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>

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 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

P Pensez à l’environnement avant d’imprimer.