531 lines
14 KiB
Perl
531 lines
14 KiB
Perl
package Qpsmtpd;
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use strict;
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use vars qw($VERSION $Logger $TraceLevel $Spool_dir $Size_threshold);
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use Sys::Hostname;
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use Qpsmtpd::Constants;
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$VERSION = "0.40";
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sub version { $VERSION };
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sub TRACE_LEVEL { $TraceLevel }; # leave for plugin compatibility
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sub load_logging {
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# need to do this differently that other plugins so as to
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# not trigger logging activity
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my $self = shift;
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return if $self->{hooks}->{"logging"};
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my $configdir = $self->config_dir("logging");
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my $configfile = "$configdir/logging";
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my @loggers = $self->_config_from_file($configfile,'logging');
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$configdir = $self->config_dir('plugin_dirs');
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$configfile = "$configdir/plugin_dirs";
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my @plugin_dirs = $self->_config_from_file($configfile,'plugin_dirs');
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unless (@plugin_dirs) {
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my ($name) = ($0 =~ m!(.*?)/([^/]+)$!);
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@plugin_dirs = ( "$name/plugins" );
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}
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my @loaded;
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for my $logger (@loggers) {
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push @loaded, $self->_load_plugin($logger, @plugin_dirs);
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}
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foreach my $logger (@loaded) {
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$self->log(LOGINFO, "Loaded $logger");
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}
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return @loggers;
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}
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sub trace_level {
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my $self = shift;
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return $TraceLevel if $TraceLevel;
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my $configdir = $self->config_dir("loglevel");
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my $configfile = "$configdir/loglevel";
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$TraceLevel = $self->_config_from_file($configfile,'loglevel');
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unless (defined($TraceLevel) and $TraceLevel =~ /^\d+$/) {
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$TraceLevel = LOGWARN; # Default if no loglevel file found.
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}
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return $TraceLevel;
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}
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sub init_logger { # needed for compatibility purposes
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shift->trace_level();
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}
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sub log {
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my ($self, $trace, @log) = @_;
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$self->varlog($trace,join(" ",@log));
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}
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sub varlog {
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my ($self, $trace) = (shift,shift);
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my ($hook, $plugin, @log);
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if ( $#_ == 0 ) { # log itself
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(@log) = @_;
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}
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elsif ( $#_ == 1 ) { # plus the hook
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($hook, @log) = @_;
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}
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else { # called from plugin
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($hook, $plugin, @log) = @_;
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}
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$self->load_logging; # in case we already don't have this loaded yet
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my ($rc) = $self->run_hooks("logging", $trace, $hook, $plugin, @log);
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unless ( $rc and $rc == DECLINED or $rc == OK ) {
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# no logging plugins registered so fall back to STDERR
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warn join(" ", $$ .
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(defined $plugin ? " $plugin plugin:" :
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defined $hook ? " running plugin ($hook):" : ""),
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@log), "\n"
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if $trace <= $self->trace_level();
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}
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}
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#
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# method to get the configuration. It just calls get_qmail_config by
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# default, but it could be overwritten to look configuration up in a
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# database or whatever.
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#
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sub config {
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my ($self, $c, $type) = @_;
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#warn "SELF->config($c) ", ref $self;
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my %defaults = (
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me => hostname,
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timeout => 1200,
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);
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my ($rc, @config) = $self->run_hooks("config", $c);
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@config = () unless $rc == OK;
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if (wantarray) {
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@config = $self->get_qmail_config($c, $type) unless @config;
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@config = $defaults{$c} if (!@config and $defaults{$c});
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return @config;
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}
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else {
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return ($config[0] || $self->get_qmail_config($c, $type) || $defaults{$c});
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}
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}
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sub config_dir {
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my ($self, $config) = @_;
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my $configdir = ($ENV{QMAIL} || '/var/qmail') . '/control';
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my ($path) = ($ENV{PROCESS} ? $ENV{PROCESS} : $0) =~ m!(.*?)/([^/]+)$!;
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$configdir = "$path/config" if (-e "$path/config/$config");
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if (exists $ENV{QPSMTPD_CONFIG}) {
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$ENV{QPSMTPD_CONFIG} =~ /^(.*)$/; # detaint
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$configdir = $1 if -e "$1/$config";
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}
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return $configdir;
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}
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sub plugin_dirs {
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my $self = shift;
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my @plugin_dirs = $self->config('plugin_dirs');
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unless (@plugin_dirs) {
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my ($path) = ($ENV{PROCESS} ? $ENV{PROCESS} : $0) =~ m!(.*?)/([^/]+)$!;
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@plugin_dirs = ( "$path/plugins" );
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}
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return @plugin_dirs;
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}
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sub get_qmail_config {
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my ($self, $config, $type) = @_;
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$self->log(LOGDEBUG, "trying to get config for $config");
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if ($self->{_config_cache}->{$config}) {
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return wantarray ? @{$self->{_config_cache}->{$config}} : $self->{_config_cache}->{$config}->[0];
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}
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my $configdir = $self->config_dir($config);
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my $configfile = "$configdir/$config";
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if ($type and $type eq "map") {
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return +{} unless -e $configfile . ".cdb";
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eval { require CDB_File };
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if ($@) {
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$self->log(LOGERROR, "No CDB Support! Did NOT read $configfile.cdb, could not load CDB_File module: $@");
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return +{};
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}
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my %h;
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unless (tie(%h, 'CDB_File', "$configfile.cdb")) {
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$self->log(LOGERROR, "tie of $configfile.cdb failed: $!");
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return +{};
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}
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#warn Data::Dumper->Dump([\%h], [qw(h)]);
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# should we cache this?
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return \%h;
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}
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return $self->_config_from_file($configfile, $config);
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}
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sub _config_from_file {
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my ($self, $configfile, $config, $visited) = @_;
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return unless -e $configfile;
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$visited ||= [];
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push @{$visited}, $configfile;
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open CF, "<$configfile" or warn "$$ could not open configfile $configfile: $!" and return;
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my @config = <CF>;
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chomp @config;
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@config = grep { length($_) and $_ !~ m/^\s*#/ and $_ =~ m/\S/} @config;
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close CF;
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my $pos = 0;
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while ($pos < @config) {
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# recursively pursue an $include reference, if found. An inclusion which
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# begins with a leading slash is interpreted as a path to a file and will
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# supercede the usual config path resolution. Otherwise, the normal
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# config_dir() lookup is employed (the location in which the inclusion
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# appeared receives no special precedence; possibly it should, but it'd
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# be complicated beyond justifiability for so simple a config system.
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if ($config[$pos] =~ /^\s*\$include\s+(\S+)\s*$/) {
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my ($includedir, $inclusion) = ('', $1);
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splice @config, $pos, 1; # remove the $include line
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if ($inclusion !~ /^\//) {
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$includedir = $self->config_dir($inclusion);
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$inclusion = "$includedir/$inclusion";
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}
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if (grep($_ eq $inclusion, @{$visited})) {
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$self->log(LOGERROR, "Circular \$include reference in config $config:");
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$self->log(LOGERROR, "From $visited->[0]:");
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$self->log(LOGERROR, " includes $_")
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for (@{$visited}[1..$#{$visited}], $inclusion);
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return wantarray ? () : undef;
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}
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push @{$visited}, $inclusion;
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for my $inc ($self->expand_inclusion_($inclusion, $configfile)) {
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my @insertion = $self->_config_from_file($inc, $config, $visited);
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splice @config, $pos, 0, @insertion; # insert the inclusion
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$pos += @insertion;
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}
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} else {
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$pos++;
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}
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}
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$self->{_config_cache}->{$config} = \@config;
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return wantarray ? @config : $config[0];
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}
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sub expand_inclusion_ {
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my $self = shift;
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my $inclusion = shift;
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my $context = shift;
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my @includes;
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if (-d $inclusion) {
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$self->log(LOGDEBUG, "inclusion of directory $inclusion from $context");
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if (opendir(INCD, $inclusion)) {
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@includes = map { "$inclusion/$_" }
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(grep { -f "$inclusion/$_" and !/^\./ } readdir INCD);
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closedir INCD;
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} else {
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$self->log(LOGERROR, "Couldn't open directory $inclusion,".
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" referenced from $context ($!)");
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}
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} else {
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$self->log(LOGDEBUG, "inclusion of file $inclusion from $context");
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@includes = ( $inclusion );
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}
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return @includes;
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}
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sub load_plugins {
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my $self = shift;
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$self->log(LOGWARN, "Plugins already loaded") if $self->{hooks};
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$self->{hooks} = {};
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my @plugins = $self->config('plugins');
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my @loaded;
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for my $plugin_line (@plugins) {
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my $this_plugin = $self->_load_plugin($plugin_line, $self->plugin_dirs);
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push @loaded, $this_plugin if $this_plugin;
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}
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return @loaded;
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}
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sub _load_plugin {
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my $self = shift;
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my ($plugin_line, @plugin_dirs) = @_;
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my ($plugin, @args) = split ' ', $plugin_line;
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my $package;
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if ($plugin =~ m/::/) {
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# "full" package plugin (My::Plugin)
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$package = $plugin;
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$package =~ s/[^_a-z0-9:]+//gi;
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my $eval = qq[require $package;\n]
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.qq[sub ${plugin}::plugin_name { '$plugin' }];
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$eval =~ m/(.*)/s;
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$eval = $1;
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eval $eval;
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die "Failed loading $package - eval $@" if $@;
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$self->log(LOGDEBUG, "Loading $package ($plugin_line)")
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unless $plugin_line =~ /logging/;
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}
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else {
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# regular plugins/$plugin plugin
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my $plugin_name = $plugin;
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$plugin =~ s/:\d+$//; # after this point, only used for filename
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# Escape everything into valid perl identifiers
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$plugin_name =~ s/([^A-Za-z0-9_\/])/sprintf("_%2x",unpack("C",$1))/eg;
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# second pass cares for slashes and words starting with a digit
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$plugin_name =~ s{
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(/+) # directory
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(\d?) # package's first character
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}[
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"::" . (length $2 ? sprintf("_%2x",unpack("C",$2)) : "")
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]egx;
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$package = "Qpsmtpd::Plugin::$plugin_name";
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# don't reload plugins if they are already loaded
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unless ( defined &{"${package}::plugin_name"} ) {
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PLUGIN_DIR: for my $dir (@plugin_dirs) {
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if (-e "$dir/$plugin") {
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Qpsmtpd::Plugin->compile($plugin_name, $package,
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"$dir/$plugin", $self->{_test_mode}, $plugin);
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$self->log(LOGDEBUG, "Loading $plugin_line from $dir/$plugin")
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unless $plugin_line =~ /logging/;
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last PLUGIN_DIR;
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}
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}
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}
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}
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my $plug = $package->new();
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$plug->_register($self, @args);
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return $plug;
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}
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sub transaction {
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return {}; # base class implements empty transaction
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}
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sub run_hooks {
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my ($self, $hook) = (shift, shift);
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my $hooks = $self->{hooks};
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if ($hooks->{$hook}) {
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my @r;
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my @local_hooks = @{$hooks->{$hook}};
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$self->{_continuation} = [$hook, [@_], @local_hooks];
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return $self->run_continuation();
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}
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return $self->hook_responder($hook, [0, ''], [@_]);
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}
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sub run_continuation {
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my $self = shift;
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die "No continuation in progress" unless $self->{_continuation};
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$self->continue_read() if $self->isa('Danga::Client');
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my $todo = $self->{_continuation};
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$self->{_continuation} = undef;
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my $hook = shift @$todo || die "No hook in the continuation";
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my $args = shift @$todo || die "No hook args in the continuation";
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my @r;
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while (@$todo) {
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my $code = shift @$todo;
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if ( $hook eq 'logging' ) { # without calling $self->log()
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eval { (@r) = $code->{code}->($self, $self->transaction, @$args); };
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$@ and warn("FATAL LOGGING PLUGIN ERROR: ", $@) and next;
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}
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else {
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$self->varlog(LOGDEBUG, $hook, $code->{name});
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eval { (@r) = $code->{code}->($self, $self->transaction, @$args); };
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$@ and $self->log(LOGCRIT, "FATAL PLUGIN ERROR: ", $@) and next;
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!defined $r[0]
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and $self->log(LOGERROR, "plugin ".$code->{name}
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." running the $hook hook returned undef!")
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and next;
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if ($self->transaction) {
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my $tnotes = $self->transaction->notes( $code->{name} );
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$tnotes->{"hook_$hook"}->{'return'} = $r[0]
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if (!defined $tnotes || ref $tnotes eq "HASH");
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}
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else {
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my $cnotes = $self->connection->notes( $code->{name} );
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$cnotes->{"hook_$hook"}->{'return'} = $r[0]
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if (!defined $cnotes || ref $cnotes eq "HASH");
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}
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if ($r[0] == YIELD) {
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$self->pause_read() if $self->isa('Danga::Client');
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$self->{_continuation} = [$hook, $args, @$todo];
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return @r;
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}
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elsif ($r[0] == DENY or $r[0] == DENYSOFT or
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$r[0] == DENY_DISCONNECT or $r[0] == DENYSOFT_DISCONNECT)
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{
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$r[1] = "" if not defined $r[1];
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$self->log(LOGDEBUG, "Plugin ".$code->{name}.
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", hook $hook returned ".return_code($r[0]).", $r[1]");
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$self->run_hooks("deny", $code->{name}, $r[0], $r[1]) unless ($hook eq "deny");
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}
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else {
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$r[1] = "" if not defined $r[1];
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$self->log(LOGDEBUG, "Plugin ".$code->{name}.
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", hook $hook returned ".return_code($r[0]).", $r[1]");
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$self->run_hooks("ok", $code->{name}, $r[0], $r[1]) unless ($hook eq "ok");
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}
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}
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last unless $r[0] == DECLINED;
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}
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$r[0] = DECLINED if not defined $r[0];
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@r = map { split /\n/ } @r;
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return $self->hook_responder($hook, \@r, $args);
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}
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sub hook_responder {
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my ($self, $hook, $msg, $args) = @_;
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my $code = shift @$msg;
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my $responder = $hook . '_respond';
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if (my $meth = $self->can($responder)) {
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return $meth->($self, $code, $msg, $args);
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}
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return $code, @$msg;
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}
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sub _register_hook {
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my $self = shift;
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my ($hook, $code, $unshift) = @_;
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my $hooks = $self->{hooks};
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if ($unshift) {
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unshift @{$hooks->{$hook}}, $code;
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}
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else {
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push @{$hooks->{$hook}}, $code;
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}
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}
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sub spool_dir {
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my $self = shift;
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unless ( $Spool_dir ) { # first time through
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$self->log(LOGINFO, "Initializing spool_dir");
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$Spool_dir = $self->config('spool_dir')
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|| Qpsmtpd::Utils::tildeexp('~/tmp/');
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$Spool_dir .= "/" unless ($Spool_dir =~ m!/$!);
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$Spool_dir =~ /^(.+)$/ or die "spool_dir not configured properly";
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$Spool_dir = $1; # cleanse the taint
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# Make sure the spool dir has appropriate rights
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if (-e $Spool_dir) {
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my $mode = (stat($Spool_dir))[2];
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$self->log(LOGWARN,
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"Permissions on spool_dir $Spool_dir are not 0700")
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if $mode & 07077;
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}
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# And finally, create it if it doesn't already exist
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-d $Spool_dir or mkdir($Spool_dir, 0700)
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or die "Could not create spool_dir $Spool_dir: $!";
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}
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return $Spool_dir;
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}
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# For unique filenames. We write to a local tmp dir so we don't need
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# to make them unpredictable.
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my $transaction_counter = 0;
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sub temp_file {
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my $self = shift;
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my $filename = $self->spool_dir()
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. join(":", time, $$, $transaction_counter++);
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return $filename;
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}
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sub temp_dir {
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my $self = shift;
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my $mask = shift || 0700;
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my $dirname = $self->temp_file();
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-d $dirname or mkdir($dirname, $mask)
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or die "Could not create temporary directory $dirname: $!";
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return $dirname;
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}
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sub size_threshold {
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my $self = shift;
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unless ( defined $Size_threshold ) {
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$Size_threshold = $self->config('size_threshold') || 0;
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$self->log(LOGNOTICE, "size_threshold set to $Size_threshold");
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}
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return $Size_threshold;
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}
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sub authenticated {
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my $self = shift;
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return (defined $self->{_auth} ? $self->{_auth} : "" );
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}
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sub auth_user {
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my $self = shift;
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return (defined $self->{_auth_user} ? $self->{_auth_user} : "" );
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}
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sub auth_mechanism {
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my $self = shift;
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return (defined $self->{_auth_mechanism} ? $self->{_auth_mechanism} : "" );
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}
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1;
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__END__
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=head1 NAME
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Qpsmtpd
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=head1 DESCRIPTION
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This is the base class for the qpsmtpd mail server. See
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L<http://smtpd.develooper.com/> and the I<README> file for more information.
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=head1 COPYRIGHT
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Copyright 2001-2005 Ask Bjoern Hansen, Develooper LLC. See the
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LICENSE file for more information.
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