[virt-viewer] virt-viewer: Allow TLS-only SPICE connections

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

When trying to connect to a VM which uses SPICE with only a tls port
set:
<graphics type='spice' tlsPort='-1' autoport='no' listen='0' keymap='en-us'>
    <listen type='address' address='0'/>
</graphics>
the connection will fail with
"Cannot determine the graphic address for the guest spice"

virt_viewer_extract_connect_info() indeed assumes that if no
non-TLS port is set, then this means we are trying to connect through
an already open socket, and otherwise the connection fails.
The presence of a TLS port is only checked when a non-TLS port is set.

This commit reworks that logic to start by extracting both the non-TLS
and TLS ports (only when using SPICE for the latter), and by only trying
to parse the socket to use if none of these 2 ports is set

This fixes rhbz#982840
---
 src/virt-viewer.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/virt-viewer.c b/src/virt-viewer.c
index 951a42b..207c9ca 100644
--- a/src/virt-viewer.c
+++ b/src/virt-viewer.c
@@ -335,24 +335,24 @@ virt_viewer_extract_connect_info(VirtViewer *self,
         goto cleanup;
 
     xpath = g_strdup_printf("string(/domain/devices/graphics[@type='%s']/@port)", type);
-    if ((gport = virt_viewer_extract_xpath_string(xmldesc, xpath)) == NULL) {
-        free(xpath);
+    gport = virt_viewer_extract_xpath_string(xmldesc, xpath);
+    g_free(xpath);
+    if (g_str_equal(type, "spice")) {
+        xpath = g_strdup_printf("string(/domain/devices/graphics[@type='%s']/@tlsPort)", type);
+        gtlsport = virt_viewer_extract_xpath_string(xmldesc, xpath);
+        g_free(xpath);
+    }
+
+    if (gport || gtlsport) {
+        xpath = g_strdup_printf("string(/domain/devices/graphics[@type='%s']/@listen)", type);
+        ghost = virt_viewer_extract_xpath_string(xmldesc, xpath);
+    } else {
         xpath = g_strdup_printf("string(/domain/devices/graphics[@type='%s']/@socket)", type);
         if ((unixsock = virt_viewer_extract_xpath_string(xmldesc, xpath)) == NULL) {
             virt_viewer_app_simple_message_dialog(app, _("Cannot determine the graphic address for the guest %s"),
                                                   priv->domkey);
             goto cleanup;
         }
-    } else {
-        if (g_str_equal(type, "spice")) {
-            free(xpath);
-            xpath = g_strdup_printf("string(/domain/devices/graphics[@type='%s']/@tlsPort)", type);
-            gtlsport = virt_viewer_extract_xpath_string(xmldesc, xpath);
-        }
-
-        free(xpath);
-        xpath = g_strdup_printf("string(/domain/devices/graphics[@type='%s']/@listen)", type);
-        ghost = virt_viewer_extract_xpath_string(xmldesc, xpath);
     }
 
     if (ghost && gport)
-- 
1.8.3.1

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