sbin/route/route.c

   1 /*
   2  * Copyright (c) 1983, 1989, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1983, 1989, 1991, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)route.c     8.6 (Berkeley) 4/28/95";
  39 #endif
  40 #endif /* not lint */
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/file.h>
  47 #include <sys/socket.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/types.h>
  51 #include <sys/queue.h>
  52
  53 #include <net/if.h>
  54 #include <net/route.h>
  55 #include <net/if_dl.h>
  56 #include <netinet/in.h>
  57 #include <netinet/if_ether.h>
  58 #include <netatalk/at.h>
  59 #include <arpa/inet.h>
  60 #include <netdb.h>
  61
  62 #include <ctype.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <paths.h>
  66 #include <stdio.h>
  67 #include <stdlib.h>
  68 #include <string.h>
  69 #include <sysexits.h>
  70 #include <unistd.h>
  71 #include <ifaddrs.h>
  72
  73 static struct keytab {
  74         const char      *kt_cp;
  75         int     kt_i;
  76 } keywords[] = {
  77 #include "keywords.h"
  78         {0, 0}
  79 };
  80
  81 static struct sockaddr_storage so[RTAX_MAX];
  82 static int      pid, rtm_addrs;
  83 static int      s;
  84 static int      nflag, af, qflag, tflag;
  85 static int      verbose, aflen;
  86 static int      locking, lockrest, debugonly;
  87 static struct rt_metrics rt_metrics;
  88 static u_long  rtm_inits;
  89 static uid_t    uid;
  90 static int      defaultfib;
  91 static int      numfibs;
  92
  93 static int      atalk_aton(const char *, struct at_addr *);
  94 static char     *atalk_ntoa(struct at_addr);
  95 static void     printb(int, const char *);
  96 static void     flushroutes(int argc, char *argv[]);
  97 static int      flushroutes_fib(int);
  98 static int      getaddr(int, char *, struct hostent **, int);
  99 static int      keyword(const char *);
 100 #ifdef INET
 101 static void     inet_makenetandmask(u_long, struct sockaddr_in *,
 102                     struct sockaddr_in *, u_long);
 103 #endif
 104 #ifdef INET6
 105 static int      inet6_makenetandmask(struct sockaddr_in6 *, const char *);
 106 #endif
 107 static void     interfaces(void);
 108 static void     monitor(int, char*[]);
 109 static const char       *netname(struct sockaddr *);
 110 static void     newroute(int, char **);
 111 static int      newroute_fib(int, char *, int);
 112 static void     pmsg_addrs(char *, int, size_t);
 113 static void     pmsg_common(struct rt_msghdr *, size_t);
 114 static int      prefixlen(const char *);
 115 static void     print_getmsg(struct rt_msghdr *, int, int);
 116 static void     print_rtmsg(struct rt_msghdr *, size_t);
 117 static const char       *routename(struct sockaddr *);
 118 static int      rtmsg(int, int, int);
 119 static void     set_metric(char *, int);
 120 static int      set_sofib(int);
 121 static void     sockaddr(char *, struct sockaddr *, size_t);
 122 static void     sodump(struct sockaddr *, const char *);
 123
 124 struct fibl {
 125         TAILQ_ENTRY(fibl)       fl_next;
 126
 127         int     fl_num;
 128         int     fl_error;
 129         int     fl_errno;
 130 };
 131 static TAILQ_HEAD(fibl_head_t, fibl) fibl_head;
 132
 133 static int      fiboptlist_csv(const char *, struct fibl_head_t *);
 134 static int      fiboptlist_range(const char *, struct fibl_head_t *);
 135
 136 static void usage(const char *) __dead2;
 137
 138 static void
 139 usage(const char *cp)
 140 {
 141         if (cp != NULL)
 142                 warnx("bad keyword: %s", cp);
 143         errx(EX_USAGE, "usage: route [-46dnqtv] command [[modifiers] args]");
 144         /* NOTREACHED */
 145 }
 146
 147 int
 148 main(int argc, char **argv)
 149 {
 150         int ch;
 151         size_t len;
 152
 153         if (argc < 2)
 154                 usage(NULL);
 155
 156         while ((ch = getopt(argc, argv, "46nqdtv")) != -1)
 157                 switch(ch) {
 158                 case '4':
 159 #ifdef INET
 160                         af = AF_INET;
 161                         aflen = sizeof(struct sockaddr_in);
 162 #else
 163                         errx(1, "IPv4 support is not compiled in");
 164 #endif
 165                         break;
 166                 case '6':
 167 #ifdef INET6
 168                         af = AF_INET6;
 169                         aflen = sizeof(struct sockaddr_in6);
 170 #else
 171                         errx(1, "IPv6 support is not compiled in");
 172 #endif
 173                         break;
 174                 case 'n':
 175                         nflag = 1;
 176                         break;
 177                 case 'q':
 178                         qflag = 1;
 179                         break;
 180                 case 'v':
 181                         verbose = 1;
 182                         break;
 183                 case 't':
 184                         tflag = 1;
 185                         break;
 186                 case 'd':
 187                         debugonly = 1;
 188                         break;
 189                 case '?':
 190                 default:
 191                         usage(NULL);
 192                 }
 193         argc -= optind;
 194         argv += optind;
 195
 196         pid = getpid();
 197         uid = geteuid();
 198         if (tflag)
 199                 s = open(_PATH_DEVNULL, O_WRONLY, 0);
 200         else
 201                 s = socket(PF_ROUTE, SOCK_RAW, 0);
 202         if (s < 0)
 203                 err(EX_OSERR, "socket");
 204
 205         len = sizeof(numfibs);
 206         if (sysctlbyname("net.fibs", (void *)&numfibs, &len, NULL, 0) == -1)
 207                 numfibs = -1;
 208
 209         len = sizeof(defaultfib);
 210         if (numfibs != -1 &&
 211             sysctlbyname("net.my_fibnum", (void *)&defaultfib, &len, NULL,
 212                 0) == -1)
 213                 defaultfib = -1;
 214
 215         if (*argv != NULL)
 216                 switch (keyword(*argv)) {
 217                 case K_GET:
 218                 case K_SHOW:
 219                         uid = 0;
 220                         /* FALLTHROUGH */
 221
 222                 case K_CHANGE:
 223                 case K_ADD:
 224                 case K_DEL:
 225                 case K_DELETE:
 226                         newroute(argc, argv);
 227                         /* NOTREACHED */
 228
 229                 case K_MONITOR:
 230                         monitor(argc, argv);
 231                         /* NOTREACHED */
 232
 233                 case K_FLUSH:
 234                         flushroutes(argc, argv);
 235                         exit(0);
 236                         /* NOTREACHED */
 237                 }
 238         usage(*argv);
 239         /* NOTREACHED */
 240 }
 241
 242 static int
 243 set_sofib(int fib)
 244 {
 245
 246         if (fib < 0)
 247                 return (0);
 248         return (setsockopt(s, SOL_SOCKET, SO_SETFIB, (void *)&fib,
 249             sizeof(fib)));
 250 }
 251
 252 static int
 253 fiboptlist_range(const char *arg, struct fibl_head_t *flh)
 254 {
 255         struct fibl *fl;
 256         char *str0, *str, *token, *endptr;
 257         int fib[2], i, error;
 258
 259         str0 = str = strdup(arg);
 260         error = 0;
 261         i = 0;
 262         while ((token = strsep(&str, "-")) != NULL) {
 263                 switch (i) {
 264                 case 0:
 265                 case 1:
 266                         errno = 0;
 267                         fib[i] = strtol(token, &endptr, 0);
 268                         if (errno == 0) {
 269                                 if (*endptr != '\0' ||
 270                                     fib[i] < 0 ||
 271                                     (numfibs != -1 && fib[i] > numfibs - 1))
 272                                         errno = EINVAL;
 273                         }
 274                         if (errno)
 275                                 error = 1;
 276                         break;
 277                 default:
 278                         error = 1;
 279                 }
 280                 if (error)
 281                         goto fiboptlist_range_ret;
 282                 i++;
 283         }
 284         if (fib[0] >= fib[1]) {
 285                 error = 1;
 286                 goto fiboptlist_range_ret;
 287         }
 288         for (i = fib[0]; i <= fib[1]; i++) {
 289                 fl = calloc(1, sizeof(*fl));
 290                 if (fl == NULL) {
 291                         error = 1;
 292                         goto fiboptlist_range_ret;
 293                 }
 294                 fl->fl_num = i;
 295                 TAILQ_INSERT_TAIL(flh, fl, fl_next);
 296         }
 297 fiboptlist_range_ret:
 298         free(str0);
 299         return (error);
 300 }
 301
 302 #define ALLSTRLEN       64
 303 static int
 304 fiboptlist_csv(const char *arg, struct fibl_head_t *flh)
 305 {
 306         struct fibl *fl;
 307         char *str0, *str, *token, *endptr;
 308         int fib, error;
 309
 310         str0 = str = NULL;
 311         if (strcmp("all", arg) == 0) {
 312                 str = calloc(1, ALLSTRLEN);
 313                 if (str == NULL) {
 314                         error = 1;
 315                         goto fiboptlist_csv_ret;
 316                 }
 317                 if (numfibs > 1)
 318                         snprintf(str, ALLSTRLEN - 1, "%d-%d", 0, numfibs - 1);
 319                 else
 320                         snprintf(str, ALLSTRLEN - 1, "%d", 0);
 321         } else if (strcmp("default", arg) == 0) {
 322                 str0 = str = calloc(1, ALLSTRLEN);
 323                 if (str == NULL) {
 324                         error = 1;
 325                         goto fiboptlist_csv_ret;
 326                 }
 327                 snprintf(str, ALLSTRLEN - 1, "%d", defaultfib);
 328         } else
 329                 str0 = str = strdup(arg);
 330
 331         error = 0;
 332         while ((token = strsep(&str, ",")) != NULL) {
 333                 if (*token != '-' && strchr(token, '-') != NULL) {
 334                         error = fiboptlist_range(token, flh);
 335                         if (error)
 336                                 goto fiboptlist_csv_ret;
 337                 } else {
 338                         errno = 0;
 339                         fib = strtol(token, &endptr, 0);
 340                         if (errno == 0) {
 341                                 if (*endptr != '\0' ||
 342                                     fib < 0 ||
 343                                     (numfibs != -1 && fib > numfibs - 1))
 344                                         errno = EINVAL;
 345                         }
 346                         if (errno) {
 347                                 error = 1;
 348                                 goto fiboptlist_csv_ret;
 349                         }
 350                         fl = calloc(1, sizeof(*fl));
 351                         if (fl == NULL) {
 352                                 error = 1;
 353                                 goto fiboptlist_csv_ret;
 354                         }
 355                         fl->fl_num = fib;
 356                         TAILQ_INSERT_TAIL(flh, fl, fl_next);
 357                 }
 358         }
 359 fiboptlist_csv_ret:
 360         if (str0 != NULL)
 361                 free(str0);
 362         return (error);
 363 }
 364
 365 /*
 366  * Purge all entries in the routing tables not
 367  * associated with network interfaces.
 368  */
 369 static void
 370 flushroutes(int argc, char *argv[])
 371 {
 372         struct fibl *fl;
 373         int error;
 374
 375         if (uid != 0 && !debugonly && !tflag)
 376                 errx(EX_NOPERM, "must be root to alter routing table");
 377         shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 378
 379         TAILQ_INIT(&fibl_head);
 380         while (argc > 1) {
 381                 argc--;
 382                 argv++;
 383                 if (**argv != '-')
 384                         usage(*argv);
 385                 switch (keyword(*argv + 1)) {
 386 #ifdef INET
 387                 case K_4:
 388                 case K_INET:
 389                         af = AF_INET;
 390                         break;
 391 #endif
 392 #ifdef INET6
 393                 case K_6:
 394                 case K_INET6:
 395                         af = AF_INET6;
 396                         break;
 397 #endif
 398                 case K_ATALK:
 399                         af = AF_APPLETALK;
 400                         break;
 401                 case K_LINK:
 402                         af = AF_LINK;
 403                         break;
 404                 case K_FIB:
 405                         if (!--argc)
 406                                 usage(*argv);
 407                         error = fiboptlist_csv(*++argv, &fibl_head);
 408                         if (error)
 409                                 errx(EX_USAGE, "invalid fib number: %s", *argv);
 410                         break;
 411                 default:
 412                         usage(*argv);
 413                 }
 414         }
 415         if (TAILQ_EMPTY(&fibl_head)) {
 416                 error = fiboptlist_csv("default", &fibl_head);
 417                 if (error)
 418                         errx(EX_OSERR, "fiboptlist_csv failed.");
 419         }
 420         TAILQ_FOREACH(fl, &fibl_head, fl_next)
 421                 flushroutes_fib(fl->fl_num);
 422 }
 423
 424 static int
 425 flushroutes_fib(int fib)
 426 {
 427         struct rt_msghdr *rtm;
 428         size_t needed;
 429         char *buf, *next, *lim;
 430         int mib[7], rlen, seqno, count = 0;
 431         int error;
 432
 433         error = set_sofib(fib);
 434         if (error) {
 435                 warn("fib number %d is ignored", fib);
 436                 return (error);
 437         }
 438
 439 retry:
 440         mib[0] = CTL_NET;
 441         mib[1] = PF_ROUTE;
 442         mib[2] = 0;             /* protocol */
 443         mib[3] = AF_UNSPEC;
 444         mib[4] = NET_RT_DUMP;
 445         mib[5] = 0;             /* no flags */
 446         mib[6] = fib;
 447         if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
 448                 err(EX_OSERR, "route-sysctl-estimate");
 449         if ((buf = malloc(needed)) == NULL)
 450                 errx(EX_OSERR, "malloc failed");
 451         if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
 452                 if (errno == ENOMEM && count++ < 10) {
 453                         warnx("Routing table grew, retrying");
 454                         sleep(1);
 455                         free(buf);
 456                         goto retry;
 457                 }
 458                 err(EX_OSERR, "route-sysctl-get");
 459         }
 460         lim = buf + needed;
 461         if (verbose)
 462                 (void)printf("Examining routing table from sysctl\n");
 463         seqno = 0;              /* ??? */
 464         for (next = buf; next < lim; next += rtm->rtm_msglen) {
 465                 rtm = (struct rt_msghdr *)(void *)next;
 466                 if (verbose)
 467                         print_rtmsg(rtm, rtm->rtm_msglen);
 468                 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
 469                         continue;
 470                 if (af != 0) {
 471                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 472
 473                         if (sa->sa_family != af)
 474                                 continue;
 475                 }
 476                 if (debugonly)
 477                         continue;
 478                 rtm->rtm_type = RTM_DELETE;
 479                 rtm->rtm_seq = seqno;
 480                 rlen = write(s, next, rtm->rtm_msglen);
 481                 if (rlen < 0 && errno == EPERM)
 482                         err(1, "write to routing socket");
 483                 if (rlen < (int)rtm->rtm_msglen) {
 484                         warn("write to routing socket");
 485                         (void)printf("got only %d for rlen\n", rlen);
 486                         free(buf);
 487                         goto retry;
 488                         break;
 489                 }
 490                 seqno++;
 491                 if (qflag)
 492                         continue;
 493                 if (verbose)
 494                         print_rtmsg(rtm, rlen);
 495                 else {
 496                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 497
 498                         printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
 499                             routename(sa) : netname(sa));
 500                         sa = (struct sockaddr *)(SA_SIZE(sa) + (char *)sa);
 501                         printf("%-20.20s ", routename(sa));
 502                         if (fib >= 0)
 503                                 printf("-fib %-3d ", fib);
 504                         printf("done\n");
 505                 }
 506         }
 507         return (error);
 508 }
 509
 510 static const char *
 511 routename(struct sockaddr *sa)
 512 {
 513         struct sockaddr_dl *sdl;
 514         const char *cp;
 515         static char line[NI_MAXHOST];
 516         static char domain[MAXHOSTNAMELEN + 1];
 517         static int first = 1, n;
 518
 519         if (first) {
 520                 first = 0;
 521                 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
 522                     (cp = strchr(domain, '.'))) {
 523                         domain[MAXHOSTNAMELEN] = '\0';
 524                         (void)strcpy(domain, cp + 1);
 525                 } else
 526                         domain[0] = '\0';
 527         }
 528
 529         /* If the address is zero-filled, use "default". */
 530         if (sa->sa_len == 0 && nflag == 0)
 531                 return ("default");
 532 #if defined(INET) || defined(INET6)
 533         switch (sa->sa_family) {
 534 #ifdef INET
 535         case AF_INET:
 536                 /* If the address is zero-filled, use "default". */
 537                 if (nflag == 0 &&
 538                     ((struct sockaddr_in *)(void *)sa)->sin_addr.s_addr ==
 539                     INADDR_ANY)
 540                         return("default");
 541                 break;
 542 #endif
 543 #ifdef INET6
 544         case AF_INET6:
 545                 /* If the address is zero-filled, use "default". */
 546                 if (nflag == 0 &&
 547                     IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(void *)sa)->sin6_addr))
 548                         return("default");
 549                 break;
 550 #endif
 551         }
 552 #endif
 553
 554         switch (sa->sa_family) {
 555 #if defined(INET) || defined(INET6)
 556 #ifdef INET
 557         case AF_INET:
 558 #endif
 559 #ifdef INET6
 560         case AF_INET6:
 561 #endif
 562         {
 563                 struct sockaddr_storage ss;
 564                 int error;
 565                 char *p;
 566
 567                 memset(&ss, 0, sizeof(ss));
 568                 if (sa->sa_len == 0)
 569                         ss.ss_family = sa->sa_family;
 570                 else
 571                         memcpy(&ss, sa, sa->sa_len);
 572                 /* Expand sa->sa_len because it could be shortened. */
 573                 if (sa->sa_family == AF_INET)
 574                         ss.ss_len = sizeof(struct sockaddr_in);
 575                 else if (sa->sa_family == AF_INET6)
 576                         ss.ss_len = sizeof(struct sockaddr_in6);
 577                 error = getnameinfo((struct sockaddr *)&ss, ss.ss_len,
 578                     line, sizeof(line), NULL, 0,
 579                     (nflag == 0) ? 0 : NI_NUMERICHOST);
 580                 if (error) {
 581                         warnx("getnameinfo(): %s", gai_strerror(error));
 582                         strncpy(line, "invalid", sizeof(line));
 583                 }
 584
 585                 /* Remove the domain part if any. */
 586                 p = strchr(line, '.');
 587                 if (p != NULL && strcmp(p + 1, domain) == 0)
 588                         *p = '\0';
 589
 590                 return (line);
 591                 break;
 592         }
 593 #endif
 594         case AF_APPLETALK:
 595                 (void)snprintf(line, sizeof(line), "atalk %s",
 596                     atalk_ntoa(((struct sockaddr_at *)(void *)sa)->sat_addr));
 597                 break;
 598
 599         case AF_LINK:
 600                 sdl = (struct sockaddr_dl *)(void *)sa;
 601
 602                 if (sdl->sdl_nlen == 0 &&
 603                     sdl->sdl_alen == 0 &&
 604                     sdl->sdl_slen == 0) {
 605                         n = snprintf(line, sizeof(line), "link#%d",
 606                             sdl->sdl_index);
 607                         if (n > (int)sizeof(line))
 608                             line[0] = '\0';
 609                         return (line);
 610                 } else
 611                         return (link_ntoa(sdl));
 612                 break;
 613
 614         default:
 615             {
 616                 u_short *sp = (u_short *)(void *)sa;
 617                 u_short *splim = sp + ((sa->sa_len + 1) >> 1);
 618                 char *cps = line + sprintf(line, "(%d)", sa->sa_family);
 619                 char *cpe = line + sizeof(line);
 620
 621                 while (++sp < splim && cps < cpe) /* start with sa->sa_data */
 622                         if ((n = snprintf(cps, cpe - cps, " %x", *sp)) > 0)
 623                                 cps += n;
 624                         else
 625                                 *cps = '\0';
 626                 break;
 627             }
 628         }
 629         return (line);
 630 }
 631
 632 /*
 633  * Return the name of the network whose address is given.
 634  * The address is assumed to be that of a net, not a host.
 635  */
 636 static const char *
 637 netname(struct sockaddr *sa)
 638 {
 639         struct sockaddr_dl *sdl;
 640         static char line[MAXHOSTNAMELEN + 1];
 641         int n;
 642 #ifdef INET
 643         struct netent *np = NULL;
 644         const char *cp = NULL;
 645         u_long i;
 646 #endif
 647
 648         switch (sa->sa_family) {
 649 #ifdef INET
 650         case AF_INET:
 651         {
 652                 struct in_addr in;
 653
 654                 in = ((struct sockaddr_in *)(void *)sa)->sin_addr;
 655                 i = in.s_addr = ntohl(in.s_addr);
 656                 if (in.s_addr == 0)
 657                         cp = "default";
 658                 else if (!nflag) {
 659                         np = getnetbyaddr(i, AF_INET);
 660                         if (np != NULL)
 661                                 cp = np->n_name;
 662                 }
 663 #define C(x)    (unsigned)((x) & 0xff)
 664                 if (cp != NULL)
 665                         strncpy(line, cp, sizeof(line));
 666                 else if ((in.s_addr & 0xffffff) == 0)
 667                         (void)sprintf(line, "%u", C(in.s_addr >> 24));
 668                 else if ((in.s_addr & 0xffff) == 0)
 669                         (void)sprintf(line, "%u.%u", C(in.s_addr >> 24),
 670                             C(in.s_addr >> 16));
 671                 else if ((in.s_addr & 0xff) == 0)
 672                         (void)sprintf(line, "%u.%u.%u", C(in.s_addr >> 24),
 673                             C(in.s_addr >> 16), C(in.s_addr >> 8));
 674                 else
 675                         (void)sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
 676                             C(in.s_addr >> 16), C(in.s_addr >> 8),
 677                             C(in.s_addr));
 678 #undef C
 679                 break;
 680         }
 681 #endif
 682 #ifdef INET6
 683         case AF_INET6:
 684         {
 685                 struct sockaddr_in6 sin6;
 686                 int niflags = 0;
 687
 688                 memset(&sin6, 0, sizeof(sin6));
 689                 memcpy(&sin6, sa, sa->sa_len);
 690                 sin6.sin6_len = sizeof(sin6);
 691                 sin6.sin6_family = AF_INET6;
 692                 if (nflag)
 693                         niflags |= NI_NUMERICHOST;
 694                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 695                     line, sizeof(line), NULL, 0, niflags) != 0)
 696                         strncpy(line, "invalid", sizeof(line));
 697
 698                 return(line);
 699         }
 700 #endif
 701
 702         case AF_APPLETALK:
 703                 (void)snprintf(line, sizeof(line), "atalk %s",
 704                     atalk_ntoa(((struct sockaddr_at *)(void *)sa)->sat_addr));
 705                 break;
 706
 707         case AF_LINK:
 708                 sdl = (struct sockaddr_dl *)(void *)sa;
 709
 710                 if (sdl->sdl_nlen == 0 &&
 711                     sdl->sdl_alen == 0 &&
 712                     sdl->sdl_slen == 0) {
 713                         n = snprintf(line, sizeof(line), "link#%d",
 714                             sdl->sdl_index);
 715                         if (n > (int)sizeof(line))
 716                             line[0] = '\0';
 717                         return (line);
 718                 } else
 719                         return (link_ntoa(sdl));
 720                 break;
 721
 722         default:
 723             {
 724                 u_short *sp = (u_short *)(void *)sa->sa_data;
 725                 u_short *splim = sp + ((sa->sa_len + 1)>>1);
 726                 char *cps = line + sprintf(line, "af %d:", sa->sa_family);
 727                 char *cpe = line + sizeof(line);
 728
 729                 while (sp < splim && cps < cpe)
 730                         if ((n = snprintf(cps, cpe - cps, " %x", *sp++)) > 0)
 731                                 cps += n;
 732                         else
 733                                 *cps = '\0';
 734                 break;
 735             }
 736         }
 737         return (line);
 738 }
 739
 740 static void
 741 set_metric(char *value, int key)
 742 {
 743         int flag = 0;
 744         u_long noval, *valp = &noval;
 745
 746         switch (key) {
 747 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
 748         caseof(K_MTU, RTV_MTU, rmx_mtu);
 749         caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
 750         caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
 751         caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
 752         caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
 753         caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
 754         caseof(K_RTT, RTV_RTT, rmx_rtt);
 755         caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
 756         caseof(K_WEIGHT, RTV_WEIGHT, rmx_weight);
 757         }
 758         rtm_inits |= flag;
 759         if (lockrest || locking)
 760                 rt_metrics.rmx_locks |= flag;
 761         if (locking)
 762                 locking = 0;
 763         *valp = atoi(value);
 764 }
 765
 766 #define F_ISHOST        0x01
 767 #define F_FORCENET      0x02
 768 #define F_FORCEHOST     0x04
 769 #define F_PROXY         0x08
 770 #define F_INTERFACE     0x10
 771
 772 static void
 773 newroute(int argc, char **argv)
 774 {
 775         struct hostent *hp;
 776         struct fibl *fl;
 777         char *cmd;
 778         const char *dest, *gateway, *errmsg;
 779         int key, error, flags, nrflags, fibnum;
 780
 781         if (uid != 0 && !debugonly && !tflag)
 782                 errx(EX_NOPERM, "must be root to alter routing table");
 783         dest = NULL;
 784         gateway = NULL;
 785         flags = RTF_STATIC;
 786         nrflags = 0;
 787         hp = NULL;
 788         TAILQ_INIT(&fibl_head);
 789
 790         cmd = argv[0];
 791         if (*cmd != 'g' && *cmd != 's')
 792                 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 793         while (--argc > 0) {
 794                 if (**(++argv)== '-') {
 795                         switch (key = keyword(1 + *argv)) {
 796                         case K_LINK:
 797                                 af = AF_LINK;
 798                                 aflen = sizeof(struct sockaddr_dl);
 799                                 break;
 800 #ifdef INET
 801                         case K_4:
 802                         case K_INET:
 803                                 af = AF_INET;
 804                                 aflen = sizeof(struct sockaddr_in);
 805                                 break;
 806 #endif
 807 #ifdef INET6
 808                         case K_6:
 809                         case K_INET6:
 810                                 af = AF_INET6;
 811                                 aflen = sizeof(struct sockaddr_in6);
 812                                 break;
 813 #endif
 814                         case K_ATALK:
 815                                 af = AF_APPLETALK;
 816                                 aflen = sizeof(struct sockaddr_at);
 817                                 break;
 818                         case K_SA:
 819                                 af = PF_ROUTE;
 820                                 aflen = sizeof(struct sockaddr_storage);
 821                                 break;
 822                         case K_IFACE:
 823                         case K_INTERFACE:
 824                                 nrflags |= F_INTERFACE;
 825                                 break;
 826                         case K_NOSTATIC:
 827                                 flags &= ~RTF_STATIC;
 828                                 break;
 829                         case K_LOCK:
 830                                 locking = 1;
 831                                 break;
 832                         case K_LOCKREST:
 833                                 lockrest = 1;
 834                                 break;
 835                         case K_HOST:
 836                                 nrflags |= F_FORCEHOST;
 837                                 break;
 838                         case K_REJECT:
 839                                 flags |= RTF_REJECT;
 840                                 break;
 841                         case K_BLACKHOLE:
 842                                 flags |= RTF_BLACKHOLE;
 843                                 break;
 844                         case K_PROTO1:
 845                                 flags |= RTF_PROTO1;
 846                                 break;
 847                         case K_PROTO2:
 848                                 flags |= RTF_PROTO2;
 849                                 break;
 850                         case K_PROXY:
 851                                 nrflags |= F_PROXY;
 852                                 break;
 853                         case K_XRESOLVE:
 854                                 flags |= RTF_XRESOLVE;
 855                                 break;
 856                         case K_STATIC:
 857                                 flags |= RTF_STATIC;
 858                                 break;
 859                         case K_STICKY:
 860                                 flags |= RTF_STICKY;
 861                                 break;
 862                         case K_NOSTICK:
 863                                 flags &= ~RTF_STICKY;
 864                                 break;
 865                         case K_FIB:
 866                                 if (!--argc)
 867                                         usage(NULL);
 868                                 error = fiboptlist_csv(*++argv, &fibl_head);
 869                                 if (error)
 870                                         errx(EX_USAGE,
 871                                             "invalid fib number: %s", *argv);
 872                                 break;
 873                         case K_IFA:
 874                                 if (!--argc)
 875                                         usage(NULL);
 876                                 getaddr(RTAX_IFA, *++argv, 0, nrflags);
 877                                 break;
 878                         case K_IFP:
 879                                 if (!--argc)
 880                                         usage(NULL);
 881                                 getaddr(RTAX_IFP, *++argv, 0, nrflags);
 882                                 break;
 883                         case K_GENMASK:
 884                                 if (!--argc)
 885                                         usage(NULL);
 886                                 getaddr(RTAX_GENMASK, *++argv, 0, nrflags);
 887                                 break;
 888                         case K_GATEWAY:
 889                                 if (!--argc)
 890                                         usage(NULL);
 891                                 getaddr(RTAX_GATEWAY, *++argv, 0, nrflags);
 892                                 gateway = *argv;
 893                                 break;
 894                         case K_DST:
 895                                 if (!--argc)
 896                                         usage(NULL);
 897                                 if (getaddr(RTAX_DST, *++argv, &hp, nrflags))
 898                                         nrflags |= F_ISHOST;
 899                                 dest = *argv;
 900                                 break;
 901                         case K_NETMASK:
 902                                 if (!--argc)
 903                                         usage(NULL);
 904                                 getaddr(RTAX_NETMASK, *++argv, 0, nrflags);
 905                                 /* FALLTHROUGH */
 906                         case K_NET:
 907                                 nrflags |= F_FORCENET;
 908                                 break;
 909                         case K_PREFIXLEN:
 910                                 if (!--argc)
 911                                         usage(NULL);
 912                                 if (prefixlen(*++argv) == -1) {
 913                                         nrflags &= ~F_FORCENET;
 914                                         nrflags |= F_ISHOST;
 915                                 } else {
 916                                         nrflags |= F_FORCENET;
 917                                         nrflags &= ~F_ISHOST;
 918                                 }
 919                                 break;
 920                         case K_MTU:
 921                         case K_HOPCOUNT:
 922                         case K_EXPIRE:
 923                         case K_RECVPIPE:
 924                         case K_SENDPIPE:
 925                         case K_SSTHRESH:
 926                         case K_RTT:
 927                         case K_RTTVAR:
 928                         case K_WEIGHT:
 929                                 if (!--argc)
 930                                         usage(NULL);
 931                                 set_metric(*++argv, key);
 932                                 break;
 933                         default:
 934                                 usage(1+*argv);
 935                         }
 936                 } else {
 937                         if ((rtm_addrs & RTA_DST) == 0) {
 938                                 dest = *argv;
 939                                 if (getaddr(RTAX_DST, *argv, &hp, nrflags))
 940                                         nrflags |= F_ISHOST;
 941                         } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
 942                                 gateway = *argv;
 943                                 getaddr(RTAX_GATEWAY, *argv, &hp, nrflags);
 944                         } else {
 945                                 getaddr(RTAX_NETMASK, *argv, 0, nrflags);
 946                                 nrflags |= F_FORCENET;
 947                         }
 948                 }
 949         }
 950
 951         if (so[RTAX_DST].ss_len == 0) {
 952                 warnx("destination parameter required");
 953                 usage(NULL);
 954         }
 955
 956         if (nrflags & F_FORCEHOST) {
 957                 nrflags |= F_ISHOST;
 958 #ifdef INET6
 959                 if (af == AF_INET6) {
 960                         rtm_addrs &= ~RTA_NETMASK;
 961                         memset(&so[RTAX_NETMASK], 0, sizeof(so[RTAX_NETMASK]));
 962                 }
 963 #endif
 964         }
 965         if (nrflags & F_FORCENET)
 966                 nrflags &= ~F_ISHOST;
 967         flags |= RTF_UP;
 968         if (nrflags & F_ISHOST)
 969                 flags |= RTF_HOST;
 970         if ((nrflags & F_INTERFACE) == 0)
 971                 flags |= RTF_GATEWAY;
 972         if (nrflags & F_PROXY)
 973                 flags |= RTF_ANNOUNCE;
 974         if (dest == NULL)
 975                 dest = "";
 976         if (gateway == NULL)
 977                 gateway = "";
 978
 979         if (TAILQ_EMPTY(&fibl_head)) {
 980                 error = fiboptlist_csv("default", &fibl_head);
 981                 if (error)
 982                         errx(EX_OSERR, "fiboptlist_csv failed.");
 983         }
 984         error = 0;
 985         TAILQ_FOREACH(fl, &fibl_head, fl_next) {
 986                 fl->fl_error = newroute_fib(fl->fl_num, cmd, flags);
 987                 if (fl->fl_error)
 988                         fl->fl_errno = errno;
 989                 error += fl->fl_error;
 990         }
 991         if (*cmd == 'g' || *cmd == 's')
 992                 exit(error);
 993
 994         error = 0;
 995         if (!qflag) {
 996                 fibnum = 0;
 997                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
 998                         if (fl->fl_error == 0)
 999                                 fibnum++;
1000                 }
1001                 if (fibnum > 0) {
1002                         int firstfib = 1;
1003
1004                         printf("%s %s %s", cmd,
1005                             (nrflags & F_ISHOST) ? "host" : "net", dest);
1006                         if (*gateway)
1007                                 printf(": gateway %s", gateway);
1008
1009                         if (numfibs > 1) {
1010                                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1011                                         if (fl->fl_error == 0
1012                                             && fl->fl_num >= 0) {
1013                                                 if (firstfib) {
1014                                                         printf(" fib ");
1015                                                         firstfib = 0;
1016                                                 }
1017                                                 printf("%d", fl->fl_num);
1018                                                 if (fibnum-- > 1)
1019                                                         printf(",");
1020                                         }
1021                                 }
1022                         }
1023                         printf("\n");
1024                 }
1025
1026                 fibnum = 0;
1027                 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1028                         if (fl->fl_error != 0) {
1029                                 printf("%s %s %s", cmd, (nrflags & F_ISHOST)
1030                                     ? "host" : "net", dest);
1031                                 if (*gateway)
1032                                         printf(": gateway %s", gateway);
1033
1034                                 if (fl->fl_num >= 0)
1035                                         printf(" fib %d", fl->fl_num);
1036
1037                                 switch (fl->fl_errno) {
1038                                 case ESRCH:
1039                                         errmsg = "not in table";
1040                                         break;
1041                                 case EBUSY:
1042                                         errmsg = "entry in use";
1043                                         break;
1044                                 case ENOBUFS:
1045                                         errmsg = "not enough memory";
1046                                         break;
1047                                 case EADDRINUSE:
1048                                         /*
1049                                          * handle recursion avoidance
1050                                          * in rt_setgate()
1051                                          */
1052                                         errmsg = "gateway uses the same route";
1053                                         break;
1054                                 case EEXIST:
1055                                         errmsg = "route already in table";
1056                                         break;
1057                                 default:
1058                                         errmsg = strerror(fl->fl_errno);
1059                                         break;
1060                                 }
1061                                 printf(": %s\n", errmsg);
1062                                 error = 1;
1063                         }
1064                 }
1065         }
1066         exit(error);
1067 }
1068
1069 static int
1070 newroute_fib(int fib, char *cmd, int flags)
1071 {
1072         int error;
1073
1074         error = set_sofib(fib);
1075         if (error) {
1076                 warn("fib number %d is ignored", fib);
1077                 return (error);
1078         }
1079
1080         error = rtmsg(*cmd, flags, fib);
1081         return (error);
1082 }
1083
1084 #ifdef INET
1085 static void
1086 inet_makenetandmask(u_long net, struct sockaddr_in *sin,
1087     struct sockaddr_in *sin_mask, u_long bits)
1088 {
1089         u_long mask = 0;
1090
1091         rtm_addrs |= RTA_NETMASK;
1092
1093         /*
1094          * MSB of net should be meaningful. 0/0 is exception.
1095          */
1096         if (net > 0)
1097                 while ((net & 0xff000000) == 0)
1098                         net <<= 8;
1099
1100         /*
1101          * If no /xx was specified we must calculate the
1102          * CIDR address.
1103          */
1104         if ((bits == 0) && (net != 0)) {
1105                 u_long i, j;
1106
1107                 for(i = 0, j = 0xff; i < 4; i++)  {
1108                         if (net & j) {
1109                                 break;
1110                         }
1111                         j <<= 8;
1112                 }
1113                 /* i holds the first non zero bit */
1114                 bits = 32 - (i*8);
1115         }
1116         if (bits != 0)
1117                 mask = 0xffffffff << (32 - bits);
1118
1119         sin->sin_addr.s_addr = htonl(net);
1120         sin_mask->sin_addr.s_addr = htonl(mask);
1121         sin_mask->sin_len = sizeof(struct sockaddr_in);
1122         sin_mask->sin_family = AF_INET;
1123 }
1124 #endif
1125
1126 #ifdef INET6
1127 /*
1128  * XXX the function may need more improvement...
1129  */
1130 static int
1131 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
1132 {
1133         struct in6_addr in6;
1134
1135         if (plen == NULL) {
1136                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
1137                     sin6->sin6_scope_id == 0) {
1138                         plen = "0";
1139                 } else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
1140                         /* aggregatable global unicast - RFC2374 */
1141                         memset(&in6, 0, sizeof(in6));
1142                         if (!memcmp(&sin6->sin6_addr.s6_addr[8],
1143                                     &in6.s6_addr[8], 8))
1144                                 plen = "64";
1145                 }
1146         }
1147
1148         if (plen == NULL || strcmp(plen, "128") == 0)
1149                 return (1);
1150         rtm_addrs |= RTA_NETMASK;
1151         prefixlen(plen);
1152         return (0);
1153 }
1154 #endif
1155
1156 /*
1157  * Interpret an argument as a network address of some kind,
1158  * returning 1 if a host address, 0 if a network address.
1159  */
1160 static int
1161 getaddr(int idx, char *str, struct hostent **hpp, int nrflags)
1162 {
1163         struct sockaddr *sa;
1164 #if defined(INET)
1165         struct sockaddr_in *sin;
1166         struct hostent *hp;
1167         struct netent *np;
1168         u_long val;
1169         char *q;
1170 #elif defined(INET6)
1171         char *q;
1172 #endif
1173
1174         if (idx < 0 || idx >= RTAX_MAX)
1175                 usage("internal error");
1176         if (af == 0) {
1177 #if defined(INET)
1178                 af = AF_INET;
1179                 aflen = sizeof(struct sockaddr_in);
1180 #elif defined(INET6)
1181                 af = AF_INET6;
1182                 aflen = sizeof(struct sockaddr_in6);
1183 #else
1184                 af = AF_LINK;
1185                 aflen = sizeof(struct sockaddr_dl);
1186 #endif
1187         }
1188 #ifndef INET
1189         hpp = NULL;
1190 #endif
1191         rtm_addrs |= (1 << idx);
1192         sa = (struct sockaddr *)&so[idx];
1193         sa->sa_family = af;
1194         sa->sa_len = aflen;
1195
1196         switch (idx) {
1197         case RTAX_GATEWAY:
1198                 if (nrflags & F_INTERFACE) {
1199                         struct ifaddrs *ifap, *ifa;
1200                         struct sockaddr_dl *sdl0 = (struct sockaddr_dl *)(void *)sa;
1201                         struct sockaddr_dl *sdl = NULL;
1202
1203                         if (getifaddrs(&ifap))
1204                                 err(EX_OSERR, "getifaddrs");
1205
1206                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
1207                                 if (ifa->ifa_addr->sa_family != AF_LINK)
1208                                         continue;
1209
1210                                 if (strcmp(str, ifa->ifa_name) != 0)
1211                                         continue;
1212
1213                                 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
1214                         }
1215                         /* If we found it, then use it */
1216                         if (sdl != NULL) {
1217                                 /*
1218                                  * Note that we need to copy before calling
1219                                  * freeifaddrs().
1220                                  */
1221                                 memcpy(sdl0, sdl, sdl->sdl_len);
1222                         }
1223                         freeifaddrs(ifap);
1224                         if (sdl != NULL)
1225                                 return(1);
1226                 }
1227                 break;
1228         case RTAX_IFP:
1229                 sa->sa_family = AF_LINK;
1230                 break;
1231         }
1232         if (strcmp(str, "default") == 0) {
1233                 /*
1234                  * Default is net 0.0.0.0/0
1235                  */
1236                 switch (idx) {
1237                 case RTAX_DST:
1238                         nrflags |= F_FORCENET;
1239                         getaddr(RTAX_NETMASK, str, 0, nrflags);
1240                         break;
1241                 }
1242                 return (0);
1243         }
1244         switch (sa->sa_family) {
1245 #ifdef INET6
1246         case AF_INET6:
1247         {
1248                 struct addrinfo hints, *res;
1249                 int ecode;
1250
1251                 q = NULL;
1252                 if (idx == RTAX_DST && (q = strchr(str, '/')) != NULL)
1253                         *q = '\0';
1254                 memset(&hints, 0, sizeof(hints));
1255                 hints.ai_family = sa->sa_family;
1256                 hints.ai_socktype = SOCK_DGRAM;
1257                 ecode = getaddrinfo(str, NULL, &hints, &res);
1258                 if (ecode != 0 || res->ai_family != AF_INET6 ||
1259                     res->ai_addrlen != sizeof(struct sockaddr_in6))
1260                         errx(EX_OSERR, "%s: %s", str, gai_strerror(ecode));
1261                 memcpy(sa, res->ai_addr, res->ai_addrlen);
1262                 freeaddrinfo(res);
1263                 if (q != NULL)
1264                         *q++ = '/';
1265                 if (idx == RTAX_DST)
1266                         return (inet6_makenetandmask((struct sockaddr_in6 *)(void *)sa, q));
1267                 return (0);
1268         }
1269 #endif /* INET6 */
1270
1271         case AF_APPLETALK:
1272         {
1273                 struct sockaddr_at *sat = (struct sockaddr_at *)(void *)sa;
1274
1275                 if (!atalk_aton(str, &sat->sat_addr))
1276                         errx(EX_NOHOST, "bad address: %s", str);
1277                 rtm_addrs |= RTA_NETMASK;
1278                 return(nrflags & F_FORCEHOST || sat->sat_addr.s_node != 0);
1279         }
1280         case AF_LINK:
1281                 link_addr(str, (struct sockaddr_dl *)(void *)sa);
1282                 return (1);
1283
1284         case PF_ROUTE:
1285                 sockaddr(str, sa, sizeof(struct sockaddr_storage));
1286                 return (1);
1287 #ifdef INET
1288         case AF_INET:
1289 #endif
1290         default:
1291                 break;
1292         }
1293
1294 #ifdef INET
1295         sin = (struct sockaddr_in *)(void *)sa;
1296         if (hpp == NULL)
1297                 hpp = &hp;
1298         *hpp = NULL;
1299
1300         q = strchr(str,'/');
1301         if (q != NULL && idx == RTAX_DST) {
1302                 *q = '\0';
1303                 if ((val = inet_network(str)) != INADDR_NONE) {
1304                         inet_makenetandmask(val, sin,
1305                             (struct sockaddr_in *)&so[RTAX_NETMASK],
1306                             strtoul(q+1, 0, 0));
1307                         return (0);
1308                 }
1309                 *q = '/';
1310         }
1311         if ((idx != RTAX_DST || (nrflags & F_FORCENET) == 0) &&
1312             inet_aton(str, &sin->sin_addr)) {
1313                 val = sin->sin_addr.s_addr;
1314                 if (idx != RTAX_DST || nrflags & F_FORCEHOST ||
1315                     inet_lnaof(sin->sin_addr) != INADDR_ANY)
1316                         return (1);
1317                 else {
1318                         val = ntohl(val);
1319                         goto netdone;
1320                 }
1321         }
1322         if (idx == RTAX_DST && (nrflags & F_FORCEHOST) == 0 &&
1323             ((val = inet_network(str)) != INADDR_NONE ||
1324             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1325 netdone:
1326                 inet_makenetandmask(val, sin,
1327                     (struct sockaddr_in *)&so[RTAX_NETMASK], 0);
1328                 return (0);
1329         }
1330         hp = gethostbyname(str);
1331         if (hp != NULL) {
1332                 *hpp = hp;
1333                 sin->sin_family = hp->h_addrtype;
1334                 memmove((char *)&sin->sin_addr, hp->h_addr,
1335                     MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
1336                 return (1);
1337         }
1338 #endif
1339         errx(EX_NOHOST, "bad address: %s", str);
1340 }
1341
1342 static int
1343 prefixlen(const char *str)
1344 {
1345         int len = atoi(str), q, r;
1346         int max;
1347         char *p;
1348
1349         rtm_addrs |= RTA_NETMASK;
1350         switch (af) {
1351 #ifdef INET6
1352         case AF_INET6:
1353         {
1354                 struct sockaddr_in6 *sin6 =
1355                     (struct sockaddr_in6 *)&so[RTAX_NETMASK];
1356
1357                 max = 128;
1358                 p = (char *)&sin6->sin6_addr;
1359                 sin6->sin6_family = AF_INET6;
1360                 sin6->sin6_len = sizeof(*sin6);
1361                 break;
1362         }
1363 #endif
1364 #ifdef INET
1365         case AF_INET:
1366         {
1367                 struct sockaddr_in *sin =
1368                     (struct sockaddr_in *)&so[RTAX_NETMASK];
1369
1370                 max = 32;
1371                 p = (char *)&sin->sin_addr;
1372                 sin->sin_family = AF_INET;
1373                 sin->sin_len = sizeof(*sin);
1374                 break;
1375         }
1376 #endif
1377         default:
1378                 errx(EX_OSERR, "prefixlen not supported in this af");
1379         }
1380
1381         if (len < 0 || max < len)
1382                 errx(EX_USAGE, "%s: invalid prefixlen", str);
1383
1384         q = len >> 3;
1385         r = len & 7;
1386         memset((void *)p, 0, max / 8);
1387         if (q > 0)
1388                 memset((void *)p, 0xff, q);
1389         if (r > 0)
1390                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1391         if (len == max)
1392                 return (-1);
1393         else
1394                 return (len);
1395 }
1396
1397 static void
1398 interfaces(void)
1399 {
1400         size_t needed;
1401         int mib[6];
1402         char *buf, *lim, *next, count = 0;
1403         struct rt_msghdr *rtm;
1404
1405 retry2:
1406         mib[0] = CTL_NET;
1407         mib[1] = PF_ROUTE;
1408         mib[2] = 0;             /* protocol */
1409         mib[3] = AF_UNSPEC;
1410         mib[4] = NET_RT_IFLIST;
1411         mib[5] = 0;             /* no flags */
1412         if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
1413                 err(EX_OSERR, "route-sysctl-estimate");
1414         if ((buf = malloc(needed)) == NULL)
1415                 errx(EX_OSERR, "malloc failed");
1416         if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
1417                 if (errno == ENOMEM && count++ < 10) {
1418                         warnx("Routing table grew, retrying");
1419                         sleep(1);
1420                         free(buf);
1421                         goto retry2;
1422                 }
1423                 err(EX_OSERR, "actual retrieval of interface table");
1424         }
1425         lim = buf + needed;
1426         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1427                 rtm = (struct rt_msghdr *)(void *)next;
1428                 print_rtmsg(rtm, rtm->rtm_msglen);
1429         }
1430 }
1431
1432 static void
1433 monitor(int argc, char *argv[])
1434 {
1435         int n, fib, error;
1436         char msg[2048], *endptr;
1437
1438         fib = defaultfib;
1439         while (argc > 1) {
1440                 argc--;
1441                 argv++;
1442                 if (**argv != '-')
1443                         usage(*argv);
1444                 switch (keyword(*argv + 1)) {
1445                 case K_FIB:
1446                         if (!--argc)
1447                                 usage(*argv);
1448                         errno = 0;
1449                         fib = strtol(*++argv, &endptr, 0);
1450                         if (errno == 0) {
1451                                 if (*endptr != '\0' ||
1452                                     fib < 0 ||
1453                                     (numfibs != -1 && fib > numfibs - 1))
1454                                         errno = EINVAL;
1455                         }
1456                         if (errno)
1457                                 errx(EX_USAGE, "invalid fib number: %s", *argv);
1458                         break;
1459                 default:
1460                         usage(*argv);
1461                 }
1462         }
1463         error = set_sofib(fib);
1464         if (error)
1465                 errx(EX_USAGE, "invalid fib number: %d", fib);
1466
1467         verbose = 1;
1468         if (debugonly) {
1469                 interfaces();
1470                 exit(0);
1471         }
1472         for (;;) {
1473                 time_t now;
1474                 n = read(s, msg, 2048);
1475                 now = time(NULL);
1476                 (void)printf("\ngot message of size %d on %s", n, ctime(&now));
1477                 print_rtmsg((struct rt_msghdr *)(void *)msg, n);
1478         }
1479 }
1480
1481 static struct {
1482         struct  rt_msghdr m_rtm;
1483         char    m_space[512];
1484 } m_rtmsg;
1485
1486 static int
1487 rtmsg(int cmd, int flags, int fib)
1488 {
1489         static int seq;
1490         int rlen;
1491         char *cp = m_rtmsg.m_space;
1492         int l;
1493
1494 #define NEXTADDR(w, u)                                                  \
1495         if (rtm_addrs & (w)) {                                          \
1496                 l = (((struct sockaddr *)&(u))->sa_len == 0) ?          \
1497                     sizeof(long) :                                      \
1498                     1 + ((((struct sockaddr *)&(u))->sa_len - 1)        \
1499                         | (sizeof(long) - 1));                          \
1500                 memmove(cp, (char *)&(u), l);                           \
1501                 cp += l;                                                \
1502                 if (verbose)                                            \
1503                         sodump((struct sockaddr *)&(u), #w);            \
1504         }
1505
1506         errno = 0;
1507         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1508         if (cmd == 'a')
1509                 cmd = RTM_ADD;
1510         else if (cmd == 'c')
1511                 cmd = RTM_CHANGE;
1512         else if (cmd == 'g' || cmd == 's') {
1513                 cmd = RTM_GET;
1514                 if (so[RTAX_IFP].ss_family == 0) {
1515                         so[RTAX_IFP].ss_family = AF_LINK;
1516                         so[RTAX_IFP].ss_len = sizeof(struct sockaddr_dl);
1517                         rtm_addrs |= RTA_IFP;
1518                 }
1519         } else
1520                 cmd = RTM_DELETE;
1521 #define rtm m_rtmsg.m_rtm
1522         rtm.rtm_type = cmd;
1523         rtm.rtm_flags = flags;
1524         rtm.rtm_version = RTM_VERSION;
1525         rtm.rtm_seq = ++seq;
1526         rtm.rtm_addrs = rtm_addrs;
1527         rtm.rtm_rmx = rt_metrics;
1528         rtm.rtm_inits = rtm_inits;
1529
1530         NEXTADDR(RTA_DST, so[RTAX_DST]);
1531         NEXTADDR(RTA_GATEWAY, so[RTAX_GATEWAY]);
1532         NEXTADDR(RTA_NETMASK, so[RTAX_NETMASK]);
1533         NEXTADDR(RTA_GENMASK, so[RTAX_GENMASK]);
1534         NEXTADDR(RTA_IFP, so[RTAX_IFP]);
1535         NEXTADDR(RTA_IFA, so[RTAX_IFA]);
1536         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1537         if (verbose)
1538                 print_rtmsg(&rtm, l);
1539         if (debugonly)
1540                 return (0);
1541         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1542                 if (errno == EPERM)
1543                         err(1, "writing to routing socket");
1544                 warn("writing to routing socket");
1545                 return (-1);
1546         }
1547         if (cmd == RTM_GET) {
1548                 do {
1549                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1550                 } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
1551                 if (l < 0)
1552                         warn("read from routing socket");
1553                 else
1554                         print_getmsg(&rtm, l, fib);
1555         }
1556 #undef rtm
1557         return (0);
1558 }
1559
1560 static const char *msgtypes[] = {
1561         "",
1562         "RTM_ADD: Add Route",
1563         "RTM_DELETE: Delete Route",
1564         "RTM_CHANGE: Change Metrics or flags",
1565         "RTM_GET: Report Metrics",
1566         "RTM_LOSING: Kernel Suspects Partitioning",
1567         "RTM_REDIRECT: Told to use different route",
1568         "RTM_MISS: Lookup failed on this address",
1569         "RTM_LOCK: fix specified metrics",
1570         "RTM_OLDADD: caused by SIOCADDRT",
1571         "RTM_OLDDEL: caused by SIOCDELRT",
1572         "RTM_RESOLVE: Route created by cloning",
1573         "RTM_NEWADDR: address being added to iface",
1574         "RTM_DELADDR: address being removed from iface",
1575         "RTM_IFINFO: iface status change",
1576         "RTM_NEWMADDR: new multicast group membership on iface",
1577         "RTM_DELMADDR: multicast group membership removed from iface",
1578         "RTM_IFANNOUNCE: interface arrival/departure",
1579         "RTM_IEEE80211: IEEE 802.11 wireless event",
1580 };
1581
1582 static const char metricnames[] =
1583     "\011weight\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire"
1584     "\1mtu";
1585 static const char routeflags[] =
1586     "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE"
1587     "\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE"
1588     "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3"
1589     "\025PINNED\026LOCAL\027BROADCAST\030MULTICAST\035STICKY";
1590 static const char ifnetflags[] =
1591     "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1592     "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1593     "\017LINK2\020MULTICAST";
1594 static const char addrnames[] =
1595     "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD";
1596
1597 static const char errfmt[] =
1598     "\n%s: truncated route message, only %zu bytes left\n";
1599
1600 static void
1601 print_rtmsg(struct rt_msghdr *rtm, size_t msglen)
1602 {
1603         struct if_msghdr *ifm;
1604         struct ifa_msghdr *ifam;
1605 #ifdef RTM_NEWMADDR
1606         struct ifma_msghdr *ifmam;
1607 #endif
1608         struct if_announcemsghdr *ifan;
1609         const char *state;
1610
1611         if (verbose == 0)
1612                 return;
1613         if (rtm->rtm_version != RTM_VERSION) {
1614                 (void)printf("routing message version %d not understood\n",
1615                     rtm->rtm_version);
1616                 return;
1617         }
1618         if (rtm->rtm_type < nitems(msgtypes))
1619                 (void)printf("%s: ", msgtypes[rtm->rtm_type]);
1620         else
1621                 (void)printf("unknown type %d: ", rtm->rtm_type);
1622         (void)printf("len %d, ", rtm->rtm_msglen);
1623
1624 #define REQUIRE(x)      do {            \
1625         if (msglen < sizeof(x))         \
1626                 goto badlen;            \
1627         else                            \
1628                 msglen -= sizeof(x);    \
1629         } while (0)
1630
1631         switch (rtm->rtm_type) {
1632         case RTM_IFINFO:
1633                 REQUIRE(struct if_msghdr);
1634                 ifm = (struct if_msghdr *)rtm;
1635                 (void)printf("if# %d, ", ifm->ifm_index);
1636                 switch (ifm->ifm_data.ifi_link_state) {
1637                 case LINK_STATE_DOWN:
1638                         state = "down";
1639                         break;
1640                 case LINK_STATE_UP:
1641                         state = "up";
1642                         break;
1643                 default:
1644                         state = "unknown";
1645                         break;
1646                 }
1647                 (void)printf("link: %s, flags:", state);
1648                 printb(ifm->ifm_flags, ifnetflags);
1649                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs, msglen);
1650                 break;
1651         case RTM_NEWADDR:
1652         case RTM_DELADDR:
1653                 REQUIRE(struct ifa_msghdr);
1654                 ifam = (struct ifa_msghdr *)rtm;
1655                 (void)printf("metric %d, flags:", ifam->ifam_metric);
1656                 printb(ifam->ifam_flags, routeflags);
1657                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs, msglen);
1658                 break;
1659 #ifdef RTM_NEWMADDR
1660         case RTM_NEWMADDR:
1661         case RTM_DELMADDR:
1662                 REQUIRE(struct ifma_msghdr);
1663                 ifmam = (struct ifma_msghdr *)rtm;
1664                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs, msglen);
1665                 break;
1666 #endif
1667         case RTM_IFANNOUNCE:
1668                 REQUIRE(struct if_announcemsghdr);
1669                 ifan = (struct if_announcemsghdr *)rtm;
1670                 (void)printf("if# %d, what: ", ifan->ifan_index);
1671                 switch (ifan->ifan_what) {
1672                 case IFAN_ARRIVAL:
1673                         (void)printf("arrival");
1674                         break;
1675                 case IFAN_DEPARTURE:
1676                         printf("departure");
1677                         break;
1678                 default:
1679                         printf("#%d", ifan->ifan_what);
1680                         break;
1681                 }
1682                 printf("\n");
1683                 fflush(stdout);
1684                 break;
1685
1686         default:
1687                 printf("pid: %ld, seq %d, errno %d, flags:",
1688                         (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1689                 printb(rtm->rtm_flags, routeflags);
1690                 pmsg_common(rtm, msglen);
1691         }
1692
1693         return;
1694
1695 badlen:
1696         (void)printf(errfmt, __func__, msglen);
1697 #undef  REQUIRE
1698 }
1699
1700 static void
1701 print_getmsg(struct rt_msghdr *rtm, int msglen, int fib)
1702 {
1703         struct sockaddr *sp[RTAX_MAX];
1704         char *cp;
1705         int i;
1706
1707         memset(sp, 0, sizeof(sp));
1708         (void)printf("   route to: %s\n",
1709             routename((struct sockaddr *)&so[RTAX_DST]));
1710         if (rtm->rtm_version != RTM_VERSION) {
1711                 warnx("routing message version %d not understood",
1712                      rtm->rtm_version);
1713                 return;
1714         }
1715         if (rtm->rtm_msglen > msglen) {
1716                 warnx("message length mismatch, in packet %d, returned %d",
1717                       rtm->rtm_msglen, msglen);
1718                 return;
1719         }
1720         if (rtm->rtm_errno)  {
1721                 errno = rtm->rtm_errno;
1722                 warn("message indicates error %d", errno);
1723                 return;
1724         }
1725         cp = ((char *)(rtm + 1));
1726         for (i = 0; i < RTAX_MAX; i++)
1727                 if (rtm->rtm_addrs & (1 << i)) {
1728                         sp[i] = (struct sockaddr *)cp;
1729                         cp += SA_SIZE((struct sockaddr *)cp);
1730                 }
1731         if ((rtm->rtm_addrs & RTA_IFP) &&
1732             (sp[RTAX_IFP]->sa_family != AF_LINK ||
1733              ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen == 0))
1734                         sp[RTAX_IFP] = NULL;
1735         if (sp[RTAX_DST] && sp[RTAX_NETMASK])
1736                 sp[RTAX_NETMASK]->sa_family = sp[RTAX_DST]->sa_family; /* XXX */
1737         if (sp[RTAX_DST])
1738                 (void)printf("destination: %s\n", routename(sp[RTAX_DST]));
1739         if (sp[RTAX_NETMASK])
1740                 (void)printf("       mask: %s\n", routename(sp[RTAX_NETMASK]));
1741         if (sp[RTAX_GATEWAY] && (rtm->rtm_flags & RTF_GATEWAY))
1742                 (void)printf("    gateway: %s\n", routename(sp[RTAX_GATEWAY]));
1743         if (fib >= 0)
1744                 (void)printf("        fib: %u\n", (unsigned int)fib);
1745         if (sp[RTAX_IFP])
1746                 (void)printf("  interface: %.*s\n",
1747                     ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen,
1748                     ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_data);
1749         (void)printf("      flags: ");
1750         printb(rtm->rtm_flags, routeflags);
1751
1752 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1753 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1754         printf("\n%9s %9s %9s %9s %9s %10s %9s\n", "recvpipe",
1755             "sendpipe", "ssthresh", "rtt,msec", "mtu   ", "weight", "expire");
1756         printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1757         printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1758         printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1759         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1760         printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1761         printf("%8ld%c ", rtm->rtm_rmx.rmx_weight, lock(WEIGHT));
1762         if (rtm->rtm_rmx.rmx_expire)
1763                 rtm->rtm_rmx.rmx_expire -= time(0);
1764         printf("%8ld%c\n", rtm->rtm_rmx.rmx_expire, lock(EXPIRE));
1765 #undef lock
1766 #undef msec
1767 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1768         if (verbose)
1769                 pmsg_common(rtm, msglen);
1770         else if (rtm->rtm_addrs &~ RTA_IGN) {
1771                 (void)printf("sockaddrs: ");
1772                 printb(rtm->rtm_addrs, addrnames);
1773                 putchar('\n');
1774         }
1775 #undef  RTA_IGN
1776 }
1777
1778 static void
1779 pmsg_common(struct rt_msghdr *rtm, size_t msglen)
1780 {
1781
1782         (void)printf("\nlocks: ");
1783         printb(rtm->rtm_rmx.rmx_locks, metricnames);
1784         (void)printf(" inits: ");
1785         printb(rtm->rtm_inits, metricnames);
1786         if (msglen > sizeof(struct rt_msghdr))
1787                 pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs,
1788                     msglen - sizeof(struct rt_msghdr));
1789         else
1790                 (void)fflush(stdout);
1791 }
1792
1793 static void
1794 pmsg_addrs(char *cp, int addrs, size_t len)
1795 {
1796         struct sockaddr *sa;
1797         int i;
1798
1799         if (addrs == 0) {
1800                 (void)putchar('\n');
1801                 return;
1802         }
1803         (void)printf("\nsockaddrs: ");
1804         printb(addrs, addrnames);
1805         putchar('\n');
1806         for (i = 0; i < RTAX_MAX; i++)
1807                 if (addrs & (1 << i)) {
1808                         sa = (struct sockaddr *)cp;
1809                         if (len == 0 || len < SA_SIZE(sa)) {
1810                                 (void)printf(errfmt, __func__, len);
1811                                 break;
1812                         }
1813                         (void)printf(" %s", routename(sa));
1814                         len -= SA_SIZE(sa);
1815                         cp += SA_SIZE(sa);
1816                 }
1817         (void)putchar('\n');
1818         (void)fflush(stdout);
1819 }
1820
1821 static void
1822 printb(int b, const char *str)
1823 {
1824         int i;
1825         int gotsome = 0;
1826
1827         if (b == 0)
1828                 return;
1829         while ((i = *str++) != 0) {
1830                 if (b & (1 << (i-1))) {
1831                         if (gotsome == 0)
1832                                 i = '<';
1833                         else
1834                                 i = ',';
1835                         putchar(i);
1836                         gotsome = 1;
1837                         for (; (i = *str) > 32; str++)
1838                                 putchar(i);
1839                 } else
1840                         while (*str > 32)
1841                                 str++;
1842         }
1843         if (gotsome)
1844                 putchar('>');
1845 }
1846
1847 int
1848 keyword(const char *cp)
1849 {
1850         struct keytab *kt = keywords;
1851
1852         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1853                 kt++;
1854         return (kt->kt_i);
1855 }
1856
1857 static void
1858 sodump(struct sockaddr *sa, const char *which)
1859 {
1860 #ifdef INET6
1861         char nbuf[INET6_ADDRSTRLEN];
1862 #endif
1863
1864         switch (sa->sa_family) {
1865         case AF_LINK:
1866                 (void)printf("%s: link %s; ", which,
1867                     link_ntoa((struct sockaddr_dl *)(void *)sa));
1868                 break;
1869 #ifdef INET
1870         case AF_INET:
1871                 (void)printf("%s: inet %s; ", which,
1872                     inet_ntoa(((struct sockaddr_in *)(void *)sa)->sin_addr));
1873                 break;
1874 #endif
1875 #ifdef INET6
1876         case AF_INET6:
1877                 (void)printf("%s: inet6 %s; ", which, inet_ntop(sa->sa_family,
1878                     &((struct sockaddr_in6 *)(void *)sa)->sin6_addr, nbuf,
1879                     sizeof(nbuf)));
1880                 break;
1881 #endif
1882         case AF_APPLETALK:
1883                 (void)printf("%s: atalk %s; ", which,
1884                     atalk_ntoa(((struct sockaddr_at *)(void *)sa)->sat_addr));
1885                 break;
1886         }
1887         (void)fflush(stdout);
1888 }
1889
1890 /* States*/
1891 #define VIRGIN  0
1892 #define GOTONE  1
1893 #define GOTTWO  2
1894 /* Inputs */
1895 #define DIGIT   (4*0)
1896 #define END     (4*1)
1897 #define DELIM   (4*2)
1898
1899 static void
1900 sockaddr(char *addr, struct sockaddr *sa, size_t size)
1901 {
1902         char *cp = (char *)sa;
1903         char *cplim = cp + size;
1904         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1905
1906         memset(cp, 0, size);
1907         cp++;
1908         do {
1909                 if ((*addr >= '0') && (*addr <= '9')) {
1910                         new = *addr - '0';
1911                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1912                         new = *addr - 'a' + 10;
1913                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1914                         new = *addr - 'A' + 10;
1915                 } else if (*addr == '\0')
1916                         state |= END;
1917                 else
1918                         state |= DELIM;
1919                 addr++;
1920                 switch (state /* | INPUT */) {
1921                 case GOTTWO | DIGIT:
1922                         *cp++ = byte; /*FALLTHROUGH*/
1923                 case VIRGIN | DIGIT:
1924                         state = GOTONE; byte = new; continue;
1925                 case GOTONE | DIGIT:
1926                         state = GOTTWO; byte = new + (byte << 4); continue;
1927                 default: /* | DELIM */
1928                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1929                 case GOTONE | END:
1930                 case GOTTWO | END:
1931                         *cp++ = byte; /* FALLTHROUGH */
1932                 case VIRGIN | END:
1933                         break;
1934                 }
1935                 break;
1936         } while (cp < cplim);
1937         sa->sa_len = cp - (char *)sa;
1938 }
1939
1940 static int
1941 atalk_aton(const char *text, struct at_addr *addr)
1942 {
1943         u_int net, node;
1944
1945         if (sscanf(text, "%u.%u", &net, &node) != 2
1946             || net > 0xffff || node > 0xff)
1947                 return(0);
1948         addr->s_net = htons(net);
1949         addr->s_node = node;
1950         return(1);
1951 }
1952
1953 static char *
1954 atalk_ntoa(struct at_addr at)
1955 {
1956         static char buf[20];
1957
1958         (void)snprintf(buf, sizeof(buf), "%u.%u", ntohs(at.s_net), at.s_node);
1959         buf[sizeof(buf) - 1] = '\0';
1960         return(buf);
1961 }