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[libvirt-users] Using unix-type channel ....



Hi,

 

I’m trying to use unix-type channel to send/receive datas between host and guest .

 

Here are the steps I follow :

 

1) Adding these lines to expose a channel unix type to my guest

 <channel type='unix'>

      <source mode='bind' path='/var/lib/libvirt/qemu/omnivision_1.agent'/>

      <target type='virtio' name='org.qemu.guest_agent.0'/>

      <alias name='channel0'/>

      <address type='virtio-serial' controller='0' bus='0' port='2'/>

    </channel>

 

 

2) the VM_Orion-1 Guest, exposing a channel "unix" omnivision_1.agent  is started, then netstat shows these new things :

 

netstat -apn | grep qemu

unix  2      [ ACC ]     STREAM     LISTENING     37214  19124/qemu-kvm      /var/lib/libvirt/qemu/VM_Orion-1.monitor

unix  2      [ ACC ]     STREAM     LISTENING     37219  19124/qemu-kvm      /var/lib/libvirt/qemu/omnivision_1.agent

unix  3      [ ]         STREAM     CONNECTED     37242  19124/qemu-kvm      /var/lib/libvirt/qemu/omnivision_1.agent

unix  3      [ ]         STREAM     CONNECTED     37240  19124/qemu-kvm      /var/lib/libvirt/qemu/VM_Orion-1.monitor

 

3) I start  , on the host , a simple test in order to send datas to the guest:

 

.....

     sock = socket(AF_UNIX, SOCK_STREAM, 0);

     if (sock < 0) {

         perror("opening stream socket");

         return(1);

     }

     server.sun_family = AF_UNIX;

     strcpy(server.sun_path, argv[1]);

 

     printf("connecting to socket number : %d \n",sock);

     fflush(stdout);

 

     if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {

         close(sock);

         perror("connecting stream socket");

         return(1);

     }

     printf("writing data on stream socket");

     if (write(sock, DATA, sizeof(DATA)) < 0)

         perror("writing on stream socket");

     close(sock);

.....

 

4) invoking  > test "/var/lib/libvirt/qemu/omnivision_1.agent"

 

then I got  :

 

connecting to socket number : 3

writing data on stream socket

 

and following netstat result :

 

netstat -apn | grep qemu

unix  2      [ ACC ]     STREAM     LISTENING     39348  20587/qemu-kvm      /var/lib/libvirt/qemu/VM_Orion-1.monitor

unix  2      [ ACC ]     STREAM     LISTENING     39353  20587/qemu-kvm      /var/lib/libvirt/qemu/omnivision_1.agent

unix  2      [ ]         STREAM     CONNECTING    0      -                   /var/lib/libvirt/qemu/omnivision_1.agent

unix  3      [ ]         STREAM     CONNECTED     39375  20587/qemu-kvm      /var/lib/libvirt/qemu/omnivision_1.agent

unix  3      [ ]         STREAM     CONNECTED     39373  20587/qemu-kvm      /var/lib/libvirt/qemu/VM_Orion-1.monitor

 

 

 

5) if I try to re-invoke test "/var/lib/libvirt/qemu/omnivision_1.agent"  then :

 

netstat -apn | grep qemu

tcp        0      0 127.0.0.1:5902              0.0.0.0:*                   LISTEN      20587/qemu-kvm

tcp        0      0 127.0.0.1:5902              127.0.0.1:57772             ESTABLISHED 20587/qemu-kvm

unix  2      [ ACC ]     STREAM     LISTENING     39348  20587/qemu-kvm      /var/lib/libvirt/qemu/VM_Orion-1.monitor

unix  2      [ ACC ]     STREAM     LISTENING     39353  20587/qemu-kvm      /var/lib/libvirt/qemu/omnivision_1.agent

unix  2      [ ]         STREAM     CONNECTING    0      -                   /var/lib/libvirt/qemu/omnivision_1.agent

unix  2      [ ]         STREAM     CONNECTING    0      -                   /var/lib/libvirt/qemu/omnivision_1.agent

unix  3      [ ]         STREAM     CONNECTED     39375  20587/qemu-kvm      /var/lib/libvirt/qemu/omnivision_1.agent

unix  3      [ ]         STREAM     CONNECTED     39373  20587/qemu-kvm      /var/lib/libvirt/qemu/VM_Orion-1.monitor

 

 

on the guest side , I try to retrieve datas sent by host , by using this kind of thing  :

 

...

int fd = open("/dev/virtio-ports/org.qemu.guest_agent.0", O_RDWR | O_NONBLOCK);

    ssize_t size = read(fd, &buffer, 100);

...

 

 

As you can imagine , I never receive any data from the host .

 

 

Is it the right way to use this “unix-type”  channel ?

 

Thx for your patience.

 

Regards,

 

J.P. Ribeauville

 

P: +33.(0).1.47.17.27.87

 

 

Puteaux 3 Etage 5  Bureau 4

 

jpribeauville axway com
http://www.axway.com

 

 

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