antivirus core

-- This is a comment
-- to help deter certain viruses
-- which hide their code in the header of programs

local function helpInstructions()
    if term.isColor() then
        term.setTextColor(colors.yellow)
    end
    print("Reinstallation instructions:")
    print("Find an uninfected computer, turn on the computer, " ..
        "insert this disk, and run:")
    print("\"pastebin run qhvYyj6N\".")
    print("")
    if term.isColor() then
        term.setTextColor(colors.white)
    end
    print("Press any key to attempt shutdown...")
    os.pullEvent("key")
    os.shutdown()
end

local function labelInfected(unknown)
    local side = nil
    for _, v in pairs(peripheral.getNames()) do
        if peripheral.getType(v) == "drive" and
            peripheral.call(v, "hasData") then
            if peripheral.call(v, "getMountPath") == "disk" or unknown then
                side = v
                break
            end
        end
    end

    if side then
        peripheral.call(side, "setDiskLabel", "[INFECTED] Rescue Boot Disk")
    end
end

if term.isColor() then
    term.setTextColor(colors.lightBlue)
end

term.clear()
term.setCursorPos(1, 1)
print("Running 1lann's Rescue Boot Disk v1.0")
print("")

if os.clock() > 1 then
    if term.isColor() then
        term.setTextColor(colors.red)
    end
    print("This boot disk did not run on boot!")
    print("It may now be infected.")
    print("")
    helpInstructions()
end

if not shell or shell.getRunningProgram() ~= "disk/startup" then
    if #(shell.getRunningProgram()) > 4 then
        if (shell.getRunningProgram()):sub(1, 4) == "disk" then
            if fs.exists("/disk") then
                pcall(fs.delete, "/disk")
            else
                if term.isColor() then
                    term.setTextColor(colors.yellow)
                end
                pcall(fs.delete, shell.getRunningProgram())
                print("The boot disk is infected!")
                print("")
                print("Reason: Program is running on /diskN rather " ..
                    "than /disk, and /disk does not exist.")
                print("")
                pcall(labelInfected, true)
                helpInstructions()
            end

            if term.isColor() then
                term.setTextColor(colors.yellow)
            end
            print("The boot disk is potentially infected. Try rebooting " ..
                "this computer, and if you see this message again, the boot " ..
                "disk is (probably) infected.")
            print("")
            print("Reason: Program is running on /diskN rather than /disk.")
            print("")
            helpInstructions()
        end
    end

    if term.isColor() then
        term.setTextColor(colors.red)
    end
    pcall(fs.delete, shell.getRunningProgram())
    print("This boot disk is (probably) infected!")
    print("")
    print("Reason: This program is not running on /disk/startup.")
    print("As a result, this program will self-destruct.")
    print("")
    helpInstructions()
end

local contents = http.get("http://pastebin.com/raw.php?i=BvvkvEp4")
if not contents then
    if term.isColor() then
        term.setTextColor(colors.red)
    end
    print("Could not connect to pastebin! If pastebin works on an " ..
        "uninfected computer, this disk may be infected.")
    print("")
    pcall(labelInfected)
    helpInstructions()
end

local f = io.open(shell.getRunningProgram(), "r")
local thisFile = f:read("*a")
f:close()

if contents.readAll() ~= thisFile then
    if term.isColor() then
        term.setTextColor(colors.red)
    end
    print("This boot disk is infected!")
    print("")
    print("Reason: Program contents does not match pastebin version.")
    print("")
    pcall(labelInfected)
    helpInstructions()
end

local _, err = pcall(error, "", 17)
if #err > 0 then
    if term.isColor() then
        term.setTextColor(colors.red)
    end
    print("This boot disk is infected!")
    print("")
    print("Reason: Stack trace signature does not match expected signature.")
    print("")
    pcall(labelInfected)
    helpInstructions()
end

if term.isColor() then
    term.setTextColor(colors.lime)
end
print("Boot verification successful!")
if term.isColor() then
    term.setTextColor(colors.yellow)
end
print("Scanning and cleaning...")
print("")

local systemNames  = fs.list("/rom/programs")
local names = {"cp", "dir", "ls", "mv", "rm", "gps", "help", "adventure", "hello", "worm", "pastebin", "dance", "excavate", "go", "tunnel", "turn", "list"}
for i = 1, #names do table.insert(systemNames, names[i]) end

local function isSystemName(name)
    for _, v in pairs(systemNames) do
        if v == name and v ~= "startup" then
            return true
        end
    end
    return false
end

if fs.exists("/infected") and not fs.isDir("/infected") then
    fs.delete("/infected")
end

if not fs.exists("/infected") then
    fs.makeDir("/infected")
end

local hidden = {}
local traps = {}
for k,v in pairs(fs.list("/")) do
    if isSystemName(v) then
        table.insert(traps, v)
        if fs.exists("/infected/infected_" .. v) then
            pcall(fs.delete, "/infected/infected_" .. v)
        end
        pcall(fs.move, "/" .. v, "/infected/infected_" .. v)
    end

    if v:sub(1, 1) == "." then
        table.insert(hidden, v)
    end
end

local problems = false

if #traps > 0 then
    problems = true
    if term.isColor() then
        term.setTextColor(colors.yellow)
    end
    print("The following traps were found:")
    for _, v in pairs(traps) do
        write(v .. ", ")
    end
    print("")
    print("These traps have been moved to /infected")
    print("")
end

if #hidden > 0 then
    if term.isColor() then
        term.setTextColor(colors.yellow)
    end
    print("The following hidden files were found:")
    for _, v in pairs(hidden) do
        write(v .. ", ")
    end
    print("")
    print("")
end

if fs.exists("/startup") then
    problems = true
    if fs.exists("/infected/infected_startup") then
        pcall(fs.delete, "/infected/infected_startup")
    end
    pcall(fs.move, "/startup", "/infected/infected_startup")

    if term.isColor() then
        term.setTextColor(colors.yellow)
    end
    print("The computer's startup file has been moved to /infected")
    print("")
end

if term.isColor() then
    term.setTextColor(colors.lime)
end

if problems then
    print("Scan and clean complete! This computer should now be disinfected.")
    if term.isColor() then
        term.setTextColor(colors.red)
    end
    print("Non-critical files left on the computer may be infected! Please " ..
        "check them before running them.")
else
    print("Scan completed! No significant problems found.")
end

-- This is a comment
-- to help deter certain viruses
-- which hide their code in the footer of programs