463 lines
12 KiB
C
463 lines
12 KiB
C
/*
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Copyright (C) 1996-2001 Id Software, Inc.
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Copyright (C) 2007-2008 Kristian Duske
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Copyright (C) 2010-2014 QuakeSpasm developers
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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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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.
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See the GNU General Public License for more details.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "q_stdinc.h"
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#include "net_sys.h"
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#include "q_defs.h"
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#include "net_defs.h"
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static sys_socket_t net_acceptsocket = INVALID_SOCKET; // socket for fielding new connections
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static sys_socket_t net_controlsocket;
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static sys_socket_t net_broadcastsocket = 0;
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static struct sockaddr_in broadcastaddr;
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static in_addr_t myAddr;
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#include "net_udp.h"
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//=============================================================================
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sys_socket_t UDP_Init(void)
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{
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int32_t err;
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char *tst;
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char buff[MAXHOSTNAMELEN];
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struct hostent *local;
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struct qsockaddr addr;
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if(COM_CheckParm("-noudp"))
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return INVALID_SOCKET;
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// determine my name & address
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myAddr = htonl(INADDR_LOOPBACK);
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if(gethostname(buff, MAXHOSTNAMELEN) != 0)
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{
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err = SOCKETERRNO;
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Con_SafePrintf("UDP_Init: gethostname failed (%s)\n",
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socketerror(err));
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}
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else
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{
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buff[MAXHOSTNAMELEN - 1] = 0;
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#if PLATFORM_IS(OSX)
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// ericw -- if our hostname ends in ".local" (a macOS thing),
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// don't bother calling gethostbyname(), because it blocks for a few seconds
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// and then fails (on my system anyway.)
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tst = strstr(buff, ".local");
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if(tst && tst[6] == '\0')
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{
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Con_SafePrintf("UDP_Init: skipping gethostbyname for %s\n", buff);
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}
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else
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#endif
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if(!(local = gethostbyname(buff)))
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{
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Con_SafePrintf("UDP_Init: gethostbyname failed (%s)\n",
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hstrerror(h_errno));
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}
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else if(local->h_addrtype != AF_INET)
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{
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Con_SafePrintf("UDP_Init: address from gethostbyname not IPv4\n");
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}
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else
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{
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myAddr = *(in_addr_t *)local->h_addr_list[0];
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}
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}
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if((net_controlsocket = UDP_OpenSocket(0)) == INVALID_SOCKET)
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{
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Con_SafePrintf("UDP_Init: Unable to open control socket, UDP disabled\n");
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return INVALID_SOCKET;
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}
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broadcastaddr.sin_family = AF_INET;
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broadcastaddr.sin_addr.s_addr = INADDR_BROADCAST;
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broadcastaddr.sin_port = htons((uint16_t)net_hostport);
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UDP_GetSocketAddr(net_controlsocket, &addr);
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strcpy(my_tcpip_address, UDP_AddrToString(&addr));
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tst = strrchr(my_tcpip_address, ':');
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if(tst) *tst = 0;
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Con_SafePrintf("UDP Initialized\n");
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tcpipAvailable = true;
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return net_controlsocket;
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}
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//=============================================================================
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void UDP_Shutdown(void)
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{
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UDP_Listen(false);
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UDP_CloseSocket(net_controlsocket);
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}
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//=============================================================================
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void UDP_Listen(bool state)
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{
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// enable listening
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if(state)
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{
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if(net_acceptsocket != INVALID_SOCKET)
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return;
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if((net_acceptsocket = UDP_OpenSocket(net_hostport)) == INVALID_SOCKET)
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Sys_Error("UDP_Listen: Unable to open accept socket");
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return;
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}
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// disable listening
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if(net_acceptsocket == INVALID_SOCKET)
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return;
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UDP_CloseSocket(net_acceptsocket);
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net_acceptsocket = INVALID_SOCKET;
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}
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//=============================================================================
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sys_socket_t UDP_OpenSocket(int32_t port)
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{
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sys_socket_t newsocket;
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struct sockaddr_in address;
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int32_t istrue = 1;
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int32_t err;
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if((newsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET)
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{
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err = SOCKETERRNO;
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Con_SafePrintf("UDP_OpenSocket: %s\n", socketerror(err));
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return INVALID_SOCKET;
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}
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if(ioctlsocket(newsocket, FIONBIO, &istrue) == SOCKET_ERROR)
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goto error;
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memset(&address, 0, sizeof(struct sockaddr_in));
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = INADDR_ANY;
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address.sin_port = htons((uint16_t)port);
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if(bind(newsocket, (struct sockaddr *)&address, sizeof(address)) == 0)
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return newsocket;
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error:
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err = SOCKETERRNO;
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Con_SafePrintf("UDP_OpenSocket: %s\n", socketerror(err));
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UDP_CloseSocket(newsocket);
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return INVALID_SOCKET;
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}
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//=============================================================================
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int32_t UDP_CloseSocket(sys_socket_t socketid)
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{
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if(socketid == net_broadcastsocket)
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net_broadcastsocket = 0;
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return closesocket(socketid);
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}
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//=============================================================================
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/*
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============
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PartialIPAddress
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this lets you type only as much of the net address as required, using
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the local network components to fill in the rest
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============
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*/
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static int32_t PartialIPAddress(const char *in, struct qsockaddr *hostaddr)
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{
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char buff[256];
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char *b;
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int32_t addr, mask, num, port, run;
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buff[0] = '.';
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b = buff;
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strcpy(buff + 1, in);
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if(buff[1] == '.')
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b++;
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addr = 0;
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mask = -1;
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while(*b == '.')
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{
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b++;
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num = 0;
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run = 0;
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while(!(*b < '0' || *b > '9'))
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{
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num = num * 10 + *b++ - '0';
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if(++run > 3)
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return -1;
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}
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if((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)
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return -1;
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if(num < 0 || num > 255)
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return -1;
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mask <<= 8;
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addr = (addr << 8) + num;
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}
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if(*b++ == ':')
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port = atoi(b);
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else
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port = net_hostport;
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hostaddr->qsa_family = AF_INET;
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((struct sockaddr_in *)hostaddr)->sin_port = htons((uint16_t)port);
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((struct sockaddr_in *)hostaddr)->sin_addr.s_addr =
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(myAddr & htonl(mask)) | htonl(addr);
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return 0;
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}
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//=============================================================================
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int32_t UDP_Connect(sys_socket_t socketid, struct qsockaddr *addr)
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{
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(void)socketid, (void)addr;
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return 0;
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}
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//=============================================================================
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sys_socket_t UDP_CheckNewConnections(void)
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{
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int32_t available;
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struct sockaddr_in from;
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socklen_t fromlen;
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char buff[1];
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if(net_acceptsocket == INVALID_SOCKET)
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return INVALID_SOCKET;
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if(ioctl(net_acceptsocket, FIONREAD, &available) == -1)
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{
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int32_t err = SOCKETERRNO;
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Sys_Error("UDP: ioctlsocket (FIONREAD) failed (%s)", socketerror(err));
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}
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if(available)
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return net_acceptsocket;
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// quietly absorb empty packets
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recvfrom(net_acceptsocket, buff, 0, 0, (struct sockaddr *) &from, &fromlen);
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return INVALID_SOCKET;
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}
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//=============================================================================
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int32_t UDP_Read(sys_socket_t socketid, byte *buf, int32_t len, struct qsockaddr *addr)
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{
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socklen_t addrlen = sizeof(struct qsockaddr);
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int32_t ret;
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ret = recvfrom(socketid, buf, len, 0, (struct sockaddr *)addr, &addrlen);
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if(ret == SOCKET_ERROR)
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{
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int32_t err = SOCKETERRNO;
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if(err == NET_EWOULDBLOCK || err == NET_ECONNREFUSED)
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return 0;
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Con_SafePrintf("UDP_Read, recvfrom: %s\n", socketerror(err));
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}
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return ret;
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}
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//=============================================================================
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static int32_t UDP_MakeSocketBroadcastCapable(sys_socket_t socketid)
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{
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int32_t i = 1;
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// make this socket broadcast capable
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if(setsockopt(socketid, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i))
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== SOCKET_ERROR)
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{
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int32_t err = SOCKETERRNO;
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Con_SafePrintf("UDP, setsockopt: %s\n", socketerror(err));
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return -1;
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}
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net_broadcastsocket = socketid;
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return 0;
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}
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//=============================================================================
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int32_t UDP_Broadcast(sys_socket_t socketid, byte *buf, int32_t len)
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{
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int32_t ret;
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if(socketid != net_broadcastsocket)
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{
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if(net_broadcastsocket != 0)
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Sys_Error("Attempted to use multiple broadcasts sockets");
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ret = UDP_MakeSocketBroadcastCapable(socketid);
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if(ret == -1)
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{
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Con_Printf("Unable to make socket broadcast capable\n");
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return ret;
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}
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}
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return UDP_Write(socketid, buf, len, (struct qsockaddr *)&broadcastaddr);
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}
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//=============================================================================
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int32_t UDP_Write(sys_socket_t socketid, byte *buf, int32_t len, struct qsockaddr *addr)
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{
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int32_t ret;
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ret = sendto(socketid, buf, len, 0, (struct sockaddr *)addr,
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sizeof(struct qsockaddr));
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if(ret == SOCKET_ERROR)
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{
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int32_t err = SOCKETERRNO;
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if(err == NET_EWOULDBLOCK)
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return 0;
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Con_SafePrintf("UDP_Write, sendto: %s\n", socketerror(err));
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}
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return ret;
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}
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//=============================================================================
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const char *UDP_AddrToString(struct qsockaddr *addr)
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{
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static char buffer[22];
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int32_t haddr;
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haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);
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q_snprintf(buffer, sizeof(buffer), "%" PRIi32 ".%" PRIi32 ".%" PRIi32 ".%" PRIi32 ":%" PRIi32 "", (haddr >> 24) & 0xff,
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(haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff,
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ntohs(((struct sockaddr_in *)addr)->sin_port));
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return buffer;
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}
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//=============================================================================
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int32_t UDP_StringToAddr(const char *string, struct qsockaddr *addr)
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{
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int32_t ha1, ha2, ha3, ha4, hp, ipaddr;
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sscanf(string, "%" PRIi32 ".%" PRIi32 ".%" PRIi32 ".%" PRIi32 ":%" PRIi32 "", &ha1, &ha2, &ha3, &ha4, &hp);
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ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;
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addr->qsa_family = AF_INET;
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((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr);
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((struct sockaddr_in *)addr)->sin_port = htons((uint16_t)hp);
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return 0;
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}
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//=============================================================================
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int32_t UDP_GetSocketAddr(sys_socket_t socketid, struct qsockaddr *addr)
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{
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socklen_t addrlen = sizeof(struct qsockaddr);
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in_addr_t a;
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memset(addr, 0, sizeof(struct qsockaddr));
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if(getsockname(socketid, (struct sockaddr *)addr, &addrlen) != 0)
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return -1;
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a = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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if(a == 0 || a == htonl(INADDR_LOOPBACK))
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((struct sockaddr_in *)addr)->sin_addr.s_addr = myAddr;
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return 0;
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}
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//=============================================================================
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int32_t UDP_GetNameFromAddr(struct qsockaddr *addr, char *name)
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{
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struct hostent *hostentry;
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hostentry = gethostbyaddr((char *) & ((struct sockaddr_in *)addr)->sin_addr,
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sizeof(struct in_addr), AF_INET);
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if(hostentry)
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{
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strncpy(name, (char *)hostentry->h_name, NET_NAMELEN - 1);
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return 0;
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}
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strcpy(name, UDP_AddrToString(addr));
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return 0;
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}
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//=============================================================================
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int32_t UDP_GetAddrFromName(const char *name, struct qsockaddr *addr)
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{
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struct hostent *hostentry;
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if(name[0] >= '0' && name[0] <= '9')
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return PartialIPAddress(name, addr);
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hostentry = gethostbyname(name);
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if(!hostentry)
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return -1;
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addr->qsa_family = AF_INET;
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((struct sockaddr_in *)addr)->sin_port = htons((uint16_t)net_hostport);
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((struct sockaddr_in *)addr)->sin_addr.s_addr =
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*(in_addr_t *)hostentry->h_addr_list[0];
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return 0;
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}
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//=============================================================================
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int32_t UDP_AddrCompare(struct qsockaddr *addr1, struct qsockaddr *addr2)
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{
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if(addr1->qsa_family != addr2->qsa_family)
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return -1;
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if(((struct sockaddr_in *)addr1)->sin_addr.s_addr !=
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((struct sockaddr_in *)addr2)->sin_addr.s_addr)
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return -1;
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if(((struct sockaddr_in *)addr1)->sin_port !=
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((struct sockaddr_in *)addr2)->sin_port)
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return 1;
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return 0;
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}
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//=============================================================================
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int32_t UDP_GetSocketPort(struct qsockaddr *addr)
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{
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return ntohs(((struct sockaddr_in *)addr)->sin_port);
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}
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int32_t UDP_SetSocketPort(struct qsockaddr *addr, int32_t port)
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{
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((struct sockaddr_in *)addr)->sin_port = htons((uint16_t)port);
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return 0;
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}
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//=============================================================================
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