alias/alias_local.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*-
  26  * Copyright (c) 2001 Charles Mott <cmott@scientech.com>
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  *
  50  * Based upon:
  51  * $FreeBSD: src/lib/libalias/alias_local.h,v 1.10.2.5 2001/08/01 09:52:26 obrien Exp $
  52  */
  53
  54 /*
  55  * Alias_local.h contains the function prototypes for alias.c,
  56  * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
  57  * as any future add-ons).  It also includes macros, globals and
  58  * struct definitions shared by more than one alias*.c file.
  59  *
  60  * This include file is intended to be used only within the aliasing
  61  * software.  Outside world interfaces are defined in alias.h
  62  *
  63  * This software is placed into the public domain with no restrictions
  64  * on its distribution.
  65  *
  66  * Initial version:  August, 1996  (cjm)
  67  *
  68  * <updated several times by original author and Eivind Eklund>
  69  */
  70
  71 #ifndef _ALIAS_LOCAL_H_
  72 #define _ALIAS_LOCAL_H_
  73
  74 #ifndef NULL
  75 #define NULL 0
  76 #endif
  77
  78 /* Macros */
  79
  80 /*
  81  * The following macro is used to update an
  82  * internet checksum.  "delta" is a 32-bit
  83  * accumulation of all the changes to the
  84  * checksum (adding in new 16-bit words and
  85  * subtracting out old words), and "cksum"
  86  * is the checksum value to be updated.
  87  */
  88 #define ADJUST_CHECKSUM(acc, cksum) \
  89         do { \
  90                 acc += cksum; \
  91                 if (acc < 0) { \
  92                         acc = -acc; \
  93                         acc = (acc >> 16) + (acc & 0xffff); \
  94                         acc += acc >> 16; \
  95                         cksum = (u_short) ~acc; \
  96                 } else { \
  97                         acc = (acc >> 16) + (acc & 0xffff); \
  98                         acc += acc >> 16; \
  99                         cksum = (u_short) acc; \
 100                 } \
 101         } while (0)
 102
 103 /* Globals */
 104
 105 extern int packetAliasMode;
 106
 107
 108 /* Structs */
 109
 110 struct alias_link;    /* Incomplete structure */
 111
 112
 113 /* Prototypes */
 114
 115 /* General utilities */
 116 u_short IpChecksum(struct ip *);
 117 u_short TcpChecksum(struct ip *);
 118 void DifferentialChecksum(u_short *, u_short *, u_short *, int);
 119
 120 /* Internal data access */
 121 struct alias_link *
 122 FindIcmpIn(struct in_addr, struct in_addr, u_short, int);
 123
 124 struct alias_link *
 125 FindIcmpOut(struct in_addr, struct in_addr, u_short, int);
 126
 127 struct alias_link *
 128 FindFragmentIn1(struct in_addr, struct in_addr, u_short);
 129
 130 struct alias_link *
 131 FindFragmentIn2(struct in_addr, struct in_addr, u_short);
 132
 133 struct alias_link *
 134 AddFragmentPtrLink(struct in_addr, u_short);
 135
 136 struct alias_link *
 137 FindFragmentPtr(struct in_addr, u_short);
 138
 139 struct alias_link *
 140 FindProtoIn(struct in_addr, struct in_addr, u_char);
 141
 142 struct alias_link *
 143 FindProtoOut(struct in_addr, struct in_addr, u_char);
 144
 145 struct alias_link *
 146 FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char, int);
 147
 148 struct alias_link *
 149 FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char, int);
 150
 151 struct alias_link *
 152 AddPptp(struct in_addr, struct in_addr, struct in_addr, u_int16_t);
 153
 154 struct alias_link *
 155 FindPptpOutByCallId(struct in_addr, struct in_addr, u_int16_t);
 156
 157 struct alias_link *
 158 FindPptpInByCallId(struct in_addr, struct in_addr, u_int16_t);
 159
 160 struct alias_link *
 161 FindPptpOutByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
 162
 163 struct alias_link *
 164 FindPptpInByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
 165
 166 struct alias_link *
 167 FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
 168
 169 struct in_addr
 170 FindOriginalAddress(struct in_addr);
 171
 172 struct in_addr
 173 FindAliasAddress(struct in_addr);
 174
 175 /* External data access/modification */
 176 int FindNewPortGroup(struct in_addr, struct in_addr,
 177                      u_short, u_short, u_short, u_char, u_char);
 178 void GetFragmentAddr(struct alias_link *, struct in_addr *);
 179 void SetFragmentAddr(struct alias_link *, struct in_addr);
 180 void GetFragmentPtr(struct alias_link *, char **);
 181 void SetFragmentPtr(struct alias_link *, char *);
 182 void SetStateIn(struct alias_link *, int);
 183 void SetStateOut(struct alias_link *, int);
 184 int GetStateIn(struct alias_link *);
 185 int GetStateOut(struct alias_link *);
 186 struct in_addr GetOriginalAddress(struct alias_link *);
 187 struct in_addr GetDestAddress(struct alias_link *);
 188 struct in_addr GetAliasAddress(struct alias_link *);
 189 struct in_addr GetDefaultAliasAddress(void);
 190 void SetDefaultAliasAddress(struct in_addr);
 191 u_short GetOriginalPort(struct alias_link *);
 192 u_short GetAliasPort(struct alias_link *);
 193 struct in_addr GetProxyAddress(struct alias_link *);
 194 void SetProxyAddress(struct alias_link *, struct in_addr);
 195 u_short GetProxyPort(struct alias_link *);
 196 void SetProxyPort(struct alias_link *, u_short);
 197 void SetAckModified(struct alias_link *);
 198 int GetAckModified(struct alias_link *);
 199 int GetDeltaAckIn(struct ip *, struct alias_link *);
 200 int GetDeltaSeqOut(struct ip *, struct alias_link *);
 201 void AddSeq(struct ip *, struct alias_link *, int);
 202 void SetExpire(struct alias_link *, int);
 203 void ClearCheckNewLink(void);
 204 void SetLastLineCrlfTermed(struct alias_link *, int);
 205 int GetLastLineCrlfTermed(struct alias_link *);
 206 void SetDestCallId(struct alias_link *, u_int16_t);
 207 #ifndef NO_FW_PUNCH
 208 void PunchFWHole(struct alias_link *);
 209 #endif
 210
 211
 212 /* Housekeeping function */
 213 void HouseKeeping(void);
 214
 215 /* Tcp specfic routines */
 216 /*lint -save -library Suppress flexelint warnings */
 217
 218 /* FTP routines */
 219 void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
 220
 221 /* IRC routines */
 222 void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
 223
 224 /* RTSP routines */
 225 void AliasHandleRtspOut(struct ip *, struct alias_link *, int);
 226
 227 /* PPTP routines */
 228 void AliasHandlePptpOut(struct ip *, struct alias_link *);
 229 void AliasHandlePptpIn(struct ip *, struct alias_link *);
 230 int AliasHandlePptpGreOut(struct ip *);
 231 int AliasHandlePptpGreIn(struct ip *);
 232
 233 /* NetBIOS routines */
 234 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
 235 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
 236
 237 /* CUSeeMe routines */
 238 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
 239 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
 240
 241 /* Transparent proxy routines */
 242 int ProxyCheck(struct ip *, struct in_addr *, u_short *);
 243 void ProxyModify(struct alias_link *, struct ip *, int, int);
 244
 245
 246 enum alias_tcp_state {
 247         ALIAS_TCP_STATE_NOT_CONNECTED,
 248         ALIAS_TCP_STATE_CONNECTED,
 249         ALIAS_TCP_STATE_DISCONNECTED
 250 };
 251
 252 /*lint -restore */
 253
 254 #endif /* !_ALIAS_LOCAL_H_ */