@Override
public void initialize(PcapIf pcapIf) {
packets = new ArrayList<JPacket>();
// extract source MAC from injection interface
byte[] srcMac;
try {
srcMac = pcapIf.getHardwareAddress();
} catch (IOException ioe) {
log.error("Error obtaining injection interface address: ", ioe);
return;
}
// extract a source IPv4 address from injection interface
byte[] srcIp = NetUtils.getLinkLocal6Addr(pcapIf);
if (srcIp == null) {
log.error("Failed to find a IPv6 link-local source address");
return;
}
// get a list of pcap files we'll use for injection
String[] pcapFiles = JNetPcapUtils.getPcapFilenames(PCAP_DIR);
// packet headers
Ethernet eth = new Ethernet();
Ip6 ip = new Ip6();
Icmp6 icmp = new Icmp6();
// load pcap files one-by-one
for (String pcapFile : pcapFiles) {
PcapPacket packet = JNetPcapUtils.pcapPacketFromFile(pcapFile);
if (packet == null) {
log.warn("No packet found in [{}]", pcapFile);
continue;
}
// validate packet
if (!packet.hasHeader(eth) || !packet.hasHeader(ip) || !packet.hasHeader(icmp)) {
log.error("Invalid packet type in [{}]", pcapFile);
continue;
}
// set the source MAC/IP in the packet
eth.source(srcMac);
ip.setByteArray(8, srcIp);
// set destination mac/ip
for (String[] dst : dstMacIps) {
eth.destination(NetUtils.getMacBytes(dst[0]));
ip.setByteArray(24, NetUtils.getAddressBytes(dst[1]));
// calculate checksums
eth.calculateChecksum();
icmp.calculateChecksum();
// make a deep copy of the packet and add it to the list
packets.add(new PcapPacket(packet));
}
}
}
