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Reformat socket

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This commit is contained in:
Carl Philipp Klemm 2026-04-01 11:41:28 +02:00
parent 7511e68c91
commit 4ea099db1a
2 changed files with 552 additions and 492 deletions
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184
Socket.cpp
View file

@ -2,15 +2,15 @@
#include "Socket.h"
#include <sys/types.h> // For data types
#include <sys/socket.h> // For socket(), connect(), send(), and recv()
#include <netdb.h> // For gethostbyname()
#include <arpa/inet.h> // For inet_addr()
#include <unistd.h> // For close()
#include <netinet/in.h> // For sockaddr_in
#include <netinet/tcp.h> // TCP_KEEPCNT
#include <fcntl.h>
typedef void raw_type; // Type used for raw data on this platform
#include <sys/types.h> // For data types
#include <sys/socket.h> // For socket(), connect(), send(), and recv()
#include <netdb.h> // For gethostbyname()
#include <arpa/inet.h> // For inet_addr()
#include <unistd.h> // For close()
#include <netinet/in.h> // For sockaddr_in
#include <netinet/tcp.h> // TCP_KEEPCNT
#include <fcntl.h>
typedef void raw_type; // Type used for raw data on this platform
#include <errno.h> // For errno
@ -19,28 +19,34 @@ using namespace std;
// SocketException Code
SocketException::SocketException(const string &message, bool inclSysMsg)
: userMessage(message) {
if (inclSysMsg) {
: userMessage(message)
{
if (inclSysMsg)
{
userMessage.append(": ");
userMessage.append(strerror(errno));
}
}
SocketException::~SocketException() noexcept (true) {
SocketException::~SocketException() noexcept (true)
{
}
const char *SocketException::what(){
const char *SocketException::what()
{
return userMessage.c_str();
}
// Function to fill in address structure given an address and port
static void fillAddr(const string &address, unsigned short port,
sockaddr_in &addr) {
sockaddr_in &addr)
{
memset(&addr, 0, sizeof(addr)); // Zero out address structure
addr.sin_family = AF_INET; // Internet address
hostent *host; // Resolve name
if ((host = gethostbyname(address.c_str())) == NULL) {
if ((host = gethostbyname(address.c_str())) == NULL)
{
// strerror() will not work for gethostbyname() and hstrerror()
// is supposedly obsolete
throw SocketException("Failed to resolve name (gethostbyname())");
@ -52,15 +58,18 @@ static void fillAddr(const string &address, unsigned short port,
// Socket Code
Socket::Socket(int type, int protocol) {
Socket::Socket(int type, int protocol)
{
// Make a new socket
if ((sockDesc = socket(PF_INET, type, protocol)) < 0) {
if ((sockDesc = socket(PF_INET, type, protocol)) < 0)
{
throw SocketException("Socket creation failed (socket())", true);
}
}
Socket::Socket(int sockDesc) {
Socket::Socket(int sockDesc)
{
this->sockDesc = sockDesc;
}
@ -70,27 +79,32 @@ Socket::~Socket()
sockDesc = -1;
}
string Socket::getLocalAddress() {
string Socket::getLocalAddress()
{
sockaddr_in addr;
unsigned int addr_len = sizeof(addr);
if (getsockname(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0) {
if (getsockname(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0)
{
throw SocketException("Fetch of local address failed (getsockname())", true);
}
return inet_ntoa(addr.sin_addr);
}
unsigned short Socket::getLocalPort() {
unsigned short Socket::getLocalPort()
{
sockaddr_in addr;
unsigned int addr_len = sizeof(addr);
if (getsockname(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0) {
if (getsockname(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0)
{
throw SocketException("Fetch of local port failed (getsockname())", true);
}
return ntohs(addr.sin_port);
}
void Socket::setLocalPort(unsigned short localPort) {
void Socket::setLocalPort(unsigned short localPort)
{
// Bind the socket to its port
sockaddr_in localAddr;
memset(&localAddr, 0, sizeof(localAddr));
@ -98,18 +112,21 @@ void Socket::setLocalPort(unsigned short localPort) {
localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
localAddr.sin_port = htons(localPort);
if (bind(sockDesc, (sockaddr *) &localAddr, sizeof(sockaddr_in)) < 0) {
if (bind(sockDesc, (sockaddr *) &localAddr, sizeof(sockaddr_in)) < 0)
{
throw SocketException("Set of local port failed (bind())", true);
}
}
void Socket::setLocalAddressAndPort(const string &localAddress,
unsigned short localPort) {
unsigned short localPort)
{
// Get the address of the requested host
sockaddr_in localAddr;
fillAddr(localAddress, localPort, localAddr);
if (bind(sockDesc, (sockaddr *) &localAddr, sizeof(sockaddr_in)) < 0) {
if (bind(sockDesc, (sockaddr *) &localAddr, sizeof(sockaddr_in)) < 0)
{
throw SocketException("Set of local address and port failed (bind())", true);
}
}
@ -132,17 +149,21 @@ void Socket::setKeepalive()
void Socket::setBlocking(bool flag)
{
int flags = fcntl(sockDesc, F_GETFL, 0);
if( !flag ) flags = flags | O_NONBLOCK;
else flags = flags & ~O_NONBLOCK;
if( !flag )
flags = flags | O_NONBLOCK;
else
flags = flags & ~O_NONBLOCK;
fcntl(sockDesc, F_SETFL, flags);
}
void Socket::cleanUp() {
void Socket::cleanUp()
{
}
unsigned short Socket::resolveService(const string &service,
const string &protocol) {
const string &protocol)
{
struct servent *serv; /* Structure containing service information */
if ((serv = getservbyname(service.c_str(), protocol.c_str())) == NULL)
@ -154,27 +175,32 @@ unsigned short Socket::resolveService(const string &service,
// CommunicatingSocket Code
CommunicatingSocket::CommunicatingSocket(int type, int protocol)
: Socket(type, protocol) {
: Socket(type, protocol)
{
}
CommunicatingSocket::CommunicatingSocket(int newConnSD) : Socket(newConnSD) {
CommunicatingSocket::CommunicatingSocket(int newConnSD) : Socket(newConnSD)
{
}
void CommunicatingSocket::connect(const string &foreignAddress,
unsigned short foreignPort) {
unsigned short foreignPort)
{
// Get the address of the requested host
sockaddr_in destAddr;
fillAddr(foreignAddress, foreignPort, destAddr);
// Try to connect to the given port
if (::connect(sockDesc, (sockaddr *) &destAddr, sizeof(destAddr)) < 0) {
if (::connect(sockDesc, (sockaddr *) &destAddr, sizeof(destAddr)) < 0)
{
throw SocketException("Connect failed (connect())", true);
}
}
void CommunicatingSocket::send(const void *buffer, int bufferLen)
{
if (::send(sockDesc, (raw_type *) buffer, bufferLen, 0) < 0)
{
if (::send(sockDesc, (raw_type *) buffer, bufferLen, 0) < 0) {
throw SocketException("Send failed (send())", true);
}
}
@ -184,29 +210,34 @@ int CommunicatingSocket::recv(void *buffer, int bufferLen)
int rtn;
if ((rtn = ::recv(sockDesc, (raw_type *) buffer, bufferLen, MSG_DONTWAIT)) < 0 )
{
if(errno == EWOULDBLOCK || errno == EAGAIN) return -1;
else throw SocketException("Received failed (recv())", true);
if(errno == EWOULDBLOCK || errno == EAGAIN)
return -1;
else
throw SocketException("Received failed (recv())", true);
}
return rtn;
}
string CommunicatingSocket::getForeignAddress()
{
{
sockaddr_in addr;
unsigned int addr_len = sizeof(addr);
if (getpeername(sockDesc, (sockaddr *) &addr,(socklen_t *) &addr_len) < 0) {
if (getpeername(sockDesc, (sockaddr *) &addr,(socklen_t *) &addr_len) < 0)
{
throw SocketException("Fetch of foreign address failed (getpeername())", true);
}
return inet_ntoa(addr.sin_addr);
}
unsigned short CommunicatingSocket::getForeignPort() {
unsigned short CommunicatingSocket::getForeignPort()
{
sockaddr_in addr;
unsigned int addr_len = sizeof(addr);
if (getpeername(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0) {
if (getpeername(sockDesc, (sockaddr *) &addr, (socklen_t *) &addr_len) < 0)
{
throw SocketException("Fetch of foreign port failed (getpeername())", true);
}
return ntohs(addr.sin_port);
@ -216,16 +247,20 @@ unsigned short CommunicatingSocket::getForeignPort() {
TCPSocket::TCPSocket()
: CommunicatingSocket(SOCK_STREAM,
IPPROTO_TCP) {
IPPROTO_TCP)
{
}
TCPSocket::TCPSocket(const string &foreignAddress, unsigned short foreignPort, bool keepalive)
: CommunicatingSocket(SOCK_STREAM, IPPROTO_TCP) {
: CommunicatingSocket(SOCK_STREAM, IPPROTO_TCP)
{
connect(foreignAddress, foreignPort);
if(keepalive) setKeepalive();
if(keepalive)
setKeepalive();
}
TCPSocket::TCPSocket(int newConnSD) : CommunicatingSocket(newConnSD) {
TCPSocket::TCPSocket(int newConnSD) : CommunicatingSocket(newConnSD)
{
}
// TCPServerSocket Code
@ -257,15 +292,18 @@ TCPSocket* TCPServerSocket::accept()
if(newConnSD > 0)
{
newSocket = new TCPSocket(newConnSD);
if(keepalive) newSocket->setKeepalive();
if(keepalive)
newSocket->setKeepalive();
}
return newSocket;
}
void TCPServerSocket::setListen(int queueLen) {
if (listen(sockDesc, queueLen) < 0) {
void TCPServerSocket::setListen(int queueLen)
{
if (listen(sockDesc, queueLen) < 0)
{
throw SocketException("Set listening socket failed (listen())", true);
}
}
@ -273,23 +311,27 @@ void TCPServerSocket::setListen(int queueLen) {
// UDPSocket Code
UDPSocket::UDPSocket() : CommunicatingSocket(SOCK_DGRAM,
IPPROTO_UDP) {
IPPROTO_UDP)
{
setBroadcast();
}
UDPSocket::UDPSocket(unsigned short localPort) :
CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP) {
CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP)
{
setLocalPort(localPort);
setBroadcast();
}
UDPSocket::UDPSocket(const string &localAddress, unsigned short localPort)
: CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP) {
: CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP)
{
setLocalAddressAndPort(localAddress, localPort);
setBroadcast();
}
void UDPSocket::setBroadcast() {
void UDPSocket::setBroadcast()
{
// If this fails, we'll hear about it when we try to send. This will allow
// system that cannot broadcast to continue if they don't plan to broadcast
int broadcastPermission = 1;
@ -297,14 +339,17 @@ void UDPSocket::setBroadcast() {
(raw_type *) &broadcastPermission, sizeof(broadcastPermission));
}
void UDPSocket::disconnect() {
void UDPSocket::disconnect()
{
sockaddr_in nullAddr;
memset(&nullAddr, 0, sizeof(nullAddr));
nullAddr.sin_family = AF_UNSPEC;
// Try to disconnect
if (::connect(sockDesc, (sockaddr *) &nullAddr, sizeof(nullAddr)) < 0) {
if (errno != EAFNOSUPPORT) {
if (::connect(sockDesc, (sockaddr *) &nullAddr, sizeof(nullAddr)) < 0)
{
if (errno != EAFNOSUPPORT)
{
throw SocketException("Disconnect failed (connect())", true);
}
}
@ -312,23 +357,26 @@ void UDPSocket::disconnect() {
void UDPSocket::sendTo(const void *buffer, int bufferLen,
const string &foreignAddress, unsigned short foreignPort)
{
{
sockaddr_in destAddr;
fillAddr(foreignAddress, foreignPort, destAddr);
// Write out the whole buffer as a single message.
if (sendto(sockDesc, (raw_type *) buffer, bufferLen, 0,
(sockaddr *) &destAddr, sizeof(destAddr)) != bufferLen) {
(sockaddr *) &destAddr, sizeof(destAddr)) != bufferLen)
{
throw SocketException("Send failed (sendto())", true);
}
}
int UDPSocket::recvFrom(void *buffer, int bufferLen, string &sourceAddress,
unsigned short &sourcePort) {
unsigned short &sourcePort)
{
sockaddr_in clntAddr;
socklen_t addrLen = sizeof(clntAddr);
int rtn;
if ((rtn = recvfrom(sockDesc, (raw_type *) buffer, bufferLen, MSG_DONTWAIT, (sockaddr *) &clntAddr, (socklen_t *) &addrLen)) < 0)
if ((rtn = recvfrom(sockDesc, (raw_type *) buffer, bufferLen, MSG_DONTWAIT, (sockaddr *) &clntAddr,
(socklen_t *) &addrLen)) < 0)
{
throw SocketException("Receive failed (recvfrom())", true);
}
@ -338,33 +386,39 @@ int UDPSocket::recvFrom(void *buffer, int bufferLen, string &sourceAddress,
return rtn;
}
void UDPSocket::setMulticastTTL(unsigned char multicastTTL) {
void UDPSocket::setMulticastTTL(unsigned char multicastTTL)
{
if (setsockopt(sockDesc, IPPROTO_IP, IP_MULTICAST_TTL,
(raw_type *) &multicastTTL, sizeof(multicastTTL)) < 0) {
(raw_type *) &multicastTTL, sizeof(multicastTTL)) < 0)
{
throw SocketException("Multicast TTL set failed (setsockopt())", true);
}
}
void UDPSocket::joinGroup(const string &multicastGroup) {
void UDPSocket::joinGroup(const string &multicastGroup)
{
struct ip_mreq multicastRequest;
multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str());
multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
if (setsockopt(sockDesc, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(raw_type *) &multicastRequest,
sizeof(multicastRequest)) < 0) {
sizeof(multicastRequest)) < 0)
{
throw SocketException("Multicast group join failed (setsockopt())", true);
}
}
void UDPSocket::leaveGroup(const string &multicastGroup) {
void UDPSocket::leaveGroup(const string &multicastGroup)
{
struct ip_mreq multicastRequest;
multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str());
multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
if (setsockopt(sockDesc, IPPROTO_IP, IP_DROP_MEMBERSHIP,
(raw_type *) &multicastRequest,
sizeof(multicastRequest)) < 0) {
sizeof(multicastRequest)) < 0)
{
throw SocketException("Multicast group leave failed (setsockopt())", true);
}
}

18
Socket.h
View file

@ -9,7 +9,8 @@
/**
* Signals a problem with the execution of a socket call.
*/
class SocketException : public std::exception {
class SocketException : public std::exception
{
public:
/**
* Construct a SocketException with a explanatory message.
@ -37,7 +38,8 @@ private:
/**
* Base class representing basic communication endpoint
*/
class Socket {
class Socket
{
public:
/**
* Close and deallocate this socket
@ -118,7 +120,8 @@ protected:
/**
* Socket which is able to connect, send, and receive
*/
class CommunicatingSocket : public Socket {
class CommunicatingSocket : public Socket
{
public:
/**
* Establish a socket connection with the given foreign
@ -171,7 +174,8 @@ protected:
/**
* TCP socket for communication with other TCP sockets
*/
class TCPSocket : public CommunicatingSocket {
class TCPSocket : public CommunicatingSocket
{
public:
/**
* Construct a TCP socket with no connection
@ -200,7 +204,8 @@ private:
/**
* TCP socket class for servers
*/
class TCPServerSocket : public Socket {
class TCPServerSocket : public Socket
{
public:
/**
* Construct a TCP socket for use with a server, accepting connections
@ -241,7 +246,8 @@ private:
/**
* UDP socket class
*/
class UDPSocket : public CommunicatingSocket {
class UDPSocket : public CommunicatingSocket
{
public:
/**
* Construct a UDP socket