elemental-ircd/src/reject.c

301 lines
7.4 KiB
C

/*
* ircd-ratbox: A slightly useful ircd
* reject.c: reject users with prejudice
*
* Copyright (C) 2003 Aaron Sethman <androsyn@ratbox.org>
* Copyright (C) 2003-2005 ircd-ratbox development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id: reject.c 3456 2007-05-18 19:14:18Z jilles $
*/
#include "stdinc.h"
#include "config.h"
#include "client.h"
#include "s_conf.h"
#include "reject.h"
#include "s_stats.h"
#include "msg.h"
#include "hash.h"
static rb_patricia_tree_t *reject_tree;
rb_dlink_list delay_exit;
static rb_dlink_list reject_list;
static rb_patricia_tree_t *unknown_tree;
struct reject_data
{
rb_dlink_node rnode;
time_t time;
unsigned int count;
uint32_t mask_hashv;
};
static void
reject_exit(void *unused)
{
struct Client *client_p;
rb_dlink_node *ptr, *ptr_next;
RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head)
{
client_p = ptr->data;
if(IsDead(client_p))
continue;
/* this MUST be here, to prevent the possibility
* sendto_one() generates a write error, and then a client
* ends up on the dead_list and the abort_list --fl
*
* new disconnect notice stolen from ircu --nenolod
* no, this only happens when someone's IP has some
* ban on it and rejects them rather longer than the
* ircu message suggests --jilles
*/
if(!IsIOError(client_p))
{
if(IsExUnknown(client_p))
sendto_one(client_p, "ERROR :Closing Link: %s (*** Too many unknown connections)", client_p->host);
else
sendto_one(client_p, "ERROR :Closing Link: %s (*** Banned (cache))", client_p->host);
}
close_connection(client_p);
SetDead(client_p);
rb_dlinkAddAlloc(client_p, &dead_list);
}
delay_exit.head = delay_exit.tail = NULL;
delay_exit.length = 0;
}
static void
reject_expires(void *unused)
{
rb_dlink_node *ptr, *next;
rb_patricia_node_t *pnode;
struct reject_data *rdata;
RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
{
pnode = ptr->data;
rdata = pnode->data;
if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time())
continue;
rb_dlinkDelete(ptr, &reject_list);
rb_free(rdata);
rb_patricia_remove(reject_tree, pnode);
}
}
void
init_reject(void)
{
reject_tree = rb_new_patricia(PATRICIA_BITS);
unknown_tree = rb_new_patricia(PATRICIA_BITS);
rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME);
rb_event_add("reject_expires", reject_expires, NULL, 60);
}
void
add_reject(struct Client *client_p, const char *mask1, const char *mask2)
{
rb_patricia_node_t *pnode;
struct reject_data *rdata;
uint32_t hashv;
/* Reject is disabled */
if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0)
return;
hashv = 0;
if (mask1 != NULL)
hashv ^= fnv_hash_upper(mask1, 32);
if (mask2 != NULL)
hashv ^= fnv_hash_upper(mask2, 32);
if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
{
rdata = pnode->data;
rdata->time = rb_current_time();
rdata->count++;
}
else
{
int bitlen = 32;
#ifdef RB_IPV6
if(client_p->localClient->ip.ss_family == AF_INET6)
bitlen = 128;
#endif
pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
pnode->data = rdata = rb_malloc(sizeof(struct reject_data));
rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list);
rdata->time = rb_current_time();
rdata->count = 1;
}
rdata->mask_hashv = hashv;
}
int
check_reject(struct Client *client_p)
{
rb_patricia_node_t *pnode;
struct reject_data *rdata;
/* Reject is disabled */
if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
ConfigFileEntry.reject_duration == 0)
return 0;
pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip);
if(pnode != NULL)
{
rdata = pnode->data;
rdata->time = rb_current_time();
if(rdata->count > ConfigFileEntry.reject_after_count)
{
ServerStats.is_rej++;
SetReject(client_p);
rb_setselect(client_p->localClient->F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
SetClosing(client_p);
rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
return 1;
}
}
/* Caller does what it wants */
return 0;
}
void
flush_reject(void)
{
rb_dlink_node *ptr, *next;
rb_patricia_node_t *pnode;
struct reject_data *rdata;
RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
{
pnode = ptr->data;
rdata = pnode->data;
rb_dlinkDelete(ptr, &reject_list);
rb_free(rdata);
rb_patricia_remove(reject_tree, pnode);
}
}
int
remove_reject_ip(const char *ip)
{
rb_patricia_node_t *pnode;
/* Reject is disabled */
if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 ||
ConfigFileEntry.reject_duration == 0)
return -1;
if((pnode = rb_match_string(reject_tree, ip)) != NULL)
{
struct reject_data *rdata = pnode->data;
rb_dlinkDelete(&rdata->rnode, &reject_list);
rb_free(rdata);
rb_patricia_remove(reject_tree, pnode);
return 1;
}
return 0;
}
int
remove_reject_mask(const char *mask1, const char *mask2)
{
rb_dlink_node *ptr, *next;
rb_patricia_node_t *pnode;
struct reject_data *rdata;
uint32_t hashv;
int n = 0;
hashv = 0;
if (mask1 != NULL)
hashv ^= fnv_hash_upper(mask1, 32);
if (mask2 != NULL)
hashv ^= fnv_hash_upper(mask2, 32);
RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
{
pnode = ptr->data;
rdata = pnode->data;
if (rdata->mask_hashv == hashv)
{
rb_dlinkDelete(ptr, &reject_list);
rb_free(rdata);
rb_patricia_remove(reject_tree, pnode);
n++;
}
}
return n;
}
int
add_unknown_ip(struct Client *client_p)
{
rb_patricia_node_t *pnode;
if((pnode = rb_match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) == NULL)
{
int bitlen = 32;
#ifdef RB_IPV6
if(client_p->localClient->ip.ss_family == AF_INET6)
bitlen = 128;
#endif
pnode = make_and_lookup_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
pnode->data = (void *)0;
}
if((unsigned long)pnode->data >= ConfigFileEntry.max_unknown_ip)
{
SetExUnknown(client_p);
SetReject(client_p);
rb_setselect(client_p->localClient->F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
SetClosing(client_p);
rb_dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit);
return 1;
}
pnode->data = (void *)((unsigned long)pnode->data + 1);
return 0;
}
void
del_unknown_ip(struct Client *client_p)
{
rb_patricia_node_t *pnode;
if((pnode = rb_match_ip(unknown_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL)
{
pnode->data = (void *)((unsigned long)pnode->data - 1);
if((unsigned long)pnode->data <= 0)
{
rb_patricia_remove(unknown_tree, pnode);
}
}
/* this can happen due to m_webirc.c's manipulations, for example */
}