IFA:
 894                                 if (!--argc)
 895                                         usage(NULL);
 896                                 getaddr(RTAX_IFA, *++argv, 0, nrflags);
 897                                 break;
 898                         case K_IFP:
 899                                 if (!--argc)
 900                                         usage(NULL);
 901                                 getaddr(RTAX_IFP, *++argv, 0, nrflags);
 902                                 break;
 903                         case K_GENMASK:
 904                                 if (!--argc)
 905                                         usage(NULL);
 906                                 getaddr(RTAX_GENMASK, *++argv, 0, nrflags);
 907                                 break;
 908                         case K_GATEWAY:
 909                                 if (!--argc)
 910                                         usage(NULL);
 911                                 getaddr(RTAX_GATEWAY, *++argv, 0, nrflags);
 912                                 gateway = *argv;
 913                                 break;
 914                         case K_DST:
 915                                 if (!--argc)
 916                                         usage(NULL);
 917                                 if (getaddr(RTAX_DST, *++argv, &hp, nrflags))
 918                                         nrflags |= F_ISHOST;
 919                                 dest = *argv;
 920                                 break;
 921                         case K_NETMASK:
 922                                 if (!--argc)
 923                                         usage(NULL);
 924                                 getaddr(RTAX_NETMASK, *++argv, 0, nrflags);
 925                                 /* FALLTHROUGH */
 926                         case K_NET:
 927                                 nrflags |= F_FORCENET;
 928                                 break;
 929                         case K_PREFIXLEN:
 930                                 if (!--argc)
 931                                         usage(NULL);
 932                                 if (prefixlen(*++argv) == -1) {
 933                                         nrflags &= ~F_FORCENET;
 934                                         nrflags |= F_ISHOST;
 935                                 } else {
 936                                         nrflags |= F_FORCENET;
 937                                         nrflags &= ~F_ISHOST;
 938                                 }
 939                                 break;
 940                         case K_MTU:
 941                         case K_HOPCOUNT:
 942                         case K_EXPIRE:
 943                         case K_RECVPIPE:
 944                         case K_SENDPIPE:
 945                         case K_SSTHRESH:
 946                         case K_RTT:
 947                         case K_RTTVAR:
 948                         case K_WEIGHT:
 949                                 if (!--argc)
 950                                         usage(NULL);
 951                                 set_metric(*++argv, key);
 952                                 break;
 953                         default:
 954                                 usage(1+*argv);
 955                         }
 956                 } else {
 957                         if ((rtm_addrs & RTA_DST) == 0) {
 958                                 dest = *argv;
 959                                 if (getaddr(RTAX_DST, *argv, &hp, nrflags))
 960                                         nrflags |= F_ISHOST;
 961                         } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
 962                                 gateway = *argv;
 963                                 getaddr(RTAX_GATEWAY, *argv, &hp, nrflags);
 964                         } else {
 965                                 getaddr(RTAX_NETMASK, *argv, 0, nrflags);
 966                                 nrflags |= F_FORCENET;
 967                         }
 968                 }
 969         }
 970
 971         /* Do some sanity checks on resulting request */
 972         if (so[RTAX_DST].ss_len == 0) {
 973                 warnx("destination parameter required");
 974                 usage(NULL);
 975         }
 976
 977         if (so[RTAX_NETMASK].ss_len != 0 &&
 978             so[RTAX_DST].ss_family != so[RTAX_NETMASK].ss_family) {
 979                 warnx("destination and netmask family need to be the same");
 980                 usage(NULL);
 981         }
 982
 983         if (nrflags & F_FORCEHOST) {
 984                 nrflags |= F_ISHOST;
 985 #ifdef INET6
 986                 if (af == AF_INET6) {
 987                         rtm_addrs &= ~RTA_NETMASK;
 988                         memset(&so[RTAX_NETMASK], 0, sizeof(so[RTAX_NETMASK]));
 989                 }
 990 #endif
 991         }
 992         if (nrflags & F_FORCENET)
 993                 nrflags &= ~F_ISHOST;
 994         flags |= RTF_UP;
 995         if (nrflags & F_ISHOST)
 996                 flags |= RTF_HOST;
 997         if ((nrflags & F_INTERFACE) == 0)
 998                 flags |= RTF_GATEWAY;
 999         if (nrflags & F_PROXY)
1000                 flags |= RTF_ANNOUNCE;
1001         if (dest == NULL)
1002                 dest = "";
1003         if (gateway == NULL)
1004                 gateway = "";
1005
1006         if (TAILQ_EMPTY(&fibl_head)) {
1007                 error = fiboptlist_csv("default", &fibl_head);
1008                 if (error)
1009                         errx(EX_OSERR, "fiboptlist_csv failed.");
1010         }
1011         error = 0;
1012         TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1013                 fl->fl_error = newroute_fib(fl->fl_num, cmd, flags);
1014                 if (fl->fl_error)
1015                         fl->fl_errno = errno;
1016                 error += fl->fl_error;
1017         }
1018         if (*cmd == 'g' || *cmd == 's')
1019                 exit(error);
1020
1021         error = 0;
1022         if (!qflag) {
1023                 fibnum = 0;
1024                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1025                         if (fl->fl_error == 0)
1026                                 fibnum++;
1027                 }
1028                 if (fibnum > 0) {
1029                         int firstfib = 1;
1030
1031                         printf("%s %s %s", cmd,
1032                             (nrflags & F_ISHOST) ? "host" : "net", dest);
1033                         if (*gateway)
1034                                 printf(": gateway %s", gateway);
1035
1036                         if (numfibs > 1) {
1037                                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1038                                         if (fl->fl_error == 0
1039                                             && fl->fl_num >= 0) {
1040                                                 if (firstfib) {
1041                                                         printf(" fib ");
1042                                                         firstfib = 0;
1043                                                 }
1044                                                 printf("%d", fl->fl_num);
1045                                                 if (fibnum-- > 1)
1046                                                         printf(",");
1047                                         }
1048                                 }
1049                         }
1050                         printf("\n");
1051                 }
1052
1053                 fibnum = 0;
1054                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1055                         if (fl->fl_error != 0) {
1056                                 printf("%s %s %s", cmd, (nrflags & F_ISHOST)
1057                                     ? "host" : "net", dest);
1058                                 if (*gateway)
1059                                         printf(": gateway %s", gateway);
1060
1061                                 if (fl->fl_num >= 0)
1062                                         printf(" fib %d", fl->fl_num);
1063
1064                                 switch (fl->fl_errno) {
1065                                 case ESRCH:
1066                                         errmsg = "not in table";
1067                                         break;
1068                                 case EBUSY:
1069                                         errmsg = "entry in use";
1070                                         break;
1071                                 case ENOBUFS:
1072                                         errmsg = "not enough memory";
1073                                         break;
1074                                 case EADDRINUSE:
1075                                         /*
1076                                          * handle recursion avoidance
1077                                          * in rt_setgate()
1078                                          */
1079                                         errmsg = "gateway uses the same route";
1080                                         break;
1081                                 case EEXIST:
1082                                         errmsg = "route already in table";
1083                                         break;
1084                                 default:
1085                                         errmsg = strerror(fl->fl_errno);
1086                                         break;
1087                                 }
1088                                 printf(": %s\n", errmsg);
1089                                 error = 1;
1090                         }
1091                 }
1092         }
1093         exit(error);
1094 }
1095
1096 static int
1097 newroute_fib(int fib, char *cmd, int flags)
1098 {
1099         int error;
1100
1101         error = set_sofib(fib);
1102         if (error) {
1103                 warn("fib number %d is ignored", fib);
1104                 return (error);
1105         }
1106
1107         error = rtmsg(*cmd, flags, fib);
1108         return (error);
1109 }
1110
1111 #ifdef INET
1112 static void
1113 inet_makenetandmask(u_long net, struct sockaddr_in *sin,
1114     struct sockaddr_in *sin_mask, u_long bits)
1115 {
1116         u_long mask = 0;
1117
1118         rtm_addrs |= RTA_NETMASK;
1119
1120         /*
1121          * MSB of net should be meaningful. 0/0 is exception.
1122          */
1123         if (net > 0)
1124                 while ((net & 0xff000000) == 0)
1125                         net <<= 8;
1126
1127         /*
1128          * If no /xx was specified we must calculate the
1129          * CIDR address.
1130          */
1131         if ((bits == 0) && (net != 0)) {
1132                 u_long i, j;
1133
1134                 for(i = 0, j = 0xff; i < 4; i++)  {
1135                         if (net & j) {
1136                                 break;
1137                         }
1138                         j <<= 8;
1139                 }
1140                 /* i holds the first non zero bit */
1141                 bits = 32 - (i*8);
1142         }
1143         if (bits != 0)
1144                 mask = 0xffffffff << (32 - bits);
1145
1146         sin->sin_addr.s_addr = htonl(net);
1147         sin_mask->sin_addr.s_addr = htonl(mask);
1148         sin_mask->sin_len = sizeof(struct sockaddr_in);
1149         sin_mask->sin_family = AF_INET;
1150 }
1151 #endif
1152
1153 #ifdef INET6
1154 /*
1155  * XXX the function may need more improvement...
1156  */
1157 static int
1158 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
1159 {
1160
1161         if (plen == NULL) {
1162                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
1163                     sin6->sin6_scope_id == 0)
1164                         plen = "0";
1165         }
1166
1167         if (plen == NULL || strcmp(plen, "128") == 0)
1168                 return (1);
1169         rtm_addrs |= RTA_NETMASK;
1170         prefixlen(plen);
1171         return (0);
1172 }
1173 #endif
1174
1175 /*
1176  * Interpret an argument as a network address of some kind,
1177  * returning 1 if a host address, 0 if a network address.
1178  */
1179 static int
1180 getaddr(int idx, char *str, struct hostent **hpp, int nrflags)
1181 {
1182         struct sockaddr *sa;
1183 #if defined(INET)
1184         struct sockaddr_in *sin;
1185         struct hostent *hp;
1186         struct netent *np;
1187         u_long val;
1188         char *q;
1189 #elif defined(INET6)
1190         char *q;
1191 #endif
1192
1193         if (idx < 0 || idx >= RTAX_MAX)
1194                 usage("internal error");
1195         if (af == 0) {
1196 #if defined(INET)
1197                 af = AF_INET;
1198                 aflen = sizeof(struct sockaddr_in);
1199 #elif defined(INET6)
1200                 af = AF_INET6;
1201                 aflen = sizeof(struct sockaddr_in6);
1202 #else
1203                 af = AF_LINK;
1204                 aflen = sizeof(struct sockaddr_dl);
1205 #endif
1206         }
1207 #ifndef INET
1208         hpp = NULL;
1209 #endif
1210         rtm_addrs |= (1 << idx);
1211         sa = (struct sockaddr *)&so[idx];
1212         sa->sa_family = af;
1213         sa->sa_len = aflen;
1214
1215         switch (idx) {
1216         case RTAX_GATEWAY:
1217                 if (nrflags & F_INTERFACE) {
1218                         struct ifaddrs *ifap, *ifa;
1219                         struct sockaddr_dl *sdl0 = (struct sockaddr_dl *)(void *)sa;
1220                         struct sockaddr_dl *sdl = NULL;
1221
1222                         if (getifaddrs(&ifap))
1223                                 err(EX_OSERR, "getifaddrs");
1224
1225                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
1226                                 if (ifa->ifa_addr->sa_family != AF_LINK)
1227                                         continue;
1228
1229                                 if (strcmp(str, ifa->ifa_name) != 0)
1230                                         continue;
1231
1232                                 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
1233                         }
1234                         /* If we found it, then use it */
1235                         if (sdl != NULL) {
1236                                 /*
1237                                  * Note that we need to copy before calling
1238                                  * freeifaddrs().
1239                                  */
1240                                 memcpy(sdl0, sdl, sdl->sdl_len);
1241                         }
1242                         freeifaddrs(ifap);
1243                         if (sdl != NULL)
1244                                 return(1);
1245                         else
1246                                 errx(EX_DATAERR,
1247                                     "interface '%s' does not exist", str);
1248                 }
1249                 break;
1250         case RTAX_IFP:
1251                 sa->sa_family = AF_LINK;
1252                 break;
1253         }
1254         if (strcmp(str, "default") == 0) {
1255                 /*
1256                  * Default is net 0.0.0.0/0
1257                  */
1258                 switch (idx) {
1259                 case RTAX_DST:
1260                         nrflags |= F_FORCENET;
1261                         getaddr(RTAX_NETMASK, str, 0, nrflags);
1262                         break;
1263                 }
1264                 return (0);
1265         }
1266         switch (sa->sa_family) {
1267 #ifdef INET6
1268         case AF_INET6:
1269         {
1270                 struct addrinfo hints, *res;
1271                 int ecode;
1272
1273                 q = NULL;
1274                 if (idx == RTAX_DST && (q = strchr(str, '/')) != NULL)
1275                         *q = '\0';
1276                 memset(&hints, 0, sizeof(hints));
1277                 hints.ai_family = sa->sa_family;
1278                 hints.ai_socktype = SOCK_DGRAM;
1279                 ecode = getaddrinfo(str, NULL, &hints, &res);
1280                 if (ecode != 0 || res->ai_family != AF_INET6 ||
1281                     res->ai_addrlen != sizeof(struct sockaddr_in6))
1282                         errx(EX_OSERR, "%s: %s", str, gai_strerror(ecode));
1283                 memcpy(sa, res->ai_addr, res->ai_addrlen);
1284                 freeaddrinfo(res);
1285                 if (q != NULL)
1286                         *q++ = '/';
1287                 if (idx == RTAX_DST)
1288                         return (inet6_makenetandmask((struct sockaddr_in6 *)(void *)sa, q));
1289                 return (0);
1290         }
1291 #endif /* INET6 */
1292         case AF_LINK:
1293                 link_addr(str, (struct sockaddr_dl *)(void *)sa);
1294                 return (1);
1295
1296         case PF_ROUTE:
1297                 sockaddr(str, sa, sizeof(struct sockaddr_storage));
1298                 return (1);
1299 #ifdef INET
1300         case AF_INET:
1301 #endif
1302         default:
1303                 break;
1304         }
1305
1306 #ifdef INET
1307         sin = (struct sockaddr_in *)(void *)sa;
1308         if (hpp == NULL)
1309                 hpp = &hp;
1310         *hpp = NULL;
1311
1312         q = strchr(str,'/');
1313         if (q != NULL && idx == RTAX_DST) {
1314                 *q = '\0';
1315                 if ((val = inet_network(str)) != INADDR_NONE) {
1316                         inet_makenetandmask(val, sin,
1317                             (struct sockaddr_in *)&so[RTAX_NETMASK],
1318                             strtoul(q+1, 0, 0));
1319                         return (0);
1320                 }
1321                 *q = '/';
1322         }
1323         if ((idx != RTAX_DST || (nrflags & F_FORCENET) == 0) &&
1324             inet_aton(str, &sin->sin_addr)) {
1325                 val = sin->sin_addr.s_addr;
1326                 if (idx != RTAX_DST || nrflags & F_FORCEHOST ||
1327                     inet_lnaof(sin->sin_addr) != INADDR_ANY)
1328                         return (1);
1329                 else {
1330                         val = ntohl(val);
1331                         goto netdone;
1332                 }
1333         }
1334         if (idx == RTAX_DST && (nrflags & F_FORCEHOST) == 0 &&
1335             ((val = inet_network(str)) != INADDR_NONE ||
1336             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1337 netdone:
1338                 inet_makenetandmask(val, sin,
1339                     (struct sockaddr_in *)&so[RTAX_NETMASK], 0);
1340                 return (0);
1341         }
1342         hp = gethostbyname(str);
1343         if (hp != NULL) {
1344                 *hpp = hp;
1345                 sin->sin_family = hp->h_addrtype;
1346                 memmove((char *)&sin->sin_addr, hp->h_addr,
1347                     MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
1348                 return (1);
1349         }
1350 #endif
1351         errx(EX_NOHOST, "bad address: %s", str);
1352 }
1353
1354 static int
1355 prefixlen(const char *str)
1356 {
1357         int len = atoi(str), q, r;
1358         int max;
1359         char *p;
1360
1361         rtm_addrs |= RTA_NETMASK;
1362         switch (af) {
1363 #ifdef INET6
1364         case AF_INET6:
1365         {
1366                 struct sockaddr_in6 *sin6 =
1367                     (struct sockaddr_in6 *)&so[RTAX_NETMASK];
1368
1369                 max = 128;
1370                 p = (char *)&sin6->sin6_addr;
1371                 sin6->sin6_family = AF_INET6;
1372                 sin6->sin6_len = sizeof(*sin6);
1373                 break;
1374         }
1375 #endif
1376 #ifdef INET
1377         case AF_INET:
1378         {
1379                 struct sockaddr_in *sin =
1380                     (struct sockaddr_in *)&so[RTAX_NETMASK];
1381
1382                 max = 32;
1383                 p = (char *)&sin->sin_addr;
1384                 sin->sin_family = AF_INET;
1385                 sin->sin_len = sizeof(*sin);
1386                 break;
1387         }
1388 #endif
1389         default:
1390                 errx(EX_OSERR, "prefixlen not supported in this af");
1391         }
1392
1393         if (len < 0 || max < len)
1394                 errx(EX_USAGE, "%s: invalid prefixlen", str);
1395
1396         q = len >> 3;
1397         r = len & 7;
1398         memset((void *)p, 0, max / 8);
1399         if (q > 0)
1400                 memset((void *)p, 0xff, q);
1401         if (r > 0)
1402                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1403         if (len == max)
1404                 return (-1);
1405         else
1406                 return (len);
1407 }
1408
1409 static void
1410 interfaces(void)
1411 {
1412         size_t needed;
1413         int mib[6];
1414         char *buf, *lim, *next, count = 0;
1415         struct rt_msghdr *rtm;
1416
1417 retry2:
1418         mib[0] = CTL_NET;
1419         mib[1] = PF_ROUTE;
1420         mib[2] = 0;             /* protocol */
1421         mib[3] = AF_UNSPEC;
1422         mib[4] = NET_RT_IFLIST;
1423         mib[5] = 0;             /* no flags */
1424         if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
1425                 err(EX_OSERR, "route-sysctl-estimate");
1426         if ((buf = malloc(needed)) == NULL)
1427                 errx(EX_OSERR, "malloc failed");
1428         if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
1429                 if (errno == ENOMEM && count++ < 10) {
1430                         warnx("Routing table grew, retrying");
1431                         sleep(1);
1432                         free(buf);
1433                         goto retry2;
1434                 }
1435                 err(EX_OSERR, "actual retrieval of interface table");
1436         }
1437         lim = buf + needed;
1438         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1439                 rtm = (struct rt_msghdr *)(void *)next;
1440                 print_rtmsg(rtm, rtm->rtm_msglen);
1441         }
1442 }
1443
1444 static void
1445 monitor(int argc, char *argv[])
1446 {
1447         int n, fib, error;
1448         char msg[2048], *endptr;
1449
1450         fib = defaultfib;
1451         while (argc > 1) {
1452                 argc--;
1453                 argv++;
1454                 if (**argv != '-')
1455                         usage(*argv);
1456                 switch (keyword(*argv + 1)) {
1457                 case K_FIB:
1458                         if (!--argc)
1459                                 usage(*argv);
1460                         errno = 0;
1461                         fib = strtol(*++argv, &endptr, 0);
1462                         if (errno == 0) {
1463                                 if (*endptr != '\0' ||
1464                                     fib < 0 ||
1465                                     (numfibs != -1 && fib > numfibs - 1))
1466                                         errno = EINVAL;
1467                         }
1468                         if (errno)
1469                                 errx(EX_USAGE, "invalid fib number: %s", *argv);
1470                         break;
1471                 default:
1472                         usage(*argv);
1473                 }
1474         }
1475         error = set_sofib(fib);
1476         if (error)
1477                 errx(EX_USAGE, "invalid fib number: %d", fib);
1478
1479         verbose = 1;
1480         if (debugonly) {
1481                 interfaces();
1482                 exit(0);
1483         }
1484         for (;;) {
1485                 time_t now;
1486                 n = read(s, msg, 2048);
1487                 now = time(NULL);
1488                 (void)printf("\ngot message of size %d on %s", n, ctime(&now));
1489                 print_rtmsg((struct rt_msghdr *)(void *)msg, n);
1490         }
1491 }
1492
1493 static int
1494 rtmsg(int cmd, int flags, int fib)
1495 {
1496         int rlen;
1497         char *cp = m_rtmsg.m_space;
1498         int l;
1499
1500 #define NEXTADDR(w, u)                                                  \
1501         if (rtm_addrs & (w)) {                                          \
1502                 l = SA_SIZE(&(u));                                      \
1503                 memmove(cp, (char *)&(u), l);                           \
1504                 cp += l;                                                \
1505                 if (verbose)                                            \
1506                         sodump((struct sockaddr *)&(u), #w);            \
1507         }
1508
1509         errno = 0;
1510         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1511         if (cmd == 'a')
1512                 cmd = RTM_ADD;
1513         else if (cmd == 'c')
1514                 cmd = RTM_CHANGE;
1515         else if (cmd == 'g' || cmd == 's') {
1516                 cmd = RTM_GET;
1517                 if (so[RTAX_IFP].ss_family == 0) {
1518                         so[RTAX_IFP].ss_family = AF_LINK;
1519                         so[RTAX_IFP].ss_len = sizeof(struct sockaddr_dl);
1520                         rtm_addrs |= RTA_IFP;
1521                 }
1522         } else
1523                 cmd = RTM_DELETE;
1524 #define rtm m_rtmsg.m_rtm
1525         rtm.rtm_type = cmd;
1526         rtm.rtm_flags = flags;
1527         rtm.rtm_version = RTM_VERSION;
1528         rtm.rtm_seq = ++rtm_seq;
1529         rtm.rtm_addrs = rtm_addrs;
1530         rtm.rtm_rmx = rt_metrics;
1531         rtm.rtm_inits = rtm_inits;
1532
1533         NEXTADDR(RTA_DST, so[RTAX_DST]);
1534         NEXTADDR(RTA_GATEWAY, so[RTAX_GATEWAY]);
1535         NEXTADDR(RTA_NETMASK, so[RTAX_NETMASK]);
1536         NEXTADDR(RTA_GENMASK, so[RTAX_GENMASK]);
1537         NEXTADDR(RTA_IFP, so[RTAX_IFP]);
1538         NEXTADDR(RTA_IFA, so[RTAX_IFA]);
1539         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1540         if (verbose)
1541                 print_rtmsg(&rtm, l);
1542         if (debugonly)
1543                 return (0);
1544         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1545                 switch (errno) {
1546                 case EPERM:
1547                         err(1, "writing to routing socket");
1548                         break;
1549                 case ESRCH:
1550                         warnx("route has not been found");
1551                         break;
1552                 case EEXIST:
1553                         /* Handled by newroute() */
1554                         break;
1555                 default:
1556                         warn("writing to routing socket");
1557                 }
1558                 return (-1);
1559         }
1560         if (cmd == RTM_GET) {
1561                 stop_read = 0;
1562                 alarm(READ_TIMEOUT);
1563                 do {
1564                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1565                 } while (l > 0 && stop_read == 0 &&
1566                     (rtm.rtm_type != RTM_GET || rtm.rtm_seq != rtm_seq ||
1567                         rtm.rtm_pid != pid));
1568                 if (stop_read != 0) {
1569                         warnx("read from routing socket timed out");
1570                         return (-1);
1571                 } else
1572                         alarm(0);
1573                 if (l < 0)
1574                         warn("read from routing socket");
1575                 else
1576                         print_getmsg(&rtm, l, fib);
1577         }
1578 #undef rtm
1579         return (0);
1580 }
1581
1582 static const char *const msgtypes[] = {
1583         "",
1584         "RTM_ADD: Add Route",
1585         "RTM_DELETE: Delete Route",
1586         "RTM_CHANGE: Change Metrics or flags",
1587         "RTM_GET: Report Metrics",
1588         "RTM_LOSING: Kernel Suspects Partitioning",
1589         "RTM_REDIRECT: Told to use different route",
1590         "RTM_MISS: Lookup failed on this address",
1591         "RTM_LOCK: fix specified metrics",
1592         "RTM_OLDADD: caused by SIOCADDRT",
1593         "RTM_OLDDEL: caused by SIOCDELRT",
1594         "RTM_RESOLVE: Route created by cloning",
1595         "RTM_NEWADDR: address being added to iface",
1596         "RTM_DELADDR: address being removed from iface",
1597         "RTM_IFINFO: iface status change",
1598         "RTM_NEWMADDR: new multicast group membership on iface",
1599         "RTM_DELMADDR: multicast group membership removed from iface",
1600         "RTM_IFANNOUNCE: interface arrival/departure",
1601         "RTM_IEEE80211: IEEE 802.11 wireless event",
1602 };
1603
1604 static const char metricnames[] =
1605     "\011weight\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire"
1606     "\1mtu";
1607 static const char routeflags[] =
1608     "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE"
1609     "\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE"
1610     "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3"
1611     "\024FIXEDMTU\025PINNED\026LOCAL\027BROADCAST\030MULTICAST\035STICKY";
1612 static const char ifnetflags[] =
1613     "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1614     "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1615     "\017LINK2\020MULTICAST";
1616 static const char addrnames[] =
1617     "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD";
1618
1619 static const char errfmt[] =
1620     "\n%s: truncated route message, only %zu bytes left\n";
1621
1622 static void
1623 print_rtmsg(struct rt_msghdr *rtm, size_t msglen)
1624 {
1625         struct if_msghdr *ifm;
1626         struct ifa_msghdr *ifam;
1627 #ifdef RTM_NEWMADDR
1628         struct ifma_msghdr *ifmam;
1629 #endif
1630         struct if_announcemsghdr *ifan;
1631         const char *state;
1632
1633         if (verbose == 0)
1634                 return;
1635         if (rtm->rtm_version != RTM_VERSION) {
1636                 (void)printf("routing message version %d not understood\n",
1637                     rtm->rtm_version);
1638                 return;
1639         }
1640         if (rtm->rtm_type < nitems(msgtypes))
1641                 (void)printf("%s: ", msgtypes[rtm->rtm_type]);
1642         else
1643                 (void)printf("unknown type %d: ", rtm->rtm_type);
1644         (void)printf("len %d, ", rtm->rtm_msglen);
1645
1646 #define REQUIRE(x)      do {            \
1647         if (msglen < sizeof(x))         \
1648                 goto badlen;            \
1649         else                            \
1650                 msglen -= sizeof(x);    \
1651         } while (0)
1652
1653         switch (rtm->rtm_type) {
1654         case RTM_IFINFO:
1655                 REQUIRE(struct if_msghdr);
1656                 ifm = (struct if_msghdr *)rtm;
1657                 (void)printf("if# %d, ", ifm->ifm_index);
1658                 switch (ifm->ifm_data.ifi_link_state) {
1659                 case LINK_STATE_DOWN:
1660                         state = "down";
1661                         break;
1662                 case LINK_STATE_UP:
1663                         state = "up";
1664                         break;
1665                 default:
1666                         state = "unknown";
1667                         break;
1668                 }
1669                 (void)printf("link: %s, flags:", state);
1670                 printb(ifm->ifm_flags, ifnetflags);
1671                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs, msglen);
1672                 break;
1673         case RTM_NEWADDR:
1674         case RTM_DELADDR:
1675                 REQUIRE(struct ifa_msghdr);
1676                 ifam = (struct ifa_msghdr *)rtm;
1677                 (void)printf("metric %d, flags:", ifam->ifam_metric);
1678                 printb(ifam->ifam_flags, routeflags);
1679                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs, msglen);
1680                 break;
1681 #ifdef RTM_NEWMADDR
1682         case RTM_NEWMADDR:
1683         case RTM_DELMADDR:
1684                 REQUIRE(struct ifma_msghdr);
1685                 ifmam = (struct ifma_msghdr *)rtm;
1686                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs, msglen);
1687                 break;
1688 #endif
1689         case RTM_IFANNOUNCE:
1690                 REQUIRE(struct if_announcemsghdr);
1691                 ifan = (struct if_announcemsghdr *)rtm;
1692                 (void)printf("if# %d, what: ", ifan->ifan_index);
1693                 switch (ifan->ifan_what) {
1694                 case IFAN_ARRIVAL:
1695                         (void)printf("arrival");
1696                         break;
1697                 case IFAN_DEPARTURE:
1698                         printf("departure");
1699                         break;
1700                 default:
1701                         printf("#%d", ifan->ifan_what);
1702                         break;
1703                 }
1704                 printf("\n");
1705                 fflush(stdout);
1706                 break;
1707
1708         default:
1709                 if (rtm->rtm_type <= RTM_RESOLVE) {
1710                         printf("pid: %ld, seq %d, errno %d, flags:",
1711                             (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1712                         printb(rtm->rtm_flags, routeflags);
1713                         pmsg_common(rtm, msglen);
1714                 } else
1715                         printf("type: %u, len: %zu\n", rtm->rtm_type, msglen);
1716         }
1717
1718         return;
1719
1720 badlen:
1721         (void)printf(errfmt, __func__, msglen);
1722 #undef  REQUIRE
1723 }
1724
1725 static void
1726 print_getmsg(struct rt_msghdr *rtm, int msglen, int fib)
1727 {
1728         struct sockaddr *sp[RTAX_MAX];
1729         struct timespec ts;
1730         char *cp;
1731         int i;
1732
1733         memset(sp, 0, sizeof(sp));
1734         (void)printf("   route to: %s\n",
1735             routename((struct sockaddr *)&so[RTAX_DST]));
1736         if (rtm->rtm_version != RTM_VERSION) {
1737                 warnx("routing message version %d not understood",
1738                      rtm->rtm_version);
1739                 return;
1740         }
1741         if (rtm->rtm_msglen > msglen) {
1742                 warnx("message length mismatch, in packet %d, returned %d",
1743                       rtm->rtm_msglen, msglen);
1744                 return;
1745         }
1746         if (rtm->rtm_errno)  {
1747                 errno = rtm->rtm_errno;
1748                 warn("message indicates error %d", errno);
1749                 return;
1750         }
1751         cp = ((char *)(rtm + 1));
1752         for (i = 0; i < RTAX_MAX; i++)
1753                 if (rtm->rtm_addrs & (1 << i)) {
1754                         sp[i] = (struct sockaddr *)cp;
1755                         cp += SA_SIZE((struct sockaddr *)cp);
1756                 }
1757         if ((rtm->rtm_addrs & RTA_IFP) &&
1758             (sp[RTAX_IFP]->sa_family != AF_LINK ||
1759              ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen == 0))
1760                         sp[RTAX_IFP] = NULL;
1761         if (sp[RTAX_DST])
1762                 (void)printf("destination: %s\n", routename(sp[RTAX_DST]));
1763         if (sp[RTAX_NETMASK])
1764                 (void)printf("       mask: %s\n", routename(sp[RTAX_NETMASK]));
1765         if (sp[RTAX_GATEWAY] && (rtm->rtm_flags & RTF_GATEWAY))
1766                 (void)printf("    gateway: %s\n", routename(sp[RTAX_GATEWAY]));
1767         if (fib >= 0)
1768                 (void)printf("        fib: %u\n", (unsigned int)fib);
1769         if (sp[RTAX_IFP])
1770                 (void)printf("  interface: %.*s\n",
1771                     ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen,
1772                     ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_data);
1773         (void)printf("      flags: ");
1774         printb(rtm->rtm_flags, routeflags);
1775
1776 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1777 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1778         printf("\n%9s %9s %9s %9s %9s %10s %9s\n", "recvpipe",
1779             "sendpipe", "ssthresh", "rtt,msec", "mtu   ", "weight", "expire");
1780         printf("%8lu%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1781         printf("%8lu%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1782         printf("%8lu%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1783         printf("%8lu%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1784         printf("%8lu%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1785         printf("%8lu%c ", rtm->rtm_rmx.rmx_weight, lock(WEIGHT));
1786         if (rtm->rtm_rmx.rmx_expire > 0)
1787                 clock_gettime(CLOCK_REALTIME_FAST, &ts);
1788         else
1789                 ts.tv_sec = 0;
1790         printf("%8ld%c\n", (long)(rtm->rtm_rmx.rmx_expire - ts.tv_sec),
1791             lock(EXPIRE));
1792 #undef lock
1793 #undef msec
1794 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1795         if (verbose)
1796                 pmsg_common(rtm, msglen);
1797         else if (rtm->rtm_addrs &~ RTA_IGN) {
1798                 (void)printf("sockaddrs: ");
1799                 printb(rtm->rtm_addrs, addrnames);
1800                 putchar('\n');
1801         }
1802 #undef  RTA_IGN
1803 }
1804
1805 static void
1806 pmsg_common(struct rt_msghdr *rtm, size_t msglen)
1807 {
1808
1809         (void)printf("\nlocks: ");
1810         printb(rtm->rtm_rmx.rmx_locks, metricnames);
1811         (void)printf(" inits: ");
1812         printb(rtm->rtm_inits, metricnames);
1813         if (msglen > sizeof(struct rt_msghdr))
1814                 pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs,
1815                     msglen - sizeof(struct rt_msghdr));
1816         else
1817                 (void)fflush(stdout);
1818 }
1819
1820 static void
1821 pmsg_addrs(char *cp, int addrs, size_t len)
1822 {
1823         struct sockaddr *sa;
1824         int i;
1825
1826         if (addrs == 0) {
1827                 (void)putchar('\n');
1828                 return;
1829         }
1830         (void)printf("\nsockaddrs: ");
1831         printb(addrs, addrnames);
1832         putchar('\n');
1833         for (i = 0; i < RTAX_MAX; i++)
1834                 if (addrs & (1 << i)) {
1835                         sa = (struct sockaddr *)cp;
1836                         if (len == 0 || len < SA_SIZE(sa)) {
1837                                 (void)printf(errfmt, __func__, len);
1838                                 break;
1839                         }
1840                         (void)printf(" %s", routename(sa));
1841                         len -= SA_SIZE(sa);
1842                         cp += SA_SIZE(sa);
1843                 }
1844         (void)putchar('\n');
1845         (void)fflush(stdout);
1846 }
1847
1848 static void
1849 printb(int b, const char *str)
1850 {
1851         int i;
1852         int gotsome = 0;
1853
1854         if (b == 0)
1855                 return;
1856         while ((i = *str++) != 0) {
1857                 if (b & (1 << (i-1))) {
1858                         if (gotsome == 0)
1859                                 i = '<';
1860                         else
1861                                 i = ',';
1862                         putchar(i);
1863                         gotsome = 1;
1864                         for (; (i = *str) > 32; str++)
1865                                 putchar(i);
1866                 } else
1867                         while (*str > 32)
1868                                 str++;
1869         }
1870         if (gotsome)
1871                 putchar('>');
1872 }
1873
1874 int
1875 keyword(const char *cp)
1876 {
1877         const struct keytab *kt = keywords;
1878
1879         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1880                 kt++;
1881         return (kt->kt_i);
1882 }
1883
1884 static void
1885 sodump(struct sockaddr *sa, const char *which)
1886 {
1887 #ifdef INET6
1888         char nbuf[INET6_ADDRSTRLEN];
1889 #endif
1890
1891         switch (sa->sa_family) {
1892         case AF_LINK:
1893                 (void)printf("%s: link %s; ", which,
1894                     link_ntoa((struct sockaddr_dl *)(void *)sa));
1895                 break;
1896 #ifdef INET
1897         case AF_INET:
1898                 (void)printf("%s: inet %s; ", which,
1899                     inet_ntoa(((struct sockaddr_in *)(void *)sa)->sin_addr));
1900                 break;
1901 #endif
1902 #ifdef INET6
1903         case AF_INET6:
1904                 (void)printf("%s: inet6 %s; ", which, inet_ntop(sa->sa_family,
1905                     &((struct sockaddr_in6 *)(void *)sa)->sin6_addr, nbuf,
1906                     sizeof(nbuf)));
1907                 break;
1908 #endif
1909         }
1910         (void)fflush(stdout);
1911 }
1912
1913 /* States*/
1914 #define VIRGIN  0
1915 #define GOTONE  1
1916 #define GOTTWO  2
1917 /* Inputs */
1918 #define DIGIT   (4*0)
1919 #define END     (4*1)
1920 #define DELIM   (4*2)
1921
1922 static void
1923 sockaddr(char *addr, struct sockaddr *sa, size_t size)
1924 {
1925         char *cp = (char *)sa;
1926         char *cplim = cp + size;
1927         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1928
1929         memset(cp, 0, size);
1930         cp++;
1931         do {
1932                 if ((*addr >= '0') && (*addr <= '9')) {
1933                         new = *addr - '0';
1934                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1935                         new = *addr - 'a' + 10;
1936                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1937                         new = *addr - 'A' + 10;
1938                 } else if (*addr == '\0')
1939                         state |= END;
1940                 else
1941                         state |= DELIM;
1942                 addr++;
1943                 switch (state /* | INPUT */) {
1944                 case GOTTWO | DIGIT:
1945                         *cp++ = byte; /*FALLTHROUGH*/
1946                 case VIRGIN | DIGIT:
1947                         state = GOTONE; byte = new; continue;
1948                 case GOTONE | DIGIT:
1949                         state = GOTTWO; byte = new + (byte << 4); continue;
1950                 default: /* | DELIM */
1951                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1952                 case GOTONE | END:
1953                 case GOTTWO | END:
1954                         *cp++ = byte; /* FALLTHROUGH */
1955                 case VIRGIN | END:
1956                         break;
1957                 }
1958                 break;
1959         } while (cp < cplim);
1960         sa->sa_len = cp - (char *)sa;
1961 }