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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if 0
  31 #ifndef lint
  32 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  33 #endif /* not lint */
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/types.h>
  40 #include <sys/protosw.h>
  41 #include <sys/socket.h>
  42 #include <sys/socketvar.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/time.h>
  45
  46 #include <net/if.h>
  47 #include <net/if_var.h>
  48 #include <net/if_dl.h>
  49 #include <net/if_types.h>
  50 #include <net/ethernet.h>
  51 #include <net/pfvar.h>
  52 #include <net/if_pfsync.h>
  53 #include <netinet/in.h>
  54 #include <netinet/in_var.h>
  55 #include <netipx/ipx.h>
  56 #include <netipx/ipx_if.h>
  57 #include <arpa/inet.h>
  58
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <libutil.h>
  62 #ifdef INET6
  63 #include <netdb.h>
  64 #endif
  65 #include <signal.h>
  66 #include <stdint.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71
  72 #include "netstat.h"
  73
  74 #define YES     1
  75 #define NO      0
  76
  77 static void sidewaysintpr(int, u_long);
  78 static void catchalarm(int);
  79
  80 #ifdef INET6
  81 static char addr_buf[NI_MAXHOST];               /* for getnameinfo() */
  82 #endif
  83
  84 static const char* pfsyncacts[] = {
  85         /* PFSYNC_ACT_CLR */            "clear all request",
  86         /* PFSYNC_ACT_INS */            "state insert",
  87         /* PFSYNC_ACT_INS_ACK */        "state inserted ack",
  88         /* PFSYNC_ACT_UPD */            "state update",
  89         /* PFSYNC_ACT_UPD_C */          "compressed state update",
  90         /* PFSYNC_ACT_UPD_REQ */        "uncompressed state request",
  91         /* PFSYNC_ACT_DEL */            "state delete",
  92         /* PFSYNC_ACT_DEL_C */          "compressed state delete",
  93         /* PFSYNC_ACT_INS_F */          "fragment insert",
  94         /* PFSYNC_ACT_DEL_F */          "fragment delete",
  95         /* PFSYNC_ACT_BUS */            "bulk update mark",
  96         /* PFSYNC_ACT_TDB */            "TDB replay counter update",
  97         /* PFSYNC_ACT_EOF */            "end of frame mark",
  98 };
  99
 100 static void
 101 pfsync_acts_stats(const char *fmt, uint64_t *a)
 102 {
 103         int i;
 104
 105         for (i = 0; i < PFSYNC_ACT_MAX; i++, a++)
 106                 if (*a || sflag <= 1)
 107                         printf(fmt, *a, pfsyncacts[i], plural(*a));
 108 }
 109
 110 /*
 111  * Dump pfsync statistics structure.
 112  */
 113 void
 114 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 115 {
 116         struct pfsyncstats pfsyncstat, zerostat;
 117         size_t len = sizeof(struct pfsyncstats);
 118
 119         if (live) {
 120                 if (zflag)
 121                         memset(&zerostat, 0, len);
 122                 if (sysctlbyname("net.pfsync.stats", &pfsyncstat, &len,
 123                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 124                         if (errno != ENOENT)
 125                                 warn("sysctl: net.pfsync.stats");
 126                         return;
 127                 }
 128         } else
 129                 kread(off, &pfsyncstat, len);
 130
 131         printf("%s:\n", name);
 132
 133 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 134         printf(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 135
 136         p(pfsyncs_ipackets, "\t%ju packet%s received (IPv4)\n");
 137         p(pfsyncs_ipackets6, "\t%ju packet%s received (IPv6)\n");
 138         pfsync_acts_stats("\t    %ju %s%s received\n",
 139             &pfsyncstat.pfsyncs_iacts[0]);
 140         p(pfsyncs_badif, "\t\t%ju packet%s discarded for bad interface\n");
 141         p(pfsyncs_badttl, "\t\t%ju packet%s discarded for bad ttl\n");
 142         p(pfsyncs_hdrops, "\t\t%ju packet%s shorter than header\n");
 143         p(pfsyncs_badver, "\t\t%ju packet%s discarded for bad version\n");
 144         p(pfsyncs_badauth, "\t\t%ju packet%s discarded for bad HMAC\n");
 145         p(pfsyncs_badact,"\t\t%ju packet%s discarded for bad action\n");
 146         p(pfsyncs_badlen, "\t\t%ju packet%s discarded for short packet\n");
 147         p(pfsyncs_badval, "\t\t%ju state%s discarded for bad values\n");
 148         p(pfsyncs_stale, "\t\t%ju stale state%s\n");
 149         p(pfsyncs_badstate, "\t\t%ju failed state lookup/insert%s\n");
 150         p(pfsyncs_opackets, "\t%ju packet%s sent (IPv4)\n");
 151         p(pfsyncs_opackets6, "\t%ju packet%s sent (IPv6)\n");
 152         pfsync_acts_stats("\t    %ju %s%s sent\n",
 153             &pfsyncstat.pfsyncs_oacts[0]);
 154         p(pfsyncs_onomem, "\t\t%ju failure%s due to mbuf memory error\n");
 155         p(pfsyncs_oerrors, "\t\t%ju send error%s\n");
 156 #undef p
 157 }
 158
 159 /*
 160  * Display a formatted value, or a '-' in the same space.
 161  */
 162 static void
 163 show_stat(const char *fmt, int width, u_long value, short showvalue)
 164 {
 165         const char *lsep, *rsep;
 166         char newfmt[32];
 167
 168         lsep = "";
 169         if (strncmp(fmt, "LS", 2) == 0) {
 170                 lsep = " ";
 171                 fmt += 2;
 172         }
 173         rsep = " ";
 174         if (strncmp(fmt, "NRS", 3) == 0) {
 175                 rsep = "";
 176                 fmt += 3;
 177         }
 178         if (showvalue == 0) {
 179                 /* Print just dash. */
 180                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 181                 printf(newfmt, "-");
 182                 return;
 183         }
 184
 185         if (hflag) {
 186                 char buf[5];
 187
 188                 /* Format in human readable form. */
 189                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 190                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL);
 191                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 192                 printf(newfmt, buf);
 193         } else {
 194                 /* Construct the format string. */
 195                 sprintf(newfmt, "%s%%%d%s%s", lsep, width, fmt, rsep);
 196                 printf(newfmt, value);
 197         }
 198 }
 199
 200 /*
 201  * Print a description of the network interfaces.
 202  */
 203 void
 204 intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *))
 205 {
 206         struct ifnet ifnet;
 207         struct ifnethead ifnethead;
 208         union {
 209                 struct ifaddr ifa;
 210                 struct in_ifaddr in;
 211 #ifdef INET6
 212                 struct in6_ifaddr in6;
 213 #endif
 214                 struct ipx_ifaddr ipx;
 215         } ifaddr;
 216         u_long ifaddraddr;
 217         u_long ifaddrfound;
 218         u_long opackets;
 219         u_long ipackets;
 220         u_long obytes;
 221         u_long ibytes;
 222         u_long omcasts;
 223         u_long imcasts;
 224         u_long oerrors;
 225         u_long ierrors;
 226         u_long idrops;
 227         u_long collisions;
 228         int drops;
 229         struct sockaddr *sa = NULL;
 230         char name[IFNAMSIZ];
 231         short network_layer;
 232         short link_layer;
 233
 234         if (ifnetaddr == 0) {
 235                 printf("ifnet: symbol not defined\n");
 236                 return;
 237         }
 238         if (interval1) {
 239                 sidewaysintpr(interval1, ifnetaddr);
 240                 return;
 241         }
 242         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead) != 0)
 243                 return;
 244         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 245         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
 246                 return;
 247
 248         if (!pfunc) {
 249                 if (Wflag)
 250                         printf("%-7.7s", "Name");
 251                 else
 252                         printf("%-5.5s", "Name");
 253                 printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s %5.5s",
 254                     "Mtu", "Network", "Address", "Ipkts", "Ierrs", "Idrop");
 255                 if (bflag)
 256                         printf(" %10.10s","Ibytes");
 257                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 258                 if (bflag)
 259                         printf(" %10.10s","Obytes");
 260                 printf(" %5s", "Coll");
 261                 if (dflag)
 262                         printf(" %s", "Drop");
 263                 putchar('\n');
 264         }
 265         ifaddraddr = 0;
 266         while (ifnetaddr || ifaddraddr) {
 267                 struct sockaddr_in *sockin;
 268 #ifdef INET6
 269                 struct sockaddr_in6 *sockin6;
 270 #endif
 271                 char *cp;
 272                 int n, m;
 273
 274                 network_layer = 0;
 275                 link_layer = 0;
 276
 277                 if (ifaddraddr == 0) {
 278                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet) != 0)
 279                                 return;
 280                         strlcpy(name, ifnet.if_xname, sizeof(name));
 281                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 282                         if (interface != 0 && strcmp(name, interface) != 0)
 283                                 continue;
 284                         cp = strchr(name, '\0');
 285
 286                         if (pfunc) {
 287                                 (*pfunc)(name);
 288                                 continue;
 289                         }
 290
 291                         if ((ifnet.if_flags&IFF_UP) == 0)
 292                                 *cp++ = '*';
 293                         *cp = '\0';
 294                         ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
 295                 }
 296                 ifaddrfound = ifaddraddr;
 297
 298                 /*
 299                  * Get the interface stats.  These may get
 300                  * overriden below on a per-interface basis.
 301                  */
 302                 opackets = ifnet.if_opackets;
 303                 ipackets = ifnet.if_ipackets;
 304                 obytes = ifnet.if_obytes;
 305                 ibytes = ifnet.if_ibytes;
 306                 omcasts = ifnet.if_omcasts;
 307                 imcasts = ifnet.if_imcasts;
 308                 oerrors = ifnet.if_oerrors;
 309                 ierrors = ifnet.if_ierrors;
 310                 idrops = ifnet.if_iqdrops;
 311                 collisions = ifnet.if_collisions;
 312                 drops = ifnet.if_snd.ifq_drops;
 313
 314                 if (ifaddraddr == 0) {
 315                         if (Wflag)
 316                                 printf("%-7.7s", name);
 317                         else
 318                                 printf("%-5.5s", name);
 319                         printf(" %5lu ", ifnet.if_mtu);
 320                         printf("%-13.13s ", "none");
 321                         printf("%-17.17s ", "none");
 322                 } else {
 323                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)
 324                             != 0) {
 325                                 ifaddraddr = 0;
 326                                 continue;
 327                         }
 328 #define CP(x) ((char *)(x))
 329                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 330                                 CP(&ifaddr);
 331                         sa = (struct sockaddr *)cp;
 332                         if (af != AF_UNSPEC && sa->sa_family != af) {
 333                                 ifaddraddr =
 334                                     (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 335                                 continue;
 336                         }
 337                         if (Wflag)
 338                                 printf("%-7.7s", name);
 339                         else
 340                                 printf("%-5.5s", name);
 341                         printf(" %5lu ", ifnet.if_mtu);
 342                         switch (sa->sa_family) {
 343                         case AF_UNSPEC:
 344                                 printf("%-13.13s ", "none");
 345                                 printf("%-15.15s ", "none");
 346                                 break;
 347                         case AF_INET:
 348                                 sockin = (struct sockaddr_in *)sa;
 349 #ifdef notdef
 350                                 /* can't use inet_makeaddr because kernel
 351                                  * keeps nets unshifted.
 352                                  */
 353                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 354                                         INADDR_ANY);
 355                                 printf("%-13.13s ", netname(in.s_addr,
 356                                     ifaddr.in.ia_subnetmask));
 357 #else
 358                                 printf("%-13.13s ",
 359                                     netname(htonl(ifaddr.in.ia_subnet),
 360                                     ifaddr.in.ia_subnetmask));
 361 #endif
 362                                 printf("%-17.17s ",
 363                                     routename(sockin->sin_addr.s_addr));
 364
 365                                 network_layer = 1;
 366                                 break;
 367 #ifdef INET6
 368                         case AF_INET6:
 369                                 sockin6 = (struct sockaddr_in6 *)sa;
 370                                 in6_fillscopeid(&ifaddr.in6.ia_addr);
 371                                 printf("%-13.13s ",
 372                                        netname6(&ifaddr.in6.ia_addr,
 373                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 374                                 in6_fillscopeid(sockin6);
 375                                 getnameinfo(sa, sa->sa_len, addr_buf,
 376                                     sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 377                                 printf("%-17.17s ", addr_buf);
 378
 379                                 network_layer = 1;
 380                                 break;
 381 #endif /*INET6*/
 382                         case AF_IPX:
 383                                 {
 384                                 struct sockaddr_ipx *sipx =
 385                                         (struct sockaddr_ipx *)sa;
 386                                 u_long net;
 387                                 char netnum[10];
 388
 389                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 390                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 391                                 printf("ipx:%-8s  ", netnum);
 392 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 393                                 printf("%-17s ",
 394                                     ipx_phost((struct sockaddr *)sipx));
 395                                 }
 396
 397                                 network_layer = 1;
 398                                 break;
 399
 400                         case AF_APPLETALK:
 401                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 402                                 printf("%-11.11s  ",atalk_print(sa,0x0b) );
 403                                 break;
 404                         case AF_LINK:
 405                                 {
 406                                 struct sockaddr_dl *sdl =
 407                                         (struct sockaddr_dl *)sa;
 408                                 char linknum[10];
 409                                 cp = (char *)LLADDR(sdl);
 410                                 n = sdl->sdl_alen;
 411                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 412                                 m = printf("%-13.13s ", linknum);
 413                                 }
 414                                 goto hexprint;
 415                         default:
 416                                 m = printf("(%d)", sa->sa_family);
 417                                 for (cp = sa->sa_len + (char *)sa;
 418                                         --cp > sa->sa_data && (*cp == 0);) {}
 419                                 n = cp - sa->sa_data + 1;
 420                                 cp = sa->sa_data;
 421                         hexprint:
 422                                 while ((--n >= 0) && (m < 30))
 423                                         m += printf("%02x%c", *cp++ & 0xff,
 424                                                     n > 0 ? ':' : ' ');
 425                                 m = 32 - m;
 426                                 while (m-- > 0)
 427                                         putchar(' ');
 428
 429                                 link_layer = 1;
 430                                 break;
 431                         }
 432
 433                         /*
 434                          * Fixup the statistics for interfaces that
 435                          * update stats for their network addresses
 436                          */
 437                         if (network_layer) {
 438                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 439                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 440                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 441                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 442                         }
 443
 444                         ifaddraddr = (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
 445                 }
 446
 447                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 448                 show_stat("lu", 5, ierrors, link_layer);
 449                 show_stat("lu", 5, idrops, link_layer);
 450                 if (bflag)
 451                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 452
 453                 show_stat("lu", 8, opackets, link_layer|network_layer);
 454                 show_stat("lu", 5, oerrors, link_layer);
 455                 if (bflag)
 456                         show_stat("lu", 10, obytes, link_layer|network_layer);
 457
 458                 show_stat("NRSlu", 5, collisions, link_layer);
 459                 if (dflag)
 460                         show_stat("LSd", 4, drops, link_layer);
 461                 putchar('\n');
 462
 463                 if (aflag && ifaddrfound) {
 464                         /*
 465                          * Print family's multicast addresses
 466                          */
 467                         struct ifmultiaddr *multiaddr;
 468                         struct ifmultiaddr ifma;
 469                         union {
 470                                 struct sockaddr sa;
 471                                 struct sockaddr_in in;
 472 #ifdef INET6
 473                                 struct sockaddr_in6 in6;
 474 #endif /* INET6 */
 475                                 struct sockaddr_dl dl;
 476                         } msa;
 477                         const char *fmt;
 478
 479                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 480                                 if (kread((u_long)multiaddr, (char *)&ifma,
 481                                           sizeof ifma) != 0)
 482                                         break;
 483                                 multiaddr = &ifma;
 484                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 485                                           sizeof msa) != 0)
 486                                         break;
 487                                 if (msa.sa.sa_family != sa->sa_family)
 488                                         continue;
 489
 490                                 fmt = 0;
 491                                 switch (msa.sa.sa_family) {
 492                                 case AF_INET:
 493                                         fmt = routename(msa.in.sin_addr.s_addr);
 494                                         break;
 495 #ifdef INET6
 496                                 case AF_INET6:
 497                                         in6_fillscopeid(&msa.in6);
 498                                         getnameinfo(&msa.sa, msa.sa.sa_len,
 499                                             addr_buf, sizeof(addr_buf), 0, 0,
 500                                             NI_NUMERICHOST);
 501                                         printf("%*s %-19.19s(refs: %d)\n",
 502                                                Wflag ? 27 : 25, "",
 503                                                addr_buf, ifma.ifma_refcount);
 504                                         break;
 505 #endif /* INET6 */
 506                                 case AF_LINK:
 507                                         switch (msa.dl.sdl_type) {
 508                                         case IFT_ETHER:
 509                                         case IFT_FDDI:
 510                                                 fmt = ether_ntoa(
 511                                                         (struct ether_addr *)
 512                                                         LLADDR(&msa.dl));
 513                                                 break;
 514                                         }
 515                                         break;
 516                                 }
 517                                 if (fmt) {
 518                                         printf("%*s %-17.17s",
 519                                             Wflag ? 27 : 25, "", fmt);
 520                                         if (msa.sa.sa_family == AF_LINK) {
 521                                                 printf(" %8lu", imcasts);
 522                                                 printf("%*s",
 523                                                     bflag ? 17 : 6, "");
 524                                                 printf(" %8lu", omcasts);
 525                                         }
 526                                         putchar('\n');
 527                                 }
 528                         }
 529                 }
 530         }
 531 }
 532
 533 struct  iftot {
 534         SLIST_ENTRY(iftot) chain;
 535         char    ift_name[IFNAMSIZ];     /* interface name */
 536         u_long  ift_ip;                 /* input packets */
 537         u_long  ift_ie;                 /* input errors */
 538         u_long  ift_id;                 /* input drops */
 539         u_long  ift_op;                 /* output packets */
 540         u_long  ift_oe;                 /* output errors */
 541         u_long  ift_co;                 /* collisions */
 542         u_int   ift_dr;                 /* drops */
 543         u_long  ift_ib;                 /* input bytes */
 544         u_long  ift_ob;                 /* output bytes */
 545 };
 546
 547 u_char  signalled;                      /* set if alarm goes off "early" */
 548
 549 /*
 550  * Print a running summary of interface statistics.
 551  * Repeat display every interval1 seconds, showing statistics
 552  * collected over that interval.  Assumes that interval1 is non-zero.
 553  * First line printed at top of screen is always cumulative.
 554  * XXX - should be rewritten to use ifmib(4).
 555  */
 556 static void
 557 sidewaysintpr(int interval1, u_long off)
 558 {
 559         struct ifnet ifnet;
 560         u_long firstifnet;
 561         struct ifnethead ifnethead;
 562         struct itimerval interval_it;
 563         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 564         int line;
 565         int oldmask, first;
 566         u_long interesting_off;
 567
 568         if (kread(off, (char *)&ifnethead, sizeof ifnethead) != 0)
 569                 return;
 570         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 571
 572         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 573                 printf("malloc failed\n");
 574                 exit(1);
 575         }
 576         memset(iftot, 0, sizeof(struct iftot));
 577
 578         interesting = NULL;
 579         interesting_off = 0;
 580         for (off = firstifnet, ip = iftot; off;) {
 581                 char name[IFNAMSIZ];
 582
 583                 if (kread(off, (char *)&ifnet, sizeof ifnet) != 0)
 584                         break;
 585                 strlcpy(name, ifnet.if_xname, sizeof(name));
 586                 if (interface && strcmp(name, interface) == 0) {
 587                         interesting = ip;
 588                         interesting_off = off;
 589                 }
 590                 snprintf(ip->ift_name, sizeof(ip->ift_name), "(%s)", name);
 591                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 592                         printf("malloc failed\n");
 593                         exit(1);
 594                 }
 595                 memset(ipn, 0, sizeof(struct iftot));
 596                 SLIST_NEXT(ip, chain) = ipn;
 597                 ip = ipn;
 598                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 599         }
 600         if (interface && interesting == NULL)
 601                 errx(1, "%s: unknown interface", interface);
 602         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 603                 printf("malloc failed\n");
 604                 exit(1);
 605         }
 606         memset(total, 0, sizeof(struct iftot));
 607         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 608                 printf("malloc failed\n");
 609                 exit(1);
 610         }
 611         memset(sum, 0, sizeof(struct iftot));
 612
 613         (void)signal(SIGALRM, catchalarm);
 614         signalled = NO;
 615         interval_it.it_interval.tv_sec = interval1;
 616         interval_it.it_interval.tv_usec = 0;
 617         interval_it.it_value = interval_it.it_interval;
 618         setitimer(ITIMER_REAL, &interval_it, NULL);
 619         first = 1;
 620 banner:
 621         printf("%17s %14s %16s", "input",
 622             interesting ? interesting->ift_name : "(Total)", "output");
 623         putchar('\n');
 624         printf("%10s %5s %5s %10s %10s %5s %10s %5s",
 625             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 626             "colls");
 627         if (dflag)
 628                 printf(" %5.5s", "drops");
 629         putchar('\n');
 630         fflush(stdout);
 631         line = 0;
 632 loop:
 633         if (interesting != NULL) {
 634                 ip = interesting;
 635                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet) != 0) {
 636                         printf("???\n");
 637                         exit(1);
 638                 };
 639                 if (!first) {
 640                         show_stat("lu", 10, ifnet.if_ipackets - ip->ift_ip, 1);
 641                         show_stat("lu", 5, ifnet.if_ierrors - ip->ift_ie, 1);
 642                         show_stat("lu", 5, ifnet.if_iqdrops - ip->ift_id, 1);
 643                         show_stat("lu", 10, ifnet.if_ibytes - ip->ift_ib, 1);
 644                         show_stat("lu", 10, ifnet.if_opackets - ip->ift_op, 1);
 645                         show_stat("lu", 5, ifnet.if_oerrors - ip->ift_oe, 1);
 646                         show_stat("lu", 10, ifnet.if_obytes - ip->ift_ob, 1);
 647                         show_stat("NRSlu", 5,
 648                             ifnet.if_collisions - ip->ift_co, 1);
 649                         if (dflag)
 650                                 show_stat("LSu", 5,
 651                                     ifnet.if_snd.ifq_drops - ip->ift_dr, 1);
 652                 }
 653                 ip->ift_ip = ifnet.if_ipackets;
 654                 ip->ift_ie = ifnet.if_ierrors;
 655                 ip->ift_id = ifnet.if_iqdrops;
 656                 ip->ift_ib = ifnet.if_ibytes;
 657                 ip->ift_op = ifnet.if_opackets;
 658                 ip->ift_oe = ifnet.if_oerrors;
 659                 ip->ift_ob = ifnet.if_obytes;
 660                 ip->ift_co = ifnet.if_collisions;
 661                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 662         } else {
 663                 sum->ift_ip = 0;
 664                 sum->ift_ie = 0;
 665                 sum->ift_id = 0;
 666                 sum->ift_ib = 0;
 667                 sum->ift_op = 0;
 668                 sum->ift_oe = 0;
 669                 sum->ift_ob = 0;
 670                 sum->ift_co = 0;
 671                 sum->ift_dr = 0;
 672                 for (off = firstifnet, ip = iftot;
 673                      off && SLIST_NEXT(ip, chain) != NULL;
 674                      ip = SLIST_NEXT(ip, chain)) {
 675                         if (kread(off, (char *)&ifnet, sizeof ifnet) != 0) {
 676                                 off = 0;
 677                                 continue;
 678                         }
 679                         sum->ift_ip += ifnet.if_ipackets;
 680                         sum->ift_ie += ifnet.if_ierrors;
 681                         sum->ift_id += ifnet.if_iqdrops;
 682                         sum->ift_ib += ifnet.if_ibytes;
 683                         sum->ift_op += ifnet.if_opackets;
 684                         sum->ift_oe += ifnet.if_oerrors;
 685                         sum->ift_ob += ifnet.if_obytes;
 686                         sum->ift_co += ifnet.if_collisions;
 687                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 688                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 689                 }
 690                 if (!first) {
 691                         show_stat("lu", 10, sum->ift_ip - total->ift_ip, 1);
 692                         show_stat("lu", 5, sum->ift_ie - total->ift_ie, 1);
 693                         show_stat("lu", 5, sum->ift_id - total->ift_id, 1);
 694                         show_stat("lu", 10, sum->ift_ib - total->ift_ib, 1);
 695                         show_stat("lu", 10, sum->ift_op - total->ift_op, 1);
 696                         show_stat("lu", 5, sum->ift_oe - total->ift_oe, 1);
 697                         show_stat("lu", 10, sum->ift_ob - total->ift_ob, 1);
 698                         show_stat("NRSlu", 5, sum->ift_co - total->ift_co, 1);
 699                         if (dflag)
 700                                 show_stat("LSu", 5,
 701                                     sum->ift_dr - total->ift_dr, 1);
 702                 }
 703                 *total = *sum;
 704         }
 705         if (!first)
 706                 putchar('\n');
 707         fflush(stdout);
 708         if ((noutputs != 0) && (--noutputs == 0))
 709                 exit(0);
 710         oldmask = sigblock(sigmask(SIGALRM));
 711         while (!signalled)
 712                 sigpause(0);
 713         signalled = NO;
 714         sigsetmask(oldmask);
 715         line++;
 716         first = 0;
 717         if (line == 21)
 718                 goto banner;
 719         else
 720                 goto loop;
 721         /*NOTREACHED*/
 722 }
 723
 724 /*
 725  * Set a flag to indicate that a signal from the periodic itimer has been
 726  * caught.
 727  */
 728 static void
 729 catchalarm(int signo __unused)
 730 {
 731         signalled = YES;
 732 }