xref: /illumos-gate/usr/src/lib/libnsl/nss/getrpcent_r.c (revision 86d949f9497332fe19be6b5d711d265eb957439f)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*
28  * Rentrant (MT-safe) getrpcYY interfaces.
29  */
30 
31 #include "mt.h"
32 #include <ctype.h>
33 #include <nss_dbdefs.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <rpc/rpcent.h>
37 
38 extern int str2rpcent(const char *, int, void *, char *, int);
39 
40 static int rpc_stayopen;	/* Unsynchronized, but it affects only	*/
41 				/*   efficiency, not correctness	*/
42 static DEFINE_NSS_DB_ROOT(db_root);
43 static DEFINE_NSS_GETENT(context);
44 
45 void
46 _nss_initf_rpc(nss_db_params_t *p)
47 {
48 	p->name	= NSS_DBNAM_RPC;
49 	p->default_config = NSS_DEFCONF_RPC;
50 }
51 
52 struct rpcent *
53 getrpcbyname_r(const char *name, struct rpcent *result, char *buffer,
54 								int buflen)
55 {
56 	nss_XbyY_args_t arg;
57 	nss_status_t	res;
58 
59 	if (name == (const char *)NULL) {
60 		errno = ERANGE;
61 		return (NULL);
62 	}
63 	NSS_XbyY_INIT(&arg, result, buffer, buflen, str2rpcent);
64 	arg.key.name	= name;
65 	arg.stayopen	= rpc_stayopen;
66 	res = nss_search(&db_root, _nss_initf_rpc,
67 		NSS_DBOP_RPC_BYNAME, &arg);
68 	arg.status = res;
69 	return ((struct rpcent *)NSS_XbyY_FINI(&arg));
70 }
71 
72 struct rpcent *
73 getrpcbynumber_r(const int number, struct rpcent *result, char *buffer,
74 								int buflen)
75 {
76 	nss_XbyY_args_t arg;
77 	nss_status_t	res;
78 
79 	NSS_XbyY_INIT(&arg, result, buffer, buflen, str2rpcent);
80 	arg.key.number	= number;
81 	arg.stayopen	= rpc_stayopen;
82 	res = nss_search(&db_root, _nss_initf_rpc,
83 		NSS_DBOP_RPC_BYNUMBER, &arg);
84 	arg.status = res;
85 	return ((struct rpcent *)NSS_XbyY_FINI(&arg));
86 }
87 
88 void
89 setrpcent(const int stay)
90 {
91 	rpc_stayopen |= stay;
92 	nss_setent(&db_root, _nss_initf_rpc, &context);
93 }
94 
95 void
96 endrpcent(void)
97 {
98 	rpc_stayopen = 0;
99 	nss_endent(&db_root, _nss_initf_rpc, &context);
100 	nss_delete(&db_root);
101 }
102 
103 struct rpcent *
104 getrpcent_r(struct rpcent *result, char *buffer, int buflen)
105 {
106 	nss_XbyY_args_t arg;
107 	nss_status_t	res;
108 
109 	NSS_XbyY_INIT(&arg, result, buffer, buflen, str2rpcent);
110 	/* No key, no stayopen */
111 	res = nss_getent(&db_root, _nss_initf_rpc, &context, &arg);
112 	arg.status = res;
113 	return ((struct rpcent *)NSS_XbyY_FINI(&arg));
114 }
115 
116 int
117 str2rpcent(const char *instr, int lenstr, void *ent, char *buffer, int buflen)
118 {
119 	struct rpcent	*rpc	= (struct rpcent *)ent;
120 	const char	*p, *numstart, *limit, *namestart;
121 	ssize_t		numlen, namelen = 0;
122 	char		numbuf[12];
123 	char		*numend;
124 
125 	if ((instr >= buffer && (buffer + buflen) > instr) ||
126 			(buffer >= instr && (instr + lenstr) > buffer))
127 		return (NSS_STR_PARSE_PARSE);
128 
129 	p = instr;
130 	limit = p + lenstr;
131 
132 	while (p < limit && isspace(*p)) {
133 		p++;
134 	}
135 	namestart = p;
136 	while (p < limit && !isspace(*p)) {
137 		p++;		/* Skip over the canonical name */
138 	}
139 	namelen = p - namestart;
140 
141 	if (buflen <= namelen)		/* not enough buffer */
142 		return (NSS_STR_PARSE_ERANGE);
143 	(void) memcpy(buffer, namestart, namelen);
144 	buffer[namelen] = '\0';
145 	rpc->r_name = buffer;
146 
147 	while (p < limit && isspace(*p)) {
148 		p++;
149 	}
150 	if (p >= limit)			/* Syntax error -- no RPC number */
151 		return (NSS_STR_PARSE_PARSE);
152 	numstart = p;
153 	do {
154 		p++;		/* Find the end of the RPC number */
155 	} while (p < limit && !isspace(*p));
156 	numlen = p - numstart;
157 	if (numlen >= sizeof (numbuf)) {
158 		/* Syntax error -- supposed number is too long */
159 		return (NSS_STR_PARSE_PARSE);
160 	}
161 	(void) memcpy(numbuf, numstart, numlen);
162 	numbuf[numlen] = '\0';
163 	rpc->r_number = (int)strtol(numbuf, &numend, 10);
164 	if (*numend != '\0')
165 		return (NSS_STR_PARSE_PARSE);
166 
167 	while (p < limit && isspace(*p)) {
168 		p++;
169 	}
170 	/*
171 	 * Although nss_files_XY_all calls us with # stripped,
172 	 * we should be able to deal with it here in order to
173 	 * be more useful.
174 	 */
175 	if (p >= limit || *p == '#') { /* no aliases, no problem */
176 		char **ptr;
177 
178 		ptr = (char **)ROUND_UP(buffer + namelen + 1,
179 							sizeof (char *));
180 		if ((char *)ptr >= buffer + buflen) {
181 			rpc->r_aliases = 0; /* hope they don't try to peek in */
182 			return (NSS_STR_PARSE_ERANGE);
183 		}
184 		*ptr = 0;
185 		rpc->r_aliases = ptr;
186 		return (NSS_STR_PARSE_SUCCESS);
187 	}
188 	rpc->r_aliases = _nss_netdb_aliases(p, (int)(lenstr - (p - instr)),
189 			buffer + namelen + 1, (int)(buflen - namelen - 1));
190 	return (NSS_STR_PARSE_SUCCESS);
191 }
192