minix/lib/libc/gen/getusershell.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

546 lines
12 KiB
C

/* $NetBSD: getusershell.c,v 1.27 2008/04/28 20:22:59 martin Exp $ */
/*-
* Copyright (c) 1999, 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getusershell.c,v 1.27 2008/04/28 20:22:59 martin Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include "reentrant.h"
#include <sys/param.h>
#include <sys/file.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <nsswitch.h>
#include <paths.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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
#ifdef __weak_alias
__weak_alias(endusershell,_endusershell)
__weak_alias(getusershell,_getusershell)
__weak_alias(setusershell,_setusershell)
#endif
/*
* Local shells should NOT be added here.
* They should be added in /etc/shells.
*/
static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
#ifdef _REENTRANT
static mutex_t __shellmutex = MUTEX_INITIALIZER;
#endif
static char curshell[MAXPATHLEN + 2];
static const char *const *curokshell = okshells;
static int shellsfound = 0;
/*
* files methods
*/
/* state shared between files methods */
struct files_state {
FILE *fp;
};
static struct files_state _files_state;
static int
_files_start(struct files_state *state)
{
_DIAGASSERT(state != NULL);
if (state->fp == NULL) {
state->fp = fopen(_PATH_SHELLS, "r");
if (state->fp == NULL)
return NS_UNAVAIL;
} else {
rewind(state->fp);
}
return NS_SUCCESS;
}
static int
_files_end(struct files_state *state)
{
_DIAGASSERT(state != NULL);
if (state->fp) {
(void) fclose(state->fp);
state->fp = NULL;
}
return NS_SUCCESS;
}
/*ARGSUSED*/
static int
_files_setusershell(void *nsrv, void *nscb, va_list ap)
{
return _files_start(&_files_state);
}
/*ARGSUSED*/
static int
_files_endusershell(void *nsrv, void *nscb, va_list ap)
{
return _files_end(&_files_state);
}
/*ARGSUSED*/
static int
_files_getusershell(void *nsrv, void *nscb, va_list ap)
{
char **retval = va_arg(ap, char **);
char *sp, *cp;
int rv;
_DIAGASSERT(retval != NULL);
*retval = NULL;
if (_files_state.fp == NULL) { /* only start if file not open yet */
rv = _files_start(&_files_state);
if (rv != NS_SUCCESS)
return rv;
}
while (fgets(curshell, sizeof(curshell) - 1, _files_state.fp) != NULL) {
sp = cp = curshell;
while (*cp != '#' && *cp != '/' && *cp != '\0')
cp++;
if (*cp == '#' || *cp == '\0')
continue;
sp = cp;
while (!isspace((unsigned char) *cp) && *cp != '#'
&& *cp != '\0')
cp++;
*cp++ = '\0';
*retval = sp;
return NS_SUCCESS;
}
return NS_NOTFOUND;
}
#ifdef HESIOD
/*
* dns methods
*/
/* state shared between dns methods */
struct dns_state {
void *context; /* Hesiod context */
int num; /* shell index, -1 if no more */
};
static struct dns_state _dns_state;
static int
_dns_start(struct dns_state *state)
{
_DIAGASSERT(state != NULL);
state->num = 0;
if (state->context == NULL) { /* setup Hesiod */
if (hesiod_init(&state->context) == -1)
return NS_UNAVAIL;
}
return NS_SUCCESS;
}
static int
_dns_end(struct dns_state *state)
{
_DIAGASSERT(state != NULL);
state->num = 0;
if (state->context) {
hesiod_end(state->context);
state->context = NULL;
}
return NS_SUCCESS;
}
/*ARGSUSED*/
static int
_dns_setusershell(void *nsrv, void *nscb, va_list ap)
{
return _dns_start(&_dns_state);
}
/*ARGSUSED*/
static int
_dns_endusershell(void *nsrv, void *nscb, va_list ap)
{
return _dns_end(&_dns_state);
}
/*ARGSUSED*/
static int
_dns_getusershell(void *nsrv, void *nscb, va_list ap)
{
char **retval = va_arg(ap, char **);
char shellname[] = "shells-NNNNNNNNNN";
char **hp, *ep;
int rv;
_DIAGASSERT(retval != NULL);
*retval = NULL;
if (_dns_state.num == -1) /* exhausted search */
return NS_NOTFOUND;
if (_dns_state.context == NULL) {
/* only start if Hesiod not setup */
rv = _dns_start(&_dns_state);
if (rv != NS_SUCCESS)
return rv;
}
hp = NULL;
rv = NS_NOTFOUND;
/* find shells-NNN */
snprintf(shellname, sizeof(shellname), "shells-%d", _dns_state.num);
_dns_state.num++;
hp = hesiod_resolve(_dns_state.context, shellname, "shells");
if (hp == NULL) {
if (errno == ENOENT)
rv = NS_NOTFOUND;
else
rv = NS_UNAVAIL;
} else {
if ((ep = strchr(hp[0], '\n')) != NULL)
*ep = '\0'; /* clear trailing \n */
/* only use first result */
strlcpy(curshell, hp[0], sizeof(curshell));
*retval = curshell;
rv = NS_SUCCESS;
}
if (hp)
hesiod_free_list(_dns_state.context, hp);
if (rv != NS_SUCCESS)
_dns_state.num = -1; /* any failure halts search */
return rv;
}
#endif /* HESIOD */
#ifdef YP
/*
* nis methods
*/
/* state shared between nis methods */
struct nis_state {
char *domain; /* NIS domain */
int done; /* non-zero if search exhausted */
char *current; /* current first/next match */
int currentlen; /* length of _nis_current */
};
static struct nis_state _nis_state;
static int
_nis_start(struct nis_state *state)
{
_DIAGASSERT(state != NULL);
state->done = 0;
if (state->current) {
free(state->current);
state->current = NULL;
}
if (state->domain == NULL) { /* setup NIS */
switch (yp_get_default_domain(&state->domain)) {
case 0:
break;
case YPERR_RESRC:
return NS_TRYAGAIN;
default:
return NS_UNAVAIL;
}
}
return NS_SUCCESS;
}
static int
_nis_end(struct nis_state *state)
{
_DIAGASSERT(state != NULL);
if (state->domain)
state->domain = NULL;
state->done = 0;
if (state->current)
free(state->current);
state->current = NULL;
return NS_SUCCESS;
}
/*ARGSUSED*/
static int
_nis_setusershell(void *nsrv, void *nscb, va_list ap)
{
return _nis_start(&_nis_state);
}
/*ARGSUSED*/
static int
_nis_endusershell(void *nsrv, void *nscb, va_list ap)
{
return _nis_end(&_nis_state);
}
/*ARGSUSED*/
static int
_nis_getusershell(void *nsrv, void *nscb, va_list ap)
{
char **retval = va_arg(ap, char **);
char *key, *data;
int keylen, datalen, rv, nisr;
_DIAGASSERT(retval != NULL);
*retval = NULL;
if (_nis_state.done) /* exhausted search */
return NS_NOTFOUND;
if (_nis_state.domain == NULL) {
/* only start if NIS not setup */
rv = _nis_start(&_nis_state);
if (rv != NS_SUCCESS)
return rv;
}
key = NULL;
data = NULL;
rv = NS_NOTFOUND;
if (_nis_state.current) { /* already searching */
nisr = yp_next(_nis_state.domain, "shells",
_nis_state.current, _nis_state.currentlen,
&key, &keylen, &data, &datalen);
free(_nis_state.current);
_nis_state.current = NULL;
switch (nisr) {
case 0:
_nis_state.current = key;
_nis_state.currentlen = keylen;
key = NULL;
break;
case YPERR_NOMORE:
rv = NS_NOTFOUND;
goto nisent_out;
default:
rv = NS_UNAVAIL;
goto nisent_out;
}
} 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 */
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 */
/*
* public functions
*/
void
endusershell(void)
{
static const ns_dtab dtab[] = {
NS_FILES_CB(_files_endusershell, NULL)
NS_DNS_CB(_dns_endusershell, NULL)
NS_NIS_CB(_nis_endusershell, NULL)
NS_NULL_CB
};
mutex_lock(&__shellmutex);
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)
NS_NULL_CB
};
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) {
retval = __UNCONST(*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)
NS_NULL_CB
};
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);
}