Bug 176278
| Summary: | [patch] nc(1) incorrectly passes telnet option data through | ||||||
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| Product: | Base System | Reporter: | Paul Koch <paul.koch137> | ||||
| Component: | bin | Assignee: | freebsd-bugs (Nobody) <bugs> | ||||
| Status: | Open --- | ||||||
| Severity: | Affects Only Me | Keywords: | patch | ||||
| Priority: | Normal | ||||||
| Version: | Unspecified | ||||||
| Hardware: | Any | ||||||
| OS: | Any | ||||||
| Attachments: |
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Run /usr/bin/nc -t {ip} 23 Garbage characters appear in output. Run /usr/bin/nc -t {ip 23 | hexdump -C This will show something like the following at the start: ff fd 25 ff fb 26 ff fd ... The ff fd xx are telnet options which should be stripped from the output. Telnet options can occur pretty much at any time during the session, so garbage chars will probably also appear in other places of the output. Fix: The telnet command opt processing in netcat.c is fairly crude. Strip the telnet options from the output buffer. Patch attached with submission follows: How-To-Repeat: Run nc command as above.