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[libvirt] [Test] Add API to tunnel channels

Attached is a simple test program to exercise virDomainOpenChannel that
echoes a toupper()'d string and exits.  Edit the #defines as necessary
to match your setup.  You'll need a channel defined in the guest similar

    <channel type="unix">
      <source mode="bind" path="/tmp/guestfsd.sock"/>
      <target type="virtio" name="org.libguestfs.channel.0"/>

Run the test, and then inside of the VM, you should be able to:

    [root f17-minimal ~]# socat - /dev/virtio-ports/org.libguestfs.channel.0
    hello world
    [root f17-minimal ~]#

#include <ctype.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>
#include <libvirt/libvirt.h>

#define CONNECT_URI "qemu+ssh://root localhost/system"
#define DOMAIN "f17-minimal"
#define CHANNEL "org.libguestfs.channel.0"
#define BUF_SIZE 80

void upper(char *c)
  while (*c != '\0') {
    *c = toupper((unsigned char)*c);

int main(int argc, char *argv[])
  virConnectPtr conn;
  virDomainPtr dom;
  virStreamPtr st;
  int bytes_read;
  char buf[BUF_SIZE];

  if ((conn = virConnectOpen(CONNECT_URI)) == NULL)
    errx(1, "virConnectOpen");

  if ((dom = virDomainLookupByName(conn, DOMAIN)) == NULL)
    errx(1, "virDomainLookupByName");

  if ((st = virStreamNew(conn, 0)) == NULL)
    errx(1, "virStreamNew");

  if (virDomainOpenChannel(dom, CHANNEL, st, 0) == -1)
    errx(1, "virDomainOpenChannel");

  if ((bytes_read = virStreamRecv(st, buf, BUF_SIZE)) > 0) {
    buf[bytes_read] = '\0';
    virStreamSend(st, buf, strnlen(buf, BUF_SIZE));

  if (virStreamFinish(st) < 0)
    errx(1, "virStreamFinish");
  if (virStreamFree(st) < 0)
    errx(1, "virStreamFree");
  return 0;

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