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SRB2/tools/masterserver/ipcs.cpp

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2014-03-15 16:59:03 +00:00
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright (C) 2000 by DooM Legacy Team.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
//-----------------------------------------------------------------------------
#ifdef __GNUC__
#include <unistd.h>
#endif
#ifdef _WIN32
//#include <winsock.h>
#else
#include <sys/types.h> // socket(),...
#include <sys/socket.h> // socket(),...
#endif
#include <stdlib.h> // atoi(),...
#include <signal.h> // signal(),...
#ifndef _WIN32
#include <netdb.h> // gethostbyname(),...
#endif
#ifdef _WIN32
#include <time.h>
#else
#include <sys/time.h> // timeval,... (TIMEOUT)
#endif
#include <string.h> // memset(),...
#include "ipcs.h"
#include "common.h"
typedef void Sigfunc(int);
#ifndef _WIN32
static void sigHandler(int signr);
static Sigfunc *mySignal(int signo, Sigfunc *func);
#endif
#ifdef _MSC_VER
#pragma warning(disable : 4127)
#endif
//=============================================================================
#if defined (_WIN32) || defined (__OS2__)
// it seems windows doesn't define that... maybe some other OS? OS/2
static int inet_aton(const char *hostname, struct in_addr *addr)
{
return ((addr->s_addr=inet_addr(hostname)) != INADDR_NONE);
}
#endif
/*
** CSocket()
*/
CSocket::CSocket()
{
dbgPrintf(DEFCOL, "Initializing socket... ");
#ifdef _WIN32
//#warning SIGPIPE needed
WSADATA winsockdata;
if (WSAStartup(MAKEWORD(1, 1), &winsockdata))
conPrintf(RED,"No TCP/IP driver detected");
#else
signal(SIGPIPE, sigHandler);
#endif
FD_ZERO(&rset);
memset(&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
dbgPrintf(DEFCOL, "DONE1.\n");
}
/*
** ~CSocket()
*/
CSocket::~CSocket()
{
dbgPrintf(DEFCOL, "Freeing socket... ");
#ifdef _WIN32
WSACleanup();
#endif
dbgPrintf(DEFCOL, "DONE2.\n");
}
/*
** getIP()
*/
int CSocket::getIP(const char *ip_addr)
{
struct hostent *host_ent;
dbgPrintf(DEFCOL, "get IP for %s... ", ip_addr);
if (!inet_aton(ip_addr, &addr.sin_addr))
{
host_ent = gethostbyname(ip_addr);
if (host_ent == NULL)
return GETHOSTBYNAME_ERROR;
memcpy(&addr.sin_addr, host_ent->h_addr_list[0],
sizeof (struct in_addr));
}
dbgPrintf(DEFCOL, "got %s. ", inet_ntoa(addr.sin_addr));
dbgPrintf(DEFCOL, "DONE3.\n");
return 0;
}
/*
** CClientSocket()
*/
CClientSocket::CClientSocket()
{
dbgPrintf(DEFCOL, "Initializing client socket... ");
socket_fd = (SOCKET)-1;
dbgPrintf(DEFCOL, "DONE4.\n");
}
/*
** ~CClientSocket()
*/
CClientSocket::~CClientSocket()
{
dbgPrintf(DEFCOL, "Freeing client socket... ");
if (socket_fd != (SOCKET)-1)
close(socket_fd);
dbgPrintf(DEFCOL, "DONE5.\n");
}
/*
** connect()
*/
int CClientSocket::connect(const char *ip_addr, const char *str_port)
{
dbgPrintf(DEFCOL, "Connect to %s %s...\n", ip_addr, str_port);
// put that in the constructor?
if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0)) == (SOCKET)-1)
return SOCKET_ERROR;
if (getIP(ip_addr) == GETHOSTBYNAME_ERROR)
return GETHOSTBYNAME_ERROR;
addr.sin_port = htons(atoi(str_port));
if (::connect(socket_fd, (struct sockaddr *) &addr, sizeof (addr)) < 0)
return CONNECT_ERROR;
FD_SET(socket_fd, &rset);
dbgPrintf(DEFCOL, "DONE6.\n");
return 0;
}
/*
* write()
*/
int CClientSocket::write(msg_t *msg)
{
int len;
if (msg->length < 0)
msg->length = (INT32)strlen(msg->buffer);
if (msg->length > PACKET_SIZE)
return WRITE_ERROR; // too big
len = msg->length + HEADER_SIZE;
msg->id = htonl(msg->id);
msg->type = htonl(msg->type);
msg->length = htonl(msg->length);
msg->room = htonl(msg->room);
dbgPrintf(DEFCOL, "Write a message %d (%s)... ", len, msg->buffer);
if (send(socket_fd, (const char *)msg, len, 0) != len)
return WRITE_ERROR;
dbgPrintf(DEFCOL, "DONE7.\n");
return 0;
}
/*
* read()
*/
int CClientSocket::read(msg_t *msg)
{
struct timeval timeout;
fd_set tset;
dbgPrintf(DEFCOL, "Waiting a message... ");
timeout.tv_sec = 60, timeout.tv_usec = 0;
memcpy(&tset, &rset, sizeof (tset));
if ((select(255, &tset, NULL, NULL, &timeout)) <= 0)
return TIMEOUT_ERROR;
if (!FD_ISSET(socket_fd, &tset))
return READ_ERROR;
dbgPrintf(DEFCOL, "Reading a message.\n");
if (recv(socket_fd, (char *)msg, HEADER_SIZE, 0) != HEADER_SIZE)
return READ_ERROR;
msg->id = ntohl(msg->id);
msg->type = ntohl(msg->type);
msg->length = ntohl(msg->length);
msg->room = ntohl(msg->room);
if (!msg->length) // work around a bug in Windows 2000
return 0;
if (msg->length > PACKET_SIZE)
return READ_ERROR; // packet too big
if (recv(socket_fd, msg->buffer, msg->length, 0) != msg->length)
return READ_ERROR;
dbgPrintf(DEFCOL, "DONE8.\n");
return 0;
}
/*
** CServerSocket()
*/
CServerSocket::CServerSocket()
{
size_t id;
dbgPrintf(DEFCOL, "Initializing server socket... ");
num_clients = 0;
accept_fd = udp_fd = (SOCKET)-1;
for (id = 0; id < MAX_CLIENT; id++)
client_fd[id] = (SOCKET)-1;
udp_addr.sin_family = AF_INET;
dbgPrintf(DEFCOL, "DONE9.\n");
}
/*
** ~CServerSocket()
*/
CServerSocket::~CServerSocket()
{
size_t id;
dbgPrintf(DEFCOL, "Freeing server socket... ");
if (udp_fd != (SOCKET)-1)
close(udp_fd);
if (accept_fd != (SOCKET)-1)
close(accept_fd);
for (id = 0; id < num_clients || id < MAX_CLIENT; id++)
if (client_fd[id] != (SOCKET)-1)
close(client_fd[id]);
dbgPrintf(DEFCOL, "DONE10.\n");
}
/*
** listen()
*/
int CServerSocket::listen(const char *str_port)
{
dbgPrintf(DEFCOL, "Listen on %s... ", str_port);
// Init TCP socket
if ((accept_fd = socket(AF_INET, SOCK_STREAM, 0)) == (SOCKET)-1)
return SOCKET_ERROR;
int one = 1; setsockopt(accept_fd, SOL_SOCKET, SO_REUSEADDR, (char*)&one, sizeof(int));
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(atoi(str_port));
if (bind(accept_fd, (struct sockaddr *) &addr, sizeof (addr)) < 0)
return BIND_ERROR;
if (::listen(accept_fd, 5) < 0)
return LISTEN_ERROR;
FD_SET(accept_fd, &rset);
// Init UDP socket
if ((udp_fd = socket(AF_INET, SOCK_DGRAM, 0)) == (SOCKET)-1)
return SOCKET_ERROR;
udp_addr.sin_addr.s_addr = htonl(INADDR_ANY);
udp_addr.sin_port = htons(atoi(str_port)+1);
if (bind(udp_fd, (struct sockaddr *) &udp_addr, sizeof (udp_addr)) < 0)
return BIND_ERROR;
FD_SET(udp_fd, &rset);
dbgPrintf(DEFCOL, "DONE11.\n");
return 0;
}
/*
* deleteClient():
*/
int CServerSocket::deleteClient(size_t id)
{
dbgPrintf(DEFCOL, "Deleting (client %u) of %u... ", id+1, num_clients);
FD_CLR(client_fd[id], &rset);
close(client_fd[id]);
if (num_clients != 0)
num_clients--;
client_fd[id] = client_fd[num_clients]; // move the top socket into this now empty space
memmove(&client_addr[id], &client_addr[num_clients], sizeof (client_addr[num_clients]));
client_fd[num_clients] = (SOCKET)-1; // now empty the top socket
memset(&client_addr[num_clients], 0 , sizeof (client_addr[num_clients]));
dbgPrintf(DEFCOL, "DONE12.\n");
return 0;
}
/*
* getUdpIP()
*/
const char *CServerSocket::getUdpIP(void)
{
return inet_ntoa(udp_in_addr.sin_addr);
}
/*
* getUdpPort()
*/
const char *CServerSocket::getUdpPort(bool offset)
{
static char buffer[8];
UINT16 port = htons(udp_in_addr.sin_port);
if (offset)
port--;
snprintf(buffer, sizeof buffer, "%d", port);
return buffer;
}
/*
* read(): wait message on a socket, if it's an accept, call the accept method,
* otherwise read the message and update msg->id to the right value
* (client cannot put valid entry in msg->id)
*/
int CServerSocket::read(msg_t *msg)
{
struct timeval timeout;
fd_set tset;
UINT32 id;
socklen_t lg = sizeof (addr);
timeout.tv_sec = 20, timeout.tv_usec = 0;
memcpy(&tset, &rset, sizeof (tset));
if ((select(255, &tset, NULL, NULL, &timeout)) <= 0)
{
msg->type = TIMEOUT_MSG;
return TIMEOUT_ERROR;
}
if (FD_ISSET(udp_fd, &tset))
{
msg->type = UDP_RECV_MSG; // This is a UDP packet
msg->length = recvfrom(udp_fd, msg->buffer, PACKET_SIZE, 0, (struct sockaddr *)&udp_in_addr, &lg);
return 0;
}
if (FD_ISSET(accept_fd, &tset))
{
msg->type = ACCEPT_MSG;
return this->accept();
}
id = 0;
while (!FD_ISSET(client_fd[id], &tset) && id < MAX_CLIENT)
id++;
// paranoia
if ( (id >= num_clients) || (id >= MAX_CLIENT) )
{
dbgPrintf(DEFCOL, "This should never happen\n");
return READ_ERROR;
}
dbgPrintf(DEFCOL, "Reading a message from (socket %u) for (client %u)... ", client_fd[id], id+1);
if (recv(client_fd[id], (char *)msg, HEADER_SIZE, 0) != HEADER_SIZE)
{
deleteClient(id); // the connection is not good with the client, kick him
return READ_ERROR;
}
//msg->id = ntohl(msg->id); // see comment above
msg->type = ntohl(msg->type);
msg->length = ntohl(msg->length);
msg->room = ntohl(msg->room);
if ((0 < msg->length) && (msg->length < PACKET_SIZE))
{
timeout.tv_sec = 0, timeout.tv_usec = 0; // the info should be already in the socket, so don't wait
memcpy(&tset, &rset, sizeof (tset));
if ((select(255, &tset, NULL, NULL, &timeout)) <= 0)
{
deleteClient(id);
return READ_ERROR;
}
if (!FD_ISSET(client_fd[id], &tset))
{
deleteClient(id);
return READ_ERROR;
}
if (recv(client_fd[id], msg->buffer, msg->length, 0) != msg->length)
{
deleteClient(id);
return READ_ERROR;
}
}
msg->id = id;
dbgPrintf(DEFCOL, "DONE13.\n");
return 0;
}
/*
* write():
*/
int CServerSocket::write(msg_t *msg)
{
struct timeval timeout;
fd_set tset;
int len;
dbgPrintf(DEFCOL, "Write a message... ");
FD_ZERO(&tset);
/*
* Be sure the msg->id is still valid; we cannot do
* a delete between a read and a write. Should we
* use a readpending set in read method, so we know
* that we are still waiting for writing? For now,
* it's the responsibility of server code.
*/
FD_SET(client_fd[msg->id], &tset);
timeout.tv_sec = 0, timeout.tv_usec = 0;
if ((select(255, NULL, &tset, NULL, &timeout)) <= 0)
{
deleteClient(msg->id); // this shouldn't happen if the net connection is good
return TIMEOUT_ERROR;
}
if (msg->length < 0)
msg->length = (INT32)strlen(msg->buffer);
if (msg->length > PACKET_SIZE)
return WRITE_ERROR; // too big
len = msg->length+HEADER_SIZE;
//msg->id = htonl(msg->id); // same comment as for read
msg->type = htonl(msg->type);
msg->length = htonl(msg->length);
if (send(client_fd[msg->id], (const char *)msg, len, 0) != len)
{
deleteClient(msg->id);
return WRITE_ERROR;
}
dbgPrintf(DEFCOL, "DONE14.\n");
return 0;
}
/*
* writeUDP()
*/
int CServerSocket::writeUDP(const char *data, size_t length, const char *ip, UINT16 port)
{
sockaddr_in sin;
struct timeval timeout;
fd_set tset;
FD_ZERO(&tset);
FD_SET(udp_fd, &tset);
if ((select(255, NULL, &tset, NULL, &timeout)) <= 0)
{
return TIMEOUT_ERROR;
}
sin.sin_family = AF_INET;
inet_aton(ip, &sin.sin_addr);
sin.sin_port = htons(port);
sendto(udp_fd, data, (int)length, 0, (sockaddr*)&sin, sizeof(sin));
return 0;
}
/*
* accept()
*/
int CServerSocket::accept()
{
socklen_t lg = sizeof (addr);
dbgPrintf(DEFCOL, "Accepting on (socket %u)... ", accept_fd);
if ((client_fd[num_clients] = ::accept(accept_fd, (struct sockaddr *) &addr, &lg)) == (SOCKET)-1)
{
//client_fd[num_clients] = (SOCKET)-1; // we haven't accepted the client, so set it at default value
return ACCEPT_ERROR;
}
if (num_clients < MAX_CLIENT-1)
{
extern FILE *sockfile;
logPrintf(sockfile, "Accepting on socket %u for client %u (%s:%i)\n",
client_fd[num_clients], num_clients+1, inet_ntoa(addr.sin_addr), htons(addr.sin_port));
memcpy(&client_addr[num_clients], &addr, sizeof (addr));
FD_SET(client_fd[num_clients], &rset);
num_clients++;
}
else // we have reached the maximum number of clients
{
// close the connection (meaning "try again" for the client)
close(client_fd[num_clients]);
client_fd[num_clients] = (SOCKET)-1;
return ACCEPT_ERROR;
}
//dbgPrintf(DEFCOL, "DONE15.\n");
return 0;
}
/*
* getClientIP()
*/
const char *CServerSocket::getClientIP(size_t id)
{
dbgPrintf(DEFCOL, "getClientIP: %u\n", id);
return inet_ntoa(client_addr[id].sin_addr);
}
/*
* getClientPort()
*/
const char *CServerSocket::getClientPort(size_t id)
{
static char buffer[8];
dbgPrintf(DEFCOL, "getClientPort: %u\n", id);
UINT16 port = htons(client_addr[id].sin_port);
snprintf(buffer, sizeof buffer, "%d", port);
return buffer;
}
/*
* mySignal()
*/
#ifndef _WIN32
static Sigfunc *mySignal(int signo, Sigfunc *func)
{
struct sigaction act, oact;
act.sa_handler = func;
sigemptyset(&act.sa_mask);
#if defined (SA_RESTART)
act.sa_flags = SA_RESTART;
#else
act.sa_flags = 0;
#endif
if (sigaction(signo, &act, &oact) < 0)
return SIG_ERR;
return oact.sa_handler;
}
/*
* sigHandler()
*/
static void sigHandler(int signr)
{
mySignal(signr, sigHandler);
switch (signr)
{
case SIGPIPE:
dbgPrintf(DEFCOL, "Catch SIG_PIPE\n");
/// TODO be sure the socket is closed if the client
/// didn't quit properly
break;
}
}
#endif