Add MCSSH draft

mcssh.lua

@@ -0,0 +1,60 @@
+local component=require("component")
+
+local function myPrint(...)
+    return io.write(...)
+end
+
+function doRunSSH(sock)
+    local cmdLength=0
+    local cmdLengthTmpStr=""
+    local cmdLengthLeftBit=4
+    while true do
+        local s=sock.read(cmdLengthLeftBit)
+        if(s==nil) then return
+        else
+            cmdLengthTmpStr=cmdLengthTmpStr .. s
+            cmdLengthLeftBit=cmdLengthLeftBit-string.length(s)
+            if(cmdLengthLeftBit==0) then -- Receive 4B length
+                cmdLength=tonumber(cmdLengthTmpStr)
+                cmdLengthTmpStr="" -- Reset TmpStr
+                -- Start Data Receive
+                local cmdText=""
+                local done=0
+                while (done<cmdLength) do
+                    s=sock.read(cmdLength-done)
+                    if(s==nil) then return end-- Connection Closed.
+                    done=done+string.length(s)
+                    cmdText=cmdText .. s
+                end
+                -- Command received. Write to a temp file
+                -- This is because OC-Lua does not implements loadstring(). So we use dofile() instead
+                local fd=io.open("/tmp/a.lua","w")
+                fd:write(cmdText)
+                fd:close()
+                -- Replace output
+                local oldprint=print
+                print=oldprint
+                io.open("/tmp/a.txt")
+                -- Call dofile
+                dofile("/tmp/a.lua")
+                -- Switch back
+                io.close()
+                print=oldprint
+
+                -- Send Result back
+                local hand=io.open("/tmp/a.txt","r")
+                local resText=hand:read("a")
+                hand:close()
+                local resLen=tostring(string.length(resText))
+                sock.send(resLen)
+                sock.send(resText)
+            end
+        end
+    end
+end
+
+function runSSH(ServerIP,ServerPort)
+    local x=component.internet.connect(ServerIP,ServerPort)
+    doRunSSH(x)
+    x.close()
+end