/**
* Function name: validatemask
* Function: verify the validity of the subnet mask.
* Function Author: 236f (fuwei236 # gmail.com)
* Input parameter: maskstr: The subnet mask in dotted decimal format (for example, 255.255.255.192)
* Main function:
* Call the function: _ checkiput_fomartip (IP)
* Return value: true: maskstr is a valid subnet mask.
* False: maskstr is an invalid subnet mask.
**/
Function validatemask (maskstr)
{
/* Validity verification */
VaR ippattern =/^/d {1, 3}/./d {1, 3}/./d {1, 3}/./d {1, 3} $/
If (! Ippattern. Test (maskstr) return false;
/* Check the Domain value */
VaR iparray = maskstr. Split (".");
VaR IP1 = parseint (iparray [0]);
VaR ip2 = parseint (iparray [1]);
VaR IP3 = parseint (iparray [2]);
VaR ip4 = parseint (iparray [3]);
If (IP1 <0 | IP1> 255/* The value range of each domain is 0-255 */
| Ip2 <0 | ip2> 255.
| IP3 <0 | IP3> 255
| Ip4 <0 | ip4> 255)
{
Return false;
}
/* Check whether the binary value is valid */
// Concatenate a binary string
VaR ip_binary = _ checkiput_fomartip (IP1) + _ checkiput_fomartip (ip2) + _ checkiput_fomartip (IP3) + _ checkiput_fomartip (ip4 );
If (-1! = Ip_binary.indexof ("01") return false;
Return true;
}
/**
* Function name: _ checkiput_fomartip
* Function: returns the 8-bit binary value corresponding to the input parameter.
* Function Author: 236f (fuwei236 # gmail.com)
* Input parameter: IP Address: the point-to-decimal value (0 ~ 255), int type value,
* Main function: validatemask
* Call a function: None
* Return value: the binary value corresponding to the IP address. For example, if 255 is input, 11111111 is returned. If 1 is input, 00000001 is returned)
**/
Function _ checkiput_fomartip (IP)
{
Return (IP + 256). tostring (2). substring (1); // format the output (add zero)
}
=============================== Separator ==========================
Test page test.htm
=============================== Separator ==========================
<HTML>
<Head>
<Title> </title>
<SCRIPT src = "validatemask. js"> </SCRIPT>
<SCRIPT>
Function Test (maskstr)
{
Alert ("IP Address:" + maskstr + "Verification Result:" + validatemask (maskstr ));
}
</SCRIPT>
</Head>
<Body>
<Center>
<H1> Subnet Mask Verification
</H1>
<Input type = "text" name = "Mask" id = "Mask" value = "">
<Input type = "button" name = "mytest" id = "mytest" value = "click to verify the value in the input box" onclick = "test (mask. Value)">
</Center>
</Body>
</Html>
====================
// Verify the IP address Validity
Function validateip (IP ){
VaR result = false;
If (! (/^ (/D {1, 3}) (/./d {1, 3}) {3} $/. Test (IP ))){
Return false;
}
VaR respacecheck =/^ (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1-9] {1} [0-9] {1} | [1-9]) /. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [1-9] | 0) /. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [1-9] | 0) /. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [0-9]) $ /;
VaR validip = IP. Match (respacecheck );
If (validip! = NULL ){
Result = true;
}
Return result;
}
// Verify the validity of the subnet mask
Function validatenetmast (netmask ){
VaR result = false;
If (! (/^ (/D {1, 3}) (/./d {1, 3}) {3} $/. Test (netmask ))){
Return true;
}
VaR respacecheck =/^ (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1-9] {1} [0-9] {1} | [1-9]) /. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [1-9] | 0) /. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [1-9] | 0) /. (25 [0-5] | 2 [0-4] [0-9] | [0-1] {1} [0-9] {2} | [1- 9] {1} [0-9] {1} | [0-9]) $ /;
VaR validip = netmask. Match (respacecheck );
If (validip! = NULL ){
VaR mask_binary = conversionbinary (netmask );
If (-1! = Mask_binary.indexof ("01 ")){
Result = true;
}
} Else {
Result = true;
}
Return result;
}
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