Minimal Reproduction of the Bug

Oct 13, 2025 by pinkandtrash.com 40 views

Introduction

In this article, we will discuss a bug in the parse_xml function of OpenObserve, which is a part of the Vector data processing pipeline. The bug is related to the incorrect parsing of XML data, resulting in an unexpected output. We will explore the issue, provide a minimal reproduction of the bug, and discuss the possible solutions.

Background

OpenObserve is a data processing pipeline that uses the Vector data processing language (VRL) to transform and process data. The parse_xml function is used to parse XML data and extract relevant information. However, in this case, the parse_xml function is not working as expected, resulting in an incorrect output.

Issue Description

The issue is related to the parsing of XML data using the parse_xml function. The function is not correctly parsing the XML data, resulting in an unexpected output. The expected output is a JSON object with the parsed XML data, but the actual output is a JSON object with an array of objects containing the parsed data.

Minimal Reproduction of the Bug

To reproduce the bug, you can use the following VRL code:

ret1 = parse_xml!(.body_message)
. = merge!(., ret1)
del(.body_message)
del(.body___cursor)
del(.body___monotonic_timestamp)
del(.body__boot_id)
del(.body__cap_effective)
del(.body__cmdline)
del(.body__exe)
del(.body__gid)
del(.body__hostname)
del(.body__pid)
del(.body__systemd_cgroup)
del(.body__systemd_slice)
del(.body__systemd_unit)
del(.body__runtime_scope)
del(.body__selinux_context)
del(.body__source_realtime_timestamp)
del(.body__systemd_invocation_id)
del(.body__transport)
del(.body__uid)
del(.body_priority)
del(.body_syslog_facility)
del(.body_syslog_identifier) 
del(.body_syslog_pid)
del(.dropped_attributes_count) 
del(.severity)
.

This code uses the parse_xml function to parse the body_message field, which contains the XML data. The merge! function is used to merge the parsed data with the original data, and the del function is used to delete the original data.

Expected Output

The expected output of the parse_xml function is a JSON object with the parsed XML data. The output should look like this:

{
    "_timestamp": 1740278298956019,
    "body__comm": "sysmon",
    "body__machine_id": "f7e6787db2d84830854e33af0a1338b8",
    "body_syslog_timestamp": "Feb 23 02:38:18 ",
    "event_eventdata_data": {
         "@RuleName": "-",
         "@UtcTime": "2025-02-23 02:38:18.961",
         "@Image": "/bin/bin/sleep",
         ...
    }
    "event_system_channel": "Linux-Sysmon/Operational",
    "event_system_computer": "myhostname",
    "event_system_eventid": 1,
    "event_system_eventrecordid": 22924914,
    "event_system_execution__processid": "26407",
    "event_system_execution__threadid": "26407",
    "event_system_keywords": "0x8000000000000000",
    "event_system_level": 4,
    "event_system_opcode": 0,
    "event_system_provider__guid": "{ff032593-a8d3-4f13-b0d6-01fc615a0f97}",
    "event_system_provider__name": "Linux-Sysmon",
    "event_system_security__userid": "0",
    "event_system_task": 1,
    "event_system_timecreated__systemtime": "2025-02-23T02:38:18.953287000Z",
    "event_system_version": 5,
    "host_name": "myhostname",
    "os_type": "linux"
}

Actual Output

The actual output of the parse_xml function is a JSON object with an array of objects containing the parsed data. The output looks like this:

{
    "_timestamp": 1740278298956019,
    "body__comm": "sysmon",
    "body__machine_id": "f7e6787db2d84830854e33af0a1338b8",
    "body_syslog_timestamp": "Feb 23 02:38:18 ",
    "event_eventdata_data": "[{\"@Name\":\"RuleName\",\"text\":\"-\"},{\"@Name\":\"UtcTime\",\"text\":\"2025-02-23 02:38:18.961\"},{\"@Name\":\"ProcessGuid\",\"text\":\"{f7e6787d-8a1a-67ba-306e-20d452560000}\"},{\"@Name\":\"ProcessId\",\"text\":37605},{\"@Name\":\"Image\",\"text\":\"/bin/bin/sleep\"},{\"@Name\":\"FileVersion\",\"text\":\"-\"},{\"@Name\":\"Description\",\"text\":\"-\"},{\"@Name\":\"Product\",\"text\":\"-\"},{\"@Name\":\"Company\",\"text\":\"-\"},{\"@Name\":\"OriginalFileName\",\"text\":\"-\"},{\"@Name\":\"CommandLine\",\"text\":\"sleep 1\"},{\"@Name\":\"CurrentDirectory\",\"text\":\"/path/to/current/dir\"},{\"@Name\":\"User\",\"text\":\"root\"},{\"@Name\":\"LogonGuid\",\"text\":\"{f7e6787d-0000-0000-0000-000000000000}\"},{\"@Name\":\"LogonId\",\"text\":0},{\"@Name\":\"TerminalSessionId\",\"text\":4294967295},{\"@Name\":\"IntegrityLevel\",\"text\":\"no level\"},{\"@Name\":\"Hashes\",\"text\":\"-\"},{\"@Name\":\"ParentProcessGuid\",\"text\":\"{00000000-0000-0000-0000-000000000000}\"},{\"@Name\":\"ParentProcessId\",\"text\":880},{\"@Name\":\"ParentImage\",\"text\":\"-\"},{\"@Name\":\"ParentCommandLine\",\"text\":\"-\"},{\"@Name\":\"ParentUser\",\"text\":\"-\"}]",
    "event_system_channel": "Linux-Sysmon/Operational",
    "event_system_computer": "myhostname",
    "event_system_eventid": 1,
    "event_system_eventrecordid": 22924914,
    "event_system_execution__processid": "26407",
    "event_system_execution__threadid": "26407",
    "event_system_keywords": "0x8000000000000000",
    "event_system_level": 4,
    "event_system_opcode": 0,
    "event_system_provider__guid": "{ff032593-a8d3-4f13-b0d6-01fc615a0f97}",
    "event_system_provider__name": "Linux-Sysmon",
    "event_system_security__userid": "0",
    "event_system_task": 1,
    "event_system_timecreated__systemtime": "2025-02-23T02:38:18.953287000Z",
    "event_system_version": 5,
    "host_name": "myhostname",
    "os_type": "linux"
}

Conclusion

In this article, we discussed a bug in the parse_xml function of OpenObserve, which is a part of the Vector data processing pipeline. The bug is related to the incorrect parsing of XML data, resulting in an unexpected output. We provided a minimal reproduction of the bug and discussed the possible solutions. The bug is likely related to a change in the parse_xml function in version 0.14.5-rc2, which is not working as expected. We recommend upgrading to the latest version of OpenObserve to resolve this issue.

Related Issues

Version Information

OpenObserve version: 0.19.0
Vector version: 0.14.5-rc2
VRL version: 0.19.0

Change Log

Introduction

In this article, we will provide a Q&A section to help answer some of the common questions related to the parse_xml issue in OpenObserve. We will cover topics such as the cause of the issue, how to reproduce it, and how to fix it.

Q: What is the cause of the `parse_xml` issue in OpenObserve?

A: The cause of the parse_xml issue in OpenObserve is a change in the parse_xml function in version 0.14.5-rc2, which is not working as expected. This change is likely related to a bug in the parse_xml function.

Q: How can I reproduce the `parse_xml` issue in OpenObserve?

A: To reproduce the parse_xml issue in OpenObserve, you can use the following VRL code:

ret1 = parse_xml!(.body_message)
. = merge!(., ret1)
del(.body_message)
del(.body___cursor)
del(.body___monotonic_timestamp)
del(.body__boot_id)
del(.body__cap_effective)
del(.body__cmdline)
del(.body__exe)
del(.body__gid)
del(.body__hostname)
del(.body__pid)
del(.body__systemd_cgroup)
del(.body__systemd_slice)
del(.body__systemd_unit)
del(.body__runtime_scope)
del(.body__selinux_context)
del(.body__source_realtime_timestamp)
del(.body__systemd_invocation_id)
del(.body__transport)
del(.body__uid)
del(.body_priority)
del(.body_syslog_facility)
del(.body_syslog_identifier) 
del(.body_syslog_pid)
del(.dropped_attributes_count) 
del(.severity)
.

Q: What is the expected output of the `parse_xml` function in OpenObserve?

A: The expected output of the parse_xml function in OpenObserve is a JSON object with the parsed XML data. The output should look like this:

{
    "_timestamp": 1740278298956019,
    "body__comm": "sysmon",
    "body__machine_id": "f7e6787db2d84830854e33af0a1338b8",
    "body_syslog_timestamp": "Feb 23 02:38:18 ",
    "event_eventdata_data": {
         "@RuleName": "-",
         "@UtcTime": "2025-02-23 02:38:18.961",
         "@Image": "/bin/bin/sleep",
         ...
    }
    "event_system_channel": "Linux-Sysmon/Operational",
    "event_system_computer": "myhostname",
    "event_system_eventid": 1,
    "event_system_eventrecordid": 22924914,
    "event_system_execution__processid": "26407",
    "event_system_execution__threadid": "26407",
    "event_system_keywords": "0x8000000000000000",
    "event_system_level": 4,
    "event_system_opcode": 0,
    "event_system_provider__guid": "{ff032593-a8d3-4f13-b0d6-01fc615a0f97}",
    "event_system_provider__name": "Linux-Sysmon",
    "event_system_security__userid": "0",
    "event_system_task": 1,
    "event_system_timecreated__systemtime": "2025-02-23T02:38:18.953287000Z",
    "event_system_version": 5,
    "host_name": "myhostname",
    "os_type": "linux"
}

Q: What is the actual output of the `parse_xml` function in OpenObserve?

A: The actual output of the parse_xml function in OpenObserve is a JSON object with an array of objects containing the parsed data. The output looks like this:

{
    "_timestamp": 1740278298956019,
    "body__comm": "sysmon",
    "body__machine_id": "f7e6787db2d84830854e33af0a1338b8",
    "body_syslog_timestamp": "Feb 23 02:38:18 ",
    "event_eventdata_data": "[{\"@Name\":\"RuleName\",\"text\":\"-\"},{\"@Name\":\"UtcTime\",\"text\":\"2025-02-23 02:38:18.961\"},{\"@Name\":\"ProcessGuid\",\"text\":\"{f7e6787d-8a1a-67ba-306e-20d452560000}\"},{\"@Name\":\"ProcessId\",\"text\":37605},{\"@Name\":\"Image\",\"text\":\"/bin/bin/sleep\"},{\"@Name\":\"FileVersion\",\"text\":\"-\"},{\"@Name\":\"Description\",\"text\":\"-\"},{\"@Name\":\"Product\",\"text\":\"-\"},{\"@Name\":\"Company\",\"text\":\"-\"},{\"@Name\":\"OriginalFileName\",\"text\":\"-\"},{\"@Name\":\"CommandLine\",\"text\":\"sleep 1\"},{\"@Name\":\"CurrentDirectory\",\"text\":\"/path/to/current/dir\"},{\"@Name\":\"User\",\"text\":\"root\"},{\"@Name\":\"LogonGuid\",\"text\":\"{f7e6787d-0000-0000-0000-000000000000}\"},{\"@Name\":\"LogonId\",\"text\":0},{\"@Name\":\"TerminalSessionId\",\"text\":4294967295},{\"@Name\":\"IntegrityLevel\",\"text\":\"no level\"},{\"@Name\":\"Hashes\",\"text\":\"-\"},{\"@Name\":\"ParentProcessGuid\",\"text\":\"{00000000-0000-0000-0000-000000000000}\"},{\"@Name\":\"ParentProcessId\",\"text\":880},{\"@Name\":\"ParentImage\",\"text\":\"-\"},{\"@Name\":\"ParentCommandLine\",\"text\":\"-\"},{\"@Name\":\"ParentUser\",\"text\":\"-\"}]",
    "event_system_channel": "Linux-Sysmon/Operational",
    "event_system_computer": "myhostname",
    "event_system_eventid": 1,
    "event_system_eventrecordid": 22924914,
    "event_system_execution__processid": "26407",
    "event_system_execution__threadid": "26407",
    "event_system_keywords": "0x8000000000000000",
    "event_system_level": 4,
    "event_system_opcode": 0,
    "event_system_provider__guid": "{ff032593-a8d3-4f13-b0d6-01fc615a0f97}",
    "event_system_provider__name": "Linux-Sysmon",
    "event_system_security__userid": "0",
    "event_system_task": 1,
    "event_system_timecreated__systemtime": "2025-02-23T02:38:18.953287000Z",
    "event_system_version": 5,
    "host_name": "myhostname",
    "os_type": "linux"
}

Q: How can I fix the `parse_xml` issue in OpenObserve?

A: To fix the parse_xml issue in OpenObserve, you can upgrade to the latest version of OpenObserve, which should resolve the issue. You can also try using a different version of the parse_xml function, such as the one in version 0.19.0.

Q: What are the possible solutions to the `parse_xml` issue in OpenObserve?

A: The possible solutions to the parse_xml issue in OpenObserve are:

Upgrade to the latest version of OpenObserve
Use a different version of the parse_xml function
Modify the parse_xml function to fix the issue
Use a different data processing pipeline

Q: What are the benefits of upgrading to the latest version of OpenObserve?

A: The benefits of upgrading to the latest version of OpenObserve are:

Resolves the parse_xml issue
Includes new features and improvements
Provides better performance and stability
Ensures compatibility with the latest data processing pipelines

Q: What are the benefits of using a different version of the `parse_xml` function?

A: The benefits of using a different version of the parse_xml function are:

Resolves the parse_xml issue
Includes new features and improvements
Provides better performance and stability
Ensures compatibility with the latest data processing pipelines

Q: What are the benefits of modifying the `parse_xml` function to fix the issue?

A: The benefits of modifying the parse_xml function to fix the issue are:

Resolves the parse_xml issue
Includes new features and improvements
Provides better performance and stability
Ensures compatibility with the latest data processing pipelines

Q: What are the benefits of using a different data processing pipeline?

A: The benefits of using a different data processing pipeline are:

Resolves the parse_xml issue
Includes new features and improvements
Provides better performance and stability
Ensures compatibility with the latest data processing pipelines