1 files changed, 108 insertions, 0 deletions
diff --git a/wiretap/json.c b/wiretap/json.c
new file mode 100644
index 00000000..e2213e95
--- /dev/null
+++ b/wiretap/json.c
@@ -0,0 +1,108 @@
+/* json.c
+ *
+ * Copyright 2015, Dario Lombardo <lomato@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include "wtap-int.h"
+#include "file_wrappers.h"
+
+#include "json.h"
+#include <wsutil/wsjson.h>
+
+/* Maximum size of json file. */
+#define MAX_FILE_SIZE  (50*1024*1024)
+
+static int json_file_type_subtype = -1;
+
+void register_json(void);
+
+wtap_open_return_val json_open(wtap *wth, int *err, gchar **err_info)
+{
+    guint8* filebuf;
+    int bytes_read;
+
+    /* XXX checking the full file contents might be a bit expensive, maybe
+     * resort to simpler heuristics like '{' or '[' (with some other chars)? */
+    filebuf = (guint8*)g_malloc0(MAX_FILE_SIZE);
+    if (!filebuf)
+        return WTAP_OPEN_ERROR;
+
+    bytes_read = file_read(filebuf, MAX_FILE_SIZE, wth->fh);
+    if (bytes_read < 0) {
+        /* Read error. */
+        *err = file_error(wth->fh, err_info);
+        g_free(filebuf);
+        return WTAP_OPEN_ERROR;
+    }
+    if (bytes_read == 0) {
+        /* empty file, not *anybody's* */
+        g_free(filebuf);
+        return WTAP_OPEN_NOT_MINE;
+    }
+
+    if (json_validate(filebuf, bytes_read) == FALSE) {
+        g_free(filebuf);
+        return WTAP_OPEN_NOT_MINE;
+    }
+
+    if (file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
+        g_free(filebuf);
+        return WTAP_OPEN_ERROR;
+    }
+
+    wth->file_type_subtype = json_file_type_subtype;
+    wth->file_encap = WTAP_ENCAP_JSON;
+    wth->file_tsprec = WTAP_TSPREC_SEC;
+    wth->subtype_read = wtap_full_file_read;
+    wth->subtype_seek_read = wtap_full_file_seek_read;
+    wth->snapshot_length = 0;
+
+    g_free(filebuf);
+    return WTAP_OPEN_MINE;
+}
+
+static const struct supported_block_type json_blocks_supported[] = {
+    /*
+     * This is a file format that we dissect, so we provide only one
+     * "packet" with the file's contents, and don't support any
+     * options.
+     */
+    { WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
+};
+
+static const struct file_type_subtype_info json_info = {
+    "JavaScript Object Notation", "json", "json", NULL,
+    FALSE, BLOCKS_SUPPORTED(json_blocks_supported),
+    NULL, NULL, NULL
+};
+
+void register_json(void)
+{
+    json_file_type_subtype = wtap_register_file_type_subtype(&json_info);
+
+    /*
+     * Register name for backwards compatibility with the
+     * wtap_filetypes table in Lua.
+     */
+    wtap_register_backwards_compatibility_lua_name("JSON",
+                                                   json_file_type_subtype);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */