UNIX-pc vi modeline disable patch

Sun Nov 27 17:50:13 AEST 1988

The following patch can be applied to the UNIX-pc version of vi (will also
affect all things linked to vi) to disable the vi modeline feature.

PLEASE READ THE README FILE BEFORE APPLYING THIS PATCH!  ALSO READ THE
DISCLAIMER CONTAINED AT THE BEGINNING OF THE SOURCE PROGRAM!

Gil Kloepfer, Jr.          U-Net: {decuac,boulder,talcott,sbcs}!icus!limbic!gil
ICUS Software Systems      Voice: (516) 968-6860 [H]   (516) 746-2350 x219 [W]
P.O. Box 1                 Internet:  gil at icus.islp.ny.us
Islip Terrace, NY  11752   "Life's a ...  well, you know..."

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#		"End of shell archive."
# Contents:  Makefile README vifix.c
# Wrapped by gil at limbic on Sun Nov 27 02:44:47 1988
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f Makefile -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"Makefile\"
else
echo shar: Extracting \"Makefile\" \(399 characters\)
sed "s/^X//" >Makefile <<'END_OF_Makefile'
X#
X# Makefile to compile vifix.c  (vi modeline elimination)
X# (c)1988 ICUS Software Systems     UUCP:  ...icus!software
X#
XCFLAGS=-v -O
XLDFLAGS=-s
XLIBS=/lib/crt0s.o /lib/shlib.ifile
X#
Xvifix:  vifix.o
X	@echo "Loading ..."
X	$(LD) $(LDFLAGS) -o vifix vifix.o $(LIBS) 
X	@echo "Copying /usr/bin/vi to current directory ..."
X	@cp /usr/bin/vi .
X	@vifix
X	@echo "Save old version, and copy \"vi\" to /usr/bin"
END_OF_Makefile
if test 399 -ne `wc -c <Makefile`; then
    echo shar: \"Makefile\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f README -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"README\"
else
echo shar: Extracting \"README\" \(1269 characters\)
sed "s/^X//" >README <<'END_OF_README'
Xvi/ex modeline feature disable patch ... Gil Kloepfer, ICUS Software Systems
X----------------------------------------------------------------------------
X
XThis program and its Makefile are used to disable the modeline feature in
Xvi/ex which can inadvertantly allow malicious users to send "infected" files
Xto privileged users and disrupt system activities.
X
XThe patch is applied by executing the makefile ($ make).  The makefile will
Xcompile the patch program, copy the vi editor executable file into your
Xcurrent directory and apply the patch to this copy.  You should then make
Xa copy of the original vi editor, and copy the new one over the old one.
X
X		# make
X		# cp /usr/bin/vi /usr/bin/vi.OLD
X		# cp ./vi /usr/bin/vi
X
XThanks to Lenny Tropiano for the makefile.  Those who feel more comfortable
Xapplying the patch without any makefiles, the procedure is as follows:
X
X		# cc -v -o vifix vifix.c
X		# cd /usr/bin
X		# cp vi vi.OLD
X		# whatever-path/vifix
X
XThe vifix program will inform you if the version of vi you are fixing is
Xsupported by the patch program.  Note that this message will also appear if
Xthe patch is already applied.
X
XAny further questions about the patch can be directed to Gil Kloepfer
Xat ...icus!limbic!gil, gil at limbic.UUCP, or gil at icus.islp.ny.us
END_OF_README
if test 1269 -ne `wc -c <README`; then
    echo shar: \"README\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f vifix.c -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"vifix.c\"
else
echo shar: Extracting \"vifix.c\" \(1745 characters\)
sed "s/^X//" >vifix.c <<'END_OF_vifix.c'
X/*
X * vifix.c
X *
X * Program to patch UNIX-pc (3B1) "vi" editor so that the modeline
X * function is disabled.
X *
X * By Gil Kloepfer, Jr., Lenny Tropiano  ICUS Software Systems   11/26/1988
X * Permission granted to redistribute without profit in the public domain
X * only.  This header must remain in-tact as is.  This program carries
X * no warranties, express or implied, and all consequences resulting from
X * the application of this patch are the sole responsibility of the user.
X *
X * Patch transforms the following byte pattern in vi -- this comment here
X * so that this program could be adapted to a newer version of vi:
X *
X * From:
X *     377 374 112 200 147 000 000 174 040
X * To:
X *     377 374 116 161 140 000 000 174 040
X *
X * This effectively skips over the modeline checking code in the editor.
X */
X
X#define	NONCRYPT	26202L
X#define	CRYPT		26343L
X
X#include <fcntl.h>
X
Xmain()
X{
X	char	buffer[3];
X	int	fd;
X
X	if ((fd=open("vi",O_RDWR)) < 0) {
X		perror("open");
X		exit(1);
X	}
X
X	lseek(fd,NONCRYPT,0);		/* check for ENHANCED EDITOR version */
X	if (read(fd,buffer,3) != 3) {
X		perror("read");
X		exit(1);
X	}
X
X	if ((int)buffer[0] != 0112 &&
X	    (int)buffer[1] != 0200 &&
X	    (int)buffer[2] != 0147) {
X		lseek(fd,CRYPT,0);	/* check for ENCRYPTION SET version */
X		if (read(fd,buffer,3) != 3) {
X			perror("read");
X			exit(1);
X		}
X		if ((int)buffer[0] != 0112 &&
X	            (int)buffer[1] != 0200 &&
X	            (int)buffer[2] != 0147) {
X			printf("Version of vi not valid for this patch.\n");
X			exit(1);
X		}
X	}
X
X	lseek(fd,-3L,1);		/* back up pointer 3 bytes */
X	buffer[0]=(char)0116;
X	buffer[1]=(char)0161;
X	buffer[2]=(char)0140;
X	write(fd,buffer,3);
X
X	close(fd);
X	printf("vi modeline elimination patch successfully applied\n");
X	exit(0);
X}
END_OF_vifix.c
if test 1745 -ne `wc -c <vifix.c`; then
    echo shar: \"vifix.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
echo shar: End of shell archive.
exit 0