087590fb63
- 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>
167 lines
4.9 KiB
C
167 lines
4.9 KiB
C
/*lint -save -library Flexelint comment for external headers */
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/*
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Alias.h defines the outside world interfaces for the packet
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aliasing software.
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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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$Id: alias.h,v 1.8 1998/04/19 21:42:05 brian Exp $
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*/
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#ifndef _ALIAS_H_
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#define _ALIAS_H_
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#ifndef NULL
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#define NULL 0
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#endif
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/* Alias link representative (incomplete struct) */
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struct alias_link;
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/* External interfaces (API) to packet aliasing engine */
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/* Initialization and Control */
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extern void
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PacketAliasInit(void);
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extern void
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PacketAliasUninit(void);
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extern void
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PacketAliasSetAddress(struct in_addr);
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extern unsigned int
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PacketAliasSetMode(unsigned int, unsigned int);
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#ifndef NO_FW_PUNCH
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extern void
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PacketAliasSetFWBase(unsigned int, unsigned int);
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#endif
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/* Packet Handling */
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extern int
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PacketAliasIn(char *, int maxpacketsize);
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extern int
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PacketAliasOut(char *, int maxpacketsize);
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/* Port and Address Redirection */
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extern struct alias_link *
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PacketAliasRedirectPort(struct in_addr, u_short,
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struct in_addr, u_short,
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struct in_addr, u_short,
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u_char);
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extern int
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PacketAliasPptp(struct in_addr);
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extern struct alias_link *
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PacketAliasRedirectAddr(struct in_addr,
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struct in_addr);
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extern void
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PacketAliasRedirectDelete(struct alias_link *);
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/* Fragment Handling */
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extern int
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PacketAliasSaveFragment(char *);
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extern char *
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PacketAliasGetFragment(char *);
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extern void
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PacketAliasFragmentIn(char *, char *);
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/* Miscellaneous Functions */
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extern void
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PacketAliasSetTarget(struct in_addr addr);
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extern int
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PacketAliasCheckNewLink(void);
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extern u_short
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PacketAliasInternetChecksum(u_short *, int);
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/* Transparent Proxying */
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extern int
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PacketAliasProxyRule(char *);
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/********************** Mode flags ********************/
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/* Set these flags using SetPacketAliasMode() */
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/* If PKT_ALIAS_LOG is set, a message will be printed to
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/var/log/alias.log every time a link is created or deleted. This
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is useful for debugging */
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#define PKT_ALIAS_LOG 0x01
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/* If PKT_ALIAS_DENY_INCOMING is set, then incoming connections (e.g.
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to ftp, telnet or web servers will be prevented by the aliasing
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mechanism. */
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#define PKT_ALIAS_DENY_INCOMING 0x02
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/* If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from
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the same port as they originated on. This allows eg rsh to work
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*99% of the time*, but _not_ 100%. (It will be slightly flakey
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instead of not working at all.) This mode bit is set by
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PacketAliasInit(), so it is a default mode of operation. */
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#define PKT_ALIAS_SAME_PORTS 0x04
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/* If PKT_ALIAS_USE_SOCKETS is set, then when partially specified
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links (e.g. destination port and/or address is zero), the packet
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aliasing engine will attempt to allocate a socket for the aliasing
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port it chooses. This will avoid interference with the host
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machine. Fully specified links do not require this. This bit
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is set after a call to PacketAliasInit(), so it is a default
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mode of operation.*/
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#define PKT_ALIAS_USE_SOCKETS 0x08
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/* If PKT_ALIAS_UNREGISTERED_ONLY is set, then only packets with with
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unregistered source addresses will be aliased (along with those
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of the ppp host maching itself. Private addresses are those
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in the following ranges:
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10.0.0.0 -> 10.255.255.255
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172.16.0.0 -> 172.31.255.255
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192.168.0.0 -> 192.168.255.255 */
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#define PKT_ALIAS_UNREGISTERED_ONLY 0x10
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/* If PKT_ALIAS_RESET_ON_ADDR_CHANGE is set, then the table of dynamic
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aliasing links will be reset whenever PacketAliasSetAddress()
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changes the default aliasing address. If the default aliasing
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address is left unchanged by this functions call, then the
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table of dynamic aliasing links will be left intact. This
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bit is set after a call to PacketAliasInit(). */
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#define PKT_ALIAS_RESET_ON_ADDR_CHANGE 0x20
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#ifndef NO_FW_PUNCH
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/* If PKT_ALIAS_PUNCH_FW is set, active FTP and IRC DCC connections
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will create a 'hole' in the firewall to allow the transfers to
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work. Where (IPFW "line-numbers") the hole is created is
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controlled by PacketAliasSetFWBase(base, size). The hole will be
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attached to that particular alias_link, so when the link goes away
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so do the hole. */
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#define PKT_ALIAS_PUNCH_FW 0x40
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#endif
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/* If PKT_ALIAS_PROXY_ONLY is set, then NAT will be disabled and only
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transparent proxying performed */
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#define PKT_ALIAS_PROXY_ONLY 0x40
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/* If PKT_ALIAS_REVERSE is set, the actions of PacketAliasIn()
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and PacketAliasOut() are reversed */
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#define PKT_ALIAS_REVERSE 0x80
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/* Return Codes */
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#define PKT_ALIAS_ERROR -1
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#define PKT_ALIAS_OK 1
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#define PKT_ALIAS_IGNORED 2
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#define PKT_ALIAS_UNRESOLVED_FRAGMENT 3
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#define PKT_ALIAS_FOUND_HEADER_FRAGMENT 4
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#endif
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/*lint -restore */
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