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124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/*
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* validator/validator.c - secure validator DNS query response module
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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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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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains a module that performs validation of DNS queries.
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* According to RFC 4034.
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*/
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#include "config.h"
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#include "validator/validator.h"
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#include "util/module.h"
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#include "util/log.h"
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/** validator init */
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static int
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val_init(struct module_env* env, int id)
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{
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struct val_env* val_env = (struct val_env*)calloc(1,
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sizeof(struct val_env));
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if(!val_env) {
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log_err("malloc failure");
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return 0;
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}
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env->modinfo[id] = (void*)val_env;
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/*if(!val_apply_cfg(val_env, env->cfg)) {
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log_err("validator: could not apply configuration settings.");
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return 0;
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}*/
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return 1;
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}
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/** validator deinit */
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static void
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val_deinit(struct module_env* env, int id)
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{
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struct val_env* val_env;
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if(!env || !env->modinfo || !env->modinfo[id])
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return;
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val_env = (struct val_env*)env->modinfo[id];
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free(val_env);
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}
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/** validator operate on a query */
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static void
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val_operate(struct module_qstate* qstate, enum module_ev event, int id,
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struct outbound_entry* outbound)
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{
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struct val_env* ve = (struct val_env*)qstate->env->modinfo[id];
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struct val_qstate* vq = (struct val_qstate*)qstate->minfo[id];
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verbose(VERB_DETAIL, "validator[module %d] operate: extstate:%s "
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"event:%s", id, strextstate(qstate->ext_state[id]),
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strmodulevent(event));
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if(vq) log_query_info(VERB_DETAIL, "iterator operate: query",
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&qstate->qinfo);
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(void)ve;
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(void)outbound;
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}
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/** validator cleanup query state */
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static void
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val_clear(struct module_qstate* qstate, int id)
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{
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if(!qstate)
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return;
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/* everything is allocated in the region, so assign NULL */
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qstate->minfo[id] = NULL;
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}
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/**
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* The validator function block
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*/
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static struct module_func_block val_block = {
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"validator",
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&val_init, &val_deinit, &val_operate, &val_clear
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};
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struct module_func_block*
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val_get_funcblock()
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{
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return &val_block;
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}
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const char*
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val_state_to_string(enum val_state state)
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{
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switch(state) {
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case VAL_STATE_INIT: return "VAL_STATE_INIT";
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}
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return "UNKNOWN VALIDATOR STATE";
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}
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