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-rw-r--r--exceptions.h15
-rw-r--r--packet-atm.c6
-rw-r--r--packet-eth.c10
-rw-r--r--packet-fddi.c4
-rw-r--r--packet-isl.c4
-rw-r--r--packet-llc.c6
-rw-r--r--packet-tr.c6
-rw-r--r--packet-vlan.c4
-rw-r--r--packet.c15
-rw-r--r--tvbuff.c83
-rw-r--r--tvbuff.h10
11 files changed, 107 insertions, 56 deletions
diff --git a/exceptions.h b/exceptions.h
index 07de983f4d..4fa1c53960 100644
--- a/exceptions.h
+++ b/exceptions.h
@@ -10,6 +10,7 @@
/* Ethereal's exceptions */
#define BoundsError 1 /* Index is out of range */
+#define ReportedBoundsError 2 /* Index is beyond reported length (not cap_len) */
/* Usage:
*
@@ -21,6 +22,10 @@
* code;
* }
*
+ * CATCH2(exception1, exception2) {
+ * code;
+ * }
+ *
* CATCH_ALL {
* code;
* }
@@ -48,6 +53,9 @@
* else if (x == 2) {
* <CATCH(2) code>
* }
+ * else if (x == 3 || x == 4) {
+ * <CATCH2(3,4) code>
+ * }
* else {
* <CATCH_ALL code> {
* }
@@ -84,7 +92,6 @@
#define TRY \
{\
except_t *exc; \
- int caught = 0; \
static const except_id_t catch_spec[] = { \
{ XCEPT_GROUP_ETHEREAL, XCEPT_CODE_ANY } }; \
except_try_push(catch_spec, 1, &exc); \
@@ -99,14 +106,16 @@
#define CATCH(x) \
} \
else if (exc->except_id.except_code == (x)) { \
- caught = 1;
/* user's code goes here */
+#define CATCH2(x,y) \
+ } \
+ else if (exc->except_id.except_code == (x) || exc->except_id.except_code == (y)) { \
+ /* user's code goes here */
#define CATCH_ALL \
} \
else { \
- caught = 1;
/* user's code goes here */
#define FINALLY \
diff --git a/packet-atm.c b/packet-atm.c
index 658b0e3112..52faabfa6b 100644
--- a/packet-atm.c
+++ b/packet-atm.c
@@ -1,7 +1,7 @@
/* packet-atm.c
* Routines for ATM packet disassembly
*
- * $Id: packet-atm.c,v 1.16 2000/05/15 06:22:05 gram Exp $
+ * $Id: packet-atm.c,v 1.17 2000/05/16 04:44:10 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -375,7 +375,7 @@ dissect_lane(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
tvbuff_t *next_tvb;
- next_tvb = tvb_new_subset(pi.compat_top_tvb, offset, -1);
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, offset, -1, -1);
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "ATM LANE");
@@ -717,7 +717,7 @@ dissect_atm(const u_char *pd, frame_data *fd, proto_tree *tree)
/* Dissect as WTAP_ENCAP_ATM_RFC1483 */
/* The ATM iptrace capture that we have hows LLC at this point,
* so that's what I'm calling */
- next_tvb = tvb_new_subset(pi.compat_top_tvb, offset, -1);
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, offset, -1, -1);
dissect_llc(next_tvb, &pi, tree);
break;
diff --git a/packet-eth.c b/packet-eth.c
index 54e91271b8..fbe02aa878 100644
--- a/packet-eth.c
+++ b/packet-eth.c
@@ -1,7 +1,7 @@
/* packet-eth.c
* Routines for ethernet packet disassembly
*
- * $Id: packet-eth.c,v 1.36 2000/05/15 06:22:05 gram Exp $
+ * $Id: packet-eth.c,v 1.37 2000/05/16 04:44:11 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -251,15 +251,15 @@ dissect_eth(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
/* Give the next dissector only 'length' number of bytes */
if (etype <= IEEE_802_3_MAX_LEN) {
TRY {
- next_tvb = tvb_new_subset(pi.compat_top_tvb, eth_offset, etype);
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, eth_offset, etype, etype);
}
- CATCH(BoundsError) {
- next_tvb = tvb_new_subset(pi.compat_top_tvb, eth_offset, -1);
+ CATCH2(BoundsError, ReportedBoundsError) {
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, eth_offset, -1, etype);
}
ENDTRY;
}
else {
- next_tvb = tvb_new_subset(pi.compat_top_tvb, eth_offset, -1);
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, eth_offset, -1, -1);
}
switch (ethhdr_type) {
diff --git a/packet-fddi.c b/packet-fddi.c
index 4268a8c37a..12e57741ea 100644
--- a/packet-fddi.c
+++ b/packet-fddi.c
@@ -3,7 +3,7 @@
*
* Laurent Deniel <deniel@worldnet.fr>
*
- * $Id: packet-fddi.c,v 1.32 2000/05/11 22:04:16 gram Exp $
+ * $Id: packet-fddi.c,v 1.33 2000/05/16 04:44:11 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -313,7 +313,7 @@ dissect_fddi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
}
- next_tvb = tvb_new_subset(tvb, FDDI_HEADER_SIZE, -1);
+ next_tvb = tvb_new_subset(tvb, FDDI_HEADER_SIZE, -1, -1);
switch (fc) {
diff --git a/packet-isl.c b/packet-isl.c
index 9bd1fa5dd1..55c679e0e5 100644
--- a/packet-isl.c
+++ b/packet-isl.c
@@ -1,7 +1,7 @@
/* packet-isl.c
* Routines for Cisco ISL Ethernet header disassembly
*
- * $Id: packet-isl.c,v 1.9 2000/05/15 06:22:06 gram Exp $
+ * $Id: packet-isl.c,v 1.10 2000/05/16 04:44:11 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -225,7 +225,7 @@ dissect_isl(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
pd[offset+30]);
proto_tree_add_item(fh_tree, hf_isl_esize, NullTVB, offset+16, 1,
pd[offset+30]);
- next_tvb = tvb_new_subset(pi.compat_top_tvb, offset+31, -1);
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, offset+31, -1, -1);
dissect_tr(next_tvb, &pi, tree);
break;
diff --git a/packet-llc.c b/packet-llc.c
index a9bac08fd0..daf391eb4c 100644
--- a/packet-llc.c
+++ b/packet-llc.c
@@ -2,7 +2,7 @@
* Routines for IEEE 802.2 LLC layer
* Gilbert Ramirez <gram@xiexie.org>
*
- * $Id: packet-llc.c,v 1.59 2000/05/12 05:06:26 gram Exp $
+ * $Id: packet-llc.c,v 1.60 2000/05/16 04:44:12 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -342,7 +342,7 @@ dissect_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
oui);
}
- next_tvb = tvb_new_subset(tvb, 8, -1);
+ next_tvb = tvb_new_subset(tvb, 8, -1, -1);
tvb_compat(next_tvb, &pd, &offset);
switch (oui) {
@@ -432,7 +432,7 @@ dissect_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
);
}
- next_tvb = tvb_new_subset(tvb, llc_header_len, -1);
+ next_tvb = tvb_new_subset(tvb, llc_header_len, -1, -1);
if (XDLC_IS_INFORMATION(control)) {
tvb_compat(tvb, &pd, &offset);
/* non-SNAP */
diff --git a/packet-tr.c b/packet-tr.c
index a162647e11..afcce25d43 100644
--- a/packet-tr.c
+++ b/packet-tr.c
@@ -2,7 +2,7 @@
* Routines for Token-Ring packet disassembly
* Gilbert Ramirez <gram@xiexie.org>
*
- * $Id: packet-tr.c,v 1.40 2000/05/15 06:22:06 gram Exp $
+ * $Id: packet-tr.c,v 1.41 2000/05/16 04:44:12 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -336,7 +336,7 @@ dissect_tr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
if ((x = check_for_old_linux_tvb((tvbuff_t*) tvb))) {
/* Actually packet starts x bytes into what we have got but with all
source routing compressed. See comment above */
- tr_tvb = tvb_new_subset((tvbuff_t*) tvb, x, -1);
+ tr_tvb = tvb_new_subset((tvbuff_t*) tvb, x, -1, -1);
}
else {
tr_tvb = tvb;
@@ -518,7 +518,7 @@ dissect_tr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
- next_tvb = tvb_new_subset(tr_tvb, TR_MIN_HEADER_LEN + actual_rif_bytes + fixoffset, -1);
+ next_tvb = tvb_new_subset(tr_tvb, TR_MIN_HEADER_LEN + actual_rif_bytes + fixoffset, -1, -1);
tvb_compat(next_tvb, &next_pd, &next_offset);
/* The package is either MAC or LLC */
diff --git a/packet-vlan.c b/packet-vlan.c
index d747a855b4..67a4692f4b 100644
--- a/packet-vlan.c
+++ b/packet-vlan.c
@@ -1,7 +1,7 @@
/* packet-vlan.c
* Routines for VLAN 802.1Q ethernet header disassembly
*
- * $Id: packet-vlan.c,v 1.12 2000/05/11 22:04:17 gram Exp $
+ * $Id: packet-vlan.c,v 1.13 2000/05/16 04:44:13 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -98,7 +98,7 @@ dissect_vlan(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree_add_item(vlan_tree, hf_vlan_id, NullTVB, offset, 2, tci);
}
- next_tvb = tvb_new_subset(pi.compat_top_tvb, offset+4, -1);
+ next_tvb = tvb_new_subset(pi.compat_top_tvb, offset+4, -1, -1); /* XXX - like dissect_eth() */
if ( encap_proto <= IEEE_802_3_MAX_LEN) {
if ( pd[offset+4] == 0xff && pd[offset+5] == 0xff ) {
dissect_ipx(pd,offset+4,fd,tree);
diff --git a/packet.c b/packet.c
index 3a92ff7fe4..98d4064f0e 100644
--- a/packet.c
+++ b/packet.c
@@ -1,7 +1,7 @@
/* packet.c
* Routines for packet disassembly
*
- * $Id: packet.c,v 1.82 2000/05/15 06:22:07 gram Exp $
+ * $Id: packet.c,v 1.83 2000/05/16 04:44:13 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -104,6 +104,8 @@ static int hf_frame_time_delta = -1;
static int hf_frame_number = -1;
static int hf_frame_packet_len = -1;
static int hf_frame_capture_len = -1;
+static int proto_short = -1;
+static int proto_malformed = -1;
static gint ett_frame = -1;
@@ -1165,7 +1167,7 @@ dissect_packet(const u_char *pd, frame_data *fd, proto_tree *tree)
pi.len = fd->pkt_len;
pi.captured_len = fd->cap_len;
- tvb = tvb_new_real_data(pd, fd->cap_len);
+ tvb = tvb_new_real_data(pd, fd->cap_len, -1);
pi.fd = fd;
pi.compat_top_tvb = tvb;
@@ -1214,7 +1216,12 @@ dissect_packet(const u_char *pd, frame_data *fd, proto_tree *tree)
}
}
CATCH(BoundsError) {
- proto_tree_add_text(tree, NullTVB, 0, 0, "[Short Frame: %s]", pi.current_proto );
+ proto_tree_add_protocol_format(tree, proto_short, NullTVB, 0, 0,
+ "[Short Frame: %s]", pi.current_proto );
+ }
+ CATCH(ReportedBoundsError) {
+ proto_tree_add_protocol_format(tree, proto_malformed, NullTVB, 0, 0,
+ "[Malformed Frame: %s]", pi.current_proto );
}
ENDTRY;
@@ -1313,6 +1320,8 @@ proto_register_frame(void)
proto_register_field_array(proto_frame, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
+ proto_short = proto_register_protocol("Short Frame", "short");
+ proto_malformed = proto_register_protocol("Malformed Frame", "malformed");
register_init_routine(&packet_init_protocol);
}
diff --git a/tvbuff.c b/tvbuff.c
index e2ed4db385..bb52c55308 100644
--- a/tvbuff.c
+++ b/tvbuff.c
@@ -9,7 +9,7 @@
* the data of a backing tvbuff, or can be a composite of
* other tvbuffs.
*
- * $Id: tvbuff.c,v 1.2 2000/05/15 04:37:27 gram Exp $
+ * $Id: tvbuff.c,v 1.3 2000/05/16 04:44:14 gram Exp $
*
* Copyright (c) 2000 by Gilbert Ramirez <gram@xiexie.org>
*
@@ -121,6 +121,9 @@ struct tvbuff {
/* Length of virtual buffer (and/or real_data). */
guint length;
+ /* Reported length. */
+ gint reported_length;
+
/* Offset from beginning of first TVBUFF_REAL. */
gint raw_offset;
@@ -163,6 +166,7 @@ tvb_init(tvbuff_t *tvb, tvbuff_type type)
tvb->initialized = FALSE;
tvb->usage_count = 1;
tvb->length = 0;
+ tvb->reported_length = 0;
tvb->free_cb = NULL;
tvb->real_data = NULL;
tvb->raw_offset = -1;
@@ -298,23 +302,25 @@ tvb_set_free_cb(tvbuff_t* tvb, tvbuff_free_cb_t func)
}
void
-tvb_set_real_data(tvbuff_t* tvb, const guint8* data, guint length)
+tvb_set_real_data(tvbuff_t* tvb, const guint8* data, guint length, gint reported_length)
{
g_assert(tvb->type == TVBUFF_REAL_DATA);
g_assert(!tvb->initialized);
+ g_assert(reported_length >= -1);
- tvb->real_data = (gpointer) data;
- tvb->length = length;
- tvb->initialized = TRUE;
+ tvb->real_data = (gpointer) data;
+ tvb->length = length;
+ tvb->reported_length = reported_length;
+ tvb->initialized = TRUE;
}
tvbuff_t*
-tvb_new_real_data(const guint8* data, guint length)
+tvb_new_real_data(const guint8* data, guint length, gint reported_length)
{
tvbuff_t *tvb;
tvb = tvb_new(TVBUFF_REAL_DATA);
- tvb_set_real_data(tvb, data, length);
+ tvb_set_real_data(tvb, data, length, reported_length);
return tvb;
}
@@ -326,7 +332,7 @@ tvb_new_real_data(const guint8* data, guint length)
* No exception is thrown. */
static gboolean
compute_offset_length(tvbuff_t *tvb, gint offset, gint length,
- guint *offset_ptr, guint *length_ptr)
+ guint *offset_ptr, guint *length_ptr, int *exception)
{
g_assert(offset_ptr);
g_assert(length_ptr);
@@ -335,7 +341,16 @@ compute_offset_length(tvbuff_t *tvb, gint offset, gint length,
if (offset >= 0) {
*offset_ptr = offset;
}
+ else if ((tvb->reported_length > -1) && -offset > tvb->reported_length) {
+ if (exception) {
+ *exception = ReportedBoundsError;
+ }
+ return FALSE;
+ }
else if (-offset > tvb->length) {
+ if (exception) {
+ *exception = BoundsError;
+ }
return FALSE;
}
else {
@@ -357,18 +372,33 @@ compute_offset_length(tvbuff_t *tvb, gint offset, gint length,
static gboolean
check_offset_length_no_exception(tvbuff_t *tvb, gint offset, gint length,
- guint *offset_ptr, guint *length_ptr)
+ guint *offset_ptr, guint *length_ptr, int *exception)
{
g_assert(tvb->initialized);
- if (!compute_offset_length(tvb, offset, length, offset_ptr, length_ptr)) {
+ if (!compute_offset_length(tvb, offset, length, offset_ptr, length_ptr, exception)) {
return FALSE;
}
if (*offset_ptr + *length_ptr <= tvb->length) {
return TRUE;
}
+ else if (tvb->reported_length == -1) {
+ if (exception) {
+ *exception = BoundsError;
+ }
+ return FALSE;
+ }
+ else if (*offset_ptr + *length_ptr <= tvb->reported_length) {
+ if (exception) {
+ *exception = BoundsError;
+ }
+ return FALSE;
+ }
else {
+ if (exception) {
+ *exception = ReportedBoundsError;
+ }
return FALSE;
}
@@ -382,8 +412,11 @@ static void
check_offset_length(tvbuff_t *tvb, gint offset, gint length,
guint *offset_ptr, guint *length_ptr)
{
- if (!check_offset_length_no_exception(tvb, offset, length, offset_ptr, length_ptr)) {
- THROW(BoundsError);
+ int exception = 0;
+
+ if (!check_offset_length_no_exception(tvb, offset, length, offset_ptr, length_ptr, &exception)) {
+ g_assert(exception > 0);
+ THROW(exception);
}
return;
}
@@ -396,7 +429,7 @@ add_to_used_in_list(tvbuff_t *tvb, tvbuff_t *used_in)
void
tvb_set_subset(tvbuff_t *tvb, tvbuff_t *backing,
- gint backing_offset, gint backing_length)
+ gint backing_offset, gint backing_length, gint reported_length)
{
g_assert(tvb->type == TVBUFF_SUBSET);
g_assert(!tvb->initialized);
@@ -406,9 +439,10 @@ tvb_set_subset(tvbuff_t *tvb, tvbuff_t *backing,
&tvb->tvbuffs.subset.length);
tvb_increment_usage_count(backing, 1);
- tvb->tvbuffs.subset.tvb = backing;
- tvb->length = tvb->tvbuffs.subset.length;
- tvb->initialized = TRUE;
+ tvb->tvbuffs.subset.tvb = backing;
+ tvb->length = tvb->tvbuffs.subset.length;
+ tvb->reported_length = reported_length;
+ tvb->initialized = TRUE;
add_to_used_in_list(backing, tvb);
/* Optimization. If the backing buffer has a pointer to contiguous, real data,
@@ -420,12 +454,12 @@ tvb_set_subset(tvbuff_t *tvb, tvbuff_t *backing,
tvbuff_t*
-tvb_new_subset(tvbuff_t *backing, gint backing_offset, gint backing_length)
+tvb_new_subset(tvbuff_t *backing, gint backing_offset, gint backing_length, gint reported_length)
{
tvbuff_t *tvb;
tvb = tvb_new(TVBUFF_SUBSET);
- tvb_set_subset(tvb, backing, backing_offset, backing_length);
+ tvb_set_subset(tvb, backing, backing_offset, backing_length, reported_length);
return tvb;
}
@@ -503,8 +537,7 @@ tvb_length_remaining(tvbuff_t *tvb, gint offset)
g_assert(tvb->initialized);
- if (compute_offset_length(tvb, offset, -1,
- &abs_offset, &abs_length)) {
+ if (compute_offset_length(tvb, offset, -1, &abs_offset, &abs_length, NULL)) {
return abs_length;
}
else {
@@ -523,7 +556,7 @@ tvb_bytes_exist(tvbuff_t *tvb, gint offset, gint length)
g_assert(tvb->initialized);
- if (!compute_offset_length(tvb, offset, length, &abs_offset, &abs_length))
+ if (!compute_offset_length(tvb, offset, length, &abs_offset, &abs_length, NULL))
return FALSE;
if (abs_offset + abs_length <= tvb->length) {
@@ -540,7 +573,7 @@ tvb_offset_exists(tvbuff_t *tvb, gint offset)
guint abs_offset, abs_length;
g_assert(tvb->initialized);
- if (compute_offset_length(tvb, offset, -1, &abs_offset, &abs_length)) {
+ if (compute_offset_length(tvb, offset, -1, &abs_offset, &abs_length, NULL)) {
return TRUE;
}
else {
@@ -635,7 +668,7 @@ composite_ensure_contiguous(tvbuff_t *tvb, guint abs_offset, guint abs_length)
g_assert(member_tvb);
if (check_offset_length_no_exception(member_tvb, abs_offset - composite->start_offsets[i],
- abs_length, &member_offset, &member_length)) {
+ abs_length, &member_offset, &member_length, NULL)) {
g_assert(!tvb->real_data);
return ensure_contiguous(member_tvb, member_offset, member_length);
@@ -706,7 +739,7 @@ composite_memcpy(tvbuff_t *tvb, guint8* target, guint abs_offset, guint abs_leng
g_assert(member_tvb);
if (check_offset_length_no_exception(member_tvb, abs_offset - composite->start_offsets[i],
- abs_length, &member_offset, &member_length)) {
+ abs_length, &member_offset, &member_length, NULL)) {
g_assert(!tvb->real_data);
return tvb_memcpy(member_tvb, target, member_offset, member_length);
@@ -718,7 +751,7 @@ composite_memcpy(tvbuff_t *tvb, guint8* target, guint abs_offset, guint abs_leng
* until we have copied all data.
*/
retval = compute_offset_length(member_tvb, abs_offset - composite->start_offsets[i], -1,
- &member_offset, &member_length);
+ &member_offset, &member_length, NULL);
g_assert(retval);
tvb_memcpy(member_tvb, target, member_offset, member_length);
diff --git a/tvbuff.h b/tvbuff.h
index 97fe4e3391..481200a122 100644
--- a/tvbuff.h
+++ b/tvbuff.h
@@ -9,7 +9,7 @@
* the data of a backing tvbuff, or can be a composite of
* other tvbuffs.
*
- * $Id: tvbuff.h,v 1.2 2000/05/15 04:37:27 gram Exp $
+ * $Id: tvbuff.h,v 1.3 2000/05/16 04:44:14 gram Exp $
*
* Copyright (c) 2000 by Gilbert Ramirez <gram@xiexie.org>
*
@@ -119,10 +119,10 @@ void tvb_set_free_cb(tvbuff_t*, tvbuff_free_cb_t);
/* Sets parameters for TVBUFF_REAL_DATA */
-void tvb_set_real_data(tvbuff_t*, const guint8* data, guint length);
+void tvb_set_real_data(tvbuff_t*, const guint8* data, guint length, gint reported_length);
/* Combination of tvb_new() and tvb_set_real_data() */
-tvbuff_t* tvb_new_real_data(const guint8* data, guint length);
+tvbuff_t* tvb_new_real_data(const guint8* data, guint length, gint reported_length);
/* Define the subset of the backing buffer to use.
@@ -138,11 +138,11 @@ tvbuff_t* tvb_new_real_data(const guint8* data, guint length);
* Will throw BoundsError if 'backing_offset'/'length'
* is beyond the bounds of the backing tvbuff. */
void tvb_set_subset(tvbuff_t* tvb, tvbuff_t* backing,
- gint backing_offset, gint backing_length);
+ gint backing_offset, gint backing_length, gint reported_length);
/* Combination of tvb_new() and tvb_set_subset() */
tvbuff_t* tvb_new_subset(tvbuff_t* backing,
- gint backing_offset, gint backing_length);
+ gint backing_offset, gint backing_length, gint reported_length);
/* Both tvb_composite_append and tvb_composite_prepend can throw
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-13 01:05:19 +0000