2016-05-02 21:25:20 +08:00
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/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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2000-07-21 12:12:25 +08:00
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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1997-09-16 08:42:43 +08:00
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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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2000-07-21 12:12:25 +08:00
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/*
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* This file is primarily maintained by <tytso@mit.edu> and <ghudson@mit.edu>.
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1997-09-16 08:42:43 +08:00
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*/
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2000-07-21 12:12:25 +08:00
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/*
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* hesiod.c --- the core portion of the hesiod resolver.
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1997-09-16 08:42:43 +08:00
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*
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2000-07-21 12:12:25 +08:00
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* This file is derived from the hesiod library from Project Athena;
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* It has been extensively rewritten by Theodore Ts'o to have a more
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* thread-safe interface.
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1997-09-16 08:42:43 +08:00
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*/
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2000-07-21 12:12:25 +08:00
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/* Imports */
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1997-09-16 08:42:43 +08:00
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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2000-07-21 12:12:25 +08:00
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1997-09-16 08:42:43 +08:00
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2000-07-21 12:12:25 +08:00
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1997-09-16 08:42:43 +08:00
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#include "hesiod.h"
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#include "hesiod_p.h"
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2000-07-21 12:12:25 +08:00
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#define _PATH_HESIOD_CONF "/etc/hesiod.conf"
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1997-09-16 08:42:43 +08:00
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2000-07-21 12:12:25 +08:00
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/* Forward */
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static int parse_config_file(struct hesiod_p *ctx, const char *filename);
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static char ** get_txt_records(struct hesiod_p *ctx, int class,
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const char *name);
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/* Public */
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/*
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* This function is called to initialize a hesiod_p.
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*/
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1998-02-21 02:45:36 +08:00
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int
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2000-07-21 12:12:25 +08:00
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hesiod_init(void **context) {
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struct hesiod_p *ctx;
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const char *configname;
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char *cp;
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ctx = malloc(sizeof(struct hesiod_p));
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2001-02-03 16:30:32 +08:00
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if (ctx == 0)
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2000-07-21 12:12:25 +08:00
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return (-1);
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ctx->LHS = NULL;
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ctx->RHS = NULL;
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2005-06-15 12:14:52 +08:00
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/* Set default query classes. */
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ctx->classes[0] = C_IN;
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ctx->classes[1] = C_HS;
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2000-07-21 12:12:25 +08:00
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2012-07-26 01:46:22 +08:00
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configname = __libc_secure_getenv("HESIOD_CONFIG");
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2000-07-21 12:12:25 +08:00
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if (!configname)
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configname = _PATH_HESIOD_CONF;
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if (parse_config_file(ctx, configname) < 0) {
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goto cleanup;
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1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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/*
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* The default RHS can be overridden by an environment
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* variable.
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*/
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2012-07-26 01:46:22 +08:00
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if ((cp = __libc_secure_getenv("HES_DOMAIN")) != NULL) {
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2001-02-03 16:30:32 +08:00
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free(ctx->RHS);
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2000-07-21 12:12:25 +08:00
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ctx->RHS = malloc(strlen(cp)+2);
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2001-02-03 16:30:32 +08:00
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if (!ctx->RHS)
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2000-07-21 12:12:25 +08:00
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goto cleanup;
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if (cp[0] == '.')
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strcpy(ctx->RHS, cp);
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else {
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2001-02-03 16:30:32 +08:00
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ctx->RHS[0] = '.';
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strcpy(ctx->RHS + 1, cp);
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2000-07-21 12:12:25 +08:00
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}
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}
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/*
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* If there is no default hesiod realm set, we return an
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* error.
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*/
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2005-06-15 14:44:01 +08:00
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if (!ctx->RHS) {
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2000-07-21 12:12:25 +08:00
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__set_errno(ENOEXEC);
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goto cleanup;
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}
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2001-02-03 15:01:11 +08:00
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2000-07-21 12:12:25 +08:00
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*context = ctx;
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return (0);
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cleanup:
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hesiod_end(ctx);
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return (-1);
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1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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/*
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* This function deallocates the hesiod_p
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*/
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1998-02-21 02:45:36 +08:00
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void
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2000-07-21 12:12:25 +08:00
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hesiod_end(void *context) {
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struct hesiod_p *ctx = (struct hesiod_p *) context;
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int save_errno = errno;
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2001-02-03 16:30:32 +08:00
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free(ctx->RHS);
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free(ctx->LHS);
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2000-07-21 12:12:25 +08:00
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free(ctx);
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__set_errno(save_errno);
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1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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/*
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* This function takes a hesiod (name, type) and returns a DNS
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1997-09-16 08:42:43 +08:00
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* name which is to be resolved.
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*/
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1998-02-21 02:45:36 +08:00
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char *
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2000-07-21 12:12:25 +08:00
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hesiod_to_bind(void *context, const char *name, const char *type) {
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struct hesiod_p *ctx = (struct hesiod_p *) context;
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char *bindname;
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char **rhs_list = NULL;
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const char *RHS, *cp;
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2001-02-03 16:30:32 +08:00
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char *endp;
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2000-07-21 12:12:25 +08:00
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/* Decide what our RHS is, and set cp to the end of the actual name. */
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if ((cp = strchr(name, '@')) != NULL) {
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if (strchr(cp + 1, '.'))
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RHS = cp + 1;
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else if ((rhs_list = hesiod_resolve(context, cp + 1,
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"rhs-extension")) != NULL)
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RHS = *rhs_list;
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else {
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__set_errno(ENOENT);
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return (NULL);
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}
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} else {
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RHS = ctx->RHS;
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cp = name + strlen(name);
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}
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/*
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* Allocate the space we need, including up to three periods and
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* the terminating NUL.
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*/
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if ((bindname = malloc((cp - name) + strlen(type) + strlen(RHS) +
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(ctx->LHS ? strlen(ctx->LHS) : 0) + 4)) == NULL) {
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if (rhs_list)
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hesiod_free_list(context, rhs_list);
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return NULL;
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}
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/* Now put together the DNS name. */
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2001-02-03 16:30:32 +08:00
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endp = (char *) __mempcpy (bindname, name, cp - name);
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*endp++ = '.';
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endp = (char *) __stpcpy (endp, type);
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2000-07-21 12:12:25 +08:00
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if (ctx->LHS) {
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if (ctx->LHS[0] != '.')
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2001-02-03 16:30:32 +08:00
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*endp++ = '.';
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endp = __stpcpy (endp, ctx->LHS);
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1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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if (RHS[0] != '.')
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2001-02-03 16:30:32 +08:00
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*endp++ = '.';
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strcpy (endp, RHS);
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2000-07-21 12:12:25 +08:00
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if (rhs_list)
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hesiod_free_list(context, rhs_list);
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return (bindname);
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1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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/*
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* This is the core function. Given a hesiod (name, type), it
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1997-09-16 08:42:43 +08:00
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* returns an array of strings returned by the resolver.
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*/
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1998-02-21 02:45:36 +08:00
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char **
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2000-07-21 12:12:25 +08:00
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hesiod_resolve(void *context, const char *name, const char *type) {
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struct hesiod_p *ctx = (struct hesiod_p *) context;
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char *bindname = hesiod_to_bind(context, name, type);
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char **retvec;
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if (bindname == NULL)
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return (NULL);
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1997-09-16 08:42:43 +08:00
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2005-06-15 12:14:52 +08:00
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retvec = get_txt_records(ctx, ctx->classes[0], bindname);
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if (retvec == NULL && (errno == ENOENT || errno == ECONNREFUSED) && ctx->classes[1])
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retvec = get_txt_records(ctx, ctx->classes[1], bindname);
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2001-02-03 15:01:11 +08:00
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1997-09-16 08:42:43 +08:00
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2000-07-21 12:12:25 +08:00
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free(bindname);
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return (retvec);
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1997-09-16 08:42:43 +08:00
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}
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1998-02-21 02:45:36 +08:00
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void
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2000-07-21 12:12:25 +08:00
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hesiod_free_list(void *context, char **list) {
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char **p;
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1997-09-16 08:42:43 +08:00
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2000-07-21 12:12:25 +08:00
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for (p = list; *p; p++)
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free(*p);
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free(list);
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1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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/*
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* This function parses the /etc/hesiod.conf file
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*/
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1998-02-21 02:45:36 +08:00
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static int
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2000-07-21 12:12:25 +08:00
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parse_config_file(struct hesiod_p *ctx, const char *filename) {
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char buf[MAXDNAME+7];
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FILE *fp;
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/*
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* Clear the existing configuration variable, just in case
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* they're set.
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*/
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2001-02-03 16:30:32 +08:00
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free(ctx->RHS);
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free(ctx->LHS);
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2000-07-21 12:12:25 +08:00
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ctx->RHS = ctx->LHS = 0;
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2005-06-15 12:14:52 +08:00
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/* Set default query classes. */
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ctx->classes[0] = C_IN;
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ctx->classes[1] = C_HS;
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2000-07-21 12:12:25 +08:00
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/*
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* Now open and parse the file...
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*/
|
2011-11-15 17:24:42 +08:00
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if (!(fp = fopen(filename, "rce")))
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2000-07-21 12:12:25 +08:00
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return (-1);
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2001-02-03 15:01:11 +08:00
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2000-07-21 12:12:25 +08:00
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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2005-06-15 12:14:52 +08:00
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char *key, *data, *cp, **cpp;
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2000-07-21 12:12:25 +08:00
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cp = buf;
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if (*cp == '#' || *cp == '\n' || *cp == '\r')
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continue;
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while(*cp == ' ' || *cp == '\t')
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cp++;
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key = cp;
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while(*cp != ' ' && *cp != '\t' && *cp != '=')
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cp++;
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*cp++ = '\0';
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2001-02-03 15:01:11 +08:00
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2000-07-21 12:12:25 +08:00
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while(*cp == ' ' || *cp == '\t' || *cp == '=')
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cp++;
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data = cp;
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while(*cp != ' ' && *cp != '\n' && *cp != '\r')
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cp++;
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*cp++ = '\0';
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2005-06-15 12:14:52 +08:00
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cpp = NULL;
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if (strcasecmp(key, "lhs") == 0)
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2000-07-21 12:12:25 +08:00
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cpp = &ctx->LHS;
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2005-06-15 12:14:52 +08:00
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else if (strcasecmp(key, "rhs") == 0)
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2000-07-21 12:12:25 +08:00
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cpp = &ctx->RHS;
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2005-06-15 12:14:52 +08:00
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if (cpp) {
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*cpp = strdup(data);
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if (!*cpp)
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goto cleanup;
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} else if (strcasecmp(key, "classes") == 0) {
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int n = 0;
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while (*data && n < 2) {
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cp = strchrnul(data, ',');
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if (*cp != '\0')
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*cp++ = '\0';
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if (strcasecmp(data, "IN") == 0)
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ctx->classes[n++] = C_IN;
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else if (strcasecmp(data, "HS") == 0)
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ctx->classes[n++] = C_HS;
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data = cp;
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}
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if (n == 0) {
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/* Restore the default. Better than
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nother at all. */
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ctx->classes[0] = C_IN;
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ctx->classes[1] = C_HS;
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2005-06-15 14:44:01 +08:00
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} else if (n == 1
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|| ctx->classes[0] == ctx->classes[1])
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2005-06-15 12:14:52 +08:00
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ctx->classes[1] = 0;
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}
|
1997-09-16 08:42:43 +08:00
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}
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2000-07-21 12:12:25 +08:00
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|
|
fclose(fp);
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return (0);
|
2001-02-03 15:01:11 +08:00
|
|
|
|
2000-07-21 12:12:25 +08:00
|
|
|
cleanup:
|
|
|
|
fclose(fp);
|
2001-02-03 16:30:32 +08:00
|
|
|
free(ctx->RHS);
|
|
|
|
free(ctx->LHS);
|
2000-07-21 12:12:25 +08:00
|
|
|
ctx->RHS = ctx->LHS = 0;
|
|
|
|
return (-1);
|
1997-09-17 05:51:15 +08:00
|
|
|
}
|
1997-09-16 08:42:43 +08:00
|
|
|
|
2000-07-21 12:12:25 +08:00
|
|
|
/*
|
|
|
|
* Given a DNS class and a DNS name, do a lookup for TXT records, and
|
1997-09-16 08:42:43 +08:00
|
|
|
* return a list of them.
|
|
|
|
*/
|
1998-02-21 02:45:36 +08:00
|
|
|
static char **
|
2000-07-21 12:12:25 +08:00
|
|
|
get_txt_records(struct hesiod_p *ctx, int class, const char *name) {
|
|
|
|
struct {
|
|
|
|
int type; /* RR type */
|
|
|
|
int class; /* RR class */
|
|
|
|
int dlen; /* len of data section */
|
|
|
|
u_char *data; /* pointer to data */
|
|
|
|
} rr;
|
|
|
|
HEADER *hp;
|
|
|
|
u_char qbuf[MAX_HESRESP], abuf[MAX_HESRESP];
|
|
|
|
u_char *cp, *erdata, *eom;
|
|
|
|
char *dst, *edst, **list;
|
|
|
|
int ancount, qdcount;
|
|
|
|
int i, j, n, skip;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Construct the query and send it.
|
|
|
|
*/
|
2016-05-02 21:25:20 +08:00
|
|
|
n = res_mkquery(QUERY, name, class, T_TXT, NULL, 0,
|
2000-07-21 12:12:25 +08:00
|
|
|
NULL, qbuf, MAX_HESRESP);
|
|
|
|
if (n < 0) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
return (NULL);
|
1997-09-16 08:42:43 +08:00
|
|
|
}
|
2016-05-02 21:25:20 +08:00
|
|
|
n = res_send(qbuf, n, abuf, MAX_HESRESP);
|
2000-07-21 12:12:25 +08:00
|
|
|
if (n < 0) {
|
|
|
|
__set_errno(ECONNREFUSED);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
if (n < HFIXEDSZ) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
return (NULL);
|
1997-09-16 08:42:43 +08:00
|
|
|
}
|
|
|
|
|
2000-07-21 12:12:25 +08:00
|
|
|
/*
|
|
|
|
* OK, parse the result.
|
|
|
|
*/
|
|
|
|
hp = (HEADER *) abuf;
|
|
|
|
ancount = ntohs(hp->ancount);
|
|
|
|
qdcount = ntohs(hp->qdcount);
|
|
|
|
cp = abuf + sizeof(HEADER);
|
|
|
|
eom = abuf + n;
|
|
|
|
|
|
|
|
/* Skip query, trying to get to the answer section which follows. */
|
|
|
|
for (i = 0; i < qdcount; i++) {
|
|
|
|
skip = dn_skipname(cp, eom);
|
|
|
|
if (skip < 0 || cp + skip + QFIXEDSZ > eom) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
cp += skip + QFIXEDSZ;
|
1997-09-16 08:42:43 +08:00
|
|
|
}
|
|
|
|
|
2000-07-21 12:12:25 +08:00
|
|
|
list = malloc((ancount + 1) * sizeof(char *));
|
2001-02-03 16:30:32 +08:00
|
|
|
if (!list)
|
2000-07-21 12:12:25 +08:00
|
|
|
return (NULL);
|
|
|
|
j = 0;
|
|
|
|
for (i = 0; i < ancount; i++) {
|
|
|
|
skip = dn_skipname(cp, eom);
|
|
|
|
if (skip < 0) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
cp += skip;
|
|
|
|
if (cp + 3 * INT16SZ + INT32SZ > eom) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
rr.type = ns_get16(cp);
|
|
|
|
cp += INT16SZ;
|
|
|
|
rr.class = ns_get16(cp);
|
|
|
|
cp += INT16SZ + INT32SZ; /* skip the ttl, too */
|
|
|
|
rr.dlen = ns_get16(cp);
|
|
|
|
cp += INT16SZ;
|
2016-05-02 22:04:32 +08:00
|
|
|
if (rr.dlen == 0 || cp + rr.dlen > eom) {
|
2000-07-21 12:12:25 +08:00
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
rr.data = cp;
|
|
|
|
cp += rr.dlen;
|
|
|
|
if (rr.class != class || rr.type != T_TXT)
|
|
|
|
continue;
|
|
|
|
if (!(list[j] = malloc(rr.dlen)))
|
|
|
|
goto cleanup;
|
|
|
|
dst = list[j++];
|
|
|
|
edst = dst + rr.dlen;
|
|
|
|
erdata = rr.data + rr.dlen;
|
|
|
|
cp = rr.data;
|
|
|
|
while (cp < erdata) {
|
|
|
|
n = (unsigned char) *cp++;
|
|
|
|
if (cp + n > eom || dst + n > edst) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
memcpy(dst, cp, n);
|
|
|
|
cp += n;
|
|
|
|
dst += n;
|
|
|
|
}
|
|
|
|
if (cp != erdata) {
|
|
|
|
__set_errno(EMSGSIZE);
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
*dst = '\0';
|
1997-09-16 08:42:43 +08:00
|
|
|
}
|
2000-07-21 12:12:25 +08:00
|
|
|
list[j] = NULL;
|
|
|
|
if (j == 0) {
|
|
|
|
__set_errno(ENOENT);
|
|
|
|
goto cleanup;
|
1997-09-16 08:42:43 +08:00
|
|
|
}
|
2000-07-21 12:12:25 +08:00
|
|
|
return (list);
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
for (i = 0; i < j; i++)
|
|
|
|
free(list[i]);
|
|
|
|
free(list);
|
|
|
|
return (NULL);
|
|
|
|
}
|