wip: announce

common/json_helpers.c

@@ -281,6 +281,10 @@ void json_add_address(struct json_stream *response, const char *fieldname,
 		json_add_string(response, "type", "torv3");
 		json_add_string(response, "address", fmt_wireaddr_without_port(tmpctx, addr));
 		json_add_num(response, "port", addr->port);
+	} else if (addr->type == ADDR_TYPE_DNS) {
+		json_add_string(response, "type", "dns");
+		json_add_string(response, "address", fmt_wireaddr_without_port(tmpctx, addr));
+		json_add_num(response, "port", addr->port);
 	}
 	json_object_end(response);
 }

common/wireaddr.c

@@ -37,6 +37,11 @@ bool fromwire_wireaddr(const u8 **cursor, size_t *max, struct wireaddr *addr)
 	case ADDR_TYPE_TOR_V3:
 		addr->addrlen = TOR_V3_ADDRLEN;
 		break;
+	case ADDR_TYPE_DNS:
+		addr->addrlen = fromwire_u8(cursor, max);
+		memset(&addr->addr, 0, sizeof(addr->addr));
+		addr->addr[addr->addrlen] = 0;
+		break;
 	default:
 		return false;
 	}
@@ -49,6 +54,8 @@ bool fromwire_wireaddr(const u8 **cursor, size_t *max, struct wireaddr *addr)
 void towire_wireaddr(u8 **pptr, const struct wireaddr *addr)
 {
 	towire_u8(pptr, addr->type);
+	if (addr->type == ADDR_TYPE_DNS)
+		towire_u8(pptr, addr->addrlen);
 	towire(pptr, addr->addr, addr->addrlen);
 	towire_u16(pptr, addr->port);
 }
@@ -192,6 +199,7 @@ bool wireaddr_is_wildcard(const struct wireaddr *addr)
 		return memeqzero(addr->addr, addr->addrlen);
 	case ADDR_TYPE_TOR_V2:
 	case ADDR_TYPE_TOR_V3:
+	case ADDR_TYPE_DNS:
 		return false;
 	}
 	abort();
@@ -239,6 +247,8 @@ char *fmt_wireaddr_without_port(const tal_t * ctx, const struct wireaddr *a)
 	case ADDR_TYPE_TOR_V3:
 		return tal_fmt(ctx, "%s.onion",
 			       b32_encode(tmpctx, a->addr, a->addrlen));
+	case ADDR_TYPE_DNS:
+		return tal_fmt(ctx, "%s", a->addr);
 	}
 
 	hex = tal_hexstr(ctx, a->addr, a->addrlen);
@@ -730,6 +740,8 @@ struct addrinfo *wireaddr_to_addrinfo(const tal_t *ctx,
 	struct addrinfo *ai = talz(ctx, struct addrinfo);
 	struct sockaddr_in *sin;
 	struct sockaddr_in6 *sin6;
+	struct addrinfo hints, *ais, *aii;
+	int gai_err;
 
 	ai->ai_socktype = SOCK_STREAM;
 
@@ -748,6 +760,31 @@ struct addrinfo *wireaddr_to_addrinfo(const tal_t *ctx,
 		ai->ai_addrlen = sizeof(*sin6);
 		ai->ai_addr = (struct sockaddr *)sin6;
 		return ai;
+	case ADDR_TYPE_DNS:
+		/* Resolve with getaddrinfo */
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_socktype = SOCK_STREAM;
+		hints.ai_family = AF_UNSPEC;
+		hints.ai_protocol = 0;
+		hints.ai_flags = AI_ADDRCONFIG;
+		gai_err = getaddrinfo((char *)wireaddr->addr,
+				      tal_fmt(tmpctx, "%d", wireaddr->port),
+				      &hints, &ais);
+		if (gai_err != 0) {
+			// TODO: handle errors
+			// *err_msg = gai_strerror(gai_err);
+			break;
+		}
+		for (aii = ais; aii; aii = aii->ai_next) {
+			if (aii->ai_family == AF_INET6 || aii->ai_family == AF_INET) {
+				memcpy(&ai, aii, sizeof(struct addrinfo));
+				freeaddrinfo(ais);
+				return ai;
+			}
+		}
+		freeaddrinfo(ais);
+		// TODO: handle no suitable ai_family found
+		break;
 	case ADDR_TYPE_TOR_V2:
 	case ADDR_TYPE_TOR_V3:
 		break;
@@ -801,6 +838,7 @@ bool all_tor_addresses(const struct wireaddr_internal *wireaddr)
 			switch (wireaddr[i].u.wireaddr.type) {
 			case ADDR_TYPE_IPV4:
 			case ADDR_TYPE_IPV6:
+			case ADDR_TYPE_DNS:
 				return false;
 			case ADDR_TYPE_TOR_V2:
 			case ADDR_TYPE_TOR_V3:

common/wireaddr.h

@@ -35,22 +35,24 @@ struct sockaddr_un;
  *         onion service addresses; Encodes:
  *            `[32:32_byte_ed25519_pubkey] || [2:checksum] || [1:version]`,
  *             where `checksum = sha3(".onion checksum" | pubkey || version)[:2]`
+ *   * `5`: DNS hostname; data = `[byte:len][len*byte:hostname][u16:port]` (length up to 258)
  */
 
 #define	TOR_V2_ADDRLEN 10
 #define	TOR_V3_ADDRLEN 35
-#define	LARGEST_ADDRLEN TOR_V3_ADDRLEN
+#define	DNS_ADDRLEN 255
+#define	LARGEST_ADDRLEN DNS_ADDRLEN
 #define	TOR_V3_BLOBLEN 64
 #define	STATIC_TOR_MAGIC_STRING "gen-default-toraddress"
 
 enum wire_addr_type {
 	ADDR_TYPE_IPV4 = 1,
 	ADDR_TYPE_IPV6 = 2,
 	ADDR_TYPE_TOR_V2 = 3,
-	ADDR_TYPE_TOR_V3 = 4
+	ADDR_TYPE_TOR_V3 = 4,
+	ADDR_TYPE_DNS = 5
 };
 
-/* Structure now fit for tor support */
 struct wireaddr {
 	enum wire_addr_type type;
 	u8 addrlen;

connectd/connectd.c

@@ -835,6 +835,9 @@ static void try_connect_one_addr(struct connecting *connect)
 		case ADDR_TYPE_IPV6:
 			af = AF_INET6;
 			break;
+		case ADDR_TYPE_DNS:
+			// TODO: resolve with getaddrinfo and set af
+			break;
 		}
 	}
 
@@ -990,6 +993,7 @@ static bool handle_wireaddr_listen(struct daemon *daemon,
 		return false;
 	case ADDR_TYPE_TOR_V2:
 	case ADDR_TYPE_TOR_V3:
+	case ADDR_TYPE_DNS:
 		break;
 	}
 	status_failed(STATUS_FAIL_INTERNAL_ERROR,
@@ -1409,6 +1413,8 @@ static void add_seed_addrs(struct wireaddr_internal **addrs,
 		                                   NULL, broken_reply, NULL);
 		if (new_addrs) {
 			for (size_t j = 0; j < tal_count(new_addrs); j++) {
+				if (new_addrs[j].type == ADDR_TYPE_DNS)
+					continue;
 				struct wireaddr_internal a;
 				a.itype = ADDR_INTERNAL_WIREADDR;
 				a.u.wireaddr = new_addrs[j];

connectd/netaddress.c

@@ -258,6 +258,7 @@ bool guess_address(struct wireaddr *addr)
     }
     case ADDR_TYPE_TOR_V2:
     case ADDR_TYPE_TOR_V3:
+    case ADDR_TYPE_DNS:
         status_broken("Cannot guess address type %u", addr->type);
         break;
     }

contrib/pyln-spec/bolt7/pyln/spec/bolt7/text.py

@@ -286,6 +286,7 @@
          onion service addresses; Encodes:
          `[32:32_byte_ed25519_pubkey] || [2:checksum] || [1:version]`, where
          `checksum = sha3(".onion checksum" | pubkey || version)[:2]`.
+   * `5`: DNS hostname; data = `[byte:len][len*byte:hostname][u16:port]` (length up to 258)
 
 ### Requirements
 

devtools/gossipwith.c

@@ -327,6 +327,10 @@ int main(int argc, char *argv[])
 		case ADDR_TYPE_IPV6:
 			af = AF_INET6;
 			break;
+		case ADDR_TYPE_DNS:
+			/* DNS names should have been resolved
+			 * by parse_wireaddr_internal */
+			assert(false);
 		}
 		ai = wireaddr_to_addrinfo(tmpctx, &addr.u.wireaddr);
 	}

doc/lightning-getinfo.7.md

@@ -40,7 +40,7 @@ On success, an object is returned, containing:
 - **network** (string): represents the type of network on the node are working (e.g: `bitcoin`, `testnet`, or `regtest`)
 - **fees_collected_msat** (msat): Total routing fees collected by this node
 - **address** (array of objects, optional): The addresses we announce to the world:
-  - **type** (string): Type of connection (one of "ipv4", "ipv6", "torv2", "torv3")
+  - **type** (string): Type of connection (one of "ipv4", "ipv6", "torv2", "torv3", "dns")
   - **address** (string): address in expected format for **type**
   - **port** (u16): port number
 - **binding** (array of objects, optional): The addresses we are listening on:
@@ -115,4 +115,4 @@ RESOURCES
 ---------
 
 Main web site: <https://github.com/ElementsProject/lightning>
-[comment]: # ( SHA256STAMP:a41fb9bb8e6e61bec105ff250584ae019dda93d4f97bfff53bc86d57ab6e8607)
+[comment]: # ( SHA256STAMP:ab2b63c6b0a09a6955759eab780b8197048b5aacb01c5c680371b2ade718fb1c)

doc/lightning-listnodes.7.md

@@ -36,7 +36,7 @@ If **last_timestamp** is present:
   - **color** (hex): The favorite RGB color this node advertized (always 6 characters)
   - **features** (hex): BOLT #9 features bitmap this node advertized
   - **addresses** (array of objects): The addresses this node advertized:
-    - **type** (string): Type of connection (one of "ipv4", "ipv6", "torv2", "torv3")
+    - **type** (string): Type of connection (one of "ipv4", "ipv6", "torv2", "torv3", "dns")
     - **address** (string): address in expected format for *type*
     - **port** (u16): port number
 
@@ -50,9 +50,9 @@ If **option_will_fund** is present:
     - **compact_lease** (hex): the lease as represented in the node_announcement
 
 [comment]: # (GENERATE-FROM-SCHEMA-END)
-  
+
 On failure, one of the following error codes may be returned:
- 
+
 - -32602: Error in given parameters.
 
 EXAMPLE JSON RESPONSE
@@ -87,10 +87,10 @@ Vincenzo Palazzo <<vincenzo.palazzo@protonmail.com>> wrote the initial version o
 SEE ALSO
 --------
 
-FIXME: 
+FIXME:
 
 RESOURCES
 ---------
 
 Main web site: <https://github.com/ElementsProject/lightning>
-[comment]: # ( SHA256STAMP:158477348efb51a8cf71a595b3d76dde545ab6824958c8a32d4b3dbbbe2c8121)
+[comment]: # ( SHA256STAMP:6ec13dcde7efe4ec5e5ead8df1a7b8e2915c85b7600283afb5399bb79a5525db)

doc/schemas/getinfo.schema.json

@@ -69,7 +69,7 @@
 		"properties": {
 		    "type": {
 			"type": "string",
-			"enum": [ "ipv4", "ipv6", "torv2", "torv3" ],
+			"enum": [ "ipv4", "ipv6", "torv2", "torv3", "dns" ],
 			"description": "Type of connection"
 		    },
 		    "address": {

doc/schemas/listnodes.schema.json

@@ -57,7 +57,7 @@
 					"properties": {
 					    "type": {
 						"type": "string",
-						"enum": [ "ipv4", "ipv6", "torv2", "torv3" ],
+						"enum": [ "ipv4", "ipv6", "torv2", "torv3", "dns" ],
 						"description": "Type of connection"
 					    },
 					    "address": {

lightningd/options.c

@@ -188,18 +188,38 @@ static char *opt_add_addr_withtype(const char *arg,
 	char const *err_msg;
 	struct wireaddr_internal wi;
 	bool dns_ok;
+	char *address;
+	u16 port;
 
 	assert(arg != NULL);
 	dns_ok = !ld->always_use_proxy && ld->config.use_dns;
 
-	if (!parse_wireaddr_internal(arg, &wi,
-				     ld->portnum,
-				     wildcard_ok, dns_ok, false,
-				     deprecated_apis, &err_msg)) {
-		return tal_fmt(NULL, "Unable to parse address '%s': %s", arg, err_msg);
+	if (!separate_address_and_port(tmpctx, arg, &address, &port))
+		return tal_fmt(NULL, "Unable to parse address:port '%s'", arg);
+
+	if (is_ipaddr(address) || is_toraddr(address) || ala != ADDR_ANNOUNCE) {
+		if (!parse_wireaddr_internal(arg, &wi, ld->portnum,
+					     wildcard_ok, dns_ok, false,
+					     deprecated_apis, &err_msg)) {
+			return tal_fmt(NULL, "Unable to parse address '%s': %s", arg, err_msg);
+		}
+		tal_arr_expand(&ld->proposed_listen_announce, ala);
+		tal_arr_expand(&ld->proposed_wireaddr, wi);
 	}
-	tal_arr_expand(&ld->proposed_listen_announce, ala);
-	tal_arr_expand(&ld->proposed_wireaddr, wi);
+
+	/* Add ADDR_TYPE_DNS to announce DNS hostnames */
+	if (is_dnsaddr(address) && ala & ADDR_ANNOUNCE) {
+		memset(&wi, 0, sizeof(wi));
+		wi.itype = ADDR_INTERNAL_WIREADDR;
+		wi.u.wireaddr.type = ADDR_TYPE_DNS;
+		wi.u.wireaddr.addrlen = strlen(address);
+		strncpy((char * restrict)&wi.u.wireaddr.addr,
+			address, sizeof(wi.u.wireaddr.addr));
+		wi.u.wireaddr.port = port;
+		tal_arr_expand(&ld->proposed_listen_announce, ADDR_ANNOUNCE);
+		tal_arr_expand(&ld->proposed_wireaddr, wi);
+	}
+
 	return NULL;
 
 }

tests/test_gossip.py

@@ -109,9 +109,11 @@ def test_announce_address(node_factory, bitcoind):
     """Make sure our announcements are well formed."""
 
     # We do not allow announcement of duplicates.
-    opts = {'announce-addr':
+    opts = {'disable-dns': None, 'announce-addr':
             ['4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion',
              '1.2.3.4:1234',
+             'localhost:1235',
+             'example.com:1236',
              '::'],
             'log-level': 'io',
             'dev-allow-localhost': None}
@@ -125,12 +127,31 @@ def test_announce_address(node_factory, bitcoind):
     l2.wait_channel_active(scid)
 
     # We should see it send node announce with all addresses (257 = 0x0101)
-    # local ephemeral port is masked out.
-    l1.daemon.wait_for_log(r"\[OUT\] 0101.*47"
-                           "010102030404d2"
-                           "017f000001...."
-                           "02000000000000000000000000000000002607"
-                           "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba50230032607")
+    # Note: local ephemeral port is masked out.
+    # Note: Since we `disable-dns` it should not announce a resolved IPv4
+    #       or IPv6 address for example.com
+    #
+    # Also expect the address descriptor types to be sorted!
+    # BOLT #7:
+    #   - MUST place address descriptors in ascending order.
+    l1.daemon.wait_for_log(r"\[OUT\] 0101.*0063"
+                           "010102030404d2"  # IPv4 01 1.2.3.4:1234
+                           "017f000001...."  # IPv4 01 127.0.0.1:wxyz
+                           "02000000000000000000000000000000002607"  # IPv6 02 :::9735
+                           "04e00533f3e8f2aedaa8969b3d0fa03a96e857bbb28064dca5e147e934244b9ba50230032607"  # TORv3 04
+                           "05096c6f63616c686f737404d3"       # DNS 05 len localhost:1235
+                           "050b6578616d706c652e636f6d04d4")  # DNS 05 len example.com:1236
+
+    # Check other node can parse these
+    addresses = l2.rpc.listnodes()['nodes'][0]['addresses']
+    addresses_dns = [address for address in addresses if address['type'] == 'dns']
+    assert len(addresses) == 6
+    assert len(addresses_dns) == 2
+    assert addresses_dns[0]['address'] == 'localhost'
+    assert addresses_dns[0]['port'] == 1235
+    assert addresses_dns[1]['address'] == 'example.com'
+    assert addresses_dns[1]['port'] == 1236
+
 
 
 @pytest.mark.developer("needs DEVELOPER=1")