+
+/**
+ * Prefix that every HELLO URI must start with.
+ */
+#define GNUNET_HELLO_URI_PREFIX "gnunet://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)
+
+