LinHttpHandler.cpp
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/**
\file LinHttpHandler.cpp
Copyright Notice\n
Copyright (C) 2017 Jan Rogall - developer\n
Copyright (C) 2017 Moritz Wirger - developer\n
This file is part of hueplusplus.
hueplusplus is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
hueplusplus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with hueplusplus. If not, see <http://www.gnu.org/licenses/>.
**/
#include "hueplusplus/LinHttpHandler.h"
#include <chrono>
#include <cstring>
#include <iostream>
#include <memory>
#include <stdexcept>
#include <system_error>
#include <arpa/inet.h>
#include <netdb.h> // struct hostent, gethostbyname
#include <netinet/in.h> // struct sockaddr_in, struct sockaddr
#include <stdio.h> // printf, sprintf
#include <stdlib.h> // exit
#include <string.h> // functions for C style null-terminated strings
#include <sys/socket.h> // socket, connect
#include <unistd.h> // read, write, close
namespace hueplusplus
{
class SocketCloser
{
public:
explicit SocketCloser(int sockFd) : s(sockFd) {}
~SocketCloser() { close(s); }
private:
int s;
};
std::string LinHttpHandler::send(const std::string& msg, const std::string& adr, int port) const
{
// create socket
int socketFD = socket(AF_INET, SOCK_STREAM, 0);
SocketCloser closeMySocket(socketFD);
if (socketFD < 0)
{
int errCode = errno;
std::cerr << "LinHttpHandler: Failed to open socket: " << std::strerror(errCode) << "\n";
throw(std::system_error(errCode, std::generic_category(), "LinHttpHandler: Failed to open socket"));
}
// lookup ip address
hostent* server;
server = gethostbyname(adr.c_str());
if (server == NULL)
{
int errCode = errno;
std::cerr << "LinHttpHandler: Failed to find host with address " << adr << ": " << std::strerror(errCode)
<< "\n";
throw(std::system_error(errCode, std::generic_category(), "LinHttpHandler: gethostbyname"));
}
// fill in the structure
sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
memcpy(&server_addr.sin_addr.s_addr, server->h_addr, server->h_length);
// connect the socket
if (connect(socketFD, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0)
{
int errCode = errno;
std::cerr << "LinHttpHandler: Failed to connect socket: " << std::strerror(errCode) << "\n";
throw(std::system_error(errCode, std::generic_category(), "LinHttpHandler: Failed to connect socket"));
}
// send the request
size_t total = msg.length();
size_t sent = 0;
do
{
ssize_t bytes = write(socketFD, msg.c_str() + sent, total - sent);
if (bytes < 0)
{
int errCode = errno;
std::cerr << "LinHttpHandler: Failed to write message to socket: " << std::strerror(errCode) << "\n";
throw(std::system_error(
errCode, std::generic_category(), "LinHttpHandler: Failed to write message to socket"));
}
else if (bytes == 0)
{
break;
}
else
{
sent += bytes;
}
} while (sent < total);
// receive the response
std::string response;
char buffer[128] = {};
do
{
ssize_t bytes = read(socketFD, buffer, 127);
if (bytes < 0)
{
int errCode = errno;
std::cerr << "LinHttpHandler: Failed to read response from socket: " << std::strerror(errCode) << std::endl;
throw(std::system_error(
errCode, std::generic_category(), "LinHttpHandler: Failed to read response from socket"));
}
else if (bytes == 0)
{
break;
}
else
{
response.append(buffer, bytes);
}
} while (true);
return response;
}
std::vector<std::string> LinHttpHandler::sendMulticast(
const std::string& msg, const std::string& adr, int port, int timeout) const
{
hostent* server; // host information
sockaddr_in server_addr; // server address
// fill in the server's address and data
memset((char*)&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
// look up the address of the server given its name
server = gethostbyname(adr.c_str());
if (!server)
{
int errCode = errno;
std::cerr << "LinHttpHandler: sendMulticast: Failed to obtain address of " << msg << ": "
<< std::strerror(errCode) << "\n";
throw(std::system_error(
errCode, std::generic_category(), "LinHttpHandler: sendMulticast: Failed to obtain address of host"));
}
// put the host's address into the server address structure
memcpy((void*)&server_addr.sin_addr, server->h_addr_list[0], server->h_length);
// create the socket
int socketFD = socket(AF_INET, SOCK_DGRAM, 0);
SocketCloser closeMySendSocket(socketFD);
if (socketFD < 0)
{
int errCode = errno;
std::cerr << "LinHttpHandler: sendMulticast: Failed to open socket: " << std::strerror(errCode) << "\n";
throw(std::system_error(
errCode, std::generic_category(), "LinHttpHandler: sendMulticast: Failed to open socket"));
}
// send a message to the server
if (sendto(socketFD, msg.c_str(), strlen(msg.c_str()), 0, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0)
{
int errCode = errno;
std::cerr << "LinHttpHandler: sendMulticast: Failed to send message: " << std::strerror(errCode) << "\n";
throw(std::system_error(
errCode, std::generic_category(), "LinHttpHandler: sendMulticast: Failed to send message"));
}
std::string response;
char buffer[2048] = {}; // receive buffer
std::chrono::steady_clock::time_point start = std::chrono::steady_clock::now();
while (std::chrono::steady_clock::now() - start < std::chrono::seconds(timeout))
{
ssize_t bytesReceived = recv(socketFD, &buffer, 2048, MSG_DONTWAIT);
if (bytesReceived < 0)
{
int errCode = errno;
if (errCode != EAGAIN && errCode != EWOULDBLOCK)
{
std::cerr << "LinHttpHandler: sendMulticast: Failed to read response "
"from socket: "
<< std::strerror(errCode) << "\n";
throw(std::system_error(errCode, std::generic_category(),
"LinHttpHandler: sendMulticast: Failed to read "
"response from socket"));
}
continue;
}
if (bytesReceived)
{
response.append(buffer, bytesReceived);
}
}
// construct return vector
std::vector<std::string> returnString;
size_t pos = response.find("\r\n\r\n");
size_t prevpos = 0;
while (pos != std::string::npos)
{
returnString.push_back(response.substr(prevpos, pos - prevpos));
pos += 4;
prevpos = pos;
pos = response.find("\r\n\r\n", pos);
}
return returnString;
}
} // namespace hueplusplus