Simple apache module

#include <httpd.h>
#include <http_protocol.h>
#include <http_config.h>
#include <util_filter.h>

static int getadsldap_handler(request_rec* r) {
    if (!r->handler || strcmp(r->handler, "getadsldap"))
        return DECLINED;

    if (r->method_number != M_GET)
        return HTTP_METHOD_NOT_ALLOWED;

    apr_table_add(r->subprocess_env, "USER_VAR2", "mytest");
    apr_table_add(r->headers_out, "USER_VAR2", "mytest");
    ap_add_output_filter("add-headers", NULL, r, r->connection);

    return OK;
}

static apr_status_t getadsldap_filter_out(ap_filter_t *f, apr_bucket_brigade *in) {
    apr_table_addn(f->r->subprocess_env, "USER_VAR2", "mytest");
    apr_table_addn(f->r->headers_in, "REMOTE_VAR2", "mytest");

    ap_remove_output_filter(f);

    return ap_pass_brigade(f->next,in);
}

static void register_hooks(apr_pool_t* pool) {
    ap_hook_handler(getadsldap_handler, NULL, NULL, APR_HOOK_MIDDLE);
    ap_register_output_filter("add-headers", getadsldap_filter_out, NULL, AP_FTYPE_RESOURCE );
}

module AP_MODULE_DECLARE_DATA getadsldap_module = {
    STANDARD20_MODULE_STUFF,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    register_hooks
};