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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
55 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
57 * Permission to use, copy, modify, and distribute this software for any
58 * purpose with or without fee is hereby granted, provided that the above
59 * copyright notice and this permission notice appear in all copies.
61 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
62 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
63 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
64 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
65 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
66 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
67 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
71 /* Original copyright ISC as above.
72 * Code modified specifically for ircd use from the following orginal files
85 #include "ircd_reslib.h"
86 #include "ircd_defs.h"
88 #include "ircd_string.h"
96 #define NS_TYPE_ELT 0x40 /* EDNS0 extended label type */
97 #define DNS_LABELTYPE_BITSTRING 0x41
102 struct irc_sockaddr irc_nsaddr_list[IRCD_MAXNS];
104 char irc_domain[HOSTLEN + 1];
106 static const char digitvalue[256] = {
107 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*16*/
108 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*32*/
109 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*48*/
110 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /*64*/
111 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*80*/
112 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*96*/
113 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*112*/
114 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*128*/
115 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
116 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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, /*256*/
125 static int parse_resvconf(void);
126 static void add_nameserver(char *arg);
128 static const char digits[] = "0123456789";
129 static int labellen(const unsigned char *lp);
130 static int special(int ch);
131 static int printable(int ch);
132 static int irc_decode_bitstring(const char **cpp, char *dn, const char *eom);
133 static int irc_ns_name_compress(const char *src, unsigned char *dst, size_t dstsiz,
134 const unsigned char **dnptrs, const unsigned char **lastdnptr);
135 static int irc_dn_find(const unsigned char *, const unsigned char *, const unsigned char * const *,
136 const unsigned char * const *);
137 static int irc_encode_bitsring(const char **, const char *, unsigned char **, unsigned char **,
139 static int mklower(int ch);
145 return(parse_resvconf());
151 * output - -1 if failure 0 if success
152 * side effects - fills in irc_nsaddr_list
163 /* XXX "/etc/resolv.conf" should be from a define in setup.h perhaps
164 * for cygwin support etc. this hardcodes it to unix for now -db
166 if ((file = fbopen("/etc/resolv.conf", "r")) == NULL)
169 while (fbgets(input, MAXLINE, file) != NULL)
171 /* blow away any newline */
172 if ((p = strpbrk(input, "\r\n")) != NULL)
175 /* Ignore comment lines immediately */
180 /* skip until something thats not a space is seen */
183 /* if at this point, have a '\0' then continue */
187 /* skip until a space is found */
191 continue; /* no arguments?.. ignore this line */
192 /* blow away the space character */
195 /* skip these spaces that are before the argument */
198 /* Now arg should be right where p is pointing */
200 if ((p = strpbrk(arg, " \t")) != NULL)
201 *p = '\0'; /* take the first word */
203 if (strcasecmp(opt, "domain") == 0)
204 ircd_strncpy(irc_domain, arg, HOSTLEN);
205 else if (strcasecmp(opt, "nameserver") == 0)
215 * input - either an IPV4 address in dotted quad
216 * or an IPV6 address in : format
218 * side effects - entry in irc_nsaddr_list is filled in as needed
221 add_nameserver(char *arg)
223 struct irc_sockaddr res;
225 /* Done max number of nameservers? */
226 if ((irc_nscount + 1) >= IRCD_MAXNS)
229 /* Failure converting from numeric string? */
230 if (!ircd_aton(&res.addr, arg))
233 memcpy(&irc_nsaddr_list[irc_nscount], &res, sizeof(irc_nsaddr_list[irc_nscount]));
238 * Expand compressed domain name 'comp_dn' to full domain name.
239 * 'msg' is a pointer to the begining of the message,
240 * 'eomorig' points to the first location after the message,
241 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
242 * Return size of compressed name or -1 if there was an error.
245 irc_dn_expand(const unsigned char *msg, const unsigned char *eom,
246 const unsigned char *src, char *dst, int dstsiz)
248 int n = irc_ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
250 if (n > 0 && dst[0] == '.')
256 * irc_ns_name_uncompress(msg, eom, src, dst, dstsiz)
257 * Expand compressed domain name to presentation format.
259 * Number of bytes read out of `src', or -1 (with errno set).
261 * Root domain returns as "." not "".
264 irc_ns_name_uncompress(const unsigned char *msg, const unsigned char *eom,
265 const unsigned char *src, char *dst, size_t dstsiz)
267 unsigned char tmp[NS_MAXCDNAME];
270 if ((n = irc_ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1)
272 if (irc_ns_name_ntop((char*)tmp, (char*)dst, dstsiz) == -1)
277 * irc_ns_name_unpack(msg, eom, src, dst, dstsiz)
278 * Unpack a domain name from a message, source may be compressed.
280 * -1 if it fails, or consumed octets if it succeeds.
283 irc_ns_name_unpack(const unsigned char *msg, const unsigned char *eom,
284 const unsigned char *src, unsigned char *dst,
287 const unsigned char *srcp, *dstlim;
289 int n, len, checked, l;
295 dstlim = dst + dstsiz;
296 if (srcp < msg || srcp >= eom) {
300 /* Fetch next label in domain name. */
301 while ((n = *srcp++) != 0) {
302 /* Check for indirection. */
303 switch (n & NS_CMPRSFLGS) {
307 if ((l = labellen(srcp - 1)) < 0) {
311 if (dstp + l + 1 >= dstlim || srcp + l >= eom) {
317 memcpy(dstp, srcp, l);
328 len = srcp - src + 1;
329 srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
330 if (srcp < msg || srcp >= eom) { /* Out of range. */
336 * Check for loops in the compressed name;
337 * if we've looked at the whole message,
338 * there must be a loop.
340 if (checked >= eom - msg) {
348 return (-1); /* flag error */
358 * irc_ns_name_ntop(src, dst, dstsiz)
359 * Convert an encoded domain name to printable ascii as per RFC1035.
361 * Number of bytes written to buffer, or -1 (with errno set)
363 * The root is returned as "."
364 * All other domains are returned in non absolute form
367 irc_ns_name_ntop(const char *src, char *dst, size_t dstsiz)
379 while ((n = *cp++) != 0) {
380 if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
381 /* Some kind of compression pointer. */
392 if ((l = labellen((const unsigned char*)(cp - 1))) < 0) {
393 errno = EMSGSIZE; /* XXX */
400 if ((n & NS_CMPRSFLGS) == NS_TYPE_ELT) {
403 if (n != DNS_LABELTYPE_BITSTRING) {
404 /* XXX: labellen should reject this case */
408 if ((m = irc_decode_bitstring(&cp, dn, eom)) < 0)
416 for ((void)NULL; l > 0; l--) {
425 } else if (!printable(c)) {
431 *dn++ = digits[c / 100];
432 *dn++ = digits[(c % 100) / 10];
433 *dn++ = digits[c % 10];
459 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
460 * Return the size of the compressed name or -1.
461 * 'length' is the size of the array pointed to by 'comp_dn'.
464 irc_dn_comp(const char *src, unsigned char *dst, int dstsiz,
465 unsigned char **dnptrs, unsigned char **lastdnptr)
467 return(irc_ns_name_compress(src, dst, (size_t)dstsiz,
468 (const unsigned char **)dnptrs,
469 (const unsigned char **)lastdnptr));
473 * Skip over a compressed domain name. Return the size or -1.
476 irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom) {
477 const unsigned char *saveptr = ptr;
479 if (irc_ns_name_skip(&ptr, eom) == -1)
481 return(ptr - saveptr);
485 * ns_name_skip(ptrptr, eom)
486 * Advance *ptrptr to skip over the compressed name it points at.
488 * 0 on success, -1 (with errno set) on failure.
491 irc_ns_name_skip(const unsigned char **ptrptr, const unsigned char *eom)
493 const unsigned char *cp;
499 while (cp < eom && (n = *cp++) != 0)
501 /* Check for indirection. */
502 switch (n & NS_CMPRSFLGS)
504 case 0: /* normal case, n == len */
507 case NS_TYPE_ELT: /* EDNS0 extended label */
508 if ((l = labellen(cp - 1)) < 0)
510 errno = EMSGSIZE; /* XXX */
516 case NS_CMPRSFLGS: /* indirection */
519 default: /* illegal type */
538 irc_ns_get16(const unsigned char *src)
542 IRC_NS_GET16(dst, src);
547 irc_ns_get32(const unsigned char *src)
551 IRC_NS_GET32(dst, src);
556 irc_ns_put16(unsigned int src, unsigned char *dst)
558 IRC_NS_PUT16(src, dst);
562 irc_ns_put32(unsigned long src, unsigned char *dst)
564 IRC_NS_PUT32(src, dst);
571 * Thinking in noninternationalized USASCII (per the DNS spec),
572 * is this characted special ("in need of quoting") ?
584 case 0x5C: /* '\\' */
587 /* Special modifiers in zone files. */
597 labellen(const unsigned char *lp)
600 unsigned char l = *lp;
602 if ((l & NS_CMPRSFLGS) == NS_CMPRSFLGS)
604 /* should be avoided by the caller */
608 if ((l & NS_CMPRSFLGS) == NS_TYPE_ELT)
610 if (l == DNS_LABELTYPE_BITSTRING)
612 if ((bitlen = *(lp + 1)) == 0)
614 return((bitlen + 7 ) / 8 + 1);
617 return(-1); /* unknwon ELT */
626 * Thinking in noninternationalized USASCII (per the DNS spec),
627 * is this character visible and not a space when printed ?
634 return(ch > 0x20 && ch < 0x7f);
638 irc_decode_bitstring(const char **cpp, char *dn, const char *eom)
640 const char *cp = *cpp;
644 if ((blen = (*cp & 0xff)) == 0)
646 plen = (blen + 3) / 4;
647 plen += sizeof("\\[x/]") + (blen > 99 ? 3 : (blen > 9) ? 2 : 1);
648 if (dn + plen >= eom)
652 dn += sprintf(dn, "\\[x");
653 for (b = blen; b > 7; b -= 8, cp++)
654 dn += sprintf(dn, "%02x", *cp & 0xff);
657 dn += sprintf(dn, "%02x", tc & (0xff << (8 - b)));
660 dn += sprintf(dn, "%1x",
661 ((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
663 dn += sprintf(dn, "/%d]", blen);
670 * irc_ns_name_pton(src, dst, dstsiz)
671 * Convert a ascii string into an encoded domain name as per RFC1035.
674 * 1 if string was fully qualified
675 * 0 is string was not fully qualified
677 * Enforces label and domain length limits.
680 irc_ns_name_pton(const char *src, unsigned char *dst, size_t dstsiz)
682 unsigned char *label, *bp, *eom;
684 int c, n, escaped, e = 0;
692 while ((c = *src++) != 0) {
694 if (c == '[') { /* start a bit string label */
695 if ((cp = strchr(src, ']')) == NULL) {
696 errno = EINVAL; /* ??? */
699 if ((e = irc_encode_bitsring(&src,
710 if ((c = *src++) == 0)
718 else if ((cp = strchr(digits, c)) != NULL) {
719 n = (cp - digits) * 100;
720 if ((c = *src++) == 0 ||
721 (cp = strchr(digits, c)) == NULL) {
725 n += (cp - digits) * 10;
726 if ((c = *src++) == 0 ||
727 (cp = strchr(digits, c)) == NULL) {
739 } else if (c == '\\') {
742 } else if (c == '.') {
743 c = (bp - label - 1);
744 if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
753 /* Fully qualified ? */
762 if ((bp - dst) > NS_MAXCDNAME) {
768 if (c == 0 || *src == '.') {
779 *bp++ = (unsigned char)c;
781 c = (bp - label - 1);
782 if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
800 if ((bp - dst) > NS_MAXCDNAME)
810 * irc_ns_name_pack(src, dst, dstsiz, dnptrs, lastdnptr)
811 * Pack domain name 'domain' into 'comp_dn'.
813 * Size of the compressed name, or -1.
815 * 'dnptrs' is an array of pointers to previous compressed names.
816 * dnptrs[0] is a pointer to the beginning of the message. The array
818 * 'lastdnptr' is a pointer to the end of the array pointed to
821 * The list of pointers in dnptrs is updated for labels inserted into
822 * the message as we compress the name. If 'dnptr' is NULL, we don't
823 * try to compress names. If 'lastdnptr' is NULL, we don't update the
827 irc_ns_name_pack(const unsigned char *src, unsigned char *dst, int dstsiz,
828 const unsigned char **dnptrs, const unsigned char **lastdnptr)
831 const unsigned char **cpp, **lpp, *eob, *msg;
832 const unsigned char *srcp;
839 if (dnptrs != NULL) {
840 if ((msg = *dnptrs++) != NULL) {
841 for (cpp = dnptrs; *cpp != NULL; cpp++)
843 lpp = cpp; /* end of list to search */
848 /* make sure the domain we are about to add is legal */
854 if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
858 if ((l0 = labellen(srcp)) < 0) {
863 if (l > NS_MAXCDNAME) {
870 /* from here on we need to reset compression pointer array on error */
873 /* Look to see if we can use pointers. */
875 if (n != 0 && msg != NULL) {
876 l = irc_dn_find(srcp, msg, (const unsigned char * const *)dnptrs,
877 (const unsigned char * const *)lpp);
879 if (dstp + 1 >= eob) {
882 *dstp++ = (l >> 8) | NS_CMPRSFLGS;
886 /* Not found, save it. */
887 if (lastdnptr != NULL && cpp < lastdnptr - 1 &&
888 (dstp - msg) < 0x4000 && first) {
894 /* copy label to buffer */
895 if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
896 /* Should not happen. */
900 if (dstp + 1 + n >= eob) {
903 memcpy(dstp, srcp, n + 1);
919 irc_ns_name_compress(const char *src, unsigned char *dst, size_t dstsiz,
920 const unsigned char **dnptrs, const unsigned char **lastdnptr)
922 unsigned char tmp[NS_MAXCDNAME];
924 if (irc_ns_name_pton(src, tmp, sizeof tmp) == -1)
926 return(irc_ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr));
930 irc_encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
931 unsigned char **dst, const char *eom)
934 const char *cp = *bp;
936 const char *beg_blen;
937 char *end_blen = NULL;
938 int value = 0, count = 0, tbcount = 0, blen = 0;
940 beg_blen = end_blen = NULL;
942 /* a bitstring must contain at least 2 characters */
946 /* XXX: currently, only hex strings are supported */
949 if (!isxdigit((*cp) & 0xff)) /* reject '\[x/BLEN]' */
952 for (tp = (char*)(*dst + 1); cp < end && tp < eom; cp++) {
954 case ']': /* end of the bitstring */
956 if (beg_blen == NULL)
958 blen = (int)strtol(beg_blen, &end_blen, 10);
959 if (*end_blen != ']')
963 *tp++ = ((value << 4) & 0xff);
971 if (!isdigit(c&0xff))
973 if (beg_blen == NULL) {
976 /* blen never begings with 0 */
982 if (!isxdigit(c&0xff))
985 value += digitvalue[(int)c];
999 if (cp >= end || tp >= eom)
1003 * bit length validation:
1004 * If a <length> is present, the number of digits in the <bit-data>
1005 * MUST be just sufficient to contain the number of bits specified
1006 * by the <length>. If there are insignificant bits in a final
1007 * hexadecimal or octal digit, they MUST be zero.
1008 * RFC 2673, Section 3.2.
1013 if (((blen + 3) & ~3) != tbcount)
1015 traillen = tbcount - blen; /* between 0 and 3 */
1016 if (((value << (8 - traillen)) & 0xff) != 0)
1024 /* encode the type and the significant bit fields */
1025 **labelp = DNS_LABELTYPE_BITSTRING;
1029 *dst = (unsigned char*)tp;
1035 * dn_find(domain, msg, dnptrs, lastdnptr)
1036 * Search for the counted-label name in an array of compressed names.
1038 * offset from msg if found, or -1.
1040 * dnptrs is the pointer to the first name on the list,
1041 * not the pointer to the start of the message.
1044 irc_dn_find(const unsigned char *domain, const unsigned char *msg,
1045 const unsigned char * const *dnptrs,
1046 const unsigned char * const *lastdnptr)
1048 const unsigned char *dn, *cp, *sp;
1049 const unsigned char * const *cpp;
1052 for (cpp = dnptrs; cpp < lastdnptr; cpp++)
1056 * terminate search on:
1058 * compression pointer
1061 while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 &&
1062 (sp - msg) < 0x4000) {
1065 while ((n = *cp++) != 0) {
1067 * check for indirection
1069 switch (n & NS_CMPRSFLGS) {
1070 case 0: /* normal case, n == len */
1071 n = labellen(cp - 1); /* XXX */
1076 for ((void)NULL; n > 0; n--)
1077 if (mklower(*dn++) !=
1080 /* Is next root for both ? */
1081 if (*dn == '\0' && *cp == '\0')
1086 case NS_CMPRSFLGS: /* indirection */
1087 cp = msg + (((n & 0x3f) << 8) | *cp);
1090 default: /* illegal type */
1104 * Thinking in noninternationalized USASCII (per the DNS spec),
1105 * convert this character to lower case if it's upper case.
1110 if (ch >= 0x41 && ch <= 0x5A)
1116 /* From resolv/mkquery.c */
1119 * Form all types of queries.
1120 * Returns the size of the result or -1.
1124 const char *dname, /* domain name */
1125 int class, int type, /* class and type of query */
1126 unsigned char *buf, /* buffer to put query */
1127 int buflen) /* size of buffer */
1132 unsigned char *dnptrs[20], **dpp, **lastdnptr;
1135 * Initialize header fields.
1137 if ((buf == NULL) || (buflen < HFIXEDSZ))
1139 memset(buf, 0, HFIXEDSZ);
1140 hp = (HEADER *) buf;
1144 hp->rd = 1; /* recurse */
1145 hp->rcode = NO_ERRORS;
1146 cp = buf + HFIXEDSZ;
1151 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
1153 if ((buflen -= QFIXEDSZ) < 0)
1155 if ((n = irc_dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
1160 IRC_NS_PUT16(type, cp);
1161 IRC_NS_PUT16(class, cp);
1162 hp->qdcount = htons(1);