/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006 Christian Grothoff (and other contributing authors)
+ (C) 2001, 2002, 2003, 2004, 2005, 2006, 2010, 2011 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
#endif
#endif
-#include "gnunet_common.h"
-#include "gnunet_crypto_lib.h"
+#include "gnunet_util_lib.h"
+
+
+/**
+ * Prefix that every HELLO URI must start with.
+ */
+#define GNUNET_HELLO_URI_PREFIX "gnunet://hello/"
+
+/**
+ * Prefix that every FRIEND HELLO URI must start with.
+ */
+#define GNUNET_FRIEND_HELLO_URI_PREFIX "gnunet://friend-hello/"
+
+/**
+ * An address for communicating with a peer. We frequently
+ * need this tuple and the components cannot really be
+ * separated. This is NOT the format that would be used
+ * on the wire.
+ */
+struct GNUNET_HELLO_Address
+{
+
+ /**
+ * For which peer is this an address?
+ */
+ struct GNUNET_PeerIdentity peer;
+
+ /**
+ * Name of the transport plugin enabling the communication using
+ * this address.
+ */
+ const char *transport_name;
+
+ /**
+ * Binary representation of the address (plugin-specific).
+ */
+ const void *address;
+
+ /**
+ * Number of bytes in 'address'.
+ */
+ size_t address_length;
+
+};
+
+
+/**
+ * Allocate an address struct.
+ *
+ * @param peer the peer
+ * @param transport_name plugin name
+ * @param address binary address
+ * @param address_length number of bytes in 'address'
+ * @return the address struct
+ */
+struct GNUNET_HELLO_Address *
+GNUNET_HELLO_address_allocate (const struct GNUNET_PeerIdentity *peer,
+ const char *transport_name, const void *address,
+ size_t address_length);
+
+
+/**
+ * Copy an address struct.
+ *
+ * @param address address to copy
+ * @return a copy of the address struct
+ */
+struct GNUNET_HELLO_Address *
+GNUNET_HELLO_address_copy (const struct GNUNET_HELLO_Address *address);
+
+
+/**
+ * Compare two addresses. Does NOT compare the peer identity,
+ * that is assumed already to match!
+ *
+ * @param a1 first address
+ * @param a2 second address
+ * @return 0 if the addresses are equal, -1 if a1<a2, 1 if a1>a2.
+ */
+int
+GNUNET_HELLO_address_cmp (const struct GNUNET_HELLO_Address *a1,
+ const struct GNUNET_HELLO_Address *a2);
+
+
+/**
+ * Get the size of an address struct.
+ *
+ * @param address address
+ * @return the size
+ */
+size_t
+GNUNET_HELLO_address_get_size (const struct GNUNET_HELLO_Address *address);
+
+/**
+ * Free an address.
+ *
+ * @param addr address to free
+ */
+#define GNUNET_HELLO_address_free(addr) GNUNET_free(addr)
+
/**
* A HELLO message is used to exchange information about
struct GNUNET_HELLO_Message;
+/** Return HELLO type
+ *
+ * @param h HELLO Message to test
+ * @return GNUNET_YES or GNUNET_NO
+ */
+int
+GNUNET_HELLO_is_friend_only (const struct GNUNET_HELLO_Message *h);
+
+
/**
* Copy the given address information into
* the given buffer using the format of HELLOs.
*
- * @param tname name of the transport plugin
+ * @param address address to add
* @param expiration expiration for the address
- * @param addr the address
- * @param addr_len length of the address in bytes
* @param target where to copy the address
* @param max maximum number of bytes to copy to target
* @return number of bytes copied, 0 if
* the target buffer was not big enough.
*/
size_t
-GNUNET_HELLO_add_address (const char *tname,
- struct GNUNET_TIME_Absolute expiration,
- const void *addr,
- size_t addr_len, char *target, size_t max);
+GNUNET_HELLO_add_address (const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration, char *target,
+ size_t max);
/**
* @return number of bytes written, 0 to signal the
* end of the iteration.
*/
-typedef size_t
- (*GNUNET_HELLO_GenerateAddressListCallback) (void *cls,
- size_t max, void *buf);
+typedef size_t (*GNUNET_HELLO_GenerateAddressListCallback) (void *cls,
+ size_t max,
+ void *buf);
/**
* expiration time and an iterator that spews the
* transport addresses.
*
+ * If friend only is set to GNUNET_YES we create a FRIEND_HELLO which will
+ * not be gossiped to other peers
+ *
* @return the hello message
*/
-struct GNUNET_HELLO_Message *GNUNET_HELLO_create (const struct
- GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
- *publicKey,
- GNUNET_HELLO_GenerateAddressListCallback
- addrgen, void *addrgen_cls);
+struct GNUNET_HELLO_Message *
+GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EddsaPublicKey *publicKey,
+ GNUNET_HELLO_GenerateAddressListCallback addrgen,
+ void *addrgen_cls,
+ int friend_only);
/**
* @param hello to inspect
* @return the size, 0 if HELLO is invalid
*/
-uint16_t GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello);
+uint16_t
+GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello);
/**
* @param h2 the second HELLO message
* @return the combined hello message
*/
-struct GNUNET_HELLO_Message *GNUNET_HELLO_merge (const struct
- GNUNET_HELLO_Message *h1,
- const struct
- GNUNET_HELLO_Message *h2);
+struct GNUNET_HELLO_Message *
+GNUNET_HELLO_merge (const struct GNUNET_HELLO_Message *h1,
+ const struct GNUNET_HELLO_Message *h2);
+
+
+/**
+ * Test if two HELLO messages contain the same addresses.
+ * If they only differ in expiration time, the lowest
+ * expiration time larger than 'now' where they differ
+ * is returned.
+ *
+ * @param h1 first HELLO message
+ * @param h2 the second HELLO message
+ * @param now time to use for deciding which addresses have
+ * expired and should not be considered at all
+ * @return absolute time forever if the two HELLOs are
+ * totally identical; smallest timestamp >= now if
+ * they only differ in timestamps;
+ * zero if the some addresses with expirations >= now
+ * do not match at all
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_HELLO_equals (const struct GNUNET_HELLO_Message *h1,
+ const struct GNUNET_HELLO_Message *h2,
+ struct GNUNET_TIME_Absolute now);
/**
* Iterator callback to go over all addresses.
*
* @param cls closure
- * @param tname name of the transport
+ * @param address the address
* @param expiration expiration time
- * @param addr the address
- * @param addrlen length of the address
* @return GNUNET_OK to keep the address,
* GNUNET_NO to delete it from the HELLO
* GNUNET_SYSERR to stop iterating (but keep current address)
*/
-typedef int
- (*GNUNET_HELLO_AddressIterator) (void *cls,
- const char *tname,
- struct GNUNET_TIME_Absolute expiration,
- const void *addr, size_t addrlen);
+typedef int (*GNUNET_HELLO_AddressIterator) (void *cls,
+ const struct GNUNET_HELLO_Address *
+ address,
+ struct GNUNET_TIME_Absolute
+ expiration);
+
+
+/**
+ * When does the last address in the given HELLO expire?
+ *
+ * @param msg HELLO to inspect
+ * @return time the last address expires, 0 if there are no addresses in the HELLO
+ */
+struct GNUNET_TIME_Absolute
+GNUNET_HELLO_get_last_expiration (const struct GNUNET_HELLO_Message *msg);
/**
* otherwise NULL will be returned
* @param it iterator to call on each address
* @param it_cls closure for it
+ * @return the modified HELLO or NULL
*/
-struct GNUNET_HELLO_Message *GNUNET_HELLO_iterate_addresses (const struct
- GNUNET_HELLO_Message
- *msg,
- int
- return_modified,
- GNUNET_HELLO_AddressIterator
- it,
- void *it_cls);
+struct GNUNET_HELLO_Message *
+GNUNET_HELLO_iterate_addresses (const struct GNUNET_HELLO_Message *msg,
+ int return_modified,
+ GNUNET_HELLO_AddressIterator it, void *it_cls);
/**
*/
int
GNUNET_HELLO_get_key (const struct GNUNET_HELLO_Message *hello,
- struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
- *publicKey);
+ struct GNUNET_CRYPTO_EddsaPublicKey *publicKey);
+
+
+/**
+ * Get the peer identity from a HELLO message.
+ *
+ * @param hello the hello message
+ * @param peer where to store the peer's identity
+ * @return GNUNET_SYSERR if the HELLO was malformed
+ */
+int
+GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello,
+ struct GNUNET_PeerIdentity *peer);
+
+/**
+ * Get the header from a HELLO message, used so other code
+ * can correctly send HELLO messages.
+ *
+ * @param hello the hello message
+ *
+ * @return header or NULL if the HELLO was malformed
+ */
+struct GNUNET_MessageHeader *
+GNUNET_HELLO_get_header (struct GNUNET_HELLO_Message *hello);
+
+
+typedef struct GNUNET_TRANSPORT_PluginFunctions *
+(*GNUNET_HELLO_TransportPluginsFind) (const char *name);
+
+
+/**
+ * Compose a hello URI string from a hello message.
+ *
+ * @param hello Hello message
+ * @param plugins_find Function to find transport plugins by name
+ * @return Hello URI string
+ */
+char *
+GNUNET_HELLO_compose_uri (const struct GNUNET_HELLO_Message *hello,
+ GNUNET_HELLO_TransportPluginsFind plugins_find);
+
+/**
+ * Parse a hello URI string to a hello message.
+ *
+ * @param uri URI string to parse
+ * @param pubkey Pointer to struct where public key is parsed
+ * @param hello Pointer to struct where hello message is parsed
+ * @param plugins_find Function to find transport plugins by name
+ * @return GNUNET_OK on success, GNUNET_SYSERR if the URI was invalid, GNUNET_NO on other errors
+ */
+int
+GNUNET_HELLO_parse_uri (const char *uri,
+ struct GNUNET_CRYPTO_EddsaPublicKey *pubkey,
+ struct GNUNET_HELLO_Message **hello,
+ GNUNET_HELLO_TransportPluginsFind plugins_find);
+
+#if 0 /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
/* ifndef GNUNET_HELLO_LIB_H */
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