[Oisf-devel] small pb (FN) on suricata with content and offset+depth

[rmkml]

Hi,
I have a small pb with this sig and joigned (dns/udp) pcap file without alert firing:
  alert udp any 53 -> any any (msg:"suricata test dns reply"; content:"|00 00 00|"; offset:3; depth:4; classtype:bad-unknown; sid:9199437; rev:1;)
simplified tcpdump hex output (on joigned pcap file):
  0x0000:  4500 0028 0000 4000 3411 5152 c202 2809
  0x0010:  0a32 0136 0035 e6e6 0014 1a16 6098 a888
  0x0020:  0000 0000 0000 0000 0000 0000 0000
ok udp payload start at 0x1c, on my sig, offset:3 start at 0x1f, but depth:4 allow me 0x1f:88 + 0x20:00 + 0x21: 00 + 0x22:00.
Anyone confirm this small pb please?
Tested on suricata v0.9.0 and git on date 20 may 2010 (b629b7c5c1e2ad6c91b97b6708ad9ddc6a674502).

and of course, this sig work:
  alert udp any 53 -> any any (msg:"suricata test dns reply"; content:"|00 00 00|"; offset:4; depth:3; classtype:bad-unknown; sid:9199437; rev:1;)
Regards
Rmkml
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