diff options
Diffstat (limited to 'lib/libalias/alias_local.h')
| -rw-r--r-- | lib/libalias/alias_local.h | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/lib/libalias/alias_local.h b/lib/libalias/alias_local.h new file mode 100644 index 0000000..67947da --- /dev/null +++ b/lib/libalias/alias_local.h @@ -0,0 +1,355 @@ +/*- + * Copyright (c) 2001 Charles Mott <cm@linktel.net> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Alias_local.h contains the function prototypes for alias.c, + * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well + * as any future add-ons). It also includes macros, globals and + * struct definitions shared by more than one alias*.c file. + * + * This include file is intended to be used only within the aliasing + * software. Outside world interfaces are defined in alias.h + * + * This software is placed into the public domain with no restrictions + * on its distribution. + * + * Initial version: August, 1996 (cjm) + * + * <updated several times by original author and Eivind Eklund> + */ + +#ifndef _ALIAS_LOCAL_H_ +#define _ALIAS_LOCAL_H_ + +#include <sys/queue.h> + +/* Sizes of input and output link tables */ +#define LINK_TABLE_OUT_SIZE 101 +#define LINK_TABLE_IN_SIZE 4001 + +struct proxy_entry; + +struct libalias { + LIST_ENTRY(libalias) instancelist; + + int packetAliasMode; /* Mode flags */ + /* - documented in alias.h */ + + struct in_addr aliasAddress; /* Address written onto source */ + /* field of IP packet. */ + + struct in_addr targetAddress; /* IP address incoming packets */ + /* are sent to if no aliasing */ + /* link already exists */ + + struct in_addr nullAddress; /* Used as a dummy parameter for */ + /* some function calls */ + + LIST_HEAD (, alias_link) linkTableOut[LINK_TABLE_OUT_SIZE]; + /* Lookup table of pointers to */ + /* chains of link records. Each */ + + LIST_HEAD (, alias_link) linkTableIn[LINK_TABLE_IN_SIZE]; + /* link record is doubly indexed */ + /* into input and output lookup */ + /* tables. */ + + /* Link statistics */ + int icmpLinkCount; + int udpLinkCount; + int tcpLinkCount; + int pptpLinkCount; + int protoLinkCount; + int fragmentIdLinkCount; + int fragmentPtrLinkCount; + int sockCount; + + int cleanupIndex; /* Index to chain of link table */ + /* being inspected for old links */ + + int timeStamp; /* System time in seconds for */ + /* current packet */ + + int lastCleanupTime; /* Last time + * IncrementalCleanup() */ + /* was called */ + + int houseKeepingResidual; /* used by HouseKeeping() */ + + int deleteAllLinks; /* If equal to zero, DeleteLink() */ + /* will not remove permanent links */ + + FILE *monitorFile; /* File descriptor for link */ + /* statistics monitoring file */ + + int newDefaultLink; /* Indicates if a new aliasing */ + /* link has been created after a */ + /* call to PacketAliasIn/Out(). */ + +#ifndef NO_FW_PUNCH + int fireWallFD; /* File descriptor to be able to */ + /* control firewall. Opened by */ + /* PacketAliasSetMode on first */ + /* setting the PKT_ALIAS_PUNCH_FW */ + /* flag. */ + int fireWallBaseNum; /* The first firewall entry + * free for our use */ + int fireWallNumNums; /* How many entries can we + * use? */ + int fireWallActiveNum; /* Which entry did we last + * use? */ + char *fireWallField; /* bool array for entries */ +#endif + + unsigned int skinnyPort; /* TCP port used by the Skinny */ + /* protocol. */ + + struct proxy_entry *proxyList; + + struct in_addr true_addr; /* in network byte order. */ + u_short true_port; /* in host byte order. */ + +}; + +/* Macros */ + +/* + * The following macro is used to update an + * internet checksum. "delta" is a 32-bit + * accumulation of all the changes to the + * checksum (adding in new 16-bit words and + * subtracting out old words), and "cksum" + * is the checksum value to be updated. + */ +#define ADJUST_CHECKSUM(acc, cksum) \ + do { \ + acc += cksum; \ + if (acc < 0) { \ + acc = -acc; \ + acc = (acc >> 16) + (acc & 0xffff); \ + acc += acc >> 16; \ + cksum = (u_short) ~acc; \ + } else { \ + acc = (acc >> 16) + (acc & 0xffff); \ + acc += acc >> 16; \ + cksum = (u_short) acc; \ + } \ + } while (0) + + +/* Prototypes */ + +/* General utilities */ +u_short IpChecksum(struct ip *_pip); +u_short TcpChecksum(struct ip *_pip); +void +DifferentialChecksum(u_short * _cksum, void * _new, void * _old, int _n); + +/* Internal data access */ +struct alias_link * +FindIcmpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, + u_short _id_alias, int _create); +struct alias_link * +FindIcmpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, + u_short _id, int _create); +struct alias_link * +FindFragmentIn1(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, + u_short _ip_id); +struct alias_link * +FindFragmentIn2(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, + u_short _ip_id); +struct alias_link * + AddFragmentPtrLink(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id); +struct alias_link * + FindFragmentPtr(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id); +struct alias_link * +FindProtoIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, + u_char _proto); +struct alias_link * +FindProtoOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, + u_char _proto); +struct alias_link * +FindUdpTcpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, + u_short _dst_port, u_short _alias_port, u_char _proto, int _create); +struct alias_link * +FindUdpTcpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, + u_short _src_port, u_short _dst_port, u_char _proto, int _create); +struct alias_link * +AddPptp(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, + struct in_addr _alias_addr, u_int16_t _src_call_id); +struct alias_link * +FindPptpOutByCallId(struct libalias *la, struct in_addr _src_addr, + struct in_addr _dst_addr, u_int16_t _src_call_id); +struct alias_link * +FindPptpInByCallId(struct libalias *la, struct in_addr _dst_addr, + struct in_addr _alias_addr, u_int16_t _dst_call_id); +struct alias_link * +FindPptpOutByPeerCallId(struct libalias *la, struct in_addr _src_addr, + struct in_addr _dst_addr, u_int16_t _dst_call_id); +struct alias_link * +FindPptpInByPeerCallId(struct libalias *la, struct in_addr _dst_addr, + struct in_addr _alias_addr, u_int16_t _alias_call_id); +struct alias_link * +FindRtspOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, + u_short _src_port, u_short _alias_port, u_char _proto); +struct in_addr + FindOriginalAddress(struct libalias *la, struct in_addr _alias_addr); +struct in_addr + FindAliasAddress(struct libalias *la, struct in_addr _original_addr); + +/* External data access/modification */ +int +FindNewPortGroup(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, + u_short _src_port, u_short _dst_port, u_short _port_count, + u_char _proto, u_char _align); +void GetFragmentAddr(struct alias_link *_lnk, struct in_addr *_src_addr); +void SetFragmentAddr(struct alias_link *_lnk, struct in_addr _src_addr); +void GetFragmentPtr(struct alias_link *_lnk, char **_fptr); +void SetFragmentPtr(struct alias_link *_lnk, char *fptr); +void SetStateIn(struct alias_link *_lnk, int _state); +void SetStateOut(struct alias_link *_lnk, int _state); +int GetStateIn (struct alias_link *_lnk); +int GetStateOut(struct alias_link *_lnk); +struct in_addr + GetOriginalAddress(struct alias_link *_lnk); +struct in_addr + GetDestAddress(struct alias_link *_lnk); +struct in_addr + GetAliasAddress(struct alias_link *_lnk); +struct in_addr + GetDefaultAliasAddress(struct libalias *la); +void SetDefaultAliasAddress(struct libalias *la, struct in_addr _alias_addr); +u_short GetOriginalPort(struct alias_link *_lnk); +u_short GetAliasPort(struct alias_link *_lnk); +struct in_addr + GetProxyAddress(struct alias_link *_lnk); +void SetProxyAddress(struct alias_link *_lnk, struct in_addr _addr); +u_short GetProxyPort(struct alias_link *_lnk); +void SetProxyPort(struct alias_link *_lnk, u_short _port); +void SetAckModified(struct alias_link *_lnk); +int GetAckModified(struct alias_link *_lnk); +int GetDeltaAckIn(struct ip *_pip, struct alias_link *_lnk); +int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_lnk); +void AddSeq (struct ip *_pip, struct alias_link *_lnk, int _delta); +void SetExpire (struct alias_link *_lnk, int _expire); +void ClearCheckNewLink(struct libalias *la); +void SetProtocolFlags(struct alias_link *_lnk, int _pflags); +int GetProtocolFlags(struct alias_link *_lnk); +void SetDestCallId(struct alias_link *_lnk, u_int16_t _cid); + +#ifndef NO_FW_PUNCH +void PunchFWHole(struct alias_link *_lnk); + +#endif + +/* Housekeeping function */ +void HouseKeeping(struct libalias *); + +/* Tcp specfic routines */ +/* lint -save -library Suppress flexelint warnings */ + +/* FTP routines */ +void +AliasHandleFtpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, + int _maxpacketsize); + +/* IRC routines */ +void +AliasHandleIrcOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, + int _maxsize); + +/* RTSP routines */ +void +AliasHandleRtspOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, + int _maxpacketsize); + +/* PPTP routines */ +void AliasHandlePptpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); +void AliasHandlePptpIn(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); +int AliasHandlePptpGreOut(struct libalias *la, struct ip *_pip); +int AliasHandlePptpGreIn(struct libalias *la, struct ip *_pip); + +/* NetBIOS routines */ +int +AliasHandleUdpNbt(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, + struct in_addr *_alias_address, u_short _alias_port); +int +AliasHandleUdpNbtNS(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, + struct in_addr *_alias_address, u_short * _alias_port, + struct in_addr *_original_address, u_short * _original_port); + +/* CUSeeMe routines */ +void AliasHandleCUSeeMeOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); +void AliasHandleCUSeeMeIn(struct libalias *la, struct ip *_pip, struct in_addr _original_addr); + +/* Skinny routines */ +void AliasHandleSkinny(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); + +/* Transparent proxy routines */ +int +ProxyCheck(struct libalias *la, struct ip *_pip, struct in_addr *_proxy_server_addr, + u_short * _proxy_server_port); +void +ProxyModify(struct libalias *la, struct alias_link *_lnk, struct ip *_pip, + int _maxpacketsize, int _proxy_type); + +enum alias_tcp_state { + ALIAS_TCP_STATE_NOT_CONNECTED, + ALIAS_TCP_STATE_CONNECTED, + ALIAS_TCP_STATE_DISCONNECTED +}; + +#if defined(_NETINET_IP_H_) +static __inline void * +ip_next(struct ip *iphdr) +{ + char *p = (char *)iphdr; + return (&p[iphdr->ip_hl * 4]); +} +#endif + +#if defined(_NETINET_TCP_H_) +static __inline void * +tcp_next(struct tcphdr *tcphdr) +{ + char *p = (char *)tcphdr; + return (&p[tcphdr->th_off * 4]); +} +#endif + +#if defined(_NETINET_UDP_H_) +static __inline void * +udp_next(struct udphdr *udphdr) +{ + return ((void *)(udphdr + 1)); +} +#endif + +/*lint -restore */ + +#endif /* !_ALIAS_LOCAL_H_ */ |
