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((char *)&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 == 0)
 919                 mask = addr = 0;
 920         else {
 921                 if (net <= 0xff)
 922                         addr = net << 24;
 923                 else if (net <= 0xffff)
 924                         addr = net << 16;
 925                 else if (net <= 0xffffff)
 926                         addr = net << 8;
 927                 else
 928                         addr = net;
 929
 930                 if (bits)
 931                         mask = 0xffffffff << (32 - bits);
 932                 else {
 933                         if (IN_CLASSA(addr)) {
 934                                 mask = IN_CLASSA_NET;
 935                         } else if (IN_CLASSB(addr)) {
 936                                 mask = IN_CLASSB_NET;
 937                         } else if (IN_CLASSC(addr)) {
 938                                 mask = IN_CLASSC_NET;
 939                         } else
 940                                 mask = 0xffffffff;
 941                 }
 942                 addr &= mask;
 943         }
 944         in->sin_addr.s_addr = htonl(addr);
 945         in = &so_mask.sin;
 946         in->sin_addr.s_addr = htonl(mask);
 947         in->sin_len = 0;
 948         in->sin_family = 0;
 949         cp = (char *)(&in->sin_addr + 1);
 950         while (*--cp == 0 && cp > (char *)in)
 951                 ;
 952         in->sin_len = 1 + cp - (char *)in;
 953 }
 954
 955 #ifdef INET6
 956 /*
 957  * XXX the function may need more improvement...
 958  */
 959 static int
 960 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
 961 {
 962         struct in6_addr in6;
 963
 964         if (plen == NULL) {
 965                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
 966                     sin6->sin6_scope_id == 0) {
 967                         plen = "0";
 968                 } else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
 969                         /* aggregatable global unicast - RFC2374 */
 970                         memset(&in6, 0, sizeof(in6));
 971                         if (memcmp(&sin6->sin6_addr.s6_addr[8],
 972                                    &in6.s6_addr[8], 8) == 0)
 973                                 plen = "64";
 974                 }
 975         }
 976
 977         if (plen == NULL || strcmp(plen, "128") == 0)
 978                 return(1);
 979         rtm_addrs |= RTA_NETMASK;
 980         prefixlen(plen);
 981         return(0);
 982 }
 983 #endif
 984
 985 /*
 986  * Interpret an argument as a network address of some kind,
 987  * returning 1 if a host address, 0 if a network address.
 988  */
 989 static int
 990 getaddr(int which, char *str, struct hostent **hpp)
 991 {
 992         sup su;
 993         struct hostent *hp;
 994         struct netent *np;
 995         u_long val;
 996         char *q;
 997         int afamily;  /* local copy of af so we can change it */
 998
 999         if (af == 0) {
1000                 af = AF_INET;
1001                 aflen = sizeof(struct sockaddr_in);
1002         }
1003         afamily = af;
1004         rtm_addrs |= which;
1005         switch (which) {
1006         case RTA_DST:
1007                 su = &so_dst;
1008                 break;
1009         case RTA_GATEWAY:
1010                 su = &so_gate;
1011                 if (iflag) {
1012                         struct ifaddrs *ifap, *ifa;
1013                         struct sockaddr_dl *sdl = NULL;
1014
1015                         if (getifaddrs(&ifap))
1016                                 err(1, "getifaddrs");
1017
1018                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
1019                                 if (ifa->ifa_addr->sa_family != AF_LINK)
1020                                         continue;
1021
1022                                 if (strcmp(str, ifa->ifa_name) != 0)
1023                                         continue;
1024
1025                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1026                         }
1027                         /* If we found it, then use it */
1028                         if (sdl != NULL) {
1029                                 /*
1030                                  * Copy is safe since we have a
1031                                  * sockaddr_storage member in sockunion{}.
1032                                  * Note that we need to copy before calling
1033                                  * freeifaddrs().
1034                                  *
1035                                  * Interface routes are routed only by their
1036                                  * sdl_index or interface name (we provide
1037                                  * both here), not by the ARP address of the
1038                                  * local interface (alen, slen = 0).
1039                                  */
1040                                 memcpy(&su->sdl, sdl, sdl->sdl_len);
1041                                 su->sdl.sdl_alen = 0;
1042                                 su->sdl.sdl_slen = 0;
1043                         }
1044                         freeifaddrs(ifap);
1045                         if (sdl != NULL)
1046                                 return(1);
1047                 }
1048                 break;
1049         case RTA_NETMASK:
1050                 su = &so_mask;
1051                 break;
1052         case RTA_GENMASK:
1053                 su = &so_genmask;
1054                 break;
1055         case RTA_IFP:
1056                 su = &so_ifp;
1057                 afamily = AF_LINK;
1058                 break;
1059         case RTA_IFA:
1060                 su = &so_ifa;
1061                 break;
1062         case RTA_MPLS1:
1063                 su = &so_mpls1;
1064                 break;
1065         case RTA_MPLS2:
1066                 su = &so_mpls2;
1067                 break;
1068         case RTA_MPLS3:
1069                 su = &so_mpls3;
1070                 break;
1071         default:
1072                 usage("internal error");
1073                 /*NOTREACHED*/
1074         }
1075         su->sa.sa_len = aflen;
1076         su->sa.sa_family = afamily; /* cases that don't want it have left
1077                                        already */
1078         if (strcmp(str, "default") == 0) {
1079                 /*
1080                  * Default is net 0.0.0.0/0
1081                  */
1082                 switch (which) {
1083                 case RTA_DST:
1084                         forcenet++;
1085                         /* bzero(su, sizeof(*su)); *//* for readability */
1086                         getaddr(RTA_NETMASK, str, 0);
1087                         break;
1088                 case RTA_NETMASK:
1089                 case RTA_GENMASK:
1090                         /* bzero(su, sizeof(*su)); *//* for readability */
1091                         break;
1092                 }
1093                 return(0);
1094         }
1095         switch (afamily) {
1096 #ifdef INET6
1097         case AF_INET6:
1098         {
1099                 struct addrinfo hints, *res;
1100
1101                 q = NULL;
1102                 if (which == RTA_DST && (q = strchr(str, '/')) != NULL)
1103                         *q = '\0';
1104                 memset(&hints, 0, sizeof(hints));
1105                 hints.ai_family = afamily;      /*AF_INET6*/
1106                 hints.ai_flags = AI_NUMERICHOST;
1107                 hints.ai_socktype = SOCK_DGRAM;         /*dummy*/
1108                 if (getaddrinfo(str, "0", &hints, &res) != 0 ||
1109                     res->ai_family != AF_INET6 ||
1110                     res->ai_addrlen != sizeof(su->sin6)) {
1111                         fprintf(stderr, "%s: bad value\n", str);
1112                         exit(1);
1113                 }
1114                 memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6));
1115 #ifdef __KAME__
1116                 if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) ||
1117                      IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr)) &&
1118                     su->sin6.sin6_scope_id) {
1119                         *(u_int16_t *)&su->sin6.sin6_addr.s6_addr[2] =
1120                                 htons(su->sin6.sin6_scope_id);
1121                         su->sin6.sin6_scope_id = 0;
1122                 }
1123 #endif
1124                 freeaddrinfo(res);
1125                 if (q != NULL)
1126                         *q++ = '/';
1127                 if (which == RTA_DST)
1128                         return(inet6_makenetandmask(&su->sin6, q));
1129                 return(0);
1130         }
1131 #endif /* INET6 */
1132
1133 #ifdef NS
1134         case AF_NS:
1135                 if (which == RTA_DST) {
1136                         struct sockaddr_ns *sms = &(so_mask.sns);
1137                         memset(sms, 0, sizeof(*sms));
1138                         sms->sns_family = 0;
1139                         sms->sns_len = 6;
1140                         sms->sns_addr.x_net = *(union ns_net *)ns_bh;
1141                         rtm_addrs |= RTA_NETMASK;
1142                 }
1143                 su->sns.sns_addr = ns_addr(str);
1144                 return(!ns_nullhost(su->sns.sns_addr));
1145 #endif
1146
1147         case AF_APPLETALK:
1148                 if (!atalk_aton(str, &su->sat.sat_addr))
1149                         errx(EX_NOHOST, "bad address: %s", str);
1150                 rtm_addrs |= RTA_NETMASK;
1151                 return(forcehost || su->sat.sat_addr.s_node != 0);
1152
1153         case AF_LINK:
1154                 link_addr(str, &su->sdl);
1155                 return(1);
1156
1157         case PF_ROUTE:
1158                 su->sa.sa_len = sizeof(*su);
1159                 sockaddr(str, &su->sa);
1160                 return(1);
1161
1162         case AF_MPLS:
1163         {
1164                 mpls_label_t label;
1165
1166                 bzero(su, sizeof(*su));
1167                 su->sa.sa_len = sizeof(*su);
1168                 su->sa.sa_family = AF_MPLS;
1169                 su->smpls.smpls_op = mplsop;
1170                 if (mplsop != MPLSLOP_POP && mplsop != MPLSLOP_POPALL &&
1171                     *str != '\0') {
1172                         if (sscanf(str, "%u", &label) != 1)
1173                                 errx(EX_NOHOST, "bad address: %s", str);
1174                         su->smpls.smpls_label = htonl(label);
1175                 }
1176                 return(1);
1177         }
1178
1179         case AF_INET:
1180         default:
1181                 break;
1182         }
1183
1184         if (hpp == NULL)
1185                 hpp = &hp;
1186         *hpp = NULL;
1187
1188         q = strchr(str,'/');
1189         if (q != NULL && which == RTA_DST) {
1190                 *q = '\0';
1191                 if ((val = inet_network(str)) != INADDR_NONE) {
1192                         inet_makenetandmask(
1193                                 val, &su->sin, strtoul(q+1, 0, 0));
1194                         return(0);
1195                 }
1196                 *q = '/';
1197         }
1198         if ((which != RTA_DST || forcenet == 0) &&
1199             inet_aton(str, &su->sin.sin_addr)) {
1200                 val = su->sin.sin_addr.s_addr;
1201                 if (which != RTA_DST ||
1202                     inet_lnaof(su->sin.sin_addr) != INADDR_ANY)
1203                         return(1);
1204                 else {
1205                         val = ntohl(val);
1206                         goto netdone;
1207                 }
1208         }
1209         if (which == RTA_DST && forcehost == 0 &&
1210             ((val = inet_network(str)) != INADDR_NONE ||
1211             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1212 netdone:
1213                 inet_makenetandmask(val, &su->sin, 0);
1214                 return(0);
1215         }
1216         hp = gethostbyname(str);
1217         if (hp != NULL) {
1218                 *hpp = hp;
1219                 su->sin.sin_family = hp->h_addrtype;
1220                 memmove((char *)&su->sin.sin_addr, hp->h_addr,
1221                     MIN((size_t)hp->h_length, sizeof(su->sin.sin_addr)));
1222                 return(1);
1223         }
1224         errx(EX_NOHOST, "bad address: %s", str);
1225 }
1226
1227 static int
1228 prefixlen(const char *len_str)
1229 {
1230         int len = atoi(len_str), q, r;
1231         int max;
1232         char *p;
1233
1234         rtm_addrs |= RTA_NETMASK;
1235         switch (af) {
1236 #ifdef INET6
1237         case AF_INET6:
1238                 max = 128;
1239                 p = (char *)&so_mask.sin6.sin6_addr;
1240                 break;
1241 #endif
1242         case AF_INET:
1243                 max = 32;
1244                 p = (char *)&so_mask.sin.sin_addr;
1245                 break;
1246         default:
1247                 fprintf(stderr, "prefixlen not supported in this af\n");
1248                 exit(1);
1249                 /*NOTREACHED*/
1250         }
1251
1252         if (len < 0 || max < len) {
1253                 fprintf(stderr, "%s: bad value\n", len_str);
1254                 exit(1);
1255         }
1256
1257         q = len >> 3;
1258         r = len & 7;
1259         so_mask.sa.sa_family = af;
1260         so_mask.sa.sa_len = aflen;
1261         memset((void *)p, 0, max / 8);
1262         if (q > 0)
1263                 memset((void *)p, 0xff, q);
1264         if (r > 0)
1265                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1266         if (len == max)
1267                 return(-1);
1268         else
1269                 return(len);
1270 }
1271
1272 #ifdef NS
1273 short ns_nullh[] = {0,0,0};
1274
1275 char *
1276 ns_print(struct sockaddr_ns *sns)
1277 {
1278         struct ns_addr work;
1279         union { union ns_net net_e; u_long long_e; } net;
1280         u_short port;
1281         static char mybuf[50+MAXHOSTNAMELEN], cport[10], chost[25];
1282         const char *host = "";
1283         char *p;
1284         u_char *q;
1285
1286         work = sns->sns_addr;
1287         port = ntohs(work.x_port);
1288         work.x_port = 0;
1289         net.net_e  = work.x_net;
1290         if (ns_nullhost(work) && net.long_e == 0) {
1291                 if (port == 0)
1292                         strncpy(mybuf, "*.*", sizeof(mybuf));
1293                 else
1294                         sprintf(mybuf, "*.%XH", port);
1295                 return(mybuf);
1296         }
1297
1298         if (memcmp(ns_bh, work.x_host.c_host, 6) == 0)
1299                 host = "any";
1300         else if (memcmp(ns_nullh, work.x_host.c_host, 6) == 0)
1301                 host = "*";
1302         else {
1303                 q = work.x_host.c_host;
1304                 sprintf(chost, "%02X%02X%02X%02X%02X%02XH",
1305                         q[0], q[1], q[2], q[3], q[4], q[5]);
1306                 for (p = chost; *p == '0' && p < chost + 12; p++)
1307                         /* void */;
1308                 host = p;
1309         }
1310         if (port != 0)
1311                 sprintf(cport, ".%XH", htons(port));
1312         else
1313                 *cport = 0;
1314
1315         snprintf(mybuf, sizeof(mybuf), "%lxH.%s%s",
1316                         (unsigned long)ntohl(net.long_e),
1317                         host, cport);
1318         return(mybuf);
1319 }
1320 #endif
1321
1322 static void
1323 interfaces(void)
1324 {
1325         size_t needed;
1326         int mib[6];
1327         char *buf, *lim, *next;
1328         struct rt_msghdr *rtm;
1329
1330         mib[0] = CTL_NET;
1331         mib[1] = PF_ROUTE;
1332         mib[2] = 0;             /* protocol */
1333         mib[3] = 0;             /* wildcard address family */
1334         mib[4] = NET_RT_IFLIST;
1335         mib[5] = 0;             /* no flags */
1336         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
1337                 err(EX_OSERR, "route-sysctl-estimate");
1338         if ((buf = malloc(needed)) == NULL)
1339                 errx(EX_OSERR, "malloc failed");
1340         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
1341                 err(EX_OSERR, "actual retrieval of interface table");
1342         lim = buf + needed;
1343         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1344                 rtm = (struct rt_msghdr *)next;
1345                 print_rtmsg(rtm, rtm->rtm_msglen);
1346         }
1347 }
1348
1349 static void
1350 monitor(void)
1351 {
1352         int n;
1353         char msg[2048];
1354
1355         verbose = 1;
1356         if (debugonly) {
1357                 interfaces();
1358                 exit(0);
1359         }
1360         for (;;) {
1361                 time_t now;
1362                 n = read(s, msg, 2048);
1363                 now = time(NULL);
1364                 printf("\ngot message of size %d on %s", n, ctime(&now));
1365                 print_rtmsg((struct rt_msghdr *)msg, n);
1366         }
1367 }
1368
1369 struct {
1370         struct  rt_msghdr m_rtm;
1371         char    m_space[512];
1372 } m_rtmsg;
1373
1374 static int
1375 rtmsg(int cmd, int flags)
1376 {
1377         static int seq;
1378         int rlen;
1379         char *cp = m_rtmsg.m_space;
1380         int l;
1381
1382 #define NEXTADDR(w, u) \
1383         if (rtm_addrs & (w)) {\
1384             l = ROUNDUP(u.sa.sa_len); memmove(cp, &(u), l); cp += l;\
1385             if (verbose) sodump(&(u),"u");\
1386         }
1387
1388         errno = 0;
1389         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1390         if (cmd == 'a')
1391                 cmd = RTM_ADD;
1392         else if (cmd == 'c')
1393                 cmd = RTM_CHANGE;
1394         else if (cmd == 'g') {
1395                 cmd = RTM_GET;
1396                 if (so_ifp.sa.sa_family == 0) {
1397                         so_ifp.sa.sa_family = AF_LINK;
1398                         so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
1399                         rtm_addrs |= RTA_IFP;
1400                 }
1401         } else
1402                 cmd = RTM_DELETE;
1403 #define rtm m_rtmsg.m_rtm
1404         rtm.rtm_type = cmd;
1405         rtm.rtm_flags = flags;
1406         rtm.rtm_version = RTM_VERSION;
1407         rtm.rtm_seq = ++seq;
1408         rtm.rtm_addrs = rtm_addrs;
1409         rtm.rtm_rmx = rt_metrics;
1410         rtm.rtm_inits = rtm_inits;
1411
1412         if (rtm_addrs & RTA_NETMASK)
1413                 mask_addr();
1414         NEXTADDR(RTA_DST, so_dst);
1415         NEXTADDR(RTA_GATEWAY, so_gate);
1416         NEXTADDR(RTA_NETMASK, so_mask);
1417         NEXTADDR(RTA_GENMASK, so_genmask);
1418         NEXTADDR(RTA_IFP, so_ifp);
1419         NEXTADDR(RTA_IFA, so_ifa);
1420         NEXTADDR(RTA_MPLS1, so_mpls1);
1421         NEXTADDR(RTA_MPLS2, so_mpls2);
1422         NEXTADDR(RTA_MPLS3, so_mpls3);
1423         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1424         if (verbose)
1425                 print_rtmsg(&rtm, l);
1426         if (debugonly)
1427                 return(0);
1428         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1429                 warn("writing to routing socket");
1430                 return(-1);
1431         }
1432         if (cmd == RTM_GET) {
1433                 do {
1434                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1435                 } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
1436                 if (l < 0)
1437                         warn("read from routing socket");
1438                 else
1439                         print_getmsg(&rtm, l);
1440         }
1441 #undef rtm
1442         return(0);
1443 }
1444
1445 static void
1446 mask_addr(void)
1447 {
1448         int olen = so_mask.sa.sa_len;
1449         char *cp1 = olen + (char *)&so_mask, *cp2;
1450
1451         for (so_mask.sa.sa_len = 0; cp1 > (char *)&so_mask; )
1452                 if (*--cp1 != 0) {
1453                         so_mask.sa.sa_len = 1 + cp1 - (char *)&so_mask;
1454                         break;
1455                 }
1456         if ((rtm_addrs & RTA_DST) == 0)
1457                 return;
1458         switch (so_dst.sa.sa_family) {
1459 #ifdef NS
1460         case AF_NS:
1461 #endif
1462         case AF_INET:
1463 #ifdef INET6
1464         case AF_INET6:
1465 #endif
1466         case AF_APPLETALK:
1467         case 0:
1468                 return;
1469         }
1470         cp1 = so_mask.sa.sa_len + 1 + (char *)&so_dst;
1471         cp2 = so_dst.sa.sa_len + 1 + (char *)&so_dst;
1472         while (cp2 > cp1)
1473                 *--cp2 = 0;
1474         cp2 = so_mask.sa.sa_len + 1 + (char *)&so_mask;
1475         while (cp1 > so_dst.sa.sa_data)
1476                 *--cp1 &= *--cp2;
1477 }
1478
1479 const char *msgtypes[] = {
1480         "",
1481         "RTM_ADD: Add Route",
1482         "RTM_DELETE: Delete Route",
1483         "RTM_CHANGE: Change Metrics or flags",
1484         "RTM_GET: Report Metrics",
1485         "RTM_LOSING: Kernel Suspects Partitioning",
1486         "RTM_REDIRECT: Told to use different route",
1487         "RTM_MISS: Lookup failed on this address",
1488         "RTM_LOCK: fix specified metrics",
1489         "RTM_OLDADD: caused by SIOCADDRT",
1490         "RTM_OLDDEL: caused by SIOCDELRT",
1491         "RTM_RESOLVE: Route created by cloning",
1492         "RTM_NEWADDR: address being added to iface",
1493         "RTM_DELADDR: address being removed from iface",
1494         "RTM_IFINFO: iface status change",
1495         "RTM_NEWMADDR: new multicast group membership on iface",
1496         "RTM_DELMADDR: multicast group membership removed from iface",
1497         "RTM_IFANNOUNCE: interface arrival/departure",
1498         0,
1499 };
1500
1501 char metricnames[] =
1502 "\011pksent\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire\2hopcount"
1503 "\1mtu";
1504 char routeflags[] =
1505 "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE\010MASK_PRESENT"
1506 "\011CLONING\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE\016b016"
1507 "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3\024CHAINDELETE"
1508 "\025PINNED\026LOCAL\027BROADCAST\030MULTICAST";
1509 char ifnetflags[] =
1510 "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1511 "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1512 "\017LINK2\020MULTICAST";
1513 char addrnames[] =
1514 "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD"
1515 "\011MPLS1\012MPLS2\013MPLS3";
1516
1517 static void
1518 print_rtmsg(struct rt_msghdr *rtm, int msglen __unused)
1519 {
1520         struct if_msghdr *ifm;
1521         struct ifa_msghdr *ifam;
1522 #ifdef RTM_NEWMADDR
1523         struct ifma_msghdr *ifmam;
1524 #endif
1525         struct if_announcemsghdr *ifan;
1526
1527         if (verbose == 0)
1528                 return;
1529         if (rtm->rtm_version != RTM_VERSION) {
1530                 printf("routing message version %d not understood\n",
1531                     rtm->rtm_version);
1532                 return;
1533         }
1534         if (msgtypes[rtm->rtm_type] != NULL)
1535                 printf("%s: ", msgtypes[rtm->rtm_type]);
1536         else
1537                 printf("#%d: ", rtm->rtm_type);
1538         printf("len %d, ", rtm->rtm_msglen);
1539         switch (rtm->rtm_type) {
1540         case RTM_IFINFO:
1541                 ifm = (struct if_msghdr *)rtm;
1542                 printf("if# %d, flags:", ifm->ifm_index);
1543                 bprintf(stdout, ifm->ifm_flags, ifnetflags);
1544                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs);
1545                 break;
1546         case RTM_NEWADDR:
1547         case RTM_DELADDR:
1548                 ifam = (struct ifa_msghdr *)rtm;
1549                 printf("metric %d, flags:", ifam->ifam_metric);
1550                 bprintf(stdout, ifam->ifam_flags, routeflags);
1551                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs);
1552                 break;
1553 #ifdef RTM_NEWMADDR
1554         case RTM_NEWMADDR:
1555         case RTM_DELMADDR:
1556                 ifmam = (struct ifma_msghdr *)rtm;
1557                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs);
1558                 break;
1559 #endif
1560         case RTM_IFANNOUNCE:
1561                 ifan = (struct if_announcemsghdr *)rtm;
1562                 printf("if# %d, what: ", ifan->ifan_index);
1563                 switch (ifan->ifan_what) {
1564                 case IFAN_ARRIVAL:
1565                         printf("arrival");
1566                         break;
1567                 case IFAN_DEPARTURE:
1568                         printf("departure");
1569                         break;
1570                 default:
1571                         printf("#%d", ifan->ifan_what);
1572                         break;
1573                 }
1574                 printf("\n");
1575                 break;
1576
1577         default:
1578                 printf("pid: %ld, seq %d, errno %d, flags:",
1579                         (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1580                 bprintf(stdout, rtm->rtm_flags, routeflags);
1581                 pmsg_common(rtm);
1582         }
1583 }
1584
1585 static void
1586 print_getmsg(struct rt_msghdr *rtm, int msglen)
1587 {
1588         struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
1589         struct sockaddr_dl *ifp = NULL;
1590         struct sockaddr *sa;
1591         char *cp;
1592         int i;
1593
1594         printf("   route to: %s\n", routename(&so_dst.sa));
1595         if (rtm->rtm_version != RTM_VERSION) {
1596                 warnx("routing message version %d not understood",
1597                      rtm->rtm_version);
1598                 return;
1599         }
1600         if (rtm->rtm_msglen > msglen) {
1601                 warnx("message length mismatch, in packet %d, returned %d",
1602                       rtm->rtm_msglen, msglen);
1603         }
1604         if (rtm->rtm_errno != 0)  {
1605                 errno = rtm->rtm_errno;
1606                 warn("message indicates error %d", errno);
1607                 return;
1608         }
1609         cp = ((char *)(rtm + 1));
1610         if (rtm->rtm_addrs)
1611                 for (i = 1; i != 0; i <<= 1)
1612                         if (i & rtm->rtm_addrs) {
1613                                 sa = (struct sockaddr *)cp;
1614                                 switch (i) {
1615                                 case RTA_DST:
1616                                         dst = sa;
1617                                         break;
1618                                 case RTA_GATEWAY:
1619                                         gate = sa;
1620                                         break;
1621                                 case RTA_NETMASK:
1622                                         mask = sa;
1623                                         break;
1624                                 case RTA_IFP:
1625                                         if (sa->sa_family == AF_LINK &&
1626                                            ((struct sockaddr_dl *)sa)->sdl_nlen)
1627                                                 ifp = (struct sockaddr_dl *)sa;
1628                                         break;
1629                                 }
1630                                 ADVANCE(cp, sa);
1631                         }
1632         if (dst != NULL && mask != NULL)
1633                 mask->sa_family = dst->sa_family;       /* XXX */
1634         if (dst != NULL)
1635                 printf("destination: %s\n", routename(dst));
1636         if (mask != NULL) {
1637                 int savenflag = nflag;
1638
1639                 nflag = 1;
1640                 printf("       mask: %s\n", routename(mask));
1641                 nflag = savenflag;
1642         }
1643         if (gate != NULL && rtm->rtm_flags & RTF_GATEWAY)
1644                 printf("    gateway: %s\n", routename(gate));
1645         if (ifp != NULL)
1646                 printf("  interface: %.*s\n",
1647                     ifp->sdl_nlen, ifp->sdl_data);
1648         printf("      flags: ");
1649         bprintf(stdout, rtm->rtm_flags, routeflags);
1650
1651 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1652 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1653
1654         printf("\n%s\n", "\
1655  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire");
1656         printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1657         printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1658         printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1659         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1660         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rttvar), lock(RTTVAR));
1661         printf("%8ld%c ", rtm->rtm_rmx.rmx_hopcount, lock(HOPCOUNT));
1662         printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1663         if (rtm->rtm_rmx.rmx_expire != 0)
1664                 rtm->rtm_rmx.rmx_expire -= time(0);
1665         printf("%8ld%c\n", rtm->rtm_rmx.rmx_expire, lock(EXPIRE));
1666 #undef lock
1667 #undef msec
1668 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1669         if (verbose)
1670                 pmsg_common(rtm);
1671         else if (rtm->rtm_addrs &~ RTA_IGN) {
1672                 printf("sockaddrs: ");
1673                 bprintf(stdout, rtm->rtm_addrs, addrnames);
1674                 putchar('\n');
1675         }
1676 #undef  RTA_IGN
1677 }
1678
1679 static void
1680 pmsg_common(struct rt_msghdr *rtm)
1681 {
1682         printf("\nlocks: ");
1683         bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames);
1684         printf(" inits: ");
1685         bprintf(stdout, rtm->rtm_inits, metricnames);
1686         pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs);
1687 }
1688
1689 static void
1690 pmsg_addrs(char *cp, int addrs)
1691 {
1692         struct sockaddr *sa;
1693         int i;
1694
1695         if (addrs == 0) {
1696                 putchar('\n');
1697                 return;
1698         }
1699         printf("\nsockaddrs: ");
1700         bprintf(stdout, addrs, addrnames);
1701         putchar('\n');
1702         for (i = 1; i != 0; i <<= 1)
1703                 if (i & addrs) {
1704                         sa = (struct sockaddr *)cp;
1705                         printf(" %s", routename(sa));
1706                         ADVANCE(cp, sa);
1707                 }
1708         putchar('\n');
1709         fflush(stdout);
1710 }
1711
1712 static void
1713 bprintf(FILE *fp, int b, u_char *str)
1714 {
1715         int i;
1716         int gotsome = 0;
1717
1718         if (b == 0)
1719                 return;
1720         while ((i = *str++) != 0) {
1721                 if (b & (1 << (i-1))) {
1722                         if (!gotsome)
1723                                 i = '<';
1724                         else
1725                                 i = ',';
1726                         putc(i, fp);
1727                         gotsome = 1;
1728                         for (; (i = *str) > 32; str++)
1729                                 putc(i, fp);
1730                 } else
1731                         while (*str > 32)
1732                                 str++;
1733         }
1734         if (gotsome)
1735                 putc('>', fp);
1736 }
1737
1738 int
1739 keyword(const char *cp)
1740 {
1741         struct keytab *kt = keywords;
1742
1743         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1744                 kt++;
1745         return(kt->kt_i);
1746 }
1747
1748 static void
1749 sodump(sup su, const char *which)
1750 {
1751         switch (su->sa.sa_family) {
1752         case AF_LINK:
1753                 printf("%s: link %s; ",
1754                     which, link_ntoa(&su->sdl));
1755                 break;
1756         case AF_INET:
1757                 printf("%s: inet %s; ",
1758                     which, inet_ntoa(su->sin.sin_addr));
1759                 break;
1760         case AF_APPLETALK:
1761                 printf("%s: atalk %s; ",
1762                     which, atalk_ntoa(su->sat.sat_addr));
1763                 break;
1764 #ifdef NS
1765         case AF_NS:
1766                 printf("%s: xns %s; ",
1767                     which, ns_ntoa(su->sns.sns_addr));
1768                 break;
1769 #endif
1770         }
1771         fflush(stdout);
1772 }
1773
1774 /* States*/
1775 #define VIRGIN  0
1776 #define GOTONE  1
1777 #define GOTTWO  2
1778 /* Inputs */
1779 #define DIGIT   (4*0)
1780 #define END     (4*1)
1781 #define DELIM   (4*2)
1782
1783 static void
1784 sockaddr(char *addr, struct sockaddr *sa)
1785 {
1786         char *cp = (char *)sa;
1787         int size = sa->sa_len;
1788         char *cplim = cp + size;
1789         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1790
1791         memset(cp, 0, size);
1792         cp++;
1793         do {
1794                 if ((*addr >= '0') && (*addr <= '9')) {
1795                         new = *addr - '0';
1796                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1797                         new = *addr - 'a' + 10;
1798                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1799                         new = *addr - 'A' + 10;
1800                 } else if (*addr == '\0')
1801                         state |= END;
1802                 else
1803                         state |= DELIM;
1804                 addr++;
1805                 switch (state /* | INPUT */) {
1806                 case GOTTWO | DIGIT:
1807                         *cp++ = byte; /*FALLTHROUGH*/
1808                 case VIRGIN | DIGIT:
1809                         state = GOTONE; byte = new; continue;
1810                 case GOTONE | DIGIT:
1811                         state = GOTTWO; byte = new + (byte << 4); continue;
1812                 default: /* | DELIM */
1813                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1814                 case GOTONE | END:
1815                 case GOTTWO | END:
1816                         *cp++ = byte; /* FALLTHROUGH */
1817                 case VIRGIN | END:
1818                         break;
1819                 }
1820                 break;
1821         } while (cp < cplim);
1822         sa->sa_len = cp - (char *)sa;
1823 }
1824
1825 static int
1826 atalk_aton(const char *text, struct at_addr *addr)
1827 {
1828         u_int net, node;
1829
1830         if (sscanf(text, "%u.%u", &net, &node) != 2
1831             || net > 0xffff || node > 0xff)
1832                 return(0);
1833         addr->s_net = htons(net);
1834         addr->s_node = node;
1835         return(1);
1836 }
1837
1838 static char *
1839 atalk_ntoa(struct at_addr at)
1840 {
1841         static char buf[20];
1842
1843         snprintf(buf, sizeof(buf), "%u.%u", ntohs(at.s_net), at.s_node);
1844         return(buf);
1845 }