Populated release branch

1 files changed, 483 insertions, 0 deletions

diff --git a/it_mail.class b/it_mail.class
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+<?php
+/*
+**	$Id$
+**
+**	mail.class - Create a mail object, add header and content and send it
+**
+**	ITools - the Internet Tools Library
+**
+**	Copyright (C) 1995-2003 by the ITools Authors.
+**	This program is free software; you can redistribute it and/or
+**	modify it under the terms of either the GNU General Public License
+**	or the GNU Lesser General Public License, as published by the Free
+**	Software Foundation. See http://www.gnu.org/licenses/ for details.
+*/
+
+define('IT_MAIL_PLAIN', 0);
+define('IT_MAIL_HTML', 1);
+
+/* Return codes of it_mail::check_email() */
+define('IT_MAIL_CHECKEMAIL_INVALID', 0);
+define('IT_MAIL_CHECKEMAIL_MAILBOXFULL', 5);
+define('IT_MAIL_CHECKEMAIL_OK', 10);
+
+/**
+ * Construct an email message with headers, body (plaintext and/or HTML) and
+ * send it. Also provides utility function to check email address validity.<br>
+ * <em>Example:</em><br>
+ * <code><nobr>
+ * if (!it_mail::check_email($to))<br>
+ * &nbsp;&nbsp;&nbsp;&nbsp;die("Invalid email address '$to'\n");<br>
+ * <br>
+ * $mail = new it_mail(array('To' => $to&#44; 'From' => 'itools@gna.ch', 'Subject' => 'Example'));<br>
+ * $mail->add_body('Plain text message body');<br>
+ * $mail->add_body('HTML message with &lt;a href="http://gna.ch/"&gt;link&lt;/a&gt;', IT_MAIL_HTML);<br>
+ * $mail->send();<br>
+ * </nobr></code>
+ */
+class it_mail
+{
+	var $header_names = array();
+	var $header_values = array();
+	var $body = array();
+	var $attachments = array();
+
+	var $to = array();
+	var $subject = "";
+	var $cc = array();
+	var $bcc = array();
+	var $flags = "";
+	var $charset = 'iso-8859-1';
+
+/**
+ * Construct a new email message. Headers and body can be added later.
+ * Note: Headers To, Cc, Bcc can be arrays
+ * @param $headers Array of headers for this email, e.g. From, To and Subject
+ */
+function it_mail($headers = "")
+{
+	if (is_array($headers))
+	{
+		foreach ($headers as $header => $value)
+			$this->add_header($header, $value);
+	}
+}
+
+
+/**
+ * Add header line to the this email message. Can be called repeatedly.
+ * Note: Headers To, Cc, Bcc can be arrays
+ * @param $header Header to be added, e.g. Cc, Bcc or X-My-Header
+ * @param $value Value of header, e.g. itools@gna.ch for Bcc header
+ */
+function add_header($header, $value)
+{
+	$value = $this->header_escape($value);
+
+	switch ($header)
+	{
+		case 'To':
+			if (is_array($value))
+			{
+				foreach ($value as $val)
+					$this->to[] = $val;
+			}
+			else
+				$this->to[] = $value;
+			break;
+
+		case 'Subject':
+			$this->subject .= $value;
+			break;
+
+		case 'Cc':
+			if (is_array($value))
+			{
+				foreach ($value as $val)
+					$this->cc[] = $val;
+			}
+			else
+				$this->cc[] = $value;
+			break;
+
+		case 'Bcc':
+			if (is_array($value))
+			{
+				foreach ($value as $val)
+					$this->bcc[] = $val;
+			}
+			else
+				$this->bcc[] = $value;
+			break;
+
+		case 'charset':
+			$this->charset = $value;
+			break;
+
+		case 'Errors-To':
+			$this->flags = "-f " . escapeshellarg(preg_replace('/.*<([^>]+)>.*/', '$1', $value));
+			/* FALLTHROUGH */
+		default:
+			$this->header_names[] = $header;
+			$this->header_values[] = $value;
+			break;
+	}
+}
+
+
+/**
+ * Add body part to this email message. Can be called repeatedly.
+ * @param $text Text to be added to email message
+ * @param $type Type of text, one of IT_MAIL_PLAIN (default) or IT_MAIL_HTML
+ */
+function add_body($text, $type = IT_MAIL_PLAIN)
+{
+	switch ($type)
+	{
+		case IT_MAIL_PLAIN:
+		case IT_MAIL_HTML:
+			$this->body[$type] .= $text;
+			break;
+
+		default:
+			it::fatal("it_mail::add_body invalid type $type");
+			break;
+	}
+}
+
+
+/**
+ * Add attachment to this email message. Can be called repeatedly.
+ * @param $data Data to be attached
+ * @param $name Name of attached file
+ * @param $mimetype MIME-Type of attached file
+ * @return 'cid:'.Content-ID of this attachment
+ */
+function add_attachment($data, $mimetype = "application/octet-stream", $name = '')
+{
+	if ($name == '')
+		$name = 'Attachment' . (count($this->attachments) + 1);
+
+	$cid = md5(uniqid(rand()));
+	$this->attachments[] = array ('mimetype' => $mimetype, 'data' => $data, 'encode' => $encode, 'name' => $name, 'cid' => $cid);
+
+	return 'cid:'.$cid;
+}
+
+
+/**
+ * Add file attachment to this email message. Can be called repeatedly.
+ * @param $filename File to be attached
+ * @param $name Name of attached file as stored in mail
+ * @param $mimetype MIME-Type of attached file
+ */
+function add_file($filename, $mimetype = "application/octet-stream", $name = '')
+{
+	if ($name == '')
+		$name = basename($filename);
+
+	if ($file = @fopen($filename, "r"))
+	{
+		if ($data = fread($file, @filesize($filename)))
+			$result = $this->add_attachment($data, $mimetype, $name);
+
+		fclose($file);
+	}
+
+	return $result;
+}
+
+
+/**
+ * Send this email message
+ * @return True if mail was sent
+ */
+function send()
+{
+	$to = join(",", $this->to);
+	$headers = array();
+
+	if (count($this->cc) > 0)
+		$headers[] = "Cc: " . join(",", $this->cc);
+
+	if (count($this->bcc) > 0)
+		$headers[] = "Bcc: " . join(",", $this->bcc);
+
+	for ($i = 0; $i < count($this->header_names); $i++)
+		$headers[] = $this->header_names[$i] . ': ' . $this->header_values[$i];
+
+
+	/* Automatically add doctype if none given */
+	if ($this->body[IT_MAIL_HTML] && !eregi('^<!doctype', $this->body[IT_MAIL_HTML]))
+	{
+		$this->body[IT_MAIL_HTML] = '<!doctype html public "-//w3c//dtd html 4.01 transitional//en">' . "\n" . $this->body[IT_MAIL_HTML];
+	}
+
+
+	$headers[] = "MIME-Version: 1.0";
+
+	if ($this->attachments)
+	{
+		/* Attachments need multipart MIME mail */
+		$boundary1 = md5(uniqid(rand()));
+		$mixedtype = "Content-Type: multipart/mixed; boundary=\"$boundary1\"";
+
+		$headers[] = $mixedtype;
+		$text .= "This is a multi-part message in MIME format.";
+		$text .= "\n--$boundary1\n";
+	}
+
+	/* Headers for plain and HTML content */
+	$plaintype = "Content-Type: text/plain; charset=".$this->charset."\nContent-Transfer-Encoding: 8bit";
+	$htmltype = "Content-Type: text/html; charset=".$this->charset."\nContent-Transfer-Encoding: 8bit";
+
+	if ($this->body[IT_MAIL_PLAIN])
+	{
+		if ($this->body[IT_MAIL_HTML])
+		{
+			$boundary2 = md5(uniqid(rand()));
+			$alternativetype = "Content-Type: multipart/alternative; boundary=\"$boundary2\"";
+
+			/* Plain and HTML */
+			if ($this->attachments)
+				$text .= "$alternativetype\n\n";
+			else
+				$headers[] = $alternativetype;
+
+			$text .= "--$boundary2\n$plaintype\n\n";
+			$text .= $this->body[IT_MAIL_PLAIN];
+			$text .= "\n--$boundary2\n$htmltype\n\n";
+			$text .= $this->body[IT_MAIL_HTML];
+			$text .= "\n--$boundary2--\n";
+		}
+		else
+		{
+			/* Just plain */
+			if ($this->attachments)
+				$text .= "$plaintype\n\n";
+			else
+				$headers[] = $plaintype;
+
+			$text .= $this->body[IT_MAIL_PLAIN];
+		}
+	}
+	else if ($this->body[IT_MAIL_HTML])
+	{
+		/* Just HTML */
+		if ($this->attachments)
+		{
+			if (strstr($this->body[IT_MAIL_HTML], "cid:"))
+			{
+				$boundary3 = md5(uniqid(rand()));
+				$text .= "Content-Type: multipart/related; boundary=\"$boundary3\"\n\n--$boundary3\n";
+			}
+
+			$text .= "$htmltype\n\n";
+		}
+		else
+			$headers[] = $htmltype;
+
+		$text .= $this->body[IT_MAIL_HTML];
+	}
+
+	if ($this->attachments)
+	{
+		$text .= "\n";
+		$boundary = $boundary3 ? $boundary3 : $boundary1;
+
+		foreach ($this->attachments as $attachment)
+		{
+			$text .= "\n--$boundary\nContent-Type: {$attachment['mimetype']}; name=\"{$attachment['name']}\"\nContent-Transfer-Encoding: base64\nContent-ID: <{$attachment['cid']}>\nContent-Disposition: inline; filename=\"{$attachment['name']}\"\n\n";
+			$text .= chunk_split(base64_encode($attachment['data']));
+		}
+
+		if ($boundary3)
+			$text .= "\n--$boundary3--\n\n";
+
+		$text .= "--$boundary1--\n";
+	}
+
+	return mail($to, $this->subject, $text, join("\n", $headers), $this->flags);
+}
+
+
+/**
+ * INTERNAL: Escape header line with ?=iso-8859-1? if necessary, e.g. in Subject line
+ * @param $string String to be escaped
+ * @return String escape suitable for sending in header line
+ */
+function header_escape($string)
+{
+	return preg_replace('/[\x80-\xff]/e', "sprintf('=?iso-8859-1?Q?=%02X?=', ord('\\0'))", $string);
+}
+
+/**
+ * Make string safe to be used in "$fullname <$email>": Remove illegal
+ * characters and enclose in double quotes.
+ * @param $string Fulle name to be escaped
+ * @return String to be safely used in "$fullname <$email>" for To: etc.
+ */
+function fullname_escape($string)
+{
+	return '"' . preg_replace('/["\x00-\x1f]/', '', $string) . '"';
+}
+
+/**
+ * INTERNAL: Send SMTP command and return true if result is 2XX
+ * @param $fp Connection to SMTP server opened using fsockopen
+ * @param $command Command to send, e.g. HELO gna.ch
+ * @param $anwer String containing full answer from SMTP server
+ * @param timeoutok Whether a timeout is considered ok
+ * @param $failcode Lowest SMTP result code which is considered a failure (default 300)
+ * @return True if SMTP result code is lower than $failcode
+ *
+ */
+function send_smtp_cmd($fp, $cmd, &$answer, $timeoutok = false, $failcode = 300)
+{
+	$result = false;
+	$answer = '';
+
+	if (!$cmd || (!feof($fp) && fwrite($fp, "$cmd\r\n")))
+	{
+		while (!feof($fp) && ereg('^(...)(.?)(.*)$', fgets($fp, 1024), $regs))
+		{
+			$answer .= $regs[0];
+			$resultcode = intval($regs[1]);
+
+			if ($regs[2] != '-')	/* Multi line response? */
+			{
+				if (($resultcode >= 100) && ($resultcode < $failcode))
+					$result = true;
+
+				break;
+			}
+		}
+	}
+
+	/* A timeout can be considered ok for SLOW mail servers */
+	if ($answer == '')
+		$result = $timeoutok;
+
+	//echo ">>it_mail::send_smtp_cmd " . time() . " '$cmd' => $result: $answer";
+
+	return $result;
+}
+
+
+/**
+ * Check if given email address is valid (syntax, MX record). If you set
+ * checkmailbox to true it also connects to MX and asks if mailbox is valid.
+ * Note: Connecting to the MX can be slow.
+ * @param $email email to be check
+ * @param $checkmailbox True if you want to connect to MX and check account
+ * @return One of IT_MAIL_CHECKEMAIL_INVALID (0), IT_MAIL_CHECKEMAIL_MAILBOXFULL
+ * or IT_MAIL_CHECKEMAIL_OK (both != 0).
+ */
+function check_email($email, $checkmailbox = true)
+{
+	$result = IT_MAIL_CHECKEMAIL_INVALID;
+
+	/* Check if username starts with www. or not well-formed => reject */
+	if (!ereg('^www\.', $email) && eregi('^[a-z0-9&_+.-]+@([a-z0-9.-]+\.[a-z]+)$', $email, $regs))
+	{
+		$domain = $regs[1];
+
+		if (!getmxrr($domain, $mxhosts, $weights))
+		{
+			/* If we find no MX we check if domain exists */
+			if (gethostbynamel($domain))
+			{
+				$mxhosts = array($domain);
+				$weights = array(1);
+			}
+		}
+
+		if ($mxhosts)	/* We need at least one valid MX */
+		{
+			if ($checkmailbox)
+			{
+				$mx = array();
+
+				for ($i = 0; $i < count($mxhosts); $i++)
+					$mx[$mxhosts[$i]] = $weights[$i];
+
+				asort($mx, SORT_NUMERIC);
+				$port = getservbyname('smtp', 'tcp');
+				$from = 'itools@gna.ch';
+
+				/* Determine domain and email for test, skip if called as it_mail::check_email() */
+				if (is_object($this))
+				{
+					for ($i = 0; $i < count($this->header_names); $i++)
+					{
+						if ($this->header_names[$i] == 'From')
+						{
+							$from = $this->header_values[$i];
+							break;
+						}
+					}
+				}
+
+				if (eregi('@([a-z0-9.-]+\.[a-z]+)$', $from, $regs))
+					$fromdomain = $regs[1];
+				else
+					$fromdomain = 'gna.ch';
+
+				$finished = false;
+				$connected = 0;
+
+				if (function_exists('stream_set_timeout'))
+					$timeout = 'stream_set_timeout';
+				else
+					$timeout = 'socket_set_timeout';
+
+				foreach ($mx as $mxhost => $weight)
+				{
+					//echo ">>it_mail::check_email: " . time() . " checking $mxhost\n";
+					if ($fp = @fsockopen($mxhost, $port, $errno, $errstr, 5))
+					{
+						$connected++;
+						$timeout($fp, 45);
+						$answer = '';
+
+						if (it_mail::send_smtp_cmd($fp, '', $answer) && it_mail::send_smtp_cmd($fp, "HELO $fromdomain", $answer) && it_mail::send_smtp_cmd($fp, "MAIL FROM: <$from>", $answer))
+						{
+							$timeout($fp, 2);
+							$timeoutok = ($domain != 'bluewin.ch');
+
+							if (it_mail::send_smtp_cmd($fp, "RCPT TO: <$email>", $answer, $timeoutok, 500))	# 450 is often used for Greylisting
+								$result = IT_MAIL_CHECKEMAIL_OK;
+							else if (eregi('quota|full|exceeded storage', $answer))
+								$result = IT_MAIL_CHECKEMAIL_MAILBOXFULL;
+
+							/* Do not try other MX if we got this far */
+							$finished = true;
+						}
+
+						$timeout($fp, 0, 1);
+
+						it_mail::send_smtp_cmd($fp, 'RSET', $answer);
+
+						it_mail::send_smtp_cmd($fp, 'QUIT', $answer);
+						fclose($fp);
+					}
+
+					if ($finished)
+						break;
+				}
+
+				/* If we cannot connect to _any_ MX it could be because of temporary overload / virus attack */
+				if (!$connected)
+					$result = IT_MAIL_CHECKEMAIL_OK;
+			}
+			else
+				$result = IT_MAIL_CHECKEMAIL_OK;
+		}
+	}
+
+	return $result;
+}
+
+}
+
+?>