Automatically run "dhclient ue0" when I turn on USB tethering on Android phone.

colemakker

colemakker

Hi,

USB Tethering enables internet access over USB. I need to use sudo to run dhclient ue0, but I would rather log in as a user without sudo privileges for day to day use, so I would like to make it automatic. I understand I could do this with devd.conf

When I log in in single user mode and plug my phone in or turn on USB Tethering a message comes up-
ugen5.2: <MediaTek> at usbus5

Code: 
$ sudo usbconfig list
...
ugen5.2: <VF-795 MediaTek> at usbus5, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (500mA)

I wasn't really sure what to do with the little information I have, here were my attempts in /etc/devd.conf

Code: 
#attach 0 {
#   device-name "ugen5.2";
#   action "/etc/rc.d/dhclient ue0";
#};

#notify 0 {
#   match "system"       "USB";
#   match "subsystem"   "INTERFACE";
#   match "type"       "ATTACH";
#   action "/etc/rc.d/dhclient ue0";
#};

#attach 0 {
#   device-name "VF-795 MediaTek";
#   action "/etc/rc.d/dhclient ue0";
#};

Actually I tried to check if anything I did in devd.conf worked with the line
Code: 
   action "mousepad /boot/loader.conf";
but it never opened.

I expect it's pretty easy.
Thanks
 
  • Thanks
Reactions: ASX
You can use an entry like this (Note that is /sbin/dhclient, not /etc/rc.d/dhclient):
Code: 
attach 100 {
        match "vendor"  "0x<vendor_id>";
        match "product" "0x<product_id>";

        action "/sbin/dhclient ue0";
};
Here devd(8) will check for a device that has the specific vendor AND product id defined by the user, and then act accordingly.
However you can even have an entry in /etc/rc.conf for ue0:
Code: 
ifconfig_ue0="SYNCDHCP"
So when your device will switch to USB tethering mode, the OS will bring up ue0 and run dhclient(8).

HTH
 
Thanks, the devd based activation looks quite appealing for use with a laptop wifi switch. ;)
 
Maxnix said:
You can use an entry like this (Note that is /sbin/dhclient, not /etc/rc.d/dhclient):
Code: 
attach 100 {
        match "vendor"  "0x<vendor_id>";
        match "product" "0x<product_id>";

        action "/sbin/dhclient ue0";
};
Click to expand...
Thanks, can you tell me how I would find the vendor/product ids?
Maxnix said:
However you can even have an entry in /etc/rc.conf for ue0:
Code: 
ifconfig_ue0="SYNCDHCP"
So when your device will switch to USB tethering mode, the OS will bring up ue0 and run dhclient(8).

HTH
Click to expand...
Thanks again, that worked immediately.
 
Thanks people, the devd.conf method is working now too (much time lost to not realising a restart is required after editing devd.conf).

Can you tell me what the number after attach signifies? attach 100, attach 0 and attach 10 seem to behave similarly.

Another small issue - when I turn the connection off then on on my phone within a certain period of time (~20 seconds) my bandwidth monitor net/bmon adds 4GB to my transmitted and received totals ... I wondered if adding a detach rule would clear it up, if a dhclient detach command exists - I found in the templates in devd.conf -
Code: 
# Try to start dhclient on Ethernet-like interfaces when the link comes
# up.  Only devices that are configured to support DHCP will actually
# run it.  [file]No link down rule exists because dhclient automatically exits
# when the link goes down.[/file]
#
notify 0 {
   match "system"       "IFNET";
   match "type"       "LINK_UP";
   media-type       "ethernet";
   action "/etc/rc.d/dhclient quietstart $subsystem";
};
Edit: same behaviour when using /etc/rc.conf ifconfig_ue0="SYNCDHCP" method.
 
colemakker said:
Can you tell me what the number after attach signifies? attach 100, attach 0 and attach 10 seem to behave similarly.
Click to expand...
The number sets the priority of the rule. The higher, the first. In this way you prevent that others rule that can match your device would be choosen instead of your defined one.
Phishfry said:
I could see devd use for cellular modems that need usbmodeswitch as well.
Click to expand...
That's what I personally use. :) devd(8) to switch, /etc/rc.conf to assign address with DHCP. :)
 
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