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/* |
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* Copyright (c) 2002-2003 Erik Fears |
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* Copyright (c) 2014-2015 ircd-hybrid development team |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
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* USA |
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*/ |
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|
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#include "setup.h" |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <time.h> |
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#include <errno.h> |
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#include <assert.h> |
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|
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#include "compat.h" |
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#include "config.h" |
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#include "dnsbl.h" |
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#include "list.h" |
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#include "log.h" |
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#include "main.h" |
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#include "match.h" |
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#include "memory.h" |
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#include "scan.h" |
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#include "irc.h" |
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#include "stats.h" |
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|
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|
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/* |
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* Work out the DNSBL zones and send the dns query |
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*/ |
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void |
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dnsbl_add(struct scan_struct *ss) |
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{ |
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struct in_addr in; |
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unsigned char a, b, c, d; |
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char lookup[128]; |
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node_t *p; |
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int res; |
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struct dnsbl_scan *ds; |
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|
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if (inet_pton(AF_INET, ss->ip, &in) <= 0) |
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{ |
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log_printf("DNSBL -> Invalid address '%s', ignoring.", ss->ip); |
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return; |
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} |
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|
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d = (unsigned char)(in.s_addr >> 24) & 0xFF; |
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c = (unsigned char)(in.s_addr >> 16) & 0xFF; |
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b = (unsigned char)(in.s_addr >> 8) & 0xFF; |
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a = (unsigned char) in.s_addr & 0xFF; |
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|
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LIST_FOREACH(p, OpmItem->blacklists->head) |
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{ |
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struct BlacklistConf *bl = p->data; |
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|
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#ifdef WORDS_BIGENDIAN |
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snprintf(lookup, sizeof(lookup), "%d.%d.%d.%d.%s", a, b, c, d, bl->name); |
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#else |
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snprintf(lookup, sizeof(lookup), "%d.%d.%d.%d.%s", d, c, b, a, bl->name); |
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#endif |
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|
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ds = xcalloc(sizeof *ds); |
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ds->ss = ss; |
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ds->bl = bl; |
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|
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if (OPT_DEBUG) |
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log_printf("DNSBL -> Passed '%s' to resolver", lookup); |
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|
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res = firedns_getip(FDNS_QRY_A, lookup, ds); |
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|
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if (res == -1 && firedns_errno != FDNS_ERR_FDLIMIT) |
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{ |
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log_printf("DNSBL -> Error sending dns lookup for '%s': %s", lookup, firedns_strerror(firedns_errno)); |
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xfree(ds); |
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} |
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else |
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++ss->scans; /* Increase scan count - one for each blacklist */ |
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} |
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} |
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|
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static void |
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dnsbl_positive(struct scan_struct *ss, struct BlacklistConf *bl, unsigned char type) |
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{ |
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char text_type[128] = ""; |
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node_t *p; |
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|
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if (bl->type == A_BITMASK) |
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{ |
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LIST_FOREACH(p, bl->reply->head) |
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{ |
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const struct BlacklistReplyConf *item = p->data; |
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|
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if (item->number & type) |
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{ |
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strncat(text_type, item->type, sizeof(text_type) - strlen(text_type) - 2); |
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text_type[sizeof(text_type) - 2] = '\0'; |
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|
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strncat(text_type, ", ", sizeof(text_type) - strlen(text_type) - 1); |
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text_type[sizeof(text_type) - 1] = '\0'; |
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} |
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} |
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|
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if (text_type[0]) |
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*(strrchr(text_type, ',')) = '\0'; |
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} |
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else |
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{ |
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LIST_FOREACH(p, bl->reply->head) |
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{ |
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const struct BlacklistReplyConf *item = p->data; |
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|
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if (item->number == type) |
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{ |
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strlcpy(text_type, item->type, sizeof(text_type)); |
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break; |
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} |
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} |
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} |
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|
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if (text_type[0] == '\0' && bl->ban_unknown == 0) |
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{ |
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if (OPT_DEBUG) |
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log_printf("DNSBL -> Unknown result from BL zone %s (%d)", bl->name, type); |
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|
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return; |
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} |
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|
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if (ss->manual_target) |
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irc_send("PRIVMSG %s :CHECK -> DNSBL -> %s appears in BL zone %s (%s)", |
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ss->manual_target->name, ss->ip, bl->name, text_type); |
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else if (ss->positive == 0) |
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{ |
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/* Only report it if no other scans have found positives yet. */ |
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scan_positive(ss, (bl->kline[0] ? bl->kline : IRCItem->kline), text_type); |
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|
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irc_send_channels("DNSBL -> %s!%s@%s appears in BL zone %s (%s)", |
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ss->irc_nick, ss->irc_username, ss->irc_hostname, bl->name, |
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text_type); |
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log_printf("DNSBL -> %s!%s@%s appears in BL zone %s (%s)", |
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ss->irc_nick, ss->irc_username, ss->irc_hostname, bl->name, |
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text_type); |
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} |
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|
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/* Record stat */ |
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stats_dnsblrecv(bl); |
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} |
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|
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void |
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dnsbl_result(struct firedns_result *res) |
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{ |
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struct dnsbl_scan *const ds = res->info; |
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|
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if (OPT_DEBUG) |
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{ |
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if (ds->ss->manual_target) |
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log_printf("DNSBL -> Lookup result for %s (%s) %d.%d.%d.%d (error: %d)", |
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ds->ss->ip, |
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res->lookup, |
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(unsigned char)res->text[0], |
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(unsigned char)res->text[1], |
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(unsigned char)res->text[2], |
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(unsigned char)res->text[3], firedns_errno); |
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else |
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log_printf("DNSBL -> Lookup result for %s!%s@%s (%s) %d.%d.%d.%d (error: %d)", |
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ds->ss->irc_nick, |
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ds->ss->irc_username, |
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ds->ss->irc_hostname, |
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res->lookup, |
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(unsigned char)res->text[0], |
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(unsigned char)res->text[1], |
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(unsigned char)res->text[2], |
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(unsigned char)res->text[3], firedns_errno); |
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} |
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|
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/* Everything is OK */ |
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if (res->text[0] == '\0' && firedns_errno == FDNS_ERR_NXDOMAIN) |
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{ |
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if (ds->ss->manual_target) |
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irc_send("PRIVMSG %s :CHECK -> DNSBL -> %s does not appear in BL zone %s", |
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ds->ss->manual_target->name, ds->ss->ip, |
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(strlen(ds->ss->ip) < strlen(res->lookup)) ? (res->lookup + strlen(ds->ss->ip) + 1) : res->lookup); |
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|
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--ds->ss->scans; /* We are done with ss here */ |
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scan_checkfinished(ds->ss); /* This could free ss, don't use ss after this point */ |
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xfree(ds); /* No longer need our information */ |
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return; |
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} |
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|
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/* Either an error, or a positive lookup */ |
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if (firedns_errno == FDNS_ERR_NONE) |
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dnsbl_positive(ds->ss, ds->bl, (unsigned char)res->text[3]); |
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else |
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{ |
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log_printf("DNSBL -> Lookup error on %s: %s", res->lookup, |
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firedns_strerror(firedns_errno)); |
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|
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if (firedns_errno != FDNS_ERR_TIMEOUT) |
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irc_send_channels("DNSBL -> Lookup error on %s: %s", res->lookup, |
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firedns_strerror(firedns_errno)); |
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} |
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|
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/* Check if ss has any remaining scans */ |
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--ds->ss->scans; /* We are done with ss here */ |
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scan_checkfinished(ds->ss); /* This could free ss, don't use ss after this point */ |
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xfree(ds); /* Finished with dnsbl_scan too */ |
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} |
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|
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void |
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dnsbl_cycle(void) |
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{ |
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firedns_cycle(); |
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} |
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|
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#define DNSBL_REPORT_VERSION "3.1.3" |
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|
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/* |
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* Send an email to report this open proxy. |
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*/ |
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void |
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dnsbl_report(const struct scan_struct *ss) |
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{ |
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char buf[4096], cmdbuf[512]; |
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FILE *fp; |
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|
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assert(ss->ip); |
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|
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if (EmptyString(OpmItem->dnsbl_to) || EmptyString(OpmItem->dnsbl_from) || EmptyString(OpmItem->sendmail)) |
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return; |
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|
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snprintf(cmdbuf, sizeof(cmdbuf), "%s -t", OpmItem->sendmail); |
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snprintf(buf, sizeof(buf), |
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"From: %s <%s>\n" |
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"To: %s\n" |
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"Subject: BOPM Report\n" |
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"X-BOPM-Version: %s\n\n" |
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"%s: %s:%d\n\n" |
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"%s\n", IRCItem->nick, OpmItem->dnsbl_from, OpmItem->dnsbl_to, |
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DNSBL_REPORT_VERSION, scan_gettype(ss->remote->protocol), ss->ip, |
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ss->remote->port, ss->proof); |
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|
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if (OPT_DEBUG >= 3) |
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log_printf("DNSBL -> Sending following email:\n%s\n", buf); |
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|
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if ((fp = popen(cmdbuf, "w")) == NULL) |
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{ |
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log_printf("DNSBL -> Failed to create pipe to '%s' for email report!", cmdbuf); |
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irc_send_channels("I was trying to create a pipe to '%s' to send a DNSBL " |
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"report, and it failed! I'll give up for now.", |
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cmdbuf); |
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return; |
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} |
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|
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fputs(buf, fp); |
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pclose(fp); |
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|
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log_printf("DNSBL -> Sent report to %s [%s]", OpmItem->dnsbl_to, ss->ip); |
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|
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/* Record send in stats */ |
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stats_dnsblsend(); |
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} |
