add logic for dynamic IP lookup for deltachat links and install #31

install_madmail.py

@@ -1,8 +1,36 @@
 import pexpect
 import json
+import socket
 from app import app
 from subprocess import run
 
+def resolve_butterbox_ip(hostname):
+    """Best-effort lookup of the box's current address, falling back to the
+    configured default. Mirrors app.routes.resolve_butterbox_ip but avoids a
+    circular import (routes imports this module) and reuses the hostname that
+    was already loaded from settings.txt."""
+    # 1. Resolve the box's own mDNS/.local name.
+    try:
+        ip = socket.gethostbyname(f"{hostname}.local")
+        if ip and not ip.startswith("127."):
+            return ip
+    except OSError:
+        pass
+
+    # 2. Fall back to the address of the primary outbound interface. The
+    #    connect() picks a route without sending any packets.
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
+            s.connect(("8.8.8.8", 80))
+            ip = s.getsockname()[0]
+            if ip and not ip.startswith("127."):
+                return ip
+    except OSError:
+        pass
+
+    # 3. Give up and use the configured access-point default.
+    return app.config['BUTTERBOX_DEFAULT_IP']
+
 def run_madmail_installer():
     with open("./settings.txt", "r") as f:
         settings = json.load(f)
@@ -18,7 +46,7 @@ def run_madmail_installer():
     child.expect("MX record")
     child.sendline(f"{butterbox_hostname}.local")
     child.expect("Public IP address")
-    child.sendline(app.config['BUTTERBOX_DEFAULT_IP'])
+    child.sendline(resolve_butterbox_ip(butterbox_hostname))
     child.expect("Additional domains")
     child.sendline("")
     child.expect("State directory")