Improve SMTP client.

* include/mailutils/smtp.h (mu_smtp_dot): New proto.
* libproto/mailer/smtp_dot.c: New file.
* libproto/mailer/Makefile.am (libmu_mailer_la_SOURCES): Add
smtp_dot.c.
* libproto/mailer/smtp.c (smtp_send_message): Send RSET after an
unexpected SMTP reply.
Call mu_smtp_dot after successful sending.
* libproto/mailer/smtp_data.c (_mu_smtp_data_end): Set
state to MU_SMTP_DOT.
* libproto/mailer/smtp_rset.c (mu_smtp_rset): Improve state
selection algorithm.
* libproto/mailer/smtp_send.c (mu_smtp_send_stream): Don't
reset state: it is done by _mu_smtp_data_end.
* testsuite/smtpsend.c (main): Call mu_smtp_dot after sending
message.

@@ -65,6 +65,7 @@ int mu_smtp_rcpt_basic (mu_smtp_t smtp, const char *email,
 
 int mu_smtp_data (mu_smtp_t smtp, mu_stream_t *pstream);
 int mu_smtp_send_stream (mu_smtp_t smtp, mu_stream_t str);
+int mu_smtp_dot (mu_smtp_t smtp);
 int mu_smtp_rset (mu_smtp_t smtp);
 int mu_smtp_quit (mu_smtp_t smtp);
 

@@ -36,6 +36,7 @@ libmu_mailer_la_SOURCES = \
  smtp_create.c\
  smtp_data.c\
  smtp_disconnect.c\
+ smtp_dot.c\
  smtp_ehlo.c\
  $(SMTP_GSASL)\
  smtp_io.c\

@@ -375,8 +375,8 @@ static int
 smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
 		   mu_address_t argfrom, mu_address_t argto)
 {
-  struct _smtp_mailer *smp = mailer->data;
-  mu_smtp_t smtp = smp->smtp;
+  struct _smtp_mailer *smp;
+  mu_smtp_t smtp;
   int status;
   size_t size, lines, count;
   const char *mail_from, *size_str;
@@ -388,7 +388,8 @@ smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
   smp = mailer->data;
   if (!smp)
     return EINVAL;
-
+  smtp = smp->smtp;
+  
   if ((status = mu_message_get_header (msg, &header)))
     return status;
   
@@ -400,7 +401,7 @@ smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
   if (status)
     return status;
   
-  if (mu_smtp_capa_test (smp->smtp, "SIZE", &size_str) == 0 &&
+  if (mu_smtp_capa_test (smtp, "SIZE", &size_str) == 0 &&
       mu_message_size (msg, &size) == 0 &&
       mu_message_lines (msg, &lines) == 0)
     {
@@ -409,21 +410,33 @@ smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
 
       if (msgsize && msgsize > maxsize)
 	return EFBIG;
-      status = mu_smtp_mail_basic (smp->smtp, mail_from,
+      status = mu_smtp_mail_basic (smtp, mail_from,
 				   "SIZE=%lu",
 				   (unsigned long) msgsize);
     }
   else
-    status = mu_smtp_mail_basic (smp->smtp, mail_from, NULL);
+    status = mu_smtp_mail_basic (smtp, mail_from, NULL);
   if (status)
-    return status;
+    {
+      if (status == MU_ERR_REPLY)
+	mu_smtp_rset (smtp);
+      return status;
+    }
 
   status = _rcpt_to_addr (smtp, smp->rcpt_to, &count);
   if (status && count == 0)
-    return status;
+    {
+      if (status == MU_ERR_REPLY)
+	mu_smtp_rset (smtp);
+      return status;
+    }
   status = _rcpt_to_addr (smtp, smp->rcpt_bcc, &count);
   if (status && count == 0)
-    return status;
+    {
+      if (status == MU_ERR_REPLY)
+	mu_smtp_rset (smtp);
+      return status;
+    }
 
   if (mu_header_sget_value (header, MU_HEADER_BCC, NULL))
     {
@@ -433,7 +446,11 @@ smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
 
       status = mu_smtp_data (smtp, &ostr);
       if (status)
-	return status;
+	{
+	  if (status == MU_ERR_REPLY)
+	    mu_smtp_rset (smtp);
+	  return status;
+	}
       mu_header_get_iterator (header, &itr);
       for (mu_iterator_first (itr); !mu_iterator_is_done (itr);
 	   mu_iterator_next (itr))
@@ -451,7 +468,7 @@ smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
       
       mu_message_get_body (msg, &body);
       mu_body_get_streamref (body, &bstr);
-      mu_stream_copy (ostr, bstr, 0, NULL);
+      status = mu_stream_copy (ostr, bstr, 0, NULL);
       mu_stream_destroy (&bstr);
       mu_stream_close (ostr);
       mu_stream_destroy (&ostr);
@@ -463,13 +480,17 @@ smtp_send_message (mu_mailer_t mailer, mu_message_t msg,
       status = mu_smtp_send_stream (smtp, str);
       mu_stream_destroy (&str);
     }
-  mu_smtp_quit (smtp);
   mu_address_destroy (&smp->rcpt_to);
   mu_address_destroy (&smp->rcpt_bcc);
+  if (status == 0)
+    {
+      status = mu_smtp_dot (smtp);
+      if (status == MU_ERR_REPLY)
+	mu_smtp_rset (smtp);
+    }
   return status;
 }
 
-
 static int
 _mailer_smtp_init (mu_mailer_t mailer)
 {

@@ -76,6 +76,7 @@ _mu_smtp_data_end (mu_smtp_t smtp)
 			mu_strerror (status));
     }
   _mu_smtp_xscript_level (smtp, MU_XSCRIPT_NORMAL);
+  smtp->state = MU_SMTP_DOT;
   return status;
 }
 

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <mailutils/errno.h>
+#include <mailutils/cctype.h>
+#include <mailutils/list.h>
+#include <mailutils/util.h>
+#include <mailutils/smtp.h>
+#include <mailutils/sys/smtp.h>
+
+int
+mu_smtp_dot (mu_smtp_t smtp)
+{
+  int status;
+  
+  if (!smtp)
+    return EINVAL;
+  if (MU_SMTP_FISSET (smtp, _MU_SMTP_ERR))
+    return MU_ERR_FAILURE;
+  if (smtp->state != MU_SMTP_DOT)
+    return MU_ERR_SEQ;
+  status = mu_smtp_response (smtp);
+  MU_SMTP_CHECK_ERROR (smtp, status);
+  if (smtp->replcode[0] != '2')
+    return MU_ERR_REPLY;
+  smtp->state = MU_SMTP_MAIL; /* FIXME: Force _EHLO perhaps? */
+  return 0;
+}

@@ -43,6 +43,21 @@ mu_smtp_rset (mu_smtp_t smtp)
   MU_SMTP_CHECK_ERROR (smtp, status);
   if (smtp->replcode[0] != '2')
     return MU_ERR_REPLY;
-  smtp->state = MU_SMTP_EHLO;
+  
+  switch (smtp->state)
+    {
+    case MU_SMTP_INIT:
+    case MU_SMTP_EHLO:
+    case MU_SMTP_DOT:
+      /* RFC 2821, 4.1.1.5 RESET (RSET):
+	[RSET] is effectively equivalent to a NOOP (i.e., if has no effect)
+	if issued immediately after EHLO, before EHLO is issued in the
+	session, after an end-of-data indicator has been sent and
+	acknowledged, or immediately before a QUIT */
+      break;
+      
+    default:
+      smtp->state = MU_SMTP_MAIL;
+    }
   return 0;
 }

@@ -62,7 +62,5 @@ mu_smtp_send_stream (mu_smtp_t smtp, mu_stream_t stream)
   
   status = _smtp_data_send (smtp, input);
   mu_stream_destroy (&input);
-  if (status == 0)
-    smtp->state = MU_SMTP_DOT;
   return status;
 }

@@ -289,7 +289,7 @@ main (int argc, char **argv)
       mu_stream_close (ostr);
       mu_stream_destroy (&ostr);
     }
-  
+  MU_ASSERT (mu_smtp_dot (smtp));
   MU_ASSERT (mu_smtp_quit (smtp));
   
   mu_smtp_destroy (&smtp);