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.
(cherry picked from commit ee26664602445fa7798e2061f6bcbef0756d6528)

diff --git a/source/nsswitch/wb_common.c b/source/nsswitch/wb_common.c
index b113fc3336ee537b2d03fe46911b7901292fb613..6e6d2bbbf84d4f90fc18819dff9708c27ce2de00 100644 (file)
--- a/source/nsswitch/wb_common.c
+++ b/source/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;
        }