2024-06-13 19:21:56 +00:00
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# Assumptions
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- There is at least one mesh node.
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- Meshes are not built through collusion, i.e., each person setting up a
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node does not do so knowing that others are as well.
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- Mesh nodes are able to broadcast the existence of services they run
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("I run a microblog!")
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- Services can be activated on a node (implying that their presence will
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be announced) or deactivated (implying that their presence will not be
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announced)
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- Mesh nodes continually listen for announcements of services from
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neighboring mesh nodeds
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- Mesh nodes maintain directories of services running on neighboring
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mesh nodes
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- ...except when a service is designed to automatically federate with
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others of a like type (i.e., announcements of content from one will
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automatically be incorporated into cached announcements on the node)
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- Clients neither broadcast nor listen for service announcements
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- Smartphones
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- MP3 players
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- Computers not running Byzantium
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# Existing protocols
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- Avahi/ZeroConf/mDNS
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- Included in Porteus Linux
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- Host can publish running services
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- Host can be informed of services running on other hosts
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- User does not have to specifically configure any of this
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- Host admins may have to configure this
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- Bindings for multiple languages are available
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- Protocol in a nutshell:
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- Ad-hoc DHS over IP multicast (224.0.0.251, port 5353/UDP)
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- Each node has a resource record for each service
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- SRV
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- TXT
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- PTR
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- Types documented in /usr/share/avahi/service-types on
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Windbringer. File is part of Avahi on all systems.
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- HAS NOTHING TO DO WITH dnsmasq!
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- Resolution is done by the host running an Avahi implementation -
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broadcast a resolution request to the multicast domain and listen
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for a response
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- Node needs to have its hostname set (machinename.local)
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- Ignores point-to-point links by default. Add
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"allow-point-to-point=yes" in avahi-daemon.conf
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- Do mesh interfaces have the POINTTOPOINT flag?
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- wide-area functionality seems relevant to a mesh.
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- deny-interfaces=eth0 in avahi-daemon.conf may be necessary to
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prevent mDNS traffic from going over gateways.
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- avahi-daemon implements service announcement and listening, and
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interfaces with Avahi-enabled client apps.
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- avahi-dnsconfd connects to avahi-daemon and keeps track of unicast
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DNSes detected.
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- Read manage for avahi-daemon.conf!
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- Will need an /etc/avahi/services/foo.service XML file for each
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service offered by a node.
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- Manpage avahi.service(5) documents all required XML tags.
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- Each mesh node will have a list of all mesh nodes it's heard from in
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recent memory. This can be used to build the directory of
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neighboring services.
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<!-- -->
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- XMPP service discovery
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- Message oriented, based on XML
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- Jabber's protocol.
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- [XEP-0030](http://xmpp.org/extensions/xep-0030.html)
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- Used for discovering other XMPP entities/services implemented by
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XMPP servers.
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- Could be used for discovering and federating apps running on other
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nodes (i.e., distributed microblog).
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# Notes
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- KDE comes with something called Personal File Server, which allows
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arbitrary directories to be made available over HTTP(S?). It's
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Avahi-enabled. KDE is packagedwith Porteus. There's our file dump.
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- avahi-bookmarks allows the user to access HTTP resources with a web
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browser.
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- nss-mdns should be enabled in /etc/nssswitch.conf.
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2024-06-13 01:48:44 +00:00
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[Category:Byzantium](Category:Byzantium "wikilink")
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