mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 18:11:28 +01:00
69cb158edd
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>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
#include "log.h"
|
|
#include "onion.h"
|
|
#include "peer.h"
|
|
#include "protobuf_convert.h"
|
|
#include "routing.h"
|
|
#include <string.h>
|
|
|
|
/* FIXME: http://www.cypherpunks.ca/~iang/pubs/Sphinx_Oakland09.pdf */
|
|
|
|
/* Frees r */
|
|
static const u8 *to_onion(const tal_t *ctx, const Route *r)
|
|
{
|
|
u8 *onion = tal_arr(ctx, u8, route__get_packed_size(r));
|
|
route__pack(r, onion);
|
|
tal_free(r);
|
|
return onion;
|
|
}
|
|
|
|
/* Create an onion for sending msatoshi_with_fees down path. */
|
|
const u8 *onion_create(const tal_t *ctx,
|
|
secp256k1_context *secpctx,
|
|
struct node_connection **path,
|
|
u64 msatoshi, s64 fees)
|
|
{
|
|
Route *r = tal(ctx, Route);
|
|
int i;
|
|
u64 amount = msatoshi;
|
|
|
|
route__init(r);
|
|
r->n_steps = tal_count(path) + 1;
|
|
r->steps = tal_arr(r, RouteStep *, r->n_steps);
|
|
|
|
/* Create backwards, so we can get fees correct. */
|
|
for (i = tal_count(path) - 1; i >= 0; i--) {
|
|
r->steps[i] = tal(r, RouteStep);
|
|
route_step__init(r->steps[i]);
|
|
r->steps[i]->next_case = ROUTE_STEP__NEXT_BITCOIN;
|
|
r->steps[i]->bitcoin = pubkey_to_proto(r, secpctx,
|
|
&path[i]->dst->id);
|
|
r->steps[i]->amount = amount;
|
|
amount += connection_fee(path[i], amount);
|
|
}
|
|
|
|
/* Now the stop marker. */
|
|
i = tal_count(path);
|
|
r->steps[i] = tal(r, RouteStep);
|
|
route_step__init(r->steps[i]);
|
|
r->steps[i]->next_case = ROUTE_STEP__NEXT_END;
|
|
r->steps[i]->end = true;
|
|
r->steps[i]->amount = 0;
|
|
|
|
assert(amount == msatoshi + fees);
|
|
|
|
return to_onion(ctx, r);
|
|
}
|
|
|
|
static void *proto_tal_alloc(void *allocator_data, size_t size)
|
|
{
|
|
return tal_arr(allocator_data, char, size);
|
|
}
|
|
|
|
static void proto_tal_free(void *allocator_data, void *pointer)
|
|
{
|
|
tal_free(pointer);
|
|
}
|
|
|
|
/* Decode next step in the route, and fill out the onion to send onwards. */
|
|
RouteStep *onion_unwrap(struct peer *peer,
|
|
const void *data, size_t len, const u8 **next)
|
|
{
|
|
struct ProtobufCAllocator prototal;
|
|
Route *r;
|
|
RouteStep *step;
|
|
|
|
/* De-protobuf it. */
|
|
prototal.alloc = proto_tal_alloc;
|
|
prototal.free = proto_tal_free;
|
|
prototal.allocator_data = tal(peer, char);
|
|
|
|
r = route__unpack(&prototal, len, data);
|
|
if (!r || r->n_steps == 0) {
|
|
log_unusual(peer->log, "Failed to unwrap onion");
|
|
tal_free(prototal.allocator_data);
|
|
return NULL;
|
|
}
|
|
|
|
/* Remove first step. */
|
|
step = r->steps[0];
|
|
/* Make sure that step owns the rest */
|
|
tal_steal(peer, step);
|
|
tal_steal(step, prototal.allocator_data);
|
|
|
|
/* Re-pack with remaining steps. */
|
|
r->n_steps--;
|
|
memmove(r->steps, r->steps + 1, sizeof(*r->steps) * r->n_steps);
|
|
|
|
if (!r->n_steps) {
|
|
*next = NULL;
|
|
tal_free(r);
|
|
} else
|
|
*next = to_onion(peer, r);
|
|
|
|
return step;
|
|
}
|