packet-h1.c

   1 /* packet-h1.c
   2  * Routines for Sinec H1 packet disassembly
   3  * Gerrit Gehnen <G.Gehnen@atrie.de>
   4  *
   5  * $Id: packet-h1.c,v 1.22 2001/12/10 00:25:28 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #ifdef HAVE_SYS_TYPES_H
  31 # include <sys/types.h>
  32 #endif
  33
  34 #include <string.h>
  35
  36 #include <glib.h>
  37 #include "packet.h"
  38
  39 static int proto_h1 = -1;
  40 static int hf_h1_header = -1;
  41 static int hf_h1_len = -1;
  42 static int hf_h1_opfield = -1;
  43 static int hf_h1_oplen = -1;
  44 static int hf_h1_opcode = -1;
  45 static int hf_h1_requestblock = -1;
  46 static int hf_h1_requestlen = -1;
  47 static int hf_h1_dbnr = -1;
  48 static int hf_h1_dwnr = -1;
  49 static int hf_h1_dlen = -1;
  50 static int hf_h1_org = -1;
  51 static int hf_h1_response = -1;
  52 static int hf_h1_response_len = -1;
  53 static int hf_h1_response_value = -1;
  54 static int hf_h1_empty_len = -1;
  55 static int hf_h1_empty = -1;
  56
  57 static dissector_handle_t data_handle;
  58
  59 #define EMPTY_BLOCK     0xFF
  60 #define OPCODE_BLOCK    0x01
  61 #define REQUEST_BLOCK   0x03
  62 #define RESPONSE_BLOCK  0x0F
  63
  64 static const value_string opcode_vals[] = {
  65   {3, "Write Request"},
  66   {4, "Write Response"},
  67   {5, "Read Request"},
  68   {6, "Read Response"},
  69   {0, NULL}
  70 };
  71
  72 static const value_string org_vals[] = {
  73   {0x01, "DB"},
  74   {0x02, "MB"},
  75   {0x03, "EB"},
  76   {0x04, "AB"},
  77   {0x05, "PB"},
  78   {0x06, "ZB"},
  79   {0x07, "TB"},
  80   {0x08, "BS"},
  81   {0x09, "AS"},
  82   {0x0a, "DX"},
  83   {0x10, "DE"},
  84   {0x11, "QB"},
  85   {0, NULL}
  86 };
  87
  88 static const value_string returncode_vals[] = {
  89   {0x00, "No error"},
  90   {0x02, "Requested block does not exist"},
  91   {0x03, "Requested block too small"},
  92   {0xFF, "Error, reason unknown"},
  93   {0, NULL}
  94 };
  95
  96 static gint ett_h1 = -1;
  97 static gint ett_opcode = -1;
  98 static gint ett_org = -1;
  99 static gint ett_response = -1;
 100 static gint ett_empty = -1;
 101
 102 static gboolean dissect_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 103 {
 104   tvbuff_t *next_tvb;
 105
 106   proto_tree *h1_tree = NULL;
 107
 108   proto_item *ti;
 109   proto_tree *opcode_tree = NULL;
 110   proto_tree *org_tree = NULL;
 111   proto_tree *response_tree = NULL;
 112   proto_tree *empty_tree = NULL;
 113
 114   unsigned int position = 3;
 115   unsigned int offset=0;
 116
 117   if (tvb_length_remaining(tvb, 0) < 2)
 118     {
 119       /* Not enough data captured to hold the "S5" header; don't try
 120          to interpret it as H1. */
 121       return FALSE;
 122     }
 123
 124   if (!(tvb_get_guint8(tvb,offset) == 'S' && tvb_get_guint8(tvb,offset+1) == '5'))
 125     {
 126       return FALSE;
 127     }
 128
 129   if (check_col (pinfo->cinfo, COL_PROTOCOL))
 130     col_set_str (pinfo->cinfo, COL_PROTOCOL, "H1");
 131   if (check_col (pinfo->cinfo, COL_INFO))
 132     col_add_str (pinfo->cinfo, COL_INFO, "S5: ");
 133   if (tree)
 134     {
 135       ti = proto_tree_add_item (tree, proto_h1, tvb, offset, 16, FALSE);
 136       h1_tree = proto_item_add_subtree (ti, ett_h1);
 137       proto_tree_add_uint (h1_tree, hf_h1_header, tvb, offset, 2,
 138                            tvb_get_ntohs(tvb,offset));
 139       proto_tree_add_uint (h1_tree, hf_h1_len, tvb, offset + 2, 1,
 140                            tvb_get_guint8(tvb,offset+2));
 141     }
 142
 143   while (position < tvb_get_guint8(tvb,offset+2))
 144     {
 145       switch (tvb_get_guint8(tvb,offset + position))
 146         {
 147           case OPCODE_BLOCK:
 148             if (h1_tree)
 149               {
 150                 ti = proto_tree_add_uint (h1_tree, hf_h1_opfield, tvb,
 151                                           offset + position,
 152                                           tvb_get_guint8(tvb,offset+position+1),
 153                                           tvb_get_guint8(tvb,offset+position));
 154                 opcode_tree = proto_item_add_subtree (ti, ett_opcode);
 155                 proto_tree_add_uint (opcode_tree, hf_h1_oplen, tvb,
 156                                      offset + position + 1, 1,
 157                                      tvb_get_guint8(tvb,offset + position + 1));
 158                 proto_tree_add_uint (opcode_tree, hf_h1_opcode, tvb,
 159                                      offset + position + 2, 1,
 160                                      tvb_get_guint8(tvb,offset + position + 2));
 161               }
 162             if (check_col (pinfo->cinfo, COL_INFO))
 163               {
 164                 col_append_str (pinfo->cinfo, COL_INFO,
 165                                 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
 166                                             opcode_vals,"Unknown Opcode (0x%2.2x)"));
 167               }
 168             break;
 169           case REQUEST_BLOCK:
 170             if (h1_tree)
 171               {
 172                 ti = proto_tree_add_uint (h1_tree, hf_h1_requestblock, tvb,
 173                                           offset + position,
 174                                           tvb_get_guint8(tvb,offset + position + 1),
 175                                           tvb_get_guint8(tvb,offset + position));
 176                 org_tree = proto_item_add_subtree (ti, ett_org);
 177                 proto_tree_add_uint (org_tree, hf_h1_requestlen, tvb,
 178                                      offset + position + 1, 1,
 179                                      tvb_get_guint8(tvb,offset + position+1));
 180                 proto_tree_add_uint (org_tree, hf_h1_org, tvb,
 181                                      offset + position + 2, 1,
 182                                      tvb_get_guint8(tvb,offset + position+2));
 183                 proto_tree_add_uint (org_tree, hf_h1_dbnr, tvb,
 184                                      offset + position + 3, 1,
 185                                      tvb_get_guint8(tvb,offset + position+3));
 186                 proto_tree_add_uint (org_tree, hf_h1_dwnr, tvb,
 187                                      offset + position + 4, 2,
 188                                      tvb_get_ntohs(tvb,offset+position+4));
 189                 proto_tree_add_int (org_tree, hf_h1_dlen, tvb,
 190                                     offset + position + 6, 2,
 191                                     tvb_get_ntohs(tvb,offset+position+6));
 192               }
 193             if (check_col (pinfo->cinfo, COL_INFO))
 194               {
 195                 col_append_fstr (pinfo->cinfo, COL_INFO, " %s %d",
 196                                  val_to_str (tvb_get_guint8(tvb,offset + position + 2),
 197                                              org_vals,"Unknown Type (0x%2.2x)"),
 198                                  tvb_get_guint8(tvb,offset + position + 3));
 199                 col_append_fstr (pinfo->cinfo, COL_INFO, " DW %d",
 200                                  tvb_get_ntohs(tvb,offset+position+4));
 201                 col_append_fstr (pinfo->cinfo, COL_INFO, " Count %d",
 202                                  tvb_get_ntohs(tvb,offset+position+6));
 203               }
 204             break;
 205           case RESPONSE_BLOCK:
 206             if (h1_tree)
 207               {
 208                 ti = proto_tree_add_uint (h1_tree, hf_h1_response, tvb,
 209                                           offset + position,
 210                                           tvb_get_guint8(tvb,offset + position + 1),
 211                                           tvb_get_guint8(tvb,offset + position));
 212                 response_tree = proto_item_add_subtree (ti, ett_response);
 213                 proto_tree_add_uint (response_tree, hf_h1_response_len, tvb,
 214                                      offset + position + 1, 1,
 215                                      tvb_get_guint8(tvb,offset + position+1));
 216                 proto_tree_add_uint (response_tree, hf_h1_response_value, tvb,
 217                                      offset + position + 2, 1,
 218                                      tvb_get_guint8(tvb,offset + position+2));
 219               }
 220             if (check_col (pinfo->cinfo, COL_INFO))
 221               {
 222                 col_append_fstr (pinfo->cinfo, COL_INFO, " %s",
 223                                  val_to_str (tvb_get_guint8(tvb,offset + position + 2),
 224                                              returncode_vals,"Unknown Returcode (0x%2.2x"));
 225               }
 226             break;
 227           case EMPTY_BLOCK:
 228             if (h1_tree)
 229               {
 230                 ti = proto_tree_add_uint (h1_tree, hf_h1_empty, tvb,
 231                                           offset + position,
 232                                           tvb_get_guint8(tvb,offset + position + 1),
 233                                           tvb_get_guint8(tvb,offset + position));
 234                 empty_tree = proto_item_add_subtree (ti, ett_empty);
 235
 236                 proto_tree_add_uint (empty_tree, hf_h1_empty_len, tvb,
 237                                      offset + position + 1, 1,
 238                                      tvb_get_guint8(tvb,offset + position+1));
 239               }
 240             break;
 241           default:
 242             /* This is not a valid telegram. So cancel dissection
 243                and try the next dissector */
 244             return FALSE;
 245             break;
 246         }
 247         position += tvb_get_guint8(tvb,offset + position + 1);  /* Goto next section */
 248     }                   /* ..while */
 249   next_tvb = tvb_new_subset(tvb, offset+tvb_get_guint8(tvb,offset+2), -1, -1);
 250   call_dissector(data_handle,next_tvb, pinfo, tree);
 251
 252   return TRUE;
 253 }
 254
 255
 256 void
 257 proto_register_h1 (void)
 258 {
 259   static hf_register_info hf[] = {
 260     {&hf_h1_header,
 261      {"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
 262       "", HFILL }},
 263     {&hf_h1_len,
 264      {"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
 265       "", HFILL }},
 266     {&hf_h1_opfield,
 267      {"Operation identifier", "h1.opfield", FT_UINT8, BASE_HEX, NULL, 0x0,
 268       "", HFILL }},
 269     {&hf_h1_oplen,
 270      {"Operation length", "h1.oplen", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
 271     {&hf_h1_opcode,
 272      {"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
 273       "", HFILL }},
 274     {&hf_h1_requestblock,
 275      {"Request identifier", "h1.request", FT_UINT8, BASE_HEX, NULL, 0x0,
 276       "", HFILL }},
 277     {&hf_h1_requestlen,
 278      {"Request length", "h1.reqlen", FT_UINT8, BASE_HEX, NULL, 0x0,
 279       "", HFILL }},
 280     {&hf_h1_org,
 281      {"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
 282       "", HFILL }},
 283     {&hf_h1_dbnr,
 284      {"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
 285     {&hf_h1_dwnr,
 286      {"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
 287       "", HFILL }},
 288     {&hf_h1_dlen,
 289      {"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, "", HFILL }},
 290     {&hf_h1_response,
 291      {"Response identifier", "h1.response", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
 292     {&hf_h1_response_len,
 293      {"Response length", "h1.reslen", FT_UINT8, BASE_DEC, NULL, 0x0,
 294       "", HFILL }},
 295     {&hf_h1_response_value,
 296      {"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
 297       VALS (returncode_vals), 0x0, "", HFILL }},
 298     {&hf_h1_empty,
 299      {"Empty field", "h1.empty", FT_UINT8, BASE_HEX, NULL, 0x0,
 300       "", HFILL }},
 301     {&hf_h1_empty_len,
 302      {"Empty field length", "h1.empty_len", FT_UINT8, BASE_DEC, NULL, 0x0,
 303       "", HFILL }}
 304   };
 305
 306   static gint *ett[] = {
 307     &ett_h1,
 308     &ett_opcode,
 309     &ett_response,
 310     &ett_org,
 311     &ett_empty
 312   };
 313
 314   proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "H1", "h1");
 315   proto_register_field_array (proto_h1, hf, array_length (hf));
 316   proto_register_subtree_array (ett, array_length (ett));
 317 }
 318
 319 void
 320 proto_reg_handoff_h1(void)
 321 {
 322   heur_dissector_add("cotp_is", dissect_h1, proto_h1);
 323   data_handle = find_dissector("data");
 324 }