Ping hosts to distinguish off-line cases

Off-line report can be caused by the service being down
or by the host being unreachable.  Pings each host
before attempting to connect to the service.

acme_token_check.1

@@ -55,7 +55,7 @@
 .\" ========================================================================
 .\"
 .IX Title "ACME_TOKEN_CHECK 1"
-.TH ACME_TOKEN_CHECK 1 22-Mar-2024 "" "Certificate Tools"
+.TH ACME_TOKEN_CHECK 1 29-Jun-2024 "" "Certificate Tools"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l

ssl_status

@@ -4,7 +4,7 @@ use warnings;
 use strict;
 
 my $copyright = << 'COPYRIGHT';
-Copyright (C) 2021 - 2023 Timothe Litt <litt at acm.org>
+Copyright (C) 2021 - 2024 Timothe Litt <litt at acm.org>
 Use --man for license information.
 COPYRIGHT
 
@@ -24,6 +24,7 @@ use File::Spec;
 use File::Temp;
 use Getopt::Long( qw/GetOptionsFromString :config bundling/ );
 use IO::Socket::IP;
+use Net::Ping;
 use POSIX( qw/mktime strftime/ );
 use Sys::Hostname;
 use Text::Abbrev;
@@ -53,6 +54,7 @@ sub formatVersion {
 my $tmpdir = File::Spec->tmpdir || '.';
 
 my $ostype = eval { require Perl::OSType; return Perl::OSType::os_type() } || 'Unix';
+my $ping   = Net::Ping->new( 'icmp', 5, 64 );
 my $havepss;
 
 # Duplicate / @loop detection
@@ -590,6 +592,21 @@ sub checkhost {
         return analyzeChain( [ $host, $port ], $chain, $haskey, $opts, $at, $atl );
     }
 
+    {
+        my( $h, $p ) = split( /:/, $host, 2 );
+        my @sts = $ping->ping( $h, 5 );
+        unless( @sts ) {
+            printf STDERR ( "Invalid host name '$h'\n" ) if( $debug );
+            missingcert( $host, $port, [''], 'OFFLINE', "Invalid name or address" );
+            return;
+        }
+        unless( $sts[0] ) {
+            printf STDERR ( "No ping response from '$h' ($sts[2])\n" ) if( $debug );
+            missingcert( $host, $port, [''], 'OFFLINE', "No ping response $sts[2]" );
+            return;
+        }
+    }
+
     foreach my $type ( @{ $opts->{type} } ) {
         my $cmd = "openssl s_client $opts->{CAcerts} $opts->{starttls}[0] -showcerts " .
             "$opts->{tlsversion}[0] $type->[0] -connect $host";

ssl_status.1

@@ -55,7 +55,7 @@
 .\" ========================================================================
 .\"
 .IX Title "SSL_STATUS 1"
-.TH SSL_STATUS 1 21-Mar-2024 "" "Certificate Tools"
+.TH SSL_STATUS 1 29-Jun-2024 "" "Certificate Tools"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l