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 /* 59 * Definitions for showing gateway flags. 60 */ 61 struct bits { 62 int b_mask; 63 char b_val; 64 }; 65 static const struct bits bits[] = { 66 { RTF_UP, 'U' }, 67 { RTF_GATEWAY, 'G' }, 68 { RTF_HOST, 'H' }, 69 { RTF_REJECT, 'R' }, 70 { RTF_BLACKHOLE, 'B' }, 71 { RTF_DYNAMIC, 'D' }, 72 { RTF_MODIFIED, 'M' }, 73 { RTF_DONE, 'd' }, /* Completed -- for routing messages only */ 74 { RTF_CLONING, 'C' }, 75 { RTF_XRESOLVE, 'X' }, 76 { RTF_LLINFO, 'L' }, 77 { RTF_STATIC, 'S' }, 78 { RTF_PROTO1, '1' }, 79 { RTF_PROTO2, '2' }, 80 { RTF_PROTO3, '3' }, 81 { 0, 0 } 82 }; 83 84 static void p_rtentry(struct rt_msghdr *); 85 static int p_sockaddr(struct sockaddr *, int, int); 86 static void p_flags(int, const char *); 87 static void pr_rthdr(void); 88 static void pr_family(int); 89 90 /* 91 * Print routing tables. 92 */ 93 void 94 show(int argc, char *argv[]) 95 { 96 struct rt_msghdr *rtm; 97 char *buf = NULL, *next, *lim = NULL; 98 size_t needed; 99 int mib[7], af = 0; 100 int miblen; 101 struct sockaddr *sa; 102 103 if (argc > 1) { 104 argv++; 105 if (argc == 2 && **argv == '-') { 106 switch (keyword(*argv + 1)) { 107 case K_INET: 108 af = AF_INET; 109 break; 110 #ifdef INET6 111 case K_INET6: 112 af = AF_INET6; 113 break; 114 #endif 115 case K_LINK: 116 af = AF_LINK; 117 break; 118 case K_ISO: 119 case K_OSI: 120 af = AF_ISO; 121 break; 122 case K_X25: 123 af = AF_CCITT; 124 break; 125 default: 126 goto bad; 127 } 128 } else 129 bad: usage(*argv); 130 } 131 mib[0] = CTL_NET; 132 mib[1] = PF_ROUTE; 133 mib[2] = 0; 134 mib[3] = 0; 135 mib[4] = NET_RT_DUMP; 136 mib[5] = 0; 137 if (cpuflag >= 0) { 138 mib[6] = cpuflag; 139 miblen = 7; 140 } else { 141 miblen = 6; 142 } 143 if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0) { 144 perror("route-sysctl-estimate"); 145 exit(1); 146 } 147 if (needed > 0) { 148 if ((buf = malloc(needed)) == NULL) { 149 printf("out of space\n"); 150 exit(1); 151 } 152 if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) { 153 perror("sysctl of routing table"); 154 exit(1); 155 } 156 lim = buf + needed; 157 } 158 159 printf("Routing tables\n"); 160 161 if (buf != NULL) { 162 for (next = buf; next < lim; next += rtm->rtm_msglen) { 163 rtm = (struct rt_msghdr *)next; 164 sa = (struct sockaddr *)(rtm + 1); 165 if (af != 0 && sa->sa_family != af) 166 continue; 167 p_rtentry(rtm); 168 } 169 free(buf); 170 } 171 } 172 173 /* column widths; each followed by one space */ 174 #define WID_DST (nflag ? 20 : 32) /* destination column width */ 175 #define WID_GW (nflag ? 20 : 32) /* gateway column width */ 176 177 /* 178 * Print header for routing table columns. 179 */ 180 static void 181 pr_rthdr(void) 182 { 183 printf("%-*.*s %-*.*s %-6.6s\n", 184 WID_DST, WID_DST, "Destination", 185 WID_GW, WID_GW, "Gateway", 186 "Flags"); 187 } 188 189 /* 190 * Print a routing table entry. 191 */ 192 static void 193 p_rtentry(struct rt_msghdr *rtm) 194 { 195 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 196 #ifdef notdef 197 static int masks_done, banner_printed; 198 #endif 199 static int old_af; 200 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST; 201 int width; 202 203 #ifdef notdef 204 /* for the moment, netmasks are skipped over */ 205 if (!banner_printed) { 206 printf("Netmasks:\n"); 207 banner_printed = 1; 208 } 209 if (masks_done == 0) { 210 if (rtm->rtm_addrs != RTA_DST) { 211 masks_done = 1; 212 af = sa->sa_family; 213 } 214 } else 215 #endif 216 af = sa->sa_family; 217 if (old_af != af) { 218 old_af = af; 219 pr_family(af); 220 pr_rthdr(); 221 } 222 223 /* 224 * Print the information. If wflag is set p_sockaddr() can return 225 * a wider width then specified and we try to fit the second 226 * address in any remaining space so the flags still lines up. 227 */ 228 if (rtm->rtm_addrs == RTA_DST) { 229 p_sockaddr(sa, 0, WID_DST + WID_GW + 2); 230 } else { 231 width = p_sockaddr(sa, rtm->rtm_flags, WID_DST); 232 sa = (struct sockaddr *)(RT_ROUNDUP(sa->sa_len) + (char *)sa); 233 p_sockaddr(sa, 0, WID_GW + WID_DST - width); 234 } 235 p_flags(rtm->rtm_flags & interesting, "%-6.6s "); 236 putchar('\n'); 237 } 238 239 /* 240 * Print address family header before a section of the routing table. 241 */ 242 static void 243 pr_family(int af) 244 { 245 const char *afname; 246 247 switch (af) { 248 case AF_INET: 249 afname = "Internet"; 250 break; 251 #ifdef INET6 252 case AF_INET6: 253 afname = "Internet6"; 254 break; 255 #endif /* INET6 */ 256 case AF_ISO: 257 afname = "ISO"; 258 break; 259 case AF_CCITT: 260 afname = "X.25"; 261 break; 262 default: 263 afname = NULL; 264 break; 265 } 266 if (afname != NULL) 267 printf("\n%s:\n", afname); 268 else 269 printf("\nProtocol Family %d:\n", af); 270 } 271 272 static int 273 p_sockaddr(struct sockaddr *sa, int flags, int width) 274 { 275 char workbuf[128]; 276 char *cp = workbuf; 277 const char *cplim; 278 int len = sizeof(workbuf); 279 int count; 280 281 switch(sa->sa_family) { 282 283 case AF_LINK: 284 { 285 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 286 287 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 && 288 sdl->sdl_slen == 0) { 289 snprintf(workbuf, sizeof(workbuf), 290 "link#%d", sdl->sdl_index); 291 } else { 292 switch (sdl->sdl_type) { 293 case IFT_ETHER: 294 case IFT_L2VLAN: 295 case IFT_CARP: 296 { 297 int i; 298 u_char *lla = (u_char *)sdl->sdl_data + 299 sdl->sdl_nlen; 300 301 cplim = ""; 302 for (i = 0; i < sdl->sdl_alen; i++, lla++) { 303 snprintf(cp, len, "%s%02x", 304 cplim, *lla); 305 len -= strlen(cp); 306 cp += strlen(cp); 307 if (len <= 0) 308 break; /* overflow */ 309 cplim = ":"; 310 } 311 cp = workbuf; 312 break; 313 } 314 default: 315 cp = link_ntoa(sdl); 316 break; 317 } 318 } 319 break; 320 } 321 322 case AF_INET: 323 { 324 struct sockaddr_in *in = (struct sockaddr_in *)sa; 325 326 if (in->sin_addr.s_addr == 0) { 327 /* cp points to workbuf */ 328 strncpy(cp, "default", len); 329 } else 330 cp = (flags & RTF_HOST) ? routename(sa) : netname(sa); 331 break; 332 } 333 334 #ifdef INET6 335 case AF_INET6: 336 { 337 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa; 338 339 if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) { 340 /* cp points to workbuf */ 341 strncpy(cp, "default", len); 342 } else { 343 cp = ((flags & RTF_HOST) ? routename(sa) 344 : netname(sa)); 345 } 346 /* make sure numeric address is not truncated */ 347 if (strchr(cp, ':') != NULL && 348 (width < 0 || strlen(cp) > (size_t)width)) 349 width = strlen(cp); 350 break; 351 } 352 #endif /* INET6 */ 353 354 default: 355 { 356 u_char *s = (u_char *)sa->sa_data, *slim; 357 358 slim = sa->sa_len + (u_char *) sa; 359 cplim = cp + sizeof(workbuf) - 6; 360 snprintf(cp, len, "(%d)", sa->sa_family); 361 len -= strlen(cp); 362 cp += strlen(cp); 363 if (len <= 0) { 364 cp = workbuf; 365 break; /* overflow */ 366 } 367 while (s < slim && cp < cplim) { 368 snprintf(cp, len, " %02x", *s++); 369 len -= strlen(cp); 370 cp += strlen(cp); 371 if (len <= 0) 372 break; /* overflow */ 373 if (s < slim) { 374 snprintf(cp, len, "%02x", *s++); 375 len -= strlen(cp); 376 cp += strlen(cp); 377 if (len <= 0) 378 break; /* overflow */ 379 } 380 } 381 cp = workbuf; 382 } 383 } 384 if (width < 0) { 385 count = printf("%s ", cp); 386 } else { 387 if (nflag || wflag) 388 count = printf("%-*s ", width, cp); 389 else 390 count = printf("%-*.*s ", width, width, cp); 391 } 392 return(count); 393 } 394 395 static void 396 p_flags(int f, const char *format) 397 { 398 char name[33], *flags; 399 const struct bits *p = bits; 400 401 for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++) { 402 if (p->b_mask & f) 403 *flags++ = p->b_val; 404 } 405 *flags = '\0'; 406 printf(format, name); 407 } 408