dcrubro
21fe73fb01
- Implement NodeDiscovery engine: known-peer table (DynArr) with a per-tick seed/ping/query/connect state machine driven by the node maintenance thread; bounded multi-hop crawl (FANOUT peers per node, hop-capped) that connects to reachable peers lowest-ping-first - Add GET_PEERS/PEERS TCP opcodes for peer-list exchange, handled on both inbound and outbound connections - Measure UDP round-trip time and pass it to the on_pong callback (previously the send timestamp was only used for retries) - Advertise each node's listen port in HELLO/ACK_HELLO and store it per-connection, so inbound-only peers and non-default ports are discoverable (length-guarded parse; wire-compatible with old peers) - Wire a udp_node_t + node_discovery_t into net_node_t: init/start in Node_Create, tick in the maintenance loop, teardown in Node_Destroy (stop UDP before destroying discovery to avoid callback races) - Add Node_ConnListenEndpoint / Node_GetPeerEndpoints helpers to derive peers' listen endpoints (outbound: dialed port; inbound: advertised), with IPv4-mapped-IPv6 normalization and IP+port dedup - Match ping pong/timeout callbacks by peer address (the UDP layer owns the nonce), fixing discovered peers stuck UNREACHABLE - Ping the peer's listen port instead of the ephemeral TCP source port (fixes the original stub so pongs actually return) - Add `peers` CLI command to dump the discovery table (endpoint/hop/ state/ping) - Add discovery tunables to constants.h (fanout, max hops, target connections, timeouts, caps)
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
#ifndef UDP_NODE_H
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#define UDP_NODE_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <pthread.h>
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#include <netinet/in.h>
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#include <udpd/udppackettype.h>
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#define UDP_LISTEN_PORT 9393
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#define UDP_PING_RETRY_INTERVAL_MS 1000
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#define UDP_PING_MAX_RETRIES 3
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#define UDP_MAX_PENDING_PINGS 64
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typedef struct {
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uint64_t nonce;
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struct sockaddr_storage dest;
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uint64_t lastSentMs;
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int retries;
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bool active;
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} pending_ping_t;
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typedef struct udp_node {
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int sockFd; // AF_INET6, IPV6_V6ONLY=1
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int sockFdV4; // AF_INET
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volatile int isRunning;
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pthread_t recvThreadV6;
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pthread_t recvThreadV4;
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pthread_t retryThread;
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pending_ping_t pendingPings[UDP_MAX_PENDING_PINGS];
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pthread_mutex_t pingsMutex;
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void (*on_pong)(struct udp_node* node,
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const struct sockaddr_storage* from,
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uint64_t nonce, int protoVersion, uint64_t rttMs, void* user);
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void (*on_ping_timeout)(struct udp_node* node,
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const struct sockaddr_storage* dest,
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uint64_t nonce, void* user);
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void* callbackUser;
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} udp_node_t;
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int UdpNode_Init(udp_node_t* node, uint16_t port);
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void UdpNode_SetCallbacks(udp_node_t* node,
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void (*on_pong)(udp_node_t*, const struct sockaddr_storage*, uint64_t, int, uint64_t, void*),
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void (*on_ping_timeout)(udp_node_t*, const struct sockaddr_storage*, uint64_t, void*),
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void* user);
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int UdpNode_Start(udp_node_t* node);
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void UdpNode_Stop(udp_node_t* node);
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void UdpNode_Destroy(udp_node_t* node);
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int UdpNode_SendPing(udp_node_t* node, const struct sockaddr_storage* dest);
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#endif
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