1 /* $NetBSD: show.c,v 1.44 2011/11/11 15:09:32 gdt 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 1.44 2011/11/11 15:09:32 gdt 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 <arpa/inet.h> 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/if_types.h> 50 #include <net/route.h> 51 #include <netinet/in.h> 52 #include <netmpls/mpls.h> 53 54 #include <sys/sysctl.h> 55 56 #include <netdb.h> 57 #include <stdbool.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 #include <err.h> 63 64 #include "keywords.h" 65 #include "extern.h" 66 #include "prog_ops.h" 67 68 69 /* 70 * Definitions for showing gateway flags. 71 */ 72 struct bits { 73 int 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 { RTF_ANNOUNCE, 'p' }, 94 { 0, '\0' } 95 }; 96 97 static void pr_rthdr(int); 98 static void p_rtentry(struct rt_msghdr *); 99 static void pr_family(int); 100 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int ); 101 static void p_flags(int); 102 103 void 104 parse_show_opts(int argc, char * const *argv, int *afp, int *flagsp, 105 const char **afnamep, bool nolink) 106 { 107 const char *afname = "unspec"; 108 int af, flags; 109 110 flags = 0; 111 af = AF_UNSPEC; 112 for (; argc >= 2; argc--) { 113 if (*argv[argc - 1] != '-') 114 goto bad; 115 switch (keyword(argv[argc - 1] + 1)) { 116 case K_HOST: 117 flags |= RTF_HOST; 118 break; 119 case K_LLINFO: 120 flags |= RTF_LLINFO; 121 break; 122 case K_INET: 123 af = AF_INET; 124 afname = argv[argc - 1] + 1; 125 break; 126 #ifdef INET6 127 case K_INET6: 128 af = AF_INET6; 129 afname = argv[argc - 1] + 1; 130 break; 131 #endif 132 #ifndef SMALL 133 case K_ATALK: 134 af = AF_APPLETALK; 135 afname = argv[argc - 1] + 1; 136 break; 137 case K_ISO: 138 case K_OSI: 139 af = AF_ISO; 140 afname = argv[argc - 1] + 1; 141 break; 142 case K_MPLS: 143 af = AF_MPLS; 144 afname = argv[argc - 1] + 1; 145 break; 146 #endif /* SMALL */ 147 case K_LINK: 148 if (nolink) 149 goto bad; 150 af = AF_LINK; 151 afname = argv[argc - 1] + 1; 152 break; 153 default: 154 goto bad; 155 } 156 } 157 switch (argc) { 158 case 1: 159 case 0: 160 break; 161 default: 162 bad: 163 usage(argv[argc - 1]); 164 } 165 if (afnamep != NULL) 166 *afnamep = afname; 167 *afp = af; 168 *flagsp = flags; 169 } 170 171 /* 172 * Print routing tables. 173 */ 174 void 175 show(int argc, char *const *argv) 176 { 177 size_t needed; 178 int af, flags, mib[6]; 179 char *buf, *next, *lim; 180 struct rt_msghdr *rtm; 181 struct sockaddr *sa; 182 183 parse_show_opts(argc, argv, &af, &flags, NULL, true); 184 mib[0] = CTL_NET; 185 mib[1] = PF_ROUTE; 186 mib[2] = 0; 187 mib[3] = 0; 188 mib[4] = NET_RT_DUMP; 189 mib[5] = 0; 190 if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 191 err(EXIT_FAILURE, "route-sysctl-estimate"); 192 buf = lim = NULL; 193 if (needed) { 194 if ((buf = malloc(needed)) == 0) 195 err(EXIT_FAILURE, "malloc"); 196 if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 197 err(EXIT_FAILURE, "sysctl of routing table"); 198 lim = buf + needed; 199 } 200 201 printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : ""); 202 203 if (needed) { 204 for (next = buf; next < lim; next += rtm->rtm_msglen) { 205 rtm = (struct rt_msghdr *)next; 206 sa = (struct sockaddr *)(rtm + 1); 207 if ((rtm->rtm_flags & flags) != flags) 208 continue; 209 if (af == AF_UNSPEC || af == sa->sa_family) 210 p_rtentry(rtm); 211 } 212 free(buf); 213 } 214 } 215 216 217 /* column widths; each followed by one space */ 218 #ifndef INET6 219 #define WID_DST(af) 18 /* width of destination column */ 220 #define WID_GW(af) 18 /* width of gateway column */ 221 #else 222 /* width of destination/gateway column */ 223 #if 1 224 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */ 225 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 34 : 18) : 18) 226 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18) 227 #else 228 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */ 229 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18) 230 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18) 231 #endif 232 #endif /* INET6 */ 233 234 /* 235 * Print header for routing table columns. 236 */ 237 static void 238 pr_rthdr(int af) 239 { 240 241 printf("%-*.*s %-*.*s %-6.6s\n", 242 WID_DST(af), WID_DST(af), "Destination", 243 WID_GW(af), WID_GW(af), "Gateway", 244 "Flags"); 245 } 246 247 248 /* 249 * Print a routing table entry. 250 */ 251 static void 252 p_rtentry(struct rt_msghdr *rtm) 253 { 254 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 255 #ifdef notdef 256 static int masks_done, banner_printed; 257 #endif 258 static int old_af; 259 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST | 260 RTF_REJECT | RTF_LLINFO; 261 262 #ifdef notdef 263 /* for the moment, netmasks are skipped over */ 264 if (!banner_printed) { 265 printf("Netmasks:\n"); 266 banner_printed = 1; 267 } 268 if (masks_done == 0) { 269 if (rtm->rtm_addrs != RTA_DST ) { 270 masks_done = 1; 271 af = sa->sa_family; 272 } 273 } else 274 #endif 275 af = sa->sa_family; 276 if (old_af != af) { 277 old_af = af; 278 pr_family(af); 279 pr_rthdr(af); 280 } 281 if (rtm->rtm_addrs == RTA_DST) 282 p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1); 283 else { 284 struct sockaddr *nm; 285 286 if ((rtm->rtm_addrs & RTA_NETMASK) == 0) 287 nm = NULL; 288 else { 289 /* skip to gateway */ 290 nm = (struct sockaddr *) 291 (RT_ROUNDUP(sa->sa_len) + (char *)sa); 292 /* skip over gateway to netmask */ 293 nm = (struct sockaddr *) 294 (RT_ROUNDUP(nm->sa_len) + (char *)nm); 295 } 296 297 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af)); 298 sa = (struct sockaddr *)(RT_ROUNDUP(sa->sa_len) + (char *)sa); 299 p_sockaddr(sa, NULL, 0, WID_GW(af)); 300 } 301 p_flags(rtm->rtm_flags & interesting); 302 putchar('\n'); 303 } 304 305 306 /* 307 * Print address family header before a section of the routing table. 308 */ 309 static void 310 pr_family(int af) 311 { 312 const char *afname; 313 314 switch (af) { 315 case AF_INET: 316 afname = "Internet"; 317 break; 318 #ifdef INET6 319 case AF_INET6: 320 afname = "Internet6"; 321 break; 322 #endif /* INET6 */ 323 #ifndef SMALL 324 case AF_ISO: 325 afname = "ISO"; 326 break; 327 case AF_MPLS: 328 afname = "MPLS"; 329 break; 330 #endif /* SMALL */ 331 case AF_APPLETALK: 332 afname = "AppleTalk"; 333 break; 334 default: 335 afname = NULL; 336 break; 337 } 338 if (afname) 339 printf("\n%s:\n", afname); 340 else 341 printf("\nProtocol Family %d:\n", af); 342 } 343 344 345 static void 346 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width) 347 { 348 char workbuf[128]; 349 const char *cp; 350 351 switch(sa->sa_family) { 352 353 case AF_LINK: 354 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 355 NULL, 0, NI_NUMERICHOST) != 0) 356 strlcpy(workbuf, "invalid", sizeof(workbuf)); 357 cp = workbuf; 358 break; 359 360 case AF_INET: 361 cp = routename(sa, nm, flags); 362 break; 363 364 #ifdef INET6 365 case AF_INET6: 366 cp = routename(sa, nm, flags); 367 /* make sure numeric address is not truncated */ 368 if (strchr(cp, ':') != NULL && (int)strlen(cp) > width) 369 width = strlen(cp); 370 break; 371 #endif /* INET6 */ 372 373 #ifndef SMALL 374 case AF_MPLS: 375 { 376 struct sockaddr_mpls *smpls = (struct sockaddr_mpls *)sa; 377 union mpls_shim ms; 378 379 ms.s_addr = ntohl(smpls->smpls_addr.s_addr); 380 381 snprintf(workbuf, sizeof(workbuf), "%u", 382 ms.shim.label); 383 cp = workbuf; 384 } 385 break; 386 case AF_APPLETALK: 387 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 388 NULL, 0, NI_NUMERICHOST) != 0) 389 strlcpy(workbuf, "invalid", sizeof(workbuf)); 390 cp = workbuf; 391 break; 392 393 #endif /* SMALL */ 394 395 default: 396 { 397 u_char *s = (u_char *)sa->sa_data, *slim; 398 char *wp = workbuf, *wplim; 399 400 slim = sa->sa_len + (u_char *)sa; 401 wplim = wp + sizeof(workbuf) - 6; 402 wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family); 403 while (s < slim && wp < wplim) { 404 wp += snprintf(wp, wplim - wp, " %02x", *s++); 405 if (s < slim) 406 wp += snprintf(wp, wplim - wp, "%02x", *s++); 407 } 408 cp = workbuf; 409 } 410 } 411 if (width < 0 ) 412 printf("%s ", cp); 413 else { 414 if (nflag) 415 printf("%-*s ", width, cp); 416 else 417 printf("%-*.*s ", width, width, cp); 418 } 419 } 420 421 static void 422 p_flags(int f) 423 { 424 char name[33], *flags; 425 const struct bits *p = bits; 426 427 for (flags = name; p->b_mask; p++) 428 if (p->b_mask & f) 429 *flags++ = p->b_val; 430 else if (Sflag) 431 *flags++ = ' '; 432 *flags = '\0'; 433 printf("%-6.6s ", name); 434 } 435 436