From f4afca81ada6416ad4b1899210d1845b2b33f5de Mon Sep 17 00:00:00 2001
From: Randall Winkhart <idgr@tutanota.com>
Date: Thu, 3 Apr 2025 23:19:49 -0400
Subject: [PATCH] Strip unneeded functionality

---
 peercred.go           | 27 +++++++++------------------
 peercred_darwin.go    | 14 --------------
 peercred_freebsd.go   | 14 --------------
 peercred_linux.go     | 14 --------------
 peercred_solaris.go   | 14 --------------
 peercred_unix_test.go |  4 ++--
 6 files changed, 11 insertions(+), 76 deletions(-)

diff --git a/peercred.go b/peercred.go
index 5f474e6..e3bd2d9 100644
--- a/peercred.go
+++ b/peercred.go
@@ -7,9 +7,7 @@
 package peercred
 
 import (
-	"errors"
 	"net"
-	"runtime"
 )
 
 // Creds are the peer credentials.
@@ -23,25 +21,18 @@ func (c *Creds) PID() (pid int, ok bool) {
 }
 
 // UserID returns the userid (or Windows SID) that owns the other side
-// of the connection, if known. (ok is false if not known)
+// of the connection.
 // The returned string is suitable to passing to os/user.LookupId.
-func (c *Creds) UserID() (uid string, ok bool) {
-	return c.uid, c.uid != ""
+func (c *Creds) UserID() (uid string) {
+	return c.uid
 }
 
-var osGet func(net.Conn) (*Creds, error)
-
-var (
-	ErrNotImplemented      = errors.New("not implemented on " + runtime.GOOS)
-	ErrUnsupportedConnType = errors.New("unsupported connection type")
-)
+func osGet(c net.Conn) (*Creds, error) {
+	return getUnix(c.(*net.UnixConn))
+}
 
 // Get returns the peer credentials for c.
-//
-// For unsupported system, the error is ErrNotImplemented.
-func Get(c net.Conn) (*Creds, error) {
-	if osGet == nil {
-		return nil, ErrNotImplemented
-	}
-	return osGet(c)
+func Get(c net.Conn) *Creds {
+	creds, _ := osGet(c)
+	return creds
 }
diff --git a/peercred_darwin.go b/peercred_darwin.go
index 4844c39..b9fb9cb 100644
--- a/peercred_darwin.go
+++ b/peercred_darwin.go
@@ -12,20 +12,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func init() {
-	osGet = getDarwin
-}
-
-func getDarwin(c net.Conn) (*Creds, error) {
-	switch c := c.(type) {
-	case *net.UnixConn:
-		return getUnix(c)
-	case *net.TCPConn:
-		// TODO: use /proc tcp info for localhost connections like Windows?
-	}
-	return nil, ErrUnsupportedConnType
-}
-
 func getUnix(c *net.UnixConn) (*Creds, error) {
 	raw, err := c.SyscallConn()
 	if err != nil {
diff --git a/peercred_freebsd.go b/peercred_freebsd.go
index 6606fbe..dd41c3b 100644
--- a/peercred_freebsd.go
+++ b/peercred_freebsd.go
@@ -12,20 +12,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func init() {
-	osGet = getFreeBSD
-}
-
-func getFreeBSD(c net.Conn) (*Creds, error) {
-	switch c := c.(type) {
-	case *net.UnixConn:
-		return getUnix(c)
-	case *net.TCPConn:
-		// TODO: use sysctl net.inet.tcp.pcblist for localhost connections like Windows?
-	}
-	return nil, ErrUnsupportedConnType
-}
-
 func getUnix(c *net.UnixConn) (*Creds, error) {
 	raw, err := c.SyscallConn()
 	if err != nil {
diff --git a/peercred_linux.go b/peercred_linux.go
index c1319ad..617012c 100644
--- a/peercred_linux.go
+++ b/peercred_linux.go
@@ -12,20 +12,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func init() {
-	osGet = getLinux
-}
-
-func getLinux(c net.Conn) (*Creds, error) {
-	switch c := c.(type) {
-	case *net.UnixConn:
-		return getUnix(c)
-	case *net.TCPConn:
-		// TODO: use /proc tcp info for localhost connections like Windows?
-	}
-	return nil, ErrUnsupportedConnType
-}
-
 func getUnix(c *net.UnixConn) (*Creds, error) {
 	raw, err := c.SyscallConn()
 	if err != nil {
diff --git a/peercred_solaris.go b/peercred_solaris.go
index aa84dda..2236970 100644
--- a/peercred_solaris.go
+++ b/peercred_solaris.go
@@ -12,20 +12,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-func init() {
-	osGet = getSolaris
-}
-
-func getSolaris(c net.Conn) (*Creds, error) {
-	switch c := c.(type) {
-	case *net.UnixConn:
-		return getUnix(c)
-	case *net.TCPConn:
-		// TODO: Need ideas
-	}
-	return nil, ErrUnsupportedConnType
-}
-
 func getUnix(c *net.UnixConn) (*Creds, error) {
 	raw, err := c.SyscallConn()
 	if err != nil {
diff --git a/peercred_unix_test.go b/peercred_unix_test.go
index c183c11..fe46073 100644
--- a/peercred_unix_test.go
+++ b/peercred_unix_test.go
@@ -46,12 +46,12 @@ func TestUnixSock(t *testing.T) {
 	}
 	defer c.Close()
 
-	creds, err := Get(c)
+	creds := Get(c)
 	if err != nil {
 		t.Fatalf("Get: %v", err)
 	}
 
-	uid, ok := creds.UserID()
+	uid := creds.UserID()
 	if !ok {
 		t.Errorf("no UID")
 	}