// See the file "COPYING" in the main distribution directory for copyright.

#include "zeek/analyzer/protocol/socks/SOCKS.h"

#include "zeek/analyzer/protocol/socks/socks_pac.h"
#include "zeek/analyzer/protocol/tcp/TCP_Reassembler.h"

namespace zeek::analyzer::socks {

SOCKS_Analyzer::SOCKS_Analyzer(Connection* conn) : analyzer::tcp::TCP_ApplicationAnalyzer("SOCKS", conn) {
    interp = new binpac::SOCKS::SOCKS_Conn(this);
    orig_done = resp_done = false;
    pia = nullptr;
}

SOCKS_Analyzer::~SOCKS_Analyzer() { delete interp; }

void SOCKS_Analyzer::EndpointDone(bool orig) {
    if ( orig )
        orig_done = true;
    else
        resp_done = true;
}

void SOCKS_Analyzer::Done() {
    analyzer::tcp::TCP_ApplicationAnalyzer::Done();

    interp->FlowEOF(true);
    interp->FlowEOF(false);
}

void SOCKS_Analyzer::EndpointEOF(bool is_orig) {
    analyzer::tcp::TCP_ApplicationAnalyzer::EndpointEOF(is_orig);
    interp->FlowEOF(is_orig);
}

void SOCKS_Analyzer::DeliverStream(int len, const u_char* data, bool orig) {
    analyzer::tcp::TCP_ApplicationAnalyzer::DeliverStream(len, data, orig);

    if ( TCP() && TCP()->IsPartial() )
        return;

    if ( orig_done && resp_done ) {
        // Finished decapsulating tunnel layer. Now do standard processing
        // with the rest of the connection.
        //
        // Note that we assume that no payload data arrives before both endpoints
        // are done with their part of the SOCKS protocol.
        if ( ! pia ) {
            pia = new analyzer::pia::PIA_TCP(Conn());
            if ( AddChildAnalyzer(pia) ) {
                pia->FirstPacket(true, TransportProto::TRANSPORT_TCP);
                pia->FirstPacket(false, TransportProto::TRANSPORT_TCP);
            }
            else
                pia = nullptr;
        }

        ForwardStream(len, data, orig);
    }
    else {
        try {
            interp->NewData(orig, data, data + len);
        } catch ( const binpac::Exception& e ) {
            AnalyzerViolation(util::fmt("Binpac exception: %s", e.c_msg()));
        }
    }
}

void SOCKS_Analyzer::Undelivered(uint64_t seq, int len, bool orig) {
    analyzer::tcp::TCP_ApplicationAnalyzer::Undelivered(seq, len, orig);
    interp->NewGap(orig, len);
}

} // namespace zeek::analyzer::socks
