Hello everybody,
here are my Steps how i created an C++ Module for FreeRadius.
         Create an new Module Section like:

        

modules {                                                                  

                        cpp {

                                   …

                               }

                }


          I created an new Directory named "rlm_cpp" where I putted an Makefile and my rlm_cpp.cpp File


          Makefile:

          TARGET      = rlm_cpp
SRCS        = rlm_cpp.cpp
HEADERS     =
RLM_CFLAGS  =  -I/usr/include
RLM_LIBS    =  -lc
RLM_INSTALL = install-example

## this uses the RLM_CFLAGS and RLM_LIBS and SRCS defs to make TARGET.
include ../rules.mak

$(LT_OBJS): $(HEADERS)

## the rule that RLM_INSTALL tells the parent rules.mak to use.
install-example:
        touch .


My outgoing rlm_cpp.cpp File was the *.c File I took.
Then I need to change every function of this file like this:

extern "C" {
static int cpp_authorize(void *instance, REQUEST *request)
{
...
}
}

Then I added two DEFINES at the TOP of my rlm_cpp.cpp File, because the two words are reserved names in in C.

#define operator op3578000
#define template tem34123

At the end I needed to change the the struct. First I changed the struct in radiusd.conf

struct auth_req {
...
home_server_t                     *home_server
...
}

typedef struct radclient {
...
home_server_t           *coa_server;
...
} RADCLIENT;

Also change the Typedef to:

typedef struct home_server {
...
}home_server_t;

Every struct in the Source of FreeRadius need to be changed to home_server_t!


now you should made finallay the main make and see the all should be fine compiled! at the end run "make install " and implement the new C++ Module in an Section in the radiusd.conf and it will run!

My class looks so:

#define operator op3578000
#define template tem34123

extern "C" {
  #include <freeradius-devel/ident.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  RCSID("$Id$")  
  #include <freeradius-devel/radiusd.h>
  #include <freeradius-devel/modules.h>

     
typedef struct rlm_cpp_t {
        int             boolean;
        int             value;
        char            *string;
        uint32_t        ipaddr;
} rlm_cpp_t;



extern "C"
const CONF_PARSER module_config[] = {
  { "integer", PW_TYPE_INTEGER,    offsetof(rlm_cpp_t,value), NULL,   "1" },
  { "boolean", PW_TYPE_BOOLEAN,    offsetof(rlm_cpp_t,boolean), NULL, "no"},
  { "string",  PW_TYPE_STRING_PTR, offsetof(rlm_cpp_t,string), NULL,  NULL},
  { "ipaddr",  PW_TYPE_IPADDR,     offsetof(rlm_cpp_t,ipaddr), NULL,  "*"},
 

  { NULL, -1, 0, NULL, NULL }           /* end the list */
};





extern "C" {
static int cpp_instantiate(CONF_SECTION *conf, void **instance)
{
        ...
        return RLM_MODULE_OK;
}
}


extern "C" {
static int cpp_post_auth(void *instance, REQUEST *request)
{
  VALUE_PAIR *reply;
  VALUE_PAIR *state;

               
  ...

  return RLM_MODULE_OK;
}
}



extern "C" {
static int cpp_preacct(void *instance, REQUEST *request)
{
    /* quiet the compiler */
    instance = instance;
    request = request;          
   
    ...
       
    return RLM_MODULE_OK;
}
}


extern "C" {
static int cpp_authorize(void *instance, REQUEST *request)
{
    /* quiet the compiler */
    instance = instance;
    request = request;      

    ...

   return RLM_MODULE_OK;    
}
}





extern "C" {
module_t rlm_cpp = {
        RLM_MODULE_INIT,
        "cpp",
        RLM_TYPE_THREAD_SAFE,      /* type */
        cpp_instantiate,           /* instantiation */
        NULL,                           /* detach */
        {
                NULL,                   /* authentication */
                cpp_authorize,            /* authorization */
                cpp_preacct,       /* preaccounting */
                NULL,                    /* accounting */
                NULL,               /* checksimul */
                NULL,              /* pre-proxy */
                NULL,              /* post-proxy */
                cpp_post_auth      /* post-auth */
        },
};
}  




Greetz
Patrick