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a1bdaa8f99
connectd is the only user of the cryptomsg async APIs; better to open-code it here. We need to expose a little from cryptomsg(), but we remove the 'struct peer' entirely from connectd. One trick is that we still need to defer telling lightningd when a peer reconnects (until it tells us the old one is disconnected). So now we generate the message for lightningd and send it once we're woken. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
#ifndef LIGHTNING_COMMON_CRYPTOMSG_H
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#define LIGHTNING_COMMON_CRYPTOMSG_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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#include <common/crypto_state.h>
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struct io_conn;
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struct peer;
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struct peer_crypto_state {
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struct crypto_state cs;
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/* Peer who owns us: peer->crypto_state == this */
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struct peer *peer;
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/* Output and input buffers. */
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u8 *out, *in;
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struct io_plan *(*next_in)(struct io_conn *, struct peer *, u8 *);
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struct io_plan *(*next_out)(struct io_conn *, struct peer *);
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};
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/* Initializes peer->cs (still need to read in cs->cs) */
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void init_peer_crypto_state(struct peer *peer, struct peer_crypto_state *pcs);
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/* Get decrypted message: ignores unknown odd messages. */
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struct io_plan *peer_read_message(struct io_conn *conn,
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struct peer_crypto_state *cs,
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struct io_plan *(*next)(struct io_conn *,
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struct peer *,
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u8 *msg));
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/* Sends message: frees if taken(msg). */
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struct io_plan *peer_write_message(struct io_conn *conn,
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struct peer_crypto_state *cs,
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const u8 *msg,
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struct io_plan *(*next)(struct io_conn *,
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struct peer *));
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/* BOLT #8:
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*
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* ### Receiving and Decrypting Messages
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*
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* In order to decrypt the _next_ message in the network stream, the
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* following steps are completed:
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*
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* 1. Read _exactly_ 18 bytes from the network buffer.
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*/
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#define CRYPTOMSG_HDR_SIZE 18
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/* BOLT #8:
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*
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* 4. Read _exactly_ `l+16` bytes from the network buffer
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*/
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#define CRYPTOMSG_BODY_OVERHEAD 16
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/* Low-level functions for sync comms: doesn't discard unknowns! */
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u8 *cryptomsg_encrypt_msg(const tal_t *ctx,
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struct crypto_state *cs,
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const u8 *msg);
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bool cryptomsg_decrypt_header(struct crypto_state *cs, u8 hdr[18], u16 *lenp);
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u8 *cryptomsg_decrypt_body(const tal_t *ctx,
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struct crypto_state *cs, const u8 *in);
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#endif /* LIGHTNING_COMMON_CRYPTOMSG_H */
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