network_cmds/netstat.tproj/route.c

   1 /*
   2  * Copyright (c) 2008-2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1983, 1988, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61 #include <stdint.h>
  62 #include <sys/param.h>
  63 #include <sys/socket.h>
  64 #include <sys/time.h>
  65 #include <sys/errno.h>
  66
  67 #include <net/if.h>
  68 #include <net/if_var.h>
  69 #include <net/if_dl.h>
  70 #include <net/if_types.h>
  71 #include <net/route.h>
  72 #include <net/radix.h>
  73
  74 #include <netinet/in.h>
  75
  76 #include <sys/sysctl.h>
  77
  78 #include <arpa/inet.h>
  79 #include <netdb.h>
  80 #include <stdio.h>
  81 #include <stdlib.h>
  82 #include <string.h>
  83 #include <unistd.h>
  84 #include <err.h>
  85 #include <time.h>
  86 #include "netstat.h"
  87
  88 /* alignment constraint for routing socket */
  89 #define ROUNDUP(a) \
  90        ((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t))
  91 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  92
  93 /*
  94  * Definitions for showing gateway flags.
  95  */
  96 struct bits {
  97         uint32_t        b_mask;
  98         char    b_val;
  99 } bits[] = {
 100         { RTF_UP,       'U' },
 101         { RTF_GATEWAY,  'G' },
 102         { RTF_HOST,     'H' },
 103         { RTF_REJECT,   'R' },
 104         { RTF_DYNAMIC,  'D' },
 105         { RTF_MODIFIED, 'M' },
 106         { RTF_MULTICAST,'m' },
 107         { RTF_DONE,     'd' }, /* Completed -- for routing messages only */
 108         { RTF_CLONING,  'C' },
 109         { RTF_XRESOLVE, 'X' },
 110         { RTF_LLINFO,   'L' },
 111         { RTF_STATIC,   'S' },
 112         { RTF_PROTO1,   '1' },
 113         { RTF_PROTO2,   '2' },
 114         { RTF_WASCLONED,'W' },
 115         { RTF_PRCLONING,'c' },
 116         { RTF_PROTO3,   '3' },
 117         { RTF_BLACKHOLE,'B' },
 118         { RTF_BROADCAST,'b' },
 119         { RTF_IFSCOPE,  'I' },
 120         { RTF_IFREF,    'i' },
 121         { RTF_PROXY,    'Y' },
 122         { RTF_ROUTER,   'r' },
 123 #ifdef RTF_GLOBAL
 124         { RTF_GLOBAL,   'g' },
 125 #endif /* RTF_GLOBAL */
 126         { 0 }
 127 };
 128
 129 typedef union {
 130         uint32_t dummy;         /* Helps align structure. */
 131         struct  sockaddr u_sa;
 132         u_short u_data[128];
 133 } sa_u;
 134
 135 static void np_rtentry __P((struct rt_msghdr2 *));
 136 static void p_sockaddr __P((struct sockaddr *, struct sockaddr *, int, int));
 137 static void p_flags __P((int, char *));
 138 static uint32_t forgemask __P((uint32_t));
 139 static void domask __P((char *, uint32_t, uint32_t));
 140
 141 /*
 142  * Print address family header before a section of the routing table.
 143  */
 144 void
 145 pr_family(int af)
 146 {
 147         char *afname;
 148
 149         switch (af) {
 150         case AF_INET:
 151                 afname = "Internet";
 152                 break;
 153 #ifdef INET6
 154         case AF_INET6:
 155                 afname = "Internet6";
 156                 break;
 157 #endif /*INET6*/
 158         case AF_IPX:
 159                 afname = "IPX";
 160                 break;
 161         default:
 162                 afname = NULL;
 163                 break;
 164         }
 165         if (afname)
 166                 printf("\n%s:\n", afname);
 167         else
 168                 printf("\nProtocol Family %d:\n", af);
 169 }
 170
 171 /* column widths; each followed by one space */
 172 #ifndef INET6
 173 #define WID_DST(af)     18      /* width of destination column */
 174 #define WID_GW(af)      18      /* width of gateway column */
 175 #define WID_RT_IFA(af)  18      /* width of source column */
 176 #define WID_IF(af)      7       /* width of netif column */
 177 #else
 178 #define WID_DST(af) \
 179         ((af) == AF_INET6 ? (lflag ? 39 : (nflag ? 39: 18)) : 18)
 180 #define WID_GW(af) \
 181         ((af) == AF_INET6 ? (lflag ? 31 : (nflag ? 31 : 18)) : 18)
 182 #define WID_RT_IFA(af) \
 183         ((af) == AF_INET6 ? (lflag ? 39 : (nflag ? 39 : 18)) : 18)
 184 #define WID_IF(af)      ((af) == AF_INET6 ? 8 : 7)
 185 #endif /*INET6*/
 186
 187 /*
 188  * Print header for routing table columns.
 189  */
 190 void
 191 pr_rthdr(int af)
 192 {
 193         if (lflag) {
 194                 if (lflag > 2)
 195                         printf("%-*.*s %-*.*s %-*.*s %-10.10s %6.6s %8.8s %6.6s %*.*s %6s "
 196                                 "%10s %10s %8s %8s %8s\n",
 197                                 WID_DST(af), WID_DST(af), "Destination",
 198                                 WID_GW(af), WID_GW(af), "Gateway",
 199                                 WID_RT_IFA(af), WID_RT_IFA(af), "RT_IFA",
 200                                 "Flags", "Refs", "Use", "Mtu",
 201                                 WID_IF(af), WID_IF(af), "Netif", "Expire",
 202                                 "rtt(ms)", "rttvar(ms)", "recvpipe", "sendpipe", "ssthresh");
 203                 else if (lflag > 1)
 204                         printf("%-*.*s %-*.*s %-*.*s %-10.10s %6.6s %8.8s %6.6s %*.*s %6s "
 205                                 "%10s %10s\n",
 206                                 WID_DST(af), WID_DST(af), "Destination",
 207                                 WID_GW(af), WID_GW(af), "Gateway",
 208                                 WID_RT_IFA(af), WID_RT_IFA(af), "RT_IFA",
 209                                 "Flags", "Refs", "Use", "Mtu",
 210                                 WID_IF(af), WID_IF(af), "Netif", "Expire",
 211                                 "rtt(ms)", "rttvar(ms)");
 212                 else
 213                         printf("%-*.*s %-*.*s %-*.*s %-10.10s %6.6s %8.8s %6.6s %*.*s %6s\n",
 214                                 WID_DST(af), WID_DST(af), "Destination",
 215                                 WID_GW(af), WID_GW(af), "Gateway",
 216                                 WID_RT_IFA(af), WID_RT_IFA(af), "RT_IFA",
 217                                 "Flags", "Refs", "Use", "Mtu",
 218                                 WID_IF(af), WID_IF(af), "Netif", "Expire");
 219     }  else {
 220                 printf("%-*.*s %-*.*s %-10.10s %*.*s %6s\n",
 221                         WID_DST(af), WID_DST(af), "Destination",
 222                         WID_GW(af), WID_GW(af), "Gateway",
 223                         "Flags", WID_IF(af), WID_IF(af), "Netif", "Expire");
 224         }
 225 }
 226
 227 /*
 228  * Print routing tables.
 229  */
 230 void
 231 routepr(void)
 232 {
 233         size_t extra_space;
 234         size_t needed;
 235         int mib[6];
 236         char *buf, *next, *lim;
 237         struct rt_msghdr2 *rtm;
 238         int try = 1;
 239
 240         printf("Routing tables\n");
 241
 242  again:
 243         mib[0] = CTL_NET;
 244         mib[1] = PF_ROUTE;
 245         mib[2] = 0;
 246         mib[3] = 0;
 247         mib[4] = NET_RT_DUMP2;
 248         mib[5] = 0;
 249         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
 250                 err(1, "sysctl: net.route.0.0.dump estimate");
 251         }
 252         /* allocate extra space in case the table grows */
 253         extra_space = needed / 2;
 254         if (needed <= (SIZE_MAX - extra_space)) {
 255                 needed += extra_space;
 256         }
 257         if ((buf = malloc(needed)) == 0) {
 258                 err(2, "malloc(%lu)", (unsigned long)needed);
 259         }
 260         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
 261 #define MAX_TRIES       10
 262                 if (errno == ENOMEM && try < MAX_TRIES) {
 263                         /* the buffer we provided was too small, try again */
 264                         free(buf);
 265                         try++;
 266                         goto again;
 267                 }
 268                 err(1, "sysctl: net.route.0.0.dump");
 269         }
 270         lim  = buf + needed;
 271         for (next = buf; next < lim; next += rtm->rtm_msglen) {
 272                 rtm = (struct rt_msghdr2 *)next;
 273                 np_rtentry(rtm);
 274         }
 275 }
 276
 277 static void
 278 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 279 {
 280         int i;
 281
 282         for (i = 0; i < RTAX_MAX; i++) {
 283                 if (addrs & (1 << i)) {
 284                         rti_info[i] = sa;
 285                                                 sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
 286                 } else {
 287                         rti_info[i] = NULL;
 288         }
 289 }
 290 }
 291
 292 static void
 293 np_rtentry(struct rt_msghdr2 *rtm)
 294 {
 295         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 296         struct sockaddr *rti_info[RTAX_MAX];
 297         static int old_fam;
 298         int fam = 0;
 299         u_short lastindex = 0xffff;
 300         static char ifname[IFNAMSIZ + 1];
 301         sa_u addr, mask;
 302
 303         /*
 304          * Don't print protocol-cloned routes unless -a.
 305          */
 306         if ((rtm->rtm_flags & RTF_WASCLONED) &&
 307             (rtm->rtm_parentflags & RTF_PRCLONING) &&
 308             !aflag) {
 309                         return;
 310         }
 311
 312         if (lflag > 1 && zflag != 0 && rtm->rtm_rmx.rmx_rtt == 0 && rtm->rtm_rmx.rmx_rttvar == 0)
 313                 return;
 314         fam = sa->sa_family;
 315         if (af != AF_UNSPEC && af != fam)
 316                 return;
 317         if (fam != old_fam) {
 318                 pr_family(fam);
 319                 pr_rthdr(fam);
 320                 old_fam = fam;
 321         }
 322         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 323         bzero(&addr, sizeof(addr));
 324         if ((rtm->rtm_addrs & RTA_DST))
 325                 bcopy(rti_info[RTAX_DST], &addr, rti_info[RTAX_DST]->sa_len);
 326         bzero(&mask, sizeof(mask));
 327         if ((rtm->rtm_addrs & RTA_NETMASK))
 328                 bcopy(rti_info[RTAX_NETMASK], &mask, rti_info[RTAX_NETMASK]->sa_len);
 329         p_sockaddr(&addr.u_sa, &mask.u_sa, rtm->rtm_flags,
 330             WID_DST(addr.u_sa.sa_family));
 331
 332         p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
 333             WID_GW(addr.u_sa.sa_family));
 334
 335         if (lflag && (rtm->rtm_addrs & RTA_IFA)) {
 336                 p_sockaddr(rti_info[RTAX_IFA], NULL, RTF_HOST,
 337                     WID_RT_IFA(addr.u_sa.sa_family));
 338         }
 339
 340         p_flags(rtm->rtm_flags, "%-10.10s ");
 341
 342         if (lflag) {
 343                 printf("%6u %8u ", rtm->rtm_refcnt, (unsigned int)rtm->rtm_use);
 344                 if (rtm->rtm_rmx.rmx_mtu != 0)
 345                         printf("%6u ", rtm->rtm_rmx.rmx_mtu);
 346                 else
 347                         printf("%6s ", "");
 348         }
 349
 350         if (rtm->rtm_index != lastindex) {
 351                 if_indextoname(rtm->rtm_index, ifname);
 352                 lastindex = rtm->rtm_index;
 353         }
 354         printf("%*.*s", WID_IF(addr.u_sa.sa_family),
 355                 WID_IF(addr.u_sa.sa_family), ifname);
 356
 357         if (rtm->rtm_rmx.rmx_expire) {
 358                 time_t expire_time;
 359
 360                 if ((expire_time =
 361                         rtm->rtm_rmx.rmx_expire - time((time_t *)0)) > 0)
 362                         printf(" %6d", (int)expire_time);
 363                 else
 364                         printf(" %6s", "!");
 365         } else {
 366                 printf(" %6s", "");
 367         }
 368         if (lflag > 1) {
 369                 if (rtm->rtm_rmx.rmx_rtt != 0)
 370                         printf(" %6u.%03u", rtm->rtm_rmx.rmx_rtt / 1000,
 371                                rtm->rtm_rmx.rmx_rtt % 1000);
 372                 else
 373                         printf(" %10s", "");
 374                 if (rtm->rtm_rmx.rmx_rttvar != 0)
 375                         printf(" %6u.%03u", rtm->rtm_rmx.rmx_rttvar / 1000,
 376                                rtm->rtm_rmx.rmx_rttvar % 1000);
 377                 else
 378                         printf(" %10s", "");
 379                 if (lflag > 2) {
 380                         if (rtm->rtm_rmx.rmx_recvpipe != 0)
 381                                 printf(" %8u", rtm->rtm_rmx.rmx_recvpipe);
 382                         else
 383                                 printf(" %8s", "");
 384                         if (rtm->rtm_rmx.rmx_sendpipe != 0)
 385                                 printf(" %8u", rtm->rtm_rmx.rmx_sendpipe);
 386                         else
 387                                 printf(" %8s", "");
 388                         if (rtm->rtm_rmx.rmx_ssthresh != 0)
 389                                 printf(" %8u", rtm->rtm_rmx.rmx_ssthresh);
 390                         else
 391                                 printf(" %8s", "");
 392                 }
 393         }
 394         putchar('\n');
 395 }
 396
 397 static void
 398 p_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags, int width)
 399 {
 400         char workbuf[128], *cplim;
 401         char *cp = workbuf;
 402
 403         switch(sa->sa_family) {
 404         case AF_INET: {
 405                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 406
 407                 if ((sin->sin_addr.s_addr == INADDR_ANY) &&
 408                         mask &&
 409                     (ntohl(((struct sockaddr_in *)mask)->sin_addr.s_addr) == 0L || mask->sa_len == 0))
 410                                 cp = "default" ;
 411                 else if (flags & RTF_HOST)
 412                         cp = routename(sin->sin_addr.s_addr);
 413                 else if (mask)
 414                         cp = netname(sin->sin_addr.s_addr,
 415                             ntohl(((struct sockaddr_in *)mask)->
 416                             sin_addr.s_addr));
 417                 else
 418                         cp = netname(sin->sin_addr.s_addr, 0L);
 419                 break;
 420             }
 421
 422 #ifdef INET6
 423         case AF_INET6: {
 424                 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
 425                 struct in6_addr *in6 = &sa6->sin6_addr;
 426
 427                 /*
 428                  * XXX: This is a special workaround for KAME kernels.
 429                  * sin6_scope_id field of SA should be set in the future.
 430                  */
 431                 if (IN6_IS_ADDR_LINKLOCAL(in6) ||
 432                     IN6_IS_ADDR_MC_NODELOCAL(in6) ||
 433                     IN6_IS_ADDR_MC_LINKLOCAL(in6)) {
 434                     /* XXX: override is ok? */
 435                     sa6->sin6_scope_id = (u_int32_t)ntohs(*(u_short *)&in6->s6_addr[2]);
 436                     *(u_short *)&in6->s6_addr[2] = 0;
 437                 }
 438
 439                 if (flags & RTF_HOST)
 440                     cp = routename6(sa6);
 441                 else if (mask)
 442                     cp = netname6(sa6, mask);
 443                 else
 444                     cp = netname6(sa6, NULL);
 445                 break;
 446             }
 447 #endif /*INET6*/
 448
 449         case AF_LINK: {
 450                 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
 451
 452                 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
 453                     sdl->sdl_slen == 0) {
 454                         (void) snprintf(workbuf, sizeof(workbuf), "link#%d", sdl->sdl_index);
 455                 } else {
 456                         switch (sdl->sdl_type) {
 457
 458                         case IFT_ETHER: {
 459                                 int i;
 460                                 u_char *lla = (u_char *)sdl->sdl_data +
 461                                     sdl->sdl_nlen;
 462
 463                                 cplim = "";
 464                                 for (i = 0; i < sdl->sdl_alen; i++, lla++) {
 465                                         cp += snprintf(cp, sizeof(workbuf) - (cp - workbuf), "%s%x", cplim, *lla);
 466                                         cplim = ":";
 467                                 }
 468                                 cp = workbuf;
 469                                 break;
 470                             }
 471
 472                         default:
 473                                 cp = link_ntoa(sdl);
 474                                 break;
 475                         }
 476                 }
 477                 break;
 478             }
 479
 480         default: {
 481                 u_char *s = (u_char *)sa->sa_data, *slim;
 482
 483                 slim =  sa->sa_len + (u_char *) sa;
 484                 cplim = cp + sizeof(workbuf) - 6;
 485                 cp += snprintf(cp, sizeof(workbuf) - (cp - workbuf), "(%d)", sa->sa_family);
 486                 while (s < slim && cp < cplim) {
 487                         cp += snprintf(cp, sizeof(workbuf) - (cp - workbuf), " %02x", *s++);
 488                         if (s < slim)
 489                             cp += snprintf(cp, sizeof(workbuf) - (cp - workbuf), "%02x", *s++);
 490                 }
 491                 cp = workbuf;
 492             }
 493         }
 494         if (width < 0 ) {
 495                 printf("%s ", cp);
 496         } else {
 497                 if (nflag)
 498                         printf("%-*s ", width, cp);
 499                 else
 500                         printf("%-*.*s ", width, width, cp);
 501         }
 502 }
 503
 504 static void
 505 p_flags(int f, char *format)
 506 {
 507         char name[33], *flags;
 508         struct bits *p = bits;
 509
 510         for (flags = name; p->b_mask; p++)
 511                 if (p->b_mask & f)
 512                         *flags++ = p->b_val;
 513         *flags = '\0';
 514         printf(format, name);
 515 }
 516
 517 char *
 518 routename(uint32_t in)
 519 {
 520         char *cp;
 521         static char line[MAXHOSTNAMELEN];
 522         struct hostent *hp;
 523
 524         cp = 0;
 525         if (!nflag) {
 526                 hp = gethostbyaddr((char *)&in, sizeof (struct in_addr),
 527                         AF_INET);
 528                 if (hp) {
 529                         cp = hp->h_name;
 530                          //### trimdomain(cp, strlen(cp));
 531                 }
 532         }
 533         if (cp) {
 534                 strlcpy(line, cp, sizeof(line));
 535         } else {
 536 #define C(x)    ((x) & 0xff)
 537                 in = ntohl(in);
 538                 snprintf(line, sizeof(line), "%u.%u.%u.%u",
 539                     C(in >> 24), C(in >> 16), C(in >> 8), C(in));
 540         }
 541         return (line);
 542 }
 543
 544 static uint32_t
 545 forgemask(uint32_t a)
 546 {
 547         uint32_t m;
 548
 549         if (IN_CLASSA(a))
 550                 m = IN_CLASSA_NET;
 551         else if (IN_CLASSB(a))
 552                 m = IN_CLASSB_NET;
 553         else
 554                 m = IN_CLASSC_NET;
 555         return (m);
 556 }
 557
 558 static void
 559 domask(char *dst, uint32_t addr, uint32_t mask)
 560 {
 561         int b, i;
 562
 563         if (!mask || (forgemask(addr) == mask)) {
 564                 *dst = '\0';
 565                 return;
 566         }
 567         i = 0;
 568         for (b = 0; b < 32; b++)
 569                 if (mask & (1 << b)) {
 570                         int bb;
 571
 572                         i = b;
 573                         for (bb = b+1; bb < 32; bb++)
 574                                 if (!(mask & (1 << bb))) {
 575                                         i = -1; /* noncontig */
 576                                         break;
 577                                 }
 578                         break;
 579                 }
 580         if (i == -1)
 581                 snprintf(dst, sizeof(dst), "&0x%x", mask);
 582         else
 583                 snprintf(dst, sizeof(dst), "/%d", 32-i);
 584 }
 585
 586 /*
 587  * Return the name of the network whose address is given.
 588  * The address is assumed to be that of a net or subnet, not a host.
 589  */
 590 char *
 591 netname(uint32_t in, uint32_t mask)
 592 {
 593         char *cp = 0;
 594         static char line[MAXHOSTNAMELEN];
 595         struct netent *np = 0;
 596         uint32_t net, omask, dmask;
 597         uint32_t i;
 598
 599         i = ntohl(in);
 600         dmask = forgemask(i);
 601         omask = mask;
 602         if (!nflag && i) {
 603                 net = i & dmask;
 604                 if (!(np = getnetbyaddr(i, AF_INET)) && net != i)
 605                         np = getnetbyaddr(net, AF_INET);
 606                 if (np) {
 607                         cp = np->n_name;
 608                          //### trimdomain(cp, strlen(cp));
 609                 }
 610         }
 611         if (cp)
 612                 strlcpy(line, cp, sizeof(line));
 613         else {
 614                 switch (dmask) {
 615                 case IN_CLASSA_NET:
 616                         if ((i & IN_CLASSA_HOST) == 0) {
 617                                 snprintf(line, sizeof(line), "%u", C(i >> 24));
 618                                 break;
 619                         }
 620                         /* FALLTHROUGH */
 621                 case IN_CLASSB_NET:
 622                         if ((i & IN_CLASSB_HOST) == 0) {
 623                                 snprintf(line, sizeof(line), "%u.%u",
 624                                         C(i >> 24), C(i >> 16));
 625                                 break;
 626                         }
 627                         /* FALLTHROUGH */
 628                 case IN_CLASSC_NET:
 629                         if ((i & IN_CLASSC_HOST) == 0) {
 630                                 snprintf(line, sizeof(line), "%u.%u.%u",
 631                                         C(i >> 24), C(i >> 16), C(i >> 8));
 632                                 break;
 633                         }
 634                         /* FALLTHROUGH */
 635                 default:
 636                         snprintf(line, sizeof(line), "%u.%u.%u.%u",
 637                                 C(i >> 24), C(i >> 16), C(i >> 8), C(i));
 638                         break;
 639                 }
 640         }
 641         domask(line+strlen(line), i, omask);
 642         return (line);
 643 }
 644
 645 #ifdef INET6
 646 char *
 647 netname6(struct sockaddr_in6 *sa6, struct sockaddr *sam)
 648 {
 649         static char line[MAXHOSTNAMELEN];
 650         u_char *lim;
 651         int masklen, illegal = 0, flag = NI_WITHSCOPEID;
 652         struct in6_addr *mask = sam ? &((struct sockaddr_in6 *)sam)->sin6_addr : 0;
 653
 654         if (sam && sam->sa_len == 0) {
 655                 masklen = 0;
 656         } else if (mask) {
 657                 u_char *p = (u_char *)mask;
 658                 for (masklen = 0, lim = p + 16; p < lim; p++) {
 659                         switch (*p) {
 660                          case 0xff:
 661                                  masklen += 8;
 662                                  break;
 663                          case 0xfe:
 664                                  masklen += 7;
 665                                  break;
 666                          case 0xfc:
 667                                  masklen += 6;
 668                                  break;
 669                          case 0xf8:
 670                                  masklen += 5;
 671                                  break;
 672                          case 0xf0:
 673                                  masklen += 4;
 674                                  break;
 675                          case 0xe0:
 676                                  masklen += 3;
 677                                  break;
 678                          case 0xc0:
 679                                  masklen += 2;
 680                                  break;
 681                          case 0x80:
 682                                  masklen += 1;
 683                                  break;
 684                          case 0x00:
 685                                  break;
 686                          default:
 687                                  illegal ++;
 688                                  break;
 689                         }
 690                 }
 691                 if (illegal)
 692                         fprintf(stderr, "illegal prefixlen\n");
 693         } else {
 694                 masklen = 128;
 695         }
 696         if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr))
 697                 return("default");
 698
 699         if (nflag)
 700                 flag |= NI_NUMERICHOST;
 701         getnameinfo((struct sockaddr *)sa6, sa6->sin6_len, line, sizeof(line),
 702                     NULL, 0, flag);
 703
 704         if (nflag)
 705                 snprintf(&line[strlen(line)], sizeof(line) - strlen(line), "/%d", masklen);
 706
 707         return line;
 708 }
 709
 710 char *
 711 routename6(struct sockaddr_in6 *sa6)
 712 {
 713         static char line[MAXHOSTNAMELEN];
 714         int flag = NI_WITHSCOPEID;
 715         /* use local variable for safety */
 716         struct sockaddr_in6 sa6_local = {sizeof(sa6_local), AF_INET6, };
 717
 718         sa6_local.sin6_addr = sa6->sin6_addr;
 719         sa6_local.sin6_scope_id = sa6->sin6_scope_id;
 720
 721         if (nflag)
 722                 flag |= NI_NUMERICHOST;
 723
 724         getnameinfo((struct sockaddr *)&sa6_local, sa6_local.sin6_len,
 725                     line, sizeof(line), NULL, 0, flag);
 726
 727         return line;
 728 }
 729 #endif /*INET6*/
 730
 731 /*
 732  * Print routing statistics
 733  */
 734 void
 735 rt_stats(void)
 736 {
 737         struct rtstat rtstat;
 738         int rttrash;
 739         int mib[6];
 740         size_t len;
 741
 742         mib[0] = CTL_NET;
 743         mib[1] = AF_ROUTE;
 744         mib[2] = 0;
 745         mib[3] = 0;
 746         mib[4] = NET_RT_STAT;
 747         mib[5] = 0;
 748         len = sizeof(struct rtstat);
 749         if (sysctl(mib, 6, &rtstat, &len, 0, 0) == -1)
 750                 return;
 751
 752         mib[0] = CTL_NET;
 753         mib[1] = AF_ROUTE;
 754         mib[2] = 0;
 755         mib[3] = 0;
 756         mib[4] = NET_RT_TRASH;
 757         mib[5] = 0;
 758         len = sizeof(rttrash);
 759         if (sysctl(mib, 6, &rttrash, &len, 0, 0) == -1)
 760                 return;
 761
 762         printf("routing:\n");
 763
 764 #define p(f, m) if (rtstat.f || sflag <= 1) \
 765         printf(m, rtstat.f, plural(rtstat.f))
 766
 767         p(rts_badredirect, "\t%u bad routing redirect%s\n");
 768         p(rts_dynamic, "\t%u dynamically created route%s\n");
 769         p(rts_newgateway, "\t%u new gateway%s due to redirects\n");
 770         p(rts_unreach, "\t%u destination%s found unreachable\n");
 771         p(rts_wildcard, "\t%u use%s of a wildcard route\n");
 772         p(rts_badrtgwroute, "\t%u lookup%s returned indirect "
 773             "routes pointing to indirect gateway route\n");
 774 #undef p
 775
 776         if (rttrash || sflag <= 1)
 777                 printf("\t%u route%s not in table but not freed\n",
 778                     rttrash, plural(rttrash));
 779 }
 780
 781 void
 782 upHex(char *p0)
 783 {
 784         char *p = p0;
 785
 786         for (; *p; p++)
 787                 switch (*p) {
 788
 789                 case 'a':
 790                 case 'b':
 791                 case 'c':
 792                 case 'd':
 793                 case 'e':
 794                 case 'f':
 795                         *p += ('A' - 'a');
 796                         break;
 797                 }
 798 }