[PATCH v2 0/2] Implement connmand state monitoring to vpnd

[Jussi Laakkonen <jussi.laakkonen@jolla.com>]

Implement connmand state monitoring into vpnd to keep track of the state
changes in regards to connectivity and D-Bus registration. vpnd retrieves the
state from connmand using Manager interface when started and otherwise it
monitors PropertyChanged signals as well as utilizes D-Bus service monitoring
to get the changes.

This change prevents connecting VPNs when connmand is not yet online or has
gone away from D-Bus (e.g., restart). In case VPN is connected before the state
has been queried a delayed connection function is utilized to connect that VPN
when online/ready state is reached.

In case connmand is offline or gone from D-Bus ENOLINK is returned as an error.
This is handled in plugins/vpn.c and returned back to the caller as NoCarrier
D-Bus error message.

Changes since V2:
 - Updated vpn-provider patch to v3: cleanups, reformat, remove agent checks.
 - Updated vpn patch to v2: do handle ENOLINK properly and reformat.

Jussi Laakkonen (2):
  vpn-provider: Implement connmand online state checking
  vpn: Refactor connect_reply() and handle NoCarrier ->  ENOLINK error

 plugins/vpn.c      |  14 +-
 vpn/vpn-provider.c | 357 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 368 insertions(+), 3 deletions(-)

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2.20.1