packet-sdp.c

   1 /* packet-sdp.c
   2  * Routines for SDP packet disassembly
   3  *
   4  * Jason Lango <jal@netapp.com>
   5  * Liberally copied from packet-http.c, by Guy Harris <guy@netapp.com>
   6  *
   7  * $Id: packet-sdp.c,v 1.3 1999/07/29 05:47:03 gram Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@zing.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  27  *
  28  *
  29  */
  30
  31 #include "config.h"
  32
  33 #ifdef HAVE_SYS_TYPES_H
  34 #include <sys/types.h>
  35 #endif
  36
  37 #include <string.h>
  38 #include <ctype.h>
  39
  40 #include <glib.h>
  41 #include "packet.h"
  42
  43 static int proto_sdp = -1;
  44
  45 void dissect_sdp(const u_char *pd, int offset, frame_data *fd,
  46         proto_tree *tree)
  47 {
  48         proto_tree      *sdp_tree;
  49         proto_item      *ti;
  50         const u_char    *data, *dataend;
  51         const u_char    *lineend, *eol;
  52         int             linelen;
  53         u_char          section;
  54         u_char          type;
  55         const u_char    *value;
  56         int             valuelen;
  57         const char      *typename;
  58
  59         data = &pd[offset];
  60         dataend = data + END_OF_FRAME;
  61
  62         if (check_col(fd, COL_PROTOCOL))
  63                 col_add_str(fd, COL_PROTOCOL, "SDP");
  64
  65         if (check_col(fd, COL_INFO)) {
  66                 /* XXX: Needs description. */
  67                 col_add_str(fd, COL_INFO, "Session Description");
  68         }
  69
  70         if (!tree)
  71                 return;
  72
  73         ti = proto_tree_add_item(tree, proto_sdp, offset, END_OF_FRAME, NULL);
  74         sdp_tree = proto_item_add_subtree(ti, ETT_SDP);
  75
  76         section = 0;
  77         for (; data < dataend; offset += linelen, data = lineend) {
  78                 /*
  79                  * Find the end of the line.
  80                  */
  81                 lineend = find_line_end(data, dataend, &eol);
  82                 linelen = lineend - data;
  83
  84                 /*
  85                  * Line must contain at least e.g. "v=".
  86                  */
  87                 if (linelen < 2)
  88                         break;
  89
  90                 type = data[0];
  91                 if (data[1] != '=') {
  92                         proto_tree_add_text(sdp_tree, offset, linelen,
  93                                 "Invalid line: %s",
  94                                 format_text(data, linelen));
  95                         continue;
  96                 }
  97                 value = data + 2;
  98                 valuelen = linelen - 2;
  99
 100                 /*
 101                  * Attributes.
 102                  */
 103                 switch (type) {
 104                 case 'v':
 105                         section = 'v';
 106                         typename = "Session Description, version";
 107                         break;
 108                 case 'o':
 109                         typename = "Owner/Creator, Session Id";
 110                         break;
 111                 case 's':
 112                         typename = "Session Name";
 113                         break;
 114                 case 'i':
 115                         if (section == 'v')
 116                                 typename = "Session Information";
 117                         else if (section == 'm')
 118                                 typename = "Media Title";
 119                         else
 120                                 typename = "Misplaced";
 121                         break;
 122                 case 'u':
 123                         typename = "URI of Description";
 124                         break;
 125                 case 'e':
 126                         typename = "E-mail Address";
 127                         break;
 128                 case 'p':
 129                         typename = "Phone Number";
 130                         break;
 131                 case 'c':
 132                         typename = "Connection Information";
 133                         break;
 134                 case 'b':
 135                         typename = "Bandwidth Information";
 136                         break;
 137                 case 't':
 138                         section = 't';
 139                         typename = "Time Description, active time";
 140                         break;
 141                 case 'r':
 142                         typename = "Repeat Time";
 143                         break;
 144                 case 'm':
 145                         section = 'm';
 146                         typename = "Media Description, name and address";
 147                         break;
 148                 case 'k':
 149                         typename = "Encryption Key";
 150                         break;
 151                 case 'a':
 152                         if (section == 'v')
 153                                 typename = "Session Attribute";
 154                         else if (section == 'm')
 155                                 typename = "Media Attribute";
 156                         else
 157                                 typename = "Misplaced";
 158                         break;
 159                 case 'z':
 160                         typename = "Time Zone Adjustment";
 161                         break;
 162                 default:
 163                         typename = "Unknown";
 164                         break;
 165                 }
 166
 167                 proto_tree_add_text(sdp_tree, offset, linelen,
 168                         "%s (%c): %s", typename, type,
 169                         format_text(value, valuelen));
 170         }
 171
 172         if (data < dataend) {
 173                 proto_tree_add_text(sdp_tree, offset, END_OF_FRAME,
 174                     "Data (%d bytes)", END_OF_FRAME);
 175         }
 176 }
 177
 178 void
 179 proto_register_sdp(void)
 180 {
 181 /*        static hf_register_info hf[] = {
 182                 { &variable,
 183                 { "Name",           "sdp.abbreviation", TYPE, VALS_POINTER }},
 184         };*/
 185
 186         proto_sdp = proto_register_protocol("Session Description Protocol", "sdp");
 187  /*       proto_register_field_array(proto_sdp, hf, array_length(hf));*/
 188 }