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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-22632

Agent responses truncate at 64kB

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    • Icon: Problem report Problem report
    • Resolution: Won't fix
    • Icon: Major Major
    • None
    • 6.4.1
    • Agent (G)
    • None
    • Fedora 36

      While working on a feature implementation in the system.sw.packages{,.get} items, I found that the two agents differ when it comes to returning long string data. The C implementation appears to limit the response to 64kB of data, while the Go implementation does not impose any such limit.

      % ./src/zabbix_agent/zabbix_agentd -f -c ~/zabbix_agentd.conf -t 'system.sw.packages[]' | wc -c
      65584
      % ./src/go/bin/zabbix_agent2 -f -c ~/zabbix_agent2.conf -t 'system.sw.packages[]' | wc -c
      128525
      % git sh
      Subject:     .......... [ZBXNEXT-826] updated release date [6.4.1]
      Author:      Sergejs Maklakovs <[email protected]>
      Committer:   Sergejs Maklakovs <[email protected]>
      Signature:   N
      Author date: Mon Apr 3 09:22:14 2023 +0300 [6 hours ago]
      Commit date: Mon Apr 3 09:22:14 2023 +0300 [6 hours ago]
      Parent(s):   8368c02a > (HEAD -> release/6.4, origin/release/6.4, origin/feature/DEV-2437-6.4)
      Commit:      546e284f
      Tree:        7bce8e8c 

      The item returns a string:

      % ./src/go/bin/zabbix_agent2 -f -c ~/zabbix_agent2.conf -t 'system.sw.packages[,rpm]'
      system.sw.packages[,rpm]                      [s|... 

      Which consists of a package manager prefix, and a list of comma separated package identifiers.

      system.sw.packages[,rpm]                      [s|[rpm] Box2D-2.4.1-8.fc37.x86_64, GConf2-3.2.6-36.fc37.x86_64 ... 

      This size limit results in the response being truncated, disregarding any item boundaries

      system.sw.packages[,rpm]                      [s|[rpm] Box2D-2.4.1-8.fc37.x86_64, GConf2-3.2.6-36.fc37.x86_64 ... libxml2-devel-2.10.3-2.fc37.x86_64, libxmlb-0.3.11-1.fc37.x86_64, libxshmfence-1.3-11.fc37.i686, libxshmfence-1.3-11.fc37.x86_64, libxslt-1.1.37-1.fc37.x86_64, libxslt-devel-1.1.37-1.fc37.x86_64, libyaml-0.2.5-8.fc37.x86_64, libytnef-2.0-2.fc] 

            zabbix.dev Zabbix Development Team
            jlambda Juris Lambda
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              Created:
              Updated:
              Resolved: