Active.h

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// $Id: Active.h,v 1.1 2004/07/14 20:15:39 jason Exp $

#ifndef active_h
#define active_h

#include <string>
using namespace std;

#include "util.h"

enum ReassemblyPolicy {
        RP_UNKNOWN,
        RP_BSD, // Left-trim to equal or lower offset frags
        RP_LINUX,       // Left-trim to strictly lower offset frags
        RP_FIRST,       // Accept only new (no previous value) octets
        RP_LAST // Accept all
};

struct NumericData {
        ReassemblyPolicy ip_reassem;
        ReassemblyPolicy tcp_reassem;
        unsigned short path_MTU;        // 0 = unknown
        unsigned char hops;     // 0 = unknown
        bool accepts_rst_in_window;
        bool accepts_rst_outside_window;
        bool accepts_rst_in_sequence;
};

// Return value is whether or not there was a known result for that
// machine (actually, IP address in network order); if not, a default
// is returned. Note that the map data is a string in all cases: the
// numeric form is more efficient and is to be preferred ordinarily.
bool get_map_result(uint32 ip_addr, const char* key, string& result);

// Basically a special case of get_map_result(), but returns numbers
// directly for efficiency reasons, since these are frequently
// looked up. ### Perhaps a better generic mechanism is in order.
bool get_map_result(uint32 ip_addr, const NumericData*& result);

// Reads in AM data from the specified file (basically [IP, policy] tuples)
// Should be called at initialization time.
bool load_mapping_table(const char* map_file);

#endif

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