cpython/Modules/nismodule.c at pythoncapi · pythoncapi/cpython · GitHub

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/***********************************************************

Written by:

Fred Gansevles <Fred.Gansevles@cs.utwente.nl>

B&O group,

Faculteit der Informatica,

Universiteit Twente,

Enschede,

the Netherlands.

******************************************************************/

/* NIS module implementation */

#include "Python.h"

#include <sys/time.h>

#include <sys/types.h>

#include <rpc/rpc.h>

#include <rpcsvc/yp_prot.h>

#include <rpcsvc/ypclnt.h>

#ifdef __sgi

/* This is missing from rpcsvc/ypclnt.h */

extern int yp_get_default_domain(char **);

#endif

PyDoc_STRVAR(get_default_domain__doc__,

"get_default_domain() -> str\n\

Corresponds to the C library yp_get_default_domain() call, returning\n\

the default NIS domain.\n");

PyDoc_STRVAR(match__doc__,

"match(key, map, domain = defaultdomain)\n\

Corresponds to the C library yp_match() call, returning the value of\n\

key in the given map. Optionally domain can be specified but it\n\

defaults to the system default domain.\n");

PyDoc_STRVAR(cat__doc__,

"cat(map, domain = defaultdomain)\n\

Returns the entire map as a dictionary. Optionally domain can be\n\

specified but it defaults to the system default domain.\n");

PyDoc_STRVAR(maps__doc__,

"maps(domain = defaultdomain)\n\

Returns an array of all available NIS maps within a domain. If domain\n\

is not specified it defaults to the system default domain.\n");

static PyObject *NisError;

static PyObject *

nis_error (int err)

{

PyErr_SetString(NisError, yperr_string(err));

return NULL;

}

static struct nis_map {

char *alias;

char *map;

int fix;

} aliases [] = {

{"passwd", "passwd.byname", 0},

{"group", "group.byname", 0},

{"networks", "networks.byaddr", 0},

{"hosts", "hosts.byname", 0},

{"protocols", "protocols.bynumber", 0},

{"services", "services.byname", 0},

{"aliases", "mail.aliases", 1}, /* created with 'makedbm -a' */

{"ethers", "ethers.byname", 0},

{0L, 0L, 0}

};

static char *

nis_mapname (char *map, int *pfix)

{

int i;

*pfix = 0;

for (i=0; aliases[i].alias != 0L; i++) {

if (!strcmp (aliases[i].alias, map) || !strcmp (aliases[i].map, map)) {

*pfix = aliases[i].fix;

return aliases[i].map;

}

return map;

}

#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)

typedef int (*foreachfunc)(unsigned long, char *, int, char *, int, void *);

#else

typedef int (*foreachfunc)(int, char *, int, char *, int, char *);

#endif

struct ypcallback_data {

PyObject *dict;

int fix;

PyThreadState *state;

};

static int

nis_foreach (int instatus, char *inkey, int inkeylen, char *inval,

int invallen, struct ypcallback_data *indata)

{

if (instatus == YP_TRUE) {

PyObject *key;

PyObject *val;

int err;

PyEval_RestoreThread(indata->state);

if (indata->fix) {

if (inkeylen > 0 && inkey[inkeylen-1] == '\0')

inkeylen--;

if (invallen > 0 && inval[invallen-1] == '\0')

invallen--;

}

key = PyUnicode_DecodeFSDefaultAndSize(inkey, inkeylen);

val = PyUnicode_DecodeFSDefaultAndSize(inval, invallen);

if (key == NULL || val == NULL) {

/* XXX error -- don't know how to handle */

PyErr_Clear();

Py_XDECREF(key);

Py_XDECREF(val);

indata->state = PyEval_SaveThread();

return 1;

}

err = PyDict_SetItem(indata->dict, key, val);

Py_DECREF(key);

Py_DECREF(val);

if (err != 0)

PyErr_Clear();

indata->state = PyEval_SaveThread();

if (err != 0)

return 1;

return 0;

}

return 1;

}

static PyObject *

nis_get_default_domain (PyObject *self, PyObject *Py_UNUSED(ignored))

{

char *domain;

int err;

PyObject *res;

if ((err = yp_get_default_domain(&domain)) != 0)

return nis_error(err);

res = PyUnicode_FromStringAndSize (domain, strlen(domain));

return res;

}

static PyObject *

nis_match (PyObject *self, PyObject *args, PyObject *kwdict)

{

char *match;

char *domain = NULL;

Py_ssize_t keylen;

int len;

char *key, *map;

int err;

PyObject *ukey, *bkey, *res;

int fix;

static char *kwlist[] = {"key", "map", "domain", NULL};

if (!PyArg_ParseTupleAndKeywords(args, kwdict,

"Us|s:match", kwlist,

&ukey, &map, &domain))

return NULL;

if ((bkey = PyUnicode_EncodeFSDefault(ukey)) == NULL)

return NULL;

/* check for embedded null bytes */

if (PyBytes_AsStringAndSize(bkey, &key, &keylen) == -1) {

Py_DECREF(bkey);

return NULL;

}

if (!domain && ((err = yp_get_default_domain(&domain)) != 0)) {

Py_DECREF(bkey);

return nis_error(err);

}

map = nis_mapname (map, &fix);

if (fix)

keylen++;

Py_BEGIN_ALLOW_THREADS

err = yp_match (domain, map, key, keylen, &match, &len);

Py_END_ALLOW_THREADS

Py_DECREF(bkey);

if (fix)

len--;

if (err != 0)

return nis_error(err);

res = PyUnicode_DecodeFSDefaultAndSize(match, len);

free (match);

return res;

}

static PyObject *

nis_cat (PyObject *self, PyObject *args, PyObject *kwdict)

{

char *domain = NULL;

char *map;

struct ypall_callback cb;

struct ypcallback_data data;

PyObject *dict;

int err;

static char *kwlist[] = {"map", "domain", NULL};

if (!PyArg_ParseTupleAndKeywords(args, kwdict, "s|s:cat",

kwlist, &map, &domain))

return NULL;

if (!domain && ((err = yp_get_default_domain(&domain)) != 0))

return nis_error(err);

dict = PyDict_New ();

if (dict == NULL)

return NULL;

cb.foreach = (foreachfunc)nis_foreach;

data.dict = dict;

map = nis_mapname (map, &data.fix);

cb.data = (char *)&data;

data.state = PyEval_SaveThread();

err = yp_all (domain, map, &cb);

PyEval_RestoreThread(data.state);

if (err != 0) {

Py_DECREF(dict);

return nis_error(err);

}

return dict;

}

/* These should be u_long on Sun h/w but not on 64-bit h/w.

This is not portable to machines with 16-bit ints and no prototypes */

#ifndef YPPROC_MAPLIST

#define YPPROC_MAPLIST 11

#endif

#ifndef YPPROG

#define YPPROG 100004

#endif

#ifndef YPVERS

#define YPVERS 2

#endif

typedef char *domainname;

typedef char *mapname;

enum nisstat {

NIS_TRUE = 1,

NIS_NOMORE = 2,

NIS_FALSE = 0,

NIS_NOMAP = -1,

NIS_NODOM = -2,

NIS_NOKEY = -3,

NIS_BADOP = -4,

NIS_BADDB = -5,

NIS_YPERR = -6,

NIS_BADARGS = -7,

NIS_VERS = -8

};

typedef enum nisstat nisstat;

struct nismaplist {

mapname map;

struct nismaplist *next;

};

typedef struct nismaplist nismaplist;

struct nisresp_maplist {

nisstat stat;

nismaplist *maps;

};

typedef struct nisresp_maplist nisresp_maplist;

static struct timeval TIMEOUT = { 25, 0 };

static

bool_t

nis_xdr_domainname(XDR *xdrs, domainname *objp)

{

if (!xdr_string(xdrs, objp, YPMAXDOMAIN)) {

return (FALSE);

}

return (TRUE);

}

static

bool_t

nis_xdr_mapname(XDR *xdrs, mapname *objp)

{

if (!xdr_string(xdrs, objp, YPMAXMAP)) {

return (FALSE);

}

return (TRUE);

}

static

bool_t

nis_xdr_ypmaplist(XDR *xdrs, nismaplist *objp)

{

if (!nis_xdr_mapname(xdrs, &objp->map)) {

return (FALSE);

}

if (!xdr_pointer(xdrs, (char **)&objp->next,

sizeof(nismaplist), (xdrproc_t)nis_xdr_ypmaplist))

{

return (FALSE);

}

return (TRUE);

}

static

bool_t

nis_xdr_ypstat(XDR *xdrs, nisstat *objp)

{

if (!xdr_enum(xdrs, (enum_t *)objp)) {

return (FALSE);

}

return (TRUE);

}

static

bool_t

nis_xdr_ypresp_maplist(XDR *xdrs, nisresp_maplist *objp)

{

if (!nis_xdr_ypstat(xdrs, &objp->stat)) {

return (FALSE);

}

if (!xdr_pointer(xdrs, (char **)&objp->maps,

sizeof(nismaplist), (xdrproc_t)nis_xdr_ypmaplist))

{

return (FALSE);

}

return (TRUE);

}

static

nisresp_maplist *

nisproc_maplist_2(domainname *argp, CLIENT *clnt)

{

static nisresp_maplist res;

memset(&res, 0, sizeof(res));

if (clnt_call(clnt, YPPROC_MAPLIST,

(xdrproc_t)nis_xdr_domainname, (caddr_t)argp,

(xdrproc_t)nis_xdr_ypresp_maplist, (caddr_t)&res,

TIMEOUT) != RPC_SUCCESS)

{

return (NULL);

}

return (&res);

}

static

nismaplist *

nis_maplist (char *dom)

{

nisresp_maplist *list;

CLIENT *cl;

char *server = NULL;

int mapi = 0;

while (!server && aliases[mapi].map != 0L) {

yp_master (dom, aliases[mapi].map, &server);

mapi++;

}

if (!server) {

PyErr_SetString(NisError, "No NIS master found for any map");

return NULL;

}

cl = clnt_create(server, YPPROG, YPVERS, "tcp");

if (cl == NULL) {

PyErr_SetString(NisError, clnt_spcreateerror(server));

goto finally;

}

list = nisproc_maplist_2 (&dom, cl);

clnt_destroy(cl);

if (list == NULL)

goto finally;

if (list->stat != NIS_TRUE)

goto finally;

free(server);

return list->maps;

finally:

free(server);

return NULL;

}

static PyObject *

nis_maps (PyObject *self, PyObject *args, PyObject *kwdict)

{

char *domain = NULL;

nismaplist *maps;

PyObject *list;

int err;

static char *kwlist[] = {"domain", NULL};

if (!PyArg_ParseTupleAndKeywords(args, kwdict,

"|s:maps", kwlist, &domain))

return NULL;

if (!domain && ((err = yp_get_default_domain (&domain)) != 0)) {

nis_error(err);

return NULL;

}

if ((maps = nis_maplist (domain)) == NULL)

return NULL;

if ((list = PyList_New(0)) == NULL)

return NULL;

for (; maps; maps = maps->next) {

PyObject *str = PyUnicode_FromString(maps->map);

if (!str || PyList_Append(list, str) < 0)

{

Py_DECREF(list);

list = NULL;

break;

}

Py_DECREF(str);

}

/* XXX Shouldn't we free the list of maps now? */

return list;

}

static PyMethodDef nis_methods[] = {

{"match", (PyCFunction)nis_match,

METH_VARARGS | METH_KEYWORDS,

match__doc__},

{"cat", (PyCFunction)nis_cat,

METH_VARARGS | METH_KEYWORDS,

cat__doc__},

{"maps", (PyCFunction)nis_maps,

METH_VARARGS | METH_KEYWORDS,

maps__doc__},

{"get_default_domain", nis_get_default_domain,

METH_NOARGS,

get_default_domain__doc__},

{NULL, NULL} /* Sentinel */

};

PyDoc_STRVAR(nis__doc__,

"This module contains functions for accessing NIS maps.\n");

static struct PyModuleDef nismodule = {

PyModuleDef_HEAD_INIT,

"nis",

nis__doc__,

-1,

nis_methods,

NULL,

NULL

};

PyMODINIT_FUNC

PyInit_nis(void)

{

PyObject *m;

m = PyModule_Create(&nismodule);

if (m == NULL)

return NULL;

NisError = PyErr_NewException("nis.error", NULL, NULL);

if (NisError != NULL)

PyObject_SetAttrString(m, "error", NisError);

return m;

}

cpython/Modules/nismodule.c at pythoncapi · pythoncapi/cpython · GitHub

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