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unbound/services/modstack.c
W.C.A. Wijngaards ff653a7ef8 Call module init init again, and new function startup and destartup. 
NULL can be used if the function is not used. Open shared ports during
reload. Deinit is called during reload.
2024-07-01 16:10:07 +02:00

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/*
* 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 WITH_DYNLIBMODULE
#include "dynlibmod/dynlibmod.h"
#endif
#ifdef USE_CACHEDB
#include "cachedb/cachedb.h"
#endif
#ifdef USE_IPSECMOD
#include "ipsecmod/ipsecmod.h"
#endif
#ifdef CLIENT_SUBNET
#include "edns-subnet/subnetmod.h"
#endif
#ifdef USE_IPSET
#include "ipset/ipset.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;
}
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]) {
char md[256];
char * s = md;
snprintf(md, sizeof(md), "%s", module_conf);
/* Leading spaces are present on errors. */
while (*s && isspace((unsigned char)*s))
s++;
if(strchr(s, ' ')) *(strchr(s, ' ')) = 0;
if(strchr(s, '\t')) *(strchr(s, '\t')) = 0;
log_err("Unknown value in module-config, module: '%s'."
" This module is not present (not compiled in),"
" See the list of linked modules with unbound -V", s);
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 WITH_DYNLIBMODULE
"dynlib",
#endif
#ifdef USE_CACHEDB
"cachedb",
#endif
#ifdef USE_IPSECMOD
"ipsecmod",
#endif
#ifdef CLIENT_SUBNET
"subnetcache",
#endif
#ifdef USE_IPSET
"ipset",
#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 WITH_DYNLIBMODULE
&dynlibmod_get_funcblock,
#endif
#ifdef USE_CACHEDB
&cachedb_get_funcblock,
#endif
#ifdef USE_IPSECMOD
&ipsecmod_get_funcblock,
#endif
#ifdef CLIENT_SUBNET
&subnetmod_get_funcblock,
#endif
#ifdef USE_IPSET
&ipset_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_startup(struct module_stack* stack, const char* module_conf,
struct module_env* env)
{
int i;
if (stack->num != 0)
fatal_exit("unexpected already initialised modules");
/* fixed setup of the modules */
if(!modstack_config(stack, module_conf)) {
return 0;
}
for(i=0; i<stack->num; i++) {
if(stack->mod[i]->startup == NULL)
continue;
verbose(VERB_OPS, "startup module %d: %s",
i, stack->mod[i]->name);
fptr_ok(fptr_whitelist_mod_startup(stack->mod[i]->startup));
if(!(*stack->mod[i]->startup)(env, i)) {
log_err("module startup for module %s failed",
stack->mod[i]->name);
return 0;
}
}
return 1;
}
int
modstack_call_init(struct module_stack* stack, const char* module_conf,
struct module_env* env)
{
int i;
env->need_to_validate = 0; /* set by module setup below */
for(i=0; i<stack->num; i++) {
while(*module_conf && isspace(*module_conf))
module_conf++;
if(strncmp(stack->mod[i]->name, module_conf,
strlen(stack->mod[i]->name))) {
log_err("changed module ordering during reload not supported");
return 0;
}
module_conf += strlen(stack->mod[i]->name);
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_deinit(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);
}
}
void
modstack_destartup(struct module_stack* stack, struct module_env* env)
{
int i;
for(i=0; i<stack->num; i++) {
if(stack->mod[i]->destartup == NULL)
continue;
fptr_ok(fptr_whitelist_mod_destartup(stack->mod[i]->destartup));
(*stack->mod[i]->destartup)(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;
}
size_t
mod_get_mem(struct module_env* env, const char* name)
{
int m = modstack_find(&env->mesh->mods, name);
if(m != -1) {
fptr_ok(fptr_whitelist_mod_get_mem(env->mesh->
mods.mod[m]->get_mem));
return (*env->mesh->mods.mod[m]->get_mem)(env, m);
}
return 0;
}
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