303 lines
7.4 KiB
C
303 lines
7.4 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd
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* reject.c: reject users with prejudice
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*
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* Copyright (C) 2003 Aaron Sethman <androsyn@ratbox.org>
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* Copyright (C) 2003-2005 ircd-ratbox 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: reject.c 3456 2007-05-18 19:14:18Z jilles $
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*/
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#include "stdinc.h"
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#include "config.h"
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#include "client.h"
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#include "s_conf.h"
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#include "reject.h"
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#include "s_stats.h"
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#include "msg.h"
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#include "hash.h"
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static rb_patricia_tree_t *reject_tree;
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rb_dlink_list delay_exit;
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static rb_dlink_list reject_list;
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static rb_patricia_tree_t *unknown_tree;
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struct reject_data
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{
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rb_dlink_node rnode;
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time_t time;
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unsigned int count;
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uint32_t mask_hashv;
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};
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static rb_patricia_tree_t *unknown_tree;
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static void
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reject_exit(void *unused)
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{
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struct Client *client_p;
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rb_dlink_node *ptr, *ptr_next;
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RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head)
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{
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client_p = ptr->data;
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if(IsDead(client_p))
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continue;
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/* this MUST be here, to prevent the possibility
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* sendto_one() generates a write error, and then a client
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* ends up on the dead_list and the abort_list --fl
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*
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* new disconnect notice stolen from ircu --nenolod
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* no, this only happens when someone's IP has some
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* ban on it and rejects them rather longer than the
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* ircu message suggests --jilles
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*/
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if(!IsIOError(client_p))
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{
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if(IsExUnknown(client_p))
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sendto_one(client_p, "ERROR :Closing Link: %s (*** Too many unknown connections)", client_p->host);
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else
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sendto_one(client_p, "ERROR :Closing Link: %s (*** Banned (cache))", client_p->host);
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}
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close_connection(client_p);
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SetDead(client_p);
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rb_dlinkAddAlloc(client_p, &dead_list);
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}
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delay_exit.head = delay_exit.tail = NULL;
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delay_exit.length = 0;
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}
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static void
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reject_expires(void *unused)
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{
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rb_dlink_node *ptr, *next;
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rb_patricia_node_t *pnode;
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struct reject_data *rdata;
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RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
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{
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pnode = ptr->data;
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rdata = pnode->data;
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if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time())
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continue;
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rb_dlinkDelete(ptr, &reject_list);
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rb_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
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}
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}
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void
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init_reject(void)
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{
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reject_tree = rb_new_patricia(PATRICIA_BITS);
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unknown_tree = rb_new_patricia(PATRICIA_BITS);
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rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME);
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rb_event_add("reject_expires", reject_expires, NULL, 60);
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}
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void
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add_reject(struct Client *client_p, const char *mask1, const char *mask2)
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{
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rb_patricia_node_t *pnode;
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struct reject_data *rdata;
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uint32_t hashv;
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/* Reject is disabled */
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if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0)
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return;
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hashv = 0;
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if (mask1 != NULL)
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hashv ^= fnv_hash_upper(mask1, 32);
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if (mask2 != NULL)
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hashv ^= fnv_hash_upper(mask2, 32);
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if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
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{
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rdata = pnode->data;
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rdata->time = rb_current_time();
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rdata->count++;
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}
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else
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{
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int bitlen = 32;
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#ifdef IPV6
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if(client_p->localClient->ip.ss_family == AF_INET6)
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bitlen = 128;
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#endif
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pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
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pnode->data = rdata = rb_malloc(sizeof(struct reject_data));
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rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list);
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rdata->time = rb_current_time();
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rdata->count = 1;
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}
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rdata->mask_hashv = hashv;
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}
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int
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check_reject(struct Client *client_p)
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{
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rb_patricia_node_t *pnode;
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struct reject_data *rdata;
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/* Reject is disabled */
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if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
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ConfigFileEntry.reject_duration == 0)
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return 0;
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pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip);
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if(pnode != NULL)
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{
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rdata = pnode->data;
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rdata->time = rb_current_time();
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if(rdata->count > ConfigFileEntry.reject_after_count)
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{
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ServerStats->is_rej++;
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SetReject(client_p);
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rb_setselect(client_p->localClient->F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
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SetClosing(client_p);
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rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
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return 1;
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}
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}
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/* Caller does what it wants */
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return 0;
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}
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void
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flush_reject(void)
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{
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rb_dlink_node *ptr, *next;
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rb_patricia_node_t *pnode;
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struct reject_data *rdata;
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RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
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{
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pnode = ptr->data;
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rdata = pnode->data;
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rb_dlinkDelete(ptr, &reject_list);
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rb_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
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}
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}
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int
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remove_reject_ip(const char *ip)
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{
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rb_patricia_node_t *pnode;
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/* Reject is disabled */
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if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
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ConfigFileEntry.reject_duration == 0)
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return -1;
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if((pnode = rb_match_string(reject_tree, ip)) != NULL)
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{
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struct reject_data *rdata = pnode->data;
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rb_dlinkDelete(&rdata->rnode, &reject_list);
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rb_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
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return 1;
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}
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return 0;
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}
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int
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remove_reject_mask(const char *mask1, const char *mask2)
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{
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rb_dlink_node *ptr, *next;
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rb_patricia_node_t *pnode;
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struct reject_data *rdata;
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uint32_t hashv;
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int n = 0;
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hashv = 0;
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if (mask1 != NULL)
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hashv ^= fnv_hash_upper(mask1, 32);
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if (mask2 != NULL)
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hashv ^= fnv_hash_upper(mask2, 32);
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RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
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{
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pnode = ptr->data;
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rdata = pnode->data;
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if (rdata->mask_hashv == hashv)
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{
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rb_dlinkDelete(ptr, &reject_list);
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rb_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
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n++;
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}
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}
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return n;
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}
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int
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add_unknown_ip(struct Client *client_p)
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{
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rb_patricia_node_t *pnode;
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if((pnode = rb_match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) == NULL)
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{
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int bitlen = 32;
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#ifdef IPV6
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if(client_p->localClient->ip.ss_family == AF_INET6)
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bitlen = 128;
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#endif
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pnode = make_and_lookup_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
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pnode->data = (void *)0;
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}
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if((unsigned long)pnode->data >= ConfigFileEntry.max_unknown_ip)
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{
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SetExUnknown(client_p);
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SetReject(client_p);
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rb_setselect(client_p->localClient->F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
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SetClosing(client_p);
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rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
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return 1;
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}
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pnode->data = (void *)((unsigned long)pnode->data + 1);
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return 0;
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}
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void
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del_unknown_ip(struct Client *client_p)
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{
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rb_patricia_node_t *pnode;
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if((pnode = rb_match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
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{
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pnode->data = (void *)((unsigned long)pnode->data - 1);
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if((unsigned long)pnode->data <= 0)
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{
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rb_patricia_remove(unknown_tree, pnode);
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}
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}
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/* this can happen due to m_webirc.c's manipulations, for example */
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}
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