mirror of
https://github.com/netbirdio/netbird.git
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113 lines
2.9 KiB
Go
113 lines
2.9 KiB
Go
//go:build linux && !android
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package loopback
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import (
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"net/netip"
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"testing"
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)
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func TestAllocatorHandsOutDistinctAddresses(t *testing.T) {
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var a allocator
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taken := make(map[netip.Addr]bool)
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for i := 0; i < 1000; i++ {
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addr, err := a.next(func(candidate netip.Addr) bool { return taken[candidate] })
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if err != nil {
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t.Fatalf("allocate %d: %v", i, err)
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}
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if taken[addr] {
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t.Fatalf("address %s handed out twice", addr)
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}
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if !inRange(addr) {
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t.Fatalf("address %s outside %s", addr, addrRangePrefix)
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}
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taken[addr] = true
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}
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}
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func TestAllocatorSkipsNetworkAndBroadcastHosts(t *testing.T) {
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var a allocator
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taken := make(map[netip.Addr]bool)
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// enough allocations to walk past a .255/.0 boundary
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for i := 0; i < 600; i++ {
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addr, err := a.next(func(candidate netip.Addr) bool { return taken[candidate] })
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if err != nil {
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t.Fatalf("allocate %d: %v", i, err)
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}
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last := addr.As4()[3]
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if last == 0 || last == 255 {
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t.Fatalf("address %s ends in .%d", addr, last)
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}
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taken[addr] = true
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}
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}
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func TestAllocatorReusesReleasedAddresses(t *testing.T) {
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var a allocator
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taken := make(map[netip.Addr]bool)
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inUse := func(candidate netip.Addr) bool { return taken[candidate] }
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alloc := func() netip.Addr {
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t.Helper()
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addr, err := a.next(inUse)
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if err != nil {
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t.Fatalf("allocate: %v", err)
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}
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taken[addr] = true
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return addr
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}
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first := alloc()
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second := alloc()
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delete(taken, first)
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// The cursor only moves forward, so a released address comes back after a
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// wrap. Park the cursor near the end of the range instead of allocating
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// 2^23 addresses: the next call takes the last usable address, and the one
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// after that wraps past the skipped .255 and .0 hosts to the released one.
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a.cursor = addrRangeSize - 3
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last := alloc()
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if want := netip.MustParseAddr("127.255.255.254"); last != want {
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t.Fatalf("expected the last usable address %s before the wrap, got %s", want, last)
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}
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if reused := alloc(); reused != first {
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t.Fatalf("expected the released address %s after the wrap, got %s", first, reused)
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}
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// second is still held, so the allocator must step over it.
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if next := alloc(); next == second {
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t.Fatalf("allocator handed out %s while it was still in use", second)
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}
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}
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func TestInRange(t *testing.T) {
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tests := []struct {
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addr string
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want bool
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}{
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{"127.128.0.1", true},
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{"127.255.255.254", true},
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{"127.127.255.255", false}, // below the range, where 127.0.0.53 and friends live
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{"127.0.0.1", false},
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{"127.0.0.53", false},
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{"127.0.1.1", false},
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{"128.0.0.1", false},
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{"10.0.0.1", false},
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}
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for _, tc := range tests {
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addr := netip.MustParseAddr(tc.addr)
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if got := inRange(addr); got != tc.want {
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t.Errorf("inRange(%s) = %v, want %v", tc.addr, got, tc.want)
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}
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}
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}
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func TestInRangeIgnoresIPv6(t *testing.T) {
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if inRange(netip.MustParseAddr("::1")) {
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t.Error("inRange(::1) = true, want false")
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}
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}
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