IP address range match

[kevinyide]

How do i check if a particular IP address, obtained as NSString say zz.zz.zz.zz lie between custom allowable range of zz.zz.zz.xx & zz.zz.zz.yy ??

[QuantumDoja]

I'm sure there is a better way, but you could split the strings on the "." and then compare the values in the resulting array...ie:

int[] given = split{"100.122.100.124"}

int[] ip1 = split{"100.122.100.122"}
int[] ip2 = split{"100.122.100.126"}

//check first 3 are equal, then check the last number?
if (given[3] >= ip1[3] && given[3] <= ip2[3]) {
 //in range
}

or something like that anyway.

[kevinyide]

i shall try that out, im sure there must be a better way too, but found none on the forums...
Thanks,
Kevin

[kevinyide]

OK for an ip xx.xx.xx.xx that i need to check for range between xx.xx.xx.yy & xx.xx.xx.zz i have

NSArray *checkIP = [[NSArray alloc]initWithArray:[myIpString componentsSeparatedByString:@"."]];

Likewise i have NSArrays for the startIP & endIP range.
How do i check if the first three numbers of checkIP xx.xx.xx.xx are same as that of startIP &/OR endIP before i proceed to check the last number in the ip?
I dont want to check it number by number using objectAtIndex though i could. I've read the documentation for NSIndexSet to try and use it like if [checkIP objectsAtIndexes:NSIndexSet] (for array indexes 1-3) bt i hvnt been able to use it... what am i missing? hw is the IndexSet to be used?
All im looking for is minimum lines of code to check the first 3 numbers of someIP are same as first three numbers of my IP range limits.

[kevinyide]

anyone having any idea how i could check a specified number of objects between two NSArray's being equal in value or not?

[SpaceAce]

Originally Posted by kevinyide

anyone having any idea how i could check a specified number of objects between two NSArray's being equal in value or not?

Sure, you are thinking way too complicated here.

All you need to do is to calculate the integer representation for the 3 IPs and then do a simple greater / equal / smaller comparison!

So: Include <arpa/inet.h>, use either function inet_aton() (which is deprecated but still works fine) or inet_pton() to convert the first, last and check-IP x.x.x.x to integers and then compare check_ip < start_ip || check_ip > end_ip

Hope this helps.