wpa_supplicant usage #397

Mausy5043 · 2016-03-28T09:34:31Z

Changes:

Put all networking related code together.
If config/wpa_supplicant.conf exists AND was used by the installer then copy it to the installed system in /etc/wpa_supplicant/ and add a reference to it in /etc/network/interfaces.
Changed the way of installing and starting wpa_supplicant so that it actually works.

This commit will allow the user to install AND use the target system in the absence of a wired ethernet connection, but in the presence of a WiFi network.

The user must configure the following (already existing) parameters:

drivers_to_load= supply the name of the module that must be loaded by the kernel for the hardware (WiFi dongle) used. E.g.: 8192cu.
ifname= supply the non-ethernet interface name. Normally you will use wlan0 here.

Additionally user must supply a file (config/wpa_supplicant.conf) containing a valid configuration. E.g.:

network={
ssid="pi3.1415926"
psk="AV3ry53cretPa55w0rdThatN00n3W!113verGue55"
key_mgmt=WPA-PSK
}

ref: https://w1.fi/cgit/hostap/plain/wpa_supplicant/wpa_supplicant.conf
(Please don't use the password suggested in the example above. It is not secure)

sync with V1.1.x

goranche · 2016-03-28T13:05:24Z

scripts/etc/init.d/rcS

-    fi
+# lo interface may already be there, so first check for it
+if ! grep -q "auto lo" /rootfs/etc/network/interfaces; then
+    echo "auto lo"                      >> /rootfs/etc/network/interfaces


please don't use weird alignment like this

Mausy5043 · 2016-03-31T17:11:37Z

bump

L870 won’t work because the installed system hasen’t been `apt-get update`d.

Mausy5043 · 2016-04-24T10:05:53Z

This PR fixes #175 which IMHO was never properly tested (due to lack of hardware for testing).
This PR solves #44 and #349.
This PR may be of help finding a solution for #52

EDIT: please note I've updated the description at the top.

goranche · 2016-05-07T19:44:39Z

scripts/etc/init.d/rcS

-    wpa_supplicant -B -Dnl80211,wext -c/bootfs/config/wpa_supplicant.conf -i$ifname >& /dev/null || fail
-    echo "OK"
+    echo "Starting wpa_supplicant... "
+    wpa_supplicant -B -Dnl80211 -c/bootfs/config/wpa_supplicant.conf -i$ifname


are nl80211 and wext the only two supported modules?

There's also wired.

But we don't need wpa_supplicant for wired connections 😉

😋 I meant for wireless... 😊

What's the reason for this change?
The whole idea of -Dnl80211,wext is to try nl80211 first and if that doesn't work, try wext.

It doesn't work with -Dnl80211,wext 😕 . It turned out during testing that it only worked if I tried them separately.

goranche · 2016-05-07T19:55:40Z

scripts/etc/init.d/rcS

@@ -1115,6 +1121,15 @@ if [ -e /bootfs/post-install.txt ]; then
    echo "================================================="
 fi

+# modify installed network settings
+if [ -f /rootfs/etc/wpa_supplicant/wpa_supplicant.conf ]; then
+    if [ $(grep "iface" /rootfs/etc/network/interfaces |grep -v "lo\|eth0" |wc -l) -ne 0 ]; then


please add spaces after the pipe characters (the actual pipes, not the character in the regex 😉 )

goranche · 2016-05-07T20:01:37Z

💭 maybe it would be better to check the interface name for wlan* instead of not eth0...
a possible problem I see is it anyone has additional non-wifi interfaces...

diederikdehaas · 2016-05-07T20:05:17Z

better to check the interface name for wlan* instead of not eth0

Ra-link devices get named ra* and those are wireless devices.
What do you mean with additional non-wifi interfaces (that could pose a problem)?

Mausy5043 · 2016-05-07T20:07:27Z

a possible problem I see is it anyone has additional non-wifi interfaces...

Let's cross that bridge when we get there.

goranche · 2016-05-07T20:11:58Z

What do you mean with additional non-wifi interfaces (that could pose a problem)?

I was thinking a bit too far ahead... this is a larger part of my interfaces file:

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

the code as is wouldn't create both wpa-conf entries... but on the other hand (this is where I didn't think it through) you can't really add multiple interfaces anyway, so... never mind 😉

goranche · 2016-05-07T20:12:35Z

Ra-link devices get named ra*

groan

diederikdehaas · 2016-05-07T20:13:02Z

scripts/etc/init.d/rcS

-        echo "wpa-conf /boot/config/wpa_supplicant.conf"
+# eth0 config
+echo "" >> /rootfs/etc/network/interfaces
+echo "auto $ifname" >> /rootfs/etc/network/interfaces


With wireless interfaces, you usually also want allow-hotplug $ifname as wireless devices are more likely to get unplugged and replugged, but also it will give a signal when the device is ready to be used by which the auto may already have passed.

goranche · 2016-05-07T20:16:07Z

I do have one more thing, though... if we install using WiFi, we don't create an entry for eth0...

I think that in this case we should create an entry with dhcp:

allow-hotplug eth0
iface eth0 inet dhcp

this way the ethernet port will still work if a cable is plugged in...

diederikdehaas · 2016-05-07T20:16:08Z

I'm not sure where to put it, so I'll just do it here.
The wireless part of my /e/n/i is as follows:

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

Note the manual value and the extra iface ... line at the bottom

goranche · 2016-05-07T20:19:36Z

Not the manual value and the extra iface ... line at the bottom

I have manual in there as well (interestingly, for eth0 as well, as said, taken from the official raspbian)...

what is a default iface?

diederikdehaas · 2016-05-07T20:22:33Z

what is a default iface?

I actually don't know, I just know that I see that all the time and it also always works here.

Mausy5043 · 2016-05-07T20:34:07Z

what is a default iface?

I actually don't know, I just know that I see that all the time and it also always works here.

I've never used it. So, I hope you don't mind me not adding it. It works fine without.
Agree with the auto and hotplug entries. Will add those.

Mausy5043 · 2016-05-07T20:35:45Z

Mind you that not adding the eth0 interface here, doesn't mean it won't work.
It actually still will.
So, I'm adding entries for eth0 per your (2) request. But, it is not needed.

both `wlan` and `eth0` with `auto` and `hotplug`

Mausy5043 · 2016-05-07T20:43:40Z

Done.

goranche · 2016-05-07T20:59:52Z

not adding the eth0 interface here, doesn't mean it won't work

huh? really? why? how? I NEED ANSWERS!!! 😁

no, but really... how?

Mausy5043 · 2016-05-08T10:16:16Z

I have no idea. It just does.
Just guessing, but could it be dhclient?

goranche · 2016-05-08T10:45:47Z

could it be dhclient

it shouldn't be, AFAIK, if the interface isn't listed (to be brought up) in the interfaces file... 💭

diederikdehaas · 2016-05-08T15:43:27Z

FWIW I share goranche's skepticism.

Mausy5043 · 2016-05-08T20:14:18Z

OK. No problem. The eth0 definition has already been added as you requested so ... the discussion is moot anyway,

diederikdehaas · 2016-06-16T16:59:20Z

Next time I will require that you'll squash commits together 😉

I noticed that when you only have a wireless device plugged in, the boot process takes quite a long time because it's waiting for eth0, so you (@Mausy5043) may have had more of a point then I anticipated.

Mausy5043 added 3 commits March 27, 2016 19:19

Merge pull request #3 from debian-pi/v1.1.x

c1f26bc

sync with V1.1.x

Concentrate networking and relocate wpa_supplicant

ed10721

use the wpa_supplicant.conf in /etc/...

78d966d

goranche reviewed Mar 28, 2016
View reviewed changes

Mausy5043 added 6 commits March 28, 2016 16:28

Removed "weird alignment"

6f0aa60

no quotes needed on empty line

ef951a6

move empty line to before additional entries

a743a8b

removed empty comment line

0eebc42

moved the echo inside the if..fi block

d448b18

Add "wpa-conf" entry if not already present

83ddb88

Mausy5043 added 5 commits April 23, 2016 12:24

use required driver

6a780ff

select linux default wireless driver if not configured by user

2921902

create dir because wpasupplicant package doesn't

4214e66

proper way of adding wpasupplicant

bc212f0

L870 won’t work because the installed system hasen’t been `apt-get update`d.

properly starting wpa_supplicant

bdba1b3

echo with newline

9c452a9

goranche reviewed May 7, 2016
View reviewed changes

textual change

b0cb164

goranche reviewed May 7, 2016
View reviewed changes

moved empty line to visually separate interfaces

50f689e

spaces around pipes

e436443

diederikdehaas reviewed May 7, 2016
View reviewed changes

add indentation

75a9fc4

Mausy5043 added 2 commits May 7, 2016 22:37

Add eth0 entry

a1fb5c5

both `wlan` and `eth0` with `auto` and `hotplug`

textual change of comment

3131bab

small bug fix

5668fc6

diederikdehaas merged commit 7c1ab28 into debian-pi:v1.1.x Jun 16, 2016

This was referenced Jun 20, 2016

Installing over wireless? #44

Closed

Additional drivers support (was: USB ethernet dongle support) #52

Closed

wpa_supplicant.conf is stored at an odd location #349

Closed

This was referenced Sep 14, 2016

Add wifi configuration openhab/openhabian#14

Closed

Installation through wifi (RPi 3) #427

Closed

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wpa_supplicant usage #397

wpa_supplicant usage #397

Mausy5043 commented Mar 28, 2016 •

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wpa_supplicant usage #397

wpa_supplicant usage #397

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