shadow/libmisc/hushed.c

/*
 * Copyright 1991, 1993, Julianne Frances Haugh and Chip Rosenthal
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#ident "$Id: hushed.c,v 1.7 2005/08/31 17:24:57 kloczek Exp $"

#include <sys/types.h>
#include <stdio.h>
#include "defines.h"
#include "prototypes.h"
#include "getdef.h"
#include <pwd.h>
/*
 * hushed - determine if a user receives login messages
 *
 * Look in the hushed-logins file (or user's home directory) to see
 * if the user is to receive the login-time messages.
 */
int hushed (const struct passwd *pw)
{
	char *hushfile;
	char buf[BUFSIZ];
	int found;
	FILE *fp;

	/*
	 * Get the name of the file to use.  If this option is not
	 * defined, default to a noisy login.
	 */

	if ((hushfile = getdef_str ("HUSHLOGIN_FILE")) == NULL)
		return 0;

	/*
	 * If this is not a fully rooted path then see if the
	 * file exists in the user's home directory.
	 */

	if (hushfile[0] != '/') {
		snprintf (buf, sizeof (buf), "%s/%s", pw->pw_dir, hushfile);
		return (access (buf, F_OK) == 0);
	}

	/*
	 * If this is a fully rooted path then go through the file
	 * and see if this user is in there.
	 */

	if ((fp = fopen (hushfile, "r")) == NULL)
		return 0;

	for (found = 0; !found && fgets (buf, sizeof buf, fp);) {
		buf[strlen (buf) - 1] = '\0';
		found = !strcmp (buf,
				 buf[0] == '/' ? pw->pw_shell : pw->pw_name);
	}
	(void) fclose (fp);
	return found;
}