/*  ethers.c
 *
 * Copyright (c) 2005 SeaD <sead@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.
 *
 */

#include "ipguard.h"

#define STR_SIZE        128
#define ADDR_MAX        20

void ethers_init(void) {
    FILE *ethers_file;
    char str[STR_SIZE];
    char mac[ADDR_MAX], ip[ADDR_MAX];
    register int n, m;

    if (!(ethers_file = fopen(ethers_name, "r"))) {
        snprintf(s, 128, "fopen(%s):", ethers_name);
        log_str(ERROR, s, strerror(errno));
        return;
    }
    while (fgets(str, STR_SIZE, ethers_file)) {
        for (mac[0] = ip[0] = '\0', n = 0; n < STR_SIZE; n++) {
            if ((str[n] != ' ') && (str[n] != '\t')) break;
        }
        if ((str[n] == '+') || (str[n] == '#') || (str[n] == '\n')) continue;
        for (m = 0; (m < ADDR_MAX) && (n < STR_SIZE); m++, n++) {
            mac[m] = str[n];
            if ((str[n] == ' ') || (str[n] == '\t')) {
                mac[m] = '\0'; break;
            }
        }
        for (; n < STR_SIZE; n++) {
            if ((str[n] != ' ') && (str[n] != '\t')) break;
        }
        for (m = 0; (m < ADDR_MAX) && (n < STR_SIZE); m++, n++) {
            ip[m] = str[n];
            if ((str[n] == ' ') || (str[n] == '\t')
                || (str[n] == '\n') || (str[n] == '#')) {
                ip[m] = '\0'; break;
            }
        }

        if (!mac) { if (verbose) log_str(WARNING, "wrong first address", mac); continue; }
        if (!ip) { if (verbose) log_str(WARNING, "wrong second address", ip); continue; }
        if (strchr(mac, '.')) { strncpy(str, mac, ADDR_MAX); strncpy(mac, ip, ADDR_MAX); strncpy(ip, str, ADDR_MAX); }
        if (!strchr(mac, ':')) { log_str(WARNING, "wrong mac address", ip); continue; }
        if (!strchr(ip, '.')) { log_str(WARNING, "wrong ip address", ip); continue; }

        pair_add(mac, ip);
    }

    if (fclose(ethers_file)) {
        snprintf(s, 128, "fclose(%s):", ethers_name);
        log_str(ERROR, s, strerror(errno));
        exit(EXIT_FAILURE);
    }
}

void ethers_reinit(void) {
    pair_destroy(); pair_init(iface); ethers_init();
    log_str(NOTICE, "ethers file rereaded:", ethers_name);
}