suricata checkin based on commit id a4bce14770beee46a537eda3c3f6e8e8565d5d0a

Change-Id: I9a214fa0ee95e58fc640e50bd604dac7f42db48f

1 files changed, 204 insertions, 0 deletions

diff --git a/framework/src/suricata/src/util-var-name.c b/framework/src/suricata/src/util-var-name.c
new file mode 100644
index 00000000..91322189
--- /dev/null
+++ b/framework/src/suricata/src/util-var-name.c
@@ -0,0 +1,204 @@
+/* Copyright (C) 2007-2010 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.
+ */
+
+/**
+ * \file
+ *
+ * \author Victor Julien <victor@inliniac.net>
+ *
+ * Generic variable name utility functions
+ */
+
+#include "suricata-common.h"
+#include "detect.h"
+#include "util-hashlist.h"
+
+/** \brief Name2idx mapping structure for flowbits, flowvars and pktvars. */
+typedef struct VariableName_ {
+    char *name;
+    uint8_t type; /* flowbit, pktvar, etc */
+    uint8_t flags;
+    uint16_t idx;
+} VariableName;
+
+static uint32_t VariableNameHash(HashListTable *ht, void *buf, uint16_t buflen)
+{
+     VariableName *fn = (VariableName *)buf;
+     uint32_t hash = strlen(fn->name) + fn->type;
+     uint16_t u;
+
+     for (u = 0; u < buflen; u++) {
+         hash += fn->name[u];
+     }
+
+     return hash;
+}
+
+static char VariableNameCompare(void *buf1, uint16_t len1, void *buf2, uint16_t len2)
+{
+    VariableName *fn1 = (VariableName *)buf1;
+    VariableName *fn2 = (VariableName *)buf2;
+
+    if (fn1->type != fn2->type)
+        return 0;
+
+    if (strcmp(fn1->name,fn2->name) == 0)
+        return 1;
+
+    return 0;
+}
+
+static uint32_t VariableIdxHash(HashListTable *ht, void *buf, uint16_t buflen)
+{
+    VariableName *fn = (VariableName *)buf;
+    uint32_t hash = fn->idx + fn->type;
+    return hash;
+}
+
+static char VariableIdxCompare(void *buf1, uint16_t len1, void *buf2, uint16_t len2)
+{
+    VariableName *fn1 = (VariableName *)buf1;
+    VariableName *fn2 = (VariableName *)buf2;
+
+    if (fn1->type != fn2->type)
+        return 0;
+
+    if (fn1->idx == fn2->idx)
+        return 1;
+
+    return 0;
+}
+
+static void VariableNameFree(void *data)
+{
+    VariableName *fn = (VariableName *)data;
+
+    if (fn == NULL)
+        return;
+
+    if (fn->name != NULL) {
+        SCFree(fn->name);
+        fn->name = NULL;
+    }
+
+    SCFree(fn);
+}
+
+/** \brief Initialize the Name idx hash.
+ *  \param de_ctx Ptr to the detection engine ctx.
+ *  \retval -1 in case of error
+ *  \retval 0 in case of success
+ */
+int VariableNameInitHash(DetectEngineCtx *de_ctx)
+{
+    de_ctx->variable_names = HashListTableInit(4096, VariableNameHash, VariableNameCompare, VariableNameFree);
+    if (de_ctx->variable_names == NULL)
+        return -1;
+
+    de_ctx->variable_idxs = HashListTableInit(4096, VariableIdxHash, VariableIdxCompare, NULL);
+    if (de_ctx->variable_idxs == NULL)
+        return -1;
+
+    de_ctx->variable_names_idx = 0;
+    return 0;
+}
+
+void VariableNameFreeHash(DetectEngineCtx *de_ctx)
+{
+    if (de_ctx->variable_names != NULL) {
+        HashListTableFree(de_ctx->variable_names);
+        HashListTableFree(de_ctx->variable_idxs);
+        de_ctx->variable_names = NULL;
+        de_ctx->variable_idxs = NULL;
+    }
+
+    return;
+}
+
+/** \brief Get a name idx for a name. If the name is already used reuse the idx.
+ *  \param name nul terminated string with the name
+ *  \param type variable type
+ *  \retval 0 in case of error
+ *  \retval idx the idx or 0
+ */
+uint16_t VariableNameGetIdx(DetectEngineCtx *de_ctx, char *name, enum VarTypes type)
+{
+    uint16_t idx = 0;
+
+    VariableName *fn = SCMalloc(sizeof(VariableName));
+    if (unlikely(fn == NULL))
+        goto error;
+
+    memset(fn, 0, sizeof(VariableName));
+
+    fn->type = type;
+    fn->name = SCStrdup(name);
+    if (fn->name == NULL)
+        goto error;
+
+    VariableName *lookup_fn = (VariableName *)HashListTableLookup(de_ctx->variable_names, (void *)fn, 0);
+    if (lookup_fn == NULL) {
+        de_ctx->variable_names_idx++;
+
+        idx = fn->idx = de_ctx->variable_names_idx;
+        HashListTableAdd(de_ctx->variable_names, (void *)fn, 0);
+        HashListTableAdd(de_ctx->variable_idxs, (void *)fn, 0);
+    } else {
+        idx = lookup_fn->idx;
+        VariableNameFree(fn);
+    }
+
+    return idx;
+error:
+    VariableNameFree(fn);
+    return 0;
+}
+
+/** \brief Get a name from the idx.
+ *  \param idx index of the variable whose name is to be fetched
+ *  \param type variable type
+ *  \retval NULL in case of error
+ *  \retval name of the variable if successful.
+ */
+char *VariableIdxGetName(DetectEngineCtx *de_ctx, uint16_t idx, enum VarTypes type)
+{
+    VariableName *fn = SCMalloc(sizeof(VariableName));
+    if (unlikely(fn == NULL))
+        goto error;
+
+    char *name = NULL;
+    memset(fn, 0, sizeof(VariableName));
+
+    fn->type = type;
+    fn->idx = idx;
+
+    VariableName *lookup_fn = (VariableName *)HashListTableLookup(de_ctx->variable_idxs, (void *)fn, 0);
+    if (lookup_fn != NULL) {
+        name = SCStrdup(lookup_fn->name);
+        if (unlikely(name == NULL))
+            goto error;
+
+        VariableNameFree(fn);
+    } else {
+        goto error;
+    }
+
+    return name;
+error:
+    VariableNameFree(fn);
+    return NULL;
+}