/*      $OpenBSD: main.c,v 1.125 2025/06/21 22:08:44 bluhm Exp $        */
/*      $NetBSD: main.c,v 1.9 1996/05/07 02:55:02 thorpej Exp $ */

/*
 * Copyright (c) 1983, 1988, 1993
 *      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.
 */

#include <sys/types.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/sysctl.h>

#include <net/route.h>
#include <netinet/in.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <netdb.h>
#include <nlist.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "netstat.h"

struct nlist nl[] = {
#define N_AFMAP         0
        { "_afmap"},
#define N_AF2IDX        1
        { "_af2idx" },
#define N_AF2IDXMAX     2
        { "_af2idx_max" },

        { "" }
};

struct protox {
        void    (*pr_stats)(char *);    /* statistics printing routine */
        char    *pr_name;               /* well-known name */
        int     pr_proto;               /* protocol number */
} protox[] = {
        { ip_stats,     "ip",   IPPROTO_IPV4 },
        { icmp_stats,   "icmp", 0 },
        { igmp_stats,   "igmp", 0 },
        { ipip_stats,   "ipencap", 0 },
        { tcp_stats,    "tcp",  IPPROTO_TCP },
        { udp_stats,    "udp",  IPPROTO_UDP },
        { ipsec_stats,  "ipsec", 0 },
        { esp_stats,    "esp", 0 },
        { ah_stats,     "ah", 0 },
        { etherip_stats,"etherip", 0 },
        { ipcomp_stats, "ipcomp", 0 },
        { carp_stats,   "carp", 0 },
        { pfsync_stats, "pfsync", 0 },
        { div_stats,    "divert", IPPROTO_DIVERT },
        { pflow_stats,  "pflow", 0 },
        { NULL,         NULL, 0 }
};

struct protox ip6protox[] = {
        { ip6_stats,    "ip6", IPPROTO_IPV6 },
        { icmp6_stats,  "icmp6", 0 },
        { rip6_stats,   "rip6", 0 },
        { NULL,         NULL, 0 }
};

struct protox *protoprotox[] = {
        protox, ip6protox, NULL
};

static void usage(void);
static struct protox *name2protox(char *);
static struct protox *knownname(char *);
void gettable(u_int);

kvm_t *kvmd;

int     Aflag;          /* show addresses of protocol control block */
int     aflag;          /* show all sockets (including servers) */
int     Bflag;          /* show TCP send and receive buffer sizes */
int     bflag;          /* show bytes instead of packets */
int     dflag;          /* show i/f dropped packets */
int     Fflag;          /* show routes whose gateways are in specified AF */
int     gflag;          /* show group (multicast) routing or stats */
int     hflag;          /* print human numbers */
int     iflag;          /* show interfaces */
int     lflag;          /* show only listening sockets (only servers), */
                        /* with -g, show routing table with use and ref */
int     mflag;          /* show memory stats */
int     nflag;          /* show addresses numerically */
int     pflag;          /* show given protocol */
int     Pflag;          /* show given PCB */
int     qflag;          /* only display non-zero values for output */
int     rflag;          /* show routing tables (or routing stats) */
int     Rflag;          /* show rdomain and rtable summary */
int     sflag;          /* show protocol statistics */
int     vflag;          /* be verbose */
int     Wflag;          /* show net80211 protocol statistics */

int     interval;       /* repeat interval for i/f stats */

char    *interface;     /* desired i/f for stats, or NULL for all i/fs */

int     af;             /* address family */

int
main(int argc, char *argv[])
{
        extern char *optarg;
        extern int optind;
        const char *errstr;
        struct protox *tp = NULL; /* for printing cblocks & stats */
        int ch;
        char *nlistf = NULL, *memf = NULL, *ep;
        char buf[_POSIX2_LINE_MAX];
        u_long pcbaddr = 0;
        u_int tableid;
        int Tflag = 0;
        int repeatcount = 0;
        int proto = 0;
        int need_nlist, kvm_flags = O_RDONLY;

        af = AF_UNSPEC;
        tableid = getrtable();

        while ((ch = getopt(argc, argv,
            "AaBbc:deFf:ghI:iLlM:mN:np:P:qRrsT:uvW:w:")) != -1)
                switch (ch) {
                case 'A':
                        Aflag = 1;
                        break;
                case 'a':
                        aflag = 1;
                        break;
                case 'B':
                        Bflag = 1;
                        break;
                case 'b':
                        bflag = 1;
                        break;
                case 'c':
                        repeatcount = strtonum(optarg, 1, INT_MAX, &errstr);
                        if (errstr)
                                errx(1, "count is %s", errstr);
                        break;
                case 'd':
                        dflag = IF_SHOW_DROP;
                        break;
                case 'e':
                        dflag = IF_SHOW_ERRS;
                        break;
                case 'F':
                        Fflag = 1;
                        break;
                case 'f':
                        if (strcmp(optarg, "inet") == 0)
                                af = AF_INET;
                        else if (strcmp(optarg, "inet6") == 0)
                                af = AF_INET6;
                        else if (strcmp(optarg, "local") == 0)
                                af = AF_LOCAL;
                        else if (strcmp(optarg, "unix") == 0)
                                af = AF_UNIX;
                        else if (strcmp(optarg, "mpls") == 0)
                                af = AF_MPLS;
                        else {
                                (void)fprintf(stderr,
                                    "%s: %s: unknown address family\n",
                                    __progname, optarg);
                                exit(1);
                        }
                        break;
                case 'g':
                        gflag = 1;
                        break;
                case 'h':
                        hflag = 1;
                        break;
                case 'I':
                        iflag = 1;
                        interface = optarg;
                        break;
                case 'i':
                        iflag = 1;
                        break;
                case 'l':
                        lflag = 1;
                        break;
                case 'M':
                        memf = optarg;
                        break;
                case 'm':
                        mflag = 1;
                        break;
                case 'N':
                        nlistf = optarg;
                        break;
                case 'n':
                        nflag = 1;
                        break;
                case 'p':
                        if ((tp = name2protox(optarg)) == NULL) {
                                (void)fprintf(stderr,
                                    "%s: %s: unknown protocol\n",
                                    __progname, optarg);
                                exit(1);
                        }
                        pflag = 1;
                        break;
                case 'P':
                        errno = 0;
                        pcbaddr = strtoul(optarg, &ep, 16);
                        if (optarg[0] == '\0' || *ep != '\0' ||
                            errno == ERANGE) {
                                (void)fprintf(stderr,
                                    "%s: %s: invalid PCB address\n",
                                    __progname, optarg);
                                exit(1);
                        }
                        Pflag = 1;
                        break;
                case 'q':
                        qflag = 1;
                        break;
                case 'R':
                        Rflag = 1;
                        break;
                case 'r':
                        rflag = 1;
                        break;
                case 's':
                        ++sflag;
                        break;
                case 'T':
                        tableid = strtonum(optarg, 0, RT_TABLEID_MAX, &errstr);
                        if (errstr)
                                errx(1, "invalid table id: %s", errstr);
                        Tflag = 1;
                        break;
                case 'u':
                        af = AF_UNIX;
                        break;
                case 'v':
                        vflag = 1;
                        break;
                case 'W':
                        Wflag = 1;
                        interface = optarg;
                        break;
                case 'w':
                        interval = strtonum(optarg, 1, INT_MAX, &errstr);
                        if (errstr)
                                errx(1, "interval is %s", errstr);
                        iflag = 1;
                        break;
                default:
                        usage();
                }
        argv += optind;
        argc -= optind;

        if (argc) {
                interval = strtonum(*argv, 1, INT_MAX, &errstr);
                if (errstr)
                        errx(1, "interval is %s", errstr);
                ++argv;
                --argc;
                iflag = 1;
        }
        if (argc)
                usage();

        /*
         * Show per-interface statistics which don't need access to
         * kernel memory (they're using IOCTLs)
         */
        if (Wflag) {
                if (interface == NULL)
                        usage();
                net80211_ifstats(interface);
                exit(0);
        }

        if (mflag) {
                mbpr();
                exit(0);
        }
        if (iflag) {
                intpr(interval, repeatcount);
                exit(0);
        }
        if (sflag) {
                if (rflag) {
                        rt_stats();
                } else if (gflag) {
                        if (af == AF_INET || af == AF_UNSPEC)
                                mrt_stats();
                        if (af == AF_INET6 || af == AF_UNSPEC)
                                mrt6_stats();
                } else if (pflag && tp->pr_name) {
                        (*tp->pr_stats)(tp->pr_name);
                } else {
                        if (af == AF_INET || af == AF_UNSPEC)
                                for (tp = protox; tp->pr_name; tp++)
                                        (*tp->pr_stats)(tp->pr_name);
                        if (af == AF_INET6 || af == AF_UNSPEC)
                                for (tp = ip6protox; tp->pr_name; tp++)
                                        (*tp->pr_stats)(tp->pr_name);
                }
                exit(0);
        }
        if (gflag) {
                if (af == AF_INET || af == AF_UNSPEC)
                        mroutepr();
                if (af == AF_INET6 || af == AF_UNSPEC)
                        mroute6pr();
                exit(0);
        }

        if (Rflag) {
                rdomainpr();
                exit(0);
        }

        /*
         * The remaining code may need kvm so lets try to open it.
         * -r and -P are the only bits left that actually can use this.
         */
        need_nlist = (nlistf != NULL) || (memf != NULL) || (Aflag && rflag);
        if (!need_nlist && !Pflag)
                kvm_flags |= KVM_NO_FILES;

        if ((kvmd = kvm_openfiles(nlistf, memf, NULL, kvm_flags, buf)) == NULL)
                errx(1, "kvm_openfiles: %s", buf);

        if (need_nlist && (kvm_nlist(kvmd, nl) < 0 || nl[0].n_type == 0)) {
                if (nlistf)
                        errx(1, "%s: no namelist", nlistf);
                else
                        errx(1, "no namelist");
        }

        if (!need_nlist && Tflag)
                gettable(tableid);

        if (rflag) {
                if (Aflag || nlistf != NULL || memf != NULL)
                        routepr(nl[N_AFMAP].n_value, nl[N_AF2IDX].n_value,
                            nl[N_AF2IDXMAX].n_value, tableid);
                else
                        p_rttables(af, tableid);
                exit(0);
        }

        if (pflag) {
                if (tp->pr_proto == 0)
                        errx(1, "no protocol handler for protocol %s",
                            tp->pr_name);
                else
                        proto = tp->pr_proto;
        }

        protopr(kvmd, pcbaddr, tableid, proto);
        exit(0);
}

/*
 * Read kernel memory, return 0 on success.
 */
int
kread(u_long addr, void *buf, int size)
{

        if (kvm_read(kvmd, addr, buf, size) != size) {
                (void)fprintf(stderr, "%s: %s\n", __progname,
                    kvm_geterr(kvmd));
                return (-1);
        }
        return (0);
}

char *
plural(u_int64_t n)
{
        return (n != 1 ? "s" : "");
}

char *
plurales(u_int64_t n)
{
        return (n != 1 ? "es" : "");
}

char *
pluralys(u_int64_t n)
{
        return (n != 1 ? "ies" : "y");
}

/*
 * Find the protox for the given "well-known" name.
 */
static struct protox *
knownname(char *name)
{
        struct protox **tpp, *tp;

        for (tpp = protoprotox; *tpp; tpp++)
                for (tp = *tpp; tp->pr_name; tp++)
                        if (strcmp(tp->pr_name, name) == 0)
                                return (tp);
        return (NULL);
}

/*
 * Find the protox corresponding to name.
 */
static struct protox *
name2protox(char *name)
{
        struct protox *tp;
        char **alias;                   /* alias from p->aliases */
        struct protoent *p;

        /*
         * Try to find the name in the list of "well-known" names. If that
         * fails, check if name is an alias for an Internet protocol.
         */
        if ((tp = knownname(name)))
                return (tp);

        setprotoent(1);                 /* make protocol lookup cheaper */
        while ((p = getprotoent())) {
                /* assert: name not same as p->name */
                for (alias = p->p_aliases; *alias; alias++)
                        if (strcmp(name, *alias) == 0) {
                                endprotoent();
                                return (knownname(p->p_name));
                        }
        }
        endprotoent();
        return (NULL);
}

static void
usage(void)
{
        (void)fprintf(stderr,
            "usage: netstat [-AaBln] [-M core] [-N system] [-p protocol] [-T rtable]\n"
            "       netstat -W interface\n"
            "       netstat -m\n"
            "       netstat -I interface | -i [-bdehnq]\n"
            "       netstat -w wait [-bdehnq] [-c count] [-I interface]\n"
            "       netstat -s [-gru] [-f address_family] [-p protocol]\n"
            "       netstat -g [-lnu] [-f address_family]\n"
            "       netstat -R\n"
            "       netstat -r [-AFu] [-f address_family] [-M core] [-N system] [-T rtable]\n"
            "       netstat -P pcbaddr [-v] [-M core] [-N system]\n");
        exit(1);
}

void
gettable(u_int tableid)
{
        struct rt_tableinfo info;
        int mib[6];
        size_t len;

        mib[0] = CTL_NET;
        mib[1] = PF_ROUTE;
        mib[2] = 0;
        mib[3] = 0;
        mib[4] = NET_RT_TABLE;
        mib[5] = tableid;

        len = sizeof(info);
        if (sysctl(mib, 6, &info, &len, NULL, 0) == -1)
                err(1, "routing table %d", tableid);
}