Don't send extra messages, will cause interoperability problems

with versions not built to receive these extra messages.
Likewise in reverse.

libraries/libldap/os-local.c

@@ -131,10 +131,6 @@ ldap_pvt_is_socket_ready(LDAP *ld, int s)
 }
 #undef TRACE
 
-#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(LOCAL_PEERCRED) && defined(HAVE_SENDMSG)
-#define DO_SENDMSG
-#endif
-
 static int
 ldap_pvt_connect(LDAP *ld, ber_socket_t s, struct sockaddr_un *sa, int async)
 {
@@ -159,25 +155,6 @@ ldap_pvt_connect(LDAP *ld, ber_socket_t s, struct sockaddr_un *sa, int async)
 		if ( ldap_pvt_ndelay_off(ld, s) == -1 ) {
 			return ( -1 );
 		}
-#ifdef DO_SENDMSG
-	/* Send a dummy message with access rights. Remote side will
-	 * obtain our uid/gid by fstat'ing this descriptor.
-	 */
-sendcred:	 {
-			int fds[2];
-			struct iovec iov = {(char *)fds, sizeof(int)};
-			struct msghdr msg = {0};
-			if (pipe(fds) == 0) {
-				msg.msg_iov = &iov;
-				msg.msg_iovlen = 1;
-				msg.msg_accrights = (char *)fds;
-				msg.msg_accrightslen = sizeof(int);
-				sendmsg( s, &msg, 0 );
-			    	close(fds[0]);
-				close(fds[1]);
-			}
-		}
-#endif
 		return ( 0 );
 	}
 

libraries/liblutil/getpeereid.c

@@ -18,11 +18,6 @@
 #include <sys/ucred.h>
 #endif
 
-#if !defined(SO_PEERCRED) && !defined(LOCAL_PEERCRED) && defined(HAVE_SENDMSG)
-#define DO_SENDMSG
-#include <sys/stat.h>
-#endif
-
 int getpeereid( int s, uid_t *euid, gid_t *egid )
 {
 #ifdef LDAP_PF_LOCAL
@@ -51,31 +46,6 @@ int getpeereid( int s, uid_t *euid, gid_t *egid )
 		*egid = peercred.cr_gid;
 		return 0;
 	}
-#elif defined( DO_SENDMSG )
-	int dummy, fd[2];
-	struct iovec iov = {(char *)&dummy, sizeof(dummy)};
-	struct msghdr msg = {0};
-	struct stat st;
-	msg.msg_iov = &iov;
-	msg.msg_iovlen = 1;
-	msg.msg_accrights = (char *)fd;
-	msg.msg_accrightslen = sizeof(fd);
-	if( recvmsg( s, &msg, 0) >= 0 && msg.msg_accrightslen == sizeof(int) )
-	{
-		/* We must receive a valid descriptor, it must be a pipe,
-		 * and it must only be accessible by its owner.
-		 */
-		dummy = fstat( fd[0], &st );
-		close(fd[0]);
-		if( dummy == 0 && S_ISFIFO(st.st_mode) &&
-			((st.st_mode & (S_IRWXG|S_IRWXO)) == 0))
-		{
-			*euid = st.st_uid;
-			*egid = st.st_gid;
-			return 0;
-		}
-	}
-#endif
 #endif
 
 	return -1;