1 /* $OpenBSD: yp_bind.c,v 1.33 2024/01/22 16:18:06 deraadt Exp $ */
2 /*
3 * Copyright (c) 1992, 1993, 1996 Theo de Raadt <deraadt@theos.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <sys/uio.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <paths.h>
39
40 #include <rpc/rpc.h>
41 #include <rpc/xdr.h>
42 #include <rpcsvc/yp.h>
43 #include <rpcsvc/ypclnt.h>
44 #include "ypinternal.h"
45
46 char _yp_domain[HOST_NAME_MAX+1];
47 int _yplib_timeout = 10;
48
49 extern CLIENT *
50 clntudp_bufcreate_simple(struct sockaddr_in *raddr, u_long program, u_long version,
51 struct timeval wait, int *sockp, u_int sendsz, u_int recvsz);
52
53 int
_yp_dobind(const char * dom,struct dom_binding ** ypdb)54 _yp_dobind(const char *dom, struct dom_binding **ypdb)
55 {
56 struct dom_binding *ypbinding;
57 struct timeval tv;
58 int connected = 1;
59 int s;
60
61 if (dom == NULL || strlen(dom) == 0)
62 return YPERR_BADARGS;
63
64 ypbinding = calloc(1, sizeof (*ypbinding));
65 if (ypbinding == NULL)
66 return YPERR_RESRC;
67
68 again:
69 s = ypconnect(SOCK_DGRAM);
70 if (s == -1) {
71 free(ypbinding);
72 return YPERR_YPBIND; /* YP not running */
73 }
74 ypbinding->dom_socket = s;
75 ypbinding->dom_server_addr.sin_port = -1; /* don't consult portmap */
76
77 tv.tv_sec = _yplib_timeout / 2;
78 tv.tv_usec = 0;
79 ypbinding->dom_client = clntudp_bufcreate_simple(&ypbinding->dom_server_addr,
80 YPPROG, YPVERS, tv, &ypbinding->dom_socket, UDPMSGSIZE, UDPMSGSIZE);
81 if (ypbinding->dom_client == NULL) {
82 close(ypbinding->dom_socket);
83 ypbinding->dom_socket = -1;
84 clnt_pcreateerror("clntudp_create");
85 goto again;
86 }
87 clnt_control(ypbinding->dom_client, CLSET_CONNECTED, &connected);
88 *ypdb = ypbinding;
89 return 0;
90 }
91
92 void
_yp_unbind(struct dom_binding * ypb)93 _yp_unbind(struct dom_binding *ypb)
94 {
95 close(ypb->dom_socket);
96 if (ypb->dom_client)
97 clnt_destroy(ypb->dom_client);
98 free(ypb);
99 }
100
101 /*
102 * Check if YP is running. But do not leave it active, because we
103 * may not return from libc with a fd active.
104 */
105 int
yp_bind(const char * dom)106 yp_bind(const char *dom)
107 {
108 struct dom_binding *ysd;
109 int r;
110
111 r = _yp_dobind(dom, &ysd);
112 if (r == 0)
113 _yp_unbind(ysd);
114 return r;
115 }
116 DEF_WEAK(yp_bind);
117
118 void
yp_unbind(const char * dom)119 yp_unbind(const char *dom)
120 {
121 /* do nothing */
122 }
123