xref: /freebsd/lib/libc/net/getproto.c (revision 2be1a816b9ff69588e55be0a84cbe2a31efc0f2f)
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)
31 static char sccsid[] = "@(#)getproto.c	8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 
36 #include <netdb.h>
37 #include <nsswitch.h>
38 #include "netdb_private.h"
39 #ifdef NS_CACHING
40 #include "nscache.h"
41 #endif
42 #include "nss_tls.h"
43 
44 static const ns_src defaultsrc[] = {
45 	{ NSSRC_FILES, NS_SUCCESS },
46 	{ NULL, 0 }
47 };
48 
49 #ifdef NS_CACHING
50 extern int __proto_id_func(char *, size_t *, va_list, void *);
51 extern int __proto_marshal_func(char *, size_t *, void *, va_list, void *);
52 extern int __proto_unmarshal_func(char *, size_t, void *, va_list, void *);
53 #endif
54 
55 static int
56 files_getprotobynumber(void *retval, void *mdata, va_list ap)
57 {
58 	struct protoent pe;
59 	struct protoent_data *ped;
60 	int error;
61 
62 	int number;
63 	struct protoent	*pptr;
64 	char *buffer;
65 	size_t buflen;
66 	int *errnop;
67 
68 	number = va_arg(ap, int);
69 	pptr = va_arg(ap, struct protoent *);
70 	buffer = va_arg(ap, char *);
71 	buflen = va_arg(ap, size_t);
72 	errnop = va_arg(ap, int *);
73 
74 	if ((ped = __protoent_data_init()) == NULL) {
75 		*errnop = -1;
76 		return (NS_NOTFOUND);
77 	}
78 
79 	__setprotoent_p(ped->stayopen, ped);
80 	while ((error = __getprotoent_p(&pe, ped)) == 0)
81 		if (pe.p_proto == number)
82 			break;
83 	if (!ped->stayopen)
84 		__endprotoent_p(ped);
85 	if (error != 0) {
86 		*errnop = -1;
87 		return (NS_NOTFOUND);
88 	}
89 	if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
90 		*errnop = -1;
91 		return (NS_NOTFOUND);
92 	}
93 
94 	*((struct protoent **)retval) = pptr;
95 	return (NS_SUCCESS);
96 }
97 
98 int
99 getprotobynumber_r(int proto, struct protoent *pptr, char *buffer,
100     size_t buflen, struct protoent **result)
101 {
102 #ifdef NS_CACHING
103 	static const nss_cache_info cache_info =
104     		NS_COMMON_CACHE_INFO_INITIALIZER(
105 		protocols, (void *)nss_lt_id,
106 		__proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
107 #endif
108 
109 	static const ns_dtab dtab[] = {
110 		{ NSSRC_FILES, files_getprotobynumber, NULL },
111 #ifdef NS_CACHING
112 		NS_CACHE_CB(&cache_info)
113 #endif
114 		{ NULL, NULL, NULL }
115 	};
116 	int	rv, ret_errno;
117 
118 	ret_errno = 0;
119 	*result = NULL;
120 	rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobynumber_r",
121 		defaultsrc, proto, pptr, buffer, buflen, &ret_errno);
122 
123 	if (rv == NS_SUCCESS)
124 		return (0);
125 	else
126 		return (ret_errno);
127 }
128 
129 struct protoent *
130 getprotobynumber(int proto)
131 {
132 	struct protodata *pd;
133 	struct protoent *rval;
134 
135 	if ((pd = __protodata_init()) == NULL)
136 		return (NULL);
137 	if (getprotobynumber_r(proto, &pd->proto, pd->data, sizeof(pd->data),
138 	    &rval) != 0)
139 		return (NULL);
140 	return (rval);
141 }
142