summaryrefslogtreecommitdiffstats
path: root/usr.sbin/rpcbind/check_bound.c
blob: e5f7081b6f1728ea162068449e4105b89a614355 (plain)
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
/*	$NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $	*/
/*	$FreeBSD$ */

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */
/*
 * 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 univeral merged address
 *
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <rpc/rpc.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 __P((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)
{
	struct fdlist *fdl;
	struct netconfig *newnconf;

	newnconf = getnetconfigent(nconf->nc_netid);
	if (newnconf == NULL)
		return (-1);
	fdl = (struct fdlist *)malloc((u_int)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;
	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);
	/*
	 * 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.
	 */
	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(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);
}
OpenPOWER on IntegriCloud