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gossip: Use the DNS seeds to look up nodes if we don't have an addr

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Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2018-04-23 16:36:16 +02:00
parent a0c1b7af1f
commit b84804009a
1 changed files with 32 additions and 1 deletions
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33
gossipd/gossip.c
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@ -14,6 +14,8 @@
#include <ccan/take/take.h>
#include <ccan/tal/str/str.h>
#include <ccan/timer/timer.h>
#include <common/bech32.h>
#include <common/bech32_util.h>
#include <common/cryptomsg.h>
#include <common/daemon_conn.h>
#include <common/features.h>
@ -1630,6 +1632,32 @@ static struct io_plan *conn_init(struct io_conn *conn, struct reaching *reach)
return io_connect(conn, &ai, connection_out, reach);
}
static struct addrhint *
seed_resolve_addr(const tal_t *ctx, const struct pubkey *id, const u16 port)
{
struct addrhint *a;
char bech32[100], *addr;
u8 der[PUBKEY_DER_LEN];
u5 *data = tal_arr(ctx, u5, 0);
pubkey_to_der(der, id);
bech32_push_bits(&data, der, PUBKEY_DER_LEN*8);
bech32_encode(bech32, "ln", data, tal_count(data), sizeof(bech32));
addr = tal_fmt(ctx, "%s.lseed.bitcoinstats.com", bech32);
status_trace("Resolving %s", addr);
a = tal(ctx, struct addrhint);
if (!wireaddr_from_hostname(&a->addr, addr, port, NULL)) {
status_trace("Could not resolve %s", addr);
return tal_free(a);
} else {
status_trace("Resolved %s to %s", addr,
type_to_string(ctx, struct wireaddr, &a->addr));
return a;
}
}
static void try_connect(struct reaching *reach)
{
struct addrhint *a;
@ -1644,8 +1672,11 @@ static void try_connect(struct reaching *reach)
}
a = find_addrhint(reach->daemon, &reach->id);
if (!a)
a = seed_resolve_addr(reach, &reach->id, 9735);
if (!a) {
/* FIXME: now try node table, dns lookups... */
status_info("No address known for %s, giving up",
type_to_string(tmpctx, struct pubkey, &reach->id));
daemon_conn_send(