Get the "Decode As" dialog working, albeit with a few warts. It differs

from the GTK flavor in two major ways:

- The "Decode As" and "User Specified Decodes" dialog have been unified.
- You can modify the decode as behavior at any time, not just when you
  have a packet selected.

Revert part of 53498 so that we can move items marked

/*** THE FOLLOWING SHOULD NOT BE USED BY ANY DISSECTORS!!! ***/

from epan/decode_as.h to ui/decode_as_utils.h. 

Move "save" code from decode_as_dlg.c to decode_as_utils.c as well.

In packet-dcerpc.c don't register a table named "ethertype". We might
want to add checks for duplicate table names.

To do:
- Add support for ranges?
- Either add support for DCERPC or make DCERPC use a regular dissector
  table.
- Fix string selectors (i.e. BER).


svn path=/trunk/; revision=53910

1 files changed, 294 insertions, 0 deletions

diff --git a/ui/decode_as_utils.c b/ui/decode_as_utils.c
new file mode 100644
index 0000000000..d78c5d8dde
--- /dev/null
+++ b/ui/decode_as_utils.c
@@ -0,0 +1,294 @@
+/* decode_as_utils.c
+ *
+ * $Id$
+ *
+ * Routines to modify dissector tables on the fly.
+ *
+ * By David Hampton <dhampton@mac.com>
+ * Copyright 2001 David Hampton
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include "config.h"
+
+#include <stdlib.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+#include "epan/decode_as.h"
+#include "epan/packet.h"
+#include "epan/prefs.h"
+#include "epan/prefs-int.h"
+
+#include "epan/dissectors/packet-dcerpc.h"
+
+#include "ui/decode_as_utils.h"
+#include "ui/simple_dialog.h"
+
+#include "wsutil/file_util.h"
+#include "wsutil/filesystem.h"
+
+#include "version_info.h"
+
+/*
+ * A list of dissectors that need to be reset.
+ */
+static GSList *dissector_reset_list = NULL;
+
+/*
+ * Data structure used as user data when iterating dissector handles
+ */
+typedef struct lookup_entry {
+    gchar*             dissector_short_name;
+    dissector_handle_t handle;
+} lookup_entry_t;
+
+/*
+ * Data structure for tracking which dissector need to be reset.  This
+ * structure is necessary as a hash table entry cannot be removed
+ * while a g_hash_table_foreach walk is in progress.
+ */
+typedef struct dissector_delete_item {
+    /* The name of the dissector table */
+    const gchar *ddi_table_name;
+    /* The type of the selector in that dissector table */
+    ftenum_t ddi_selector_type;
+    /* The selector in the dissector table */
+    union {
+        guint   sel_uint;
+        char    *sel_string;
+    } ddi_selector;
+} dissector_delete_item_t;
+
+/*
+ * A callback function to changed a dissector_handle if matched
+ * This is used when iterating a dissector table
+ */
+static void
+change_dissector_if_matched(gpointer item, gpointer user_data)
+{
+    dissector_handle_t handle = (dissector_handle_t)item;
+    lookup_entry_t * lookup = (lookup_entry_t *)user_data;
+    if (strcmp(lookup->dissector_short_name, dissector_handle_get_short_name(handle)) == 0) {
+        lookup->handle = handle;
+    }
+}
+
+/*
+ * A callback function to parse each "decode as" entry in the file and apply the change
+ */
+static prefs_set_pref_e
+read_set_decode_as_entries(gchar *key, const gchar *value,
+			   void *user_data _U_,
+			   gboolean return_range_errors _U_)
+{
+    gchar *values[4] = {NULL, NULL, NULL, NULL};
+    gchar delimiter[4] = {',', ',', ',','\0'};
+    gchar *pch;
+    guint i, j;
+    dissector_table_t sub_dissectors;
+    prefs_set_pref_e retval = PREFS_SET_OK;
+    gboolean is_valid = FALSE;
+
+    if (strcmp(key, DECODE_AS_ENTRY) == 0) {
+        /* Parse csv into table, selector, initial, current */
+        for (i = 0; i < 4; i++) {
+            pch = strchr(value, delimiter[i]);
+            if (pch == NULL) {
+                for (j = 0; j < i; j++) {
+                    g_free(values[j]);
+                }
+                return PREFS_SET_SYNTAX_ERR;
+            }
+            values[i] = g_strndup(value, pch - value);
+            value = pch + 1;
+        }
+        sub_dissectors = find_dissector_table(values[0]);
+        if (sub_dissectors != NULL) {
+            lookup_entry_t lookup;
+            lookup.dissector_short_name = values[3];
+            lookup.handle = NULL;
+            ftenum_t selector_type = dissector_table_get_type(sub_dissectors);
+            g_slist_foreach(dissector_table_get_dissector_handles(sub_dissectors),
+                    change_dissector_if_matched, &lookup);
+            if (lookup.handle != NULL || g_ascii_strcasecmp(values[3], DECODE_AS_NONE) == 0) {
+                is_valid = TRUE;
+            }
+
+            if (is_valid) {
+                if (selector_type == FT_STRING || selector_type == FT_STRINGZ) {
+                    dissector_change_string(values[0], values[1], lookup.handle);
+                } else {
+                    dissector_change_uint(values[0], atoi(values[1]), lookup.handle);
+                }
+                decode_build_reset_list(g_strdup(values[0]), selector_type,
+                        g_strdup(values[1]), NULL, NULL);
+            }
+        } else {
+            retval = PREFS_SET_SYNTAX_ERR;
+        }
+
+    } else {
+        retval = PREFS_SET_NO_SUCH_PREF;
+    }
+
+    for (i = 0; i < 4; i++) {
+        g_free(values[i]);
+    }
+    return retval;
+}
+
+void
+load_decode_as_entries(void)
+{
+    char   *daf_path;
+    FILE   *daf;
+
+    if (dissector_reset_list) {
+        decode_clear_all();
+    }
+
+    daf_path = get_persconffile_path(DECODE_AS_ENTRIES_FILE_NAME, TRUE);
+    if ((daf = ws_fopen(daf_path, "r")) != NULL) {
+        read_prefs_file(daf_path, daf, read_set_decode_as_entries, NULL);
+        fclose(daf);
+    }
+    g_free(daf_path);
+}
+
+void
+decode_build_reset_list (const gchar *table_name, ftenum_t selector_type,
+                         gpointer key, gpointer value _U_,
+                         gpointer user_data _U_)
+{
+    dissector_delete_item_t *item;
+
+    item = g_new(dissector_delete_item_t,1);
+    item->ddi_table_name = table_name;
+    item->ddi_selector_type = selector_type;
+    switch (selector_type) {
+
+    case FT_UINT8:
+    case FT_UINT16:
+    case FT_UINT24:
+    case FT_UINT32:
+        item->ddi_selector.sel_uint = GPOINTER_TO_UINT(key);
+        break;
+
+    case FT_STRING:
+    case FT_STRINGZ:
+        item->ddi_selector.sel_string = (char *)key;
+        break;
+
+    default:
+        g_assert_not_reached();
+    }
+    dissector_reset_list = g_slist_prepend(dissector_reset_list, item);
+}
+
+/* clear all settings */
+void
+decode_clear_all(void)
+{
+    dissector_delete_item_t *item;
+    GSList *tmp;
+
+    dissector_all_tables_foreach_changed(decode_build_reset_list, NULL);
+
+    for (tmp = dissector_reset_list; tmp; tmp = g_slist_next(tmp)) {
+        item = (dissector_delete_item_t *)tmp->data;
+        switch (item->ddi_selector_type) {
+
+        case FT_UINT8:
+        case FT_UINT16:
+        case FT_UINT24:
+        case FT_UINT32:
+            dissector_reset_uint(item->ddi_table_name,
+                                 item->ddi_selector.sel_uint);
+            break;
+
+        case FT_STRING:
+        case FT_STRINGZ:
+            dissector_reset_string(item->ddi_table_name,
+                                   item->ddi_selector.sel_string);
+            break;
+
+        default:
+            g_assert_not_reached();
+        }
+        g_free(item);
+    }
+    g_slist_free(dissector_reset_list);
+    dissector_reset_list = NULL;
+
+    decode_dcerpc_reset_all();
+}
+
+/* XXX - We might want to switch this to a UAT */
+FILE *
+decode_as_open() {
+    char *pf_dir_path;
+    char *daf_path;
+    FILE *da_file;
+    
+    if (create_persconffile_dir(&pf_dir_path) == -1) {
+        simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+                "Can't create directory\n\"%s\"\nfor recent file: %s.", pf_dir_path,
+                g_strerror(errno));
+        g_free(pf_dir_path);
+        return NULL;
+    }
+
+    daf_path = get_persconffile_path(DECODE_AS_ENTRIES_FILE_NAME, TRUE);
+    if ((da_file = ws_fopen(daf_path, "w")) == NULL) {
+        simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+            "Can't open decode_as_entries file\n\"%s\": %s.", daf_path,
+            g_strerror(errno));
+        g_free(daf_path);
+        return NULL;
+    }
+
+    fputs("# \"Decode As\" entries file for Wireshark " VERSION ".\n"
+        "#\n"
+        "# This file is regenerated each time \"Decode As\" preferences\n"
+        "# are saved within Wireshark. Making manual changes should be safe,"
+        "# however.\n", da_file);
+
+    return da_file;
+}
+
+/* XXX We might want to have separate int and string routines. */
+void
+decode_as_write_entry(FILE *da_file, const char *table_name, const char *selector, const char *default_proto, const char *current_proto) {
+    fprintf (da_file,
+             DECODE_AS_ENTRY ": %s,%s,%s,%s\n",
+             table_name, selector, default_proto, current_proto);
+}
+
+
+/*
+ * Editor modelines
+ *
+ * Local Variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
+