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 1.2 1999/07/07 22:51:53 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 void dissect_sdp(const u_char *pd, int offset, frame_data *fd,
  44         proto_tree *tree)
  45 {
  46         proto_tree      *sdp_tree;
  47         proto_item      *ti;
  48         const u_char    *data, *dataend;
  49         const u_char    *lineend, *eol;
  50         int             linelen;
  51         u_char          section;
  52         u_char          type;
  53         const u_char    *value;
  54         int             valuelen;
  55         const char      *typename;
  56
  57         data = &pd[offset];
  58         dataend = data + END_OF_FRAME;
  59
  60         if (check_col(fd, COL_PROTOCOL))
  61                 col_add_str(fd, COL_PROTOCOL, "SDP");
  62
  63         if (check_col(fd, COL_INFO)) {
  64                 /* XXX: Needs description. */
  65                 col_add_str(fd, COL_INFO, "Session Description");
  66         }
  67
  68         if (!tree)
  69                 return;
  70
  71         ti = proto_tree_add_text(tree, offset, END_OF_FRAME,
  72                 "Session Description Protocol");
  73         sdp_tree = proto_item_add_subtree(ti, ETT_SDP);
  74
  75         section = 0;
  76         for (; data < dataend; offset += linelen, data = lineend) {
  77                 /*
  78                  * Find the end of the line.
  79                  */
  80                 lineend = find_line_end(data, dataend, &eol);
  81                 linelen = lineend - data;
  82
  83                 /*
  84                  * Line must contain at least e.g. "v=".
  85                  */
  86                 if (linelen < 2)
  87                         break;
  88
  89                 type = data[0];
  90                 if (data[1] != '=') {
  91                         proto_tree_add_text(sdp_tree, offset, linelen,
  92                                 "Invalid line: %s",
  93                                 format_text(data, linelen));
  94                         continue;
  95                 }
  96                 value = data + 2;
  97                 valuelen = linelen - 2;
  98
  99                 /*
 100                  * Attributes.
 101                  */
 102                 switch (type) {
 103                 case 'v':
 104                         section = 'v';
 105                         typename = "Session Description, version";
 106                         break;
 107                 case 'o':
 108                         typename = "Owner/Creator, Session Id";
 109                         break;
 110                 case 's':
 111                         typename = "Session Name";
 112                         break;
 113                 case 'i':
 114                         if (section == 'v')
 115                                 typename = "Session Information";
 116                         else if (section == 'm')
 117                                 typename = "Media Title";
 118                         else
 119                                 typename = "Misplaced";
 120                         break;
 121                 case 'u':
 122                         typename = "URI of Description";
 123                         break;
 124                 case 'e':
 125                         typename = "E-mail Address";
 126                         break;
 127                 case 'p':
 128                         typename = "Phone Number";
 129                         break;
 130                 case 'c':
 131                         typename = "Connection Information";
 132                         break;
 133                 case 'b':
 134                         typename = "Bandwidth Information";
 135                         break;
 136                 case 't':
 137                         section = 't';
 138                         typename = "Time Description, active time";
 139                         break;
 140                 case 'r':
 141                         typename = "Repeat Time";
 142                         break;
 143                 case 'm':
 144                         section = 'm';
 145                         typename = "Media Description, name and address";
 146                         break;
 147                 case 'k':
 148                         typename = "Encryption Key";
 149                         break;
 150                 case 'a':
 151                         if (section == 'v')
 152                                 typename = "Session Attribute";
 153                         else if (section == 'm')
 154                                 typename = "Media Attribute";
 155                         else
 156                                 typename = "Misplaced";
 157                         break;
 158                 case 'z':
 159                         typename = "Time Zone Adjustment";
 160                         break;
 161                 default:
 162                         typename = "Unknown";
 163                         break;
 164                 }
 165
 166                 proto_tree_add_text(sdp_tree, offset, linelen,
 167                         "%s (%c): %s", typename, type,
 168                         format_text(value, valuelen));
 169         }
 170
 171         if (data < dataend) {
 172                 proto_tree_add_text(sdp_tree, offset, END_OF_FRAME,
 173                     "Data (%d bytes)", END_OF_FRAME);
 174         }
 175 }