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stmt |
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cond |
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pod |
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code |
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package XAS::Lib::SSH::Client; |
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3
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our $VERSION = '0.01'; |
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5
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1
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1
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860
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use IO::Select; |
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1
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use Errno 'EAGAIN'; |
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use Net::SSH2 ':all'; |
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0
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use XAS::Class |
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debug => 0, |
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version => $VERSION, |
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base => 'XAS::Base', |
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mixin => 'XAS::Lib::Mixins::Bufops', |
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accessors => 'ssh chan sock select exit_code exit_signal', |
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mutators => 'attempts', |
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utils => ':validation dotid trim', |
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import => 'class', |
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vars => { |
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PARAMS => { |
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-port => { optional => 1, default => 22 }, |
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-timeout => { optional => 1, default => 0.2 }, |
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-username => { optional => 1, default => undef}, |
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-host => { optional => 1, default => 'localhost' }, |
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-eol => { optional => 1, default => "\015\012" }, |
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-password => { optional => 1, default => undef, depends => [ 'username' ] }, |
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-priv_key => { optional => 1, default => undef, depends => [ 'pub_key', 'username' ] }, |
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-pub_key => { optional => 1, default => undef, depends => [ 'priv_key', 'username' ] }, |
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}, |
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ERRNO => 0, |
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ERRSTR => '', |
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} |
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; |
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#use Data::Dumper; |
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36
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# ---------------------------------------------------------------------- |
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# Public Methods |
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# ---------------------------------------------------------------------- |
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40
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sub connect { |
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my $self = shift; |
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43
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my ($errno, $name, $errstr); |
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45
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$self->class->var('ERRNO', 0); |
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$self->class->var('ERRSTR', ''); |
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48
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if ($self->ssh->connect($self->host, $self->port)) { |
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50
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if ($self->pub_key) { |
51
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52
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unless ($self->ssh->auth_publickey($self->username, |
53
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$self->pub_key, $self->priv_key)) { |
54
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55
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($errno, $name, $errstr) = $self->ssh->error(); |
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57
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$self->class->var('ERRNO', $errno); |
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$self->class->var('ERRSTR', $errstr); |
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60
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$self->throw_msg( |
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dotid($self->class) . '.autherr', |
62
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'ssh_client_autherr', |
63
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$name, $errstr |
64
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); |
65
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66
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} |
67
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68
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} else { |
69
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70
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unless ($self->ssh->auth_password($self->username, $self->password)) { |
71
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72
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($errno, $name, $errstr) = $self->ssh->error(); |
73
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74
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$self->class->var('ERRNO', $errno); |
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$self->class->var('ERRSTR', $errstr); |
76
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77
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$self->throw_msg( |
78
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dotid($self->class) . '.autherr', |
79
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'ssh_client_autherr', |
80
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$name, $errstr |
81
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); |
82
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83
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} |
84
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85
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} |
86
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87
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$self->{'sock'} = $self->ssh->sock(); |
88
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$self->{'chan'} = $self->ssh->channel(); |
89
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$self->{'select'} = IO::Select->new($self->sock); |
90
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91
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$self->setup(); |
92
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93
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} else { |
94
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95
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($errno, $name, $errstr) = $self->ssh->error(); |
96
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97
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$self->class->var('ERRNO', $errno); |
98
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$self->class->var('ERRSTR', $errstr); |
99
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100
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$self->throw_msg( |
101
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dotid($self->class) . '.conerr', |
102
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'ssh_client_conerr', |
103
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$name, $errstr |
104
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); |
105
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106
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} |
107
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108
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} |
109
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110
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sub setup { |
111
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my $self = shift; |
112
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113
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} |
114
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115
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sub pending { |
116
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my $self = shift; |
117
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118
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return length($self->{'buffer'}); |
119
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120
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} |
121
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122
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sub disconnect { |
123
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my $self = shift; |
124
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125
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if (my $chan = $self->chan) { |
126
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127
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$chan->send_eof(); |
128
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$chan->close(); |
129
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130
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} |
131
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132
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if (my $ssh = $self->ssh) { |
133
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134
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$ssh->disconnect(); |
135
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136
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} |
137
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138
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} |
139
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140
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sub get { |
141
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my $self = shift; |
142
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my ($length) = validate_params(\@_, [ |
143
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{ optional => 1, default => 512 } |
144
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]); |
145
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146
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my $output = ''; |
147
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148
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# extract $length from buffer. if the buffer size is > $length then |
149
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# try to refill buffer. If there is nothing to read, then return |
150
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# the remainder of the buffer. |
151
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# |
152
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# Patterned after some libssh2 examples and C network programming |
153
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# "best practices". |
154
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155
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if ($self->pending > $length) { |
156
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157
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$output = $self->buf_slurp(\$self->{'buffer'}, $length); |
158
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159
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} else { |
160
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161
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$self->_fill_buffer(); |
162
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163
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my $l = ($self->pending > $length) ? $length : $self->pending; |
164
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$output = $self->buf_slurp(\$self->{'buffer'}, $l); |
165
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166
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} |
167
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168
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return $output; |
169
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170
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} |
171
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172
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sub gets { |
173
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my $self = shift; |
174
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175
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my $buffer; |
176
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my $output = ''; |
177
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178
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while (my $buf = $self->get()) { |
179
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180
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$buffer .= $buf; |
181
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182
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if ($output = $self->buf_get_line(\$buffer, $self->eol)) { |
183
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184
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$self->{'buffer'} = $buffer . $self->{'buffer'}; |
185
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last; |
186
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187
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} |
188
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189
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} |
190
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191
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return trim($output); |
192
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193
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} |
194
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195
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sub put { |
196
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my $self = shift; |
197
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my ($buffer) = validate_params(\@_, [1]); |
198
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199
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my $counter = 0; |
200
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my $working = 1; |
201
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my $written = 0; |
202
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my $bufsize = length($buffer); |
203
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204
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$self->class->var('ERRNO', 0); |
205
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$self->class->var('ERRSTR', ''); |
206
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207
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# Setup non-blocking writes. Keep writting until nothing is left. |
208
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# Returns the number of bytes written, if any. |
209
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# |
210
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# Patterned after some libssh2 examples and C network programming |
211
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# "best practices". |
212
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213
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$self->chan->blocking(0); |
214
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215
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do { |
216
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217
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if (my $bytes = $self->chan->write($buffer)) { |
218
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219
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$written += $bytes; |
220
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$buffer = substr($buffer, $bytes); |
221
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$working = 0 if ($written >= $bufsize); |
222
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223
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} else { |
224
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225
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my ($errno, $name, $errstr) = $self->ssh->error(); |
226
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if ($errno == LIBSSH2_ERROR_EAGAIN) { |
227
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228
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$counter++; |
229
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230
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$working = 0 if ($counter > $self->attempts); |
231
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$self->_waitsocket() if ($counter <= $self->attempts); |
232
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233
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} else { |
234
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235
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$self->chan->blocking(1); |
236
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237
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|
$self->class->var('ERRNO', $errno); |
238
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|
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|
$self->class->var('ERRSTR', $errstr); |
239
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|
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|
240
|
|
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|
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|
$self->throw_msg( |
241
|
|
|
|
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|
|
dotid($self->class) . '.protoerr', |
242
|
|
|
|
|
|
|
'ssh_client_protoerr', |
243
|
|
|
|
|
|
|
$name, $errstr |
244
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); |
245
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246
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} |
247
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248
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} |
249
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250
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} while ($working); |
251
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252
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$self->chan->blocking(1); |
253
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254
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return $written; |
255
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256
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} |
257
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258
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sub puts { |
259
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my $self = shift; |
260
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|
my ($buffer) = validate_params(\@_, [1]); |
261
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262
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|
my $output = sprintf("%s%s", trim($buffer), $self->eol); |
263
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|
my $written = $self->put($output); |
264
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265
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return $written; |
266
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267
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} |
268
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269
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sub errno { |
270
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|
my $class = shift; |
271
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|
my ($value) = validate_params(\@_, [ |
272
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{ optional => 1, default => undef } |
273
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]); |
274
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275
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|
class->var('ERRNO', $value) if (defined($value)); |
276
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277
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return class->var('ERRNO'); |
278
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279
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|
} |
280
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281
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|
sub errstr { |
282
|
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|
my $class = shift; |
283
|
|
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|
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|
my ($value) = validate_params(\@_, [ |
284
|
|
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|
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|
{ optional => 1, default => undef } |
285
|
|
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|
]); |
286
|
|
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287
|
|
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|
|
class->var('ERRSTR', $value) if (defined($value)); |
288
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|
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289
|
|
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|
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|
|
return class->var('ERRSTR'); |
290
|
|
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291
|
|
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|
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|
|
} |
292
|
|
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|
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|
|
293
|
|
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|
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|
|
sub DESTROY { |
294
|
|
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|
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|
|
my $self = shift; |
295
|
|
|
|
|
|
|
|
296
|
|
|
|
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|
|
$self->disconnect(); |
297
|
|
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|
|
|
|
|
298
|
|
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|
|
|
|
} |
299
|
|
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|
|
300
|
|
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|
|
|
|
# ---------------------------------------------------------------------- |
301
|
|
|
|
|
|
|
# Private Methods |
302
|
|
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|
|
|
|
# ---------------------------------------------------------------------- |
303
|
|
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|
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|
|
|
304
|
|
|
|
|
|
|
sub init { |
305
|
|
|
|
|
|
|
my $class = shift; |
306
|
|
|
|
|
|
|
|
307
|
|
|
|
|
|
|
my $self = $class->SUPER::init(@_); |
308
|
|
|
|
|
|
|
|
309
|
|
|
|
|
|
|
$self->{'ssh'} = Net::SSH2->new(); |
310
|
|
|
|
|
|
|
$self->{'buffer'} = ''; |
311
|
|
|
|
|
|
|
|
312
|
|
|
|
|
|
|
$self->attempts(5); # number of EAGAIN attempts |
313
|
|
|
|
|
|
|
|
314
|
|
|
|
|
|
|
return $self; |
315
|
|
|
|
|
|
|
|
316
|
|
|
|
|
|
|
} |
317
|
|
|
|
|
|
|
|
318
|
|
|
|
|
|
|
sub _fill_buffer { |
319
|
|
|
|
|
|
|
my $self = shift; |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
my $read = 0; |
322
|
|
|
|
|
|
|
my $counter = 0; |
323
|
|
|
|
|
|
|
my $working = 1; |
324
|
|
|
|
|
|
|
|
325
|
|
|
|
|
|
|
# Setup non-blocking read. Keep reading until nothing is left. |
326
|
|
|
|
|
|
|
# i.e. the reads timeout. |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
$self->chan->blocking(0); |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
while ($working) { |
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
my $buf; |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
if (my $bytes = $self->chan->read($buf, 512)) { |
335
|
|
|
|
|
|
|
|
336
|
|
|
|
|
|
|
$self->{'buffer'} .= $buf; |
337
|
|
|
|
|
|
|
$read += $bytes; |
338
|
|
|
|
|
|
|
|
339
|
|
|
|
|
|
|
} else { |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
my $syserr = $! + 0; |
342
|
|
|
|
|
|
|
my ($errno, $name, $errstr) = $self->ssh->error(); |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
if (($errno == LIBSSH2_ERROR_EAGAIN) || ($syserr == EAGAIN)) { |
345
|
|
|
|
|
|
|
|
346
|
|
|
|
|
|
|
$counter++; |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
$working = 0 if ($counter > $self->attempts); |
349
|
|
|
|
|
|
|
$self->_waitsocket() if ($counter <= $self->attempts); |
350
|
|
|
|
|
|
|
|
351
|
|
|
|
|
|
|
} else { |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
$self->chan->blocking(1); |
354
|
|
|
|
|
|
|
|
355
|
|
|
|
|
|
|
$self->class->var('ERRNO', $errno); |
356
|
|
|
|
|
|
|
$self->class->var('ERRSTR', $errstr); |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
$self->throw_msg( |
359
|
|
|
|
|
|
|
dotid($self->class) . '.protoerr', |
360
|
|
|
|
|
|
|
'ssh_client_protoerr', |
361
|
|
|
|
|
|
|
$name, $errstr |
362
|
|
|
|
|
|
|
); |
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
} |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
} |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
} |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
$self->chan->blocking(1); |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
return $read; |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
} |
375
|
|
|
|
|
|
|
|
376
|
|
|
|
|
|
|
sub _waitsocket { |
377
|
|
|
|
|
|
|
my $self = shift; |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
my $to = $self->timeout; |
380
|
|
|
|
|
|
|
my $dir = $self->ssh->block_directions(); |
381
|
|
|
|
|
|
|
|
382
|
|
|
|
|
|
|
# If $dir is 1, then input is blocking. |
383
|
|
|
|
|
|
|
# If $dir is 2, then output is blocking. |
384
|
|
|
|
|
|
|
# |
385
|
|
|
|
|
|
|
# Patterned after some libssh2 examples. |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
if ($dir == 1) { |
388
|
|
|
|
|
|
|
|
389
|
|
|
|
|
|
|
$self->select->can_read($to); |
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
} else { |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
$self->select->can_write($to); |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
} |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
return $! + 0; |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
} |
400
|
|
|
|
|
|
|
|
401
|
|
|
|
|
|
|
1; |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
__END__ |
404
|
|
|
|
|
|
|
|
405
|
|
|
|
|
|
|
=head1 NAME |
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
XAS::Lib::SSH::Client - A SSH based client |
408
|
|
|
|
|
|
|
|
409
|
|
|
|
|
|
|
=head1 SYNOPSIS |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
use XAS::Lib::SSH::Client; |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
my $client = XAS::Lib::SSH::Client->new( |
414
|
|
|
|
|
|
|
-host => 'auburn-xen-01', |
415
|
|
|
|
|
|
|
-username => 'root', |
416
|
|
|
|
|
|
|
-password => 'secret', |
417
|
|
|
|
|
|
|
); |
418
|
|
|
|
|
|
|
|
419
|
|
|
|
|
|
|
$client->connect(); |
420
|
|
|
|
|
|
|
|
421
|
|
|
|
|
|
|
$client->put($data); |
422
|
|
|
|
|
|
|
$data = $client->get(); |
423
|
|
|
|
|
|
|
|
424
|
|
|
|
|
|
|
$client->disconnect(); |
425
|
|
|
|
|
|
|
|
426
|
|
|
|
|
|
|
=head1 DESCRIPTION |
427
|
|
|
|
|
|
|
|
428
|
|
|
|
|
|
|
The module provides basic network connectivity along with input/output methods |
429
|
|
|
|
|
|
|
using the SSH protocol. It can authenticate using username/password or |
430
|
|
|
|
|
|
|
username/public key/private key/password. |
431
|
|
|
|
|
|
|
|
432
|
|
|
|
|
|
|
=head1 METHODS |
433
|
|
|
|
|
|
|
|
434
|
|
|
|
|
|
|
=head2 new |
435
|
|
|
|
|
|
|
|
436
|
|
|
|
|
|
|
This initializes the object. It takes the following parameters: |
437
|
|
|
|
|
|
|
|
438
|
|
|
|
|
|
|
=over 4 |
439
|
|
|
|
|
|
|
|
440
|
|
|
|
|
|
|
=item B<-username> |
441
|
|
|
|
|
|
|
|
442
|
|
|
|
|
|
|
An optional username to use when connecting to the server. |
443
|
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
=item B<-password> |
445
|
|
|
|
|
|
|
|
446
|
|
|
|
|
|
|
An optional password to use for authentication. |
447
|
|
|
|
|
|
|
|
448
|
|
|
|
|
|
|
=item B<-pub_key> |
449
|
|
|
|
|
|
|
|
450
|
|
|
|
|
|
|
An optional public ssh key file to use. |
451
|
|
|
|
|
|
|
|
452
|
|
|
|
|
|
|
=item B<-priv_key> |
453
|
|
|
|
|
|
|
|
454
|
|
|
|
|
|
|
An optional private ssh key to use. |
455
|
|
|
|
|
|
|
|
456
|
|
|
|
|
|
|
=item B<-host> |
457
|
|
|
|
|
|
|
|
458
|
|
|
|
|
|
|
The server to connect too. Defaults to 'localhost'. |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
=item B<-port> |
461
|
|
|
|
|
|
|
|
462
|
|
|
|
|
|
|
The port to use on the server. It defaults to 22. |
463
|
|
|
|
|
|
|
|
464
|
|
|
|
|
|
|
=item B<-timeout> |
465
|
|
|
|
|
|
|
|
466
|
|
|
|
|
|
|
The number of seconds to timeout writes. It must be compatible with IO::Select. |
467
|
|
|
|
|
|
|
Defaults to 0.2. |
468
|
|
|
|
|
|
|
|
469
|
|
|
|
|
|
|
=item B<-eol> |
470
|
|
|
|
|
|
|
|
471
|
|
|
|
|
|
|
The EOL to use, defaults to "\015\012". |
472
|
|
|
|
|
|
|
|
473
|
|
|
|
|
|
|
=back |
474
|
|
|
|
|
|
|
|
475
|
|
|
|
|
|
|
=head2 connect |
476
|
|
|
|
|
|
|
|
477
|
|
|
|
|
|
|
This method makes a connection to the server. |
478
|
|
|
|
|
|
|
|
479
|
|
|
|
|
|
|
=head2 setup |
480
|
|
|
|
|
|
|
|
481
|
|
|
|
|
|
|
This method sets up the channel to be used. It needs to be overridden |
482
|
|
|
|
|
|
|
to be useful. |
483
|
|
|
|
|
|
|
|
484
|
|
|
|
|
|
|
=head2 get($length) |
485
|
|
|
|
|
|
|
|
486
|
|
|
|
|
|
|
This block reads data from the channel. A buffer is returned when it reaches |
487
|
|
|
|
|
|
|
$length or timeout, whichever is first. |
488
|
|
|
|
|
|
|
|
489
|
|
|
|
|
|
|
=over 4 |
490
|
|
|
|
|
|
|
|
491
|
|
|
|
|
|
|
=item B<$length> |
492
|
|
|
|
|
|
|
|
493
|
|
|
|
|
|
|
An optional length for the buffer. Defaults to 512 bytes. |
494
|
|
|
|
|
|
|
|
495
|
|
|
|
|
|
|
=back |
496
|
|
|
|
|
|
|
|
497
|
|
|
|
|
|
|
=head2 gets |
498
|
|
|
|
|
|
|
|
499
|
|
|
|
|
|
|
This reads a buffer delimited by the eol from the channel. |
500
|
|
|
|
|
|
|
|
501
|
|
|
|
|
|
|
=head2 errno |
502
|
|
|
|
|
|
|
|
503
|
|
|
|
|
|
|
A class method to return the SSH error number. |
504
|
|
|
|
|
|
|
|
505
|
|
|
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|
|
|
=head2 errstr |
506
|
|
|
|
|
|
|
|
507
|
|
|
|
|
|
|
A class method to return the SSH error string. |
508
|
|
|
|
|
|
|
|
509
|
|
|
|
|
|
|
=head2 put($buffer) |
510
|
|
|
|
|
|
|
|
511
|
|
|
|
|
|
|
This method will write a buffer to the channel. Returns the number of |
512
|
|
|
|
|
|
|
bytes written. |
513
|
|
|
|
|
|
|
|
514
|
|
|
|
|
|
|
=over 4 |
515
|
|
|
|
|
|
|
|
516
|
|
|
|
|
|
|
=item B<$buffer> |
517
|
|
|
|
|
|
|
|
518
|
|
|
|
|
|
|
The buffer to be written. |
519
|
|
|
|
|
|
|
|
520
|
|
|
|
|
|
|
=back |
521
|
|
|
|
|
|
|
|
522
|
|
|
|
|
|
|
=head2 puts($buffer) |
523
|
|
|
|
|
|
|
|
524
|
|
|
|
|
|
|
This writes a buffer that is terminated with eol to the channel. Returns the |
525
|
|
|
|
|
|
|
number of bytes written. |
526
|
|
|
|
|
|
|
|
527
|
|
|
|
|
|
|
=over 4 |
528
|
|
|
|
|
|
|
|
529
|
|
|
|
|
|
|
=item B<$buffer> |
530
|
|
|
|
|
|
|
|
531
|
|
|
|
|
|
|
The buffer to send over the socket. |
532
|
|
|
|
|
|
|
|
533
|
|
|
|
|
|
|
=back |
534
|
|
|
|
|
|
|
|
535
|
|
|
|
|
|
|
=head2 disconnect |
536
|
|
|
|
|
|
|
|
537
|
|
|
|
|
|
|
This method closes the connection. |
538
|
|
|
|
|
|
|
|
539
|
|
|
|
|
|
|
=head1 MUTATORS |
540
|
|
|
|
|
|
|
|
541
|
|
|
|
|
|
|
=head2 attempts |
542
|
|
|
|
|
|
|
|
543
|
|
|
|
|
|
|
This is used when reading data from the channel. It triggers how many |
544
|
|
|
|
|
|
|
times to attempt reading from the channel when a LIBSSH2_ERROR_EAGAIN |
545
|
|
|
|
|
|
|
error occurs. The default is 5 times. |
546
|
|
|
|
|
|
|
|
547
|
|
|
|
|
|
|
=head1 SEE ALSO |
548
|
|
|
|
|
|
|
|
549
|
|
|
|
|
|
|
=over 4 |
550
|
|
|
|
|
|
|
|
551
|
|
|
|
|
|
|
=item L<XAS::Lib::SSH::Server|XAS::Lib::SSH::Server> |
552
|
|
|
|
|
|
|
|
553
|
|
|
|
|
|
|
=item L<XAS::Lib::SSH::Client::Exec|XAS::Lib::SSH::Client::Exec> |
554
|
|
|
|
|
|
|
|
555
|
|
|
|
|
|
|
=item L<XAS::Lib::SSH::Client::Shell|XAS::Lib::SSH::Client::Shell> |
556
|
|
|
|
|
|
|
|
557
|
|
|
|
|
|
|
=item L<XAS::Lib::SSH::Client::Subsystem|XAS::Lib::SSH::Client::Subsystem> |
558
|
|
|
|
|
|
|
|
559
|
|
|
|
|
|
|
=item L<Net::SSH2|https://metacpan.org/pod/Net::SSH2> |
560
|
|
|
|
|
|
|
|
561
|
|
|
|
|
|
|
=item L<XAS|XAS> |
562
|
|
|
|
|
|
|
|
563
|
|
|
|
|
|
|
=back |
564
|
|
|
|
|
|
|
|
565
|
|
|
|
|
|
|
=head1 AUTHOR |
566
|
|
|
|
|
|
|
|
567
|
|
|
|
|
|
|
Kevin L. Esteb, E<lt>kevin@kesteb.usE<gt> |
568
|
|
|
|
|
|
|
|
569
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
570
|
|
|
|
|
|
|
|
571
|
|
|
|
|
|
|
Copyright (c) 2012-2015 Kevin L. Esteb |
572
|
|
|
|
|
|
|
|
573
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
574
|
|
|
|
|
|
|
the terms of the Artistic License 2.0. For details, see the full text |
575
|
|
|
|
|
|
|
of the license at http://www.perlfoundation.org/artistic_license_2_0. |
576
|
|
|
|
|
|
|
|
577
|
|
|
|
|
|
|
=cut |