sbin/route/show.c

   1 /*
   2  * $OpenBSD: show.c,v 1.26 2003/08/26 08:33:12 itojun Exp $
   3  * $NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $
   4  */
   5 /*
   6  * Copyright (c) 1983, 1988, 1993
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. 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
  34 #include <sys/param.h>
  35 #include <sys/protosw.h>
  36 #include <sys/socket.h>
  37 #include <sys/mbuf.h>
  38
  39 #include <net/if.h>
  40 #include <net/if_dl.h>
  41 #include <net/if_types.h>
  42 #include <net/route.h>
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45
  46 #include <sys/sysctl.h>
  47
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #include <netdb.h>
  54
  55 #include "extern.h"
  56
  57 /*
  58  * Definitions for showing gateway flags.
  59  */
  60 struct bits {
  61         int     b_mask;
  62         char    b_val;
  63 };
  64 static const struct bits bits[] = {
  65         { RTF_UP,       'U' },
  66         { RTF_GATEWAY,  'G' },
  67         { RTF_HOST,     'H' },
  68         { RTF_REJECT,   'R' },
  69         { RTF_BLACKHOLE, 'B' },
  70         { RTF_DYNAMIC,  'D' },
  71         { RTF_MODIFIED, 'M' },
  72         { RTF_DONE,     'd' }, /* Completed -- for routing messages only */
  73         { RTF_CLONING,  'C' },
  74         { RTF_XRESOLVE, 'X' },
  75         { RTF_LLINFO,   'L' },
  76         { RTF_STATIC,   'S' },
  77         { RTF_PROTO1,   '1' },
  78         { RTF_PROTO2,   '2' },
  79         { RTF_PROTO3,   '3' },
  80         { 0, 0 }
  81 };
  82
  83 static __unused struct keytab {
  84         const char      *kt_cp;
  85         int     kt_i;
  86 } const keywords[] = {
  87 #include "keywords.h"
  88         {0, 0}
  89 };
  90
  91 static void     p_rtentry(struct rt_msghdr *);
  92 static int      p_sockaddr(struct sockaddr *, int, int);
  93 static void     p_flags(int, const char *);
  94 static void     pr_rthdr(void);
  95 static void     pr_family(int);
  96
  97 /*
  98  * Print routing tables.
  99  */
 100 void
 101 show(int argc, char *argv[])
 102 {
 103         struct rt_msghdr *rtm;
 104         char *buf = NULL, *next, *lim = NULL;
 105         size_t needed;
 106         int mib[7], af = 0;
 107         int miblen;
 108         struct sockaddr *sa;
 109
 110         if (argc > 1) {
 111                 argv++;
 112                 if (argc == 2 && **argv == '-') {
 113                     switch (keyword(*argv + 1)) {
 114                         case K_INET:
 115                                 af = AF_INET;
 116                                 break;
 117 #ifdef INET6
 118                         case K_INET6:
 119                                 af = AF_INET6;
 120                                 break;
 121 #endif
 122                         case K_LINK:
 123                                 af = AF_LINK;
 124                                 break;
 125                         case K_X25:
 126                                 af = AF_CCITT;
 127                                 break;
 128                         default:
 129                                 goto bad;
 130                     }
 131                 } else
 132 bad:                    usage(*argv);
 133         }
 134         mib[0] = CTL_NET;
 135         mib[1] = PF_ROUTE;
 136         mib[2] = 0;
 137         mib[3] = 0;
 138         mib[4] = NET_RT_DUMP;
 139         mib[5] = 0;
 140         if (cpuflag >= 0) {
 141                 mib[6] = cpuflag;
 142                 miblen = 7;
 143         } else {
 144                 miblen = 6;
 145         }
 146         if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)    {
 147                 perror("route-sysctl-estimate");
 148                 exit(1);
 149         }
 150         if (needed > 0) {
 151                 if ((buf = malloc(needed)) == NULL) {
 152                         printf("out of space\n");
 153                         exit(1);
 154                 }
 155                 if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) {
 156                         perror("sysctl of routing table");
 157                         exit(1);
 158                 }
 159                 lim  = buf + needed;
 160         }
 161
 162         printf("Routing tables\n");
 163
 164         if (buf != NULL) {
 165                 for (next = buf; next < lim; next += rtm->rtm_msglen) {
 166                         rtm = (struct rt_msghdr *)next;
 167                         sa = (struct sockaddr *)(rtm + 1);
 168                         if (af != 0 && sa->sa_family != af)
 169                                 continue;
 170                         p_rtentry(rtm);
 171                 }
 172                 free(buf);
 173         }
 174 }
 175
 176 /* column widths; each followed by one space */
 177 #define WID_DST         (nflag ? 20 : 32)       /* destination column width */
 178 #define WID_GW          (nflag ? 20 : 32)       /* gateway column width */
 179
 180 /*
 181  * Print header for routing table columns.
 182  */
 183 static void
 184 pr_rthdr(void)
 185 {
 186         printf("%-*.*s %-*.*s %-6.6s\n",
 187             WID_DST, WID_DST, "Destination",
 188             WID_GW, WID_GW, "Gateway",
 189             "Flags");
 190 }
 191
 192 /*
 193  * Print a routing table entry.
 194  */
 195 static void
 196 p_rtentry(struct rt_msghdr *rtm)
 197 {
 198         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 199 #ifdef notdef
 200         static int masks_done, banner_printed;
 201 #endif
 202         static int old_af;
 203         int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
 204         int width;
 205
 206 #ifdef notdef
 207         /* for the moment, netmasks are skipped over */
 208         if (!banner_printed) {
 209                 printf("Netmasks:\n");
 210                 banner_printed = 1;
 211         }
 212         if (masks_done == 0) {
 213                 if (rtm->rtm_addrs != RTA_DST) {
 214                         masks_done = 1;
 215                         af = sa->sa_family;
 216                 }
 217         } else
 218 #endif
 219                 af = sa->sa_family;
 220         if (old_af != af) {
 221                 old_af = af;
 222                 pr_family(af);
 223                 pr_rthdr();
 224         }
 225
 226         /*
 227          * Print the information.  If wflag is set p_sockaddr() can return
 228          * a wider width then specified and we try to fit the second
 229          * address in any remaining space so the flags still lines up.
 230          */
 231         if (rtm->rtm_addrs == RTA_DST) {
 232                 p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
 233         } else {
 234                 width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
 235                 sa = (struct sockaddr *)(RT_ROUNDUP(sa->sa_len) + (char *)sa);
 236                 p_sockaddr(sa, 0, WID_GW + WID_DST - width);
 237         }
 238         p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
 239         putchar('\n');
 240 }
 241
 242 /*
 243  * Print address family header before a section of the routing table.
 244  */
 245 static void
 246 pr_family(int af)
 247 {
 248         const char *afname;
 249
 250         switch (af) {
 251         case AF_INET:
 252                 afname = "Internet";
 253                 break;
 254 #ifdef INET6
 255         case AF_INET6:
 256                 afname = "Internet6";
 257                 break;
 258 #endif /* INET6 */
 259         case AF_CCITT:
 260                 afname = "X.25";
 261                 break;
 262         default:
 263                 afname = NULL;
 264                 break;
 265         }
 266         if (afname != NULL)
 267                 printf("\n%s:\n", afname);
 268         else
 269                 printf("\nProtocol Family %d:\n", af);
 270 }
 271
 272 static int
 273 p_sockaddr(struct sockaddr *sa, int flags, int width)
 274 {
 275         char workbuf[128];
 276         char *cp = workbuf;
 277         const char *cplim;
 278         int len = sizeof(workbuf);
 279         int count;
 280
 281         switch(sa->sa_family) {
 282
 283         case AF_LINK:
 284             {
 285                 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
 286
 287                 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
 288                     sdl->sdl_slen == 0) {
 289                         snprintf(workbuf, sizeof(workbuf),
 290                             "link#%d", sdl->sdl_index);
 291                 } else {
 292                         switch (sdl->sdl_type) {
 293                         case IFT_ETHER:
 294                         case IFT_L2VLAN:
 295                         case IFT_CARP:
 296                             {
 297                                 int i;
 298                                 u_char *lla = (u_char *)sdl->sdl_data +
 299                                     sdl->sdl_nlen;
 300
 301                                 cplim = "";
 302                                 for (i = 0; i < sdl->sdl_alen; i++, lla++) {
 303                                         snprintf(cp, len, "%s%02x",
 304                                             cplim, *lla);
 305                                         len -= strlen(cp);
 306                                         cp += strlen(cp);
 307                                         if (len <= 0)
 308                                                 break;  /* overflow */
 309                                         cplim = ":";
 310                                 }
 311                                 cp = workbuf;
 312                                 break;
 313                             }
 314                         default:
 315                                 cp = link_ntoa(sdl);
 316                                 break;
 317                         }
 318                 }
 319                 break;
 320             }
 321
 322         case AF_INET:
 323             {
 324                 struct sockaddr_in *in = (struct sockaddr_in *)sa;
 325
 326                 if (in->sin_addr.s_addr == 0) {
 327                         /* cp points to workbuf */
 328                         strncpy(cp, "default", len);
 329                 } else
 330                         cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
 331                 break;
 332             }
 333
 334 #ifdef INET6
 335         case AF_INET6:
 336             {
 337                 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
 338
 339                 if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
 340                         /* cp points to workbuf */
 341                         strncpy(cp, "default", len);
 342                 } else {
 343                         cp = ((flags & RTF_HOST) ? routename(sa)
 344                                                  : netname(sa));
 345                 }
 346                 /* make sure numeric address is not truncated */
 347                 if (strchr(cp, ':') != NULL &&
 348                     (width < 0 || strlen(cp) > (size_t)width))
 349                         width = strlen(cp);
 350                 break;
 351             }
 352 #endif /* INET6 */
 353
 354         default:
 355             {
 356                 u_char *s = (u_char *)sa->sa_data, *slim;
 357
 358                 slim =  sa->sa_len + (u_char *) sa;
 359                 cplim = cp + sizeof(workbuf) - 6;
 360                 snprintf(cp, len, "(%d)", sa->sa_family);
 361                 len -= strlen(cp);
 362                 cp += strlen(cp);
 363                 if (len <= 0) {
 364                         cp = workbuf;
 365                         break;          /* overflow */
 366                 }
 367                 while (s < slim && cp < cplim) {
 368                         snprintf(cp, len, " %02x", *s++);
 369                         len -= strlen(cp);
 370                         cp += strlen(cp);
 371                         if (len <= 0)
 372                                 break;          /* overflow */
 373                         if (s < slim) {
 374                                 snprintf(cp, len, "%02x", *s++);
 375                                 len -= strlen(cp);
 376                                 cp += strlen(cp);
 377                                 if (len <= 0)
 378                                         break;          /* overflow */
 379                         }
 380                 }
 381                 cp = workbuf;
 382             }
 383         }
 384         if (width < 0) {
 385                 count = printf("%s ", cp);
 386         } else {
 387                 if (nflag || wflag)
 388                         count = printf("%-*s ", width, cp);
 389                 else
 390                         count = printf("%-*.*s ", width, width, cp);
 391         }
 392         return(count);
 393 }
 394
 395 static void
 396 p_flags(int f, const char *format)
 397 {
 398         char name[33], *flags;
 399         const struct bits *p = bits;
 400
 401         for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++) {
 402                 if (p->b_mask & f)
 403                         *flags++ = p->b_val;
 404         }
 405         *flags = '\0';
 406         printf(format, name);
 407 }