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lightningd/peer_failed: helper to send PKT_ERR and exit daemon.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-02-24 16:22:55 +10:30
parent 13ac472062
commit 89af53267b
3 changed files with 64 additions and 0 deletions
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2
lightningd/Makefile
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@ -32,6 +32,7 @@ LIGHTNINGD_OLD_LIB_SRC := \
LIGHTNINGD_OLD_LIB_OBJS := $(LIGHTNINGD_OLD_LIB_SRC:.c=.o)
LIGHTNINGD_OLD_LIB_HEADERS := $(LIGHTNINGD_OLD_LIB_SRC:.c=.h)
# FIXME: put in a library so we don't link all of them.
LIGHTNINGD_LIB_SRC := \
lightningd/channel.c \
lightningd/channel_config.c \
@ -41,6 +42,7 @@ LIGHTNINGD_LIB_SRC := \
lightningd/funding_tx.c \
lightningd/htlc_tx.c \
lightningd/key_derive.c \
lightningd/peer_failed.c \
lightningd/utxo.c
LIGHTNINGD_LIB_OBJS := $(LIGHTNINGD_LIB_SRC:.c=.o)

41
lightningd/peer_failed.c Normal file
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@ -0,0 +1,41 @@
#include <ccan/tal/str/str.h>
#include <fcntl.h>
#include <lightningd/crypto_sync.h>
#include <lightningd/peer_failed.h>
#include <status.h>
#include <stdarg.h>
#include <unistd.h>
#include <wire/gen_peer_wire.h>
/* We only support one channel per peer anyway */
void peer_failed(int peer_fd, struct crypto_state *cs,
const struct channel_id *channel_id,
u16 error_code, const char *fmt, ...)
{
va_list ap;
const char *errmsg;
struct channel_id all_channels;
u8 *msg;
/* BOLT #1:
*
* A node sending `error` MUST fail the channel referred to by the
* `channel-id`, or if `channel-id` is `0xFFFFFFFFFFFFFFFF` it MUST
* fail all channels and MUST close the connection.
*/
if (!channel_id) {
memset(&all_channels, 0xFF, sizeof(all_channels));
channel_id = &all_channels;
}
va_start(ap, fmt);
errmsg = tal_vfmt(NULL, fmt, ap);
va_end(ap);
msg = towire_error(errmsg, channel_id, (const u8 *)errmsg);
/* This is only best-effort; don't block. */
fcntl(peer_fd, F_SETFL, fcntl(peer_fd, F_GETFL) | O_NONBLOCK);
sync_crypto_write(cs, peer_fd, msg);
status_failed(error_code, "%s", errmsg);
}

21
lightningd/peer_failed.h Normal file
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@ -0,0 +1,21 @@
#ifndef LIGHTNING_LIGHTNINGD_PEER_FAILED_H
#define LIGHTNING_LIGHTNINGD_PEER_FAILED_H
#include "config.h"
#include <ccan/compiler/compiler.h>
#include <ccan/short_types/short_types.h>
struct channel_id;
/**
* peer_failed - Try sending error to peer, but exit with status.
* @peer_fd: file descriptor for peer.
* @cs: the peer's current crypto state.
* @channel_id: channel with error, or NULL for all.
* @error_code: error code as per status_failed
* @fmt: format as per status_failed
*/
void peer_failed(int peer_fd, struct crypto_state *cs,
const struct channel_id *channel_id,
u16 error_code, const char *fmt, ...)
PRINTF_FMT(5,6) NORETURN;
#endif /* LIGHTNING_STATUS_H */