packet-rsh.c

   1 /* packet-rsh.c
   2  * Routines for rsh packet disassembly
   3  *
   4  * Robert Tsai <rtsai@netapp.com>
   5  * Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
   6  *
   7  * $Id: packet-rsh.c,v 1.20 2002/08/28 21:00:29 jmayer Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <glib.h>
  33 #include <epan/packet.h>
  34 #include <epan/strutil.h>
  35
  36 static int proto_rsh = -1;
  37 static int hf_rsh_response = -1;
  38 static int hf_rsh_request = -1;
  39 static gint ett_rsh = -1;
  40
  41 #define TCP_PORT_RSH                    514
  42
  43 static void
  44 dissect_rsh(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  45 {
  46         proto_tree      *rsh_tree;
  47         proto_item      *ti;
  48         gint            offset = 0;
  49         gint            next_offset;
  50         int             linelen;
  51
  52         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  53                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RSH");
  54         if (check_col(pinfo->cinfo, COL_INFO)) {
  55                 /* Put the first line from the buffer into the summary. */
  56                 tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
  57                 linelen = next_offset - offset; /* include the line terminator */
  58
  59                 /*
  60                  * Make sure the line terminator isn't past the end of
  61                  * the captured data in the packet, so we don't throw
  62                  * an exception in the "tvb_get_ptr()" call.
  63                  */
  64                 if (linelen > (int) tvb_length(tvb))
  65                         linelen = tvb_length(tvb);
  66                 col_add_str(pinfo->cinfo, COL_INFO,
  67                     tvb_format_text(tvb, offset, linelen));
  68         }
  69         if (tree) {
  70                 ti = proto_tree_add_item(tree, proto_rsh, tvb, offset, -1,
  71                     FALSE);
  72                 rsh_tree = proto_item_add_subtree(ti, ett_rsh);
  73
  74                 /*
  75                  * Process the packet data, a line at a time.
  76                  */
  77                 while (tvb_offset_exists(tvb, offset)) {
  78                         /*
  79                          * Find the end of the line.
  80                          */
  81                         tvb_find_line_end(tvb, offset, -1, &next_offset,
  82                             FALSE);
  83
  84                         /*
  85                          * Put this line.
  86                          */
  87                         proto_tree_add_text(rsh_tree, tvb, offset,
  88                             next_offset - offset, "%s",
  89                             tvb_format_text(tvb, offset, next_offset - offset));
  90                         offset = next_offset;
  91                 }
  92
  93                 if (pinfo->match_port == pinfo->destport)
  94                         proto_tree_add_boolean_hidden(rsh_tree,
  95                             hf_rsh_request, tvb, 0, 0, 1);
  96                 else
  97                         proto_tree_add_boolean_hidden(rsh_tree,
  98                             hf_rsh_response, tvb, 0, 0, 1);
  99         }
 100 }
 101
 102 void
 103 proto_register_rsh(void)
 104 {
 105
 106         static hf_register_info hf[] = {
 107                 { &hf_rsh_response,
 108                 { "Response",           "rsh.response",
 109                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 110                 "TRUE if rsh response", HFILL }},
 111                 { &hf_rsh_request,
 112                 { "Request",            "rsh.request",
 113                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 114                 "TRUE if rsh request", HFILL }},
 115         };
 116
 117         static gint *ett[] = {
 118                 &ett_rsh,
 119         };
 120
 121         proto_rsh = proto_register_protocol("Remote Shell", "RSH", "rsh");
 122         proto_register_field_array(proto_rsh, hf, array_length(hf));
 123         proto_register_subtree_array(ett, array_length(ett));
 124 }
 125
 126 void
 127 proto_reg_handoff_rsh(void)
 128 {
 129         dissector_handle_t rsh_handle;
 130
 131         rsh_handle = create_dissector_handle(dissect_rsh, proto_rsh);
 132         dissector_add("tcp.port", TCP_PORT_RSH, rsh_handle);
 133 }