Re: [Qemu-devel] [PATCH v2 03/16] sockets: allow port to be NULL when listening on IP address

[Shannon Zhao <zhaoshenglong@huawei.com>]

On 2015/10/22 1:52, Knut Omang wrote:
> On Mon, 2015-10-12 at 12:14 +0100, Daniel P. Berrange wrote:
>> If the port in the SocketAddress struct is NULL, it can allow
>> the kernel to automatically select a free port. This is useful
>> in particular in unit tests to avoid a race trying to find a
>> free port to run a test case on.
> 
> This patch seems to do a bit more than it claims ;-)
> 
> I just noticed that after a rebase a few minutes ago, all options I
> have that uses this type of port syntax:
> 
> -serial telnet:ip:port
> -serial tcp:ip:port
> -qmp ip:port
> 
And -monitor telnet::4444,server,nowait makes QEMU exit.

So do we decide how to fix this?

> started to ignore the port argument and instead provide a dynamic port.
> Rebasing without this patch fixes the issue,
> 
> Thanks,
> Knut
> 
>>
>> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
>> ---
>>  util/qemu-sockets.c | 18 +++++++++++++-----
>>  1 file changed, 13 insertions(+), 5 deletions(-)
>>
>> diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
>> index 9cc5bee..f9d2f6e 100644
>> --- a/util/qemu-sockets.c
>> +++ b/util/qemu-sockets.c
>> @@ -128,12 +128,15 @@ int inet_listen_opts(QemuOpts *opts, int
>> port_offset, Error **errp)
>>      ai.ai_family = PF_UNSPEC;
>>      ai.ai_socktype = SOCK_STREAM;
>>  
>> -    if ((qemu_opt_get(opts, "host") == NULL) ||
>> -        (qemu_opt_get(opts, "port") == NULL)) {
>> -        error_setg(errp, "host and/or port not specified");
>> +    if ((qemu_opt_get(opts, "host") == NULL)) {
>> +        error_setg(errp, "host not specified");
>>          return -1;
>>      }
>> -    pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
>> +    if (qemu_opt_get(opts, "port") != NULL) {
>> +        pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
>> +    } else {
>> +        port[0] = '\0';
>> +    }
>>      addr = qemu_opt_get(opts, "host");
>>  
>>      to = qemu_opt_get_number(opts, "to", 0);
>> @@ -145,6 +148,10 @@ int inet_listen_opts(QemuOpts *opts, int
>> port_offset, Error **errp)
>>      /* lookup */
>>      if (port_offset) {
>>          unsigned long long baseport;
>> +        if (strlen(port) == 0) {
>> +            error_setg(errp, "port not specified");
>> +            return -1;
>> +        }
>>          if (parse_uint_full(port, &baseport, 10) < 0) {
>>              error_setg(errp, "can't convert to a number: %s", port);
>>              return -1;
>> @@ -156,7 +163,8 @@ int inet_listen_opts(QemuOpts *opts, int
>> port_offset, Error **errp)
>>          }
>>          snprintf(port, sizeof(port), "%d", (int)baseport +
>> port_offset);
>>      }
>> -    rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
>> +    rc = getaddrinfo(strlen(addr) ? addr : NULL,
>> +                     strlen(port) ? port : NULL, &ai, &res);
>>      if (rc != 0) {
>>          error_setg(errp, "address resolution failed for %s:%s: %s",
>> addr, port,
>>                     gai_strerror(rc));
> 
> 
> 

-- 
Shannon