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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1983, 1989, 1991, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)route.c  8.6 (Berkeley) 4/28/95
  31  * $FreeBSD: src/sbin/route/route.c,v 1.40.2.11 2003/02/27 23:10:10 ru Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/file.h>
  36 #include <sys/socket.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/types.h>
  40
  41 #include <net/if.h>
  42 #include <net/route.h>
  43 #include <net/if_dl.h>
  44 #include <netinet/in.h>
  45 #include <netinet/if_ether.h>
  46 #include <arpa/inet.h>
  47 #include <netdb.h>
  48
  49 #include <netproto/mpls/mpls.h>
  50
  51 #include <ctype.h>
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <paths.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <sysexits.h>
  59 #include <unistd.h>
  60 #include <ifaddrs.h>
  61
  62 #include "extern.h"
  63 #include "keywords.h"
  64
  65 union   sockunion {
  66         struct  sockaddr sa;
  67         struct  sockaddr_in sin;
  68 #ifdef INET6
  69         struct  sockaddr_in6 sin6;
  70 #endif
  71         struct  sockaddr_mpls smpls;
  72         struct  sockaddr_dl sdl;
  73         struct  sockaddr_inarp sinarp;
  74         struct  sockaddr_storage ss; /* added to avoid memory overrun */
  75 } so_dst, so_gate, so_mask, so_genmask, so_ifa, so_ifp, so_mpls1,
  76         so_mpls2, so_mpls3;
  77
  78 typedef union sockunion *sup;
  79
  80 int     nflag, wflag;
  81 int     cpuflag = -1;
  82
  83 static struct ortentry route;
  84 static struct rt_metrics rt_metrics;
  85 static int      pid, rtm_addrs;
  86 static int      s;
  87 static int      forcehost, forcenet, af, qflag, tflag;
  88 static int      iflag, verbose, aflen = sizeof(struct sockaddr_in);
  89 static int      locking, lockrest, debugonly;
  90 static int      mplsop, popcount, pushcount, swapcount;
  91 static u_long   rtm_inits;
  92 static uid_t    uid;
  93
  94 static void      flushroutes(int, char **);
  95 static void      set_metric(char *, int);
  96 static void      newroute(int, char **);
  97 static void      inet_makenetandmask(u_long, struct sockaddr_in *, u_long);
  98 static void      interfaces(void);
  99 static void      monitor(void);
 100 static void      sockaddr(const char *, struct sockaddr *);
 101 static void      sodump(sup, const char *);
 102 static void      bprintf(FILE *, int, u_char *);
 103 static void      print_getmsg(struct rt_msghdr *, int);
 104 static void      print_rtmsg(struct rt_msghdr *, int);
 105 static void      pmsg_common(struct rt_msghdr *);
 106 static void      pmsg_addrs(char *, int);
 107 static void      mask_addr(void);
 108 static int       getaddr(int, const char *, struct hostent **);
 109 static int       rtmsg(int, int);
 110 static int       prefixlen(const char *);
 111 #ifdef INET6
 112 static int       inet6_makenetandmask(struct sockaddr_in6 *, const char *);
 113 #endif
 114
 115 void
 116 usage(const char *cp)
 117 {
 118         if (cp != NULL)
 119                 warnx("bad keyword: %s", cp);
 120         fprintf(stderr, "usage: route [-dnqtv] command [[modifiers] args]\n");
 121         exit(EX_USAGE);
 122         /* NOTREACHED */
 123 }
 124
 125 int
 126 main(int argc, char **argv)
 127 {
 128         int ch;
 129
 130         if (argc < 2)
 131                 usage(NULL);
 132
 133         while ((ch = getopt(argc, argv, "c:wnqdtv")) != -1)
 134                 switch(ch) {
 135                 case 'c':
 136                         cpuflag = strtol(optarg, NULL, 0);
 137                         break;
 138                 case 'w':
 139                         wflag = 1;
 140                         break;
 141                 case 'n':
 142                         nflag = 1;
 143                         break;
 144                 case 'q':
 145                         qflag = 1;
 146                         break;
 147                 case 'v':
 148                         verbose = 1;
 149                         break;
 150                 case 't':
 151                         tflag = 1;
 152                         break;
 153                 case 'd':
 154                         debugonly = 1;
 155                         break;
 156                 case '?':
 157                 default:
 158                         usage(NULL);
 159                 }
 160         argc -= optind;
 161         argv += optind;
 162
 163         pid = getpid();
 164         uid = geteuid();
 165         if (tflag)
 166                 s = open(_PATH_DEVNULL, O_WRONLY, 0);
 167         else
 168                 s = socket(PF_ROUTE, SOCK_RAW, 0);
 169         if (s < 0)
 170                 err(EX_OSERR, "socket");
 171         if (*argv != NULL)
 172                 switch (keyword(*argv)) {
 173                 case K_GET:
 174                         uid = 0;
 175                         /* FALLTHROUGH */
 176
 177                 case K_CHANGE:
 178                 case K_ADD:
 179                 case K_DELETE:
 180                         newroute(argc, argv);
 181                         /* NOTREACHED */
 182
 183                 case K_SHOW:
 184                         show(argc, argv);
 185                         return(0);
 186
 187                 case K_MONITOR:
 188                         monitor();
 189                         /* NOTREACHED */
 190
 191                 case K_FLUSH:
 192                         flushroutes(argc, argv);
 193                         exit(0);
 194                         /* NOTREACHED */
 195                 }
 196         usage(*argv);
 197         /* NOTREACHED */
 198 }
 199
 200 /*
 201  * Purge all entries in the routing tables not
 202  * associated with network interfaces.
 203  */
 204 static void
 205 flushroutes(int argc, char **argv)
 206 {
 207         size_t needed;
 208         int mib[7], rlen, seqno;
 209         int miblen;
 210         char *buf, *next, *lim;
 211         struct rt_msghdr *rtm;
 212
 213         if (uid != 0) {
 214                 errx(EX_NOPERM, "must be root to alter routing table");
 215         }
 216         shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 217         if (argc > 1) {
 218                 argv++;
 219                 if (argc == 2 && **argv == '-')
 220                     switch (keyword(*argv + 1)) {
 221                         case K_INET:
 222                                 af = AF_INET;
 223                                 break;
 224 #ifdef INET6
 225                         case K_INET6:
 226                                 af = AF_INET6;
 227                                 break;
 228 #endif
 229                         case K_LINK:
 230                                 af = AF_LINK;
 231                                 break;
 232                         case K_MPLS:
 233                                 af = AF_MPLS;
 234                                 break;
 235                         default:
 236                                 goto bad;
 237                 } else
 238 bad:                    usage(*argv);
 239         }
 240         mib[0] = CTL_NET;
 241         mib[1] = PF_ROUTE;
 242         mib[2] = 0;             /* protocol */
 243         mib[3] = 0;             /* wildcard address family */
 244         mib[4] = NET_RT_DUMP;
 245         mib[5] = 0;             /* no flags */
 246         if (cpuflag >= 0) {
 247                 mib[6] = cpuflag;
 248                 miblen = 7;
 249         } else {
 250                 miblen = 6;
 251         }
 252         if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)
 253                 err(EX_OSERR, "route-sysctl-estimate");
 254         if ((buf = malloc(needed)) == NULL)
 255                 errx(EX_OSERR, "malloc failed");
 256         if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0)
 257                 err(EX_OSERR, "route-sysctl-get");
 258         lim = buf + needed;
 259         if (verbose)
 260                 printf("Examining routing table from sysctl\n");
 261         seqno = 0;              /* ??? */
 262         for (next = buf; next < lim; next += rtm->rtm_msglen) {
 263                 rtm = (struct rt_msghdr *)next;
 264                 if (verbose)
 265                         print_rtmsg(rtm, rtm->rtm_msglen);
 266                 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
 267                         continue;
 268                 if (af != 0) {
 269                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 270
 271                         if (sa->sa_family != af)
 272                                 continue;
 273                 }
 274                 if (debugonly)
 275                         continue;
 276                 rtm->rtm_type = RTM_DELETE;
 277                 rtm->rtm_seq = seqno;
 278                 rlen = write(s, next, rtm->rtm_msglen);
 279                 if (rlen < (int)rtm->rtm_msglen) {
 280                         warn("write to routing socket");
 281                         printf("got only %d for rlen\n", rlen);
 282                         break;
 283                 }
 284                 seqno++;
 285                 if (qflag)
 286                         continue;
 287                 if (verbose) {
 288                         print_rtmsg(rtm, rlen);
 289                 } else {
 290                         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 291                         if (wflag) {
 292                             printf("%-20s ", rtm->rtm_flags & RTF_HOST ?
 293                                 routename(sa) : netname(sa));
 294                         } else {
 295                             printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
 296                                 routename(sa) : netname(sa));
 297                         }
 298                         sa = (struct sockaddr *)(RT_ROUNDUP(sa->sa_len) +
 299                             (char *)sa);
 300                         if (wflag) {
 301                             printf("%-20s ", routename(sa));
 302                         } else {
 303                             printf("%-20.20s ", routename(sa));
 304                         }
 305                         printf("done\n");
 306                 }
 307         }
 308 }
 309
 310 char *
 311 routename(struct sockaddr *sa)
 312 {
 313         const char *cp;
 314         static char line[MAXHOSTNAMELEN + 1];
 315         struct hostent *hp;
 316         static char domain[MAXHOSTNAMELEN + 1];
 317         static int first = 1;
 318
 319         if (first) {
 320                 first = 0;
 321                 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
 322                     (cp = strchr(domain, '.'))) {
 323                         domain[MAXHOSTNAMELEN] = '\0';
 324                         strcpy(domain, cp + 1);
 325                 } else
 326                         domain[0] = 0;
 327         }
 328
 329         if (sa->sa_len == 0)
 330                 strcpy(line, "default");
 331         else switch (sa->sa_family) {
 332
 333         case AF_INET:
 334             {   struct in_addr in;
 335                 in = ((struct sockaddr_in *)sa)->sin_addr;
 336
 337                 cp = NULL;
 338                 if (in.s_addr == INADDR_ANY || sa->sa_len < 4)
 339                         cp = "default";
 340                 if (cp == NULL && !nflag) {
 341                         hp = gethostbyaddr(&in, sizeof(struct in_addr),
 342                                 AF_INET);
 343                         if (hp != NULL) {
 344                                 char *cptr;
 345                                 cptr = strchr(hp->h_name, '.');
 346                                 if (cptr != NULL && !wflag &&
 347                                     strcmp(cptr + 1, domain) == 0)
 348                                         *cptr = '\0';
 349                                 cp = hp->h_name;
 350                         }
 351                 }
 352                 if (cp != NULL) {
 353                         strncpy(line, cp, sizeof(line) - 1);
 354                         line[sizeof(line) - 1] = '\0';
 355                 } else
 356                         sprintf(line, "%s", inet_ntoa(in));
 357                 break;
 358             }
 359
 360 #ifdef INET6
 361         case AF_INET6:
 362         {
 363                 struct sockaddr_in6 sin6; /* use static var for safety */
 364                 int niflags = 0;
 365 #ifdef NI_WITHSCOPEID
 366                 niflags = NI_WITHSCOPEID;
 367 #endif
 368
 369                 memset(&sin6, 0, sizeof(sin6));
 370                 memcpy(&sin6, sa, sa->sa_len);
 371                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 372                 sin6.sin6_family = AF_INET6;
 373 #ifdef __KAME__
 374                 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
 375                     (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 376                      IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
 377                     sin6.sin6_scope_id == 0) {
 378                         sin6.sin6_scope_id =
 379                             ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 380                         sin6.sin6_addr.s6_addr[2] = 0;
 381                         sin6.sin6_addr.s6_addr[3] = 0;
 382                 }
 383 #endif
 384                 if (nflag)
 385                         niflags |= NI_NUMERICHOST;
 386                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 387                     line, sizeof(line), NULL, 0, niflags) != 0)
 388                         strncpy(line, "invalid", sizeof(line));
 389
 390                 return(line);
 391         }
 392 #endif
 393
 394         case AF_LINK:
 395                 return(link_ntoa((struct sockaddr_dl *)sa));
 396
 397         default:
 398             {
 399                 /*
 400                  * Unknown address family; just render the raw
 401                  * data in sa->sa_data as hex values.
 402                  */
 403                 uint8_t *sp = (uint8_t *)sa->sa_data;
 404                 uint8_t *splim = (uint8_t *)sa + sa->sa_len;
 405                 char *cps = line + sprintf(line, "(%d)", sa->sa_family);
 406                 char *cpe = line + sizeof(line);
 407
 408                 while (sp < splim && cps < cpe)
 409                         cps += snprintf(cps, cpe - cps, " %02x", *sp++);
 410                 break;
 411             }
 412         }
 413         return(line);
 414 }
 415
 416 /*
 417  * Return the name of the network whose address is given.
 418  * The address is assumed to be that of a net or subnet, not a host.
 419  */
 420 char *
 421 netname(struct sockaddr *sa)
 422 {
 423         const char *cp = NULL;
 424         static char line[MAXHOSTNAMELEN + 1];
 425         struct netent *np = NULL;
 426         u_long net, mask;
 427         u_long i;
 428         int subnetshift;
 429
 430         switch (sa->sa_family) {
 431
 432         case AF_INET:
 433             {   struct in_addr in;
 434                 in = ((struct sockaddr_in *)sa)->sin_addr;
 435
 436                 i = in.s_addr = ntohl(in.s_addr);
 437                 if (in.s_addr == 0)
 438                         cp = "default";
 439                 else if (!nflag) {
 440                         if (IN_CLASSA(i)) {
 441                                 mask = IN_CLASSA_NET;
 442                                 subnetshift = 8;
 443                         } else if (IN_CLASSB(i)) {
 444                                 mask = IN_CLASSB_NET;
 445                                 subnetshift = 8;
 446                         } else {
 447                                 mask = IN_CLASSC_NET;
 448                                 subnetshift = 4;
 449                         }
 450                         /*
 451                          * If there are more bits than the standard mask
 452                          * would suggest, subnets must be in use.
 453                          * Guess at the subnet mask, assuming reasonable
 454                          * width subnet fields.
 455                          */
 456                         while (in.s_addr &~ mask)
 457                                 mask |= mask >> subnetshift;
 458                         net = in.s_addr & mask;
 459                         while ((mask & 1) == 0)
 460                                 mask >>= 1, net >>= 1;
 461                         np = getnetbyaddr(net, AF_INET);
 462                         if (np != NULL)
 463                                 cp = np->n_name;
 464                 }
 465 #define C(x)    (unsigned)((x) & 0xff)
 466                 if (cp != NULL)
 467                         strncpy(line, cp, sizeof(line));
 468                 else if ((in.s_addr & 0xffffff) == 0)
 469                         sprintf(line, "%u", C(in.s_addr >> 24));
 470                 else if ((in.s_addr & 0xffff) == 0)
 471                         sprintf(line, "%u.%u", C(in.s_addr >> 24),
 472                             C(in.s_addr >> 16));
 473                 else if ((in.s_addr & 0xff) == 0)
 474                         sprintf(line, "%u.%u.%u", C(in.s_addr >> 24),
 475                             C(in.s_addr >> 16), C(in.s_addr >> 8));
 476                 else
 477                         sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
 478                             C(in.s_addr >> 16), C(in.s_addr >> 8),
 479                             C(in.s_addr));
 480 #undef C
 481                 break;
 482             }
 483
 484 #ifdef INET6
 485         case AF_INET6:
 486         {
 487                 struct sockaddr_in6 sin6; /* use static var for safety */
 488                 int niflags = 0;
 489 #ifdef NI_WITHSCOPEID
 490                 niflags = NI_WITHSCOPEID;
 491 #endif
 492
 493                 memset(&sin6, 0, sizeof(sin6));
 494                 memcpy(&sin6, sa, sa->sa_len);
 495                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 496                 sin6.sin6_family = AF_INET6;
 497 #ifdef __KAME__
 498                 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
 499                     (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 500                      IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) &&
 501                     sin6.sin6_scope_id == 0) {
 502                         sin6.sin6_scope_id =
 503                             ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 504                         sin6.sin6_addr.s6_addr[2] = 0;
 505                         sin6.sin6_addr.s6_addr[3] = 0;
 506                 }
 507 #endif
 508                 if (nflag)
 509                         niflags |= NI_NUMERICHOST;
 510                 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 511                     line, sizeof(line), NULL, 0, niflags) != 0)
 512                         strncpy(line, "invalid", sizeof(line));
 513
 514                 return(line);
 515         }
 516 #endif
 517
 518         case AF_LINK:
 519                 return(link_ntoa((struct sockaddr_dl *)sa));
 520
 521
 522         default:
 523             {
 524                 /*
 525                  * Unknown address family; just render the raw
 526                  * data in sa->sa_data as hex values.
 527                  */
 528                 uint8_t *sp = (uint8_t *)sa->sa_data;
 529                 uint8_t *splim = (uint8_t *)sa + sa->sa_len;
 530                 char *cps = line + sprintf(line, "af %d:", sa->sa_family);
 531                 char *cpe = line + sizeof(line);
 532
 533                 while (sp < splim && cps < cpe)
 534                         cps += snprintf(cps, cpe - cps, " %02x", *sp++);
 535                 break;
 536             }
 537         }
 538         return(line);
 539 }
 540
 541 static void
 542 set_metric(char *value, int key)
 543 {
 544         int flag = 0;
 545         u_long noval, *valp = &noval;
 546
 547         switch (key) {
 548 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
 549         caseof(K_MTU, RTV_MTU, rmx_mtu);
 550         caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
 551         caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
 552         caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
 553         caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
 554         caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
 555         caseof(K_RTT, RTV_RTT, rmx_rtt);
 556         caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
 557         caseof(K_MSL, RTV_MSL, rmx_msl);
 558         caseof(K_IWMAX, RTV_IWMAXSEGS, rmx_iwmaxsegs);
 559         caseof(K_IW, RTV_IWCAPSEGS, rmx_iwcapsegs);
 560         }
 561         rtm_inits |= flag;
 562         if (lockrest || locking)
 563                 rt_metrics.rmx_locks |= flag;
 564         if (locking)
 565                 locking = 0;
 566         *valp = atoi(value);
 567 }
 568
 569 static void
 570 newroute(int argc, char **argv)
 571 {
 572         char *cmd;
 573         const char *err_str, *dest = "", *gateway = "";
 574         int ishost = 0, proxy = 0, ret, attempts, oerrno, flags = RTF_STATIC;
 575         int key;
 576         struct hostent *hp = NULL;
 577
 578         if (uid != 0) {
 579                 errx(EX_NOPERM, "must be root to alter routing table");
 580         }
 581         cmd = argv[0];
 582         if (*cmd != 'g')
 583                 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
 584         while (--argc > 0) {
 585                 if (**(++argv)== '-') {
 586                         switch (key = keyword(1 + *argv)) {
 587                         case K_LINK:
 588                                 af = AF_LINK;
 589                                 aflen = sizeof(struct sockaddr_dl);
 590                                 break;
 591                         case K_INET:
 592                                 af = AF_INET;
 593                                 aflen = sizeof(struct sockaddr_in);
 594                                 break;
 595 #ifdef INET6
 596                         case K_INET6:
 597                                 af = AF_INET6;
 598                                 aflen = sizeof(struct sockaddr_in6);
 599                                 break;
 600 #endif
 601                         case K_SA:
 602                                 af = PF_ROUTE;
 603                                 aflen = sizeof(union sockunion);
 604                                 break;
 605                         case K_IFACE:
 606                         case K_INTERFACE:
 607                                 iflag++;
 608                                 break;
 609                         case K_NOSTATIC:
 610                                 flags &= ~RTF_STATIC;
 611                                 break;
 612                         case K_LLINFO:
 613                                 flags |= RTF_LLINFO;
 614                                 break;
 615                         case K_LOCK:
 616                                 locking = 1;
 617                                 break;
 618                         case K_LOCKREST:
 619                                 lockrest = 1;
 620                                 break;
 621                         case K_HOST:
 622                                 forcehost++;
 623                                 break;
 624                         case K_REJECT:
 625                                 flags |= RTF_REJECT;
 626                                 break;
 627                         case K_BLACKHOLE:
 628                                 flags |= RTF_BLACKHOLE;
 629                                 break;
 630                         case K_PROTO1:
 631                                 flags |= RTF_PROTO1;
 632                                 break;
 633                         case K_PROTO2:
 634                                 flags |= RTF_PROTO2;
 635                                 break;
 636                         case K_PROXY:
 637                                 proxy = 1;
 638                                 break;
 639                         case K_CLONING:
 640                                 flags |= RTF_CLONING;
 641                                 break;
 642                         case K_XRESOLVE:
 643                                 flags |= RTF_XRESOLVE;
 644                                 break;
 645                         case K_STATIC:
 646                                 flags |= RTF_STATIC;
 647                                 break;
 648                         case K_IFA:
 649                                 if (--argc == 0)
 650                                         usage(NULL);
 651                                 getaddr(RTA_IFA, *++argv, 0);
 652                                 break;
 653                         case K_IFP:
 654                                 if (--argc == 0)
 655                                         usage(NULL);
 656                                 getaddr(RTA_IFP, *++argv, 0);
 657                                 break;
 658                         case K_GENMASK:
 659                                 if (--argc == 0)
 660                                         usage(NULL);
 661                                 getaddr(RTA_GENMASK, *++argv, 0);
 662                                 break;
 663                         case K_GATEWAY:
 664                                 if (--argc == 0)
 665                                         usage(NULL);
 666                                 getaddr(RTA_GATEWAY, *++argv, 0);
 667                                 break;
 668                         case K_DST:
 669                                 if (--argc == 0)
 670                                         usage(NULL);
 671                                 ishost = getaddr(RTA_DST, *++argv, &hp);
 672                                 dest = *argv;
 673                                 break;
 674                         case K_NETMASK:
 675                                 if (--argc == 0)
 676                                         usage(NULL);
 677                                 getaddr(RTA_NETMASK, *++argv, 0);
 678                                 /* FALLTHROUGH */
 679                         case K_NET:
 680                                 forcenet++;
 681                                 break;
 682                         case K_PREFIXLEN:
 683                                 if (--argc == 0)
 684                                         usage(NULL);
 685                                 if (prefixlen(*++argv) == -1) {
 686                                         forcenet = 0;
 687                                         ishost = 1;
 688                                 } else {
 689                                         forcenet = 1;
 690                                         ishost = 0;
 691                                 }
 692                                 break;
 693                         case K_MPLS:
 694                                 af = AF_MPLS;
 695                                 aflen = sizeof(struct sockaddr_mpls);
 696                                 break;
 697                         case K_POP:
 698                                 flags |= RTF_MPLSOPS;
 699                                 af = AF_MPLS;
 700                                 mplsop = MPLSLOP_POP;
 701                                 switch(++popcount){
 702                                         case 1:
 703                                                 getaddr(RTA_MPLS1, "", 0);
 704                                                 break;
 705                                         case 2:
 706                                                 getaddr(RTA_MPLS2, "", 0);
 707                                                 break;
 708                                         case 3:
 709                                                 getaddr(RTA_MPLS3, "", 0);
 710                                                 break;
 711                                 }
 712                                 break;
 713                         case K_PUSH:
 714                         case K_SWAP:
 715                                 if (popcount > 0) {
 716                                         warnx("Push or swap after pop. Ignoring.");
 717                                         break;
 718                                 }
 719                                 if (key == K_PUSH) {
 720                                         mplsop = MPLSLOP_PUSH;
 721                                         ++pushcount;
 722                                 } else {
 723                                         if (pushcount > 0) {
 724                                                 warnx("Swap after push. Ignoring.");
 725                                                 break;
 726                                         }
 727                                         if (swapcount > 0) {
 728                                                 warnx("Too many swaps. Ignoring.");
 729                                                 break;
 730                                         }
 731                                         mplsop = MPLSLOP_SWAP;
 732                                         ++swapcount;
 733                                 }
 734                                 flags |= RTF_MPLSOPS;
 735                                 af = AF_MPLS;
 736                                 aflen = sizeof(struct sockaddr_mpls);
 737                                 if (--argc == 0)
 738                                         usage(NULL);
 739                                 switch(pushcount + swapcount){
 740                                         case 1:
 741                                                 getaddr(RTA_MPLS1, *++argv, 0);
 742                                                 break;
 743                                         case 2:
 744                                                 getaddr(RTA_MPLS2, *++argv, 0);
 745                                                 break;
 746                                         case 3:
 747                                                 getaddr(RTA_MPLS3, *++argv, 0);
 748                                                 break;
 749                                 }
 750                                 break;
 751                         case K_MTU:
 752                         case K_HOPCOUNT:
 753                         case K_EXPIRE:
 754                         case K_RECVPIPE:
 755                         case K_SENDPIPE:
 756                         case K_SSTHRESH:
 757                         case K_RTT:
 758                         case K_RTTVAR:
 759                         case K_MSL:
 760                         case K_IWMAX:
 761                         case K_IW:
 762                                 if (--argc == 0)
 763                                         usage(NULL);
 764                                 set_metric(*++argv, key);
 765                                 break;
 766                         default:
 767                                 usage(1+*argv);
 768                         }
 769                 } else {
 770                         if ((rtm_addrs & RTA_DST) == 0) {
 771                                 dest = *argv;
 772                                 ishost = getaddr(RTA_DST, *argv, &hp);
 773                         } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
 774                                 gateway = *argv;
 775                                 getaddr(RTA_GATEWAY, *argv, &hp);
 776                         } else {
 777                                 getaddr(RTA_NETMASK, *argv, 0);
 778                                 forcenet = 1;
 779                         }
 780                 }
 781         }
 782         if (forcehost) {
 783                 ishost = 1;
 784 #ifdef INET6
 785                 if (af == AF_INET6) {
 786                         rtm_addrs &= ~RTA_NETMASK;
 787                         memset((void *)&so_mask, 0, sizeof(so_mask));
 788                 }
 789 #endif
 790         }
 791         if (forcenet)
 792                 ishost = 0;
 793         flags |= RTF_UP;
 794         if (ishost)
 795                 flags |= RTF_HOST;
 796         if (iflag == 0)
 797                 flags |= RTF_GATEWAY;
 798         if (proxy) {
 799                 so_dst.sinarp.sin_other = SIN_PROXY;
 800                 flags |= RTF_ANNOUNCE;
 801         }
 802         for (attempts = 1; ; attempts++) {
 803                 errno = 0;
 804                 if ((ret = rtmsg(*cmd, flags)) == 0)
 805                         break;
 806                 if (errno != ENETUNREACH && errno != ESRCH)
 807                         break;
 808                 if (af == AF_INET && *gateway != '\0' &&
 809                     hp != NULL && hp->h_addr_list[1] != NULL) {
 810                         hp->h_addr_list++;
 811                         memmove(&so_gate.sin.sin_addr,
 812                                 hp->h_addr_list[0],
 813                                 MIN((size_t)hp->h_length,
 814                                     sizeof(so_gate.sin.sin_addr)));
 815                 } else
 816                         break;
 817         }
 818         if (*cmd == 'g')
 819                 exit(0);
 820         if (!qflag) {
 821                 oerrno = errno;
 822                 printf("%s %s %s", cmd, ishost? "host" : "net", dest);
 823                 if (*gateway != '\0') {
 824                         printf(": gateway %s", gateway);
 825                         if (attempts > 1 && ret == 0 && af == AF_INET)
 826                             printf(" (%s)",
 827                                 inet_ntoa(((struct sockaddr_in *)&route.rt_gateway)->sin_addr));
 828                 }
 829                 if (ret == 0) {
 830                         printf("\n");
 831                 } else {
 832                         switch (oerrno) {
 833                         case ESRCH:
 834                                 err_str = "not in table";
 835                                 break;
 836                         case EBUSY:
 837                                 err_str = "entry in use";
 838                                 break;
 839                         case ENOBUFS:
 840                                 err_str = "routing table overflow";
 841                                 break;
 842                         case EDQUOT: /* handle recursion avoidance in
 843                                         rt_setgate() */
 844                                 err_str = "gateway uses the same route";
 845                                 break;
 846                         default:
 847                                 err_str = strerror(oerrno);
 848                                 break;
 849                         }
 850                         printf(": %s\n", err_str);
 851                 }
 852         }
 853         exit(ret != 0);
 854 }
 855
 856 static void
 857 inet_makenetandmask(u_long net, struct sockaddr_in *in, u_long bits)
 858 {
 859         u_long addr, mask = 0;
 860         char *cp;
 861
 862         rtm_addrs |= RTA_NETMASK;
 863         /*
 864          * XXX: This approach unable to handle 0.0.0.1/32 correctly
 865          * as inet_network() converts 0.0.0.1 and 1 equally.
 866          */
 867         if (net <= 0xff)
 868                 addr = net << IN_CLASSA_NSHIFT;
 869         else if (net <= 0xffff)
 870                 addr = net << IN_CLASSB_NSHIFT;
 871         else if (net <= 0xffffff)
 872                 addr = net << IN_CLASSC_NSHIFT;
 873         else
 874                 addr = net;
 875
 876         if (bits != 0)
 877                 mask = 0xffffffff << (32 - bits);
 878         else if (net == 0)
 879                 mask = 0;
 880         else if (IN_CLASSA(addr))
 881                 mask = IN_CLASSA_NET;
 882         else if (IN_CLASSB(addr))
 883                 mask = IN_CLASSB_NET;
 884         else if (IN_CLASSC(addr))
 885                 mask = IN_CLASSC_NET;
 886         else if (IN_MULTICAST(addr))
 887                 mask = IN_CLASSD_NET;
 888         else
 889                 mask = 0xffffffff;
 890
 891         in->sin_addr.s_addr = htonl(addr);
 892         in = &so_mask.sin;
 893         in->sin_addr.s_addr = htonl(mask);
 894         in->sin_len = 0;
 895         in->sin_family = 0;
 896         cp = (char *)(&in->sin_addr + 1);
 897         while (*--cp == 0 && cp > (char *)in)
 898                 ;
 899         in->sin_len = 1 + cp - (char *)in;
 900 }
 901
 902 #ifdef INET6
 903 /*
 904  * XXX the function may need more improvement...
 905  */
 906 static int
 907 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
 908 {
 909         struct in6_addr in6;
 910
 911         if (plen == NULL) {
 912                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
 913                     sin6->sin6_scope_id == 0) {
 914                         plen = "0";
 915                 } else if ((sin6->sin6_addr.s6_addr[0] & 0xe0) == 0x20) {
 916                         /* aggregatable global unicast - RFC2374 */
 917                         memset(&in6, 0, sizeof(in6));
 918                         if (memcmp(&sin6->sin6_addr.s6_addr[8],
 919                                    &in6.s6_addr[8], 8) == 0)
 920                                 plen = "64";
 921                 }
 922         }
 923
 924         if (plen == NULL || strcmp(plen, "128") == 0)
 925                 return(1);
 926         rtm_addrs |= RTA_NETMASK;
 927         prefixlen(plen);
 928         return(0);
 929 }
 930 #endif
 931
 932 /*
 933  * Interpret an argument as a network address of some kind,
 934  * returning 1 if a host address, 0 if a network address.
 935  */
 936 static int
 937 getaddr(int which, const char *str, struct hostent **hpp)
 938 {
 939         sup su;
 940         struct hostent *hp;
 941         struct netent *np;
 942         u_long val;
 943         char *q;
 944         int afamily;  /* local copy of af so we can change it */
 945
 946         if (af == 0) {
 947                 af = AF_INET;
 948                 aflen = sizeof(struct sockaddr_in);
 949         }
 950         afamily = af;
 951         rtm_addrs |= which;
 952         switch (which) {
 953         case RTA_DST:
 954                 su = &so_dst;
 955                 break;
 956         case RTA_GATEWAY:
 957                 su = &so_gate;
 958                 if (iflag) {
 959                         struct ifaddrs *ifap, *ifa;
 960                         struct sockaddr_dl *sdl = NULL;
 961
 962                         if (getifaddrs(&ifap))
 963                                 err(1, "getifaddrs");
 964
 965                         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
 966                                 if (ifa->ifa_addr->sa_family != AF_LINK)
 967                                         continue;
 968
 969                                 if (strcmp(str, ifa->ifa_name) != 0)
 970                                         continue;
 971
 972                                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 973                         }
 974                         /* If we found it, then use it */
 975                         if (sdl != NULL) {
 976                                 /*
 977                                  * Copy is safe since we have a
 978                                  * sockaddr_storage member in sockunion{}.
 979                                  * Note that we need to copy before calling
 980                                  * freeifaddrs().
 981                                  *
 982                                  * Interface routes are routed only by their
 983                                  * sdl_index or interface name (we provide
 984                                  * both here), not by the ARP address of the
 985                                  * local interface (alen, slen = 0).
 986                                  */
 987                                 memcpy(&su->sdl, sdl, sdl->sdl_len);
 988                                 su->sdl.sdl_alen = 0;
 989                                 su->sdl.sdl_slen = 0;
 990                         }
 991                         freeifaddrs(ifap);
 992                         if (sdl != NULL)
 993                                 return(1);
 994                 }
 995                 break;
 996         case RTA_NETMASK:
 997                 su = &so_mask;
 998                 break;
 999         case RTA_GENMASK:
1000                 su = &so_genmask;
1001                 break;
1002         case RTA_IFP:
1003                 su = &so_ifp;
1004                 afamily = AF_LINK;
1005                 break;
1006         case RTA_IFA:
1007                 su = &so_ifa;
1008                 break;
1009         case RTA_MPLS1:
1010                 su = &so_mpls1;
1011                 break;
1012         case RTA_MPLS2:
1013                 su = &so_mpls2;
1014                 break;
1015         case RTA_MPLS3:
1016                 su = &so_mpls3;
1017                 break;
1018         default:
1019                 usage("internal error");
1020                 /*NOTREACHED*/
1021         }
1022         su->sa.sa_len = aflen;
1023         su->sa.sa_family = afamily; /* cases that don't want it have left
1024                                        already */
1025         if (strcmp(str, "default") == 0) {
1026                 /*
1027                  * Default is net 0.0.0.0/0
1028                  */
1029                 switch (which) {
1030                 case RTA_DST:
1031                         forcenet++;
1032                         /* bzero(su, sizeof(*su)); *//* for readability */
1033                         getaddr(RTA_NETMASK, str, 0);
1034                         break;
1035                 case RTA_NETMASK:
1036                 case RTA_GENMASK:
1037                         /* bzero(su, sizeof(*su)); *//* for readability */
1038                         break;
1039                 }
1040                 return(0);
1041         }
1042         switch (afamily) {
1043 #ifdef INET6
1044         case AF_INET6:
1045         {
1046                 struct addrinfo hints, *res;
1047
1048                 q = NULL;
1049                 if (which == RTA_DST && (q = strchr(str, '/')) != NULL)
1050                         *q = '\0';
1051                 memset(&hints, 0, sizeof(hints));
1052                 hints.ai_family = afamily;      /*AF_INET6*/
1053                 hints.ai_flags = AI_NUMERICHOST;
1054                 hints.ai_socktype = SOCK_DGRAM;         /*dummy*/
1055                 if (getaddrinfo(str, "0", &hints, &res) != 0 ||
1056                     res->ai_family != AF_INET6 ||
1057                     res->ai_addrlen != sizeof(su->sin6)) {
1058                         fprintf(stderr, "%s: bad value\n", str);
1059                         exit(1);
1060                 }
1061                 memcpy(&su->sin6, res->ai_addr, sizeof(su->sin6));
1062 #ifdef __KAME__
1063                 if ((IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr) ||
1064                      IN6_IS_ADDR_LINKLOCAL(&su->sin6.sin6_addr)) &&
1065                     su->sin6.sin6_scope_id) {
1066                         *(u_int16_t *)&su->sin6.sin6_addr.s6_addr[2] =
1067                                 htons(su->sin6.sin6_scope_id);
1068                         su->sin6.sin6_scope_id = 0;
1069                 }
1070 #endif
1071                 freeaddrinfo(res);
1072                 if (q != NULL)
1073                         *q++ = '/';
1074                 if (which == RTA_DST)
1075                         return(inet6_makenetandmask(&su->sin6, q));
1076                 return(0);
1077         }
1078 #endif /* INET6 */
1079
1080         case AF_LINK:
1081                 link_addr(str, &su->sdl);
1082                 return(1);
1083
1084         case PF_ROUTE:
1085                 su->sa.sa_len = sizeof(*su);
1086                 sockaddr(str, &su->sa);
1087                 return(1);
1088
1089         case AF_MPLS:
1090         {
1091                 mpls_label_t label;
1092
1093                 bzero(su, sizeof(*su));
1094                 su->sa.sa_len = sizeof(*su);
1095                 su->sa.sa_family = AF_MPLS;
1096                 su->smpls.smpls_op = mplsop;
1097                 if (mplsop != MPLSLOP_POP && mplsop != MPLSLOP_POPALL &&
1098                     *str != '\0') {
1099                         if (sscanf(str, "%u", &label) != 1)
1100                                 errx(EX_NOHOST, "bad address: %s", str);
1101                         su->smpls.smpls_label = htonl(label);
1102                 }
1103                 return(1);
1104         }
1105
1106         case AF_INET:
1107         default:
1108                 break;
1109         }
1110
1111         if (hpp == NULL)
1112                 hpp = &hp;
1113         *hpp = NULL;
1114
1115         q = strchr(str,'/');
1116         if (q != NULL && which == RTA_DST) {
1117                 *q = '\0';
1118                 if ((val = inet_network(str)) != INADDR_NONE) {
1119                         inet_makenetandmask(
1120                                 val, &su->sin, strtoul(q+1, 0, 0));
1121                         return(0);
1122                 }
1123                 *q = '/';
1124         }
1125         if ((which != RTA_DST || forcenet == 0) &&
1126             inet_aton(str, &su->sin.sin_addr)) {
1127                 val = su->sin.sin_addr.s_addr;
1128                 if (which != RTA_DST ||
1129                     inet_lnaof(su->sin.sin_addr) != INADDR_ANY)
1130                         return(1);
1131                 else {
1132                         val = ntohl(val);
1133                         goto netdone;
1134                 }
1135         }
1136         if (which == RTA_DST && forcehost == 0 &&
1137             ((val = inet_network(str)) != INADDR_NONE ||
1138             ((np = getnetbyname(str)) != NULL && (val = np->n_net) != 0))) {
1139 netdone:
1140                 inet_makenetandmask(val, &su->sin, 0);
1141                 return(0);
1142         }
1143         hp = gethostbyname(str);
1144         if (hp != NULL) {
1145                 *hpp = hp;
1146                 su->sin.sin_family = hp->h_addrtype;
1147                 memmove((char *)&su->sin.sin_addr, hp->h_addr,
1148                     MIN((size_t)hp->h_length, sizeof(su->sin.sin_addr)));
1149                 return(1);
1150         }
1151         errx(EX_NOHOST, "bad address: %s", str);
1152 }
1153
1154 static int
1155 prefixlen(const char *len_str)
1156 {
1157         int len = atoi(len_str), q, r;
1158         int max;
1159         char *p;
1160
1161         rtm_addrs |= RTA_NETMASK;
1162         switch (af) {
1163 #ifdef INET6
1164         case AF_INET6:
1165                 max = 128;
1166                 p = (char *)&so_mask.sin6.sin6_addr;
1167                 break;
1168 #endif
1169         case AF_INET:
1170                 max = 32;
1171                 p = (char *)&so_mask.sin.sin_addr;
1172                 break;
1173         default:
1174                 fprintf(stderr, "prefixlen not supported in this af\n");
1175                 exit(1);
1176                 /*NOTREACHED*/
1177         }
1178
1179         if (len < 0 || max < len) {
1180                 fprintf(stderr, "%s: bad value\n", len_str);
1181                 exit(1);
1182         }
1183
1184         q = len >> 3;
1185         r = len & 7;
1186         so_mask.sa.sa_family = af;
1187         so_mask.sa.sa_len = aflen;
1188         memset((void *)p, 0, max / 8);
1189         if (q > 0)
1190                 memset((void *)p, 0xff, q);
1191         if (r > 0)
1192                 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1193         if (len == max)
1194                 return(-1);
1195         else
1196                 return(len);
1197 }
1198
1199 static void
1200 interfaces(void)
1201 {
1202         size_t needed;
1203         int mib[6];
1204         char *buf, *lim, *next;
1205         struct rt_msghdr *rtm;
1206
1207         mib[0] = CTL_NET;
1208         mib[1] = PF_ROUTE;
1209         mib[2] = 0;             /* protocol */
1210         mib[3] = 0;             /* wildcard address family */
1211         mib[4] = NET_RT_IFLIST;
1212         mib[5] = 0;             /* no flags */
1213         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
1214                 err(EX_OSERR, "route-sysctl-estimate");
1215         if ((buf = malloc(needed)) == NULL)
1216                 errx(EX_OSERR, "malloc failed");
1217         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
1218                 err(EX_OSERR, "actual retrieval of interface table");
1219         lim = buf + needed;
1220         for (next = buf; next < lim; next += rtm->rtm_msglen) {
1221                 rtm = (struct rt_msghdr *)next;
1222                 print_rtmsg(rtm, rtm->rtm_msglen);
1223         }
1224 }
1225
1226 static void
1227 monitor(void)
1228 {
1229         int n;
1230         char msg[2048];
1231
1232         verbose = 1;
1233         if (debugonly) {
1234                 interfaces();
1235                 exit(0);
1236         }
1237         for (;;) {
1238                 time_t now;
1239                 n = read(s, msg, 2048);
1240                 now = time(NULL);
1241                 printf("\ngot message of size %d on %s", n, ctime(&now));
1242                 print_rtmsg((struct rt_msghdr *)msg, n);
1243         }
1244 }
1245
1246 struct {
1247         struct  rt_msghdr m_rtm;
1248         char    m_space[512];
1249 } m_rtmsg;
1250
1251 static int
1252 rtmsg(int cmd, int flags)
1253 {
1254         static int seq;
1255         int rlen;
1256         char *cp = m_rtmsg.m_space;
1257         int l;
1258
1259 #define NEXTADDR(w, u) \
1260         if (rtm_addrs & (w)) {\
1261             l = RT_ROUNDUP(u.sa.sa_len); memmove(cp, &(u), l); cp += l;\
1262             if (verbose) sodump(&(u),"u");\
1263         }
1264
1265         errno = 0;
1266         memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1267         if (cmd == 'a')
1268                 cmd = RTM_ADD;
1269         else if (cmd == 'c')
1270                 cmd = RTM_CHANGE;
1271         else if (cmd == 'g') {
1272                 cmd = RTM_GET;
1273                 if (so_ifp.sa.sa_family == 0) {
1274                         so_ifp.sa.sa_family = AF_LINK;
1275                         so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
1276                         rtm_addrs |= RTA_IFP;
1277                 }
1278         } else
1279                 cmd = RTM_DELETE;
1280 #define rtm m_rtmsg.m_rtm
1281         rtm.rtm_type = cmd;
1282         rtm.rtm_flags = flags;
1283         rtm.rtm_version = RTM_VERSION;
1284         rtm.rtm_seq = ++seq;
1285         rtm.rtm_addrs = rtm_addrs;
1286         rtm.rtm_rmx = rt_metrics;
1287         rtm.rtm_inits = rtm_inits;
1288
1289         if (rtm_addrs & RTA_NETMASK)
1290                 mask_addr();
1291         NEXTADDR(RTA_DST, so_dst);
1292         NEXTADDR(RTA_GATEWAY, so_gate);
1293         NEXTADDR(RTA_NETMASK, so_mask);
1294         NEXTADDR(RTA_GENMASK, so_genmask);
1295         NEXTADDR(RTA_IFP, so_ifp);
1296         NEXTADDR(RTA_IFA, so_ifa);
1297         NEXTADDR(RTA_MPLS1, so_mpls1);
1298         NEXTADDR(RTA_MPLS2, so_mpls2);
1299         NEXTADDR(RTA_MPLS3, so_mpls3);
1300         rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1301         if (verbose)
1302                 print_rtmsg(&rtm, l);
1303         if (debugonly)
1304                 return(0);
1305         if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1306                 warn("writing to routing socket");
1307                 return(-1);
1308         }
1309         if (cmd == RTM_GET) {
1310                 do {
1311                         l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1312                 } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
1313                 if (l < 0)
1314                         warn("read from routing socket");
1315                 else
1316                         print_getmsg(&rtm, l);
1317         }
1318 #undef rtm
1319         return(0);
1320 }
1321
1322 static void
1323 mask_addr(void)
1324 {
1325         int olen = so_mask.sa.sa_len;
1326         char *cp1 = olen + (char *)&so_mask, *cp2;
1327
1328         for (so_mask.sa.sa_len = 0; cp1 > (char *)&so_mask; )
1329                 if (*--cp1 != 0) {
1330                         so_mask.sa.sa_len = 1 + cp1 - (char *)&so_mask;
1331                         break;
1332                 }
1333         if ((rtm_addrs & RTA_DST) == 0)
1334                 return;
1335         switch (so_dst.sa.sa_family) {
1336         case AF_INET:
1337 #ifdef INET6
1338         case AF_INET6:
1339 #endif
1340         case 0:
1341                 return;
1342         }
1343         cp1 = so_mask.sa.sa_len + 1 + (char *)&so_dst;
1344         cp2 = so_dst.sa.sa_len + 1 + (char *)&so_dst;
1345         while (cp2 > cp1)
1346                 *--cp2 = 0;
1347         cp2 = so_mask.sa.sa_len + 1 + (char *)&so_mask;
1348         while (cp1 > so_dst.sa.sa_data)
1349                 *--cp1 &= *--cp2;
1350 }
1351
1352 const char *msgtypes[] = {
1353         "",
1354         "RTM_ADD: Add Route",
1355         "RTM_DELETE: Delete Route",
1356         "RTM_CHANGE: Change Metrics or flags",
1357         "RTM_GET: Report Metrics",
1358         "RTM_LOSING: Kernel Suspects Partitioning",
1359         "RTM_REDIRECT: Told to use different route",
1360         "RTM_MISS: Lookup failed on this address",
1361         "RTM_LOCK: fix specified metrics",
1362         "RTM_OLDADD: caused by SIOCADDRT",
1363         "RTM_OLDDEL: caused by SIOCDELRT",
1364         "RTM_RESOLVE: Route created by cloning",
1365         "RTM_NEWADDR: address being added to iface",
1366         "RTM_DELADDR: address being removed from iface",
1367         "RTM_IFINFO: iface status change",
1368         "RTM_NEWMADDR: new multicast group membership on iface",
1369         "RTM_DELMADDR: multicast group membership removed from iface",
1370         "RTM_IFANNOUNCE: interface arrival/departure",
1371         0,
1372 };
1373
1374 char metricnames[] =
1375 "\013iw\012iwmax\011msl\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire"
1376 "\2hopcount\1mtu";
1377 char routeflags[] =
1378 "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE\010MASK_PRESENT"
1379 "\011CLONING\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE\016b016"
1380 "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3\024CHAINDELETE"
1381 "\025PINNED\026LOCAL\027BROADCAST\030MULTICAST";
1382 char ifnetflags[] =
1383 "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1384 "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1385 "\017LINK2\020MULTICAST";
1386 char addrnames[] =
1387 "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD"
1388 "\011MPLS1\012MPLS2\013MPLS3";
1389
1390 static void
1391 print_rtmsg(struct rt_msghdr *rtm, int msglen __unused)
1392 {
1393         struct if_msghdr *ifm;
1394         struct ifa_msghdr *ifam;
1395 #ifdef RTM_NEWMADDR
1396         struct ifma_msghdr *ifmam;
1397 #endif
1398         struct if_announcemsghdr *ifan;
1399
1400         if (verbose == 0)
1401                 return;
1402         if (rtm->rtm_version != RTM_VERSION) {
1403                 printf("routing message version %d not understood\n",
1404                     rtm->rtm_version);
1405                 return;
1406         }
1407         if (msgtypes[rtm->rtm_type] != NULL)
1408                 printf("%s: ", msgtypes[rtm->rtm_type]);
1409         else
1410                 printf("#%d: ", rtm->rtm_type);
1411         printf("len %d, ", rtm->rtm_msglen);
1412         switch (rtm->rtm_type) {
1413         case RTM_IFINFO:
1414                 ifm = (struct if_msghdr *)rtm;
1415                 printf("if# %d, flags:", ifm->ifm_index);
1416                 bprintf(stdout, ifm->ifm_flags, ifnetflags);
1417                 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs);
1418                 break;
1419         case RTM_NEWADDR:
1420         case RTM_DELADDR:
1421                 ifam = (struct ifa_msghdr *)rtm;
1422                 printf("metric %d, flags:", ifam->ifam_metric);
1423                 bprintf(stdout, ifam->ifam_flags, routeflags);
1424                 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs);
1425                 break;
1426 #ifdef RTM_NEWMADDR
1427         case RTM_NEWMADDR:
1428         case RTM_DELMADDR:
1429                 ifmam = (struct ifma_msghdr *)rtm;
1430                 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs);
1431                 break;
1432 #endif
1433         case RTM_IFANNOUNCE:
1434                 ifan = (struct if_announcemsghdr *)rtm;
1435                 printf("if# %d, what: ", ifan->ifan_index);
1436                 switch (ifan->ifan_what) {
1437                 case IFAN_ARRIVAL:
1438                         printf("arrival");
1439                         break;
1440                 case IFAN_DEPARTURE:
1441                         printf("departure");
1442                         break;
1443                 default:
1444                         printf("#%d", ifan->ifan_what);
1445                         break;
1446                 }
1447                 printf("\n");
1448                 break;
1449
1450         default:
1451                 printf("pid: %ld, seq %d, errno %d, flags:",
1452                         (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1453                 bprintf(stdout, rtm->rtm_flags, routeflags);
1454                 pmsg_common(rtm);
1455         }
1456 }
1457
1458 static void
1459 print_getmsg(struct rt_msghdr *rtm, int msglen)
1460 {
1461         struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
1462         struct sockaddr_dl *ifp = NULL;
1463         struct sockaddr *sa;
1464         char *cp;
1465         int i;
1466
1467         printf("   route to: %s\n", routename(&so_dst.sa));
1468         if (rtm->rtm_version != RTM_VERSION) {
1469                 warnx("routing message version %d not understood",
1470                      rtm->rtm_version);
1471                 return;
1472         }
1473         if (rtm->rtm_msglen > msglen) {
1474                 warnx("message length mismatch, in packet %d, returned %d",
1475                       rtm->rtm_msglen, msglen);
1476         }
1477         if (rtm->rtm_errno != 0)  {
1478                 errno = rtm->rtm_errno;
1479                 warn("message indicates error %d", errno);
1480                 return;
1481         }
1482         cp = ((char *)(rtm + 1));
1483         if (rtm->rtm_addrs)
1484                 for (i = 1; i != 0; i <<= 1)
1485                         if (i & rtm->rtm_addrs) {
1486                                 sa = (struct sockaddr *)cp;
1487                                 switch (i) {
1488                                 case RTA_DST:
1489                                         dst = sa;
1490                                         break;
1491                                 case RTA_GATEWAY:
1492                                         gate = sa;
1493                                         break;
1494                                 case RTA_NETMASK:
1495                                         mask = sa;
1496                                         break;
1497                                 case RTA_IFP:
1498                                         if (sa->sa_family == AF_LINK &&
1499                                            ((struct sockaddr_dl *)sa)->sdl_nlen)
1500                                                 ifp = (struct sockaddr_dl *)sa;
1501                                         break;
1502                                 }
1503                                 RT_ADVANCE(cp, sa);
1504                         }
1505         if (dst != NULL && mask != NULL)
1506                 mask->sa_family = dst->sa_family;       /* XXX */
1507         if (dst != NULL)
1508                 printf("destination: %s\n", routename(dst));
1509         if (mask != NULL) {
1510                 int savenflag = nflag;
1511
1512                 nflag = 1;
1513                 printf("       mask: %s\n", routename(mask));
1514                 nflag = savenflag;
1515         }
1516         if (gate != NULL && rtm->rtm_flags & RTF_GATEWAY)
1517                 printf("    gateway: %s\n", routename(gate));
1518         if (ifp != NULL)
1519                 printf("  interface: %.*s\n",
1520                     ifp->sdl_nlen, ifp->sdl_data);
1521         printf("      flags: ");
1522         bprintf(stdout, rtm->rtm_flags, routeflags);
1523
1524 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1525 #define msec(u) (((u) + 500) / 1000)            /* usec to msec */
1526
1527         printf("\n%s\n", "\
1528  recvpipe  sendpipe  ssthresh  rtt,msec    rttvar  hopcount      mtu     expire  msl,msec iwmax iw");
1529         printf("%8ld%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1530         printf("%8ld%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1531         printf("%8ld%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1532         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1533         printf("%8ld%c ", msec(rtm->rtm_rmx.rmx_rttvar), lock(RTTVAR));
1534         printf("%8ld%c ", rtm->rtm_rmx.rmx_hopcount, lock(HOPCOUNT));
1535         printf("%8ld%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1536         if (rtm->rtm_rmx.rmx_expire != 0) {
1537                 struct timespec sp;
1538                 clock_gettime(CLOCK_MONOTONIC, &sp);
1539                 rtm->rtm_rmx.rmx_expire -= sp.tv_sec;
1540         }
1541         printf("%8ld%c ", rtm->rtm_rmx.rmx_expire, lock(EXPIRE));
1542         printf("%8ld ", rtm->rtm_rmx.rmx_msl);
1543         printf("%5ld ", rtm->rtm_rmx.rmx_iwmaxsegs);
1544         printf("%3ld\n", rtm->rtm_rmx.rmx_iwcapsegs);
1545 #undef lock
1546 #undef msec
1547 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1548         if (verbose)
1549                 pmsg_common(rtm);
1550         else if (rtm->rtm_addrs &~ RTA_IGN) {
1551                 printf("sockaddrs: ");
1552                 bprintf(stdout, rtm->rtm_addrs, addrnames);
1553                 putchar('\n');
1554         }
1555 #undef  RTA_IGN
1556 }
1557
1558 static void
1559 pmsg_common(struct rt_msghdr *rtm)
1560 {
1561         printf("\nlocks: ");
1562         bprintf(stdout, rtm->rtm_rmx.rmx_locks, metricnames);
1563         printf(" inits: ");
1564         bprintf(stdout, rtm->rtm_inits, metricnames);
1565         pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs);
1566 }
1567
1568 static void
1569 pmsg_addrs(char *cp, int addrs)
1570 {
1571         struct sockaddr *sa;
1572         int i;
1573
1574         if (addrs == 0) {
1575                 putchar('\n');
1576                 return;
1577         }
1578         printf("\nsockaddrs: ");
1579         bprintf(stdout, addrs, addrnames);
1580         putchar('\n');
1581         for (i = 1; i != 0; i <<= 1)
1582                 if (i & addrs) {
1583                         sa = (struct sockaddr *)cp;
1584                         printf(" %s", routename(sa));
1585                         RT_ADVANCE(cp, sa);
1586                 }
1587         putchar('\n');
1588         fflush(stdout);
1589 }
1590
1591 static void
1592 bprintf(FILE *fp, int b, u_char *str)
1593 {
1594         int i;
1595         int gotsome = 0;
1596
1597         if (b == 0)
1598                 return;
1599         while ((i = *str++) != 0) {
1600                 if (b & (1 << (i-1))) {
1601                         if (!gotsome)
1602                                 i = '<';
1603                         else
1604                                 i = ',';
1605                         putc(i, fp);
1606                         gotsome = 1;
1607                         for (; (i = *str) > 32; str++)
1608                                 putc(i, fp);
1609                 } else
1610                         while (*str > 32)
1611                                 str++;
1612         }
1613         if (gotsome)
1614                 putc('>', fp);
1615 }
1616
1617 int
1618 keyword(const char *cp)
1619 {
1620         struct keytab *kt = keywords;
1621
1622         while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1623                 kt++;
1624         return(kt->kt_i);
1625 }
1626
1627 static void
1628 sodump(sup su, const char *which)
1629 {
1630         switch (su->sa.sa_family) {
1631         case AF_LINK:
1632                 printf("%s: link %s; ",
1633                     which, link_ntoa(&su->sdl));
1634                 break;
1635         case AF_INET:
1636                 printf("%s: inet %s; ",
1637                     which, inet_ntoa(su->sin.sin_addr));
1638                 break;
1639         }
1640         fflush(stdout);
1641 }
1642
1643 /* States*/
1644 #define VIRGIN  0
1645 #define GOTONE  1
1646 #define GOTTWO  2
1647 /* Inputs */
1648 #define DIGIT   (4*0)
1649 #define END     (4*1)
1650 #define DELIM   (4*2)
1651
1652 static void
1653 sockaddr(const char *addr, struct sockaddr *sa)
1654 {
1655         char *cp = (char *)sa;
1656         int size = sa->sa_len;
1657         char *cplim = cp + size;
1658         int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
1659
1660         memset(cp, 0, size);
1661         cp++;
1662         do {
1663                 if ((*addr >= '0') && (*addr <= '9')) {
1664                         new = *addr - '0';
1665                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
1666                         new = *addr - 'a' + 10;
1667                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
1668                         new = *addr - 'A' + 10;
1669                 } else if (*addr == '\0')
1670                         state |= END;
1671                 else
1672                         state |= DELIM;
1673                 addr++;
1674                 switch (state /* | INPUT */) {
1675                 case GOTTWO | DIGIT:
1676                         *cp++ = byte; /*FALLTHROUGH*/
1677                 case VIRGIN | DIGIT:
1678                         state = GOTONE; byte = new; continue;
1679                 case GOTONE | DIGIT:
1680                         state = GOTTWO; byte = new + (byte << 4); continue;
1681                 default: /* | DELIM */
1682                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
1683                 case GOTONE | END:
1684                 case GOTTWO | END:
1685                         *cp++ = byte; /* FALLTHROUGH */
1686                 case VIRGIN | END:
1687                         break;
1688                 }
1689                 break;
1690         } while (cp < cplim);
1691         sa->sa_len = cp - (char *)sa;
1692 }