2178d6a70c
A maintainable, extensible BitTorrent client (C11, Linux/io_uring) targeting 10 GbE saturation. All torrent functionality is built from scratch; liburing is the only linked third-party dependency on the data path. Implements Phases 1-7 of the roadmap: - core: page-aligned buffer pool, MPMC/Treiber queues, bitfields, worker pool - crypto: SHA-1/256 (SHA-NI + scalar), Merkle (BEP-52), RC4 (MSE) - bencode/metainfo: zero-copy parser, v1/v2/hybrid .torrent + magnet - peer: sans-IO wire codec, MSE/PE handshake state machine, BEP-10, ut_metadata, PEX - piece/storage: block-level multi-peer engine, rarest-first + endgame, per-file completion events + single-file relocate (move-as-you-finish) - tracker/dht: HTTP + UDP (BEP-15) trackers, BEP-5 KRPC iterative lookup - platform: io_uring reactor (SQPOLL, registered buffers, SEND_ZC) - surface: versioned RPC, native plugin ABI, sandboxed Lua scripting, nautd/nautctl Verified against libtorrent (single/multi/hybrid, MSE, magnet-via-DHT, swarm); unit + interop tests green; ASan/UBSan/TSan clean. Scripting reference in docs/scripting.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/* metainfo.h — .torrent and magnet parsing (v1 / v2 / hybrid).
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*
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* The info-hash is computed over the *raw* bytes of the `info` dictionary as
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* they appear in the file (bencode preserves that span), never by re-encoding:
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* v1 info-hash = SHA-1 (info-bytes)
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* v2 info-hash = SHA-256(info-bytes)
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* A hybrid torrent carries both and so joins both the v1 and v2 swarms.
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*
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* Phase 2 parses v1 fully (name, piece length, file list, the 20-byte piece
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* hash table) and computes the v2 info-hash + version for hybrid/v2 files; the
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* full v2 file-tree / piece-layer plumbing is wired in Phase 3 (storage).
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*/
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#ifndef NAUT_METAINFO_H
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#define NAUT_METAINFO_H
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#include "naut/common.h"
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#include "naut/hash.h"
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typedef struct {
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char *path; /* '/'-joined, NUL-terminated */
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int64_t length;
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} naut_file;
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typedef struct naut_metainfo {
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bool has_v1, has_v2;
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uint8_t infohash_v1[NAUT_SHA1_LEN];
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uint8_t infohash_v2[NAUT_SHA256_LEN];
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char *name;
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int64_t piece_length;
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int64_t total_length;
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/* v1 piece hash table: num_pieces * 20 bytes (owned copy) */
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uint32_t num_pieces;
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const uint8_t *piece_hashes;
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naut_file *files; size_t num_files;
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char **trackers; size_t num_trackers; /* announce + announce-list, flattened */
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/* internals kept alive so piece_hashes/name stay valid */
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void *_owned;
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} naut_metainfo;
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naut_err naut_metainfo_parse(const uint8_t *data, size_t len, naut_metainfo *out);
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/* Parse a raw bencoded info dictionary obtained through BEP-9. Optional
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* tracker URLs are copied into the resulting metainfo. */
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naut_err naut_metainfo_parse_info(const uint8_t *info, size_t info_len,
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const char *const *trackers,
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size_t num_trackers,
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naut_metainfo *out);
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void naut_metainfo_free(naut_metainfo *mi);
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/* hex of the v1 info-hash (41 bytes incl NUL) — for logging/RPC. */
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void naut_infohash_v1_hex(const naut_metainfo *mi, char out[41]);
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/* --- magnet links -------------------------------------------------------- */
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typedef struct {
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bool has_v1, has_v2;
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uint8_t infohash_v1[NAUT_SHA1_LEN];
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uint8_t infohash_v2[NAUT_SHA256_LEN];
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char *name; /* dn (display name), may be NULL */
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char **trackers; size_t num_trackers; /* tr= params */
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} naut_magnet;
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naut_err naut_magnet_parse(const char *uri, naut_magnet *out);
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void naut_magnet_free(naut_magnet *m);
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#endif /* NAUT_METAINFO_H */
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