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

#pragma once

#include "zeek/analyzer/protocol/login/Login.h"
#include "zeek/analyzer/protocol/tcp/ContentLine.h"

namespace zeek::analyzer::login {

class Rsh_Analyzer;

enum rsh_state : uint8_t {
    RSH_FIRST_NULL,       // waiting to see first NUL
    RSH_CLIENT_USER_NAME, // scanning client user name up to NUL
    RSH_SERVER_USER_NAME, // scanning server user name up to NUL
    RSH_INITIAL_CMD,      // scanning initial command up to NUL

    RSH_LINE_MODE, // switch to line-oriented processing

    RSH_PRESUMED_REJECTED, // apparently server said No Way

    RSH_UNKNOWN, // we don't know what state we're in
};

class Contents_Rsh_Analyzer final : public analyzer::tcp::ContentLine_Analyzer {
public:
    Contents_Rsh_Analyzer(Connection* conn, bool orig, Rsh_Analyzer* analyzer);
    ~Contents_Rsh_Analyzer() override = default;

    rsh_state RshSaveState() const { return save_state; }

protected:
    void DoDeliver(int len, const u_char* data) override;
    void BadProlog();

    rsh_state state, save_state;
    int num_bytes_to_scan;

    Rsh_Analyzer* analyzer;
};

class Rsh_Analyzer final : public Login_Analyzer {
public:
    explicit Rsh_Analyzer(Connection* conn);

    void DeliverStream(int len, const u_char* data, bool orig) override;

    void ClientUserName(const char* s);
    void ServerUserName(const char* s);

    static analyzer::Analyzer* Instantiate(Connection* conn) { return new Rsh_Analyzer(conn); }

    Contents_Rsh_Analyzer* contents_orig;
    Contents_Rsh_Analyzer* contents_resp;
};

} // namespace zeek::analyzer::login
