feature: the web service serves the last lines of the journal of the router's units and of the log files web.log_files lists, at /logs.

ADR.md

@@ -1043,3 +1043,42 @@ HTTPS, a public name and the web service. Clients are managed like service accou
 it renames it in the clients. The signing key does not rotate; replacing it invalidates every ID
 token issued. Wrong client secrets lock the client like any account. The implicit and hybrid
 flows, dynamic client registration and public clients without a secret are not offered.
+
+## ADR-38: Bash completions are files per command in bash-completion's completions directory
+
+Status: Accepted
+
+Context: The `vpn-*` commands have many subcommands, options and names (users, groups, issuing
+CAs, templates, settings) that are hard to remember. bash-completion's README recommends its
+`completionsdir`, `/usr/share/bash-completion/completions` on Ubuntu, whose files it loads on the
+first Tab of their command, and calls the eagerly loaded `/etc/bash_completion.d` not
+recommended; it prefers the name `<command>.bash`, which noble's 2.11 and resolute's 2.16 both
+look up.
+
+Decision: The package installs `<command>.bash` for each `vpn-*` command into
+`/usr/share/bash-completion/completions` and recommends `bash-completion`. The completions read
+the names they offer from the commands themselves (`--json list`) or the package's Python
+modules (the schema, the configuration, the PKI's templates and reasons), not from copies, and
+send errors to `/dev/null`, so a user who may not read them gets the fixed words only.
+
+Consequences: Completions follow the code without being edited for each new setting or name. A
+Tab that offers names runs a command or Python, which takes a fraction of a second. The files
+are not conffiles; an administrator overrides one in `/etc/bash_completion.d` or the user's own
+completions directory.
+
+## ADR-39: /logs shows the last lines of listed units and files, capped per request
+
+Status: Accepted
+
+Context: The Router Manager should show the router's logs without SSH. The web service runs as
+root, so a path or a unit taken from a request could expose any file or journal on the router,
+and a log of gigabytes cannot be sent whole to a browser.
+
+Decision: `/logs` serves the journal of a fixed list of units, the package's own and the services
+it runs, or the whole journal, read with `journalctl`, and the files `web.log_files` lists,
+which `vpn-config-edit` sets; a unit or a path outside the lists is refused. A request answers
+at most 1000 lines, 200 by default, and a file is read from its last MiB only. The answer is
+read at each request; nothing is followed or kept.
+
+Consequences: Only administrators read logs, and only those listed. Showing a new file needs a
+configuration change, not code. Long histories stay with SSH and `journalctl`.

README.md

@@ -130,6 +130,7 @@ must have the type shown below; an unknown section or setting is an error.
 | `web` | `status_content` | string | `basic` | What `/` and `/status` show: `basic`, `standard` or `full` (see Status web service) |
 | `web` | `shell` | boolean | `false` | `/shell` opens a login shell for a member of `admins` with console login (see The shell) |
 | `web` | `shell_idle_minutes` | integer | `15` | Minutes without a keystroke after which a shell is closed, 1 to 1440 |
+| `web` | `log_files` | list | | Absolute paths of the log files `/logs` shows, at most 32 (see The /logs API) |
 | `web` | `shell_auth_timeout` | integer | `15` | Minutes after the last use of a shell in which a new shell opens without signing in again, 0 (always sign in) to 1440 |
 | `ssh` | `ldap_login` | boolean | `false` | sshd accepts the directory password of the console accounts in the directory (see Console login and SSH) |
 | `https` | `enabled` | boolean | `true` | Caddy serves the status web service and the Router Manager over HTTPS for `wan.local_fqdn` |
@@ -343,6 +344,7 @@ vpn-config-edit set web.port 7082
 vpn-config-edit set web.trusted_proxies 127.0.0.1,10.0.0.4
 vpn-config-edit set site_to_site.branch.addrs branch.example.net
 vpn-config-edit remove site_to_site.branch
+vpn-config-edit set --restart oidc.enabled true
 ```
 
 `show` prints the file as indented JSON and does not change it. `set` takes a setting as
@@ -351,10 +353,29 @@ creates with the defaults when it does not exist, and converts the value to the
 a whole number, `true` or `false`, a list separated by commas (an empty value is an empty list),
 or a string; an unknown setting is refused. `remove site_to_site.NAME` removes a connection. It
 checks the whole configuration as `vpn-router-setup` does, and only then writes the file,
-indented, with mode 0600, and reminds that `vpn-router-setup` applies it. The status web service
+indented, with mode 0600, and reminds that `vpn-router-setup` applies it; with `--restart`, `set`
+and `remove` restart `vpn-router-setup` and wait until it has applied the change, and exit with
+status 1 when it fails. The status web service
 writes the file the same way, and a lock keeps the two from overwriting each other's change. A
 refused request exits with status 2, any other failure with 1.
 
+## Bash completion
+
+Bash completes the commands, options and arguments of `vpn-router-user`, `vpn-router-group`,
+`vpn-router-token`, `vpn-config-edit`, `vpn-router-backup`, `vpn-router-ca` and
+`vpn-router-caddy` with the Tab key. The package installs a file per command in
+`/usr/share/bash-completion/completions`, which the `bash-completion` package, recommended by
+`vpn-router`, loads on the first Tab after the command. For root, who can read them, the
+completions also offer the users and groups of the directory, the settings and site-to-site
+connections of `vpn-router.json` with `true` and `false` for a boolean setting, and the issuing CAs and
+certificate templates; for other users only the fixed words.
+
+```sh
+sudo -i
+vpn-config-edit set oidc.<Tab>
+vpn-router-user passwd <Tab>
+```
+
 ## Applying changes
 
 ```sh
@@ -920,6 +941,7 @@ curl http://10.0.0.4:17081/
 | `/groups` | The groups of users; needs a token |
 | `/site-to-site` | The site-to-site connections: list, add, change and remove; needs a token |
 | `/account` | The account of the signed-in user: its details, its password and its TOTP enrolment; needs a user's token |
+| `/logs` | The last lines of the journal of the router's units and of the files of `web.log_files`; needs a token |
 | `/.well-known/openid-configuration`, `/oidc/...` | The OpenID Provider, on `127.0.0.1` only, where Caddy passes the requests (see OpenID Provider) |
 
 The status holds the state of `vpn-router-setup`, `slapd` and each PostgreSQL cluster unit
@@ -943,7 +965,7 @@ curl http://10.0.0.4:7081/status
 
 ### Tokens and signing in
 
-`/config`, `/users`, `/service-accounts`, `/groups`, `/site-to-site`, `/backup`, `/remote-access`, `/ca`, `/shell` and `/account` need a JWT in an `Authorization: Bearer` header, signed with
+`/config`, `/users`, `/service-accounts`, `/groups`, `/site-to-site`, `/backup`, `/remote-access`, `/ca`, `/logs`, `/shell` and `/account` need a JWT in an `Authorization: Bearer` header, signed with
 HS256 by the key the web service makes on its first run, `/etc/vpn-router/web.key` (root only).
 The key never leaves the router; while it does not exist these paths and `/auth` are not served
 (404). A missing, expired or wrongly signed token, or one of another algorithm, gets 401 with
@@ -1058,6 +1080,27 @@ router:
 - **A cluster that is not online:** `databases` and `size` are `null`.
 - **Collection:** the web service reads it with `psql` as the `postgres` user at each request.
 
+### The /logs API
+
+`/logs`, with the same token as `/config`, shows the last lines of the journal and of log files,
+read at each request:
+
+| Request | Answer |
+| --- | --- |
+| `GET /logs` | `{"units", "files", "max_lines"}`: the units whose journal it shows, the files of `web.log_files` and the most lines one request answers, 1000 |
+| `GET /logs/journal?unit=<unit>&lines=<n>` | `{"lines": [...]}`: the last lines of the unit's journal, or of the whole journal without `unit`, with ISO times |
+| `GET /logs/file?path=<path>&lines=<n>` | `{"lines": [...]}`: the last lines of a file `web.log_files` lists |
+
+The units are the package's own (`vpn-router-setup`, `-web`, `-metrics`, `-pki`, `-backup`,
+`-caddy`), `vpn-router-manager`, `caddy`, `slapd`, `nslcd`, `postgresql`, `strongswan`,
+`wg-quick@wg0`, `openvpn-server@vpn-router` and `ssh`. `lines` is 1 to 1000, 200 without it. A
+file is read from at most its last MiB, so very long lines give fewer lines. A unit or a file not
+in the lists is 404, as is a listed file that does not exist.
+
+```sh
+vpn-config-edit set web.log_files /var/log/syslog,/var/log/auth.log
+```
+
 ### The /users API
 
 `/users` manages users with the same token as `/config`, with the module `vpn-router-user` uses
@@ -1322,8 +1365,7 @@ answers it only on `127.0.0.1`, where Caddy passes the requests, so the provider
 over plain HTTP. The setting needs `web.enabled`, `https.enabled` and `wan.local_fqdn`.
 
 ```sh
-vpn-config-edit set oidc.enabled true
-systemctl restart vpn-router-setup
+vpn-config-edit set --restart oidc.enabled true
 curl https://router.example.com:7444/.well-known/openid-configuration
 ```
 

debian-package/debian/changelog

@@ -1,3 +1,40 @@
+vpn-router (0.30.0-1) unstable; urgency=medium
+
+  feature: the web service serves the last lines of the journal of the router's units and of the log files web.log_files lists, at /logs.
+
+  * GET /logs lists the units whose journal and the files whose lines it
+    serves; GET /logs/journal?unit=&lines= and /logs/file?path=&lines=
+    answer the last lines, 200 by default and at most 1000, a file read
+    from its last MiB. Units and files outside the lists are refused.
+  * The new setting web.log_files lists the absolute paths of the log
+    files, at most 32.
+
+ -- Slawomir Koszewski <slawek@koszewscy.waw.pl>  Mon, 26 Oct 2026 19:00:00 +0100
+
+vpn-router (0.29.0-1) unstable; urgency=medium
+
+  feature: vpn-config-edit set and remove take --restart, which applies the change with vpn-router-setup and waits for it.
+
+  * vpn-config-edit set --restart and remove --restart restart
+    vpn-router-setup after writing the configuration and wait until it has
+    applied the change; a failed run exits with status 1 and points to its
+    journal. Bash completes --restart.
+
+ -- Slawomir Koszewski <slawek@koszewscy.waw.pl>  Mon, 26 Oct 2026 17:00:00 +0100
+
+vpn-router (0.28.0-1) unstable; urgency=medium
+
+  feature: bash completes the vpn-* commands, their options and the names they take.
+
+  * Bash completes the commands, options and arguments of vpn-router-user,
+    vpn-router-group, vpn-router-token, vpn-config-edit, vpn-router-backup,
+    vpn-router-ca and vpn-router-caddy, from
+    /usr/share/bash-completion/completions; for root also the users,
+    groups, issuing CAs, templates, settings and site-to-site connections.
+  * The package recommends bash-completion.
+
+ -- Slawomir Koszewski <slawek@koszewscy.waw.pl>  Mon, 26 Oct 2026 16:00:00 +0100
+
 vpn-router (0.27.0-1) unstable; urgency=medium
 
   feature: the web service is an OpenID Provider, which signs the directory's users in to other systems, the clients being service accounts with redirect URIs.

debian-package/debian/control

@@ -39,6 +39,7 @@ Depends: ${misc:Depends},
          iproute2,
          systemd-resolved,
          zstd
+Recommends: bash-completion
 Suggests: caddy,
           rclone,
           proxmox-backup-client-static

debian-package/debian/install

@@ -31,5 +31,6 @@ src/usr/lib/vpn-router/generate-config                usr/lib/vpn-router/
 src/usr/lib/vpn-router/vpnrouter_platforms/*.py       usr/lib/vpn-router/vpnrouter_platforms/
 src/usr/share/vpn-router/templates/*                  usr/share/vpn-router/templates/
 src/usr/share/vpn-router/sql/*                        usr/share/vpn-router/sql/
+src/usr/share/bash-completion/completions/*.bash      usr/share/bash-completion/completions/
 src/usr/lib/systemd/system/caddy.service.d/vpn-router.conf usr/lib/systemd/system/caddy.service.d/
 src/usr/share/doc/vpn-router/vpn-router.json.example  usr/share/doc/vpn-router/

debian-package/src/usr/lib/vpn-router/vpnrouter.py

@@ -58,7 +58,8 @@ SCHEMA = {
     'openvpn':    {'enabled': False, 'address_pool': '', 'port': 1194, 'protocol': 'udp'},
     'docker':     {'mode': 'auto', 'exposed_ports': []},
     'web':        {'enabled': True, 'listen': DEFAULT_LISTEN, 'port': 7081, 'database': '', 'trusted_proxies': [],
-                   'status_content': 'basic', 'shell': False, 'shell_idle_minutes': 15, 'shell_auth_timeout': 15},
+                   'status_content': 'basic', 'shell': False, 'shell_idle_minutes': 15, 'shell_auth_timeout': 15,
+                   'log_files': []},
     'ssh':        {'ldap_login': False},
     'https':      {'enabled': True, 'email': '', 'web_port': 7444, 'manager_port': 7443, 'caddy_source': 'ubuntu'},
     'oidc':       {'enabled': False},
@@ -126,6 +127,9 @@ ACME_HTTP_PORT = 80
 #: The default port of HTTPS, where Caddy publishes the CA files when pki.publish has https-default.
 HTTPS_DEFAULT_PORT = 443
 
+#: The most files web.log_files lists.
+LOG_FILES_MAX = 32
+
 #: Where vpn-router-setup installs Caddy from, https.caddy_source: the Ubuntu archive or Caddy's own repository.
 CADDY_SOURCES = ('ubuntu', 'upstream')
 
@@ -518,6 +522,13 @@ def validate(cfg):
     for item in _get_list(cfg, 'web', 'trusted_proxies'):
         _check_address(item, 'web.trusted_proxies')
 
+    log_files = _get_list(cfg, 'web', 'log_files')
+    if len(log_files) > LOG_FILES_MAX:
+        raise ConfigError(f'web.log_files: at most {LOG_FILES_MAX} files')
+    for item in log_files:
+        if not item.startswith('/') or '/../' in f'{item}/':
+            raise ConfigError(f'web.log_files: {item!r} is not an absolute path')
+
     caddy_source = _get(cfg, 'https', 'caddy_source')
     if caddy_source not in CADDY_SOURCES:
         raise ConfigError(f'https.caddy_source: {caddy_source!r} is not one of {", ".join(CADDY_SOURCES)}')

debian-package/src/usr/lib/vpn-router/web

@@ -47,6 +47,8 @@ Pages:
   /metrics/history
            the metrics the metrics service keeps, for a view: hour, day, month or year (see
            metrics_history())
+  /logs    the last lines of the journal of the router's units and of the files web.log_files lists
+           (see logs())
   /postgresql
            the databases of each PostgreSQL cluster on the router with their sizes, as JSON (see
            postgresql_databases()); /config has the clusters' settings
@@ -55,7 +57,7 @@ Pages:
            loopback address, where Caddy passes the requests of the HTTPS site; POST /oidc/login counts
            towards the limit of /auth calls
 
-/status/full, /config, /metrics/history, /postgresql, /users, /service-accounts, /groups, /site-to-site, /backup, /remote-access, /ca, /shell and /account need an HS256 JWT in an Authorization: Bearer header signed
+/status/full, /config, /metrics/history, /postgresql, /users, /service-accounts, /groups, /site-to-site, /backup, /remote-access, /ca, /logs, /shell and /account need an HS256 JWT in an Authorization: Bearer header signed
 with vpnrouter_auth.WEB_KEY (see vpnrouter_auth.verify). A token of /auth names a user in sub;
 /account serves that user, and the other paths need a member of vpnrouter_users.ADMIN_GROUP. A
 token of vpn-router-token has the admin claim and names no user; it may call every path but
@@ -157,6 +159,16 @@ REFRESH_SECONDS = 60
 POSTGRESQL_SETTINGS = ('server_version', 'listen_addresses', 'port', 'max_connections', 'shared_buffers',
                        'effective_cache_size', 'work_mem', 'password_encryption', 'ssl', 'timezone')
 
+#: The units whose journal /logs/journal shows, besides the whole journal: the package's own and the services it runs.
+JOURNAL_UNITS = ('vpn-router-setup', 'vpn-router-web', 'vpn-router-metrics', 'vpn-router-pki', 'vpn-router-backup',
+                 'vpn-router-caddy', 'vpn-router-manager', 'caddy', 'slapd', 'nslcd', 'postgresql', 'strongswan',
+                 'wg-quick@wg0', 'openvpn-server@vpn-router', 'ssh')
+
+#: The most lines /logs answers, the number it answers without lines, and the most bytes it reads from the end of a file.
+LOG_LINES_MAX = 1000
+LOG_LINES_DEFAULT = 200
+LOG_BYTES_MAX = 1024 * 1024
+
 #: The largest request body accepted, in bytes; a CSR or a certificate chain in PEM is a few kilobytes.
 BODY_LIMIT = 65536
 
@@ -1059,6 +1071,63 @@ def account(name, method, path, body):
     return 200, document
 
 
+def tail(path, count):
+    """The last count lines of a file, read from at most LOG_BYTES_MAX bytes at its end, invalid UTF-8 replaced."""
+    with open(path, 'rb') as handle:
+        size = handle.seek(0, os.SEEK_END)
+        start = max(0, size - LOG_BYTES_MAX)
+        handle.seek(start)
+        lines = handle.read().decode('utf-8', 'replace').splitlines()
+    # A read that starts inside the file starts inside a line, which is left out.
+    return (lines[1:] if start and lines else lines)[-count:]
+
+
+def logs(method, path, query):
+    """Answer a /logs request: the HTTP status and the JSON document.
+
+      GET /logs           {"units": JOURNAL_UNITS, "files": web.log_files, "max_lines": LOG_LINES_MAX}
+      GET /logs/journal   {"lines": [...]}: the last lines of the journal, of the unit unit= names, one of
+                          JOURNAL_UNITS, or of the whole journal without it
+      GET /logs/file      {"lines": [...]}: the last lines of the file path= names, one of web.log_files
+
+    lines= is the number of lines, 1 to LOG_LINES_MAX, LOG_LINES_DEFAULT without it.
+    """
+    if method not in ('GET', 'HEAD'):
+        return 405, {'error': f'{method} is not allowed on /logs'}
+    try:
+        files = [item.strip() for item in vpnrouter.load_config()['web']['log_files'] if item.strip()]
+    except SystemExit as exc:
+        return 500, {'error': str(exc.code)}
+    if path == '/logs':
+        return 200, {'units': list(JOURNAL_UNITS), 'files': files, 'max_lines': LOG_LINES_MAX}
+    text = query.get('lines', [str(LOG_LINES_DEFAULT)])[0]
+    if not text.isdigit() or not 1 <= int(text) <= LOG_LINES_MAX:
+        return 400, {'error': f'lines must be a whole number from 1 to {LOG_LINES_MAX}'}
+    count = int(text)
+    if path == '/logs/journal':
+        unit = query.get('unit', [''])[0]
+        if unit and unit not in JOURNAL_UNITS:
+            return 404, {'error': f'{unit} is not one of the units whose journal /logs shows'}
+        try:
+            result = subprocess.run(['journalctl', '--no-pager', '--quiet', '--output=short-iso', f'--lines={count}',
+                                     *([f'--unit={unit}.service'] if unit else [])], capture_output=True, text=True,
+                                    errors='replace', timeout=30)
+        except (OSError, subprocess.TimeoutExpired) as exc:
+            return 500, {'error': f'journalctl cannot be run: {exc}'}
+        if result.returncode != 0:
+            return 500, {'error': result.stderr.strip() or f'journalctl ended with status {result.returncode}'}
+        return 200, {'lines': result.stdout.splitlines()[-count:]}
+    if path == '/logs/file':
+        name = query.get('path', [''])[0]
+        if name not in files:
+            return 404, {'error': f'{name!r} is not one of web.log_files'}
+        try:
+            return 200, {'lines': tail(name, count)}
+        except OSError as exc:
+            return (404 if isinstance(exc, FileNotFoundError) else 500), {'error': f'{name} cannot be read: {exc.strerror}'}
+    return 404, {'error': f'no route {method} {path}'}
+
+
 def metrics_history(view):
     """Answer GET /metrics/history?range=<view> with vpnrouter_metrics.history: the HTTP status and the JSON document.
 
@@ -1477,7 +1546,7 @@ class Handler(BaseHTTPRequestHandler):
         if self.command not in ('GET', 'HEAD'):
             self.close_connection = True
         directory = next((name for name in ('users', 'service-accounts', 'groups', 'account', 'site-to-site', 'backup',
-                                            'ca', 'shell', 'remote-access')
+                                            'ca', 'shell', 'remote-access', 'logs')
                           if path == f'/{name}' or path.startswith(f'/{name}/')), None)
         protected = path in ('/status/full', '/config', '/metrics/history', '/postgresql') or directory is not None
         signing = path in ('/auth', '/auth/passkey', '/auth/passkey/complete', '/auth/refresh', '/auth/logout')
@@ -1540,6 +1609,9 @@ class Handler(BaseHTTPRequestHandler):
         elif directory == 'ca':
             code, document = ca(self.command, path, payload)
             body, kind = json.dumps(document, indent=2).encode() + b'\n', 'application/json'
+        elif directory == 'logs':
+            code, document = logs(self.command, path, urllib.parse.parse_qs(urllib.parse.urlsplit(self.path).query))
+            body, kind = json.dumps(document).encode() + b'\n', 'application/json'
         elif directory == 'service-accounts':
             code, document = service_accounts(self.command, path, payload)
             body, kind = json.dumps(document, indent=2).encode() + b'\n', 'application/json'

debian-package/src/usr/sbin/vpn-config-edit

@@ -9,18 +9,21 @@ number, true or false, a list of strings separated by commas (an empty value is
 or a string. remove takes site_to_site.NAME and removes that connection. The configuration with
 the change is checked as vpn-router-setup checks it, and only then written with
 vpnrouter.save_config, holding vpnrouter.config_lock; vpn-router-setup applies it at its next
-run, which set and remove remind of. A failure is a message on standard error; the exit status
-is 2 for an invalid request and 1 for any other failure. -h or --help shows the options.
+run, which set and remove remind of. With --restart they restart vpn-router-setup and wait until
+it has applied the change. A failure is a message on standard error; the exit status is 2 for an
+invalid request and 1 for any other failure, a failed run of vpn-router-setup included. -h or
+--help shows the options.
 
   vpn-config-edit show
-  vpn-config-edit set SECTION.OPTION VALUE
-  vpn-config-edit set site_to_site.NAME.OPTION VALUE
-  vpn-config-edit remove site_to_site.NAME
+  vpn-config-edit set [--restart] SECTION.OPTION VALUE
+  vpn-config-edit set [--restart] site_to_site.NAME.OPTION VALUE
+  vpn-config-edit remove [--restart] site_to_site.NAME
 """
 
 import argparse
 import copy
 import json
+import subprocess
 import sys
 
 sys.path.insert(0, '/usr/lib/vpn-router')
@@ -86,6 +89,9 @@ def main(argv):
         setter.add_argument('value', metavar='VALUE', help='its value; a list separated by commas')
         remover = commands.add_parser('remove', help='remove a site-to-site connection and write the configuration')
         remover.add_argument('key', metavar='site_to_site.NAME', help='the connection')
+        for changer in (setter, remover):
+            changer.add_argument('--restart', action='store_true',
+                                 help='restart vpn-router-setup and wait until it has applied the change')
         options = parser.parse_args(argv)
 
         if options.command == 'show':
@@ -124,7 +130,14 @@ def main(argv):
         print(f'{options.key} set to {json.dumps(value)} in {vpnrouter.CONFIG_FILE}.')
     else:
         print(f'{options.key} removed from {vpnrouter.CONFIG_FILE}.')
-    print('Apply it with: systemctl restart vpn-router-setup')
+    if not options.restart:
+        print('Apply it with: systemctl restart vpn-router-setup, or --restart')
+        return 0
+    print('Restarting vpn-router-setup...', flush=True)
+    if subprocess.run(['systemctl', 'restart', 'vpn-router-setup.service']).returncode != 0:
+        print('vpn-config-edit: vpn-router-setup failed; see journalctl -u vpn-router-setup', file=sys.stderr)
+        return 1
+    print('vpn-router-setup applied it.')
     return 0
 
 

debian-package/src/usr/share/bash-completion/completions/vpn-config-edit.bash

@@ -0,0 +1,59 @@
+# bash completion for vpn-config-edit                                  -*- shell-script -*-
+
+# Python of the package that answers from its schema (vpnrouter.SCHEMA, vpnrouter.CONNECTION) and, read as root, the
+# site-to-site connections of the configuration: settings prints SECTION.OPTION of every setting and
+# site_to_site.NAME.OPTION of every connection, connections site_to_site.NAME, and values the values of a boolean
+# setting, $1.
+_vpn_config_edit_python()
+{
+    python3 -c '
+import sys
+sys.path.insert(0, "/usr/lib/vpn-router")
+import vpnrouter
+try:
+    connections = vpnrouter.read_settings().get("site_to_site", {})
+except (OSError, vpnrouter.ConfigError):
+    connections = {}
+if sys.argv[1] == "settings":
+    print("\n".join(f"{section}.{option}" for section, options in vpnrouter.SCHEMA.items() for option in options))
+    print("\n".join(f"site_to_site.{name}.{option}" for name in connections for option in vpnrouter.CONNECTION))
+elif sys.argv[1] == "connections":
+    print("\n".join(f"site_to_site.{name}" for name in connections))
+else:
+    section, _, option = sys.argv[2].rpartition(".")
+    defaults = vpnrouter.CONNECTION if section.startswith("site_to_site.") else vpnrouter.SCHEMA.get(section, {})
+    if isinstance(defaults.get(option), bool):
+        print("true\nfalse")
+' "$@" 2>/dev/null
+}
+
+_vpn_config_edit()
+{
+    local cur prev words cword split
+    _init_completion -s || return
+
+    # The command is the first word that is not an option; the arguments are the words after it.
+    local i command='' args=()
+    for ((i = 1; i < cword; i++)); do
+        if [[ -z $command ]]; then
+            [[ ${words[i]} != -* ]] && command=${words[i]}
+        elif [[ ${words[i]} != -* ]]; then
+            args+=("${words[i]}")
+        fi
+    done
+
+    if [[ $cur == -* ]]; then
+        COMPREPLY=($(compgen -W "--help$([[ $command == @(set|remove) ]] && echo ' --restart')" -- "$cur"))
+        return
+    fi
+
+    case $command,${#args[@]} in
+        ,*) COMPREPLY=($(compgen -W 'show set remove' -- "$cur")) ;;
+        set,0) COMPREPLY=($(compgen -W "$(_vpn_config_edit_python settings)" -- "$cur")) ;;
+        set,1) COMPREPLY=($(compgen -W "$(_vpn_config_edit_python values "${args[0]}")" -- "$cur")) ;;
+        remove,0) COMPREPLY=($(compgen -W "$(_vpn_config_edit_python connections)" -- "$cur")) ;;
+    esac
+} &&
+    complete -F _vpn_config_edit vpn-config-edit
+
+# ex: filetype=sh

debian-package/src/usr/share/bash-completion/completions/vpn-router-backup.bash

@@ -0,0 +1,41 @@
+# bash completion for vpn-router-backup                                -*- shell-script -*-
+
+_vpn_router_backup()
+{
+    local cur prev words cword split
+    _init_completion -s || return
+
+    # The command is the first word that is not an option; the arguments are the words after it.
+    local i command='' args=0 pbs=false
+    for ((i = 1; i < cword; i++)); do
+        if [[ -z $command ]]; then
+            [[ ${words[i]} != -* ]] && command=${words[i]}
+        elif [[ ${words[i]} == --pbs ]]; then
+            pbs=true
+        elif [[ ${words[i]} != -* ]]; then
+            ((args++))
+        fi
+    done
+
+    if [[ -z $command ]]; then
+        if [[ $cur == -* ]]; then
+            COMPREPLY=($(compgen -W '--help' -- "$cur"))
+        else
+            COMPREPLY=($(compgen -W 'run list restore' -- "$cur"))
+        fi
+        return
+    fi
+
+    if [[ $cur == -* ]]; then
+        COMPREPLY=($(compgen -W "--help$([[ $command == restore ]] && echo ' --pbs --yes')" -- "$cur"))
+        return
+    fi
+
+    # restore takes a local archive, or with --pbs a snapshot name, which vpn-router-backup list shows.
+    if [[ $command == restore ]] && ((args == 0)) && ! $pbs; then
+        _filedir
+    fi
+} &&
+    complete -F _vpn_router_backup vpn-router-backup
+
+# ex: filetype=sh

debian-package/src/usr/share/bash-completion/completions/vpn-router-ca.bash

@@ -0,0 +1,98 @@
+# bash completion for vpn-router-ca                                    -*- shell-script -*-
+
+# Python of the package that prints the revocation reasons (reasons) or, from the configuration read as root, the
+# issuing CAs (cas) or the certificate templates (templates), which other users do not get.
+_vpn_router_ca_python()
+{
+    python3 -c '
+import sys
+sys.path.insert(0, "/usr/lib/vpn-router")
+import vpnrouter
+import vpnrouter_pki
+if sys.argv[1] == "reasons":
+    print("\n".join(vpnrouter_pki.REASONS))
+else:
+    cfg = vpnrouter.load_config()
+    print("\n".join(vpnrouter.issuing_cas(cfg) if sys.argv[1] == "cas" else vpnrouter.pki_templates(cfg)))
+' "$@" 2>/dev/null
+}
+
+_vpn_router_ca()
+{
+    local cur prev words cword split
+    _init_completion -s || return
+
+    # The command and, for ca and root, the action are the first words that are not options; the arguments are the
+    # words after them but option values.
+    local i command='' action='' args=0
+    for ((i = 1; i < cword; i++)); do
+        case ${words[i]} in
+            --ca | --template | --csr | --subject | --san | --pfx | --reason | --out) ((i++)) ;;
+            -*) ;;
+            *)
+                if [[ -z $command ]]; then
+                    command=${words[i]}
+                elif [[ $command == @(ca|root) && -z $action ]]; then
+                    action=${words[i]}
+                else
+                    ((args++))
+                fi
+                ;;
+        esac
+    done
+
+    case $prev in
+        --ca)
+            COMPREPLY=($(compgen -W "$(_vpn_router_ca_python cas)" -- "$cur"))
+            return
+            ;;
+        --template)
+            COMPREPLY=($(compgen -W "$(_vpn_router_ca_python templates)" -- "$cur"))
+            return
+            ;;
+        --reason)
+            COMPREPLY=($(compgen -W "$(_vpn_router_ca_python reasons)" -- "$cur"))
+            return
+            ;;
+        --csr | --pfx | --out)
+            _filedir
+            return
+            ;;
+        --subject | --san)
+            return
+            ;;
+    esac
+    $split && return
+
+    if [[ -z $command ]]; then
+        if [[ $cur == -* ]]; then
+            COMPREPLY=($(compgen -W '--json --help' -- "$cur"))
+        else
+            COMPREPLY=($(compgen -W 'status list issue revoke maintain ca root' -- "$cur"))
+        fi
+        return
+    fi
+
+    if [[ $cur == -* ]]; then
+        local options='--help'
+        case $command$action in
+            list) options+=' --ca' ;;
+            issue) options+=' --ca --template --csr --subject --san --pfx' ;;
+            revoke) options+=' --reason' ;;
+            rootexport-key) options+=' --out' ;;
+            rootremove-key) options+=' --yes' ;;
+        esac
+        COMPREPLY=($(compgen -W "$options" -- "$cur"))
+        return
+    fi
+
+    case $command,$action,$args in
+        ca,,*) COMPREPLY=($(compgen -W 'csr import' -- "$cur")) ;;
+        root,,*) COMPREPLY=($(compgen -W 'export-key remove-key import-key import-crl' -- "$cur")) ;;
+        ca,*,0) COMPREPLY=($(compgen -W "$(_vpn_router_ca_python cas)" -- "$cur")) ;;
+        ca,import,1 | root,import-key,0 | root,import-crl,0) _filedir ;;
+    esac
+} &&
+    complete -F _vpn_router_ca vpn-router-ca
+
+# ex: filetype=sh

debian-package/src/usr/share/bash-completion/completions/vpn-router-caddy.bash

@@ -0,0 +1,24 @@
+# bash completion for vpn-router-caddy                                 -*- shell-script -*-
+
+_vpn_router_caddy()
+{
+    local cur prev words cword
+    _init_completion || return
+
+    # After the command only --help is left.
+    local word
+    for word in "${words[@]:1:cword-1}"; do
+        if [[ $word != -* ]]; then
+            [[ $cur == -* ]] && COMPREPLY=($(compgen -W '--help' -- "$cur"))
+            return
+        fi
+    done
+    if [[ $cur == -* ]]; then
+        COMPREPLY=($(compgen -W '--json --help' -- "$cur"))
+    else
+        COMPREPLY=($(compgen -W 'status apply use-upstream' -- "$cur"))
+    fi
+} &&
+    complete -F _vpn_router_caddy vpn-router-caddy
+
+# ex: filetype=sh

debian-package/src/usr/share/bash-completion/completions/vpn-router-group.bash

@@ -0,0 +1,74 @@
+# bash completion for vpn-router-group                                 -*- shell-script -*-
+
+# The names of the users and of the groups of the router's directory, read as root; nothing for other users.
+_vpn_router_group_users()
+{
+    vpn-router-user --json list 2>/dev/null |
+        python3 -c 'import json, sys; print("\n".join(user["name"] for user in json.load(sys.stdin)["users"]))' 2>/dev/null
+}
+
+_vpn_router_group_names()
+{
+    vpn-router-group --json list 2>/dev/null |
+        python3 -c 'import json, sys; print("\n".join(group["name"] for group in json.load(sys.stdin)["groups"]))' 2>/dev/null
+}
+
+_vpn_router_group()
+{
+    local cur prev words cword split
+    _init_completion -s || return
+
+    # The command is the first word that is not an option; the arguments are the words after it but option values.
+    local i command='' args=0
+    for ((i = 1; i < cword; i++)); do
+        if [[ -z $command ]]; then
+            [[ ${words[i]} != -* ]] && command=${words[i]}
+            continue
+        fi
+        case ${words[i]} in
+            --member | --description | --name) ((i++)) ;;
+            -*) ;;
+            *) ((args++)) ;;
+        esac
+    done
+
+    if [[ -z $command ]]; then
+        if [[ $cur == -* ]]; then
+            COMPREPLY=($(compgen -W '--json --help' -- "$cur"))
+        else
+            COMPREPLY=($(compgen -W 'list add update remove member-add member-remove' -- "$cur"))
+        fi
+        return
+    fi
+
+    case $prev in
+        --member)
+            COMPREPLY=($(compgen -W "$(_vpn_router_group_users)" -- "$cur"))
+            return
+            ;;
+        --description | --name)
+            return
+            ;;
+    esac
+    $split && return
+
+    if [[ $cur == -* ]]; then
+        local options='--help'
+        case $command in
+            add) options+=' --member --description' ;;
+            update) options+=' --name --description' ;;
+        esac
+        COMPREPLY=($(compgen -W "$options" -- "$cur"))
+        return
+    fi
+
+    # The group, which add takes new, then the user of member-add and member-remove.
+    if ((args == 0)) && [[ $command != @(list|add) ]]; then
+        COMPREPLY=($(compgen -W "$(_vpn_router_group_names)" -- "$cur"))
+    elif ((args == 1)) && [[ $command == member-@(add|remove) ]]; then
+        COMPREPLY=($(compgen -W "$(_vpn_router_group_users)" -- "$cur"))
+    fi
+} &&
+    complete -F _vpn_router_group vpn-router-group
+
+# ex: filetype=sh

debian-package/src/usr/share/bash-completion/completions/vpn-router-token.bash

@@ -0,0 +1,25 @@
+# bash completion for vpn-router-token                                 -*- shell-script -*-
+
+_vpn_router_token()
+{
+    local cur prev words cword split
+    _init_completion -s || return
+
+    case $prev in
+        --minutes | --hours | --days)
+            return
+            ;;
+    esac
+    $split && return
+
+    # The lifetime is one of --minutes, --hours and --days.
+    local options='--json --help' word
+    for word in "${words[@]:1:cword-1}"; do
+        [[ $word == --@(minutes|hours|days)* ]] && break
+    done
+    [[ $word == --@(minutes|hours|days)* ]] || options+=' --minutes --hours --days'
+    COMPREPLY=($(compgen -W "$options" -- "$cur"))
+} &&
+    complete -F _vpn_router_token vpn-router-token
+
+# ex: filetype=sh

debian-package/src/usr/share/bash-completion/completions/vpn-router-user.bash

@@ -0,0 +1,84 @@
+# bash completion for vpn-router-user                                  -*- shell-script -*-
+
+# The names of the users and of the groups of the router's directory, read as root; nothing for other users.
+_vpn_router_user_names()
+{
+    vpn-router-user --json list 2>/dev/null |
+        python3 -c 'import json, sys; print("\n".join(user["name"] for user in json.load(sys.stdin)["users"]))' 2>/dev/null
+}
+
+_vpn_router_user_groups()
+{
+    vpn-router-group --json list 2>/dev/null |
+        python3 -c 'import json, sys; print("\n".join(group["name"] for group in json.load(sys.stdin)["groups"]))' 2>/dev/null
+}
+
+_vpn_router_user()
+{
+    local cur prev words cword split
+    _init_completion -s || return
+
+    local commands='list add update passwd disable enable unlock remove profile otp-new otp-enrol otp-remove console
+        passkeys-remove'
+
+    # The command is the first word that is not an option; the arguments are the words after it but option values.
+    local i command='' args=0
+    for ((i = 1; i < cword; i++)); do
+        if [[ -z $command ]]; then
+            [[ ${words[i]} != -* ]] && command=${words[i]}
+            continue
+        fi
+        case ${words[i]} in
+            --first-name | --last-name | --email | --display-name | --description | --redirect-uri | \
+                --post-logout-redirect-uri | --allowed-group | --account) ((i++)) ;;
+            -*) ;;
+            *) ((args++)) ;;
+        esac
+    done
+
+    if [[ -z $command ]]; then
+        if [[ $cur == -* ]]; then
+            COMPREPLY=($(compgen -W '--json --help' -- "$cur"))
+        else
+            COMPREPLY=($(compgen -W "$commands" -- "$cur"))
+        fi
+        return
+    fi
+
+    case $prev in
+        --allowed-group)
+            COMPREPLY=($(compgen -W "$(_vpn_router_user_groups)" -- "$cur"))
+            return
+            ;;
+        --account)
+            # The local accounts console --account takes: a uid from 1000 to 19999, not nobody.
+            COMPREPLY=($(compgen -W "$(getent passwd | awk -F: '$3 >= 1000 && $3 < 20000 && $1 != "nobody" { print $1 }')" -- "$cur"))
+            return
+            ;;
+        --first-name | --last-name | --email | --display-name | --description | --redirect-uri | --post-logout-redirect-uri)
+            return
+            ;;
+    esac
+    $split && return
+
+    if [[ $cur == -* ]]; then
+        local options='--help'
+        case $command in
+            add) options+=' --first-name --last-name --email --service --display-name --description --redirect-uri
+                --post-logout-redirect-uri --allowed-group' ;;
+            update) options+=' --first-name --last-name --email --display-name --description --redirect-uri
+                --post-logout-redirect-uri --allowed-group' ;;
+            console) options+=' --posix --account --off' ;;
+        esac
+        COMPREPLY=($(compgen -W "$options" -- "$cur"))
+        return
+    fi
+
+    # The user name, which add takes new; otp-enrol then takes a code.
+    if ((args == 0)) && [[ $command != @(list|add) ]]; then
+        COMPREPLY=($(compgen -W "$(_vpn_router_user_names)" -- "$cur"))
+    fi
+} &&
+    complete -F _vpn_router_user vpn-router-user
+
+# ex: filetype=sh

debian-package/src/usr/share/doc/vpn-router/vpn-router.json.example

@@ -64,7 +64,8 @@
     "status_content": "basic",
     "shell": false,
     "shell_idle_minutes": 15,
-    "shell_auth_timeout": 15
+    "shell_auth_timeout": 15,
+    "log_files": ["/var/log/syslog", "/var/log/auth.log"]
   },
   "ssh": {
     "ldap_login": false