sbin/route/show.c

   1 /*      $NetBSD: show.c,v 1.38 2008/09/10 01:06:58 dyoung Exp $ */
   2
   3 /*
   4  * Copyright (c) 1983, 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "from: @(#)route.c       8.3 (Berkeley) 3/9/94";
  36 #else
  37 __RCSID("$NetBSD: show.c,v 1.38 2008/09/10 01:06:58 dyoung Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42 #include <sys/protosw.h>
  43 #include <sys/socket.h>
  44 #include <sys/mbuf.h>
  45
  46 #include <net/if.h>
  47 #include <net/if_dl.h>
  48 #include <net/if_types.h>
  49 #include <net/route.h>
  50 #include <netinet/in.h>
  51
  52 #include <sys/sysctl.h>
  53
  54 #include <netdb.h>
  55 #include <stdbool.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60 #include <err.h>
  61
  62 #include "keywords.h"
  63 #include "extern.h"
  64
  65 #define ROUNDUP(a) \
  66         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  67 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  68
  69 /*
  70  * Definitions for showing gateway flags.
  71  */
  72 struct bits {
  73         short   b_mask;
  74         char    b_val;
  75 };
  76 static const struct bits bits[] = {
  77         { RTF_UP,       'U' },
  78         { RTF_GATEWAY,  'G' },
  79         { RTF_HOST,     'H' },
  80         { RTF_REJECT,   'R' },
  81         { RTF_DYNAMIC,  'D' },
  82         { RTF_MODIFIED, 'M' },
  83         { RTF_DONE,     'd' }, /* Completed -- for routing messages only */
  84         { RTF_MASK,     'm' }, /* Mask Present -- for routing messages only */
  85         { RTF_CLONING,  'C' },
  86         { RTF_XRESOLVE, 'X' },
  87         { RTF_LLINFO,   'L' },
  88         { RTF_STATIC,   'S' },
  89         { RTF_BLACKHOLE, 'B' },
  90         { RTF_CLONED,   'c' },
  91         { RTF_PROTO1,   '1' },
  92         { RTF_PROTO2,   '2' },
  93         { 0, '\0' }
  94 };
  95
  96 static void pr_rthdr(int);
  97 static void p_rtentry(struct rt_msghdr *);
  98 static void pr_family(int);
  99 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int );
 100 static void p_flags(int);
 101
 102 void
 103 parse_show_opts(int argc, char * const *argv, int *afp, int *flagsp,
 104     const char **afnamep, bool nolink)
 105 {
 106         const char *afname = "unspec";
 107         int af, flags;
 108
 109         flags = 0;
 110         af = AF_UNSPEC;
 111         for (; argc >= 2; argc--) {
 112                 if (*argv[argc - 1] != '-')
 113                         goto bad;
 114                 switch (keyword(argv[argc - 1] + 1)) {
 115                 case K_HOST:
 116                         flags |= RTF_HOST;
 117                         break;
 118                 case K_LLINFO:
 119                         flags |= RTF_LLINFO;
 120                         break;
 121                 case K_INET:
 122                         af = AF_INET;
 123                         afname = argv[argc - 1] + 1;
 124                         break;
 125 #ifdef INET6
 126                 case K_INET6:
 127                         af = AF_INET6;
 128                         afname = argv[argc - 1] + 1;
 129                         break;
 130 #endif
 131 #ifndef SMALL
 132                 case K_ATALK:
 133                         af = AF_APPLETALK;
 134                         afname = argv[argc - 1] + 1;
 135                         break;
 136                 case K_ISO:
 137                 case K_OSI:
 138                         af = AF_ISO;
 139                         afname = argv[argc - 1] + 1;
 140                         break;
 141 #endif /* SMALL */
 142                 case K_LINK:
 143                         if (nolink)
 144                                 goto bad;
 145                         af = AF_LINK;
 146                         afname = argv[argc - 1] + 1;
 147                         break;
 148                 default:
 149                         goto bad;
 150                 }
 151         }
 152         switch (argc) {
 153         case 1:
 154         case 0:
 155                 break;
 156         default:
 157         bad:
 158                 usage(argv[argc - 1]);
 159         }
 160         if (afnamep != NULL)
 161                 *afnamep = afname;
 162         *afp = af;
 163         *flagsp = flags;
 164 }
 165
 166 /*
 167  * Print routing tables.
 168  */
 169 void
 170 show(int argc, char *const *argv)
 171 {
 172         size_t needed;
 173         int af, flags, mib[6];
 174         char *buf, *next, *lim;
 175         struct rt_msghdr *rtm;
 176         struct sockaddr *sa;
 177
 178         parse_show_opts(argc, argv, &af, &flags, NULL, true);
 179         mib[0] = CTL_NET;
 180         mib[1] = PF_ROUTE;
 181         mib[2] = 0;
 182         mib[3] = 0;
 183         mib[4] = NET_RT_DUMP;
 184         mib[5] = 0;
 185         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
 186                 err(EXIT_FAILURE, "route-sysctl-estimate");
 187         buf = lim = NULL;
 188         if (needed) {
 189                 if ((buf = malloc(needed)) == 0)
 190                         err(EXIT_FAILURE, "malloc");
 191                 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
 192                         err(EXIT_FAILURE, "sysctl of routing table");
 193                 lim  = buf + needed;
 194         }
 195
 196         printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : "");
 197
 198         if (needed) {
 199                 for (next = buf; next < lim; next += rtm->rtm_msglen) {
 200                         rtm = (struct rt_msghdr *)next;
 201                         sa = (struct sockaddr *)(rtm + 1);
 202                         if ((rtm->rtm_flags & flags) != flags)
 203                                 continue;
 204                         if (af == AF_UNSPEC || af == sa->sa_family)
 205                                 p_rtentry(rtm);
 206                 }
 207                 free(buf);
 208         }
 209 }
 210
 211
 212 /* column widths; each followed by one space */
 213 #ifndef INET6
 214 #define WID_DST(af)     18      /* width of destination column */
 215 #define WID_GW(af)      18      /* width of gateway column */
 216 #else
 217 /* width of destination/gateway column */
 218 #if 1
 219 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */
 220 #define WID_DST(af)     ((af) == AF_INET6 ? (nflag ? 34 : 18) : 18)
 221 #define WID_GW(af)      ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18)
 222 #else
 223 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */
 224 #define WID_DST(af)     ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18)
 225 #define WID_GW(af)      ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18)
 226 #endif
 227 #endif /* INET6 */
 228
 229 /*
 230  * Print header for routing table columns.
 231  */
 232 static void
 233 pr_rthdr(int af)
 234 {
 235
 236         printf("%-*.*s %-*.*s %-6.6s\n",
 237                 WID_DST(af), WID_DST(af), "Destination",
 238                 WID_GW(af), WID_GW(af), "Gateway",
 239                 "Flags");
 240 }
 241
 242
 243 /*
 244  * Print a routing table entry.
 245  */
 246 static void
 247 p_rtentry(struct rt_msghdr *rtm)
 248 {
 249         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 250 #ifdef notdef
 251         static int masks_done, banner_printed;
 252 #endif
 253         static int old_af;
 254         int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST |
 255             RTF_REJECT | RTF_LLINFO;
 256
 257 #ifdef notdef
 258         /* for the moment, netmasks are skipped over */
 259         if (!banner_printed) {
 260                 printf("Netmasks:\n");
 261                 banner_printed = 1;
 262         }
 263         if (masks_done == 0) {
 264                 if (rtm->rtm_addrs != RTA_DST ) {
 265                         masks_done = 1;
 266                         af = sa->sa_family;
 267                 }
 268         } else
 269 #endif
 270                 af = sa->sa_family;
 271         if (old_af != af) {
 272                 old_af = af;
 273                 pr_family(af);
 274                 pr_rthdr(af);
 275         }
 276         if (rtm->rtm_addrs == RTA_DST)
 277                 p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1);
 278         else {
 279                 struct sockaddr *nm;
 280
 281                 if ((rtm->rtm_addrs & RTA_NETMASK) == 0)
 282                         nm = NULL;
 283                 else {
 284                         /* skip to gateway */
 285                         nm = (struct sockaddr *)
 286                             (ROUNDUP(sa->sa_len) + (char *)sa);
 287                         /* skip over gateway to netmask */
 288                         nm = (struct sockaddr *)
 289                             (ROUNDUP(nm->sa_len) + (char *)nm);
 290                 }
 291
 292                 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af));
 293                 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
 294                 p_sockaddr(sa, NULL, 0, WID_GW(af));
 295         }
 296         p_flags(rtm->rtm_flags & interesting);
 297         putchar('\n');
 298 }
 299
 300
 301 /*
 302  * Print address family header before a section of the routing table.
 303  */
 304 static void
 305 pr_family(int af)
 306 {
 307         const char *afname;
 308
 309         switch (af) {
 310         case AF_INET:
 311                 afname = "Internet";
 312                 break;
 313 #ifdef INET6
 314         case AF_INET6:
 315                 afname = "Internet6";
 316                 break;
 317 #endif /* INET6 */
 318 #ifndef SMALL
 319         case AF_ISO:
 320                 afname = "ISO";
 321                 break;
 322 #endif /* SMALL */
 323         case AF_APPLETALK:
 324                 afname = "AppleTalk";
 325                 break;
 326         default:
 327                 afname = NULL;
 328                 break;
 329         }
 330         if (afname)
 331                 printf("\n%s:\n", afname);
 332         else
 333                 printf("\nProtocol Family %d:\n", af);
 334 }
 335
 336
 337 static void
 338 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width)
 339 {
 340         char workbuf[128];
 341         const char *cp;
 342
 343         switch(sa->sa_family) {
 344
 345         case AF_LINK:
 346                 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf),
 347                     NULL, 0, NI_NUMERICHOST) != 0)
 348                         strlcpy(workbuf, "invalid", sizeof(workbuf));
 349                 cp = workbuf;
 350                 break;
 351
 352         case AF_INET:
 353                 cp = routename(sa, nm, flags);
 354                 break;
 355
 356 #ifdef INET6
 357         case AF_INET6:
 358                 cp = routename(sa, nm, flags);
 359                 /* make sure numeric address is not truncated */
 360                 if (strchr(cp, ':') != NULL && (int)strlen(cp) > width)
 361                         width = strlen(cp);
 362                 break;
 363 #endif /* INET6 */
 364
 365 #ifndef SMALL
 366 #endif /* SMALL */
 367
 368         default:
 369             {
 370                 u_char *s = (u_char *)sa->sa_data, *slim;
 371                 char *wp = workbuf, *wplim;
 372
 373                 slim = sa->sa_len + (u_char *)sa;
 374                 wplim = wp + sizeof(workbuf) - 6;
 375                 wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family);
 376                 while (s < slim && wp < wplim) {
 377                         wp += snprintf(wp, wplim - wp, " %02x", *s++);
 378                         if (s < slim)
 379                             wp += snprintf(wp, wplim - wp, "%02x", *s++);
 380                 }
 381                 cp = workbuf;
 382             }
 383         }
 384         if (width < 0 )
 385                 printf("%s ", cp);
 386         else {
 387                 if (nflag)
 388                         printf("%-*s ", width, cp);
 389                 else
 390                         printf("%-*.*s ", width, width, cp);
 391         }
 392 }
 393
 394 static void
 395 p_flags(int f)
 396 {
 397         char name[33], *flags;
 398         const struct bits *p = bits;
 399
 400         for (flags = name; p->b_mask; p++)
 401                 if (p->b_mask & f)
 402                         *flags++ = p->b_val;
 403                 else if (Sflag)
 404                         *flags++ = ' ';
 405         *flags = '\0';
 406         printf("%-6.6s ", name);
 407 }
 408