1 /* $OpenBSD: yp_first.c,v 1.12 2022/08/02 16:59:29 deraadt Exp $ */
2 /*
3 * Copyright (c) 1992, 1993 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 <limits.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <rpc/rpc.h>
33 #include <rpc/xdr.h>
34 #include <rpcsvc/yp.h>
35 #include <rpcsvc/ypclnt.h>
36 #include "ypinternal.h"
37
38 int
yp_first(const char * indomain,const char * inmap,char ** outkey,int * outkeylen,char ** outval,int * outvallen)39 yp_first(const char *indomain, const char *inmap, char **outkey, int *outkeylen,
40 char **outval, int *outvallen)
41 {
42 struct ypresp_key_val yprkv;
43 struct ypreq_nokey yprnk;
44 struct dom_binding *ysd = NULL;
45 struct timeval tv;
46 int tries = 0, r;
47
48 if (indomain == NULL || *indomain == '\0' ||
49 strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
50 *inmap == '\0' || strlen(inmap) > YPMAXMAP)
51 return YPERR_BADARGS;
52
53 *outkey = *outval = NULL;
54 *outkeylen = *outvallen = 0;
55
56 again:
57 if (_yp_dobind(indomain, &ysd) != 0)
58 return YPERR_DOMAIN;
59
60 tv.tv_sec = _yplib_timeout;
61 tv.tv_usec = 0;
62
63 yprnk.domain = (char *)indomain;
64 yprnk.map = (char *)inmap;
65 (void)memset(&yprkv, 0, sizeof yprkv);
66
67 r = clnt_call(ysd->dom_client, YPPROC_FIRST,
68 xdr_ypreq_nokey, &yprnk, xdr_ypresp_key_val, &yprkv, tv);
69 if (r != RPC_SUCCESS) {
70 if (tries++)
71 clnt_perror(ysd->dom_client, "yp_first: clnt_call");
72 _yp_unbind(ysd);
73 goto again;
74 }
75 if (!(r = ypprot_err(yprkv.stat))) {
76 *outkeylen = yprkv.key.keydat_len;
77 *outvallen = yprkv.val.valdat_len;
78 if ((*outkey = malloc(*outkeylen + 1)) == NULL ||
79 (*outval = malloc(*outvallen + 1)) == NULL) {
80 free(*outkey);
81 r = YPERR_RESRC;
82 } else {
83 (void)memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
84 (*outkey)[*outkeylen] = '\0';
85 (void)memcpy(*outval, yprkv.val.valdat_val, *outvallen);
86 (*outval)[*outvallen] = '\0';
87 }
88 }
89 xdr_free(xdr_ypresp_key_val, (char *) &yprkv);
90 _yp_unbind(ysd);
91 return r;
92 }
93 DEF_WEAK(yp_first);
94