Merge #1296 #1322 #1337 #1358

1296: fetchmail: print unhandled exceptions, but don't crash r=Nebukadneza a=Al2Klimov

fixes #1295

1322: Bump validators from 0.12.5 to 0.12.6 in /core/admin r=Nebukadneza a=dependabot[bot]

Bumps [validators](https://github.com/kvesteri/validators) from 0.12.5 to 0.12.6.
<details>
<summary>Changelog</summary>

*Sourced from [validators's changelog](https://github.com/kvesteri/validators/blob/master/CHANGES.rst).*

> 0.12.6 (2019-05-08)
> ^^^^^^^^^^^^^^^^^^^
> 
> - Fixed domain validator for single character domains ([#118](https://github-redirect.dependabot.com/kvesteri/validators/issues/118), pull request courtesy kingbuzzman)
</details>
<details>
<summary>Commits</summary>

- See full diff in [compare view](https://github.com/kvesteri/validators/commits)
</details>
<br />

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1337: Add IPv6 to allow_nets r=Nebukadneza a=PhilRW

Roundcube was not connecting to sieve with IPv6 enabled.

Fixes #1336

1358: Add port to relay if it contains a colon r=Nebukadneza a=PhilRW

## What type of PR?

enhancement

## What does this PR do?

Allows relaying domains to non-standard SMTP ports by appending `:port` to the destination host/IP. E.g., `mx1.internal:2525`

### Related issue(s)

Closes #1357 


## Prerequistes
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [x] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.


Co-authored-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Philip Rosenberg-Watt <p.rosenberg-watt@cablelabs.com>

core/admin/mailu/configuration.py

@@ -67,6 +67,7 @@ DEFAULT_CONFIG = {
     'HOST_REDIS': 'redis',
     'HOST_FRONT': 'front',
     'SUBNET': '192.168.203.0/24',
+    'SUBNET6': None,
     'POD_ADDRESS_RANGE': None
 }
 

core/admin/mailu/internal/views/dovecot.py

@@ -11,6 +11,8 @@ def dovecot_passdb_dict(user_email):
     user = models.User.query.get(user_email) or flask.abort(404)
     allow_nets = []
     allow_nets.append(app.config["SUBNET"])
+    if app.config["SUBNET6"]:
+        allow_nets.append(app.config["SUBNET6"])
     if app.config["POD_ADDRESS_RANGE"]:
         allow_nets.append(app.config["POD_ADDRESS_RANGE"])
     return flask.jsonify({

core/admin/mailu/internal/views/postfix.py

@@ -37,7 +37,11 @@ def postfix_transport(email):
         return flask.abort(404)
     localpart, domain_name = models.Email.resolve_domain(email)
     relay = models.Relay.query.get(domain_name) or flask.abort(404)
-    return flask.jsonify("smtp:[{}]".format(relay.smtp))
+    ret = "smtp:[{0}]".format(relay.smtp)
+    if ":" in relay.smtp:
+        split = relay.smtp.split(':')
+        ret = "smtp:[{0}]:{1}".format(split[0], split[1])
+    return flask.jsonify(ret)
 
 
 @internal.route("/postfix/recipient/map/<path:recipient>")

core/admin/requirements-prod.txt

@@ -44,7 +44,7 @@ SQLAlchemy==1.3.3
 srslib==0.1.4
 tabulate==0.8.3
 tenacity==5.0.4
-validators==0.12.5
+validators==0.12.6
 visitor==0.1.3
 Werkzeug==0.15.3
 WTForms==2.2.1

optional/fetchmail/fetchmail.py

@@ -8,6 +8,7 @@ import subprocess
 import re
 import requests
 import sys
+import traceback
 
 
 FETCHMAIL = """
@@ -45,6 +46,7 @@ def fetchmail(fetchmailrc):
 
 
 def run(debug):
+    try:
         fetches = requests.get("http://admin/internal/fetch").json()
         smtphost, smtpport = extract_host_port(os.environ.get("HOST_SMTP", "smtp"), None)
         if smtpport is None:
@@ -86,6 +88,8 @@ def run(debug):
                 requests.post("http://admin/internal/fetch/{}".format(fetch["id"]),
                     json=error_message.split("\n")[0]
                 )
+    except Exception:
+        traceback.print_exc()
 
 
 if __name__ == "__main__":

towncrier/newsfragments/1357.feature

@@ -0,0 +1 @@
+Relay a domain to a nonstandard SMTP port by adding ":<port_num>" to the remote hostname or IP address.