27 lines
842 B
Go
27 lines
842 B
Go
package dns
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import (
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"regexp"
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)
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// IPLocalhost is a regex pattern for IPv4 or IPv6 loopback range.
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const IPLocalhost = `((127\.([0-9]{1,3}\.){2}[0-9]{1,3})|(::1)$)`
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// IPv4Localhost is a regex pattern for IPv4 localhost address range.
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const IPv4Localhost = `(127\.([0-9]{1,3}\.){2}[0-9]{1,3})`
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var localhostIPRegexp = regexp.MustCompile(IPLocalhost)
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var localhostIPv4Regexp = regexp.MustCompile(IPv4Localhost)
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// IsLocalhost returns true if ip matches the localhost IP regular expression.
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// Used for determining if nameserver settings are being passed which are
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// localhost addresses
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func IsLocalhost(ip string) bool {
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return localhostIPRegexp.MatchString(ip)
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}
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// IsIPv4Localhost returns true if ip matches the IPv4 localhost regular expression.
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func IsIPv4Localhost(ip string) bool {
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return localhostIPv4Regexp.MatchString(ip)
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}
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