1 /* 2 * Core Definitions for QAPI/QMP Dispatch 3 * 4 * Copyright IBM, Corp. 2011 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. 10 * See the COPYING.LIB file in the top-level directory. 11 * 12 */ 13 14 #include "qapi/qmp/types.h" 15 #include "qapi/qmp/dispatch.h" 16 #include "qapi/qmp/json-parser.h" 17 #include "qapi-types.h" 18 #include "qapi/error.h" 19 #include "qapi/qmp/qerror.h" 20 21 static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp) 22 { 23 const QDictEntry *ent; 24 const char *arg_name; 25 const QObject *arg_obj; 26 bool has_exec_key = false; 27 QDict *dict = NULL; 28 29 if (qobject_type(request) != QTYPE_QDICT) { 30 error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, 31 "request is not a dictionary"); 32 return NULL; 33 } 34 35 dict = qobject_to_qdict(request); 36 37 for (ent = qdict_first(dict); ent; 38 ent = qdict_next(dict, ent)) { 39 arg_name = qdict_entry_key(ent); 40 arg_obj = qdict_entry_value(ent); 41 42 if (!strcmp(arg_name, "execute")) { 43 if (qobject_type(arg_obj) != QTYPE_QSTRING) { 44 error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "execute", 45 "string"); 46 return NULL; 47 } 48 has_exec_key = true; 49 } else if (strcmp(arg_name, "arguments")) { 50 error_set(errp, QERR_QMP_EXTRA_MEMBER, arg_name); 51 return NULL; 52 } 53 } 54 55 if (!has_exec_key) { 56 error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "execute"); 57 return NULL; 58 } 59 60 return dict; 61 } 62 63 static QObject *do_qmp_dispatch(QObject *request, Error **errp) 64 { 65 Error *local_err = NULL; 66 const char *command; 67 QDict *args, *dict; 68 QmpCommand *cmd; 69 QObject *ret = NULL; 70 71 dict = qmp_dispatch_check_obj(request, errp); 72 if (!dict) { 73 return NULL; 74 } 75 76 command = qdict_get_str(dict, "execute"); 77 cmd = qmp_find_command(command); 78 if (cmd == NULL) { 79 error_set(errp, QERR_COMMAND_NOT_FOUND, command); 80 return NULL; 81 } 82 if (!cmd->enabled) { 83 error_setg(errp, "The command %s has been disabled for this instance", 84 command); 85 return NULL; 86 } 87 88 if (!qdict_haskey(dict, "arguments")) { 89 args = qdict_new(); 90 } else { 91 args = qdict_get_qdict(dict, "arguments"); 92 QINCREF(args); 93 } 94 95 switch (cmd->type) { 96 case QCT_NORMAL: 97 cmd->fn(args, &ret, &local_err); 98 if (local_err) { 99 error_propagate(errp, local_err); 100 } else if (cmd->options & QCO_NO_SUCCESS_RESP) { 101 g_assert(!ret); 102 } else if (!ret) { 103 ret = QOBJECT(qdict_new()); 104 } 105 break; 106 } 107 108 QDECREF(args); 109 110 return ret; 111 } 112 113 QObject *qmp_build_error_object(Error *err) 114 { 115 return qobject_from_jsonf("{ 'class': %s, 'desc': %s }", 116 ErrorClass_lookup[error_get_class(err)], 117 error_get_pretty(err)); 118 } 119 120 QObject *qmp_dispatch(QObject *request) 121 { 122 Error *err = NULL; 123 QObject *ret; 124 QDict *rsp; 125 126 ret = do_qmp_dispatch(request, &err); 127 128 rsp = qdict_new(); 129 if (err) { 130 qdict_put_obj(rsp, "error", qmp_build_error_object(err)); 131 error_free(err); 132 } else if (ret) { 133 qdict_put_obj(rsp, "return", ret); 134 } else { 135 QDECREF(rsp); 136 return NULL; 137 } 138 139 return QOBJECT(rsp); 140 } 141