nhrp: T3599: Migrate NHRP to XML/Python

1 files changed, 136 insertions, 0 deletions

diff --git a/src/etc/opennhrp/opennhrp-script.py b/src/etc/opennhrp/opennhrp-script.py
new file mode 100755
index 000000000..74c45f2f6
--- /dev/null
+++ b/src/etc/opennhrp/opennhrp-script.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from pprint import pprint
+import os
+import re
+import sys
+import vici
+
+from vyos.util import cmd
+from vyos.util import process_named_running
+
+NHRP_CONFIG="/etc/opennhrp/opennhrp.conf"
+
+def parse_type_ipsec(interface):
+    with open(NHRP_CONFIG, 'r') as f:
+        lines = f.readlines()
+        match = rf'^interface {interface} #(hub|spoke)(?:\s([\w-]+))?$'
+        for line in lines:
+            m = re.match(match, line)
+            if m:
+                return m[1], m[2]
+    return None, None
+
+def vici_initiate(conn, child_sa, src_addr, dest_addr):
+    try:
+        session = vici.Session()
+        logs = session.initiate({
+            'ike': conn,
+            'child': child_sa,
+            'timeout': '-1',
+            'my-host': src_addr,
+            'other-host': dest_addr
+        })
+        for log in logs:
+            message = log['msg'].decode('ascii')
+            print('INIT LOG:', message)
+        return True
+    except:
+        return None
+
+def vici_terminate(conn, child_sa, src_addr, dest_addr):
+    try:
+        session = vici.Session()
+        logs = session.terminate({
+            'ike': conn,
+            'child': child_sa,
+            'timeout': '-1',
+            'my-host': src_addr,
+            'other-host': dest_addr
+        })
+        for log in logs:
+            message = log['msg'].decode('ascii')
+            print('TERM LOG:', message)
+        return True
+    except:
+        return None
+
+def iface_up(interface):
+    cmd(f'sudo ip route flush proto 42 dev {interface}')
+    cmd(f'sudo ip neigh flush dev {interface}')
+
+def peer_up(dmvpn_type, conn):
+    src_addr = os.getenv('NHRP_SRCADDR')
+    src_nbma = os.getenv('NHRP_SRCNBMA')
+    dest_addr = os.getenv('NHRP_DESTADDR')
+    dest_nbma = os.getenv('NHRP_DESTNBMA')
+    dest_mtu = os.getenv('NHRP_DESTMTU')
+
+    if dest_mtu:
+        args = cmd(f'sudo ip route get {dest_nbma} from {src_nbma}')
+        cmd(f'sudo ip route add {args} proto 42 mtu {dest_mtu}')
+
+    if conn and dmvpn_type == 'spoke' and process_named_running('charon'):
+        vici_terminate(conn, 'dmvpn', src_nbma, dest_nbma)
+        vici_initiate(conn, 'dmvpn', src_nbma, dest_nbma)
+
+def peer_down(dmvpn_type, conn):
+    src_nbma = os.getenv('NHRP_SRCNBMA')
+    dest_nbma = os.getenv('NHRP_DESTNBMA')
+
+    if conn and dmvpn_type == 'spoke' and process_named_running('charon'):
+        vici_terminate(conn, 'dmvpn', src_nbma, dest_nbma)
+
+    cmd(f'sudo ip route del {dest_nbma} src {src_nbma} proto 42')
+
+def route_up(interface):
+    dest_addr = os.getenv('NHRP_DESTADDR')
+    dest_prefix = os.getenv('NHRP_DESTPREFIX')
+    next_hop = os.getenv('NHRP_NEXTHOP')
+
+    cmd(f'sudo ip route replace {dest_addr}/{dest_prefix} proto 42 via {next_hop} dev {interface}')
+    cmd('sudo ip route flush cache')
+
+def route_down(interface):
+    dest_addr = os.getenv('NHRP_DESTADDR')
+    dest_prefix = os.getenv('NHRP_DESTPREFIX')
+
+    cmd(f'sudo ip route del {dest_addr}/{dest_prefix} proto 42')
+    cmd('sudo ip route flush cache')
+
+if __name__ == '__main__':
+    action = sys.argv[1]
+    interface = os.getenv('NHRP_INTERFACE')
+    dmvpn_type, profile_name = parse_type_ipsec(interface)
+
+    dmvpn_conn = None
+
+    if profile_name:
+        dmvpn_conn = f'dmvpn-{profile_name}-{interface}'
+
+    if action == 'interface-up':
+        iface_up(interface)
+    elif action == 'peer-register':
+        pass
+    elif action == 'peer-up':
+        peer_up(dmvpn_type, dmvpn_conn)
+    elif action == 'peer-down':
+        peer_down(dmvpn_type, dmvpn_conn)
+    elif action == 'route-up':
+        route_up(interface)
+    elif action == 'route-down':
+        route_down(interface)