nss_winbind: When returning NSS_UNAVAIL, squash errno to ENOENT

According to the GNU libc nss guide, we should always set
errno to ENOENT when returning NSS_UNAVAIL.

http://www.gnu.org/software/libtool/manual/libc/NSS-Modules-Interface.html#NSS-Modules-Interface

At least the MQ Series message queing service that runs
on WebSphere will fail if you return any other errno in this case.
(This used to be commit ee26664602445fa7798e2061f6bcbef0756d6528)

1 files changed, 18 insertions, 2 deletions

diff --git a/source3/nsswitch/wb_common.c b/source3/nsswitch/wb_common.c
index b113fc3336e..6e6d2bbbf84 100644
--- a/source3/nsswitch/wb_common.c
+++ b/source3/nsswitch/wb_common.c
@@ -176,11 +176,13 @@ static int winbind_named_pipe_sock(const char *dir)
 	/* Check permissions on unix socket directory */
 
 	if (lstat(dir, &st) == -1) {
+		errno = ENOENT;
 		return -1;
 	}
 
 	if (!S_ISDIR(st.st_mode) ||
 	    (st.st_uid != 0 && st.st_uid != geteuid())) {
+		errno = ENOENT;
 		return -1;
 	}
 
@@ -199,6 +201,7 @@ static int winbind_named_pipe_sock(const char *dir)
 	   the winbindd daemon is not running. */
 
 	if (lstat(path, &st) == -1) {
+		errno = ENOENT;
 		SAFE_FREE(path);
 		return -1;
 	}
@@ -208,6 +211,7 @@ static int winbind_named_pipe_sock(const char *dir)
 
 	if (!S_ISSOCK(st.st_mode) ||
 	    (st.st_uid != 0 && st.st_uid != geteuid())) {
+		errno = ENOENT;
 		return -1;
 	}
 
@@ -368,6 +372,7 @@ int winbind_write_sock(void *buffer, int count, int recursing, int need_priv)
  restart:
 	
 	if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
+		errno = ENOENT;
 		return -1;
 	}
 	
@@ -564,7 +569,11 @@ NSS_STATUS winbindd_send_request(int req_type, int need_priv,
 	
 	if (winbind_write_sock(request, sizeof(*request),
 			       request->wb_flags & WBFLAG_RECURSE,
-			       need_priv) == -1) {
+			       need_priv) == -1) 
+	{
+		/* Set ENOENT for consistency.  Required by some apps */
+		errno = ENOENT;
+		
 		return NSS_STATUS_UNAVAIL;
 	}
 
@@ -572,7 +581,11 @@ NSS_STATUS winbindd_send_request(int req_type, int need_priv,
 	    (winbind_write_sock(request->extra_data.data,
 	    			request->extra_len,
 				request->wb_flags & WBFLAG_RECURSE,
-				need_priv) == -1)) {
+				need_priv) == -1)) 
+	{
+		/* Set ENOENT for consistency.  Required by some apps */
+		errno = ENOENT;
+
 		return NSS_STATUS_UNAVAIL;
 	}
 	
@@ -596,6 +609,9 @@ NSS_STATUS winbindd_get_response(struct winbindd_response *response)
 
 	/* Wait for reply */
 	if (winbindd_read_reply(response) == -1) {
+		/* Set ENOENT for consistency.  Required by some apps */
+		errno = ENOENT;
+
 		return NSS_STATUS_UNAVAIL;
 	}