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/*
23 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <stdio.h>
30#include <stdlib.h>
31#include <sys/types.h>
32#include <string.h>
33#include <syslog.h>
34#include <sys/param.h>
35#include <sys/stat.h>
36#include <sys/file.h>
37#include <sys/time.h>
38#include <errno.h>
39#include <rpcsvc/mount.h>
40#include <sys/pathconf.h>
41#include <sys/systeminfo.h>
42#include <sys/utsname.h>
43#include <signal.h>
44#include <locale.h>
45#include <unistd.h>
46#include <thread.h>
47#include <sharefs/share.h>
48#include <sharefs/sharetab.h>
49#include "../lib/sharetab.h"
50#include "mountd.h"
51
52static void freeexports(struct exportnode *);
53static struct groupnode **newgroup(char *, struct groupnode **);
54static struct exportnode **newexport(char *, struct groupnode *,
55						struct exportnode **);
56
57static char *optlist[] = {
58#define	OPT_RO		0
59	SHOPT_RO,
60#define	OPT_RW		1
61	SHOPT_RW,
62	NULL
63};
64
65/*
66 * Send current export list to a client
67 */
68void
69export(struct svc_req *rqstp)
70{
71	SVCXPRT *transp;
72	struct exportnode *exportlist;
73	struct exportnode **tail;
74	struct groupnode *groups;
75	struct groupnode **grtail;
76	struct share *sh;
77	struct sh_list *shp;
78	char *gr, *p, *opts, *val, *lasts;
79
80	int export_to_everyone;
81
82	transp = rqstp->rq_xprt;
83	if (!svc_getargs(transp, xdr_void, NULL)) {
84		svcerr_decode(transp);
85		return;
86	}
87
88	check_sharetab();
89
90	exportlist = NULL;
91	tail = &exportlist;
92
93	(void) rw_rdlock(&sharetab_lock);
94
95	for (shp = share_list; shp; shp = shp->shl_next) {
96
97		groups = NULL;
98		grtail = &groups;
99
100		sh = shp->shl_sh;
101
102		/*
103		 * Check for "ro" or "rw" list without argument values.  This
104		 * indicates export to everyone.  Unfortunately, SunOS 4.x
105		 * automounter uses this, and it is indicated indirectly with
106		 * 'showmount -e'.
107		 *
108		 * If export_to_everyone is 1, then groups should be NULL to
109		 * indicate export to everyone.
110		 */
111
112		opts = strdup(sh->sh_opts);
113		p = opts;
114
115
116		export_to_everyone = 0;
117		while (*p) {
118			switch (getsubopt(&p, optlist, &val)) {
119			case OPT_RO:
120			case OPT_RW:
121				if (val == NULL)
122					export_to_everyone = 1;
123				break;
124			}
125		}
126
127		free(opts);
128
129		if (export_to_everyone == 0) {
130
131			opts = strdup(sh->sh_opts);
132			p = opts;
133
134			/*
135			 * Just concatenate all the hostnames/groups
136			 * from the "ro" and "rw" lists for each flavor.
137			 * This list is rather meaningless now, but
138			 * that's what the protocol demands.
139			 */
140			while (*p) {
141				switch (getsubopt(&p, optlist, &val)) {
142				case OPT_RO:
143				case OPT_RW:
144
145					while ((gr = strtok_r(val, ":", &lasts))
146					    != NULL) {
147						val = NULL;
148						grtail = newgroup(gr, grtail);
149					}
150					break;
151				}
152			}
153
154			free(opts);
155		}
156		tail = newexport(sh->sh_path, groups, tail);
157	}
158
159	(void) rw_unlock(&sharetab_lock);
160
161	errno = 0;
162	if (!svc_sendreply(transp, xdr_exports, (char *)&exportlist))
163		log_cant_reply(transp);
164
165	freeexports(exportlist);
166}
167
168
169static void
170freeexports(struct exportnode *ex)
171{
172	struct groupnode *groups, *tmpgroups;
173	struct exportnode *tmpex;
174
175	while (ex) {
176		groups = ex->ex_groups;
177		while (groups) {
178			tmpgroups = groups->gr_next;
179			free(groups->gr_name);
180			free(groups);
181			groups = tmpgroups;
182		}
183		tmpex = ex->ex_next;
184		free(ex->ex_dir);
185		free(ex);
186		ex = tmpex;
187	}
188}
189
190
191static struct groupnode **
192newgroup(char *grname, struct groupnode **tail)
193{
194	struct groupnode *new;
195	char *newname;
196
197	new = exmalloc(sizeof (*new));
198	newname = exmalloc(strlen(grname) + 1);
199	(void) strcpy(newname, grname);
200
201	new->gr_name = newname;
202	new->gr_next = NULL;
203	*tail = new;
204	return (&new->gr_next);
205}
206
207
208static struct exportnode **
209newexport(char *grname, struct groupnode *grplist, struct exportnode **tail)
210{
211	struct exportnode *new;
212	char *newname;
213
214	new = exmalloc(sizeof (*new));
215	newname = exmalloc(strlen(grname) + 1);
216	(void) strcpy(newname, grname);
217
218	new->ex_dir = newname;
219	new->ex_groups = grplist;
220	new->ex_next = NULL;
221	*tail = new;
222	return (&new->ex_next);
223}
224