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
39 static 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
65 struct fdlist {
66 int fd;
67 struct netconfig *nconf;
68 struct fdlist *next;
69 int check_binding;
70 };
71
72 static struct fdlist *fdhead; /* Link list of the check fd's */
73 static struct fdlist *fdtail;
74 static const char emptystring[] = "";
75
76 static 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 */
83 static bool_t
check_bound(struct fdlist * fdl,const char * uaddr)84 check_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
111 int
add_bndlist(struct netconfig * nconf,struct netbuf * baddr)112 add_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
141 bool_t
is_bound(const char * netid,const char * uaddr)142 is_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 */
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 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 */
220 struct netconfig *
rpcbind_get_conf(const char * netid)221 rpcbind_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