diff options
author | Andrew Bartlett <abartlet@samba.org> | 2015-09-22 12:11:04 +1200 |
---|---|---|
committer | Andrew Bartlett <abartlet@samba.org> | 2015-10-26 05:11:21 +0100 |
commit | 87cd68c1dc0427521061f8febbcc18d73e21ab18 (patch) | |
tree | bcd38df96c246ee691e254cdf8559b4ae2eda1a4 /source4/dns_server/pydns.c | |
parent | 0504065948eec9bd65296d5956b5863d9af06e41 (diff) | |
download | samba-87cd68c1dc0427521061f8febbcc18d73e21ab18.tar.gz |
dns_server: Add a python module directly accessing DNS records in sam.ldb
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Diffstat (limited to 'source4/dns_server/pydns.c')
-rw-r--r-- | source4/dns_server/pydns.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/source4/dns_server/pydns.c b/source4/dns_server/pydns.c new file mode 100644 index 00000000000..1fad6922ed0 --- /dev/null +++ b/source4/dns_server/pydns.c @@ -0,0 +1,225 @@ +/* + Unix SMB/CIFS implementation. + + Python DNS server wrapper + + Copyright (C) 2015 Andrew Bartlett + + This program 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; either version 3 of the License, or + (at your option) any later version. + + 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/>. +*/ + +#include <Python.h> +#include "includes.h" +#include <pyldb.h> +#include <pytalloc.h> +#include "dns_server/dnsserver_common.h" +#include "dsdb/samdb/samdb.h" +#include "dsdb/common/util.h" +#include "librpc/gen_ndr/ndr_dnsp.h" +#include "librpc/rpc/pyrpc_util.h" + +/* FIXME: These should be in a header file somewhere */ +#define PyErr_LDB_OR_RAISE(py_ldb, ldb) \ + if (!py_check_dcerpc_type(py_ldb, "ldb", "Ldb")) { \ + PyErr_SetString(py_ldb_get_exception(), "Ldb connection object required"); \ + return NULL; \ + } \ + ldb = pyldb_Ldb_AsLdbContext(py_ldb); + +static PyObject *py_ldb_get_exception(void) +{ + PyObject *mod = PyImport_ImportModule("ldb"); + if (mod == NULL) + return NULL; + + return PyObject_GetAttrString(mod, "LdbError"); +} + +static PyObject *py_dnsp_DnssrvRpcRecord_get_list(struct dnsp_DnssrvRpcRecord *records, + uint16_t num_records) +{ + PyObject *py_dns_list; + int i; + py_dns_list = PyList_New(num_records); + if (py_dns_list == NULL) { + return NULL; + } + for (i = 0; i < num_records; i++) { + PyObject *py_dns_record; + py_dns_record = py_return_ndr_struct("samba.dcerpc.dnsp", "DnssrvRpcRecord", records, &records[i]); + PyList_SetItem(py_dns_list, i, py_dns_record); + } + return py_dns_list; +} + +static int py_dnsp_DnssrvRpcRecord_get_array(PyObject *value, + TALLOC_CTX *mem_ctx, + struct dnsp_DnssrvRpcRecord **records, + uint16_t *num_records) +{ + int i; + struct dnsp_DnssrvRpcRecord *recs; + PY_CHECK_TYPE(&PyList_Type, value, return -1;); + recs = talloc_array(mem_ctx, struct dnsp_DnssrvRpcRecord, + PyList_GET_SIZE(value)); + if (recs == NULL) { + PyErr_NoMemory(); + return -1; + } + for (i = 0; i < PyList_GET_SIZE(value); i++) { + bool type_correct; + PyObject *item = PyList_GET_ITEM(value, i); + type_correct = py_check_dcerpc_type(item, "samba.dcerpc.dnsp", "DnssrvRpcRecord"); + if (type_correct == false) { + return -1; + } + if (talloc_reference(mem_ctx, pytalloc_get_mem_ctx(item)) == NULL) { + PyErr_NoMemory(); + return -1; + } + recs[i] = *(struct dnsp_DnssrvRpcRecord *)pytalloc_get_ptr(item); + } + *records = recs; + *num_records = PyList_GET_SIZE(value); + return 0; +} + +static PyObject *py_dsdb_dns_lookup(PyObject *self, PyObject *args) +{ + struct ldb_context *samdb; + PyObject *py_ldb; + char *dns_name; + TALLOC_CTX *frame; + NTSTATUS status; + WERROR werr; + struct dns_server_zone *zones_list; + struct ldb_dn *dn; + struct dnsp_DnssrvRpcRecord *records; + uint16_t num_records; + + if (!PyArg_ParseTuple(args, "Os", &py_ldb, &dns_name)) { + return NULL; + } + PyErr_LDB_OR_RAISE(py_ldb, samdb); + + frame = talloc_stackframe(); + + status = dns_common_zones(samdb, frame, &zones_list); + if (!NT_STATUS_IS_OK(status)) { + PyErr_SetNTSTATUS(status); + return NULL; + } + + werr = dns_common_name2dn(samdb, zones_list, frame, dns_name, &dn); + if (!W_ERROR_IS_OK(werr)) { + PyErr_SetWERROR(werr); + return NULL; + } + + werr = dns_common_lookup(samdb, + frame, + dn, + &records, + &num_records, + NULL); + if (!W_ERROR_IS_OK(werr)) { + PyErr_SetWERROR(werr); + return NULL; + } + + return py_dnsp_DnssrvRpcRecord_get_list(records, num_records); +} + +static PyObject *py_dsdb_dns_replace(PyObject *self, PyObject *args) +{ + struct ldb_context *samdb; + PyObject *py_ldb, *py_dns_records; + char *dns_name; + TALLOC_CTX *frame; + NTSTATUS status; + WERROR werr; + int ret; + struct dns_server_zone *zones_list; + struct ldb_dn *dn; + struct dnsp_DnssrvRpcRecord *records; + uint16_t num_records; + + /* + * TODO: This is a shocking abuse, but matches what the + * internal DNS server does, it should be pushed into + * dns_common_replace() + */ + static const int serial = 110; + + if (!PyArg_ParseTuple(args, "OsO", &py_ldb, &dns_name, &py_dns_records)) { + return NULL; + } + PyErr_LDB_OR_RAISE(py_ldb, samdb); + + frame = talloc_stackframe(); + + status = dns_common_zones(samdb, frame, &zones_list); + if (!NT_STATUS_IS_OK(status)) { + PyErr_SetNTSTATUS(status); + return NULL; + } + + werr = dns_common_name2dn(samdb, zones_list, frame, dns_name, &dn); + if (!W_ERROR_IS_OK(werr)) { + PyErr_SetWERROR(werr); + return NULL; + } + + ret = py_dnsp_DnssrvRpcRecord_get_array(py_dns_records, + frame, + &records, &num_records); + if (ret != 0) { + return NULL; + } + + werr = dns_common_replace(samdb, + frame, + dn, + false, /* Not adding a record */ + serial, + records, + num_records); + if (!W_ERROR_IS_OK(werr)) { + PyErr_SetWERROR(werr); + return NULL; + } + + Py_RETURN_NONE; +} + +static PyMethodDef py_dsdb_dns_methods[] = { + + { "lookup", (PyCFunction)py_dsdb_dns_lookup, + METH_VARARGS, "Get the DNS database entries for a DNS name"}, + { "replace", (PyCFunction)py_dsdb_dns_replace, + METH_VARARGS, "Replace the DNS database entries for a DNS name"}, + { NULL } +}; + +void initdsdb_dns(void); + +void initdsdb_dns(void) +{ + PyObject *m; + + m = Py_InitModule3("dsdb_dns", py_dsdb_dns_methods, + "Python bindings for the DNS objects in the directory service databases."); + if (m == NULL) + return; +} |