From 45556aef4dcc1ae78bbe68bc4842703d26f4763a Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Wed, 18 Sep 2019 13:11:45 -0400
Subject: xvnc: add option -r to share local display to remote side

---
 dot/local/bin/xvnc | 46 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

(limited to 'dot/local/bin/xvnc')

diff --git a/dot/local/bin/xvnc b/dot/local/bin/xvnc
index 951c079..9bc982b 100755
--- a/dot/local/bin/xvnc
+++ b/dot/local/bin/xvnc
@@ -1,33 +1,57 @@
 #!/bin/sh
-remote_host=${1:-blackboard}
-remote_display=${2:-:0}
-local_display=${3:-0}
 
 direct_connection()
 {
     port=$((5900 + local_display))
     ssh -o ControlPath=none -n \
-        -L $port:localhost:$port "$remote_host" 'x11vnc -nopw -ncache -ncache_cr -localhost -display :0' &
+        -L $port:localhost:$port "$remote_host" "x11vnc -nopw -ncache -ncache_cr -localhost -display ${remote_display}" &
     pid=$!
     sleep 1 # surrender race
     xvncviewer -encodings "copyrect tight zrle hextile" localhost:0
     kill $pid
 }
 
+quietly()
+{
+    "$@" >/dev/null 2>&1
+}
+
 reverse_connection()
 {
     port=5500
     xvncviewer -fullscreen -encodings "copyrect tight zrle hextile" -listen &
     pid=$!
-    ssh -o ControlPath=none \
-        -R $port:localhost:$port "$remote_host" \
-        "x11vnc -nopw -localhost -display ${remote_display} -coe localhost:$port -rfbport 0" \
-        >/dev/null 2>&1
+    quietly ssh -o ControlPath=none \
+                -R $port:localhost:$port "$remote_host" \
+                "x11vnc -q -nopw -localhost -display ${remote_display} -coe localhost:$port -rfbport 0"
     kill $pid
 }
 
-if [ "$USE_DIRECT_CONNECTION" ]; then
-    direct_connection
+share_display()
+{
+    set -x
+    port=5500
+    fuser -vk $port/tcp
+    ssh -o ControlPath=none \
+        -o ExitOnForwardFailure=yes \
+        -f \
+        -L $port:localhost:$port "$remote_host" \
+        "fuser -vk $port/tcp; DISPLAY=${remote_display} xvncviewer -fullscreen -encodings 'copyrect tight zrle hextile' -listen"
+    trap "fuser -vk $port/tcp" INT
+    sleep 1
+    x11vnc -q -nopw -localhost -display ${local_display} -coe localhost:$port -rfbport 0
+}
+
+if [ "$1" = -r ]
+then
+    shift
+    cmd=share_display
 else
-    reverse_connection
+    cmd=reverse_connection
 fi
+
+remote_host=${1:-blackboard}
+remote_display=${2:-:0}
+local_display=${3:-:0}
+
+$cmd
-- 
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