2 * charybdis: A slightly useful ircd.
3 * blacklist.c: Manages DNS blacklist entries and lookups
5 * Copyright (C) 2006-2008 charybdis development team
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
11 * 1. Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
33 * $Id: blacklist.c 2743 2006-11-10 15:15:00Z jilles $
45 #include "blacklist.h"
47 dlink_list blacklist_list
= { NULL
, NULL
, 0 };
49 /* private interfaces */
50 static struct Blacklist
*find_blacklist(char *name
)
54 DLINK_FOREACH(nptr
, blacklist_list
.head
)
56 struct Blacklist
*blptr
= (struct Blacklist
*) nptr
->data
;
58 if (!irccmp(blptr
->host
, name
))
65 static void blacklist_dns_callback(void *vptr
, struct DNSReply
*reply
)
67 struct BlacklistClient
*blcptr
= (struct BlacklistClient
*) vptr
;
70 if (blcptr
== NULL
|| blcptr
->client_p
== NULL
)
73 if (blcptr
->client_p
->preClient
== NULL
)
75 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
76 "blacklist_dns_callback(): blcptr->client_p->preClient (%s) is NULL", get_client_name(blcptr
->client_p
, HIDE_IP
));
83 /* only accept 127.0.0.x as a listing */
84 listed
= reply
->addr
.ss_family
== AF_INET
&&
85 !memcmp(&((struct sockaddr_in
*)&reply
->addr
)->sin_addr
, "\177\0\0", 3);
88 /* they have a blacklist entry for this client */
89 if (listed
&& blcptr
->client_p
->preClient
->dnsbl_listed
== NULL
)
91 blcptr
->client_p
->preClient
->dnsbl_listed
= blcptr
->blacklist
;
92 /* reference to blacklist moves from blcptr to client_p->preClient... */
95 unref_blacklist(blcptr
->blacklist
);
97 dlinkDelete(&blcptr
->node
, &blcptr
->client_p
->preClient
->dnsbl_queries
);
99 /* yes, it can probably happen... */
100 if (dlink_list_length(&blcptr
->client_p
->preClient
->dnsbl_queries
) == 0 && blcptr
->client_p
->flags
& FLAGS_SENTUSER
&& !EmptyString(blcptr
->client_p
->name
))
102 char buf
[USERLEN
+ 1];
103 strlcpy(buf
, blcptr
->client_p
->username
, sizeof buf
);
104 register_local_user(blcptr
->client_p
, blcptr
->client_p
, buf
);
110 /* XXX: no IPv6 implementation, not to concerned right now though. */
111 static void initiate_blacklist_dnsquery(struct Blacklist
*blptr
, struct Client
*client_p
)
113 struct BlacklistClient
*blcptr
= MyMalloc(sizeof(struct BlacklistClient
));
114 char buf
[IRCD_BUFSIZE
];
117 blcptr
->blacklist
= blptr
;
118 blcptr
->client_p
= client_p
;
120 blcptr
->dns_query
.ptr
= blcptr
;
121 blcptr
->dns_query
.callback
= blacklist_dns_callback
;
123 /* XXX: yes I know this is bad, I don't really care right now */
124 sscanf(client_p
->sockhost
, "%d.%d.%d.%d", &ip
[3], &ip
[2], &ip
[1], &ip
[0]);
126 /* becomes 2.0.0.127.torbl.ahbl.org or whatever */
127 ircsnprintf(buf
, IRCD_BUFSIZE
, "%d.%d.%d.%d.%s", ip
[0], ip
[1], ip
[2], ip
[3], blptr
->host
);
129 gethost_byname_type(buf
, &blcptr
->dns_query
, T_A
);
131 dlinkAdd(blcptr
, &blcptr
->node
, &client_p
->preClient
->dnsbl_queries
);
135 /* public interfaces */
136 struct Blacklist
*new_blacklist(char *name
, char *reject_reason
)
138 struct Blacklist
*blptr
;
140 if (name
== NULL
|| reject_reason
== NULL
)
143 blptr
= find_blacklist(name
);
146 blptr
= MyMalloc(sizeof(struct Blacklist
));
147 dlinkAddAlloc(blptr
, &blacklist_list
);
150 blptr
->status
&= ~CONF_ILLEGAL
;
151 strlcpy(blptr
->host
, name
, HOSTLEN
);
152 strlcpy(blptr
->reject_reason
, reject_reason
, IRCD_BUFSIZE
);
157 void unref_blacklist(struct Blacklist
*blptr
)
160 if (blptr
->status
& CONF_ILLEGAL
&& blptr
->refcount
<= 0)
162 dlinkFindDestroy(blptr
, &blacklist_list
);
167 void lookup_blacklists(struct Client
*client_p
)
171 /* We don't do IPv6 right now, sorry! */
172 if (client_p
->localClient
->ip
.ss_family
== AF_INET6
)
175 DLINK_FOREACH(nptr
, blacklist_list
.head
)
177 struct Blacklist
*blptr
= (struct Blacklist
*) nptr
->data
;
179 if (!(blptr
->status
& CONF_ILLEGAL
))
180 initiate_blacklist_dnsquery(blptr
, client_p
);
184 void abort_blacklist_queries(struct Client
*client_p
)
186 dlink_node
*ptr
, *next_ptr
;
187 struct BlacklistClient
*blcptr
;
189 if (client_p
->preClient
== NULL
)
191 DLINK_FOREACH_SAFE(ptr
, next_ptr
, client_p
->preClient
->dnsbl_queries
.head
)
194 dlinkDelete(&blcptr
->node
, &client_p
->preClient
->dnsbl_queries
);
195 unref_blacklist(blcptr
->blacklist
);
196 delete_resolver_queries(&blcptr
->dns_query
);
201 void destroy_blacklists(void)
203 dlink_node
*ptr
, *next_ptr
;
204 struct Blacklist
*blptr
;
206 DLINK_FOREACH_SAFE(ptr
, next_ptr
, blacklist_list
.head
)
209 blptr
->hits
= 0; /* keep it simple and consistent */
210 if (blptr
->refcount
> 0)
211 blptr
->status
|= CONF_ILLEGAL
;
215 dlinkDestroy(ptr
, &blacklist_list
);