#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include "protocol.h"
#include "server.h"
#include "connection.h"
#include "tcpprotocol.h"
TcpSocket::TcpSocket(
Protocol &protocol,
const Connection::Handle &connection,
const Server::Handle &server,
const Address &address,
int sockId
):
Socket(protocol, connection, server, address),
sockId(sockId)
{
int tcp_nodelay = 1;
setsockopt(sockId, IPPROTO_TCP, TCP_NODELAY, &tcp_nodelay, sizeof(int));
fcntl(sockId, F_SETFL, fcntl(sockId, F_GETFL, 0) | O_NONBLOCK);
struct epoll_event event = {};
event.data.ptr = this;
epoll_ctl(getProtocol().epollId, EPOLL_CTL_ADD, sockId, &event);
}
TcpProtocol::TcpProtocol():
thread(), stopping() { }
ErrorCode TcpProtocol::resolve(Address &address) {
if (address.type == Address::SOCKET)
return ERR_NONE;
if ( address.type != Address::COMMON_STRING
|| address.text.empty() )
return ERR_ADDRESS_INCORRECT;
// split to host and port
const char *addrString = address.text.c_str();
const char *colon = addrString;
while(*colon && *colon != ':') ++colon;
std::string hostBuf;
const char *host = nullptr;
const char *port = nullptr;
if (*colon) {
hostBuf.assign(addrString, colon);
host = hostBuf.c_str();
port = colon + 1;
} else {
bool allDigits = true;
for(const char *c = addrString; *c && allDigits; ++c)
if (*c < '0' || *c > '9') allDigits = false;
(allDigits ? port : host) = addrString;
}
// get ipv4
unsigned char ip[4] = {};
if (host) {
if (4 != sscanf(host, "%hhu.%hhu.%hhu.%hhu", &ip[0], &ip[1], &ip[2], &ip[3])) {
hostent *he;
in_addr **addr_list;
if ( (he = gethostbyname(host))
&& (addr_list = (struct in_addr**)he->h_addr_list)
&& (*addr_list) )
{
memcpy(ip, *addr_list, sizeof(ip));
} else {
return ERR_ADDRESS_NOT_FOUND;
}
}
}
unsigned short portNum = 0;
if (!port || 1 != sscanf(port, "%hu", &portNum) || !portNum)
return ERR_ADDRESS_INCORRECT;
address.set(Address::SOCKET);
sockaddr_in &addr = address.as<sockaddr_in>();
addr.sin_family = AF_INET;
memcpy(&addr.sin_addr, ip, sizeof(ip));
addr.sin_port = htons(portNum);
return ERR_NONE;
}
void TcpProtocol::threadRun() {
const int count = 1024;
struct epoll_event events[count] = {};
while(true) {
epoll_wait(epollId, events, count, 1000);
break;
}
closeAll();
}
ErrorCode TcpProtocol::connect(const Connection::Handle &connection, const Address &address) {
if (!thread) return ERR_PROTOCOL_NOT_INITIALIZED;
Address remoteAddres = address;
ErrorCode errorCode = resolve(remoteAddres);
if (errorCode) return errorCode;
Lock lock(mutex);
int sockId = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (0 != ::connect(sockId, &remoteAddres.as<sockaddr>(), remoteAddres.size)) {
::close(sockId);
return ERR_CONNECTION_FAILED;
}
TcpSocket *socket = new TcpSocket(*this, connection, nullptr, remoteAddres, sockId);
connection->open(socket);
return ERR_NONE;
}
ErrorCode TcpProtocol::listen(const Server::Handle &server, const Address &address) {
return ERR_NOT_IMPLEMENTED;
}
void TcpProtocol::start() {
stop();
epollId = ::epoll_create(32);
thread = new std::thread(&TcpProtocol::threadRun, this);
}
void TcpProtocol::stop() {
if (!thread) return;
{ Lock lock2(mutex); stopping = true; }
thread->join();
delete thread;
::close(epollId);
epollId = 0;
}