mdns discovery of sessions

[totaam]

Issue migrated from trac ticket # 1332

component: core | priority: major | resolution: fixed

2016-10-06 08:43:21: antoine created the issue

---

Make mdns more useful.

It should be easier to see which sessions are available on the LAN.
Tools like avahi-discover aren't very user friendly and don't know about our service type.. (#731)

[totaam]

2016-10-06 09:01:28: antoine changed owner from antoine to afarr

[totaam]

2016-10-06 09:01:28: antoine commented

---

• r14008 cleanup, move mdns bits to a sub-package
• r14009 + r14010: expose the server uuid in the mdns data
• r14011 + r14013: "list-mdns" subcommand
• r14012 add support for building --without-mdns

Notes:

• there is no support for OSX or win32 yet (mdns listener support for osx and win32 #1333)
• a GUI would be nice: mdns GUI launcher #1334

---

Example:

$ xpra start --bind-tcp=0.0.0.0: --mdns=yes --session-name=hello

$ xpra list-mdns
Looking for xpra services via mdns
* user 'antoine' on 'desktop.local'
 session 'hello', uuid=bce14c3aeed34c7892aea576ea8d78a8
 + ssh endpoint on host 192.168.1.200, port 22, interface eth1
   "ssh/[email protected]:22/2"
 + tcp endpoint on host 192.168.1.200, port 14500, interface eth1
   "tcp/[email protected]:14500/2"
1 service found

$ xpra info | grep uuid
server.uuid=bce14c3aeed34c7892aea576ea8d78a8

(works equally well for ssl sockets and the quoted uri should be usable as-is)

@afarr: mostly a FYI.

[totaam]

2016-10-12 07:18:30: antoine commented

---

Pull request for avahi: add Xpra service type

[totaam]

2016-10-24 20:25:16: maxmylyn changed status from new to closed

[totaam]

2016-10-24 20:25:16: maxmylyn set resolution to fixed

[totaam]

2016-10-24 20:25:16: maxmylyn commented

---

Neat. Closing.

Note: if a server is on the non-standard port, this will not find it. Makes sense(because one would be deviating from the standard, and it'd be unreasonable to try to check every single port), but just wanted to note it for future reference.