On Nov 25, 2009 at 14:04, marius zbihlei <[email protected]> wrote: > Hello, > > I have seen that sip-router (and also kamailio) uses the old > gethostbyname()/gethostbyname2() (for IPv6) method of resolving hostnames.
In general sr uses its own dns cache. gethostbyname() is used only if compiled without dns cache support and from some modules. > > These calls have been deprecated according to the POSIX 2001 standard > these calls are obsolete: Quote from the gethostbyname manpage They might be deprecated, but they are still the most portable way of doing dns lookups. > > "POSIX.1-2001 marks *gethostbyaddr*() and *gethostbyname*() obsolescent. > See *getaddrinfo <http://linux.die.net/man/3/getaddrinfo>*(3), > *getnameinfo <http://linux.die.net/man/3/getnameinfo>*(3), *gai_strerror > <http://linux.die.net/man/3/gai_strerror>*(3). " > (http://linux.die.net/man/3/gethostbyname) > > How about changing these calls to the new and improved API(getaddrinfo)? > > Some benefits of using the getaddrinfo API: > > 1. Thread safe calls (also async-sig-safe) We don't care about that (we don't have threads and we don't use them from signal handlers). > 2. IPv4/IPv6 compliant same goes for gethostbyname2 or getipnodebyname (solaris). > 3. Order or returned addresses conforming to RFC 3484 (private network > address returned first) (http://udrepper.livejournal.com/16116.html) > > For a more complete description of the differences , I point to Urlich > Drepper's excelent article: > > http://people.redhat.com/drepper/userapi-ipv6.html > > Any benefits from using these calls? Any problems from removing the old > calls? I don't see any benefits in changing, only possible portability problems. Andrei _______________________________________________ sr-dev mailing list [email protected] http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
