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230 lines
8.4 KiB
C
230 lines
8.4 KiB
C
/*-
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* Copyright (c) 2001 Charles Mott <cm@linktel.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Alias_local.h contains the function prototypes for alias.c,
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* alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
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* as any future add-ons). It also includes macros, globals and
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* struct definitions shared by more than one alias*.c file.
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*
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* This include file is intended to be used only within the aliasing
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* software. Outside world interfaces are defined in alias.h
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*
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* This software is placed into the public domain with no restrictions
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* on its distribution.
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*
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* Initial version: August, 1996 (cjm)
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*
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* <updated several times by original author and Eivind Eklund>
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*/
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#ifndef _ALIAS_LOCAL_H_
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#define _ALIAS_LOCAL_H_
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/* Macros */
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/*
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* The following macro is used to update an
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* internet checksum. "delta" is a 32-bit
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* accumulation of all the changes to the
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* checksum (adding in new 16-bit words and
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* subtracting out old words), and "cksum"
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* is the checksum value to be updated.
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*/
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#define ADJUST_CHECKSUM(acc, cksum) \
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do { \
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acc += cksum; \
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if (acc < 0) { \
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acc = -acc; \
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acc = (acc >> 16) + (acc & 0xffff); \
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acc += acc >> 16; \
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cksum = (u_short) ~acc; \
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} else { \
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acc = (acc >> 16) + (acc & 0xffff); \
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acc += acc >> 16; \
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cksum = (u_short) acc; \
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} \
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} while (0)
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/* Globals */
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extern int packetAliasMode;
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/* Prototypes */
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/* General utilities */
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u_short IpChecksum(struct ip *_pip);
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u_short TcpChecksum(struct ip *_pip);
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void DifferentialChecksum(u_short *_cksum, u_short *_new, u_short *_old,
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int _n);
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/* Internal data access */
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struct alias_link *
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FindIcmpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _id_alias, int _create);
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struct alias_link *
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FindIcmpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _id, int _create);
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struct alias_link *
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FindFragmentIn1(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _ip_id);
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struct alias_link *
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FindFragmentIn2(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _ip_id);
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struct alias_link *
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AddFragmentPtrLink(struct in_addr _dst_addr, u_short _ip_id);
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struct alias_link *
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FindFragmentPtr(struct in_addr _dst_addr, u_short _ip_id);
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struct alias_link *
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FindProtoIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_char _proto);
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struct alias_link *
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FindProtoOut(struct in_addr _src_addr, struct in_addr _dst_addr,
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u_char _proto);
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struct alias_link *
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FindUdpTcpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _dst_port, u_short _alias_port, u_char _proto, int _create);
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struct alias_link *
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FindUdpTcpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _src_port, u_short _dst_port, u_char _proto, int _create);
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struct alias_link *
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AddPptp(struct in_addr _src_addr, struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _src_call_id);
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struct alias_link *
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FindPptpOutByCallId(struct in_addr _src_addr,
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struct in_addr _dst_addr, u_int16_t _src_call_id);
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struct alias_link *
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FindPptpInByCallId(struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _dst_call_id);
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struct alias_link *
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FindPptpOutByPeerCallId(struct in_addr _src_addr,
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struct in_addr _dst_addr, u_int16_t _dst_call_id);
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struct alias_link *
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FindPptpInByPeerCallId(struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _alias_call_id);
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struct alias_link *
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FindRtspOut(struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _src_port, u_short _alias_port, u_char _proto);
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struct in_addr
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FindOriginalAddress(struct in_addr _alias_addr);
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struct in_addr
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FindAliasAddress(struct in_addr _original_addr);
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/* External data access/modification */
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int FindNewPortGroup(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _src_port, u_short _dst_port, u_short _port_count,
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u_char _proto, u_char _align);
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void GetFragmentAddr(struct alias_link *_link, struct in_addr *_src_addr);
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void SetFragmentAddr(struct alias_link *_link, struct in_addr _src_addr);
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void GetFragmentPtr(struct alias_link *_link, char **_fptr);
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void SetFragmentPtr(struct alias_link *_link, char *fptr);
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void SetStateIn(struct alias_link *_link, int _state);
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void SetStateOut(struct alias_link *_link, int _state);
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int GetStateIn(struct alias_link *_link);
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int GetStateOut(struct alias_link *_link);
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struct in_addr
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GetOriginalAddress(struct alias_link *_link);
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struct in_addr
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GetDestAddress(struct alias_link *_link);
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struct in_addr
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GetAliasAddress(struct alias_link *_link);
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struct in_addr
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GetDefaultAliasAddress(void);
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void SetDefaultAliasAddress(struct in_addr _alias_addr);
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u_short GetOriginalPort(struct alias_link *_link);
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u_short GetAliasPort(struct alias_link *_link);
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struct in_addr
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GetProxyAddress(struct alias_link *_link);
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void SetProxyAddress(struct alias_link *_link, struct in_addr _addr);
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u_short GetProxyPort(struct alias_link *_link);
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void SetProxyPort(struct alias_link *_link, u_short _port);
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void SetAckModified(struct alias_link *_link);
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int GetAckModified(struct alias_link *_link);
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int GetDeltaAckIn(struct ip *_pip, struct alias_link *_link);
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int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_link);
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void AddSeq(struct ip *_pip, struct alias_link *_link, int _delta);
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void SetExpire(struct alias_link *_link, int _expire);
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void ClearCheckNewLink(void);
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void SetProtocolFlags(struct alias_link *_link, int _pflags);
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int GetProtocolFlags(struct alias_link *_link);
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void SetDestCallId(struct alias_link *_link, u_int16_t _cid);
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#ifndef NO_FW_PUNCH
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void PunchFWHole(struct alias_link *_link);
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#endif
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/* Housekeeping function */
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void HouseKeeping(void);
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/* Tcp specfic routines */
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/* lint -save -library Suppress flexelint warnings */
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/* FTP routines */
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void AliasHandleFtpOut(struct ip *_pip, struct alias_link *_link,
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int _maxpacketsize);
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/* IRC routines */
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void AliasHandleIrcOut(struct ip *_pip, struct alias_link *_link,
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int _maxsize);
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/* RTSP routines */
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void AliasHandleRtspOut(struct ip *_pip, struct alias_link *_link,
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int _maxpacketsize);
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/* PPTP routines */
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void AliasHandlePptpOut(struct ip *_pip, struct alias_link *_link);
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void AliasHandlePptpIn(struct ip *_pip, struct alias_link *_link);
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int AliasHandlePptpGreOut(struct ip *_pip);
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int AliasHandlePptpGreIn(struct ip *_pip);
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/* NetBIOS routines */
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int AliasHandleUdpNbt(struct ip *_pip, struct alias_link *_link,
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struct in_addr *_alias_address, u_short _alias_port);
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int AliasHandleUdpNbtNS(struct ip *_pip, struct alias_link *_link,
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struct in_addr *_alias_address, u_short *_alias_port,
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struct in_addr *_original_address, u_short *_original_port);
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/* CUSeeMe routines */
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void AliasHandleCUSeeMeOut(struct ip *_pip, struct alias_link *_link);
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void AliasHandleCUSeeMeIn(struct ip *_pip, struct in_addr _original_addr);
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/* Transparent proxy routines */
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int ProxyCheck(struct ip *_pip, struct in_addr *_proxy_server_addr,
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u_short *_proxy_server_port);
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void ProxyModify(struct alias_link *_link, struct ip *_pip,
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int _maxpacketsize, int _proxy_type);
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enum alias_tcp_state {
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ALIAS_TCP_STATE_NOT_CONNECTED,
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ALIAS_TCP_STATE_CONNECTED,
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ALIAS_TCP_STATE_DISCONNECTED
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};
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/*lint -restore */
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#endif /* !_ALIAS_LOCAL_H_ */
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