From a9603ec450b14220b288f4999e6b8ca3f93683a9 Mon Sep 17 00:00:00 2001
From: Dmitry Ermakov <ermakovdmitry8@gmail.com>
Date: Tue, 6 Feb 2024 21:30:56 +0300
Subject: [PATCH] Allow binding TCP socket to interface by passing 'iface' arg.
 Linux only.

---
 dvrip.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dvrip.py b/dvrip.py
index b234ca2..820e74d 100644
--- a/dvrip.py
+++ b/dvrip.py
@@ -4,7 +4,7 @@ import json
 from time import sleep
 import hashlib
 import threading
-from socket import socket, AF_INET, SOCK_STREAM, SOCK_DGRAM
+from socket import socket, AF_INET, SOCK_STREAM, SOCK_DGRAM, SOL_SOCKET
 from datetime import *
 from re import compile
 import time
@@ -100,6 +100,7 @@ class DVRIPCam(object):
     def __init__(self, ip, **kwargs):
         self.logger = logging.getLogger(__name__)
         self.ip = ip
+        self.iface = kwargs.get("iface", None)
         self.user = kwargs.get("user", "admin")
         hash_pass = kwargs.get("hash_pass")
         self.hash_pass = kwargs.get(
@@ -130,6 +131,9 @@ class DVRIPCam(object):
                 self.socket_send = self.tcp_socket_send
                 self.socket_recv = self.tcp_socket_recv
                 self.socket = socket(AF_INET, SOCK_STREAM)
+                if self.iface:
+                    self.socket.setsockopt(
+                        SOL_SOCKET, 25, str(self.iface + '\0').encode())
                 self.socket.connect((self.ip, self.port))
             elif self.proto == "udp":
                 self.socket_send = self.udp_socket_send