1/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <stdio.h>
20#include <unistd.h>
21#include <string.h>
22#include <rpc/rpc.h>
23#include <shlib-compat.h>
24
25#include "nsswitch.h"
26
27#define OPSYS_LEN 4
28#define MAXIPRINT (11) /* max length of printed integer */
29static const char OPSYS[] = "unix";
30
31int
32user2netname (char netname[MAXNETNAMELEN + 1], const uid_t uid,
33 const char *domain)
34{
35 char dfltdom[MAXNETNAMELEN + 1];
36 size_t i;
37
38 if (domain == NULL)
39 {
40 if (getdomainname (dfltdom, sizeof (dfltdom)) < 0)
41 return 0;
42 }
43 else
44 {
45 strncpy (dfltdom, domain, MAXNETNAMELEN);
46 dfltdom[MAXNETNAMELEN] = '\0';
47 }
48
49 if ((strlen (dfltdom) + OPSYS_LEN + 3 + MAXIPRINT) > (size_t) MAXNETNAMELEN)
50 return 0;
51
52 sprintf (netname, "%s.%d@%s", OPSYS, uid, dfltdom);
53 i = strlen (netname);
54 if (netname[i - 1] == '.')
55 netname[i - 1] = '\0';
56 return 1;
57}
58libc_hidden_nolink_sunrpc (user2netname, GLIBC_2_1)
59
60int
61host2netname (char netname[MAXNETNAMELEN + 1], const char *host,
62 const char *domain)
63{
64 char *p;
65 char hostname[MAXHOSTNAMELEN + 1];
66 char domainname[MAXHOSTNAMELEN + 1];
67 char *dot_in_host;
68 size_t i;
69
70 netname[0] = '\0'; /* make null first (no need for memset) */
71
72 if (host == NULL)
73 __gethostname (hostname, MAXHOSTNAMELEN);
74 else
75 {
76 strncpy (hostname, host, MAXHOSTNAMELEN);
77 hostname[MAXHOSTNAMELEN] = '\0';
78 }
79
80 dot_in_host = strchr (hostname, '.');
81 if (domain == NULL)
82 {
83 p = dot_in_host;
84 if (p)
85 {
86 ++p;
87 strncpy (domainname, p, MAXHOSTNAMELEN);
88 domainname[MAXHOSTNAMELEN] = '\0';
89 }
90 else
91 {
92 domainname[0] = 0;
93 getdomainname (domainname, MAXHOSTNAMELEN);
94 }
95 }
96 else
97 {
98 strncpy (domainname, domain, MAXHOSTNAMELEN);
99 domainname[MAXHOSTNAMELEN] = '\0';
100 }
101
102 i = strlen (domainname);
103 if (i == 0)
104 /* No domainname */
105 return 0;
106 if (domainname[i - 1] == '.')
107 domainname[i - 1] = 0;
108
109 if (dot_in_host) /* strip off rest of name */
110 *dot_in_host = '\0';
111
112 if ((strlen (domainname) + strlen (hostname) + OPSYS_LEN + 3)
113 > MAXNETNAMELEN)
114 return 0;
115
116 sprintf (netname, "%s.%s@%s", OPSYS, hostname, domainname);
117 return 1;
118}
119#ifdef EXPORT_RPC_SYMBOLS
120libc_hidden_def (host2netname)
121#else
122libc_hidden_nolink_sunrpc (host2netname, GLIBC_2_1)
123#endif
124
125int
126getnetname (char name[MAXNETNAMELEN + 1])
127{
128 uid_t uid;
129 int dummy;
130
131 uid = __geteuid ();
132 if (uid == 0)
133 dummy = host2netname (name, NULL, NULL);
134 else
135 dummy = user2netname (name, uid, NULL);
136 return (dummy);
137}
138libc_hidden_nolink_sunrpc (getnetname, GLIBC_2_1)
139
140/* Type of the lookup function for netname2user. */
141typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1],
142 uid_t *, gid_t *, int *, gid_t *);
143
144int
145netname2user (const char *netname, uid_t * uidp, gid_t * gidp,
146 int *gidlenp, gid_t * gidlist)
147{
148 nss_action_list nip;
149 union
150 {
151 netname2user_function f;
152 void *ptr;
153 } fct;
154 enum nss_status status = NSS_STATUS_UNAVAIL;
155 int no_more;
156
157 no_more = __nss_publickey_lookup2 (&nip, "netname2user", NULL, &fct.ptr);
158
159 while (!no_more)
160 {
161 status = (*fct.f) (netname, uidp, gidp, gidlenp, gidlist);
162
163 no_more = __nss_next2 (&nip, "netname2user", NULL, &fct.ptr, status, 0);
164 }
165
166 return status == NSS_STATUS_SUCCESS;
167}
168#ifdef EXPORT_RPC_SYMBOLS
169libc_hidden_def (netname2user)
170#else
171libc_hidden_nolink_sunrpc (netname2user, GLIBC_2_1)
172#endif
173
174int
175netname2host (const char *netname, char *hostname, const int hostlen)
176{
177 char *p1, *p2;
178
179 p1 = strchr (netname, '.');
180 if (p1 == NULL)
181 return 0;
182 p1++;
183
184 p2 = strchr (p1, '@');
185 if (p2 == NULL)
186 return 0;
187 *p2 = '\0';
188
189 if (hostlen > MAXNETNAMELEN)
190 return 0;
191
192 strncpy (hostname, p1, hostlen);
193 hostname[hostlen] = '\0';
194
195 return 1;
196}
197libc_hidden_nolink_sunrpc (netname2host, GLIBC_2_1)
198