dhclient conflict between /sbin/devd and /etc/rc.d/netif ?

[Brooks Davis]

On Mon, Feb 11, 2008 at 01:23:57PM +1100, Robert Jenssen wrote:
> Hi,
> 
> Thanks for the prompt reply. By "owned", I meant that "ps -ajx" 
> shows /sbin/devd as the process group leader. For example, at the moment on 
> my system:
> 
> [root etc]ps -axj | grep devd
> root        5727     1  5727  5727    0 Is    ??    0:00.00 /sbin/devd
> [root etc]ps -axj | grep dhclient
> root        6373     1  5727  5727    0 I     ??    0:00.00 dhclient: ral0
> _dhcp       6395     1  6395  6395    0 Ss    ??    0:00.09 dhclient: ral0
> [root etc]             
> 
> I agree, /sbin/devd calls /etc/rc.d/dhclient which checks for the existence of 
> a running dhclient. I find the rc scripts hard to follow but so far as I can 
> see /etc/rc.d/netif simply calls "ifconfig dhcp" and doesn't check for a 
> running dhclient.

The head of the process group is completely irrelevent and has no effect.
/etc/rc.d/netif litereally calls /etc/rc.d/dhclient is most definitly does not
call "ifconfig dhcp" since no varient of that has ever worked.

        if dhcpif $1; then
                if [ $_cfg -ne 0 ] ; then
                        ifconfig $1 up
                fi
                if syncdhcpif $1; then
                        /etc/rc.d/dhclient start $1
                fi
                _cfg=0
        fi


> Here are the relevant lines in my rc.conf:
> 
> rc_debug="YES"
> ifconfig_ral0="inet dhcp channel 10 wpa up"

"inet" is wrong here and "channel 10" is pointless unless you're running
an AP or in ad-hoc mode. You're basically luck that anything works for
you since this generates a completely bogus ifconfig command.

> devd_enable="YES"
> 
> Here is the output of "/etc/rc.d/netif restart":
> 
> [root etc]rc.d/netif restart
> rc.d/netif: DEBUG: run_rc_command: doit: network_stop
> Stopping network:Stopping wpa_supplicant.
> /etc/rc.d/wpa_supplicant: DEBUG: run_rc_command: doit: kill -TERM 6229
> /etc/rc.d/dhclient: DEBUG: run_rc_command: doit: dhclient_stop
>  lo0 fwip0 fwe0 rl0 ral0 plip0rc.d/netif: DEBUG: The following interfaces were 
> not configured:
> .
> rc.d/netif: DEBUG: run_rc_command: doit: network_start
> rc.d/netif: DEBUG: Cloned:
> Starting wpa_supplicant.
> /etc/rc.d/wpa_supplicant: DEBUG: run_rc_command: 
> doit: /usr/sbin/wpa_supplicant  -q -B -i ral0 -c /etc/wpa_supplicant.conf -D 
> bsd -P /var/run/wpa_supplicant/ral0.pid
> rc.d/netif: DEBUG: checkyesno: synchronous_dhclient is set to YES.
> /etc/rc.d/dhclient: DEBUG: run_rc_command: doit: dhclient_start
> /etc/rc.d/dhclient: DEBUG: checkyesno: background_dhclient is set to NO.
> ral0: no link ............ got link
> DHCPREQUEST on ral0 to 255.255.255.255 port 67
> DHCPDISCOVER on ral0 to 255.255.255.255 port 67 interval 8
> DHCPOFFER from 192.168.0.1
> DHCPREQUEST on ral0 to 255.255.255.255 port 67
> DHCPACK from 192.168.0.1
> bound to 192.168.0.4 -- renewal in 43200 seconds.
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
>         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x6
>         inet6 ::1 prefixlen 128
>         inet 127.0.0.1 netmask 0xff000000
> ral0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         ether 00:xx:....
>         inet 192.168.0.4 netmask 0xffffff00 broadcast 192.168.0.255
>         media: IEEE 802.11 Wireless Ethernet autoselect (OFDM/54Mbps)
>         status: associated
>         ssid xxxxxxxxxxxx channel 10 (2457 Mhz 11g) bssid 00:xx:.....
>         authmode WPA privacy ON deftxkey UNDEF TKIP 3:128-bit txpower 50
>         bmiss 7 scanvalid 60 bgscan bgscanintvl 300 bgscanidle 250
>         roam:rssi11g 7 roam:rate11g 5 protmode CTS roaming MANUAL
> rc.d/netif: DEBUG: The following interfaces were not configured:  fwip0 fwe0 
> rl0 plip0
> /etc/rc.d/ipfilter: DEBUG: checkyesno: ipfilter_enable is set to NO.
> 
> Now I have four dhclient processes:
> 
> [root etc]ps -axj | grep dhclient
> root        9824     1  5727  5727    0 S     ??    0:00.00 dhclient: ral0 
> [pri
> _dhcp       9853     1  9853  9853    0 Ss    ??    0:00.00 dhclient: ral0 
> (dhc
> _dhcp       9880     1  9880  9880    0 Ss    ??    0:00.00 dhclient: ral0 
> (dhc
> root        9826     1  9283  1916    0 S     p0    0:00.00 dhclient: ral0 
> [pri
> 
> It seems that devd has started two new dhclients and netif has started its own 
> pair as well. 1916 is the process id of the bash shell I su'ed from to 
> start /etc/rc.d/netif.

Does you still set four processes in the steady state?  That shouldn't happen
since starting a second dhclient is supposed to kill the existing one.
There should be two processes per interface due to the privege seperation
model used by dhclient.

-- Brooks
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