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Fix /links buffer overflow.
[solanum.git] / modules / m_xline.c
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1/* modules/m_xline.c
2 *
3 * Copyright (C) 2002-2003 Lee Hardy <lee@leeh.co.uk>
4 * Copyright (C) 2002-2005 ircd-ratbox development team
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * 1.Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 * 2.Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3.The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 *
8bbeb278 30 * $Id$
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31 */
32
33#include "stdinc.h"
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34#include "send.h"
35#include "channel.h"
36#include "client.h"
37#include "common.h"
38#include "config.h"
39#include "class.h"
40#include "ircd.h"
41#include "numeric.h"
4016731b 42#include "logger.h"
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43#include "s_serv.h"
44#include "whowas.h"
4562c604 45#include "match.h"
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46#include "hash.h"
47#include "msg.h"
48#include "parse.h"
49#include "modules.h"
50#include "s_conf.h"
51#include "s_newconf.h"
35f6f850 52#include "reject.h"
8bbeb278 53#include "bandbi.h"
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54
55static int mo_xline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
56static int ms_xline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
57static int me_xline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]);
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58static int mo_unxline(struct Client *client_p, struct Client *source_p, int parc,
59 const char *parv[]);
60static int ms_unxline(struct Client *client_p, struct Client *source_p, int parc,
61 const char *parv[]);
62static int me_unxline(struct Client *client_p, struct Client *source_p, int parc,
63 const char *parv[]);
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64
65struct Message xline_msgtab = {
66 "XLINE", 0, 0, 0, MFLG_SLOW,
67 {mg_unreg, mg_not_oper, {ms_xline, 5}, {ms_xline, 5}, {me_xline, 5}, {mo_xline, 3}}
68};
8bbeb278 69
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70struct Message unxline_msgtab = {
71 "UNXLINE", 0, 0, 0, MFLG_SLOW,
72 {mg_unreg, mg_not_oper, {ms_unxline, 3}, {ms_unxline, 3}, {me_unxline, 2}, {mo_unxline, 2}}
73};
74
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75mapi_clist_av1 xline_clist[] = { &xline_msgtab, &unxline_msgtab, NULL };
76
77DECLARE_MODULE_AV1(xline, NULL, NULL, xline_clist, NULL, NULL, "$Revision$");
212380e3 78
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79static int valid_xline(struct Client *, const char *, const char *);
80static void apply_xline(struct Client *client_p, const char *name,
212380e3 81 const char *reason, int temp_time);
212380e3 82static void propagate_xline(struct Client *source_p, const char *target,
8bbeb278 83 int temp_time, const char *name, const char *type, const char *reason);
212380e3 84static void cluster_xline(struct Client *source_p, int temp_time,
8bbeb278 85 const char *name, const char *reason);
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86
87static void handle_remote_xline(struct Client *source_p, int temp_time,
88 const char *name, const char *reason);
89static void handle_remote_unxline(struct Client *source_p, const char *name);
90
60c96e64 91static void remove_xline(struct Client *source_p, const char *name);
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92
93
94/* m_xline()
95 *
96 * parv[1] - thing to xline
97 * parv[2] - optional type/reason
98 * parv[3] - reason
99 */
100static int
101mo_xline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
102{
103 struct ConfItem *aconf;
104 const char *name;
105 const char *reason;
106 const char *target_server = NULL;
107 int temp_time;
108 int loc = 1;
109
110 if(!IsOperXline(source_p))
111 {
8bbeb278 112 sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "xline");
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113 return 0;
114 }
115
116 if((temp_time = valid_temp_time(parv[loc])) >= 0)
117 loc++;
118 /* we just set temp_time to -1! */
119 else
120 temp_time = 0;
121
122 name = parv[loc];
123 loc++;
124
125 /* XLINE <gecos> ON <server> :<reason> */
8bbeb278 126 if(parc >= loc + 2 && !irccmp(parv[loc], "ON"))
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127 {
128 if(!IsOperRemoteBan(source_p))
129 {
130 sendto_one(source_p, form_str(ERR_NOPRIVS),
8bbeb278 131 me.name, source_p->name, "remoteban");
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132 return 0;
133 }
134
8bbeb278 135 target_server = parv[loc + 1];
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136 loc += 2;
137 }
138
139 if(parc <= loc || EmptyString(parv[loc]))
140 {
141 sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
8bbeb278 142 me.name, source_p->name, "XLINE");
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143 return 0;
144 }
145
146 reason = parv[loc];
147
148 if(target_server != NULL)
149 {
8bbeb278 150 propagate_xline(source_p, target_server, temp_time, name, "2", reason);
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151
152 if(!match(target_server, me.name))
153 return 0;
154 }
5b96d9a6 155 else if(rb_dlink_list_length(&cluster_conf_list) > 0)
8bbeb278 156 cluster_xline(source_p, temp_time, name, reason);
212380e3 157
8bbeb278 158 if((aconf = find_xline_mask(name)) != NULL)
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159 {
160 sendto_one(source_p, ":%s NOTICE %s :[%s] already X-Lined by [%s] - %s",
23959371 161 me.name, source_p->name, name, aconf->host, aconf->passwd);
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162 return 0;
163 }
164
8bbeb278 165 if(!valid_xline(source_p, name, reason))
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166 return 0;
167
8bbeb278 168 apply_xline(source_p, name, reason, temp_time);
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169
170 return 0;
171}
172
173/* ms_xline()
174 *
175 * handles a remote xline
176 */
177static int
178ms_xline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
179{
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180 /* parv[0] parv[1] parv[2] parv[3] parv[4]
181 * oper target serv xline type reason
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182 */
183 propagate_xline(source_p, parv[1], 0, parv[2], parv[3], parv[4]);
184
185 if(!IsPerson(source_p))
186 return 0;
187
188 /* destined for me? */
189 if(!match(parv[1], me.name))
190 return 0;
191
192 handle_remote_xline(source_p, 0, parv[2], parv[4]);
193 return 0;
194}
195
196static int
197me_xline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
198{
199 /* time name type :reason */
200 if(!IsPerson(source_p))
201 return 0;
202
203 handle_remote_xline(source_p, atoi(parv[1]), parv[2], parv[4]);
204 return 0;
205}
206
207static void
8bbeb278 208handle_remote_xline(struct Client *source_p, int temp_time, const char *name, const char *reason)
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209{
210 struct ConfItem *aconf;
211
212 if(!find_shared_conf(source_p->username, source_p->host,
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213 source_p->servptr->name,
214 (temp_time > 0) ? SHARED_TXLINE : SHARED_PXLINE))
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215 return;
216
8bbeb278 217 if(!valid_xline(source_p, name, reason))
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218 return;
219
220 /* already xlined */
0fdb2570 221 if((aconf = find_xline_mask(name)) != NULL)
212380e3 222 {
23959371 223 sendto_one_notice(source_p, ":[%s] already X-Lined by [%s] - %s", name, aconf->host,
8bbeb278 224 aconf->passwd);
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225 return;
226 }
227
228 apply_xline(source_p, name, reason, temp_time);
229}
230
231/* valid_xline()
232 *
8bbeb278 233 * inputs - client xlining, gecos, reason and whether to warn
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234 * outputs -
235 * side effects - checks the xline for validity, erroring if needed
236 */
237static int
8bbeb278 238valid_xline(struct Client *source_p, const char *gecos, const char *reason)
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239{
240 if(EmptyString(reason))
241 {
242 sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
8bbeb278 243 get_id(&me, source_p), get_id(source_p, source_p), "XLINE");
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244 return 0;
245 }
246
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247 if(strchr(reason, ':') != NULL)
248 {
8bbeb278 249 sendto_one_notice(source_p, ":Invalid character ':' in comment");
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250 return 0;
251 }
252
253 if(strchr(reason, '"'))
254 {
8bbeb278 255 sendto_one_notice(source_p, ":Invalid character '\"' in comment");
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256 return 0;
257 }
258
259 if(!valid_wild_card_simple(gecos))
260 {
261 sendto_one_notice(source_p,
262 ":Please include at least %d non-wildcard "
263 "characters with the xline",
264 ConfigFileEntry.min_nonwildcard_simple);
265 return 0;
266 }
267
268 return 1;
269}
270
271void
8bbeb278 272apply_xline(struct Client *source_p, const char *name, const char *reason, int temp_time)
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273{
274 struct ConfItem *aconf;
275
276 aconf = make_conf();
277 aconf->status = CONF_XLINE;
4418166c 278 aconf->host = rb_strdup(name);
8bbeb278 279 aconf->passwd = rb_strdup(reason);
23959371 280 collapse(aconf->host);
212380e3 281
8bbeb278 282 if(temp_time > 0)
212380e3 283 {
8bbeb278 284 aconf->hold = rb_current_time() + temp_time;
212380e3 285
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286 sendto_realops_snomask(SNO_GENERAL, L_ALL,
287 "%s added temporary %d min. X-Line for [%s] [%s]",
288 get_oper_name(source_p), temp_time / 60,
23959371 289 aconf->host, reason);
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290 ilog(L_KLINE, "X %s %d %s %s",
291 get_oper_name(source_p), temp_time / 60, name, reason);
292 sendto_one_notice(source_p, ":Added temporary %d min. X-Line [%s]",
23959371 293 temp_time / 60, aconf->host);
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294 }
295 else
212380e3 296 {
8bbeb278 297 sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s added X-Line for [%s] [%s]",
23959371 298 get_oper_name(source_p), aconf->host, aconf->passwd);
8bbeb278 299 sendto_one_notice(source_p, ":Added X-Line for [%s] [%s]",
23959371 300 aconf->host, aconf->passwd);
8bbeb278 301
23959371 302 bandb_add(BANDB_XLINE, source_p, aconf->host, NULL, aconf->passwd, NULL, 0);
f36d4fdd 303 ilog(L_KLINE, "X %s 0 %s %s", get_oper_name(source_p), name, aconf->passwd);
212380e3 304 }
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305
306 rb_dlinkAddAlloc(aconf, &xline_conf_list);
307 check_xlines();
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308}
309
8bbeb278 310static void
212380e3 311propagate_xline(struct Client *source_p, const char *target,
8bbeb278 312 int temp_time, const char *name, const char *type, const char *reason)
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313{
314 if(!temp_time)
315 {
316 sendto_match_servs(source_p, target, CAP_CLUSTER, NOCAPS,
8bbeb278 317 "XLINE %s %s %s :%s", target, name, type, reason);
212380e3 318 sendto_match_servs(source_p, target, CAP_ENCAP, CAP_CLUSTER,
8bbeb278 319 "ENCAP %s XLINE %d %s 2 :%s", target, temp_time, name, reason);
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320 }
321 else
322 sendto_match_servs(source_p, target, CAP_ENCAP, NOCAPS,
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323 "ENCAP %s XLINE %d %s %s :%s",
324 target, temp_time, name, type, reason);
212380e3 325}
8bbeb278 326
212380e3 327static void
8bbeb278 328cluster_xline(struct Client *source_p, int temp_time, const char *name, const char *reason)
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329{
330 struct remote_conf *shared_p;
5b96d9a6 331 rb_dlink_node *ptr;
212380e3 332
5b96d9a6 333 RB_DLINK_FOREACH(ptr, cluster_conf_list.head)
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334 {
335 shared_p = ptr->data;
336
337 /* old protocol cant handle temps, and we dont really want
338 * to convert them to perm.. --fl
339 */
340 if(!temp_time)
341 {
342 if(!(shared_p->flags & SHARED_PXLINE))
343 continue;
344
345 sendto_match_servs(source_p, shared_p->server, CAP_CLUSTER, NOCAPS,
8bbeb278 346 "XLINE %s %s 2 :%s", shared_p->server, name, reason);
212380e3 347 sendto_match_servs(source_p, shared_p->server, CAP_ENCAP, CAP_CLUSTER,
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348 "ENCAP %s XLINE 0 %s 2 :%s",
349 shared_p->server, name, reason);
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350 }
351 else if(shared_p->flags & SHARED_TXLINE)
352 sendto_match_servs(source_p, shared_p->server, CAP_ENCAP, NOCAPS,
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353 "ENCAP %s XLINE %d %s 2 :%s",
354 shared_p->server, temp_time, name, reason);
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355 }
356}
357
358/* mo_unxline()
359 *
360 * parv[1] - thing to unxline
361 */
362static int
363mo_unxline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
364{
365 if(!IsOperXline(source_p))
366 {
8bbeb278 367 sendto_one(source_p, form_str(ERR_NOPRIVS), me.name, source_p->name, "xline");
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368 return 0;
369 }
370
371 if(parc == 4 && !(irccmp(parv[2], "ON")))
372 {
373 if(!IsOperRemoteBan(source_p))
374 {
375 sendto_one(source_p, form_str(ERR_NOPRIVS),
8bbeb278 376 me.name, source_p->name, "remoteban");
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377 return 0;
378 }
379
8bbeb278 380 propagate_generic(source_p, "UNXLINE", parv[3], CAP_CLUSTER, "%s", parv[1]);
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381
382 if(match(parv[3], me.name) == 0)
383 return 0;
384 }
5b96d9a6 385 else if(rb_dlink_list_length(&cluster_conf_list))
8bbeb278 386 cluster_generic(source_p, "UNXLINE", SHARED_UNXLINE, CAP_CLUSTER, "%s", parv[1]);
212380e3 387
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388 remove_xline(source_p, parv[1]);
389
390 return 0;
391}
392
393/* ms_unxline()
394 *
395 * handles a remote unxline
396 */
397static int
398ms_unxline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
399{
8bbeb278
AC
400 /* parv[0] parv[1] parv[2]
401 * oper target server gecos
212380e3 402 */
8bbeb278 403 propagate_generic(source_p, "UNXLINE", parv[1], CAP_CLUSTER, "%s", parv[2]);
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404
405 if(!match(parv[1], me.name))
406 return 0;
407
408 if(!IsPerson(source_p))
409 return 0;
410
411 handle_remote_unxline(source_p, parv[2]);
412 return 0;
413}
414
415static int
416me_unxline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
417{
418 /* name */
419 if(!IsPerson(source_p))
420 return 0;
421
422 handle_remote_unxline(source_p, parv[1]);
423 return 0;
424}
425
426static void
427handle_remote_unxline(struct Client *source_p, const char *name)
428{
429 if(!find_shared_conf(source_p->username, source_p->host,
8bbeb278 430 source_p->servptr->name, SHARED_UNXLINE))
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431 return;
432
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433 remove_xline(source_p, name);
434
435 return;
436}
437
60c96e64 438static void
5408b484 439remove_xline(struct Client *source_p, const char *name)
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440{
441 struct ConfItem *aconf;
5b96d9a6 442 rb_dlink_node *ptr;
212380e3 443
5b96d9a6 444 RB_DLINK_FOREACH(ptr, xline_conf_list.head)
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445 {
446 aconf = ptr->data;
447
23959371 448 if(!irccmp(aconf->host, name))
212380e3 449 {
8bbeb278 450 if(!aconf->hold)
5408b484 451 {
8bbeb278
AC
452 bandb_del(BANDB_XLINE, aconf->host, NULL);
453
454 sendto_one_notice(source_p, ":X-Line for [%s] is removed", aconf->host);
455 sendto_realops_snomask(SNO_GENERAL, L_ALL,
456 "%s has removed the X-Line for: [%s]",
457 get_oper_name(source_p), aconf->host);
458 ilog(L_KLINE, "UX %s %s", get_oper_name(source_p), aconf->host);
5408b484
JT
459 }
460 else
461 {
8bbeb278 462 sendto_one_notice(source_p, ":X-Line for [%s] is removed", name);
5408b484 463 sendto_realops_snomask(SNO_GENERAL, L_ALL,
8bbeb278
AC
464 "%s has removed the temporary X-Line for: [%s]",
465 get_oper_name(source_p), name);
466 ilog(L_KLINE, "UX %s %s", get_oper_name(source_p), name);
5408b484 467 }
8bbeb278 468
23959371 469 remove_reject_mask(aconf->host, NULL);
212380e3 470 free_conf(aconf);
555ac41f 471 rb_dlinkDestroy(ptr, &xline_conf_list);
60c96e64 472 return;
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473 }
474 }
475
8bbeb278 476 sendto_one_notice(source_p, ":No X-Line for %s", name);
5408b484 477
60c96e64 478 return;
212380e3 479}