Huang Guan Hao created HDDS-13943:
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Summary: Add input validation for protocol format in
DirstreamClientHandler to prevent ArrayIndexOutOfBoundsException
Key: HDDS-13943
URL: https://issues.apache.org/jira/browse/HDDS-13943
Project: Apache Ozone
Issue Type: Improvement
Reporter: Huang Guan Hao
Assignee: Huang Guan Hao
The `DirstreamClientHandler` directly accesses `parts[1]` after splitting
`currentFileName` without validating the split result length. While the
server-side protocol guarantees the format `SIZE FILENAME` (with space), the
client should validate input to handle network errors, protocol version
mismatches, malicious input, or implementation errors.
Currently, if the format is incorrect (e.g., no space), `split(" ", 2)` returns
an array of length 1, and accessing `parts[1]` throws
`ArrayIndexOutOfBoundsException`, which is not a user-friendly error.
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