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449 lines
11 KiB
449 lines
11 KiB
/***********************************************************
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Written by:
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Fred Gansevles <Fred.Gansevles@cs.utwente.nl>
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B&O group,
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Faculteit der Informatica,
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Universiteit Twente,
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Enschede,
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the Netherlands.
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******************************************************************/
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/* NIS module implementation */
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#include "Python.h"
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#include <sys/time.h>
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#include <sys/types.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#ifdef __sgi
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/* This is missing from rpcsvc/ypclnt.h */
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extern int yp_get_default_domain(char **);
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#endif
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PyDoc_STRVAR(get_default_domain__doc__,
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"get_default_domain() -> str\n\
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Corresponds to the C library yp_get_default_domain() call, returning\n\
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the default NIS domain.\n");
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PyDoc_STRVAR(match__doc__,
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"match(key, map, domain = defaultdomain)\n\
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Corresponds to the C library yp_match() call, returning the value of\n\
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key in the given map. Optionally domain can be specified but it\n\
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defaults to the system default domain.\n");
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PyDoc_STRVAR(cat__doc__,
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"cat(map, domain = defaultdomain)\n\
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Returns the entire map as a dictionary. Optionally domain can be\n\
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specified but it defaults to the system default domain.\n");
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PyDoc_STRVAR(maps__doc__,
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"maps(domain = defaultdomain)\n\
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Returns an array of all available NIS maps within a domain. If domain\n\
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is not specified it defaults to the system default domain.\n");
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static PyObject *NisError;
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static PyObject *
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nis_error (int err)
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{
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PyErr_SetString(NisError, yperr_string(err));
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return NULL;
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}
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static struct nis_map {
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char *alias;
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char *map;
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int fix;
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} aliases [] = {
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{"passwd", "passwd.byname", 0},
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{"group", "group.byname", 0},
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{"networks", "networks.byaddr", 0},
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{"hosts", "hosts.byname", 0},
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{"protocols", "protocols.bynumber", 0},
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{"services", "services.byname", 0},
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{"aliases", "mail.aliases", 1}, /* created with 'makedbm -a' */
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{"ethers", "ethers.byname", 0},
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{0L, 0L, 0}
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};
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static char *
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nis_mapname (char *map, int *pfix)
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{
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int i;
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*pfix = 0;
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for (i=0; aliases[i].alias != 0L; i++) {
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if (!strcmp (aliases[i].alias, map)) {
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*pfix = aliases[i].fix;
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return aliases[i].map;
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}
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if (!strcmp (aliases[i].map, map)) {
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*pfix = aliases[i].fix;
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return aliases[i].map;
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}
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}
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return map;
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}
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#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)
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typedef int (*foreachfunc)(unsigned long, char *, int, char *, int, void *);
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#else
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typedef int (*foreachfunc)(int, char *, int, char *, int, char *);
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#endif
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struct ypcallback_data {
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PyObject *dict;
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int fix;
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PyThreadState *state;
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};
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static int
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nis_foreach (int instatus, char *inkey, int inkeylen, char *inval,
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int invallen, struct ypcallback_data *indata)
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{
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if (instatus == YP_TRUE) {
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PyObject *key;
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PyObject *val;
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int err;
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PyEval_RestoreThread(indata->state);
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if (indata->fix) {
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if (inkeylen > 0 && inkey[inkeylen-1] == '\0')
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inkeylen--;
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if (invallen > 0 && inval[invallen-1] == '\0')
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invallen--;
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}
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key = PyString_FromStringAndSize(inkey, inkeylen);
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val = PyString_FromStringAndSize(inval, invallen);
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if (key == NULL || val == NULL) {
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/* XXX error -- don't know how to handle */
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PyErr_Clear();
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Py_XDECREF(key);
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Py_XDECREF(val);
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indata->state = PyEval_SaveThread();
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return 1;
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}
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err = PyDict_SetItem(indata->dict, key, val);
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Py_DECREF(key);
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Py_DECREF(val);
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if (err != 0)
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PyErr_Clear();
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indata->state = PyEval_SaveThread();
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if (err != 0)
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return 1;
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return 0;
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}
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return 1;
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}
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static PyObject *
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nis_get_default_domain (PyObject *self)
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{
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char *domain;
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int err;
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PyObject *res;
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if ((err = yp_get_default_domain(&domain)) != 0)
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return nis_error(err);
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res = PyString_FromStringAndSize (domain, strlen(domain));
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return res;
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}
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static PyObject *
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nis_match (PyObject *self, PyObject *args, PyObject *kwdict)
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{
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char *match;
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char *domain = NULL;
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int keylen, len;
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char *key, *map;
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int err;
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PyObject *res;
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int fix;
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static char *kwlist[] = {"key", "map", "domain", NULL};
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if (!PyArg_ParseTupleAndKeywords(args, kwdict,
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"t#s|s:match", kwlist,
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&key, &keylen, &map, &domain))
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return NULL;
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if (!domain && ((err = yp_get_default_domain(&domain)) != 0))
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return nis_error(err);
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map = nis_mapname (map, &fix);
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if (fix)
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keylen++;
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Py_BEGIN_ALLOW_THREADS
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err = yp_match (domain, map, key, keylen, &match, &len);
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Py_END_ALLOW_THREADS
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if (fix)
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len--;
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if (err != 0)
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return nis_error(err);
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res = PyString_FromStringAndSize (match, len);
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free (match);
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return res;
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}
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static PyObject *
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nis_cat (PyObject *self, PyObject *args, PyObject *kwdict)
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{
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char *domain = NULL;
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char *map;
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struct ypall_callback cb;
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struct ypcallback_data data;
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PyObject *dict;
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int err;
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static char *kwlist[] = {"map", "domain", NULL};
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if (!PyArg_ParseTupleAndKeywords(args, kwdict, "s|s:cat",
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kwlist, &map, &domain))
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return NULL;
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if (!domain && ((err = yp_get_default_domain(&domain)) != 0))
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return nis_error(err);
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dict = PyDict_New ();
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if (dict == NULL)
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return NULL;
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cb.foreach = (foreachfunc)nis_foreach;
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data.dict = dict;
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map = nis_mapname (map, &data.fix);
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cb.data = (char *)&data;
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data.state = PyEval_SaveThread();
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err = yp_all (domain, map, &cb);
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PyEval_RestoreThread(data.state);
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if (err != 0) {
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Py_DECREF(dict);
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return nis_error(err);
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}
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return dict;
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}
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/* These should be u_long on Sun h/w but not on 64-bit h/w.
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This is not portable to machines with 16-bit ints and no prototypes */
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#ifndef YPPROC_MAPLIST
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#define YPPROC_MAPLIST 11
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#endif
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#ifndef YPPROG
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#define YPPROG 100004
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#endif
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#ifndef YPVERS
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#define YPVERS 2
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#endif
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typedef char *domainname;
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typedef char *mapname;
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enum nisstat {
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NIS_TRUE = 1,
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NIS_NOMORE = 2,
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NIS_FALSE = 0,
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NIS_NOMAP = -1,
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NIS_NODOM = -2,
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NIS_NOKEY = -3,
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NIS_BADOP = -4,
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NIS_BADDB = -5,
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NIS_YPERR = -6,
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NIS_BADARGS = -7,
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NIS_VERS = -8
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};
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typedef enum nisstat nisstat;
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struct nismaplist {
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mapname map;
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struct nismaplist *next;
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};
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typedef struct nismaplist nismaplist;
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struct nisresp_maplist {
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nisstat stat;
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nismaplist *maps;
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};
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typedef struct nisresp_maplist nisresp_maplist;
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static struct timeval TIMEOUT = { 25, 0 };
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static
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bool_t
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nis_xdr_domainname(XDR *xdrs, domainname *objp)
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{
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if (!xdr_string(xdrs, objp, YPMAXDOMAIN)) {
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return (FALSE);
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}
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return (TRUE);
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}
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static
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bool_t
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nis_xdr_mapname(XDR *xdrs, mapname *objp)
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{
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if (!xdr_string(xdrs, objp, YPMAXMAP)) {
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return (FALSE);
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}
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return (TRUE);
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}
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static
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bool_t
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nis_xdr_ypmaplist(XDR *xdrs, nismaplist *objp)
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{
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if (!nis_xdr_mapname(xdrs, &objp->map)) {
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return (FALSE);
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}
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if (!xdr_pointer(xdrs, (char **)&objp->next,
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sizeof(nismaplist), (xdrproc_t)nis_xdr_ypmaplist))
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{
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return (FALSE);
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}
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return (TRUE);
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}
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static
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bool_t
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nis_xdr_ypstat(XDR *xdrs, nisstat *objp)
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{
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if (!xdr_enum(xdrs, (enum_t *)objp)) {
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return (FALSE);
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}
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return (TRUE);
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}
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static
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bool_t
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nis_xdr_ypresp_maplist(XDR *xdrs, nisresp_maplist *objp)
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{
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if (!nis_xdr_ypstat(xdrs, &objp->stat)) {
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return (FALSE);
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}
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if (!xdr_pointer(xdrs, (char **)&objp->maps,
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sizeof(nismaplist), (xdrproc_t)nis_xdr_ypmaplist))
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{
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return (FALSE);
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}
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return (TRUE);
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}
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static
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nisresp_maplist *
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nisproc_maplist_2(domainname *argp, CLIENT *clnt)
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{
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static nisresp_maplist res;
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memset(&res, 0, sizeof(res));
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if (clnt_call(clnt, YPPROC_MAPLIST,
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(xdrproc_t)nis_xdr_domainname, (caddr_t)argp,
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(xdrproc_t)nis_xdr_ypresp_maplist, (caddr_t)&res,
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TIMEOUT) != RPC_SUCCESS)
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{
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return (NULL);
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}
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return (&res);
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}
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static
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nismaplist *
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nis_maplist (char *dom)
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{
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nisresp_maplist *list;
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CLIENT *cl;
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char *server = NULL;
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int mapi = 0;
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while (!server && aliases[mapi].map != 0L) {
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yp_master (dom, aliases[mapi].map, &server);
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mapi++;
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}
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if (!server) {
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PyErr_SetString(NisError, "No NIS master found for any map");
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return NULL;
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}
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cl = clnt_create(server, YPPROG, YPVERS, "tcp");
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if (cl == NULL) {
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PyErr_SetString(NisError, clnt_spcreateerror(server));
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goto finally;
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}
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list = nisproc_maplist_2 (&dom, cl);
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clnt_destroy(cl);
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if (list == NULL)
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goto finally;
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if (list->stat != NIS_TRUE)
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goto finally;
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free(server);
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return list->maps;
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finally:
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free(server);
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return NULL;
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}
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static PyObject *
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nis_maps (PyObject *self, PyObject *args, PyObject *kwdict)
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{
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char *domain = NULL;
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nismaplist *maps;
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PyObject *list;
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int err;
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static char *kwlist[] = {"domain", NULL};
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if (!PyArg_ParseTupleAndKeywords(args, kwdict,
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"|s:maps", kwlist, &domain))
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return NULL;
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if (!domain && ((err = yp_get_default_domain (&domain)) != 0)) {
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nis_error(err);
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return NULL;
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}
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if ((maps = nis_maplist (domain)) == NULL)
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return NULL;
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if ((list = PyList_New(0)) == NULL)
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return NULL;
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for (maps = maps; maps; maps = maps->next) {
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PyObject *str = PyString_FromString(maps->map);
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if (!str || PyList_Append(list, str) < 0)
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{
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Py_DECREF(list);
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list = NULL;
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break;
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}
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Py_DECREF(str);
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}
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/* XXX Shouldn't we free the list of maps now? */
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return list;
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}
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static PyMethodDef nis_methods[] = {
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{"match", (PyCFunction)nis_match,
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METH_VARARGS | METH_KEYWORDS,
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match__doc__},
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{"cat", (PyCFunction)nis_cat,
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METH_VARARGS | METH_KEYWORDS,
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cat__doc__},
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{"maps", (PyCFunction)nis_maps,
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METH_VARARGS | METH_KEYWORDS,
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maps__doc__},
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{"get_default_domain", (PyCFunction)nis_get_default_domain,
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METH_NOARGS,
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get_default_domain__doc__},
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{NULL, NULL} /* Sentinel */
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};
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PyDoc_STRVAR(nis__doc__,
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"This module contains functions for accessing NIS maps.\n");
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void
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initnis (void)
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{
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PyObject *m, *d;
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m = Py_InitModule3("nis", nis_methods, nis__doc__);
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if (m == NULL)
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return;
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d = PyModule_GetDict(m);
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NisError = PyErr_NewException("nis.error", NULL, NULL);
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if (NisError != NULL)
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PyDict_SetItemString(d, "error", NisError);
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}
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