shadow/libmisc/chkshell.c

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/*
* Copyright 1989 - 1994, Julianne Frances Haugh
* 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>
#include "rcsid.h"
RCSID("$Id: chkshell.c,v 1.1 1997/12/07 23:27:00 marekm Exp $")
#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#include "prototypes.h"
#include "defines.h"
#ifndef SHELLS_FILE
#define SHELLS_FILE "/etc/shells"
#endif
/*
* check_shell - see if the user's login shell is listed in /etc/shells
*
* The /etc/shells file is read for valid names of login shells. If the
* /etc/shells file does not exist the user cannot set any shell unless
* they are root.
*
* If getusershell() is available (Linux, *BSD, possibly others), use it
* instead of re-implementing it.
*/
int
check_shell(const char *sh)
{
char *cp;
int found = 0;
#ifndef HAVE_GETUSERSHELL
char buf[BUFSIZ];
FILE *fp;
#endif
#ifdef HAVE_GETUSERSHELL
setusershell();
while ((cp = getusershell())) {
if (*cp == '#')
continue;
if (strcmp(cp, sh) == 0) {
found = 1;
break;
}
}
endusershell();
#else
if ((fp = fopen (SHELLS_FILE, "r")) == (FILE *) 0)
return 0;
while (fgets (buf, sizeof(buf), fp)) {
if ((cp = strrchr(buf, '\n')))
*cp = '\0';
if (buf[0] == '#')
continue;
if (strcmp (buf, sh) == 0) {
found = 1;
break;
}
}
fclose (fp);
#endif
return found;
}