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Code Issues Releases Wiki Activity

Check for valid IOS & IOU image paths and files (by analyzing the firt 7

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bytes of their ELF header).
This commit is contained in:
grossmj 2014-04-26 22:04:22 -06:00
parent 28ca12367a
commit 85336e0fca
2 changed files with 31 additions and 2 deletions
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14
gns3server/modules/dynamips/nodes/router.py
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@ -271,6 +271,20 @@ class Router(object):
self.resume()
else:
if not os.path.isfile(self._image):
raise DynamipsError("IOS image '{}' is not accessible".format(self._image))
try:
with open(self._image, "rb") as f:
# read the first 7 bytes of the file.
elf_header_start = f.read(7)
except OSError as e:
raise DynamipsError("Cannot read ELF header for IOS image {}: {}".format(self._image, e))
# IOS images must start with the ELF magic number, be 32-bit, big endian and have an ELF version of 1
if elf_header_start != b'\x7fELF\x01\x02\x01':
raise DynamipsError("'{}' is not a valid IOU image".format(self._image))
if self.console and self.aux:
# check that console and aux ports are available
try:

19
gns3server/modules/iou/iou_device.py
View File

@ -414,8 +414,23 @@ class IOUDevice(object):
if not self.is_running():
if not os.path.isfile(self._path):
raise IOUError("IOU '{}' is not accessible".format(self._path))
if not os.path.isfile(iou_path):
raise IOUError("IOU image '{}' is not accessible".format(iou_path))
try:
with open(iou_path, "rb") as f:
# read the first 7 bytes of the file.
elf_header_start = f.read(7)
except OSError as e:
raise IOUError("Cannot read ELF header for IOU image '{}': {}".format(self._path, e))
# IOU images must start with the ELF magic number, be 32-bit, little endian
# and have an ELF version of 1 normal IOS image are big endian!
if elf_header_start != b'\x7fELF\x01\x01\x01':
raise IOUError("'{}' is not a valid IOU image".format(self._path))
if not os.access(self._path, os.X_OK):
raise IOUError("IOU image '{}' is not executable".format(self._path))
if not self._iourc or not os.path.isfile(self._iourc):
raise IOUError("A iourc file is necessary to start IOU")