NetBSD/lib/libc/gen/getusershell.c

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/* $NetBSD: getusershell.c,v 1.18 1999/04/18 02:04:05 lukem Exp $ */
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/*
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
#else
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__RCSID("$NetBSD: getusershell.c,v 1.18 1999/04/18 02:04:05 lukem Exp $");
#endif
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#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
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#include <sys/param.h>
#include <sys/file.h>
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#include <ctype.h>
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#include <errno.h>
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#include <nsswitch.h>
#include <paths.h>
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#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <stringlist.h>
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#include <unistd.h>
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#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
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#ifdef HESIOD
#include <hesiod.h>
#endif
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/yp_prot.h>
#endif
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#ifdef __weak_alias
__weak_alias(endusershell,_endusershell);
__weak_alias(getusershell,_getusershell);
__weak_alias(setusershell,_setusershell);
#endif
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/*
* Local shells should NOT be added here. They should be added in
* /etc/shells.
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*/
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static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
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static const char *const *curshell;
static StringList *sl;
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static const char *const *initshells __P((void));
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/*
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* Get a list of shells from "shells" nsswitch database
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*/
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__aconst char *
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getusershell()
{
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__aconst char *ret;
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if (curshell == NULL)
curshell = initshells();
/*LINTED*/
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ret = (__aconst char *)*curshell;
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if (ret != NULL)
curshell++;
return (ret);
}
void
endusershell()
{
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if (sl)
sl_free(sl, 1);
sl = NULL;
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curshell = NULL;
}
void
setusershell()
{
curshell = initshells();
}
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static int _local_initshells __P((void *, void *, va_list));
/*ARGSUSED*/
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static int
_local_initshells(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
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{
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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)
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return NS_UNAVAIL;
sp = cp = line;
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while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
while (*cp != '#' && *cp != '/' && *cp != '\0')
cp++;
if (*cp == '#' || *cp == '\0')
continue;
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sp = cp;
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while (!isspace(*cp) && *cp != '#' && *cp != '\0')
cp++;
*cp++ = '\0';
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sl_add(sl, strdup(sp));
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}
(void)fclose(fp);
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return NS_SUCCESS;
}
#ifdef HESIOD
static int _dns_initshells __P((void *, void *, va_list));
/*ARGSUSED*/
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static int
_dns_initshells(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
char shellname[] = "shells-XXXXX";
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int hsindex, hpi, r;
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char **hp;
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void *context;
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if (sl)
sl_free(sl, 1);
sl = sl_init();
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r = NS_UNAVAIL;
if (hesiod_init(&context) == -1)
return (r);
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for (hsindex = 0; ; hsindex++) {
snprintf(shellname, sizeof(shellname)-1, "shells-%d", hsindex);
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hp = hesiod_resolve(context, shellname, "shells");
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if (hp == NULL) {
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if (errno == ENOENT) {
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if (hsindex == 0)
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r = NS_NOTFOUND;
else
r = NS_SUCCESS;
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}
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break;
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} else {
for (hpi = 0; hp[hpi]; hpi++)
sl_add(sl, hp[hpi]);
free(hp);
}
}
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hesiod_end(context);
return (r);
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}
#endif /* HESIOD */
#ifdef YP
static int _nis_initshells __P((void *, void *, va_list));
/*ARGSUSED*/
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static int
_nis_initshells(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
static char *ypdomain;
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;
}
}
for (;;) {
char *ypcur = NULL;
int ypcurlen = 0; /* XXX: GCC */
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char *key, *data;
int keylen, datalen;
int r;
key = data = NULL;
if (ypcur) {
r = yp_next(ypdomain, "shells", ypcur, ypcurlen,
&key, &keylen, &data, &datalen);
free(ypcur);
switch (r) {
case 0:
break;
case YPERR_NOMORE:
free(key);
free(data);
return NS_SUCCESS;
default:
free(key);
free(data);
return NS_UNAVAIL;
}
ypcur = key;
ypcurlen = keylen;
} else {
if (yp_first(ypdomain, "shells", &ypcur,
&ypcurlen, &data, &datalen)) {
free(data);
return NS_UNAVAIL;
}
}
data[datalen] = '\0'; /* clear trailing \n */
sl_add(sl, data);
}
}
#endif /* YP */
static const char *const *
initshells()
{
static const ns_dtab dtab[] = {
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NS_FILES_CB(_local_initshells, NULL)
NS_DNS_CB(_dns_initshells, NULL)
NS_NIS_CB(_nis_initshells, NULL)
{ 0 }
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};
if (sl)
sl_free(sl, 1);
sl = sl_init();
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if (nsdispatch(NULL, dtab, NSDB_SHELLS, "initshells", __nsdefaultsrc)
!= NS_SUCCESS) {
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if (sl)
sl_free(sl, 1);
sl = NULL;
return (okshells);
}
sl_add(sl, NULL);
return (const char *const *)(sl->sl_str);
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}