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-rw-r--r--src/oqmgr/qmgr_scan.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/src/oqmgr/qmgr_scan.c b/src/oqmgr/qmgr_scan.c
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+++ b/src/oqmgr/qmgr_scan.c
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+/*++
+/* NAME
+/* qmgr_scan 3
+/* SUMMARY
+/* queue scanning
+/* SYNOPSIS
+/* #include "qmgr.h"
+/*
+/* QMGR_SCAN *qmgr_scan_create(queue_name)
+/* const char *queue_name;
+/*
+/* char *qmgr_scan_next(scan_info)
+/* QMGR_SCAN *scan_info;
+/*
+/* void qmgr_scan_request(scan_info, flags)
+/* QMGR_SCAN *scan_info;
+/* int flags;
+/* DESCRIPTION
+/* This module implements queue scans. A queue scan always runs
+/* to completion, so that all files get a fair chance. The caller
+/* can request that a queue scan be restarted once it completes.
+/*
+/* qmgr_scan_create() creates a context for scanning the named queue,
+/* but does not start a queue scan.
+/*
+/* qmgr_scan_next() returns the base name of the next queue file.
+/* A null pointer means that no file was found. qmgr_scan_next()
+/* automagically restarts a queue scan when a scan request had
+/* arrived while the scan was in progress.
+/*
+/* qmgr_scan_request() records a request for the next queue scan. The
+/* flags argument is the bit-wise OR of zero or more of the following,
+/* unrecognized flags being ignored:
+/* .IP QMGR_FLUSH_ONCE
+/* Forget state information about dead hosts or transports.
+/* This request takes effect immediately.
+/* .IP QMGR_FLUSH_DFXP
+/* Override the defer_transports setting. This takes effect
+/* immediately when a queue scan is in progress, and affects
+/* the next queue scan.
+/* .IP QMGR_SCAN_ALL
+/* Ignore queue file time stamps. This takes effect immediately
+/* when a queue scan is in progress, and affects the next queue
+/* scan.
+/* .IP QMGR_SCAN_START
+/* Start a queue scan when none is in progress, or restart the
+/* current scan upon completion.
+/* DIAGNOSTICS
+/* Fatal: out of memory.
+/* Panic: interface violations, internal consistency errors.
+/* 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <scan_dir.h>
+
+/* Global library. */
+
+#include <mail_scan_dir.h>
+
+/* Application-specific. */
+
+#include "qmgr.h"
+
+/* qmgr_scan_start - start queue scan */
+
+static void qmgr_scan_start(QMGR_SCAN *scan_info)
+{
+ const char *myname = "qmgr_scan_start";
+
+ /*
+ * Sanity check.
+ */
+ if (scan_info->handle)
+ msg_panic("%s: %s queue scan in progress",
+ myname, scan_info->queue);
+
+ /*
+ * Give the poor tester a clue.
+ */
+ if (msg_verbose)
+ msg_info("%s: %sstart %s queue scan",
+ myname,
+ scan_info->nflags & QMGR_SCAN_START ? "re" : "",
+ scan_info->queue);
+
+ /*
+ * Start or restart the scan.
+ */
+ scan_info->flags = scan_info->nflags;
+ scan_info->nflags = 0;
+ scan_info->handle = scan_dir_open(scan_info->queue);
+}
+
+/* qmgr_scan_request - request for future scan */
+
+void qmgr_scan_request(QMGR_SCAN *scan_info, int flags)
+{
+
+ /*
+ * Apply "forget all dead destinations" requests immediately. Throttle
+ * dead transports and queues at the earliest opportunity: preferably
+ * during an already ongoing queue scan, otherwise the throttling will
+ * have to wait until a "start scan" trigger arrives.
+ *
+ * The QMGR_FLUSH_ONCE request always comes with QMGR_FLUSH_DFXP, and
+ * sometimes it also comes with QMGR_SCAN_ALL. It becomes a completely
+ * different story when a flush request is encoded in file permissions.
+ */
+ if (flags & QMGR_FLUSH_ONCE)
+ qmgr_enable_all();
+
+ /*
+ * Apply "ignore time stamp" requests also towards the scan that is
+ * already in progress.
+ */
+ if (scan_info->handle != 0 && (flags & QMGR_SCAN_ALL))
+ scan_info->flags |= QMGR_SCAN_ALL;
+
+ /*
+ * Apply "override defer_transports" requests also towards the scan that
+ * is already in progress.
+ */
+ if (scan_info->handle != 0 && (flags & QMGR_FLUSH_DFXP))
+ scan_info->flags |= QMGR_FLUSH_DFXP;
+
+ /*
+ * If a scan is in progress, just record the request.
+ */
+ scan_info->nflags |= flags;
+ if (scan_info->handle == 0 && (flags & QMGR_SCAN_START) != 0) {
+ scan_info->nflags &= ~QMGR_SCAN_START;
+ qmgr_scan_start(scan_info);
+ }
+}
+
+/* qmgr_scan_next - look for next queue file */
+
+char *qmgr_scan_next(QMGR_SCAN *scan_info)
+{
+ char *path = 0;
+
+ /*
+ * Restart the scan if we reach the end and a queue scan request has
+ * arrived in the mean time.
+ */
+ if (scan_info->handle && (path = mail_scan_dir_next(scan_info->handle)) == 0) {
+ scan_info->handle = scan_dir_close(scan_info->handle);
+ if (msg_verbose && (scan_info->nflags & QMGR_SCAN_START) == 0)
+ msg_info("done %s queue scan", scan_info->queue);
+ }
+ if (!scan_info->handle && (scan_info->nflags & QMGR_SCAN_START)) {
+ qmgr_scan_start(scan_info);
+ path = mail_scan_dir_next(scan_info->handle);
+ }
+ return (path);
+}
+
+/* qmgr_scan_create - create queue scan context */
+
+QMGR_SCAN *qmgr_scan_create(const char *queue)
+{
+ QMGR_SCAN *scan_info;
+
+ scan_info = (QMGR_SCAN *) mymalloc(sizeof(*scan_info));
+ scan_info->queue = mystrdup(queue);
+ scan_info->flags = scan_info->nflags = 0;
+ scan_info->handle = 0;
+ return (scan_info);
+}