getprotoname.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)getprotoname.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/lib/libc/net/getprotoname.c 331722 2018-03-29 02:50:57Z eadler $");
35
36#include <errno.h>
37#include <netdb.h>
38#include <nsswitch.h>
39#include <string.h>
40#include "netdb_private.h"
41#ifdef NS_CACHING
42#include "nscache.h"
43#endif
44#include "nss_tls.h"
45
46static const ns_src defaultsrc[] = {
47	{ NSSRC_FILES, NS_SUCCESS },
48	{ NULL, 0 }
49};
50
51#ifdef NS_CACHING
52extern int __proto_id_func(char *, size_t *, va_list, void *);
53extern int __proto_marshal_func(char *, size_t *, void *, va_list, void *);
54extern int __proto_unmarshal_func(char *, size_t, void *, va_list, void *);
55#endif
56
57static int
58files_getprotobyname(void *retval, void *mdata, va_list ap)
59{
60	struct protoent pe;
61	struct protoent_data *ped;
62	char **cp;
63	int error;
64
65	char *name;
66	struct protoent	*pptr;
67	char *buffer;
68	size_t buflen;
69	int *errnop;
70
71	name = va_arg(ap, char *);
72	pptr = va_arg(ap, struct protoent *);
73	buffer = va_arg(ap, char *);
74	buflen = va_arg(ap, size_t);
75	errnop = va_arg(ap, int *);
76
77
78	if ((ped = __protoent_data_init()) == NULL) {
79		*errnop = errno;
80		return (NS_NOTFOUND);
81	}
82
83	__setprotoent_p(ped->stayopen, ped);
84	while ((error = __getprotoent_p(&pe, ped)) == 0) {
85		if (strcmp(pe.p_name, name) == 0)
86			break;
87		for (cp = pe.p_aliases; *cp != 0; cp++)
88			if (strcmp(*cp, name) == 0)
89				goto found;
90	}
91found:
92	if (!ped->stayopen)
93		__endprotoent_p(ped);
94	if (error != 0) {
95		*errnop = errno;
96		return (NS_NOTFOUND);
97	}
98	if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
99		*errnop = errno;
100		return (NS_RETURN);
101	}
102
103	*((struct protoent **)retval) = pptr;
104	return (NS_SUCCESS);
105}
106
107
108int
109getprotobyname_r(const char *name, struct protoent *pptr, char *buffer,
110    size_t buflen, struct protoent **result)
111{
112#ifdef NS_CACHING
113	static const nss_cache_info cache_info =
114		NS_COMMON_CACHE_INFO_INITIALIZER(
115		protocols, (void *)nss_lt_name,
116		__proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
117#endif
118	static const ns_dtab dtab[] = {
119		{ NSSRC_FILES, files_getprotobyname, NULL },
120#ifdef NS_CACHING
121		NS_CACHE_CB(&cache_info)
122#endif
123		{ NULL, NULL, NULL }
124	};
125	int	rv, ret_errno;
126
127	ret_errno = 0;
128	*result = NULL;
129	rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobyname_r",
130	    defaultsrc, name, pptr, buffer, buflen, &ret_errno);
131
132	if (rv != NS_SUCCESS) {
133		errno = ret_errno;
134		return (ret_errno);
135	}
136	return (0);
137}
138
139struct protoent *
140getprotobyname(const char *name)
141{
142	struct protodata *pd;
143	struct protoent *rval;
144
145	if ((pd = __protodata_init()) == NULL)
146		return (NULL);
147	if (getprotobyname_r(name, &pd->proto, pd->data, sizeof(pd->data),
148	    &rval) != 0)
149		return (NULL);
150	return (rval);
151}
152