Version 3.0: January 1, 1999

    - Transparent proxying support added.
    - PPTP redirecting support added based on patches
      contributed by Dru Nelson <dnelson@redwoodsoft.com>.

Submitted by: Charles Mott <cmott@srv.net>

1 files changed, 67 insertions, 4 deletions

diff --git a/lib/libalias/alias_local.h b/lib/libalias/alias_local.h
index 38462810733a..da451259cdf0 100644
--- a/lib/libalias/alias_local.h
+++ b/lib/libalias/alias_local.h
@@ -1,9 +1,11 @@
 /* -*- mode: c; tab-width: 3; c-basic-offset: 3; -*-
     Alias_local.h contains the function prototypes for alias.c,
     alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
-    as any future add-ons).  It is intended to be used only within
-    the aliasing software.  Outside world interfaces are defined
-    in alias.h
+    as any future add-ons).  It also includes macros, globals and
+    struct definitions shared by more than one alias*.c file.
+
+    This include file is intended to be used only within the aliasing
+    software.  Outside world interfaces are defined in alias.h
 
     This software is placed into the public domain with no restrictions
     on its distribution.
@@ -15,9 +17,54 @@
 #ifndef ALIAS_LOCAL_H
 #define ALIAS_LOCAL_H
 
+
+/*
+    Macros
+ */
+
+/*
+   The following macro is used to update an
+   internet checksum.  "delta" is a 32-bit
+   accumulation of all the changes to the
+   checksum (adding in new 16-bit words and
+   subtracting out old words), and "cksum"
+   is the checksum value to be updated.
+*/
+#define ADJUST_CHECKSUM(acc, cksum) { \
+    acc += cksum; \
+    if (acc < 0) \
+    { \
+        acc = -acc; \
+        acc = (acc >> 16) + (acc & 0xffff); \
+        acc += acc >> 16; \
+        cksum = (u_short) ~acc; \
+    } \
+    else \
+    { \
+        acc = (acc >> 16) + (acc & 0xffff); \
+        acc += acc >> 16; \
+        cksum = (u_short) acc; \
+    } \
+}
+
+
+/*
+    Globals
+*/
+
 extern int packetAliasMode;
 
-struct alias_link;
+
+/*
+    Structs
+*/
+
+struct alias_link;    /* Incomplete structure */
+
+
+/*
+    Prototypes
+*/
 
 /* General utilities */
 u_short IpChecksum(struct ip *);
@@ -71,6 +118,10 @@ struct in_addr GetDefaultAliasAddress(void);
 void SetDefaultAliasAddress(struct in_addr);
 u_short GetOriginalPort(struct alias_link *);
 u_short GetAliasPort(struct alias_link *);
+struct in_addr GetProxyAddress(struct alias_link *);
+void SetProxyAddress(struct alias_link *, struct in_addr);
+u_short GetProxyPort(struct alias_link *);
+void SetProxyPort(struct alias_link *, u_short);
 void SetAckModified(struct alias_link *);
 int GetAckModified(struct alias_link *);
 int GetDeltaAckIn(struct ip *, struct alias_link *);
@@ -88,13 +139,24 @@ void HouseKeeping(void);
 
 /* Tcp specfic routines */
 /*lint -save -library Suppress flexelint warnings */
+
+/* FTP routines */
 void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
+
+/* IRC routines */
 void AliasHandleIrcOut(struct ip *pip, struct alias_link *link, int maxsize );
+
+/* NetBIOS routines */
 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
+
+/* CUSeeMe routines */
 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
 
+/* Transparent proxy routines */
+int ProxyCheck(struct ip *, struct in_addr *, u_short *);
+void ProxyModify(struct alias_link *, struct ip *, int, int);
 
 
 enum alias_tcp_state {
@@ -103,5 +165,6 @@ enum alias_tcp_state {
     ALIAS_TCP_STATE_DISCONNECTED
 };
 
+int GetPptpAlias (struct in_addr*);
 /*lint -restore */
 #endif /* defined(ALIAS_LOCAL_H) */