getservent_r.c revision 2830:5228d1267a01 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 *
25 * lib/libsocket/inet/getservent_r.c
26 *
27 * This file defines and implements the re-entrant enumeration routines for
28 *   services: setservent(), getservent_r(), and endservent(). They consult
29 *   the switch policy directly and do not "share" their enumeration state
30 *   nor the stayopen flag with the implentation of the more common
31 *   getservbyname_r()/getservbyport_r(). The latter follows a tortuous
32 *   route in order to be consistent with netdir_getbyYY() (see
33 *   getservbyname_r.c and lib/libnsl/nss/netdir_inet.c).
34 */
35
36#pragma ident	"%Z%%M%	%I%	%E% SMI"
37
38#include <sys/types.h>
39#include <nss_dbdefs.h>
40
41/*
42 * str2servent is implemented in libnsl, libnsl/nss/netdir_inet.c, since
43 * the "engine" of the new gethost/getserv/netdir lives in libnsl.
44 */
45int str2servent(const char *, int, void *, char *, int);
46
47/*
48 * Unsynchronized, but it affects only
49 * efficiency, not correctness.
50 */
51static int services_stayopen;
52static DEFINE_NSS_DB_ROOT(db_root);
53static DEFINE_NSS_GETENT(context);
54
55void
56_nss_initf_services(nss_db_params_t *p)
57{
58	p->name	= NSS_DBNAM_SERVICES;
59	p->default_config = NSS_DEFCONF_SERVICES;
60}
61
62int
63setservent(int stay)
64{
65	services_stayopen |= stay;
66	nss_setent(&db_root, _nss_initf_services, &context);
67	return (0);
68}
69
70int
71endservent()
72{
73	services_stayopen = 0;
74	nss_endent(&db_root, _nss_initf_services, &context);
75	nss_delete(&db_root);
76	return (0);
77}
78
79struct servent *
80getservent_r(struct servent *result, char *buffer, int buflen)
81{
82	nss_XbyY_args_t arg;
83	nss_status_t	res;
84
85	NSS_XbyY_INIT(&arg, result, buffer, buflen, str2servent);
86	/*
87	 * Setting proto to NULL here is a bit of a hack since we share
88	 * the parsing code in the NIS+ backend with our getservbyYY()
89	 * brethren who can search on 1-1/2 key. If they pass a NULL
90	 * proto, the parsing code deals with it by picking the protocol
91	 * from the first NIS+ matching object and combining all entries
92	 * with "that" proto field. NIS+ is the only name service, so far,
93	 * that can return multiple entries on a lookup.
94	 */
95	arg.key.serv.proto	= NULL;
96	/* === No stayopen flag;  of course you stay open for iteration */
97	res = nss_getent(&db_root, _nss_initf_services, &context, &arg);
98	arg.status = res;
99	return (struct servent *)NSS_XbyY_FINI(&arg);
100}
101