Allow configuring propagation node stamp cost

nomadnet/Directory.py

@@ -6,6 +6,8 @@ import nomadnet
 import threading
 import RNS.vendor.umsgpack as msgpack
 
+from LXMF import pn_announce_data_is_valid
+
 class PNAnnounceHandler:
     def __init__(self, owner):
         self.aspect_filter = "lxmf.propagation"
@@ -13,10 +15,10 @@ class PNAnnounceHandler:
 
     def received_announce(self, destination_hash, announced_identity, app_data):
         try:
-            if type(app_data) == bytes:
+            if pn_announce_data_is_valid(app_data):
                 data = msgpack.unpackb(app_data)
 
-                if data[0] == True:
+                if data[2] == True:
                     RNS.log("Received active propagation node announce from "+RNS.prettyhexrep(destination_hash))
 
                     associated_peer = RNS.Destination.hash_from_name_and_identity("lxmf.delivery", announced_identity)

nomadnet/NomadNetworkApp.py

@@ -130,6 +130,7 @@ class NomadNetworkApp:
         self.lxmf_max_propagation_size = None
         self.lxmf_max_sync_size        = None
         self.lxmf_max_incoming_size    = None
+        self.node_propagation_cost     = LXMF.LXMRouter.PROPAGATION_COST
 
         self.periodic_lxmf_sync = True
         self.lxmf_sync_interval = 360*60
@@ -304,7 +305,7 @@ class NomadNetworkApp:
         self.message_router = LXMF.LXMRouter(
             identity = self.identity, storagepath = self.storagepath, autopeer = True,
             propagation_limit = self.lxmf_max_propagation_size, sync_limit = self.lxmf_max_sync_size, delivery_limit = self.lxmf_max_incoming_size,
-            max_peers = self.max_peers, static_peers = static_peers,
+            max_peers = self.max_peers, static_peers = static_peers, propagation_cost=self.node_propagation_cost
         )
 
         self.message_router.register_delivery_callback(self.lxmf_delivery)
@@ -910,6 +911,13 @@ class NomadNetworkApp:
                 if value < 1:
                     value = 1
                 self.node_announce_interval = value
+
+            if not "propagation_cost" in self.config["node"]:
+                self.node_propagation_cost = 16
+            else:
+                value = self.config["node"].as_int("propagation_cost")
+                if value < 13: value = 13
+                self.node_propagation_cost = value
                 
             if "pages_path" in self.config["node"]:
                 self.pagespath = self.config["node"]["pages_path"]
@@ -1186,8 +1194,40 @@ announce_at_start = Yes
 # you should disable running a propagation node.
 # Due to lots of propagation nodes being
 # available, this is currently the default.
+
 disable_propagation = Yes
 
+# For clients and other propagation nodes
+# delivering messages via this node, you can
+# configure the minimum required propagation
+# stamp costs. All messages delivered to the
+# propagation node network must have a valid
+# propagation stamp, or they will be rejected.
+# Clients automatically detect the stamp cost
+# for the node they are delivering to, and
+# compute a corresponding stamp before trying
+# to deliver the message to the propagation
+# node.
+#
+# Propagation stamps are easier to verify in
+# large batches, and therefore also somewhat
+# easier to compute for the senders. As such,
+# a reasonable propagation stamp cost should
+# be a bit higher than the normal peer-to-peer
+# stamp costs.
+#
+# Propagation stamps does not incur any extra
+# load for propagation nodes processing them,
+# since they are only required to verify that
+# they are correct, and only the generation
+# is computationally costly. Setting a sensible
+# propagation stamp cost (and periodically
+# checking the average network consensus) helps
+# keep spam and misuse out of the propagation
+# node network.
+
+propagation_cost = 16
+
 # The maximum amount of storage to use for
 # the LXMF Propagation Node message store,
 # specified in megabytes. When this limit
@@ -1197,12 +1237,14 @@ disable_propagation = Yes
 # new and small. Large and old messages will
 # be removed first. This setting is optional
 # and defaults to 2 gigabytes.
+
 # message_storage_limit = 2000
 
 # The maximum accepted transfer size per in-
 # coming propagation message, in kilobytes.
 # This sets the upper limit for the size of
 # single messages accepted onto this node.
+
 max_transfer_size = 256
 
 # The maximum accepted transfer size per in-
@@ -1213,6 +1255,7 @@ max_transfer_size = 256
 # within this limit, it will prioritise sending
 # the smallest messages first, and try again
 # with any remaining messages at a later point.
+
 max_sync_size = 10240
 
 # You can tell the LXMF message router to
@@ -1222,29 +1265,34 @@ max_sync_size = 10240
 # keeping messages for destinations specified
 # with this option. This setting is optional,
 # and generally you do not need to use it.
+
 # prioritise_destinations = 41d20c727598a3fbbdf9106133a3a0ed, d924b81822ca24e68e2effea99bcb8cf
 
 # You can configure the maximum number of other
 # propagation nodes that this node will peer
 # with automatically. The default is 20.
+
 # max_peers = 20
 
 # You can configure a list of static propagation
 # node peers, that this node will always be
 # peered with, by specifying a list of
 # destination hashes.
+
 # static_peers = e17f833c4ddf8890dd3a79a6fea8161d, 5a2d0029b6e5ec87020abaea0d746da4
 
 # You can specify the interval in minutes for
 # rescanning the hosted pages path. By default,
 # this option is disabled, and the pages path
 # will only be scanned on startup.
+
 # page_refresh_interval = 0
 
 # You can specify the interval in minutes for
 # rescanning the hosted files path. By default,
 # this option is disabled, and the files path
 # will only be scanned on startup.
+
 # file_refresh_interval = 0
 
 [printing]
@@ -1253,6 +1301,7 @@ max_sync_size = 10240
 # various kinds of information and messages.
 
 # Printing messages is disabled by default
+
 print_messages = No
 
 # You can configure a custom template for
@@ -1260,24 +1309,29 @@ print_messages = No
 # option, set a path to the template and
 # restart Nomad Network, a default template
 # will be created that you can edit.
+
 # message_template = ~/.nomadnetwork/print_template_msg.txt
 
 # You can configure Nomad Network to only
 # print messages from trusted destinations.
+
 # print_from = trusted
 
 # Or specify the source LXMF addresses that
 # will automatically have messages printed
 # on arrival.
+
 # print_from = 76fe5751a56067d1e84eef3e88eab85b, 0e70b5848eb57c13154154feaeeb89b7
 
 # Or allow printing from anywhere, if you
 # are feeling brave and adventurous.
+
 # print_from = everywhere
 
 # You can configure the printing command.
 # This will use the default CUPS printer on
 # your system.
+
 print_command = lp
 
 # You can specify what printer to use