usr.bin/netstat/if.c

   1 /*-
   2  * Copyright (c) 2013 Gleb Smirnoff <glebius@FreeBSD.org>
   3  * Copyright (c) 1983, 1988, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #if 0
  32 #ifndef lint
  33 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  34 #endif /* not lint */
  35 #endif
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <sys/types.h>
  41 #include <sys/protosw.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/time.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_var.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(int);
  80
  81 #ifdef INET6
  82 static char addr_buf[NI_MAXHOST];               /* for getnameinfo() */
  83 #endif
  84
  85 #ifdef PF
  86 static const char* pfsyncacts[] = {
  87         /* PFSYNC_ACT_CLR */            "clear all request",
  88         /* PFSYNC_ACT_INS */            "state insert",
  89         /* PFSYNC_ACT_INS_ACK */        "state inserted ack",
  90         /* PFSYNC_ACT_UPD */            "state update",
  91         /* PFSYNC_ACT_UPD_C */          "compressed state update",
  92         /* PFSYNC_ACT_UPD_REQ */        "uncompressed state request",
  93         /* PFSYNC_ACT_DEL */            "state delete",
  94         /* PFSYNC_ACT_DEL_C */          "compressed state delete",
  95         /* PFSYNC_ACT_INS_F */          "fragment insert",
  96         /* PFSYNC_ACT_DEL_F */          "fragment delete",
  97         /* PFSYNC_ACT_BUS */            "bulk update mark",
  98         /* PFSYNC_ACT_TDB */            "TDB replay counter update",
  99         /* PFSYNC_ACT_EOF */            "end of frame mark",
 100 };
 101
 102 static const char* pfsyncacts_name[] = {
 103         /* PFSYNC_ACT_CLR */            "clear-all-request",
 104         /* PFSYNC_ACT_INS */            "state-insert",
 105         /* PFSYNC_ACT_INS_ACK */        "state-inserted-ack",
 106         /* PFSYNC_ACT_UPD */            "state-update",
 107         /* PFSYNC_ACT_UPD_C */          "compressed-state-update",
 108         /* PFSYNC_ACT_UPD_REQ */        "uncompressed-state-request",
 109         /* PFSYNC_ACT_DEL */            "state-delete",
 110         /* PFSYNC_ACT_DEL_C */          "compressed-state-delete",
 111         /* PFSYNC_ACT_INS_F */          "fragment-insert",
 112         /* PFSYNC_ACT_DEL_F */          "fragment-delete",
 113         /* PFSYNC_ACT_BUS */            "bulk-update-mark",
 114         /* PFSYNC_ACT_TDB */            "TDB-replay-counter-update",
 115         /* PFSYNC_ACT_EOF */            "end-of-frame-mark",
 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, zerostat;
 143         size_t len = sizeof(struct pfsyncstats);
 144
 145         if (live) {
 146                 if (zflag)
 147                         memset(&zerostat, 0, len);
 148                 if (sysctlbyname("net.pfsync.stats", &pfsyncstat, &len,
 149                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 150                         if (errno != ENOENT)
 151                                 warn("sysctl: net.pfsync.stats");
 152                         return;
 153                 }
 154         } else
 155                 kread(off, &pfsyncstat, len);
 156
 157         xo_emit("{T:/%s}:\n", name);
 158         xo_open_container(name);
 159
 160 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 161         xo_emit(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 162
 163         p(pfsyncs_ipackets, "\t{:received-inet-packets/%ju} "
 164             "{N:/packet%s received (IPv4)}\n");
 165         p(pfsyncs_ipackets6, "\t{:received-inet6-packets/%ju} "
 166             "{N:/packet%s received (IPv6)}\n");
 167         pfsync_acts_stats("input-histogram", "received",
 168             &pfsyncstat.pfsyncs_iacts[0]);
 169         p(pfsyncs_badif, "\t\t/{:dropped-bad-interface/%ju} "
 170             "{N:/packet%s discarded for bad interface}\n");
 171         p(pfsyncs_badttl, "\t\t{:dropped-bad-ttl/%ju} "
 172             "{N:/packet%s discarded for bad ttl}\n");
 173         p(pfsyncs_hdrops, "\t\t{:dropped-short-header/%ju} "
 174             "{N:/packet%s shorter than header}\n");
 175         p(pfsyncs_badver, "\t\t{:dropped-bad-version/%ju} "
 176             "{N:/packet%s discarded for bad version}\n");
 177         p(pfsyncs_badauth, "\t\t{:dropped-bad-auth/%ju} "
 178             "{N:/packet%s discarded for bad HMAC}\n");
 179         p(pfsyncs_badact,"\t\t{:dropped-bad-action/%ju} "
 180             "{N:/packet%s discarded for bad action}\n");
 181         p(pfsyncs_badlen, "\t\t{:dropped-short/%ju} "
 182             "{N:/packet%s discarded for short packet}\n");
 183         p(pfsyncs_badval, "\t\t{:dropped-bad-values/%ju} "
 184             "{N:/state%s discarded for bad values}\n");
 185         p(pfsyncs_stale, "\t\t{:dropped-stale-state/%ju} "
 186             "{N:/stale state%s}\n");
 187         p(pfsyncs_badstate, "\t\t{:dropped-failed-lookup/%ju} "
 188             "{N:/failed state lookup\\/insert%s}\n");
 189         p(pfsyncs_opackets, "\t{:sent-inet-packets/%ju} "
 190             "{N:/packet%s sent (IPv4})\n");
 191         p(pfsyncs_opackets6, "\t{:send-inet6-packets/%ju} "
 192             "{N:/packet%s sent (IPv6})\n");
 193         pfsync_acts_stats("output-histogram", "sent",
 194             &pfsyncstat.pfsyncs_oacts[0]);
 195         p(pfsyncs_onomem, "\t\t{:discarded-no-memory/%ju} "
 196             "{N:/failure%s due to mbuf memory error}\n");
 197         p(pfsyncs_oerrors, "\t\t{:send-errors/%ju} "
 198             "{N:/send error%s}\n");
 199 #undef p
 200         xo_close_container(name);
 201 }
 202 #endif /* PF */
 203
 204 /*
 205  * Display a formatted value, or a '-' in the same space.
 206  */
 207 static void
 208 show_stat(const char *fmt, int width, const char *name,
 209     u_long value, short showvalue)
 210 {
 211         const char *lsep, *rsep;
 212         char newfmt[64];
 213
 214         lsep = "";
 215         if (strncmp(fmt, "LS", 2) == 0) {
 216                 lsep = " ";
 217                 fmt += 2;
 218         }
 219         rsep = " ";
 220         if (strncmp(fmt, "NRS", 3) == 0) {
 221                 rsep = "";
 222                 fmt += 3;
 223         }
 224         if (showvalue == 0) {
 225                 /* Print just dash. */
 226                 xo_emit("{P:/%s}{D:/%*s}{P:/%s}", lsep, width, "-", rsep);
 227                 return;
 228         }
 229
 230         /*
 231          * XXX: workaround {P:} modifier can't be empty and doesn't seem to
 232          * take args... so we need to conditionally include it in the format.
 233          */
 234 #define maybe_pad(pad)  do {                                                \
 235         if (strlen(pad)) {                                                  \
 236                 snprintf(newfmt, sizeof(newfmt), "{P:%s}", pad);            \
 237                 xo_emit(newfmt);                                            \
 238         }                                                                   \
 239 } while (0)
 240
 241         if (hflag) {
 242                 char buf[5];
 243
 244                 /* Format in human readable form. */
 245                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 246                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL);
 247                 maybe_pad(lsep);
 248                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%ds}", name, width);
 249                 xo_emit(newfmt, buf);
 250                 maybe_pad(rsep);
 251         } else {
 252                 /* Construct the format string. */
 253                 maybe_pad(lsep);
 254                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%d%s}",
 255                     name, width, fmt);
 256                 xo_emit(newfmt, value);
 257                 maybe_pad(rsep);
 258         }
 259 }
 260
 261 /*
 262  * Find next multiaddr for a given interface name.
 263  */
 264 static struct ifmaddrs *
 265 next_ifma(struct ifmaddrs *ifma, const char *name, const sa_family_t family)
 266 {
 267
 268         for(; ifma != NULL; ifma = ifma->ifma_next) {
 269                 struct sockaddr_dl *sdl;
 270
 271                 sdl = (struct sockaddr_dl *)ifma->ifma_name;
 272                 if (ifma->ifma_addr->sa_family == family &&
 273                     strcmp(sdl->sdl_data, name) == 0)
 274                         break;
 275         }
 276
 277         return (ifma);
 278 }
 279
 280 /*
 281  * Print a description of the network interfaces.
 282  */
 283 void
 284 intpr(int interval, void (*pfunc)(char *), int af)
 285 {
 286         struct ifaddrs *ifap, *ifa;
 287         struct ifmaddrs *ifmap, *ifma;
 288
 289         if (interval)
 290                 return sidewaysintpr(interval);
 291
 292         if (getifaddrs(&ifap) != 0)
 293                 err(EX_OSERR, "getifaddrs");
 294         if (aflag && getifmaddrs(&ifmap) != 0)
 295                 err(EX_OSERR, "getifmaddrs");
 296
 297         xo_open_list("interface");
 298         if (!pfunc) {
 299                 if (Wflag)
 300                         xo_emit("{T:/%-7.7s}", "Name");
 301                 else
 302                         xo_emit("{T:/%-5.5s}", "Name");
 303                 xo_emit(" {T:/%5.5s} {T:/%-13.13s} {T:/%-17.17s} {T:/%8.8s} "
 304                     "{T:/%5.5s} {T:/%5.5s}",
 305                     "Mtu", "Network", "Address", "Ipkts", "Ierrs", "Idrop");
 306                 if (bflag)
 307                         xo_emit(" {T:/%10.10s}","Ibytes");
 308                 xo_emit(" {T:/%8.8s} {T:/%5.5s}", "Opkts", "Oerrs");
 309                 if (bflag)
 310                         xo_emit(" {T:/%10.10s}","Obytes");
 311                 xo_emit(" {T:/%5s}", "Coll");
 312                 if (dflag)
 313                         xo_emit(" {T:/%s}", "Drop");
 314                 xo_emit("\n");
 315         }
 316
 317         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 318                 bool network = false, link = false;
 319                 char *name;
 320
 321                 if (interface != NULL && strcmp(ifa->ifa_name, interface) != 0)
 322                         continue;
 323
 324                 name = ifa->ifa_name;
 325
 326                 if (pfunc) {
 327
 328                         (*pfunc)(name);
 329
 330                         /*
 331                          * Skip all ifaddrs belonging to same interface.
 332                          */
 333                         while(ifa->ifa_next != NULL &&
 334                             (strcmp(ifa->ifa_next->ifa_name, name) == 0)) {
 335                                 ifa = ifa->ifa_next;
 336                         }
 337                         continue;
 338                 }
 339
 340                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 341                         continue;
 342
 343                 xo_open_instance("interface");
 344
 345                 if (Wflag)
 346                         xo_emit("{tk:name/%-7.7s}", name);
 347                 else
 348                         xo_emit("{tk:name/%-5.5s}", name);
 349
 350 #define IFA_MTU(ifa)    (((struct if_data *)(ifa)->ifa_data)->ifi_mtu)
 351                 show_stat("lu", 6, "mtu", IFA_MTU(ifa), IFA_MTU(ifa));
 352 #undef IFA_MTU
 353
 354                 switch (ifa->ifa_addr->sa_family) {
 355                 case AF_UNSPEC:
 356                         xo_emit("{:network/%-13.13s} ", "none");
 357                         xo_emit("{:address/%-15.15s} ", "none");
 358                         break;
 359                 case AF_INET:
 360                     {
 361                         struct sockaddr_in *sin, *mask;
 362
 363                         sin = (struct sockaddr_in *)ifa->ifa_addr;
 364                         mask = (struct sockaddr_in *)ifa->ifa_netmask;
 365                         xo_emit("{t:network/%-13.13s} ",
 366                             netname(sin->sin_addr.s_addr,
 367                             mask->sin_addr.s_addr));
 368                         xo_emit("{t:address/%-17.17s} ",
 369                             routename(sin->sin_addr.s_addr));
 370
 371                         network = true;
 372                         break;
 373                     }
 374 #ifdef INET6
 375                 case AF_INET6:
 376                     {
 377                         struct sockaddr_in6 *sin6, *mask;
 378
 379                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 380                         mask = (struct sockaddr_in6 *)ifa->ifa_netmask;
 381
 382                         xo_emit("{t:network/%-13.13s} ",
 383                             netname6(sin6, &mask->sin6_addr));
 384                         getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len,
 385                             addr_buf, sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 386                         xo_emit("{t:address/%-17.17s} ", addr_buf);
 387
 388                         network = 1;
 389                         break;
 390                     }
 391 #endif /* INET6 */
 392                 case AF_LINK:
 393                     {
 394                         struct sockaddr_dl *sdl;
 395                         char *cp, linknum[10];
 396                         int len = 32;
 397                         char buf[len];
 398                         int n, z;
 399
 400                         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 401                         cp = (char *)LLADDR(sdl);
 402                         n = sdl->sdl_alen;
 403                         sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 404                         xo_emit("{t:network/%-13.13s} ", linknum);
 405                         buf[0] = '\0';
 406                         z = 0;
 407                         while ((--n >= 0) && (z < len)) {
 408                                 snprintf(buf + z, len - z, "%02x%c",
 409                                     *cp++ & 0xff, n > 0 ? ':' : ' ');
 410                                 z += 3;
 411                         }
 412                         if (z > 0)
 413                                 xo_emit("{:address/%*s}", 32 - z, buf);
 414                         else
 415                                 xo_emit("{P:                  }");
 416                         link = 1;
 417                         break;
 418                     }
 419                 }
 420
 421 #define IFA_STAT(s)     (((struct if_data *)ifa->ifa_data)->ifi_ ## s)
 422                 show_stat("lu", 8, "received-packets", IFA_STAT(ipackets),
 423                     link|network);
 424                 show_stat("lu", 5, "received-errors", IFA_STAT(ierrors), link);
 425                 show_stat("lu", 5, "dropped-packet", IFA_STAT(iqdrops), link);
 426                 if (bflag)
 427                         show_stat("lu", 10, "received-bytes", IFA_STAT(ibytes),
 428                             link|network);
 429                 show_stat("lu", 8, "sent-packets", IFA_STAT(opackets),
 430                     link|network);
 431                 show_stat("lu", 5, "send-errors", IFA_STAT(oerrors), link);
 432                 if (bflag)
 433                         show_stat("lu", 10, "sent-bytes", IFA_STAT(obytes),
 434                             link|network);
 435                 show_stat("NRSlu", 5, "collisions", IFA_STAT(collisions), link);
 436                 if (dflag)
 437                         show_stat("LSlu", 5, "dropped-packets",
 438                             IFA_STAT(oqdrops), link);
 439                 xo_emit("\n");
 440
 441                 if (!aflag) {
 442                         xo_close_instance("interface");
 443                         continue;
 444                 }
 445
 446                 /*
 447                  * Print family's multicast addresses.
 448                  */
 449                 xo_open_list("multicast-address");
 450                 for (ifma = next_ifma(ifmap, ifa->ifa_name,
 451                     ifa->ifa_addr->sa_family);
 452                     ifma != NULL;
 453                     ifma = next_ifma(ifma, ifa->ifa_name,
 454                     ifa->ifa_addr->sa_family)) {
 455                         const char *fmt = NULL;
 456
 457                         xo_open_instance("multicast-address");
 458                         switch (ifma->ifma_addr->sa_family) {
 459                         case AF_INET:
 460                             {
 461                                 struct sockaddr_in *sin;
 462
 463                                 sin = (struct sockaddr_in *)ifma->ifma_addr;
 464                                 fmt = routename(sin->sin_addr.s_addr);
 465                                 break;
 466                             }
 467 #ifdef INET6
 468                         case AF_INET6:
 469
 470                                 /* in6_fillscopeid(&msa.in6); */
 471                                 getnameinfo(ifma->ifma_addr,
 472                                     ifma->ifma_addr->sa_len, addr_buf,
 473                                     sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 474                                 xo_emit("{P:/%*s }{t:address/%-19.19s}",
 475                                     Wflag ? 27 : 25, "", addr_buf);
 476                                 break;
 477 #endif /* INET6 */
 478                         case AF_LINK:
 479                             {
 480                                 struct sockaddr_dl *sdl;
 481
 482                                 sdl = (struct sockaddr_dl *)ifma->ifma_addr;
 483                                 switch (sdl->sdl_type) {
 484                                 case IFT_ETHER:
 485                                 case IFT_FDDI:
 486                                         fmt = ether_ntoa(
 487                                             (struct ether_addr *)LLADDR(sdl));
 488                                         break;
 489                                 }
 490                                 break;
 491                             }
 492                         }
 493
 494                         if (fmt) {
 495                                 xo_emit("{P:/%*s }{t:address/%-17.17s/}",
 496                                     Wflag ? 27 : 25, "", fmt);
 497                                 if (ifma->ifma_addr->sa_family == AF_LINK) {
 498                                         xo_emit(" {:received-packets/%8lu}",
 499                                             IFA_STAT(imcasts));
 500                                         xo_emit("{P:/%*s}", bflag? 17 : 6, "");
 501                                         xo_emit(" {:sent-packets/%8lu}",
 502                                             IFA_STAT(omcasts));
 503                                 }
 504                                 xo_emit("\n");
 505                         }
 506                         xo_close_instance("multicast-address");
 507                         ifma = ifma->ifma_next;
 508                 }
 509                 xo_close_list("multicast-address");
 510                 xo_close_instance("interface");
 511         }
 512         xo_close_list("interface");
 513
 514         freeifaddrs(ifap);
 515         if (aflag)
 516                 freeifmaddrs(ifmap);
 517 }
 518
 519 struct iftot {
 520         u_long  ift_ip;                 /* input packets */
 521         u_long  ift_ie;                 /* input errors */
 522         u_long  ift_id;                 /* input drops */
 523         u_long  ift_op;                 /* output packets */
 524         u_long  ift_oe;                 /* output errors */
 525         u_long  ift_od;                 /* output drops */
 526         u_long  ift_co;                 /* collisions */
 527         u_long  ift_ib;                 /* input bytes */
 528         u_long  ift_ob;                 /* output bytes */
 529 };
 530
 531 /*
 532  * Obtain stats for interface(s).
 533  */
 534 static void
 535 fill_iftot(struct iftot *st)
 536 {
 537         struct ifaddrs *ifap, *ifa;
 538         bool found = false;
 539
 540         if (getifaddrs(&ifap) != 0)
 541                 xo_err(EX_OSERR, "getifaddrs");
 542
 543         bzero(st, sizeof(*st));
 544
 545         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 546                 if (ifa->ifa_addr->sa_family != AF_LINK)
 547                         continue;
 548                 if (interface) {
 549                         if (strcmp(ifa->ifa_name, interface) == 0)
 550                                 found = true;
 551                         else
 552                                 continue;
 553                 }
 554
 555                 st->ift_ip += IFA_STAT(ipackets);
 556                 st->ift_ie += IFA_STAT(ierrors);
 557                 st->ift_id += IFA_STAT(iqdrops);
 558                 st->ift_ib += IFA_STAT(ibytes);
 559                 st->ift_op += IFA_STAT(opackets);
 560                 st->ift_oe += IFA_STAT(oerrors);
 561                 st->ift_od += IFA_STAT(oqdrops);
 562                 st->ift_ob += IFA_STAT(obytes);
 563                 st->ift_co += IFA_STAT(collisions);
 564         }
 565
 566         if (interface && found == false)
 567                 xo_err(EX_DATAERR, "interface %s not found", interface);
 568
 569         freeifaddrs(ifap);
 570 }
 571
 572 /*
 573  * Set a flag to indicate that a signal from the periodic itimer has been
 574  * caught.
 575  */
 576 static sig_atomic_t signalled;
 577 static void
 578 catchalarm(int signo __unused)
 579 {
 580         signalled = true;
 581 }
 582
 583 /*
 584  * Print a running summary of interface statistics.
 585  * Repeat display every interval seconds, showing statistics
 586  * collected over that interval.  Assumes that interval is non-zero.
 587  * First line printed at top of screen is always cumulative.
 588  */
 589 static void
 590 sidewaysintpr(int interval)
 591 {
 592         struct iftot ift[2], *new, *old;
 593         struct itimerval interval_it;
 594         int oldmask, line;
 595
 596         new = &ift[0];
 597         old = &ift[1];
 598         fill_iftot(old);
 599
 600         (void)signal(SIGALRM, catchalarm);
 601         signalled = false;
 602         interval_it.it_interval.tv_sec = interval;
 603         interval_it.it_interval.tv_usec = 0;
 604         interval_it.it_value = interval_it.it_interval;
 605         setitimer(ITIMER_REAL, &interval_it, NULL);
 606         xo_open_list("interface-statistics");
 607
 608 banner:
 609         xo_emit("{T:/%17s} {T:/%14s} {T:/%16s}\n", "input",
 610             interface != NULL ? interface : "(Total)", "output");
 611         xo_emit("{T:/%10s} {T:/%5s} {T:/%5s} {T:/%10s} {T:/%10s} {T:/%5s} "
 612             "{T:/%10s} {T:/%5s}",
 613             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 614             "colls");
 615         if (dflag)
 616                 xo_emit(" {T:/%5.5s}", "drops");
 617         xo_emit("\n");
 618         xo_flush();
 619         line = 0;
 620
 621 loop:
 622         if ((noutputs != 0) && (--noutputs == 0)) {
 623                 xo_close_list("interface-statistics");
 624                 return;
 625         }
 626         oldmask = sigblock(sigmask(SIGALRM));
 627         while (!signalled)
 628                 sigpause(0);
 629         signalled = false;
 630         sigsetmask(oldmask);
 631         line++;
 632
 633         fill_iftot(new);
 634
 635         xo_open_instance("stats");
 636         show_stat("lu", 10, "received-packets",
 637             new->ift_ip - old->ift_ip, 1);
 638         show_stat("lu", 5, "received-errors",
 639             new->ift_ie - old->ift_ie, 1);
 640         show_stat("lu", 5, "dropped-packets",
 641             new->ift_id - old->ift_id, 1);
 642         show_stat("lu", 10, "received-bytes",
 643             new->ift_ib - old->ift_ib, 1);
 644         show_stat("lu", 10, "sent-packets",
 645             new->ift_op - old->ift_op, 1);
 646         show_stat("lu", 5, "send-errors",
 647             new->ift_oe - old->ift_oe, 1);
 648         show_stat("lu", 10, "sent-bytes",
 649             new->ift_ob - old->ift_ob, 1);
 650         show_stat("NRSlu", 5, "collisions",
 651             new->ift_co - old->ift_co, 1);
 652         if (dflag)
 653                 show_stat("LSlu", 5, "dropped-packets",
 654                     new->ift_od - old->ift_od, 1);
 655         xo_close_instance("stats");
 656         xo_emit("\n");
 657         xo_flush();
 658
 659         if (new == &ift[0]) {
 660                 new = &ift[1];
 661                 old = &ift[0];
 662         } else {
 663                 new = &ift[0];
 664                 old = &ift[1];
 665         }
 666
 667         if (line == 21)
 668                 goto banner;
 669         else
 670                 goto loop;
 671
 672         /* NOTREACHED */
 673 }