project_files/frontlib/socket.c
author alfadur
Wed, 25 Oct 2017 20:39:05 -0400
changeset 12766 a409da7276de
parent 10017 de822cd3df3a
permissions -rw-r--r--
jungle music
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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#include "socket.h"
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#include "util/logging.h"
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#include "util/util.h"
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#include <stdlib.h>
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#include <SDL_net.h>
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#include <time.h>
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struct _flib_tcpsocket {
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    TCPsocket sock;
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    SDLNet_SocketSet sockset;
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};
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struct _flib_acceptor {
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    TCPsocket sock;
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    uint16_t port;
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};
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static uint32_t getPeerIp(TCPsocket sock) {
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    IPaddress *addr = SDLNet_TCP_GetPeerAddress(sock);
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    return SDLNet_Read32(&addr->host);
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}
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static bool connectionIsLocal(TCPsocket sock) {
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    return getPeerIp(sock) == (uint32_t)((127UL<<24)+1); // 127.0.0.1
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}
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static flib_tcpsocket *createSocket(TCPsocket sdlsock) {
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    flib_tcpsocket *result = flib_calloc(1, sizeof(flib_tcpsocket));
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    if(result) {
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        result->sock = sdlsock;
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        result->sockset = SDLNet_AllocSocketSet(1);
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        if(!result->sockset) {
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            flib_log_e("Can't allocate socket: Out of memory!");
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            SDLNet_FreeSocketSet(result->sockset);
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            free(result);
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            result = NULL;
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        } else {
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            SDLNet_AddSocket(result->sockset, (SDLNet_GenericSocket)result->sock);
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        }
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    }
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    return result;
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}
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TCPsocket listen(uint16_t port) {
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    IPaddress addr;
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    addr.host = INADDR_ANY;
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    SDLNet_Write16(port, &addr.port);
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    TCPsocket sock = SDLNet_TCP_Open(&addr);
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    if(!sock) {
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        flib_log_w("Unable to listen on port %u: %s", (unsigned)port, SDLNet_GetError());
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    }
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    return sock;
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}
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flib_acceptor *flib_acceptor_create(uint16_t port) {
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    flib_acceptor *result = flib_calloc(1, sizeof(flib_acceptor));
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    if(result) {
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        if(port > 0) {
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            result->port = port;
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            result->sock = listen(result->port);
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        } else {
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            /* SDL_net does not seem to have a way to listen on a random unused port
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               and find out which port that is, so let's try to find one ourselves. */
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            srand(time(NULL));
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            for(int i=0; !result->sock && i<1000; i++) {
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                // IANA suggests using ports in the range 49152-65535 for things like this
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                result->port = 49152+(rand()%(65536-49152));
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                result->sock = listen(result->port);
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            }
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        }
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        if(!result->sock) {
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            flib_log_e("Failed to create acceptor.");
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            free(result);
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            result = NULL;
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        }
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    }
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    return result;
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}
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uint16_t flib_acceptor_listenport(flib_acceptor *acceptor) {
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    if(!acceptor) {
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        flib_log_e("Call to flib_acceptor_listenport with acceptor==null");
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        return 0;
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    }
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    return acceptor->port;
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}
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void flib_acceptor_close(flib_acceptor *acceptor) {
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    if(acceptor) {
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        SDLNet_TCP_Close(acceptor->sock);
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        free(acceptor);
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    }
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}
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flib_tcpsocket *flib_socket_accept(flib_acceptor *acceptor, bool localOnly) {
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    flib_tcpsocket *result = NULL;
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    if(!acceptor) {
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        flib_log_e("Call to flib_socket_accept with acceptor==null");
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    } else {
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        TCPsocket sock = NULL;
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        while(!result && (sock = SDLNet_TCP_Accept(acceptor->sock))) {
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            if(localOnly && !connectionIsLocal(sock)) {
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                flib_log_i("Rejected nonlocal connection attempt from %s", flib_format_ip(getPeerIp(sock)));
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            } else {
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                result = createSocket(sock);
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            }
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            if(!result) {
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                SDLNet_TCP_Close(sock);
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            }
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        }
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    }
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    return result;
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}
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flib_tcpsocket *flib_socket_connect(const char *host, uint16_t port) {
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    flib_tcpsocket *result = NULL;
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    if(!host || port==0) {
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        flib_log_e("Invalid parameter in flib_socket_connect");
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    } else {
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        IPaddress ip;
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        if(SDLNet_ResolveHost(&ip,host,port)==-1) {
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           flib_log_e("SDLNet_ResolveHost: %s\n", SDLNet_GetError());
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        } else {
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            TCPsocket sock=SDLNet_TCP_Open(&ip);
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            if(!sock) {
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                flib_log_e("SDLNet_TCP_Open: %s\n", SDLNet_GetError());
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            } else {
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                result = createSocket(sock);
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                if(result) {
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                    sock = NULL;
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                }
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            }
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            SDLNet_TCP_Close(sock);
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        }
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    }
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    return result;
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}
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void flib_socket_close(flib_tcpsocket *sock) {
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    if(sock) {
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        SDLNet_DelSocket(sock->sockset, (SDLNet_GenericSocket)sock->sock);
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        SDLNet_TCP_Close(sock->sock);
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        SDLNet_FreeSocketSet(sock->sockset);
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        free(sock);
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    }
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}
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int flib_socket_nbrecv(flib_tcpsocket *sock, void *data, int maxlen) {
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    if(!sock || (maxlen>0 && !data)) {
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        flib_log_e("Call to flib_socket_nbrecv with sock==null or data==null");
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        return -1;
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    }
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    int readySockets = SDLNet_CheckSockets(sock->sockset, 0);
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    if(readySockets>0) {
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        int size = SDLNet_TCP_Recv(sock->sock, data, maxlen);
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        return size>0 ? size : -1;
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    } else if(readySockets==0) {
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        return 0;
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    } else {
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        flib_log_e("Error in select system call: %s", SDLNet_GetError());
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        return -1;
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    }
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}
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int flib_socket_send(flib_tcpsocket *sock, const void *data, int len) {
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    if(!sock || (len>0 && !data)) {
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        flib_log_e("Call to flib_socket_send with sock==null or data==null");
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        return -1;
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    }
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    return SDLNet_TCP_Send(sock->sock, data, len);
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}