85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package net_test
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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"go.probo.inc/probo/pkg/net"
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)
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func TestIsLoopback(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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host string
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want bool
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}{
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// Localhost by name.
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{"localhost", "localhost", true},
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// IPv4 loopback addresses (127.0.0.0/8).
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{"ipv4 canonical loopback", "127.0.0.1", true},
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{"ipv4 loopback high octet", "127.255.255.255", true},
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{"ipv4 loopback alternate", "127.0.0.2", true},
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{"ipv4 loopback 127.1.2.3", "127.1.2.3", true},
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// IPv6 loopback.
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{"ipv6 loopback", "::1", true},
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// IPv4-mapped IPv6 loopback.
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{"ipv4-mapped ipv6 loopback", "::ffff:127.0.0.1", true},
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{"ipv4-mapped ipv6 loopback alternate", "::ffff:127.0.0.2", true},
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// Non-loopback addresses.
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{"ipv4 private 10.x", "10.0.0.1", false},
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{"ipv4 private 192.168.x", "192.168.1.1", false},
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{"ipv4 private 172.16.x", "172.16.0.1", false},
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{"ipv4 public", "8.8.8.8", false},
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{"ipv4 all interfaces", "0.0.0.0", false},
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{"ipv6 all interfaces", "::", false},
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{"ipv6 link-local", "fe80::1", false},
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{"ipv6 public", "2001:db8::1", false},
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{"ipv4-mapped ipv6 non-loopback", "::ffff:192.168.1.1", false},
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// Hostnames that are not localhost.
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{"example.com", "example.com", false},
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{"localhost.localdomain", "localhost.localdomain", false},
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{"myhost", "myhost", false},
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// Edge cases.
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{"empty string", "", false},
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{"whitespace", " ", false},
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{"localhost with trailing dot", "localhost.", false},
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{"uppercase LOCALHOST", "LOCALHOST", false},
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{"mixed case Localhost", "Localhost", false},
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{"128.0.0.1 not loopback", "128.0.0.1", false},
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{"126.255.255.255 not loopback", "126.255.255.255", false},
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}
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for _, tt := range tests {
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t.Run(
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tt.name,
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func(t *testing.T) {
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t.Parallel()
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assert.Equal(t, tt.want, net.IsLoopback(tt.host))
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},
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)
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}
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}
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