Date: Sun, 26 Feb 2006 01:46:30 +0200 From: Rostislav Krasny <rosti.bsd@gmail.com> To: Hajimu UMEMOTO <ume@freebsd.org> Cc: freebsd-stable@freebsd.org, freebsd-stable-local@be-well.ilk.org, yar@comp.chem.msu.su, dwmalone@maths.tcd.ie, des@des.no, mak@ll.mit.edu, MH@kernel32.de Subject: Re: SSH login takes very long time...sometimes Message-ID: <20060226014630.cc0b04ab.rosti.bsd@gmail.com> In-Reply-To: <ygek6bje6h3.wl%ume@mahoroba.org> References: <20060218012029.e146e2ff.rosti.bsd@gmail.com> <20060219104912.GB20500@comp.chem.msu.su> <20060219225701.0e3e244b.rosti.bsd@gmail.com> <20060221165959.GB77513@comp.chem.msu.su> <20060222024430.ad4b5c60.rosti.bsd@gmail.com> <yge1wxvz5ha.wl%ume@mahoroba.org> <20060223235727.33cddb13.rosti.bsd@gmail.com> <ygefym98o7i.wl%ume@mahoroba.org> <20060224155153.f7da1a52.rosti.bsd@gmail.com> <ygewtfkelbu.wl%ume@mahoroba.org> <20060224174007.GF36227@comp.chem.msu.su> <20060225024246.d6284719.rosti.bsd@gmail.com> <ygeslq7ew25.wl%ume@mahoroba.org> <20060225164648.a4eed65c.rosti.bsd@gmail.com> <ygek6bje6h3.wl%ume@mahoroba.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, 26 Feb 2006 01:41:28 +0900 Hajimu UMEMOTO <ume@freebsd.org> wrote: > Hi, > > >>>>> On Sat, 25 Feb 2006 16:46:48 +0200 > >>>>> Rostislav Krasny <rosti.bsd@gmail.com> said: > > rosti> "family = his_addr.su_family;" is really a good idea. But what is the > rosti> reason to check if IPv6 address of a remote client is IPv4 mapped and > rosti> assign AF_INET to a 'family' when that's true? The inithosts() doesn't > rosti> lookup for that address but for the server's hostname and optionally > rosti> virtual server's hostnames from /etc/ftphosts. I think it's unnecessary > rosti> and can even produce problems. IMHO "inithosts(family);" could be > rosti> called right after the "family = his_addr.su_family;" line. > > No, when a local address of a connection is an IPv4-mapped IPv6 > address, selecthost() does test it as a native IPv4 address. So, we > need to lookup hostnames as an IPv4 in inithosts(). Please refer > selecthost() for detail. As far as I understand the code of selecthost() it walks through linked lists of known virtual hosts and their addresses and compares the addresses to a local address of connected socket. This way it tries to find - configuration of what virtual host should be used. There is an additional comparison that seems like a workaround for misconfigured virtual host that can be resolved only to IPv4 address and should be used on IPv4-mapped IPv6 address. If virtual hosts are properly configured that hack is not needed, IMHO. Anyway selecthost() is called with local socket name and it checks a local address, while his_addr.su_sin6.sin6_addr is a remote address. Local and remote hosts have same address families but not same addresses.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20060226014630.cc0b04ab.rosti.bsd>