Support remote connection to the WinDbg user mode

[XVilka]

Currently Rizin supports remote connection to the KD interface through winkd://. There is also a support for DbgEng but only for Windows and locally.

The missing piece is the ability to connect to the remote WinDbg instance for the user mode, e.g. from Linux or MacOS machine into the Windows VM.

See https://book.rizin.re/debugger/windbg.html

[s0i37]

I have tested with last commit:

rizin 0.4.0-git @ linux-x86-64
commit: 52825a7a027c47e4da5335330c9755d77ab64ca8, build: 2022-02-11__12:37:08

On remote machine:

cdp -p 1234
.server tcp:port=5005

It is doesn't work:

/rizin -a x86 -b 32 -d winkd://10.0.0.64:5005:1.2.3.4
...
Opened kdnet 10.0.0.64:5005:1.2.3.4 with fd 0x5596607bd6b0

./rizin -D winkd winkd://10.0.0.64:5005:1.2.3.4 ... Opened kdnet 10.0.0.64:5005:1.2.3.4 with fd 0x56459548f080

Each time rizin hangs. After pressing "ctrl-c" it send to remote side:

U 10.0.0.1:5005 -> 10.0.0.64:5005 #13 MDBG...x..2.h....Hp.X'i.E.......f..x..

Why rizin use UDP instead of TCP?

[s0i37]

Also I've checked winkd with pipe:

qemu ... -chardev socket,id=serial0,path=/tmp/serial0,nowait,server -serial chardev:serial0

cdb.exe -p PID
.server com:port=com1

chmod 777 /tmp/serial0
rizin -a x86 -b 32 -D winkd winkd:///tmp/serial0
r2 -a x86 -b 32 -D winkd winkd:///tmp/serial0

In each case rizin/r2 hangs

[XVilka]

@GustavoLCR could you please take a look when you have time?