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gossipd: ensure node_announcement timestamps always increment. 

Covers a possible source of subtle bugs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-01-04 22:10:46 +10:30 committed by Christian Decker
parent bc631166f0
commit 61be62ddb7
1 changed files with 12 additions and 1 deletions
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13
gossipd/gossip.c
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@ -78,6 +78,9 @@ struct daemon {
u8 alias[33];
u8 rgb[3];
struct wireaddr *wireaddrs;
/* To make sure our node_announcement timestamps increase */
u32 last_announce_timestamp;
};
/* Peers we're trying to reach. */
@ -421,7 +424,14 @@ static void send_node_announcement(struct daemon *daemon)
tal_t *tmpctx = tal_tmpctx(daemon);
u32 timestamp = time_now().ts.tv_sec;
secp256k1_ecdsa_signature sig;
u8 *msg, *nannounce = create_node_announcement(tmpctx, daemon, NULL, timestamp);
u8 *msg, *nannounce;
/* Timestamps must move forward, or announce will be ignored! */
if (timestamp <= daemon->last_announce_timestamp)
timestamp = daemon->last_announce_timestamp + 1;
daemon->last_announce_timestamp = timestamp;
nannounce = create_node_announcement(tmpctx, daemon, NULL, timestamp);
if (!wire_sync_write(HSM_FD, take(towire_hsm_node_announcement_sig_req(tmpctx, nannounce))))
status_failed(STATUS_FAIL_MASTER_IO, "Could not write to HSM: %s", strerror(errno));
@ -1634,6 +1644,7 @@ int main(int argc, char *argv[])
list_head_init(&daemon->addrhints);
timers_init(&daemon->timers, time_mono());
daemon->broadcast_interval = 30000;
daemon->last_announce_timestamp = 0;
/* stdin == control */
daemon_conn_init(daemon, &daemon->master, STDIN_FILENO, recv_req,