1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Sascha Schumann <sascha@schumann.cx> |
16 | Marcus Boerger <helly@php.net> |
17 +----------------------------------------------------------------------+
18 */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include "php.h"
25
26 #if DBA_CDB
27 #include "php_cdb.h"
28
29 #include <sys/types.h>
30 #ifdef HAVE_UNISTD_H
31 #include <unistd.h>
32 #endif
33 #include <fcntl.h>
34
35 #if DBA_CDB_BUILTIN
36 # include "libcdb/cdb.h"
37 # include "libcdb/cdb_make.h"
38 # include "libcdb/uint32.h"
39 #else
40 # ifdef CDB_INCLUDE_FILE
41 # include CDB_INCLUDE_FILE
42 # endif
43 #endif
44
45 #define CDB_INFO \
46 dba_cdb *cdb = (dba_cdb *) info->dbf
47
48 typedef struct {
49 struct cdb c;
50 #if DBA_CDB_BUILTIN
51 struct cdb_make m;
52 php_stream *file;
53 int make;
54 #else
55 int file;
56 #endif
57 uint32 eod; /* size of constant database */
58 uint32 pos; /* current position for traversing */
59 } dba_cdb;
60
DBA_OPEN_FUNC(cdb)61 DBA_OPEN_FUNC(cdb)
62 {
63 #if DBA_CDB_BUILTIN
64 php_stream* file = 0;
65 int make;
66 #else
67 int file = 0;
68 #endif
69 dba_cdb *cdb;
70 dba_info *pinfo = (dba_info *) info;
71
72 switch (info->mode) {
73 case DBA_READER:
74 #if DBA_CDB_BUILTIN
75 make = 0;
76 file = info->fp;
77 #else
78 file = VCWD_OPEN(info->path, O_RDONLY);
79 if (file < 0) {
80 *error = "Unable to open file";
81 return FAILURE;
82 }
83 #endif
84 break;
85 #if DBA_CDB_BUILTIN
86 case DBA_TRUNC:
87 make = 1;
88 file = info->fp;
89 break;
90 case DBA_CREAT:
91 case DBA_WRITER:
92 *error = "Update operations are not supported";
93 return FAILURE; /* not supported */
94 #endif
95 default:
96 *error = "Currently not supported";
97 return FAILURE;
98 }
99
100 cdb = pemalloc(sizeof(dba_cdb), info->flags&DBA_PERSISTENT);
101 memset(cdb, 0, sizeof(dba_cdb));
102
103 #if DBA_CDB_BUILTIN
104 if (make) {
105 cdb_make_start(&cdb->m, file);
106 } else {
107 cdb_init(&cdb->c, file);
108 }
109 cdb->make = make;
110 #else
111 cdb_init(&cdb->c, file);
112 #endif
113 cdb->file = file;
114
115 pinfo->dbf = cdb;
116 return SUCCESS;
117 }
118
DBA_CLOSE_FUNC(cdb)119 DBA_CLOSE_FUNC(cdb)
120 {
121 CDB_INFO;
122
123 /* cdb_free does not close associated file */
124 #if DBA_CDB_BUILTIN
125 if (cdb->make) {
126 cdb_make_finish(&cdb->m);
127 } else {
128 cdb_free(&cdb->c);
129 }
130 #else
131 cdb_free(&cdb->c);
132 close(cdb->file);
133 #endif
134 pefree(cdb, info->flags&DBA_PERSISTENT);
135 }
136
137 #if DBA_CDB_BUILTIN
138 # define php_cdb_read(cdb, buf, len, pos) cdb_read(cdb, buf, len, pos)
139 # define php_cdb_findnext(cdb, key, len) cdb_findnext(cdb, key, len)
140 # define php_cdb_find(cdb, key, len) cdb_find(cdb, key, len)
141 #else
142 # define php_cdb_read(cdb, buf, len, pos) cdb_read(cdb, buf, len, pos)
143 # define php_cdb_findnext(cdb, key, len) cdb_findnext(cdb, key, len)
144 # define php_cdb_find(cdb, key, len) cdb_find(cdb, key, len)
145 #endif
146
DBA_FETCH_FUNC(cdb)147 DBA_FETCH_FUNC(cdb)
148 {
149 CDB_INFO;
150 unsigned int len;
151 char *new_entry = NULL;
152
153 #if DBA_CDB_BUILTIN
154 if (cdb->make)
155 return NULL; /* database was opened writeonly */
156 #endif
157 if (php_cdb_find(&cdb->c, key, keylen) == 1) {
158 while(skip--) {
159 if (php_cdb_findnext(&cdb->c, key, keylen) != 1) {
160 return NULL;
161 }
162 }
163 len = cdb_datalen(&cdb->c);
164 new_entry = safe_emalloc(len, 1, 1);
165
166 if (php_cdb_read(&cdb->c, new_entry, len, cdb_datapos(&cdb->c)) == -1) {
167 efree(new_entry);
168 return NULL;
169 }
170 new_entry[len] = 0;
171 if (newlen)
172 *newlen = len;
173 }
174
175 return new_entry;
176 }
177
DBA_UPDATE_FUNC(cdb)178 DBA_UPDATE_FUNC(cdb)
179 {
180 #if DBA_CDB_BUILTIN
181 CDB_INFO;
182
183 if (!cdb->make)
184 return FAILURE; /* database was opened readonly */
185 if (!mode)
186 return FAILURE; /* cdb_make dosn't know replace */
187 if (cdb_make_add(&cdb->m, key, keylen, val, vallen) != -1)
188 return SUCCESS;
189 #endif
190 return FAILURE;
191 }
192
DBA_EXISTS_FUNC(cdb)193 DBA_EXISTS_FUNC(cdb)
194 {
195 CDB_INFO;
196
197 #if DBA_CDB_BUILTIN
198 if (cdb->make)
199 return FAILURE; /* database was opened writeonly */
200 #endif
201 if (php_cdb_find(&cdb->c, key, keylen) == 1)
202 return SUCCESS;
203 return FAILURE;
204 }
205
DBA_DELETE_FUNC(cdb)206 DBA_DELETE_FUNC(cdb)
207 {
208 return FAILURE; /* cdb doesn't support delete */
209 }
210
211 /* {{{ cdb_file_read */
212 #if DBA_CDB_BUILTIN
213 # define cdb_file_read(fildes, buf, size) php_stream_read(fildes, buf, size)
214 #else
215 # define cdb_file_read(fildes, buf, size) read(fildes, buf, size)
216 #endif
217 /* }}} */
218
219 #define CREAD(n) do { \
220 if (cdb_file_read(cdb->file, buf, n) < n) return NULL; \
221 } while (0)
222
223 /* {{{ cdb_file_lseek
224 php_stream_seek does not return actual position */
225 #if DBA_CDB_BUILTIN
cdb_file_lseek(php_stream * fp,zend_off_t offset,int whence)226 zend_off_t cdb_file_lseek(php_stream *fp, zend_off_t offset, int whence) {
227 php_stream_seek(fp, offset, whence);
228 return php_stream_tell(fp);
229 }
230 #else
cdb_file_lseek(int fd,zend_off_t offset,int whence)231 zend_off_t cdb_file_lseek(int fd, zend_off_t offset, int whence) {
232 return lseek(fd, offset, whence);
233 }
234 #endif
235 /* }}} */
236
237 #define CSEEK(n) do { \
238 if (n >= cdb->eod) return NULL; \
239 if (cdb_file_lseek(cdb->file, (zend_off_t)n, SEEK_SET) != (zend_off_t) n) return NULL; \
240 } while (0)
241
242
DBA_FIRSTKEY_FUNC(cdb)243 DBA_FIRSTKEY_FUNC(cdb)
244 {
245 CDB_INFO;
246 uint32 klen, dlen;
247 char buf[8];
248 char *key;
249
250 #if DBA_CDB_BUILTIN
251 if (cdb->make)
252 return NULL; /* database was opened writeonly */
253 #endif
254
255 cdb->eod = -1;
256 CSEEK(0);
257 CREAD(4);
258
259 /* Total length of file in bytes */
260 uint32_unpack(buf, &cdb->eod);
261
262 CSEEK(2048);
263 CREAD(8);
264
265 /* The first four bytes contain the length of the key */
266 uint32_unpack(buf, &klen);
267 uint32_unpack(buf + 4, &dlen);
268
269 key = safe_emalloc(klen, 1, 1);
270 if (cdb_file_read(cdb->file, key, klen) < klen) {
271 efree(key);
272 key = NULL;
273 } else {
274 key[klen] = '\0';
275 if (newlen) *newlen = klen;
276 }
277
278 /* header + klenlen + dlenlen + klen + dlen */
279 cdb->pos = 2048 + 4 + 4 + klen + dlen;
280
281 return key;
282 }
283
DBA_NEXTKEY_FUNC(cdb)284 DBA_NEXTKEY_FUNC(cdb)
285 {
286 CDB_INFO;
287 uint32 klen, dlen;
288 char buf[8];
289 char *key;
290
291 #if DBA_CDB_BUILTIN
292 if (cdb->make)
293 return NULL; /* database was opened writeonly */
294 #endif
295
296 CSEEK(cdb->pos);
297 CREAD(8);
298 uint32_unpack(buf, &klen);
299 uint32_unpack(buf + 4, &dlen);
300
301 key = safe_emalloc(klen, 1, 1);
302 if (cdb_file_read(cdb->file, key, klen) < klen) {
303 efree(key);
304 key = NULL;
305 } else {
306 key[klen] = '\0';
307 if (newlen) *newlen = klen;
308 }
309
310 cdb->pos += 8 + klen + dlen;
311
312 return key;
313 }
314
DBA_OPTIMIZE_FUNC(cdb)315 DBA_OPTIMIZE_FUNC(cdb)
316 {
317 return SUCCESS;
318 }
319
DBA_SYNC_FUNC(cdb)320 DBA_SYNC_FUNC(cdb)
321 {
322 /* this is read-only */
323 return SUCCESS;
324 }
325
DBA_INFO_FUNC(cdb)326 DBA_INFO_FUNC(cdb)
327 {
328 #if DBA_CDB_BUILTIN
329 if (!strcmp(hnd->name, "cdb")) {
330 return estrdup(cdb_version());
331 } else {
332 return estrdup(cdb_make_version());
333 }
334 #else
335 return estrdup("External");
336 #endif
337 }
338
339 #endif
340
341 /*
342 * Local variables:
343 * tab-width: 4
344 * c-basic-offset: 4
345 * End:
346 * vim600: sw=4 ts=4 fdm=marker
347 * vim<600: sw=4 ts=4
348 */
349
