https://bugs.winehq.org/show_bug.cgi?id=50499
Bug ID: 50499 Summary: SO_REUSEADDR compatibility problems Product: Wine Version: 6.0-rc6 Hardware: x86-64 OS: Linux Status: UNCONFIRMED Severity: normal Priority: P2 Component: -unknown Assignee: wine-bugs@winehq.org Reporter: James@superbug.co.uk Distribution: ---
The use case I am struggling with is the use of a Windows program running in wine that is sending and receiving UDP packets. This particular windows program uses SO_REUSEADDR socket option and opens two sockets. Lets call the first one socket A, and the second one Socket B.
The SO_REUSEADDR from the Windows application is translated by "wine" into a SO_REUSEADDR in Linux. Unfortunately the behaviour of these is different between Windows and Linux so the Windows application fails to run on Linux under wine. 1 ) On windows: All received unicast UDP packets will arrive on the first opened socket. Thus on socket A. 2) On Linux: All received unicast UDP packets will arrive on the last opened socket. Thus on socket B.
The problem is that this windows program only expects to receive unicast UDP packets on socket A, and thus it sees no packets.
There are no currently existing socket options in Linux that would permit wine to simulate the Windows behaviour. And thus, the reason I am asking the question here. Please can we add an extra socket option to the Linux socket options such that we can get wine to simulate Windows correctly. I.e. behave like (1) above. Now wine is pretty good at simulating most things Windows throws at it, but socket options is not one of them yet. Also note, that (1) is actually more secure than (2) because it prevents other applications with the same UserID from hijacking the socket. Although (2) is more helpful in more gracefully handling some error edge cases.
Suggested new option name: SO_REUSEADDR_WS