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"""
Network introspection utilities using ioctl and the /proc filesystem.
"""
import os
from landscape.lib.fs import read_text_file
DMI_FILES = ("sys_vendor", "chassis_vendor", "bios_vendor", "product_name")
def get_vm_info(root_path="/"):
"""
Return a bytestring with the virtualization type if it's known, an empty
bytestring otherwise.
It loops through some possible configurations and return a bytestring with
the name of the technology being used or None if there's no match
"""
if _is_vm_openvz(root_path):
return b"openvz"
if _is_vm_xen(root_path):
return b"xen"
# Iterate through all dmi *_vendors, as clouds can (and will) customize
# sysinfo values. (https://libvirt.org/formatdomain.html#elementsSysinfo)
dmi_info_path = os.path.join(root_path, "sys/class/dmi/id")
for dmi_info_file in DMI_FILES:
dmi_vendor_path = os.path.join(dmi_info_path, dmi_info_file)
if not os.path.exists(dmi_vendor_path):
continue
vendor = _get_vm_by_vendor(dmi_vendor_path)
if vendor:
return vendor
return _get_vm_legacy(root_path)
def get_container_info(run_path="/run"):
"""
Return a string with the type of container the client is running in, if
any, an empty string otherwise.
"""
for filename in ("container_type", "systemd/container"):
path = os.path.join(run_path, filename)
if os.path.exists(path):
return read_text_file(path).strip()
return ""
def _is_vm_xen(root_path):
"""Check if the host is virtualized with Xen."""
sys_xen_path = os.path.join(root_path, "sys/bus/xen/devices")
# Paravirtualized and HVM instances have device links under the directory
return os.path.isdir(sys_xen_path) and os.listdir(sys_xen_path)
def _is_vm_openvz(root_path):
"""Check if the host is virtualized with OpenVZ."""
return os.path.exists(os.path.join(root_path, "proc/vz"))
def _get_vm_by_vendor(sys_vendor_path):
"""Return the VM type byte string (possibly empty) based on the vendor."""
vendor = read_text_file(sys_vendor_path).lower()
# Use lower-key string for vendors, since we do case-insentive match.
# We need bytes here as required by the message schema.
# 2018-01: AWS and DO are now returning custom sys_vendor names
# instead of qemu. If this becomes a trend, it may be worth also checking
# dmi/id/chassis_vendor which seems to unchanged (bochs).
content_vendors_map = (
("amazon ec2", b"kvm"),
("bochs", b"kvm"),
("digitalocean", b"kvm"),
("google", b"gce"),
("innotek", b"virtualbox"),
("microsoft", b"hyperv"),
("nutanix", b"kvm"),
("openstack", b"kvm"),
("qemu", b"kvm"),
("kvm", b"kvm"),
("vmware", b"vmware"))
for name, vm_type in content_vendors_map:
if name in vendor:
return vm_type
return b""
def _get_vm_legacy(root_path):
"""Check if the host is virtualized looking at /proc/cpuinfo content."""
try:
cpuinfo = read_text_file(os.path.join(root_path, "proc/cpuinfo"))
except (IOError, OSError):
return b""
if "qemu" in cpuinfo:
return b"kvm"
return b""
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