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ipguard

    1: /*  ethers.c
    2:  *
    3:  * Copyright (c) 2010 SeaD <sead at deep.perm.ru>
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  *
   14:  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17:  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   18:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24:  * SUCH DAMAGE.
   25:  *
   26:  *  $Id: ethers.c,v 1.1.1.1 2012/02/21 21:59:41 misho Exp $
   27:  *
   28:  */
   29: 
   30: #include "ipguard.h"
   31: 
   32: #define STR_SIZE        128
   33: #define ADDR_LEN        64
   34: 
   35: void ethers_init(void) {
   36:     FILE *eth_fp;
   37:     char str[STR_SIZE];
   38:     char mac[ADDR_LEN], ip[ADDR_LEN];
   39:     register int n, m;
   40: 
   41:     if (!(eth_fp = fopen(ethers_name, "r"))) {
   42:         snprintf(s, 128, "fopen(%s):", ethers_name);
   43:         log_str(WARNING, s, strerror(errno));
   44:         return;
   45:     }
   46: 
   47:     while (fgets(str, STR_SIZE, eth_fp)) {
   48:         if (debug > 2) fprintf(stderr, "ETHERS: %s", str);
   49:         for (n = 0; n < STR_SIZE; n++)
   50:             if ((str[n] == '\n') || (str[n] == '\r') || (str[n] == '#')) {
   51:                 str[n] = '\0'; break;
   52:             }
   53:         for (mac[0] = ip[0] = '\0', n = 0; n < STR_SIZE; n++)
   54:             if ((str[n] != ' ') && (str[n] != '\t')) break;
   55:         if ((str[n] == '+') || (str[n] == '\0')) continue;
   56:         for (m = 0; (m < ADDR_LEN) && (n < STR_SIZE); m++, n++) {
   57:             if ((str[n] == ' ') || (str[n] == '\t') || (str[n] == '\0')) {
   58:                 mac[m] = '\0'; break;
   59:             }
   60:             mac[m] = str[n];
   61:         }
   62:         for (; n < STR_SIZE; n++) if ((str[n] != ' ') && (str[n] != '\t')) break;
   63:         for (m = 0; (m < ADDR_LEN) && (n < STR_SIZE); m++, n++) {
   64:             if ((str[n] == ' ') || (str[n] == '\t') || (str[n] == '\0')) {
   65:                 ip[m] = '\0'; break;
   66:             }
   67:             ip[m] = str[n];
   68:         }
   69: 
   70:         if (ip[0] == '\0') { if (verbose) log_str(NOTICE, "Incorrect MAC-IP pair:", str); continue; }
   71:         if (strchr(mac, '.')) { strncpy(str, mac, ADDR_LEN); strncpy(mac, ip, ADDR_LEN); strncpy(ip, str, ADDR_LEN); }
   72:         if (!strchr(mac, ':')) { if (verbose) log_str(NOTICE, "Wrong MAC address", ip); continue; }
   73:         if (!strchr(ip, '.')) { if (verbose) log_str(NOTICE, "Wrong IP address", ip); continue; }
   74: 
   75:         pair_add(mac, ip);
   76:     }
   77: 
   78:     if (fclose(eth_fp)) {
   79:         snprintf(s, 128, "fclose(%s):", ethers_name);
   80:         log_str(ERROR, s, strerror(errno));
   81:         exit_ipguard(EXIT_FAILURE);
   82:     }
   83: }
   84: 
   85: void ethers_reinit(void) {
   86:     pair_destroy(); pair_init(); ethers_init();
   87:     log_str(NOTICE, "MAC-IP file rescanned:", ethers_name);
   88: }