getprotoname.c revision 158115 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)getprotoname.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/net/getprotoname.c 158115 2006-04-28 12:03:38Z ume $");
39
40#include <netdb.h>
41#include <nsswitch.h>
42#include <string.h>
43#include "netdb_private.h"
44#ifdef NS_CACHING
45#include "nscache.h"
46#endif
47#include "nss_tls.h"
48
49static const ns_src defaultsrc[] = {
50	{ NSSRC_FILES, NS_SUCCESS },
51	{ NULL, 0 }
52};
53
54#ifdef NS_CACHING
55extern int __proto_id_func(char *, size_t *, va_list, void *);
56extern int __proto_marshal_func(char *, size_t *, void *, va_list, void *);
57extern int __proto_unmarshal_func(char *, size_t, void *, va_list, void *);
58#endif
59
60static int
61files_getprotobyname(void *retval, void *mdata, va_list ap)
62{
63	struct protoent pe;
64	struct protoent_data *ped;
65	char **cp;
66	int error;
67
68	char *name;
69	struct protoent	*pptr;
70	char *buffer;
71	size_t buflen;
72	int *errnop;
73
74	name = va_arg(ap, char *);
75	pptr = va_arg(ap, struct protoent *);
76	buffer = va_arg(ap, char *);
77	buflen = va_arg(ap, size_t);
78	errnop = va_arg(ap, int *);
79
80
81	if ((ped = __protoent_data_init()) == NULL) {
82		*errnop = -1;
83		return (NS_NOTFOUND);
84	}
85
86	__setprotoent_p(ped->stayopen, ped);
87	while ((error = __getprotoent_p(&pe, ped)) == 0) {
88		if (strcmp(pe.p_name, name) == 0)
89			break;
90		for (cp = pe.p_aliases; *cp != 0; cp++)
91			if (strcmp(*cp, name) == 0)
92				goto found;
93	}
94found:
95	if (!ped->stayopen)
96		__endprotoent_p(ped);
97	if (error != 0) {
98		*errnop = -1;
99		return (NS_NOTFOUND);
100	}
101	if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
102		*errnop = -1;
103		return (NS_NOTFOUND);
104	}
105
106	*((struct protoent **)retval) = pptr;
107	return (NS_SUCCESS);
108}
109
110
111int
112getprotobyname_r(const char *name, struct protoent *pptr, char *buffer,
113    size_t buflen, struct protoent **result)
114{
115#ifdef NS_CACHING
116	static const nss_cache_info cache_info =
117		NS_COMMON_CACHE_INFO_INITIALIZER(
118		protocols, (void *)nss_lt_name,
119		__proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
120#endif
121	static const ns_dtab dtab[] = {
122		{ NSSRC_FILES, files_getprotobyname, NULL },
123#ifdef NS_CACHING
124		NS_CACHE_CB(&cache_info)
125#endif
126		{ NULL, NULL, NULL }
127	};
128	int	rv, ret_errno;
129
130	ret_errno = 0;
131	*result = NULL;
132	rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobyname_r",
133	    defaultsrc, name, pptr, buffer, buflen, &ret_errno);
134
135	if (rv == NS_SUCCESS)
136		return (0);
137	else
138		return (ret_errno);
139}
140
141struct protoent *
142getprotobyname(const char *name)
143{
144	struct protodata *pd;
145	struct protoent *rval;
146
147	if ((pd = __protodata_init()) == NULL)
148		return (NULL);
149	if (getprotobyname_r(name, &pd->proto, pd->data, sizeof(pd->data),
150	    &rval) != 0)
151		return (NULL);
152	return (rval);
153}
154