1 | ##
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2 | ## Generic data connection package
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3 | ##
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4 |
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5 | package Net::FTP::dataconn;
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6 |
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7 | use Carp;
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8 | use vars qw(@ISA $timeout $VERSION);
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9 | use Net::Cmd;
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10 | use Errno;
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11 |
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12 | $VERSION = '0.11';
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13 | @ISA = qw(IO::Socket::INET);
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14 |
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15 | sub reading
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16 | {
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17 | my $data = shift;
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18 | ${*$data}{'net_ftp_bytesread'} = 0;
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19 | }
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20 |
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21 | sub abort
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22 | {
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23 | my $data = shift;
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24 | my $ftp = ${*$data}{'net_ftp_cmd'};
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25 |
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26 | # no need to abort if we have finished the xfer
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27 | return $data->close
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28 | if ${*$data}{'net_ftp_eof'};
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29 |
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30 | # for some reason if we continously open RETR connections and not
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31 | # read a single byte, then abort them after a while the server will
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32 | # close our connection, this prevents the unexpected EOF on the
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33 | # command channel -- GMB
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34 | if(exists ${*$data}{'net_ftp_bytesread'}
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35 | && (${*$data}{'net_ftp_bytesread'} == 0)) {
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36 | my $buf="";
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37 | my $timeout = $data->timeout;
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38 | $data->can_read($timeout) && sysread($data,$buf,1);
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39 | }
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40 |
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41 | ${*$data}{'net_ftp_eof'} = 1; # fake
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42 |
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43 | $ftp->abort; # this will close me
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44 | }
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45 |
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46 | sub _close
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47 | {
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48 | my $data = shift;
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49 | my $ftp = ${*$data}{'net_ftp_cmd'};
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50 |
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51 | $data->SUPER::close();
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52 |
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53 | delete ${*$ftp}{'net_ftp_dataconn'}
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54 | if exists ${*$ftp}{'net_ftp_dataconn'} &&
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55 | $data == ${*$ftp}{'net_ftp_dataconn'};
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56 | }
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57 |
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58 | sub close
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59 | {
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60 | my $data = shift;
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61 | my $ftp = ${*$data}{'net_ftp_cmd'};
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62 |
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63 | if(exists ${*$data}{'net_ftp_bytesread'} && !${*$data}{'net_ftp_eof'}) {
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64 | my $junk;
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65 | $data->read($junk,1,0);
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66 | return $data->abort unless ${*$data}{'net_ftp_eof'};
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67 | }
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68 |
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69 | $data->_close;
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70 |
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71 | $ftp->response() == CMD_OK &&
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72 | $ftp->message =~ /unique file name:\s*(\S*)\s*\)/ &&
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73 | (${*$ftp}{'net_ftp_unique'} = $1);
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74 |
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75 | $ftp->status == CMD_OK;
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76 | }
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77 |
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78 | sub _select {
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79 | my ($data, $timeout, $do_read) = @_;
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80 | my ($rin,$rout,$win,$wout,$tout,$nfound);
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81 |
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82 | vec($rin='',fileno($data),1) = 1;
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83 |
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84 | ($win, $rin) = ($rin, $win) unless $do_read;
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85 |
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86 | while (1) {
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87 | $nfound = select($rout=$rin, $wout=$win, undef, $tout=$timeout);
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88 |
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89 | last if $nfound >= 0;
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90 |
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91 | croak "select: $!"
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92 | unless $!{EINTR};
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93 | }
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94 |
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95 | $nfound;
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96 | }
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97 |
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98 | sub can_read
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99 | {
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100 | _select(@_[0,1],1);
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101 | }
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102 |
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103 | sub can_write
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104 | {
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105 | _select(@_[0,1],0);
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106 | }
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107 |
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108 | sub cmd
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109 | {
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110 | my $ftp = shift;
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111 |
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112 | ${*$ftp}{'net_ftp_cmd'};
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113 | }
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114 |
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115 | sub bytes_read {
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116 | my $ftp = shift;
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117 |
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118 | ${*$ftp}{'net_ftp_bytesread'} || 0;
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119 | }
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120 |
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121 | 1;
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