1#!/bin/bash 2# 设置 bridge 名称 3BRIDGE=dragonos-bridge 4# 设置网络信息 5NETWORK=192.168.137.0 6NETMASK=255.255.255.0 7GATEWAY=192.168.137.1 8DHCPRANGE=192.168.137.100,192.168.137.200 9# 启用PXE支持的可选参数 10TFTPROOT= 11BOOTP= 12 13function check_bridge() 14{ 15 if brctl show | grep "^$BRIDGE" &> /dev/null; then 16 return 1 17 else 18 return 0 19 fi 20} 21 22function create_bridge() 23{ 24 brctl addbr "$BRIDGE" 25 brctl stp "$BRIDGE" on 26 brctl setfd "$BRIDGE" 0 27 ifconfig "$BRIDGE" "$GATEWAY" netmask "$NETMASK" up 28} 29 30function enable_ip_forward() 31{ 32 echo 1 > /proc/sys/net/ipv4/ip_forward 33} 34 35function add_filter_rules() 36{ 37 iptables -t nat -A POSTROUTING -s "$NETWORK"/"$NETMASK" \ 38 ! -d "$NETWORK"/"$NETMASK" -j MASQUERADE 39} 40 41function start_dnsmasq() 42{ 43# 禁止重复运行dnsmasq 44 ps -ef | grep "dnsmasq" | grep -v "grep" &> /dev/null 45 if [ $? -eq 0 ]; then 46 echo "dnsmasq 已经在运行" 47 return 1 48 fi 49 dnsmasq \ 50 --strict-order \ 51 --except-interface=lo \ 52 --interface=$BRIDGE \ 53 --listen-address=$GATEWAY \ 54 --bind-interfaces \ 55 --dhcp-range=$DHCPRANGE \ 56 --conf-file="" \ 57 --pid-file=/var/run/qemu-dhcp-$BRIDGE.pid \ 58 --dhcp-leasefile=/var/run/qemu-dhcp-$BRIDGE.leases \ 59 --dhcp-no-override \ 60 ${TFTPROOT:+"--enable-tftp"} \ 61 ${TFTPROOT:+"--tftp-root=$TFTPROOT"} \ 62 ${BOOTP:+"--dhcp-boot=$BOOTP"} 63} 64 65function setup_bridge_nat() 66{ 67 check_bridge "$BRIDGE" 68 if [ $? -eq 0 ]; then 69 create_bridge 70 fi 71 enable_ip_forward 72 add_filter_rules "$BRIDGE" 73 start_dnsmasq "$BRIDGE" 74} 75 76# 安装前需要检查$1参数 77if [ -n "$1" ]; then 78 setup_bridge_nat 79 brctl addif "$BRIDGE" "$1" 80 ifconfig "$1" 0.0.0.0 up 81 exit 0 82else 83 echo "发现错误：没有指定接口" 84 exit 1 85fi 86