private void ev_destination_unreachable(easy_socket.icmp.icmp_destination_unreachable sender, easy_socket.icmp.EventArgs_ipv4header_ReceiveData e)
{
if (!this.check_if_one_of_our_packets(sender.ih_and_original_dd))
{
return;
}
easy_socket.ip_header.ipv4_header initial_iph = new easy_socket.ip_header.ipv4_header();
initial_iph.decode(sender.ih_and_original_dd);// may return the error error_datagram_not_complete but decode at least ip header
this.textBox_telnet_add("Icmp destination unreachable from: " +
e.ipv4header.SourceAddress +
" for destination: " + initial_iph.DestinationAddress + "\r\n");
// we stop
this.allow_user_interface(true);
this.icmp_server.stop();
}
private void ev_destination_unreachable(easy_socket.icmp.icmp_destination_unreachable sender, easy_socket.icmp.EventArgs_ipv4header_ReceiveData e)
{
if (!this.check_if_one_of_our_packets(sender.ih_and_original_dd))
{
return;
}
easy_socket.ip_header.ipv4_header initial_iph = new easy_socket.ip_header.ipv4_header();
initial_iph.decode(sender.ih_and_original_dd);// may return the error error_datagram_not_complete but decode at least ip header
this.textBox_telnet_add("Icmp destination unreachable from: " +
e.ipv4header.SourceAddress +
" for destination: " + initial_iph.DestinationAddress + "\r\n");
// in case of broadcast wait time out before sending another ping
if (!this.checkBox_may_broadcast.Checked)
{
this.send_if_necessary();
}
}
protected bool check_if_one_of_our_packets(byte[] data)
{
easy_socket.ip_header.ipv4_header iph = new easy_socket.ip_header.ipv4_header();
/*
* error_success=0;
* error_datagram_null=1;
* error_datagram_internet_header_length_too_small=2;
* error_datagram_total_length_too_small=3;
* error_datagram_not_complete=4;
*/
byte b = iph.decode(data);
if ((b == easy_socket.ip_header.ipv4_header.error_datagram_null) ||
(b == easy_socket.ip_header.ipv4_header.error_datagram_internet_header_length_too_small) ||
(b == easy_socket.ip_header.ipv4_header.error_datagram_total_length_too_small))
{
return(false);
}
if (iph.protocol != easy_socket.ip_header.ipv4_header.protocol_icmp)
{
return(false);
}
// error_success || error_datagram_not_complete
if (iph.data == null)
{
return(false);
}
if (iph.data.Length < 8) // 8=icmp_echo header size
{
return(false);
}
if (iph.data[0] != 8) // it's not a reply to an echo msg
{
return(false);
}
easy_socket.icmp.icmp_echo ie = new easy_socket.icmp.icmp_echo();
ie.decode(iph.data);
int id = (ie.identifier << 16) + ie.sequence_number;
return(this.check_identifier(id));
}
private void ev_time_exceeded(easy_socket.icmp.icmp_time_exceeded_message sender, easy_socket.icmp.EventArgs_ipv4header_ReceiveData e)
{
if (!this.check_if_one_of_our_packets(sender.ih_and_original_dd))
{
return;
}
easy_socket.ip_header.ipv4_header initial_iph = new easy_socket.ip_header.ipv4_header();
initial_iph.decode(sender.ih_and_original_dd);// may return the error error_datagram_not_complete but try to decode at least ip header
this.textBox_telnet_add("Icmp time exceeded message from: " + e.ipv4header.SourceAddress + " for ip: " +
initial_iph.DestinationAddress +
" (packet ttl: " +
initial_iph.time_to_live.ToString()
+ ")\r\n");
// in case of broadcast wait time out before sending another ping
if (!this.checkBox_may_broadcast.Checked)
{
this.send_if_necessary();
}
}
private void ev_time_exceeded(easy_socket.icmp.icmp_time_exceeded_message sender, easy_socket.icmp.EventArgs_ipv4header_ReceiveData e)
{
if (!this.check_if_one_of_our_packets(sender.ih_and_original_dd))
{
return;
}
this.icmp_server.clear_wait_timeout();
easy_socket.ip_header.ipv4_header initial_iph = new easy_socket.ip_header.ipv4_header();
initial_iph.decode(sender.ih_and_original_dd);// may return the error error_datagram_not_complete but try to decode at least ip header
this.textBox_telnet_add("Icmp time exceeded message from: " + e.ipv4header.SourceAddress + " for ip: " +
initial_iph.DestinationAddress +
" (packet ttl: " +
initial_iph.time_to_live.ToString()
+ ")\r\n");
this.textBox_telnet_add("Initial TTL:" + (this.b_current_hop - 1) + "\r\n");//this.b_current_hop has already been increased
if (this.checkBox_icmp_resolve_adresses.Checked)
{
this.dns_resolve(e.ipv4header.SourceAddress);
}
this.send_if_necessary();
}
/// <summary>
/// used to get original datagram info on icmp troubles msg. the icmp msg should contain internet header and 64 bits of original datagram
/// </summary>
/// <param name="raw_databool"></param>
/// <param name="b_most_important_info_only"></param>
/// <returns></returns>
private static string decode_internet_header_and_64_bits_of_original_datagram(byte[] raw_data, bool b_most_important_info_only)
{
if (raw_data == null)
{
return("");
}
string ret = "";
byte ret_decode;
// decode
easy_socket.ip_header.ipv4_header ipv4h = new easy_socket.ip_header.ipv4_header();
ret_decode = ipv4h.decode(raw_data);
if ((ret_decode != easy_socket.ip_header.ipv4_header.error_success) && (ret_decode != easy_socket.ip_header.ipv4_header.error_datagram_not_complete) && (ret_decode != easy_socket.ip_header.ipv4_header.error_datagram_length_not_matching))
{
return(easy_socket.hexa_convert.byte_to_hexa(raw_data));
}
string[] data = null;
// case of no data in original datagram
if (ipv4h.data == null)
{
data = packet_ToStringArray.ip_raw(ref ipv4h, b_most_important_info_only);
}
else if (ipv4h.data.Length < 1)
{
data = packet_ToStringArray.ip_raw(ref ipv4h, b_most_important_info_only);
}
// assume there's data in original ip datagram
else// data !=null && length>1
{
switch (ipv4h.protocol)
{
// if icmp protocol
case easy_socket.ip_header.ipv4_header.protocol_icmp:
switch (ipv4h.data[0])// switch type (see icmp protocol)
{
case easy_socket.icmp.icmp.EchoReply:
easy_socket.icmp.icmp_echo_reply icmper = new easy_socket.icmp.icmp_echo_reply();
if (icmper.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_echo_reply(ref ipv4h, ref icmper, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.DestinationUnreachable:
easy_socket.icmp.icmp_destination_unreachable icmpdu = new easy_socket.icmp.icmp_destination_unreachable();
if (icmpdu.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_destination_unreachable(ref ipv4h, ref icmpdu, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.SourceQuench:
easy_socket.icmp.icmp_source_quench icmpsq = new easy_socket.icmp.icmp_source_quench();
if (icmpsq.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_source_quench(ref ipv4h, ref icmpsq, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.Redirect:
easy_socket.icmp.icmp_redirect icmpr = new easy_socket.icmp.icmp_redirect();
if (icmpr.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_redirect(ref ipv4h, ref icmpr, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.Echo:
easy_socket.icmp.icmp_echo icmpe = new easy_socket.icmp.icmp_echo();
if (icmpe.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_echo(ref ipv4h, ref icmpe, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.TimeExceeded:
easy_socket.icmp.icmp_time_exceeded_message icmptem = new easy_socket.icmp.icmp_time_exceeded_message();
if (icmptem.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_time_exceeded_message(ref ipv4h, ref icmptem, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.ParameterProblem:
easy_socket.icmp.icmp_parameter_problem icmppp = new easy_socket.icmp.icmp_parameter_problem();
if (icmppp.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_parameter_problem(ref ipv4h, ref icmppp, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.Timestamp:
easy_socket.icmp.icmp_timestamp icmpt = new easy_socket.icmp.icmp_timestamp();
if (icmpt.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_timestamp(ref ipv4h, ref icmpt, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.TimestampReply:
easy_socket.icmp.icmp_timestamp_reply icmptr = new easy_socket.icmp.icmp_timestamp_reply();
if (icmptr.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_timestamp_reply(ref ipv4h, ref icmptr, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.InformationRequest:
easy_socket.icmp.icmp_information_request icmpirequest = new easy_socket.icmp.icmp_information_request();
if (icmpirequest.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_information_request(ref ipv4h, ref icmpirequest, b_most_important_info_only);
}
break;
case easy_socket.icmp.icmp.InformationReply:
easy_socket.icmp.icmp_information_reply icmpireply = new easy_socket.icmp.icmp_information_reply();
if (icmpireply.decode(ipv4h.data) == easy_socket.icmp.icmp.error_success)
{
data = packet_ToStringArray.icmp_information_reply(ref ipv4h, ref icmpireply, b_most_important_info_only);
}
break;
//default:
}// end of icmp switch
break;
// if udp protocol
case easy_socket.ip_header.ipv4_header.protocol_udp:
easy_socket.udp_header.udp_header udph = new easy_socket.udp_header.udp_header();
udph.decode(ipv4h.source_address, ipv4h.destination_address, ipv4h.data, false); // don't check checksum
data = packet_ToStringArray.udp(ref ipv4h, ref udph, false); // show max info of original packet
break;
// if tcp protocol
case easy_socket.ip_header.ipv4_header.protocol_tcp:
easy_socket.tcp_header.tcp_header tcph = new easy_socket.tcp_header.tcp_header();
tcph.decode(ipv4h.source_address, ipv4h.destination_address, ipv4h.data, false); // don't check checksum
data = packet_ToStringArray.tcp(ref ipv4h, ref tcph, b_most_important_info_only); // show max info of original packet
break;
// other protocol
default:
data = packet_ToStringArray.ip_raw(ref ipv4h, b_most_important_info_only);
break;
} // end of protocol switch
} // end of ip data test
// Join data (string[]) to a string
if (data != null)
{
ret = System.String.Join(" ", data);
}
return(ret);
}
