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📄 as112.h(2.22 KB)
📄 config_file.c(77.33 KB)
📄 config_file.h(40.38 KB)
📄 configlexer.lex(26.89 KB)
📄 configparser.y(101.23 KB)
📄 configyyrename.h(2.22 KB)
📁 data
📄 edns.c(5.04 KB)
📄 edns.h(3.86 KB)
📄 fptr_wlist.c(19.07 KB)
📄 fptr_wlist.h(12.78 KB)
📄 iana_ports.inc(31.81 KB)
📄 locks.c(7.88 KB)
📄 locks.h(12.53 KB)
📄 log.c(16.31 KB)
📄 log.h(7.5 KB)
📄 mini_event.c(9.73 KB)
📄 mini_event.h(6.51 KB)
📄 module.c(7.14 KB)
📄 module.h(31.35 KB)
📄 net_help.c(42.81 KB)
📄 net_help.h(16.12 KB)
📄 netevent.c(114.68 KB)
📄 netevent.h(33.92 KB)
📄 random.c(6.23 KB)
📄 random.h(2.98 KB)
📄 rbtree.c(16.08 KB)
📄 rbtree.h(6.23 KB)
📄 regional.c(6.24 KB)
📄 regional.h(5.37 KB)
📄 rtt.c(3.53 KB)
📄 rtt.h(3.57 KB)
📁 shm_side
📁 storage
📄 tcp_conn_limit.c(4.91 KB)
📄 tcp_conn_limit.h(3.88 KB)
📄 timehist.c(6.06 KB)
📄 timehist.h(3.81 KB)
📄 tube.c(17.71 KB)
📄 tube.h(8.4 KB)
📄 ub_event.c(11.67 KB)
📄 ub_event.h(5.07 KB)
📄 ub_event_pluggable.c(17.61 KB)
📄 winsock_event.c(21.16 KB)
📄 winsock_event.h(10.19 KB)

Editing: tcp_conn_limit.h

/*
 * daemon/tcp_conn_limit.h - client TCP connection limit storage for the server.
 *
 * Copyright (c) 2018, 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 keeps track of the limit on the number of TCP connections
 * each client makes the server.
 */

#ifndef DAEMON_TCP_CONN_LIMIT_H
#define DAEMON_TCP_CONN_LIMIT_H
#include "util/storage/dnstree.h"
#include "util/locks.h"
struct config_file;
struct regional;

/**
 * TCP connection limit storage structure
 */
struct tcl_list {
	/** regional for allocation */
	struct regional* region;
	/**
	 * Tree of the addresses that are TCP connection limited.
	 * contents of type tcl_addr.
	 */
	rbtree_type tree;
};

/**
 *
 * An address span with connection limit information
 */
struct tcl_addr {
	/** node in address tree */
	struct addr_tree_node node;
	/** lock on structure data */
	lock_quick_type lock;
	/** connection limit on this netblock */
	uint32_t limit;
	/** current connection count on this netblock */
	uint32_t count;
};

/**
 * Create TCP connection limit structure
 * @return new structure or NULL on error.
 */
struct tcl_list* tcl_list_create(void);

/**
 * Delete TCP connection limit structure.
 * @param tcl: to delete.
 */
void tcl_list_delete(struct tcl_list* tcl);

/**
 * Process TCP connection limit config.
 * @param tcl: where to store.
 * @param cfg: config options.
 * @return 0 on error.
 */
int tcl_list_apply_cfg(struct tcl_list* tcl, struct config_file* cfg);

/**
 * Increment TCP connection count if found, provided the
 * count was below the limit.
 * @param tcl: structure for tcl storage, or NULL.
 * @return: 0 if limit reached, 1 if tcl was NULL or limit not reached.
 */
int tcl_new_connection(struct tcl_addr* tcl);

/**
 * Decrement TCP connection count if found.
 * @param tcl: structure for tcl storage, or NULL.
 */
void tcl_close_connection(struct tcl_addr* tcl);

/**
 * Lookup address to see its TCP connection limit structure
 * @param tcl: structure for address storage.
 * @param addr: address to check
 * @param addrlen: length of addr.
 * @return: tcl structure from this address.
 */
struct tcl_addr*
tcl_addr_lookup(struct tcl_list* tcl, struct sockaddr_storage* addr,
        socklen_t addrlen);

/**
 * Get memory used by TCP connection limit structure.
 * @param tcl: structure for address storage.
 * @return bytes in use.
 */
size_t tcl_list_get_mem(struct tcl_list* tcl);

#endif /* DAEMON_TCP_CONN_LIMIT_H */

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Editing: tcp_conn_limit.h

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