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Re: [PULL V2 3/6] hmp-commands: Add new HMP command for filter passthrou


From: Dr. David Alan Gilbert
Subject: Re: [PULL V2 3/6] hmp-commands: Add new HMP command for filter passthrough
Date: Wed, 14 Jul 2021 19:47:52 +0100
User-agent: Mutt/2.0.7 (2021-05-04)

* Zhang Chen (chen.zhang@intel.com) wrote:
> Add hmp_passthrough_filter_add and hmp_passthrough_filter_del make user
> can maintain object network passthrough list in human monitor
> 
> Signed-off-by: Zhang Chen <chen.zhang@intel.com>
> ---
>  hmp-commands.hx       | 26 +++++++++++++++++
>  include/monitor/hmp.h |  2 ++
>  monitor/hmp-cmds.c    | 67 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 95 insertions(+)
> 
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 8e45bce2cd..426a7d6cda 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1292,6 +1292,32 @@ SRST
>    Remove host network device.
>  ERST
>  
> +    {
> +        .name       = "passthrough_filter_add",
> +        .args_type  = "protocol:s?,object-name:s,src:s?,dst:s?",
> +        .params     = "[protocol] object-name [src] [dst]",
> +        .help       = "Add network passthrough rule to object passthrough 
> list",
> +        .cmd        = hmp_passthrough_filter_add,
> +    },
> +
> +SRST
> +``passthrough_filter_add``
> +  Add network stream to object passthrough list.
> +ERST
> +
> +    {
> +        .name       = "passthrough_filter_del",
> +        .args_type  = "protocol:s?,object-name:s,src:s?,dst:s?",
> +        .params     = "[protocol] object-name [src] [dst]",
> +        .help       = "Delete network passthrough rule from object 
> passthrough list",
> +        .cmd        = hmp_passthrough_filter_del,
> +    },
> +
> +SRST
> +``passthrough_filter_del``
> +  Delete network stream from object passthrough list.
> +ERST
> +
>      {
>          .name       = "object_add",
>          .args_type  = "object:S",
> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
> index 3baa1058e2..ba6987e552 100644
> --- a/include/monitor/hmp.h
> +++ b/include/monitor/hmp.h
> @@ -77,6 +77,8 @@ void hmp_device_del(Monitor *mon, const QDict *qdict);
>  void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict);
>  void hmp_netdev_add(Monitor *mon, const QDict *qdict);
>  void hmp_netdev_del(Monitor *mon, const QDict *qdict);
> +void hmp_passthrough_filter_add(Monitor *mon, const QDict *qdict);
> +void hmp_passthrough_filter_del(Monitor *mon, const QDict *qdict);
>  void hmp_getfd(Monitor *mon, const QDict *qdict);
>  void hmp_closefd(Monitor *mon, const QDict *qdict);
>  void hmp_sendkey(Monitor *mon, const QDict *qdict);
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index 0942027208..b47a2e4850 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -1638,6 +1638,73 @@ void hmp_netdev_del(Monitor *mon, const QDict *qdict)
>      hmp_handle_error(mon, err);
>  }
>  
> +IPFlowSpec *hmp_parse_IPFlowSpec(Monitor *mon, const QDict *qdict)
> +{
> +    IPFlowSpec *spec = g_new0(IPFlowSpec, 1);
> +    char *src, *dst;
> +
> +    spec->protocol = g_strdup(qdict_get_try_str(qdict, "protocol"));
> +    spec->object_name = g_strdup(qdict_get_try_str(qdict, "object-name"));
> +    src = g_strdup(qdict_get_try_str(qdict, "src"));
> +    dst = g_strdup(qdict_get_try_str(qdict, "dst"));
> +
> +    if (src) {
> +        spec->source = g_new0(InetSocketAddressBase, 1);
> +
> +        if (inet_parse_base(spec->source, src, NULL)) {
> +            monitor_printf(mon, "Incorrect passthrough src address\n");
> +            g_free(spec->source);
> +            g_free(src);
> +            goto err;

That leaks dst if dst is set.

> +        }
> +        g_free(src);
> +    }
> +
> +    if (dst) {
> +        spec->destination = g_new0(InetSocketAddressBase, 1);
> +
> +        if (inet_parse_base(spec->destination, dst, NULL)) {
> +            monitor_printf(mon, "Incorrect passthrough dst address\n");
> +            g_free(spec->destination);
> +            g_free(dst);

That leaks src, and spec->source

Perhaps the easiest thing would be:
  g_autofree *src = NULL;
  g_autofree *dst = NULL;

and then they'll get free'd up automatically.
Then in err:  you can do a g_free() of spec->source and
spec->destination and finally spec.

Dave

> +            goto err;
> +        }
> +        g_free(dst);
> +    }
> +
> +    return spec;
> +
> +err:
> +    g_free(spec);
> +    return NULL;
> +}
> +
> +void hmp_passthrough_filter_add(Monitor *mon, const QDict *qdict)
> +{
> +    IPFlowSpec *spec;
> +    Error *err = NULL;
> +
> +    spec = hmp_parse_IPFlowSpec(mon, qdict);
> +    if (spec) {
> +        qmp_passthrough_filter_add(spec, &err);
> +    }
> +
> +    hmp_handle_error(mon, err);
> +}
> +
> +void hmp_passthrough_filter_del(Monitor *mon, const QDict *qdict)
> +{
> +    IPFlowSpec *spec;
> +    Error *err = NULL;
> +
> +    spec = hmp_parse_IPFlowSpec(mon, qdict);
> +    if (spec) {
> +        qmp_passthrough_filter_del(spec, &err);
> +    }
> +
> +    hmp_handle_error(mon, err);
> +}
> +
>  void hmp_object_add(Monitor *mon, const QDict *qdict)
>  {
>      const char *options = qdict_get_str(qdict, "object");
> -- 
> 2.25.1
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK




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