[7a1c90d] | 1 | =pod |
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| 2 | |
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| 3 | Net::OSCAR::Connection::Direct -- OSCAR direct connections |
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| 4 | |
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| 5 | =cut |
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| 6 | |
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| 7 | package Net::OSCAR::Connection::Direct; |
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| 8 | |
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| 9 | $VERSION = '1.925'; |
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| 10 | $REVISION = '$Revision: 1.13 $'; |
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| 11 | |
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| 12 | use strict; |
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| 13 | use Carp; |
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| 14 | |
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| 15 | use vars qw(@ISA $VERSION $REVISION); |
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| 16 | use Socket; |
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| 17 | use Symbol; |
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| 18 | use Net::OSCAR::Common qw(:all); |
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| 19 | use Net::OSCAR::Constants; |
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| 20 | use Net::OSCAR::Utility; |
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| 21 | use Net::OSCAR::XML; |
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| 22 | @ISA = qw(Net::OSCAR::Connection); |
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| 23 | |
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| 24 | sub process_one($;$$$) { |
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| 25 | my($self, $read, $write, $error) = @_; |
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| 26 | my $snac; |
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| 27 | |
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| 28 | if($error) { |
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| 29 | $self->{sockerr} = 1; |
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| 30 | $self->disconnect(); |
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| 31 | |
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| 32 | if($self->{rv}->{ft_state} eq "connecting" or $self->{rv}->{ft_state} eq "connected") { |
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| 33 | $self->log_print(OSCAR_DBG_INFO, "Couldn't connect to rendezvous peer; revising rendezvous."); |
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| 34 | $self->{session}->rendezvous_revise($self->{rv}->{cookie}); |
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| 35 | } |
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| 36 | |
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| 37 | return; |
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| 38 | } |
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| 39 | |
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| 40 | #$self->log_printf(OSCAR_DBG_DEBUG, |
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| 41 | # "Called process_one on direct connection: st=%s, fts=%s, dir=%s, acp=%s, r=$read, w=$write, e=$error", |
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| 42 | # $self->{state}, $self->{rv}->{ft_state}, $self->{rv}->{direction}, $self->{rv}->{accepted} |
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| 43 | #); |
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| 44 | if($read and $self->{rv}->{ft_state} eq "listening") { |
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| 45 | my $newsock = gensym(); |
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| 46 | |
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| 47 | if(accept($newsock, $self->{socket})) { |
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| 48 | $self->log_print(OSCAR_DBG_DEBUG, "Accepted incoming connection."); |
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| 49 | $self->{session}->callback_connection_changed($self, "deleted"); |
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| 50 | close($self->{socket}); |
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| 51 | $self->{socket} = $newsock; |
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| 52 | $self->set_blocking(0); |
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| 53 | |
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| 54 | if($self->{rv}->{direction} eq "send") { |
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| 55 | $self->{state} = "write"; |
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| 56 | } else { |
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| 57 | $self->{state} = "read"; |
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| 58 | } |
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| 59 | |
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| 60 | $self->{rv}->{ft_state} = "connected"; |
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| 61 | $self->{session}->callback_connection_changed($self, $self->{state}); |
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| 62 | |
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| 63 | return 1; |
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| 64 | } else { |
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| 65 | $self->log_print(OSCAR_DBG_WARN, "Failed to accept incoming connection: $!"); |
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| 66 | return 0; |
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| 67 | } |
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| 68 | } elsif($write and $self->{rv}->{ft_state} eq "proxy_connect") { |
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| 69 | $self->log_print(OSCAR_DBG_DEBUG, "Connected to proxy."); |
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| 70 | $self->{connected} = 1; |
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| 71 | my $ret; |
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| 72 | |
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| 73 | if($self->{sent_proxy_init}++) { |
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| 74 | my $packet = protoparse($self->{session}, "direct_connect_proxy_init")->pack( |
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| 75 | msg_type => 2, |
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| 76 | screenname => $self->{rv}->{peer}, |
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| 77 | cookie => $self->{rv}->{cookie}, |
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| 78 | capability => OSCAR_CAPS()->{filexfer}->{value} |
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| 79 | ); |
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| 80 | $ret = $self->write(pack("n", length($packet)) . $packet); |
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| 81 | } else { |
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| 82 | $ret = $self->write(); |
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| 83 | } |
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| 84 | |
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| 85 | return $ret unless $ret; |
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| 86 | |
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| 87 | delete $self->{sent_proxy_init}; |
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| 88 | $self->{rv}->{ft_state} = "proxy_ack"; |
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| 89 | $self->{state} = "read"; |
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| 90 | $self->{session}->callback_connection_changed($self, "read"); |
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| 91 | } elsif($read and $self->{rv}->{ft_state} eq "proxy_ack") { |
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| 92 | my $ret = $self->get_proxy_header("direct_connect_proxy_reply"); |
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| 93 | return $ret unless $ret; |
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| 94 | |
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| 95 | if($ret->{magic} != 1098 or $ret->{msg_type} != 3) { |
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| 96 | $self->{sockerr} = 1; |
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| 97 | $self->disconnect(); |
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| 98 | |
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| 99 | $self->log_print(OSCAR_DBG_INFO, "Bad response from proxy; revising rendezvous."); |
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| 100 | $self->{session}->rendezvous_revise($self->{rv}->{cookie}); |
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| 101 | |
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| 102 | return undef; |
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| 103 | } else { |
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| 104 | $self->{rv}->{ft_state} = "proxy_connected"; |
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| 105 | $self->{state} = "read"; |
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| 106 | $self->{session}->callback_connection_changed($self, "read"); |
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| 107 | |
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| 108 | my %protodata = ( |
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| 109 | status => "accept", |
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| 110 | cookie => $self->{rv}->{cookie}, |
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| 111 | capability => OSCAR_CAPS()->{$self->{rv}->{type}} ? OSCAR_CAPS()->{$self->{rv}->{type}}->{value} : $self->{rv}->{type}, |
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| 112 | client_1_ip => $ret->{ip}, |
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| 113 | port => $ret->{port} |
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| 114 | ); |
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| 115 | $self->{session}->send_message($self->{rv}->{sender}, 2, protoparse($self->{session}, "rendezvous_IM")->pack(%protodata)); |
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| 116 | } |
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| 117 | } elsif($read and $self->{rv}->{ft_state} eq "proxy_connect") { |
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| 118 | my $ret = $self->get_proxy_header(); |
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| 119 | return $ret unless $ret; |
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| 120 | |
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| 121 | if($ret->{magic} != 1098 or $ret->{msg_type} != 5) { |
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| 122 | $self->{sockerr} = 1; |
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| 123 | $self->disconnect(); |
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| 124 | |
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| 125 | $self->log_print(OSCAR_DBG_INFO, "Bad response from proxy; revising rendezvous."); |
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| 126 | $self->{session}->rendezvous_revise($self->{rv}->{cookie}); |
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| 127 | |
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| 128 | return undef; |
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| 129 | } else { |
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| 130 | $self->log_print(OSCAR_DBG_DEBUG, "Rendezvous peer connected to proxy."); |
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| 131 | $self->{rv}->{ft_state} = "connected"; |
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| 132 | if($self->{rv}->{direction} eq "send") { |
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| 133 | $self->{state} = "write"; |
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| 134 | } else { |
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| 135 | $self->{state} = "read"; |
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| 136 | } |
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| 137 | |
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| 138 | $self->{session}->callback_connection_changed($self, $self->{state}); |
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| 139 | } |
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| 140 | } elsif($write and $self->{rv}->{ft_state} eq "connecting") { |
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| 141 | $self->log_print(OSCAR_DBG_DEBUG, "Connected."); |
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| 142 | $self->{connected} = 1; |
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| 143 | |
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| 144 | my %protodata; |
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| 145 | $protodata{status} = "accept"; |
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| 146 | $protodata{cookie} = $self->{rv}->{cookie}; |
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| 147 | $protodata{capability} = OSCAR_CAPS()->{$self->{rv}->{type}} ? OSCAR_CAPS()->{$self->{rv}->{type}}->{value} : $self->{rv}->{type}; |
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| 148 | $self->{session}->send_message($self->{rv}->{sender}, 2, protoparse($self->{session}, "rendezvous_IM")->pack(%protodata)); |
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| 149 | |
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| 150 | $self->{rv}->{ft_state} = "connected"; |
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| 151 | $self->{rv}->{accepted} = 1; |
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| 152 | if($self->{rv}->{direction} eq "receive") { |
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| 153 | $self->{state} = "read"; |
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| 154 | $self->{session}->callback_connection_changed($self, $self->{state}); |
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| 155 | } |
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| 156 | } elsif($write and $self->{rv}->{ft_state} eq "connected") { |
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| 157 | if($self->{rv}->{direction} eq "send") { |
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| 158 | return 1 unless $self->{rv}->{accepted}; |
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| 159 | } |
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| 160 | |
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| 161 | $self->log_print(OSCAR_DBG_DEBUG, "Sending OFT header (SYN)."); |
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| 162 | my $ret; |
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| 163 | if($self->{sent_oft_header}) { |
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| 164 | $self->log_print(OSCAR_DBG_DEBUG, "Flushing buffer"); |
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| 165 | $ret = $self->write(); # Flush buffer |
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| 166 | } else { |
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| 167 | $self->log_print(OSCAR_DBG_DEBUG, "Sending initial header"); |
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| 168 | $self->{sent_oft_header} = 1; |
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| 169 | if($self->{rv}->{direction} eq "send" and !$self->{got_files}) { |
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| 170 | $self->{checksum} = $self->checksum($self->{rv}->{data}->[0]); |
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| 171 | $self->{byte_count} = $self->{rv}->{total_size}; |
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| 172 | $self->{bytes_left} = length($self->{rv}->{data}->[0]); |
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| 173 | $self->{filename} = $self->{rv}->{filenames}->[0]; |
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| 174 | } |
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| 175 | $ret = $self->send_oft_header(); |
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| 176 | } |
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| 177 | return $ret unless $ret; |
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| 178 | |
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| 179 | if($self->{rv}->{direction} eq "receive") { |
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| 180 | if($self->{rv}->{file_count} == 1 or ($self->{sent_oft_header} and $self->{sent_oft_header} >= 2)) { |
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| 181 | $self->{rv}->{ft_state} = "data"; |
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| 182 | } else { |
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| 183 | $self->log_print(OSCAR_DBG_DEBUG, "Sending second header."); |
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| 184 | $self->{sent_oft_header} = 2; |
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| 185 | $ret = $self->send_oft_header(); |
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| 186 | return $ret unless $ret; |
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| 187 | $self->{rv}->{ft_state} = "data"; |
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| 188 | } |
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| 189 | } |
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| 190 | |
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| 191 | delete $self->{sent_oft_header}; |
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| 192 | $self->{state} = "read"; |
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| 193 | $self->{session}->callback_connection_changed($self, "read"); |
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| 194 | } elsif($read and $self->{rv}->{ft_state} eq "connected") { |
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| 195 | $self->log_print(OSCAR_DBG_DEBUG, "Getting OFT header"); |
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| 196 | my $ret = $self->get_oft_header(); |
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| 197 | return $ret unless $ret; |
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| 198 | |
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| 199 | if($self->{rv}->{direction} eq "send") { |
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| 200 | $self->{rv}->{ft_state} = "data"; |
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| 201 | } elsif($self->{got_files}) { |
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| 202 | $self->{sent_oft_header} = 2; |
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| 203 | $self->log_print(OSCAR_DBG_DEBUG, "Sending second header."); |
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| 204 | $ret = $self->send_oft_header(); |
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| 205 | if($ret) { |
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| 206 | delete $self->{sent_oft_header}; |
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| 207 | $self->{rv}->{ft_date} = "data"; |
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| 208 | $self->{state} = "read"; |
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| 209 | $self->{session}->callback_connection_changed($self, "read"); |
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| 210 | return; |
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| 211 | } |
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| 212 | } |
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| 213 | |
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| 214 | $self->{state} = "write"; |
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| 215 | $self->{session}->callback_connection_changed($self, "write"); |
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| 216 | } elsif($self->{rv}->{ft_state} eq "data") { |
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| 217 | my $ret; |
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| 218 | |
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| 219 | if($write and $self->{rv}->{direction} eq "send") { |
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| 220 | $self->log_print(OSCAR_DBG_DEBUG, "Sending data"); |
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| 221 | if($self->{sent_data}++) { |
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| 222 | $ret = $self->write(); |
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| 223 | } else { |
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| 224 | $ret = $self->write($self->{rv}->{data}->[0]); |
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| 225 | } |
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| 226 | |
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| 227 | if($ret) { |
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| 228 | $self->log_print(OSCAR_DBG_DEBUG, "Done sending data"); |
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| 229 | |
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| 230 | shift @{$self->{rv}->{data}}; |
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| 231 | shift @{$self->{rv}->{filenames}}; |
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| 232 | $self->{sent_data} = 0; |
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| 233 | |
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| 234 | $self->{rv}->{ft_state} = "fin"; |
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| 235 | $self->{state} = "read"; |
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| 236 | $self->{session}->callback_connection_changed($self, "read"); |
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| 237 | } else { |
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| 238 | return $ret; |
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| 239 | } |
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| 240 | } elsif($read and $self->{rv}->{direction} eq "receive") { |
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| 241 | $self->log_printf(OSCAR_DBG_DEBUG, "Receiving %d bytes of data", $self->{read_size}); |
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| 242 | if($self->{got_data}++) { |
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| 243 | $self->log_print(OSCAR_DBG_DEBUG, "Getting more data"); |
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| 244 | $ret = $self->read(); |
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| 245 | } else { |
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| 246 | $self->log_print(OSCAR_DBG_DEBUG, "Doing initial read"); |
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| 247 | $ret = $self->read($self->{read_size}); |
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| 248 | } |
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| 249 | |
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| 250 | if($ret) { |
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| 251 | $self->log_printf(OSCAR_DBG_DEBUG, "Got complete file, %d bytes.", length($ret)); |
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| 252 | |
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| 253 | $self->{rv}->{data} ||= []; |
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| 254 | push @{$self->{rv}->{data}}, $ret; |
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| 255 | shift @{$self->{rv}->{filenames}}; |
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| 256 | $self->{bytes_recv} = length($ret); |
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| 257 | $self->{got_data} = 0; |
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| 258 | $self->{received_checksum} = $self->checksum($ret); |
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| 259 | |
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| 260 | if($self->{received_checksum} != $self->{checksum}) { |
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| 261 | $self->log_printf(OSCAR_DBG_WARN, "Checksum mismatch: %lu/%lu", $self->{checksum}, $self->{received_checksum}); |
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| 262 | $self->log_print(OSCAR_DBG_WARN, "Data: ", hexdump($ret)); |
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| 263 | $self->{sockerr} = 1; |
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| 264 | $self->disconnect(); |
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| 265 | return undef; |
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| 266 | } else { |
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| 267 | $self->log_print(OSCAR_DBG_WARN, "Data: ", hexdump($ret)); |
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| 268 | } |
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| 269 | |
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| 270 | $self->{rv}->{ft_state} = "fin"; |
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| 271 | $self->{state} = "write"; |
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| 272 | $self->{session}->callback_connection_changed($self, "write"); |
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| 273 | } else { |
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| 274 | return $ret; |
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| 275 | } |
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| 276 | } |
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| 277 | } elsif($self->{rv}->{ft_state} eq "fin") { |
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| 278 | if($read and $self->{rv}->{direction} eq "send") { |
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| 279 | $self->log_print(OSCAR_DBG_DEBUG, "Getting OFT fin header"); |
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| 280 | my $ret = $self->get_oft_header(); |
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| 281 | return $ret unless $ret; |
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| 282 | |
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| 283 | if(@{$self->{rv}->{data}}) { |
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| 284 | $self->{rv}->{ft_state} = "connected"; |
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| 285 | $self->{state} = "write"; |
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| 286 | $self->{session}->callback_connection_changed($self, "write"); |
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| 287 | } else { |
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| 288 | $self->disconnect(); |
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| 289 | } |
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| 290 | |
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| 291 | return 1; |
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| 292 | } elsif($write and $self->{rv}->{direction} eq "receive") { |
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| 293 | $self->log_print(OSCAR_DBG_DEBUG, "Sending OFT fin header"); |
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| 294 | my $ret = $self->send_oft_header(); |
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| 295 | return $ret unless $ret; |
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| 296 | |
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| 297 | if(++$self->{got_files} < $self->{rv}->{file_count}) { |
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| 298 | $self->{rv}->{ft_state} = "connected"; |
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| 299 | $self->{state} = "read"; |
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| 300 | $self->{session}->callback_connection_changed($self, "read"); |
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| 301 | } else { |
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| 302 | $self->disconnect(); |
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| 303 | } |
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| 304 | return 1; |
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| 305 | } |
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| 306 | } |
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| 307 | } |
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| 308 | |
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| 309 | sub send_oft_header($) { |
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| 310 | my $self = shift; |
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| 311 | |
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| 312 | my $total_size = 0; |
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| 313 | $total_size += length($_) foreach @{$self->{rv}->{data}}; |
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| 314 | |
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| 315 | my $type; |
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| 316 | my $cookie; |
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| 317 | if($self->{rv}->{ft_state} eq "connected" and ($self->{sent_oft_header} and $self->{sent_oft_header} != 2)) { |
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| 318 | if($self->{rv}->{direction} eq "send") { |
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| 319 | $type = 0x101; |
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| 320 | $cookie = chr(0) x 8; |
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| 321 | } else { |
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| 322 | $type = 0x202; |
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| 323 | $cookie = $self->{rv}->{cookie}; |
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| 324 | } |
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| 325 | } else { |
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| 326 | $type = 0x204; |
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| 327 | $cookie = $self->{rv}->{cookie}; |
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| 328 | } |
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| 329 | |
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| 330 | my %protodata = ( |
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| 331 | type => $type, |
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| 332 | cookie => $cookie, |
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| 333 | file_count => $self->{rv}->{file_count}, |
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| 334 | files_left => scalar(@{$self->{rv}->{data}}), |
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| 335 | byte_count => $self->{byte_count}, |
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| 336 | bytes_left => $self->{bytes_left}, |
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| 337 | mtime => time(), |
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| 338 | ctime => 0, |
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| 339 | bytes_received => $self->{bytes_recv}, |
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| 340 | checksum => $self->{checksum}, |
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| 341 | received_checksum => $self->{received_checksum}, |
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| 342 | filename => $self->{filename} |
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| 343 | ); |
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| 344 | $self->write(protoparse($self->{session}, "file_transfer_header")->pack(%protodata)); |
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| 345 | } |
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| 346 | |
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| 347 | sub get_oft_header($) { |
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| 348 | my $self = shift; |
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| 349 | |
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| 350 | my $header = $self->read(6); |
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| 351 | return $header unless $header; |
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| 352 | my($magic, $length) = unpack("a4 n", $header); |
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| 353 | |
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| 354 | if($magic ne "OFT2") { |
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| 355 | $self->log_print(OSCAR_DBG_WARN, "Got unexpected data while reading file transfer header!"); |
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| 356 | $self->{sockerr} = 1; |
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| 357 | $self->disconnect(); |
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| 358 | return undef; |
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| 359 | } |
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| 360 | |
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| 361 | my $data = $self->read($length - 6); |
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| 362 | return $data unless $data; |
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| 363 | |
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| 364 | my %protodata = protoparse($self->{session}, "file_transfer_header")->unpack($header . $data); |
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| 365 | if($self->{rv}->{direction} eq "receive") { |
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| 366 | if( |
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| 367 | $protodata{file_count} != $self->{rv}->{file_count} or |
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| 368 | $protodata{byte_count} != $self->{rv}->{total_size} |
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| 369 | ) { |
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| 370 | $self->log_print(OSCAR_DBG_WARN, "Rendezvous header data doesn't match initial proposal!"); |
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| 371 | $self->{sockerr} = 1; |
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| 372 | $self->disconnect(); |
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| 373 | return undef; |
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| 374 | } else { |
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| 375 | $self->{read_size} = $protodata{bytes_left}; |
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| 376 | $self->{checksum} = $protodata{checksum}; |
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| 377 | $self->{byte_count} = $protodata{byte_count}; |
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| 378 | $self->{bytes_left} = $protodata{bytes_left}; |
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| 379 | $self->{filename} = $protodata{filename}; |
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| 380 | } |
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| 381 | } else { |
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| 382 | if($protodata{cookie} ne $self->{rv}->{cookie}) { |
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| 383 | $self->log_print(OSCAR_DBG_WARN, "Rendezvous header cookie doesn't match initial proposal!"); |
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| 384 | $self->{sockerr} = 1; |
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| 385 | $self->disconnect(); |
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| 386 | return undef; |
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| 387 | } |
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| 388 | } |
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| 389 | |
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| 390 | $self->log_print(OSCAR_DBG_DEBUG, "Got OFT header."); |
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| 391 | return 1; |
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| 392 | } |
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| 393 | |
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| 394 | # Adopted from Gaim's implementation |
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| 395 | sub checksum($$) { |
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| 396 | my($self, $part) = @_; |
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| 397 | my $check = sprintf("%lu", (0xFFFF0000 >> 16) & 0xFFFF); |
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| 398 | |
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| 399 | for(my $i = 0; $i < length($part); $i++) { |
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| 400 | my $oldcheck = $check; |
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| 401 | |
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| 402 | my $byte = ord(substr($part, $i, 1)); |
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| 403 | my $val = ($i & 1) ? $byte : ($byte << 8); |
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| 404 | $check -= $val; |
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| 405 | $check = sprintf("%lu", $check); |
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| 406 | |
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| 407 | if($check > $oldcheck) { |
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| 408 | $check--; |
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| 409 | $check = sprintf("%lu", $check); |
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| 410 | } |
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| 411 | } |
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| 412 | |
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| 413 | $check = (($check & 0x0000FFFF) + ($check >> 16)); |
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| 414 | $check = (($check & 0x0000FFFF) + ($check >> 16)); |
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| 415 | $check = $check << 16; |
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| 416 | |
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| 417 | return sprintf("%lu", $check); |
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| 418 | } |
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| 419 | |
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| 420 | sub get_proxy_header($;$) { |
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| 421 | my ($self, $protobit) = @_; |
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| 422 | my $socket = $self->{socket}; |
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| 423 | my ($buffer, $len); |
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| 424 | my $nchars; |
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| 425 | $protobit ||= "direct_connect_proxy_hdr"; |
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| 426 | |
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| 427 | if(!$self->{buff_gotproxy}) { |
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| 428 | my $header = $self->read(2); |
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| 429 | if(!defined($header)) { |
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| 430 | return undef; |
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| 431 | } elsif($header eq "") { |
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| 432 | return ""; |
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| 433 | } |
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| 434 | |
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| 435 | $self->{buff_gotproxy} = 2; |
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| 436 | ($self->{proxy_size}) = unpack("n", $header); |
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| 437 | } |
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| 438 | |
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| 439 | if($self->{proxy_size} > 0) { |
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| 440 | my $data = $self->read($self->{proxy_size}, 2); |
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| 441 | if(!defined($data)) { |
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| 442 | return undef; |
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| 443 | } elsif($data eq "") { |
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| 444 | return ""; |
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| 445 | } |
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| 446 | |
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| 447 | $self->log_print_cond(OSCAR_DBG_PACKETS, sub { "Got ", hexdump($data) }); |
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| 448 | delete $self->{buff_gotproxy}; |
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| 449 | return {protoparse($self->{session}, $protobit)->unpack($data)}; |
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| 450 | } else { |
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| 451 | delete $self->{buff_gotproxy}; |
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| 452 | return ""; |
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| 453 | } |
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| 454 | } |
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| 455 | |
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| 456 | 1; |
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