2 * Copyright (c) 2001 Charles Mott <cm@linktel.net>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/lib/libalias/alias_local.h,v 1.10.2.7 2001/11/23 13:10:15 brian Exp $
30 * Alias_local.h contains the function prototypes for alias.c,
31 * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
32 * as any future add-ons). It also includes macros, globals and
33 * struct definitions shared by more than one alias*.c file.
35 * This include file is intended to be used only within the aliasing
36 * software. Outside world interfaces are defined in alias.h
38 * This software is placed into the public domain with no restrictions
39 * on its distribution.
41 * Initial version: August, 1996 (cjm)
43 * <updated several times by original author and Eivind Eklund>
46 #ifndef _ALIAS_LOCAL_H_
47 #define _ALIAS_LOCAL_H_
52 * The following macro is used to update an
53 * internet checksum. "delta" is a 32-bit
54 * accumulation of all the changes to the
55 * checksum (adding in new 16-bit words and
56 * subtracting out old words), and "cksum"
57 * is the checksum value to be updated.
59 #define ADJUST_CHECKSUM(acc, cksum) \
64 acc = (acc >> 16) + (acc & 0xffff); \
66 cksum = (u_short) ~acc; \
68 acc = (acc >> 16) + (acc & 0xffff); \
70 cksum = (u_short) acc; \
76 extern int packetAliasMode;
80 /* General utilities */
81 u_short IpChecksum(struct ip *_pip);
82 u_short TcpChecksum(struct ip *_pip);
83 void DifferentialChecksum(u_short *_cksum, u_short *_new, u_short *_old,
86 /* Internal data access */
88 FindIcmpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
89 u_short _id_alias, int _create);
91 FindIcmpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
92 u_short _id, int _create);
94 FindFragmentIn1(struct in_addr _dst_addr, struct in_addr _alias_addr,
97 FindFragmentIn2(struct in_addr _dst_addr, struct in_addr _alias_addr,
100 AddFragmentPtrLink(struct in_addr _dst_addr, u_short _ip_id);
102 FindFragmentPtr(struct in_addr _dst_addr, u_short _ip_id);
104 FindProtoIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
107 FindProtoOut(struct in_addr _src_addr, struct in_addr _dst_addr,
110 FindUdpTcpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
111 u_short _dst_port, u_short _alias_port, u_char _proto, int _create);
113 FindUdpTcpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
114 u_short _src_port, u_short _dst_port, u_char _proto, int _create);
116 AddPptp(struct in_addr _src_addr, struct in_addr _dst_addr,
117 struct in_addr _alias_addr, u_int16_t _src_call_id);
119 FindPptpOutByCallId(struct in_addr _src_addr,
120 struct in_addr _dst_addr, u_int16_t _src_call_id);
122 FindPptpInByCallId(struct in_addr _dst_addr,
123 struct in_addr _alias_addr, u_int16_t _dst_call_id);
125 FindPptpOutByPeerCallId(struct in_addr _src_addr,
126 struct in_addr _dst_addr, u_int16_t _dst_call_id);
128 FindPptpInByPeerCallId(struct in_addr _dst_addr,
129 struct in_addr _alias_addr, u_int16_t _alias_call_id);
131 FindRtspOut(struct in_addr _src_addr, struct in_addr _dst_addr,
132 u_short _src_port, u_short _alias_port, u_char _proto);
134 FindOriginalAddress(struct in_addr _alias_addr);
136 FindAliasAddress(struct in_addr _original_addr);
138 /* External data access/modification */
139 int FindNewPortGroup(struct in_addr _dst_addr, struct in_addr _alias_addr,
140 u_short _src_port, u_short _dst_port, u_short _port_count,
141 u_char _proto, u_char _align);
142 void GetFragmentAddr(struct alias_link *_link, struct in_addr *_src_addr);
143 void SetFragmentAddr(struct alias_link *_link, struct in_addr _src_addr);
144 void GetFragmentPtr(struct alias_link *_link, char **_fptr);
145 void SetFragmentPtr(struct alias_link *_link, char *fptr);
146 void SetStateIn(struct alias_link *_link, int _state);
147 void SetStateOut(struct alias_link *_link, int _state);
148 int GetStateIn(struct alias_link *_link);
149 int GetStateOut(struct alias_link *_link);
151 GetOriginalAddress(struct alias_link *_link);
153 GetDestAddress(struct alias_link *_link);
155 GetAliasAddress(struct alias_link *_link);
157 GetDefaultAliasAddress(void);
158 void SetDefaultAliasAddress(struct in_addr _alias_addr);
159 u_short GetOriginalPort(struct alias_link *_link);
160 u_short GetAliasPort(struct alias_link *_link);
162 GetProxyAddress(struct alias_link *_link);
163 void SetProxyAddress(struct alias_link *_link, struct in_addr _addr);
164 u_short GetProxyPort(struct alias_link *_link);
165 void SetProxyPort(struct alias_link *_link, u_short _port);
166 void SetAckModified(struct alias_link *_link);
167 int GetAckModified(struct alias_link *_link);
168 int GetDeltaAckIn(struct ip *_pip, struct alias_link *_link);
169 int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_link);
170 void AddSeq(struct ip *_pip, struct alias_link *_link, int _delta);
171 void SetExpire(struct alias_link *_link, int _expire);
172 void ClearCheckNewLink(void);
173 void SetLastLineCrlfTermed(struct alias_link *_link, int _yes);
174 int GetLastLineCrlfTermed(struct alias_link *_link);
175 void SetDestCallId(struct alias_link *_link, u_int16_t _cid);
177 void PunchFWHole(struct alias_link *_link);
180 /* Housekeeping function */
181 void HouseKeeping(void);
183 /* Tcp specfic routines */
184 /* lint -save -library Suppress flexelint warnings */
187 void AliasHandleFtpOut(struct ip *_pip, struct alias_link *_link,
191 void AliasHandleIrcOut(struct ip *_pip, struct alias_link *_link,
195 void AliasHandleRtspOut(struct ip *_pip, struct alias_link *_link,
199 void AliasHandlePptpOut(struct ip *_pip, struct alias_link *_link);
200 void AliasHandlePptpIn(struct ip *_pip, struct alias_link *_link);
201 int AliasHandlePptpGreOut(struct ip *_pip);
202 int AliasHandlePptpGreIn(struct ip *_pip);
204 /* NetBIOS routines */
205 int AliasHandleUdpNbt(struct ip *_pip, struct alias_link *_link,
206 struct in_addr *_alias_address, u_short _alias_port);
207 int AliasHandleUdpNbtNS(struct ip *_pip, struct alias_link *_link,
208 struct in_addr *_alias_address, u_short *_alias_port,
209 struct in_addr *_original_address, u_short *_original_port);
211 /* CUSeeMe routines */
212 void AliasHandleCUSeeMeOut(struct ip *_pip, struct alias_link *_link);
213 void AliasHandleCUSeeMeIn(struct ip *_pip, struct in_addr _original_addr);
215 /* Transparent proxy routines */
216 int ProxyCheck(struct ip *_pip, struct in_addr *_proxy_server_addr,
217 u_short *_proxy_server_port);
218 void ProxyModify(struct alias_link *_link, struct ip *_pip,
219 int _maxpacketsize, int _proxy_type);
221 enum alias_tcp_state {
222 ALIAS_TCP_STATE_NOT_CONNECTED,
223 ALIAS_TCP_STATE_CONNECTED,
224 ALIAS_TCP_STATE_DISCONNECTED
229 #endif /* !_ALIAS_LOCAL_H_ */