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22 * @file include/gnunet_hello_lib.h
23 * @brief helper library for handling HELLOs
24 * @author Christian Grothoff
27 #ifndef GNUNET_HELLO_LIB_H
28 #define GNUNET_HELLO_LIB_H
33 #if 0 /* keep Emacsens' auto-indent happy */
38 #include "gnunet_common.h"
39 #include "gnunet_crypto_lib.h"
42 * A HELLO message is used to exchange information about
43 * transports with other peers. This struct is guaranteed
44 * to start with a "GNUNET_MessageHeader", everything else
45 * should be internal to the HELLO library.
47 struct GNUNET_HELLO_Message;
51 * Copy the given address information into
52 * the given buffer using the format of HELLOs.
54 * @param tname name of the transport plugin
55 * @param expiration expiration for the address
56 * @param addr the address
57 * @param addr_len length of the address in bytes
58 * @param target where to copy the address
59 * @param max maximum number of bytes to copy to target
60 * @return number of bytes copied, 0 if
61 * the target buffer was not big enough.
64 GNUNET_HELLO_add_address (const char *tname,
65 struct GNUNET_TIME_Absolute expiration,
67 size_t addr_len, char *target, size_t max);
71 * Callback function used to fill a buffer of max bytes with a list of
72 * addresses in the format used by HELLOs. Should use
73 * "GNUNET_HELLO_add_address" as a helper function.
76 * @param max maximum number of bytes that can be written to buf
77 * @param buf where to write the address information
78 * @return number of bytes written, 0 to signal the
79 * end of the iteration.
82 (*GNUNET_HELLO_GenerateAddressListCallback) (void *cls,
83 size_t max, void *buf);
87 * Construct a HELLO message given the public key,
88 * expiration time and an iterator that spews the
89 * transport addresses.
91 * @return the hello message
93 struct GNUNET_HELLO_Message *GNUNET_HELLO_create (const struct
94 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
96 GNUNET_HELLO_GenerateAddressListCallback
97 addrgen, void *addrgen_cls);
101 * Return the size of the given HELLO message.
102 * @param hello to inspect
103 * @return the size, 0 if HELLO is invalid
105 uint16_t GNUNET_HELLO_size (const struct GNUNET_HELLO_Message *hello);
109 * Construct a HELLO message by merging the
110 * addresses in two existing HELLOs (which
111 * must be for the same peer).
113 * @param h1 first HELLO message
114 * @param h2 the second HELLO message
115 * @return the combined hello message
117 struct GNUNET_HELLO_Message *GNUNET_HELLO_merge (const struct
118 GNUNET_HELLO_Message *h1,
120 GNUNET_HELLO_Message *h2);
125 * Iterator callback to go over all addresses.
128 * @param tname name of the transport
129 * @param expiration expiration time
130 * @param addr the address
131 * @param addrlen length of the address
132 * @return GNUNET_OK to keep the address,
133 * GNUNET_NO to delete it from the HELLO
134 * GNUNET_SYSERR to stop iterating (but keep current address)
137 (*GNUNET_HELLO_AddressIterator) (void *cls,
139 struct GNUNET_TIME_Absolute expiration,
140 const void *addr, size_t addrlen);
144 * Iterate over all of the addresses in the HELLO.
146 * @param msg HELLO to iterate over; client does not need to
147 * have verified that msg is well-formed (beyond starting
148 * with a GNUNET_MessageHeader of the right type).
149 * @param return_modified if a modified copy should be returned,
150 * otherwise NULL will be returned
151 * @param it iterator to call on each address
152 * @param it_cls closure for it
154 struct GNUNET_HELLO_Message *GNUNET_HELLO_iterate_addresses (const struct
159 GNUNET_HELLO_AddressIterator
165 * Iterate over addresses in "new_hello" that
166 * are NOT already present in "old_hello".
168 * @param new_hello a HELLO message
169 * @param old_hello a HELLO message
170 * @param expiration_limit ignore addresses in old_hello
171 * that expired before the given time stamp
172 * @param it iterator to call on each address
173 * @param it_cls closure for it
176 GNUNET_HELLO_iterate_new_addresses (const struct GNUNET_HELLO_Message
178 const struct GNUNET_HELLO_Message
180 struct GNUNET_TIME_Absolute
182 GNUNET_HELLO_AddressIterator it,
187 * Get the public key from a HELLO message.
189 * @param hello the hello message
190 * @param publicKey where to copy the public key information, can be NULL
191 * @return GNUNET_SYSERR if the HELLO was malformed
194 GNUNET_HELLO_get_key (const struct GNUNET_HELLO_Message *hello,
195 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
200 * Get the peer identity from a HELLO message.
202 * @param hello the hello message
203 * @param peer where to store the peer's identity
204 * @return GNUNET_SYSERR if the HELLO was malformed
207 GNUNET_HELLO_get_id (const struct GNUNET_HELLO_Message *hello,
208 struct GNUNET_PeerIdentity *peer);
210 /* ifndef GNUNET_HELLO_LIB_H */
212 /* end of gnunet_hello_lib.h */