alias/alias_local.h

   1 /* -*- mode: c; tab-width: 3; c-basic-offset: 3; -*-
   2     Alias_local.h contains the function prototypes for alias.c,
   3     alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
   4     as any future add-ons).  It also includes macros, globals and
   5     struct definitions shared by more than one alias*.c file.
   6
   7     This include file is intended to be used only within the aliasing
   8     software.  Outside world interfaces are defined in alias.h
   9
  10     This software is placed into the public domain with no restrictions
  11     on its distribution.
  12
  13     Initial version:  August, 1996  (cjm)
  14
  15      <updated several times by original author and Eivind Eiklund>
  16 */
  17 #ifndef ALIAS_LOCAL_H
  18 #define ALIAS_LOCAL_H
  19
  20
  21 /*
  22     Macros
  23  */
  24
  25 /*
  26    The following macro is used to update an
  27    internet checksum.  "delta" is a 32-bit
  28    accumulation of all the changes to the
  29    checksum (adding in new 16-bit words and
  30    subtracting out old words), and "cksum"
  31    is the checksum value to be updated.
  32 */
  33 #define ADJUST_CHECKSUM(acc, cksum) { \
  34     acc += cksum; \
  35     if (acc < 0) \
  36     { \
  37         acc = -acc; \
  38         acc = (acc >> 16) + (acc & 0xffff); \
  39         acc += acc >> 16; \
  40         cksum = (u_short) ~acc; \
  41     } \
  42     else \
  43     { \
  44         acc = (acc >> 16) + (acc & 0xffff); \
  45         acc += acc >> 16; \
  46         cksum = (u_short) acc; \
  47     } \
  48 }
  49
  50
  51 /*
  52     Globals
  53 */
  54
  55 extern int packetAliasMode;
  56
  57
  58 /*
  59     Structs
  60 */
  61
  62 struct alias_link;    /* Incomplete structure */
  63
  64
  65 /*
  66     Prototypes
  67 */
  68
  69 /* General utilities */
  70 u_short IpChecksum(struct ip *);
  71 u_short TcpChecksum(struct ip *);
  72 void DifferentialChecksum(u_short *, u_short *, u_short *, int);
  73
  74 /* Internal data access */
  75 struct alias_link *
  76 FindIcmpIn(struct in_addr, struct in_addr, u_short);
  77
  78 struct alias_link *
  79 FindIcmpOut(struct in_addr, struct in_addr, u_short);
  80
  81 struct alias_link *
  82 FindFragmentIn1(struct in_addr, struct in_addr, u_short);
  83
  84 struct alias_link *
  85 FindFragmentIn2(struct in_addr, struct in_addr, u_short);
  86
  87 struct alias_link *
  88 AddFragmentPtrLink(struct in_addr, u_short);
  89
  90 struct alias_link *
  91 FindFragmentPtr(struct in_addr, u_short);
  92
  93 struct alias_link *
  94 FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
  95
  96 struct alias_link *
  97 FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
  98
  99 struct in_addr
 100 FindOriginalAddress(struct in_addr);
 101
 102 struct in_addr
 103 FindAliasAddress(struct in_addr);
 104
 105 /* External data access/modification */
 106 void GetFragmentAddr(struct alias_link *, struct in_addr *);
 107 void SetFragmentAddr(struct alias_link *, struct in_addr);
 108 void GetFragmentPtr(struct alias_link *, char **);
 109 void SetFragmentPtr(struct alias_link *, char *);
 110 void SetStateIn(struct alias_link *, int);
 111 void SetStateOut(struct alias_link *, int);
 112 int GetStateIn(struct alias_link *);
 113 int GetStateOut(struct alias_link *);
 114 struct in_addr GetOriginalAddress(struct alias_link *);
 115 struct in_addr GetDestAddress(struct alias_link *);
 116 struct in_addr GetAliasAddress(struct alias_link *);
 117 struct in_addr GetDefaultAliasAddress(void);
 118 void SetDefaultAliasAddress(struct in_addr);
 119 u_short GetOriginalPort(struct alias_link *);
 120 u_short GetAliasPort(struct alias_link *);
 121 struct in_addr GetProxyAddress(struct alias_link *);
 122 void SetProxyAddress(struct alias_link *, struct in_addr);
 123 u_short GetProxyPort(struct alias_link *);
 124 void SetProxyPort(struct alias_link *, u_short);
 125 void SetAckModified(struct alias_link *);
 126 int GetAckModified(struct alias_link *);
 127 int GetDeltaAckIn(struct ip *, struct alias_link *);
 128 int GetDeltaSeqOut(struct ip *, struct alias_link *);
 129 void AddSeq(struct ip *, struct alias_link *, int);
 130 void SetExpire(struct alias_link *, int);
 131 void ClearCheckNewLink(void);
 132 #ifndef NO_FW_PUNCH
 133 void PunchFWHole(struct alias_link *);
 134 #endif
 135
 136
 137 /* Housekeeping function */
 138 void HouseKeeping(void);
 139
 140 /* Tcp specfic routines */
 141 /*lint -save -library Suppress flexelint warnings */
 142
 143 /* FTP routines */
 144 void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
 145
 146 /* IRC routines */
 147 void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
 148
 149 /* NetBIOS routines */
 150 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
 151 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
 152
 153 /* CUSeeMe routines */
 154 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
 155 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
 156
 157 /* Transparent proxy routines */
 158 int ProxyCheck(struct ip *, struct in_addr *, u_short *);
 159 void ProxyModify(struct alias_link *, struct ip *, int, int);
 160
 161
 162 enum alias_tcp_state {
 163     ALIAS_TCP_STATE_NOT_CONNECTED,
 164     ALIAS_TCP_STATE_CONNECTED,
 165     ALIAS_TCP_STATE_DISCONNECTED
 166 };
 167
 168 int GetPptpAlias (struct in_addr*);
 169 /*lint -restore */
 170 #endif /* defined(ALIAS_LOCAL_H) */