[stable15] Add pipe mode for sendmail

config/config.sample.php

@@ -421,6 +421,19 @@
  */
 'mail_send_plaintext_only' => false,
 
+/**
+ * Which mode is used for sendmail/qmail: ``smtp`` or ``pipe``.
+ *
+ * For ``smtp`` the sendmail binary is started with the parameter ``-bs``:
+ *   - Use the SMTP protocol on standard input and output.
+ *
+ * For ``pipe`` the binary is started with the parameters ``-t``:
+ *   - Read message from STDIN and extract recipients.
+ *
+ * Defaults to ``smtp``
+ */
+'mail_sendmailmode' => 'smtp',
+
 /**
  * Proxy Configurations
  */

lib/private/Mail/Mailer.php

@@ -282,6 +282,15 @@ protected function getSendMailInstance(): \Swift_SendmailTransport {
 				break;
 		}
 
-		return new \Swift_SendmailTransport($binaryPath . ' -bs');
+		switch ($this->config->getSystemValue('mail_sendmailmode', 'smtp')) {
+			case 'pipe':
+				$binaryParam = ' -t';
+				break;
+			default:
+				$binaryParam = ' -bs';
+				break;
+		}
+
+		return new \Swift_SendmailTransport($binaryPath . $binaryParam);
 	}
 }

lib/private/Settings/Admin/Mail.php

@@ -57,6 +57,7 @@ public function getForm() {
 			'mail_smtpauth'         => $this->config->getSystemValue('mail_smtpauth', false),
 			'mail_smtpname'         => $this->config->getSystemValue('mail_smtpname', ''),
 			'mail_smtppassword'     => $this->config->getSystemValue('mail_smtppassword', ''),
+			'mail_sendmailmode'     => $this->config->getSystemValue('mail_sendmailmode', 'smtp'),
 		];
 
 		if ($parameters['mail_smtppassword'] !== '') {

settings/Controller/MailSettingsController.php

@@ -91,7 +91,8 @@ public function setMailSettings($mail_domain,
 									$mail_smtphost,
 									$mail_smtpauthtype,
 									$mail_smtpauth,
-									$mail_smtpport) {
+									$mail_smtpport,
+									$mail_sendmailmode) {
 
 		$params = get_defined_vars();
 		$configs = [];

settings/js/admin.js

@@ -158,6 +158,7 @@ $(document).ready(function(){
 			$('#mail_smtpsecure_label').addClass('hidden');
 			$('#mail_smtpsecure').addClass('hidden');
 			$('#mail_credentials').addClass('hidden');
+			$('#mail_sendmailmode_label, #mail_sendmailmode').removeClass('hidden');
 		} else {
 			$('#setting_smtpauth').removeClass('hidden');
 			$('#setting_smtphost').removeClass('hidden');
@@ -166,6 +167,7 @@ $(document).ready(function(){
 			if ($('#mail_smtpauth').is(':checked')) {
 				$('#mail_credentials').removeClass('hidden');
 			}
+			$('#mail_sendmailmode_label, #mail_sendmailmode').addClass('hidden');
 		}
 	});
 

settings/templates/settings/admin/additional-mail.php

@@ -47,6 +47,11 @@
 	$mail_smtpmode[] = ['qmail', 'qmail'];
 }
 
+$mail_sendmailmode = [
+	'smtp' => 'smtp (-bs)',
+	'pipe' => 'pipe (-t)'
+];
+
 ?>
 
 <div class="section" id="mail_general_settings">
@@ -84,6 +89,15 @@
 					<option value="<?php p($secure)?>" <?php p($selected) ?>><?php p($name) ?></option>
 				<?php endforeach;?>
 			</select>
+
+			<label id="mail_sendmailmode_label" for="mail_sendmailmode" class="<?= $_['mail_smtpmode'] !== 'sendmail' ? 'hidden' : '' ?>">
+				<?php p($l->t('Sendmail mode')); ?>
+			</label>
+			<select name="mail_sendmailmode" id="mail_sendmailmode" class="<?= $_['mail_smtpmode'] !== 'sendmail' ? 'hidden' : '' ?>">
+				<?php foreach ($mail_sendmailmode as $sendmailmodeValue => $sendmailmodeLabel): ?>
+					<option value="<?php p($sendmailmodeValue)?>" <?= $sendmailmodeValue === $_['mail_sendmailmode'] ? 'selected="selected"' : '' ?>><?php p($sendmailmodeLabel) ?></option>
+				<?php endforeach;?>
+			</select>
 		</p>
 
 		<p>

tests/Settings/Controller/MailSettingsControllerTest.php

@@ -74,6 +74,7 @@ public function testSetMailSettings() {
 					'mail_smtpauthtype' => 'NTLM',
 					'mail_smtpauth' => 1,
 					'mail_smtpport' => '25',
+					'mail_sendmailmode' => null,
 				]],
 				[[
 					'mail_domain' => 'nextcloud.com',
@@ -86,6 +87,7 @@ public function testSetMailSettings() {
 					'mail_smtpport' => '25',
 					'mail_smtpname' => null,
 					'mail_smtppassword' => null,
+					'mail_sendmailmode' => null,
 				]]
 			);
 
@@ -98,7 +100,8 @@ public function testSetMailSettings() {
 			'mx.nextcloud.org',
 			'NTLM',
 			1,
-			'25'
+			'25',
+			null
 		);
 		$this->assertSame(Http::STATUS_OK, $response->getStatus());
 
@@ -111,7 +114,8 @@ public function testSetMailSettings() {
 			'mx.nextcloud.org',
 			'NTLM',
 			0,
-			'25'
+			'25',
+			null
 		);
 		$this->assertSame(Http::STATUS_OK, $response->getStatus());
 

tests/lib/Mail/MailerTest.php

@@ -48,30 +48,54 @@ public function setUp() {
 		);
 	}
 
-	public function testGetSendMailInstanceSendMail() {
+	/**
+	 * @return array
+	 */
+	public function sendmailModeProvider(): array {
+		return [
+			'smtp' => ['smtp', ' -bs'],
+			'pipe' => ['pipe', ' -t'],
+		];
+	}
+
+	/**
+	 * @dataProvider sendmailModeProvider
+	 * @param $sendmailMode
+	 * @param $binaryParam
+	 */
+	public function testGetSendmailInstanceSendMail($sendmailMode, $binaryParam) {
 		$this->config
-			->expects($this->once())
+			->expects($this->exactly(2))
 			->method('getSystemValue')
-			->with('mail_smtpmode', 'smtp')
-			->will($this->returnValue('sendmail'));
+			->will($this->returnValueMap([
+				['mail_smtpmode', 'smtp', 'sendmail'],
+				['mail_sendmailmode', 'smtp', $sendmailMode],
+			]));
 
 		$path = \OC_Helper::findBinaryPath('sendmail');
 		if ($path === null) {
 			$path = '/usr/sbin/sendmail';
 		}
 
-		$expected = new \Swift_SendmailTransport($path . ' -bs');
+		$expected = new \Swift_SendmailTransport($path . $binaryParam);
 		$this->assertEquals($expected, self::invokePrivate($this->mailer, 'getSendMailInstance'));
 	}
 
-	public function testGetSendMailInstanceSendMailQmail() {
+	/**
+	 * @dataProvider sendmailModeProvider
+	 * @param $sendmailMode
+	 * @param $binaryParam
+	 */
+	public function testGetSendmailInstanceSendMailQmail($sendmailMode, $binaryParam) {
 		$this->config
-			->expects($this->once())
+			->expects($this->exactly(2))
 			->method('getSystemValue')
-			->with('mail_smtpmode', 'smtp')
-			->will($this->returnValue('qmail'));
+			->will($this->returnValueMap([
+				['mail_smtpmode', 'smtp', 'qmail'],
+				['mail_sendmailmode', 'smtp', $sendmailMode],
+			]));
 
-		$this->assertEquals(new \Swift_SendmailTransport('/var/qmail/bin/sendmail -bs'), self::invokePrivate($this->mailer, 'getSendMailInstance'));
+		$this->assertEquals(new \Swift_SendmailTransport('/var/qmail/bin/sendmail' . $binaryParam), self::invokePrivate($this->mailer, 'getSendMailInstance'));
 	}
 
 	public function testGetInstanceDefault() {
@@ -83,8 +107,10 @@ public function testGetInstanceDefault() {
 	public function testGetInstanceSendmail() {
 		$this->config
 			->method('getSystemValue')
-			->with('mail_smtpmode', 'smtp')
-			->willReturn('sendmail');
+			->will($this->returnValueMap([
+				['mail_smtpmode', 'smtp', 'sendmail'],
+				['mail_sendmailmode', 'smtp', 'smtp'],
+			]));
 
 		$mailer = self::invokePrivate($this->mailer, 'getInstance');
 		$this->assertInstanceOf(\Swift_Mailer::class, $mailer);

tests/lib/Settings/Admin/MailTest.php

@@ -95,6 +95,11 @@ public function testGetForm() {
 			->method('getSystemValue')
 			->with('mail_smtppassword', '')
 			->willReturn('mypassword');
+		$this->config
+			->expects($this->at(10))
+			->method('getSystemValue')
+			->with('mail_sendmailmode', 'smtp')
+			->willReturn('smtp');
 
 		$expected = new TemplateResponse(
 			'settings',
@@ -111,6 +116,7 @@ public function testGetForm() {
 				'mail_smtpauth'         => true,
 				'mail_smtpname'         => 'smtp.sender.com',
 				'mail_smtppassword'     => '********',
+				'mail_sendmailmode'		=> 'smtp',
 			],
 			''
 		);