/* 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_udp.c #include "quakedef.h" #include #include #include #include #include #include #include #ifdef __sun__ #include #endif #ifdef NeXT #include #endif extern int gethostname (char *, int); extern int close (int); static int net_acceptsocket = -1; // socket for fielding new connections static int net_controlsocket; static int net_broadcastsocket = 0; static struct qsockaddr broadcastaddr; static unsigned long myAddr; #include "net_udp.h" //============================================================================= int UDP_Init (void) { struct hostent *local; char buff[MAXHOSTNAMELEN]; struct qsockaddr addr; char *colon; if (COM_CheckParm ("-noudp")) return -1; // determine my name & address gethostname(buff, MAXHOSTNAMELEN); local = gethostbyname(buff); if (!local) myAddr = htonl(INADDR_LOOPBACK); // default to the loopback address else myAddr = *(int *)local->h_addr_list[0]; // if the quake hostname isn't set, set it to the machine name if (strcmp(hostname.string, "UNNAMED") == 0) { buff[15] = 0; Cvar_Set ("hostname", buff); } if ((net_controlsocket = UDP_OpenSocket (0)) == -1) Sys_Error("UDP_Init: Unable to open control socket\n"); ((struct sockaddr_in *)&broadcastaddr)->sin_family = AF_INET; ((struct sockaddr_in *)&broadcastaddr)->sin_addr.s_addr = htonl(INADDR_BROADCAST); ((struct sockaddr_in *)&broadcastaddr)->sin_port = htons(net_hostport); UDP_GetSocketAddr (net_controlsocket, &addr); strcpy(my_tcpip_address, UDP_AddrToString (&addr)); colon = strrchr (my_tcpip_address, ':'); if (colon) *colon = 0; Con_Printf("UDP Initialized\n"); tcpipAvailable = true; return net_controlsocket; } //============================================================================= void UDP_Shutdown (void) { UDP_Listen (false); UDP_CloseSocket (net_controlsocket); } //============================================================================= void UDP_Listen (qboolean state) { // enable listening if (state) { if (net_acceptsocket != -1) return; if ((net_acceptsocket = UDP_OpenSocket (net_hostport)) == -1) Sys_Error ("UDP_Listen: Unable to open accept socket\n"); return; } // disable listening if (net_acceptsocket == -1) return; UDP_CloseSocket (net_acceptsocket); net_acceptsocket = -1; } //============================================================================= int UDP_OpenSocket (int port) { int newsocket; struct sockaddr_in address; qboolean _true = true; if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) return -1; if (ioctl (newsocket, FIONBIO, (char *)&_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: close (newsocket); return -1; } //============================================================================= int UDP_CloseSocket (int socket) { if (socket == net_broadcastsocket) net_broadcastsocket = 0; return close (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 (const 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 = 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 UDP_Connect (int socket, struct qsockaddr *addr) { return 0; } //============================================================================= int UDP_CheckNewConnections (void) { unsigned long available; struct sockaddr_in from; socklen_t fromlen; char buff[1]; if (net_acceptsocket == -1) return -1; if (ioctl (net_acceptsocket, FIONREAD, &available) == -1) Sys_Error ("UDP: ioctlsocket (FIONREAD) failed\n"); if (available) return net_acceptsocket; recvfrom (net_acceptsocket, buff, 0, 0, (struct sockaddr *) &from, &fromlen); return -1; } //============================================================================= int UDP_Recv (qbyte *buf, int len, struct qsockaddr *addr) { return UDP_Read (net_acceptsocket, buf, len, addr); } //============================================================================= int UDP_Send (qbyte *buf, int len, struct qsockaddr *addr) { return UDP_Write (net_acceptsocket, buf, len, addr); } //============================================================================= int UDP_Read (int socket, qbyte *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 && (errno == EWOULDBLOCK || errno == ECONNREFUSED)) return 0; return ret; } //============================================================================= int UDP_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 UDP_Broadcast (int socket, qbyte *buf, int len) { int ret; if (socket != net_broadcastsocket) { if (net_broadcastsocket != 0) Sys_Error("Attempted to use multiple broadcasts sockets\n"); ret = UDP_MakeSocketBroadcastCapable (socket); if (ret == -1) { Con_Printf("Unable to make socket broadcast capable\n"); return ret; } } return UDP_Write (socket, buf, len, &broadcastaddr); } //============================================================================= int UDP_Write (int socket, qbyte *buf, int len, struct qsockaddr *addr) { int ret; ret = sendto (socket, buf, len, 0, (struct sockaddr *)addr, sizeof(struct qsockaddr)); if (ret == -1 && errno == EWOULDBLOCK) return 0; return ret; } //============================================================================= char *UDP_AddrToString (const 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 UDP_StringToAddr (const 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; } //============================================================================= unsigned long inet_addr(const char *cp); int UDP_GetSocketAddr (int socket, struct qsockaddr *addr) { int addrlen = sizeof(struct qsockaddr); unsigned int a; 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 UDP_GetNameFromAddr (const 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) { strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1); return 0; } strcpy (name, UDP_AddrToString (addr)); return 0; } //============================================================================= int UDP_GetAddrFromName(const 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 UDP_AddrCompare (const struct qsockaddr *addr1, const 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 UDP_GetSocketPort (struct qsockaddr *addr) { return ntohs(((struct sockaddr_in *)addr)->sin_port); } int UDP_SetSocketPort (struct qsockaddr *addr, int port) { ((struct sockaddr_in *)addr)->sin_port = htons(port); return 0; }