Use getpeereid(3) where available else use *_PEERCRED replacment function

configure.in

@@ -834,6 +834,7 @@ AC_CHECK_HEADERS(	\
 	sys/syslog.h	\
 	sys/time.h		\
 	sys/types.h		\
+	sys/ucred.h		\
 	syslog.h		\
 	termios.h		\
 	unistd.h		\
@@ -2478,11 +2479,14 @@ AC_CHECK_FUNCS(		\
 )
 
 dnl We actually may need to replace more than this.
-AC_REPLACE_FUNCS(getopt)
+AC_REPLACE_FUNCS(getopt getpeereid)
 
 if test "$ac_cv_func_getopt" != yes; then
 	LIBSRCS="$LIBSRCS getopt.c"
 fi
+if test "$ac_cv_func_getpeereid" != yes; then
+	LIBSRCS="$LIBSRCS getpeereid.c"
+fi
 if test "$ac_cv_func_snprintf" != yes -o "$ac_cv_func_vsnprintf" != yes; then
 	if test "$ac_cv_func_snprintf" != yes; then
 		AC_DEFINE(snprintf, ber_pvt_snprintf, [define to snprintf routine])

include/ac/assert.h

@@ -32,7 +32,7 @@
  * create a replacement and hope it works
  */
 
-LIBLBER_F (void) ber_pvt_assert LDAP_P(( const char *file, int line,
+LBER_F (void) ber_pvt_assert LDAP_P(( const char *file, int line,
 					 const char *test ));
 
 /* Can't use LDAP_STRING(test), that'd expand to "test" */

include/ac/socket.h

@@ -197,8 +197,12 @@ LDAP_F (int) ldap_pvt_inet_aton LDAP_P(( const char *, struct in_addr * ));
 #		define AC_GAI_STRERROR(x)	(gai_strerror((x)))
 #	else
 #		define AC_GAI_STRERROR(x)	(ldap_pvt_gai_strerror((x)))
-		char * ldap_pvt_gai_strerror( int );
+		LDAP_F (char *) ldap_pvt_gai_strerror( int );
 #	endif
 #endif
 
+#ifndef HAVE_GETPEEREID
+LDAP_LUTIL_F( int ) getpeereid( int s, uid_t *, gid_t * );
+#endif
+
 #endif /* _AC_SOCKET_H_ */

include/portable.h.in

@@ -164,6 +164,9 @@
 /* Define if you have the getpassphrase function.  */
 #undef HAVE_GETPASSPHRASE
 
+/* Define if you have the getpeereid function.  */
+#undef HAVE_GETPEEREID
+
 /* Define if you have the getpwnam function.  */
 #undef HAVE_GETPWNAM
 
@@ -542,6 +545,9 @@
 /* Define if you have the <sys/types.h> header file.  */
 #undef HAVE_SYS_TYPES_H
 
+/* Define if you have the <sys/ucred.h> header file.  */
+#undef HAVE_SYS_UCRED_H
+
 /* Define if you have the <sys/un.h> header file.  */
 #undef HAVE_SYS_UN_H
 

libraries/liblutil/getpeereid.c

+/* getpeereid.c */
+/* $OpenLDAP$ */
+/*
+ * Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
+
+#include "portable.h"
+
+#ifndef HAVE_GETPEEREID
+
+#include <sys/types.h>
+#include <ac/unistd.h>
+
+#include <ac/socket.h>
+
+#if HAVE_SYS_UCRED_H
+#include <sys/ucred.h>
+#endif
+
+int getpeereid( int s, uid_t *euid, gid_t *egid )
+{
+#ifdef LDAP_PF_LOCAL
+#if defined( SO_PEERCRED )
+	struct ucred peercred;
+	size_t peercredlen = sizeof peercred;
+
+	if(( getsockopt( s, SOL_SOCKET, SO_PEERCRED,
+		(void *)&peercred, &peercredlen ) == 0 )
+		&& ( peercredlen == sizeof peercred ))
+	{
+		*euid = peercred.uid;
+		*egid = peercred.gid;
+		return 0;
+	}
+
+#elif defined( LOCAL_PEERCRED )
+	struct xucred peercred;
+	socklen_t peercredlen = sizeof peercred;
+
+	if(( getsockopt( s, LOCAL_PEERCRED, 1,
+		(void *)&peercred, &peercredlen ) == 0 )
+		&& ( peercred.cr_version == XUCRED_VERSION ))
+	{
+		*euid = peercred.cr_uid;
+		*egid = peercred.cr_gid;
+		return 0;
+	}
+#endif
+#endif
+
+	return -1;
+}
+
+#endif