We use libssh2 to implement sftp feature. SSHSession is closely
designed to TLSSession, but it differs in several aspects. In this
code, we only implements read part of sftp, since aria2 won't offer
uploading feature. Adding SSH/sftp to SocketCore is a bit bloat. But
by doing this we can reuse DownloadCommand, without mostly no
modification. We can just create SSHDownloadCommand by inheriting it,
just like existing ftp.
Use one of the following to provide random bytes:
- Windows CryptGenRandom
- Linux getrandom (syscall interface to urandom, without nasty corner
cases such as file descriptor exhaustion or re-linked /dev/urandom)
- std::device_random (C++ random device, which usually will be urandom)
This also equalizes util::getRandom and SimpleRandomizer (the former
will now use the latter) instead of having essentially two different
PRNG interfaces with potentially different quality.
Closes GH-320
The algorithms the `CryptProv` on Windows supports does not currently
include SHA-224, so there is a "dark spot" in this implementation. Also
on Win XP < SP3, most of the SHA-2 family is not actually supported.
All other implementation provide support for MD5, SHA-1 and all of the
SHA-2 family, hence drop the incomplete WinMessageDigest implementation
in favor of any other supported implementation (at least the internal
implementation is always available at compile-time).
Add and use usedCompilerAndPlatform(). This adds compiler information to
INFO logs and the --version output, and may be helpful when trying to
diagnose/reproduce user-reported problems.
Also make INFO logs include usedLibs() output.
Closes#235
Now mingw-w64 C++ compiler defines __USE_MINGW_ANSI_STDIO to 1, we
have to follow it as well. We hope that mingw version of stdio
function behaves like Linux ones. We have not tested them thoroughly
yet. pthread for windows defines its own HAVE_STRUCT_TIMESPEC macro.
To avoid warning, we rename our version of it as
HAVE_A2_STRUCT_TIMESPEC.
