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 $
30 #include "ircd_defs.h"
35 #include "irc_string.h"
38 static unsigned long hash_ipv6(struct sockaddr
*, int);
40 static unsigned long hash_ipv4(struct sockaddr
*, int);
43 /* int parse_netmask(const char *, struct irc_sockaddr_storage *, int *);
44 * Input: A hostmask, or an IPV4/6 address.
45 * Output: An integer describing whether it is an IPV4, IPV6 address or a
46 * hostmask, an address(if it is an IP mask),
47 * a bitlength(if it is IP mask).
51 parse_netmask(const char *text
, struct sockaddr
*naddr
, int *nb
)
53 char *ip
= LOCAL_COPY(text
);
55 struct irc_sockaddr_storage
*addr
, xaddr
;
63 addr
= (struct irc_sockaddr_storage
*)&xaddr
;
65 addr
= (struct irc_sockaddr_storage
*)naddr
;
70 if((ptr
= strchr(ip
, '/')))
79 if(inetpton_sock(ip
, (struct sockaddr
*)addr
) > 0)
87 if((ptr
= strchr(ip
, '/')))
96 if(inetpton_sock(ip
, (struct sockaddr
*)addr
) > 0)
104 /* Hashtable stuff...now external as its used in m_stats.c */
105 struct AddressRec
*atable
[ATABLE_SIZE
];
110 memset(&atable
, 0, sizeof(atable
));
113 /* unsigned long hash_ipv4(struct irc_sockaddr_storage*)
114 * Input: An IP address.
115 * Output: A hash value of the IP address.
119 hash_ipv4(struct sockaddr
*saddr
, int bits
)
121 struct sockaddr_in
*addr
= (struct sockaddr_in
*) saddr
;
125 unsigned long av
= ntohl(addr
->sin_addr
.s_addr
) & ~((1 << (32 - bits
)) - 1);
126 return (av
^ (av
>> 12) ^ (av
>> 24)) & (ATABLE_SIZE
- 1);
132 /* unsigned long hash_ipv6(struct irc_sockaddr_storage*)
133 * Input: An IP address.
134 * Output: A hash value of the IP address.
139 hash_ipv6(struct sockaddr
*saddr
, int bits
)
141 struct sockaddr_in6
*addr
= (struct sockaddr_in6
*) saddr
;
142 unsigned long v
= 0, n
;
143 for (n
= 0; n
< 16; n
++)
147 v
^= addr
->sin6_addr
.s6_addr
[n
];
152 v
^= addr
->sin6_addr
.s6_addr
[n
] & ~((1 << (8 - bits
)) - 1);
153 return v
& (ATABLE_SIZE
- 1);
156 return v
& (ATABLE_SIZE
- 1);
158 return v
& (ATABLE_SIZE
- 1);
162 /* int hash_text(const char *start)
163 * Input: The start of the text to hash.
164 * Output: The hash of the string between 1 and (TH_MAX-1)
165 * Side-effects: None.
168 hash_text(const char *start
)
170 const char *p
= start
;
175 h
= (h
<< 4) - (h
+ (unsigned char) ToLower(*p
++));
178 return (h
& (ATABLE_SIZE
- 1));
181 /* unsigned long get_hash_mask(const char *)
182 * Input: The text to hash.
183 * Output: The hash of the string right of the first '.' past the last
184 * wildcard in the string.
185 * Side-effects: None.
188 get_mask_hash(const char *text
)
190 const char *hp
= "", *p
;
192 for (p
= text
+ strlen(text
) - 1; p
>= text
; p
--)
193 if(*p
== '*' || *p
== '?')
194 return hash_text(hp
);
197 return hash_text(text
);
200 /* struct ConfItem* find_conf_by_address(const char*, struct irc_sockaddr_storage*,
201 * int type, int fam, const char *username)
202 * Input: The hostname, the address, the type of mask to find, the address
203 * family, the username.
204 * Output: The matching value with the highest precedence.
206 * Note: Setting bit 0 of the type means that the username is ignored.
209 find_conf_by_address(const char *name
, const char *sockhost
,
210 const char *orighost
,
211 struct sockaddr
*addr
, int type
, int fam
,
212 const char *username
)
214 unsigned long hprecv
= 0;
215 struct ConfItem
*hprec
= NULL
;
216 struct AddressRec
*arec
;
224 /* Check for IPV6 matches... */
229 for (b
= 128; b
>= 0; b
-= 16)
231 for (arec
= atable
[hash_ipv6(addr
, b
)]; arec
; arec
= arec
->next
)
232 if(arec
->type
== (type
& ~0x1) &&
233 arec
->masktype
== HM_IPV6
&&
234 comp_with_mask_sock(addr
, (struct sockaddr
*)&arec
->Mask
.ipa
.addr
,
235 arec
->Mask
.ipa
.bits
) && (type
& 0x1
240 && arec
->precedence
> hprecv
)
242 hprecv
= arec
->precedence
;
251 for (b
= 32; b
>= 0; b
-= 8)
253 for (arec
= atable
[hash_ipv4(addr
, b
)]; arec
; arec
= arec
->next
)
254 if(arec
->type
== (type
& ~0x1) &&
255 arec
->masktype
== HM_IPV4
&&
256 arec
->precedence
> hprecv
&&
257 comp_with_mask_sock(addr
, (struct sockaddr
*)&arec
->Mask
.ipa
.addr
,
258 arec
->Mask
.ipa
.bits
) &&
259 (type
& 0x1 || match(arec
->username
, username
)))
261 hprecv
= arec
->precedence
;
272 for (p
= orighost
; p
!= NULL
;)
274 for (arec
= atable
[hash_text(p
)]; arec
; arec
= arec
->next
)
276 if((arec
->type
== (type
& ~0x1)) &&
277 (arec
->masktype
== HM_HOST
) &&
278 arec
->precedence
> hprecv
&&
279 match(arec
->Mask
.hostname
, orighost
) &&
280 (type
& 0x1 || match(arec
->username
, username
)))
282 hprecv
= arec
->precedence
;
291 for (arec
= atable
[0]; arec
; arec
= arec
->next
)
293 if(arec
->type
== (type
& ~0x1) &&
294 arec
->masktype
== HM_HOST
&&
295 arec
->precedence
> hprecv
&&
296 (match(arec
->Mask
.hostname
, orighost
) ||
297 (sockhost
&& match(arec
->Mask
.hostname
, sockhost
))) &&
298 (type
& 0x1 || match(arec
->username
, username
)))
300 hprecv
= arec
->precedence
;
309 /* And yes - we have to check p after strchr and p after increment for
311 for (p
= name
; p
!= NULL
;)
313 for (arec
= atable
[hash_text(p
)]; arec
; arec
= arec
->next
)
314 if((arec
->type
== (type
& ~0x1)) &&
315 (arec
->masktype
== HM_HOST
) &&
316 arec
->precedence
> hprecv
&&
317 match(arec
->Mask
.hostname
, name
) &&
318 (type
& 0x1 || match(arec
->username
, username
)))
320 hprecv
= arec
->precedence
;
329 for (arec
= atable
[0]; arec
; arec
= arec
->next
)
331 if(arec
->type
== (type
& ~0x1) &&
332 arec
->masktype
== HM_HOST
&&
333 arec
->precedence
> hprecv
&&
334 (match(arec
->Mask
.hostname
, name
) ||
335 (sockhost
&& match(arec
->Mask
.hostname
, sockhost
))) &&
336 (type
& 0x1 || match(arec
->username
, username
)))
338 hprecv
= arec
->precedence
;
346 /* struct ConfItem* find_address_conf(const char*, const char*,
347 * struct irc_sockaddr_storage*, int);
348 * Input: The hostname, username, address, address family.
349 * Output: The applicable ConfItem.
353 find_address_conf(const char *host
, const char *sockhost
, const char *user
,
354 const char *notildeuser
, struct sockaddr
*ip
, int aftype
)
356 struct ConfItem
*iconf
, *kconf
;
359 /* Find the best I-line... If none, return NULL -A1kmm */
360 if(!(iconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_CLIENT
, aftype
, user
)))
362 /* Find what their visible username will be.
363 * Note that the username without tilde may contain one char more.
365 vuser
= IsNoTilde(iconf
) ? notildeuser
: user
;
367 /* If they are exempt from K-lines, return the best I-line. -A1kmm */
368 if(IsConfExemptKline(iconf
))
371 /* Find the best K-line... -A1kmm */
372 kconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_KILL
, aftype
, user
);
374 /* If they are K-lined, return the K-line */
378 /* if theres a spoof, check it against klines.. */
379 if(IsConfDoSpoofIp(iconf
))
381 char *p
= strchr(iconf
->name
, '@');
383 /* note, we dont need to pass sockhost here, as its
384 * guaranteed to not match by whats above.. --anfl
389 kconf
= find_conf_by_address(p
+1, NULL
, NULL
, ip
, CONF_KILL
, aftype
, iconf
->name
);
393 kconf
= find_conf_by_address(iconf
->name
, NULL
, NULL
, ip
, CONF_KILL
, aftype
, vuser
);
399 /* if no_tilde, check the username without tilde against klines too
403 kconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_KILL
, aftype
, vuser
);
408 /* hunt for a gline */
409 if(ConfigFileEntry
.glines
)
411 kconf
= find_conf_by_address(host
, sockhost
, NULL
, ip
, CONF_GLINE
, aftype
, user
);
413 if((kconf
!= NULL
) && !IsConfExemptGline(iconf
))
420 /* struct ConfItem* find_dline(struct irc_sockaddr_storage*, int)
421 * Input: An address, an address family.
422 * Output: The best matching D-line or exempt line.
423 * Side effects: None.
426 find_dline(struct sockaddr
*addr
, int aftype
)
428 struct ConfItem
*eline
;
429 eline
= find_conf_by_address(NULL
, NULL
, NULL
, addr
, CONF_EXEMPTDLINE
| 1, aftype
, NULL
);
432 return find_conf_by_address(NULL
, NULL
, NULL
, addr
, CONF_DLINE
| 1, aftype
, NULL
);
435 /* void find_exact_conf_by_address(const char*, int, const char *)
437 * Output: ConfItem if found
441 find_exact_conf_by_address(const char *address
, int type
, const char *username
)
445 struct AddressRec
*arec
;
446 struct irc_sockaddr_storage addr
;
449 address
= "/NOMATCH!/";
450 arec
= MyMalloc(sizeof(struct AddressRec
));
451 masktype
= parse_netmask(address
, (struct sockaddr
*)&addr
, &bits
);
453 if(masktype
== HM_IPV6
)
455 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
456 hv
= hash_ipv6((struct sockaddr
*)&addr
, bits
- bits
% 16);
460 if(masktype
== HM_IPV4
)
462 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
463 hv
= hash_ipv4((struct sockaddr
*)&addr
, bits
- bits
% 8);
467 hv
= get_mask_hash(address
);
469 for (arec
= atable
[hv
]; arec
; arec
= arec
->next
)
471 if (arec
->type
== type
&&
472 arec
->masktype
== masktype
&&
473 (arec
->username
== NULL
|| username
== NULL
? arec
->username
== username
: !irccmp(arec
->username
, username
)))
475 if (masktype
== HM_HOST
)
477 if (!irccmp(arec
->Mask
.hostname
, address
))
482 if (arec
->Mask
.ipa
.bits
== bits
&&
483 comp_with_mask_sock((struct sockaddr
*)&arec
->Mask
.ipa
.addr
, (struct sockaddr
*)&addr
, bits
))
491 /* void add_conf_by_address(const char*, int, const char *,
492 * struct ConfItem *aconf)
495 * Side-effects: Adds this entry to the hash table.
498 add_conf_by_address(const char *address
, int type
, const char *username
, struct ConfItem
*aconf
)
500 static unsigned long prec_value
= 0xFFFFFFFF;
503 struct AddressRec
*arec
;
506 address
= "/NOMATCH!/";
507 arec
= MyMalloc(sizeof(struct AddressRec
));
508 masktype
= parse_netmask(address
, (struct sockaddr
*)&arec
->Mask
.ipa
.addr
, &bits
);
509 arec
->Mask
.ipa
.bits
= bits
;
510 arec
->masktype
= masktype
;
512 if(masktype
== HM_IPV6
)
514 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
516 arec
->next
= atable
[(hv
= hash_ipv6((struct sockaddr
*)&arec
->Mask
.ipa
.addr
, bits
))];
521 if(masktype
== HM_IPV4
)
523 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
525 arec
->next
= atable
[(hv
= hash_ipv4((struct sockaddr
*)&arec
->Mask
.ipa
.addr
, bits
))];
530 arec
->Mask
.hostname
= address
;
531 arec
->next
= atable
[(hv
= get_mask_hash(address
))];
534 arec
->username
= username
;
536 arec
->precedence
= prec_value
--;
540 /* void delete_one_address(const char*, struct ConfItem*)
541 * Input: An address string, the associated ConfItem.
543 * Side effects: Deletes an address record. Frees the ConfItem if there
544 * is nothing referencing it, sets it as illegal otherwise.
547 delete_one_address_conf(const char *address
, struct ConfItem
*aconf
)
551 struct AddressRec
*arec
, *arecl
= NULL
;
552 struct irc_sockaddr_storage addr
;
553 masktype
= parse_netmask(address
, (struct sockaddr
*)&addr
, &bits
);
555 if(masktype
== HM_IPV6
)
557 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
559 hv
= hash_ipv6((struct sockaddr
*)&addr
, bits
);
563 if(masktype
== HM_IPV4
)
565 /* We have to do this, since we do not re-hash for every bit -A1kmm. */
567 hv
= hash_ipv4((struct sockaddr
*)&addr
, bits
);
570 hv
= get_mask_hash(address
);
571 for (arec
= atable
[hv
]; arec
; arec
= arec
->next
)
573 if(arec
->aconf
== aconf
)
576 arecl
->next
= arec
->next
;
578 atable
[hv
] = arec
->next
;
579 aconf
->status
|= CONF_ILLEGAL
;
589 /* void clear_out_address_conf(void)
592 * Side effects: Clears out all address records in the hash table,
593 * frees them, and frees the ConfItems if nothing references
594 * them, otherwise sets them as illegal.
597 clear_out_address_conf(void)
600 struct AddressRec
**store_next
;
601 struct AddressRec
*arec
, *arecn
;
603 for (i
= 0; i
< ATABLE_SIZE
; i
++)
605 store_next
= &atable
[i
];
606 for (arec
= atable
[i
]; arec
; arec
= arecn
)
609 /* We keep the temporary K-lines and destroy the
610 * permanent ones, just to be confusing :) -A1kmm */
611 if(arec
->aconf
->flags
& CONF_FLAGS_TEMPORARY
||
612 (arec
->type
!= CONF_CLIENT
&& arec
->type
!= CONF_EXEMPTDLINE
))
615 store_next
= &arec
->next
;
619 arec
->aconf
->status
|= CONF_ILLEGAL
;
620 if(!arec
->aconf
->clients
)
621 free_conf(arec
->aconf
);
630 clear_out_address_conf_bans(void)
633 struct AddressRec
**store_next
;
634 struct AddressRec
*arec
, *arecn
;
636 for (i
= 0; i
< ATABLE_SIZE
; i
++)
638 store_next
= &atable
[i
];
639 for (arec
= atable
[i
]; arec
; arec
= arecn
)
642 /* We keep the temporary K-lines and destroy the
643 * permanent ones, just to be confusing :) -A1kmm */
644 if(arec
->aconf
->flags
& CONF_FLAGS_TEMPORARY
||
645 (arec
->type
== CONF_CLIENT
|| arec
->type
== CONF_EXEMPTDLINE
))
648 store_next
= &arec
->next
;
652 arec
->aconf
->status
|= CONF_ILLEGAL
;
653 if(!arec
->aconf
->clients
)
654 free_conf(arec
->aconf
);
664 * show_iline_prefix()
666 * inputs - pointer to struct Client requesting output
667 * - pointer to struct ConfItem
668 * - name to which iline prefix will be prefixed to
669 * output - pointer to static string with prefixes listed in ascii form
670 * side effects - NONE
673 show_iline_prefix(struct Client
*sptr
, struct ConfItem
*aconf
, char *name
)
675 static char prefix_of_host
[USERLEN
+ 15];
678 prefix_ptr
= prefix_of_host
;
681 if(IsNeedIdentd(aconf
))
683 if(IsConfDoSpoofIp(aconf
))
685 if(IsOper(sptr
) && IsConfExemptFlood(aconf
))
687 if(IsOper(sptr
) && IsConfExemptGline(aconf
) && !IsConfExemptKline(aconf
))
689 if(IsOper(sptr
) && IsConfExemptDNSBL(aconf
) && !IsConfExemptKline(aconf
))
691 if(IsOper(sptr
) && IsConfExemptKline(aconf
))
693 if(IsOper(sptr
) && IsConfExemptLimits(aconf
))
696 strncpy(prefix_ptr
, name
, USERLEN
);
697 return (prefix_of_host
);
702 * Inputs: pointer to client to report to
704 * Side effects: Reports configured auth{} blocks to client_p
707 report_auth(struct Client
*client_p
)
709 char *name
, *host
, *pass
, *user
, *classname
;
710 struct AddressRec
*arec
;
711 struct ConfItem
*aconf
;
714 for (i
= 0; i
< ATABLE_SIZE
; i
++)
715 for (arec
= atable
[i
]; arec
; arec
= arec
->next
)
716 if(arec
->type
== CONF_CLIENT
)
720 if(!IsOper(client_p
) && IsConfDoSpoofIp(aconf
))
723 get_printable_conf(aconf
, &name
, &host
, &pass
, &user
, &port
,
726 sendto_one_numeric(client_p
, RPL_STATSILINE
,
727 form_str(RPL_STATSILINE
),
728 name
, show_iline_prefix(client_p
, aconf
, user
),
729 show_ip_conf(aconf
, client_p
) ? host
: "255.255.255.255",
736 * inputs - Client to report to, mask
738 * side effects - Reports configured K-lines to client_p.
741 report_Klines(struct Client
*source_p
)
743 char *host
, *pass
, *user
, *oper_reason
;
744 struct AddressRec
*arec
;
745 struct ConfItem
*aconf
= NULL
;
748 for (i
= 0; i
< ATABLE_SIZE
; i
++)
750 for (arec
= atable
[i
]; arec
; arec
= arec
->next
)
752 if(arec
->type
== CONF_KILL
)
756 /* its a tempkline, theyre reported elsewhere */
757 if(aconf
->flags
& CONF_FLAGS_TEMPORARY
)
760 get_printable_kline(source_p
, aconf
, &host
, &pass
, &user
, &oper_reason
);
761 sendto_one_numeric(source_p
, RPL_STATSKLINE
,
762 form_str(RPL_STATSKLINE
),
763 'K', host
, user
, pass
,
764 oper_reason
? "|" : "",
765 oper_reason
? oper_reason
: "");