1 /*
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 * contributors may be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * @(#)check_bound.c 1.15 93/07/05 SMI; 1.11 89/04/21 Copyr 1989 Sun Micro
29 * $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $
30 * $FreeBSD: src/usr.sbin/rpcbind/check_bound.c,v 1.5 2007/11/07 10:53:39 kevlo Exp $
31 */
32 /*
33 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
34 */
35
36 /*
37 * check_bound.c
38 * Checks to see whether the program is still bound to the
39 * claimed address and returns the univeral merged address
40 *
41 */
42
43 #include <sys/types.h>
44 #include <sys/socket.h>
45 #include <rpc/rpc.h>
46 #include <stdio.h>
47 #include <netconfig.h>
48 #include <syslog.h>
49 #include <string.h>
50 #include <unistd.h>
51 #include <stdlib.h>
52
53 #include "rpcbind.h"
54
55 struct fdlist {
56 int fd;
57 struct netconfig *nconf;
58 struct fdlist *next;
59 int check_binding;
60 };
61
62 static struct fdlist *fdhead; /* Link list of the check fd's */
63 static struct fdlist *fdtail;
64 static char *nullstring = "";
65
66 static bool_t check_bound(struct fdlist *, char *uaddr);
67
68 /*
69 * Returns 1 if the given address is bound for the given addr & transport
70 * For all error cases, we assume that the address is bound
71 * Returns 0 for success.
72 */
73 static bool_t
check_bound(struct fdlist * fdl,char * uaddr)74 check_bound(struct fdlist *fdl, char *uaddr)
75 {
76 int fd;
77 struct netbuf *na;
78 int ans;
79
80 if (fdl->check_binding == FALSE)
81 return (TRUE);
82
83 na = uaddr2taddr(fdl->nconf, uaddr);
84 if (!na)
85 return (TRUE); /* punt, should never happen */
86
87 fd = __rpc_nconf2fd(fdl->nconf);
88 if (fd < 0) {
89 free(na->buf);
90 free(na);
91 return (TRUE);
92 }
93
94 ans = bind(fd, (struct sockaddr *)na->buf, na->len);
95
96 close(fd);
97 free(na->buf);
98 free(na);
99
100 return (ans == 0 ? FALSE : TRUE);
101 }
102
103 int
add_bndlist(struct netconfig * nconf,struct netbuf * baddr __unused)104 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused)
105 {
106 struct fdlist *fdl;
107 struct netconfig *newnconf;
108
109 newnconf = getnetconfigent(nconf->nc_netid);
110 if (newnconf == NULL)
111 return (-1);
112 fdl = malloc(sizeof (struct fdlist));
113 if (fdl == NULL) {
114 freenetconfigent(newnconf);
115 syslog(LOG_ERR, "no memory!");
116 return (-1);
117 }
118 fdl->nconf = newnconf;
119 fdl->next = NULL;
120 if (fdhead == NULL) {
121 fdhead = fdl;
122 fdtail = fdl;
123 } else {
124 fdtail->next = fdl;
125 fdtail = fdl;
126 }
127 /* XXX no bound checking for now */
128 fdl->check_binding = FALSE;
129
130 return 0;
131 }
132
133 bool_t
is_bound(char * netid,char * uaddr)134 is_bound(char *netid, char *uaddr)
135 {
136 struct fdlist *fdl;
137
138 for (fdl = fdhead; fdl; fdl = fdl->next)
139 if (strcmp(fdl->nconf->nc_netid, netid) == 0)
140 break;
141 if (fdl == NULL)
142 return (TRUE);
143 return (check_bound(fdl, uaddr));
144 }
145
146 /*
147 * Returns NULL if there was some system error.
148 * Returns "" if the address was not bound, i.e the server crashed.
149 * Returns the merged address otherwise.
150 */
151 char *
mergeaddr(SVCXPRT * xprt,char * netid,char * uaddr,char * saddr)152 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr)
153 {
154 struct fdlist *fdl;
155 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL;
156
157 for (fdl = fdhead; fdl; fdl = fdl->next)
158 if (strcmp(fdl->nconf->nc_netid, netid) == 0)
159 break;
160 if (fdl == NULL)
161 return (NULL);
162 if (check_bound(fdl, uaddr) == FALSE)
163 /* that server died */
164 return (nullstring);
165 /*
166 * If saddr is not NULL, the remote client may have included the
167 * address by which it contacted us. Use that for the "client" uaddr,
168 * otherwise use the info from the SVCXPRT.
169 */
170 if (saddr != NULL) {
171 c_uaddr = saddr;
172 } else {
173 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt));
174 if (c_uaddr == NULL) {
175 syslog(LOG_ERR, "taddr2uaddr failed for %s",
176 fdl->nconf->nc_netid);
177 return (NULL);
178 }
179 allocated_uaddr = c_uaddr;
180 }
181
182 #ifdef ND_DEBUG
183 if (debugging) {
184 if (saddr == NULL) {
185 fprintf(stderr, "mergeaddr: client uaddr = %s\n",
186 c_uaddr);
187 } else {
188 fprintf(stderr, "mergeaddr: contact uaddr = %s\n",
189 c_uaddr);
190 }
191 }
192 #endif
193 s_uaddr = uaddr;
194 /*
195 * This is all we should need for IP 4 and 6
196 */
197 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid);
198 #ifdef ND_DEBUG
199 if (debugging)
200 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n",
201 uaddr, m_uaddr);
202 #endif
203 if (allocated_uaddr != NULL)
204 free(allocated_uaddr);
205 return (m_uaddr);
206 }
207
208 /*
209 * Returns a netconf structure from its internal list. This
210 * structure should not be freed.
211 */
212 struct netconfig *
rpcbind_get_conf(char * netid)213 rpcbind_get_conf(char *netid)
214 {
215 struct fdlist *fdl;
216
217 for (fdl = fdhead; fdl; fdl = fdl->next)
218 if (strcmp(fdl->nconf->nc_netid, netid) == 0)
219 break;
220 if (fdl == NULL)
221 return (NULL);
222 return (fdl->nconf);
223 }
224