Add support for custom extranonce1 lengths

README

@@ -240,6 +240,9 @@ new network blocks and is 100 by default. It is intended to be a backup only
 for when the notifier is not set up and only polls if the "notify" field is
 not set on a btcd.
 
+'noncelength" : This is optional allowing the extranonce1 length to be chosen
+from 2 to 8. Default 8
+
 "update_interval" : This is the frequency that stratum updates are sent out to
 miners and is set to 30 seconds by default to help perpetuate transactions for
 the health of the bitcoin network.

ckpool.conf

@@ -16,6 +16,7 @@
 "btcaddress" : "14BMjogz69qe8hk9thyzbmR5pg34mVKB1e",
 "btcsig" : "/mined by ck/",
 "blockpoll" : 100,
+"noncelength" : 8,
 "update_interval" : 30,
 "serverurl" : "ckpool.org:3333",
 "mindiff" : 1,

src/ckpool.c

@@ -1017,6 +1017,7 @@ static void parse_config(ckpool_t *ckp)
 		ckp->btcsig[38] = '\0';
 	}
 	json_get_int(&ckp->blockpoll, json_conf, "blockpoll");
+	json_get_int(&ckp->noncelength, json_conf, "noncelength");
 	json_get_int(&ckp->update_interval, json_conf, "update_interval");
 	json_get_string(&ckp->serverurl, json_conf, "serverurl");
 	json_get_int64(&ckp->mindiff, json_conf, "mindiff");
@@ -1311,6 +1312,10 @@ int main(int argc, char **argv)
 		ckp.btcaddress = ckp.donaddress;
 	if (!ckp.blockpoll)
 		ckp.blockpoll = 100;
+	if (!ckp.noncelength)
+		ckp.noncelength = 8;
+	else if (ckp.noncelength < 2 || ckp.noncelength > 8)
+		quit(0, "Invalid noncelength %d specified, must be 2~8", ckp.noncelength);
 	if (!ckp.update_interval)
 		ckp.update_interval = 30;
 	if (!ckp.mindiff)

src/ckpool.h

@@ -148,6 +148,7 @@ struct ckpool_instance {
 	char **btcdpass;
 	bool *btcdnotify;
 	int blockpoll; // How frequently in ms to poll bitcoind for block updates
+	int noncelength; // Extranonce1 length
 
 	/* Difficulty settings */
 	int64_t mindiff; // Default 1

src/stratifier.c

@@ -410,9 +410,7 @@ static void generate_coinbase(ckpool_t *ckp, workbase_t *wb)
 	len = ser_number(wb->coinb1bin + ofs, now.tv_nsec);
 	ofs += len;
 
-	/* Leave enonce1/2varlen constant at 8 bytes for bitcoind sources */
-	wb->enonce1varlen = 8;
-	wb->enonce2varlen = 8;
+	wb->enonce1varlen = wb->enonce2varlen = ckp->noncelength;
 	wb->coinb1bin[ofs++] = wb->enonce1varlen + wb->enonce2varlen;
 
 	wb->coinb1len = ofs;
@@ -1568,10 +1566,14 @@ static bool new_enonce1(stratum_instance_t *client)
 			sdata->enonce1u.u64++;
 			ret = true;
 			break;
+		case 7:
+		case 6:
+		case 5:
 		case 4:
 			sdata->enonce1u.u32++;
 			ret = true;
 			break;
+		case 3:
 		case 2:
 			for (i = 0; i < 65536; i++) {
 				sdata->enonce1u.u16++;
@@ -1588,6 +1590,8 @@ static bool new_enonce1(stratum_instance_t *client)
 					break;
 			}
 			break;
+		default:
+			quit(0, "Invalid enonce1varlen %d", wb->enonce1varlen);
 	}
 	if (ret)
 		client->enonce1_64 = sdata->enonce1u.u64;