Created a lightweight abstraction layer so that another i/o
reactor can be dropped in place of asio.
The basic approach is to rename all references to asio::xxx
types to openvpn_io::xxx and then make openvpn_io a
preprocessor variable that points to the top-level namespace
of the i/o reactor implementation.
All of the source files that currently include <asio.hpp> now
include <openvpn/io/io.hpp> instead:
This gives us a lightweight abstraction layer that allows us
to define openvpn_io to be something other than asio.
Other changes:
* Inclusion of asio by scripts/build is now optional, and is
enabled by passing ASIO=1 or ASIO_DIR=<dir>.
* Refactored openvpn/common/socktypes.hpp to no longer
require asio.
* Refactored openvpn/log/logthread.hpp to no longer require
asio.
* Added openvpn::get_hostname() method as alternative to
calling asio directly.
* openvpn/openssl/util/init.hpp will now #error
if USE_ASIO is undefined.
Signed-off-by: James Yonan <james@openvpn.net>
mutable_buffers_1 -> mutable_buffer
const_buffers_1 -> const_buffer
This patch is a granularization of a patch by David Sommerseth
<davids@openvpn.net> where only the above renames are included.
receive path to reassemble messages fragmented by the
SSL layer up to a max message size of 64 KB.
Ramifications:
* Peer info data and pushed options can be significantly
larger (i.e. approaching 64 KB).
* Less need for the options continuation feature.
Limitations:
* While this patch doesn't change the underlying OpenVPN
protocol, it can result in messages being sent that are
fragmented by the receiving SSL implementation into
multiple buffers. Implementations that lack reassembly
capabilities (such as OpenVPN 2.x at this point in time)
would see each buffer fragment as a separate message.
* This patch running on the server will break negotiation
with pre-peer-info clients. Basically this means it will
interoperate with any OpenVPN 3 version or OpenVPN 2.x
version that includes the June 2010 commit "Implemented a
key/value auth channel from client to server.
Version 2.1.1i".
* added const_buffers_1_limit() method that is like
const_buffers_1_clamp() but includes an upper-bound size
constraint.
* realign() should be a no-op if headroom == offset_
* added additional reset() convenience method that also calls
init_headroom()
* rename BOOST_NOEXCEPT to noexcept
* verify that certain classes are noexcept move constructable
including Option, Buffer, BufferAllocated, RunContext::Thread
max_size_tailroom() instead of remaining(tailroom) to compute
remaining space. This makes sense because max_size_tailroom()
doesn't consider the existing buffer length, just as data()
doesn't.
* Added reserve().
* Added set_trailer() which is useful for maintaining
null-terminated strings.
* Added indexing methods (index and c_index) that return
pointers rather than references.
* Added range() method for returning a subrange of a
buffer as another buffer.
