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 1.16 2007/09/10 15:13:55 dillon 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 <ctype.h>
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <paths.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <sysexits.h>
  66 #include <unistd.h>
  67 #include <ifaddrs.h>
  68
  69 #include "extern.h"
  70 #include "keywords.h"
  71
  72 union   sockunion {
  73         struct  sockaddr sa;
  74         struct  sockaddr_in sin;
  75 #ifdef INET6
  76         struct  sockaddr_in6 sin6;
  77 #endif
  78         struct  sockaddr_at sat;
  79 #ifdef NS
  80         struct  sockaddr_ns sns;
  81 #endif
  82         struct  sockaddr_dl sdl;
  83         struct  sockaddr_inarp sinarp;
  84         struct  sockaddr_storage ss; /* added to avoid memory overrun */
  85 } so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp;
  86
  87 typedef union sockunion *sup;
  88
  89 int     nflag, wflag;
  90 int     cpuflag = -1;
  91
  92 static struct ortentry route;
  93 static struct rt_metrics rt_metrics;
  94 static int      pid, rtm_addrs;
  95 static int      s;
  96 static int      forcehost, forcenet, af, qflag, tflag;
  97 static int      iflag, verbose, aflen = sizeof(struct sockaddr_in);
  98 static int      locking, lockrest, debugonly;
  99 static u_long   rtm_inits;
 100 static uid_t    uid;
 101 #ifdef NS
 102 static short    ns_bh[] = {-1,-1,-1};
 103 #endif
 104
 105 static int       atalk_aton(const char *, struct at_addr *);
 106 static char     *atalk_ntoa(struct at_addr);
 107 static void      flushroutes(int, char **);
 108 static void      set_metric(char *, int);
 109 static void      newroute(int, char **);
 110 static void      inet_makenetandmask(u_long, struct sockaddr_in *, u_long);
 111 static void      interfaces(void);
 112 static void      monitor(void);
 113 static void      sockaddr(char *, struct sockaddr *);
 114 static void      sodump(sup, const char *);
 115 static void      bprintf(FILE *, int, u_char *);
 116 static void      print_getmsg(struct rt_msghdr *, int);
 117 static void      print_rtmsg(struct rt_msghdr *, int);
 118 static void      pmsg_common(struct rt_msghdr *);
 119 static void      pmsg_addrs(char *, int);
 120 static void      mask_addr(void);
 121 static int       getaddr(int, char *, struct hostent **);
 122 static int       rtmsg(int, int);
 123 static int       prefixlen(const char *);
 124 #ifdef INET6
 125 static int       inet6_makenetandmask(struct sockaddr_in6 *, const char *);
 126 #endif
 127
 128 void
 129 usage(const char *cp)
 130 {
 131         if (cp != NULL)
 132                 warnx("bad keyword: %s", cp);
 133         fprintf(stderr, "usage: route [-dnqtv] command [[modifiers] args]\n");
 134         exit(EX_USAGE);
 135         /* NOTREACHED */
 136 }
 137
 138 #define ROUNDUP(a) \
 139         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
 140 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
 141
 142 int
 143 main(int argc, char **argv)
 144 {
 145         int ch;
 146
 147         if (argc < 2)
 148                 usage((char *)NULL);
 149
 150         while ((ch = getopt(argc, argv, "c:wnqdtv")) != -1)
 151                 switch(ch) {
 152                 case 'c':
 153                         cpuflag = strtol(optarg, NULL, 0);
 154                         break;
 155                 case 'w':
 156                         wflag = 1;
 157                         break;
 158                 case 'n':
 159                         nflag = 1;
 160                         break;
 161                 case 'q':
 162                         qflag = 1;
 163                         break;
 164                 case 'v':
 165                         verbose = 1;
 166                         break;
 167                 case 't':
 168                         tflag = 1;
 169                         break;
 170                 case 'd':
 171                         debugonly = 1;
 172                         break;
 173                 case '?':
 174                 default:
 175                         usage((char *)NULL);
 176                 }
 177         argc -= optind;
 178         argv += optind;
 179
 180         pid = getpid();
 181         uid = geteuid();
 182         if (tflag)
 183                 s = open(_PATH_DEVNULL, O_WRONLY, 0);
 184         else
 185                 s = socket(PF_ROUTE, SOCK_RAW, 0);
 186         if (s < 0)
 187                 err(EX_OSERR, "socket");
 188         if (*argv != NULL)
 189                 switch (keyword(*argv)) {
 190                 case K_GET:
 191                         uid = 0;
 192                         /* FALLTHROUGH */
 193
 194                 case K_CHANGE:
 195                 case K_ADD:
 196                 case K_DELETE:
 197                         newroute(argc, argv);
 198                         /* NOTREACHED */
 199
 200                 case K_SHOW:
 201                         show(argc, argv);
 202                         return(0);
 203
 204                 case K_MONITOR:
 205                         monitor();
 206                         /* NOTREACHED */
 207
 208                 case K_FLUSH:
 209                         flushroutes(argc, argv);
 210                         exit(0);
 211                         /* NOTREACHED */
 212                 }
 213         usage(*argv);
 214         /* NOTREACHED */
 215 }
 216
 217 /*
 218  * Purge all entries in the routing tables not
 219  * associated with network interfaces.
 220  */
 221 static void
 222 flushroutes(int argc, char **argv)
 223 {
 224         size_t needed;
 225         int mib[7], rlen, seqno;
 226         int miblen;
 227         char *buf, *next, *lim;
 228         struct rt_msghdr *rtm;
 229
 230         if (uid != 0) {
 231                 errx(EX_NOPERM, "must be root to alter routing table");
 232         }
 233         shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 234         if (argc > 1) {
 235                 argv++;
 236                 if (argc == 2 && **argv == '-')
 237                     switch (keyword(*argv + 1)) {
 238                         case K_INET:
 239                                 af = AF_INET;
 240                                 break;
 241 #ifdef INET6
 242                         case K_INET6:
 243                                 af = AF_INET6;
 244                                 break;
 245 #endif
 246                         case K_ATALK:
 247                                 af = AF_APPLETALK;
 248                                 break;
 249 #ifdef NS
 250                         case K_XNS:
 251                                 af = AF_NS;
 252                                 break;
 253 #endif
 254                         case K_LINK:
 255                                 af = AF_LINK;
 256                                 break;
 257                         default:
 258                                 goto bad;
 259                 } else
 260 bad:                    usage(*argv);
 261         }
 262         mib[0] = CTL_NET;
 263         mib[1] = PF_ROUTE;
 264         mib[2] = 0;             /* protocol */
 265         mib[3] = 0;             /* wildcard address family */
 266         mib[4] = NET_RT_DUMP;
 267         mib[5] = 0;             /* no flags */
 268         if (cpuflag >= 0) {
 269                 mib[6] = cpuflag;
 270                 miblen = 7;
 271         } else {
 272                 miblen = 6;
 273         }
 274         if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)
 275                 err(EX_OSERR, "route-sysctl-estimate");
 276         if ((buf = malloc(needed)) == NULL)
 277                 errx(EX_OSERR, "malloc failed");
 278         if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0)
 279                 err(EX_OSERR, "route-sysctl-get");
 280         lim = buf + needed;
 281         if (verbose)
 282                 printf("Examining routing table from sysctl\n");
 283         seqno = 0;              /* ??? */
 284         for (next = buf; next < lim; next += rtm->rtm_msglen) {
 285                 rtm = (struct rt_msghdr *)next;
 286                 if (verbose)
 287                         print_rtmsg(rtm, rtm->rtm_msglen);
 288                 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
 289                         continue;
 290                 if (af != 0) {
 291                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 292
 293                         if (sa->sa_family != af)
 294                                 continue;
 295                 }
 296                 if (debugonly)
 297                         continue;
 298                 rtm->rtm_type = RTM_DELETE;
 299                 rtm->rtm_seq = seqno;
 300                 rlen = write(s, next, rtm->rtm_msglen);
 301                 if (rlen < (int)rtm->rtm_msglen) {
 302                         warn("write to routing socket");
 303                         printf("got only %d for rlen\n", rlen);
 304                         break;
 305                 }
 306                 seqno++;
 307                 if (qflag)
 308                         continue;
 309                 if (verbose) {
 310                         print_rtmsg(rtm, rlen);
 311                 } else {
 312                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 313                         if (wflag) {
 314                             printf("%-20s ", rtm->rtm_flags & RTF_HOST ?
 315                                 routename(sa) : netname(sa));
 316                         } else {
 317                             printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
 318                                 routename(sa) : netname(sa));
 319                         }
 320                         sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) +
 321                             (char *)sa);
 322                         if (wflag) {
 323                             printf("%-20s ", routename(sa));
 324                         } else {
 325                             printf("%-20.20s ", routename(sa));
 326                         }
 327                         printf("done\n");
 328                 }
 329         }
 330 }
 331
 332 char *
 333 routename(struct sockaddr *sa)
 334 {
 335         const char *cp;
 336         static char line[MAXHOSTNAMELEN + 1];
 337         struct hostent *hp;
 338         static char domain[MAXHOSTNAMELEN + 1];
 339         static int first = 1;
 340
 341         if (first) {
 342                 first = 0;
 343                 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
 344                     (cp = strchr(domain, '.'))) {
 345                         domain[MAXHOSTNAMELEN] = '\0';
 346                         strcpy(domain, cp + 1);
 347                 } else
 348                         domain[0] = 0;
 349         }
 350
 351         if (sa->sa_len == 0)
 352                 strcpy(line, "default");
 353         else switch (sa->sa_family) {
 354
 355         case AF_INET:
 356             {   struct in_addr in;
 357                 in = ((struct sockaddr_in *)sa)->sin_addr;
 358
 359                 cp = NULL;
 360                 if (in.s_addr == INADDR_ANY || sa->sa_len < 4)
 361                         cp = "default";
 362                 if (cp == NULL && !nflag) {
 363                         hp = gethostbyaddr((char *)&in, sizeof(struct in_addr),
 364                                 AF_INET);
 365                         if (hp != NULL) {
 366                                 char *cptr;
 367                                 cptr = strchr(hp->h_name, '.');
 368                                 if (cptr != NULL && !wflag &&
 369                                     strcmp(cptr + 1, domain) == 0)
 370                                         *cptr = '\0';
 371                                 cp = hp->h_name;
 372                         }
 373                 }
 374                 if (cp != NULL) {
 375                         strncpy(line, cp, sizeof(line) - 1);
 376                         line[sizeof(line) - 1] = '\0';
 377                 } else
 378                         sprintf(line, "%s", inet_ntoa(in));
 379                 break;
 380             }
 381
 382 #ifdef INET6
 383         case AF_INET6:
 384         {
 385                 struct sockaddr_in6 sin6; /* use static var for safety */
 386                 int niflags = 0;
 387 #ifdef NI_WITHSCOPEID
 388                 niflags = NI_WITHSCOPEID;
 389 #endif
 390
 391                 memset(&sin6, 0, sizeof(sin6));
 392                 memcpy(&sin6, sa, sa->sa_len);
 393                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 394                 sin6.sin6_family = AF_INET6;
 395 #ifdef __KAME__
 396                 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
 397                     (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 398                      IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
 399                     sin6.sin6_scope_id == 0) {
 400                         sin6.sin6_scope_id =
 401                             ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 402                         sin6.sin6_addr.s6_addr[2] = 0;
 403                         sin6.sin6_addr.s6_addr[3] = 0;
 404                 }
 405 #endif
 406                 if (nflag)
 407                         niflags |= NI_NUMERICHOST;
 408                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 409                     line, sizeof(line), NULL, 0, niflags) != 0)
 410                         strncpy(line, "invalid", sizeof(line));
 411
 412                 return(line);
 413         }
 414 #endif
 415
 416         case AF_APPLETALK:
 417                 snprintf(line, sizeof(line), "atalk %s",
 418                         atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr));
 419                 break;
 420
 421 #ifdef NS
 422         case AF_NS:
 423                 return(ns_print((struct sockaddr_ns *)sa));
 424 #endif
 425
 426         case AF_LINK:
 427                 return(link_ntoa((struct sockaddr_dl *)sa));
 428
 429         default:
 430             {
 431                 /*
 432                  * Unknown address family; just render the raw
 433                  * data in sa->sa_data as hex values.
 434                  */
 435                 uint8_t *sp = (uint8_t *)sa->sa_data;
 436                 uint8_t *splim = (uint8_t *)sa + sa->sa_len;
 437                 char *cps = line + sprintf(line, "(%d)", sa->sa_family);
 438                 char *cpe = line + sizeof(line);
 439
 440                 while (sp < splim && cps < cpe)
 441                         cps += snprintf(cps, cpe - cps, " %02x", *sp++);
 442                 break;
 443             }
 444         }
 445         return(line);
 446 }
 447
 448 /*
 449  * Return the name of the network whose address is given.
 450  * The address is assumed to be that of a net or subnet, not a host.
 451  */
 452 char *
 453 netname(struct sockaddr *sa)
 454 {
 455         const char *cp = 0;
 456         static char line[MAXHOSTNAMELEN + 1];
 457         struct netent *np = 0;
 458         u_long net, mask;
 459         u_long i;
 460         int subnetshift;
 461
 462         switch (sa->sa_family) {
 463
 464         case AF_INET:
 465             {   struct in_addr in;
 466                 in = ((struct sockaddr_in *)sa)->sin_addr;
 467
 468                 i = in.s_addr = ntohl(in.s_addr);
 469                 if (in.s_addr == 0)
 470                         cp = "default";
 471                 else if (!nflag) {
 472                         if (IN_CLASSA(i)) {
 473                                 mask = IN_CLASSA_NET;
 474                                 subnetshift = 8;
 475                         } else if (IN_CLASSB(i)) {
 476                                 mask = IN_CLASSB_NET;
 477                                 subnetshift = 8;
 478                         } else {
 479                                 mask = IN_CLASSC_NET;
 480                                 subnetshift = 4;
 481                         }
 482                         /*
 483                          * If there are more bits than the standard mask
 484                          * would suggest, subnets must be in use.
 485                          * Guess at the subnet mask, assuming reasonable
 486                          * width subnet fields.
 487                          */
 488                         while (in.s_addr &~ mask)
 489                                 mask = (long)mask >> subnetshift;
 490                         net = in.s_addr & mask;
 491                         while ((mask & 1) == 0)
 492                                 mask >>= 1, net >>= 1;
 493                         np = getnetbyaddr(net, AF_INET);
 494                         if (np != NULL)
 495                                 cp = np->n_name;
 496                 }
 497 #define C(x)    (unsigned)((x) & 0xff)
 498                 if (cp != NULL)
 499                         strncpy(line, cp, sizeof(line));
 500                 else if ((in.s_addr & 0xffffff) == 0)
 501                         sprintf(line, "%u", C(in.s_addr >> 24));
 502                 else if ((in.s_addr & 0xffff) == 0)
 503                         sprintf(line, "%u.%u", C(in.s_addr >> 24),
 504                             C(in.s_addr >> 16));
 505                 else if ((in.s_addr & 0xff) == 0)
 506                         sprintf(line, "%u.%u.%u", C(in.s_addr >> 24),
 507                             C(in.s_addr >> 16), C(in.s_addr >> 8));
 508                 else
 509                         sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
 510                             C(in.s_addr >> 16), C(in.s_addr >> 8),
 511                             C(in.s_addr));
 512 #undef C
 513                 break;
 514             }
 515
 516 #ifdef INET6
 517         case AF_INET6:
 518         {
 519                 struct sockaddr_in6 sin6; /* use static var for safety */
 520                 int niflags = 0;
 521 #ifdef NI_WITHSCOPEID
 522                 niflags = NI_WITHSCOPEID;
 523 #endif
 524
 525                 memset(&sin6, 0, sizeof(sin6));
 526                 memcpy(&sin6, sa, sa->sa_len);
 527                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 528                 sin6.sin6_family = AF_INET6;
 529 #ifdef __KAME__
 530                 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
 531                     (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 532                      IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
 533                     sin6.sin6_scope_id == 0) {
 534                         sin6.sin6_scope_id =
 535                             ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 536                         sin6.sin6_addr.s6_addr[2] = 0;
 537                         sin6.sin6_addr.s6_addr[3] = 0;
 538                 }
 539 #endif
 540                 if (nflag)
 541                         niflags |= NI_NUMERICHOST;
 542                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 543                     line, sizeof(line), NULL, 0, niflags) != 0)
 544                         strncpy(line, "invalid", sizeof(line));
 545
 546                 return(line);
 547         }
 548 #endif
 549
 550         case AF_APPLETALK:
 551                 snprintf(line, sizeof(line), "atalk %s",
 552                         atalk_ntoa(((struct sockaddr_at *)sa)->sat_addr));
 553                 break;
 554
 555 #ifdef NS
 556         case AF_NS:
 557                 return(ns_print((struct sockaddr_ns *)sa));
 558                 break;
 559 #endif
 560
 561         case AF_LINK:
 562                 return(link_ntoa((struct sockaddr_dl *)sa));
 563
 564
 565         default:
 566             {
 567                 /*
 568                  * Unknown address family; just render the raw
 569                  * data in sa->sa_data as hex values.
 570                  */
 571                 uint8_t *sp = (uint8_t *)sa->sa_data;
 572                 uint8_t *splim = (uint8_t *)sa + sa->sa_len;
 573                 char *cps = line + sprintf(line, "af %d:", sa->sa_family);
 574                 char *cpe = line + sizeof(line);
 575
 576                 while (sp < splim && cps < cpe)
 577                         cps += snprintf(cps, cpe - cps, " %02x", *sp++);
 578                 break;
 579             }
 580         }
 581         return(line);
 582 }
 583
 584 static void
 585 set_metric(char *value, int key)
 586 {
 587         int flag = 0;
 588         u_long noval, *valp = &noval;
 589
 590         switch (key) {
 591 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
 592         caseof(K_MTU, RTV_MTU, rmx_mtu);
 593         caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
 594         caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
 595         caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
 596         caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
 597         caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
 598         caseof(K_RTT, RTV_RTT, rmx_rtt);
 599         caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
 600         }
 601         rtm_inits |= flag;
 602         if (lockrest || locking)
 603                 rt_metrics.rmx_locks |= flag;
 604         if (locking)
 605                 locking = 0;
 606         *valp = atoi(value);
 607 }
 608
 609 static void
 610 newroute(int argc, char **argv)
 611 {
 612         char *cmd;
 613         const char *err_str, *dest = "", *gateway = "";
 614         int ishost = 0, proxy = 0, ret, attempts, oerrno, flags = RTF_STATIC;
 615         int key;
 616         struct hostent *hp = 0;
 617
 618         if (uid != 0) {
 619                 errx(EX_NOPERM, "must be root to alter routing table");
 620         }
 621         cmd = argv[0];
 622         if (*cmd != 'g')
 623                 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 624         while (--argc > 0) {
 625                 if (**(++argv)== '-') {
 626                         switch (key = keyword(1 + *argv)) {
 627                         case K_LINK:
 628                                 af = AF_LINK;
 629                                 aflen = sizeof(struct sockaddr_dl);
 630                                 break;
 631                         case K_INET:
 632                                 af = AF_INET;
 633                                 aflen = sizeof(struct sockaddr_in);
 634                                 break;
 635 #ifdef INET6
 636                         case K_INET6:
 637                                 af = AF_INET6;
 638                                 aflen = sizeof(struct sockaddr_in6);
 639                                 break;
 640 #endif
 641                         case K_ATALK:
 642                                 af = AF_APPLETALK;
 643                                 aflen = sizeof(struct sockaddr_at);
 644                                 break;
 645                         case K_SA:
 646                                 af = PF_ROUTE;
 647                                 aflen = sizeof(union sockunion);
 648                                 break;
 649 #ifdef NS
 650                         case K_XNS:
 651                                 af = AF_NS;
 652                                 aflen = sizeof(struct sockaddr_ns);
 653                                 break;
 654 #endif
 655                         case K_IFACE:
 656                         case K_INTERFACE:
 657                                 iflag++;
 658                                 break;
 659                         case K_NOSTATIC:
 660                                 flags &= ~RTF_STATIC;
 661                                 break;
 662                         case K_LLINFO:
 663                                 flags |= RTF_LLINFO;
 664                                 break;
 665                         case K_LOCK:
 666                                 locking = 1;
 667                                 break;
 668                         case K_LOCKREST:
 669                                 lockrest = 1;
 670                                 break;
 671                         case K_HOST:
 672                                 forcehost++;
 673                                 break;
 674                         case K_REJECT:
 675                                 flags |= RTF_REJECT;
 676                                 break;
 677                         case K_BLACKHOLE:
 678                                 flags |= RTF_BLACKHOLE;
 679                                 break;
 680                         case K_PROTO1:
 681                                 flags |= RTF_PROTO1;
 682                                 break;
 683                         case K_PROTO2:
 684                                 flags |= RTF_PROTO2;
 685                                 break;
 686                         case K_PROXY:
 687                                 proxy = 1;
 688                                 break;
 689                         case K_CLONING:
 690                                 flags |= RTF_CLONING;
 691                                 break;
 692                         case K_XRESOLVE:
 693                                 flags |= RTF_XRESOLVE;
 694                                 break;
 695                         case K_STATIC:
 696                                 flags |= RTF_STATIC;
 697                                 break;
 698                         case K_IFA:
 699                                 if (--argc == 0)
 700                                         usage((char *)NULL);
 701                                 getaddr(RTA_IFA, *++argv, 0);
 702                                 break;
 703                         case K_IFP:
 704                                 if (--argc == 0)
 705                                         usage((char *)NULL);
 706                                 getaddr(RTA_IFP, *++argv, 0);
 707                                 break;
 708                         case K_GENMASK:
 709                                 if (--argc == 0)
 710                                         usage((char *)NULL);
 711                                 getaddr(RTA_GENMASK, *++argv, 0);
 712                                 break;
 713                         case K_GATEWAY:
 714                                 if (--argc == 0)
 715                                         usage((char *)NULL);
 716                                 getaddr(RTA_GATEWAY, *++argv, 0);
 717                                 break;
 718                         case K_DST:
 719                                 if (--argc == 0)
 720                                         usage((char *)NULL);
 721                                 ishost = getaddr(RTA_DST, *++argv, &hp);
 722                                 dest = *argv;
 723                                 break;
 724                         case K_NETMASK:
 725                                 if (--argc == 0)
 726                                         usage((char *)NULL);
 727                                 getaddr(RTA_NETMASK, *++argv, 0);
 728                                 /* FALLTHROUGH */
 729                         case K_NET:
 730                                 forcenet++;
 731                                 break;
 732                         case K_PREFIXLEN:
 733                                 if (--argc == 0)
 734                                         usage((char *)NULL);
 735                                 if (prefixlen(*++argv) == -1) {
 736                                         forcenet = 0;
 737                                         ishost = 1;
 738                                 } else {
 739                                         forcenet = 1;
 740                                         ishost = 0;
 741                                 }
 742                                 break;
 743                         case K_MTU:
 744                         case K_HOPCOUNT:
 745                         case K_EXPIRE:
 746                         case K_RECVPIPE:
 747                         case K_SENDPIPE:
 748                         case K_SSTHRESH:
 749                         case K_RTT:
 750                         case K_RTTVAR:
 751                                 if (--argc == 0)
 752                                         usage((char *)NULL);
 753                                 set_metric(*++argv, key);
 754                                 break;
 755                         default:
 756                                 usage(1+*argv);
 757                         }
 758                 } else {
 759                         if ((rtm_addrs & RTA_DST) == 0) {
 760                                 dest = *argv;
 761                                 ishost = getaddr(RTA_DST, *argv, &hp);
 762                         } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
 763                                 gateway = *argv;
 764                                 getaddr(RTA_GATEWAY, *argv, &hp);
 765                         } else {
 766                                 getaddr(RTA_NETMASK, *argv, 0);
 767                                 forcenet = 1;
 768                         }
 769                 }
 770         }
 771         if (forcehost) {
 772                 ishost = 1;
 773 #ifdef INET6
 774                 if (af == AF_INET6) {
 775                         rtm_addrs &= ~RTA_NETMASK;
 776                         memset((void *)&so_mask, 0, sizeof(so_mask));
 777                 }
 778 #endif
 779         }
 780         if (forcenet)
 781                 ishost = 0;
 782         flags |= RTF_UP;
 783         if (ishost)
 784                 flags |= RTF_HOST;
 785         if (iflag == 0)
 786                 flags |= RTF_GATEWAY;
 787         if (proxy) {
 788                 so_dst.sinarp.sin_other = SIN_PROXY;
 789                 flags |= RTF_ANNOUNCE;
 790         }
 791         for (attempts = 1; ; attempts++) {
 792                 errno = 0;
 793                 if ((ret = rtmsg(*cmd, flags)) == 0)
 794                         break;
 795                 if (errno != ENETUNREACH && errno != ESRCH)
 796                         break;
 797                 if (af == AF_INET && *gateway != '\0' &&
 798                     hp != NULL && hp->h_addr_list[1] != NULL) {
 799                         hp->h_addr_list++;
 800                         memmove(&so_gate.sin.sin_addr,
 801                                 hp->h_addr_list[0],
 802                                 MIN((size_t)hp->h_length,
 803                                     sizeof(so_gate.sin.sin_addr)));
 804                 } else
 805                         break;
 806         }
 807         if (*cmd == 'g')
 808                 exit(0);
 809         if (!qflag) {
 810                 oerrno = errno;
 811                 printf("%s %s %s", cmd, ishost? "host" : "net", dest);
 812                 if (*gateway != '\0') {
 813                         printf(": gateway %s", gateway);
 814                         if (attempts > 1 && ret == 0 && af == AF_INET)
 815                             printf(" (%s)",
 816                                 inet_ntoa(((struct sockaddr_in *)&route.rt_gateway)->sin_addr));
 817                 }
 818                 if (ret == 0) {
 819                         printf("\n");
 820                 } else {
 821                         switch (oerrno) {
 822                         case ESRCH:
 823                                 err_str = "not in table";
 824                                 break;
 825                         case EBUSY:
 826                                 err_str = "entry in use";
 827                                 break;
 828                         case ENOBUFS:
 829                                 err_str = "routing table overflow";
 830                                 break;
 831                         case EDQUOT: /* handle recursion avoidance in
 832                                         rt_setgate() */
 833                                 err_str = "gateway uses the same route";
 834                                 break;
 835                         default:
 836                                 err_str = strerror(oerrno);
 837                                 break;
 838                         }
 839                         printf(": %s\n", err_str);
 840                 }
 841         }
 842         exit(ret != 0);
 843 }
 844
 845 static void
 846 inet_makenetandmask(u_long net, struct sockaddr_in *in, u_long bits)
 847 {
 848         u_long addr, mask = 0;
 849         char *cp;
 850
 851         rtm_addrs |= RTA_NETMASK;
 852         if (net == 0)
 853                 mask = addr = 0;
 854         else {
 855                 if (net <= 0xff)
 856                         addr = net << 24;
 857                 else if (net <= 0xffff)
 858                         addr = net << 16;
 859                 else if (net <= 0xffffff)
 860                         addr = net << 8;
 861                 else
 862                         addr = net;
 863
 864                 if (bits)
 865                         mask = 0xffffffff << (32 - bits);
 866                 else {
 867                         if (IN_CLASSA(addr)) {
 868                                 mask = IN_CLASSA_NET;
 869                         } else if (IN_CLASSB(addr)) {
 870                                 mask = IN_CLASSB_NET;
 871                         } else if (IN_CLASSC(addr)) {
 872                                 mask = IN_CLASSC_NET;
 873                         } else
 874                                 mask = 0xffffffff;
 875                 }
 876                 addr &= mask;
 877         }
 878         in->sin_addr.s_addr = htonl(addr);
 879         in = &so_mask.sin;
 880         in->sin_addr.s_addr = htonl(mask);
 881         in->sin_len = 0;
 882         in->sin_family = 0;
 883         cp = (char *)(&in->sin_addr + 1);
 884         while (*--cp == 0 && cp > (char *)in)
 885                 ;
 886         in->sin_len = 1 + cp - (char *)in;
 887 }
 888
 889 #ifdef INET6
 890 /*
 891  * XXX the function may need more improvement...
 892  */
 893 static int
 894 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
 895 {
 896         struct in6_addr in6;
 897
 898         if (plen == NULL) {
 899                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
 900                     sin6->sin6_scope_id == 0) {
 901                         plen = "0";
 902                 } else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
 903                         /* aggregatable global unicast - RFC2374 */
 904                         memset(&in6, 0, sizeof(in6));
 905                         if (memcmp(&sin6->sin6_addr.s6_addr[8],
 906                                    &in6.s6_addr[8], 8) == 0)
 907                                 plen = "64";
 908                 }
 909         }
 910
 911         if (plen == NULL || strcmp(plen, "128") == 0)
 912                 return(1);
 913         rtm_addrs |= RTA_NETMASK;
 914         prefixlen(plen);
 915         return(0);
 916 }
 917 #endif
 918
 919 /*
 920  * Interpret an argument as a network address of some kind,
 921  * returning 1 if a host address, 0 if a network address.
 922  */
 923 static int
 924 getaddr(int which, char *str, struct hostent **hpp)
 925 {
 926         sup su;
 927         struct hostent *hp;
 928         struct netent *np;
 929         u_long val;
 930         char *q;
 931         int afamily;  /* local copy of af so we can change it */
 932
 933         if (af == 0) {
 934                 af = AF_INET;
 935                 aflen = sizeof(struct sockaddr_in);
 936         }
 937         afamily = af;
 938         rtm_addrs |= which;
 939         switch (which) {
 940         case RTA_DST:
 941                 su = &so_dst;
 942                 break;
 943         case RTA_GATEWAY:
 944                 su = &so_gate;
 945                 if (iflag) {
 946                         struct ifaddrs *ifap, *ifa;
 947                         struct sockaddr_dl *sdl = NULL;
 948
 949                         if (getifaddrs(&ifap))
 950                                 err(1, "getifaddrs");
 951
 952                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
 953                                 if (ifa->ifa_addr->sa_family != AF_LINK)
 954                                         continue;
 955
 956                                 if (strcmp(str, ifa->ifa_name) != 0)
 957                                         continue;
 958
 959                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 960                         }
 961                         /* If we found it, then use it */
 962                         if (sdl != NULL) {
 963                                 /*
 964                                  * Copy is safe since we have a
 965                                  * sockaddr_storage member in sockunion{}.
 966                                  * Note that we need to copy before calling
 967                                  * freeifaddrs().
 968                                  *
 969                                  * Interface routes are routed only by their
 970                                  * sdl_index or interface name (we provide
 971                                  * both here), not by the ARP address of the
 972                                  * local interface (alen, slen = 0).
 973                                  */
 974                                 memcpy(&su->sdl, sdl, sdl->sdl_len);
 975                                 su->sdl.sdl_alen = 0;
 976                                 su->sdl.sdl_slen = 0;
 977                         }
 978                         freeifaddrs(ifap);
 979                         if (sdl != NULL)
 980                                 return(1);
 981                 }
 982                 break;
 983         case RTA_NETMASK:
 984                 su = &so_mask;
 985                 break;
 986         case RTA_GENMASK:
 987                 su = &so_genmask;
 988                 break;
 989         case RTA_IFP:
 990                 su = &so_ifp;
 991                 afamily = AF_LINK;
 992                 break;
 993         case RTA_IFA:
 994                 su = &so_ifa;
 995                 break;
 996         default:
 997                 usage("internal error");
 998                 /*NOTREACHED*/
 999         }
1000         su->sa.sa_len = aflen;
1001         su->sa.sa_family = afamily; /* cases that don't want it have left
1002                                        already */
1003         if (strcmp(str, "default") == 0) {
1004                 /*
1005                  * Default is net 0.0.0.0/0
1006                  */
1007                 switch (which) {
1008                 case RTA_DST:
1009                         forcenet++;
1010                         /* bzero(su, sizeof(*su)); *//* for readability */
1011                         getaddr(RTA_NETMASK, str, 0);
1012                         break;
1013                 case RTA_NETMASK:
1014                 case RTA_GENMASK:
1015                         /* bzero(su, sizeof(*su)); *//* for readability */
1016                         break;
1017                 }
1018                 return(0);
1019         }
1020         switch (afamily) {
1021 #ifdef INET6
1022         case AF_INET6:
1023         {
1024                 struct addrinfo hints, *res;
1025
1026                 q = NULL;
1027                 if (which == RTA_DST && (q = strchr(str, '/')) != NULL)
1028                         *q = '\0';
1029                 memset(&hints, 0, sizeof(hints));
1030                 hints.ai_family = afamily;      /*AF_INET6*/
1031                 hints.ai_flags = AI_NUMERICHOST;
1032                 hints.ai_socktype = SOCK_DGRAM;         /*dummy*/
1033                 if (getaddrinfo(str, "0", &hints, &res) != 0 ||
1034                     res->ai_family != AF_INET6 ||
1035                     res->ai_addrlen != sizeof(su->sin6)) {
1036                         fprintf(stderr, "%s: bad value\n", str);
1037                         exit(1);
1038                 }
1039                 memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6));
1040 #ifdef __KAME__
1041                 if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) ||
1042                      IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr)) &&
1043                     su->sin6.sin6_scope_id) {
1044                         *(u_int16_t *)&su->sin6.sin6_addr.s6_addr[2] =
1045                                 htons(su->sin6.sin6_scope_id);
1046                         su->sin6.sin6_scope_id = 0;
1047                 }
1048 #endif
1049                 freeaddrinfo(res);
1050                 if (q != NULL)
1051                         *q++ = '/';
1052                 if (which == RTA_DST)
1053                         return(inet6_makenetandmask(&su->sin6, q));
1054                 return(0);
1055         }
1056 #endif /* INET6 */
1057
1058 #ifdef NS
1059         case AF_NS:
1060                 if (which == RTA_DST) {
1061                         struct sockaddr_ns *sms = &(so_mask.sns);
1062                         memset(sms, 0, sizeof(*sms));
1063                         sms->sns_family = 0;
1064                         sms->sns_len = 6;
1065                         sms->sns_addr.x_net = *(union ns_net *)ns_bh;
1066                         rtm_addrs |= RTA_NETMASK;
1067                 }
1068                 su->sns.sns_addr = ns_addr(str);
1069                 return(!ns_nullhost(su->sns.sns_addr));
1070 #endif
1071
1072
1073         case AF_APPLETALK:
1074                 if (!atalk_aton(str, &su->sat.sat_addr))
1075                         errx(EX_NOHOST, "bad address: %s", str);
1076                 rtm_addrs |= RTA_NETMASK;
1077                 return(forcehost || su->sat.sat_addr.s_node != 0);
1078
1079         case AF_LINK:
1080                 link_addr(str, &su->sdl);
1081                 return(1);
1082
1083
1084         case PF_ROUTE:
1085                 su->sa.sa_len = sizeof(*su);
1086                 sockaddr(str, &su->sa);
1087                 return(1);
1088
1089         case AF_INET:
1090         default:
1091                 break;
1092         }
1093
1094         if (hpp == NULL)
1095                 hpp = &hp;
1096         *hpp = NULL;
1097
1098         q = strchr(str,'/');
1099         if (q != NULL && which == RTA_DST) {
1100                 *q = '\0';
1101                 if ((val = inet_network(str)) != INADDR_NONE) {
1102                         inet_makenetandmask(
1103                                 val, &su->sin, strtoul(q+1, 0, 0));
1104                         return(0);
1105                 }
1106                 *q = '/';
1107         }
1108         if ((which != RTA_DST || forcenet == 0) &&
1109             inet_aton(str, &su->sin.sin_addr)) {
1110                 val = su->sin.sin_addr.s_addr;
1111                 if (which != RTA_DST ||
1112                     inet_lnaof(su->sin.sin_addr) != INADDR_ANY)
1113                         return(1);
1114                 else {
1115                         val = ntohl(val);
1116                         goto netdone;
1117                 }
1118         }
1119         if (which == RTA_DST && forcehost == 0 &&
1120             ((val = inet_network(str)) != INADDR_NONE ||
1121             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1122 netdone:
1123                 inet_makenetandmask(val, &su->sin, 0);
1124                 return(0);
1125         }
1126         hp = gethostbyname(str);
1127         if (hp != NULL) {
1128                 *hpp = hp;
1129                 su->sin.sin_family = hp->h_addrtype;
1130                 memmove((char *)&su->sin.sin_addr, hp->h_addr,
1131                     MIN((size_t)hp->h_length, sizeof(su->sin.sin_addr)));
1132                 return(1);
1133         }
1134         errx(EX_NOHOST, "bad address: %s", str);
1135 }
1136
1137 static int
1138 prefixlen(const char *len_str)
1139 {
1140         int len = atoi(len_str), q, r;
1141         int max;
1142         char *p;
1143
1144         rtm_addrs |= RTA_NETMASK;
1145         switch (af) {
1146 #ifdef INET6
1147         case AF_INET6:
1148                 max = 128;
1149                 p = (char *)&so_mask.sin6.sin6_addr;
1150                 break;
1151 #endif
1152         case AF_INET:
1153                 max = 32;
1154                 p = (char *)&so_mask.sin.sin_addr;
1155                 break;
1156         default:
1157                 fprintf(stderr, "prefixlen not supported in this af\n");
1158                 exit(1);
1159                 /*NOTREACHED*/
1160         }
1161
1162         if (len < 0 || max < len) {
1163                 fprintf(stderr, "%s: bad value\n", len_str);
1164                 exit(1);
1165         }
1166
1167         q = len >> 3;
1168         r = len & 7;
1169         so_mask.sa.sa_family = af;
1170         so_mask.sa.sa_len = aflen;
1171         memset((void *)p, 0, max / 8);
1172         if (q > 0)
1173                 memset((void *)p, 0xff, q);
1174         if (r > 0)
1175                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1176         if (len == max)
1177                 return(-1);
1178         else
1179                 return(len);
1180 }
1181
1182 #ifdef NS
1183 short ns_nullh[] = {0,0,0};
1184
1185 char *
1186 ns_print(struct sockaddr_ns *sns)
1187 {
1188         struct ns_addr work;
1189         union { union ns_net net_e; u_long long_e; } net;
1190         u_short port;
1191         static char mybuf[50+MAXHOSTNAMELEN], cport[10], chost[25];
1192         const char *host = "";
1193         char *p;
1194         u_char *q;
1195
1196         work = sns->sns_addr;
1197         port = ntohs(work.x_port);
1198         work.x_port = 0;
1199         net.net_e  = work.x_net;
1200         if (ns_nullhost(work) && net.long_e == 0) {
1201                 if (port == 0)
1202                         strncpy(mybuf, "*.*", sizeof(mybuf));
1203                 else
1204                         sprintf(mybuf, "*.%XH", port);
1205                 return(mybuf);
1206         }
1207
1208         if (memcmp(ns_bh, work.x_host.c_host, 6) == 0)
1209                 host = "any";
1210         else if (memcmp(ns_nullh, work.x_host.c_host, 6) == 0)
1211                 host = "*";
1212         else {
1213                 q = work.x_host.c_host;
1214                 sprintf(chost, "%02X%02X%02X%02X%02X%02XH",
1215                         q[0], q[1], q[2], q[3], q[4], q[5]);
1216                 for (p = chost; *p == '0' && p < chost + 12; p++)
1217                         /* void */;
1218                 host = p;
1219         }
1220         if (port != 0)
1221                 sprintf(cport, ".%XH", htons(port));
1222         else
1223                 *cport = 0;
1224
1225         snprintf(mybuf, sizeof(mybuf), "%lxH.%s%s",
1226                         (unsigned long)ntohl(net.long_e),
1227                         host, cport);
1228         return(mybuf);
1229 }
1230 #endif
1231
1232 static void
1233 interfaces(void)
1234 {
1235         size_t needed;
1236         int mib[6];
1237         char *buf, *lim, *next;
1238         struct rt_msghdr *rtm;
1239
1240         mib[0] = CTL_NET;
1241         mib[1] = PF_ROUTE;
1242         mib[2] = 0;             /* protocol */
1243         mib[3] = 0;             /* wildcard address family */
1244         mib[4] = NET_RT_IFLIST;
1245         mib[5] = 0;             /* no flags */
1246         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
1247                 err(EX_OSERR, "route-sysctl-estimate");
1248         if ((buf = malloc(needed)) == NULL)
1249                 errx(EX_OSERR, "malloc failed");
1250         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
1251                 err(EX_OSERR, "actual retrieval of interface table");
1252         lim = buf + needed;
1253         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1254                 rtm = (struct rt_msghdr *)next;
1255                 print_rtmsg(rtm, rtm->rtm_msglen);
1256         }
1257 }
1258
1259 static void
1260 monitor(void)
1261 {
1262         int n;
1263         char msg[2048];
1264
1265         verbose = 1;
1266         if (debugonly) {
1267                 interfaces();
1268                 exit(0);
1269         }
1270         for (;;) {
1271                 time_t now;
1272                 n = read(s, msg, 2048);
1273                 now = time(NULL);
1274                 printf("\ngot message of size %d on %s", n, ctime(&now));
1275                 print_rtmsg((struct rt_msghdr *)msg, n);
1276         }
1277 }
1278
1279 struct {
1280         struct  rt_msghdr m_rtm;
1281         char    m_space[512];
1282 } m_rtmsg;
1283
1284 static int
1285 rtmsg(int cmd, int flags)
1286 {
1287         static int seq;
1288         int rlen;
1289         char *cp = m_rtmsg.m_space;
1290         int l;
1291
1292 #define NEXTADDR(w, u) \
1293         if (rtm_addrs & (w)) {\
1294             l = ROUNDUP(u.sa.sa_len); memmove(cp, &(u), l); cp += l;\
1295             if (verbose) sodump(&(u),"u");\
1296         }
1297
1298         errno = 0;
1299         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1300         if (cmd == 'a')
1301                 cmd = RTM_ADD;
1302         else if (cmd == 'c')
1303                 cmd = RTM_CHANGE;
1304         else if (cmd == 'g') {
1305                 cmd = RTM_GET;
1306                 if (so_ifp.sa.sa_family == 0) {
1307                         so_ifp.sa.sa_family = AF_LINK;
1308                         so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
1309                         rtm_addrs |= RTA_IFP;
1310                 }
1311         } else
1312                 cmd = RTM_DELETE;
1313 #define rtm m_rtmsg.m_rtm
1314         rtm.rtm_type = cmd;
1315         rtm.rtm_flags = flags;
1316         rtm.rtm_version = RTM_VERSION;
1317         rtm.rtm_seq = ++seq;
1318         rtm.rtm_addrs = rtm_addrs;
1319         rtm.rtm_rmx = rt_metrics;
1320         rtm.rtm_inits = rtm_inits;
1321
1322         if (rtm_addrs & RTA_NETMASK)
1323                 mask_addr();
1324         NEXTADDR(RTA_DST, so_dst);
1325         NEXTADDR(RTA_GATEWAY, so_gate);
1326         NEXTADDR(RTA_NETMASK, so_mask);
1327         NEXTADDR(RTA_GENMASK, so_genmask);
1328         NEXTADDR(RTA_IFP, so_ifp);
1329         NEXTADDR(RTA_IFA, so_ifa);
1330         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1331         if (verbose)
1332                 print_rtmsg(&rtm, l);
1333         if (debugonly)
1334                 return(0);
1335         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1336                 warn("writing to routing socket");
1337                 return(-1);
1338         }
1339         if (cmd == RTM_GET) {
1340                 do {
1341                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1342                 } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
1343                 if (l < 0)
1344                         warn("read from routing socket");
1345                 else
1346                         print_getmsg(&rtm, l);
1347         }
1348 #undef rtm
1349         return(0);
1350 }
1351
1352 static void
1353 mask_addr(void)
1354 {
1355         int olen = so_mask.sa.sa_len;
1356         char *cp1 = olen + (char *)&so_mask, *cp2;
1357
1358         for (so_mask.sa.sa_len = 0; cp1 > (char *)&so_mask; )
1359                 if (*--cp1 != 0) {
1360                         so_mask.sa.sa_len = 1 + cp1 - (char *)&so_mask;
1361                         break;
1362                 }
1363         if ((rtm_addrs & RTA_DST) == 0)
1364                 return;
1365         switch (so_dst.sa.sa_family) {
1366 #ifdef NS
1367         case AF_NS:
1368 #endif
1369         case AF_INET:
1370 #ifdef INET6
1371         case AF_INET6:
1372 #endif
1373         case AF_APPLETALK:
1374         case 0:
1375                 return;
1376         }
1377         cp1 = so_mask.sa.sa_len + 1 + (char *)&so_dst;
1378         cp2 = so_dst.sa.sa_len + 1 + (char *)&so_dst;
1379         while (cp2 > cp1)
1380                 *--cp2 = 0;
1381         cp2 = so_mask.sa.sa_len + 1 + (char *)&so_mask;
1382         while (cp1 > so_dst.sa.sa_data)
1383                 *--cp1 &= *--cp2;
1384 }
1385
1386 const char *msgtypes[] = {
1387         "",
1388         "RTM_ADD: Add Route",
1389         "RTM_DELETE: Delete Route",
1390         "RTM_CHANGE: Change Metrics or flags",
1391         "RTM_GET: Report Metrics",
1392         "RTM_LOSING: Kernel Suspects Partitioning",
1393         "RTM_REDIRECT: Told to use different route",
1394         "RTM_MISS: Lookup failed on this address",
1395         "RTM_LOCK: fix specified metrics",
1396         "RTM_OLDADD: caused by SIOCADDRT",
1397         "RTM_OLDDEL: caused by SIOCDELRT",
1398         "RTM_RESOLVE: Route created by cloning",
1399         "RTM_NEWADDR: address being added to iface",
1400         "RTM_DELADDR: address being removed from iface",
1401         "RTM_IFINFO: iface status change",
1402         "RTM_NEWMADDR: new multicast group membership on iface",
1403         "RTM_DELMADDR: multicast group membership removed from iface",
1404         "RTM_IFANNOUNCE: interface arrival/departure",
1405         0,
1406 };
1407
1408 char metricnames[] =
1409 "\011pksent\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire\2hopcount"
1410 "\1mtu";
1411 char routeflags[] =
1412 "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE\010MASK_PRESENT"
1413 "\011CLONING\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE\016b016"
1414 "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3\024CHAINDELETE"
1415 "\025PINNED\026LOCAL\027BROADCAST\030MULTICAST";
1416 char ifnetflags[] =
1417 "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1418 "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1419 "\017LINK2\020MULTICAST";
1420 char addrnames[] =
1421 "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD";
1422
1423 static void
1424 print_rtmsg(struct rt_msghdr *rtm, int msglen __unused)
1425 {
1426         struct if_msghdr *ifm;
1427         struct ifa_msghdr *ifam;
1428 #ifdef RTM_NEWMADDR
1429         struct ifma_msghdr *ifmam;
1430 #endif
1431         struct if_announcemsghdr *ifan;
1432
1433         if (verbose == 0)
1434                 return;
1435         if (rtm->rtm_version != RTM_VERSION) {
1436                 printf("routing message version %d not understood\n",
1437                     rtm->rtm_version);
1438                 return;
1439         }
1440         if (msgtypes[rtm->rtm_type] != NULL)
1441                 printf("%s: ", msgtypes[rtm->rtm_type]);
1442         else
1443                 printf("#%d: ", rtm->rtm_type);
1444         printf("len %d, ", rtm->rtm_msglen);
1445         switch (rtm->rtm_type) {
1446         case RTM_IFINFO:
1447                 ifm = (struct if_msghdr *)rtm;
1448                 printf("if# %d, flags:", ifm->ifm_index);
1449                 bprintf(stdout, ifm->ifm_flags, ifnetflags);
1450                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs);
1451                 break;
1452         case RTM_NEWADDR:
1453         case RTM_DELADDR:
1454                 ifam = (struct ifa_msghdr *)rtm;
1455                 printf("metric %d, flags:", ifam->ifam_metric);
1456                 bprintf(stdout, ifam->ifam_flags, routeflags);
1457                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs);
1458                 break;
1459 #ifdef RTM_NEWMADDR
1460         case RTM_NEWMADDR:
1461         case RTM_DELMADDR:
1462                 ifmam = (struct ifma_msghdr *)rtm;
1463                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs);
1464                 break;
1465 #endif
1466         case RTM_IFANNOUNCE:
1467                 ifan = (struct if_announcemsghdr *)rtm;
1468                 printf("if# %d, what: ", ifan->ifan_index);
1469                 switch (ifan->ifan_what) {
1470                 case IFAN_ARRIVAL:
1471                         printf("arrival");
1472                         break;
1473                 case IFAN_DEPARTURE:
1474                         printf("departure");
1475                         break;
1476                 default:
1477                         printf("#%d", ifan->ifan_what);
1478                         break;
1479                 }
1480                 printf("\n");
1481                 break;
1482
1483         default:
1484                 printf("pid: %ld, seq %d, errno %d, flags:",
1485                         (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1486                 bprintf(stdout, rtm->rtm_flags, routeflags);
1487                 pmsg_common(rtm);
1488         }
1489 }
1490
1491 static void
1492 print_getmsg(struct rt_msghdr *rtm, int msglen)
1493 {
1494         struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
1495         struct sockaddr_dl *ifp = NULL;
1496         struct sockaddr *sa;
1497         char *cp;
1498         int i;
1499
1500         printf("   route to: %s\n", routename(&so_dst.sa));
1501         if (rtm->rtm_version != RTM_VERSION) {
1502                 warnx("routing message version %d not understood",
1503                      rtm->rtm_version);
1504                 return;
1505         }
1506         if (rtm->rtm_msglen > msglen) {
1507                 warnx("message length mismatch, in packet %d, returned %d",
1508                       rtm->rtm_msglen, msglen);
1509         }
1510         if (rtm->rtm_errno != 0)  {
1511                 errno = rtm->rtm_errno;
1512                 warn("message indicates error %d", errno);
1513                 return;
1514         }
1515         cp = ((char *)(rtm + 1));
1516         if (rtm->rtm_addrs)
1517                 for (i = 1; i != 0; i <<= 1)
1518                         if (i & rtm->rtm_addrs) {
1519                                 sa = (struct sockaddr *)cp;
1520                                 switch (i) {
1521                                 case RTA_DST:
1522                                         dst = sa;
1523                                         break;
1524                                 case RTA_GATEWAY:
1525                                         gate = sa;
1526                                         break;
1527                                 case RTA_NETMASK:
1528                                         mask = sa;
1529                                         break;
1530                                 case RTA_IFP:
1531                                         if (sa->sa_family == AF_LINK &&
1532                                            ((struct sockaddr_dl *)sa)->sdl_nlen)
1533                                                 ifp = (struct sockaddr_dl *)sa;
1534                                         break;
1535                                 }
1536                                 ADVANCE(cp, sa);
1537                         }
1538         if (dst != NULL && mask != NULL)
1539                 mask->sa_family = dst->sa_family;       /* XXX */
1540         if (dst != NULL)
1541                 printf("destination: %s\n", routename(dst));
1542         if (mask != NULL) {
1543                 int savenflag = nflag;
1544
1545                 nflag = 1;
1546                 printf("       mask: %s\n", routename(mask));
1547                 nflag = savenflag;
1548         }
1549         if (gate != NULL && rtm->rtm_flags & RTF_GATEWAY)
1550                 printf("    gateway: %s\n", routename(gate));
1551         if (ifp != NULL)
1552                 printf("  interface: %.*s\n",
1553                     ifp->sdl_nlen, ifp->sdl_data);
1554         printf("      flags: ");
1555         bprintf(stdout, rtm->rtm_flags, routeflags);
1556
1557 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1558 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1559
1560         printf("\n%s\n", "\
1561  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire");
1562         printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1563         printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1564         printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1565         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1566         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rttvar), lock(RTTVAR));
1567         printf("%8ld%c ", rtm->rtm_rmx.rmx_hopcount, lock(HOPCOUNT));
1568         printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1569         if (rtm->rtm_rmx.rmx_expire != 0)
1570                 rtm->rtm_rmx.rmx_expire -= time(0);
1571         printf("%8ld%c\n", rtm->rtm_rmx.rmx_expire, lock(EXPIRE));
1572 #undef lock
1573 #undef msec
1574 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1575         if (verbose)
1576                 pmsg_common(rtm);
1577         else if (rtm->rtm_addrs &~ RTA_IGN) {
1578                 printf("sockaddrs: ");
1579                 bprintf(stdout, rtm->rtm_addrs, addrnames);
1580                 putchar('\n');
1581         }
1582 #undef  RTA_IGN
1583 }
1584
1585 static void
1586 pmsg_common(struct rt_msghdr *rtm)
1587 {
1588         printf("\nlocks: ");
1589         bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames);
1590         printf(" inits: ");
1591         bprintf(stdout, rtm->rtm_inits, metricnames);
1592         pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs);
1593 }
1594
1595 static void
1596 pmsg_addrs(char *cp, int addrs)
1597 {
1598         struct sockaddr *sa;
1599         int i;
1600
1601         if (addrs == 0) {
1602                 putchar('\n');
1603                 return;
1604         }
1605         printf("\nsockaddrs: ");
1606         bprintf(stdout, addrs, addrnames);
1607         putchar('\n');
1608         for (i = 1; i != 0; i <<= 1)
1609                 if (i & addrs) {
1610                         sa = (struct sockaddr *)cp;
1611                         printf(" %s", routename(sa));
1612                         ADVANCE(cp, sa);
1613                 }
1614         putchar('\n');
1615         fflush(stdout);
1616 }
1617
1618 static void
1619 bprintf(FILE *fp, int b, u_char *str)
1620 {
1621         int i;
1622         int gotsome = 0;
1623
1624         if (b == 0)
1625                 return;
1626         while ((i = *str++) != 0) {
1627                 if (b & (1 << (i-1))) {
1628                         if (!gotsome)
1629                                 i = '<';
1630                         else
1631                                 i = ',';
1632                         putc(i, fp);
1633                         gotsome = 1;
1634                         for (; (i = *str) > 32; str++)
1635                                 putc(i, fp);
1636                 } else
1637                         while (*str > 32)
1638                                 str++;
1639         }
1640         if (gotsome)
1641                 putc('>', fp);
1642 }
1643
1644 int
1645 keyword(const char *cp)
1646 {
1647         struct keytab *kt = keywords;
1648
1649         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1650                 kt++;
1651         return(kt->kt_i);
1652 }
1653
1654 static void
1655 sodump(sup su, const char *which)
1656 {
1657         switch (su->sa.sa_family) {
1658         case AF_LINK:
1659                 printf("%s: link %s; ",
1660                     which, link_ntoa(&su->sdl));
1661                 break;
1662         case AF_INET:
1663                 printf("%s: inet %s; ",
1664                     which, inet_ntoa(su->sin.sin_addr));
1665                 break;
1666         case AF_APPLETALK:
1667                 printf("%s: atalk %s; ",
1668                     which, atalk_ntoa(su->sat.sat_addr));
1669                 break;
1670 #ifdef NS
1671         case AF_NS:
1672                 printf("%s: xns %s; ",
1673                     which, ns_ntoa(su->sns.sns_addr));
1674                 break;
1675 #endif
1676         }
1677         fflush(stdout);
1678 }
1679
1680 /* States*/
1681 #define VIRGIN  0
1682 #define GOTONE  1
1683 #define GOTTWO  2
1684 /* Inputs */
1685 #define DIGIT   (4*0)
1686 #define END     (4*1)
1687 #define DELIM   (4*2)
1688
1689 static void
1690 sockaddr(char *addr, struct sockaddr *sa)
1691 {
1692         char *cp = (char *)sa;
1693         int size = sa->sa_len;
1694         char *cplim = cp + size;
1695         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1696
1697         memset(cp, 0, size);
1698         cp++;
1699         do {
1700                 if ((*addr >= '0') && (*addr <= '9')) {
1701                         new = *addr - '0';
1702                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1703                         new = *addr - 'a' + 10;
1704                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1705                         new = *addr - 'A' + 10;
1706                 } else if (*addr == '\0')
1707                         state |= END;
1708                 else
1709                         state |= DELIM;
1710                 addr++;
1711                 switch (state /* | INPUT */) {
1712                 case GOTTWO | DIGIT:
1713                         *cp++ = byte; /*FALLTHROUGH*/
1714                 case VIRGIN | DIGIT:
1715                         state = GOTONE; byte = new; continue;
1716                 case GOTONE | DIGIT:
1717                         state = GOTTWO; byte = new + (byte << 4); continue;
1718                 default: /* | DELIM */
1719                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1720                 case GOTONE | END:
1721                 case GOTTWO | END:
1722                         *cp++ = byte; /* FALLTHROUGH */
1723                 case VIRGIN | END:
1724                         break;
1725                 }
1726                 break;
1727         } while (cp < cplim);
1728         sa->sa_len = cp - (char *)sa;
1729 }
1730
1731 static int
1732 atalk_aton(const char *text, struct at_addr *addr)
1733 {
1734         u_int net, node;
1735
1736         if (sscanf(text, "%u.%u", &net, &node) != 2
1737             || net > 0xffff || node > 0xff)
1738                 return(0);
1739         addr->s_net = htons(net);
1740         addr->s_node = node;
1741         return(1);
1742 }
1743
1744 static char *
1745 atalk_ntoa(struct at_addr at)
1746 {
1747         static char buf[20];
1748
1749         snprintf(buf, sizeof(buf), "%u.%u", ntohs(at.s_net), at.s_node);
1750         return(buf);
1751 }