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 #include "keywords.h"
  57
  58 #define ROUNDUP(a) \
  59         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  60 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  61
  62 /*
  63  * Definitions for showing gateway flags.
  64  */
  65 struct bits {
  66         int     b_mask;
  67         char    b_val;
  68 };
  69 static const struct bits bits[] = {
  70         { RTF_UP,       'U' },
  71         { RTF_GATEWAY,  'G' },
  72         { RTF_HOST,     'H' },
  73         { RTF_REJECT,   'R' },
  74         { RTF_BLACKHOLE, 'B' },
  75         { RTF_DYNAMIC,  'D' },
  76         { RTF_MODIFIED, 'M' },
  77         { RTF_DONE,     'd' }, /* Completed -- for routing messages only */
  78         { RTF_CLONING,  'C' },
  79         { RTF_XRESOLVE, 'X' },
  80         { RTF_LLINFO,   'L' },
  81         { RTF_STATIC,   'S' },
  82         { RTF_PROTO1,   '1' },
  83         { RTF_PROTO2,   '2' },
  84         { RTF_PROTO3,   '3' },
  85         { 0, 0 }
  86 };
  87
  88 static void     p_rtentry(struct rt_msghdr *);
  89 static int      p_sockaddr(struct sockaddr *, int, int);
  90 static void     p_flags(int, const char *);
  91 static void     pr_rthdr(void);
  92 static void     pr_family(int);
  93
  94 /*
  95  * Print routing tables.
  96  */
  97 void
  98 show(int argc, char *argv[])
  99 {
 100         struct rt_msghdr *rtm;
 101         char *buf = NULL, *next, *lim = NULL;
 102         size_t needed;
 103         int mib[7], af = 0;
 104         int miblen;
 105         struct sockaddr *sa;
 106
 107         if (argc > 1) {
 108                 argv++;
 109                 if (argc == 2 && **argv == '-') {
 110                     switch (keyword(*argv + 1)) {
 111                         case K_INET:
 112                                 af = AF_INET;
 113                                 break;
 114 #ifdef INET6
 115                         case K_INET6:
 116                                 af = AF_INET6;
 117                                 break;
 118 #endif
 119                         case K_XNS:
 120                                 af = AF_NS;
 121                                 break;
 122                         case K_LINK:
 123                                 af = AF_LINK;
 124                                 break;
 125                         case K_ISO:
 126                         case K_OSI:
 127                                 af = AF_ISO;
 128                                 break;
 129                         case K_X25:
 130                                 af = AF_CCITT;
 131                                 break;
 132                         default:
 133                                 goto bad;
 134                     }
 135                 } else
 136 bad:                    usage(*argv);
 137         }
 138         mib[0] = CTL_NET;
 139         mib[1] = PF_ROUTE;
 140         mib[2] = 0;
 141         mib[3] = 0;
 142         mib[4] = NET_RT_DUMP;
 143         mib[5] = 0;
 144         if (cpuflag >= 0) {
 145                 mib[6] = cpuflag;
 146                 miblen = 7;
 147         } else {
 148                 miblen = 6;
 149         }
 150         if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)    {
 151                 perror("route-sysctl-estimate");
 152                 exit(1);
 153         }
 154         if (needed > 0) {
 155                 if ((buf = malloc(needed)) == NULL) {
 156                         printf("out of space\n");
 157                         exit(1);
 158                 }
 159                 if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) {
 160                         perror("sysctl of routing table");
 161                         exit(1);
 162                 }
 163                 lim  = buf + needed;
 164         }
 165
 166         printf("Routing tables\n");
 167
 168         if (buf != NULL) {
 169                 for (next = buf; next < lim; next += rtm->rtm_msglen) {
 170                         rtm = (struct rt_msghdr *)next;
 171                         sa = (struct sockaddr *)(rtm + 1);
 172                         if (af != 0 && sa->sa_family != af)
 173                                 continue;
 174                         p_rtentry(rtm);
 175                 }
 176                 free(buf);
 177         }
 178 }
 179
 180 /* column widths; each followed by one space */
 181 #define WID_DST         (nflag ? 20 : 32)       /* destination column width */
 182 #define WID_GW          (nflag ? 20 : 32)       /* gateway column width */
 183
 184 /*
 185  * Print header for routing table columns.
 186  */
 187 static void
 188 pr_rthdr(void)
 189 {
 190         printf("%-*.*s %-*.*s %-6.6s\n",
 191             WID_DST, WID_DST, "Destination",
 192             WID_GW, WID_GW, "Gateway",
 193             "Flags");
 194 }
 195
 196 /*
 197  * Print a routing table entry.
 198  */
 199 static void
 200 p_rtentry(struct rt_msghdr *rtm)
 201 {
 202         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 203 #ifdef notdef
 204         static int masks_done, banner_printed;
 205 #endif
 206         static int old_af;
 207         int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
 208         int width;
 209
 210 #ifdef notdef
 211         /* for the moment, netmasks are skipped over */
 212         if (!banner_printed) {
 213                 printf("Netmasks:\n");
 214                 banner_printed = 1;
 215         }
 216         if (masks_done == 0) {
 217                 if (rtm->rtm_addrs != RTA_DST) {
 218                         masks_done = 1;
 219                         af = sa->sa_family;
 220                 }
 221         } else
 222 #endif
 223                 af = sa->sa_family;
 224         if (old_af != af) {
 225                 old_af = af;
 226                 pr_family(af);
 227                 pr_rthdr();
 228         }
 229
 230         /*
 231          * Print the information.  If wflag is set p_sockaddr() can return
 232          * a wider width then specified and we try to fit the second
 233          * address in any remaining space so the flags still lines up.
 234          */
 235         if (rtm->rtm_addrs == RTA_DST) {
 236                 p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
 237         } else {
 238                 width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
 239                 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
 240                 p_sockaddr(sa, 0, WID_GW + WID_DST - width);
 241         }
 242         p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
 243         putchar('\n');
 244 }
 245
 246 /*
 247  * Print address family header before a section of the routing table.
 248  */
 249 static void
 250 pr_family(int af)
 251 {
 252         const char *afname;
 253
 254         switch (af) {
 255         case AF_INET:
 256                 afname = "Internet";
 257                 break;
 258 #ifdef INET6
 259         case AF_INET6:
 260                 afname = "Internet6";
 261                 break;
 262 #endif /* INET6 */
 263         case AF_NS:
 264                 afname = "XNS";
 265                 break;
 266         case AF_IPX:
 267                 afname = "IPX";
 268                 break;
 269         case AF_ISO:
 270                 afname = "ISO";
 271                 break;
 272         case AF_CCITT:
 273                 afname = "X.25";
 274                 break;
 275         default:
 276                 afname = NULL;
 277                 break;
 278         }
 279         if (afname != NULL)
 280                 printf("\n%s:\n", afname);
 281         else
 282                 printf("\nProtocol Family %d:\n", af);
 283 }
 284
 285 static int
 286 p_sockaddr(struct sockaddr *sa, int flags, int width)
 287 {
 288         char workbuf[128];
 289         char *cp = workbuf;
 290         const char *cplim;
 291         int len = sizeof(workbuf);
 292         int count;
 293
 294         switch(sa->sa_family) {
 295
 296         case AF_LINK:
 297             {
 298                 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
 299
 300                 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
 301                     sdl->sdl_slen == 0) {
 302                         snprintf(workbuf, sizeof(workbuf),
 303                             "link#%d", sdl->sdl_index);
 304                 } else {
 305                         switch (sdl->sdl_type) {
 306                         case IFT_ETHER:
 307                             {
 308                                 int i;
 309                                 u_char *lla = (u_char *)sdl->sdl_data +
 310                                     sdl->sdl_nlen;
 311
 312                                 cplim = "";
 313                                 for (i = 0; i < sdl->sdl_alen; i++, lla++) {
 314                                         snprintf(cp, len, "%s%x", cplim, *lla);
 315                                         len -= strlen(cp);
 316                                         cp += strlen(cp);
 317                                         if (len <= 0)
 318                                                 break;  /* overflow */
 319                                         cplim = ":";
 320                                 }
 321                                 cp = workbuf;
 322                                 break;
 323                             }
 324                         default:
 325                                 cp = link_ntoa(sdl);
 326                                 break;
 327                         }
 328                 }
 329                 break;
 330             }
 331
 332         case AF_INET:
 333             {
 334                 struct sockaddr_in *in = (struct sockaddr_in *)sa;
 335
 336                 if (in->sin_addr.s_addr == 0) {
 337                         /* cp points to workbuf */
 338                         strncpy(cp, "default", len);
 339                 } else
 340                         cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
 341                 break;
 342             }
 343
 344 #ifdef INET6
 345         case AF_INET6:
 346             {
 347                 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
 348
 349                 if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
 350                         /* cp points to workbuf */
 351                         strncpy(cp, "default", len);
 352                 } else {
 353                         cp = ((flags & RTF_HOST) ? routename(sa)
 354                                                  : netname(sa));
 355                 }
 356                 /* make sure numeric address is not truncated */
 357                 if (strchr(cp, ':') != NULL &&
 358                     (width < 0 || strlen(cp) > (size_t)width))
 359                         width = strlen(cp);
 360                 break;
 361             }
 362 #endif /* INET6 */
 363
 364         default:
 365             {
 366                 u_char *s = (u_char *)sa->sa_data, *slim;
 367
 368                 slim =  sa->sa_len + (u_char *) sa;
 369                 cplim = cp + sizeof(workbuf) - 6;
 370                 snprintf(cp, len, "(%d)", sa->sa_family);
 371                 len -= strlen(cp);
 372                 cp += strlen(cp);
 373                 if (len <= 0) {
 374                         cp = workbuf;
 375                         break;          /* overflow */
 376                 }
 377                 while (s < slim && cp < cplim) {
 378                         snprintf(cp, len, " %02x", *s++);
 379                         len -= strlen(cp);
 380                         cp += strlen(cp);
 381                         if (len <= 0)
 382                                 break;          /* overflow */
 383                         if (s < slim) {
 384                                 snprintf(cp, len, "%02x", *s++);
 385                                 len -= strlen(cp);
 386                                 cp += strlen(cp);
 387                                 if (len <= 0)
 388                                         break;          /* overflow */
 389                         }
 390                 }
 391                 cp = workbuf;
 392             }
 393         }
 394         if (width < 0) {
 395                 count = printf("%s ", cp);
 396         } else {
 397                 if (nflag || wflag)
 398                         count = printf("%-*s ", width, cp);
 399                 else
 400                         count = printf("%-*.*s ", width, width, cp);
 401         }
 402         return(count);
 403 }
 404
 405 static void
 406 p_flags(int f, const char *format)
 407 {
 408         char name[33], *flags;
 409         const struct bits *p = bits;
 410
 411         for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
 412                 if (p->b_mask & f)
 413                         *flags++ = p->b_val;
 414         }
 415         *flags = '\0';
 416         printf(format, name);
 417 }