1 /* 2 * $OpenBSD: show.c,v 1.26 2003/08/26 08:33:12 itojun Exp $ 3 * $NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $ 4 */ 5 /* 6 * Copyright (c) 1983, 1988, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/protosw.h> 36 #include <sys/socket.h> 37 #include <sys/mbuf.h> 38 39 #include <net/if.h> 40 #include <net/if_dl.h> 41 #include <net/if_types.h> 42 #include <net/route.h> 43 #include <netinet/in.h> 44 #include <arpa/inet.h> 45 46 #include <sys/sysctl.h> 47 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include <netdb.h> 54 55 #include "extern.h" 56 #include "keywords.h" 57 58 #define ROUNDUP(a) \ 59 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 60 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 61 62 /* 63 * Definitions for showing gateway flags. 64 */ 65 struct bits { 66 int b_mask; 67 char b_val; 68 }; 69 static const struct bits bits[] = { 70 { RTF_UP, 'U' }, 71 { RTF_GATEWAY, 'G' }, 72 { RTF_HOST, 'H' }, 73 { RTF_REJECT, 'R' }, 74 { RTF_BLACKHOLE, 'B' }, 75 { RTF_DYNAMIC, 'D' }, 76 { RTF_MODIFIED, 'M' }, 77 { RTF_DONE, 'd' }, /* Completed -- for routing messages only */ 78 { RTF_CLONING, 'C' }, 79 { RTF_XRESOLVE, 'X' }, 80 { RTF_LLINFO, 'L' }, 81 { RTF_STATIC, 'S' }, 82 { RTF_PROTO1, '1' }, 83 { RTF_PROTO2, '2' }, 84 { RTF_PROTO3, '3' }, 85 { 0, 0 } 86 }; 87 88 static void p_rtentry(struct rt_msghdr *); 89 static int p_sockaddr(struct sockaddr *, int, int); 90 static void p_flags(int, const char *); 91 static void pr_rthdr(void); 92 static void pr_family(int); 93 94 /* 95 * Print routing tables. 96 */ 97 void 98 show(int argc, char *argv[]) 99 { 100 struct rt_msghdr *rtm; 101 char *buf = NULL, *next, *lim = NULL; 102 size_t needed; 103 int mib[7], af = 0; 104 int miblen; 105 struct sockaddr *sa; 106 107 if (argc > 1) { 108 argv++; 109 if (argc == 2 && **argv == '-') { 110 switch (keyword(*argv + 1)) { 111 case K_INET: 112 af = AF_INET; 113 break; 114 #ifdef INET6 115 case K_INET6: 116 af = AF_INET6; 117 break; 118 #endif 119 case K_XNS: 120 af = AF_NS; 121 break; 122 case K_LINK: 123 af = AF_LINK; 124 break; 125 case K_ISO: 126 case K_OSI: 127 af = AF_ISO; 128 break; 129 case K_X25: 130 af = AF_CCITT; 131 break; 132 default: 133 goto bad; 134 } 135 } else 136 bad: usage(*argv); 137 } 138 mib[0] = CTL_NET; 139 mib[1] = PF_ROUTE; 140 mib[2] = 0; 141 mib[3] = 0; 142 mib[4] = NET_RT_DUMP; 143 mib[5] = 0; 144 if (cpuflag >= 0) { 145 mib[6] = cpuflag; 146 miblen = 7; 147 } else { 148 miblen = 6; 149 } 150 if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0) { 151 perror("route-sysctl-estimate"); 152 exit(1); 153 } 154 if (needed > 0) { 155 if ((buf = malloc(needed)) == NULL) { 156 printf("out of space\n"); 157 exit(1); 158 } 159 if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) { 160 perror("sysctl of routing table"); 161 exit(1); 162 } 163 lim = buf + needed; 164 } 165 166 printf("Routing tables\n"); 167 168 if (buf != NULL) { 169 for (next = buf; next < lim; next += rtm->rtm_msglen) { 170 rtm = (struct rt_msghdr *)next; 171 sa = (struct sockaddr *)(rtm + 1); 172 if (af != 0 && sa->sa_family != af) 173 continue; 174 p_rtentry(rtm); 175 } 176 free(buf); 177 } 178 } 179 180 /* column widths; each followed by one space */ 181 #define WID_DST (nflag ? 20 : 32) /* destination column width */ 182 #define WID_GW (nflag ? 20 : 32) /* gateway column width */ 183 184 /* 185 * Print header for routing table columns. 186 */ 187 static void 188 pr_rthdr(void) 189 { 190 printf("%-*.*s %-*.*s %-6.6s\n", 191 WID_DST, WID_DST, "Destination", 192 WID_GW, WID_GW, "Gateway", 193 "Flags"); 194 } 195 196 /* 197 * Print a routing table entry. 198 */ 199 static void 200 p_rtentry(struct rt_msghdr *rtm) 201 { 202 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 203 #ifdef notdef 204 static int masks_done, banner_printed; 205 #endif 206 static int old_af; 207 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST; 208 int width; 209 210 #ifdef notdef 211 /* for the moment, netmasks are skipped over */ 212 if (!banner_printed) { 213 printf("Netmasks:\n"); 214 banner_printed = 1; 215 } 216 if (masks_done == 0) { 217 if (rtm->rtm_addrs != RTA_DST) { 218 masks_done = 1; 219 af = sa->sa_family; 220 } 221 } else 222 #endif 223 af = sa->sa_family; 224 if (old_af != af) { 225 old_af = af; 226 pr_family(af); 227 pr_rthdr(); 228 } 229 230 /* 231 * Print the information. If wflag is set p_sockaddr() can return 232 * a wider width then specified and we try to fit the second 233 * address in any remaining space so the flags still lines up. 234 */ 235 if (rtm->rtm_addrs == RTA_DST) { 236 p_sockaddr(sa, 0, WID_DST + WID_GW + 2); 237 } else { 238 width = p_sockaddr(sa, rtm->rtm_flags, WID_DST); 239 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa); 240 p_sockaddr(sa, 0, WID_GW + WID_DST - width); 241 } 242 p_flags(rtm->rtm_flags & interesting, "%-6.6s "); 243 putchar('\n'); 244 } 245 246 /* 247 * Print address family header before a section of the routing table. 248 */ 249 static void 250 pr_family(int af) 251 { 252 const char *afname; 253 254 switch (af) { 255 case AF_INET: 256 afname = "Internet"; 257 break; 258 #ifdef INET6 259 case AF_INET6: 260 afname = "Internet6"; 261 break; 262 #endif /* INET6 */ 263 case AF_NS: 264 afname = "XNS"; 265 break; 266 case AF_IPX: 267 afname = "IPX"; 268 break; 269 case AF_ISO: 270 afname = "ISO"; 271 break; 272 case AF_CCITT: 273 afname = "X.25"; 274 break; 275 default: 276 afname = NULL; 277 break; 278 } 279 if (afname != NULL) 280 printf("\n%s:\n", afname); 281 else 282 printf("\nProtocol Family %d:\n", af); 283 } 284 285 static int 286 p_sockaddr(struct sockaddr *sa, int flags, int width) 287 { 288 char workbuf[128]; 289 char *cp = workbuf; 290 const char *cplim; 291 int len = sizeof(workbuf); 292 int count; 293 294 switch(sa->sa_family) { 295 296 case AF_LINK: 297 { 298 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 299 300 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 && 301 sdl->sdl_slen == 0) { 302 snprintf(workbuf, sizeof(workbuf), 303 "link#%d", sdl->sdl_index); 304 } else { 305 switch (sdl->sdl_type) { 306 case IFT_ETHER: 307 case IFT_L2VLAN: 308 case IFT_CARP: 309 { 310 int i; 311 u_char *lla = (u_char *)sdl->sdl_data + 312 sdl->sdl_nlen; 313 314 cplim = ""; 315 for (i = 0; i < sdl->sdl_alen; i++, lla++) { 316 snprintf(cp, len, "%s%02x", 317 cplim, *lla); 318 len -= strlen(cp); 319 cp += strlen(cp); 320 if (len <= 0) 321 break; /* overflow */ 322 cplim = ":"; 323 } 324 cp = workbuf; 325 break; 326 } 327 default: 328 cp = link_ntoa(sdl); 329 break; 330 } 331 } 332 break; 333 } 334 335 case AF_INET: 336 { 337 struct sockaddr_in *in = (struct sockaddr_in *)sa; 338 339 if (in->sin_addr.s_addr == 0) { 340 /* cp points to workbuf */ 341 strncpy(cp, "default", len); 342 } else 343 cp = (flags & RTF_HOST) ? routename(sa) : netname(sa); 344 break; 345 } 346 347 #ifdef INET6 348 case AF_INET6: 349 { 350 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa; 351 352 if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) { 353 /* cp points to workbuf */ 354 strncpy(cp, "default", len); 355 } else { 356 cp = ((flags & RTF_HOST) ? routename(sa) 357 : netname(sa)); 358 } 359 /* make sure numeric address is not truncated */ 360 if (strchr(cp, ':') != NULL && 361 (width < 0 || strlen(cp) > (size_t)width)) 362 width = strlen(cp); 363 break; 364 } 365 #endif /* INET6 */ 366 367 default: 368 { 369 u_char *s = (u_char *)sa->sa_data, *slim; 370 371 slim = sa->sa_len + (u_char *) sa; 372 cplim = cp + sizeof(workbuf) - 6; 373 snprintf(cp, len, "(%d)", sa->sa_family); 374 len -= strlen(cp); 375 cp += strlen(cp); 376 if (len <= 0) { 377 cp = workbuf; 378 break; /* overflow */ 379 } 380 while (s < slim && cp < cplim) { 381 snprintf(cp, len, " %02x", *s++); 382 len -= strlen(cp); 383 cp += strlen(cp); 384 if (len <= 0) 385 break; /* overflow */ 386 if (s < slim) { 387 snprintf(cp, len, "%02x", *s++); 388 len -= strlen(cp); 389 cp += strlen(cp); 390 if (len <= 0) 391 break; /* overflow */ 392 } 393 } 394 cp = workbuf; 395 } 396 } 397 if (width < 0) { 398 count = printf("%s ", cp); 399 } else { 400 if (nflag || wflag) 401 count = printf("%-*s ", width, cp); 402 else 403 count = printf("%-*.*s ", width, width, cp); 404 } 405 return(count); 406 } 407 408 static void 409 p_flags(int f, const char *format) 410 { 411 char name[33], *flags; 412 const struct bits *p = bits; 413 414 for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) { 415 if (p->b_mask & f) 416 *flags++ = p->b_val; 417 } 418 *flags = '\0'; 419 printf(format, name); 420 } 421