epan/dissectors/packet-l1-events.c

   1 /* packet-l1-events.c
   2  * Routines for text-based layer 1 messages in EyeSDN trace files
   3  *
   4  * (C) Rolf Fiedler 2008, based on packet-text-media.c by Olivier Biot, 2004.
   5  *
   6  * Refer to the AUTHORS file or the AUTHORS section in the man page
   7  * for contacting the author(s) of this file.
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * SPDX-License-Identifier: GPL-2.0-or-later
  14  */
  15
  16 /* Edit this file with 4-space tabs */
  17
  18 #include "config.h"
  19
  20 #include <epan/packet.h>
  21 #include <wiretap/wtap.h>
  22
  23 void proto_register_l1_events(void);
  24 void proto_reg_handoff_l1_events(void);
  25
  26 static dissector_handle_t l1_events_handle;
  27 /*
  28  * dissector for line-based text messages from layer 1
  29  */
  30
  31 /* Filterable header fields */
  32 static int proto_l1_events;
  33
  34 /* Subtrees */
  35 static int ett_l1_events;
  36
  37 static int
  38 dissect_l1_events(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  39 {
  40         proto_tree      *subtree;
  41         proto_item      *ti;
  42         int             offset = 0, next_offset;
  43         int             len;
  44
  45         col_set_str(pinfo->cinfo, COL_PROTOCOL, "Layer1");
  46         col_set_str(pinfo->cinfo, COL_DEF_SRC,
  47                             pinfo->pseudo_header->l1event.uton? "TE" : "NT");
  48         len = tvb_find_line_end(tvb, 0, -1, &next_offset, false);
  49         if(len>0)
  50                 col_add_str(pinfo->cinfo, COL_INFO, tvb_format_text(pinfo->pool, tvb, 0, len));
  51
  52         if (tree) {
  53                 ti = proto_tree_add_item(tree, proto_l1_events,
  54                                 tvb, 0, -1, ENC_NA);
  55                 subtree = proto_item_add_subtree(ti, ett_l1_events);
  56                 /* Read the media line by line */
  57                 while (tvb_offset_exists(tvb, offset)) {
  58                         /*
  59                          * XXX - we need to be passed the parameters
  60                          * of the content type via data parameter,
  61                          * so that we know the character set.  We'd
  62                          * have to handle that character set, which
  63                          * might be a multibyte character set such
  64                          * as "iso-10646-ucs-2", or might require other
  65                          * special processing.
  66                          */
  67                         len = tvb_find_line_end(tvb, offset, -1, &next_offset, false);
  68                         if (len == -1)
  69                                 break;
  70
  71                         /* We use next_offset - offset instead of len in the
  72                          * call to proto_tree_add_format_text() so it will include the
  73                          * line terminator(s) (\r and/or \n) in the display.
  74                          */
  75                         proto_tree_add_format_text(subtree, tvb, offset, next_offset - offset);
  76                         offset = next_offset;
  77                 }
  78         }
  79
  80         return tvb_captured_length(tvb);
  81 }
  82
  83 void
  84 proto_register_l1_events(void)
  85 {
  86         static int *ett[] = {
  87                 &ett_l1_events,
  88         };
  89
  90         proto_register_subtree_array(ett, array_length(ett));
  91
  92         proto_l1_events = proto_register_protocol("Layer 1 Event Messages", "Layer 1 Events", "data-l1-events");
  93
  94         l1_events_handle = register_dissector("data-l1-events", dissect_l1_events, proto_l1_events);
  95 }
  96
  97 void
  98 proto_reg_handoff_l1_events(void)
  99 {
 100         dissector_add_uint("wtap_encap", WTAP_ENCAP_LAYER1_EVENT, l1_events_handle); /* for text msgs from trace files */
 101 }
 102
 103 /*
 104  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 105  *
 106  * Local variables:
 107  * c-basic-offset: 8
 108  * tab-width: 8
 109  * indent-tabs-mode: t
 110  * End:
 111  *
 112  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 113  * :indentSize=8:tabSize=8:noTabs=false:
 114  */