Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
- Copyright (C) 1997 - 2000 Pekka Riikonen
+ Copyright (C) 1997 - 2001 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
/* All defined packet flags */
#define SILC_PACKET_FLAG_NONE 0x00
#define SILC_PACKET_FLAG_PRIVMSG_KEY 0x01
-#define SILC_PACKET_FLAG_FORWARDED 0x02 /* XXX deprecated 26062000 */
+#define SILC_PACKET_FLAG_LIST 0x02
#define SILC_PACKET_FLAG_BROADCAST 0x04
+#define SILC_PACKET_FLAG_TUNNELED 0x08
/* Rest of flags still available
-#define SILC_PACKET_FLAG_XXX 0x08
#define SILC_PACKET_FLAG_XXX 0x10
#define SILC_PACKET_FLAG_XXX 0x20
#define SILC_PACKET_FLAG_XXX 0x40
Packet flags. Flags are defined above.
unsigned char *src_id
- unsigned int src_id_len
- SilcIdType src_id_type
+ unsigned short src_id_len
+ unsigned char src_id_type
Source ID, its length and type. On packet reception retuned ID's
are always the hash values of the ID's from the packet.
+ unsigned char *dst_id;
+ unsigned short dst_id_len;
+ unsigned char src_id_type;
+
+ Destination ID, its length and type. On packet reception retuned
+ ID's are always the hash values of the ID's from the packet.
+
SilcHash hash
Pointer to allocated hash object. This must be MD5 hash object.
SilcPacketFlags flags;
unsigned char *src_id;
- unsigned int src_id_len;
- SilcIdType src_id_type;
+ unsigned short src_id_len;
+ unsigned char src_id_type;
unsigned char *dst_id;
- unsigned int dst_id_len;
- SilcIdType dst_id_type;
+ unsigned short dst_id_len;
+ unsigned char dst_id_type;
- unsigned int truelen;
- unsigned int padlen;
+ unsigned short truelen;
+ unsigned short padlen;
/* For padding generation */
SilcRng rng;
+
+ /* Back pointers */
+ void *context;
+ SilcSocketConnection sock;
+
+ /* Reference count for this context. The context is free'd only
+ after the reference count is zero. */
+ int users;
} SilcPacketContext;
+/*
+ Silc Packet Parser context.
+
+ This context is used in packet reception when silc_packet_receive_process
+ function calls parser callback that performs the actual packet decryption
+ and parsing. This context is sent as argument to the parser function.
+ This context must be free'd by the parser callback function.
+
+ Following description of the fields:
+
+ SilcPacketContext *packet
+
+ The actual packet received from the network. In this phase the
+ context is not parsed, only the packet->buffer is allocated and
+ it includes the raw packet data, which is encrypted.
+
+ SilcSocketConnection sock
+
+ The associated connection.
+
+ SilcCipher cipher
+
+ The cipher to be used in the decryption.
+
+ SilcHmac hmac
+
+ The HMAC to be used in the decryption.
+
+ void *context
+
+ User context that is sent to the silc_packet_receive_process
+ function. This usually includes application and connection specific
+ data.
+
+*/
+
+typedef struct {
+ SilcPacketContext *packet;
+ SilcSocketConnection sock;
+ SilcCipher cipher;
+ SilcHmac hmac;
+ void *context;
+} SilcPacketParserContext;
+
+/* The parser callback function. */
+typedef void (*SilcPacketParserCallback)(SilcPacketParserContext
+ *parse_context);
+
+
/* SILC Packet types. */
#define SILC_PACKET_NONE 0 /* NULL, never sent */
#define SILC_PACKET_DISCONNECT 1 /* Disconnection */
#define SILC_PACKET_CONNECTION_AUTH_REQUEST 16 /* Request of auth meth */
#define SILC_PACKET_CONNECTION_AUTH 17 /* Connectinon auth */
#define SILC_PACKET_NEW_ID 18 /* Sending new ID */
-#define SILC_PACKET_NEW_ID_LIST 19 /* Sending list of them */
-#define SILC_PACKET_NEW_CLIENT 20 /* Registering client */
-#define SILC_PACKET_NEW_SERVER 21 /* Registering server */
-#define SILC_PACKET_NEW_CHANNEL 22 /* Registering channel */
-#define SILC_PACKET_NEW_CHANNEL_USER 23 /* "" user on channel */
-#define SILC_PACKET_NEW_CHANNEL_LIST 24 /* List of new channels */
-#define SILC_PACKET_NEW_CHANNEL_USER_LIST 25 /* List of users on "" */
-#define SILC_PACKET_REPLACE_ID 26 /* To replace old ID */
-#define SILC_PACKET_REMOVE_ID 27 /* To remove ID */
-/* #define SILC_PACKET_MAX 255 */
+#define SILC_PACKET_NEW_CLIENT 19 /* Client registering */
+#define SILC_PACKET_NEW_SERVER 20 /* Server registering */
+#define SILC_PACKET_NEW_CHANNEL 21 /* Channel registering */
+#define SILC_PACKET_REKEY 22 /* Re-key start */
+#define SILC_PACKET_REKEY_DONE 23 /* Re-key done */
+#define SILC_PACKET_HEARTBEAT 24 /* Heartbeat */
+
+#define SILC_PACKET_PRIVATE 200 /* Private range start */
+#define SILC_PACKET_MAX 255 /* RESERVED */
/* Macros */
/* Prototypes */
int silc_packet_write(int sock, SilcBuffer src);
+int silc_packet_send(SilcSocketConnection sock, int force_send);
+void silc_packet_encrypt(SilcCipher cipher, SilcHmac hmac,
+ SilcBuffer buffer, unsigned int len);
+void silc_packet_assemble(SilcPacketContext *ctx);
+void silc_packet_send_prepare(SilcSocketConnection sock,
+ unsigned int header_len,
+ unsigned int padlen,
+ unsigned int data_len);
int silc_packet_read(int sock, SilcBuffer dest);
-void silc_packet_encrypt(SilcCipher cipher, SilcBuffer buffer,
- unsigned int len);
-void silc_packet_decrypt(SilcCipher cipher, SilcBuffer buffer,
- unsigned int len);
+int silc_packet_receive(SilcSocketConnection sock);
+int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
+ SilcBuffer buffer, SilcPacketContext *packet);
+void silc_packet_receive_process(SilcSocketConnection sock,
+ SilcCipher cipher, SilcHmac hmac,
+ SilcPacketParserCallback parser,
+ void *context);
SilcPacketType silc_packet_parse(SilcPacketContext *ctx);
SilcPacketType silc_packet_parse_special(SilcPacketContext *ctx);
-void silc_packet_assemble(SilcPacketContext *ctx);
+SilcPacketContext *silc_packet_context_alloc();
+SilcPacketContext *silc_packet_context_dup(SilcPacketContext *ctx);
+void silc_packet_context_free(SilcPacketContext *ctx);
#endif
projects / silc.git / blobdiff