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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 "Socket.h"
#include <sys/types.h> // For data types #include <sys/types.h> // For data types
#include <sys/socket.h> // For socket(), connect(), send(), and recv() #include <sys/socket.h> // For socket(), connect(), send(), and recv()
#include <netdb.h> // For gethostbyname() #include <netdb.h> // For gethostbyname()
#include <arpa/inet.h> // For inet_addr() #include <arpa/inet.h> // For inet_addr()
#include <unistd.h> // For close() #include <unistd.h> // For close()
#include <netinet/in.h> // For sockaddr_in #include <netinet/in.h> // For sockaddr_in
#include <netinet/tcp.h> // TCP_KEEPCNT #include <netinet/tcp.h> // TCP_KEEPCNT
#include <fcntl.h> #include <fcntl.h>
typedef void raw_type; // Type used for raw data on this platform typedef void raw_type; // Type used for raw data on this platform
#include <errno.h> // For errno #include <errno.h> // For errno
@ -19,28 +19,34 @@ using namespace std;
// SocketException Code // SocketException Code
SocketException::SocketException(const string &message, bool inclSysMsg) SocketException::SocketException(const string &message, bool inclSysMsg)
: userMessage(message) { : userMessage(message)
if (inclSysMsg) { {
if (inclSysMsg)
{
userMessage.append(": "); userMessage.append(": ");
userMessage.append(strerror(errno)); userMessage.append(strerror(errno));
} }
} }
SocketException::~SocketException() noexcept (true) { SocketException::~SocketException() noexcept (true)
{
} }
const char *SocketException::what(){ const char *SocketException::what()
{
return userMessage.c_str(); return userMessage.c_str();
} }
// Function to fill in address structure given an address and port // Function to fill in address structure given an address and port
static void fillAddr(const string &address, unsigned short 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 memset(&addr, 0, sizeof(addr)); // Zero out address structure
addr.sin_family = AF_INET; // Internet address addr.sin_family = AF_INET; // Internet address
hostent *host; // Resolve name 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() // strerror() will not work for gethostbyname() and hstrerror()
// is supposedly obsolete // is supposedly obsolete
throw SocketException("Failed to resolve name (gethostbyname())"); throw SocketException("Failed to resolve name (gethostbyname())");
@ -52,15 +58,18 @@ static void fillAddr(const string &address, unsigned short port,
// Socket Code // Socket Code
Socket::Socket(int type, int protocol) { Socket::Socket(int type, int protocol)
{
// Make a new socket // 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); throw SocketException("Socket creation failed (socket())", true);
} }
} }
Socket::Socket(int sockDesc) { Socket::Socket(int sockDesc)
{
this->sockDesc = sockDesc; this->sockDesc = sockDesc;
} }
@ -70,27 +79,32 @@ Socket::~Socket()
sockDesc = -1; sockDesc = -1;
} }
string Socket::getLocalAddress() { string Socket::getLocalAddress()
{
sockaddr_in addr; sockaddr_in addr;
unsigned int addr_len = sizeof(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); throw SocketException("Fetch of local address failed (getsockname())", true);
} }
return inet_ntoa(addr.sin_addr); return inet_ntoa(addr.sin_addr);
} }
unsigned short Socket::getLocalPort() { unsigned short Socket::getLocalPort()
{
sockaddr_in addr; sockaddr_in addr;
unsigned int addr_len = sizeof(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); throw SocketException("Fetch of local port failed (getsockname())", true);
} }
return ntohs(addr.sin_port); return ntohs(addr.sin_port);
} }
void Socket::setLocalPort(unsigned short localPort) { void Socket::setLocalPort(unsigned short localPort)
{
// Bind the socket to its port // Bind the socket to its port
sockaddr_in localAddr; sockaddr_in localAddr;
memset(&localAddr, 0, sizeof(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_addr.s_addr = htonl(INADDR_ANY);
localAddr.sin_port = htons(localPort); 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); throw SocketException("Set of local port failed (bind())", true);
} }
} }
void Socket::setLocalAddressAndPort(const string &localAddress, void Socket::setLocalAddressAndPort(const string &localAddress,
unsigned short localPort) { unsigned short localPort)
{
// Get the address of the requested host // Get the address of the requested host
sockaddr_in localAddr; sockaddr_in localAddr;
fillAddr(localAddress, localPort, 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); throw SocketException("Set of local address and port failed (bind())", true);
} }
} }
@ -132,17 +149,21 @@ void Socket::setKeepalive()
void Socket::setBlocking(bool flag) void Socket::setBlocking(bool flag)
{ {
int flags = fcntl(sockDesc, F_GETFL, 0); int flags = fcntl(sockDesc, F_GETFL, 0);
if( !flag ) flags = flags | O_NONBLOCK; if( !flag )
else flags = flags & ~O_NONBLOCK; flags = flags | O_NONBLOCK;
else
flags = flags & ~O_NONBLOCK;
fcntl(sockDesc, F_SETFL, flags); fcntl(sockDesc, F_SETFL, flags);
} }
void Socket::cleanUp() { void Socket::cleanUp()
{
} }
unsigned short Socket::resolveService(const string &service, unsigned short Socket::resolveService(const string &service,
const string &protocol) { const string &protocol)
{
struct servent *serv; /* Structure containing service information */ struct servent *serv; /* Structure containing service information */
if ((serv = getservbyname(service.c_str(), protocol.c_str())) == NULL) if ((serv = getservbyname(service.c_str(), protocol.c_str())) == NULL)
@ -154,27 +175,32 @@ unsigned short Socket::resolveService(const string &service,
// CommunicatingSocket Code // CommunicatingSocket Code
CommunicatingSocket::CommunicatingSocket(int type, int protocol) 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, void CommunicatingSocket::connect(const string &foreignAddress,
unsigned short foreignPort) { unsigned short foreignPort)
{
// Get the address of the requested host // Get the address of the requested host
sockaddr_in destAddr; sockaddr_in destAddr;
fillAddr(foreignAddress, foreignPort, destAddr); fillAddr(foreignAddress, foreignPort, destAddr);
// Try to connect to the given port // 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); throw SocketException("Connect failed (connect())", true);
} }
} }
void CommunicatingSocket::send(const void *buffer, int bufferLen) 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); throw SocketException("Send failed (send())", true);
} }
} }
@ -184,29 +210,34 @@ int CommunicatingSocket::recv(void *buffer, int bufferLen)
int rtn; int rtn;
if ((rtn = ::recv(sockDesc, (raw_type *) buffer, bufferLen, MSG_DONTWAIT)) < 0 ) if ((rtn = ::recv(sockDesc, (raw_type *) buffer, bufferLen, MSG_DONTWAIT)) < 0 )
{ {
if(errno == EWOULDBLOCK || errno == EAGAIN) return -1; if(errno == EWOULDBLOCK || errno == EAGAIN)
else throw SocketException("Received failed (recv())", true); return -1;
else
throw SocketException("Received failed (recv())", true);
} }
return rtn; return rtn;
} }
string CommunicatingSocket::getForeignAddress() string CommunicatingSocket::getForeignAddress()
{ {
sockaddr_in addr; sockaddr_in addr;
unsigned int addr_len = sizeof(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); throw SocketException("Fetch of foreign address failed (getpeername())", true);
} }
return inet_ntoa(addr.sin_addr); return inet_ntoa(addr.sin_addr);
} }
unsigned short CommunicatingSocket::getForeignPort() { unsigned short CommunicatingSocket::getForeignPort()
{
sockaddr_in addr; sockaddr_in addr;
unsigned int addr_len = sizeof(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); throw SocketException("Fetch of foreign port failed (getpeername())", true);
} }
return ntohs(addr.sin_port); return ntohs(addr.sin_port);
@ -216,16 +247,20 @@ unsigned short CommunicatingSocket::getForeignPort() {
TCPSocket::TCPSocket() TCPSocket::TCPSocket()
: CommunicatingSocket(SOCK_STREAM, : CommunicatingSocket(SOCK_STREAM,
IPPROTO_TCP) { IPPROTO_TCP)
{
} }
TCPSocket::TCPSocket(const string &foreignAddress, unsigned short foreignPort, bool keepalive) TCPSocket::TCPSocket(const string &foreignAddress, unsigned short foreignPort, bool keepalive)
: CommunicatingSocket(SOCK_STREAM, IPPROTO_TCP) { : CommunicatingSocket(SOCK_STREAM, IPPROTO_TCP)
{
connect(foreignAddress, foreignPort); connect(foreignAddress, foreignPort);
if(keepalive) setKeepalive(); if(keepalive)
setKeepalive();
} }
TCPSocket::TCPSocket(int newConnSD) : CommunicatingSocket(newConnSD) { TCPSocket::TCPSocket(int newConnSD) : CommunicatingSocket(newConnSD)
{
} }
// TCPServerSocket Code // TCPServerSocket Code
@ -257,15 +292,18 @@ TCPSocket* TCPServerSocket::accept()
if(newConnSD > 0) if(newConnSD > 0)
{ {
newSocket = new TCPSocket(newConnSD); newSocket = new TCPSocket(newConnSD);
if(keepalive) newSocket->setKeepalive(); if(keepalive)
newSocket->setKeepalive();
} }
return newSocket; return newSocket;
} }
void TCPServerSocket::setListen(int queueLen) { void TCPServerSocket::setListen(int queueLen)
if (listen(sockDesc, queueLen) < 0) { {
if (listen(sockDesc, queueLen) < 0)
{
throw SocketException("Set listening socket failed (listen())", true); throw SocketException("Set listening socket failed (listen())", true);
} }
} }
@ -273,23 +311,27 @@ void TCPServerSocket::setListen(int queueLen) {
// UDPSocket Code // UDPSocket Code
UDPSocket::UDPSocket() : CommunicatingSocket(SOCK_DGRAM, UDPSocket::UDPSocket() : CommunicatingSocket(SOCK_DGRAM,
IPPROTO_UDP) { IPPROTO_UDP)
{
setBroadcast(); setBroadcast();
} }
UDPSocket::UDPSocket(unsigned short localPort) : UDPSocket::UDPSocket(unsigned short localPort) :
CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP) { CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP)
{
setLocalPort(localPort); setLocalPort(localPort);
setBroadcast(); setBroadcast();
} }
UDPSocket::UDPSocket(const string &localAddress, unsigned short localPort) UDPSocket::UDPSocket(const string &localAddress, unsigned short localPort)
: CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP) { : CommunicatingSocket(SOCK_DGRAM, IPPROTO_UDP)
{
setLocalAddressAndPort(localAddress, localPort); setLocalAddressAndPort(localAddress, localPort);
setBroadcast(); setBroadcast();
} }
void UDPSocket::setBroadcast() { void UDPSocket::setBroadcast()
{
// If this fails, we'll hear about it when we try to send. This will allow // 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 // system that cannot broadcast to continue if they don't plan to broadcast
int broadcastPermission = 1; int broadcastPermission = 1;
@ -297,14 +339,17 @@ void UDPSocket::setBroadcast() {
(raw_type *) &broadcastPermission, sizeof(broadcastPermission)); (raw_type *) &broadcastPermission, sizeof(broadcastPermission));
} }
void UDPSocket::disconnect() { void UDPSocket::disconnect()
{
sockaddr_in nullAddr; sockaddr_in nullAddr;
memset(&nullAddr, 0, sizeof(nullAddr)); memset(&nullAddr, 0, sizeof(nullAddr));
nullAddr.sin_family = AF_UNSPEC; nullAddr.sin_family = AF_UNSPEC;
// Try to disconnect // Try to disconnect
if (::connect(sockDesc, (sockaddr *) &nullAddr, sizeof(nullAddr)) < 0) { if (::connect(sockDesc, (sockaddr *) &nullAddr, sizeof(nullAddr)) < 0)
if (errno != EAFNOSUPPORT) { {
if (errno != EAFNOSUPPORT)
{
throw SocketException("Disconnect failed (connect())", true); throw SocketException("Disconnect failed (connect())", true);
} }
} }
@ -312,23 +357,26 @@ void UDPSocket::disconnect() {
void UDPSocket::sendTo(const void *buffer, int bufferLen, void UDPSocket::sendTo(const void *buffer, int bufferLen,
const string &foreignAddress, unsigned short foreignPort) const string &foreignAddress, unsigned short foreignPort)
{ {
sockaddr_in destAddr; sockaddr_in destAddr;
fillAddr(foreignAddress, foreignPort, destAddr); fillAddr(foreignAddress, foreignPort, destAddr);
// Write out the whole buffer as a single message. // Write out the whole buffer as a single message.
if (sendto(sockDesc, (raw_type *) buffer, bufferLen, 0, if (sendto(sockDesc, (raw_type *) buffer, bufferLen, 0,
(sockaddr *) &destAddr, sizeof(destAddr)) != bufferLen) { (sockaddr *) &destAddr, sizeof(destAddr)) != bufferLen)
{
throw SocketException("Send failed (sendto())", true); throw SocketException("Send failed (sendto())", true);
} }
} }
int UDPSocket::recvFrom(void *buffer, int bufferLen, string &sourceAddress, int UDPSocket::recvFrom(void *buffer, int bufferLen, string &sourceAddress,
unsigned short &sourcePort) { unsigned short &sourcePort)
{
sockaddr_in clntAddr; sockaddr_in clntAddr;
socklen_t addrLen = sizeof(clntAddr); socklen_t addrLen = sizeof(clntAddr);
int rtn; 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); throw SocketException("Receive failed (recvfrom())", true);
} }
@ -338,33 +386,39 @@ int UDPSocket::recvFrom(void *buffer, int bufferLen, string &sourceAddress,
return rtn; return rtn;
} }
void UDPSocket::setMulticastTTL(unsigned char multicastTTL) { void UDPSocket::setMulticastTTL(unsigned char multicastTTL)
{
if (setsockopt(sockDesc, IPPROTO_IP, IP_MULTICAST_TTL, 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); throw SocketException("Multicast TTL set failed (setsockopt())", true);
} }
} }
void UDPSocket::joinGroup(const string &multicastGroup) { void UDPSocket::joinGroup(const string &multicastGroup)
{
struct ip_mreq multicastRequest; struct ip_mreq multicastRequest;
multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str()); multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str());
multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY); multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
if (setsockopt(sockDesc, IPPROTO_IP, IP_ADD_MEMBERSHIP, if (setsockopt(sockDesc, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(raw_type *) &multicastRequest, (raw_type *) &multicastRequest,
sizeof(multicastRequest)) < 0) { sizeof(multicastRequest)) < 0)
{
throw SocketException("Multicast group join failed (setsockopt())", true); throw SocketException("Multicast group join failed (setsockopt())", true);
} }
} }
void UDPSocket::leaveGroup(const string &multicastGroup) { void UDPSocket::leaveGroup(const string &multicastGroup)
{
struct ip_mreq multicastRequest; struct ip_mreq multicastRequest;
multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str()); multicastRequest.imr_multiaddr.s_addr = inet_addr(multicastGroup.c_str());
multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY); multicastRequest.imr_interface.s_addr = htonl(INADDR_ANY);
if (setsockopt(sockDesc, IPPROTO_IP, IP_DROP_MEMBERSHIP, if (setsockopt(sockDesc, IPPROTO_IP, IP_DROP_MEMBERSHIP,
(raw_type *) &multicastRequest, (raw_type *) &multicastRequest,
sizeof(multicastRequest)) < 0) { sizeof(multicastRequest)) < 0)
{
throw SocketException("Multicast group leave failed (setsockopt())", true); 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. * Signals a problem with the execution of a socket call.
*/ */
class SocketException : public std::exception { class SocketException : public std::exception
{
public: public:
/** /**
* Construct a SocketException with a explanatory message. * Construct a SocketException with a explanatory message.
@ -37,7 +38,8 @@ private:
/** /**
* Base class representing basic communication endpoint * Base class representing basic communication endpoint
*/ */
class Socket { class Socket
{
public: public:
/** /**
* Close and deallocate this socket * Close and deallocate this socket
@ -118,7 +120,8 @@ protected:
/** /**
* Socket which is able to connect, send, and receive * Socket which is able to connect, send, and receive
*/ */
class CommunicatingSocket : public Socket { class CommunicatingSocket : public Socket
{
public: public:
/** /**
* Establish a socket connection with the given foreign * Establish a socket connection with the given foreign
@ -171,7 +174,8 @@ protected:
/** /**
* TCP socket for communication with other TCP sockets * TCP socket for communication with other TCP sockets
*/ */
class TCPSocket : public CommunicatingSocket { class TCPSocket : public CommunicatingSocket
{
public: public:
/** /**
* Construct a TCP socket with no connection * Construct a TCP socket with no connection
@ -200,7 +204,8 @@ private:
/** /**
* TCP socket class for servers * TCP socket class for servers
*/ */
class TCPServerSocket : public Socket { class TCPServerSocket : public Socket
{
public: public:
/** /**
* Construct a TCP socket for use with a server, accepting connections * Construct a TCP socket for use with a server, accepting connections
@ -241,7 +246,8 @@ private:
/** /**
* UDP socket class * UDP socket class
*/ */
class UDPSocket : public CommunicatingSocket { class UDPSocket : public CommunicatingSocket
{
public: public:
/** /**
* Construct a UDP socket * Construct a UDP socket