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