The shell does exactly the same as the previous, just made the code read much
better so as to not severely anger the gray beards and other lesser
mainframe deities. The only architectural change is the payload uses the
spawn system call vs exec - this provides for a cleaner exit in some cases.
PR7007 centralized JCL job card for any JCL cmd payload. This PR simply
uses that new format for existing JCL cmd payloads. No functionality
for these payloads was changed, added or deleted.
Added a JCL-based reverse shell. Uses the same source code as the
shellcode version does. Source code is in
external/source/shellcode/mainframe/shell_reverse_tcp.s
adfoster-r7