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
82 #include "getaddrinfo.h"
83 #include "getnameinfo.h"
84 #define getaddrinfo rb_getaddrinfo
85 #define getnameinfo rb_getnameinfo
86 #define freeaddrinfo rb_freeaddrinfo
88 extern const char * get_windows_nameservers(void);
92 #include "ircd_defs.h"
100 #define NS_TYPE_ELT 0x40 /* EDNS0 extended label type */
101 #define DNS_LABELTYPE_BITSTRING 0x41
102 #define DNS_MAXLINE 128
104 struct rb_sockaddr_storage irc_nsaddr_list
[IRCD_MAXNS
];
106 char irc_domain
[IRCD_RES_HOSTLEN
+ 1];
108 static const char digitvalue
[256] = {
109 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*16*/
110 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*32*/
111 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*48*/
112 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /*64*/
113 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*80*/
114 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*96*/
115 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*112*/
116 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*128*/
117 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
118 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
119 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
120 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
121 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
122 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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, /*256*/
127 static int parse_resvconf(void);
128 static void add_nameserver(const char *);
130 static const char digits
[] = "0123456789";
131 static int labellen(const unsigned char *lp
);
132 static int special(int ch
);
133 static int printable(int ch
);
134 static int irc_decode_bitstring(const char **cpp
, char *dn
, const char *eom
);
135 static int irc_ns_name_compress(const char *src
, unsigned char *dst
, size_t dstsiz
,
136 const unsigned char **dnptrs
, const unsigned char **lastdnptr
);
137 static int irc_dn_find(const unsigned char *, const unsigned char *, const unsigned char * const *,
138 const unsigned char * const *);
139 static int irc_encode_bitsring(const char **, const char *, unsigned char **, unsigned char **,
141 static int irc_ns_name_uncompress(const unsigned char *, const unsigned char *,
142 const unsigned char *, char *, size_t);
143 static int irc_ns_name_unpack(const unsigned char *, const unsigned char *,
144 const unsigned char *, unsigned char *,
146 static int irc_ns_name_ntop(const char *, char *, size_t);
147 static int irc_ns_name_skip(const unsigned char **, const unsigned char *);
148 static int mklower(int ch
);
155 if (irc_nscount
== 0)
156 add_nameserver("127.0.0.1");
163 * output - -1 if failure 0 if success
164 * side effects - fills in irc_nsaddr_list
172 char input
[DNS_MAXLINE
];
175 /* XXX "/etc/resolv.conf" should be from a define in setup.h perhaps
176 * for cygwin support etc. this hardcodes it to unix for now -db
178 if ((file
= fopen("/etc/resolv.conf", "r")) == NULL
)
181 while (fgets(input
, sizeof(input
), file
) != NULL
)
183 /* blow away any newline */
184 if ((p
= strpbrk(input
, "\r\n")) != NULL
)
188 /* skip until something thats not a space is seen */
191 /* if at this point, have a '\0' then continue */
195 /* Ignore comment lines immediately */
196 if (*p
== '#' || *p
== ';')
199 /* skip until a space is found */
201 while (!isspace(*p
) && *p
!= '\0')
204 continue; /* no arguments?.. ignore this line */
205 /* blow away the space character */
208 /* skip these spaces that are before the argument */
211 /* Now arg should be right where p is pointing */
213 if ((p
= strpbrk(arg
, " \t")) != NULL
)
214 *p
= '\0'; /* take the first word */
216 if (strcasecmp(opt
, "domain") == 0)
217 rb_strlcpy(irc_domain
, arg
, sizeof(irc_domain
));
218 else if (strcasecmp(opt
, "nameserver") == 0)
228 * input - either an IPV4 address in dotted quad
229 * or an IPV6 address in : format
231 * side effects - entry in irc_nsaddr_list is filled in as needed
234 add_nameserver(const char *arg
)
236 struct addrinfo hints
, *res
;
238 /* Done max number of nameservers? */
239 if (irc_nscount
>= IRCD_MAXNS
)
242 memset(&hints
, 0, sizeof(hints
));
243 hints
.ai_family
= PF_UNSPEC
;
244 hints
.ai_socktype
= SOCK_DGRAM
;
245 hints
.ai_flags
= AI_PASSIVE
| AI_NUMERICHOST
;
247 if (getaddrinfo(arg
, "domain", &hints
, &res
))
253 memcpy(&irc_nsaddr_list
[irc_nscount
], res
->ai_addr
, res
->ai_addrlen
);
254 SET_SS_LEN(&irc_nsaddr_list
[irc_nscount
], res
->ai_addrlen
);
260 * Expand compressed domain name 'comp_dn' to full domain name.
261 * 'msg' is a pointer to the begining of the message,
262 * 'eomorig' points to the first location after the message,
263 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
264 * Return size of compressed name or -1 if there was an error.
267 irc_dn_expand(const unsigned char *msg
, const unsigned char *eom
,
268 const unsigned char *src
, char *dst
, int dstsiz
)
270 int n
= irc_ns_name_uncompress(msg
, eom
, src
, dst
, (size_t)dstsiz
);
272 if (n
> 0 && dst
[0] == '.')
278 * irc_ns_name_uncompress(msg, eom, src, dst, dstsiz)
279 * Expand compressed domain name to presentation format.
281 * Number of bytes read out of `src', or -1 (with errno set).
283 * Root domain returns as "." not "".
286 irc_ns_name_uncompress(const unsigned char *msg
, const unsigned char *eom
,
287 const unsigned char *src
, char *dst
, size_t dstsiz
)
289 unsigned char tmp
[NS_MAXCDNAME
];
292 if ((n
= irc_ns_name_unpack(msg
, eom
, src
, tmp
, sizeof tmp
)) == -1)
294 if (irc_ns_name_ntop((char*)tmp
, dst
, dstsiz
) == -1)
299 * irc_ns_name_unpack(msg, eom, src, dst, dstsiz)
300 * Unpack a domain name from a message, source may be compressed.
302 * -1 if it fails, or consumed octets if it succeeds.
305 irc_ns_name_unpack(const unsigned char *msg
, const unsigned char *eom
,
306 const unsigned char *src
, unsigned char *dst
,
309 const unsigned char *srcp
, *dstlim
;
311 int n
, len
, checked
, l
;
317 dstlim
= dst
+ dstsiz
;
318 if (srcp
< msg
|| srcp
>= eom
) {
322 /* Fetch next label in domain name. */
323 while ((n
= *srcp
++) != 0) {
324 /* Check for indirection. */
325 switch (n
& NS_CMPRSFLGS
) {
329 if ((l
= labellen(srcp
- 1)) < 0) {
333 if (dstp
+ l
+ 1 >= dstlim
|| srcp
+ l
>= eom
) {
339 memcpy(dstp
, srcp
, l
);
350 len
= srcp
- src
+ 1;
351 srcp
= msg
+ (((n
& 0x3f) << 8) | (*srcp
& 0xff));
352 if (srcp
< msg
|| srcp
>= eom
) { /* Out of range. */
358 * Check for loops in the compressed name;
359 * if we've looked at the whole message,
360 * there must be a loop.
362 if (checked
>= eom
- msg
) {
370 return (-1); /* flag error */
380 * irc_ns_name_ntop(src, dst, dstsiz)
381 * Convert an encoded domain name to printable ascii as per RFC1035.
383 * Number of bytes written to buffer, or -1 (with errno set)
385 * The root is returned as "."
386 * All other domains are returned in non absolute form
389 irc_ns_name_ntop(const char *src
, char *dst
, size_t dstsiz
)
401 while ((n
= *cp
++) != 0) {
402 if ((n
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
) {
403 /* Some kind of compression pointer. */
414 if ((l
= labellen((const unsigned char*)(cp
- 1))) < 0) {
415 errno
= EMSGSIZE
; /* XXX */
422 if ((n
& NS_CMPRSFLGS
) == NS_TYPE_ELT
) {
425 if (n
!= DNS_LABELTYPE_BITSTRING
) {
426 /* XXX: labellen should reject this case */
430 if ((m
= irc_decode_bitstring(&cp
, dn
, eom
)) < 0)
438 for ((void)NULL
; l
> 0; l
--) {
447 } else if (!printable(c
)) {
453 *dn
++ = digits
[c
/ 100];
454 *dn
++ = digits
[(c
% 100) / 10];
455 *dn
++ = digits
[c
% 10];
481 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
482 * Return the size of the compressed name or -1.
483 * 'length' is the size of the array pointed to by 'comp_dn'.
486 irc_dn_comp(const char *src
, unsigned char *dst
, int dstsiz
,
487 const unsigned char **dnptrs
, const unsigned char **lastdnptr
)
489 return(irc_ns_name_compress(src
, dst
, (size_t)dstsiz
,
490 (const unsigned char **)dnptrs
,
491 (const unsigned char **)lastdnptr
));
495 * Skip over a compressed domain name. Return the size or -1.
498 irc_dn_skipname(const unsigned char *ptr
, const unsigned char *eom
) {
499 const unsigned char *saveptr
= ptr
;
501 if (irc_ns_name_skip(&ptr
, eom
) == -1)
503 return(ptr
- saveptr
);
507 * ns_name_skip(ptrptr, eom)
508 * Advance *ptrptr to skip over the compressed name it points at.
510 * 0 on success, -1 (with errno set) on failure.
513 irc_ns_name_skip(const unsigned char **ptrptr
, const unsigned char *eom
)
515 const unsigned char *cp
;
521 while (cp
< eom
&& (n
= *cp
++) != 0)
523 /* Check for indirection. */
524 switch (n
& NS_CMPRSFLGS
)
526 case 0: /* normal case, n == len */
529 case NS_TYPE_ELT
: /* EDNS0 extended label */
530 if ((l
= labellen(cp
- 1)) < 0)
532 errno
= EMSGSIZE
; /* XXX */
538 case NS_CMPRSFLGS
: /* indirection */
541 default: /* illegal type */
560 irc_ns_get16(const unsigned char *src
)
564 IRC_NS_GET16(dst
, src
);
569 irc_ns_get32(const unsigned char *src
)
573 IRC_NS_GET32(dst
, src
);
578 irc_ns_put16(unsigned int src
, unsigned char *dst
)
580 IRC_NS_PUT16(src
, dst
);
584 irc_ns_put32(unsigned long src
, unsigned char *dst
)
586 IRC_NS_PUT32(src
, dst
);
593 * Thinking in noninternationalized USASCII (per the DNS spec),
594 * is this characted special ("in need of quoting") ?
606 case 0x5C: /* '\\' */
609 /* Special modifiers in zone files. */
619 labellen(const unsigned char *lp
)
622 unsigned char l
= *lp
;
624 if ((l
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
)
626 /* should be avoided by the caller */
630 if ((l
& NS_CMPRSFLGS
) == NS_TYPE_ELT
)
632 if (l
== DNS_LABELTYPE_BITSTRING
)
634 if ((bitlen
= *(lp
+ 1)) == 0)
636 return((bitlen
+ 7 ) / 8 + 1);
639 return(-1); /* unknwon ELT */
648 * Thinking in noninternationalized USASCII (per the DNS spec),
649 * is this character visible and not a space when printed ?
656 return(ch
> 0x20 && ch
< 0x7f);
660 irc_decode_bitstring(const char **cpp
, char *dn
, const char *eom
)
662 const char *cp
= *cpp
;
666 if ((blen
= (*cp
& 0xff)) == 0)
668 plen
= (blen
+ 3) / 4;
669 plen
+= sizeof("\\[x/]") + (blen
> 99 ? 3 : (blen
> 9) ? 2 : 1);
670 if (dn
+ plen
>= eom
)
674 dn
+= sprintf(dn
, "\\[x");
675 for (b
= blen
; b
> 7; b
-= 8, cp
++)
676 dn
+= sprintf(dn
, "%02x", *cp
& 0xff);
679 dn
+= sprintf(dn
, "%02x", tc
& (0xff << (8 - b
)));
682 dn
+= sprintf(dn
, "%1x",
683 ((tc
>> 4) & 0x0f) & (0x0f << (4 - b
)));
685 dn
+= sprintf(dn
, "/%d]", blen
);
692 * irc_ns_name_pton(src, dst, dstsiz)
693 * Convert a ascii string into an encoded domain name as per RFC1035.
696 * 1 if string was fully qualified
697 * 0 is string was not fully qualified
699 * Enforces label and domain length limits.
702 irc_ns_name_pton(const char *src
, unsigned char *dst
, size_t dstsiz
)
704 unsigned char *label
, *bp
, *eom
;
706 int c
, n
, escaped
, e
= 0;
714 while ((c
= *src
++) != 0) {
716 if (c
== '[') { /* start a bit string label */
717 if ((cp
= strchr(src
, ']')) == NULL
) {
718 errno
= EINVAL
; /* ??? */
721 if ((e
= irc_encode_bitsring(&src
,
732 if ((c
= *src
++) == 0)
740 else if ((cp
= strchr(digits
, c
)) != NULL
) {
741 n
= (cp
- digits
) * 100;
742 if ((c
= *src
++) == 0 ||
743 (cp
= strchr(digits
, c
)) == NULL
) {
747 n
+= (cp
- digits
) * 10;
748 if ((c
= *src
++) == 0 ||
749 (cp
= strchr(digits
, c
)) == NULL
) {
761 } else if (c
== '\\') {
764 } else if (c
== '.') {
765 c
= (bp
- label
- 1);
766 if ((c
& NS_CMPRSFLGS
) != 0) { /* Label too big. */
775 /* Fully qualified ? */
784 if ((bp
- dst
) > NS_MAXCDNAME
) {
790 if (c
== 0 || *src
== '.') {
801 *bp
++ = (unsigned char)c
;
803 c
= (bp
- label
- 1);
804 if ((c
& NS_CMPRSFLGS
) != 0) { /* Label too big. */
822 if ((bp
- dst
) > NS_MAXCDNAME
)
832 * irc_ns_name_pack(src, dst, dstsiz, dnptrs, lastdnptr)
833 * Pack domain name 'domain' into 'comp_dn'.
835 * Size of the compressed name, or -1.
837 * 'dnptrs' is an array of pointers to previous compressed names.
838 * dnptrs[0] is a pointer to the beginning of the message. The array
840 * 'lastdnptr' is a pointer to the end of the array pointed to
843 * The list of pointers in dnptrs is updated for labels inserted into
844 * the message as we compress the name. If 'dnptr' is NULL, we don't
845 * try to compress names. If 'lastdnptr' is NULL, we don't update the
849 irc_ns_name_pack(const unsigned char *src
, unsigned char *dst
, int dstsiz
,
850 const unsigned char **dnptrs
, const unsigned char **lastdnptr
)
853 const unsigned char **cpp
, **lpp
, *eob
, *msg
;
854 const unsigned char *srcp
;
861 if (dnptrs
!= NULL
) {
862 if ((msg
= *dnptrs
++) != NULL
) {
863 for (cpp
= dnptrs
; *cpp
!= NULL
; cpp
++)
865 lpp
= cpp
; /* end of list to search */
870 /* make sure the domain we are about to add is legal */
876 if ((n
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
) {
880 if ((l0
= labellen(srcp
)) < 0) {
885 if (l
> NS_MAXCDNAME
) {
892 /* from here on we need to reset compression pointer array on error */
895 /* Look to see if we can use pointers. */
897 if (n
!= 0 && msg
!= NULL
) {
898 l
= irc_dn_find(srcp
, msg
, (const unsigned char * const *)dnptrs
,
899 (const unsigned char * const *)lpp
);
901 if (dstp
+ 1 >= eob
) {
904 *dstp
++ = (l
>> 8) | NS_CMPRSFLGS
;
908 /* Not found, save it. */
909 if (lastdnptr
!= NULL
&& cpp
< lastdnptr
- 1 &&
910 (dstp
- msg
) < 0x4000 && first
) {
916 /* copy label to buffer */
917 if ((n
& NS_CMPRSFLGS
) == NS_CMPRSFLGS
) {
918 /* Should not happen. */
922 if (dstp
+ 1 + n
>= eob
) {
925 memcpy(dstp
, srcp
, n
+ 1);
941 irc_ns_name_compress(const char *src
, unsigned char *dst
, size_t dstsiz
,
942 const unsigned char **dnptrs
, const unsigned char **lastdnptr
)
944 unsigned char tmp
[NS_MAXCDNAME
];
946 if (irc_ns_name_pton(src
, tmp
, sizeof tmp
) == -1)
948 return(irc_ns_name_pack(tmp
, dst
, dstsiz
, dnptrs
, lastdnptr
));
952 irc_encode_bitsring(const char **bp
, const char *end
, unsigned char **labelp
,
953 unsigned char **dst
, const char *eom
)
956 const char *cp
= *bp
;
958 const char *beg_blen
;
959 char *end_blen
= NULL
;
960 int value
= 0, count
= 0, tbcount
= 0, blen
= 0;
962 beg_blen
= end_blen
= NULL
;
964 /* a bitstring must contain at least 2 characters */
968 /* XXX: currently, only hex strings are supported */
971 if (!isxdigit((*cp
) & 0xff)) /* reject '\[x/BLEN]' */
974 for (tp
= (char*)(dst
+ 1); cp
< end
&& tp
< eom
; cp
++) {
976 case ']': /* end of the bitstring */
978 if (beg_blen
== NULL
)
980 blen
= (int)strtol(beg_blen
, &end_blen
, 10);
981 if (*end_blen
!= ']')
985 *tp
++ = ((value
<< 4) & 0xff);
993 if (!isdigit(c
&0xff))
995 if (beg_blen
== NULL
) {
998 /* blen never begings with 0 */
1004 if (!isxdigit(c
&0xff))
1007 value
+= digitvalue
[(int)c
];
1021 if (cp
>= end
|| tp
>= eom
)
1025 * bit length validation:
1026 * If a <length> is present, the number of digits in the <bit-data>
1027 * MUST be just sufficient to contain the number of bits specified
1028 * by the <length>. If there are insignificant bits in a final
1029 * hexadecimal or octal digit, they MUST be zero.
1030 * RFC 2673, Section 3.2.
1035 if (((blen
+ 3) & ~3) != tbcount
)
1037 traillen
= tbcount
- blen
; /* between 0 and 3 */
1038 if (((value
<< (8 - traillen
)) & 0xff) != 0)
1046 /* encode the type and the significant bit fields */
1047 **labelp
= DNS_LABELTYPE_BITSTRING
;
1051 *dst
= (unsigned char*)tp
;
1057 * dn_find(domain, msg, dnptrs, lastdnptr)
1058 * Search for the counted-label name in an array of compressed names.
1060 * offset from msg if found, or -1.
1062 * dnptrs is the pointer to the first name on the list,
1063 * not the pointer to the start of the message.
1066 irc_dn_find(const unsigned char *domain
, const unsigned char *msg
,
1067 const unsigned char * const *dnptrs
,
1068 const unsigned char * const *lastdnptr
)
1070 const unsigned char *dn
, *cp
, *sp
;
1071 const unsigned char * const *cpp
;
1074 for (cpp
= dnptrs
; cpp
< lastdnptr
; cpp
++)
1078 * terminate search on:
1080 * compression pointer
1083 while (*sp
!= 0 && (*sp
& NS_CMPRSFLGS
) == 0 &&
1084 (sp
- msg
) < 0x4000) {
1087 while ((n
= *cp
++) != 0) {
1089 * check for indirection
1091 switch (n
& NS_CMPRSFLGS
) {
1092 case 0: /* normal case, n == len */
1093 n
= labellen(cp
- 1); /* XXX */
1098 for ((void)NULL
; n
> 0; n
--)
1099 if (mklower(*dn
++) !=
1102 /* Is next root for both ? */
1103 if (*dn
== '\0' && *cp
== '\0')
1108 case NS_CMPRSFLGS
: /* indirection */
1109 cp
= msg
+ (((n
& 0x3f) << 8) | *cp
);
1112 default: /* illegal type */
1126 * Thinking in noninternationalized USASCII (per the DNS spec),
1127 * convert this character to lower case if it's upper case.
1132 if (ch
>= 0x41 && ch
<= 0x5A)
1138 /* From resolv/mkquery.c */
1141 * Form all types of queries.
1142 * Returns the size of the result or -1.
1146 const char *dname
, /* domain name */
1147 int class, int type
, /* class and type of query */
1148 unsigned char *buf
, /* buffer to put query */
1149 int buflen
) /* size of buffer */
1154 const unsigned char *dnptrs
[20], **dpp
, **lastdnptr
;
1157 * Initialize header fields.
1159 if ((buf
== NULL
) || (buflen
< HFIXEDSZ
))
1161 memset(buf
, 0, HFIXEDSZ
);
1162 hp
= (HEADER
*)(void *)buf
;
1166 hp
->rd
= 1; /* recurse */
1167 hp
->rcode
= NO_ERRORS
;
1168 cp
= buf
+ HFIXEDSZ
;
1173 lastdnptr
= dnptrs
+ sizeof dnptrs
/ sizeof dnptrs
[0];
1175 if ((buflen
-= QFIXEDSZ
) < 0)
1177 if ((n
= irc_dn_comp(dname
, cp
, buflen
, dnptrs
, lastdnptr
)) < 0)
1182 IRC_NS_PUT16(type
, cp
);
1183 IRC_NS_PUT16(class, cp
);
1184 hp
->qdcount
= htons(1);