1 | /* Copyright (C) 1997-2019 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 | <http://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 */ |
29 | static const char OPSYS[] = "unix" ; |
30 | |
31 | int |
32 | user2netname (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 | } |
58 | libc_hidden_nolink_sunrpc (user2netname, GLIBC_2_1) |
59 | |
60 | int |
61 | host2netname (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 |
120 | libc_hidden_def (host2netname) |
121 | #else |
122 | libc_hidden_nolink_sunrpc (host2netname, GLIBC_2_1) |
123 | #endif |
124 | |
125 | int |
126 | getnetname (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 | } |
138 | libc_hidden_nolink_sunrpc (getnetname, GLIBC_2_1) |
139 | |
140 | /* Type of the lookup function for netname2user. */ |
141 | typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1], |
142 | uid_t *, gid_t *, int *, gid_t *); |
143 | |
144 | int |
145 | netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp, |
146 | int *gidlenp, gid_t * gidlist) |
147 | { |
148 | static service_user *startp; |
149 | static netname2user_function start_fct; |
150 | service_user *nip; |
151 | union |
152 | { |
153 | netname2user_function f; |
154 | void *ptr; |
155 | } fct; |
156 | enum nss_status status = NSS_STATUS_UNAVAIL; |
157 | int no_more; |
158 | |
159 | if (startp == NULL) |
160 | { |
161 | no_more = __nss_publickey_lookup2 (&nip, "netname2user" , NULL, &fct.ptr); |
162 | if (no_more) |
163 | startp = (service_user *) - 1; |
164 | else |
165 | { |
166 | startp = nip; |
167 | start_fct = fct.f; |
168 | } |
169 | } |
170 | else |
171 | { |
172 | fct.f = start_fct; |
173 | no_more = (nip = startp) == (service_user *) - 1; |
174 | } |
175 | |
176 | while (!no_more) |
177 | { |
178 | status = (*fct.f) (netname, uidp, gidp, gidlenp, gidlist); |
179 | |
180 | no_more = __nss_next2 (&nip, "netname2user" , NULL, &fct.ptr, status, 0); |
181 | } |
182 | |
183 | return status == NSS_STATUS_SUCCESS; |
184 | } |
185 | #ifdef EXPORT_RPC_SYMBOLS |
186 | libc_hidden_def (netname2user) |
187 | #else |
188 | libc_hidden_nolink_sunrpc (netname2user, GLIBC_2_1) |
189 | #endif |
190 | |
191 | int |
192 | netname2host (const char netname[MAXNETNAMELEN + 1], char *hostname, |
193 | const int hostlen) |
194 | { |
195 | char *p1, *p2; |
196 | |
197 | p1 = strchr (netname, '.'); |
198 | if (p1 == NULL) |
199 | return 0; |
200 | p1++; |
201 | |
202 | p2 = strchr (p1, '@'); |
203 | if (p2 == NULL) |
204 | return 0; |
205 | *p2 = '\0'; |
206 | |
207 | if (hostlen > MAXNETNAMELEN) |
208 | return 0; |
209 | |
210 | strncpy (hostname, p1, hostlen); |
211 | hostname[hostlen] = '\0'; |
212 | |
213 | return 1; |
214 | } |
215 | libc_hidden_nolink_sunrpc (netname2host, GLIBC_2_1) |
216 | |