# This file was contributed to the Volatility Framework Version 3.
# Copyright (C) 2018 Volatility Foundation.
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"""A module containing a collection of plugins that produce data
typically found in Linux's /proc file system.
"""

from typing import List

from volatility.framework import renderers, interfaces
from volatility.framework.configuration import requirements
from volatility.framework.interfaces import plugins
from volatility.framework.objects import utility
from volatility.framework.renderers import format_hints
from volatility.plugins.linux import pslist


class Elfs(plugins.PluginInterface):
    """Lists all memory mapped ELF files for all processes"""

    @classmethod
    def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
        return [
            requirements.TranslationLayerRequirement(
                name = 'primary', description = 'Memory layer for the kernel', architectures = ["Intel32", "Intel64"]),
            requirements.SymbolTableRequirement(name = "vmlinux", description = "Linux kernel symbols")
        ]

    def _generator(self, tasks):
        for task in tasks:
            proc_layer_name = task.add_process_layer()
            if not proc_layer_name:
                continue

            proc_layer = self.context.memory[proc_layer_name]

            name = utility.array_to_string(task.comm)

            for vma in task.mm.get_mmap_iter():
                hdr = proc_layer.read(vma.vm_start, 4, pad = True)
                if not (hdr[0] == 0x7f and hdr[1] == 0x45 and hdr[2] == 0x4c and hdr[3] == 0x46):
                    continue

                path = vma.get_name(self.context, task)

                yield (0, (task.pid, name, format_hints.Hex(vma.vm_start), format_hints.Hex(vma.vm_end), path))

    def run(self):
        filter_func = pslist.PsList.create_filter([self.config.get('pid', None)])

        plugin = pslist.PsList.list_tasks

        return renderers.TreeGrid(
            [("PID", int), ("Process", str), ("Start", format_hints.Hex), ("End", format_hints.Hex),
             ("File Path", str)],
            self._generator(plugin(self.context, self.config['primary'], self.config['vmlinux'], filter = filter_func)))