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Annotation of embedaddon/ipguard/ethers.c, revision 1.1

1.1     ! misho       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 1.14 2010/07/12 03:46:36 sead 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: }