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f7ddf3d3 | 1 | /* Copyright (C) 1997, 1998, 1999, 2002 Free Software Foundation, Inc. |
800d775e UD |
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 | |
41bdb6e2 AJ |
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. | |
800d775e UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
800d775e | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
800d775e UD |
19 | |
20 | #include <stdio.h> | |
21 | #include <unistd.h> | |
22 | #include <string.h> | |
23 | #include <rpc/rpc.h> | |
24 | ||
25 | #include "nsswitch.h" | |
26 | ||
27 | #define OPSYS_LEN 4 | |
28 | #define MAXIPRINT (11) /* max length of printed integer */ | |
c4563d2d | 29 | static const char OPSYS[] = "unix"; |
800d775e UD |
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 | ||
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) | |
50304ef0 | 72 | __gethostname (hostname, MAXHOSTNAMELEN); |
800d775e UD |
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 | { | |
26a60f90 | 85 | ++p; |
800d775e UD |
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 | ||
119 | int | |
120 | getnetname (char name[MAXNETNAMELEN + 1]) | |
121 | { | |
122 | uid_t uid; | |
123 | int dummy; | |
124 | ||
50304ef0 | 125 | uid = __geteuid (); |
800d775e UD |
126 | if (uid == 0) |
127 | dummy = host2netname (name, NULL, NULL); | |
128 | else | |
129 | dummy = user2netname (name, uid, NULL); | |
130 | return (dummy); | |
131 | } | |
132 | ||
133 | /* Type of the lookup function for netname2user. */ | |
134 | typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1], | |
135 | uid_t *, gid_t *, int *, gid_t *); | |
136 | /* The lookup function for the first entry of this service. */ | |
137 | extern int __nss_publickey_lookup (service_user ** nip, const char *name, | |
f7ddf3d3 | 138 | void **fctp) internal_function; |
800d775e UD |
139 | |
140 | int | |
141 | netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp, | |
142 | int *gidlenp, gid_t * gidlist) | |
143 | { | |
c4563d2d | 144 | static service_user *startp; |
800d775e UD |
145 | static netname2user_function start_fct; |
146 | service_user *nip; | |
147 | netname2user_function fct; | |
148 | enum nss_status status = NSS_STATUS_UNAVAIL; | |
149 | int no_more; | |
150 | ||
151 | if (startp == NULL) | |
152 | { | |
153 | no_more = __nss_publickey_lookup (&nip, "netname2user", (void **) &fct); | |
154 | if (no_more) | |
155 | startp = (service_user *) - 1; | |
156 | else | |
157 | { | |
158 | startp = nip; | |
159 | start_fct = fct; | |
160 | } | |
161 | } | |
162 | else | |
163 | { | |
164 | fct = start_fct; | |
165 | no_more = (nip = startp) == (service_user *) - 1; | |
166 | } | |
167 | ||
168 | while (!no_more) | |
169 | { | |
170 | status = (*fct) (netname, uidp, gidp, gidlenp, gidlist); | |
171 | ||
172 | no_more = __nss_next (&nip, "netname2user", (void **) &fct, status, 0); | |
173 | } | |
174 | ||
175 | return status == NSS_STATUS_SUCCESS; | |
176 | } | |
177 | ||
178 | int | |
179 | netname2host (const char netname[MAXNETNAMELEN + 1], char *hostname, | |
180 | const int hostlen) | |
181 | { | |
182 | char *p1, *p2; | |
183 | char buffer[MAXNETNAMELEN + 1]; | |
184 | ||
185 | p1 = strchr (buffer, '.'); | |
186 | if (p1 == NULL) | |
187 | return 0; | |
188 | p1++; | |
189 | ||
190 | p2 = strchr (p1, '@'); | |
191 | if (p2 == NULL) | |
192 | return 0; | |
193 | *p2 = '\0'; | |
194 | ||
195 | if (hostlen > MAXNETNAMELEN) | |
196 | return 0; | |
197 | ||
198 | strncpy (hostname, p1, hostlen); | |
199 | hostname[hostlen] = '\0'; | |
200 | ||
201 | return 1; | |
202 | } |