/* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
/*
* Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
*/
/* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */
#if 0
#ifndef lint
static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro";
#endif
#endif
/*
* check_bound.c
* Checks to see whether the program is still bound to the
* claimed address and returns the universal merged address
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <rpc/rpc.h>
#include <rpc/svc_dg.h>
#include <netconfig.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "rpcbind.h"
struct fdlist {
int fd;
struct netconfig *nconf;
struct fdlist *next;
int check_binding;
};
static struct fdlist *fdhead; /* Link list of the check fd's */
static struct fdlist *fdtail;
static char *nullstring = "";
static bool_t check_bound(struct fdlist *, char *uaddr);
/*
* Returns 1 if the given address is bound for the given addr & transport
* For all error cases, we assume that the address is bound
* Returns 0 for success.
*/
static bool_t
check_bound(struct fdlist *fdl, char *uaddr)
{
int fd;
struct netbuf *na;
int ans;
if (fdl->check_binding == FALSE)
return (TRUE);
na = uaddr2taddr(fdl->nconf, uaddr);
if (!na)
return (TRUE); /* punt, should never happen */
fd = __rpc_nconf2fd(fdl->nconf);
if (fd < 0) {
free(na->buf);
free(na);
return (TRUE);
}
ans = bind(fd, (struct sockaddr *)na->buf, na->len);
close(fd);
free(na->buf);
free(na);
return (ans == 0 ? FALSE : TRUE);
}
int
add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused)
{
struct fdlist *fdl;
struct netconfig *newnconf;
newnconf = getnetconfigent(nconf->nc_netid);
if (newnconf == NULL)
return (-1);
fdl = malloc(sizeof (struct fdlist));
if (fdl == NULL) {
freenetconfigent(newnconf);
syslog(LOG_ERR, "no memory!");
return (-1);
}
fdl->nconf = newnconf;
fdl->next = NULL;
if (fdhead == NULL) {
fdhead = fdl;
fdtail = fdl;
} else {
fdtail->next = fdl;
fdtail = fdl;
}
/* XXX no bound checking for now */
fdl->check_binding = FALSE;
return 0;
}
bool_t
is_bound(char *netid, char *uaddr)
{
struct fdlist *fdl;
for (fdl = fdhead; fdl; fdl = fdl->next)
if (strcmp(fdl->nconf->nc_netid, netid) == 0)
break;
if (fdl == NULL)
return (TRUE);
return (check_bound(fdl, uaddr));
}
/*
* Returns NULL if there was some system error.
* Returns "" if the address was not bound, i.e the server crashed.
* Returns the merged address otherwise.
*/
char *
mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr)
{
struct fdlist *fdl;
struct netbuf *callee;
char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL;
for (fdl = fdhead; fdl; fdl = fdl->next)
if (strcmp(fdl->nconf->nc_netid, netid) == 0)
break;
if (fdl == NULL)
return (NULL);
if (check_bound(fdl, uaddr) == FALSE)
/* that server died */
return (nullstring);
/*
* Try to determine the local address on which the client contacted us,
* so we can send a reply from the same address. If it's unknown, then
* try to determine which address the client used, and pick a nearby
* local address.
*
* If saddr is not NULL, the remote client may have included the
* address by which it contacted us. Use that for the "client" uaddr,
* otherwise use the info from the SVCXPRT.
*/
callee = svc_getrpccallee(xprt);
if (callee != NULL && callee->buf != NULL) {
c_uaddr = taddr2uaddr(fdl->nconf, callee);
allocated_uaddr = c_uaddr;
} else if (saddr != NULL) {
c_uaddr = saddr;
} else {
c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt));
allocated_uaddr = c_uaddr;
}
if (c_uaddr == NULL) {
syslog(LOG_ERR, "taddr2uaddr failed for %s",
fdl->nconf->nc_netid);
return (NULL);
}
#ifdef ND_DEBUG
if (debugging) {
if (saddr == NULL) {
fprintf(stderr, "mergeaddr: client uaddr = %s\n",
c_uaddr);
} else {
fprintf(stderr, "mergeaddr: contact uaddr = %s\n",
c_uaddr);
}
}
#endif
s_uaddr = uaddr;
/*
* This is all we should need for IP 4 and 6
*/
m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid);
#ifdef ND_DEBUG
if (debugging)
fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n",
uaddr, m_uaddr);
#endif
free(allocated_uaddr);
return (m_uaddr);
}
/*
* Returns a netconf structure from its internal list. This
* structure should not be freed.
*/
struct netconfig *
rpcbind_get_conf(const char *netid)
{
struct fdlist *fdl;
for (fdl = fdhead; fdl; fdl = fdl->next)
if (strcmp(fdl->nconf->nc_netid, netid) == 0)
break;
if (fdl == NULL)
return (NULL);
return (fdl->nconf);
}
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