1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30/*
31 * warmstart.c
32 * Allows for gathering of registrations from an earlier dumped file.
33 *
34 * Copyright (c) 1990 by Sun Microsystems, Inc.
35 */
36
37/*
38 * #ident	"@(#)warmstart.c	1.7	93/07/05 SMI"
39 * $FreeBSD$/
40 */
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <stdio.h>
44#include <rpc/rpc.h>
45#include <rpc/rpcb_prot.h>
46#include <rpc/xdr.h>
47#ifdef PORTMAP
48#include <netinet/in.h>
49#include <rpc/pmap_prot.h>
50#endif
51#include <syslog.h>
52#include <unistd.h>
53
54#include "rpcbind.h"
55
56/*
57 * XXX this code is unsafe and is not used. It should be made safe.
58 */
59
60
61/* These files keep the pmap_list and rpcb_list in XDR format */
62#define	RPCBFILE	"/tmp/rpcbind.file"
63#ifdef PORTMAP
64#define	PMAPFILE	"/tmp/portmap.file"
65#endif
66
67static bool_t write_struct(char *, xdrproc_t, void *);
68static bool_t read_struct(char *, xdrproc_t, void *);
69
70static bool_t
71write_struct(char *filename, xdrproc_t structproc, void *list)
72{
73	FILE *fp;
74	XDR xdrs;
75	mode_t omask;
76
77	omask = umask(077);
78	fp = fopen(filename, "w");
79	if (fp == NULL) {
80		int i;
81
82		for (i = 0; i < 10; i++)
83			close(i);
84		fp = fopen(filename, "w");
85		if (fp == NULL) {
86			syslog(LOG_ERR,
87				"cannot open file = %s for writing", filename);
88			syslog(LOG_ERR, "cannot save any registration");
89			return (FALSE);
90		}
91	}
92	(void) umask(omask);
93	xdrstdio_create(&xdrs, fp, XDR_ENCODE);
94
95	if (structproc(&xdrs, list) == FALSE) {
96		syslog(LOG_ERR, "rpcbind: xdr_%s: failed", filename);
97		fclose(fp);
98		return (FALSE);
99	}
100	XDR_DESTROY(&xdrs);
101	fclose(fp);
102	return (TRUE);
103}
104
105static bool_t
106read_struct(char *filename, xdrproc_t structproc, void *list)
107{
108	FILE *fp;
109	XDR xdrs;
110	struct stat sbuf;
111
112	if (stat(filename, &sbuf) != 0) {
113		fprintf(stderr,
114		"rpcbind: cannot stat file = %s for reading\n", filename);
115		goto error;
116	}
117	if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
118	    (sbuf.st_mode & S_IRWXO)) {
119		fprintf(stderr,
120		"rpcbind: invalid permissions on file = %s for reading\n",
121			filename);
122		goto error;
123	}
124	fp = fopen(filename, "r");
125	if (fp == NULL) {
126		fprintf(stderr,
127		"rpcbind: cannot open file = %s for reading\n", filename);
128		goto error;
129	}
130	xdrstdio_create(&xdrs, fp, XDR_DECODE);
131
132	if (structproc(&xdrs, list) == FALSE) {
133		fprintf(stderr, "rpcbind: xdr_%s: failed\n", filename);
134		fclose(fp);
135		goto error;
136	}
137	XDR_DESTROY(&xdrs);
138	fclose(fp);
139	return (TRUE);
140
141error:	fprintf(stderr, "rpcbind: will start from scratch\n");
142	return (FALSE);
143}
144
145void
146write_warmstart(void)
147{
148	(void) write_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &list_rbl);
149#ifdef PORTMAP
150	(void) write_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &list_pml);
151#endif
152
153}
154
155void
156read_warmstart(void)
157{
158	rpcblist_ptr tmp_rpcbl = NULL;
159#ifdef PORTMAP
160	struct pmaplist *tmp_pmapl = NULL;
161#endif
162	int ok1, ok2 = TRUE;
163
164	ok1 = read_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &tmp_rpcbl);
165	if (ok1 == FALSE)
166		return;
167#ifdef PORTMAP
168	ok2 = read_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &tmp_pmapl);
169#endif
170	if (ok2 == FALSE) {
171		xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
172		return;
173	}
174	xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
175	list_rbl = tmp_rpcbl;
176#ifdef PORTMAP
177	xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
178	list_pml = tmp_pmapl;
179#endif
180}
181