diff options
Diffstat (limited to 'lib/libalias/alias.h')
| -rw-r--r-- | lib/libalias/alias.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/lib/libalias/alias.h b/lib/libalias/alias.h new file mode 100644 index 0000000..0063802 --- /dev/null +++ b/lib/libalias/alias.h @@ -0,0 +1,102 @@ +/*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. +*/ + + +#ifndef _ALIAS_H_ +#define _ALIAS_H_ + +/* Alias link representativei (incomplete struct) */ +struct alias_link; + +/* External interfaces (API) to packet aliasing engine */ +extern int SaveFragmentPtr(char *); +extern char *GetNextFragmentPtr(char *); +extern void FragmentAliasIn(char *, char *); +extern int PacketAliasIn(char *, int maxpacketsize); +extern int PacketAliasOut(char *, int maxpacketsize); +extern int PacketAliasIn2(char *, struct in_addr, int maxpacketsize); +extern int PacketAliasOut2(char *, struct in_addr, int maxpacketsize); +extern void SetPacketAliasAddress(struct in_addr); +extern void InitPacketAlias(void); +extern void InitPacketAliasLog(void); +extern void UninitPacketAliasLog(void); +extern unsigned int SetPacketAliasMode(unsigned int, unsigned int); +extern struct alias_link * +PacketAliasRedirectPort(struct in_addr, u_short, + struct in_addr, u_short, + struct in_addr, u_short, + u_char); +extern int +PacketAliasPermanentLink(struct in_addr, u_short, + struct in_addr, u_short, + u_short, u_char); +extern struct alias_link * +PacketAliasRedirectAddr(struct in_addr, + struct in_addr); +void PacketAliasRedirectDelete(struct alias_link *); + + +/* InternetChecksum() is not specifically part of the + packet aliasing API, but is sometimes needed outside + the module. (~for instance, natd uses it to create + an ICMP error message when interface size is + exceeded.) */ + +extern u_short InternetChecksum(u_short *, int); + + +/********************** 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 1 + +/* 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 2 + +/* If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from + the same port as they originated on. This allow eg rsh to work + *99% of the time*, but _not_ 100%. (It will be slightly flakey + instead of not working at all.) */ +#define PKT_ALIAS_SAME_PORTS 4 + +/* 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. */ +#define PKT_ALIAS_USE_SOCKETS 8 + +/* 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 16 + + + +/* 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 +#define PKT_ALIAS_NEW_LINK 5 + +#endif +/*lint -restore */ |
