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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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* getpwent.c
*
* lib/nsswitch/compat/getpwent.c -- name-service-switch backend for getpwnam()
* et al that does 4.x compatibility. It looks in /etc/passwd; if it finds
* passwd entries there that begin with "+" or "-", it consults other
* services. By default it uses NIS (YP), but the user can override this
* with a "passwd_compat" entry in /etc/nsswitch.conf, e.g.
* passwd_compat: nisplus
*
* This code tries to produce the same results as the 4.x code, even when
* the latter seems ill thought-out (mostly in the handling of netgroups,
* "-", and the combination thereof). Bug-compatible, in other words.
* Though we do try to be more reasonable about the format of "+" and "-"
* entries here, i.e. you don't have to pad them with spurious colons and
* bogus uid/gid values.
*
* Caveats:
* - More than one source may be specified, with the usual switch semantics,
* but having multiple sources here is definitely odd.
* - People who recursively specify "compat" deserve what they get.
* - Entries that begin with "+@" or "-@" are interpreted using
* getnetgrent() and innetgr(), which use the "netgroup" entry in
* /etc/nsswitch.conf. If the sources for "passwd_compat" and "netgroup"
* differ, everything should work fine, but the semantics will be pretty
* confusing.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <pwd.h>
#include <shadow.h> /* For PASSWD (pathname to passwd file) */
#include <stdlib.h>
#include <strings.h>
#include "compat_common.h"
static DEFINE_NSS_DB_ROOT(db_root);
static void
_nss_initf_passwd_compat(p)
nss_db_params_t *p;
{
p->name = NSS_DBNAM_PASSWD;
p->config_name = NSS_DBNAM_PASSWD_COMPAT;
p->default_config = NSS_DEFCONF_PASSWD_COMPAT;
}
static const char *
get_pwname(argp)
nss_XbyY_args_t *argp;
{
struct passwd *p = (struct passwd *)argp->returnval;
return (p->pw_name);
}
static int
check_pwname(argp)
nss_XbyY_args_t *argp;
{
struct passwd *p = (struct passwd *)argp->returnval;
return (strcmp(p->pw_name, argp->key.name) == 0);
}
static nss_status_t
getbyname(be, a)
compat_backend_ptr_t be;
void *a;
{
nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
return (_nss_compat_XY_all(be, argp,
check_pwname, NSS_DBOP_PASSWD_BYNAME));
}
static int
check_pwuid(argp)
nss_XbyY_args_t *argp;
{
struct passwd *p = (struct passwd *)argp->returnval;
return (p->pw_uid == argp->key.uid);
}
static nss_status_t
getbyuid(be, a)
compat_backend_ptr_t be;
void *a;
{
nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
return (_nss_compat_XY_all(be, argp,
check_pwuid, NSS_DBOP_PASSWD_BYUID));
}
/*ARGSUSED*/
static int
merge_pwents(be, argp, fields)
compat_backend_ptr_t be;
nss_XbyY_args_t *argp;
const char **fields;
{
struct passwd *pw = (struct passwd *)argp->buf.result;
char *buf = malloc(NSS_LINELEN_PASSWD);
char *s;
int parsestat;
int len;
int buflen;
if (buf == 0) {
return (NSS_STR_PARSE_PARSE);
/* Really "out of memory", but PARSE_PARSE will have to do */
}
/*
* Don't allow overriding of
* - username
* - uid
* - gid
* That's what the SunOS 4.x code did; who are we to question it...
*/
s = buf;
buflen = argp->buf.buflen;
if (fields[1] != 0)
len = snprintf(s, buflen, "%s:%s",
pw->pw_name, fields[1]);
else {
/* ====> Does this do the right thing? */
if (pw->pw_age != 0 && *pw->pw_age != '\0')
len = snprintf(s, buflen, "%s:%s,%s",
pw->pw_name, pw->pw_passwd, pw->pw_age);
else
len = snprintf(s, buflen, "%s:%s",
pw->pw_name, pw->pw_passwd);
}
if (len > buflen)
return (NSS_STR_PARSE_ERANGE);
s += len;
buflen -= len;
len = snprintf(s, buflen, ":%ld:%ld:%s:%s:%s",
pw->pw_uid,
pw->pw_gid,
fields[4] != 0 ? fields[4] : pw->pw_gecos,
fields[5] != 0 ? fields[5] : pw->pw_dir,
fields[6] != 0 ? fields[6] : pw->pw_shell);
if (len > buflen)
return (NSS_STR_PARSE_ERANGE);
s += len;
len = s - buf;
/*
* if asked, return the data in /etc file format
*/
if (be->return_string_data == 1) {
/* reset the result ptr to the original value */
argp->buf.result = NULL;
if (len > argp->buf.buflen) {
parsestat = NSS_STR_PARSE_ERANGE;
} else {
(void) strncpy(argp->buf.buffer, buf, len);
argp->returnval = argp->buf.buffer;
argp->returnlen = len;
parsestat = NSS_SUCCESS;
}
} else {
parsestat = (*argp->str2ent)(buf, len,
argp->buf.result,
argp->buf.buffer,
argp->buf.buflen);
}
free(buf);
return (parsestat);
}
static compat_backend_op_t passwd_ops[] = {
_nss_compat_destr,
_nss_compat_endent,
_nss_compat_setent,
_nss_compat_getent,
getbyname,
getbyuid
};
/*ARGSUSED*/
nss_backend_t *
_nss_compat_passwd_constr(dummy1, dummy2, dummy3)
const char *dummy1, *dummy2, *dummy3;
{
return (_nss_compat_constr(passwd_ops,
sizeof (passwd_ops) / sizeof (passwd_ops[0]),
PASSWD,
NSS_LINELEN_PASSWD,
&db_root,
_nss_initf_passwd_compat,
1,
get_pwname,
merge_pwents));
}
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