1 files changed, 198 insertions, 0 deletions
diff --git a/src/app-layer-htp-mem.c b/src/app-layer-htp-mem.c
new file mode 100644
index 0000000..bd9b79f
--- /dev/null
+++ b/src/app-layer-htp-mem.c
@@ -0,0 +1,198 @@
+/* Copyright (C) 2013 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program 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
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \ingroup httplayer
+ *
+ * @{
+ */
+
+/**
+ * \file
+ *
+ * \author Eric Leblond <eric@regit.org>
+ *
+ * This file provides a memory handling for the HTTP protocol support.
+ */
+
+#include "suricata-common.h"
+#include "app-layer-htp-mem.h"
+
+#include "conf.h"
+#include "util-misc.h"
+#include "util-debug.h"
+
+SC_ATOMIC_DECLARE(uint64_t, htp_config_memcap);
+SC_ATOMIC_DECLARE(uint64_t, htp_memuse);
+SC_ATOMIC_DECLARE(uint64_t, htp_memcap);
+
+void HTPParseMemcap(void)
+{
+    const char *conf_val;
+
+    SC_ATOMIC_INIT(htp_config_memcap);
+
+    /** set config values for memcap, prealloc and hash_size */
+    uint64_t memcap;
+    if ((ConfGet("app-layer.protocols.http.memcap", &conf_val)) == 1)
+    {
+        if (ParseSizeStringU64(conf_val, &memcap) < 0) {
+            SCLogError("Error parsing http.memcap "
+                       "from conf file - %s.  Killing engine",
+                    conf_val);
+            exit(EXIT_FAILURE);
+        } else {
+            SC_ATOMIC_SET(htp_config_memcap, memcap);
+        }
+        SCLogInfo("HTTP memcap: %"PRIu64, SC_ATOMIC_GET(htp_config_memcap));
+    } else {
+        /* default to unlimited */
+        SC_ATOMIC_SET(htp_config_memcap, 0);
+    }
+
+    SC_ATOMIC_INIT(htp_memuse);
+    SC_ATOMIC_INIT(htp_memcap);
+}
+
+static void HTPIncrMemuse(uint64_t size)
+{
+    (void) SC_ATOMIC_ADD(htp_memuse, size);
+    return;
+}
+
+static void HTPDecrMemuse(uint64_t size)
+{
+    (void) SC_ATOMIC_SUB(htp_memuse, size);
+    return;
+}
+
+uint64_t HTPMemuseGlobalCounter(void)
+{
+    uint64_t tmpval = SC_ATOMIC_GET(htp_memuse);
+    return tmpval;
+}
+
+uint64_t HTPMemcapGlobalCounter(void)
+{
+    uint64_t tmpval = SC_ATOMIC_GET(htp_memcap);
+    return tmpval;
+}
+
+/**
+ *  \brief Check if alloc'ing "size" would mean we're over memcap
+ *
+ *  \retval 1 if in bounds
+ *  \retval 0 if not in bounds
+ */
+static int HTPCheckMemcap(uint64_t size)
+{
+    uint64_t memcapcopy = SC_ATOMIC_GET(htp_config_memcap);
+    if (memcapcopy == 0 || size + SC_ATOMIC_GET(htp_memuse) <= memcapcopy)
+        return 1;
+    (void) SC_ATOMIC_ADD(htp_memcap, 1);
+    return 0;
+}
+
+/**
+ *  \brief Update memcap value
+ *
+ *  \param size new memcap value
+ */
+int HTPSetMemcap(uint64_t size)
+{
+    if (size == 0 || (uint64_t)SC_ATOMIC_GET(htp_memuse) < size) {
+        SC_ATOMIC_SET(htp_config_memcap, size);
+        return 1;
+    }
+    return 0;
+}
+
+/**
+ *  \brief Update memcap value
+ *
+ *  \retval memcap value
+ */
+uint64_t HTPGetMemcap(void)
+{
+    uint64_t memcapcopy = SC_ATOMIC_GET(htp_config_memcap);
+    return memcapcopy;
+}
+
+void *HTPMalloc(size_t size)
+{
+    void *ptr = NULL;
+
+    if (HTPCheckMemcap((uint32_t)size) == 0)
+        return NULL;
+
+    ptr = SCMalloc(size);
+
+    if (unlikely(ptr == NULL))
+        return NULL;
+
+    HTPIncrMemuse((uint64_t)size);
+
+    return ptr;
+}
+
+void *HTPCalloc(size_t n, size_t size)
+{
+    void *ptr = NULL;
+
+    if (HTPCheckMemcap((uint32_t)(n * size)) == 0)
+        return NULL;
+
+    ptr = SCCalloc(n, size);
+
+    if (unlikely(ptr == NULL))
+        return NULL;
+
+    HTPIncrMemuse((uint64_t)(n * size));
+
+    return ptr;
+}
+
+void *HTPRealloc(void *ptr, size_t orig_size, size_t size)
+{
+    if (size > orig_size) {
+        if (HTPCheckMemcap((uint32_t)(size - orig_size)) == 0)
+            return NULL;
+    }
+
+    void *rptr = SCRealloc(ptr, size);
+    if (rptr == NULL)
+        return NULL;
+
+    if (size > orig_size) {
+        HTPIncrMemuse((uint64_t)(size - orig_size));
+    } else {
+        HTPDecrMemuse((uint64_t)(orig_size - size));
+    }
+
+    return rptr;
+}
+
+void HTPFree(void *ptr, size_t size)
+{
+    SCFree(ptr);
+
+    HTPDecrMemuse((uint64_t)size);
+}
+
+/**
+ * @}
+ */