/* $NetBSD: warmstart.c,v 1.8 2017/08/17 00:08:10 ginsbach Exp $ */

/* $NetBSD: warmstart.c,v 1.8 2017/08/17 00:08:10 ginsbach Exp $ */
/* $FreeBSD: head/usr.sbin/rpcbind/warmstart.c 258564 2013-11-25 16:44:02Z hrs $*/

/*-
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* warmstart.c
* Allows for gathering of registrations from an earlier dumped file.
*
* Copyright (c) 1990 by Sun Microsystems, Inc.
*/

#ident "@(#)warmstart.c 1.7 93/07/05 SMI"

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <err.h>
#include <paths.h>
#include <rpc/rpc.h>
#include <rpc/rpcb_prot.h>
#include <rpc/xdr.h>
#ifdef PORTMAP
#include <netinet/in.h>
#include <rpc/pmap_prot.h>
#endif
#include <syslog.h>
#include <unistd.h>

#include "rpcbind.h"

/*
* XXX this code is unsafe and is not used. It should be made safe.
*/
#ifdef WARMSTART

/* These files keep the pmap_list and rpcb_list in XDR format */
#define RPCBFILE _PATH_VARRUN "rpcbind.file"
#ifdef PORTMAP
#define PMAPFILE _PATH_VARRUN "portmap.file"
#endif

static bool_t write_struct(const char *, xdrproc_t, void *);
static bool_t read_struct(const char *, xdrproc_t, void *);

static bool_t
write_struct(const char *filename, xdrproc_t structproc, void *list)
{
FILE *fp;
int fd;
XDR xdrs;

(void)unlink(filename);
fd = open(filename, O_WRONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) {
syslog(LOG_ERR, "Cannot open `%s' (%m)", filename);
syslog(LOG_ERR, "Cannot save any registration");
return FALSE;
}

xdrstdio_create(&xdrs, fp, XDR_ENCODE);

if (structproc(&xdrs, list) == FALSE) {
syslog(LOG_ERR, "xdr_%s: failed", filename);
(void)fclose(fp);
return (FALSE);
}
XDR_DESTROY(&xdrs);
(void)fclose(fp);
return TRUE;
}

static bool_t
read_struct(const char *filename, xdrproc_t structproc, void *list)
{
FILE *fp;
XDR xdrs;
struct stat sbuf;

if (stat(filename, &sbuf) != 0) {
warn("Cannot stat `%s'", filename);
goto error;
}
if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
(sbuf.st_mode & S_IRWXO)) {
warnx("Invalid permissions on `%s'", filename);
goto error;
}
fp = fopen(filename, "r");
if (fp == NULL) {
warn("cannot open `%s'", filename);
goto error;
}
xdrstdio_create(&xdrs, fp, XDR_DECODE);

if (structproc(&xdrs, list) == FALSE) {
warnx("xdr_%s failed", filename);
(void)fclose(fp);
goto error;
}
XDR_DESTROY(&xdrs);
(void)fclose(fp);
return TRUE;

error: warnx("Will start from scratch");
return FALSE;
}

void
write_warmstart(void)
{
(void)write_struct(RPCBFILE, (xdrproc_t) xdr_rpcblist_ptr, &list_rbl);
#ifdef PORTMAP
(void)write_struct(PMAPFILE, (xdrproc_t) xdr_pmaplist_ptr, &list_pml);
#endif

}

void
read_warmstart(void)
{
rpcblist_ptr tmp_rpcbl = NULL;
#ifdef PORTMAP
struct pmaplist *tmp_pmapl = NULL;
#endif
int ok1, ok2 = TRUE;

ok1 = read_struct(RPCBFILE, (xdrproc_t) xdr_rpcblist_ptr, &tmp_rpcbl);
if (ok1 == FALSE)
return;
#ifdef PORTMAP
ok2 = read_struct(PMAPFILE, (xdrproc_t) xdr_pmaplist_ptr, &tmp_pmapl);
#endif
if (ok2 == FALSE) {
xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
return;
}
xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
list_rbl = tmp_rpcbl;
#ifdef PORTMAP
xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
list_pml = tmp_pmapl;
#endif
}
#endif