Overhaul the use of nsdispatch(3) by public APIs so that the back-end
methods use va_list in a manner that is directly related to the public API. This makes it much easier to write dynamic nsswitch backends for the getusershell(3) (et al) functions. Per my proposal on tech-userlevel in September 2004.
This commit is contained in:
lukem
parent
d81b21774f
commit
a30452355d
@ -1,4 +1,40 @@
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/* $NetBSD: getusershell.c,v 1.23 2003/08/07 16:42:51 agc Exp $ */
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/* $NetBSD: getusershell.c,v 1.24 2005/02/28 02:56:28 lukem Exp $ */
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/*-
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* Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1985, 1993
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@ -34,14 +70,17 @@
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#if 0
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static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: getusershell.c,v 1.23 2003/08/07 16:42:51 agc Exp $");
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__RCSID("$NetBSD: getusershell.c,v 1.24 2005/02/28 02:56:28 lukem Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/param.h>
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#include <sys/file.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <nsswitch.h>
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@ -50,7 +89,6 @@ __RCSID("$NetBSD: getusershell.c,v 1.23 2003/08/07 16:42:51 agc Exp $");
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stringlist.h>
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#include <unistd.h>
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#ifdef HESIOD
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@ -69,74 +107,97 @@ __weak_alias(setusershell,_setusershell)
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#endif
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/*
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* Local shells should NOT be added here. They should be added in
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* /etc/shells.
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* Local shells should NOT be added here.
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* 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;
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static StringList *sl;
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static const char *const *initshells __P((void));
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#ifdef _REENTRANT
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static mutex_t __shellmutex = MUTEX_INITIALIZER;
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#endif
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static char curshell[MAXPATHLEN + 2];
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static const char *const *curokshell = okshells;
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static int shellsfound = 0;
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/*
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* Get a list of shells from "shells" nsswitch database
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* files methods
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*/
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__aconst char *
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getusershell()
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{
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__aconst char *ret;
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if (curshell == NULL)
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curshell = initshells();
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/*LINTED*/
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ret = (__aconst char *)*curshell;
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if (ret != NULL)
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curshell++;
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return (ret);
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}
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/* state shared between files methods */
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struct files_state {
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FILE *fp;
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};
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void
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endusershell()
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{
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if (sl)
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sl_free(sl, 1);
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sl = NULL;
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curshell = NULL;
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}
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static struct files_state _files_state;
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void
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setusershell()
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static int
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_files_start(struct files_state *state)
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{
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curshell = initshells();
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_DIAGASSERT(state != NULL);
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if (state->fp == NULL) {
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state->fp = fopen(_PATH_SHELLS, "r");
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if (state->fp == NULL)
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return NS_UNAVAIL;
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} else {
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rewind(state->fp);
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}
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return NS_SUCCESS;
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}
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static int
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_files_end(struct files_state *state)
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{
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static int _local_initshells __P((void *, void *, va_list));
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_DIAGASSERT(state != NULL);
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if (state->fp) {
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(void) fclose(state->fp);
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state->fp = NULL;
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}
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return NS_SUCCESS;
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}
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/*ARGSUSED*/
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static int
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_local_initshells(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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_files_setusershell(void *nsrv, void *nscb, va_list ap)
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{
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return _files_start(&_files_state);
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}
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/*ARGSUSED*/
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static int
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_files_endusershell(void *nsrv, void *nscb, va_list ap)
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{
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return _files_end(&_files_state);
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}
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/*ARGSUSED*/
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static int
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_files_getusershell(void *nsrv, void *nscb, va_list ap)
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{
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char **retval = va_arg(ap, char **);
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char *sp, *cp;
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FILE *fp;
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char line[MAXPATHLEN + 2];
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int rv;
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if (sl)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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return (NS_UNAVAIL);
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_DIAGASSERT(retval != NULL);
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if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
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return (NS_UNAVAIL);
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*retval = NULL;
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if (_files_state.fp == NULL) { /* only start if file not open yet */
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rv = _files_start(&_files_state);
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if (rv != NS_SUCCESS)
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return rv;
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}
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sp = cp = line;
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while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
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while (fgets(curshell, sizeof(curshell) - 1, _files_state.fp) != NULL) {
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sp = cp = curshell;
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while (*cp != '#' && *cp != '/' && *cp != '\0')
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cp++;
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if (*cp == '#' || *cp == '\0')
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@ -146,161 +207,348 @@ _local_initshells(rv, cb_data, ap)
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&& *cp != '\0')
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cp++;
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*cp++ = '\0';
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if (sl_add(sl, strdup(sp)) == -1)
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return (NS_UNAVAIL);
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*retval = sp;
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return NS_SUCCESS;
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}
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(void)fclose(fp);
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return (NS_SUCCESS);
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return NS_NOTFOUND;
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}
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#ifdef HESIOD
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static int _dns_initshells __P((void *, void *, va_list));
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/*
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* dns methods
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*/
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/* state shared between dns methods */
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struct dns_state {
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void *context; /* Hesiod context */
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int num; /* shell index, -1 if no more */
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};
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static struct dns_state _dns_state;
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static int
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_dns_start(struct dns_state *state)
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{
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_DIAGASSERT(state != NULL);
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state->num = 0;
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if (state->context == NULL) { /* setup Hesiod */
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if (hesiod_init(&state->context) == -1)
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return NS_UNAVAIL;
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}
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return NS_SUCCESS;
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}
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static int
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_dns_end(struct dns_state *state)
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{
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_DIAGASSERT(state != NULL);
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state->num = 0;
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if (state->context) {
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hesiod_end(state->context);
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state->context = NULL;
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}
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return NS_SUCCESS;
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}
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/*ARGSUSED*/
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static int
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_dns_initshells(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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_dns_setusershell(void *nsrv, void *nscb, va_list ap)
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{
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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)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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return (NS_UNAVAIL);
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return _dns_start(&_dns_state);
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}
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r = NS_UNAVAIL;
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if (hesiod_init(&context) == -1)
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return (r);
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/*ARGSUSED*/
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static int
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_dns_endusershell(void *nsrv, void *nscb, va_list ap)
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{
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for (hsindex = 0; ; hsindex++) {
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snprintf(shellname, sizeof(shellname)-1, "shells-%d", hsindex);
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hp = hesiod_resolve(context, shellname, "shells");
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return _dns_end(&_dns_state);
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}
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/*ARGSUSED*/
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static int
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_dns_getusershell(void *nsrv, void *nscb, va_list ap)
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{
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char **retval = va_arg(ap, char **);
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char shellname[] = "shells-NNNNNNNNNN";
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char **hp, *ep;
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int rv;
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_DIAGASSERT(retval != NULL);
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*retval = NULL;
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if (_dns_state.num == -1) /* exhausted search */
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return NS_NOTFOUND;
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if (_dns_state.context == NULL) {
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/* only start if Hesiod not setup */
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rv = _dns_start(&_dns_state);
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if (rv != NS_SUCCESS)
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return rv;
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}
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hp = NULL;
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rv = NS_NOTFOUND;
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/* find shells-NNN */
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snprintf(shellname, sizeof(shellname), "shells-%d", _dns_state.num);
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_dns_state.num++;
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hp = hesiod_resolve(_dns_state.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;
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if (errno == ENOENT)
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rv = NS_NOTFOUND;
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else
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r = NS_SUCCESS;
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}
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break;
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rv = NS_UNAVAIL;
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} else {
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int bad = 0;
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if ((ep = strchr(hp[0], '\n')) != NULL)
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*ep = '\0'; /* clear trailing \n */
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/* only use first result */
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strlcpy(curshell, hp[0], sizeof(curshell));
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*retval = curshell;
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rv = NS_SUCCESS;
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}
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for (hpi = 0; hp[hpi]; hpi++)
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if (sl_add(sl, hp[hpi]) == -1) {
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bad = 1;
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break;
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}
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free(hp);
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if (bad)
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break;
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}
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}
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hesiod_end(context);
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return (r);
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if (hp)
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hesiod_free_list(_dns_state.context, hp);
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if (rv != NS_SUCCESS)
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_dns_state.num = -1; /* any failure halts search */
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return rv;
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}
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#endif /* HESIOD */
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#ifdef YP
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static int _nis_initshells __P((void *, void *, va_list));
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/*
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* nis methods
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*/
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/* state shared between nis methods */
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struct nis_state {
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char *domain; /* NIS domain */
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int done; /* non-zero if search exhausted */
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char *current; /* current first/next match */
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int currentlen; /* length of _nis_current */
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};
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static struct nis_state _nis_state;
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/*ARGSUSED*/
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static int
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_nis_initshells(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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_nis_start(struct nis_state *state)
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{
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static char *ypdomain;
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if (sl)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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return (NS_UNAVAIL);
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_DIAGASSERT(state != NULL);
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if (ypdomain == NULL) {
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switch (yp_get_default_domain(&ypdomain)) {
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state->done = 0;
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if (state->current) {
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free(state->current);
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state->current = NULL;
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}
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if (state->domain == NULL) { /* setup NIS */
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switch (yp_get_default_domain(&state->domain)) {
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case 0:
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break;
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case YPERR_RESRC:
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return (NS_TRYAGAIN);
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return NS_TRYAGAIN;
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default:
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return (NS_UNAVAIL);
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return NS_UNAVAIL;
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}
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}
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return NS_SUCCESS;
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}
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static int
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_nis_end(struct nis_state *state)
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{
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_DIAGASSERT(state != NULL);
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if (state->domain)
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state->domain = NULL;
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state->done = 0;
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if (state->current)
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free(state->current);
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state->current = NULL;
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return NS_SUCCESS;
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}
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/*ARGSUSED*/
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static int
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_nis_setusershell(void *nsrv, void *nscb, va_list ap)
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{
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return _nis_start(&_nis_state);
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}
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/*ARGSUSED*/
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static int
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_nis_endusershell(void *nsrv, void *nscb, va_list ap)
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{
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return _nis_end(&_nis_state);
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}
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/*ARGSUSED*/
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static int
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_nis_getusershell(void *nsrv, void *nscb, va_list ap)
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{
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char **retval = va_arg(ap, char **);
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for (;;) {
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char *ypcur = NULL;
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int ypcurlen = 0; /* XXX: GCC */
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char *key, *data;
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int keylen, datalen;
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int r;
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int keylen, datalen, rv, nisr;
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key = data = NULL;
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if (ypcur) {
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r = yp_next(ypdomain, "shells", ypcur, ypcurlen,
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_DIAGASSERT(retval != NULL);
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*retval = NULL;
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if (_nis_state.done) /* exhausted search */
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return NS_NOTFOUND;
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||||
if (_nis_state.domain == NULL) {
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/* only start if NIS not setup */
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||||
rv = _nis_start(&_nis_state);
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if (rv != NS_SUCCESS)
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return rv;
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||||
}
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||||
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key = NULL;
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||||
data = NULL;
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rv = NS_NOTFOUND;
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||||
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||||
if (_nis_state.current) { /* already searching */
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nisr = yp_next(_nis_state.domain, "shells",
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_nis_state.current, _nis_state.currentlen,
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&key, &keylen, &data, &datalen);
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free(ypcur);
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switch (r) {
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free(_nis_state.current);
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_nis_state.current = NULL;
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switch (nisr) {
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case 0:
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_nis_state.current = key;
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||||
_nis_state.currentlen = keylen;
|
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key = NULL;
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||||
break;
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||||
case YPERR_NOMORE:
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||||
free(key);
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||||
free(data);
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||||
return (NS_SUCCESS);
|
||||
rv = NS_NOTFOUND;
|
||||
goto nisent_out;
|
||||
default:
|
||||
free(key);
|
||||
free(data);
|
||||
return (NS_UNAVAIL);
|
||||
rv = NS_UNAVAIL;
|
||||
goto nisent_out;
|
||||
}
|
||||
ypcur = key;
|
||||
ypcurlen = keylen;
|
||||
} else {
|
||||
if (yp_first(ypdomain, "shells", &ypcur,
|
||||
&ypcurlen, &data, &datalen)) {
|
||||
free(data);
|
||||
return (NS_UNAVAIL);
|
||||
} else { /* new search */
|
||||
if (yp_first(_nis_state.domain, "shells",
|
||||
&_nis_state.current, &_nis_state.currentlen,
|
||||
&data, &datalen)) {
|
||||
rv = NS_UNAVAIL;
|
||||
goto nisent_out;
|
||||
}
|
||||
}
|
||||
|
||||
data[datalen] = '\0'; /* clear trailing \n */
|
||||
if (sl_add(sl, data) == -1)
|
||||
return (NS_UNAVAIL);
|
||||
}
|
||||
strlcpy(curshell, data, sizeof(curshell));
|
||||
*retval = curshell;
|
||||
rv = NS_SUCCESS;
|
||||
|
||||
nisent_out:
|
||||
if (key)
|
||||
free(key);
|
||||
if (data)
|
||||
free(data);
|
||||
if (rv != NS_SUCCESS) /* any failure halts search */
|
||||
_nis_state.done = 1;
|
||||
return rv;
|
||||
}
|
||||
|
||||
#endif /* YP */
|
||||
|
||||
static const char *const *
|
||||
initshells()
|
||||
|
||||
/*
|
||||
* public functions
|
||||
*/
|
||||
|
||||
void
|
||||
endusershell(void)
|
||||
{
|
||||
static const ns_dtab dtab[] = {
|
||||
NS_FILES_CB(_local_initshells, NULL)
|
||||
NS_DNS_CB(_dns_initshells, NULL)
|
||||
NS_NIS_CB(_nis_initshells, NULL)
|
||||
NS_FILES_CB(_files_endusershell, NULL)
|
||||
NS_DNS_CB(_dns_endusershell, NULL)
|
||||
NS_NIS_CB(_nis_endusershell, NULL)
|
||||
{ 0 }
|
||||
};
|
||||
if (sl)
|
||||
sl_free(sl, 1);
|
||||
sl = sl_init();
|
||||
if (!sl)
|
||||
goto badinitshells;
|
||||
|
||||
if (nsdispatch(NULL, dtab, NSDB_SHELLS, "initshells", __nsdefaultsrc)
|
||||
!= NS_SUCCESS) {
|
||||
badinitshells:
|
||||
if (sl)
|
||||
sl_free(sl, 1);
|
||||
sl = NULL;
|
||||
return (okshells);
|
||||
}
|
||||
if (sl_add(sl, NULL) == -1)
|
||||
goto badinitshells;
|
||||
mutex_lock(&__shellmutex);
|
||||
|
||||
return (const char *const *)(sl->sl_str);
|
||||
curokshell = okshells; /* reset okshells fallback state */
|
||||
shellsfound = 0;
|
||||
|
||||
/* force all endusershell() methods */
|
||||
(void) nsdispatch(NULL, dtab, NSDB_SHELLS, "endusershell",
|
||||
__nsdefaultfiles_forceall);
|
||||
mutex_unlock(&__shellmutex);
|
||||
}
|
||||
|
||||
__aconst char *
|
||||
getusershell(void)
|
||||
{
|
||||
int rv;
|
||||
__aconst char *retval;
|
||||
|
||||
static const ns_dtab dtab[] = {
|
||||
NS_FILES_CB(_files_getusershell, NULL)
|
||||
NS_DNS_CB(_dns_getusershell, NULL)
|
||||
NS_NIS_CB(_nis_getusershell, NULL)
|
||||
{ 0 }
|
||||
};
|
||||
|
||||
mutex_lock(&__shellmutex);
|
||||
|
||||
retval = NULL;
|
||||
do {
|
||||
rv = nsdispatch(NULL, dtab, NSDB_SHELLS, "getusershell",
|
||||
__nsdefaultsrc, &retval);
|
||||
/* loop until failure or non-blank result */
|
||||
} while (rv == NS_SUCCESS && retval[0] == '\0');
|
||||
|
||||
if (rv == NS_SUCCESS) {
|
||||
shellsfound++;
|
||||
} else if (shellsfound == 0) { /* no shells; fall back to okshells */
|
||||
if (curokshell != NULL) {
|
||||
/*LINTED*/
|
||||
retval = (__aconst char *)*curokshell;
|
||||
curokshell++;
|
||||
rv = NS_SUCCESS;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_unlock(&__shellmutex);
|
||||
return (rv == NS_SUCCESS) ? retval : NULL;
|
||||
}
|
||||
|
||||
void
|
||||
setusershell(void)
|
||||
{
|
||||
static const ns_dtab dtab[] = {
|
||||
NS_FILES_CB(_files_setusershell, NULL)
|
||||
NS_DNS_CB(_dns_setusershell, NULL)
|
||||
NS_NIS_CB(_nis_setusershell, NULL)
|
||||
{ 0 }
|
||||
};
|
||||
|
||||
mutex_lock(&__shellmutex);
|
||||
|
||||
curokshell = okshells; /* reset okshells fallback state */
|
||||
shellsfound = 0;
|
||||
|
||||
/* force all setusershell() methods */
|
||||
(void) nsdispatch(NULL, dtab, NSDB_SHELLS, "setusershell",
|
||||
__nsdefaultfiles_forceall);
|
||||
mutex_unlock(&__shellmutex);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user