get primary ip address | refs #28817

tests/test_email.py

@@ -179,7 +179,7 @@ def check_spf(ip_addr: str, sender: str, domain: str) -> tuple:
     errors = 0
 
     if ip_address(ip_addr).is_private:
-        u.info("{} is a private address, cannot check SPF")
+        u.info("{} is a private address, cannot check SPF".format(ip_addr))
     elif ip_addr and sender:
         # check spf
         result, _ = spf.check2(i=ip_addr, s=domain, h="")
@@ -215,6 +215,7 @@ def main():
         (socket.gethostbyname(relay) if relay else None)
         or conf.get("NETWORK_IP_NAT")
         or conf.get("NETWORK_IP")
+        or u.get_ip()
         or None
     )
     sender = conf.get("EMAIL_SENDER") or None

utils.py

@@ -449,3 +449,23 @@ def mkcert(
             cert_dir + "/cert.pem",
         ]
     )
+
+
+def get_ip() -> str:
+    """Get the "primary" ip address, the one used by the default route.
+
+    :return: IP address
+    :rtype: str
+    """
+
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    try:
+        # doesn't have to be reachable
+        s.connect(("10.255.255.255", 1))
+        IP = s.getsockname()[0]
+    except Exception:
+        IP = "127.0.0.1"
+    finally:
+        s.close()
+
+    return IP