5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 1997 - 2001 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
24 /* Forward declarations */
25 typedef struct SilcServerEntryStruct *SilcServerEntry;
26 typedef struct SilcClientEntryStruct *SilcClientEntry;
27 typedef struct SilcChannelEntryStruct *SilcChannelEntry;
29 /* Context for holding cache information to periodically purge
36 /* Channel key re-key context. */
39 SilcChannelEntry channel;
41 } *SilcServerChannelRekey;
43 /* Generic rekey context for connections */
45 /* Current sending encryption key, provided for re-key. The `pfs'
46 is TRUE if the Perfect Forward Secrecy is performed in re-key. */
47 unsigned char *send_enc_key;
55 Generic ID list data structure.
57 This structure is included in all ID list entries and it includes data
58 pointers that are common to all ID entries. This structure is always
59 defined to the first field in the ID entries and is used to explicitly
60 cast to this type without first explicitly casting to correct ID entry
61 type. Hence, the ID list entry is casted to this type to get this data
62 from the ID entry (which is usually opaque pointer).
64 Note that some of the fields may be NULL.
68 /* Send and receive symmetric keys */
70 SilcCipher receive_key;
73 SilcServerRekey rekey;
75 /* Hash selected in the SKE protocol, NULL if not needed at all */
82 SilcPublicKey public_key;
84 long last_receive; /* Time last received data */
85 long last_sent; /* Time last sent data */
86 bool registered; /* Boolean whether connection is registered */
87 } *SilcIDListData, SilcIDListDataStruct;
90 SILC Server entry object.
92 This entry holds information about servers in SILC network. However,
93 contents of this entry is highly dependent of what kind of server we are
94 (normal server or router server) and whether the entry is used as a local
95 list or a global list. These factors dictates the contents of this entry.
97 This entry is defined as follows:
99 Server type List type Contents
100 =======================================================================
101 server local list Server itself
102 server global list NULL
103 router local list All servers is the cell
104 router global list All servers in the SILC network
106 Following short description of the fields:
108 SilcIDListDataStruct data
110 Generic data structure to hold data common to all ID entries.
114 Logical name of the server. There is no limit of the length of the
115 server name. This is usually the same name as defined in DNS.
119 Type of the server. SILC_SERVER or SILC_ROUTER are the possible
124 ID of the server. This includes all the relevant information about
125 the server SILC will ever need. These are also the informations
126 that is broadcasted between servers and routers in the SILC network.
131 Server info (from INFO command) saved temporarily and motd (from
132 MOTD command) saved temporarily.
134 SilcServerEntry router
136 This is a pointer back to the server list. This is the router server
137 where this server is connected to. If this is the router itself and
138 it doesn't have a route this is NULL.
141 SilcCipher receive_key
143 Data sending and receiving keys.
147 A pointer, usually, to the socket list for fast referencing to
148 the data used in connection with this server. This may be anything
149 but as just said, this is usually pointer to the socket connection
153 struct SilcServerEntryStruct {
154 /* Generic data structure. DO NOT add anything before this! */
155 SilcIDListDataStruct data;
163 /* Pointer to the router */
164 SilcServerEntry router;
166 /* Connection data */
171 SILC Channel Client entry structure.
173 This entry used only by the SilcChannelEntry object and it holds
174 information about current clients (ie. users) on channel. Following
175 short description of the fields:
177 SilcClientEntry client
179 Pointer to the client list. This is the client currently on channel.
183 Client's current mode on the channel.
185 SilcChannelEntry channel
187 Back pointer back to channel. As this structure is also used by
188 SilcClientEntry we have this here for fast access to the channel when
189 used by SilcClientEntry.
191 struct SilcChannelClientEntryStruct *client_list
192 struct SilcChannelClientEntryStruct *channel_list
194 List member pointers. This structure is used by channel entry and
195 client entry thus we must have separate list member pointers for
196 them since we are using same entry for both lists (the entry is not
197 duplicated). SilcList requires this.
200 typedef struct SilcChannelClientEntryStruct {
201 SilcClientEntry client;
203 SilcChannelEntry channel;
204 struct SilcChannelClientEntryStruct *client_list;
205 struct SilcChannelClientEntryStruct *channel_list;
206 } *SilcChannelClientEntry;
209 SILC Client entry object.
211 This entry holds information about connected clients ie. users in the SILC
212 network. The contents of this entrt is depended on whether we are normal
213 server or router server and whether the list is a local or global list.
215 This entry is defined as follows:
217 Server type List type Contents
218 =======================================================================
219 server local list All clients in server
220 server global list NULL
221 router local list All clients in cell
222 router global list All clients in SILC
224 Following short description of the fields:
226 SilcIDListDataStruct data
228 Generic data structure to hold data common to all ID entries.
232 Client's usename. This is defined in the following manner:
234 Server type List type Contents
235 ====================================================
236 server local list User's name
237 router local list NULL
238 router global list NULL
240 Router doesn't hold this information since it is not vital data
241 for the router. If this information is needed by the client it is
242 fetched when it is needed.
246 Information about user. This is free information and can be virtually
247 anything. This is defined in following manner:
249 Server type List type Contents
250 ====================================================
251 server local list User's information
252 router local list NULL
253 router global list NULL
255 Router doesn't hold this information since it is not vital data
256 for the router. If this information is needed by the client it is
257 fetched when it is needed.
261 ID of the client. This includes all the information SILC will ever
262 need. Notice that no nickname of the user is saved anywhere. This is
263 beacuse of SilcClientID includes 88 bit hash value of the user's
264 nickname which can be used to track down specific user by their
265 nickname. Nickname is not relevant information that would need to be
270 Client's mode. Client maybe for example server operator or
271 router operator (SILC operator).
275 Time of last time client executed command. We are strict and will
276 not allow any command to be exeucted more than once in about
277 2 seconds. This is result of normal time().
281 Counter to check command bursts. By default, up to 5 commands
282 are allowed before limiting the execution. See command flags
285 SilcServerEntry router
287 This is a pointer to the server list. This is the router server whose
288 cell this client is coming from. This is used to route messages to
293 List of channels this client has joined.
297 A pointer, usually, to the socket list for fast referencing to
298 the data used in connection with this client. This may be anything
299 but as just said, this is usually pointer to the socket connection
303 struct SilcClientEntryStruct {
304 /* Generic data structure. DO NOT add anything before this! */
305 SilcIDListDataStruct data;
307 unsigned char *nickname;
316 /* Pointer to the router */
317 SilcServerEntry router;
319 /* List of channels client has joined to */
322 /* Connection data */
327 SILC Channel entry object.
329 This entry holds information about channels in SILC network. The contents
330 of this entry is depended on whether we are normal server or router server
331 and whether the list is a local or global list.
333 This entry is defined as follows:
335 Server type List type Contents
336 =======================================================================
337 server local list All channels in server
338 server global list NULL
339 router local list All channels in cell
340 router global list All channels in SILC
342 Following short description of the fields:
346 Logical name of the channel.
350 Current mode of the channel. See lib/silccore/silcchannel.h for
355 ID of the channel. This includes all the information SILC will ever
360 Boolean value to tell whether there are users outside this server
361 on this channel. This is set to TRUE if router sends message to
362 the server that there are users outside your server on your
363 channel as well. This way server knows that messages needs to be
364 sent to the router for further routing. If this is a normal
365 server and this channel is not created on this server this field
366 is always TRUE. If this server is a router this field is ignored.
370 Current topic of the channel.
374 Default cipher of the channel. If this is NULL then server picks
375 the cipher to be used. This can be set at SILC_COMMAND_JOIN.
379 Default hmac of the channel. If this is NULL then server picks
380 the cipher to be used. This can be set at SILC_COMMAND_JOIN.
382 SilcPublicKey founder_key
383 SilcAuthMethod founder_method
384 unsigned char *founder_passwd
385 uint32 founder_passwd_len
387 If the SILC_CMODE_FOUNDER_AUTH has been set then these will include
388 the founder's public key, authentication method and the password
389 if the method is SILC_AUTH_PASSWORD. If it is SILC_AUTH_PUBLIC_KEY
390 then the `founder_passwd' is NULL.
392 SilcServerEntry router
394 This is a pointer to the server list. This is the router server
395 whose cell this channel belongs to. This is used to route messages
398 SilcCipher channel_key
400 The key of the channel (the cipher actually).
405 Raw key data of the channel key.
407 unsigned char iv[SILC_CIPHER_MAX_IV_SIZE]
409 Current initial vector. Initial vector is received always along
410 with the channel packet. By default this is filled with NULL.
416 SilcServerChannelRekey rekey
418 Channel key re-key context.
421 struct SilcChannelEntryStruct {
430 SilcPublicKey founder_key;
431 SilcAuthMethod founder_method;
432 unsigned char *founder_passwd;
433 uint32 founder_passwd_len;
436 unsigned char *passphrase;
440 /* List of users on channel */
443 /* Pointer to the router */
444 SilcServerEntry router;
447 SilcCipher channel_key;
450 unsigned char iv[SILC_CIPHER_MAX_IV_SIZE];
453 SilcServerChannelRekey rekey;
459 As for remainder these lists are defined as follows:
461 Entry list (cache) Server type List type Contents
462 =======================================================================
463 servers server local list Server itself
464 servers server global list NULL
465 servers router local list All servers in cell
466 servers router global list All servers in SILC
468 clients server local list All clients in server
469 clients server global list NULL
470 clients router local list All clients in cell
471 clients router global list All clients in SILC
473 channels server local list All channels in server
474 channels server global list NULL
475 channels router local list All channels in cell
476 channels router global list All channels in SILC
478 As seen on the list normal server never defines a global list. This is
479 because of normal server don't know anything about anything global data,
480 they get it from the router if and when they need it. Routers, on the
481 other hand, always define local and global lists because routers really
482 know all the relevant data in the SILC network.
484 This object is used as local and global list by the server/router.
485 Above table shows how this is defined on different conditions.
487 This object holds pointers to the ID cache system. Every ID cache entry
488 has a specific context pointer to allocated entry (server, client or
492 typedef struct SilcIDListStruct {
495 SilcIDCache channels;
499 ID Entry for Unknown connections.
501 This is used during authentication phases where we still don't know
502 what kind of connection remote connection is, hence, we will use this
503 structure instead until we know what type of connection remote end is.
505 This is not in any list. This is always individually allocated and
510 /* Generic data structure. DO NOT add anything before this! */
511 SilcIDListDataStruct data;
515 void silc_idlist_add_data(void *entry, SilcIDListData idata);
516 void silc_idlist_del_data(void *entry);
517 SILC_TASK_CALLBACK_GLOBAL(silc_idlist_purge);
519 silc_idlist_add_server(SilcIDList id_list,
520 char *server_name, int server_type,
521 SilcServerID *id, SilcServerEntry router,
524 silc_idlist_find_server_by_id(SilcIDList id_list, SilcServerID *id,
525 SilcIDCacheEntry *ret_entry);
527 silc_idlist_find_server_by_name(SilcIDList id_list, char *name,
528 SilcIDCacheEntry *ret_entry);
530 silc_idlist_find_server_by_conn(SilcIDList id_list, char *hostname,
531 int port, SilcIDCacheEntry *ret_entry);
533 silc_idlist_replace_server_id(SilcIDList id_list, SilcServerID *old_id,
534 SilcServerID *new_id);
535 int silc_idlist_del_server(SilcIDList id_list, SilcServerEntry entry);
537 silc_idlist_add_client(SilcIDList id_list, unsigned char *nickname,
538 uint32 nickname_len, char *username,
539 char *userinfo, SilcClientID *id,
540 SilcServerEntry router, void *connection);
541 int silc_idlist_del_client(SilcIDList id_list, SilcClientEntry entry);
542 int silc_idlist_get_clients_by_nickname(SilcIDList id_list, char *nickname,
544 SilcClientEntry **clients,
545 uint32 *clients_count);
546 int silc_idlist_get_clients_by_hash(SilcIDList id_list, char *nickname,
548 SilcClientEntry **clients,
549 uint32 *clients_count);
551 silc_idlist_find_client_by_hash(SilcIDList id_list, char *nickname,
552 SilcHash md5hash, SilcIDCacheEntry *ret_entry);
554 silc_idlist_find_client_by_id(SilcIDList id_list, SilcClientID *id,
555 SilcIDCacheEntry *ret_entry);
557 silc_idlist_replace_client_id(SilcIDList id_list, SilcClientID *old_id,
558 SilcClientID *new_id);
559 void silc_idlist_client_destructor(SilcIDCache cache,
560 SilcIDCacheEntry entry);
562 silc_idlist_add_channel(SilcIDList id_list, char *channel_name, int mode,
563 SilcChannelID *id, SilcServerEntry router,
564 SilcCipher channel_key, SilcHmac hmac);
565 int silc_idlist_del_channel(SilcIDList id_list, SilcChannelEntry entry);
567 silc_idlist_find_channel_by_name(SilcIDList id_list, char *name,
568 SilcIDCacheEntry *ret_entry);
570 silc_idlist_find_channel_by_id(SilcIDList id_list, SilcChannelID *id,
571 SilcIDCacheEntry *ret_entry);
573 silc_idlist_replace_channel_id(SilcIDList id_list, SilcChannelID *old_id,
574 SilcChannelID *new_id);
576 silc_idlist_get_channels(SilcIDList id_list, SilcChannelID *channel_id,
577 uint32 *channels_count);