show.c revision 1.41
1 /* $NetBSD: show.c,v 1.41 2010/06/26 14:29:36 kefren 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 1.41 2010/06/26 14:29:36 kefren 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 67 #define ROUNDUP(a) \ 68 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 69 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 70 71 /* 72 * Definitions for showing gateway flags. 73 */ 74 struct bits { 75 short b_mask; 76 char b_val; 77 }; 78 static const struct bits bits[] = { 79 { RTF_UP, 'U' }, 80 { RTF_GATEWAY, 'G' }, 81 { RTF_HOST, 'H' }, 82 { RTF_REJECT, 'R' }, 83 { RTF_DYNAMIC, 'D' }, 84 { RTF_MODIFIED, 'M' }, 85 { RTF_DONE, 'd' }, /* Completed -- for routing messages only */ 86 { RTF_MASK, 'm' }, /* Mask Present -- for routing messages only */ 87 { RTF_CLONING, 'C' }, 88 { RTF_XRESOLVE, 'X' }, 89 { RTF_LLINFO, 'L' }, 90 { RTF_STATIC, 'S' }, 91 { RTF_BLACKHOLE, 'B' }, 92 { RTF_CLONED, 'c' }, 93 { RTF_PROTO1, '1' }, 94 { RTF_PROTO2, '2' }, 95 { 0, '\0' } 96 }; 97 98 static void pr_rthdr(int); 99 static void p_rtentry(struct rt_msghdr *); 100 static void pr_family(int); 101 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int ); 102 static void p_flags(int); 103 104 void 105 parse_show_opts(int argc, char * const *argv, int *afp, int *flagsp, 106 const char **afnamep, bool nolink) 107 { 108 const char *afname = "unspec"; 109 int af, flags; 110 111 flags = 0; 112 af = AF_UNSPEC; 113 for (; argc >= 2; argc--) { 114 if (*argv[argc - 1] != '-') 115 goto bad; 116 switch (keyword(argv[argc - 1] + 1)) { 117 case K_HOST: 118 flags |= RTF_HOST; 119 break; 120 case K_LLINFO: 121 flags |= RTF_LLINFO; 122 break; 123 case K_INET: 124 af = AF_INET; 125 afname = argv[argc - 1] + 1; 126 break; 127 #ifdef INET6 128 case K_INET6: 129 af = AF_INET6; 130 afname = argv[argc - 1] + 1; 131 break; 132 #endif 133 #ifndef SMALL 134 case K_ATALK: 135 af = AF_APPLETALK; 136 afname = argv[argc - 1] + 1; 137 break; 138 case K_ISO: 139 case K_OSI: 140 af = AF_ISO; 141 afname = argv[argc - 1] + 1; 142 break; 143 case K_MPLS: 144 af = AF_MPLS; 145 afname = argv[argc - 1] + 1; 146 break; 147 #endif /* SMALL */ 148 case K_LINK: 149 if (nolink) 150 goto bad; 151 af = AF_LINK; 152 afname = argv[argc - 1] + 1; 153 break; 154 default: 155 goto bad; 156 } 157 } 158 switch (argc) { 159 case 1: 160 case 0: 161 break; 162 default: 163 bad: 164 usage(argv[argc - 1]); 165 } 166 if (afnamep != NULL) 167 *afnamep = afname; 168 *afp = af; 169 *flagsp = flags; 170 } 171 172 /* 173 * Print routing tables. 174 */ 175 void 176 show(int argc, char *const *argv) 177 { 178 size_t needed; 179 int af, flags, mib[6]; 180 char *buf, *next, *lim; 181 struct rt_msghdr *rtm; 182 struct sockaddr *sa; 183 184 parse_show_opts(argc, argv, &af, &flags, NULL, true); 185 mib[0] = CTL_NET; 186 mib[1] = PF_ROUTE; 187 mib[2] = 0; 188 mib[3] = 0; 189 mib[4] = NET_RT_DUMP; 190 mib[5] = 0; 191 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 192 err(EXIT_FAILURE, "route-sysctl-estimate"); 193 buf = lim = NULL; 194 if (needed) { 195 if ((buf = malloc(needed)) == 0) 196 err(EXIT_FAILURE, "malloc"); 197 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 198 err(EXIT_FAILURE, "sysctl of routing table"); 199 lim = buf + needed; 200 } 201 202 printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : ""); 203 204 if (needed) { 205 for (next = buf; next < lim; next += rtm->rtm_msglen) { 206 rtm = (struct rt_msghdr *)next; 207 sa = (struct sockaddr *)(rtm + 1); 208 if ((rtm->rtm_flags & flags) != flags) 209 continue; 210 if (af == AF_UNSPEC || af == sa->sa_family) 211 p_rtentry(rtm); 212 } 213 free(buf); 214 } 215 } 216 217 218 /* column widths; each followed by one space */ 219 #ifndef INET6 220 #define WID_DST(af) 18 /* width of destination column */ 221 #define WID_GW(af) 18 /* width of gateway column */ 222 #else 223 /* width of destination/gateway column */ 224 #if 1 225 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */ 226 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 34 : 18) : 18) 227 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18) 228 #else 229 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */ 230 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18) 231 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18) 232 #endif 233 #endif /* INET6 */ 234 235 /* 236 * Print header for routing table columns. 237 */ 238 static void 239 pr_rthdr(int af) 240 { 241 242 printf("%-*.*s %-*.*s %-6.6s\n", 243 WID_DST(af), WID_DST(af), "Destination", 244 WID_GW(af), WID_GW(af), "Gateway", 245 "Flags"); 246 } 247 248 249 /* 250 * Print a routing table entry. 251 */ 252 static void 253 p_rtentry(struct rt_msghdr *rtm) 254 { 255 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 256 #ifdef notdef 257 static int masks_done, banner_printed; 258 #endif 259 static int old_af; 260 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST | 261 RTF_REJECT | RTF_LLINFO; 262 263 #ifdef notdef 264 /* for the moment, netmasks are skipped over */ 265 if (!banner_printed) { 266 printf("Netmasks:\n"); 267 banner_printed = 1; 268 } 269 if (masks_done == 0) { 270 if (rtm->rtm_addrs != RTA_DST ) { 271 masks_done = 1; 272 af = sa->sa_family; 273 } 274 } else 275 #endif 276 af = sa->sa_family; 277 if (old_af != af) { 278 old_af = af; 279 pr_family(af); 280 pr_rthdr(af); 281 } 282 if (rtm->rtm_addrs == RTA_DST) 283 p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1); 284 else { 285 struct sockaddr *nm; 286 287 if ((rtm->rtm_addrs & RTA_NETMASK) == 0) 288 nm = NULL; 289 else { 290 /* skip to gateway */ 291 nm = (struct sockaddr *) 292 (ROUNDUP(sa->sa_len) + (char *)sa); 293 /* skip over gateway to netmask */ 294 nm = (struct sockaddr *) 295 (ROUNDUP(nm->sa_len) + (char *)nm); 296 } 297 298 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af)); 299 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa); 300 p_sockaddr(sa, NULL, 0, WID_GW(af)); 301 } 302 p_flags(rtm->rtm_flags & interesting); 303 putchar('\n'); 304 } 305 306 307 /* 308 * Print address family header before a section of the routing table. 309 */ 310 static void 311 pr_family(int af) 312 { 313 const char *afname; 314 315 switch (af) { 316 case AF_INET: 317 afname = "Internet"; 318 break; 319 #ifdef INET6 320 case AF_INET6: 321 afname = "Internet6"; 322 break; 323 #endif /* INET6 */ 324 #ifndef SMALL 325 case AF_ISO: 326 afname = "ISO"; 327 break; 328 case AF_MPLS: 329 afname = "MPLS"; 330 break; 331 #endif /* SMALL */ 332 case AF_APPLETALK: 333 afname = "AppleTalk"; 334 break; 335 default: 336 afname = NULL; 337 break; 338 } 339 if (afname) 340 printf("\n%s:\n", afname); 341 else 342 printf("\nProtocol Family %d:\n", af); 343 } 344 345 346 static void 347 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width) 348 { 349 char workbuf[128]; 350 const char *cp; 351 352 switch(sa->sa_family) { 353 354 case AF_LINK: 355 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 356 NULL, 0, NI_NUMERICHOST) != 0) 357 strlcpy(workbuf, "invalid", sizeof(workbuf)); 358 cp = workbuf; 359 break; 360 361 case AF_INET: 362 cp = routename(sa, nm, flags); 363 break; 364 365 #ifdef INET6 366 case AF_INET6: 367 cp = routename(sa, nm, flags); 368 /* make sure numeric address is not truncated */ 369 if (strchr(cp, ':') != NULL && (int)strlen(cp) > width) 370 width = strlen(cp); 371 break; 372 #endif /* INET6 */ 373 374 #ifndef SMALL 375 case AF_MPLS: 376 { 377 struct sockaddr_mpls *smpls = (struct sockaddr_mpls *)sa; 378 union mpls_shim ms; 379 380 ms.s_addr = ntohl(smpls->smpls_addr.s_addr); 381 382 snprintf(workbuf, sizeof(workbuf), "%u", 383 ms.shim.label); 384 cp = workbuf; 385 } 386 break; 387 case AF_APPLETALK: 388 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 389 NULL, 0, NI_NUMERICHOST) != 0) 390 strlcpy(workbuf, "invalid", sizeof(workbuf)); 391 cp = workbuf; 392 break; 393 394 #endif /* SMALL */ 395 396 default: 397 { 398 u_char *s = (u_char *)sa->sa_data, *slim; 399 char *wp = workbuf, *wplim; 400 401 slim = sa->sa_len + (u_char *)sa; 402 wplim = wp + sizeof(workbuf) - 6; 403 wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family); 404 while (s < slim && wp < wplim) { 405 wp += snprintf(wp, wplim - wp, " %02x", *s++); 406 if (s < slim) 407 wp += snprintf(wp, wplim - wp, "%02x", *s++); 408 } 409 cp = workbuf; 410 } 411 } 412 if (width < 0 ) 413 printf("%s ", cp); 414 else { 415 if (nflag) 416 printf("%-*s ", width, cp); 417 else 418 printf("%-*.*s ", width, width, cp); 419 } 420 } 421 422 static void 423 p_flags(int f) 424 { 425 char name[33], *flags; 426 const struct bits *p = bits; 427 428 for (flags = name; p->b_mask; p++) 429 if (p->b_mask & f) 430 *flags++ = p->b_val; 431 else if (Sflag) 432 *flags++ = ' '; 433 *flags = '\0'; 434 printf("%-6.6s ", name); 435 } 436 437
Indexes created Fri Sep 26 20:09:58 GMT 2025