243 lines
6.2 KiB
C
243 lines
6.2 KiB
C
/* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */
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/* $FreeBSD$ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
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*/
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/* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro";
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#endif
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#endif
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/*
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* check_bound.c
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* Checks to see whether the program is still bound to the
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* claimed address and returns the universal merged address
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*
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <rpc/rpc.h>
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#include <rpc/svc_dg.h>
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#include <netconfig.h>
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#include <syslog.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "rpcbind.h"
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struct fdlist {
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int fd;
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struct netconfig *nconf;
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struct fdlist *next;
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int check_binding;
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};
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static struct fdlist *fdhead; /* Link list of the check fd's */
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static struct fdlist *fdtail;
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static char *nullstring = "";
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static bool_t check_bound(struct fdlist *, char *uaddr);
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/*
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* Returns 1 if the given address is bound for the given addr & transport
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* For all error cases, we assume that the address is bound
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* Returns 0 for success.
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*/
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static bool_t
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check_bound(struct fdlist *fdl, char *uaddr)
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{
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int fd;
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struct netbuf *na;
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int ans;
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if (fdl->check_binding == FALSE)
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return (TRUE);
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na = uaddr2taddr(fdl->nconf, uaddr);
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if (!na)
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return (TRUE); /* punt, should never happen */
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fd = __rpc_nconf2fd(fdl->nconf);
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if (fd < 0) {
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free(na->buf);
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free(na);
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return (TRUE);
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}
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ans = bind(fd, (struct sockaddr *)na->buf, na->len);
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close(fd);
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free(na->buf);
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free(na);
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return (ans == 0 ? FALSE : TRUE);
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}
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int
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add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused)
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{
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struct fdlist *fdl;
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struct netconfig *newnconf;
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newnconf = getnetconfigent(nconf->nc_netid);
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if (newnconf == NULL)
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return (-1);
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fdl = malloc(sizeof (struct fdlist));
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if (fdl == NULL) {
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freenetconfigent(newnconf);
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syslog(LOG_ERR, "no memory!");
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return (-1);
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}
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fdl->nconf = newnconf;
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fdl->next = NULL;
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if (fdhead == NULL) {
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fdhead = fdl;
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fdtail = fdl;
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} else {
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fdtail->next = fdl;
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fdtail = fdl;
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}
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/* XXX no bound checking for now */
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fdl->check_binding = FALSE;
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return 0;
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}
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bool_t
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is_bound(char *netid, char *uaddr)
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{
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struct fdlist *fdl;
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for (fdl = fdhead; fdl; fdl = fdl->next)
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if (strcmp(fdl->nconf->nc_netid, netid) == 0)
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break;
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if (fdl == NULL)
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return (TRUE);
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return (check_bound(fdl, uaddr));
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}
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/*
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* Returns NULL if there was some system error.
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* Returns "" if the address was not bound, i.e the server crashed.
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* Returns the merged address otherwise.
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*/
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char *
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mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr)
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{
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struct fdlist *fdl;
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struct svc_dg_data *dg_data;
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char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL;
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for (fdl = fdhead; fdl; fdl = fdl->next)
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if (strcmp(fdl->nconf->nc_netid, netid) == 0)
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break;
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if (fdl == NULL)
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return (NULL);
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if (check_bound(fdl, uaddr) == FALSE)
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/* that server died */
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return (nullstring);
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/*
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* Try to determine the local address on which the client contacted us,
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* so we can send a reply from the same address. If it's unknown, then
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* try to determine which address the client used, and pick a nearby
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* local address.
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*
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* If saddr is not NULL, the remote client may have included the
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* address by which it contacted us. Use that for the "client" uaddr,
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* otherwise use the info from the SVCXPRT.
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*/
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dg_data = (struct svc_dg_data*)xprt->xp_p2;
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if (dg_data != NULL && dg_data->su_srcaddr.buf != NULL) {
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c_uaddr = taddr2uaddr(fdl->nconf, &dg_data->su_srcaddr);
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allocated_uaddr = c_uaddr;
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}
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else if (saddr != NULL) {
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c_uaddr = saddr;
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} else {
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c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt));
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allocated_uaddr = c_uaddr;
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}
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if (c_uaddr == NULL) {
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syslog(LOG_ERR, "taddr2uaddr failed for %s",
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fdl->nconf->nc_netid);
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return (NULL);
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}
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#ifdef ND_DEBUG
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if (debugging) {
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if (saddr == NULL) {
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fprintf(stderr, "mergeaddr: client uaddr = %s\n",
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c_uaddr);
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} else {
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fprintf(stderr, "mergeaddr: contact uaddr = %s\n",
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c_uaddr);
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}
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}
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#endif
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s_uaddr = uaddr;
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/*
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* This is all we should need for IP 4 and 6
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*/
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m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid);
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#ifdef ND_DEBUG
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if (debugging)
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fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n",
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uaddr, m_uaddr);
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#endif
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free(allocated_uaddr);
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return (m_uaddr);
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}
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/*
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* Returns a netconf structure from its internal list. This
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* structure should not be freed.
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*/
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struct netconfig *
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rpcbind_get_conf(const char *netid)
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{
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struct fdlist *fdl;
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for (fdl = fdhead; fdl; fdl = fdl->next)
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if (strcmp(fdl->nconf->nc_netid, netid) == 0)
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break;
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if (fdl == NULL)
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return (NULL);
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return (fdl->nconf);
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}
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