+checkhello

diff --git a/bin/checkhello b/bin/checkhello
new file mode 100755 (executable)
index 0000000..c6eba95
--- /dev/null
+++ b/bin/checkhello
@@ -0,0 +1,67 @@
+#! /usr/bin/perl
+use strict;
+use warnings;
+use IO::Socket::INET6;
+use Time::HiRes qw(sleep);
+@ARGV==5 or die "$0 <hostname> <port> <string> <timeout> <tries>";
+my($hostname,$port,$string,$timeout,$tries)=@ARGV;
+for our $try (1..$tries) {
+  sub ts() {
+    return localtime()." PID=$$ #$try: ";
+  }
+  warn ts()."connect($hostname,$port)...\n";
+  my $sock=IO::Socket::INET6->new(
+      "Proto"   =>"tcp",
+      "PeerAddr"=>$hostname,
+      "PeerPort"=>$port,
+  );
+  if (!$sock) {
+    warn ts()."connect($hostname,$port)=$!";
+    sleep $timeout;
+    next;
+  }
+  warn ts()."connect($hostname,$port): done.\n";
+  my $buf="";
+  my $remains=$timeout;
+  while ($remains>0) {
+    my $rin="";
+    vec($rin,fileno($sock),1)=1;
+    my($nfound,$timeleft)=select($rin,"",$rin,$remains);
+    die "select nfound=$nfound: $!" if $nfound<0;
+    die "select timeleft=$timeleft" if $timeleft<0;
+    $remains=$timeleft;
+    if (!$nfound) {
+      $remains==0 or die "remains=$remains";
+      last;
+    }
+    my $c;
+    my $got=sysread $sock,$c,1;
+    my $fail;
+    if (!defined $got) {
+      warn ts()."sysread: $!";
+      $fail=1;
+    }
+    if ($got==0) {
+      warn ts()."sysread: EOF";
+      $fail=1;
+    }
+    if (!$fail) {
+      $got==1 or die "sysread=$got!=1";
+      length($c)==1 or die "sysread->c=".length($c)."!=1";
+      $buf.=$c;
+    }
+    last if length($buf)>=length($string);
+#    warn ts()."remains=<$remains> buf=<$buf>\n";
+    last if $fail;
+  }
+  close $sock or warn ts()."close: $!";
+  if ($buf eq $string) {
+    warn ts()."PASS\n";
+    print "PASS\n";
+    exit 0;
+  }
+  warn ts()."buf=<$buf>, sleep $remains";
+  sleep $remains or warn ts()."sleep=$!";
+}
+warn ts()."FAIL\n";
+print "FAIL\n";