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 Eklund> 16 17 $FreeBSD$ 18 */ 19 #ifndef ALIAS_LOCAL_H 20 #define ALIAS_LOCAL_H 21 22 #ifndef NULL 23 #define NULL 0 24 #endif 25 26 /* 27 Macros 28 */ 29 30 /* 31 The following macro is used to update an 32 internet checksum. "delta" is a 32-bit 33 accumulation of all the changes to the 34 checksum (adding in new 16-bit words and 35 subtracting out old words), and "cksum" 36 is the checksum value to be updated. 37 */ 38 #define ADJUST_CHECKSUM(acc, cksum) { \ 39 acc += cksum; \ 40 if (acc < 0) \ 41 { \ 42 acc = -acc; \ 43 acc = (acc >> 16) + (acc & 0xffff); \ 44 acc += acc >> 16; \ 45 cksum = (u_short) ~acc; \ 46 } \ 47 else \ 48 { \ 49 acc = (acc >> 16) + (acc & 0xffff); \ 50 acc += acc >> 16; \ 51 cksum = (u_short) acc; \ 52 } \ 53 } 54 55 56 /* 57 Globals 58 */ 59 60 extern int packetAliasMode; 61 62 63 /* 64 Structs 65 */ 66 67 struct alias_link; /* Incomplete structure */ 68 69 70 /* 71 Prototypes 72 */ 73 74 /* General utilities */ 75 u_short IpChecksum(struct ip *); 76 u_short TcpChecksum(struct ip *); 77 void DifferentialChecksum(u_short *, u_short *, u_short *, int); 78 79 /* Internal data access */ 80 struct alias_link * 81 FindIcmpIn(struct in_addr, struct in_addr, u_short, int); 82 83 struct alias_link * 84 FindIcmpOut(struct in_addr, struct in_addr, u_short, int); 85 86 struct alias_link * 87 FindFragmentIn1(struct in_addr, struct in_addr, u_short); 88 89 struct alias_link * 90 FindFragmentIn2(struct in_addr, struct in_addr, u_short); 91 92 struct alias_link * 93 AddFragmentPtrLink(struct in_addr, u_short); 94 95 struct alias_link * 96 FindFragmentPtr(struct in_addr, u_short); 97 98 struct alias_link * 99 FindProtoIn(struct in_addr, struct in_addr, u_char); 100 101 struct alias_link * 102 FindProtoOut(struct in_addr, struct in_addr, u_char); 103 104 struct alias_link * 105 FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char, int); 106 107 struct alias_link * 108 FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char, int); 109 110 struct alias_link * 111 AddPptp(struct in_addr, struct in_addr, struct in_addr, u_int16_t); 112 113 struct alias_link * 114 FindPptpOutByCallId(struct in_addr, struct in_addr, u_int16_t); 115 116 struct alias_link * 117 FindPptpInByCallId(struct in_addr, struct in_addr, u_int16_t); 118 119 struct alias_link * 120 FindPptpOutByPeerCallId(struct in_addr, struct in_addr, u_int16_t); 121 122 struct alias_link * 123 FindPptpInByPeerCallId(struct in_addr, struct in_addr, u_int16_t); 124 125 struct alias_link * 126 FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char); 127 128 struct in_addr 129 FindOriginalAddress(struct in_addr); 130 131 struct in_addr 132 FindAliasAddress(struct in_addr); 133 134 /* External data access/modification */ 135 int FindNewPortGroup(struct in_addr, struct in_addr, 136 u_short, u_short, u_short, u_char, u_char); 137 void GetFragmentAddr(struct alias_link *, struct in_addr *); 138 void SetFragmentAddr(struct alias_link *, struct in_addr); 139 void GetFragmentPtr(struct alias_link *, char **); 140 void SetFragmentPtr(struct alias_link *, char *); 141 void SetStateIn(struct alias_link *, int); 142 void SetStateOut(struct alias_link *, int); 143 int GetStateIn(struct alias_link *); 144 int GetStateOut(struct alias_link *); 145 struct in_addr GetOriginalAddress(struct alias_link *); 146 struct in_addr GetDestAddress(struct alias_link *); 147 struct in_addr GetAliasAddress(struct alias_link *); 148 struct in_addr GetDefaultAliasAddress(void); 149 void SetDefaultAliasAddress(struct in_addr); 150 u_short GetOriginalPort(struct alias_link *); 151 u_short GetAliasPort(struct alias_link *); 152 struct in_addr GetProxyAddress(struct alias_link *); 153 void SetProxyAddress(struct alias_link *, struct in_addr); 154 u_short GetProxyPort(struct alias_link *); 155 void SetProxyPort(struct alias_link *, u_short); 156 void SetAckModified(struct alias_link *); 157 int GetAckModified(struct alias_link *); 158 int GetDeltaAckIn(struct ip *, struct alias_link *); 159 int GetDeltaSeqOut(struct ip *, struct alias_link *); 160 void AddSeq(struct ip *, struct alias_link *, int); 161 void SetExpire(struct alias_link *, int); 162 void ClearCheckNewLink(void); 163 void SetLastLineCrlfTermed(struct alias_link *, int); 164 int GetLastLineCrlfTermed(struct alias_link *); 165 void SetDestCallId(struct alias_link *, u_int16_t); 166 #ifndef NO_FW_PUNCH 167 void PunchFWHole(struct alias_link *); 168 #endif 169 170 171 /* Housekeeping function */ 172 void HouseKeeping(void); 173 174 /* Tcp specfic routines */ 175 /*lint -save -library Suppress flexelint warnings */ 176 177 /* FTP routines */ 178 void AliasHandleFtpOut(struct ip *, struct alias_link *, int); 179 180 /* IRC routines */ 181 void AliasHandleIrcOut(struct ip *, struct alias_link *, int); 182 183 /* RTSP routines */ 184 void AliasHandleRtspOut(struct ip *, struct alias_link *, int); 185 186 /* PPTP routines */ 187 void AliasHandlePptpOut(struct ip *, struct alias_link *); 188 void AliasHandlePptpIn(struct ip *, struct alias_link *); 189 int AliasHandlePptpGreOut(struct ip *); 190 int AliasHandlePptpGreIn(struct ip *); 191 192 /* NetBIOS routines */ 193 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short); 194 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *); 195 196 /* CUSeeMe routines */ 197 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *); 198 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr); 199 200 /* Transparent proxy routines */ 201 int ProxyCheck(struct ip *, struct in_addr *, u_short *); 202 void ProxyModify(struct alias_link *, struct ip *, int, int); 203 204 205 enum alias_tcp_state { 206 ALIAS_TCP_STATE_NOT_CONNECTED, 207 ALIAS_TCP_STATE_CONNECTED, 208 ALIAS_TCP_STATE_DISCONNECTED 209 }; 210 /*lint -restore */ 211 #endif /* defined(ALIAS_LOCAL_H) */ 212