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Add discovery module: UDP multicast announcements and peer tracking

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Sends 6-byte framed announcements to 224.0.0.251:5353 on startup and
every interval_ms (default 5s). Receive thread maintains a peer table
(max 64 entries); fires on_peer_found for new peers, on_peer_lost when
a peer misses timeout_intervals (default 3) consecutive intervals.

Own announcements are filtered by name+site_id. SO_REUSEADDR+REUSEPORT
allows multiple processes on the same host for testing.

discovery_cli: announce <name> <tcp_port> [flags] — prints found/lost events.

Also notes future config module in planning.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
mikael-lovqvists-claude-agent
2026-03-26 22:19:56 +00:00
parent 744e374531
commit fe350e531e
6 changed files with 527 additions and 17 deletions
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include/discovery.h Normal file
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#pragma once
#include <stdint.h>
#include "error.h"
#define DISCOVERY_MULTICAST_GROUP "224.0.0.251"
#define DISCOVERY_PORT 5353
#define DISCOVERY_PROTOCOL_VERSION 1
#define DISCOVERY_MAX_NAME_LEN 255
#define DISCOVERY_MAX_PEERS 64
/* function_flags bits — matches protocol doc */
#define DISCOVERY_FLAG_SOURCE (1u << 0)
#define DISCOVERY_FLAG_RELAY (1u << 1)
#define DISCOVERY_FLAG_SINK (1u << 2)
#define DISCOVERY_FLAG_CONTROLLER (1u << 3)
struct Discovery_Peer {
uint32_t addr; /* source IPv4, network byte order */
uint16_t site_id;
uint16_t tcp_port;
uint16_t function_flags;
char name[DISCOVERY_MAX_NAME_LEN + 1];
};
typedef void (*Discovery_Peer_Found_Cb)(const struct Discovery_Peer *peer, void *userdata);
typedef void (*Discovery_Peer_Lost_Cb)(const struct Discovery_Peer *peer, void *userdata);
struct Discovery_Config {
/* our own identity */
uint16_t site_id;
uint16_t tcp_port;
uint16_t function_flags;
const char *name;
/* timing */
uint32_t interval_ms; /* announcement interval; 0 = use default (5000) */
uint32_t timeout_intervals; /* missed intervals before peer_lost; 0 = use default (3) */
/* callbacks */
Discovery_Peer_Found_Cb on_peer_found; /* required */
Discovery_Peer_Lost_Cb on_peer_lost; /* optional */
void *userdata;
};
struct Discovery;
struct App_Error discovery_create(struct Discovery **out, struct Discovery_Config *config);
struct App_Error discovery_start(struct Discovery *d);
void discovery_destroy(struct Discovery *d);