natftpalg.h

vxworks下ppp的实现源码

/* natFtpAlg.h */

/* Copyright 2000-2003 Wind River Systems, Inc. */

/* @format.tab-size 4, @format.use-tabs true, @format.new-line lf */

/* WindNet NAT "installable" FTP Application Level Gateway (ALG) */

/*
modification history
--------------------
01a,24apr03,zhu  updated copyright
070201	tk	Added new data structures for new implementation of natFtpAlg.c to
			work with the upgraded ALG API.
061401	tk	Created to eliminate warning in compilation of prjConfig.c
*/

#ifndef __INCnatFtpAlgh
#define __INCnatFtpAlgh

/* NAT-FTP ALG header */

/* data structures */
typedef struct NAT_TRANSPORT
{
	char		*tcp_block_ptr;
	ULONG		global_address;
	USHORT		global_port;
} NAT_TRANSPORT;

/* function declarations */
STATUS natFtpInit(u_short);		/* FTP ALG agent initialization function */

STATUS ftp_get_tcp_entry(		/* for basic NAT, find matching ip entry */
	ULONG	local_address,
	char	*packet,
	NAT_TRANSPORT *transport);

STATUS ftp_get_global_transport(	/* for NAPT, get TCP entry */
	ULONG	local_address,
	USHORT	local_port,
	char	*packet,
	NAT_TRANSPORT *transport
	);

STATUS adjust_tcp_sequence(
	char	*tcp_packet,
	char	*old_string,
	char	*new_string,
	ULONG	new_string_length,
	ULONG	old_string_length,
	char	*tcp_entry);

#endif	/* __INCnatFtpAlgh */