3b160b8b6e
ppp (or will be shortly). Natd can now be updated to use this library rather than carrying its own version of the code. Submitted by: Charles Mott <cmott@srv.net>
103 lines
3.5 KiB
C
103 lines
3.5 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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*/
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#ifndef _ALIAS_H_
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#define _ALIAS_H_
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/* Alias link representativei (incomplete struct) */
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struct alias_link;
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/* External interfaces (API) to packet aliasing engine */
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extern int SaveFragmentPtr(char *);
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extern char *GetNextFragmentPtr(char *);
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extern void FragmentAliasIn(char *, char *);
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extern int PacketAliasIn(char *, int maxpacketsize);
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extern int PacketAliasOut(char *, int maxpacketsize);
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extern int PacketAliasIn2(char *, struct in_addr, int maxpacketsize);
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extern int PacketAliasOut2(char *, struct in_addr, int maxpacketsize);
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extern void SetPacketAliasAddress(struct in_addr);
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extern void InitPacketAlias(void);
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extern void InitPacketAliasLog(void);
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extern void UninitPacketAliasLog(void);
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extern unsigned int SetPacketAliasMode(unsigned int, unsigned int);
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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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PacketAliasPermanentLink(struct in_addr, u_short,
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struct in_addr, u_short,
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u_short, u_char);
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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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void PacketAliasRedirectDelete(struct alias_link *);
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/* InternetChecksum() is not specifically part of the
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packet aliasing API, but is sometimes needed outside
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the module. (~for instance, natd uses it to create
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an ICMP error message when interface size is
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exceeded.) */
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extern u_short InternetChecksum(u_short *, int);
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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 1
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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 2
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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 allow 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.) */
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#define PKT_ALIAS_SAME_PORTS 4
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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. */
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#define PKT_ALIAS_USE_SOCKETS 8
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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 16
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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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#define PKT_ALIAS_NEW_LINK 5
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#endif
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/*lint -restore */
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