/*
 * $OpenBSD: main.c,v 1.52 2005/02/10 14:25:08 itojun 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.
 */

#ifndef lint
char            copyright[] = "@(#) Copyright (c) 1983, 1988, 1993\n\
	Regents of the University of California.  All rights reserved.\n";
#endif                          /* not lint */

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/utilities.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif

#include "main.h"
#include "netstat.h"

#ifdef HAVE_WINSOCK_H
#include "winstub.h"
#endif

int             aflag;          /* show all sockets (including servers) */
int             bflag;          /* show bytes instead of packets */
int             dflag;          /* show i/f dropped packets */
int             gflag;          /* show group (multicast) routing or stats */
int             iflag;          /* show interfaces */
int             lflag;          /* show routing table with use and ref */
int             Lflag;          /* Legacy mibs */
int             mflag;          /* show memory stats */
int             nflag;          /* show addresses numerically */
int             oflag;          /* Open/Net-BSD style octet output */
int             pflag;          /* show given protocol */
int             qflag;          /* only display non-zero values for output */
int             rflag;          /* show routing tables (or routing stats) */
int             Sflag;          /* show source address in routing table */
int             sflag;          /* show protocol statistics */
int             tflag;          /* show i/f watchdog timers */
int             vflag;          /* be verbose */


int             interval;       /* repeat interval for i/f stats */
char           *intrface;       /* desired i/f for stats, or NULL for all i/fs */
int             af;             /* address family */
int             max_getbulk = 32;       /* specifies the max-repeaters value to use with GETBULK requests */

char           *progname = NULL;
const char     *pname;
/*
 * struct nlist nl[] - Omitted
 */

typedef void    (stringfun) (const char *);

struct protox {
    /*
     * pr_index/pr_sindex - Omitted
     */
    int             pr_wanted;  /* 1 if wanted, 0 otherwise */
    stringfun      *pr_cblocks; /* control blocks printing routine */
    stringfun      *pr_stats;   /* statistics printing routine */
    const char     *pr_name;    /* well-known name */
};

struct protox   protox[] = {
    {1, tcpprotopr, tcp_stats, "tcp"},
    {1, udpprotopr, udp_stats, "udp"},

    {1, (stringfun *) 0, ip_stats, "ip"},       /* protopr Omitted */
    {1, (stringfun *) 0, icmp_stats, "icmp"},
    /*
     * igmp/ah/esp/ipencap/etherip/ipcomp/carp/pfsync/pim - Omitted
     */
    {0, (stringfun *) 0, (stringfun *) 0, NULL}
};

struct protox   ip6protox[] = {
    {1, tcp6protopr, (stringfun *) 0, "tcp6"},
    {1, udp6protopr, (stringfun *) 0, "udp6"},

    {1, (stringfun *) 0, ip6_stats, "ip6"},     /* ip6protopr Omitted */
    {1, (stringfun *) 0, icmp6_stats, "icmp6"},
    /*
     * pim6/rip6 - Omitted
     */
    {0, (stringfun *) 0, (stringfun *) 0, NULL}
};

struct protox   ipxprotox[] = {
    {1, tcpxprotopr, tcp_stats, "tcp"},
    {1, udpxprotopr, udp_stats, "udp"},
    {1, (stringfun *) 0, ipx_stats, "ip"},      /* ip6protopr Omitted */
    {1, (stringfun *) 0, ipx_stats, "ip6"},     /* ip6protopr Omitted */
    {1, (stringfun *) 0, icmpx_stats, "icmp"},
    {1, (stringfun *) 0, icmpx_stats, "icmp6"},
    {0, (stringfun *) 0, (stringfun *) 0, NULL}
};

/*
 * {ipx,ns,atalk}protox Omitted
 */

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

static void     printproto(struct protox *, const char *);
static void     usage(void);
static struct protox *name2protox(const char *);
static struct protox *knownname(const char *);

netsnmp_session *ss;
struct protox  *tp = NULL;      /* for printing cblocks & stats */

static void
optProc(int argc, char *const *argv, int opt)
{
    switch (opt) {
    case 'C':
        while (*optarg) {
            switch (*optarg++) {
            case 'a':
                aflag = 1;
                break;
            case 'b':
                bflag = 1;
                break;
            case 'd':
                dflag = 1;
                break;
            case 'f':
                if (!*optarg)
                    optarg = argv[optind++];
                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, "ipx") == 0)
                 * af = AF_IPX;
                 * else if (strcmp(optarg, "ns") == 0)
                 * af = AF_NS;
                 * else if (strcmp(optarg, "encap") == 0)
                 * af = PF_KEY;
                 * else if (strcmp(optarg, "atalk") == 0)
                 * af = AF_APPLETALK;
                 */
                else {
                    (void) fprintf(stderr,
                                   "%s: %s: unknown address family\n",
                                   progname, optarg);
                    exit(1);
                }
                return;
            case 'g':
                gflag = 1;
                break;
            case 'I':
                iflag = 1;
                if (!*optarg)
                    optarg = argv[optind++];
                intrface = optarg;
                return;
            case 'i':
                iflag = 1;
                break;
            case 'L':
                Lflag = 1;
                break;
                /*
                 * case 'L':            FreeBSD: Display listen queue lengths
                 * NetBSD:  Suppress link-level routes
                 */
                /*
                 * case 'l':            OpenBSD: Wider IPv6 display
                 * Linux:   Listening sockets only
                 * lflag = 1;
                 * break;
                 * case 'M':            *BSD:    Memory image
                 * Linux:   Masqueraded connections
                 * memf = optarg;
                 * break;
                 */
            case 'm':
                mflag = 1;
                break;
                /*
                 * case 'N':            *BSD:    Kernel image
                 * nlistf = optarg;
                 * break;
                 */
            case 'n':
                nflag = 1;
                break;
            case 'o':
                oflag = 1;
                break;
                /*
                 * case 'P':            NetBSD:
                 * OpenBSD: dump PCB block
                 */
            case 'p':
                if (!*optarg)
                    optarg = argv[optind++];
                if ((tp = name2protox(optarg)) == NULL) {
                    (void) fprintf(stderr,
                                   "%s: %s: unknown protocol\n",
                                   progname, optarg);
                    exit(1);
                }
                pflag = 1;
                pname = tp->pr_name;
                return;
                /*
                 * case 'q':            NetBSD:  IRQ information
                 * OpenBSD: Suppress inactive I/Fs
                 * qflag = 1;
                 * break;
                 */
            case 'r':
                rflag = 1;
                break;
            case 'R':
                if (optind < argc) {
                    if (argv[optind]) {
                        max_getbulk = atoi(argv[optind]);
                        if (max_getbulk == 0) {
                            usage();
                            fprintf(stderr, "Bad -CR option: %s\n",
                                    argv[optind]);
                            exit(1);
                        }
                    }
                } else {
                    usage();
                    fprintf(stderr, "Bad -CR option: no argument given\n");
                    exit(1);
                }
                optind++;
                break;
            case 'S':          /* FreeBSD:
                                 * NetBSD:  Semi-numeric display
                                 * OpenBSD: Show route source selector */
                Sflag = 1;
                break;
            case 's':
                ++sflag;
                break;
                /*
                 * case 't':            FreeBSD:
                 * OpenBSD: Display watchdog timers
                 * tflag = 1;
                 * break;
                 * case 'u':            OpenBSD: unix sockets only
                 * af = AF_UNIX;
                 * break;
                 */
            case 'v':
                vflag = 1;
                break;
            case 'w':
                if (!*optarg)
                    optarg = argv[optind++];
                interval = atoi(optarg);
                iflag = 1;
                return;
            case '?':
            default:
                usage();
                exit(1);
            }
        }
        break;                  /* End of '-Cx' switch */

        /*
         *  Backward compatibility for the main display modes
         *    (where this doesn't clash with standard SNMP flags)
         */
    case 'i':
        iflag = 1;
        break;
    case 'R':
        rflag = 1;              /* -r sets the retry count */
        break;
    case 's':
        ++sflag;
        break;
    }
}

int
main(int argc, char *argv[])
{
    netsnmp_session session;
    struct protoent *p;
    char           *cp;
    int             exit_code = 1;

    SOCK_STARTUP;

    af = AF_UNSPEC;
    cp = strrchr(argv[0], '/');
    if (cp)
        progname = cp + 1;
    else
        progname = argv[0];

    switch (snmp_parse_args(argc, argv, &session, "C:iRs", optProc)) {
    case NETSNMP_PARSE_ARGS_ERROR:
        goto out;
    case NETSNMP_PARSE_ARGS_SUCCESS_EXIT:
        exit_code = 0;
        goto out;
    case NETSNMP_PARSE_ARGS_ERROR_USAGE:
        usage();
        goto out;
    default:
        break;
    }

    /*
     * Check argc vs optind ??
     */
    argv += optind;
    argc -= optind;

    /*
     * Open an SNMP session.
     */
    ss = snmp_open(&session);
    if (ss == NULL) {
        /*
         * diagnose snmp_open errors with the input netsnmp_session pointer
         */
        snmp_sess_perror("snmpnetstat", &session);
        goto out;
    }

    /*
     * Omitted:
     *     Privilege handling
     *    "Backward Compatibility"
     *     Kernel namelis handling
     */

#if 0
    if (mflag) {
        /*
         * mbpr(nl[N_MBSTAT].n_value, nl[N_MBPOOL].n_value,
         * nl[N_MCLPOOL].n_value);
         */
        exit_code = 0;
        goto out;
    }
    if (pflag) {
        printproto(tp, tp->pr_name);
        exit_code = 0;
        goto out;
    }
#endif
    /*
     * Keep file descriptors open to avoid overhead
     * of open/close on each call to get* routines.
     */
    sethostent(1);
    setnetent(1);
    if (iflag) {
        intpr(interval);
        exit_code = 0;
        goto out;
    }
    if (rflag) {
        /*
         * if (sflag)
         * rt_stats();
         * else
         */
        if (Lflag || routexpr(af) == 0) {
            if (route4pr(af) == 0 && af == AF_INET)
                routepr();
            route6pr(af);
        }
        exit_code = 0;
        goto out;
    }
    /*
     * if (gflag) {
     * if (sflag) {
     * if (af == AF_INET || af == AF_UNSPEC)
     * mrt_stats(nl[N_MRTPROTO].n_value,
     * nl[N_MRTSTAT].n_value);
     * #ifdef NETSNMP_ENABLE_IPV6
     * if (af == AF_INET6 || af == AF_UNSPEC)
     * mrt6_stats(nl[N_MRT6PROTO].n_value,
     * nl[N_MRT6STAT].n_value);
     * #endif
     * }
     * else {
     * if (af == AF_INET || af == AF_UNSPEC)
     * mroutepr(nl[N_MRTPROTO].n_value,
     * nl[N_MFCHASHTBL].n_value,
     * nl[N_MFCHASH].n_value,
     * nl[N_VIFTABLE].n_value);
     * #ifdef NETSNMP_ENABLE_IPV6
     * if (af == AF_INET6 || af == AF_UNSPEC)
     * mroute6pr(nl[N_MRT6PROTO].n_value,
     * nl[N_MF6CTABLE].n_value,
     * nl[N_MIF6TABLE].n_value);
     * #endif
     * }
     * exit_code = 0;
     * goto out;
     * }
     */
    setservent(1);
    if (Lflag) {
        switch (af) {
        case AF_UNSPEC:
            setprotoent(1);
            /*
             * ugh, this is O(MN) ... why do we do this?
             */
            while ((p = getprotoent())) {
                for (tp = protox; tp->pr_name; tp++)
                    if (strcmp(tp->pr_name, p->p_name) == 0)
                        if (tp->pr_name && tp->pr_wanted)
                            printproto(tp, p->p_name);
            }
            endprotoent();
            break;
        case AF_INET:
            for (tp = protox; tp->pr_name; tp++)
                printproto(tp, tp->pr_name);
            NETSNMP_FALLTHROUGH;
        case AF_INET6:
            for (tp = ip6protox; tp->pr_name; tp++)
                printproto(tp, tp->pr_name);
        }
    } else {
        for (tp = ipxprotox; tp->pr_name; tp++)
            if (!pname || strcmp(pname, tp->pr_name) == 0)
                printproto(tp, pname);
    }
    /*
     * if (af == AF_IPX || af == AF_UNSPEC)
     * for (tp = ipxprotox; tp->pr_name; tp++)
     * printproto(tp, tp->pr_name);
     * if (af == AF_NS || af == AF_UNSPEC)
     * for (tp = nsprotox; tp->pr_name; tp++)
     * printproto(tp, tp->pr_name);
     * if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
     * unixpr(nl[N_UNIXSW].n_value);
     * if (af == AF_APPLETALK || af == AF_UNSPEC)
     * for (tp = atalkprotox; tp->pr_name; tp++)
     * printproto(tp, tp->pr_name);
     */

    exit_code = 0;

  out:
    netsnmp_cleanup_session(&session);
    SOCK_CLEANUP;
    return exit_code;
}

/*
 * Print out protocol statistics or control blocks (per sflag).
 * Namelist checks - Omitted
 */
static void
printproto(struct protox *tp, const char *name)
{
    void            (*pr)(const char *);

    if (sflag) {
        pr = tp->pr_stats;
    } else {
        pr = tp->pr_cblocks;
    }
    if (pr != NULL)
        (*pr) (name);
}

/*
 * Read kernel memory - Omitted
 */

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

/*
 * Find the protox for the given "well-known" name.
 */
static struct protox *
knownname(const 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(const 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())) {
        /*
         * netsnmp_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: %s [snmp_opts] [-Canv] [-Cf address_family]\n",
                   progname);
    (void) fprintf(stderr,
                   "       %s [snmp_opts] [-Cibodnv] [-CI interface] [-Cw wait]\n",
                   progname);
    (void) fprintf(stderr,
                   "       %s [snmp_opts] [-Cs[s]] [-Cp protocol]\n",
                   progname);
    (void) fprintf(stderr,
                   "       %s [snmp_opts] [-Crnv] [-Cf address_family]\n",
                   progname);
}
