1/*	$NetBSD: check_bound.c,v 1.1 2010/07/26 15:53:00 pooka Exp $	*/
2
3/*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part.  Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California  94043
30 */
31/*
32 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
33 */
34
35/* #ident	"@(#)check_bound.c	1.15	93/07/05 SMI" */
36
37#if 0
38#ifndef lint
39static	char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro";
40#endif
41#endif
42
43/*
44 * check_bound.c
45 * Checks to see whether the program is still bound to the
46 * claimed address and returns the univeral merged address
47 *
48 */
49
50#include <sys/types.h>
51#include <sys/socket.h>
52#include <rpc/rpc.h>
53#include <stdio.h>
54#include <netconfig.h>
55#include <syslog.h>
56#include <string.h>
57#include <unistd.h>
58#include <stdlib.h>
59
60#include <rump/rump.h>
61#include <rump/rump_syscalls.h>
62
63#include "rpcbind.h"
64
65struct fdlist {
66	int fd;
67	struct netconfig *nconf;
68	struct fdlist *next;
69	int check_binding;
70};
71
72static struct fdlist *fdhead;	/* Link list of the check fd's */
73static struct fdlist *fdtail;
74static const char emptystring[] = "";
75
76static bool_t check_bound(struct fdlist *, const char *uaddr);
77
78/*
79 * Returns 1 if the given address is bound for the given addr & transport
80 * For all error cases, we assume that the address is bound
81 * Returns 0 for success.
82 */
83static bool_t
84check_bound(struct fdlist *fdl, const char *uaddr)
85{
86	int fd;
87	struct netbuf *na;
88	int ans;
89
90	if (fdl->check_binding == FALSE)
91		return (TRUE);
92
93	na = uaddr2taddr(fdl->nconf, uaddr);
94	if (!na)
95		return (TRUE); /* punt, should never happen */
96
97	fd = __rpc_nconf2fd(fdl->nconf);
98	if (fd < 0) {
99		free(na);
100		return (TRUE);
101	}
102
103	ans = bind(fd, (struct sockaddr *)na->buf, na->len);
104
105	rump_sys_close(fd);
106	free(na);
107
108	return (ans == 0 ? FALSE : TRUE);
109}
110
111int
112add_bndlist(struct netconfig *nconf, struct netbuf *baddr)
113{
114	struct fdlist *fdl;
115	struct netconfig *newnconf;
116
117	newnconf = getnetconfigent(nconf->nc_netid);
118	if (newnconf == NULL)
119		return (-1);
120	fdl = (struct fdlist *)malloc((u_int)sizeof (struct fdlist));
121	if (fdl == NULL) {
122		freenetconfigent(newnconf);
123		syslog(LOG_ERR, "no memory!");
124		return (-1);
125	}
126	fdl->nconf = newnconf;
127	fdl->next = NULL;
128	if (fdhead == NULL) {
129		fdhead = fdl;
130		fdtail = fdl;
131	} else {
132		fdtail->next = fdl;
133		fdtail = fdl;
134	}
135	/* XXX no bound checking for now */
136	fdl->check_binding = FALSE;
137
138	return 0;
139}
140
141bool_t
142is_bound(const char *netid, const char *uaddr)
143{
144	struct fdlist *fdl;
145
146	for (fdl = fdhead; fdl; fdl = fdl->next)
147		if (strcmp(fdl->nconf->nc_netid, netid) == 0)
148			break;
149	if (fdl == NULL)
150		return (TRUE);
151	return (check_bound(fdl, uaddr));
152}
153
154/*
155 * Returns NULL if there was some system error.
156 * Returns "" if the address was not bound, i.e the server crashed.
157 * Returns the merged address otherwise.
158 */
159char *
160mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr)
161{
162	struct fdlist *fdl;
163	char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL;
164
165	for (fdl = fdhead; fdl; fdl = fdl->next)
166		if (strcmp(fdl->nconf->nc_netid, netid) == 0)
167			break;
168	if (fdl == NULL)
169		return (NULL);
170	if (check_bound(fdl, uaddr) == FALSE)
171		/* that server died */
172		return strdup(emptystring);
173	/*
174	 * If saddr is not NULL, the remote client may have included the
175	 * address by which it contacted us.  Use that for the "client" uaddr,
176	 * otherwise use the info from the SVCXPRT.
177	 */
178	if (saddr != NULL) {
179		c_uaddr = saddr;
180	} else {
181		c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt));
182		if (c_uaddr == NULL) {
183			syslog(LOG_ERR, "taddr2uaddr failed for %s",
184				fdl->nconf->nc_netid);
185			return (NULL);
186		}
187		allocated_uaddr = c_uaddr;
188	}
189
190#ifdef RPCBIND_DEBUG
191	if (debugging) {
192		if (saddr == NULL) {
193			fprintf(stderr, "mergeaddr: client uaddr = %s\n",
194			    c_uaddr);
195		} else {
196			fprintf(stderr, "mergeaddr: contact uaddr = %s\n",
197			    c_uaddr);
198		}
199	}
200#endif
201	s_uaddr = uaddr;
202	/*
203	 * This is all we should need for IP 4 and 6
204	 */
205	m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid);
206#ifdef RPCBIND_DEBUG
207	if (debugging)
208		fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n",
209				uaddr, m_uaddr);
210#endif
211	if (allocated_uaddr != NULL)
212		free(allocated_uaddr);
213	return (m_uaddr);
214}
215
216/*
217 * Returns a netconf structure from its internal list.  This
218 * structure should not be freed.
219 */
220struct netconfig *
221rpcbind_get_conf(const char *netid)
222{
223	struct fdlist *fdl;
224
225	for (fdl = fdhead; fdl; fdl = fdl->next)
226		if (strcmp(fdl->nconf->nc_netid, netid) == 0)
227			break;
228	if (fdl == NULL)
229		return (NULL);
230	return (fdl->nconf);
231}
232