when resolving dns records which have multiple values, three duplicate records are returned per actual value. That is: host.example.com IN A 1.2.3.4 host.example.com IN A 1.2.3.5 returns 1.2.3.4, 1.2.3.4, 1.2.3.4, 1.2.3.5, 1.2.3.5, 1.2.3.5 Reproducible: Always Steps to Reproduce: r = getaddrinfo ("www.yahoo.com", NULL, NULL, &res); for (rptr = res; rptr; rptr = rptr->ai_next) printf ("%s\n", inet_ntoa ( ((struct sockaddr_in *)rptr->ai_addr)->sin_addr)); freeaddrinfo (res); Actual Results: 146.186.218.253 146.186.218.253 146.186.218.253 66.92.68.246 66.92.68.246 66.92.68.246 66.115.130.4 66.115.130.4 66.115.130.4 66.187.233.4 66.187.233.4 66.187.233.4 128.95.231.7 128.95.231.7 128.95.231.7 204.17.42.202 204.17.42.202 204.17.42.202 216.165.129.244 216.165.129.244 216.165.129.244 64.115.129.106 64.115.129.106 64.115.129.106 205.142.198.4 205.142.198.4 205.142.198.4 209.126.142.251 209.126.142.251 209.126.142.251 209.132.176.4 209.132.176.4 209.132.176.4 63.73.218.130 63.73.218.130 63.73.218.130 65.75.183.220 65.75.183.220 65.75.183.220 65.125.233.206 65.125.233.206 65.125.233.206 67.129.68.9 67.129.68.9 67.129.68.9 Expected Results: 66.94.230.36 66.94.230.37 66.94.230.38 66.94.230.39 66.94.230.41 66.94.230.42 66.94.230.44 66.94.230.32 Portage 2.0.50-r8 (default-x86-1.4, gcc-3.3.3, glibc-2.3.3.20040420-r0, 2.4.25_pre7-gss-r5) =============================================================== == System uname: 2.4.25_pre7-gss-r5 i686 Intel(R) Xeon(TM) CPU 2.40GHz Gentoo Base System version 1.4.16 distcc 2.13 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632) [disabled] Autoconf: sys-devel/autoconf-2.59-r3 Automake: sys-devel/automake-1.8.3 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CFLAGS="-march=pentium3 -O3 -pipe" CHOST="i686-pc-linux-gnu" COMPILER="gcc3" CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config /usr/kde/3/share/config / usr/share/config /var/bind /var/qmail/control" CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" CXXFLAGS="-march=pentium3 -O3 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoaddcvs ccache sandbox" GENTOO_MIRRORS="http://gentoo.oregonstate.edu http://distro.ibiblio.org/pub/Linux/distributions/ gentoo" MAKEOPTS="-j5" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="" SYNC="rsync://rsync.namerica.gentoo.org/gentoo-portage" USE="X acpi apm arts avi berkdb crypt cups curl encode esd foomaticdb gdbm gif gnome gpm gtk gtk2 imlib innodb ipv6 jpeg kde ldap libg++ libwww mad mikmod mmx motif mpeg mysql ncurses nls oggvorbis opengl oss pam pdflib perl png python qt quicktime readline samba sdl slang spell ssl svga tcpd truetype x86 xml2 xmms xv zlib"
Resolution from another hostname with multiple values was shown in the erroneous output. The expected output has the proper addresses for the hostname quoted in the sample code. However, the expected wrong results do indeed occur (66.94.230.36 66.94.230.36 66.94.230.36..) Sorry for any confusion.
I can reproduce this bug on newer Debian machines now, indicating this is probably not a Gentoo specific bug. This bug should probably be forwarded to the glibc project.
seems to happen in an uclibc environment also ...
I don't think this is a bug at all. If you read the man page for getaddrinfo it says it will return one entry per host per protocol that can reach it. Try printing the socktype and protocol fields of the structs as well.
Agreed. Furthermore, passing AF_INET/SOCK_STREAM (or SOCK_DGRAM) to the hints field properly filters it.
ah, thanks guys for the feedback
