confio.c 32.1 KB
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/*  Copyright (C) 2019 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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    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
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    along with this program.  If not, see <https://www.gnu.org/licenses/>.
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*/

#include <assert.h>

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#include "knot/common/log.h"
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#include "knot/conf/confdb.h"
#include "knot/conf/confio.h"
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#include "knot/conf/module.h"
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#include "knot/conf/tools.h"

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#define FCN(io)	(io->fcn != NULL) ? io->fcn(io) : KNOT_EOK;
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static void io_reset_val(
	conf_io_t *io,
	const yp_item_t *key0,
	const yp_item_t *key1,
	const uint8_t *id,
	size_t id_len,
	bool id_as_data,
	conf_val_t *val)
{
	io->key0 = key0;
	io->key1 = key1;
	io->id = id;
	io->id_len = id_len;
	io->id_as_data = id_as_data;
	io->data.val = val;
	io->data.bin = NULL;
}

static void io_reset_bin(
	conf_io_t *io,
	const yp_item_t *key0,
	const yp_item_t *key1,
	const uint8_t *id,
	size_t id_len,
	const uint8_t *bin,
	size_t bin_len)
{
	io_reset_val(io, key0, key1, id, id_len, false, NULL);
	io->data.bin = bin;
	io->data.bin_len = bin_len;
}

int conf_io_begin(
	bool child)
{
	assert(conf() != NULL);

	if (conf()->io.txn != NULL && !child) {
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		return KNOT_TXN_EEXISTS;
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	} else if (conf()->io.txn == NULL && child) {
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		return KNOT_TXN_ENOTEXISTS;
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	}

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	knot_db_txn_t *parent = conf()->io.txn;
	knot_db_txn_t *txn = (parent == NULL) ? conf()->io.txn_stack : parent + 1;
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	if (txn >= conf()->io.txn_stack + CONF_MAX_TXN_DEPTH) {
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		return KNOT_TXN_EEXISTS;
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	}

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	if (conf()->filename != NULL) {
		log_ctl_notice("control, persistent configuration database "
		               "not available");
	}

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	// Start the writing transaction.
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	int ret = knot_db_lmdb_txn_begin(conf()->db, txn, parent, 0);
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	if (ret != KNOT_EOK) {
		return ret;
	}

	conf()->io.txn = txn;

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	// Reset master transaction flags.
	if (!child) {
		conf()->io.flags = CONF_IO_FACTIVE;
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		if (conf()->io.zones != NULL) {
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			trie_clear(conf()->io.zones);
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		}
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	}

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	return KNOT_EOK;
}

int conf_io_commit(
	bool child)
{
	assert(conf() != NULL);

	if (conf()->io.txn == NULL ||
	    (child && conf()->io.txn == conf()->io.txn_stack)) {
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		return KNOT_TXN_ENOTEXISTS;
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	}

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	knot_db_txn_t *txn = child ? conf()->io.txn : conf()->io.txn_stack;
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	// Commit the writing transaction.
	int ret = conf()->api->txn_commit(txn);

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	conf()->io.txn = child ? txn - 1 : NULL;
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	return ret;
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}

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void conf_io_abort(
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	bool child)
{
	assert(conf() != NULL);

	if (conf()->io.txn == NULL ||
	    (child && conf()->io.txn == conf()->io.txn_stack)) {
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		return;
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	}

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	knot_db_txn_t *txn = child ? conf()->io.txn : conf()->io.txn_stack;
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	// Abort the writing transaction.
	conf()->api->txn_abort(txn);
	conf()->io.txn = child ? txn - 1 : NULL;
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	// Reset master transaction flags.
	if (!child) {
		conf()->io.flags = YP_FNONE;
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		if (conf()->io.zones != NULL) {
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			trie_clear(conf()->io.zones);
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		}
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	}
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}

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static int list_section(
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	const yp_item_t *items,
	const yp_item_t **item,
	conf_io_t *io)
{
	for (*item = items; (*item)->name != NULL; (*item)++) {
		int ret = FCN(io);
		if (ret != KNOT_EOK) {
			return ret;
		}
	}

	return KNOT_EOK;
}

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int conf_io_list(
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	const char *key0,
	conf_io_t *io)
{
	if (io == NULL) {
		return KNOT_EINVAL;
	}

	assert(conf() != NULL);

	// List schema sections by default.
	if (key0 == NULL) {
		io_reset_val(io, NULL, NULL, NULL, 0, false, NULL);

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		return list_section(conf()->schema, &io->key0, io);
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	}

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	yp_check_ctx_t *ctx = yp_schema_check_init(&conf()->schema);
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	if (ctx == NULL) {
		return KNOT_ENOMEM;
	}

	// Check the input.
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	int ret = yp_schema_check_str(ctx, key0, NULL, NULL, NULL);
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	if (ret != KNOT_EOK) {
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		goto list_error;
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	}

	yp_node_t *node = &ctx->nodes[ctx->current];

	// Check for non-group item.
	if (node->item->type != YP_TGRP) {
		ret = KNOT_ENOTSUP;
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		goto list_error;
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	}

	io_reset_val(io, node->item, NULL, NULL, 0, false, NULL);

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	ret = list_section(node->item->sub_items, &io->key1, io);
list_error:
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	yp_schema_check_deinit(ctx);
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	return ret;
}

static int diff_item(
	conf_io_t *io)
{
	// Process an identifier item.
	if ((io->key0->flags & YP_FMULTI) != 0 && io->key0->var.g.id == io->key1) {
		bool old_id, new_id;

		// Check if a removed identifier.
		int ret = conf_db_get(conf(), &conf()->read_txn, io->key0->name,
		                      NULL, io->id, io->id_len, NULL);
		switch (ret) {
		case KNOT_EOK:
			old_id = true;
			break;
		case KNOT_ENOENT:
		case KNOT_YP_EINVAL_ID:
			old_id = false;
			break;
		default:
			return ret;
		}

		// Check if an added identifier.
		ret = conf_db_get(conf(), conf()->io.txn, io->key0->name, NULL,
		                  io->id, io->id_len, NULL);
		switch (ret) {
		case KNOT_EOK:
			new_id = true;
			break;
		case KNOT_ENOENT:
		case KNOT_YP_EINVAL_ID:
			new_id = false;
			break;
		default:
			return ret;
		}

		// Check if valid identifier.
		if (!old_id && !new_id) {
			return KNOT_YP_EINVAL_ID;
		}

		if (old_id != new_id) {
			io->id_as_data = true;
			io->type = old_id ? OLD : NEW;

			// Process the callback.
			ret = FCN(io);

			// Reset the modified parameters.
			io->id_as_data = false;
			io->type = NONE;

			if (ret != KNOT_EOK) {
				return ret;
			}
		}

		return KNOT_EOK;
	}

	conf_val_t old_val, new_val;

	// Get the old item value.
	conf_db_get(conf(), &conf()->read_txn, io->key0->name, io->key1->name,
	            io->id, io->id_len, &old_val);
	switch (old_val.code) {
	case KNOT_EOK:
		break;
	case KNOT_ENOENT:
	case KNOT_YP_EINVAL_ID:
		break;
	default:
		return old_val.code;
	}

	// Get the new item value.
	conf_db_get(conf(), conf()->io.txn, io->key0->name, io->key1->name,
	            io->id, io->id_len, &new_val);
	switch (new_val.code) {
	case KNOT_EOK:
		break;
	case KNOT_ENOENT:
	case KNOT_YP_EINVAL_ID:
		if (old_val.code != KNOT_EOK) {
			return KNOT_EOK;
		}
		break;
	default:
		return new_val.code;
	}

	// Process the value difference.
	if (old_val.code != KNOT_EOK) {
		io->data.val = &new_val;
		io->type = NEW;
		int ret = FCN(io);
		if (ret != KNOT_EOK) {
			return ret;
		}
	} else if (new_val.code != KNOT_EOK) {
		io->data.val = &old_val;
		io->type = OLD;
		int ret = FCN(io);
		if (ret != KNOT_EOK) {
			return ret;
		}
	} else if (!conf_val_equal(&old_val, &new_val)) {
		io->data.val = &old_val;
		io->type = OLD;
		int ret = FCN(io);
		if (ret != KNOT_EOK) {
			return ret;
		}

		io->data.val = &new_val;
		io->type = NEW;
		ret = FCN(io);
		if (ret != KNOT_EOK) {
			return ret;
		}
	}

	// Reset the modified parameters.
	io->data.val = NULL;
	io->type = NONE;

	return KNOT_EOK;
}

static int diff_section(
	conf_io_t *io)
{
	// Get the value for the specified item.
	if (io->key1 != NULL) {
		return diff_item(io);
	}

	// Get the values for all items.
	for (yp_item_t *i = io->key0->sub_items; i->name != NULL; i++) {
		io->key1 = i;

		int ret = diff_item(io);

		// Reset the modified parameters.
		io->key1 = NULL;

		if (ret != KNOT_EOK) {
			return ret;
		}
	}

	return KNOT_EOK;
}

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static int diff_iter_section(
	conf_io_t *io)
{
	// First compare the section with the old and common identifiers.
	conf_iter_t iter;
	int ret = conf_db_iter_begin(conf(), &conf()->read_txn, io->key0->name,
	                             &iter);
	switch (ret) {
	case KNOT_EOK:
		break;
	case KNOT_ENOENT:
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		// Continue to the second step.
		ret = KNOT_EOF;
		break;
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	default:
		return ret;
	}

	while (ret == KNOT_EOK) {
		ret = conf_db_iter_id(conf(), &iter, &io->id, &io->id_len);
		if (ret != KNOT_EOK) {
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		ret = diff_section(io);
		if (ret != KNOT_EOK) {
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		ret = conf_db_iter_next(conf(), &iter);
	}
	if (ret != KNOT_EOF) {
		return ret;
	}

	// Second compare the section with the new identifiers.
	ret = conf_db_iter_begin(conf(), conf()->io.txn, io->key0->name, &iter);
	switch (ret) {
	case KNOT_EOK:
		break;
	case KNOT_ENOENT:
		return KNOT_EOK;
	default:
		return ret;
	}

	while (ret == KNOT_EOK) {
		ret = conf_db_iter_id(conf(), &iter, &io->id, &io->id_len);
		if (ret != KNOT_EOK) {
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		// Ignore old and common identifiers.
		ret = conf_db_get(conf(), &conf()->read_txn, io->key0->name,
		                  NULL, io->id, io->id_len, NULL);
		switch (ret) {
		case KNOT_EOK:
			ret = conf_db_iter_next(conf(), &iter);
			continue;
		case KNOT_ENOENT:
		case KNOT_YP_EINVAL_ID:
			break;
		default:
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		ret = diff_section(io);
		if (ret != KNOT_EOK) {
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		ret = conf_db_iter_next(conf(), &iter);
	}
	if (ret != KNOT_EOF) {
		return ret;
	}

	return KNOT_EOK;
}

static int diff_zone_section(
	conf_io_t *io)
{
	assert(io->key0->flags & CONF_IO_FZONE);

	if (conf()->io.zones == NULL) {
		return KNOT_EOK;
	}

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	trie_it_t *it = trie_it_begin(conf()->io.zones);
	for (; !trie_it_finished(it); trie_it_next(it)) {
		io->id = (const uint8_t *)trie_it_key(it, &io->id_len);
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		// Get the difference for specific zone.
		int ret = diff_section(io);
		if (ret != KNOT_EOK) {
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			trie_it_free(it);
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			return ret;
		}
	}
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	trie_it_free(it);
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	return KNOT_EOK;
}

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int conf_io_diff(
	const char *key0,
	const char *key1,
	const char *id,
	conf_io_t *io)
{
	if (io == NULL) {
		return KNOT_EINVAL;
	}

	assert(conf() != NULL);

	if (conf()->io.txn == NULL) {
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		return KNOT_TXN_ENOTEXISTS;
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	}

	// Compare all sections by default.
	if (key0 == NULL) {
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		for (yp_item_t *i = conf()->schema; i->name != NULL; i++) {
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			// Skip non-group item.
			if (i->type != YP_TGRP) {
				continue;
			}

			int ret = conf_io_diff(i->name + 1, key1, NULL, io);

			// Reset parameters after each section.
			io_reset_val(io, NULL, NULL, NULL, 0, false, NULL);

			if (ret != KNOT_EOK) {
				return ret;
			}
		}

		return KNOT_EOK;
	}

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	yp_check_ctx_t *ctx = yp_schema_check_init(&conf()->schema);
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	if (ctx == NULL) {
		return KNOT_ENOMEM;
	}

	// Check the input.
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	int ret = yp_schema_check_str(ctx, key0, key1, id, NULL);
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	if (ret != KNOT_EOK) {
		goto diff_error;
	}

	yp_node_t *node = &ctx->nodes[ctx->current];
	yp_node_t *parent = node->parent;

	// Key1 is not a group identifier.
	if (parent != NULL) {
		io_reset_val(io, parent->item, node->item, parent->id,
		             parent->id_len, false, NULL);
	// Key1 is a group identifier.
	} else if (key1 != NULL && strlen(key1) != 0) {
		assert(node->item->type == YP_TGRP &&
		       (node->item->flags & YP_FMULTI) != 0);

		io_reset_val(io, node->item, node->item->var.g.id, node->id,
		             node->id_len, true, NULL);
	// No key1 specified.
	} else {
		io_reset_val(io, node->item, NULL, node->id, node->id_len,
		             false, NULL);
	}

	// Check for a non-group item.
	if (io->key0->type != YP_TGRP) {
		ret = KNOT_ENOTSUP;
		goto diff_error;
	}

	// Compare the section with all identifiers by default.
	if ((io->key0->flags & YP_FMULTI) != 0 && io->id_len == 0) {
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		// The zone section has an optimized diff.
		if (io->key0->flags & CONF_IO_FZONE) {
			// Full diff by default.
			if (!(conf()->io.flags & CONF_IO_FACTIVE)) {
				ret = diff_iter_section(io);
			// Full diff if all zones changed.
			} else if (conf()->io.flags & CONF_IO_FDIFF_ZONES) {
				ret = diff_iter_section(io);
			// Optimized diff for specific zones.
			} else {
				ret = diff_zone_section(io);
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			}
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		} else {
			ret = diff_iter_section(io);
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		}

		goto diff_error;
	}

	// Compare the section with a possible identifier.
	ret = diff_section(io);
diff_error:
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	yp_schema_check_deinit(ctx);
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	return ret;
}

static int get_section(
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	knot_db_txn_t *txn,
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	conf_io_t *io)
{
	conf_val_t data;

	// Get the value for the specified item.
	if (io->key1 != NULL) {
		if (!io->id_as_data) {
			// Get the item value.
			conf_db_get(conf(), txn, io->key0->name, io->key1->name,
			            io->id, io->id_len, &data);
			switch (data.code) {
			case KNOT_EOK:
				break;
			case KNOT_ENOENT:
				return KNOT_EOK;
			default:
				return data.code;
			}

			io->data.val = &data;
		}

		// Process the callback.
		int ret = FCN(io);

		// Reset the modified parameters.
		io->data.val = NULL;

		return ret;
	}

	// Get the values for all section items by default.
	for (yp_item_t *i = io->key0->sub_items; i->name != NULL; i++) {
		// Process the (first) identifier item.
		if ((io->key0->flags & YP_FMULTI) != 0 && io->key0->var.g.id == i) {
			// Check if existing identifier.
			conf_db_get(conf(), txn, io->key0->name, NULL, io->id,
			            io->id_len, &data);
			switch (data.code) {
			case KNOT_EOK:
				break;
			case KNOT_ENOENT:
				continue;
			default:
				return data.code;
			}

			io->key1 = i;
			io->id_as_data = true;

			// Process the callback.
			int ret = FCN(io);

			// Reset the modified parameters.
			io->key1 = NULL;
			io->id_as_data = false;

			if (ret != KNOT_EOK) {
				return ret;
			}

			continue;
		}

		// Get the item value.
		conf_db_get(conf(), txn, io->key0->name, i->name, io->id,
		            io->id_len, &data);
		switch (data.code) {
		case KNOT_EOK:
			break;
		case KNOT_ENOENT:
			continue;
		default:
			return data.code;
		}

		io->key1 = i;
		io->data.val = &data;

		// Process the callback.
		int ret = FCN(io);

		// Reset the modified parameters.
		io->key1 = NULL;
		io->data.val = NULL;

		if (ret != KNOT_EOK) {
			return ret;
		}
	}

	return KNOT_EOK;
}

int conf_io_get(
	const char *key0,
	const char *key1,
	const char *id,
	bool get_current,
	conf_io_t *io)
{
	if (io == NULL) {
		return KNOT_EINVAL;
	}

	assert(conf() != NULL);

	if (conf()->io.txn == NULL && !get_current) {
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		return KNOT_TXN_ENOTEXISTS;
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	}

	// List all sections by default.
	if (key0 == NULL) {
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		for (yp_item_t *i = conf()->schema; i->name != NULL; i++) {
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			// Skip non-group item.
			if (i->type != YP_TGRP) {
				continue;
			}

			int ret = conf_io_get(i->name + 1, key1, NULL,
			                      get_current, io);
			// Reset parameters after each section.
			io_reset_val(io, NULL, NULL, NULL, 0, false, NULL);
			if (ret != KNOT_EOK) {
				return ret;
			}
		}

		return KNOT_EOK;
	}

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	yp_check_ctx_t *ctx = yp_schema_check_init(&conf()->schema);
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	if (ctx == NULL) {
		return KNOT_ENOMEM;
	}

	// Check the input.
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	int ret = yp_schema_check_str(ctx, key0, key1, id, NULL);
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	if (ret != KNOT_EOK) {
		goto get_error;
	}

	yp_node_t *node = &ctx->nodes[ctx->current];
	yp_node_t *parent = node->parent;

	// Key1 is not a group identifier.
	if (parent != NULL) {
		io_reset_val(io, parent->item, node->item, parent->id,
		             parent->id_len, false, NULL);
	// Key1 is a group identifier.
	} else if (key1 != NULL && strlen(key1) != 0) {
		assert(node->item->type == YP_TGRP &&
		       (node->item->flags & YP_FMULTI) != 0);

		io_reset_val(io, node->item, node->item->var.g.id, node->id,
		             node->id_len, true, NULL);
	// No key1 specified.
	} else {
		io_reset_val(io, node->item, NULL, node->id, node->id_len, false,
		             NULL);
	}

737
	knot_db_txn_t *txn = get_current ? &conf()->read_txn : conf()->io.txn;
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782

	// Check for a non-group item.
	if (io->key0->type != YP_TGRP) {
		ret = KNOT_ENOTSUP;
		goto get_error;
	}

	// List the section with all identifiers by default.
	if ((io->key0->flags & YP_FMULTI) != 0 && io->id_len == 0) {
		conf_iter_t iter;
		ret = conf_db_iter_begin(conf(), txn, io->key0->name, &iter);
		switch (ret) {
		case KNOT_EOK:
			break;
		case KNOT_ENOENT:
			ret = KNOT_EOK;
			goto get_error;
		default:
			goto get_error;
		}

		while (ret == KNOT_EOK) {
			// Set the section identifier.
			ret = conf_db_iter_id(conf(), &iter, &io->id, &io->id_len);
			if (ret != KNOT_EOK) {
				conf_db_iter_finish(conf(), &iter);
				goto get_error;
			}

			ret = get_section(txn, io);
			if (ret != KNOT_EOK) {
				conf_db_iter_finish(conf(), &iter);
				goto get_error;
			}

			ret = conf_db_iter_next(conf(), &iter);
		}

		ret = KNOT_EOK;
		goto get_error;
	}

	// List the section with a possible identifier.
	ret = get_section(txn, io);
get_error:
783
	yp_schema_check_deinit(ctx);
784 785 786 787

	return ret;
}

788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
static void upd_changes(
	const conf_io_t *io,
	conf_io_type_t type,
	yp_flag_t flags,
	bool any_id)
{
	// Update common flags.
	conf()->io.flags |= flags;

	// Return if not important change.
	if (type == CONF_IO_TNONE) {
		return;
	}

	// Update reference item.
	if (flags & CONF_IO_FREF) {
		// Expected an identifier, which cannot be changed.
		assert(type != CONF_IO_TCHANGE);

		// Re-check and reload all zones if a reference has been removed.
		if (type == CONF_IO_TUNSET) {
			conf()->io.flags |= CONF_IO_FCHECK_ZONES | CONF_IO_FRLD_ZONES;
		}
		return;
	// Return if no specific zone operation.
	} else if (!(flags & CONF_IO_FZONE)) {
		return;
	}

	// Don't process each zone individually, process all instead.
	if (any_id) {
		// Diff all zone changes.
		conf()->io.flags |= CONF_IO_FCHECK_ZONES | CONF_IO_FDIFF_ZONES;

		// Reload just with important changes.
		if (flags & CONF_IO_FRLD_ZONE) {
			conf()->io.flags |= CONF_IO_FRLD_ZONES;
		}
		return;
	}

	// Prepare zone changes storage if it doesn't exist.
830
	trie_t *zones = conf()->io.zones;
831
	if (zones == NULL) {
832
		zones = trie_create(NULL);
833 834 835 836 837 838 839
		if (zones == NULL) {
			return;
		}
		conf()->io.zones = zones;
	}

	// Get zone status or create new.
840
	trie_val_t *val = trie_get_ins(zones, io->id, io->id_len);
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
	conf_io_type_t *current = (conf_io_type_t *)val;

	switch (type) {
	case CONF_IO_TSET:
		// Revert remove zone, but don't remove (probably changed).
		if (*current & CONF_IO_TUNSET) {
			*current &= ~CONF_IO_TUNSET;
		} else {
			// Must be a new zone.
			assert(*current == CONF_IO_TNONE);
			// Mark added zone.
			*current = type;
		}
		break;
	case CONF_IO_TUNSET:
		if (*current & CONF_IO_TSET) {
			// Remove inserted zone -> no change.
858
			trie_del(zones, io->id, io->id_len, NULL);
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
		} else {
			// Remove existing zone.
			*current |= type;
		}
		break;
	case CONF_IO_TCHANGE:
		*current |= type;
		// Mark zone to reload if required.
		if (flags & CONF_IO_FRLD_ZONE) {
			*current |= CONF_IO_TRELOAD;
		}
		break;
	case CONF_IO_TRELOAD:
	default:
		assert(0);
	}
}

877 878 879 880 881 882 883 884 885 886 887
static int set_item(
	conf_io_t *io)
{
	int ret = conf_db_set(conf(), conf()->io.txn, io->key0->name,
	                      (io->key1 != NULL) ? io->key1->name : NULL,
	                      io->id, io->id_len, io->data.bin, io->data.bin_len);
	if (ret != KNOT_EOK) {
		return ret;
	}

	// Postpone group callbacks to config check.
888
	if (io->key0->type == YP_TGRP && io->id_len == 0) {
889
		return KNOT_EOK;
890 891
	}

892
	knotd_conf_check_extra_t extra = {
893
		.conf = conf(),
894 895 896 897 898 899 900
		.txn = conf()->io.txn
	};
	knotd_conf_check_args_t args = {
		.item = (io->key1 != NULL) ? io->key1 :
		         ((io->id_len == 0) ? io->key0 : io->key0->var.g.id),
		.id = io->id,
		.id_len = io->id_len,
901
		.data = io->data.bin,
902 903
		.data_len = io->data.bin_len,
		.extra = &extra
904 905
	};

906 907 908 909 910 911 912 913
	// Call the item callbacks (include, item check, mod-id check).
	ret = conf_exec_callbacks(&args);
	if (ret != KNOT_EOK) {
		CONF_LOG(LOG_DEBUG, "item '%s' (%s)", args.item->name + 1,
		         args.err_str != NULL ? args.err_str : knot_strerror(ret));
	}

	return ret;
914 915 916 917 918 919
}

int conf_io_set(
	const char *key0,
	const char *key1,
	const char *id,
920
	const char *data)
921 922 923 924
{
	assert(conf() != NULL);

	if (conf()->io.txn == NULL) {
925
		return KNOT_TXN_ENOTEXISTS;
926 927 928 929 930 931 932
	}

	// At least key0 must be specified.
	if (key0 == NULL) {
		return KNOT_EINVAL;
	}

933
	yp_check_ctx_t *ctx = yp_schema_check_init(&conf()->schema);
934 935 936 937 938
	if (ctx == NULL) {
		return KNOT_ENOMEM;
	}

	// Check the input.
939
	int ret = yp_schema_check_str(ctx, key0, key1, id, data);
940 941 942 943 944 945 946
	if (ret != KNOT_EOK) {
		goto set_error;
	}

	yp_node_t *node = &ctx->nodes[ctx->current];
	yp_node_t *parent = node->parent;

947 948 949
	yp_flag_t upd_flags = node->item->flags;
	conf_io_type_t upd_type = CONF_IO_TNONE;

950 951
	conf_io_t io = { NULL };

952 953
	// Key1 is not a group identifier.
	if (parent != NULL) {
954 955 956 957
		if (node->data_len == 0) {
			ret = KNOT_YP_ENODATA;
			goto set_error;
		}
958 959
		upd_type = CONF_IO_TCHANGE;
		upd_flags |= parent->item->flags;
960
		io_reset_bin(&io, parent->item, node->item, parent->id,
961
		             parent->id_len, node->data, node->data_len);
962 963
	// A group identifier or whole group.
	} else if (node->item->type == YP_TGRP) {
964
		upd_type = CONF_IO_TSET;
965 966 967 968 969 970 971 972 973 974 975
		if ((node->item->flags & YP_FMULTI) != 0) {
			if (node->id_len == 0) {
				ret = KNOT_YP_ENOID;
				goto set_error;
			}
			upd_flags |= node->item->var.g.id->flags;
		} else {
			ret = KNOT_ENOTSUP;
			goto set_error;
		}
		assert(node->data_len == 0);
976
		io_reset_bin(&io, node->item, NULL, node->id, node->id_len,
977 978 979 980 981
		             NULL, 0);
	// A non-group item with data (include).
	} else if (node->data_len > 0) {
		io_reset_bin(&io, node->item, NULL, NULL, 0, node->data,
		             node->data_len);
982 983 984 985 986 987
	} else {
		ret = KNOT_YP_ENODATA;
		goto set_error;
	}

	// Set the item for all identifiers by default.
988 989
	if (io.key0->type == YP_TGRP && io.key1 != NULL &&
	    (io.key0->flags & YP_FMULTI) != 0 && io.id_len == 0) {
990
		conf_iter_t iter;
991
		ret = conf_db_iter_begin(conf(), conf()->io.txn, io.key0->name,
992 993 994 995 996 997 998 999 1000 1001 1002
		                         &iter);
		switch (ret) {
		case KNOT_EOK:
			break;
		case KNOT_ENOENT:
			ret = KNOT_EOK;
			goto set_error;
		default:
			goto set_error;
		}

1003 1004
		uint8_t copied_id[YP_MAX_ID_LEN];
		io.id = copied_id;
1005
		while (ret == KNOT_EOK) {
1006 1007 1008
			// Get the identifier and copy it because of next DB update.
			const uint8_t *tmp_id;
			ret = conf_db_iter_id(conf(), &iter, &tmp_id, &io.id_len);
1009 1010 1011 1012
			if (ret != KNOT_EOK) {
				conf_db_iter_finish(conf(), &iter);
				goto set_error;
			}
1013
			memcpy(copied_id, tmp_id, io.id_len);
1014 1015

			// Set the data.
1016
			ret = set_item(&io);
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
			if (ret != KNOT_EOK) {
				conf_db_iter_finish(conf(), &iter);
				goto set_error;
			}

			ret = conf_db_iter_next(conf(), &iter);
		}
		if (ret != KNOT_EOF) {
			goto set_error;
		}

1028
		upd_changes(&io, upd_type, upd_flags, true);
1029

1030 1031 1032 1033 1034
		ret = KNOT_EOK;
		goto set_error;
	}

	// Set the item with a possible identifier.
1035
	ret = set_item(&io);
1036 1037

	if (ret == KNOT_EOK) {
1038
		upd_changes(&io, upd_type, upd_flags, false);
1039
	}
1040
set_error:
1041
	yp_schema_check_deinit(ctx);
1042 1043 1044 1045 1046 1047 1048

	return ret;
}

static int unset_section_data(
	conf_io_t *io)
{
1049
	// Unset the value for the specified item.
1050 1051 1052 1053 1054 1055
	if (io->key1 != NULL) {
		return conf_db_unset(conf(), conf()->io.txn, io->key0->name,
		                     io->key1->name, io->id, io->id_len,
		                     io->data.bin, io->data.bin_len, false);
	}

1056
	// Unset the whole section by default.
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
	for (yp_item_t *i = io->key0->sub_items; i->name != NULL; i++) {
		// Skip the identifier item.
		if ((io->key0->flags & YP_FMULTI) != 0 && io->key0->var.g.id == i) {
			continue;
		}

		int ret = conf_db_unset(conf(), conf()->io.txn, io->key0->name,
		                        i->name, io->id, io->id_len, io->data.bin,
		                        io->data.bin_len, false);
		switch (ret) {
		case KNOT_EOK:
		case KNOT_ENOENT:
			continue;
		default:
			return ret;
		}
	}

	return KNOT_EOK;
}

static int unset_section(
	const yp_item_t *key0)
{
1081
	// Unset the section items.
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
	for (yp_item_t *i = key0->sub_items; i->name != NULL; i++) {
		// Skip the identifier item.
		if ((key0->flags & YP_FMULTI) != 0 && key0->var.g.id == i) {
			continue;
		}

		int ret = conf_db_unset(conf(), conf()->io.txn, key0->name,
		                        i->name, NULL, 0, NULL, 0, true);
		switch (ret) {
		case KNOT_EOK:
		case KNOT_ENOENT:
			continue;
		default:
			return ret;
		}
	}

1099
	// Unset the section.
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
	int ret = conf_db_unset(conf(), conf()->io.txn, key0->name, NULL, NULL,
	                        0, NULL, 0, false);
	switch (ret) {
	case KNOT_EOK:
	case KNOT_ENOENT:
		return KNOT_EOK;
	default:
		return ret;
	}
}

int conf_io_unset(
	const char *key0,
	const char *key1,
	const char *id,
	const char *data)
{
	assert(conf() != NULL);

	if (conf()->io.txn == NULL) {
1120
		return KNOT_TXN_ENOTEXISTS;
1121 1122
	}

1123
	// Unset all sections by default.
1124
	if (key0 == NULL) {
1125
		for (yp_item_t *i = conf()->schema; i->name != NULL; i++) {
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
			// Skip non-group item.
			if (i->type != YP_TGRP) {
				continue;
			}

			int ret = conf_io_unset(i->name + 1, key1, NULL, NULL);
			switch (ret) {
			case KNOT_EOK:
			case KNOT_ENOENT:
				break;
			default:
				return ret;
			}
		}

		return KNOT_EOK;
	}

1144
	yp_check_ctx_t *ctx = yp_schema_check_init(&conf()->schema);
1145 1146 1147 1148 1149
	if (ctx == NULL) {
		return KNOT_ENOMEM;
	}

	// Check the input.
1150
	int ret = yp_schema_check_str(ctx, key0, key1, id, data);
1151 1152 1153 1154 1155 1156 1157
	if (ret != KNOT_EOK) {
		goto unset_error;
	}

	yp_node_t *node = &ctx->nodes[ctx->current];
	yp_node_t *parent = node->parent;

1158 1159 1160
	yp_flag_t upd_flags = node->item->flags;
	conf_io_type_t upd_type = CONF_IO_TNONE;

1161 1162
	conf_io_t io = { NULL };

1163
	// Key1 is not a group identifier.
1164
	if (parent != NULL) {
1165 1166
		upd_type = CONF_IO_TCHANGE;
		upd_flags |= parent->item->flags;
1167 1168
		io_reset_bin(&io, parent->item, node->item, parent->id,
		             parent->id_len, node->data, node->data_len);
1169 1170 1171
	// A group identifier or whole group.
	} else if (node->item->type == YP_TGRP) {
		upd_type = CONF_IO_TUNSET;
1172
		if ((node->item->flags & YP_FMULTI) != 0) {
1173 1174
			upd_flags |= node->item->var.g.id->flags;
		}
1175
		assert(node->data_len == 0);
1176
		io_reset_bin(&io, node->item, NULL, node->id, node->id_len,
1177 1178 1179
		             NULL, 0);
	// A non-group item (include).
	} else {
1180 1181 1182 1183
		ret = KNOT_ENOTSUP;
		goto unset_error;
	}

1184
	// Unset the section with all identifiers by default.
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
	if ((io.key0->flags & YP_FMULTI) != 0 && io.id_len == 0) {
		conf_iter_t iter;
		ret = conf_db_iter_begin(conf(), conf()->io.txn, io.key0->name,
		                         &iter);
		switch (ret) {
		case KNOT_EOK:
			break;
		case KNOT_ENOENT:
			ret = KNOT_EOK;
			goto unset_error;
		default:
			goto unset_error;
		}

1199 1200
		uint8_t copied_id[YP_MAX_ID_LEN];
		io.id = copied_id;
1201
		while (ret == KNOT_EOK) {
1202 1203 1204
			// Get the identifier and copy it because of next DB update.
			const uint8_t *tmp_id;
			ret = conf_db_iter_id(conf(), &iter, &tmp_id, &io.id_len);
1205 1206 1207 1208
			if (ret != KNOT_EOK) {
				conf_db_iter_finish(conf(), &iter);
				goto unset_error;
			}
1209
			memcpy(copied_id, tmp_id, io.id_len);
1210

1211
			// Unset the section data.
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
			ret = unset_section_data(&io);
			switch (ret) {
			case KNOT_EOK:
			case KNOT_ENOENT:
				break;
			default:
				conf_db_iter_finish(conf(), &iter);
				goto unset_error;
			}

			ret = conf_db_iter_next(conf(), &iter);
		}
		if (ret != KNOT_EOF) {
			goto unset_error;
		}

		if (io.key1 == NULL) {
1229
			// Unset all identifiers.
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
			ret = conf_db_iter_begin(conf(), conf()->io.txn,
			                         io.key0->name, &iter);
			switch (ret) {
			case KNOT_EOK:
				break;
			case KNOT_ENOENT:
				ret = KNOT_EOK;
				goto unset_error;
			default:
				goto unset_error;
			}

			while (ret == KNOT_EOK) {
				ret = conf_db_iter_del(conf(), &iter);
				if (ret != KNOT_EOK) {
					conf_db_iter_finish(conf(), &iter);
					goto unset_error;
				}

				ret = conf_db_iter_next(conf(), &iter);
			}
			if (ret != KNOT_EOF) {
				goto unset_error;
			}

1255
			// Unset the section.
1256 1257 1258 1259 1260 1261
			ret = unset_section(io.key0);
			if (ret != KNOT_EOK) {
				goto unset_error;
			}
		}

1262 1263
		upd_changes(&io, upd_type, upd_flags, true);

1264 1265 1266 1267
		ret = KNOT_EOK;
		goto unset_error;
	}

1268
	// Unset the section data.
1269 1270 1271 1272 1273 1274
	ret = unset_section_data(&io);
	if (ret != KNOT_EOK) {
		goto unset_error;
	}

	if (io.key1 == NULL) {
1275
		// Unset the identifier.
1276 1277 1278 1279 1280 1281
		if (io.id_len != 0) {
			ret = conf_db_unset(conf(), conf()->io.txn, io.key0->name,
			                    NULL, io.id, io.id_len, NULL, 0, false);
			if (ret != KNOT_EOK) {
				goto unset_error;
			}
1282
		// Unset the section.
1283 1284 1285 1286 1287 1288 1289
		} else {
			ret = unset_section(io.key0);
			if (ret != KNOT_EOK) {
				goto unset_error;
			}
		}
	}
1290 1291 1292 1293

	if (ret == KNOT_EOK) {
		upd_changes(&io, upd_type, upd_flags, false);
	}
1294
unset_error:
1295
	yp_schema_check_deinit(ctx);
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305

	return ret;
}

static int check_section(
	const yp_item_t *group,
	const uint8_t *id,
	size_t id_len,
	conf_io_t *io)
{
1306
	knotd_conf_check_extra_t extra = {
1307 1308
		.conf = conf(),
		.txn = conf()->io.txn,
1309 1310 1311
		.check = true
	};
	knotd_conf_check_args_t args = {
1312
		.id = id,
1313 1314
		.id_len = id_len,
		.extra = &extra
1315 1316 1317 1318 1319 1320 1321 1322 1323
	};

	bool non_empty = false;

	for (yp_item_t *item = group->sub_items; item->name != NULL; item++) {
		args.item = item;

		// Check the identifier.
		if ((group->flags & YP_FMULTI) != 0 && group->var.g.id == item) {
1324
			io->error.code = conf_exec_callbacks(&args);
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
			if (io->error.code != KNOT_EOK) {
				io_reset_val(io, group, item, NULL, 0, false, NULL);
				goto check_section_error;
			}
			continue;
		}

		// Get the item value.
		conf_val_t bin;
		conf_db_get(conf(), conf()->io.txn, group->name, item->name, id,
		            id_len, &bin);
		if (bin.code == KNOT_ENOENT) {
			continue;
		} else if (bin.code != KNOT_EOK) {
			return bin.code;
		}

		non_empty = true;

		// Check the item value(s).
		size_t values = conf_val_count(&bin);
		for (size_t i = 1; i <= values; i++) {
			conf_val(&bin);
			args.data = bin.data;
			args.data_len = bin.len;

1351
			io->error.code = conf_exec_callbacks(&args);
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
			if (io->error.code != KNOT_EOK) {
				io_reset_val(io, group, item, id, id_len, false,
				             &bin);
				io->data.index = i;
				goto check_section_error;
			}

			if (values > 1) {
				conf_val_next(&bin);
			}
		}
	}

	// Check the whole section if not empty.
	if (id != NULL || non_empty) {
		args.item = group;
		args.data = NULL;
		args.data_len = 0;

1371
		io->error.code = conf_exec_callbacks(&args);
1372 1373 1374 1375 1376 1377 1378 1379 1380 1381
		if (io->error.code != KNOT_EOK) {
			io_reset_val(io, group, NULL, id, id_len, false, NULL);
			goto check_section_error;
		}
	}

	return KNOT_EOK;

check_section_error:
	io->error.str = args.err_str;
1382 1383 1384 1385 1386
	int ret = FCN(io);
	if (ret == KNOT_EOK) {
		return io->error.code;
	}
	return ret;
1387 1388
}

1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
static int check_iter_section(
	const yp_item_t *item,
	conf_io_t *io)
{
	// Iterate over all identifiers.
	conf_iter_t iter;
	int ret = conf_db_iter_begin(conf(), conf()->io.txn, item->name, &iter);
	switch (ret) {
	case KNOT_EOK:
		break;
	case KNOT_ENOENT:
		return KNOT_EOK;
	default:
		return ret;
	}

	while (ret == KNOT_EOK) {
		size_t id_len;
		const uint8_t *id;
		ret = conf_db_iter_id(conf(), &iter, &id, &id_len);
		if (ret != KNOT_EOK) {
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		// Check specific section item.
		ret = check_section(item, id, id_len, io);
		if (ret != KNOT_EOK) {
			conf_db_iter_finish(conf(), &iter);
			return ret;
		}

		ret = conf_db_iter_next(conf(), &iter);
	}
	if (ret != KNOT_EOF) {
		return ret;
	}

	return KNOT_EOK;
}

static int check_zone_section(
	const yp_item_t *item,
	conf_io_t *io)
{
	assert(item->flags & CONF_IO_FZONE);

	if (conf()->io.zones == NULL) {
		return KNOT_EOK;
	}

1440 1441
	trie_it_t *it = trie_it_begin(conf()->io.zones);
	for (; !trie_it_finished(it); trie_it_next(it)) {
1442
		size_t id_len;
1443
		const uint8_t *id = (const uint8_t *)trie_it_key(it, &id_len);
1444

1445
		conf_io_type_t type = (conf_io_type_t)(*trie_it_val(it));
1446 1447 1448 1449 1450 1451 1452 1453
		if (type == CONF_IO_TUNSET) {
			// Nothing to check.
			continue;
		}

		// Check specific zone.
		int ret = check_section(item, id, id_len, io);
		if (ret != KNOT_EOK) {
1454
			trie_it_free(it);
1455 1456 1457
			return ret;
		}
	}
1458
	trie_it_free(it);
1459 1460 1461 1462

	return KNOT_EOK;
}

1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
int conf_io_check(
	conf_io_t *io)
{
	if (io == NULL) {
		return KNOT_EINVAL;
	}

	assert(conf() != NULL);

	if (conf()->io.txn == NULL) {
1473
		return KNOT_TXN_ENOTEXISTS;
1474 1475 1476 1477
	}

	int ret;

1478 1479
	// Iterate over the schema.
	for (yp_item_t *item = conf()->schema; item->name != NULL; item++) {
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
		// Skip non-group items (include).
		if (item->type != YP_TGRP) {
			continue;
		}

		// Check simple group without identifiers.
		if ((item->flags & YP_FMULTI) == 0) {
			ret = check_section(item, NULL, 0, io);
			if (ret != KNOT_EOK) {
				goto check_error;
			}
			continue;
		}

1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
		// The zone section has an optimized check.
		if (item->flags & CONF_IO_FZONE) {
			// Full check by default.
			if (!(conf()->io.flags & CONF_IO_FACTIVE)) {
				ret = check_iter_section(item, io);
			// Full check if all zones changed.
			} else if (conf()->io.flags & CONF_IO_FCHECK_ZONES) {
				ret = check_iter_section(item, io);
			// Optimized check for specific zones.
			} else {
				ret = check_zone_section(item, io);
1505
			}
1506 1507
		} else {
			ret = check_iter_section(item, io);
1508
		}
1509
		if (ret != KNOT_EOK) {
1510 1511 1512 1513 1514 1515
			goto check_error;
		}
	}

	ret = KNOT_EOK;
check_error:
1516
	conf_mod_load_purge(conf(), true);
1517 1518 1519

	return ret;
}