epan/dissectors/packet-h1.c

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