lhnet.c

   1
   2 // Written by Forest Hale 2003-06-15 and placed into public domain.
   3
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <time.h>
   7 #include <string.h>
   8 #ifdef WIN32
   9 #include <winsock.h>
  10 #else
  11 #include <netdb.h>
  12 #include <netinet/in.h>
  13 //#include <arpa/inet.h>
  14 #include <unistd.h>
  15 #include <sys/socket.h>
  16 #include <sys/ioctl.h>
  17 #include <errno.h>
  18 #endif
  19
  20 // for Z_Malloc/Z_Free in quake
  21 #ifndef STANDALONETEST
  22 #include "quakedef.h"
  23 #include "zone.h"
  24 #include "sys.h"
  25 #include "netconn.h"
  26 #else
  27 #define Z_Malloc malloc
  28 #define Z_Free free
  29 #endif
  30
  31 #include "lhnet.h"
  32
  33 int LHNETADDRESS_FromPort(lhnetaddress_t *address, int addresstype, int port)
  34 {
  35         if (!address)
  36                 return 0;
  37         switch(addresstype)
  38         {
  39         case LHNETADDRESSTYPE_LOOP:
  40                 // local:port  (loopback)
  41                 memset(address, 0, sizeof(*address));
  42                 address->addresstype = LHNETADDRESSTYPE_LOOP;
  43                 address->addressdata.loop.port = port;
  44                 return 1;
  45         case LHNETADDRESSTYPE_INET4:
  46                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
  47                 memset(address, 0, sizeof(*address));
  48                 address->addresstype = LHNETADDRESSTYPE_INET4;
  49                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
  50                 address->addressdata.inet4.port = htons((unsigned short)port);
  51                 return 1;
  52         case LHNETADDRESSTYPE_INET6:
  53                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
  54                 memset(address, 0, sizeof(*address));
  55                 address->addresstype = LHNETADDRESSTYPE_INET6;
  56                 address->addressdata.inet6.family = LHNETADDRESSTYPE_INET6_FAMILY;
  57                 address->addressdata.inet6.port = htons((unsigned short)port);
  58                 return 1;
  59         }
  60         return 0;
  61 }
  62
  63 int LHNETADDRESS_FromString(lhnetaddress_t *address, const char *string, int defaultport)
  64 {
  65         int port, namelen, d1, d2, d3, d4;
  66         struct hostent *hostentry;
  67         const char *colon;
  68         char name[128];
  69         if (!address || !string)
  70                 return 0;
  71         memset(address, 0, sizeof(*address));
  72         address->addresstype = LHNETADDRESSTYPE_NONE;
  73         port = 0;
  74         colon = strrchr(string, ':');
  75         if (colon)
  76                 port = atoi(colon + 1);
  77         else
  78                 colon = string + strlen(string);
  79         if (port == 0)
  80                 port = defaultport;
  81         namelen = colon - string;
  82         if (namelen > 127)
  83                 namelen = 127;
  84         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
  85         {
  86                 string++;
  87                 namelen -= 2;
  88         }
  89         memcpy(name, string, namelen);
  90         name[namelen] = 0;
  91         // handle loopback
  92         if (!strcmp(name, "local"))
  93         {
  94                 address->addresstype = LHNETADDRESSTYPE_LOOP;
  95                 address->addressdata.loop.port = port;
  96                 return 1;
  97         }
  98         // try to parse as dotted decimal ipv4 address first
  99         if (sscanf(name, "%d.%d.%d.%d", &d1, &d2, &d3, &d4) == 4 && (unsigned int)d1 < 256 && (unsigned int)d2 < 256 && (unsigned int)d3 < 256 && (unsigned int)d4 < 256)
 100         {
 101                 // parsed a valid ipv4 address
 102                 address->addresstype = LHNETADDRESSTYPE_INET4;
 103                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
 104                 address->addressdata.inet4.port = htons((unsigned short)port);
 105                 address->addressdata.inet4.address[0] = (unsigned char)d1;
 106                 address->addressdata.inet4.address[1] = (unsigned char)d2;
 107                 address->addressdata.inet4.address[2] = (unsigned char)d3;
 108                 address->addressdata.inet4.address[3] = (unsigned char)d4;
 109 #ifdef STANDALONETEST
 110                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %d.%d.%d.%d:%d\n", string, (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3], (int)ntohs(address->addressdata.inet4.port));
 111 #endif
 112                 return 1;
 113         }
 114         // try gethostbyname (handles dns and other ip formats)
 115         hostentry = gethostbyname(name);
 116         if (hostentry)
 117         {
 118                 if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET6_FAMILY)
 119                 {
 120                         // great it worked
 121                         address->addresstype = LHNETADDRESSTYPE_INET6;
 122                         address->addressdata.inet6.family = hostentry->h_addrtype;
 123                         address->addressdata.inet6.port = htons((unsigned short)port);
 124                         memcpy(address->addressdata.inet6.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet6.address));
 125 #ifdef STANDALONETEST
 126                         printf("gethostbyname(\"%s\") returned ipv6 address [%x:%x:%x:%x:%x:%x:%x:%x]:%d\n", name, (int)address->addressdata.inet6.address[0], (int)address->addressdata.inet6.address[1], (int)address->addressdata.inet6.address[2], (int)address->addressdata.inet6.address[3], (int)address->addressdata.inet6.address[4], (int)address->addressdata.inet6.address[5], (int)address->addressdata.inet6.address[6], (int)address->addressdata.inet6.address[7], (int)ntohs(address->addressdata.inet6.port));
 127 #endif
 128                         return 1;
 129                 }
 130                 else if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET4_FAMILY)
 131                 {
 132                         // great it worked
 133                         address->addresstype = LHNETADDRESSTYPE_INET4;
 134                         address->addressdata.inet4.family = hostentry->h_addrtype;
 135                         address->addressdata.inet4.port = htons((unsigned short)port);
 136                         memcpy(address->addressdata.inet4.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet4.address));
 137 #ifdef STANDALONETEST
 138                         printf("gethostbyname(\"%s\") returned ipv4 address %d.%d.%d.%d:%d\n", name, (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3], (int)ntohs(address->addressdata.inet4.port));
 139 #endif
 140                         return 1;
 141                 }
 142         }
 143 #ifdef STANDALONETEST
 144         printf("gethostbyname failed on address \"%s\"\n", name);
 145 #endif
 146         return 0;
 147 }
 148
 149 int LHNETADDRESS_ToString(const lhnetaddress_t *address, char *string, int stringbuffersize, int includeport)
 150 {
 151         *string = 0;
 152         if (!address || !string || stringbuffersize < 1)
 153                 return 0;
 154         switch(address->addresstype)
 155         {
 156         default:
 157                 break;
 158         case LHNETADDRESSTYPE_LOOP:
 159                 if (includeport)
 160                 {
 161                         if (stringbuffersize >= 12)
 162                         {
 163                                 sprintf(string, "local:%d", (int)address->addressdata.loop.port);
 164                                 return 1;
 165                         }
 166                 }
 167                 else
 168                 {
 169                         if (stringbuffersize >= 6)
 170                         {
 171                                 strcpy(string, "local");
 172                                 return 1;
 173                         }
 174                 }
 175                 break;
 176         case LHNETADDRESSTYPE_INET4:
 177                 if (includeport)
 178                 {
 179                         if (stringbuffersize >= 22)
 180                         {
 181                                 sprintf(string, "%d.%d.%d.%d:%d", (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3], (int)ntohs(address->addressdata.inet4.port));
 182                                 return 1;
 183                         }
 184                 }
 185                 else
 186                 {
 187                         if (stringbuffersize >= 16)
 188                         {
 189                                 sprintf(string, "%d.%d.%d.%d", (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3]);
 190                                 return 1;
 191                         }
 192                 }
 193                 break;
 194         case LHNETADDRESSTYPE_INET6:
 195                 if (includeport)
 196                 {
 197                         if (stringbuffersize >= 88)
 198                         {
 199                                 sprintf(string, "[%x:%x:%x:%x:%x:%x:%x:%x]:%d", (int)address->addressdata.inet6.address[0], (int)address->addressdata.inet6.address[1], (int)address->addressdata.inet6.address[2], (int)address->addressdata.inet6.address[3], (int)address->addressdata.inet6.address[4], (int)address->addressdata.inet6.address[5], (int)address->addressdata.inet6.address[6], (int)address->addressdata.inet6.address[7], (int)ntohs(address->addressdata.inet6.port));
 200                                 return 1;
 201                         }
 202                 }
 203                 else
 204                 {
 205                         if (stringbuffersize >= 80)
 206                         {
 207                                 sprintf(string, "%x:%x:%x:%x:%x:%x:%x:%x", (int)address->addressdata.inet6.address[0], (int)address->addressdata.inet6.address[1], (int)address->addressdata.inet6.address[2], (int)address->addressdata.inet6.address[3], (int)address->addressdata.inet6.address[4], (int)address->addressdata.inet6.address[5], (int)address->addressdata.inet6.address[6], (int)address->addressdata.inet6.address[7]);
 208                                 return 1;
 209                         }
 210                 }
 211                 break;
 212         }
 213         return 0;
 214 }
 215
 216 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 217 {
 218         if (address)
 219                 return address->addresstype;
 220         else
 221                 return LHNETADDRESSTYPE_NONE;
 222 }
 223
 224 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 225 {
 226         if (!address)
 227                 return -1;
 228         switch(address->addresstype)
 229         {
 230         case LHNETADDRESSTYPE_LOOP:
 231                 return address->addressdata.loop.port;
 232         case LHNETADDRESSTYPE_INET4:
 233                 return ntohs(address->addressdata.inet4.port);
 234         case LHNETADDRESSTYPE_INET6:
 235                 return ntohs(address->addressdata.inet6.port);
 236         default:
 237                 return -1;
 238         }
 239 }
 240
 241 int LHNETADDRESS_SetPort(lhnetaddress_t *address, int port)
 242 {
 243         if (!address)
 244                 return 0;
 245         switch(address->addresstype)
 246         {
 247         case LHNETADDRESSTYPE_LOOP:
 248                 address->addressdata.loop.port = port;
 249                 return 1;
 250         case LHNETADDRESSTYPE_INET4:
 251                 address->addressdata.inet4.port = htons((unsigned short)port);
 252                 return 1;
 253         case LHNETADDRESSTYPE_INET6:
 254                 address->addressdata.inet6.port = htons((unsigned short)port);
 255                 return 1;
 256         default:
 257                 return 0;
 258         }
 259 }
 260
 261 int LHNETADDRESS_Compare(const lhnetaddress_t *address1, const lhnetaddress_t *address2)
 262 {
 263         if (!address1 || !address2)
 264                 return 1;
 265         if (address1->addresstype != address2->addresstype)
 266                 return 1;
 267         switch(address1->addresstype)
 268         {
 269         case LHNETADDRESSTYPE_LOOP:
 270                 if (address1->addressdata.loop.port != address2->addressdata.loop.port)
 271                         return -1;
 272                 return 0;
 273         case LHNETADDRESSTYPE_INET4:
 274                 if (address1->addressdata.inet4.family != address2->addressdata.inet4.family)
 275                         return 1;
 276                 if (memcmp(address1->addressdata.inet4.address, address2->addressdata.inet4.address, sizeof(address1->addressdata.inet4.address)))
 277                         return 1;
 278                 if (address1->addressdata.inet4.port != address2->addressdata.inet4.port)
 279                         return -1;
 280                 return 0;
 281         case LHNETADDRESSTYPE_INET6:
 282                 if (address1->addressdata.inet6.family != address2->addressdata.inet6.family)
 283                         return 1;
 284                 if (memcmp(address1->addressdata.inet6.address, address2->addressdata.inet6.address, sizeof(address1->addressdata.inet6.address)))
 285                         return 1;
 286                 if (address1->addressdata.inet6.port != address2->addressdata.inet6.port)
 287                         return -1;
 288                 return 0;
 289         default:
 290                 return 1;
 291         }
 292 }
 293
 294 typedef struct lhnetpacket_s
 295 {
 296         void *data;
 297         int length;
 298         int sourceport;
 299         int destinationport;
 300         time_t timeout;
 301 #ifndef STANDALONETEST
 302         double sentdoubletime;
 303 #endif
 304         struct lhnetpacket_s *next, *prev;
 305 }
 306 lhnetpacket_t;
 307
 308 static int lhnet_active;
 309 static lhnetsocket_t lhnet_socketlist;
 310 static lhnetpacket_t lhnet_packetlist;
 311 #ifdef WIN32
 312 static int lhnet_didWSAStartup = 0;
 313 static WSADATA lhnet_winsockdata;
 314 #endif
 315
 316 void LHNET_Init(void)
 317 {
 318         if (lhnet_active)
 319                 return;
 320         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 321         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 322         lhnet_active = 1;
 323 }
 324
 325 void LHNET_Shutdown(void)
 326 {
 327         lhnetpacket_t *p;
 328         if (!lhnet_active)
 329                 return;
 330         while (lhnet_socketlist.next != &lhnet_socketlist)
 331                 LHNET_CloseSocket(lhnet_socketlist.next);
 332         while (lhnet_packetlist.next != &lhnet_packetlist)
 333         {
 334                 p = lhnet_packetlist.next;
 335                 p->prev->next = p->next;
 336                 p->next->prev = p->prev;
 337                 Z_Free(p);
 338         }
 339         lhnet_active = 0;
 340 }
 341
 342 static const char *LHNETPRIVATE_StrError(void)
 343 {
 344 #ifdef WIN32
 345         int i = WSAGetLastError();
 346         switch (i)
 347         {
 348                 case WSAEINTR:           return "WSAEINTR";
 349                 case WSAEBADF:           return "WSAEBADF";
 350                 case WSAEACCES:          return "WSAEACCES";
 351                 case WSAEFAULT:          return "WSAEFAULT";
 352                 case WSAEINVAL:          return "WSAEINVAL";
 353                 case WSAEMFILE:          return "WSAEMFILE";
 354                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 355                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 356                 case WSAEALREADY:        return "WSAEALREADY";
 357                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 358                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 359                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 360                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 361                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 362                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 363                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 364                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 365                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 366                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 367                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 368                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 369                 case WSAENETDOWN:        return "WSAENETDOWN";
 370                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 371                 case WSAENETRESET:       return "WSAENETRESET";
 372                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 373                 case WSAECONNRESET:      return "WSAECONNRESET";
 374                 case WSAENOBUFS:         return "WSAENOBUFS";
 375                 case WSAEISCONN:         return "WSAEISCONN";
 376                 case WSAENOTCONN:        return "WSAENOTCONN";
 377                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 378                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 379                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 380                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 381                 case WSAELOOP:           return "WSAELOOP";
 382                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 383                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 384                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 385                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 386                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 387                 case WSAEUSERS:          return "WSAEUSERS";
 388                 case WSAEDQUOT:          return "WSAEDQUOT";
 389                 case WSAESTALE:          return "WSAESTALE";
 390                 case WSAEREMOTE:         return "WSAEREMOTE";
 391                 case WSAEDISCON:         return "WSAEDISCON";
 392                 case 0:                  return "no error";
 393                 default:                 return "unknown WSAE error";
 394         }
 395 #else
 396         return strerror(errno);
 397 #endif
 398 }
 399
 400 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 401 {
 402         lhnetsocket_t *lhnetsocket, *s;
 403         if (!address)
 404                 return NULL;
 405         lhnetsocket = Z_Malloc(sizeof(*lhnetsocket));
 406         if (lhnetsocket)
 407         {
 408                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 409                 lhnetsocket->address = *address;
 410                 switch(lhnetsocket->address.addresstype)
 411                 {
 412                 case LHNETADDRESSTYPE_LOOP:
 413                         if (lhnetsocket->address.addressdata.loop.port == 0)
 414                         {
 415                                 // allocate a port dynamically
 416                                 // this search will always terminate because there is never
 417                                 // an allocated socket with port 0, so if the number wraps it
 418                                 // will find the port is unused, and then refuse to use port
 419                                 // 0, causing an intentional failure condition
 420                                 lhnetsocket->address.addressdata.loop.port = 1024;
 421                                 for (;;)
 422                                 {
 423                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 424                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 425                                                         break;
 426                                         if (s == &lhnet_socketlist)
 427                                                 break;
 428                                         lhnetsocket->address.addressdata.loop.port++;
 429                                 }
 430                         }
 431                         // check if the port is available
 432                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 433                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 434                                         break;
 435                         if (s == &lhnet_socketlist && lhnetsocket->address.addressdata.loop.port != 0)
 436                         {
 437                                 lhnetsocket->next = &lhnet_socketlist;
 438                                 lhnetsocket->prev = lhnetsocket->next->prev;
 439                                 lhnetsocket->next->prev = lhnetsocket;
 440                                 lhnetsocket->prev->next = lhnetsocket;
 441                                 return lhnetsocket;
 442                         }
 443                         break;
 444                 case LHNETADDRESSTYPE_INET4:
 445                 case LHNETADDRESSTYPE_INET6:
 446 #ifdef WIN32
 447                         if (!lhnet_didWSAStartup && !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata))
 448                         {
 449                                 lhnet_didWSAStartup = 1;
 450 #else
 451                         {
 452 #endif
 453                                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 454                                         lhnetsocket->inetsocket = socket(LHNETADDRESSTYPE_INET6_FAMILY, SOCK_DGRAM, IPPROTO_UDP);
 455                                 else
 456                                         lhnetsocket->inetsocket = socket(LHNETADDRESSTYPE_INET4_FAMILY, SOCK_DGRAM, IPPROTO_UDP);
 457                                 if (lhnetsocket->inetsocket != -1)
 458                                 {
 459 #ifdef WIN32
 460                                         u_long _true = 1;
 461                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 462 #else
 463                                         char _true = 1;
 464                                         if (ioctl(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 465 #endif
 466                                         {
 467                                                 if (bind(lhnetsocket->inetsocket, (void *)&lhnetsocket->address.addressdata, address->addresstype == LHNETADDRESSTYPE_INET6 ? sizeof(lhnetsocket->address.addressdata.inet6) : sizeof(lhnetsocket->address.addressdata.inet4)) != -1)
 468                                                 {
 469                                                         lhnetsocket->next = &lhnet_socketlist;
 470                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 471                                                         lhnetsocket->next->prev = lhnetsocket;
 472                                                         lhnetsocket->prev->next = lhnetsocket;
 473                                                         return lhnetsocket;
 474                                                 }
 475                                                 else
 476                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 477                                         }
 478                                         else
 479                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 480 #ifdef WIN32
 481                                         closesocket(lhnetsocket->inetsocket);
 482 #else
 483                                         close(lhnetsocket->inetsocket);
 484 #endif
 485                                 }
 486                                 else
 487                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 488                         }
 489                         break;
 490                 default:
 491                         break;
 492                 }
 493                 Z_Free(lhnetsocket);
 494         }
 495         return NULL;
 496 }
 497
 498 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 499 {
 500         if (lhnetsocket)
 501         {
 502                 // unlink from socket list
 503                 if (lhnetsocket->next == NULL)
 504                         return; // invalid!
 505                 lhnetsocket->next->prev = lhnetsocket->prev;
 506                 lhnetsocket->prev->next = lhnetsocket->next;
 507                 lhnetsocket->next = NULL;
 508                 lhnetsocket->prev = NULL;
 509
 510                 // no special close code for loopback, just inet
 511                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 512                 {
 513 #ifdef WIN32
 514                         closesocket(lhnetsocket->inetsocket);
 515 #else
 516                         close(lhnetsocket->inetsocket);
 517 #endif
 518                 }
 519 #ifdef WIN32
 520                 if (lhnet_socketlist.next == &lhnet_socketlist && lhnet_didWSAStartup)
 521                 {
 522                         lhnet_didWSAStartup = 0;
 523                         WSACleanup();
 524                 }
 525 #endif
 526                 Z_Free(lhnetsocket);
 527         }
 528 }
 529
 530 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 531 {
 532         if (sock)
 533                 return &sock->address;
 534         else
 535                 return NULL;
 536 }
 537
 538 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *address)
 539 {
 540         int value = 0;
 541         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 542                 return -1;
 543         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 544         {
 545                 time_t currenttime;
 546                 lhnetpacket_t *p, *pnext;
 547                 // scan for any old packets to timeout while searching for a packet
 548                 // that is waiting to be delivered to this socket
 549                 currenttime = time(NULL);
 550                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 551                 {
 552                         pnext = p->next;
 553                         if (p->timeout < currenttime)
 554                         {
 555                                 // unlink and free
 556                                 p->next->prev = p->prev;
 557                                 p->prev->next = p->next;
 558                                 Z_Free(p);
 559                                 continue;
 560                         }
 561 #ifndef STANDALONETEST
 562                         if (p->sentdoubletime && Sys_DoubleTime() < p->sentdoubletime)
 563                                 continue;
 564 #endif
 565                         if (value == 0 && p->destinationport == lhnetsocket->address.addressdata.loop.port)
 566                         {
 567                                 if (p->length <= maxcontentlength)
 568                                 {
 569                                         *address = lhnetsocket->address;
 570                                         address->addressdata.loop.port = p->sourceport;
 571                                         memcpy(content, p->data, p->length);
 572                                         value = p->length;
 573                                 }
 574                                 else
 575                                         value = -1;
 576                                 // unlink and free
 577                                 p->next->prev = p->prev;
 578                                 p->prev->next = p->next;
 579                                 Z_Free(p);
 580                         }
 581                 }
 582         }
 583         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 584         {
 585                 int inetaddresslength;
 586                 address->addresstype = LHNETADDRESSTYPE_NONE;
 587                 inetaddresslength = sizeof(address->addressdata.inet4);
 588                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet4, &inetaddresslength);
 589                 if (value > 0)
 590                 {
 591                         address->addresstype = LHNETADDRESSTYPE_INET4;
 592                         return value;
 593                 }
 594                 else if (value == -1)
 595                 {
 596 #ifdef WIN32
 597                         int e = WSAGetLastError();
 598                         if (e == WSAEWOULDBLOCK)
 599                                 return 0;
 600                         switch (e)
 601                         {
 602                                 case WSAECONNREFUSED:
 603                                         Con_Printf("Connection refused\n");
 604                                         return 0;
 605                         }
 606 #else
 607                         if (errno == EWOULDBLOCK)
 608                                 return 0;
 609                         switch (errno)
 610                         {
 611                                 case ECONNREFUSED:
 612                                         Con_Printf("Connection refused\n");
 613                                         return 0;
 614                         }
 615 #endif
 616                 }
 617         }
 618         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 619         {
 620                 int inetaddresslength;
 621                 address->addresstype = LHNETADDRESSTYPE_NONE;
 622                 inetaddresslength = sizeof(address->addressdata.inet6);
 623                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet6, &inetaddresslength);
 624                 if (value > 0)
 625                 {
 626                         address->addresstype = LHNETADDRESSTYPE_INET6;
 627                         return value;
 628                 }
 629                 else if (value == -1)
 630                 {
 631 #ifdef WIN32
 632                         int e = WSAGetLastError();
 633                         if (e == WSAEWOULDBLOCK)
 634                                 return 0;
 635                         switch (e)
 636                         {
 637                                 case WSAECONNREFUSED:
 638                                         Con_Printf("Connection refused\n");
 639                                         return 0;
 640                         }
 641 #else
 642                         if (errno == EWOULDBLOCK)
 643                                 return 0;
 644                         switch (errno)
 645                         {
 646                                 case ECONNREFUSED:
 647                                         Con_Printf("Connection refused\n");
 648                                         return 0;
 649                         }
 650 #endif
 651                 }
 652         }
 653         return value;
 654 }
 655
 656 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *address)
 657 {
 658         int value = -1;
 659         if (!lhnetsocket || !address || !content || contentlength < 1)
 660                 return -1;
 661         if (lhnetsocket->address.addresstype != address->addresstype)
 662                 return -1;
 663         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 664         {
 665                 lhnetpacket_t *p;
 666                 p = Z_Malloc(sizeof(*p) + contentlength);
 667                 p->data = (void *)(p + 1);
 668                 memcpy(p->data, content, contentlength);
 669                 p->length = contentlength;
 670                 p->sourceport = lhnetsocket->address.addressdata.loop.port;
 671                 p->destinationport = address->addressdata.loop.port;
 672                 p->timeout = time(NULL) + 10;
 673                 p->next = &lhnet_packetlist;
 674                 p->prev = p->next->prev;
 675                 p->next->prev = p;
 676                 p->prev->next = p;
 677 #ifndef STANDALONETEST
 678                 if (cl_fakelocalping_min.integer || cl_fakelocalping_max.integer)
 679                         p->sentdoubletime = Sys_DoubleTime() + (cl_fakelocalping_min.integer + ((cl_fakelocalping_max.integer - cl_fakelocalping_min.integer) * (rand() & 255) / 256)) / 1000.0;
 680 #endif
 681                 value = contentlength;
 682         }
 683         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 684         {
 685                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet4, sizeof(address->addressdata.inet4));
 686                 if (value == -1)
 687                 {
 688 #ifdef WIN32
 689                         int e = WSAGetLastError();
 690                         if (e == WSAEWOULDBLOCK)
 691                                 return 0;
 692 #else
 693                         if (errno == EWOULDBLOCK)
 694                                 return 0;
 695 #endif
 696                 }
 697         }
 698         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 699         {
 700                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet6, sizeof(address->addressdata.inet6));
 701                 if (value == -1)
 702                 {
 703 #ifdef WIN32
 704                         int e = WSAGetLastError();
 705                         if (e == WSAEWOULDBLOCK)
 706                                 return 0;
 707 #else
 708                         if (errno == EWOULDBLOCK)
 709                                 return 0;
 710 #endif
 711                 }
 712         }
 713         return value;
 714 }
 715
 716 #ifdef STANDALONETEST
 717 int main(int argc, char **argv)
 718 {
 719         lhnetsocket_t *sock[16], *sendsock;
 720         int i;
 721         int numsockets;
 722         int count;
 723         int length;
 724         int port;
 725         time_t oldtime;
 726         time_t newtime;
 727         char *sendmessage;
 728         int sendmessagelength;
 729         lhnetaddress_t destaddress;
 730         lhnetaddress_t receiveaddress;
 731         lhnetaddress_t sockaddress[16];
 732         char buffer[1536], addressstring[128], addressstring2[128];
 733         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 734         {
 735                 printf("calling LHNET_Init()\n");
 736                 LHNET_Init();
 737
 738                 numsockets = 0;
 739                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 740                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 741                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 742
 743                 sendsock = NULL;
 744                 sendmessage = NULL;
 745                 sendmessagelength = 0;
 746
 747                 for (i = 0;i < numsockets;i++)
 748                 {
 749                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 750                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 751                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 752                         {
 753                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 754                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 755                         }
 756                         else
 757                         {
 758                                 printf("failed to open socket\n");
 759                                 if (i == 0)
 760                                 {
 761                                         LHNET_Shutdown();
 762                                         return -1;
 763                                 }
 764                         }
 765                 }
 766                 count = 0;
 767                 if (argc == 5)
 768                 {
 769                         count = atoi(argv[2]);
 770                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 771                         {
 772                                 sendmessage = argv[4];
 773                                 sendmessagelength = strlen(sendmessage);
 774                                 sendsock = NULL;
 775                                 for (i = 0;i < numsockets;i++)
 776                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 777                                                 sendsock = sock[i];
 778                                 if (sendsock == NULL)
 779                                 {
 780                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 781                                         argc = 2;
 782                                 }
 783                         }
 784                         else
 785                         {
 786                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 787                                 argc = 2;
 788                         }
 789                 }
 790                 printf("started, now listening for \"exit\" on the opened sockets\n");
 791                 oldtime = time(NULL);
 792                 for(;;)
 793                 {
 794 #ifdef WIN32
 795                         Sleep(1);
 796 #else
 797                         usleep(1);
 798 #endif
 799                         for (i = 0;i < numsockets;i++)
 800                         {
 801                                 if (sock[i])
 802                                 {
 803                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 804                                         if (length < 0)
 805                                                 printf("localsock read error: length < 0");
 806                                         else if (length > 0 && length < (int)sizeof(buffer))
 807                                         {
 808                                                 buffer[length] = 0;
 809                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
 810                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 811                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
 812                                                 if (!strcmp(buffer, "exit"))
 813                                                         break;
 814                                         }
 815                                 }
 816                         }
 817                         if (i < numsockets)
 818                                 break;
 819                         if (argc == 5 && count > 0)
 820                         {
 821                                 newtime = time(NULL);
 822                                 if (newtime != oldtime)
 823                                 {
 824                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
 825                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
 826                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
 827                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
 828                                         if (length == sendmessagelength)
 829                                                 printf("sent successfully\n");
 830                                         else
 831                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
 832                                         oldtime = newtime;
 833                                         count--;
 834                                         if (count <= 0)
 835                                                 printf("Done sending, still listening for \"exit\"\n");
 836                                 }
 837                         }
 838                 }
 839                 for (i = 0;i < numsockets;i++)
 840                 {
 841                         if (sock[i])
 842                         {
 843                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 844                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
 845                                 LHNET_CloseSocket(sock[i]);
 846                         }
 847                 }
 848                 printf("calling LHNET_Shutdown()\n");
 849                 LHNET_Shutdown();
 850                 return 0;
 851         }
 852         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
 853         return -1;
 854 }
 855 #endif
 856