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1 | /* channelbans.c */ | |
2 | ||
3 | #include <assert.h> | |
4 | #include <string.h> | |
5 | #include <stdio.h> | |
6 | #include "bans.h" | |
7 | ||
8 | #include "../nick/nick.h" | |
9 | #include "../lib/irc_string.h" | |
10 | #include "../irc/irc_config.h" | |
11 | #include "../core/nsmalloc.h" | |
12 | #include "../lib/flags.h" | |
13 | #include "../lib/version.h" | |
14 | ||
15 | MODULE_VERSION("") | |
16 | ||
17 | #define ALLOCUNIT 100 | |
18 | ||
19 | chanban *freebans; | |
20 | ||
21 | void _init() { | |
22 | freebans=NULL; | |
23 | } | |
24 | ||
25 | void _fini() { | |
26 | nsfreeall(POOL_BANS); | |
27 | } | |
28 | ||
29 | chanban *getchanban() { | |
30 | int i; | |
31 | chanban *cbp; | |
32 | ||
33 | if (freebans==NULL) { | |
34 | freebans=(chanban *)nsmalloc(POOL_BANS, ALLOCUNIT*sizeof(chanban)); | |
35 | for (i=0;i<ALLOCUNIT-1;i++) { | |
36 | freebans[i].next=(struct chanban *)&(freebans[i+1]); | |
37 | } | |
38 | freebans[ALLOCUNIT-1].next=NULL; | |
39 | } | |
40 | ||
41 | cbp=freebans; | |
42 | freebans=cbp->next; | |
43 | ||
44 | cbp->nick=NULL; | |
45 | cbp->user=NULL; | |
46 | cbp->host=NULL; | |
47 | ||
48 | return cbp; | |
49 | } | |
50 | ||
51 | void freechanban(chanban *cbp) { | |
52 | cbp->next=(struct chanban *)freebans; | |
53 | ||
54 | if (cbp->nick) | |
55 | freesstring(cbp->nick); | |
56 | if (cbp->user) | |
57 | freesstring(cbp->user); | |
58 | if (cbp->host) | |
59 | freesstring(cbp->host); | |
60 | ||
61 | freebans=cbp; | |
62 | } | |
63 | ||
64 | /* | |
65 | * makeban: | |
66 | * Converts the specified ban into a ban structure | |
67 | */ | |
68 | ||
69 | chanban *makeban(const char *mask) { | |
70 | int len; | |
71 | int foundat=-1,foundbang=-1; | |
72 | int foundwild=0; | |
73 | int i; | |
74 | int checklen; | |
75 | chanban *cbp; | |
76 | char tmpbuf[512]; | |
77 | ||
78 | cbp=getchanban(); | |
79 | len=strlen(mask); | |
80 | ||
81 | cbp->flags=0; | |
82 | ||
83 | /* Let's catch a silly case first */ | |
84 | if (!strcmp(mask,"*")) { | |
85 | cbp->flags=CHANBAN_HOSTANY | CHANBAN_USERANY | CHANBAN_NICKANY; | |
86 | cbp->nick=NULL; | |
87 | cbp->user=NULL; | |
88 | cbp->host=NULL; | |
89 | cbp->timeset=time(NULL); | |
90 | return cbp; | |
91 | } | |
92 | ||
93 | for (i=(len-1);i>=0;i--) { | |
94 | if (mask[i]=='@') { | |
95 | /* Got @ sign: everything after here is host */ | |
96 | if ((len-i)-1 > HOSTLEN) { | |
97 | /* This is too long, we need to truncate it */ | |
98 | strncpy(tmpbuf,&mask[len-HOSTLEN],HOSTLEN); | |
99 | tmpbuf[HOSTLEN]='\0'; | |
100 | tmpbuf[0]='*'; | |
101 | cbp->host=getsstring(tmpbuf,HOSTLEN); | |
102 | cbp->flags |= CHANBAN_HOSTMASK; | |
103 | } else if (i==(len-1)) { | |
104 | /* Ban ending with @, just mark it invalid */ | |
105 | /* Note that "moo@*" overrides "moo@", so mark it as having a host too */ | |
106 | cbp->flags |= (CHANBAN_INVALID | CHANBAN_HOSTNULL); | |
107 | cbp->host=NULL; | |
108 | } else if (i==(len-2) && mask[i+1]=='*') { | |
109 | /* Special case: "@*" */ | |
110 | cbp->flags |= CHANBAN_HOSTANY; | |
111 | cbp->host=NULL; | |
112 | } else { | |
113 | /* We have some string with between 1 and HOSTLEN characters.. */ | |
114 | cbp->host=getsstring(&mask[i+1],HOSTLEN); | |
115 | ||
116 | /* If it matches an IP address, flag it as such */ | |
117 | if (ipmask_parse(cbp->host->content, &(cbp->ipaddr), &(cbp->prefixlen))) { | |
118 | cbp->flags |= CHANBAN_IP; | |
119 | } | |
120 | ||
121 | if (foundwild) { | |
122 | /* We check all characters after the last wildcard (if any).. if they match | |
123 | * the corresponding bits of the hidden host string we mark it accordingly */ | |
124 | if (!(checklen=len-foundwild-1)) { /* Ban ends in *, mark it anyway.. */ | |
125 | cbp->flags |= CHANBAN_HIDDENHOST; | |
126 | } else { | |
127 | if (checklen>=strlen(HIS_HIDDENHOST)) { | |
128 | if (!ircd_strcmp(cbp->host->content+(cbp->host->length-strlen(HIS_HIDDENHOST)), HIS_HIDDENHOST)) | |
129 | cbp->flags |= CHANBAN_HIDDENHOST; | |
130 | } else { | |
131 | if (!ircd_strcmp(cbp->host->content+(cbp->host->length-checklen), | |
132 | (HIS_HIDDENHOST)+strlen(HIS_HIDDENHOST)-checklen)) | |
133 | cbp->flags |= CHANBAN_HIDDENHOST; | |
134 | } | |
135 | } | |
136 | cbp->flags |= CHANBAN_HOSTMASK; | |
137 | } else { | |
138 | /* Exact host: see if it ends with the "hidden host" string */ | |
139 | cbp->flags |= CHANBAN_HOSTEXACT; | |
140 | if ((cbp->host->length > (strlen(HIS_HIDDENHOST)+1)) && | |
141 | !ircd_strcmp(cbp->host->content+(cbp->host->length-strlen(HIS_HIDDENHOST)), HIS_HIDDENHOST)) { | |
142 | cbp->flags |= CHANBAN_HIDDENHOST; | |
143 | } | |
144 | } | |
145 | } | |
146 | foundat=i; | |
147 | break; | |
148 | } else if (mask[i]=='?' || mask[i]=='*') { | |
149 | if (!foundwild) /* Mark last wildcard in string */ | |
150 | foundwild=i; | |
151 | } | |
152 | } | |
153 | ||
154 | if (foundat<0) { | |
155 | /* If there wasn't an @, this ban matches any host */ | |
156 | cbp->host=NULL; | |
157 | cbp->flags |= CHANBAN_HOSTANY; | |
158 | } | |
159 | ||
160 | foundwild=0; | |
161 | ||
162 | for (i=0;i<foundat;i++) { | |
163 | if (mask[i]=='!') { | |
164 | if (i==0) { | |
165 | /* Invalid mask: nick is empty */ | |
166 | cbp->flags |= CHANBAN_NICKNULL; | |
167 | cbp->nick=NULL; | |
168 | } else if (i==1 && mask[0]=='*') { | |
169 | /* matches any nick */ | |
170 | cbp->flags |= CHANBAN_NICKANY; | |
171 | cbp->nick=NULL; | |
172 | } else { | |
173 | if (i>NICKLEN) { | |
174 | /* too long: just take the first NICKLEN chars */ | |
175 | cbp->nick=getsstring(mask,NICKLEN); | |
176 | } else { | |
177 | cbp->nick=getsstring(mask,i); | |
178 | } | |
179 | if (foundwild) | |
180 | cbp->flags |= CHANBAN_NICKMASK; | |
181 | else | |
182 | cbp->flags |= CHANBAN_NICKEXACT; | |
183 | } | |
184 | foundbang=i; | |
185 | break; | |
186 | } else if (mask[i]=='?' || mask[i]=='*') { | |
187 | if (i<NICKLEN) { | |
188 | foundwild=1; | |
189 | } | |
190 | } | |
191 | } | |
192 | ||
193 | if (foundbang<0) { | |
194 | /* We didn't find a !, what we do now depends on what happened | |
195 | * with the @ */ | |
196 | if (foundat<0) { | |
197 | /* A ban with no ! or @ is treated as a nick ban only */ | |
198 | /* Note that we've special-cased "*" at the top, so we can only | |
199 | * hit the MASK or EXACT case here. */ | |
200 | if (len>NICKLEN) | |
201 | cbp->nick=getsstring(mask,NICKLEN); | |
202 | else | |
203 | cbp->nick=getsstring(mask,len); | |
204 | ||
205 | if (foundwild) | |
206 | cbp->flags |= CHANBAN_NICKMASK; | |
207 | else | |
208 | cbp->flags |= CHANBAN_NICKEXACT; | |
209 | ||
210 | cbp->flags |= (CHANBAN_USERANY | CHANBAN_HOSTANY); | |
211 | cbp->host=NULL; | |
212 | cbp->user=NULL; | |
213 | } else { | |
214 | /* A ban with @ only is treated as user@host */ | |
215 | cbp->nick=NULL; | |
216 | cbp->flags |= CHANBAN_NICKANY; | |
217 | } | |
218 | } | |
219 | ||
220 | if (foundat>=0) { | |
221 | /* We found an @, so everything between foundbang+1 and foundat-1 is supposed to be ident */ | |
222 | /* This is true even if there was no !.. */ | |
223 | if (foundat==(foundbang+1)) { | |
224 | /* empty ident matches nothing */ | |
225 | cbp->flags |= (CHANBAN_INVALID | CHANBAN_USERNULL); | |
226 | cbp->user=NULL; | |
227 | } else if (foundat - foundbang - 1 > USERLEN) { | |
228 | /* It's too long.. */ | |
229 | strncpy(tmpbuf,&mask[foundat-USERLEN],USERLEN); | |
230 | tmpbuf[USERLEN]='\0'; | |
231 | tmpbuf[0]='*'; | |
232 | cbp->user=getsstring(tmpbuf,USERLEN); | |
233 | cbp->flags |= CHANBAN_USERMASK; | |
234 | } else if ((foundat - foundbang - 1 == 1) && mask[foundbang+1]=='*') { | |
235 | cbp->user=NULL; | |
236 | cbp->flags |= CHANBAN_USERANY; | |
237 | } else { | |
238 | cbp->user=getsstring(&mask[foundbang+1],(foundat-foundbang-1)); | |
239 | if (strchr(cbp->user->content,'*') || strchr(cbp->user->content,'?')) | |
240 | cbp->flags |= CHANBAN_USERMASK; | |
241 | else | |
242 | cbp->flags |= CHANBAN_USEREXACT; | |
243 | } | |
244 | /* Username part can't contain an @ */ | |
245 | if (cbp->user && strchr(cbp->user->content,'@')) { | |
246 | cbp->flags |= CHANBAN_INVALID; | |
247 | } | |
248 | } | |
249 | ||
250 | assert(cbp->flags & (CHANBAN_USEREXACT | CHANBAN_USERMASK | CHANBAN_USERANY | CHANBAN_USERNULL)); | |
251 | assert(cbp->flags & (CHANBAN_NICKEXACT | CHANBAN_NICKMASK | CHANBAN_NICKANY | CHANBAN_NICKNULL)); | |
252 | assert(cbp->flags & (CHANBAN_HOSTEXACT | CHANBAN_HOSTMASK | CHANBAN_HOSTANY | CHANBAN_HOSTNULL)); | |
253 | ||
254 | cbp->timeset=time(NULL); | |
255 | ||
256 | cbp->next=NULL; | |
257 | ||
258 | return cbp; | |
259 | } | |
260 | ||
261 | /* banoverlap: | |
262 | * Returns nonzero iff bana is a SUPERSET of banb | |
263 | */ | |
264 | ||
265 | int banoverlap(const chanban *bana, const chanban *banb) { | |
266 | /* This function works by looking for cases where bana DOESN'T overlap banb */ | |
267 | ||
268 | /* NICK section */ | |
269 | /* If bana has CHANBAN_NICKANY then it clearly overlaps | |
270 | * in the nick section so there are no checks */ | |
271 | ||
272 | if ((bana->flags & CHANBAN_NICKNULL) && !(banb->flags & CHANBAN_NICKNULL)) { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | if (bana->flags & CHANBAN_NICKMASK) { | |
277 | if (banb->flags & (CHANBAN_NICKANY | CHANBAN_NICKNULL)) { | |
278 | return 0; | |
279 | } | |
280 | if ((banb->flags & CHANBAN_NICKMASK) && !match2patterns(bana->nick->content, banb->nick->content)) { | |
281 | return 0; | |
282 | } | |
283 | if ((banb->flags & CHANBAN_NICKEXACT) && !match2strings(bana->nick->content, banb->nick->content)) { | |
284 | return 0; | |
285 | } | |
286 | } | |
287 | ||
288 | if (bana->flags & CHANBAN_NICKEXACT) { | |
289 | if (banb->flags & (CHANBAN_NICKANY | CHANBAN_NICKMASK | CHANBAN_NICKNULL)) { | |
290 | return 0; | |
291 | } | |
292 | if ((!bana->nick && banb->nick) || (bana->nick && !banb->nick)) { | |
293 | return 0; | |
294 | } | |
295 | if (bana->nick && ircd_strcmp(bana->nick->content,banb->nick->content)) { | |
296 | return 0; | |
297 | } | |
298 | } | |
299 | ||
300 | /* USER section */ | |
301 | /* If bana has CHANBAN_USERANY then it clearly overlaps | |
302 | * in the user section so there are no checks */ | |
303 | ||
304 | if ((bana->flags & CHANBAN_USERNULL) && !(banb->flags & CHANBAN_USERNULL)) { | |
305 | return 0; | |
306 | } | |
307 | ||
308 | if (bana->flags & CHANBAN_USERMASK) { | |
309 | if (banb->flags & (CHANBAN_USERANY | CHANBAN_USERNULL)) { | |
310 | return 0; | |
311 | } | |
312 | if ((banb->flags & CHANBAN_USERMASK) && !match2patterns(bana->user->content, banb->user->content)) { | |
313 | return 0; | |
314 | } | |
315 | if ((banb->flags & CHANBAN_USEREXACT) && !match2strings(bana->user->content, banb->user->content)) { | |
316 | return 0; | |
317 | } | |
318 | } | |
319 | ||
320 | if (bana->flags & CHANBAN_USEREXACT) { | |
321 | if (banb->flags & (CHANBAN_USERANY | CHANBAN_USERMASK | CHANBAN_USERNULL)) { | |
322 | return 0; | |
323 | } | |
324 | if ((!bana->user && banb->user) || (bana->user && !banb->user)) { | |
325 | return 0; | |
326 | } | |
327 | if (bana->user && ircd_strcmp(bana->user->content,banb->user->content)) { | |
328 | return 0; | |
329 | } | |
330 | } | |
331 | ||
332 | /* HOST section */ | |
333 | /* If bana has CHANBAN_HOSTANY then it clearly overlaps | |
334 | * in the host section so there are no checks */ | |
335 | ||
336 | if ((bana->flags & CHANBAN_HOSTNULL) && !(banb->flags & CHANBAN_HOSTNULL)) { | |
337 | return 0; | |
338 | } | |
339 | ||
340 | if (bana->flags & CHANBAN_HOSTMASK) { | |
341 | if (banb->flags & (CHANBAN_HOSTANY | CHANBAN_HOSTNULL)) { | |
342 | return 0; | |
343 | } | |
344 | if ((banb->flags & CHANBAN_HOSTMASK) && !match2patterns(bana->host->content, banb->host->content)) { | |
345 | return 0; | |
346 | } | |
347 | if ((banb->flags & CHANBAN_HOSTEXACT) && !match2strings(bana->host->content, banb->host->content)) { | |
348 | return 0; | |
349 | } | |
350 | } | |
351 | ||
352 | if (bana->flags & CHANBAN_HOSTEXACT) { | |
353 | if (banb->flags & (CHANBAN_HOSTANY | CHANBAN_HOSTMASK | CHANBAN_HOSTNULL)) { | |
354 | return 0; | |
355 | } | |
356 | if ((!bana->host && banb->host) || (bana->host && !banb->host)) { | |
357 | return 0; | |
358 | } | |
359 | if (bana->host && ircd_strcmp(bana->host->content,banb->host->content)) { | |
360 | return 0; | |
361 | } | |
362 | } | |
363 | ||
364 | return 1; | |
365 | } | |
366 | ||
367 | /* | |
368 | * banequal: | |
369 | * Returns nonzero iff the bans are EXACTLY the same | |
370 | */ | |
371 | ||
372 | int banequal(chanban *bana, chanban *banb) { | |
373 | if (bana->flags != banb->flags) | |
374 | return 0; | |
375 | ||
376 | if ((!bana->nick && banb->nick) || (bana->nick && !banb->nick)) | |
377 | return 0; | |
378 | ||
379 | if (bana->nick && ircd_strcmp(bana->nick->content,banb->nick->content)) | |
380 | return 0; | |
381 | ||
382 | if ((!bana->user && banb->user) || (bana->user && !banb->user)) | |
383 | return 0; | |
384 | ||
385 | if (bana->user && ircd_strcmp(bana->user->content,banb->user->content)) | |
386 | return 0; | |
387 | ||
388 | if ((!bana->host && banb->host) || (bana->host && !banb->host)) | |
389 | return 0; | |
390 | ||
391 | if (bana->host && ircd_strcmp(bana->host->content,banb->host->content)) | |
392 | return 0; | |
393 | ||
394 | return 1; | |
395 | } | |
396 | ||
397 | /* | |
398 | * bantostring: | |
399 | * Convert the specified ban to a string | |
400 | */ | |
401 | ||
402 | char *bantostring(chanban *bp) { | |
403 | static char outstring[NICKLEN+USERLEN+HOSTLEN+5]; | |
404 | int strpos=0; | |
405 | ||
406 | if (bp->flags & CHANBAN_NICKANY) { | |
407 | strpos += sprintf(outstring+strpos,"*"); | |
408 | } else if (bp->nick) { | |
409 | strpos += sprintf(outstring+strpos,"%s",bp->nick->content); | |
410 | } | |
411 | ||
412 | strpos += sprintf(outstring+strpos,"!"); | |
413 | ||
414 | if (bp->flags & CHANBAN_USERANY) { | |
415 | strpos += sprintf(outstring+strpos,"*"); | |
416 | } else if (bp->user) { | |
417 | strpos += sprintf(outstring+strpos,"%s",bp->user->content); | |
418 | } | |
419 | ||
420 | strpos += sprintf(outstring+strpos,"@"); | |
421 | ||
422 | if (bp->flags & CHANBAN_HOSTANY) { | |
423 | strpos += sprintf(outstring+strpos,"*"); | |
424 | } else if (bp->host) { | |
425 | strpos += sprintf(outstring+strpos,"%s",bp->host->content); | |
426 | } | |
427 | ||
428 | return outstring; | |
429 | } | |
430 | ||
431 | /* | |
432 | * bantostringdebug: | |
433 | * Convert the specified ban to a string (debugging version) | |
434 | */ | |
435 | ||
436 | char *bantostringdebug(chanban *bp) { | |
437 | static char outstring[NICKLEN+USERLEN+HOSTLEN+5]; | |
438 | int strpos=0; | |
439 | ||
440 | strpos += sprintf(outstring+strpos, "flags=%04x ",bp->flags); | |
441 | ||
442 | if (bp->nick) { | |
443 | strpos += sprintf(outstring+strpos, "nick=%s ",bp->nick->content); | |
444 | } else { | |
445 | strpos += sprintf(outstring+strpos, "nonick "); | |
446 | } | |
447 | ||
448 | if (bp->user) { | |
449 | strpos += sprintf(outstring+strpos, "user=%s ",bp->user->content); | |
450 | } else { | |
451 | strpos += sprintf(outstring+strpos, "nouser "); | |
452 | } | |
453 | ||
454 | if (bp->host) { | |
455 | strpos += sprintf(outstring+strpos, "host=%s ",bp->host->content); | |
456 | } else { | |
457 | strpos += sprintf(outstring+strpos, "nohost "); | |
458 | } | |
459 | ||
460 | ||
461 | return outstring; | |
462 | } | |
463 |