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 #ifdef INET6
  67 #include <netdb.h>
  68 #endif
  69 #include <signal.h>
  70 #include <stdint.h>
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #include <unistd.h>
  75
  76 #include "netstat.h"
  77
  78 #define YES     1
  79 #define NO      0
  80
  81 static void sidewaysintpr(int, u_long);
  82 static void catchalarm(int);
  83
  84 #ifdef INET6
  85 static char addr_buf[NI_MAXHOST];               /* for getnameinfo() */
  86 #endif
  87
  88 /*
  89  * Dump pfsync statistics structure.
  90  */
  91 void
  92 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
  93 {
  94         struct pfsyncstats pfsyncstat, zerostat;
  95         size_t len = sizeof(struct pfsyncstats);
  96
  97         if (live) {
  98                 if (zflag)
  99                         memset(&zerostat, 0, len);
 100                 if (sysctlbyname("net.inet.pfsync.stats", &pfsyncstat, &len,
 101                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 102                         if (errno != ENOENT)
 103                                 warn("sysctl: net.inet.pfsync.stats");
 104                         return;
 105                 }
 106         } else
 107                 kread(off, &pfsyncstat, len);
 108
 109         printf("%s:\n", name);
 110
 111 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 112         printf(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 113 #define p2(f, m) if (pfsyncstat.f || sflag <= 1) \
 114         printf(m, (uintmax_t)pfsyncstat.f)
 115
 116         p(pfsyncs_ipackets, "\t%ju packet%s received (IPv4)\n");
 117         p(pfsyncs_ipackets6, "\t%ju packet%s received (IPv6)\n");
 118         p(pfsyncs_badif, "\t\t%ju packet%s discarded for bad interface\n");
 119         p(pfsyncs_badttl, "\t\t%ju packet%s discarded for bad ttl\n");
 120         p(pfsyncs_hdrops, "\t\t%ju packet%s shorter than header\n");
 121         p(pfsyncs_badver, "\t\t%ju packet%s discarded for bad version\n");
 122         p(pfsyncs_badauth, "\t\t%ju packet%s discarded for bad HMAC\n");
 123         p(pfsyncs_badact,"\t\t%ju packet%s discarded for bad action\n");
 124         p(pfsyncs_badlen, "\t\t%ju packet%s discarded for short packet\n");
 125         p(pfsyncs_badval, "\t\t%ju state%s discarded for bad values\n");
 126         p(pfsyncs_stale, "\t\t%ju stale state%s\n");
 127         p(pfsyncs_badstate, "\t\t%ju failed state lookup/insert%s\n");
 128         p(pfsyncs_opackets, "\t%ju packet%s sent (IPv4)\n");
 129         p(pfsyncs_opackets6, "\t%ju packet%s sent (IPv6)\n");
 130         p2(pfsyncs_onomem, "\t\t%ju send failed due to mbuf memory error\n");
 131         p2(pfsyncs_oerrors, "\t\t%ju send error\n");
 132 #undef p
 133 #undef p2
 134 }
 135
 136 /*
 137  * Display a formatted value, or a '-' in the same space.
 138  */
 139 static void
 140 show_stat(const char *fmt, int width, u_long value, short showvalue)
 141 {
 142         const char *lsep, *rsep;
 143         char newfmt[32];
 144
 145         lsep = "";
 146         if (strncmp(fmt, "LS", 2) == 0) {
 147                 lsep = " ";
 148                 fmt += 2;
 149         }
 150         rsep = " ";
 151         if (strncmp(fmt, "NRS", 3) == 0) {
 152                 rsep = "";
 153                 fmt += 3;
 154         }
 155         if (showvalue == 0) {
 156                 /* Print just dash. */
 157                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 158                 printf(newfmt, "-");
 159                 return;
 160         }
 161
 162         if (hflag) {
 163                 char buf[5];
 164
 165                 /* Format in human readable form. */
 166                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 167                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL);
 168                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 169                 printf(newfmt, buf);
 170         } else {
 171                 /* Construct the format string. */
 172                 sprintf(newfmt, "%s%%%d%s%s", lsep, width, fmt, rsep);
 173                 printf(newfmt, value);
 174         }
 175 }
 176
 177 /*
 178  * Print a description of the network interfaces.
 179  */
 180 void
 181 intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *))
 182 {
 183         struct ifnet ifnet;
 184         struct ifnethead ifnethead;
 185         union {
 186                 struct ifaddr ifa;
 187                 struct in_ifaddr in;
 188 #ifdef INET6
 189                 struct in6_ifaddr in6;
 190 #endif
 191                 struct ipx_ifaddr ipx;
 192         } ifaddr;
 193         u_long ifaddraddr;
 194         u_long ifaddrfound;
 195         u_long opackets;
 196         u_long ipackets;
 197         u_long obytes;
 198         u_long ibytes;
 199         u_long omcasts;
 200         u_long imcasts;
 201         u_long oerrors;
 202         u_long ierrors;
 203         u_long idrops;
 204         u_long collisions;
 205         short timer;
 206         int drops;
 207         struct sockaddr *sa = NULL;
 208         char name[IFNAMSIZ];
 209         short network_layer;
 210         short link_layer;
 211
 212         if (ifnetaddr == 0) {
 213                 printf("ifnet: symbol not defined\n");
 214                 return;
 215         }
 216         if (interval1) {
 217                 sidewaysintpr(interval1, ifnetaddr);
 218                 return;
 219         }
 220         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead) != 0)
 221                 return;
 222         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 223         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
 224                 return;
 225
 226         if (!pfunc) {
 227                 if (Wflag)
 228                         printf("%-7.7s", "Name");
 229                 else
 230                         printf("%-5.5s", "Name");
 231                 printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s %5.5s",
 232                     "Mtu", "Network", "Address", "Ipkts", "Ierrs", "Idrop");
 233                 if (bflag)
 234                         printf(" %10.10s","Ibytes");
 235                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 236                 if (bflag)
 237                         printf(" %10.10s","Obytes");
 238                 printf(" %5s", "Coll");
 239                 if (tflag)
 240                         printf(" %s", "Time");
 241                 if (dflag)
 242                         printf(" %s", "Drop");
 243                 putchar('\n');
 244         }
 245         ifaddraddr = 0;
 246         while (ifnetaddr || ifaddraddr) {
 247                 struct sockaddr_in *sockin;
 248 #ifdef INET6
 249                 struct sockaddr_in6 *sockin6;
 250 #endif
 251                 char *cp;
 252                 int n, m;
 253
 254                 network_layer = 0;
 255                 link_layer = 0;
 256
 257                 if (ifaddraddr == 0) {
 258                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
 259                                 return;
 260                         strlcpy(name, ifnet.if_xname, sizeof(name));
 261                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 262                         if (interface != 0 && strcmp(name, interface) != 0)
 263                                 continue;
 264                         cp = index(name, '\0');
 265
 266                         if (pfunc) {
 267                                 (*pfunc)(name);
 268                                 continue;
 269                         }
 270
 271                         if ((ifnet.if_flags&IFF_UP) == 0)
 272                                 *cp++ = '*';
 273                         *cp = '\0';
 274                         ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
 275                 }
 276                 ifaddrfound = ifaddraddr;
 277
 278                 /*
 279                  * Get the interface stats.  These may get
 280                  * overriden below on a per-interface basis.
 281                  */
 282                 opackets = ifnet.if_opackets;
 283                 ipackets = ifnet.if_ipackets;
 284                 obytes = ifnet.if_obytes;
 285                 ibytes = ifnet.if_ibytes;
 286                 omcasts = ifnet.if_omcasts;
 287                 imcasts = ifnet.if_imcasts;
 288                 oerrors = ifnet.if_oerrors;
 289                 ierrors = ifnet.if_ierrors;
 290                 idrops = ifnet.if_iqdrops;
 291                 collisions = ifnet.if_collisions;
 292                 timer = ifnet.if_timer;
 293                 drops = ifnet.if_snd.ifq_drops;
 294
 295                 if (ifaddraddr == 0) {
 296                         if (Wflag)
 297                                 printf("%-7.7s", name);
 298                         else
 299                                 printf("%-5.5s", name);
 300                         printf(" %5lu ", ifnet.if_mtu);
 301                         printf("%-13.13s ", "none");
 302                         printf("%-17.17s ", "none");
 303                 } else {
 304                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)
 305                             != 0) {
 306                                 ifaddraddr = 0;
 307                                 continue;
 308                         }
 309 #define CP(x) ((char *)(x))
 310                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 311                                 CP(&ifaddr);
 312                         sa = (struct sockaddr *)cp;
 313                         if (af != AF_UNSPEC && sa->sa_family != af) {
 314                                 ifaddraddr =
 315                                     (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 316                                 continue;
 317                         }
 318                         if (Wflag)
 319                                 printf("%-7.7s", name);
 320                         else
 321                                 printf("%-5.5s", name);
 322                         printf(" %5lu ", ifnet.if_mtu);
 323                         switch (sa->sa_family) {
 324                         case AF_UNSPEC:
 325                                 printf("%-13.13s ", "none");
 326                                 printf("%-15.15s ", "none");
 327                                 break;
 328                         case AF_INET:
 329                                 sockin = (struct sockaddr_in *)sa;
 330 #ifdef notdef
 331                                 /* can't use inet_makeaddr because kernel
 332                                  * keeps nets unshifted.
 333                                  */
 334                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 335                                         INADDR_ANY);
 336                                 printf("%-13.13s ", netname(in.s_addr,
 337                                     ifaddr.in.ia_subnetmask));
 338 #else
 339                                 printf("%-13.13s ",
 340                                     netname(htonl(ifaddr.in.ia_subnet),
 341                                     ifaddr.in.ia_subnetmask));
 342 #endif
 343                                 printf("%-17.17s ",
 344                                     routename(sockin->sin_addr.s_addr));
 345
 346                                 network_layer = 1;
 347                                 break;
 348 #ifdef INET6
 349                         case AF_INET6:
 350                                 sockin6 = (struct sockaddr_in6 *)sa;
 351                                 in6_fillscopeid(&ifaddr.in6.ia_addr);
 352                                 printf("%-13.13s ",
 353                                        netname6(&ifaddr.in6.ia_addr,
 354                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 355                                 in6_fillscopeid(sockin6);
 356                                 getnameinfo(sa, sa->sa_len, addr_buf,
 357                                     sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 358                                 printf("%-17.17s ", addr_buf);
 359
 360                                 network_layer = 1;
 361                                 break;
 362 #endif /*INET6*/
 363                         case AF_IPX:
 364                                 {
 365                                 struct sockaddr_ipx *sipx =
 366                                         (struct sockaddr_ipx *)sa;
 367                                 u_long net;
 368                                 char netnum[10];
 369
 370                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 371                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 372                                 printf("ipx:%-8s  ", netnum);
 373 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 374                                 printf("%-17s ",
 375                                     ipx_phost((struct sockaddr *)sipx));
 376                                 }
 377
 378                                 network_layer = 1;
 379                                 break;
 380
 381                         case AF_APPLETALK:
 382                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 383                                 printf("%-11.11s  ",atalk_print(sa,0x0b) );
 384                                 break;
 385                         case AF_LINK:
 386                                 {
 387                                 struct sockaddr_dl *sdl =
 388                                         (struct sockaddr_dl *)sa;
 389                                 char linknum[10];
 390                                 cp = (char *)LLADDR(sdl);
 391                                 n = sdl->sdl_alen;
 392                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 393                                 m = printf("%-13.13s ", linknum);
 394                                 }
 395                                 goto hexprint;
 396                         default:
 397                                 m = printf("(%d)", sa->sa_family);
 398                                 for (cp = sa->sa_len + (char *)sa;
 399                                         --cp > sa->sa_data && (*cp == 0);) {}
 400                                 n = cp - sa->sa_data + 1;
 401                                 cp = sa->sa_data;
 402                         hexprint:
 403                                 while ((--n >= 0) && (m < 30))
 404                                         m += printf("%02x%c", *cp++ & 0xff,
 405                                                     n > 0 ? ':' : ' ');
 406                                 m = 32 - m;
 407                                 while (m-- > 0)
 408                                         putchar(' ');
 409
 410                                 link_layer = 1;
 411                                 break;
 412                         }
 413
 414                         /*
 415                          * Fixup the statistics for interfaces that
 416                          * update stats for their network addresses
 417                          */
 418                         if (network_layer) {
 419                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 420                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 421                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 422                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 423                         }
 424
 425                         ifaddraddr = (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 426                 }
 427
 428                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 429                 show_stat("lu", 5, ierrors, link_layer);
 430                 show_stat("lu", 5, idrops, link_layer);
 431                 if (bflag)
 432                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 433
 434                 show_stat("lu", 8, opackets, link_layer|network_layer);
 435                 show_stat("lu", 5, oerrors, link_layer);
 436                 if (bflag)
 437                         show_stat("lu", 10, obytes, link_layer|network_layer);
 438
 439                 show_stat("NRSlu", 5, collisions, link_layer);
 440                 if (tflag)
 441                         show_stat("LSd", 4, timer, link_layer);
 442                 if (dflag)
 443                         show_stat("LSd", 4, drops, link_layer);
 444                 putchar('\n');
 445
 446                 if (aflag && ifaddrfound) {
 447                         /*
 448                          * Print family's multicast addresses
 449                          */
 450                         struct ifmultiaddr *multiaddr;
 451                         struct ifmultiaddr ifma;
 452                         union {
 453                                 struct sockaddr sa;
 454                                 struct sockaddr_in in;
 455 #ifdef INET6
 456                                 struct sockaddr_in6 in6;
 457 #endif /* INET6 */
 458                                 struct sockaddr_dl dl;
 459                         } msa;
 460                         const char *fmt;
 461
 462                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 463                                 if (kread((u_long)multiaddr, (char *)&ifma,
 464                                           sizeof ifma) != 0)
 465                                         break;
 466                                 multiaddr = &ifma;
 467                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 468                                           sizeof msa) != 0)
 469                                         break;
 470                                 if (msa.sa.sa_family != sa->sa_family)
 471                                         continue;
 472
 473                                 fmt = 0;
 474                                 switch (msa.sa.sa_family) {
 475                                 case AF_INET:
 476                                         fmt = routename(msa.in.sin_addr.s_addr);
 477                                         break;
 478 #ifdef INET6
 479                                 case AF_INET6:
 480                                         in6_fillscopeid(&msa.in6);
 481                                         getnameinfo(&msa.sa, msa.sa.sa_len,
 482                                             addr_buf, sizeof(addr_buf), 0, 0,
 483                                             NI_NUMERICHOST);
 484                                         printf("%*s %-19.19s(refs: %d)\n",
 485                                                Wflag ? 27 : 25, "",
 486                                                addr_buf, ifma.ifma_refcount);
 487                                         break;
 488 #endif /* INET6 */
 489                                 case AF_LINK:
 490                                         switch (msa.dl.sdl_type) {
 491                                         case IFT_ETHER:
 492                                         case IFT_FDDI:
 493                                                 fmt = ether_ntoa(
 494                                                         (struct ether_addr *)
 495                                                         LLADDR(&msa.dl));
 496                                                 break;
 497                                         }
 498                                         break;
 499                                 }
 500                                 if (fmt) {
 501                                         printf("%*s %-17.17s",
 502                                             Wflag ? 27 : 25, "", fmt);
 503                                         if (msa.sa.sa_family == AF_LINK) {
 504                                                 printf(" %8lu", imcasts);
 505                                                 printf("%*s",
 506                                                     bflag ? 17 : 6, "");
 507                                                 printf(" %8lu", omcasts);
 508                                         }
 509                                         putchar('\n');
 510                                 }
 511                         }
 512                 }
 513         }
 514 }
 515
 516 struct  iftot {
 517         SLIST_ENTRY(iftot) chain;
 518         char    ift_name[IFNAMSIZ];     /* interface name */
 519         u_long  ift_ip;                 /* input packets */
 520         u_long  ift_ie;                 /* input errors */
 521         u_long  ift_id;                 /* input drops */
 522         u_long  ift_op;                 /* output packets */
 523         u_long  ift_oe;                 /* output errors */
 524         u_long  ift_co;                 /* collisions */
 525         u_int   ift_dr;                 /* drops */
 526         u_long  ift_ib;                 /* input bytes */
 527         u_long  ift_ob;                 /* output bytes */
 528 };
 529
 530 u_char  signalled;                      /* set if alarm goes off "early" */
 531
 532 /*
 533  * Print a running summary of interface statistics.
 534  * Repeat display every interval1 seconds, showing statistics
 535  * collected over that interval.  Assumes that interval1 is non-zero.
 536  * First line printed at top of screen is always cumulative.
 537  * XXX - should be rewritten to use ifmib(4).
 538  */
 539 static void
 540 sidewaysintpr(int interval1, u_long off)
 541 {
 542         struct ifnet ifnet;
 543         u_long firstifnet;
 544         struct ifnethead ifnethead;
 545         struct itimerval interval_it;
 546         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 547         int line;
 548         int oldmask, first;
 549         u_long interesting_off;
 550
 551         if (kread(off, (char *)&ifnethead, sizeof ifnethead) != 0)
 552                 return;
 553         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 554
 555         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 556                 printf("malloc failed\n");
 557                 exit(1);
 558         }
 559         memset(iftot, 0, sizeof(struct iftot));
 560
 561         interesting = NULL;
 562         interesting_off = 0;
 563         for (off = firstifnet, ip = iftot; off;) {
 564                 char name[IFNAMSIZ];
 565
 566                 if (kread(off, (char *)&ifnet, sizeof ifnet) != 0)
 567                         break;
 568                 strlcpy(name, ifnet.if_xname, sizeof(name));
 569                 if (interface && strcmp(name, interface) == 0) {
 570                         interesting = ip;
 571                         interesting_off = off;
 572                 }
 573                 snprintf(ip->ift_name, sizeof(ip->ift_name), "(%s)", name);;
 574                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 575                         printf("malloc failed\n");
 576                         exit(1);
 577                 }
 578                 memset(ipn, 0, sizeof(struct iftot));
 579                 SLIST_NEXT(ip, chain) = ipn;
 580                 ip = ipn;
 581                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 582         }
 583         if (interface && interesting == NULL)
 584                 errx(1, "%s: unknown interface", interface);
 585         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 586                 printf("malloc failed\n");
 587                 exit(1);
 588         }
 589         memset(total, 0, sizeof(struct iftot));
 590         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 591                 printf("malloc failed\n");
 592                 exit(1);
 593         }
 594         memset(sum, 0, sizeof(struct iftot));
 595
 596         (void)signal(SIGALRM, catchalarm);
 597         signalled = NO;
 598         interval_it.it_interval.tv_sec = interval1;
 599         interval_it.it_interval.tv_usec = 0;
 600         interval_it.it_value = interval_it.it_interval;
 601         setitimer(ITIMER_REAL, &interval_it, NULL);
 602         first = 1;
 603 banner:
 604         printf("%17s %14s %16s", "input",
 605             interesting ? interesting->ift_name : "(Total)", "output");
 606         putchar('\n');
 607         printf("%10s %5s %5s %10s %10s %5s %10s %5s",
 608             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 609             "colls");
 610         if (dflag)
 611                 printf(" %5.5s", "drops");
 612         putchar('\n');
 613         fflush(stdout);
 614         line = 0;
 615 loop:
 616         if (interesting != NULL) {
 617                 ip = interesting;
 618                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet) != 0) {
 619                         printf("???\n");
 620                         exit(1);
 621                 };
 622                 if (!first) {
 623                         show_stat("lu", 10, ifnet.if_ipackets - ip->ift_ip, 1);
 624                         show_stat("lu", 5, ifnet.if_ierrors - ip->ift_ie, 1);
 625                         show_stat("lu", 5, ifnet.if_iqdrops - ip->ift_id, 1);
 626                         show_stat("lu", 10, ifnet.if_ibytes - ip->ift_ib, 1);
 627                         show_stat("lu", 10, ifnet.if_opackets - ip->ift_op, 1);
 628                         show_stat("lu", 5, ifnet.if_oerrors - ip->ift_oe, 1);
 629                         show_stat("lu", 10, ifnet.if_obytes - ip->ift_ob, 1);
 630                         show_stat("NRSlu", 5,
 631                             ifnet.if_collisions - ip->ift_co, 1);
 632                         if (dflag)
 633                                 show_stat("LSu", 5,
 634                                     ifnet.if_snd.ifq_drops - ip->ift_dr, 1);
 635                 }
 636                 ip->ift_ip = ifnet.if_ipackets;
 637                 ip->ift_ie = ifnet.if_ierrors;
 638                 ip->ift_id = ifnet.if_iqdrops;
 639                 ip->ift_ib = ifnet.if_ibytes;
 640                 ip->ift_op = ifnet.if_opackets;
 641                 ip->ift_oe = ifnet.if_oerrors;
 642                 ip->ift_ob = ifnet.if_obytes;
 643                 ip->ift_co = ifnet.if_collisions;
 644                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 645         } else {
 646                 sum->ift_ip = 0;
 647                 sum->ift_ie = 0;
 648                 sum->ift_id = 0;
 649                 sum->ift_ib = 0;
 650                 sum->ift_op = 0;
 651                 sum->ift_oe = 0;
 652                 sum->ift_ob = 0;
 653                 sum->ift_co = 0;
 654                 sum->ift_dr = 0;
 655                 for (off = firstifnet, ip = iftot;
 656                      off && SLIST_NEXT(ip, chain) != NULL;
 657                      ip = SLIST_NEXT(ip, chain)) {
 658                         if (kread(off, (char *)&ifnet, sizeof ifnet) != 0) {
 659                                 off = 0;
 660                                 continue;
 661                         }
 662                         sum->ift_ip += ifnet.if_ipackets;
 663                         sum->ift_ie += ifnet.if_ierrors;
 664                         sum->ift_id += ifnet.if_iqdrops;
 665                         sum->ift_ib += ifnet.if_ibytes;
 666                         sum->ift_op += ifnet.if_opackets;
 667                         sum->ift_oe += ifnet.if_oerrors;
 668                         sum->ift_ob += ifnet.if_obytes;
 669                         sum->ift_co += ifnet.if_collisions;
 670                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 671                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 672                 }
 673                 if (!first) {
 674                         show_stat("lu", 10, sum->ift_ip - total->ift_ip, 1);
 675                         show_stat("lu", 5, sum->ift_ie - total->ift_ie, 1);
 676                         show_stat("lu", 5, sum->ift_id - total->ift_id, 1);
 677                         show_stat("lu", 10, sum->ift_ib - total->ift_ib, 1);
 678                         show_stat("lu", 10, sum->ift_op - total->ift_op, 1);
 679                         show_stat("lu", 5, sum->ift_oe - total->ift_oe, 1);
 680                         show_stat("lu", 10, sum->ift_ob - total->ift_ob, 1);
 681                         show_stat("NRSlu", 5, sum->ift_co - total->ift_co, 1);
 682                         if (dflag)
 683                                 show_stat("LSu", 5,
 684                                     sum->ift_dr - total->ift_dr, 1);
 685                 }
 686                 *total = *sum;
 687         }
 688         if (!first)
 689                 putchar('\n');
 690         fflush(stdout);
 691         if ((noutputs != 0) && (--noutputs == 0))
 692                 exit(0);
 693         oldmask = sigblock(sigmask(SIGALRM));
 694         while (!signalled)
 695                 sigpause(0);
 696         signalled = NO;
 697         sigsetmask(oldmask);
 698         line++;
 699         first = 0;
 700         if (line == 21)
 701                 goto banner;
 702         else
 703                 goto loop;
 704         /*NOTREACHED*/
 705 }
 706
 707 /*
 708  * Set a flag to indicate that a signal from the periodic itimer has been
 709  * caught.
 710  */
 711 static void
 712 catchalarm(int signo __unused)
 713 {
 714         signalled = YES;
 715 }