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 {
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 {
64 
67 
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  GNUNET_free (directory);
92  }
93 
94  return GNUNET_OK;
95 }
96 
97 void
98 load_member (struct GNUNET_MESSENGER_MemberStore *store, const char *directory)
99 {
100  GNUNET_assert ((store) && (directory));
101 
102  char *config_file;
103  GNUNET_asprintf (&config_file, "%s%s", directory, "member.cfg");
104 
105  struct GNUNET_MESSENGER_Member *member = NULL;
106 
108  goto free_config;
109 
111 
113  {
114  struct GNUNET_ShortHashCode id;
115 
116  if (GNUNET_OK != GNUNET_CONFIGURATION_get_data (cfg, "member", "id", &id, sizeof(id)))
117  goto destroy_config;
118 
119  member = add_store_member(store, &id);
120  }
121 
122 destroy_config:
123 
125 
126 free_config:
128 
129  if (!member)
130  return;
131 
132  char *scan_dir;
133  GNUNET_asprintf (&scan_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
134 
137 
139 }
140 
141 static int
142 iterate_load_next_session (void *cls, const struct GNUNET_HashCode *key, void *value)
143 {
144  const char* sessions_directory = cls;
145 
146  char* load_dir;
147  GNUNET_asprintf (&load_dir, "%s%s%c", sessions_directory, GNUNET_h2s(key), DIR_SEPARATOR);
148 
149  struct GNUNET_MESSENGER_MemberSession *session = value;
150 
152  load_member_session_next (session, load_dir);
153 
154  GNUNET_free (load_dir);
155  return GNUNET_YES;
156 }
157 
158 void
159 load_member_next_sessions (const struct GNUNET_MESSENGER_Member *member, const char *directory)
160 {
161  GNUNET_assert ((member) && (directory));
162 
163  char* load_dir;
164  GNUNET_asprintf (&load_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
165 
167 
168  GNUNET_free(load_dir);
169 }
170 
171 static int
172 iterate_save_session (void *cls, const struct GNUNET_HashCode *key, void *value)
173 {
174  const char* sessions_directory = cls;
175 
176  char* save_dir;
177  GNUNET_asprintf (&save_dir, "%s%s%c", sessions_directory, GNUNET_h2s(key), DIR_SEPARATOR);
178 
179  struct GNUNET_MESSENGER_MemberSession *session = value;
180 
181  if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
182  (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
183  save_member_session (session, save_dir);
184 
185  GNUNET_free (save_dir);
186  return GNUNET_YES;
187 }
188 
189 void
190 save_member (struct GNUNET_MESSENGER_Member *member, const char *directory)
191 {
192  GNUNET_assert ((member) && (directory));
193 
194  char *config_file;
195  GNUNET_asprintf (&config_file, "%s%s", directory, "member.cfg");
196 
198 
199  char *id_data = GNUNET_STRINGS_data_to_string_alloc (&(member->id), sizeof(member->id));
200 
201  if (id_data)
202  {
203  GNUNET_CONFIGURATION_set_value_string (cfg, "member", "id", id_data);
204 
205  GNUNET_free(id_data);
206  }
207 
210 
212 
213  char* save_dir;
214  GNUNET_asprintf (&save_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
215 
216  if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
217  (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
219 
220  GNUNET_free(save_dir);
221 }
222 
223 static void
225 {
226  GNUNET_assert((session) && (next));
227 
228  if (session == next)
229  return;
230 
231  if (next->next)
232  sync_session_contact_from_next (session, next->next);
233  else
234  session->contact = next->contact;
235 }
236 
237 static int
238 iterate_sync_session_contact (void *cls, const struct GNUNET_HashCode *key, void *value)
239 {
240  struct GNUNET_MESSENGER_MemberSession *session = value;
241 
242  if (session->next)
243  sync_session_contact_from_next (session, session->next);
244 
245  return GNUNET_YES;
246 }
247 
248 void
250 {
252 
254 }
255 
258 {
260 
261  struct GNUNET_HashCode hash;
262  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
263 
264  return GNUNET_CONTAINER_multihashmap_get(member->sessions, &hash);
265 }
266 
269  const struct GNUNET_HashCode *hash;
270 
272 };
273 
274 static int
275 iterate_search_session (void *cls, const struct GNUNET_HashCode *key, void *value)
276 {
277  struct GNUNET_MESSENGER_ClosureSearchSession* search = cls;
278  struct GNUNET_MESSENGER_MemberSession *session = value;
279 
280  if (GNUNET_OK != verify_member_session_as_sender(session, search->message, search->hash))
281  return GNUNET_YES;
282 
283  search->match = session;
284  return GNUNET_NO;
285 }
286 
287 static struct GNUNET_MESSENGER_MemberSession*
289 {
291 
292  if (session)
293  return session;
294 
296 
297  if (session)
298  add_member_session(member, session);
299 
300  return session;
301 }
302 
305  const struct GNUNET_HashCode *hash)
306 {
307  GNUNET_assert ((member) && (message) && (hash) &&
308  (0 == GNUNET_memcmp(&(member->id), &(message->header.sender_id))));
309 
310  if (GNUNET_MESSENGER_KIND_INFO == message->header.kind)
311  return try_member_session(member, &(message->body.info.host_key));
312  else if (GNUNET_MESSENGER_KIND_JOIN == message->header.kind)
313  return try_member_session(member, &(message->body.join.key));
314 
316 
317  search.message = message;
318  search.hash = hash;
319 
320  search.match = NULL;
322 
323  return search.match;
324 }
325 
326 void
328 {
329  if (!session)
330  return;
331 
332  GNUNET_assert((member) && (session->member == member));
333 
334  const struct GNUNET_IDENTITY_PublicKey *public_key = get_member_session_public_key(session);
335 
336  struct GNUNET_HashCode hash;
337  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
338 
340  member->sessions, &hash, session,
342  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Adding a member session failed: %s\n",
343  GNUNET_h2s(&hash));
344 }
345 
346 void
348 {
349  GNUNET_assert ((member) && (session) && (session->member == member));
350 
351  const struct GNUNET_IDENTITY_PublicKey *public_key = get_member_session_public_key(session);
352 
353  struct GNUNET_HashCode hash;
354  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
355 
356  if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove(member->sessions, &hash, session))
357  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Removing a member session failed: %s\n",
358  GNUNET_h2s(&hash));
359 }
360 
363  void *cls;
364 };
365 
366 static int
367 iterate_member_sessions_it (void *cls, const struct GNUNET_HashCode *key, void *value)
368 {
370  struct GNUNET_MESSENGER_MemberSession *session = value;
371 
372  return iterate->it (iterate->cls, get_member_session_public_key(session), session);
373 }
374 
375 int
377 {
378  GNUNET_assert ((member) && (member->sessions) && (it));
379 
381 
382  iterate.it = it;
383  iterate.cls = cls;
384 
386 }
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
static char * config_file
Set to the name of the config file used.
Definition: gnunet-arm.c:84
static struct GNUNET_IDENTITY_Handle * id
Handle to identity service.
struct GNUNET_HashCode key
The key used in the DHT.
static char * filename
static char * value
Value of the record to add/remove.
static struct GNUNET_MESSENGER_MemberSession * try_member_session(struct GNUNET_MESSENGER_Member *member, const struct GNUNET_IDENTITY_PublicKey *public_key)
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.
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_sync_session_contact(void *cls, const struct GNUNET_HashCode *key, void *value)
static int iterate_search_session(void *cls, const struct GNUNET_HashCode *key, void *value)
static void sync_session_contact_from_next(struct GNUNET_MESSENGER_MemberSession *session, struct GNUNET_MESSENGER_MemberSession *next)
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.
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.
void destroy_member(struct GNUNET_MESSENGER_Member *member)
Destroys a member and frees its memory fully.
static int iterate_save_session(void *cls, const struct GNUNET_HashCode *key, void *value)
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 ...
void add_member_session(struct GNUNET_MESSENGER_Member *member, struct GNUNET_MESSENGER_MemberSession *session)
Adds a given member session to its member.
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...
static int callback_scan_for_sessions(void *cls, const char *filename)
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...
const struct GNUNET_ShortHashCode * get_member_id(const struct GNUNET_MESSENGER_Member *member)
Returns the current id of a given member.
static int iterate_destroy_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)
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...
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...
static int iterate_member_sessions_it(void *cls, const struct GNUNET_HashCode *key, void *value)
GNUnet MESSENGER service.
void destroy_member_session(struct GNUNET_MESSENGER_MemberSession *session)
Destroys a member session and frees its memory fully.
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.
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.
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.
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...
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...
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_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.
int(* GNUNET_MESSENGER_MemberIteratorCallback)(void *cls, const struct GNUNET_IDENTITY_PublicKey *public_key, struct GNUNET_MESSENGER_MemberSession *session)
#define GNUNET_log(kind,...)
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
@ GNUNET_OK
Definition: gnunet_common.h:95
@ GNUNET_YES
Definition: gnunet_common.h:97
@ GNUNET_NO
Definition: gnunet_common.h:94
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.
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.
struct GNUNET_CONFIGURATION_Handle * GNUNET_CONFIGURATION_create(void)
Create a new configuration object.
void GNUNET_CONFIGURATION_destroy(struct GNUNET_CONFIGURATION_Handle *cfg)
Destroy configuration object.
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.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_write(struct GNUNET_CONFIGURATION_Handle *cfg, const char *filename)
Write configuration file.
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_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_directory_create(const char *dir)
Implementation of "mkdir -p".
Definition: disk.c:496
int GNUNET_DISK_directory_scan(const char *dir_name, GNUNET_FileNameCallback callback, void *callback_cls)
Scan a directory for files.
Definition: disk.c:814
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
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.
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
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.
int GNUNET_CONTAINER_multihashmap_iterate(struct GNUNET_CONTAINER_MultiHashMap *map, GNUNET_CONTAINER_MulitHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map.
void GNUNET_CONTAINER_multihashmap_destroy(struct GNUNET_CONTAINER_MultiHashMap *map)
Destroy a hash map.
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.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST
, ' bother checking if a value already exists (faster than GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE...
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_WARNING
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_free(ptr)
Wrapper around free.
@ GNUNET_MESSENGER_KIND_INFO
The info kind.
@ GNUNET_MESSENGER_KIND_JOIN
The join kind.
char * GNUNET_STRINGS_data_to_string_alloc(const void *buf, size_t size)
Return the base32crockford encoding of the given buffer.
Definition: strings.c:750
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.
#define DIR_SEPARATOR
Definition: platform.h:164
A 512-bit hashcode.
An identity key as per LSD0001.
GNUNET_MESSENGER_MemberIteratorCallback it
const struct GNUNET_MESSENGER_Message * message
struct GNUNET_MESSENGER_MemberSession * match
struct GNUNET_MESSENGER_MemberSession * next
struct GNUNET_CONTAINER_MultiShortmap * members
struct GNUNET_CONTAINER_MultiHashMap * sessions
struct GNUNET_MESSENGER_MemberStore * store
struct GNUNET_ShortHashCode id
struct GNUNET_MESSENGER_MessageJoin join
struct GNUNET_MESSENGER_MessageInfo info
enum GNUNET_MESSENGER_MessageKind kind
The kind of the message.
struct GNUNET_ShortHashCode sender_id
The senders id inside of the room the message was sent in.
struct GNUNET_IDENTITY_PublicKey host_key
The senders key to verify its signatures.
struct GNUNET_IDENTITY_PublicKey key
The senders public key to verify its signatures.
struct GNUNET_MESSENGER_MessageHeader header
Header.
struct GNUNET_MESSENGER_MessageBody body
Body.
A 256-bit hashcode.