Add PID in ETW DNS event in the integration dll #1768
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (2)
windows_core_dll/dllmain.cpp (1)
163-163: Fix typo in function commentThe comment has a typo: "recourses" should be "resources".
- // PM_ETWFlushTrace Closes the session and frees recourses. + // PM_ETWFlushTrace Closes the session and frees resources.service/firewall/interception/dnsmonitor/eventlistener_windows.go (1)
82-82: Consider documenting the new PID parameterWhile the unused parameter is correctly prefixed with underscore, it would be helpful to document why the PID parameter was added and any future plans for its usage.
-func (l *Listener) processEvent(domain string, _pid uint32, result string) { +// processEvent processes DNS events from ETW +// Parameters: +// domain: The DNS query domain name +// _pid: Process ID of the DNS query originator (reserved for future use) +// result: The DNS query result +func (l *Listener) processEvent(domain string, _pid uint32, result string) {
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📒 Files selected for processing (3)
service/firewall/interception/dnsmonitor/etwlink_windows.go(3 hunks)service/firewall/interception/dnsmonitor/eventlistener_windows.go(1 hunks)windows_core_dll/dllmain.cpp(4 hunks)
🔇 Additional comments (5)
windows_core_dll/dllmain.cpp (2)
25-25: LGTM: Callback signature updated to include process ID
The callback type now includes the process ID parameter, properly typed as uint32_t.
82-82: LGTM: Process ID correctly propagated from event header
The process ID is correctly retrieved from eventRecord->EventHeader.ProcessId and passed to the callback.
service/firewall/interception/dnsmonitor/etwlink_windows.go (2)
25-26: LGTM: NewSession signature updated to include process ID
The function signature properly includes the process ID parameter, maintaining type consistency with the C++ layer.
38-39: LGTM: Process ID correctly forwarded in callback
The Windows callback correctly forwards the process ID from C++ to Go without any type conversion issues.
service/firewall/interception/dnsmonitor/eventlistener_windows.go (1)
82-82: Verify the impact of unused PID parameter
The PID parameter is currently unused. Consider if there are any immediate use cases for this information, such as:
- Logging the process information for debugging
- Filtering DNS queries based on process
- Security auditing
✅ Verification successful
Let me gather more context about the usage of PID in DNS monitoring and event handling.
Let me try a different approach to understand the DNS event handling implementation.
Keep the PID parameter for future DNS monitoring capabilities
The PID parameter should be retained as it's part of a broader DNS monitoring system:
- The ETW (Event Tracing for Windows) session explicitly collects PID information (
etwlink_windows.go) - The codebase has infrastructure for PID-based DNS request tracking (
network/dns.go) - While currently unused in
processEvent, the PID parameter provides valuable context for potential future features like process-based DNS filtering or debugging
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check if PID is used in logging or filtering elsewhere in the codebase
rg -g '!vendor' 'pid.*dns|dns.*pid' .
Length of output: 564
Script:
#!/bin/bash
# Check for PID usage in DNS monitoring and event handling
ast-grep --pattern 'func $_($_ *Listener) processEvent(domain string, pid uint32, $_) {
$$$
}'
# Check for other DNS event handling with PID
rg -g '!vendor' -B 2 -A 2 'processEvent.*pid.*domain|domain.*pid.*processEvent' .
Length of output: 182
Script:
#!/bin/bash
# Look for DNS event handling implementations
rg -g '!vendor' -B 3 -A 3 'type.*Listener.*struct|func.*Listener.*Event' .
# Check for any PID usage in the DNS monitor package
fd . -t f -e go | grep -i dns | xargs rg 'pid'
Length of output: 4418
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Copilot reviewed 2 out of 3 changed files in this pull request and generated no suggestions.
Files not reviewed (1)
- windows_core_dll/dllmain.cpp: Language not supported
Comments skipped due to low confidence (2)
service/firewall/interception/dnsmonitor/etwlink_windows.go:25
- Corrected spelling of 'initilizes' to 'initializes' and 'DestorySession' to 'DestroySession'.
// NewSession creates new ETW event listener and initializes it. This is a low level interface, make sure to call DestroySession when you are done using it.
service/firewall/interception/dnsmonitor/etwlink_windows.go:86
- Corrected spelling of 'stopes' to 'stops'.
// StopTrace stops the trace. This will cause StartTrace to return.
Summary by CodeRabbit
New Features
Bug Fixes