Merge branch 'master' of gnunet.org:gnunet

[oweals/gnunet.git] / src / include / gnunet_tun_lib.h

diff --git a/src/include/gnunet_tun_lib.h b/src/include/gnunet_tun_lib.h
index efadc4d14789a5fa2bc9cb19673a81afb3c41a9b..11c43e8b74b80b6ad21461d4f5c94b31c18e2e7a 100644 (file)
--- a/src/include/gnunet_tun_lib.h
+++ b/src/include/gnunet_tun_lib.h
@@ -1,33 +1,39 @@
 /*
      This file is part of GNUnet.
-     (C) 2010-2013 Christian Grothoff
+     Copyright (C) 2010-2013 Christian Grothoff
 
-     GNUnet is free software; you can redistribute it and/or modify
-     it under the terms of the GNU General Public License as published
-     by the Free Software Foundation; either version 3, or (at your
-     option) any later version.
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
 
      GNUnet is distributed in the hope that it will be useful, but
      WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-     General Public License for more details.
+     Affero General Public License for more details.
+    
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-     You should have received a copy of the GNU General Public License
-     along with GNUnet; see the file COPYING.  If not, write to the
-     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-     Boston, MA 02111-1307, USA.
+     SPDX-License-Identifier: AGPL3.0-or-later
 */
 
 /**
- * @file include/gnunet_tun_lib.h
- * @brief standard TCP/IP network structs and IP checksum calculations for TUN interaction
  * @author Philipp Toelke
  * @author Christian Grothoff
+ *
+ * @file
+ * Standard TCP/IP network structs and IP checksum calculations for TUN interaction
+ *
+ * @defgroup tun  TUN library
+ * Standard TCP/IP network structs and IP checksum calculations for TUN interaction
+ * @{
  */
 #ifndef GNUNET_TUN_LIB_H
 #define GNUNET_TUN_LIB_H
 
-#include "gnunet_util_lib.h"
+#include "gnunet_common.h"
+#include "gnunet_crypto_lib.h"
 
 
 /* see http://www.iana.org/assignments/ethernet-numbers */
@@ -52,6 +58,7 @@
  * 8 bytes for IPv4, 4 bytes for port, 1 byte for "4", 2 bytes for "-",
  * one byte for 0-termination.
  */
+
 #define GNUNET_TUN_IPV4_REGEXLEN 16
 
 
@@ -184,6 +191,18 @@ struct GNUNET_TUN_IPv6Header
 } GNUNET_GCC_STRUCT_LAYOUT;
 
 
+/**
+ * TCP flags.
+ */
+#define GNUNET_TUN_TCP_FLAGS_FIN 1
+#define GNUNET_TUN_TCP_FLAGS_SYN 2
+#define GNUNET_TUN_TCP_FLAGS_RST 4
+#define GNUNET_TUN_TCP_FLAGS_PSH 8
+#define GNUNET_TUN_TCP_FLAGS_ACK 16
+#define GNUNET_TUN_TCP_FLAGS_URG 32
+#define GNUNET_TUN_TCP_FLAGS_ECE 64
+#define GNUNET_TUN_TCP_FLAGS_CWR 128
+
 /**
  * TCP packet header.
  */
@@ -529,6 +548,31 @@ struct GNUNET_TUN_DnsSrvRecord
 };
 
 
+/**
+ * Payload of DNS CERT record.
+ */
+struct GNUNET_TUN_DnsCertRecord
+{
+
+  /**
+   * Certificate type
+   */
+  uint16_t cert_type;
+
+  /**
+   * Certificate KeyTag
+   */
+  uint16_t cert_tag;
+
+  /**
+   * Algorithm
+   */
+  uint8_t algorithm;
+
+  /* Followed by the certificate */
+};
+
+
 /**
  * Payload of DNSSEC TLSA record.
  * http://datatracker.ietf.org/doc/draft-ietf-dane-protocol/
@@ -594,6 +638,7 @@ struct GNUNET_TUN_GnsVpnRecord
   /* followed by the servicename */
 };
 
+
 /**
  * DNS query prefix.
  */
@@ -658,16 +703,19 @@ struct GNUNET_TUN_DnsRecordLine
 /**
  * ICMP header.
  */
-struct GNUNET_TUN_IcmpHeader {
+struct GNUNET_TUN_IcmpHeader
+{
   uint8_t type;
   uint8_t code;
   uint16_t crc GNUNET_PACKED;
 
-  union {
+  union
+  {
     /**
      * ICMP Echo (request/reply)
      */
-    struct {
+    struct
+    {
       uint16_t identifier GNUNET_PACKED;
       uint16_t sequence_number GNUNET_PACKED;
     } echo;
@@ -675,7 +723,8 @@ struct GNUNET_TUN_IcmpHeader {
     /**
      * ICMP Destination Unreachable (RFC 1191)
      */
-    struct ih_pmtu {
+    struct ih_pmtu
+    {
       uint16_t empty GNUNET_PACKED;
       uint16_t next_hop_mtu GNUNET_PACKED;
       /* followed by original IP header + first 8 bytes of original IP datagram */
@@ -857,4 +906,47 @@ char *
 GNUNET_TUN_ipv4policy2regex (const char *policy);
 
 
+/**
+ * Hash the service name of a hosted service to the
+ * hash code that is used to identify the service on
+ * the network.
+ *
+ * @param service_name a string
+ * @param[out] hc corresponding hash
+ */
+void
+GNUNET_TUN_service_name_to_hash (const char *service_name,
+                                 struct GNUNET_HashCode *hc);
+
+
+/**
+ * Check if two sockaddrs are equal.
+ *
+ * @param sa one address
+ * @param sb another address
+ * @param include_port also check ports
+ * @return #GNUNET_YES if they are equal
+ */
+int
+GNUNET_TUN_sockaddr_cmp (const struct sockaddr *sa,
+                         const struct sockaddr *sb,
+                         int include_port);
+
+
+/**
+ * Compute the CADET port given a service descriptor
+ * (returned from #GNUNET_TUN_service_name_to_hash) and
+ * a TCP/UDP port @a ip_port.
+ *
+ * @param desc service shared secret
+ * @param ip_port TCP/UDP port, use 0 for ICMP
+ * @param[out] cadet_port CADET port to use
+ */
+void
+GNUNET_TUN_compute_service_cadet_port (const struct GNUNET_HashCode *desc,
+                                       uint16_t ip_port,
+                                       struct GNUNET_HashCode *cadet_port);
+
 #endif
+
+/** @} */  /* end of group */