epan/dissectors/packet-gsmtap_log.c

   1 /* packet-gsmtap-log.c
   2  * Routines for GSMTAP logging packets
   3  *
   4  * (C) 2016 by Harald Welte <laforge@gnumonks.org>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include "config.h"
  14
  15 #include <epan/packet.h>
  16 #include "packet-gsmtap.h"
  17
  18 void proto_register_gsmtap_log(void);
  19 void proto_reg_handoff_gsmtap_log(void);
  20
  21 static dissector_handle_t gsmtap_log_handle;
  22
  23 static int proto_gsmtap_log;
  24
  25 static int hf_log_ident;
  26 static int hf_log_subsys;
  27 static int hf_log_file_name;
  28 static int hf_log_file_line;
  29 static int hf_log_ts;
  30 static int hf_log_pid;
  31 static int hf_log_level;
  32 static int hf_log_string;
  33
  34 static int ett_gsmtap_log;
  35
  36 /* from libosmocore include/osmocom/core/logging.h */
  37 static const value_string gsmtap_log_levels[] = {
  38         { 1,    "DEBUG" },
  39         { 3,    "INFO" },
  40         { 5,    "NOTICE" },
  41         { 7,    "ERROR" },
  42         { 8,    "FATAL" },
  43         { 0, NULL }
  44 };
  45
  46 /* dissect a GSMTAP header and hand payload off to respective dissector */
  47 static int
  48 dissect_gsmtap_log(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void * data _U_)
  49 {
  50         proto_item *ti;
  51         proto_tree *log_tree;
  52         int offset = 0;
  53         int log_str_len;
  54         unsigned log_pid, log_level, log_src_line;
  55         const char *log_str;
  56         const uint8_t *log_ident, *log_subsys, *log_src_fname;
  57
  58         ti = proto_tree_add_item(tree, proto_gsmtap_log, tvb, 0, -1, ENC_NA);
  59         log_tree = proto_item_add_subtree(ti, ett_gsmtap_log);
  60
  61         proto_tree_add_item(log_tree, hf_log_ts, tvb, offset, 8, ENC_TIME_SECS_USECS|ENC_BIG_ENDIAN);
  62         offset += 8;
  63         proto_tree_add_item_ret_string(log_tree, hf_log_ident, tvb, offset, 16, ENC_NA, pinfo->pool, &log_ident);
  64         offset += 16;
  65         proto_tree_add_item_ret_uint(log_tree, hf_log_pid, tvb, offset, 4, ENC_BIG_ENDIAN, &log_pid);
  66         offset += 4;
  67         proto_tree_add_item_ret_uint(log_tree, hf_log_level, tvb, offset++, 1, ENC_NA, &log_level);
  68         offset += 3; /* pad octets */
  69         proto_tree_add_item_ret_string(log_tree, hf_log_subsys, tvb, offset, 16, ENC_NA, pinfo->pool, &log_subsys);
  70         offset += 16;
  71         proto_tree_add_item_ret_string(log_tree, hf_log_file_name, tvb, offset, 32, ENC_NA, pinfo->pool, &log_src_fname);
  72         offset += 32;
  73         proto_tree_add_item_ret_uint(log_tree, hf_log_file_line, tvb, offset, 4, ENC_BIG_ENDIAN, &log_src_line);
  74         offset += 4;
  75
  76         /* actual log message */
  77         log_str_len = tvb_captured_length_remaining(tvb, offset);
  78         proto_tree_add_item(log_tree, hf_log_string, tvb, offset, log_str_len, ENC_ASCII);
  79
  80         log_str = tvb_format_stringzpad_wsp(pinfo->pool, tvb, offset, log_str_len);
  81         col_append_str(pinfo->cinfo, COL_INFO, log_str);
  82
  83         proto_item_append_text(ti, " %s(%u): %s/%d: %s:%u %s",
  84                         log_ident, log_pid, log_subsys, log_level,
  85                         log_src_fname, log_src_line, log_str);
  86         return tvb_captured_length(tvb);
  87 }
  88
  89 void
  90 proto_register_gsmtap_log(void)
  91 {
  92         static hf_register_info hf[] = {
  93                 { &hf_log_ident, { "Application", "gsmtap_log.ident",
  94                   FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
  95                 { &hf_log_subsys, { "Subsystem", "gsmtap_log.subsys",
  96                   FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
  97                 { &hf_log_file_name, { "Source File Name", "gsmtap_log.src_file.name",
  98                   FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
  99                 { &hf_log_file_line, { "Source File Line Number", "gsmtap_log.src_file.line_nr",
 100                   FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
 101                 { &hf_log_ts, { "Timestamp", "gsmtap_log.timestamp",
 102                   FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0, NULL, HFILL } },
 103                 { &hf_log_pid, { "Process ID", "gsmtap_log.pid",
 104                   FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
 105                 { &hf_log_level, { "Log Level", "gsmtap_log.level",
 106                   FT_UINT8, BASE_DEC, VALS(gsmtap_log_levels), 0, NULL, HFILL } },
 107                 { &hf_log_string, { "String", "gsmtap_log.string",
 108                   FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
 109         };
 110
 111         static int *ett[] = {
 112                 &ett_gsmtap_log,
 113         };
 114
 115         proto_gsmtap_log = proto_register_protocol("GSMTAP libosmocore logging", "GSMTAP-LOG", "gsmtap_log");
 116         proto_register_field_array(proto_gsmtap_log, hf, array_length(hf));
 117         proto_register_subtree_array(ett, array_length(ett));
 118
 119         gsmtap_log_handle = register_dissector("gsmtap_log", dissect_gsmtap_log, proto_gsmtap_log);
 120 }
 121
 122 void
 123 proto_reg_handoff_gsmtap_log(void)
 124 {
 125         dissector_add_uint("gsmtap.type", GSMTAP_TYPE_OSMOCORE_LOG, gsmtap_log_handle);
 126 }
 127
 128 /*
 129  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 130  *
 131  * Local variables:
 132  * c-basic-offset: 8
 133  * tab-width: 8
 134  * indent-tabs-mode: t
 135  * End:
 136  *
 137  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 138  * :indentSize=8:tabSize=8:noTabs=false:
 139  */