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tcp_dissect_pdus warning message

asked 2019-09-23 17:32:55 +0000

Kim gravatar image

updated 2019-09-23 18:50:44 +0000

Guy Harris gravatar image

Warning message: passing argument 6 of 'tcp_dissect_pdus' from incompatible pointer type [enabled by default]

static int dissect_foo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *ptr)
  length = tvb_captured_length(tvb);
  tcp_dissect_pdus(tvb, pinfo, tree, TRUE, FRAME_HEADER_LEN, get_foo_message_len, dissect_foo_message, ptr); 
  return length;
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answered 2019-09-23 18:56:14 +0000

Guy Harris gravatar image

updated 2019-10-08 15:03:46 +0000

grahamb gravatar image

"Argument 6" is the pointer to the "get PDU length" routine.

The "get PDU length" routine MUST be a routine that is passed:

  • a packet_info * passed to the dissector that's calling tcp_dissect_pdu();
  • a tvbuff_t * pointing to the tvbuff containing the TCP data;
  • an int whose value is the offset in that tvbuff at which that PDU begins;
  • a void * that's the dissector data pointer passed to the dissector that's calling tcp_dissect_pdu();

and that returns the total length of the PDU, in bytes.

If that's not what your "get PDU length" routine does, you MUST change it to do so.

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Asked: 2019-09-23 17:32:55 +0000

Seen: 196 times

Last updated: Oct 08 '19