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/bridge.h>
  55 #include <net/ethernet.h>
  56 #include <net/pfvar.h>
  57 #include <net/if_pfsync.h>
  58 #include <netinet/in.h>
  59 #include <netinet/in_var.h>
  60 #include <netipx/ipx.h>
  61 #include <netipx/ipx_if.h>
  62 #include <arpa/inet.h>
  63
  64 #include <err.h>
  65 #include <errno.h>
  66 #include <libutil.h>
  67 #include <signal.h>
  68 #include <stdint.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73
  74 #include "netstat.h"
  75
  76 #define YES     1
  77 #define NO      0
  78
  79 static void sidewaysintpr(int, u_long);
  80 static void catchalarm(int);
  81
  82 #ifdef INET6
  83 static int bdg_done;
  84 static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
  85 #endif
  86
  87 /* print bridge statistics */
  88 void
  89 bdg_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
  90 {
  91     struct bdg_stats s;
  92     size_t slen;
  93     int i;
  94
  95     slen = sizeof(s);
  96     if (live) {
  97         if (sysctlbyname("net.link.ether.bdgstats", &s, &slen, NULL, 0) < 0) {
  98             if (errno != ENOENT)
  99                 warn("sysctl: net.link.ether.bdgstats");
 100             return;
 101         }
 102     } else
 103         kread(off, &s, slen);
 104
 105 #ifdef INET6
 106     if (bdg_done != 0)
 107         return;
 108     else
 109         bdg_done = 1;
 110 #endif
 111     printf("-- Bridging statistics (%s) --\n", name) ;
 112     printf(
 113 "Name          In      Out  Forward     Drop    Bcast    Mcast    Local  Unknown\n");
 114     for (i = 0 ; i < 16 ; i++) {
 115         if (s.s[i].name[0])
 116         printf("%-6s %9ld%9ld%9ld%9ld%9ld%9ld%9ld%9ld\n",
 117           s.s[i].name,
 118           s.s[i].p_in[(int)BDG_IN],
 119           s.s[i].p_in[(int)BDG_OUT],
 120           s.s[i].p_in[(int)BDG_FORWARD],
 121           s.s[i].p_in[(int)BDG_DROP],
 122           s.s[i].p_in[(int)BDG_BCAST],
 123           s.s[i].p_in[(int)BDG_MCAST],
 124           s.s[i].p_in[(int)BDG_LOCAL],
 125           s.s[i].p_in[(int)BDG_UNKNOWN] );
 126     }
 127 }
 128
 129 /*
 130  * Dump pfsync statistics structure.
 131  */
 132 void
 133 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 134 {
 135         struct pfsyncstats pfsyncstat, zerostat;
 136         size_t len = sizeof(struct pfsyncstats);
 137
 138         if (live) {
 139                 if (zflag)
 140                         memset(&zerostat, 0, len);
 141                 if (sysctlbyname("net.inet.pfsync.stats", &pfsyncstat, &len,
 142                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 143                         if (errno != ENOENT)
 144                                 warn("sysctl: net.inet.pfsync.stats");
 145                         return;
 146                 }
 147         } else
 148                 kread(off, &pfsyncstat, len);
 149
 150         printf("%s:\n", name);
 151
 152 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 153         printf(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 154 #define p2(f, m) if (pfsyncstat.f || sflag <= 1) \
 155         printf(m, (uintmax_t)pfsyncstat.f)
 156
 157         p(pfsyncs_ipackets, "\t%ju packet%s received (IPv4)\n");
 158         p(pfsyncs_ipackets6, "\t%ju packet%s received (IPv6)\n");
 159         p(pfsyncs_badif, "\t\t%ju packet%s discarded for bad interface\n");
 160         p(pfsyncs_badttl, "\t\t%ju packet%s discarded for bad ttl\n");
 161         p(pfsyncs_hdrops, "\t\t%ju packet%s shorter than header\n");
 162         p(pfsyncs_badver, "\t\t%ju packet%s discarded for bad version\n");
 163         p(pfsyncs_badauth, "\t\t%ju packet%s discarded for bad HMAC\n");
 164         p(pfsyncs_badact,"\t\t%ju packet%s discarded for bad action\n");
 165         p(pfsyncs_badlen, "\t\t%ju packet%s discarded for short packet\n");
 166         p(pfsyncs_badval, "\t\t%ju state%s discarded for bad values\n");
 167         p(pfsyncs_stale, "\t\t%ju stale state%s\n");
 168         p(pfsyncs_badstate, "\t\t%ju failed state lookup/insert%s\n");
 169         p(pfsyncs_opackets, "\t%ju packet%s sent (IPv4)\n");
 170         p(pfsyncs_opackets6, "\t%ju packet%s sent (IPv6)\n");
 171         p2(pfsyncs_onomem, "\t\t%ju send failed due to mbuf memory error\n");
 172         p2(pfsyncs_oerrors, "\t\t%ju send error\n");
 173 #undef p
 174 #undef p2
 175 }
 176
 177 /*
 178  * Display a formatted value, or a '-' in the same space.
 179  */
 180 static void
 181 show_stat(const char *fmt, int width, u_long value, short showvalue)
 182 {
 183         const char *lsep, *rsep;
 184         char newfmt[32];
 185
 186         lsep = "";
 187         if (strncmp(fmt, "LS", 2) == 0) {
 188                 lsep = " ";
 189                 fmt += 2;
 190         }
 191         rsep = " ";
 192         if (strncmp(fmt, "NRS", 3) == 0) {
 193                 rsep = "";
 194                 fmt += 3;
 195         }
 196         if (showvalue == 0) {
 197                 /* Print just dash. */
 198                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 199                 printf(newfmt, "-");
 200                 return;
 201         }
 202
 203         if (hflag) {
 204                 char buf[5];
 205
 206                 /* Format in human readable form. */
 207                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 208                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL);
 209                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 210                 printf(newfmt, buf);
 211         } else {
 212                 /* Construct the format string. */
 213                 sprintf(newfmt, "%s%%%d%s%s", lsep, width, fmt, rsep);
 214                 printf(newfmt, value);
 215         }
 216 }
 217
 218 /*
 219  * Print a description of the network interfaces.
 220  */
 221 void
 222 intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *))
 223 {
 224         struct ifnet ifnet;
 225         struct ifnethead ifnethead;
 226         union {
 227                 struct ifaddr ifa;
 228                 struct in_ifaddr in;
 229 #ifdef INET6
 230                 struct in6_ifaddr in6;
 231 #endif
 232                 struct ipx_ifaddr ipx;
 233         } ifaddr;
 234         u_long ifaddraddr;
 235         u_long ifaddrfound;
 236         u_long ifnetfound;
 237         u_long opackets;
 238         u_long ipackets;
 239         u_long obytes;
 240         u_long ibytes;
 241         u_long omcasts;
 242         u_long imcasts;
 243         u_long oerrors;
 244         u_long ierrors;
 245         u_long collisions;
 246         short timer;
 247         int drops;
 248         struct sockaddr *sa = NULL;
 249         char name[IFNAMSIZ];
 250         short network_layer;
 251         short link_layer;
 252
 253         if (ifnetaddr == 0) {
 254                 printf("ifnet: symbol not defined\n");
 255                 return;
 256         }
 257         if (interval1) {
 258                 sidewaysintpr(interval1, ifnetaddr);
 259                 return;
 260         }
 261         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead))
 262                 return;
 263         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 264         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 265                 return;
 266
 267         if (!pfunc) {
 268                 if (Wflag)
 269                         printf("%-7.7s", "Name");
 270                 else
 271                         printf("%-5.5s", "Name");
 272                 printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s",
 273                     "Mtu", "Network", "Address", "Ipkts", "Ierrs");
 274                 if (bflag)
 275                         printf(" %10.10s","Ibytes");
 276                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 277                 if (bflag)
 278                         printf(" %10.10s","Obytes");
 279                 printf(" %5s", "Coll");
 280                 if (tflag)
 281                         printf(" %s", "Time");
 282                 if (dflag)
 283                         printf(" %s", "Drop");
 284                 putchar('\n');
 285         }
 286         ifaddraddr = 0;
 287         while (ifnetaddr || ifaddraddr) {
 288                 struct sockaddr_in *sockin;
 289 #ifdef INET6
 290                 struct sockaddr_in6 *sockin6;
 291 #endif
 292                 char *cp;
 293                 int n, m;
 294
 295                 network_layer = 0;
 296                 link_layer = 0;
 297
 298                 if (ifaddraddr == 0) {
 299                         ifnetfound = ifnetaddr;
 300                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 301                                 return;
 302                         strlcpy(name, ifnet.if_xname, sizeof(name));
 303                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 304                         if (interface != 0 && (strcmp(name, interface) != 0))
 305                                 continue;
 306                         cp = index(name, '\0');
 307
 308                         if (pfunc) {
 309                                 (*pfunc)(name);
 310                                 continue;
 311                         }
 312
 313                         if ((ifnet.if_flags&IFF_UP) == 0)
 314                                 *cp++ = '*';
 315                         *cp = '\0';
 316                         ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
 317                 }
 318                 ifaddrfound = ifaddraddr;
 319
 320                 /*
 321                  * Get the interface stats.  These may get
 322                  * overriden below on a per-interface basis.
 323                  */
 324                 opackets = ifnet.if_opackets;
 325                 ipackets = ifnet.if_ipackets;
 326                 obytes = ifnet.if_obytes;
 327                 ibytes = ifnet.if_ibytes;
 328                 omcasts = ifnet.if_omcasts;
 329                 imcasts = ifnet.if_imcasts;
 330                 oerrors = ifnet.if_oerrors;
 331                 ierrors = ifnet.if_ierrors;
 332                 collisions = ifnet.if_collisions;
 333                 timer = ifnet.if_timer;
 334                 drops = ifnet.if_snd.ifq_drops;
 335
 336                 if (ifaddraddr == 0) {
 337                         if (Wflag)
 338                                 printf("%-7.7s", name);
 339                         else
 340                                 printf("%-5.5s", name);
 341                         printf(" %5lu ", ifnet.if_mtu);
 342                         printf("%-13.13s ", "none");
 343                         printf("%-17.17s ", "none");
 344                 } else {
 345                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
 346                                 ifaddraddr = 0;
 347                                 continue;
 348                         }
 349 #define CP(x) ((char *)(x))
 350                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 351                                 CP(&ifaddr);
 352                         sa = (struct sockaddr *)cp;
 353                         if (af != AF_UNSPEC && sa->sa_family != af) {
 354                                 ifaddraddr =
 355                                     (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 356                                 continue;
 357                         }
 358                         if (Wflag)
 359                                 printf("%-7.7s", name);
 360                         else
 361                                 printf("%-5.5s", name);
 362                         printf(" %5lu ", ifnet.if_mtu);
 363                         switch (sa->sa_family) {
 364                         case AF_UNSPEC:
 365                                 printf("%-13.13s ", "none");
 366                                 printf("%-15.15s ", "none");
 367                                 break;
 368                         case AF_INET:
 369                                 sockin = (struct sockaddr_in *)sa;
 370 #ifdef notdef
 371                                 /* can't use inet_makeaddr because kernel
 372                                  * keeps nets unshifted.
 373                                  */
 374                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 375                                         INADDR_ANY);
 376                                 printf("%-13.13s ", netname(in.s_addr,
 377                                     ifaddr.in.ia_subnetmask));
 378 #else
 379                                 printf("%-13.13s ",
 380                                     netname(htonl(ifaddr.in.ia_subnet),
 381                                     ifaddr.in.ia_subnetmask));
 382 #endif
 383                                 printf("%-17.17s ",
 384                                     routename(sockin->sin_addr.s_addr));
 385
 386                                 network_layer = 1;
 387                                 break;
 388 #ifdef INET6
 389                         case AF_INET6:
 390                                 sockin6 = (struct sockaddr_in6 *)sa;
 391                                 printf("%-13.13s ",
 392                                        netname6(&ifaddr.in6.ia_addr,
 393                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 394                                 printf("%-17.17s ",
 395                                     inet_ntop(AF_INET6,
 396                                         &sockin6->sin6_addr,
 397                                         ntop_buf, sizeof(ntop_buf)));
 398
 399                                 network_layer = 1;
 400                                 break;
 401 #endif /*INET6*/
 402                         case AF_IPX:
 403                                 {
 404                                 struct sockaddr_ipx *sipx =
 405                                         (struct sockaddr_ipx *)sa;
 406                                 u_long net;
 407                                 char netnum[10];
 408
 409                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 410                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 411                                 printf("ipx:%-8s  ", netnum);
 412 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 413                                 printf("%-17s ",
 414                                     ipx_phost((struct sockaddr *)sipx));
 415                                 }
 416
 417                                 network_layer = 1;
 418                                 break;
 419
 420                         case AF_APPLETALK:
 421                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 422                                 printf("%-11.11s  ",atalk_print(sa,0x0b) );
 423                                 break;
 424                         case AF_LINK:
 425                                 {
 426                                 struct sockaddr_dl *sdl =
 427                                         (struct sockaddr_dl *)sa;
 428                                 char linknum[10];
 429                                 cp = (char *)LLADDR(sdl);
 430                                 n = sdl->sdl_alen;
 431                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 432                                 m = printf("%-13.13s ", linknum);
 433                                 }
 434                                 goto hexprint;
 435                         default:
 436                                 m = printf("(%d)", sa->sa_family);
 437                                 for (cp = sa->sa_len + (char *)sa;
 438                                         --cp > sa->sa_data && (*cp == 0);) {}
 439                                 n = cp - sa->sa_data + 1;
 440                                 cp = sa->sa_data;
 441                         hexprint:
 442                                 while (--n >= 0)
 443                                         m += printf("%02x%c", *cp++ & 0xff,
 444                                                     n > 0 ? ':' : ' ');
 445                                 m = 32 - m;
 446                                 while (m-- > 0)
 447                                         putchar(' ');
 448
 449                                 link_layer = 1;
 450                                 break;
 451                         }
 452
 453                         /*
 454                          * Fixup the statistics for interfaces that
 455                          * update stats for their network addresses
 456                          */
 457                         if (network_layer) {
 458                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 459                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 460                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 461                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 462                         }
 463
 464                         ifaddraddr = (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 465                 }
 466
 467                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 468                 show_stat("lu", 5, ierrors, link_layer);
 469                 if (bflag)
 470                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 471
 472                 show_stat("lu", 8, opackets, link_layer|network_layer);
 473                 show_stat("lu", 5, oerrors, link_layer);
 474                 if (bflag)
 475                         show_stat("lu", 10, obytes, link_layer|network_layer);
 476
 477                 show_stat("NRSlu", 5, collisions, link_layer);
 478                 if (tflag)
 479                         show_stat("LSd", 4, timer, link_layer);
 480                 if (dflag)
 481                         show_stat("LSd", 4, drops, link_layer);
 482                 putchar('\n');
 483
 484                 if (aflag && ifaddrfound) {
 485                         /*
 486                          * Print family's multicast addresses
 487                          */
 488                         struct ifmultiaddr *multiaddr;
 489                         struct ifmultiaddr ifma;
 490                         union {
 491                                 struct sockaddr sa;
 492                                 struct sockaddr_in in;
 493 #ifdef INET6
 494                                 struct sockaddr_in6 in6;
 495 #endif /* INET6 */
 496                                 struct sockaddr_dl dl;
 497                         } msa;
 498                         const char *fmt;
 499
 500                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 501                                 if (kread((u_long)multiaddr, (char *)&ifma,
 502                                           sizeof ifma))
 503                                         break;
 504                                 multiaddr = &ifma;
 505                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 506                                           sizeof msa))
 507                                         break;
 508                                 if (msa.sa.sa_family != sa->sa_family)
 509                                         continue;
 510
 511                                 fmt = 0;
 512                                 switch (msa.sa.sa_family) {
 513                                 case AF_INET:
 514                                         fmt = routename(msa.in.sin_addr.s_addr);
 515                                         break;
 516 #ifdef INET6
 517                                 case AF_INET6:
 518                                         printf("%*s %-19.19s(refs: %d)\n",
 519                                                Wflag ? 27 : 25, "",
 520                                                inet_ntop(AF_INET6,
 521                                                          &msa.in6.sin6_addr,
 522                                                          ntop_buf,
 523                                                          sizeof(ntop_buf)),
 524                                                ifma.ifma_refcount);
 525                                         break;
 526 #endif /* INET6 */
 527                                 case AF_LINK:
 528                                         switch (msa.dl.sdl_type) {
 529                                         case IFT_ETHER:
 530                                         case IFT_FDDI:
 531                                                 fmt = ether_ntoa(
 532                                                         (struct ether_addr *)
 533                                                         LLADDR(&msa.dl));
 534                                                 break;
 535                                         }
 536                                         break;
 537                                 }
 538                                 if (fmt) {
 539                                         printf("%*s %-17.17s",
 540                                             Wflag ? 27 : 25, "", fmt);
 541                                         if (msa.sa.sa_family == AF_LINK) {
 542                                                 printf(" %8lu", imcasts);
 543                                                 printf("%*s",
 544                                                     bflag ? 17 : 6, "");
 545                                                 printf(" %8lu", omcasts);
 546                                         }
 547                                         putchar('\n');
 548                                 }
 549                         }
 550                 }
 551         }
 552 }
 553
 554 struct  iftot {
 555         SLIST_ENTRY(iftot) chain;
 556         char    ift_name[IFNAMSIZ];     /* interface name */
 557         u_long  ift_ip;                 /* input packets */
 558         u_long  ift_ie;                 /* input errors */
 559         u_long  ift_op;                 /* output packets */
 560         u_long  ift_oe;                 /* output errors */
 561         u_long  ift_co;                 /* collisions */
 562         u_int   ift_dr;                 /* drops */
 563         u_long  ift_ib;                 /* input bytes */
 564         u_long  ift_ob;                 /* output bytes */
 565 };
 566
 567 u_char  signalled;                      /* set if alarm goes off "early" */
 568
 569 /*
 570  * Print a running summary of interface statistics.
 571  * Repeat display every interval1 seconds, showing statistics
 572  * collected over that interval.  Assumes that interval1 is non-zero.
 573  * First line printed at top of screen is always cumulative.
 574  * XXX - should be rewritten to use ifmib(4).
 575  */
 576 static void
 577 sidewaysintpr(int interval1, u_long off)
 578 {
 579         struct ifnet ifnet;
 580         u_long firstifnet;
 581         struct ifnethead ifnethead;
 582         struct itimerval interval_it;
 583         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 584         int line;
 585         int oldmask, first;
 586         u_long interesting_off;
 587
 588         if (kread(off, (char *)&ifnethead, sizeof ifnethead))
 589                 return;
 590         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 591
 592         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 593                 printf("malloc failed\n");
 594                 exit(1);
 595         }
 596         memset(iftot, 0, sizeof(struct iftot));
 597
 598         interesting = NULL;
 599         interesting_off = 0;
 600         for (off = firstifnet, ip = iftot; off;) {
 601                 char name[IFNAMSIZ];
 602
 603                 if (kread(off, (char *)&ifnet, sizeof ifnet))
 604                         break;
 605                 strlcpy(name, ifnet.if_xname, sizeof(name));
 606                 if (interface && strcmp(name, interface) == 0) {
 607                         interesting = ip;
 608                         interesting_off = off;
 609                 }
 610                 snprintf(ip->ift_name, sizeof(ip->ift_name), "(%s)", name);;
 611                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 612                         printf("malloc failed\n");
 613                         exit(1);
 614                 }
 615                 memset(ipn, 0, sizeof(struct iftot));
 616                 SLIST_NEXT(ip, chain) = ipn;
 617                 ip = ipn;
 618                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 619         }
 620         if (interface && interesting == NULL)
 621                 errx(1, "%s: unknown interface", interface);
 622         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 623                 printf("malloc failed\n");
 624                 exit(1);
 625         }
 626         memset(total, 0, sizeof(struct iftot));
 627         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 628                 printf("malloc failed\n");
 629                 exit(1);
 630         }
 631         memset(sum, 0, sizeof(struct iftot));
 632
 633         (void)signal(SIGALRM, catchalarm);
 634         signalled = NO;
 635         interval_it.it_interval.tv_sec = interval1;
 636         interval_it.it_interval.tv_usec = 0;
 637         interval_it.it_value = interval_it.it_interval;
 638         setitimer(ITIMER_REAL, &interval_it, NULL);
 639         first = 1;
 640 banner:
 641         printf("%17s %14s %16s", "input",
 642             interesting ? interesting->ift_name : "(Total)", "output");
 643         putchar('\n');
 644         printf("%10s %5s %10s %10s %5s %10s %5s",
 645             "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
 646         if (dflag)
 647                 printf(" %5.5s", "drops");
 648         putchar('\n');
 649         fflush(stdout);
 650         line = 0;
 651 loop:
 652         if (interesting != NULL) {
 653                 ip = interesting;
 654                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet)) {
 655                         printf("???\n");
 656                         exit(1);
 657                 };
 658                 if (!first) {
 659                         show_stat("lu", 10, ifnet.if_ipackets - ip->ift_ip, 1);
 660                         show_stat("lu", 5, ifnet.if_ierrors - ip->ift_ie, 1);
 661                         show_stat("lu", 10, ifnet.if_ibytes - ip->ift_ib, 1);
 662                         show_stat("lu", 10, ifnet.if_opackets - ip->ift_op, 1);
 663                         show_stat("lu", 5, ifnet.if_oerrors - ip->ift_oe, 1);
 664                         show_stat("lu", 10, ifnet.if_obytes - ip->ift_ob, 1);
 665                         show_stat("NRSlu", 5,
 666                             ifnet.if_collisions - ip->ift_co, 1);
 667                         if (dflag)
 668                                 show_stat("LSu", 5,
 669                                     ifnet.if_snd.ifq_drops - ip->ift_dr, 1);
 670                 }
 671                 ip->ift_ip = ifnet.if_ipackets;
 672                 ip->ift_ie = ifnet.if_ierrors;
 673                 ip->ift_ib = ifnet.if_ibytes;
 674                 ip->ift_op = ifnet.if_opackets;
 675                 ip->ift_oe = ifnet.if_oerrors;
 676                 ip->ift_ob = ifnet.if_obytes;
 677                 ip->ift_co = ifnet.if_collisions;
 678                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 679         } else {
 680                 sum->ift_ip = 0;
 681                 sum->ift_ie = 0;
 682                 sum->ift_ib = 0;
 683                 sum->ift_op = 0;
 684                 sum->ift_oe = 0;
 685                 sum->ift_ob = 0;
 686                 sum->ift_co = 0;
 687                 sum->ift_dr = 0;
 688                 for (off = firstifnet, ip = iftot;
 689                      off && SLIST_NEXT(ip, chain) != NULL;
 690                      ip = SLIST_NEXT(ip, chain)) {
 691                         if (kread(off, (char *)&ifnet, sizeof ifnet)) {
 692                                 off = 0;
 693                                 continue;
 694                         }
 695                         sum->ift_ip += ifnet.if_ipackets;
 696                         sum->ift_ie += ifnet.if_ierrors;
 697                         sum->ift_ib += ifnet.if_ibytes;
 698                         sum->ift_op += ifnet.if_opackets;
 699                         sum->ift_oe += ifnet.if_oerrors;
 700                         sum->ift_ob += ifnet.if_obytes;
 701                         sum->ift_co += ifnet.if_collisions;
 702                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 703                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 704                 }
 705                 if (!first) {
 706                         show_stat("lu", 10, sum->ift_ip - total->ift_ip, 1);
 707                         show_stat("lu", 5, sum->ift_ie - total->ift_ie, 1);
 708                         show_stat("lu", 10, sum->ift_ib - total->ift_ib, 1);
 709                         show_stat("lu", 10, sum->ift_op - total->ift_op, 1);
 710                         show_stat("lu", 5, sum->ift_oe - total->ift_oe, 1);
 711                         show_stat("lu", 10, sum->ift_ob - total->ift_ob, 1);
 712                         show_stat("NRSlu", 5, sum->ift_co - total->ift_co, 1);
 713                         if (dflag)
 714                                 show_stat("LSu", 5,
 715                                     sum->ift_dr - total->ift_dr, 1);
 716                 }
 717                 *total = *sum;
 718         }
 719         if (!first)
 720                 putchar('\n');
 721         fflush(stdout);
 722         oldmask = sigblock(sigmask(SIGALRM));
 723         while (!signalled)
 724                 sigpause(0);
 725         signalled = NO;
 726         sigsetmask(oldmask);
 727         line++;
 728         first = 0;
 729         if (line == 21)
 730                 goto banner;
 731         else
 732                 goto loop;
 733         /*NOTREACHED*/
 734 }
 735
 736 /*
 737  * Set a flag to indicate that a signal from the periodic itimer has been
 738  * caught.
 739  */
 740 static void
 741 catchalarm(int signo __unused)
 742 {
 743         signalled = YES;
 744 }