GNUnet  0.11.x
gnunet-service-messenger_member.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2020--2021 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
27 
29 
32 {
33  GNUNET_assert (store);
34 
36 
37  member->store = store;
38 
39  if (id)
40  GNUNET_memcpy(&(member->id), id, sizeof(member->id));
41  else if (GNUNET_YES != generate_free_member_id(&(member->id), store->members))
42  {
43  GNUNET_free (member);
44  return NULL;
45  }
46 
48 
49  return member;
50 }
51 
52 static int
53 iterate_destroy_session (void *cls, const struct GNUNET_HashCode *key, void *value)
54 {
55  struct GNUNET_MESSENGER_MemberSession *session = value;
56  destroy_member_session(session);
57  return GNUNET_YES;
58 }
59 
60 void
62 {
63  GNUNET_assert((member) && (member->sessions));
64 
67 
68  GNUNET_free (member);
69 }
70 
71 const struct GNUNET_ShortHashCode*
72 get_member_id (const struct GNUNET_MESSENGER_Member *member)
73 {
74  GNUNET_assert (member);
75 
76  return &(member->id);
77 }
78 
79 static int
80 callback_scan_for_sessions (void *cls, const char *filename)
81 {
82  struct GNUNET_MESSENGER_Member *member = cls;
83 
85  {
86  char *directory;
87 
88  GNUNET_asprintf (&directory, "%s%c", filename, DIR_SEPARATOR);
89 
90  load_member_session(member, directory);
91  }
92 
93  return GNUNET_OK;
94 }
95 
96 void
97 load_member (struct GNUNET_MESSENGER_MemberStore *store, const char *directory)
98 {
99  GNUNET_assert ((store) && (directory));
100 
101  char *config_file;
102  GNUNET_asprintf (&config_file, "%s%s", directory, "member.cfg");
103 
104  struct GNUNET_MESSENGER_Member *member = NULL;
105 
106  if (GNUNET_YES != GNUNET_DISK_file_test (config_file))
107  goto free_config;
108 
110 
111  if (GNUNET_OK == GNUNET_CONFIGURATION_parse (cfg, config_file))
112  {
113  struct GNUNET_ShortHashCode id;
114 
115  if (GNUNET_OK != GNUNET_CONFIGURATION_get_data (cfg, "member", "id", &id, sizeof(id)))
116  goto destroy_config;
117 
118  member = add_store_member(store, &id);
119  }
120 
121 destroy_config:
122 
124 
125 free_config:
126  GNUNET_free(config_file);
127 
128  if (!member)
129  return;
130 
131  char *scan_dir;
132  GNUNET_asprintf (&scan_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
133 
136 
137  GNUNET_free(scan_dir);
138 }
139 
140 static int
141 iterate_load_next_session (void *cls, const struct GNUNET_HashCode *key, void *value)
142 {
143  const char* sessions_directory = cls;
144 
145  char* load_dir;
146  GNUNET_asprintf (&load_dir, "%s%s%c", sessions_directory, GNUNET_h2s(key), DIR_SEPARATOR);
147 
148  struct GNUNET_MESSENGER_MemberSession *session = value;
149 
151  load_member_session_next (session, load_dir);
152 
153  GNUNET_free (load_dir);
154  return GNUNET_YES;
155 }
156 
157 void
158 load_member_next_sessions (const struct GNUNET_MESSENGER_Member *member, const char *directory)
159 {
160  GNUNET_assert ((member) && (directory));
161 
162  char* load_dir;
163  GNUNET_asprintf (&load_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
164 
166 
167  GNUNET_free(load_dir);
168 }
169 
170 static int
171 iterate_save_session (void *cls, const struct GNUNET_HashCode *key, void *value)
172 {
173  const char* sessions_directory = cls;
174 
175  char* save_dir;
176  GNUNET_asprintf (&save_dir, "%s%s%c", sessions_directory, GNUNET_h2s(key), DIR_SEPARATOR);
177 
178  struct GNUNET_MESSENGER_MemberSession *session = value;
179 
180  if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
181  (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
182  save_member_session (session, save_dir);
183 
184  GNUNET_free (save_dir);
185  return GNUNET_YES;
186 }
187 
188 void
189 save_member (struct GNUNET_MESSENGER_Member *member, const char *directory)
190 {
191  GNUNET_assert ((member) && (directory));
192 
193  char *config_file;
194  GNUNET_asprintf (&config_file, "%s%s", directory, "member.cfg");
195 
197 
198  char *id_data = GNUNET_STRINGS_data_to_string_alloc (&(member->id), sizeof(member->id));
199 
200  if (id_data)
201  {
202  GNUNET_CONFIGURATION_set_value_string (cfg, "member", "id", id_data);
203 
204  GNUNET_free(id_data);
205  }
206 
207  GNUNET_CONFIGURATION_write (cfg, config_file);
209 
210  GNUNET_free(config_file);
211 
212  char* save_dir;
213  GNUNET_asprintf (&save_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
214 
215  if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
216  (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
218 
219  GNUNET_free(save_dir);
220 }
221 
222 static void
224 {
225  GNUNET_assert((session) && (next));
226 
227  if (session == next)
228  return;
229 
230  if (next->next)
231  sync_session_contact_from_next (session, next->next);
232  else
233  session->contact = next->contact;
234 }
235 
236 static int
237 iterate_sync_session_contact (void *cls, const struct GNUNET_HashCode *key, void *value)
238 {
239  struct GNUNET_MESSENGER_MemberSession *session = value;
240 
241  if (session->next)
242  sync_session_contact_from_next (session, session->next);
243 
244  return GNUNET_YES;
245 }
246 
247 void
249 {
250  GNUNET_assert ((member) && (member->sessions));
251 
253 }
254 
257 {
258  GNUNET_assert ((member) && (public_key));
259 
260  struct GNUNET_HashCode hash;
261  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
262 
263  return GNUNET_CONTAINER_multihashmap_get(member->sessions, &hash);
264 }
265 
268  const struct GNUNET_HashCode *hash;
269 
271 };
272 
273 static int
274 iterate_search_session (void *cls, const struct GNUNET_HashCode *key, void *value)
275 {
276  struct GNUNET_MESSENGER_ClosureSearchSession* search = cls;
277  struct GNUNET_MESSENGER_MemberSession *session = value;
278 
279  if (GNUNET_OK != verify_member_session_as_sender(session, search->message, search->hash))
280  return GNUNET_YES;
281 
282  search->match = session;
283  return GNUNET_NO;
284 }
285 
286 static struct GNUNET_MESSENGER_MemberSession*
288 {
289  struct GNUNET_MESSENGER_MemberSession* session = get_member_session(member, public_key);
290 
291  if (session)
292  return session;
293 
294  session = create_member_session(member, public_key);
295 
296  if (session)
297  add_member_session(member, session);
298 
299  return session;
300 }
301 
304  const struct GNUNET_HashCode *hash)
305 {
306  GNUNET_assert ((member) && (message) && (hash) &&
307  (0 == GNUNET_memcmp(&(member->id), &(message->header.sender_id))));
308 
309  if (GNUNET_MESSENGER_KIND_INFO == message->header.kind)
310  return try_member_session(member, &(message->body.info.host_key));
311  else if (GNUNET_MESSENGER_KIND_JOIN == message->header.kind)
312  return try_member_session(member, &(message->body.join.key));
313 
315 
316  search.message = message;
317  search.hash = hash;
318 
319  search.match = NULL;
321 
322  return search.match;
323 }
324 
325 void
327 {
328  if (!session)
329  return;
330 
331  GNUNET_assert((member) && (session->member == member));
332 
333  const struct GNUNET_IDENTITY_PublicKey *public_key = get_member_session_public_key(session);
334 
335  struct GNUNET_HashCode hash;
336  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
337 
339  member->sessions, &hash, session,
341  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Adding a member session failed: %s\n",
342  GNUNET_h2s(&hash));
343 }
344 
345 void
347 {
348  GNUNET_assert ((member) && (session) && (session->member == member));
349 
350  const struct GNUNET_IDENTITY_PublicKey *public_key = get_member_session_public_key(session);
351 
352  struct GNUNET_HashCode hash;
353  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
354 
355  if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove(member->sessions, &hash, session))
356  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Removing a member session failed: %s\n",
357  GNUNET_h2s(&hash));
358 }
359 
362  void *cls;
363 };
364 
365 static int
366 iterate_member_sessions_it (void *cls, const struct GNUNET_HashCode *key, void *value)
367 {
369  struct GNUNET_MESSENGER_MemberSession *session = value;
370 
371  return iterate->it (iterate->cls, get_member_session_public_key(session), session);
372 }
373 
374 int
376 {
377  GNUNET_assert ((member) && (member->sessions) && (it));
378 
380 
381  iterate.it = it;
382  iterate.cls = cls;
383 
385 }
struct GNUNET_MESSENGER_MessageHeader header
Header.
static void sync_session_contact_from_next(struct GNUNET_MESSENGER_MemberSession *session, struct GNUNET_MESSENGER_MemberSession *next)
struct GNUNET_ShortHashCode sender_id
The senders id inside of the room the message was sent in.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
void sync_member_contacts(struct GNUNET_MESSENGER_Member *member)
Synchronizes contacts between all sessions from a given member and other sessions which are linked to...
void save_member(struct GNUNET_MESSENGER_Member *member, const char *directory)
Saves data from a member into a directory which can be load to restore the member completely...
struct GNUNET_MESSENGER_MemberSession * next
struct GNUNET_CONTAINER_MultiShortmap * members
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_parse(struct GNUNET_CONFIGURATION_Handle *cfg, const char *filename)
Parse a configuration file, add all of the options in the file to the configuration environment...
void load_member_session(struct GNUNET_MESSENGER_Member *member, const char *directory)
Loads data from a directory into a new allocated and created member session of a member if the requir...
struct GNUNET_MESSENGER_MemberSession * get_member_session(const struct GNUNET_MESSENGER_Member *member, const struct GNUNET_IDENTITY_PublicKey *public_key)
Returns the member session of a member identified by a given public key.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_MESSENGER_MemberSession * create_member_session(struct GNUNET_MESSENGER_Member *member, const struct GNUNET_IDENTITY_PublicKey *pubkey)
Creates and allocates a new member session of a member with a given public key.
struct GNUNET_IDENTITY_PublicKey host_key
The senders key to verify its signatures.
static char * config_file
Set to the name of the config file used.
Definition: gnunet-arm.c:84
static int iterate_save_session(void *cls, const struct GNUNET_HashCode *key, void *value)
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
void add_member_session(struct GNUNET_MESSENGER_Member *member, struct GNUNET_MESSENGER_MemberSession *session)
Adds a given member session to its member.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
#define GNUNET_new(type)
Allocate a struct or union of the given type.
struct GNUNET_CONFIGURATION_Handle * GNUNET_CONFIGURATION_create(void)
Create a new configuration object.
int GNUNET_DISK_directory_scan(const char *dir_name, GNUNET_FileNameCallback callback, void *callback_cls)
Scan a directory for files.
Definition: disk.c:794
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_data(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, void *buf, size_t buf_size)
Get Crockford32-encoded fixed-size binary data from a configuration.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_write(struct GNUNET_CONFIGURATION_Handle *cfg, const char *filename)
Write configuration file.
int(* GNUNET_MESSENGER_MemberIteratorCallback)(void *cls, const struct GNUNET_IDENTITY_PublicKey *public_key, struct GNUNET_MESSENGER_MemberSession *session)
A 256-bit hashcode.
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.
void destroy_member(struct GNUNET_MESSENGER_Member *member)
Destroys a member and frees its memory fully.
void load_member_next_sessions(const struct GNUNET_MESSENGER_Member *member, const char *directory)
Loads data about next sessions from a directory into an empty loaded member which does not contain a ...
static int iterate_member_sessions_it(void *cls, const struct GNUNET_HashCode *key, void *value)
, &#39; bother checking if a value already exists (faster than GNUNET_CONTAINER_MULTIHASHMAPOPTION_...
struct GNUNET_IDENTITY_PublicKey key
The senders public key to verify its signatures.
static char * value
Value of the record to add/remove.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
void GNUNET_CONTAINER_multihashmap_destroy(struct GNUNET_CONTAINER_MultiHashMap *map)
Destroy a hash map.
struct GNUNET_ShortHashCode id
struct GNUNET_MESSENGER_MemberSession * match
struct GNUNET_MESSENGER_Member * create_member(struct GNUNET_MESSENGER_MemberStore *store, const struct GNUNET_ShortHashCode *id)
Creates and allocates a new member of a room with an optionally defined or random id...
GNUnet MESSENGER service.
struct GNUNET_MESSENGER_MessageBody body
Body.
void GNUNET_CONFIGURATION_destroy(struct GNUNET_CONFIGURATION_Handle *cfg)
Destroy configuration object.
int generate_free_member_id(struct GNUNET_ShortHashCode *id, const struct GNUNET_CONTAINER_MultiShortmap *members)
Tries to generate an unused member id and store it into the id parameter.
static char * filename
int GNUNET_CONTAINER_multihashmap_remove(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, const void *value)
Remove the given key-value pair from the map.
const struct GNUNET_MESSENGER_Message * message
void GNUNET_CONFIGURATION_set_value_string(struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, const char *value)
Set a configuration value that should be a string.
int iterate_member_sessions(struct GNUNET_MESSENGER_Member *member, GNUNET_MESSENGER_MemberIteratorCallback it, void *cls)
Iterate through all member sessions currently connected to a given member and call the provided itera...
enum GNUNET_GenericReturnValue GNUNET_DISK_directory_create(const char *dir)
Implementation of "mkdir -p".
Definition: disk.c:476
void load_member_session_next(struct GNUNET_MESSENGER_MemberSession *session, const char *directory)
Loads the connection from one session to another through the next attribute.
A 512-bit hashcode.
void destroy_member_session(struct GNUNET_MESSENGER_MemberSession *session)
Destroys a member session and frees its memory fully.
void save_member_session(struct GNUNET_MESSENGER_MemberSession *session, const char *directory)
Saves data from a member session into a directory which can be load to restore the member session com...
static int iterate_search_session(void *cls, const struct GNUNET_HashCode *key, void *value)
static int iterate_load_next_session(void *cls, const struct GNUNET_HashCode *key, void *value)
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
GNUNET_MESSENGER_MemberIteratorCallback it
static int iterate_sync_session_contact(void *cls, const struct GNUNET_HashCode *key, void *value)
#define DIR_SEPARATOR
Definition: platform.h:164
struct GNUNET_MESSENGER_MemberStore * store
struct GNUNET_HashCode key
The key used in the DHT.
struct GNUNET_MESSENGER_MessageInfo info
void load_member(struct GNUNET_MESSENGER_MemberStore *store, const char *directory)
Loads data from a directory into a new allocated and created member of a store if the required inform...
int 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.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
void remove_member_session(struct GNUNET_MESSENGER_Member *member, struct GNUNET_MESSENGER_MemberSession *session)
Removes a given member session from its member.
static int iterate_destroy_session(void *cls, const struct GNUNET_HashCode *key, void *value)
An identity key as per LSD0001.
configuration data
Definition: configuration.c:84
struct GNUNET_CONTAINER_MultiHashMap * sessions
#define GNUNET_log(kind,...)
static struct GNUNET_MESSENGER_MemberSession * try_member_session(struct GNUNET_MESSENGER_Member *member, const struct GNUNET_IDENTITY_PublicKey *public_key)
const struct GNUNET_IDENTITY_PublicKey * get_member_session_public_key(const struct GNUNET_MESSENGER_MemberSession *session)
Returns the public key from an EGO of a given member session.
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
int verify_member_session_as_sender(const struct GNUNET_MESSENGER_MemberSession *session, const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash)
Verifies a given member session as sender of a selected message and its hash.
struct GNUNET_MESSENGER_Member * add_store_member(struct GNUNET_MESSENGER_MemberStore *store, const struct GNUNET_ShortHashCode *id)
Adds a member to a store under a specific id and returns it on success.
char * GNUNET_STRINGS_data_to_string_alloc(const void *buf, size_t size)
Return the base32crockford encoding of the given buffer.
Definition: strings.c:937
struct GNUNET_MESSENGER_MessageJoin join
static int callback_scan_for_sessions(void *cls, const char *filename)
int GNUNET_CONTAINER_multihashmap_iterate(struct GNUNET_CONTAINER_MultiHashMap *map, GNUNET_CONTAINER_MulitHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map.
const struct GNUNET_ShortHashCode * get_member_id(const struct GNUNET_MESSENGER_Member *member)
Returns the current id of a given member.
struct GNUNET_MESSENGER_MemberSession * get_member_session_of(struct GNUNET_MESSENGER_Member *member, const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash)
Returns the member session of a member using a public key which can verify the signature of a given m...
enum GNUNET_GenericReturnValue GNUNET_DISK_directory_test(const char *fil, int is_readable)
Test if fil is a directory and listable.
Definition: disk.c:404
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:437
#define GNUNET_free(ptr)
Wrapper around free.
enum GNUNET_MESSENGER_MessageKind kind
The kind of the message.