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  * @(#)if.c     8.3 (Berkeley) 4/28/95
  34  * $FreeBSD: src/usr.bin/netstat/if.c,v 1.32.2.9 2001/09/17 14:35:46 ru Exp $
  35  * $DragonFly: src/usr.bin/netstat/if.c,v 1.12 2008/03/07 11:34:21 sephe Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/protosw.h>
  40 #include <sys/socket.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/time.h>
  43
  44 #include <net/if.h>
  45 #include <net/if_var.h>
  46 #include <net/if_dl.h>
  47 #include <net/if_types.h>
  48 #include <net/ethernet.h>
  49 #include <netinet/in.h>
  50 #include <netinet/in_var.h>
  51 #include <netproto/ipx/ipx.h>
  52 #include <netproto/ipx/ipx_if.h>
  53 #ifdef NS
  54 #include <netproto/ns/ns.h>
  55 #include <netproto/ns/ns_if.h>
  56 #endif
  57 #ifdef ISO
  58 #include <netiso/iso.h>
  59 #include <netiso/iso_var.h>
  60 #endif
  61 #include <arpa/inet.h>
  62
  63 #include <signal.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68
  69 #include "netstat.h"
  70
  71 #define YES     1
  72 #define NO      0
  73
  74 static void sidewaysintpr (u_int, u_long);
  75 static void catchalarm (int);
  76
  77 #ifdef INET6
  78 char *netname6 (struct sockaddr_in6 *, struct in6_addr *);
  79 static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
  80 #endif
  81
  82
  83 /*
  84  * Display a formatted value, or a '-' in the same space.
  85  */
  86 static void
  87 show_stat(const char *fmt, int width, u_long value, short showvalue)
  88 {
  89         char newfmt[32];
  90
  91         /* Construct the format string */
  92         if (showvalue) {
  93                 sprintf(newfmt, "%%%d%s", width, fmt);
  94                 printf(newfmt, value);
  95         } else {
  96                 sprintf(newfmt, "%%%ds", width);
  97                 printf(newfmt, "-");
  98         }
  99 }
 100
 101
 102
 103 /*
 104  * Print a description of the network interfaces.
 105  */
 106 void
 107 intpr(int interval, u_long ifnetaddr, void (*pfunc)(char *))
 108 {
 109         struct ifnet ifnet;
 110         struct ifaddr_container ifac;
 111         struct ifnethead ifnethead;
 112         union {
 113                 struct ifaddr ifa;
 114                 struct in_ifaddr in;
 115 #ifdef INET6
 116                 struct in6_ifaddr in6;
 117 #endif
 118                 struct ipx_ifaddr ipx;
 119 #ifdef NS
 120                 struct ns_ifaddr ns;
 121 #endif
 122 #ifdef ISO
 123                 struct iso_ifaddr iso;
 124 #endif
 125         } ifaddr;
 126         u_long ifaddraddr;
 127         u_long ifaddrcont_addr;
 128         u_long ifaddrfound;
 129         u_long ifnetfound;
 130         u_long opackets;
 131         u_long ipackets;
 132         u_long obytes;
 133         u_long ibytes;
 134         u_long oerrors;
 135         u_long ierrors;
 136         u_long collisions;
 137         short timer;
 138         int drops;
 139         struct sockaddr *sa = NULL;
 140         char name[IFNAMSIZ];
 141         short network_layer;
 142         short link_layer;
 143
 144         if (ifnetaddr == 0) {
 145                 printf("ifnet: symbol not defined\n");
 146                 return;
 147         }
 148         if (interval) {
 149                 sidewaysintpr((unsigned)interval, ifnetaddr);
 150                 return;
 151         }
 152         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead))
 153                 return;
 154         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 155         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 156                 return;
 157
 158         if (!pfunc) {
 159                 printf("%-7.7s %-5.5s %-13.13s %-15.15s %8.8s %5.5s",
 160                        "Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs");
 161                 if (bflag)
 162                         printf(" %10.10s","Ibytes");
 163                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 164                 if (bflag)
 165                         printf(" %10.10s","Obytes");
 166                 printf(" %5s", "Coll");
 167                 if (tflag)
 168                         printf(" %s", "Time");
 169                 if (dflag)
 170                         printf(" %s", "Drop");
 171                 putchar('\n');
 172         }
 173         ifaddraddr = 0;
 174         while (ifnetaddr || ifaddraddr) {
 175                 struct sockaddr_in *sin;
 176 #ifdef INET6
 177                 struct sockaddr_in6 *sin6;
 178 #endif
 179                 char *cp;
 180                 int n, m;
 181
 182                 network_layer = 0;
 183                 link_layer = 0;
 184
 185                 if (ifaddraddr == 0) {
 186                         struct ifaddrhead head;
 187
 188                         ifnetfound = ifnetaddr;
 189                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 190                                 return;
 191                         strlcpy(name, ifnet.if_xname, sizeof(name));
 192                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 193                         if (interface != 0 && (strcmp(name, interface) != 0))
 194                                 continue;
 195                         cp = strchr(name, '\0');
 196
 197                         if (pfunc) {
 198                                 (*pfunc)(name);
 199                                 continue;
 200                         }
 201
 202                         if ((ifnet.if_flags&IFF_UP) == 0)
 203                                 *cp++ = '*';
 204                         *cp = '\0';
 205
 206                         if (kread((u_long)ifnet.if_addrheads,
 207                                   (char *)&head, sizeof(head)))
 208                                 return;
 209
 210                         ifaddrcont_addr =
 211                                 (u_long)TAILQ_FIRST(&head);
 212                         if (ifaddrcont_addr == 0) {
 213                                 ifaddraddr = 0;
 214                         } else {
 215                                 if (kread(ifaddrcont_addr, (char *)&ifac,
 216                                           sizeof(ifac)))
 217                                         return;
 218                                 ifaddraddr = (u_long)ifac.ifa;
 219                         }
 220                 }
 221                 ifaddrfound = ifaddraddr;
 222
 223                 /*
 224                  * Get the interface stats.  These may get
 225                  * overriden below on a per-interface basis.
 226                  */
 227                 opackets = ifnet.if_opackets;
 228                 ipackets = ifnet.if_ipackets;
 229                 obytes = ifnet.if_obytes;
 230                 ibytes = ifnet.if_ibytes;
 231                 oerrors = ifnet.if_oerrors;
 232                 ierrors = ifnet.if_ierrors;
 233                 collisions = ifnet.if_collisions;
 234                 timer = ifnet.if_timer;
 235                 drops = ifnet.if_snd.ifq_drops;
 236
 237                 if (ifaddraddr == 0) {
 238                         printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
 239                         printf("%-13.13s ", "none");
 240                         printf("%-15.15s ", "none");
 241                 } else {
 242                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
 243                                 ifaddraddr = 0;
 244                                 continue;
 245                         }
 246 #define CP(x) ((char *)(x))
 247                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 248                                 CP(&ifaddr);
 249                         sa = (struct sockaddr *)cp;
 250                         if (af != AF_UNSPEC && sa->sa_family != af) {
 251                                 ifaddrcont_addr =
 252                                         (u_long)TAILQ_NEXT(&ifac, ifa_link);
 253                                 if (ifaddrcont_addr == 0) {
 254                                         ifaddraddr = 0;
 255                                 } else {
 256                                         if (kread(ifaddrcont_addr,
 257                                             (char *)&ifac, sizeof(ifac))) {
 258                                                 ifaddraddr = 0;
 259                                                 continue;
 260                                         }
 261                                         ifaddraddr = (u_long)ifac.ifa;
 262                                 }
 263                                 continue;
 264                         }
 265                         printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
 266                         switch (sa->sa_family) {
 267                         case AF_UNSPEC:
 268                                 printf("%-13.13s ", "none");
 269                                 printf("%-15.15s ", "none");
 270                                 break;
 271                         case AF_INET:
 272                                 sin = (struct sockaddr_in *)sa;
 273 #ifdef notdef
 274                                 /* can't use inet_makeaddr because kernel
 275                                  * keeps nets unshifted.
 276                                  */
 277                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 278                                         INADDR_ANY);
 279                                 printf("%-13.13s ", netname(in.s_addr,
 280                                     ifaddr.in.ia_subnetmask));
 281 #else
 282                                 printf("%-13.13s ",
 283                                     netname(htonl(ifaddr.in.ia_subnet),
 284                                     ifaddr.in.ia_subnetmask));
 285 #endif
 286                                 printf("%-15.15s ",
 287                                     routename(sin->sin_addr.s_addr));
 288
 289                                 network_layer = 1;
 290                                 break;
 291 #ifdef INET6
 292                         case AF_INET6:
 293                                 sin6 = (struct sockaddr_in6 *)sa;
 294                                 printf("%-11.11s ",
 295                                        netname6(&ifaddr.in6.ia_addr,
 296                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 297                                 printf("%-17.17s ",
 298                                     (char *)inet_ntop(AF_INET6,
 299                                         &sin6->sin6_addr,
 300                                         ntop_buf, sizeof(ntop_buf)));
 301
 302                                 network_layer = 1;
 303                                 break;
 304 #endif /*INET6*/
 305                         case AF_IPX:
 306                                 {
 307                                 struct sockaddr_ipx *sipx =
 308                                         (struct sockaddr_ipx *)sa;
 309                                 u_long net;
 310                                 char netnum[10];
 311
 312                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 313                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 314                                 printf("ipx:%-8s  ", netnum);
 315 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 316                                 printf("%-15s ",
 317                                     ipx_phost((struct sockaddr *)sipx));
 318                                 }
 319                                 break;
 320
 321                         case AF_APPLETALK:
 322                                 printf("atalk:%-12.12s ",atalk_print(sa,0x10) );
 323                                 printf("%-9.9s  ",atalk_print(sa,0x0b) );
 324                                 break;
 325 #ifdef NS
 326                         case AF_NS:
 327                                 {
 328                                 struct sockaddr_ns *sns =
 329                                         (struct sockaddr_ns *)sa;
 330                                 u_long net;
 331                                 char netnum[10];
 332
 333                                 *(union ns_net *) &net = sns->sns_addr.x_net;
 334                                 sprintf(netnum, "%lxH", ntohl(net));
 335                                 upHex(netnum);
 336                                 printf("ns:%-8s ", netnum);
 337                                 printf("%-15s ",
 338                                     ns_phost((struct sockaddr *)sns));
 339                                 }
 340                                 break;
 341 #endif
 342                         case AF_LINK:
 343                                 {
 344                                 struct sockaddr_dl *sdl =
 345                                         (struct sockaddr_dl *)sa;
 346                                 char linknum[10];
 347                                 cp = (char *)LLADDR(sdl);
 348                                 n = sdl->sdl_alen;
 349                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 350                                 m = printf("%-11.11s ", linknum);
 351                                 }
 352                                 goto hexprint;
 353                         default:
 354                                 m = printf("(%d)", sa->sa_family);
 355                                 for (cp = sa->sa_len + (char *)sa;
 356                                         --cp > sa->sa_data && (*cp == 0);) {}
 357                                 n = cp - sa->sa_data + 1;
 358                                 cp = sa->sa_data;
 359                         hexprint:
 360                                 while (--n >= 0)
 361                                         m += printf("%02x%c", *cp++ & 0xff,
 362                                                     n > 0 ? ':' : ' ');
 363                                 m = 30 - m;
 364                                 while (m-- > 0)
 365                                         putchar(' ');
 366
 367                                 link_layer = 1;
 368                                 break;
 369                         }
 370
 371                         /*
 372                          * Fixup the statistics for interfaces that
 373                          * update stats for their network addresses
 374                          */
 375                         if (network_layer) {
 376                                 opackets = ifaddr.in.ia_ifa.if_opackets;
 377                                 ipackets = ifaddr.in.ia_ifa.if_ipackets;
 378                                 obytes = ifaddr.in.ia_ifa.if_obytes;
 379                                 ibytes = ifaddr.in.ia_ifa.if_ibytes;
 380                         }
 381
 382                         ifaddrcont_addr =
 383                                 (u_long)TAILQ_NEXT(&ifac, ifa_link);
 384                         if (ifaddrcont_addr == 0) {
 385                                 ifaddraddr = 0;
 386                         } else {
 387                                 if (kread(ifaddrcont_addr,
 388                                     (char *)&ifac, sizeof(ifac))) {
 389                                         ifaddraddr = 0;
 390                                 } else {
 391                                         ifaddraddr = (u_long)ifac.ifa;
 392                                 }
 393                         }
 394                 }
 395
 396                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 397                 printf(" ");
 398                 show_stat("lu", 5, ierrors, link_layer);
 399                 printf(" ");
 400                 if (bflag) {
 401                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 402                         printf(" ");
 403                 }
 404                 show_stat("lu", 8, opackets, link_layer|network_layer);
 405                 printf(" ");
 406                 show_stat("lu", 5, oerrors, link_layer);
 407                 printf(" ");
 408                 if (bflag) {
 409                         show_stat("lu", 10, obytes, link_layer|network_layer);
 410                         printf(" ");
 411                 }
 412                 show_stat("lu", 5, collisions, link_layer);
 413                 if (tflag) {
 414                         printf(" ");
 415                         show_stat("d", 3, timer, link_layer);
 416                 }
 417                 if (dflag) {
 418                         printf(" ");
 419                         show_stat("d", 3, drops, link_layer);
 420                 }
 421                 putchar('\n');
 422                 if (aflag && ifaddrfound) {
 423                         /*
 424                          * Print family's multicast addresses
 425                          */
 426                         u_long multiaddr;
 427                         struct ifmultiaddr ifma;
 428                         union {
 429                                 struct sockaddr sa;
 430                                 struct sockaddr_in in;
 431 #ifdef INET6
 432                                 struct sockaddr_in6 in6;
 433 #endif /* INET6 */
 434                                 struct sockaddr_dl dl;
 435                         } msa;
 436                         const char *fmt;
 437
 438                         for(multiaddr = (u_long)ifnet.if_multiaddrs.lh_first;
 439                             multiaddr;
 440                             multiaddr = (u_long)ifma.ifma_link.le_next) {
 441                                 if (kread(multiaddr, (char *)&ifma,
 442                                           sizeof ifma))
 443                                         break;
 444                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 445                                           sizeof msa))
 446                                         break;
 447                                 if (msa.sa.sa_family != sa->sa_family)
 448                                         continue;
 449
 450                                 fmt = 0;
 451                                 switch (msa.sa.sa_family) {
 452                                 case AF_INET:
 453                                         fmt = routename(msa.in.sin_addr.s_addr);
 454                                         break;
 455 #ifdef INET6
 456                                 case AF_INET6:
 457                                         printf("%23s %-19.19s(refs: %d)\n", "",
 458                                                inet_ntop(AF_INET6,
 459                                                          &msa.in6.sin6_addr,
 460                                                          ntop_buf,
 461                                                          sizeof(ntop_buf)),
 462                                                ifma.ifma_refcount);
 463                                         break;
 464 #endif /* INET6 */
 465                                 case AF_LINK:
 466                                         switch (msa.dl.sdl_type) {
 467                                         case IFT_ETHER:
 468                                         case IFT_FDDI:
 469                                                 fmt = ether_ntoa(
 470                                                         (struct ether_addr *)
 471                                                         LLADDR(&msa.dl));
 472                                                 break;
 473                                         }
 474                                         break;
 475                                 }
 476                                 if (fmt)
 477                                         printf("%23s %s\n", "", fmt);
 478                         }
 479                 }
 480         }
 481 }
 482
 483 struct  iftot {
 484         SLIST_ENTRY(iftot) chain;
 485         char    ift_name[IFNAMSIZ];     /* interface name */
 486         u_long  ift_ip;                 /* input packets */
 487         u_long  ift_ie;                 /* input errors */
 488         u_long  ift_op;                 /* output packets */
 489         u_long  ift_oe;                 /* output errors */
 490         u_long  ift_co;                 /* collisions */
 491         u_int   ift_dr;                 /* drops */
 492         u_long  ift_ib;                 /* input bytes */
 493         u_long  ift_ob;                 /* output bytes */
 494 };
 495
 496 u_char  signalled;                      /* set if alarm goes off "early" */
 497
 498 /*
 499  * Print a running summary of interface statistics.
 500  * Repeat display every interval seconds, showing statistics
 501  * collected over that interval.  Assumes that interval is non-zero.
 502  * First line printed at top of screen is always cumulative.
 503  * XXX - should be rewritten to use ifmib(4).
 504  */
 505 static void
 506 sidewaysintpr(unsigned interval, u_long off)
 507 {
 508         struct ifnet ifnet;
 509         u_long firstifnet;
 510         struct ifnethead ifnethead;
 511         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 512         int line;
 513         int oldmask, first;
 514         u_long interesting_off;
 515
 516         if (kread(off, (char *)&ifnethead, sizeof ifnethead))
 517                 return;
 518         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 519
 520         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 521                 printf("malloc failed\n");
 522                 exit(1);
 523         }
 524         memset(iftot, 0, sizeof(struct iftot));
 525
 526         interesting = NULL;
 527         interesting_off = 0;
 528         for (off = firstifnet, ip = iftot; off;) {
 529                 char name[IFNAMSIZ];
 530
 531                 if (kread(off, (char *)&ifnet, sizeof ifnet))
 532                         break;
 533                 strlcpy(name, ifnet.if_xname, sizeof(name));
 534                 if (interface && strcmp(name, interface) == 0) {
 535                         interesting = ip;
 536                         interesting_off = off;
 537                 }
 538                 snprintf(ip->ift_name, 16, "(%s)", name);
 539                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 540                         printf("malloc failed\n");
 541                         exit(1);
 542                 }
 543                 memset(ipn, 0, sizeof(struct iftot));
 544                 SLIST_NEXT(ip, chain) = ipn;
 545                 ip = ipn;
 546                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 547         }
 548         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 549                 printf("malloc failed\n");
 550                 exit(1);
 551         }
 552         memset(total, 0, sizeof(struct iftot));
 553         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 554                 printf("malloc failed\n");
 555                 exit(1);
 556         }
 557         memset(sum, 0, sizeof(struct iftot));
 558
 559
 560         (void)signal(SIGALRM, catchalarm);
 561         signalled = NO;
 562         (void)alarm(interval);
 563         first = 1;
 564 banner:
 565         printf("%17s %14s %16s", "input",
 566             interesting ? interesting->ift_name : "(Total)", "output");
 567         putchar('\n');
 568         printf("%10s %5s %10s %10s %5s %10s %5s",
 569             "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
 570         if (dflag)
 571                 printf(" %5.5s", "drops");
 572         putchar('\n');
 573         fflush(stdout);
 574         line = 0;
 575 loop:
 576         if (interesting != NULL) {
 577                 ip = interesting;
 578                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet)) {
 579                         printf("???\n");
 580                         exit(1);
 581                 };
 582                 if (!first) {
 583                         printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
 584                                 ifnet.if_ipackets - ip->ift_ip,
 585                                 ifnet.if_ierrors - ip->ift_ie,
 586                                 ifnet.if_ibytes - ip->ift_ib,
 587                                 ifnet.if_opackets - ip->ift_op,
 588                                 ifnet.if_oerrors - ip->ift_oe,
 589                                 ifnet.if_obytes - ip->ift_ob,
 590                                 ifnet.if_collisions - ip->ift_co);
 591                         if (dflag)
 592                                 printf(" %5u", ifnet.if_snd.ifq_drops - ip->ift_dr);
 593                 }
 594                 ip->ift_ip = ifnet.if_ipackets;
 595                 ip->ift_ie = ifnet.if_ierrors;
 596                 ip->ift_ib = ifnet.if_ibytes;
 597                 ip->ift_op = ifnet.if_opackets;
 598                 ip->ift_oe = ifnet.if_oerrors;
 599                 ip->ift_ob = ifnet.if_obytes;
 600                 ip->ift_co = ifnet.if_collisions;
 601                 ip->ift_dr = ifnet.if_snd.ifq_drops;
 602         } else {
 603                 sum->ift_ip = 0;
 604                 sum->ift_ie = 0;
 605                 sum->ift_ib = 0;
 606                 sum->ift_op = 0;
 607                 sum->ift_oe = 0;
 608                 sum->ift_ob = 0;
 609                 sum->ift_co = 0;
 610                 sum->ift_dr = 0;
 611                 for (off = firstifnet, ip = iftot;
 612                      off && SLIST_NEXT(ip, chain) != NULL;
 613                      ip = SLIST_NEXT(ip, chain)) {
 614                         if (kread(off, (char *)&ifnet, sizeof ifnet)) {
 615                                 off = 0;
 616                                 continue;
 617                         }
 618                         sum->ift_ip += ifnet.if_ipackets;
 619                         sum->ift_ie += ifnet.if_ierrors;
 620                         sum->ift_ib += ifnet.if_ibytes;
 621                         sum->ift_op += ifnet.if_opackets;
 622                         sum->ift_oe += ifnet.if_oerrors;
 623                         sum->ift_ob += ifnet.if_obytes;
 624                         sum->ift_co += ifnet.if_collisions;
 625                         sum->ift_dr += ifnet.if_snd.ifq_drops;
 626                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 627                 }
 628                 if (!first) {
 629                         printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
 630                                 sum->ift_ip - total->ift_ip,
 631                                 sum->ift_ie - total->ift_ie,
 632                                 sum->ift_ib - total->ift_ib,
 633                                 sum->ift_op - total->ift_op,
 634                                 sum->ift_oe - total->ift_oe,
 635                                 sum->ift_ob - total->ift_ob,
 636                                 sum->ift_co - total->ift_co);
 637                         if (dflag)
 638                                 printf(" %5u", sum->ift_dr - total->ift_dr);
 639                 }
 640                 *total = *sum;
 641         }
 642         if (!first)
 643                 putchar('\n');
 644         fflush(stdout);
 645         oldmask = sigblock(sigmask(SIGALRM));
 646         if (! signalled) {
 647                 sigpause(0);
 648         }
 649         sigsetmask(oldmask);
 650         signalled = NO;
 651         (void)alarm(interval);
 652         line++;
 653         first = 0;
 654         if (line == 21)
 655                 goto banner;
 656         else
 657                 goto loop;
 658         /*NOTREACHED*/
 659 }
 660
 661 /*
 662  * Called if an interval expires before sidewaysintpr has completed a loop.
 663  * Sets a flag to not wait for the alarm.
 664  */
 665 static void
 666 catchalarm(int signo __unused)
 667 {
 668         signalled = YES;
 669 }