solanum/ircd/reject.c

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/*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include "stdinc.h"
#include "client.h"
#include "s_conf.h"
#include "reject.h"
#include "s_stats.h"
#include "ircd.h"
#include "send.h"
#include "numeric.h"
#include "parse.h"
#include "hostmask.h"
#include "match.h"
#include "hash.h"
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static rb_patricia_tree_t *reject_tree;
static rb_dlink_list delay_exit;
static rb_dlink_list reject_list;
static rb_dlink_list throttle_list;
static rb_patricia_tree_t *throttle_tree;
static void throttle_expires(void *unused);
typedef struct _reject_data
{
rb_dlink_node rnode;
struct ConfItem *aconf;
const char *reason;
time_t time;
unsigned int count;
uint32_t mask_hashv;
} reject_t;
typedef struct _delay_data
{
rb_dlink_node node;
rb_fde_t *F;
struct ConfItem *aconf;
const char *reason;
} delay_t;
typedef struct _throttle
{
rb_dlink_node node;
time_t last;
int count;
} throttle_t;
unsigned long
delay_exit_length(void)
{
return rb_dlink_list_length(&delay_exit);
}
static void
reject_free(reject_t *rdata)
{
struct ConfItem *aconf = rdata->aconf;
if (aconf)
deref_conf(aconf);
rb_free(rdata);
}
static void
reject_exit(void *unused)
{
static char dynamic_reason[BUFSIZE];
rb_dlink_node *ptr, *ptr_next;
delay_t *ddata;
static const char *errbuf = "ERROR :Closing Link: (*** Banned (cache))\r\n";
RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head)
{
ddata = ptr->data;
*dynamic_reason = '\0';
if (ddata->aconf)
{
snprintf(dynamic_reason, sizeof dynamic_reason, form_str(ERR_YOUREBANNEDCREEP) "\r\n",
me.name, "*", get_user_ban_reason(ddata->aconf));
rb_write(ddata->F, dynamic_reason, strlen(dynamic_reason));
deref_conf(ddata->aconf);
}
else if (ddata->reason)
{
snprintf(dynamic_reason, sizeof dynamic_reason, ":%s 465 %s :%s\r\n",
me.name, "*", ddata->reason);
rb_write(ddata->F, dynamic_reason, strlen(dynamic_reason));
}
rb_write(ddata->F, errbuf, strlen(errbuf));
rb_close(ddata->F);
rb_free(ddata);
}
delay_exit.head = delay_exit.tail = NULL;
delay_exit.length = 0;
}
static void
reject_expires(void *unused)
{
rb_dlink_node *ptr, *next;
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rb_patricia_node_t *pnode;
reject_t *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);
reject_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
}
}
void
init_reject(void)
{
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reject_tree = rb_new_patricia(PATRICIA_BITS);
throttle_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);
rb_event_add("throttle_expires", throttle_expires, NULL, 10);
}
unsigned long
throttle_size(void)
{
unsigned long count;
rb_dlink_node *ptr;
rb_patricia_node_t *pnode;
throttle_t *t;
count = 0;
RB_DLINK_FOREACH(ptr, throttle_list.head)
{
pnode = ptr->data;
t = pnode->data;
if (t->count > ConfigFileEntry.throttle_count)
count++;
}
return count;
}
void
add_reject(struct Client *client_p, const char *mask1, const char *mask2, struct ConfItem *aconf, const char *reason)
{
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rb_patricia_node_t *pnode;
reject_t *rdata;
uint32_t hashv;
/* Reject is disabled */
if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
return;
hashv = 0;
if (mask1 != NULL)
hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32);
if (mask2 != NULL)
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)
{
rdata = pnode->data;
rdata->time = rb_current_time();
rdata->count++;
}
else
{
int bitlen = 32;
if(GET_SS_FAMILY(&client_p->localClient->ip) == AF_INET6)
bitlen = 128;
pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen);
pnode->data = rdata = rb_malloc(sizeof(reject_t));
rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list);
rdata->time = rb_current_time();
rdata->count = 1;
rdata->aconf = NULL;
rdata->reason = NULL;
}
rdata->mask_hashv = hashv;
if (aconf != NULL && aconf != rdata->aconf && (aconf->status & CONF_KILL) && aconf->passwd)
{
if (rdata->aconf != NULL)
deref_conf(rdata->aconf);
aconf->clients++;
rdata->aconf = aconf;
}
else if (reason != NULL)
{
if (rdata->aconf != NULL)
deref_conf(rdata->aconf);
rdata->aconf = NULL;
rdata->reason = reason;
}
}
int
check_reject(rb_fde_t *F, struct sockaddr *addr)
{
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rb_patricia_node_t *pnode;
reject_t *rdata;
delay_t *ddata;
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/* Reject is disabled */
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if (ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
return 0;
pnode = rb_match_ip(reject_tree, addr);
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if (pnode == NULL)
return 0;
rdata = pnode->data;
rdata->time = rb_current_time();
if (rdata->count <= (unsigned long)ConfigFileEntry.reject_after_count)
return 0;
if (rdata->aconf != NULL && rdata->aconf->status & CONF_ILLEGAL)
{
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rb_dlinkDelete(&rdata->rnode, &reject_list);
reject_free(rdata);
rb_patricia_remove(reject_tree, pnode);
return 0;
}
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ddata = rb_malloc(sizeof(delay_t));
ServerStats.is_rej++;
rb_setselect(F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL);
if (rdata->aconf)
{
ddata->aconf = rdata->aconf;
ddata->aconf->clients++;
ddata->reason = NULL;
}
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else if (rdata->reason)
{
ddata->reason = rdata->reason;
ddata->aconf = NULL;
}
else
{
ddata->aconf = NULL;
ddata->reason = NULL;
}
ddata->F = F;
rb_dlinkAdd(ddata, &ddata->node, &delay_exit);
return 1;
}
int
is_reject_ip(struct sockaddr *addr)
{
rb_patricia_node_t *pnode;
reject_t *rdata;
int duration;
/* Reject is disabled */
if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
return 0;
pnode = rb_match_ip(reject_tree, addr);
if(pnode != NULL)
{
rdata = pnode->data;
if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count)
{
duration = rdata->time + ConfigFileEntry.reject_duration - rb_current_time();
return duration > 0 ? duration : 1;
}
}
return 0;
}
void
flush_reject(void)
{
rb_dlink_node *ptr, *next;
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rb_patricia_node_t *pnode;
reject_t *rdata;
RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head)
{
pnode = ptr->data;
rdata = pnode->data;
rb_dlinkDelete(ptr, &reject_list);
reject_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
}
}
int
remove_reject_ip(const char *ip)
{
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rb_patricia_node_t *pnode;
/* Reject is disabled */
if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0)
return -1;
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if((pnode = rb_match_string(reject_tree, ip)) != NULL)
{
reject_t *rdata = pnode->data;
rb_dlinkDelete(&rdata->rnode, &reject_list);
reject_free(rdata);
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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;
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rb_patricia_node_t *pnode;
reject_t *rdata;
uint32_t hashv;
int n = 0;
hashv = 0;
if (mask1 != NULL)
hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32);
if (mask2 != NULL)
hashv ^= fnv_hash_upper((const unsigned char *)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);
reject_free(rdata);
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rb_patricia_remove(reject_tree, pnode);
n++;
}
}
return n;
}
int
throttle_add(struct sockaddr *addr)
{
throttle_t *t;
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rb_patricia_node_t *pnode;
if((pnode = rb_match_ip(throttle_tree, addr)) != NULL)
{
t = pnode->data;
if(t->count > ConfigFileEntry.throttle_count)
{
ServerStats.is_thr++;
return 1;
}
/* Stop penalizing them after they've been throttled */
t->last = rb_current_time();
t->count++;
} else {
int bitlen = 32;
if(GET_SS_FAMILY(addr) == AF_INET6)
bitlen = 128;
t = rb_malloc(sizeof(throttle_t));
t->last = rb_current_time();
t->count = 1;
pnode = make_and_lookup_ip(throttle_tree, addr, bitlen);
pnode->data = t;
rb_dlinkAdd(pnode, &t->node, &throttle_list);
}
return 0;
}
int
is_throttle_ip(struct sockaddr *addr)
{
throttle_t *t;
rb_patricia_node_t *pnode;
int duration;
if((pnode = rb_match_ip(throttle_tree, addr)) != NULL)
{
t = pnode->data;
if(t->count > ConfigFileEntry.throttle_count)
{
duration = t->last + ConfigFileEntry.throttle_duration - rb_current_time();
return duration > 0 ? duration : 1;
}
}
return 0;
}
void
flush_throttle(void)
{
rb_dlink_node *ptr, *next;
rb_patricia_node_t *pnode;
throttle_t *t;
RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head)
{
pnode = ptr->data;
t = pnode->data;
rb_dlinkDelete(ptr, &throttle_list);
rb_free(t);
rb_patricia_remove(throttle_tree, pnode);
}
}
static void
throttle_expires(void *unused)
{
rb_dlink_node *ptr, *next;
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rb_patricia_node_t *pnode;
throttle_t *t;
RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head)
{
pnode = ptr->data;
t = pnode->data;
if(t->last + ConfigFileEntry.throttle_duration > rb_current_time())
continue;
rb_dlinkDelete(ptr, &throttle_list);
rb_free(t);
rb_patricia_remove(throttle_tree, pnode);
}
}