lib/libalias/alias_local.h

   1 /*-
   2  * Copyright (c) 2001 Charles Mott <cm@linktel.net>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   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.
  13  *
  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
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/libalias/alias_local.h,v 1.10.2.7 2001/11/23 13:10:15 brian Exp $
  27  * $DragonFly: src/lib/libalias/alias_local.h,v 1.2 2003/06/17 06:26:41 dillon Exp $
  28  */
  29
  30 /*
  31  * Alias_local.h contains the function prototypes for alias.c,
  32  * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
  33  * as any future add-ons).  It also includes macros, globals and
  34  * struct definitions shared by more than one alias*.c file.
  35  *
  36  * This include file is intended to be used only within the aliasing
  37  * software.  Outside world interfaces are defined in alias.h
  38  *
  39  * This software is placed into the public domain with no restrictions
  40  * on its distribution.
  41  *
  42  * Initial version:  August, 1996  (cjm)
  43  *
  44  * <updated several times by original author and Eivind Eklund>
  45  */
  46
  47 #ifndef _ALIAS_LOCAL_H_
  48 #define _ALIAS_LOCAL_H_
  49
  50 /* Macros */
  51
  52 /*
  53  * The following macro is used to update an
  54  * internet checksum.  "delta" is a 32-bit
  55  * accumulation of all the changes to the
  56  * checksum (adding in new 16-bit words and
  57  * subtracting out old words), and "cksum"
  58  * is the checksum value to be updated.
  59  */
  60 #define ADJUST_CHECKSUM(acc, cksum) \
  61         do { \
  62                 acc += cksum; \
  63                 if (acc < 0) { \
  64                         acc = -acc; \
  65                         acc = (acc >> 16) + (acc & 0xffff); \
  66                         acc += acc >> 16; \
  67                         cksum = (u_short) ~acc; \
  68                 } else { \
  69                         acc = (acc >> 16) + (acc & 0xffff); \
  70                         acc += acc >> 16; \
  71                         cksum = (u_short) acc; \
  72                 } \
  73         } while (0)
  74
  75 /* Globals */
  76
  77 extern int packetAliasMode;
  78
  79 /* Prototypes */
  80
  81 /* General utilities */
  82 u_short  IpChecksum(struct ip *_pip);
  83 u_short  TcpChecksum(struct ip *_pip);
  84 void     DifferentialChecksum(u_short *_cksum, u_short *_new, u_short *_old,
  85             int _n);
  86
  87 /* Internal data access */
  88 struct alias_link *
  89          FindIcmpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
  90             u_short _id_alias, int _create);
  91 struct alias_link *
  92          FindIcmpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
  93             u_short _id, int _create);
  94 struct alias_link *
  95          FindFragmentIn1(struct in_addr _dst_addr, struct in_addr _alias_addr,
  96             u_short _ip_id);
  97 struct alias_link *
  98          FindFragmentIn2(struct in_addr _dst_addr, struct in_addr _alias_addr,
  99             u_short _ip_id);
 100 struct alias_link *
 101          AddFragmentPtrLink(struct in_addr _dst_addr, u_short _ip_id);
 102 struct alias_link *
 103          FindFragmentPtr(struct in_addr _dst_addr, u_short _ip_id);
 104 struct alias_link *
 105          FindProtoIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
 106             u_char _proto);
 107 struct alias_link *
 108          FindProtoOut(struct in_addr _src_addr, struct in_addr _dst_addr,
 109             u_char _proto);
 110 struct alias_link *
 111          FindUdpTcpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
 112             u_short _dst_port, u_short _alias_port, u_char _proto, int _create);
 113 struct alias_link *
 114          FindUdpTcpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
 115             u_short _src_port, u_short _dst_port, u_char _proto, int _create);
 116 struct alias_link *
 117          AddPptp(struct in_addr _src_addr, struct in_addr _dst_addr,
 118             struct in_addr _alias_addr, u_int16_t _src_call_id);
 119 struct alias_link *
 120          FindPptpOutByCallId(struct in_addr _src_addr,
 121             struct in_addr _dst_addr, u_int16_t _src_call_id);
 122 struct alias_link *
 123          FindPptpInByCallId(struct in_addr _dst_addr,
 124             struct in_addr _alias_addr, u_int16_t _dst_call_id);
 125 struct alias_link *
 126          FindPptpOutByPeerCallId(struct in_addr _src_addr,
 127             struct in_addr _dst_addr, u_int16_t _dst_call_id);
 128 struct alias_link *
 129          FindPptpInByPeerCallId(struct in_addr _dst_addr,
 130             struct in_addr _alias_addr, u_int16_t _alias_call_id);
 131 struct alias_link *
 132          FindRtspOut(struct in_addr _src_addr, struct in_addr _dst_addr,
 133             u_short _src_port, u_short _alias_port, u_char _proto);
 134 struct in_addr
 135          FindOriginalAddress(struct in_addr _alias_addr);
 136 struct in_addr
 137          FindAliasAddress(struct in_addr _original_addr);
 138
 139 /* External data access/modification */
 140 int      FindNewPortGroup(struct in_addr _dst_addr, struct in_addr _alias_addr,
 141                      u_short _src_port, u_short _dst_port, u_short _port_count,
 142                      u_char _proto, u_char _align);
 143 void     GetFragmentAddr(struct alias_link *_link, struct in_addr *_src_addr);
 144 void     SetFragmentAddr(struct alias_link *_link, struct in_addr _src_addr);
 145 void     GetFragmentPtr(struct alias_link *_link, char **_fptr);
 146 void     SetFragmentPtr(struct alias_link *_link, char *fptr);
 147 void     SetStateIn(struct alias_link *_link, int _state);
 148 void     SetStateOut(struct alias_link *_link, int _state);
 149 int      GetStateIn(struct alias_link *_link);
 150 int      GetStateOut(struct alias_link *_link);
 151 struct in_addr
 152          GetOriginalAddress(struct alias_link *_link);
 153 struct in_addr
 154          GetDestAddress(struct alias_link *_link);
 155 struct in_addr
 156          GetAliasAddress(struct alias_link *_link);
 157 struct in_addr
 158          GetDefaultAliasAddress(void);
 159 void     SetDefaultAliasAddress(struct in_addr _alias_addr);
 160 u_short  GetOriginalPort(struct alias_link *_link);
 161 u_short  GetAliasPort(struct alias_link *_link);
 162 struct in_addr
 163          GetProxyAddress(struct alias_link *_link);
 164 void     SetProxyAddress(struct alias_link *_link, struct in_addr _addr);
 165 u_short  GetProxyPort(struct alias_link *_link);
 166 void     SetProxyPort(struct alias_link *_link, u_short _port);
 167 void     SetAckModified(struct alias_link *_link);
 168 int      GetAckModified(struct alias_link *_link);
 169 int      GetDeltaAckIn(struct ip *_pip, struct alias_link *_link);
 170 int      GetDeltaSeqOut(struct ip *_pip, struct alias_link *_link);
 171 void     AddSeq(struct ip *_pip, struct alias_link *_link, int _delta);
 172 void     SetExpire(struct alias_link *_link, int _expire);
 173 void     ClearCheckNewLink(void);
 174 void     SetLastLineCrlfTermed(struct alias_link *_link, int _yes);
 175 int      GetLastLineCrlfTermed(struct alias_link *_link);
 176 void     SetDestCallId(struct alias_link *_link, u_int16_t _cid);
 177 #ifndef NO_FW_PUNCH
 178 void     PunchFWHole(struct alias_link *_link);
 179 #endif
 180
 181 /* Housekeeping function */
 182 void     HouseKeeping(void);
 183
 184 /* Tcp specfic routines */
 185 /* lint -save -library Suppress flexelint warnings */
 186
 187 /* FTP routines */
 188 void     AliasHandleFtpOut(struct ip *_pip, struct alias_link *_link,
 189             int _maxpacketsize);
 190
 191 /* IRC routines */
 192 void     AliasHandleIrcOut(struct ip *_pip, struct alias_link *_link,
 193             int _maxsize);
 194
 195 /* RTSP routines */
 196 void     AliasHandleRtspOut(struct ip *_pip, struct alias_link *_link,
 197             int _maxpacketsize);
 198
 199 /* PPTP routines */
 200 void     AliasHandlePptpOut(struct ip *_pip, struct alias_link *_link);
 201 void     AliasHandlePptpIn(struct ip *_pip, struct alias_link *_link);
 202 int      AliasHandlePptpGreOut(struct ip *_pip);
 203 int      AliasHandlePptpGreIn(struct ip *_pip);
 204
 205 /* NetBIOS routines */
 206 int      AliasHandleUdpNbt(struct ip *_pip, struct alias_link *_link,
 207             struct in_addr *_alias_address, u_short _alias_port);
 208 int      AliasHandleUdpNbtNS(struct ip *_pip, struct alias_link *_link,
 209             struct in_addr *_alias_address, u_short *_alias_port,
 210             struct in_addr *_original_address, u_short *_original_port);
 211
 212 /* CUSeeMe routines */
 213 void     AliasHandleCUSeeMeOut(struct ip *_pip, struct alias_link *_link);
 214 void     AliasHandleCUSeeMeIn(struct ip *_pip, struct in_addr _original_addr);
 215
 216 /* Transparent proxy routines */
 217 int      ProxyCheck(struct ip *_pip, struct in_addr *_proxy_server_addr,
 218             u_short *_proxy_server_port);
 219 void     ProxyModify(struct alias_link *_link, struct ip *_pip,
 220             int _maxpacketsize, int _proxy_type);
 221
 222 enum alias_tcp_state {
 223         ALIAS_TCP_STATE_NOT_CONNECTED,
 224         ALIAS_TCP_STATE_CONNECTED,
 225         ALIAS_TCP_STATE_DISCONNECTED
 226 };
 227
 228 /*lint -restore */
 229
 230 #endif /* !_ALIAS_LOCAL_H_ */