Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1997 - 2005 Pekka Riikonen
+ Copyright (C) 1997 - 2007 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
*/
-/****h* silccore/Packet Protocol Interface
+/****h* silccore/SILC Packet Engine Interface
*
* DESCRIPTION
*
#ifndef SILCPACKET_H
#define SILCPACKET_H
-/* XXX many of these could go to silcpacket_i.h */
-
/* Maximum packet length */
#define SILC_PACKET_MAX_LEN 0xffff
#define SILC_PACKET_RESUME_ROUTER 26 /* Backup router resume */
#define SILC_PACKET_FTP 27 /* File Transfer */
#define SILC_PACKET_RESUME_CLIENT 28 /* Client resume */
+#define SILC_PACKET_ACK 29 /* Acknowledgement */
#define SILC_PACKET_PRIVATE 200 /* Private range start */
#define SILC_PACKET_MAX 255 /* RESERVED */
#define SILC_PACKET_FLAG_LIST 0x02 /* Packet is a list */
#define SILC_PACKET_FLAG_BROADCAST 0x04 /* Packet is a broadcast */
#define SILC_PACKET_FLAG_COMPRESSED 0x08 /* Payload is compressed */
+#define SILC_PACKET_FLAG_ACK 0x10 /* Acknowledge packet */
/* Impelemntation specific flags */
-#define SILC_PACKET_FLAG_LONG_PAD 0x10 /* Use maximum padding */
+#define SILC_PACKET_FLAG_LONG_PAD 0x20 /* Use maximum padding */
/***/
/****s* silccore/SilcPacketAPI/SilcPacketEngine
* IDs are available. The application must free the packet with the
* silc_packet_free function if it takes it in for processing.
*
+ * The `buffer' field contains the parsed packet payload and the start
+ * of the data area will point to the start of the packet payload.
+ *
* The list pointer `next' can be used by the application to put the
* packet context in a list during processing, if needed.
*
* from the actual stream. It can retrieve the underlaying stream from
* the packet stream by calling silc_packet_stream_get_stream function.
*
+ * You may retrieve string version of the SilcPacketError by calling
+ * silc_packet_error_string.
+ *
* SOURCE
*/
typedef enum {
SILC_PACKET_ERR_WRITE, /* Error while writing */
SILC_PACKET_ERR_MAC_FAILED, /* Packet MAC check failed */
SILC_PACKET_ERR_DECRYPTION_FAILED, /* Packet decryption failed */
+ SILC_PACKET_ERR_UNKNOWN_SID, /* Unknown SID (with IV included) */
SILC_PACKET_ERR_MALFORMED, /* Packet is malformed */
SILC_PACKET_ERR_NO_MEMORY, /* System out of memory */
} SilcPacketError;
void *callback_context,
void *stream_context);
-/****s* silccore/SilcPacketAPI/SilcPacketStream
+/****s* silccore/SilcPacketAPI/SilcPacketCallbacks
*
* NAME
*
- * typedef struct SilcPacketStreamStruct *SilcPacketStream;
+ * typedef struct { ... } *SilcPacketCallbacks;
*
* DESCRIPTION
*
***/
void silc_packet_engine_stop(SilcPacketEngine engine);
+/****f* silccore/SilcPacketAPI/silc_packet_error_string
+ *
+ * SYNOPSIS
+ *
+ * const char *silc_packet_error_string(SilcPacketError error);
+ *
+ * DESCRIPTION
+ *
+ * Return the packet error as string.
+ *
+ ***/
+const char *silc_packet_error_string(SilcPacketError error);
+
+/****f* silccore/SilcPacketAPI/silc_packet_engine_get_streams
+ *
+ * SYNOPSIS
+ *
+ * SilcDList silc_packet_engine_get_streams(SilcPacketEngine engine);
+ *
+ * DESCRIPTION
+ *
+ * Returns list of packet streams added to the packet engine. The caller
+ * must free the list with silc_packet_engine_free_streams_list.
+ *
+ * NOTES
+ *
+ * This function may also return disconnected and destroyed streams. The
+ * caller should use silc_packet_stream_is_valid to check if the stream
+ * is valid.
+ *
+ ***/
+SilcDList silc_packet_engine_get_streams(SilcPacketEngine engine);
+
+/****f* silccore/SilcPacketAPI/silc_packet_engine_free_streams_list
+ *
+ * SYNOPSIS
+ *
+ * void silc_packet_engine_free_streams_list(SilcDList streams);
+ *
+ * DESCRIPTION
+ *
+ * Free's the streams list returned by silc_packet_engine_get_streams.
+ *
+ ***/
+void silc_packet_engine_free_streams_list(SilcDList streams);
+
/****f* silccore/SilcPacketAPI/silc_packet_stream_create
*
* SYNOPSIS
* Create new packet stream and use the `stream' as underlaying stream.
* Usually the `stream' would be a socket stream, but it can be any
* stream. After this function returns, packets can immediately be
- * sent to or received from the stream.
+ * sent to and received from the stream.
*
* NOTES
*
* To read packets you will receive the packet receive callback from
* packet engine. Destroy the stream with silc_packet_stream_destroy.
*
- * If you need to send only one type of SILC packets, then it is possible
- * to create SILC Packet Streamer with silc_packet_streamer_create, which
- * can be used with silc_stream_read and silc_stream_write.
- *
* The SilcPacketStream is thread safe. Same context can be safely used
* in multi threaded environment.
*
SilcSchedule schedule,
SilcStream stream);
+/****f* silccore/SilcPacketAPI/silc_packet_stream_add_remote
+ *
+ * SYNOPSIS
+ *
+ * SilcPacketStream silc_packet_stream_add_remote(SilcPacketStream stream,
+ * const char *remote_ip,
+ * SilcUInt16 remote_port,
+ * SilcPacket packet);
+ *
+ * DESCRIPTION
+ *
+ * This function is used to add remote receivers in packet stream `stream'
+ * that has UDP/IP socket stream as the underlaying stream. This function
+ * cannot be used with other type of streams. This returns new packet
+ * stream context that can be used to send to and receive packets from
+ * the specified remote IP and remote port, or NULL on error. The `stream'
+ * is the actual stream that is used to send and receive the data.
+ *
+ * When the parent `stream' receives packets from remote IP address
+ * and port that does not have its own remote packet stream, it returns
+ * the packet to the packet callback set for `stream'. The sender's
+ * IP address and port can then be retrieved by using the
+ * silc_packet_get_sender function and to create new packet stream by
+ * calling this function. After that, all packets from that IP address
+ * and port will be received by the new packet stream.
+ *
+ * If the `packet' is non-NULL it will be injected into the new packet
+ * stream as soon as the scheduler associated with `stream' schedules
+ * new tasks. It can be used to inject an incoming packet to the stream.
+ *
+ * This interface is for connectionless UDP streams. If it is possible
+ * to create connected stream it should be done for performance reasons.
+ *
+ * EXAMPLE
+ *
+ * // Create parent packet stream, it can receive packets from anywhere
+ * listener = silc_net_udp_connect("0.0.0.0", 500, NULL, 0, schedule);
+ * parent = silc_packet_stream_create(engine, schedule, listener);
+ *
+ * ...
+ * // Received a packet to the parent stream, get the sender information.
+ * silc_packet_get_sender(packet, &ip, &port);
+ *
+ * // Create new packet stream for this remote location.
+ * remote = silc_packet_stream_add_remote(parent, ip, port, packet);
+ *
+ ***/
+SilcPacketStream silc_packet_stream_add_remote(SilcPacketStream stream,
+ const char *remote_ip,
+ SilcUInt16 remote_port,
+ SilcPacket packet);
+
/****f* silccore/SilcPacketAPI/silc_packet_stream_destroy
*
* SYNOPSIS
* DESCRIPTION
*
* Destroy packet stream and the underlaying stream. This will also
- * send end of stream to the underlaying stream.
+ * close and destroy the underlaying stream.
*
***/
void silc_packet_stream_destroy(SilcPacketStream stream);
+/****f* silccore/SilcPacketAPI/silc_packet_stream_is_valid
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_packet_stream_is_valid(SilcPacketStream stream);
+ *
+ * DESCRIPTION
+ *
+ * Returns TRUE if the packet stream indicated by `stream' is valid and
+ * has not been disconnected or destroyed.
+ *
+ ***/
+SilcBool silc_packet_stream_is_valid(SilcPacketStream stream);
+
/****f* silccore/SilcPacketAPI/silc_packet_stream_set_router
*
* SYNOPSIS
***/
void silc_packet_stream_set_router(SilcPacketStream stream);
-/****f* silccore/SilcPacketAPI/silc_packet_streamer_create
+/****f* silccore/SilcPacketAPI/silc_packet_stream_set_iv_included
*
* SYNOPSIS
*
- * SilcStream silc_packet_streamer_create(SilcPacketStream stream,
- * SilcPacketType packet_type,
- * SilcPacketFlags packet_flags);
+ * void silc_packet_stream_set_iv_included(SilcPacketStream stream);
*
* DESCRIPTION
*
- * This function can be used to create a SILC Packet Streamer that will
- * stream only one type of packet indicated by `packet_type' with packet
- * flags `packet_flags'. This is special purpose function as usually
- * multiple different types of packets need to be sent in application.
- * There are cases however when creating streamer is simpler and more
- * efficient. Cases such as file transfer stream or other data streams
- * that only send and receive one type of packet. While it would be
- * possible to use silc_packet_send function to send packets it is
- * more efficient to create the SILC Packet Streamer and use the
- * silc_stream_read and silc_stream_write functions.
- *
- * The encryption and decryption keys, and other information will be
- * retrieved from the packet stream indicated by `stream', which must be
- * created before creating the streamer.
- *
- * NOTES
+ * Sets an IV Included property for the stream indicated by `stream'.
+ * This means that the IV used in the encryption will be included in
+ * the resulted ciphertext. This makes it possible to send and receive
+ * packets on unreliable network transport protocol, such as UDP/IP.
+ * This must be called if the underlaying stream in the `stream' is UDP
+ * stream.
*
- * The packet type that is assocated with the packet stream `stream' will
- * only be available through the returned SilcStream. That packet type
- * will not be delivered to the packet callbacks. To return to the
- * normal operation destroy the streamer silc_packet_streamer_destroy.
+ * When this is set to the stream the silc_packet_set_sid must be called
+ * to set new Security ID. The Security ID will be included with the IV
+ * in the ciphertext.
*
***/
-SilcStream silc_packet_streamer_create(SilcPacketStream stream,
- SilcPacketType packet_type,
- SilcPacketFlags packet_flags);
+void silc_packet_stream_set_iv_included(SilcPacketStream stream);
-/****f* silccore/SilcPacketAPI/silc_packet_streamer_destroy
+/****f* silccore/SilcPacketAPI/silc_packet_stream_set_stream
*
* SYNOPSIS
*
- * void silc_packet_streamer_destroy(SilcStream stream);
+ * void silc_packet_stream_set_stream(SilcPacketStream packet_stream,
+ * SilcStream stream);
*
* DESCRIPTION
*
- * Destroys the created packet streamer. Use this function only for
- * stream created with silc_packet_streamer_create. The packet type
- * that was associated with the streamer can be received in the packet
- * callbacks after the streamer is destroyed.
+ * This function may be used to change the underlaying stream in the
+ * packet stream indicated by `packet_stream'. Note that the old
+ * stream will not be used after calling this function. The caller is
+ * responsible destroying the old stream. The `stream' will use
+ * the same scheduler as the `packet_stream'.
*
***/
-void silc_packet_streamer_destroy(SilcStream stream);
+void silc_packet_stream_set_stream(SilcPacketStream packet_stream,
+ SilcStream stream);
/****f* silccore/SilcPacketAPI/silc_packet_stream_get_stream
*
SilcPacketCallbacks *callbacks,
void *callback_context);
+/****f* silccore/SilcPacketAPI/SilcPacketWrapCoder
+ *
+ * SYNOPSIS
+ *
+ * typedef SilcBool (*SilcPacketWrapCoder)(SilcStream stream,
+ * SilcStreamStatus status,
+ * SilcBuffer buffer,
+ * void *context);
+ *
+ * DESCRIPTION
+ *
+ * The encoder/decoder callback for silc_packet_stream_wrap. If the
+ * `status' is SILC_STREAM_CAN_WRITE then additional data can be added
+ * to `buffer'. It is added before the data that is written with
+ * silc_stream_write. The silc_buffer_enlarge should be called to verify
+ * there is enough room in `buffer' before adding data to it. The `buffer'
+ * must not be freed.
+ *
+ * If the `status' is SILC_STREAM_CAN_READ then data from the `buffer'
+ * may be read before it is passed to readed when silc_stream_read is
+ * called. The `buffer' may be advanced also to hide data in it.
+ *
+ * This function returns FALSE in case of error.
+ *
+ ***/
+typedef SilcBool (*SilcPacketWrapCoder)(SilcStream stream,
+ SilcStreamStatus status,
+ SilcBuffer buffer,
+ void *context);
+
+/****f* silccore/SilcPacketAPI/silc_packet_stream_wrap
+ *
+ * SYNOPSIS
+ *
+ * SilcStream silc_packet_stream_wrap(SilcPacketStream stream,
+ * SilcPacketType type,
+ * SilcPacketFlags flags,
+ * SilcBool blocking_mode,
+ * SilcPacketWrapCoder coder,
+ * void *context);
+ *
+ * DESCRIPTION
+ *
+ * Wraps the packet stream indicated by `stream' into a SilcStream for
+ * the packet type indicated by `type' with packet flags indicated by
+ * `flags'. The returned SilcStream can be used to read and write the
+ * specified SILC packets with the specified packet flags, by calling
+ * silc_stream_read and silc_stream_write, respectively. The returned
+ * stream can be destroyed by calling silc_stream_destroy. It does not
+ * destroy the wrapped packet stream.
+ *
+ * If the `blocking_mode' mode is TRUE then the silc_stream_read and
+ * silc_stream_write may block the calling process or thread until SILC
+ * packet is read or written. If it is FALSE the stream is in non-blocking
+ * mode and the calls never block. The returned stream is thread-safe and
+ * packets may be read and written in multi-threaded environment.
+ *
+ * In non-blocking mode the silc_stream_set_notifier must be called before
+ * the returned stream can be used to read packets. The stream status
+ * SILC_STREAM_CAN_READ will be returned to the notifier callback to
+ * indicate that a packet is ready for reading. Calling silc_stream_read
+ * once returns one complete SILC packet data payload (which is of type of
+ * `type').
+ *
+ * The `coder' is optional encoder/decoder callback which the packet engine
+ * will call if it is non-NULL. It can be used to encode additional data
+ * into each packet when silc_stream_write is called or decode data before
+ * it is passed to reader when silc_stream_read is called. The `context'
+ * is passed to `coder'.
+ *
+ * The returned SilcStream can be used as any normal stream and all
+ * SilcStream API functions may be used with the stream. This returns
+ * NULL on error.
+ *
+ ***/
+SilcStream silc_packet_stream_wrap(SilcPacketStream stream,
+ SilcPacketType type,
+ SilcPacketFlags flags,
+ SilcBool blocking_mode,
+ SilcPacketWrapCoder coder,
+ void *context);
+
+/****f* silccore/SilcPacketAPI/silc_packet_stream_is_udp
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_packet_stream_is_udp(SilcPacketStream stream);
+ *
+ * DESCRIPTION
+ *
+ * Returns TRUE if the packet stream indicated by `stream' is using
+ * UDP transport.
+ *
+ ***/
+SilcBool silc_packet_stream_is_udp(SilcPacketStream stream);
+
+/****f* silccore/SilcPacketAPI/silc_packet_get_sender
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_packet_get_sender(SilcPacket packet,
+ * const char **sender_ip,
+ * SilcUInt16 *sender_port);
+ *
+ * DESCRIPTION
+ *
+ * Returns the packet sender's IP address and port from UDP packet
+ * indicated by `packet'. This can be called only from the packet
+ * callback to retrieve the information of the packet's sender. Returns
+ * FALSE if the information is not available.
+ *
+ ***/
+SilcBool silc_packet_get_sender(SilcPacket packet,
+ const char **sender_ip,
+ SilcUInt16 *sender_port);
+
/****f* silccore/SilcPacketAPI/silc_packet_stream_ref
*
* SYNOPSIS
***/
void *silc_packet_get_context(SilcPacketStream stream);
-/****f* silccore/SilcPacketAPI/silc_packet_set_ciphers
+/****f* silccore/SilcPacketAPI/silc_packet_set_keys
*
* SYNOPSIS
*
- * void silc_packet_set_ciphers(SilcPacketStream stream, SilcCipher send,
- * SilcCipher receive);
+ * void silc_packet_set_keys(SilcPacketStream stream, SilcCipher send_key,
+ * SilcCipher receive_key, SilcHmac send_hmac,
+ * SilcHmac receive_hmac, SilcBool rekey);
*
* DESCRIPTION
*
- * Set ciphers to be used to encrypt sent packets, and decrypt received
- * packets. This can be called multiple times to change the ciphers.
- * In this case if old cipher is set it will be freed. If ciphers are
- * not set packets will not be encrypted or decrypted.
+ * Set ciphers and HMACs to be used to encrypt sent packets, and decrypt
+ * received packets. This can be called multiple times to change the
+ * ciphers and HMACs.
+ *
+ * If the `rekey' is TRUE this function will send SILC_PACKET_REKEY_DONE
+ * to the `stream' and will set the new keys. If it is FALSE the keys
+ * are changed but the packet is not changed.
+ *
+ * When changing keys the old cipher and HMACs will be freed. If the keys
+ * are not set at all, packets will not be encrypted or decrypted.
*
***/
-void silc_packet_set_ciphers(SilcPacketStream stream, SilcCipher send,
- SilcCipher receive);
+SilcBool silc_packet_set_keys(SilcPacketStream stream, SilcCipher send_key,
+ SilcCipher receive_key, SilcHmac send_hmac,
+ SilcHmac receive_hmac, SilcBool rekey);
-/****f* silccore/SilcPacketAPI/silc_packet_get_ciphers
+/****f* silccore/SilcPacketAPI/silc_packet_get_keys
*
* SYNOPSIS
*
- * SilcBool silc_packet_get_ciphers(SilcPacketStream stream,
- * SilcCipher *send,
- * SilcCipher *receive);
+ * SilcBool silc_packet_get_keys(SilcPacketStream stream,
+ * SilcCipher *send_key,
+ * SilcCipher *receive_key,
+ * SilcHmac *send_hmac,
+ * SilcHmac *receive_hmac);
*
* DESCRIPTION
*
- * Returns the pointers of current ciphers from the `stream'. Returns
- * FALSE if ciphers are not set.
+ * Returns the pointers of current ciphers and HMACs from the `stream'.
+ * Returns FALSE if keys are not set.
*
***/
-SilcBool silc_packet_get_ciphers(SilcPacketStream stream, SilcCipher *send,
- SilcCipher *receive);
+SilcBool silc_packet_get_keys(SilcPacketStream stream,
+ SilcCipher *send_key, SilcCipher *receive_key,
+ SilcHmac *send_hmac, SilcHmac *receive_hmac);
-/****f* silccore/SilcPacketAPI/silc_packet_set_hmacs
+/****f* silccore/SilcPacketAPI/silc_packet_set_ids
*
* SYNOPSIS
*
- * void silc_packet_set_hmacs(SilcPacketStream stream, SilcHmac send,
- * SilcHmac receive);
+ * SilcBool silc_packet_set_ids(SilcPacketStream stream,
+ * SilcIdType src_id_type, const void *src_id
+ * SilcIdType dst_id_type, const void *dst_id);
*
* DESCRIPTION
*
- * Set HMACs to be used to create MACs for sent packets and to check
- * MAC for received packets. This can be called multiple times to change
- * the HMACs. In this case if old HMAC is set it will be freed. If
- * HMACs are not set MACs are not generated or verified for packets.
+ * Set the source ID and destination ID to be used when sending packets to
+ * this packet stream. The IDs to be used for a packet stream can be
+ * overridden when sending packets. However, if the IDs do not ever change
+ * for the packet stream it is recommended they are set using this function.
+ * In this case they can be omitted when sending packets to the stream.
+ * It is also possible to set only source or destination ID.
*
***/
-void silc_packet_set_hmacs(SilcPacketStream stream, SilcHmac send,
- SilcHmac receive);
+SilcBool silc_packet_set_ids(SilcPacketStream stream,
+ SilcIdType src_id_type, const void *src_id,
+ SilcIdType dst_id_type, const void *dst_id);
-/****f* silccore/SilcPacketAPI/silc_packet_get_hmacs
+/****f* silccore/SilcPacketAPI/silc_packet_get_ids
*
* SYNOPSIS
*
- * SilcBool silc_packet_get_hmacs(SilcPacketStream stream, SilcHmac *send,
- * SilcHmac *receive);
+ * SilcBool silc_packet_get_ids(SilcPacketStream stream,
+ * SilcBool *src_id_set, SilcID *src_id,
+ * SilcBool *dst_id_set, SilcID *dst_id);
*
* DESCRIPTION
*
- * Returns the pointers of current HMACs from the `stream'. Returns
- * FALSE if HMACs are not set.
+ * Returns source and destination IDs from the packet stream. The
+ * `src_id_set' is set to TRUE if the source ID was returned. The
+ * `dst_id_set' is set to TRUE if the destination ID was returned.
*
***/
-SilcBool silc_packet_get_hmacs(SilcPacketStream stream, SilcHmac *send,
- SilcHmac *receive);
+SilcBool silc_packet_get_ids(SilcPacketStream stream,
+ SilcBool *src_id_set, SilcID *src_id,
+ SilcBool *dst_id_set, SilcID *dst_id);
-/****f* silccore/SilcPacketAPI/silc_packet_set_ids
+/****f* silccore/SilcPacketAPI/silc_packet_set_sid
*
* SYNOPSIS
*
- * SilcBool silc_packet_set_ids(SilcPacketStream stream,
- * SilcIdType src_id_type, const void *src_id
- * SilcIdType dst_id_type, const void *dst_id);
+ * SilcBool silc_packet_set_sid(SilcPacketStream stream, SilcUInt8 sid);
*
* DESCRIPTION
*
- * Set the source ID and destinaion ID to be used when sending packets to
- * this packet stream. The IDs to be used for a packet stream can be
- * overridden when sending packets. However, if the IDs do not ever change
- * for the packet stream it is recommended they are set using this function.
- * In this case they can be omitted when sending packets to the stream.
- * It is also possible to set only source or destination ID.
+ * Sets new Security ID to the packet stream indicated by `stream'. This
+ * is called only if the IV Included property was set to the stream
+ * by calling silc_packet_stream_set_iv_included. This function sets
+ * new Security ID to the stream which is then included in the ciphertext
+ * of a packet. The `sid' must be 0 when it is set for the very first
+ * time and must be increased by one after each rekey. This function must
+ * be called every time new keys are added to the stream after a rekey.
+ *
+ * If this function is called when the IV Included property has not been
+ * set to the stream the `sid' will be ignored. Returns FALSE if the
+ * IV Included has not been set, TRUE otherwise.
*
***/
-SilcBool silc_packet_set_ids(SilcPacketStream stream,
- SilcIdType src_id_type, const void *src_id,
- SilcIdType dst_id_type, const void *dst_id);
+SilcBool silc_packet_set_sid(SilcPacketStream stream, SilcUInt8 sid);
/****f* silccore/SilcPacketAPI/silc_packet_send
*
* DESCRIPTION
*
* Send `data' of length of `data_len' to the packet stream indicated by
- * `stream'. If ciphers and HMACs were set using silc_packet_set_ciphers
- * and silc_packet_set_hmacs the packet will be encrypted and MAC will be
- * computed for it. If silc_packet_set_ids was used to set source and
- * destination ID for the packet stream those IDs are used in the
- * packet. If IDs have not been set and they need to be provided then
- * silc_packet_send_ext function should be used. Otherwise, the packet
- * will not have IDs set at all. Returns FALSE if packet could not be
- * sent.
+ * `stream'. If ciphers and HMACs were set using silc_packet_set_keys
+ * the packet will be encrypted and MAC will be computed for it. If
+ * silc_packet_set_ids was used to set source and destination ID for the
+ * packet stream those IDs are used in the packet. If IDs have not been
+ * set and they need to be provided then silc_packet_send_ext function
+ * should be used. Otherwise, the packet will not have IDs set at all.
+ * Returns FALSE if packet could not be sent.
*
***/
SilcBool silc_packet_send(SilcPacketStream stream,
* Same as silc_packet_send but with this function different sending
* parameters can be sent as argument. This function can be used to
* set specific IDs, cipher and HMAC to be used in packet sending,
- * instead of the ones saved in the `stream'.
+ * instead of the ones saved in the `stream'. If any of the extra
+ * pointers are NULL, default values set to the stream will apply.
*
***/
SilcBool silc_packet_send_ext(SilcPacketStream stream,
const unsigned char *data, SilcUInt32 data_len,
SilcCipher cipher, SilcHmac hmac);
+/****f* silccore/SilcPacketAPI/silc_packet_send_va
+ *
+ * SYNOPSIS
+ *
+ * SilcBool silc_packet_send_va(SilcPacketStream stream,
+ * SilcPacketType type,
+ * SilcPacketFlags flags, ...);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_packet_send but takes the data in as variable argument
+ * formatted buffer (see silcbuffmt.h). The arguments must be ended
+ * with SILC_STR_END. Returns FALSE if packet could not be sent or
+ * the buffer could not be formatted.
+ *
+ * EXAMPLE
+ *
+ * // Send NEW_CLIENT packet
+ * silc_packet_send_va(stream, SILC_PACKET_NEW_CLIENT, 0,
+ * SILC_STR_UI_SHORT(username_len),
+ * SILC_STR_DATA(username, username_len),
+ * SILC_STR_UI_SHORT(realname_len),
+ * SILC_STR_DATA(realname, realname_len),
+ * SILC_STR_END);
+ *
+ ***/
+SilcBool silc_packet_send_va(SilcPacketStream stream,
+ SilcPacketType type, SilcPacketFlags flags, ...);
+
+/****f* silccore/SilcPacketAPI/silc_packet_send_va_ext
+ *
+ * SYNOPSIS
+ *
+ * SilcBool
+ * silc_packet_send_va_ext(SilcPacketStream stream,
+ * SilcPacketType type, SilcPacketFlags flags,
+ * SilcIdType src_id_type, void *srd_id,
+ * SilcIdType dst_id_type, void *dst_id,
+ * SilcCipher cipher, SilcHmac hmac, ...);
+ *
+ * DESCRIPTION
+ *
+ * Same as silc_packet_send_va but with this function different sending
+ * parameters can be sent as argument. This function can be used to
+ * set specific IDs, cipher and HMAC to be used in packet sending,
+ * instead of the ones saved in the `stream'. If any of the extra
+ * pointers are NULL, default values set to the stream will apply.
+ *
+ ***/
+SilcBool silc_packet_send_va_ext(SilcPacketStream stream,
+ SilcPacketType type, SilcPacketFlags flags,
+ SilcIdType src_id_type, void *src_id,
+ SilcIdType dst_id_type, void *dst_id,
+ SilcCipher cipher, SilcHmac hmac, ...);
+
+/****f* silccore/SilcPacketAPI/silc_packet_wait_init
+ *
+ * SYNOPSIS
+ *
+ * void *silc_packet_wait_init(SilcPacketStream stream,
+ * const SilcID *source_id, ...);
+ *
+ * DESCRIPTION
+ *
+ * Initializes a packet waiter for the packet stream `stream' and
+ * for the variable argument list of packet types. The function
+ * silc_packet_wait can be used to block the thread until a packet
+ * has been received.
+ *
+ * This function is used to initialize the waiting and to give the list
+ * of packet types that caller wish to receive. The variable argument
+ * list must end with -1. To receive all packets use SILC_PACKET_ANY.
+ * If the `source_id' is non-NULL then only packets of the specified
+ * type from the specified `source_id' are received. If it is NULL
+ * then the packet source is ignored.
+ *
+ * Returns a context that must be given to the silc_packet_wait function
+ * as argument. Returns NULL on error. To uninitialize the waiting
+ * call silc_packet_wait_uninit.
+ *
+ * NOTES
+ *
+ * Note that packets may be available immediately after calling this
+ * function and they will be buffered, until silc_packet_wait is called.
+ *
+ * EXAMPLE
+ *
+ * void *waiter;
+ *
+ * // Will wait for private message packets
+ * waiter = silc_packet_wait_init(stream, NULL,
+ * SILC_PACKET_PRIVATE_MESSAGE, -1);
+ *
+ ***/
+void *silc_packet_wait_init(SilcPacketStream stream,
+ const SilcID *source_id, ...);
+
+/****f* silccore/SilcPacketAPI/silc_packet_wait_uninit
+ *
+ * SYNOPSIS
+ *
+ * void silc_packet_wait_uninit(void *waiter, SilcPacketStream stream);
+ *
+ * DESCRIPTION
+ *
+ * Uninitializes the waiting context. This may be called also from
+ * another thread while other thread is waiting for packets. This will
+ * inform the waiting thread to stop waiting.
+ *
+ ***/
+void silc_packet_wait_uninit(void *waiter, SilcPacketStream stream);
+
+/****f* silccore/SilcPacketAPI/silc_packet_wait
+ *
+ * SYNOPSIS
+ *
+ * int silc_packet_wait(void *waiter, int timeout,
+ * SilcPacket *return_packet)
+ *
+ * DESCRIPTION
+ *
+ * A special function that can be used to wait for a packet to arrive.
+ * This function will block the calling process or thread until either
+ * a packet is received into the `return_packet' pointer or the specified
+ * timeout value `timeout', which is in milliseconds, will expire. If
+ * the timeout is 0, no timeout exist. Before calling this function the
+ * silc_packet_wait_init must be called. The caller is responsible for
+ * freeing the returned packet with silc_packet_free.
+ *
+ * This function can be used for example from a thread that wants to
+ * block until SILC packet has been received.
+ *
+ * Returns 1 when packet was received, 0 if timeout occurred and -1 if
+ * error occurred.
+ *
+ * EXAMPLE
+ *
+ * static int foo_read_data(FooContext c)
+ * {
+ * SilcPacket packet;
+ * void *waiter;
+ * ...
+ *
+ * // Will wait for private message packets
+ * if (c->initialized == FALSE) {
+ * waiter = silc_packet_wait_init(stream,
+ * SILC_PACKET_PRIVATE_MESSAGE, -1);
+ * c->initialized = TRUE;
+ * }
+ *
+ * ...
+ * // Wait here until private message packet is received
+ * if ((silc_packet_wait(waiter, 0, &packet)) < 0)
+ * return -1;
+ *
+ * ... process packet ...
+ *
+ * return 1;
+ * }
+ *
+ ***/
+int silc_packet_wait(void *waiter, int timeout, SilcPacket *return_packet);
+
/****f* silccore/SilcPacketAPI/silc_packet_free
*
* SYNOPSIS