374 lines
9.4 KiB
C
374 lines
9.4 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*
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*/
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#include "stdinc.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 "ircd.h"
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#include "send.h"
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#include "numeric.h"
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#include "parse.h"
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#include "hostmask.h"
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#include "match.h"
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#include "hash.h"
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static rb_patricia_tree_t *reject_tree;
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static rb_dlink_list delay_exit;
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static rb_dlink_list reject_list;
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static rb_dlink_list throttle_list;
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static rb_patricia_tree_t *throttle_tree;
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static void throttle_expires(void *unused);
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typedef struct _reject_data {
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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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} reject_t;
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typedef struct _delay_data {
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rb_dlink_node node;
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rb_fde_t *F;
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} delay_t;
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typedef struct _throttle {
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rb_dlink_node node;
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time_t last;
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int count;
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} throttle_t;
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unsigned long
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delay_exit_length(void)
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{
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return rb_dlink_list_length(&delay_exit);
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}
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static void
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reject_exit(void *unused)
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{
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rb_dlink_node *ptr, *ptr_next;
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delay_t *ddata;
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static const char *errbuf = "ERROR :Closing Link: (*** Banned (cache))\r\n";
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RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head) {
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ddata = ptr->data;
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rb_write(ddata->F, errbuf, strlen(errbuf));
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rb_close(ddata->F);
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rb_free(ddata);
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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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reject_t *rdata;
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RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) {
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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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throttle_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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rb_event_add("throttle_expires", throttle_expires, NULL, 10);
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}
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unsigned long
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throttle_size(void)
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{
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unsigned long count;
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rb_dlink_node *ptr;
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rb_patricia_node_t *pnode;
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throttle_t *t;
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count = 0;
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RB_DLINK_FOREACH(ptr, throttle_list.head) {
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pnode = ptr->data;
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t = pnode->data;
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if (t->count > ConfigFileEntry.throttle_count)
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count++;
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}
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return count;
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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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reject_t *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_duration == 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((const unsigned char *)mask1, 32);
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if (mask2 != NULL)
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hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32);
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if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL) {
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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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} else {
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int bitlen = 32;
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#ifdef RB_IPV6
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if(GET_SS_FAMILY(&client_p->localClient->ip) == 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(reject_t));
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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(rb_fde_t *F, struct sockaddr *addr)
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{
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rb_patricia_node_t *pnode;
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reject_t *rdata;
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delay_t *ddata;
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/* Reject is disabled */
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if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
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return 0;
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pnode = rb_match_ip(reject_tree, addr);
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if(pnode != NULL) {
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rdata = pnode->data;
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rdata->time = rb_current_time();
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if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count) {
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ddata = rb_malloc(sizeof(delay_t));
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ServerStats.is_rej++;
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rb_setselect(F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
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ddata->F = F;
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rb_dlinkAdd(ddata, &ddata->node, &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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int
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is_reject_ip(struct sockaddr *addr)
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{
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rb_patricia_node_t *pnode;
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reject_t *rdata;
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int duration;
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/* Reject is disabled */
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if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
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return 0;
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pnode = rb_match_ip(reject_tree, addr);
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if(pnode != NULL) {
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rdata = pnode->data;
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if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count) {
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duration = rdata->time + ConfigFileEntry.reject_duration - rb_current_time();
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return duration > 0 ? duration : 1;
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}
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}
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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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reject_t *rdata;
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RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) {
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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_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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reject_t *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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reject_t *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((const unsigned char *)mask1, 32);
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if (mask2 != NULL)
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hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32);
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RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) {
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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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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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throttle_add(struct sockaddr *addr)
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{
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throttle_t *t;
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rb_patricia_node_t *pnode;
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if((pnode = rb_match_ip(throttle_tree, addr)) != NULL) {
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t = pnode->data;
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if(t->count > ConfigFileEntry.throttle_count) {
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ServerStats.is_thr++;
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return 1;
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}
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/* Stop penalizing them after they've been throttled */
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t->last = rb_current_time();
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t->count++;
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} else {
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int bitlen = 32;
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#ifdef RB_IPV6
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if(GET_SS_FAMILY(addr) == AF_INET6)
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bitlen = 128;
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#endif
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t = rb_malloc(sizeof(throttle_t));
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t->last = rb_current_time();
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t->count = 1;
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pnode = make_and_lookup_ip(throttle_tree, addr, bitlen);
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pnode->data = t;
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rb_dlinkAdd(pnode, &t->node, &throttle_list);
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}
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return 0;
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}
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int
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is_throttle_ip(struct sockaddr *addr)
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{
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throttle_t *t;
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rb_patricia_node_t *pnode;
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int duration;
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if((pnode = rb_match_ip(throttle_tree, addr)) != NULL) {
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t = pnode->data;
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if(t->count > ConfigFileEntry.throttle_count) {
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duration = t->last + ConfigFileEntry.throttle_duration - rb_current_time();
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return duration > 0 ? duration : 1;
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}
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}
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return 0;
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}
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void
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flush_throttle(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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throttle_t *t;
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RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head) {
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pnode = ptr->data;
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t = pnode->data;
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rb_dlinkDelete(ptr, &throttle_list);
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rb_free(t);
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rb_patricia_remove(throttle_tree, pnode);
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}
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}
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static void
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throttle_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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throttle_t *t;
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RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head) {
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pnode = ptr->data;
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t = pnode->data;
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if(t->last + ConfigFileEntry.throttle_duration > rb_current_time())
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continue;
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rb_dlinkDelete(ptr, &throttle_list);
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rb_free(t);
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rb_patricia_remove(throttle_tree, pnode);
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}
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}
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