Your message dated Thu, 13 Sep 2007 17:58:43 +0200 with message-id <[EMAIL PROTECTED]> and subject line Bug#442157: getaddrinfo() does not prefer IPv6 address over IPv4 one has caused the attached Bug report to be marked as done.
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--- Begin Message ---Package: libc6 Version: 2.3.6.ds1-13 Severity: important getaddrinfo() does not prefer IPv6 addresses, even though it should according to RFC 3484. I have debugged the issue and it all boils down to match_prefix() in sysdeps/posix/getaddrinfo.c. The prefix test runs like this: while (bits > 8) { if (*mask != *val) break; ++mask; ++val; bits -= 8; } if (bits < 8) { if ((*mask & (0xff00 >> bits)) == (*val & (0xff00 >> bits))) /* Match! */ break; } Of course, for prefix lengths which are a multiple of 8 the loop ends prematurely and the subsequent test returns 8, so there is never a match for these lengths. Since the prefix for IPv4 addresses is 96 bits long (see default_precedence), IPv4 addresses get the default priority (40) and not the correct one (10). I was able to fix this by changing the condition to: while (bits >= 8) Since match_prefix() is used for labels as well, this bug probably also breaks RFC 3484 rule 5 (Prefer matching label). -- System Information: Debian Release: 4.0 APT prefers stable APT policy: (500, 'stable') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.20.3 Locale: LANG=cs_CZ.UTF-8, LC_CTYPE=cs_CZ.UTF-8 (charmap=UTF-8) Versions of packages libc6 depends on: ii tzdata 2007b-1 Time Zone and Daylight Saving Time libc6 recommends no packages. -- no debconf information
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--- Begin Message ---Version: 2.4-1 Petr Tesarik a écrit : > Package: libc6 > Version: 2.3.6.ds1-13 > Severity: important > > getaddrinfo() does not prefer IPv6 addresses, even though it should > according to RFC 3484. I have debugged the issue and it all boils down > to match_prefix() in sysdeps/posix/getaddrinfo.c. The prefix test runs > like this: > > while (bits > 8) > { > if (*mask != *val) > break; > > ++mask; > ++val; > bits -= 8; > } > > if (bits < 8) > { > if ((*mask & (0xff00 >> bits)) == (*val & (0xff00 >> bits))) > /* Match! */ > break; > } > > Of course, for prefix lengths which are a multiple of 8 the loop ends > prematurely and the subsequent test returns 8, so there is never a match > for these lengths. Since the prefix for IPv4 addresses is 96 bits long > (see default_precedence), IPv4 addresses get the default priority (40) > and not the correct one (10). I was able to fix this by changing the > condition to: > > while (bits >= 8) > > Since match_prefix() is used for labels as well, this bug probably also > breaks RFC 3484 rule 5 (Prefer matching label). > This is fixed since glibc version 2.4-1. -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [EMAIL PROTECTED] | [EMAIL PROTECTED] `- people.debian.org/~aurel32 | www.aurel32.net
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