Add MPTCP check support

debian/changelog

@@ -1,3 +1,9 @@
+omr-vps-admin (0.3+20210414) unstable; urgency=medium
+
+    * Add check MPTCP support
+
+ -- OpenMPTCProuter <contact@openmptcprouter.com>  Thu, 14 Apr 2021 21:10:30 +0200
+
 omr-vps-admin (0.3+20210408) unstable; urgency=medium
 
     * Fix timing attack potential vulnerability

omr-admin.py

@@ -34,6 +34,7 @@ import uvicorn
 import jwt
 from jwt import PyJWTError
 from netaddr import *
+from ipaddress import ip_address, IPv4Address, IPv6Address
 from netjsonconfig import OpenWrt
 from fastapi import Depends, FastAPI, HTTPException, Security, Query, Request
 from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm, SecurityScopes, OAuth2
@@ -1009,6 +1010,18 @@ async def status(request: Request):
     client_host = request.client.host
     return {"client_host": client_host}
 
+# Check if MPTCP is enabled on this connection
+@app.get('/mptcpsupport')
+async def mptcpsupport(request: Request):
+    ip = request.client.host
+    if type(ip_address(ip)) is IPv4Address:
+        ipr = list(reversed(ip.split('.')))
+        iptohex = '{:02X}{:02X}{:02X}{:02X}'.format(*map(int, ipr))
+        with open('/proc/net/mptcp_net/mptcp') as f:
+            if iptohex in f.read():
+                return {"mptcp": "working"}
+        return {"mptcp": "not working"}
+
 # Get VPS status
 @app.get('/status', summary="Get current server load average, uptime and release")
 async def status(userid: Optional[int] = Query(None), serial: Optional[str] = Query(None), current_user: User = Depends(get_current_user)):