dns-proxy: Don't use proxy socket if we fail to bypass it

This will result in an infinite loop as packets sent over that socket
will again pass through the TUN device and the DNS proxy.

Apparently, bypassing fails when airplane mode is enabled.

Fixes #662.
imv-swid: Use pkg-config to check for libjson-c

The package/library is called libjson-c on recent distributions.
Some like Ubuntu 14.04 provide symlinks with the old name but these
will eventually disappear.  Using pkg-config allows us to easily check
for it (with a fallback) and configure the proper compiler flags.

Fixes #663.
Updated build-database.sh to 3.13.0-32-generic Ubuntu kernel
unused os_info_t object removed
Added Debian 7.6 to IMV database
starter: Don't monitor child if debugger is attached

Signed-off-by: Thomas Egerer <thomas.egerer@secunet.com>
starter: Wait indefinitely for charon when using --attach-gdb

This makes sure the user has time to set break points etc. before it runs
charon under gdb.
configure: Add additional includes when checking for linux/fib_rules.h

This seems to be required on Cent OS 6.5.
kernel-pfroute: Fix kernel response handling

The condvar is signaled for every handled message received from the
kernel not only for replies (this changed with 2a2d7a4dc8).  This may
cause segfaults because this->reply is not set when the waiting thread is
woken due to an IP address change.

Since this->reply is only set when it is actually the expected reply (and
only one request is sent at a time, thanks to c9a323c1d9) we only have
to make sure the reply is there (and clear it once we handled it).

Using separate condvars could also be an option in the future.
diffie-hellman: Explicitly initialize DH exponent sizes during initialization

To avoid any race conditions when multiple threads call and initialize
diffie_hellman_get_params(), explicitly examine the optimum DH exponent size
during library initialization.

Fixes #655.
ike-sa-manager: Use transient hasher for IKE_SA_INIT hash calculation

To check if a received IKE_SA_INIT request is a new request or a
retransmit, charon maintains hashes of the pending IKE_SA_INIT
exchanges.

However, the hash calculation is not reentrant because a single hasher
is used for the whole IKE SA manager. It leads to bogus calculations
under high load and hence dropped messages on responder
(IkeInInvalidSpi incremented).

Don't share a single hasher in the IKE SA manager, create a transient
one whenever a message must be hashed.

Signed-off-by: Christophe Gouault <christophe.gouault@6wind.com>
starter: Do not close all file descriptors after fork()

As we use libstrongswan and expect that it still works after the fork, we
can't just closefrom() all file descriptors. Watcher, for example, uses
a pipe to notify FDSET changes, which must be kept open.

Reverts 652ddf5ce2fad08f6569096dd56a821500cc5ba4.
utils: Add some initial build time assertion macros

These are useful to assert constants during build time. We evaluate the
expression to 0 when valid, so we can safely use the evaluated value.
utils: Check if the parameter passed to countof() is actually an array type

This should avoid errors such as the one fixed with 118b2879.
ikev1: Accept Quick Mode DELETES while Quick Mode rekeying is active

If a peer immediately sends DELETE messages when completing Quick Mode rekeying,
the third Quick Mode message and the DELETE are sent simultaneously. This
implies that DELETE messages may arrive before the completing third Quick Mode
message.

Handle this case by ignoring the DELETE INFORMATIONAL in Quick Mode and let
the delete task handle it.
ikev1: Extend adopt_children_job by task queuing, executed after adoption
ikev1: Defer Mode Config push after CHILD adoption and reauth detection

When an initiator starts reauthentication on a connection that uses push
mode to assign a virtual IP, we can't execute the Mode Config before releasing
the virtual IP. Otherwise we would request a new and different lease, which
the client probably can't handle. Defer Mode Config execution, so the same IP
gets first released then reassigned during reauthentication.
ikev1: Defer Mode Config push after CHILD adoption when using XAuth
Merge branch 'push-mode-reauth'

Fixes IKEv1 re-authentication when using push mode by reassigning the same
IP lease to the client.
unity: Handle narrowing according to roles in the IKE_SA

Since the narrow hook types reflect the roles in the Quick Mode exchange
the plugin behaved incorrectly if the server initiated the CHILD_SA
rekeying.