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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1989, 1991, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)route.c  8.6 (Berkeley) 4/28/95
  35  * $FreeBSD: src/sbin/route/route.c,v 1.40.2.11 2003/02/27 23:10:10 ru Exp $
  36  * $DragonFly: src/sbin/route/route.c,v 1.17 2008/07/07 22:02:09 nant Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/file.h>
  41 #include <sys/socket.h>
  42 #include <sys/ioctl.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/types.h>
  45
  46 #include <net/if.h>
  47 #include <net/route.h>
  48 #include <net/if_dl.h>
  49 #include <netinet/in.h>
  50 #include <netinet/if_ether.h>
  51 #include <netatalk/at.h>
  52 #ifdef NS
  53 #include <netns/ns.h>
  54 #endif
  55 #include <arpa/inet.h>
  56 #include <netdb.h>
  57
  58 #include <netproto/mpls/mpls.h>
  59
  60 #include <ctype.h>
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <paths.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <sysexits.h>
  68 #include <unistd.h>
  69 #include <ifaddrs.h>
  70
  71 #include "extern.h"
  72 #include "keywords.h"
  73
  74 union   sockunion {
  75         struct  sockaddr sa;
  76         struct  sockaddr_in sin;
  77 #ifdef INET6
  78         struct  sockaddr_in6 sin6;
  79 #endif
  80         struct  sockaddr_at sat;
  81 #ifdef NS
  82         struct  sockaddr_ns sns;
  83 #endif
  84         struct  sockaddr_mpls smpls;
  85         struct  sockaddr_dl sdl;
  86         struct  sockaddr_inarp sinarp;
  87         struct  sockaddr_storage ss; /* added to avoid memory overrun */
  88 } so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp, so_mpls1,
  89         so_mpls2, so_mpls3;
  90
  91 typedef union sockunion *sup;
  92
  93 int     nflag, wflag;
  94 int     cpuflag = -1;
  95
  96 static struct ortentry route;
  97 static struct rt_metrics rt_metrics;
  98 static int      pid, rtm_addrs;
  99 static int      s;
 100 static int      forcehost, forcenet, af, qflag, tflag;
 101 static int      iflag, verbose, aflen = sizeof(struct sockaddr_in);
 102 static int      locking, lockrest, debugonly;
 103 static int      mplsop, popcount, pushcount, swapcount;
 104 static u_long   rtm_inits;
 105 static uid_t    uid;
 106 #ifdef NS
 107 static short    ns_bh[] = {-1,-1,-1};
 108 #endif
 109
 110 static int       atalk_aton(const char *, struct at_addr *);
 111 static char     *atalk_ntoa(struct at_addr);
 112 static void      flushroutes(int, char **);
 113 static void      set_metric(char *, int);
 114 static void      newroute(int, char **);
 115 static void      inet_makenetandmask(u_long, struct sockaddr_in *, u_long);
 116 static void      interfaces(void);
 117 static void      monitor(void);
 118 static void      sockaddr(char *, struct sockaddr *);
 119 static void      sodump(sup, const char *);
 120 static void      bprintf(FILE *, int, u_char *);
 121 static void      print_getmsg(struct rt_msghdr *, int);
 122 static void      print_rtmsg(struct rt_msghdr *, int);
 123 static void      pmsg_common(struct rt_msghdr *);
 124 static void      pmsg_addrs(char *, int);
 125 static void      mask_addr(void);
 126 static int       getaddr(int, char *, struct hostent **);
 127 static int       rtmsg(int, int);
 128 static int       prefixlen(const char *);
 129 #ifdef INET6
 130 static int       inet6_makenetandmask(struct sockaddr_in6 *, const char *);
 131 #endif
 132
 133 void
 134 usage(const char *cp)
 135 {
 136         if (cp != NULL)
 137                 warnx("bad keyword: %s", cp);
 138         fprintf(stderr, "usage: route [-dnqtv] command [[modifiers] args]\n");
 139         exit(EX_USAGE);
 140         /* NOTREACHED */
 141 }
 142
 143 #define ROUNDUP(a) \
 144         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
 145 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
 146
 147 int
 148 main(int argc, char **argv)
 149 {
 150         int ch;
 151
 152         if (argc < 2)
 153                 usage((char *)NULL);
 154
 155         while ((ch = getopt(argc, argv, "c:wnqdtv")) != -1)
 156                 switch(ch) {
 157                 case 'c':
 158                         cpuflag = strtol(optarg, NULL, 0);
 159                         break;
 160                 case 'w':
 161                         wflag = 1;
 162                         break;
 163                 case 'n':
 164                         nflag = 1;
 165                         break;
 166                 case 'q':
 167                         qflag = 1;
 168                         break;
 169                 case 'v':
 170                         verbose = 1;
 171                         break;
 172                 case 't':
 173                         tflag = 1;
 174                         break;
 175                 case 'd':
 176                         debugonly = 1;
 177                         break;
 178                 case '?':
 179                 default:
 180                         usage((char *)NULL);
 181                 }
 182         argc -= optind;
 183         argv += optind;
 184
 185         pid = getpid();
 186         uid = geteuid();
 187         if (tflag)
 188                 s = open(_PATH_DEVNULL, O_WRONLY, 0);
 189         else
 190                 s = socket(PF_ROUTE, SOCK_RAW, 0);
 191         if (s < 0)
 192                 err(EX_OSERR, "socket");
 193         if (*argv != NULL)
 194                 switch (keyword(*argv)) {
 195                 case K_GET:
 196                         uid = 0;
 197                         /* FALLTHROUGH */
 198
 199                 case K_CHANGE:
 200                 case K_ADD:
 201                 case K_DELETE:
 202                         newroute(argc, argv);
 203                         /* NOTREACHED */
 204
 205                 case K_SHOW:
 206                         show(argc, argv);
 207                         return(0);
 208
 209                 case K_MONITOR:
 210                         monitor();
 211                         /* NOTREACHED */
 212
 213                 case K_FLUSH:
 214                         flushroutes(argc, argv);
 215                         exit(0);
 216                         /* NOTREACHED */
 217                 }
 218         usage(*argv);
 219         /* NOTREACHED */
 220 }
 221
 222 /*
 223  * Purge all entries in the routing tables not
 224  * associated with network interfaces.
 225  */
 226 static void
 227 flushroutes(int argc, char **argv)
 228 {
 229         size_t needed;
 230         int mib[7], rlen, seqno;
 231         int miblen;
 232         char *buf, *next, *lim;
 233         struct rt_msghdr *rtm;
 234
 235         if (uid != 0) {
 236                 errx(EX_NOPERM, "must be root to alter routing table");
 237         }
 238         shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 239         if (argc > 1) {
 240                 argv++;
 241                 if (argc == 2 && **argv == '-')
 242                     switch (keyword(*argv + 1)) {
 243                         case K_INET:
 244                                 af = AF_INET;
 245                                 break;
 246 #ifdef INET6
 247                         case K_INET6:
 248                                 af = AF_INET6;
 249                                 break;
 250 #endif
 251                         case K_ATALK:
 252                                 af = AF_APPLETALK;
 253                                 break;
 254 #ifdef NS
 255                         case K_XNS:
 256                                 af = AF_NS;
 257                                 break;
 258 #endif
 259                         case K_LINK:
 260                                 af = AF_LINK;
 261                                 break;
 262                         case K_MPLS:
 263                                 af = AF_MPLS;
 264                                 break;
 265                         default:
 266                                 goto bad;
 267                 } else
 268 bad:                    usage(*argv);
 269         }
 270         mib[0] = CTL_NET;
 271         mib[1] = PF_ROUTE;
 272         mib[2] = 0;             /* protocol */
 273         mib[3] = 0;             /* wildcard address family */
 274         mib[4] = NET_RT_DUMP;
 275         mib[5] = 0;             /* no flags */
 276         if (cpuflag >= 0) {
 277                 mib[6] = cpuflag;
 278                 miblen = 7;
 279         } else {
 280                 miblen = 6;
 281         }
 282         if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)
 283                 err(EX_OSERR, "route-sysctl-estimate");
 284         if ((buf = malloc(needed)) == NULL)
 285                 errx(EX_OSERR, "malloc failed");
 286         if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0)
 287                 err(EX_OSERR, "route-sysctl-get");
 288         lim = buf + needed;
 289         if (verbose)
 290                 printf("Examining routing table from sysctl\n");
 291         seqno = 0;              /* ??? */
 292         for (next = buf; next < lim; next += rtm->rtm_msglen) {
 293                 rtm = (struct rt_msghdr *)next;
 294                 if (verbose)
 295                         print_rtmsg(rtm, rtm->rtm_msglen);
 296                 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
 297                         continue;
 298                 if (af != 0) {
 299                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 300
 301                         if (sa->sa_family != af)
 302                                 continue;
 303                 }
 304                 if (debugonly)
 305                         continue;
 306                 rtm->rtm_type = RTM_DELETE;
 307                 rtm->rtm_seq = seqno;
 308                 rlen = write(s, next, rtm->rtm_msglen);
 309                 if (rlen < (int)rtm->rtm_msglen) {
 310                         warn("write to routing socket");
 311                         printf("got only %d for rlen\n", rlen);
 312                         break;
 313                 }
 314                 seqno++;
 315                 if (qflag)
 316                         continue;
 317                 if (verbose) {
 318                         print_rtmsg(rtm, rlen);
 319                 } else {
 320                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 321                         if (wflag) {
 322                             printf("%-20s ", rtm->rtm_flags & RTF_HOST ?
 323                                 routename(sa) : netname(sa));
 324                         } else {
 325                             printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
 326                                 routename(sa) : netname(sa));
 327                         }
 328                         sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) +
 329                             (char *)sa);
 330                         if (wflag) {
 331                             printf("%-20s ", routename(sa));
 332                         } else {
 333                             printf("%-20.20s ", routename(sa));
 334                         }
 335                         printf("done\n");
 336                 }
 337         }
 338 }
 339
 340 char *
 341 routename(struct sockaddr *sa)
 342 {
 343         const char *cp;
 344         static char line[MAXHOSTNAMELEN + 1];
 345         struct hostent *hp;
 346         static char domain[MAXHOSTNAMELEN + 1];
 347         static int first = 1;
 348
 349         if (first) {
 350                 first = 0;
 351                 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
 352                     (cp = strchr(domain, '.'))) {
 353                         domain[MAXHOSTNAMELEN] = '\0';
 354                         strcpy(domain, cp + 1);
 355                 } else
 356                         domain[0] = 0;
 357         }
 358
 359         if (sa->sa_len == 0)
 360                 strcpy(line, "default");
 361         else switch (sa->sa_family) {
 362
 363         case AF_INET:
 364             {   struct in_addr in;
 365                 in = ((struct sockaddr_in *)sa)->sin_addr;
 366
 367                 cp = NULL;
 368                 if (in.s_addr == INADDR_ANY || sa->sa_len < 4)
 369                         cp = "default";
 370                 if (cp == NULL && !nflag) {
 371                         hp = gethostbyaddr(&in, sizeof(struct in_addr),
 372                                 AF_INET);
 373                         if (hp != NULL) {
 374                                 char *cptr;
 375                                 cptr = strchr(hp->h_name, '.');
 376                                 if (cptr != NULL && !wflag &&
 377                                     strcmp(cptr + 1, domain) == 0)
 378                                         *cptr = '\0';
 379                                 cp = hp->h_name;
 380                         }
 381                 }
 382                 if (cp != NULL) {
 383                         strncpy(line, cp, sizeof(line) - 1);
 384                         line[sizeof(line) - 1] = '\0';
 385                 } else
 386                         sprintf(line, "%s", inet_ntoa(in));
 387                 break;
 388             }
 389
 390 #ifdef INET6
 391         case AF_INET6:
 392         {
 393                 struct sockaddr_in6 sin6; /* use static var for safety */
 394                 int niflags = 0;
 395 #ifdef NI_WITHSCOPEID
 396                 niflags = NI_WITHSCOPEID;
 397 #endif
 398
 399                 memset(&sin6, 0, sizeof(sin6));
 400                 memcpy(&sin6, sa, sa->sa_len);
 401                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 402                 sin6.sin6_family = AF_INET6;
 403 #ifdef __KAME__
 404                 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
 405                     (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 406                      IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
 407                     sin6.sin6_scope_id == 0) {
 408                         sin6.sin6_scope_id =
 409                             ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 410                         sin6.sin6_addr.s6_addr[2] = 0;
 411                         sin6.sin6_addr.s6_addr[3] = 0;
 412                 }
 413 #endif
 414                 if (nflag)
 415                         niflags |= NI_NUMERICHOST;
 416                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 417                     line, sizeof(line), NULL, 0, niflags) != 0)
 418                         strncpy(line, "invalid", sizeof(line));
 419
 420                 return(line);
 421         }
 422 #endif
 423
 424         case AF_APPLETALK:
 425                 snprintf(line, sizeof(line), "atalk %s",
 426                         atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr));
 427                 break;
 428
 429 #ifdef NS
 430         case AF_NS:
 431                 return(ns_print((struct sockaddr_ns *)sa));
 432 #endif
 433
 434         case AF_LINK:
 435                 return(link_ntoa((struct sockaddr_dl *)sa));
 436
 437         default:
 438             {
 439                 /*
 440                  * Unknown address family; just render the raw
 441                  * data in sa->sa_data as hex values.
 442                  */
 443                 uint8_t *sp = (uint8_t *)sa->sa_data;
 444                 uint8_t *splim = (uint8_t *)sa + sa->sa_len;
 445                 char *cps = line + sprintf(line, "(%d)", sa->sa_family);
 446                 char *cpe = line + sizeof(line);
 447
 448                 while (sp < splim && cps < cpe)
 449                         cps += snprintf(cps, cpe - cps, " %02x", *sp++);
 450                 break;
 451             }
 452         }
 453         return(line);
 454 }
 455
 456 /*
 457  * Return the name of the network whose address is given.
 458  * The address is assumed to be that of a net or subnet, not a host.
 459  */
 460 char *
 461 netname(struct sockaddr *sa)
 462 {
 463         const char *cp = 0;
 464         static char line[MAXHOSTNAMELEN + 1];
 465         struct netent *np = 0;
 466         u_long net, mask;
 467         u_long i;
 468         int subnetshift;
 469
 470         switch (sa->sa_family) {
 471
 472         case AF_INET:
 473             {   struct in_addr in;
 474                 in = ((struct sockaddr_in *)sa)->sin_addr;
 475
 476                 i = in.s_addr = ntohl(in.s_addr);
 477                 if (in.s_addr == 0)
 478                         cp = "default";
 479                 else if (!nflag) {
 480                         if (IN_CLASSA(i)) {
 481                                 mask = IN_CLASSA_NET;
 482                                 subnetshift = 8;
 483                         } else if (IN_CLASSB(i)) {
 484                                 mask = IN_CLASSB_NET;
 485                                 subnetshift = 8;
 486                         } else {
 487                                 mask = IN_CLASSC_NET;
 488                                 subnetshift = 4;
 489                         }
 490                         /*
 491                          * If there are more bits than the standard mask
 492                          * would suggest, subnets must be in use.
 493                          * Guess at the subnet mask, assuming reasonable
 494                          * width subnet fields.
 495                          */
 496                         while (in.s_addr &~ mask)
 497                                 mask = (long)mask >> subnetshift;
 498                         net = in.s_addr & mask;
 499                         while ((mask & 1) == 0)
 500                                 mask >>= 1, net >>= 1;
 501                         np = getnetbyaddr(net, AF_INET);
 502                         if (np != NULL)
 503                                 cp = np->n_name;
 504                 }
 505 #define C(x)    (unsigned)((x) & 0xff)
 506                 if (cp != NULL)
 507                         strncpy(line, cp, sizeof(line));
 508                 else if ((in.s_addr & 0xffffff) == 0)
 509                         sprintf(line, "%u", C(in.s_addr >> 24));
 510                 else if ((in.s_addr & 0xffff) == 0)
 511                         sprintf(line, "%u.%u", C(in.s_addr >> 24),
 512                             C(in.s_addr >> 16));
 513                 else if ((in.s_addr & 0xff) == 0)
 514                         sprintf(line, "%u.%u.%u", C(in.s_addr >> 24),
 515                             C(in.s_addr >> 16), C(in.s_addr >> 8));
 516                 else
 517                         sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
 518                             C(in.s_addr >> 16), C(in.s_addr >> 8),
 519                             C(in.s_addr));
 520 #undef C
 521                 break;
 522             }
 523
 524 #ifdef INET6
 525         case AF_INET6:
 526         {
 527                 struct sockaddr_in6 sin6; /* use static var for safety */
 528                 int niflags = 0;
 529 #ifdef NI_WITHSCOPEID
 530                 niflags = NI_WITHSCOPEID;
 531 #endif
 532
 533                 memset(&sin6, 0, sizeof(sin6));
 534                 memcpy(&sin6, sa, sa->sa_len);
 535                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 536                 sin6.sin6_family = AF_INET6;
 537 #ifdef __KAME__
 538                 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
 539                     (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 540                      IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
 541                     sin6.sin6_scope_id == 0) {
 542                         sin6.sin6_scope_id =
 543                             ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 544                         sin6.sin6_addr.s6_addr[2] = 0;
 545                         sin6.sin6_addr.s6_addr[3] = 0;
 546                 }
 547 #endif
 548                 if (nflag)
 549                         niflags |= NI_NUMERICHOST;
 550                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 551                     line, sizeof(line), NULL, 0, niflags) != 0)
 552                         strncpy(line, "invalid", sizeof(line));
 553
 554                 return(line);
 555         }
 556 #endif
 557
 558         case AF_APPLETALK:
 559                 snprintf(line, sizeof(line), "atalk %s",
 560                         atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr));
 561                 break;
 562
 563 #ifdef NS
 564         case AF_NS:
 565                 return(ns_print((struct sockaddr_ns *)sa));
 566                 break;
 567 #endif
 568
 569         case AF_LINK:
 570                 return(link_ntoa((struct sockaddr_dl *)sa));
 571
 572
 573         default:
 574             {
 575                 /*
 576                  * Unknown address family; just render the raw
 577                  * data in sa->sa_data as hex values.
 578                  */
 579                 uint8_t *sp = (uint8_t *)sa->sa_data;
 580                 uint8_t *splim = (uint8_t *)sa + sa->sa_len;
 581                 char *cps = line + sprintf(line, "af %d:", sa->sa_family);
 582                 char *cpe = line + sizeof(line);
 583
 584                 while (sp < splim && cps < cpe)
 585                         cps += snprintf(cps, cpe - cps, " %02x", *sp++);
 586                 break;
 587             }
 588         }
 589         return(line);
 590 }
 591
 592 static void
 593 set_metric(char *value, int key)
 594 {
 595         int flag = 0;
 596         u_long noval, *valp = &noval;
 597
 598         switch (key) {
 599 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
 600         caseof(K_MTU, RTV_MTU, rmx_mtu);
 601         caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
 602         caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
 603         caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
 604         caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
 605         caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
 606         caseof(K_RTT, RTV_RTT, rmx_rtt);
 607         caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
 608         }
 609         rtm_inits |= flag;
 610         if (lockrest || locking)
 611                 rt_metrics.rmx_locks |= flag;
 612         if (locking)
 613                 locking = 0;
 614         *valp = atoi(value);
 615 }
 616
 617 static void
 618 newroute(int argc, char **argv)
 619 {
 620         char *cmd;
 621         const char *err_str, *dest = "", *gateway = "";
 622         int ishost = 0, proxy = 0, ret, attempts, oerrno, flags = RTF_STATIC;
 623         int key;
 624         struct hostent *hp = 0;
 625
 626         if (uid != 0) {
 627                 errx(EX_NOPERM, "must be root to alter routing table");
 628         }
 629         cmd = argv[0];
 630         if (*cmd != 'g')
 631                 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 632         while (--argc > 0) {
 633                 if (**(++argv)== '-') {
 634                         switch (key = keyword(1 + *argv)) {
 635                         case K_LINK:
 636                                 af = AF_LINK;
 637                                 aflen = sizeof(struct sockaddr_dl);
 638                                 break;
 639                         case K_INET:
 640                                 af = AF_INET;
 641                                 aflen = sizeof(struct sockaddr_in);
 642                                 break;
 643 #ifdef INET6
 644                         case K_INET6:
 645                                 af = AF_INET6;
 646                                 aflen = sizeof(struct sockaddr_in6);
 647                                 break;
 648 #endif
 649                         case K_ATALK:
 650                                 af = AF_APPLETALK;
 651                                 aflen = sizeof(struct sockaddr_at);
 652                                 break;
 653                         case K_SA:
 654                                 af = PF_ROUTE;
 655                                 aflen = sizeof(union sockunion);
 656                                 break;
 657 #ifdef NS
 658                         case K_XNS:
 659                                 af = AF_NS;
 660                                 aflen = sizeof(struct sockaddr_ns);
 661                                 break;
 662 #endif
 663                         case K_IFACE:
 664                         case K_INTERFACE:
 665                                 iflag++;
 666                                 break;
 667                         case K_NOSTATIC:
 668                                 flags &= ~RTF_STATIC;
 669                                 break;
 670                         case K_LLINFO:
 671                                 flags |= RTF_LLINFO;
 672                                 break;
 673                         case K_LOCK:
 674                                 locking = 1;
 675                                 break;
 676                         case K_LOCKREST:
 677                                 lockrest = 1;
 678                                 break;
 679                         case K_HOST:
 680                                 forcehost++;
 681                                 break;
 682                         case K_REJECT:
 683                                 flags |= RTF_REJECT;
 684                                 break;
 685                         case K_BLACKHOLE:
 686                                 flags |= RTF_BLACKHOLE;
 687                                 break;
 688                         case K_PROTO1:
 689                                 flags |= RTF_PROTO1;
 690                                 break;
 691                         case K_PROTO2:
 692                                 flags |= RTF_PROTO2;
 693                                 break;
 694                         case K_PROXY:
 695                                 proxy = 1;
 696                                 break;
 697                         case K_CLONING:
 698                                 flags |= RTF_CLONING;
 699                                 break;
 700                         case K_XRESOLVE:
 701                                 flags |= RTF_XRESOLVE;
 702                                 break;
 703                         case K_STATIC:
 704                                 flags |= RTF_STATIC;
 705                                 break;
 706                         case K_IFA:
 707                                 if (--argc == 0)
 708                                         usage((char *)NULL);
 709                                 getaddr(RTA_IFA, *++argv, 0);
 710                                 break;
 711                         case K_IFP:
 712                                 if (--argc == 0)
 713                                         usage((char *)NULL);
 714                                 getaddr(RTA_IFP, *++argv, 0);
 715                                 break;
 716                         case K_GENMASK:
 717                                 if (--argc == 0)
 718                                         usage((char *)NULL);
 719                                 getaddr(RTA_GENMASK, *++argv, 0);
 720                                 break;
 721                         case K_GATEWAY:
 722                                 if (--argc == 0)
 723                                         usage((char *)NULL);
 724                                 getaddr(RTA_GATEWAY, *++argv, 0);
 725                                 break;
 726                         case K_DST:
 727                                 if (--argc == 0)
 728                                         usage((char *)NULL);
 729                                 ishost = getaddr(RTA_DST, *++argv, &hp);
 730                                 dest = *argv;
 731                                 break;
 732                         case K_NETMASK:
 733                                 if (--argc == 0)
 734                                         usage((char *)NULL);
 735                                 getaddr(RTA_NETMASK, *++argv, 0);
 736                                 /* FALLTHROUGH */
 737                         case K_NET:
 738                                 forcenet++;
 739                                 break;
 740                         case K_PREFIXLEN:
 741                                 if (--argc == 0)
 742                                         usage((char *)NULL);
 743                                 if (prefixlen(*++argv) == -1) {
 744                                         forcenet = 0;
 745                                         ishost = 1;
 746                                 } else {
 747                                         forcenet = 1;
 748                                         ishost = 0;
 749                                 }
 750                                 break;
 751                         case K_MPLS:
 752                                 af = AF_MPLS;
 753                                 aflen = sizeof(struct sockaddr_mpls);
 754                                 break;
 755                         case K_POP:
 756                                 flags |= RTF_MPLSOPS;
 757                                 af = AF_MPLS;
 758                                 mplsop = MPLSLOP_POP;
 759                                 switch(++popcount){
 760                                         case 1:
 761                                                 getaddr(RTA_MPLS1, "", 0);
 762                                                 break;
 763                                         case 2:
 764                                                 getaddr(RTA_MPLS2, "", 0);
 765                                                 break;
 766                                         case 3:
 767                                                 getaddr(RTA_MPLS3, "", 0);
 768                                                 break;
 769                                 }
 770                                 break;
 771                         case K_PUSH:
 772                         case K_SWAP:
 773                                 if (popcount > 0) {
 774                                         warnx("Push or swap after pop. Ignoring.");
 775                                         break;
 776                                 }
 777                                 if (key == K_PUSH) {
 778                                         mplsop = MPLSLOP_PUSH;
 779                                         ++pushcount;
 780                                 } else {
 781                                         if (pushcount > 0) {
 782                                                 warnx("Swap after push. Ignoring.");
 783                                                 break;
 784                                         }
 785                                         if (swapcount > 0) {
 786                                                 warnx("Too many swaps. Ignoring.");
 787                                                 break;
 788                                         }
 789                                         mplsop = MPLSLOP_SWAP;
 790                                         ++swapcount;
 791                                 }
 792                                 flags |= RTF_MPLSOPS;
 793                                 af = AF_MPLS;
 794                                 aflen = sizeof(struct sockaddr_mpls);
 795                                 if (--argc == 0)
 796                                         usage((char *)NULL);
 797                                 switch(pushcount + swapcount){
 798                                         case 1:
 799                                                 getaddr(RTA_MPLS1, *++argv, 0);
 800                                                 break;
 801                                         case 2:
 802                                                 getaddr(RTA_MPLS2, *++argv, 0);
 803                                                 break;
 804                                         case 3:
 805                                                 getaddr(RTA_MPLS3, *++argv, 0);
 806                                                 break;
 807                                 }
 808                                 break;
 809                         case K_MTU:
 810                         case K_HOPCOUNT:
 811                         case K_EXPIRE:
 812                         case K_RECVPIPE:
 813                         case K_SENDPIPE:
 814                         case K_SSTHRESH:
 815                         case K_RTT:
 816                         case K_RTTVAR:
 817                                 if (--argc == 0)
 818                                         usage((char *)NULL);
 819                                 set_metric(*++argv, key);
 820                                 break;
 821                         default:
 822                                 usage(1+*argv);
 823                         }
 824                 } else {
 825                         if ((rtm_addrs & RTA_DST) == 0) {
 826                                 dest = *argv;
 827                                 ishost = getaddr(RTA_DST, *argv, &hp);
 828                         } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
 829                                 gateway = *argv;
 830                                 getaddr(RTA_GATEWAY, *argv, &hp);
 831                         } else {
 832                                 getaddr(RTA_NETMASK, *argv, 0);
 833                                 forcenet = 1;
 834                         }
 835                 }
 836         }
 837         if (forcehost) {
 838                 ishost = 1;
 839 #ifdef INET6
 840                 if (af == AF_INET6) {
 841                         rtm_addrs &= ~RTA_NETMASK;
 842                         memset((void *)&so_mask, 0, sizeof(so_mask));
 843                 }
 844 #endif
 845         }
 846         if (forcenet)
 847                 ishost = 0;
 848         flags |= RTF_UP;
 849         if (ishost)
 850                 flags |= RTF_HOST;
 851         if (iflag == 0)
 852                 flags |= RTF_GATEWAY;
 853         if (proxy) {
 854                 so_dst.sinarp.sin_other = SIN_PROXY;
 855                 flags |= RTF_ANNOUNCE;
 856         }
 857         for (attempts = 1; ; attempts++) {
 858                 errno = 0;
 859                 if ((ret = rtmsg(*cmd, flags)) == 0)
 860                         break;
 861                 if (errno != ENETUNREACH && errno != ESRCH)
 862                         break;
 863                 if (af == AF_INET && *gateway != '\0' &&
 864                     hp != NULL && hp->h_addr_list[1] != NULL) {
 865                         hp->h_addr_list++;
 866                         memmove(&so_gate.sin.sin_addr,
 867                                 hp->h_addr_list[0],
 868                                 MIN((size_t)hp->h_length,
 869                                     sizeof(so_gate.sin.sin_addr)));
 870                 } else
 871                         break;
 872         }
 873         if (*cmd == 'g')
 874                 exit(0);
 875         if (!qflag) {
 876                 oerrno = errno;
 877                 printf("%s %s %s", cmd, ishost? "host" : "net", dest);
 878                 if (*gateway != '\0') {
 879                         printf(": gateway %s", gateway);
 880                         if (attempts > 1 && ret == 0 && af == AF_INET)
 881                             printf(" (%s)",
 882                                 inet_ntoa(((struct sockaddr_in *)&route.rt_gateway)->sin_addr));
 883                 }
 884                 if (ret == 0) {
 885                         printf("\n");
 886                 } else {
 887                         switch (oerrno) {
 888                         case ESRCH:
 889                                 err_str = "not in table";
 890                                 break;
 891                         case EBUSY:
 892                                 err_str = "entry in use";
 893                                 break;
 894                         case ENOBUFS:
 895                                 err_str = "routing table overflow";
 896                                 break;
 897                         case EDQUOT: /* handle recursion avoidance in
 898                                         rt_setgate() */
 899                                 err_str = "gateway uses the same route";
 900                                 break;
 901                         default:
 902                                 err_str = strerror(oerrno);
 903                                 break;
 904                         }
 905                         printf(": %s\n", err_str);
 906                 }
 907         }
 908         exit(ret != 0);
 909 }
 910
 911 static void
 912 inet_makenetandmask(u_long net, struct sockaddr_in *in, u_long bits)
 913 {
 914         u_long addr, mask = 0;
 915         char *cp;
 916
 917         rtm_addrs |= RTA_NETMASK;
 918         if (net <= 0xff)
 919                 addr = net << 24;
 920         else if (net <= 0xffff)
 921                 addr = net << 16;
 922         else if (net <= 0xffffff)
 923                 addr = net << 8;
 924         else
 925                 addr = net;
 926
 927         if (bits)
 928                 mask = 0xffffffff << (32 - bits);
 929         else {
 930                 if (IN_CLASSA(addr)) {
 931                         mask = IN_CLASSA_NET;
 932                 } else if (IN_CLASSB(addr)) {
 933                         mask = IN_CLASSB_NET;
 934                 } else if (IN_CLASSC(addr)) {
 935                         mask = IN_CLASSC_NET;
 936                 } else
 937                         mask = 0xffffffff;
 938         }
 939         in->sin_addr.s_addr = htonl(addr);
 940         in = &so_mask.sin;
 941         in->sin_addr.s_addr = htonl(mask);
 942         in->sin_len = 0;
 943         in->sin_family = 0;
 944         cp = (char *)(&in->sin_addr + 1);
 945         while (*--cp == 0 && cp > (char *)in)
 946                 ;
 947         in->sin_len = 1 + cp - (char *)in;
 948 }
 949
 950 #ifdef INET6
 951 /*
 952  * XXX the function may need more improvement...
 953  */
 954 static int
 955 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
 956 {
 957         struct in6_addr in6;
 958
 959         if (plen == NULL) {
 960                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
 961                     sin6->sin6_scope_id == 0) {
 962                         plen = "0";
 963                 } else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
 964                         /* aggregatable global unicast - RFC2374 */
 965                         memset(&in6, 0, sizeof(in6));
 966                         if (memcmp(&sin6->sin6_addr.s6_addr[8],
 967                                    &in6.s6_addr[8], 8) == 0)
 968                                 plen = "64";
 969                 }
 970         }
 971
 972         if (plen == NULL || strcmp(plen, "128") == 0)
 973                 return(1);
 974         rtm_addrs |= RTA_NETMASK;
 975         prefixlen(plen);
 976         return(0);
 977 }
 978 #endif
 979
 980 /*
 981  * Interpret an argument as a network address of some kind,
 982  * returning 1 if a host address, 0 if a network address.
 983  */
 984 static int
 985 getaddr(int which, char *str, struct hostent **hpp)
 986 {
 987         sup su;
 988         struct hostent *hp;
 989         struct netent *np;
 990         u_long val;
 991         char *q;
 992         int afamily;  /* local copy of af so we can change it */
 993
 994         if (af == 0) {
 995                 af = AF_INET;
 996                 aflen = sizeof(struct sockaddr_in);
 997         }
 998         afamily = af;
 999         rtm_addrs |= which;
1000         switch (which) {
1001         case RTA_DST:
1002                 su = &so_dst;
1003                 break;
1004         case RTA_GATEWAY:
1005                 su = &so_gate;
1006                 if (iflag) {
1007                         struct ifaddrs *ifap, *ifa;
1008                         struct sockaddr_dl *sdl = NULL;
1009
1010                         if (getifaddrs(&ifap))
1011                                 err(1, "getifaddrs");
1012
1013                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
1014                                 if (ifa->ifa_addr->sa_family != AF_LINK)
1015                                         continue;
1016
1017                                 if (strcmp(str, ifa->ifa_name) != 0)
1018                                         continue;
1019
1020                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1021                         }
1022                         /* If we found it, then use it */
1023                         if (sdl != NULL) {
1024                                 /*
1025                                  * Copy is safe since we have a
1026                                  * sockaddr_storage member in sockunion{}.
1027                                  * Note that we need to copy before calling
1028                                  * freeifaddrs().
1029                                  *
1030                                  * Interface routes are routed only by their
1031                                  * sdl_index or interface name (we provide
1032                                  * both here), not by the ARP address of the
1033                                  * local interface (alen, slen = 0).
1034                                  */
1035                                 memcpy(&su->sdl, sdl, sdl->sdl_len);
1036                                 su->sdl.sdl_alen = 0;
1037                                 su->sdl.sdl_slen = 0;
1038                         }
1039                         freeifaddrs(ifap);
1040                         if (sdl != NULL)
1041                                 return(1);
1042                 }
1043                 break;
1044         case RTA_NETMASK:
1045                 su = &so_mask;
1046                 break;
1047         case RTA_GENMASK:
1048                 su = &so_genmask;
1049                 break;
1050         case RTA_IFP:
1051                 su = &so_ifp;
1052                 afamily = AF_LINK;
1053                 break;
1054         case RTA_IFA:
1055                 su = &so_ifa;
1056                 break;
1057         case RTA_MPLS1:
1058                 su = &so_mpls1;
1059                 break;
1060         case RTA_MPLS2:
1061                 su = &so_mpls2;
1062                 break;
1063         case RTA_MPLS3:
1064                 su = &so_mpls3;
1065                 break;
1066         default:
1067                 usage("internal error");
1068                 /*NOTREACHED*/
1069         }
1070         su->sa.sa_len = aflen;
1071         su->sa.sa_family = afamily; /* cases that don't want it have left
1072                                        already */
1073         if (strcmp(str, "default") == 0) {
1074                 /*
1075                  * Default is net 0.0.0.0/0
1076                  */
1077                 switch (which) {
1078                 case RTA_DST:
1079                         forcenet++;
1080                         /* bzero(su, sizeof(*su)); *//* for readability */
1081                         getaddr(RTA_NETMASK, str, 0);
1082                         break;
1083                 case RTA_NETMASK:
1084                 case RTA_GENMASK:
1085                         /* bzero(su, sizeof(*su)); *//* for readability */
1086                         break;
1087                 }
1088                 return(0);
1089         }
1090         switch (afamily) {
1091 #ifdef INET6
1092         case AF_INET6:
1093         {
1094                 struct addrinfo hints, *res;
1095
1096                 q = NULL;
1097                 if (which == RTA_DST && (q = strchr(str, '/')) != NULL)
1098                         *q = '\0';
1099                 memset(&hints, 0, sizeof(hints));
1100                 hints.ai_family = afamily;      /*AF_INET6*/
1101                 hints.ai_flags = AI_NUMERICHOST;
1102                 hints.ai_socktype = SOCK_DGRAM;         /*dummy*/
1103                 if (getaddrinfo(str, "0", &hints, &res) != 0 ||
1104                     res->ai_family != AF_INET6 ||
1105                     res->ai_addrlen != sizeof(su->sin6)) {
1106                         fprintf(stderr, "%s: bad value\n", str);
1107                         exit(1);
1108                 }
1109                 memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6));
1110 #ifdef __KAME__
1111                 if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) ||
1112                      IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr)) &&
1113                     su->sin6.sin6_scope_id) {
1114                         *(u_int16_t *)&su->sin6.sin6_addr.s6_addr[2] =
1115                                 htons(su->sin6.sin6_scope_id);
1116                         su->sin6.sin6_scope_id = 0;
1117                 }
1118 #endif
1119                 freeaddrinfo(res);
1120                 if (q != NULL)
1121                         *q++ = '/';
1122                 if (which == RTA_DST)
1123                         return(inet6_makenetandmask(&su->sin6, q));
1124                 return(0);
1125         }
1126 #endif /* INET6 */
1127
1128 #ifdef NS
1129         case AF_NS:
1130                 if (which == RTA_DST) {
1131                         struct sockaddr_ns *sms = &(so_mask.sns);
1132                         memset(sms, 0, sizeof(*sms));
1133                         sms->sns_family = 0;
1134                         sms->sns_len = 6;
1135                         sms->sns_addr.x_net = *(union ns_net *)ns_bh;
1136                         rtm_addrs |= RTA_NETMASK;
1137                 }
1138                 su->sns.sns_addr = ns_addr(str);
1139                 return(!ns_nullhost(su->sns.sns_addr));
1140 #endif
1141
1142         case AF_APPLETALK:
1143                 if (!atalk_aton(str, &su->sat.sat_addr))
1144                         errx(EX_NOHOST, "bad address: %s", str);
1145                 rtm_addrs |= RTA_NETMASK;
1146                 return(forcehost || su->sat.sat_addr.s_node != 0);
1147
1148         case AF_LINK:
1149                 link_addr(str, &su->sdl);
1150                 return(1);
1151
1152         case PF_ROUTE:
1153                 su->sa.sa_len = sizeof(*su);
1154                 sockaddr(str, &su->sa);
1155                 return(1);
1156
1157         case AF_MPLS:
1158         {
1159                 mpls_label_t label;
1160
1161                 bzero(su, sizeof(*su));
1162                 su->sa.sa_len = sizeof(*su);
1163                 su->sa.sa_family = AF_MPLS;
1164                 su->smpls.smpls_op = mplsop;
1165                 if (mplsop != MPLSLOP_POP && mplsop != MPLSLOP_POPALL &&
1166                     *str != '\0') {
1167                         if (sscanf(str, "%u", &label) != 1)
1168                                 errx(EX_NOHOST, "bad address: %s", str);
1169                         su->smpls.smpls_label = htonl(label);
1170                 }
1171                 return(1);
1172         }
1173
1174         case AF_INET:
1175         default:
1176                 break;
1177         }
1178
1179         if (hpp == NULL)
1180                 hpp = &hp;
1181         *hpp = NULL;
1182
1183         q = strchr(str,'/');
1184         if (q != NULL && which == RTA_DST) {
1185                 *q = '\0';
1186                 if ((val = inet_network(str)) != INADDR_NONE) {
1187                         inet_makenetandmask(
1188                                 val, &su->sin, strtoul(q+1, 0, 0));
1189                         return(0);
1190                 }
1191                 *q = '/';
1192         }
1193         if ((which != RTA_DST || forcenet == 0) &&
1194             inet_aton(str, &su->sin.sin_addr)) {
1195                 val = su->sin.sin_addr.s_addr;
1196                 if (which != RTA_DST ||
1197                     inet_lnaof(su->sin.sin_addr) != INADDR_ANY)
1198                         return(1);
1199                 else {
1200                         val = ntohl(val);
1201                         goto netdone;
1202                 }
1203         }
1204         if (which == RTA_DST && forcehost == 0 &&
1205             ((val = inet_network(str)) != INADDR_NONE ||
1206             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1207 netdone:
1208                 inet_makenetandmask(val, &su->sin, 0);
1209                 return(0);
1210         }
1211         hp = gethostbyname(str);
1212         if (hp != NULL) {
1213                 *hpp = hp;
1214                 su->sin.sin_family = hp->h_addrtype;
1215                 memmove((char *)&su->sin.sin_addr, hp->h_addr,
1216                     MIN((size_t)hp->h_length, sizeof(su->sin.sin_addr)));
1217                 return(1);
1218         }
1219         errx(EX_NOHOST, "bad address: %s", str);
1220 }
1221
1222 static int
1223 prefixlen(const char *len_str)
1224 {
1225         int len = atoi(len_str), q, r;
1226         int max;
1227         char *p;
1228
1229         rtm_addrs |= RTA_NETMASK;
1230         switch (af) {
1231 #ifdef INET6
1232         case AF_INET6:
1233                 max = 128;
1234                 p = (char *)&so_mask.sin6.sin6_addr;
1235                 break;
1236 #endif
1237         case AF_INET:
1238                 max = 32;
1239                 p = (char *)&so_mask.sin.sin_addr;
1240                 break;
1241         default:
1242                 fprintf(stderr, "prefixlen not supported in this af\n");
1243                 exit(1);
1244                 /*NOTREACHED*/
1245         }
1246
1247         if (len < 0 || max < len) {
1248                 fprintf(stderr, "%s: bad value\n", len_str);
1249                 exit(1);
1250         }
1251
1252         q = len >> 3;
1253         r = len & 7;
1254         so_mask.sa.sa_family = af;
1255         so_mask.sa.sa_len = aflen;
1256         memset((void *)p, 0, max / 8);
1257         if (q > 0)
1258                 memset((void *)p, 0xff, q);
1259         if (r > 0)
1260                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1261         if (len == max)
1262                 return(-1);
1263         else
1264                 return(len);
1265 }
1266
1267 #ifdef NS
1268 short ns_nullh[] = {0,0,0};
1269
1270 char *
1271 ns_print(struct sockaddr_ns *sns)
1272 {
1273         struct ns_addr work;
1274         union { union ns_net net_e; u_long long_e; } net;
1275         u_short port;
1276         static char mybuf[50+MAXHOSTNAMELEN], cport[10], chost[25];
1277         const char *host = "";
1278         char *p;
1279         u_char *q;
1280
1281         work = sns->sns_addr;
1282         port = ntohs(work.x_port);
1283         work.x_port = 0;
1284         net.net_e  = work.x_net;
1285         if (ns_nullhost(work) && net.long_e == 0) {
1286                 if (port == 0)
1287                         strncpy(mybuf, "*.*", sizeof(mybuf));
1288                 else
1289                         sprintf(mybuf, "*.%XH", port);
1290                 return(mybuf);
1291         }
1292
1293         if (memcmp(ns_bh, work.x_host.c_host, 6) == 0)
1294                 host = "any";
1295         else if (memcmp(ns_nullh, work.x_host.c_host, 6) == 0)
1296                 host = "*";
1297         else {
1298                 q = work.x_host.c_host;
1299                 sprintf(chost, "%02X%02X%02X%02X%02X%02XH",
1300                         q[0], q[1], q[2], q[3], q[4], q[5]);
1301                 for (p = chost; *p == '0' && p < chost + 12; p++)
1302                         /* void */;
1303                 host = p;
1304         }
1305         if (port != 0)
1306                 sprintf(cport, ".%XH", htons(port));
1307         else
1308                 *cport = 0;
1309
1310         snprintf(mybuf, sizeof(mybuf), "%lxH.%s%s",
1311                         (unsigned long)ntohl(net.long_e),
1312                         host, cport);
1313         return(mybuf);
1314 }
1315 #endif
1316
1317 static void
1318 interfaces(void)
1319 {
1320         size_t needed;
1321         int mib[6];
1322         char *buf, *lim, *next;
1323         struct rt_msghdr *rtm;
1324
1325         mib[0] = CTL_NET;
1326         mib[1] = PF_ROUTE;
1327         mib[2] = 0;             /* protocol */
1328         mib[3] = 0;             /* wildcard address family */
1329         mib[4] = NET_RT_IFLIST;
1330         mib[5] = 0;             /* no flags */
1331         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
1332                 err(EX_OSERR, "route-sysctl-estimate");
1333         if ((buf = malloc(needed)) == NULL)
1334                 errx(EX_OSERR, "malloc failed");
1335         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
1336                 err(EX_OSERR, "actual retrieval of interface table");
1337         lim = buf + needed;
1338         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1339                 rtm = (struct rt_msghdr *)next;
1340                 print_rtmsg(rtm, rtm->rtm_msglen);
1341         }
1342 }
1343
1344 static void
1345 monitor(void)
1346 {
1347         int n;
1348         char msg[2048];
1349
1350         verbose = 1;
1351         if (debugonly) {
1352                 interfaces();
1353                 exit(0);
1354         }
1355         for (;;) {
1356                 time_t now;
1357                 n = read(s, msg, 2048);
1358                 now = time(NULL);
1359                 printf("\ngot message of size %d on %s", n, ctime(&now));
1360                 print_rtmsg((struct rt_msghdr *)msg, n);
1361         }
1362 }
1363
1364 struct {
1365         struct  rt_msghdr m_rtm;
1366         char    m_space[512];
1367 } m_rtmsg;
1368
1369 static int
1370 rtmsg(int cmd, int flags)
1371 {
1372         static int seq;
1373         int rlen;
1374         char *cp = m_rtmsg.m_space;
1375         int l;
1376
1377 #define NEXTADDR(w, u) \
1378         if (rtm_addrs & (w)) {\
1379             l = ROUNDUP(u.sa.sa_len); memmove(cp, &(u), l); cp += l;\
1380             if (verbose) sodump(&(u),"u");\
1381         }
1382
1383         errno = 0;
1384         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1385         if (cmd == 'a')
1386                 cmd = RTM_ADD;
1387         else if (cmd == 'c')
1388                 cmd = RTM_CHANGE;
1389         else if (cmd == 'g') {
1390                 cmd = RTM_GET;
1391                 if (so_ifp.sa.sa_family == 0) {
1392                         so_ifp.sa.sa_family = AF_LINK;
1393                         so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
1394                         rtm_addrs |= RTA_IFP;
1395                 }
1396         } else
1397                 cmd = RTM_DELETE;
1398 #define rtm m_rtmsg.m_rtm
1399         rtm.rtm_type = cmd;
1400         rtm.rtm_flags = flags;
1401         rtm.rtm_version = RTM_VERSION;
1402         rtm.rtm_seq = ++seq;
1403         rtm.rtm_addrs = rtm_addrs;
1404         rtm.rtm_rmx = rt_metrics;
1405         rtm.rtm_inits = rtm_inits;
1406
1407         if (rtm_addrs & RTA_NETMASK)
1408                 mask_addr();
1409         NEXTADDR(RTA_DST, so_dst);
1410         NEXTADDR(RTA_GATEWAY, so_gate);
1411         NEXTADDR(RTA_NETMASK, so_mask);
1412         NEXTADDR(RTA_GENMASK, so_genmask);
1413         NEXTADDR(RTA_IFP, so_ifp);
1414         NEXTADDR(RTA_IFA, so_ifa);
1415         NEXTADDR(RTA_MPLS1, so_mpls1);
1416         NEXTADDR(RTA_MPLS2, so_mpls2);
1417         NEXTADDR(RTA_MPLS3, so_mpls3);
1418         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1419         if (verbose)
1420                 print_rtmsg(&rtm, l);
1421         if (debugonly)
1422                 return(0);
1423         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1424                 warn("writing to routing socket");
1425                 return(-1);
1426         }
1427         if (cmd == RTM_GET) {
1428                 do {
1429                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1430                 } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
1431                 if (l < 0)
1432                         warn("read from routing socket");
1433                 else
1434                         print_getmsg(&rtm, l);
1435         }
1436 #undef rtm
1437         return(0);
1438 }
1439
1440 static void
1441 mask_addr(void)
1442 {
1443         int olen = so_mask.sa.sa_len;
1444         char *cp1 = olen + (char *)&so_mask, *cp2;
1445
1446         for (so_mask.sa.sa_len = 0; cp1 > (char *)&so_mask; )
1447                 if (*--cp1 != 0) {
1448                         so_mask.sa.sa_len = 1 + cp1 - (char *)&so_mask;
1449                         break;
1450                 }
1451         if ((rtm_addrs & RTA_DST) == 0)
1452                 return;
1453         switch (so_dst.sa.sa_family) {
1454 #ifdef NS
1455         case AF_NS:
1456 #endif
1457         case AF_INET:
1458 #ifdef INET6
1459         case AF_INET6:
1460 #endif
1461         case AF_APPLETALK:
1462         case 0:
1463                 return;
1464         }
1465         cp1 = so_mask.sa.sa_len + 1 + (char *)&so_dst;
1466         cp2 = so_dst.sa.sa_len + 1 + (char *)&so_dst;
1467         while (cp2 > cp1)
1468                 *--cp2 = 0;
1469         cp2 = so_mask.sa.sa_len + 1 + (char *)&so_mask;
1470         while (cp1 > so_dst.sa.sa_data)
1471                 *--cp1 &= *--cp2;
1472 }
1473
1474 const char *msgtypes[] = {
1475         "",
1476         "RTM_ADD: Add Route",
1477         "RTM_DELETE: Delete Route",
1478         "RTM_CHANGE: Change Metrics or flags",
1479         "RTM_GET: Report Metrics",
1480         "RTM_LOSING: Kernel Suspects Partitioning",
1481         "RTM_REDIRECT: Told to use different route",
1482         "RTM_MISS: Lookup failed on this address",
1483         "RTM_LOCK: fix specified metrics",
1484         "RTM_OLDADD: caused by SIOCADDRT",
1485         "RTM_OLDDEL: caused by SIOCDELRT",
1486         "RTM_RESOLVE: Route created by cloning",
1487         "RTM_NEWADDR: address being added to iface",
1488         "RTM_DELADDR: address being removed from iface",
1489         "RTM_IFINFO: iface status change",
1490         "RTM_NEWMADDR: new multicast group membership on iface",
1491         "RTM_DELMADDR: multicast group membership removed from iface",
1492         "RTM_IFANNOUNCE: interface arrival/departure",
1493         0,
1494 };
1495
1496 char metricnames[] =
1497 "\011pksent\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire\2hopcount"
1498 "\1mtu";
1499 char routeflags[] =
1500 "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE\010MASK_PRESENT"
1501 "\011CLONING\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE\016b016"
1502 "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3\024CHAINDELETE"
1503 "\025PINNED\026LOCAL\027BROADCAST\030MULTICAST";
1504 char ifnetflags[] =
1505 "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1506 "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1507 "\017LINK2\020MULTICAST";
1508 char addrnames[] =
1509 "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD"
1510 "\011MPLS1\012MPLS2\013MPLS3";
1511
1512 static void
1513 print_rtmsg(struct rt_msghdr *rtm, int msglen __unused)
1514 {
1515         struct if_msghdr *ifm;
1516         struct ifa_msghdr *ifam;
1517 #ifdef RTM_NEWMADDR
1518         struct ifma_msghdr *ifmam;
1519 #endif
1520         struct if_announcemsghdr *ifan;
1521
1522         if (verbose == 0)
1523                 return;
1524         if (rtm->rtm_version != RTM_VERSION) {
1525                 printf("routing message version %d not understood\n",
1526                     rtm->rtm_version);
1527                 return;
1528         }
1529         if (msgtypes[rtm->rtm_type] != NULL)
1530                 printf("%s: ", msgtypes[rtm->rtm_type]);
1531         else
1532                 printf("#%d: ", rtm->rtm_type);
1533         printf("len %d, ", rtm->rtm_msglen);
1534         switch (rtm->rtm_type) {
1535         case RTM_IFINFO:
1536                 ifm = (struct if_msghdr *)rtm;
1537                 printf("if# %d, flags:", ifm->ifm_index);
1538                 bprintf(stdout, ifm->ifm_flags, ifnetflags);
1539                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs);
1540                 break;
1541         case RTM_NEWADDR:
1542         case RTM_DELADDR:
1543                 ifam = (struct ifa_msghdr *)rtm;
1544                 printf("metric %d, flags:", ifam->ifam_metric);
1545                 bprintf(stdout, ifam->ifam_flags, routeflags);
1546                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs);
1547                 break;
1548 #ifdef RTM_NEWMADDR
1549         case RTM_NEWMADDR:
1550         case RTM_DELMADDR:
1551                 ifmam = (struct ifma_msghdr *)rtm;
1552                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs);
1553                 break;
1554 #endif
1555         case RTM_IFANNOUNCE:
1556                 ifan = (struct if_announcemsghdr *)rtm;
1557                 printf("if# %d, what: ", ifan->ifan_index);
1558                 switch (ifan->ifan_what) {
1559                 case IFAN_ARRIVAL:
1560                         printf("arrival");
1561                         break;
1562                 case IFAN_DEPARTURE:
1563                         printf("departure");
1564                         break;
1565                 default:
1566                         printf("#%d", ifan->ifan_what);
1567                         break;
1568                 }
1569                 printf("\n");
1570                 break;
1571
1572         default:
1573                 printf("pid: %ld, seq %d, errno %d, flags:",
1574                         (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1575                 bprintf(stdout, rtm->rtm_flags, routeflags);
1576                 pmsg_common(rtm);
1577         }
1578 }
1579
1580 static void
1581 print_getmsg(struct rt_msghdr *rtm, int msglen)
1582 {
1583         struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
1584         struct sockaddr_dl *ifp = NULL;
1585         struct sockaddr *sa;
1586         char *cp;
1587         int i;
1588
1589         printf("   route to: %s\n", routename(&so_dst.sa));
1590         if (rtm->rtm_version != RTM_VERSION) {
1591                 warnx("routing message version %d not understood",
1592                      rtm->rtm_version);
1593                 return;
1594         }
1595         if (rtm->rtm_msglen > msglen) {
1596                 warnx("message length mismatch, in packet %d, returned %d",
1597                       rtm->rtm_msglen, msglen);
1598         }
1599         if (rtm->rtm_errno != 0)  {
1600                 errno = rtm->rtm_errno;
1601                 warn("message indicates error %d", errno);
1602                 return;
1603         }
1604         cp = ((char *)(rtm + 1));
1605         if (rtm->rtm_addrs)
1606                 for (i = 1; i != 0; i <<= 1)
1607                         if (i & rtm->rtm_addrs) {
1608                                 sa = (struct sockaddr *)cp;
1609                                 switch (i) {
1610                                 case RTA_DST:
1611                                         dst = sa;
1612                                         break;
1613                                 case RTA_GATEWAY:
1614                                         gate = sa;
1615                                         break;
1616                                 case RTA_NETMASK:
1617                                         mask = sa;
1618                                         break;
1619                                 case RTA_IFP:
1620                                         if (sa->sa_family == AF_LINK &&
1621                                            ((struct sockaddr_dl *)sa)->sdl_nlen)
1622                                                 ifp = (struct sockaddr_dl *)sa;
1623                                         break;
1624                                 }
1625                                 ADVANCE(cp, sa);
1626                         }
1627         if (dst != NULL && mask != NULL)
1628                 mask->sa_family = dst->sa_family;       /* XXX */
1629         if (dst != NULL)
1630                 printf("destination: %s\n", routename(dst));
1631         if (mask != NULL) {
1632                 int savenflag = nflag;
1633
1634                 nflag = 1;
1635                 printf("       mask: %s\n", routename(mask));
1636                 nflag = savenflag;
1637         }
1638         if (gate != NULL && rtm->rtm_flags & RTF_GATEWAY)
1639                 printf("    gateway: %s\n", routename(gate));
1640         if (ifp != NULL)
1641                 printf("  interface: %.*s\n",
1642                     ifp->sdl_nlen, ifp->sdl_data);
1643         printf("      flags: ");
1644         bprintf(stdout, rtm->rtm_flags, routeflags);
1645
1646 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1647 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1648
1649         printf("\n%s\n", "\
1650  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire");
1651         printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1652         printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1653         printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1654         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1655         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rttvar), lock(RTTVAR));
1656         printf("%8ld%c ", rtm->rtm_rmx.rmx_hopcount, lock(HOPCOUNT));
1657         printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1658         if (rtm->rtm_rmx.rmx_expire != 0)
1659                 rtm->rtm_rmx.rmx_expire -= time(0);
1660         printf("%8ld%c\n", rtm->rtm_rmx.rmx_expire, lock(EXPIRE));
1661 #undef lock
1662 #undef msec
1663 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1664         if (verbose)
1665                 pmsg_common(rtm);
1666         else if (rtm->rtm_addrs &~ RTA_IGN) {
1667                 printf("sockaddrs: ");
1668                 bprintf(stdout, rtm->rtm_addrs, addrnames);
1669                 putchar('\n');
1670         }
1671 #undef  RTA_IGN
1672 }
1673
1674 static void
1675 pmsg_common(struct rt_msghdr *rtm)
1676 {
1677         printf("\nlocks: ");
1678         bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames);
1679         printf(" inits: ");
1680         bprintf(stdout, rtm->rtm_inits, metricnames);
1681         pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs);
1682 }
1683
1684 static void
1685 pmsg_addrs(char *cp, int addrs)
1686 {
1687         struct sockaddr *sa;
1688         int i;
1689
1690         if (addrs == 0) {
1691                 putchar('\n');
1692                 return;
1693         }
1694         printf("\nsockaddrs: ");
1695         bprintf(stdout, addrs, addrnames);
1696         putchar('\n');
1697         for (i = 1; i != 0; i <<= 1)
1698                 if (i & addrs) {
1699                         sa = (struct sockaddr *)cp;
1700                         printf(" %s", routename(sa));
1701                         ADVANCE(cp, sa);
1702                 }
1703         putchar('\n');
1704         fflush(stdout);
1705 }
1706
1707 static void
1708 bprintf(FILE *fp, int b, u_char *str)
1709 {
1710         int i;
1711         int gotsome = 0;
1712
1713         if (b == 0)
1714                 return;
1715         while ((i = *str++) != 0) {
1716                 if (b & (1 << (i-1))) {
1717                         if (!gotsome)
1718                                 i = '<';
1719                         else
1720                                 i = ',';
1721                         putc(i, fp);
1722                         gotsome = 1;
1723                         for (; (i = *str) > 32; str++)
1724                                 putc(i, fp);
1725                 } else
1726                         while (*str > 32)
1727                                 str++;
1728         }
1729         if (gotsome)
1730                 putc('>', fp);
1731 }
1732
1733 int
1734 keyword(const char *cp)
1735 {
1736         struct keytab *kt = keywords;
1737
1738         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1739                 kt++;
1740         return(kt->kt_i);
1741 }
1742
1743 static void
1744 sodump(sup su, const char *which)
1745 {
1746         switch (su->sa.sa_family) {
1747         case AF_LINK:
1748                 printf("%s: link %s; ",
1749                     which, link_ntoa(&su->sdl));
1750                 break;
1751         case AF_INET:
1752                 printf("%s: inet %s; ",
1753                     which, inet_ntoa(su->sin.sin_addr));
1754                 break;
1755         case AF_APPLETALK:
1756                 printf("%s: atalk %s; ",
1757                     which, atalk_ntoa(su->sat.sat_addr));
1758                 break;
1759 #ifdef NS
1760         case AF_NS:
1761                 printf("%s: xns %s; ",
1762                     which, ns_ntoa(su->sns.sns_addr));
1763                 break;
1764 #endif
1765         }
1766         fflush(stdout);
1767 }
1768
1769 /* States*/
1770 #define VIRGIN  0
1771 #define GOTONE  1
1772 #define GOTTWO  2
1773 /* Inputs */
1774 #define DIGIT   (4*0)
1775 #define END     (4*1)
1776 #define DELIM   (4*2)
1777
1778 static void
1779 sockaddr(char *addr, struct sockaddr *sa)
1780 {
1781         char *cp = (char *)sa;
1782         int size = sa->sa_len;
1783         char *cplim = cp + size;
1784         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1785
1786         memset(cp, 0, size);
1787         cp++;
1788         do {
1789                 if ((*addr >= '0') && (*addr <= '9')) {
1790                         new = *addr - '0';
1791                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1792                         new = *addr - 'a' + 10;
1793                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1794                         new = *addr - 'A' + 10;
1795                 } else if (*addr == '\0')
1796                         state |= END;
1797                 else
1798                         state |= DELIM;
1799                 addr++;
1800                 switch (state /* | INPUT */) {
1801                 case GOTTWO | DIGIT:
1802                         *cp++ = byte; /*FALLTHROUGH*/
1803                 case VIRGIN | DIGIT:
1804                         state = GOTONE; byte = new; continue;
1805                 case GOTONE | DIGIT:
1806                         state = GOTTWO; byte = new + (byte << 4); continue;
1807                 default: /* | DELIM */
1808                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1809                 case GOTONE | END:
1810                 case GOTTWO | END:
1811                         *cp++ = byte; /* FALLTHROUGH */
1812                 case VIRGIN | END:
1813                         break;
1814                 }
1815                 break;
1816         } while (cp < cplim);
1817         sa->sa_len = cp - (char *)sa;
1818 }
1819
1820 static int
1821 atalk_aton(const char *text, struct at_addr *addr)
1822 {
1823         u_int net, node;
1824
1825         if (sscanf(text, "%u.%u", &net, &node) != 2
1826             || net > 0xffff || node > 0xff)
1827                 return(0);
1828         addr->s_net = htons(net);
1829         addr->s_node = node;
1830         return(1);
1831 }
1832
1833 static char *
1834 atalk_ntoa(struct at_addr at)
1835 {
1836         static char buf[20];
1837
1838         snprintf(buf, sizeof(buf), "%u.%u", ntohs(at.s_net), at.s_node);
1839         return(buf);
1840 }