b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
547 lines
12 KiB
C
547 lines
12 KiB
C
/* $NetBSD: getusershell.c,v 1.27 2008/04/28 20:22:59 martin 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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*
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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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* The Regents of the University of California. 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 the University 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 THE REGENTS 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 THE REGENTS 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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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 1.27 2008/04/28 20:22:59 martin 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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#include <paths.h>
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#include <stdarg.h>
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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 <unistd.h>
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#ifdef HESIOD
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#include <hesiod.h>
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#endif
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/ypclnt.h>
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#include <rpcsvc/yp_prot.h>
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#endif
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#ifdef __weak_alias
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__weak_alias(endusershell,_endusershell)
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__weak_alias(getusershell,_getusershell)
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__weak_alias(setusershell,_setusershell)
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#endif
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/*
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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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#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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* files methods
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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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static struct files_state _files_state;
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static int
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_files_start(struct files_state *state)
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{
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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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_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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_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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int rv;
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_DIAGASSERT(retval != NULL);
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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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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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continue;
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sp = cp;
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while (!isspace((unsigned char) *cp) && *cp != '#'
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&& *cp != '\0')
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cp++;
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*cp++ = '\0';
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*retval = sp;
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return NS_SUCCESS;
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}
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return NS_NOTFOUND;
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}
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#ifdef HESIOD
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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_setusershell(void *nsrv, void *nscb, va_list ap)
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{
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return _dns_start(&_dns_state);
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}
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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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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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rv = NS_NOTFOUND;
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else
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rv = NS_UNAVAIL;
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} else {
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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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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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/*
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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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static int
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_nis_start(struct nis_state *state)
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{
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_DIAGASSERT(state != 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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}
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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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default:
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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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char *key, *data;
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int keylen, datalen, rv, nisr;
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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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key = NULL;
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data = NULL;
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rv = NS_NOTFOUND;
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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(_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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rv = NS_NOTFOUND;
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goto nisent_out;
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default:
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rv = NS_UNAVAIL;
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goto nisent_out;
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}
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} else { /* new search */
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if (yp_first(_nis_state.domain, "shells",
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&_nis_state.current, &_nis_state.currentlen,
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&data, &datalen)) {
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rv = NS_UNAVAIL;
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goto nisent_out;
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}
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}
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data[datalen] = '\0'; /* clear trailing \n */
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strlcpy(curshell, data, sizeof(curshell));
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*retval = curshell;
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rv = NS_SUCCESS;
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nisent_out:
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if (key)
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free(key);
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if (data)
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free(data);
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if (rv != NS_SUCCESS) /* any failure halts search */
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_nis_state.done = 1;
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return rv;
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}
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#endif /* YP */
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/*
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* public functions
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*/
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void
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endusershell(void)
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{
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_endusershell, NULL)
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NS_DNS_CB(_dns_endusershell, NULL)
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NS_NIS_CB(_nis_endusershell, NULL)
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NS_NULL_CB
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};
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mutex_lock(&__shellmutex);
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curokshell = okshells; /* reset okshells fallback state */
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shellsfound = 0;
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/* force all endusershell() methods */
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(void) nsdispatch(NULL, dtab, NSDB_SHELLS, "endusershell",
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__nsdefaultfiles_forceall);
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mutex_unlock(&__shellmutex);
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}
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__aconst char *
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getusershell(void)
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{
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int rv;
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__aconst char *retval;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_getusershell, NULL)
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NS_DNS_CB(_dns_getusershell, NULL)
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NS_NIS_CB(_nis_getusershell, NULL)
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NS_NULL_CB
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};
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mutex_lock(&__shellmutex);
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retval = NULL;
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do {
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rv = nsdispatch(NULL, dtab, NSDB_SHELLS, "getusershell",
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__nsdefaultsrc, &retval);
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/* loop until failure or non-blank result */
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} while (rv == NS_SUCCESS && retval[0] == '\0');
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if (rv == NS_SUCCESS) {
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shellsfound++;
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} else if (shellsfound == 0) { /* no shells; fall back to okshells */
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if (curokshell != NULL) {
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retval = __UNCONST(*curokshell);
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curokshell++;
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rv = NS_SUCCESS;
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}
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}
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mutex_unlock(&__shellmutex);
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return (rv == NS_SUCCESS) ? retval : NULL;
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}
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void
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setusershell(void)
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{
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_setusershell, NULL)
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NS_DNS_CB(_dns_setusershell, NULL)
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NS_NIS_CB(_nis_setusershell, NULL)
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NS_NULL_CB
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};
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mutex_lock(&__shellmutex);
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curokshell = okshells; /* reset okshells fallback state */
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shellsfound = 0;
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/* force all setusershell() methods */
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(void) nsdispatch(NULL, dtab, NSDB_SHELLS, "setusershell",
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__nsdefaultfiles_forceall);
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mutex_unlock(&__shellmutex);
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}
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