getproto.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)getproto.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/lib/libc/net/getproto.c 330897 2018-03-14 03:19:51Z eadler $");
37
38#include <errno.h>
39#include <netdb.h>
40#include <nsswitch.h>
41#include "netdb_private.h"
42#ifdef NS_CACHING
43#include "nscache.h"
44#endif
45#include "nss_tls.h"
46
47static const ns_src defaultsrc[] = {
48	{ NSSRC_FILES, NS_SUCCESS },
49	{ NULL, 0 }
50};
51
52static int
53files_getprotobynumber(void *retval, void *mdata, va_list ap)
54{
55	struct protoent pe;
56	struct protoent_data *ped;
57	int error;
58
59	int number;
60	struct protoent	*pptr;
61	char *buffer;
62	size_t buflen;
63	int *errnop;
64
65	number = va_arg(ap, int);
66	pptr = va_arg(ap, struct protoent *);
67	buffer = va_arg(ap, char *);
68	buflen = va_arg(ap, size_t);
69	errnop = va_arg(ap, int *);
70
71	if ((ped = __protoent_data_init()) == NULL) {
72		*errnop = errno;
73		return (NS_NOTFOUND);
74	}
75
76	__setprotoent_p(ped->stayopen, ped);
77	while ((error = __getprotoent_p(&pe, ped)) == 0)
78		if (pe.p_proto == number)
79			break;
80	if (!ped->stayopen)
81		__endprotoent_p(ped);
82	if (error != 0) {
83		*errnop = errno;
84		return (NS_NOTFOUND);
85	}
86	if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
87		*errnop = errno;
88		return (NS_RETURN);
89	}
90
91	*((struct protoent **)retval) = pptr;
92	return (NS_SUCCESS);
93}
94
95int
96getprotobynumber_r(int proto, struct protoent *pptr, char *buffer,
97    size_t buflen, struct protoent **result)
98{
99#ifdef NS_CACHING
100	static const nss_cache_info cache_info =
101    		NS_COMMON_CACHE_INFO_INITIALIZER(
102		protocols, (void *)nss_lt_id,
103		__proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
104#endif
105
106	static const ns_dtab dtab[] = {
107		{ NSSRC_FILES, files_getprotobynumber, NULL },
108#ifdef NS_CACHING
109		NS_CACHE_CB(&cache_info)
110#endif
111		{ NULL, NULL, NULL }
112	};
113	int	rv, ret_errno;
114
115	ret_errno = 0;
116	*result = NULL;
117	rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobynumber_r",
118		defaultsrc, proto, pptr, buffer, buflen, &ret_errno);
119
120	if (rv != NS_SUCCESS) {
121		errno = ret_errno;
122		return (ret_errno);
123	}
124	return (0);
125}
126
127struct protoent *
128getprotobynumber(int proto)
129{
130	struct protodata *pd;
131	struct protoent *rval;
132
133	if ((pd = __protodata_init()) == NULL)
134		return (NULL);
135	if (getprotobynumber_r(proto, &pd->proto, pd->data, sizeof(pd->data),
136	    &rval) != 0)
137		return (NULL);
138	return (rval);
139}
140