Adds sets of process (Linux only), user, and group IDs for filtering
connections from peer processes over IPC transport. If all of the
filter sets are empty, every connection is accepted. Otherwise,
credentials for a connecting process are checked against the filter sets
and the connection is only accepted if a match is found.
This commit is part of LIBZMQ-568 and only adds the filter sets and
implements the filter in the IPC accept method. The interface for
adding IDs to filter sets are included in a separate commit.
IPC accept filtering is supported only on Linux and OS X.
As TIPC transport for 0MQ will only work on post 3.8
Linux kernels where nonblocking connect was added,
we add AC_RUN test to check for this functionality.
Should the test fail, tipc is excluded from build/test.
Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>
The use of binary for CURVE keys is painful; you cannot easily copy
these in e.g. email, or use them directly in source code. There are
various encoding possibilities. Base16 and Base64 are not optimal.
Ascii85 is not safe for source (it generates quotes and escapes).
So, I've designed a new Base85 encoding, Z85, which is safe to use
in code and elsewhere, and I've modified libzmq to use this where
it also uses binary keys (in get/setsockopt).
Very simply, if you use a 32-byte value, it's Base256 (binary),
and if you use a 40-byte value, it's Base85 (Z85).
I've put the Z85 codec into z85_codec.hpp, it's not elegant C++
but it is minimal and it works. Feel free to rewrap as a real class
if this annoys you.
./configure --with-system-pgm
detect the OpenPGM 5.2 system library.
Note that OpenPGM installs a versioned pkgconfig file
(openpgm-5.2.pc, openpgm-5.1.pc).
