From 8aecee51588291b6046d31ad2e17f8a9a65f60bf Mon Sep 17 00:00:00 2001
From: Tim Angus <tim@ngus.net>
Date: Sat, 22 Apr 2006 22:21:56 +0000
Subject: [PATCH] * cl_guid for semi-reliable server authentication (from tjw)

---
 Makefile               |  2 ++
 code/client/cl_main.c  | 25 +++++++++++++++++++++++++
 code/client/client.h   |  3 +++
 code/qcommon/qcommon.h |  1 +
 4 files changed, 31 insertions(+)

diff --git a/Makefile b/Makefile
index 8fa30aaf..b8aa4a59 100644
--- a/Makefile
+++ b/Makefile
@@ -779,6 +779,7 @@ Q3OBJ = \
   $(B)/client/cvar.o \
   $(B)/client/files.o \
   $(B)/client/md4.o \
+  $(B)/client/md5.o \
   $(B)/client/msg.o \
   $(B)/client/net_chan.o \
   $(B)/client/huffman.o \
@@ -1029,6 +1030,7 @@ $(B)/client/common.o : $(CMDIR)/common.c; $(DO_CC)
 $(B)/client/cvar.o : $(CMDIR)/cvar.c; $(DO_CC)
 $(B)/client/files.o : $(CMDIR)/files.c; $(DO_CC)
 $(B)/client/md4.o : $(CMDIR)/md4.c; $(DO_CC)
+$(B)/client/md5.o : $(CMDIR)/md5.c; $(DO_CC)
 $(B)/client/msg.o : $(CMDIR)/msg.c; $(DO_CC)
 $(B)/client/net_chan.o : $(CMDIR)/net_chan.c; $(DO_CC)
 $(B)/client/huffman.o : $(CMDIR)/huffman.c; $(DO_CC)
diff --git a/code/client/cl_main.c b/code/client/cl_main.c
index 9d896799..8f9cbae9 100644
--- a/code/client/cl_main.c
+++ b/code/client/cl_main.c
@@ -2378,6 +2378,28 @@ void CL_StopVideo_f( void )
   CL_CloseAVI( );
 }
 
+static void CL_GenerateQKey(void)
+{
+	int len = 0;
+	unsigned char buff[2048];
+
+	len = FS_ReadFile(QKEY_FILE, NULL);
+	if(len >= (int)sizeof(buff)) {
+		Com_Printf("QKEY found.\n");
+		return;
+	}
+	else {
+		int i;
+		srand(time(0));
+		for(i = 0; i < sizeof(buff) - 1; i++) {
+			buff[i] = (unsigned char)(rand() % 255);
+		}
+		buff[i] = 0;
+		Com_Printf("QKEY generated\n");
+		FS_WriteFile(QKEY_FILE, buff, sizeof(buff));
+	}
+} 
+
 /*
 ====================
 CL_Init
@@ -2526,6 +2548,9 @@ void CL_Init( void ) {
 
 	Cvar_Set( "cl_running", "1" );
 
+	CL_GenerateQKey();	
+	Cvar_Get("cl_guid", Com_MD5File(QKEY_FILE, 0), CVAR_USERINFO | CVAR_ROM);
+
 	Com_Printf( "----- Client Initialization Complete -----\n" );
 }
 
diff --git a/code/client/client.h b/code/client/client.h
index 73106f8c..a9d0006f 100644
--- a/code/client/client.h
+++ b/code/client/client.h
@@ -30,6 +30,9 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "../cgame/cg_public.h"
 #include "../game/bg_public.h"
 
+// tjw: file full of random crap that gets used to create cl_guid
+#define QKEY_FILE "qkey"
+
 #define	RETRANSMIT_TIMEOUT	3000	// time between connection packet retransmits
 
 
diff --git a/code/qcommon/qcommon.h b/code/qcommon/qcommon.h
index 5de428ff..65cc7be8 100644
--- a/code/qcommon/qcommon.h
+++ b/code/qcommon/qcommon.h
@@ -729,6 +729,7 @@ void 		Com_Quit_f( void );
 int			Com_EventLoop( void );
 int			Com_Milliseconds( void );	// will be journaled properly
 unsigned	Com_BlockChecksum( const void *buffer, int length );
+char		*Com_MD5File(const char *filename, int length);
 int			Com_HashKey(char *string, int maxlen);
 int			Com_Filter(char *filter, char *name, int casesensitive);
 int			Com_FilterPath(char *filter, char *name, int casesensitive);