mirror of
https://github.com/sipeed/NanoKVM.git
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59a03cacef
To prevent some regions from not receiving the update package, add some DNS servers. However, please note that after setting a static IP, the /etc/resolv.conf file will be overwritten, and the old file will be stored as /etc/resolv.conf.old.
120 lines
4.0 KiB
Bash
Executable File
120 lines
4.0 KiB
Bash
Executable File
#!/bin/sh
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. /etc/profile
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# /boot/eth.nodhcp for example
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# ipaddr/net gw[optional]
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# 192.168.0.101/24 192.168.0.1
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# 192.168.3.116/22
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RESERVE_INET="192.168.0.1/24"
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start() {
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printf "start ethernet: "
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if [ -e /boot/eth.nodhcp ]
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then
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[ -e /boot/eth.nodhcp ] &&
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cat /boot/eth.nodhcp | while read inet gw
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do
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addr=${inet%/*}
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netid=${inet#*/}
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[ -z $gw ] &&
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gw=$( echo $addr| ( IFS='.' read a b c d; echo $((
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(((((($a<<8)+$b)<<8)+$c)<<8)+$d)
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& (((1<<$netid)-1)<<(32-$netid))
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))
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)) &&
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gw=$(($gw>>24&0xff)).$(($gw>>16&0xff)).$(($gw>>8&0xff)).$((1+( $gw>>0&0xff )))
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arping -Dqc2 -Ieth0 $addr || continue
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ip a add $inet brd + dev eth0
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ip r add default via $gw dev eth0
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cp -f /etc/resolv.conf /etc/resolv.conf.old
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cat > /etc/resolv.conf << EOF
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nameserver $gw
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nameserver 8.8.4.4
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nameserver 8.8.8.8
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nameserver 114.114.114.114
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nameserver 119.29.29.29
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nameserver 223.5.5.5
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EOF
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break
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done &&
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ip a show dev eth0|grep inet || (
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udhcpc -i eth0 -t 3 -T 1 -A 5 -b -p /run/udhcpc.eth0.pid &>/dev/null
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ip a show dev eth0|grep inet
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) || (
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# failed to apply dynamic addr, need a available static addr to visit the LAN
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inet=$RESERVE_INET
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addr=${inet%/*}
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ip a add $inet brd + dev eth0
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) || exit 1
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else
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(udhcpc -i eth0 -t 10 -T 1 -A 5 -b -p /run/udhcpc.eth0.pid) &
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fi
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echo "OK"
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}
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stop() {
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[[ ! -e "/run/udhcpc.eth0.pid" ]] && echo "udhcpc is not running..." && exit 1
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kill `cat /run/udhcpc.eth0.pid`
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rm /run/udhcpc.eth0.pid
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}
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case "$1" in
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start)
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start
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;;
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stop)
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stop
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;;
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restart|reload)
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$0 stop
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$0 start
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;;
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doc)
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cat <<EOF
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If you want to set your own static ip address
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rather then fetch it by dhcp.
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Then you need to create a file \`/boot/eth.nodhcp\`,
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and edit it following the format below:
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\`addr/netid gw[optional]\` in one line
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for example (support muti definations, checks with arp):
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1. 192.168.0.101/24 192.168.0.1
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2. 192.168.3.116/22
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Delete this file if you change to use dhcp default.
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ATTENTION: If all the STATIC address you set in the file is
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already in use on this LAN checked with arp, then none
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of them will be yours. And it will trigger dhcp, try to
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fetch DYNAMIC one. If it's also failed, your address will
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be the REVERSE one, 192.168.0.1/24. Just to be sure that
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you can visit your NanoKVM device through eth to fix some
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problems by ssh, unless you must disassemble it and modify
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or rewrite the TFCard once again.
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EOF
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echo ""
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cat <<EOF
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如果您想自行设置静态 ip 地址而不是使用 dhcp 来获取它。
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那么您需要新建一个文件 \`/boot/eth.nodhcp\`，然后按照以下格式编辑它：
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\`addr/netid gw[optional]\` 在一行内
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示例（支持多个预设，会通过 arp 检查是否占用）：
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1. 192.168.0.101/24 192.168.0.1
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2. 192.168.3.116/22
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如果您想改回默认 dhcp 获取 ip 地址的方式，删除该文件后即可恢复。
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注意：如果您预设的所有静态 ip 地址都被 arp 检测到已占用，则不会成功设置。
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此时会触发 dhcp 尝试获取 ip 地址，如果仍失败，那么最终会强制设置成
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192.168.90.1/24。这是为了保证您的 NanoKVM 设备总是能有一个可用的
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ip 地址，方便您通过局域网 ssh 连接设备进行一些修复，否则您可能需要
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拆开外壳以手动修改 TF 卡或重新烧卡。
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EOF
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;;
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*)
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echo "Usage: $0 {start|stop|restart}"
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exit 1
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esac
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