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QMP: Enforce capability negotiation rules

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With this commit QMP will be started in Capabilities Negotiation
mode, where the only command allowed to run is 'qmp_capabilities'.

All other commands will return CommandNotFound error. Asynchronous
messages are not delivered either.

When 'qmp_capabilities' is successfully executed QMP enters in
Command mode, where all commands (except 'qmp_capabilities') are
allowed to run and asynchronous messages are delivered.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Luiz Capitulino 2010-02-04 18:10:06 -02:00 committed by Anthony Liguori
parent 4a7e1190df
commit 09069b19f4
1 changed files with 17 additions and 1 deletions
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18
monitor.c
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@ -153,6 +153,11 @@ Monitor *cur_mon = NULL;
static void monitor_command_cb(Monitor *mon, const char *cmdline,
void *opaque);
static inline int qmp_cmd_mode(const Monitor *mon)
{
return (mon->mc ? mon->mc->command_mode : 0);
}
/* Return true if in control mode, false otherwise */
static inline int monitor_ctrl_mode(const Monitor *mon)
{
@ -406,7 +411,7 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
}
QLIST_FOREACH(mon, &mon_list, entry) {
if (monitor_ctrl_mode(mon)) {
if (monitor_ctrl_mode(mon) && qmp_cmd_mode(mon)) {
monitor_json_emitter(mon, QOBJECT(qmp));
}
}
@ -4232,6 +4237,12 @@ static int monitor_check_qmp_args(const mon_cmd_t *cmd, QDict *args)
return err;
}
static int invalid_qmp_mode(const Monitor *mon, const char *cmd_name)
{
int is_cap = compare_cmd(cmd_name, "qmp_capabilities");
return (qmp_cmd_mode(mon) ? is_cap : !is_cap);
}
static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
{
int err;
@ -4271,6 +4282,11 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
cmd_name = qstring_get_str(qobject_to_qstring(obj));
if (invalid_qmp_mode(mon, cmd_name)) {
qemu_error_new(QERR_COMMAND_NOT_FOUND, cmd_name);
goto err_input;
}
/*
* XXX: We need this special case until we get info handlers
* converted into 'query-' commands