1 /* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */
2 /* $FreeBSD$ */
3
4 /*
5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
6 * unrestricted use provided that this legend is included on all tape
7 * media and as a part of the software program in whole or part. Users
8 * may copy or modify Sun RPC without charge, but are not authorized
9 * to license or distribute it to anyone else except as part of a product or
10 * program developed by the user.
11 *
12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 *
16 * Sun RPC is provided with no support and without any obligation on the
17 * part of Sun Microsystems, Inc. to assist in its use, correction,
18 * modification or enhancement.
19 *
20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
22 * OR ANY PART THEREOF.
23 *
24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
25 * or profits or other special, indirect and consequential damages, even if
26 * Sun has been advised of the possibility of such damages.
27 *
28 * Sun Microsystems, Inc.
29 * 2550 Garcia Avenue
30 * Mountain View, California 94043
31 */
32 /*
33 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
34 */
35
36 /* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro";
41 #endif
42 #endif
43
44 /*
45 * check_bound.c
46 * Checks to see whether the program is still bound to the
47 * claimed address and returns the universal merged address
48 *
49 */
50
51 #include <sys/types.h>
52 #include <sys/socket.h>
53 #include <rpc/rpc.h>
54 #include <stdio.h>
55 #include <netconfig.h>
56 #include <syslog.h>
57 #include <string.h>
58 #include <unistd.h>
59 #include <stdlib.h>
60
61 #include "rpcbind.h"
62
63 struct fdlist {
64 int fd;
65 struct netconfig *nconf;
66 struct fdlist *next;
67 int check_binding;
68 };
69
70 static struct fdlist *fdhead; /* Link list of the check fd's */
71 static struct fdlist *fdtail;
72 static char *nullstring = "";
73
74 static bool_t check_bound(struct fdlist *, char *uaddr);
75
76 /*
77 * Returns 1 if the given address is bound for the given addr & transport
78 * For all error cases, we assume that the address is bound
79 * Returns 0 for success.
80 */
81 static bool_t
check_bound(struct fdlist * fdl,char * uaddr)82 check_bound(struct fdlist *fdl, char *uaddr)
83 {
84 int fd;
85 struct netbuf *na;
86 int ans;
87
88 if (fdl->check_binding == FALSE)
89 return (TRUE);
90
91 na = uaddr2taddr(fdl->nconf, uaddr);
92 if (!na)
93 return (TRUE); /* punt, should never happen */
94
95 fd = __rpc_nconf2fd(fdl->nconf);
96 if (fd < 0) {
97 free(na->buf);
98 free(na);
99 return (TRUE);
100 }
101
102 ans = bind(fd, (struct sockaddr *)na->buf, na->len);
103
104 close(fd);
105 free(na->buf);
106 free(na);
107
108 return (ans == 0 ? FALSE : TRUE);
109 }
110
111 int
add_bndlist(struct netconfig * nconf,struct netbuf * baddr __unused)112 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused)
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 = malloc(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
141 bool_t
is_bound(char * netid,char * uaddr)142 is_bound(char *netid, 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 */
159 char *
mergeaddr(SVCXPRT * xprt,char * netid,char * uaddr,char * saddr)160 mergeaddr(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 (nullstring);
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 ND_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 ND_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 */
220 struct netconfig *
rpcbind_get_conf(char * netid)221 rpcbind_get_conf(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