Bug 1944131
| Summary: | netcat does not properly terminate on EOF (nmap-ncat works well) | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Jakub Jelen <jjelen> |
| Component: | netcat | Assignee: | Robert Scheck <redhat-bugzilla> |
| Status: | CLOSED EOL | QA Contact: | |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 34 | CC: | redhat-bugzilla |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-06-08 06:28:16 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
Jakub Jelen
2021-03-29 11:20:47 UTC
This particular use case is even described in the manual page of netcat:
> The connection may be terminated using an EOF (‘^D’).
(assuming the echo/bash sends the EOF correctly to the netcat)
I am not sure whether I can address this, because like /usr/sbin/sendmail is not a 100% alternative when using Postfix, Exim etc. rather Sendmail itself, it's similar for /usr/bin/nc. Same situation also applies e.g. for /usr/bin/ksh regarding ksh93 or mksh. In case a software relies on a specific behaviour it IMHO should use the specific implementation directly (e.g. ncat) rather via the alternatives symlink (nc). Your report however brings me to the question whether you installed netcat yourself explicitly or whether it happened by accident (sloppy package dependency or packaging mistake etc.). The intention was to provide the original OpenBSD netcat additionally for those who want it, not to break everybody's scripts, behaviour etc. by default (like the hard and mostly by Red-Hat-driven switch from the original "nc" RPM package to "nmap-ncat" like 5+ years ago did). Indeed, I am not striving for 100% compatibility, but I would like to have the a use case which is described in the manual page of the new netcat package working (as mentioned in the comment #1). The dependency in a test I had was written just as a "nc" and in one system, where the nmap-ncat was installed, the above worked just fine, but in other system where nothing was installed, the netcat got a preference for some reason, which might cause some problems for some users. Not sure how the alternatives preferences and such work in detail though. This message is a reminder that Fedora Linux 34 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 34 on 2022-06-07. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '34'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 34 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed. Fedora Linux 34 entered end-of-life (EOL) status on 2022-06-07. Fedora Linux 34 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. Thank you for reporting this bug and we are sorry it could not be fixed. |