1 /* $NetBSD: show.c,v 1.42 2010/12/13 17:39:47 pooka 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 1.42 2010/12/13 17:39:47 pooka 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 #define ROUNDUP(a) \ 69 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 70 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 71 72 /* 73 * Definitions for showing gateway flags. 74 */ 75 struct bits { 76 short b_mask; 77 char b_val; 78 }; 79 static const struct bits bits[] = { 80 { RTF_UP, 'U' }, 81 { RTF_GATEWAY, 'G' }, 82 { RTF_HOST, 'H' }, 83 { RTF_REJECT, 'R' }, 84 { RTF_DYNAMIC, 'D' }, 85 { RTF_MODIFIED, 'M' }, 86 { RTF_DONE, 'd' }, /* Completed -- for routing messages only */ 87 { RTF_MASK, 'm' }, /* Mask Present -- for routing messages only */ 88 { RTF_CLONING, 'C' }, 89 { RTF_XRESOLVE, 'X' }, 90 { RTF_LLINFO, 'L' }, 91 { RTF_STATIC, 'S' }, 92 { RTF_BLACKHOLE, 'B' }, 93 { RTF_CLONED, 'c' }, 94 { RTF_PROTO1, '1' }, 95 { RTF_PROTO2, '2' }, 96 { 0, '\0' } 97 }; 98 99 static void pr_rthdr(int); 100 static void p_rtentry(struct rt_msghdr *); 101 static void pr_family(int); 102 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int ); 103 static void p_flags(int); 104 105 void 106 parse_show_opts(int argc, char * const *argv, int *afp, int *flagsp, 107 const char **afnamep, bool nolink) 108 { 109 const char *afname = "unspec"; 110 int af, flags; 111 112 flags = 0; 113 af = AF_UNSPEC; 114 for (; argc >= 2; argc--) { 115 if (*argv[argc - 1] != '-') 116 goto bad; 117 switch (keyword(argv[argc - 1] + 1)) { 118 case K_HOST: 119 flags |= RTF_HOST; 120 break; 121 case K_LLINFO: 122 flags |= RTF_LLINFO; 123 break; 124 case K_INET: 125 af = AF_INET; 126 afname = argv[argc - 1] + 1; 127 break; 128 #ifdef INET6 129 case K_INET6: 130 af = AF_INET6; 131 afname = argv[argc - 1] + 1; 132 break; 133 #endif 134 #ifndef SMALL 135 case K_ATALK: 136 af = AF_APPLETALK; 137 afname = argv[argc - 1] + 1; 138 break; 139 case K_ISO: 140 case K_OSI: 141 af = AF_ISO; 142 afname = argv[argc - 1] + 1; 143 break; 144 case K_MPLS: 145 af = AF_MPLS; 146 afname = argv[argc - 1] + 1; 147 break; 148 #endif /* SMALL */ 149 case K_LINK: 150 if (nolink) 151 goto bad; 152 af = AF_LINK; 153 afname = argv[argc - 1] + 1; 154 break; 155 default: 156 goto bad; 157 } 158 } 159 switch (argc) { 160 case 1: 161 case 0: 162 break; 163 default: 164 bad: 165 usage(argv[argc - 1]); 166 } 167 if (afnamep != NULL) 168 *afnamep = afname; 169 *afp = af; 170 *flagsp = flags; 171 } 172 173 /* 174 * Print routing tables. 175 */ 176 void 177 show(int argc, char *const *argv) 178 { 179 size_t needed; 180 int af, flags, mib[6]; 181 char *buf, *next, *lim; 182 struct rt_msghdr *rtm; 183 struct sockaddr *sa; 184 185 parse_show_opts(argc, argv, &af, &flags, NULL, true); 186 mib[0] = CTL_NET; 187 mib[1] = PF_ROUTE; 188 mib[2] = 0; 189 mib[3] = 0; 190 mib[4] = NET_RT_DUMP; 191 mib[5] = 0; 192 if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 193 err(EXIT_FAILURE, "route-sysctl-estimate"); 194 buf = lim = NULL; 195 if (needed) { 196 if ((buf = malloc(needed)) == 0) 197 err(EXIT_FAILURE, "malloc"); 198 if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 199 err(EXIT_FAILURE, "sysctl of routing table"); 200 lim = buf + needed; 201 } 202 203 printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : ""); 204 205 if (needed) { 206 for (next = buf; next < lim; next += rtm->rtm_msglen) { 207 rtm = (struct rt_msghdr *)next; 208 sa = (struct sockaddr *)(rtm + 1); 209 if ((rtm->rtm_flags & flags) != flags) 210 continue; 211 if (af == AF_UNSPEC || af == sa->sa_family) 212 p_rtentry(rtm); 213 } 214 free(buf); 215 } 216 } 217 218 219 /* column widths; each followed by one space */ 220 #ifndef INET6 221 #define WID_DST(af) 18 /* width of destination column */ 222 #define WID_GW(af) 18 /* width of gateway column */ 223 #else 224 /* width of destination/gateway column */ 225 #if 1 226 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */ 227 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 34 : 18) : 18) 228 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18) 229 #else 230 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */ 231 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18) 232 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18) 233 #endif 234 #endif /* INET6 */ 235 236 /* 237 * Print header for routing table columns. 238 */ 239 static void 240 pr_rthdr(int af) 241 { 242 243 printf("%-*.*s %-*.*s %-6.6s\n", 244 WID_DST(af), WID_DST(af), "Destination", 245 WID_GW(af), WID_GW(af), "Gateway", 246 "Flags"); 247 } 248 249 250 /* 251 * Print a routing table entry. 252 */ 253 static void 254 p_rtentry(struct rt_msghdr *rtm) 255 { 256 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 257 #ifdef notdef 258 static int masks_done, banner_printed; 259 #endif 260 static int old_af; 261 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST | 262 RTF_REJECT | RTF_LLINFO; 263 264 #ifdef notdef 265 /* for the moment, netmasks are skipped over */ 266 if (!banner_printed) { 267 printf("Netmasks:\n"); 268 banner_printed = 1; 269 } 270 if (masks_done == 0) { 271 if (rtm->rtm_addrs != RTA_DST ) { 272 masks_done = 1; 273 af = sa->sa_family; 274 } 275 } else 276 #endif 277 af = sa->sa_family; 278 if (old_af != af) { 279 old_af = af; 280 pr_family(af); 281 pr_rthdr(af); 282 } 283 if (rtm->rtm_addrs == RTA_DST) 284 p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1); 285 else { 286 struct sockaddr *nm; 287 288 if ((rtm->rtm_addrs & RTA_NETMASK) == 0) 289 nm = NULL; 290 else { 291 /* skip to gateway */ 292 nm = (struct sockaddr *) 293 (ROUNDUP(sa->sa_len) + (char *)sa); 294 /* skip over gateway to netmask */ 295 nm = (struct sockaddr *) 296 (ROUNDUP(nm->sa_len) + (char *)nm); 297 } 298 299 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af)); 300 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa); 301 p_sockaddr(sa, NULL, 0, WID_GW(af)); 302 } 303 p_flags(rtm->rtm_flags & interesting); 304 putchar('\n'); 305 } 306 307 308 /* 309 * Print address family header before a section of the routing table. 310 */ 311 static void 312 pr_family(int af) 313 { 314 const char *afname; 315 316 switch (af) { 317 case AF_INET: 318 afname = "Internet"; 319 break; 320 #ifdef INET6 321 case AF_INET6: 322 afname = "Internet6"; 323 break; 324 #endif /* INET6 */ 325 #ifndef SMALL 326 case AF_ISO: 327 afname = "ISO"; 328 break; 329 case AF_MPLS: 330 afname = "MPLS"; 331 break; 332 #endif /* SMALL */ 333 case AF_APPLETALK: 334 afname = "AppleTalk"; 335 break; 336 default: 337 afname = NULL; 338 break; 339 } 340 if (afname) 341 printf("\n%s:\n", afname); 342 else 343 printf("\nProtocol Family %d:\n", af); 344 } 345 346 347 static void 348 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width) 349 { 350 char workbuf[128]; 351 const char *cp; 352 353 switch(sa->sa_family) { 354 355 case AF_LINK: 356 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 357 NULL, 0, NI_NUMERICHOST) != 0) 358 strlcpy(workbuf, "invalid", sizeof(workbuf)); 359 cp = workbuf; 360 break; 361 362 case AF_INET: 363 cp = routename(sa, nm, flags); 364 break; 365 366 #ifdef INET6 367 case AF_INET6: 368 cp = routename(sa, nm, flags); 369 /* make sure numeric address is not truncated */ 370 if (strchr(cp, ':') != NULL && (int)strlen(cp) > width) 371 width = strlen(cp); 372 break; 373 #endif /* INET6 */ 374 375 #ifndef SMALL 376 case AF_MPLS: 377 { 378 struct sockaddr_mpls *smpls = (struct sockaddr_mpls *)sa; 379 union mpls_shim ms; 380 381 ms.s_addr = ntohl(smpls->smpls_addr.s_addr); 382 383 snprintf(workbuf, sizeof(workbuf), "%u", 384 ms.shim.label); 385 cp = workbuf; 386 } 387 break; 388 case AF_APPLETALK: 389 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 390 NULL, 0, NI_NUMERICHOST) != 0) 391 strlcpy(workbuf, "invalid", sizeof(workbuf)); 392 cp = workbuf; 393 break; 394 395 #endif /* SMALL */ 396 397 default: 398 { 399 u_char *s = (u_char *)sa->sa_data, *slim; 400 char *wp = workbuf, *wplim; 401 402 slim = sa->sa_len + (u_char *)sa; 403 wplim = wp + sizeof(workbuf) - 6; 404 wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family); 405 while (s < slim && wp < wplim) { 406 wp += snprintf(wp, wplim - wp, " %02x", *s++); 407 if (s < slim) 408 wp += snprintf(wp, wplim - wp, "%02x", *s++); 409 } 410 cp = workbuf; 411 } 412 } 413 if (width < 0 ) 414 printf("%s ", cp); 415 else { 416 if (nflag) 417 printf("%-*s ", width, cp); 418 else 419 printf("%-*.*s ", width, width, cp); 420 } 421 } 422 423 static void 424 p_flags(int f) 425 { 426 char name[33], *flags; 427 const struct bits *p = bits; 428 429 for (flags = name; p->b_mask; p++) 430 if (p->b_mask & f) 431 *flags++ = p->b_val; 432 else if (Sflag) 433 *flags++ = ' '; 434 *flags = '\0'; 435 printf("%-6.6s ", name); 436 } 437 438