rlm_python import error undefinde symbol

[Alexander Yu. Solodukhin]

Alexander Yu. Solodukhin <alt at softwarium.net> писал(а) в своём письме Sat,  
28 Feb 2009 22:40:35 +0200:

> Hi all.
> I try to use rlm_python and got import error on importing any module  
> that relevant on shared object.
> Here an rlm_python configuration:
>
> ## cut
> python {
>          mod_instantiate = account
>          func_instantiate = instantiate
>
>          mod_authorize = account
>          func_authorize = authorize
>
>          mod_accounting = account
>          func_accounting = accounting
>
>          mod_preproxy = account
>          func_preproxy = preproxy
>
>          mod_postproxy = account
>          func_postproxy = postproxy
>
>          mod_postauth = account
>          func_postauth = postauth
>
>          mod_detach = account
>          func_detach = detach
> }
> ## end cut
>
> account.py is radiusd_test.py from src/modules/rlm_python with one line  
> added on top of file:
> import time
>
> 'time' is not plain python module, it is shared object found at  
> /usr/lib/python2.5/lib-dynload/time.so
>
> After starting radius i got this error:
>
> rlm_python:python_load_function: module 'account' is not found
> rlm_python:EXCEPT:<type 'exceptions.ImportError'>:  
> /usr/lib/python2.5/lib-dynload/time.so: undefined symbol:  
> PyExc_ValueError
>
> I was examine rlm_python code, and example 'C' code from python  
> documentation on how to embedd python into 'C', and don't found major  
> differences.
>
> This code works fine:
>
> #include <Python.h>
>
> int
> main(int argc, char *argv[])
> {
>      PyObject *pName, *pModule, *pDict, *pFunc;
>      PyObject *pArgs, *pValue;
>      int i;
>
>      if (argc < 3) {
>          fprintf(stderr,"Usage: call pythonfile funcname [args]\n");
>          return 1;
>      }
>
>      Py_Initialize();
>      pName = PyString_FromString(argv[1]);
>      /* Error checking of pName left out */
>      Py_INCREF(pName);
>
>      pModule = PyImport_Import(pName);
>      Py_DECREF(pName);
>
>      if (pModule != NULL) {
>          pFunc = PyObject_GetAttrString(pModule, argv[2]);
>          /* pFunc is a new reference */
>
>          if (pFunc && PyCallable_Check(pFunc)) {
>              pArgs = PyTuple_New(argc - 3);
>              for (i = 0; i < argc - 3; ++i) {
>                  pValue = PyInt_FromLong(atoi(argv[i + 3]));
>                  if (!pValue) {
>                      Py_DECREF(pArgs);
>                      Py_DECREF(pModule);
>                      fprintf(stderr, "Cannot convert argument\n");
>                      return 1;
>                  }
>                  /* pValue reference stolen here: */
>                  PyTuple_SetItem(pArgs, i, pValue);
>              }
>              pValue = PyObject_CallObject(pFunc, pArgs);
>              Py_DECREF(pArgs);
>              if (pValue != NULL) {
>                  printf("Result of call: %ld\n", PyInt_AsLong(pValue));
>                  Py_DECREF(pValue);
>              }
>              else {
>                  Py_DECREF(pFunc);
>                  Py_DECREF(pModule);
>                  PyErr_Print();
>                  fprintf(stderr,"Call failed\n");
>                  return 1;
>              }
>          }
>          else {
>              if (PyErr_Occurred())
>                  PyErr_Print();
>              fprintf(stderr, "Cannot find function \"%s\"\n", argv[2]);
>          }
>          Py_XDECREF(pFunc);
>          Py_DECREF(pModule);
>      }
>      else {
>          PyErr_Print();
>          fprintf(stderr, "Failed to load \"%s\"\n", argv[1]);
>          return 1;
>      }
>      Py_Finalize();
>      return 0;
> }
>
> Compiled with:
> gcc call.c -o call -I/usr/include/python2.5 -L/usr/lib/python2.5/config  
> -lpython2.5
>
> Why this code does not through 'undefined symbol' error and rlm_python  
> does?
>
> PS: I read mailing list before posting this question and saw that this  
> problem was found in 2007. I try newst freeradius 2.1.3 and problem  
> still exists.
>
> Any feedback will be great.
>
>

gcc -shared  .libs/rlm_python.o  -Wl,--rpath  
-Wl,/root/freeradius-server-2.1.3/src/lib/.libs -Wl,--rpath  
-Wl,/usr/lib/freeradius  
/root/freeradius-server-2.1.3/src/lib/.libs/libfreeradius-radius.so  
-L/usr/lib/python2.5/config -ldl -lutil -lpython2.5 -lm -lnsl -lresolv  
-lpthread  -Wl,-export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions  
-Wl,-soname -Wl,rlm_python-2.1.3.so -o .libs/rlm_python-2.1.3.so  
/usr/lib/python2.5/lib-dynload/*.so  
/usr/lib/python-support/python-mysqldb/python2.5/_mysql.so

solves the problem (/usr/lib/python2.5/lib-dynload/*.so  
/usr/lib/python-support/python-mysqldb/python2.5/_mysql.so), but it's not  
right way to fix this problem :)


-- 
ISP CrIS, Softwarium