Handle a few common error codes from send():
* EAGAIN: reschedule without increasing retry count.
This prevent nodes from failing on slow/very slow connections.
* ENETUNREACH, EHOSTUNREACH: expire the node immediately instead
of waiting for an answer, to expire IPv6 nodes quickly if no
IPv6 network is available.
Add support to log using standard syslog,
add related option in dhtnode.
dhtnode will use syslog by default
when starting in daemon mode and
no logfile is defined.
Throw an exception if GnuTLS is too old
instead of not providing the API.
Also consistently throw in case of hash error,
and return 0 for an empty hash, for both
PublicKey and Certificate.
Prefer a const reference instead of shared_ptr if the shared_ptr
is not used and argument type is not changed in the method.
This allows to prevent useless shared_ptr allocations.
In getRealPrefix, use OpState to track state instead of using many
different shared_ptr.
Fixes a bug where some callbacks wouldn't be called when a dummy request was
inserted to cancel some operation while not using the
net::Request::State::COMPLETED flag as per 19c47ec.
When learning about nodes in an answer,
we used to drop nodes with loopback address.
Address is now replaced by the packet sender
address and the port is preserved.
The op token is renewed regularly (around every 30 minutes),
so SHA256 provides enough security for this non-sensitive token.
SHA256 takes 32 bytes instead of 64 bytes for SHA512,
and the token is included in every listen requests,
renewed every 30 seconds, and every answer to get.
In the context of limited bandwith usage, using SHA256 seems more appropriate.
This change is backward and forward compatible.
Adrien Beraud
Simon Désaulniers
Simon Désaulniers