TESTS: Add a module to call nss_sss's getgr* from tests

Implements a python module that allows to load the nss_sss module and
call functions that act like getgr*

Reviewed-by: Pavel Březina <pbrezina@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

2 files changed, 89 insertions, 0 deletions

diff --git a/src/tests/intg/Makefile.am b/src/tests/intg/Makefile.am
index 6cd23967f..03245b35d 100644
--- a/src/tests/intg/Makefile.am
+++ b/src/tests/intg/Makefile.am
@@ -6,6 +6,7 @@ dist_noinst_DATA = \
     sssd_ldb.py \
     sssd_netgroup.py \
     sssd_passwd.py \
+    sssd_group.py \
     ds.py \
     ds_openldap.py \
     ent.py \
diff --git a/src/tests/intg/sssd_group.py b/src/tests/intg/sssd_group.py
new file mode 100644
index 000000000..a9cfb32d5
--- /dev/null
+++ b/src/tests/intg/sssd_group.py
@@ -0,0 +1,88 @@
+#
+# Module for simulation of utility "getent group -s sss" from coreutils
+#
+# Copyright (c) 2016 Red Hat, Inc.
+#
+# This is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 only
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+from ctypes import (c_int, c_char_p, c_ulong, POINTER, Structure,
+                    create_string_buffer)
+from sssd_nss import NssReturnCode, SssdNssError, nss_sss_ctypes_loader
+
+GROUP_BUFLEN = 1024
+
+
+class Group(Structure):
+    _fields_ = [("gr_name", c_char_p),
+                ("gr_passwd", c_char_p),
+                ("gr_gid", c_int),
+                ("gr_mem", POINTER(c_char_p))]
+
+
+def getgrnam_r(name, result_p, buffer_p, buflen):
+    """
+    ctypes wrapper for:
+        enum nss_status _nss_sss_getgrnam_r(const char *name,
+                                            struct group *result,
+                                            char *buffer,
+                                            size_t buflen,
+                                            int *errnop)
+    """
+    func = nss_sss_ctypes_loader("_nss_sss_getgrnam_r")
+    func.restype = c_int
+    func.argtypes = [c_char_p, POINTER(Group),
+                     c_char_p, c_ulong, POINTER(c_int)]
+
+    errno = POINTER(c_int)(c_int(0))
+
+    res = func(c_char_p(name), result_p, buffer_p, buflen, errno)
+
+    return (int(res), int(errno[0]), result_p)
+
+
+def set_group_dict(res, result_p):
+    if res != NssReturnCode.SUCCESS:
+        return dict()
+
+    group_dict = dict()
+    group_dict['name'] = result_p[0].gr_name
+    group_dict['gid'] = result_p[0].gr_gid
+    group_dict['mem'] = list()
+
+    i = 0
+    while result_p[0].gr_mem[i] != None:
+        group_dict['mem'].append(result_p[0].gr_mem[i])
+        i = i+1
+
+    return group_dict
+
+
+def call_sssd_getgrnam(name):
+    """
+    A Python wrapper to retrieve a group. Returns:
+        (res, group_dict)
+    if res is NssReturnCode.SUCCESS, then group_dict contains the keys
+    corresponding to the C passwd structure fields. Otherwise, the dictionary
+    is empty and errno indicates the error code
+    """
+    result = Group()
+    result_p = POINTER(Group)(result)
+    buff = create_string_buffer(GROUP_BUFLEN)
+
+    res, errno, result_p = getgrnam_r(name, result_p, buff, GROUP_BUFLEN)
+    if errno != 0:
+        raise SssdNssError(errno, "getgrnam_r")
+
+    group_dict = set_group_dict(res, result_p)
+    return res, group_dict