Bastian Bloessl
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/*
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* Copyright (C) 2013 Bastian Bloessl <bloessl@ccs-labs.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ether_encap_impl.h"
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#include "ofdm_parse_mac_impl.h"
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#include <gnuradio/io_signature.h>
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#include <gnuradio/block_detail.h>
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#include <string>
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using namespace gr::ieee802_11;
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#define dout d_debug && std::cout
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ether_encap_impl::ether_encap_impl(bool debug) :
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block("ether_encap",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0)),
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d_debug(debug),
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d_last_seq(123) {
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message_port_register_out(pmt::mp("out"));
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message_port_register_in(pmt::mp("in"));
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set_msg_handler(pmt::mp("in"), boost::bind(ðer_encap_impl::parse, this, _1));
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}
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void
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ether_encap_impl::parse(pmt::pmt_t msg) {
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if(pmt::is_eof_object(msg)) {
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message_port_pub(pmt::mp("out"), pmt::PMT_EOF);
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detail().get()->set_done(true);
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return;
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}
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msg = pmt::cdr(msg);
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int data_len = pmt::blob_length(msg);
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const mac_header *mhdr = reinterpret_cast<const mac_header*>(pmt::blob_data(msg));
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if(d_last_seq == mhdr->seq_control) {
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dout << "Ether Encap: frame already seen -- skipping" << std::endl;
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return;
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}
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d_last_seq = mhdr->seq_control;
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if(data_len < 33) {
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dout << "Ether Encap: frame too short to parse (<33)" << std::endl;
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return;
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}
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ethernet_header *ehdr = reinterpret_cast<ethernet_header*>(buf);
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if(((mhdr->frame_control >> 2) & 3) != 2) {
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dout << "this is not a data frame -- ignoring" << std::endl;
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return;
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}
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memcpy(ehdr->dest, mhdr->addr1, 6);
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memcpy(ehdr->src, mhdr->addr2, 6);
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ehdr->type = 0x0008;
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char *frame = (char*)pmt::blob_data(msg);
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// DATA
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if((((mhdr->frame_control) >> 2) & 63) == 2) {
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memcpy(buf + sizeof(ethernet_header), frame + 32, data_len - 32);
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pmt::pmt_t payload = pmt::make_blob(buf, data_len - 32 + 14);
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message_port_pub(pmt::mp("out"), pmt::cons(pmt::PMT_NIL, payload));
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// QoS Data
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} else if((((mhdr->frame_control) >> 2) & 63) == 34) {
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memcpy(buf + sizeof(ethernet_header), frame + 34, data_len - 34);
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pmt::pmt_t payload = pmt::make_blob(buf, data_len - 34 + 14);
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message_port_pub(pmt::mp("out"), pmt::cons(pmt::PMT_NIL, payload));
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}
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}
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ether_encap::sptr
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ether_encap::make(bool debug) {
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return gnuradio::get_initial_sptr(new ether_encap_impl(debug));
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}
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