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Remove restrictions based on file extension when listing images and fix ELF header checks

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grossmj committed 2024-11-27 14:51:34 +10:00
1 parent 83921a45df
commit 3d58b437b4
2 files changed
+99 -58
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gns3server/utils/images.py
+44 -28
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@@ -45,7 +45,7 @@ def list_images(emulator_type):
# We limit recursion to path outside the default images directory
# the reason is in the default directory manage file organization and
# it should be flatten to keep things simple
# it should be flat to keep things simple
recurse = True
if os.path.commonprefix([directory, general_images_directory]) == general_images_directory:
recurse = False
@@ -53,37 +53,53 @@ def list_images(emulator_type):
directory = os.path.normpath(directory)
for root, _, filenames in _os_walk(directory, recurse=recurse):
for filename in filenames:
if filename not in files:
if filename.endswith(".md5sum") or filename.startswith("."):
if filename in files:
log.warning("File {} has already been found, skipping...".format(filename))
continue
if filename.endswith(".md5sum") or filename.startswith("."):
continue
files.add(filename)
filesize = os.stat(os.path.join(root, filename)).st_size
if filesize < 7:
log.warning("File {} is too small to be an image, skipping...".format(filename))
continue
try:
with open(os.path.join(root, filename), "rb") as f:
# read the first 7 bytes of the file.
elf_header_start = f.read(7)
if emulator_type == "dynamips" and elf_header_start != b'\x7fELF\x01\x02\x01':
# IOS images must start with the ELF magic number, be 32-bit, big endian and have an ELF version of 1
log.warning("IOS image {} does not start with a valid ELF magic number, skipping...".format(filename))
continue
elif emulator_type == "iou" and elf_header_start != b'\x7fELF\x02\x01\x01' and elf_header_start != b'\x7fELF\x01\x01\x01':
# IOU images must start with the ELF magic number, be 32-bit or 64-bit, little endian and have an ELF version of 1
log.warning("IOU image {} does not start with a valid ELF magic number, skipping...".format(filename))
continue
elif emulator_type == "qemu" and elf_header_start[:4] == b'\x7fELF':
# QEMU images should not start with an ELF magic number
log.warning("QEMU image {} starts with an ELF magic number, skipping...".format(filename))
continue
elif ((filename.endswith(".image") or filename.endswith(".bin")) and emulator_type == "dynamips") \
or ((filename.endswith(".bin") or filename.startswith("i86bi")) and emulator_type == "iou") \
or (not filename.endswith(".bin") and not filename.endswith(".image") and emulator_type == "qemu"):
files.add(filename)
# It the image is located in the standard directory the path is relative
if os.path.commonprefix([root, default_directory]) != default_directory:
path = os.path.join(root, filename)
else:
path = os.path.relpath(os.path.join(root, filename), default_directory)
# It the image is located in the standard directory the path is relative
if os.path.commonprefix([root, default_directory]) != default_directory:
path = os.path.join(root, filename)
else:
path = os.path.relpath(os.path.join(root, filename), default_directory)
try:
if emulator_type in ["dynamips", "iou"]:
with open(os.path.join(root, filename), "rb") as f:
# read the first 7 bytes of the file.
elf_header_start = f.read(7)
# valid IOU or IOS images must start with the ELF magic number, be 32-bit or 64-bit,
# little endian and have an ELF version of 1
if elf_header_start != b'\x7fELF\x02\x01\x01' and elf_header_start != b'\x7fELF\x01\x01\x01':
continue
images.append(
{
"filename": filename,
"path": force_unix_path(path),
"md5sum": md5sum(os.path.join(root, filename)),
"filesize": filesize
}
)
images.append({
"filename": filename,
"path": force_unix_path(path),
"md5sum": md5sum(os.path.join(root, filename)),
"filesize": os.stat(os.path.join(root, filename)).st_size})
except OSError as e:
log.warning("Can't add image {}: {}".format(path, str(e)))
except OSError as e:
log.warning("Can't add image {}: {}".format(path, str(e)))
return images