1 /* $NetBSD: show.c,v 1.22 2005/02/05 14:05:23 xtraeme 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 1.22 2005/02/05 14:05:23 xtraeme 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 "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(void); 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 /* 102 * Print routing tables. 103 */ 104 void 105 show(int argc, char **argv) 106 { 107 size_t needed; 108 int mib[6]; 109 char *buf, *next, *lim; 110 struct rt_msghdr *rtm; 111 112 mib[0] = CTL_NET; 113 mib[1] = PF_ROUTE; 114 mib[2] = 0; 115 mib[3] = 0; 116 mib[4] = NET_RT_DUMP; 117 mib[5] = 0; 118 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) { 119 perror("route-sysctl-estimate"); 120 exit(1); 121 } 122 if ((buf = malloc(needed)) == 0) 123 err(1, NULL); 124 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 125 err(1, "sysctl of routing table"); 126 lim = buf + needed; 127 128 printf("Routing tables\n"); 129 130 /* for (i = 0; i <= AF_MAX; i++) ??? */ 131 { 132 for (next = buf; next < lim; next += rtm->rtm_msglen) { 133 rtm = (struct rt_msghdr *)next; 134 p_rtentry(rtm); 135 } 136 } 137 } 138 139 140 /* column widths; each followed by one space */ 141 #define WID_DST 17 /* width of destination column */ 142 #define WID_GW 18 /* width of gateway column */ 143 144 /* 145 * Print header for routing table columns. 146 */ 147 static void 148 pr_rthdr(void) 149 { 150 151 printf("%-*.*s %-*.*s %-6.6s\n", 152 WID_DST, WID_DST, "Destination", 153 WID_GW, WID_GW, "Gateway", 154 "Flags"); 155 } 156 157 158 /* 159 * Print a routing table entry. 160 */ 161 static void 162 p_rtentry(struct rt_msghdr *rtm) 163 { 164 struct sockaddr *sa = (struct sockaddr *)(rtm + 1); 165 #ifdef notdef 166 static int masks_done, banner_printed; 167 #endif 168 static int old_af; 169 int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST | RTF_REJECT; 170 171 #ifdef notdef 172 /* for the moment, netmasks are skipped over */ 173 if (!banner_printed) { 174 printf("Netmasks:\n"); 175 banner_printed = 1; 176 } 177 if (masks_done == 0) { 178 if (rtm->rtm_addrs != RTA_DST ) { 179 masks_done = 1; 180 af = sa->sa_family; 181 } 182 } else 183 #endif 184 af = sa->sa_family; 185 if (old_af != af) { 186 old_af = af; 187 pr_family(af); 188 pr_rthdr(); 189 } 190 if (rtm->rtm_addrs == RTA_DST) 191 p_sockaddr(sa, NULL, 0, WID_DST + 1 + WID_GW + 1); 192 else { 193 struct sockaddr *nm; 194 195 if ((rtm->rtm_addrs & RTA_NETMASK) == 0) 196 nm = NULL; 197 else { 198 /* skip to gateway */ 199 nm = (struct sockaddr *) 200 (ROUNDUP(sa->sa_len) + (char *)sa); 201 /* skip over gateway to netmask */ 202 nm = (struct sockaddr *) 203 (ROUNDUP(nm->sa_len) + (char *)nm); 204 } 205 206 p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST); 207 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa); 208 p_sockaddr(sa, NULL, 0, WID_GW); 209 } 210 p_flags(rtm->rtm_flags & interesting); 211 putchar('\n'); 212 } 213 214 215 /* 216 * Print address family header before a section of the routing table. 217 */ 218 static void 219 pr_family(int af) 220 { 221 char *afname; 222 223 switch (af) { 224 case AF_INET: 225 afname = "Internet"; 226 break; 227 #ifndef SMALL 228 #ifdef INET6 229 case AF_INET6: 230 afname = "Internet6"; 231 break; 232 #endif /* INET6 */ 233 case AF_NS: 234 afname = "XNS"; 235 break; 236 case AF_ISO: 237 afname = "ISO"; 238 break; 239 case AF_CCITT: 240 afname = "X.25"; 241 break; 242 #endif /* SMALL */ 243 case AF_APPLETALK: 244 afname = "AppleTalk"; 245 break; 246 default: 247 afname = NULL; 248 break; 249 } 250 if (afname) 251 printf("\n%s:\n", afname); 252 else 253 printf("\nProtocol Family %d:\n", af); 254 } 255 256 257 static void 258 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width) 259 { 260 char workbuf[128], *cplim; 261 char *cp = workbuf; 262 263 switch(sa->sa_family) { 264 265 case AF_LINK: 266 if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf), 267 NULL, 0, NI_NUMERICHOST) != 0) 268 strlcpy(workbuf, "invalid", sizeof(workbuf)); 269 cp = workbuf; 270 break; 271 272 case AF_INET: 273 cp = routename(sa, nm, flags); 274 break; 275 276 #ifndef SMALL 277 #ifdef INET6 278 case AF_INET6: 279 cp = routename(sa, nm, flags); 280 /* make sure numeric address is not truncated */ 281 if (strchr(cp, ':') != NULL && strlen(cp) > width) 282 width = strlen(cp); 283 break; 284 #endif /* INET6 */ 285 286 case AF_NS: 287 cp = ns_print((struct sockaddr_ns *)sa); 288 break; 289 #endif /* SMALL */ 290 291 default: 292 { 293 u_char *s = (u_char *)sa->sa_data, *slim; 294 295 slim = sa->sa_len + (u_char *) sa; 296 cplim = cp + sizeof(workbuf) - 6; 297 cp += snprintf(cp, cplim - cp, "(%d)", sa->sa_family); 298 while (s < slim && cp < cplim) { 299 cp += snprintf(cp, cplim - cp, " %02x", *s++); 300 if (s < slim) 301 cp += snprintf(cp, cplim - cp, "%02x", *s++); 302 } 303 cp = workbuf; 304 } 305 } 306 if (width < 0 ) 307 printf("%s ", cp); 308 else { 309 if (nflag) 310 printf("%-*s ", width, cp); 311 else 312 printf("%-*.*s ", width, width, cp); 313 } 314 } 315 316 static void 317 p_flags(int f) 318 { 319 char name[33], *flags; 320 const struct bits *p = bits; 321 322 for (flags = name; p->b_mask; p++) 323 if (p->b_mask & f) 324 *flags++ = p->b_val; 325 *flags = '\0'; 326 printf("%-6.6s ", name); 327 } 328 329