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/* Copyright (C) 2003, 2004 Stephane Thiell |
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* |
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* This file is part of pxyservd (from pxys) |
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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 the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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* |
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*/ |
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#define RCSID "$Id: scan.c,v 1.7 2004/01/12 12:31:03 mbuna Exp $" |
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|
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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|
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#ifndef IP_L1_CACHE_SIZE |
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#define IP_L1_CACHE_SIZE 10000 |
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#endif |
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#ifndef IP_L1_CACHE_EXPIRE_DELAY |
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#define IP_L1_CACHE_EXPIRE_DELAY 21600 |
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#endif |
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|
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#define IP4_L1_CACHE_SIZE IP_L1_CACHE_SIZE |
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#define IP6_L1_CACHE_SIZE IP_L1_CACHE_SIZE |
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|
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/* SCAN_TIMER_DELAY defines the delay of which pxyservd will check if |
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* some queries have failed (timeout) in order to retry. |
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*/ |
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#define SCAN_TIMER_DELAY 10 |
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|
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/* SCAN_QUERY_TIMEOUT defines a minimal timeout delay in seconds for a query. |
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* A query won't be resent until this time is elapsed. |
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* Should not be too low, or pxyscand will receive each time |
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* several queries for the same IP, for example. |
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* Shouldn't be too high, or it will alter the reactivity, when for |
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* example, pxyscand restarts. |
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* 3-5 minutes is probably a good value. |
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*/ |
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#define SCAN_QUERY_TIMEOUT 200 |
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|
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#include <assert.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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|
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#include "scan.h" |
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#include <arpa/inet.h> |
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|
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#include <opas/opas.h> |
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#include <peak/peak.h> |
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|
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#include "opas_support.h" |
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#include "cfgloader.h" |
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#include "debug.h" |
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#include "evreg.h" |
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#include "ipcache.h" |
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#include "irc_gline.h" |
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#include "irc_network.h" |
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#include "irc_numnicks.h" |
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#include "irc_send.h" |
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#include "irc_userbase.h" |
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#include "irc_yxx.h" |
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#include "match.h" |
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#include "pxyservd_log.h" |
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|
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#include "PXServiceMsg.h" |
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|
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extern void cmd_status_reply(struct Client *cptr, PXSStatus *status, |
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size_t length); |
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extern void cmd_pxstats_reply(struct Client *cptr, PXSStats *stats); |
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extern void cmd_grem_reply(struct Client *cptr, PXSRemove4 *rem_reply); |
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extern void cmd_recheck_reply(struct Client *cptr, PXSRemove4 *rem_reply); |
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|
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static void scan_timer_callback(peak_timer ti, void *context); |
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static int scan_check_cache(unsigned int flags, void *addrData, |
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time_t *out_scan_ts); |
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static void scan_query(unsigned int flags, const void *addrData, |
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uint32_t user_data); |
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static void scan_client_add(struct Client *cptr); |
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|
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uint32_t l1_cache_hits; /* stats */ |
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|
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/* no-proxy little caches */ |
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static ipcache_t ipcache4; |
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#ifdef ENABLE_IPV6 |
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static ipcache_t ipcache6; |
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#endif |
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static struct Client *scan_client_head, **scan_client_tail_p; |
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static int scan_client_count; |
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static int unscannable_client_count; |
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static peak_timer scan_timer; |
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|
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void |
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scan_init() |
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{ |
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ipcache4 = ipcache_create_in4(IP4_L1_CACHE_SIZE, 0); |
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#ifdef ENABLE_IPV6 |
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ipcache6 = ipcache_create_in6(IP6_L1_CACHE_SIZE, 0); |
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#endif |
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if (opas_support_init() == -1) |
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{ |
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Debug((DL_BASIC, "scan_init: opas_support_init failed!")); |
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/* XXX */ |
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abort(); |
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} |
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|
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scan_client_head = NULL; |
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scan_client_tail_p = NULL; |
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scan_client_count = 0; |
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l1_cache_hits = 0; |
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unscannable_client_count = 0; |
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|
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scan_timer = peak_timer_create(SCAN_TIMER_DELAY, SCAN_TIMER_DELAY, |
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scan_timer_callback, NULL); |
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peak_task_timer_add(peak_task_self(), scan_timer); |
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peak_release(scan_timer); /* so that peak_task_timer_remove() releases it */ |
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} |
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|
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void |
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scan_finalize() |
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{ |
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peak_task_timer_remove(peak_task_self(), scan_timer); /* implicit release */ |
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|
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opas_support_finalize(); |
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|
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#ifdef ENABLE_IPV6 |
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ipcache_dispose(ipcache6); |
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#endif |
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ipcache_dispose(ipcache4); |
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} |
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|
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static void |
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scan_timer_callback(peak_timer ti, void *context) |
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{ |
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struct Client *cptr, *cnext; |
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time_t now = peak_time(); |
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|
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if (!scan_client_count) |
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return; |
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|
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/* Check for timed out scan queries. |
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*/ |
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for (cptr = scan_client_head; cptr; cptr = cnext) |
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{ |
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cnext = cptr->scan_next; |
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|
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/* List is ordered, we know we can break. */ |
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if (cptr->scan_timestamp + SCAN_QUERY_TIMEOUT > now) |
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break; |
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|
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/* Try again ! It's our job damnit. */ |
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scan_client_remove(cptr); |
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scan_start(cptr); |
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} |
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} |
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|
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static int |
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scan_check_cache(unsigned int flags, void *addrData, time_t *out_scan_ts) |
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{ |
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time_t ts = 0; |
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|
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if (!(flags & CLIENT_FLAG_IPV6)) |
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ts = ipcache_find_in4(ipcache4, (struct in_addr *)addrData, NULL); |
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#ifdef ENABLE_IPV6 |
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else |
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ts = ipcache_find_in6(ipcache6, (struct in6_addr *)addrData, NULL); |
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#endif |
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|
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if (ts > 0 && (peak_time() - ts <= IP_L1_CACHE_EXPIRE_DELAY)) |
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{ |
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*out_scan_ts = ts; |
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return 1; |
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} |
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return 0; |
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} |
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|
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int |
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scan_check_noscan_server(struct Server *sptr) |
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{ |
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CNoScanLink *lk; |
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|
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for (lk = gConfig->noscanlist; lk; lk = lk->next) |
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{ |
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if (lk->noscan.type == NOSCAN_TYPE_SERVER |
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&& !match(lk->noscan.u.server, sptr->name)) |
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return 1; /* noscan! */ |
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} |
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return 0; |
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} |
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|
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int |
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scan_check_noscan(const struct Client *cptr) |
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{ |
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CNoScanLink *lk; |
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struct Server *sptr; |
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|
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for (lk = gConfig->noscanlist; lk; lk = lk->next) |
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{ |
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switch (lk->noscan.type) |
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{ |
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case NOSCAN_TYPE_SERVER: |
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sptr = irc_network_get_server(cptr->nserv); |
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if (!match(lk->noscan.u.server, sptr->name)) |
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return 1; /* noscan! */ |
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break; |
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|
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case NOSCAN_TYPE_USERIP: |
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{ |
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if (cptr->flags & CLIENT_FLAG_IPV6) |
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break; /* No IPv6 noscan support yet */ |
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|
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if ((cptr->addr.ip4.s_addr & lk->noscan.u.userip.netmask.s_addr) |
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== (lk->noscan.u.userip.network.s_addr |
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& lk->noscan.u.userip.netmask.s_addr)) |
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return 1; /* noscan! */ |
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break; |
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} |
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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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static void |
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scan_query(unsigned int flags, const void *addrData, uint32_t user_data) |
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{ |
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int res; |
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|
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if (!(flags & CLIENT_FLAG_IPV6)) |
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res = opas_support_query((struct in_addr *)addrData, user_data); |
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else |
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res = opas_support_query6((struct in6_addr *)addrData, user_data); |
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|
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if (res == -1) |
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{ |
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char ipbuf[32]; |
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|
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inet_ntop(flags & CLIENT_FLAG_IPV6 ? AF_INET6 : AF_INET, addrData, |
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ipbuf, sizeof(ipbuf)); |
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Debug((DL_BASIC, "scan_query: opas_support_query failed for %s\n", |
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ipbuf)); |
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} |
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} |
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|
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static void |
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scan_client_add(struct Client *cptr) |
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{ |
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assert(!(cptr->flags & CLIENT_FLAG_SCANNING)); |
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|
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/* Set scanning flag for this client. */ |
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cptr->flags |= CLIENT_FLAG_SCANNING; |
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|
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/* Link at tail */ |
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cptr->scan_next = NULL; |
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cptr->scan_prev_p = scan_client_tail_p; |
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|
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if (cptr->scan_prev_p) |
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*cptr->scan_prev_p = cptr; |
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else |
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scan_client_head = cptr; |
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scan_client_tail_p = &cptr->scan_next; |
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|
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scan_client_count++; |
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} |
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|
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void |
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scan_client_remove(struct Client *cptr) |
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{ |
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if (cptr->flags & CLIENT_FLAG_SCANFAIL) |
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unscannable_client_count--; |
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|
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if (!(cptr->flags & CLIENT_FLAG_SCANNING)) |
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return; |
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|
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if (cptr->scan_prev_p) |
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*cptr->scan_prev_p = cptr->scan_next; |
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else |
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scan_client_head = cptr->scan_next; |
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|
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if (cptr->scan_next) |
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cptr->scan_next->scan_prev_p = cptr->scan_prev_p; |
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else |
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scan_client_tail_p = cptr->scan_prev_p; |
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|
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cptr->scan_next = NULL; |
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cptr->scan_prev_p = NULL; |
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|
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scan_client_count--; |
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|
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cptr->flags &= ~CLIENT_FLAG_SCANNING; |
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} |
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|
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int |
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scan_client_get_count() |
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{ |
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return scan_client_count; |
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} |
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|
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int |
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scan_client_get_unscannable_count() |
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{ |
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return unscannable_client_count; |
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} |
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|
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/* External method scan_new_user() |
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* A new user has just connected to the network. |
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*/ |
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void |
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scan_new_user(struct Client *cptr) |
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{ |
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/* First, check the noscan list and ignore user if it matchs |
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*/ |
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if (scan_check_noscan(cptr)) |
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return; |
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|
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/* Then, check our local "level one" cache of scanned IPs. |
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*/ |
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if (scan_check_cache(cptr->flags, &cptr->addr, &cptr->scan_timestamp)) |
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{ |
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l1_cache_hits++; |
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return; |
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} |
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|
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/* Lame notice? ;) |
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*/ |
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if (gConfig->noticelist && |
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!irc_network_server_is_bursting(irc_network_get_server(cptr->nserv))) |
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{ |
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CNoticeLink *notice; |
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|
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for (notice = gConfig->noticelist; notice; notice = notice->next) |
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{ |
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char dst[6]; |
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inttobase64(dst, cptr->nserv, 2); |
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inttobase64(dst + 2, cptr->nnick, 3); |
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dst[5] = '\0'; |
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send_to_one(dst, "%s", notice->line); |
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} |
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} |
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|
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/* No luck, start scan procedure. |
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*/ |
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scan_start(cptr); |
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} |
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|
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void |
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scan_start(struct Client *cptr) |
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{ |
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cptr->scan_timestamp = peak_time(); |
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scan_client_add(cptr); |
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|
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if (opas_support_is_ready()) |
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scan_query(cptr->flags, &cptr->addr, yxx_pack_int(cptr->nserv, |
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cptr->nnick)); |
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} |
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|
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int |
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scan_send_command(struct Client *cptr, uint32_t sig, uint32_t cmd, |
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const void *data, size_t length) |
| 371 |
{ |
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PXSHeader *hp = (PXSHeader *)data; |
| 373 |
|
| 374 |
#if 0 |
| 375 |
if (cptr->flags & CLIENT_FLAG_COMMAND) |
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return 0; |
| 377 |
#endif |
| 378 |
|
| 379 |
if (!opas_support_is_ready()) |
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return -1; /* failure */ |
| 381 |
|
| 382 |
cptr->flags |= CLIENT_FLAG_COMMAND; |
| 383 |
|
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hp->sig = htonl(sig); |
| 385 |
hp->ver = htonl(PX_VERSION); |
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hp->cmd = htonl(cmd); |
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|
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opas_support_send_msg_user(hp, length, yxx_pack_int(cptr->nserv, |
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cptr->nnick)); |
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return 0; |
| 391 |
} |
| 392 |
|
| 393 |
int |
| 394 |
scan_send_simple_command(struct Client *cptr, uint32_t sig, uint32_t cmd) |
| 395 |
{ |
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PXSHeader head; |
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return scan_send_command(cptr, sig, cmd, &head, sizeof(head)); |
| 398 |
} |
| 399 |
|
| 400 |
/* Replies from opas_support module.. */ |
| 401 |
void |
| 402 |
scan_reply_noproxy(const struct in_addr *addrp, uint32_t ud, int cached) |
| 403 |
{ |
| 404 |
struct Client *cptr = irc_network_find_client(yxx_unpack(ud)); |
| 405 |
/* Verify that, if a client still exists for this numeric, he has the same |
| 406 |
* IP that we've just scanned. |
| 407 |
*/ |
| 408 |
if (cptr && cptr->addr.ip4.s_addr == addrp->s_addr |
| 409 |
&& (cptr->flags & CLIENT_FLAG_SCANNING)) |
| 410 |
{ |
| 411 |
scan_client_remove(cptr); |
| 412 |
ipcache_add_in4(ipcache4, addrp, peak_time(), NULL); |
| 413 |
Debug((DL_BASIC, "scan_reply_noproxy: scan took %d secs", |
| 414 |
peak_time() - cptr->scan_timestamp)); |
| 415 |
} |
| 416 |
} |
| 417 |
|
| 418 |
void |
| 419 |
scan_reply_proxy(const struct in_addr *addrp, uint32_t ud, int cached, |
| 420 |
int proxy_type, uint16_t proxy_port, const char *proxy_descr) |
| 421 |
{ |
| 422 |
const char *reason; |
| 423 |
struct Client *cptr = irc_network_find_client(yxx_unpack(ud)); |
| 424 |
|
| 425 |
/* Verify that, if a client still exists for this numeric, he has the same |
| 426 |
* IP that we've just scanned. |
| 427 |
*/ |
| 428 |
if (cptr && cptr->addr.ip4.s_addr == addrp->s_addr |
| 429 |
&& (cptr->flags & CLIENT_FLAG_SCANNING)) |
| 430 |
{ |
| 431 |
char ipbuf[16]; |
| 432 |
int cnt; |
| 433 |
time_t scantime; |
| 434 |
|
| 435 |
scan_client_remove(cptr); |
| 436 |
|
| 437 |
scantime = peak_time() - cptr->scan_timestamp; |
| 438 |
|
| 439 |
if (!inet_ntop(AF_INET, &cptr->addr.ip4, ipbuf, sizeof(ipbuf))) |
| 440 |
return; |
| 441 |
|
| 442 |
/* /!\ O(n) count but everyone likes it... |
| 443 |
* Used for proxytop's stats too. |
| 444 |
*/ |
| 445 |
cnt = irc_userbase_proxycount(&cptr->addr.ip4); |
| 446 |
|
| 447 |
if (cached) |
| 448 |
{ |
| 449 |
log_write(LOGID_CURRENT, "*@%s [%ld] %s (%d) cached", ipbuf, cnt, |
| 450 |
proxy_descr, proxy_port); |
| 451 |
|
| 452 |
if (gConfig->client.show_cached) |
| 453 |
send_msg_client_to_console("PG *@%s [%ld] %s at port %u (cached)", |
| 454 |
ipbuf, cnt, proxy_descr, proxy_port); |
| 455 |
|
| 456 |
evreg_broadcast(EVREG_FLAG_CACHED, |
| 457 |
"[EV] PG *@%s [%ld] %s at port %u (cached)", |
| 458 |
ipbuf, cnt, proxy_descr, proxy_port); |
| 459 |
} |
| 460 |
else |
| 461 |
{ |
| 462 |
/* Logging */ |
| 463 |
log_write(LOGID_CURRENT, "*@%s [%ld] %s (%d)", ipbuf, cnt, |
| 464 |
proxy_descr, proxy_port); |
| 465 |
|
| 466 |
/* Console channel */ |
| 467 |
send_msg_client_to_console("PG *@%s [%ld] %s at port %u (%ds)", ipbuf, |
| 468 |
cnt, proxy_descr, proxy_port, scantime); |
| 469 |
|
| 470 |
/* Private event notification */ |
| 471 |
evreg_broadcast(EVREG_FLAG_NEWPROXY, |
| 472 |
"[EV] PG *@%s [%ld] %s at port %u (%ds)", |
| 473 |
ipbuf, cnt, proxy_descr, proxy_port, scantime); |
| 474 |
} |
| 475 |
|
| 476 |
if (proxy_type >= 0 && proxy_type < 8) |
| 477 |
reason = gConfig->gline.reason[proxy_type]; |
| 478 |
else |
| 479 |
reason = gConfig->gline.reason[0]; |
| 480 |
|
| 481 |
irc_gline_send(addrp, cnt, reason); |
| 482 |
} |
| 483 |
} |
| 484 |
|
| 485 |
void |
| 486 |
scan_reply_error(const struct in_addr *addrp, uint32_t ud, uint32_t error) |
| 487 |
{ |
| 488 |
/* Ok, can't scan this IP.. no luck ! */ |
| 489 |
struct Client *cptr = irc_network_find_client(yxx_unpack(ud)); |
| 490 |
|
| 491 |
if (cptr && cptr->addr.ip4.s_addr == addrp->s_addr |
| 492 |
&& (cptr->flags & CLIENT_FLAG_SCANNING) && error != 1000) |
| 493 |
{ |
| 494 |
char ipbuf[16]; |
| 495 |
|
| 496 |
scan_client_remove(cptr); |
| 497 |
cptr->flags |= CLIENT_FLAG_SCANFAIL; |
| 498 |
unscannable_client_count++; |
| 499 |
|
| 500 |
/* Log it. */ |
| 501 |
if (!inet_ntop(AF_INET, &cptr->addr.ip4, ipbuf, sizeof(ipbuf))) |
| 502 |
return; |
| 503 |
|
| 504 |
log_write(LOGID_UNREACH, "%ld,%s", peak_time(), ipbuf); |
| 505 |
} |
| 506 |
} |
| 507 |
|
| 508 |
void |
| 509 |
scan_reply6_noproxy(const struct in6_addr *addrp, uint32_t ud, int cached) |
| 510 |
{ |
| 511 |
/* Unused for now (who could we blame ?? :) */ |
| 512 |
} |
| 513 |
|
| 514 |
void |
| 515 |
scan_reply6_proxy(const struct in6_addr *addrp, uint32_t ud, int cached, |
| 516 |
int proxy_type, uint16_t proxy_port, const char *proxy_descr) |
| 517 |
{ |
| 518 |
/* Unused for now */ |
| 519 |
} |
| 520 |
|
| 521 |
void |
| 522 |
scan_reply6_error(const struct in6_addr *addrp, uint32_t ud, uint32_t error) |
| 523 |
{ |
| 524 |
/* Unused for now */ |
| 525 |
} |
| 526 |
|
| 527 |
void |
| 528 |
scan_reply_command(void *data, size_t length, uint32_t ud) |
| 529 |
{ |
| 530 |
struct Client *cptr = irc_network_find_client(yxx_unpack(ud)); |
| 531 |
|
| 532 |
if (cptr && (cptr->flags & CLIENT_FLAG_COMMAND) |
| 533 |
&& (length > sizeof(PXSHeader))) |
| 534 |
{ |
| 535 |
PXSHeader *head = (PXSHeader *)data; |
| 536 |
|
| 537 |
head->sig = ntohl(head->sig); |
| 538 |
head->ver = ntohl(head->ver); |
| 539 |
head->cmd = ntohl(head->cmd); |
| 540 |
|
| 541 |
cptr->flags &= ~CLIENT_FLAG_COMMAND; |
| 542 |
|
| 543 |
if (head->sig != PXYSCAND_SIG || head->ver != PX_VERSION) |
| 544 |
return; |
| 545 |
|
| 546 |
/* Reply looks fine */ |
| 547 |
switch (head->cmd) |
| 548 |
{ |
| 549 |
case PX_CMD_STATUS: |
| 550 |
cmd_status_reply(cptr, (PXSStatus *)data, length); |
| 551 |
break; |
| 552 |
case PX_CMD_STATS: |
| 553 |
cmd_pxstats_reply(cptr, (PXSStats *)data); |
| 554 |
break; |
| 555 |
case PX_CMD_REMOVE: |
| 556 |
if (cptr->flags & CLIENT_FLAG_GREM) |
| 557 |
cmd_grem_reply(cptr, (PXSRemove4 *)data); |
| 558 |
else |
| 559 |
cmd_recheck_reply(cptr, (PXSRemove4 *)data); |
| 560 |
break; |
| 561 |
default: |
| 562 |
break; |
| 563 |
} |
| 564 |
} |
| 565 |
} |
