4 * The secure anycast tunneling protocol (satp) defines a protocol used
5 * for communication between any combination of unicast and anycast
6 * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
7 * mode and allows tunneling of every ETHER TYPE protocol (e.g.
8 * ethernet, ip, arp ...). satp directly includes cryptography and
9 * message authentication based on the methodes used by SRTP. It is
10 * intended to deliver a generic, scaleable and secure solution for
11 * tunneling and relaying of packets of any protocol.
14 * Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl,
15 * Christian Pointner <satp@wirdorange.org>
17 * This file is part of Anytun.
19 * Anytun is free software: you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License version 3 as
21 * published by the Free Software Foundation.
23 * Anytun is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with anytun. If not, see <http://www.gnu.org/licenses/>.
34 #include "datatypes.h"
36 #include "plainPacket.h"
37 #include "anytunError.h"
39 PlainPacket::PlainPacket(u_int32_t payload_length, bool allow_realloc) : Buffer(payload_length + sizeof(payload_type_t), allow_realloc)
41 payload_type_ = reinterpret_cast<payload_type_t*>(buf_);
42 payload_ = buf_ + sizeof(payload_type_t);
46 u_int32_t PlainPacket::getHeaderLength()
48 return sizeof(payload_type_t);
51 payload_type_t PlainPacket::getPayloadType() const
54 return PAYLOAD_TYPE_T_NTOH(*payload_type_);
59 void PlainPacket::setPayloadType(payload_type_t payload_type)
64 if(payload_type == PAYLOAD_TYPE_TUN) {
66 *payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN);
70 char * ip_version_ptr = reinterpret_cast<char *>(payload_);
71 char ip_version = ip_version_ptr[0];
74 *payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN4);
75 else if(ip_version == 6)
76 *payload_type_ = PAYLOAD_TYPE_T_HTON(PAYLOAD_TYPE_TUN6);
79 *payload_type_ = PAYLOAD_TYPE_T_HTON(payload_type);
82 u_int32_t PlainPacket::getPayloadLength() const
87 return (length_ > sizeof(payload_type_t)) ? (length_ - sizeof(payload_type_t)) : 0;
90 void PlainPacket::setPayloadLength(u_int32_t payload_length)
92 Buffer::setLength(payload_length + sizeof(payload_type_t));
93 // depending on allow_realloc buf_ may point to another address
94 // therefore in this case reinit() gets called by Buffer::setLength()
97 void PlainPacket::reinit()
99 payload_type_ = reinterpret_cast<payload_type_t*>(buf_);
100 payload_ = buf_ + sizeof(payload_type_t);
102 if(length_ <= (sizeof(payload_type_t)))
105 if(length_ < (sizeof(payload_type_t))) {
106 payload_type_ = NULL;
107 AnytunError::throwErr() << "plain packet can't be initialized, buffer is too small";
112 u_int8_t* PlainPacket::getPayload()
118 NetworkAddress PlainPacket::getSrcAddr() const
120 if(!payload_type_ || !payload_)
121 return NetworkAddress();
123 payload_type_t type = PAYLOAD_TYPE_T_NTOH(*payload_type_);
125 if(type == PAYLOAD_TYPE_TAP) // Ehternet
128 return NetworkAddress();
130 else if(type == PAYLOAD_TYPE_TUN4) // IPv4
132 if(length_ < (sizeof(payload_type_t)+sizeof(struct ip)))
133 return NetworkAddress();
134 struct ip* hdr = reinterpret_cast<struct ip*>(payload_);
135 return NetworkAddress(hdr->ip_src);
137 else if(type == PAYLOAD_TYPE_TUN6) // IPv6
139 if(length_ < (sizeof(payload_type_t)+sizeof(struct ip6_hdr)))
140 return NetworkAddress();
141 struct ip6_hdr* hdr = reinterpret_cast<struct ip6_hdr*>(payload_);
142 return NetworkAddress(hdr->ip6_src);
144 return NetworkAddress();
147 NetworkAddress PlainPacket::getDstAddr() const
149 if(!payload_type_ || !payload_)
150 return NetworkAddress();
152 payload_type_t type = PAYLOAD_TYPE_T_NTOH(*payload_type_);
154 if(type == PAYLOAD_TYPE_TAP) // Ehternet
157 return NetworkAddress();
159 else if(type == PAYLOAD_TYPE_TUN4) // IPv4
161 if(length_ < (sizeof(payload_type_t)+5*4))
162 return NetworkAddress();
163 char * hdr = reinterpret_cast<char *>(payload_);
164 boost::asio::ip::address_v4::bytes_type ip_octets;
165 for (int i=0; i<4;i++)
166 ip_octets[i]=hdr[4*4+i];
167 return NetworkAddress(boost::asio::ip::address_v4(ip_octets));
169 else if(type == PAYLOAD_TYPE_TUN6) // IPv6
171 if(length_ < (sizeof(payload_type_t)+2*16+2*4))
172 return NetworkAddress();
173 char * hdr = reinterpret_cast<char *>(payload_);
174 boost::asio::ip::address_v6::bytes_type ip_octets;
175 for (int i=0; i<16;i++)
176 ip_octets[i]=hdr[2*4+16+i];
177 return NetworkAddress(boost::asio::ip::address_v6(ip_octets));
179 return NetworkAddress();