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portlist: add Poller.IncludeLocalhost option

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This PR parameterizes receiving loopback updates from the portlist package.
Callers can now include services bound to localhost if they want.
Note that this option is off by default still.

Fixes #8171

Signed-off-by: Marwan Sulaiman <marwan@tailscale.com>
This commit is contained in:
Marwan Sulaiman
2023-05-24 12:52:45 -04:00
committed by Marwan Sulaiman
parent 3d180a16c3
commit e32e5c0d0c
9 changed files with 88 additions and 64 deletions
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6
portlist/netstat.go
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@@ -67,7 +67,7 @@ type nothing struct{}
// Unfortunately, options to filter by proto or state are non-portable,
// so we'll filter for ourselves.
// Nowadays, though, we only use it for macOS as of 2022-11-04.
func appendParsePortsNetstat(base []Port, br *bufio.Reader) ([]Port, error) {
func appendParsePortsNetstat(base []Port, br *bufio.Reader, includeLocalhost bool) ([]Port, error) {
ret := base
var fieldBuf [10]mem.RO
for {
@@ -99,7 +99,7 @@ func appendParsePortsNetstat(base []Port, br *bufio.Reader) ([]Port, error) {
// not interested in non-listener sockets
continue
}
if isLoopbackAddr(laddr) {
if !includeLocalhost && isLoopbackAddr(laddr) {
// not interested in loopback-bound listeners
continue
}
@@ -110,7 +110,7 @@ func appendParsePortsNetstat(base []Port, br *bufio.Reader) ([]Port, error) {
proto = "udp"
laddr = cols[len(cols)-2]
raddr = cols[len(cols)-1]
if isLoopbackAddr(laddr) {
if !includeLocalhost && isLoopbackAddr(laddr) {
// not interested in loopback-bound listeners
continue
}