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/* |
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* Copyright (C) 2002 Erik Fears |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (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 |
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* |
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* The Free Software Foundation, Inc. |
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* 59 Temple Place - Suite 330 |
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* Boston, MA 02111-1307, USA. |
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* |
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* |
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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 <poll.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 "opercmd.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 "malloc.h" |
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#include "match.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 = NULL; /* List of OPM_T */ |
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static list_t *MASKS = NULL; /* 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(char *[], char *); |
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static void scan_free(struct scan_struct *); |
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static void scan_irckline(struct scan_struct *, const char *, const char *); |
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static void scan_negative(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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void scan_open_proxy(OPM_T *, OPM_REMOTE_T *, int, void *); |
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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 *p; |
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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(p, SCANNERS->head) |
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{ |
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struct scanner_struct *scs = p->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 unsigned int nc_counter; |
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|
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if (OptionsItem->negcache > 0) |
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{ |
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if (nc_counter++ >= NEG_CACHE_REBUILD) |
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{ |
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/* |
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* Time to rebuild the negative |
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* 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 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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}; |
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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_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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char *mask; |
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char *scannername; |
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|
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/* FIXME: If rehash code is ever added, cleanup would need done here. */ |
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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); |
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} |
244 |
|
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/* Give scanners a list of masks they scan */ |
246 |
LIST_FOREACH(p, SCANNERS->head) |
247 |
{ |
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scs = p->data; |
249 |
|
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LIST_FOREACH(p2, UserItemList->head) |
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{ |
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uc = p2->data; |
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|
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LIST_FOREACH(p3, uc->scanners->head) |
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{ |
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scannername = p3->data; |
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|
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/* Add all these masks to scanner */ |
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if (strcasecmp(scannername, scs->name) == 0) |
260 |
{ |
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LIST_FOREACH(p4, uc->masks->head) |
262 |
{ |
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mask = p4->data; |
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|
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if (OPT_DEBUG) |
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log_printf("SCAN -> Linking the mask [%s] to scanner [%s]", mask, scannername); |
267 |
|
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node = node_create(xstrdup(mask)); |
269 |
list_add(scs->masks, node); |
270 |
} |
271 |
|
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break; |
273 |
} |
274 |
} |
275 |
} |
276 |
} |
277 |
|
278 |
/* Initialise negative cache */ |
279 |
if (OptionsItem->negcache > 0) |
280 |
{ |
281 |
if (OPT_DEBUG >= 2) |
282 |
log_printf("SCAN -> Initializing negative cache"); |
283 |
|
284 |
nc_init(&nc_head); |
285 |
} |
286 |
} |
287 |
|
288 |
/* scan_connect |
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* |
290 |
* scan_connect is called when m_notice (irc.c) matches a connection |
291 |
* notice and parses the connecting user out of it. |
292 |
* |
293 |
* Parameters: |
294 |
* user: Parsed items from the connection notice: |
295 |
* user[0] = connecting users nickname |
296 |
* user[1] = connecting users username |
297 |
* user[2] = connecting users hostname |
298 |
* user[3] = connecting users IP |
299 |
* msg = Original connect notice |
300 |
* Return: NONE |
301 |
* |
302 |
*/ |
303 |
void |
304 |
scan_connect(char *user[], char *msg) |
305 |
{ |
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struct sockaddr_in ip; |
307 |
node_t *p, *p2; |
308 |
struct scan_struct *ss; |
309 |
struct scanner_struct *scs; |
310 |
char *scsmask; |
311 |
int ret; |
312 |
|
313 |
/* |
314 |
* Have to use MSGLENMAX here because it is unknown what the max size of |
315 |
* username/hostname can be. Some ircds use really mad values for |
316 |
* these. |
317 |
*/ |
318 |
char mask[MSGLENMAX]; |
319 |
char ipmask[MSGLENMAX]; |
320 |
|
321 |
/* Check negcache before anything */ |
322 |
if (OptionsItem->negcache > 0) |
323 |
{ |
324 |
if (inet_pton(AF_INET, user[3], &ip.sin_addr) <= 0) |
325 |
{ |
326 |
log_printf("SCAN -> Invalid IPv4 address '%s'!", user[3]); |
327 |
return; |
328 |
} |
329 |
else |
330 |
{ |
331 |
if (check_neg_cache(ip.sin_addr.s_addr)) |
332 |
{ |
333 |
if (OPT_DEBUG) |
334 |
log_printf("SCAN -> %s!%s@%s (%s) is negatively cached. " |
335 |
"Skipping all tests.", user[0], user[1], user[2], |
336 |
user[3]); |
337 |
return; |
338 |
} |
339 |
} |
340 |
} |
341 |
|
342 |
/* Generate user mask */ |
343 |
snprintf(mask, MSGLENMAX, "%s!%s@%s", user[0], user[1], user[2]); |
344 |
snprintf(ipmask, MSGLENMAX, "%s!%s@%s", user[0], user[1], user[3]); |
345 |
|
346 |
/* Check exempt list now that we have a mask */ |
347 |
if (scan_checkexempt(mask, ipmask)) |
348 |
{ |
349 |
if (OPT_DEBUG) |
350 |
log_printf("SCAN -> %s is exempt from scanning", mask); |
351 |
|
352 |
return; |
353 |
} |
354 |
|
355 |
/* create scan_struct */ |
356 |
ss = scan_create(user, msg); |
357 |
|
358 |
/* Store ss in the remote struct, so that in callbacks we have ss */ |
359 |
ss->remote->data = ss; |
360 |
|
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/* Start checking our DNSBLs */ |
362 |
if (LIST_SIZE(OpmItem->blacklists) > 0) |
363 |
dnsbl_add(ss); |
364 |
|
365 |
/* Add ss->remote to all matching scanners */ |
366 |
LIST_FOREACH(p, SCANNERS->head) |
367 |
{ |
368 |
scs = p->data; |
369 |
|
370 |
LIST_FOREACH(p2, scs->masks->head) |
371 |
{ |
372 |
scsmask = p2->data; |
373 |
|
374 |
if (!match(scsmask, mask)) |
375 |
{ |
376 |
if (OPT_DEBUG) |
377 |
log_printf("SCAN -> Passing %s to scanner [%s]", mask, scs->name); |
378 |
|
379 |
if ((ret = opm_scan(scs->scanner, ss->remote)) != OPM_SUCCESS) |
380 |
{ |
381 |
switch (ret) |
382 |
{ |
383 |
case OPM_ERR_NOPROTOCOLS: |
384 |
continue; |
385 |
break; |
386 |
case OPM_ERR_BADADDR: |
387 |
log_printf("OPM -> Bad address %s [%s].", |
388 |
(ss->manual_target ? ss->manual_target->name : |
389 |
"(unknown)"), ss->ip); |
390 |
break; |
391 |
default: |
392 |
log_printf("OPM -> Unknown error %s [%s].", |
393 |
(ss->manual_target ? ss->manual_target->name : |
394 |
"(unknown)"), ss->ip); |
395 |
break; |
396 |
} |
397 |
} |
398 |
else |
399 |
++ss->scans; /* Increase scan count only if OPM_SUCCESS */ |
400 |
|
401 |
break; /* Continue to next scanner */ |
402 |
} |
403 |
} |
404 |
} |
405 |
|
406 |
/* All scanners returned !OPM_SUCCESS and there were no dnsbl checks */ |
407 |
if (ss->scans == 0) |
408 |
scan_free(ss); |
409 |
} |
410 |
|
411 |
/* scan_create |
412 |
* |
413 |
* Allocate scan struct, including user information and REMOTE |
414 |
* for LIBOPM. |
415 |
* |
416 |
* Parameters: |
417 |
* user: Parsed items from the connection notice: |
418 |
* user[0] = connecting users nickname |
419 |
* user[1] = connecting users username |
420 |
* user[2] = connecting users hostname |
421 |
* user[3] = connecting users IP |
422 |
* msg = Original connect notice (used as PROOF) |
423 |
* |
424 |
* Return: Pointer to new scan_struct |
425 |
* |
426 |
*/ |
427 |
static struct scan_struct * |
428 |
scan_create(char *user[], char *msg) |
429 |
{ |
430 |
struct scan_struct *ss = xcalloc(sizeof *ss); |
431 |
|
432 |
ss->irc_nick = xstrdup(user[0]); |
433 |
ss->irc_username = xstrdup(user[1]); |
434 |
ss->irc_hostname = xstrdup(user[2]); |
435 |
ss->ip = xstrdup(user[3]); |
436 |
ss->proof = xstrdup(msg); |
437 |
ss->remote = opm_remote_create(ss->ip); |
438 |
|
439 |
assert(ss->remote); |
440 |
return ss; |
441 |
} |
442 |
|
443 |
/* scan_free |
444 |
* |
445 |
* Free a scan_struct. This should only be done if the scan struct has |
446 |
* no scans left! |
447 |
* |
448 |
* Parameters: |
449 |
* ss: scan_struct to free |
450 |
* |
451 |
* Return: NONE |
452 |
*/ |
453 |
static void |
454 |
scan_free(struct scan_struct *ss) |
455 |
{ |
456 |
if (ss == NULL) |
457 |
return; |
458 |
|
459 |
MyFree(ss->irc_nick); |
460 |
MyFree(ss->irc_username); |
461 |
MyFree(ss->irc_hostname); |
462 |
MyFree(ss->ip); |
463 |
MyFree(ss->proof); |
464 |
|
465 |
opm_remote_free(ss->remote); |
466 |
MyFree(ss); |
467 |
} |
468 |
|
469 |
/* scan_checkfinished |
470 |
* |
471 |
* Check if a scan is complete (ss->scans <= 0) |
472 |
* and free it if need be. |
473 |
*/ |
474 |
void |
475 |
scan_checkfinished(struct scan_struct *ss) |
476 |
{ |
477 |
if (ss->scans <= 0) |
478 |
{ |
479 |
if (ss->manual_target) |
480 |
irc_send("PRIVMSG %s :CHECK -> All tests on %s completed.", |
481 |
ss->manual_target->name, ss->ip); |
482 |
else |
483 |
{ |
484 |
if (OPT_DEBUG) |
485 |
/* If there was a manual_target, then irc_nick, etc is NULL. */ |
486 |
log_printf("SCAN -> All tests on %s!%s@%s complete.", |
487 |
ss->irc_nick, ss->irc_username, ss->irc_hostname); |
488 |
|
489 |
/* Scan was a negative */ |
490 |
if (ss->positive == 0) |
491 |
scan_negative(ss); |
492 |
} |
493 |
|
494 |
scan_free(ss); |
495 |
} |
496 |
} |
497 |
|
498 |
/* scan_positive |
499 |
* |
500 |
* Remote host (defined by ss) has been found positive by one or more |
501 |
* tests. |
502 |
* |
503 |
* Parameters: |
504 |
* ss: scan_struct containing information regarding positive host |
505 |
* kline: command to send to IRC server to ban the user (see scan_irckline) |
506 |
* type: string of the type of proxy found to be running on the host |
507 |
* |
508 |
* Return: NONE |
509 |
* |
510 |
*/ |
511 |
void |
512 |
scan_positive(struct scan_struct *ss, const char *kline, const char *type) |
513 |
{ |
514 |
node_t *node; |
515 |
|
516 |
/* If already a positive, don't kline/close again */ |
517 |
if (ss->positive) |
518 |
return; |
519 |
|
520 |
/* Format KLINE and send to IRC server */ |
521 |
scan_irckline(ss, kline, type); |
522 |
|
523 |
/* Speed up the cleanup procedure */ |
524 |
/* Close all scans prematurely */ |
525 |
LIST_FOREACH(node, SCANNERS->head) |
526 |
{ |
527 |
OPM_T *scanner = ((struct scanner_struct *)node->data)->scanner; |
528 |
opm_end(scanner, ss->remote); |
529 |
} |
530 |
|
531 |
/* Set it as a positive (to avoid a scan_negative call later on */ |
532 |
ss->positive = 1; |
533 |
} |
534 |
|
535 |
/* scan_open_proxy CALLBACK |
536 |
* |
537 |
* Called by libopm when a proxy is verified open. |
538 |
* |
539 |
* Parameters: |
540 |
* scanner: Scanner that found the open proxy. |
541 |
* remote: Remote struct containing information regarding remote end |
542 |
* |
543 |
* Return: NONE |
544 |
*/ |
545 |
void |
546 |
scan_open_proxy(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
547 |
{ |
548 |
struct scan_struct *ss; |
549 |
struct scanner_struct *scs; |
550 |
|
551 |
/* Record that a scan happened */ |
552 |
scan_log(remote); |
553 |
|
554 |
scs = data; |
555 |
ss = remote->data; |
556 |
|
557 |
if (ss->manual_target == NULL) |
558 |
{ |
559 |
/* kline and close scan */ |
560 |
scan_positive(ss, IRCItem->kline, scan_gettype(remote->protocol)); |
561 |
|
562 |
/* Report to blacklist */ |
563 |
dnsbl_report(ss); |
564 |
|
565 |
irc_send_channels("OPEN PROXY -> %s!%s@%s %s:%d (%s) [%s]", |
566 |
ss->irc_nick, ss->irc_username, ss->irc_hostname, remote->ip, |
567 |
remote->port, scan_gettype(remote->protocol), scs->name); |
568 |
log_printf("SCAN -> OPEN PROXY %s!%s@%s %s:%d (%s) [%s]", |
569 |
ss->irc_nick, ss->irc_username, ss->irc_hostname, remote->ip, |
570 |
remote->port, scan_gettype(remote->protocol), scs->name); |
571 |
} |
572 |
else |
573 |
{ |
574 |
irc_send("PRIVMSG %s :CHECK -> OPEN PROXY %s:%d (%s) [%s]", |
575 |
ss->manual_target->name, remote->ip, remote->port, |
576 |
scan_gettype(remote->protocol), scs->name); |
577 |
log_printf("SCAN -> OPEN PROXY %s:%d (%s) [%s]", remote->ip, |
578 |
remote->port, scan_gettype(remote->protocol), scs->name); |
579 |
} |
580 |
|
581 |
/* Record the proxy for stats purposes */ |
582 |
stats_openproxy(remote->protocol); |
583 |
} |
584 |
|
585 |
/* scan_negotiation_failed CALLBACK |
586 |
* |
587 |
* Called by libopm when negotiation of a specific protocol failed. |
588 |
* |
589 |
* Parameters: |
590 |
* scanner: Scanner where the negotiation failed. |
591 |
* remote: Remote struct containing information regarding remote end |
592 |
* |
593 |
* Return: NONE |
594 |
* |
595 |
*/ |
596 |
void |
597 |
scan_negotiation_failed(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
598 |
{ |
599 |
//struct scan_struct *ss; |
600 |
struct scanner_struct *scs; |
601 |
|
602 |
/* Record that a scan happened */ |
603 |
scan_log(remote); |
604 |
|
605 |
scs = data; |
606 |
//ss = remote->data; |
607 |
|
608 |
if (OPT_DEBUG) |
609 |
log_printf("SCAN -> Negotiation failed %s:%d (%s) [%s] (%d bytes read)", |
610 |
remote->ip, remote->port, scan_gettype(remote->protocol), |
611 |
scs->name, remote->bytes_read); |
612 |
/* |
613 |
if (ss->manual_target) |
614 |
irc_send("PRIVMSG %s :CHECK -> Negotiation failed %s:%d (%s) [%s] " |
615 |
"(%d bytes read)", ss->manual_target->name, remote->ip, |
616 |
remote->port, scan_gettype(remote->protocol), scs->name, |
617 |
remote->bytes_read); |
618 |
*/ |
619 |
} |
620 |
|
621 |
/* scan_timeout CALLBACK |
622 |
* |
623 |
* Called by libopm when the negotiation of a specific protocol timed out. |
624 |
* |
625 |
* Parameters: |
626 |
* scanner: Scanner where the connection timed out. |
627 |
* remote: Remote struct containing information regarding remote end |
628 |
* |
629 |
* Return: NONE |
630 |
* |
631 |
*/ |
632 |
static void |
633 |
scan_timeout(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
634 |
{ |
635 |
//struct scan_struct *ss; |
636 |
struct scanner_struct *scs; |
637 |
|
638 |
/* Record that a scan happened */ |
639 |
scan_log(remote); |
640 |
|
641 |
scs = data; |
642 |
//ss = remote->data; |
643 |
|
644 |
if (OPT_DEBUG) |
645 |
log_printf("SCAN -> Negotiation timed out %s:%d (%s) [%s] (%d bytes read)", |
646 |
remote->ip, remote->port, |
647 |
scan_gettype(remote->protocol), scs->name, |
648 |
remote->bytes_read); |
649 |
/* |
650 |
if (ss->manual_target) |
651 |
irc_send("PRIVMSG %s :CHECK -> Negotiation timed out %s:%d (%s) [%s] " |
652 |
"(%d bytes read)", ss->manual_target->name, remote->ip, |
653 |
remote->port, scan_gettype(remote->protocol), scs->name, |
654 |
remote->bytes_read); |
655 |
*/ |
656 |
} |
657 |
|
658 |
/* scan_end CALLBACK |
659 |
* |
660 |
* Called by libopm when a specific SCAN has completed (all protocols in |
661 |
* that scan). |
662 |
* |
663 |
* Parameters: |
664 |
* scanner: Scanner the scan ended on. |
665 |
* remote: Remote struct containing information regarding remote end |
666 |
* |
667 |
* Return: NONE |
668 |
*/ |
669 |
static void |
670 |
scan_end(OPM_T *scanner, OPM_REMOTE_T *remote, int notused, void *data) |
671 |
{ |
672 |
struct scan_struct *ss; |
673 |
struct scanner_struct *scs; |
674 |
|
675 |
scs = data; |
676 |
ss = remote->data; |
677 |
|
678 |
if (OPT_DEBUG) |
679 |
log_printf("SCAN -> Scan %s [%s] completed", remote->ip, scs->name); |
680 |
|
681 |
--ss->scans; |
682 |
scan_checkfinished(ss); |
683 |
} |
684 |
|
685 |
/* scan_handle_error CALLBACK |
686 |
* |
687 |
* Called by libopm when an error occurs with a specific connection. This |
688 |
* does not mean the entire scan has ended. |
689 |
* |
690 |
* Parameters: |
691 |
* scanner: Scanner where the error occured. |
692 |
* remote: Remote struct containing information regarding remote end |
693 |
* err: OPM_ERROR code describing the error. |
694 |
* |
695 |
* Return: NONE |
696 |
*/ |
697 |
static void |
698 |
scan_handle_error(OPM_T *scanner, OPM_REMOTE_T *remote, int err, void *data) |
699 |
{ |
700 |
struct scan_struct *ss; |
701 |
struct scanner_struct *scs; |
702 |
|
703 |
scs = data; |
704 |
ss = remote->data; |
705 |
|
706 |
switch (err) |
707 |
{ |
708 |
case OPM_ERR_MAX_READ: |
709 |
if (OPT_DEBUG >= 2) |
710 |
log_printf("SCAN -> Max read on %s:%d (%s) [%s] (%d bytes read)", |
711 |
remote->ip, remote->port, scan_gettype(remote->protocol), |
712 |
scs->name, remote->bytes_read); |
713 |
|
714 |
if (ss->manual_target) |
715 |
irc_send("PRIVMSG %s :CHECK -> Negotiation failed %s:%d (%s) " |
716 |
"[%s] (%d bytes read)", ss->manual_target->name, |
717 |
remote->ip, remote->port, scan_gettype(remote->protocol), |
718 |
scs->name, remote->bytes_read); |
719 |
break; |
720 |
case OPM_ERR_BIND: |
721 |
log_printf("SCAN -> Bind error on %s:%d (%s) [%s]", remote->ip, |
722 |
remote->port, scan_gettype(remote->protocol), scs->name); |
723 |
break; |
724 |
case OPM_ERR_NOFD: |
725 |
log_printf("SCAN -> File descriptor allocation error %s:%d (%s) " |
726 |
"[%s]", remote->ip, remote->port, |
727 |
scan_gettype(remote->protocol), scs->name); |
728 |
|
729 |
if (ss->manual_target) |
730 |
irc_send("PRIVMSG %s :CHECK -> Scan failed %s:%d (%s) [%s] " |
731 |
"(file descriptor allocation error)", |
732 |
ss->manual_target->name, remote->ip, remote->port, |
733 |
scan_gettype(remote->protocol), scs->name); |
734 |
break; |
735 |
default: /* Unknown Error! */ |
736 |
if (OPT_DEBUG) |
737 |
log_printf("SCAN -> Unknown error %s:%d (%s) [%s]", remote->ip, |
738 |
remote->port, scan_gettype(remote->protocol), scs->name); |
739 |
break; |
740 |
} |
741 |
} |
742 |
|
743 |
/* scan_negative |
744 |
* |
745 |
* Remote host (defined by ss) has passed all tests. |
746 |
* |
747 |
* Parameters: |
748 |
* ss: scan_struct containing information regarding negative host. |
749 |
* |
750 |
* Return: NONE |
751 |
* |
752 |
*/ |
753 |
static void |
754 |
scan_negative(struct scan_struct *ss) |
755 |
{ |
756 |
/* Insert IP in negcache */ |
757 |
if (OptionsItem->negcache > 0) |
758 |
{ |
759 |
if (OPT_DEBUG >= 2) |
760 |
log_printf("SCAN -> Adding %s to negative cache", ss->ip); |
761 |
|
762 |
negcache_insert(ss->ip); |
763 |
} |
764 |
} |
765 |
|
766 |
/* scan_irckline |
767 |
* |
768 |
* ss has been found as a positive host and is to be klined. |
769 |
* Format a kline message using the kline message provided |
770 |
* as a format, then pass it to irc_send() to be sent to the remote server. |
771 |
* |
772 |
* Parameters: |
773 |
* ss: scan_struct containing information regarding host to be klined |
774 |
* format: kline message to format |
775 |
* type: type of proxy found (%t format character) |
776 |
* |
777 |
* Return: NONE |
778 |
* |
779 |
*/ |
780 |
static void |
781 |
scan_irckline(struct scan_struct *ss, const char *format, const char *type) |
782 |
{ |
783 |
char message[MSGLENMAX]; /* OUTPUT */ |
784 |
|
785 |
unsigned int pos = 0; /* position in format */ |
786 |
unsigned int len = 0; /* position in message */ |
787 |
unsigned int size = 0; /* temporary size buffer */ |
788 |
unsigned int i; |
789 |
struct kline_format_assoc table[] = |
790 |
{ |
791 |
{'i', NULL }, |
792 |
{'h', NULL }, |
793 |
{'u', NULL }, |
794 |
{'n', NULL }, |
795 |
{'t', NULL } |
796 |
}; |
797 |
|
798 |
table[0].data = ss->ip; |
799 |
table[1].data = ss->irc_hostname; |
800 |
table[2].data = ss->irc_username; |
801 |
table[3].data = ss->irc_nick; |
802 |
table[4].data = type; |
803 |
|
804 |
/* |
805 |
* Copy format to message character by character, inserting any matching |
806 |
* data after %. |
807 |
*/ |
808 |
while (format[pos] != '\0' && len < (MSGLENMAX - 2)) |
809 |
{ |
810 |
switch (format[pos]) |
811 |
{ |
812 |
case '%': |
813 |
/* % is the last char in the string, move on */ |
814 |
if (format[pos + 1] == '\0') |
815 |
continue; |
816 |
|
817 |
/* %% escapes % and becomes % */ |
818 |
if (format[pos + 1] == '%') |
819 |
{ |
820 |
message[len++] = '%'; |
821 |
++pos; /* Skip past the escaped % */ |
822 |
break; |
823 |
} |
824 |
|
825 |
/* Safe to check against table now */ |
826 |
for (i = 0; i < (sizeof(table) / sizeof(struct kline_format_assoc)); ++i) |
827 |
{ |
828 |
if (table[i].key == format[pos + 1]) |
829 |
{ |
830 |
size = strlen(table[i].data); |
831 |
|
832 |
/* Check if the new string can fit! */ |
833 |
if ((size + len) > (MSGLENMAX - 1)) |
834 |
break; |
835 |
else |
836 |
{ |
837 |
strlcat(message, table[i].data, sizeof(message)); |
838 |
len += size; |
839 |
} |
840 |
} |
841 |
} |
842 |
|
843 |
/* Skip key character */ |
844 |
++pos; |
845 |
break; |
846 |
|
847 |
default: |
848 |
message[len++] = format[pos]; |
849 |
message[len] = '\0'; |
850 |
break; |
851 |
} |
852 |
|
853 |
/* Continue to next character in format */ |
854 |
++pos; |
855 |
} |
856 |
|
857 |
irc_send("%s", message); |
858 |
} |
859 |
|
860 |
/* scan_manual |
861 |
* |
862 |
* Create a manual scan. A manual scan is a scan where the |
863 |
* scan_struct contains a manual_target pointer. |
864 |
*/ |
865 |
void |
866 |
scan_manual(char *param, struct ChannelConf *target) |
867 |
{ |
868 |
struct in_addr *addr; |
869 |
struct scan_struct *ss; |
870 |
struct scanner_struct *scs; |
871 |
char *ip; |
872 |
char *scannername; |
873 |
node_t *p; |
874 |
int ret; |
875 |
|
876 |
/* If there were no parameters sent, simply alert the user and return */ |
877 |
if (param == NULL) |
878 |
{ |
879 |
irc_send("PRIVMSG %s :OPM -> Invalid parameters.", target->name); |
880 |
return; |
881 |
} |
882 |
|
883 |
/* |
884 |
* Try to extract a scanner name from param, otherwise we'll be |
885 |
* adding to all scanners |
886 |
*/ |
887 |
ip = param; |
888 |
|
889 |
if ((scannername = strchr(param, ' '))) |
890 |
{ |
891 |
*scannername = '\0'; |
892 |
scannername++; |
893 |
} |
894 |
|
895 |
/* If IP is a hostname, resolve it using gethostbyname (which will block!) */ |
896 |
if ((addr = firedns_resolveip4(ip)) == NULL) |
897 |
{ |
898 |
irc_send("PRIVMSG %s :CHECK -> Error resolving host '%s': %s", |
899 |
target->name, ip, firedns_strerror(fdns_errno)); |
900 |
return; |
901 |
} |
902 |
|
903 |
/* IP = the resolved IP now (it was the ip OR hostname before) */ |
904 |
ip = inet_ntoa(*addr); |
905 |
|
906 |
ss = xcalloc(sizeof *ss); |
907 |
ss->ip = xstrdup(ip); |
908 |
ss->remote = opm_remote_create(ss->ip); |
909 |
ss->remote->data = ss; |
910 |
ss->manual_target = target; |
911 |
|
912 |
assert(ss->remote); |
913 |
|
914 |
if (scannername) |
915 |
irc_send("PRIVMSG %s :CHECK -> Checking '%s' for open proxies [%s]", |
916 |
target->name, ip, scannername); |
917 |
else |
918 |
irc_send("PRIVMSG %s :CHECK -> Checking '%s' for open proxies on all " |
919 |
"scanners", target->name, ip); |
920 |
|
921 |
if (LIST_SIZE(OpmItem->blacklists) > 0) |
922 |
dnsbl_add(ss); |
923 |
|
924 |
/* Add ss->remote to all scanners */ |
925 |
LIST_FOREACH(p, SCANNERS->head) |
926 |
{ |
927 |
scs = p->data; |
928 |
|
929 |
/* |
930 |
* If we have a scannername, only allow that scanner |
931 |
* to be used |
932 |
*/ |
933 |
if (scannername) |
934 |
if (strcasecmp(scannername, scs->name)) |
935 |
continue; |
936 |
|
937 |
if (OPT_DEBUG) |
938 |
log_printf("SCAN -> Passing %s to scanner [%s] (MANUAL SCAN)", ip, scs->name); |
939 |
|
940 |
if ((ret = opm_scan(scs->scanner, ss->remote)) != OPM_SUCCESS) |
941 |
{ |
942 |
switch (ret) |
943 |
{ |
944 |
case OPM_ERR_NOPROTOCOLS: |
945 |
break; |
946 |
case OPM_ERR_BADADDR: |
947 |
irc_send("PRIVMSG %s :OPM -> Bad address %s [%s]", |
948 |
ss->manual_target->name, ss->ip, scs->name); |
949 |
break; |
950 |
default: |
951 |
irc_send("PRIVMSG %s :OPM -> Unknown error %s [%s]", |
952 |
ss->manual_target->name, ss->ip, scs->name); |
953 |
break; |
954 |
} |
955 |
} |
956 |
else |
957 |
++ss->scans; /* Increase scan count only if OPM_SUCCESS */ |
958 |
} |
959 |
|
960 |
/* |
961 |
* If all of the scanners gave !OPM_SUCCESS and there were no dnsbl checks, |
962 |
* cleanup here |
963 |
*/ |
964 |
if (ss->scans == 0) |
965 |
{ |
966 |
if (scannername) |
967 |
irc_send("PRIVMSG %s :CHECK -> No such scanner '%s', or '%s' has " |
968 |
"0 protocols.", ss->manual_target->name, scannername, |
969 |
scannername); |
970 |
|
971 |
irc_send("PRIVMSG %s :CHECK -> No scans active on '%s', aborting scan.", |
972 |
ss->manual_target->name, ss->ip); |
973 |
scan_free(ss); |
974 |
} |
975 |
} |
976 |
|
977 |
/* scan_checkexempt |
978 |
* |
979 |
* Check mask against exempt list. |
980 |
* |
981 |
* Parameters: |
982 |
* mask: Mask to check |
983 |
* |
984 |
* Return: |
985 |
* 1 if mask is in list |
986 |
* 0 if mask is not in list |
987 |
*/ |
988 |
int |
989 |
scan_checkexempt(const char *mask, const char *ipmask) |
990 |
{ |
991 |
node_t *node; |
992 |
|
993 |
LIST_FOREACH(node, ExemptItem->masks->head) |
994 |
{ |
995 |
const char *exempt_mask = node->data; |
996 |
|
997 |
if (!match(exempt_mask, mask) || !match(exempt_mask, ipmask)) |
998 |
return 1; |
999 |
} |
1000 |
|
1001 |
return 0; |
1002 |
} |
1003 |
|
1004 |
/* scan_log |
1005 |
* |
1006 |
* Log the fact that a given ip/port/protocol has just been scanned, if the |
1007 |
* user has asked for this to be logged. |
1008 |
* |
1009 |
* Parameters: |
1010 |
* remote: OPM_REMOTE_T for the remote end |
1011 |
*/ |
1012 |
static void |
1013 |
scan_log(OPM_REMOTE_T *remote) |
1014 |
{ |
1015 |
char buf_present[25]; |
1016 |
time_t present; |
1017 |
struct tm *tm_present; |
1018 |
struct scan_struct *ss = remote->data; |
1019 |
|
1020 |
if (!(OptionsItem->scanlog && scanlogfile)) |
1021 |
return; |
1022 |
|
1023 |
time(&present); |
1024 |
tm_present = gmtime(&present); |
1025 |
strftime(buf_present, sizeof(buf_present), "%b %d %H:%M:%S %Y", tm_present); |
1026 |
|
1027 |
fprintf(scanlogfile, "[%s] %s:%d (%s) \"%s\"\n", buf_present, remote->ip, |
1028 |
remote->port, scan_gettype(remote->protocol), ss->proof); |
1029 |
fflush(scanlogfile); |
1030 |
} |