+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.abs_value_us = 0;
+ 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, but with '(' and ')' instead of '[' and ']' (RFC2396 advises against using square brackets in URIs):
+ * (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/0430205UC7D56PTQK8NV05776671CNN44FK4TL6D0GQ35OMF8MEN4RNMKA5UF6AL3DQO8B1SC5AQF50SQ2MABIRU4HC8H2HAJKJ59JL1JVRJAK308F9GASRFLMGUBB5TQ5AKR94AS5T3MDG8B9O1EMPRKB0HVCG7T6QPP4CDJ913LAEHVJ2DI1TOBB15Q1JIT5ARBOD12U4SIGRFDV3Q7T66G4TBVSJJ90UQF1BG29TGJJKLGEIMSPHHKO544D6EALQ4F2K0416311JC22GVAD48R616I7VK03K7MP7N0RS2MBV1TE9JV8CK1LSQMR7KCDRTLDA6917UGA67DHTGHERIACCGQ54TGSR48RMSGS9BA5HLMOKASFC1I6V4TT09TUGCU8GNDHQF0JF3H7LPV59UL5I38QID040G000!20120302010059!TCP!192.168.0.1:2086!TCP!64.23.8.174:0
+ * gnunet://hello/0430205UC7D56PTQK8NV05776671CNN44FK4TL6D0GQ35OMF8MEN4RNMKA5UF6AL3DQO8B1SC5AQF50SQ2MABIRU4HC8H2HAJKJ59JL1JVRJAK308F9GASRFLMGUBB5TQ5AKR94AS5T3MDG8B9O1EMPRKB0HVCG7T6QPP4CDJ913LAEHVJ2DI1TOBB15Q1JIT5ARBOD12U4SIGRFDV3Q7T66G4TBVSJJ90UQF1BG29TGJJKLGEIMSPHHKO544D6EALQ4F2K0416311JC22GVAD48R616I7VK03K7MP7N0RS2MBV1TE9JV8CK1LSQMR7KCDRTLDA6917UGA67DHTGHERIACCGQ54TGSR48RMSGS9BA5HLMOKASFC1I6V4TT09TUGCU8GNDHQF0JF3H7LPV59UL5I38QID040G000!20120302010059!TCP!(2001:db8:85a3:8d3:1319:8a2e:370:7348):2086
+ *
+ * <p>
+ */
+
+
+/* ************************* Compose HELLO URI ************************** */
+
+
+/**
+ * Replace all characters in the input 'in' according
+ * to the mapping. The mapping says to map each character
+ * in 'oldchars' to the corresponding character (by offset)
+ * in 'newchars'.
+ *
+ * @param in input string to remap
+ * @param oldchars characters to replace
+ * @param newchars replacement characters, must have same length as 'oldchars'
+ * @return copy of string with replacement applied.
+ */
+static char *
+map_characters (const char *in,
+ const char *oldchars,
+ const char *newchars)
+{
+ char *ret;
+ const char *off;
+ size_t i;
+
+ GNUNET_assert (strlen (oldchars) == strlen (newchars));
+ ret = GNUNET_strdup (in);
+ i = 0;
+ while (ret[i] != '\0')
+ {
+ off = strchr (oldchars, ret[i]);
+ if (NULL != off)
+ ret[i] = newchars[off - oldchars];
+ i++;
+ }
+ return ret;
+}
+
+
+/**
+ * Function that is called on each address of this peer.
+ * Expands the corresponding URI string.
+ *
+ * @param cls the 'GNUNET_HELLO_GetUriContext'
+ * @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 *uri_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 (papi == NULL)
+ {
+ /* 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 ( (addr == NULL) || (strlen(addr) == 0) )
+ return GNUNET_OK;
+
+ addr_dup = GNUNET_strdup (addr);
+ if (NULL != (pos = strstr (addr_dup, "_server")))
+ memcpy (pos, client_str, strlen(client_str)); /* Replace all server addresses with client addresses */
+
+ /* For URIs we use '(' and ')' instead of '[' and ']' as brackets are reserved
+ characters in URIs */
+ uri_addr = map_characters (addr_dup, "[]", "()");
+ GNUNET_free (addr_dup);
+ seconds = expiration.abs_value_us / 1000LL / 1000LL;
+ t = gmtime (&seconds);
+
+ GNUNET_asprintf (&ret,
+ "%s!%s!%s!%s",
+ ctx->uri,
+ strftime (tbuf, sizeof (tbuf), "%Y%m%d%H%M%S", t) ? tbuf : "0",
+ address->transport_name,
+ uri_addr);
+ GNUNET_free (uri_addr);
+ 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;
+ ctx.plugins_find = plugins_find;
+
+ char *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_AddressParsingContext'
+ * @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
+ */
+static size_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;
+ char *plugin_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;
+ size_t ret;
+
+ if (NULL == ctx->pos)
+ return 0;
+ if ('!' != ctx->pos[0])
+ {
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return 0;
+ }
+ ctx->pos++;
+
+ if ('0' == ctx->pos[0] && '!' == 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 0;
+ }
+
+ 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 0;
+ }
+ expire.abs_value_us = expiration_seconds * 1000LL * 1000LL;
+ }
+ if ('!' != tname[0])
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse HELLO message: malformed\n"));
+ ctx->ret = GNUNET_SYSERR;
+ GNUNET_break (0);
+ return 0;
+ }
+ tname++;
+ address = strchr (tname, (int) '!');
+ 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 0;
+ }
+ address++;
+ end = strchr (address, (int) '!');
+ ctx->pos = end;
+ 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_ERROR,
+ _("Plugin `%s' not found\n"),
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_break (0);
+ return 0;
+ }
+ if (NULL == papi->string_to_address)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("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);
+ /* For URIs we use '(' and ')' instead of '[' and ']' as brackets are reserved
+ characters in URIs; need to convert back to '[]' for the plugin */
+ plugin_address = map_characters (uri_address, "()", "[]");
+ GNUNET_free (uri_address);
+ if (GNUNET_OK !=
+ papi->string_to_address (papi->cls,
+ plugin_address,
+ strlen (plugin_address) + 1,
+ &addr,
+ &addr_len))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to parse `%s' as an address for plugin `%s'\n"),
+ plugin_address,
+ plugin_name);
+ GNUNET_free (plugin_name);
+ GNUNET_free (plugin_address);
+ return 0;
+ }
+ GNUNET_free (plugin_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);
+ 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 = strstr (pks, "!");
+
+ 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.plugins_find = plugins_find;
+ *hello = GNUNET_HELLO_create (pubkey, &add_address_to_hello, &ctx, friend_only);
+
+ return ctx.ret;
+}
+
+
projects / oweals / gnunet.git / blobdiff