Bug#1067760: libc6: Curious behavior of inet_pton() on IPv4 mapped numbers

[Alessandro Vesely <vesely@tana.it>]

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:ffff:5:6:7:8
::ffff:5:6:7:8
$ ./a.out i6 0:0:0:ffff:5.6.7.8
Not in presentation format
$ ./a.out i6 0:0:0:0:0:ffff:5.6.7.8
::ffff: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  locales                2.36-9+deb12u4

-- debconf information excluded