Java代码中对IP进行白名单验证
来自：https://www.cnblogs.com/shinubi/p/6723003.html
public class ipUtil { // IP的正则,这个正则不能验证第一组数字为0的情况
// private static Pattern pattern = Pattern
// .compile("(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
// + "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
// + "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
// + "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})");
private static Pattern pattern = Pattern
.compile("([1-9]\\d?|1\\d{2}|2[01]\\d|22[0-3])\\."
+ "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
+ "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
+ "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})");
/**
*
* getAvaliIpList:(根据IP白名单设置获取可用的IP列表).
*
* @date 2017-4-17 下午02:50:20
* @return
*/
private static Set<String> getAvaliIpList(String allowIp) {
Set<String> ipList = new HashSet<String>();
for (String allow : allowIp.replaceAll("\\s", "").split(",")) {
if (allow.indexOf("*") > -1) {
String[] ips = allow.split("\\.");
String[] from = new String[] { "0", "0", "0", "0" };
String[] end = new String[] { "255", "255", "255", "255" };
List<String> tem = new ArrayList<String>();
for (int i = 0; i < ips.length; i++)
if (ips[i].indexOf("*") > -1) {
//todo 直接用等于，不能正确获取类似192.168.**.*这种格式的ip段
tem = complete(ips[i]);
from[i] = null;
end[i] = null;
} else {
from[i] = ips[i];
end[i] = ips[i];
}
StringBuffer fromIP = new StringBuffer();
StringBuffer endIP = new StringBuffer();
for (int i = 0; i < 4; i++)
if (from[i] != null) {
fromIP.append(from[i]).append(".");
endIP.append(end[i]).append(".");
} else {
fromIP.append("[*].");
endIP.append("[*].");
}
fromIP.deleteCharAt(fromIP.length() - 1);
endIP.deleteCharAt(endIP.length() - 1);
for (String s : tem) {
String ip = fromIP.toString().replace("[*]",
s.split(";")[0])
+ "-"
+ endIP.toString().replace("[*]", s.split(";")[1]);
if (validate(ip)) {
ipList.add(ip);
}
}
} else {
if (validate(allow)) {
ipList.add(allow);
}
}
}
return ipList;
}
/**
* 对单个IP节点进行范围限定
*
* @param arg
* @return 返回限定后的IP范围，格式为List[10;19, 100;199]
*/
private static List<String> complete(String arg) {
List<String> com = new ArrayList<String>();
if (arg.length() == 1) {
com.add("0;255");
} else if (arg.length() == 2) {
String s1 = complete(arg, 1);
if (s1 != null)
com.add(s1);
String s2 = complete(arg, 2);
if (s2 != null)
com.add(s2);
} else {
String s1 = complete(arg, 1);
if (s1 != null)
com.add(s1);
}
return com;
}
private static String complete(String arg, int length) {
String from = "";
String end = "";
if (length == 1) {
from = arg.replace("*", "0");
end = arg.replace("*", "9");
} else {
from = arg.replace("*", "00");
end = arg.replace("*", "99");
}
if (Integer.valueOf(from) > 255)
return null;
if (Integer.valueOf(end) > 255)
end = "255";
return from + ";" + end;
}
/**
* 在添加至白名单时进行格式校验
*
* @param ip
* @return
*/
private static boolean validate(String ip) {
for (String s : ip.split("-"))
if (!pattern.matcher(s).matches()) {
return false;
}
return true;
}
/**
*
* checkLoginIP:(根据IP,及可用Ip列表来判断ip是否包含在白名单之中).
* @date 2017-4-17 下午03:01:03
* @param ip
* @param ipList
* @return
*/
private static boolean checkLoginIP(String ip, Set<String> ipList) {
if (ipList.isEmpty() || ipList.contains(ip))
return true;
else {
for (String allow : ipList) {
if (allow.indexOf("-") > -1) {
String[] from = allow.split("-")[0].split("\\.");
String[] end = allow.split("-")[1].split("\\.");
String[] tag = ip.split("\\.");
// 对IP从左到右进行逐段匹配
boolean check = true;
for (int i = 0; i < 4; i++) {
int s = Integer.valueOf(from[i]);
int t = Integer.valueOf(tag[i]);
int e = Integer.valueOf(end[i]);
if (!(s <= t && t <= e)) {
check = false;
break;
}
}
if (check) {
return true;
}
}
}
}
return false;
}
/**
*
* checkLoginIP:(根据IP地址，及IP白名单设置规则判断IP是否包含在白名单).
* @date 2017-4-17 下午03:01:37
* @param ip
* @param ipWhiteConfig
* @return
*/
public static boolean checkLoginIP(String ip,String ipWhiteConfig){
Set<String> ipList = getAvaliIpList(ipWhiteConfig);
return checkLoginIP(ip, ipList);
}
public static void main(String[] args) {
String ipWhilte = "192.168.1.1," + //设置单个IP的白名单
"192.168.*.2," + //设置ip通配符,对一个ip段进行匹配
"192.168.3.17-192.168.3.38"; //设置一个IP范围
boolean flag = checkLoginIP("192.168.2.2",ipWhilte);
boolean flag2 = checkLoginIP("192.168.1.2",ipWhilte);
boolean flag3 = checkLoginIP("192.168.3.16",ipWhilte);
boolean flag4 = checkLoginIP("192.168.3.17",ipWhilte);
System.out.println(flag); //true
System.out.println(flag2); //false
System.out.println(flag3); //false
System.out.println(flag4); //true
}
}
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