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[Bug 1890276] Re: inetd does not answer broadcast requests

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# working env: xenial (without inetd)

*:111                               *:*          users:(("rpcbind",pid=6679,fd=6))
*:919                               *:*          users:(("rpcbind",pid=6679,fd=7))
*:998                               *:*          users:(("rpc.rstatd",pid=6759,fd=3))

(c)rafaeldtinoco@xenial:~$ sudo tcpdump -i eth0 -n
12:23:59.243382 IP 10.250.97.142.38369 > 10.250.97.255.111: UDP, length 100
12:23:59.245356 IP 10.250.97.213.919 > 10.250.97.142.38369: UDP, length 140

# working env: bionic (without inetd)

0.0.0.0:111                   0.0.0.0:*          users:(("rpcbind",pid=1073,fd=6))                                                                    
0.0.0.0:825                   0.0.0.0:*          users:(("rpcbind",pid=1073,fd=7))
0.0.0.0:752                   0.0.0.0:*          users:(("rpc.rstatd",pid=10753,fd=3))
                                                                                                                                 
(c)rafaeldtinoco@bionic:~$ sudo tcpdump -i eth0 -n
11:49:40.673843 IP 10.250.97.227.38276 > 10.250.97.255.111: UDP, length 100
11:49:40.677280 IP 10.250.97.142.825 > 10.250.97.227.38276: UDP, length 140

----

# not-working env: eoan (without inetd)

0.0.0.0:111                   0.0.0.0:*          users:(("rpcbind",pid=2799,fd=5),("systemd",pid=1,fd=32))                                           
0.0.0.0:901                   0.0.0.0:*          users:(("rpc.rstatd",pid=2846,fd=3))  

(c)rafaeldtinoco@eoan:~$ sudo tcpdump -i eth0 -n
11:54:17.931899 IP 10.250.97.227.48295 > 10.250.97.255.111: UDP, length 100

# not-working env: focal (without inetd)
                                                              
0.0.0.0:111                   0.0.0.0:*          users:(("rpcbind",pid=6184,fd=5),("systemd",pid=1,fd=42))                                           
127.0.0.1:862                 0.0.0.0:*          users:(("rpc.statd",pid=6198,fd=5))
0.0.0.0:39800                 0.0.0.0:*          users:(("rpc.statd",pid=6198,fd=8))  

note: systemd has rpcbind socket, removing that variable had no effect.

----

But I noticed rpcbind is running as _rpc user in the non-working
environments.

There was a major change in rpcbind from affected versions.

And… finally:

(c)rafaeldtinoco@groovy:~$ rup
bionic.lxd            12:56 up             18:31, load 0.22 0.16 0.10
groovy.lxd            12:56 up             12:51, load 0.22 0.16 0.10
xenial.lxd            12:56 up             18:26, load 0.22 0.16 0.10

I had to replace groovy rpcbind with rpcbind from bionic.

Now, in some other time, I'll have to check what changes to rpcbind (a
lot) made this happen.


** Summary changed:

- inetd does not answer broadcast requests
+ rpcbind changes after bionic broke rup broadcast feature

** Also affects: rpcbind (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: openbsd-inetd (Ubuntu)

** No longer affects: openbsd-inetd (Ubuntu Xenial)

** No longer affects: openbsd-inetd (Ubuntu Eoan)

** No longer affects: openbsd-inetd (Ubuntu Bionic)

** No longer affects: openbsd-inetd (Ubuntu Focal)

** Changed in: rpcbind (Ubuntu)
       Status: New => Confirmed

** Changed in: rpcbind (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: rpcbind (Ubuntu Eoan)
       Status: New => Confirmed

** Changed in: rpcbind (Ubuntu Bionic)
       Status: New => Fix Released

** Changed in: rpcbind (Ubuntu Xenial)
       Status: New => Fix Released

** Changed in: rpcbind (Ubuntu)
   Importance: Undecided => Medium

** Changed in: rpcbind (Ubuntu)
     Assignee: (unassigned) => Rafael David Tinoco (rafaeldtinoco)

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https://bugs.launchpad.net/bugs/1890276

Title:
  rpcbind changes after bionic broke rup broadcast feature

Status in rpcbind package in Ubuntu:
  Confirmed
Status in rpcbind source package in Xenial:
  Fix Released
Status in rpcbind source package in Bionic:
  Fix Released
Status in rpcbind source package in Eoan:
  Confirmed
Status in rpcbind source package in Focal:
  Confirmed

Bug description:
  When I call inetd services rup or rusersd in broadcast mode, I get
  answers from my Ubuntu 18.04 machines only. An Ubuntu 20.04 machine
  (here rzpc101) answers only when addressed directly:

  zierke@rzpc100$ rup
  rzpc100.informatik.un 14:02 up  10 days,    8:30, load 0.52 0.38 0.23
  rzlinux.informatik.un 14:02 up    1 day,    3:12, load 0.04 0.09 0.03
  rzpc174.informatik.un 14:02 up   4 days,   19:28, load 0.00 0.01 0.00
  ^C
  zierke@rzpc100$ rup rzpc101
  rzpc101.informatik.un 14:02 up              3:29,   3 users, load 0.33 0.32 0.15
  zierke@rzpc100$ rusers
  rzpc100.informatik.u zierke zierke 
  rzlinux.informatik.u zierke zierke zierke 
  ^C
  zierke@rzpc100$ rusers rzpc101
  rzpc101.informatik.u zierke zierke zierke 

  zierke@rzpc101$ lsb_release -rd
  Description:	Ubuntu 20.04.1 LTS
  Release:	20.04

  zierke@rzpc100$ lsb_release -rd
  Description:	Ubuntu 18.04.4 LTS
  Release:	18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: openbsd-inetd 0.20160825-4build1
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Aug  4 14:03:06 2020
  InstallationDate: Installed on 2020-07-24 (11 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: openbsd-inetd
  UpgradeStatus: No upgrade log present (probably fresh install)

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