mirror of
https://github.com/matrix-construct/construct
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1179 lines
29 KiB
C
1179 lines
29 KiB
C
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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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* 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 "ircd_defs.h"
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#include "common.h"
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#include "ircd.h"
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#include "res.h"
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#include "reslib.h"
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#include "match.h"
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#include "logger.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 DNS_MAXLINE 128
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/* $Id: reslib.c 1695 2006-06-27 15:11:23Z jilles $ */
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/* from Hybrid Id: reslib.c 177 2005-10-22 09:05:05Z michael $ */
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struct rb_sockaddr_storage irc_nsaddr_list[IRCD_MAXNS];
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int irc_nscount = 0;
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char irc_domain[IRCD_RES_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(const char *);
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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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parse_resvconf();
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if (irc_nscount == 0)
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add_nameserver("127.0.0.1");
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return 0;
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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[DNS_MAXLINE];
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FILE *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 = fopen("/etc/resolv.conf", "r")) == NULL)
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return -1;
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while (fgets(input, sizeof(input), 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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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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/* Ignore comment lines immediately */
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if (*p == '#' || *p == ';')
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continue;
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/* skip until a space is found */
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opt = p;
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while (!isspace(*p) && *p != '\0')
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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 (strcasecmp(opt, "domain") == 0)
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rb_strlcpy(irc_domain, arg, sizeof(irc_domain));
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else if (strcasecmp(opt, "nameserver") == 0)
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add_nameserver(arg);
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}
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fclose(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(const 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 (getaddrinfo(arg, "domain", &hints, &res))
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return;
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if (res == NULL)
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return;
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memcpy(&irc_nsaddr_list[irc_nscount], res->ai_addr, res->ai_addrlen);
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SET_SS_LEN(&irc_nsaddr_list[irc_nscount], res->ai_addrlen);
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irc_nscount++;
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freeaddrinfo(res);
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}
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/*
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* Expand compressed domain name 'comp_dn' to full domain name.
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* 'msg' is a pointer to the begining of the message,
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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);
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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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}
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/*
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* irc_ns_name_uncompress(msg, eom, src, dst, dstsiz)
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* Expand compressed domain name to presentation format.
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* return:
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* Number of bytes read out of `src', or -1 (with errno set).
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* note:
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* Root domain returns as "." not "".
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*/
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static int
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irc_ns_name_uncompress(const unsigned char *msg, const unsigned char *eom,
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const unsigned char *src, char *dst, size_t dstsiz)
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{
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unsigned char tmp[NS_MAXCDNAME];
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int n;
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if ((n = irc_ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1)
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return(-1);
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if (irc_ns_name_ntop((char*)tmp, dst, dstsiz) == -1)
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return(-1);
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return(n);
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}
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/*
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* irc_ns_name_unpack(msg, eom, src, dst, dstsiz)
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* Unpack a domain name from a message, source may be compressed.
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* return:
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* -1 if it fails, or consumed octets if it succeeds.
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*/
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static int
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irc_ns_name_unpack(const unsigned char *msg, const unsigned char *eom,
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const unsigned char *src, unsigned char *dst,
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size_t dstsiz)
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{
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const unsigned char *srcp, *dstlim;
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unsigned char *dstp;
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int n, len, checked, l;
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len = -1;
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checked = 0;
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dstp = dst;
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srcp = src;
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dstlim = dst + dstsiz;
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if (srcp < msg || srcp >= eom) {
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errno = EMSGSIZE;
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return (-1);
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}
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/* Fetch next label in domain name. */
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while ((n = *srcp++) != 0) {
|
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/* Check for indirection. */
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switch (n & NS_CMPRSFLGS) {
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case 0:
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case NS_TYPE_ELT:
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/* Limit checks. */
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if ((l = labellen(srcp - 1)) < 0) {
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errno = EMSGSIZE;
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return(-1);
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}
|
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if (dstp + l + 1 >= dstlim || srcp + l >= eom) {
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|
errno = EMSGSIZE;
|
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return (-1);
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}
|
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checked += l + 1;
|
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*dstp++ = n;
|
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memcpy(dstp, srcp, l);
|
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dstp += l;
|
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srcp += l;
|
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break;
|
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|
|
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case NS_CMPRSFLGS:
|
||
|
if (srcp >= eom) {
|
||
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errno = EMSGSIZE;
|
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|
return (-1);
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|
}
|
||
|
if (len < 0)
|
||
|
len = srcp - src + 1;
|
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srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
|
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if (srcp < msg || srcp >= eom) { /* Out of range. */
|
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errno = EMSGSIZE;
|
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return (-1);
|
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|
}
|
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checked += 2;
|
||
|
/*
|
||
|
* Check for loops in the compressed name;
|
||
|
* if we've looked at the whole message,
|
||
|
* there must be a loop.
|
||
|
*/
|
||
|
if (checked >= eom - msg) {
|
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errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
errno = EMSGSIZE;
|
||
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return (-1); /* flag error */
|
||
|
}
|
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}
|
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*dstp = '\0';
|
||
|
if (len < 0)
|
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|
len = srcp - src;
|
||
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return (len);
|
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|
}
|
||
|
|
||
|
/*
|
||
|
* irc_ns_name_ntop(src, dst, dstsiz)
|
||
|
* Convert an encoded domain name to printable ascii as per RFC1035.
|
||
|
* return:
|
||
|
* Number of bytes written to buffer, or -1 (with errno set)
|
||
|
* notes:
|
||
|
* The root is returned as "."
|
||
|
* All other domains are returned in non absolute form
|
||
|
*/
|
||
|
static int
|
||
|
irc_ns_name_ntop(const char *src, char *dst, size_t dstsiz)
|
||
|
{
|
||
|
const char *cp;
|
||
|
char *dn, *eom;
|
||
|
unsigned char c;
|
||
|
unsigned int n;
|
||
|
int l;
|
||
|
|
||
|
cp = src;
|
||
|
dn = dst;
|
||
|
eom = dst + dstsiz;
|
||
|
|
||
|
while ((n = *cp++) != 0) {
|
||
|
if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
|
||
|
/* Some kind of compression pointer. */
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
if (dn != dst) {
|
||
|
if (dn >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*dn++ = '.';
|
||
|
}
|
||
|
if ((l = labellen((const unsigned char*)(cp - 1))) < 0) {
|
||
|
errno = EMSGSIZE; /* XXX */
|
||
|
return(-1);
|
||
|
}
|
||
|
if (dn + l >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
if ((n & NS_CMPRSFLGS) == NS_TYPE_ELT) {
|
||
|
int m;
|
||
|
|
||
|
if (n != DNS_LABELTYPE_BITSTRING) {
|
||
|
/* XXX: labellen should reject this case */
|
||
|
errno = EINVAL;
|
||
|
return(-1);
|
||
|
}
|
||
|
if ((m = irc_decode_bitstring(&cp, dn, eom)) < 0)
|
||
|
{
|
||
|
errno = EMSGSIZE;
|
||
|
return(-1);
|
||
|
}
|
||
|
dn += m;
|
||
|
continue;
|
||
|
}
|
||
|
for ((void)NULL; l > 0; l--) {
|
||
|
c = *cp++;
|
||
|
if (special(c)) {
|
||
|
if (dn + 1 >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*dn++ = '\\';
|
||
|
*dn++ = (char)c;
|
||
|
} else if (!printable(c)) {
|
||
|
if (dn + 3 >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*dn++ = '\\';
|
||
|
*dn++ = digits[c / 100];
|
||
|
*dn++ = digits[(c % 100) / 10];
|
||
|
*dn++ = digits[c % 10];
|
||
|
} else {
|
||
|
if (dn >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*dn++ = (char)c;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
if (dn == dst) {
|
||
|
if (dn >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*dn++ = '.';
|
||
|
}
|
||
|
if (dn >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*dn++ = '\0';
|
||
|
return (dn - dst);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
|
||
|
* Return the size of the compressed name or -1.
|
||
|
* 'length' is the size of the array pointed to by 'comp_dn'.
|
||
|
*/
|
||
|
static int
|
||
|
irc_dn_comp(const char *src, unsigned char *dst, int dstsiz,
|
||
|
const unsigned char **dnptrs, const unsigned char **lastdnptr)
|
||
|
{
|
||
|
return(irc_ns_name_compress(src, dst, (size_t)dstsiz,
|
||
|
(const unsigned char **)dnptrs,
|
||
|
(const unsigned char **)lastdnptr));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Skip over a compressed domain name. Return the size or -1.
|
||
|
*/
|
||
|
int
|
||
|
irc_dn_skipname(const unsigned char *ptr, const unsigned char *eom) {
|
||
|
const unsigned char *saveptr = ptr;
|
||
|
|
||
|
if (irc_ns_name_skip(&ptr, eom) == -1)
|
||
|
return(-1);
|
||
|
return(ptr - saveptr);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* ns_name_skip(ptrptr, eom)
|
||
|
* Advance *ptrptr to skip over the compressed name it points at.
|
||
|
* return:
|
||
|
* 0 on success, -1 (with errno set) on failure.
|
||
|
*/
|
||
|
static int
|
||
|
irc_ns_name_skip(const unsigned char **ptrptr, const unsigned char *eom)
|
||
|
{
|
||
|
const unsigned char *cp;
|
||
|
unsigned int n;
|
||
|
int l;
|
||
|
|
||
|
cp = *ptrptr;
|
||
|
|
||
|
while (cp < eom && (n = *cp++) != 0)
|
||
|
{
|
||
|
/* Check for indirection. */
|
||
|
switch (n & NS_CMPRSFLGS)
|
||
|
{
|
||
|
case 0: /* normal case, n == len */
|
||
|
cp += n;
|
||
|
continue;
|
||
|
case NS_TYPE_ELT: /* EDNS0 extended label */
|
||
|
if ((l = labellen(cp - 1)) < 0)
|
||
|
{
|
||
|
errno = EMSGSIZE; /* XXX */
|
||
|
return(-1);
|
||
|
}
|
||
|
|
||
|
cp += l;
|
||
|
continue;
|
||
|
case NS_CMPRSFLGS: /* indirection */
|
||
|
cp++;
|
||
|
break;
|
||
|
default: /* illegal type */
|
||
|
errno = EMSGSIZE;
|
||
|
return(-1);
|
||
|
}
|
||
|
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (cp > eom)
|
||
|
{
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
*ptrptr = cp;
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
unsigned int
|
||
|
irc_ns_get16(const unsigned char *src)
|
||
|
{
|
||
|
unsigned int dst;
|
||
|
|
||
|
IRC_NS_GET16(dst, src);
|
||
|
return(dst);
|
||
|
}
|
||
|
|
||
|
unsigned long
|
||
|
irc_ns_get32(const unsigned char *src)
|
||
|
{
|
||
|
unsigned long dst;
|
||
|
|
||
|
IRC_NS_GET32(dst, src);
|
||
|
return(dst);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
irc_ns_put16(unsigned int src, unsigned char *dst)
|
||
|
{
|
||
|
IRC_NS_PUT16(src, dst);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
irc_ns_put32(unsigned long src, unsigned char *dst)
|
||
|
{
|
||
|
IRC_NS_PUT32(src, dst);
|
||
|
}
|
||
|
|
||
|
/* From ns_name.c */
|
||
|
|
||
|
/*
|
||
|
* special(ch)
|
||
|
* Thinking in noninternationalized USASCII (per the DNS spec),
|
||
|
* is this characted special ("in need of quoting") ?
|
||
|
* return:
|
||
|
* boolean.
|
||
|
*/
|
||
|
static int
|
||
|
special(int ch)
|
||
|
{
|
||
|
switch (ch)
|
||
|
{
|
||
|
case 0x22: /* '"' */
|
||
|
case 0x2E: /* '.' */
|
||
|
case 0x3B: /* ';' */
|
||
|
case 0x5C: /* '\\' */
|
||
|
case 0x28: /* '(' */
|
||
|
case 0x29: /* ')' */
|
||
|
/* Special modifiers in zone files. */
|
||
|
case 0x40: /* '@' */
|
||
|
case 0x24: /* '$' */
|
||
|
return(1);
|
||
|
default:
|
||
|
return(0);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
labellen(const unsigned char *lp)
|
||
|
{
|
||
|
int bitlen;
|
||
|
unsigned char l = *lp;
|
||
|
|
||
|
if ((l & NS_CMPRSFLGS) == NS_CMPRSFLGS)
|
||
|
{
|
||
|
/* should be avoided by the caller */
|
||
|
return(-1);
|
||
|
}
|
||
|
|
||
|
if ((l & NS_CMPRSFLGS) == NS_TYPE_ELT)
|
||
|
{
|
||
|
if (l == DNS_LABELTYPE_BITSTRING)
|
||
|
{
|
||
|
if ((bitlen = *(lp + 1)) == 0)
|
||
|
bitlen = 256;
|
||
|
return((bitlen + 7 ) / 8 + 1);
|
||
|
}
|
||
|
|
||
|
return(-1); /* unknwon ELT */
|
||
|
}
|
||
|
|
||
|
return(l);
|
||
|
}
|
||
|
|
||
|
|
||
|
/*
|
||
|
* printable(ch)
|
||
|
* Thinking in noninternationalized USASCII (per the DNS spec),
|
||
|
* is this character visible and not a space when printed ?
|
||
|
* return:
|
||
|
* boolean.
|
||
|
*/
|
||
|
static int
|
||
|
printable(int ch)
|
||
|
{
|
||
|
return(ch > 0x20 && ch < 0x7f);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
irc_decode_bitstring(const char **cpp, char *dn, const char *eom)
|
||
|
{
|
||
|
const char *cp = *cpp;
|
||
|
char *beg = dn, tc;
|
||
|
int b, blen, plen;
|
||
|
|
||
|
if ((blen = (*cp & 0xff)) == 0)
|
||
|
blen = 256;
|
||
|
plen = (blen + 3) / 4;
|
||
|
plen += sizeof("\\[x/]") + (blen > 99 ? 3 : (blen > 9) ? 2 : 1);
|
||
|
if (dn + plen >= eom)
|
||
|
return(-1);
|
||
|
|
||
|
cp++;
|
||
|
dn += sprintf(dn, "\\[x");
|
||
|
for (b = blen; b > 7; b -= 8, cp++)
|
||
|
dn += sprintf(dn, "%02x", *cp & 0xff);
|
||
|
if (b > 4) {
|
||
|
tc = *cp++;
|
||
|
dn += sprintf(dn, "%02x", tc & (0xff << (8 - b)));
|
||
|
} else if (b > 0) {
|
||
|
tc = *cp++;
|
||
|
dn += sprintf(dn, "%1x",
|
||
|
((tc >> 4) & 0x0f) & (0x0f << (4 - b)));
|
||
|
}
|
||
|
dn += sprintf(dn, "/%d]", blen);
|
||
|
|
||
|
*cpp = cp;
|
||
|
return(dn - beg);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* irc_ns_name_pton(src, dst, dstsiz)
|
||
|
* Convert a ascii string into an encoded domain name as per RFC1035.
|
||
|
* return:
|
||
|
* -1 if it fails
|
||
|
* 1 if string was fully qualified
|
||
|
* 0 is string was not fully qualified
|
||
|
* notes:
|
||
|
* Enforces label and domain length limits.
|
||
|
*/
|
||
|
static int
|
||
|
irc_ns_name_pton(const char *src, unsigned char *dst, size_t dstsiz)
|
||
|
{
|
||
|
unsigned char *label, *bp, *eom;
|
||
|
char *cp;
|
||
|
int c, n, escaped, e = 0;
|
||
|
|
||
|
escaped = 0;
|
||
|
bp = dst;
|
||
|
eom = dst + dstsiz;
|
||
|
label = bp++;
|
||
|
|
||
|
|
||
|
while ((c = *src++) != 0) {
|
||
|
if (escaped) {
|
||
|
if (c == '[') { /* start a bit string label */
|
||
|
if ((cp = strchr(src, ']')) == NULL) {
|
||
|
errno = EINVAL; /* ??? */
|
||
|
return(-1);
|
||
|
}
|
||
|
if ((e = irc_encode_bitsring(&src,
|
||
|
cp + 2,
|
||
|
&label,
|
||
|
&bp,
|
||
|
(const char *)eom))
|
||
|
!= 0) {
|
||
|
errno = e;
|
||
|
return(-1);
|
||
|
}
|
||
|
escaped = 0;
|
||
|
label = bp++;
|
||
|
if ((c = *src++) == 0)
|
||
|
goto done;
|
||
|
else if (c != '.') {
|
||
|
errno = EINVAL;
|
||
|
return(-1);
|
||
|
}
|
||
|
continue;
|
||
|
}
|
||
|
else if ((cp = strchr(digits, c)) != NULL) {
|
||
|
n = (cp - digits) * 100;
|
||
|
if ((c = *src++) == 0 ||
|
||
|
(cp = strchr(digits, c)) == NULL) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
n += (cp - digits) * 10;
|
||
|
if ((c = *src++) == 0 ||
|
||
|
(cp = strchr(digits, c)) == NULL) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
n += (cp - digits);
|
||
|
if (n > 255) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
c = n;
|
||
|
}
|
||
|
escaped = 0;
|
||
|
} else if (c == '\\') {
|
||
|
escaped = 1;
|
||
|
continue;
|
||
|
} else if (c == '.') {
|
||
|
c = (bp - label - 1);
|
||
|
if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
if (label >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*label = c;
|
||
|
/* Fully qualified ? */
|
||
|
if (*src == '\0') {
|
||
|
if (c != 0) {
|
||
|
if (bp >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*bp++ = '\0';
|
||
|
}
|
||
|
if ((bp - dst) > NS_MAXCDNAME) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
return (1);
|
||
|
}
|
||
|
if (c == 0 || *src == '.') {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
label = bp++;
|
||
|
continue;
|
||
|
}
|
||
|
if (bp >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*bp++ = (unsigned char)c;
|
||
|
}
|
||
|
c = (bp - label - 1);
|
||
|
if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
done:
|
||
|
if (label >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*label = c;
|
||
|
if (c != 0) {
|
||
|
if (bp >= eom) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
*bp++ = 0;
|
||
|
}
|
||
|
|
||
|
if ((bp - dst) > NS_MAXCDNAME)
|
||
|
{ /* src too big */
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* irc_ns_name_pack(src, dst, dstsiz, dnptrs, lastdnptr)
|
||
|
* Pack domain name 'domain' into 'comp_dn'.
|
||
|
* return:
|
||
|
* Size of the compressed name, or -1.
|
||
|
* notes:
|
||
|
* 'dnptrs' is an array of pointers to previous compressed names.
|
||
|
* dnptrs[0] is a pointer to the beginning of the message. The array
|
||
|
* ends with NULL.
|
||
|
* 'lastdnptr' is a pointer to the end of the array pointed to
|
||
|
* by 'dnptrs'.
|
||
|
* Side effects:
|
||
|
* The list of pointers in dnptrs is updated for labels inserted into
|
||
|
* the message as we compress the name. If 'dnptr' is NULL, we don't
|
||
|
* try to compress names. If 'lastdnptr' is NULL, we don't update the
|
||
|
* list.
|
||
|
*/
|
||
|
static int
|
||
|
irc_ns_name_pack(const unsigned char *src, unsigned char *dst, int dstsiz,
|
||
|
const unsigned char **dnptrs, const unsigned char **lastdnptr)
|
||
|
{
|
||
|
unsigned char *dstp;
|
||
|
const unsigned char **cpp, **lpp, *eob, *msg;
|
||
|
const unsigned char *srcp;
|
||
|
int n, l, first = 1;
|
||
|
|
||
|
srcp = src;
|
||
|
dstp = dst;
|
||
|
eob = dstp + dstsiz;
|
||
|
lpp = cpp = NULL;
|
||
|
if (dnptrs != NULL) {
|
||
|
if ((msg = *dnptrs++) != NULL) {
|
||
|
for (cpp = dnptrs; *cpp != NULL; cpp++)
|
||
|
(void)NULL;
|
||
|
lpp = cpp; /* end of list to search */
|
||
|
}
|
||
|
} else
|
||
|
msg = NULL;
|
||
|
|
||
|
/* make sure the domain we are about to add is legal */
|
||
|
l = 0;
|
||
|
do {
|
||
|
int l0;
|
||
|
|
||
|
n = *srcp;
|
||
|
if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
if ((l0 = labellen(srcp)) < 0) {
|
||
|
errno = EINVAL;
|
||
|
return(-1);
|
||
|
}
|
||
|
l += l0 + 1;
|
||
|
if (l > NS_MAXCDNAME) {
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
srcp += l0 + 1;
|
||
|
} while (n != 0);
|
||
|
|
||
|
/* from here on we need to reset compression pointer array on error */
|
||
|
srcp = src;
|
||
|
do {
|
||
|
/* Look to see if we can use pointers. */
|
||
|
n = *srcp;
|
||
|
if (n != 0 && msg != NULL) {
|
||
|
l = irc_dn_find(srcp, msg, (const unsigned char * const *)dnptrs,
|
||
|
(const unsigned char * const *)lpp);
|
||
|
if (l >= 0) {
|
||
|
if (dstp + 1 >= eob) {
|
||
|
goto cleanup;
|
||
|
}
|
||
|
*dstp++ = (l >> 8) | NS_CMPRSFLGS;
|
||
|
*dstp++ = l % 256;
|
||
|
return (dstp - dst);
|
||
|
}
|
||
|
/* Not found, save it. */
|
||
|
if (lastdnptr != NULL && cpp < lastdnptr - 1 &&
|
||
|
(dstp - msg) < 0x4000 && first) {
|
||
|
*cpp++ = dstp;
|
||
|
*cpp = NULL;
|
||
|
first = 0;
|
||
|
}
|
||
|
}
|
||
|
/* copy label to buffer */
|
||
|
if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
|
||
|
/* Should not happen. */
|
||
|
goto cleanup;
|
||
|
}
|
||
|
n = labellen(srcp);
|
||
|
if (dstp + 1 + n >= eob) {
|
||
|
goto cleanup;
|
||
|
}
|
||
|
memcpy(dstp, srcp, n + 1);
|
||
|
srcp += n + 1;
|
||
|
dstp += n + 1;
|
||
|
} while (n != 0);
|
||
|
|
||
|
if (dstp > eob) {
|
||
|
cleanup:
|
||
|
if (msg != NULL)
|
||
|
*lpp = NULL;
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
return(dstp - dst);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
irc_ns_name_compress(const char *src, unsigned char *dst, size_t dstsiz,
|
||
|
const unsigned char **dnptrs, const unsigned char **lastdnptr)
|
||
|
{
|
||
|
unsigned char tmp[NS_MAXCDNAME];
|
||
|
|
||
|
if (irc_ns_name_pton(src, tmp, sizeof tmp) == -1)
|
||
|
return(-1);
|
||
|
return(irc_ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
irc_encode_bitsring(const char **bp, const char *end, unsigned char **labelp,
|
||
|
unsigned char **dst, const char *eom)
|
||
|
{
|
||
|
int afterslash = 0;
|
||
|
const char *cp = *bp;
|
||
|
char *tp, c;
|
||
|
const char *beg_blen;
|
||
|
char *end_blen = NULL;
|
||
|
int value = 0, count = 0, tbcount = 0, blen = 0;
|
||
|
|
||
|
beg_blen = end_blen = NULL;
|
||
|
|
||
|
/* a bitstring must contain at least 2 characters */
|
||
|
if (end - cp < 2)
|
||
|
return(EINVAL);
|
||
|
|
||
|
/* XXX: currently, only hex strings are supported */
|
||
|
if (*cp++ != 'x')
|
||
|
return(EINVAL);
|
||
|
if (!isxdigit((*cp) & 0xff)) /* reject '\[x/BLEN]' */
|
||
|
return(EINVAL);
|
||
|
|
||
|
for (tp = (char*)(dst + 1); cp < end && tp < eom; cp++) {
|
||
|
switch((c = *cp)) {
|
||
|
case ']': /* end of the bitstring */
|
||
|
if (afterslash) {
|
||
|
if (beg_blen == NULL)
|
||
|
return(EINVAL);
|
||
|
blen = (int)strtol(beg_blen, &end_blen, 10);
|
||
|
if (*end_blen != ']')
|
||
|
return(EINVAL);
|
||
|
}
|
||
|
if (count)
|
||
|
*tp++ = ((value << 4) & 0xff);
|
||
|
cp++; /* skip ']' */
|
||
|
goto done;
|
||
|
case '/':
|
||
|
afterslash = 1;
|
||
|
break;
|
||
|
default:
|
||
|
if (afterslash) {
|
||
|
if (!isdigit(c&0xff))
|
||
|
return(EINVAL);
|
||
|
if (beg_blen == NULL) {
|
||
|
|
||
|
if (c == '0') {
|
||
|
/* blen never begings with 0 */
|
||
|
return(EINVAL);
|
||
|
}
|
||
|
beg_blen = cp;
|
||
|
}
|
||
|
} else {
|
||
|
if (!isxdigit(c&0xff))
|
||
|
return(EINVAL);
|
||
|
value <<= 4;
|
||
|
value += digitvalue[(int)c];
|
||
|
count += 4;
|
||
|
tbcount += 4;
|
||
|
if (tbcount > 256)
|
||
|
return(EINVAL);
|
||
|
if (count == 8) {
|
||
|
*tp++ = value;
|
||
|
count = 0;
|
||
|
}
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
done:
|
||
|
if (cp >= end || tp >= eom)
|
||
|
return(EMSGSIZE);
|
||
|
|
||
|
/*
|
||
|
* bit length validation:
|
||
|
* If a <length> is present, the number of digits in the <bit-data>
|
||
|
* MUST be just sufficient to contain the number of bits specified
|
||
|
* by the <length>. If there are insignificant bits in a final
|
||
|
* hexadecimal or octal digit, they MUST be zero.
|
||
|
* RFC 2673, Section 3.2.
|
||
|
*/
|
||
|
if (blen > 0) {
|
||
|
int traillen;
|
||
|
|
||
|
if (((blen + 3) & ~3) != tbcount)
|
||
|
return(EINVAL);
|
||
|
traillen = tbcount - blen; /* between 0 and 3 */
|
||
|
if (((value << (8 - traillen)) & 0xff) != 0)
|
||
|
return(EINVAL);
|
||
|
}
|
||
|
else
|
||
|
blen = tbcount;
|
||
|
if (blen == 256)
|
||
|
blen = 0;
|
||
|
|
||
|
/* encode the type and the significant bit fields */
|
||
|
**labelp = DNS_LABELTYPE_BITSTRING;
|
||
|
**dst = blen;
|
||
|
|
||
|
*bp = cp;
|
||
|
*dst = (unsigned char*)tp;
|
||
|
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* dn_find(domain, msg, dnptrs, lastdnptr)
|
||
|
* Search for the counted-label name in an array of compressed names.
|
||
|
* return:
|
||
|
* offset from msg if found, or -1.
|
||
|
* notes:
|
||
|
* dnptrs is the pointer to the first name on the list,
|
||
|
* not the pointer to the start of the message.
|
||
|
*/
|
||
|
static int
|
||
|
irc_dn_find(const unsigned char *domain, const unsigned char *msg,
|
||
|
const unsigned char * const *dnptrs,
|
||
|
const unsigned char * const *lastdnptr)
|
||
|
{
|
||
|
const unsigned char *dn, *cp, *sp;
|
||
|
const unsigned char * const *cpp;
|
||
|
unsigned int n;
|
||
|
|
||
|
for (cpp = dnptrs; cpp < lastdnptr; cpp++)
|
||
|
{
|
||
|
sp = *cpp;
|
||
|
/*
|
||
|
* terminate search on:
|
||
|
* root label
|
||
|
* compression pointer
|
||
|
* unusable offset
|
||
|
*/
|
||
|
while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 &&
|
||
|
(sp - msg) < 0x4000) {
|
||
|
dn = domain;
|
||
|
cp = sp;
|
||
|
while ((n = *cp++) != 0) {
|
||
|
/*
|
||
|
* check for indirection
|
||
|
*/
|
||
|
switch (n & NS_CMPRSFLGS) {
|
||
|
case 0: /* normal case, n == len */
|
||
|
n = labellen(cp - 1); /* XXX */
|
||
|
|
||
|
if (n != *dn++)
|
||
|
goto next;
|
||
|
|
||
|
for ((void)NULL; n > 0; n--)
|
||
|
if (mklower(*dn++) !=
|
||
|
mklower(*cp++))
|
||
|
goto next;
|
||
|
/* Is next root for both ? */
|
||
|
if (*dn == '\0' && *cp == '\0')
|
||
|
return (sp - msg);
|
||
|
if (*dn)
|
||
|
continue;
|
||
|
goto next;
|
||
|
case NS_CMPRSFLGS: /* indirection */
|
||
|
cp = msg + (((n & 0x3f) << 8) | *cp);
|
||
|
break;
|
||
|
|
||
|
default: /* illegal type */
|
||
|
errno = EMSGSIZE;
|
||
|
return (-1);
|
||
|
}
|
||
|
}
|
||
|
next: ;
|
||
|
sp += *sp + 1;
|
||
|
}
|
||
|
}
|
||
|
errno = ENOENT;
|
||
|
return (-1);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* * Thinking in noninternationalized USASCII (per the DNS spec),
|
||
|
* * convert this character to lower case if it's upper case.
|
||
|
* */
|
||
|
static int
|
||
|
mklower(int ch)
|
||
|
{
|
||
|
if (ch >= 0x41 && ch <= 0x5A)
|
||
|
return(ch + 0x20);
|
||
|
|
||
|
return(ch);
|
||
|
}
|
||
|
|
||
|
/* From resolv/mkquery.c */
|
||
|
|
||
|
/*
|
||
|
* Form all types of queries.
|
||
|
* Returns the size of the result or -1.
|
||
|
*/
|
||
|
int
|
||
|
irc_res_mkquery(
|
||
|
const char *dname, /* domain name */
|
||
|
int class, int type, /* class and type of query */
|
||
|
unsigned char *buf, /* buffer to put query */
|
||
|
int buflen) /* size of buffer */
|
||
|
{
|
||
|
HEADER *hp;
|
||
|
unsigned char *cp;
|
||
|
int n;
|
||
|
const unsigned char *dnptrs[20], **dpp, **lastdnptr;
|
||
|
|
||
|
/*
|
||
|
* Initialize header fields.
|
||
|
*/
|
||
|
if ((buf == NULL) || (buflen < HFIXEDSZ))
|
||
|
return (-1);
|
||
|
memset(buf, 0, HFIXEDSZ);
|
||
|
hp = (HEADER *)(void *)buf;
|
||
|
|
||
|
hp->id = 0;
|
||
|
hp->opcode = QUERY;
|
||
|
hp->rd = 1; /* recurse */
|
||
|
hp->rcode = NO_ERRORS;
|
||
|
cp = buf + HFIXEDSZ;
|
||
|
buflen -= HFIXEDSZ;
|
||
|
dpp = dnptrs;
|
||
|
*dpp++ = buf;
|
||
|
*dpp++ = NULL;
|
||
|
lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
|
||
|
|
||
|
if ((buflen -= QFIXEDSZ) < 0)
|
||
|
return (-1);
|
||
|
if ((n = irc_dn_comp(dname, cp, buflen, dnptrs, lastdnptr)) < 0)
|
||
|
return (-1);
|
||
|
|
||
|
cp += n;
|
||
|
buflen -= n;
|
||
|
IRC_NS_PUT16(type, cp);
|
||
|
IRC_NS_PUT16(class, cp);
|
||
|
hp->qdcount = htons(1);
|
||
|
|
||
|
return (cp - buf);
|
||
|
}
|