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03453c5e87
PPTP links are no longer dropped by simple (and inappropriate in this case) "inactivity timeout" procedure, only when requested through the control connection. It is now possible to have multiple PPTP servers running behind NAT. Just redirect the incoming TCP traffic to port 1723, everything else is done transparently. Problems were reported and the fix was tested by: Michael Adler <Michael.Adler@compaq.com>, David Andersen <dga@lcs.mit.edu>
218 lines
6.1 KiB
C
218 lines
6.1 KiB
C
/* -*- mode: c; tab-width: 3; c-basic-offset: 3; -*-
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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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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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This software is placed into the public domain with no restrictions
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on its distribution.
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Initial version: August, 1996 (cjm)
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<updated several times by original author and Eivind Eklund>
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$FreeBSD$
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*/
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#ifndef ALIAS_LOCAL_H
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#define ALIAS_LOCAL_H
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#ifndef NULL
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#define NULL 0
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#endif
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/*
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Macros
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*/
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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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acc += cksum; \
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if (acc < 0) \
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{ \
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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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} \
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else \
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{ \
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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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}
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/*
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Globals
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*/
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extern int packetAliasMode;
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/*
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Structs
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*/
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struct alias_link; /* Incomplete structure */
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/*
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Prototypes
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*/
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/* General utilities */
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u_short IpChecksum(struct ip *);
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u_short TcpChecksum(struct ip *);
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void DifferentialChecksum(u_short *, u_short *, u_short *, int);
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/* Internal data access */
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struct alias_link *
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FindIcmpIn(struct in_addr, struct in_addr, u_short);
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struct alias_link *
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FindIcmpOut(struct in_addr, struct in_addr, u_short);
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struct alias_link *
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FindFragmentIn1(struct in_addr, struct in_addr, u_short);
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struct alias_link *
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FindFragmentIn2(struct in_addr, struct in_addr, u_short);
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struct alias_link *
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AddFragmentPtrLink(struct in_addr, u_short);
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struct alias_link *
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FindFragmentPtr(struct in_addr, u_short);
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struct alias_link *
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FindProtoIn(struct in_addr, struct in_addr, u_char);
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struct alias_link *
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FindProtoOut(struct in_addr, struct in_addr, u_char);
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struct alias_link *
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FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
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struct alias_link *
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FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
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struct alias_link *
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AddPptp(struct in_addr, struct in_addr, struct in_addr, u_int16_t);
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struct alias_link *
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FindPptpOutByCallId(struct in_addr, struct in_addr, u_int16_t);
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struct alias_link *
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FindPptpInByCallId(struct in_addr, struct in_addr, u_int16_t);
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struct alias_link *
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FindPptpOutByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
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struct alias_link *
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FindPptpInByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
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struct alias_link *
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QueryUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
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struct alias_link *
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QueryUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
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struct alias_link *
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FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
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struct in_addr
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FindOriginalAddress(struct in_addr);
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struct in_addr
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FindAliasAddress(struct in_addr);
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/* External data access/modification */
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int FindNewPortGroup(struct in_addr, struct in_addr,
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u_short, u_short, u_short, u_char, u_char);
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void GetFragmentAddr(struct alias_link *, struct in_addr *);
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void SetFragmentAddr(struct alias_link *, struct in_addr);
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void GetFragmentPtr(struct alias_link *, char **);
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void SetFragmentPtr(struct alias_link *, char *);
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void SetStateIn(struct alias_link *, int);
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void SetStateOut(struct alias_link *, int);
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int GetStateIn(struct alias_link *);
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int GetStateOut(struct alias_link *);
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struct in_addr GetOriginalAddress(struct alias_link *);
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struct in_addr GetDestAddress(struct alias_link *);
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struct in_addr GetAliasAddress(struct alias_link *);
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struct in_addr GetDefaultAliasAddress(void);
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void SetDefaultAliasAddress(struct in_addr);
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u_short GetOriginalPort(struct alias_link *);
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u_short GetAliasPort(struct alias_link *);
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struct in_addr GetProxyAddress(struct alias_link *);
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void SetProxyAddress(struct alias_link *, struct in_addr);
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u_short GetProxyPort(struct alias_link *);
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void SetProxyPort(struct alias_link *, u_short);
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void SetAckModified(struct alias_link *);
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int GetAckModified(struct alias_link *);
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int GetDeltaAckIn(struct ip *, struct alias_link *);
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int GetDeltaSeqOut(struct ip *, struct alias_link *);
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void AddSeq(struct ip *, struct alias_link *, int);
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void SetExpire(struct alias_link *, int);
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void ClearCheckNewLink(void);
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void SetLastLineCrlfTermed(struct alias_link *, int);
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int GetLastLineCrlfTermed(struct alias_link *);
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void SetDestCallId(struct alias_link *, u_int16_t);
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#ifndef NO_FW_PUNCH
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void PunchFWHole(struct alias_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 *, struct alias_link *, int);
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/* IRC routines */
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void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
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/* RTSP routines */
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void AliasHandleRtspOut(struct ip *, struct alias_link *, int);
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/* PPTP routines */
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void AliasHandlePptpOut(struct ip *, struct alias_link *);
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void AliasHandlePptpIn(struct ip *, struct alias_link *);
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int AliasHandlePptpGreOut(struct ip *);
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int AliasHandlePptpGreIn(struct ip *);
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/* NetBIOS routines */
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int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
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int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
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/* CUSeeMe routines */
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void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
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void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
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/* Transparent proxy routines */
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int ProxyCheck(struct ip *, struct in_addr *, u_short *);
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void ProxyModify(struct alias_link *, struct ip *, int, int);
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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 /* defined(ALIAS_LOCAL_H) */
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