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peer_fail: handle incoming reconnections.

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We kill the existing connection if possible; this may mean simply
forgetting the prior peer altogether if it's in an early state.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-05-23 21:47:19 +09:30
parent 3126eed4de
commit f4722e93a0
2 changed files with 138 additions and 4 deletions
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1
lightningd/gossip/gossip.c
View File

@ -144,6 +144,7 @@ static void send_peer_with_fds(struct peer *peer, const u8 *msg)
/* Now we talk to socket to get to peer's owner daemon. */
peer->local = false;
/* FIXME: Forget peer if other end is closed. */
daemon_conn_init(peer, &peer->owner_conn, fds[0], owner_msg_in);
peer->owner_conn.msg_queue_cleared_cb = nonlocal_dump_gossip;

141
lightningd/peer_control.c
View File

@ -69,13 +69,23 @@ void peer_fail(struct peer *peer, const char *fmt, ...)
if (!peer_persists(peer)) {
log_info(peer->log, "Only reached state %s: forgetting",
peer_state_name(peer->state));
tal_free(peer);
return;
goto dont_talk;
}
/* Reconnect unless we've dropped to chain. */
if (!peer_on_chain(peer))
if (!peer_on_chain(peer)) {
peer_reconnect(peer);
return;
}
dont_talk:
/* In case we reconnected in the meantime. */
if (peer->fd != -1) {
/* FIXME: We should retransmit error if this happens. */
close(peer->fd);
}
tal_free(peer);
return;
}
void peer_set_condition(struct peer *peer, enum peer_state old_state,
@ -90,14 +100,137 @@ void peer_set_condition(struct peer *peer, enum peer_state old_state,
peer->state = state;
}
static bool peer_start_channeld_hsmfd(struct subd *hsm, const u8 *resp,
const int *fds,
struct peer *peer);
/* Returns true if we consider this a reconnection. */
static bool peer_reconnected(struct lightningd *ld,
const struct pubkey *id,
int fd,
const struct crypto_state *cs)
{
struct peer *peer = peer_by_id(ld, id);
if (!peer)
return false;
log_info(peer->log, "Peer has reconnected, state %s",
peer_state_name(peer->state));
/* Always copy cryptostate; at worst we'll throw it away. */
tal_free(peer->cs);
peer->cs = tal_dup(peer, struct crypto_state, cs);
switch (peer->state) {
/* This can't happen. */
case UNINITIALIZED:
abort();
case GOSSIPD:
/* Tell gossipd to kick that one out, will call peer_fail */
subd_send_msg(peer->ld->gossip,
take(towire_gossipctl_fail_peer(peer,
peer->unique_id)));
tal_free(peer);
/* Continue with a new peer. */
return false;
case OPENINGD:
/* Kill off openingd, forget old peer. */
peer->owner->peer = NULL;
tal_free(peer->owner);
tal_free(peer);
/* A fresh start. */
return false;
case GETTING_SIG_FROM_HSM:
/* BOLT #2:
*
* On disconnection, the funder MUST remember the channel for
* reconnection if it has broadcast the funding transaction,
* otherwise it MUST NOT.
*/
/* Free peer, which will discard HSM response. */
tal_free(peer);
/* Start afresh */
return false;
case GETTING_HSMFD:
/* Simply substitute old fd for new one. */
assert(peer->fd != -1);
close(peer->fd);
peer->fd = fd;
return true;
case CHANNELD_AWAITING_LOCKIN:
/* Kill off current channeld, if any. */
if (peer->owner) {
peer->owner->peer = NULL;
peer->owner = tal_free(peer->owner);
}
assert(peer->fd == -1);
peer->fd = fd;
/* Start a new one: first get fresh hsm fd. */
peer_set_condition(peer, CHANNELD_AWAITING_LOCKIN,
GETTING_HSMFD);
/* Get fd from hsm. */
subd_req(peer, peer->ld->hsm,
take(towire_hsmctl_hsmfd_channeld(peer,
peer->unique_id)),
-1, 1, peer_start_channeld_hsmfd, peer);
return true;
case CHANNELD_NORMAL:
/* Kill off current channeld, if any */
if (peer->owner) {
peer->owner->peer = NULL;
peer->owner = tal_free(peer->owner);
}
assert(peer->fd == -1);
peer->fd = fd;
/* Start a new one: first get fresh hsm fd. */
peer_set_condition(peer, CHANNELD_NORMAL, GETTING_HSMFD);
/* FIXME: Needs to reload state! */
/* Get fd from hsm. */
subd_req(peer, peer->ld->hsm,
take(towire_hsmctl_hsmfd_channeld(peer,
peer->unique_id)),
-1, 1, peer_start_channeld_hsmfd, peer);
return true;
case SHUTDOWND_SENT:
case SHUTDOWND_RCVD:
case CLOSINGD_SIGEXCHANGE:
case ONCHAIND_CHEATED:
case ONCHAIND_THEIR_UNILATERAL:
case ONCHAIND_OUR_UNILATERAL:
case ONCHAIND_MUTUAL:
; /* FIXME: Implement! */
}
abort();
}
void add_peer(struct lightningd *ld, u64 unique_id,
int fd, const struct pubkey *id,
const struct crypto_state *cs)
{
struct peer *peer = tal(ld, struct peer);
struct peer *peer;
const char *netname, *idname;
u8 *msg;
/* It's a reconnect? */
if (peer_reconnected(ld, id, fd, cs))
return;
/* Fresh peer. */
peer = tal(ld, struct peer);
peer->ld = ld;
peer->unique_id = unique_id;
peer->owner = NULL;