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 const char *command; 66 QDict *args, *dict; 67 QmpCommand *cmd; 68 QObject *ret = NULL; 69 70 71 dict = qmp_dispatch_check_obj(request, errp); 72 if (!dict || error_is_set(errp)) { 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_set(errp, QERR_COMMAND_DISABLED, command); 84 return NULL; 85 } 86 87 if (!qdict_haskey(dict, "arguments")) { 88 args = qdict_new(); 89 } else { 90 args = qdict_get_qdict(dict, "arguments"); 91 QINCREF(args); 92 } 93 94 switch (cmd->type) { 95 case QCT_NORMAL: 96 cmd->fn(args, &ret, errp); 97 if (!error_is_set(errp)) { 98 if (cmd->options & QCO_NO_SUCCESS_RESP) { 99 g_assert(!ret); 100 } else if (!ret) { 101 ret = QOBJECT(qdict_new()); 102 } 103 } 104 break; 105 } 106 107 QDECREF(args); 108 109 return ret; 110 } 111 112 QObject *qmp_build_error_object(Error *errp) 113 { 114 return qobject_from_jsonf("{ 'class': %s, 'desc': %s }", 115 ErrorClass_lookup[error_get_class(errp)], 116 error_get_pretty(errp)); 117 } 118 119 QObject *qmp_dispatch(QObject *request) 120 { 121 Error *err = NULL; 122 QObject *ret; 123 QDict *rsp; 124 125 ret = do_qmp_dispatch(request, &err); 126 127 rsp = qdict_new(); 128 if (err) { 129 qdict_put_obj(rsp, "error", qmp_build_error_object(err)); 130 error_free(err); 131 } else if (ret) { 132 qdict_put_obj(rsp, "return", ret); 133 } else { 134 QDECREF(rsp); 135 return NULL; 136 } 137 138 return QOBJECT(rsp); 139 } 140