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adx |
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/* |
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* Copyright (c) 1985, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* This product includes software developed by the University of |
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* California, Berkeley and its contributors. |
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* 4. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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/* |
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* Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies, and that |
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* the name of Digital Equipment Corporation not be used in advertising or |
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* publicity pertaining to distribution of the document or software without |
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* specific, written prior permission. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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* SOFTWARE. |
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*/ |
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/* |
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* Portions Copyright (c) 1996-1999 by Internet Software Consortium. |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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* SOFTWARE. |
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*/ |
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/* Original copyright ISC as above. |
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* Code modified specifically for ircd use from the following orginal files |
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* in bind ... |
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* |
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* res_comp.c |
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* ns_name.c |
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* ns_netint.c |
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* res_init.c |
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* |
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* - Dianora |
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*/ |
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#include "stdinc.h" |
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#include "irc_reslib.h" |
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#include "irc_res.h" |
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#include "ircd_defs.h" |
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#include "fileio.h" |
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#include "irc_string.h" |
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#include "irc_getaddrinfo.h" |
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#define NS_TYPE_ELT 0x40 /* EDNS0 extended label type */ |
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#define DNS_LABELTYPE_BITSTRING 0x41 |
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#define MAXLINE 128 |
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/* $Id: irc_reslib.c,v 7.26 2005/07/26 03:33:04 adx Exp $ */ |
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struct irc_ssaddr irc_nsaddr_list[IRCD_MAXNS]; |
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int irc_nscount = 0; |
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char irc_domain[HOSTLEN + 1]; |
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static const char digitvalue[256] = { |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*16*/ |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*32*/ |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*48*/ |
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /*64*/ |
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-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*80*/ |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*96*/ |
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-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*112*/ |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*128*/ |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, |
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /*256*/ |
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}; |
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static int parse_resvconf(void); |
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static void add_nameserver(char *arg); |
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static const char digits[] = "0123456789"; |
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static int labellen(const unsigned char *lp); |
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static int special(int ch); |
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static int printable(int ch); |
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static int irc_decode_bitstring(const char **cpp, char *dn, const char *eom); |
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static int irc_ns_name_compress(const char *src, unsigned char *dst, size_t dstsiz, |
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const unsigned char **dnptrs, const unsigned char **lastdnptr); |
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static int irc_dn_find(const unsigned char *, const unsigned char *, const unsigned char * const *, |
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const unsigned char * const *); |
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static int irc_encode_bitsring(const char **, const char *, unsigned char **, unsigned char **, |
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const char *); |
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static int irc_ns_name_uncompress(const unsigned char *, const unsigned char *, |
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const unsigned char *, char *, size_t); |
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static int irc_ns_name_unpack(const unsigned char *, const unsigned char *, |
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const unsigned char *, unsigned char *, |
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size_t); |
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static int irc_ns_name_ntop(const char *, char *, size_t); |
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static int irc_ns_name_skip(const unsigned char **, const unsigned char *); |
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static int mklower(int ch); |
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int |
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irc_res_init(void) |
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{ |
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irc_nscount = 0; |
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return parse_resvconf(); |
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} |
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/* parse_resvconf() |
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* |
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* inputs - NONE |
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* output - -1 if failure 0 if success |
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* side effects - fills in irc_nsaddr_list |
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*/ |
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static int |
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parse_resvconf(void) |
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{ |
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char *p; |
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char *opt; |
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char *arg; |
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char input[MAXLINE]; |
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FBFILE *file; |
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/* XXX "/etc/resolv.conf" should be from a define in setup.h perhaps |
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* for cygwin support etc. this hardcodes it to unix for now -db |
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*/ |
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if ((file = fbopen("/etc/resolv.conf", "r")) == NULL) |
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return(-1); |
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while (fbgets(input, MAXLINE, file) != NULL) |
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{ |
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/* blow away any newline */ |
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if ((p = strpbrk(input, "\r\n")) != NULL) |
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*p = '\0'; |
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/* Ignore comment lines immediately */ |
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if (*input == '#') |
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continue; |
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p = input; |
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/* skip until something thats not a space is seen */ |
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while (IsSpace(*p)) |
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p++; |
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/* if at this point, have a '\0' then continue */ |
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if (*p == '\0') |
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continue; |
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/* skip until a space is found */ |
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opt = input; |
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while (!IsSpace(*p)) |
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if (*p++ == '\0') |
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continue; /* no arguments?.. ignore this line */ |
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/* blow away the space character */ |
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*p++ = '\0'; |
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/* skip these spaces that are before the argument */ |
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while (IsSpace(*p)) |
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p++; |
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/* Now arg should be right where p is pointing */ |
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arg = p; |
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if ((p = strpbrk(arg, " \t")) != NULL) |
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*p = '\0'; /* take the first word */ |
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if (irccmp(opt, "domain") == 0) |
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strlcpy(irc_domain, arg, HOSTLEN); |
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else if (irccmp(opt, "nameserver") == 0) |
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add_nameserver(arg); |
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} |
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fbclose(file); |
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return(0); |
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} |
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/* add_nameserver() |
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* |
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* input - either an IPV4 address in dotted quad |
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* or an IPV6 address in : format |
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* output - NONE |
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* side effects - entry in irc_nsaddr_list is filled in as needed |
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*/ |
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static void |
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add_nameserver(char *arg) |
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{ |
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struct addrinfo hints, *res; |
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/* Done max number of nameservers? */ |
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if ((irc_nscount) >= IRCD_MAXNS) |
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return; |
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_family = PF_UNSPEC; |
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hints.ai_socktype = SOCK_DGRAM; |
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hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
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if (irc_getaddrinfo(arg, "domain", &hints, &res)) |
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return; |
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238 |
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if (res == NULL) |
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return; |
240 |
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memcpy(&irc_nsaddr_list[irc_nscount].ss, res->ai_addr, res->ai_addrlen); |
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irc_nsaddr_list[irc_nscount].ss_len = res->ai_addrlen; |
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irc_nscount++; |
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irc_freeaddrinfo(res); |
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} |
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247 |
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/* |
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* Expand compressed domain name 'comp_dn' to full domain name. |
249 |
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* 'msg' is a pointer to the begining of the message, |
250 |
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* 'eomorig' points to the first location after the message, |
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* 'exp_dn' is a pointer to a buffer of size 'length' for the result. |
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* Return size of compressed name or -1 if there was an error. |
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*/ |
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int |
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irc_dn_expand(const unsigned char *msg, const unsigned char *eom, |
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const unsigned char *src, char *dst, int dstsiz) |
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{ |
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int n = irc_ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); |
259 |
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260 |
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if (n > 0 && dst[0] == '.') |
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dst[0] = '\0'; |
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return(n); |
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} |
264 |
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265 |
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/* |
266 |
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* irc_ns_name_uncompress(msg, eom, src, dst, dstsiz) |
267 |
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* Expand compressed domain name to presentation format. |
268 |
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* return: |
269 |
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* Number of bytes read out of `src', or -1 (with errno set). |
270 |
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* note: |
271 |
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* Root domain returns as "." not "". |
272 |
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*/ |
273 |
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static int |
274 |
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irc_ns_name_uncompress(const unsigned char *msg, const unsigned char *eom, |
275 |
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const unsigned char *src, char *dst, size_t dstsiz) |
276 |
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{ |
277 |
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unsigned char tmp[NS_MAXCDNAME]; |
278 |
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int n; |
279 |
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280 |
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if ((n = irc_ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1) |
281 |
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return(-1); |
282 |
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if (irc_ns_name_ntop((char*)tmp, dst, dstsiz) == -1) |
283 |
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return(-1); |
284 |
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return(n); |
285 |
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} |
286 |
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/* |
287 |
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* irc_ns_name_unpack(msg, eom, src, dst, dstsiz) |
288 |
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* Unpack a domain name from a message, source may be compressed. |
289 |
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* return: |
290 |
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* -1 if it fails, or consumed octets if it succeeds. |
291 |
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*/ |
292 |
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static int |
293 |
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irc_ns_name_unpack(const unsigned char *msg, const unsigned char *eom, |
294 |
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const unsigned char *src, unsigned char *dst, |
295 |
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size_t dstsiz) |
296 |
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{ |
297 |
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const unsigned char *srcp, *dstlim; |
298 |
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unsigned char *dstp; |
299 |
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int n, len, checked, l; |
300 |
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301 |
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len = -1; |
302 |
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checked = 0; |
303 |
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dstp = dst; |
304 |
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srcp = src; |
305 |
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dstlim = dst + dstsiz; |
306 |
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if (srcp < msg || srcp >= eom) { |
307 |
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errno = EMSGSIZE; |
308 |
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return (-1); |
309 |
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} |
310 |
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/* Fetch next label in domain name. */ |
311 |
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while ((n = *srcp++) != 0) { |
312 |
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/* Check for indirection. */ |
313 |
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switch (n & NS_CMPRSFLGS) { |
314 |
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case 0: |
315 |
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case NS_TYPE_ELT: |
316 |
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/* Limit checks. */ |
317 |
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if ((l = labellen(srcp - 1)) < 0) { |
318 |
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errno = EMSGSIZE; |
319 |
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return(-1); |
320 |
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} |
321 |
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if (dstp + l + 1 >= dstlim || srcp + l >= eom) { |
322 |
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errno = EMSGSIZE; |
323 |
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return (-1); |
324 |
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} |
325 |
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checked += l + 1; |
326 |
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*dstp++ = n; |
327 |
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memcpy(dstp, srcp, l); |
328 |
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dstp += l; |
329 |
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srcp += l; |
330 |
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break; |
331 |
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|
332 |
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case NS_CMPRSFLGS: |
333 |
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if (srcp >= eom) { |
334 |
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errno = EMSGSIZE; |
335 |
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return (-1); |
336 |
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} |
337 |
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if (len < 0) |
338 |
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len = srcp - src + 1; |
339 |
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srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff)); |
340 |
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if (srcp < msg || srcp >= eom) { /* Out of range. */ |
341 |
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errno = EMSGSIZE; |
342 |
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return (-1); |
343 |
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} |
344 |
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checked += 2; |
345 |
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/* |
346 |
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* Check for loops in the compressed name; |
347 |
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* if we've looked at the whole message, |
348 |
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* there must be a loop. |
349 |
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*/ |
350 |
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if (checked >= eom - msg) { |
351 |
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|
errno = EMSGSIZE; |
352 |
|
|
return (-1); |
353 |
|
|
} |
354 |
|
|
break; |
355 |
|
|
|
356 |
|
|
default: |
357 |
|
|
errno = EMSGSIZE; |
358 |
|
|
return (-1); /* flag error */ |
359 |
|
|
} |
360 |
|
|
} |
361 |
|
|
*dstp = '\0'; |
362 |
|
|
if (len < 0) |
363 |
|
|
len = srcp - src; |
364 |
|
|
return (len); |
365 |
|
|
} |
366 |
|
|
|
367 |
|
|
/* |
368 |
|
|
* irc_ns_name_ntop(src, dst, dstsiz) |
369 |
|
|
* Convert an encoded domain name to printable ascii as per RFC1035. |
370 |
|
|
* return: |
371 |
|
|
* Number of bytes written to buffer, or -1 (with errno set) |
372 |
|
|
* notes: |
373 |
|
|
* The root is returned as "." |
374 |
|
|
* All other domains are returned in non absolute form |
375 |
|
|
*/ |
376 |
|
|
static int |
377 |
|
|
irc_ns_name_ntop(const char *src, char *dst, size_t dstsiz) |
378 |
|
|
{ |
379 |
|
|
const char *cp; |
380 |
|
|
char *dn, *eom; |
381 |
|
|
unsigned char c; |
382 |
|
|
unsigned int n; |
383 |
|
|
int l; |
384 |
|
|
|
385 |
|
|
cp = src; |
386 |
|
|
dn = dst; |
387 |
|
|
eom = dst + dstsiz; |
388 |
|
|
|
389 |
|
|
while ((n = *cp++) != 0) { |
390 |
|
|
if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) { |
391 |
|
|
/* Some kind of compression pointer. */ |
392 |
|
|
errno = EMSGSIZE; |
393 |
|
|
return (-1); |
394 |
|
|
} |
395 |
|
|
if (dn != dst) { |
396 |
|
|
if (dn >= eom) { |
397 |
|
|
errno = EMSGSIZE; |
398 |
|
|
return (-1); |
399 |
|
|
} |
400 |
|
|
*dn++ = '.'; |
401 |
|
|
} |
402 |
|
|
if ((l = labellen((unsigned char*)(cp - 1))) < 0) { |
403 |
|
|
errno = EMSGSIZE; /* XXX */ |
404 |
|
|
return(-1); |
405 |
|
|
} |
406 |
|
|
if (dn + l >= eom) { |
407 |
|
|
errno = EMSGSIZE; |
408 |
|
|
return (-1); |
409 |
|
|
} |
410 |
|
|
if ((n & NS_CMPRSFLGS) == NS_TYPE_ELT) { |
411 |
|
|
int m; |
412 |
|
|
|
413 |
|
|
if (n != DNS_LABELTYPE_BITSTRING) { |
414 |
|
|
/* XXX: labellen should reject this case */ |
415 |
|
|
errno = EINVAL; |
416 |
|
|
return(-1); |
417 |
|
|
} |
418 |
|
|
if ((m = irc_decode_bitstring(&cp, dn, eom)) < 0) |
419 |
|
|
{ |
420 |
|
|
errno = EMSGSIZE; |
421 |
|
|
return(-1); |
422 |
|
|
} |
423 |
|
|
dn += m; |
424 |
|
|
continue; |
425 |
|
|
} |
426 |
|
|
for ((void)NULL; l > 0; l--) { |
427 |
|
|
c = *cp++; |
428 |
|
|
if (special(c)) { |
429 |
|
|
if (dn + 1 >= eom) { |
430 |
|
|
errno = EMSGSIZE; |
431 |
|
|
return (-1); |
432 |
|
|
} |
433 |
|
|
*dn++ = '\\'; |
434 |
|
|
*dn++ = (char)c; |
435 |
|
|
} else if (!printable(c)) { |
436 |
|
|
if (dn + 3 >= eom) { |
437 |
|
|
errno = EMSGSIZE; |
438 |
|
|
return (-1); |
439 |
|
|
} |
440 |
|
|
*dn++ = '\\'; |
441 |
|
|
*dn++ = digits[c / 100]; |
442 |
|
|
*dn++ = digits[(c % 100) / 10]; |
443 |
|
|
*dn++ = digits[c % 10]; |
444 |
|
|
} else { |
445 |
|
|
if (dn >= eom) { |
446 |
|
|
errno = EMSGSIZE; |
447 |
|
|
return (-1); |
448 |
|
|
} |
449 |
|
|
*dn++ = (char)c; |
450 |
|
|
} |
451 |
|
|
} |
452 |
|
|
} |
453 |
|
|
if (dn == dst) { |
454 |
|
|
if (dn >= eom) { |
455 |
|
|
errno = EMSGSIZE; |
456 |
|
|
return (-1); |
457 |
|
|
} |
458 |
|
|
*dn++ = '.'; |
459 |
|
|
} |
460 |
|
|
if (dn >= eom) { |
461 |
|
|
errno = EMSGSIZE; |
462 |
|
|
return (-1); |
463 |
|
|
} |
464 |
|
|
*dn++ = '\0'; |
465 |
|
|
return (dn - dst); |
466 |
|
|
} |
467 |
|
|
|
468 |
|
|
/* |
469 |
|
|
* Pack domain name 'exp_dn' in presentation form into 'comp_dn'. |
470 |
|
|
* Return the size of the compressed name or -1. |
471 |
|
|
* 'length' is the size of the array pointed to by 'comp_dn'. |
472 |
|
|
*/ |
473 |
|
|
static int |
474 |
|
|
irc_dn_comp(const char *src, unsigned char *dst, int dstsiz, |
475 |
|
|
unsigned char **dnptrs, unsigned char **lastdnptr) |
476 |
|
|
{ |
477 |
|
|
return(irc_ns_name_compress(src, dst, (size_t)dstsiz, |
478 |
|
|
(const unsigned char **)dnptrs, |
479 |
|
|
(const unsigned char **)lastdnptr)); |
480 |
|
|
} |
481 |
|
|
|
482 |
|
|
/* |
483 |
|
|
* Skip over a compressed domain name. Return the size or -1. |
484 |
|
|
*/ |
485 |
|
|
int |
486 |
|
|
irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom) { |
487 |
|
|
const unsigned char *saveptr = ptr; |
488 |
|
|
|
489 |
|
|
if (irc_ns_name_skip(&ptr, eom) == -1) |
490 |
|
|
return(-1); |
491 |
|
|
return(ptr - saveptr); |
492 |
|
|
} |
493 |
|
|
|
494 |
|
|
/* |
495 |
|
|
* ns_name_skip(ptrptr, eom) |
496 |
|
|
* Advance *ptrptr to skip over the compressed name it points at. |
497 |
|
|
* return: |
498 |
|
|
* 0 on success, -1 (with errno set) on failure. |
499 |
|
|
*/ |
500 |
|
|
static int |
501 |
|
|
irc_ns_name_skip(const unsigned char **ptrptr, const unsigned char *eom) |
502 |
|
|
{ |
503 |
|
|
const unsigned char *cp; |
504 |
|
|
unsigned int n; |
505 |
|
|
int l; |
506 |
|
|
|
507 |
|
|
cp = *ptrptr; |
508 |
|
|
|
509 |
|
|
while (cp < eom && (n = *cp++) != 0) |
510 |
|
|
{ |
511 |
|
|
/* Check for indirection. */ |
512 |
|
|
switch (n & NS_CMPRSFLGS) |
513 |
|
|
{ |
514 |
|
|
case 0: /* normal case, n == len */ |
515 |
|
|
cp += n; |
516 |
|
|
continue; |
517 |
|
|
case NS_TYPE_ELT: /* EDNS0 extended label */ |
518 |
|
|
if ((l = labellen(cp - 1)) < 0) |
519 |
|
|
{ |
520 |
|
|
errno = EMSGSIZE; /* XXX */ |
521 |
|
|
return(-1); |
522 |
|
|
} |
523 |
|
|
|
524 |
|
|
cp += l; |
525 |
|
|
continue; |
526 |
|
|
case NS_CMPRSFLGS: /* indirection */ |
527 |
|
|
cp++; |
528 |
|
|
break; |
529 |
|
|
default: /* illegal type */ |
530 |
|
|
errno = EMSGSIZE; |
531 |
|
|
return(-1); |
532 |
|
|
} |
533 |
|
|
|
534 |
|
|
break; |
535 |
|
|
} |
536 |
|
|
|
537 |
|
|
if (cp > eom) |
538 |
|
|
{ |
539 |
|
|
errno = EMSGSIZE; |
540 |
|
|
return (-1); |
541 |
|
|
} |
542 |
|
|
|
543 |
|
|
*ptrptr = cp; |
544 |
|
|
return(0); |
545 |
|
|
} |
546 |
|
|
|
547 |
|
|
unsigned int |
548 |
|
|
irc_ns_get16(const unsigned char *src) |
549 |
|
|
{ |
550 |
|
|
unsigned int dst; |
551 |
|
|
|
552 |
|
|
IRC_NS_GET16(dst, src); |
553 |
|
|
return(dst); |
554 |
|
|
} |
555 |
|
|
|
556 |
|
|
unsigned long |
557 |
|
|
irc_ns_get32(const unsigned char *src) |
558 |
|
|
{ |
559 |
|
|
unsigned long dst; |
560 |
|
|
|
561 |
|
|
IRC_NS_GET32(dst, src); |
562 |
|
|
return(dst); |
563 |
|
|
} |
564 |
|
|
|
565 |
|
|
void |
566 |
|
|
irc_ns_put16(unsigned int src, unsigned char *dst) |
567 |
|
|
{ |
568 |
|
|
IRC_NS_PUT16(src, dst); |
569 |
|
|
} |
570 |
|
|
|
571 |
|
|
void |
572 |
|
|
irc_ns_put32(unsigned long src, unsigned char *dst) |
573 |
|
|
{ |
574 |
|
|
IRC_NS_PUT32(src, dst); |
575 |
|
|
} |
576 |
|
|
|
577 |
|
|
/* From ns_name.c */ |
578 |
|
|
|
579 |
|
|
/* |
580 |
|
|
* special(ch) |
581 |
|
|
* Thinking in noninternationalized USASCII (per the DNS spec), |
582 |
|
|
* is this characted special ("in need of quoting") ? |
583 |
|
|
* return: |
584 |
|
|
* boolean. |
585 |
|
|
*/ |
586 |
|
|
static int |
587 |
|
|
special(int ch) |
588 |
|
|
{ |
589 |
|
|
switch (ch) |
590 |
|
|
{ |
591 |
|
|
case 0x22: /* '"' */ |
592 |
|
|
case 0x2E: /* '.' */ |
593 |
|
|
case 0x3B: /* ';' */ |
594 |
|
|
case 0x5C: /* '\\' */ |
595 |
|
|
case 0x28: /* '(' */ |
596 |
|
|
case 0x29: /* ')' */ |
597 |
|
|
/* Special modifiers in zone files. */ |
598 |
|
|
case 0x40: /* '@' */ |
599 |
|
|
case 0x24: /* '$' */ |
600 |
|
|
return(1); |
601 |
|
|
default: |
602 |
|
|
return(0); |
603 |
|
|
} |
604 |
|
|
} |
605 |
|
|
|
606 |
|
|
static int |
607 |
|
|
labellen(const unsigned char *lp) |
608 |
|
|
{ |
609 |
|
|
int bitlen; |
610 |
|
|
unsigned char l = *lp; |
611 |
|
|
|
612 |
|
|
if ((l & NS_CMPRSFLGS) == NS_CMPRSFLGS) |
613 |
|
|
{ |
614 |
|
|
/* should be avoided by the caller */ |
615 |
|
|
return(-1); |
616 |
|
|
} |
617 |
|
|
|
618 |
|
|
if ((l & NS_CMPRSFLGS) == NS_TYPE_ELT) |
619 |
|
|
{ |
620 |
|
|
if (l == DNS_LABELTYPE_BITSTRING) |
621 |
|
|
{ |
622 |
|
|
if ((bitlen = *(lp + 1)) == 0) |
623 |
|
|
bitlen = 256; |
624 |
|
|
return((bitlen + 7 ) / 8 + 1); |
625 |
|
|
} |
626 |
|
|
|
627 |
|
|
return(-1); /* unknwon ELT */ |
628 |
|
|
} |
629 |
|
|
|
630 |
|
|
return(l); |
631 |
|
|
} |
632 |
|
|
|
633 |
|
|
|
634 |
|
|
/* |
635 |
|
|
* printable(ch) |
636 |
|
|
* Thinking in noninternationalized USASCII (per the DNS spec), |
637 |
|
|
* is this character visible and not a space when printed ? |
638 |
|
|
* return: |
639 |
|
|
* boolean. |
640 |
|
|
*/ |
641 |
|
|
static int |
642 |
|
|
printable(int ch) |
643 |
|
|
{ |
644 |
|
|
return(ch > 0x20 && ch < 0x7f); |
645 |
|
|
} |
646 |
|
|
|
647 |
|
|
static int |
648 |
|
|
irc_decode_bitstring(const char **cpp, char *dn, const char *eom) |
649 |
|
|
{ |
650 |
|
|
const char *cp = *cpp; |
651 |
|
|
char *beg = dn, tc; |
652 |
|
|
int b, blen, plen; |
653 |
|
|
|
654 |
|
|
if ((blen = (*cp & 0xff)) == 0) |
655 |
|
|
blen = 256; |
656 |
|
|
plen = (blen + 3) / 4; |
657 |
|
|
plen += sizeof("\\[x/]") + (blen > 99 ? 3 : (blen > 9) ? 2 : 1); |
658 |
|
|
if (dn + plen >= eom) |
659 |
|
|
return(-1); |
660 |
|
|
|
661 |
|
|
cp++; |
662 |
|
|
dn += sprintf(dn, "\\[x"); |
663 |
|
|
for (b = blen; b > 7; b -= 8, cp++) |
664 |
|
|
dn += sprintf(dn, "%02x", *cp & 0xff); |
665 |
|
|
if (b > 4) { |
666 |
|
|
tc = *cp++; |
667 |
|
|
dn += sprintf(dn, "%02x", tc & (0xff << (8 - b))); |
668 |
|
|
} else if (b > 0) { |
669 |
|
|
tc = *cp++; |
670 |
|
|
dn += sprintf(dn, "%1x", |
671 |
|
|
((tc >> 4) & 0x0f) & (0x0f << (4 - b))); |
672 |
|
|
} |
673 |
|
|
dn += sprintf(dn, "/%d]", blen); |
674 |
|
|
|
675 |
|
|
*cpp = cp; |
676 |
|
|
return(dn - beg); |
677 |
|
|
} |
678 |
|
|
|
679 |
|
|
/* |
680 |
|
|
* irc_ns_name_pton(src, dst, dstsiz) |
681 |
|
|
* Convert a ascii string into an encoded domain name as per RFC1035. |
682 |
|
|
* return: |
683 |
|
|
* -1 if it fails |
684 |
|
|
* 1 if string was fully qualified |
685 |
|
|
* 0 is string was not fully qualified |
686 |
|
|
* notes: |
687 |
|
|
* Enforces label and domain length limits. |
688 |
|
|
*/ |
689 |
|
|
static int |
690 |
|
|
irc_ns_name_pton(const char *src, unsigned char *dst, size_t dstsiz) |
691 |
|
|
{ |
692 |
|
|
unsigned char *label, *bp, *eom; |
693 |
|
|
char *cp; |
694 |
|
|
int c, n, escaped, e = 0; |
695 |
|
|
|
696 |
|
|
escaped = 0; |
697 |
|
|
bp = dst; |
698 |
|
|
eom = dst + dstsiz; |
699 |
|
|
label = bp++; |
700 |
|
|
|
701 |
|
|
|
702 |
|
|
while ((c = *src++) != 0) { |
703 |
|
|
if (escaped) { |
704 |
|
|
if (c == '[') { /* start a bit string label */ |
705 |
|
|
if ((cp = strchr(src, ']')) == NULL) { |
706 |
|
|
errno = EINVAL; /* ??? */ |
707 |
|
|
return(-1); |
708 |
|
|
} |
709 |
|
|
if ((e = irc_encode_bitsring(&src, |
710 |
|
|
cp + 2, |
711 |
|
|
&label, |
712 |
|
|
&bp, |
713 |
|
|
(const char *)eom)) |
714 |
|
|
!= 0) { |
715 |
|
|
errno = e; |
716 |
|
|
return(-1); |
717 |
|
|
} |
718 |
|
|
escaped = 0; |
719 |
|
|
label = bp++; |
720 |
|
|
if ((c = *src++) == 0) |
721 |
|
|
goto done; |
722 |
|
|
else if (c != '.') { |
723 |
|
|
errno = EINVAL; |
724 |
|
|
return(-1); |
725 |
|
|
} |
726 |
|
|
continue; |
727 |
|
|
} |
728 |
|
|
else if ((cp = strchr(digits, c)) != NULL) { |
729 |
|
|
n = (cp - digits) * 100; |
730 |
|
|
if ((c = *src++) == 0 || |
731 |
|
|
(cp = strchr(digits, c)) == NULL) { |
732 |
|
|
errno = EMSGSIZE; |
733 |
|
|
return (-1); |
734 |
|
|
} |
735 |
|
|
n += (cp - digits) * 10; |
736 |
|
|
if ((c = *src++) == 0 || |
737 |
|
|
(cp = strchr(digits, c)) == NULL) { |
738 |
|
|
errno = EMSGSIZE; |
739 |
|
|
return (-1); |
740 |
|
|
} |
741 |
|
|
n += (cp - digits); |
742 |
|
|
if (n > 255) { |
743 |
|
|
errno = EMSGSIZE; |
744 |
|
|
return (-1); |
745 |
|
|
} |
746 |
|
|
c = n; |
747 |
|
|
} |
748 |
|
|
escaped = 0; |
749 |
|
|
} else if (c == '\\') { |
750 |
|
|
escaped = 1; |
751 |
|
|
continue; |
752 |
|
|
} else if (c == '.') { |
753 |
|
|
c = (bp - label - 1); |
754 |
|
|
if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */ |
755 |
|
|
errno = EMSGSIZE; |
756 |
|
|
return (-1); |
757 |
|
|
} |
758 |
|
|
if (label >= eom) { |
759 |
|
|
errno = EMSGSIZE; |
760 |
|
|
return (-1); |
761 |
|
|
} |
762 |
|
|
*label = c; |
763 |
|
|
/* Fully qualified ? */ |
764 |
|
|
if (*src == '\0') { |
765 |
|
|
if (c != 0) { |
766 |
|
|
if (bp >= eom) { |
767 |
|
|
errno = EMSGSIZE; |
768 |
|
|
return (-1); |
769 |
|
|
} |
770 |
|
|
*bp++ = '\0'; |
771 |
|
|
} |
772 |
|
|
if ((bp - dst) > NS_MAXCDNAME) { |
773 |
|
|
errno = EMSGSIZE; |
774 |
|
|
return (-1); |
775 |
|
|
} |
776 |
|
|
return (1); |
777 |
|
|
} |
778 |
|
|
if (c == 0 || *src == '.') { |
779 |
|
|
errno = EMSGSIZE; |
780 |
|
|
return (-1); |
781 |
|
|
} |
782 |
|
|
label = bp++; |
783 |
|
|
continue; |
784 |
|
|
} |
785 |
|
|
if (bp >= eom) { |
786 |
|
|
errno = EMSGSIZE; |
787 |
|
|
return (-1); |
788 |
|
|
} |
789 |
|
|
*bp++ = (unsigned char)c; |
790 |
|
|
} |
791 |
|
|
c = (bp - label - 1); |
792 |
|
|
if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */ |
793 |
|
|
errno = EMSGSIZE; |
794 |
|
|
return (-1); |
795 |
|
|
} |
796 |
|
|
done: |
797 |
|
|
if (label >= eom) { |
798 |
|
|
errno = EMSGSIZE; |
799 |
|
|
return (-1); |
800 |
|
|
} |
801 |
|
|
*label = c; |
802 |
|
|
if (c != 0) { |
803 |
|
|
if (bp >= eom) { |
804 |
|
|
errno = EMSGSIZE; |
805 |
|
|
return (-1); |
806 |
|
|
} |
807 |
|
|
*bp++ = 0; |
808 |
|
|
} |
809 |
|
|
|
810 |
|
|
if ((bp - dst) > NS_MAXCDNAME) |
811 |
|
|
{ /* src too big */ |
812 |
|
|
errno = EMSGSIZE; |
813 |
|
|
return (-1); |
814 |
|
|
} |
815 |
|
|
|
816 |
|
|
return (0); |
817 |
|
|
} |
818 |
|
|
|
819 |
|
|
/* |
820 |
|
|
* irc_ns_name_pack(src, dst, dstsiz, dnptrs, lastdnptr) |
821 |
|
|
* Pack domain name 'domain' into 'comp_dn'. |
822 |
|
|
* return: |
823 |
|
|
* Size of the compressed name, or -1. |
824 |
|
|
* notes: |
825 |
|
|
* 'dnptrs' is an array of pointers to previous compressed names. |
826 |
|
|
* dnptrs[0] is a pointer to the beginning of the message. The array |
827 |
|
|
* ends with NULL. |
828 |
|
|
* 'lastdnptr' is a pointer to the end of the array pointed to |
829 |
|
|
* by 'dnptrs'. |
830 |
|
|
* Side effects: |
831 |
|
|
* The list of pointers in dnptrs is updated for labels inserted into |
832 |
|
|
* the message as we compress the name. If 'dnptr' is NULL, we don't |
833 |
|
|
* try to compress names. If 'lastdnptr' is NULL, we don't update the |
834 |
|
|
* list. |
835 |
|
|
*/ |
836 |
|
|
static int |
837 |
|
|
irc_ns_name_pack(const unsigned char *src, unsigned char *dst, int dstsiz, |
838 |
|
|
const unsigned char **dnptrs, const unsigned char **lastdnptr) |
839 |
|
|
{ |
840 |
|
|
unsigned char *dstp; |
841 |
|
|
const unsigned char **cpp, **lpp, *eob, *msg; |
842 |
|
|
const unsigned char *srcp; |
843 |
|
|
int n, l, first = 1; |
844 |
|
|
|
845 |
|
|
srcp = src; |
846 |
|
|
dstp = dst; |
847 |
|
|
eob = dstp + dstsiz; |
848 |
|
|
lpp = cpp = NULL; |
849 |
|
|
if (dnptrs != NULL) { |
850 |
|
|
if ((msg = *dnptrs++) != NULL) { |
851 |
|
|
for (cpp = dnptrs; *cpp != NULL; cpp++) |
852 |
|
|
(void)NULL; |
853 |
|
|
lpp = cpp; /* end of list to search */ |
854 |
|
|
} |
855 |
|
|
} else |
856 |
|
|
msg = NULL; |
857 |
|
|
|
858 |
|
|
/* make sure the domain we are about to add is legal */ |
859 |
|
|
l = 0; |
860 |
|
|
do { |
861 |
|
|
int l0; |
862 |
|
|
|
863 |
|
|
n = *srcp; |
864 |
|
|
if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) { |
865 |
|
|
errno = EMSGSIZE; |
866 |
|
|
return (-1); |
867 |
|
|
} |
868 |
|
|
if ((l0 = labellen(srcp)) < 0) { |
869 |
|
|
errno = EINVAL; |
870 |
|
|
return(-1); |
871 |
|
|
} |
872 |
|
|
l += l0 + 1; |
873 |
|
|
if (l > NS_MAXCDNAME) { |
874 |
|
|
errno = EMSGSIZE; |
875 |
|
|
return (-1); |
876 |
|
|
} |
877 |
|
|
srcp += l0 + 1; |
878 |
|
|
} while (n != 0); |
879 |
|
|
|
880 |
|
|
/* from here on we need to reset compression pointer array on error */ |
881 |
|
|
srcp = src; |
882 |
|
|
do { |
883 |
|
|
/* Look to see if we can use pointers. */ |
884 |
|
|
n = *srcp; |
885 |
|
|
if (n != 0 && msg != NULL) { |
886 |
|
|
l = irc_dn_find(srcp, msg, (const unsigned char * const *)dnptrs, |
887 |
|
|
(const unsigned char * const *)lpp); |
888 |
|
|
if (l >= 0) { |
889 |
|
|
if (dstp + 1 >= eob) { |
890 |
|
|
goto cleanup; |
891 |
|
|
} |
892 |
|
|
*dstp++ = (l >> 8) | NS_CMPRSFLGS; |
893 |
|
|
*dstp++ = l % 256; |
894 |
|
|
return (dstp - dst); |
895 |
|
|
} |
896 |
|
|
/* Not found, save it. */ |
897 |
|
|
if (lastdnptr != NULL && cpp < lastdnptr - 1 && |
898 |
|
|
(dstp - msg) < 0x4000 && first) { |
899 |
|
|
*cpp++ = dstp; |
900 |
|
|
*cpp = NULL; |
901 |
|
|
first = 0; |
902 |
|
|
} |
903 |
|
|
} |
904 |
|
|
/* copy label to buffer */ |
905 |
|
|
if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) { |
906 |
|
|
/* Should not happen. */ |
907 |
|
|
goto cleanup; |
908 |
|
|
} |
909 |
|
|
n = labellen(srcp); |
910 |
|
|
if (dstp + 1 + n >= eob) { |
911 |
|
|
goto cleanup; |
912 |
|
|
} |
913 |
|
|
memcpy(dstp, srcp, n + 1); |
914 |
|
|
srcp += n + 1; |
915 |
|
|
dstp += n + 1; |
916 |
|
|
} while (n != 0); |
917 |
|
|
|
918 |
|
|
if (dstp > eob) { |
919 |
|
|
cleanup: |
920 |
|
|
if (msg != NULL) |
921 |
|
|
*lpp = NULL; |
922 |
|
|
errno = EMSGSIZE; |
923 |
|
|
return (-1); |
924 |
|
|
} |
925 |
|
|
return(dstp - dst); |
926 |
|
|
} |
927 |
|
|
|
928 |
|
|
static int |
929 |
|
|
irc_ns_name_compress(const char *src, unsigned char *dst, size_t dstsiz, |
930 |
|
|
const unsigned char **dnptrs, const unsigned char **lastdnptr) |
931 |
|
|
{ |
932 |
|
|
unsigned char tmp[NS_MAXCDNAME]; |
933 |
|
|
|
934 |
|
|
if (irc_ns_name_pton(src, tmp, sizeof tmp) == -1) |
935 |
|
|
return(-1); |
936 |
|
|
return(irc_ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr)); |
937 |
|
|
} |
938 |
|
|
|
939 |
|
|
static int |
940 |
|
|
irc_encode_bitsring(const char **bp, const char *end, unsigned char **labelp, |
941 |
|
|
unsigned char **dst, const char *eom) |
942 |
|
|
{ |
943 |
|
|
int afterslash = 0; |
944 |
|
|
const char *cp = *bp; |
945 |
|
|
char *tp, c; |
946 |
|
|
const char *beg_blen; |
947 |
|
|
char *end_blen = NULL; |
948 |
|
|
int value = 0, count = 0, tbcount = 0, blen = 0; |
949 |
|
|
|
950 |
|
|
beg_blen = end_blen = NULL; |
951 |
|
|
|
952 |
|
|
/* a bitstring must contain at least 2 characters */ |
953 |
|
|
if (end - cp < 2) |
954 |
|
|
return(EINVAL); |
955 |
|
|
|
956 |
|
|
/* XXX: currently, only hex strings are supported */ |
957 |
|
|
if (*cp++ != 'x') |
958 |
|
|
return(EINVAL); |
959 |
|
|
if (!isxdigit((*cp) & 0xff)) /* reject '\[x/BLEN]' */ |
960 |
|
|
return(EINVAL); |
961 |
|
|
|
962 |
|
|
for (tp = (char*)(dst + 1); cp < end && tp < eom; cp++) { |
963 |
|
|
switch((c = *cp)) { |
964 |
|
|
case ']': /* end of the bitstring */ |
965 |
|
|
if (afterslash) { |
966 |
|
|
if (beg_blen == NULL) |
967 |
|
|
return(EINVAL); |
968 |
|
|
blen = (int)strtol(beg_blen, &end_blen, 10); |
969 |
|
|
if (*end_blen != ']') |
970 |
|
|
return(EINVAL); |
971 |
|
|
} |
972 |
|
|
if (count) |
973 |
|
|
*tp++ = ((value << 4) & 0xff); |
974 |
|
|
cp++; /* skip ']' */ |
975 |
|
|
goto done; |
976 |
|
|
case '/': |
977 |
|
|
afterslash = 1; |
978 |
|
|
break; |
979 |
|
|
default: |
980 |
|
|
if (afterslash) { |
981 |
|
|
if (!isdigit(c&0xff)) |
982 |
|
|
return(EINVAL); |
983 |
|
|
if (beg_blen == NULL) { |
984 |
|
|
|
985 |
|
|
if (c == '0') { |
986 |
|
|
/* blen never begings with 0 */ |
987 |
|
|
return(EINVAL); |
988 |
|
|
} |
989 |
|
|
beg_blen = cp; |
990 |
|
|
} |
991 |
|
|
} else { |
992 |
|
|
if (!isxdigit(c&0xff)) |
993 |
|
|
return(EINVAL); |
994 |
|
|
value <<= 4; |
995 |
|
|
value += digitvalue[(int)c]; |
996 |
|
|
count += 4; |
997 |
|
|
tbcount += 4; |
998 |
|
|
if (tbcount > 256) |
999 |
|
|
return(EINVAL); |
1000 |
|
|
if (count == 8) { |
1001 |
|
|
*tp++ = value; |
1002 |
|
|
count = 0; |
1003 |
|
|
} |
1004 |
|
|
} |
1005 |
|
|
break; |
1006 |
|
|
} |
1007 |
|
|
} |
1008 |
|
|
done: |
1009 |
|
|
if (cp >= end || tp >= eom) |
1010 |
|
|
return(EMSGSIZE); |
1011 |
|
|
|
1012 |
|
|
/* |
1013 |
|
|
* bit length validation: |
1014 |
|
|
* If a <length> is present, the number of digits in the <bit-data> |
1015 |
|
|
* MUST be just sufficient to contain the number of bits specified |
1016 |
|
|
* by the <length>. If there are insignificant bits in a final |
1017 |
|
|
* hexadecimal or octal digit, they MUST be zero. |
1018 |
|
|
* RFC 2673, Section 3.2. |
1019 |
|
|
*/ |
1020 |
|
|
if (blen > 0) { |
1021 |
|
|
int traillen; |
1022 |
|
|
|
1023 |
|
|
if (((blen + 3) & ~3) != tbcount) |
1024 |
|
|
return(EINVAL); |
1025 |
|
|
traillen = tbcount - blen; /* between 0 and 3 */ |
1026 |
|
|
if (((value << (8 - traillen)) & 0xff) != 0) |
1027 |
|
|
return(EINVAL); |
1028 |
|
|
} |
1029 |
|
|
else |
1030 |
|
|
blen = tbcount; |
1031 |
|
|
if (blen == 256) |
1032 |
|
|
blen = 0; |
1033 |
|
|
|
1034 |
|
|
/* encode the type and the significant bit fields */ |
1035 |
|
|
**labelp = DNS_LABELTYPE_BITSTRING; |
1036 |
|
|
**dst = blen; |
1037 |
|
|
|
1038 |
|
|
*bp = cp; |
1039 |
|
|
*dst = (unsigned char*)tp; |
1040 |
|
|
|
1041 |
|
|
return(0); |
1042 |
|
|
} |
1043 |
|
|
|
1044 |
|
|
/* |
1045 |
|
|
* dn_find(domain, msg, dnptrs, lastdnptr) |
1046 |
|
|
* Search for the counted-label name in an array of compressed names. |
1047 |
|
|
* return: |
1048 |
|
|
* offset from msg if found, or -1. |
1049 |
|
|
* notes: |
1050 |
|
|
* dnptrs is the pointer to the first name on the list, |
1051 |
|
|
* not the pointer to the start of the message. |
1052 |
|
|
*/ |
1053 |
|
|
static int |
1054 |
|
|
irc_dn_find(const unsigned char *domain, const unsigned char *msg, |
1055 |
|
|
const unsigned char * const *dnptrs, |
1056 |
|
|
const unsigned char * const *lastdnptr) |
1057 |
|
|
{ |
1058 |
|
|
const unsigned char *dn, *cp, *sp; |
1059 |
|
|
const unsigned char * const *cpp; |
1060 |
|
|
unsigned int n; |
1061 |
|
|
|
1062 |
|
|
for (cpp = dnptrs; cpp < lastdnptr; cpp++) |
1063 |
|
|
{ |
1064 |
|
|
sp = *cpp; |
1065 |
|
|
/* |
1066 |
|
|
* terminate search on: |
1067 |
|
|
* root label |
1068 |
|
|
* compression pointer |
1069 |
|
|
* unusable offset |
1070 |
|
|
*/ |
1071 |
|
|
while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 && |
1072 |
|
|
(sp - msg) < 0x4000) { |
1073 |
|
|
dn = domain; |
1074 |
|
|
cp = sp; |
1075 |
|
|
while ((n = *cp++) != 0) { |
1076 |
|
|
/* |
1077 |
|
|
* check for indirection |
1078 |
|
|
*/ |
1079 |
|
|
switch (n & NS_CMPRSFLGS) { |
1080 |
|
|
case 0: /* normal case, n == len */ |
1081 |
|
|
n = labellen(cp - 1); /* XXX */ |
1082 |
|
|
|
1083 |
|
|
if (n != *dn++) |
1084 |
|
|
goto next; |
1085 |
|
|
|
1086 |
|
|
for ((void)NULL; n > 0; n--) |
1087 |
|
|
if (mklower(*dn++) != |
1088 |
|
|
mklower(*cp++)) |
1089 |
|
|
goto next; |
1090 |
|
|
/* Is next root for both ? */ |
1091 |
|
|
if (*dn == '\0' && *cp == '\0') |
1092 |
|
|
return (sp - msg); |
1093 |
|
|
if (*dn) |
1094 |
|
|
continue; |
1095 |
|
|
goto next; |
1096 |
|
|
case NS_CMPRSFLGS: /* indirection */ |
1097 |
|
|
cp = msg + (((n & 0x3f) << 8) | *cp); |
1098 |
|
|
break; |
1099 |
|
|
|
1100 |
|
|
default: /* illegal type */ |
1101 |
|
|
errno = EMSGSIZE; |
1102 |
|
|
return (-1); |
1103 |
|
|
} |
1104 |
|
|
} |
1105 |
|
|
next: ; |
1106 |
|
|
sp += *sp + 1; |
1107 |
|
|
} |
1108 |
|
|
} |
1109 |
|
|
errno = ENOENT; |
1110 |
|
|
return (-1); |
1111 |
|
|
} |
1112 |
|
|
|
1113 |
|
|
/* |
1114 |
|
|
* * Thinking in noninternationalized USASCII (per the DNS spec), |
1115 |
|
|
* * convert this character to lower case if it's upper case. |
1116 |
|
|
* */ |
1117 |
|
|
static int |
1118 |
|
|
mklower(int ch) |
1119 |
|
|
{ |
1120 |
|
|
if (ch >= 0x41 && ch <= 0x5A) |
1121 |
|
|
return(ch + 0x20); |
1122 |
|
|
|
1123 |
|
|
return(ch); |
1124 |
|
|
} |
1125 |
|
|
|
1126 |
|
|
/* From resolv/mkquery.c */ |
1127 |
|
|
|
1128 |
|
|
/* |
1129 |
|
|
* Form all types of queries. |
1130 |
|
|
* Returns the size of the result or -1. |
1131 |
|
|
*/ |
1132 |
|
|
int |
1133 |
|
|
irc_res_mkquery( |
1134 |
|
|
const char *dname, /* domain name */ |
1135 |
|
|
int class, int type, /* class and type of query */ |
1136 |
|
|
unsigned char *buf, /* buffer to put query */ |
1137 |
|
|
int buflen) /* size of buffer */ |
1138 |
|
|
{ |
1139 |
|
|
HEADER *hp; |
1140 |
|
|
unsigned char *cp; |
1141 |
|
|
int n; |
1142 |
|
|
unsigned char *dnptrs[20], **dpp, **lastdnptr; |
1143 |
|
|
|
1144 |
|
|
/* |
1145 |
|
|
* Initialize header fields. |
1146 |
|
|
*/ |
1147 |
|
|
if ((buf == NULL) || (buflen < HFIXEDSZ)) |
1148 |
|
|
return (-1); |
1149 |
|
|
memset(buf, 0, HFIXEDSZ); |
1150 |
|
|
hp = (HEADER *) buf; |
1151 |
|
|
|
1152 |
|
|
hp->id = 0; |
1153 |
|
|
hp->opcode = QUERY; |
1154 |
|
|
hp->rd = 1; /* recurse */ |
1155 |
|
|
hp->rcode = NO_ERRORS; |
1156 |
|
|
cp = buf + HFIXEDSZ; |
1157 |
|
|
buflen -= HFIXEDSZ; |
1158 |
|
|
dpp = dnptrs; |
1159 |
|
|
*dpp++ = buf; |
1160 |
|
|
*dpp++ = NULL; |
1161 |
|
|
lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; |
1162 |
|
|
|
1163 |
|
|
if ((buflen -= QFIXEDSZ) < 0) |
1164 |
|
|
return (-1); |
1165 |
|
|
if ((n = irc_dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0) |
1166 |
|
|
return (-1); |
1167 |
|
|
|
1168 |
|
|
cp += n; |
1169 |
|
|
buflen -= n; |
1170 |
|
|
IRC_NS_PUT16(type, cp); |
1171 |
|
|
IRC_NS_PUT16(class, cp); |
1172 |
|
|
hp->qdcount = htons(1); |
1173 |
|
|
|
1174 |
|
|
return (cp - buf); |
1175 |
|
|
} |