/* packet-gsmtap-log.c

 * Routines for GSMTAP logging packets

 *

 * (C) 2016 by Harald Welte <laforge@gnumonks.org>

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include "packet-gsmtap.h"

void proto_register_gsmtap_log(void);

void proto_reg_handoff_gsmtap_log(void);

static dissector_handle_t gsmtap_log_handle;

static int proto_gsmtap_log;

static int hf_log_ident;

static int hf_log_subsys;

static int hf_log_file_name;

static int hf_log_file_line;

static int hf_log_ts;

static int hf_log_pid;

static int hf_log_level;

static int hf_log_string;

static int ett_gsmtap_log;

/* from libosmocore include/osmocom/core/logging.h */

static const value_string gsmtap_log_levels[] = {

  { 1,  "DEBUG" },

  { 3,  "INFO" },

  { 5,  "NOTICE" },

  { 7,  "ERROR" },

  { 8,  "FATAL" },

  { 0, NULL }

};

/* dissect a GSMTAP header and hand payload off to respective dissector */

static int

dissect_gsmtap_log(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void * data _U_)

{

  proto_item *ti;

  proto_tree *log_tree;

  int offset = 0;

  int log_str_len;

  unsigned log_pid, log_level, log_src_line;

  const char *log_str;

  const uint8_t *log_ident, *log_subsys, *log_src_fname;

  ti = proto_tree_add_item(tree, proto_gsmtap_log, tvb, 0, -1, ENC_NA);

  log_tree = proto_item_add_subtree(ti, ett_gsmtap_log);

  proto_tree_add_item(log_tree, hf_log_ts, tvb, offset, 8, ENC_TIME_SECS_USECS|ENC_BIG_ENDIAN);

  offset += 8;

  proto_tree_add_item_ret_string(log_tree, hf_log_ident, tvb, offset, 16, ENC_NA, pinfo->pool, &log_ident);

  offset += 16;

  proto_tree_add_item_ret_uint(log_tree, hf_log_pid, tvb, offset, 4, ENC_BIG_ENDIAN, &log_pid);

  offset += 4;

  proto_tree_add_item_ret_uint(log_tree, hf_log_level, tvb, offset++, 1, ENC_NA, &log_level);

  offset += 3; /* pad octets */

  proto_tree_add_item_ret_string(log_tree, hf_log_subsys, tvb, offset, 16, ENC_NA, pinfo->pool, &log_subsys);

  offset += 16;

  proto_tree_add_item_ret_string(log_tree, hf_log_file_name, tvb, offset, 32, ENC_NA, pinfo->pool, &log_src_fname);

  offset += 32;

  proto_tree_add_item_ret_uint(log_tree, hf_log_file_line, tvb, offset, 4, ENC_BIG_ENDIAN, &log_src_line);

  offset += 4;

  /* actual log message */

  log_str_len = tvb_captured_length_remaining(tvb, offset);

  proto_tree_add_item(log_tree, hf_log_string, tvb, offset, log_str_len, ENC_ASCII);

  log_str = tvb_format_stringzpad_wsp(pinfo->pool, tvb, offset, log_str_len);

  col_append_str(pinfo->cinfo, COL_INFO, log_str);

  proto_item_append_text(ti, " %s(%u): %s/%d: %s:%u %s",

      log_ident, log_pid, log_subsys, log_level,

      log_src_fname, log_src_line, log_str);

  return tvb_captured_length(tvb);

}

void

proto_register_gsmtap_log(void)

{

  static hf_register_info hf[] = {

    { &hf_log_ident, { "Application", "gsmtap_log.ident",

      FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },

    { &hf_log_subsys, { "Subsystem", "gsmtap_log.subsys",

      FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },

    { &hf_log_file_name, { "Source File Name", "gsmtap_log.src_file.name",

      FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },

    { &hf_log_file_line, { "Source File Line Number", "gsmtap_log.src_file.line_nr",

      FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },

    { &hf_log_ts, { "Timestamp", "gsmtap_log.timestamp",

      FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0, NULL, HFILL } },

    { &hf_log_pid, { "Process ID", "gsmtap_log.pid",

      FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },

    { &hf_log_level, { "Log Level", "gsmtap_log.level",

      FT_UINT8, BASE_DEC, VALS(gsmtap_log_levels), 0, NULL, HFILL } },

    { &hf_log_string, { "String", "gsmtap_log.string",

      FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },

  };

  static int *ett[] = {

    &ett_gsmtap_log,

  };

  proto_gsmtap_log = proto_register_protocol("GSMTAP libosmocore logging", "GSMTAP-LOG", "gsmtap_log");

  proto_register_field_array(proto_gsmtap_log, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  gsmtap_log_handle = register_dissector("gsmtap_log", dissect_gsmtap_log, proto_gsmtap_log);

}

void

proto_reg_handoff_gsmtap_log(void)

{

  dissector_add_uint("gsmtap.type", GSMTAP_TYPE_OSMOCORE_LOG, gsmtap_log_handle);

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local variables:

 * c-basic-offset: 8

 * tab-width: 8

 * indent-tabs-mode: t

 * End:

 *

 * vi: set shiftwidth=8 tabstop=8 noexpandtab:

 * :indentSize=8:tabSize=8:noTabs=false:

 */