Re: [gpsd-users] GPSD on Debian 10 (buster): allowing other hosts to access gpsd

[Charles Curley]

On Wed, 18 Sep 2019 12:07:00 -0700
"Gary E. Miller" <address@hidden> wrote:

> Yo Charles!
> 
> On Wed, 18 Sep 2019 10:19:35 -0600
> Charles Curley <address@hidden> wrote:
> 
> > I have the Debian packaged gpsd (version 3.17-7 [Yes, I know:
> > ancient]) on Debian 10 (buster). It runs just fine and dandy,  
> 
> Modulo a bunch of CVE...
> 
> > except
> > I cannot access it from another computer. I have:  
> 
> Uh, oh.
> 
> > * Opened the firewall to allow packets in on gpsd's port, 2947.
> >   Firewall logging reports no hits on that port.  
> 
> How did you verify that?  Did you try an nmap remotely?
>       nmap -p 2947 xx.xx.xx.xx.

root@orca:~# nmap -p 2947 hawk
Starting Nmap 7.70 ( https://nmap.org ) at 2019-09-18 17:57 MDT
Nmap scan report for hawk (192.168.100.6)
Host is up (0.0013s latency).
rDNS record for 192.168.100.6: hawk.localdomain

PORT     STATE  SERVICE
2947/tcp closed gpsd
MAC Address: 30:5A:3A:81:83:79 (Asustek Computer)

Nmap done: 1 IP address (1 host up) scanned in 0.60 seconds
root@orca:~# 


However, syslog on hawk does not show any packets hitting the firewall.

> 
> Did you look at netstat?
>       netstat -apn | fgrep gpsd

root@hawk:/home/charles/versioned/gpsd# netstat -apn | fgrep gpsd
tcp        0      0 127.0.0.1:2947          127.0.0.1:56042         ESTABLISHED 
16423/gpsd          
unix  2      [ ACC ]     STREAM     LISTENING     8442447  1/init               
/var/run/gpsd.sock
unix  3      [ ]         STREAM     CONNECTED     8597869  16423/gpsd           
root@hawk:/home/charles/versioned/gpsd# 



> 
> > * Copied gpsd.socket to /etc/systemd/system, and edited it to allow
> >   access from all interfaces:  
> 
> Oh.  Then you realize you are not running gpsd, you are running
> systemd which is hijacking port 2947...

gpsd is running. I have a receiver running, and I get reports on
multiple clients.

> 
> I'll bet you have a systemd problem.  Have you tried without
> systemdumb?

Good luck getting rid of systemd on Debian. Like kudzu or bureaucracy,
it takes over everything. I need to hornswaggle it into doing what I
want.



> 
> > * Edited /etc/default/gpsd to include the -G option:  
> 
> And why not the "-n" option?

Possibly because I didn't see that it was relevant to the matter at
hand? I already have multiple clients on hawk getting data from gpsd.

In any case when I add the n option ("-Gn"), it shows up in ps's
output, but still no joy. Nmap still reports the port closed.


> 
> > My clients find gpsd and the gps receiver on the local host, hawk.
> > On another computer, I cannot get to gpsd on hawk. Ping works.
> > Telnet reports that it is unable to connect. Xgps on the other
> > computer reports, "gpsd is not running."
> > 
> > What am I doing wrong?  
> 
> You are running systemdumb.  Try the above 3 things and see what you
> see.
> 
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>       address@hidden  Tel:+1 541 382 8588
> 
>           Veritas liberabit vos. -- Quid est veritas?
>     "If you can't measure it, you can't improve it." - Lord Kelvin



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