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/* Copyright (C) 2015 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "knot/nameserver/query_module.h"
#include "libknot/libknot.h"
#include "contrib/openbsd/strlcpy.h"
/* Compiled-in module headers. */
#include "knot/modules/synth_record.h"
#include "knot/modules/dnsproxy.h"
#include "knot/modules/online_sign/module.h"
#ifdef HAVE_ROSEDB
#include "knot/modules/rosedb.h"
#endif
#if USE_DNSTAP
#include "knot/modules/dnstap.h"
#endif
typedef struct static_module {
const yp_name_t *name;
qmodule_load_t load;
qmodule_unload_t unload;
unsigned scope;
} static_module_t;
/*! \note All modules should be dynamically loaded later on. */
static_module_t MODULES[] = {
{ C_MOD_SYNTH_RECORD, &synth_record_load, &synth_record_unload, MOD_SCOPE_ANY },
{ C_MOD_DNSPROXY, &dnsproxy_load, &dnsproxy_unload, MOD_SCOPE_ANY },
{ C_MOD_ONLINE_SIGN, &online_sign_load, &online_sign_unload, MOD_SCOPE_ZONE },
#ifdef HAVE_ROSEDB
{ C_MOD_ROSEDB, &rosedb_load, &rosedb_unload, MOD_SCOPE_ANY },
#endif
#if USE_DNSTAP
{ C_MOD_DNSTAP, &dnstap_load, &dnstap_unload, MOD_SCOPE_ANY },
#endif
{ NULL }
};
struct query_plan *query_plan_create(mm_ctx_t *mm)
{
struct query_plan *plan = mm_alloc(mm, sizeof(struct query_plan));
if (plan == NULL) {
return NULL;
}
plan->mm = mm;
for (unsigned i = 0; i < QUERY_PLAN_STAGES; ++i) {
init_list(&plan->stage[i]);
}
return plan;
}
void query_plan_free(struct query_plan *plan)
{
if (plan == NULL) {
return;
}
for (unsigned i = 0; i < QUERY_PLAN_STAGES; ++i) {
struct query_step *step = NULL, *next = NULL;
WALK_LIST_DELSAFE(step, next, plan->stage[i]) {
mm_free(plan->mm, step);
}
}
mm_free(plan->mm, plan);
}
static struct query_step *make_step(mm_ctx_t *mm, qmodule_process_t process,
void *ctx)
{
struct query_step *step = mm_alloc(mm, sizeof(struct query_step));
if (step == NULL) {
return NULL;
}
memset(step, 0, sizeof(struct query_step));
step->process = process;
step->ctx = ctx;
return step;
}
int query_plan_step(struct query_plan *plan, int stage, qmodule_process_t process,
void *ctx)
{
struct query_step *step = make_step(plan->mm, process, ctx);
if (step == NULL) {
return KNOT_ENOMEM;
}
add_tail(&plan->stage[stage], &step->node);
return KNOT_EOK;
}
static static_module_t *find_module(const yp_name_t *name)
{
/* Search for the module by name. */
static_module_t *module = NULL;
for (unsigned i = 0; MODULES[i].name != NULL; ++i) {
if (name[0] == MODULES[i].name[0] &&
memcmp(name + 1, MODULES[i].name + 1, name[0]) == 0) {
module = &MODULES[i];
break;
}
}
return module;
}
struct query_module *query_module_open(conf_t *config, conf_mod_id_t *mod_id,
mm_ctx_t *mm)
{
if (config == NULL || mod_id == NULL) {
return NULL;
}
/* Locate the module. */
static_module_t *found = find_module(mod_id->name);
if (found == NULL) {
return NULL;
}
/* Create query module. */
struct query_module *module = mm_alloc(mm, sizeof(struct query_module));
if (module == NULL) {
return NULL;
}
memset(module, 0, sizeof(struct query_module));
module->mm = mm;
module->config = config;
module->id = mod_id;
module->load = found->load;
module->unload = found->unload;
module->scope = found->scope;
return module;
}
void query_module_close(struct query_module *module)
{
if (module == NULL) {
return;
}
conf_free_mod_id(module->id);
mm_free(module->mm, module);
}
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