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
|
/* Copyright (c) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _NSCD_H
#define _NSCD_H 1
#include <pthread.h>
#include <stdbool.h>
#include <time.h>
#include <sys/uio.h>
/* The declarations for the request and response types are in the file
"nscd-client.h", which should contain everything needed by client
functions. */
#include "nscd-client.h"
/* Handle databases. */
typedef enum
{
pwddb,
grpdb,
hstdb,
lastdb
} dbtype;
/* Default limit on the number of times a value gets reloaded without
being used in the meantime. NSCD does not throw a value out as
soon as it times out. It tries to reload the value from the
server. Only if the value has not been used for so many rounds it
is removed. */
#define DEFAULT_RELOAD_LIMIT 5
/* Time before restarting the process in paranoia mode. */
#define RESTART_INTERVAL (60 * 60)
/* Structure describing dynamic part of one database. */
struct database_dyn
{
pthread_rwlock_t lock;
int enabled;
int check_file;
int persistent;
int shared;
int propagate;
const char filename[12];
const char *db_filename;
time_t file_mtime;
size_t suggested_module;
size_t max_db_size;
unsigned long int postimeout; /* In seconds. */
unsigned long int negtimeout; /* In seconds. */
int wr_fd; /* Writable file descriptor. */
int ro_fd; /* Unwritable file descriptor. */
const struct iovec *disabled_iov;
struct database_pers_head *head;
char *data;
size_t memsize;
pthread_mutex_t memlock;
bool mmap_used;
bool last_alloc_failed;
};
/* Paths of the file for the persistent storage. */
#define _PATH_NSCD_PASSWD_DB "/var/db/nscd/passwd"
#define _PATH_NSCD_GROUP_DB "/var/db/nscd/group"
#define _PATH_NSCD_HOSTS_DB "/var/db/nscd/hosts"
/* Path used when not using persistent storage. */
#define _PATH_NSCD_XYZ_DB_TMP "/var/run/nscd/dbXXXXXX"
/* Maximum alignment requirement we will encounter. */
#define BLOCK_ALIGN_LOG 3
#define BLOCK_ALIGN (1 << BLOCK_ALIGN_LOG)
#define BLOCK_ALIGN_M1 (BLOCK_ALIGN - 1)
/* Default value for the maximum size of the database files. */
#define DEFAULT_MAX_DB_SIZE (32 * 1024 * 1024)
/* Number of bytes of data we initially reserve for each hash table bucket. */
#define DEFAULT_DATASIZE_PER_BUCKET 1024
/* Global variables. */
extern struct database_dyn dbs[lastdb];
extern const char *dbnames[lastdb];
extern const char *serv2str[LASTREQ];
extern const struct iovec pwd_iov_disabled;
extern const struct iovec grp_iov_disabled;
extern const struct iovec hst_iov_disabled;
/* Initial number of threads to run. */
extern int nthreads;
/* Maximum number of threads to use. */
extern int max_nthreads;
/* User name to run server processes as. */
extern const char *server_user;
/* Name and UID of user who is allowed to request statistics. */
extern const char *stat_user;
extern uid_t stat_uid;
/* Time the server was started. */
extern time_t start_time;
/* Number of times clients had to wait. */
extern unsigned long int client_queued;
/* Maximum needed alignment. */
extern const size_t block_align;
/* Number of times a value is reloaded without being used. UINT_MAX
means unlimited. */
extern unsigned int reload_count;
/* Pagesize minus one. */
extern uintptr_t pagesize_m1;
/* Nonzero if paranoia mode is enabled. */
extern int paranoia;
/* Time after which the process restarts. */
extern time_t restart_time;
/* How much time between restarts. */
extern time_t restart_interval;
/* Old current working directory. */
extern const char *oldcwd;
/* Old user and group ID. */
extern uid_t old_uid;
extern gid_t old_gid;
/* Prototypes for global functions. */
/* nscd.c */
extern void termination_handler (int signum) __attribute__ ((__noreturn__));
extern int nscd_open_socket (void);
/* connections.c */
extern void nscd_init (void);
extern void close_sockets (void);
extern void start_threads (void) __attribute__ ((__noreturn__));
/* nscd_conf.c */
extern int nscd_parse_file (const char *fname,
struct database_dyn dbs[lastdb]);
/* nscd_stat.c */
extern void send_stats (int fd, struct database_dyn dbs[lastdb]);
extern int receive_print_stats (void) __attribute__ ((__noreturn__));
/* cache.c */
extern struct datahead *cache_search (request_type, void *key, size_t len,
struct database_dyn *table,
uid_t owner);
extern int cache_add (int type, const void *key, size_t len,
struct datahead *packet, bool first,
struct database_dyn *table, uid_t owner);
extern void prune_cache (struct database_dyn *table, time_t now);
/* pwdcache.c */
extern void addpwbyname (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void addpwbyuid (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void readdpwbyname (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
extern void readdpwbyuid (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
/* grpcache.c */
extern void addgrbyname (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void addgrbygid (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void readdgrbyname (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
extern void readdgrbygid (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
/* hstcache.c */
extern void addhstbyname (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void addhstbyaddr (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void addhstbynamev6 (struct database_dyn *db, int fd,
request_header *req, void *key, uid_t uid);
extern void addhstbyaddrv6 (struct database_dyn *db, int fd,
request_header *req, void *key, uid_t uid);
extern void readdhstbyname (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
extern void readdhstbyaddr (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
extern void readdhstbynamev6 (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
extern void readdhstbyaddrv6 (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
/* aicache.c */
extern void addhstai (struct database_dyn *db, int fd, request_header *req,
void *key, uid_t uid);
extern void readdhstai (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
/* initgrcache.c */
extern void addinitgroups (struct database_dyn *db, int fd,
request_header *req, void *key, uid_t uid);
extern void readdinitgroups (struct database_dyn *db, struct hashentry *he,
struct datahead *dh);
/* mem.c */
extern void *mempool_alloc (struct database_dyn *db, size_t len);
extern void gc (struct database_dyn *db);
/* nscd_setup_thread.c */
extern void setup_thread (struct database_dyn *db);
/* Special version of TEMP_FAILURE_RETRY for functions returning error
values. */
#define TEMP_FAILURE_RETRY_VAL(expression) \
(__extension__ \
({ long int __result; \
do __result = (long int) (expression); \
while (__result == EINTR); \
__result; }))
#endif /* nscd.h */
|
