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