1Net::Cmd(3pm) Perl Programmers Reference Guide Net::Cmd(3pm)
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6 Net::Cmd - Network Command class (as used by FTP, SMTP etc)
7
9 use Net::Cmd;
10 @ISA = qw(Net::Cmd);
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14 "Net::Cmd" is a collection of methods that can be inherited by a sub
15 class of "IO::Handle". These methods implement the functionality
16 required for a command based protocol, for example FTP and SMTP.
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19 These methods provide a user interface to the "Net::Cmd" object.
20 debug ( VALUE )
22 Set the level of debug information for this object. If "VALUE" is
23 not given then the current state is returned. Otherwise the state
24 is changed to "VALUE" and the previous state returned.
25 Different packages may implement different levels of debug but a
27 non-zero value results in copies of all commands and responses also
28 being sent to STDERR.
29 If "VALUE" is "undef" then the debug level will be set to the
31 default debug level for the class.
32 This method can also be called as a static method to set/get the
34 default debug level for a given class.
35 message ()
37 Returns the text message returned from the last command
38 code ()
40 Returns the 3-digit code from the last command. If a command is
41 pending then the value 0 is returned
42 ok ()
44 Returns non-zero if the last code value was greater than zero and
45 less than 400. This holds true for most command servers. Servers
46 where this does not hold may override this method.
47 status ()
49 Returns the most significant digit of the current status code. If a
50 command is pending then "CMD_PENDING" is returned.
51 datasend ( DATA )
53 Send data to the remote server, converting LF to CRLF. Any line
54 starting with a '.' will be prefixed with another '.'. "DATA" may
55 be an array or a reference to an array.
56 dataend ()
58 End the sending of data to the remote server. This is done by
59 ensuring that the data already sent ends with CRLF then sending
60 '.CRLF' to end the transmission. Once this data has been sent
61 "dataend" calls "response" and returns true if "response" returns
62 CMD_OK.
63
65 These methods are not intended to be called by the user, but used or
66 over-ridden by a sub-class of "Net::Cmd"
67 debug_print ( DIR, TEXT )
69 Print debugging information. "DIR" denotes the direction true being
70 data being sent to the server. Calls "debug_text" before printing
71 to STDERR.
72 debug_text ( TEXT )
74 This method is called to print debugging information. TEXT is the
75 text being sent. The method should return the text to be printed
76 This is primarily meant for the use of modules such as FTP where
78 passwords are sent, but we do not want to display them in the
79 debugging information.
80 command ( CMD [, ARGS, ... ])
82 Send a command to the command server. All arguments a first joined
83 with a space character and CRLF is appended, this string is then
84 sent to the command server.
85 Returns undef upon failure
87 unsupported ()
89 Sets the status code to 580 and the response text to 'Unsupported
90 command'. Returns zero.
91 response ()
93 Obtain a response from the server. Upon success the most
94 significant digit of the status code is returned. Upon failure,
95 timeout etc., undef is returned.
96 parse_response ( TEXT )
98 This method is called by "response" as a method with one argument.
99 It should return an array of 2 values, the 3-digit status code and
100 a flag which is true when this is part of a multi-line response and
101 this line is not the list.
102 getline ()
104 Retrieve one line, delimited by CRLF, from the remote server.
105 Returns undef upon failure.
106 NOTE: If you do use this method for any reason, please remember to
108 add some "debug_print" calls into your method.
109 ungetline ( TEXT )
111 Unget a line of text from the server.
112 rawdatasend ( DATA )
114 Send data to the remote server without performing any conversions.
115 "DATA" is a scalar.
116 read_until_dot ()
118 Read data from the remote server until a line consisting of a
119 single '.'. Any lines starting with '..' will have one of the '.'s
120 removed.
121 Returns a reference to a list containing the lines, or undef upon
123 failure.
124 tied_fh ()
126 Returns a filehandle tied to the Net::Cmd object. After issuing a
127 command, you may read from this filehandle using read() or <>. The
128 filehandle will return EOF when the final dot is encountered.
129 Similarly, you may write to the filehandle in order to send data to
130 the server after issuing a command that expects data to be written.
131 See the Net::POP3 and Net::SMTP modules for examples of this.
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135 "Net::Cmd" exports six subroutines, five of these, "CMD_INFO",
136 "CMD_OK", "CMD_MORE", "CMD_REJECT" and "CMD_ERROR", correspond to
137 possible results of "response" and "status". The sixth is
138 "CMD_PENDING".
139
141 Graham Barr <gbarr@pobox.com>
142
144 Copyright (c) 1995-2006 Graham Barr. All rights reserved. This program
145 is free software; you can redistribute it and/or modify it under the
146 same terms as Perl itself.
147perl v5.16.3 2019-01-21 Net::Cmd(3pm)