1 | /* Copyright (C) 1997-2016 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 | |
24 | #include "nsswitch.h" |
25 | |
26 | #define OPSYS_LEN 4 |
27 | #define MAXIPRINT (11) /* max length of printed integer */ |
28 | static const char OPSYS[] = "unix" ; |
29 | |
30 | int |
31 | user2netname (char netname[MAXNETNAMELEN + 1], const uid_t uid, |
32 | const char *domain) |
33 | { |
34 | char dfltdom[MAXNETNAMELEN + 1]; |
35 | size_t i; |
36 | |
37 | if (domain == NULL) |
38 | { |
39 | if (getdomainname (dfltdom, sizeof (dfltdom)) < 0) |
40 | return 0; |
41 | } |
42 | else |
43 | { |
44 | strncpy (dfltdom, domain, MAXNETNAMELEN); |
45 | dfltdom[MAXNETNAMELEN] = '\0'; |
46 | } |
47 | |
48 | if ((strlen (dfltdom) + OPSYS_LEN + 3 + MAXIPRINT) > (size_t) MAXNETNAMELEN) |
49 | return 0; |
50 | |
51 | sprintf (netname, "%s.%d@%s" , OPSYS, uid, dfltdom); |
52 | i = strlen (netname); |
53 | if (netname[i - 1] == '.') |
54 | netname[i - 1] = '\0'; |
55 | return 1; |
56 | } |
57 | libc_hidden_nolink_sunrpc (user2netname, GLIBC_2_1) |
58 | |
59 | int |
60 | host2netname (char netname[MAXNETNAMELEN + 1], const char *host, |
61 | const char *domain) |
62 | { |
63 | char *p; |
64 | char hostname[MAXHOSTNAMELEN + 1]; |
65 | char domainname[MAXHOSTNAMELEN + 1]; |
66 | char *dot_in_host; |
67 | size_t i; |
68 | |
69 | netname[0] = '\0'; /* make null first (no need for memset) */ |
70 | |
71 | if (host == NULL) |
72 | __gethostname (hostname, MAXHOSTNAMELEN); |
73 | else |
74 | { |
75 | strncpy (hostname, host, MAXHOSTNAMELEN); |
76 | hostname[MAXHOSTNAMELEN] = '\0'; |
77 | } |
78 | |
79 | dot_in_host = strchr (hostname, '.'); |
80 | if (domain == NULL) |
81 | { |
82 | p = dot_in_host; |
83 | if (p) |
84 | { |
85 | ++p; |
86 | strncpy (domainname, p, MAXHOSTNAMELEN); |
87 | domainname[MAXHOSTNAMELEN] = '\0'; |
88 | } |
89 | else |
90 | { |
91 | domainname[0] = 0; |
92 | getdomainname (domainname, MAXHOSTNAMELEN); |
93 | } |
94 | } |
95 | else |
96 | { |
97 | strncpy (domainname, domain, MAXHOSTNAMELEN); |
98 | domainname[MAXHOSTNAMELEN] = '\0'; |
99 | } |
100 | |
101 | i = strlen (domainname); |
102 | if (i == 0) |
103 | /* No domainname */ |
104 | return 0; |
105 | if (domainname[i - 1] == '.') |
106 | domainname[i - 1] = 0; |
107 | |
108 | if (dot_in_host) /* strip off rest of name */ |
109 | *dot_in_host = '\0'; |
110 | |
111 | if ((strlen (domainname) + strlen (hostname) + OPSYS_LEN + 3) |
112 | > MAXNETNAMELEN) |
113 | return 0; |
114 | |
115 | sprintf (netname, "%s.%s@%s" , OPSYS, hostname, domainname); |
116 | return 1; |
117 | } |
118 | #ifdef EXPORT_RPC_SYMBOLS |
119 | libc_hidden_def (host2netname) |
120 | #else |
121 | libc_hidden_nolink_sunrpc (host2netname, GLIBC_2_1) |
122 | #endif |
123 | |
124 | int |
125 | getnetname (char name[MAXNETNAMELEN + 1]) |
126 | { |
127 | uid_t uid; |
128 | int dummy; |
129 | |
130 | uid = __geteuid (); |
131 | if (uid == 0) |
132 | dummy = host2netname (name, NULL, NULL); |
133 | else |
134 | dummy = user2netname (name, uid, NULL); |
135 | return (dummy); |
136 | } |
137 | libc_hidden_nolink_sunrpc (getnetname, GLIBC_2_1) |
138 | |
139 | /* Type of the lookup function for netname2user. */ |
140 | typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1], |
141 | uid_t *, gid_t *, int *, gid_t *); |
142 | /* The lookup function for the first entry of this service. */ |
143 | extern int __nss_publickey_lookup (service_user ** nip, const char *name, |
144 | void **fctp) internal_function; |
145 | |
146 | int |
147 | netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp, |
148 | int *gidlenp, gid_t * gidlist) |
149 | { |
150 | static service_user *startp; |
151 | static netname2user_function start_fct; |
152 | service_user *nip; |
153 | union |
154 | { |
155 | netname2user_function f; |
156 | void *ptr; |
157 | } fct; |
158 | enum nss_status status = NSS_STATUS_UNAVAIL; |
159 | int no_more; |
160 | |
161 | if (startp == NULL) |
162 | { |
163 | no_more = __nss_publickey_lookup (&nip, "netname2user" , &fct.ptr); |
164 | if (no_more) |
165 | startp = (service_user *) - 1; |
166 | else |
167 | { |
168 | startp = nip; |
169 | start_fct = fct.f; |
170 | } |
171 | } |
172 | else |
173 | { |
174 | fct.f = start_fct; |
175 | no_more = (nip = startp) == (service_user *) - 1; |
176 | } |
177 | |
178 | while (!no_more) |
179 | { |
180 | status = (*fct.f) (netname, uidp, gidp, gidlenp, gidlist); |
181 | |
182 | no_more = __nss_next2 (&nip, "netname2user" , NULL, &fct.ptr, status, 0); |
183 | } |
184 | |
185 | return status == NSS_STATUS_SUCCESS; |
186 | } |
187 | #ifdef EXPORT_RPC_SYMBOLS |
188 | libc_hidden_def (netname2user) |
189 | #else |
190 | libc_hidden_nolink_sunrpc (netname2user, GLIBC_2_1) |
191 | #endif |
192 | |
193 | int |
194 | netname2host (const char netname[MAXNETNAMELEN + 1], char *hostname, |
195 | const int hostlen) |
196 | { |
197 | char *p1, *p2; |
198 | |
199 | p1 = strchr (netname, '.'); |
200 | if (p1 == NULL) |
201 | return 0; |
202 | p1++; |
203 | |
204 | p2 = strchr (p1, '@'); |
205 | if (p2 == NULL) |
206 | return 0; |
207 | *p2 = '\0'; |
208 | |
209 | if (hostlen > MAXNETNAMELEN) |
210 | return 0; |
211 | |
212 | strncpy (hostname, p1, hostlen); |
213 | hostname[hostlen] = '\0'; |
214 | |
215 | return 1; |
216 | } |
217 | libc_hidden_nolink_sunrpc (netname2host, GLIBC_2_1) |
218 | |