1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <rpc/rpc.h>
#include "nsswitch.h"
#define OPSYS_LEN 4
#define MAXIPRINT (11) /* max length of printed integer */
static const char *OPSYS = "unix";
int
user2netname (char netname[MAXNETNAMELEN + 1], const uid_t uid,
const char *domain)
{
char dfltdom[MAXNETNAMELEN + 1];
size_t i;
if (domain == NULL)
{
if (getdomainname (dfltdom, sizeof (dfltdom)) < 0)
return 0;
}
else
{
strncpy (dfltdom, domain, MAXNETNAMELEN);
dfltdom[MAXNETNAMELEN] = '\0';
}
if ((strlen (dfltdom) + OPSYS_LEN + 3 + MAXIPRINT) > (size_t) MAXNETNAMELEN)
return 0;
sprintf (netname, "%s.%d@%s", OPSYS, uid, dfltdom);
i = strlen (netname);
if (netname[i - 1] == '.')
netname[i - 1] = '\0';
return 1;
}
int
host2netname (char netname[MAXNETNAMELEN + 1], const char *host,
const char *domain)
{
char *p;
char hostname[MAXHOSTNAMELEN + 1];
char domainname[MAXHOSTNAMELEN + 1];
char *dot_in_host;
size_t i;
netname[0] = '\0'; /* make null first (no need for memset) */
if (host == NULL)
gethostname (hostname, MAXHOSTNAMELEN);
else
{
strncpy (hostname, host, MAXHOSTNAMELEN);
hostname[MAXHOSTNAMELEN] = '\0';
}
dot_in_host = strchr (hostname, '.');
if (domain == NULL)
{
p = dot_in_host;
if (p)
{
strncpy (domainname, p, MAXHOSTNAMELEN);
domainname[MAXHOSTNAMELEN] = '\0';
}
else
{
domainname[0] = 0;
getdomainname (domainname, MAXHOSTNAMELEN);
}
}
else
{
strncpy (domainname, domain, MAXHOSTNAMELEN);
domainname[MAXHOSTNAMELEN] = '\0';
}
i = strlen (domainname);
if (i == 0)
/* No domainname */
return 0;
if (domainname[i - 1] == '.')
domainname[i - 1] = 0;
if (dot_in_host) /* strip off rest of name */
*dot_in_host = '\0';
if ((strlen (domainname) + strlen (hostname) + OPSYS_LEN + 3)
> MAXNETNAMELEN)
return 0;
sprintf (netname, "%s.%s@%s", OPSYS, hostname, domainname);
return 1;
}
int
getnetname (char name[MAXNETNAMELEN + 1])
{
uid_t uid;
int dummy;
uid = geteuid ();
if (uid == 0)
dummy = host2netname (name, NULL, NULL);
else
dummy = user2netname (name, uid, NULL);
return (dummy);
}
/* Type of the lookup function for netname2user. */
typedef int (*netname2user_function) (const char netname[MAXNETNAMELEN + 1],
uid_t *, gid_t *, int *, gid_t *);
/* The lookup function for the first entry of this service. */
extern int __nss_publickey_lookup (service_user ** nip, const char *name,
void **fctp);
int
netname2user (const char netname[MAXNETNAMELEN + 1], uid_t * uidp, gid_t * gidp,
int *gidlenp, gid_t * gidlist)
{
static service_user *startp = NULL;
static netname2user_function start_fct;
service_user *nip;
netname2user_function fct;
enum nss_status status = NSS_STATUS_UNAVAIL;
int no_more;
if (startp == NULL)
{
no_more = __nss_publickey_lookup (&nip, "netname2user", (void **) &fct);
if (no_more)
startp = (service_user *) - 1;
else
{
startp = nip;
start_fct = fct;
}
}
else
{
fct = start_fct;
no_more = (nip = startp) == (service_user *) - 1;
}
while (!no_more)
{
status = (*fct) (netname, uidp, gidp, gidlenp, gidlist);
no_more = __nss_next (&nip, "netname2user", (void **) &fct, status, 0);
}
return status == NSS_STATUS_SUCCESS;
}
int
netname2host (const char netname[MAXNETNAMELEN + 1], char *hostname,
const int hostlen)
{
char *p1, *p2;
char buffer[MAXNETNAMELEN + 1];
p1 = strchr (buffer, '.');
if (p1 == NULL)
return 0;
p1++;
p2 = strchr (p1, '@');
if (p2 == NULL)
return 0;
*p2 = '\0';
if (hostlen > MAXNETNAMELEN)
return 0;
strncpy (hostname, p1, hostlen);
hostname[hostlen] = '\0';
return 1;
}
|
