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 */
39#include <sys/types.h>
40#include <sys/stat.h>
41#include <stdio.h>
42#include <rpc/rpc.h>
43#include <rpc/rpcb_prot.h>
44#include <rpc/xdr.h>
45#ifdef PORTMAP
46#include <netinet/in.h>
47#include <rpc/pmap_prot.h>
48#endif
49#include <syslog.h>
50#include <unistd.h>
51
52#include "rpcbind.h"
53
54/*
55 * XXX this code is unsafe and is not used. It should be made safe.
56 */
57
58
59/* These files keep the pmap_list and rpcb_list in XDR format */
60#define	RPCBFILE	"/tmp/rpcbind.file"
61#ifdef PORTMAP
62#define	PMAPFILE	"/tmp/portmap.file"
63#endif
64
65static bool_t write_struct(char *, xdrproc_t, void *);
66static bool_t read_struct(char *, xdrproc_t, void *);
67
68static bool_t
69write_struct(char *filename, xdrproc_t structproc, void *list)
70{
71	FILE *fp;
72	XDR xdrs;
73	mode_t omask;
74
75	omask = umask(077);
76	fp = fopen(filename, "w");
77	if (fp == NULL) {
78		int i;
79
80		for (i = 0; i < 10; i++)
81			close(i);
82		fp = fopen(filename, "w");
83		if (fp == NULL) {
84			syslog(LOG_ERR,
85				"cannot open file = %s for writing", filename);
86			syslog(LOG_ERR, "cannot save any registration");
87			return (FALSE);
88		}
89	}
90	(void) umask(omask);
91	xdrstdio_create(&xdrs, fp, XDR_ENCODE);
92
93	if (structproc(&xdrs, list) == FALSE) {
94		syslog(LOG_ERR, "rpcbind: xdr_%s: failed", filename);
95		fclose(fp);
96		return (FALSE);
97	}
98	XDR_DESTROY(&xdrs);
99	fclose(fp);
100	return (TRUE);
101}
102
103static bool_t
104read_struct(char *filename, xdrproc_t structproc, void *list)
105{
106	FILE *fp;
107	XDR xdrs;
108	struct stat sbuf;
109
110	if (stat(filename, &sbuf) != 0) {
111		fprintf(stderr,
112		"rpcbind: cannot stat file = %s for reading\n", filename);
113		goto error;
114	}
115	if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
116	    (sbuf.st_mode & S_IRWXO)) {
117		fprintf(stderr,
118		"rpcbind: invalid permissions on file = %s for reading\n",
119			filename);
120		goto error;
121	}
122	fp = fopen(filename, "r");
123	if (fp == NULL) {
124		fprintf(stderr,
125		"rpcbind: cannot open file = %s for reading\n", filename);
126		goto error;
127	}
128	xdrstdio_create(&xdrs, fp, XDR_DECODE);
129
130	if (structproc(&xdrs, list) == FALSE) {
131		fprintf(stderr, "rpcbind: xdr_%s: failed\n", filename);
132		fclose(fp);
133		goto error;
134	}
135	XDR_DESTROY(&xdrs);
136	fclose(fp);
137	return (TRUE);
138
139error:	fprintf(stderr, "rpcbind: will start from scratch\n");
140	return (FALSE);
141}
142
143void
144write_warmstart(void)
145{
146	(void) write_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &list_rbl);
147#ifdef PORTMAP
148	(void) write_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &list_pml);
149#endif
150
151}
152
153void
154read_warmstart(void)
155{
156	rpcblist_ptr tmp_rpcbl = NULL;
157#ifdef PORTMAP
158	struct pmaplist *tmp_pmapl = NULL;
159#endif
160	int ok1, ok2 = TRUE;
161
162	ok1 = read_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &tmp_rpcbl);
163	if (ok1 == FALSE)
164		return;
165#ifdef PORTMAP
166	ok2 = read_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &tmp_pmapl);
167#endif
168	if (ok2 == FALSE) {
169		xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
170		return;
171	}
172	xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
173	list_rbl = tmp_rpcbl;
174#ifdef PORTMAP
175	xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
176	list_pml = tmp_pmapl;
177#endif
178}
179