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+# Net::POP3.pm
+#
+# Copyright (c) 1995-2004 Graham Barr <gbarr@pobox.com>. All rights reserved.
+# This program is free software; you can redistribute it and/or
+# modify it under the same terms as Perl itself.
+
+package Net::POP3;
+
+use strict;
+use IO::Socket;
+use vars qw(@ISA $VERSION $debug);
+use Net::Cmd;
+use Carp;
+use Net::Config;
+
+$VERSION = "2.29";
+
+@ISA = qw(Net::Cmd IO::Socket::INET);
+
+
+sub new {
+ my $self = shift;
+ my $type = ref($self) || $self;
+ my ($host, %arg);
+ if (@_ % 2) {
+ $host = shift;
+ %arg = @_;
+ }
+ else {
+ %arg = @_;
+ $host = delete $arg{Host};
+ }
+ my $hosts = defined $host ? [$host] : $NetConfig{pop3_hosts};
+ my $obj;
+ my @localport = exists $arg{ResvPort} ? (LocalPort => $arg{ResvPort}) : ();
+
+ my $h;
+ foreach $h (@{$hosts}) {
+ $obj = $type->SUPER::new(
+ PeerAddr => ($host = $h),
+ PeerPort => $arg{Port} || 'pop3(110)',
+ Proto => 'tcp',
+ @localport,
+ Timeout => defined $arg{Timeout}
+ ? $arg{Timeout}
+ : 120
+ )
+ and last;
+ }
+
+ return undef
+ unless defined $obj;
+
+ ${*$obj}{'net_pop3_host'} = $host;
+
+ $obj->autoflush(1);
+ $obj->debug(exists $arg{Debug} ? $arg{Debug} : undef);
+
+ unless ($obj->response() == CMD_OK) {
+ $obj->close();
+ return undef;
+ }
+
+ ${*$obj}{'net_pop3_banner'} = $obj->message;
+
+ $obj;
+}
+
+
+sub host {
+ my $me = shift;
+ ${*$me}{'net_pop3_host'};
+}
+
+##
+## We don't want people sending me their passwords when they report problems
+## now do we :-)
+##
+
+
+sub debug_text { $_[2] =~ /^(pass|rpop)/i ? "$1 ....\n" : $_[2]; }
+
+
+sub login {
+ @_ >= 1 && @_ <= 3 or croak 'usage: $pop3->login( USER, PASS )';
+ my ($me, $user, $pass) = @_;
+
+ if (@_ <= 2) {
+ ($user, $pass) = $me->_lookup_credentials($user);
+ }
+
+ $me->user($user)
+ and $me->pass($pass);
+}
+
+
+sub apop {
+ @_ >= 1 && @_ <= 3 or croak 'usage: $pop3->apop( USER, PASS )';
+ my ($me, $user, $pass) = @_;
+ my $banner;
+ my $md;
+
+ if (eval { local $SIG{__DIE__}; require Digest::MD5 }) {
+ $md = Digest::MD5->new();
+ }
+ elsif (eval { local $SIG{__DIE__}; require MD5 }) {
+ $md = MD5->new();
+ }
+ else {
+ carp "You need to install Digest::MD5 or MD5 to use the APOP command";
+ return undef;
+ }
+
+ return undef
+ unless ($banner = (${*$me}{'net_pop3_banner'} =~ /(<.*>)/)[0]);
+
+ if (@_ <= 2) {
+ ($user, $pass) = $me->_lookup_credentials($user);
+ }
+
+ $md->add($banner, $pass);
+
+ return undef
+ unless ($me->_APOP($user, $md->hexdigest));
+
+ $me->_get_mailbox_count();
+}
+
+
+sub user {
+ @_ == 2 or croak 'usage: $pop3->user( USER )';
+ $_[0]->_USER($_[1]) ? 1 : undef;
+}
+
+
+sub pass {
+ @_ == 2 or croak 'usage: $pop3->pass( PASS )';
+
+ my ($me, $pass) = @_;
+
+ return undef
+ unless ($me->_PASS($pass));
+
+ $me->_get_mailbox_count();
+}
+
+
+sub reset {
+ @_ == 1 or croak 'usage: $obj->reset()';
+
+ my $me = shift;
+
+ return 0
+ unless ($me->_RSET);
+
+ if (defined ${*$me}{'net_pop3_mail'}) {
+ local $_;
+ foreach (@{${*$me}{'net_pop3_mail'}}) {
+ delete $_->{'net_pop3_deleted'};
+ }
+ }
+}
+
+
+sub last {
+ @_ == 1 or croak 'usage: $obj->last()';
+
+ return undef
+ unless $_[0]->_LAST && $_[0]->message =~ /(\d+)/;
+
+ return $1;
+}
+
+
+sub top {
+ @_ == 2 || @_ == 3 or croak 'usage: $pop3->top( MSGNUM [, NUMLINES ])';
+ my $me = shift;
+
+ return undef
+ unless $me->_TOP($_[0], $_[1] || 0);
+
+ $me->read_until_dot;
+}
+
+
+sub popstat {
+ @_ == 1 or croak 'usage: $pop3->popstat()';
+ my $me = shift;
+
+ return ()
+ unless $me->_STAT && $me->message =~ /(\d+)\D+(\d+)/;
+
+ ($1 || 0, $2 || 0);
+}
+
+
+sub list {
+ @_ == 1 || @_ == 2 or croak 'usage: $pop3->list( [ MSGNUM ] )';
+ my $me = shift;
+
+ return undef
+ unless $me->_LIST(@_);
+
+ if (@_) {
+ $me->message =~ /\d+\D+(\d+)/;
+ return $1 || undef;
+ }
+
+ my $info = $me->read_until_dot
+ or return undef;
+
+ my %hash = map { (/(\d+)\D+(\d+)/) } @$info;
+
+ return \%hash;
+}
+
+
+sub get {
+ @_ == 2 or @_ == 3 or croak 'usage: $pop3->get( MSGNUM [, FH ])';
+ my $me = shift;
+
+ return undef
+ unless $me->_RETR(shift);
+
+ $me->read_until_dot(@_);
+}
+
+
+sub getfh {
+ @_ == 2 or croak 'usage: $pop3->getfh( MSGNUM )';
+ my $me = shift;
+
+ return unless $me->_RETR(shift);
+ return $me->tied_fh;
+}
+
+
+sub delete {
+ @_ == 2 or croak 'usage: $pop3->delete( MSGNUM )';
+ my $me = shift;
+ return 0 unless $me->_DELE(@_);
+ ${*$me}{'net_pop3_deleted'} = 1;
+}
+
+
+sub uidl {
+ @_ == 1 || @_ == 2 or croak 'usage: $pop3->uidl( [ MSGNUM ] )';
+ my $me = shift;
+ my $uidl;
+
+ $me->_UIDL(@_)
+ or return undef;
+ if (@_) {
+ $uidl = ($me->message =~ /\d+\s+([\041-\176]+)/)[0];
+ }
+ else {
+ my $ref = $me->read_until_dot
+ or return undef;
+ my $ln;
+ $uidl = {};
+ foreach $ln (@$ref) {
+ my ($msg, $uid) = $ln =~ /^\s*(\d+)\s+([\041-\176]+)/;
+ $uidl->{$msg} = $uid;
+ }
+ }
+ return $uidl;
+}
+
+
+sub ping {
+ @_ == 2 or croak 'usage: $pop3->ping( USER )';
+ my $me = shift;
+
+ return () unless $me->_PING(@_) && $me->message =~ /(\d+)\D+(\d+)/;
+
+ ($1 || 0, $2 || 0);
+}
+
+
+sub _lookup_credentials {
+ my ($me, $user) = @_;
+
+ require Net::Netrc;
+
+ $user ||= eval { local $SIG{__DIE__}; (getpwuid($>))[0] }
+ || $ENV{NAME}
+ || $ENV{USER}
+ || $ENV{LOGNAME};
+
+ my $m = Net::Netrc->lookup(${*$me}{'net_pop3_host'}, $user);
+ $m ||= Net::Netrc->lookup(${*$me}{'net_pop3_host'});
+
+ my $pass = $m
+ ? $m->password || ""
+ : "";
+
+ ($user, $pass);
+}
+
+
+sub _get_mailbox_count {
+ my ($me) = @_;
+ my $ret = ${*$me}{'net_pop3_count'} =
+ ($me->message =~ /(\d+)\s+message/io) ? $1 : ($me->popstat)[0];
+
+ $ret ? $ret : "0E0";
+}
+
+
+sub _STAT { shift->command('STAT')->response() == CMD_OK }
+sub _LIST { shift->command('LIST', @_)->response() == CMD_OK }
+sub _RETR { shift->command('RETR', $_[0])->response() == CMD_OK }
+sub _DELE { shift->command('DELE', $_[0])->response() == CMD_OK }
+sub _NOOP { shift->command('NOOP')->response() == CMD_OK }
+sub _RSET { shift->command('RSET')->response() == CMD_OK }
+sub _QUIT { shift->command('QUIT')->response() == CMD_OK }
+sub _TOP { shift->command('TOP', @_)->response() == CMD_OK }
+sub _UIDL { shift->command('UIDL', @_)->response() == CMD_OK }
+sub _USER { shift->command('USER', $_[0])->response() == CMD_OK }
+sub _PASS { shift->command('PASS', $_[0])->response() == CMD_OK }
+sub _APOP { shift->command('APOP', @_)->response() == CMD_OK }
+sub _PING { shift->command('PING', $_[0])->response() == CMD_OK }
+
+
+sub _RPOP { shift->command('RPOP', $_[0])->response() == CMD_OK }
+sub _LAST { shift->command('LAST')->response() == CMD_OK }
+
+
+sub _CAPA { shift->command('CAPA')->response() == CMD_OK }
+
+
+sub quit {
+ my $me = shift;
+
+ $me->_QUIT;
+ $me->close;
+}
+
+
+sub DESTROY {
+ my $me = shift;
+
+ if (defined fileno($me) and ${*$me}{'net_pop3_deleted'}) {
+ $me->reset;
+ $me->quit;
+ }
+}
+
+##
+## POP3 has weird responses, so we emulate them to look the same :-)
+##
+
+
+sub response {
+ my $cmd = shift;
+ my $str = $cmd->getline() or return undef;
+ my $code = "500";
+
+ $cmd->debug_print(0, $str)
+ if ($cmd->debug);
+
+ if ($str =~ s/^\+OK\s*//io) {
+ $code = "200";
+ }
+ elsif ($str =~ s/^\+\s*//io) {
+ $code = "300";
+ }
+ else {
+ $str =~ s/^-ERR\s*//io;
+ }
+
+ ${*$cmd}{'net_cmd_resp'} = [$str];
+ ${*$cmd}{'net_cmd_code'} = $code;
+
+ substr($code, 0, 1);
+}
+
+
+sub capa {
+ my $this = shift;
+ my ($capa, %capabilities);
+
+ # Fake a capability here
+ $capabilities{APOP} = '' if ($this->banner() =~ /<.*>/);
+
+ if ($this->_CAPA()) {
+ $capabilities{CAPA} = 1;
+ $capa = $this->read_until_dot();
+ %capabilities = (%capabilities, map {/^\s*(\S+)\s*(.*)/} @$capa);
+ }
+ else {
+
+ # Check AUTH for SASL capabilities
+ if ($this->command('AUTH')->response() == CMD_OK) {
+ my $mechanism = $this->read_until_dot();
+ $capabilities{SASL} = join " ", map {m/([A-Z0-9_-]+)/} @{$mechanism};
+ }
+ }
+
+ return ${*$this}{'net_pop3e_capabilities'} = \%capabilities;
+}
+
+
+sub capabilities {
+ my $this = shift;
+
+ ${*$this}{'net_pop3e_capabilities'} || $this->capa;
+}
+
+
+sub auth {
+ my ($self, $username, $password) = @_;
+
+ eval {
+ require MIME::Base64;
+ require Authen::SASL;
+ } or $self->set_status(500, ["Need MIME::Base64 and Authen::SASL todo auth"]), return 0;
+
+ my $capa = $self->capa;
+ my $mechanisms = $capa->{SASL} || 'CRAM-MD5';
+
+ my $sasl;
+
+ if (ref($username) and UNIVERSAL::isa($username, 'Authen::SASL')) {
+ $sasl = $username;
+ my $user_mech = $sasl->mechanism || '';
+ my @user_mech = split(/\s+/, $user_mech);
+ my %user_mech;
+ @user_mech{@user_mech} = ();
+
+ my @server_mech = split(/\s+/, $mechanisms);
+ my @mech = @user_mech
+ ? grep { exists $user_mech{$_} } @server_mech
+ : @server_mech;
+ unless (@mech) {
+ $self->set_status(
+ 500,
+ [ 'Client SASL mechanisms (',
+ join(', ', @user_mech),
+ ') do not match the SASL mechnism the server announces (',
+ join(', ', @server_mech), ')',
+ ]
+ );
+ return 0;
+ }
+
+ $sasl->mechanism(join(" ", @mech));
+ }
+ else {
+ die "auth(username, password)" if not length $username;
+ $sasl = Authen::SASL->new(
+ mechanism => $mechanisms,
+ callback => {
+ user => $username,
+ pass => $password,
+ authname => $username,
+ }
+ );
+ }
+
+ # We should probably allow the user to pass the host, but I don't
+ # currently know and SASL mechanisms that are used by smtp that need it
+ my ($hostname) = split /:/, ${*$self}{'net_pop3_host'};
+ my $client = eval { $sasl->client_new('pop', $hostname, 0) };
+
+ unless ($client) {
+ my $mech = $sasl->mechanism;
+ $self->set_status(
+ 500,
+ [ " Authen::SASL failure: $@",
+ '(please check if your local Authen::SASL installation',
+ "supports mechanism '$mech'"
+ ]
+ );
+ return 0;
+ }
+
+ my ($token) = $client->client_start
+ or do {
+ my $mech = $client->mechanism;
+ $self->set_status(
+ 500,
+ [ ' Authen::SASL failure: $client->client_start ',
+ "mechanism '$mech' hostname #$hostname#",
+ $client->error
+ ]
+ );
+ return 0;
+ };
+
+ # We dont support sasl mechanisms that encrypt the socket traffic.
+ # todo that we would really need to change the ISA hierarchy
+ # so we dont inherit from IO::Socket, but instead hold it in an attribute
+
+ my @cmd = ("AUTH", $client->mechanism);
+ my $code;
+
+ push @cmd, MIME::Base64::encode_base64($token, '')
+ if defined $token and length $token;
+
+ while (($code = $self->command(@cmd)->response()) == CMD_MORE) {
+
+ my ($token) = $client->client_step(MIME::Base64::decode_base64(($self->message)[0])) or do {
+ $self->set_status(
+ 500,
+ [ ' Authen::SASL failure: $client->client_step ',
+ "mechanism '", $client->mechanism, " hostname #$hostname#, ",
+ $client->error
+ ]
+ );
+ return 0;
+ };
+
+ @cmd = (MIME::Base64::encode_base64(defined $token ? $token : '', ''));
+ }
+
+ $code == CMD_OK;
+}
+
+
+sub banner {
+ my $this = shift;
+
+ return ${*$this}{'net_pop3_banner'};
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+Net::POP3 - Post Office Protocol 3 Client class (RFC1939)
+
+=head1 SYNOPSIS
+
+ use Net::POP3;
+
+ # Constructors
+ $pop = Net::POP3->new('pop3host');
+ $pop = Net::POP3->new('pop3host', Timeout => 60);
+
+ if ($pop->login($username, $password) > 0) {
+ my $msgnums = $pop->list; # hashref of msgnum => size
+ foreach my $msgnum (keys %$msgnums) {
+ my $msg = $pop->get($msgnum);
+ print @$msg;
+ $pop->delete($msgnum);
+ }
+ }
+
+ $pop->quit;
+
+=head1 DESCRIPTION
+
+This module implements a client interface to the POP3 protocol, enabling
+a perl5 application to talk to POP3 servers. This documentation assumes
+that you are familiar with the POP3 protocol described in RFC1939.
+
+A new Net::POP3 object must be created with the I<new> method. Once
+this has been done, all POP3 commands are accessed via method calls
+on the object.
+
+=head1 CONSTRUCTOR
+
+=over 4
+
+=item new ( [ HOST ] [, OPTIONS ] 0
+
+This is the constructor for a new Net::POP3 object. C<HOST> is the
+name of the remote host to which an POP3 connection is required.
+
+C<HOST> is optional. If C<HOST> is not given then it may instead be
+passed as the C<Host> option described below. If neither is given then
+the C<POP3_Hosts> specified in C<Net::Config> will be used.
+
+C<OPTIONS> are passed in a hash like fashion, using key and value pairs.
+Possible options are:
+
+B<Host> - POP3 host to connect to. It may be a single scalar, as defined for
+the C<PeerAddr> option in L<IO::Socket::INET>, or a reference to
+an array with hosts to try in turn. The L</host> method will return the value
+which was used to connect to the host.
+
+B<ResvPort> - If given then the socket for the C<Net::POP3> object
+will be bound to the local port given using C<bind> when the socket is
+created.
+
+B<Timeout> - Maximum time, in seconds, to wait for a response from the
+POP3 server (default: 120)
+
+B<Debug> - Enable debugging information
+
+=back
+
+=head1 METHODS
+
+Unless otherwise stated all methods return either a I<true> or I<false>
+value, with I<true> meaning that the operation was a success. When a method
+states that it returns a value, failure will be returned as I<undef> or an
+empty list.
+
+=over 4
+
+=item auth ( USERNAME, PASSWORD )
+
+Attempt SASL authentication.
+
+=item user ( USER )
+
+Send the USER command.
+
+=item pass ( PASS )
+
+Send the PASS command. Returns the number of messages in the mailbox.
+
+=item login ( [ USER [, PASS ]] )
+
+Send both the USER and PASS commands. If C<PASS> is not given the
+C<Net::POP3> uses C<Net::Netrc> to lookup the password using the host
+and username. If the username is not specified then the current user name
+will be used.
+
+Returns the number of messages in the mailbox. However if there are no
+messages on the server the string C<"0E0"> will be returned. This is
+will give a true value in a boolean context, but zero in a numeric context.
+
+If there was an error authenticating the user then I<undef> will be returned.
+
+=item apop ( [ USER [, PASS ]] )
+
+Authenticate with the server identifying as C<USER> with password C<PASS>.
+Similar to L</login>, but the password is not sent in clear text.
+
+To use this method you must have the Digest::MD5 or the MD5 module installed,
+otherwise this method will return I<undef>.
+
+=item banner ()
+
+Return the sever's connection banner
+
+=item capa ()
+
+Return a reference to a hash of the capabilities of the server. APOP
+is added as a pseudo capability. Note that I've been unable to
+find a list of the standard capability values, and some appear to
+be multi-word and some are not. We make an attempt at intelligently
+parsing them, but it may not be correct.
+
+=item capabilities ()
+
+Just like capa, but only uses a cache from the last time we asked
+the server, so as to avoid asking more than once.
+
+=item top ( MSGNUM [, NUMLINES ] )
+
+Get the header and the first C<NUMLINES> of the body for the message
+C<MSGNUM>. Returns a reference to an array which contains the lines of text
+read from the server.
+
+=item list ( [ MSGNUM ] )
+
+If called with an argument the C<list> returns the size of the message
+in octets.
+
+If called without arguments a reference to a hash is returned. The
+keys will be the C<MSGNUM>'s of all undeleted messages and the values will
+be their size in octets.
+
+=item get ( MSGNUM [, FH ] )
+
+Get the message C<MSGNUM> from the remote mailbox. If C<FH> is not given
+then get returns a reference to an array which contains the lines of
+text read from the server. If C<FH> is given then the lines returned
+from the server are printed to the filehandle C<FH>.
+
+=item getfh ( MSGNUM )
+
+As per get(), but returns a tied filehandle. Reading from this
+filehandle returns the requested message. The filehandle will return
+EOF at the end of the message and should not be reused.
+
+=item last ()
+
+Returns the highest C<MSGNUM> of all the messages accessed.
+
+=item popstat ()
+
+Returns a list of two elements. These are the number of undeleted
+elements and the size of the mbox in octets.
+
+=item ping ( USER )
+
+Returns a list of two elements. These are the number of new messages
+and the total number of messages for C<USER>.
+
+=item uidl ( [ MSGNUM ] )
+
+Returns a unique identifier for C<MSGNUM> if given. If C<MSGNUM> is not
+given C<uidl> returns a reference to a hash where the keys are the
+message numbers and the values are the unique identifiers.
+
+=item delete ( MSGNUM )
+
+Mark message C<MSGNUM> to be deleted from the remote mailbox. All messages
+that are marked to be deleted will be removed from the remote mailbox
+when the server connection closed.
+
+=item reset ()
+
+Reset the status of the remote POP3 server. This includes resetting the
+status of all messages to not be deleted.
+
+=item quit ()
+
+Quit and close the connection to the remote POP3 server. Any messages marked
+as deleted will be deleted from the remote mailbox.
+
+=back
+
+=head1 NOTES
+
+If a C<Net::POP3> object goes out of scope before C<quit> method is called
+then the C<reset> method will called before the connection is closed. This
+means that any messages marked to be deleted will not be.
+
+=head1 SEE ALSO
+
+L<Net::Netrc>,
+L<Net::Cmd>
+
+=head1 AUTHOR
+
+Graham Barr <gbarr@pobox.com>
+
+=head1 COPYRIGHT
+
+Copyright (c) 1995-2003 Graham Barr. All rights reserved.
+This program is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
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