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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* getnetgrent.c
*
* - name-service switch frontend routines for the netgroup API.
*
* Policy decision:
* If netgroup A refers to netgroup B, both must occur in the same
* source (any other choice gives very confusing semantics). This
* assumption is deeply embedded in the code below and in the backends.
*
* innetgr() is implemented on top of something called __multi_innetgr(),
* which replaces each (char *) argument of innetgr() with a counted vector
* of (char *). The semantics are the same as an OR of the results of
* innetgr() operations on each possible 4-tuple picked from the arguments,
* but it's possible to implement some cases more efficiently. This is
* important for mountd, which used to read YP netgroup.byhost directly in
* order to determine efficiently whether a given host belonged to any one
* of a long list of netgroups. Wildcarded arguments are indicated by a
* count of zero.
*/
#include "lint.h"
#include <string.h>
#include <synch.h>
#include <nss_dbdefs.h>
#include <mtlib.h>
#include <libc.h>
static DEFINE_NSS_DB_ROOT(db_root);
void
_nss_initf_netgroup(p)
nss_db_params_t *p;
{
p->name = NSS_DBNAM_NETGROUP;
p->default_config = NSS_DEFCONF_NETGROUP;
}
/*
* The netgroup routines aren't quite like the majority of the switch clients.
* innetgr() more-or-less fits the getXXXbyYYY mould, but for the others:
* - setnetgrent("netgroup") is really a getXXXbyYYY routine, i.e. it
* searches the sources until it finds an entry with the given name.
* Rather than returning the (potentially large) entry, it simply
* initializes a cursor, and then...
* - getnetgrent(...) is repeatedly invoked by the user to extract the
* contents of the entry found by setnetgrent().
* - endnetgrent() is almost like a real endXXXent routine.
* The behaviour in NSS was:
* If we were certain that all the backends could provide netgroup information
* in a common form, we could make the setnetgrent() backend return the entire
* entry to the frontend, then implement getnetgrent() and endnetgrent()
* strictly in the frontend (aka here). But we're not certain, so we won't.
* In NSS2:
* Since nscd returns the results, and it is nscd that accumulates
* the results, then we can return the entire result on the setnetgrent.
*
* NOTE:
* In the SunOS 4.x (YP) version of this code, innetgr() did not
* affect the state of {set,get,end}netgrent(). Somewhere out
* there probably lurks a program that depends on this behaviour,
* so this version (both frontend and backends) had better
* behave the same way.
*/
/* ===> ?? fix "__" name */
int
__multi_innetgr(ngroup, pgroup,
nhost, phost,
nuser, puser,
ndomain, pdomain)
nss_innetgr_argc ngroup, nhost, nuser, ndomain;
nss_innetgr_argv pgroup, phost, puser, pdomain;
{
struct nss_innetgr_args ia;
if (ngroup == 0) {
return (0); /* One thing fewer to worry backends */
}
ia.groups.argc = ngroup;
ia.groups.argv = pgroup;
ia.arg[NSS_NETGR_MACHINE].argc = nhost;
ia.arg[NSS_NETGR_MACHINE].argv = phost;
ia.arg[NSS_NETGR_USER].argc = nuser;
ia.arg[NSS_NETGR_USER].argv = puser;
ia.arg[NSS_NETGR_DOMAIN].argc = ndomain;
ia.arg[NSS_NETGR_DOMAIN].argv = pdomain;
ia.status = NSS_NETGR_NO;
(void) nss_search(&db_root, _nss_initf_netgroup,
NSS_DBOP_NETGROUP_IN, &ia);
return (ia.status == NSS_NETGR_FOUND);
}
int
innetgr(group, host, user, domain)
const char *group, *host, *user, *domain;
{
#define IA(charp) \
(nss_innetgr_argc)((charp) != 0), (nss_innetgr_argv)(&(charp))
return (__multi_innetgr(IA(group), IA(host), IA(user), IA(domain)));
}
/*
* Context for setnetgrent()/getnetgrent(). If the user is being sensible
* the requests will be serialized anyway, but let's play safe and
* serialize them ourselves (anything to prevent a coredump)...
* We can't use lmutex_lock() here because we don't know what the backends
* that we call may call in turn. They might call malloc()/free().
* So we use the brute-force callout_lock_enter() instead.
*/
static nss_backend_t *getnetgrent_backend;
int
setnetgrent(const char *netgroup)
{
nss_backend_t *be;
if (netgroup == NULL) {
/* Prevent coredump, otherwise don't do anything profound */
netgroup = "";
}
callout_lock_enter();
be = getnetgrent_backend;
if (be != NULL && NSS_INVOKE_DBOP(be, NSS_DBOP_SETENT,
(void *)netgroup) != NSS_SUCCESS) {
(void) NSS_INVOKE_DBOP(be, NSS_DBOP_DESTRUCTOR, 0);
be = NULL;
}
if (be == NULL) {
struct nss_setnetgrent_args args;
args.netgroup = netgroup;
args.iterator = 0;
(void) nss_search(&db_root, _nss_initf_netgroup,
NSS_DBOP_NETGROUP_SET, &args);
be = args.iterator;
}
getnetgrent_backend = be;
callout_lock_exit();
return (0);
}
int
getnetgrent_r(machinep, namep, domainp, buffer, buflen)
char **machinep;
char **namep;
char **domainp;
char *buffer;
int buflen;
{
struct nss_getnetgrent_args args;
args.buffer = buffer;
args.buflen = buflen;
args.status = NSS_NETGR_NO;
callout_lock_enter();
if (getnetgrent_backend != 0) {
(void) NSS_INVOKE_DBOP(getnetgrent_backend,
NSS_DBOP_GETENT, &args);
}
callout_lock_exit();
if (args.status == NSS_NETGR_FOUND) {
*machinep = args.retp[NSS_NETGR_MACHINE];
*namep = args.retp[NSS_NETGR_USER];
*domainp = args.retp[NSS_NETGR_DOMAIN];
return (1);
} else {
return (0);
}
}
static nss_XbyY_buf_t *buf;
int
getnetgrent(machinep, namep, domainp)
char **machinep;
char **namep;
char **domainp;
{
(void) NSS_XbyY_ALLOC(&buf, 0, NSS_BUFLEN_NETGROUP);
return (getnetgrent_r(machinep, namep, domainp,
buf->buffer, buf->buflen));
}
int
endnetgrent()
{
callout_lock_enter();
if (getnetgrent_backend != 0) {
(void) NSS_INVOKE_DBOP(getnetgrent_backend,
NSS_DBOP_DESTRUCTOR, 0);
getnetgrent_backend = 0;
}
callout_lock_exit();
nss_delete(&db_root); /* === ? */
NSS_XbyY_FREE(&buf);
return (0);
}
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