diff options
Diffstat (limited to 'source4/lib/messaging/pymessaging.c')
| -rw-r--r-- | source4/lib/messaging/pymessaging.c | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/source4/lib/messaging/pymessaging.c b/source4/lib/messaging/pymessaging.c new file mode 100644 index 0000000000..1c22fb431a --- /dev/null +++ b/source4/lib/messaging/pymessaging.c @@ -0,0 +1,559 @@ +/* + Unix SMB/CIFS implementation. + Copyright © Jelmer Vernooij <jelmer@samba.org> 2008 + + Based on the equivalent for EJS: + Copyright © Andrew Tridgell <tridge@samba.org> 2005 + + 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 "includes.h" +#include <Python.h> +#include "libcli/util/pyerrors.h" +#include "librpc/rpc/pyrpc.h" +#include "lib/messaging/irpc.h" +#include "lib/messaging/messaging.h" +#include "lib/events/events.h" +#include "cluster/cluster.h" +#include "param/param.h" +#include "librpc/gen_ndr/py_irpc.h" + +PyAPI_DATA(PyTypeObject) messaging_Type; +PyAPI_DATA(PyTypeObject) irpc_ClientConnectionType; + +static bool server_id_from_py(PyObject *object, struct server_id *server_id) +{ + if (!PyTuple_Check(object)) { + PyErr_SetString(PyExc_ValueError, "Expected tuple"); + return false; + } + + if (PyTuple_Size(object) == 3) { + return PyArg_ParseTuple(object, "iii", &server_id->id, &server_id->id2, &server_id->node); + } else { + int id, id2; + if (!PyArg_ParseTuple(object, "ii", &id, &id2)) + return false; + *server_id = cluster_id(id, id2); + return true; + } +} + +typedef struct { + PyObject_HEAD + TALLOC_CTX *mem_ctx; + struct messaging_context *msg_ctx; +} messaging_Object; + +PyObject *py_messaging_connect(PyTypeObject *self, PyObject *args, PyObject *kwargs) +{ + struct event_context *ev; + const char *kwnames[] = { "own_id", "messaging_path", NULL }; + PyObject *own_id = Py_None; + const char *messaging_path = NULL; + messaging_Object *ret; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|Oz:connect", + discard_const_p(char *, kwnames), &own_id, &messaging_path)) { + return NULL; + } + + ret = PyObject_New(messaging_Object, &messaging_Type); + if (ret == NULL) + return NULL; + + ret->mem_ctx = talloc_new(NULL); + + ev = event_context_init(ret->mem_ctx); + + if (messaging_path == NULL) { + messaging_path = lp_messaging_path(ret, global_loadparm); + } else { + messaging_path = talloc_strdup(ret->mem_ctx, messaging_path); + } + + if (own_id != Py_None) { + struct server_id server_id; + + if (!server_id_from_py(own_id, &server_id)) + return NULL; + + ret->msg_ctx = messaging_init(ret->mem_ctx, + messaging_path, + server_id, + lp_iconv_convenience(global_loadparm), + ev); + } else { + ret->msg_ctx = messaging_client_init(ret->mem_ctx, + messaging_path, + lp_iconv_convenience(global_loadparm), + ev); + } + + if (ret->msg_ctx == NULL) { + PyErr_SetString(PyExc_RuntimeError, "messaging_connect unable to create a messaging context"); + talloc_free(ret->mem_ctx); + return NULL; + } + + return (PyObject *)ret; +} + +static void py_messaging_dealloc(PyObject *self) +{ + messaging_Object *iface = (messaging_Object *)self; + talloc_free(iface->msg_ctx); + PyObject_Del(self); +} + +static PyObject *py_messaging_send(PyObject *self, PyObject *args, PyObject *kwargs) +{ + messaging_Object *iface = (messaging_Object *)self; + uint32_t msg_type; + DATA_BLOB data; + PyObject *target; + NTSTATUS status; + struct server_id server; + const char *kwnames[] = { "target", "msg_type", "data", NULL }; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "Ois#|:send", + discard_const_p(char *, kwnames), &target, &msg_type, &data.data, &data.length)) { + return NULL; + } + + if (!server_id_from_py(target, &server)) + return NULL; + + status = messaging_send(iface->msg_ctx, server, msg_type, &data); + if (NT_STATUS_IS_ERR(status)) { + PyErr_SetNTSTATUS(status); + return NULL; + } + + return Py_None; +} + +static void py_msg_callback_wrapper(struct messaging_context *msg, void *private, + uint32_t msg_type, + struct server_id server_id, DATA_BLOB *data) +{ + PyObject *callback = (PyObject *)private; + + PyObject_CallFunction(callback, discard_const_p(char, "i(iii)s#"), msg_type, + server_id.id, server_id.id2, server_id.node, + data->data, data->length); +} + +static PyObject *py_messaging_register(PyObject *self, PyObject *args, PyObject *kwargs) +{ + messaging_Object *iface = (messaging_Object *)self; + uint32_t msg_type = -1; + PyObject *callback; + NTSTATUS status; + const char *kwnames[] = { "callback", "msg_type", NULL }; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|i:send", + discard_const_p(char *, kwnames), &callback, &msg_type)) { + return NULL; + } + + Py_INCREF(callback); + + if (msg_type == -1) { + status = messaging_register_tmp(iface->msg_ctx, callback, + py_msg_callback_wrapper, &msg_type); + } else { + status = messaging_register(iface->msg_ctx, callback, + msg_type, py_msg_callback_wrapper); + } + if (NT_STATUS_IS_ERR(status)) { + PyErr_SetNTSTATUS(status); + return NULL; + } + + return PyLong_FromLong(msg_type); +} + +static PyObject *py_messaging_deregister(PyObject *self, PyObject *args, PyObject *kwargs) +{ + messaging_Object *iface = (messaging_Object *)self; + uint32_t msg_type = -1; + PyObject *callback; + const char *kwnames[] = { "callback", "msg_type", NULL }; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|i:send", + discard_const_p(char *, kwnames), &callback, &msg_type)) { + return NULL; + } + + messaging_deregister(iface->msg_ctx, msg_type, callback); + + Py_DECREF(callback); + + return Py_None; +} + +static PyObject *py_messaging_add_name(PyObject *self, PyObject *args, PyObject *kwargs) +{ + messaging_Object *iface = (messaging_Object *)self; + NTSTATUS status; + char *name; + const char *kwnames[] = { "name", NULL }; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|:send", + discard_const_p(char *, kwnames), &name)) { + return NULL; + } + + status = irpc_add_name(iface->msg_ctx, name); + if (NT_STATUS_IS_ERR(status)) { + PyErr_SetNTSTATUS(status); + return NULL; + } + + return Py_None; +} + + +static PyObject *py_messaging_remove_name(PyObject *self, PyObject *args, PyObject *kwargs) +{ + messaging_Object *iface = (messaging_Object *)self; + char *name; + const char *kwnames[] = { "name", NULL }; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|:send", + discard_const_p(char *, kwnames), &name)) { + return NULL; + } + + irpc_remove_name(iface->msg_ctx, name); + + return Py_None; +} + +static PyMethodDef py_messaging_methods[] = { + { "send", (PyCFunction)py_messaging_send, METH_VARARGS|METH_KEYWORDS, + "S.send(target, msg_type, data) -> None\nSend a message" }, + { "register", (PyCFunction)py_messaging_register, METH_VARARGS|METH_KEYWORDS, + "S.register(callback, msg_type=None) -> msg_type\nRegister a message handler" }, + { "deregister", (PyCFunction)py_messaging_deregister, METH_VARARGS|METH_KEYWORDS, + "S.deregister(callback, msg_type) -> None\nDeregister a message handler" }, + { "add_name", (PyCFunction)py_messaging_add_name, METH_VARARGS|METH_KEYWORDS, "S.add_name(name) -> None\nListen on another name" }, + { "remove_name", (PyCFunction)py_messaging_remove_name, METH_VARARGS|METH_KEYWORDS, "S.remove_name(name) -> None\nStop listening on a name" }, + { NULL, NULL, 0, NULL } +}; + +static PyObject *py_messaging_server_id(PyObject *obj, void *closure) +{ + messaging_Object *iface = (messaging_Object *)obj; + struct server_id server_id = messaging_get_server_id(iface->msg_ctx); + + return Py_BuildValue("(iii)", server_id.id, server_id.id2, + server_id.node); +} + +static PyGetSetDef py_messaging_getset[] = { + { discard_const_p(char, "server_id"), py_messaging_server_id, NULL, + discard_const_p(char, "local server id") }, + { NULL }, +}; + + +PyTypeObject messaging_Type = { + PyObject_HEAD_INIT(NULL) 0, + .tp_name = "irpc.Messaging", + .tp_basicsize = sizeof(messaging_Object), + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_new = py_messaging_connect, + .tp_dealloc = py_messaging_dealloc, + .tp_methods = py_messaging_methods, + .tp_getset = py_messaging_getset, + .tp_doc = "Messaging(own_id=None, messaging_path=None)\n" \ + "Create a new object that can be used to communicate with the peers in the specified messaging path.\n" \ + "If no path is specified, the default path from smb.conf will be used." +}; + + +/* + state of a irpc 'connection' +*/ +typedef struct { + PyObject_HEAD + const char *server_name; + struct server_id *dest_ids; + struct messaging_context *msg_ctx; + TALLOC_CTX *mem_ctx; +} irpc_ClientConnectionObject; + +/* + setup a context for talking to a irpc server + example: + status = irpc.connect("smb_server"); +*/ + +PyObject *py_irpc_connect(PyTypeObject *self, PyObject *args, PyObject *kwargs) +{ + struct event_context *ev; + const char *kwnames[] = { "server", "own_id", "messaging_path", NULL }; + char *server; + const char *messaging_path = NULL; + PyObject *own_id = Py_None; + irpc_ClientConnectionObject *ret; + + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|Oz:connect", + discard_const_p(char *, kwnames), &server, &own_id, &messaging_path)) { + return NULL; + } + + ret = PyObject_New(irpc_ClientConnectionObject, &irpc_ClientConnectionType); + if (ret == NULL) + return NULL; + + ret->mem_ctx = talloc_new(NULL); + + ret->server_name = server; + + ev = event_context_init(ret->mem_ctx); + + if (messaging_path == NULL) { + messaging_path = lp_messaging_path(ret, global_loadparm); + } else { + messaging_path = talloc_strdup(ret->mem_ctx, messaging_path); + } + + if (own_id != Py_None) { + struct server_id server_id; + + if (!server_id_from_py(own_id, &server_id)) + return NULL; + + ret->msg_ctx = messaging_init(ret->mem_ctx, + messaging_path, + server_id, + lp_iconv_convenience(global_loadparm), + ev); + } else { + ret->msg_ctx = messaging_client_init(ret->mem_ctx, + messaging_path, + lp_iconv_convenience(global_loadparm), + ev); + } + + if (ret->msg_ctx == NULL) { + PyErr_SetString(PyExc_RuntimeError, "irpc_connect unable to create a messaging context"); + talloc_free(ret->mem_ctx); + return NULL; + } + + ret->dest_ids = irpc_servers_byname(ret->msg_ctx, ret->mem_ctx, ret->server_name); + if (ret->dest_ids == NULL || ret->dest_ids[0].id == 0) { + talloc_free(ret->mem_ctx); + PyErr_SetNTSTATUS(NT_STATUS_OBJECT_NAME_NOT_FOUND); + return NULL; + } else { + return (PyObject *)ret; + } +} + +typedef struct { + PyObject_HEAD + struct irpc_request **reqs; + int count; + int current; + TALLOC_CTX *mem_ctx; + py_data_unpack_fn unpack_fn; +} irpc_ResultObject; + + +static PyObject *irpc_result_next(irpc_ResultObject *iterator) +{ + NTSTATUS status; + + if (iterator->current >= iterator->count) { + PyErr_SetString(PyExc_StopIteration, "No more results"); + return NULL; + } + + status = irpc_call_recv(iterator->reqs[iterator->current]); + iterator->current++; + if (!NT_STATUS_IS_OK(status)) { + PyErr_SetNTSTATUS(status); + return NULL; + } + + return iterator->unpack_fn(iterator->reqs[iterator->current-1]->r); +} + +static PyObject *irpc_result_len(irpc_ResultObject *self) +{ + return PyLong_FromLong(self->count); +} + +static PyMethodDef irpc_result_methods[] = { + { "__len__", (PyCFunction)irpc_result_len, METH_NOARGS, + "Number of elements returned"}, + { NULL } +}; + +static void irpc_result_dealloc(PyObject *self) +{ + talloc_free(((irpc_ResultObject *)self)->mem_ctx); + PyObject_Del(self); +} + +PyTypeObject irpc_ResultIteratorType = { + PyObject_HEAD_INIT(NULL) 0, + .tp_name = "irpc.ResultIterator", + .tp_basicsize = sizeof(irpc_ResultObject), + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_iternext = (iternextfunc)irpc_result_next, + .tp_iter = PyObject_SelfIter, + .tp_methods = irpc_result_methods, + .tp_dealloc = irpc_result_dealloc, +}; + +static PyObject *py_irpc_call(irpc_ClientConnectionObject *p, struct PyNdrRpcMethodDef *method_def, PyObject *args, PyObject *kwargs) +{ + void *ptr; + struct irpc_request **reqs; + int i, count; + NTSTATUS status; + TALLOC_CTX *mem_ctx = talloc_new(NULL); + irpc_ResultObject *ret; + + /* allocate the C structure */ + ptr = talloc_zero_size(mem_ctx, method_def->table->calls[method_def->opnum].struct_size); + if (ptr == NULL) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + + /* convert the mpr object into a C structure */ + if (!method_def->pack_in_data(args, kwargs, ptr)) { + talloc_free(mem_ctx); + return NULL; + } + + for (count=0;p->dest_ids[count].id;count++) /* noop */ ; + + /* we need to make a call per server */ + reqs = talloc_array(mem_ctx, struct irpc_request *, count); + if (reqs == NULL) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + + /* make the actual calls */ + for (i=0;i<count;i++) { + reqs[i] = irpc_call_send(p->msg_ctx, p->dest_ids[i], + method_def->table, method_def->opnum, ptr, ptr); + if (reqs[i] == NULL) { + status = NT_STATUS_NO_MEMORY; + goto done; + } + talloc_steal(reqs, reqs[i]); + } + + ret = PyObject_New(irpc_ResultObject, &irpc_ResultIteratorType); + ret->mem_ctx = mem_ctx; + ret->reqs = reqs; + ret->count = count; + ret->current = 0; + ret->unpack_fn = method_def->unpack_out_data; + + return (PyObject *)ret; +done: + talloc_free(mem_ctx); + PyErr_SetNTSTATUS(status); + return NULL; +} + +static PyObject *py_irpc_call_wrapper(PyObject *self, PyObject *args, void *wrapped, PyObject *kwargs) +{ + irpc_ClientConnectionObject *iface = (irpc_ClientConnectionObject *)self; + struct PyNdrRpcMethodDef *md = wrapped; + + return py_irpc_call(iface, md, args, kwargs); +} + +static void py_irpc_dealloc(PyObject *self) +{ + irpc_ClientConnectionObject *iface = (irpc_ClientConnectionObject *)self; + talloc_free(iface->mem_ctx); + PyObject_Del(self); +} + +PyTypeObject irpc_ClientConnectionType = { + PyObject_HEAD_INIT(NULL) 0, + .tp_name = "irpc.ClientConnection", + .tp_basicsize = sizeof(irpc_ClientConnectionObject), + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_new = py_irpc_connect, + .tp_dealloc = py_irpc_dealloc, + .tp_doc = "ClientConnection(server, own_id=None, messaging_path=None)\n" \ + "Create a new IRPC client connection to communicate with the servers in the specified path.\n" \ + "If no path is specified, the default path from smb.conf will be used." +}; + +static bool irpc_AddNdrRpcMethods(PyTypeObject *ifacetype, const struct PyNdrRpcMethodDef *mds) +{ + int i; + for (i = 0; mds[i].name; i++) { + PyObject *ret; + struct wrapperbase *wb = calloc(sizeof(struct wrapperbase), 1); + + wb->name = discard_const_p(char, mds[i].name); + wb->flags = PyWrapperFlag_KEYWORDS; + wb->wrapper = (wrapperfunc)py_irpc_call_wrapper; + wb->doc = discard_const_p(char, mds[i].doc); + + ret = PyDescr_NewWrapper(ifacetype, wb, discard_const_p(void, &mds[i])); + + PyDict_SetItemString(ifacetype->tp_dict, mds[i].name, + (PyObject *)ret); + } + + return true; +} + +void initmessaging(void) +{ + extern void initirpc(void); + PyObject *mod; + + if (PyType_Ready(&irpc_ClientConnectionType) < 0) + return; + + if (PyType_Ready(&messaging_Type) < 0) + return; + + if (PyType_Ready(&irpc_ResultIteratorType) < 0) + return; + + if (!irpc_AddNdrRpcMethods(&irpc_ClientConnectionType, py_ndr_irpc_methods)) + return; + + mod = Py_InitModule3("messaging", NULL, "Internal RPC"); + if (mod == NULL) + return; + + initirpc(); + + Py_INCREF((PyObject *)&irpc_ClientConnectionType); + PyModule_AddObject(mod, "ClientConnection", (PyObject *)&irpc_ClientConnectionType); + + Py_INCREF((PyObject *)&messaging_Type); + PyModule_AddObject(mod, "Messaging", (PyObject *)&messaging_Type); +} |