lhnet.c

   1
   2 // Written by Forest Hale 2003-06-15 and placed into public domain.
   3
   4 #ifndef STANDALONETEST
   5 #include "quakedef.h"
   6 #endif
   7
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <time.h>
  11 #include <string.h>
  12 #ifdef WIN32
  13 #include <winsock.h>
  14 #else
  15 #include <unistd.h>
  16 #include <sys/socket.h>
  17 #include <sys/ioctl.h>
  18 #include <errno.h>
  19 #include <netdb.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #endif
  23
  24 #ifdef __MORPHOS__
  25 #include <proto/socket.h>
  26 #endif
  27
  28 // for Z_Malloc/Z_Free in quake
  29 #ifndef STANDALONETEST
  30 #include "zone.h"
  31 #include "sys.h"
  32 #include "netconn.h"
  33 #else
  34 #define Con_Print printf
  35 #define Con_Printf printf
  36 #define Z_Malloc malloc
  37 #define Z_Free free
  38 #endif
  39
  40 #include "lhnet.h"
  41
  42 #if defined(WIN32)
  43 #define EWOULDBLOCK WSAEWOULDBLOCK
  44 #define ECONNREFUSED WSAECONNREFUSED
  45
  46 #define SOCKETERRNO WSAGetLastError()
  47
  48 #define IOC_VENDOR 0x18000000
  49 #define _WSAIOW(x,y) (IOC_IN|(x)|(y))
  50 #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
  51
  52 #define SOCKLEN_T int
  53 #elif defined(__MORPHOS__)
  54 #define ioctlsocket IoctlSocket
  55 #define closesocket CloseSocket
  56 #define SOCKETERRNO Errno()
  57
  58 #define SOCKLEN_T int
  59 #else
  60 #define ioctlsocket ioctl
  61 #define closesocket close
  62 #define SOCKETERRNO errno
  63
  64 #define SOCKLEN_T socklen_t
  65 #endif
  66
  67 // to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
  68 #define MAX_NAMECACHE 64
  69 static struct namecache_s
  70 {
  71         lhnetaddress_t address;
  72         double expirationtime;
  73         char name[64];
  74 }
  75 namecache[MAX_NAMECACHE];
  76 static int namecacheposition = 0;
  77
  78 int LHNETADDRESS_FromPort(lhnetaddress_t *address, int addresstype, int port)
  79 {
  80         if (!address)
  81                 return 0;
  82         switch(addresstype)
  83         {
  84         case LHNETADDRESSTYPE_LOOP:
  85                 // local:port  (loopback)
  86                 memset(address, 0, sizeof(*address));
  87                 address->addresstype = LHNETADDRESSTYPE_LOOP;
  88                 address->addressdata.loop.port = port;
  89                 return 1;
  90         case LHNETADDRESSTYPE_INET4:
  91                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
  92                 memset(address, 0, sizeof(*address));
  93                 address->addresstype = LHNETADDRESSTYPE_INET4;
  94                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
  95                 address->addressdata.inet4.port = htons((unsigned short)port);
  96                 return 1;
  97         case LHNETADDRESSTYPE_INET6:
  98                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
  99                 memset(address, 0, sizeof(*address));
 100                 address->addresstype = LHNETADDRESSTYPE_INET6;
 101                 address->addressdata.inet6.family = LHNETADDRESSTYPE_INET6_FAMILY;
 102                 address->addressdata.inet6.port = htons((unsigned short)port);
 103                 return 1;
 104         }
 105         return 0;
 106 }
 107
 108 int LHNETADDRESS_FromString(lhnetaddress_t *address, const char *string, int defaultport)
 109 {
 110         int i, port, namelen, d1, d2, d3, d4;
 111         struct hostent *hostentry;
 112         const char *colon;
 113         char name[128];
 114         if (!address || !string || !*string)
 115                 return 0;
 116         memset(address, 0, sizeof(*address));
 117         address->addresstype = LHNETADDRESSTYPE_NONE;
 118         port = 0;
 119         colon = strrchr(string, ':');
 120         if (colon)
 121                 port = atoi(colon + 1);
 122         else
 123                 colon = string + strlen(string);
 124         if (port == 0)
 125                 port = defaultport;
 126         namelen = colon - string;
 127         if (namelen > 127)
 128                 namelen = 127;
 129         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
 130         {
 131                 string++;
 132                 namelen -= 2;
 133         }
 134         memcpy(name, string, namelen);
 135         name[namelen] = 0;
 136         // handle loopback
 137         if (!strcmp(name, "local"))
 138         {
 139                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 140                 address->addressdata.loop.port = port;
 141                 return 1;
 142         }
 143         // try to parse as dotted decimal ipv4 address first
 144         // note this supports partial ip addresses
 145         d1 = d2 = d3 = d4 = 0;
 146         if (sscanf(name, "%d.%d.%d.%d", &d1, &d2, &d3, &d4) >= 1 && (unsigned int)d1 < 256 && (unsigned int)d2 < 256 && (unsigned int)d3 < 256 && (unsigned int)d4 < 256)
 147         {
 148                 // parsed a valid ipv4 address
 149                 address->addresstype = LHNETADDRESSTYPE_INET4;
 150                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
 151                 address->addressdata.inet4.port = htons((unsigned short)port);
 152                 address->addressdata.inet4.address[0] = (unsigned char)d1;
 153                 address->addressdata.inet4.address[1] = (unsigned char)d2;
 154                 address->addressdata.inet4.address[2] = (unsigned char)d3;
 155                 address->addressdata.inet4.address[3] = (unsigned char)d4;
 156 #ifdef STANDALONETEST
 157                 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));
 158 #endif
 159                 return 1;
 160         }
 161         for (i = 0;i < MAX_NAMECACHE;i++)
 162                 if (!strcmp(namecache[i].name, name))
 163                         break;
 164 #ifdef STANDALONETEST
 165         if (i < MAX_NAMECACHE)
 166 #else
 167         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 168 #endif
 169         {
 170                 *address = namecache[i].address;
 171                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 172                 {
 173                         address->addressdata.inet6.port = htons((unsigned short)port);
 174                         return 1;
 175                 }
 176                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 177                 {
 178                         address->addressdata.inet4.port = htons((unsigned short)port);
 179                         return 1;
 180                 }
 181                 return 0;
 182         }
 183         // try gethostbyname (handles dns and other ip formats)
 184         hostentry = gethostbyname(name);
 185         if (hostentry)
 186         {
 187                 if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET6_FAMILY)
 188                 {
 189                         // great it worked
 190                         address->addresstype = LHNETADDRESSTYPE_INET6;
 191                         address->addressdata.inet6.family = hostentry->h_addrtype;
 192                         address->addressdata.inet6.port = htons((unsigned short)port);
 193                         memcpy(address->addressdata.inet6.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet6.address));
 194                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 195                                 namecache[namecacheposition].name[i] = name[i];
 196                         namecache[namecacheposition].name[i] = 0;
 197 #ifndef STANDALONETEST
 198                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 199 #endif
 200                         namecache[namecacheposition].address = *address;
 201                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 202 #ifdef STANDALONETEST
 203                         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));
 204 #endif
 205                         return 1;
 206                 }
 207                 else if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET4_FAMILY)
 208                 {
 209                         // great it worked
 210                         address->addresstype = LHNETADDRESSTYPE_INET4;
 211                         address->addressdata.inet4.family = hostentry->h_addrtype;
 212                         address->addressdata.inet4.port = htons((unsigned short)port);
 213                         memcpy(address->addressdata.inet4.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet4.address));
 214                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 215                                 namecache[namecacheposition].name[i] = name[i];
 216                         namecache[namecacheposition].name[i] = 0;
 217 #ifndef STANDALONETEST
 218                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 219 #endif
 220                         namecache[namecacheposition].address = *address;
 221                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 222 #ifdef STANDALONETEST
 223                         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));
 224 #endif
 225                         return 1;
 226                 }
 227         }
 228 #ifdef STANDALONETEST
 229         printf("gethostbyname failed on address \"%s\"\n", name);
 230 #endif
 231         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 232                 namecache[namecacheposition].name[i] = name[i];
 233         namecache[namecacheposition].name[i] = 0;
 234 #ifndef STANDALONETEST
 235         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 236 #endif
 237         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 238         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 239         return 0;
 240 }
 241
 242 int LHNETADDRESS_ToString(const lhnetaddress_t *address, char *string, int stringbuffersize, int includeport)
 243 {
 244         *string = 0;
 245         if (!address || !string || stringbuffersize < 1)
 246                 return 0;
 247         switch(address->addresstype)
 248         {
 249         default:
 250                 break;
 251         case LHNETADDRESSTYPE_LOOP:
 252                 if (includeport)
 253                 {
 254                         if (stringbuffersize >= 12)
 255                         {
 256                                 sprintf(string, "local:%d", (int)address->addressdata.loop.port);
 257                                 return 1;
 258                         }
 259                 }
 260                 else
 261                 {
 262                         if (stringbuffersize >= 6)
 263                         {
 264                                 memcpy(string, "local", 6);
 265                                 return 1;
 266                         }
 267                 }
 268                 break;
 269         case LHNETADDRESSTYPE_INET4:
 270                 if (includeport)
 271                 {
 272                         if (stringbuffersize >= 22)
 273                         {
 274                                 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));
 275                                 return 1;
 276                         }
 277                 }
 278                 else
 279                 {
 280                         if (stringbuffersize >= 16)
 281                         {
 282                                 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]);
 283                                 return 1;
 284                         }
 285                 }
 286                 break;
 287         case LHNETADDRESSTYPE_INET6:
 288                 if (includeport)
 289                 {
 290                         if (stringbuffersize >= 88)
 291                         {
 292                                 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));
 293                                 return 1;
 294                         }
 295                 }
 296                 else
 297                 {
 298                         if (stringbuffersize >= 80)
 299                         {
 300                                 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]);
 301                                 return 1;
 302                         }
 303                 }
 304                 break;
 305         }
 306         return 0;
 307 }
 308
 309 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 310 {
 311         if (address)
 312                 return address->addresstype;
 313         else
 314                 return LHNETADDRESSTYPE_NONE;
 315 }
 316
 317 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 318 {
 319         if (!address)
 320                 return -1;
 321         switch(address->addresstype)
 322         {
 323         case LHNETADDRESSTYPE_LOOP:
 324                 return address->addressdata.loop.port;
 325         case LHNETADDRESSTYPE_INET4:
 326                 return ntohs(address->addressdata.inet4.port);
 327         case LHNETADDRESSTYPE_INET6:
 328                 return ntohs(address->addressdata.inet6.port);
 329         default:
 330                 return -1;
 331         }
 332 }
 333
 334 int LHNETADDRESS_SetPort(lhnetaddress_t *address, int port)
 335 {
 336         if (!address)
 337                 return 0;
 338         switch(address->addresstype)
 339         {
 340         case LHNETADDRESSTYPE_LOOP:
 341                 address->addressdata.loop.port = port;
 342                 return 1;
 343         case LHNETADDRESSTYPE_INET4:
 344                 address->addressdata.inet4.port = htons((unsigned short)port);
 345                 return 1;
 346         case LHNETADDRESSTYPE_INET6:
 347                 address->addressdata.inet6.port = htons((unsigned short)port);
 348                 return 1;
 349         default:
 350                 return 0;
 351         }
 352 }
 353
 354 int LHNETADDRESS_Compare(const lhnetaddress_t *address1, const lhnetaddress_t *address2)
 355 {
 356         if (!address1 || !address2)
 357                 return 1;
 358         if (address1->addresstype != address2->addresstype)
 359                 return 1;
 360         switch(address1->addresstype)
 361         {
 362         case LHNETADDRESSTYPE_LOOP:
 363                 if (address1->addressdata.loop.port != address2->addressdata.loop.port)
 364                         return -1;
 365                 return 0;
 366         case LHNETADDRESSTYPE_INET4:
 367                 if (address1->addressdata.inet4.family != address2->addressdata.inet4.family)
 368                         return 1;
 369                 if (memcmp(address1->addressdata.inet4.address, address2->addressdata.inet4.address, sizeof(address1->addressdata.inet4.address)))
 370                         return 1;
 371                 if (address1->addressdata.inet4.port != address2->addressdata.inet4.port)
 372                         return -1;
 373                 return 0;
 374         case LHNETADDRESSTYPE_INET6:
 375                 if (address1->addressdata.inet6.family != address2->addressdata.inet6.family)
 376                         return 1;
 377                 if (memcmp(address1->addressdata.inet6.address, address2->addressdata.inet6.address, sizeof(address1->addressdata.inet6.address)))
 378                         return 1;
 379                 if (address1->addressdata.inet6.port != address2->addressdata.inet6.port)
 380                         return -1;
 381                 return 0;
 382         default:
 383                 return 1;
 384         }
 385 }
 386
 387 typedef struct lhnetpacket_s
 388 {
 389         void *data;
 390         int length;
 391         int sourceport;
 392         int destinationport;
 393         time_t timeout;
 394 #ifndef STANDALONETEST
 395         double sentdoubletime;
 396 #endif
 397         struct lhnetpacket_s *next, *prev;
 398 }
 399 lhnetpacket_t;
 400
 401 static int lhnet_active;
 402 static lhnetsocket_t lhnet_socketlist;
 403 static lhnetpacket_t lhnet_packetlist;
 404 #ifdef WIN32
 405 static int lhnet_didWSAStartup = 0;
 406 static WSADATA lhnet_winsockdata;
 407 #endif
 408
 409 void LHNET_Init(void)
 410 {
 411         if (lhnet_active)
 412                 return;
 413         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 414         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 415         lhnet_active = 1;
 416 #ifdef WIN32
 417         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 418         if (!lhnet_didWSAStartup)
 419                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 420 #endif
 421 }
 422
 423 void LHNET_Shutdown(void)
 424 {
 425         lhnetpacket_t *p;
 426         if (!lhnet_active)
 427                 return;
 428         while (lhnet_socketlist.next != &lhnet_socketlist)
 429                 LHNET_CloseSocket(lhnet_socketlist.next);
 430         while (lhnet_packetlist.next != &lhnet_packetlist)
 431         {
 432                 p = lhnet_packetlist.next;
 433                 p->prev->next = p->next;
 434                 p->next->prev = p->prev;
 435                 Z_Free(p);
 436         }
 437 #ifdef WIN32
 438         if (lhnet_didWSAStartup)
 439         {
 440                 lhnet_didWSAStartup = 0;
 441                 WSACleanup();
 442         }
 443 #endif
 444         lhnet_active = 0;
 445 }
 446
 447 static const char *LHNETPRIVATE_StrError(void)
 448 {
 449 #ifdef WIN32
 450         int i = WSAGetLastError();
 451         switch (i)
 452         {
 453                 case WSAEINTR:           return "WSAEINTR";
 454                 case WSAEBADF:           return "WSAEBADF";
 455                 case WSAEACCES:          return "WSAEACCES";
 456                 case WSAEFAULT:          return "WSAEFAULT";
 457                 case WSAEINVAL:          return "WSAEINVAL";
 458                 case WSAEMFILE:          return "WSAEMFILE";
 459                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 460                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 461                 case WSAEALREADY:        return "WSAEALREADY";
 462                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 463                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 464                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 465                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 466                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 467                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 468                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 469                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 470                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 471                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 472                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 473                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 474                 case WSAENETDOWN:        return "WSAENETDOWN";
 475                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 476                 case WSAENETRESET:       return "WSAENETRESET";
 477                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 478                 case WSAECONNRESET:      return "WSAECONNRESET";
 479                 case WSAENOBUFS:         return "WSAENOBUFS";
 480                 case WSAEISCONN:         return "WSAEISCONN";
 481                 case WSAENOTCONN:        return "WSAENOTCONN";
 482                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 483                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 484                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 485                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 486                 case WSAELOOP:           return "WSAELOOP";
 487                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 488                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 489                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 490                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 491                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 492                 case WSAEUSERS:          return "WSAEUSERS";
 493                 case WSAEDQUOT:          return "WSAEDQUOT";
 494                 case WSAESTALE:          return "WSAESTALE";
 495                 case WSAEREMOTE:         return "WSAEREMOTE";
 496                 case WSAEDISCON:         return "WSAEDISCON";
 497                 case 0:                  return "no error";
 498                 default:                 return "unknown WSAE error";
 499         }
 500 #else
 501         return strerror(errno);
 502 #endif
 503 }
 504
 505 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 506 {
 507         fd_set fdreadset;
 508         struct timeval tv;
 509         int lastfd;
 510         lhnetsocket_t *s;
 511         FD_ZERO(&fdreadset);
 512         lastfd = 0;
 513         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 514         {
 515                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 516                 {
 517                         if (lastfd < s->inetsocket)
 518                                 lastfd = s->inetsocket;
 519                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 520                 }
 521         }
 522         tv.tv_sec = microseconds / 1000000;
 523         tv.tv_usec = microseconds % 1000000;
 524         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 525 }
 526
 527 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 528 {
 529         lhnetsocket_t *lhnetsocket, *s;
 530         if (!address)
 531                 return NULL;
 532         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 533         if (lhnetsocket)
 534         {
 535                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 536                 lhnetsocket->address = *address;
 537                 switch(lhnetsocket->address.addresstype)
 538                 {
 539                 case LHNETADDRESSTYPE_LOOP:
 540                         if (lhnetsocket->address.addressdata.loop.port == 0)
 541                         {
 542                                 // allocate a port dynamically
 543                                 // this search will always terminate because there is never
 544                                 // an allocated socket with port 0, so if the number wraps it
 545                                 // will find the port is unused, and then refuse to use port
 546                                 // 0, causing an intentional failure condition
 547                                 lhnetsocket->address.addressdata.loop.port = 1024;
 548                                 for (;;)
 549                                 {
 550                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 551                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 552                                                         break;
 553                                         if (s == &lhnet_socketlist)
 554                                                 break;
 555                                         lhnetsocket->address.addressdata.loop.port++;
 556                                 }
 557                         }
 558                         // check if the port is available
 559                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 560                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 561                                         break;
 562                         if (s == &lhnet_socketlist && lhnetsocket->address.addressdata.loop.port != 0)
 563                         {
 564                                 lhnetsocket->next = &lhnet_socketlist;
 565                                 lhnetsocket->prev = lhnetsocket->next->prev;
 566                                 lhnetsocket->next->prev = lhnetsocket;
 567                                 lhnetsocket->prev->next = lhnetsocket;
 568                                 return lhnetsocket;
 569                         }
 570                         break;
 571                 case LHNETADDRESSTYPE_INET4:
 572                 case LHNETADDRESSTYPE_INET6:
 573 #ifdef WIN32
 574                         if (lhnet_didWSAStartup)
 575                         {
 576 #endif
 577                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? LHNETADDRESSTYPE_INET6_FAMILY : LHNETADDRESSTYPE_INET4_FAMILY, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 578                                 {
 579 #ifdef WIN32
 580                                         u_long _true = 1;
 581                                         u_long _false = 0;
 582 #else
 583                                         char _true = 1;
 584 #endif
 585                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 586                                         {
 587                                                 SOCKLEN_T namelen;
 588                                                 namelen = address->addresstype == LHNETADDRESSTYPE_INET6 ? sizeof(lhnetsocket->address.addressdata.inet6) : sizeof(lhnetsocket->address.addressdata.inet4);
 589                                                 if (bind(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, namelen) != -1)
 590                                                 {
 591                                                         int i = 1;
 592                                                         getsockname(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, &namelen);
 593                                                         // enable broadcast on this socket
 594                                                         setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 595                                                         lhnetsocket->next = &lhnet_socketlist;
 596                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 597                                                         lhnetsocket->next->prev = lhnetsocket;
 598                                                         lhnetsocket->prev->next = lhnetsocket;
 599 #ifdef WIN32
 600                                                         if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 601                                                                 Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 602 #endif
 603                                                         return lhnetsocket;
 604                                                 }
 605                                                 else
 606                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 607                                         }
 608                                         else
 609                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 610                                         closesocket(lhnetsocket->inetsocket);
 611                                 }
 612                                 else
 613                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 614 #ifdef WIN32
 615                         }
 616                         else
 617                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 618 #endif
 619                         break;
 620                 default:
 621                         break;
 622                 }
 623                 Z_Free(lhnetsocket);
 624         }
 625         return NULL;
 626 }
 627
 628 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 629 {
 630         if (lhnetsocket)
 631         {
 632                 // unlink from socket list
 633                 if (lhnetsocket->next == NULL)
 634                         return; // invalid!
 635                 lhnetsocket->next->prev = lhnetsocket->prev;
 636                 lhnetsocket->prev->next = lhnetsocket->next;
 637                 lhnetsocket->next = NULL;
 638                 lhnetsocket->prev = NULL;
 639
 640                 // no special close code for loopback, just inet
 641                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 642                 {
 643                         closesocket(lhnetsocket->inetsocket);
 644                 }
 645                 Z_Free(lhnetsocket);
 646         }
 647 }
 648
 649 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 650 {
 651         if (sock)
 652                 return &sock->address;
 653         else
 654                 return NULL;
 655 }
 656
 657 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *address)
 658 {
 659         int value = 0;
 660         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 661                 return -1;
 662         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 663         {
 664                 time_t currenttime;
 665                 lhnetpacket_t *p, *pnext;
 666                 // scan for any old packets to timeout while searching for a packet
 667                 // that is waiting to be delivered to this socket
 668                 currenttime = time(NULL);
 669                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 670                 {
 671                         pnext = p->next;
 672                         if (p->timeout < currenttime)
 673                         {
 674                                 // unlink and free
 675                                 p->next->prev = p->prev;
 676                                 p->prev->next = p->next;
 677                                 Z_Free(p);
 678                                 continue;
 679                         }
 680 #ifndef STANDALONETEST
 681                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 682                                 continue;
 683 #endif
 684                         if (value == 0 && p->destinationport == lhnetsocket->address.addressdata.loop.port)
 685                         {
 686                                 if (p->length <= maxcontentlength)
 687                                 {
 688                                         *address = lhnetsocket->address;
 689                                         address->addressdata.loop.port = p->sourceport;
 690                                         memcpy(content, p->data, p->length);
 691                                         value = p->length;
 692                                 }
 693                                 else
 694                                         value = -1;
 695                                 // unlink and free
 696                                 p->next->prev = p->prev;
 697                                 p->prev->next = p->next;
 698                                 Z_Free(p);
 699                         }
 700                 }
 701         }
 702         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 703         {
 704                 unsigned int inetaddresslength;
 705                 address->addresstype = LHNETADDRESSTYPE_NONE;
 706                 inetaddresslength = sizeof(address->addressdata.inet4);
 707                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet4, &inetaddresslength);
 708                 if (value > 0)
 709                 {
 710                         address->addresstype = LHNETADDRESSTYPE_INET4;
 711                         return value;
 712                 }
 713                 else if (value == -1)
 714                 {
 715                         int e = SOCKETERRNO;
 716                         if (e == EWOULDBLOCK)
 717                                 return 0;
 718                         switch (e)
 719                         {
 720                                 case ECONNREFUSED:
 721                                         Con_Print("Connection refused\n");
 722                                         return 0;
 723                         }
 724                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 725                 }
 726         }
 727         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 728         {
 729                 unsigned int inetaddresslength;
 730                 address->addresstype = LHNETADDRESSTYPE_NONE;
 731                 inetaddresslength = sizeof(address->addressdata.inet6);
 732                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet6, &inetaddresslength);
 733                 if (value > 0)
 734                 {
 735                         address->addresstype = LHNETADDRESSTYPE_INET6;
 736                         return value;
 737                 }
 738                 else if (value == -1)
 739                 {
 740                         int e = SOCKETERRNO;
 741                         if (e == EWOULDBLOCK)
 742                                 return 0;
 743                         switch (e)
 744                         {
 745                                 case ECONNREFUSED:
 746                                         Con_Print("Connection refused\n");
 747                                         return 0;
 748                         }
 749                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 750                 }
 751         }
 752         return value;
 753 }
 754
 755 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *address)
 756 {
 757         int value = -1;
 758         if (!lhnetsocket || !address || !content || contentlength < 1)
 759                 return -1;
 760         if (lhnetsocket->address.addresstype != address->addresstype)
 761                 return -1;
 762         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 763         {
 764                 lhnetpacket_t *p;
 765                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 766                 p->data = (void *)(p + 1);
 767                 memcpy(p->data, content, contentlength);
 768                 p->length = contentlength;
 769                 p->sourceport = lhnetsocket->address.addressdata.loop.port;
 770                 p->destinationport = address->addressdata.loop.port;
 771                 p->timeout = time(NULL) + 10;
 772                 p->next = &lhnet_packetlist;
 773                 p->prev = p->next->prev;
 774                 p->next->prev = p;
 775                 p->prev->next = p;
 776 #ifndef STANDALONETEST
 777                 p->sentdoubletime = realtime;
 778 #endif
 779                 value = contentlength;
 780         }
 781         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 782         {
 783                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet4, sizeof(address->addressdata.inet4));
 784                 if (value == -1)
 785                 {
 786                         if (SOCKETERRNO == EWOULDBLOCK)
 787                                 return 0;
 788                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 789                 }
 790         }
 791         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 792         {
 793                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet6, sizeof(address->addressdata.inet6));
 794                 if (value == -1)
 795                 {
 796                         if (SOCKETERRNO == EWOULDBLOCK)
 797                                 return 0;
 798                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 799                 }
 800         }
 801         return value;
 802 }
 803
 804 #ifdef STANDALONETEST
 805 int main(int argc, char **argv)
 806 {
 807 #if 1
 808         char *buffer = "test", buffer2[1024];
 809         int blen = strlen(buffer);
 810         int b2len = 1024;
 811         lhnetsocket_t *sock1;
 812         lhnetsocket_t *sock2;
 813         lhnetaddress_t myaddy1;
 814         lhnetaddress_t myaddy2;
 815         lhnetaddress_t myaddy3;
 816         lhnetaddress_t localhostaddy1;
 817         lhnetaddress_t localhostaddy2;
 818         int test1;
 819         int test2;
 820
 821         printf("calling LHNET_Init\n");
 822         LHNET_Init();
 823
 824         printf("calling LHNET_FromPort twice to create two local addresses\n");
 825         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
 826         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
 827         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
 828         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
 829
 830         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
 831         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
 832         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
 833
 834         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
 835         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
 836         printf("sleeping briefly\n");
 837 #ifdef WIN32
 838         Sleep (100);
 839 #else
 840         usleep (100000);
 841 #endif
 842         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
 843         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
 844         if (test2 > 0)
 845                 Con_Printf("socket to socket test succeeded\n");
 846         else
 847                 Con_Printf("socket to socket test failed\n");
 848
 849 #ifdef WIN32
 850         printf("press any key to exit\n");
 851         getchar();
 852 #endif
 853
 854         printf("calling LHNET_Shutdown\n");
 855         LHNET_Shutdown();
 856         printf("exiting\n");
 857         return 0;
 858 #else
 859         lhnetsocket_t *sock[16], *sendsock;
 860         int i;
 861         int numsockets;
 862         int count;
 863         int length;
 864         int port;
 865         time_t oldtime;
 866         time_t newtime;
 867         char *sendmessage;
 868         int sendmessagelength;
 869         lhnetaddress_t destaddress;
 870         lhnetaddress_t receiveaddress;
 871         lhnetaddress_t sockaddress[16];
 872         char buffer[1536], addressstring[128], addressstring2[128];
 873         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 874         {
 875                 printf("calling LHNET_Init()\n");
 876                 LHNET_Init();
 877
 878                 numsockets = 0;
 879                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 880                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 881                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 882
 883                 sendsock = NULL;
 884                 sendmessage = NULL;
 885                 sendmessagelength = 0;
 886
 887                 for (i = 0;i < numsockets;i++)
 888                 {
 889                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 890                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 891                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 892                         {
 893                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 894                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 895                         }
 896                         else
 897                         {
 898                                 printf("failed to open socket\n");
 899                                 if (i == 0)
 900                                 {
 901                                         LHNET_Shutdown();
 902                                         return -1;
 903                                 }
 904                         }
 905                 }
 906                 count = 0;
 907                 if (argc == 5)
 908                 {
 909                         count = atoi(argv[2]);
 910                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 911                         {
 912                                 sendmessage = argv[4];
 913                                 sendmessagelength = strlen(sendmessage);
 914                                 sendsock = NULL;
 915                                 for (i = 0;i < numsockets;i++)
 916                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 917                                                 sendsock = sock[i];
 918                                 if (sendsock == NULL)
 919                                 {
 920                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 921                                         argc = 2;
 922                                 }
 923                         }
 924                         else
 925                         {
 926                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 927                                 argc = 2;
 928                         }
 929                 }
 930                 printf("started, now listening for \"exit\" on the opened sockets\n");
 931                 oldtime = time(NULL);
 932                 for(;;)
 933                 {
 934 #ifdef WIN32
 935                         Sleep(1);
 936 #else
 937                         usleep(1);
 938 #endif
 939                         for (i = 0;i < numsockets;i++)
 940                         {
 941                                 if (sock[i])
 942                                 {
 943                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 944                                         if (length < 0)
 945                                                 printf("localsock read error: length < 0");
 946                                         else if (length > 0 && length < (int)sizeof(buffer))
 947                                         {
 948                                                 buffer[length] = 0;
 949                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
 950                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 951                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
 952                                                 if (!strcmp(buffer, "exit"))
 953                                                         break;
 954                                         }
 955                                 }
 956                         }
 957                         if (i < numsockets)
 958                                 break;
 959                         if (argc == 5 && count > 0)
 960                         {
 961                                 newtime = time(NULL);
 962                                 if (newtime != oldtime)
 963                                 {
 964                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
 965                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
 966                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
 967                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
 968                                         if (length == sendmessagelength)
 969                                                 printf("sent successfully\n");
 970                                         else
 971                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
 972                                         oldtime = newtime;
 973                                         count--;
 974                                         if (count <= 0)
 975                                                 printf("Done sending, still listening for \"exit\"\n");
 976                                 }
 977                         }
 978                 }
 979                 for (i = 0;i < numsockets;i++)
 980                 {
 981                         if (sock[i])
 982                         {
 983                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 984                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
 985                                 LHNET_CloseSocket(sock[i]);
 986                         }
 987                 }
 988                 printf("calling LHNET_Shutdown()\n");
 989                 LHNET_Shutdown();
 990                 return 0;
 991         }
 992         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
 993         return -1;
 994 #endif
 995 }
 996 #endif
 997