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#pragma once
#include <cstdint>
#include <optional>
#include <span>
#include <string>
#include <vector>
// Small interface/vtable for L7 dissectors (PLAN.md's architecture
// sketch), so protocols can be registered and added incrementally
// without touching the L2-L4 decode path or main.cpp's dispatch logic.
namespace wireframe::net {
class L7Dissector {
public:
virtual ~L7Dissector() = default;
// The transport port this dissector claims (e.g. 53 for DNS). A
// single fixed port is enough for the protocols in scope so far;
// dissectors needing a port range or heuristic sniffing can widen
// this later without changing the registry's shape.
virtual std::uint16_t port() const = 0;
// A one-line summary of the payload, or nullopt if it doesn't look
// like this protocol (e.g. truncated/malformed).
virtual std::optional<std::string> summarize(std::span<const unsigned char> payload) const = 0;
};
class L7Registry {
public:
void add(const L7Dissector* dissector) { dissectors_.push_back(dissector); }
std::optional<std::string> dissect(std::uint16_t port,
std::span<const unsigned char> payload) const {
for (const auto* dissector : dissectors_) {
if (dissector->port() == port) return dissector->summarize(payload);
}
return std::nullopt;
}
private:
std::vector<const L7Dissector*> dissectors_;
};
} // namespace wireframe::net
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