235 lines
6.5 KiB
C++
235 lines
6.5 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS) project.
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* It is subject to the copyright notice and license terms in the
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* COPYRIGHT.t2t file found in the top-level directory of this
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* distribution and at
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* https://code.lm7.fr/mcy/owlps/src/master/COPYRIGHT.t2t
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* No part of the OwlPS Project, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms
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* contained in the COPYRIGHT.t2t file; the COPYRIGHT.t2t file must be
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* distributed along with this file, either separately or by replacing
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* this notice by the COPYRIGHT.t2t file's contents.
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*/
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#include "inputudpsocket.hh"
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#include "posexcept.hh"
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#include "stock.hh"
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#include "configuration.hh"
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#include <owlps.h>
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#include <iostream>
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#include <cstdio> // For perror()
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#include <unistd.h> // For close()
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#include <arpa/inet.h> // For inet_ntop()
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#include <unordered_map>
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using namespace std ;
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/* *** Constructors *** */
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InputUDPSocket::InputUDPSocket(const uint_fast16_t _port):
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listening_port(_port)
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{
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if (! init_socket())
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throw error_opening_input_file("UDP socket") ;
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}
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InputUDPSocket::~InputUDPSocket()
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{
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close_socket() ;
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}
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/* *** Operations *** */
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/**
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* @returns `true` if the socket were successfully opened.
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* @returns `false` in case of error.
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*/
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bool InputUDPSocket::init_socket()
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{
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sockfd = owl_create_udp_listening_socket(listening_port) ;
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return sockfd >= 0 ;
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}
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/**
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* Normally, the socket is closed automatically by the destructor. Use
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* this if you want to close the socket prematurely.
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* #sockfd is set to -1, even in case of error.
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* @returns `true` if the socket were successfully closed or were not
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* opened.
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* @returns `false` in case of error.
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*/
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bool InputUDPSocket::close_socket()
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{
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if (sockfd >= 0)
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{
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if (close(sockfd))
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{
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perror("Cannot close UDP socket") ;
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return false ;
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}
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sockfd = -1 ;
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}
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return true ;
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}
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/**
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* This function fills the current Request from the UDP input socket.
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*
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* @returns `true` if #current_request was correctly filled.
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* @returns `false` in case of error (socket not opened, bad packet
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* format).
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*/
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bool InputUDPSocket::fill_current_request()
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{
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if (eof())
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return false ;
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// Read the main request data
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owl_request request ;
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ssize_t nread = recvfrom(sockfd, &request, sizeof(request), 0,
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nullptr, nullptr) ;
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if (nread <= 0)
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{
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cerr << "InputUDPSocket: No request received!" << endl ;
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return false ;
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}
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// Endianess conversions
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request.nb_packets = ntohs(request.nb_packets) ;
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owl_ntoh_timestamp(&request.request_time) ;
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request.nb_info = ntohs(request.nb_info) ;
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request.x_position = owl_ntohf(request.x_position) ;
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request.y_position = owl_ntohf(request.y_position) ;
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request.z_position = owl_ntohf(request.z_position) ;
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// Mobile MAC
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string mac_mobile(
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owl_mac_bytes_to_string(request.mobile_mac_addr_bytes)) ;
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PosUtil::to_upper(mac_mobile) ;
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// Mobile IP
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char ip_mobile_str[INET_ADDRSTRLEN] ;
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inet_ntop(AF_INET, &request.mobile_ip_addr_bytes,
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ip_mobile_str, INET_ADDRSTRLEN) ;
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string ip_mobile(ip_mobile_str) ;
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PosUtil::to_upper(ip_mobile) ;
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// Display request's info
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if (Configuration::is_configured("verbose"))
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cerr
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<< "*** Request received from the aggregator ***"
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<< "\n\tType: " << static_cast<uint_fast16_t>(request.type)
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<< "\n\tNumber of packets: " << request.nb_packets
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<< "\n\tMobile MAC: " << mac_mobile
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<< "\n\tMobile IP: " << ip_mobile
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<< "\n\tRequest timestamp: " << Timestamp(request.request_time)
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<< "\n\tPosition X: " << request.x_position
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<< "\n\tPosition Y: " << request.y_position
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<< "\n\tPosition Z: " << request.z_position
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<< "\n\tDirection: "
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<< static_cast<uint_fast16_t>(request.direction)
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<< "\n\tNumber of SS: " << request.nb_info
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<< '\n' ;
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// Mobile MAC (continued)
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if (! Configuration::bool_value("positioning.accept-new-mobiles") &&
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! Stock::mobile_exists(mac_mobile))
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{
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if (Configuration::is_configured("verbose"))
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cerr << "Dropping request from unknown mobile "
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<< mac_mobile << ".\n" ;
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return false ;
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}
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const Mobile &mobile = Stock::find_create_mobile(mac_mobile) ;
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// Update the mobile's IP address:
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const_cast<Mobile&>(mobile).set_ip_addr(ip_mobile) ;
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current_request->set_mobile(&mobile) ;
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// Request type
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current_request->set_type(request.type) ;
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// Number of packets
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current_request->set_nb_packets(request.nb_packets) ;
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// Timestamp
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current_request->set_time_sent(Timestamp(request.request_time)) ;
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// Position
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Point3D position(request.x_position,
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request.y_position,
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request.z_position) ;
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// Read the {MAC_CP;SS} couples (request_info)
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unordered_map<string, Measurement> measurements ;
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owl_request_info request_info ;
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for (int i = 0 ; i < request.nb_info ; ++i)
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{
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nread = recvfrom(sockfd, &request_info, sizeof(request_info), 0,
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nullptr, nullptr) ;
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if (nread <= 0)
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{
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cerr << "No request info received!" << endl ;
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return false ;
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}
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pkt_id_t packet_id = ntohs(request_info.packet_id) ;
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string mac_cp(
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owl_mac_bytes_to_string(request_info.cp_mac_addr_bytes)) ;
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PosUtil::to_upper(mac_cp) ;
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owl_ntoh_timestamp(&request_info.capture_time) ;
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Timestamp capture_time(request_info.capture_time) ;
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ss_t ss = request_info.ss_dbm ;
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if (Configuration::is_configured("verbose"))
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cerr
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<< "\t* Packet received from the aggregator:"
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<< "\n\t\tPacket number: " << packet_id
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<< "\n\t\tCP MAC: " << mac_cp
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<< "\n\t\tCapture timestamp: " << capture_time
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<< "\n\t\tSignal: "
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<< ss << " dBm"
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<< '\n' ;
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if (! Configuration::bool_value("positioning.accept-new-cps") &&
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! Stock::cp_exists(mac_cp))
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{
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if (Configuration::is_configured("verbose"))
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cerr << "Dropping packet from unknown CP "
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<< mac_cp << ".\n" ;
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continue ;
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}
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const CapturePoint &cp = Stock::find_create_cp(mac_cp) ;
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measurements[mac_cp].set_cp(&cp) ;
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measurements[mac_cp].add_ss(packet_id, ss) ;
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}
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if (measurements.empty())
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return false ;
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current_request->set_measurements(measurements) ;
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// Calibration request?
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fill_calibration_request_data(
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mac_mobile, position, request.direction, request.type) ;
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return true ;
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}
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