+ }
+ return GNUNET_YES;
+}
+
+
+/**
+ * Helper function for #GNUNET_HELLO_equals(). Checks
+ * if the given @a address exists also in the other HELLO;
+ * if not, the result time is set to zero and the iteration
+ * is aborted.
+ *
+ * @param cls the `struct EqualsContext`
+ * @param address address to locate
+ * @param expiration expiration time of the current address
+ * @return #GNUNET_OK if the address exists or is expired,
+ * #GNUNET_SYSERR if it was not found
+ */
+static int
+find_matching (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
+{
+ struct EqualsContext *ec = cls;
+
+ if (expiration.abs_value_us < ec->expiration_limit.abs_value_us)
+ return GNUNET_OK; /* expired, we don't care */
+ ec->address = address;
+ ec->expiration = expiration;
+ ec->found = GNUNET_NO;
+ GNUNET_HELLO_iterate_addresses (ec->ref,
+ GNUNET_NO,
+ &find_other_matching,
+ ec);
+ if (GNUNET_NO == ec->found)
+ {
+ /* not found, we differ *now* */
+ ec->result = GNUNET_TIME_UNIT_ZERO_ABS;
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Test if two HELLO messages contain the same addresses.
+ * If they only differ in expiration time, the lowest
+ * expiration time larger than @a 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 >= @a now if
+ * they only differ in timestamps;
+ * zero if the some addresses with expirations >= @a 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)
+{
+ struct EqualsContext ec;
+
+ if (h1->header.type != h2->header.type)
+ return GNUNET_TIME_UNIT_ZERO_ABS;
+ if (0 !=
+ memcmp (&h1->publicKey,
+ &h2->publicKey,
+ sizeof (struct GNUNET_CRYPTO_EddsaPublicKey)))
+ return GNUNET_TIME_UNIT_ZERO_ABS;
+ ec.expiration_limit = now;
+ ec.result = GNUNET_TIME_UNIT_FOREVER_ABS;
+ ec.ref = h2;
+ GNUNET_HELLO_iterate_addresses (h1,
+ GNUNET_NO,
+ &find_matching,
+ &ec);
+ if (ec.result.abs_value_us == GNUNET_TIME_UNIT_ZERO.rel_value_us)
+ return ec.result;
+ ec.ref = h1;
+ GNUNET_HELLO_iterate_addresses (h2,
+ GNUNET_NO,
+ &find_matching,
+ &ec);
+ return ec.result;
+}
+
+
+/**
+ * Iterator to find the time when the last address will expire.
+ * Updates the maximum value stored in @a cls.
+ *
+ * @param cls where to store the max, a `struct GNUNET_TIME_Absolute`
+ * @param address an address (ignored)
+ * @param expiration expiration time for @a address
+ * @return #GNUNET_OK (always)
+ */
+static int
+find_max_expire (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
+{
+ struct GNUNET_TIME_Absolute *max = cls;
+
+ *max = GNUNET_TIME_absolute_max (*max, expiration);
+ return GNUNET_OK;
+}
+
+
+/**
+ * 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)
+{
+ struct GNUNET_TIME_Absolute ret;
+
+ ret = GNUNET_TIME_UNIT_ZERO_ABS;
+ GNUNET_HELLO_iterate_addresses (msg,
+ GNUNET_NO,
+ &find_max_expire,
+ &ret);
+ return ret;
+}
+
+
+/**
+ * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER".
+ * The specific structure of "IDENTIFIER" depends on the module and
+ * maybe differenciated into additional subcategories if applicable.
+ * This module only deals with hello identifiers (MODULE = "hello").
+ * <p>
+ *
+ * The concrete URI format is:
+ *
+ * "gnunet://hello/PEER[+YYYYMMDDHHMMSS+<TYPE>+<ADDRESS>]...".
+ * These URIs can be used to add a peer record to peerinfo service.
+ * PEER is the string representation of peer's public key.
+ * YYYYMMDDHHMMSS is the expiration date.
+ * TYPE is a transport type.
+ * ADDRESS is the address, its format depends upon the transport type.
+ * The concrete transport types and corresponding address formats are:
+ *
+ * <ul><li>
+ *
+ * <TCP|UDP>!IPADDRESS
+ * IPVDDRESS is either IPV4 .-delimited address in form of XXX.XXX.XXX.XXX:PPPPP
+ * or IPV6 :-delimited address with '[' and ']' (according to RFC2732):
+ * [XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX]:PPPPP
+ * PPPPP is the port number. May be 0.
+ *
+ * </li><li>
+ *
+ * [add SMTP, HTTP and other addresses here]
+ *
+ * </li></ul>
+ *
+ * The encoding for hexadecimal values is defined in the crypto_hash.c
+ * module in the gnunetutil library and discussed there.
+ *
+ * Examples:
+ *
+ * gnunet://hello/V8XXK9GAN5ZJFRFQP8MQX3D83BZTSBQVHKWWD0JPE63Z821906EG+20120302010059+TCP+192.168.0.1:2086+TCP+64.23.8.174:0
+ * gnunet://hello/V8XXK9GAN5ZJFRFQP8MQX3D83BZTSBQVHKWWD0JPE63Z821906EG+20120302010059+TCP+[2001:db8:85a3:8d3:1319:8a2e:370:7348]:2086
+ *
+ * <p>
+ */
+
+
+
+/**
+ * Function that is called on each address of this peer.
+ * Expands the corresponding URI string.
+ *
+ * @param cls the `struct GNUNET_HELLO_ComposeUriContext`
+ * @param address address to add
+ * @param expiration expiration time for the address
+ * @return #GNUNET_OK (continue iteration).
+ */
+static int
+add_address_to_uri (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ struct GNUNET_TIME_Absolute expiration)
+{
+ struct GNUNET_HELLO_ComposeUriContext *ctx = cls;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ const char *addr;
+ char *ret;
+ char *addr_dup;
+ char *pos;
+ char tbuf[16] = "";
+ char *client_str = "_client";
+ struct tm *t;
+ time_t seconds;
+
+ papi = ctx->plugins_find (address->transport_name);
+ if (NULL == papi)
+ {
+ /* Not an error - we might just not have the right plugin. */
+ return GNUNET_OK;
+ }
+ if (NULL == papi->address_to_string)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "URI conversion not implemented for plugin `%s'\n",
+ address->transport_name);
+ return GNUNET_OK;
+ }
+ addr = papi->address_to_string (papi->cls,
+ address->address,
+ address->address_length);
+ if ( (NULL == addr) ||
+ (0 == strlen(addr)) )
+ return GNUNET_OK;
+
+ addr_dup = GNUNET_strdup (addr);
+ if (NULL != (pos = strstr (addr_dup, "_server")))
+ GNUNET_memcpy (pos,
+ client_str,
+ strlen (client_str)); /* Replace all server addresses with client addresses */
+
+ seconds = expiration.abs_value_us / 1000LL / 1000LL;
+ t = gmtime (&seconds);
+
+ GNUNET_asprintf (&ret,
+ "%s%c%s%c%s%c%s",
+ ctx->uri,
+ GNUNET_HELLO_URI_SEP,
+ strftime (tbuf,
+ sizeof (tbuf),
+ "%Y%m%d%H%M%S",
+ t) ? tbuf : "0",
+ GNUNET_HELLO_URI_SEP,
+ address->transport_name,
+ GNUNET_HELLO_URI_SEP,
+ addr_dup);
+ GNUNET_free (addr_dup);
+ GNUNET_free (ctx->uri);
+ ctx->uri = ret;
projects / oweals / gnunet.git / blobdiff