From 14c372d49d49a21107c72b7c238cf9e5a01b80ab Mon Sep 17 00:00:00 2001
From: Darren Tucker <dtucker@zip.com.au>
Date: Mon, 30 Aug 2004 20:42:08 +1000
Subject: [PATCH]  - (dtucker) [session.c openbsd-compat/bsd-cygwin_util.{c,h}]
 Bug #915: only    copy required environment variables on Cygwin.  Patch from
 vinschen at    redhat.com, ok djm@

---
 ChangeLog                        |  7 ++++-
 openbsd-compat/bsd-cygwin_util.c | 54 ++++++++++++++++++++++++++++++--
 openbsd-compat/bsd-cygwin_util.h |  4 ++-
 session.c                        |  8 ++++-
 4 files changed, 68 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index a2f03d437..0e7cc0cd9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+20040830
+ - (dtucker) [session.c openbsd-compat/bsd-cygwin_util.{c,h}] Bug #915: only
+   copy required environment variables on Cygwin.  Patch from vinschen at
+   redhat.com, ok djm@
+
 20040829
  - (dtucker) [openbsd-compat/getrrsetbyname.c] Prevent getrrsetbyname from
    failing with NOMEMORY if no sigs are returned and malloc(0) returns NULL.
@@ -1707,4 +1712,4 @@
    - (djm) Trim deprecated options from INSTALL. Mention UsePAM
    - (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu
 
-$Id: ChangeLog,v 1.3536 2004/08/29 11:43:33 dtucker Exp $
+$Id: ChangeLog,v 1.3537 2004/08/30 10:42:08 dtucker Exp $
diff --git a/openbsd-compat/bsd-cygwin_util.c b/openbsd-compat/bsd-cygwin_util.c
index 92cdba6e0..f53abb6e2 100644
--- a/openbsd-compat/bsd-cygwin_util.c
+++ b/openbsd-compat/bsd-cygwin_util.c
@@ -29,7 +29,7 @@
 
 #include "includes.h"
 
-RCSID("$Id: bsd-cygwin_util.c,v 1.12 2004/04/18 11:15:45 djm Exp $");
+RCSID("$Id: bsd-cygwin_util.c,v 1.13 2004/08/30 10:42:08 dtucker Exp $");
 
 #ifdef HAVE_CYGWIN
 
@@ -38,6 +38,7 @@ RCSID("$Id: bsd-cygwin_util.c,v 1.12 2004/04/18 11:15:45 djm Exp $");
 #include <sys/utsname.h>
 #include <sys/vfs.h>
 #include <windows.h>
+#include "xmalloc.h"
 #define is_winnt       (GetVersion() < 0x80000000)
 
 #define ntsec_on(c)	((c) && strstr((c),"ntsec") && !strstr((c),"nontsec"))
@@ -96,7 +97,6 @@ has_capability(int what)
 	 */
 	if (!inited) {
 		struct utsname uts;
-		char *c;
 		
 		if (!uname(&uts)) {
 			int major_high = 0, major_low = 0, minor = 0;
@@ -236,4 +236,54 @@ register_9x_service(void)
 	RegisterServiceProcess(0, 1);
 }
 
+#define NL(x) x, (sizeof (x) - 1)
+#define WENV_SIZ (sizeof (wenv_arr) / sizeof (wenv_arr[0]))
+
+static struct wenv {
+	const char *name;
+	size_t namelen;
+} wenv_arr[] = {
+	{ NL("ALLUSERSPROFILE=") },
+	{ NL("COMMONPROGRAMFILES=") },
+	{ NL("COMPUTERNAME=") },
+	{ NL("COMSPEC=") },
+	{ NL("NUMBER_OF_PROCESSORS=") },
+	{ NL("OS=") },
+	{ NL("PATH=") },
+	{ NL("PATHEXT=") },
+	{ NL("PROCESSOR_ARCHITECTURE=") },
+	{ NL("PROCESSOR_IDENTIFIER=") },
+	{ NL("PROCESSOR_LEVEL=") },
+	{ NL("PROCESSOR_REVISION=") },
+	{ NL("PROGRAMFILES=") },
+	{ NL("SYSTEMDRIVE=") },
+	{ NL("SYSTEMROOT=") },
+	{ NL("TMP=") },
+	{ NL("TEMP=") },
+	{ NL("WINDIR=") },
+};
+
+char **
+fetch_windows_environment(void)
+{
+	char **e, **p;
+	int i, idx = 0;
+
+	p = xmalloc(WENV_SIZ * sizeof(char *));
+	for (e = environ; *e != NULL; ++e) {
+		for (i = 0; i < WENV_SIZ; ++i) {
+			if (!strncmp(*e, wenv_arr[i].name, wenv_arr[i].namelen))
+				p[idx++] = *e;
+		}
+	}
+	p[idx] = NULL;
+	return p;
+}
+
+void
+free_windows_environment(char **p)
+{
+	xfree(p);
+}
+
 #endif /* HAVE_CYGWIN */
diff --git a/openbsd-compat/bsd-cygwin_util.h b/openbsd-compat/bsd-cygwin_util.h
index 5ccb0fba2..6719b8a49 100644
--- a/openbsd-compat/bsd-cygwin_util.h
+++ b/openbsd-compat/bsd-cygwin_util.h
@@ -1,4 +1,4 @@
-/* $Id: bsd-cygwin_util.h,v 1.10 2003/08/07 06:28:16 dtucker Exp $ */
+/* $Id: bsd-cygwin_util.h,v 1.11 2004/08/30 10:42:08 dtucker Exp $ */
 
 /*
  * Copyright (c) 2000, 2001, Corinna Vinschen <vinschen@cygnus.com>
@@ -46,6 +46,8 @@ int binary_pipe(int fd[2]);
 int check_nt_auth(int, struct passwd *);
 int check_ntsec(const char *);
 void register_9x_service(void);
+char **fetch_windows_environment(void);
+void free_windows_environment(char **);
 
 #define open binary_open
 #define pipe binary_pipe
diff --git a/session.c b/session.c
index ee4008acf..89e1ec892 100644
--- a/session.c
+++ b/session.c
@@ -979,7 +979,13 @@ do_setup_env(Session *s, const char *shell)
 	 * The Windows environment contains some setting which are
 	 * important for a running system. They must not be dropped.
 	 */
-	copy_environment(environ, &env, &envsize);
+	{
+		char **p;
+
+		p = fetch_windows_environment();
+		copy_environment(p, &env, &envsize);
+		free_windows_environment(p);
+	}
 #endif
 
 #ifdef GSSAPI