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 #include <sys/param.h>
  34 #include <sys/protosw.h>
  35 #include <sys/socket.h>
  36 #include <sys/socketvar.h>
  37 #include <sys/time.h>
  38
  39 #include <net/if.h>
  40 #include <net/if_dl.h>
  41 #include <net/if_types.h>
  42 #include <net/ethernet.h>
  43 #include <netinet/in.h>
  44 #include <netinet/in_var.h>
  45 #include <arpa/inet.h>
  46 #ifdef PF
  47 #include <net/pfvar.h>
  48 #include <net/if_pfsync.h>
  49 #endif
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <ifaddrs.h>
  54 #include <libutil.h>
  55 #ifdef INET6
  56 #include <netdb.h>
  57 #endif
  58 #include <signal.h>
  59 #include <stdbool.h>
  60 #include <stdint.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <sysexits.h>
  65 #include <unistd.h>
  66 #include <libxo/xo.h>
  67
  68 #include "netstat.h"
  69
  70 static void sidewaysintpr(void);
  71
  72 #ifdef PF
  73 static const char* pfsyncacts[] = {
  74         /* PFSYNC_ACT_CLR */            "clear all request",
  75         /* PFSYNC_ACT_INS_1301 */       "13.1 state insert",
  76         /* PFSYNC_ACT_INS_ACK */        "state inserted ack",
  77         /* PFSYNC_ACT_UPD_1301 */       "13.1 state update",
  78         /* PFSYNC_ACT_UPD_C */          "compressed state update",
  79         /* PFSYNC_ACT_UPD_REQ */        "uncompressed state request",
  80         /* PFSYNC_ACT_DEL */            "state delete",
  81         /* PFSYNC_ACT_DEL_C */          "compressed state delete",
  82         /* PFSYNC_ACT_INS_F */          "fragment insert",
  83         /* PFSYNC_ACT_DEL_F */          "fragment delete",
  84         /* PFSYNC_ACT_BUS */            "bulk update mark",
  85         /* PFSYNC_ACT_TDB */            "TDB replay counter update",
  86         /* PFSYNC_ACT_EOF */            "end of frame mark",
  87         /* PFSYNC_ACT_INS_1400 */       "state insert",
  88         /* PFSYNC_ACT_UPD_1400 */       "state update",
  89 };
  90
  91 static const char* pfsyncacts_name[] = {
  92         /* PFSYNC_ACT_CLR */            "clear-all-request",
  93         /* PFSYNC_ACT_INS_1301 */       "state-insert-1301",
  94         /* PFSYNC_ACT_INS_ACK */        "state-inserted-ack",
  95         /* PFSYNC_ACT_UPD_1301 */       "state-update-1301",
  96         /* PFSYNC_ACT_UPD_C */          "compressed-state-update",
  97         /* PFSYNC_ACT_UPD_REQ */        "uncompressed-state-request",
  98         /* PFSYNC_ACT_DEL */            "state-delete",
  99         /* PFSYNC_ACT_DEL_C */          "compressed-state-delete",
 100         /* PFSYNC_ACT_INS_F */          "fragment-insert",
 101         /* PFSYNC_ACT_DEL_F */          "fragment-delete",
 102         /* PFSYNC_ACT_BUS */            "bulk-update-mark",
 103         /* PFSYNC_ACT_TDB */            "TDB-replay-counter-update",
 104         /* PFSYNC_ACT_EOF */            "end-of-frame-mark",
 105         /* PFSYNC_ACT_INS_1400 */       "state-insert",
 106         /* PFSYNC_ACT_UPD_1400 */       "state-update",
 107 };
 108
 109 static void
 110 pfsync_acts_stats(const char *list, const char *desc, uint64_t *a)
 111 {
 112         int i;
 113
 114         xo_open_list(list);
 115         for (i = 0; i < PFSYNC_ACT_MAX; i++, a++) {
 116                 if (*a || sflag <= 1) {
 117                         xo_open_instance(list);
 118                         xo_emit("\t\t{e:name}{:count/%ju} {N:/%s%s %s}\n",
 119                             pfsyncacts_name[i], (uintmax_t)(*a),
 120                             pfsyncacts[i], plural(*a), desc);
 121                         xo_close_instance(list);
 122                 }
 123         }
 124         xo_close_list(list);
 125 }
 126
 127 /*
 128  * Dump pfsync statistics structure.
 129  */
 130 void
 131 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 132 {
 133         struct pfsyncstats pfsyncstat;
 134
 135         if (fetch_stats("net.pfsync.stats", off, &pfsyncstat,
 136             sizeof(pfsyncstat), kread) != 0)
 137                 return;
 138
 139         xo_emit("{T:/%s}:\n", name);
 140         xo_open_container(name);
 141
 142 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 143         xo_emit(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 144
 145         p(pfsyncs_ipackets, "\t{:received-inet-packets/%ju} "
 146             "{N:/packet%s received (IPv4)}\n");
 147         p(pfsyncs_ipackets6, "\t{:received-inet6-packets/%ju} "
 148             "{N:/packet%s received (IPv6)}\n");
 149         pfsync_acts_stats("input-histogram", "received",
 150             &pfsyncstat.pfsyncs_iacts[0]);
 151         p(pfsyncs_badif, "\t\t{:dropped-bad-interface/%ju} "
 152             "{N:/packet%s discarded for bad interface}\n");
 153         p(pfsyncs_badttl, "\t\t{:dropped-bad-ttl/%ju} "
 154             "{N:/packet%s discarded for bad ttl}\n");
 155         p(pfsyncs_hdrops, "\t\t{:dropped-short-header/%ju} "
 156             "{N:/packet%s shorter than header}\n");
 157         p(pfsyncs_badver, "\t\t{:dropped-bad-version/%ju} "
 158             "{N:/packet%s discarded for bad version}\n");
 159         p(pfsyncs_badauth, "\t\t{:dropped-bad-auth/%ju} "
 160             "{N:/packet%s discarded for bad HMAC}\n");
 161         p(pfsyncs_badact,"\t\t{:dropped-bad-action/%ju} "
 162             "{N:/packet%s discarded for bad action}\n");
 163         p(pfsyncs_badlen, "\t\t{:dropped-short/%ju} "
 164             "{N:/packet%s discarded for short packet}\n");
 165         p(pfsyncs_badval, "\t\t{:dropped-bad-values/%ju} "
 166             "{N:/state%s discarded for bad values}\n");
 167         p(pfsyncs_stale, "\t\t{:dropped-stale-state/%ju} "
 168             "{N:/stale state%s}\n");
 169         p(pfsyncs_badstate, "\t\t{:dropped-failed-lookup/%ju} "
 170             "{N:/failed state lookup\\/insert%s}\n");
 171         p(pfsyncs_opackets, "\t{:sent-inet-packets/%ju} "
 172             "{N:/packet%s sent (IPv4})\n");
 173         p(pfsyncs_opackets6, "\t{:send-inet6-packets/%ju} "
 174             "{N:/packet%s sent (IPv6})\n");
 175         pfsync_acts_stats("output-histogram", "sent",
 176             &pfsyncstat.pfsyncs_oacts[0]);
 177         p(pfsyncs_onomem, "\t\t{:discarded-no-memory/%ju} "
 178             "{N:/failure%s due to mbuf memory error}\n");
 179         p(pfsyncs_oerrors, "\t\t{:send-errors/%ju} "
 180             "{N:/send error%s}\n");
 181 #undef p
 182         xo_close_container(name);
 183 }
 184 #endif /* PF */
 185
 186 /*
 187  * Display a formatted value, or a '-' in the same space.
 188  */
 189 static void
 190 show_stat(const char *fmt, int width, const char *name,
 191     u_long value, short showvalue, int div1000)
 192 {
 193         const char *lsep, *rsep;
 194         char newfmt[64];
 195
 196         lsep = "";
 197         if (strncmp(fmt, "LS", 2) == 0) {
 198                 lsep = " ";
 199                 fmt += 2;
 200         }
 201         rsep = " ";
 202         if (strncmp(fmt, "NRS", 3) == 0) {
 203                 rsep = "";
 204                 fmt += 3;
 205         }
 206         if (showvalue == 0) {
 207                 /* Print just dash. */
 208                 xo_emit("{P:/%s}{D:/%*s}{P:/%s}", lsep, width, "-", rsep);
 209                 return;
 210         }
 211
 212         /*
 213          * XXX: workaround {P:} modifier can't be empty and doesn't seem to
 214          * take args... so we need to conditionally include it in the format.
 215          */
 216 #define maybe_pad(pad)  do {                                                \
 217         if (strlen(pad)) {                                                  \
 218                 snprintf(newfmt, sizeof(newfmt), "{P:%s}", pad);            \
 219                 xo_emit(newfmt);                                            \
 220         }                                                                   \
 221 } while (0)
 222
 223         if (hflag) {
 224                 char buf[5];
 225
 226                 /* Format in human readable form. */
 227                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 228                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL | \
 229                     ((div1000) ? HN_DIVISOR_1000 : 0));
 230                 maybe_pad(lsep);
 231                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%ds}", name, width);
 232                 xo_emit(newfmt, buf);
 233                 maybe_pad(rsep);
 234         } else {
 235                 /* Construct the format string. */
 236                 maybe_pad(lsep);
 237                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%d%s}",
 238                     name, width, fmt);
 239                 xo_emit(newfmt, value);
 240                 maybe_pad(rsep);
 241         }
 242 }
 243
 244 /*
 245  * Find next multiaddr for a given interface name.
 246  */
 247 static struct ifmaddrs *
 248 next_ifma(struct ifmaddrs *ifma, const char *name, const sa_family_t family)
 249 {
 250
 251         for(; ifma != NULL; ifma = ifma->ifma_next) {
 252                 struct sockaddr_dl *sdl;
 253
 254                 sdl = (struct sockaddr_dl *)ifma->ifma_name;
 255                 if (ifma->ifma_addr->sa_family == family &&
 256                     strcmp(sdl->sdl_data, name) == 0)
 257                         break;
 258         }
 259
 260         return (ifma);
 261 }
 262
 263 enum process_op { MEASURE, EMIT };
 264
 265 static void
 266 process_ifa_addr(enum process_op op, struct ifaddrs *ifa, int *max_net_len,
 267     int *max_addr_len, bool *network, bool *link)
 268 {
 269         int net_len, addr_len;
 270         const char *nn, *rn;
 271
 272         if (op == EMIT) {
 273                 net_len = *max_net_len;
 274                 addr_len = *max_addr_len;
 275         }
 276
 277         switch (ifa->ifa_addr->sa_family) {
 278         case AF_UNSPEC:
 279                 if (op == MEASURE) {
 280                         net_len = strlen("none");
 281                         addr_len = strlen("none");
 282                 } else {
 283                         xo_emit("{:network/%-*.*s}  ", net_len, net_len,
 284                             "none");
 285                         xo_emit("{:address/%-*.*s} ", addr_len, addr_len,
 286                             "none");
 287                 }
 288                 break;
 289         case AF_INET:
 290 #ifdef INET6
 291         case AF_INET6:
 292 #endif /* INET6 */
 293                 nn = netname(ifa->ifa_addr, ifa->ifa_netmask);
 294                 rn = routename(ifa->ifa_addr, numeric_addr);
 295                 if (op == MEASURE) {
 296                         net_len = strlen(nn);
 297                         addr_len = strlen(rn);
 298                 } else {
 299                         xo_emit("{t:network/%-*s}  ", net_len, nn);
 300                         xo_emit("{t:address/%-*s} ", addr_len, rn);
 301                 }
 302
 303                 if (network != NULL)
 304                         *network = true;
 305                 break;
 306         case AF_LINK:
 307             {
 308                 struct sockaddr_dl *sdl;
 309                 char linknum[sizeof("<Link#32767>")];
 310
 311                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 312                 snprintf(linknum, sizeof(linknum), "<Link#%d>", sdl->sdl_index);
 313                 if (op == MEASURE) {
 314                         net_len = strlen(linknum);
 315                         if (sdl->sdl_nlen == 0 &&
 316                             sdl->sdl_alen == 0 &&
 317                             sdl->sdl_slen == 0)
 318                                 addr_len = 1;
 319                         else
 320                                 addr_len = strlen(routename(ifa->ifa_addr, 1));
 321                 } else {
 322                         xo_emit("{t:network/%-*.*s}  ", net_len, net_len,
 323                             linknum);
 324                         if (sdl->sdl_nlen == 0 &&
 325                             sdl->sdl_alen == 0 &&
 326                             sdl->sdl_slen == 0)
 327                                 xo_emit("{P:/%*s} ", addr_len, "");
 328                         else
 329                                 xo_emit("{t:address/%-*.*s} ", addr_len,
 330                                     addr_len, routename(ifa->ifa_addr, 1));
 331                 }
 332                 if (link != NULL)
 333                         *link = true;
 334                 break;
 335             }
 336         }
 337
 338         if (op == MEASURE) {
 339                 if (net_len > *max_net_len)
 340                         *max_net_len = net_len;
 341                 if (addr_len > *max_addr_len)
 342                         *max_addr_len = addr_len;
 343         }
 344 }
 345
 346 static int
 347 max_num_len(int max_len, u_long num)
 348 {
 349         int len = 2;            /* include space */
 350
 351         for (; num > 10; len++)
 352                 num /= 10;
 353         return (MAX(max_len, len));
 354 }
 355
 356 /*
 357  * Print a description of the network interfaces.
 358  */
 359 void
 360 intpr(void (*pfunc)(char *), int af)
 361 {
 362         struct ifaddrs *ifap, *ifa;
 363         struct ifmaddrs *ifmap, *ifma;
 364         u_int ifn_len_max = 5, ifn_len;
 365         u_int net_len = strlen("Network "), addr_len = strlen("Address ");
 366         u_int npkt_len = 8, nbyte_len = 10, nerr_len = 5;
 367
 368         if (interval)
 369                 return sidewaysintpr();
 370
 371         if (getifaddrs(&ifap) != 0)
 372                 err(EX_OSERR, "getifaddrs");
 373         if (aflag && getifmaddrs(&ifmap) != 0)
 374                 err(EX_OSERR, "getifmaddrs");
 375
 376         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 377                 if (interface != NULL &&
 378                     strcmp(ifa->ifa_name, interface) != 0)
 379                         continue;
 380                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 381                         continue;
 382                 ifn_len = strlen(ifa->ifa_name);
 383                 if ((ifa->ifa_flags & IFF_UP) == 0)
 384                         ++ifn_len;
 385                 ifn_len_max = MAX(ifn_len_max, ifn_len);
 386                 process_ifa_addr(MEASURE, ifa, &net_len, &addr_len,
 387                     NULL, NULL);
 388
 389 #define IFA_STAT(s)     (((struct if_data *)ifa->ifa_data)->ifi_ ## s)
 390                 if (!hflag) {
 391                         npkt_len = max_num_len(npkt_len, IFA_STAT(ipackets));
 392                         npkt_len = max_num_len(npkt_len, IFA_STAT(opackets));
 393                         nerr_len = max_num_len(nerr_len, IFA_STAT(ierrors));
 394                         nerr_len = max_num_len(nerr_len, IFA_STAT(iqdrops));
 395                         nerr_len = max_num_len(nerr_len, IFA_STAT(collisions));
 396                         if (dflag)
 397                                 nerr_len = max_num_len(nerr_len,
 398                                     IFA_STAT(oqdrops));
 399                         if (bflag) {
 400                                 nbyte_len = max_num_len(nbyte_len,
 401                                     IFA_STAT(ibytes));
 402                                 nbyte_len = max_num_len(nbyte_len,
 403                                     IFA_STAT(obytes));
 404                         }
 405                 }
 406         }
 407
 408         xo_open_list("interface");
 409         if (!pfunc) {
 410                 xo_emit("{T:/%-*.*s}", ifn_len_max, ifn_len_max, "Name");
 411                 xo_emit(" {T:/%5.5s} {T:/%-*.*s}  {T:/%-*.*s} {T:/%*.*s} "
 412                     "{T:/%*.*s} {T:/%*.*s}",
 413                     "Mtu", net_len, net_len, "Network", addr_len, addr_len,
 414                     "Address", npkt_len, npkt_len, "Ipkts",
 415                     nerr_len, nerr_len, "Ierrs", nerr_len, nerr_len, "Idrop");
 416                 if (bflag)
 417                         xo_emit(" {T:/%*.*s}", nbyte_len, nbyte_len, "Ibytes");
 418                 xo_emit(" {T:/%*.*s} {T:/%*.*s}", npkt_len, npkt_len, "Opkts",
 419                     nerr_len, nerr_len, "Oerrs");
 420                 if (bflag)
 421                         xo_emit(" {T:/%*.*s}", nbyte_len, nbyte_len, "Obytes");
 422                 xo_emit(" {T:/%*s}", nerr_len, "Coll");
 423                 if (dflag)
 424                         xo_emit(" {T:/%*.*s}", nerr_len, nerr_len, "Drop");
 425                 xo_emit("\n");
 426         }
 427
 428         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 429                 bool network = false, link = false;
 430                 char *name, *xname, buf[IFNAMSIZ+1];
 431
 432                 if (interface != NULL && strcmp(ifa->ifa_name, interface) != 0)
 433                         continue;
 434
 435                 name = ifa->ifa_name;
 436
 437                 if (pfunc) {
 438
 439                         (*pfunc)(name);
 440
 441                         /*
 442                          * Skip all ifaddrs belonging to same interface.
 443                          */
 444                         while(ifa->ifa_next != NULL &&
 445                             (strcmp(ifa->ifa_next->ifa_name, name) == 0)) {
 446                                 ifa = ifa->ifa_next;
 447                         }
 448                         continue;
 449                 }
 450
 451                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 452                         continue;
 453
 454                 xo_open_instance("interface");
 455
 456                 if ((ifa->ifa_flags & IFF_UP) == 0) {
 457                         xname = stpcpy(buf, name);
 458                         *xname++ = '*';
 459                         *xname = '\0';
 460                         xname = buf;
 461                 } else
 462                         xname = name;
 463
 464                 xo_emit("{d:/%-*.*s}{etk:name}{eq:flags/0x%x}",
 465                     ifn_len_max, ifn_len_max, xname, name, ifa->ifa_flags);
 466
 467 #define IFA_MTU(ifa)    (((struct if_data *)(ifa)->ifa_data)->ifi_mtu)
 468                 show_stat("lu", 6, "mtu", IFA_MTU(ifa), IFA_MTU(ifa), 0);
 469 #undef IFA_MTU
 470
 471                 process_ifa_addr(EMIT, ifa, &net_len, &addr_len,
 472                     &network, &link);
 473
 474                 show_stat("lu", npkt_len, "received-packets",
 475                     IFA_STAT(ipackets), link|network, 1);
 476                 show_stat("lu", nerr_len, "received-errors", IFA_STAT(ierrors),
 477                     link, 1);
 478                 show_stat("lu", nerr_len, "dropped-packets", IFA_STAT(iqdrops),
 479                     link, 1);
 480                 if (bflag)
 481                         show_stat("lu", nbyte_len, "received-bytes",
 482                             IFA_STAT(ibytes), link|network, 0);
 483                 show_stat("lu", npkt_len, "sent-packets", IFA_STAT(opackets),
 484                     link|network, 1);
 485                 show_stat("lu", nerr_len, "send-errors", IFA_STAT(oerrors),
 486                     link, 1);
 487                 if (bflag)
 488                         show_stat("lu", nbyte_len, "sent-bytes",
 489                             IFA_STAT(obytes), link|network, 0);
 490                 show_stat("NRSlu", nerr_len, "collisions", IFA_STAT(collisions),
 491                     link, 1);
 492                 if (dflag)
 493                         show_stat("LSlu", nerr_len, "dropped-packets",
 494                             IFA_STAT(oqdrops), link, 1);
 495                 xo_emit("\n");
 496
 497                 if (!aflag) {
 498                         xo_close_instance("interface");
 499                         continue;
 500                 }
 501
 502                 /*
 503                  * Print family's multicast addresses.
 504                  */
 505                 xo_open_list("multicast-address");
 506                 for (ifma = next_ifma(ifmap, ifa->ifa_name,
 507                     ifa->ifa_addr->sa_family);
 508                     ifma != NULL;
 509                     ifma = next_ifma(ifma, ifa->ifa_name,
 510                     ifa->ifa_addr->sa_family)) {
 511                         const char *fmt = NULL;
 512
 513                         xo_open_instance("multicast-address");
 514                         switch (ifma->ifma_addr->sa_family) {
 515                         case AF_LINK:
 516                             {
 517                                 struct sockaddr_dl *sdl;
 518
 519                                 sdl = (struct sockaddr_dl *)ifma->ifma_addr;
 520                                 if (sdl->sdl_type != IFT_ETHER &&
 521                                     sdl->sdl_type != IFT_FDDI)
 522                                         break;
 523                             }
 524                                 /* FALLTHROUGH */
 525                         case AF_INET:
 526 #ifdef INET6
 527                         case AF_INET6:
 528 #endif /* INET6 */
 529                                 fmt = routename(ifma->ifma_addr, numeric_addr);
 530                                 break;
 531                         }
 532                         if (fmt) {
 533                                 if (Wflag)
 534                                         xo_emit("{P:/%27s }"
 535                                             "{t:address/%-17s/}", "", fmt);
 536                                 else
 537                                         xo_emit("{P:/%25s }"
 538                                             "{t:address/%-17.17s/}", "", fmt);
 539                                 if (ifma->ifma_addr->sa_family == AF_LINK) {
 540                                         xo_emit(" {:received-packets/%8lu}",
 541                                             IFA_STAT(imcasts));
 542                                         xo_emit("{P:/%*s}", bflag? 17 : 6, "");
 543                                         xo_emit(" {:sent-packets/%8lu}",
 544                                             IFA_STAT(omcasts));
 545                                 }
 546                                 xo_emit("\n");
 547                         }
 548                         xo_close_instance("multicast-address");
 549                         ifma = ifma->ifma_next;
 550                 }
 551                 xo_close_list("multicast-address");
 552                 xo_close_instance("interface");
 553         }
 554         xo_close_list("interface");
 555
 556         freeifaddrs(ifap);
 557         if (aflag)
 558                 freeifmaddrs(ifmap);
 559 }
 560
 561 struct iftot {
 562         u_long  ift_ip;                 /* input packets */
 563         u_long  ift_ie;                 /* input errors */
 564         u_long  ift_id;                 /* input drops */
 565         u_long  ift_op;                 /* output packets */
 566         u_long  ift_oe;                 /* output errors */
 567         u_long  ift_od;                 /* output drops */
 568         u_long  ift_co;                 /* collisions */
 569         u_long  ift_ib;                 /* input bytes */
 570         u_long  ift_ob;                 /* output bytes */
 571 };
 572
 573 /*
 574  * Obtain stats for interface(s).
 575  */
 576 static void
 577 fill_iftot(struct iftot *st)
 578 {
 579         struct ifaddrs *ifap, *ifa;
 580         bool found = false;
 581
 582         if (getifaddrs(&ifap) != 0)
 583                 xo_err(EX_OSERR, "getifaddrs");
 584
 585         bzero(st, sizeof(*st));
 586
 587         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 588                 if (ifa->ifa_addr->sa_family != AF_LINK)
 589                         continue;
 590                 if (interface) {
 591                         if (strcmp(ifa->ifa_name, interface) == 0)
 592                                 found = true;
 593                         else
 594                                 continue;
 595                 }
 596
 597                 st->ift_ip += IFA_STAT(ipackets);
 598                 st->ift_ie += IFA_STAT(ierrors);
 599                 st->ift_id += IFA_STAT(iqdrops);
 600                 st->ift_ib += IFA_STAT(ibytes);
 601                 st->ift_op += IFA_STAT(opackets);
 602                 st->ift_oe += IFA_STAT(oerrors);
 603                 st->ift_od += IFA_STAT(oqdrops);
 604                 st->ift_ob += IFA_STAT(obytes);
 605                 st->ift_co += IFA_STAT(collisions);
 606         }
 607
 608         if (interface && found == false)
 609                 xo_err(EX_DATAERR, "interface %s not found", interface);
 610
 611         freeifaddrs(ifap);
 612 }
 613
 614 /*
 615  * Set a flag to indicate that a signal from the periodic itimer has been
 616  * caught.
 617  */
 618 static sig_atomic_t signalled;
 619 static void
 620 catchalarm(int signo __unused)
 621 {
 622         signalled = true;
 623 }
 624
 625 /*
 626  * Print a running summary of interface statistics.
 627  * Repeat display every interval seconds, showing statistics
 628  * collected over that interval.  Assumes that interval is non-zero.
 629  * First line printed at top of screen is always cumulative.
 630  */
 631 static void
 632 sidewaysintpr(void)
 633 {
 634         struct iftot ift[2], *new, *old;
 635         struct itimerval interval_it;
 636         int oldmask, line;
 637
 638         new = &ift[0];
 639         old = &ift[1];
 640         fill_iftot(old);
 641
 642         (void)signal(SIGALRM, catchalarm);
 643         signalled = false;
 644         interval_it.it_interval.tv_sec = interval;
 645         interval_it.it_interval.tv_usec = 0;
 646         interval_it.it_value = interval_it.it_interval;
 647         setitimer(ITIMER_REAL, &interval_it, NULL);
 648         xo_open_list("interface-statistics");
 649
 650 banner:
 651         xo_emit("{T:/%17s} {T:/%14s} {T:/%16s}\n", "input",
 652             interface != NULL ? interface : "(Total)", "output");
 653         xo_emit("{T:/%10s} {T:/%5s} {T:/%5s} {T:/%10s} {T:/%10s} {T:/%5s} "
 654             "{T:/%10s} {T:/%5s}",
 655             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 656             "colls");
 657         if (dflag)
 658                 xo_emit(" {T:/%5.5s}", "drops");
 659         xo_emit("\n");
 660         xo_flush();
 661         line = 0;
 662
 663 loop:
 664         if ((noutputs != 0) && (--noutputs == 0)) {
 665                 xo_close_list("interface-statistics");
 666                 return;
 667         }
 668         oldmask = sigblock(sigmask(SIGALRM));
 669         while (!signalled)
 670                 sigpause(0);
 671         signalled = false;
 672         sigsetmask(oldmask);
 673         line++;
 674
 675         fill_iftot(new);
 676
 677         xo_open_instance("stats");
 678         show_stat("lu", 10, "received-packets",
 679             new->ift_ip - old->ift_ip, 1, 1);
 680         show_stat("lu", 5, "received-errors",
 681             new->ift_ie - old->ift_ie, 1, 1);
 682         show_stat("lu", 5, "dropped-packets",
 683             new->ift_id - old->ift_id, 1, 1);
 684         show_stat("lu", 10, "received-bytes",
 685             new->ift_ib - old->ift_ib, 1, 0);
 686         show_stat("lu", 10, "sent-packets",
 687             new->ift_op - old->ift_op, 1, 1);
 688         show_stat("lu", 5, "send-errors",
 689             new->ift_oe - old->ift_oe, 1, 1);
 690         show_stat("lu", 10, "sent-bytes",
 691             new->ift_ob - old->ift_ob, 1, 0);
 692         show_stat("NRSlu", 5, "collisions",
 693             new->ift_co - old->ift_co, 1, 1);
 694         if (dflag)
 695                 show_stat("LSlu", 5, "dropped-packets",
 696                     new->ift_od - old->ift_od, 1, 1);
 697         xo_close_instance("stats");
 698         xo_emit("\n");
 699         xo_flush();
 700
 701         if (new == &ift[0]) {
 702                 new = &ift[1];
 703                 old = &ift[0];
 704         } else {
 705                 new = &ift[0];
 706                 old = &ift[1];
 707         }
 708
 709         if (line == 21)
 710                 goto banner;
 711         else
 712                 goto loop;
 713
 714         /* NOTREACHED */
 715 }