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135 lines
4.7 KiB
C
135 lines
4.7 KiB
C
/*
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*
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* libtcp-portmon.h: tcp port monitoring library.
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*
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* Copyright (C) 2005-2007 Philip Kovacs pkovacs@users.sourceforge.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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* USA. */
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#ifndef LIBTCP_PORTMON_H
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#define LIBTCP_PORTMON_H
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <netdb.h>
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/* connection deleted if unseen again after this # of refreshes */
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#define TCP_CONNECTION_STARTING_AGE 1
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#define BUILD_PORT_MONITORS_HASH_KEY_SIZE 12
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#define MAX_PORT_MONITOR_CONNECTIONS_DEFAULT 256
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/* -------------------------------------------------------------------
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* IMPLEMENTATION INTERFACE
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*
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* Implementation-specific interface begins here. Clients should not
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* manipulate these structures directly, nor call the defined helper
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* functions. Use the "Client interface" functions defined at bottom.
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* ------------------------------------------------------------------- */
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/* The inventory of peekable items within the port monitor. */
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enum tcp_port_monitor_peekables {
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COUNT = 0,
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REMOTEIP,
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REMOTEHOST,
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REMOTEPORT,
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REMOTESERVICE,
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LOCALIP,
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LOCALHOST,
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LOCALPORT,
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LOCALSERVICE
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};
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/* ------------------------------------------------------------
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* A port monitor
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*
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* The definition of the struct is hidden because it contains
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* C++-specific stuff and we want to #include this from C code.
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* ------------------------------------------------------------ */
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typedef struct _tcp_port_monitor_t tcp_port_monitor_t;
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/* ------------------------------------------------------------
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* A tcp port monitor collection
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*
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* The definition of the struct is hidden because it contains
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* C++-specific stuff and we want to #include this from C code.
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* ------------------------------------------------------------ */
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typedef struct _tcp_port_monitor_collection_t tcp_port_monitor_collection_t;
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/* ----------------------------------------------------------------------
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* CLIENT INTERFACE
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*
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* Clients should call only those functions below this line.
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* ---------------------------------------------------------------------- */
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/* struct to hold monitor creation arguments */
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typedef struct _tcp_port_monitor_args_t {
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/* monitor supports tracking at most this many connections */
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int max_port_monitor_connections;
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} tcp_port_monitor_args_t;
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/* ----------------------------------
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* Client operations on port monitors
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* ---------------------------------- */
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/* Clients use this function to get connection data from
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* the indicated port monitor.
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* The requested monitor value is copied into a client-supplied char buffer.
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* Returns 0 on success, -1 otherwise. */
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int peek_tcp_port_monitor(
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const tcp_port_monitor_t *p_monitor,
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/* (item of interest, from tcp_port_monitor_peekables enum) */
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int item,
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/* (0 to number of connections in monitor - 1) */
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int connection_index,
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/* buffer to receive requested value */
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char *p_buffer,
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/* size of p_buffer */
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size_t buffer_size);
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/* --------------------------------
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* Client operations on collections
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* -------------------------------- */
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/* Create a monitor collection. Do this one first. */
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tcp_port_monitor_collection_t *create_tcp_port_monitor_collection(void);
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/* Destroy the monitor collection (and everything it contains).
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* Do this one last. */
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void destroy_tcp_port_monitor_collection(
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tcp_port_monitor_collection_t *p_collection);
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/* Updates the tcp statistics for all monitors within a collection */
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void update_tcp_port_monitor_collection(
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tcp_port_monitor_collection_t *p_collection);
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/* Creation of redundant monitors is silently ignored
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* Returns 0 on success, -1 otherwise. */
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int insert_new_tcp_port_monitor_into_collection(
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tcp_port_monitor_collection_t *p_collection, in_port_t port_range_begin,
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in_port_t port_range_end, tcp_port_monitor_args_t *p_creation_args);
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/* Clients need a way to find monitors */
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tcp_port_monitor_t *find_tcp_port_monitor(
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tcp_port_monitor_collection_t *p_collection, in_port_t port_range_begin,
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in_port_t port_range_end);
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#endif
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