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Commit | Line | Data |
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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 | * | |
21c9d815 VY |
23 | */ |
24 | ||
25 | #include "stdinc.h" | |
21c9d815 VY |
26 | #include "client.h" |
27 | #include "s_conf.h" | |
28 | #include "reject.h" | |
29 | #include "s_stats.h" | |
d1275a8f JT |
30 | #include "ircd.h" |
31 | #include "send.h" | |
32 | #include "numeric.h" | |
33 | #include "parse.h" | |
34 | #include "hostmask.h" | |
35 | #include "match.h" | |
21c9d815 VY |
36 | #include "hash.h" |
37 | ||
07943cb5 | 38 | static rb_patricia_tree_t *reject_tree; |
d1275a8f | 39 | static rb_dlink_list delay_exit; |
21c9d815 | 40 | static rb_dlink_list reject_list; |
d1275a8f JT |
41 | static rb_dlink_list throttle_list; |
42 | static rb_patricia_tree_t *throttle_tree; | |
43 | static void throttle_expires(void *unused); | |
21c9d815 | 44 | |
21c9d815 | 45 | |
d1275a8f | 46 | typedef struct _reject_data |
21c9d815 VY |
47 | { |
48 | rb_dlink_node rnode; | |
49 | time_t time; | |
50 | unsigned int count; | |
51 | uint32_t mask_hashv; | |
d1275a8f JT |
52 | } reject_t; |
53 | ||
54 | typedef struct _delay_data | |
55 | { | |
56 | rb_dlink_node node; | |
57 | rb_fde_t *F; | |
58 | } delay_t; | |
59 | ||
60 | typedef struct _throttle | |
61 | { | |
62 | rb_dlink_node node; | |
63 | time_t last; | |
64 | int count; | |
65 | } throttle_t; | |
66 | ||
67 | unsigned long | |
68 | delay_exit_length(void) | |
69 | { | |
70 | return rb_dlink_list_length(&delay_exit); | |
71 | } | |
21c9d815 | 72 | |
21c9d815 VY |
73 | static void |
74 | reject_exit(void *unused) | |
75 | { | |
21c9d815 | 76 | rb_dlink_node *ptr, *ptr_next; |
d1275a8f JT |
77 | delay_t *ddata; |
78 | static const char *errbuf = "ERROR :Closing Link: (*** Banned (cache))\r\n"; | |
79 | ||
21c9d815 VY |
80 | RB_DLINK_FOREACH_SAFE(ptr, ptr_next, delay_exit.head) |
81 | { | |
d1275a8f JT |
82 | ddata = ptr->data; |
83 | ||
84 | rb_write(ddata->F, errbuf, strlen(errbuf)); | |
85 | rb_close(ddata->F); | |
86 | rb_free(ddata); | |
21c9d815 VY |
87 | } |
88 | ||
d1275a8f JT |
89 | delay_exit.head = delay_exit.tail = NULL; |
90 | delay_exit.length = 0; | |
21c9d815 VY |
91 | } |
92 | ||
93 | static void | |
94 | reject_expires(void *unused) | |
95 | { | |
96 | rb_dlink_node *ptr, *next; | |
07943cb5 | 97 | rb_patricia_node_t *pnode; |
d1275a8f | 98 | reject_t *rdata; |
21c9d815 VY |
99 | |
100 | RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) | |
101 | { | |
102 | pnode = ptr->data; | |
103 | rdata = pnode->data; | |
104 | ||
105 | if(rdata->time + ConfigFileEntry.reject_duration > rb_current_time()) | |
106 | continue; | |
107 | ||
108 | rb_dlinkDelete(ptr, &reject_list); | |
109 | rb_free(rdata); | |
07943cb5 | 110 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
111 | } |
112 | } | |
113 | ||
114 | void | |
115 | init_reject(void) | |
116 | { | |
07943cb5 | 117 | reject_tree = rb_new_patricia(PATRICIA_BITS); |
d1275a8f | 118 | throttle_tree = rb_new_patricia(PATRICIA_BITS); |
21c9d815 VY |
119 | rb_event_add("reject_exit", reject_exit, NULL, DELAYED_EXIT_TIME); |
120 | rb_event_add("reject_expires", reject_expires, NULL, 60); | |
d1275a8f | 121 | rb_event_add("throttle_expires", throttle_expires, NULL, 10); |
21c9d815 VY |
122 | } |
123 | ||
76d49681 JT |
124 | unsigned long |
125 | throttle_size(void) | |
126 | { | |
84bfb8cc JT |
127 | unsigned long count; |
128 | rb_dlink_node *ptr; | |
129 | rb_patricia_node_t *pnode; | |
130 | throttle_t *t; | |
131 | ||
132 | count = 0; | |
133 | RB_DLINK_FOREACH(ptr, throttle_list.head) | |
134 | { | |
135 | pnode = ptr->data; | |
136 | t = pnode->data; | |
137 | if (t->count > ConfigFileEntry.throttle_count) | |
138 | count++; | |
139 | } | |
140 | ||
141 | return count; | |
76d49681 | 142 | } |
21c9d815 VY |
143 | |
144 | void | |
145 | add_reject(struct Client *client_p, const char *mask1, const char *mask2) | |
146 | { | |
07943cb5 | 147 | rb_patricia_node_t *pnode; |
d1275a8f | 148 | reject_t *rdata; |
21c9d815 VY |
149 | uint32_t hashv; |
150 | ||
151 | /* Reject is disabled */ | |
d1275a8f | 152 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) |
21c9d815 VY |
153 | return; |
154 | ||
155 | hashv = 0; | |
156 | if (mask1 != NULL) | |
d1275a8f | 157 | hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32); |
21c9d815 | 158 | if (mask2 != NULL) |
d1275a8f | 159 | hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32); |
21c9d815 | 160 | |
07943cb5 | 161 | if((pnode = rb_match_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip)) != NULL) |
21c9d815 VY |
162 | { |
163 | rdata = pnode->data; | |
164 | rdata->time = rb_current_time(); | |
165 | rdata->count++; | |
166 | } | |
167 | else | |
168 | { | |
169 | int bitlen = 32; | |
2c2e0aa9 | 170 | #ifdef RB_IPV6 |
d1275a8f | 171 | if(GET_SS_FAMILY(&client_p->localClient->ip) == AF_INET6) |
21c9d815 VY |
172 | bitlen = 128; |
173 | #endif | |
174 | pnode = make_and_lookup_ip(reject_tree, (struct sockaddr *)&client_p->localClient->ip, bitlen); | |
d1275a8f | 175 | pnode->data = rdata = rb_malloc(sizeof(reject_t)); |
21c9d815 VY |
176 | rb_dlinkAddTail(pnode, &rdata->rnode, &reject_list); |
177 | rdata->time = rb_current_time(); | |
178 | rdata->count = 1; | |
179 | } | |
180 | rdata->mask_hashv = hashv; | |
181 | } | |
182 | ||
183 | int | |
d1275a8f | 184 | check_reject(rb_fde_t *F, struct sockaddr *addr) |
21c9d815 | 185 | { |
07943cb5 | 186 | rb_patricia_node_t *pnode; |
d1275a8f JT |
187 | reject_t *rdata; |
188 | delay_t *ddata; | |
21c9d815 | 189 | /* Reject is disabled */ |
d1275a8f | 190 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) |
21c9d815 VY |
191 | return 0; |
192 | ||
d1275a8f | 193 | pnode = rb_match_ip(reject_tree, addr); |
21c9d815 VY |
194 | if(pnode != NULL) |
195 | { | |
196 | rdata = pnode->data; | |
197 | ||
198 | rdata->time = rb_current_time(); | |
d1275a8f | 199 | if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count) |
21c9d815 | 200 | { |
d1275a8f | 201 | ddata = rb_malloc(sizeof(delay_t)); |
83251205 | 202 | ServerStats.is_rej++; |
d1275a8f JT |
203 | rb_setselect(F, RB_SELECT_WRITE | RB_SELECT_READ, NULL, NULL); |
204 | ddata->F = F; | |
205 | rb_dlinkAdd(ddata, &ddata->node, &delay_exit); | |
21c9d815 VY |
206 | return 1; |
207 | } | |
208 | } | |
209 | /* Caller does what it wants */ | |
210 | return 0; | |
211 | } | |
212 | ||
760ef9e1 JT |
213 | int |
214 | is_reject_ip(struct sockaddr *addr) | |
215 | { | |
216 | rb_patricia_node_t *pnode; | |
217 | reject_t *rdata; | |
218 | int duration; | |
219 | ||
220 | /* Reject is disabled */ | |
221 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) | |
222 | return 0; | |
223 | ||
224 | pnode = rb_match_ip(reject_tree, addr); | |
225 | if(pnode != NULL) | |
226 | { | |
227 | rdata = pnode->data; | |
228 | ||
229 | if(rdata->count > (unsigned long)ConfigFileEntry.reject_after_count) | |
230 | { | |
231 | duration = rdata->time + ConfigFileEntry.reject_duration - rb_current_time(); | |
232 | return duration > 0 ? duration : 1; | |
233 | } | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
21c9d815 VY |
238 | void |
239 | flush_reject(void) | |
240 | { | |
241 | rb_dlink_node *ptr, *next; | |
07943cb5 | 242 | rb_patricia_node_t *pnode; |
d1275a8f | 243 | reject_t *rdata; |
21c9d815 VY |
244 | |
245 | RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) | |
246 | { | |
247 | pnode = ptr->data; | |
248 | rdata = pnode->data; | |
249 | rb_dlinkDelete(ptr, &reject_list); | |
250 | rb_free(rdata); | |
07943cb5 | 251 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
252 | } |
253 | } | |
254 | ||
255 | int | |
256 | remove_reject_ip(const char *ip) | |
257 | { | |
07943cb5 | 258 | rb_patricia_node_t *pnode; |
21c9d815 VY |
259 | |
260 | /* Reject is disabled */ | |
d1275a8f | 261 | if(ConfigFileEntry.reject_after_count == 0 || ConfigFileEntry.reject_duration == 0) |
21c9d815 VY |
262 | return -1; |
263 | ||
07943cb5 | 264 | if((pnode = rb_match_string(reject_tree, ip)) != NULL) |
21c9d815 | 265 | { |
d1275a8f | 266 | reject_t *rdata = pnode->data; |
21c9d815 VY |
267 | rb_dlinkDelete(&rdata->rnode, &reject_list); |
268 | rb_free(rdata); | |
07943cb5 | 269 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
270 | return 1; |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
275 | int | |
276 | remove_reject_mask(const char *mask1, const char *mask2) | |
277 | { | |
278 | rb_dlink_node *ptr, *next; | |
07943cb5 | 279 | rb_patricia_node_t *pnode; |
d1275a8f | 280 | reject_t *rdata; |
21c9d815 VY |
281 | uint32_t hashv; |
282 | int n = 0; | |
283 | ||
284 | hashv = 0; | |
285 | if (mask1 != NULL) | |
d1275a8f | 286 | hashv ^= fnv_hash_upper((const unsigned char *)mask1, 32); |
21c9d815 | 287 | if (mask2 != NULL) |
d1275a8f | 288 | hashv ^= fnv_hash_upper((const unsigned char *)mask2, 32); |
21c9d815 VY |
289 | RB_DLINK_FOREACH_SAFE(ptr, next, reject_list.head) |
290 | { | |
291 | pnode = ptr->data; | |
292 | rdata = pnode->data; | |
293 | if (rdata->mask_hashv == hashv) | |
294 | { | |
295 | rb_dlinkDelete(ptr, &reject_list); | |
296 | rb_free(rdata); | |
07943cb5 | 297 | rb_patricia_remove(reject_tree, pnode); |
21c9d815 VY |
298 | n++; |
299 | } | |
300 | } | |
301 | return n; | |
302 | } | |
303 | ||
21c9d815 | 304 | int |
d1275a8f | 305 | throttle_add(struct sockaddr *addr) |
21c9d815 | 306 | { |
d1275a8f | 307 | throttle_t *t; |
07943cb5 | 308 | rb_patricia_node_t *pnode; |
21c9d815 | 309 | |
d1275a8f | 310 | if((pnode = rb_match_ip(throttle_tree, addr)) != NULL) |
21c9d815 | 311 | { |
d1275a8f JT |
312 | t = pnode->data; |
313 | ||
314 | if(t->count > ConfigFileEntry.throttle_count) | |
76d49681 JT |
315 | { |
316 | ServerStats.is_thr++; | |
317 | return 1; | |
318 | } | |
d1275a8f JT |
319 | /* Stop penalizing them after they've been throttled */ |
320 | t->last = rb_current_time(); | |
321 | t->count++; | |
322 | ||
323 | } else { | |
21c9d815 | 324 | int bitlen = 32; |
2c2e0aa9 | 325 | #ifdef RB_IPV6 |
d1275a8f | 326 | if(GET_SS_FAMILY(addr) == AF_INET6) |
21c9d815 VY |
327 | bitlen = 128; |
328 | #endif | |
d1275a8f JT |
329 | t = rb_malloc(sizeof(throttle_t)); |
330 | t->last = rb_current_time(); | |
331 | t->count = 1; | |
332 | pnode = make_and_lookup_ip(throttle_tree, addr, bitlen); | |
333 | pnode->data = t; | |
334 | rb_dlinkAdd(pnode, &t->node, &throttle_list); | |
335 | } | |
21c9d815 VY |
336 | return 0; |
337 | } | |
338 | ||
760ef9e1 JT |
339 | int |
340 | is_throttle_ip(struct sockaddr *addr) | |
341 | { | |
342 | throttle_t *t; | |
343 | rb_patricia_node_t *pnode; | |
344 | int duration; | |
345 | ||
346 | if((pnode = rb_match_ip(throttle_tree, addr)) != NULL) | |
347 | { | |
348 | t = pnode->data; | |
349 | if(t->count > ConfigFileEntry.throttle_count) | |
350 | { | |
351 | duration = t->last + ConfigFileEntry.throttle_duration - rb_current_time(); | |
352 | return duration > 0 ? duration : 1; | |
353 | } | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
0b1e46f5 JT |
358 | void |
359 | flush_throttle(void) | |
360 | { | |
361 | rb_dlink_node *ptr, *next; | |
362 | rb_patricia_node_t *pnode; | |
363 | throttle_t *t; | |
364 | ||
365 | RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head) | |
366 | { | |
367 | pnode = ptr->data; | |
368 | t = pnode->data; | |
369 | ||
370 | rb_dlinkDelete(ptr, &throttle_list); | |
371 | rb_free(t); | |
372 | rb_patricia_remove(throttle_tree, pnode); | |
373 | } | |
374 | } | |
375 | ||
d1275a8f JT |
376 | static void |
377 | throttle_expires(void *unused) | |
21c9d815 | 378 | { |
d1275a8f | 379 | rb_dlink_node *ptr, *next; |
07943cb5 | 380 | rb_patricia_node_t *pnode; |
d1275a8f JT |
381 | throttle_t *t; |
382 | ||
383 | RB_DLINK_FOREACH_SAFE(ptr, next, throttle_list.head) | |
21c9d815 | 384 | { |
d1275a8f JT |
385 | pnode = ptr->data; |
386 | t = pnode->data; | |
387 | ||
388 | if(t->last + ConfigFileEntry.throttle_duration > rb_current_time()) | |
389 | continue; | |
390 | ||
391 | rb_dlinkDelete(ptr, &throttle_list); | |
392 | rb_free(t); | |
393 | rb_patricia_remove(throttle_tree, pnode); | |
21c9d815 | 394 | } |
21c9d815 | 395 | } |
d1275a8f | 396 |