diff options
Diffstat (limited to 'lib/libalias/alias.h')
| -rw-r--r-- | lib/libalias/alias.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/lib/libalias/alias.h b/lib/libalias/alias.h new file mode 100644 index 0000000..9666b0f --- /dev/null +++ b/lib/libalias/alias.h @@ -0,0 +1,166 @@ +/*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. + + $FreeBSD$ +*/ + + +#ifndef _ALIAS_H_ +#define _ALIAS_H_ + +#ifndef NULL +#define NULL 0 +#endif + +/* Alias link representative (incomplete struct) */ +struct alias_link; + +/* External interfaces (API) to packet aliasing engine */ + +/* Initialization and Control */ + extern void + PacketAliasInit(void); + + extern void + PacketAliasUninit(void); + + extern void + PacketAliasSetAddress(struct in_addr); + + extern unsigned int + PacketAliasSetMode(unsigned int, unsigned int); + +#ifndef NO_FW_PUNCH + extern void + PacketAliasSetFWBase(unsigned int, unsigned int); +#endif + +/* Packet Handling */ + extern int + PacketAliasIn(char *, int maxpacketsize); + + extern int + PacketAliasOut(char *, int maxpacketsize); + +/* 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 + PacketAliasPptp(struct in_addr); + + + 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 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 SetPacketAliasMode() */ + +/* 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 eg 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 with + unregistered source addresses will be aliased (along with those + of the ppp host maching itself. 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 functions 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 0x40 +#endif + +/* 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 + +/* 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 +/*lint -restore */ |
