99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID("$Id: chkshell.c,v 1.1 1997/12/07 23:27:00 marekm Exp $")
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#include <sys/types.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include "prototypes.h"
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#include "defines.h"
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#ifndef SHELLS_FILE
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#define SHELLS_FILE "/etc/shells"
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#endif
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/*
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* check_shell - see if the user's login shell is listed in /etc/shells
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*
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* The /etc/shells file is read for valid names of login shells. If the
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* /etc/shells file does not exist the user cannot set any shell unless
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* they are root.
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*
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* If getusershell() is available (Linux, *BSD, possibly others), use it
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* instead of re-implementing it.
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*/
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int
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check_shell(const char *sh)
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{
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char *cp;
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int found = 0;
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#ifndef HAVE_GETUSERSHELL
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char buf[BUFSIZ];
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FILE *fp;
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#endif
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#ifdef HAVE_GETUSERSHELL
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setusershell();
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while ((cp = getusershell())) {
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if (*cp == '#')
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continue;
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if (strcmp(cp, sh) == 0) {
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found = 1;
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break;
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}
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}
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endusershell();
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#else
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if ((fp = fopen (SHELLS_FILE, "r")) == (FILE *) 0)
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return 0;
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while (fgets (buf, sizeof(buf), fp)) {
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if ((cp = strrchr(buf, '\n')))
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*cp = '\0';
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if (buf[0] == '#')
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continue;
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if (strcmp (buf, sh) == 0) {
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found = 1;
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break;
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}
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}
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fclose (fp);
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#endif
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return found;
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}
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