1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * 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 are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /*
32 * netname utility routines
33 * convert from unix names to network names and vice-versa
34 * This module is operating system dependent!
35 * What we define here will work with any unix system that has adopted
36 * the sun NIS domain architecture.
37 */
38
39 #include "namespace.h"
40 #include <sys/param.h>
41 #include <rpc/rpc.h>
42 #include <rpc/rpc_com.h>
43 #ifdef YP
44 #include <rpcsvc/yp_prot.h>
45 #include <rpcsvc/ypclnt.h>
46 #endif
47 #include <ctype.h>
48 #include <limits.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include "un-namespace.h"
54
55 #ifndef MAXHOSTNAMELEN
56 #define MAXHOSTNAMELEN 256
57 #endif
58
59 #define TYPE_BIT(type) (sizeof (type) * CHAR_BIT)
60
61 #define TYPE_SIGNED(type) (((type) -1) < 0)
62
63 /*
64 ** 302 / 1000 is log10(2.0) rounded up.
65 ** Subtract one for the sign bit if the type is signed;
66 ** add one for integer division truncation;
67 ** add one more for a minus sign if the type is signed.
68 */
69 #define INT_STRLEN_MAXIMUM(type) \
70 ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type))
71
72 static char *OPSYS = "unix";
73
74 /*
75 * Figure out my fully qualified network name
76 */
77 int
getnetname(char name[MAXNETNAMELEN+1])78 getnetname(char name[MAXNETNAMELEN+1])
79 {
80 uid_t uid;
81
82 uid = geteuid();
83 if (uid == 0) {
84 return (host2netname(name, (char *) NULL, (char *) NULL));
85 } else {
86 return (user2netname(name, uid, (char *) NULL));
87 }
88 }
89
90
91 /*
92 * Convert unix cred to network-name
93 */
94 int
user2netname(char netname[MAXNETNAMELEN+1],const uid_t uid,const char * domain)95 user2netname(char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain)
96 {
97 char *dfltdom;
98
99 if (domain == NULL) {
100 if (__rpc_get_default_domain(&dfltdom) != 0) {
101 return (0);
102 }
103 domain = dfltdom;
104 }
105 if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
106 return (0);
107 }
108 (void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain);
109 return (1);
110 }
111
112
113 /*
114 * Convert host to network-name
115 */
116 int
host2netname(char netname[MAXNETNAMELEN+1],const char * host,const char * domain)117 host2netname(char netname[MAXNETNAMELEN + 1], const char *host, const char *domain)
118 {
119 char *dfltdom;
120 char hostname[MAXHOSTNAMELEN+1];
121
122 if (domain == NULL) {
123 if (__rpc_get_default_domain(&dfltdom) != 0) {
124 return (0);
125 }
126 domain = dfltdom;
127 }
128 if (host == NULL) {
129 (void) gethostname(hostname, sizeof(hostname));
130 host = hostname;
131 }
132 if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
133 return (0);
134 }
135 (void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain);
136 return (1);
137 }
138