netstat.tproj/if.c

   1 /*
   2  * Copyright (c) 2008 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1983, 1988, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61 #ifndef lint
  62 /*
  63 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  64 */
  65 static const char rcsid[] =
  66         "$Id: if.c,v 1.7 2006/01/16 04:53:59 lindak Exp $";
  67 #endif /* not lint */
  68
  69 #include <sys/types.h>
  70 #include <sys/socket.h>
  71 #include <sys/sysctl.h>
  72 #include <sys/time.h>
  73
  74 #include <net/if.h>
  75 #include <net/if_var.h>
  76 #include <net/if_dl.h>
  77 #include <net/if_types.h>
  78 #include <net/if_mib.h>
  79 #include <net/ethernet.h>
  80 #include <net/route.h>
  81
  82 #include <netinet/in.h>
  83 #include <netinet/in_var.h>
  84
  85 #include <arpa/inet.h>
  86
  87 #include <signal.h>
  88 #include <stdio.h>
  89 #include <string.h>
  90 #include <unistd.h>
  91 #include <stdlib.h>
  92 #include <err.h>
  93
  94 #include "netstat.h"
  95
  96 #define YES     1
  97 #define NO      0
  98
  99 #define ROUNDUP(a, size) (((a) & ((size) - 1)) ? (1 + ((a)|(size - 1))) : (a))
 100
 101 #define NEXT_SA(p) (struct sockaddr *) \
 102     ((caddr_t)p + (p->sa_len ? ROUNDUP(p->sa_len, sizeof(uint32_t)) : \
 103     sizeof(uint32_t)))
 104
 105 static void sidewaysintpr ();
 106 static void catchalarm (int);
 107
 108 #ifdef INET6
 109 char *netname6 (struct sockaddr_in6 *, struct sockaddr *);
 110 static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
 111 #endif
 112
 113 /*
 114  * Display a formatted value, or a '-' in the same space.
 115  */
 116 static void
 117 show_stat(const char *fmt, int width, u_int64_t value, short showvalue)
 118 {
 119         char newfmt[32];
 120
 121         /* Construct the format string */
 122         if (showvalue) {
 123                 sprintf(newfmt, "%%%d%s", width, fmt);
 124                 printf(newfmt, value);
 125         } else {
 126                 sprintf(newfmt, "%%%ds", width);
 127                 printf(newfmt, "-");
 128         }
 129 }
 130
 131 size_t
 132 get_rti_info(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 133 {
 134     int                 i;
 135     size_t              len = 0;
 136
 137     for (i = 0; i < RTAX_MAX; i++) {
 138         if (addrs & (1 << i)) {
 139             rti_info[i] = sa;
 140             if (sa->sa_len < sizeof(struct sockaddr))
 141                 len += sizeof(struct sockaddr);
 142             else
 143                 len += sa->sa_len;
 144             sa = NEXT_SA(sa);
 145         } else {
 146             rti_info[i] = NULL;
 147         }
 148     }
 149     return len;
 150 }
 151
 152 static void
 153 multipr(int family, char *buf, char *lim)
 154 {
 155     char  *next;
 156
 157     for (next = buf; next < lim; ) {
 158                 struct ifma_msghdr2     *ifmam = (struct ifma_msghdr2 *)next;
 159                 struct sockaddr *rti_info[RTAX_MAX];
 160                 struct sockaddr *sa;
 161                 const char *fmt = 0;
 162
 163                 next += ifmam->ifmam_msglen;
 164                 if (ifmam->ifmam_type == RTM_IFINFO2)
 165                         break;
 166                 else if (ifmam->ifmam_type != RTM_NEWMADDR2)
 167                         continue;
 168                 get_rti_info(ifmam->ifmam_addrs, (struct sockaddr*)(ifmam + 1), rti_info);
 169                 sa = rti_info[RTAX_IFA];
 170
 171                 if (sa->sa_family != family)
 172                         continue;
 173                 switch (sa->sa_family) {
 174                         case AF_INET: {
 175                                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 176
 177                                 fmt = routename(sin->sin_addr.s_addr);
 178                                 break;
 179                         }
 180         #ifdef INET6
 181                         case AF_INET6: {
 182                                 struct sockaddr_in6 sin6;
 183
 184                                 memcpy(&sin6, sa, sizeof(struct sockaddr_in6));
 185
 186                                 if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
 187                                         IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) {
 188                                         sin6.sin6_scope_id = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 189                                         sin6.sin6_addr.s6_addr[2] = 0;
 190                                         sin6.sin6_addr.s6_addr[3] = 0;
 191                                 }
 192
 193                                 printf("%23s %-19.19s(refs: %d)\n", "",
 194                                     inet_ntop(AF_INET6, &sin6.sin6_addr,
 195                                     ntop_buf, sizeof(ntop_buf)),
 196                                                 ifmam->ifmam_refcount);
 197                                 break;
 198                         }
 199         #endif /* INET6 */
 200                         case AF_LINK: {
 201                                 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
 202
 203                                 switch (sdl->sdl_type) {
 204                                 case IFT_ETHER:
 205                                 case IFT_FDDI:
 206                                         fmt = ether_ntoa((struct ether_addr *)
 207                                                 LLADDR(sdl));
 208                                         break;
 209                                 }
 210                                 break;
 211                         }
 212                 }
 213                 if (fmt)
 214                         printf("%23s %s\n", "", fmt);
 215         }
 216 }
 217
 218 /*
 219  * Print a description of the network interfaces.
 220  */
 221 void
 222 intpr(void (*pfunc)(char *))
 223 {
 224         u_int64_t opackets = 0;
 225         u_int64_t ipackets = 0;
 226         u_int64_t obytes = 0;
 227         u_int64_t ibytes = 0;
 228         u_int64_t oerrors = 0;
 229         u_int64_t ierrors = 0;
 230         u_int64_t collisions = 0;
 231         uint32_t mtu = 0;
 232         short timer = 0;
 233         int drops = 0;
 234         struct sockaddr *sa = NULL;
 235         char name[32];
 236         short network_layer;
 237         short link_layer;
 238     int mib[6];
 239     char *buf = NULL, *lim, *next;
 240         size_t len;
 241         struct if_msghdr *ifm;
 242         struct sockaddr *rti_info[RTAX_MAX];
 243         unsigned int ifindex = 0;
 244
 245         if (interval) {
 246                 sidewaysintpr();
 247                 return;
 248         }
 249
 250         if (interface != 0)
 251                 ifindex = if_nametoindex(interface);
 252
 253         mib[0]  = CTL_NET;                      // networking subsystem
 254         mib[1]  = PF_ROUTE;                     // type of information
 255         mib[2]  = 0;                            // protocol (IPPROTO_xxx)
 256         mib[3]  = 0;                            // address family
 257         mib[4]  = NET_RT_IFLIST2;       // operation
 258         mib[5]  = 0;
 259         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 260                 return;
 261         if ((buf = malloc(len)) == NULL) {
 262                 printf("malloc failed\n");
 263                 exit(1);
 264         }
 265         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 266                 if (buf)
 267                         free(buf);
 268                 return;
 269         }
 270         if (!pfunc) {
 271                 printf("%-5.5s %-5.5s %-13.13s %-15.15s %8.8s %5.5s",
 272                        "Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs");
 273                 if (bflag)
 274                         printf(" %10.10s","Ibytes");
 275                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 276                 if (bflag)
 277                         printf(" %10.10s","Obytes");
 278                 printf(" %5s", "Coll");
 279                 if (tflag)
 280                         printf(" %s", "Time");
 281                 if (dflag)
 282                         printf(" %s", "Drop");
 283                 putchar('\n');
 284         }
 285     lim = buf + len;
 286     for (next = buf; next < lim; ) {
 287                 char *cp;
 288                 int n, m;
 289
 290                 network_layer = 0;
 291                 link_layer = 0;
 292         ifm = (struct if_msghdr *)next;
 293                 next += ifm->ifm_msglen;
 294
 295         if (ifm->ifm_type == RTM_IFINFO2) {
 296                         struct if_msghdr2 *if2m = (struct if_msghdr2 *)ifm;
 297             struct sockaddr_dl  *sdl = (struct sockaddr_dl *)(if2m + 1);
 298
 299                         strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
 300                         name[sdl->sdl_nlen] = 0;
 301                         if (interface != 0 && if2m->ifm_index != ifindex)
 302                                 continue;
 303                         cp = index(name, '\0');
 304
 305                         if (pfunc) {
 306                                 (*pfunc)(name);
 307                                 continue;
 308                         }
 309
 310                         if ((if2m->ifm_flags & IFF_UP) == 0)
 311                                 *cp++ = '*';
 312                         *cp = '\0';
 313
 314                         /*
 315                          * Get the interface stats.  These may get
 316                          * overriden below on a per-interface basis.
 317                          */
 318                         opackets = if2m->ifm_data.ifi_opackets;
 319                         ipackets = if2m->ifm_data.ifi_ipackets;
 320                         obytes = if2m->ifm_data.ifi_obytes;
 321                         ibytes = if2m->ifm_data.ifi_ibytes;
 322                         oerrors =if2m->ifm_data.ifi_oerrors;
 323                         ierrors = if2m->ifm_data.ifi_ierrors;
 324                         collisions = if2m->ifm_data.ifi_collisions;
 325                         timer = if2m->ifm_timer;
 326                         drops = if2m->ifm_snd_drops;
 327                         mtu = if2m->ifm_data.ifi_mtu;
 328
 329             get_rti_info(if2m->ifm_addrs, (struct sockaddr*)(if2m + 1), rti_info);
 330                         sa = rti_info[RTAX_IFP];
 331         } else if (ifm->ifm_type == RTM_NEWADDR) {
 332             struct ifa_msghdr   *ifam = (struct ifa_msghdr *)ifm;
 333
 334                         if (interface != 0 && ifam->ifam_index != ifindex)
 335                                 continue;
 336             get_rti_info(ifam->ifam_addrs, (struct sockaddr*)(ifam + 1), rti_info);
 337                         sa = rti_info[RTAX_IFA];
 338                 } else {
 339                         continue;
 340                 }
 341                 printf("%-5.5s %-5u ", name, mtu);
 342
 343                 if (sa == 0) {
 344                         printf("%-13.13s ", "none");
 345                         printf("%-15.15s ", "none");
 346                 } else {
 347                         switch (sa->sa_family) {
 348                         case AF_UNSPEC:
 349                                 printf("%-13.13s ", "none");
 350                                 printf("%-15.15s ", "none");
 351                                 break;
 352
 353                         case AF_INET: {
 354                                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 355                                 struct sockaddr_in mask;
 356
 357                                 mask.sin_addr.s_addr = 0;
 358                                 memcpy(&mask,
 359                                        rti_info[RTAX_NETMASK],
 360                                        ((struct sockaddr_in *)rti_info[RTAX_NETMASK])->sin_len);
 361
 362                                 printf("%-13.13s ",
 363                                        netname(sin->sin_addr.s_addr & mask.sin_addr.s_addr,
 364                                     ntohl(mask.sin_addr.s_addr)));
 365
 366                                 printf("%-15.15s ",
 367                                     routename(sin->sin_addr.s_addr));
 368
 369                                 network_layer = 1;
 370                                 break;
 371                         }
 372 #ifdef INET6
 373                         case AF_INET6: {
 374                                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 375                                 struct sockaddr *mask = (struct sockaddr *)rti_info[RTAX_NETMASK];
 376
 377                                 printf("%-11.11s ",
 378                                        netname6(sin6,
 379                                                 mask));
 380                                 printf("%-17.17s ",
 381                                     (char *)inet_ntop(AF_INET6,
 382                                         &sin6->sin6_addr,
 383                                         ntop_buf, sizeof(ntop_buf)));
 384
 385                                 network_layer = 1;
 386                                 break;
 387                         }
 388 #endif /*INET6*/
 389                         case AF_LINK: {
 390                                 struct sockaddr_dl *sdl =
 391                                         (struct sockaddr_dl *)sa;
 392                                 char linknum[10];
 393                                 cp = (char *)LLADDR(sdl);
 394                                 n = sdl->sdl_alen;
 395                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 396                                 m = printf("%-11.11s ", linknum);
 397                                 goto hexprint;
 398                         }
 399
 400                         default:
 401                                 m = printf("(%d)", sa->sa_family);
 402                                 for (cp = sa->sa_len + (char *)sa;
 403                                         --cp > sa->sa_data && (*cp == 0);) {}
 404                                 n = cp - sa->sa_data + 1;
 405                                 cp = sa->sa_data;
 406                         hexprint:
 407                                 while (--n >= 0)
 408                                         m += printf("%02x%c", *cp++ & 0xff,
 409                                                     n > 0 ? ':' : ' ');
 410                                 m = 30 - m;
 411                                 while (m-- > 0)
 412                                         putchar(' ');
 413
 414                                 link_layer = 1;
 415                                 break;
 416                         }
 417                         }
 418
 419                 show_stat("llu", 8, ipackets, link_layer|network_layer);
 420                 printf(" ");
 421                 show_stat("llu", 5, ierrors, link_layer);
 422                 printf(" ");
 423                 if (bflag) {
 424                         show_stat("llu", 10, ibytes, link_layer|network_layer);
 425                         printf(" ");
 426                 }
 427                 show_stat("llu", 8, opackets, link_layer|network_layer);
 428                 printf(" ");
 429                 show_stat("llu", 5, oerrors, link_layer);
 430                 printf(" ");
 431                 if (bflag) {
 432                         show_stat("llu", 10, obytes, link_layer|network_layer);
 433                         printf(" ");
 434                 }
 435                 show_stat("llu", 5, collisions, link_layer);
 436                 if (tflag) {
 437                         printf(" ");
 438                         show_stat("ll", 3, timer, link_layer);
 439                 }
 440                 if (dflag) {
 441                         printf(" ");
 442                         show_stat("ll", 3, drops, link_layer);
 443                 }
 444                 putchar('\n');
 445
 446                 if (aflag)
 447                         multipr(sa->sa_family, next, lim);
 448         }
 449 }
 450
 451 struct  iftot {
 452         SLIST_ENTRY(iftot) chain;
 453         char            ift_name[16];   /* interface name */
 454         u_int64_t       ift_ip;                 /* input packets */
 455         u_int64_t       ift_ie;                 /* input errors */
 456         u_int64_t       ift_op;                 /* output packets */
 457         u_int64_t       ift_oe;                 /* output errors */
 458         u_int64_t       ift_co;                 /* collisions */
 459         u_int64_t       ift_dr;                 /* drops */
 460         u_int64_t       ift_ib;                 /* input bytes */
 461         u_int64_t       ift_ob;                 /* output bytes */
 462 };
 463
 464 u_char  signalled;                      /* set if alarm goes off "early" */
 465
 466 /*
 467  * Print a running summary of interface statistics.
 468  * Repeat display every interval seconds, showing statistics
 469  * collected over that interval.  Assumes that interval is non-zero.
 470  * First line printed at top of screen is always cumulative.
 471  * XXX - should be rewritten to use ifmib(4).
 472  */
 473 static void
 474 sidewaysintpr()
 475 {
 476         struct iftot *total, *sum, *interesting;
 477         register int line;
 478         int first;
 479         int name[6];
 480         size_t len;
 481         unsigned int ifcount, i;
 482         struct ifmibdata *ifmdall = 0;
 483         int interesting_row;
 484         sigset_t sigset, oldsigset;
 485         struct itimerval timer_interval;
 486
 487
 488         /* Common OID prefix */
 489         name[0] = CTL_NET;
 490         name[1] = PF_LINK;
 491         name[2] = NETLINK_GENERIC;
 492
 493         len = sizeof(int);
 494         name[3] = IFMIB_SYSTEM;
 495         name[4] = IFMIB_IFCOUNT;
 496         if (sysctl(name, 5, &ifcount, &len, 0, 0) == 1)
 497                 err(1, "sysctl IFMIB_IFCOUNT");
 498
 499         len = ifcount * sizeof(struct ifmibdata);
 500         ifmdall = malloc(len);
 501         if (ifmdall == 0)
 502                 err(1, "malloc failed");
 503         name[3] = IFMIB_IFALLDATA;
 504         name[4] = 0;
 505         name[5] = IFDATA_GENERAL;
 506         if (sysctl(name, 6, ifmdall, &len, (void *)0, 0) == -1)
 507                 err(1, "sysctl IFMIB_IFALLDATA");
 508
 509         interesting = NULL;
 510         interesting_row = 0;
 511         for (i = 0; i < ifcount; i++) {
 512                 struct ifmibdata *ifmd = ifmdall + i;
 513
 514                 if (interface && strcmp(ifmd->ifmd_name, interface) == 0) {
 515                         if ((interesting = calloc(ifcount, sizeof(struct iftot))) == NULL)
 516                                 err(1, "malloc failed");
 517                         interesting_row = i + 1;
 518                         snprintf(interesting->ift_name, 16, "(%s)", ifmd->ifmd_name);;
 519                 }
 520         }
 521         if ((total = calloc(1, sizeof(struct iftot))) == NULL)
 522                 err(1, "malloc failed");
 523
 524         if ((sum = calloc(1, sizeof(struct iftot))) == NULL)
 525                 err(1, "malloc failed");
 526
 527         /* create a timer that fires repeatedly every interval seconds */
 528         timer_interval.it_value.tv_sec = interval;
 529         timer_interval.it_value.tv_usec = 0;
 530         timer_interval.it_interval.tv_sec = interval;
 531         timer_interval.it_interval.tv_usec = 0;
 532         (void)signal(SIGALRM, catchalarm);
 533         signalled = NO;
 534         (void)setitimer(ITIMER_REAL, &timer_interval, NULL);
 535         first = 1;
 536 banner:
 537         printf("%17s %14s %16s", "input",
 538             interesting ? interesting->ift_name : "(Total)", "output");
 539         putchar('\n');
 540         printf("%10s %5s %10s %10s %5s %10s %5s",
 541             "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
 542         if (dflag)
 543                 printf(" %5.5s", "drops");
 544         putchar('\n');
 545         fflush(stdout);
 546         line = 0;
 547 loop:
 548         if (interesting != NULL) {
 549                 struct ifmibdata ifmd;
 550
 551                 len = sizeof(struct ifmibdata);
 552                 name[3] = IFMIB_IFDATA;
 553                 name[4] = interesting_row;
 554                 name[5] = IFDATA_GENERAL;
 555                 if (sysctl(name, 6, &ifmd, &len, (void *)0, 0) == -1)
 556                         err(1, "sysctl IFDATA_GENERAL %d", interesting_row);
 557
 558                 if (!first) {
 559                         printf("%10llu %5llu %10llu %10llu %5llu %10llu %5llu",
 560                                 ifmd.ifmd_data.ifi_ipackets - interesting->ift_ip,
 561                                 ifmd.ifmd_data.ifi_ierrors - interesting->ift_ie,
 562                                 ifmd.ifmd_data.ifi_ibytes - interesting->ift_ib,
 563                                 ifmd.ifmd_data.ifi_opackets - interesting->ift_op,
 564                                 ifmd.ifmd_data.ifi_oerrors - interesting->ift_oe,
 565                                 ifmd.ifmd_data.ifi_obytes - interesting->ift_ob,
 566                                 ifmd.ifmd_data.ifi_collisions - interesting->ift_co);
 567                         if (dflag)
 568                                 printf(" %5llu", ifmd.ifmd_snd_drops - interesting->ift_dr);
 569                 }
 570                 interesting->ift_ip = ifmd.ifmd_data.ifi_ipackets;
 571                 interesting->ift_ie = ifmd.ifmd_data.ifi_ierrors;
 572                 interesting->ift_ib = ifmd.ifmd_data.ifi_ibytes;
 573                 interesting->ift_op = ifmd.ifmd_data.ifi_opackets;
 574                 interesting->ift_oe = ifmd.ifmd_data.ifi_oerrors;
 575                 interesting->ift_ob = ifmd.ifmd_data.ifi_obytes;
 576                 interesting->ift_co = ifmd.ifmd_data.ifi_collisions;
 577                 interesting->ift_dr = ifmd.ifmd_snd_drops;
 578         } else {
 579                 unsigned int latest_ifcount;
 580
 581                 len = sizeof(int);
 582                 name[3] = IFMIB_SYSTEM;
 583                 name[4] = IFMIB_IFCOUNT;
 584                 if (sysctl(name, 5, &latest_ifcount, &len, 0, 0) == 1)
 585                         err(1, "sysctl IFMIB_IFCOUNT");
 586                 if (latest_ifcount > ifcount) {
 587                         ifcount = latest_ifcount;
 588                         len = ifcount * sizeof(struct ifmibdata);
 589                         free(ifmdall);
 590                         ifmdall = malloc(len);
 591                         if (ifmdall == 0)
 592                                 err(1, "malloc failed");
 593                 } else if (latest_ifcount > ifcount) {
 594                         ifcount = latest_ifcount;
 595                         len = ifcount * sizeof(struct ifmibdata);
 596                 }
 597                 len = ifcount * sizeof(struct ifmibdata);
 598                 name[3] = IFMIB_IFALLDATA;
 599                 name[4] = 0;
 600                 name[5] = IFDATA_GENERAL;
 601                 if (sysctl(name, 6, ifmdall, &len, (void *)0, 0) == -1)
 602                         err(1, "sysctl IFMIB_IFALLDATA");
 603
 604                 sum->ift_ip = 0;
 605                 sum->ift_ie = 0;
 606                 sum->ift_ib = 0;
 607                 sum->ift_op = 0;
 608                 sum->ift_oe = 0;
 609                 sum->ift_ob = 0;
 610                 sum->ift_co = 0;
 611                 sum->ift_dr = 0;
 612                 for (i = 0; i < ifcount; i++) {
 613                         struct ifmibdata *ifmd = ifmdall + i;
 614
 615                         sum->ift_ip += ifmd->ifmd_data.ifi_ipackets;
 616                         sum->ift_ie += ifmd->ifmd_data.ifi_ierrors;
 617                         sum->ift_ib += ifmd->ifmd_data.ifi_ibytes;
 618                         sum->ift_op += ifmd->ifmd_data.ifi_opackets;
 619                         sum->ift_oe += ifmd->ifmd_data.ifi_oerrors;
 620                         sum->ift_ob += ifmd->ifmd_data.ifi_obytes;
 621                         sum->ift_co += ifmd->ifmd_data.ifi_collisions;
 622                         sum->ift_dr += ifmd->ifmd_snd_drops;
 623                 }
 624                 if (!first) {
 625                         printf("%10llu %5llu %10llu %10llu %5llu %10llu %5llu",
 626                                 sum->ift_ip - total->ift_ip,
 627                                 sum->ift_ie - total->ift_ie,
 628                                 sum->ift_ib - total->ift_ib,
 629                                 sum->ift_op - total->ift_op,
 630                                 sum->ift_oe - total->ift_oe,
 631                                 sum->ift_ob - total->ift_ob,
 632                                 sum->ift_co - total->ift_co);
 633                         if (dflag)
 634                                 printf(" %5llu", sum->ift_dr - total->ift_dr);
 635                 }
 636                 *total = *sum;
 637         }
 638         if (!first)
 639                 putchar('\n');
 640         fflush(stdout);
 641         sigemptyset(&sigset);
 642         sigaddset(&sigset, SIGALRM);
 643         (void)sigprocmask(SIG_BLOCK, &sigset, &oldsigset);
 644         if (!signalled) {
 645             sigemptyset(&sigset);
 646             sigsuspend(&sigset);
 647         }
 648         (void)sigprocmask(SIG_SETMASK, &oldsigset, NULL);
 649
 650         signalled = NO;
 651         line++;
 652         first = 0;
 653         if (line == 21)
 654                 goto banner;
 655         else
 656                 goto loop;
 657         /*NOTREACHED*/
 658 }
 659
 660 void
 661 intervalpr(void (*pr)(uint32_t, char *, int), uint32_t off, char *name , int af)
 662 {
 663         struct itimerval timer_interval;
 664         sigset_t sigset, oldsigset;
 665
 666         /* create a timer that fires repeatedly every interval seconds */
 667         timer_interval.it_value.tv_sec = interval;
 668         timer_interval.it_value.tv_usec = 0;
 669         timer_interval.it_interval.tv_sec = interval;
 670         timer_interval.it_interval.tv_usec = 0;
 671         (void) signal(SIGALRM, catchalarm);
 672         signalled = NO;
 673         (void) setitimer(ITIMER_REAL, &timer_interval, NULL);
 674
 675         for (;;) {
 676                 pr(off, name, af);
 677
 678                 fflush(stdout);
 679                 sigemptyset(&sigset);
 680                 sigaddset(&sigset, SIGALRM);
 681                 (void) sigprocmask(SIG_BLOCK, &sigset, &oldsigset);
 682                 if (!signalled) {
 683                         sigemptyset(&sigset);
 684                         sigsuspend(&sigset);
 685                 }
 686                 (void) sigprocmask(SIG_SETMASK, &oldsigset, NULL);
 687                 signalled = NO;
 688         }
 689 }
 690
 691 /*
 692  * Called if an interval expires before sidewaysintpr has completed a loop.
 693  * Sets a flag to not wait for the alarm.
 694  */
 695 static void
 696 catchalarm(int signo )
 697 {
 698         signalled = YES;
 699 }