netstat Service Detection

# SPDX-FileCopyrightText: 2015 SCHUTZWERK GmbH
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113758");
  script_version("2023-07-26T05:05:09+0000");
  script_tag(name:"last_modification", value:"2023-07-26 05:05:09 +0000 (Wed, 26 Jul 2023)");
  script_tag(name:"creation_date", value:"2015-11-06 18:00:00 +0100 (Fri, 06 Nov 2015)");

  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");

  script_name("netstat Service Detection");
  script_copyright("Copyright (C) 2015 SCHUTZWERK GmbH");
  script_category(ACT_GATHER_INFO);
  script_family("Service detection");
  script_dependencies("find_service2.nasl");
  script_require_ports("Services/netstat", 15);

  script_tag(name:"summary", value:"The script checks the presence of a netstat service.");

  script_tag(name:"qod_type", value:"remote_banner");

  exit(0);
}

include("host_details.inc");
include("port_service_func.inc");

port = service_get_port( proto: "netstat", default: 15 );
if( ! get_port_state( port ) ) exit( 0 );

soc = open_sock_tcp( port );
if( ! soc ) exit( 0 );

send( socket: soc, data: "TEST\r\n\r\n" );

buf = recv( socket: soc, length: 64 );
close( soc );

if( "Active Internet connections" >< buf || "Active connections" >< buf ||
     ( "ESTABLISHED" >< buf && "TCP" >< buf ) ) {
  service_register( port: port, proto: "netstat" );
  set_kb_item( name: "netstat/installed", value: TRUE );
  set_kb_item( name: "netstat/port", value: port );
  set_kb_item( name: "netstat/" + port + "/installed", value: TRUE );
  report = "The netstart service was detected on the target host.";
  log_message( data: report, port: port );
  exit( 0 );
}

exit( 99 );