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     MonitorQMP *mon;
  73
  74     assert(monitor_is_qmp(cur_mon));
  75     mon = container_of(cur_mon, MonitorQMP, common);
  76
  77     if (mon->commands == &qmp_commands) {
  78         error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
  79                   "Capabilities negotiation is already complete, command "
  80                   "ignored");
  81         return;
  82     }
  83
  84     if (!qmp_caps_accept(mon, enable, errp)) {
  85         return;
  86     }
  87
  88     mon->commands = &qmp_commands;
  89 }
  90
  91 VersionInfo *qmp_query_version(Error **errp)
  92 {
  93     VersionInfo *info = g_new0(VersionInfo, 1);
  94
  95     info->qemu = g_new0(VersionTriple, 1);
  96     info->qemu->major = QEMU_VERSION_MAJOR;
  97     info->qemu->minor = QEMU_VERSION_MINOR;
  98     info->qemu->micro = QEMU_VERSION_MICRO;
  99     info->package = g_strdup(QEMU_PKGVERSION);
 100
 101     return info;
 102 }
 103
 104 static void query_commands_cb(const QmpCommand *cmd, void *opaque)
 105 {
 106     CommandInfoList *info, **list = opaque;
 107
 108     if (!cmd->enabled) {
 109         return;
 110     }
 111
 112     info = g_malloc0(sizeof(*info));
 113     info->value = g_malloc0(sizeof(*info->value));
 114     info->value->name = g_strdup(cmd->name);
 115     info->next = *list;
 116     *list = info;
 117 }
 118
 119 CommandInfoList *qmp_query_commands(Error **errp)
 120 {
 121     CommandInfoList *list = NULL;
 122     MonitorQMP *mon;
 123
 124     assert(monitor_is_qmp(cur_mon));
 125     mon = container_of(cur_mon, MonitorQMP, common);
 126
 127     qmp_for_each_command(mon->commands, query_commands_cb, &list);
 128
 129     return list;
 130 }
 131
 132 EventInfoList *qmp_query_events(Error **errp)
 133 {
 134     /*
 135      * TODO This deprecated command is the only user of
 136      * QAPIEvent_str() and QAPIEvent_lookup[].  When the command goes,
 137      * they should go, too.
 138      */
 139     EventInfoList *info, *ev_list = NULL;
 140     QAPIEvent e;
 141
 142     for (e = 0 ; e < QAPI_EVENT__MAX ; e++) {
 143         const char *event_name = QAPIEvent_str(e);
 144         assert(event_name != NULL);
 145         info = g_malloc0(sizeof(*info));
 146         info->value = g_malloc0(sizeof(*info->value));
 147         info->value->name = g_strdup(event_name);
 148
 149         info->next = ev_list;
 150         ev_list = info;
 151     }
 152
 153     return ev_list;
 154 }
 155
 156 /*
 157  * Minor hack: generated marshalling suppressed for this command
 158  * ('gen': false in the schema) so we can parse the JSON string
 159  * directly into QObject instead of first parsing it with
 160  * visit_type_SchemaInfoList() into a SchemaInfoList, then marshal it
 161  * to QObject with generated output marshallers, every time.  Instead,
 162  * we do it in test-qobject-input-visitor.c, just to make sure
 163  * qapi-gen.py's output actually conforms to the schema.
 164  */
 165 void qmp_query_qmp_schema(QDict *qdict, QObject **ret_data,
 166                                  Error **errp)
 167 {
 168     *ret_data = qobject_from_qlit(&qmp_schema_qlit);
 169 }