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 * 3. 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)
33 static 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/12/lib/libc/net/getproto.c 326025 2017-11-20 19:49:47Z pfg $");
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
47 static const ns_src defaultsrc[] = {
48 { NSSRC_FILES, NS_SUCCESS },
49 { NULL, 0 }
50 };
51
52 static int
files_getprotobynumber(void * retval,void * mdata,va_list ap)53 files_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
95 int
getprotobynumber_r(int proto,struct protoent * pptr,char * buffer,size_t buflen,struct protoent ** result)96 getprotobynumber_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
127 struct protoent *
getprotobynumber(int proto)128 getprotobynumber(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