How can I retrieve the initial IP address from the 'X-Forwarded-For' using a Log Insight Query?

Question

How can I retrieve the initial IP address from the 'X-Forwarded-For' using a Log Insight Query?

Can someone help me with extracting the initial IP address from the given data:

X-Forwarded-For":"1.1.1.1, 2.2.2.2

?

This is the query I am currently using:

fields @timestamp, @message
| filter @message like /Endpoint request body after transformations/
| parse @message "X-Forwarded-For\":\"*\"" as @IP
| stats count(*) by @IP
| limit 20

However, the results I am getting look like this:

1.1.1.1, 2.2.2.4
1.1.1.1, 2.2.2.5
1.1.1.1, 2.2.2.6

What modifications should I make in my query to only retrieve the first IP address?

json amazon-web-services amazon-cloudwatch amazon-cloudwatchlogs

Answer 1

Answer №1

When dealing with multiple IP addresses separated by commas, you can simplify the parsing process by stopping at the comma instead of the end quote, like so:

| parse @message "X-Forwarded-For\":\"*," as @IP

If there is a possibility of having only one IP address without a comma at the end, you can modify the code like this:

| parse @message /X-Forwarded-For\":\"(?<@IP>.*?)[,\"]/

This will capture everything up to the first comma or the closing quote, adjusting for scenarios where the comma may not be present.

Answer 2

When dealing with multiple IP addresses separated by commas, you can simplify the parsing process by stopping at the comma instead of the end quote, like so:

| parse @message "X-Forwarded-For\":\"*," as @IP

If there is a possibility of having only one IP address without a comma at the end, you can modify the code like this:

| parse @message /X-Forwarded-For\":\"(?<@IP>.*?)[,\"]/

This will capture everything up to the first comma or the closing quote, adjusting for scenarios where the comma may not be present.

How can I retrieve the initial IP address from the 'X-Forwarded-For' using a Log Insight Query?

Answer №1

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