usr.bin/netstat/if.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 2013 Gleb Smirnoff <glebius@FreeBSD.org>
   5  * Copyright (c) 1983, 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if 0
  34 #ifndef lint
  35 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  36 #endif /* not lint */
  37 #endif
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include <sys/param.h>
  43 #include <sys/protosw.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46 #include <sys/time.h>
  47
  48 #include <net/if.h>
  49 #include <net/if_dl.h>
  50 #include <net/if_types.h>
  51 #include <net/ethernet.h>
  52 #include <netinet/in.h>
  53 #include <netinet/in_var.h>
  54 #include <arpa/inet.h>
  55 #ifdef PF
  56 #include <net/pfvar.h>
  57 #include <net/if_pfsync.h>
  58 #endif
  59
  60 #include <err.h>
  61 #include <errno.h>
  62 #include <ifaddrs.h>
  63 #include <libutil.h>
  64 #ifdef INET6
  65 #include <netdb.h>
  66 #endif
  67 #include <signal.h>
  68 #include <stdbool.h>
  69 #include <stdint.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <sysexits.h>
  74 #include <unistd.h>
  75 #include <libxo/xo.h>
  76
  77 #include "netstat.h"
  78
  79 static void sidewaysintpr(void);
  80
  81 #ifdef PF
  82 static const char* pfsyncacts[] = {
  83         /* PFSYNC_ACT_CLR */            "clear all request",
  84         /* PFSYNC_ACT_INS_1301 */       "13.1 state insert",
  85         /* PFSYNC_ACT_INS_ACK */        "state inserted ack",
  86         /* PFSYNC_ACT_UPD_1301 */       "13.1 state update",
  87         /* PFSYNC_ACT_UPD_C */          "compressed state update",
  88         /* PFSYNC_ACT_UPD_REQ */        "uncompressed state request",
  89         /* PFSYNC_ACT_DEL */            "state delete",
  90         /* PFSYNC_ACT_DEL_C */          "compressed state delete",
  91         /* PFSYNC_ACT_INS_F */          "fragment insert",
  92         /* PFSYNC_ACT_DEL_F */          "fragment delete",
  93         /* PFSYNC_ACT_BUS */            "bulk update mark",
  94         /* PFSYNC_ACT_TDB */            "TDB replay counter update",
  95         /* PFSYNC_ACT_EOF */            "end of frame mark",
  96         /* PFSYNC_ACT_INS_1400 */       "state insert",
  97         /* PFSYNC_ACT_UPD_1400 */       "state update",
  98 };
  99
 100 static const char* pfsyncacts_name[] = {
 101         /* PFSYNC_ACT_CLR */            "clear-all-request",
 102         /* PFSYNC_ACT_INS_1301 */       "state-insert-1301",
 103         /* PFSYNC_ACT_INS_ACK */        "state-inserted-ack",
 104         /* PFSYNC_ACT_UPD_1301 */       "state-update-1301",
 105         /* PFSYNC_ACT_UPD_C */          "compressed-state-update",
 106         /* PFSYNC_ACT_UPD_REQ */        "uncompressed-state-request",
 107         /* PFSYNC_ACT_DEL */            "state-delete",
 108         /* PFSYNC_ACT_DEL_C */          "compressed-state-delete",
 109         /* PFSYNC_ACT_INS_F */          "fragment-insert",
 110         /* PFSYNC_ACT_DEL_F */          "fragment-delete",
 111         /* PFSYNC_ACT_BUS */            "bulk-update-mark",
 112         /* PFSYNC_ACT_TDB */            "TDB-replay-counter-update",
 113         /* PFSYNC_ACT_EOF */            "end-of-frame-mark",
 114         /* PFSYNC_ACT_INS_1400 */       "state-insert",
 115         /* PFSYNC_ACT_UPD_1400 */       "state-update",
 116 };
 117
 118 static void
 119 pfsync_acts_stats(const char *list, const char *desc, uint64_t *a)
 120 {
 121         int i;
 122
 123         xo_open_list(list);
 124         for (i = 0; i < PFSYNC_ACT_MAX; i++, a++) {
 125                 if (*a || sflag <= 1) {
 126                         xo_open_instance(list);
 127                         xo_emit("\t\t{e:name}{:count/%ju} {N:/%s%s %s}\n",
 128                             pfsyncacts_name[i], (uintmax_t)(*a),
 129                             pfsyncacts[i], plural(*a), desc);
 130                         xo_close_instance(list);
 131                 }
 132         }
 133         xo_close_list(list);
 134 }
 135
 136 /*
 137  * Dump pfsync statistics structure.
 138  */
 139 void
 140 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 141 {
 142         struct pfsyncstats pfsyncstat;
 143
 144         if (fetch_stats("net.pfsync.stats", off, &pfsyncstat,
 145             sizeof(pfsyncstat), kread) != 0)
 146                 return;
 147
 148         xo_emit("{T:/%s}:\n", name);
 149         xo_open_container(name);
 150
 151 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 152         xo_emit(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 153
 154         p(pfsyncs_ipackets, "\t{:received-inet-packets/%ju} "
 155             "{N:/packet%s received (IPv4)}\n");
 156         p(pfsyncs_ipackets6, "\t{:received-inet6-packets/%ju} "
 157             "{N:/packet%s received (IPv6)}\n");
 158         pfsync_acts_stats("input-histogram", "received",
 159             &pfsyncstat.pfsyncs_iacts[0]);
 160         p(pfsyncs_badif, "\t\t{:dropped-bad-interface/%ju} "
 161             "{N:/packet%s discarded for bad interface}\n");
 162         p(pfsyncs_badttl, "\t\t{:dropped-bad-ttl/%ju} "
 163             "{N:/packet%s discarded for bad ttl}\n");
 164         p(pfsyncs_hdrops, "\t\t{:dropped-short-header/%ju} "
 165             "{N:/packet%s shorter than header}\n");
 166         p(pfsyncs_badver, "\t\t{:dropped-bad-version/%ju} "
 167             "{N:/packet%s discarded for bad version}\n");
 168         p(pfsyncs_badauth, "\t\t{:dropped-bad-auth/%ju} "
 169             "{N:/packet%s discarded for bad HMAC}\n");
 170         p(pfsyncs_badact,"\t\t{:dropped-bad-action/%ju} "
 171             "{N:/packet%s discarded for bad action}\n");
 172         p(pfsyncs_badlen, "\t\t{:dropped-short/%ju} "
 173             "{N:/packet%s discarded for short packet}\n");
 174         p(pfsyncs_badval, "\t\t{:dropped-bad-values/%ju} "
 175             "{N:/state%s discarded for bad values}\n");
 176         p(pfsyncs_stale, "\t\t{:dropped-stale-state/%ju} "
 177             "{N:/stale state%s}\n");
 178         p(pfsyncs_badstate, "\t\t{:dropped-failed-lookup/%ju} "
 179             "{N:/failed state lookup\\/insert%s}\n");
 180         p(pfsyncs_opackets, "\t{:sent-inet-packets/%ju} "
 181             "{N:/packet%s sent (IPv4})\n");
 182         p(pfsyncs_opackets6, "\t{:send-inet6-packets/%ju} "
 183             "{N:/packet%s sent (IPv6})\n");
 184         pfsync_acts_stats("output-histogram", "sent",
 185             &pfsyncstat.pfsyncs_oacts[0]);
 186         p(pfsyncs_onomem, "\t\t{:discarded-no-memory/%ju} "
 187             "{N:/failure%s due to mbuf memory error}\n");
 188         p(pfsyncs_oerrors, "\t\t{:send-errors/%ju} "
 189             "{N:/send error%s}\n");
 190 #undef p
 191         xo_close_container(name);
 192 }
 193 #endif /* PF */
 194
 195 /*
 196  * Display a formatted value, or a '-' in the same space.
 197  */
 198 static void
 199 show_stat(const char *fmt, int width, const char *name,
 200     u_long value, short showvalue, int div1000)
 201 {
 202         const char *lsep, *rsep;
 203         char newfmt[64];
 204
 205         lsep = "";
 206         if (strncmp(fmt, "LS", 2) == 0) {
 207                 lsep = " ";
 208                 fmt += 2;
 209         }
 210         rsep = " ";
 211         if (strncmp(fmt, "NRS", 3) == 0) {
 212                 rsep = "";
 213                 fmt += 3;
 214         }
 215         if (showvalue == 0) {
 216                 /* Print just dash. */
 217                 xo_emit("{P:/%s}{D:/%*s}{P:/%s}", lsep, width, "-", rsep);
 218                 return;
 219         }
 220
 221         /*
 222          * XXX: workaround {P:} modifier can't be empty and doesn't seem to
 223          * take args... so we need to conditionally include it in the format.
 224          */
 225 #define maybe_pad(pad)  do {                                                \
 226         if (strlen(pad)) {                                                  \
 227                 snprintf(newfmt, sizeof(newfmt), "{P:%s}", pad);            \
 228                 xo_emit(newfmt);                                            \
 229         }                                                                   \
 230 } while (0)
 231
 232         if (hflag) {
 233                 char buf[5];
 234
 235                 /* Format in human readable form. */
 236                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 237                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL | \
 238                     ((div1000) ? HN_DIVISOR_1000 : 0));
 239                 maybe_pad(lsep);
 240                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%ds}", name, width);
 241                 xo_emit(newfmt, buf);
 242                 maybe_pad(rsep);
 243         } else {
 244                 /* Construct the format string. */
 245                 maybe_pad(lsep);
 246                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%d%s}",
 247                     name, width, fmt);
 248                 xo_emit(newfmt, value);
 249                 maybe_pad(rsep);
 250         }
 251 }
 252
 253 /*
 254  * Find next multiaddr for a given interface name.
 255  */
 256 static struct ifmaddrs *
 257 next_ifma(struct ifmaddrs *ifma, const char *name, const sa_family_t family)
 258 {
 259
 260         for(; ifma != NULL; ifma = ifma->ifma_next) {
 261                 struct sockaddr_dl *sdl;
 262
 263                 sdl = (struct sockaddr_dl *)ifma->ifma_name;
 264                 if (ifma->ifma_addr->sa_family == family &&
 265                     strcmp(sdl->sdl_data, name) == 0)
 266                         break;
 267         }
 268
 269         return (ifma);
 270 }
 271
 272 /*
 273  * Print a description of the network interfaces.
 274  */
 275 void
 276 intpr(void (*pfunc)(char *), int af)
 277 {
 278         struct ifaddrs *ifap, *ifa;
 279         struct ifmaddrs *ifmap, *ifma;
 280         u_int ifn_len_max = 5, ifn_len;
 281         u_int has_ipv6 = 0, net_len = 13, addr_len = 17;
 282
 283         if (interval)
 284                 return sidewaysintpr();
 285
 286         if (getifaddrs(&ifap) != 0)
 287                 err(EX_OSERR, "getifaddrs");
 288         if (aflag && getifmaddrs(&ifmap) != 0)
 289                 err(EX_OSERR, "getifmaddrs");
 290
 291         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 292                 if (interface != NULL &&
 293                     strcmp(ifa->ifa_name, interface) != 0)
 294                         continue;
 295                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 296                         continue;
 297                 ifn_len = strlen(ifa->ifa_name);
 298                 if ((ifa->ifa_flags & IFF_UP) == 0)
 299                         ++ifn_len;
 300                 ifn_len_max = MAX(ifn_len_max, ifn_len);
 301                 if (ifa->ifa_addr->sa_family == AF_INET6)
 302                         has_ipv6 = 1;
 303         }
 304         if (Wflag) {
 305                 if (has_ipv6) {
 306                         net_len = 24;
 307                         addr_len = 39;
 308                 } else
 309                         net_len = 18;
 310         }
 311
 312         xo_open_list("interface");
 313         if (!pfunc) {
 314                 xo_emit("{T:/%-*.*s}", ifn_len_max, ifn_len_max, "Name");
 315                 xo_emit(" {T:/%5.5s} {T:/%-*.*s} {T:/%-*.*s} {T:/%8.8s} "
 316                     "{T:/%5.5s} {T:/%5.5s}",
 317                     "Mtu", net_len, net_len, "Network", addr_len, addr_len,
 318                     "Address", "Ipkts", "Ierrs", "Idrop");
 319                 if (bflag)
 320                         xo_emit(" {T:/%10.10s}","Ibytes");
 321                 xo_emit(" {T:/%8.8s} {T:/%5.5s}", "Opkts", "Oerrs");
 322                 if (bflag)
 323                         xo_emit(" {T:/%10.10s}","Obytes");
 324                 xo_emit(" {T:/%5s}", "Coll");
 325                 if (dflag)
 326                         xo_emit(" {T:/%5.5s}", "Drop");
 327                 xo_emit("\n");
 328         }
 329
 330         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 331                 bool network = false, link = false;
 332                 char *name, *xname, buf[IFNAMSIZ+1];
 333                 const char *nn, *rn;
 334
 335                 if (interface != NULL && strcmp(ifa->ifa_name, interface) != 0)
 336                         continue;
 337
 338                 name = ifa->ifa_name;
 339
 340                 if (pfunc) {
 341
 342                         (*pfunc)(name);
 343
 344                         /*
 345                          * Skip all ifaddrs belonging to same interface.
 346                          */
 347                         while(ifa->ifa_next != NULL &&
 348                             (strcmp(ifa->ifa_next->ifa_name, name) == 0)) {
 349                                 ifa = ifa->ifa_next;
 350                         }
 351                         continue;
 352                 }
 353
 354                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 355                         continue;
 356
 357                 xo_open_instance("interface");
 358
 359                 if ((ifa->ifa_flags & IFF_UP) == 0) {
 360                         xname = stpcpy(buf, name);
 361                         *xname++ = '*';
 362                         *xname = '\0';
 363                         xname = buf;
 364                 } else
 365                         xname = name;
 366
 367                 xo_emit("{d:/%-*.*s}{etk:name}{eq:flags/0x%x}",
 368                     ifn_len_max, ifn_len_max, xname, name, ifa->ifa_flags);
 369
 370 #define IFA_MTU(ifa)    (((struct if_data *)(ifa)->ifa_data)->ifi_mtu)
 371                 show_stat("lu", 6, "mtu", IFA_MTU(ifa), IFA_MTU(ifa), 0);
 372 #undef IFA_MTU
 373
 374                 switch (ifa->ifa_addr->sa_family) {
 375                 case AF_UNSPEC:
 376                         xo_emit("{:network/%-*.*s} ", net_len, net_len,
 377                             "none");
 378                         xo_emit("{:address/%-*.*s} ", addr_len, addr_len,
 379                             "none");
 380                         break;
 381                 case AF_INET:
 382 #ifdef INET6
 383                 case AF_INET6:
 384 #endif /* INET6 */
 385                         nn = netname(ifa->ifa_addr, ifa->ifa_netmask);
 386                         rn = routename(ifa->ifa_addr, numeric_addr);
 387                         if (Wflag) {
 388                                 xo_emit("{t:network/%-*s} ", net_len, nn);
 389                                 xo_emit("{t:address/%-*s} ", addr_len, rn);
 390                         } else {
 391                                 xo_emit("{d:network/%-*.*s}{et:network} ",
 392                                     net_len, net_len, nn, nn);
 393                                 xo_emit("{d:address/%-*.*s}{et:address} ",
 394                                     addr_len, addr_len, rn, rn);
 395                         }
 396
 397                         network = true;
 398                         break;
 399                 case AF_LINK:
 400                     {
 401                         struct sockaddr_dl *sdl;
 402                         char linknum[sizeof("<Link#32767>")];
 403
 404                         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 405                         snprintf(linknum, sizeof(linknum), "<Link#%d>", sdl->sdl_index);
 406                         xo_emit("{t:network/%-*.*s} ", net_len, net_len,
 407                             linknum);
 408                         if (sdl->sdl_nlen == 0 &&
 409                             sdl->sdl_alen == 0 &&
 410                             sdl->sdl_slen == 0)
 411                                 xo_emit("{P:/%*s} ", addr_len, "");
 412                         else
 413                                 xo_emit("{t:address/%-*.*s} ", addr_len,
 414                                     addr_len, routename(ifa->ifa_addr, 1));
 415                         link = true;
 416                         break;
 417                     }
 418                 }
 419
 420 #define IFA_STAT(s)     (((struct if_data *)ifa->ifa_data)->ifi_ ## s)
 421                 show_stat("lu", 8, "received-packets", IFA_STAT(ipackets),
 422                     link|network, 1);
 423                 show_stat("lu", 5, "received-errors", IFA_STAT(ierrors),
 424                     link, 1);
 425                 show_stat("lu", 5, "dropped-packets", IFA_STAT(iqdrops),
 426                     link, 1);
 427                 if (bflag)
 428                         show_stat("lu", 10, "received-bytes", IFA_STAT(ibytes),
 429                             link|network, 0);
 430                 show_stat("lu", 8, "sent-packets", IFA_STAT(opackets),
 431                     link|network, 1);
 432                 show_stat("lu", 5, "send-errors", IFA_STAT(oerrors), link, 1);
 433                 if (bflag)
 434                         show_stat("lu", 10, "sent-bytes", IFA_STAT(obytes),
 435                             link|network, 0);
 436                 show_stat("NRSlu", 5, "collisions", IFA_STAT(collisions),
 437                     link, 1);
 438                 if (dflag)
 439                         show_stat("LSlu", 5, "dropped-packets",
 440                             IFA_STAT(oqdrops), link, 1);
 441                 xo_emit("\n");
 442
 443                 if (!aflag) {
 444                         xo_close_instance("interface");
 445                         continue;
 446                 }
 447
 448                 /*
 449                  * Print family's multicast addresses.
 450                  */
 451                 xo_open_list("multicast-address");
 452                 for (ifma = next_ifma(ifmap, ifa->ifa_name,
 453                     ifa->ifa_addr->sa_family);
 454                     ifma != NULL;
 455                     ifma = next_ifma(ifma, ifa->ifa_name,
 456                     ifa->ifa_addr->sa_family)) {
 457                         const char *fmt = NULL;
 458
 459                         xo_open_instance("multicast-address");
 460                         switch (ifma->ifma_addr->sa_family) {
 461                         case AF_LINK:
 462                             {
 463                                 struct sockaddr_dl *sdl;
 464
 465                                 sdl = (struct sockaddr_dl *)ifma->ifma_addr;
 466                                 if (sdl->sdl_type != IFT_ETHER &&
 467                                     sdl->sdl_type != IFT_FDDI)
 468                                         break;
 469                             }
 470                                 /* FALLTHROUGH */
 471                         case AF_INET:
 472 #ifdef INET6
 473                         case AF_INET6:
 474 #endif /* INET6 */
 475                                 fmt = routename(ifma->ifma_addr, numeric_addr);
 476                                 break;
 477                         }
 478                         if (fmt) {
 479                                 if (Wflag)
 480                                         xo_emit("{P:/%27s }"
 481                                             "{t:address/%-17s/}", "", fmt);
 482                                 else
 483                                         xo_emit("{P:/%25s }"
 484                                             "{t:address/%-17.17s/}", "", fmt);
 485                                 if (ifma->ifma_addr->sa_family == AF_LINK) {
 486                                         xo_emit(" {:received-packets/%8lu}",
 487                                             IFA_STAT(imcasts));
 488                                         xo_emit("{P:/%*s}", bflag? 17 : 6, "");
 489                                         xo_emit(" {:sent-packets/%8lu}",
 490                                             IFA_STAT(omcasts));
 491                                 }
 492                                 xo_emit("\n");
 493                         }
 494                         xo_close_instance("multicast-address");
 495                         ifma = ifma->ifma_next;
 496                 }
 497                 xo_close_list("multicast-address");
 498                 xo_close_instance("interface");
 499         }
 500         xo_close_list("interface");
 501
 502         freeifaddrs(ifap);
 503         if (aflag)
 504                 freeifmaddrs(ifmap);
 505 }
 506
 507 struct iftot {
 508         u_long  ift_ip;                 /* input packets */
 509         u_long  ift_ie;                 /* input errors */
 510         u_long  ift_id;                 /* input drops */
 511         u_long  ift_op;                 /* output packets */
 512         u_long  ift_oe;                 /* output errors */
 513         u_long  ift_od;                 /* output drops */
 514         u_long  ift_co;                 /* collisions */
 515         u_long  ift_ib;                 /* input bytes */
 516         u_long  ift_ob;                 /* output bytes */
 517 };
 518
 519 /*
 520  * Obtain stats for interface(s).
 521  */
 522 static void
 523 fill_iftot(struct iftot *st)
 524 {
 525         struct ifaddrs *ifap, *ifa;
 526         bool found = false;
 527
 528         if (getifaddrs(&ifap) != 0)
 529                 xo_err(EX_OSERR, "getifaddrs");
 530
 531         bzero(st, sizeof(*st));
 532
 533         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 534                 if (ifa->ifa_addr->sa_family != AF_LINK)
 535                         continue;
 536                 if (interface) {
 537                         if (strcmp(ifa->ifa_name, interface) == 0)
 538                                 found = true;
 539                         else
 540                                 continue;
 541                 }
 542
 543                 st->ift_ip += IFA_STAT(ipackets);
 544                 st->ift_ie += IFA_STAT(ierrors);
 545                 st->ift_id += IFA_STAT(iqdrops);
 546                 st->ift_ib += IFA_STAT(ibytes);
 547                 st->ift_op += IFA_STAT(opackets);
 548                 st->ift_oe += IFA_STAT(oerrors);
 549                 st->ift_od += IFA_STAT(oqdrops);
 550                 st->ift_ob += IFA_STAT(obytes);
 551                 st->ift_co += IFA_STAT(collisions);
 552         }
 553
 554         if (interface && found == false)
 555                 xo_err(EX_DATAERR, "interface %s not found", interface);
 556
 557         freeifaddrs(ifap);
 558 }
 559
 560 /*
 561  * Set a flag to indicate that a signal from the periodic itimer has been
 562  * caught.
 563  */
 564 static sig_atomic_t signalled;
 565 static void
 566 catchalarm(int signo __unused)
 567 {
 568         signalled = true;
 569 }
 570
 571 /*
 572  * Print a running summary of interface statistics.
 573  * Repeat display every interval seconds, showing statistics
 574  * collected over that interval.  Assumes that interval is non-zero.
 575  * First line printed at top of screen is always cumulative.
 576  */
 577 static void
 578 sidewaysintpr(void)
 579 {
 580         struct iftot ift[2], *new, *old;
 581         struct itimerval interval_it;
 582         int oldmask, line;
 583
 584         new = &ift[0];
 585         old = &ift[1];
 586         fill_iftot(old);
 587
 588         (void)signal(SIGALRM, catchalarm);
 589         signalled = false;
 590         interval_it.it_interval.tv_sec = interval;
 591         interval_it.it_interval.tv_usec = 0;
 592         interval_it.it_value = interval_it.it_interval;
 593         setitimer(ITIMER_REAL, &interval_it, NULL);
 594         xo_open_list("interface-statistics");
 595
 596 banner:
 597         xo_emit("{T:/%17s} {T:/%14s} {T:/%16s}\n", "input",
 598             interface != NULL ? interface : "(Total)", "output");
 599         xo_emit("{T:/%10s} {T:/%5s} {T:/%5s} {T:/%10s} {T:/%10s} {T:/%5s} "
 600             "{T:/%10s} {T:/%5s}",
 601             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 602             "colls");
 603         if (dflag)
 604                 xo_emit(" {T:/%5.5s}", "drops");
 605         xo_emit("\n");
 606         xo_flush();
 607         line = 0;
 608
 609 loop:
 610         if ((noutputs != 0) && (--noutputs == 0)) {
 611                 xo_close_list("interface-statistics");
 612                 return;
 613         }
 614         oldmask = sigblock(sigmask(SIGALRM));
 615         while (!signalled)
 616                 sigpause(0);
 617         signalled = false;
 618         sigsetmask(oldmask);
 619         line++;
 620
 621         fill_iftot(new);
 622
 623         xo_open_instance("stats");
 624         show_stat("lu", 10, "received-packets",
 625             new->ift_ip - old->ift_ip, 1, 1);
 626         show_stat("lu", 5, "received-errors",
 627             new->ift_ie - old->ift_ie, 1, 1);
 628         show_stat("lu", 5, "dropped-packets",
 629             new->ift_id - old->ift_id, 1, 1);
 630         show_stat("lu", 10, "received-bytes",
 631             new->ift_ib - old->ift_ib, 1, 0);
 632         show_stat("lu", 10, "sent-packets",
 633             new->ift_op - old->ift_op, 1, 1);
 634         show_stat("lu", 5, "send-errors",
 635             new->ift_oe - old->ift_oe, 1, 1);
 636         show_stat("lu", 10, "sent-bytes",
 637             new->ift_ob - old->ift_ob, 1, 0);
 638         show_stat("NRSlu", 5, "collisions",
 639             new->ift_co - old->ift_co, 1, 1);
 640         if (dflag)
 641                 show_stat("LSlu", 5, "dropped-packets",
 642                     new->ift_od - old->ift_od, 1, 1);
 643         xo_close_instance("stats");
 644         xo_emit("\n");
 645         xo_flush();
 646
 647         if (new == &ift[0]) {
 648                 new = &ift[1];
 649                 old = &ift[0];
 650         } else {
 651                 new = &ift[0];
 652                 old = &ift[1];
 653         }
 654
 655         if (line == 21)
 656                 goto banner;
 657         else
 658                 goto loop;
 659
 660         /* NOTREACHED */
 661 }