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charles17
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PostPosted: Tue Sep 02, 2014 10:30 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

VinzC wrote:
Basic configuration

Install Roy Marples' dhcpcd with zeroconf support:
Code:
USE=zeroconf emerge -a dhcpcd

It is of course best to add the USE flag to your favourite /etc/portage/package.use file.
Zeroconf has gone (net-misc/dhcpcd-6.4.3). Will this guide still work, even without zeroconf?
Also, I am wondering why Gentoo handbook hasn't yet adopted this simplified setup.
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PostPosted: Tue Sep 02, 2014 10:36 am    Post subject: Reply with quote

I use that setup without zeroconf support, and it rocks.
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PostPosted: Tue Sep 02, 2014 10:37 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

charles17 wrote:
Also, I am wondering why Gentoo handbook hasn't yet adopted this simplified setup.

That is a good question.
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PostPosted: Wed Sep 03, 2014 12:19 pm    Post subject: Reply with quote

charles17 wireless problem moved here
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PostPosted: Wed Sep 03, 2014 1:16 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

charles17 wrote:
Zeroconf has gone (net-misc/dhcpcd-6.4.3). Will this guide still work, even without zeroconf?

dhcp ebuild wrote:
dhcpcd has zeroconf support active by default.

Means Zeroconf may have its USE flag gone but it's now built-in. It can be disabled with -L command line switch however. See http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-misc/dhcpcd/dhcpcd-6.4.3.ebuild?view=markup .
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PostPosted: Wed Sep 03, 2014 4:08 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

Just put this wonderful guide on a wiki page. VPN interfaces and DNS resolution still missing there.
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PostPosted: Wed Sep 03, 2014 4:58 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

charles17 wrote:
Just put this wonderful guide on a wiki page. VPN interfaces and DNS resolution still missing there.

Awesome. :D
The part about wpa_supplicant's ctrl_interface (see https://forums.gentoo.org/viewtopic-p-7610948.html#7610948) should probably be mentioned.
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PostPosted: Thu Sep 04, 2014 6:44 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

charles17 wrote:
Just put this wonderful guide on a wiki page. VPN interfaces and DNS resolution still missing there.

8)

As for VPN I kept having some weirdness (I've always used pon/poff for my VPN connections) along with openresolv and dnsmasq. Every now and then remote name servers failed to register with openresolv. From the couple of times I used pon/poff lately the problem doesn't happen.

This said VPN configuration is not that straightforward as there are many ways to implement a VPN connection, with or without flexible DNS resolution, with or without name caching, with or without mDNSResponder... My typical configuration is openresolv, dnsmasq and pptpclient plus some customized if-up scripts. So this is but as simple as this dhcpcd tutorial.

I would say VPN interfaces and dhcpcd are irrelevant in the end. Just teach dhcpcd to stay away from VPN interfaces (which configuration is usually dictated by the remote server) and that's it. Then you can plug in any VPN management you like. DNS resolution along with VPN is another dedicated topic IMHO.
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PostPosted: Thu Sep 04, 2014 8:05 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

Dr.Willy wrote:
The part about wpa_supplicant's ctrl_interface (see https://forums.gentoo.org/viewtopic-p-7610948.html#7610948) should probably be mentioned.
Done. Next question:
How are the network dependant services like ntpd, fetchmail sshd handled? Would dhcpcd start/stop them or do we need to have them in runlevel default?
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PostPosted: Fri Sep 05, 2014 12:58 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

charles17 wrote:
Dr.Willy wrote:
The part about wpa_supplicant's ctrl_interface (see https://forums.gentoo.org/viewtopic-p-7610948.html#7610948) should probably be mentioned.
Done. Next question:
How are the network dependant services like ntpd, fetchmail sshd handled? Would dhcpcd start/stop them or do we need to have them in runlevel default?


Not currently no.

Someone, like say an OpenRC dev needs to make a dhcpcd hook re-entrant so it goes inactive -> active ->inactive when no interfaces a running.
Still, for ntpd and sshd they generally bind to the wildcard address so it doesn't matter if there's a working IP or it changes, it still works.
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PostPosted: Fri Sep 05, 2014 1:20 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
Not currently no.

Someone, like say an OpenRC dev needs to make a dhcpcd hook re-entrant so it goes inactive -> active ->inactive when no interfaces a running.
Still, for ntpd and sshd they generally bind to the wildcard address so it doesn't matter if there's a working IP or it changes, it still works.
I was wondering because debugging dhcpcd-hooks/50-ntp.conf gave me output with
Code:
++ eval service_condcommand ntpd restart '&'
+++ service_condcommand ntpd restart
But this seems not to be doing anything.
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PostPosted: Fri Sep 05, 2014 1:45 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
charles17 wrote:
Dr.Willy wrote:
The part about wpa_supplicant's ctrl_interface (see https://forums.gentoo.org/viewtopic-p-7610948.html#7610948) should probably be mentioned.
Done. Next question:
How are the network dependant services like ntpd, fetchmail sshd handled? Would dhcpcd start/stop them or do we need to have them in runlevel default?


Not currently no.

Someone, like say an OpenRC dev needs to make a dhcpcd hook re-entrant so it goes inactive -> active ->inactive when no interfaces a running.
Still, for ntpd and sshd they generally bind to the wildcard address so it doesn't matter if there's a working IP or it changes, it still works.


Especially on a dual-homed server, but sometimes even on my clients, I don't like to bind to the wildcard - I like to know where I'm listening. I'm quite interested in better OpenRC support of this way of running dhcpcd.
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PostPosted: Fri Sep 05, 2014 1:50 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

depontius wrote:
Especially on a dual-homed server, but sometimes even on my clients, I don't like to bind to the wildcard - I like to know where I'm listening. I'm quite interested in better OpenRC support of this way of running dhcpcd.


Silly question then - what is the expected result IF the IP address changes at all? I assume you have dhcpcd hooks in place to insert the IP to listen on into your service configs ;)
And if it doesn't change, why are you running a DHCP client? :)
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PostPosted: Fri Sep 05, 2014 2:34 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
depontius wrote:
Especially on a dual-homed server, but sometimes even on my clients, I don't like to bind to the wildcard - I like to know where I'm listening. I'm quite interested in better OpenRC support of this way of running dhcpcd.


Silly question then - what is the expected result IF the IP address changes at all? I assume you have dhcpcd hooks in place to insert the IP to listen on into your service configs ;)
And if it doesn't change, why are you running a DHCP client? :)


I've done both, on different systems. On my home systems I'm not fussy once I'm inside my LAN, so I let the wildcards happen. However on my home LAN I use dhcp for central administration purposes. My name/IP mapping is only in my BIND zone files, and my name/MAC mapping is only in my dhcpd.conf. I can control all of that from my server, and clients remain dumb. On my laptops I'm much fussier, and I tweak things quite a bit depending on what network I'm attached to. The laptop runs the corporate image, and that means RH with network-manage, so I'm using those hooks. (Though I did dual-boot Gentoo on the previous corporate laptop, before they changed the security rules, and then I used the dhcpcd hooks.) Whenever I get my own personal laptop, I'll use the dhcpcd hooks again.

One side... I'm being somewhat paranoid based on the network I connect to - on "unknown" networks I wind up with no listening ports other than dhcpcd itself. But even whenI connect to my home or work networks, how do I know they're really my home or work networks, or someone setting up a dhcp server to deliver the expected IP, tricking me into starting some services? I've not come up with a good way to handle this one that wouldn't take a bunch of software infrastructure.
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PostPosted: Fri Sep 05, 2014 2:44 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

depontius wrote:
One side... I'm being somewhat paranoid based on the network I connect to - on "unknown" networks I wind up with no listening ports other than dhcpcd itself. But even whenI connect to my home or work networks, how do I know they're really my home or work networks, or someone setting up a dhcp server to deliver the expected IP, tricking me into starting some services? I've not come up with a good way to handle this one that wouldn't take a bunch of software infrastructure.


Uh, DHCP authentication? (not well supported by DHCP servers, but dhcpcd supports it).
http://tools.ietf.org/html/rfc3118
It's in the DHCPv6 standard as well which dhcpcd supports.

Maybe IEEE802.11 authentication on the switched port or WPA PSK?

All valid solutions.
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PostPosted: Fri Sep 05, 2014 3:16 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
depontius wrote:
One side... I'm being somewhat paranoid based on the network I connect to - on "unknown" networks I wind up with no listening ports other than dhcpcd itself. But even whenI connect to my home or work networks, how do I know they're really my home or work networks, or someone setting up a dhcp server to deliver the expected IP, tricking me into starting some services? I've not come up with a good way to handle this one that wouldn't take a bunch of software infrastructure.


Uh, DHCP authentication? (not well supported by DHCP servers, but dhcpcd supports it).
http://tools.ietf.org/html/rfc3118
It's in the DHCPv6 standard as well which dhcpcd supports.

Maybe IEEE802.11 authentication on the switched port or WPA PSK?

All valid solutions.


I can do stuff like that for my home network, and will look into it. The corporate network is so silly-backwards you wouldn't believe it. But it's their network, their laptop, their software, and they insist that I use it as provided. Oh well.
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PostPosted: Sun Sep 07, 2014 11:20 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
Someone, like say an OpenRC dev needs to make a dhcpcd hook re-entrant so it goes inactive -> active ->inactive when no interfaces a running.

Hmm what do you want to happen? Also, I wish you were still in charge of openrc; I reviewed the commit history a while back, and it's gone completely downhill since you left. Some of the sh is simply painful to look at (as in: embarrassing), and there's been no other real code, apart from one patch from a user who like many others should have been nurtured into a developer on the project but wasn't. Oh an aborted attempt to remove an API, which I advised strongly against before it happened, and it was reverted a few weeks later: no other actual code, since you left. Disappointing, to say the least.
Quote:
Still, for ntpd and sshd they generally bind to the wildcard address so it doesn't matter if there's a working IP or it changes, it still works.

Heh indeed. Funny how the old ideas still work.. just like a tap, or a plug still does the job. ;-)
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PostPosted: Sun Sep 07, 2014 7:49 pm    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

steveL wrote:
Hmm what do you want to happen?


Me? Nothing, I'm not entirely sure of the usefulness of this feature.
You either have complex scripts to update the IP services bind to (heh, like my hook scripts in dhcpcd - good examples there!) or you have the IP hard coded and made the running of DHCP for central IP management kinda redundant.

Saying that, I have made this patch upstream:
http://roy.marples.name/projects/dhcpcd/ci/1113488b81673c23b3b079e1fc5ea6df5ffc0ee5?sbs=0

Which will aid the creation of a hook. I've even provided a rough idea of how it would look here:
https://bugs.gentoo.org/show_bug.cgi?id=522206#c1

Quote:
Also, I wish you were still in charge of openrc; I reviewed the commit history a while back, and it's gone completely downhill since you left. Some of the sh is simply painful to look at (as in: embarrassing), and there's been no other real code, apart from one patch from a user who like many others should have been nurtured into a developer on the project but wasn't. Oh an aborted attempt to remove an API, which I advised strongly against before it happened, and it was reverted a few weeks later: no other actual code, since you left. Disappointing, to say the least.
Quote:
Still, for ntpd and sshd they generally bind to the wildcard address so it doesn't matter if there's a working IP or it changes, it still works.

Heh indeed. Funny how the old ideas still work.. just like a tap, or a plug still does the job. ;-)


Sorry that you think it's gone down hill, but I really don't have the time to maintain it anymore. All my free time goes into dhcpcd, dhcpcd-ui (working on a dhcpcd-qt port as we speak).
If you feel that passionate about it, then join the team and help out!
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PostPosted: Mon Sep 08, 2014 9:11 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
Saying that, I have made this patch upstream:
http://roy.marples.name/projects/dhcpcd/ci/1113488b81673c23b3b079e1fc5ea6df5ffc0ee5?sbs=0

Which will aid the creation of a hook. I've even provided a rough idea of how it would look here:
https://bugs.gentoo.org/show_bug.cgi?id=522206#c1
Will this interrupt ("backgrounding") and reactivate those network dependant services like openrc/netifrc does?
Then those services would need to be in runlevel default (using "need net" or "use net")?

I'd like to try it but need some help. What is the easiest way of emerging dhcpcd with this patch?
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PostPosted: Mon Sep 08, 2014 9:25 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

charles17 wrote:
I'd like to try it but need some help. What is the easiest way of emerging dhcpcd with this patch?


Install the 9999 version.
That will also install Fossil so you can pull the latest dhcpcd code from my repository.
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PostPosted: Mon Sep 08, 2014 10:54 am    Post subject: Re: TIP: Complete network stack without net.* scripts Reply with quote

UberLord wrote:
Install the 9999 version.
That will also install Fossil so you can pull the latest dhcpcd code from my repository.
Tried that but getting errors, see pastebin. How to proceed?
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PostPosted: Mon Sep 08, 2014 12:47 pm    Post subject: Reply with quote

Can you pastebin your copy of /usr/include/linux/if_link.h please?
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PostPosted: Mon Sep 08, 2014 1:23 pm    Post subject: Reply with quote

Here comes pastebin of my if_link.h.
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PostPosted: Mon Sep 08, 2014 1:58 pm    Post subject: Reply with quote

Fixed. Maybe one day Linux developers will actually allow #ifdef to work on newly added code, but I'm not holding my breath.
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PostPosted: Mon Sep 08, 2014 2:39 pm    Post subject: Reply with quote

Thanks for your fast action. Compilation works and I did a first test with "99-openrc".
Code:
set -x
# https://bugs.gentoo.org/show_bug.cgi?id=522206#c1

if $if_oneup && if_ipwaited then;
   mark_service_started dhcpcd
else
   mark_service_inactive dhcpcd
fi
What is that syntax error it shows me?
Quote:
$ su -c "dhcpcd -dB"
Password:
dhcpcd[6481]: version 6.4.3 starting
dhcpcd[6481]: udev: starting
dhcpcd[6481]: dev: loaded udev
dhcpcd[6481]: enp2s14: if_disable_autolinklocal: Invalid argument
dhcpcd[6481]: wlp8s0: if_disable_autolinklocal: Invalid argument
dhcpcd[6481]: enp2s14: executing `/lib/dhcpcd/dhcpcd-run-hooks' PREINIT
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: syntax error near unexpected token `else'
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: `else'
+ for hook in /etc/dhcpcd.enter-hook '/lib/dhcpcd/dhcpcd-hooks/*' /etc/dhcpcd.exit-hook
+ for skip in '$skip_hooks'
+ case "$hook" in
+ '[' -f /etc/dhcpcd.exit-hook ']'
dhcpcd[6481]: enp2s14: executing `/lib/dhcpcd/dhcpcd-run-hooks' NOCARRIER
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: syntax error near unexpected token `else'
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: `else'
+ for hook in /etc/dhcpcd.enter-hook '/lib/dhcpcd/dhcpcd-hooks/*' /etc/dhcpcd.exit-hook
+ for skip in '$skip_hooks'
+ case "$hook" in
+ '[' -f /etc/dhcpcd.exit-hook ']'
dhcpcd[6481]: wlp8s0: executing `/lib/dhcpcd/dhcpcd-run-hooks' PREINIT
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: syntax error near unexpected token `else'
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: `else'
+ for hook in /etc/dhcpcd.enter-hook '/lib/dhcpcd/dhcpcd-hooks/*' /etc/dhcpcd.exit-hook
+ for skip in '$skip_hooks'
+ case "$hook" in
+ '[' -f /etc/dhcpcd.exit-hook ']'
dhcpcd[6481]: wlp8s0: executing `/lib/dhcpcd/dhcpcd-run-hooks' CARRIER
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: syntax error near unexpected token `else'
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: `else'
+ for hook in /etc/dhcpcd.enter-hook '/lib/dhcpcd/dhcpcd-hooks/*' /etc/dhcpcd.exit-hook
+ for skip in '$skip_hooks'
+ case "$hook" in
+ '[' -f /etc/dhcpcd.exit-hook ']'
dhcpcd[6481]: enp2s14: waiting for carrier
dhcpcd[6481]: DUID 00:01:00:01:0f:02:bb:59:00:1b:77:b1:c8:8e
dhcpcd[6481]: wlp8s0: IAID 77:b1:c8:8e
dhcpcd[6481]: wlp8s0: delaying IPv6 router solictation for 0.4 seconds
dhcpcd[6481]: wlp8s0: delaying DHCP for 0.4 seconds
ntpd | * Stopping ntpd ... [ ok ]
ntpd | * Starting ntpd ... [ ok ]
dhcpcd[6481]: wlp8s0: reading lease `/var/lib/dhcpcd/dhcpcd-wlp8s0.lease'
dhcpcd[6481]: wlp8s0: rebinding lease of 192.168.178.23
dhcpcd[6481]: wlp8s0: sending REQUEST (xid 0x1742fc50), next in 4.2 seconds
dhcpcd[6481]: wlp8s0: soliciting an IPv6 router
dhcpcd[6481]: wlp8s0: sending Router Solicitation
dhcpcd[6481]: wlp8s0: acknowledged 192.168.178.23 from 192.168.178.1
dhcpcd[6481]: wlp8s0: leased 192.168.178.23 for 864000 seconds
dhcpcd[6481]: wlp8s0: renew in 432000 seconds, rebind in 756000 seconds
dhcpcd[6481]: wlp8s0: IP address 192.168.178.23/24 already exists
dhcpcd[6481]: wlp8s0: adding route to 192.168.178.0/24
dhcpcd[6481]: wlp8s0: adding default route via 192.168.178.1
dhcpcd[6481]: wlp8s0: writing lease `/var/lib/dhcpcd/dhcpcd-wlp8s0.lease'
dhcpcd[6481]: wlp8s0: executing `/lib/dhcpcd/dhcpcd-run-hooks' REBOOT
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: syntax error near unexpected token `else'
/lib/dhcpcd/dhcpcd-hooks/99-openrc: line 6: `else'
+ for hook in /etc/dhcpcd.enter-hook '/lib/dhcpcd/dhcpcd-hooks/*' /etc/dhcpcd.exit-hook
+ for skip in '$skip_hooks'
+ case "$hook" in
+ '[' -f /etc/dhcpcd.exit-hook ']'
dhcpcd[6481]: wlp8s0: sending ARP announce (1 of 2), next in 2.0 seconds
ntpd | * Stopping ntpd ... [ ok ]
ntpd | * Starting ntpd ... [ ok ]
dhcpcd[6481]: wlp8s0: sending ARP announce (2 of 2)
dhcpcd[6481]: wlp8s0: sending Router Solicitation
dhcpcd[6481]: wlp8s0: sending Router Solicitation
dhcpcd[6481]: wlp8s0: sending Router Solicitation
dhcpcd[6481]: wlp8s0: no IPv6 Routers available
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