ref: 02611e064eceed8d8cda8cc4d6e60f8f1833ea72
dir: /u/net_mp.c/
/* Copyright (C) 1996-1997 Id Software, Inc. 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. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ // net_mpath.c #include <dpmi.h> #include "quakedef.h" #include "mpdosock.h" short flat_selector; int WSAGetLastError(void); void sockets_flush(void); extern cvar_t hostname; #define MAXHOSTNAMELEN 256 static int net_acceptsocket = -1; // socket for fielding new connections static int net_controlsocket; static int net_broadcastsocket = 0; //static qboolean ifbcastinit = false; static struct qsockaddr broadcastaddr; static unsigned long myAddr; #include "net_mp.h" //============================================================================= int MPATH_Init (void) { int i; struct hostent *local = NULL; char buff[MAXHOSTNAMELEN]; struct qsockaddr addr; char *p; if (COM_CheckParm ("-mpath") == 0) return -1; flat_selector = __dpmi_allocate_ldt_descriptors(1); if (flat_selector == -1) { Con_Printf("MPATH_Init: Can't get flat selector\n"); return -1; } if (__dpmi_set_segment_base_address(flat_selector, 0) == -1) { Con_Printf("MPATH_Init: Can't seg flat base!\n"); return -1; } if (__dpmi_set_segment_limit(flat_selector, 0xffffffff) == -1) { Con_Printf("MPATH_Init: Can't set segment limit\n"); return -1; } // determine my name & address if (gethostname(buff, MAXHOSTNAMELEN) == 0) local = gethostbyname(buff); if (local) { myAddr = *(int *)local->h_addr_list[0]; // if the quake hostname isn't set, set it to the machine name if (Q_strcmp(hostname.string, "UNNAMED") == 0) { // see if it's a text IP address (well, close enough) for (p = buff; *p; p++) if ((*p < '0' || *p > '9') && *p != '.') break; // if it is a real name, strip off the domain; we only want the host if (*p) { for (i = 0; i < 15; i++) if (buff[i] == '.') break; buff[i] = 0; } Cvar_Set ("hostname", buff); } } if ((net_controlsocket = MPATH_OpenSocket (0)) == -1) Sys_Error("MPATH_Init: Unable to open control socket\n"); ((struct sockaddr_in *)&broadcastaddr)->sin_family = AF_INET; ((struct sockaddr_in *)&broadcastaddr)->sin_addr.s_addr = INADDR_BROADCAST; ((struct sockaddr_in *)&broadcastaddr)->sin_port = htons(net_hostport); MPATH_GetSocketAddr (net_controlsocket, &addr); Q_strcpy(my_tcpip_address, MPATH_AddrToString (&addr)); p = Q_strrchr (my_tcpip_address, ':'); if (p) *p = 0; Con_Printf("MPath Initialized\n"); tcpipAvailable = true; return net_controlsocket; } //============================================================================= void MPATH_Shutdown (void) { MPATH_Listen (false); MPATH_CloseSocket (net_controlsocket); } //============================================================================= void MPATH_Listen (qboolean state) { // enable listening if (state) { if (net_acceptsocket != -1) return; if ((net_acceptsocket = MPATH_OpenSocket (net_hostport)) == -1) Sys_Error ("MPATH_Listen: Unable to open accept socket\n"); return; } // disable listening if (net_acceptsocket == -1) return; MPATH_CloseSocket (net_acceptsocket); net_acceptsocket = -1; } //============================================================================= int MPATH_OpenSocket (int port) { int newsocket; struct sockaddr_in address; u_long _true = 1; if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) return -1; if (ioctlsocket (newsocket, FIONBIO, &_true) == -1) goto ErrorReturn; address.sin_family = AF_INET; address.sin_addr.s_addr = INADDR_ANY; address.sin_port = htons(port); if( bind (newsocket, (void *)&address, sizeof(address)) == -1) goto ErrorReturn; return newsocket; ErrorReturn: closesocket (newsocket); return -1; } //============================================================================= int MPATH_CloseSocket (int socket) { if (socket == net_broadcastsocket) net_broadcastsocket = 0; return closesocket (socket); } //============================================================================= /* ============ PartialIPAddress this lets you type only as much of the net address as required, using the local network components to fill in the rest ============ */ static int PartialIPAddress (char *in, struct qsockaddr *hostaddr) { char buff[256]; char *b; int addr; int num; int mask; int run; int port; buff[0] = '.'; b = buff; strcpy(buff+1, in); if (buff[1] == '.') b++; addr = 0; mask=-1; while (*b == '.') { b++; num = 0; run = 0; while (!( *b < '0' || *b > '9')) { num = num*10 + *b++ - '0'; if (++run > 3) return -1; } if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0) return -1; if (num < 0 || num > 255) return -1; mask<<=8; addr = (addr<<8) + num; } if (*b++ == ':') port = Q_atoi(b); else port = net_hostport; hostaddr->sa_family = AF_INET; ((struct sockaddr_in *)hostaddr)->sin_port = htons((short)port); ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr = (myAddr & htonl(mask)) | htonl(addr); return 0; } //============================================================================= int MPATH_Connect (int socket, struct qsockaddr *addr) { return 0; } //============================================================================= int MPATH_CheckNewConnections (void) { char buf[4]; if (net_acceptsocket == -1) return -1; if (recvfrom (net_acceptsocket, buf, 4, MSG_PEEK, NULL, NULL) > 0) return net_acceptsocket; return -1; } //============================================================================= int MPATH_Read (int socket, byte *buf, int len, struct qsockaddr *addr) { int addrlen = sizeof (struct qsockaddr); int ret; ret = recvfrom (socket, buf, len, 0, (struct sockaddr *)addr, &addrlen); if (ret == -1) { int errno = WSAGetLastError(); if (errno == WSAEWOULDBLOCK || errno == WSAECONNREFUSED) return 0; } return ret; } //============================================================================= int MPATH_MakeSocketBroadcastCapable (int socket) { int i = 1; // make this socket broadcast capable if (setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0) return -1; net_broadcastsocket = socket; return 0; } //============================================================================= int MPATH_Broadcast (int socket, byte *buf, int len) { int ret; if (socket != net_broadcastsocket) { if (net_broadcastsocket != 0) Sys_Error("Attempted to use multiple broadcasts sockets\n"); ret = MPATH_MakeSocketBroadcastCapable (socket); if (ret == -1) { Con_Printf("Unable to make socket broadcast capable\n"); return ret; } } return MPATH_Write (socket, buf, len, &broadcastaddr); } //============================================================================= int MPATH_Write (int socket, byte *buf, int len, struct qsockaddr *addr) { int ret; ret = sendto (socket, buf, len, 0, (struct sockaddr *)addr, sizeof(struct qsockaddr)); if (ret == -1) if (WSAGetLastError() == WSAEWOULDBLOCK) return 0; sockets_flush(); return ret; } //============================================================================= char *MPATH_AddrToString (struct qsockaddr *addr) { static char buffer[22]; int haddr; haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr); sprintf(buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff, (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff, ntohs(((struct sockaddr_in *)addr)->sin_port)); return buffer; } //============================================================================= int MPATH_StringToAddr (char *string, struct qsockaddr *addr) { int ha1, ha2, ha3, ha4, hp; int ipaddr; sscanf(string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp); ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4; addr->sa_family = AF_INET; ((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr); ((struct sockaddr_in *)addr)->sin_port = htons(hp); return 0; } //============================================================================= int MPATH_GetSocketAddr (int socket, struct qsockaddr *addr) { int addrlen = sizeof(struct qsockaddr); unsigned int a; Q_memset(addr, 0, sizeof(struct qsockaddr)); getsockname(socket, (struct sockaddr *)addr, &addrlen); a = ((struct sockaddr_in *)addr)->sin_addr.s_addr; if (a == 0 || a == inet_addr("127.0.0.1")) ((struct sockaddr_in *)addr)->sin_addr.s_addr = myAddr; return 0; } //============================================================================= int MPATH_GetNameFromAddr (struct qsockaddr *addr, char *name) { struct hostent *hostentry; hostentry = gethostbyaddr ((char *)&((struct sockaddr_in *)addr)->sin_addr, sizeof(struct in_addr), AF_INET); if (hostentry) { Q_strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1); return 0; } Q_strcpy (name, MPATH_AddrToString (addr)); return 0; } //============================================================================= int MPATH_GetAddrFromName(char *name, struct qsockaddr *addr) { struct hostent *hostentry; if (name[0] >= '0' && name[0] <= '9') return PartialIPAddress (name, addr); hostentry = gethostbyname (name); if (!hostentry) return -1; addr->sa_family = AF_INET; ((struct sockaddr_in *)addr)->sin_port = htons(net_hostport); ((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0]; return 0; } //============================================================================= int MPATH_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2) { if (addr1->sa_family != addr2->sa_family) return -1; if (((struct sockaddr_in *)addr1)->sin_addr.s_addr != ((struct sockaddr_in *)addr2)->sin_addr.s_addr) return -1; if (((struct sockaddr_in *)addr1)->sin_port != ((struct sockaddr_in *)addr2)->sin_port) return 1; return 0; } //============================================================================= int MPATH_GetSocketPort (struct qsockaddr *addr) { return ntohs(((struct sockaddr_in *)addr)->sin_port); } int MPATH_SetSocketPort (struct qsockaddr *addr, int port) { ((struct sockaddr_in *)addr)->sin_port = htons(port); return 0; } //=============================================================================