alias/alias_local.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*-
  23  * Copyright (c) 2001 Charles Mott <cmott@scientech.com>
  24  * All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  36  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  38  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  39  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  40  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  41  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  42  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  43  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  44  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  45  * SUCH DAMAGE.
  46  *
  47  * Based upon:
  48  * $FreeBSD: src/lib/libalias/alias_local.h,v 1.10.2.5 2001/08/01 09:52:26 obrien Exp $
  49  */
  50
  51 /*
  52  * Alias_local.h contains the function prototypes for alias.c,
  53  * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
  54  * as any future add-ons).  It also includes macros, globals and
  55  * struct definitions shared by more than one alias*.c file.
  56  *
  57  * This include file is intended to be used only within the aliasing
  58  * software.  Outside world interfaces are defined in alias.h
  59  *
  60  * This software is placed into the public domain with no restrictions
  61  * on its distribution.
  62  *
  63  * Initial version:  August, 1996  (cjm)
  64  *
  65  * <updated several times by original author and Eivind Eklund>
  66  */
  67
  68 #ifndef _ALIAS_LOCAL_H_
  69 #define _ALIAS_LOCAL_H_
  70
  71 #ifndef NULL
  72 #define NULL 0
  73 #endif
  74
  75 /* Macros */
  76
  77 /*
  78  * The following macro is used to update an
  79  * internet checksum.  "delta" is a 32-bit
  80  * accumulation of all the changes to the
  81  * checksum (adding in new 16-bit words and
  82  * subtracting out old words), and "cksum"
  83  * is the checksum value to be updated.
  84  */
  85 #define ADJUST_CHECKSUM(acc, cksum) \
  86         do { \
  87                 acc += cksum; \
  88                 if (acc < 0) { \
  89                         acc = -acc; \
  90                         acc = (acc >> 16) + (acc & 0xffff); \
  91                         acc += acc >> 16; \
  92                         cksum = (u_short) ~acc; \
  93                 } else { \
  94                         acc = (acc >> 16) + (acc & 0xffff); \
  95                         acc += acc >> 16; \
  96                         cksum = (u_short) acc; \
  97                 } \
  98         } while (0)
  99
 100 /* Globals */
 101
 102 extern int packetAliasMode;
 103
 104
 105 /* Structs */
 106
 107 struct alias_link;    /* Incomplete structure */
 108
 109
 110 /* Prototypes */
 111
 112 /* General utilities */
 113 u_short IpChecksum(struct ip *);
 114 u_short TcpChecksum(struct ip *);
 115 void DifferentialChecksum(u_short *, u_short *, u_short *, int);
 116
 117 /* Internal data access */
 118 struct alias_link *
 119 FindIcmpIn(struct in_addr, struct in_addr, u_short, int);
 120
 121 struct alias_link *
 122 FindIcmpOut(struct in_addr, struct in_addr, u_short, int);
 123
 124 struct alias_link *
 125 FindFragmentIn1(struct in_addr, struct in_addr, u_short);
 126
 127 struct alias_link *
 128 FindFragmentIn2(struct in_addr, struct in_addr, u_short);
 129
 130 struct alias_link *
 131 AddFragmentPtrLink(struct in_addr, u_short);
 132
 133 struct alias_link *
 134 FindFragmentPtr(struct in_addr, u_short);
 135
 136 struct alias_link *
 137 FindProtoIn(struct in_addr, struct in_addr, u_char);
 138
 139 struct alias_link *
 140 FindProtoOut(struct in_addr, struct in_addr, u_char);
 141
 142 struct alias_link *
 143 FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char, int);
 144
 145 struct alias_link *
 146 FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char, int);
 147
 148 struct alias_link *
 149 AddPptp(struct in_addr, struct in_addr, struct in_addr, u_int16_t);
 150
 151 struct alias_link *
 152 FindPptpOutByCallId(struct in_addr, struct in_addr, u_int16_t);
 153
 154 struct alias_link *
 155 FindPptpInByCallId(struct in_addr, struct in_addr, u_int16_t);
 156
 157 struct alias_link *
 158 FindPptpOutByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
 159
 160 struct alias_link *
 161 FindPptpInByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
 162
 163 struct alias_link *
 164 FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
 165
 166 struct in_addr
 167 FindOriginalAddress(struct in_addr);
 168
 169 struct in_addr
 170 FindAliasAddress(struct in_addr);
 171
 172 /* External data access/modification */
 173 int FindNewPortGroup(struct in_addr, struct in_addr,
 174                      u_short, u_short, u_short, u_char, u_char);
 175 void GetFragmentAddr(struct alias_link *, struct in_addr *);
 176 void SetFragmentAddr(struct alias_link *, struct in_addr);
 177 void GetFragmentPtr(struct alias_link *, char **);
 178 void SetFragmentPtr(struct alias_link *, char *);
 179 void SetStateIn(struct alias_link *, int);
 180 void SetStateOut(struct alias_link *, int);
 181 int GetStateIn(struct alias_link *);
 182 int GetStateOut(struct alias_link *);
 183 struct in_addr GetOriginalAddress(struct alias_link *);
 184 struct in_addr GetDestAddress(struct alias_link *);
 185 struct in_addr GetAliasAddress(struct alias_link *);
 186 struct in_addr GetDefaultAliasAddress(void);
 187 void SetDefaultAliasAddress(struct in_addr);
 188 u_short GetOriginalPort(struct alias_link *);
 189 u_short GetAliasPort(struct alias_link *);
 190 struct in_addr GetProxyAddress(struct alias_link *);
 191 void SetProxyAddress(struct alias_link *, struct in_addr);
 192 u_short GetProxyPort(struct alias_link *);
 193 void SetProxyPort(struct alias_link *, u_short);
 194 void SetAckModified(struct alias_link *);
 195 int GetAckModified(struct alias_link *);
 196 int GetDeltaAckIn(struct ip *, struct alias_link *);
 197 int GetDeltaSeqOut(struct ip *, struct alias_link *);
 198 void AddSeq(struct ip *, struct alias_link *, int);
 199 void SetExpire(struct alias_link *, int);
 200 void ClearCheckNewLink(void);
 201 void SetLastLineCrlfTermed(struct alias_link *, int);
 202 int GetLastLineCrlfTermed(struct alias_link *);
 203 void SetDestCallId(struct alias_link *, u_int16_t);
 204 #ifndef NO_FW_PUNCH
 205 void PunchFWHole(struct alias_link *);
 206 #endif
 207
 208
 209 /* Housekeeping function */
 210 void HouseKeeping(void);
 211
 212 /* Tcp specfic routines */
 213 /*lint -save -library Suppress flexelint warnings */
 214
 215 /* FTP routines */
 216 void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
 217
 218 /* IRC routines */
 219 void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
 220
 221 /* RTSP routines */
 222 void AliasHandleRtspOut(struct ip *, struct alias_link *, int);
 223
 224 /* PPTP routines */
 225 void AliasHandlePptpOut(struct ip *, struct alias_link *);
 226 void AliasHandlePptpIn(struct ip *, struct alias_link *);
 227 int AliasHandlePptpGreOut(struct ip *);
 228 int AliasHandlePptpGreIn(struct ip *);
 229
 230 /* NetBIOS routines */
 231 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
 232 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
 233
 234 /* CUSeeMe routines */
 235 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
 236 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
 237
 238 /* Transparent proxy routines */
 239 int ProxyCheck(struct ip *, struct in_addr *, u_short *);
 240 void ProxyModify(struct alias_link *, struct ip *, int, int);
 241
 242
 243 enum alias_tcp_state {
 244         ALIAS_TCP_STATE_NOT_CONNECTED,
 245         ALIAS_TCP_STATE_CONNECTED,
 246         ALIAS_TCP_STATE_DISCONNECTED
 247 };
 248
 249 /*lint -restore */
 250
 251 #endif /* !_ALIAS_LOCAL_H_ */