Re: API for dispatcher scripts

[Dan Williams <dcbw redhat com>]

On Wed, 2015-08-19 at 21:24 +0200, Olaf Hering wrote:
> After upgrading from openSUSE 11.4 with NM 0.9.something to openSUSE
> Tumbleweed with NM 1.0.2 I was under the impression that the
> interface/API for the scripts in /etc/NetworkManager/dispatcher.d is
> much more reliable, and much more informative.
>
> But just now I got a different interface for the up and the down event
> of a gsm connection. Thankfully the DEVICE_IFACE is the same for the up
> and down event, so I will adjust my scripts to use that.
>
> On another host I get different environment for initial vpn-up and a vpn
> restart. The latter lacks the route info because that is not provided
> during restart after the vpn gateway timed out. Right now I dont have
> the exact env data at hand, but I have added logging now to compare both
> variants. Perhaps there are already ways to catch both.
>
>
> I wonder if there is any promise for the called scripts, or if its just
> more or less random data that is provided as cmdline arguments and
> environment.

The dispatcher scripts get called (since at least May 2011) with the 'IP
interface' of the device, because that's what is almost always useful
for IP and routing operations:

        /* Backwards compat: 'iface' is set in this order:
         * 1) VPN interface name
         * 2) Device IP interface name
         * 3) Device interface anme
         */
        if (vpn_ip_iface)
                *out_iface = g_strdup (vpn_ip_iface);
        else if (ip_iface)
                *out_iface = g_strdup (ip_iface);
        else
                *out_iface = g_strdup (iface);

in your case, the modem's control interface (and thus the NM Device
name) is cdc-wdm0 but the actual interface that IP will run on is
wwp0s29f7u2i4.  Does that make sense?

If you're able to get logs from NM 0.9.x showing this isn't the case
there, I'd love to see them to figure out why they're doing that.

Dan

> Olaf
>
>
> Wed Aug 19 19:01:07 UTC 2015
> 124.10 115.21
> /etc/NetworkManager/dispatcher.d/01-dnsmasq-conf.sh wwp0s29f7u2i4 up
> CONNECTION_FILENAME=/etc/NetworkManager/system-connections/Vodafone WebSessions
> CONNECTION_ID=Vodafone WebSessions
> CONNECTION_UUID=9d9f7b94-b534-4a68-b78c-ba4e1899d4b3
> DEVICE_IFACE=cdc-wdm0
> DEVICE_IP_IFACE=wwp0s29f7u2i4
> DHCP4_BROADCAST_ADDRESS=10.230.151.223
> DHCP4_DHCP_LEASE_TIME=7200
> DHCP4_DHCP_MESSAGE_TYPE=5
> DHCP4_DHCP_SERVER_IDENTIFIER=10.230.151.221
> DHCP4_DOMAIN_NAME_SERVERS=139.7.30.125 139.7.30.126
> DHCP4_EXPIRY=1440018067
> DHCP4_HOST_NAME=esprimo
> DHCP4_IP_ADDRESS=10.230.151.220
> DHCP4_NETWORK_NUMBER=10.230.151.220
> DHCP4_REQUESTED_BROADCAST_ADDRESS=1
> DHCP4_REQUESTED_DOMAIN_NAME=1
> DHCP4_REQUESTED_DOMAIN_NAME_SERVERS=1
> DHCP4_REQUESTED_DOMAIN_SEARCH=1
> DHCP4_REQUESTED_HOST_NAME=1
> DHCP4_REQUESTED_INTERFACE_MTU=1
> DHCP4_REQUESTED_MS_CLASSLESS_STATIC_ROUTES=1
> DHCP4_REQUESTED_NDS_CONTEXT=1
> DHCP4_REQUESTED_NDS_SERVERS=1
> DHCP4_REQUESTED_NDS_TREE_NAME=1
> DHCP4_REQUESTED_NETBIOS_DD_SERVER=1
> DHCP4_REQUESTED_NETBIOS_NAME_SERVERS=1
> DHCP4_REQUESTED_NETBIOS_NODE_TYPE=1
> DHCP4_REQUESTED_NETBIOS_SCOPE=1
> DHCP4_REQUESTED_NIS_DOMAIN=1
> DHCP4_REQUESTED_NIS_SERVERS=1
> DHCP4_REQUESTED_NTP_SERVERS=1
> DHCP4_REQUESTED_RFC3442_CLASSLESS_STATIC_ROUTES=1
> DHCP4_REQUESTED_ROUTERS=1
> DHCP4_REQUESTED_STATIC_ROUTES=1
> DHCP4_REQUESTED_SUBNET_MASK=1
> DHCP4_REQUESTED_WPAD=1
> DHCP4_ROUTERS=10.230.151.221
> DHCP4_SUBNET_MASK=255.255.255.252
> IP4_ADDRESS_0=10.230.151.220/30 10.230.151.221
> IP4_GATEWAY=10.230.151.221
> IP4_NAMESERVERS=139.7.30.125 139.7.30.126
> IP4_NUM_ADDRESSES=1
> IP4_NUM_ROUTES=0
> IP6_GATEWAY=::
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
> PWD=/
> SHLVL=1
> _=/usr/bin/env
>
> Wed Aug 19 19:11:52 UTC 2015
> 768.50 1344.47
> /etc/NetworkManager/dispatcher.d/01-dnsmasq-conf.sh cdc-wdm0 down
> CONNECTION_FILENAME=/etc/NetworkManager/system-connections/Vodafone WebSessions
> CONNECTION_ID=Vodafone WebSessions
> CONNECTION_UUID=9d9f7b94-b534-4a68-b78c-ba4e1899d4b3
> DEVICE_IFACE=cdc-wdm0
> DEVICE_IP_IFACE=cdc-wdm0
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
> PWD=/
> SHLVL=1
> _=/usr/bin/env
>
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