File: nis_subr.c

package info (click to toggle)
glibc 2.23-4
  • links: PTS, VCS
  • area: main
  • in suites: jessie-backports
  • size: 233,552 kB
  • sloc: ansic: 987,702; asm: 260,118; sh: 10,380; makefile: 9,474; python: 3,957; cpp: 3,956; perl: 2,207; awk: 1,907; pascal: 1,527; yacc: 291; sed: 80
file content (351 lines) | stat: -rw-r--r-- 7,367 bytes parent folder | download | duplicates (4)
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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/* Copyright (c) 1997-2016 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <string.h>
#include <rpcsvc/nis.h>

nis_name
nis_leaf_of (const_nis_name name)
{
  static char result[NIS_MAXNAMELEN + 1];

  return nis_leaf_of_r (name, result, NIS_MAXNAMELEN);
}

nis_name
nis_leaf_of_r (const_nis_name name, char *buffer, size_t buflen)
{
  size_t i = 0;

  buffer[0] = '\0';

  while (name[i] != '.' && name[i] != '\0')
    i++;

  if (__glibc_unlikely (i >= buflen))
    {
      __set_errno (ERANGE);
      return NULL;
    }

  *((char *) __mempcpy (buffer, name, i)) = '\0';

  return buffer;
}
libnsl_hidden_def (nis_leaf_of_r)

nis_name
nis_name_of (const_nis_name name)
{
  static char result[NIS_MAXNAMELEN + 1];

  return nis_name_of_r (name, result, NIS_MAXNAMELEN);
}

nis_name
nis_name_of_r (const_nis_name name, char *buffer, size_t buflen)
{
  char *local_domain;
  int diff;

  local_domain = nis_local_directory ();

  diff = strlen (name) - strlen (local_domain);
  if (diff <= 0)
    return NULL;

  if (strcmp (&name[diff], local_domain) != 0)
    return NULL;

  if ((size_t) diff >= buflen)
    {
      __set_errno (ERANGE);
      return NULL;
    }

  *((char *) __mempcpy (buffer, name, diff - 1)) = '\0';

  if (diff - 1 == 0)
    return NULL;

  return buffer;
}
libnsl_hidden_def (nis_name_of_r)

static int __always_inline
count_dots (const_nis_name str)
{
  int count = 0;

  for (size_t i = 0; str[i] != '\0'; ++i)
    if (str[i] == '.')
      ++count;

  return count;
}

/* If we run out of memory, we don't give already allocated memory
   free. The overhead for bringing getnames back in a safe state to
   free it is to big. */
nis_name *
nis_getnames (const_nis_name name)
{
  const char *local_domain = nis_local_directory ();
  size_t local_domain_len = strlen (local_domain);
  size_t name_len = strlen (name);
  char *path;
  int pos = 0;
  char *saveptr = NULL;
  int have_point;
  const char *cp;
  const char *cp2;

  int count = 2;
  nis_name *getnames = malloc ((count + 1) * sizeof (char *));
  if (__glibc_unlikely (getnames == NULL))
      return NULL;

  /* Do we have a fully qualified NIS+ name ? If yes, give it back */
  if (name[name_len - 1] == '.')
    {
      if ((getnames[0] = strdup (name)) == NULL)
	{
	free_null:
	  while (pos-- > 0)
	    free (getnames[pos]);
	  free (getnames);
	  return NULL;
	}

      getnames[1] = NULL;

      return getnames;
    }

  /* If the passed NAME is shared a suffix (the latter of course with
     a final dot) with each other we pass back NAME with a final
     dot.  */
  if (local_domain_len > 2)
    {
      have_point = 0;
      cp = &local_domain[local_domain_len - 2];
      cp2 = &name[name_len - 1];

      while (*cp == *cp2)
	{
	  if (*cp == '.')
	    have_point = 1;
	  --cp;
	  --cp2;
	  if (cp < local_domain)
	    {
	      have_point = cp2 < name || *cp2 == '.';
	      break;
	    }
	  if (cp2 < name)
	    {
	      have_point = *cp == '.';
	      break;
	    }
	}

      if (have_point)
	{
	  getnames[0] = malloc (name_len + 2);
	  if (getnames[0] == NULL)
	    goto free_null;

	  strcpy (stpcpy (getnames[0], name), ".");
	  ++pos;
	}
    }

  /* Get the search path, where we have to search "name" */
  path = getenv ("NIS_PATH");
  if (path == NULL)
    path = strdupa ("$");
  else
    path = strdupa (path);

  have_point = strchr (name, '.') != NULL;

  cp = __strtok_r (path, ":", &saveptr);
  while (cp)
    {
      if (strcmp (cp, "$") == 0)
	{
	  const char *cptr = local_domain;
	  char *tmp;

	  while (*cptr != '\0' && count_dots (cptr) >= 2)
	    {
	      if (pos >= count)
		{
		  count += 5;
		  nis_name *newp = realloc (getnames,
					    (count + 1) * sizeof (char *));
		  if (__glibc_unlikely (newp == NULL))
		    goto free_null;
		  getnames = newp;
		}
	      tmp = malloc (strlen (cptr) + local_domain_len + name_len + 2);
	      if (__glibc_unlikely (tmp == NULL))
		goto free_null;

	      getnames[pos] = tmp;
	      tmp = stpcpy (tmp, name);
	      *tmp++ = '.';
	      if (cptr[1] != '\0')
		stpcpy (tmp, cptr);
	      else
		++cptr;

	      ++pos;

	      while (*cptr != '.' && *cptr != '\0')
		++cptr;
	      if (cptr[0] != '\0' && cptr[1] != '\0')
		/* If we have only ".", don't remove the "." */
		++cptr;
	    }
	}
      else
	{
	  char *tmp;
	  size_t cplen = strlen (cp);

	  if (cp[cplen - 1] == '$')
	    {
	      char *p;

	      tmp = malloc (cplen + local_domain_len + name_len + 2);
	      if (__glibc_unlikely (tmp == NULL))
		goto free_null;

	      p = __stpcpy (tmp, name);
	      *p++ = '.';
	      p = __mempcpy (p, cp, cplen);
	      --p;
	      if (p[-1] != '.')
		*p++ = '.';
	      __stpcpy (p, local_domain);
	    }
	  else
	    {
	      char *p;

	      tmp = malloc (cplen + name_len + 3);
	      if (__glibc_unlikely (tmp == NULL))
		goto free_null;

	      p = __mempcpy (tmp, name, name_len);
	      *p++ = '.';
	      p = __mempcpy (p, cp, cplen);
	      if (p[-1] != '.')
		*p++ = '.';
	      *p = '\0';
	    }

	  if (pos >= count)
	    {
	      count += 5;
	      nis_name *newp = realloc (getnames,
					(count + 1) * sizeof (char *));
	      if (__glibc_unlikely (newp == NULL))
		goto free_null;
	      getnames = newp;
	    }
	  getnames[pos] = tmp;
	  ++pos;
	}
      cp = __strtok_r (NULL, ":", &saveptr);
    }

  if (pos == 0
      && __asprintf (&getnames[pos++], "%s%s%s%s",
		     name, name[name_len - 1] == '.' ? "" : ".",
		     local_domain,
		     local_domain[local_domain_len - 1] == '.' ? "" : ".") < 0)
    goto free_null;

  getnames[pos] = NULL;

  return getnames;
}
libnsl_hidden_def (nis_getnames)

void
nis_freenames (nis_name *names)
{
  int i = 0;

  while (names[i] != NULL)
    {
      free (names[i]);
      ++i;
    }

  free (names);
}
libnsl_hidden_def  (nis_freenames)

name_pos
nis_dir_cmp (const_nis_name n1, const_nis_name n2)
{
  int len1, len2;

  len1 = strlen (n1);
  len2 = strlen (n2);

  if (len1 == len2)
    {
      if (strcmp (n1, n2) == 0)
	return SAME_NAME;
      else
	return NOT_SEQUENTIAL;
    }

  if (len1 < len2)
    {
      if (n2[len2 - len1 - 1] != '.')
	return NOT_SEQUENTIAL;
      else if (strcmp (&n2[len2 - len1], n1) == 0)
	return HIGHER_NAME;
      else
	return NOT_SEQUENTIAL;
    }
  else
    {
      if (n1[len1 - len2 - 1] != '.')
	return NOT_SEQUENTIAL;
      else if (strcmp (&n1[len1 - len2], n2) == 0)
	return LOWER_NAME;
      else
	return NOT_SEQUENTIAL;

    }
}
libnsl_hidden_def (nis_dir_cmp)

void
nis_destroy_object (nis_object *obj)
{
  nis_free_object (obj);
}
libnsl_hidden_def (nis_destroy_object)