This is generally redundant, since HTLC pointer is in that side's
commit_info, but makes HTLC completely self-contained.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rather than using the non-portable internal secp256k1 format, the updated
libsecp256k1 has a "compact" form.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Update libsecp256k1 has a normalize function, which allows us to test
if the signature was in low-S form.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Add Makefile target update-secp256k1, and run it.
The only API change is that len is now an IN-OUT parameter to serialization
functions.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
If upgrade changes configure flags, 'make distclean' can fail as it
tries to reconfigure. Deleting secp256k1/libsecp256k1.la forces a
full autogen/configure/make cycle.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We use libsecp256k1 to convert signatures to DER; we were creating a
temporary one, but we really should be handing the one we have in dstate
through. This does that, everywhere.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
BOLT has been updated, so update code and comments. The receiving
side check is sufficient, as the limit is per-offerer, and that's the
only way the HTLCs get back to the offerer's side.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Thus a node MUST estimate the deadline for successful redemption for
each HTLC it offers. A node MUST NOT offer a HTLC after this
deadline, and MUST fail the connection if an HTLC which it offered is
in either node's current commitment transaction past this deadline.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The most complex thing we've logged yet, so we extract the core of the
log_struct_ function to call it multiple times.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
There's a corner case where they had it in their commit tx, in which
case we can't fail the HTLC until our commit tx has won. Again, we
use dstate->config.min_htlc_expiry.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We now need to use bitcoin_witness_htlc with the r value, so that API
is updated to take 'struct rval' or 'struct sha256'.
We use the nc->delay amount (ie. dstate->config.min_htlc_expiry) to
wait for a timeout refund to be buried before "failing" upstream.
This should probably be made into a clearer parameter rather than
overloading this one.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Header from folded patch 'dont-use-peer-nc-in-onchain-code.patch':
peer: Don't use peer->nc->delay for onchain case.
Use the config var directly. We should be freeing peer->nc when the
connection dies anyway.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is the command an actual user would use: it figures out the fee
and route, and pays it if it can.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
If a block triggers two peers to close, we ran io_break() on both of them; the
second overrode the first and we didn't end up freeing that one.
Rather than chase such bugs in future, simply iterate to see if any
peers need freeing.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Note that the base fee is in millisatoshi, the proportional fee is
in microsatoshi per satoshi. ie. 1,000,000 means charge 1 satoshi for
every satoshi carried.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Most HTLCs we offer are triggered by an incoming HTLC from a different
peer. Save this "source" htlc, so we can fail/fulfill it when we
fail/fulfill this one.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
No more copies!
I tried changing the cstate->side[].htlcs to htlc_map rather than a
simple pointer array, but we rely on those array indices heavily for
permutation mapping, and it turned into a major rewrite (especially
for the steal case).
Eventually, we're going to want to reconstruct the commit info for
older commit txs rather than keeping all the permutation and
per-commit-info HTLC information in memory, so we can do the work
then.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We currently keep copies of HTLCs in each commit_info structure, but
that's redundant. Keep per-peer per-direction maps of HTLCs, then we can
just throw pointers around (next patch).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's a more logical name, and a more logical place. We change
"funding" to "channel" in the remaining exposed symbols, too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We're about to change the code so that if it can't route, it will fail
the HTLC. The current low-level tests will hate this, so have a dev switch
to turn that off.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is the logical place for it to belong: with the HTLC. For the manually-created
HTLCs, we create a simple one-hop route.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is the more normal case; find by ID. The low-level json commands are
really just for testing.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The protocol still supports both, but we now only support blocks.
It's hard to do risk management with timeouts in seconds, given block
variance. This is also signficantly simpler, as HTLC timeouts are
always fired in response to blocks, not wall-clock times.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Uses a gcc extension (cast to union) for typechecking, but that can be
removed for compilers which don't support it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
A new 'accept-payment' command tells the node to fulfill HTLCs using
the R value if the amount is correct. It's not wired in yet.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We need to know when changes are fully committed by both sides:
1) For their HTLC_ADDs, this is when we can fulfill/fail/route.
2) For their HTLC_FAILs, this is when we can fail incoming.
For HTLC_FULFULL we don't need to wait: as soon as we know the preimage
we can propogate it.
For the moment, we simply log and assert; acting on it comes later.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
While the pointer is only valid until the funding changes, that's also
true of the offset; and a pointer has a convenient "not found"
sentinal value.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rusty Russell