0002-Sort-out-getpeereid-and-struct-passwd-handling-on-Wi.patch

From 8bcbe1ab6786e746ac050f464c324c6e9aacdaa2 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter@eisentraut.org>
Date: Wed, 7 Aug 2019 15:44:19 +0200
Subject: [PATCH 2/5] Sort out getpeereid() and struct passwd handling on
 Windows

The getpeereid() uses are protected by HAVE_UNIX_SOCKETS, so they
didn't ever care about Windows support.  But that is required now, and
so we need to provide a getpeereid() stub for Windows.  We can just
let configure do its usual thing of picking up the replacefrom from
libpgport instead of the custom overrides that it was doing before.

But then Windows doesn't have struct passwd, so all this code around
getpeereid() won't work anyway.  This patch just sprinkles some #ifdef
WIN32 around to make it work.  Perhaps a configure test for struct
passwd would be a better way to protect this code.
---
 configure                         | 34 +++++++++++++------------------
 configure.in                      |  9 +++-----
 src/backend/libpq/auth.c          |  6 ++++++
 src/include/port.h                |  2 +-
 src/interfaces/libpq/fe-connect.c |  4 ++++
 5 files changed, 28 insertions(+), 27 deletions(-)

diff --git a/configure b/configure
index 6e87537be3..8c48c6ce81 100755
--- a/configure
+++ b/configure
@@ -15837,6 +15837,19 @@ esac
 
 fi
 
+ac_fn_c_check_func "$LINENO" "getpeereid" "ac_cv_func_getpeereid"
+if test "x$ac_cv_func_getpeereid" = xyes; then :
+  $as_echo "#define HAVE_GETPEEREID 1" >>confdefs.h
+
+else
+  case " $LIBOBJS " in
+  *" getpeereid.$ac_objext "* ) ;;
+  *) LIBOBJS="$LIBOBJS getpeereid.$ac_objext"
+ ;;
+esac
+
+fi
+
 ac_fn_c_check_func "$LINENO" "getrusage" "ac_cv_func_getrusage"
 if test "x$ac_cv_func_getrusage" = xyes; then :
   $as_echo "#define HAVE_GETRUSAGE 1" >>confdefs.h
@@ -16017,17 +16030,11 @@ esac
 case $host_os in
 
         # Windows uses a specialised env handler
-        # and doesn't need a replacement getpeereid because it doesn't use
-        # Unix sockets.
         mingw*)
 
 $as_echo "#define HAVE_UNSETENV 1" >>confdefs.h
 
-
-$as_echo "#define HAVE_GETPEEREID 1" >>confdefs.h
-
-                ac_cv_func_unsetenv=yes
-                ac_cv_func_getpeereid=yes;;
+                ac_cv_func_unsetenv=yes;;
         *)
                 ac_fn_c_check_func "$LINENO" "unsetenv" "ac_cv_func_unsetenv"
 if test "x$ac_cv_func_unsetenv" = xyes; then :
@@ -16040,19 +16047,6 @@ else
  ;;
 esac
 
-fi
-
-ac_fn_c_check_func "$LINENO" "getpeereid" "ac_cv_func_getpeereid"
-if test "x$ac_cv_func_getpeereid" = xyes; then :
-  $as_echo "#define HAVE_GETPEEREID 1" >>confdefs.h
-
-else
-  case " $LIBOBJS " in
-  *" getpeereid.$ac_objext "* ) ;;
-  *) LIBOBJS="$LIBOBJS getpeereid.$ac_objext"
- ;;
-esac
-
 fi
 
 
diff --git a/configure.in b/configure.in
index dde3eec89f..03fd9b6a61 100644
--- a/configure.in
+++ b/configure.in
@@ -1696,6 +1696,7 @@ AC_REPLACE_FUNCS(m4_normalize([
 	dlopen
 	fls
 	getopt
+	getpeereid
 	getrusage
 	inet_aton
 	mkdtemp
@@ -1726,15 +1727,11 @@ esac
 case $host_os in
 
         # Windows uses a specialised env handler
-        # and doesn't need a replacement getpeereid because it doesn't use
-        # Unix sockets.
         mingw*)
                 AC_DEFINE(HAVE_UNSETENV, 1, [Define to 1 because replacement version used.])
-                AC_DEFINE(HAVE_GETPEEREID, 1, [Define to 1 because function not required.])
-                ac_cv_func_unsetenv=yes
-                ac_cv_func_getpeereid=yes;;
+                ac_cv_func_unsetenv=yes;;
         *)
-                AC_REPLACE_FUNCS([unsetenv getpeereid])
+                AC_REPLACE_FUNCS([unsetenv])
 		;;
 esac
 
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 5fb1f1b7d7..8f49b457e4 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -1999,7 +1999,11 @@ auth_peer(hbaPort *port)
 	}
 
 	errno = 0;					/* clear errno before call */
+#ifndef WIN32
 	pw = getpwuid(uid);
+#else
+	pw = NULL;
+#endif
 	if (!pw)
 	{
 		int			save_errno = errno;
@@ -2011,7 +2015,9 @@ auth_peer(hbaPort *port)
 		return STATUS_ERROR;
 	}
 
+#ifndef WIN32
 	strlcpy(ident_user, pw->pw_name, IDENT_USERNAME_MAX + 1);
+#endif
 
 	return check_usermap(port->hba->usermap, port->user_name, ident_user, false);
 }
diff --git a/src/include/port.h b/src/include/port.h
index b5c03d912b..a3e7b5c03c 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -357,7 +357,7 @@ extern int	fls(int mask);
 #define ftello(a)		ftell(a)
 #endif
 
-#if !defined(HAVE_GETPEEREID) && !defined(WIN32)
+#ifndef HAVE_GETPEEREID
 extern int	getpeereid(int sock, uid_t *uid, gid_t *gid);
 #endif
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index d262b57021..b4fa7a259f 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -2685,8 +2685,10 @@ PQconnectPoll(PGconn *conn)
 					IS_AF_UNIX(conn->raddr.addr.ss_family))
 				{
 					char		pwdbuf[BUFSIZ];
+#ifndef WIN32
 					struct passwd pass_buf;
 					struct passwd *pass;
+#endif
 					int			passerr;
 					uid_t		uid;
 					gid_t		gid;
@@ -2708,6 +2710,7 @@ PQconnectPoll(PGconn *conn)
 						goto error_return;
 					}
 
+#ifndef WIN32
 					passerr = pqGetpwuid(uid, &pass_buf, pwdbuf, sizeof(pwdbuf), &pass);
 					if (pass == NULL)
 					{
@@ -2730,6 +2733,7 @@ PQconnectPoll(PGconn *conn)
 										  conn->requirepeer, pass->pw_name);
 						goto error_return;
 					}
+#endif							/* WIN32 */
 				}
 #endif							/* HAVE_UNIX_SOCKETS */
 
-- 
2.22.0