177 lines
4.8 KiB
Bash
177 lines
4.8 KiB
Bash
#!/usr/bin/env bash
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# https://github.com/hetzneronline/installimage/blob/master/network_config.functions.sh
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#
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# network config functions
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#
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# (c) 2017-2021, Hetzner Online GmbH
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#
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# list network interfaces
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network_interfaces() {
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for file in /sys/class/net/*; do
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echo "${file##*/}"
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done
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}
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# check whether network interface is virtual
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# $1 <network_interface>
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network_interface_is_virtual() {
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local network_interface="$1"
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[[ -d "/sys/devices/virtual/net/$network_interface" ]]
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}
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# list physical network interfaces
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physical_network_interfaces() {
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while read network_interface; do
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network_interface_is_virtual "$network_interface" && continue
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echo "$network_interface"
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done < <(network_interfaces)
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}
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# conv int to ipv4 addr
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# $1 <int>
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int_to_ipv4_addr() {
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local int="$1"
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echo "$(((int >> 24) & 0xff)).$(((int >> 16) & 0xff)).$(((int >> 8) & 0xff)).$((int & 0xff))/32"
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}
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# check whether network contains ipv4 addr
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# $1 <network>
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# $2 <ipv4_addr>
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network_contains_ipv4_addr() {
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local network="$1"
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local ipv4_addr="$2"
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ipv4_addr="$(ip_addr_without_suffix "$ipv4_addr")/$(ip_addr_suffix "$network")"
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[[ "$(ipv4_addr_network "$ipv4_addr")" == "$network" ]]
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}
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# check whether ipv4 addr is private
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# $1 <ipv4_addr>
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ipv4_addr_is_private() {
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local ipv4_addr="$1"
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network_contains_ipv4_addr 10.0.0.0/8 "$ipv4_addr" ||
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network_contains_ipv4_addr 172.16.0.0/12 "$ipv4_addr" ||
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network_contains_ipv4_addr 192.168.0.0/16 "$ipv4_addr"
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}
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# conv ipv4 addr to int
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# $1 <ipv4_addr>
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ipv4_addr_to_int() {
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local ipv4_addr="$1"
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local ipv4_addr_without_suffix="$(ip_addr_without_suffix "$ipv4_addr")"
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{ IFS=. read a b c d; } <<< "$ipv4_addr_without_suffix"
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echo "$(((((((a << 8) | b) << 8) | c) << 8) | d))"
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}
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# calc ipv4 addr netmask
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# $1 <ipv4_addr>
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ipv4_addr_netmask() {
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local ipv4_addr="$1"
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local ipv4_addr_suffix="$(ip_addr_suffix "$ipv4_addr")"
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ip_addr_without_suffix "$(int_to_ipv4_addr "$((0xffffffff << (32 - ipv4_addr_suffix)))")"
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}
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# get ip addr suffix
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# $1 <ip_addr>
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ip_addr_suffix() {
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local ip_addr="$1"
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if [[ "$ip_addr" =~ / ]]; then
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echo "${ip_addr##*/}"
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# assume /32 unless $ip_addr contains /
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else
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echo 32
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fi
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}
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# get ip addr without suffix
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# $1 <ip_addr>
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ip_addr_without_suffix() {
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local ip_addr="$1"
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echo "${ip_addr%%/*}"
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}
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# calc ipv4 addr network
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# $1 <ipv4_addr>
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ipv4_addr_network() {
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local ipv4_addr="$1"
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local ipv4_addr_suffix="$(ip_addr_suffix "$ipv4_addr")"
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local int="$(ipv4_addr_to_int "$ipv4_addr")"
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local network_without_suffix="$(ip_addr_without_suffix "$(int_to_ipv4_addr "$((int & (0xffffffff << (32 - ipv4_addr_suffix))))")")"
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echo "$network_without_suffix/$ipv4_addr_suffix"
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}
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# check whether network contains ipv4 addr
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# $1 <network>
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# $2 <ipv4_addr>
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network_contains_ipv4_addr() {
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local network="$1"
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local ipv4_addr="$2"
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ipv4_addr="$(ip_addr_without_suffix "$ipv4_addr")/$(ip_addr_suffix "$network")"
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[[ "$(ipv4_addr_network "$ipv4_addr")" == "$network" ]]
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}
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# check whether ipv4 addr is a shared addr (rfc6598)
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# $1 <ipv4_addr>
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ipv4_addr_is_shared_addr() {
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local ipv4_addr="$1"
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network_contains_ipv4_addr 100.64.0.0/10 "$ipv4_addr"
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}
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# check if ipv4 addr is reserved for future use
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ipv4_addr_is_reserved_for_future_use() {
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local ipv4_addr="$1"
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network_contains_ipv4_addr 240.0.0.0/4 "$ipv4_addr"
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}
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# get network interface ipv4 addrs
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# $1 <network_interface>
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network_interface_ipv4_addrs() {
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local network_interface="$1"
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while read line; do
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[[ "$line" =~ ^\ *inet\ ([^\ ]+) ]] || continue
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local ipv4_addr="${BASH_REMATCH[1]}"
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# ignore shared addrs
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ipv4_addr_is_shared_addr "$ipv4_addr" && continue
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# ignore addrs reserved for future use
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ipv4_addr_is_reserved_for_future_use "$ipv4_addr" && continue
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echo "$ipv4_addr"
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done < <(ip -4 a s "$network_interface")
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}
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# get network interface ipv4 gateway
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# $1 <network_interface>
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network_interface_ipv4_gateway() {
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local network_interface="$1"
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[[ "$(ip -4 r l 0/0 dev "$network_interface")" =~ ^default\ via\ ([^\ $'\n']+) ]] && echo "${BASH_REMATCH[1]}"
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}
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# get network interface ipv6 gateway
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# $1 <network_interface>
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network_interface_ipv6_gateway() {
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local network_interface="$1"
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[[ "$(ip -6 r l ::/0 dev "$network_interface")" =~ ^default\ via\ ([^\ $'\n']+) ]] && echo "${BASH_REMATCH[1]}"
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}
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# check whether ipv6 addr is a link local unicast addr
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# $1 <ipv6_addr>
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ipv6_addr_is_link_local_unicast_addr() {
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local ipv6_addr="$1"
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[[ "$ipv6_addr" =~ ^fe80: ]]
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}
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# get network interface ipv6 addrs
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# $1 <network_interface>
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network_interface_ipv6_addrs() {
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# "hide" v6 if IPV4_ONLY set
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((IPV4_ONLY == 1)) && return
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local network_interface="$1"
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while read line; do
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[[ "$line" =~ ^\ *inet6\ ([^\ ]+) ]] || continue
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local ipv6_addr="${BASH_REMATCH[1]}"
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# ignore link local unicast addrs
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ipv6_addr_is_link_local_unicast_addr "$ipv6_addr" && continue
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echo "$ipv6_addr"
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done < <(ip -6 a s "$network_interface")
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}
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