[lldb-dev] Problems with remote debugging connections

Vince Harron vharron at google.com
Wed Jan 7 18:07:38 PST 2015

> Isn't that related to why the above case 1 is failing?

Related in that they're both using a passed hostname for making/allowing a
connection but different in that they are different spots in the code.

On Wed, Jan 7, 2015 at 5:45 PM, Greg Clayton <gclayton at apple.com> wrote:

> > On Jan 7, 2015, at 4:47 PM, Vince Harron <vharron at google.com> wrote:
> >
> > Hi all,
> >
> > I'm having a couple of problems with remote debugging.
> >
> > 1) lldb unable to connect to lldb-gdbserver
> > when lldb connects to platform, platform sends back a hostname that is
> supposed to be used for connection to lldb-gdbserver.  Unfortunately, for
> my VM targets without DNS entries, the hostnames they return are useless.
> A much better strategy is to re-use the hostname in the platform connect
> url to connect to the lldb-gdbserver.
> That could easily work. We also could provide a lldb-platform argument
> that says what hostname to connect back to instead of itself, but that is
> more work and probably not needed. I can't think of any reason we would not
> just be able to use the hostname used to connect to the platform...
> >
> > 2) lldb-gdbserver refuses connection from lldb.  Similarly,
> qLaunchGDBServer includes a host name that lldb-gdbserver is allowed to
> accept connections from.  If, for whatever reason, my source host doesn't
> have a DNS entry, this will fail.
> Isn't that related to why the above case 1 is failing? What value is the
> platform sending back to LLDB in the above case?
> >
> > Also, if I platform connect to localhost, lldb-gdbserver will see the
> remote ip address as which will not to match the DNS lookup of my
> hostname.  A much better strategy is to just allow connections from the IP
> address that lldb-platform is currently communicating with.
> that is fine.
> >
> > I think these changes will work with all existing use cases and add many
> more use cases without compromising security.
> That sounds good.
> >
> > I'm working on these changes now.  I'm going to add the ability for a
> connection object to return either a remote hostname or a SocketAddress.
> >
> > Questions/concerns?
> There is so much spoofing that goes on when running things remotely and
> with virtual machines that this needs to be as powerful as we can make it.
> Feel free propose fixes and we can look at what you come up with. I will
> need to test with iOS when you have changes so I can make sure nothing
> breaks on our side. Let me know when you have something and I will test it.
> Greg


Vince Harron | Technical Lead Manager | vharron at google.com | 858-442-0868
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