Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 201 insertions, 0 deletions

diff --git a/epan/show_exception.c b/epan/show_exception.c
new file mode 100644
index 00000000..1ab395ce
--- /dev/null
+++ b/epan/show_exception.c
@@ -0,0 +1,201 @@
+/* show_exception.c
+ *
+ * Routines to put exception information into the protocol tree
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 2000 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+#define WS_LOG_DOMAIN LOG_DOMAIN_EPAN
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/exceptions.h>
+#include <epan/expert.h>
+#include <epan/prefs.h>
+#include <epan/prefs-int.h>
+#include <epan/show_exception.h>
+#include <wsutil/ws_assert.h>
+
+#include <wsutil/wslog.h>
+
+static int proto_short = -1;
+static int proto_malformed = -1;
+static int proto_unreassembled = -1;
+
+static expert_field ei_malformed_dissector_bug = EI_INIT;
+static expert_field ei_malformed_reassembly = EI_INIT;
+static expert_field ei_malformed = EI_INIT;
+static expert_field ei_unreassembled = EI_INIT;
+
+void
+register_show_exception(void)
+{
+	static ei_register_info ei[] = {
+		{ &ei_malformed_dissector_bug, { "_ws.malformed.dissector_bug", PI_MALFORMED, PI_ERROR, "Dissector bug", EXPFILL }},
+		{ &ei_malformed_reassembly, { "_ws.malformed.reassembly", PI_MALFORMED, PI_ERROR, "Reassembly error", EXPFILL }},
+		{ &ei_malformed, { "_ws.malformed.expert", PI_MALFORMED, PI_ERROR, "Malformed Packet (Exception occurred)", EXPFILL }},
+		{ &ei_unreassembled, { "_ws.unreassembled.expert", PI_REASSEMBLE, PI_NOTE, "Unreassembled fragment (change preferences to enable reassembly)", EXPFILL }},
+	};
+
+	expert_module_t* expert_malformed;
+
+	proto_short = proto_register_protocol("Short Frame", "Short frame", "_ws.short");
+	proto_malformed = proto_register_protocol("Malformed Packet",
+	    "Malformed packet", "_ws.malformed");
+	proto_unreassembled = proto_register_protocol(
+	    "Unreassembled Fragmented Packet",
+	    "Unreassembled fragmented packet", "_ws.unreassembled");
+
+	expert_malformed = expert_register_protocol(proto_malformed);
+	expert_register_field_array(expert_malformed, ei, array_length(ei));
+
+	/* "Short Frame", "Malformed Packet", and "Unreassembled Fragmented
+	   Packet" aren't really protocols, they're error indications;
+	   disabling them makes no sense. */
+	proto_set_cant_toggle(proto_short);
+	proto_set_cant_toggle(proto_malformed);
+	proto_set_cant_toggle(proto_unreassembled);
+}
+
+void
+show_exception(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
+	       unsigned long exception, const char *exception_message)
+{
+	static const char dissector_error_nomsg[] =
+		"Dissector writer didn't bother saying what the error was";
+	proto_item *item;
+
+	if ((exception == ReportedBoundsError || exception == ContainedBoundsError) && pinfo->fragmented)
+		exception = FragmentBoundsError;
+
+	switch (exception) {
+
+	case ScsiBoundsError:
+		col_append_str(pinfo->cinfo, COL_INFO, "[SCSI transfer limited due to allocation_length too small]");
+		proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0,
+				"SCSI transfer limited due to allocation_length too small: %s truncated]", pinfo->current_proto);
+		/* Don't record ScsiBoundsError exceptions as expert events - they merely
+		 * reflect a normal SCSI condition.
+		 * (any case where it's caused by something else is a bug). */
+		break;
+
+	case BoundsError:
+		{
+		gboolean display_info = TRUE;
+		module_t * frame_module = prefs_find_module("frame");
+		if (frame_module != NULL)
+		{
+			pref_t *display_pref = prefs_find_preference(frame_module, "disable_packet_size_limited_in_summary");
+			if (display_pref)
+			{
+				if (prefs_get_bool_value(display_pref, pref_current))
+					display_info = FALSE;
+			}
+		}
+
+		if (display_info)
+			col_append_str(pinfo->cinfo, COL_INFO, "[Packet size limited during capture]");
+		proto_tree_add_protocol_format(tree, proto_short, tvb, 0, 0,
+				"[Packet size limited during capture: %s truncated]", pinfo->current_proto);
+		/* Don't record BoundsError exceptions as expert events - they merely
+		 * reflect a capture done with a snapshot length too short to capture
+		 * all of the packet
+		 * (any case where it's caused by something else is a bug). */
+        }
+		break;
+
+	case FragmentBoundsError:
+		col_append_fstr(pinfo->cinfo, COL_INFO, "[BoundErrorUnreassembled Packet%s]", pinfo->noreassembly_reason);
+		item = proto_tree_add_protocol_format(tree, proto_unreassembled,
+		    tvb, 0, 0, "[BoundError Unreassembled Packet%s: %s]",
+		    pinfo->noreassembly_reason, pinfo->current_proto);
+		/* FragmentBoundsError merely reflect dissection done with
+		 * reassembly turned off, so add a note to that effect
+		 * (any case where it's caused by something else is a bug). */
+		expert_add_info(pinfo, item, &ei_unreassembled);
+		break;
+
+	case ContainedBoundsError:
+		col_append_fstr(pinfo->cinfo, COL_INFO, "[Malformed Packet: length of contained item exceeds length of containing item]");
+		item = proto_tree_add_protocol_format(tree, proto_malformed,
+		    tvb, 0, 0, "[Malformed Packet: %s: length of contained item exceeds length of containing item]",
+		    pinfo->current_proto);
+		expert_add_info(pinfo, item, &ei_malformed);
+		break;
+
+	case ReportedBoundsError:
+		show_reported_bounds_error(tvb, pinfo, tree);
+		break;
+
+	case DissectorError:
+		col_append_fstr(pinfo->cinfo, COL_INFO,
+		    "[Dissector bug, protocol %s: %s]",
+		    pinfo->current_proto,
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		item = proto_tree_add_protocol_format(tree, proto_malformed, tvb, 0, 0,
+		    "[Dissector bug, protocol %s: %s]",
+		    pinfo->current_proto,
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		ws_log(WS_LOG_DOMAIN, LOG_LEVEL_WARNING,
+		    "Dissector bug, protocol %s, in packet %u: %s",
+		    pinfo->current_proto, pinfo->num,
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		expert_add_info_format(pinfo, item, &ei_malformed_dissector_bug, "%s",
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		break;
+
+	case ReassemblyError:
+		col_append_fstr(pinfo->cinfo, COL_INFO,
+		    "[Reassembly error, protocol %s: %s]",
+		    pinfo->current_proto,
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		item = proto_tree_add_protocol_format(tree, proto_malformed, tvb, 0, 0,
+		    "[Reassembly error, protocol %s: %s]",
+		    pinfo->current_proto,
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		expert_add_info_format(pinfo, item, &ei_malformed_reassembly, "%s",
+		    exception_message == NULL ?
+		        dissector_error_nomsg : exception_message);
+		break;
+
+	default:
+		/* XXX - we want to know, if an unknown exception passed until here, don't we? */
+		ws_assert_not_reached();
+	}
+}
+
+void
+show_reported_bounds_error(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	proto_item *item;
+
+	col_append_str(pinfo->cinfo, COL_INFO,
+	    "[Malformed Packet]");
+	item = proto_tree_add_protocol_format(tree, proto_malformed,
+	    tvb, 0, 0, "[Malformed Packet: %s]", pinfo->current_proto);
+	expert_add_info(pinfo, item, &ei_malformed);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */