1 : /*
2 : +----------------------------------------------------------------------+
3 : | PHP Version 5 |
4 : +----------------------------------------------------------------------+
5 : | Copyright (c) 1997-2009 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: John Coggeshall <john@php.net> |
16 : | Wez Furlong <wez@thebrainroom.com> |
17 : +----------------------------------------------------------------------+
18 : */
19 :
20 : /* $Id: sess_sqlite.c 272374 2008-12-31 11:17:49Z sebastian $ */
21 :
22 : #include "php.h"
23 :
24 : #if HAVE_PHP_SESSION && !defined(COMPILE_DL_SESSION)
25 :
26 : #include "ext/session/php_session.h"
27 : #include "ext/standard/php_lcg.h"
28 : #include <sqlite.h>
29 : #define SQLITE_RETVAL(__r) ((__r) == SQLITE_OK ? SUCCESS : FAILURE)
30 : #define PS_SQLITE_DATA sqlite *db = (sqlite*)PS_GET_MOD_DATA()
31 : extern int sqlite_encode_binary(const unsigned char *in, int n, unsigned char *out);
32 : extern int sqlite_decode_binary(const unsigned char *in, unsigned char *out);
33 :
34 : PS_FUNCS(sqlite);
35 :
36 : ps_module ps_mod_sqlite = {
37 : PS_MOD(sqlite)
38 : };
39 :
40 : PS_OPEN_FUNC(sqlite)
41 0 : {
42 0 : char *errmsg = NULL;
43 : sqlite *db;
44 :
45 : /* TODO: do we need a safe_mode check here? */
46 0 : db = sqlite_open(save_path, 0666, &errmsg);
47 0 : if (db == NULL) {
48 0 : php_error_docref(NULL TSRMLS_CC, E_WARNING,
49 : "SQLite: failed to open/create session database `%s' - %s", save_path, errmsg);
50 0 : sqlite_freemem(errmsg);
51 0 : return FAILURE;
52 : }
53 :
54 : /* allow up to 1 minute when busy */
55 0 : sqlite_busy_timeout(db, 60000);
56 :
57 0 : sqlite_exec(db, "PRAGMA default_synchronous = OFF", NULL, NULL, NULL);
58 0 : sqlite_exec(db, "PRAGMA count_changes = OFF", NULL, NULL, NULL);
59 :
60 : /* This will fail if the table already exists, but that's not a big problem. I'm
61 : unclear as to how to check for a table's existence in SQLite -- that would be better here. */
62 0 : sqlite_exec(db,
63 : "CREATE TABLE session_data ("
64 : " sess_id PRIMARY KEY,"
65 : " value TEXT, "
66 : " updated INTEGER "
67 : ")", NULL, NULL, NULL);
68 :
69 0 : PS_SET_MOD_DATA(db);
70 :
71 0 : return SUCCESS;
72 : }
73 :
74 : PS_CLOSE_FUNC(sqlite)
75 0 : {
76 0 : PS_SQLITE_DATA;
77 :
78 0 : sqlite_close(db);
79 :
80 0 : return SUCCESS;
81 : }
82 :
83 : PS_READ_FUNC(sqlite)
84 0 : {
85 0 : PS_SQLITE_DATA;
86 : char *query;
87 : const char *tail;
88 : sqlite_vm *vm;
89 : int colcount, result;
90 : const char **rowdata, **colnames;
91 : char *error;
92 :
93 0 : *val = NULL;
94 0 : *vallen = 0;
95 :
96 0 : query = sqlite_mprintf("SELECT value FROM session_data WHERE sess_id='%q' LIMIT 1", key);
97 0 : if (query == NULL) {
98 : /* no memory */
99 0 : return FAILURE;
100 : }
101 :
102 0 : if (sqlite_compile(db, query, &tail, &vm, &error) != SQLITE_OK) {
103 0 : php_error_docref(NULL TSRMLS_CC, E_WARNING, "SQLite: Could not compile session read query: %s", error);
104 0 : sqlite_freemem(error);
105 0 : sqlite_freemem(query);
106 0 : return FAILURE;
107 : }
108 :
109 0 : switch ((result = sqlite_step(vm, &colcount, &rowdata, &colnames))) {
110 : case SQLITE_ROW:
111 0 : if (rowdata[0] != NULL) {
112 0 : *vallen = strlen(rowdata[0]);
113 0 : if (*vallen) {
114 0 : *val = emalloc(*vallen);
115 0 : *vallen = sqlite_decode_binary(rowdata[0], *val);
116 0 : (*val)[*vallen] = '\0';
117 : } else {
118 0 : *val = STR_EMPTY_ALLOC();
119 : }
120 : }
121 0 : break;
122 : default:
123 0 : sqlite_freemem(error);
124 0 : error = NULL;
125 : }
126 :
127 0 : if (SQLITE_OK != sqlite_finalize(vm, &error)) {
128 0 : php_error_docref(NULL TSRMLS_CC, E_WARNING, "SQLite: session read: error %s", error);
129 0 : sqlite_freemem(error);
130 0 : error = NULL;
131 : }
132 :
133 0 : sqlite_freemem(query);
134 :
135 0 : return *val == NULL ? FAILURE : SUCCESS;
136 : }
137 :
138 : PS_WRITE_FUNC(sqlite)
139 0 : {
140 0 : PS_SQLITE_DATA;
141 : char *error;
142 : time_t t;
143 : char *binary;
144 : int binlen;
145 : int rv;
146 :
147 0 : t = time(NULL);
148 :
149 0 : binary = safe_emalloc(1 + vallen / 254, 257, 3);
150 0 : binlen = sqlite_encode_binary((const unsigned char*)val, vallen, binary);
151 :
152 0 : rv = sqlite_exec_printf(db, "REPLACE INTO session_data VALUES('%q', '%q', %d)", NULL, NULL, &error, key, binary, t);
153 0 : if (rv != SQLITE_OK) {
154 0 : php_error_docref(NULL TSRMLS_CC, E_WARNING, "SQLite: session write query failed: %s", error);
155 0 : sqlite_freemem(error);
156 : }
157 0 : efree(binary);
158 :
159 0 : return SQLITE_RETVAL(rv);
160 : }
161 :
162 : PS_DESTROY_FUNC(sqlite)
163 0 : {
164 : int rv;
165 0 : PS_SQLITE_DATA;
166 :
167 0 : rv = sqlite_exec_printf(db, "DELETE FROM session_data WHERE sess_id='%q'", NULL, NULL, NULL, key);
168 :
169 0 : return SQLITE_RETVAL(rv);
170 : }
171 :
172 : PS_GC_FUNC(sqlite)
173 0 : {
174 0 : PS_SQLITE_DATA;
175 : int rv;
176 0 : time_t t = time(NULL);
177 :
178 0 : rv = sqlite_exec_printf(db,
179 : "DELETE FROM session_data WHERE (%d - updated) > %d",
180 : NULL, NULL, NULL, t, maxlifetime);
181 :
182 : /* because SQLite does not actually clear the deleted data from the database
183 : * we need to occassionaly do so manually to prevent the sessions database
184 : * from growing endlessly.
185 : */
186 0 : if ((int) ((float) PS(gc_divisor) * PS(gc_divisor) * php_combined_lcg(TSRMLS_C)) < PS(gc_probability)) {
187 0 : rv = sqlite_exec_printf(db, "VACUUM", NULL, NULL, NULL);
188 : }
189 0 : return SQLITE_RETVAL(rv);
190 : }
191 :
192 : #endif /* HAVE_PHP_SESSION && !defined(COMPILE_DL_SESSION) */
193 :
194 : /*
195 : * Local variables:
196 : * tab-width: 4
197 : * c-basic-offset: 4
198 : * End:
199 : * vim600: sw=4 ts=4 fdm=marker
200 : * vim<600: sw=4 ts=4
201 : */
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