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/* NB: PROTOTYPE SUGGESTION - NOT COMPILE TESTED */

/* openvpn-plugin.h */
struct openvpn_plugin_args_open_in
{
  const int type_mask;
  const char ** const argv;
  const char ** const envp;
  void (*plugin_function_log) (const char *plgname, openvpn_plugin_log_flags_t f, const char *m, ...);
};

#ifdef PLUGIN_NAME
static void (*_plugin_log) (const char *plgname, openvpn_plugin_log_flags_t f, const char *m, ...);
#define OPENVPN_PREPARE_LOG_FUNCTION(plgargs_in) \
        _plugin_log = (plgargs_in)->plugin_function_log;
#define plugin_log(flags, fmt, logdata...) _plugin_log(PLUGIN_NAME, flags, fmt, ## logdata);
#endif


/* how to use it in a plug-in: */

#define PLUGIN_NAME "demo"
#include <openvpn-plugin.h>

OPENVPN_EXPORT int
openvpn_plugin_open_v3 (const int v3structver,
                        struct openvpn_plugin_args_open_in const *args,
                        struct openvpn_plugin_args_open_return *ret)
{
        OPENVPN_PREPARE_LOG_FUNCTION(args);

        plugin_log(PLOG_INFO, "Hello world!");
}