1 /* $NetBSD: show.c,v 1.28 2005/08/31 02:58:30 ginsbach 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 1.28 2005/08/31 02:58:30 ginsbach 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 #include <netns/ns.h> 52 53 #include <sys/sysctl.h> 54 55 #include <netdb.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <err.h> 61 62 #include "keywords.h" 63 #include "extern.h" 64 65 #define ROUNDUP(a) \ 66 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 67 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 68 69 /* 70 * Definitions for showing gateway flags. 71 */ 72 struct bits { 73 short 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 { 0 } 94 }; 95 96 static void pr_rthdr(int); 97 static void p_rtentry(struct rt_msghdr *); 98 static void pr_family(int); 99 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int ); 100 static void p_flags(int); 101 102 /* 103 * Print routing tables. 104 */ 105 void 106 show(int argc, char **argv) 107 { 108 size_t needed; 109 int af, mib[6]; 110 char *buf, *next, *lim; 111 struct rt_msghdr *rtm; 112 struct sockaddr *sa; 113 114 af = AF_UNSPEC; 115 if (argc > 1) { 116 argv++; 117 if (argc == 2 && **argv == '-') 118 switch (keyword(*argv + 1)) { 119 case K_INET: 120 af = AF_INET; 121 break; 122 #ifdef INET6 123 case K_INET6: 124 af = AF_INET6; 125 break; 126 #endif 127 #ifndef SMALL 128 case K_ATALK: 129 af = AF_APPLETALK; 130 break; 131 case K_XNS: 132 af = AF_NS; 133 break; 134 #endif /* SMALL */ 135 #if 0 136 /* XXX Links are never destinations */ 137 case K_LINK: 138 af = AF_LINK; 139 break; 140 #endif 141 #ifndef SMALL 142 case K_ISO: 143 case K_OSI: 144 af = AF_ISO; 145 break; 146 case K_X25: 147 af = AF_CCITT; 148 #endif /* SMALL */ 149 default: 150 goto bad; 151 } else 152 bad: usage(*argv); 153 } 154 mib[0] = CTL_NET; 155 mib[1] = PF_ROUTE; 156 mib[2] = 0; 157 mib[3] = 0; 158 mib[4] = NET_RT_DUMP; 159 mib[5] = 0; 160 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 161 err(1, "route-sysctl-estimate"); 162 buf = lim = NULL; 163 if (needed) { 164 if ((buf = malloc(needed)) == 0) 165 err(1, "malloc"); 166 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 167 err(1, "sysctl of routing table"); 168 lim = buf + needed; 169 } 170 171 printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : ""); 172 173 if (needed) { 174 for (next = buf; next < lim; next += rtm->rtm_msglen) { 175 rtm = (struct rt_msghdr *)next; 176 sa = (struct sockaddr *)(rtm + 1); 177 if (af == AF_UNSPEC || af == sa->sa_family) 178 p_rtentry(rtm); 179 } 180 free(buf); 181 } 182 } 183 184 185 /* column widths; each followed by one space */ 186 #ifndef INET6 187 #define WID_DST(af) 18 /* width of destination column */ 188 #define WID_GW(af) 18 /* width of gateway column */ 189 #else 190 /* width of destination/gateway column */ 191 #if 1 192 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */ 193 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 34 : 18) : 18) 194 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18) 195 #else 196 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */ 197 #define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18) 198 #define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18) 199 #endif 200 #endif /* INET6 */ 201 202 /* 203 * Print header for routing table columns. 204 */ 205 static void 206 pr_rthdr(int af) 207 { 208 209 printf("%-*.*s %-*.*s %-6.6s\n", 210 WID_DST(af), WID_DST(af), "Destination", 211 WID_GW(af), WID_GW(af), "Gateway", 212 "Flags"); 213 } 214 215 216 /* 217 * Print a routing table entry. 218 */ 219 static void 220 p_rtentry(struct rt_msghdr *rtm) 221 { 222 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 223 #ifdef notdef 224 static int masks_done, banner_printed; 225 #endif 226 static int old_af; 227 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST | RTF_REJECT; 228 229 #ifdef notdef 230 /* for the moment, netmasks are skipped over */ 231 if (!banner_printed) { 232 printf("Netmasks:\n"); 233 banner_printed = 1; 234 } 235 if (masks_done == 0) { 236 if (rtm->rtm_addrs != RTA_DST ) { 237 masks_done = 1; 238 af = sa->sa_family; 239 } 240 } else 241 #endif 242 af = sa->sa_family; 243 if (old_af != af) { 244 old_af = af; 245 pr_family(af); 246 pr_rthdr(af); 247 } 248 if (rtm->rtm_addrs == RTA_DST) 249 p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1); 250 else { 251 struct sockaddr *nm; 252 253 if ((rtm->rtm_addrs & RTA_NETMASK) == 0) 254 nm = NULL; 255 else { 256 /* skip to gateway */ 257 nm = (struct sockaddr *) 258 (ROUNDUP(sa->sa_len) + (char *)sa); 259 /* skip over gateway to netmask */ 260 nm = (struct sockaddr *) 261 (ROUNDUP(nm->sa_len) + (char *)nm); 262 } 263 264 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af)); 265 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa); 266 p_sockaddr(sa, NULL, 0, WID_GW(af)); 267 } 268 p_flags(rtm->rtm_flags & interesting); 269 putchar('\n'); 270 } 271 272 273 /* 274 * Print address family header before a section of the routing table. 275 */ 276 static void 277 pr_family(int af) 278 { 279 const char *afname; 280 281 switch (af) { 282 case AF_INET: 283 afname = "Internet"; 284 break; 285 #ifdef INET6 286 case AF_INET6: 287 afname = "Internet6"; 288 break; 289 #endif /* INET6 */ 290 #ifndef SMALL 291 case AF_NS: 292 afname = "XNS"; 293 break; 294 case AF_ISO: 295 afname = "ISO"; 296 break; 297 case AF_CCITT: 298 afname = "X.25"; 299 break; 300 #endif /* SMALL */ 301 case AF_APPLETALK: 302 afname = "AppleTalk"; 303 break; 304 default: 305 afname = NULL; 306 break; 307 } 308 if (afname) 309 printf("\n%s:\n", afname); 310 else 311 printf("\nProtocol Family %d:\n", af); 312 } 313 314 315 static void 316 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width) 317 { 318 char workbuf[128]; 319 const char *cp; 320 321 switch(sa->sa_family) { 322 323 case AF_LINK: 324 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 325 NULL, 0, NI_NUMERICHOST) != 0) 326 strlcpy(workbuf, "invalid", sizeof(workbuf)); 327 cp = workbuf; 328 break; 329 330 case AF_INET: 331 cp = routename(sa, nm, flags); 332 break; 333 334 #ifdef INET6 335 case AF_INET6: 336 cp = routename(sa, nm, flags); 337 /* make sure numeric address is not truncated */ 338 if (strchr(cp, ':') != NULL && strlen(cp) > width) 339 width = strlen(cp); 340 break; 341 #endif /* INET6 */ 342 343 #ifndef SMALL 344 case AF_NS: 345 cp = ns_print((struct sockaddr_ns *)sa); 346 break; 347 #endif /* SMALL */ 348 349 default: 350 { 351 u_char *s = (u_char *)sa->sa_data, *slim; 352 char *wp = workbuf, *wplim; 353 354 slim = sa->sa_len + (u_char *)sa; 355 wplim = wp + sizeof(workbuf) - 6; 356 wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family); 357 while (s < slim && wp < wplim) { 358 wp += snprintf(wp, wplim - wp, " %02x", *s++); 359 if (s < slim) 360 wp += snprintf(wp, wplim - wp, "%02x", *s++); 361 } 362 cp = workbuf; 363 } 364 } 365 if (width < 0 ) 366 printf("%s ", cp); 367 else { 368 if (nflag) 369 printf("%-*s ", width, cp); 370 else 371 printf("%-*.*s ", width, width, cp); 372 } 373 } 374 375 static void 376 p_flags(int f) 377 { 378 char name[33], *flags; 379 const struct bits *p = bits; 380 381 for (flags = name; p->b_mask; p++) 382 if (p->b_mask & f) 383 *flags++ = p->b_val; 384 *flags = '\0'; 385 printf("%-6.6s ", name); 386 } 387 388