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212380e3 AC |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd | |
3 | * reject.c: reject users with prejudice | |
4 | * | |
5 | * Copyright (C) 2003 Aaron Sethman <androsyn@ratbox.org> | |
6 | * Copyright (C) 2003-2005 ircd-ratbox development team | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
21 | * USA | |
22 | * | |
23 | * $Id: reject.c 849 2006-02-15 01:33:43Z jilles $ | |
24 | */ | |
25 | ||
26 | #include "stdinc.h" | |
27 | #include "config.h" | |
28 | #include "patricia.h" | |
29 | #include "client.h" | |
30 | #include "s_conf.h" | |
31 | #include "event.h" | |
32 | #include "tools.h" | |
33 | #include "reject.h" | |
34 | #include "s_stats.h" | |
35 | #include "msg.h" | |
36 | ||
37 | static patricia_tree_t *reject_tree; | |
38 | dlink_list delay_exit; | |
39 | static dlink_list reject_list; | |
40 | ||
41 | struct reject_data | |
42 | { | |
43 | dlink_node rnode; | |
44 | time_t time; | |
45 | unsigned int count; | |
46 | }; | |
47 | ||
48 | static void | |
49 | reject_exit(void *unused) | |
50 | { | |
51 | struct Client *client_p; | |
52 | dlink_node *ptr, *ptr_next; | |
53 | ||
54 | DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head) | |
55 | { | |
56 | client_p = ptr->data; | |
57 | if(IsDead(client_p)) | |
58 | continue; | |
59 | ||
60 | /* this MUST be here, to prevent the possibility | |
61 | * sendto_one() generates a write error, and then a client | |
62 | * ends up on the dead_list and the abort_list --fl | |
63 | * | |
64 | * new disconnect notice stolen from ircu --nenolod | |
65 | * no, this only happens when someone's IP has some | |
66 | * ban on it and rejects them rather longer than the | |
67 | * ircu message suggests --jilles | |
68 | */ | |
69 | if(!IsIOError(client_p)) | |
70 | sendto_one(client_p, "ERROR :Closing Link: %s (*** Banned (cache))", client_p->host); | |
71 | ||
72 | close_connection(client_p); | |
73 | SetDead(client_p); | |
74 | dlinkAddAlloc(client_p, &dead_list); | |
75 | } | |
76 | ||
77 | delay_exit.head = delay_exit.tail = NULL; | |
78 | delay_exit.length = 0; | |
79 | } | |
80 | ||
81 | static void | |
82 | reject_expires(void *unused) | |
83 | { | |
84 | dlink_node *ptr, *next; | |
85 | patricia_node_t *pnode; | |
86 | struct reject_data *rdata; | |
87 | ||
88 | DLINK_FOREACH_SAFE(ptr, next, reject_list.head) | |
89 | { | |
90 | pnode = ptr->data; | |
91 | rdata = pnode->data; | |
92 | ||
93 | if(rdata->time + ConfigFileEntry.reject_duration > CurrentTime) | |
94 | continue; | |
95 | ||
96 | dlinkDelete(ptr, &reject_list); | |
97 | MyFree(rdata); | |
98 | patricia_remove(reject_tree, pnode); | |
99 | } | |
100 | } | |
101 | ||
102 | void | |
103 | init_reject(void) | |
104 | { | |
105 | reject_tree = New_Patricia(PATRICIA_BITS); | |
106 | eventAdd("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME); | |
107 | eventAdd("reject_expires", reject_expires, NULL, 60); | |
108 | } | |
109 | ||
110 | ||
111 | void | |
112 | add_reject(struct Client *client_p) | |
113 | { | |
114 | patricia_node_t *pnode; | |
115 | struct reject_data *rdata; | |
116 | ||
117 | /* Reject is disabled */ | |
118 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0) | |
119 | return; | |
120 | ||
121 | if((pnode = match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL) | |
122 | { | |
123 | rdata = pnode->data; | |
124 | rdata->time = CurrentTime; | |
125 | rdata->count++; | |
126 | } | |
127 | else | |
128 | { | |
129 | int bitlen = 32; | |
130 | #ifdef IPV6 | |
131 | if(client_p->localClient->ip.ss_family == AF_INET6) | |
132 | bitlen = 128; | |
133 | #endif | |
134 | pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen); | |
135 | pnode->data = rdata = MyMalloc(sizeof(struct reject_data)); | |
136 | dlinkAddTail(pnode, &rdata->rnode, &reject_list); | |
137 | rdata->time = CurrentTime; | |
138 | rdata->count = 1; | |
139 | } | |
140 | } | |
141 | ||
142 | int | |
143 | check_reject(struct Client *client_p) | |
144 | { | |
145 | patricia_node_t *pnode; | |
146 | struct reject_data *rdata; | |
147 | ||
148 | /* Reject is disabled */ | |
149 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 || | |
150 | ConfigFileEntry.reject_duration == 0) | |
151 | return 0; | |
152 | ||
153 | pnode = match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip); | |
154 | if(pnode != NULL) | |
155 | { | |
156 | rdata = pnode->data; | |
157 | ||
158 | rdata->time = CurrentTime; | |
159 | if(rdata->count > ConfigFileEntry.reject_after_count) | |
160 | { | |
161 | ServerStats->is_rej++; | |
162 | SetReject(client_p); | |
163 | comm_setselect(client_p->localClient->fd, FDLIST_NONE, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0); | |
164 | SetClosing(client_p); | |
165 | dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &delay_exit); | |
166 | return 1; | |
167 | } | |
168 | } | |
169 | /* Caller does what it wants */ | |
170 | return 0; | |
171 | } | |
172 | ||
173 | void | |
174 | flush_reject(void) | |
175 | { | |
176 | dlink_node *ptr, *next; | |
177 | patricia_node_t *pnode; | |
178 | struct reject_data *rdata; | |
179 | ||
180 | DLINK_FOREACH_SAFE(ptr, next, reject_list.head) | |
181 | { | |
182 | pnode = ptr->data; | |
183 | rdata = pnode->data; | |
184 | dlinkDelete(ptr, &reject_list); | |
185 | MyFree(rdata); | |
186 | patricia_remove(reject_tree, pnode); | |
187 | } | |
188 | } | |
189 | ||
190 | int | |
191 | remove_reject(const char *ip) | |
192 | { | |
193 | patricia_node_t *pnode; | |
194 | ||
195 | /* Reject is disabled */ | |
196 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_ban_time == 0 || | |
197 | ConfigFileEntry.reject_duration == 0) | |
198 | return -1; | |
199 | ||
200 | if((pnode = match_string(reject_tree, ip)) != NULL) | |
201 | { | |
202 | struct reject_data *rdata = pnode->data; | |
203 | dlinkDelete(&rdata->rnode, &reject_list); | |
204 | MyFree(rdata); | |
205 | patricia_remove(reject_tree, pnode); | |
206 | return 1; | |
207 | } | |
208 | return 0; | |
209 | } | |
210 |