RPC not working (HTTP status 500)

[kongsted]

Hi,

I'm trying to do a setup with three servers, where I want RPC to work between the servers.
The servers are running Rocky Linux 9.2 with "native" PHP (8.0.30).

I have done the config.php to work with RPC, but despites that, I'm only getting "HTTP/1.1 500 Internal Server Error" returned from the other servers (they're using a copy of the config, to ensure it's working - and the web-interface with MailWatch are also working fine - except RPC - from the other servers).

I'm using MailWatch version 1.2.30.

Any clue how to troubleshoot this issue? :)

Br,
Anders

[Skywalker-11]

Do you see any error in the webserver log?

[kongsted]

I'm "only" seeing the apache-log with the error.

1.2.3.4 - - [01/Feb/2025:22:07:51 +0100] "POST /rpcserver.php HTTP/1.0" 500 - "-" "XML-RPC for PHP 3.0.0.beta"

Or is there somewhere else to check some logs?

[Skywalker-11]

The log message look like it is from the access log. In most cases (but depending on your specific config) apache has separate log files for logging general requests (the access log) and error messages.

If you use php-fpm these errors might also be logged on those logs.

[kongsted]

Thank you for learning me something new - wasn't aware of those logs. :)

Error-out in php-fpm:
[01-Feb-2025 22:54:53 Europe/Copenhagen] PHP Fatal error: Uncaught Error: Call to undefined function each() in /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc:2701 Stack trace: #0 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1854): xmlrpcval->serialize() #1 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpcs.inc(561): xmlrpcresp->serialize() #2 /opt/mailwatch/mailscanner/rpcserver.php(333): xmlrpc_server->service() #3 {main} thrown in /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc on line 2701

[Skywalker-11]

The error should be fixed by 4b58985

Can you try the current code in the 1.2 branch and see if that fixes your issues?

[kongsted]

I have tried with the latest code (downloaded the zip-file of the repo - not only the few changed files in the commit).

It fails, and very little are showed on the webpage (only the first elements).

Error in php-fpm log:

[02-Feb-2025 09:51:51 Europe/Copenhagen] PHP Warning:  Undefined array key "%rules-dir%" in /opt/mailwatch/mailscanner/functions.php on line 1916
[02-Feb-2025 09:51:51 Europe/Copenhagen] PHP Warning:  Undefined array key "%rules-dir%" in /opt/mailwatch/mailscanner/functions.php on line 1916
[02-Feb-2025 09:51:51 Europe/Copenhagen] PHP Fatal error:  Uncaught Error: Call to undefined function each() in /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc:2096
Stack trace:
#0 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(2239): xmlrpcmsg->parseResponseHeaders()
#1 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1520): xmlrpcmsg->parseResponse()
#2 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1300): xmlrpc_client->sendPayloadCURL()
#3 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1094): xmlrpc_client->sendPayloadHTTPS()
#4 /opt/mailwatch/mailscanner/functions.php(4176): xmlrpc_client->send()
#5 /opt/mailwatch/mailscanner/functions.php(588): xmlrpc_wrapper()
#6 /opt/mailwatch/mailscanner/functions.php(410): printMTAQueue()
#7 /opt/mailwatch/mailscanner/status.php(32): html_start()
#8 {main}
  thrown in /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc on line 2096

(I'm not sure why the warning - the variable are defined with the value '/etc/MailScanner/rules' when checking /msconfig.php)

[endelwar]

Looks like I missed an each last summer, my bad!

[kongsted]

No problem. :)

But new error occours. :)

[03-Feb-2025 18:22:17 Europe/Copenhagen] PHP Fatal error:  Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, string given in /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc:2329
Stack trace:
#0 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1520): xmlrpcmsg->parseResponse()
#1 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1300): xmlrpc_client->sendPayloadCURL()
#2 /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc(1094): xmlrpc_client->sendPayloadHTTPS()
#3 /opt/mailwatch/mailscanner/functions.php(4212): xmlrpc_client->send()
#4 /opt/mailwatch/mailscanner/functions.php(591): xmlrpc_wrapper()
#5 /opt/mailwatch/mailscanner/functions.php(413): printMTAQueue()
#6 /opt/mailwatch/mailscanner/status.php(32): html_start()
#7 {main}
  thrown in /opt/mailwatch/mailscanner/lib/xmlrpc/xmlrpc.inc on line 2329

[kongsted]

When I'm debugging, it seems like getting some kind of the expected response from remote server.

---GOT---
HTTP/1.1 200 OK
Date: Thu, 06 Feb 2025 21:11:58 GMT
Server: Apache/2.4.62 (Rocky Linux) OpenSSL/3.2.2
X-Powered-By: PHP/8.0.30
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Content-Encoding: gzip
Vary: Accept-Encoding
Set-Cookie: MW_LANG=en; path=/
Set-Cookie: PHPSESSID=<removed>; path=/; HttpOnly
Transfer-Encoding: chunked
Content-Type: text/xml; charset=UTF-8

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
<params>
<param>
<value><struct>
<member><name>inq</name>
<value><string>0</string></value>
</member>
<member><name>outq</name>
<value><string>0</string></value>
</member>
</struct></value>
</param>
</params>
</methodResponse>
---END---

HEADER: date: Thu, 06 Feb 2025 21:11:58 GMT
HEADER: server: Apache/2.4.62 (Rocky Linux) OpenSSL/3.2.2
HEADER: x-powered-by: PHP/8.0.30
HEADER: x-xss-protection: 1; mode=block
HEADER: x-frame-options: SAMEORIGIN
HEADER: x-content-type-options: nosniff
HEADER: expires: Thu, 19 Nov 1981 08:52:00 GMT
HEADER: cache-control: no-store, no-cache, must-revalidate
HEADER: pragma: no-cache
HEADER: content-encoding: gzip
HEADER: vary: Accept-Encoding
HEADER: set-cookie: MW_LANG=en; path=/, PHPSESSID=<removed>; path=/; HttpOnly
HEADER: transfer-encoding: chunked
HEADER: content-type: text/xml; charset=UTF-8
COOKIE: MW_LANG=en
COOKIE: PHPSESSID=<removed>

The response above is identical if there is one or two servers listed in "RPC_REMOTE_SERVER" (there is 3 servers in total in the setup).

[kongsted]

Any idea to something I could test, to troubleshoot this issue? :)
//Anders

[Skywalker-11]

This commit should fix the TypeError but I see some other things that are currently not working correctly for a distributed setup (mainly regarding displaying the actual mails and quarantine management). But at least the page should load normally then.

bf43faa

[kongsted]

@Skywalker-11 that fix solved the problem. I did only replace xmlrpc.inc, and it solved the problem.

As I can see, the current config works with removing all the status-boxes in the top of the page, if "define('DISTRIBUTED_SETUP', false);" is set to true instead.
So yes, it could be more optimal in a distributed setup. Now you just have to be aware which server you're on, to get the status of the server. But at least it's now possible to open mails across the servers, and it's possible to learn spamassassin/bayes-database. :)

Thank you both for your help on this issue! 👍