7d96f4efd2
- Transparent proxying support added.
- PPTP redirecting support added based on patches
contributed by Dru Nelson <dnelson@redwoodsoft.com>.
Submitted by: Charles Mott <cmott@srv.net>
171 lines
4.7 KiB
C
171 lines
4.7 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 Eiklund>
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*/
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#ifndef ALIAS_LOCAL_H
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#define ALIAS_LOCAL_H
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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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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 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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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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#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 *pip, struct alias_link *link, int maxsize );
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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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int GetPptpAlias (struct in_addr*);
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/*lint -restore */
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#endif /* defined(ALIAS_LOCAL_H) */
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