qpsmtpd/plugins/parse_addr_withhelo

#!perl -w

=head1 NAME

parse_addr_withhelo

=head1 SYNOPSIS

strict RFC 821 forbids parameters after the

   MAIL FROM:<user@example.net>
 and
   RCPT TO:<someone@example.com>

load this plugin to enforce, else the default EHLO parsing with
parameters is done.

=cut

use strict;
use warnings;

use Qpsmtpd::Constants;

sub hook_mail_parse {
    my $self = shift;
    return OK, \&_parse if $self->qp->connection->hello eq 'helo';
    return DECLINED;
}

sub hook_rcpt_parse {
    my $self = shift;
    return OK, \&_parse if $self->qp->connection->hello eq 'helo';
    return DECLINED;
}

sub _parse {
    my ($self, $cmd, $line) = @_;
    $self->log(LOGDEBUG, "_parse() cmd=[$cmd], line=[$line]");
    if ($cmd eq 'mail') {
        if ($line !~ s/^from:\s*//i) {
            return DENY, "Syntax error in command";
        };
    }
    else {    # cmd eq 'rcpt'
        return DENY, "Syntax error in command" if $line !~ s/^to:\s*//i;
    }

    if ($line =~ s/^(<.*>)\s*//) {
        return DENY, "No parameters allowed in " . uc($cmd) if $line =~ /^\S/;
        return OK, $1;  # $1 is captured address
    }

    ## now, no <> are given
    $line =~ s/\s*$//;
    if ($line =~ /\@/) {
        if ($line =~ /\@\S+\s+\S/) {
            return DENY, "No parameters allowed in " . uc($cmd);
        };
        return OK, $line;
    }

    if ($cmd eq 'mail') {
        return OK, '<>' if !$line;    # 'MAIL FROM:' -> 'MAIL FROM:<>'
        return DENY, "Could not parse your MAIL FROM command";
    }

    if ($line !~ /^(postmaster|abuse)$/i) {
        return DENY, "Could not parse your RCPT TO command";
    };
}