monitor/qmp-cmds-control.c

   1 /*
   2  * QMP commands related to the monitor (common to sysemu and tools)
   3  *
   4  * Copyright (c) 2003-2004 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26
  27 #include "monitor-internal.h"
  28 #include "qemu-version.h"
  29 #include "qapi/error.h"
  30 #include "qapi/qapi-commands-control.h"
  31 #include "qapi/qapi-emit-events.h"
  32 #include "qapi/qapi-introspect.h"
  33
  34 /*
  35  * Accept QMP capabilities in @list for @mon.
  36  * On success, set mon->qmp.capab[], and return true.
  37  * On error, set @errp, and return false.
  38  */
  39 static bool qmp_caps_accept(MonitorQMP *mon, QMPCapabilityList *list,
  40                             Error **errp)
  41 {
  42     GString *unavailable = NULL;
  43     bool capab[QMP_CAPABILITY__MAX];
  44
  45     memset(capab, 0, sizeof(capab));
  46
  47     for (; list; list = list->next) {
  48         if (!mon->capab_offered[list->value]) {
  49             if (!unavailable) {
  50                 unavailable = g_string_new(QMPCapability_str(list->value));
  51             } else {
  52                 g_string_append_printf(unavailable, ", %s",
  53                                       QMPCapability_str(list->value));
  54             }
  55         }
  56         capab[list->value] = true;
  57     }
  58
  59     if (unavailable) {
  60         error_setg(errp, "Capability %s not available", unavailable->str);
  61         g_string_free(unavailable, true);
  62         return false;
  63     }
  64
  65     memcpy(mon->capab, capab, sizeof(capab));
  66     return true;
  67 }
  68
  69 void qmp_qmp_capabilities(bool has_enable, QMPCapabilityList *enable,
  70                           Error **errp)
  71 {
  72     Monitor *cur_mon = monitor_cur();
  73     MonitorQMP *mon;
  74
  75     assert(monitor_is_qmp(cur_mon));
  76     mon = container_of(cur_mon, MonitorQMP, common);
  77
  78     if (mon->commands == &qmp_commands) {
  79         error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
  80                   "Capabilities negotiation is already complete, command "
  81                   "ignored");
  82         return;
  83     }
  84
  85     if (!qmp_caps_accept(mon, enable, errp)) {
  86         return;
  87     }
  88
  89     mon->commands = &qmp_commands;
  90 }
  91
  92 VersionInfo *qmp_query_version(Error **errp)
  93 {
  94     VersionInfo *info = g_new0(VersionInfo, 1);
  95
  96     info->qemu = g_new0(VersionTriple, 1);
  97     info->qemu->major = QEMU_VERSION_MAJOR;
  98     info->qemu->minor = QEMU_VERSION_MINOR;
  99     info->qemu->micro = QEMU_VERSION_MICRO;
 100     info->package = g_strdup(QEMU_PKGVERSION);
 101
 102     return info;
 103 }
 104
 105 static void query_commands_cb(const QmpCommand *cmd, void *opaque)
 106 {
 107     CommandInfo *info;
 108     CommandInfoList **list = opaque;
 109
 110     if (!cmd->enabled) {
 111         return;
 112     }
 113
 114     info = g_malloc0(sizeof(*info));
 115     info->name = g_strdup(cmd->name);
 116     QAPI_LIST_PREPEND(*list, info);
 117 }
 118
 119 CommandInfoList *qmp_query_commands(Error **errp)
 120 {
 121     CommandInfoList *list = NULL;
 122     Monitor *cur_mon = monitor_cur();
 123     MonitorQMP *mon;
 124
 125     assert(monitor_is_qmp(cur_mon));
 126     mon = container_of(cur_mon, MonitorQMP, common);
 127
 128     qmp_for_each_command(mon->commands, query_commands_cb, &list);
 129
 130     return list;
 131 }
 132
 133 /*
 134  * Minor hack: generated marshalling suppressed for this command
 135  * ('gen': false in the schema) so we can parse the JSON string
 136  * directly into QObject instead of first parsing it with
 137  * visit_type_SchemaInfoList() into a SchemaInfoList, then marshal it
 138  * to QObject with generated output marshallers, every time.  Instead,
 139  * we do it in test-qobject-input-visitor.c, just to make sure
 140  * qapi-gen.py's output actually conforms to the schema.
 141  */
 142 void qmp_query_qmp_schema(QDict *qdict, QObject **ret_data,
 143                                  Error **errp)
 144 {
 145     *ret_data = qobject_from_qlit(&qmp_schema_qlit);
 146 }