/usr/share/perl5/MHA/SSHCheck.pm is in mha4mysql-manager 0.53-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | #!/usr/bin/env perl
# Copyright (C) 2011 DeNA Co.,Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
package MHA::SSHCheck;
use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Getopt::Long qw(:config pass_through);
use Carp qw(croak);
use Time::HiRes qw( sleep );
use Log::Dispatch;
use Log::Dispatch::Screen;
use Parallel::ForkManager;
use MHA::Config;
use MHA::ManagerConst;
use MHA::ManagerUtil;
$| = 1;
my $g_global_config_file = $MHA::ManagerConst::DEFAULT_GLOBAL_CONF;
my $g_config_file;
sub do_ssh_connection_check {
my $servers_ref = shift;
my $log = shift;
my $log_level = shift;
my $workdir = shift;
my @servers = @$servers_ref;
$log->info("Starting SSH connection tests..");
my $failed = 0;
my $pm = new Parallel::ForkManager( $#servers + 1 );
$pm->run_on_start(
sub {
my ( $pid, $target ) = @_;
}
);
$pm->run_on_finish(
sub {
my ( $pid, $exit_code, $target ) = @_;
return if ( $target->{skip_init_ssh_check} );
my $local_file =
"$workdir/$target->{ssh_host}_$target->{ssh_port}_ssh_check.log";
if ($exit_code) {
$failed = 1;
$log->error( "\n" . `cat $local_file` );
}
else {
$log->debug( "\n" . `cat $local_file` );
}
unlink $local_file;
}
);
foreach my $src (@servers) {
if ( $pm->start($src) ) {
# By default, sshd normally accepts only 10 concurrent authentication requests.
# If we have lots of alive servers, we might reach this limitation so
# shifting child process invocation time a bit to avoid this problem.
sleep 0.5;
next;
}
my ( $file, $pplog );
eval {
$SIG{INT} = $SIG{HUP} = $SIG{QUIT} = $SIG{TERM} = "DEFAULT";
$pm->finish(0) if ( $src->{skip_init_ssh_check} );
$file = "$workdir/$src->{ssh_host}_$src->{ssh_port}_ssh_check.log";
unlink $file;
$pplog = Log::Dispatch->new( callbacks => $MHA::ManagerConst::log_fmt );
$pplog->add(
Log::Dispatch::File->new(
name => 'file',
filename => $file,
min_level => $log_level,
callbacks => $MHA::ManagerConst::add_timestamp,
mode => 'append'
)
);
foreach my $dst (@servers) {
next if ( $dst->{skip_init_ssh_check} );
next if ( $src->{id} eq $dst->{id} );
$pplog->debug(
" Connecting via SSH from $src->{ssh_user}\@$src->{ssh_host}($src->{ssh_ip}:$src->{ssh_port}) to $dst->{ssh_user}\@$dst->{ssh_host}($dst->{ssh_ip}:$dst->{ssh_port}).."
);
my $command =
"ssh $MHA::ManagerConst::SSH_OPT_CHECK -p $src->{ssh_port} $src->{ssh_user}\@$src->{ssh_ip} \"ssh $MHA::ManagerConst::SSH_OPT_CHECK -p $dst->{ssh_port} $dst->{ssh_user}\@$dst->{ssh_ip} exit 0\"";
my ( $high, $low ) = MHA::ManagerUtil::exec_system( $command, $file );
if ( $high != 0 || $low != 0 ) {
$pplog->error(
"SSH connection from $src->{ssh_user}\@$src->{ssh_host}($src->{ssh_ip}:$src->{ssh_port}) to $dst->{ssh_user}\@$dst->{ssh_host}($dst->{ssh_ip}:$dst->{ssh_port}) failed!"
);
$pm->finish(1);
}
$pplog->debug(" ok.");
}
$pm->finish(0);
};
if ($@) {
$pplog->error($@) if ($pplog);
undef $@;
$pm->finish(1);
}
}
$pm->wait_all_children;
croak "SSH Configuration Check Failed!\n" if ($failed);
$log->info("All SSH connection tests passed successfully.");
}
sub main {
@ARGV = @_;
GetOptions(
'global_conf=s' => \$g_global_config_file,
'conf=s' => \$g_config_file,
);
unless ($g_config_file) {
print "--conf=<server_config_file> must be set.\n";
return 1;
}
my $log = MHA::ManagerUtil::init_log();
my $conf = new MHA::Config(
logger => $log,
globalfile => $g_global_config_file,
file => $g_config_file
);
my @servers_config = $conf->read_config();
$log = MHA::ManagerUtil::init_log( undef, "debug" );
return do_ssh_connection_check( \@servers_config, $log, "debug", "/tmp" );
}
1;
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