1 /* Copyright (C) 1997-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
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.
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.
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/>. */
25 #include <rpcsvc/nis.h>
26 #include <bits/libc-lock.h>
28 #include "nss-nisplus.h"
30 __libc_lock_define_initialized (static, lock);
32 static nis_result *result;
33 static nis_name tablename_val;
34 static u_long tablename_len;
36 #define NISENTRYVAL(idx, col, res) \
37 (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
39 #define NISENTRYLEN(idx, col, res) \
40 (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
44 _nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
45 char *buffer, size_t buflen, int *errnop)
47 char *first_unused = buffer;
48 size_t room_left = buflen;
53 if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
54 || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
55 || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type, "services_tbl") != 0
56 || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4)
59 if (NISENTRYLEN (0, 0, result) >= room_left)
65 strncpy (first_unused, NISENTRYVAL (0, 0, result),
66 NISENTRYLEN (0, 0, result));
67 first_unused[NISENTRYLEN (0, 0, result)] = '\0';
68 serv->s_name = first_unused;
69 size_t len = strlen (first_unused) + 1;
73 if (NISENTRYLEN (0, 2, result) >= room_left)
75 strncpy (first_unused, NISENTRYVAL (0, 2, result),
76 NISENTRYLEN (0, 2, result));
77 first_unused[NISENTRYLEN (0, 2, result)] = '\0';
78 serv->s_proto = first_unused;
79 len = strlen (first_unused) + 1;
83 serv->s_port = htons (atoi (NISENTRYVAL (0, 3, result)));
85 /* XXX Rewrite at some point to allocate the array first and then
86 copy the strings. It wasteful to first concatenate the strings
87 to just split them again later. */
88 char *line = first_unused;
89 for (unsigned int i = 0; i < NIS_RES_NUMOBJ (result); ++i)
91 if (strcmp (NISENTRYVAL (i, 1, result), serv->s_name) != 0)
93 if (NISENTRYLEN (i, 1, result) + 2 > room_left)
95 *first_unused++ = ' ';
96 first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
97 NISENTRYLEN (i, 1, result));
98 room_left -= NISENTRYLEN (i, 1, result) + 1;
101 *first_unused++ = '\0';
103 /* Adjust the pointer so it is aligned for
105 size_t adjust = ((__alignof__ (char *)
106 - (first_unused - (char *) 0) % __alignof__ (char *))
107 % __alignof__ (char *));
108 if (room_left < adjust + sizeof (char *))
110 first_unused += adjust;
112 serv->s_aliases = (char **) first_unused;
114 /* For the terminating NULL pointer. */
115 room_left -= (sizeof (char *));
118 while (*line != '\0')
120 /* Skip leading blanks. */
121 while (isspace (*line))
127 if (room_left < sizeof (char *))
130 room_left -= sizeof (char *);
131 serv->s_aliases[i++] = line;
133 while (*line != '\0' && *line != ' ')
139 serv->s_aliases[i] = NULL;
145 static enum nss_status
146 _nss_create_tablename (int *errnop)
148 if (tablename_val == NULL)
150 const char *local_dir = nis_local_directory ();
151 size_t local_dir_len = strlen (local_dir);
152 static const char prefix[] = "services.org_dir.";
154 char *p = malloc (sizeof (prefix) + local_dir_len);
158 return NSS_STATUS_TRYAGAIN;
161 memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
163 tablename_len = sizeof (prefix) - 1 + local_dir_len;
165 atomic_write_barrier ();
170 return NSS_STATUS_SUCCESS;
175 _nss_nisplus_setservent (int stayopen)
177 enum nss_status status = NSS_STATUS_SUCCESS;
180 __libc_lock_lock (lock);
184 nis_freeresult (result);
188 if (tablename_val == NULL)
189 status = _nss_create_tablename (&err);
191 __libc_lock_unlock (lock);
197 _nss_nisplus_endservent (void)
199 __libc_lock_lock (lock);
203 nis_freeresult (result);
207 __libc_lock_unlock (lock);
209 return NSS_STATUS_SUCCESS;
212 static enum nss_status
213 internal_nisplus_getservent_r (struct servent *serv, char *buffer,
214 size_t buflen, int *errnop)
218 /* Get the next entry until we found a correct one. */
221 nis_result *saved_res;
226 if (tablename_val == NULL)
228 enum nss_status status = _nss_create_tablename (errnop);
230 if (status != NSS_STATUS_SUCCESS)
234 result = nis_first_entry (tablename_val);
238 return NSS_STATUS_TRYAGAIN;
240 if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
241 return niserr2nss (result->status);
246 result = nis_next_entry (tablename_val, &result->cookie);
250 return NSS_STATUS_TRYAGAIN;
252 if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
254 nis_freeresult (saved_res);
255 return niserr2nss (result->status);
259 parse_res = _nss_nisplus_parse_servent (result, serv, buffer,
261 if (__builtin_expect (parse_res == -1, 0))
263 nis_freeresult (result);
266 return NSS_STATUS_TRYAGAIN;
271 nis_freeresult (saved_res);
276 return NSS_STATUS_SUCCESS;
280 _nss_nisplus_getservent_r (struct servent *result, char *buffer,
281 size_t buflen, int *errnop)
283 __libc_lock_lock (lock);
285 int status = internal_nisplus_getservent_r (result, buffer, buflen, errnop);
287 __libc_lock_unlock (lock);
293 _nss_nisplus_getservbyname_r (const char *name, const char *protocol,
294 struct servent *serv,
295 char *buffer, size_t buflen, int *errnop)
297 if (tablename_val == NULL)
299 __libc_lock_lock (lock);
301 enum nss_status status = _nss_create_tablename (errnop);
303 __libc_lock_unlock (lock);
305 if (status != NSS_STATUS_SUCCESS)
309 if (name == NULL || protocol == NULL)
312 return NSS_STATUS_NOTFOUND;
315 size_t protocol_len = strlen (protocol);
316 char buf[strlen (name) + protocol_len + 17 + tablename_len];
319 /* Search at first in the alias list, and use the correct name
320 for the next search */
321 snprintf (buf, sizeof (buf), "[name=%s,proto=%s],%s", name, protocol,
323 nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
330 /* If we did not find it, try it as original name. But if the
331 database is correct, we should find it in the first case, too */
332 if ((result->status != NIS_SUCCESS
333 && result->status != NIS_S_SUCCESS)
334 || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
335 || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
337 || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4)
338 snprintf (buf, sizeof (buf), "[cname=%s,proto=%s],%s", name, protocol,
342 /* We need to allocate a new buffer since there is no
343 guarantee the returned name has a length limit. */
344 const char *entryval = NISENTRYVAL(0, 0, result);
345 size_t buflen = (strlen (entryval) + protocol_len + 17
347 bufptr = alloca (buflen);
348 snprintf (bufptr, buflen, "[cname=%s,proto=%s],%s",
349 entryval, protocol, tablename_val);
352 nis_freeresult (result);
353 result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
360 return NSS_STATUS_TRYAGAIN;
363 if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
365 enum nss_status status = niserr2nss (result->status);
367 __set_errno (olderr);
369 nis_freeresult (result);
373 int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
375 nis_freeresult (result);
377 if (__builtin_expect (parse_res < 1, 0))
382 return NSS_STATUS_TRYAGAIN;
386 __set_errno (olderr);
387 return NSS_STATUS_NOTFOUND;
391 return NSS_STATUS_SUCCESS;
395 _nss_nisplus_getservbyport_r (const int number, const char *protocol,
396 struct servent *serv,
397 char *buffer, size_t buflen, int *errnop)
399 if (tablename_val == NULL)
401 __libc_lock_lock (lock);
403 enum nss_status status = _nss_create_tablename (errnop);
405 __libc_lock_unlock (lock);
407 if (status != NSS_STATUS_SUCCESS)
411 if (protocol == NULL)
414 return NSS_STATUS_NOTFOUND;
417 char buf[17 + 3 * sizeof (int) + strlen (protocol) + tablename_len];
420 snprintf (buf, sizeof (buf), "[port=%d,proto=%s],%s",
421 number, protocol, tablename_val);
423 nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
429 return NSS_STATUS_TRYAGAIN;
432 if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
434 enum nss_status status = niserr2nss (result->status);
436 __set_errno (olderr);
438 nis_freeresult (result);
442 int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
444 nis_freeresult (result);
446 if (__builtin_expect (parse_res < 1, 0))
451 return NSS_STATUS_TRYAGAIN;
455 __set_errno (olderr);
456 return NSS_STATUS_NOTFOUND;
460 return NSS_STATUS_SUCCESS;