diff options
Diffstat (limited to 'lib/libalias/alias.h')
| -rw-r--r-- | lib/libalias/alias.h | 287 |
1 files changed, 137 insertions, 150 deletions
diff --git a/lib/libalias/alias.h b/lib/libalias/alias.h index 7e18edb..607021f 100644 --- a/lib/libalias/alias.h +++ b/lib/libalias/alias.h @@ -1,169 +1,156 @@ -/*lint -save -library Flexelint comment for external headers */ +/* lint -save -library Flexelint comment for external headers */ + +/*- + * Alias.h defines the outside world interfaces for the packet aliasing + * software. + * + * This software is placed into the public domain with no restrictions on its + * distribution. + * + * $FreeBSD$ + */ -/* - Alias.h defines the outside world interfaces for the packet - aliasing software. +#ifndef _ALIAS_H_ +#define _ALIAS_H_ - This software is placed into the public domain with no restrictions - on its distribution. +/* The external interface to libalias, the packet aliasing engine. */ - $FreeBSD$ -*/ +/* Initialization and control functions. */ +void PacketAliasInit(void); +void PacketAliasSetAddress(struct in_addr _addr); +void PacketAliasSetFWBase(unsigned int _base, unsigned int _num); +unsigned int + PacketAliasSetMode(unsigned int _flags, unsigned int _mask); +void PacketAliasUninit(void); +/* Packet Handling functions. */ +int PacketAliasIn(char *_ptr, int _maxpacketsize); +int PacketAliasOut(char *_ptr, int _maxpacketsize); +int PacketUnaliasOut(char *_ptr, int _maxpacketsize); -#ifndef _ALIAS_H_ -#define _ALIAS_H_ +/* Port and address redirection functions. */ -/* Alias link representative (incomplete struct) */ -struct alias_link; +/* + * An anonymous structure, a pointer to which is returned from + * PacketAliasRedirectAddr(), PacketAliasRedirectPort() or + * PacketAliasRedirectProto(), passed to PacketAliasAddServer(), + * and freed by PacketAliasRedirectDelete(). + */ +struct alias_link; + +int PacketAliasAddServer(struct alias_link *_link, + struct in_addr _addr, unsigned short _port); +struct alias_link * + PacketAliasRedirectAddr(struct in_addr _src_addr, + struct in_addr _alias_addr); +void PacketAliasRedirectDelete(struct alias_link *_link); +struct alias_link * + PacketAliasRedirectPort(struct in_addr _src_addr, + unsigned short _src_port, struct in_addr _dst_addr, + unsigned short _dst_port, struct in_addr _alias_addr, + unsigned short _alias_port, unsigned char _proto); +struct alias_link * + PacketAliasRedirectProto(struct in_addr _src_addr, + struct in_addr _dst_addr, struct in_addr _alias_addr, + unsigned char _proto); + +/* Fragment Handling functions. */ +void PacketAliasFragmentIn(char *_ptr, char *_ptr_fragment); +char *PacketAliasGetFragment(char *_ptr); +int PacketAliasSaveFragment(char *_ptr); + +/* Miscellaneous functions. */ +int PacketAliasCheckNewLink(void); +unsigned short + PacketAliasInternetChecksum(unsigned short *_ptr, int _nbytes); +void PacketAliasSetTarget(struct in_addr _target_addr); + +/* Transparent proxying routines. */ +int PacketAliasProxyRule(const char *_cmd); + +/* Mode flags, set using PacketAliasSetMode() */ -/* External interfaces (API) to packet aliasing engine */ +/* + * If PKT_ALIAS_LOG is set, a message will be printed to /var/log/alias.log + * every time a link is created or deleted. This is useful for debugging. + */ +#define PKT_ALIAS_LOG 0x01 -/* Initialization and Control */ - extern void - PacketAliasInit(void); +/* + * If PKT_ALIAS_DENY_INCOMING is set, then incoming connections (e.g. to ftp, + * telnet or web servers will be prevented by the aliasing mechanism. + */ +#define PKT_ALIAS_DENY_INCOMING 0x02 - extern void - PacketAliasUninit(void); +/* + * If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from the + * same port as they originated on. This allows e.g. rsh to work *99% of the + * time*, but _not_ 100% (it will be slightly flakey instead of not working + * at all). This mode bit is set by PacketAliasInit(), so it is a default + * mode of operation. + */ +#define PKT_ALIAS_SAME_PORTS 0x04 - extern void - PacketAliasSetAddress(struct in_addr); +/* + * If PKT_ALIAS_USE_SOCKETS is set, then when partially specified links (e.g. + * destination port and/or address is zero), the packet aliasing engine will + * attempt to allocate a socket for the aliasing port it chooses. This will + * avoid interference with the host machine. Fully specified links do not + * require this. This bit is set after a call to PacketAliasInit(), so it is + * a default mode of operation. + */ +#define PKT_ALIAS_USE_SOCKETS 0x08 + +/*- + * If PKT_ALIAS_UNREGISTERED_ONLY is set, then only packets with + * unregistered source addresses will be aliased. Private + * addresses are those in the following ranges: + * + * 10.0.0.0 -> 10.255.255.255 + * 172.16.0.0 -> 172.31.255.255 + * 192.168.0.0 -> 192.168.255.255 + */ +#define PKT_ALIAS_UNREGISTERED_ONLY 0x10 - extern unsigned int - PacketAliasSetMode(unsigned int, unsigned int); +/* + * If PKT_ALIAS_RESET_ON_ADDR_CHANGE is set, then the table of dynamic + * aliasing links will be reset whenever PacketAliasSetAddress() changes the + * default aliasing address. If the default aliasing address is left + * unchanged by this function call, then the table of dynamic aliasing links + * will be left intact. This bit is set after a call to PacketAliasInit(). + */ +#define PKT_ALIAS_RESET_ON_ADDR_CHANGE 0x20 #ifndef NO_FW_PUNCH - extern void - PacketAliasSetFWBase(unsigned int, unsigned int); +/* + * If PKT_ALIAS_PUNCH_FW is set, active FTP and IRC DCC connections will + * create a 'hole' in the firewall to allow the transfers to work. The + * ipfw rule number that the hole is created with is controlled by + * PacketAliasSetFWBase(). The hole will be attached to that + * particular alias_link, so when the link goes away the hole is deleted. + */ +#define PKT_ALIAS_PUNCH_FW 0x100 #endif -/* Packet Handling */ - extern int - PacketAliasIn(char *, int); - - extern int - PacketAliasOut(char *, int); - - extern int - PacketUnaliasOut(char *, int); - -/* Port and Address Redirection */ - extern struct alias_link * - PacketAliasRedirectPort(struct in_addr, u_short, - struct in_addr, u_short, - struct in_addr, u_short, - u_char); - - extern int - PacketAliasAddServer(struct alias_link *, struct in_addr, u_short); - - extern struct alias_link * - PacketAliasRedirectProto(struct in_addr, - struct in_addr, - struct in_addr, - u_char); - - extern struct alias_link * - PacketAliasRedirectAddr(struct in_addr, - struct in_addr); - - extern void - PacketAliasRedirectDelete(struct alias_link *); - -/* Fragment Handling */ - extern int - PacketAliasSaveFragment(char *); - - extern char * - PacketAliasGetFragment(char *); - - extern void - PacketAliasFragmentIn(char *, char *); - -/* Miscellaneous Functions */ - extern void - PacketAliasSetTarget(struct in_addr); - - extern int - PacketAliasCheckNewLink(void); - - extern u_short - PacketAliasInternetChecksum(u_short *, int); - -/* Transparent Proxying */ - extern int - PacketAliasProxyRule(const char *); - - -/********************** Mode flags ********************/ -/* Set these flags using PacketAliasSetMode() */ - -/* If PKT_ALIAS_LOG is set, a message will be printed to - /var/log/alias.log every time a link is created or deleted. This - is useful for debugging */ -#define PKT_ALIAS_LOG 0x01 - -/* If PKT_ALIAS_DENY_INCOMING is set, then incoming connections (e.g. - to ftp, telnet or web servers will be prevented by the aliasing - mechanism. */ -#define PKT_ALIAS_DENY_INCOMING 0x02 - -/* If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from - the same port as they originated on. This allows e.g. rsh to work - *99% of the time*, but _not_ 100%. (It will be slightly flakey - instead of not working at all.) This mode bit is set by - PacketAliasInit(), so it is a default mode of operation. */ -#define PKT_ALIAS_SAME_PORTS 0x04 - -/* If PKT_ALIAS_USE_SOCKETS is set, then when partially specified - links (e.g. destination port and/or address is zero), the packet - aliasing engine will attempt to allocate a socket for the aliasing - port it chooses. This will avoid interference with the host - machine. Fully specified links do not require this. This bit - is set after a call to PacketAliasInit(), so it is a default - mode of operation. */ -#define PKT_ALIAS_USE_SOCKETS 0x08 - -/* If PKT_ALIAS_UNREGISTERED_ONLY is set, then only packets with - unregistered source addresses will be aliased. Private - addresses are those in the following ranges: - 10.0.0.0 -> 10.255.255.255 - 172.16.0.0 -> 172.31.255.255 - 192.168.0.0 -> 192.168.255.255 */ -#define PKT_ALIAS_UNREGISTERED_ONLY 0x10 - -/* If PKT_ALIAS_RESET_ON_ADDR_CHANGE is set, then the table of dynamic - aliasing links will be reset whenever PacketAliasSetAddress() - changes the default aliasing address. If the default aliasing - address is left unchanged by this function call, then the - table of dynamic aliasing links will be left intact. This - bit is set after a call to PacketAliasInit(). */ -#define PKT_ALIAS_RESET_ON_ADDR_CHANGE 0x20 - -#ifndef NO_FW_PUNCH -/* If PKT_ALIAS_PUNCH_FW is set, active FTP and IRC DCC connections - will create a 'hole' in the firewall to allow the transfers to - work. Where (IPFW "line-numbers") the hole is created is - controlled by PacketAliasSetFWBase(base, size). The hole will be - attached to that particular alias_link, so when the link goes away - so do the hole. */ -#define PKT_ALIAS_PUNCH_FW 0x100 -#endif +/* + * If PKT_ALIAS_PROXY_ONLY is set, then NAT will be disabled and only + * transparent proxying is performed. + */ +#define PKT_ALIAS_PROXY_ONLY 0x40 -/* If PKT_ALIAS_PROXY_ONLY is set, then NAT will be disabled and only - transparent proxying performed */ -#define PKT_ALIAS_PROXY_ONLY 0x40 +/* + * If PKT_ALIAS_REVERSE is set, the actions of PacketAliasIn() and + * PacketAliasOut() are reversed. + */ +#define PKT_ALIAS_REVERSE 0x80 -/* If PKT_ALIAS_REVERSE is set, the actions of PacketAliasIn() - and PacketAliasOut() are reversed */ -#define PKT_ALIAS_REVERSE 0x80 +/* Function return codes. */ +#define PKT_ALIAS_ERROR -1 +#define PKT_ALIAS_OK 1 +#define PKT_ALIAS_IGNORED 2 +#define PKT_ALIAS_UNRESOLVED_FRAGMENT 3 +#define PKT_ALIAS_FOUND_HEADER_FRAGMENT 4 -/* Return Codes */ -#define PKT_ALIAS_ERROR -1 -#define PKT_ALIAS_OK 1 -#define PKT_ALIAS_IGNORED 2 -#define PKT_ALIAS_UNRESOLVED_FRAGMENT 3 -#define PKT_ALIAS_FOUND_HEADER_FRAGMENT 4 +#endif /* !_ALIAS_H_ */ -#endif -/*lint -restore */ +/* lint -restore */ |
