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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