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portlist: ignore ports bound to localhost

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Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2020-03-17 20:19:39 -07:00
committed by Brad Fitzpatrick
parent c706731dc7
commit f8d67bb591
5 changed files with 63 additions and 33 deletions
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16
portlist/netstat.go
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@@ -75,6 +75,10 @@ func parsePortsNetstat(output string) List {
// not interested in non-listener sockets
continue
}
if strings.HasPrefix(laddr, "127.0.0.1:") || strings.HasPrefix(laddr, "127.0.0.1.") {
// not interested in loopback-bound listeners
continue
}
} else if strings.HasPrefix(protos, "udp") {
if len(cols) < 3 {
continue
@@ -82,6 +86,10 @@ func parsePortsNetstat(output string) List {
proto = "udp"
laddr = cols[len(cols)-2]
raddr = cols[len(cols)-1]
if strings.HasPrefix(laddr, "127.0.0.1:") || strings.HasPrefix(laddr, "127.0.0.1.") {
// not interested in loopback-bound listeners
continue
}
} else if protos[0] == '[' && len(trimline) > 2 {
// Windows: with netstat -nab, appends a line like:
// [description]
@@ -134,16 +142,12 @@ func parsePortsNetstat(output string) List {
//lint:ignore U1000 function is only used on !linux, but we want the
// unit test to run on linux, so we don't build-tag it away.
func listPortsNetstat(args string) (List, error) {
func listPortsNetstat(arg string) (List, error) {
exe, err := exec.LookPath("netstat")
if err != nil {
return nil, fmt.Errorf("netstat: lookup: %v", err)
}
c := exec.Cmd{
Path: exe,
Args: []string{exe, args},
}
output, err := c.Output()
output, err := exec.Command(exe, arg).Output()
if err != nil {
xe, ok := err.(*exec.ExitError)
stderr := ""