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Diffstat (limited to 'src/qcommon/net_ip.cpp')
| -rw-r--r-- | src/qcommon/net_ip.cpp | 1842 |
1 files changed, 1842 insertions, 0 deletions
diff --git a/src/qcommon/net_ip.cpp b/src/qcommon/net_ip.cpp new file mode 100644 index 0000000..910301d --- /dev/null +++ b/src/qcommon/net_ip.cpp @@ -0,0 +1,1842 @@ +/* +=========================================================================== +Copyright (C) 1999-2005 Id Software, Inc. +Copyright (C) 2000-2013 Darklegion Development +Copyright (C) 2015-2019 GrangerHub + +This file is part of Tremulous. + +Tremulous 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 3 of the License, +or (at your option) any later version. + +Tremulous 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 Tremulous; if not, see <https://www.gnu.org/licenses/> + +=========================================================================== +*/ + +#include "net.h" + +#include "cmd.h" +#include "cvar.h" +#include "msg.h" +#include "q_shared.h" +#include "qcommon.h" + +#ifdef _WIN32 +#include <winsock2.h> +#include <ws2tcpip.h> +#if WINVER < 0x501 +#ifdef __MINGW32__ +// wspiapi.h isn't available on MinGW, so if it's +// present it's because the end user has added it +// and we should look for it in our tree +#include "wspiapi.h" +#else +#include <wspiapi.h> +#endif +#else +#include <ws2spi.h> +#endif + +typedef int socklen_t; +#ifdef ADDRESS_FAMILY +#define sa_family_t ADDRESS_FAMILY +#else +typedef unsigned short sa_family_t; +#endif + +#define EAGAIN WSAEWOULDBLOCK +#define EADDRNOTAVAIL WSAEADDRNOTAVAIL +#define EAFNOSUPPORT WSAEAFNOSUPPORT +#define ECONNRESET WSAECONNRESET +typedef u_long ioctlarg_t; +#define socketError WSAGetLastError() + +static WSADATA winsockdata; +static bool winsockInitialized = false; + +#else + +#if MAC_OS_X_VERSION_MIN_REQUIRED == 1020 +// needed for socklen_t on OSX 10.2 +#define _BSD_SOCKLEN_T_ +#endif + +#include <sys/socket.h> +#include <errno.h> +#include <netdb.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/time.h> +#include <unistd.h> +#if !defined(__sun) && !defined(__sgi) +#include <ifaddrs.h> +#endif + +#ifdef __sun +#include <sys/filio.h> +#endif + +typedef int SOCKET; +#define INVALID_SOCKET -1 +#define SOCKET_ERROR -1 +#define closesocket close +#define ioctlsocket ioctl +typedef int ioctlarg_t; +#define socketError errno + +#endif + +static bool usingSocks = false; +static int networkingEnabled = 0; + +static cvar_t *net_enabled; +static cvar_t *net_alternateProtocols; + +static cvar_t *net_socksEnabled; +static cvar_t *net_socksServer; +static cvar_t *net_socksPort; +static cvar_t *net_socksUsername; +static cvar_t *net_socksPassword; + +static cvar_t *net_ip; +static cvar_t *net_ip6; +static cvar_t *net_ports[3]; +static cvar_t *net_port6s[3]; +static cvar_t *net_mcast6addr; +static cvar_t *net_mcast6iface; + +static cvar_t *net_dropsim; + +static struct sockaddr socksRelayAddr; + +static SOCKET ip_sockets[3] = {INVALID_SOCKET, INVALID_SOCKET, INVALID_SOCKET}; +static SOCKET ip6_sockets[3] = {INVALID_SOCKET, INVALID_SOCKET, INVALID_SOCKET}; +/* +TODO: accommodate +static SOCKET socks_socket = INVALID_SOCKET; +static SOCKET multicast6_socket = INVALID_SOCKET; +*/ + +// Keep track of currently joined multicast group. +static struct ipv6_mreq curgroup; +// And the currently bound address. +static struct sockaddr_in6 boundto; + +#ifndef IF_NAMESIZE +#define IF_NAMESIZE 16 +#endif + +// use an admin local address per default so that network admins can decide on how to handle quake3 traffic. +#define NET_MULTICAST_IP6 "ff04::696f:7175:616b:6533" + +#define MAX_IPS 32 + +typedef struct { + char ifname[IF_NAMESIZE]; + + netadrtype_t type; + sa_family_t family; + struct sockaddr_storage addr; + struct sockaddr_storage netmask; +} nip_localaddr_t; + +static nip_localaddr_t localIP[MAX_IPS]; +static int numIP; + +//============================================================================= + +/* +==================== +NET_ErrorString +==================== +*/ +const char *NET_ErrorString(void) +{ +#ifdef _WIN32 + // FIXME: replace with FormatMessage? + switch (socketError) + { + case WSAEINTR: + return "WSAEINTR"; + case WSAEBADF: + return "WSAEBADF"; + case WSAEACCES: + return "WSAEACCES"; + case WSAEDISCON: + return "WSAEDISCON"; + case WSAEFAULT: + return "WSAEFAULT"; + case WSAEINVAL: + return "WSAEINVAL"; + case WSAEMFILE: + return "WSAEMFILE"; + case WSAEWOULDBLOCK: + return "WSAEWOULDBLOCK"; + case WSAEINPROGRESS: + return "WSAEINPROGRESS"; + case WSAEALREADY: + return "WSAEALREADY"; + case WSAENOTSOCK: + return "WSAENOTSOCK"; + case WSAEDESTADDRREQ: + return "WSAEDESTADDRREQ"; + case WSAEMSGSIZE: + return "WSAEMSGSIZE"; + case WSAEPROTOTYPE: + return "WSAEPROTOTYPE"; + case WSAENOPROTOOPT: + return "WSAENOPROTOOPT"; + case WSAEPROTONOSUPPORT: + return "WSAEPROTONOSUPPORT"; + case WSAESOCKTNOSUPPORT: + return "WSAESOCKTNOSUPPORT"; + case WSAEOPNOTSUPP: + return "WSAEOPNOTSUPP"; + case WSAEPFNOSUPPORT: + return "WSAEPFNOSUPPORT"; + case WSAEAFNOSUPPORT: + return "WSAEAFNOSUPPORT"; + case WSAEADDRINUSE: + return "WSAEADDRINUSE"; + case WSAEADDRNOTAVAIL: + return "WSAEADDRNOTAVAIL"; + case WSAENETDOWN: + return "WSAENETDOWN"; + case WSAENETUNREACH: + return "WSAENETUNREACH"; + case WSAENETRESET: + return "WSAENETRESET"; + case WSAECONNABORTED: + return "WSWSAECONNABORTEDAEINTR"; + case WSAECONNRESET: + return "WSAECONNRESET"; + case WSAENOBUFS: + return "WSAENOBUFS"; + case WSAEISCONN: + return "WSAEISCONN"; + case WSAENOTCONN: + return "WSAENOTCONN"; + case WSAESHUTDOWN: + return "WSAESHUTDOWN"; + case WSAETOOMANYREFS: + return "WSAETOOMANYREFS"; + case WSAETIMEDOUT: + return "WSAETIMEDOUT"; + case WSAECONNREFUSED: + return "WSAECONNREFUSED"; + case WSAELOOP: + return "WSAELOOP"; + case WSAENAMETOOLONG: + return "WSAENAMETOOLONG"; + case WSAEHOSTDOWN: + return "WSAEHOSTDOWN"; + case WSASYSNOTREADY: + return "WSASYSNOTREADY"; + case WSAVERNOTSUPPORTED: + return "WSAVERNOTSUPPORTED"; + case WSANOTINITIALISED: + return "WSANOTINITIALISED"; + case WSAHOST_NOT_FOUND: + return "WSAHOST_NOT_FOUND"; + case WSATRY_AGAIN: + return "WSATRY_AGAIN"; + case WSANO_RECOVERY: + return "WSANO_RECOVERY"; + case WSANO_DATA: + return "WSANO_DATA"; + default: + return "NO ERROR"; + } +#else + return strerror(socketError); +#endif +} + +static void NetadrToSockadr(netadr_t *a, struct sockaddr *s) +{ + if (a->type == NA_BROADCAST) + { + ((struct sockaddr_in *)s)->sin_family = AF_INET; + ((struct sockaddr_in *)s)->sin_port = a->port; +#ifdef __FreeBSD__ + ((struct sockaddr_in *)s)->sin_addr.s_addr = INADDR_ANY; +#else + ((struct sockaddr_in *)s)->sin_addr.s_addr = INADDR_BROADCAST; +#endif + } + else if (a->type == NA_IP) + { + ((struct sockaddr_in *)s)->sin_family = AF_INET; + ((struct sockaddr_in *)s)->sin_addr.s_addr = *(int *)&a->ip; + ((struct sockaddr_in *)s)->sin_port = a->port; + } + else if (a->type == NA_IP6) + { + ((struct sockaddr_in6 *)s)->sin6_family = AF_INET6; + ((struct sockaddr_in6 *)s)->sin6_addr = *((struct in6_addr *)&a->ip6); + ((struct sockaddr_in6 *)s)->sin6_port = a->port; + ((struct sockaddr_in6 *)s)->sin6_scope_id = a->scope_id; + } + else if (a->type == NA_MULTICAST6) + { + ((struct sockaddr_in6 *)s)->sin6_family = AF_INET6; + ((struct sockaddr_in6 *)s)->sin6_addr = curgroup.ipv6mr_multiaddr; + ((struct sockaddr_in6 *)s)->sin6_port = a->port; + } +} + +static void SockadrToNetadr(struct sockaddr *s, netadr_t *a) +{ + if (s->sa_family == AF_INET) + { + a->type = NA_IP; + *(int *)&a->ip = ((struct sockaddr_in *)s)->sin_addr.s_addr; + a->port = ((struct sockaddr_in *)s)->sin_port; + } + else if (s->sa_family == AF_INET6) + { + a->type = NA_IP6; + memcpy(a->ip6, &((struct sockaddr_in6 *)s)->sin6_addr, sizeof(a->ip6)); + a->port = ((struct sockaddr_in6 *)s)->sin6_port; + a->scope_id = ((struct sockaddr_in6 *)s)->sin6_scope_id; + } + a->alternateProtocol = 0; +} + +static struct addrinfo *SearchAddrInfo(struct addrinfo *hints, sa_family_t family) +{ + while (hints) + { + if (hints->ai_family == family) return hints; + + hints = hints->ai_next; + } + + return NULL; +} + +/* +============= +Sys_StringToSockaddr +============= +*/ +static bool Sys_StringToSockaddr(const char *s, struct sockaddr *sadr, size_t sadr_len, sa_family_t family) +{ + struct addrinfo hints; + struct addrinfo *res = NULL; + struct addrinfo *search = NULL; + struct addrinfo *hintsp; + int retval; + + memset(sadr, '\0', sizeof(*sadr)); + memset(&hints, '\0', sizeof(hints)); + + hintsp = &hints; + hintsp->ai_family = family; + hintsp->ai_socktype = SOCK_DGRAM; + + retval = getaddrinfo(s, NULL, hintsp, &res); + + if (!retval) + { + if (family == AF_UNSPEC) + { + // Decide here and now which protocol family to use + if (net_enabled->integer & NET_PRIOV6) + { + if (net_enabled->integer & NET_ENABLEV6) search = SearchAddrInfo(res, AF_INET6); + + if (!search && (net_enabled->integer & NET_ENABLEV4)) search = SearchAddrInfo(res, AF_INET); + } + else + { + if (net_enabled->integer & NET_ENABLEV4) search = SearchAddrInfo(res, AF_INET); + + if (!search && (net_enabled->integer & NET_ENABLEV6)) search = SearchAddrInfo(res, AF_INET6); + } + } + else + search = SearchAddrInfo(res, family); + + if (search) + { + if (search->ai_addrlen > sadr_len) search->ai_addrlen = sadr_len; + + memcpy(sadr, search->ai_addr, search->ai_addrlen); + freeaddrinfo(res); + + return true; + } + else + Com_Printf("Sys_StringToSockaddr: Error resolving %s: No address of required type found.\n", s); + } + else + Com_Printf("Sys_StringToSockaddr: Error resolving %s: %s\n", s, gai_strerror(retval)); + + if (res) freeaddrinfo(res); + + return false; +} + +/* +============= +Sys_SockaddrToString +============= +*/ +static void Sys_SockaddrToString(char *dest, int destlen, struct sockaddr *input) +{ + socklen_t inputlen; + + if (input->sa_family == AF_INET6) + inputlen = sizeof(struct sockaddr_in6); + else + inputlen = sizeof(struct sockaddr_in); + + if (getnameinfo(input, inputlen, dest, destlen, NULL, 0, NI_NUMERICHOST) && destlen > 0) *dest = '\0'; +} + +/* +============= +Sys_StringToAdr +============= +*/ +bool Sys_StringToAdr(const char *s, netadr_t *a, netadrtype_t family) +{ + struct sockaddr_storage sadr; + sa_family_t fam; + + switch (family) + { + case NA_IP: + fam = AF_INET; + break; + case NA_IP6: + fam = AF_INET6; + break; + default: + fam = AF_UNSPEC; + break; + } + if (!Sys_StringToSockaddr(s, (struct sockaddr *)&sadr, sizeof(sadr), fam)) + { + return false; + } + + SockadrToNetadr((struct sockaddr *)&sadr, a); + return true; +} + +/* +=================== +NET_CompareBaseAdrMask + +Compare without port, and up to the bit number given in netmask. +=================== +*/ +bool NET_CompareBaseAdrMask(netadr_t a, netadr_t b, int netmask) +{ + uint8_t cmpmask, *addra, *addrb; + int curbyte; + + if (a.alternateProtocol != b.alternateProtocol) return false; + + if (a.type != b.type) return false; + + if (a.type == NA_LOOPBACK) return true; + + if (a.type == NA_IP) + { + addra = (uint8_t *)&a.ip; + addrb = (uint8_t *)&b.ip; + + if (netmask < 0 || netmask > 32) netmask = 32; + } + else if (a.type == NA_IP6) + { + addra = (uint8_t *)&a.ip6; + addrb = (uint8_t *)&b.ip6; + + if (netmask < 0 || netmask > 128) netmask = 128; + } + else + { + Com_Printf("NET_CompareBaseAdr: bad address type\n"); + return false; + } + + curbyte = netmask >> 3; + + if (curbyte && memcmp(addra, addrb, curbyte)) return false; + + netmask &= 0x07; + if (netmask) + { + cmpmask = (1 << netmask) - 1; + cmpmask <<= 8 - netmask; + + if ((addra[curbyte] & cmpmask) == (addrb[curbyte] & cmpmask)) return true; + } + else + return true; + + return false; +} + +/* +=================== +NET_CompareBaseAdr + +Compares without the port +=================== +*/ +bool NET_CompareBaseAdr(netadr_t a, netadr_t b) { return NET_CompareBaseAdrMask(a, b, -1); } +const char *NET_AdrToString(netadr_t a) +{ + static char s[NET_ADDRSTRMAXLEN]; + + if (a.type == NA_LOOPBACK) + Com_sprintf(s, sizeof(s), "loopback"); + else if (a.type == NA_IP || a.type == NA_IP6) + { + struct sockaddr_storage sadr; + + memset(&sadr, 0, sizeof(sadr)); + NetadrToSockadr(&a, (struct sockaddr *)&sadr); + Sys_SockaddrToString(s, sizeof(s), (struct sockaddr *)&sadr); + } + + return s; +} + +const char *NET_AdrToStringwPort(netadr_t a) +{ + static char s[NET_ADDRSTRMAXLEN]; + + if (a.type == NA_LOOPBACK) + Com_sprintf(s, sizeof(s), "loopback"); + else if (a.type == NA_IP) + Com_sprintf(s, sizeof(s), "%s:%hu", NET_AdrToString(a), ntohs(a.port)); + else if (a.type == NA_IP6) + Com_sprintf(s, sizeof(s), "[%s]:%hu", NET_AdrToString(a), ntohs(a.port)); + + return s; +} + +bool NET_CompareAdr(netadr_t a, netadr_t b) +{ + if (!NET_CompareBaseAdr(a, b)) return false; + + if (a.type == NA_IP || a.type == NA_IP6) + { + if (a.port == b.port) return true; + } + else + return true; + + return false; +} + +bool NET_IsLocalAddress(netadr_t adr) { return (bool)(adr.type == NA_LOOPBACK); } +//============================================================================= + +/* +================== +NET_GetPacket + +Receive one packet +================== +*/ +bool NET_GetPacket(netadr_t *net_from, msg_t *net_message, fd_set *fdr) +{ + int a; + int ret; + struct sockaddr_storage from; + socklen_t fromlen; + int err; + + for (a = 0; a < 3; ++a) + { + // indent + if (ip_sockets[a] != INVALID_SOCKET && FD_ISSET(ip_sockets[a], fdr)) + { + fromlen = sizeof(from); + ret = recvfrom( + ip_sockets[a], (char *)net_message->data, net_message->maxsize, 0, (struct sockaddr *)&from, &fromlen); + + if (ret == SOCKET_ERROR) + { + err = socketError; + + if (err != EAGAIN && err != ECONNRESET) Com_Printf("NET_GetPacket: %s\n", NET_ErrorString()); + } + else + { + memset(((struct sockaddr_in *)&from)->sin_zero, 0, 8); + + if (usingSocks && memcmp(&from, &socksRelayAddr, fromlen) == 0) + { + if (ret < 10 || net_message->data[0] != 0 || net_message->data[1] != 0 || + net_message->data[2] != 0 || net_message->data[3] != 1) + { + return false; + } + net_from->type = NA_IP; + net_from->ip[0] = net_message->data[4]; + net_from->ip[1] = net_message->data[5]; + net_from->ip[2] = net_message->data[6]; + net_from->ip[3] = net_message->data[7]; + net_from->port = *(short *)&net_message->data[8]; + net_message->readcount = 10; + } + else + { + SockadrToNetadr((struct sockaddr *)&from, net_from); + net_message->readcount = 0; + } + + net_from->alternateProtocol = a; + + if (ret >= net_message->maxsize) + { + Com_Printf("Oversize packet from %s\n", NET_AdrToString(*net_from)); + return false; + } + + net_message->cursize = ret; + return true; + } + } + + if (ip6_sockets[a] != INVALID_SOCKET && FD_ISSET(ip6_sockets[a], fdr)) + { + fromlen = sizeof(from); + ret = recvfrom( + ip6_sockets[a], (char *)net_message->data, net_message->maxsize, 0, (struct sockaddr *)&from, &fromlen); + + if (ret == SOCKET_ERROR) + { + err = socketError; + + if (err != EAGAIN && err != ECONNRESET) Com_Printf("NET_GetPacket: %s\n", NET_ErrorString()); + } + else + { + SockadrToNetadr((struct sockaddr *)&from, net_from); + net_message->readcount = 0; + + net_from->alternateProtocol = a; + + if (ret >= net_message->maxsize) + { + Com_Printf("Oversize packet from %s\n", NET_AdrToString(*net_from)); + return false; + } + + net_message->cursize = ret; + return true; + } + } + + /* + TODO: accommodate + if(multicast6_socket != INVALID_SOCKET && multicast6_socket != ip6_socket && FD_ISSET(multicast6_socket, fdr)) + { + fromlen = sizeof(from); + ret = recvfrom(multicast6_socket, (char*)net_message->data, net_message->maxsize, 0, (struct sockaddr *) + &from, &fromlen); + + if (ret == SOCKET_ERROR) + { + err = socketError; + + if( err != EAGAIN && err != ECONNRESET ) + Com_Printf( "NET_GetPacket: %s\n", NET_ErrorString() ); + } + else + { + SockadrToNetadr((struct sockaddr *) &from, net_from); + net_message->readcount = 0; + + if(ret >= net_message->maxsize) + { + Com_Printf( "Oversize packet from %s\n", NET_AdrToString (*net_from) ); + return false; + } + + net_message->cursize = ret; + return true; + } + } + */ + // outdent + } + + return false; +} + +//============================================================================= + +static char socksBuf[4096]; + +/* +================== +Sys_SendPacket +================== +*/ +void Sys_SendPacket(int length, const void *data, netadr_t to) +{ + int ret = SOCKET_ERROR; + struct sockaddr_storage addr; + + if (to.type != NA_BROADCAST && to.type != NA_IP && to.type != NA_IP6 && to.type != NA_MULTICAST6) + { + Com_Error(ERR_FATAL, "Sys_SendPacket: bad address type"); + return; + } + + if ((ip_sockets[to.alternateProtocol] == INVALID_SOCKET && to.type == NA_IP) || + (ip_sockets[to.alternateProtocol] == INVALID_SOCKET && to.type == NA_BROADCAST) || + (ip6_sockets[to.alternateProtocol] == INVALID_SOCKET && to.type == NA_IP6) || + (/* TODO: accommodate ip6_socket == INVALID_SOCKET && */ to.type == NA_MULTICAST6)) + return; + + if (to.type == NA_MULTICAST6 && (net_enabled->integer & NET_DISABLEMCAST)) return; + + memset(&addr, 0, sizeof(addr)); + NetadrToSockadr(&to, (struct sockaddr *)&addr); + + if (usingSocks && to.type == NA_IP) + { + socksBuf[0] = 0; // reserved + socksBuf[1] = 0; + socksBuf[2] = 0; // fragment (not fragmented) + socksBuf[3] = 1; // address type: IPV4 + *(int *)&socksBuf[4] = ((struct sockaddr_in *)&addr)->sin_addr.s_addr; + *(short *)&socksBuf[8] = ((struct sockaddr_in *)&addr)->sin_port; + memcpy(&socksBuf[10], data, length); + ret = sendto(ip_sockets[to.alternateProtocol], (const char *)socksBuf, length + 10, 0, &socksRelayAddr, + sizeof(socksRelayAddr)); + } + else + { + if (addr.ss_family == AF_INET) + ret = sendto(ip_sockets[to.alternateProtocol], (const char *)data, length, 0, (struct sockaddr *)&addr, + sizeof(struct sockaddr_in)); + else if (addr.ss_family == AF_INET6) + ret = sendto(ip6_sockets[to.alternateProtocol], (const char *)data, length, 0, (struct sockaddr *)&addr, + sizeof(struct sockaddr_in6)); + } + if (ret == SOCKET_ERROR) + { + int err = socketError; + + // wouldblock is silent + if (err == EAGAIN) + { + return; + } + + // some PPP links do not allow broadcasts and return an error + if ((err == EADDRNOTAVAIL) && ((to.type == NA_BROADCAST))) + { + return; + } + + Com_Printf("Sys_SendPacket: %s\n", NET_ErrorString()); + } +} + +//============================================================================= + +/* +================== +Sys_IsLANAddress + +LAN clients will have their rate var ignored +================== +*/ +bool Sys_IsLANAddress(netadr_t adr) +{ + int index, run, addrsize; + bool differed; + uint8_t *compareadr, *comparemask, *compareip; + + if (adr.type == NA_LOOPBACK) + { + return true; + } + + if (adr.type == NA_IP) + { + // RFC1918: + // 10.0.0.0 - 10.255.255.255 (10/8 prefix) + // 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) + // 192.168.0.0 - 192.168.255.255 (192.168/16 prefix) + if (adr.ip[0] == 10) return true; + if (adr.ip[0] == 172 && (adr.ip[1] & 0xf0) == 16) return true; + if (adr.ip[0] == 192 && adr.ip[1] == 168) return true; + + if (adr.ip[0] == 127) return true; + } + else if (adr.type == NA_IP6) + { + if (adr.ip6[0] == 0xfe && (adr.ip6[1] & 0xc0) == 0x80) return true; + if ((adr.ip6[0] & 0xfe) == 0xfc) return true; + } + + // Now compare against the networks this computer is member of. + for (index = 0; index < numIP; index++) + { + if (localIP[index].type == adr.type) + { + if (adr.type == NA_IP) + { + compareip = (uint8_t *)&((struct sockaddr_in *)&localIP[index].addr)->sin_addr.s_addr; + comparemask = (uint8_t *)&((struct sockaddr_in *)&localIP[index].netmask)->sin_addr.s_addr; + compareadr = adr.ip; + + addrsize = sizeof(adr.ip); + } + else + { + // TODO? should we check the scope_id here? + + compareip = (uint8_t *)&((struct sockaddr_in6 *)&localIP[index].addr)->sin6_addr; + comparemask = (uint8_t *)&((struct sockaddr_in6 *)&localIP[index].netmask)->sin6_addr; + compareadr = adr.ip6; + + addrsize = sizeof(adr.ip6); + } + + differed = false; + for (run = 0; run < addrsize; run++) + { + if ((compareip[run] & comparemask[run]) != (compareadr[run] & comparemask[run])) + { + differed = true; + break; + } + } + + if (!differed) return true; + } + } + + return false; +} + +/* +================== +Sys_ShowIP +================== +*/ +void Sys_ShowIP(void) +{ + int i; + char addrbuf[NET_ADDRSTRMAXLEN]; + + for (i = 0; i < numIP; i++) + { + Sys_SockaddrToString(addrbuf, sizeof(addrbuf), (struct sockaddr *)&localIP[i].addr); + + if (localIP[i].type == NA_IP) + Com_Printf("IP: %s\n", addrbuf); + else if (localIP[i].type == NA_IP6) + Com_Printf("IP6: %s\n", addrbuf); + } +} + +//============================================================================= + +/* +==================== +NET_IPSocket +==================== +*/ +SOCKET NET_IPSocket(int alternateProtocol, char *net_interface, int port, int *err) +{ + SOCKET newsocket; + struct sockaddr_in address; + ioctlarg_t _true = 1; + int i = 1; + + *err = 0; + + if (net_interface) + { + Com_Printf("Opening%s IP socket: %s:%i\n", + (alternateProtocol == 2 ? " alternate-2" : alternateProtocol == 1 ? " alternate-1" : ""), net_interface, + port); + } + else + { + Com_Printf("Opening%s IP socket: 0.0.0.0:%i\n", + (alternateProtocol == 2 ? " alternate-2" : alternateProtocol == 1 ? " alternate-1" : ""), port); + } + + if ((newsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) + { + *err = socketError; + Com_Printf("WARNING: NET_IPSocket: socket: %s\n", NET_ErrorString()); + return newsocket; + } + // make it non-blocking + if (ioctlsocket(newsocket, FIONBIO, &_true) == SOCKET_ERROR) + { + Com_Printf("WARNING: NET_IPSocket: ioctl FIONBIO: %s\n", NET_ErrorString()); + *err = socketError; + closesocket(newsocket); + return INVALID_SOCKET; + } + + // make it broadcast capable + if (setsockopt(newsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) == SOCKET_ERROR) + { + Com_Printf("WARNING: NET_IPSocket: setsockopt SO_BROADCAST: %s\n", NET_ErrorString()); + } + + if (!net_interface || !net_interface[0]) + { + address.sin_family = AF_INET; + address.sin_addr.s_addr = INADDR_ANY; + } + else + { + if (!Sys_StringToSockaddr(net_interface, (struct sockaddr *)&address, sizeof(address), AF_INET)) + { + closesocket(newsocket); + return INVALID_SOCKET; + } + } + + if (port == PORT_ANY) + { + address.sin_port = 0; + } + else + { + address.sin_port = htons((short)port); + } + + if (bind(newsocket, (const sockaddr *)&address, sizeof(address)) == SOCKET_ERROR) + { + Com_Printf("WARNING: NET_IPSocket: bind: %s\n", NET_ErrorString()); + *err = socketError; + closesocket(newsocket); + return INVALID_SOCKET; + } + + return newsocket; +} + +/* +==================== +NET_IP6Socket +==================== +*/ +SOCKET NET_IP6Socket(int alternateProtocol, char *net_interface, int port, struct sockaddr_in6 *bindto, int *err) +{ + SOCKET newsocket; + struct sockaddr_in6 address; + ioctlarg_t _true = 1; + + *err = 0; + + if (net_interface) + { + // Print the name in brackets if there is a colon: + if (Q_CountChar(net_interface, ':')) + Com_Printf("Opening%s IP6 socket: [%s]:%i\n", + (alternateProtocol == 2 ? " alternate-2" : alternateProtocol == 1 ? " alternate-1" : ""), net_interface, + port); + else + Com_Printf("Opening%s IP6 socket: %s:%i\n", + (alternateProtocol == 2 ? " alternate-2" : alternateProtocol == 1 ? " alternate-1" : ""), net_interface, + port); + } + else + Com_Printf("Opening%s IP6 socket: [::]:%i\n", + (alternateProtocol == 2 ? " alternate-2" : alternateProtocol == 1 ? " alternate-1" : ""), port); + + if ((newsocket = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET) + { + *err = socketError; + Com_Printf("WARNING: NET_IP6Socket: socket: %s\n", NET_ErrorString()); + return newsocket; + } + + // make it non-blocking + if (ioctlsocket(newsocket, FIONBIO, &_true) == SOCKET_ERROR) + { + Com_Printf("WARNING: NET_IP6Socket: ioctl FIONBIO: %s\n", NET_ErrorString()); + *err = socketError; + closesocket(newsocket); + return INVALID_SOCKET; + } + +#ifdef IPV6_V6ONLY + { + int i = 1; + + // ipv4 addresses should not be allowed to connect via this socket. + if (setsockopt(newsocket, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&i, sizeof(i)) == SOCKET_ERROR) + { + // win32 systems don't seem to support this anyways. + Com_DPrintf("WARNING: NET_IP6Socket: setsockopt IPV6_V6ONLY: %s\n", NET_ErrorString()); + } + } +#endif + + if (!net_interface || !net_interface[0]) + { + address.sin6_family = AF_INET6; + address.sin6_addr = in6addr_any; + } + else + { + if (!Sys_StringToSockaddr(net_interface, (struct sockaddr *)&address, sizeof(address), AF_INET6)) + { + closesocket(newsocket); + return INVALID_SOCKET; + } + } + + if (port == PORT_ANY) + { + address.sin6_port = 0; + } + else + { + address.sin6_port = htons((short)port); + } + + if (bind(newsocket, (const sockaddr *)&address, sizeof(address)) == SOCKET_ERROR) + { + Com_Printf("WARNING: NET_IP6Socket: bind: %s\n", NET_ErrorString()); + *err = socketError; + closesocket(newsocket); + return INVALID_SOCKET; + } + + if (bindto) *bindto = address; + + return newsocket; +} + +/* +==================== +NET_SetMulticast +Set the current multicast group +==================== +*/ +void NET_SetMulticast6(void) +{ + struct sockaddr_in6 addr; + + if (!*net_mcast6addr->string || + !Sys_StringToSockaddr(net_mcast6addr->string, (struct sockaddr *)&addr, sizeof(addr), AF_INET6)) + { + Com_Printf( + "WARNING: NET_JoinMulticast6: Incorrect multicast address given, " + "please set cvar %s to a sane value.\n", + net_mcast6addr->name); + + Cvar_SetValue(net_enabled->name, net_enabled->integer | NET_DISABLEMCAST); + + return; + } + + memcpy(&curgroup.ipv6mr_multiaddr, &addr.sin6_addr, sizeof(curgroup.ipv6mr_multiaddr)); + + if (*net_mcast6iface->string) + { +#ifdef _WIN32 + curgroup.ipv6mr_interface = net_mcast6iface->integer; +#else + curgroup.ipv6mr_interface = if_nametoindex(net_mcast6iface->string); +#endif + } + else + curgroup.ipv6mr_interface = 0; +} + +/* +==================== +NET_JoinMulticast +Join an ipv6 multicast group +==================== +*/ +void NET_JoinMulticast6(void) +{ + /* + TODO: accommodate + int err; + + if(ip6_socket == INVALID_SOCKET || multicast6_socket != INVALID_SOCKET || (net_enabled->integer & NET_DISABLEMCAST)) + return; + + if(IN6_IS_ADDR_MULTICAST(&boundto.sin6_addr) || IN6_IS_ADDR_UNSPECIFIED(&boundto.sin6_addr)) + { + // The way the socket was bound does not prohibit receiving multi-cast packets. So we don't need to open a + new one. + multicast6_socket = ip6_socket; + } + else + { + if((multicast6_socket = NET_IP6Socket(net_mcast6addr->string, ntohs(boundto.sin6_port), NULL, &err)) == + INVALID_SOCKET) + { + // If the OS does not support binding to multicast addresses, like WinXP, at least try with the + normal file descriptor. + multicast6_socket = ip6_socket; + } + } + + if(curgroup.ipv6mr_interface) + { + if (setsockopt(multicast6_socket, IPPROTO_IPV6, IPV6_MULTICAST_IF, + (char *) &curgroup.ipv6mr_interface, sizeof(curgroup.ipv6mr_interface)) < 0) + { + Com_Printf("NET_JoinMulticast6: Couldn't set scope on multicast socket: %s\n", NET_ErrorString()); + + if(multicast6_socket != ip6_socket) + { + closesocket(multicast6_socket); + multicast6_socket = INVALID_SOCKET; + return; + } + } + } + + if (setsockopt(multicast6_socket, IPPROTO_IPV6, IPV6_JOIN_GROUP, (char *) &curgroup, sizeof(curgroup))) + { + Com_Printf("NET_JoinMulticast6: Couldn't join multicast group: %s\n", NET_ErrorString()); + + if(multicast6_socket != ip6_socket) + { + closesocket(multicast6_socket); + multicast6_socket = INVALID_SOCKET; + return; + } + } + */ +} + +void NET_LeaveMulticast6() +{ + /* + TODO: accommodate + if(multicast6_socket != INVALID_SOCKET) + { + if(multicast6_socket != ip6_socket) + closesocket(multicast6_socket); + else + setsockopt(multicast6_socket, IPPROTO_IPV6, IPV6_LEAVE_GROUP, (char *) &curgroup, sizeof(curgroup)); + + multicast6_socket = INVALID_SOCKET; + } + */ +} + +/* +==================== +NET_OpenSocks +==================== +*/ +void NET_OpenSocks(int port) +{ + /* + TODO: accommodate + struct sockaddr_in address; + struct hostent *h; + int len; + bool rfc1929; + unsigned char buf[64]; + + usingSocks = false; + + Com_Printf( "Opening connection to SOCKS server.\n" ); + + if ( ( socks_socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ) == INVALID_SOCKET ) { + Com_Printf( "WARNING: NET_OpenSocks: socket: %s\n", NET_ErrorString() ); + return; + } + + h = gethostbyname( net_socksServer->string ); + if ( h == NULL ) { + Com_Printf( "WARNING: NET_OpenSocks: gethostbyname: %s\n", NET_ErrorString() ); + return; + } + if ( h->h_addrtype != AF_INET ) { + Com_Printf( "WARNING: NET_OpenSocks: gethostbyname: address type was not AF_INET\n" ); + return; + } + address.sin_family = AF_INET; + address.sin_addr.s_addr = *(int *)h->h_addr_list[0]; + address.sin_port = htons( (short)net_socksPort->integer ); + + if ( connect( socks_socket, (struct sockaddr *)&address, sizeof( address ) ) == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: connect: %s\n", NET_ErrorString() ); + return; + } + + // send socks authentication handshake + if ( *net_socksUsername->string || *net_socksPassword->string ) { + rfc1929 = true; + } + else { + rfc1929 = false; + } + + buf[0] = 5; // SOCKS version + // method count + if ( rfc1929 ) { + buf[1] = 2; + len = 4; + } + else { + buf[1] = 1; + len = 3; + } + buf[2] = 0; // method #1 - method id #00: no authentication + if ( rfc1929 ) { + buf[2] = 2; // method #2 - method id #02: username/password + } + if ( send( socks_socket, (void *)buf, len, 0 ) == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() ); + return; + } + + // get the response + len = recv( socks_socket, (void *)buf, 64, 0 ); + if ( len == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() ); + return; + } + if ( len != 2 || buf[0] != 5 ) { + Com_Printf( "NET_OpenSocks: bad response\n" ); + return; + } + switch( buf[1] ) { + case 0: // no authentication + break; + case 2: // username/password authentication + break; + default: + Com_Printf( "NET_OpenSocks: request denied\n" ); + return; + } + + // do username/password authentication if needed + if ( buf[1] == 2 ) { + int ulen; + int plen; + + // build the request + ulen = strlen( net_socksUsername->string ); + plen = strlen( net_socksPassword->string ); + + buf[0] = 1; // username/password authentication version + buf[1] = ulen; + if ( ulen ) { + memcpy( &buf[2], net_socksUsername->string, ulen ); + } + buf[2 + ulen] = plen; + if ( plen ) { + memcpy( &buf[3 + ulen], net_socksPassword->string, plen ); + } + + // send it + if ( send( socks_socket, (void *)buf, 3 + ulen + plen, 0 ) == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() ); + return; + } + + // get the response + len = recv( socks_socket, (void *)buf, 64, 0 ); + if ( len == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() ); + return; + } + if ( len != 2 || buf[0] != 1 ) { + Com_Printf( "NET_OpenSocks: bad response\n" ); + return; + } + if ( buf[1] != 0 ) { + Com_Printf( "NET_OpenSocks: authentication failed\n" ); + return; + } + } + + // send the UDP associate request + buf[0] = 5; // SOCKS version + buf[1] = 3; // command: UDP associate + buf[2] = 0; // reserved + buf[3] = 1; // address type: IPV4 + *(int *)&buf[4] = INADDR_ANY; + *(short *)&buf[8] = htons( (short)port ); // port + if ( send( socks_socket, (void *)buf, 10, 0 ) == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() ); + return; + } + + // get the response + len = recv( socks_socket, (void *)buf, 64, 0 ); + if( len == SOCKET_ERROR ) { + Com_Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() ); + return; + } + if( len < 2 || buf[0] != 5 ) { + Com_Printf( "NET_OpenSocks: bad response\n" ); + return; + } + // check completion code + if( buf[1] != 0 ) { + Com_Printf( "NET_OpenSocks: request denied: %i\n", buf[1] ); + return; + } + if( buf[3] != 1 ) { + Com_Printf( "NET_OpenSocks: relay address is not IPV4: %i\n", buf[3] ); + return; + } + ((struct sockaddr_in *)&socksRelayAddr)->sin_family = AF_INET; + ((struct sockaddr_in *)&socksRelayAddr)->sin_addr.s_addr = *(int *)&buf[4]; + ((struct sockaddr_in *)&socksRelayAddr)->sin_port = *(short *)&buf[8]; + memset( ((struct sockaddr_in *)&socksRelayAddr)->sin_zero, 0, 8 ); + + usingSocks = true; + */ +} + +/* +===================== +NET_AddLocalAddress +===================== +*/ +static void NET_AddLocalAddress(char *ifname, struct sockaddr *addr, struct sockaddr *netmask) +{ + int addrlen; + sa_family_t family; + + // only add addresses that have all required info. + if (!addr || !netmask || !ifname) return; + + family = addr->sa_family; + + if (numIP < MAX_IPS) + { + if (family == AF_INET) + { + addrlen = sizeof(struct sockaddr_in); + localIP[numIP].type = NA_IP; + } + else if (family == AF_INET6) + { + addrlen = sizeof(struct sockaddr_in6); + localIP[numIP].type = NA_IP6; + } + else + return; + + Q_strncpyz(localIP[numIP].ifname, ifname, sizeof(localIP[numIP].ifname)); + + localIP[numIP].family = family; + + memcpy(&localIP[numIP].addr, addr, addrlen); + memcpy(&localIP[numIP].netmask, netmask, addrlen); + + numIP++; + } +} + +#if defined(__linux__) || defined(__APPLE__) || defined(__BSD__) +static void NET_GetLocalAddress(void) +{ + struct ifaddrs *ifap, *search; + + numIP = 0; + + if (getifaddrs(&ifap)) + Com_Printf("NET_GetLocalAddress: Unable to get list of network interfaces: %s\n", NET_ErrorString()); + else + { + for (search = ifap; search; search = search->ifa_next) + { + // Only add interfaces that are up. + if (ifap->ifa_flags & IFF_UP) NET_AddLocalAddress(search->ifa_name, search->ifa_addr, search->ifa_netmask); + } + + freeifaddrs(ifap); + + Sys_ShowIP(); + } +} +#else +static void NET_GetLocalAddress(void) +{ + char hostname[256]; + struct addrinfo hint; + struct addrinfo *res = NULL; + + numIP = 0; + + if (gethostname(hostname, 256) == SOCKET_ERROR) return; + + memset(&hint, 0, sizeof(hint)); + + hint.ai_family = AF_UNSPEC; + hint.ai_socktype = SOCK_DGRAM; + + if (!getaddrinfo(hostname, NULL, &hint, &res)) + { + struct sockaddr_in mask4; + struct sockaddr_in6 mask6; + struct addrinfo *search; + + /* On operating systems where it's more difficult to find out the configured interfaces, we'll just assume a + * netmask with all bits set. */ + + memset(&mask4, 0, sizeof(mask4)); + memset(&mask6, 0, sizeof(mask6)); + mask4.sin_family = AF_INET; + memset(&mask4.sin_addr.s_addr, 0xFF, sizeof(mask4.sin_addr.s_addr)); + mask6.sin6_family = AF_INET6; + memset(&mask6.sin6_addr, 0xFF, sizeof(mask6.sin6_addr)); + + // add all IPs from returned list. + for (search = res; search; search = search->ai_next) + { + if (search->ai_family == AF_INET) + NET_AddLocalAddress("", search->ai_addr, (struct sockaddr *)&mask4); + else if (search->ai_family == AF_INET6) + NET_AddLocalAddress("", search->ai_addr, (struct sockaddr *)&mask6); + } + + Sys_ShowIP(); + } + + if (res) freeaddrinfo(res); +} +#endif + +/* +==================== +NET_OpenIP +==================== +*/ +void NET_OpenIP(void) +{ + int a; + int i; + int err; + int ports[3]; + int port6s[3]; + + for (a = 0; a < 3; ++a) + { + ports[a] = net_ports[a]->integer; + port6s[a] = net_port6s[a]->integer; + } + + NET_GetLocalAddress(); + + for (a = 0; a < 3; ++a) + { + // indent + if (a == 0 && (net_alternateProtocols->integer & NET_DISABLEPRIMPROTO)) continue; + if (a == 1 && !(net_alternateProtocols->integer & NET_ENABLEALT1PROTO)) continue; + if (a == 2 && !(net_alternateProtocols->integer & NET_ENABLEALT2PROTO)) continue; + + // automatically scan for a valid port, so multiple + // dedicated servers can be started without requiring + // a different net_port for each one + + if (net_enabled->integer & NET_ENABLEV6) + { + for (i = 0; i < 10; i++) + { + ip6_sockets[a] = NET_IP6Socket(a, net_ip6->string, port6s[a] + i, &boundto, &err); + if (ip6_sockets[a] != INVALID_SOCKET) + { + Cvar_SetValue((a == 2 ? "net_alt2port6" : a == 1 ? "net_alt1port6" : "net_port6"), port6s[a] + i); + break; + } + else + { + if (err == EAFNOSUPPORT) break; + } + } + if (ip6_sockets[a] == INVALID_SOCKET) + Com_Printf("WARNING: Couldn't bind to a%s v6 ip address.\n", + (a == 2 ? "n alternate-2" : a == 1 ? "n alternate-1" : "")); + } + + if (net_enabled->integer & NET_ENABLEV4) + { + for (i = 0; i < 10; i++) + { + ip_sockets[a] = NET_IPSocket(a, net_ip->string, ports[a] + i, &err); + if (ip_sockets[a] != INVALID_SOCKET) + { + Cvar_SetValue((a == 2 ? "net_alt2port" : a == 1 ? "net_alt1port" : "net_port"), ports[a] + i); + + if (net_socksEnabled->integer) NET_OpenSocks(ports[a] + i); + + break; + } + else + { + if (err == EAFNOSUPPORT) break; + } + } + + if (ip_sockets[a] == INVALID_SOCKET) + Com_Printf("WARNING: Couldn't bind to a%s v4 ip address.\n", + (a == 2 ? "n alternate-2" : a == 1 ? "n alternate-1" : "")); + } + // outdent + } +} + +//=================================================================== + +/* +==================== +NET_GetCvars +==================== +*/ +static bool NET_GetCvars(void) +{ + int modified; + int a; + +#ifdef DEDICATED + // I want server owners to explicitly turn on ipv6 support. + net_enabled = Cvar_Get("net_enabled", "1", CVAR_LATCH | CVAR_ARCHIVE); +#else + /* End users have it enabled so they can connect to ipv6-only hosts, but ipv4 will be + * used if available due to ping */ + net_enabled = Cvar_Get("net_enabled", "3", CVAR_LATCH | CVAR_ARCHIVE); +#endif + modified = net_enabled->modified; + net_enabled->modified = false; + + net_alternateProtocols = Cvar_Get("net_alternateProtocols", "3", CVAR_LATCH | CVAR_ARCHIVE); + modified += net_alternateProtocols->modified; + net_alternateProtocols->modified = false; + + net_ip = Cvar_Get("net_ip", "0.0.0.0", CVAR_LATCH); + modified += net_ip->modified; + net_ip->modified = false; + + net_ip6 = Cvar_Get("net_ip6", "::", CVAR_LATCH); + modified += net_ip6->modified; + net_ip6->modified = false; + + for (a = 0; a < 3; ++a) + { + net_ports[a] = Cvar_Get((a == 2 ? "net_alt2port" : a == 1 ? "net_alt1port" : "net_port"), + (a == 2 ? XSTRING(ALT2PORT_SERVER) : a == 1 ? XSTRING(ALT1PORT_SERVER) : XSTRING(PORT_SERVER)), CVAR_LATCH); + modified += net_ports[a]->modified; + net_ports[a]->modified = false; + + net_port6s[a] = Cvar_Get((a == 2 ? "net_alt2port6" : a == 1 ? "net_alt1port6" : "net_port6"), + (a == 2 ? XSTRING(ALT2PORT_SERVER) : a == 1 ? XSTRING(ALT1PORT_SERVER) : XSTRING(PORT_SERVER)), CVAR_LATCH); + modified += net_port6s[a]->modified; + net_port6s[a]->modified = false; + } + + // Some cvars for configuring multicast options which facilitates scanning for servers on local subnets. + net_mcast6addr = Cvar_Get("net_mcast6addr", NET_MULTICAST_IP6, CVAR_LATCH | CVAR_ARCHIVE); + modified += net_mcast6addr->modified; + net_mcast6addr->modified = false; + +#ifdef _WIN32 + net_mcast6iface = Cvar_Get("net_mcast6iface", "0", CVAR_LATCH | CVAR_ARCHIVE); +#else + net_mcast6iface = Cvar_Get("net_mcast6iface", "", CVAR_LATCH | CVAR_ARCHIVE); +#endif + modified += net_mcast6iface->modified; + net_mcast6iface->modified = false; + + net_socksEnabled = Cvar_Get("net_socksEnabled", "0", CVAR_LATCH | CVAR_ARCHIVE); + modified += net_socksEnabled->modified; + net_socksEnabled->modified = false; + + net_socksServer = Cvar_Get("net_socksServer", "", CVAR_LATCH | CVAR_ARCHIVE); + modified += net_socksServer->modified; + net_socksServer->modified = false; + + net_socksPort = Cvar_Get("net_socksPort", "1080", CVAR_LATCH | CVAR_ARCHIVE); + modified += net_socksPort->modified; + net_socksPort->modified = false; + + net_socksUsername = Cvar_Get("net_socksUsername", "", CVAR_LATCH | CVAR_ARCHIVE); + modified += net_socksUsername->modified; + net_socksUsername->modified = false; + + net_socksPassword = Cvar_Get("net_socksPassword", "", CVAR_LATCH | CVAR_ARCHIVE); + modified += net_socksPassword->modified; + net_socksPassword->modified = false; + + net_dropsim = Cvar_Get("net_dropsim", "", CVAR_TEMP); + + return modified ? true : false; +} + +/* +==================== +NET_Config +==================== +*/ +void NET_Config(bool enableNetworking) +{ + bool modified; + bool stop; + bool start; + int a; + + // get any latched changes to cvars + modified = NET_GetCvars(); + + if (!net_enabled->integer) + { + enableNetworking = false; + } + + // if enable state is the same and no cvars were modified, we have nothing to do + if (enableNetworking == networkingEnabled && !modified) + { + return; + } + + if (enableNetworking == networkingEnabled) + { + if (enableNetworking) + { + stop = true; + start = true; + } + else + { + stop = false; + start = false; + } + } + else + { + if (enableNetworking) + { + stop = false; + start = true; + } + else + { + stop = true; + start = false; + } + networkingEnabled = enableNetworking; + } + + if (stop) + { + for (a = 0; a < 3; ++a) + { + if (ip_sockets[a] != INVALID_SOCKET) + { + closesocket(ip_sockets[a]); + ip_sockets[a] = INVALID_SOCKET; + } + + if (ip6_sockets[a] != INVALID_SOCKET) + { + closesocket(ip6_sockets[a]); + ip6_sockets[a] = INVALID_SOCKET; + } + } + + /* + TODO: accommodate + if(multicast6_socket != INVALID_SOCKET) + { + if(multicast6_socket != ip6_socket) + closesocket(multicast6_socket); + + multicast6_socket = INVALID_SOCKET; + } + + if ( socks_socket != INVALID_SOCKET ) { + closesocket( socks_socket ); + socks_socket = INVALID_SOCKET; + } + */ + } + + if (start) + { + if (net_enabled->integer) + { + NET_OpenIP(); + NET_SetMulticast6(); + } + } +} + +/* +==================== +NET_Init +==================== +*/ +void NET_Init(void) +{ +#ifdef _WIN32 + int r; + + r = WSAStartup(MAKEWORD(1, 1), &winsockdata); + if (r) + { + Com_Printf("WARNING: Winsock initialization failed, returned %d\n", r); + return; + } + + winsockInitialized = true; + Com_Printf("Winsock Initialized\n"); +#endif + + NET_Config(true); + + Cmd_AddCommand("net_restart", NET_Restart_f); +} + +/* +==================== +NET_Shutdown +==================== +*/ +void NET_Shutdown(void) +{ + if (!networkingEnabled) + { + return; + } + + NET_Config(false); + +#ifdef _WIN32 + WSACleanup(); + winsockInitialized = false; +#endif +} + +/* +==================== +NET_Event + +Called from NET_Sleep which uses select() to determine which sockets have seen action. +==================== +*/ + +void NET_Event(fd_set *fdr) +{ + uint8_t bufData[MAX_MSGLEN + 1]; + netadr_t from; + msg_t netmsg; + + memset(&from, 0, sizeof(from)); + + while (1) + { + MSG_Init(&netmsg, bufData, sizeof(bufData)); + + if (NET_GetPacket(&from, &netmsg, fdr)) + { + if (net_dropsim->value > 0.0f && net_dropsim->value <= 100.0f) + { + // com_dropsim->value percent of incoming packets get dropped. + if (rand() < (int)(((double)RAND_MAX) / 100.0 * (double)net_dropsim->value)) + continue; // drop this packet + } + + if (com_sv_running->integer) + Com_RunAndTimeServerPacket(&from, &netmsg); + else + CL_PacketEvent(from, &netmsg); + } + else + break; + } +} + +/* +==================== +NET_Sleep + +Sleeps msec or until something happens on the network +==================== +*/ +void NET_Sleep(int msec) +{ + struct timeval timeout; + fd_set fdr; + int retval; + int a; + SOCKET highestfd = INVALID_SOCKET; + + if (msec < 0) msec = 0; + + FD_ZERO(&fdr); + + for (a = 0; a < 3; ++a) + { + if (ip_sockets[a] != INVALID_SOCKET) + { + FD_SET(ip_sockets[a], &fdr); + + if (highestfd == INVALID_SOCKET || ip_sockets[a] > highestfd) highestfd = ip_sockets[a]; + } + if (ip6_sockets[a] != INVALID_SOCKET) + { + FD_SET(ip6_sockets[a], &fdr); + + if (highestfd == INVALID_SOCKET || ip6_sockets[a] > highestfd) highestfd = ip6_sockets[a]; + } + } + +#ifdef _WIN32 + if (highestfd == INVALID_SOCKET) + { + // windows ain't happy when select is called without valid FDs + SleepEx(msec, 0); + return; + } +#endif + + timeout.tv_sec = msec / 1000; + timeout.tv_usec = (msec % 1000) * 1000; + + retval = select(highestfd + 1, &fdr, NULL, NULL, &timeout); + + if (retval == SOCKET_ERROR) + Com_Printf("Warning: select() syscall failed: %s\n", NET_ErrorString()); + else if (retval > 0) + NET_Event(&fdr); +} + +/* +==================== +NET_Restart_f +==================== +*/ +void NET_Restart_f(void) { NET_Config(true); } |