gossipd: Add fuzz and seed to getroute request.

gossipd/gossip.c

@@ -1047,13 +1047,19 @@ static struct io_plan *getroute_req(struct io_conn *conn, struct daemon *daemon,
 	u16 riskfactor;
 	u8 *out;
 	struct route_hop *hops;
+	double fuzz;
+	u8 *seed;
 
-	fromwire_gossip_getroute_request(msg, &source, &destination,
-					 &msatoshi, &riskfactor, &final_cltv);
+	fromwire_gossip_getroute_request(tmpctx, msg,
+					 &source, &destination,
+					 &msatoshi, &riskfactor, &final_cltv,
+					 &fuzz, &seed);
 	status_trace("Trying to find a route from %s to %s for %d msatoshi",
 		     pubkey_to_hexstr(tmpctx, &source),
 		     pubkey_to_hexstr(tmpctx, &destination), msatoshi);
 
+	(void) fuzz;
+	(void) seed;
 	hops = get_route(tmpctx, daemon->rstate, &source, &destination,
 			 msatoshi, 1, final_cltv);
 

gossipd/gossip_wire.csv

@@ -107,6 +107,9 @@ gossip_getroute_request,,destination,struct pubkey
 gossip_getroute_request,,msatoshi,u32
 gossip_getroute_request,,riskfactor,u16
 gossip_getroute_request,,final_cltv,u32
+gossip_getroute_request,,fuzz,double
+gossip_getroute_request,,seedlen,u16
+gossip_getroute_request,,seed,seedlen*u8
 
 gossip_getroute_reply,3106
 gossip_getroute_reply,,num_hops,u16

lightningd/gossip_control.c

@@ -7,6 +7,7 @@
 #include <ccan/array_size/array_size.h>
 #include <ccan/err/err.h>
 #include <ccan/fdpass/fdpass.h>
+#include <ccan/isaac/isaac64.h>
 #include <ccan/take/take.h>
 #include <ccan/tal/str/str.h>
 #include <common/features.h>
@@ -22,6 +23,8 @@
 #include <lightningd/hsm_control.h>
 #include <lightningd/jsonrpc.h>
 #include <lightningd/log.h>
+#include <sodium/randombytes.h>
+#include <string.h>
 #include <wire/gen_peer_wire.h>
 #include <wire/wire_sync.h>
 
@@ -305,7 +308,7 @@ static void json_getroute(struct command *cmd, const char *buffer, const jsmntok
 	unsigned cltv = 9;
 	double riskfactor;
 	double fuzz = 5.0;
-	const char *seed = "default";
+	u8 *seed = tal_arrz(cmd, u8, ISAAC64_SEED_SZ_MAX);
 
 	if (!json_get_params(cmd, buffer, params,
 			     "id", &idtok,
@@ -364,15 +367,14 @@ static void json_getroute(struct command *cmd, const char *buffer, const jsmntok
 	/* Convert from percentage */
 	fuzz = fuzz / 100.0;
 
-	if (seedtok)
-		seed = tal_strndup(cmd, buffer + seedtok->start,
+	if (seedtok) {
+		tal_resize(&seed, seedtok->end - seedtok->start);
+		memcpy(seed, buffer + seedtok->start,
 		       seedtok->end - seedtok->start);
+	} else
+		randombytes_buf(seed, tal_len(seed));
 
-	/* TODO: include in getroute request */
-	(void) fuzz;
-	(void) seed;
-
-	u8 *req = towire_gossip_getroute_request(cmd, &source, &destination, msatoshi, riskfactor*1000, cltv);
+	u8 *req = towire_gossip_getroute_request(cmd, &source, &destination, msatoshi, riskfactor*1000, cltv, &fuzz, seed);
 	subd_req(ld->gossip, ld->gossip, req, -1, 0, json_getroute_reply, cmd);
 	command_still_pending(cmd);
 }

lightningd/payalgo.c

@@ -224,7 +224,8 @@ static bool json_pay_try(struct pay *pay)
 					     &pay->receiver_id,
 					     pay->msatoshi,
 					     pay->riskfactor,
-					     pay->min_final_cltv_expiry);
+					     pay->min_final_cltv_expiry,
+					     0, tal_arrz(pay, u8, 8));
 	subd_req(pay, cmd->ld->gossip, req, -1, 0, json_pay_getroute_reply, pay);
 
 	return true;