int pingPong(PacketSender& ps, int adr)
{
PingPacket ping(0, adr);
verbose("PING(%d)...", adr);
do {
ps.SendPacketVal(ping);
} while (!ps.ReceivePacket());
info("PONG from %d\n", adr);
return 1;
}
void Dot11::send(PacketSender &sender, const NetworkInterface &iface) {
if(!iface)
throw invalid_interface();
#if !defined(BSD) && !defined(__FreeBSD_kernel__)
sockaddr_ll addr;
memset(&addr, 0, sizeof(struct sockaddr_ll));
addr.sll_family = Endian::host_to_be<uint16_t>(PF_PACKET);
addr.sll_protocol = Endian::host_to_be<uint16_t>(ETH_P_ALL);
addr.sll_halen = 6;
addr.sll_ifindex = iface.id();
memcpy(&(addr.sll_addr), _header.addr1, 6);
sender.send_l2(*this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
#else
sender.send_l2(*this, 0, 0, iface);
#endif
}
void IPv6::send(PacketSender& sender, const NetworkInterface &) {
struct sockaddr_in6 link_addr;
PacketSender::SocketType type = PacketSender::IPV6_SOCKET;
link_addr.sin6_family = AF_INET6;
link_addr.sin6_port = 0;
copy(header_.dst_addr, header_.dst_addr + address_type::address_size, (uint8_t*)&link_addr.sin6_addr);
if (inner_pdu() && inner_pdu()->pdu_type() == PDU::ICMP) {
type = PacketSender::ICMP_SOCKET;
}
sender.send_l3(*this, (struct sockaddr*)&link_addr, sizeof(link_addr), type);
}
int main(int argc, char *argv[])
{
if(argc != 2) {
std::cout << "Usage: " << *argv << " <interface>" << std::endl;
return 1;
}
// Sniff on the provided interface, maximum packet size 2000
// in promiscuos mode and only udp packets sent to port 53
Sniffer sniffer(argv[1], 2000, true, "udp and dst port 53");
// All packets will be sent through the provided interface
sender.default_interface(argv[1]);
sniffer.sniff_loop(callback);
}
void send_packets(PacketSender &sender) {
// ICMPs are icmp-requests by default
IP ip = IP(addr, iface.addresses().ip_addr) / ICMP();
// We'll find at most 10 hops.
for(auto i = 1; i <= 10; ++i) {
// Set this "unique" id
ip.id(i);
// Set the time-to-live option
ip.ttl(i);
// Critical section
{
std::lock_guard<std::mutex> _(lock);
ttls[i] = i;
}
sender.send(ip);
// Give him a little time
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
running = false;
sender.send(ip);
}
void EthernetII::send(PacketSender &sender, const NetworkInterface &iface) {
if(!iface)
throw invalid_interface();
#if defined(HAVE_PACKET_SENDER_PCAP_SENDPACKET) || defined(BSD) || defined(__FreeBSD_kernel__)
// Sending using pcap_sendpacket/BSD bpf packet mode is the same here
sender.send_l2(*this, 0, 0, iface);
#elif defined(WIN32)
// On Windows we can only send l2 PDUs using pcap_sendpacket
throw std::runtime_error("LIBTINS_USE_PCAP_SENDPACKET is not enabled");
#else
// Default GNU/Linux behaviour
struct sockaddr_ll addr;
memset(&addr, 0, sizeof(struct sockaddr_ll));
addr.sll_family = Endian::host_to_be<uint16_t>(PF_PACKET);
addr.sll_protocol = Endian::host_to_be<uint16_t>(ETH_P_ALL);
addr.sll_halen = address_type::address_size;
addr.sll_ifindex = iface.id();
memcpy(&(addr.sll_addr), _eth.dst_mac, address_type::address_size);
sender.send_l2(*this, (struct sockaddr*)&addr, (uint32_t)sizeof(addr));
#endif
}
bool callback(const PDU &pdu)
{
// The packet probably looks like this:
//
// EthernetII / IP / UDP / RawPDU
//
// So we retrieve each layer, and construct a
// DNS PDU from the RawPDU layer contents.
EthernetII eth = pdu.rfind_pdu<EthernetII>();
IP ip = eth.rfind_pdu<IP>();
UDP udp = ip.rfind_pdu<UDP>();
DNS dns = udp.rfind_pdu<RawPDU>().to<DNS>();
// Is it a DNS query?
if(dns.type() == DNS::QUERY) {
// Let's see if there's any query for an "A" record.
for(const auto &query : dns.queries()) {
if(query.type() == DNS::A) {
// Here's one! Let's add an answer.
dns.add_answer(
DNS::Resource(
query.dname(),
"127.0.0.1",
DNS::A,
query.query_class(),
// 777 is just a random TTL
777
)
);
}
}
// Have we added some answers?
if(dns.answers_count() > 0) {
// It's a response now
dns.type(DNS::RESPONSE);
// Recursion is available(just in case)
dns.recursion_available(1);
// Build our packet
auto pkt = EthernetII(eth.src_addr(), eth.dst_addr()) /
IP(ip.src_addr(), ip.dst_addr()) /
UDP(udp.sport(), udp.dport()) /
dns;
// Send it!
sender.send(pkt);
}
}
return true;
}
//-------------------------------------------------------------------------------------
Reason PacketFilter::send(Channel * pChannel, PacketSender& sender, Packet * pPacket)
{
return sender.processFilterPacket(pChannel, pPacket);
}
void sendFile(const char* fileName, PacketSender& packetSender, int studentNo)
{
static const char progressChar[] = "...--oo*OO0";
uint8_t Sector[SECTORSIZE];
FILE* infile;
struct stat stat_p;
int sectNo = 0;
// check the size of file
stat(fileName, &stat_p);
infile = fopen(fileName, "rb");
if (infile == 0) {
eggog("Error: cannot open %s\n", fileName);
}
info("Sending file %s to workstation %d\n", fileName, studentNo);
// Send ping
if (!pingPong(packetSender, studentNo)) eggog("No reply from workstation %d\n", studentNo);
// Create file on the net disk
{
NetCreateFilePacket createFile(0, studentNo, fileName);
packetSender.SendPacketVal(createFile);
if (!packetSender.ReceivePacket()) {
eggog("No ack of create file from %d\n", studentNo);
}
}
verbose("\nGot re: NET_CREATE_FILE.\n");
// Reading the file sector-by-sector and writing them onto the net disk
info("\nNumber of sectors to send: %zd\n",
(size_t) ((stat_p.st_size / sizeof (Sector)) + (stat_p.st_size % sizeof (Sector))));
while (!feof(infile))
{
if (fread(Sector, sizeof(Sector), 1, infile) == 0) break;
{
NetMasterDataPacket data(0, studentNo, Sector, SECTORSIZE);
packetSender.SendPacketVal(data);
NetWriteFilePacket writeFile(0, studentNo, packetSender.GetNetFCB());
packetSender.SendPacketVal(writeFile);
if (!packetSender.ReceivePacket()) {
eggog("No ack of file write from %d\n", studentNo);
}
}
verbose("\nSent sector No.%d", sectNo);
if ((sectNo+1) % 10 == 0) {
info("%3d%c", sectNo+1, ((sectNo+1) % 100 == 0) ? '\n' : ' ');
}
else {
info("%c\010", progressChar[sectNo % 10]);
}
sectNo++;
}
// close the file on the net disk
{
NetCloseFilePacket closeFile(0, studentNo, packetSender.GetNetFCB());
packetSender.SendPacketVal(closeFile);
if (!packetSender.ReceivePacket()) {
eggog("No ack of file close from %d\n", studentNo);
}
}
info("\nSendFile Done.\n");
}
