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#include <netdb.h>
#include <unistd.h>
#include <chrono>
#include <Port.hh>
#include <sys/ioctl.h>
#include <net/if.h>
udp_layer::udp_layer(const std::string & p_type, const std::string & param) : layer(p_type), PORT(p_type.c_str()), _params(), _saddr{0}, _daddr{0}, _reuse_incoming_source_adddress(false), _fd(-1), _time_key("udp_layer::Handle_Fd_Event_Readable") {
loggers::get_instance().log(">>> udp_layer::udp_layer: %s, %s", to_string().c_str(), param.c_str());
// Setup parameters
params::convert(_params, param);
params::const_iterator it = _params.find("src_ip");
if (it == _params.cend()) {
_params.insert(std::pair<std::string, std::string>(std::string("src_ip"), "127.0.0.1"));
}
it = _params.find("src_port");
if (it == _params.cend()) {
_params.insert(std::pair<std::string, std::string>(std::string("src_port"), "0")); // Dynamic binding requested
}
it = _params.find("dst_ip");
if (it == _params.cend()) {
_params.insert(std::pair<std::string, std::string>(std::string("dst_ip"), "127.0.0.1"));
}
it = _params.find("dst_port");
if (it == _params.cend()) {
_params.insert(std::pair<std::string, std::string>(std::string("dst_port"), "12345"));
it = _params.find("reuse_incoming_source_adddress");
if (it != _params.cend()) {
_reuse_incoming_source_adddress = (boolean)(it->second.compare("1") == 0);
}
loggers::get_instance().log("udp_layer::udp_layer: _reuse_incoming_source_adddress: %d", _reuse_incoming_source_adddress);
// Initialize the socket
_saddr.sin_family = AF_INET;
_saddr.sin_addr.s_addr = htonl(INADDR_ANY);
loggers::get_instance().log("udp_layer::udp_layer: Port to listen=%d", std::atoi(_params["src_port"].c_str()));
_saddr.sin_port = htons(std::atoi(_params["src_port"].c_str()));
// Create socket
_fd = ::socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (_fd == -1) {
loggers::get_instance().error("udp_layer::udp_layer: Failed to create socket");
}
loggers::get_instance().log("udp_layer::udp_layer: socket id: %d", _fd);
int reuse = 1;
if (::setsockopt(_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
loggers::get_instance().warning("udp_layer::udp_layer: Failed to set SO_REUSEADDR");
}
// Bind it
/*struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "eth1");
if (setsockopt(_fd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr.ifr_name, strlen(ifr.ifr_name)) < 0) {
close();
loggers::get_instance().error("udp_layer::udp_layer: Failed to bind socket to %s", ifr.ifr_name);
}
loggers::get_instance().log("udp_layer::udp_layer: Bound to device %s", ifr.ifr_name);*/
if(::bind(_fd, (struct sockaddr *)&_saddr, sizeof(_saddr)) < 0) {
close();
loggers::get_instance().error("udp_layer::udp_layer: Failed to bind socket");
}
loggers::get_instance().log("udp_layer::udp_layer: Bound on port %s", _params["src_port"].c_str());
// Pass the device file handler to the polling procedure
Handler_Add_Fd_Read(_fd);
_daddr.sin_family = AF_INET;
_daddr.sin_addr.s_addr = ::htonl(get_host_id(_params["dst_ip"]));
_daddr.sin_port = ::htons(std::atoi(_params["dst_port"].c_str()));
}
udp_layer::~udp_layer() {
loggers::get_instance().log(">>> udp_layer::~udp_layer");
close();
}
void udp_layer::close() {
loggers::get_instance().log(">>> udp_layer::close: %d", _fd);
if (_fd != -1) {
::close(_fd);
_fd = -1;
}
}
void udp_layer::send_data(OCTETSTRING& data, params& params) {
loggers::get_instance().log_msg(">>> udp_layer::send_data: ", data);
int result = ::sendto(_fd, (const char*)static_cast<const unsigned char*>(data), data.lengthof(), 0, (struct sockaddr*)&_daddr, sizeof(_daddr));
loggers::get_instance().log("udp_layer::send_data: #bytes sent: %d to %s:%d", result, ::inet_ntoa(_daddr.sin_addr), ntohs(_daddr.sin_port));
}
void udp_layer::receive_data(OCTETSTRING& data, params& params) {
loggers::get_instance().log_msg(">>> udp_layer::receive_data: ", data);
receive_to_all_layers(data, params);
}
void udp_layer::Handle_Fd_Event_Readable(int fd) {
loggers::get_instance().log(">>> udp_layer::Handle_Fd_Event_Readable: %d", fd);
socklen_t len = sizeof(struct sockaddr_in); // Length of sender's address
std::vector<unsigned char> acc;
int result = ::recvfrom(_fd, buffer, 3072, 0, (struct sockaddr *)&from, &len);
loggers::get_instance().log("udp_layer::Handle_Fd_Event_Readable: src_port = %s:%d, payload length = %d, errno = %d", ::inet_ntoa(from.sin_addr), ntohs(from.sin_port), result, errno);
while ((result == 3072) && (errno == 0)) {
std::copy((unsigned char*)buffer, (unsigned char*)((unsigned char*)buffer + result), std::back_inserter(acc));
result = ::recvfrom(_fd, buffer, 3072, 0, (struct sockaddr *)&from, &len);
loggers::get_instance().log("udp_layer::Handle_Fd_Event_Readable: src_port = %s:%d, payload length = %d, errno = %d", ::inet_ntoa(from.sin_addr), ntohs(from.sin_port), result, errno);
} // End of 'while' statement
if (errno < 0) {
loggers::get_instance().warning("udp_layer::Handle_Fd_Event_Readable: Failed to read data, discard them: errno=%d", errno);
} else {
std::copy((unsigned char*)buffer, (unsigned char*)((unsigned char*)buffer + result), std::back_inserter(acc));
if (_reuse_incoming_source_adddress) { // Reuse the incoming address/port for sending
memcpy((void*)&_daddr, (const void*)&from, sizeof(struct sockaddr_in));
loggers::get_instance().log("udp_layer::Handle_Fd_Event_Readable: New _daddr: %s:%d", ::inet_ntoa(_daddr.sin_addr), ntohs(_daddr.sin_port));
}
params.insert(std::pair<std::string, std::string>(std::string("timestamp"), std::to_string(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count())));
float duration;
loggers::get_instance().set_start_time(_time_key);
receive_data(os, params); // TODO Check execution time for decoding operation
loggers::get_instance().set_stop_time(_time_key, duration);
}
unsigned long udp_layer::get_host_id(const std::string& p_host_name) {
loggers::get_instance().log(">>> udp_layer::get_host_id");
if (p_host_name.empty()) {
loggers::get_instance().warning("udp_layer::get_host_id: Wrong parameter");
unsigned long ip_addr = 0;
if(p_host_name.compare("255.255.255.255") == 0) {
loggers::get_instance().warning("udp_layer::get_host_id: Host ip is 255.255.255.255");
ip_addr = 0xffffffff;
} else {
in_addr_t addr = ::inet_addr(p_host_name.c_str());
if (addr != (in_addr_t)-1) { // host name in XX:XX:XX:XX form
ip_addr = addr;
} else { // host name in domain.com form
struct hostent* hptr;
if ((hptr = ::gethostbyname(p_host_name.c_str())) == 0) {
close();
loggers::get_instance().error("udp_layer::get_host_id: Invalid host name: %s", p_host_name.c_str());
}
ip_addr = *((unsigned long*)hptr->h_addr_list[0]);
loggers::get_instance().log("udp_layer::get_host_id: Host name: %s, Host address: %u", p_host_name.c_str(), ip_addr);
}
udp_layer_factory udp_layer_factory::_f;