2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
53 * Permission to use, copy, modify, and distribute this software for any
54 * purpose with or without fee is hereby granted, provided that the above
55 * copyright notice and this permission notice appear in all copies.
57 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
58 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
59 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
60 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
61 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
62 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
63 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
67 /* Original copyright ISC as above.
68 * Code modified specifically for ircd use from the following orginal files
85 typedef struct addrinfo rb_addrinfo
;
88 #include "getaddrinfo.h"
89 #include "getnameinfo.h"
90 #define getaddrinfo rb_getaddrinfo
91 #define getnameinfo rb_getnameinfo
92 #define freeaddrinfo rb_freeaddrinfo
94 extern const char * get_windows_nameservers(void);
95 typedef struct rb_addrinfo rb_addrinfo
;
99 #include "ircd_defs.h"
106 #define NS_TYPE_ELT 0x40 /* EDNS0 extended label type */
107 #define DNS_LABELTYPE_BITSTRING 0x41
108 #define DNS_MAXLINE 128
110 struct rb_sockaddr_storage irc_nsaddr_list
[IRCD_MAXNS
];
112 char irc_domain
[IRCD_RES_HOSTLEN
+ 1];
114 static const char digitvalue
[256] = {
115 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*16*/
116 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*32*/
117 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*48*/
118 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /*64*/
119 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*80*/
120 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*96*/
121 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*112*/
122 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*128*/
123 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
124 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
125 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
126 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
127 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
128 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
129 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
130 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*256*/
134 static int parse_resvconf(void);
136 static void parse_windows_resolvers(void);
139 static void add_nameserver(const char *);
141 static const char digits
[] = "0123456789";
142 static int labellen(const unsigned char *lp
);
143 static int special(int ch
);
144 static int printable(int ch
);
145 static int irc_decode_bitstring(const char **cpp
, char *dn
, const char *eom
);
146 static int irc_ns_name_compress(const char *src
, unsigned char *dst
, size_t dstsiz
,
147 const unsigned char **dnptrs
, const unsigned char **lastdnptr
);
148 static int irc_dn_find(const unsigned char *, const unsigned char *, const unsigned char * const *,
149 const unsigned char * const *);
150 static int irc_encode_bitsring(const char **, const char *, unsigned char **, unsigned char **,
152 static int irc_ns_name_uncompress(const unsigned char *, const unsigned char *,
153 const unsigned char *, char *, size_t);
154 static int irc_ns_name_unpack(const unsigned char *, const unsigned char *,
155 const unsigned char *, unsigned char *,
157 static int irc_ns_name_ntop(const char *, char *, size_t);
158 static int irc_ns_name_skip(const unsigned char **, const unsigned char *);
159 static int mklower(int ch
);
168 parse_windows_resolvers();
170 if (irc_nscount
== 0)
171 add_nameserver("127.0.0.1");
177 parse_windows_resolvers(void)
179 const char *ns
= get_windows_nameservers();
182 char *buf
= rb_strdup(ns
);
183 for(server
= rb_strtok_r(buf
, " ", &p
); server
!= NULL
;server
= rb_strtok_r(NULL
, " ", &p
))
185 add_nameserver(server
);
193 * output - -1 if failure 0 if success
194 * side effects - fills in irc_nsaddr_list
202 char input
[DNS_MAXLINE
];
205 /* XXX "/etc/resolv.conf" should be from a define in setup.h perhaps
206 * for cygwin support etc. this hardcodes it to unix for now -db
208 if ((file
= fopen("/etc/resolv.conf", "r")) == NULL
)
211 while (fgets(input
, sizeof(input
), file
) != NULL
)
213 /* blow away any newline */
214 if ((p
= strpbrk(input
, "\r\n")) != NULL
)
218 /* skip until something thats not a space is seen */
221 /* if at this point, have a '\0' then continue */
225 /* Ignore comment lines immediately */
226 if (*p
== '#' || *p
== ';')
229 /* skip until a space is found */
231 while (!isspace(*p
) && *p
!= '\0')
234 continue; /* no arguments?.. ignore this line */
235 /* blow away the space character */
238 /* skip these spaces that are before the argument */
241 /* Now arg should be right where p is pointing */
243 if ((p
= strpbrk(arg
, " \t")) != NULL
)
244 *p
= '\0'; /* take the first word */
246 if (rb_strcasecmp(opt
, "domain") == 0)
247 rb_strlcpy(irc_domain
, arg
, sizeof(irc_domain
));
248 else if (rb_strcasecmp(opt
, "nameserver") == 0)
259 * input - either an IPV4 address in dotted quad
260 * or an IPV6 address in : format
262 * side effects - entry in irc_nsaddr_list is filled in as needed
265 add_nameserver(const char *arg
)
267 rb_addrinfo hints
, *res
;
269 /* Done max number of nameservers? */
270 if (irc_nscount
>= IRCD_MAXNS
)
273 memset(&hints
, 0, sizeof(hints
));
274 hints
.ai_family
= PF_UNSPEC
;
275 hints
.ai_socktype
= SOCK_DGRAM
;
276 hints
.ai_flags
= AI_PASSIVE
| AI_NUMERICHOST
;
278 if (getaddrinfo(arg
, "domain", &hints
, &res
))
284 memcpy(&irc_nsaddr_list
[irc_nscount
], res
->ai_addr
, res
->ai_addrlen
);
285 SET_SS_LEN(&irc_nsaddr_list
[irc_nscount
], res
->ai_addrlen
);
291 * Expand compressed domain name 'comp_dn' to full domain name.
292 * 'msg' is a pointer to the begining of the message,
293 * 'eomorig' points to the first location after the message,
294 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
295 * Return size of compressed name or -1 if there was an error.
298 irc_dn_expand(const unsigned char *msg
, const unsigned char *eom
,
299 const unsigned char *src
, char *dst
, int dstsiz
)
301 int n
= irc_ns_name_uncompress(msg
, eom
, src
, dst
, (size_t)dstsiz
);
303 if (n
> 0 && dst
[0] == '.')
309 * irc_ns_name_uncompress(msg, eom, src, dst, dstsiz)
310 * Expand compressed domain name to presentation format.
312 * Number of bytes read out of `src', or -1 (with errno set).
314 * Root domain returns as "." not "".
317 irc_ns_name_uncompress(const unsigned char *msg
, const unsigned char *eom
,
318 const unsigned char *src
, char *dst
, size_t dstsiz
)
320 unsigned char tmp
[NS_MAXCDNAME
];
323 if ((n
= irc_ns_name_unpack(msg
, eom
, src
, tmp
, sizeof tmp
)) == -1)
325 if (irc_ns_name_ntop((char*)tmp
, dst
, dstsiz
) == -1)
330 * irc_ns_name_unpack(msg, eom, src, dst, dstsiz)
331 * Unpack a domain name from a message, source may be compressed.
333 * -1 if it fails, or consumed octets if it succeeds.
336 irc_ns_name_unpack(const unsigned char *msg
, const unsigned char *eom
,
337 const unsigned char *src
, unsigned char *dst
,
340 const unsigned char *srcp
, *dstlim
;
342 int n
, len
, checked
, l
;
348 dstlim
= dst
+ dstsiz
;
349 if (srcp
< msg
|| srcp
>= eom
) {
353 /* Fetch next label in domain name. */
354 while ((n
= *srcp
++) != 0) {
355 /* Check for indirection. */
356 switch (n
& NS_CMPRSFLGS
) {
360 if ((l
= labellen(srcp
- 1)) < 0) {
364 if (dstp
+ l
+ 1 >= dstlim
|| srcp
+ l
>= eom
) {
370 memcpy(dstp
, srcp
, l
);
381 len
= srcp
- src
+ 1;
382 srcp
= msg
+ (((n
& 0x3f) << 8) | (*srcp
& 0xff));
383 if (srcp
< msg
|| srcp
>= eom
) { /* Out of range. */
389 * Check for loops in the compressed name;
390 * if we've looked at the whole message,
391 * there must be a loop.
393 if (checked
>= eom
- msg
) {
401 return (-1); /* flag error */
411 * irc_ns_name_ntop(src, dst, dstsiz)
412 * Convert an encoded domain name to printable ascii as per RFC1035.
414 * Number of bytes written to buffer, or -1 (with errno set)
416 * The root is returned as "."
417 * All other domains are returned in non absolute form
420 irc_ns_name_ntop(const char *src
, char *dst
, size_t dstsiz
)
432 while ((n
= *cp
++) != 0) {
433 if ((n
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
) {
434 /* Some kind of compression pointer. */
445 if ((l
= labellen((const unsigned char*)(cp
- 1))) < 0) {
446 errno
= EMSGSIZE
; /* XXX */
453 if ((n
& NS_CMPRSFLGS
) == NS_TYPE_ELT
) {
456 if (n
!= DNS_LABELTYPE_BITSTRING
) {
457 /* XXX: labellen should reject this case */
461 if ((m
= irc_decode_bitstring(&cp
, dn
, eom
)) < 0)
469 for ((void)NULL
; l
> 0; l
--) {
478 } else if (!printable(c
)) {
484 *dn
++ = digits
[c
/ 100];
485 *dn
++ = digits
[(c
% 100) / 10];
486 *dn
++ = digits
[c
% 10];
512 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
513 * Return the size of the compressed name or -1.
514 * 'length' is the size of the array pointed to by 'comp_dn'.
517 irc_dn_comp(const char *src
, unsigned char *dst
, int dstsiz
,
518 const unsigned char **dnptrs
, const unsigned char **lastdnptr
)
520 return(irc_ns_name_compress(src
, dst
, (size_t)dstsiz
,
521 (const unsigned char **)dnptrs
,
522 (const unsigned char **)lastdnptr
));
526 * Skip over a compressed domain name. Return the size or -1.
529 irc_dn_skipname(const unsigned char *ptr
, const unsigned char *eom
) {
530 const unsigned char *saveptr
= ptr
;
532 if (irc_ns_name_skip(&ptr
, eom
) == -1)
534 return(ptr
- saveptr
);
538 * ns_name_skip(ptrptr, eom)
539 * Advance *ptrptr to skip over the compressed name it points at.
541 * 0 on success, -1 (with errno set) on failure.
544 irc_ns_name_skip(const unsigned char **ptrptr
, const unsigned char *eom
)
546 const unsigned char *cp
;
552 while (cp
< eom
&& (n
= *cp
++) != 0)
554 /* Check for indirection. */
555 switch (n
& NS_CMPRSFLGS
)
557 case 0: /* normal case, n == len */
560 case NS_TYPE_ELT
: /* EDNS0 extended label */
561 if ((l
= labellen(cp
- 1)) < 0)
563 errno
= EMSGSIZE
; /* XXX */
569 case NS_CMPRSFLGS
: /* indirection */
572 default: /* illegal type */
591 irc_ns_get16(const unsigned char *src
)
595 IRC_NS_GET16(dst
, src
);
600 irc_ns_get32(const unsigned char *src
)
604 IRC_NS_GET32(dst
, src
);
609 irc_ns_put16(unsigned int src
, unsigned char *dst
)
611 IRC_NS_PUT16(src
, dst
);
615 irc_ns_put32(unsigned long src
, unsigned char *dst
)
617 IRC_NS_PUT32(src
, dst
);
624 * Thinking in noninternationalized USASCII (per the DNS spec),
625 * is this characted special ("in need of quoting") ?
637 case 0x5C: /* '\\' */
640 /* Special modifiers in zone files. */
650 labellen(const unsigned char *lp
)
653 unsigned char l
= *lp
;
655 if ((l
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
)
657 /* should be avoided by the caller */
661 if ((l
& NS_CMPRSFLGS
) == NS_TYPE_ELT
)
663 if (l
== DNS_LABELTYPE_BITSTRING
)
665 if ((bitlen
= *(lp
+ 1)) == 0)
667 return((bitlen
+ 7 ) / 8 + 1);
670 return(-1); /* unknwon ELT */
679 * Thinking in noninternationalized USASCII (per the DNS spec),
680 * is this character visible and not a space when printed ?
687 return(ch
> 0x20 && ch
< 0x7f);
691 irc_decode_bitstring(const char **cpp
, char *dn
, const char *eom
)
693 const char *cp
= *cpp
;
697 if ((blen
= (*cp
& 0xff)) == 0)
699 plen
= (blen
+ 3) / 4;
700 plen
+= sizeof("\\[x/]") + (blen
> 99 ? 3 : (blen
> 9) ? 2 : 1);
701 if (dn
+ plen
>= eom
)
705 dn
+= sprintf(dn
, "\\[x");
706 for (b
= blen
; b
> 7; b
-= 8, cp
++)
707 dn
+= sprintf(dn
, "%02x", *cp
& 0xff);
710 dn
+= sprintf(dn
, "%02x", tc
& (0xff << (8 - b
)));
713 dn
+= sprintf(dn
, "%1x",
714 ((tc
>> 4) & 0x0f) & (0x0f << (4 - b
)));
716 dn
+= sprintf(dn
, "/%d]", blen
);
723 * irc_ns_name_pton(src, dst, dstsiz)
724 * Convert a ascii string into an encoded domain name as per RFC1035.
727 * 1 if string was fully qualified
728 * 0 is string was not fully qualified
730 * Enforces label and domain length limits.
733 irc_ns_name_pton(const char *src
, unsigned char *dst
, size_t dstsiz
)
735 unsigned char *label
, *bp
, *eom
;
737 int c
, n
, escaped
, e
= 0;
745 while ((c
= *src
++) != 0) {
747 if (c
== '[') { /* start a bit string label */
748 if ((cp
= strchr(src
, ']')) == NULL
) {
749 errno
= EINVAL
; /* ??? */
752 if ((e
= irc_encode_bitsring(&src
,
763 if ((c
= *src
++) == 0)
771 else if ((cp
= strchr(digits
, c
)) != NULL
) {
772 n
= (cp
- digits
) * 100;
773 if ((c
= *src
++) == 0 ||
774 (cp
= strchr(digits
, c
)) == NULL
) {
778 n
+= (cp
- digits
) * 10;
779 if ((c
= *src
++) == 0 ||
780 (cp
= strchr(digits
, c
)) == NULL
) {
792 } else if (c
== '\\') {
795 } else if (c
== '.') {
796 c
= (bp
- label
- 1);
797 if ((c
& NS_CMPRSFLGS
) != 0) { /* Label too big. */
806 /* Fully qualified ? */
815 if ((bp
- dst
) > NS_MAXCDNAME
) {
821 if (c
== 0 || *src
== '.') {
832 *bp
++ = (unsigned char)c
;
834 c
= (bp
- label
- 1);
835 if ((c
& NS_CMPRSFLGS
) != 0) { /* Label too big. */
853 if ((bp
- dst
) > NS_MAXCDNAME
)
863 * irc_ns_name_pack(src, dst, dstsiz, dnptrs, lastdnptr)
864 * Pack domain name 'domain' into 'comp_dn'.
866 * Size of the compressed name, or -1.
868 * 'dnptrs' is an array of pointers to previous compressed names.
869 * dnptrs[0] is a pointer to the beginning of the message. The array
871 * 'lastdnptr' is a pointer to the end of the array pointed to
874 * The list of pointers in dnptrs is updated for labels inserted into
875 * the message as we compress the name. If 'dnptr' is NULL, we don't
876 * try to compress names. If 'lastdnptr' is NULL, we don't update the
880 irc_ns_name_pack(const unsigned char *src
, unsigned char *dst
, int dstsiz
,
881 const unsigned char **dnptrs
, const unsigned char **lastdnptr
)
884 const unsigned char **cpp
, **lpp
, *eob
, *msg
;
885 const unsigned char *srcp
;
892 if (dnptrs
!= NULL
) {
893 if ((msg
= *dnptrs
++) != NULL
) {
894 for (cpp
= dnptrs
; *cpp
!= NULL
; cpp
++)
896 lpp
= cpp
; /* end of list to search */
901 /* make sure the domain we are about to add is legal */
907 if ((n
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
) {
911 if ((l0
= labellen(srcp
)) < 0) {
916 if (l
> NS_MAXCDNAME
) {
923 /* from here on we need to reset compression pointer array on error */
926 /* Look to see if we can use pointers. */
928 if (n
!= 0 && msg
!= NULL
) {
929 l
= irc_dn_find(srcp
, msg
, (const unsigned char * const *)dnptrs
,
930 (const unsigned char * const *)lpp
);
932 if (dstp
+ 1 >= eob
) {
935 *dstp
++ = (l
>> 8) | NS_CMPRSFLGS
;
939 /* Not found, save it. */
940 if (lastdnptr
!= NULL
&& cpp
< lastdnptr
- 1 &&
941 (dstp
- msg
) < 0x4000 && first
) {
947 /* copy label to buffer */
948 if ((n
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
) {
949 /* Should not happen. */
953 if (dstp
+ 1 + n
>= eob
) {
956 memcpy(dstp
, srcp
, n
+ 1);
972 irc_ns_name_compress(const char *src
, unsigned char *dst
, size_t dstsiz
,
973 const unsigned char **dnptrs
, const unsigned char **lastdnptr
)
975 unsigned char tmp
[NS_MAXCDNAME
];
977 if (irc_ns_name_pton(src
, tmp
, sizeof tmp
) == -1)
979 return(irc_ns_name_pack(tmp
, dst
, dstsiz
, dnptrs
, lastdnptr
));
983 irc_encode_bitsring(const char **bp
, const char *end
, unsigned char **labelp
,
984 unsigned char **dst
, const char *eom
)
987 const char *cp
= *bp
;
989 const char *beg_blen
;
990 char *end_blen
= NULL
;
991 int value
= 0, count
= 0, tbcount
= 0, blen
= 0;
993 beg_blen
= end_blen
= NULL
;
995 /* a bitstring must contain at least 2 characters */
999 /* XXX: currently, only hex strings are supported */
1002 if (!isxdigit((*cp
) & 0xff)) /* reject '\[x/BLEN]' */
1005 for (tp
= (char*)(dst
+ 1); cp
< end
&& tp
< eom
; cp
++) {
1007 case ']': /* end of the bitstring */
1009 if (beg_blen
== NULL
)
1011 blen
= (int)strtol(beg_blen
, &end_blen
, 10);
1012 if (*end_blen
!= ']')
1016 *tp
++ = ((value
<< 4) & 0xff);
1017 cp
++; /* skip ']' */
1024 if (!isdigit(c
&0xff))
1026 if (beg_blen
== NULL
) {
1029 /* blen never begings with 0 */
1035 if (!isxdigit(c
&0xff))
1038 value
+= digitvalue
[(int)c
];
1052 if (cp
>= end
|| tp
>= eom
)
1056 * bit length validation:
1057 * If a <length> is present, the number of digits in the <bit-data>
1058 * MUST be just sufficient to contain the number of bits specified
1059 * by the <length>. If there are insignificant bits in a final
1060 * hexadecimal or octal digit, they MUST be zero.
1061 * RFC 2673, Section 3.2.
1066 if (((blen
+ 3) & ~3) != tbcount
)
1068 traillen
= tbcount
- blen
; /* between 0 and 3 */
1069 if (((value
<< (8 - traillen
)) & 0xff) != 0)
1077 /* encode the type and the significant bit fields */
1078 **labelp
= DNS_LABELTYPE_BITSTRING
;
1082 *dst
= (unsigned char*)tp
;
1088 * dn_find(domain, msg, dnptrs, lastdnptr)
1089 * Search for the counted-label name in an array of compressed names.
1091 * offset from msg if found, or -1.
1093 * dnptrs is the pointer to the first name on the list,
1094 * not the pointer to the start of the message.
1097 irc_dn_find(const unsigned char *domain
, const unsigned char *msg
,
1098 const unsigned char * const *dnptrs
,
1099 const unsigned char * const *lastdnptr
)
1101 const unsigned char *dn
, *cp
, *sp
;
1102 const unsigned char * const *cpp
;
1105 for (cpp
= dnptrs
; cpp
< lastdnptr
; cpp
++)
1109 * terminate search on:
1111 * compression pointer
1114 while (*sp
!= 0 && (*sp
& NS_CMPRSFLGS
) == 0 &&
1115 (sp
- msg
) < 0x4000) {
1118 while ((n
= *cp
++) != 0) {
1120 * check for indirection
1122 switch (n
& NS_CMPRSFLGS
) {
1123 case 0: /* normal case, n == len */
1124 n
= labellen(cp
- 1); /* XXX */
1129 for ((void)NULL
; n
> 0; n
--)
1130 if (mklower(*dn
++) !=
1133 /* Is next root for both ? */
1134 if (*dn
== '\0' && *cp
== '\0')
1139 case NS_CMPRSFLGS
: /* indirection */
1140 cp
= msg
+ (((n
& 0x3f) << 8) | *cp
);
1143 default: /* illegal type */
1157 * Thinking in noninternationalized USASCII (per the DNS spec),
1158 * convert this character to lower case if it's upper case.
1163 if (ch
>= 0x41 && ch
<= 0x5A)
1169 /* From resolv/mkquery.c */
1172 * Form all types of queries.
1173 * Returns the size of the result or -1.
1177 const char *dname
, /* domain name */
1178 int class, int type
, /* class and type of query */
1179 unsigned char *buf
, /* buffer to put query */
1180 int buflen
) /* size of buffer */
1185 const unsigned char *dnptrs
[20], **dpp
, **lastdnptr
;
1188 * Initialize header fields.
1190 if ((buf
== NULL
) || (buflen
< HFIXEDSZ
))
1192 memset(buf
, 0, HFIXEDSZ
);
1193 hp
= (HEADER
*)(void *)buf
;
1197 hp
->rd
= 1; /* recurse */
1198 hp
->rcode
= NO_ERRORS
;
1199 cp
= buf
+ HFIXEDSZ
;
1204 lastdnptr
= dnptrs
+ sizeof dnptrs
/ sizeof dnptrs
[0];
1206 if ((buflen
-= QFIXEDSZ
) < 0)
1208 if ((n
= irc_dn_comp(dname
, cp
, buflen
, dnptrs
, lastdnptr
)) < 0)
1213 IRC_NS_PUT16(type
, cp
);
1214 IRC_NS_PUT16(class, cp
);
1215 hp
->qdcount
= htons(1);