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This is a rewrite of the DHT for name-to-address resolution in the
unicast layer. It is now integrated as a proper directory policy. The
dir_wait_running function is removed, instead the a DHT peer is passed
on during IPCP enrolment.
Each DHT request/response gets a random 64-bit ID ('cookie'). DHT
messages to the same peer are deduped, except in the case when the DHT
is low on contacts. In that case, it will contact the per it received
at enrolment for more contacts. To combat packet loss, these messages
are not deduped by means of a 'magic cookie', chosen at random when
the DHT starts.
The DHT parameters (Kademlia) can be set using the configfile or the
IRM command line tools:
if DIRECTORY_POLICY == DHT
[dht_alpha <search factor> (default: 3)]
[dht_k <replication factor> (default: 8)]
[dht_t_expire <expiration (s)> (default: 86400)]
[dht_t_refresh <contact refresh (s)> (default: 900)]
[dht_t_replicate <replication (s)> (default: 900)]
This commit also adds support for a protocol debug level (PP).
Protocol debugging for the DHT can be enabled using the
DEBUG_PROTO_DHT build flag.
The DHT has the following message types:
DHT_STORE, sent to k peers. Not acknowledged.
DHT_STORE --> [2861814146dbf9b5|ed:d9:e2:c4].
key: bcc236ab6ec69e65 [32 bytes]
val: 00000000c4e2d9ed [8 bytes]
exp: 2025-08-03 17:29:44 (UTC).
DHT_FIND_NODE_REQ, sent to 'alpha' peers, with a corresponding
response. This is used to update the peer routing table to iteratively
look for the nodes with IDs closest to the requested key.
DHT_FIND_NODE_REQ --> [a62f92abffb451c4|ed:d9:e2:c4].
cookie: 2d4b7acef8308210
key: a62f92abffb451c4 [32 bytes]
DHT_FIND_NODE_RSP <-- [2861814146dbf9b5|ed:d9:e2:c4].
cookie: 2d4b7acef8308210
key: a62f92abffb451c4 [32 bytes]
contacts: [1]
[a62f92abffb451c4|9f:0d:c1:fb]
DHT_FIND_VALUE_REQ, sent to 'k' peers, with a corresponding
response. Used to find a value for a key. Will also send its closest
known peers in the response.
DHT_FIND_VALUE_REQ --> [2861814146dbf9b5|ed:d9:e2:c4].
cookie: 80a1adcb09a2ff0a
key: 42dee3b0415b4f69 [32 bytes]
DHT_FIND_VALUE_RSP <-- [2861814146dbf9b5|ed:d9:e2:c4].
cookie: 80a1adcb09a2ff0a
key: 42dee3b0415b4f69 [32 bytes]
values: [1]
00000000c4e2d9ed [8 bytes]
contacts: [1]
[a62f92abffb451c4|9f:0d:c1:fb]
Also removes ubuntu 20 from appveyor config as it is not supported anymore.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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Slow but steady.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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2022 was a rather slow year...
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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Growing pains.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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The connection manager and enrolment components of the unicast and
broadcast IPCP have a lot in common, as conjectured in the paper. The
initial implementation of the broadcast IPCP just duplicated the
code. This moves the shared functionality to common ground.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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The ugent email addresses are shut down, updated to Ouroboros mail
addresses.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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Happy New Year, Ouroboros!
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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This completes the renaming of the normal IPCP to the unicast IPCP in
the sources, to get everything consistent with the documentation.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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