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11032584 | 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" | |
240bbd21 CP |
13 | #include "../lib/version.h" |
14 | ||
15 | MODULE_VERSION("") | |
11032584 | 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 dotcount=0; | |
73 | int notip=0; | |
74 | int foundwild=0; | |
75 | int foundslash=0; | |
76 | int i; | |
77 | int checklen; | |
78 | chanban *cbp; | |
281f454f | 79 | char tmpbuf[512]; |
11032584 | 80 | |
81 | cbp=getchanban(); | |
82 | len=strlen(mask); | |
83 | ||
84 | cbp->flags=0; | |
85 | ||
86 | /* Let's catch a silly case first */ | |
87 | if (!strcmp(mask,"*")) { | |
88 | cbp->flags=CHANBAN_HOSTANY | CHANBAN_USERANY | CHANBAN_NICKANY; | |
89 | cbp->nick=NULL; | |
90 | cbp->user=NULL; | |
91 | cbp->host=NULL; | |
92 | cbp->timeset=time(NULL); | |
93 | return cbp; | |
94 | } | |
95 | ||
96 | for (i=(len-1);i>=0;i--) { | |
97 | if (mask[i]=='@') { | |
98 | /* Got @ sign: everything after here is host */ | |
99 | if ((len-i)-1 > HOSTLEN) { | |
100 | /* This is too long, we need to truncate it */ | |
281f454f | 101 | strncpy(tmpbuf,&mask[len-HOSTLEN],HOSTLEN); |
102 | tmpbuf[HOSTLEN]='\0'; | |
103 | tmpbuf[0]='*'; | |
104 | cbp->host=getsstring(tmpbuf,HOSTLEN); | |
11032584 | 105 | cbp->flags |= CHANBAN_HOSTMASK; |
106 | } else if (i==(len-1)) { | |
107 | /* Ban ending with @, just mark it invalid */ | |
108 | /* Note that "moo@*" overrides "moo@", so mark it as having a host too */ | |
109 | cbp->flags |= (CHANBAN_INVALID | CHANBAN_HOSTNULL); | |
110 | cbp->host=NULL; | |
111 | } else if (i==(len-2) && mask[i+1]=='*') { | |
112 | /* Special case: "@*" */ | |
113 | cbp->flags |= CHANBAN_HOSTANY; | |
114 | cbp->host=NULL; | |
115 | } else if (foundslash) { | |
116 | /* If we found a slash (/), this can only be a CIDR ban */ | |
117 | /* However, it might be broken, so we need to retain the exact string | |
118 | * to track it accurately */ | |
119 | cbp->host=getsstring(&mask[i+1],HOSTLEN); | |
120 | if ((notip || dotcount!=3) && !foundwild) { | |
121 | cbp->flags |= (CHANBAN_INVALID | CHANBAN_HOSTEXACT); | |
e340eee8 | 122 | } else if (foundwild) { |
11032584 | 123 | cbp->flags |= (CHANBAN_INVALID | CHANBAN_HOSTMASK); |
e340eee8 | 124 | } else { |
125 | unsigned int a,b,c,d,l; | |
126 | /* CIDR bans have to match this pattern. */ | |
127 | if ((sscanf(&mask[i+1], "%u.%u.%u.%u/%u",&a,&b,&c,&d,&l) != 5) || | |
128 | (a>255) || (b>255) || (c>255) || (d>255) || (l>32) ) { | |
129 | cbp->flags |= (CHANBAN_HOSTEXACT | CHANBAN_INVALID); | |
130 | } else { | |
131 | /* Save the IP address and mask for later */ | |
132 | cbp->ipaddr=(a<<24)|(b<<16)|(c<<8)|d; | |
133 | cbp->mask=0xffffffff; | |
134 | if (l==0) { | |
135 | cbp->mask=0; | |
136 | } else if (l<32) { | |
137 | cbp->mask<<=(32-l); | |
138 | } | |
139 | /* pre-AND the IP with the mask here. */ | |
140 | cbp->ipaddr &= cbp->mask; | |
141 | cbp->flags |= (CHANBAN_HOSTEXACT | CHANBAN_CIDR); | |
142 | } | |
11032584 | 143 | } |
11032584 | 144 | } else { |
145 | /* We have some string with between 1 and HOSTLEN characters.. */ | |
146 | cbp->host=getsstring(&mask[i+1],HOSTLEN); | |
147 | if (foundwild) { | |
148 | /* We check all characters after the last wildcard (if any).. if they match | |
149 | * the corresponding bits of the hidden host string we mark it accordingly */ | |
150 | if (!(checklen=len-foundwild-1)) { /* Ban ends in *, mark it anyway.. */ | |
151 | cbp->flags |= CHANBAN_HIDDENHOST; | |
152 | } else { | |
153 | if (checklen>=strlen(HIS_HIDDENHOST)) { | |
154 | if (!ircd_strcmp(cbp->host->content+(cbp->host->length-strlen(HIS_HIDDENHOST)), HIS_HIDDENHOST)) | |
155 | cbp->flags |= CHANBAN_HIDDENHOST; | |
156 | } else { | |
157 | if (!ircd_strcmp(cbp->host->content+(cbp->host->length-checklen), | |
158 | (HIS_HIDDENHOST)+strlen(HIS_HIDDENHOST)-checklen)) | |
159 | cbp->flags |= CHANBAN_HIDDENHOST; | |
160 | } | |
161 | } | |
162 | cbp->flags |= CHANBAN_HOSTMASK; | |
163 | if (!notip && dotcount<=3) | |
164 | cbp->flags |= CHANBAN_IP; | |
165 | } else { | |
166 | /* Exact host: see if it ends with the "hidden host" string */ | |
167 | cbp->flags |= CHANBAN_HOSTEXACT; | |
168 | if ((cbp->host->length > (strlen(HIS_HIDDENHOST)+1)) && | |
e340eee8 | 169 | !ircd_strcmp(cbp->host->content+(cbp->host->length-strlen(HIS_HIDDENHOST)), HIS_HIDDENHOST)) { |
11032584 | 170 | cbp->flags |= CHANBAN_HIDDENHOST; |
e340eee8 | 171 | } else if (!notip && dotcount==3) { |
172 | unsigned int a,b,c,d; | |
173 | if ((sscanf(&mask[i+1], "%u.%u.%u.%u",&a,&b,&c,&d) != 4) || | |
174 | (a > 255) || (b > 255) || (c > 255) || (d > 255) ) { | |
175 | /* Something with only numbers and exactly 3 dots that isn't an IP address can't match anything. */ | |
176 | cbp->flags |= CHANBAN_INVALID; | |
177 | } else { | |
178 | cbp->ipaddr=(a<<24)|(b<<16)|(c<<8)|d; | |
179 | cbp->flags |= CHANBAN_IP; | |
180 | } | |
181 | } | |
11032584 | 182 | } |
183 | } | |
184 | foundat=i; | |
185 | break; | |
186 | } else if (mask[i]=='/') { | |
187 | foundslash=1; | |
188 | } else if (mask[i]=='.') { | |
189 | dotcount++; | |
190 | } else if (mask[i]=='?' || mask[i]=='*') { | |
191 | if (!foundwild) /* Mark last wildcard in string */ | |
192 | foundwild=i; | |
193 | } else if (mask[i]<'0' || mask[i]>'9') { | |
194 | notip=1; | |
195 | } | |
196 | } | |
197 | ||
198 | if (foundat<0) { | |
199 | /* If there wasn't an @, this ban matches any host */ | |
200 | cbp->host=NULL; | |
201 | cbp->flags |= CHANBAN_HOSTANY; | |
202 | } | |
203 | ||
204 | foundwild=0; | |
205 | ||
206 | for (i=0;i<foundat;i++) { | |
207 | if (mask[i]=='!') { | |
208 | if (i==0) { | |
209 | /* Invalid mask: nick is empty */ | |
210 | cbp->flags |= CHANBAN_NICKNULL; | |
211 | cbp->nick=NULL; | |
212 | } else if (i==1 && mask[0]=='*') { | |
213 | /* matches any nick */ | |
214 | cbp->flags |= CHANBAN_NICKANY; | |
215 | cbp->nick=NULL; | |
216 | } else { | |
217 | if (i>NICKLEN) { | |
218 | /* too long: just take the first NICKLEN chars */ | |
219 | cbp->nick=getsstring(mask,NICKLEN); | |
220 | } else { | |
221 | cbp->nick=getsstring(mask,i); | |
222 | } | |
223 | if (foundwild) | |
224 | cbp->flags |= CHANBAN_NICKMASK; | |
225 | else | |
226 | cbp->flags |= CHANBAN_NICKEXACT; | |
227 | } | |
228 | foundbang=i; | |
229 | break; | |
230 | } else if (mask[i]=='?' || mask[i]=='*') { | |
231 | if (i<NICKLEN) { | |
232 | foundwild=1; | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | if (foundbang<0) { | |
238 | /* We didn't find a !, what we do now depends on what happened | |
239 | * with the @ */ | |
240 | if (foundat<0) { | |
241 | /* A ban with no ! or @ is treated as a nick ban only */ | |
242 | /* Note that we've special-cased "*" at the top, so we can only | |
243 | * hit the MASK or EXACT case here. */ | |
244 | if (len>NICKLEN) | |
245 | cbp->nick=getsstring(mask,NICKLEN); | |
246 | else | |
247 | cbp->nick=getsstring(mask,len); | |
248 | ||
249 | if (foundwild) | |
250 | cbp->flags |= CHANBAN_NICKMASK; | |
251 | else | |
252 | cbp->flags |= CHANBAN_NICKEXACT; | |
253 | ||
254 | cbp->flags |= (CHANBAN_USERANY | CHANBAN_HOSTANY); | |
255 | cbp->host=NULL; | |
256 | cbp->user=NULL; | |
257 | } else { | |
258 | /* A ban with @ only is treated as user@host */ | |
259 | cbp->nick=NULL; | |
260 | cbp->flags |= CHANBAN_NICKANY; | |
261 | } | |
262 | } | |
263 | ||
264 | if (foundat>=0) { | |
265 | /* We found an @, so everything between foundbang+1 and foundat-1 is supposed to be ident */ | |
266 | /* This is true even if there was no !.. */ | |
267 | if (foundat==(foundbang+1)) { | |
268 | /* empty ident matches nothing */ | |
269 | cbp->flags |= (CHANBAN_INVALID | CHANBAN_USERNULL); | |
270 | cbp->user=NULL; | |
271 | } else if (foundat - foundbang - 1 > USERLEN) { | |
272 | /* It's too long.. */ | |
281f454f | 273 | strncpy(tmpbuf,&mask[foundat-USERLEN],USERLEN); |
274 | tmpbuf[USERLEN]='\0'; | |
275 | tmpbuf[0]='*'; | |
276 | cbp->user=getsstring(tmpbuf,USERLEN); | |
11032584 | 277 | cbp->flags |= CHANBAN_USERMASK; |
278 | } else if ((foundat - foundbang - 1 == 1) && mask[foundbang+1]=='*') { | |
279 | cbp->user=NULL; | |
280 | cbp->flags |= CHANBAN_USERANY; | |
281 | } else { | |
282 | cbp->user=getsstring(&mask[foundbang+1],(foundat-foundbang-1)); | |
283 | if (strchr(cbp->user->content,'*') || strchr(cbp->user->content,'?')) | |
284 | cbp->flags |= CHANBAN_USERMASK; | |
285 | else | |
286 | cbp->flags |= CHANBAN_USEREXACT; | |
287 | } | |
281f454f | 288 | /* Username part can't contain an @ */ |
289 | if (cbp->user && strchr(cbp->user->content,'@')) { | |
290 | cbp->flags |= CHANBAN_INVALID; | |
291 | } | |
11032584 | 292 | } |
293 | ||
294 | assert(cbp->flags & (CHANBAN_USEREXACT | CHANBAN_USERMASK | CHANBAN_USERANY | CHANBAN_USERNULL)); | |
295 | assert(cbp->flags & (CHANBAN_NICKEXACT | CHANBAN_NICKMASK | CHANBAN_NICKANY | CHANBAN_NICKNULL)); | |
296 | assert(cbp->flags & (CHANBAN_HOSTEXACT | CHANBAN_HOSTMASK | CHANBAN_HOSTANY | CHANBAN_HOSTNULL)); | |
297 | ||
298 | cbp->timeset=time(NULL); | |
299 | ||
e340eee8 | 300 | cbp->next=NULL; |
301 | ||
11032584 | 302 | return cbp; |
303 | } | |
304 | ||
305 | /* banoverlap: | |
306 | * Returns nonzero iff bana is a SUPERSET of banb | |
307 | */ | |
308 | ||
309 | int banoverlap(const chanban *bana, const chanban *banb) { | |
310 | /* This function works by looking for cases where bana DOESN'T overlap banb */ | |
311 | ||
312 | /* NICK section */ | |
313 | /* If bana has CHANBAN_NICKANY then it clearly overlaps | |
314 | * in the nick section so there are no checks */ | |
315 | ||
316 | if ((bana->flags & CHANBAN_NICKNULL) && !(banb->flags & CHANBAN_NICKNULL)) { | |
317 | return 0; | |
318 | } | |
319 | ||
320 | if (bana->flags & CHANBAN_NICKMASK) { | |
321 | if (banb->flags & (CHANBAN_NICKANY | CHANBAN_NICKNULL)) { | |
322 | return 0; | |
323 | } | |
324 | if ((banb->flags & CHANBAN_NICKMASK) && !match2patterns(bana->nick->content, banb->nick->content)) { | |
325 | return 0; | |
326 | } | |
327 | if ((banb->flags & CHANBAN_NICKEXACT) && !match2strings(bana->nick->content, banb->nick->content)) { | |
328 | return 0; | |
329 | } | |
330 | } | |
331 | ||
332 | if (bana->flags & CHANBAN_NICKEXACT) { | |
333 | if (banb->flags & (CHANBAN_NICKANY | CHANBAN_NICKMASK | CHANBAN_NICKNULL)) { | |
334 | return 0; | |
335 | } | |
336 | if ((!bana->nick && banb->nick) || (bana->nick && !banb->nick)) { | |
337 | return 0; | |
338 | } | |
339 | if (bana->nick && ircd_strcmp(bana->nick->content,banb->nick->content)) { | |
340 | return 0; | |
341 | } | |
342 | } | |
343 | ||
344 | /* USER section */ | |
345 | /* If bana has CHANBAN_USERANY then it clearly overlaps | |
346 | * in the user section so there are no checks */ | |
347 | ||
348 | if ((bana->flags & CHANBAN_USERNULL) && !(banb->flags & CHANBAN_USERNULL)) { | |
349 | return 0; | |
350 | } | |
351 | ||
352 | if (bana->flags & CHANBAN_USERMASK) { | |
353 | if (banb->flags & (CHANBAN_USERANY | CHANBAN_USERNULL)) { | |
354 | return 0; | |
355 | } | |
356 | if ((banb->flags & CHANBAN_USERMASK) && !match2patterns(bana->user->content, banb->user->content)) { | |
357 | return 0; | |
358 | } | |
359 | if ((banb->flags & CHANBAN_USEREXACT) && !match2strings(bana->user->content, banb->user->content)) { | |
360 | return 0; | |
361 | } | |
362 | } | |
363 | ||
364 | if (bana->flags & CHANBAN_USEREXACT) { | |
365 | if (banb->flags & (CHANBAN_USERANY | CHANBAN_USERMASK | CHANBAN_USERNULL)) { | |
366 | return 0; | |
367 | } | |
368 | if ((!bana->user && banb->user) || (bana->user && !banb->user)) { | |
369 | return 0; | |
370 | } | |
371 | if (bana->user && ircd_strcmp(bana->user->content,banb->user->content)) { | |
372 | return 0; | |
373 | } | |
374 | } | |
375 | ||
376 | /* HOST section */ | |
377 | /* If bana has CHANBAN_HOSTANY then it clearly overlaps | |
378 | * in the host section so there are no checks */ | |
379 | ||
380 | if ((bana->flags & CHANBAN_HOSTNULL) && !(banb->flags & CHANBAN_HOSTNULL)) { | |
381 | return 0; | |
382 | } | |
383 | ||
384 | if (bana->flags & CHANBAN_HOSTMASK) { | |
385 | if (banb->flags & (CHANBAN_HOSTANY | CHANBAN_HOSTNULL)) { | |
386 | return 0; | |
387 | } | |
388 | if ((banb->flags & CHANBAN_HOSTMASK) && !match2patterns(bana->host->content, banb->host->content)) { | |
389 | return 0; | |
390 | } | |
391 | if ((banb->flags & CHANBAN_HOSTEXACT) && !match2strings(bana->host->content, banb->host->content)) { | |
392 | return 0; | |
393 | } | |
394 | } | |
395 | ||
396 | if (bana->flags & CHANBAN_HOSTEXACT) { | |
397 | if (banb->flags & (CHANBAN_HOSTANY | CHANBAN_HOSTMASK | CHANBAN_HOSTNULL)) { | |
398 | return 0; | |
399 | } | |
400 | if ((!bana->host && banb->host) || (bana->host && !banb->host)) { | |
401 | return 0; | |
402 | } | |
403 | if (bana->host && ircd_strcmp(bana->host->content,banb->host->content)) { | |
404 | return 0; | |
405 | } | |
406 | } | |
407 | ||
408 | return 1; | |
409 | } | |
410 | ||
411 | /* | |
412 | * banequal: | |
413 | * Returns nonzero iff the bans are EXACTLY the same | |
414 | */ | |
415 | ||
416 | int banequal(chanban *bana, chanban *banb) { | |
417 | if (bana->flags != banb->flags) | |
418 | return 0; | |
419 | ||
420 | if ((!bana->nick && banb->nick) || (bana->nick && !banb->nick)) | |
421 | return 0; | |
422 | ||
423 | if (bana->nick && ircd_strcmp(bana->nick->content,banb->nick->content)) | |
424 | return 0; | |
425 | ||
426 | if ((!bana->user && banb->user) || (bana->user && !banb->user)) | |
427 | return 0; | |
428 | ||
429 | if (bana->user && ircd_strcmp(bana->user->content,banb->user->content)) | |
430 | return 0; | |
431 | ||
432 | if ((!bana->host && banb->host) || (bana->host && !banb->host)) | |
433 | return 0; | |
434 | ||
435 | if (bana->host && ircd_strcmp(bana->host->content,banb->host->content)) | |
436 | return 0; | |
437 | ||
438 | return 1; | |
439 | } | |
440 | ||
441 | /* | |
442 | * bantostring: | |
443 | * Convert the specified ban to a string | |
444 | */ | |
445 | ||
446 | char *bantostring(chanban *bp) { | |
447 | static char outstring[NICKLEN+USERLEN+HOSTLEN+5]; | |
448 | int strpos=0; | |
449 | ||
450 | if (bp->flags & CHANBAN_NICKANY) { | |
451 | strpos += sprintf(outstring+strpos,"*"); | |
452 | } else if (bp->nick) { | |
453 | strpos += sprintf(outstring+strpos,"%s",bp->nick->content); | |
454 | } | |
455 | ||
456 | strpos += sprintf(outstring+strpos,"!"); | |
457 | ||
458 | if (bp->flags & CHANBAN_USERANY) { | |
459 | strpos += sprintf(outstring+strpos,"*"); | |
460 | } else if (bp->user) { | |
461 | strpos += sprintf(outstring+strpos,"%s",bp->user->content); | |
462 | } | |
463 | ||
464 | strpos += sprintf(outstring+strpos,"@"); | |
465 | ||
466 | if (bp->flags & CHANBAN_HOSTANY) { | |
467 | strpos += sprintf(outstring+strpos,"*"); | |
468 | } else if (bp->host) { | |
469 | strpos += sprintf(outstring+strpos,"%s",bp->host->content); | |
470 | } | |
471 | ||
472 | return outstring; | |
473 | } | |
474 | ||
475 | /* | |
476 | * bantostringdebug: | |
477 | * Convert the specified ban to a string (debugging version) | |
478 | */ | |
479 | ||
480 | char *bantostringdebug(chanban *bp) { | |
481 | static char outstring[NICKLEN+USERLEN+HOSTLEN+5]; | |
482 | int strpos=0; | |
483 | ||
484 | strpos += sprintf(outstring+strpos, "flags=%04x ",bp->flags); | |
485 | ||
486 | if (bp->nick) { | |
487 | strpos += sprintf(outstring+strpos, "nick=%s ",bp->nick->content); | |
488 | } else { | |
489 | strpos += sprintf(outstring+strpos, "nonick "); | |
490 | } | |
491 | ||
492 | if (bp->user) { | |
493 | strpos += sprintf(outstring+strpos, "user=%s ",bp->user->content); | |
494 | } else { | |
495 | strpos += sprintf(outstring+strpos, "nouser "); | |
496 | } | |
497 | ||
498 | if (bp->host) { | |
499 | strpos += sprintf(outstring+strpos, "host=%s ",bp->host->content); | |
500 | } else { | |
501 | strpos += sprintf(outstring+strpos, "nohost "); | |
502 | } | |
503 | ||
504 | ||
505 | return outstring; | |
506 | } | |
507 |