[perl #24198] Bad default-domainname extraction in Configure-Script may cause infinite loops in perl-tests

# New Ticket Created by  Henning Rust 
# Please include the string:  [perl #24198]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=24198 >


This is a bug report for perl from hrust@stud.uni-hannover.de,
generated with the help of perlbug 1.34 running under perl v5.8.0.


-----------------------------------------------------------------
[Please enter your report here]

The "Configure" Script attempts to extract the host's domainname default
value from a resolv.conf file, if all other ways fail. This is done by
scanning the resolv.conf file for any lines containing "search <domainname>"

If there are more than one "search <domainname>" line, e.g.:

search foo.bar.com
search bar.com

the default domainname value will be extracted as:

"foo.bar.com
bar.com"

i.e.: values from *both* "search <domainname>" lines, separated by
a CR-Character!!

If using default values (as Gentoo Linux does it), Configure will generate
a config.sh file that contains entries such as:

mydomain='.foo.bar.com
bar.com'

and

cf_email='user@foo.bar.com
bar.com'

i.e. CR-Characters within quoted string-constants.

- which causes Config::NEXTKEY in lib/Config.pm to fail to correctly
  locate the quote-characters.
- which causes Config::NEXTKEY to never reach its terminate condition
  (len == 0)
- which causes an infinite loop for every use of "keys %Config"
- which causes lib/Config.t (and maybe other tests as well ) to hang
  in an infinite loop.
- which causes trouble to unexperienced Gentoo-Linux-Users as it is
  not so easy to track down and work around the problem...

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=install
    severity=low
---
Site configuration information for perl v5.8.0:

Configured by jey at Mon Oct 13 13:05:13 CEST 2003.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.4.20-gentoo-r7, archname=i686-linux
    uname='linux inspiron 2.4.20-gentoo-r7 #13 thu oct 2 19:00:03 cest 2003 i686 intel(r) celeron(r) cpu 2.20ghz genuineintel gnulinux '
    config_args='-des -Darchname=i686-linux -Dcc=gcc -Dprefix=/usr -Dvendorprefix=/usr -Dsiteprefix=/usr -Dlocincpth=  -Doptimize=-O3 -march=pentium2 -O3 -pipe -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Dscriptdir=/usr/bin -Dman3ext=3pm -Dcf_by=Gentoo -Ud_csh -Di_gdbm -Di_db -Di_ndbm'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-DPERL5 -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3 -march=pentium2 -O3 -pipe',
    cppflags='-DPERL5 -DPERL5 -fno-strict-aliasing'
    ccversion='', gccversion='3.2.3 20030422 (Gentoo Linux 1.4 3.2.3-r2, propolice)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lpthread -lnsl -lndbm -lgdbm -ldb -ldl -lm -lc -lcrypt -lutil
    perllibs=-lpthread -lnsl -ldl -lm -lc -lcrypt -lutil
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:


---
@INC for perl v5.8.0:
    /etc/perl
    /usr/lib/perl5/site_perl/5.8.0/i686-linux
    /usr/lib/perl5/site_perl/5.8.0
    /usr/lib/perl5/site_perl
    /usr/lib/perl5/vendor_perl/5.8.0/i686-linux
    /usr/lib/perl5/vendor_perl/5.8.0
    /usr/lib/perl5/vendor_perl
    /usr/lib/perl5/5.8.0/i686-linux
    /usr/lib/perl5/5.8.0
    /usr/local/lib/site_perl
    .

---
Environment for perl v5.8.0:
    HOME=/root
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/3.2:/opt/Acrobat5:/usr/X11R6/bin:/opt/blackdown-jdk-1.4.1/bin:/opt/blackdown-jdk-1.4.1/jre/bin:/usr/qt/3/bin:/usr/kde/3.1/sbin:/usr/kde/3.1/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

hepp..
        Henning

--
henning@uni.de

• [perl #24198] Bad default-domainname extraction in Configure-Script may cause infinite loops in perl-tests by Henning Rust
• Re: [perl #24198] Bad default-domainname extraction in Configure-Script may cause infinite loops in perl-tests by Slaven Rezic
• Re: [perl #24198] Bad default-domainname extraction in Configure-Script may cause infinite loops in perl-tests by Andy Dougherty