hostapd_cli problem with ctrl_iface for WPS

["Jan Tröster"]

Hello together,

I’m working on a project with a RPI 3 (as AP) for I/O-Devices which should connect via WPS (wps_pbc).

But in the moment I stuck with the ctrl_iface on hostapd.

When I run hostapd with the following hostapd.conf the service won’t start up and aborts (shown in debug).

 

########################## START QUOTE $ sudo nano hostapd.conf
interface=wlan0
#driver=n180211

#WLAN
ssid=SomeSSID
channel=10
hw_mode=g
ieee80211n=1
#ieee80211d=1
country_code=DE
wmm_enabled=1
ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP
rsn_pairwise=CCMP
wpa_passphrase=SomePASSPHRASE

#WPS configuration
wpa_psk_file=/etc/hostapd/hostapd.psk

#Enable control interface for PBC/PIN entry
ctrl_interface=/var/run/hostapd/
ctrl_interface_group=0

#Enable internal EAP server for EAP-WSC
eap_server=1
wps_state=2
ap_setup_locked=1
uuid=SomeUUID
wps_pin_requests=/var/run/hostapd.pin-req
device_name=Wireless AP
manufacturer=Company
model_name=WAP
model_number=123
serial_number=12345
device_type=6-0050F204-1
os_version=01020300
config_methods=label display push_button keypad
pbc_in_m1=1
########################## END QUOTE

 
########################## START QUOTE $ sudo hostapd -dd /etc/hostapd/hostapd.conf
...
Using existing control interface directory.
ctrl_iface bind(PF_UNIX) failed: Address already in use
ctrl_iface exists and seems to be in use - cannot override it
Delete '/var/run/hostapd//wlan0' manually if it is not used anymore
Failed to setup control interface for wlan0
wlan0: Unable to setup interface.
...
########################## END QUOTE


When I follow the information and delete the file, the interface will lose his socket.

 
########################## START QUOTE $ sudo hostapd_cli wps_pbc
Failed to connect to hostapd - wpa_ctrl_open: No such file or directory
########################## END QUOTE


With commenting out the ctrl_interface in the hostapd.conf the AP is working (but then I cannot use the hostapd_cli function).

I was also looking for some process which is using this address but didn’t succeed.

Has somebody an idea how to get out of this circle?

 
Additional Information’s:
########################## START QUOTE $ hostapd -v
hostapd v2.3
########################## END QUOTE
########################## START QUOTE $ cat /proc/version
Linux version 4.9.35-v7+ (dc4 at dc4-XPS13-9333) (gcc version 4.9.3 (crosstool-NG
crosstool-ng-1.22.0-88-g8460611) ) #1014 SMP Fri Jun 30 14:47:43 BST 2017
########################## END QUOTE
########################## START QUOTE $ sudo nano /etc/network/interfaces
#Loaclhost
auto lo
iface lo inet loopback
 

#Ethernet
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

#WLAN
auto wlan0
allow-hotplug wlan0
iface wlan0 inet static
address 172.24.1.1
netmask 255.255.255.0
network 172.24.1.0
broadcast 172.24.1.255
#wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

up /sbin/iptables -F
up /sbin/iptables -X
up /sbin/iptables -t nat -F
 
up /sbin/iptables -A INPUT -i lo -j ACCEPT
up /sbin/iptables -A OUTPUT -o lo -j ACCEPT

up /sbin/iptables -A FORWARD -o eth0 -i wlan0 -m conntrack --ctstate NEW -j ACCEPT
up /sbin/iptables -A FORWARD -m conntrack --cstate ESTABLISHED,RELATED -j ACCEPT
up /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

up sysctl -w net.ipv4.ip_forward=1
up sysctl -w net.ipv6.conf.all.forwarding=1

up service hostapd restart
up service dnsmasq restart
########################## END QUOTE

 

Any kind of help is welcome.

Thanks in advance for your answer.

BR,

JT