Add a nodeserver option for dedicated serverurls that will accept incoming requests to act as a mining node

README

@@ -176,7 +176,9 @@ maximum debug is level 7.
 -N will start ckpool in passthrough node mode where it behaves like a
 passthrough but requires a locally running bitcoind and can submit blocks
 itself in addition to passing the shares back to the upstream pool. It also
-monitors hashrate and requires more resources than a simple passthrough.
+monitors hashrate and requires more resources than a simple passthrough. Be
+aware that upstream pools must specify dedicated IPs/ports that accept
+incoming node requests with the nodeserver directive described below.
 
 -n <NAME> will change the ckpool process name to that specified, allowing
 multiple different named instances to be running. By default the variant
@@ -266,6 +268,11 @@ 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.
 
+"nodeserver" : This takes the same format as the serverurl array and specifies
+additional IPs/ports to bind to that will accept incoming requests for mining
+node communications. It is recommended to selectively isolate this address
+to minimise unnecessary communications with unauthorised nodes.
+
 "nonce1length" : This is optional allowing the extranonce1 length to be chosen
 from 2 to 8. Default 4
 

ckpool.conf

@@ -23,7 +23,10 @@
 	"ckpool.org:3333",
 	"node.ckpool.org:3333",
 	"node.ckpool.org:80"
-	],
+],
+"nodeserver" : [
+	"ckpool.org:3335"
+],
 "mindiff" : 1,
 "startdiff" : 42,
 "maxdiff" : 0,

src/ckpool.c

@@ -1283,7 +1283,7 @@ static bool parse_serverurls(ckpool_t *ckp, const json_t *arr_val)
 	if (!arr_val)
 		goto out;
 	if (!json_is_array(arr_val)) {
-		LOGWARNING("Unable to parse serverurl entries as an array");
+		LOGINFO("Unable to parse serverurl entries as an array");
 		goto out;
 	}
 	arr_size = json_array_size(arr_val);
@@ -1293,6 +1293,7 @@ static bool parse_serverurls(ckpool_t *ckp, const json_t *arr_val)
 	}
 	ckp->serverurls = arr_size;
 	ckp->serverurl = ckalloc(sizeof(char *) * arr_size);
+	ckp->nodeserver = ckzalloc(sizeof(bool) * arr_size);
 	for (i = 0; i < arr_size; i++) {
 		json_t *val = json_array_get(arr_val, i);
 
@@ -1304,6 +1305,34 @@ out:
 	return ret;
 }
 
+static void parse_nodeservers(ckpool_t *ckp, const json_t *arr_val)
+{
+	int arr_size, i, j, total_urls;
+
+	if (!arr_val)
+		return;
+	if (!json_is_array(arr_val)) {
+		LOGWARNING("Unable to parse nodeservers entries as an array");
+		return;
+	}
+	arr_size = json_array_size(arr_val);
+	if (!arr_size) {
+		LOGWARNING("Nodeserver array empty");
+		return;
+	}
+	total_urls = ckp->serverurls + arr_size;
+	ckp->serverurl = realloc(ckp->serverurl, sizeof(char *) * total_urls);
+	ckp->nodeserver = realloc(ckp->nodeserver, sizeof(bool) * total_urls);
+	for (i = 0, j = ckp->serverurls; j < total_urls; i++, j++) {
+		json_t *val = json_array_get(arr_val, i);
+
+		if (!_json_get_string(&ckp->serverurl[j], val, "nodeserver"))
+			LOGWARNING("Invalid nodeserver entry number %d", i);
+		ckp->nodeserver[j] = true;
+	}
+	ckp->serverurls = total_urls;
+}
+
 static bool parse_redirecturls(ckpool_t *ckp, const json_t *arr_val)
 {
 	bool ret = false;
@@ -1379,6 +1408,8 @@ static void parse_config(ckpool_t *ckp)
 			ckp->serverurls = 1;
 		}
 	}
+	arr_val = json_object_get(json_conf, "nodeserver");
+	parse_nodeservers(ckp, arr_val);
 	json_get_int64(&ckp->mindiff, json_conf, "mindiff");
 	json_get_int64(&ckp->startdiff, json_conf, "startdiff");
 	json_get_int64(&ckp->maxdiff, json_conf, "maxdiff");

src/ckpool.h

@@ -226,6 +226,8 @@ struct ckpool_instance {
 	server_instance_t **servers;
 	char **serverurl; // Array of URLs to bind our server/proxy to
 	int serverurls; // Number of server bindings
+	bool *nodeserver; // If this server URL serves node information
+
 	int update_interval; // Seconds between stratum updates
 
 	/* Proxy options */

src/stratifier.c

@@ -5174,7 +5174,7 @@ static void init_client(sdata_t *sdata, const stratum_instance_t *client, const
 	stratum_send_update(sdata, client_id, true);
 }
 
-static void add_mining_node(sdata_t *sdata, stratum_instance_t *client)
+static void add_mining_node(ckpool_t *ckp, sdata_t *sdata, stratum_instance_t *client)
 {
 	client->node = true;
 
@@ -5182,7 +5182,8 @@ static void add_mining_node(sdata_t *sdata, stratum_instance_t *client)
 	DL_APPEND(sdata->node_instances, client);
 	ck_wunlock(&sdata->instance_lock);
 
-	LOGWARNING("Added client %"PRId64" %s as mining node!", client->id, client->address);
+	LOGWARNING("Added client %"PRId64" %s as mining node on server %d:%s", client->id,
+		   client->address, client->server, ckp->serverurl[client->server]);
 }
 
 /* Enter with client holding ref count */
@@ -5238,9 +5239,16 @@ static void parse_method(ckpool_t *ckp, sdata_t *sdata, stratum_instance_t *clie
 
 		/* Add this client as a passthrough in the connector and
 		 * add it to the list of mining nodes in the stratifier */
-		add_mining_node(sdata, client);
+		if (!ckp->nodeserver[client->server]) {
+			LOGNOTICE("Dropping client %"PRId64" %s trying to authorise as node on non node server %d",
+				  client_id, client->address, client->server);
+			connector_drop_client(ckp, client_id);
+			drop_client(ckp, sdata, client_id);
+		} else {
+			add_mining_node(ckp, sdata, client);
 			snprintf(buf, 255, "passthrough=%"PRId64, client_id);
 			send_proc(ckp->connector, buf);
+		}
 		return;
 	}