diff options
author | Richard van der Hoff <richardv@mxtelecom.com> | 2007-08-24 13:08:21 +0000 |
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committer | Richard van der Hoff <richardv@mxtelecom.com> | 2007-08-24 13:08:21 +0000 |
commit | a312d7833c6a0417f1272dd701d94a47873f32ae (patch) | |
tree | bdf516fb620959e8da7e102a8227320993a385cb /epan/dissectors/packet-srp.c | |
parent | 70af350b8bf9628f808d9f0e7ee794d9ebddbdfe (diff) |
move packet-srp into the core (from the h223 plugin)
svn path=/trunk/; revision=22634
Diffstat (limited to 'epan/dissectors/packet-srp.c')
-rw-r--r-- | epan/dissectors/packet-srp.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/epan/dissectors/packet-srp.c b/epan/dissectors/packet-srp.c new file mode 100644 index 0000000000..5c51873412 --- /dev/null +++ b/epan/dissectors/packet-srp.c @@ -0,0 +1,240 @@ +/* packet-srp.c + * Routines for H.324/SRP dissection + * 2004 Richard van der Hoff <richardv@mxtelecom.com> + * + * $Id$ + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <gmodule.h> +#include <glib.h> +#include <epan/bitswap.h> +#include <epan/circuit.h> +#include <epan/packet.h> +#include <epan/stream.h> +#include <epan/reassemble.h> +#include <epan/crc16.h> + +/* Wireshark ID of the protocols */ +static int proto_srp = -1; +static int proto_ccsrl = -1; + +/* The following hf_* variables are used to hold the Wireshark IDs of + * our header fields; they are filled out when we call + * proto_register_field_array() in proto_register_srp() + */ +static int hf_srp_header = -1; +static int hf_srp_seqno = -1; +static int hf_srp_crc = -1; +static int hf_srp_crc_bad = -1; +static int hf_ccsrl_ls = -1; + +/* These are the ids of the subtrees that we may be creating */ +static gint ett_srp = -1; +static gint ett_ccsrl = -1; + +static dissector_handle_t data_handle=NULL; +static dissector_handle_t ccsrl_handle=NULL; +static dissector_handle_t h245dg_handle=NULL; + +/*****************************************************************************/ +#define SRP_SRP_COMMAND 249 +#define SRP_SRP_RESPONSE 251 +#define SRP_NSRP_RESPONSE 247 + +static const value_string srp_frame_types[] = { + {SRP_SRP_COMMAND, "SRP command"}, + {SRP_SRP_RESPONSE, "SRP response"}, + {SRP_NSRP_RESPONSE, "NSRP response"}, + {0,NULL} +}; + +static const value_string ccsrl_ls_vals[] = { + {0xFF, "Yes"}, + {0x00, "No"}, + {0,NULL} +}; + +/*****************************************************************************/ + +static void dissect_ccsrl(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree) +{ + proto_item *ccsrl_item; + proto_tree *ccsrl_tree=NULL; + guint8 lastseg = tvb_get_guint8(tvb,0); + tvbuff_t *next_tvb; + + /* add the 'ccsrl' tree to the main tree */ + if (tree) { + ccsrl_item = proto_tree_add_item (tree, proto_ccsrl, tvb, 0, -1, FALSE); + ccsrl_tree = proto_item_add_subtree (ccsrl_item, ett_ccsrl); + proto_tree_add_uint(ccsrl_tree,hf_ccsrl_ls,tvb,0,1,lastseg); + } + + /* XXX add support for reassembly of fragments */ + + /* XXX currently, we always dissect as H245. It's not necessarily + that though. + */ + next_tvb = tvb_new_subset(tvb, 1, -1, -1 ); + call_dissector( h245dg_handle, next_tvb, pinfo, ccsrl_tree ); +} + +static void dissect_srp_command(tvbuff_t * tvb, packet_info * pinfo, proto_tree * srp_tree) +{ + tvbuff_t *next_tvb; + guint payload_len; + + if( srp_tree ) + proto_tree_add_item(srp_tree,hf_srp_seqno,tvb,1,1,FALSE); + + payload_len = tvb_reported_length_remaining(tvb,4); + next_tvb = tvb_new_subset(tvb, 2, payload_len, payload_len ); + + /* XXX currently, we always dissect as CCSRL. It's only that in + * H324/Annex C though. + */ + call_dissector(ccsrl_handle, next_tvb, pinfo, srp_tree ); +} + +static void dissect_srp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree) +{ + proto_item *srp_item = NULL; + proto_tree *srp_tree = NULL; + + guint8 header = tvb_get_guint8(tvb,0); + + /* add the 'srp' tree to the main tree */ + if (tree) { + srp_item = proto_tree_add_item (tree, proto_srp, tvb, 0, -1, FALSE); + srp_tree = proto_item_add_subtree (srp_item, ett_srp); + proto_tree_add_uint(srp_tree,hf_srp_header,tvb,0,1,header); + } + + switch( header ) { + case SRP_SRP_COMMAND: + dissect_srp_command(tvb,pinfo,srp_tree); + break; + + case SRP_SRP_RESPONSE: + break; + + case SRP_NSRP_RESPONSE: + if( srp_tree ) + proto_tree_add_item(srp_tree,hf_srp_seqno,tvb,1,1,FALSE); + break; + + default: + break; + } + + if( srp_tree ) { + guint16 crc, calc_crc; + guint crc_offset = tvb_reported_length(tvb)-2; + crc = tvb_get_letohs(tvb,-2); + + /* crc includes the header */ + calc_crc = crc16_ccitt_tvb(tvb,crc_offset); + + if( crc == calc_crc ) { + proto_tree_add_uint_format(srp_tree, hf_srp_crc, tvb, + crc_offset, 2, crc, + "CRC: 0x%04x (correct)", crc); + } else { + proto_tree_add_boolean_hidden(srp_tree, hf_srp_crc_bad, tvb, + crc_offset, 2, TRUE); + proto_tree_add_uint_format(srp_tree, hf_srp_crc, tvb, + crc_offset, 2, crc, + "CRC: 0x%04x (incorrect, should be 0x%04x)", + crc, + calc_crc); + } + } + +} + +void proto_register_ccsrl (void) +{ + static hf_register_info hf[] = { + { &hf_ccsrl_ls, + { "Last Segment","ccsrl.ls",FT_UINT8, BASE_HEX, ccsrl_ls_vals, 0x0, + "Last segment indicator", HFILL}}, + }; + + static gint *ett[] = { + &ett_ccsrl, + }; + + if (proto_ccsrl == -1) { /* execute protocol initialization only once */ + proto_ccsrl = + proto_register_protocol ("H.324/CCSRL", "CCSRL", "ccsrl"); + + proto_register_field_array (proto_ccsrl, hf, array_length (hf)); + proto_register_subtree_array (ett, array_length (ett)); + register_dissector("ccsrl", dissect_ccsrl, proto_ccsrl); + } +} + +void proto_register_srp (void) +{ + static hf_register_info hf[] = { + {&hf_srp_header, + { "Header", "srp.header", FT_UINT8, BASE_DEC, srp_frame_types, 0x0, + "SRP header octet", HFILL }}, + {&hf_srp_seqno, + { "Sequence Number", "srp.seqno", FT_UINT8, BASE_DEC, NULL, 0x0, + "Sequence Number", HFILL }}, + {&hf_srp_crc, + { "CRC", "srp.crc", FT_UINT16, BASE_HEX, NULL, 0x0, + "CRC", HFILL }}, + { &hf_srp_crc_bad, + { "Bad CRC","srp.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, + "", HFILL }}, + }; + + static gint *ett[] = { + &ett_srp, + }; + + if (proto_srp == -1) { /* execute protocol initialization only once */ + proto_srp = + proto_register_protocol ("H.324/SRP", "SRP", "srp"); + + proto_register_field_array (proto_srp, hf, array_length (hf)); + proto_register_subtree_array (ett, array_length (ett)); + register_dissector("srp", dissect_srp, proto_srp); + + /* register our init routine to be called at the start of a capture, + to clear out our hash tables etc */ + /* register_init_routine(&srp_init_protocol); */ + + } +} + + +void proto_reg_handoff_srp(void) { + data_handle = find_dissector("data"); + ccsrl_handle = find_dissector("ccsrl"); + h245dg_handle = find_dissector("h245dg"); +} |