Re: [RFC PATCH v4 10/11] qemu-sockets: introduce socket_uri()

[Laurent Vivier <lvivier@redhat.com>]

On 29/06/2022 13:26, Markus Armbruster wrote:
> Laurent Vivier <lvivier@redhat.com> writes:
> 
>> Format a string URI from a SocketAddress.
>>
>> Original code from hmp-cmds.c:SocketAddress_to_str()
>>
>> Replace 'tcp:' by 'inet:' (because 'inet' can be also 'udp').
> 
> This one's merely misleading.
> 
>> Replace 'tcp:' by 'vsock:' with vsock socket type.
> 
> This one's positively wrong: it makes a vsock address look like an inet
> address with CID misinterpreted as host.  Goes back to commit 9aca82ba31
> "migration: Create socket-address parameter"
> 
>> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
>> ---
>>   include/qemu/sockets.h |  2 +-
>>   monitor/hmp-cmds.c     | 23 +----------------------
>>   util/qemu-sockets.c    | 20 ++++++++++++++++++++
>>   3 files changed, 22 insertions(+), 23 deletions(-)
>>
>> diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
>> index 47194b9732f8..3e2ae7e21705 100644
>> --- a/include/qemu/sockets.h
>> +++ b/include/qemu/sockets.h
>> @@ -41,6 +41,7 @@ int unix_listen(const char *path, Error **errp);
>>   int unix_connect(const char *path, Error **errp);
>>   
>>   SocketAddress *socket_parse(const char *str, Error **errp);
>> +char *socket_uri(SocketAddress *addr);
>>   int socket_connect(SocketAddress *addr, Error **errp);
>>   int socket_listen(SocketAddress *addr, int num, Error **errp);
>>   void socket_listen_cleanup(int fd, Error **errp);
>> @@ -123,5 +124,4 @@ SocketAddress *socket_address_flatten(SocketAddressLegacy *addr);
>>    * Return 0 on success.
>>    */
>>   int socket_address_parse_named_fd(SocketAddress *addr, Error **errp);
>> -
>>   #endif /* QEMU_SOCKETS_H */
>> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
>> index 47a27326eef7..eb0fe0a293b8 100644
>> --- a/monitor/hmp-cmds.c
>> +++ b/monitor/hmp-cmds.c
>> @@ -197,27 +197,6 @@ void hmp_info_mice(Monitor *mon, const QDict *qdict)
>>       qapi_free_MouseInfoList(mice_list);
>>   }
>>   
>> -static char *SocketAddress_to_str(SocketAddress *addr)
>> -{
>> -    switch (addr->type) {
>> -    case SOCKET_ADDRESS_TYPE_INET:
>> -        return g_strdup_printf("tcp:%s:%s",
>> -                               addr->u.inet.host,
>> -                               addr->u.inet.port);
>> -    case SOCKET_ADDRESS_TYPE_UNIX:
>> -        return g_strdup_printf("unix:%s",
>> -                               addr->u.q_unix.path);
>> -    case SOCKET_ADDRESS_TYPE_FD:
>> -        return g_strdup_printf("fd:%s", addr->u.fd.str);
>> -    case SOCKET_ADDRESS_TYPE_VSOCK:
>> -        return g_strdup_printf("tcp:%s:%s",
>> -                               addr->u.vsock.cid,
>> -                               addr->u.vsock.port);
>> -    default:
>> -        return g_strdup("unknown address type");
>> -    }
>> -}
>> -
>>   void hmp_info_migrate(Monitor *mon, const QDict *qdict)
>>   {
>>       MigrationInfo *info;
>> @@ -375,7 +354,7 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
>>           monitor_printf(mon, "socket address: [\n");
>>   
>>           for (addr = info->socket_address; addr; addr = addr->next) {
>> -            char *s = SocketAddress_to_str(addr->value);
>> +            char *s = socket_uri(addr->value);
>>               monitor_printf(mon, "\t%s\n", s);
>>               g_free(s);
>>           }
>> diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
>> index 13b5b197f9ea..4efc2ce8b074 100644
>> --- a/util/qemu-sockets.c
>> +++ b/util/qemu-sockets.c
>> @@ -1098,6 +1098,26 @@ int unix_connect(const char *path, Error **errp)
>>       return sock;
>>   }
>>   
>> +char *socket_uri(SocketAddress *addr)
>> +{
>> +    switch (addr->type) {
>> +    case SOCKET_ADDRESS_TYPE_INET:
>> +        return g_strdup_printf("inet:%s:%s",
>> +                               addr->u.inet.host,
>> +                               addr->u.inet.port);
>> +    case SOCKET_ADDRESS_TYPE_UNIX:
>> +        return g_strdup_printf("unix:%s",
>> +                               addr->u.q_unix.path);
>> +    case SOCKET_ADDRESS_TYPE_FD:
>> +        return g_strdup_printf("fd:%s", addr->u.fd.str);
>> +    case SOCKET_ADDRESS_TYPE_VSOCK:
>> +        return g_strdup_printf("vsock:%s:%s",
>> +                               addr->u.vsock.cid,
>> +                               addr->u.vsock.port);
>> +    default:
>> +        return g_strdup("unknown address type");
>> +    }
>> +}
>>   
>>   SocketAddress *socket_parse(const char *str, Error **errp)
>>   {
> 
> Why do you move and rename?  I'm not objecting, I just want to know the
> reason :)

I missed your comment before sending the v5.

I move and rename because this function is the counterpart for socket_parse(), so make the 
name similar and put the function in the same place.

Perhaps it should also be improved to display all the options ("keep-alive", "mptcp", ...) 
that socket_parse() is able to decode?

Thanks,
Laurent