| Ticket UUID: | 3288977 | |||
| Title: | client hangs on bad multi-line server responses | |||
| Type: | Bug | Version: | None | |
| Submitter: | szinck | Created on: | 2011-04-18 18:14:58 | |
| Subsystem: | ftp | Assigned To: | andreas_kupries | |
| Priority: | 5 Medium | Severity: | ||
| Status: | Closed | Last Modified: | 2011-04-19 02:27:41 | |
| Resolution: | Accepted | Closed By: | andreas_kupries | |
| Closed on: | 2011-04-18 19:27:41 | |||
| Description: |
If the server doesn't speak strict RFC-959 when it comes to multi-line responses, it can cause the client to hang.
For example, this was causing Tcllib ftp code to have an infinite loop and eat 100% cpu.
RETR blah
150 Opening BINARY mode data connection for blah (180 bytes).
226 Transfer complete.
QUIT
221-You have transferred 180 bytes in 1 files.
^^^ notice no "221 Goodbye."
Most likely the network I was using was dropping the last couple of packets after the client said QUIT, that included the "221 Goodbye" response that the code was waiting for.
This is the same issue described in the latter half of 2813069. I couldn't upload files to it, so I created a new bug and have attached a patch.
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| User Comments: |
andreas_kupries added on 2011-04-19 02:27:41:
allow_comments - 1 Committed to CVS head. Bumped version to 2.4.10. szinck added on 2011-04-19 01:14:59: File Added - 409172: ftp-multiline-reply-infinite-loop.patch | |||
Attachments:
- ftp-multiline-reply-infinite-loop.patch [download] added by szinck on 2011-04-19 01:14:59. [details]