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Re: [libvirt] [PATCH 3/4] remote: Print ssh stderr on connection failure



On 02/18/2010 09:44 AM, Daniel P. Berrange wrote:
> On Fri, Feb 12, 2010 at 10:32:16AM -0500, Cole Robinson wrote:
>> ---
>>  src/remote/remote_driver.c |   37 ++++++++++++++++++++++++++++++++++---
>>  1 files changed, 34 insertions(+), 3 deletions(-)
>>
>> diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
>> index 13534ce..7f92fd0 100644
>> --- a/src/remote/remote_driver.c
>> +++ b/src/remote/remote_driver.c
>> @@ -154,6 +154,7 @@ struct private_data {
>>      virMutex lock;
>>  
>>      int sock;                   /* Socket. */
>> +    int errsock;                /* Socket connected to remote stderr */
>>      int watch;                  /* File handle watch */
>>      pid_t pid;                  /* PID of tunnel process */
>>      int uses_tls;               /* TLS enabled on socket? */
>> @@ -783,6 +784,7 @@ doRemoteOpen (virConnectPtr conn,
>>      case trans_ext: {
>>          pid_t pid;
>>          int sv[2];
>> +        int errsock[2];
>>  
>>          /* Fork off the external process.  Use socketpair to create a private
>>           * (unnamed) Unix domain socket to the child process so we don't have
>> @@ -794,14 +796,21 @@ doRemoteOpen (virConnectPtr conn,
>>              goto failed;
>>          }
>>  
>> +        if (socketpair (PF_UNIX, SOCK_STREAM, 0, errsock) == -1) {
>> +            virReportSystemError(errno, "%s",
>> +                                 _("unable to create socket pair"));
>> +            goto failed;
>> +        }
> 
> I think you just want pipe() here, since this does not want to
> be a bi-directional channel.
> 
>> +
>>          if (virExec((const char**)cmd_argv, NULL, NULL,
>> -                    &pid, sv[1], &(sv[1]), NULL,
>> +                    &pid, sv[1], &(sv[1]), &(errsock[1]),
>>                      VIR_EXEC_CLEAR_CAPS) < 0)
>>              goto failed;
>>  
>>          /* Parent continues here. */
>>          close (sv[1]);
>>          priv->sock = sv[0];
>> +        priv->errsock = errsock[0];
>>          priv->pid = pid;
>>  
>>          /* Do not set 'is_secure' flag since we can't guarentee
>> @@ -827,6 +836,12 @@ doRemoteOpen (virConnectPtr conn,
>>          goto failed;
>>      }
>>  
>> +    if ((priv->errsock != -1) && virSetNonBlock(priv->errsock) < 0) {
>> +        virReportSystemError(errno, "%s",
>> +                             _("unable to make socket non-blocking"));
>> +        goto failed;
>> +    }
>> +
>>      if (pipe(wakeupFD) < 0) {
>>          virReportSystemError(errno, "%s",
>>                               _("unable to make pipe"));
>> @@ -939,6 +954,9 @@ doRemoteOpen (virConnectPtr conn,
>>  
>>   failed:
>>      /* Close the socket if we failed. */
>> +    if (priv->errsock >= 0)
>> +        close(priv->errsock);
>> +
>>      if (priv->sock >= 0) {
>>          if (priv->uses_tls && priv->session) {
>>              gnutls_bye (priv->session, GNUTLS_SHUT_RDWR);
>> @@ -986,6 +1004,7 @@ remoteAllocPrivateData(virConnectPtr conn)
>>      priv->localUses = 1;
>>      priv->watch = -1;
>>      priv->sock = -1;
>> +    priv->errsock = -1;
>>  
>>      return priv;
>>  }
>> @@ -1408,6 +1427,7 @@ doRemoteClose (virConnectPtr conn, struct private_data *priv)
>>          sasl_dispose (&priv->saslconn);
>>  #endif
>>      close (priv->sock);
>> +    close (priv->errsock);
>>  
>>  #ifndef WIN32
>>      if (priv->pid > 0) {
>> @@ -7785,12 +7805,23 @@ remoteIOReadBuffer(virConnectPtr conn,
>>                  if (errno == EWOULDBLOCK)
>>                      return 0;
>>  
>> +                char errout[1024] = "\0";
>> +                if (priv->errsock) {
> 
> Should be   priv->errsock != -1
> 
>> +                    recv(priv->errsock, errout, sizeof(errout), 0);
>> +                }
>> +
>>                  virReportSystemError(errno,
>> -                                     "%s", _("cannot recv data"));
>> +                                     _("cannot recv data: %s"), errout);
>> +
>>              } else {
>> +                char errout[1024] = "\0";
>> +                if (priv->errsock) {
> 
> Likewise here
> 
>> +                    recv(priv->errsock, errout, sizeof(errout), 0);
>> +                }
>> +
>>                  errorf (in_open ? NULL : conn,
>>                          VIR_ERR_SYSTEM_ERROR,
>> -                        "%s", _("server closed connection"));
>> +                        _("server closed connection: %s"), errout);
>>              }
>>              return -1;
>>          }
>> -- 
> 
> 
> Daniel

Thanks, I've sent an updated version.

- Cole


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