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module VagrantPlugins
module GuestLinux
module Cap
class NetworkInterfaces
# Valid ethernet device prefix values.
# eth - classic prefix
# en - predictable interface names prefix
POSSIBLE_ETHERNET_PREFIXES = ["eth".freeze, "en".freeze].freeze
@@logger = Log4r::Logger.new("vagrant::guest::linux::network_interfaces")
# Get network interfaces as a list. The result will be something like:
#
# eth0\nenp0s8\nenp0s9
#
# @return [Array<String>]
def self.network_interfaces(machine, path = "/sbin/ip")
s = ""
machine.communicate.sudo("#{path} -o -0 addr | grep -v LOOPBACK | awk '{print $2}' | sed 's/://'") do |type, data|
s << data if type == :stdout
end
# In some cases net devices may be added to the guest and will not
# properly show up when using `ip`. This pulls any device information
# that can be found in /proc and adds it to the list of interfaces
s << "\n"
machine.communicate.sudo("cat /proc/net/dev | grep -E '^[a-z0-9 ]+:' | awk '{print $1}' | sed 's/://'", error_check: false) do |type, data|
s << data if type == :stdout
end
# Collect all loopback interfaces
los = ""
machine.communicate.sudo("#{path} -o -0 addr | grep LOOPBACK | awk '{print $2}' | sed 's/://'") do |type, data|
los << data if type == :stdout
end
loifaces = los.split("\n")
@@logger.debug("loopback interfaces: #{loifaces.inspect}")
ifaces = s.split("\n").reject { |x| x.empty? or loifaces.include?(x) }
@@logger.debug("Unsorted list: #{ifaces.inspect}")
# Break out integers from strings and sort the arrays to provide
# a natural sort for the interface names
# NOTE: Devices named with a hex value suffix will _not_ be sorted
# as expected. This is generally seen with veth* devices, and proper ordering
# is currently not required
ifaces = ifaces.map do |iface|
iface.scan(/(.+?)(\d+)?/).flatten.map do |iface_part|
if iface_part.to_i.to_s == iface_part
iface_part.to_i
else
iface_part
end
end
end
ifaces = ifaces.uniq.sort do |lhs, rhs|
result = 0
slice_length = [rhs.size, lhs.size].min
slice_length.times do |idx|
if(lhs[idx].is_a?(rhs[idx].class))
result = lhs[idx] <=> rhs[idx]
elsif(lhs[idx].is_a?(String))
result = 1
else
result = -1
end
break if result != 0
end
result
end.map(&:join)
@@logger.debug("Sorted list: #{ifaces.inspect}")
# Extract ethernet devices and place at start of list
resorted_ifaces = []
resorted_ifaces += ifaces.find_all do |iface|
POSSIBLE_ETHERNET_PREFIXES.any?{|prefix| iface.start_with?(prefix)} &&
iface.match(/^[a-zA-Z0-9]+$/)
end
resorted_ifaces += ifaces - resorted_ifaces
ifaces = resorted_ifaces
@@logger.debug("Ethernet preferred sorted list: #{ifaces.inspect}")
ifaces
end
end
end
end
end
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