1 files changed, 127 insertions, 0 deletions
diff --git a/src/conf_mode/interfaces-wirelessmodem.py b/src/conf_mode/interfaces-wirelessmodem.py
new file mode 100755
index 000000000..6d168d918
--- /dev/null
+++ b/src/conf_mode/interfaces-wirelessmodem.py
@@ -0,0 +1,127 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 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/>.
+
+import os
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import get_interface_dict
+from vyos.configverify import verify_vrf
+from vyos.template import render
+from vyos.util import call
+from vyos.util import check_kmod
+from vyos.util import find_device_file
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+k_mod = ['option', 'usb_wwan', 'usbserial']
+
+def get_config():
+    """
+    Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
+    interface name will be added or a deleted flag
+    """
+    conf = Config()
+    base = ['interfaces', 'wirelessmodem']
+    wwan = get_interface_dict(conf, base)
+    return wwan
+
+def verify(wwan):
+    if 'deleted' in wwan:
+        return None
+
+    if not 'apn' in wwan:
+        raise ConfigError('No APN configured for "{ifname}"'.format(**wwan))
+
+    if not 'device' in wwan:
+        raise ConfigError('Physical "device" must be configured')
+
+    # we can not use isfile() here as Linux device files are no regular files
+    # thus the check will return False
+    if not os.path.exists(find_device_file(wwan['device'])):
+        raise ConfigError('Device "{device}" does not exist'.format(**wwan))
+
+    verify_vrf(wwan)
+
+    return None
+
+def generate(wwan):
+    # set up configuration file path variables where our templates will be
+    # rendered into
+    ifname = wwan['ifname']
+    config_wwan = f'/etc/ppp/peers/{ifname}'
+    config_wwan_chat = f'/etc/ppp/peers/chat.{ifname}'
+    script_wwan_pre_up = f'/etc/ppp/ip-pre-up.d/1010-vyos-wwan-{ifname}'
+    script_wwan_ip_up = f'/etc/ppp/ip-up.d/1010-vyos-wwan-{ifname}'
+    script_wwan_ip_down = f'/etc/ppp/ip-down.d/1010-vyos-wwan-{ifname}'
+
+    config_files = [config_wwan, config_wwan_chat, script_wwan_pre_up,
+                    script_wwan_ip_up, script_wwan_ip_down]
+
+    # Always hang-up WWAN connection prior generating new configuration file
+    call(f'systemctl stop ppp@{ifname}.service')
+
+    if 'deleted' in wwan:
+        # Delete PPP configuration files
+        for file in config_files:
+            if os.path.exists(file):
+                os.unlink(file)
+
+    else:
+        wwan['device'] = find_device_file(wwan['device'])
+
+        # Create PPP configuration files
+        render(config_wwan, 'wwan/peer.tmpl', wwan)
+        # Create PPP chat script
+        render(config_wwan_chat, 'wwan/chat.tmpl', wwan)
+
+        # generated script file must be executable
+
+        # Create script for ip-pre-up.d
+        render(script_wwan_pre_up, 'wwan/ip-pre-up.script.tmpl',
+               wwan, permission=0o755)
+        # Create script for ip-up.d
+        render(script_wwan_ip_up, 'wwan/ip-up.script.tmpl',
+               wwan, permission=0o755)
+        # Create script for ip-down.d
+        render(script_wwan_ip_down, 'wwan/ip-down.script.tmpl',
+               wwan, permission=0o755)
+
+    return None
+
+def apply(wwan):
+    if 'deleted' in wwan:
+        # bail out early
+        return None
+
+    if not 'disable' in wwan:
+        # "dial" WWAN connection
+        call('systemctl start ppp@{ifname}.service'.format(**wwan))
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        check_kmod(k_mod)
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)