I am developping a module for freeradius. but i don't know how to get VPs from radcheck or radgroupcheck Later i maybe found one in rlm_checkval.c : checkval_instantiate (...){ ............ memset(&flags, 0, sizeof(flags)); dict_addattr(data->check_name, 0, PW_TYPE_STRING, -1,flags); dattr = dict_attrbyname(data->check_name); if (!dattr){ radlog(L_ERR, "rlm_checkval: No such attribute %s", data->check_name); checkval_detach(data); return -1; } data->chk_attr = dattr->attr; DEBUG2("rlm_checkval: Registered name %s for attribute %d", dattr->name,dattr->attr); } do_checkval(...) { tmp = request->config_items; do{ if (!(chk_vp = pairfind(tmp, data->chk_attr))){ if (!found){ DEBUG2("rlm_checkval: Could not find attribute named %s in check pairs",data->check_name); ret = RLM_MODULE_NOTFOUND; } break; } } This still doesn't work when i put my-defined Attribute in radcheck for one user : No XXX defined Is there any other API for this? Thank you!