Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 458 insertions, 0 deletions

diff --git a/src/qmgr/qmgr_deliver.c b/src/qmgr/qmgr_deliver.c
new file mode 100644
index 0000000..fe4cf0c
--- /dev/null
+++ b/src/qmgr/qmgr_deliver.c
@@ -0,0 +1,458 @@
+/*++
+/* NAME
+/*	qmgr_deliver 3
+/* SUMMARY
+/*	deliver one per-site queue entry to that site
+/* SYNOPSIS
+/*	#include "qmgr.h"
+/*
+/*	int	qmgr_deliver_concurrency;
+/*
+/*	int	qmgr_deliver(transport, fp)
+/*	QMGR_TRANSPORT *transport;
+/*	VSTREAM	*fp;
+/* DESCRIPTION
+/*	This module implements the client side of the `queue manager
+/*	to delivery agent' protocol. The queue manager uses
+/*	asynchronous I/O so that it can drive multiple delivery
+/*	agents in parallel. Depending on the outcome of a delivery
+/*	attempt, the status of messages, queues and transports is
+/*	updated.
+/*
+/*	qmgr_deliver_concurrency is a global counter that says how
+/*	many delivery processes are in use. This can be used, for
+/*	example, to control the size of the `active' message queue.
+/*
+/*	qmgr_deliver() executes when a delivery process announces its
+/*	availability for the named transport. It arranges for delivery
+/*	of a suitable queue entry.  The \fIfp\fR argument specifies a
+/*	stream that is connected to a delivery process, or a null
+/*	pointer if the transport accepts no connection. Upon completion
+/*	of delivery (successful or not), the stream is closed, so that the
+/*	delivery process is released.
+/* DIAGNOSTICS
+/* 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
+/*
+/*	Preemptive scheduler enhancements:
+/*	Patrik Rak
+/*	Modra 6
+/*	155 00, Prague, Czech Republic
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <time.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <events.h>
+#include <iostuff.h>
+#include <stringops.h>
+#include <mymalloc.h>
+
+/* Global library. */
+
+#include <mail_queue.h>
+#include <mail_proto.h>
+#include <recipient_list.h>
+#include <mail_params.h>
+#include <deliver_request.h>
+#include <verp_sender.h>
+#include <dsn_util.h>
+#include <dsn_buf.h>
+#include <dsb_scan.h>
+#include <rcpt_print.h>
+#include <smtputf8.h>
+
+/* Application-specific. */
+
+#include "qmgr.h"
+
+ /*
+  * Important note on the _transport_rate_delay implementation: after
+  * qmgr_transport_alloc() sets the QMGR_TRANSPORT_STAT_RATE_LOCK flag, all
+  * code paths must directly or indirectly invoke qmgr_transport_unthrottle()
+  * or qmgr_transport_throttle(). Otherwise, transports with non-zero
+  * _transport_rate_delay will become stuck.
+  */
+
+int     qmgr_deliver_concurrency;
+
+ /*
+  * Message delivery status codes.
+  */
+#define DELIVER_STAT_OK		0	/* all recipients delivered */
+#define DELIVER_STAT_DEFER	1	/* try some recipients later */
+#define DELIVER_STAT_CRASH	2	/* mailer internal problem */
+
+/* qmgr_deliver_initial_reply - retrieve initial delivery process response */
+
+static int qmgr_deliver_initial_reply(VSTREAM *stream)
+{
+    int     stat;
+
+    if (peekfd(vstream_fileno(stream)) < 0) {
+	msg_warn("%s: premature disconnect", VSTREAM_PATH(stream));
+	return (DELIVER_STAT_CRASH);
+    } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &stat),
+			 ATTR_TYPE_END) != 1) {
+	msg_warn("%s: malformed response", VSTREAM_PATH(stream));
+	return (DELIVER_STAT_CRASH);
+    } else {
+	return (stat ? DELIVER_STAT_DEFER : 0);
+    }
+}
+
+/* qmgr_deliver_final_reply - retrieve final delivery process response */
+
+static int qmgr_deliver_final_reply(VSTREAM *stream, DSN_BUF *dsb)
+{
+    int     stat;
+
+    if (peekfd(vstream_fileno(stream)) < 0) {
+	msg_warn("%s: premature disconnect", VSTREAM_PATH(stream));
+	return (DELIVER_STAT_CRASH);
+    } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_FUNC(dsb_scan, (void *) dsb),
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &stat),
+			 ATTR_TYPE_END) != 2) {
+	msg_warn("%s: malformed response", VSTREAM_PATH(stream));
+	return (DELIVER_STAT_CRASH);
+    } else {
+	return (stat ? DELIVER_STAT_DEFER : 0);
+    }
+}
+
+/* qmgr_deliver_send_request - send delivery request to delivery process */
+
+static int qmgr_deliver_send_request(QMGR_ENTRY *entry, VSTREAM *stream)
+{
+    RECIPIENT_LIST list = entry->rcpt_list;
+    RECIPIENT *recipient;
+    QMGR_MESSAGE *message = entry->message;
+    VSTRING *sender_buf = 0;
+    MSG_STATS stats;
+    char   *sender;
+    int     flags;
+    int     smtputf8 = message->smtputf8;
+    const char *addr;
+
+    /*
+     * Todo: integrate with code up-stream that builds the delivery request.
+     */
+    for (recipient = list.info; recipient < list.info + list.len; recipient++)
+	if (var_smtputf8_enable && (addr = recipient->address)[0]
+	    && !allascii(addr) && valid_utf8_string(addr, strlen(addr))) {
+	    smtputf8 |= SMTPUTF8_FLAG_RECIPIENT;
+	    if (message->verp_delims)
+		smtputf8 |= SMTPUTF8_FLAG_SENDER;
+	}
+
+    /*
+     * If variable envelope return path is requested, change prefix+@origin
+     * into prefix+user=domain@origin. Note that with VERP there is only one
+     * recipient per delivery.
+     */
+    if (message->verp_delims == 0) {
+	sender = message->sender;
+    } else {
+	sender_buf = vstring_alloc(100);
+	verp_sender(sender_buf, message->verp_delims,
+		    message->sender, list.info);
+	sender = vstring_str(sender_buf);
+    }
+
+    flags = message->tflags
+	| entry->queue->dflags
+	| (message->inspect_xport ? DEL_REQ_FLAG_BOUNCE : DEL_REQ_FLAG_DEFLT);
+    (void) QMGR_MSG_STATS(&stats, message);
+    attr_print(stream, ATTR_FLAG_NONE,
+	       SEND_ATTR_INT(MAIL_ATTR_FLAGS, flags),
+	       SEND_ATTR_STR(MAIL_ATTR_QUEUE, message->queue_name),
+	       SEND_ATTR_STR(MAIL_ATTR_QUEUEID, message->queue_id),
+	       SEND_ATTR_LONG(MAIL_ATTR_OFFSET, message->data_offset),
+	       SEND_ATTR_LONG(MAIL_ATTR_SIZE, message->cont_length),
+	       SEND_ATTR_STR(MAIL_ATTR_NEXTHOP, entry->queue->nexthop),
+	       SEND_ATTR_STR(MAIL_ATTR_ENCODING, message->encoding),
+	       SEND_ATTR_INT(MAIL_ATTR_SMTPUTF8, smtputf8),
+	       SEND_ATTR_STR(MAIL_ATTR_SENDER, sender),
+	       SEND_ATTR_STR(MAIL_ATTR_DSN_ENVID, message->dsn_envid),
+	       SEND_ATTR_INT(MAIL_ATTR_DSN_RET, message->dsn_ret),
+	       SEND_ATTR_FUNC(msg_stats_print, (void *) &stats),
+    /* XXX Should be encapsulated with ATTR_TYPE_FUNC. */
+	     SEND_ATTR_STR(MAIL_ATTR_LOG_CLIENT_NAME, message->client_name),
+	     SEND_ATTR_STR(MAIL_ATTR_LOG_CLIENT_ADDR, message->client_addr),
+	     SEND_ATTR_STR(MAIL_ATTR_LOG_CLIENT_PORT, message->client_port),
+	     SEND_ATTR_STR(MAIL_ATTR_LOG_PROTO_NAME, message->client_proto),
+	       SEND_ATTR_STR(MAIL_ATTR_LOG_HELO_NAME, message->client_helo),
+    /* XXX Should be encapsulated with ATTR_TYPE_FUNC. */
+	       SEND_ATTR_STR(MAIL_ATTR_SASL_METHOD, message->sasl_method),
+	     SEND_ATTR_STR(MAIL_ATTR_SASL_USERNAME, message->sasl_username),
+	       SEND_ATTR_STR(MAIL_ATTR_SASL_SENDER, message->sasl_sender),
+    /* XXX Ditto if we want to pass TLS certificate info. */
+	       SEND_ATTR_STR(MAIL_ATTR_LOG_IDENT, message->log_ident),
+	     SEND_ATTR_STR(MAIL_ATTR_RWR_CONTEXT, message->rewrite_context),
+	       SEND_ATTR_INT(MAIL_ATTR_RCPT_COUNT, list.len),
+	       ATTR_TYPE_END);
+    if (sender_buf != 0)
+	vstring_free(sender_buf);
+    for (recipient = list.info; recipient < list.info + list.len; recipient++)
+	attr_print(stream, ATTR_FLAG_NONE,
+		   SEND_ATTR_FUNC(rcpt_print, (void *) recipient),
+		   ATTR_TYPE_END);
+    if (vstream_fflush(stream) != 0) {
+	msg_warn("write to process (%s): %m", entry->queue->transport->name);
+	return (-1);
+    } else {
+	if (msg_verbose)
+	    msg_info("qmgr_deliver: site `%s'", entry->queue->name);
+	return (0);
+    }
+}
+
+/* qmgr_deliver_abort - transport response watchdog */
+
+static void qmgr_deliver_abort(int unused_event, void *context)
+{
+    QMGR_ENTRY *entry = (QMGR_ENTRY *) context;
+    QMGR_QUEUE *queue = entry->queue;
+    QMGR_TRANSPORT *transport = queue->transport;
+    QMGR_MESSAGE *message = entry->message;
+
+    msg_fatal("%s: timeout receiving delivery status from transport: %s",
+	      message->queue_id, transport->name);
+}
+
+/* qmgr_deliver_update - process delivery status report */
+
+static void qmgr_deliver_update(int unused_event, void *context)
+{
+    QMGR_ENTRY *entry = (QMGR_ENTRY *) context;
+    QMGR_QUEUE *queue = entry->queue;
+    QMGR_TRANSPORT *transport = queue->transport;
+    QMGR_MESSAGE *message = entry->message;
+    static DSN_BUF *dsb;
+    int     status;
+
+    /*
+     * Release the delivery agent from a "hot" queue entry.
+     */
+#define QMGR_DELIVER_RELEASE_AGENT(entry) do { \
+	event_disable_readwrite(vstream_fileno(entry->stream)); \
+	(void) vstream_fclose(entry->stream); \
+	entry->stream = 0; \
+	qmgr_deliver_concurrency--; \
+    } while (0)
+
+    if (dsb == 0)
+	dsb = dsb_create();
+
+    /*
+     * The message transport has responded. Stop the watchdog timer.
+     */
+    event_cancel_timer(qmgr_deliver_abort, context);
+
+    /*
+     * Retrieve the delivery agent status report. The numerical status code
+     * indicates if delivery should be tried again. The reason text is sent
+     * only when a site should be avoided for a while, so that the queue
+     * manager can log why it does not even try to schedule delivery to the
+     * affected recipients.
+     */
+    status = qmgr_deliver_final_reply(entry->stream, dsb);
+
+    /*
+     * The mail delivery process failed for some reason (although delivery
+     * may have been successful). Back off with this transport type for a
+     * while. Dispose of queue entries for this transport that await
+     * selection (the todo lists). Stay away from queue entries that have
+     * been selected (the busy lists), or we would have dangling pointers.
+     * The queue itself won't go away before we dispose of the current queue
+     * entry.
+     */
+    if (status == DELIVER_STAT_CRASH) {
+	message->flags |= DELIVER_STAT_DEFER;
+#if 0
+	whatsup = concatenate("unknown ", transport->name,
+			      " mail transport error", (char *) 0);
+	qmgr_transport_throttle(transport,
+				DSN_SIMPLE(&dsb->dsn, "4.3.0", whatsup));
+	myfree(whatsup);
+#else
+	qmgr_transport_throttle(transport,
+				DSN_SIMPLE(&dsb->dsn, "4.3.0",
+					   "unknown mail transport error"));
+#endif
+	msg_warn("transport %s failure -- see a previous warning/fatal/panic logfile record for the problem description",
+		 transport->name);
+
+	/*
+	 * Assume the worst and write a defer logfile record for each
+	 * recipient. This omission was already present in the first queue
+	 * manager implementation of 199703, and was fixed 200511.
+	 * 
+	 * To avoid the synchronous qmgr_defer_recipient() operation for each
+	 * recipient of this queue entry, release the delivery process and
+	 * move the entry back to the todo queue. Let qmgr_defer_transport()
+	 * log the recipient asynchronously if possible, and get out of here.
+	 * Note: if asynchronous logging is not possible,
+	 * qmgr_defer_transport() eventually invokes qmgr_entry_done() and
+	 * the entry becomes a dangling pointer.
+	 */
+	QMGR_DELIVER_RELEASE_AGENT(entry);
+	qmgr_entry_unselect(entry);
+	qmgr_defer_transport(transport, &dsb->dsn);
+	return;
+    }
+
+    /*
+     * This message must be tried again.
+     * 
+     * If we have a problem talking to this site, back off with this site for a
+     * while; dispose of queue entries for this site that await selection
+     * (the todo list); stay away from queue entries that have been selected
+     * (the busy list), or we would have dangling pointers. The queue itself
+     * won't go away before we dispose of the current queue entry.
+     * 
+     * XXX Caution: DSN_COPY() will panic on empty status or reason.
+     */
+#define SUSPENDED	"delivery temporarily suspended: "
+
+    if (status == DELIVER_STAT_DEFER) {
+	message->flags |= DELIVER_STAT_DEFER;
+	if (VSTRING_LEN(dsb->status)) {
+	    /* Sanitize the DSN status/reason from the delivery agent. */
+	    if (!dsn_valid(vstring_str(dsb->status)))
+		vstring_strcpy(dsb->status, "4.0.0");
+	    if (VSTRING_LEN(dsb->reason) == 0)
+		vstring_strcpy(dsb->reason, "unknown error");
+	    vstring_prepend(dsb->reason, SUSPENDED, sizeof(SUSPENDED) - 1);
+	    if (QMGR_QUEUE_READY(queue)) {
+		qmgr_queue_throttle(queue, DSN_FROM_DSN_BUF(dsb));
+		if (QMGR_QUEUE_THROTTLED(queue))
+		    qmgr_defer_todo(queue, &dsb->dsn);
+	    }
+	}
+    }
+
+    /*
+     * No problems detected. Mark the transport and queue as alive. The queue
+     * itself won't go away before we dispose of the current queue entry.
+     */
+    if (status != DELIVER_STAT_CRASH) {
+	qmgr_transport_unthrottle(transport);
+	if (VSTRING_LEN(dsb->reason) == 0)
+	    qmgr_queue_unthrottle(queue);
+    }
+
+    /*
+     * Release the delivery process, and give some other queue entry a chance
+     * to be delivered. When all recipients for a message have been tried,
+     * decide what to do next with this message: defer, bounce, delete.
+     */
+    QMGR_DELIVER_RELEASE_AGENT(entry);
+    qmgr_entry_done(entry, QMGR_QUEUE_BUSY);
+}
+
+/* qmgr_deliver - deliver one per-site queue entry */
+
+void    qmgr_deliver(QMGR_TRANSPORT *transport, VSTREAM *stream)
+{
+    QMGR_ENTRY *entry;
+    DSN     dsn;
+
+    /*
+     * Find out if this delivery process is really available. Once elected,
+     * the delivery process is supposed to express its happiness. If there is
+     * a problem, wipe the pending deliveries for this transport. This
+     * routine runs in response to an external event, so it does not run
+     * while some other queue manipulation is happening.
+     */
+    if (stream == 0 || qmgr_deliver_initial_reply(stream) != 0) {
+#if 0
+	whatsup = concatenate(transport->name,
+			      " mail transport unavailable", (char *) 0);
+	qmgr_transport_throttle(transport,
+				DSN_SIMPLE(&dsn, "4.3.0", whatsup));
+	myfree(whatsup);
+#else
+	qmgr_transport_throttle(transport,
+				DSN_SIMPLE(&dsn, "4.3.0",
+					   "mail transport unavailable"));
+#endif
+	qmgr_defer_transport(transport, &dsn);
+	if (stream)
+	    (void) vstream_fclose(stream);
+	return;
+    }
+
+    /*
+     * Find a suitable queue entry. Things may have changed since this
+     * transport was allocated. If no suitable entry is found,
+     * unceremoniously disconnect from the delivery process. The delivery
+     * agent request reading routine is prepared for the queue manager to
+     * change its mind for no apparent reason.
+     */
+    if ((entry = qmgr_job_entry_select(transport)) == 0) {
+	(void) vstream_fclose(stream);
+	return;
+    }
+
+    /*
+     * Send the queue file info and recipient info to the delivery process.
+     * If there is a problem, wipe the pending deliveries for this transport.
+     * This routine runs in response to an external event, so it does not run
+     * while some other queue manipulation is happening.
+     */
+    if (qmgr_deliver_send_request(entry, stream) < 0) {
+	qmgr_entry_unselect(entry);
+#if 0
+	whatsup = concatenate(transport->name,
+			      " mail transport unavailable", (char *) 0);
+	qmgr_transport_throttle(transport,
+				DSN_SIMPLE(&dsn, "4.3.0", whatsup));
+	myfree(whatsup);
+#else
+	qmgr_transport_throttle(transport,
+				DSN_SIMPLE(&dsn, "4.3.0",
+					   "mail transport unavailable"));
+#endif
+	qmgr_defer_transport(transport, &dsn);
+	/* warning: entry may be a dangling pointer here */
+	(void) vstream_fclose(stream);
+	return;
+    }
+
+    /*
+     * If we get this far, go wait for the delivery status report.
+     */
+    qmgr_deliver_concurrency++;
+    entry->stream = stream;
+    event_enable_read(vstream_fileno(stream),
+		      qmgr_deliver_update, (void *) entry);
+
+    /*
+     * Guard against broken systems.
+     */
+    event_request_timer(qmgr_deliver_abort, (void *) entry, var_daemon_timeout);
+}