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openingd: don't exit when we receive an error.

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In particular, all opening_read_peer_msg() callers need to know there
was an error (presumably, negotiating) so they can stop, but we should
not exit.

This lets us reenable the final disabled test.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-08-09 09:55:29 +09:30 • committed by Christian Decker
parent 174c79acad
commit 035362e151
2 changed files with 83 additions and 21 deletions
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100
openingd/opening.c
View file

@ -73,6 +73,23 @@ struct state {
const struct chainparams *chainparams;
};
static void negotiation_aborted(struct state *state, bool am_funder,
const char *why)
{
status_debug("aborted opening negotiaion: %s", why);
peer_billboard(true, why);
/* If necessary, tell master that funding failed. */
if (am_funder) {
u8 *msg = towire_opening_funder_failed(NULL, why);
wire_sync_write(REQ_FD, take(msg));
}
/* Reset state. */
memset(&state->channel_id, 0, sizeof(state->channel_id));
state->channel = tal_free(state->channel);
}
/* For negotiation failures: we tell them it's their fault. */
static void negotiation_failed(struct state *state, bool am_funder,
const char *fmt, ...)
@ -85,21 +102,11 @@ static void negotiation_failed(struct state *state, bool am_funder,
errmsg = tal_vfmt(tmpctx, fmt, ap);
va_end(ap);
status_debug("%s", errmsg);
peer_billboard(true, errmsg);
msg = towire_errorfmt(NULL, &state->channel_id,
"You gave bad parameters: %s", errmsg);
sync_crypto_write(&state->cs, PEER_FD, take(msg));
/* If necessary, tell master that funding failed. */
if (am_funder) {
msg = towire_opening_funder_failed(NULL, errmsg);
wire_sync_write(REQ_FD, take(msg));
}
/* Reset state. */
memset(&state->channel_id, 0, sizeof(state->channel_id));
state->channel = tal_free(state->channel);
negotiation_aborted(state, am_funder, errmsg);
}
static bool check_config_bounds(struct state *state,
@ -256,12 +263,17 @@ static void temporary_channel_id(struct channel_id *channel_id)
channel_id->id[i] = pseudorand(256);
}
/* Handle random messages we might get, returning the first non-handled one. */
static u8 *opening_read_peer_msg(const tal_t *ctx, struct state *state)
/* Handle random messages we might get during opening negotiation,
* returning the first non-handled one, or NULL if we aborted negotiation. */
static u8 *opening_negotiate_msg(const tal_t *ctx, struct state *state,
bool am_funder)
{
for (;;) {
u8 *msg;
bool from_gossipd;
char *err;
bool all_channels;
struct channel_id actual;
clean_tmpctx();
msg = peer_or_gossip_sync_read(ctx, PEER_FD, GOSSIP_FD,
@ -270,12 +282,56 @@ static u8 *opening_read_peer_msg(const tal_t *ctx, struct state *state)
handle_gossip_msg(PEER_FD, &state->cs, take(msg));
continue;
}
if (!handle_peer_gossip_or_error(PEER_FD, GOSSIP_FD, &state->cs,
&state->channel_id, msg))
if (is_msg_for_gossipd(msg)) {
wire_sync_write(GOSSIP_FD, take(msg));
continue;
}
if (is_peer_error(tmpctx, msg, &state->channel_id,
&err, &all_channels)) {
/* BOLT #1:
*
* - if no existing channel is referred to by the
* message:
* - MUST ignore the message.
*/
if (!err) {
tal_free(msg);
continue;
}
if (am_funder) {
msg = towire_opening_funder_failed(NULL, err);
wire_sync_write(REQ_FD, take(msg));
}
/* Close connection on all_channels error. */
if (all_channels)
peer_failed_received_errmsg(PEER_FD, GOSSIP_FD,
&state->cs, err,
NULL);
negotiation_aborted(state, am_funder,
tal_fmt(tmpctx, "They sent error %s",
err));
/* Return NULL so caller knows to stop negotiating. */
return NULL;
}
if (is_wrong_channel(msg, &state->channel_id, &actual)) {
status_trace("Rejecting %s for unknown channel_id %s",
wire_type_name(fromwire_peektype(msg)),
type_to_string(tmpctx, struct channel_id,
&actual));
sync_crypto_write(&state->cs, PEER_FD,
take(towire_errorfmt(NULL, &actual,
"Multiple channels"
" unsupported")));
tal_free(msg);
continue;
}
return msg;
}
}
static u8 *funder_channel(struct state *state,
u64 change_satoshis, u32 change_keyindex,
u8 channel_flags,
@ -336,7 +392,9 @@ static u8 *funder_channel(struct state *state,
peer_billboard(false,
"Funding channel: offered, now waiting for accept_channel");
msg = opening_read_peer_msg(tmpctx, state);
msg = opening_negotiate_msg(tmpctx, state, true);
if (!msg)
return NULL;
/* BOLT #2:
*
@ -513,7 +571,9 @@ static u8 *funder_channel(struct state *state,
peer_billboard(false,
"Funding channel: create first tx, now waiting for their signature");
msg = opening_read_peer_msg(tmpctx, state);
msg = opening_negotiate_msg(tmpctx, state, true);
if (!msg)
return NULL;
if (!fromwire_funding_signed(msg, &id_in, &sig))
peer_failed(&state->cs,
@ -757,7 +817,9 @@ static u8 *fundee_channel(struct state *state, const u8 *open_channel_msg)
peer_billboard(false,
"Incoming channel: accepted, now waiting for them to create funding tx");
msg = opening_read_peer_msg(tmpctx, state);
msg = opening_negotiate_msg(tmpctx, state, false);
if (!msg)
return NULL;
if (!fromwire_funding_created(msg, &id_in,
&state->funding_txid,

2
tests/test_connection.py
View file

@ -543,7 +543,6 @@ def test_funding_all_too_much(node_factory):
assert only_one(l1.rpc.listfunds()['channels'])['channel_total_sat'] == 2**24 - 1
@unittest.skip("FIXME: Disabled during transition: openingd closes on negotiation fail")
def test_funding_fail(node_factory, bitcoind):
"""Add some funds, fund a channel without enough funds"""
# Previous runs with same bitcoind can leave funds!
@ -579,6 +578,7 @@ def test_funding_fail(node_factory, bitcoind):
# Should still be connected.
assert only_one(l1.rpc.listpeers()['peers'])['connected']
l2.daemon.wait_for_log('lightning_openingd-.*: Handed peer, entering loop')
assert only_one(l2.rpc.listpeers()['peers'])['connected']
# This works.