Package: libc6 Version: 2.1.2-10 Security: Important Even on IPv6 capable hosts, the getaddrinfo() function (defined in RFC2553) with PF_UNSPEC hints returns EAI_NODATA error if the target host has only AAAA record(s). In this case, it SHOULD return IPv6 addresses from AAAA record(s) (on IPv6 capable hosts at least).
If PF_INET6 is given to getaddrinfo() as its "hints" argument, it will find AAAA record(s). But this "ad hoc" solution is very imcompatible with other IPv6 stack (such as FreeBSD + KAME) and breaks pure protocol independent programming model. Similar report is already done in debian-ipv6 ML <http://www.debian.org/Lists-Archives/debian-ipv6-9911/msg00011.html> but no records about this did not found in BTS. This report is to record the problem to much more public space. Note: After I copied /lib/libc-2.1.2.so from other Debian 2.1.2-5 box to my 2.1.2-10 box, it works fine. (This is dangerous test.) The test program: /* gaitest.c */ #include <stdio.h> #include <sys/socket.h> #include <netdb.h> struct AList{ int type; char *name; }; struct AList sock_alist[] = { { 0, "Unspecified" }, { SOCK_STREAM, "SOCK_STREAM" }, { SOCK_DGRAM, "SOCK_DGRAM" }, { -1, NULL } }; int main(int argc, char *argv[]){ char *name = "localhost"; char *service = NULL; struct addrinfo hints, *ai; int j; int status; if (argc>1) name = argv[1]; if (argc>2) service = argv[2]; ai=NULL; printf ("getaddrinfo(\"%s\",\"%s\",&hints,&ai)\n", name, service); for(j=0; sock_alist[j].name; j++){ memset(&hints,sizeof(hints),0); hints.ai_flags = 0; hints.ai_family = PF_UNSPEC; hints.ai_socktype = sock_alist[j].type; status = getaddrinfo(name,service,&hints,&ai); printf ("\tsocktype=%d(%s): %d = %s\n", sock_alist[j].type, sock_alist[j].name, status, (status ? gai_strerror(status) : "ok") ); if(ai){ freeaddrinfo(ai);} } return (0); } ---- The results on libc6-2.1.2-10 machine (buggy): |% nslookup -q=any pandora.ipv6.debian.org : |Non-authoritative answer: |pandora.ipv6.debian.org IPv6 address = 3ffe:600:8000:8::32 : |% ./gaitest pandora.ipv6.debian.org |getaddrinfo("pandora.ipv6.debian.org","(null)",&hints,&ai) | socktype=0(Unspecified): -5 = No address associated with hostname | socktype=1(SOCK_STREAM): -5 = No address associated with hostname | socktype=2(SOCK_DGRAM): -5 = No address associated with hostname |% ./gaitest pandora.ipv6.debian.org 80 |getaddrinfo("pandora.ipv6.debian.org","80",&hints,&ai) | socktype=0(Unspecified): -8 = Servname not supported for ai_socktype | socktype=1(SOCK_STREAM): -5 = No address associated with hostname | socktype=2(SOCK_DGRAM): -5 = No address associated with hostname On libc6-2.1.2-5 machine (seems ok): |% ./gaitest pandora.ipv6.debian.org |getaddrinfo("pandora.ipv6.debian.org","(null)",&hints,&ai) | socktype=0(Unspecified): 0 = ok | socktype=1(SOCK_STREAM): 0 = ok | socktype=2(SOCK_DGRAM): 0 = ok |./gaitest pandora.ipv6.debian.org 80 |getaddrinfo("pandora.ipv6.debian.org","80",&hints,&ai) | socktype=0(Unspecified): -8 = Servname not supported for ai_socktype | socktype=1(SOCK_STREAM): 0 = ok | socktype=2(SOCK_DGRAM): 0 = ok Thanks. Desired=Unknown/Install/Remove/Purge | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-===============-==============-============================================ ii libc6 2.1.2-10 GNU C Library: Shared libraries and timezone -- Hideaki YOSHIFUJI <[EMAIL PROTECTED]> Web Page: http://www.ecei.tohoku.ac.jp/%7Eyoshfuji/ PGP5i FP: F731 6599 5EB2 BBA7 1515 1323 1806 A96F 5700 6B25
