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all: update to Go 1.20, use strings.CutPrefix/Suffix instead of our fork

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Updates #7123
Updates #5309

Change-Id: I90bcd87a2fb85a91834a0dd4be6e03db08438672
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2023-02-01 13:43:06 -08:00
committed by Brad Fitzpatrick
parent 623176ebc9
commit b1248442c3
34 changed files with 73 additions and 147 deletions
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3
net/dns/resolver/tsdns.go
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@ -33,7 +33,6 @@ import (
"tailscale.com/util/clientmetric"
"tailscale.com/util/cloudenv"
"tailscale.com/util/dnsname"
"tailscale.com/util/strs"
"tailscale.com/wgengine/monitor"
)
@ -1215,7 +1214,7 @@ func (r *Resolver) respond(query []byte) ([]byte, error) {
// unARPA maps from "4.4.8.8.in-addr.arpa." to "8.8.4.4", etc.
func unARPA(a string) (ipStr string, ok bool) {
const suf4 = ".in-addr.arpa."
if s, ok := strs.CutSuffix(a, suf4); ok {
if s, ok := strings.CutSuffix(a, suf4); ok {
// Parse and reverse octets.
ip, err := netip.ParseAddr(s)
if err != nil || !ip.Is4() {