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 ifnetfound;
 196         u_long opackets;
 197         u_long ipackets;
 198         u_long obytes;
 199         u_long ibytes;
 200         u_long omcasts;
 201         u_long imcasts;
 202         u_long oerrors;
 203         u_long ierrors;
 204         u_long idrops;
 205         u_long collisions;
 206         short timer;
 207         int drops;
 208         struct sockaddr *sa = NULL;
 209         char name[IFNAMSIZ];
 210         short network_layer;
 211         short link_layer;
 212
 213         if (ifnetaddr == 0) {
 214                 printf("ifnet: symbol not defined\n");
 215                 return;
 216         }
 217         if (interval1) {
 218                 sidewaysintpr(interval1, ifnetaddr);
 219                 return;
 220         }
 221         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead) != 0)
 222                 return;
 223         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 224         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
 225                 return;
 226
 227         if (!pfunc) {
 228                 if (Wflag)
 229                         printf("%-7.7s", "Name");
 230                 else
 231                         printf("%-5.5s", "Name");
 232                 printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s %5.5s",
 233                     "Mtu", "Network", "Address", "Ipkts", "Ierrs", "Idrop");
 234                 if (bflag)
 235                         printf(" %10.10s","Ibytes");
 236                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 237                 if (bflag)
 238                         printf(" %10.10s","Obytes");
 239                 printf(" %5s", "Coll");
 240                 if (tflag)
 241                         printf(" %s", "Time");
 242                 if (dflag)
 243                         printf(" %s", "Drop");
 244                 putchar('\n');
 245         }
 246         ifaddraddr = 0;
 247         while (ifnetaddr || ifaddraddr) {
 248                 struct sockaddr_in *sockin;
 249 #ifdef INET6
 250                 struct sockaddr_in6 *sockin6;
 251 #endif
 252                 char *cp;
 253                 int n, m;
 254
 255                 network_layer = 0;
 256                 link_layer = 0;
 257
 258                 if (ifaddraddr == 0) {
 259                         ifnetfound = ifnetaddr;
 260                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
 261                                 return;
 262                         strlcpy(name, ifnet.if_xname, sizeof(name));
 263                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 264                         if (interface != 0 && strcmp(name, interface) != 0)
 265                                 continue;
 266                         cp = index(name, '\0');
 267
 268                         if (pfunc) {
 269                                 (*pfunc)(name);
 270                                 continue;
 271                         }
 272
 273                         if ((ifnet.if_flags&IFF_UP) == 0)
 274                                 *cp++ = '*';
 275                         *cp = '\0';
 276                         ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
 277                 }
 278                 ifaddrfound = ifaddraddr;
 279
 280                 /*
 281                  * Get the interface stats.  These may get
 282                  * overriden below on a per-interface basis.
 283                  */
 284                 opackets = ifnet.if_opackets;
 285                 ipackets = ifnet.if_ipackets;
 286                 obytes = ifnet.if_obytes;
 287                 ibytes = ifnet.if_ibytes;
 288                 omcasts = ifnet.if_omcasts;
 289                 imcasts = ifnet.if_imcasts;
 290                 oerrors = ifnet.if_oerrors;
 291                 ierrors = ifnet.if_ierrors;
 292                 idrops = ifnet.if_iqdrops;
 293                 collisions = ifnet.if_collisions;
 294                 timer = ifnet.if_timer;
 295                 drops = ifnet.if_snd.ifq_drops;
 296
 297                 if (ifaddraddr == 0) {
 298                         if (Wflag)
 299                                 printf("%-7.7s", name);
 300                         else
 301                                 printf("%-5.5s", name);
 302                         printf(" %5lu ", ifnet.if_mtu);
 303                         printf("%-13.13s ", "none");
 304                         printf("%-17.17s ", "none");
 305                 } else {
 306                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)
 307                             != 0) {
 308                                 ifaddraddr = 0;
 309                                 continue;
 310                         }
 311 #define CP(x) ((char *)(x))
 312                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 313                                 CP(&ifaddr);
 314                         sa = (struct sockaddr *)cp;
 315                         if (af != AF_UNSPEC && sa->sa_family != af) {
 316                                 ifaddraddr =
 317                                     (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 318                                 continue;
 319                         }
 320                         if (Wflag)
 321                                 printf("%-7.7s", name);
 322                         else
 323                                 printf("%-5.5s", name);
 324                         printf(" %5lu ", ifnet.if_mtu);
 325                         switch (sa->sa_family) {
 326                         case AF_UNSPEC:
 327                                 printf("%-13.13s ", "none");
 328                                 printf("%-15.15s ", "none");
 329                                 break;
 330                         case AF_INET:
 331                                 sockin = (struct sockaddr_in *)sa;
 332 #ifdef notdef
 333                                 /* can't use inet_makeaddr because kernel
 334                                  * keeps nets unshifted.
 335                                  */
 336                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 337                                         INADDR_ANY);
 338                                 printf("%-13.13s ", netname(in.s_addr,
 339                                     ifaddr.in.ia_subnetmask));
 340 #else
 341                                 printf("%-13.13s ",
 342                                     netname(htonl(ifaddr.in.ia_subnet),
 343                                     ifaddr.in.ia_subnetmask));
 344 #endif
 345                                 printf("%-17.17s ",
 346                                     routename(sockin->sin_addr.s_addr));
 347
 348                                 network_layer = 1;
 349                                 break;
 350 #ifdef INET6
 351                         case AF_INET6:
 352                                 sockin6 = (struct sockaddr_in6 *)sa;
 353                                 in6_fillscopeid(&ifaddr.in6.ia_addr);
 354                                 printf("%-13.13s ",
 355                                        netname6(&ifaddr.in6.ia_addr,
 356                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 357                                 in6_fillscopeid(sockin6);
 358                                 getnameinfo(sa, sa->sa_len, addr_buf,
 359                                     sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 360                                 printf("%-17.17s ", addr_buf);
 361
 362                                 network_layer = 1;
 363                                 break;
 364 #endif /*INET6*/
 365                         case AF_IPX:
 366                                 {
 367                                 struct sockaddr_ipx *sipx =
 368                                         (struct sockaddr_ipx *)sa;
 369                                 u_long net;
 370                                 char netnum[10];
 371
 372                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 373                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 374                                 printf("ipx:%-8s  ", netnum);
 375 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 376                                 printf("%-17s ",
 377                                     ipx_phost((struct sockaddr *)sipx));
 378                                 }
 379
 380                                 network_layer = 1;
 381                                 break;
 382
 383                         case AF_APPLETALK:
 384                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 385                                 printf("%-11.11s  ",atalk_print(sa,0x0b) );
 386                                 break;
 387                         case AF_LINK:
 388                                 {
 389                                 struct sockaddr_dl *sdl =
 390                                         (struct sockaddr_dl *)sa;
 391                                 char linknum[10];
 392                                 cp = (char *)LLADDR(sdl);
 393                                 n = sdl->sdl_alen;
 394                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 395                                 m = printf("%-13.13s ", linknum);
 396                                 }
 397                                 goto hexprint;
 398                         default:
 399                                 m = printf("(%d)", sa->sa_family);
 400                                 for (cp = sa->sa_len + (char *)sa;
 401                                         --cp > sa->sa_data && (*cp == 0);) {}
 402                                 n = cp - sa->sa_data + 1;
 403                                 cp = sa->sa_data;
 404                         hexprint:
 405                                 while ((--n >= 0) && (m < 30))
 406                                         m += printf("%02x%c", *cp++ & 0xff,
 407                                                     n > 0 ? ':' : ' ');
 408                                 m = 32 - m;
 409                                 while (m-- > 0)
 410                                         putchar(' ');
 411
 412                                 link_layer = 1;
 413                                 break;
 414                         }
 415
 416                         /*
 417                          * Fixup the statistics for interfaces that
 418                          * update stats for their network addresses
 419                          */
 420                         if (network_layer) {
 421                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 422                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 423                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 424                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 425                         }
 426
 427                         ifaddraddr = (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 428                 }
 429
 430                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 431                 show_stat("lu", 5, ierrors, link_layer);
 432                 show_stat("lu", 5, idrops, link_layer);
 433                 if (bflag)
 434                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 435
 436                 show_stat("lu", 8, opackets, link_layer|network_layer);
 437                 show_stat("lu", 5, oerrors, link_layer);
 438                 if (bflag)
 439                         show_stat("lu", 10, obytes, link_layer|network_layer);
 440
 441                 show_stat("NRSlu", 5, collisions, link_layer);
 442                 if (tflag)
 443                         show_stat("LSd", 4, timer, link_layer);
 444                 if (dflag)
 445                         show_stat("LSd", 4, drops, link_layer);
 446                 putchar('\n');
 447
 448                 if (aflag && ifaddrfound) {
 449                         /*
 450                          * Print family's multicast addresses
 451                          */
 452                         struct ifmultiaddr *multiaddr;
 453                         struct ifmultiaddr ifma;
 454                         union {
 455                                 struct sockaddr sa;
 456                                 struct sockaddr_in in;
 457 #ifdef INET6
 458                                 struct sockaddr_in6 in6;
 459 #endif /* INET6 */
 460                                 struct sockaddr_dl dl;
 461                         } msa;
 462                         const char *fmt;
 463
 464                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 465                                 if (kread((u_long)multiaddr, (char *)&ifma,
 466                                           sizeof ifma) != 0)
 467                                         break;
 468                                 multiaddr = &ifma;
 469                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 470                                           sizeof msa) != 0)
 471                                         break;
 472                                 if (msa.sa.sa_family != sa->sa_family)
 473                                         continue;
 474
 475                                 fmt = 0;
 476                                 switch (msa.sa.sa_family) {
 477                                 case AF_INET:
 478                                         fmt = routename(msa.in.sin_addr.s_addr);
 479                                         break;
 480 #ifdef INET6
 481                                 case AF_INET6:
 482                                         in6_fillscopeid(&msa.in6);
 483                                         getnameinfo(&msa.sa, msa.sa.sa_len,
 484                                             addr_buf, sizeof(addr_buf), 0, 0,
 485                                             NI_NUMERICHOST);
 486                                         printf("%*s %-19.19s(refs: %d)\n",
 487                                                Wflag ? 27 : 25, "",
 488                                                addr_buf, ifma.ifma_refcount);
 489                                         break;
 490 #endif /* INET6 */
 491                                 case AF_LINK:
 492                                         switch (msa.dl.sdl_type) {
 493                                         case IFT_ETHER:
 494                                         case IFT_FDDI:
 495                                                 fmt = ether_ntoa(
 496                                                         (struct ether_addr *)
 497                                                         LLADDR(&msa.dl));
 498                                                 break;
 499                                         }
 500                                         break;
 501                                 }
 502                                 if (fmt) {
 503                                         printf("%*s %-17.17s",
 504                                             Wflag ? 27 : 25, "", fmt);
 505                                         if (msa.sa.sa_family == AF_LINK) {
 506                                                 printf(" %8lu", imcasts);
 507                                                 printf("%*s",
 508                                                     bflag ? 17 : 6, "");
 509                                                 printf(" %8lu", omcasts);
 510                                         }
 511                                         putchar('\n');
 512                                 }
 513                         }
 514                 }
 515         }
 516 }
 517
 518 struct  iftot {
 519         SLIST_ENTRY(iftot) chain;
 520         char    ift_name[IFNAMSIZ];     /* interface name */
 521         u_long  ift_ip;                 /* input packets */
 522         u_long  ift_ie;                 /* input errors */
 523         u_long  ift_id;                 /* input drops */
 524         u_long  ift_op;                 /* output packets */
 525         u_long  ift_oe;                 /* output errors */
 526         u_long  ift_co;                 /* collisions */
 527         u_int   ift_dr;                 /* drops */
 528         u_long  ift_ib;                 /* input bytes */
 529         u_long  ift_ob;                 /* output bytes */
 530 };
 531
 532 u_char  signalled;                      /* set if alarm goes off "early" */
 533
 534 /*
 535  * Print a running summary of interface statistics.
 536  * Repeat display every interval1 seconds, showing statistics
 537  * collected over that interval.  Assumes that interval1 is non-zero.
 538  * First line printed at top of screen is always cumulative.
 539  * XXX - should be rewritten to use ifmib(4).
 540  */
 541 static void
 542 sidewaysintpr(int interval1, u_long off)
 543 {
 544         struct ifnet ifnet;
 545         u_long firstifnet;
 546         struct ifnethead ifnethead;
 547         struct itimerval interval_it;
 548         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 549         int line;
 550         int oldmask, first;
 551         u_long interesting_off;
 552
 553         if (kread(off, (char *)&ifnethead, sizeof ifnethead) != 0)
 554                 return;
 555         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 556
 557         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 558                 printf("malloc failed\n");
 559                 exit(1);
 560         }
 561         memset(iftot, 0, sizeof(struct iftot));
 562
 563         interesting = NULL;
 564         interesting_off = 0;
 565         for (off = firstifnet, ip = iftot; off;) {
 566                 char name[IFNAMSIZ];
 567
 568                 if (kread(off, (char *)&ifnet, sizeof ifnet) != 0)
 569                         break;
 570                 strlcpy(name, ifnet.if_xname, sizeof(name));
 571                 if (interface && strcmp(name, interface) == 0) {
 572                         interesting = ip;
 573                         interesting_off = off;
 574                 }
 575                 snprintf(ip->ift_name, sizeof(ip->ift_name), "(%s)", name);;
 576                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 577                         printf("malloc failed\n");
 578                         exit(1);
 579                 }
 580                 memset(ipn, 0, sizeof(struct iftot));
 581                 SLIST_NEXT(ip, chain) = ipn;
 582                 ip = ipn;
 583                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 584         }
 585         if (interface && interesting == NULL)
 586                 errx(1, "%s: unknown interface", interface);
 587         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 588                 printf("malloc failed\n");
 589                 exit(1);
 590         }
 591         memset(total, 0, sizeof(struct iftot));
 592         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 593                 printf("malloc failed\n");
 594                 exit(1);
 595         }
 596         memset(sum, 0, sizeof(struct iftot));
 597
 598         (void)signal(SIGALRM, catchalarm);
 599         signalled = NO;
 600         interval_it.it_interval.tv_sec = interval1;
 601         interval_it.it_interval.tv_usec = 0;
 602         interval_it.it_value = interval_it.it_interval;
 603         setitimer(ITIMER_REAL, &interval_it, NULL);
 604         first = 1;
 605 banner:
 606         printf("%17s %14s %16s", "input",
 607             interesting ? interesting->ift_name : "(Total)", "output");
 608         putchar('\n');
 609         printf("%10s %5s %5s %10s %10s %5s %10s %5s",
 610             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 611             "colls");
 612         if (dflag)
 613                 printf(" %5.5s", "drops");
 614         putchar('\n');
 615         fflush(stdout);
 616         line = 0;
 617 loop:
 618         if (interesting != NULL) {
 619                 ip = interesting;
 620                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet) != 0) {
 621                         printf("???\n");
 622                         exit(1);
 623                 };
 624                 if (!first) {
 625                         show_stat("lu", 10, ifnet.if_ipackets - ip->ift_ip, 1);
 626                         show_stat("lu", 5, ifnet.if_ierrors - ip->ift_ie, 1);
 627                         show_stat("lu", 5, ifnet.if_iqdrops - ip->ift_id, 1);
 628                         show_stat("lu", 10, ifnet.if_ibytes - ip->ift_ib, 1);
 629                         show_stat("lu", 10, ifnet.if_opackets - ip->ift_op, 1);
 630                         show_stat("lu", 5, ifnet.if_oerrors - ip->ift_oe, 1);
 631                         show_stat("lu", 10, ifnet.if_obytes - ip->ift_ob, 1);
 632                         show_stat("NRSlu", 5,
 633                             ifnet.if_collisions - ip->ift_co, 1);
 634                         if (dflag)
 635                                 show_stat("LSu", 5,
 636                                     ifnet.if_snd.ifq_drops - ip->ift_dr, 1);
 637                 }
 638                 ip->ift_ip = ifnet.if_ipackets;
 639                 ip->ift_ie = ifnet.if_ierrors;
 640                 ip->ift_id = ifnet.if_iqdrops;
 641                 ip->ift_ib = ifnet.if_ibytes;
 642                 ip->ift_op = ifnet.if_opackets;
 643                 ip->ift_oe = ifnet.if_oerrors;
 644                 ip->ift_ob = ifnet.if_obytes;
 645                 ip->ift_co = ifnet.if_collisions;
 646                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 647         } else {
 648                 sum->ift_ip = 0;
 649                 sum->ift_ie = 0;
 650                 sum->ift_id = 0;
 651                 sum->ift_ib = 0;
 652                 sum->ift_op = 0;
 653                 sum->ift_oe = 0;
 654                 sum->ift_ob = 0;
 655                 sum->ift_co = 0;
 656                 sum->ift_dr = 0;
 657                 for (off = firstifnet, ip = iftot;
 658                      off && SLIST_NEXT(ip, chain) != NULL;
 659                      ip = SLIST_NEXT(ip, chain)) {
 660                         if (kread(off, (char *)&ifnet, sizeof ifnet) != 0) {
 661                                 off = 0;
 662                                 continue;
 663                         }
 664                         sum->ift_ip += ifnet.if_ipackets;
 665                         sum->ift_ie += ifnet.if_ierrors;
 666                         sum->ift_id += ifnet.if_iqdrops;
 667                         sum->ift_ib += ifnet.if_ibytes;
 668                         sum->ift_op += ifnet.if_opackets;
 669                         sum->ift_oe += ifnet.if_oerrors;
 670                         sum->ift_ob += ifnet.if_obytes;
 671                         sum->ift_co += ifnet.if_collisions;
 672                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 673                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 674                 }
 675                 if (!first) {
 676                         show_stat("lu", 10, sum->ift_ip - total->ift_ip, 1);
 677                         show_stat("lu", 5, sum->ift_ie - total->ift_ie, 1);
 678                         show_stat("lu", 5, sum->ift_id - total->ift_id, 1);
 679                         show_stat("lu", 10, sum->ift_ib - total->ift_ib, 1);
 680                         show_stat("lu", 10, sum->ift_op - total->ift_op, 1);
 681                         show_stat("lu", 5, sum->ift_oe - total->ift_oe, 1);
 682                         show_stat("lu", 10, sum->ift_ob - total->ift_ob, 1);
 683                         show_stat("NRSlu", 5, sum->ift_co - total->ift_co, 1);
 684                         if (dflag)
 685                                 show_stat("LSu", 5,
 686                                     sum->ift_dr - total->ift_dr, 1);
 687                 }
 688                 *total = *sum;
 689         }
 690         if (!first)
 691                 putchar('\n');
 692         fflush(stdout);
 693         if ((noutputs != 0) && (--noutputs == 0))
 694                 exit(0);
 695         oldmask = sigblock(sigmask(SIGALRM));
 696         while (!signalled)
 697                 sigpause(0);
 698         signalled = NO;
 699         sigsetmask(oldmask);
 700         line++;
 701         first = 0;
 702         if (line == 21)
 703                 goto banner;
 704         else
 705                 goto loop;
 706         /*NOTREACHED*/
 707 }
 708
 709 /*
 710  * Set a flag to indicate that a signal from the periodic itimer has been
 711  * caught.
 712  */
 713 static void
 714 catchalarm(int signo __unused)
 715 {
 716         signalled = YES;
 717 }