GNUnet  0.20.0
plugin_namecache_flat.c File Reference

flat file-based namecache backend More...

Include dependency graph for plugin_namecache_flat.c:

Go to the source code of this file.

Data Structures

struct  Plugin
 Handle for a plugin. More...
struct  FlatFileEntry


static int database_setup (struct Plugin *plugin)
 Initialize the database connections and associated data structures (create tables and indices as needed as well). More...
static int store_and_free_entries (void *cls, const struct GNUNET_HashCode *key, void *value)
 Store values in hashmap in file and free data. More...
static void database_shutdown (struct Plugin *plugin)
 Shutdown database connection and associate data structures. More...
static int expire_blocks (void *cls, const struct GNUNET_HashCode *key, void *value)
static void namecache_expire_blocks (struct Plugin *plugin)
 Removes any expired block. More...
static int namecache_cache_block (void *cls, const struct GNUNET_GNSRECORD_Block *block)
 Cache a block in the datastore. More...
static int namecache_lookup_block (void *cls, const struct GNUNET_HashCode *query, GNUNET_NAMECACHE_BlockCallback iter, void *iter_cls)
 Get the block for a particular zone and label in the datastore. More...
void * libgnunet_plugin_namecache_flat_init (void *cls)
 Entry point for the plugin. More...
void * libgnunet_plugin_namecache_flat_done (void *cls)
 Exit point from the plugin. More...

Detailed Description

flat file-based namecache backend

Martin Schanzenbach

Definition in file plugin_namecache_flat.c.

Function Documentation

◆ database_setup()

static int database_setup ( struct Plugin plugin)

Initialize the database connections and associated data structures (create tables and indices as needed as well).

pluginthe plugin context (state for this module)
GNUNET_OK on success

Definition at line 73 of file plugin_namecache_flat.c.

74 {
75  char *afsdir;
76  char*block_buffer;
77  char*buffer;
78  char*line;
79  char*query;
80  char*block;
81  uint64_t size;
82  struct FlatFileEntry *entry;
83  struct GNUNET_DISK_FileHandle *fh;
85  if (GNUNET_OK !=
87  "namecache-flat",
89  &afsdir))
90  {
92  "namecache-flat", "FILENAME");
93  return GNUNET_SYSERR;
94  }
95  if (GNUNET_OK != GNUNET_DISK_file_test (afsdir))
96  {
98  {
99  GNUNET_break (0);
100  GNUNET_free (afsdir);
101  return GNUNET_SYSERR;
102  }
103  }
104  /* afsdir should be UTF-8-encoded. If it isn't, it's a bug */
105  plugin->fn = afsdir;
107  /* Load data from file into hashmap */
109  GNUNET_NO);
110  fh = GNUNET_DISK_file_open (afsdir,
115  if (NULL == fh)
116  {
118  _ ("Unable to initialize file: %s.\n"),
119  afsdir);
120  return GNUNET_SYSERR;
121  }
123  if (GNUNET_SYSERR == GNUNET_DISK_file_size (afsdir,
124  &size,
127  {
129  _ ("Unable to get filesize: %s.\n"),
130  afsdir);
132  return GNUNET_SYSERR;
133  }
135  if (0 == size)
136  {
138  return GNUNET_OK;
139  }
141  buffer = GNUNET_malloc (size + 1);
144  buffer,
145  size))
146  {
148  _ ("Unable to read file: %s.\n"),
149  afsdir);
150  GNUNET_free (buffer);
152  return GNUNET_SYSERR;
153  }
154  buffer[size] = '\0';
157  if (0 < size)
158  {
159  line = strtok (buffer, "\n");
160  while (line != NULL)
161  {
162  query = strtok (line, ",");
163  if (NULL == query)
164  break;
165  block = strtok (NULL, ",");
166  if (NULL == block)
167  break;
168  line = strtok (NULL, "\n");
169  entry = GNUNET_malloc (sizeof(struct FlatFileEntry));
171  &entry->query));
173  strlen (block),
174  (void **) &block_buffer);
175  entry->block = (struct GNUNET_GNSRECORD_Block *) block_buffer;
176  if (GNUNET_OK !=
178  &entry->query,
179  entry,
181  {
182  GNUNET_free (entry);
183  GNUNET_break (0);
184  }
185  }
186  }
187  GNUNET_free (buffer);
188  return GNUNET_OK;
189 }
struct TestcasePlugin * plugin
The process handle to the testbed service.
static char * line
Desired phone line (string to be converted to a hash).
static struct GNUNET_DISK_FileHandle * fh
File handle to STDIN, for reading restart/quit commands.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_filename(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be the name of a file or directory.
struct GNUNET_DISK_FileHandle * GNUNET_DISK_file_open(const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
Open a file.
Definition: disk.c:1237
enum GNUNET_GenericReturnValue GNUNET_DISK_file_test(const char *fil)
Check that fil corresponds to a filename (of a file that exists and that is not a directory).
Definition: disk.c:482
enum GNUNET_GenericReturnValue GNUNET_DISK_file_size(const char *filename, uint64_t *size, int include_symbolic_links, int single_file_mode)
Get the size of the file (or directory) of the given file (in bytes).
Definition: disk.c:221
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1308
enum GNUNET_GenericReturnValue GNUNET_DISK_directory_create_for_file(const char *filename)
Create the directory structure for storing a file.
Definition: disk.c:582
ssize_t GNUNET_DISK_file_read(const struct GNUNET_DISK_FileHandle *h, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:622
Create file if it doesn't exist.
Open the file for both reading and writing.
Owner can read.
Owner can write.
#define GNUNET_CRYPTO_hash_from_string(enc, result)
Convert ASCII encoding back to struct GNUNET_HashCode
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_put(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
There must only be one value per key; storing a value should fail if a value under the same key alrea...
#define GNUNET_log(kind,...)
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
size_t GNUNET_STRINGS_base64_decode(const char *data, size_t len, void **output)
Decode from Base64.
Definition: strings.c:1695
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
struct GNUNET_GNSRECORD_Block * block
struct GNUNET_HashCode query
Handle used to access files (and pipes).

References _, FlatFileEntry::block, fh, GNUNET_assert, GNUNET_break, GNUNET_CONFIGURATION_get_value_filename(), GNUNET_CONTAINER_multihashmap_create(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_CRYPTO_hash_from_string, GNUNET_DISK_directory_create_for_file(), GNUNET_DISK_file_close(), GNUNET_DISK_file_open(), GNUNET_DISK_file_read(), GNUNET_DISK_file_size(), GNUNET_DISK_file_test(), GNUNET_DISK_OPEN_CREATE, GNUNET_DISK_OPEN_READWRITE, GNUNET_DISK_PERM_USER_READ, GNUNET_DISK_PERM_USER_WRITE, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_log_config_missing(), GNUNET_malloc, GNUNET_NO, GNUNET_OK, GNUNET_STRINGS_base64_decode(), GNUNET_SYSERR, GNUNET_YES, line, plugin, FlatFileEntry::query, and size.

Referenced by libgnunet_plugin_namecache_flat_init().

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◆ store_and_free_entries()

static int store_and_free_entries ( void *  cls,
const struct GNUNET_HashCode key,
void *  value 

Store values in hashmap in file and free data.

pluginthe plugin context

Definition at line 198 of file plugin_namecache_flat.c.

201 {
202  struct GNUNET_DISK_FileHandle *fh = cls;
203  struct FlatFileEntry *entry = value;
205  char *line;
206  char *block_b64;
207  struct GNUNET_CRYPTO_HashAsciiEncoded query;
208  size_t block_size;
210  block_size = GNUNET_GNSRECORD_block_get_size (entry->block);
211  GNUNET_STRINGS_base64_encode ((char *) entry->block,
212  block_size,
213  &block_b64);
215  &query);
217  "%s,%s\n",
218  (char *) &query,
219  block_b64);
221  GNUNET_free (block_b64);
224  line,
225  strlen (line));
227  GNUNET_free (entry->block);
228  GNUNET_free (entry);
229  GNUNET_free (line);
230  return GNUNET_YES;
231 }
static char * value
Value of the record to add/remove.
ssize_t GNUNET_DISK_file_write(const struct GNUNET_DISK_FileHandle *h, const void *buffer, size_t n)
Write a buffer to a file.
Definition: disk.c:686
size_t GNUNET_GNSRECORD_block_get_size(const struct GNUNET_GNSRECORD_Block *block)
Returns the length of this block in bytes.
void GNUNET_CRYPTO_hash_to_enc(const struct GNUNET_HashCode *block, struct GNUNET_CRYPTO_HashAsciiEncoded *result)
Convert hash to ASCII encoding.
Definition: crypto_hash.c:55
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
size_t GNUNET_STRINGS_base64_encode(const void *in, size_t len, char **output)
Encode into Base64.
Definition: strings.c:1607
0-terminated ASCII encoding of a struct GNUNET_HashCode.

References FlatFileEntry::block, fh, GNUNET_asprintf(), GNUNET_CRYPTO_hash_to_enc(), GNUNET_DISK_file_write(), GNUNET_free, GNUNET_GNSRECORD_block_get_size(), GNUNET_STRINGS_base64_encode(), GNUNET_YES, line, FlatFileEntry::query, and value.

Referenced by database_shutdown().

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◆ database_shutdown()

static void database_shutdown ( struct Plugin plugin)

Shutdown database connection and associate data structures.

pluginthe plugin context (state for this module)

Definition at line 240 of file plugin_namecache_flat.c.

241 {
242  struct GNUNET_DISK_FileHandle *fh;
250  if (NULL == fh)
251  {
253  _ ("Unable to initialize file: %s.\n"),
254  plugin->fn);
255  return;
256  }
260  fh);
263 }
Truncate file if it exists.
void GNUNET_CONTAINER_multihashmap_destroy(struct GNUNET_CONTAINER_MultiHashMap *map)
Destroy a hash map.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_iterate(struct GNUNET_CONTAINER_MultiHashMap *map, GNUNET_CONTAINER_MultiHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map.
static int store_and_free_entries(void *cls, const struct GNUNET_HashCode *key, void *value)
Store values in hashmap in file and free data.


Referenced by libgnunet_plugin_namecache_flat_done(), and libgnunet_plugin_namecache_flat_init().

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◆ expire_blocks()

static int expire_blocks ( void *  cls,
const struct GNUNET_HashCode key,
void *  value 

Definition at line 267 of file plugin_namecache_flat.c.

270 {
271  struct Plugin *plugin = cls;
272  struct FlatFileEntry *entry = value;
273  struct GNUNET_TIME_Absolute now;
276  now = GNUNET_TIME_absolute_get ();
280  expiration).rel_value_us)
281  {
283  }
284  return GNUNET_YES;
285 }
static char * expiration
Credential TTL.
Definition: gnunet-abd.c:96
struct GNUNET_HashCode key
The key used in the DHT.
struct GNUNET_TIME_Absolute GNUNET_GNSRECORD_block_get_expiration(const struct GNUNET_GNSRECORD_Block *block)
Returns the expiration of a block.
int GNUNET_CONTAINER_multihashmap_remove_all(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key)
Remove all entries for the given key from the map.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:111
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_difference(struct GNUNET_TIME_Absolute start, struct GNUNET_TIME_Absolute end)
Compute the time difference between the given start and end times.
Definition: time.c:421
Time for absolute times used by GNUnet, in microseconds.
Handle for a plugin.
Definition: block.c:38

References FlatFileEntry::block, expiration, GNUNET_CONTAINER_multihashmap_remove_all(), GNUNET_GNSRECORD_block_get_expiration(), GNUNET_TIME_absolute_get(), GNUNET_TIME_absolute_get_difference(), GNUNET_YES, key, plugin, and value.

Referenced by namecache_expire_blocks().

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◆ namecache_expire_blocks()

static void namecache_expire_blocks ( struct Plugin plugin)

Removes any expired block.

pluginthe plugin

Definition at line 294 of file plugin_namecache_flat.c.

295 {
297  &expire_blocks,
298  plugin);
299 }
static int expire_blocks(void *cls, const struct GNUNET_HashCode *key, void *value)

References expire_blocks(), GNUNET_CONTAINER_multihashmap_iterate(), and plugin.

Referenced by namecache_cache_block().

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◆ namecache_cache_block()

static int namecache_cache_block ( void *  cls,
const struct GNUNET_GNSRECORD_Block block 

Cache a block in the datastore.

clsclosure (internal context for the plugin)
blockblock to cache
GNUNET_OK on success, else GNUNET_SYSERR

Definition at line 310 of file plugin_namecache_flat.c.

312 {
313  struct Plugin *plugin = cls;
314  struct GNUNET_HashCode query;
315  struct FlatFileEntry *entry;
316  size_t block_size;
320  &query);
321  block_size = GNUNET_GNSRECORD_block_get_size (block);
322  if (block_size > 64 * 65536)
323  {
324  GNUNET_break (0);
325  return GNUNET_SYSERR;
326  }
327  entry = GNUNET_malloc (sizeof(struct FlatFileEntry));
328  entry->block = GNUNET_malloc (block_size);
329  GNUNET_memcpy (entry->block, block, block_size);
331  if (GNUNET_OK !=
333  &query,
334  entry,
336  {
337  GNUNET_free (entry);
338  GNUNET_break (0);
339  return GNUNET_SYSERR;
340  }
342  "Caching block under derived key `%s'\n",
344  return GNUNET_OK;
345 }
enum GNUNET_GenericReturnValue GNUNET_GNSRECORD_query_from_block(const struct GNUNET_GNSRECORD_Block *block, struct GNUNET_HashCode *query)
Builds the query hash from a block.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
const char * GNUNET_h2s_full(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
static void namecache_expire_blocks(struct Plugin *plugin)
Removes any expired block.
A 512-bit hashcode.

References FlatFileEntry::block, GNUNET_break, GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_multihashmap_remove_all(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_GNSRECORD_block_get_size(), GNUNET_GNSRECORD_query_from_block(), GNUNET_h2s_full(), GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_OK, GNUNET_SYSERR, namecache_expire_blocks(), plugin, and FlatFileEntry::query.

Referenced by libgnunet_plugin_namecache_flat_init().

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◆ namecache_lookup_block()

static int namecache_lookup_block ( void *  cls,
const struct GNUNET_HashCode query,
GNUNET_NAMECACHE_BlockCallback  iter,
void *  iter_cls 

Get the block for a particular zone and label in the datastore.

Will return at most one result to the iterator.

clsclosure (internal context for the plugin)
queryhash of public key derived from the zone and the label
iterfunction to call with the result
iter_clsclosure for iter
GNUNET_OK on success, GNUNET_NO if there were no results, GNUNET_SYSERR on error

Definition at line 359 of file plugin_namecache_flat.c.

362 {
363  struct Plugin *plugin = cls;
364  const struct GNUNET_GNSRECORD_Block *block;
366  block = GNUNET_CONTAINER_multihashmap_get (plugin->hm, query);
367  if (NULL == block)
368  return GNUNET_NO;
370  "Found block under derived key `%s'\n",
371  GNUNET_h2s_full (query));
372  iter (iter_cls, block);
373  return GNUNET_YES;
374 }
void * GNUNET_CONTAINER_multihashmap_get(const struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key)
Given a key find a value in the map matching the key.

References GNUNET_CONTAINER_multihashmap_get(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s_full(), GNUNET_log, GNUNET_NO, GNUNET_YES, and plugin.

Referenced by libgnunet_plugin_namecache_flat_init().

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◆ libgnunet_plugin_namecache_flat_init()

void* libgnunet_plugin_namecache_flat_init ( void *  cls)

Entry point for the plugin.

clsthe "struct GNUNET_NAMECACHE_PluginEnvironment*"
NULL on error, otherwise the plugin context

Definition at line 384 of file plugin_namecache_flat.c.

385 {
386  static struct Plugin plugin;
387  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
390  if (NULL != plugin.cfg)
391  return NULL; /* can only initialize once! */
392  memset (&plugin, 0, sizeof(struct Plugin));
393  plugin.cfg = cfg;
394  if (GNUNET_OK != database_setup (&plugin))
395  {
397  return NULL;
398  }
400  api->cls = &plugin;
404  _ ("flat plugin running\n"));
405  return api;
406 }
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static int namecache_lookup_block(void *cls, const struct GNUNET_HashCode *query, GNUNET_NAMECACHE_BlockCallback iter, void *iter_cls)
Get the block for a particular zone and label in the datastore.
static int namecache_cache_block(void *cls, const struct GNUNET_GNSRECORD_Block *block)
Cache a block in the datastore.
static void database_shutdown(struct Plugin *plugin)
Shutdown database connection and associate data structures.
static int database_setup(struct Plugin *plugin)
Initialize the database connections and associated data structures (create tables and indices as need...
struct returned by the initialization function of the plugin
int(* lookup_block)(void *cls, const struct GNUNET_HashCode *query, GNUNET_NAMECACHE_BlockCallback iter, void *iter_cls)
Get the block for a particular zone and label in the datastore.
int(* cache_block)(void *cls, const struct GNUNET_GNSRECORD_Block *block)
Cache a block in the datastore.
void * cls
Closure to pass to all plugin functions.

References _, GNUNET_NAMECACHE_PluginFunctions::cache_block, cfg, GNUNET_NAMECACHE_PluginFunctions::cls, database_setup(), database_shutdown(), GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_new, GNUNET_OK, GNUNET_NAMECACHE_PluginFunctions::lookup_block, namecache_cache_block(), namecache_lookup_block(), and plugin.

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◆ libgnunet_plugin_namecache_flat_done()

void* libgnunet_plugin_namecache_flat_done ( void *  cls)

Exit point from the plugin.

clsthe plugin context (as returned by "init")
always NULL

Definition at line 416 of file plugin_namecache_flat.c.

417 {
419  struct Plugin *plugin = api->cls;
422  plugin->cfg = NULL;
423  GNUNET_free (api);
425  "flat plugin is finished\n");
426  return NULL;
427 }
void * cls
Closure for all of the callbacks.
struct GNUNET_BLOCK_PluginFunctions * api
Plugin API.
Definition: block.c:47

References Plugin::api, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_NAMECACHE_PluginFunctions::cls, database_shutdown(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, and plugin.

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