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21c9d815 VY |
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 | |
d1275a8f | 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
21c9d815 VY |
21 | * USA |
22 | * | |
d1275a8f | 23 | * $Id: reject.c 25119 2008-03-13 16:57:05Z androsyn $ |
21c9d815 VY |
24 | */ |
25 | ||
26 | #include "stdinc.h" | |
21c9d815 VY |
27 | #include "client.h" |
28 | #include "s_conf.h" | |
29 | #include "reject.h" | |
30 | #include "s_stats.h" | |
d1275a8f JT |
31 | #include "ircd.h" |
32 | #include "send.h" | |
33 | #include "numeric.h" | |
34 | #include "parse.h" | |
35 | #include "hostmask.h" | |
36 | #include "match.h" | |
21c9d815 VY |
37 | #include "hash.h" |
38 | ||
07943cb5 | 39 | static rb_patricia_tree_t *reject_tree; |
d1275a8f | 40 | static rb_dlink_list delay_exit; |
21c9d815 | 41 | static rb_dlink_list reject_list; |
d1275a8f JT |
42 | static rb_dlink_list throttle_list; |
43 | static rb_patricia_tree_t *throttle_tree; | |
44 | static void throttle_expires(void *unused); | |
21c9d815 | 45 | |
21c9d815 | 46 | |
d1275a8f | 47 | typedef struct _reject_data |
21c9d815 VY |
48 | { |
49 | rb_dlink_node rnode; | |
50 | time_t time; | |
51 | unsigned int count; | |
52 | uint32_t mask_hashv; | |
d1275a8f JT |
53 | } reject_t; |
54 | ||
55 | typedef struct _delay_data | |
56 | { | |
57 | rb_dlink_node node; | |
58 | rb_fde_t *F; | |
59 | } delay_t; | |
60 | ||
61 | typedef struct _throttle | |
62 | { | |
63 | rb_dlink_node node; | |
64 | time_t last; | |
65 | int count; | |
66 | } throttle_t; | |
67 | ||
68 | unsigned long | |
69 | delay_exit_length(void) | |
70 | { | |
71 | return rb_dlink_list_length(&delay_exit); | |
72 | } | |
21c9d815 | 73 | |
21c9d815 VY |
74 | static void |
75 | reject_exit(void *unused) | |
76 | { | |
21c9d815 | 77 | rb_dlink_node *ptr, *ptr_next; |
d1275a8f JT |
78 | delay_t *ddata; |
79 | static const char *errbuf = "ERROR :Closing Link: (*** Banned (cache))\r\n"; | |
80 | ||
21c9d815 VY |
81 | RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head) |
82 | { | |
d1275a8f JT |
83 | ddata = ptr->data; |
84 | ||
85 | rb_write(ddata->F, errbuf, strlen(errbuf)); | |
86 | rb_close(ddata->F); | |
87 | rb_free(ddata); | |
21c9d815 VY |
88 | } |
89 | ||
d1275a8f JT |
90 | delay_exit.head = delay_exit.tail = NULL; |
91 | delay_exit.length = 0; | |
21c9d815 VY |
92 | } |
93 | ||
94 | static void | |
95 | reject_expires(void *unused) | |
96 | { | |
97 | rb_dlink_node *ptr, *next; | |
07943cb5 | 98 | rb_patricia_node_t *pnode; |
d1275a8f | 99 | reject_t *rdata; |
21c9d815 VY |
100 | |
101 | RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) | |
102 | { | |
103 | pnode = ptr->data; | |
104 | rdata = pnode->data; | |
105 | ||
106 | if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time()) | |
107 | continue; | |
108 | ||
109 | rb_dlinkDelete(ptr, &reject_list); | |
110 | rb_free(rdata); | |
07943cb5 | 111 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
112 | } |
113 | } | |
114 | ||
115 | void | |
116 | init_reject(void) | |
117 | { | |
07943cb5 | 118 | reject_tree = rb_new_patricia(PATRICIA_BITS); |
d1275a8f | 119 | throttle_tree = rb_new_patricia(PATRICIA_BITS); |
21c9d815 VY |
120 | rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME); |
121 | rb_event_add("reject_expires", reject_expires, NULL, 60); | |
d1275a8f | 122 | rb_event_add("throttle_expires", throttle_expires, NULL, 10); |
21c9d815 VY |
123 | } |
124 | ||
76d49681 JT |
125 | unsigned long |
126 | throttle_size(void) | |
127 | { | |
84bfb8cc JT |
128 | unsigned long count; |
129 | rb_dlink_node *ptr; | |
130 | rb_patricia_node_t *pnode; | |
131 | throttle_t *t; | |
132 | ||
133 | count = 0; | |
134 | RB_DLINK_FOREACH(ptr, throttle_list.head) | |
135 | { | |
136 | pnode = ptr->data; | |
137 | t = pnode->data; | |
138 | if (t->count > ConfigFileEntry.throttle_count) | |
139 | count++; | |
140 | } | |
141 | ||
142 | return count; | |
76d49681 | 143 | } |
21c9d815 VY |
144 | |
145 | void | |
146 | add_reject(struct Client *client_p, const char *mask1, const char *mask2) | |
147 | { | |
07943cb5 | 148 | rb_patricia_node_t *pnode; |
d1275a8f | 149 | reject_t *rdata; |
21c9d815 VY |
150 | uint32_t hashv; |
151 | ||
152 | /* Reject is disabled */ | |
d1275a8f | 153 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) |
21c9d815 VY |
154 | return; |
155 | ||
156 | hashv = 0; | |
157 | if (mask1 != NULL) | |
d1275a8f | 158 | hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32); |
21c9d815 | 159 | if (mask2 != NULL) |
d1275a8f | 160 | hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32); |
21c9d815 | 161 | |
07943cb5 | 162 | if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL) |
21c9d815 VY |
163 | { |
164 | rdata = pnode->data; | |
165 | rdata->time = rb_current_time(); | |
166 | rdata->count++; | |
167 | } | |
168 | else | |
169 | { | |
170 | int bitlen = 32; | |
2c2e0aa9 | 171 | #ifdef RB_IPV6 |
d1275a8f | 172 | if(GET_SS_FAMILY(&client_p->localClient->ip) == AF_INET6) |
21c9d815 VY |
173 | bitlen = 128; |
174 | #endif | |
175 | pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen); | |
d1275a8f | 176 | pnode->data = rdata = rb_malloc(sizeof(reject_t)); |
21c9d815 VY |
177 | rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list); |
178 | rdata->time = rb_current_time(); | |
179 | rdata->count = 1; | |
180 | } | |
181 | rdata->mask_hashv = hashv; | |
182 | } | |
183 | ||
184 | int | |
d1275a8f | 185 | check_reject(rb_fde_t *F, struct sockaddr *addr) |
21c9d815 | 186 | { |
07943cb5 | 187 | rb_patricia_node_t *pnode; |
d1275a8f JT |
188 | reject_t *rdata; |
189 | delay_t *ddata; | |
21c9d815 | 190 | /* Reject is disabled */ |
d1275a8f | 191 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) |
21c9d815 VY |
192 | return 0; |
193 | ||
d1275a8f | 194 | pnode = rb_match_ip(reject_tree, addr); |
21c9d815 VY |
195 | if(pnode != NULL) |
196 | { | |
197 | rdata = pnode->data; | |
198 | ||
199 | rdata->time = rb_current_time(); | |
d1275a8f | 200 | if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count) |
21c9d815 | 201 | { |
d1275a8f | 202 | ddata = rb_malloc(sizeof(delay_t)); |
83251205 | 203 | ServerStats.is_rej++; |
d1275a8f JT |
204 | rb_setselect(F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL); |
205 | ddata->F = F; | |
206 | rb_dlinkAdd(ddata, &ddata->node, &delay_exit); | |
21c9d815 VY |
207 | return 1; |
208 | } | |
209 | } | |
210 | /* Caller does what it wants */ | |
211 | return 0; | |
212 | } | |
213 | ||
214 | void | |
215 | flush_reject(void) | |
216 | { | |
217 | rb_dlink_node *ptr, *next; | |
07943cb5 | 218 | rb_patricia_node_t *pnode; |
d1275a8f | 219 | reject_t *rdata; |
21c9d815 VY |
220 | |
221 | RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) | |
222 | { | |
223 | pnode = ptr->data; | |
224 | rdata = pnode->data; | |
225 | rb_dlinkDelete(ptr, &reject_list); | |
226 | rb_free(rdata); | |
07943cb5 | 227 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
228 | } |
229 | } | |
230 | ||
231 | int | |
232 | remove_reject_ip(const char *ip) | |
233 | { | |
07943cb5 | 234 | rb_patricia_node_t *pnode; |
21c9d815 VY |
235 | |
236 | /* Reject is disabled */ | |
d1275a8f | 237 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) |
21c9d815 VY |
238 | return -1; |
239 | ||
07943cb5 | 240 | if((pnode = rb_match_string(reject_tree, ip)) != NULL) |
21c9d815 | 241 | { |
d1275a8f | 242 | reject_t *rdata = pnode->data; |
21c9d815 VY |
243 | rb_dlinkDelete(&rdata->rnode, &reject_list); |
244 | rb_free(rdata); | |
07943cb5 | 245 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
246 | return 1; |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
251 | int | |
252 | remove_reject_mask(const char *mask1, const char *mask2) | |
253 | { | |
254 | rb_dlink_node *ptr, *next; | |
07943cb5 | 255 | rb_patricia_node_t *pnode; |
d1275a8f | 256 | reject_t *rdata; |
21c9d815 VY |
257 | uint32_t hashv; |
258 | int n = 0; | |
259 | ||
260 | hashv = 0; | |
261 | if (mask1 != NULL) | |
d1275a8f | 262 | hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32); |
21c9d815 | 263 | if (mask2 != NULL) |
d1275a8f | 264 | hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32); |
21c9d815 VY |
265 | RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) |
266 | { | |
267 | pnode = ptr->data; | |
268 | rdata = pnode->data; | |
269 | if (rdata->mask_hashv == hashv) | |
270 | { | |
271 | rb_dlinkDelete(ptr, &reject_list); | |
272 | rb_free(rdata); | |
07943cb5 | 273 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
274 | n++; |
275 | } | |
276 | } | |
277 | return n; | |
278 | } | |
279 | ||
21c9d815 | 280 | int |
d1275a8f | 281 | throttle_add(struct sockaddr *addr) |
21c9d815 | 282 | { |
d1275a8f | 283 | throttle_t *t; |
07943cb5 | 284 | rb_patricia_node_t *pnode; |
21c9d815 | 285 | |
d1275a8f | 286 | if((pnode = rb_match_ip(throttle_tree, addr)) != NULL) |
21c9d815 | 287 | { |
d1275a8f JT |
288 | t = pnode->data; |
289 | ||
290 | if(t->count > ConfigFileEntry.throttle_count) | |
76d49681 JT |
291 | { |
292 | ServerStats.is_thr++; | |
293 | return 1; | |
294 | } | |
d1275a8f JT |
295 | /* Stop penalizing them after they've been throttled */ |
296 | t->last = rb_current_time(); | |
297 | t->count++; | |
298 | ||
299 | } else { | |
21c9d815 | 300 | int bitlen = 32; |
2c2e0aa9 | 301 | #ifdef RB_IPV6 |
d1275a8f | 302 | if(GET_SS_FAMILY(addr) == AF_INET6) |
21c9d815 VY |
303 | bitlen = 128; |
304 | #endif | |
d1275a8f JT |
305 | t = rb_malloc(sizeof(throttle_t)); |
306 | t->last = rb_current_time(); | |
307 | t->count = 1; | |
308 | pnode = make_and_lookup_ip(throttle_tree, addr, bitlen); | |
309 | pnode->data = t; | |
310 | rb_dlinkAdd(pnode, &t->node, &throttle_list); | |
311 | } | |
21c9d815 VY |
312 | return 0; |
313 | } | |
314 | ||
d1275a8f JT |
315 | static void |
316 | throttle_expires(void *unused) | |
21c9d815 | 317 | { |
d1275a8f | 318 | rb_dlink_node *ptr, *next; |
07943cb5 | 319 | rb_patricia_node_t *pnode; |
d1275a8f JT |
320 | throttle_t *t; |
321 | ||
322 | RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head) | |
21c9d815 | 323 | { |
d1275a8f JT |
324 | pnode = ptr->data; |
325 | t = pnode->data; | |
326 | ||
327 | if(t->last + ConfigFileEntry.throttle_duration > rb_current_time()) | |
328 | continue; | |
329 | ||
330 | rb_dlinkDelete(ptr, &throttle_list); | |
331 | rb_free(t); | |
332 | rb_patricia_remove(throttle_tree, pnode); | |
21c9d815 | 333 | } |
21c9d815 | 334 | } |
d1275a8f | 335 |