Show pagesourceOld revisionsBacklinksBack to top × Table of Contents Multicast DNS Daemon umdns Alternatives Config File Browsing announced services Issues/Bugs Announcing local services Multicast DNS Daemon umdns This is early stage documentation, but at least attempts to cover some basic usage, and bring umdns usage out of the dark. mDNS, also known as Bonjour or zero-configuration networking, enables automatic discovery of computers, devices, and services on IP networks. It is an internet standard documented in RFC6762. The umdns package provides a compact implementation of this standard, well integrated with the OpenWrt system environment. In particular, almost all interaction with the daemon is via ubus. Alternatives mdnsd - provided by Apple's mDNSResponder package avahi-* - A fairly full, but quite large implementation Config File /etc/config/umdns config umdns option jail 1 list network lan list network dmz #Provides visibility into both networks, but does not act as a repeater Browsing announced services $ ubus call umdns update # wait a second or two $ ubus call umdns browse # big json dump example... .... "_printer._tcp": { "HP\\032Color\\032LaserJet\\032CP2025dn\\032(28A6CC)": { "port": 515, "txt": "txtvers=1", "txt": "qtotal=1", "txt": "rp=RAW", "txt": "ty=HP Color LaserJet CP2025dn", "txt": "product=(HP Color LaserJet CP2025dn)", "txt": "priority=50", "txt": "adminurl=http:\/\/NPI28A6CC.local.", "txt": "Transparent=T", "txt": "Binary=T", "txt": "TBCP=T" }, "HP\\032LaserJet\\032P3010\\032Series\\032[46A14F]": { "port": 515, "txt": "txtvers=1", "txt": "qtotal=4", "txt": "rp=RAW", "txt": "pdl=application\/postscript,application\/vnd.hp-PCL,application\/vnd.hp-PCLXL", "txt": "ty=HP LaserJet P3010 Series", "txt": "product=(HP LaserJet P3010 Series)", "txt": "usb_MFG=Hewlett-Packard", "txt": "usb_MDL=HP LaserJet P3010 Series", "txt": "priority=52", "txt": "adminurl=http:\/\/NPI46A14F.local." }, .... $ ubus call umdns hosts #Show hosts discovered via mDns "SteakPrinter.local": { "ipv4": "192.168.1.159" }, "Upstairs.local": { "ipv4": "192.168.1.151" }, Issues/Bugs IP addresses are missing. TXT records aren't valid json in the dump, so jsonfilter can't be used. How long is data cached? What causes it to update? No idea. Announcing local services 'umdns' scans all the services listed in 'ubus' (ubus call service list) and looks for 'mdns' objects in their data object. You can view this more selectively for example with: # ubus call service list | jsonfilter -e '@[*].instances[*].data.mdns' { "ssh_22": { "service": "_ssh._tcp.local", "port": 22, "txt": [ "daemon=dropbear" ] } } Here we can see that ssh is being advertised locally. If you want to advertise your own service, your service needs to (*AT THE TIME OF WRITING* 2017-07-11) be a procd managed service. You can use the procd_add_mdns call to provide a basic definition. procd_open_instance .... procd_add_mdns <service> <proto> <port> [<textkey=textvalue> ... ] ... procd_close_instance As an example, the following call procd_add_mdns "hoho" "tcp" "99" "daemon=special" "colour=fuschia" will result in advertising _hoho._tcp.local with two text records. If you wish to create a more complicated mdns information block, see procd_add_mdns_service in /lib/functions/procd.sh but be warned that umdns probably can't automatically support everything you can represent in json. This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.OKMore information about cookies Last modified: 2020/11/28 19:03by mikeasolo