File: nscache.c

package info (click to toggle)
pavuk 0.9.35-2.1
  • links: PTS
  • area: main
  • in suites: lenny, squeeze
  • size: 4,720 kB
  • ctags: 3,824
  • sloc: ansic: 51,779; sh: 3,468; makefile: 363
file content (190 lines) | stat: -rw-r--r-- 4,459 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
/***************************************************************************/
/*    This code is part of WWW grabber called pavuk                        */
/*    Copyright (c) 1997 - 2001 Stefan Ondrejicka                          */
/*    Distributed under GPL 2 or later                                     */
/***************************************************************************/

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <time.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "config.h"

#ifdef HAVE_BDB_18x


#ifdef HAVE_DB1_H
#include <db1/db.h>
#elif defined(HAVE_DB185_H)
#include <db_185.h>
#elif defined(HAVE_DB2_DB185_H)
#include <db2/db_185.h>
#elif defined(HAVE_DB3_DB185_H)
#include <db3/db_185.h>
#elif defined(HAVE_DB4_DB185_H)
#include <db4/db_185.h>
#else
#include <db.h>
#endif

typedef int int32__t;
typedef unsigned int uint32__t;

#ifdef WORDS_BIGENDIAN
#define COPY_INT32(i1,i2) \
        ((char *)(i1))[0] = ((char *)(i2))[3];\
        ((char *)(i1))[1] = ((char *)(i2))[2];\
        ((char *)(i1))[2] = ((char *)(i2))[1];\
        ((char *)(i1))[3] = ((char *)(i2))[0];
#else
#define COPY_INT32(i1,i2)  *((int32__t *) i1) = *((int32__t *) i2);
#endif

static char *ns_cache_filename = NULL;
static DB *ns_cache_db = NULL;
static time_t ns_cache_db_modtime = 0L;

static void ns_cache_open_db(char *dirname)
{
  bool_t reopen = FALSE;
  HASHINFO hash_info = {
    4 * 1024,                   /* bucket size */
    0,                          /* fill factor */
    0,                          /* number of elements */
    96 * 1024,                  /* bytes to cache */
    0,                          /* hash function */
    0
  };                            /* byte order */
  char pom[PATH_MAX];


  LOCK_NSCACHE;
  if(dirname)
  {
    struct stat estat;

    snprintf(pom, sizeof(pom), "%s/index.db", dirname);

    if(!ns_cache_filename || strcmp(pom, ns_cache_filename))
      reopen = TRUE;

    if(!reopen && !stat(pom, &estat) && estat.st_mtime != ns_cache_db_modtime)
      reopen = TRUE;
  }
  else
  {
    _free(ns_cache_filename);
    if(ns_cache_db)
      ns_cache_db->close(ns_cache_db);
    ns_cache_db = NULL;
    ns_cache_db_modtime = 0L;
  }

  if(reopen && ns_cache_db)
  {
    _free(ns_cache_filename);
    if(ns_cache_db)
      ns_cache_db->close(ns_cache_db);
    ns_cache_db = NULL;
    ns_cache_db_modtime = 0L;
  }

  if(reopen)
  {
    struct stat estat;

    ns_cache_db = dbopen(pom, O_RDONLY, 0600, DB_HASH, &hash_info);

    if(!ns_cache_db)
    {
      xprintf(0, gettext("Unable to open Netscape cache index - %s\n"), pom);
    }

    if(!stat(pom, &estat))
      ns_cache_db_modtime = estat.st_mtime;

    _free(ns_cache_filename);
    ns_cache_filename = tl_strdup(pom);
  }
  UNLOCK_NSCACHE;
}

static void ns_cache_gen_key(DBT *key, char *urlstr)
{
  int32__t size, len;
  char *tmp;

  size = sizeof(int32__t);      /* check sum */
  size += sizeof(int32__t);     /* size of urlstr */
  size += strlen(urlstr) + 1;   /* urlstr */
  size += sizeof(int32__t);     /* post data */

  key->size = size;
  key->data = (void *) malloc(size);

  tmp = key->data;

  COPY_INT32(tmp, &size);
  tmp += sizeof(int32__t);

  len = strlen(urlstr) + 1;
  COPY_INT32(tmp, &len);
  tmp += sizeof(int32__t);

  strcpy(tmp, urlstr);
  tmp += strlen(urlstr) + 1;

  len = 0;
  COPY_INT32(tmp, &len);
  tmp += sizeof(int32__t);
}

static char *ns_cache_get_filename(DBT *data)
{
  char *tmp = data->data;

  tmp += sizeof(int32__t)       /* size */
    + sizeof(int32__t)          /* version */
    + sizeof(time_t)            /* last_modified */
    + sizeof(time_t)            /* last_accessed */
    + sizeof(time_t)            /* expires */
    + sizeof(uint32__t)         /* content_length */
    + sizeof(bool_t)            /* is_netsite */
    + sizeof(time_t)            /* lock_date */
    + sizeof(int32__t)          /* size of filename */
    ;

  return tmp;
}

char *ns_cache_find_localname(char *urlstr)
{
  DBT key, data;
  char *retv = NULL;

  ns_cache_open_db(priv_cfg.ns_cache_dir);

  LOCK_NSCACHE;
  if(ns_cache_db)
  {
    ns_cache_gen_key(&key, urlstr);

    if(!ns_cache_db->get(ns_cache_db, &key, &data, 0))
    {
      retv = tl_str_concat(NULL, cfg.ns_cache_dir, "/",
        ns_cache_get_filename(&data), NULL);
    }
    _free(key.data);
  }
  UNLOCK_NSCACHE;

  return retv;
}

#endif