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a85b5759f3
These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
236 lines
6.5 KiB
C
236 lines
6.5 KiB
C
/*
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* services/modstack.c - stack of modules
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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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE 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 functions to help maintain a stack of modules.
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*/
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#include "config.h"
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#include <ctype.h>
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#include "services/modstack.h"
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#include "util/module.h"
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#include "util/fptr_wlist.h"
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#include "dns64/dns64.h"
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#include "iterator/iterator.h"
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#include "validator/validator.h"
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#include "respip/respip.h"
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#ifdef WITH_PYTHONMODULE
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#include "pythonmod/pythonmod.h"
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#endif
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#ifdef USE_CACHEDB
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#include "cachedb/cachedb.h"
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#endif
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#ifdef CLIENT_SUBNET
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#include "edns-subnet/subnetmod.h"
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#endif
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/** count number of modules (words) in the string */
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static int
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count_modules(const char* s)
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{
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int num = 0;
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if(!s)
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return 0;
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while(*s) {
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/* skip whitespace */
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while(*s && isspace((unsigned char)*s))
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s++;
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if(*s && !isspace((unsigned char)*s)) {
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/* skip identifier */
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num++;
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while(*s && !isspace((unsigned char)*s))
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s++;
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}
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}
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return num;
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}
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void
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modstack_init(struct module_stack* stack)
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{
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stack->num = 0;
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stack->mod = NULL;
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}
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int
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modstack_config(struct module_stack* stack, const char* module_conf)
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{
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int i;
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verbose(VERB_QUERY, "module config: \"%s\"", module_conf);
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stack->num = count_modules(module_conf);
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if(stack->num == 0) {
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log_err("error: no modules specified");
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return 0;
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}
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if(stack->num > MAX_MODULE) {
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log_err("error: too many modules (%d max %d)",
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stack->num, MAX_MODULE);
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return 0;
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}
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stack->mod = (struct module_func_block**)calloc((size_t)
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stack->num, sizeof(struct module_func_block*));
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if(!stack->mod) {
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log_err("out of memory");
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return 0;
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}
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for(i=0; i<stack->num; i++) {
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stack->mod[i] = module_factory(&module_conf);
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if(!stack->mod[i]) {
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log_err("Unknown value for next module: '%s'",
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module_conf);
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return 0;
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}
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}
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return 1;
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}
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/** The list of module names */
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const char**
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module_list_avail(void)
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{
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/* these are the modules available */
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static const char* names[] = {
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"dns64",
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#ifdef WITH_PYTHONMODULE
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"python",
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#endif
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#ifdef USE_CACHEDB
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"cachedb",
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#endif
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#ifdef CLIENT_SUBNET
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"subnetcache",
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#endif
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"respip",
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"validator",
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"iterator",
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NULL};
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return names;
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}
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/** func block get function type */
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typedef struct module_func_block* (*fbgetfunctype)(void);
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/** The list of module func blocks */
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static fbgetfunctype*
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module_funcs_avail(void)
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{
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static struct module_func_block* (*fb[])(void) = {
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&dns64_get_funcblock,
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#ifdef WITH_PYTHONMODULE
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&pythonmod_get_funcblock,
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#endif
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#ifdef USE_CACHEDB
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&cachedb_get_funcblock,
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#endif
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#ifdef CLIENT_SUBNET
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&subnetmod_get_funcblock,
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#endif
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&respip_get_funcblock,
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&val_get_funcblock,
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&iter_get_funcblock,
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NULL};
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return fb;
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}
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struct
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module_func_block* module_factory(const char** str)
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{
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int i = 0;
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const char* s = *str;
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const char** names = module_list_avail();
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fbgetfunctype* fb = module_funcs_avail();
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while(*s && isspace((unsigned char)*s))
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s++;
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while(names[i]) {
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if(strncmp(names[i], s, strlen(names[i])) == 0) {
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s += strlen(names[i]);
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*str = s;
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return (*fb[i])();
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}
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i++;
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}
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return NULL;
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}
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int
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modstack_setup(struct module_stack* stack, const char* module_conf,
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struct module_env* env)
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{
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int i;
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if(stack->num != 0)
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modstack_desetup(stack, env);
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/* fixed setup of the modules */
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if(!modstack_config(stack, module_conf)) {
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return 0;
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}
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env->need_to_validate = 0; /* set by module init below */
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for(i=0; i<stack->num; i++) {
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verbose(VERB_OPS, "init module %d: %s",
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i, stack->mod[i]->name);
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fptr_ok(fptr_whitelist_mod_init(stack->mod[i]->init));
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if(!(*stack->mod[i]->init)(env, i)) {
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log_err("module init for module %s failed",
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stack->mod[i]->name);
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return 0;
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}
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}
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return 1;
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}
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void
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modstack_desetup(struct module_stack* stack, struct module_env* env)
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{
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int i;
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for(i=0; i<stack->num; i++) {
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fptr_ok(fptr_whitelist_mod_deinit(stack->mod[i]->deinit));
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(*stack->mod[i]->deinit)(env, i);
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}
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stack->num = 0;
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free(stack->mod);
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stack->mod = NULL;
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}
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int
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modstack_find(struct module_stack* stack, const char* name)
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{
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int i;
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for(i=0; i<stack->num; i++) {
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if(strcmp(stack->mod[i]->name, name) == 0)
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return i;
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}
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return -1;
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}
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