/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2010, 2011 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2010, 2011 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
- * @file include/gnunet_hello_lib.h
- * @brief helper library for handling HELLOs
* @author Christian Grothoff
+ * @file
+ * Helper library for handling HELLOs
+ *
+ * @defgroup hello Hello library
+ * Helper library for handling HELLOs
+ *
+ * @see [Documentation](https://gnunet.org/gnunets-hostlist-subsystem)
+ *
+ * @{
*/
#ifndef GNUNET_HELLO_LIB_H
*/
#define GNUNET_FRIEND_HELLO_URI_PREFIX "gnunet://friend-hello/"
+/**
+ * Separator used in HELLO URI
+ */
+#define GNUNET_HELLO_URI_SEP '+'
+
/**
* Additional local information about an address
*/
struct GNUNET_PeerIdentity peer;
- /**
- * Extended information about address
- *
- * This field contains additional #GNUNET_HELLO_AddressInfo flags e.g.
- * to indicate an address is inbound and cannot be used to initiate an
- * outbound connection.
- *
- * These information are only valid for the local peer and are not serialized
- * when a #GNUNET_HELLO_Message is created
- */
- enum GNUNET_HELLO_AddressInfo local_info;
-
/**
* Name of the transport plugin enabling the communication using
* this address.
const void *address;
/**
- * Number of bytes in 'address'.
+ * Number of bytes in @e address.
*/
size_t address_length;
+ /**
+ * Extended information about address
+ *
+ * This field contains additional #GNUNET_HELLO_AddressInfo flags e.g.
+ * to indicate an address is inbound and cannot be used to initiate an
+ * outbound connection.
+ *
+ * These information are only valid for the local peer and are not serialized
+ * when a #GNUNET_HELLO_Message is created
+ */
+ enum GNUNET_HELLO_AddressInfo local_info;
+
};
* @param peer the peer
* @param transport_name plugin name
* @param address binary address
- * @param address_length number of bytes in 'address'
- * @param local_info additional address information, will not get serialized
+ * @param address_length number of bytes in @a address
+ * @param local_info additional local information for the 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,
+ const char *transport_name,
+ const void *address,
size_t address_length,
enum GNUNET_HELLO_AddressInfo local_info);
*
* @param a1 first address
* @param a2 second address
- * @return 0 if the addresses are equal, -1 if a1<a2, 1 if a1>a2.
+ * @return 0 if the addresses are equal, -1 if @a a1< @a a2, 1 if @a a1> @a 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.
*
GNUNET_HELLO_address_get_size (const struct GNUNET_HELLO_Address *address);
+/**
+ * Check if an address has a local option set
+ *
+ * @param address the address to check
+ * @param option the respective option to check for
+ * @return #GNUNET_YES or #GNUNET_NO
+ */
+int
+GNUNET_HELLO_address_check_option (const struct GNUNET_HELLO_Address *address,
+ enum GNUNET_HELLO_AddressInfo option);
+
+
/**
* Free an address.
*
#define GNUNET_HELLO_address_free(addr) GNUNET_free(addr)
+GNUNET_NETWORK_STRUCT_BEGIN
+
/**
* A HELLO message is used to exchange information about
- * transports with other peers. This struct is guaranteed
- * to start with a "GNUNET_MessageHeader", everything else
- * should be internal to the HELLO library.
+ * transports with other peers. This struct is always
+ * followed by the actual network addresses which have
+ * the format:
+ *
+ * 1) transport-name (0-terminated)
+ * 2) address-length (uint16_t, network byte order; possibly
+ * unaligned!)
+ * 3) address expiration (`struct GNUNET_TIME_AbsoluteNBO`); possibly
+ * unaligned!)
+ * 4) address (address-length bytes; possibly unaligned!)
*/
-struct GNUNET_HELLO_Message;
+struct GNUNET_HELLO_Message
+{
+ /**
+ * Type will be #GNUNET_MESSAGE_TYPE_HELLO.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Use in F2F mode: Do not gossip this HELLO message
+ */
+ uint32_t friend_only GNUNET_PACKED;
+
+ /**
+ * The public key of the peer.
+ */
+ struct GNUNET_CRYPTO_EddsaPublicKey publicKey;
+
+};
+GNUNET_NETWORK_STRUCT_END
+
-/** Return HELLO type
+/**
+ * Return HELLO type
*
* @param h HELLO Message to test
- * @return GNUNET_YES or GNUNET_NO
+ * @return #GNUNET_YES for friend-only or #GNUNET_NO otherwise
*/
int
GNUNET_HELLO_is_friend_only (const struct GNUNET_HELLO_Message *h);
* @param address address to add
* @param expiration expiration for the address
* @param target where to copy the address
- * @param max maximum number of bytes to copy to target
+ * @param max maximum number of bytes to copy to @a target
* @return number of bytes copied, 0 if
* the target buffer was not big enough.
*/
size_t
GNUNET_HELLO_add_address (const struct GNUNET_HELLO_Address *address,
- struct GNUNET_TIME_Absolute expiration, char *target,
+ struct GNUNET_TIME_Absolute expiration,
+ char *target,
size_t max);
/**
* Callback function used to fill a buffer of max bytes with a list of
* addresses in the format used by HELLOs. Should use
- * "GNUNET_HELLO_add_address" as a helper function.
+ * #GNUNET_HELLO_add_address() as a helper function.
*
* @param cls closure
- * @param max maximum number of bytes that can be written to buf
+ * @param max maximum number of bytes that can be written to @a buf
* @param buf where to write the address information
- * @return number of bytes written, 0 to signal the
+ * @return number of bytes written or 0, #GNUNET_SYSERR to signal the
* end of the iteration.
*/
-typedef size_t (*GNUNET_HELLO_GenerateAddressListCallback) (void *cls,
- size_t max,
- void *buf);
+typedef ssize_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
+ * If friend only is set to #GNUNET_YES we create a FRIEND_HELLO which
+ * will not be gossiped to other peers.
*
+ * @param public_key public key to include in the HELLO
+ * @param addrgen callback to invoke to get addresses
+ * @param addrgen_cls closure for @a addrgen
+ * @param friend_only should the returned HELLO be only visible to friends?
* @return the hello message
*/
struct GNUNET_HELLO_Message *
-GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EddsaPublicKey *publicKey,
+GNUNET_HELLO_create (const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
GNUNET_HELLO_GenerateAddressListCallback addrgen,
void *addrgen_cls,
int friend_only);
/**
* Return the size of the given HELLO message.
+ *
* @param hello to inspect
* @return the size, 0 if HELLO is invalid
*/
* @param cls closure
* @param address the address
* @param expiration expiration time
- * @return GNUNET_OK to keep the address,
- * GNUNET_NO to delete it from the HELLO
- * GNUNET_SYSERR to stop iterating (but keep current 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 struct GNUNET_HELLO_Address *
- address,
- struct GNUNET_TIME_Absolute
- expiration);
+typedef int
+(*GNUNET_HELLO_AddressIterator) (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration);
/**
* @param return_modified if a modified copy should be returned,
* otherwise NULL will be returned
* @param it iterator to call on each address
- * @param it_cls closure for it
+ * @param it_cls closure for @a it
* @return the modified HELLO or NULL
*/
struct GNUNET_HELLO_Message *
/**
- * Iterate over addresses in "new_hello" that
- * are NOT already present in "old_hello".
+ * Iterate over addresses in @a new_hello that are NOT already present
+ * in @a old_hello. Note that if the address is present in @a old_hello
+ * but the expiration time in @a new_hello is more recent, the
+ * iterator is also called.
*
* @param new_hello a HELLO message
* @param old_hello a HELLO message
* @param expiration_limit ignore addresses in old_hello
* that expired before the given time stamp
* @param it iterator to call on each address
- * @param it_cls closure for it
+ * @param it_cls closure for @a it
*/
void
-GNUNET_HELLO_iterate_new_addresses (const struct GNUNET_HELLO_Message
- *new_hello,
- const struct GNUNET_HELLO_Message
- *old_hello,
- struct GNUNET_TIME_Absolute
- expiration_limit,
+GNUNET_HELLO_iterate_new_addresses (const struct GNUNET_HELLO_Message *new_hello,
+ const struct GNUNET_HELLO_Message *old_hello,
+ struct GNUNET_TIME_Absolute expiration_limit,
GNUNET_HELLO_AddressIterator it,
void *it_cls);
-/**
- * Get the public key from a HELLO message.
- *
- * @param hello the hello message
- * @param publicKey where to copy the public key information, can be NULL
- * @return GNUNET_SYSERR if the HELLO was malformed
- */
-int
-GNUNET_HELLO_get_key (const struct GNUNET_HELLO_Message *hello,
- 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
+ * @return #GNUNET_SYSERR if the HELLO was malformed
*/
int
GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello,
GNUNET_HELLO_get_header (struct GNUNET_HELLO_Message *hello);
+/**
+ * Helper function to load/access transport plugins.
+ * FIXME: pass closure!
+ *
+ * @param name name of the transport plugin to load
+ * @return NULL if a plugin with name @a name is not known/loadable
+ */
typedef struct GNUNET_TRANSPORT_PluginFunctions *
(*GNUNET_HELLO_TransportPluginsFind) (const char *name);
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 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
+ * @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_HELLO_Message **hello,
GNUNET_HELLO_TransportPluginsFind plugins_find);
+
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
}
#endif
-
/* ifndef GNUNET_HELLO_LIB_H */
#endif
+
+/** @} */ /* end of group */
+
/* end of gnunet_hello_lib.h */
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