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  * $DragonFly: src/sbin/route/show.c,v 1.6 2006/01/19 22:19:30 dillon Exp $
   5  */
   6 /*
   7  * Copyright (c) 1983, 1988, 1993
   8  *      The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/protosw.h>
  37 #include <sys/socket.h>
  38 #include <sys/mbuf.h>
  39
  40 #include <net/if.h>
  41 #include <net/if_dl.h>
  42 #include <net/if_types.h>
  43 #include <net/route.h>
  44 #include <netinet/in.h>
  45 #include <netns/ns.h>
  46 #include <arpa/inet.h>
  47
  48 #include <sys/sysctl.h>
  49
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 #include <netdb.h>
  56
  57 #include "extern.h"
  58 #include "keywords.h"
  59
  60 #define ROUNDUP(a) \
  61         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  62 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  63
  64 /*
  65  * Definitions for showing gateway flags.
  66  */
  67 struct bits {
  68         int     b_mask;
  69         char    b_val;
  70 };
  71 static const struct bits bits[] = {
  72         { RTF_UP,       'U' },
  73         { RTF_GATEWAY,  'G' },
  74         { RTF_HOST,     'H' },
  75         { RTF_REJECT,   'R' },
  76         { RTF_BLACKHOLE, 'B' },
  77         { RTF_DYNAMIC,  'D' },
  78         { RTF_MODIFIED, 'M' },
  79         { RTF_DONE,     'd' }, /* Completed -- for routing messages only */
  80         { RTF_CLONING,  'C' },
  81         { RTF_XRESOLVE, 'X' },
  82         { RTF_LLINFO,   'L' },
  83         { RTF_STATIC,   'S' },
  84         { RTF_PROTO1,   '1' },
  85         { RTF_PROTO2,   '2' },
  86         { RTF_PROTO3,   '3' },
  87         { 0, 0 }
  88 };
  89
  90 static void     p_rtentry(struct rt_msghdr *);
  91 static int      p_sockaddr(struct sockaddr *, int, int);
  92 static void     p_flags(int, const char *);
  93 static void     pr_rthdr(void);
  94 static void     pr_family(int);
  95
  96 /*
  97  * Print routing tables.
  98  */
  99 void
 100 show(int argc, char *argv[])
 101 {
 102         struct rt_msghdr *rtm;
 103         char *buf = NULL, *next, *lim = NULL;
 104         size_t needed;
 105         int mib[7], af = 0;
 106         int miblen;
 107         struct sockaddr *sa;
 108
 109         if (argc > 1) {
 110                 argv++;
 111                 if (argc == 2 && **argv == '-') {
 112                     switch (keyword(*argv + 1)) {
 113                         case K_INET:
 114                                 af = AF_INET;
 115                                 break;
 116 #ifdef INET6
 117                         case K_INET6:
 118                                 af = AF_INET6;
 119                                 break;
 120 #endif
 121                         case K_XNS:
 122                                 af = AF_NS;
 123                                 break;
 124                         case K_LINK:
 125                                 af = AF_LINK;
 126                                 break;
 127                         case K_ISO:
 128                         case K_OSI:
 129                                 af = AF_ISO;
 130                                 break;
 131                         case K_X25:
 132                                 af = AF_CCITT;
 133                                 break;
 134                         default:
 135                                 goto bad;
 136                     }
 137                 } else
 138 bad:                    usage(*argv);
 139         }
 140         mib[0] = CTL_NET;
 141         mib[1] = PF_ROUTE;
 142         mib[2] = 0;
 143         mib[3] = 0;
 144         mib[4] = NET_RT_DUMP;
 145         mib[5] = 0;
 146         if (cpuflag >= 0) {
 147                 mib[6] = cpuflag;
 148                 miblen = 7;
 149         } else {
 150                 miblen = 6;
 151         }
 152         if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)    {
 153                 perror("route-sysctl-estimate");
 154                 exit(1);
 155         }
 156         if (needed > 0) {
 157                 if ((buf = malloc(needed)) == NULL) {
 158                         printf("out of space\n");
 159                         exit(1);
 160                 }
 161                 if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) {
 162                         perror("sysctl of routing table");
 163                         exit(1);
 164                 }
 165                 lim  = buf + needed;
 166         }
 167
 168         printf("Routing tables\n");
 169
 170         if (buf != NULL) {
 171                 for (next = buf; next < lim; next += rtm->rtm_msglen) {
 172                         rtm = (struct rt_msghdr *)next;
 173                         sa = (struct sockaddr *)(rtm + 1);
 174                         if (af != 0 && sa->sa_family != af)
 175                                 continue;
 176                         p_rtentry(rtm);
 177                 }
 178                 free(buf);
 179         }
 180 }
 181
 182 /* column widths; each followed by one space */
 183 #define WID_DST         (nflag ? 20 : 32)       /* destination column width */
 184 #define WID_GW          (nflag ? 20 : 32)       /* gateway column width */
 185
 186 /*
 187  * Print header for routing table columns.
 188  */
 189 static void
 190 pr_rthdr(void)
 191 {
 192         printf("%-*.*s %-*.*s %-6.6s\n",
 193             WID_DST, WID_DST, "Destination",
 194             WID_GW, WID_GW, "Gateway",
 195             "Flags");
 196 }
 197
 198 /*
 199  * Print a routing table entry.
 200  */
 201 static void
 202 p_rtentry(struct rt_msghdr *rtm)
 203 {
 204         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 205 #ifdef notdef
 206         static int masks_done, banner_printed;
 207 #endif
 208         static int old_af;
 209         int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
 210         int width;
 211
 212 #ifdef notdef
 213         /* for the moment, netmasks are skipped over */
 214         if (!banner_printed) {
 215                 printf("Netmasks:\n");
 216                 banner_printed = 1;
 217         }
 218         if (masks_done == 0) {
 219                 if (rtm->rtm_addrs != RTA_DST) {
 220                         masks_done = 1;
 221                         af = sa->sa_family;
 222                 }
 223         } else
 224 #endif
 225                 af = sa->sa_family;
 226         if (old_af != af) {
 227                 old_af = af;
 228                 pr_family(af);
 229                 pr_rthdr();
 230         }
 231
 232         /*
 233          * Print the information.  If wflag is set p_sockaddr() can return
 234          * a wider width then specified and we try to fit the second
 235          * address in any remaining space so the flags still lines up.
 236          */
 237         if (rtm->rtm_addrs == RTA_DST) {
 238                 p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
 239         } else {
 240                 width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
 241                 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
 242                 p_sockaddr(sa, 0, WID_GW + WID_DST - width);
 243         }
 244         p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
 245         putchar('\n');
 246 }
 247
 248 /*
 249  * Print address family header before a section of the routing table.
 250  */
 251 static void
 252 pr_family(int af)
 253 {
 254         const char *afname;
 255
 256         switch (af) {
 257         case AF_INET:
 258                 afname = "Internet";
 259                 break;
 260 #ifdef INET6
 261         case AF_INET6:
 262                 afname = "Internet6";
 263                 break;
 264 #endif /* INET6 */
 265         case AF_NS:
 266                 afname = "XNS";
 267                 break;
 268         case AF_IPX:
 269                 afname = "IPX";
 270                 break;
 271         case AF_ISO:
 272                 afname = "ISO";
 273                 break;
 274         case AF_CCITT:
 275                 afname = "X.25";
 276                 break;
 277         case AF_APPLETALK:
 278                 afname = "AppleTalk";
 279                 break;
 280         default:
 281                 afname = NULL;
 282                 break;
 283         }
 284         if (afname != NULL)
 285                 printf("\n%s:\n", afname);
 286         else
 287                 printf("\nProtocol Family %d:\n", af);
 288 }
 289
 290 static int
 291 p_sockaddr(struct sockaddr *sa, int flags, int width)
 292 {
 293         char workbuf[128];
 294         char *cp = workbuf;
 295         const char *cplim;
 296         int len = sizeof(workbuf);
 297         int count;
 298
 299         switch(sa->sa_family) {
 300
 301         case AF_LINK:
 302             {
 303                 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
 304
 305                 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
 306                     sdl->sdl_slen == 0) {
 307                         snprintf(workbuf, sizeof(workbuf),
 308                             "link#%d", sdl->sdl_index);
 309                 } else {
 310                         switch (sdl->sdl_type) {
 311                         case IFT_ETHER:
 312                             {
 313                                 int i;
 314                                 u_char *lla = (u_char *)sdl->sdl_data +
 315                                     sdl->sdl_nlen;
 316
 317                                 cplim = "";
 318                                 for (i = 0; i < sdl->sdl_alen; i++, lla++) {
 319                                         snprintf(cp, len, "%s%x", cplim, *lla);
 320                                         len -= strlen(cp);
 321                                         cp += strlen(cp);
 322                                         if (len <= 0)
 323                                                 break;  /* overflow */
 324                                         cplim = ":";
 325                                 }
 326                                 cp = workbuf;
 327                                 break;
 328                             }
 329                         default:
 330                                 cp = link_ntoa(sdl);
 331                                 break;
 332                         }
 333                 }
 334                 break;
 335             }
 336
 337         case AF_INET:
 338             {
 339                 struct sockaddr_in *in = (struct sockaddr_in *)sa;
 340
 341                 if (in->sin_addr.s_addr == 0) {
 342                         /* cp points to workbuf */
 343                         strncpy(cp, "default", len);
 344                 } else
 345                         cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
 346                 break;
 347             }
 348
 349 #ifdef INET6
 350         case AF_INET6:
 351             {
 352                 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
 353
 354                 if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
 355                         /* cp points to workbuf */
 356                         strncpy(cp, "default", len);
 357                 } else {
 358                         cp = ((flags & RTF_HOST) ? routename(sa)
 359                                                  : netname(sa));
 360                 }
 361                 /* make sure numeric address is not truncated */
 362                 if (strchr(cp, ':') != NULL &&
 363                     (width < 0 || strlen(cp) > (size_t)width))
 364                         width = strlen(cp);
 365                 break;
 366             }
 367 #endif /* INET6 */
 368
 369         case AF_NS:
 370                 cp = ns_print((struct sockaddr_ns *)sa);
 371                 break;
 372
 373         default:
 374             {
 375                 u_char *s = (u_char *)sa->sa_data, *slim;
 376
 377                 slim =  sa->sa_len + (u_char *) sa;
 378                 cplim = cp + sizeof(workbuf) - 6;
 379                 snprintf(cp, len, "(%d)", sa->sa_family);
 380                 len -= strlen(cp);
 381                 cp += strlen(cp);
 382                 if (len <= 0) {
 383                         cp = workbuf;
 384                         break;          /* overflow */
 385                 }
 386                 while (s < slim && cp < cplim) {
 387                         snprintf(cp, len, " %02x", *s++);
 388                         len -= strlen(cp);
 389                         cp += strlen(cp);
 390                         if (len <= 0)
 391                                 break;          /* overflow */
 392                         if (s < slim) {
 393                                 snprintf(cp, len, "%02x", *s++);
 394                                 len -= strlen(cp);
 395                                 cp += strlen(cp);
 396                                 if (len <= 0)
 397                                         break;          /* overflow */
 398                         }
 399                 }
 400                 cp = workbuf;
 401             }
 402         }
 403         if (width < 0) {
 404                 count = printf("%s ", cp);
 405         } else {
 406                 if (nflag || wflag)
 407                         count = printf("%-*s ", width, cp);
 408                 else
 409                         count = printf("%-*.*s ", width, width, cp);
 410         }
 411         return(count);
 412 }
 413
 414 static void
 415 p_flags(int f, const char *format)
 416 {
 417         char name[33], *flags;
 418         const struct bits *p = bits;
 419
 420         for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
 421                 if (p->b_mask & f)
 422                         *flags++ = p->b_val;
 423         }
 424         *flags = '\0';
 425         printf(format, name);
 426 }