nx_mdns.nx

buildroot/runtime/nx_mdns.nx

6547 B143 linesdepth 1pulls 1 transitivereach 1 importersview sourcekind library

docs dependencies structs consts functions

about

nx_mdns.nx -- sovereign mDNS / DNS-SD service discovery for IPP printers (RFC 6762 + RFC 6763): the R3 "find ANY printer on the LAN" rung. REUSES the proven RFC-1035 substrate nx_dns.nx (bounded, compression- safe name handling -- the hard part, with a 128-hop anti-cycle guard) and adds the DNS-SD layer: from a `_ipp._tcp` response, extract a printer's SRV port, A-record IPv4, and the TXT "rp" (resource path) -- exactly the (ip, port, rp) tuple nx_printer_query needs to then talk IPP. PURE parser (no syscalls; the caller owns every buffer) -> never-brick #26 + architecture-neutral, and no_silent_failure (a malformed message yields a sealed MALFORMED verdict, never a false success). LIVE NOTE (honest): mDNS is multicast (224.0.0.251:5353); WSL's NAT does NOT forward multicast to the 192.168.8 LAN, so LIVE discovery needs mirrored networking / a Windows-native radio runner. The parser + the query builder are gateable OFFLINE now (this file); the live send/recv composes nx_udp later. genealogy_id: project-printer-management-ipp-sclass-2026-06-20 ; license_tier: ORIGINAL reuses: nx_dns.nx (international-research-sources/ietf/rfc_1035 + rfc_6763 DNS-SD)

dependencies 1 imports · 1 importers

imports: nx_dns.nx

imported by: nx_mdns_test.nx

structs

none

consts

18	const NX_DNSSD_TYPE_SRV: i64 = 33 // RFC 2782 SRV (not in nx_dns.nx's type table)
20	const NX_MDNS_OK: i64 = 1
21	const NX_MDNS_NOT_FOUND: i64 = 2
22	const NX_MDNS_MALFORMED: i64 = 3

functions

24	func nx_mdns_verdict_is_valid(v: i64) -> i64 called by 1: main
33	func nx_mdns_find_rr(buf: u8, n: i64, want_type: i64, out_rdoff: i64, out_rdlen: *i64) -> i64 called by 2: nx_mdns_extract_printer main calls 2: nx_dns_get_u16_be nx_dns_skip_name
72	func nx_mdns_srv_port(buf: u8, rdoff: i64, rdlen: i64, out_port: i64) -> i64 called by 1: nx_mdns_extract_printer calls 1: nx_dns_get_u16_be
79	func nx_mdns_a_ip(buf: u8, rdoff: i64, rdlen: i64, out4: i64) -> i64 called by 1: nx_mdns_extract_printer
89	func nx_mdns_txt_get(buf: u8, rdoff: i64, rdlen: i64, key: u8, klen: i64, out: u8, cap: i64, out_len: i64) -> i64 called by 1: nx_mdns_extract_printer
124	func nx_mdns_extract_printer(buf: u8, n: i64, out5: i64, rp_out: u8, rp_cap: i64, rp_len: i64, scratch2: *i64) -> i64 called by 1: main calls 4: nx_mdns_find_rr nx_mdns_srv_port nx_mdns_a_ip nx_mdns_txt_get
141	func nx_mdns_build_ipp_query(out: *u8, out_cap: i64, tx_id: i64) -> i64 called by 1: main calls 1: nx_dns_build_query