/*
* services/modstack.c - stack of modules
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions to help maintain a stack of modules.
*/
#include "config.h"
#include <ctype.h>
#include "services/modstack.h"
#include "util/module.h"
#include "util/fptr_wlist.h"
#include "dns64/dns64.h"
#include "iterator/iterator.h"
#include "validator/validator.h"
#include "respip/respip.h"
#ifdef WITH_PYTHONMODULE
#include "pythonmod/pythonmod.h"
#endif
#ifdef USE_CACHEDB
#include "cachedb/cachedb.h"
#endif
#ifdef CLIENT_SUBNET
#include "edns-subnet/subnetmod.h"
#endif
/** count number of modules (words) in the string */
static int
count_modules(const char* s)
{
int num = 0;
if(!s)
return 0;
while(*s) {
/* skip whitespace */
while(*s && isspace((unsigned char)*s))
s++;
if(*s && !isspace((unsigned char)*s)) {
/* skip identifier */
num++;
while(*s && !isspace((unsigned char)*s))
s++;
}
}
return num;
}
void
modstack_init(struct module_stack* stack)
{
stack->num = 0;
stack->mod = NULL;
}
int
modstack_config(struct module_stack* stack, const char* module_conf)
{
int i;
verbose(VERB_QUERY, "module config: \"%s\"", module_conf);
stack->num = count_modules(module_conf);
if(stack->num == 0) {
log_err("error: no modules specified");
return 0;
}
if(stack->num > MAX_MODULE) {
log_err("error: too many modules (%d max %d)",
stack->num, MAX_MODULE);
return 0;
}
stack->mod = (struct module_func_block**)calloc((size_t)
stack->num, sizeof(struct module_func_block*));
if(!stack->mod) {
log_err("out of memory");
return 0;
}
for(i=0; i<stack->num; i++) {
stack->mod[i] = module_factory(&module_conf);
if(!stack->mod[i]) {
log_err("Unknown value for next module: '%s'",
module_conf);
return 0;
}
}
return 1;
}
/** The list of module names */
const char**
module_list_avail(void)
{
/* these are the modules available */
static const char* names[] = {
"dns64",
#ifdef WITH_PYTHONMODULE
"python",
#endif
#ifdef USE_CACHEDB
"cachedb",
#endif
#ifdef CLIENT_SUBNET
"subnetcache",
#endif
"respip",
"validator",
"iterator",
NULL};
return names;
}
/** func block get function type */
typedef struct module_func_block* (*fbgetfunctype)(void);
/** The list of module func blocks */
static fbgetfunctype*
module_funcs_avail(void)
{
static struct module_func_block* (*fb[])(void) = {
&dns64_get_funcblock,
#ifdef WITH_PYTHONMODULE
&pythonmod_get_funcblock,
#endif
#ifdef USE_CACHEDB
&cachedb_get_funcblock,
#endif
#ifdef CLIENT_SUBNET
&subnetmod_get_funcblock,
#endif
&respip_get_funcblock,
&val_get_funcblock,
&iter_get_funcblock,
NULL};
return fb;
}
struct
module_func_block* module_factory(const char** str)
{
int i = 0;
const char* s = *str;
const char** names = module_list_avail();
fbgetfunctype* fb = module_funcs_avail();
while(*s && isspace((unsigned char)*s))
s++;
while(names[i]) {
if(strncmp(names[i], s, strlen(names[i])) == 0) {
s += strlen(names[i]);
*str = s;
return (*fb[i])();
}
i++;
}
return NULL;
}
int
modstack_setup(struct module_stack* stack, const char* module_conf,
struct module_env* env)
{
int i;
if(stack->num != 0)
modstack_desetup(stack, env);
/* fixed setup of the modules */
if(!modstack_config(stack, module_conf)) {
return 0;
}
env->need_to_validate = 0; /* set by module init below */
for(i=0; i<stack->num; i++) {
verbose(VERB_OPS, "init module %d: %s",
i, stack->mod[i]->name);
fptr_ok(fptr_whitelist_mod_init(stack->mod[i]->init));
if(!(*stack->mod[i]->init)(env, i)) {
log_err("module init for module %s failed",
stack->mod[i]->name);
return 0;
}
}
return 1;
}
void
modstack_desetup(struct module_stack* stack, struct module_env* env)
{
int i;
for(i=0; i<stack->num; i++) {
fptr_ok(fptr_whitelist_mod_deinit(stack->mod[i]->deinit));
(*stack->mod[i]->deinit)(env, i);
}
stack->num = 0;
free(stack->mod);
stack->mod = NULL;
}
int
modstack_find(struct module_stack* stack, const char* name)
{
int i;
for(i=0; i<stack->num; i++) {
if(strcmp(stack->mod[i]->name, name) == 0)
return i;
}
return -1;
}
