Fixed some bugs. Added a better dependency system for Makefiles.

src/ieee802_3.cpp

@@ -0,0 +1,146 @@
+/*
+ * libtins is a net packet wrapper library for crafting and
+ * interpreting sniffed packets.
+ *
+ * Copyright (C) 2011 Nasel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <cassert>
+#include <cstring>
+#include <stdexcept>
+#include <algorithm>
+#ifndef WIN32
+    #include <net/ethernet.h>
+    #include <netpacket/packet.h>
+#endif
+#include "ieee802_3.h"
+#include "llc.h"
+#include "utils.h"
+
+namespace Tins {
+const IEEE802_3::address_type IEEE802_3::BROADCAST("ff:ff:ff:ff:ff:ff");
+
+IEEE802_3::IEEE802_3(const NetworkInterface& iface, 
+  const address_type &dst_hw_addr, const address_type &src_hw_addr, 
+  PDU* child)
+: PDU(ETHERTYPE_IP, child) 
+{
+    memset(&_eth, 0, sizeof(ethhdr));
+    this->dst_addr(dst_hw_addr);
+    this->src_addr(src_hw_addr);
+    this->iface(iface);
+    this->_eth.length = 0;
+
+}
+
+IEEE802_3::IEEE802_3(const uint8_t *buffer, uint32_t total_sz) : PDU(ETHERTYPE_IP) {
+    if(total_sz < sizeof(ethhdr))
+        throw std::runtime_error("Not enough size for an ethernetII header in the buffer.");
+    memcpy(&_eth, buffer, sizeof(ethhdr));
+    PDU *next = 0;
+    buffer += sizeof(ethhdr);
+    total_sz -= sizeof(ethhdr);
+    if(total_sz) {
+    	next = new Tins::LLC(buffer, total_sz);
+        inner_pdu(next);
+    }
+}
+
+void IEEE802_3::dst_addr(const address_type &new_dst_mac) {
+    std::copy(new_dst_mac.begin(), new_dst_mac.end(), _eth.dst_mac);
+}
+
+void IEEE802_3::src_addr(const address_type &new_src_mac) {
+    std::copy(new_src_mac.begin(), new_src_mac.end(), _eth.src_mac);
+}
+
+void IEEE802_3::iface(const NetworkInterface &new_iface) {
+    _iface = new_iface;
+}
+
+void IEEE802_3::length(uint16_t new_length) {
+    this->_eth.length = Utils::net_to_host_s(new_length);
+}
+
+uint32_t IEEE802_3::header_size() const {
+    return sizeof(ethhdr);
+}
+
+bool IEEE802_3::send(PacketSender* sender) {
+    struct sockaddr_ll addr;
+
+    memset(&addr, 0, sizeof(struct sockaddr_ll));
+
+    addr.sll_family = Utils::net_to_host_s(PF_PACKET);
+    addr.sll_protocol = Utils::net_to_host_s(ETH_P_ALL);
+    addr.sll_halen = address_type::address_size;
+    addr.sll_ifindex = _iface.id();
+    memcpy(&(addr.sll_addr), _eth.dst_mac, sizeof(_eth.dst_mac));
+
+    return sender->send_l2(this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
+}
+
+bool IEEE802_3::matches_response(uint8_t *ptr, uint32_t total_sz) {
+    if(total_sz < sizeof(ethhdr))
+        return false;
+    ethhdr *eth_ptr = (ethhdr*)ptr;
+    if(!memcmp(eth_ptr->dst_mac, _eth.src_mac, sizeof(_eth.src_mac))) {
+        return true;
+    }
+    return false;
+}
+
+void IEEE802_3::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent) {
+    uint32_t my_sz = header_size();
+    bool set_length = _eth.length == 0;
+    assert(total_sz >= my_sz);
+
+    if (set_length)
+    	_eth.length = Utils::net_to_host_s(size() - sizeof(_eth));
+
+    memcpy(buffer, &_eth, sizeof(ethhdr));
+
+    if (set_length)
+    	_eth.length = 0;
+}
+
+PDU *IEEE802_3::recv_response(PacketSender *sender) {
+    struct sockaddr_ll addr;
+    memset(&addr, 0, sizeof(struct sockaddr_ll));
+
+    addr.sll_family = Utils::net_to_host_s(PF_PACKET);
+    addr.sll_protocol = Utils::net_to_host_s(ETH_P_802_3);
+    addr.sll_halen = address_type::address_size;
+    addr.sll_ifindex = _iface.id();
+    memcpy(&(addr.sll_addr), _eth.dst_mac, sizeof(_eth.dst_mac));
+
+    return sender->recv_l2(this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
+}
+
+PDU *IEEE802_3::clone_packet(const uint8_t *ptr, uint32_t total_sz) {
+    if(total_sz < sizeof(_eth))
+        return 0;
+    PDU *child = 0, *cloned;
+    if(total_sz > sizeof(_eth)) {
+        if((child = PDU::clone_inner_pdu(ptr + sizeof(_eth), total_sz - sizeof(_eth))) == 0)
+            return 0;
+    }
+    cloned = new IEEE802_3(ptr, std::min(total_sz, (uint32_t)sizeof(_eth)));
+    cloned->inner_pdu(child);
+    return cloned;
+}
+}