summaryrefslogtreecommitdiff
path: root/nis/nis_local_names.c
blob: 22601a46aa8bc37fa0c684ebe7d238e51177764f (plain)
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
/* Copyright (c) 1997, 1998 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 <errno.h>
#include <string.h>
#include <unistd.h>
#include <rpcsvc/nis.h>

nis_name
nis_local_group (void)
{
  static char __nisgroup[NIS_MAXNAMELEN + 1];

  if (__nisgroup[0] == '\0')
    {
      char *cptr;
      char *cp;

      if ((cptr = getenv ("NIS_GROUP")) == NULL)
	return __nisgroup;

      if (strlen (cptr) >= NIS_MAXNAMELEN)
	return __nisgroup;

      cp = stpcpy (__nisgroup, cptr);

      if (cp[-1] != '.')
	{
	  cptr = nis_local_directory ();
	  if ((cp - __nisgroup) + strlen (cptr) + 1 < NIS_MAXNAMELEN)
	    {
	      *cp++ = '.';
	      strcpy (cp, cptr);
	    }
	  else
	    __nisgroup[0] = '\0';
	}
    }

  return __nisgroup;
}


nis_name
nis_local_directory (void)
{
  static char __nisdomainname[NIS_MAXNAMELEN + 1];

  if (__nisdomainname[0] == '\0')
    {
      if (getdomainname (__nisdomainname, NIS_MAXNAMELEN) < 0)
	__nisdomainname[0] = '\0';
      else
	{
	  char *cp = strchr (__nisdomainname, '\0');

	  /* Missing trailing dot? */
	  if (cp[-1] != '.')
	    {
	      *cp++ = '.';
	      *cp = '\0';
	    }
	}
    }

  return __nisdomainname;
}

nis_name
nis_local_principal (void)
{
  static char __principal[NIS_MAXNAMELEN + 1];

  if (__principal[0] == '\0')
    {
      char buf[NIS_MAXNAMELEN + 1];
      nis_result *res;
      uid_t uid = geteuid ();

      if (uid != 0)
	{
	  int len = snprintf (buf, NIS_MAXNAMELEN - 1,
			      "[auth_name=%d,auth_type=LOCAL],cred.org_dir.%s",
			      uid, nis_local_directory ());

	  if (len >= NIS_MAXNAMELEN - 1)
	    /* XXX The buffer is too small.  Can this happen???  */
	    return strcpy (__principal, "nobody");

	  if (buf[len - 1] != '.')
	    {
	      buf[len++] = '.';
	      buf[len] = '\0';
	    }

	  res = nis_list (buf, USE_DGRAM + NO_AUTHINFO + FOLLOW_LINKS +
			  FOLLOW_PATH, NULL, NULL);

	  if (res == NULL)
	    return strcpy (__principal, "nobody");

	  if (NIS_RES_STATUS (res) == NIS_SUCCESS)
	    {
	      if (res->objects.objects_len > 1)
		{
		  /* More than one principal with same uid?  something
		     wrong with cred table.  Should be unique.  Warn user
		     and continue.  */
		  printf (_("\
LOCAL entry for UID %d in directory %s not unique\n"),
			  uid, nis_local_directory ());
		}
	      strcpy (__principal, ENTRY_VAL (res->objects.objects_val, 0));
	      nis_freeresult (res);
	      return __principal;
	    }
	  else
	    {
	      nis_freeresult (res);
	      return strcpy (__principal, "nobody");
	    }
	}
      else
	return strcpy (__principal, nis_local_host ());

      /* Should be never reached */
      return strcpy (__principal, "nobody");
    }
  return __principal;
}

nis_name
nis_local_host (void)
{
  static char __nishostname[NIS_MAXNAMELEN + 1];

  if (__nishostname[0] == '\0')
    {
      if (gethostname (__nishostname, NIS_MAXNAMELEN) < 0)
	__nishostname[0] = '\0';
      else
	{
	  char *cp = strchr (__nishostname, '\0');
	  int len = cp - __nishostname;

	  /* Hostname already fully qualified? */
	  if (cp[-1] == '.')
	    return __nishostname;

	  if (len + strlen (nis_local_directory ()) + 1 > NIS_MAXNAMELEN)
	    {
	      __nishostname[0] = '\0';
	      return __nishostname;
	    }

	  *cp++ = '.';
	  strncpy (cp, nis_local_directory (), NIS_MAXNAMELEN - len -1);
	  __nishostname[NIS_MAXNAMELEN] = '\0';
	}
    }

  return __nishostname;
}