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-rw-r--r--src/openvpn/mstats.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/src/openvpn/mstats.c b/src/openvpn/mstats.c
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+++ b/src/openvpn/mstats.c
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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2011 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * Maintain usage stats in a memory-mapped file
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#if defined(ENABLE_MEMSTATS)
+
+#include <sys/mman.h>
+
+#include "error.h"
+#include "misc.h"
+#include "mstats.h"
+
+#include "memdbg.h"
+
+volatile struct mmap_stats *mmap_stats = NULL; /* GLOBAL */
+static char mmap_fn[128];
+
+void
+mstats_open(const char *fn)
+{
+ void *data;
+ ssize_t stat;
+ int fd;
+ struct mmap_stats ms;
+
+ if (mmap_stats) /* already called? */
+ return;
+
+ /* verify that filename is not too long */
+ if (strlen(fn) >= sizeof(mmap_fn))
+ msg (M_FATAL, "mstats_open: filename too long");
+
+ /* create file that will be memory mapped */
+ fd = open (fn, O_CREAT | O_TRUNC | O_RDWR, S_IRUSR | S_IWUSR);
+ if (fd < 0)
+ {
+ msg (M_ERR, "mstats_open: cannot open: %s", fn);
+ return;
+ }
+
+ /* set the file to the correct size to contain a
+ struct mmap_stats, and zero it */
+ CLEAR(ms);
+ ms.state = MSTATS_ACTIVE;
+ stat = write(fd, &ms, sizeof(ms));
+ if (stat != sizeof(ms))
+ {
+ msg (M_ERR, "mstats_open: write error: %s", fn);
+ close(fd);
+ return;
+ }
+
+ /* mmap the file */
+ data = mmap(NULL, sizeof(struct mmap_stats), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ if (data == MAP_FAILED)
+ {
+ msg (M_ERR, "mstats_open: write error: %s", fn);
+ close(fd);
+ return;
+ }
+
+ /* close the fd (mmap now controls the file) */
+ if (close(fd))
+ {
+ msg (M_ERR, "mstats_open: close error: %s", fn);
+ }
+
+ /* save filename so we can delete it later */
+ strcpy(mmap_fn, fn);
+
+ /* save a global pointer to memory-mapped region */
+ mmap_stats = (struct mmap_stats *)data;
+
+ msg (M_INFO, "memstats data will be written to %s", fn);
+}
+
+void
+mstats_close(void)
+{
+ if (mmap_stats)
+ {
+ mmap_stats->state = MSTATS_EXPIRED;
+ if (munmap((void *)mmap_stats, sizeof(struct mmap_stats)))
+ msg (M_WARN | M_ERRNO, "mstats_close: munmap error");
+ platform_unlink(mmap_fn);
+ mmap_stats = NULL;
+ }
+}
+
+#endif