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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
|
/* $OpenBSD: yp_bind.c,v 1.2 1996/05/22 02:08:35 deraadt Exp $ */
/* $NetBSD: yplib.c,v 1.17 1996/02/04 23:26:26 jtc Exp $ */
/*
* Copyright (c) 1992, 1993 Theo de Raadt <deraadt@theos.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Theo de Raadt.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: yplib.c,v 1.17 1996/02/04 23:26:26 jtc Exp $";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "ypinternal.h"
struct dom_binding *_ypbindlist;
char _yp_domain[MAXHOSTNAMELEN];
int _yplib_timeout = 10;
int
_yp_dobind(dom, ypdb)
const char *dom;
struct dom_binding **ypdb;
{
static int pid = -1;
char path[MAXPATHLEN];
struct dom_binding *ysd, *ysd2;
struct ypbind_resp ypbr;
struct timeval tv;
struct sockaddr_in clnt_sin;
int clnt_sock, fd, gpid;
CLIENT *client;
int new = 0, r;
int count = 0;
/*
* test if YP is running or not
*/
if ((fd = open(YPBINDLOCK, O_RDONLY)) == -1)
return YPERR_YPBIND;
if (!(flock(fd, LOCK_EX | LOCK_NB) == -1 && errno == EWOULDBLOCK)) {
(void)close(fd);
return YPERR_YPBIND;
}
(void)close(fd);
gpid = getpid();
if (!(pid == -1 || pid == gpid)) {
ysd = _ypbindlist;
while (ysd) {
if (ysd->dom_client)
clnt_destroy(ysd->dom_client);
ysd2 = ysd->dom_pnext;
free(ysd);
ysd = ysd2;
}
_ypbindlist = NULL;
}
pid = gpid;
if (ypdb != NULL)
*ypdb = NULL;
if (dom == NULL || strlen(dom) == 0)
return YPERR_BADARGS;
for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
if (strcmp(dom, ysd->dom_domain) == 0)
break;
if (ysd == NULL) {
if ((ysd = malloc(sizeof *ysd)) == NULL)
return YPERR_YPERR;
(void)memset(ysd, 0, sizeof *ysd);
ysd->dom_socket = -1;
ysd->dom_vers = 0;
new = 1;
}
again:
if (ysd->dom_vers == 0) {
(void) snprintf(path, sizeof(path), "%s/%s.%d",
BINDINGDIR, dom, 2);
if ((fd = open(path, O_RDONLY)) == -1) {
/*
* no binding file, YP is dead, or not yet fully
* alive.
*/
goto trynet;
}
if (flock(fd, LOCK_EX | LOCK_NB) == -1 &&
errno == EWOULDBLOCK) {
struct iovec iov[2];
struct ypbind_resp ybr;
u_short ypb_port;
struct ypbind_binding *bn;
iov[0].iov_base = (caddr_t) & ypb_port;
iov[0].iov_len = sizeof ypb_port;
iov[1].iov_base = (caddr_t) & ybr;
iov[1].iov_len = sizeof ybr;
r = readv(fd, iov, 2);
if (r != iov[0].iov_len + iov[1].iov_len) {
(void)close(fd);
ysd->dom_vers = -1;
goto again;
}
(void)memset(&ysd->dom_server_addr, 0,
sizeof ysd->dom_server_addr);
ysd->dom_server_addr.sin_len =
sizeof(struct sockaddr_in);
ysd->dom_server_addr.sin_family = AF_INET;
bn = &ybr.ypbind_resp_u.ypbind_bindinfo;
memcpy(&ysd->dom_server_addr.sin_port,
&bn->ypbind_binding_port,
sizeof(ysd->dom_server_addr.sin_port));
memcpy(&ysd->dom_server_addr.sin_addr,
&bn->ypbind_binding_addr,
sizeof(ysd->dom_server_addr.sin_addr));
ysd->dom_server_port = ysd->dom_server_addr.sin_port;
(void)close(fd);
goto gotit;
} else {
/* no lock on binding file, YP is dead. */
(void)close(fd);
if (new)
free(ysd);
return YPERR_YPBIND;
}
}
trynet:
if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
struct ypbind_binding *bn;
(void)memset(&clnt_sin, 0, sizeof clnt_sin);
clnt_sin.sin_len = sizeof(struct sockaddr_in);
clnt_sin.sin_family = AF_INET;
clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
clnt_sock = RPC_ANYSOCK;
client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS,
&clnt_sock, 0, 0);
if (client == NULL) {
clnt_pcreateerror("clnttcp_create");
if (new)
free(ysd);
return YPERR_YPBIND;
}
tv.tv_sec = _yplib_timeout;
tv.tv_usec = 0;
r = clnt_call(client, YPBINDPROC_DOMAIN, xdr_domainname,
&dom, xdr_ypbind_resp, &ypbr, tv);
if (r != RPC_SUCCESS) {
if (new == 0 || count)
fprintf(stderr,
"YP server for domain %s not responding, still trying\n",
dom);
count++;
clnt_destroy(client);
ysd->dom_vers = -1;
goto again;
}
clnt_destroy(client);
(void)memset(&ysd->dom_server_addr, 0,
sizeof ysd->dom_server_addr);
ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
ysd->dom_server_addr.sin_family = AF_INET;
bn = &ypbr.ypbind_resp_u.ypbind_bindinfo;
memcpy(&ysd->dom_server_addr.sin_port,
&bn->ypbind_binding_port,
sizeof(ysd->dom_server_addr.sin_port));
memcpy(&ysd->dom_server_addr.sin_addr.s_addr,
&bn->ypbind_binding_addr,
sizeof(ysd->dom_server_addr.sin_addr.s_addr));
ysd->dom_server_port = ysd->dom_server_addr.sin_port;
gotit:
ysd->dom_vers = YPVERS;
(void)strcpy(ysd->dom_domain, dom);
}
tv.tv_sec = _yplib_timeout / 2;
tv.tv_usec = 0;
if (ysd->dom_client)
clnt_destroy(ysd->dom_client);
ysd->dom_socket = RPC_ANYSOCK;
ysd->dom_client = clntudp_create(&ysd->dom_server_addr,
YPPROG, YPVERS, tv, &ysd->dom_socket);
if (ysd->dom_client == NULL) {
clnt_pcreateerror("clntudp_create");
ysd->dom_vers = -1;
goto again;
}
if (fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
perror("fcntl: F_SETFD");
if (new) {
ysd->dom_pnext = _ypbindlist;
_ypbindlist = ysd;
}
if (ypdb != NULL)
*ypdb = ysd;
return 0;
}
void
_yp_unbind(ypb)
struct dom_binding *ypb;
{
clnt_destroy(ypb->dom_client);
ypb->dom_client = NULL;
ypb->dom_socket = -1;
}
int
yp_bind(dom)
const char *dom;
{
return _yp_dobind(dom, NULL);
}
void
yp_unbind(dom)
const char *dom;
{
struct dom_binding *ypb, *ypbp;
ypbp = NULL;
for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
if (strcmp(dom, ypb->dom_domain) == 0) {
clnt_destroy(ypb->dom_client);
if (ypbp)
ypbp->dom_pnext = ypb->dom_pnext;
else
_ypbindlist = ypb->dom_pnext;
free(ypb);
return;
}
ypbp = ypb;
}
return;
}
|
