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) */ 171