mail: new options to read attachments from file descriptors

* mail/mail.c (default_encoding,default_content_type)
(content_name,content_filename): New statics.
(cli_attach): Use the value of --content-name option as the
content-type name parameter.
The "-" argument instructs the program to read attachment from
stdin (eqv --attach-fd=0)
(cli_attach_fd): New function.
(mail_options): New options: --content-name, --content-filename,
--attach-fd
* mail/mail.h (send_attach_file_default): Remove.
(send_attach_file): New proto.
* mail/send.c (atchinfo): New fields: id, name, source.
(atchinfo_free): Update.
(default_encoding,default_content_type): Remove globals.
(send_attach_file): Rewrite.
(send_attach_file_default): Remove.
(escape_list_attachments): Print attachment identifier instead
of the file name, which can be NULL.
(saveatt): Use mu_attachment_create and mu_attachment_copy_from_stream.

* NEWS: Update.
* doc/texinfo/programs.texi: Document the new options.

-GNU mailutils NEWS -- history of user-visible changes. 2016-12-17
+GNU mailutils NEWS -- history of user-visible changes. 2017-01-13
 Copyright (C) 2002-2017 Free Software Foundation, Inc.
 Copyright (C) 2002-2017 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 See the end of file for copying conditions.
 
 
@@ -7,6 +7,54 @@ Please send mailutils bug reports to <bug-mailutils@gnu.org>.
 
 
 Version 3.1.90 (Git)
 Version 3.1.90 (Git)
 
 
+* mail
+
+** Modifying attachment name and filename
+
+Two new options are provided for modifying attachment name (a.k.a
+description), and file name:
+
+  --content-name=STRING
+     Sets the attachment name (description).  Technically speaking, it
+     is the "name" parameter in the Content-Type MIME header.
+     
+  --content-filename=NAME
+     Sets the file name (the "filename" parameter in the
+     Content-Description MIME header of the outgoing message.
+
+Both options affect only the next `--attach' or `--attach-fd' option.
+
+* Constructing attachments from command line
+
+The new option `--attach-fd=N' instructs mail to read attachment from
+file descriptor N.  By default, the attachments created using this
+option are unnamed, i.e. neither name parameter of the Content-Type
+header, nor the filename parameter of the Content-Disposition header
+are set.  Use the --content-name and --content-filename options to
+change these.
+
+The option `--attach-fd=0' causes attachment to be read from the
+standard input.  The option `--attach=-' has the same effect.  For
+obvious reasons, the interactive mode is suppressed in this case.
+
+The `--attach-fd' option is useful when calling `mail' from another
+program.
+
+Example:
+
+Suppose that the 'mail' binary is opened at file descriptor 5 and
+the mail.c file is opened at descriptor 6, the following command
+line sends them as attachments:
+
+  mail --encoding=base64 \
+       --content-type=application/octet-stream \
+       --content-name="the mail(1) binary" --content-filename="mail" \
+       --attach-fd=5 \
+       --encoding=binary\
+       --content-type=text/plain --content-name="mail.c source file"\
+       --content-filename=mail.c --attach-fd=6 \
+       root@example.org
+
 
 
 Version 3.1.1 - 2016-12-15
 Version 3.1.1 - 2016-12-15
 
 

@@ -2915,6 +2915,7 @@ Configuration Files}, for a detailed description of their format.
 * Invoking Mail::            Command Line Options.
 * Invoking Mail::            Command Line Options.
 * Specifying Messages::      How to Specify Message Sets.
 * Specifying Messages::      How to Specify Message Sets.
 * Composing Mail::           Composing Mail.
 * Composing Mail::           Composing Mail.
+* Attachments::              Attaching Files.
 * Reading Mail::             Reading Mail.
 * Reading Mail::             Reading Mail.
 * Scripting::                Scripting.
 * Scripting::                Scripting.
 * Mail Variables::           How to Alter the Behavior of @command{mail}.
 * Mail Variables::           How to Alter the Behavior of @command{mail}.
@@ -2938,9 +2939,22 @@ mail sending mode, otherwise it operates in mail reading mode.
 @table @option
 @table @option
 @item -A @var{file}
 @item -A @var{file}
 @itemx --attach=@var{file}
 @itemx --attach=@var{file}
-Attach @var{file} to the composed message.  The encoding and content
-type are controlled by the @option{--encoding} and
-@option{--content-type} options, correspondingly.
+Attach @var{file} to the composed message.  The encoding, content
+type, and content description are controlled by the
+@option{--encoding}, @option{--content-type}, and
+@option{--content-name} options, correspondingly.
+
+The option @option{--attach=-} instructs @command{mail} to read the
+file to be attached from the standard input.  Interactive shell is
+disabled in this case.
+
+@item --attach-fd=@var{fd}
+Read attachment body from the file descriptor @var{fd}.  The
+descriptor must be open for reading.  This option is useful when
+calling @command{mail} from another program.
+
+See the options @option{--encoding}, @option{--content-type}, 
+@option{--content-name}, and @option{--content-filename}.
 
 
 @item -a @var{header}:@var{value}
 @item -a @var{header}:@var{value}
 @itemx --append=@var{header}:@var{value}
 @itemx --append=@var{header}:@var{value}
@@ -2950,6 +2964,14 @@ Append the given header to the composed message.
 This options sets the content type to be used by all subsequent
 This options sets the content type to be used by all subsequent
 @option{--attach} options.
 @option{--attach} options.
 
 
+@item --content-filename=@var{name}
+Set the @samp{filename} parameter in the @samp{Content-Disposition}
+header for the next @option{--attach-fd} option.
+
+@item --content-name=@var{text}
+Set the @samp{name} parameter (description) in the @samp{Content-Type}
+header for the next @option{--attach} or @option{--attach-fd} option.
+
 @item -E @var{command}
 @item -E @var{command}
 @itemx --exec=@var{command}
 @itemx --exec=@var{command}
 Execute @var{command} before opening the mailbox.  Any number of
 Execute @var{command} before opening the mailbox.  Any number of
@@ -3412,6 +3434,115 @@ the old contents of your message.
 
 
 @c *********************************************************************
 @c *********************************************************************
 
 
+@node Attachments
+@subsection Sending Attachments
+
+The simplest way to attach a file from command line is by using the
+@option{--attach} (@option{-A}) option.  Its argument specifies the
+file to attach.  For example, the following will attach the content
+of the file @file{archive.tar}:
+
+@example
+$ mail --attach=archive.tar
+@end example
+
+By default, the content type will be set to
+@samp{application/octet-stream}, and the attachment will be encoded
+using the @samp{base64} encoding.  To change the content type, use the
+@option{--content-type} option.  For example, to send an HTML
+attachment:
+
+@example
+$ mail --content-type=text/html --attach=in.html
+@end example
+
+The @option{--content-type} option affects all @option{--attach}
+options that follow it.  To change the content type, simply add
+another @option{--content-type} option.  For example, to send both
+the HTML file and the archive:
+
+@example
+$ mail --content-type=text/html --attach=in.html \
+       --content-type=application/x-tar --attach=archive.tar
+@end example
+
+Similarly, the encoding to use is set up by the @option{--encoding}
+option.  As well as @option{--content-type}, this option affects all
+attachments supplied after it in the command line, until changed by
+the eventual next appearance of the same option.  Extending the above
+example:
+
+@example
+$ mail --content-type=text/html --encoding=quoted-printable \
+       --attach=in.html \
+       --content-type=application/x-tar --encoding=base64 \
+       --attach=archive.tar
+@end example
+
+Each attachment can also be assigned a @dfn{description} and a
+@dfn{file name}.  Normally, these are the same as the file name
+supplied with the @option{--attach} option.  However, you can change
+either or both of them using the @option{--content-name} and
+@option{--content-filename}, correspondingly.  Both of these options
+affect only the next @option{--attach} (or @option{--attach-fd}, see
+below) option.
+
+All the examples above will enter the usual interactive shell,
+allowing you to compose the body of the message.  If that's not
+needed, the non-interactive use can be forced by redirecting
+@file{/dev/null} to the standard input, e.g.:
+
+@example
+$ mail --attach=archive.tar < /dev/null
+@end example
+
+This will normally produce a message saying:
+
+@example
+mail: Null message body; hope that's ok
+@end example
+
+To suppress this message, unset the @samp{nullbodymsg} variable,
+as shown in the example below:
+
+@example
+$ mail -E 'set nonullbodymsg' --attach=archive.tar < /dev/null
+@end example
+
+The option @option{--attach=-} forces @command{mail} to read the file
+to be attached from the standard input stream.  This option implies
+disables the interactive mode and sets @samp{nonullbodymsg}
+implicitly, so that the above example can be rewritten as:
+
+@example
+$ mail --attach=- < archive.tar
+@end example
+
+Special option is provided to facilitate the use of @command{mail}
+in scripts.  The @option{--attach-fd=@var{N}} instructs the program to
+read the data to be attached from the file descriptor @var{N}.  The
+above example is equivalent to:
+
+@example
+$ mail --attach-fd=0 < archive.tar
+@end example
+
+Attachments created using this option have neither filename not
+description set, so normally the use of @option{--content-name} and/or
+@option{--content-filename} is advised.
+
+@example
+$ mail --subject 'mail(1)' \
+       --content-name="The mail(1) binary" --content-filename="mail" \
+       --attach-fd 5 \
+       --encoding=binary --content-type=text/plain \
+       --content-name="mail.c source file" --content-filename=mail.c \
+       --attach-fd 6 gray@@example.org 5</usr/bin/mail \
+       6<mailutils/mail/mail.c
+@end example
+
+@c *********************************************************************
+
 @node Reading Mail
 @node Reading Mail
 @subsection Reading Mail
 @subsection Reading Mail
 
 

@@ -36,6 +36,11 @@ int hint;
 char *file;
 char *file;
 char *user;
 char *user;
 
 
+char *default_encoding;
+char *default_content_type;
+char *content_name;
+char *content_filename;
+
 static void
 static void
 cli_f_option (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
 cli_f_option (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
 {
 {
@@ -134,9 +139,45 @@ cli_append (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
 static void
 static void
 cli_attach (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
 cli_attach (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
 {
 {
+  int fd = -1;
+  
+  hint |= HINT_SEND_MODE;
+  if (strcmp (arg, "-") == 0)
+    {
+      arg = NULL;
+      fd = 0;
+    }
+  if (send_attach_file (fd, arg, content_filename, content_name,
+			default_content_type, default_encoding))
+    exit (1);
+
+  free (content_name);
+  content_name = NULL;
+  free (content_filename);
+  content_filename = NULL;
+}
+
+static void
+cli_attach_fd (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
+{
+  int rc, fd;
+  
   hint |= HINT_SEND_MODE;
   hint |= HINT_SEND_MODE;
-  if (send_attach_file_default (arg))
+  rc = mu_str_to_c (arg, mu_c_int, &fd, NULL);
+  if (rc)
+    {
+      mu_parseopt_error (po, _("%s: bad descriptor"), arg);
+      exit (po->po_exit_error);
+    }
+  
+  if (send_attach_file (fd, NULL, content_filename, content_name,
+			default_content_type, default_encoding))
     exit (1);
     exit (1);
+
+  free (content_name);
+  content_name = NULL;
+  free (content_filename);
+  content_filename = NULL;
 }
 }
 
 
 static struct mu_option mail_options[] = {
 static struct mu_option mail_options[] = {
@@ -212,10 +253,21 @@ static struct mu_option mail_options[] = {
     N_("set content type for subsequent --attach options"),
     N_("set content type for subsequent --attach options"),
     mu_c_string, &default_content_type },
     mu_c_string, &default_content_type },
   
   
+  { "content-name", 0, N_("NAME"), MU_OPTION_DEFAULT,
+    N_("set the Content-Type name parameter for the next --attach option"),
+    mu_c_string, &content_name },
+  { "content-filename", 0, N_("NAME"), MU_OPTION_DEFAULT,
+    N_("set the Content-Disposition filename parameter for the next --attach option"),
+    mu_c_string, &content_filename },
+  
   { "attach",  'A', N_("FILE"), MU_OPTION_DEFAULT,
   { "attach",  'A', N_("FILE"), MU_OPTION_DEFAULT,
     N_("attach FILE"),
     N_("attach FILE"),
     mu_c_string, NULL, cli_attach },
     mu_c_string, NULL, cli_attach },
 
 
+  { "attach-fd",  0, N_("FD"), MU_OPTION_DEFAULT,
+    N_("attach from file descriptor FD"),
+    mu_c_string, NULL, cli_attach_fd },
+
   MU_OPTION_END
   MU_OPTION_END
 }, *options[] = { mail_options, NULL };
 }, *options[] = { mail_options, NULL };
 
 

@@ -258,7 +258,11 @@ extern char *mail_expand_name (const char *name);
 
 
 extern void send_append_header (char const *text);
 extern void send_append_header (char const *text);
 extern void send_append_header2 (char const *name, char const *value, int mode);
 extern void send_append_header2 (char const *name, char const *value, int mode);
-extern int send_attach_file_default (const char *name);
+extern int send_attach_file (int fd,
+			     const char *filename,
+			     const char *content_filename,
+			     const char *content_name,
+			     const char *content_type, const char *encoding);
 
 
 extern int escape_check_args (int argc, char **argv, int minargs, int maxargs);
 extern int escape_check_args (int argc, char **argv, int minargs, int maxargs);
 
 

@@ -134,54 +134,96 @@ mail_sendheader (int argc, char **argv)
 /* Attachments */
 /* Attachments */
 struct atchinfo
 struct atchinfo
 {
 {
+  char *id;
   char *encoding;
   char *encoding;
   char *content_type;
   char *content_type;
+  char *name;
   char *filename;
   char *filename;
+  mu_stream_t source;
 };
 };
 
 
 static mu_list_t attlist;
 static mu_list_t attlist;
 
 
-char *default_encoding;
-char *default_content_type;
-
 static void
 static void
 atchinfo_free (void *p)
 atchinfo_free (void *p)
 {
 {
   struct atchinfo *ap = p;
   struct atchinfo *ap = p;
+  free (ap->id);
   free (ap->encoding);
   free (ap->encoding);
   free (ap->content_type);
   free (ap->content_type);
+  free (ap->name);
   free (ap->filename);
   free (ap->filename);
+  mu_stream_destroy (&ap->source);
   free (ap);
   free (ap);
 }
 }
 
 
 int
 int
-send_attach_file (const char *name,
+send_attach_file (int fd,
+		  const char *realname,
+		  const char *content_filename, const char *content_name,
 		  const char *content_type, const char *encoding)
 		  const char *content_type, const char *encoding)
 {
 {
   int rc;
   int rc;
   struct stat st;
   struct stat st;
   struct atchinfo *aptr;
   struct atchinfo *aptr;
   mu_list_t list;
   mu_list_t list;
+  mu_stream_t stream = NULL;
+  char *id = NULL;
 
 
-  if (stat (name, &st))
+  if (fd >= 0)
+    {
+      rc = mu_fd_stream_create (&stream, NULL, fd, MU_STREAM_READ);
+      if (rc)
+	{
+	  mu_error (_("can't open descriptor %d: %s"), fd, mu_strerror (rc));
+	  return 1;
+	}
+      mu_asprintf (&id, "fd %d", fd);
+      if (fd == 0)
+	{
+	  mu_stream_destroy (&mu_strin);
+	  mu_nullstream_create (&mu_strin, MU_STREAM_READ);
+	  mu_stream_ioctl (mu_strin, MU_IOCTL_NULLSTREAM,
+			   MU_IOCTL_NULLSTREAM_SET_PATTERN, NULL);
+	  util_do_command ("set nullbody nullbodymsg");
+	}
+    }
+  else if (realname)
+    {
+      if (!content_filename)
+	content_filename = realname;
+      if (stat (realname, &st))
 	{
 	{
 	  if (errno == ENOENT)
 	  if (errno == ENOENT)
 	    {
 	    {
-	  mu_error (_("%s: file does not exist"), name);
+	      mu_error (_("%s: file does not exist"), realname);
 	      return 1;
 	      return 1;
 	    }
 	    }
 	  else
 	  else
 	    {
 	    {
-	  mu_error (_("%s: cannot stat: %s"), name, mu_strerror (errno));
+	      mu_error (_("%s: cannot stat: %s"), realname,
+			mu_strerror (errno));
 	      return 1;
 	      return 1;
 	    }
 	    }
 	}
 	}
       
       
       if (!S_ISREG (st.st_mode))
       if (!S_ISREG (st.st_mode))
 	{
 	{
-      mu_error (_("%s: not a regular file"), name);
+	  mu_error (_("%s: not a regular file"), realname);
+	  return 1;
+	}
+
+      rc = mu_mapfile_stream_create (&stream, realname, MU_STREAM_READ);
+      if (rc)
+	{
+	  mu_error (_("can't open file %s: %s"),
+		    realname, mu_strerror (rc));
 	  return 1;
 	  return 1;
 	}
 	}
+      mu_asprintf (&id, "\"%s\"", realname);
+    }
+  else
+    abort ();
   
   
   if (!encoding)
   if (!encoding)
     encoding = "base64";
     encoding = "base64";
@@ -190,6 +232,8 @@ send_attach_file (const char *name,
   if (rc)
   if (rc)
     {
     {
       mu_error (_("unsupported encoding: %s"), encoding);
       mu_error (_("unsupported encoding: %s"), encoding);
+      free (id);
+      mu_stream_destroy (&stream);
       return 1;
       return 1;
     }
     }
   
   
@@ -205,11 +249,13 @@ send_attach_file (const char *name,
     }
     }
   aptr = mu_alloc (sizeof (*aptr));
   aptr = mu_alloc (sizeof (*aptr));
 
 
+  aptr->id = id;
   aptr->encoding = mu_strdup (encoding);  
   aptr->encoding = mu_strdup (encoding);  
   aptr->content_type = mu_strdup (content_type ?
   aptr->content_type = mu_strdup (content_type ?
-				  content_type :
-				    "application/octet-stream");
-  aptr->filename = mu_strdup (name);
+				  content_type : "application/octet-stream");
+  aptr->name = content_name ? mu_strdup (content_name) : NULL;
+  aptr->filename = content_filename ? mu_strdup (content_filename) : NULL;
+  aptr->source = stream;
   rc = mu_list_append (attlist, aptr);
   rc = mu_list_append (attlist, aptr);
   if (rc)
   if (rc)
     {
     {
@@ -220,12 +266,6 @@ send_attach_file (const char *name,
 }
 }
 
 
 int
 int
-send_attach_file_default (const char *name)
-{
-  return send_attach_file (name, default_content_type, default_encoding);
-}
-
-int
 escape_list_attachments (int argc, char **argv, compose_env_t *env)
 escape_list_attachments (int argc, char **argv, compose_env_t *env)
 {
 {
   mu_iterator_t itr;
   mu_iterator_t itr;
@@ -246,7 +286,7 @@ escape_list_attachments (int argc, char **argv, compose_env_t *env)
 	continue;
 	continue;
 	  
 	  
       mu_printf ("%3d %-12s %-30s %-s\n",
       mu_printf ("%3d %-12s %-30s %-s\n",
-		 i, aptr->filename, aptr->content_type, aptr->encoding);
+		 i, aptr->id, aptr->content_type, aptr->encoding);
     }
     }
   mu_iterator_destroy (&itr);
   mu_iterator_destroy (&itr);
 
 
@@ -266,7 +306,8 @@ escape_attach (int argc, char **argv, compose_env_t *env)
     case 3:
     case 3:
       content_type = argv[2];
       content_type = argv[2];
     case 2:
     case 2:
-      return send_attach_file (argv[1], content_type, encoding);
+      return send_attach_file (-1, argv[1], argv[1], argv[1],
+			       content_type, encoding);
     default:
     default:
       return escape_check_args (argc, argv, 2, 4);
       return escape_check_args (argc, argv, 2, 4);
     }
     }
@@ -310,11 +351,19 @@ saveatt (void *item, void *data)
   size_t nparts;
   size_t nparts;
   char *p;
   char *p;
 
 
-  rc = mu_message_create_attachment (aptr->content_type, aptr->encoding,
-				     aptr->filename, &part);
+  rc = mu_attachment_create (&part, aptr->content_type, aptr->encoding,
+			     aptr->name, aptr->filename);
+  if (rc)
+    {
+      mu_error (_("can't create attachment %s: %s"),
+		aptr->id, mu_strerror (rc));
+      return 1;
+    }
+
+  rc = mu_attachment_copy_from_stream (part, aptr->source, aptr->encoding);
   if (rc)
   if (rc)
     {
     {
-      mu_error (_("cannot attach \"%s\": %s"), aptr->filename,
+      mu_error (_("cannot attach %s: %s"), aptr->filename,
 		mu_strerror (rc));
 		mu_strerror (rc));
       return 1;
       return 1;
     }
     }