1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */
/* $FreeBSD$ */
/*-
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
*/
/* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */
#if 0
#ifndef lint
static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro";
#endif
#endif
/*
* check_bound.c
* Checks to see whether the program is still bound to the
* claimed address and returns the universal merged address
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <rpc/rpc.h>
#include <rpc/svc_dg.h>
#include <stdio.h>
#include <netconfig.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "rpcbind.h"
struct fdlist {
int fd;
struct netconfig *nconf;
struct fdlist *next;
int check_binding;
};
static struct fdlist *fdhead; /* Link list of the check fd's */
static struct fdlist *fdtail;
static char *nullstring = "";
static bool_t check_bound(struct fdlist *, char *uaddr);
/*
* Returns 1 if the given address is bound for the given addr & transport
* For all error cases, we assume that the address is bound
* Returns 0 for success.
*/
static bool_t
check_bound(struct fdlist *fdl, char *uaddr)
{
int fd;
struct netbuf *na;
int ans;
if (fdl->check_binding == FALSE)
return (TRUE);
na = uaddr2taddr(fdl->nconf, uaddr);
if (!na)
return (TRUE); /* punt, should never happen */
fd = __rpc_nconf2fd(fdl->nconf);
if (fd < 0) {
free(na->buf);
free(na);
return (TRUE);
}
ans = bind(fd, (struct sockaddr *)na->buf, na->len);
close(fd);
free(na->buf);
free(na);
return (ans == 0 ? FALSE : TRUE);
}
int
add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused)
{
struct fdlist *fdl;
struct netconfig *newnconf;
newnconf = getnetconfigent(nconf->nc_netid);
if (newnconf == NULL)
return (-1);
fdl = malloc(sizeof (struct fdlist));
if (fdl == NULL) {
freenetconfigent(newnconf);
syslog(LOG_ERR, "no memory!");
return (-1);
}
fdl->nconf = newnconf;
fdl->next = NULL;
if (fdhead == NULL) {
fdhead = fdl;
fdtail = fdl;
} else {
fdtail->next = fdl;
fdtail = fdl;
}
/* XXX no bound checking for now */
fdl->check_binding = FALSE;
return 0;
}
bool_t
is_bound(char *netid, char *uaddr)
{
struct fdlist *fdl;
for (fdl = fdhead; fdl; fdl = fdl->next)
if (strcmp(fdl->nconf->nc_netid, netid) == 0)
break;
if (fdl == NULL)
return (TRUE);
return (check_bound(fdl, uaddr));
}
/*
* Returns NULL if there was some system error.
* Returns "" if the address was not bound, i.e the server crashed.
* Returns the merged address otherwise.
*/
char *
mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr)
{
struct fdlist *fdl;
struct svc_dg_data *dg_data;
char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL;
for (fdl = fdhead; fdl; fdl = fdl->next)
if (strcmp(fdl->nconf->nc_netid, netid) == 0)
break;
if (fdl == NULL)
return (NULL);
if (check_bound(fdl, uaddr) == FALSE)
/* that server died */
return (nullstring);
/*
* Try to determine the local address on which the client contacted us,
* so we can send a reply from the same address. If it's unknown, then
* try to determine which address the client used, and pick a nearby
* local address.
*
* If saddr is not NULL, the remote client may have included the
* address by which it contacted us. Use that for the "client" uaddr,
* otherwise use the info from the SVCXPRT.
*/
dg_data = (struct svc_dg_data*)xprt->xp_p2;
if (dg_data != NULL && dg_data->su_srcaddr.buf != NULL) {
c_uaddr = taddr2uaddr(fdl->nconf, &dg_data->su_srcaddr);
}
else if (saddr != NULL) {
c_uaddr = saddr;
} else {
c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt));
if (c_uaddr == NULL) {
syslog(LOG_ERR, "taddr2uaddr failed for %s",
fdl->nconf->nc_netid);
return (NULL);
}
allocated_uaddr = c_uaddr;
}
#ifdef ND_DEBUG
if (debugging) {
if (saddr == NULL) {
fprintf(stderr, "mergeaddr: client uaddr = %s\n",
c_uaddr);
} else {
fprintf(stderr, "mergeaddr: contact uaddr = %s\n",
c_uaddr);
}
}
#endif
s_uaddr = uaddr;
/*
* This is all we should need for IP 4 and 6
*/
m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid);
#ifdef ND_DEBUG
if (debugging)
fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n",
uaddr, m_uaddr);
#endif
if (allocated_uaddr != NULL)
free(allocated_uaddr);
return (m_uaddr);
}
/*
* Returns a netconf structure from its internal list. This
* structure should not be freed.
*/
struct netconfig *
rpcbind_get_conf(const char *netid)
{
struct fdlist *fdl;
for (fdl = fdhead; fdl; fdl = fdl->next)
if (strcmp(fdl->nconf->nc_netid, netid) == 0)
break;
if (fdl == NULL)
return (NULL);
return (fdl->nconf);
}
|
