FreeBSD-5.3/lib/libc/gen/getusershell.c
/*
* Copyright (c) 1985, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 THE REGENTS 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 THE REGENTS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
/* $NetBSD: getusershell.c,v 1.17 1999/01/25 01:09:34 lukem Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/getusershell.c,v 1.9 2003/04/24 20:16:21 nectar Exp $");
#include "namespace.h"
#include <sys/param.h>
#include <sys/file.h>
#include <ctype.h>
#include <errno.h>
#include <nsswitch.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stringlist.h>
#include <unistd.h>
#ifdef HESIOD
#include <hesiod.h>
#endif
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/yp_prot.h>
#endif
#include "un-namespace.h"
/*
* Local shells should NOT be added here. They should be added in
* /etc/shells.
*/
static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
static const char *const *curshell;
static StringList *sl;
static const char *const *initshells(void);
/*
* Get a list of shells from "shells" nsswitch database
*/
char *
getusershell(void)
{
char *ret;
if (curshell == NULL)
curshell = initshells();
/*LINTED*/
ret = (char *)*curshell;
if (ret != NULL)
curshell++;
return (ret);
}
void
endusershell(void)
{
if (sl) {
sl_free(sl, 1);
sl = NULL;
}
curshell = NULL;
}
void
setusershell(void)
{
curshell = initshells();
}
static int _local_initshells(void *, void *, va_list);
/*ARGSUSED*/
static int
_local_initshells(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
char *sp, *cp;
FILE *fp;
char line[MAXPATHLEN + 2];
if (sl)
sl_free(sl, 1);
sl = sl_init();
if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
return NS_UNAVAIL;
sp = cp = line;
while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
while (*cp != '#' && *cp != '/' && *cp != '\0')
cp++;
if (*cp == '#' || *cp == '\0')
continue;
sp = cp;
while (!isspace(*cp) && *cp != '#' && *cp != '\0')
cp++;
*cp++ = '\0';
sl_add(sl, strdup(sp));
}
(void)fclose(fp);
return NS_SUCCESS;
}
#ifdef HESIOD
static int _dns_initshells(void *, void *, va_list);
/*ARGSUSED*/
static int
_dns_initshells(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
char shellname[] = "shells-XXXXX";
int hsindex, hpi, r;
char **hp;
void *context;
if (sl)
sl_free(sl, 1);
sl = sl_init();
r = NS_UNAVAIL;
if (hesiod_init(&context) == -1)
return (r);
for (hsindex = 0; ; hsindex++) {
snprintf(shellname, sizeof(shellname)-1, "shells-%d", hsindex);
hp = hesiod_resolve(context, shellname, "shells");
if (hp == NULL) {
if (errno == ENOENT) {
if (hsindex == 0)
r = NS_NOTFOUND;
else
r = NS_SUCCESS;
}
break;
} else {
for (hpi = 0; hp[hpi]; hpi++)
sl_add(sl, hp[hpi]);
free(hp);
}
}
hesiod_end(context);
return (r);
}
#endif /* HESIOD */
#ifdef YP
static int _nis_initshells(void *, void *, va_list);
/*ARGSUSED*/
static int
_nis_initshells(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
static char *ypdomain;
char *key, *data;
char *lastkey;
int keylen, datalen;
int r;
if (sl)
sl_free(sl, 1);
sl = sl_init();
if (ypdomain == NULL) {
switch (yp_get_default_domain(&ypdomain)) {
case 0:
break;
case YPERR_RESRC:
return NS_TRYAGAIN;
default:
return NS_UNAVAIL;
}
}
/*
* `key' and `data' point to strings dynamically allocated by
* the yp_... functions.
* `data' is directly put into the stringlist of shells.
*/
key = data = NULL;
if (yp_first(ypdomain, "shells", &key, &keylen, &data, &datalen))
return NS_UNAVAIL;
do {
data[datalen] = '\0'; /* clear trailing \n */
sl_add(sl, data);
lastkey = key;
r = yp_next(ypdomain, "shells", lastkey, keylen,
&key, &keylen, &data, &datalen);
free(lastkey);
} while (r == 0);
if (r == YPERR_NOMORE) {
/*
* `data' and `key' ought to be NULL - do not try to free them.
*/
return NS_SUCCESS;
}
return NS_UNAVAIL;
}
#endif /* YP */
static const char *const *
initshells()
{
static const ns_dtab dtab[] = {
NS_FILES_CB(_local_initshells, NULL)
NS_DNS_CB(_dns_initshells, NULL)
NS_NIS_CB(_nis_initshells, NULL)
{ 0 }
};
if (sl)
sl_free(sl, 1);
sl = sl_init();
if (_nsdispatch(NULL, dtab, NSDB_SHELLS, "initshells", __nsdefaultsrc)
!= NS_SUCCESS) {
if (sl)
sl_free(sl, 1);
sl = NULL;
return (okshells);
}
sl_add(sl, NULL);
return (const char *const *)(sl->sl_str);
}