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pcapparse: Fail on unknown version or linktype

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The element only knows about major version 2 and only decodes linktype ethernet
This commit is contained in:
Olivier Crête 2010-11-03 18:23:27 -04:00
parent ec16c22f54
commit 16ec12371a
1 changed files with 30 additions and 9 deletions
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39
gst/pcapparse/gstpcapparse.c
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@ -468,7 +468,9 @@ gst_pcap_parse_chain (GstPad * pad, GstBuffer * buffer)
self->cur_packet_size = incl_len;
}
} else {
guint magic;
guint32 magic;
guint32 linktype;
guint16 major_version;
if (avail < 24)
break;
@ -476,24 +478,43 @@ gst_pcap_parse_chain (GstPad * pad, GstBuffer * buffer)
data = gst_adapter_peek (self->adapter, 24);
magic = *((guint32 *) data);
major_version = *((guint16 *) (data + 4));
gst_adapter_flush (self->adapter, 24);
if (magic == 0xa1b2c3d4)
if (magic == 0xa1b2c3d4) {
self->swap_endian = FALSE;
else if (magic == 0xd4c3b2a1)
} else if (magic == 0xd4c3b2a1) {
self->swap_endian = TRUE;
else {
major_version = major_version << 8 | major_version >> 8;
} else {
GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE, (NULL),
("File is not a libpcap file version 2, magic is %X", magic));
("File is not a libpcap file, magic is %X", magic));
ret = GST_FLOW_ERROR;
goto out;
}
if (ret == GST_FLOW_OK)
self->initialized = TRUE;
if (major_version != 2) {
GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE, (NULL),
("File is not a libpcap major version 2, but %u", major_version));
ret = GST_FLOW_ERROR;
goto out;
}
linktype = gst_pcap_parse_read_uint32 (self, data + 20);
if (linktype != 1) {
GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE, (NULL),
("Only Ethernet packets of type 1 understood,"
" type %d unknown", linktype));
ret = GST_FLOW_ERROR;
goto out;
}
gst_adapter_flush (self->adapter, 24);
self->initialized = TRUE;
}
}
out:
if (ret != GST_FLOW_OK)
gst_pcap_parse_reset (self);