tcp_conn_limit.h File Reference

This file keeps track of the limit on the number of TCP connections each client makes the server. More...

#include "util/storage/dnstree.h"
#include "util/locks.h"

Data Structures
struct	tcl_list
	TCP connection limit storage structure. More...
struct	tcl_addr
	An address span with connection limit information. More...

Functions
struct tcl_list *	tcl_list_create (void)
	Create TCP connection limit structure.
void	tcl_list_delete (struct tcl_list *tcl)
	Delete TCP connection limit structure.
int	tcl_list_apply_cfg (struct tcl_list *tcl, struct config_file *cfg)
	Process TCP connection limit config.
int	tcl_new_connection (struct tcl_addr *tcl)
	Increment TCP connection count if found, provided the count was below the limit.
void	tcl_close_connection (struct tcl_addr *tcl)
	Decrement TCP connection count if found.
struct tcl_addr *	tcl_addr_lookup (struct tcl_list *tcl, struct sockaddr_storage *addr, socklen_t addrlen)
	Lookup address to see its TCP connection limit structure.
size_t	tcl_list_get_mem (struct tcl_list *tcl)
	Get memory used by TCP connection limit structure.

Detailed Description

This file keeps track of the limit on the number of TCP connections each client makes the server.

Function Documentation

tcl_list_create()

struct tcl_list * tcl_list_create

(

void

)

Create TCP connection limit structure.

Returns

new structure or NULL on error.

References tcl_list::region, regional_create(), and tcl_list_delete().

Referenced by daemon_init().

tcl_list_delete()

void tcl_list_delete

(

struct tcl_list *

tcl

)

Delete TCP connection limit structure.

Parameters

tcl	to delete.

References tcl_list::region, regional_destroy(), traverse_postorder(), and tcl_list::tree.

Referenced by daemon_delete(), daemon_init(), and tcl_list_create().

tcl_list_apply_cfg()

int tcl_list_apply_cfg	(	struct tcl_list *	tcl,
		struct config_file *	cfg
	)

Process TCP connection limit config.

Parameters

tcl	where to store.
cfg	config options.

Returns

0 on error.

References addr_tree_init(), addr_tree_init_parents(), read_tcl_list(), tcl_list::region, regional_free_all(), and tcl_list::tree.

Referenced by daemon_fork().

tcl_new_connection()

int tcl_new_connection

(

struct tcl_addr *

tcl

)

Increment TCP connection count if found, provided the count was below the limit.

Parameters

tcl	structure for tcl storage, or NULL.

Returns

: 0 if limit reached, 1 if tcl was NULL or limit not reached.

References tcl_addr::count, tcl_addr::limit, and tcl_addr::lock.

Referenced by comm_point_perform_accept().

tcl_close_connection()

void tcl_close_connection

(

struct tcl_addr *

tcl

)

Decrement TCP connection count if found.

Parameters

tcl	structure for tcl storage, or NULL.

References tcl_addr::count, tcl_addr::lock, and log_assert.

Referenced by comm_point_close().

tcl_addr_lookup()

struct tcl_addr * tcl_addr_lookup	(	struct tcl_list *	tcl,
		struct sockaddr_storage *	addr,
		socklen_t	addrlen
	)

Lookup address to see its TCP connection limit structure.

Parameters

tcl	structure for address storage.
addr	address to check
addrlen	length of addr.

Returns

: tcl structure from this address.

References addr_tree_lookup(), and tcl_list::tree.

Referenced by comm_point_perform_accept().

tcl_list_get_mem()

size_t tcl_list_get_mem

(

struct tcl_list *

tcl

)

Get memory used by TCP connection limit structure.

Parameters

tcl	structure for address storage.

Returns

bytes in use.

References tcl_list::region, and regional_get_mem().