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ipguard

/*  ipguard.c
 *
 * Copyright (c) 2010 SeaD <sead at deep.perm.ru>
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
 *
 *  $Id: ipguard.c,v 1.1.1.1 2012/02/21 21:59:41 misho Exp $
 *
 */

#include "ipguard.h"

void usage(char *name) {
    fprintf(stdout, "%s v%s (c) %s <%s>\n\n", NAME, VERSION, AUTHOR, MAIL);
    fprintf(stdout, "usage: %s [-h] [-ajgrxziovd]\n", name);
    fprintf(stdout, "    [-f ethers] [-l log] [-p pid] [-m mac] [-c filter] [-u seconds] [-k seconds]\n");
    fprintf(stdout, "    [-n fakes] [-t mseconds] [-b buf] [-s user] <iface>\n\n");
}

void help(void) {
    fprintf(stdout, "available options:\n");
    fprintf(stdout, "    -f | -e <ethers>    ethers file (" ETHERSFILE ")\n");
    fprintf(stdout, "    -l <log>            log file (" LOGNAME "_<iface>.log)\n");
    fprintf(stdout, "    -p <pid>            pid file (" PIDNAME "_<iface>.pid)\n");
    fprintf(stdout, "    -m <mac>            fake mac (" FAKEMAC ")\n");
    fprintf(stdout, "    -c <filter>         pcap expression (none)\n");
    fprintf(stdout, "    -u <seconds>        update ethers interval (%d)\n", ETHERSTO);
    fprintf(stdout, "    -k <seconds>        fake regenerate time (%d)\n", FAKEREGEN);
    fprintf(stdout, "    -n <fakes>          fake replies number (%d)\n", FAKENUM);
    fprintf(stdout, "    -t <mseconds>       time between fakes (%d)\n", FAKETIME);
    fprintf(stdout, "    -b <buf>            mac-ip buffer size (%d)\n", BUFSIZE);
    fprintf(stdout, "    -s <user>           set user (none)\n");
    fprintf(stdout, "    -a                  no address substitution\n");
    fprintf(stdout, "    -j                  disable first mac-ip\n");
    fprintf(stdout, "    -g                  default to grant\n");
    fprintf(stdout, "    -r                  read only\n");
    fprintf(stdout, "    -x                  duplex mode\n");
    fprintf(stdout, "    -z                  fix by broadcast\n");
    fprintf(stdout, "    -i                  hidden mode\n");
    fprintf(stdout, "    -o                  promiscuous mode\n");
    fprintf(stdout, "    -v                  be verbose\n");
    fprintf(stdout, "    -d[d[d]]            don't fork [debug [more]]\n");
    fprintf(stdout, "    -h                  this help\n");
}

int main(int argc, char *argv[]) {
    extern char *optarg;
    extern int optind;
    int n;

    if (getuid()) {
        fprintf(stderr, "error: must be run as root to init libnet\n");
        exit(EXIT_FAILURE);
    }

    srand((unsigned int) getpid());

    iface[0] = fmac[0] = pfmac[0] = pcapf[0] = log_name[0] = pid_name[0] = suser[0] = '\0';
    strncpy(ethers_name, ETHERSFILE, PATH_MAX);
    strncpy(fmac, FAKEMAC, 18);
    ethers_update = ETHERSTO;
    fake_regen = FAKEREGEN;
    fake_num = FAKENUM;
    fake_time = FAKETIME;
    buffer_num = BUFSIZE;
    addr_nosubst = nofirst = grant = read_only = duplex = fixbc = hidden =
        promisc = debug = verbose = 0;

    all = good = grat = wgrat = zmac = zip = bad = bmac = bsip =
        btip = bnew = bgrat = mymac = fake = pfake = nzh = nbe = mis = 0;

    /*  Still unused letters: q:w:y and all of figures ;)
    */

    while ((n = getopt(argc, argv, "f:e:l:p:m:c:s:u:k:n:t:b:ajgrxziovdh")) != EOF) {
        switch (n) {
            case 'f':
            case 'e': strncpy(ethers_name, optarg, PATH_MAX); break;
            case 'l': strncpy(log_name, optarg, PATH_MAX); break;
            case 'p': strncpy(pid_name, optarg, PATH_MAX); break;
            case 'm': strncpy(fmac, optarg, 18); break;
            case 'c': strncpy(pcapf, optarg, PCAPFSIZ); break;
            case 's': strncpy(suser, optarg, MAXLOGNAME); break;
            case 'u': ethers_update = atoi(optarg); break;
            case 'k': fake_regen = atoi(optarg); break;
            case 'n': fake_num = atoi(optarg); break;
            case 't': fake_time = atoi(optarg); break;
            case 'b': buffer_num = atoi(optarg); break;
            case 'a': addr_nosubst++; break;
            case 'j': nofirst++; break;
            case 'g': grant++; break;
            case 'r': read_only++; break;
            case 'x': duplex++; break;
            case 'z': fixbc++; break;
            case 'i': hidden++; break;
            case 'o': promisc++; break;
            case 'v': verbose++; break;
            case 'd': debug++; break;
            case 'h': usage(argv[0]); help(); exit(EXIT_SUCCESS);
            default: usage(argv[0]); exit(EXIT_FAILURE);
        }
    }
    if (argc > optind) { strncpy(iface, argv[optind], IFNAMSIZ); }
    else { usage(argv[0]); exit(EXIT_FAILURE); }

    if (!log_name[0]) snprintf(log_name, PATH_MAX, "%s_%s.log", LOGNAME, iface);
    if (!pid_name[0]) snprintf(pid_name, PATH_MAX, "%s_%s.pid", PIDNAME, iface);

    if (!pcapf[0]) strncpy(pcapf, "arp", 3);
    else { pcapf[PCAPFSIZ-10] = '\0'; strncat(pcapf, " and arp", 8); }

    log_open();

    if (verbose) { log_str(NOTICE, "Starting", argv[0]); }

    if (debug > 1) {
        fprintf(stderr, "PARAMS:");
        for (n = 1; n < argc; n++) fprintf(stderr, " %s", argv[n]);
        fprintf(stderr, "\n");
        fprintf(stderr, "PCAP FILTER: %s\n", pcapf);
    }

    if (!debug) daemonize();
    pid_creat();
    packet_init(iface);
    if (suser[0]) set_user();
    sig_init();

    while (1) packet_recv();

    exit_ipguard(EXIT_SUCCESS);
    return 0;
}