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