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/* Copyright (C) 2021 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 <https://www.gnu.org/licenses/>.
*/
#include "knot/include/module.h"
#include "contrib/sockaddr.h"
#define MOD_ADDRESS "\x07""address"
#define MOD_INTERFACE "\x09""interface"
const yp_item_t queryacl_conf[] = {
{ MOD_ADDRESS, YP_TNET, YP_VNONE, YP_FMULTI },
{ MOD_INTERFACE, YP_TNET, YP_VNONE, YP_FMULTI },
{ NULL }
};
typedef struct {
knotd_conf_t allow_addr;
knotd_conf_t allow_iface;
} queryacl_ctx_t;
static knotd_state_t queryacl_process(knotd_state_t state, knot_pkt_t *pkt,
knotd_qdata_t *qdata, knotd_mod_t *mod)
{
assert(pkt && qdata && mod);
queryacl_ctx_t *ctx = knotd_mod_ctx(mod);
// Continue only for regular queries.
if (qdata->type != KNOTD_QUERY_TYPE_NORMAL) {
return state;
}
if (ctx->allow_addr.count > 0) {
const struct sockaddr_storage *addr = knotd_qdata_remote_addr(qdata);
if (!knotd_conf_addr_range_match(&ctx->allow_addr, addr)) {
qdata->rcode = KNOT_RCODE_NOTAUTH;
return KNOTD_STATE_FAIL;
}
}
if (ctx->allow_iface.count > 0) {
struct sockaddr_storage buff;
const struct sockaddr_storage *addr = knotd_qdata_local_addr(qdata, &buff);
if (!knotd_conf_addr_range_match(&ctx->allow_iface, addr)) {
qdata->rcode = KNOT_RCODE_NOTAUTH;
return KNOTD_STATE_FAIL;
}
}
return state;
}
int queryacl_load(knotd_mod_t *mod)
{
// Create module context.
queryacl_ctx_t *ctx = calloc(1, sizeof(queryacl_ctx_t));
if (ctx == NULL) {
return KNOT_ENOMEM;
}
ctx->allow_addr = knotd_conf_mod(mod, MOD_ADDRESS);
ctx->allow_iface = knotd_conf_mod(mod, MOD_INTERFACE);
knotd_mod_ctx_set(mod, ctx);
return knotd_mod_hook(mod, KNOTD_STAGE_BEGIN, queryacl_process);
}
void queryacl_unload(knotd_mod_t *mod)
{
queryacl_ctx_t *ctx = knotd_mod_ctx(mod);
if (ctx != NULL) {
knotd_conf_free(&ctx->allow_addr);
knotd_conf_free(&ctx->allow_iface);
}
free(ctx);
}
KNOTD_MOD_API(queryacl, KNOTD_MOD_FLAG_SCOPE_ANY,
queryacl_load, queryacl_unload, queryacl_conf, NULL);
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