| Current File : //usr/local/jetapps/usr/share/rear/lib/network-functions.sh |
#
# ReaR networking functions.
#
# MASKS, prefix2netmask, num2ip, and get_device_by_hwaddr
# are originally from an old fedora-14 dhclient-script
# that was there used for DHCP setup and is still used in ReaR
# for DHCP setup in skel/default/etc/scripts/dhcp-setup-functions.sh
# cf. https://github.com/rear/rear/issues/1517
NETMASKS_BINARY=( 0
10000000000000000000000000000000
11000000000000000000000000000000
11100000000000000000000000000000
11110000000000000000000000000000
11111000000000000000000000000000
11111100000000000000000000000000
11111110000000000000000000000000
11111111000000000000000000000000
11111111100000000000000000000000
11111111110000000000000000000000
11111111111000000000000000000000
11111111111100000000000000000000
11111111111110000000000000000000
11111111111111000000000000000000
11111111111111100000000000000000
11111111111111110000000000000000
11111111111111111000000000000000
11111111111111111100000000000000
11111111111111111110000000000000
11111111111111111111000000000000
11111111111111111111100000000000
11111111111111111111110000000000
11111111111111111111111000000000
11111111111111111111111100000000
11111111111111111111111110000000
11111111111111111111111111000000
11111111111111111111111111100000
11111111111111111111111111110000
11111111111111111111111111111000
11111111111111111111111111111100
11111111111111111111111111111110
11111111111111111111111111111111
-1 )
NETMASKS_DECIMAL=( $( for mask in "${NETMASKS_BINARY[@]}" ; do echo "ibase=2 ; $mask" | bc -l ; done ) )
# NETMASKS_DECIMAL is the same as
# MASKS=( 0
# 2147483648 3221225472 3758096384 4026531840
# 4160749568 4227858432 4261412864 4278190080
# 4286578688 4290772992 4292870144 4293918720
# 4294443008 4294705152 4294836224 4294901760
# 4294934528 4294950912 4294959104 4294963200
# 4294965248 4294966272 4294966784 4294967040
# 4294967168 4294967232 4294967264 4294967280
# 4294967288 4294967292 4294967294 4294967295
# -1 )
# and those numbers match the following IP addresses according to the output of
# for mask in "${NETMASKS_DECIMAL[@]}" ; do num2ip $mask ; done
# 0.0.0.0
# 128.0.0.0 192.0.0.0 224.0.0.0 240.0.0.0
# 248.0.0.0 252.0.0.0 254.0.0.0 255.0.0.0
# 255.128.0.0 255.192.0.0 255.224.0.0 255.240.0.0
# 255.248.0.0 255.252.0.0 255.254.0.0 255.255.0.0
# 255.255.128.0 255.255.192.0 255.255.224.0 255.255.240.0
# 255.255.248.0 255.255.252.0 255.255.254.0 255.255.255.0
# 255.255.255.128 255.255.255.192 255.255.255.224 255.255.255.240
# 255.255.255.248 255.255.255.252 255.255.255.254 255.255.255.255
# 255.255.255.255
# Output the IP address that match a decimal number:
function num2ip () {
local num=$1
let octet1="(num >> 24) & 0xff"
let octet2="(num >> 16) & 0xff"
let octet3="(num >> 8) & 0xff"
let octet4="num & 0xff"
echo $octet1.$octet2.$octet3.$octet4
}
# Output the netmask in IP address format nnn.nnn.nnn.nnn for a prefix, for example:
# prefix2netmask 1 results 128.0.0.0
# prefix2netmask 2 results 192.0.0.0
# prefix2netmask 8 results 255.0.0.0
# prefix2netmask 16 results 255.255.0.0
# prefix2netmask 24 results 255.255.255.0
function prefix2netmask () {
local prefix=$1
test $prefix -gt 32 && BugError "function prefix2netmask() called with prefix '$prefix' > 32"
num2ip ${NETMASKS_DECIMAL[$prefix]}
}
# Output all network interfaces (here falsely called 'device' and even in singular)
# each one on a separated line (i.e. each one separated by '\n')
# that belong to a hardware address (MAC address), for example on commandline:
# # hwaddr="64:00:6A:64:C0:06"
# # ip -o link | grep -v 'link/ieee802.11' | grep -i "$hwaddr"
# 2: eth0: ... link/ether 64:00:6a:64:c0:06 ...
# 3: br0: ... link/ether 64:00:6a:64:c0:06 ...
# # ip -o link | grep -v 'link/ieee802.11' | grep -i "$hwaddr" | awk -F ": " '{print $2}'
# eth0
# br0
function get_device_by_hwaddr () {
local hwaddr="$1"
ip -o link | grep -v 'link/ieee802.11' | grep -i "$hwaddr" | awk -F ": " '{print $2}'
}
# Return 0 if args is a valid IPV4 ip_address
function is_ip () {
local test_ip=$1
[ -z "$test_ip" ] && BugError "function is_ip() called without argument."
# ip_pattern variable is used to store a regex which validate an IPV4 address: "[0 to 255].[0 to 255].[0 to 255].[0 to 255]".
local ip_pattern="^(([0-9]{1,2}|1[0-9]{2}|2([0-4][0-9]|5[0-5]))\.){3}([0-9]{1,2}|1[0-9]{2}|2([0-4][0-9]|5[0-5]))$"
# $ip_pattern MUST NOT be quoted. Using a variable to store regex is used here to assure
# compatibility with pre-3.2 bash version (SLES10).
if [[ "$test_ip" =~ $ip_pattern ]] ; then
return 0
else
return 1
fi
}
# function which get the ipv4 address from a fqdn
function get_ip_from_fqdn () {
local fqdn=$1
[ -z "$fqdn" ] && BugError "function get_ip_from_name() called without argument."
# Get a list of potential IPs that resolve $fqdn
ip=( $(getent ahostsv4 $fqdn) ) || Error "Could not resolve $fqdn to IP"
# Check if $ip is a valid IP
is_ip "$ip" || Error "Got '$ip' from resolving $fqdn which is not an IP"
Log "$fqdn resolved to $ip"
echo "$ip"
}
function linearize_interfaces_file () {
# Transform each network_file (debian network interfaces files) into temporary one_line_interfaces file
# for easier sed substitution.
# ex:
#auto eth1
#iface eth1 inet static
# address 9.9.9.9
# netmask 255.255.255.0
#
# will become: auto eth1;iface eth1 inet static;address 9.9.9.9;netmask 255.255.255.0;
interfaces_file=$1
test -z $interfaces_file && Error "debian_linearize_interface function called without argument (file_to_migrate)"
awk '
/^#/ {print}
!/^ *$/ && !/^ *$/ && !/^#/ { PRINT=1 ; gsub("^ *","") ; ITEM=ITEM $0";" }
(/^ *$/ || /^ *$/ || /^#/ ) && PRINT==1 { print ITEM ; ITEM="" ; PRINT=0 }
END { if( ITEM!="" ) print ITEM }
' < "$interfaces_file"
}
function rebuild_interfaces_file_from_linearized () {
# recreate a Debian/ubuntu network interafces files from a linearized file (see linearize_interfaces_file).
# It is the opposite version of linearize_interfaces_file function.
linearized_interfaces_file=$1
test -z $interfaces_file && Error "rebuild_interfaces_file_from_linearized function called without argument (file_to_migrate)"
awk -F\; '
{
INDENT=0
for(i=1;i<=NF;i++) {
if ($i ~ /^iface/) {
print $i
INDENT=1
}
else {
if (INDENT == 1) print " "$i ; else print $i
}
}
}
' < $linearized_interfaces_file
}
function is_persistent_ethernet_name () {
# this function is borrowed from /usr/lib/dracut/modules.d/40network/net-lib.sh (from CentOS 7)
local _netif="$1"
local _name_assign_type="0"
[ -f "/sys/class/net/$_netif/name_assign_type" ] \
&& _name_assign_type=$(cat "/sys/class/net/$_netif/name_assign_type")
# NET_NAME_ENUM 1
[ "$_name_assign_type" = "1" ] && return 1
# NET_NAME_PREDICTABLE 2
[ "$_name_assign_type" = "2" ] && return 0
case "$_netif" in
# udev persistent interface names
eno[0-9]|eno[0-9][0-9]|eno[0-9][0-9][0-9]*)
;;
ens[0-9]|ens[0-9][0-9]|ens[0-9][0-9][0-9]*)
;;
enp[0-9]s[0-9]*|enp[0-9][0-9]s[0-9]*|enp[0-9][0-9][0-9]*s[0-9]*)
;;
enP*p[0-9]s[0-9]*|enP*p[0-9][0-9]s[0-9]*|enP*p[0-9][0-9][0-9]*s[0-9]*)
;;
# biosdevname
em[0-9]|em[0-9][0-9]|em[0-9][0-9][0-9]*)
;;
p[0-9]p[0-9]*|p[0-9][0-9]p[0-9]*|p[0-9][0-9][0-9]*p[0-9]*)
;;
*)
return 1
esac
return 0
}