Synapse in Lazarus on Linux with user privileges not working.
lazarus / 38-Networking and Web Programming

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toplek · 2015-08-11 13:51

Hi,

when I start Lazarus IDE from root account the PingSend.PingHost(host)
from Synapse library works properly, but when I start Lazarus IDE from
user account the PingSend.PingHost(host) gives all the time '-1'
result.

Lazarus version: 1.4.2
FPC, FPC-SRC version: 2.6.4
Synapse version: 4.0
OS: Debina 8.1 on Oracle VM

please help in solving this problem.
Piort Polok

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Thaddy · 2015-08-12 08:31

Is that computer also running a server? In that case the ping is
probably blocked both ways and ICMP is not allowed for user space
(rightfully so). This prevents ping flooding to a certain extend. Has
nothing to do with Lazarus or Synapse but with permissions. Note that
most serious server  distro's block ICMP by default for this reason.

Create a new user group for your application, add your app as a user
and give it "just enough education(rights) to perform" , i.e. network
access rights for ICMP. Nothing more plz.

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toplek · 2015-08-12 13:21

Thank you for the reply,

Yes, the compiler is running on server, I do not fully understand the
situation, I just moved code from Kylix do Lazarus and it stop to
work, also i'm able to ping from user shell command ... ?

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marcov · 2015-08-12 13:33

I don't know anything about the internals of Kylix, but try to strace
small programs in both to see where the difference is.

And I assume the Kylix binary run on the same computer and are not
setuid ?

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Thaddy · 2015-08-12 13:39

I strongly suggest you check your Kylix program permissions. Like
Marco said and I explained: this is a rights issue. I suspect a normal
-user - terminal ping will also fail unless you are running a terminal
as root.

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toplek · 2015-08-12 14:19

You are right, my wrong, Kylix has the same problem, it's all about
permision. Thank you for the help.