5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 2000 - 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.
21 /****h* silcclient/SilcClientAPI
25 * This interface defines the SILC Client Library API for the application.
26 * The client operations are defined first. These are callback functions that
27 * the application MUST implement since the library may call the functions
28 * at any time. At the end of file is the API for the application that
29 * it can use from the library. This is the only file that the application
30 * may include from the SIlC Client Library.
32 * o SILC Client Operations
34 * These functions must be implemented by the application calling the SILC
35 * client library. The client library can call these functions at any time.
37 * To use this structure: define a static SilcClientOperations variable,
38 * fill it and pass its pointer to silc_client_alloc function.
40 * o SILC Client Library API
42 * This is the API that is published by the SILC Client Library for the
43 * applications. These functions are implemented in the SILC Client Library.
44 * Application may freely call these functions from the library.
46 * Please, refer to the README file in this directory for the directions
47 * of how to use the SILC Client Library.
54 #include "clientlibincludes.h"
56 /* General definitions */
58 /****d* silcclient/SilcClientAPI/SilcKeyAgreementStatus
62 * typedef enum { ... } SilcKeyAgreementStatus;
66 * Key agreement status types indicating the status of the key
67 * agreement protocol. These types are returned to the application
68 * in the SilcKeyAgreementCallback callback function.
73 SILC_KEY_AGREEMENT_OK, /* Everything is Ok */
74 SILC_KEY_AGREEMENT_ERROR, /* Unknown error occurred */
75 SILC_KEY_AGREEMENT_FAILURE, /* The protocol failed */
76 SILC_KEY_AGREEMENT_TIMEOUT, /* The protocol timeout */
77 } SilcKeyAgreementStatus;
80 /****f* silcclient/SilcClientAPI/SilcKeyAgreementCallback
84 * typedef void (*SilcKeyAgreementCallback)(SilcClient client,
85 * SilcClientConnection conn,
86 * SilcClientEntry client_entry,
87 * SilcKeyAgreementStatus status,
88 * SilcSKEKeyMaterial *key,
93 * Key agreement callback that is called after the key agreement protocol
94 * has been performed. This is called also if error occurred during the
95 * key agreement protocol. The `key' is the allocated key material and
96 * the caller is responsible of freeing it. The `key' is NULL if error
97 * has occurred. The application can freely use the `key' to whatever
98 * purpose it needs. See lib/silcske/silcske.h for the definition of
99 * the SilcSKEKeyMaterial structure.
102 typedef void (*SilcKeyAgreementCallback)(SilcClient client,
103 SilcClientConnection conn,
104 SilcClientEntry client_entry,
105 SilcKeyAgreementStatus status,
106 SilcSKEKeyMaterial *key,
109 /****s* silcclient/SilcClientAPI/SilcPrivateMessageKeys
113 * typedef struct { ... } SilcPrivateMessageKeys;
117 * Structure to hold the list of private message keys. The array of this
118 * structure is returned by the silc_client_list_private_message_keys
124 SilcClientEntry client_entry; /* The remote client entry */
125 char *cipher; /* The cipher name */
126 unsigned char *key; /* The original key, If the appliation
127 provided it. This is NULL if the
128 library generated the key or if
129 the SKE key material was used. */
130 uint32 key_len; /* The key length */
131 } *SilcPrivateMessageKeys;
135 /****f* silcclient/SilcClientAPI/SilcAskPassphrase
139 * typedef void (*SilcAskPassphrase)(unsigned char *passphrase,
140 * uint32 passphrase_len,
145 * Ask passphrase callback. This is called by the application when the
146 * library calls `ask_passphrase' client operation. The callback delivers
147 * the passphrase to the library.
150 typedef void (*SilcAskPassphrase)(unsigned char *passphrase,
151 uint32 passphrase_len,
154 /****f* silcclient/SilcClientAPI/SilcVerifyPublicKey
158 * typedef void (*SilcVerifyPublicKey)(bool success, void *context);
162 * Public key (or certificate) verification callback. This is called
163 * by the application to indicate that the public key verification was
164 * either success or failure.
167 typedef void (*SilcVerifyPublicKey)(bool success, void *context);
169 /****f* silcclient/SilcClientAPI/SilcGetAuthMeth
173 * typedef void (*SilcGetAuthMeth)(bool success,
174 * SilcProtocolAuthMeth auth_meth,
175 * const unsigned char *auth_data,
176 * uint32 auth_data_len, void *context);
180 * Authentication method resolving callback. This is called by the
181 * application to return the resolved authentication method. The client
182 * library has called the get_auth_method client operation and given
183 * this function pointer as argument. The `success' will indicate whether
184 * the authentication method could be resolved. The `auth_meth' is the
185 * resolved authentication method. The `auth_data' and the `auth_data_len'
186 * are the resolved authentication data. The `context' is the libary's
187 * context sent to the get_auth_method client operation.
190 typedef void (*SilcGetAuthMeth)(bool success,
191 SilcProtocolAuthMeth auth_meth,
192 const unsigned char *auth_data,
193 uint32 auth_data_len, void *context);
195 /****d* silcclient/SilcClientAPI/SilcClientMessageType
199 * typedef enum { ... } SilcClientMessageType;
203 * Different message types for `say' client operation. The application
204 * may filter the message sent by the library according this type.
209 SILC_CLIENT_MESSAGE_INFO, /* Informational */
210 SILC_CLIENT_MESSAGE_WARNING, /* Warning */
211 SILC_CLIENT_MESSAGE_ERROR, /* Error */
212 SILC_CLIENT_MESSAGE_AUDIT, /* Auditable */
213 } SilcClientMessageType;
216 /****s* silcclient/SilcClientAPI/SilcClientOperations
220 * typedef struct { ... } SilcClientOperations;
224 * SILC Client Operations. These must be implemented by the application.
225 * The Client library may call any of these routines at any time. The
226 * routines are used to deliver certain information to the application
227 * or from the application to the client library.
232 /* Message sent to the application by library. `conn' associates the
233 message to a specific connection. `conn', however, may be NULL.
234 The `type' indicates the type of the message sent by the library.
235 The applicationi can for example filter the message according the
237 void (*say)(SilcClient client, SilcClientConnection conn,
238 SilcClientMessageType type, char *msg, ...);
240 /* Message for a channel. The `sender' is the sender of the message
241 The `channel' is the channel. */
242 void (*channel_message)(SilcClient client, SilcClientConnection conn,
243 SilcClientEntry sender, SilcChannelEntry channel,
244 SilcMessageFlags flags, char *msg);
246 /* Private message to the client. The `sender' is the sender of the
248 void (*private_message)(SilcClient client, SilcClientConnection conn,
249 SilcClientEntry sender, SilcMessageFlags flags,
252 /* Notify message to the client. The notify arguments are sent in the
253 same order as servers sends them. The arguments are same as received
254 from the server except for ID's. If ID is received application receives
255 the corresponding entry to the ID. For example, if Client ID is received
256 application receives SilcClientEntry. Also, if the notify type is
257 for channel the channel entry is sent to application (even if server
258 does not send it because client library gets the channel entry from
259 the Channel ID in the packet's header). */
260 void (*notify)(SilcClient client, SilcClientConnection conn,
261 SilcNotifyType type, ...);
263 /* Command handler. This function is called always in the command function.
264 If error occurs it will be called as well. `conn' is the associated
265 client connection. `cmd_context' is the command context that was
266 originally sent to the command. `success' is FALSE if error occurred
267 during command. `command' is the command being processed. It must be
268 noted that this is not reply from server. This is merely called just
269 after application has called the command. Just to tell application
270 that the command really was processed. */
271 void (*command)(SilcClient client, SilcClientConnection conn,
272 SilcClientCommandContext cmd_context, int success,
273 SilcCommand command);
275 /* Command reply handler. This function is called always in the command reply
276 function. If error occurs it will be called as well. Normal scenario
277 is that it will be called after the received command data has been parsed
278 and processed. The function is used to pass the received command data to
281 `conn' is the associated client connection. `cmd_payload' is the command
282 payload data received from server and it can be ignored. It is provided
283 if the application would like to re-parse the received command data,
284 however, it must be noted that the data is parsed already by the library
285 thus the payload can be ignored. `success' is FALSE if error occurred.
286 In this case arguments are not sent to the application. The `status' is
287 the command reply status server returned. The `command' is the command
288 reply being processed. The function has variable argument list and each
289 command defines the number and type of arguments it passes to the
290 application (on error they are not sent). */
291 void (*command_reply)(SilcClient client, SilcClientConnection conn,
292 SilcCommandPayload cmd_payload, int success,
293 SilcCommand command, SilcCommandStatus status, ...);
295 /* Called to indicate that connection was either successfully established
296 or connecting failed. This is also the first time application receives
297 the SilcClientConnection objecet which it should save somewhere.
298 If the `success' is FALSE the application must always call the function
299 silc_client_close_connection. */
300 void (*connect)(SilcClient client, SilcClientConnection conn, int success);
302 /* Called to indicate that connection was disconnected to the server. */
303 void (*disconnect)(SilcClient client, SilcClientConnection conn);
305 /* Find authentication method and authentication data by hostname and
306 port. The hostname may be IP address as well. When the authentication
307 method has been resolved the `completion' callback with the found
308 authentication method and authentication data is called. The `conn'
310 void (*get_auth_method)(SilcClient client, SilcClientConnection conn,
311 char *hostname, uint16 port,
312 SilcGetAuthMeth completion, void *context);
314 /* Verifies received public key. The `conn_type' indicates which entity
315 (server, client etc.) has sent the public key. If user decides to trust
316 the key may be saved as trusted public key for later use. The
317 `completion' must be called after the public key has been verified. */
318 void (*verify_public_key)(SilcClient client, SilcClientConnection conn,
319 SilcSocketType conn_type, unsigned char *pk,
320 uint32 pk_len, SilcSKEPKType pk_type,
321 SilcVerifyPublicKey completion, void *context);
323 /* Ask (interact, that is) a passphrase from user. The passphrase is
324 returned to the library by calling the `completion' callback with
326 void (*ask_passphrase)(SilcClient client, SilcClientConnection conn,
327 SilcAskPassphrase completion, void *context);
329 /* Notifies application that failure packet was received. This is called
330 if there is some protocol active in the client. The `protocol' is the
331 protocol context. The `failure' is opaque pointer to the failure
332 indication. Note, that the `failure' is protocol dependant and
333 application must explicitly cast it to correct type. Usually `failure'
334 is 32 bit failure type (see protocol specs for all protocol failure
336 void (*failure)(SilcClient client, SilcClientConnection conn,
337 SilcProtocol protocol, void *failure);
339 /* Asks whether the user would like to perform the key agreement protocol.
340 This is called after we have received an key agreement packet or an
341 reply to our key agreement packet. This returns TRUE if the user wants
342 the library to perform the key agreement protocol and FALSE if it is not
343 desired (application may start it later by calling the function
344 silc_client_perform_key_agreement). If TRUE is returned also the
345 `completion' and `context' arguments must be set by the application. */
346 int (*key_agreement)(SilcClient client, SilcClientConnection conn,
347 SilcClientEntry client_entry, char *hostname,
349 SilcKeyAgreementCallback *completion,
351 } SilcClientOperations;
354 /****f* silcclient/SilcClientAPI/SilcNicknameFormatParse
358 * typedef void (*SilcNicknameFormatParse)(const char *nickname,
359 * char **ret_nickname);
363 * A callback function provided by the application for the library in
364 * SilcClientParams structure. This function parses the formatted
365 * nickname string `nickname' and returns the true nickname to the
366 * `ret_nickname' pointer. The library can call this function at
370 typedef void (*SilcNicknameFormatParse)(const char *nickname,
371 char **ret_nickname);
373 /****s* silcclient/SilcClientAPI/SilcClientParams
377 * typedef struct { ... } SilcClientParams;
381 * Client parameters. This can be filled with proper values and
382 * given as argument to the silc_client_alloc function. The structure
383 * hold various parameters which affects the function of the client.
388 /* Number of maximum tasks the client library's scheduler can handle.
389 If set to zero, the default value will be used (200). For WIN32
390 systems this should be set to 64 as it is the hard limit dictated
394 /* Rekey timeout in seconds. The client will perform rekey in this
395 time interval. If set to zero, the default value will be used. */
396 unsigned int rekey_secs;
398 /* Connection authentication method request timeout. If server does not
399 reply back the current authentication method when we've requested it
400 in this time interval we'll assume the reply will not come at all.
401 If set to zero, the default value (2 seconds) will be used. */
402 unsigned int connauth_request_secs;
404 /* Nickname format string. This can be used to order the client library
405 to save the nicknames in the library in a certain format. Since
406 nicknames are not unique in SILC it is possible to have multiple same
407 nicknames. Using this format string it is possible to order the library
408 to separate the multiple same nicknames from each other. The format
409 types are defined below and they can appear in any order in the format
410 string. If this is NULL then default format is used which is the
411 default nickname without anything else. The string MUST be NULL
414 Following format types are available:
416 %n nickname - the real nickname returned by the server (mandatory)
417 %h hostname - the stripped hostname of the client
418 %H full hostname - the full hostname of the client
419 %s server name - the server name the client is connected
420 %S full server - the full server name the client is connected
421 %a number - ascending number in case there are several
422 same nicknames (fe. nick@host and nick@host2)
424 Example format strings: "%n@%h%a" (fe. nick@host, nick@host2)
425 "%a!%n@%s" (fe. nick@server, 2!nick@server)
426 "%n@%H" (fe. nick@host.domain.com)
428 By default this format is employed to the nicknames by the libary
429 only when there appears multiple same nicknames. If the library has
430 only one nickname cached the nickname is saved as is and without the
431 defined format. If you want always to save the nickname in the defined
432 format set the boolean field `nickname_force_format' to value TRUE.
434 char nickname_format[32];
436 /* If this is set to TRUE then the `nickname_format' is employed to all
437 saved nicknames even if there are no multiple same nicknames in the
438 cache. By default this is FALSE, which means that the `nickname_format'
439 is employed only if the library will receive a nickname that is
440 already saved in the cache. It is recommended to leave this to FALSE
442 bool nickname_force_format;
444 /* A callback function provided by the application for the library to
445 parse the nickname from the formatted nickname string. Even though
446 the libary formats the nicknames the application knows generally the
447 format better so this function should be provided for the library
448 if the application sets the `nickname_format' field. The library
449 will call this to get the true nickname from the provided formatted
450 nickname string whenever it needs the true nickname. */
451 SilcNicknameFormatParse nickname_parse;
457 /* Initialization functions (client.c) */
459 /****f* silcclient/SilcClientAPI/silc_client_alloc
463 * SilcClient silc_client_alloc(SilcClientOperations *ops,
464 * SilcClientParams *params,
466 * const char *silc_version);
470 * Allocates new client object. This has to be done before client may
471 * work. After calling this one must call silc_client_init to initialize
472 * the client. The `application' is application specific user data pointer
473 * and caller must free it. The `silc_version' is the application version
474 * that will be used to compare against remote host's (usually a server)
478 SilcClient silc_client_alloc(SilcClientOperations *ops,
479 SilcClientParams *params,
481 const char *silc_version);
483 /****f* silcclient/SilcClientAPI/silc_client_free
487 * void silc_client_free(SilcClient client);
491 * Frees client object and its internals. The execution of the client
492 * should be stopped with silc_client_stop function before calling
496 void silc_client_free(SilcClient client);
498 /****f* silcclient/SilcClientAPI/silc_client_init
502 * int silc_client_init(SilcClient client);
506 * Initializes the client. This makes all the necessary steps to make
507 * the client ready to be run. One must call silc_client_run to run the
508 * client. Returns FALSE if error occurred, TRUE otherwise.
511 int silc_client_init(SilcClient client);
513 /****f* silcclient/SilcClientAPI/silc_client_run
517 * void silc_client_run(SilcClient client);
521 * Runs the client. This starts the scheduler from the utility library.
522 * When this functions returns the execution of the appliation is over.
525 void silc_client_run(SilcClient client);
527 /****f* silcclient/SilcClientAPI/silc_client_stop
531 * void silc_client_stop(SilcClient client);
535 * Stops the client. This is called to stop the client and thus to stop
536 * the program. The client context must be freed with the silc_client_free
540 void silc_client_stop(SilcClient client);
543 /* Connecting functions (client.c) */
545 /****f* silcclient/SilcClientAPI/silc_client_connect_to_server
549 * int silc_client_connect_to_server(SilcClient client, int port,
550 * char *host, void *context);
554 * Connects to remote server. This is the main routine used to connect
555 * to SILC server. Returns -1 on error and the created socket otherwise.
556 * The `context' is user context that is saved into the SilcClientConnection
557 * that is created after the connection is created. Note that application
558 * may handle the connecting process outside the library. If this is the
559 * case then this function is not used at all. When the connecting is
560 * done the `connect' client operation is called.
563 int silc_client_connect_to_server(SilcClient client, int port,
564 char *host, void *context);
566 /****f* silcclient/SilcClientAPI/silc_client_add_connection
570 * SilcClientConnection silc_client_add_connection(SilcClient client,
577 * Allocates and adds new connection to the client. This adds the allocated
578 * connection to the connection table and returns a pointer to it. A client
579 * can have multiple connections to multiple servers. Every connection must
580 * be added to the client using this function. User data `context' may
581 * be sent as argument. This function is normally used only if the
582 * application performed the connecting outside the library. The library
583 * however may use this internally.
586 SilcClientConnection silc_client_add_connection(SilcClient client,
591 /****f* silcclient/SilcClientAPI/silc_client_del_connection
595 * void silc_client_del_connection(SilcClient client,
596 * SilcClientConnection conn);
600 * Removes connection from client. Frees all memory. The library
601 * call this function automatically for all connection contexts.
602 * The application however may free the connection contexts it has
606 void silc_client_del_connection(SilcClient client, SilcClientConnection conn);
608 /****f* silcclient/SilcClientAPI/silc_client_add_socket
612 * void silc_client_add_socket(SilcClient client,
613 * SilcSocketConnection sock);
617 * Adds listener socket to the listener sockets table. This function is
618 * used to add socket objects that are listeners to the client. This should
619 * not be used to add other connection objects.
622 void silc_client_add_socket(SilcClient client, SilcSocketConnection sock);
624 /****f* silcclient/SilcClientAPI/silc_client_del_socket
628 * void silc_client_del_socket(SilcClient client,
629 * SilcSocketConnection sock);
633 * Deletes listener socket from the listener sockets table. If the
634 * application has added a socket with silc_client_add_socket it must
635 * also free it using this function.
638 void silc_client_del_socket(SilcClient client, SilcSocketConnection sock);
640 /****f* silcclient/SilcClientAPI/silc_client_start_key_exchange
644 * int silc_client_start_key_exchange(SilcClient client,
645 * SilcClientConnection conn,
650 * Start SILC Key Exchange (SKE) protocol to negotiate shared secret
651 * key material between client and server. This function can be called
652 * directly if application is performing its own connecting and does not
653 * use the connecting provided by this library. This function is normally
654 * used only if the application performed the connecting outside the
655 * library. The library however may use this internally. Returns FALSE
656 * if the key exchange could not be started.
659 bool silc_client_start_key_exchange(SilcClient client,
660 SilcClientConnection conn,
663 /****f* silcclient/SilcClientAPI/silc_client_close_connection
667 * void silc_client_close_connection(SilcClient client,
668 * SilcSocketConnection sock,
669 * SilcClientConnection conn);
673 * Closes connection to remote end. Free's all allocated data except
674 * for some information such as nickname etc. that are valid at all time.
675 * If the `sock' is NULL then the conn->sock will be used. If `sock' is
676 * provided it will be checked whether the sock and `conn->sock' are the
677 * same (they can be different, ie. a socket can use `conn' as its
678 * connection but `conn->sock' might be actually a different connection
682 void silc_client_close_connection(SilcClient client,
683 SilcSocketConnection sock,
684 SilcClientConnection conn);
687 /* Message sending functions (client_channel.c and client_prvmsg.c) */
689 /****f* silcclient/SilcClientAPI/silc_client_send_channel_message
693 * void silc_client_send_channel_message(SilcClient client,
694 * SilcClientConnection conn,
695 * SilcChannelEntry channel,
696 * SilcChannelPrivateKey key,
697 * SilcMessageFlags flags,
698 * unsigned char *data,
704 * Sends packet to the `channel'. Packet to channel is always encrypted
705 * differently from "normal" packets. SILC header of the packet is
706 * encrypted with the next receiver's key and the rest of the packet is
707 * encrypted with the channel specific key. Padding and HMAC is computed
708 * with the next receiver's key. The `data' is the channel message. If
709 * the `force_send' is TRUE then the packet is sent immediately.
711 * If `key' is provided then that private key is used to encrypt the
712 * channel message. If it is not provided, private keys has not been
713 * set at all, the normal channel key is used automatically. If private
714 * keys are set then the first key (the key that was added first as
715 * private key) is used.
718 void silc_client_send_channel_message(SilcClient client,
719 SilcClientConnection conn,
720 SilcChannelEntry channel,
721 SilcChannelPrivateKey key,
722 SilcMessageFlags flags,
727 /****f* silcclient/SilcClientAPI/silc_client_send_private_message
731 * void silc_client_send_private_message(SilcClient client,
732 * SilcClientConnection conn,
733 * SilcClientEntry client_entry,
734 * SilcMessageFlags flags,
735 * unsigned char *data,
741 * Sends private message to remote client. If private message key has
742 * not been set with this client then the message will be encrypted using
743 * normal session keys. Private messages are special packets in SILC
744 * network hence we need this own function for them. This is similar
745 * to silc_client_packet_send_to_channel except that we send private
746 * message. The `data' is the private message. If the `force_send' is
747 * TRUE the packet is sent immediately.
750 void silc_client_send_private_message(SilcClient client,
751 SilcClientConnection conn,
752 SilcClientEntry client_entry,
753 SilcMessageFlags flags,
759 /* Client and Channel entry retrieval (idlist.c) */
761 /****f* silcclient/SilcClientAPI/SilcGetClientCallback
765 * typedef void (*SilcGetClientCallback)(SilcClient client,
766 * SilcClientConnection conn,
767 * SilcClientEntry *clients,
768 * uint32 clients_count,
773 * Callback function given to the silc_client_get_client function. The
774 * found entries are allocated into the `clients' array. The array must
775 * not be freed by the receiver, the library will free it later. If the
776 * `clients' is NULL, no such clients exist in the SILC Network.
779 typedef void (*SilcGetClientCallback)(SilcClient client,
780 SilcClientConnection conn,
781 SilcClientEntry *clients,
782 uint32 clients_count,
785 /****f* silcclient/SilcClientAPI/silc_client_get_clients
789 * void silc_client_get_clients(SilcClient client,
790 * SilcClientConnection conn,
791 * const char *nickname,
792 * const char *server,
793 * SilcGetClientCallback completion,
798 * Finds client entry or entries by the `nickname' and `server'. The
799 * completion callback will be called when the client entries has been
804 * NOTE: This function is always asynchronous and resolves the client
805 * information from the server. Thus, if you already know the client
806 * information then use the silc_client_get_client_by_id function to
807 * get the client entry since this function may be very slow and should
808 * be used only to initially get the client entries.
811 void silc_client_get_clients(SilcClient client,
812 SilcClientConnection conn,
813 const char *nickname,
815 SilcGetClientCallback completion,
818 /****f* silcclient/SilcClientAPI/silc_client_get_clients_local
822 * SilcClientEntry *silc_client_get_clients_local(SilcClient client,
823 * SilcClientConnection conn,
824 * const char *nickname,
825 * const char *format,
826 * uint32 *clients_count);
830 * Same as silc_client_get_clients function but does not resolve anything
831 * from the server. This checks local cache and returns all matching
832 * clients from the local cache. If none was found this returns NULL.
833 * The `nickname' is the real nickname of the client, and the `format'
834 * is the formatted nickname to find exact match from multiple found
835 * entries. The format must be same as given in the SilcClientParams
836 * structure to the client library. If the `format' is NULL all found
837 * clients by `nickname' are returned.
840 SilcClientEntry *silc_client_get_clients_local(SilcClient client,
841 SilcClientConnection conn,
842 const char *nickname,
844 uint32 *clients_count);
846 /****f* silcclient/SilcClientAPI/silc_client_get_clients_by_list
850 * void silc_client_get_clients_by_list(SilcClient client,
851 * SilcClientConnection conn,
853 * SilcBuffer client_id_list,
854 * SilcGetClientCallback completion,
859 * Gets client entries by the list of client ID's `client_id_list'. This
860 * always resolves those client ID's it does not know yet from the server
861 * so this function might take a while. The `client_id_list' is a list
862 * of ID Payloads added one after other. JOIN command reply and USERS
863 * command reply for example returns this sort of list. The `completion'
864 * will be called after the entries are available.
867 void silc_client_get_clients_by_list(SilcClient client,
868 SilcClientConnection conn,
870 SilcBuffer client_id_list,
871 SilcGetClientCallback completion,
874 /****f* silcclient/SilcClientAPI/silc_client_get_client_by_id
878 * SilcClientEntry silc_client_get_client_by_id(SilcClient client,
879 * SilcClientConnection conn,
880 * SilcClientID *client_id);
884 * Find entry for client by the client's ID. Returns the entry or NULL
885 * if the entry was not found.
888 SilcClientEntry silc_client_get_client_by_id(SilcClient client,
889 SilcClientConnection conn,
890 SilcClientID *client_id);
892 /****f* silcclient/SilcClientAPI/silc_client_get_client_by_id_resolve
897 * silc_client_get_client_by_id_resolve(SilcClient client,
898 * SilcClientConnection conn,
899 * SilcClientID *client_id,
900 * SilcGetClientCallback completion,
905 * Same as silc_client_get_client_by_id but will always resolve the
906 * information from the server. Use this only if you know that you
907 * do not have the entry and the only thing you know about the client
911 void silc_client_get_client_by_id_resolve(SilcClient client,
912 SilcClientConnection conn,
913 SilcClientID *client_id,
914 SilcGetClientCallback completion,
917 /****f* silcclient/SilcClientAPI/silc_client_del_client
921 * bool silc_client_del_client(SilcClient client, SilcClientConnection conn,
922 * SilcClientEntry client_entry)
926 * Removes client from local cache by the client entry indicated by
927 * the `client_entry'. Returns TRUE if the deletion were successful.
930 bool silc_client_del_client(SilcClient client, SilcClientConnection conn,
931 SilcClientEntry client_entry);
933 /****f* silcclient/SilcClientAPI/SilcGetChannelCallback
937 * typedef void (*SilcGetClientCallback)(SilcClient client,
938 * SilcClientConnection conn,
939 * SilcClientEntry *clients,
940 * uint32 clients_count,
945 * Callback function given to the silc_client_get_channel_* functions.
946 * The found entries are allocated into the `channels' array. The array
947 * must not be freed by the receiver, the library will free it later.
948 * If the `channel' is NULL, no such channel exist in the SILC Network.
951 typedef void (*SilcGetChannelCallback)(SilcClient client,
952 SilcClientConnection conn,
953 SilcChannelEntry *channels,
954 uint32 channels_count,
957 /****f* silcclient/SilcClientAPI/silc_client_get_channel
961 * SilcChannelEntry silc_client_get_channel(SilcClient client,
962 * SilcClientConnection conn,
967 * Finds entry for channel by the channel name. Returns the entry or NULL
968 * if the entry was not found. It is found only if the client is joined
972 SilcChannelEntry silc_client_get_channel(SilcClient client,
973 SilcClientConnection conn,
976 /****f* silcclient/SilcClientAPI/silc_client_get_channel_id_resolve
981 * silc_client_get_channel_by_id_resolve(SilcClient client,
982 * SilcClientConnection conn,
983 * SilcChannelID *channel_id,
984 * SilcGetClientCallback completion,
989 * Finds channel entry by the channel name. Returns the entry or NULL
990 * if it was not found.
993 SilcChannelEntry silc_client_get_channel_by_id(SilcClient client,
994 SilcClientConnection conn,
995 SilcChannelID *channel_id);
997 /****f* silcclient/SilcClientAPI/silc_client_get_channel_by_id_resolve
1002 * silc_client_get_channel_by_id_resolve(SilcClient client,
1003 * SilcClientConnection conn,
1004 * SilcChannelID *channel_id,
1005 * SilcGetClientCallback completion,
1010 * Resolves the channel information (its name mainly) from the server
1011 * by the `channel_id'. Use this only if you know that you do not have
1012 * the entry cached locally.
1015 void silc_client_get_channel_by_id_resolve(SilcClient client,
1016 SilcClientConnection conn,
1017 SilcChannelID *channel_id,
1018 SilcGetChannelCallback completion,
1021 /****f* silcclient/SilcClientAPI/silc_client_del_channel
1025 * bool silc_client_del_channel(SilcClient client,
1026 * SilcClientConnection conn,
1027 * SilcChannelEntry channel)
1031 * Removes channel from local cache by the channel entry indicated by
1032 * the `channel'. Returns TRUE if the deletion were successful.
1035 bool silc_client_del_channel(SilcClient client, SilcClientConnection conn,
1036 SilcChannelEntry channel);
1038 /****f* silcclient/SilcClientAPI/silc_client_get_server
1042 * SilcServerEntry silc_client_get_server(SilcClient client,
1043 * SilcClientConnection conn,
1044 * char *server_name)
1048 * Finds entry for server by the server name. Returns the entry or NULL
1049 * if the entry was not found.
1052 SilcServerEntry silc_client_get_server(SilcClient client,
1053 SilcClientConnection conn,
1056 /****f* silcclient/SilcClientAPI/silc_client_get_server_by_id
1060 * SilcServerEntry silc_client_get_server_by_id(SilcClient client,
1061 * SilcClientConnection conn,
1062 * SilcServerID *server_id);
1066 * Finds entry for server by the server ID. Returns the entry or NULL
1067 * if the entry was not found.
1070 SilcServerEntry silc_client_get_server_by_id(SilcClient client,
1071 SilcClientConnection conn,
1072 SilcServerID *server_id);
1074 /****f* silcclient/SilcClientAPI/silc_client_del_server
1078 * bool silc_client_del_server(SilcClient client, SilcClientConnection conn,
1079 * SilcServerEntry server);
1083 * Removes server from local cache by the server entry indicated by
1084 * the `server'. Returns TRUE if the deletion were successful.
1087 bool silc_client_del_server(SilcClient client, SilcClientConnection conn,
1088 SilcServerEntry server);
1090 /* Command management (command.c) */
1092 /****f* silcclient/SilcClientAPI/silc_client_command_alloc
1096 * SilcClientCommandContext silc_client_command_alloc();
1100 * Allocate Command Context. The context is defined in `command.h' file.
1101 * The context is used by the library commands and applications should use
1102 * it as well. However, application may choose to use some own context
1103 * for its local commands. All library commands, however, must use this
1107 SilcClientCommandContext silc_client_command_alloc();
1109 /****f* silcclient/SilcClientAPI/silc_client_command_free
1113 * void silc_client_command_free(SilcClientCommandContext ctx);
1117 * Free command context and its internals. If the contex was duplicated
1118 * with silc_client_command_dup this may not actually free the data,
1119 * instead it will decrease the reference counter of the context. The
1120 * context will be freed when the reference counter hits zero.
1123 void silc_client_command_free(SilcClientCommandContext ctx);
1125 /****f* silcclient/SilcClientAPI/silc_client_command_dup
1129 * SilcClientCommandContext
1130 * silc_client_command_dup(SilcClientCommandContext ctx);
1134 * Duplicate Command Context by adding reference counter. The context won't
1135 * be free'd untill it hits zero.
1138 SilcClientCommandContext silc_client_command_dup(SilcClientCommandContext ctx);
1140 /****f* silcclient/SilcClientAPI/silc_client_command_find
1144 * SilcClientCommand *silc_client_command_find(const char *name);
1148 * Finds and returns a pointer to the command list. Return NULL if the
1149 * command is not found. See the `command.[ch]' for the command list.
1152 SilcClientCommand *silc_client_command_find(const char *name);
1154 /****f* silcclient/SilcClientAPI/silc_client_send_command
1158 * void silc_client_send_command(SilcClient client,
1159 * SilcClientConnection conn,
1160 * SilcCommand command, uint16 ident,
1161 * uint32 argc, ...);
1165 * Generic function to send any command. The arguments must be sent already
1166 * encoded into correct form and in correct order.
1169 void silc_client_send_command(SilcClient client, SilcClientConnection conn,
1170 SilcCommand command, uint16 ident,
1173 /****f* silcclient/SilcClientAPI/SilcClientPendingDestructor
1177 * typedef void (*SilcClientPendingDestructor)(void *context);
1181 * Pending Command callback destructor. This is called after calling the
1182 * pending callback or if error occurs while processing the pending command.
1183 * If error occurs then the callback won't be called at all, and only this
1184 * destructor is called. The `context' is the context given for the function
1185 * silc_client_command_pending.
1188 typedef void (*SilcClientPendingDestructor)(void *context);
1190 /****f* silcclient/SilcClientAPI/silc_client_command_pending
1194 * void silc_client_command_pending(SilcClientConnection conn,
1195 * SilcCommand reply_cmd,
1197 * SilcClientPendingDestructor destructor,
1198 * SilcCommandCb callback,
1203 * Add new pending command to be executed when reply to a command has been
1204 * received. The `reply_cmd' is the command that will call the `callback'
1205 * with `context' when reply has been received. If `ident is non-zero
1206 * the `callback' will be executed when received reply with command
1207 * identifier `ident'.
1210 void silc_client_command_pending(SilcClientConnection conn,
1211 SilcCommand reply_cmd,
1213 SilcClientPendingDestructor destructor,
1214 SilcCommandCb callback,
1218 /* Private Message key management (client_prvmsg.c) */
1220 /****f* silcclient/SilcClientAPI/silc_client_add_private_message_key
1224 * int silc_client_add_private_message_key(SilcClient client,
1225 * SilcClientConnection conn,
1226 * SilcClientEntry client_entry,
1228 * unsigned char *key,
1230 * bool generate_key,
1235 * Adds private message key to the client library. The key will be used to
1236 * encrypt all private message between the client and the remote client
1237 * indicated by the `client_entry'. If the `key' is NULL and the boolean
1238 * value `generate_key' is TRUE the library will generate random key.
1239 * The `key' maybe for example pre-shared-key, passphrase or similar.
1240 * The `cipher' MAY be provided but SHOULD be NULL to assure that the
1241 * requirements of the SILC protocol are met. The API, however, allows
1242 * to allocate any cipher.
1244 * If `responder' is TRUE then the sending and receiving keys will be
1245 * set according the client being the receiver of the private key. If
1246 * FALSE the client is being the sender (or negotiator) of the private
1249 * It is not necessary to set key for normal private message usage. If the
1250 * key is not set then the private messages are encrypted using normal
1251 * session keys. Setting the private key, however, increases the security.
1253 * Returns FALSE if the key is already set for the `client_entry', TRUE
1257 int silc_client_add_private_message_key(SilcClient client,
1258 SilcClientConnection conn,
1259 SilcClientEntry client_entry,
1266 /****f* silcclient/SilcClientAPI/silc_client_add_private_message_key_ske
1270 * int silc_client_add_private_message_key_ske(SilcClient client,
1271 * SilcClientConnection conn,
1272 * SilcClientEntry client_entry,
1274 * SilcSKEKeyMaterial *key);
1278 * Same as silc_client_add_private_message_key but takes the key material
1279 * from the SKE key material structure. This structure is received if
1280 * the application uses the silc_client_send_key_agreement to negotiate
1281 * the key material. The `cipher' SHOULD be provided as it is negotiated
1282 * also in the SKE protocol.
1285 int silc_client_add_private_message_key_ske(SilcClient client,
1286 SilcClientConnection conn,
1287 SilcClientEntry client_entry,
1289 SilcSKEKeyMaterial *key,
1292 /****f* silcclient/SilcClientAPI/silc_client_send_private_message_key
1296 * int silc_client_send_private_message_key(SilcClient client,
1297 * SilcClientConnection conn,
1298 * SilcClientEntry client_entry,
1303 * Sends private message key payload to the remote client indicated by
1304 * the `client_entry'. If the `force_send' is TRUE the packet is sent
1305 * immediately. Returns FALSE if error occurs, TRUE otherwise. The
1306 * application should call this function after setting the key to the
1309 * Note that the key sent using this function is sent to the remote client
1310 * through the SILC network. The packet is protected using normal session
1314 int silc_client_send_private_message_key(SilcClient client,
1315 SilcClientConnection conn,
1316 SilcClientEntry client_entry,
1319 /****f* silcclient/SilcClientAPI/silc_client_del_private_message_key
1323 * int silc_client_del_private_message_key(SilcClient client,
1324 * SilcClientConnection conn,
1325 * SilcClientEntry client_entry);
1329 * Removes the private message from the library. The key won't be used
1330 * after this to protect the private messages with the remote `client_entry'
1331 * client. Returns FALSE on error, TRUE otherwise.
1334 int silc_client_del_private_message_key(SilcClient client,
1335 SilcClientConnection conn,
1336 SilcClientEntry client_entry);
1338 /****f* silcclient/SilcClientAPI/silc_client_list_private_message_keys
1342 * SilcPrivateMessageKeys
1343 * silc_client_list_private_message_keys(SilcClient client,
1344 * SilcClientConnection conn,
1345 * uint32 *key_count);
1349 * Returns array of set private message keys associated to the connection
1350 * `conn'. Returns allocated SilcPrivateMessageKeys array and the array
1351 * count to the `key_count' argument. The array must be freed by the caller
1352 * by calling the silc_client_free_private_message_keys function. Note:
1353 * the keys returned in the array is in raw format. It might not be desired
1354 * to show the keys as is. The application might choose not to show the keys
1355 * at all or to show the fingerprints of the keys.
1358 SilcPrivateMessageKeys
1359 silc_client_list_private_message_keys(SilcClient client,
1360 SilcClientConnection conn,
1363 /****f* silcclient/SilcClientAPI/silc_client_free_private_message_keys
1367 * void silc_client_free_private_message_keys(SilcPrivateMessageKeys keys,
1368 * uint32 key_count);
1372 * Frees the SilcPrivateMessageKeys array returned by the function
1373 * silc_client_list_private_message_keys.
1376 void silc_client_free_private_message_keys(SilcPrivateMessageKeys keys,
1380 /* Channel private key management (client_channel.c,
1381 SilcChannelPrivateKey is defined in idlist.h) */
1383 /****f* silcclient/SilcClientAPI/silc_client_add_channel_private_key
1387 * int silc_client_add_channel_private_key(SilcClient client,
1388 * SilcClientConnection conn,
1389 * SilcChannelEntry channel,
1392 * unsigned char *key,
1397 * Adds private key for channel. This may be set only if the channel's mode
1398 * mask includes the SILC_CHANNEL_MODE_PRIVKEY. This returns FALSE if the
1399 * mode is not set. When channel has private key then the messages are
1400 * encrypted using that key. All clients on the channel must also know the
1401 * key in order to decrypt the messages. However, it is possible to have
1402 * several private keys per one channel. In this case only some of the
1403 * clients on the channel may know the one key and only some the other key.
1405 * The private key for channel is optional. If it is not set then the
1406 * channel messages are encrypted using the channel key generated by the
1407 * server. However, setting the private key (or keys) for the channel
1408 * significantly adds security. If more than one key is set the library
1409 * will automatically try all keys at the message decryption phase. Note:
1410 * setting many keys slows down the decryption phase as all keys has to
1411 * be tried in order to find the correct decryption key. However, setting
1412 * a few keys does not have big impact to the decryption performace.
1416 * NOTE: This is entirely local setting. The key set using this function
1417 * is not sent to the network at any phase.
1419 * NOTE: If the key material was originated by the SKE protocol (using
1420 * silc_client_send_key_agreement) then the `key' MUST be the
1421 * key->send_enc_key as this is dictated by the SILC protocol. However,
1422 * currently it is not expected that the SKE key material would be used
1423 * as channel private key. However, this API allows it.
1426 int silc_client_add_channel_private_key(SilcClient client,
1427 SilcClientConnection conn,
1428 SilcChannelEntry channel,
1434 /****f* silcclient/SilcClientAPI/silc_client_del_channel_private_keys
1438 * int silc_client_del_channel_private_keys(SilcClient client,
1439 * SilcClientConnection conn,
1440 * SilcChannelEntry channel);
1444 * Removes all private keys from the `channel'. The old channel key is used
1445 * after calling this to protect the channel messages. Returns FALSE on
1446 * on error, TRUE otherwise.
1449 int silc_client_del_channel_private_keys(SilcClient client,
1450 SilcClientConnection conn,
1451 SilcChannelEntry channel);
1453 /****f* silcclient/SilcClientAPI/silc_client_del_channel_private_key
1457 * int silc_client_del_channel_private_key(SilcClient client,
1458 * SilcClientConnection conn,
1459 * SilcChannelEntry channel,
1460 * SilcChannelPrivateKey key);
1464 * Removes and frees private key `key' from the channel `channel'.
1465 * The `key' is retrieved by calling the function
1466 * silc_client_list_channel_private_keys. The key is not used after
1467 * this. If the key was last private key then the old channel key is
1468 * used hereafter to protect the channel messages. This returns FALSE
1469 * on error, TRUE otherwise.
1472 int silc_client_del_channel_private_key(SilcClient client,
1473 SilcClientConnection conn,
1474 SilcChannelEntry channel,
1475 SilcChannelPrivateKey key);
1477 /****f* silcclient/SilcClientAPI/silc_client_list_channel_private_keys
1481 * SilcChannelPrivateKey *
1482 * silc_client_list_channel_private_keys(SilcClient client,
1483 * SilcClientConnection conn,
1484 * SilcChannelEntry channel,
1485 * uint32 *key_count);
1489 * Returns array (pointers) of private keys associated to the `channel'.
1490 * The caller must free the array by calling the function
1491 * silc_client_free_channel_private_keys. The pointers in the array may be
1492 * used to delete the specific key by giving the pointer as argument to the
1493 * function silc_client_del_channel_private_key.
1496 SilcChannelPrivateKey *
1497 silc_client_list_channel_private_keys(SilcClient client,
1498 SilcClientConnection conn,
1499 SilcChannelEntry channel,
1502 /****f* silcclient/SilcClientAPI/silc_client_free_channel_private_keys
1506 * void silc_client_free_channel_private_keys(SilcChannelPrivateKey *keys,
1507 * uint32 key_count);
1511 * Frees the SilcChannelPrivateKey array.
1514 void silc_client_free_channel_private_keys(SilcChannelPrivateKey *keys,
1518 /* Key Agreement routines (client_keyagr.c) */
1520 /****f* silcclient/SilcClientAPI/silc_client_send_key_agreement
1524 * void silc_client_send_key_agreement(SilcClient client,
1525 * SilcClientConnection conn,
1526 * SilcClientEntry client_entry,
1529 * uint32 timeout_secs,
1530 * SilcKeyAgreementCallback completion,
1535 * Sends key agreement request to the remote client indicated by the
1536 * `client_entry'. If the caller provides the `hostname' and the `port'
1537 * arguments then the library will bind the client to that hostname and
1538 * that port for the key agreement protocol. It also sends the `hostname'
1539 * and the `port' in the key agreement packet to the remote client. This
1540 * would indicate that the remote client may initiate the key agreement
1541 * protocol to the `hostname' on the `port'. If port is zero then the
1542 * bound port is undefined (the operating system defines it).
1544 * If the `hostname' and `port' is not provided then empty key agreement
1545 * packet is sent to the remote client. The remote client may reply with
1546 * the same packet including its hostname and port. If the library receives
1547 * the reply from the remote client the `key_agreement' client operation
1548 * callback will be called to verify whether the user wants to perform the
1549 * key agreement or not.
1553 * NOTE: If the application provided the `hostname' and the `port' and the
1554 * remote side initiates the key agreement protocol it is not verified
1555 * from the user anymore whether the protocol should be executed or not.
1556 * By setting the `hostname' and `port' the user gives permission to
1557 * perform the protocol (we are responder in this case).
1559 * NOTE: If the remote side decides not to initiate the key agreement
1560 * or decides not to reply with the key agreement packet then we cannot
1561 * perform the key agreement at all. If the key agreement protocol is
1562 * performed the `completion' callback with the `context' will be called.
1563 * If remote side decides to ignore the request the `completion' will be
1564 * called after the specified timeout, `timeout_secs'.
1566 * NOTE: If the `hostname' and the `port' was not provided the `completion'
1567 * will not be called at all since this does nothing more than sending
1568 * a packet to the remote host.
1570 * NOTE: There can be only one active key agreement for one client entry.
1571 * Before setting new one, the old one must be finished (it is finished
1572 * after calling the completion callback) or the function
1573 * silc_client_abort_key_agreement must be called.
1576 void silc_client_send_key_agreement(SilcClient client,
1577 SilcClientConnection conn,
1578 SilcClientEntry client_entry,
1581 uint32 timeout_secs,
1582 SilcKeyAgreementCallback completion,
1585 /****f* silcclient/SilcClientAPI/silc_client_perform_key_agreement
1590 * silc_client_perform_key_agreement(SilcClient client,
1591 * SilcClientConnection conn,
1592 * SilcClientEntry client_entry,
1595 * SilcKeyAgreementCallback completion,
1600 * Performs the actual key agreement protocol. Application may use this
1601 * to initiate the key agreement protocol. This can be called for example
1602 * after the application has received the `key_agreement' client operation,
1603 * and did not return TRUE from it.
1605 * The `hostname' is the remote hostname (or IP address) and the `port'
1606 * is the remote port. The `completion' callback with the `context' will
1607 * be called after the key agreement protocol.
1611 * NOTE: If the application returns TRUE in the `key_agreement' client
1612 * operation the library will automatically start the key agreement. In this
1613 * case the application must not call this function. However, application
1614 * may choose to just ignore the `key_agreement' client operation (and
1615 * merely just print information about it on the screen) and call this
1616 * function when the user whishes to do so (by, for example, giving some
1617 * specific command). Thus, the API provides both, automatic and manual
1618 * initiation of the key agreement. Calling this function is the manual
1619 * initiation and returning TRUE in the `key_agreement' client operation
1620 * is the automatic initiation.
1623 void silc_client_perform_key_agreement(SilcClient client,
1624 SilcClientConnection conn,
1625 SilcClientEntry client_entry,
1628 SilcKeyAgreementCallback completion,
1631 /****f* silcclient/SilcClientAPI/silc_client_perform_key_agreement_fd
1636 * silc_client_perform_key_agreement_fd(SilcClient client,
1637 * SilcClientConnection conn,
1638 * SilcClientEntry client_entry,
1641 * SilcKeyAgreementCallback completion,
1646 * Same as above but application has created already the connection to
1647 * the remote host. The `sock' is the socket to the remote connection.
1648 * Application can use this function if it does not want the client library
1649 * to create the connection.
1652 void silc_client_perform_key_agreement_fd(SilcClient client,
1653 SilcClientConnection conn,
1654 SilcClientEntry client_entry,
1657 SilcKeyAgreementCallback completion,
1660 /****f* silcclient/SilcClientAPI/silc_client_abort_key_agreement
1664 * void silc_client_abort_key_agreement(SilcClient client,
1665 * SilcClientConnection conn,
1666 * SilcClientEntry client_entry);
1670 * This function can be called to unbind the hostname and the port for
1671 * the key agreement protocol. However, this function has effect only
1672 * before the key agreement protocol has been performed. After it has
1673 * been performed the library will automatically unbind the port. The
1674 * `client_entry' is the client to which we sent the key agreement
1678 void silc_client_abort_key_agreement(SilcClient client,
1679 SilcClientConnection conn,
1680 SilcClientEntry client_entry);
1683 /* Misc functions */
1685 /****f* silcclient/SilcClientAPI/silc_client_set_away_message
1689 * void silc_client_set_away_message(SilcClient client,
1690 * SilcClientConnection conn,
1695 * Sets away `message'. The away message may be set when the client's
1696 * mode is changed to SILC_UMODE_GONE and the client whishes to reply
1697 * to anyone who sends private message. The `message' will be sent
1698 * automatically back to the the client who send private message. If
1699 * away message is already set this replaces the old message with the
1700 * new one. If `message' is NULL the old away message is removed.
1701 * The sender may freely free the memory of the `message'.
1704 void silc_client_set_away_message(SilcClient client,
1705 SilcClientConnection conn,
1709 /****f* silcclient/SilcClientAPI/SilcConnectionAuthRequest
1713 * typedef void (*SilcConnectionAuthRequest)(SilcClient client,
1714 * SilcClientConnection conn,
1715 * SilcAuthMethod auth_meth,
1720 * Connection authentication method request callback. This is called
1721 * by the client library after it has received the authentication method
1722 * that the application requested by calling the function
1723 * silc_client_request_authentication_method.
1726 typedef void (*SilcConnectionAuthRequest)(SilcClient client,
1727 SilcClientConnection conn,
1728 SilcAuthMethod auth_meth,
1731 /****f* silcclient/SilcClientAPI/silc_client_request_authentication_method
1736 * silc_client_request_authentication_method(SilcClient client,
1737 * SilcClientConnection conn,
1738 * SilcConnectionAuthRequest
1744 * This function can be used to request the current authentication method
1745 * from the server. This may be called when connecting to the server
1746 * and the client library requests the authentication data from the
1747 * application. If the application does not know the current authentication
1748 * method it can request it from the server using this function.
1749 * The `callback' with `context' will be called after the server has
1750 * replied back with the current authentication method.
1754 silc_client_request_authentication_method(SilcClient client,
1755 SilcClientConnection conn,
1756 SilcConnectionAuthRequest callback,