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/* |
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* Copyright (c) 2002 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 <unistd.h> |
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#include <assert.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/time.h> |
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#include <time.h> |
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#include <errno.h> |
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#include <fcntl.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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|
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#include "compat.h" |
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#include "config.h" |
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#include "irc.h" |
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#include "log.h" |
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#include "stats.h" |
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#include "dnsbl.h" |
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#include "options.h" |
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#include "negcache.h" |
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#include "main.h" |
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#include "memory.h" |
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#include "match.h" |
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#include "misc.h" |
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#include "scan.h" |
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|
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/* Libopm */ |
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|
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#include "libopm/src/opm.h" |
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#include "libopm/src/opm_common.h" |
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#include "libopm/src/opm_error.h" |
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#include "libopm/src/opm_types.h" |
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|
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|
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/* GLOBAL LISTS */ |
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|
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static list_t *SCANNERS; /* List of OPM_T */ |
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static list_t *MASKS; /* Associative list of masks->scanners */ |
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|
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|
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/* Function declarations */ |
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static struct scan_struct *scan_create(const char *[], const char *); |
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static void scan_free(struct scan_struct *); |
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static void scan_irckline(const struct scan_struct *, const char *, const char *); |
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static void scan_negative(const struct scan_struct *); |
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static void scan_log(OPM_REMOTE_T *); |
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|
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/** Callbacks for LIBOPM */ |
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static void scan_open_proxy(OPM_T *, OPM_REMOTE_T *, int, void *); |
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static void scan_negotiation_failed(OPM_T *, OPM_REMOTE_T *, int, void *); |
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static void scan_timeout(OPM_T *, OPM_REMOTE_T *, int, void *); |
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static void scan_end(OPM_T *, OPM_REMOTE_T *, int, void *); |
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static void scan_handle_error(OPM_T *, OPM_REMOTE_T *, int, void *); |
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|
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extern FILE *scanlogfile; |
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|
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|
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/* scan_cycle |
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* |
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* Perform scanner tasks. |
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*/ |
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void |
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scan_cycle(void) |
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{ |
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node_t *node; |
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|
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/* Cycle through the blacklist first.. */ |
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dnsbl_cycle(); |
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|
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/* Cycle each scanner object */ |
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LIST_FOREACH(node, SCANNERS->head) |
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{ |
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struct scanner_struct *scs = node->data; |
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opm_cycle(scs->scanner); |
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} |
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} |
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|
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/* scan_timer |
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* |
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* Perform actions that are to be performed every ~1 second. |
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* |
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* Parameters: NONE |
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* Return: NONE |
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* |
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*/ |
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void |
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scan_timer(void) |
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{ |
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static time_t nc_counter; |
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|
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if (OptionsItem->negcache) |
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{ |
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if (nc_counter++ >= OptionsItem->negcache_rebuild) |
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{ |
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/* |
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* Time to rebuild the negative cache. |
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*/ |
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if (OPT_DEBUG) |
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log_printf("SCAN -> Rebuilding negative cache"); |
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|
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negcache_rebuild(); |
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nc_counter = 0; |
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} |
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} |
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} |
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|
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/* scan_gettype(int protocol) |
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* |
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* Return human readable name of OPM PROTOCOL given OPM_TYPE_PROTOCOL |
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* |
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* Parameters: |
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* protocol: Protocol to return (from libopm/src/opm_types.h) |
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* |
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* Return: |
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* Pointer to static string containing human readable form of protocol |
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* name |
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* |
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*/ |
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const char * |
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scan_gettype(int protocol) |
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{ |
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static const char *undef = "undefined"; |
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static const struct protocol_assoc protocols[] = |
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{ |
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{ OPM_TYPE_HTTP, "HTTP" }, |
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{ OPM_TYPE_HTTPPOST, "HTTPPOST" }, |
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{ OPM_TYPE_SOCKS4, "SOCKS4" }, |
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{ OPM_TYPE_SOCKS5, "SOCKS5" }, |
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{ OPM_TYPE_WINGATE, "WINGATE" }, |
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{ OPM_TYPE_ROUTER, "ROUTER" }, |
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{ OPM_TYPE_HTTPS, "HTTPS" }, |
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{ OPM_TYPE_HTTPSPOST, "HTTPSPOST" }, |
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{ OPM_TYPE_DREAMBOX, "DREAMBOX" } |
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}; |
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|
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for (unsigned int i = 0; i < (sizeof(protocols) / sizeof(struct protocol_assoc)); ++i) |
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if (protocol == protocols[i].type) |
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return protocols[i].name; |
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|
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return undef; |
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} |
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|
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/* scan_checkexempt |
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* |
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* Check mask against exempt list. |
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* |
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* Parameters: |
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* mask: Mask to check |
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* |
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* Return: |
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* 1 if mask is in list |
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* 0 if mask is not in list |
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*/ |
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static int |
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scan_checkexempt(const char *mask, const char *ipmask) |
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{ |
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node_t *node; |
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|
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LIST_FOREACH(node, ExemptItem->masks->head) |
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{ |
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const char *exempt_mask = node->data; |
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|
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if (!match(exempt_mask, mask) || !match(exempt_mask, ipmask)) |
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return 1; |
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} |
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|
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return 0; |
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} |
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|
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/* scan_init |
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|
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Initialize scanner and masks list based on configuration. |
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|
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Parameters: |
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None |
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|
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Return: |
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None |
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*/ |
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void |
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scan_init(void) |
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{ |
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node_t *p, *p2, *p3, *p4, *node; |
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struct UserConf *uc; |
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struct ScannerConf *sc; |
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struct ProtocolConf *pc; |
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struct scanner_struct *scs; |
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|
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SCANNERS = list_create(); |
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MASKS = list_create(); |
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|
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/* Setup each individual scanner */ |
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LIST_FOREACH(p, ScannerItemList->head) |
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{ |
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sc = p->data; |
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scs = xcalloc(sizeof(*scs)); |
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|
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if (OPT_DEBUG) |
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log_printf("SCAN -> Setting up scanner [%s]", sc->name); |
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|
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/* Build the scanner */ |
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scs->scanner = opm_create(); |
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scs->name = xstrdup(sc->name); |
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scs->masks = list_create(); |
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|
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/* Setup configuration */ |
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opm_config(scs->scanner, OPM_CONFIG_FD_LIMIT, &sc->fd); |
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opm_config(scs->scanner, OPM_CONFIG_SCAN_IP, sc->target_ip); |
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opm_config(scs->scanner, OPM_CONFIG_SCAN_PORT, &sc->target_port); |
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opm_config(scs->scanner, OPM_CONFIG_TIMEOUT, &sc->timeout); |
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opm_config(scs->scanner, OPM_CONFIG_MAX_READ, &sc->max_read); |
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opm_config(scs->scanner, OPM_CONFIG_BIND_IP, sc->vhost); |
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|
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/* add target strings */ |
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LIST_FOREACH(p2, sc->target_string->head) |
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opm_config(scs->scanner, OPM_CONFIG_TARGET_STRING, p2->data); |
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|
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/* Setup callbacks */ |
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opm_callback(scs->scanner, OPM_CALLBACK_OPENPROXY, &scan_open_proxy, scs); |
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opm_callback(scs->scanner, OPM_CALLBACK_NEGFAIL, &scan_negotiation_failed, scs); |
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opm_callback(scs->scanner, OPM_CALLBACK_TIMEOUT, &scan_timeout, scs); |
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opm_callback(scs->scanner, OPM_CALLBACK_END, &scan_end, scs); |
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opm_callback(scs->scanner, OPM_CALLBACK_ERROR, &scan_handle_error, scs); |
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|
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/* Setup the protocols */ |
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LIST_FOREACH(p2, sc->protocols->head) |
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{ |
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pc = p2->data; |
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|
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if (OPT_DEBUG >= 2) |
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log_printf("SCAN -> Adding protocol %s:%d to scanner [%s]", |
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scan_gettype(pc->type), pc->port, scs->name); |
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|
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if (opm_addtype(scs->scanner, pc->type, pc->port) == OPM_ERR_BADPROTOCOL) |
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log_printf("SCAN -> Error bad protocol %s:%d in scanner [%s]", |
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scan_gettype(pc->type), pc->port, scs->name); |
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} |
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|
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node = node_create(scs); |
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list_add(SCANNERS, node); |
264 |
} |
265 |
|
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/* Give scanners a list of masks they scan */ |
267 |
LIST_FOREACH(p, SCANNERS->head) |
268 |
{ |
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scs = p->data; |
270 |
|
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LIST_FOREACH(p2, UserItemList->head) |
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{ |
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uc = p2->data; |
274 |
|
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LIST_FOREACH(p3, uc->scanners->head) |
276 |
{ |
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const char *scannername = p3->data; |
278 |
|
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/* Add all these masks to scanner */ |
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if (strcasecmp(scannername, scs->name) == 0) |
281 |
{ |
282 |
LIST_FOREACH(p4, uc->masks->head) |
283 |
{ |
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const char *mask = p4->data; |
285 |
|
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if (OPT_DEBUG) |
287 |
log_printf("SCAN -> Linking the mask [%s] to scanner [%s]", mask, scannername); |
288 |
|
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node = node_create(xstrdup(mask)); |
290 |
list_add(scs->masks, node); |
291 |
} |
292 |
|
293 |
break; |
294 |
} |
295 |
} |
296 |
} |
297 |
} |
298 |
|
299 |
/* Initialise negative cache */ |
300 |
if (OptionsItem->negcache) |
301 |
{ |
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if (OPT_DEBUG >= 2) |
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log_printf("SCAN -> Initializing negative cache"); |
304 |
|
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nc_init(&nc_head); |
306 |
} |
307 |
} |
308 |
|
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/* scan_connect |
310 |
* |
311 |
* scan_connect is called when m_notice (irc.c) matches a connection |
312 |
* notice and parses the connecting user out of it. |
313 |
* |
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* Parameters: |
315 |
* user: Parsed items from the connection notice: |
316 |
* user[0] = connecting users nickname |
317 |
* user[1] = connecting users username |
318 |
* user[2] = connecting users hostname |
319 |
* user[3] = connecting users IP |
320 |
* msg = Original connect notice |
321 |
* Return: NONE |
322 |
* |
323 |
*/ |
324 |
void |
325 |
scan_connect(const char *user[], const char *msg) |
326 |
{ |
327 |
node_t *p, *p2; |
328 |
struct scan_struct *ss; |
329 |
struct scanner_struct *scs; |
330 |
int ret; |
331 |
|
332 |
/* |
333 |
* Have to use MSGLENMAX here because it is unknown what the max size of |
334 |
* username/hostname can be. Some ircds use really mad values for |
335 |
* these. |
336 |
*/ |
337 |
char hostmask[MSGLENMAX]; |
338 |
char addrmask[MSGLENMAX]; |
339 |
|
340 |
/* Check negcache before anything */ |
341 |
if (OptionsItem->negcache) |
342 |
{ |
343 |
struct sockaddr_in ip; |
344 |
|
345 |
if (inet_pton(AF_INET, user[3], &ip.sin_addr) <= 0) |
346 |
{ |
347 |
log_printf("SCAN -> Invalid IPv4 address '%s'!", user[3]); |
348 |
return; |
349 |
} |
350 |
|
351 |
if (check_neg_cache(ip.sin_addr.s_addr)) |
352 |
{ |
353 |
if (OPT_DEBUG) |
354 |
log_printf("SCAN -> %s!%s@%s (%s) is negatively cached. Skipping all tests.", |
355 |
user[0], user[1], user[2], user[3]); |
356 |
return; |
357 |
} |
358 |
} |
359 |
|
360 |
/* Generate user mask */ |
361 |
snprintf(hostmask, sizeof(hostmask), "%s!%s@%s", user[0], user[1], user[2]); |
362 |
snprintf(addrmask, sizeof(addrmask), "%s!%s@%s", user[0], user[1], user[3]); |
363 |
|
364 |
/* Check exempt list now that we have a mask */ |
365 |
if (scan_checkexempt(hostmask, addrmask)) |
366 |
{ |
367 |
if (OPT_DEBUG) |
368 |
log_printf("SCAN -> %s (%s) is exempt from scanning", hostmask, addrmask); |
369 |
|
370 |
return; |
371 |
} |
372 |
|
373 |
/* Create scan_struct */ |
374 |
ss = scan_create(user, msg); |
375 |
|
376 |
/* Store ss in the remote struct, so that in callbacks we have ss */ |
377 |
ss->remote->data = ss; |
378 |
|
379 |
/* Start checking our DNSBLs */ |
380 |
if (LIST_SIZE(OpmItem->blacklists)) |
381 |
dnsbl_add(ss); |
382 |
|
383 |
/* Add ss->remote to all matching scanners */ |
384 |
LIST_FOREACH(p, SCANNERS->head) |
385 |
{ |
386 |
scs = p->data; |
387 |
|
388 |
LIST_FOREACH(p2, scs->masks->head) |
389 |
{ |
390 |
const char *scsmask = p2->data; |
391 |
|
392 |
if (!match(scsmask, hostmask)) |
393 |
{ |
394 |
if (OPT_DEBUG) |
395 |
log_printf("SCAN -> Passing %s to scanner [%s]", hostmask, scs->name); |
396 |
|
397 |
if ((ret = opm_scan(scs->scanner, ss->remote)) != OPM_SUCCESS) |
398 |
{ |
399 |
switch (ret) |
400 |
{ |
401 |
case OPM_ERR_NOPROTOCOLS: |
402 |
continue; |
403 |
break; |
404 |
case OPM_ERR_BADADDR: |
405 |
log_printf("OPM -> Bad address %s [%s].", |
406 |
(ss->manual_target ? ss->manual_target->name : |
407 |
"(unknown)"), ss->ip); |
408 |
break; |
409 |
default: |
410 |
log_printf("OPM -> Unknown error %s [%s].", |
411 |
(ss->manual_target ? ss->manual_target->name : |
412 |
"(unknown)"), ss->ip); |
413 |
break; |
414 |
} |
415 |
} |
416 |
else |
417 |
++ss->scans; /* Increase scan count only if OPM_SUCCESS */ |
418 |
|
419 |
break; /* Continue to next scanner */ |
420 |
} |
421 |
} |
422 |
} |
423 |
|
424 |
/* All scanners returned !OPM_SUCCESS and there were no dnsbl checks */ |
425 |
if (ss->scans == 0) |
426 |
scan_free(ss); |
427 |
} |
428 |
|
429 |
/* scan_create |
430 |
* |
431 |
* Allocate scan struct, including user information and REMOTE |
432 |
* for LIBOPM. |
433 |
* |
434 |
* Parameters: |
435 |
* user: Parsed items from the connection notice: |
436 |
* user[0] = connecting users nickname |
437 |
* user[1] = connecting users username |
438 |
* user[2] = connecting users hostname |
439 |
* user[3] = connecting users IP |
440 |
* msg = Original connect notice (used as PROOF) |
441 |
* |
442 |
* Return: Pointer to new scan_struct |
443 |
* |
444 |
*/ |
445 |
static struct scan_struct * |
446 |
scan_create(const char *user[], const char *msg) |
447 |
{ |
448 |
struct scan_struct *ss = xcalloc(sizeof(*ss)); |
449 |
|
450 |
ss->irc_nick = xstrdup(user[0]); |
451 |
ss->irc_username = xstrdup(user[1]); |
452 |
ss->irc_hostname = xstrdup(user[2]); |
453 |
ss->ip = xstrdup(user[3]); |
454 |
ss->proof = xstrdup(msg); |
455 |
ss->remote = opm_remote_create(ss->ip); |
456 |
|
457 |
return ss; |
458 |
} |
459 |
|
460 |
/* scan_free |
461 |
* |
462 |
* Free a scan_struct. This should only be done if the scan struct has |
463 |
* no scans left! |
464 |
* |
465 |
* Parameters: |
466 |
* ss: scan_struct to free |
467 |
* |
468 |
* Return: NONE |
469 |
*/ |
470 |
static void |
471 |
scan_free(struct scan_struct *ss) |
472 |
{ |
473 |
xfree(ss->irc_nick); |
474 |
xfree(ss->irc_username); |
475 |
xfree(ss->irc_hostname); |
476 |
xfree(ss->ip); |
477 |
xfree(ss->proof); |
478 |
|
479 |
opm_remote_free(ss->remote); |
480 |
xfree(ss); |
481 |
} |
482 |
|
483 |
/* scan_checkfinished |
484 |
* |
485 |
* Check if a scan is complete (ss->scans <= 0) |
486 |
* and free it if need be. |
487 |
*/ |
488 |
void |
489 |
scan_checkfinished(struct scan_struct *ss) |
490 |
{ |
491 |
if (ss->scans <= 0) |
492 |
{ |
493 |
if (ss->manual_target) |
494 |
irc_send("PRIVMSG %s :CHECK -> All tests on %s completed.", |
495 |
ss->manual_target->name, ss->ip); |
496 |
else |
497 |
{ |
498 |
if (OPT_DEBUG) |
499 |
/* If there was a manual_target, then irc_nick, etc is NULL. */ |
500 |
log_printf("SCAN -> All tests on %s!%s@%s complete.", |
501 |
ss->irc_nick, ss->irc_username, ss->irc_hostname); |
502 |
|
503 |
/* Scan was a negative */ |
504 |
if (ss->positive == 0) |
505 |
scan_negative(ss); |
506 |
} |
507 |
|
508 |
scan_free(ss); |
509 |
} |
510 |
} |
511 |
|
512 |
/* scan_positive |
513 |
* |
514 |
* Remote host (defined by ss) has been found positive by one or more |
515 |
* tests. |
516 |
* |
517 |
* Parameters: |
518 |
* ss: scan_struct containing information regarding positive host |
519 |
* kline: command to send to IRC server to ban the user (see scan_irckline) |
520 |
* type: string of the type of proxy found to be running on the host |
521 |
* |
522 |
* Return: NONE |
523 |
* |
524 |
*/ |
525 |
void |
526 |
scan_positive(struct scan_struct *ss, const char *kline, const char *type) |
527 |
{ |
528 |
node_t *node; |
529 |
|
530 |
/* If already a positive, don't kline/close again */ |
531 |
if (ss->positive) |
532 |
return; |
533 |
|
534 |
/* Format KLINE and send to IRC server */ |
535 |
scan_irckline(ss, kline, type); |
536 |
|
537 |
/* Speed up the cleanup procedure */ |
538 |
/* Close all scans prematurely */ |
539 |
LIST_FOREACH(node, SCANNERS->head) |
540 |
{ |
541 |
OPM_T *scanner = ((struct scanner_struct *)node->data)->scanner; |
542 |
opm_end(scanner, ss->remote); |
543 |
} |
544 |
|
545 |
/* Set it as a positive (to avoid a scan_negative call later on */ |
546 |
ss->positive = 1; |
547 |
} |
548 |
|
549 |
/* scan_open_proxy CALLBACK |
550 |
* |
551 |
* Called by libopm when a proxy is verified open. |
552 |
* |
553 |
* Parameters: |
554 |
* scanner: Scanner that found the open proxy. |
555 |
* remote: Remote struct containing information regarding remote end |
556 |
* |
557 |
* Return: NONE |
558 |
*/ |
559 |
static void |
560 |
scan_open_proxy(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
561 |
{ |
562 |
struct scan_struct *ss; |
563 |
struct scanner_struct *scs; |
564 |
|
565 |
/* Record that a scan happened */ |
566 |
scan_log(remote); |
567 |
|
568 |
scs = data; |
569 |
ss = remote->data; |
570 |
|
571 |
if (ss->manual_target == NULL) |
572 |
{ |
573 |
/* kline and close scan */ |
574 |
scan_positive(ss, IRCItem->kline, scan_gettype(remote->protocol)); |
575 |
|
576 |
/* Report to blacklist */ |
577 |
dnsbl_report(ss); |
578 |
|
579 |
irc_send_channels("OPEN PROXY -> %s!%s@%s %s:%d (%s) [%s]", |
580 |
ss->irc_nick, ss->irc_username, ss->irc_hostname, remote->ip, |
581 |
remote->port, scan_gettype(remote->protocol), scs->name); |
582 |
log_printf("SCAN -> OPEN PROXY %s!%s@%s %s:%d (%s) [%s]", |
583 |
ss->irc_nick, ss->irc_username, ss->irc_hostname, remote->ip, |
584 |
remote->port, scan_gettype(remote->protocol), scs->name); |
585 |
} |
586 |
else |
587 |
{ |
588 |
irc_send("PRIVMSG %s :CHECK -> OPEN PROXY %s:%d (%s) [%s]", |
589 |
ss->manual_target->name, remote->ip, remote->port, |
590 |
scan_gettype(remote->protocol), scs->name); |
591 |
log_printf("SCAN -> OPEN PROXY %s:%d (%s) [%s]", remote->ip, |
592 |
remote->port, scan_gettype(remote->protocol), scs->name); |
593 |
} |
594 |
|
595 |
/* Record the proxy for stats purposes */ |
596 |
stats_openproxy(remote->protocol); |
597 |
} |
598 |
|
599 |
/* scan_negotiation_failed CALLBACK |
600 |
* |
601 |
* Called by libopm when negotiation of a specific protocol failed. |
602 |
* |
603 |
* Parameters: |
604 |
* scanner: Scanner where the negotiation failed. |
605 |
* remote: Remote struct containing information regarding remote end |
606 |
* |
607 |
* Return: NONE |
608 |
* |
609 |
*/ |
610 |
static void |
611 |
scan_negotiation_failed(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
612 |
{ |
613 |
const struct scanner_struct *scs = data; |
614 |
|
615 |
/* Record that a scan happened */ |
616 |
scan_log(remote); |
617 |
|
618 |
if (OPT_DEBUG) |
619 |
log_printf("SCAN -> Negotiation failed %s:%d (%s) [%s] (%d bytes read)", |
620 |
remote->ip, remote->port, scan_gettype(remote->protocol), scs->name, |
621 |
remote->bytes_read); |
622 |
} |
623 |
|
624 |
/* scan_timeout CALLBACK |
625 |
* |
626 |
* Called by libopm when the negotiation of a specific protocol timed out. |
627 |
* |
628 |
* Parameters: |
629 |
* scanner: Scanner where the connection timed out. |
630 |
* remote: Remote struct containing information regarding remote end |
631 |
* |
632 |
* Return: NONE |
633 |
* |
634 |
*/ |
635 |
static void |
636 |
scan_timeout(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
637 |
{ |
638 |
const struct scanner_struct *scs = data; |
639 |
|
640 |
/* Record that a scan happened */ |
641 |
scan_log(remote); |
642 |
|
643 |
if (OPT_DEBUG) |
644 |
log_printf("SCAN -> Negotiation timed out %s:%d (%s) [%s] (%d bytes read)", |
645 |
remote->ip, remote->port, scan_gettype(remote->protocol), scs->name, |
646 |
remote->bytes_read); |
647 |
} |
648 |
|
649 |
/* scan_end CALLBACK |
650 |
* |
651 |
* Called by libopm when a specific SCAN has completed (all protocols in |
652 |
* that scan). |
653 |
* |
654 |
* Parameters: |
655 |
* scanner: Scanner the scan ended on. |
656 |
* remote: Remote struct containing information regarding remote end |
657 |
* |
658 |
* Return: NONE |
659 |
*/ |
660 |
static void |
661 |
scan_end(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
662 |
{ |
663 |
struct scan_struct *ss; |
664 |
struct scanner_struct *scs; |
665 |
|
666 |
scs = data; |
667 |
ss = remote->data; |
668 |
|
669 |
if (OPT_DEBUG) |
670 |
log_printf("SCAN -> Scan %s [%s] completed", remote->ip, scs->name); |
671 |
|
672 |
--ss->scans; |
673 |
scan_checkfinished(ss); |
674 |
} |
675 |
|
676 |
/* scan_handle_error CALLBACK |
677 |
* |
678 |
* Called by libopm when an error occurs with a specific connection. This |
679 |
* does not mean the entire scan has ended. |
680 |
* |
681 |
* Parameters: |
682 |
* scanner: Scanner where the error occured. |
683 |
* remote: Remote struct containing information regarding remote end |
684 |
* err: OPM_ERROR code describing the error. |
685 |
* |
686 |
* Return: NONE |
687 |
*/ |
688 |
static void |
689 |
scan_handle_error(OPM_T *scanner, OPM_REMOTE_T *remote, int err, void *data) |
690 |
{ |
691 |
struct scan_struct *ss; |
692 |
struct scanner_struct *scs; |
693 |
|
694 |
scs = data; |
695 |
ss = remote->data; |
696 |
|
697 |
switch (err) |
698 |
{ |
699 |
case OPM_ERR_MAX_READ: |
700 |
if (OPT_DEBUG >= 2) |
701 |
log_printf("SCAN -> Max read on %s:%d (%s) [%s] (%d bytes read)", |
702 |
remote->ip, remote->port, scan_gettype(remote->protocol), |
703 |
scs->name, remote->bytes_read); |
704 |
|
705 |
if (ss->manual_target) |
706 |
irc_send("PRIVMSG %s :CHECK -> Negotiation failed %s:%d (%s) " |
707 |
"[%s] (%d bytes read)", ss->manual_target->name, |
708 |
remote->ip, remote->port, scan_gettype(remote->protocol), |
709 |
scs->name, remote->bytes_read); |
710 |
break; |
711 |
case OPM_ERR_BIND: |
712 |
log_printf("SCAN -> Bind error on %s:%d (%s) [%s]", remote->ip, |
713 |
remote->port, scan_gettype(remote->protocol), scs->name); |
714 |
break; |
715 |
case OPM_ERR_NOFD: |
716 |
log_printf("SCAN -> File descriptor allocation error %s:%d (%s) " |
717 |
"[%s]", remote->ip, remote->port, |
718 |
scan_gettype(remote->protocol), scs->name); |
719 |
|
720 |
if (ss->manual_target) |
721 |
irc_send("PRIVMSG %s :CHECK -> Scan failed %s:%d (%s) [%s] " |
722 |
"(file descriptor allocation error)", |
723 |
ss->manual_target->name, remote->ip, remote->port, |
724 |
scan_gettype(remote->protocol), scs->name); |
725 |
break; |
726 |
default: /* Unknown Error! */ |
727 |
if (OPT_DEBUG) |
728 |
log_printf("SCAN -> Unknown error %s:%d (%s) [%s]", remote->ip, |
729 |
remote->port, scan_gettype(remote->protocol), scs->name); |
730 |
break; |
731 |
} |
732 |
} |
733 |
|
734 |
/* scan_negative |
735 |
* |
736 |
* Remote host (defined by ss) has passed all tests. |
737 |
* |
738 |
* Parameters: |
739 |
* ss: scan_struct containing information regarding negative host. |
740 |
* |
741 |
* Return: NONE |
742 |
* |
743 |
*/ |
744 |
static void |
745 |
scan_negative(const struct scan_struct *ss) |
746 |
{ |
747 |
/* Insert IP in negcache */ |
748 |
if (OptionsItem->negcache) |
749 |
{ |
750 |
if (OPT_DEBUG >= 2) |
751 |
log_printf("SCAN -> Adding %s to negative cache", ss->ip); |
752 |
|
753 |
negcache_insert(ss->ip); |
754 |
} |
755 |
} |
756 |
|
757 |
/* scan_irckline |
758 |
* |
759 |
* ss has been found as a positive host and is to be klined. |
760 |
* Format a kline message using the kline message provided |
761 |
* as a format, then pass it to irc_send() to be sent to the remote server. |
762 |
* |
763 |
* Parameters: |
764 |
* ss: scan_struct containing information regarding host to be klined |
765 |
* format: kline message to format |
766 |
* type: type of proxy found (%t format character) |
767 |
* |
768 |
* Return: NONE |
769 |
*/ |
770 |
static void |
771 |
scan_irckline(const struct scan_struct *ss, const char *format, const char *type) |
772 |
{ |
773 |
char message[MSGLENMAX] = ""; /* OUTPUT */ |
774 |
|
775 |
unsigned int pos = 0; /* position in format */ |
776 |
unsigned int len = 0; /* position in message */ |
777 |
unsigned int size = 0; /* temporary size buffer */ |
778 |
struct kline_format_assoc |
779 |
{ |
780 |
const char key; |
781 |
const char *data; |
782 |
} table[] = |
783 |
{ |
784 |
{ 'i', ss->ip }, |
785 |
{ 'h', ss->irc_hostname }, |
786 |
{ 'u', ss->irc_username }, |
787 |
{ 'n', ss->irc_nick }, |
788 |
{ 't', type }, |
789 |
{ '\0', NULL } |
790 |
}; |
791 |
|
792 |
/* |
793 |
* Copy format to message character by character, inserting any matching |
794 |
* data after %. |
795 |
*/ |
796 |
while (format[pos] != '\0' && len < (MSGLENMAX - 2)) |
797 |
{ |
798 |
switch (format[pos]) |
799 |
{ |
800 |
case '%': |
801 |
/* % is the last char in the string, move on */ |
802 |
if (format[pos + 1] == '\0') |
803 |
continue; |
804 |
|
805 |
/* %% escapes % and becomes % */ |
806 |
if (format[pos + 1] == '%') |
807 |
{ |
808 |
message[len++] = '%'; |
809 |
++pos; /* Skip past the escaped % */ |
810 |
break; |
811 |
} |
812 |
|
813 |
/* Safe to check against table now */ |
814 |
for (const struct kline_format_assoc *tab = table; tab->key; ++tab) |
815 |
{ |
816 |
if (tab->key == format[pos + 1]) |
817 |
{ |
818 |
size = strlen(tab->data); |
819 |
|
820 |
/* Check if the new string can fit! */ |
821 |
if ((size + len) > (MSGLENMAX - 1)) |
822 |
break; |
823 |
else |
824 |
{ |
825 |
strlcat(message, tab->data, sizeof(message)); |
826 |
len += size; |
827 |
} |
828 |
} |
829 |
} |
830 |
|
831 |
/* Skip key character */ |
832 |
++pos; |
833 |
break; |
834 |
|
835 |
default: |
836 |
message[len++] = format[pos]; |
837 |
message[len] = '\0'; |
838 |
break; |
839 |
} |
840 |
|
841 |
/* Continue to next character in format */ |
842 |
++pos; |
843 |
} |
844 |
|
845 |
irc_send("%s", message); |
846 |
} |
847 |
|
848 |
/* scan_manual |
849 |
* |
850 |
* Create a manual scan. A manual scan is a scan where the |
851 |
* scan_struct contains a manual_target pointer. |
852 |
*/ |
853 |
void |
854 |
scan_manual(char *param, const struct ChannelConf *target) |
855 |
{ |
856 |
char buf[INET6_ADDRSTRLEN]; |
857 |
const void *addr = NULL; |
858 |
struct scan_struct *ss; |
859 |
struct scanner_struct *scs; |
860 |
const char *ip = NULL; |
861 |
char *scannername; |
862 |
node_t *node; |
863 |
int ret; |
864 |
|
865 |
/* If there were no parameters sent, simply alert the user and return */ |
866 |
if (param == NULL) |
867 |
{ |
868 |
irc_send("PRIVMSG %s :OPM -> Invalid parameters.", target->name); |
869 |
return; |
870 |
} |
871 |
|
872 |
/* |
873 |
* Try to extract a scanner name from param, otherwise we'll be |
874 |
* adding to all scanners |
875 |
*/ |
876 |
ip = param; |
877 |
|
878 |
if ((scannername = strchr(param, ' '))) |
879 |
{ |
880 |
*scannername = '\0'; |
881 |
scannername++; |
882 |
} |
883 |
|
884 |
/* If IP is a hostname, resolve it using gethostbyname (which will block!) */ |
885 |
if ((addr = firedns_resolveip4(ip)) == NULL) |
886 |
{ |
887 |
irc_send("PRIVMSG %s :CHECK -> Error resolving host '%s': %s", |
888 |
target->name, ip, firedns_strerror(firedns_errno)); |
889 |
return; |
890 |
} |
891 |
|
892 |
/* IP = the resolved IP now (it was the IP or hostname before) */ |
893 |
if ((ip = inet_ntop(AF_INET, addr, buf, sizeof(buf))) == NULL) |
894 |
{ |
895 |
irc_send("PRIVMSG %s :CHECK -> invalid address: %s", |
896 |
target->name, strerror(errno)); |
897 |
return; |
898 |
} |
899 |
|
900 |
ss = xcalloc(sizeof(*ss)); |
901 |
ss->ip = xstrdup(ip); |
902 |
ss->remote = opm_remote_create(ss->ip); |
903 |
ss->remote->data = ss; |
904 |
ss->manual_target = target; |
905 |
|
906 |
if (scannername) |
907 |
irc_send("PRIVMSG %s :CHECK -> Checking '%s' for open proxies [%s]", |
908 |
target->name, ip, scannername); |
909 |
else |
910 |
irc_send("PRIVMSG %s :CHECK -> Checking '%s' for open proxies on all " |
911 |
"scanners", target->name, ip); |
912 |
|
913 |
if (LIST_SIZE(OpmItem->blacklists) > 0) |
914 |
dnsbl_add(ss); |
915 |
|
916 |
/* Add ss->remote to all scanners */ |
917 |
LIST_FOREACH(node, SCANNERS->head) |
918 |
{ |
919 |
scs = node->data; |
920 |
|
921 |
/* |
922 |
* If we have a scannername, only allow that scanner |
923 |
* to be used |
924 |
*/ |
925 |
if (scannername) |
926 |
if (strcasecmp(scannername, scs->name)) |
927 |
continue; |
928 |
|
929 |
if (OPT_DEBUG) |
930 |
log_printf("SCAN -> Passing %s to scanner [%s] (MANUAL SCAN)", ip, scs->name); |
931 |
|
932 |
if ((ret = opm_scan(scs->scanner, ss->remote)) != OPM_SUCCESS) |
933 |
{ |
934 |
switch (ret) |
935 |
{ |
936 |
case OPM_ERR_NOPROTOCOLS: |
937 |
break; |
938 |
case OPM_ERR_BADADDR: |
939 |
irc_send("PRIVMSG %s :OPM -> Bad address %s [%s]", |
940 |
ss->manual_target->name, ss->ip, scs->name); |
941 |
break; |
942 |
default: |
943 |
irc_send("PRIVMSG %s :OPM -> Unknown error %s [%s]", |
944 |
ss->manual_target->name, ss->ip, scs->name); |
945 |
break; |
946 |
} |
947 |
} |
948 |
else |
949 |
++ss->scans; /* Increase scan count only if OPM_SUCCESS */ |
950 |
} |
951 |
|
952 |
/* |
953 |
* If all of the scanners gave !OPM_SUCCESS and there were no dnsbl checks, |
954 |
* cleanup here |
955 |
*/ |
956 |
if (ss->scans == 0) |
957 |
{ |
958 |
if (scannername) |
959 |
irc_send("PRIVMSG %s :CHECK -> No such scanner '%s', or '%s' has " |
960 |
"0 protocols.", ss->manual_target->name, scannername, |
961 |
scannername); |
962 |
|
963 |
irc_send("PRIVMSG %s :CHECK -> No scans active on '%s', aborting scan.", |
964 |
ss->manual_target->name, ss->ip); |
965 |
scan_free(ss); |
966 |
} |
967 |
} |
968 |
|
969 |
/* scan_log |
970 |
* |
971 |
* Log the fact that a given ip/port/protocol has just been scanned, if the |
972 |
* user has asked for this to be logged. |
973 |
* |
974 |
* Parameters: |
975 |
* remote: OPM_REMOTE_T for the remote end |
976 |
*/ |
977 |
static void |
978 |
scan_log(OPM_REMOTE_T *remote) |
979 |
{ |
980 |
struct scan_struct *ss = remote->data; |
981 |
|
982 |
if (!(OptionsItem->scanlog && scanlogfile)) |
983 |
return; |
984 |
|
985 |
fprintf(scanlogfile, "[%s] %s:%d (%s) \"%s\"\n", date_iso8601(0), remote->ip, |
986 |
remote->port, scan_gettype(remote->protocol), ss->proof); |
987 |
fflush(scanlogfile); |
988 |
} |