Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 187 insertions, 0 deletions

diff --git a/src/local/unknown.c b/src/local/unknown.c
new file mode 100644
index 0000000..e643aad
--- /dev/null
+++ b/src/local/unknown.c
@@ -0,0 +1,187 @@
+/*++
+/* NAME
+/*	unknown 3
+/* SUMMARY
+/*	delivery of unknown recipients
+/* SYNOPSIS
+/*	#include "local.h"
+/*
+/*	int	deliver_unknown(state, usr_attr)
+/*	LOCAL_STATE state;
+/*	USER_ATTR usr_attr;
+/* DESCRIPTION
+/*	deliver_unknown() delivers a message for unknown recipients.
+/* .IP \(bu
+/*	If an alternative message transport is specified via the
+/*	fallback_transport parameter, delivery is delegated to the
+/*	named transport.
+/* .IP \(bu
+/*	If an alternative address is specified via the luser_relay
+/*	configuration parameter, mail is forwarded to that address.
+/* .IP \(bu
+/*	Otherwise the recipient is bounced.
+/* .PP
+/*	The luser_relay parameter is subjected to $name expansion of
+/*	the standard message attributes: $user, $home, $shell, $domain,
+/*	$recipient, $mailbox, $extension, $recipient_delimiter, not
+/*	all of which actually make sense.
+/*
+/*	Arguments:
+/* .IP state
+/*	Message delivery attributes (sender, recipient etc.).
+/*	Attributes describing alias, include or forward expansion.
+/*	A table with the results from expanding aliases or lists.
+/*	A table with delivered-to: addresses taken from the message.
+/* .IP usr_attr
+/*	Attributes describing user rights and environment.
+/* DIAGNOSTICS
+/*	The result status is non-zero when delivery should be tried again.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <stringops.h>
+#include <mymalloc.h>
+#include <vstring.h>
+
+/* Global library. */
+
+#include <been_here.h>
+#include <mail_params.h>
+#include <mail_proto.h>
+#include <bounce.h>
+#include <mail_addr.h>
+#include <sent.h>
+#include <deliver_pass.h>
+#include <defer.h>
+#include <canon_addr.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+#define STREQ(x,y) (strcasecmp((x),(y)) == 0)
+
+/* deliver_unknown - delivery for unknown recipients */
+
+int     deliver_unknown(LOCAL_STATE state, USER_ATTR usr_attr)
+{
+    const char *myname = "deliver_unknown";
+    int     status;
+    VSTRING *expand_luser;
+    VSTRING *canon_luser;
+    static MAPS *transp_maps;
+    const char *map_transport;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+    /*
+     * DUPLICATE/LOOP ELIMINATION
+     * 
+     * Don't deliver the same user twice.
+     */
+    if (been_here(state.dup_filter, "%s %s", myname, state.msg_attr.local))
+	return (0);
+
+    /*
+     * The fall-back transport specifies a delivery machanism that handles
+     * users not found in the aliases or UNIX passwd databases.
+     */
+    if (*var_fbck_transp_maps && transp_maps == 0)
+	transp_maps = maps_create(VAR_FBCK_TRANSP_MAPS, var_fbck_transp_maps,
+				  DICT_FLAG_LOCK | DICT_FLAG_NO_REGSUB
+				  | DICT_FLAG_UTF8_REQUEST);
+    /* The -1 is a hint for the down-stream deliver_completed() function. */
+    if (transp_maps
+	&& (map_transport = maps_find(transp_maps, state.msg_attr.user,
+				      DICT_FLAG_NONE)) != 0) {
+	state.msg_attr.rcpt.offset = -1L;
+	return (deliver_pass(MAIL_CLASS_PRIVATE, map_transport,
+			     state.request, &state.msg_attr.rcpt));
+    } else if (transp_maps && transp_maps->error != 0) {
+	/* Details in the logfile. */
+	dsb_simple(state.msg_attr.why, "4.3.0", "table lookup failure");
+	return (defer_append(BOUNCE_FLAGS(state.request),
+			     BOUNCE_ATTR(state.msg_attr)));
+    }
+    if (*var_fallback_transport) {
+	state.msg_attr.rcpt.offset = -1L;
+	return (deliver_pass(MAIL_CLASS_PRIVATE, var_fallback_transport,
+			     state.request, &state.msg_attr.rcpt));
+    }
+
+    /*
+     * Subject the luser_relay address to $name expansion, disable
+     * propagation of unmatched address extension, and re-inject the address
+     * into the delivery machinery. Do not give special treatment to "|stuff"
+     * or /stuff.
+     */
+    if (*var_luser_relay) {
+	state.msg_attr.unmatched = 0;
+	expand_luser = vstring_alloc(100);
+	canon_luser = vstring_alloc(100);
+	local_expand(expand_luser, var_luser_relay, &state, &usr_attr, (void *) 0);
+	/* In case luser_relay specifies a domain-less address. */
+	canon_addr_external(canon_luser, vstring_str(expand_luser));
+	/* Assumes that the address resolver won't change the address. */
+	if (STREQ(vstring_str(canon_luser), state.msg_attr.rcpt.address)) {
+	    dsb_simple(state.msg_attr.why, "5.1.1",
+		       "unknown user: \"%s\"", state.msg_attr.user);
+	    status = bounce_append(BOUNCE_FLAGS(state.request),
+				   BOUNCE_ATTR(state.msg_attr));
+	} else {
+	    status = deliver_resolve_addr(state, usr_attr, STR(expand_luser));
+	}
+	vstring_free(canon_luser);
+	vstring_free(expand_luser);
+	return (status);
+    }
+
+    /*
+     * If no alias was found for a required reserved name, toss the message
+     * into the bit bucket, and issue a warning instead.
+     */
+    if (STREQ(state.msg_attr.user, MAIL_ADDR_MAIL_DAEMON)
+	|| STREQ(state.msg_attr.user, MAIL_ADDR_POSTMASTER)) {
+	msg_warn("required alias not found: %s", state.msg_attr.user);
+	dsb_simple(state.msg_attr.why, "2.0.0", "discarded");
+	return (sent(BOUNCE_FLAGS(state.request), SENT_ATTR(state.msg_attr)));
+    }
+
+    /*
+     * Bounce the message when no luser relay is specified.
+     */
+    dsb_simple(state.msg_attr.why, "5.1.1",
+	       "unknown user: \"%s\"", state.msg_attr.user);
+    return (bounce_append(BOUNCE_FLAGS(state.request),
+			  BOUNCE_ATTR(state.msg_attr)));
+}