From 207f1d7aa75ebf4cd695fc1bc735dc98c49cc5f5 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Sun, 7 Feb 1999 21:06:13 +0000
Subject: Added bouncemail option.

svn path=/trunk/; revision=2382
---
 NEWS              |  3 +++
 conf.c            |  1 +
 design-notes.html | 17 +++++++-------
 fetchmail.c       |  9 +++++++
 fetchmail.h       |  1 +
 fetchmail.man     | 17 ++++++++++----
 fetchmailconf     | 18 ++++++++++++++
 options.c         | 70 ++++++++++++++++++++++++++++++-------------------------
 rcfile_l.l        |  1 +
 rcfile_y.y        |  6 +++--
 sink.c            | 44 +++++++++++++++++++---------------
 11 files changed, 122 insertions(+), 65 deletions(-)

diff --git a/NEWS b/NEWS
index 9db1077d..8d800777 100644
--- a/NEWS
+++ b/NEWS
@@ -10,6 +10,9 @@ fetchmail-4.7.8 ():
 * FreeBSD support for interface and monitor options by Andy Doran <ad@psn.ie>.
 * Fixed server-deletion bug in fetchmailconf.
 * Timestamps now generated into logfiles at start of poll cycle.
+* New `nobounce' debugging option (specifically exempted from feature freeze)
+  allows SMTP error bouncemail to be redirected from sender to local
+  postmaster.
 
 There are 257 people on fetchmail-friends and 348 on fetchmail-announce.
 
diff --git a/conf.c b/conf.c
index e7f9f9c9..24f71a37 100644
--- a/conf.c
+++ b/conf.c
@@ -188,6 +188,7 @@ void dump_config(struct runctl *runp, struct query *querylist)
     stringdump("logfile", runp->logfile);
     stringdump("idfile", runp->idfile);
     stringdump("postmaster", runp->postmaster);
+    booldump("bouncemail", runp->bouncemail);
     stringdump("properties", runp->properties);
     booldump("invisible", runp->invisible);
     booldump("syslog", runp->use_syslog);
diff --git a/design-notes.html b/design-notes.html
index 8a48ba6f..fcc446bf 100644
--- a/design-notes.html
+++ b/design-notes.html
@@ -10,7 +10,7 @@
 <table width="100%" cellpadding=0><tr>
 <td width="30%">Back to <a href="/~esr/index.html">Fetchmail Home Page</a>
 <td width="30%" align=center>To <a href="/~esr/sitemap.html">Site Map</a>
-<td width="30%" align=right>$Date: 1999/01/01 18:49:07 $
+<td width="30%" align=right>$Date: 1999/02/07 21:06:09 $
 </table>
 <HR>
 <H1 ALIGN=CENTER>Design Notes On Fetchmail</H1>
@@ -318,15 +318,15 @@ a lot of fiddly details in the process.  You'll need to do the
 following minimum steps.
 
 <UL>
-<LI>Add a field to represent the control in <code>struct query</code> or
-    <code>struct hostdata</code>.
-
-<LI>Pick a token to declare the option in the .fetchmailrc file.  Add
-    the token to <code>rcfile_l</code>.  
+<LI>Add a field to represent the control in <code>struct run</code>,
+    <code>struct query</code>, or <code>struct hostdata</code>.
 
 <LI>Go to <code>rcfile_y.y</code>.  Add the token to the grammar. Don't
     forget the <code>%token</code> declaration.  
 
+<LI>Pick an actual string to declare the option in the .fetchmailrc file.  Add
+    the token to <code>rcfile_l</code>.  
+
 <LI>Pick a long-form option name, and a one-letter short option if any
     are left.  Go to <code>options.c</code>.  Pick a new <code>LA_</code>
     value.  Hack the <code>longoptions</code> table to set up the
@@ -339,7 +339,8 @@ following minimum steps.
 <LI>Add code to dump the option value in <code>fetchmail.c:dump_params</code>.
 
 <LI>Add proper <code>FLAG_MERGE</code> actions in fetchmail.c's
-    optmerge() function.
+    optmerge() function.  (If it's a global option, add an override 
+    at the end of load_params.
 
 <LI>Document the option in fetchmail.man.  This will require at least
     two changes; one to the collected table of options, and one full
@@ -530,7 +531,7 @@ all shaped the design in one way or another.<P>
 <table width="100%" cellpadding=0><tr>
 <td width="30%">Back to <a href="index.html">Fetchmail Home Page</a>
 <td width="30%" align=center>To <a href="/~esr/sitemap.html">Site Map</a>
-<td width="30%" align=right>$Date: 1999/01/01 18:49:07 $
+<td width="30%" align=right>$Date: 1999/02/07 21:06:09 $
 </table>
 
 <P><ADDRESS>Eric S. Raymond <A HREF="mailto:esr@thyrsus.com">&lt;esr@snark.thyrsus.com&gt;</A></ADDRESS>
diff --git a/fetchmail.c b/fetchmail.c
index 03af1481..cfbbb863 100644
--- a/fetchmail.c
+++ b/fetchmail.c
@@ -874,6 +874,8 @@ static int load_params(int argc, char **argv, int optind)
     struct passwd *pw;
     struct query def_opts, *ctl;
 
+    run.bouncemail = TRUE;
+
     memset(&def_opts, '\0', sizeof(struct query));
     def_opts.smtp_socket = -1;
     def_opts.smtpaddress = (char *)0;
@@ -1161,6 +1163,8 @@ static int load_params(int argc, char **argv, int optind)
 	run.use_syslog = (cmd_run.use_syslog == FLAG_TRUE);
     if (cmd_run.postmaster)
 	run.postmaster = cmd_run.postmaster;
+    if (cmd_run.bouncemail)
+	run.bouncemail = cmd_run.bouncemail;
 
     /* check and daemon options are not compatible */
     if (check_only && run.poll_interval)
@@ -1351,6 +1355,11 @@ static void dump_params (struct runctl *runp,
 	printf(_("Fetchmail will forward misaddressed multidrop messages to %s.\n"),
 	       runp->postmaster);
 
+    if (!runp->bouncemail)
+	printf(_("Fetchmail will direct error mail to the postmaster.\n"));
+    else if (outlevel >= O_VERBOSE)
+	printf(_("Fetchmail will direct error mail to the sender.\n"));
+
     for (ctl = querylist; ctl; ctl = ctl->next)
     {
 	if (!ctl->active || (implicit && ctl->server.skip))
diff --git a/fetchmail.h b/fetchmail.h
index e0e53933..3549130a 100644
--- a/fetchmail.h
+++ b/fetchmail.h
@@ -104,6 +104,7 @@ struct runctl
     char	*idfile;
     int		poll_interval;
     char	*postmaster;
+    flag	bouncemail;
     char	*properties;
     flag	use_syslog;
     flag	invisible;
diff --git a/fetchmail.man b/fetchmail.man
index 0cb7f688..8005cc6e 100644
--- a/fetchmail.man
+++ b/fetchmail.man
@@ -765,6 +765,12 @@ can be found.  Normally this is just the user who invoked fetchmail.
 If the invoking user is root, then the default of this option is
 the user `postmaster'.
 .PP
+The
+.B --nobounce
+option suppresses the normal action of bouncing errors back to the 
+sender in an RFC1894-conformant error message.  If nobounce is on, the
+message will go to the postmaster instead.
+.PP
 The 
 .B --invisible
 option (keyword: set invisible) tries to make fetchmail invisible.
@@ -956,6 +962,9 @@ T}
 set postmaster  	\&	T{
 Give the name of the last-resort mail recipient
 T}
+set nobouncemail	\&	T{
+Direct error mail to postmaster rather than sender
+T}
 set logfile  	\&	T{
 Name of a file to dump error and status messages to
 T}
@@ -1216,10 +1225,10 @@ of `dns', `checkalias', `localdomains', and `aka' for details on how
 matching addresses are handled.
 .PP
 If \fIfetchmail\fR cannot match any mailserver usernames or
-localdomain addresses, the default recipient is the value of the
-`postmaster' global option if that has been set; otherwise it's the
-calling user (as set by the USER or LOGNAME variable in the
-environment).
+localdomain addresses, the mail will be bounced.
+Normally it will be bounced to the sender, but if `nobounce' is on
+it will go to the postmaster (which in turn defaults to being the
+calling user).
 .PP
 The `dns' option (normally on) controls the way addresses from
 multidrop mailboxes are checked.  On, it enables logic to check each
diff --git a/fetchmailconf b/fetchmailconf
index 75e0de01..9537cb14 100755
--- a/fetchmailconf
+++ b/fetchmailconf
@@ -19,6 +19,7 @@ class Configuration:
 	self.logfile = None		# No logfile, initially
 	self.idfile = os.environ["HOME"] + "/.fetchids"		# Default idfile, initially
         self.postmaster = None		# No last-resort address, initially
+        self.bouncemail = TRUE		# Vounce errors to users
         self.properties = None		# No exiguous properties
 	self.invisible = FALSE		# Suppress Received line & spoof?
 	self.syslog = FALSE		# Use syslogd for logging?
@@ -28,6 +29,7 @@ class Configuration:
 	    ('logfile',		'String'),
 	    ('idfile',		'String'),
 	    ('postmaster',	'String'),
+	    ('bouncemail',	'Boolean'),
 	    ('properties',	'String'),
 	    ('syslog',		'Boolean'),
 	    ('invisible',	'Boolean'))
@@ -42,6 +44,10 @@ class Configuration:
 	    str = str + ("set idfile \"%s\"\n" % (self.idfile,));
 	if self.postmaster != ConfigurationDefaults.postmaster:
 	    str = str + ("set postmaster \"%s\"\n" % (self.postmaster,));
+        if self.bouncemail:
+            str = str + ("set bouncemail\n")
+        else:
+            str = str + ("set nobouncemail\n")
 	if self.properties != ConfigurationDefaults.properties:
 	    str = str + ("set properties \"%s\"\n" % (self.properties,));
 	if self.poll_interval > 0:
@@ -591,6 +597,10 @@ Postmaster
         invoking user as the address of last resort unless that user is
         root.  If that user is root, fetchmail sends to `postmaster'.
 
+Bounces to sender?
+	If this option is on (the default) error mail goes to the sender.
+        Otherwise it goes to the postmaster.
+
 Invisible
         If false (the default) fetchmail generates a Received line into
         each message and generates a HELO from the machine it is running on.
@@ -658,6 +668,7 @@ class ConfigurationEdit(Frame, MyWidget):
             # Set the postmaster
             log = LabeledEntry(ff, '     Postmaster:', self.postmaster, '14')
             log.pack(side=RIGHT, anchor=E)
+
         # Set the poll interval
         de = LabeledEntry(ff, '     Poll interval:', self.poll_interval, '14')
         de.pack(side=RIGHT, anchor=E)
@@ -666,6 +677,13 @@ class ConfigurationEdit(Frame, MyWidget):
         df.pack()
 
         if self.mode != 'novice':
+            pf = Frame(gf)
+            Checkbutton(pf,
+		{'text':'Bounces to sender?',
+		'variable':self.bouncemail,
+		'relief':GROOVE}).pack(side=LEFT, anchor=W)
+            pf.pack(fill=X)
+
             sf = Frame(gf)
             Checkbutton(sf,
 		{'text':'Log to syslog?',
diff --git a/options.c b/options.c
index 0832b892..9d8cc486 100644
--- a/options.c
+++ b/options.c
@@ -37,38 +37,39 @@
 #define LA_RCFILE	13
 #define LA_IDFILE	14
 #define LA_POSTMASTER	15
-#define LA_PROTOCOL	16
-#define LA_UIDL		17
-#define LA_PORT		18
-#define LA_AUTHENTICATE	19
-#define LA_TIMEOUT	20
-#define LA_ENVELOPE	21
-#define LA_QVIRTUAL     22
-#define LA_USERNAME	23
-#define LA_ALL          24
-#define LA_NOKEEP	25
-#define	LA_KEEP		26
-#define LA_FLUSH        27
-#define LA_NOREWRITE	28
-#define LA_LIMIT	29
-#define LA_WARNINGS	30
-#define LA_FOLDER	31
-#define LA_SMTPHOST	32
-#define LA_SMTPADDR     33
-#define LA_ANTISPAM	34
-#define LA_BATCHLIMIT	35
-#define LA_FETCHLIMIT	36
-#define LA_EXPUNGE	37
-#define LA_MDA		38
-#define LA_BSMTP	39
-#define LA_LMTP		40
-#define LA_PLUGIN	41
-#define LA_PLUGOUT	42
-#define LA_NETSEC	43
-#define LA_INTERFACE    44
-#define LA_MONITOR      45
-#define LA_CONFIGDUMP	46
-#define LA_YYDEBUG	47
+#define LA_NOBOUNCE	16
+#define LA_PROTOCOL	17
+#define LA_UIDL		18
+#define LA_PORT		19
+#define LA_AUTHENTICATE	20
+#define LA_TIMEOUT	21
+#define LA_ENVELOPE	22
+#define LA_QVIRTUAL     23
+#define LA_USERNAME	24
+#define LA_ALL          25
+#define LA_NOKEEP	26
+#define	LA_KEEP		27
+#define LA_FLUSH        28
+#define LA_NOREWRITE	29
+#define LA_LIMIT	30
+#define LA_WARNINGS	31
+#define LA_FOLDER	32
+#define LA_SMTPHOST	33
+#define LA_SMTPADDR     34
+#define LA_ANTISPAM	35
+#define LA_BATCHLIMIT	36
+#define LA_FETCHLIMIT	37
+#define LA_EXPUNGE	38
+#define LA_MDA		39
+#define LA_BSMTP	40
+#define LA_LMTP		41
+#define LA_PLUGIN	42
+#define LA_PLUGOUT	43
+#define LA_NETSEC	44
+#define LA_INTERFACE    45
+#define LA_MONITOR      46
+#define LA_CONFIGDUMP	47
+#define LA_YYDEBUG	48
 
 /* options still left: CDgGhHjJoORwWxXYz */
 static const char *shortoptions = 
@@ -91,6 +92,7 @@ static const struct option longoptions[] = {
   {"fetchmailrc",required_argument,(int *) 0, LA_RCFILE      },
   {"idfile",	required_argument, (int *) 0, LA_IDFILE      },
   {"postmaster",required_argument, (int *) 0, LA_POSTMASTER  },
+  {"nobounce",  no_argument,       (int *) 0, LA_NOBOUNCE    },
 
   {"protocol",	required_argument, (int *) 0, LA_PROTOCOL    },
   {"proto",	required_argument, (int *) 0, LA_PROTOCOL    },
@@ -297,6 +299,9 @@ struct query *ctl;	/* option record to be initialized */
 	    rctl->postmaster = (char *) xmalloc(strlen(optarg)+1);
 	    strcpy(rctl->postmaster,optarg);
 	    break;
+	case LA_NOBOUNCE:
+	    run.bouncemail = FALSE;
+	    break;
 	case 'p':
 	case LA_PROTOCOL:
 	    /* XXX -- should probably use a table lookup here */
@@ -565,6 +570,7 @@ struct query *ctl;	/* option record to be initialized */
 	P(_("  -f, --fetchmailrc specify alternate run control file\n"));
 	P(_("  -i, --idfile      specify alternate UIDs file\n"));
 	P(_("      --postmaster  specify recipient of last resort\n"));
+	P(_("      --nobounce    redirect bounces from user to postmaster."));
 #if (defined(linux) && !INET6) || defined(__FreeBSD__)
 	P(_("  -I, --interface   interface required specification\n"));
 	P(_("  -M, --monitor     monitor interface for activity\n"));
diff --git a/rcfile_l.l b/rcfile_l.l
index d86f790b..92466316 100644
--- a/rcfile_l.l
+++ b/rcfile_l.l
@@ -28,6 +28,7 @@ daemon		{ return DAEMON; }
 syslog		{ return SYSLOG; }
 invisible	{ return INVISIBLE; }
 postmaster	{ return POSTMASTER; }
+bouncemail	{ return BOUNCEMAIL; }
 warnings	{ return WARNINGS; }
 
 defaults 	{ return DEFAULTS; }
diff --git a/rcfile_y.y b/rcfile_y.y
index 19e788d5..7935ba17 100644
--- a/rcfile_y.y
+++ b/rcfile_y.y
@@ -60,11 +60,11 @@ extern char * yytext;
 %token DEFAULTS POLL SKIP VIA AKA LOCALDOMAINS PROTOCOL
 %token AUTHENTICATE TIMEOUT KPOP SDPS KERBEROS4 KERBEROS5 KERBEROS
 %token ENVELOPE QVIRTUAL USERNAME PASSWORD FOLDER SMTPHOST MDA BSMTP LMTP
-%token SMTPADDRESS SPAMRESPONSE PRECONNECT POSTCONNECT LIMIT
+%token SMTPADDRESS SPAMRESPONSE PRECONNECT POSTCONNECT LIMIT WARNINGS
 %token NETSEC INTERFACE MONITOR PLUGIN PLUGOUT
 %token IS HERE THERE TO MAP WILDCARD
 %token BATCHLIMIT FETCHLIMIT EXPUNGE PROPERTIES
-%token SET LOGFILE DAEMON SYSLOG IDFILE INVISIBLE POSTMASTER WARNINGS
+%token SET LOGFILE DAEMON SYSLOG IDFILE INVISIBLE POSTMASTER BOUNCEMAIL
 %token <proto> PROTO
 %token <sval>  STRING
 %token <number> NUMBER
@@ -88,6 +88,8 @@ statement	: SET LOGFILE optmap STRING	{run.logfile = xstrdup($4);}
 		| SET IDFILE optmap STRING	{run.idfile = xstrdup($4);}
 		| SET DAEMON optmap NUMBER	{run.poll_interval = $4;}
 		| SET POSTMASTER optmap STRING	{run.postmaster = xstrdup($4);}
+		| SET BOUNCEMAIL		{run.bouncemail = TRUE;}
+		| SET NO BOUNCEMAIL		{run.bouncemail = FALSE;}
 		| SET PROPERTIES optmap STRING	{run.properties =xstrdup($4);}
 		| SET SYSLOG			{run.use_syslog = TRUE;}
 		| SET INVISIBLE			{run.invisible = TRUE;}
diff --git a/sink.c b/sink.c
index 9a1ef93c..72d97904 100644
--- a/sink.c
+++ b/sink.c
@@ -252,18 +252,21 @@ static void sanitize(char *s)
     	*cp = '_';
 }
 
-static int send_bouncemail(struct msgblk *msg, int userclass,
-			   char *message, int nerrors, char *errors[])
+static int send_bouncemail(struct query *ctl, struct msgblk *msg,
+			   int userclass, char *message,
+			   int nerrors, char *errors[])
 /* bounce back an error report a la RFC 1892 */
 {
     char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
-    char boundary[BUFSIZ], *ts;
+    char boundary[BUFSIZ], *ts, *bounce_to;
     int sock;
 
     /* don't bounce  in reply to undeliverable bounces */
     if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
 	return(FALSE);
 
+    bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
+
     SMTP_setmode(SMTP_MODE);
 
     strcat(daemon_name, fetchmailhost);
@@ -273,7 +276,7 @@ static int send_bouncemail(struct msgblk *msg, int userclass,
     		|| SMTP_ok(sock) != SM_OK 
 		|| SMTP_helo(sock, "localhost") != SM_OK
 		|| SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
-		|| SMTP_rcpt(sock, msg->return_path) != SM_OK
+		|| SMTP_rcpt(sock, bounce_to) != SM_OK
 		|| SMTP_data(sock) != SM_OK)
 	return(FALSE);
 
@@ -289,7 +292,7 @@ static int send_bouncemail(struct msgblk *msg, int userclass,
     /* bouncemail headers */
     SockPrintf(sock, "Return-Path: <>\r\n");
     SockPrintf(sock, "From: %s\r\n", daemon_name);
-    SockPrintf(sock, "To: %s\r\n", msg->return_path);
+    SockPrintf(sock, "To: %s\r\n", bounce_to);
     SockPrintf(sock, "MIME-Version: 1.0\r\n");
     SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
     SockPrintf(sock, "\r\n");
@@ -367,6 +370,7 @@ static int send_bouncemail(struct msgblk *msg, int userclass,
 
 static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
 /* handle SMTP errors based on the content of SMTP_response */
+/* Mail is deleted from the server if this function returns PS_REFUSED. */
 {
     int smtperr = atoi(smtp_response);
     char *responses[1];
@@ -399,7 +403,7 @@ static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
 	 * 571 = sendmail's "unsolicited email refused"
 	 *
 	 */
-	send_bouncemail(msg, XMIT_ACCEPT,
+	send_bouncemail(ctl, msg, XMIT_ACCEPT,
 			"Our spam filter rejected this transaction.\r\n", 
 			1, responses);
 	return(PS_REFUSED);
@@ -439,26 +443,26 @@ static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
 	 * ESMTP server.  Don't try to ship the message, 
 	 * and allow it to be deleted.
 	 */
-	send_bouncemail(msg, XMIT_ACCEPT,
+	send_bouncemail(ctl, msg, XMIT_ACCEPT,
 			"This message was too large.\r\n", 
 			1, responses);
-	return(PS_REFUSED);
-
+	return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
+  
     case 553: /* invalid sending domain */
 	/*
 	 * These latter days 553 usually means a spammer is trying to
 	 * cover his tracks.
 	 */
-	send_bouncemail(msg, XMIT_ACCEPT,
+	send_bouncemail(ctl, msg, XMIT_ACCEPT,
 			"Invalid address.\r\n", 
 			1, responses);
 	return(PS_REFUSED);
 
     default:	/* bounce the error back to the sender */
-	if (send_bouncemail(msg, XMIT_ACCEPT,
+	if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
 			"General SMTP/ESMTP error.\r\n", 
 			1, responses))
-	    return(PS_REFUSED);
+	    return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
 	else
 	    return(PS_TRANSIENT);
     }
@@ -761,7 +765,7 @@ int open_sink(struct query *ctl, struct msgblk *msg,
 		}
 	    }
 	if (*bad_addresses)
-	    send_bouncemail(msg, XMIT_RCPTBAD,
+	    send_bouncemail(ctl, msg, XMIT_RCPTBAD,
                             "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
                             *bad_addresses, from_responses);
 	/*
@@ -941,13 +945,15 @@ int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
 		else
 		    /*
 		     * One or more deliveries failed.
-		     * If we can bounce a failures list back to the sender,
- 		     * return TRUE, deleting the message from the server so
- 		     * it won't be re-forwarded on subsequent poll cycles.
+		     * If we can bounce a failures list back to the
+		     * sender, and the postmaster does not want to
+		     * deal with the bounces return TRUE, deleting the
+		     * message from the server so it won't be
+		     * re-forwarded on subsequent poll cycles.
 		     */
-		    return(send_bouncemail(msg, XMIT_ACCEPT,
-				   "LSMTP partial delivery failure.\r\n",
-				   errors, responses));
+ 		  return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
+					 "LSMTP partial delivery failure.\r\n",
+					 errors, responses));
 	    }
     }
 
-- 
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