usr.bin/netstat/if.c

   1 /*
   2  * Copyright (c) 1983, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. 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 #if 0
  35 #ifndef lint
  36 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  37 #endif /* not lint */
  38 #endif
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include <sys/types.h>
  44 #include <sys/protosw.h>
  45 #include <sys/socket.h>
  46 #include <sys/socketvar.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/time.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_dl.h>
  53 #include <net/if_types.h>
  54 #include <net/ethernet.h>
  55 #include <net/pfvar.h>
  56 #include <net/if_pfsync.h>
  57 #include <netinet/in.h>
  58 #include <netinet/in_var.h>
  59 #include <netipx/ipx.h>
  60 #include <netipx/ipx_if.h>
  61 #include <arpa/inet.h>
  62
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <libutil.h>
  66 #include <signal.h>
  67 #include <stdint.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72
  73 #include "netstat.h"
  74
  75 #define YES     1
  76 #define NO      0
  77
  78 static void sidewaysintpr(int, u_long);
  79 static void catchalarm(int);
  80
  81 #ifdef INET6
  82 static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
  83 #endif
  84
  85 /*
  86  * Dump pfsync statistics structure.
  87  */
  88 void
  89 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
  90 {
  91         struct pfsyncstats pfsyncstat, zerostat;
  92         size_t len = sizeof(struct pfsyncstats);
  93
  94         if (live) {
  95                 if (zflag)
  96                         memset(&zerostat, 0, len);
  97                 if (sysctlbyname("net.inet.pfsync.stats", &pfsyncstat, &len,
  98                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
  99                         if (errno != ENOENT)
 100                                 warn("sysctl: net.inet.pfsync.stats");
 101                         return;
 102                 }
 103         } else
 104                 kread(off, &pfsyncstat, len);
 105
 106         printf("%s:\n", name);
 107
 108 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 109         printf(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 110 #define p2(f, m) if (pfsyncstat.f || sflag <= 1) \
 111         printf(m, (uintmax_t)pfsyncstat.f)
 112
 113         p(pfsyncs_ipackets, "\t%ju packet%s received (IPv4)\n");
 114         p(pfsyncs_ipackets6, "\t%ju packet%s received (IPv6)\n");
 115         p(pfsyncs_badif, "\t\t%ju packet%s discarded for bad interface\n");
 116         p(pfsyncs_badttl, "\t\t%ju packet%s discarded for bad ttl\n");
 117         p(pfsyncs_hdrops, "\t\t%ju packet%s shorter than header\n");
 118         p(pfsyncs_badver, "\t\t%ju packet%s discarded for bad version\n");
 119         p(pfsyncs_badauth, "\t\t%ju packet%s discarded for bad HMAC\n");
 120         p(pfsyncs_badact,"\t\t%ju packet%s discarded for bad action\n");
 121         p(pfsyncs_badlen, "\t\t%ju packet%s discarded for short packet\n");
 122         p(pfsyncs_badval, "\t\t%ju state%s discarded for bad values\n");
 123         p(pfsyncs_stale, "\t\t%ju stale state%s\n");
 124         p(pfsyncs_badstate, "\t\t%ju failed state lookup/insert%s\n");
 125         p(pfsyncs_opackets, "\t%ju packet%s sent (IPv4)\n");
 126         p(pfsyncs_opackets6, "\t%ju packet%s sent (IPv6)\n");
 127         p2(pfsyncs_onomem, "\t\t%ju send failed due to mbuf memory error\n");
 128         p2(pfsyncs_oerrors, "\t\t%ju send error\n");
 129 #undef p
 130 #undef p2
 131 }
 132
 133 /*
 134  * Display a formatted value, or a '-' in the same space.
 135  */
 136 static void
 137 show_stat(const char *fmt, int width, u_long value, short showvalue)
 138 {
 139         const char *lsep, *rsep;
 140         char newfmt[32];
 141
 142         lsep = "";
 143         if (strncmp(fmt, "LS", 2) == 0) {
 144                 lsep = " ";
 145                 fmt += 2;
 146         }
 147         rsep = " ";
 148         if (strncmp(fmt, "NRS", 3) == 0) {
 149                 rsep = "";
 150                 fmt += 3;
 151         }
 152         if (showvalue == 0) {
 153                 /* Print just dash. */
 154                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 155                 printf(newfmt, "-");
 156                 return;
 157         }
 158
 159         if (hflag) {
 160                 char buf[5];
 161
 162                 /* Format in human readable form. */
 163                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 164                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL);
 165                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 166                 printf(newfmt, buf);
 167         } else {
 168                 /* Construct the format string. */
 169                 sprintf(newfmt, "%s%%%d%s%s", lsep, width, fmt, rsep);
 170                 printf(newfmt, value);
 171         }
 172 }
 173
 174 /*
 175  * Print a description of the network interfaces.
 176  */
 177 void
 178 intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *))
 179 {
 180         struct ifnet ifnet;
 181         struct ifnethead ifnethead;
 182         union {
 183                 struct ifaddr ifa;
 184                 struct in_ifaddr in;
 185 #ifdef INET6
 186                 struct in6_ifaddr in6;
 187 #endif
 188                 struct ipx_ifaddr ipx;
 189         } ifaddr;
 190         u_long ifaddraddr;
 191         u_long ifaddrfound;
 192         u_long ifnetfound;
 193         u_long opackets;
 194         u_long ipackets;
 195         u_long obytes;
 196         u_long ibytes;
 197         u_long omcasts;
 198         u_long imcasts;
 199         u_long oerrors;
 200         u_long ierrors;
 201         u_long collisions;
 202         short timer;
 203         int drops;
 204         struct sockaddr *sa = NULL;
 205         char name[IFNAMSIZ];
 206         short network_layer;
 207         short link_layer;
 208
 209         if (ifnetaddr == 0) {
 210                 printf("ifnet: symbol not defined\n");
 211                 return;
 212         }
 213         if (interval1) {
 214                 sidewaysintpr(interval1, ifnetaddr);
 215                 return;
 216         }
 217         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead))
 218                 return;
 219         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 220         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 221                 return;
 222
 223         if (!pfunc) {
 224                 if (Wflag)
 225                         printf("%-7.7s", "Name");
 226                 else
 227                         printf("%-5.5s", "Name");
 228                 printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s",
 229                     "Mtu", "Network", "Address", "Ipkts", "Ierrs");
 230                 if (bflag)
 231                         printf(" %10.10s","Ibytes");
 232                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 233                 if (bflag)
 234                         printf(" %10.10s","Obytes");
 235                 printf(" %5s", "Coll");
 236                 if (tflag)
 237                         printf(" %s", "Time");
 238                 if (dflag)
 239                         printf(" %s", "Drop");
 240                 putchar('\n');
 241         }
 242         ifaddraddr = 0;
 243         while (ifnetaddr || ifaddraddr) {
 244                 struct sockaddr_in *sockin;
 245 #ifdef INET6
 246                 struct sockaddr_in6 *sockin6;
 247 #endif
 248                 char *cp;
 249                 int n, m;
 250
 251                 network_layer = 0;
 252                 link_layer = 0;
 253
 254                 if (ifaddraddr == 0) {
 255                         ifnetfound = ifnetaddr;
 256                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 257                                 return;
 258                         strlcpy(name, ifnet.if_xname, sizeof(name));
 259                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 260                         if (interface != 0 && (strcmp(name, interface) != 0))
 261                                 continue;
 262                         cp = index(name, '\0');
 263
 264                         if (pfunc) {
 265                                 (*pfunc)(name);
 266                                 continue;
 267                         }
 268
 269                         if ((ifnet.if_flags&IFF_UP) == 0)
 270                                 *cp++ = '*';
 271                         *cp = '\0';
 272                         ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
 273                 }
 274                 ifaddrfound = ifaddraddr;
 275
 276                 /*
 277                  * Get the interface stats.  These may get
 278                  * overriden below on a per-interface basis.
 279                  */
 280                 opackets = ifnet.if_opackets;
 281                 ipackets = ifnet.if_ipackets;
 282                 obytes = ifnet.if_obytes;
 283                 ibytes = ifnet.if_ibytes;
 284                 omcasts = ifnet.if_omcasts;
 285                 imcasts = ifnet.if_imcasts;
 286                 oerrors = ifnet.if_oerrors;
 287                 ierrors = ifnet.if_ierrors;
 288                 collisions = ifnet.if_collisions;
 289                 timer = ifnet.if_timer;
 290                 drops = ifnet.if_snd.ifq_drops;
 291
 292                 if (ifaddraddr == 0) {
 293                         if (Wflag)
 294                                 printf("%-7.7s", name);
 295                         else
 296                                 printf("%-5.5s", name);
 297                         printf(" %5lu ", ifnet.if_mtu);
 298                         printf("%-13.13s ", "none");
 299                         printf("%-17.17s ", "none");
 300                 } else {
 301                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
 302                                 ifaddraddr = 0;
 303                                 continue;
 304                         }
 305 #define CP(x) ((char *)(x))
 306                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 307                                 CP(&ifaddr);
 308                         sa = (struct sockaddr *)cp;
 309                         if (af != AF_UNSPEC && sa->sa_family != af) {
 310                                 ifaddraddr =
 311                                     (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 312                                 continue;
 313                         }
 314                         if (Wflag)
 315                                 printf("%-7.7s", name);
 316                         else
 317                                 printf("%-5.5s", name);
 318                         printf(" %5lu ", ifnet.if_mtu);
 319                         switch (sa->sa_family) {
 320                         case AF_UNSPEC:
 321                                 printf("%-13.13s ", "none");
 322                                 printf("%-15.15s ", "none");
 323                                 break;
 324                         case AF_INET:
 325                                 sockin = (struct sockaddr_in *)sa;
 326 #ifdef notdef
 327                                 /* can't use inet_makeaddr because kernel
 328                                  * keeps nets unshifted.
 329                                  */
 330                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 331                                         INADDR_ANY);
 332                                 printf("%-13.13s ", netname(in.s_addr,
 333                                     ifaddr.in.ia_subnetmask));
 334 #else
 335                                 printf("%-13.13s ",
 336                                     netname(htonl(ifaddr.in.ia_subnet),
 337                                     ifaddr.in.ia_subnetmask));
 338 #endif
 339                                 printf("%-17.17s ",
 340                                     routename(sockin->sin_addr.s_addr));
 341
 342                                 network_layer = 1;
 343                                 break;
 344 #ifdef INET6
 345                         case AF_INET6:
 346                                 sockin6 = (struct sockaddr_in6 *)sa;
 347                                 printf("%-13.13s ",
 348                                        netname6(&ifaddr.in6.ia_addr,
 349                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 350                                 printf("%-17.17s ",
 351                                     inet_ntop(AF_INET6,
 352                                         &sockin6->sin6_addr,
 353                                         ntop_buf, sizeof(ntop_buf)));
 354
 355                                 network_layer = 1;
 356                                 break;
 357 #endif /*INET6*/
 358                         case AF_IPX:
 359                                 {
 360                                 struct sockaddr_ipx *sipx =
 361                                         (struct sockaddr_ipx *)sa;
 362                                 u_long net;
 363                                 char netnum[10];
 364
 365                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 366                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 367                                 printf("ipx:%-8s  ", netnum);
 368 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 369                                 printf("%-17s ",
 370                                     ipx_phost((struct sockaddr *)sipx));
 371                                 }
 372
 373                                 network_layer = 1;
 374                                 break;
 375
 376                         case AF_APPLETALK:
 377                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 378                                 printf("%-11.11s  ",atalk_print(sa,0x0b) );
 379                                 break;
 380                         case AF_LINK:
 381                                 {
 382                                 struct sockaddr_dl *sdl =
 383                                         (struct sockaddr_dl *)sa;
 384                                 char linknum[10];
 385                                 cp = (char *)LLADDR(sdl);
 386                                 n = sdl->sdl_alen;
 387                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 388                                 m = printf("%-13.13s ", linknum);
 389                                 }
 390                                 goto hexprint;
 391                         default:
 392                                 m = printf("(%d)", sa->sa_family);
 393                                 for (cp = sa->sa_len + (char *)sa;
 394                                         --cp > sa->sa_data && (*cp == 0);) {}
 395                                 n = cp - sa->sa_data + 1;
 396                                 cp = sa->sa_data;
 397                         hexprint:
 398                                 while (--n >= 0)
 399                                         m += printf("%02x%c", *cp++ & 0xff,
 400                                                     n > 0 ? ':' : ' ');
 401                                 m = 32 - m;
 402                                 while (m-- > 0)
 403                                         putchar(' ');
 404
 405                                 link_layer = 1;
 406                                 break;
 407                         }
 408
 409                         /*
 410                          * Fixup the statistics for interfaces that
 411                          * update stats for their network addresses
 412                          */
 413                         if (network_layer) {
 414                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 415                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 416                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 417                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 418                         }
 419
 420                         ifaddraddr = (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 421                 }
 422
 423                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 424                 show_stat("lu", 5, ierrors, link_layer);
 425                 if (bflag)
 426                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 427
 428                 show_stat("lu", 8, opackets, link_layer|network_layer);
 429                 show_stat("lu", 5, oerrors, link_layer);
 430                 if (bflag)
 431                         show_stat("lu", 10, obytes, link_layer|network_layer);
 432
 433                 show_stat("NRSlu", 5, collisions, link_layer);
 434                 if (tflag)
 435                         show_stat("LSd", 4, timer, link_layer);
 436                 if (dflag)
 437                         show_stat("LSd", 4, drops, link_layer);
 438                 putchar('\n');
 439
 440                 if (aflag && ifaddrfound) {
 441                         /*
 442                          * Print family's multicast addresses
 443                          */
 444                         struct ifmultiaddr *multiaddr;
 445                         struct ifmultiaddr ifma;
 446                         union {
 447                                 struct sockaddr sa;
 448                                 struct sockaddr_in in;
 449 #ifdef INET6
 450                                 struct sockaddr_in6 in6;
 451 #endif /* INET6 */
 452                                 struct sockaddr_dl dl;
 453                         } msa;
 454                         const char *fmt;
 455
 456                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 457                                 if (kread((u_long)multiaddr, (char *)&ifma,
 458                                           sizeof ifma))
 459                                         break;
 460                                 multiaddr = &ifma;
 461                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 462                                           sizeof msa))
 463                                         break;
 464                                 if (msa.sa.sa_family != sa->sa_family)
 465                                         continue;
 466
 467                                 fmt = 0;
 468                                 switch (msa.sa.sa_family) {
 469                                 case AF_INET:
 470                                         fmt = routename(msa.in.sin_addr.s_addr);
 471                                         break;
 472 #ifdef INET6
 473                                 case AF_INET6:
 474                                         printf("%*s %-19.19s(refs: %d)\n",
 475                                                Wflag ? 27 : 25, "",
 476                                                inet_ntop(AF_INET6,
 477                                                          &msa.in6.sin6_addr,
 478                                                          ntop_buf,
 479                                                          sizeof(ntop_buf)),
 480                                                ifma.ifma_refcount);
 481                                         break;
 482 #endif /* INET6 */
 483                                 case AF_LINK:
 484                                         switch (msa.dl.sdl_type) {
 485                                         case IFT_ETHER:
 486                                         case IFT_FDDI:
 487                                                 fmt = ether_ntoa(
 488                                                         (struct ether_addr *)
 489                                                         LLADDR(&msa.dl));
 490                                                 break;
 491                                         }
 492                                         break;
 493                                 }
 494                                 if (fmt) {
 495                                         printf("%*s %-17.17s",
 496                                             Wflag ? 27 : 25, "", fmt);
 497                                         if (msa.sa.sa_family == AF_LINK) {
 498                                                 printf(" %8lu", imcasts);
 499                                                 printf("%*s",
 500                                                     bflag ? 17 : 6, "");
 501                                                 printf(" %8lu", omcasts);
 502                                         }
 503                                         putchar('\n');
 504                                 }
 505                         }
 506                 }
 507         }
 508 }
 509
 510 struct  iftot {
 511         SLIST_ENTRY(iftot) chain;
 512         char    ift_name[IFNAMSIZ];     /* interface name */
 513         u_long  ift_ip;                 /* input packets */
 514         u_long  ift_ie;                 /* input errors */
 515         u_long  ift_op;                 /* output packets */
 516         u_long  ift_oe;                 /* output errors */
 517         u_long  ift_co;                 /* collisions */
 518         u_int   ift_dr;                 /* drops */
 519         u_long  ift_ib;                 /* input bytes */
 520         u_long  ift_ob;                 /* output bytes */
 521 };
 522
 523 u_char  signalled;                      /* set if alarm goes off "early" */
 524
 525 /*
 526  * Print a running summary of interface statistics.
 527  * Repeat display every interval1 seconds, showing statistics
 528  * collected over that interval.  Assumes that interval1 is non-zero.
 529  * First line printed at top of screen is always cumulative.
 530  * XXX - should be rewritten to use ifmib(4).
 531  */
 532 static void
 533 sidewaysintpr(int interval1, u_long off)
 534 {
 535         struct ifnet ifnet;
 536         u_long firstifnet;
 537         struct ifnethead ifnethead;
 538         struct itimerval interval_it;
 539         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 540         int line;
 541         int oldmask, first;
 542         u_long interesting_off;
 543
 544         if (kread(off, (char *)&ifnethead, sizeof ifnethead))
 545                 return;
 546         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 547
 548         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 549                 printf("malloc failed\n");
 550                 exit(1);
 551         }
 552         memset(iftot, 0, sizeof(struct iftot));
 553
 554         interesting = NULL;
 555         interesting_off = 0;
 556         for (off = firstifnet, ip = iftot; off;) {
 557                 char name[IFNAMSIZ];
 558
 559                 if (kread(off, (char *)&ifnet, sizeof ifnet))
 560                         break;
 561                 strlcpy(name, ifnet.if_xname, sizeof(name));
 562                 if (interface && strcmp(name, interface) == 0) {
 563                         interesting = ip;
 564                         interesting_off = off;
 565                 }
 566                 snprintf(ip->ift_name, sizeof(ip->ift_name), "(%s)", name);;
 567                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 568                         printf("malloc failed\n");
 569                         exit(1);
 570                 }
 571                 memset(ipn, 0, sizeof(struct iftot));
 572                 SLIST_NEXT(ip, chain) = ipn;
 573                 ip = ipn;
 574                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 575         }
 576         if (interface && interesting == NULL)
 577                 errx(1, "%s: unknown interface", interface);
 578         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 579                 printf("malloc failed\n");
 580                 exit(1);
 581         }
 582         memset(total, 0, sizeof(struct iftot));
 583         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 584                 printf("malloc failed\n");
 585                 exit(1);
 586         }
 587         memset(sum, 0, sizeof(struct iftot));
 588
 589         (void)signal(SIGALRM, catchalarm);
 590         signalled = NO;
 591         interval_it.it_interval.tv_sec = interval1;
 592         interval_it.it_interval.tv_usec = 0;
 593         interval_it.it_value = interval_it.it_interval;
 594         setitimer(ITIMER_REAL, &interval_it, NULL);
 595         first = 1;
 596 banner:
 597         printf("%17s %14s %16s", "input",
 598             interesting ? interesting->ift_name : "(Total)", "output");
 599         putchar('\n');
 600         printf("%10s %5s %10s %10s %5s %10s %5s",
 601             "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
 602         if (dflag)
 603                 printf(" %5.5s", "drops");
 604         putchar('\n');
 605         fflush(stdout);
 606         line = 0;
 607 loop:
 608         if (interesting != NULL) {
 609                 ip = interesting;
 610                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet)) {
 611                         printf("???\n");
 612                         exit(1);
 613                 };
 614                 if (!first) {
 615                         show_stat("lu", 10, ifnet.if_ipackets - ip->ift_ip, 1);
 616                         show_stat("lu", 5, ifnet.if_ierrors - ip->ift_ie, 1);
 617                         show_stat("lu", 10, ifnet.if_ibytes - ip->ift_ib, 1);
 618                         show_stat("lu", 10, ifnet.if_opackets - ip->ift_op, 1);
 619                         show_stat("lu", 5, ifnet.if_oerrors - ip->ift_oe, 1);
 620                         show_stat("lu", 10, ifnet.if_obytes - ip->ift_ob, 1);
 621                         show_stat("NRSlu", 5,
 622                             ifnet.if_collisions - ip->ift_co, 1);
 623                         if (dflag)
 624                                 show_stat("LSu", 5,
 625                                     ifnet.if_snd.ifq_drops - ip->ift_dr, 1);
 626                 }
 627                 ip->ift_ip = ifnet.if_ipackets;
 628                 ip->ift_ie = ifnet.if_ierrors;
 629                 ip->ift_ib = ifnet.if_ibytes;
 630                 ip->ift_op = ifnet.if_opackets;
 631                 ip->ift_oe = ifnet.if_oerrors;
 632                 ip->ift_ob = ifnet.if_obytes;
 633                 ip->ift_co = ifnet.if_collisions;
 634                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 635         } else {
 636                 sum->ift_ip = 0;
 637                 sum->ift_ie = 0;
 638                 sum->ift_ib = 0;
 639                 sum->ift_op = 0;
 640                 sum->ift_oe = 0;
 641                 sum->ift_ob = 0;
 642                 sum->ift_co = 0;
 643                 sum->ift_dr = 0;
 644                 for (off = firstifnet, ip = iftot;
 645                      off && SLIST_NEXT(ip, chain) != NULL;
 646                      ip = SLIST_NEXT(ip, chain)) {
 647                         if (kread(off, (char *)&ifnet, sizeof ifnet)) {
 648                                 off = 0;
 649                                 continue;
 650                         }
 651                         sum->ift_ip += ifnet.if_ipackets;
 652                         sum->ift_ie += ifnet.if_ierrors;
 653                         sum->ift_ib += ifnet.if_ibytes;
 654                         sum->ift_op += ifnet.if_opackets;
 655                         sum->ift_oe += ifnet.if_oerrors;
 656                         sum->ift_ob += ifnet.if_obytes;
 657                         sum->ift_co += ifnet.if_collisions;
 658                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 659                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 660                 }
 661                 if (!first) {
 662                         show_stat("lu", 10, sum->ift_ip - total->ift_ip, 1);
 663                         show_stat("lu", 5, sum->ift_ie - total->ift_ie, 1);
 664                         show_stat("lu", 10, sum->ift_ib - total->ift_ib, 1);
 665                         show_stat("lu", 10, sum->ift_op - total->ift_op, 1);
 666                         show_stat("lu", 5, sum->ift_oe - total->ift_oe, 1);
 667                         show_stat("lu", 10, sum->ift_ob - total->ift_ob, 1);
 668                         show_stat("NRSlu", 5, sum->ift_co - total->ift_co, 1);
 669                         if (dflag)
 670                                 show_stat("LSu", 5,
 671                                     sum->ift_dr - total->ift_dr, 1);
 672                 }
 673                 *total = *sum;
 674         }
 675         if (!first)
 676                 putchar('\n');
 677         fflush(stdout);
 678         oldmask = sigblock(sigmask(SIGALRM));
 679         while (!signalled)
 680                 sigpause(0);
 681         signalled = NO;
 682         sigsetmask(oldmask);
 683         line++;
 684         first = 0;
 685         if (line == 21)
 686                 goto banner;
 687         else
 688                 goto loop;
 689         /*NOTREACHED*/
 690 }
 691
 692 /*
 693  * Set a flag to indicate that a signal from the periodic itimer has been
 694  * caught.
 695  */
 696 static void
 697 catchalarm(int signo __unused)
 698 {
 699         signalled = YES;
 700 }