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67 lines
1.7 KiB
Bash
67 lines
1.7 KiB
Bash
#!/bin/bash
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# 验证IPv4地址格式
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function is_valid_ipv4() {
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local ip=$1
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local IFS='.'
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local -a octets
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[[ ! $ip =~ ^([0-9]+\.){3}[0-9]+$ ]] && return 1
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read -r -a octets <<<"$ip"
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[ "${#octets[@]}" -ne 4 ] && return 1
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for octet in "${octets[@]}"; do
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if ! [[ "$octet" =~ ^[0-9]+$ ]] || ((octet < 0 || octet > 255)); then
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return 1
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fi
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done
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return 0
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}
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# 验证IPv6地址格式
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function is_valid_ipv6() {
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local ip=$1
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if [[ ! $ip =~ ^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$ ]] &&
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[[ ! $ip =~ ^(([0-9a-fA-F]{0,4}:){0,7}:|(:[0-9a-fA-F]{0,4}:){0,6}:[0-9a-fA-F]{0,4})$ ]]; then
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return 1
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fi
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return 0
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}
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# 验证IP地址是否为有效的IPv4或IPv6
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function is_valid_ip() {
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is_valid_ipv4 "$1" || is_valid_ipv6 "$1"
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}
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# 检查参数
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[ $# -lt 1 ] && echo "Usage: $0 <IP address>" && exit 1
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! is_valid_ip "$1" && echo "$1 is not a valid IP address." && exit 1
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# 获取网络接口和硬件端口
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nic=$(route -n get default | grep "interface" | awk '{print $2}')
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hardware_port=$(networksetup -listallhardwareports | awk -v dev="$nic" '
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/Hardware Port:/{port=$0; gsub("Hardware Port: ", "", port)}
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/Device: /{if ($2 == dev) {print port; exit}}
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')
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# 获取当前DNS设置
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original_dns=$(networksetup -getdnsservers "$hardware_port")
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# 检查当前DNS设置是否有效
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is_valid_dns=false
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for ip in $original_dns; do
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ip=$(echo "$ip" | tr -d '[:space:]')
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if [ -n "$ip" ] && (is_valid_ipv4 "$ip" || is_valid_ipv6 "$ip"); then
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is_valid_dns=true
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break
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fi
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done
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# 更新DNS设置
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if [ "$is_valid_dns" = false ]; then
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echo "empty" >.original_dns.txt
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else
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echo "$original_dns" >.original_dns.txt
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fi
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networksetup -setdnsservers "$hardware_port" "$1"
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