/*
 * Copyright (c) 1983, 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#)if.c     8.3 (Berkeley) 4/28/95
 * $FreeBSD: src/usr.bin/netstat/if.c,v 1.32.2.9 2001/09/17 14:35:46 ru Exp $
 */

#define _KERNEL_STRUCTURES
#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>

#include <libutil.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "netstat.h"

#define YES     1
#define NO      0

static void sidewaysintpr (u_int, u_long, int);
static void catchalarm (int);

#ifdef INET6
static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
#endif


/*
 * Display a formatted value, or a '-' in the same space.
 */
static void
show_stat(const char *fmt, int width, u_long value, short showvalue)
{
        char newfmt[32];

        if (! showvalue) {
                /* no value, just the dash */
                sprintf(newfmt, "%%%ds", width);
                printf(newfmt, "-");
                return;
        }

        if (hflag) {            /* human-readable */
                char buf[5];
                humanize_number(buf, sizeof buf, (int64_t) value, "",
                                HN_AUTOSCALE,
                                HN_NOSPACE | HN_DECIMAL);
                sprintf(newfmt, "%%%ds", width);
                printf(newfmt, buf);
        } else {
                sprintf(newfmt, "%%%d%s", width, fmt);
                printf(newfmt, value);
        }
}



/*
 * Print a description of the network interfaces.
 */
void
intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *), u_long ncpusaddr)
{
        struct ifnet ifnet;
        struct ifdata_pcpu ifdata;
        struct ifaddr_container ifac;
        struct ifnethead ifnethead;
        union {
                struct ifaddr ifa;
                struct in_ifaddr in;
#ifdef INET6
                struct in6_ifaddr in6;
#endif
        } ifaddr;
        u_long ifaddraddr;
        u_long ifaddrcont_addr;
        u_long ifaddrfound;
        u_long ifdataaddr;
        u_long opackets;
        u_long ipackets;
        u_long obytes;
        u_long ibytes;
        u_long oerrors;
        u_long ierrors;
        u_long collisions;
        u_long oqdrops;
        short timer;
        struct sockaddr *sa = NULL;
        char name[IFNAMSIZ];
        short network_layer;
        short link_layer;
        int ncpus;

        if (kread(ncpusaddr, (char *)&ncpus, sizeof(ncpus)))
                return;

        if (ifnetaddr == 0) {
                printf("ifnet: symbol not defined\n");
                return;
        }
        if (interval1) {
                sidewaysintpr((unsigned)interval1, ifnetaddr, ncpus);
                return;
        }
        if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead))
                return;
        ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
        if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
                return;

        if (!pfunc) {
                printf("%-9.9s %-5.5s %-13.13s %-15.15s %8.8s %5.5s",
                       "Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs");
                if (bflag)
                        printf(" %10.10s","Ibytes");
                printf(" %8.8s %5.5s", "Opkts", "Oerrs");
                if (bflag)
                        printf(" %10.10s","Obytes");
                printf(" %5s", "Coll");
                if (tflag)
                        printf(" %5s", "Time");
                if (dflag)
                        printf(" %5s", "Drop");
                putchar('\n');
        }
        ifaddraddr = 0;
        ifaddrcont_addr = 0;
        while (ifnetaddr || ifaddraddr) {
                struct sockaddr_in *sin;
#ifdef INET6
                struct sockaddr_in6 *sin6;
#endif
                char *cp;
                int n, m, cpu;

                network_layer = 0;
                link_layer = 0;

                if (ifaddraddr == 0) {
                        struct ifaddrhead head;

                        if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
                                return;
                        strlcpy(name, ifnet.if_xname, sizeof(name));
                        ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
                        if (interface != 0 && (strcmp(name, interface) != 0))
                                continue;
                        cp = strchr(name, '\0');

                        if (pfunc) {
                                (*pfunc)(name);
                                continue;
                        }

                        if ((ifnet.if_flags & IFF_UP) == 0)
                                *cp++ = '*';
                        *cp = '\0';

                        if (kread((u_long)ifnet.if_addrheads,
                                  (char *)&head, sizeof(head)))
                                return;

                        ifaddrcont_addr = (u_long)TAILQ_FIRST(&head);
                        if (ifaddrcont_addr == 0) {
                                ifaddraddr = 0;
                        } else {
                                if (kread(ifaddrcont_addr, (char *)&ifac,
                                          sizeof(ifac)))
                                        return;
                                ifaddraddr = (u_long)ifac.ifa;
                        }
                }
                ifaddrfound = ifaddraddr;

                /*
                 * Get the interface stats.  These may get
                 * overridden below on a per-interface basis.
                 */
                ifdataaddr = (u_long)ifnet.if_data_pcpu;
                if (kread(ifdataaddr, (char *)&ifdata, sizeof(ifdata)))
                        return;
                opackets = ifdata.ifd_opackets;
                ipackets = ifdata.ifd_ipackets;
                obytes = ifdata.ifd_obytes;
                ibytes = ifdata.ifd_ibytes;
                oerrors = ifdata.ifd_oerrors;
                ierrors = ifdata.ifd_ierrors;
                collisions = ifdata.ifd_collisions;
                oqdrops = ifdata.ifd_oqdrops;

                for (cpu = 1; cpu < ncpus; ++cpu) {
                        if (kread(ifdataaddr + (cpu * sizeof(ifdata)),
                            (char *)&ifdata, sizeof(ifdata)))
                                return;
                        opackets += ifdata.ifd_opackets;
                        ipackets += ifdata.ifd_ipackets;
                        obytes += ifdata.ifd_obytes;
                        ibytes += ifdata.ifd_ibytes;
                        oerrors += ifdata.ifd_oerrors;
                        ierrors += ifdata.ifd_ierrors;
                        collisions += ifdata.ifd_collisions;
                        oqdrops += ifdata.ifd_oqdrops;
                }

                timer = ifnet.if_timer;

                if (ifaddraddr == 0) {
                        printf("%-9.9s %-5lu ", name, ifnet.if_mtu);
                        printf("%-13.13s ", "none");
                        printf("%-15.15s ", "none");
                } else {
                        if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
                                ifaddraddr = 0;
                                continue;
                        }

                        ifaddr.ifa.if_ipackets = ifac.ifa_ipackets;
                        ifaddr.ifa.if_ibytes = ifac.ifa_ibytes;
                        ifaddr.ifa.if_opackets = ifac.ifa_opackets;
                        ifaddr.ifa.if_obytes = ifac.ifa_obytes;
                        for (cpu = 1; cpu < ncpus; ++cpu) {
                                struct ifaddr_container nifac;

                                if (kread(ifaddrcont_addr +
                                    (cpu * sizeof(nifac)),
                                    (char *)&nifac, sizeof(nifac))) {
                                        ifaddraddr = 0;
                                        continue;
                                }
                                ifaddr.ifa.if_ipackets += nifac.ifa_ipackets;
                                ifaddr.ifa.if_ibytes += nifac.ifa_ibytes;
                                ifaddr.ifa.if_opackets += nifac.ifa_opackets;
                                ifaddr.ifa.if_obytes += nifac.ifa_obytes;
                        }

#define CP(x) ((char *)(x))
                        cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
                                CP(&ifaddr);
                        sa = (struct sockaddr *)cp;
                        if (af != AF_UNSPEC && sa->sa_family != af) {
                                ifaddrcont_addr =
                                        (u_long)TAILQ_NEXT(&ifac, ifa_link);
                                if (ifaddrcont_addr == 0) {
                                        ifaddraddr = 0;
                                } else {
                                        if (kread(ifaddrcont_addr,
                                            (char *)&ifac, sizeof(ifac))) {
                                                ifaddraddr = 0;
                                                continue;
                                        }
                                        ifaddraddr = (u_long)ifac.ifa;
                                }
                                continue;
                        }
                        printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
                        switch (sa->sa_family) {
                        case AF_UNSPEC:
                                printf("%-13.13s ", "none");
                                printf("%-15.15s ", "none");
                                break;
                        case AF_INET:
                                sin = (struct sockaddr_in *)sa;
#ifdef notdef
                                /* can't use inet_makeaddr because kernel
                                 * keeps nets unshifted.
                                 */
                                in = inet_makeaddr(ifaddr.in.ia_subnet,
                                        INADDR_ANY);
                                printf("%-13.13s ", netname(in.s_addr,
                                    ifaddr.in.ia_subnetmask));
#else
                                printf("%-13.13s ",
                                    netname(htonl(ifaddr.in.ia_subnet),
                                    ifaddr.in.ia_subnetmask));
#endif
                                printf("%-15.15s ",
                                    routename(sin->sin_addr.s_addr));

                                network_layer = 1;
                                break;
#ifdef INET6
                        case AF_INET6:
                                sin6 = (struct sockaddr_in6 *)sa;
                                printf("%-11.11s ",
                                       netname6(&ifaddr.in6.ia_addr,
                                                &ifaddr.in6.ia_prefixmask.sin6_addr));
                                printf("%-17.17s ",
                                    inet_ntop(AF_INET6,
                                        &sin6->sin6_addr,
                                        ntop_buf, sizeof(ntop_buf)));

                                network_layer = 1;
                                break;
#endif /*INET6*/
                        case AF_LINK:
                                {
                                struct sockaddr_dl *sdl =
                                        (struct sockaddr_dl *)sa;
                                char linknum[10];
                                cp = (char *)LLADDR(sdl);
                                n = sdl->sdl_alen;
                                sprintf(linknum, "<Link#%hu>", sdl->sdl_index);
                                m = printf("%-11.11s ", linknum);
                                }
                                goto hexprint;
                        default:
                                m = printf("(%d)", sa->sa_family);
                                for (cp = sa->sa_len + (char *)sa;
                                        --cp > sa->sa_data && (*cp == 0);) {}
                                n = cp - sa->sa_data + 1;
                                cp = sa->sa_data;
                        hexprint:
                                while (--n >= 0)
                                        m += printf("%02x%c", *cp++ & 0xff,
                                                    n > 0 ? ':' : ' ');
                                m = 30 - m;
                                while (m-- > 0)
                                        putchar(' ');

                                link_layer = 1;
                                break;
                        }

                        /*
                         * Fixup the statistics for interfaces that
                         * update stats for their network addresses
                         */
                        if (network_layer) {
                                opackets = ifaddr.ifa.if_opackets;
                                ipackets = ifaddr.ifa.if_ipackets;
                                obytes = ifaddr.ifa.if_obytes;
                                ibytes = ifaddr.ifa.if_ibytes;
                        }

                        ifaddrcont_addr =
                                (u_long)TAILQ_NEXT(&ifac, ifa_link);
                        if (ifaddrcont_addr == 0) {
                                ifaddraddr = 0;
                        } else {
                                if (kread(ifaddrcont_addr,
                                    (char *)&ifac, sizeof(ifac))) {
                                        ifaddraddr = 0;
                                } else {
                                        ifaddraddr = (u_long)ifac.ifa;
                                }
                        }
                }

                show_stat("lu", 8, ipackets, link_layer|network_layer);
                printf(" ");
                show_stat("lu", 5, ierrors, link_layer);
                printf(" ");
                if (bflag) {
                        show_stat("lu", 10, ibytes, link_layer|network_layer);
                        printf(" ");
                }
                show_stat("lu", 8, opackets, link_layer|network_layer);
                printf(" ");
                show_stat("lu", 5, oerrors, link_layer);
                printf(" ");
                if (bflag) {
                        show_stat("lu", 10, obytes, link_layer|network_layer);
                        printf(" ");
                }
                show_stat("lu", 5, collisions, link_layer);
                if (tflag) {
                        printf(" ");
                        show_stat("d", 5, timer, link_layer);
                }
                if (dflag) {
                        printf(" ");
                        show_stat("lu", 5, oqdrops, link_layer);
                }
                putchar('\n');
                if (aflag && ifaddrfound) {
                        /*
                         * Print family's multicast addresses
                         */
                        struct ifmultiaddr *multiaddr;
                        struct ifmultiaddr ifma;
                        union {
                                struct sockaddr sa;
                                struct sockaddr_in in;
#ifdef INET6
                                struct sockaddr_in6 in6;
#endif /* INET6 */
                                struct sockaddr_dl dl;
                        } msa;
                        const char *fmt;

                        TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
                                if (kread((u_long)multiaddr, (char *)&ifma,
                                          sizeof ifma))
                                        break;
                                multiaddr = &ifma;
                                if (kread((u_long)ifma.ifma_addr, (char *)&msa,
                                          sizeof msa))
                                        break;
                                if (msa.sa.sa_family != sa->sa_family)
                                        continue;

                                fmt = NULL;
                                switch (msa.sa.sa_family) {
                                case AF_INET:
                                        fmt = routename(msa.in.sin_addr.s_addr);
                                        break;
#ifdef INET6
                                case AF_INET6:
                                        printf("%23s %-19.19s(refs: %d)\n", "",
                                               inet_ntop(AF_INET6,
                                                         &msa.in6.sin6_addr,
                                                         ntop_buf,
                                                         sizeof(ntop_buf)),
                                               ifma.ifma_refcount);
                                        break;
#endif /* INET6 */
                                case AF_LINK:
                                        switch (msa.dl.sdl_type) {
                                        case IFT_ETHER:
                                        case IFT_FDDI:
                                                fmt = ether_ntoa(
                                                        (struct ether_addr *)
                                                        LLADDR(&msa.dl));
                                                break;
                                        }
                                        break;
                                }
                                if (fmt)
                                        printf("%23s %s\n", "", fmt);
                        }
                }
        }
}

struct  iftot {
        SLIST_ENTRY(iftot) chain;
        char    ift_name[IFNAMSIZ];     /* interface name */
        u_long  ift_ip;                 /* input packets */
        u_long  ift_ie;                 /* input errors */
        u_long  ift_op;                 /* output packets */
        u_long  ift_oe;                 /* output errors */
        u_long  ift_co;                 /* collisions */
        u_long  ift_dr;                 /* drops */
        u_long  ift_ib;                 /* input bytes */
        u_long  ift_ob;                 /* output bytes */
};

u_char  signalled;                      /* set if alarm goes off "early" */

/*
 * Print a running summary of interface statistics.
 * Repeat display every interval1 seconds, showing statistics
 * collected over that interval.  Assumes that interval1 is non-zero.
 * First line printed at top of screen is always cumulative.
 * XXX - should be rewritten to use ifmib(4).
 */
static void
sidewaysintpr(unsigned interval1, u_long off, int ncpus)
{
        struct ifnet ifnet;
        u_long firstifnet;
        struct ifnethead ifnethead;
        struct ifdata_pcpu ifdata;
        struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
        int line, cpu;
        int oldmask, first;
        u_long interesting_off;
        u_long ifdata_addr;

        if (kread(off, (char *)&ifnethead, sizeof ifnethead))
                return;
        firstifnet = (u_long)TAILQ_FIRST(&ifnethead);

        if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
                printf("malloc failed\n");
                exit(1);
        }
        memset(iftot, 0, sizeof(struct iftot));

        interesting = NULL;
        interesting_off = 0;
        for (off = firstifnet, ip = iftot; off;) {
                char name[IFNAMSIZ];

                if (kread(off, (char *)&ifnet, sizeof ifnet))
                        break;
                strlcpy(name, ifnet.if_xname, sizeof(name));
                if (interface && strcmp(name, interface) == 0) {
                        interesting = ip;
                        interesting_off = off;
                }
                snprintf(ip->ift_name, 16, "(%.13s)", name);
                if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
                        printf("malloc failed\n");
                        exit(1);
                }
                memset(ipn, 0, sizeof(struct iftot));
                SLIST_NEXT(ip, chain) = ipn;
                ip = ipn;
                off = (u_long)TAILQ_NEXT(&ifnet, if_link);
        }
        if ((total = malloc(sizeof(struct iftot))) == NULL) {
                printf("malloc failed\n");
                exit(1);
        }
        memset(total, 0, sizeof(struct iftot));
        if ((sum = malloc(sizeof(struct iftot))) == NULL) {
                printf("malloc failed\n");
                exit(1);
        }
        memset(sum, 0, sizeof(struct iftot));


        (void)signal(SIGALRM, catchalarm);
        signalled = NO;
        (void)alarm(interval1);
        first = 1;
banner:
        printf("%17s %14s %16s", "input",
            interesting ? interesting->ift_name : "(Total)", "output");
        putchar('\n');
        printf("%10s %5s %10s %10s %5s %10s %5s",
            "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
        if (dflag)
                printf(" %5.5s", "drops");
        putchar('\n');
        fflush(stdout);
        line = 0;
loop:
        if (interesting != NULL) {
                ip = interesting;
                if (kread(interesting_off, (char *)&ifnet, sizeof ifnet)) {
                        printf("???\n");
                        exit(1);
                }

                ifdata_addr = (u_long)ifnet.if_data_pcpu;
                if (kread(ifdata_addr, (char *)&ifdata, sizeof(ifdata))) {
                        printf("ifdata 1\n");
                        exit(1);
                }
                ifnet.if_ipackets = ifdata.ifd_ipackets;
                ifnet.if_ierrors = ifdata.ifd_ierrors;
                ifnet.if_ibytes = ifdata.ifd_ibytes;
                ifnet.if_opackets = ifdata.ifd_opackets;
                ifnet.if_oerrors = ifdata.ifd_oerrors;
                ifnet.if_obytes = ifdata.ifd_obytes;
                ifnet.if_collisions = ifdata.ifd_collisions;
                ifnet.if_oqdrops = ifdata.ifd_oqdrops;

                for (cpu = 1; cpu < ncpus; ++cpu) {
                        if (kread(ifdata_addr + (cpu * sizeof(ifdata)),
                            (char *)&ifdata, sizeof(ifdata))) {
                                printf("ifdata 2\n");
                                exit(1);
                        }
                        ifnet.if_ipackets += ifdata.ifd_ipackets;
                        ifnet.if_ierrors += ifdata.ifd_ierrors;
                        ifnet.if_ibytes += ifdata.ifd_ibytes;
                        ifnet.if_opackets += ifdata.ifd_opackets;
                        ifnet.if_oerrors += ifdata.ifd_oerrors;
                        ifnet.if_obytes += ifdata.ifd_obytes;
                        ifnet.if_collisions += ifdata.ifd_collisions;
                        ifnet.if_oqdrops += ifdata.ifd_oqdrops;
                }

                if (!first) {
                        printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
                                ifnet.if_ipackets - ip->ift_ip,
                                ifnet.if_ierrors - ip->ift_ie,
                                ifnet.if_ibytes - ip->ift_ib,
                                ifnet.if_opackets - ip->ift_op,
                                ifnet.if_oerrors - ip->ift_oe,
                                ifnet.if_obytes - ip->ift_ob,
                                ifnet.if_collisions - ip->ift_co);
                        if (dflag)
                                printf(" %5lu", ifnet.if_oqdrops - ip->ift_dr);
                }
                ip->ift_ip = ifnet.if_ipackets;
                ip->ift_ie = ifnet.if_ierrors;
                ip->ift_ib = ifnet.if_ibytes;
                ip->ift_op = ifnet.if_opackets;
                ip->ift_oe = ifnet.if_oerrors;
                ip->ift_ob = ifnet.if_obytes;
                ip->ift_co = ifnet.if_collisions;
                ip->ift_dr = ifnet.if_oqdrops;
        } else {
                sum->ift_ip = 0;
                sum->ift_ie = 0;
                sum->ift_ib = 0;
                sum->ift_op = 0;
                sum->ift_oe = 0;
                sum->ift_ob = 0;
                sum->ift_co = 0;
                sum->ift_dr = 0;
                for (off = firstifnet, ip = iftot;
                     off && SLIST_NEXT(ip, chain) != NULL;
                     ip = SLIST_NEXT(ip, chain)) {
                        if (kread(off, (char *)&ifnet, sizeof ifnet)) {
                                off = 0;
                                continue;
                        }

                        ifdata_addr = (u_long)ifnet.if_data_pcpu;
                        if (kread(ifdata_addr, (char *)&ifdata,
                            sizeof(ifdata))) {
                                printf("ifdata 3\n");
                                exit(1);
                        }
                        ifnet.if_ipackets = ifdata.ifd_ipackets;
                        ifnet.if_ierrors = ifdata.ifd_ierrors;
                        ifnet.if_ibytes = ifdata.ifd_ibytes;
                        ifnet.if_opackets = ifdata.ifd_opackets;
                        ifnet.if_oerrors = ifdata.ifd_oerrors;
                        ifnet.if_obytes = ifdata.ifd_obytes;
                        ifnet.if_collisions = ifdata.ifd_collisions;
                        ifnet.if_oqdrops = ifdata.ifd_oqdrops;

                        for (cpu = 1; cpu < ncpus; ++cpu) {
                                if (kread(ifdata_addr + (cpu * sizeof(ifdata)),
                                    (char *)&ifdata, sizeof(ifdata))) {
                                        printf("ifdata 2\n");
                                        exit(1);
                                }
                                ifnet.if_ipackets += ifdata.ifd_ipackets;
                                ifnet.if_ierrors += ifdata.ifd_ierrors;
                                ifnet.if_ibytes += ifdata.ifd_ibytes;
                                ifnet.if_opackets += ifdata.ifd_opackets;
                                ifnet.if_oerrors += ifdata.ifd_oerrors;
                                ifnet.if_obytes += ifdata.ifd_obytes;
                                ifnet.if_collisions += ifdata.ifd_collisions;
                                ifnet.if_oqdrops += ifdata.ifd_oqdrops;
                        }

                        /*
                         * Don't double-count interfaces that are associated
                         * with bridges, they will be rolled up by the
                         * bridge.  Errors and collisions are not rolled up.
                         */
                        if (ifnet.if_bridge) {
                                sum->ift_ie += ifnet.if_ierrors;
                                sum->ift_oe += ifnet.if_oerrors;
                                sum->ift_co += ifnet.if_collisions;
                        } else {
                                sum->ift_ip += ifnet.if_ipackets;
                                sum->ift_ie += ifnet.if_ierrors;
                                sum->ift_ib += ifnet.if_ibytes;
                                sum->ift_op += ifnet.if_opackets;
                                sum->ift_oe += ifnet.if_oerrors;
                                sum->ift_ob += ifnet.if_obytes;
                                sum->ift_co += ifnet.if_collisions;
                                sum->ift_dr += ifnet.if_oqdrops;
                        }
                        off = (u_long)TAILQ_NEXT(&ifnet, if_link);
                }
                if (!first) {
                        /* %10lu %5lu %10lu %10lu %5lu %10lu %5lu */
                        show_stat("lu", 10,   sum->ift_ip - total->ift_ip, 1);
                        show_stat("lu",  5+1, sum->ift_ie - total->ift_ie, 1);
                        show_stat("lu", 10+1, sum->ift_ib - total->ift_ib, 1);
                        show_stat("lu", 10+1, sum->ift_op - total->ift_op, 1);
                        show_stat("lu",  5+1, sum->ift_oe - total->ift_oe, 1);
                        show_stat("lu", 10+1, sum->ift_ob - total->ift_ob, 1);
                        show_stat("lu",  5+1, sum->ift_co - total->ift_co, 1);
                        if (dflag)
                                show_stat("u", 5+1, sum->ift_dr - total->ift_dr, 1);
                }
                *total = *sum;
        }
        if (!first)
                putchar('\n');
        fflush(stdout);
        oldmask = sigblock(sigmask(SIGALRM));
        if (! signalled) {
                sigpause(0);
        }
        sigsetmask(oldmask);
        signalled = NO;
        (void)alarm(interval1);
        line++;
        first = 0;
        if (line == 21)
                goto banner;
        else
                goto loop;
        /*NOTREACHED*/
}

/*
 * Called if an interval expires before sidewaysintpr has completed a loop.
 * Sets a flag to not wait for the alarm.
 */
static void
catchalarm(int signo __unused)
{
        signalled = YES;
}