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wgengine/magicsock: allow a CSV list for pretendpoint

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Load Balancers often have more than one ingress IP, so allowing us to
add multiple means we can offer multiple options.

Updates #12578

Change-Id: I4aa49a698d457627d2f7011796d665c67d4c7952
Signed-off-by: Lee Briggs <lee@leebriggs.co.uk>
This commit is contained in:
Lee Briggs
2024-07-09 18:47:46 -07:00
committed by Brad Fitzpatrick
parent c6af5bbfe8
commit b546a6e758
3 changed files with 23 additions and 13 deletions
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28
wgengine/magicsock/debugknobs.go
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@@ -8,6 +8,7 @@ package magicsock
import (
"log"
"net/netip"
"strings"
"sync"
"tailscale.com/envknob"
@@ -73,17 +74,24 @@ var (
// startup.
func inTest() bool { return envknob.Bool("IN_TS_TEST") }
// pretendpoint returns TS_DEBUG_PRETENDPOINT as an AddrPort, if set.
// pretendpoints returns TS_DEBUG_PRETENDPOINT as []AddrPort, if set.
// See https://github.com/tailscale/tailscale/issues/12578 and
// https://github.com/tailscale/tailscale/pull/12735.
var pretendpoint = sync.OnceValue(func() (ap netip.AddrPort) {
s := envknob.String("TS_DEBUG_PRETENDPOINT")
if s == "" {
return
//
// It can be between 0 and 3 comma-separated AddrPorts.
var pretendpoints = sync.OnceValue(func() (ret []netip.AddrPort) {
all := envknob.String("TS_DEBUG_PRETENDPOINT")
const max = 3
remain := all
for remain != "" && len(ret) < max {
var s string
s, remain, _ = strings.Cut(remain, ",")
ap, err := netip.ParseAddrPort(s)
if err != nil {
log.Printf("ignoring invalid AddrPort %q in TS_DEBUG_PRETENDPOINT %q: %v", s, all, err)
continue
}
ret = append(ret, ap)
}
ap, err := netip.ParseAddrPort(s)
if err != nil {
log.Printf("ignoring invalid TS_DEBUG_PRETENDPOINT %q: %v", s, err)
}
return ap
return
})