f91de2ecd6
I develop this diff while working on https://github.com/ooni/probe/issues/1803#issuecomment-957323297. While there, make sure we don't have duplicate bogon code and always use the code inside netxlite.
57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package netxlite
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//
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// Bogon
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//
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// This file helps us to decide if an IPAddr is a bogon.
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//
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// TODO(bassosimone): code in engine/netx should use this file.
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import (
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"net"
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"github.com/ooni/probe-cli/v3/internal/runtimex"
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)
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// IsBogon returns whether if an IP address is bogon. Passing to this
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// function a non-IP address causes it to return true.
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func IsBogon(address string) bool {
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ip := net.ParseIP(address)
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return ip == nil || isPrivate(ip)
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}
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var privateIPBlocks []*net.IPNet
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func init() {
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for _, cidr := range []string{
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"0.0.0.0/8", // "This" network (however, Linux...)
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"10.0.0.0/8", // RFC1918
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"100.64.0.0/10", // Carrier grade NAT
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"127.0.0.0/8", // IPv4 loopback
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"169.254.0.0/16", // RFC3927 link-local
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"172.16.0.0/12", // RFC1918
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"192.168.0.0/16", // RFC1918
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"224.0.0.0/4", // Multicast
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"::1/128", // IPv6 loopback
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"fe80::/10", // IPv6 link-local
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"fc00::/7", // IPv6 unique local addr
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} {
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_, block, err := net.ParseCIDR(cidr)
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runtimex.PanicOnError(err, "net.ParseCIDR failed")
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privateIPBlocks = append(privateIPBlocks, block)
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}
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}
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func isPrivate(ip net.IP) bool {
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if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
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return true
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}
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for _, block := range privateIPBlocks {
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if block.Contains(ip) {
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return true
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}
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}
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return false
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}
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