355 lines
12 KiB
C++
355 lines
12 KiB
C++
/// \file ddv_socket.cpp
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/// Holds all code for the DDV namespace.
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#include "ddv_socket.h"
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/// Create a new base socket. This is a basic constructor for converting any valid socket to a DDV::Socket.
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/// \param sockNo Integer representing the socket to convert.
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DDV::Socket::Socket(int sockNo){
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sock = sockNo;
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Error = false;
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Blocking = false;
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}//DDV::Socket basic constructor
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/// Create a new disconnected base socket. This is a basic constructor for placeholder purposes.
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/// A socket created like this is always disconnected and should/could be overwritten at some point.
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DDV::Socket::Socket(){
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sock = -1;
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Error = false;
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Blocking = false;
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}//DDV::Socket basic constructor
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/// Close connection. The internal socket is closed and then set to -1.
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void DDV::Socket::close(){
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#if DEBUG >= 3
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fprintf(stderr, "Socket closed.\n");
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#endif
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::close(sock);
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sock = -1;
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}//DDV::Socket::close
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/// Returns internal socket number.
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int DDV::Socket::getSocket(){return sock;}
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/// Create a new Unix Socket. This socket will (try to) connect to the given address right away.
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/// \param address String containing the location of the Unix socket to connect to.
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/// \param nonblock Whether the socket should be nonblocking. False by default.
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DDV::Socket::Socket(std::string address, bool nonblock){
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sock = socket(PF_UNIX, SOCK_STREAM, 0);
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if (sock < 0){
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#if DEBUG >= 1
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fprintf(stderr, "Could not create socket! Error: %s\n", strerror(errno));
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#endif
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return;
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}
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Error = false;
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Blocking = false;
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sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path, address.c_str(), address.size()+1);
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int r = connect(sock, (sockaddr*)&addr, sizeof(addr));
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if (r == 0){
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if (nonblock){
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int flags = fcntl(sock, F_GETFL, 0);
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flags |= O_NONBLOCK;
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fcntl(sock, F_SETFL, flags);
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}
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}else{
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#if DEBUG >= 1
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fprintf(stderr, "Could not connect to %s! Error: %s\n", address.c_str(), strerror(errno));
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#endif
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close();
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}
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}//DDV::Socket Unix Contructor
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/// Returns the ready-state for this socket.
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/// \returns 1 if data is waiting to be read, -1 if not connected, 0 otherwise.
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signed int DDV::Socket::ready(){
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if (sock < 0) return -1;
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char tmp;
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int preflags = fcntl(sock, F_GETFL, 0);
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int postflags = preflags | O_NONBLOCK;
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fcntl(sock, F_SETFL, postflags);
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int r = recv(sock, &tmp, 1, MSG_PEEK);
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fcntl(sock, F_SETFL, preflags);
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if (r < 0){
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if (errno == EAGAIN || errno == EWOULDBLOCK){
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return 0;
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}else{
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#if DEBUG >= 2
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fprintf(stderr, "Socket ready error! Error: %s\n", strerror(errno));
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#endif
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close();
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return -1;
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}
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}
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if (r == 0){
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close(); return -1;
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}
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return r;
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}
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/// Returns the connected-state for this socket.
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/// Note that this function might be slightly behind the real situation.
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/// The connection status is updated after every read/write attempt, when errors occur
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/// and when the socket is closed manually.
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/// \returns True if socket is connected, false otherwise.
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bool DDV::Socket::connected(){
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return (sock >= 0);
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}
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/// Writes data to socket. This function blocks if the socket is blocking and all data cannot be written right away.
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/// If the socket is nonblocking and not all data can be written, this function sets internal variable Blocking to true
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/// and returns false.
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/// \param buffer Location of the buffer to write from.
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/// \param len Amount of bytes to write.
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/// \returns True if the whole write was succesfull, false otherwise.
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bool DDV::Socket::write(const void * buffer, int len){
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int sofar = 0;
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if (sock < 0){return false;}
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while (sofar != len){
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int r = send(sock, (char*)buffer + sofar, len-sofar, 0);
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if (r <= 0){
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Error = true;
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#if DEBUG >= 2
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fprintf(stderr, "Could not write data! Error: %s\n", strerror(errno));
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#endif
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close();
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return false;
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}else{
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sofar += r;
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}
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}
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return true;
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}//DDv::Socket::write
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/// Reads data from socket. This function blocks if the socket is blocking and all data cannot be read right away.
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/// If the socket is nonblocking and not all data can be read, this function sets internal variable Blocking to true
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/// and returns false.
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/// \param buffer Location of the buffer to read to.
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/// \param len Amount of bytes to read.
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/// \returns True if the whole read was succesfull, false otherwise.
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bool DDV::Socket::read(void * buffer, int len){
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int sofar = 0;
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if (sock < 0){return false;}
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while (sofar != len){
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int r = recv(sock, (char*)buffer + sofar, len-sofar, 0);
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if (r <= 0){
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Error = true;
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#if DEBUG >= 2
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fprintf(stderr, "Could not read data! Error: %s\n", strerror(errno));
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#endif
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close();
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return false;
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}else{
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sofar += r;
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}
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}
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return true;
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}//DDV::Socket::read
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/// Read call that is compatible with file access syntax. This function simply calls the other read function.
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bool DDV::Socket::read(void * buffer, int width, int count){return read(buffer, width*count);}
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/// Write call that is compatible with file access syntax. This function simply calls the other write function.
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bool DDV::Socket::write(void * buffer, int width, int count){return write(buffer, width*count);}
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/// Write call that is compatible with std::string. This function simply calls the other write function.
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bool DDV::Socket::write(const std::string data){return write(data.c_str(), data.size());}
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/// Incremental write call. This function tries to write len bytes to the socket from the buffer,
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/// returning the amount of bytes it actually wrote.
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/// \param buffer Location of the buffer to write from.
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/// \param len Amount of bytes to write.
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/// \returns The amount of bytes actually written.
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int DDV::Socket::iwrite(void * buffer, int len){
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int r = send(sock, buffer, len, 0);
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if (r < 0){
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switch (errno){
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case EWOULDBLOCK: return 0; break;
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default:
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Error = true;
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#if DEBUG >= 2
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fprintf(stderr, "Could not iwrite data! Error: %s\n", strerror(errno));
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#endif
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close();
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return 0;
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break;
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}
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}
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if (r == 0){close();}
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return r;
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}//DDV::Socket::iwrite
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/// Incremental read call. This function tries to read len bytes to the buffer from the socket,
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/// returning the amount of bytes it actually read.
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/// \param buffer Location of the buffer to read to.
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/// \param len Amount of bytes to read.
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/// \returns The amount of bytes actually read.
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int DDV::Socket::iread(void * buffer, int len){
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int r = recv(sock, buffer, len, 0);
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if (r < 0){
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switch (errno){
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case EWOULDBLOCK: return 0; break;
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default:
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Error = true;
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#if DEBUG >= 2
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fprintf(stderr, "Could not iread data! Error: %s\n", strerror(errno));
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#endif
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close();
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return 0;
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break;
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}
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}
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if (r == 0){close();}
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return r;
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}//DDV::Socket::iread
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/// Read call that is compatible with std::string.
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/// Data is read using iread (which is nonblocking if the DDV::Socket itself is),
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/// then appended to end of buffer.
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/// \param buffer std::string to append data to.
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/// \return True if new data arrived, false otherwise.
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bool DDV::Socket::read(std::string & buffer){
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char cbuffer[5000];
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if (!read(cbuffer, 1)){return false;}
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int num = iread(cbuffer+1, 4999);
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if (num > 0){
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buffer.append(cbuffer, num+1);
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}else{
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buffer.append(cbuffer, 1);
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}
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return true;
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}//read
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/// Create a new base ServerSocket. The socket is never connected, and a placeholder for later connections.
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DDV::ServerSocket::ServerSocket(){
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sock = -1;
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}//DDV::ServerSocket base Constructor
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/// Create a new TCP ServerSocket. The socket is immediately bound and set to listen.
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/// A maximum of 100 connections will be accepted between accept() calls.
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/// Any further connections coming in will be dropped.
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/// \param port The TCP port to listen on
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/// \param hostname (optional) The interface to bind to. The default is 0.0.0.0 (all interfaces).
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/// \param nonblock (optional) Whether accept() calls will be nonblocking. Default is false (blocking).
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DDV::ServerSocket::ServerSocket(int port, std::string hostname, bool nonblock){
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock < 0){
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#if DEBUG >= 1
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fprintf(stderr, "Could not create socket! Error: %s\n", strerror(errno));
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#endif
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return;
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}
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int on = 1;
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setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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if (nonblock){
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int flags = fcntl(sock, F_GETFL, 0);
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flags |= O_NONBLOCK;
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fcntl(sock, F_SETFL, flags);
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}
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struct sockaddr_in addr;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);//set port
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inet_pton(AF_INET, hostname.c_str(), &addr.sin_addr);//set interface, 0.0.0.0 (default) is all
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int ret = bind(sock, (sockaddr*)&addr, sizeof(addr));//do the actual bind
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if (ret == 0){
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ret = listen(sock, 100);//start listening, backlog of 100 allowed
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if (ret == 0){
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return;
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}else{
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#if DEBUG >= 1
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fprintf(stderr, "Listen failed! Error: %s\n", strerror(errno));
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#endif
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close();
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return;
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}
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}else{
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#if DEBUG >= 1
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fprintf(stderr, "Binding failed! Error: %s\n", strerror(errno));
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#endif
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close();
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return;
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}
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}//DDV::ServerSocket TCP Constructor
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/// Create a new Unix ServerSocket. The socket is immediately bound and set to listen.
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/// A maximum of 100 connections will be accepted between accept() calls.
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/// Any further connections coming in will be dropped.
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/// The address used will first be unlinked - so it succeeds if the Unix socket already existed. Watch out for this behaviour - it will delete any file located at address!
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/// \param address The location of the Unix socket to bind to.
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/// \param nonblock (optional) Whether accept() calls will be nonblocking. Default is false (blocking).
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DDV::ServerSocket::ServerSocket(std::string address, bool nonblock){
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unlink(address.c_str());
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock < 0){
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#if DEBUG >= 1
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fprintf(stderr, "Could not create socket! Error: %s\n", strerror(errno));
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#endif
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return;
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}
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if (nonblock){
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int flags = fcntl(sock, F_GETFL, 0);
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flags |= O_NONBLOCK;
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fcntl(sock, F_SETFL, flags);
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}
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sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path, address.c_str(), address.size()+1);
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int ret = bind(sock, (sockaddr*)&addr, sizeof(addr));
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if (ret == 0){
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ret = listen(sock, 100);//start listening, backlog of 100 allowed
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if (ret == 0){
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return;
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}else{
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#if DEBUG >= 1
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fprintf(stderr, "Listen failed! Error: %s\n", strerror(errno));
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#endif
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close();
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return;
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}
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}else{
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#if DEBUG >= 1
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fprintf(stderr, "Binding failed! Error: %s\n", strerror(errno));
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#endif
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close();
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return;
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}
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}//DDV::ServerSocket Unix Constructor
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/// Accept any waiting connections. If the DDV::ServerSocket is blocking, this function will block until there is an incoming connection.
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/// If the DDV::ServerSocket is nonblocking, it might return a DDV::Socket that is not connected, so check for this.
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/// \param nonblock (optional) Whether the newly connected socket should be nonblocking. Default is false (blocking).
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/// \returns A DDV::Socket, which may or may not be connected, depending on settings and circumstances.
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DDV::Socket DDV::ServerSocket::accept(bool nonblock){
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if (sock < 0){return DDV::Socket(-1);}
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int r = ::accept(sock, 0, 0);
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//set the socket to be nonblocking, if requested.
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//we could do this through accept4 with a flag, but that call is non-standard...
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if ((r >= 0) && nonblock){
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int flags = fcntl(r, F_GETFL, 0);
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flags |= O_NONBLOCK;
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fcntl(r, F_SETFL, flags);
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}
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if (r < 0){
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if (errno != EWOULDBLOCK && errno != EAGAIN){close();}
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}
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return DDV::Socket(r);
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}
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/// Close connection. The internal socket is closed and then set to -1.
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void DDV::ServerSocket::close(){
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::close(sock);
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sock = -1;
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}//DDV::ServerSocket::close
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/// Returns the connected-state for this socket.
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/// Note that this function might be slightly behind the real situation.
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/// The connection status is updated after every accept attempt, when errors occur
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/// and when the socket is closed manually.
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/// \returns True if socket is connected, false otherwise.
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bool DDV::ServerSocket::connected(){
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return (sock >= 0);
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}//DDV::ServerSocket::connected
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/// Returns internal socket number.
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int DDV::ServerSocket::getSocket(){return sock;}
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