/* * Core Definitions for QAPI/QMP Dispatch * * Copyright IBM, Corp. 2011 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. * See the COPYING.LIB file in the top-level directory. * */ #include "qapi/qmp/types.h" #include "qapi/qmp/dispatch.h" #include "qapi/qmp/json-parser.h" #include "qapi-types.h" #include "qapi/error.h" #include "qapi/qmp/qerror.h" static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp) { const QDictEntry *ent; const char *arg_name; const QObject *arg_obj; bool has_exec_key = false; QDict *dict = NULL; if (qobject_type(request) != QTYPE_QDICT) { error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "request is not a dictionary"); return NULL; } dict = qobject_to_qdict(request); for (ent = qdict_first(dict); ent; ent = qdict_next(dict, ent)) { arg_name = qdict_entry_key(ent); arg_obj = qdict_entry_value(ent); if (!strcmp(arg_name, "execute")) { if (qobject_type(arg_obj) != QTYPE_QSTRING) { error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "execute", "string"); return NULL; } has_exec_key = true; } else if (strcmp(arg_name, "arguments")) { error_set(errp, QERR_QMP_EXTRA_MEMBER, arg_name); return NULL; } } if (!has_exec_key) { error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "execute"); return NULL; } return dict; } static QObject *do_qmp_dispatch(QObject *request, Error **errp) { Error *local_err = NULL; const char *command; QDict *args, *dict; QmpCommand *cmd; QObject *ret = NULL; dict = qmp_dispatch_check_obj(request, errp); if (!dict) { return NULL; } command = qdict_get_str(dict, "execute"); cmd = qmp_find_command(command); if (cmd == NULL) { error_set(errp, QERR_COMMAND_NOT_FOUND, command); return NULL; } if (!cmd->enabled) { error_setg(errp, "The command %s has been disabled for this instance", command); return NULL; } if (!qdict_haskey(dict, "arguments")) { args = qdict_new(); } else { args = qdict_get_qdict(dict, "arguments"); QINCREF(args); } switch (cmd->type) { case QCT_NORMAL: cmd->fn(args, &ret, &local_err); if (local_err) { error_propagate(errp, local_err); } else if (cmd->options & QCO_NO_SUCCESS_RESP) { g_assert(!ret); } else if (!ret) { ret = QOBJECT(qdict_new()); } break; } QDECREF(args); return ret; } QObject *qmp_build_error_object(Error *err) { return qobject_from_jsonf("{ 'class': %s, 'desc': %s }", ErrorClass_lookup[error_get_class(err)], error_get_pretty(err)); } QObject *qmp_dispatch(QObject *request) { Error *err = NULL; QObject *ret; QDict *rsp; ret = do_qmp_dispatch(request, &err); rsp = qdict_new(); if (err) { qdict_put_obj(rsp, "error", qmp_build_error_object(err)); error_free(err); } else if (ret) { qdict_put_obj(rsp, "return", ret); } else { QDECREF(rsp); return NULL; } return QOBJECT(rsp); }