/* net_udp.c (description) Copyright (C) 1996-1997 Id Software, Inc. Copyright (C) 2000 Marcus Sundberg [mackan@stacken.kth.se] 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: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA */ #ifdef HAVE_CONFIG_H # include "config.h" #endif static __attribute__ ((unused)) const char rcsid[] = "$Id$"; #ifdef HAVE_UNISTD_H # include #endif #ifdef HAVE_SYS_PARAM_H # include #endif #ifdef HAVE_SYS_IOCTL_H # include #endif #ifdef HAVE_SYS_SOCKET_H # include #endif #ifdef HAVE_NETINET_IN_H # define model_t sun_model_t # include # undef model_t #endif #ifdef HAVE_NETDB_H # include #endif #ifdef HAVE_ARPA_INET_H # include #endif #ifdef HAVE_SYS_FILIO_H # include #endif #ifdef NeXT # include #endif #include #include #include #include #include #include "QF/console.h" #include "QF/cvar.h" #include "QF/dstring.h" #include "QF/msg.h" #include "QF/sys.h" #include "QF/qargs.h" #include "compat.h" #include "netchan.h" #ifdef _WIN32 # include # undef EWOULDBLOCK # define EWOULDBLOCK WSAEWOULDBLOCK #endif #ifndef MAXHOSTNAMELEN # define MAXHOSTNAMELEN 512 #endif #ifndef HAVE_SOCKLEN_T # ifdef HAVE_SIZE typedef size_t socklen_t; # else typedef unsigned int socklen_t; # endif #endif int net_socket; netadr_t net_local_adr; netadr_t net_from; static sizebuf_t _net_message_message; static qmsg_t _net_message = {0, 0, &_net_message_message}; qmsg_t *net_message = &_net_message; #define MAX_UDP_PACKET (MAX_MSGLEN*2) byte net_message_buffer[MAX_UDP_PACKET]; #ifdef _WIN32 WSADATA winsockdata; #endif static void NetadrToSockadr (netadr_t *a, struct sockaddr_in *s) { memset (s, 0, sizeof (*s)); s->sin_family = AF_INET; memcpy (&s->sin_addr, &a->ip, 4); s->sin_port = a->port; } static void SockadrToNetadr (struct sockaddr_in *s, netadr_t *a) { memcpy (&a->ip, &s->sin_addr, 4); a->port = s->sin_port; } qboolean NET_CompareBaseAdr (netadr_t a, netadr_t b) { if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3]) return true; return false; } qboolean NET_CompareAdr (netadr_t a, netadr_t b) { if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3] && a.port == b.port) return true; return false; } const char * NET_AdrToString (netadr_t a) { static char s[64]; snprintf (s, sizeof (s), "%i.%i.%i.%i:%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3], ntohs (a.port)); return s; } const char * NET_BaseAdrToString (netadr_t a) { static char s[64]; snprintf (s, sizeof (s), "%i.%i.%i.%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3]); return s; } /* NET_StringToAdr idnewt idnewt:28000 192.246.40.70 192.246.40.70:28000 */ qboolean NET_StringToAdr (const char *s, netadr_t *a) { static dstring_t *copy; char *colon; struct hostent *h; struct sockaddr_in sadr; if (!copy) copy = dstring_new (); memset (&sadr, 0, sizeof (sadr)); sadr.sin_family = AF_INET; sadr.sin_port = 0; dstring_copystr (copy, s); // strip off a trailing :port if present for (colon = copy->str; *colon; colon++) if (*colon == ':') { *colon = 0; sadr.sin_port = htons ((unsigned short) atoi (colon + 1)); } if (copy->str[0] >= '0' && copy->str[0] <= '9') { int addr = inet_addr (copy->str); memcpy (&sadr.sin_addr, &addr, 4); } else { if (!(h = gethostbyname (copy->str))) return 0; memcpy (&sadr.sin_addr, h->h_addr_list[0], 4); } SockadrToNetadr (&sadr, a); return true; } // Returns true if we can't bind the address locally--in other words, // the IP is NOT one of our interfaces. qboolean NET_IsClientLegal (netadr_t *adr) { #if 0 int newsocket; struct sockaddr_in sadr; if (adr->ip[0] == 127) return false; // no local connections period NetadrToSockadr (adr, &sadr); if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) Sys_Error ("NET_IsClientLegal: socket:", strerror (errno)); sadr.sin_port = 0; if (bind (newsocket, (void *) &sadr, sizeof (sadr)) == -1) { // It is not a local address close (newsocket); return true; } close (newsocket); return false; #else return true; #endif } qboolean NET_GetPacket (void) { int ret; socklen_t fromlen; struct sockaddr_in from; fromlen = sizeof (from); ret = recvfrom (net_socket, (void *) net_message_buffer, sizeof (net_message_buffer), 0, (struct sockaddr *) &from, &fromlen); SockadrToNetadr (&from, &net_from); if (ret == -1) { #ifdef _WIN32 int err = WSAGetLastError (); if (err == WSAEMSGSIZE) { Con_Printf ("Warning: Oversize packet from %s\n", NET_AdrToString (net_from)); return false; } if (err == 10054) { Con_DPrintf ("error 10054 from %s\n", NET_AdrToString (net_from)); return false; } #else // _WIN32 int err = errno; if (err == ECONNREFUSED) return false; #endif // _WIN32 if (err == EWOULDBLOCK) return false; Con_Printf ("NET_GetPacket: %d: %s\n", err, strerror (err)); return false; } // Check for malformed packets if (ntohs(net_from.port)<1024) { Con_Printf ("Warning: Packet from %s dropped: Bad port\n", NET_AdrToString (net_from)); return false; } if (from.sin_addr.s_addr==INADDR_ANY || from.sin_addr.s_addr == INADDR_BROADCAST) { Con_Printf ("Warning: Packet dropped - bad address\n"); return false; } _net_message_message.cursize = ret; if (ret == sizeof (net_message_buffer)) { Con_Printf ("Oversize packet from %s\n", NET_AdrToString (net_from)); return false; } return ret; } void NET_SendPacket (int length, void *data, netadr_t to) { int ret; struct sockaddr_in addr; NetadrToSockadr (&to, &addr); ret = sendto (net_socket, data, length, 0, (struct sockaddr *) &addr, sizeof (addr)); if (ret == -1) { #ifdef _WIN32 int err = WSAGetLastError (); if (err == WSAEADDRNOTAVAIL) { if (is_server) Con_DPrintf ("NET_SendPacket Warning: %i\n", err); else Con_Printf ("NET_SendPacket ERROR: %i\n", err); } #else // _WIN32 int err = errno; if (err == ECONNREFUSED) return; #endif // _WIN32 if (err == EWOULDBLOCK) return; Con_Printf ("NET_SendPacket: %s\n", strerror (errno)); } } static int UDP_OpenSocket (int port) { int newsocket, i; struct sockaddr_in address; #ifdef _WIN32 #define ioctl ioctlsocket unsigned long _true = true; #else int _true = 1; #endif memset (&address, 0, sizeof(address)); if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) Sys_Error ("UDP_OpenSocket: socket:%s", strerror (errno)); if (ioctl (newsocket, FIONBIO, &_true) == -1) Sys_Error ("UDP_OpenSocket: ioctl FIONBIO:%s", strerror (errno)); address.sin_family = AF_INET; // ZOID -- check for interface binding option if ((i = COM_CheckParm ("-ip")) != 0 && i < com_argc) { address.sin_addr.s_addr = inet_addr (com_argv[i + 1]); Con_Printf ("Binding to IP Interface Address of %s\n", inet_ntoa (address.sin_addr)); } else address.sin_addr.s_addr = INADDR_ANY; if (port == PORT_ANY) address.sin_port = 0; else address.sin_port = htons ((short) port); if (bind (newsocket, (void *) &address, sizeof (address)) == -1) Sys_Error ("UDP_OpenSocket: bind: %s", strerror (errno)); return newsocket; } static void NET_GetLocalAddress (void) { char buff[MAXHOSTNAMELEN]; socklen_t namelen; struct sockaddr_in address; gethostname (buff, MAXHOSTNAMELEN); buff[MAXHOSTNAMELEN - 1] = 0; NET_StringToAdr (buff, &net_local_adr); namelen = sizeof (address); if (getsockname (net_socket, (struct sockaddr *) &address, &namelen) == -1) Sys_Error ("NET_Init: getsockname: %s", strerror (errno)); net_local_adr.port = address.sin_port; Con_Printf ("IP address %s\n", NET_AdrToString (net_local_adr)); } void NET_Init (int port) { #ifdef _WIN32 int r; WORD wVersionRequested; wVersionRequested = MAKEWORD (1, 1); r = WSAStartup (MAKEWORD (1, 1), &winsockdata); if (r) Sys_Error ("Winsock initialization failed."); #endif /* _WIN32 */ // open the single socket to be used for all communications net_socket = UDP_OpenSocket (port); // init the message buffer _net_message_message.maxsize = sizeof (net_message_buffer); _net_message_message.data = net_message_buffer; // determine my name & address NET_GetLocalAddress (); Con_Printf ("UDP (IPv4) Initialized\n"); } void NET_Shutdown (void) { #ifdef _WIN32 closesocket (net_socket); WSACleanup (); #else close (net_socket); #endif }