+
+
+/**
+ * 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;
+ return GNUNET_OK;
+}
+
+
+/**
+ * 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)
+{
+ struct GNUNET_HELLO_ComposeUriContext ctx;
+ char *pkey;
+
+ ctx.plugins_find = plugins_find;
+ pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&hello->publicKey);
+ GNUNET_asprintf (&ctx.uri,
+ "%s%s",
+ (GNUNET_YES == GNUNET_HELLO_is_friend_only (hello))
+ ? GNUNET_FRIEND_HELLO_URI_PREFIX
+ : GNUNET_HELLO_URI_PREFIX,
+ pkey);
+ GNUNET_free (pkey);
+ GNUNET_HELLO_iterate_addresses (hello,
+ GNUNET_NO,
+ &add_address_to_uri,
+ &ctx);
+ return ctx.uri;
+}
+
+
+/* ************************* Parse HELLO URI ********************* */
+
+
+/**
+ * We're building a HELLO. Parse the next address from the
+ * parsing context and append it.
+ *
+ * @param cls the `struct GNUNET_HELLO_ParseUriContext`
+ * @param max number of bytes available for HELLO construction
+ * @param buffer where to copy the next address (in binary format)
+ * @return number of bytes added to buffer, #GNUNET_SYSERR on error
+ */
+static ssize_t
+add_address_to_hello (void *cls,
+ size_t max,
+ void *buffer)
+{
+ struct GNUNET_HELLO_ParseUriContext *ctx = cls;
+ const char *tname;
+ const char *address;
+ char *uri_address;
+ const char *end;
+ char *plugin_name;
+ struct tm expiration_time;
+ time_t expiration_seconds;
+ struct GNUNET_TIME_Absolute expire;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ void *addr;
+ size_t addr_len;
+ struct GNUNET_HELLO_Address haddr;
+ ssize_t ret;
+
+ if (NULL == ctx->pos)
+ return GNUNET_SYSERR;
+ if (GNUNET_HELLO_URI_SEP != ctx->pos[0])
+ {
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ ctx->pos++;
+
+ if ( ('0' == ctx->pos[0]) &&
+ (GNUNET_HELLO_URI_SEP == ctx->pos[1]) )
+ {
+ expire = GNUNET_TIME_UNIT_FOREVER_ABS;
+ tname = ctx->pos + 1;
+ }
+ else
+ {
+ memset (&expiration_time, 0, sizeof (expiration_time));
+ tname = strptime (ctx->pos,
+ "%Y%m%d%H%M%S",
+ &expiration_time);
+ if (NULL == tname)
+ {
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: missing expiration time\n"));
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ expiration_seconds = mktime (&expiration_time);
+ if (expiration_seconds == (time_t) -1)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: invalid expiration time\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ expire.abs_value_us = expiration_seconds * 1000LL * 1000LL;
+ }
+ if (GNUNET_HELLO_URI_SEP != tname[0])
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: malformed\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ tname++;
+ address = strchr (tname,
+ (int) GNUNET_HELLO_URI_SEP);
+ if (NULL == address)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: missing transport plugin\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ address++;
+ end = strchr (address, (int) GNUNET_HELLO_URI_SEP);
+ ctx->pos = end;
+ ctx->counter_total ++;
+ plugin_name = GNUNET_strndup (tname, address - (tname+1));
+ papi = ctx->plugins_find (plugin_name);
+ if (NULL == papi)
+ {
+ /* Not an error - we might just not have the right plugin.
+ * Skip this part, advance to the next one and recurse.
+ * But only if this is not the end of string.
+ */
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("Plugin `%s' not found, skipping address\n"),
+ plugin_name);
+ GNUNET_free (plugin_name);
+ return 0;
+ }
+ if (NULL == papi->string_to_address)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("Plugin `%s' does not support URIs yet\n"),
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_break (0);
+ return 0;
+ }
+ uri_address = GNUNET_strndup (address, end - address);
+ if (GNUNET_OK !=
+ papi->string_to_address (papi->cls,
+ uri_address,
+ strlen (uri_address) + 1,
+ &addr,
+ &addr_len))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse `%s' as an address for plugin `%s'\n"),
+ uri_address,
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_free (uri_address);
+ return 0;
+ }
+ GNUNET_free (uri_address);
+ /* address.peer is unset - not used by add_address() */
+ haddr.address_length = addr_len;
+ haddr.address = addr;
+ haddr.transport_name = plugin_name;
+ ret = GNUNET_HELLO_add_address (&haddr,
+ expire,
+ buffer,
+ max);
+ ctx->counter_added ++;
+ GNUNET_free (addr);
+ GNUNET_free (plugin_name);
+ return ret;
+}
+
+
+/**
+ * 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)
+{
+ const char *pks;
+ const char *exc;
+ int friend_only;
+ struct GNUNET_HELLO_ParseUriContext ctx;
+
+ if (0 == strncmp (uri,
+ GNUNET_HELLO_URI_PREFIX,
+ strlen (GNUNET_HELLO_URI_PREFIX)))
+ {
+ pks = &uri[strlen (GNUNET_HELLO_URI_PREFIX)];
+ friend_only = GNUNET_NO;
+ }
+ else if (0 == strncmp (uri,
+ GNUNET_FRIEND_HELLO_URI_PREFIX,
+ strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)))
+ {
+ pks = &uri[strlen (GNUNET_FRIEND_HELLO_URI_PREFIX)];
+ friend_only = GNUNET_YES;
+ }
+ else
+ return GNUNET_SYSERR;
+ exc = strchr (pks, GNUNET_HELLO_URI_SEP);
+
+ if (GNUNET_OK !=
+ GNUNET_STRINGS_string_to_data (pks,
+ (NULL == exc) ? strlen (pks) : (exc - pks),
+ (unsigned char *) pubkey,
+ sizeof (*pubkey)))
+ return GNUNET_SYSERR;
+
+ ctx.pos = exc;
+ ctx.ret = GNUNET_OK;
+ ctx.counter_total = 0;
+ ctx.counter_added = 0;
+ ctx.plugins_find = plugins_find;
+ *hello = GNUNET_HELLO_create (pubkey,
+ &add_address_to_hello,
+ &ctx,
+ friend_only);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "HELLO URI contained %u addresses, added %u addresses\n",
+ ctx.counter_total,
+ ctx.counter_added);
+
+ return ctx.ret;
+}
+
+