cpython/Modules/pwdmodule.c

/* UNIX password file access module */

#include "Python.h"
#include "structseq.h"

#include <sys/types.h>
#include <pwd.h>

static PyStructSequence_Field struct_pwd_type_fields[] = {
	{"pw_name", "user name"},
	{"pw_passwd", "password"},
	{"pw_uid", "user id"},
	{"pw_gid", "group id"}, 
	{"pw_gecos", "real name"}, 
	{"pw_dir", "home directory"},
	{"pw_shell", "shell program"},
	{0}
};

PyDoc_STRVAR(struct_passwd__doc__,
"pwd.struct_passwd: Results from getpw*() routines.\n\n\
This object may be accessed either as a tuple of\n\
  (pw_name,pw_passwd,pw_uid,pw_gid,pw_gecos,pw_dir,pw_shell)\n\
or via the object attributes as named in the above tuple.");

static PyStructSequence_Desc struct_pwd_type_desc = {
	"pwd.struct_passwd",
	struct_passwd__doc__,
	struct_pwd_type_fields,
	7,
};

PyDoc_STRVAR(pwd__doc__,
"This module provides access to the Unix password database.\n\
It is available on all Unix versions.\n\
\n\
Password database entries are reported as 7-tuples containing the following\n\
items from the password database (see `<pwd.h>'), in order:\n\
pw_name, pw_passwd, pw_uid, pw_gid, pw_gecos, pw_dir, pw_shell.\n\
The uid and gid items are integers, all others are strings. An\n\
exception is raised if the entry asked for cannot be found.");

      
static int initialized;
static PyTypeObject StructPwdType;

static void
sets(PyObject *v, int i, const char* val)
{
  if (val) {
	  PyObject *o = PyUnicode_Decode(val, strlen(val),
					 Py_FileSystemDefaultEncoding,
					 "surrogateescape");
	  PyStructSequence_SET_ITEM(v, i, o);
  }
  else {
	  PyStructSequence_SET_ITEM(v, i, Py_None);
	  Py_INCREF(Py_None);
  }
}

static PyObject *
mkpwent(struct passwd *p)
{
	int setIndex = 0;
	PyObject *v = PyStructSequence_New(&StructPwdType);
	if (v == NULL)
		return NULL;

#define SETI(i,val) PyStructSequence_SET_ITEM(v, i, PyLong_FromLong((long) val))
#define SETS(i,val) sets(v, i, val)

	SETS(setIndex++, p->pw_name);
#ifdef __VMS
	SETS(setIndex++, "");
#else
	SETS(setIndex++, p->pw_passwd);
#endif
	SETI(setIndex++, p->pw_uid);
	SETI(setIndex++, p->pw_gid);
#ifdef __VMS
	SETS(setIndex++, "");
#else
	SETS(setIndex++, p->pw_gecos);
#endif
	SETS(setIndex++, p->pw_dir);
	SETS(setIndex++, p->pw_shell);

#undef SETS
#undef SETI

	if (PyErr_Occurred()) {
		Py_XDECREF(v);
		return NULL;
	}

	return v;
}

PyDoc_STRVAR(pwd_getpwuid__doc__,
"getpwuid(uid) -> (pw_name,pw_passwd,pw_uid,\n\
                  pw_gid,pw_gecos,pw_dir,pw_shell)\n\
Return the password database entry for the given numeric user ID.\n\
See pwd.__doc__ for more on password database entries.");

static PyObject *
pwd_getpwuid(PyObject *self, PyObject *args)
{
	unsigned int uid;
	struct passwd *p;
	if (!PyArg_ParseTuple(args, "I:getpwuid", &uid))
		return NULL;
	if ((p = getpwuid(uid)) == NULL) {
		PyErr_Format(PyExc_KeyError,
			     "getpwuid(): uid not found: %d", uid);
		return NULL;
	}
	return mkpwent(p);
}

PyDoc_STRVAR(pwd_getpwnam__doc__,
"getpwnam(name) -> (pw_name,pw_passwd,pw_uid,\n\
                    pw_gid,pw_gecos,pw_dir,pw_shell)\n\
Return the password database entry for the given user name.\n\
See pwd.__doc__ for more on password database entries.");

static PyObject *
pwd_getpwnam(PyObject *self, PyObject *args)
{
	char *name;
	struct passwd *p;
	PyObject *arg, *bytes, *retval = NULL;

	if (!PyArg_ParseTuple(args, "U:getpwnam", &arg))
		return NULL;
	if ((bytes = PyUnicode_AsEncodedString(arg,
					       Py_FileSystemDefaultEncoding,
					       "surrogateescape")) == NULL)
		return NULL;
	if (PyBytes_AsStringAndSize(bytes, &name, NULL) == -1)
		goto out;
	if ((p = getpwnam(name)) == NULL) {
		PyErr_Format(PyExc_KeyError,
			     "getpwnam(): name not found: %s", name);
		goto out;
	}
	retval = mkpwent(p);
out:
	Py_DECREF(bytes);
	return retval;
}

#ifdef HAVE_GETPWENT
PyDoc_STRVAR(pwd_getpwall__doc__,
"getpwall() -> list_of_entries\n\
Return a list of all available password database entries, \
in arbitrary order.\n\
See pwd.__doc__ for more on password database entries.");

static PyObject *
pwd_getpwall(PyObject *self)
{
	PyObject *d;
	struct passwd *p;
	if ((d = PyList_New(0)) == NULL)
		return NULL;
#if defined(PYOS_OS2) && defined(PYCC_GCC)
	if ((p = getpwuid(0)) != NULL) {
#else
	setpwent();
	while ((p = getpwent()) != NULL) {
#endif
		PyObject *v = mkpwent(p);
		if (v == NULL || PyList_Append(d, v) != 0) {
			Py_XDECREF(v);
			Py_DECREF(d);
			endpwent();
			return NULL;
		}
		Py_DECREF(v);
	}
	endpwent();
	return d;
}
#endif

static PyMethodDef pwd_methods[] = {
	{"getpwuid",	pwd_getpwuid, METH_VARARGS, pwd_getpwuid__doc__},
	{"getpwnam",	pwd_getpwnam, METH_VARARGS, pwd_getpwnam__doc__},
#ifdef HAVE_GETPWENT
	{"getpwall",	(PyCFunction)pwd_getpwall,
		METH_NOARGS,  pwd_getpwall__doc__},
#endif
	{NULL,		NULL}		/* sentinel */
};

static struct PyModuleDef pwdmodule = {
	PyModuleDef_HEAD_INIT,
	"pwd",
	pwd__doc__,
	-1,
	pwd_methods,
	NULL,
	NULL,
	NULL,
	NULL
};


PyMODINIT_FUNC
PyInit_pwd(void)
{
	PyObject *m;
	m = PyModule_Create(&pwdmodule);
	if (m == NULL)
    		return NULL;

	if (!initialized) {
		PyStructSequence_InitType(&StructPwdType, 
					  &struct_pwd_type_desc);
		initialized = 1;
	}
	Py_INCREF((PyObject *) &StructPwdType);
	PyModule_AddObject(m, "struct_passwd", (PyObject *) &StructPwdType);
	return m;
}