On Aug 31, 2010, at 12:04 PM, Robert Watson wrote: > > On Sun, 29 Aug 2010, Andre Oppermann wrote: > >> When T/TCP RFC1644 support was introduced in r6283 by wollman 15 years ago >> the semantics of sendto(2) with regard to TCP sockets were changed. >> >> It became possible directly do a sendto(2) call with the target address in >> the *to argument instead of doing a connect(2) first and subsequent write(2) >> or send(2) calls as the standard TCP API specifies. Optionally MSG_EOR >> could be specified to close the connection again right again after the data >> has been sent out. >> >> This is totally non-portable and no other OS (Linux, NetBSD, OpenBSD, >> Solaris, HP-UX) ever supported this functionality for TCP sockets. FreeBSD >> was the only OS to ever ship this. >> >> T/TCP was ill-defined and had major security issues and never gained any >> support. It has been defunct in FreeBSD and most code has been removed about >> 6 years ago. The sendto(2) extended functionality is one of the last parts >> that persisted and remained around living a zombie life. >> >> I want to remove it now because it is totally non-portable, has no known >> users and complicates the TCP send path. The patch is attached. >> >> If you have any objections speak up now. > > I'm not entirely comfortable with this change, and would like a chance to > cogitate on it a bit more. While I'm not aware of any applications depending > on the semantic for TCP, I know that we do use it for UNIX domain sockets. > Since it's a documented API, if we are going to remove it, then we need to go > through a deprecation process, not least by marking it as a deprecated API in > 8.x before having it vanish in 9.0. sendto() is also used for SCTP SOCK_STREAMS and SOCK_SEQPACKET sockets...
Best regards Michael > > (I won't be sorry to see the complexity go, but I'm not sure I have all the > implications in mind as yet...) > > Robert > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" > _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
