Bug#1067760: libc6: Curious behavior of inet_pton() on IPv4 mapped numbers
On Tue 26/Mar/2024 20:14:27 +0100 Aurelien Jarno wrote: On 2024-03-26 12:53, Alessandro Vesely wrote: Package: libc6 Version: 2.36-9+deb12u4 Severity: normal Tags: ipv6 Dear Maintainer, I compiled the example program given in the inet_pton(3) man page, and obtain the following: $ ./a.out i6 0:0:0::5:6:7:8 :::5:6:7:8 $ ./a.out i6 0:0:0::5.6.7.8 Not in presentation format $ ./a.out i6 0:0:0:0:0::5.6.7.8 :::5.6.7.8 Could you please tell me what do you find curious and what do you expect instead? Thanks. Yeah, sorry about that. I counted one word per tag, irrespective of it being hex or decimal. So, for the last case I though heck, 10 tag is 160-bit. I was so persuaded that, when Bastian told me the 8-word "0:0:0::5.6.7.8" is not valid I went to RFC 4291 and when I read there that the 10-tag IP 0:0:0:0:0:0:13.1.68.3 is valid, I started filling an errata against it. I copied the following passage with the idea of correcting it by removing a couple of "x"s. 3. An alternative form that is sometimes more convenient when dealing with a mixed environment of IPv4 and IPv6 nodes is x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values of the six high-order 16-bit pieces of the address, and the 'd's are the decimal values of the four low-order 8-bit pieces of the address (standard IPv4 representation). Only at that point I read the text carefully and realized how mistaken I was. I aborted the errata submission, of course. But for the bug report, which I had already sent, I can only apologize. Best Ale
Bug#1067760: libc6: Curious behavior of inet_pton() on IPv4 mapped numbers
Hi, Thanks for your bug report. On 2024-03-26 12:53, Alessandro Vesely wrote: > Package: libc6 > Version: 2.36-9+deb12u4 > Severity: normal > Tags: ipv6 > > Dear Maintainer, > > I compiled the example program given in the inet_pton(3) man page, and obtain > the following: > > $ ./a.out i6 0:0:0::5:6:7:8 > :::5:6:7:8 > $ ./a.out i6 0:0:0::5.6.7.8 > Not in presentation format > $ ./a.out i6 0:0:0:0:0::5.6.7.8 > :::5.6.7.8 Could you please tell me what do you find curious and what do you expect instead? Thanks. Regards Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurel...@aurel32.net http://aurel32.net
Bug#1067760: libc6: Curious behavior of inet_pton() on IPv4 mapped numbers
On Tue 26/Mar/2024 17:34:20 +0100 Bastian Blank wrote: On Tue, Mar 26, 2024 at 12:53:42PM +0100, Alessandro Vesely wrote: I compiled the example program given in the inet_pton(3) man page, and obtain the following: $ ./a.out i6 0:0:0::5.6.7.8 Not in presentation format This is no valid IPv6 address. Oops, you're right. Sorry for the confusion. Where did you find that? We were discussing a regex to catch all (valid) IP addresses when someone noted that leading zeroes are valid, albeit not the RFC 5952 recommended format. It's overly tricky for me. Best Ale
Bug#1067760: libc6: Curious behavior of inet_pton() on IPv4 mapped numbers
On Tue, Mar 26, 2024 at 12:53:42PM +0100, Alessandro Vesely wrote: > I compiled the example program given in the inet_pton(3) man page, and obtain > the following: > $ ./a.out i6 0:0:0::5.6.7.8 > Not in presentation format This is no valid IPv6 address. Where did you find that? Bastian -- "Get back to your stations!" "We're beaming down to the planet, sir." -- Kirk and Mr. Leslie, "This Side of Paradise", stardate 3417.3
Bug#1067760: libc6: Curious behavior of inet_pton() on IPv4 mapped numbers
Package: libc6 Version: 2.36-9+deb12u4 Severity: normal Tags: ipv6 Dear Maintainer, I compiled the example program given in the inet_pton(3) man page, and obtain the following: $ ./a.out i6 0:0:0::5:6:7:8 :::5:6:7:8 $ ./a.out i6 0:0:0::5.6.7.8 Not in presentation format $ ./a.out i6 0:0:0:0:0::5.6.7.8 :::5.6.7.8 Best Ale -- System Information: Debian Release: 12.0 merged-usr: no Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.1.0-18-amd64 (SMP w/8 CPU threads; PREEMPT) Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /bin/bash Init: sysvinit (via /sbin/init) Versions of packages libc6 depends on: ii libgcc-s1 12.2.0-14 Versions of packages libc6 recommends: ii libidn2-0 2.3.3-1+b1 Versions of packages libc6 suggests: ii debconf [debconf-2.0] 1.5.82 ii glibc-doc 2.36-9+deb12u4 ii libc-l10n 2.36-9+deb12u4 ii libnss-nis 3.1-4 ii libnss-nisplus 1.3-4 ii locales2.36-9+deb12u4 -- debconf information excluded
