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 1.17 2002/04/14 23:04:04 guy 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 #ifdef HAVE_SYS_TYPES_H
  33 #include <sys/types.h>
  34 #endif
  35
  36 #include <glib.h>
  37 #include <epan/packet.h>
  38 #include <epan/strutil.h>
  39
  40 static int proto_rsh = -1;
  41 static int hf_rsh_response = -1;
  42 static int hf_rsh_request = -1;
  43 static gint ett_rsh = -1;
  44
  45 #define TCP_PORT_RSH                    514
  46
  47 static void
  48 dissect_rsh(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  49 {
  50         proto_tree      *rsh_tree;
  51         proto_item      *ti;
  52         gint            offset = 0;
  53         gint            next_offset;
  54         int             linelen;
  55
  56         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  57                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RSH");
  58         if (check_col(pinfo->cinfo, COL_INFO)) {
  59                 /* Put the first line from the buffer into the summary. */
  60                 tvb_find_line_end(tvb, offset, -1, &next_offset);
  61                 linelen = next_offset - offset; /* include the line terminator */
  62
  63                 /*
  64                  * Make sure the line terminator isn't past the end of
  65                  * the captured data in the packet, so we don't throw
  66                  * an exception in the "tvb_get_ptr()" call.
  67                  */
  68                 if (linelen > (int) tvb_length(tvb))
  69                         linelen = tvb_length(tvb);
  70                 col_add_str(pinfo->cinfo, COL_INFO,
  71                     tvb_format_text(tvb, offset, linelen));
  72         }
  73         if (tree) {
  74                 ti = proto_tree_add_item(tree, proto_rsh, tvb, offset, -1,
  75                     FALSE);
  76                 rsh_tree = proto_item_add_subtree(ti, ett_rsh);
  77
  78                 /*
  79                  * Process the packet data, a line at a time.
  80                  */
  81                 while (tvb_offset_exists(tvb, offset)) {
  82                         /*
  83                          * Find the end of the line.
  84                          */
  85                         tvb_find_line_end(tvb, offset, -1, &next_offset);
  86
  87                         /*
  88                          * Put this line.
  89                          */
  90                         proto_tree_add_text(rsh_tree, tvb, offset,
  91                             next_offset - offset, "%s",
  92                             tvb_format_text(tvb, offset, next_offset - offset));
  93                         offset = next_offset;
  94                 }
  95
  96                 if (pinfo->match_port == pinfo->destport)
  97                         proto_tree_add_boolean_hidden(rsh_tree,
  98                             hf_rsh_request, tvb, 0, 0, 1);
  99                 else
 100                         proto_tree_add_boolean_hidden(rsh_tree,
 101                             hf_rsh_response, tvb, 0, 0, 1);
 102         }
 103 }
 104
 105 void
 106 proto_register_rsh(void)
 107 {
 108
 109         static hf_register_info hf[] = {
 110                 { &hf_rsh_response,
 111                 { "Response",           "rsh.response",
 112                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 113                 "TRUE if rsh response", HFILL }},
 114                 { &hf_rsh_request,
 115                 { "Request",            "rsh.request",
 116                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 117                 "TRUE if rsh request", HFILL }},
 118         };
 119
 120         static gint *ett[] = {
 121                 &ett_rsh,
 122         };
 123
 124         proto_rsh = proto_register_protocol("Remote Shell", "RSH", "rsh");
 125         proto_register_field_array(proto_rsh, hf, array_length(hf));
 126         proto_register_subtree_array(ett, array_length(ett));
 127 }
 128
 129 void
 130 proto_reg_handoff_rsh(void)
 131 {
 132         dissector_handle_t rsh_handle;
 133
 134         rsh_handle = create_dissector_handle(dissect_rsh, proto_rsh);
 135         dissector_add("tcp.port", TCP_PORT_RSH, rsh_handle);
 136 }