show.c revision 1.34
1 /* $NetBSD: show.c,v 1.34 2006/09/23 23:01:01 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 1.34 2006/09/23 23:01:01 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 <net/if.h> 47 #include <net/if_dl.h> 48 #include <net/if_types.h> 49 #include <net/route.h> 50 #include <netinet/in.h> 51 52 #include <sys/sysctl.h> 53 54 #include <netdb.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 #include <err.h> 60 61 #include "keywords.h" 62 #include "extern.h" 63 64 #define ROUNDUP(a) \ 65 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 66 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 67 68 /* 69 * Definitions for showing gateway flags. 70 */ 71 struct bits { 72 short b_mask; 73 char b_val; 74 }; 75 static const struct bits bits[] = { 76 { RTF_UP, 'U' }, 77 { RTF_GATEWAY, 'G' }, 78 { RTF_HOST, 'H' }, 79 { RTF_REJECT, 'R' }, 80 { RTF_DYNAMIC, 'D' }, 81 { RTF_MODIFIED, 'M' }, 82 { RTF_DONE, 'd' }, /* Completed -- for routing messages only */ 83 { RTF_MASK, 'm' }, /* Mask Present -- for routing messages only */ 84 { RTF_CLONING, 'C' }, 85 { RTF_XRESOLVE, 'X' }, 86 { RTF_LLINFO, 'L' }, 87 { RTF_STATIC, 'S' }, 88 { RTF_BLACKHOLE, 'B' }, 89 { RTF_CLONED, 'c' }, 90 { RTF_PROTO1, '1' }, 91 { RTF_PROTO2, '2' }, 92 { 0 } 93 }; 94 95 static void pr_rthdr(int); 96 static void p_rtentry(struct rt_msghdr *); 97 static void pr_family(int); 98 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int ); 99 static void p_flags(int); 100 101 void 102 parse_show_opts(int argc, char **argv, int *afp, int *flagsp, 103 const char **afnamep, int nolink) 104 { 105 const char *afname = "unspec"; 106 int af, flags; 107 108 flags = 0; 109 af = AF_UNSPEC; 110 for (; argc >= 2; argc--) { 111 if (*argv[argc - 1] != '-') 112 goto bad; 113 switch (keyword(argv[argc - 1] + 1)) { 114 case K_HOST: 115 flags |= RTF_HOST; 116 break; 117 case K_LLINFO: 118 flags |= RTF_LLINFO; 119 break; 120 case K_INET: 121 af = AF_INET; 122 afname = argv[argc - 1] + 1; 123 break; 124 #ifdef INET6 125 case K_INET6: 126 af = AF_INET6; 127 afname = argv[argc - 1] + 1; 128 break; 129 #endif 130 #ifndef SMALL 131 case K_ATALK: 132 af = AF_APPLETALK; 133 afname = argv[argc - 1] + 1; 134 break; 135 case K_ISO: 136 case K_OSI: 137 af = AF_ISO; 138 afname = argv[argc - 1] + 1; 139 break; 140 #endif /* SMALL */ 141 case K_LINK: 142 if (nolink) 143 goto bad; 144 af = AF_LINK; 145 afname = argv[argc - 1] + 1; 146 break; 147 default: 148 goto bad; 149 } 150 } 151 switch (argc) { 152 case 1: 153 case 0: 154 break; 155 default: 156 bad: 157 usage(argv[argc - 1]); 158 } 159 if (afnamep != NULL) 160 *afnamep = afname; 161 *afp = af; 162 *flagsp = flags; 163 } 164 165 /* 166 * Print routing tables. 167 */ 168 void 169 show(int argc, char **argv) 170 { 171 size_t needed; 172 int af, flags, mib[6]; 173 char *buf, *next, *lim; 174 struct rt_msghdr *rtm; 175 struct sockaddr *sa; 176 177 parse_show_opts(argc, argv, &af, &flags, NULL, 1); 178 mib[0] = CTL_NET; 179 mib[1] = PF_ROUTE; 180 mib[2] = 0; 181 mib[3] = 0; 182 mib[4] = NET_RT_DUMP; 183 mib[5] = 0; 184 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 185 err(1, "route-sysctl-estimate"); 186 buf = lim = NULL; 187 if (needed) { 188 if ((buf = malloc(needed)) == 0) 189 err(1, "malloc"); 190 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 191 err(1, "sysctl of routing table"); 192 lim = buf + needed; 193 } 194 195 printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : ""); 196 197 if (needed) { 198 for (next = buf; next < lim; next += rtm->rtm_msglen) { 199 rtm = (struct rt_msghdr *)next; 200 sa = (struct sockaddr *)(rtm + 1); 201 if ((rtm->rtm_flags & flags) != flags) 202 continue; 203 if (af == AF_UNSPEC || af == sa->sa_family) 204 p_rtentry(rtm); 205 } 206 free(buf); 207 } 208 } 209 210 211 /* column widths; each followed by one space */ 212 #ifndef INET6 213 #define WID_DST(af) 18 /* width of destination column */ 214 #define WID_GW(af) 18 /* width of gateway column */ 215 #else 216 /* width of destination/gateway column */ 217 #if 1 218 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */ 219 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 34 : 18) : 18) 220 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18) 221 #else 222 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */ 223 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18) 224 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18) 225 #endif 226 #endif /* INET6 */ 227 228 /* 229 * Print header for routing table columns. 230 */ 231 static void 232 pr_rthdr(int af) 233 { 234 235 printf("%-*.*s %-*.*s %-6.6s\n", 236 WID_DST(af), WID_DST(af), "Destination", 237 WID_GW(af), WID_GW(af), "Gateway", 238 "Flags"); 239 } 240 241 242 /* 243 * Print a routing table entry. 244 */ 245 static void 246 p_rtentry(struct rt_msghdr *rtm) 247 { 248 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 249 #ifdef notdef 250 static int masks_done, banner_printed; 251 #endif 252 static int old_af; 253 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST | 254 RTF_REJECT | RTF_LLINFO; 255 256 #ifdef notdef 257 /* for the moment, netmasks are skipped over */ 258 if (!banner_printed) { 259 printf("Netmasks:\n"); 260 banner_printed = 1; 261 } 262 if (masks_done == 0) { 263 if (rtm->rtm_addrs != RTA_DST ) { 264 masks_done = 1; 265 af = sa->sa_family; 266 } 267 } else 268 #endif 269 af = sa->sa_family; 270 if (old_af != af) { 271 old_af = af; 272 pr_family(af); 273 pr_rthdr(af); 274 } 275 if (rtm->rtm_addrs == RTA_DST) 276 p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1); 277 else { 278 struct sockaddr *nm; 279 280 if ((rtm->rtm_addrs & RTA_NETMASK) == 0) 281 nm = NULL; 282 else { 283 /* skip to gateway */ 284 nm = (struct sockaddr *) 285 (ROUNDUP(sa->sa_len) + (char *)sa); 286 /* skip over gateway to netmask */ 287 nm = (struct sockaddr *) 288 (ROUNDUP(nm->sa_len) + (char *)nm); 289 } 290 291 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af)); 292 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa); 293 p_sockaddr(sa, NULL, 0, WID_GW(af)); 294 } 295 p_flags(rtm->rtm_flags & interesting); 296 putchar('\n'); 297 } 298 299 300 /* 301 * Print address family header before a section of the routing table. 302 */ 303 static void 304 pr_family(int af) 305 { 306 const char *afname; 307 308 switch (af) { 309 case AF_INET: 310 afname = "Internet"; 311 break; 312 #ifdef INET6 313 case AF_INET6: 314 afname = "Internet6"; 315 break; 316 #endif /* INET6 */ 317 #ifndef SMALL 318 case AF_ISO: 319 afname = "ISO"; 320 break; 321 #endif /* SMALL */ 322 case AF_APPLETALK: 323 afname = "AppleTalk"; 324 break; 325 default: 326 afname = NULL; 327 break; 328 } 329 if (afname) 330 printf("\n%s:\n", afname); 331 else 332 printf("\nProtocol Family %d:\n", af); 333 } 334 335 336 static void 337 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width) 338 { 339 char workbuf[128]; 340 const char *cp; 341 342 switch(sa->sa_family) { 343 344 case AF_LINK: 345 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 346 NULL, 0, NI_NUMERICHOST) != 0) 347 strlcpy(workbuf, "invalid", sizeof(workbuf)); 348 cp = workbuf; 349 break; 350 351 case AF_INET: 352 cp = routename(sa, nm, flags); 353 break; 354 355 #ifdef INET6 356 case AF_INET6: 357 cp = routename(sa, nm, flags); 358 /* make sure numeric address is not truncated */ 359 if (strchr(cp, ':') != NULL && strlen(cp) > width) 360 width = strlen(cp); 361 break; 362 #endif /* INET6 */ 363 364 #ifndef SMALL 365 #endif /* SMALL */ 366 367 default: 368 { 369 u_char *s = (u_char *)sa->sa_data, *slim; 370 char *wp = workbuf, *wplim; 371 372 slim = sa->sa_len + (u_char *)sa; 373 wplim = wp + sizeof(workbuf) - 6; 374 wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family); 375 while (s < slim && wp < wplim) { 376 wp += snprintf(wp, wplim - wp, " %02x", *s++); 377 if (s < slim) 378 wp += snprintf(wp, wplim - wp, "%02x", *s++); 379 } 380 cp = workbuf; 381 } 382 } 383 if (width < 0 ) 384 printf("%s ", cp); 385 else { 386 if (nflag) 387 printf("%-*s ", width, cp); 388 else 389 printf("%-*.*s ", width, width, cp); 390 } 391 } 392 393 static void 394 p_flags(int f) 395 { 396 char name[33], *flags; 397 const struct bits *p = bits; 398 399 for (flags = name; p->b_mask; p++) 400 if (p->b_mask & f) 401 *flags++ = p->b_val; 402 else if (Sflag) 403 *flags++ = ' '; 404 *flags = '\0'; 405 printf("%-6.6s ", name); 406 } 407 408
Indexes created Tue Sep 30 11:09:46 GMT 2025