Shadow Login Suite, version 3 (part 7 of 8)

[John F Haugh II]

#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create:
#	groupio.c
#	shadowio.c
#	sgroupio.c
# This archive created: Sun Mar  3 13:27:37 1991
# By:	John F Haugh II (River Parishes Programming, Austin TX)
export PATH; PATH=/bin:/usr/bin:$PATH
echo shar: "extracting 'groupio.c'" '(10707 characters)'
if test -f 'groupio.c'
then
	echo shar: "will not over-write existing file 'groupio.c'"
else
sed 's/^X//' << \SHAR_EOF > 'groupio.c'
X/*
X * Copyright 1990, John F. Haugh II
X * An unpublished work.
X * All rights reserved.
X *
X * Use, duplication, and disclosure prohibited without
X * the express written permission of the author.
X *
X *	This file implements a transaction oriented group database
X *	library.  The group file is updated one entry at a time.
X *	After each transaction the file must be logically closed and
X *	transferred to the existing group file.  The sequence of
X *	events is
X *
X *	gr_lock				-- lock group file
X *	gr_open				-- logically open group file
X *	while transaction to process
X *		gr_(locate,update,remove) -- perform transaction
X *	done
X *	gr_close			-- commit transactions
X *	gr_unlock			-- remove group lock
X */
X
X#include <sys/stat.h>
X#include <fcntl.h>
X#include <errno.h>
X#include <grp.h>
X#include <stdio.h>
X#ifdef	BSD
X#include <strings.h>
X#else
X#include <string.h>
X#endif
X
X#ifndef	lint
Xstatic	char	sccsid[] = "@(#)groupio.c	3.6 15:59:12 12/9/90";
X#endif
X
Xstatic	int	islocked;
Xstatic	int	isopen;
Xstatic	int	open_modes;
Xstatic	FILE	*grfp;
X
Xstruct	gr_file_entry {
X	char	*grf_line;
X	int	grf_changed;
X	struct	group	*grf_entry;
X	struct	gr_file_entry *grf_next;
X};
X
Xstatic	struct	gr_file_entry	*grf_head;
Xstatic	struct	gr_file_entry	*grf_tail;
Xstatic	struct	gr_file_entry	*grf_cursor;
Xstatic	int	gr_changed;
Xstatic	int	lock_pid;
X
X#define	GR_LOCK	"/etc/group.lock"
X#define	GR_TEMP "/etc/grp.%d"
X#define	GROUP	"/etc/group"
X
Xstatic	char	gr_filename[BUFSIZ] = GROUP;
X
Xextern	char	*strdup();
Xextern	struct	group	*sgetgrent();
X
X/*
X * gr_dup - duplicate a group file entry
X *
X *	gr_dup() accepts a pointer to a group file entry and
X *	returns a pointer to a group file entry in allocated
X *	memory.
X */
X
Xstatic struct group *
Xgr_dup (grent)
Xstruct	group	*grent;
X{
X	struct	group	*gr;
X	int	i;
X
X	if (! (gr = (struct group *) malloc (sizeof *gr)))
X		return 0;
X
X	if ((gr->gr_name = strdup (grent->gr_name)) == 0 ||
X			(gr->gr_passwd = strdup (grent->gr_passwd)) == 0)
X		return 0;
X
X	for (i = 0;grent->gr_mem[i];i++)
X		;
X
X	gr->gr_mem = (char **) malloc (sizeof (char *) * (i + 1));
X	for (i = 0;grent->gr_mem[i];i++)
X		if (! (gr->gr_mem[i] = strdup (grent->gr_mem[i])))
X			return 0;
X
X	gr->gr_mem[i] = 0;
X	gr->gr_gid = grent->gr_gid;
X
X	return gr;
X}
X
X/*
X * gr_free - free a dynamically allocated group file entry
X *
X *	gr_free() frees up the memory which was allocated for the
X *	pointed to entry.
X */
X
Xstatic void
Xgr_free (grent)
Xstruct	group	*grent;
X{
X	int	i;
X
X	free (grent->gr_name);
X	free (grent->gr_passwd);
X
X	for (i = 0;grent->gr_mem[i];i++)
X		free (grent->gr_mem[i]);
X
X	free (grent->gr_mem);
X}
X
X/*
X * gr_name - change the name of the group file
X */
X
Xint
Xgr_name (name)
Xchar	*name;
X{
X	if (isopen || strlen (name) > (BUFSIZ-10))
X		return -1;
X
X	strcpy (gr_filename, name);
X	return 0;
X}
X
X/*
X * gr_lock - lock a group file
X *
X *	gr_lock() encapsulates the lock operation.  it returns
X *	TRUE or FALSE depending on the group file being
X *	properly locked.  the lock is set by creating a semaphore
X *	file, GR_LOCK.
X */
X
Xint
Xgr_lock ()
X{
X	int	fd;
X	int	pid;
X	int	len;
X	char	file[BUFSIZ];
X	char	buf[32];
X	struct	stat	sb;
X
X	if (islocked)
X		return 1;
X
X	if (strcmp (gr_filename, GROUP) != 0)
X		return 0;
X
X	/*
X	 * Create a lock file which can be switched into place
X	 */
X
X	sprintf (file, GR_TEMP, lock_pid = getpid ());
X	if ((fd = open (file, O_CREAT|O_EXCL|O_WRONLY, 0600)) == -1)
X		return 0;
X
X	sprintf (buf, "%d", lock_pid);
X	if (write (fd, buf, strlen (buf) + 1) != strlen (buf) + 1) {
X		(void) close (fd);
X		(void) unlink (file);
X		return 0;
X	}
X	close (fd);
X
X	/*
X	 * Simple case first -
X	 *	Link fails (in a sane environment ...) if the target
X	 *	exists already.  So we try to switch in a new lock
X	 *	file.  If that succeeds, we assume we have the only
X	 *	valid lock.  Needs work for NFS where this assumption
X	 *	may not hold.  The simple hack is to check the link
X	 *	count on the source file, which should be 2 iff the
X	 *	link =really= worked.
X	 */
X
X	if (link (file, GR_LOCK) == 0) {
X		if (stat (file, &sb) != 0)
X			return 0;
X
X		if (sb.st_nlink != 2)
X			return 0;
X
X		(void) unlink (file);
X		islocked = 1;
X		return 1;
X	}
X
X	/*
X	 * Invalid lock test -
X	 *	Open the lock file and see if the lock is valid.
X	 *	The PID of the lock file is checked, and if the PID
X	 *	is not valid, the lock file is removed.  If the unlink
X	 *	of the lock file fails, it should mean that someone
X	 *	else is executing this code.  They will get success,
X	 *	and we will fail.
X	 */
X
X	if ((fd = open (GR_LOCK, O_RDWR)) == -1 ||
X			(len = read (fd, buf, BUFSIZ)) <= 0) {
X		errno = EINVAL;
X		return 0;
X	}
X	buf[len] = '\0';
X	if ((pid = strtol (buf, (char **) 0, 10)) == 0) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (kill (pid, 0) == 0)  {
X		errno = EEXIST;
X		return 0;
X	}
X	if (unlink (GR_LOCK)) {
X		(void) close (fd);
X		(void) unlink (file);
X
X		return 0;
X	}
X
X	/*
X	 * Re-try lock -
X	 *	The invalid lock has now been removed and I should
X	 *	be able to acquire a lock for myself just fine.  If
X	 *	this fails there will be no retry.  The link count
X	 *	test here makes certain someone executing the previous
X	 *	block of code didn't just remove the lock we just
X	 *	linked to.
X	 */
X
X	if (link (file, GR_LOCK) == 0) {
X		if (stat (file, &sb) != 0)
X			return 0;
X
X		if (sb.st_nlink != 2)
X			return 0;
X
X		(void) unlink (file);
X		islocked = 1;
X		return 1;
X	}
X	(void) unlink (file);
X	return 0;
X}
X
X/*
X * gr_unlock - logically unlock a group file
X *
X *	gr_unlock() removes the lock which was set by an earlier
X *	invocation of gr_lock().
X */
X
Xint
Xgr_unlock ()
X{
X	if (isopen) {
X		open_modes = O_RDONLY;
X		if (! gr_close ())
X			return 0;
X	}
X	if (islocked) {
X		islocked = 0;
X		if (lock_pid != getpid ())
X			return 0;
X
X		(void) unlink (GR_LOCK);
X		return 1;
X	}
X	return 0;
X}
X
X/*
X * gr_open - open a group file
X *
X *	gr_open() encapsulates the open operation.  it returns
X *	TRUE or FALSE depending on the group file being
X *	properly opened.
X */
X
Xint
Xgr_open (mode)
Xint	mode;
X{
X	char	buf[8192];
X	char	*cp;
X	struct	gr_file_entry	*grf;
X	struct	group	*grent;
X
X	if (isopen || (mode != O_RDONLY && mode != O_RDWR))
X		return 0;
X
X	if (mode != O_RDONLY && ! islocked &&
X			strcmp (gr_filename, GROUP) == 0)
X		return 0;
X
X	if ((grfp = fopen (gr_filename, mode == O_RDONLY ? "r":"r+")) == 0)
X		return 0;
X
X	grf_head = grf_tail = grf_cursor = 0;
X	gr_changed = 0;
X
X	while (fgetsx (buf, sizeof buf, grfp) != (char *) 0) {
X		if (cp = strrchr (buf, '\n'))
X			*cp = '\0';
X
X		if (! (grf = (struct gr_file_entry *) malloc (sizeof *grf)))
X			return 0;
X
X		grf->grf_changed = 0;
X		grf->grf_line = strdup (buf);
X		if ((grent = sgetgrent (buf)) && ! (grent = gr_dup (grent)))
X			return 0;
X
X		grf->grf_entry = grent;
X
X		if (grf_head == 0) {
X			grf_head = grf_tail = grf;
X			grf->grf_next = 0;
X		} else {
X			grf_tail->grf_next = grf;
X			grf->grf_next = 0;
X			grf_tail = grf;
X		}
X	}
X	isopen++;
X	open_modes = mode;
X
X	return 1;
X}
X
X/*
X * gr_close - close the group file
X *
X *	gr_close() outputs any modified group file entries and
X *	frees any allocated memory.
X */
X
Xint
Xgr_close ()
X{
X	char	backup[BUFSIZ];
X	int	fd;
X	int	mask;
X	int	c;
X	int	i;
X	int	errors = 0;
X	FILE	*bkfp;
X	struct	gr_file_entry *grf;
X	struct	gr_file_entry *ogrf;
X
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (islocked && lock_pid != getpid ()) {
X		isopen = 0;
X		islocked = 0;
X		errno = EACCES;
X		return 0;
X	}
X	strcpy (backup, gr_filename);
X	strcat (backup, "-");
X
X	if (open_modes == O_RDWR && gr_changed) {
X		mask = umask (0222);
X		if ((bkfp = fopen (backup, "w")) == 0) {
X			umask (mask);
X			return 0;
X		}
X		umask (mask);
X
X		rewind (grfp);
X		while ((c = getc (grfp)) != EOF) {
X			if (putc (c, bkfp) == EOF) {
X				fclose (bkfp);
X				return 0;
X			}
X		}
X		if (fclose (bkfp))
X			return 0;
X
X		isopen = 0;
X		(void) fclose (grfp);
X
X		mask = umask (0222);
X		if (! (grfp = fopen (gr_filename, "w"))) {
X			umask (mask);
X			return 0;
X		}
X		umask (mask);
X
X		for (grf = grf_head;! errors && grf;grf = grf->grf_next) {
X			if (grf->grf_changed) {
X				if (putgrent (grf->grf_entry, grfp))
X					errors++;
X			} else {
X				if (fputsx (grf->grf_line, grfp))
X					errors++;
X
X				if (putc ('\n', grfp) == EOF)
X					errors++;
X			}
X		}
X		if (fflush (grfp))
X			errors++;
X
X		if (errors) {
X			unlink (gr_filename);
X			link (backup, gr_filename);
X			unlink (backup);
X			return 0;
X		}
X	}
X	if (fclose (grfp))
X		return 0;
X
X	grfp = 0;
X
X	while (grf_head != 0) {
X		grf = grf_head;
X		grf_head = grf->grf_next;
X
X		if (grf->grf_entry) {
X			gr_free (grf->grf_entry);
X			free (grf->grf_entry);
X		}
X		if (grf->grf_line)
X			free (grf->grf_line);
X
X		free (grf);
X	}
X	grf_tail = 0;
X	return 1;
X}
X
Xint
Xgr_update (grent)
Xstruct	group	*grent;
X{
X	struct	gr_file_entry	*grf;
X	struct	group	*ngr;
X
X	if (! isopen || open_modes == O_RDONLY) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (grf = grf_head;grf != 0;grf = grf->grf_next) {
X		if (grf->grf_entry == 0)
X			continue;
X
X		if (strcmp (grent->gr_name, grf->grf_entry->gr_name) != 0)
X			continue;
X
X		if (! (ngr = gr_dup (grent)))
X			return 0;
X		else {
X			gr_free (grf->grf_entry);
X			*(grf->grf_entry) = *ngr;
X		}
X		grf->grf_changed = 1;
X		grf_cursor = grf;
X		return gr_changed = 1;
X	}
X	grf = (struct gr_file_entry *) malloc (sizeof *grf);
X	if (! (grf->grf_entry = gr_dup (grent)))
X		return 0;
X
X	grf->grf_changed = 1;
X	grf->grf_next = 0;
X	grf->grf_line = 0;
X
X	if (grf_tail)
X		grf_tail->grf_next = grf;
X
X	if (! grf_head)
X		grf_head = grf;
X
X	grf_tail = grf;
X
X	return gr_changed = 1;
X}
X
Xint
Xgr_remove (name)
Xchar	*name;
X{
X	struct	gr_file_entry	*grf;
X	struct	gr_file_entry	*ogrf;
X
X	if (! isopen || open_modes == O_RDONLY) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (ogrf = 0, grf = grf_head;grf != 0;
X			ogrf = grf, grf = grf->grf_next) {
X		if (! grf->grf_entry)
X			continue;
X
X		if (strcmp (name, grf->grf_entry->gr_name) != 0)
X			continue;
X
X		if (grf == grf_cursor)
X			grf_cursor = ogrf;
X
X		if (ogrf != 0)
X			ogrf->grf_next = grf->grf_next;
X		else
X			grf_head = grf->grf_next;
X
X		if (grf == grf_tail)
X			grf_tail = ogrf;
X
X		return gr_changed = 1;
X	}
X	errno = ENOENT;
X	return 0;
X}
X
Xstruct group *
Xgr_locate (name)
Xchar	*name;
X{
X	struct	gr_file_entry	*grf;
X
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (grf = grf_head;grf != 0;grf = grf->grf_next) {
X		if (grf->grf_entry == 0)
X			continue;
X
X		if (strcmp (name, grf->grf_entry->gr_name) == 0) {
X			grf_cursor = grf;
X			return grf->grf_entry;
X		}
X	}
X	errno = ENOENT;
X	return 0;
X}
X
Xint
Xgr_rewind ()
X{
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	grf_cursor = 0;
X	return 1;
X}
X
Xstruct group *
Xgr_next ()
X{
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (grf_cursor == 0)
X		grf_cursor = grf_head;
X	else
X		grf_cursor = grf_cursor->grf_next;
X
X	while (grf_cursor) {
X		if (grf_cursor->grf_entry)
X			return grf_cursor->grf_entry;
X
X		grf_cursor = grf_cursor->grf_next;
X	}
X	return 0;
X}
SHAR_EOF
if test 10707 -ne "`wc -c < 'groupio.c'`"
then
	echo shar: "error transmitting 'groupio.c'" '(should have been 10707 characters)'
fi
fi
echo shar: "extracting 'shadowio.c'" '(10637 characters)'
if test -f 'shadowio.c'
then
	echo shar: "will not over-write existing file 'shadowio.c'"
else
sed 's/^X//' << \SHAR_EOF > 'shadowio.c'
X/*
X * Copyright 1990, John F. Haugh II
X * All rights reserved.
X *
X * Use, duplication, and disclosure prohibited without
X * the express written permission of the author.
X *
X *	This file implements a transaction oriented password database
X *	library.  The password file is updated one entry at a time.
X *	After each transaction the file must be logically closed and
X *	transferred to the existing password file.  The sequence of
X *	events is
X *
X *	spw_lock			-- lock shadow file
X *	spw_open			-- logically open shadow file
X *	while transaction to process
X *		spw_(locate,update,remove) -- perform transaction
X *	done
X *	spw_close			-- commit transactions
X *	spw_unlock			-- remove shadow lock
X */
X
X#ifndef	lint
Xstatic	char	sccsid[] = "@(#)shadowio.c	3.4	07:54:20	12/1/90";
X#endif
X
X#include <sys/stat.h>
X#include <fcntl.h>
X#include <errno.h>
X#include <stdio.h>
X#ifdef	BSD
X#include <strings.h>
X#else
X#include <string.h>
X#endif
X#include "shadow.h"
X
Xstatic	int	islocked;
Xstatic	int	isopen;
Xstatic	int	open_modes;
Xstatic	FILE	*spwfp;
X
Xstruct	spw_file_entry {
X	char	*spwf_line;
X	int	spwf_changed;
X	struct	spwd	*spwf_entry;
X	struct	spw_file_entry *spwf_next;
X};
X
Xstatic	struct	spw_file_entry	*spwf_head;
Xstatic	struct	spw_file_entry	*spwf_tail;
Xstatic	struct	spw_file_entry	*spwf_cursor;
Xstatic	int	sp_changed;
Xstatic	int	lock_pid;
X
X#define	SPW_LOCK	"/etc/shadow.lock"
X#define	SPW_TEMP	"/etc/spwd.%d"
X#define	SHADOW		"/etc/shadow"
X
Xstatic	char	spw_filename[BUFSIZ] = SHADOW;
X
Xextern	char	*strdup();
Xextern	struct	spwd	*sgetspent();
X
X/*
X * spw_dup - duplicate a shadow file entry
X *
X *	spw_dup() accepts a pointer to a shadow file entry and
X *	returns a pointer to a shadow file entry in allocated
X *	memory.
X */
X
Xstatic struct spwd *
Xspw_dup (spwd)
Xstruct	spwd	*spwd;
X{
X	struct	spwd	*spw;
X
X	if (! (spw = (struct spwd *) malloc (sizeof *spw)))
X		return 0;
X
X	*spw = *spwd;
X	if ((spw->sp_namp = strdup (spwd->sp_namp)) == 0 ||
X			(spw->sp_pwdp = strdup (spwd->sp_pwdp)) == 0)
X		return 0;
X
X	return spw;
X}
X
X/*
X * spw_free - free a dynamically allocated shadow file entry
X *
X *	spw_free() frees up the memory which was allocated for the
X *	pointed to entry.
X */
X
Xstatic void
Xspw_free (spwd)
Xstruct	spwd	*spwd;
X{
X	free (spwd->sp_namp);
X	free (spwd->sp_pwdp);
X}
X
X/*
X * spw_name - change the name of the shadow password file
X */
X
Xint
Xspw_name (name)
Xchar	*name;
X{
X	if (isopen || strlen (name) > (BUFSIZ-10))
X		return -1;
X
X	strcpy (spw_filename, name);
X	return 0;
X}
X
X/*
X * spw_lock - lock a password file
X *
X *	spw_lock() encapsulates the lock operation.  it returns
X *	TRUE or FALSE depending on the password file being
X *	properly locked.  the lock is set by creating a semaphore
X *	file, SPW_LOCK.
X */
X
Xint
Xspw_lock ()
X{
X	int	fd;
X	int	pid;
X	int	len;
X	char	file[BUFSIZ];
X	char	buf[32];
X	struct	stat	sb;
X
X	if (islocked)
X		return 1;
X
X	if (strcmp (spw_filename, SHADOW) != 0)
X		return 0;
X
X	/*
X	 * Create a lock file which can be switched into place
X	 */
X
X	sprintf (file, SPW_TEMP, lock_pid = getpid ());
X	if ((fd = open (file, O_CREAT|O_EXCL|O_WRONLY, 0600)) == -1)
X		return 0;
X
X	sprintf (buf, "%d", lock_pid);
X	if (write (fd, buf, strlen (buf) + 1) != strlen (buf) + 1) {
X		(void) close (fd);
X		(void) unlink (file);
X		return 0;
X	}
X	close (fd);
X
X	/*
X	 * Simple case first -
X	 *	Link fails (in a sane environment ...) if the target
X	 *	exists already.  So we try to switch in a new lock
X	 *	file.  If that succeeds, we assume we have the only
X	 *	valid lock.  Needs work for NFS where this assumption
X	 *	may not hold.  The simple hack is to check the link
X	 *	count on the source file, which should be 2 iff the
X	 *	link =really= worked.
X	 */
X
X	if (link (file, SPW_LOCK) == 0) {
X		if (stat (file, &sb) != 0)
X			return 0;
X
X		if (sb.st_nlink != 2)
X			return 0;
X
X		(void) unlink (file);
X		islocked = 1;
X		return 1;
X	}
X
X	/*
X	 * Invalid lock test -
X	 *	Open the lock file and see if the lock is valid.
X	 *	The PID of the lock file is checked, and if the PID
X	 *	is not valid, the lock file is removed.  If the unlink
X	 *	of the lock file fails, it should mean that someone
X	 *	else is executing this code.  They will get success,
X	 *	and we will fail.
X	 */
X
X	if ((fd = open (SPW_LOCK, O_RDWR)) == -1 ||
X			(len = read (fd, buf, BUFSIZ)) <= 0) {
X		errno = EINVAL;
X		return 0;
X	}
X	buf[len] = '\0';
X	if ((pid = strtol (buf, (char **) 0, 10)) == 0) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (kill (pid, 0) == 0)  {
X		errno = EEXIST;
X		return 0;
X	}
X	if (unlink (SPW_LOCK)) {
X		(void) close (fd);
X		(void) unlink (file);
X
X		return 0;
X	}
X
X	/*
X	 * Re-try lock -
X	 *	The invalid lock has now been removed and I should
X	 *	be able to acquire a lock for myself just fine.  If
X	 *	this fails there will be no retry.  The link count
X	 *	test here makes certain someone executing the previous
X	 *	block of code didn't just remove the lock we just
X	 *	linked to.
X	 */
X
X	if (link (file, SPW_LOCK) == 0) {
X		if (stat (file, &sb) != 0)
X			return 0;
X
X		if (sb.st_nlink != 2)
X			return 0;
X
X		(void) unlink (file);
X		islocked = 1;
X		return 1;
X	}
X	(void) unlink (file);
X	return 0;
X}
X
X/*
X * spw_unlock - logically unlock a shadow file
X *
X *	spw_unlock() removes the lock which was set by an earlier
X *	invocation of spw_lock().
X */
X
Xint
Xspw_unlock ()
X{
X	if (isopen) {
X		open_modes = O_RDONLY;
X		if (! spw_close ())
X			return 0;
X	}
X  	if (islocked) {
X  		islocked = 0;
X		if (lock_pid != getpid ())
X			return 0;
X
X		(void) unlink (SPW_LOCK);
X		return 1;
X	}
X	return 0;
X}
X
X/*
X * spw_open - open a password file
X *
X *	spw_open() encapsulates the open operation.  it returns
X *	TRUE or FALSE depending on the shadow file being
X *	properly opened.
X */
X
Xint
Xspw_open (mode)
Xint	mode;
X{
X	char	buf[BUFSIZ];
X	char	*cp;
X	struct	spw_file_entry	*spwf;
X	struct	spwd	*spwd;
X
X	if (isopen || (mode != O_RDONLY && mode != O_RDWR))
X		return 0;
X
X	if (mode != O_RDONLY && ! islocked &&
X			strcmp (spw_filename, SHADOW) == 0)
X		return 0;
X
X	if ((spwfp = fopen (spw_filename, mode == O_RDONLY ? "r":"r+")) == 0)
X		return 0;
X
X	spwf_head = spwf_tail = spwf_cursor = 0;
X	sp_changed = 0;
X
X	while (fgets (buf, sizeof buf, spwfp) != (char *) 0) {
X		if (cp = strrchr (buf, '\n'))
X			*cp = '\0';
X
X		if (! (spwf = (struct spw_file_entry *) malloc (sizeof *spwf)))
X			return 0;
X
X		spwf->spwf_changed = 0;
X		spwf->spwf_line = strdup (buf);
X		if ((spwd = sgetspent (buf)) && ! (spwd = spw_dup (spwd)))
X			return 0;
X
X		spwf->spwf_entry = spwd;
X
X		if (spwf_head == 0) {
X			spwf_head = spwf_tail = spwf;
X			spwf->spwf_next = 0;
X		} else {
X			spwf_tail->spwf_next = spwf;
X			spwf->spwf_next = 0;
X			spwf_tail = spwf;
X		}
X	}
X	isopen++;
X	open_modes = mode;
X
X	return 1;
X}
X
X/*
X * spw_close - close the password file
X *
X *	spw_close() outputs any modified password file entries and
X *	frees any allocated memory.
X */
X
Xint
Xspw_close ()
X{
X	char	backup[BUFSIZ];
X	int	fd;
X	int	mask;
X	int	c;
X	int	i;
X	int	errors = 0;
X	FILE	*bkfp;
X	struct	spw_file_entry *spwf;
X	struct	spw_file_entry *ospwf;
X
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (islocked && lock_pid != getpid ()) {
X		isopen = 0;
X		islocked = 0;
X		errno = EACCES;
X		return 0;
X	}
X	strcpy (backup, spw_filename);
X	strcat (backup, "-");
X
X	if (open_modes == O_RDWR && sp_changed) {
X		mask = umask (077);
X		if ((bkfp = fopen (backup, "w")) == 0) {
X			umask (mask);
X			return 0;
X		}
X		umask (mask);
X
X		rewind (spwfp);
X		while ((c = getc (spwfp)) != EOF) {
X			if (putc (c, bkfp) == EOF) {
X				fclose (bkfp);
X				return 0;
X			}
X		}
X		if (fclose (bkfp))
X			return 0;
X
X		isopen = 0;
X		(void) fclose (spwfp);
X
X		mask = umask (077);
X		if (! (spwfp = fopen (spw_filename, "w"))) {
X			umask (mask);
X			return 0;
X		}
X		umask (mask);
X
X		for (spwf = spwf_head;errors == 0 && spwf;
X						spwf = spwf->spwf_next) {
X			if (spwf->spwf_changed) {
X				if (putspent (spwf->spwf_entry, spwfp))
X					errors++;
X			} else {
X				if (fputs (spwf->spwf_line, spwfp) == EOF)
X					errors++;
X				if (putc ('\n', spwfp) == EOF)
X					errors++;
X			}
X		}
X		if (fflush (spwfp))
X			errors++;
X
X		if (errors) {
X			unlink (spw_filename);
X			link (backup, spw_filename);
X			unlink (backup);
X			return 0;
X		}
X	}
X	if (fclose (spwfp))
X		return 0;
X
X	spwfp = 0;
X
X	while (spwf_head != 0) {
X		spwf = spwf_head;
X		spwf_head = spwf->spwf_next;
X
X		if (spwf->spwf_entry) {
X			spw_free (spwf->spwf_entry);
X			free (spwf->spwf_entry);
X		}
X		if (spwf->spwf_line)
X			free (spwf->spwf_line);
X
X		free (spwf);
X	}
X	spwf_tail = 0;
X	return 1;
X}
X
Xint
Xspw_update (spwd)
Xstruct	spwd	*spwd;
X{
X	struct	spw_file_entry	*spwf;
X	struct	spwd	*nspwd;
X
X	if (! isopen || open_modes == O_RDONLY) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (spwf = spwf_head;spwf != 0;spwf = spwf->spwf_next) {
X		if (spwf->spwf_entry == 0)
X			continue;
X
X		if (strcmp (spwd->sp_namp, spwf->spwf_entry->sp_namp) != 0)
X			continue;
X
X		if (! (nspwd = spw_dup (spwd)))
X			return 0;
X		else {
X			spw_free (spwf->spwf_entry);
X			*(spwf->spwf_entry) = *nspwd;
X		}
X		spwf->spwf_changed = 1;
X		spwf_cursor = spwf;
X		return sp_changed = 1;
X	}
X	spwf = (struct spw_file_entry *) malloc (sizeof *spwf);
X	if (! (spwf->spwf_entry = spw_dup (spwd)))
X		return 0;
X
X	spwf->spwf_changed = 1;
X	spwf->spwf_next = 0;
X	spwf->spwf_line = 0;
X
X	if (spwf_tail)
X		spwf_tail->spwf_next = spwf;
X
X	if (! spwf_head)
X		spwf_head = spwf;
X
X	spwf_tail = spwf;
X
X	return sp_changed = 1;
X}
X
Xint
Xspw_remove (name)
Xchar	*name;
X{
X	struct	spw_file_entry	*spwf;
X	struct	spw_file_entry	*ospwf;
X
X	if (! isopen || open_modes == O_RDONLY) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (ospwf = 0, spwf = spwf_head;spwf != 0;
X			ospwf = spwf, spwf = spwf->spwf_next) {
X		if (! spwf->spwf_entry)
X			continue;
X
X		if (strcmp (name, spwf->spwf_entry->sp_namp) != 0)
X			continue;
X
X		if (spwf == spwf_cursor)
X			spwf_cursor = ospwf;
X
X		if (ospwf != 0)
X			ospwf->spwf_next = spwf->spwf_next;
X		else
X			spwf_head = spwf->spwf_next;
X
X		if (spwf == spwf_tail)
X			spwf_tail = ospwf;
X
X		return sp_changed = 1;
X	}
X	errno = ENOENT;
X	return 0;
X}
X
Xstruct spwd *
Xspw_locate (name)
Xchar	*name;
X{
X	struct	spw_file_entry	*spwf;
X
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (spwf = spwf_head;spwf != 0;spwf = spwf->spwf_next) {
X		if (spwf->spwf_entry == 0)
X			continue;
X
X		if (strcmp (name, spwf->spwf_entry->sp_namp) == 0) {
X			spwf_cursor = spwf;
X			return spwf->spwf_entry;
X		}
X	}
X	errno = ENOENT;
X	return 0;
X}
X
Xint
Xspw_rewind ()
X{
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	spwf_cursor = 0;
X	return 1;
X}
X
Xstruct spwd *
Xspw_next ()
X{
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (spwf_cursor == 0)
X		spwf_cursor = spwf_head;
X	else
X		spwf_cursor = spwf_cursor->spwf_next;
X
X	while (spwf_cursor) {
X		if (spwf_cursor->spwf_entry)
X			return spwf_cursor->spwf_entry;
X
X		spwf_cursor = spwf_cursor->spwf_next;
X	}
X	return 0;
X}
SHAR_EOF
if test 10637 -ne "`wc -c < 'shadowio.c'`"
then
	echo shar: "error transmitting 'shadowio.c'" '(should have been 10637 characters)'
fi
fi
echo shar: "extracting 'sgroupio.c'" '(11482 characters)'
if test -f 'sgroupio.c'
then
	echo shar: "will not over-write existing file 'sgroupio.c'"
else
sed 's/^X//' << \SHAR_EOF > 'sgroupio.c'
X/*
X * Copyright 1990, John F. Haugh II
X * All rights reserved.
X *
X * Permission is granted to copy and create derivative works for any
X * non-commercial purpose, provided this copyright notice is preserved
X * in all copies of source code, or included in human readable form
X * and conspicuously displayed on all copies of object code or
X * distribution media.
X *
X *	This file implements a transaction oriented shadow group
X *	database library.  The shadow group file is updated one
X *	entry at a time.  After each transaction the file must be
X *	logically closed and transferred to the existing shadow
X *	group file.  The sequence of events is
X *
X *	sgr_lock			-- lock shadow group file
X *	sgr_open			-- logically open shadow group file
X *	while transaction to process
X *		sgr_(locate,update,remove) -- perform transaction
X *	done
X *	sgr_close			-- commit transactions
X *	sgr_unlock			-- remove shadow group lock
X */
X
X#include <sys/stat.h>
X#include <fcntl.h>
X#include <errno.h>
X#include <stdio.h>
X#ifdef	BSD
X#include <strings.h>
X#define	strchr	index
X#define	strrchr	rindex
X#else
X#include <string.h>
X#endif
X#include "shadow.h"
X
X#ifndef	lint
Xstatic	char	sccsid[] = "@(#)sgroupio.c	3.1	08:13:51	12/14/90";
X#endif
X
Xstatic	int	islocked;
Xstatic	int	isopen;
Xstatic	int	open_modes;
Xstatic	FILE	*sgrfp;
X
Xstruct	sg_file_entry {
X	char	*sgr_line;
X	int	sgr_changed;
X	struct	sgrp	*sgr_entry;
X	struct	sg_file_entry *sgr_next;
X};
X
Xstatic	struct	sg_file_entry	*sgr_head;
Xstatic	struct	sg_file_entry	*sgr_tail;
Xstatic	struct	sg_file_entry	*sgr_cursor;
Xstatic	int	sgr_changed;
Xstatic	int	lock_pid;
X
X#define	SG_LOCK	"/etc/gshadow.lock"
X#define	GR_TEMP "/etc/gshadow.%d"
X#define	SGROUP	"/etc/gshadow"
X
Xstatic	char	sg_filename[BUFSIZ] = SGROUP;
X
Xextern	char	*strdup();
Xextern	struct	sgrp	*sgetgsent();
Xextern	char	*fgetsx();
X
X/*
X * sgr_dup - duplicate a shadow group file entry
X *
X *	sgr_dup() accepts a pointer to a shadow group file entry and
X *	returns a pointer to a shadow group file entry in allocated memory.
X */
X
Xstatic struct sgrp *
Xsgr_dup (sgrent)
Xstruct	sgrp	*sgrent;
X{
X	struct	sgrp	*sgr;
X	int	i;
X
X	if (! (sgr = (struct sgrp *) malloc (sizeof *sgr)))
X		return 0;
X
X	if ((sgr->sg_name = strdup (sgrent->sg_name)) == 0 ||
X			(sgr->sg_passwd = strdup (sgrent->sg_passwd)) == 0)
X		return 0;
X
X	for (i = 0;sgrent->sg_mem[i];i++)
X		;
X
X	sgr->sg_mem = (char **) malloc (sizeof (char *) * (i + 1));
X	for (i = 0;sgrent->sg_mem[i];i++)
X		if (! (sgr->sg_mem[i] = strdup (sgrent->sg_mem[i])))
X			return 0;
X
X	sgr->sg_mem[i] = 0;
X
X	sgr->sg_adm = (char **) malloc (sizeof (char *) * (i + 1));
X	for (i = 0;sgrent->sg_adm[i];i++)
X		if (! (sgr->sg_adm[i] = strdup (sgrent->sg_adm[i])))
X			return 0;
X
X	sgr->sg_adm[i] = 0;
X
X	return sgr;
X}
X
X/*
X * sgr_free - free a dynamically allocated shadow group file entry
X *
X *	sgr_free() frees up the memory which was allocated for the
X *	pointed to entry.
X */
X
Xstatic void
Xsgr_free (sgrent)
Xstruct	sgrp	*sgrent;
X{
X	int	i;
X
X	free (sgrent->sg_name);
X	free (sgrent->sg_passwd);
X
X	for (i = 0;sgrent->sg_mem[i];i++)
X		free (sgrent->sg_mem[i]);
X
X	free (sgrent->sg_mem);
X
X	for (i = 0;sgrent->sg_adm[i];i++)
X		free (sgrent->sg_adm[i]);
X
X	free (sgrent->sg_adm);
X}
X
X/*
X * sgr_name - change the name of the shadow group file
X */
X
Xint
Xsgr_name (name)
Xchar	*name;
X{
X	if (isopen || strlen (name) > (BUFSIZ-10))
X		return -1;
X
X	strcpy (sg_filename, name);
X	return 0;
X}
X
X/*
X * sgr_lock - lock a shadow group file
X *
X *	sgr_lock() encapsulates the lock operation.  it returns
X *	TRUE or FALSE depending on the shadow group file being
X *	properly locked.  the lock is set by creating a semaphore
X *	file, SG_LOCK.
X */
X
Xint
Xsgr_lock ()
X{
X	int	fd;
X	int	pid;
X	int	len;
X	char	file[BUFSIZ];
X	char	buf[32];
X	struct	stat	sb;
X
X	if (islocked)
X		return 1;
X
X	if (strcmp (sg_filename, SGROUP) != 0)
X		return 0;
X
X	/*
X	 * Create a lock file which can be switched into place
X	 */
X
X	sprintf (file, GR_TEMP, lock_pid = getpid ());
X	if ((fd = open (file, O_CREAT|O_EXCL|O_WRONLY, 0600)) == -1)
X		return 0;
X
X	sprintf (buf, "%d", lock_pid);
X	if (write (fd, buf, strlen (buf) + 1) != strlen (buf) + 1) {
X		(void) close (fd);
X		(void) unlink (file);
X		return 0;
X	}
X	close (fd);
X
X	/*
X	 * Simple case first -
X	 *	Link fails (in a sane environment ...) if the target
X	 *	exists already.  So we try to switch in a new lock
X	 *	file.  If that succeeds, we assume we have the only
X	 *	valid lock.  Needs work for NFS where this assumption
X	 *	may not hold.  The simple hack is to check the link
X	 *	count on the source file, which should be 2 iff the
X	 *	link =really= worked.
X	 */
X
X	if (link (file, SG_LOCK) == 0) {
X		if (stat (file, &sb) != 0)
X			return 0;
X
X		if (sb.st_nlink != 2)
X			return 0;
X
X		(void) unlink (file);
X		islocked = 1;
X		return 1;
X	}
X
X	/*
X	 * Invalid lock test -
X	 *	Open the lock file and see if the lock is valid.
X	 *	The PID of the lock file is checked, and if the PID
X	 *	is not valid, the lock file is removed.  If the unlink
X	 *	of the lock file fails, it should mean that someone
X	 *	else is executing this code.  They will get success,
X	 *	and we will fail.
X	 */
X
X	if ((fd = open (SG_LOCK, O_RDWR)) == -1 ||
X			(len = read (fd, buf, BUFSIZ)) <= 0) {
X		errno = EINVAL;
X		return 0;
X	}
X	buf[len] = '\0';
X	if ((pid = strtol (buf, (char **) 0, 10)) == 0) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (kill (pid, 0) == 0)  {
X		errno = EEXIST;
X		return 0;
X	}
X	if (unlink (SG_LOCK)) {
X		(void) close (fd);
X		(void) unlink (file);
X
X		return 0;
X	}
X
X	/*
X	 * Re-try lock -
X	 *	The invalid lock has now been removed and I should
X	 *	be able to acquire a lock for myself just fine.  If
X	 *	this fails there will be no retry.  The link count
X	 *	test here makes certain someone executing the previous
X	 *	block of code didn't just remove the lock we just
X	 *	linked to.
X	 */
X
X	if (link (file, SG_LOCK) == 0) {
X		if (stat (file, &sb) != 0)
X			return 0;
X
X		if (sb.st_nlink != 2)
X			return 0;
X
X		(void) unlink (file);
X		islocked = 1;
X		return 1;
X	}
X	(void) unlink (file);
X	return 0;
X}
X
X/*
X * sgr_unlock - logically unlock a shadow group file
X *
X *	sgr_unlock() removes the lock which was set by an earlier
X *	invocation of sgr_lock().
X */
X
Xint
Xsgr_unlock ()
X{
X	if (isopen) {
X		open_modes = O_RDONLY;
X		if (! sgr_close ())
X			return 0;
X	}
X	if (islocked) {
X		islocked = 0;
X		if (lock_pid != getpid ())
X			return 0;
X
X		(void) unlink (SG_LOCK);
X		return 1;
X	}
X	return 0;
X}
X
X/*
X * sgr_open - open a shadow group file
X *
X *	sgr_open() encapsulates the open operation.  it returns
X *	TRUE or FALSE depending on the shadow group file being
X *	properly opened.
X */
X
Xint
Xsgr_open (mode)
Xint	mode;
X{
X	char	buf[8192];
X	char	*cp;
X	struct	sg_file_entry	*sgrf;
X	struct	sgrp	*sgrent;
X
X	if (isopen || (mode != O_RDONLY && mode != O_RDWR))
X		return 0;
X
X	if (mode != O_RDONLY && ! islocked &&
X			strcmp (sg_filename, SGROUP) == 0)
X		return 0;
X
X	if ((sgrfp = fopen (sg_filename, mode == O_RDONLY ? "r":"r+")) == 0)
X		return 0;
X
X	sgr_head = sgr_tail = sgr_cursor = 0;
X	sgr_changed = 0;
X
X	while (fgetsx (buf, sizeof buf, sgrfp) != (char *) 0) {
X		if (cp = strrchr (buf, '\n'))
X			*cp = '\0';
X
X		if (! (sgrf = (struct sg_file_entry *) malloc (sizeof *sgrf)))
X			return 0;
X
X		sgrf->sgr_changed = 0;
X		sgrf->sgr_line = strdup (buf);
X		if ((sgrent = sgetgsent (buf)) && ! (sgrent = sgr_dup (sgrent)))
X			return 0;
X
X		sgrf->sgr_entry = sgrent;
X
X		if (sgr_head == 0) {
X			sgr_head = sgr_tail = sgrf;
X			sgrf->sgr_next = 0;
X		} else {
X			sgr_tail->sgr_next = sgrf;
X			sgrf->sgr_next = 0;
X			sgr_tail = sgrf;
X		}
X	}
X	isopen++;
X	open_modes = mode;
X
X	return 1;
X}
X
X/*
X * sgr_close - close the shadow group file
X *
X *	sgr_close() outputs any modified shadow group file entries and
X *	frees any allocated memory.
X */
X
Xint
Xsgr_close ()
X{
X	char	backup[BUFSIZ];
X	int	fd;
X	int	mask;
X	int	c;
X	int	i;
X	int	errors = 0;
X	FILE	*bkfp;
X	struct	sg_file_entry *sgrf;
X	struct	sg_file_entry *osgrf;
X
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (islocked && lock_pid != getpid ()) {
X		isopen = 0;
X		islocked = 0;
X		errno = EACCES;
X		return 0;
X	}
X	strcpy (backup, sg_filename);
X	strcat (backup, "-");
X
X	if (open_modes == O_RDWR && sgr_changed) {
X		mask = umask (0222);
X		if ((bkfp = fopen (backup, "w")) == 0) {
X			umask (mask);
X			return 0;
X		}
X		umask (mask);
X
X		rewind (sgrfp);
X		while ((c = getc (sgrfp)) != EOF) {
X			if (putc (c, bkfp) == EOF) {
X				fclose (bkfp);
X				return 0;
X			}
X		}
X		if (fclose (bkfp))
X			return 0;
X
X		isopen = 0;
X		(void) fclose (sgrfp);
X
X		mask = umask (0222);
X		if (! (sgrfp = fopen (sg_filename, "w"))) {
X			umask (mask);
X			return 0;
X		}
X		umask (mask);
X
X		for (sgrf = sgr_head;! errors && sgrf;sgrf = sgrf->sgr_next) {
X			if (sgrf->sgr_changed) {
X				if (putgsent (sgrf->sgr_entry, sgrfp))
X					errors++;
X			} else {
X				if (fputsx (sgrf->sgr_line, sgrfp))
X					errors++;
X
X				if (putc ('\n', sgrfp) == EOF)
X					errors++;
X			}
X		}
X		if (fflush (sgrfp))
X			errors++;
X
X		if (errors) {
X			unlink (sg_filename);
X			link (backup, sg_filename);
X			unlink (backup);
X			return 0;
X		}
X	}
X	if (fclose (sgrfp))
X		return 0;
X
X	sgrfp = 0;
X
X	while (sgr_head != 0) {
X		sgrf = sgr_head;
X		sgr_head = sgrf->sgr_next;
X
X		if (sgrf->sgr_entry) {
X			sgr_free (sgrf->sgr_entry);
X			free (sgrf->sgr_entry);
X		}
X		if (sgrf->sgr_line)
X			free (sgrf->sgr_line);
X
X		free (sgrf);
X	}
X	sgr_tail = 0;
X	return 1;
X}
X
Xint
Xsgr_update (sgrent)
Xstruct	sgrp	*sgrent;
X{
X	struct	sg_file_entry	*sgrf;
X	struct	sgrp	*nsgr;
X
X	if (! isopen || open_modes == O_RDONLY) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (sgrf = sgr_head;sgrf != 0;sgrf = sgrf->sgr_next) {
X		if (sgrf->sgr_entry == 0)
X			continue;
X
X		if (strcmp (sgrent->sg_name, sgrf->sgr_entry->sg_name) != 0)
X			continue;
X
X		if (! (nsgr = sgr_dup (sgrent)))
X			return 0;
X		else {
X			sgr_free (sgrf->sgr_entry);
X			*(sgrf->sgr_entry) = *nsgr;
X		}
X		sgrf->sgr_changed = 1;
X		sgr_cursor = sgrf;
X		return sgr_changed = 1;
X	}
X	sgrf = (struct sg_file_entry *) malloc (sizeof *sgrf);
X	if (! (sgrf->sgr_entry = sgr_dup (sgrent)))
X		return 0;
X
X	sgrf->sgr_changed = 1;
X	sgrf->sgr_next = 0;
X	sgrf->sgr_line = 0;
X
X	if (sgr_tail)
X		sgr_tail->sgr_next = sgrf;
X
X	if (! sgr_head)
X		sgr_head = sgrf;
X
X	sgr_tail = sgrf;
X
X	return sgr_changed = 1;
X}
X
Xint
Xsgr_remove (name)
Xchar	*name;
X{
X	struct	sg_file_entry	*sgrf;
X	struct	sg_file_entry	*osgrf;
X
X	if (! isopen || open_modes == O_RDONLY) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (osgrf = 0, sgrf = sgr_head;sgrf != 0;
X			osgrf = sgrf, sgrf = sgrf->sgr_next) {
X		if (! sgrf->sgr_entry)
X			continue;
X
X		if (strcmp (name, sgrf->sgr_entry->sg_name) != 0)
X			continue;
X
X		if (sgrf == sgr_cursor)
X			sgr_cursor = osgrf;
X
X		if (osgrf != 0)
X			osgrf->sgr_next = sgrf->sgr_next;
X		else
X			sgr_head = sgrf->sgr_next;
X
X		if (sgrf == sgr_tail)
X			sgr_tail = osgrf;
X
X		return sgr_changed = 1;
X	}
X	errno = ENOENT;
X	return 0;
X}
X
Xstruct sgrp *
Xsgr_locate (name)
Xchar	*name;
X{
X	struct	sg_file_entry	*sgrf;
X
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	for (sgrf = sgr_head;sgrf != 0;sgrf = sgrf->sgr_next) {
X		if (sgrf->sgr_entry == 0)
X			continue;
X
X		if (strcmp (name, sgrf->sgr_entry->sg_name) == 0) {
X			sgr_cursor = sgrf;
X			return sgrf->sgr_entry;
X		}
X	}
X	errno = ENOENT;
X	return 0;
X}
X
Xint
Xsgr_rewind ()
X{
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	sgr_cursor = 0;
X	return 1;
X}
X
Xstruct sgrp *
Xsgr_next ()
X{
X	if (! isopen) {
X		errno = EINVAL;
X		return 0;
X	}
X	if (sgr_cursor == 0)
X		sgr_cursor = sgr_head;
X	else
X		sgr_cursor = sgr_cursor->sgr_next;
X
X	while (sgr_cursor) {
X		if (sgr_cursor->sgr_entry)
X			return sgr_cursor->sgr_entry;
X
X		sgr_cursor = sgr_cursor->sgr_next;
X	}
X	return 0;
X}
SHAR_EOF
if test 11482 -ne "`wc -c < 'sgroupio.c'`"
then
	echo shar: "error transmitting 'sgroupio.c'" '(should have been 11482 characters)'
fi
fi
exit 0
#	End of shell archive
-- 
John F. Haugh II        | Distribution to  | UUCP: ...!cs.utexas.edu!rpp386!jfh
Ma Bell: (512) 255-8251 | GEnie PROHIBITED :-) |  Domain: jfh at rpp386.cactus.org
"If liberals interpreted the 2nd Amendment the same way they interpret the
 rest of the Constitution, gun ownership would be mandatory."