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Diffstat (limited to 'contrib/perl5/ext/Sys/Hostname/Hostname.pm')
| -rw-r--r-- | contrib/perl5/ext/Sys/Hostname/Hostname.pm | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/contrib/perl5/ext/Sys/Hostname/Hostname.pm b/contrib/perl5/ext/Sys/Hostname/Hostname.pm new file mode 100644 index 0000000..1efc897 --- /dev/null +++ b/contrib/perl5/ext/Sys/Hostname/Hostname.pm @@ -0,0 +1,153 @@ +package Sys::Hostname; + +use strict; + +use Carp; + +require Exporter; +use XSLoader (); +require AutoLoader; + +our @ISA = qw/ Exporter AutoLoader /; +our @EXPORT = qw/ hostname /; + +our $VERSION = '1.1'; + +our $host; + +XSLoader::load 'Sys::Hostname', $VERSION; + +sub hostname { + + # method 1 - we already know it + return $host if defined $host; + + # method 1' - try to ask the system + $host = ghname(); + return $host if defined $host; + + if ($^O eq 'VMS') { + + # method 2 - no sockets ==> return DECnet node name + eval { local $SIG{__DIE__}; $host = (gethostbyname('me'))[0] }; + if ($@) { return $host = $ENV{'SYS$NODE'}; } + + # method 3 - has someone else done the job already? It's common for the + # TCP/IP stack to advertise the hostname via a logical name. (Are + # there any other logicals which TCP/IP stacks use for the host name?) + $host = $ENV{'ARPANET_HOST_NAME'} || $ENV{'INTERNET_HOST_NAME'} || + $ENV{'MULTINET_HOST_NAME'} || $ENV{'UCX$INET_HOST'} || + $ENV{'TCPWARE_DOMAINNAME'} || $ENV{'NEWS_ADDRESS'}; + return $host if $host; + + # method 4 - does hostname happen to work? + my($rslt) = `hostname`; + if ($rslt !~ /IVVERB/) { ($host) = $rslt =~ /^(\S+)/; } + return $host if $host; + + # rats! + $host = ''; + Carp::croak "Cannot get host name of local machine"; + + } + elsif ($^O eq 'MSWin32') { + ($host) = gethostbyname('localhost'); + chomp($host = `hostname 2> NUL`) unless defined $host; + return $host; + } + elsif ($^O eq 'epoc') { + $host = 'localhost'; + return $host; + } + else { # Unix + # is anyone going to make it here? + + # method 2 - syscall is preferred since it avoids tainting problems + # XXX: is it such a good idea to return hostname untainted? + eval { + local $SIG{__DIE__}; + require "syscall.ph"; + $host = "\0" x 65; ## preload scalar + syscall(&SYS_gethostname, $host, 65) == 0; + } + + # method 2a - syscall using systeminfo instead of gethostname + # -- needed on systems like Solaris + || eval { + local $SIG{__DIE__}; + require "sys/syscall.ph"; + require "sys/systeminfo.ph"; + $host = "\0" x 65; ## preload scalar + syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1; + } + + # method 3 - trusty old hostname command + || eval { + local $SIG{__DIE__}; + local $SIG{CHLD}; + $host = `(hostname) 2>/dev/null`; # bsdish + } + + # method 4 - use POSIX::uname(), which strictly can't be expected to be + # correct + || eval { + local $SIG{__DIE__}; + require POSIX; + $host = (POSIX::uname())[1]; + } + + # method 5 - sysV uname command (may truncate) + || eval { + local $SIG{__DIE__}; + $host = `uname -n 2>/dev/null`; ## sysVish + } + + # method 6 - Apollo pre-SR10 + || eval { + local $SIG{__DIE__}; + my($a,$b,$c,$d); + ($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6); + } + + # bummer + || Carp::croak "Cannot get host name of local machine"; + + # remove garbage + $host =~ tr/\0\r\n//d; + $host; + } +} + +1; + +__END__ + +=head1 NAME + +Sys::Hostname - Try every conceivable way to get hostname + +=head1 SYNOPSIS + + use Sys::Hostname; + $host = hostname; + +=head1 DESCRIPTION + +Attempts several methods of getting the system hostname and +then caches the result. It tries the first available of the C +library's gethostname(), C<`$Config{aphostname}`>, uname(2), +C<syscall(SYS_gethostname)>, C<`hostname`>, C<`uname -n`>, +and the file F</com/host>. If all that fails it C<croak>s. + +All NULs, returns, and newlines are removed from the result. + +=head1 AUTHOR + +David Sundstrom E<lt>F<sunds@asictest.sc.ti.com>E<gt> + +Texas Instruments + +XS code added by Greg Bacon E<lt>F<gbacon@cs.uah.edu>E<gt> + +=cut + |
