Also includes some bug fixes.
1. Add a function that returns a pointer to a session's username string.
2. Add a function to set a "raw" username copied from an incoming packet.
3. Add tests for 1 and 2.
4. Server saves a copy of the username on successful authentication.
5. Fix bug with GetString() where it would choke on a 0 length string.
6. Clean up the termios macros and mode creation.
7. Add some options for when WOLFSSL_VXWORKS is set.
1. Added some command line options to the wolfSFTP client to show how to
use a hardcoded automatic file transfer rather than using the command
shell. On top of that, added a script to get and put some sample files.
It was built into the wolfSFTP client to allow for using all forms of
authentication as well as using the command line password.
2. Update wolfSSH_SFTP_STAT() with clearing the error register if it is WANT_READ.
1. When printing server worker errors, print out the error string on the
stored error code, not the return value.
2. If the error is a socket error, don't try to send a shutdown message
to the peer.
3. Update the echoserver to close the connection cleanly when the SFTP
peer exits.
4. Added a function to check a WOLFSSL_CHANNEL if it is in eof.
1. Clean up a few compiler warnings.
2. Between Windows, MacOS, and Linux, the %llu printf tag varies
slightly, add a typecast of the word64 to unsigned long long to hush the
compiler warning.
1. Cleanup some debug printouts.
2. Add option to the echoserver and wolfSFTP client to use ECC keys or RSA
keys for user authentication.
3. Add option to the echoserver to use ECC keys for peer authentication.
Note, the user authentication type is still hardcoded in the library as
password. To use public key, need to update the authId in
SendUserAuthFailure().
1. Refactor of the RSA public key and password user auth code.
2. In the userauth code remove some usused variable names or use some orphaned variables.
3. Fix the sizes used for calculating the buffer size for ECC public keys.
4. Add in the length of the ECDSA signature wrapping the set r,s.
5. Return the public key rejected error code from DoUserAuthRequestPublicKey when the callback returns invalid public key.