mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
mike.auty@gmail.com
95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
# Volatility
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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@author: Andrew Case
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@license: GNU General Public License 2.0 or later
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@contact: atcuno@gmail.com
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@organization: Digital Forensics Solutions
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"""
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import volatility.obj as obj
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import volatility.plugins.linux.common as linux_common
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class linux_dmesg(linux_common.AbstractLinuxCommand):
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"""Gather dmesg buffer"""
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def _get_log_info(self):
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ptr_addr = self.get_profile_symbol("log_buf")
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log_buf_addr = obj.Object("unsigned long", offset = ptr_addr, vm = self.addr_space)
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log_buf_len = obj.Object("int", self.get_profile_symbol("log_buf_len"), vm = self.addr_space)
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return (log_buf_addr, log_buf_len)
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# pre 3.x
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def _pre_3(self, buf_addr, buf_len):
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return obj.Object("String", offset = buf_addr, vm = self.addr_space, length = buf_len)
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def _ver_3(self, buf_addr, buf_len):
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'''
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During 3.x, the kernel switched the kernel debug buffer from just a big char array to the variable now
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holding variable sized records tracked by inline 'log' structures
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We deal with this by walking all the logs and building the buffer up and then returning it
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This produces the same results as the old way
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'''
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ret = ""
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size_of_log = self.profile.get_obj_size("log")
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cur_addr = buf_addr
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end_addr = buf_addr + buf_len
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log = obj.Object("log", offset = cur_addr, vm = self.addr_space)
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cur_len = log.len
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while cur_addr < end_addr and cur_len != 0:
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msg_len = log.text_len
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cur_ts = log.ts_nsec
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buf = obj.Object("String", offset = cur_addr + size_of_log, vm = self.addr_space, length = msg_len)
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ret = ret + "[{0}.{1}] {2}\n".format(cur_ts, cur_ts / 1000000000, buf)
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cur_addr = cur_addr + cur_len
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log = obj.Object("log", offset = cur_addr, vm = self.addr_space)
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cur_len = log.len
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return ret
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def calculate(self):
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linux_common.set_plugin_members(self)
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(log_buf_addr, log_buf_len) = self._get_log_info()
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if self.profile.has_type("log") and self.profile.obj_has_member("log", "ts_nsec"):
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yield self._ver_3(log_buf_addr, log_buf_len)
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else:
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yield self._pre_3(log_buf_addr, log_buf_len)
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def render_text(self, outfd, data):
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for buf in data:
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outfd.write("{0:s}\n".format(buf))
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