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Old 4 Days Ago
brudan brudan is offline
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Posts: 29
Default how to prioritize "join" entries in /etc/hostname.if

I'm rocking OpenBSD 6.4-stable on my Thinkpad T400 laptop. I use the internet exclusively over wifi. I'd like to somehow configure things so that if my phone's hotspot is on, laptop always connects to it instead of home, work, or other hotspot.

My /etc/hostname.athn0 looks like this:

Code:
join home_sweet_home wpakey PassWorD
join AndroidAP wpakey paSSwOrd
join work_bitter_work wpakey pasSwORd 
dhcp
The hostname.if(5) man page has no mention of join. ifconfig(8) man page mentions join but not how to prioritize multiple appearances of it in hostname.if.

Does anyone know how to prioritize the join entries, so that one SSID (AndroidAP in my case) is always given priority over the others?

P.S. In his second post here, developer phessler mentions an Apple-like algorithm for choosing the network, but no mention of how to manually specify priority.

Last edited by brudan; 4 Days Ago at 07:54 PM. Reason: P.S. with link to undeadly.org
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Old 4 Days Ago
brudan brudan is offline
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Default

Never mind. I just rolled my own. I deleted /etc/hostname.athn0 and now I just run the script below as root at boot. No fancy algorithm here: The SSIDs are searched in order, first one found connects.

Code:
#!/bin/sh

main()
{
	get_available_networks

	# these will be tried in order, so put favored networks on top:
	ssid="AndroidAP"; key="paSSworD"; search && connect && exit 0
	ssid="Work-Visitor"; key=""; search && connect && exit 0
	ssid="home_sweet_home"; key="PassWoRd"; search && connect && exit 0

	exit 1
}

get_available_networks()
{
	available_networks=/tmp/available_networks
	ifconfig athn0 down && ifconfig athn0 up && sleep 5
	ifconfig athn0 scan | grep -v ieee80211 > $available_networks # the line with ieee80211 lists prior connection, which may not be currently available
}

search()
{
	grep -q "$ssid" "$available_networks"
}

connect()
{
	if [ -n "$key" ]; then
		ifconfig athn0 nwid "$ssid" wpakey "$key" && dhclient athn0 
	else
		ifconfig athn0 nwid "$ssid" -wpakey && dhclient athn0
	fi
}

main
P.S. The weak part of the script is the get_available_networks function: Sometimes a hotspot is not detected by the scan, even though there is good signal. Anything I can do to make the scan more reliable?

Last edited by brudan; 3 Days Ago at 06:03 PM.
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