How to get local IP

[Kael]

Hi,all

My environment is win7 64.

SDK version pepper_49.

TOOCHAIN=glibc NACL_ARCH=x86_64

I run chrome with the --enable-nacl --no-sandbox --allow-nacl-socket-api=host flags. 

I tried some ways to get local IP but failed.

Question 1:

Dose nacl support gethostname ?

I tried this to get local IP, and i got this warning during compiling:

warning:gethostname isnotimplemented and will always fail.

Question 2:

I tried ioctl to get local IP:

int sockfd;

struct ifconf ifcnfig;

char buffer[4000];

ifcnfig.ifc_len = sizeof(buffer);

ifcnfig.ifc_buf = buffer;

if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0）

{

  fprintf(stderr, "socket failed, fd=%d.\r\n", sockfd);

}

if (ioctl(sockfd, SIOCGIFCONF， &ifcnfig) < 0)

{

  fprintf(stderr, "ioctl:%s'n", strerror(errno));

  close(sockfd);

  return;

}

When i ran it in chrome, i got this error:

ioctl:Invalid argument

How can i solve this problem?

Question 3:

Can i get local IP through another way？

Thanks

[Ben Smith]

Hi Kael,

I don't think this is exposed via nacl_io. But you can get a list of network adapters using the NetworkList API. Take a look at the network monitor example in the SDK, at examples/api/network_monitor.

-Ben

[Kael]

Hi Ben,

I get the list of network adapters successfully in main thread using NetworkList API.

But I failed to get it in a second thread:

Attempted to use a required callback, but there is no attached message loop on which to run the callback.

Then, I tried to UpdateNetworkList with a Blocking CompletionCallBackWithOutput in a background thread.

I got this err : UpdateNetworkLis failed: -4

Can i UpdateNetworkList with a Blocking CallBack?

Can you help me to find out the invalid argument?

Looking forward to your reply.

@code

Class XXXInstance : public pp::Instance()

{

  public:

    explicit XXXInstance(PP_Instance instance)

      : pp::instance(instance)

      , m_callBack(m_storageType)

      , m_networkMonitor(this){}

    void update();

  private:

     pp::internal::CallbackOutputTraits<pp::NetworkList>::StorageType *m_storageType;

     pp::CompletionCallBackWithOutput<pp::NetworkList> m_callBack;

     pp::NetworkMonitor m_networkMonitor;

 };

void update()

{

  int32_t result = m_networkMonitor.UpdateNetworkList(m_callBack);

  if (result != PP_OK_COMPLETIONPENDING)

  {

    std::ostringstream status;

    status<< "UpdateNetworkLis failed: "<< result;

    PostMessage(status.str());

  }

}

@endcode

Thanks

在 2016年4月19日星期二 UTC+8上午5:23:25，Ben Smith写道：

[Bill Budge]

I'm not sure why you're getting a PP_ERROR_BADARGUMENT but you must have a message loop to run asynchronous callbacks on your own thread.

This link explains how to create the message loop:

https://developer.chrome.com/native-client/pepper_dev/cpp/classpp_1_1_message_loop