]>
jfr.im git - solanum.git/blob - src/hostmask.c
2 * charybdis: an advanced internet relay chat daemon (ircd).
3 * hostmask.c: Code to efficiently find IP & hostmask based configs.
5 * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
6 * Copyright (C) 1996-2002 Hybrid Development Team
7 * Copyright (C) 2002-2005 ircd-ratbox development team
8 * Copyright (C) 2005-2008 charybdis development team
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
25 * $Id: hostmask.c 2757 2006-11-10 22:58:15Z jilles $
29 #include "ircd_defs.h"
34 #include "irc_string.h"
37 static unsigned long hash_ipv6(struct sockaddr
*, int);
39 static unsigned long hash_ipv4(struct sockaddr
*, int);
42 /* int parse_netmask(const char *, struct rb_sockaddr_storage *, int *);
43 * Input: A hostmask, or an IPV4/6 address.
44 * Output: An integer describing whether it is an IPV4, IPV6 address or a
45 * hostmask, an address(if it is an IP mask),
46 * a bitlength(if it is IP mask).
50 parse_netmask(const char *text
, struct sockaddr
*naddr
, int *nb
)
52 char *ip
= LOCAL_COPY(text
);
54 struct rb_sockaddr_storage
*addr
, xaddr
;
62 addr
= (struct rb_sockaddr_storage
*)&xaddr
;
64 addr
= (struct rb_sockaddr_storage
*)naddr
;
69 if((ptr
= strchr(ip
, '/')))
78 if(inetpton_sock(ip
, (struct sockaddr
*)addr
) > 0)
86 if((ptr
= strchr(ip
, '/')))
95 if(inetpton_sock(ip
, (struct sockaddr
*)addr
) > 0)
103 /* Hashtable stuff...now external as its used in m_stats.c */
104 struct AddressRec
*atable
[ATABLE_SIZE
];
109 memset(&atable
, 0, sizeof(atable
));
112 /* unsigned long hash_ipv4(struct rb_sockaddr_storage*)
113 * Input: An IP address.
114 * Output: A hash value of the IP address.
118 hash_ipv4(struct sockaddr
*saddr
, int bits
)
120 struct sockaddr_in
*addr
= (struct sockaddr_in
*) saddr
;
124 unsigned long av
= ntohl(addr
->sin_addr
.s_addr
) & ~((1 << (32 - bits
)) - 1);
125 return (av
^ (av
>> 12) ^ (av
>> 24)) & (ATABLE_SIZE
- 1);
131 /* unsigned long hash_ipv6(struct rb_sockaddr_storage*)
132 * Input: An IP address.
133 * Output: A hash value of the IP address.
138 hash_ipv6(struct sockaddr
*saddr
, int bits
)
140 struct sockaddr_in6
*addr
= (struct sockaddr_in6
*) saddr
;
141 unsigned long v
= 0, n
;
142 for (n
= 0; n
< 16; n
++)
146 v
^= addr
->sin6_addr
.s6_addr
[n
];
151 v
^= addr
->sin6_addr
.s6_addr
[n
] & ~((1 << (8 - bits
)) - 1);
152 return v
& (ATABLE_SIZE
- 1);
155 return v
& (ATABLE_SIZE
- 1);
157 return v
& (ATABLE_SIZE
- 1);
161 /* int hash_text(const char *start)
162 * Input: The start of the text to hash.
163 * Output: The hash of the string between 1 and (TH_MAX-1)
164 * Side-effects: None.
167 hash_text(const char *start
)
169 const char *p
= start
;
174 h
= (h
<< 4) - (h
+ (unsigned char) ToLower(*p
++));
177 return (h
& (ATABLE_SIZE
- 1));
180 /* unsigned long get_hash_mask(const char *)
181 * Input: The text to hash.
182 * Output: The hash of the string right of the first '.' past the last
183 * wildcard in the string.
184 * Side-effects: None.
187 get_mask_hash(const char *text
)
189 const char *hp
= "", *p
;
191 for (p
= text
+ strlen(text
) - 1; p
>= text
; p
--)
192 if(*p
== '*' || *p
== '?')
193 return hash_text(hp
);
196 return hash_text(text
);
199 /* struct ConfItem* find_conf_by_address(const char*, struct rb_sockaddr_storage*,
200 * int type, int fam, const char *username)
201 * Input: The hostname, the address, the type of mask to find, the address
202 * family, the username.
203 * Output: The matching value with the highest precedence.
205 * Note: Setting bit 0 of the type means that the username is ignored.
208 find_conf_by_address(const char *name
, const char *sockhost
,
209 const char *orighost
,
210 struct sockaddr
*addr
, int type
, int fam
,
211 const char *username
)
213 unsigned long hprecv
= 0;
214 struct ConfItem
*hprec
= NULL
;
215 struct AddressRec
*arec
;
223 /* Check for IPV6 matches... */
228 for (b
= 128; b
>= 0; b
-= 16)
230 for (arec
= atable
[hash_ipv6(addr
, b
)]; arec
; arec
= arec
->next
)
231 if(arec
->type
== (type
& ~0x1) &&
232 arec
->masktype
== HM_IPV6
&&
233 comp_with_mask_sock(addr
, (struct sockaddr
*)&arec
->Mask
.ipa
.addr
,
234 arec
->Mask
.ipa
.bits
) && (type
& 0x1
239 && arec
->precedence
> hprecv
)
241 hprecv
= arec
->precedence
;
250 for (b
= 32; b
>= 0; b
-= 8)
252 for (arec
= atable
[hash_ipv4(addr
, b
)]; arec
; arec
= arec
->next
)
253 if(arec
->type
== (type
& ~0x1) &&
254 arec
->masktype
== HM_IPV4
&&
255 arec
->precedence
> hprecv
&&
256 comp_with_mask_sock(addr
, (struct sockaddr
*)&arec
->Mask
.ipa
.addr
,
257 arec
->Mask
.ipa
.bits
) &&
258 (type
& 0x1 || match(arec
->username
, username
)))
260 hprecv
= arec
->precedence
;
271 for (p
= orighost
; p
!= NULL
;)
273 for (arec
= atable
[hash_text(p
)]; arec
; arec
= arec
->next
)
275 if((arec
->type
== (type
& ~0x1)) &&
276 (arec
->masktype
== HM_HOST
) &&
277 arec
->precedence
> hprecv
&&
278 match(arec
->Mask
.hostname
, orighost
) &&
279 (type
& 0x1 || match(arec
->username
, username
)))
281 hprecv
= arec
->precedence
;
290 for (arec
= atable
[0]; arec
; arec
= arec
->next
)
292 if(arec
->type
== (type
& ~0x1) &&
293 arec
->masktype
== HM_HOST
&&
294 arec
->precedence
> hprecv
&&
295 (match(arec
->Mask
.hostname
, orighost
) ||
296 (sockhost
&& match(arec
->Mask
.hostname
, sockhost
))) &&
297 (type
& 0x1 || match(arec
->username
, username
)))
299 hprecv
= arec
->precedence
;
308 /* And yes - we have to check p after strchr and p after increment for
310 for (p
= name
; p
!= NULL
;)
312 for (arec
= atable
[hash_text(p
)]; arec
; arec
= arec
->next
)
313 if((arec
->type
== (type
& ~0x1)) &&
314 (arec
->masktype
== HM_HOST
) &&
315 arec
->precedence
> hprecv
&&
316 match(arec
->Mask
.hostname
, name
) &&
317 (type
& 0x1 || match(arec
->username
, username
)))
319 hprecv
= arec
->precedence
;
328 for (arec
= atable
[0]; arec
; arec
= arec
->next
)
330 if(arec
->type
== (type
& ~0x1) &&
331 arec
->masktype
== HM_HOST
&&
332 arec
->precedence
> hprecv
&&
333 (match(arec
->Mask
.hostname
, name
) ||
334 (sockhost
&& match(arec
->Mask
.hostname
, sockhost
))) &&
335 (type
& 0x1 || match(arec
->username
, username
)))
337 hprecv
= arec
->precedence
;
345 /* struct ConfItem* find_address_conf(const char*, const char*,
346 * struct rb_sockaddr_storage*, int);
347 * Input: The hostname, username, address, address family.
348 * Output: The applicable ConfItem.
352 find_address_conf(const char *host
, const char *sockhost
, const char *user
,
353 const char *notildeuser
, struct sockaddr
*ip
, int aftype
)
355 struct ConfItem
*iconf
, *kconf
;
358 /* Find the best I-line... If none, return NULL -A1kmm */
359 if(!(iconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_CLIENT
, aftype
, user
)))
361 /* Find what their visible username will be.
362 * Note that the username without tilde may contain one char more.
364 vuser
= IsNoTilde(iconf
) ? notildeuser
: user
;
366 /* If they are exempt from K-lines, return the best I-line. -A1kmm */
367 if(IsConfExemptKline(iconf
))
370 /* Find the best K-line... -A1kmm */
371 kconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_KILL
, aftype
, user
);
373 /* If they are K-lined, return the K-line */
377 /* if theres a spoof, check it against klines.. */
378 if(IsConfDoSpoofIp(iconf
))
380 char *p
= strchr(iconf
->name
, '@');
382 /* note, we dont need to pass sockhost here, as its
383 * guaranteed to not match by whats above.. --anfl
388 kconf
= find_conf_by_address(p
+1, NULL
, NULL
, ip
, CONF_KILL
, aftype
, iconf
->name
);
392 kconf
= find_conf_by_address(iconf
->name
, NULL
, NULL
, ip
, CONF_KILL
, aftype
, vuser
);
398 /* if no_tilde, check the username without tilde against klines too
402 kconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_KILL
, aftype
, vuser
);
410 /* struct ConfItem* find_dline(struct rb_sockaddr_storage*, int)
411 * Input: An address, an address family.
412 * Output: The best matching D-line or exempt line.
413 * Side effects: None.
416 find_dline(struct sockaddr
*addr
, int aftype
)
418 struct ConfItem
*eline
;
419 eline
= find_conf_by_address(NULL
, NULL
, NULL
, addr
, CONF_EXEMPTDLINE
| 1, aftype
, NULL
);
422 return find_conf_by_address(NULL
, NULL
, NULL
, addr
, CONF_DLINE
| 1, aftype
, NULL
);
425 /* void find_exact_conf_by_address(const char*, int, const char *)
427 * Output: ConfItem if found
431 find_exact_conf_by_address(const char *address
, int type
, const char *username
)
435 struct AddressRec
*arec
;
436 struct rb_sockaddr_storage addr
;
439 address
= "/NOMATCH!/";
440 arec
= rb_malloc(sizeof(struct AddressRec
));
441 masktype
= parse_netmask(address
, (struct sockaddr
*)&addr
, &bits
);
443 if(masktype
== HM_IPV6
)
445 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
446 hv
= hash_ipv6((struct sockaddr
*)&addr
, bits
- bits
% 16);
450 if(masktype
== HM_IPV4
)
452 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
453 hv
= hash_ipv4((struct sockaddr
*)&addr
, bits
- bits
% 8);
457 hv
= get_mask_hash(address
);
459 for (arec
= atable
[hv
]; arec
; arec
= arec
->next
)
461 if (arec
->type
== type
&&
462 arec
->masktype
== masktype
&&
463 (arec
->username
== NULL
|| username
== NULL
? arec
->username
== username
: !irccmp(arec
->username
, username
)))
465 if (masktype
== HM_HOST
)
467 if (!irccmp(arec
->Mask
.hostname
, address
))
472 if (arec
->Mask
.ipa
.bits
== bits
&&
473 comp_with_mask_sock((struct sockaddr
*)&arec
->Mask
.ipa
.addr
, (struct sockaddr
*)&addr
, bits
))
481 /* void add_conf_by_address(const char*, int, const char *,
482 * struct ConfItem *aconf)
485 * Side-effects: Adds this entry to the hash table.
488 add_conf_by_address(const char *address
, int type
, const char *username
, struct ConfItem
*aconf
)
490 static unsigned long prec_value
= 0xFFFFFFFF;
493 struct AddressRec
*arec
;
496 address
= "/NOMATCH!/";
497 arec
= rb_malloc(sizeof(struct AddressRec
));
498 masktype
= parse_netmask(address
, (struct sockaddr
*)&arec
->Mask
.ipa
.addr
, &bits
);
499 arec
->Mask
.ipa
.bits
= bits
;
500 arec
->masktype
= masktype
;
502 if(masktype
== HM_IPV6
)
504 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
506 arec
->next
= atable
[(hv
= hash_ipv6((struct sockaddr
*)&arec
->Mask
.ipa
.addr
, bits
))];
511 if(masktype
== HM_IPV4
)
513 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
515 arec
->next
= atable
[(hv
= hash_ipv4((struct sockaddr
*)&arec
->Mask
.ipa
.addr
, bits
))];
520 arec
->Mask
.hostname
= address
;
521 arec
->next
= atable
[(hv
= get_mask_hash(address
))];
524 arec
->username
= username
;
526 arec
->precedence
= prec_value
--;
530 /* void delete_one_address(const char*, struct ConfItem*)
531 * Input: An address string, the associated ConfItem.
533 * Side effects: Deletes an address record. Frees the ConfItem if there
534 * is nothing referencing it, sets it as illegal otherwise.
537 delete_one_address_conf(const char *address
, struct ConfItem
*aconf
)
541 struct AddressRec
*arec
, *arecl
= NULL
;
542 struct rb_sockaddr_storage addr
;
543 masktype
= parse_netmask(address
, (struct sockaddr
*)&addr
, &bits
);
545 if(masktype
== HM_IPV6
)
547 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
549 hv
= hash_ipv6((struct sockaddr
*)&addr
, bits
);
553 if(masktype
== HM_IPV4
)
555 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
557 hv
= hash_ipv4((struct sockaddr
*)&addr
, bits
);
560 hv
= get_mask_hash(address
);
561 for (arec
= atable
[hv
]; arec
; arec
= arec
->next
)
563 if(arec
->aconf
== aconf
)
566 arecl
->next
= arec
->next
;
568 atable
[hv
] = arec
->next
;
569 aconf
->status
|= CONF_ILLEGAL
;
579 /* void clear_out_address_conf(void)
582 * Side effects: Clears out all address records in the hash table,
583 * frees them, and frees the ConfItems if nothing references
584 * them, otherwise sets them as illegal.
587 clear_out_address_conf(void)
590 struct AddressRec
**store_next
;
591 struct AddressRec
*arec
, *arecn
;
593 for (i
= 0; i
< ATABLE_SIZE
; i
++)
595 store_next
= &atable
[i
];
596 for (arec
= atable
[i
]; arec
; arec
= arecn
)
599 /* We keep the temporary K-lines and destroy the
600 * permanent ones, just to be confusing :) -A1kmm */
601 if(arec
->aconf
->flags
& CONF_FLAGS_TEMPORARY
||
602 (arec
->type
!= CONF_CLIENT
&& arec
->type
!= CONF_EXEMPTDLINE
))
605 store_next
= &arec
->next
;
609 arec
->aconf
->status
|= CONF_ILLEGAL
;
610 if(!arec
->aconf
->clients
)
611 free_conf(arec
->aconf
);
620 clear_out_address_conf_bans(void)
623 struct AddressRec
**store_next
;
624 struct AddressRec
*arec
, *arecn
;
626 for (i
= 0; i
< ATABLE_SIZE
; i
++)
628 store_next
= &atable
[i
];
629 for (arec
= atable
[i
]; arec
; arec
= arecn
)
632 /* We keep the temporary K-lines and destroy the
633 * permanent ones, just to be confusing :) -A1kmm */
634 if(arec
->aconf
->flags
& CONF_FLAGS_TEMPORARY
||
635 (arec
->type
== CONF_CLIENT
|| arec
->type
== CONF_EXEMPTDLINE
))
638 store_next
= &arec
->next
;
642 arec
->aconf
->status
|= CONF_ILLEGAL
;
643 if(!arec
->aconf
->clients
)
644 free_conf(arec
->aconf
);
654 * show_iline_prefix()
656 * inputs - pointer to struct Client requesting output
657 * - pointer to struct ConfItem
658 * - name to which iline prefix will be prefixed to
659 * output - pointer to static string with prefixes listed in ascii form
660 * side effects - NONE
663 show_iline_prefix(struct Client
*sptr
, struct ConfItem
*aconf
, char *name
)
665 static char prefix_of_host
[USERLEN
+ 15];
668 prefix_ptr
= prefix_of_host
;
671 if(IsNeedIdentd(aconf
))
673 if(IsConfDoSpoofIp(aconf
))
675 if(IsOper(sptr
) && IsConfExemptFlood(aconf
))
677 if(IsOper(sptr
) && IsConfExemptDNSBL(aconf
) && !IsConfExemptKline(aconf
))
679 if(IsOper(sptr
) && IsConfExemptKline(aconf
))
681 if(IsOper(sptr
) && IsConfExemptLimits(aconf
))
684 strncpy(prefix_ptr
, name
, USERLEN
);
685 return (prefix_of_host
);
690 * Inputs: pointer to client to report to
692 * Side effects: Reports configured auth{} blocks to client_p
695 report_auth(struct Client
*client_p
)
697 char *name
, *host
, *pass
, *user
, *classname
;
698 struct AddressRec
*arec
;
699 struct ConfItem
*aconf
;
702 for (i
= 0; i
< ATABLE_SIZE
; i
++)
703 for (arec
= atable
[i
]; arec
; arec
= arec
->next
)
704 if(arec
->type
== CONF_CLIENT
)
708 if(!IsOper(client_p
) && IsConfDoSpoofIp(aconf
))
711 get_printable_conf(aconf
, &name
, &host
, &pass
, &user
, &port
,
714 sendto_one_numeric(client_p
, RPL_STATSILINE
,
715 form_str(RPL_STATSILINE
),
716 name
, show_iline_prefix(client_p
, aconf
, user
),
717 show_ip_conf(aconf
, client_p
) ? host
: "255.255.255.255",
724 * inputs - Client to report to, mask
726 * side effects - Reports configured K-lines to client_p.
729 report_Klines(struct Client
*source_p
)
731 char *host
, *pass
, *user
, *oper_reason
;
732 struct AddressRec
*arec
;
733 struct ConfItem
*aconf
= NULL
;
736 for (i
= 0; i
< ATABLE_SIZE
; i
++)
738 for (arec
= atable
[i
]; arec
; arec
= arec
->next
)
740 if(arec
->type
== CONF_KILL
)
744 /* its a tempkline, theyre reported elsewhere */
745 if(aconf
->flags
& CONF_FLAGS_TEMPORARY
)
748 get_printable_kline(source_p
, aconf
, &host
, &pass
, &user
, &oper_reason
);
749 sendto_one_numeric(source_p
, RPL_STATSKLINE
,
750 form_str(RPL_STATSKLINE
),
751 'K', host
, user
, pass
,
752 oper_reason
? "|" : "",
753 oper_reason
? oper_reason
: "");