From 7323ae399b2dbd85ede41f1b61b95c78a69031e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gytis=20Sto=C5=A1kevi=C4=8Dius?=
 <gytisstoskevicius@gmail.com>
Date: Mon, 31 Mar 2025 15:51:22 +0300
Subject: [PATCH] add static network interface configuration when network is
 bridge

---
 src/entry.sh   | 47 +++++++++++++++++++++++--------------
 src/network.sh | 63 ++++++++++++++++++++++++++++++++++++++++++++++----
 src/power.sh   | 15 ++++++------
 3 files changed, 95 insertions(+), 30 deletions(-)
 mode change 100644 => 100755 src/entry.sh
 mode change 100644 => 100755 src/network.sh

diff --git a/src/entry.sh b/src/entry.sh
old mode 100644
new mode 100755
index b037cdc..18d8e49
--- a/src/entry.sh
+++ b/src/entry.sh
@@ -8,32 +8,45 @@ SUPPORT="https://github.com/dockur/windows"
 
 cd /run
 
-. reset.sh      # Initialize system
-. define.sh     # Define versions
-. mido.sh       # Download code
-. install.sh    # Run installation
-. disk.sh       # Initialize disks
-. display.sh    # Initialize graphics
-. network.sh    # Initialize network
-. samba.sh      # Configure samba
-. boot.sh       # Configure boot
-. proc.sh       # Initialize processor
-. power.sh      # Configure shutdown
-. config.sh     # Configure arguments
+. reset.sh   # Initialize system
+. define.sh  # Define versions
+. mido.sh    # Download code
+. install.sh # Run installation
+. disk.sh    # Initialize disks
+. display.sh # Initialize graphics
+. network.sh # Initialize network
+. samba.sh   # Configure samba
+. boot.sh    # Configure boot
+. proc.sh    # Initialize processor
+. power.sh   # Configure shutdown
+. config.sh  # Configure arguments
 
 trap - ERR
 
 version=$(qemu-system-x86_64 --version | head -n 1 | cut -d '(' -f 1 | awk '{ print $NF }')
 info "Booting ${APP}${BOOT_DESC} using QEMU v$version..."
 
-{ qemu-system-x86_64 ${ARGS:+ $ARGS} >"$QEMU_OUT" 2>"$QEMU_LOG"; rc=$?; } || :
-(( rc != 0 )) && error "$(<"$QEMU_LOG")" && exit 15
+{
+    qemu-system-x86_64 ${ARGS:+ $ARGS} >"$QEMU_OUT" 2>"$QEMU_LOG"
+    rc=$?
+} || :
+((rc != 0)) && error "$(<"$QEMU_LOG")" && exit 15
 
 terminal
-( sleep 30; boot ) &
+(
+    sleep 30
+    boot
+    configure_guest_network_interface
+    info "Windows started succesfully, you can now connect using RDP"
+    if [[ "${NETWORK,,}" != "bridge"* ]]; then
+        info "or visit http://localhost:8006/ to view the screen..."
+    fi
+    touch "$STORAGE/ready"
+) &
 tail -fn +0 "$QEMU_LOG" 2>/dev/null &
-cat "$QEMU_TERM" 2> /dev/null | tee "$QEMU_PTY" &
+cat "$QEMU_TERM" 2>/dev/null | tee "$QEMU_PTY" &
 wait $! || :
 
-sleep 1 & wait $!
+sleep 1 &
+wait $!
 [ ! -f "$QEMU_END" ] && finish 0
diff --git a/src/network.sh b/src/network.sh
old mode 100644
new mode 100755
index da15ef0..13835fb
--- a/src/network.sh
+++ b/src/network.sh
@@ -25,6 +25,64 @@ ADD_ERR="Please add the following setting to your container:"
 # ######################################
 #  Functions
 # ######################################
+find_free_ip() {
+  local current_ip="$1"
+  local mask="$2"
+
+  # Get network prefix
+  IFS='.' read -r i1 i2 i3 i4 <<<"$current_ip"
+  IFS='.' read -r m1 m2 m3 m4 <<<"$(ip -o -f inet addr show | awk '/scope global/ {print $4}' | cut -d'/' -f2)"
+
+  network_ip=$((i1 & m1)).$((i2 & m2)).$((i3 & m3)).0
+  base_ip="$i1.$i2.$i3"
+
+  # Iterate over available IPs
+  for i in {2..254}; do
+    new_ip="$base_ip.$i"
+    if [[ "$new_ip" != "$current_ip" ]] && ! ping -c 1 -W 1 "$new_ip" &>/dev/null; then
+      echo "$new_ip"
+      return
+    fi
+  done
+
+  echo "No free IP found"
+}
+
+configure_guest_network_interface() {
+  if [[ "${NETWORK,,}" == "bridge"* ]]; then
+
+    HOST_INTERFACE="dockerbridge"
+    CURRENT_IP=$(ip addr show $HOST_INTERFACE | grep -oP 'inet \K[\d.]+')
+    MASK="$(ip -4 addr show $HOST_INTERFACE | awk '/inet / {print $2}' | cut -d'/' -f2)"
+
+    if [ -z "$CURRENT_IP" ]; then
+      echo "Error: Unable to retrieve the current IP address of $HOST_INTERFACE."
+      exit 1
+    fi
+
+    echo "Current Host IP: $CURRENT_IP"
+
+    IFS='.' read -r -a ip_parts <<<"$CURRENT_IP"
+    NEW_HOST_IP=$(find_free_ip "$CURRENT_IP" "$MASK")
+    GW="${ip_parts[0]}.${ip_parts[1]}.${ip_parts[2]}.1"
+
+    echo "New Host IP: $NEW_HOST_IP"
+
+    ip addr del $CURRENT_IP/$MASK dev $HOST_INTERFACE
+    ip addr add $NEW_HOST_IP/$MASK dev $HOST_INTERFACE
+
+    ip link set $HOST_INTERFACE down
+    ip link set $HOST_INTERFACE up
+
+    route add default gw $GW
+
+    echo -e '{"execute": "guest-exec", "arguments": {"path": "C:\\\\Windows\\\\System32\\\\netsh.exe", "arg": ["interface", "ipv4", "set", "address", "name=\\"Ethernet\\"", "static", "'"$CURRENT_IP"'", "255.255.255.0", "'"$GW"'"]}}' | nc -U /tmp/qga.sock -w 5
+    echo -e '{"execute": "guest-exec", "arguments": {"path": "C:\\\\Windows\\\\System32\\\\netsh.exe", "arg": ["interface", "ipv4", "add", "dnsservers", "name=\\"Ethernet\\"", "address=\\"'$GW'\\"", "index=\\"1\\""]}}' | nc -U /tmp/qga.sock -w 5
+
+  fi
+
+  return 0
+}
 
 configureDHCP() {
 
@@ -409,11 +467,6 @@ configureBridge() {
   #   error "Failed to set IP link!" && return 1
   # fi
 
-  # add initial default route as well
-  if ! ip route add default dev dockerbridge via ${VM_NET_IP%.*}.1; then
-    error "Failed to setup default route" && return 10
-  fi
-
   NET_OPTS="-netdev tap,id=hostnet0,ifname=$VM_NET_TAP"
 
   if [ -c /dev/vhost-net ]; then
diff --git a/src/power.sh b/src/power.sh
index 3e36701..b619f5f 100644
--- a/src/power.sh
+++ b/src/power.sh
@@ -17,8 +17,9 @@ rm -f "$QEMU_DIR/qemu.*"
 touch "$QEMU_LOG"
 
 _trap() {
-  func="$1" ; shift
-  for sig ; do
+  func="$1"
+  shift
+  for sig; do
     trap "$func $sig" "$sig"
   done
 }
@@ -35,8 +36,6 @@ boot() {
         grep -Fq "BOOTMGR is missing" "$QEMU_PTY" && fail="y"
       fi
       if [ -z "$fail" ]; then
-        info "Windows started succesfully, visit http://localhost:8006/ to view the screen..."
-        touch "$STORAGE/ready"
         return 0
       fi
     fi
@@ -129,7 +128,7 @@ terminal() {
 
     if [ -n "$msg" ]; then
 
-      if [[ "${msg,,}" != "char"* ||  "$msg" != *"serial0)" ]]; then
+      if [[ "${msg,,}" != "char"* || "$msg" != *"serial0)" ]]; then
         echo "$msg"
       fi
 
@@ -193,13 +192,13 @@ _graceful_shutdown() {
   fi
 
   # Send ACPI shutdown signal
-  echo 'system_powerdown' | nc -q 1 -w 1 localhost "${QEMU_PORT}" > /dev/null
+  echo 'system_powerdown' | nc -q 1 -w 1 localhost "${QEMU_PORT}" >/dev/null
 
   local cnt=0
   while [ "$cnt" -lt "$QEMU_TIMEOUT" ]; do
 
     sleep 1
-    cnt=$((cnt+1))
+    cnt=$((cnt + 1))
 
     ! isAlive "$pid" && break
     # Workaround for zombie pid
@@ -208,7 +207,7 @@ _graceful_shutdown() {
     info "Waiting for Windows to shutdown... ($cnt/$QEMU_TIMEOUT)"
 
     # Send ACPI shutdown signal
-    echo 'system_powerdown' | nc -q 1 -w 1 localhost "${QEMU_PORT}" > /dev/null
+    echo 'system_powerdown' | nc -q 1 -w 1 localhost "${QEMU_PORT}" >/dev/null
 
   done