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// sock.h
#pragma once
#include <stdio.h>
#include <sstream>
#include "goodies.h"
#if defined(_WIN32)
#include <winsock2.h>
#include <ws2tcpip.h>
typedef int socklen_t;
inline int getLastError() { return WSAGetLastError(); }
inline void disableNagle(int sock) {
int x = 1;
if( setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *) &x, sizeof(x)) )
cout << "ERROR: disableNagle failed" << endl;
}
inline void prebindOptions( int sock ){
}
#else
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <errno.h>
inline void closesocket(int s) { close(s); }
const int INVALID_SOCKET = -1;
typedef int SOCKET;
#define h_errno errno
inline int getLastError() { return errno; }
inline void disableNagle(int sock) {
int x = 1;
#ifdef SOL_TCP
int level = SOL_TCP;
#else
int level = SOL_SOCKET;
#endif
if( setsockopt(sock, level, TCP_NODELAY, (char *) &x, sizeof(x)) )
cout << "ERROR: disableNagle failed" << endl;
}
inline void prebindOptions( int sock ){
cout << "doing prebind option" << endl;
int x = 1;
if ( setsockopt( sock , SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x)) < 0 )
cout << "Failed to set socket opt, SO_REUSEADDR" << endl;
}
#endif
struct SockAddr {
SockAddr() { addressSize = sizeof(sockaddr_in); memset(&sa, 0, sizeof(sa)); }
SockAddr(int sourcePort); /* listener side */
SockAddr(const char *ip, int port); /* EndPoint (remote) side, or if you want to specify which interface locally */
struct sockaddr_in sa;
socklen_t addressSize;
bool isLocalHost() const {
#if defined(_WIN32)
return sa.sin_addr.S_un.S_addr == 0x100007f;
#else
return sa.sin_addr.s_addr == 0x100007f;
#endif
}
string toString() {
stringstream out;
out << inet_ntoa(sa.sin_addr) << ':'
<< sa.sin_port;
return out.str();
}
unsigned getPort() { return sa.sin_port; }
bool operator==(const SockAddr& r) const {
return sa.sin_addr.s_addr == r.sa.sin_addr.s_addr &&
sa.sin_port == r.sa.sin_port;
}
bool operator!=(const SockAddr& r) const { return !(*this == r); }
bool operator<(const SockAddr& r) const {
if( sa.sin_port >= r.sa.sin_port )
return false;
return sa.sin_addr.s_addr < r.sa.sin_addr.s_addr;
}
};
const int MaxMTU = 16384;
class UDPConnection {
public:
UDPConnection() { sock = 0; }
~UDPConnection() { if( sock ) { closesocket(sock); sock = 0; } }
bool init(const SockAddr& myAddr);
int recvfrom(char *buf, int len, SockAddr& sender);
int sendto(char *buf, int len, const SockAddr& EndPoint);
int mtu(const SockAddr& sa) {
return sa.isLocalHost() ? 16384 : 1480;
}
SOCKET sock;
};
inline int UDPConnection::recvfrom(char *buf, int len, SockAddr& sender) {
return ::recvfrom(sock, buf, len, 0, (sockaddr *) &sender.sa, &sender.addressSize);
}
inline int UDPConnection::sendto(char *buf, int len, const SockAddr& EndPoint) {
if( 0 && rand() < (RAND_MAX>>4) ) {
cout << " NOTSENT ";
// cout << curTimeMillis() << " .TEST: NOT SENDING PACKET" << endl;
return 0;
}
return ::sendto(sock, buf, len, 0, (sockaddr *) &EndPoint.sa, EndPoint.addressSize);
}
inline bool UDPConnection::init(const SockAddr& myAddr) {
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if( sock == INVALID_SOCKET ) {
cout << "invalid socket? " << errno << endl;
return false;
}
//cout << sizeof(sockaddr_in) << ' ' << myAddr.addressSize << endl;
if( bind(sock, (sockaddr *) &myAddr.sa, myAddr.addressSize) != 0 ) {
cout << "udp init failed" << endl;
closesocket(sock);
sock = 0;
return false;
}
socklen_t optLen;
int rcvbuf;
if (getsockopt(sock,
SOL_SOCKET,
SO_RCVBUF,
(char*)&rcvbuf,
&optLen) != -1)
cout << "SO_RCVBUF:" << rcvbuf << endl;
return true;
}
inline SockAddr::SockAddr(int sourcePort) {
memset(sa.sin_zero, 0, sizeof(sa.sin_zero));
sa.sin_family = AF_INET;
sa.sin_port = htons(sourcePort);
sa.sin_addr.s_addr = htonl(INADDR_ANY);
addressSize = sizeof(sa);
}
inline SockAddr::SockAddr(const char *ip, int port) {
memset(sa.sin_zero, 0, sizeof(sa.sin_zero));
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
sa.sin_addr.s_addr = inet_addr(ip);
addressSize = sizeof(sa);
}
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