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 <winsock2.h>
  14 #include <ws2tcpip.h>
  15 #else
  16 #include <unistd.h>
  17 #include <sys/types.h>
  18 #include <sys/socket.h>
  19 #include <sys/ioctl.h>
  20 #include <errno.h>
  21 #include <netdb.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #include <net/if.h>
  25 #endif
  26
  27 #ifdef __MORPHOS__
  28 #include <proto/socket.h>
  29 #endif
  30
  31 // for Z_Malloc/Z_Free in quake
  32 #ifndef STANDALONETEST
  33 #include "zone.h"
  34 #include "sys.h"
  35 #include "netconn.h"
  36 #else
  37 #define Con_Print printf
  38 #define Con_Printf printf
  39 #define Z_Malloc malloc
  40 #define Z_Free free
  41 #endif
  42
  43 #include "lhnet.h"
  44
  45 #if defined(WIN32)
  46 #define EWOULDBLOCK WSAEWOULDBLOCK
  47 #define ECONNREFUSED WSAECONNREFUSED
  48
  49 #define SOCKETERRNO WSAGetLastError()
  50
  51 #define IOC_VENDOR 0x18000000
  52 #define _WSAIOW(x,y) (IOC_IN|(x)|(y))
  53 #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
  54
  55 #define SOCKLEN_T int
  56 #elif defined(__MORPHOS__)
  57 #define ioctlsocket IoctlSocket
  58 #define closesocket CloseSocket
  59 #define SOCKETERRNO Errno()
  60
  61 #define SOCKLEN_T int
  62 #else
  63 #define ioctlsocket ioctl
  64 #define closesocket close
  65 #define SOCKETERRNO errno
  66
  67 #define SOCKLEN_T socklen_t
  68 #endif
  69
  70 typedef struct lhnetaddressnative_s
  71 {
  72         lhnetaddresstype_t addresstype;
  73         int port;
  74         union
  75         {
  76                 struct sockaddr sock;
  77                 struct sockaddr_in in;
  78                 struct sockaddr_in6 in6;
  79         }
  80         addr;
  81 }
  82 lhnetaddressnative_t;
  83
  84 // to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
  85 #define MAX_NAMECACHE 64
  86 static struct namecache_s
  87 {
  88         lhnetaddressnative_t address;
  89         double expirationtime;
  90         char name[64];
  91 }
  92 namecache[MAX_NAMECACHE];
  93 static int namecacheposition = 0;
  94
  95 int LHNETADDRESS_FromPort(lhnetaddress_t *vaddress, lhnetaddresstype_t addresstype, int port)
  96 {
  97         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
  98         if (!address)
  99                 return 0;
 100         switch(addresstype)
 101         {
 102         default:
 103                 return 0;
 104         case LHNETADDRESSTYPE_LOOP:
 105                 // local:port  (loopback)
 106                 memset(address, 0, sizeof(*address));
 107                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 108                 address->port = port;
 109                 return 1;
 110         case LHNETADDRESSTYPE_INET4:
 111                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
 112                 memset(address, 0, sizeof(*address));
 113                 address->addresstype = LHNETADDRESSTYPE_INET4;
 114                 address->port = port;
 115                 address->addr.in.sin_family = AF_INET;
 116                 address->addr.in.sin_port = htons((unsigned short)port);
 117                 return 1;
 118         case LHNETADDRESSTYPE_INET6:
 119                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
 120                 memset(address, 0, sizeof(*address));
 121                 address->addresstype = LHNETADDRESSTYPE_INET6;
 122                 address->port = port;
 123                 address->addr.in6.sin6_family = AF_INET6;
 124                 address->addr.in6.sin6_port = htons((unsigned short)port);
 125                 return 1;
 126         }
 127         return 0;
 128 }
 129
 130 int LHNETADDRESS_Resolve(lhnetaddressnative_t *address, const char *name, int port)
 131 {
 132         char port_buff [16];
 133         struct addrinfo hints;
 134         struct addrinfo* addrinf;
 135         int err;
 136
 137         dpsnprintf (port_buff, sizeof (port_buff), "%d", port);
 138         port_buff[sizeof (port_buff) - 1] = '\0';
 139
 140         memset(&hints, 0, sizeof (hints));
 141         hints.ai_family = AF_UNSPEC;
 142         hints.ai_socktype = SOCK_DGRAM;
 143         //hints.ai_flags = AI_PASSIVE;
 144
 145         err = getaddrinfo(name, port_buff, &hints, &addrinf);
 146         if (err != 0 || addrinf == NULL)
 147                 return 0;
 148         if (addrinf->ai_addr->sa_family != AF_INET6 && addrinf->ai_addr->sa_family != AF_INET)
 149                 return 0;
 150
 151         // great it worked
 152         if (addrinf->ai_addr->sa_family == AF_INET6)
 153         {
 154                 address->addresstype = LHNETADDRESSTYPE_INET6;
 155                 memcpy(&address->addr.in6, addrinf->ai_addr, sizeof(address->addr.in6));
 156         }
 157         else
 158         {
 159                 address->addresstype = LHNETADDRESSTYPE_INET4;
 160                 memcpy(&address->addr.in, addrinf->ai_addr, sizeof(address->addr.in));
 161         }
 162         address->port = port;
 163
 164         freeaddrinfo (addrinf);
 165         return 1;
 166 }
 167
 168 int LHNETADDRESS_FromString(lhnetaddress_t *vaddress, const char *string, int defaultport)
 169 {
 170         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 171         int i, port, d1, d2, d3, d4, resolved;
 172         size_t namelen;
 173         unsigned char *a;
 174         char name[128];
 175 #ifdef STANDALONETEST
 176         char string2[128];
 177 #endif
 178         const char* addr_start;
 179         const char* addr_end = NULL;
 180         const char* port_name = NULL;
 181         int addr_family = AF_UNSPEC;
 182
 183         if (!address || !string || !*string)
 184                 return 0;
 185         memset(address, 0, sizeof(*address));
 186         address->addresstype = LHNETADDRESSTYPE_NONE;
 187         port = 0;
 188
 189         // If it's a bracketed IPv6 address
 190         if (string[0] == '[')
 191         {
 192                 const char* end_bracket = strchr(string, ']');
 193
 194                 if (end_bracket == NULL)
 195                         return 0;
 196
 197                 if (end_bracket[1] == ':')
 198                         port_name = end_bracket + 2;
 199                 else if (end_bracket[1] != '\0')
 200                         return 0;
 201
 202                 addr_family = AF_INET6;
 203                 addr_start = &string[1];
 204                 addr_end = end_bracket;
 205         }
 206         else
 207         {
 208                 const char* first_colon;
 209
 210                 addr_start = string;
 211
 212                 // If it's a numeric non-bracket IPv6 address (-> no port),
 213                 // or it's a numeric IPv4 address, or a name, with a port
 214                 first_colon = strchr(string, ':');
 215                 if (first_colon != NULL)
 216                 {
 217                         const char* last_colon = strrchr(first_colon + 1, ':');
 218
 219                         // If it's an numeric IPv4 address, or a name, with a port
 220                         if (last_colon == NULL)
 221                         {
 222                                 addr_end = first_colon;
 223                                 port_name = first_colon + 1;
 224                         }
 225                         else
 226                                 addr_family = AF_INET6;
 227                 }
 228         }
 229
 230         if (addr_end != NULL)
 231                 namelen = addr_end - addr_start;
 232         else
 233                 namelen = strlen (addr_start);
 234
 235         if (namelen >= sizeof(name))
 236                 namelen = sizeof(name) - 1;
 237         memcpy (name, addr_start, namelen);
 238         name[namelen] = 0;
 239
 240         if (port_name)
 241                 port = atoi(port_name);
 242
 243         if (port == 0)
 244                 port = defaultport;
 245
 246         // handle loopback
 247         if (!strcmp(name, "local"))
 248         {
 249                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 250                 address->port = port;
 251                 return 1;
 252         }
 253         // try to parse as dotted decimal ipv4 address first
 254         // note this supports partial ip addresses
 255         d1 = d2 = d3 = d4 = 0;
 256 #if _MSC_VER >= 1400
 257 #define sscanf sscanf_s
 258 #endif
 259         if (addr_family != AF_INET6 &&
 260                 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)
 261         {
 262                 // parsed a valid ipv4 address
 263                 address->addresstype = LHNETADDRESSTYPE_INET4;
 264                 address->port = port;
 265                 address->addr.in.sin_family = AF_INET;
 266                 address->addr.in.sin_port = htons((unsigned short)port);
 267                 a = (unsigned char *)&address->addr.in.sin_addr;
 268                 a[0] = d1;
 269                 a[1] = d2;
 270                 a[2] = d3;
 271                 a[3] = d4;
 272 #ifdef STANDALONETEST
 273                 LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 274                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
 275 #endif
 276                 return 1;
 277         }
 278         for (i = 0;i < MAX_NAMECACHE;i++)
 279                 if (!strcmp(namecache[i].name, name))
 280                         break;
 281 #ifdef STANDALONETEST
 282         if (i < MAX_NAMECACHE)
 283 #else
 284         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 285 #endif
 286         {
 287                 *address = namecache[i].address;
 288                 address->port = port;
 289                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 290                 {
 291                         address->addr.in6.sin6_port = htons((unsigned short)port);
 292                         return 1;
 293                 }
 294                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 295                 {
 296                         address->addr.in.sin_port = htons((unsigned short)port);
 297                         return 1;
 298                 }
 299                 return 0;
 300         }
 301
 302         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 303                 namecache[namecacheposition].name[i] = name[i];
 304         namecache[namecacheposition].name[i] = 0;
 305 #ifndef STANDALONETEST
 306         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 307 #endif
 308
 309         // try resolving the address (handles dns and other ip formats)
 310         resolved = LHNETADDRESS_Resolve(address, name, port);
 311         if (resolved)
 312         {
 313 #ifdef STANDALONETEST
 314                 const char *protoname;
 315
 316                 switch (address->addresstype)
 317                 {
 318                         case LHNETADDRESSTYPE_INET6:
 319                                 protoname = "ipv6";
 320                                 break;
 321                         case LHNETADDRESSTYPE_INET4:
 322                                 protoname = "ipv4";
 323                                 break;
 324                         default:
 325                                 protoname = "UNKNOWN";
 326                                 break;
 327                 }
 328                 LHNETADDRESS_ToString(vaddress, string2, sizeof(string2), 1);
 329                 Con_Printf("LHNETADDRESS_Resolve(\"%s\") returned %s address %s\n", string, protoname, string2);
 330 #endif
 331                 namecache[namecacheposition].address = *address;
 332         }
 333         else
 334         {
 335 #ifdef STANDALONETEST
 336                 printf("name resolution failed on address \"%s\"\n", name);
 337 #endif
 338                 namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 339         }
 340
 341         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 342         return resolved;
 343 }
 344
 345 int LHNETADDRESS_ToString(const lhnetaddress_t *vaddress, char *string, int stringbuffersize, int includeport)
 346 {
 347         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 348         const unsigned char *a;
 349         *string = 0;
 350         if (!address || !string || stringbuffersize < 1)
 351                 return 0;
 352         switch(address->addresstype)
 353         {
 354         default:
 355                 break;
 356         case LHNETADDRESSTYPE_LOOP:
 357                 if (includeport)
 358                 {
 359                         if (stringbuffersize >= 12)
 360                         {
 361                                 dpsnprintf(string, stringbuffersize, "local:%d", address->port);
 362                                 return 1;
 363                         }
 364                 }
 365                 else
 366                 {
 367                         if (stringbuffersize >= 6)
 368                         {
 369                                 memcpy(string, "local", 6);
 370                                 return 1;
 371                         }
 372                 }
 373                 break;
 374         case LHNETADDRESSTYPE_INET4:
 375                 a = (const unsigned char *)(&address->addr.in.sin_addr);
 376                 if (includeport)
 377                 {
 378                         if (stringbuffersize >= 22)
 379                         {
 380                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d:%d", a[0], a[1], a[2], a[3], address->port);
 381                                 return 1;
 382                         }
 383                 }
 384                 else
 385                 {
 386                         if (stringbuffersize >= 16)
 387                         {
 388                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
 389                                 return 1;
 390                         }
 391                 }
 392                 break;
 393         case LHNETADDRESSTYPE_INET6:
 394                 a = (const unsigned char *)(&address->addr.in6.sin6_addr);
 395                 if (includeport)
 396                 {
 397                         if (stringbuffersize >= 88)
 398                         {
 399                                 dpsnprintf(string, stringbuffersize, "[%x:%x:%x:%x:%x:%x:%x:%x]:%d", a[0] * 256 + a[1], a[2] * 256 + a[3], a[4] * 256 + a[5], a[6] * 256 + a[7], a[8] * 256 + a[9], a[10] * 256 + a[11], a[12] * 256 + a[13], a[14] * 256 + a[15], address->port);
 400                                 return 1;
 401                         }
 402                 }
 403                 else
 404                 {
 405                         if (stringbuffersize >= 80)
 406                         {
 407                                 dpsnprintf(string, stringbuffersize, "%x:%x:%x:%x:%x:%x:%x:%x", a[0] * 256 + a[1], a[2] * 256 + a[3], a[4] * 256 + a[5], a[6] * 256 + a[7], a[8] * 256 + a[9], a[10] * 256 + a[11], a[12] * 256 + a[13], a[14] * 256 + a[15]);
 408                                 return 1;
 409                         }
 410                 }
 411                 break;
 412         }
 413         return 0;
 414 }
 415
 416 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 417 {
 418         if (address)
 419                 return address->addresstype;
 420         else
 421                 return LHNETADDRESSTYPE_NONE;
 422 }
 423
 424 const char *LHNETADDRESS_GetInterfaceName(const lhnetaddress_t *vaddress)
 425 {
 426         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 427
 428         if (address && address->addresstype == LHNETADDRESSTYPE_INET6)
 429         {
 430 #ifndef _WIN32
 431
 432                 static char ifname [IF_NAMESIZE];
 433
 434                 if (if_indextoname(address->addr.in6.sin6_scope_id, ifname) == ifname)
 435                         return ifname;
 436
 437 #else
 438
 439                 // The Win32 API doesn't have if_indextoname() until Windows Vista,
 440                 // but luckily it just uses the interface ID as the interface name
 441
 442                 static char ifname [16];
 443
 444                 if (dpsnprintf(ifname, sizeof(ifname), "%lu", address->addr.in6.sin6_scope_id) > 0)
 445                         return ifname;
 446
 447 #endif
 448         }
 449
 450         return NULL;
 451 }
 452
 453 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 454 {
 455         if (!address)
 456                 return -1;
 457         return address->port;
 458 }
 459
 460 int LHNETADDRESS_SetPort(lhnetaddress_t *vaddress, int port)
 461 {
 462         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 463         if (!address)
 464                 return 0;
 465         address->port = port;
 466         switch(address->addresstype)
 467         {
 468         case LHNETADDRESSTYPE_LOOP:
 469                 return 1;
 470         case LHNETADDRESSTYPE_INET4:
 471                 address->addr.in.sin_port = htons((unsigned short)port);
 472                 return 1;
 473         case LHNETADDRESSTYPE_INET6:
 474                 address->addr.in6.sin6_port = htons((unsigned short)port);
 475                 return 1;
 476         default:
 477                 return 0;
 478         }
 479 }
 480
 481 int LHNETADDRESS_Compare(const lhnetaddress_t *vaddress1, const lhnetaddress_t *vaddress2)
 482 {
 483         lhnetaddressnative_t *address1 = (lhnetaddressnative_t *)vaddress1;
 484         lhnetaddressnative_t *address2 = (lhnetaddressnative_t *)vaddress2;
 485         if (!address1 || !address2)
 486                 return 1;
 487         if (address1->addresstype != address2->addresstype)
 488                 return 1;
 489         switch(address1->addresstype)
 490         {
 491         case LHNETADDRESSTYPE_LOOP:
 492                 if (address1->port != address2->port)
 493                         return -1;
 494                 return 0;
 495         case LHNETADDRESSTYPE_INET4:
 496                 if (address1->addr.in.sin_family != address2->addr.in.sin_family)
 497                         return 1;
 498                 if (memcmp(&address1->addr.in.sin_addr, &address2->addr.in.sin_addr, sizeof(address1->addr.in.sin_addr)))
 499                         return 1;
 500                 if (address1->port != address2->port)
 501                         return -1;
 502                 return 0;
 503         case LHNETADDRESSTYPE_INET6:
 504                 if (address1->addr.in6.sin6_family != address2->addr.in6.sin6_family)
 505                         return 1;
 506                 if (memcmp(&address1->addr.in6.sin6_addr, &address2->addr.in6.sin6_addr, sizeof(address1->addr.in6.sin6_addr)))
 507                         return 1;
 508                 if (address1->port != address2->port)
 509                         return -1;
 510                 return 0;
 511         default:
 512                 return 1;
 513         }
 514 }
 515
 516 typedef struct lhnetpacket_s
 517 {
 518         void *data;
 519         int length;
 520         int sourceport;
 521         int destinationport;
 522         time_t timeout;
 523 #ifndef STANDALONETEST
 524         double sentdoubletime;
 525 #endif
 526         struct lhnetpacket_s *next, *prev;
 527 }
 528 lhnetpacket_t;
 529
 530 static int lhnet_active;
 531 static lhnetsocket_t lhnet_socketlist;
 532 static lhnetpacket_t lhnet_packetlist;
 533 #ifdef WIN32
 534 static int lhnet_didWSAStartup = 0;
 535 static WSADATA lhnet_winsockdata;
 536 #endif
 537
 538 void LHNET_Init(void)
 539 {
 540         if (lhnet_active)
 541                 return;
 542         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 543         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 544         lhnet_active = 1;
 545 #ifdef WIN32
 546         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 547         if (!lhnet_didWSAStartup)
 548                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 549 #endif
 550 }
 551
 552 void LHNET_Shutdown(void)
 553 {
 554         lhnetpacket_t *p;
 555         if (!lhnet_active)
 556                 return;
 557         while (lhnet_socketlist.next != &lhnet_socketlist)
 558                 LHNET_CloseSocket(lhnet_socketlist.next);
 559         while (lhnet_packetlist.next != &lhnet_packetlist)
 560         {
 561                 p = lhnet_packetlist.next;
 562                 p->prev->next = p->next;
 563                 p->next->prev = p->prev;
 564                 Z_Free(p);
 565         }
 566 #ifdef WIN32
 567         if (lhnet_didWSAStartup)
 568         {
 569                 lhnet_didWSAStartup = 0;
 570                 WSACleanup();
 571         }
 572 #endif
 573         lhnet_active = 0;
 574 }
 575
 576 static const char *LHNETPRIVATE_StrError(void)
 577 {
 578 #ifdef WIN32
 579         int i = WSAGetLastError();
 580         switch (i)
 581         {
 582                 case WSAEINTR:           return "WSAEINTR";
 583                 case WSAEBADF:           return "WSAEBADF";
 584                 case WSAEACCES:          return "WSAEACCES";
 585                 case WSAEFAULT:          return "WSAEFAULT";
 586                 case WSAEINVAL:          return "WSAEINVAL";
 587                 case WSAEMFILE:          return "WSAEMFILE";
 588                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 589                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 590                 case WSAEALREADY:        return "WSAEALREADY";
 591                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 592                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 593                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 594                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 595                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 596                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 597                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 598                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 599                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 600                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 601                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 602                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 603                 case WSAENETDOWN:        return "WSAENETDOWN";
 604                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 605                 case WSAENETRESET:       return "WSAENETRESET";
 606                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 607                 case WSAECONNRESET:      return "WSAECONNRESET";
 608                 case WSAENOBUFS:         return "WSAENOBUFS";
 609                 case WSAEISCONN:         return "WSAEISCONN";
 610                 case WSAENOTCONN:        return "WSAENOTCONN";
 611                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 612                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 613                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 614                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 615                 case WSAELOOP:           return "WSAELOOP";
 616                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 617                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 618                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 619                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 620                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 621                 case WSAEUSERS:          return "WSAEUSERS";
 622                 case WSAEDQUOT:          return "WSAEDQUOT";
 623                 case WSAESTALE:          return "WSAESTALE";
 624                 case WSAEREMOTE:         return "WSAEREMOTE";
 625                 case WSAEDISCON:         return "WSAEDISCON";
 626                 case 0:                  return "no error";
 627                 default:                 return "unknown WSAE error";
 628         }
 629 #else
 630         return strerror(errno);
 631 #endif
 632 }
 633
 634 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 635 {
 636         fd_set fdreadset;
 637         struct timeval tv;
 638         int lastfd;
 639         lhnetsocket_t *s;
 640         FD_ZERO(&fdreadset);
 641         lastfd = 0;
 642         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 643         {
 644                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 645                 {
 646                         if (lastfd < s->inetsocket)
 647                                 lastfd = s->inetsocket;
 648                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 649                 }
 650         }
 651         tv.tv_sec = microseconds / 1000000;
 652         tv.tv_usec = microseconds % 1000000;
 653         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 654 }
 655
 656 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 657 {
 658         lhnetsocket_t *lhnetsocket, *s;
 659         if (!address)
 660                 return NULL;
 661         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 662         if (lhnetsocket)
 663         {
 664                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 665                 lhnetsocket->address = *address;
 666                 switch(lhnetsocket->address.addresstype)
 667                 {
 668                 case LHNETADDRESSTYPE_LOOP:
 669                         if (lhnetsocket->address.port == 0)
 670                         {
 671                                 // allocate a port dynamically
 672                                 // this search will always terminate because there is never
 673                                 // an allocated socket with port 0, so if the number wraps it
 674                                 // will find the port is unused, and then refuse to use port
 675                                 // 0, causing an intentional failure condition
 676                                 lhnetsocket->address.port = 1024;
 677                                 for (;;)
 678                                 {
 679                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 680                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 681                                                         break;
 682                                         if (s == &lhnet_socketlist)
 683                                                 break;
 684                                         lhnetsocket->address.port++;
 685                                 }
 686                         }
 687                         // check if the port is available
 688                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 689                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 690                                         break;
 691                         if (s == &lhnet_socketlist && lhnetsocket->address.port != 0)
 692                         {
 693                                 lhnetsocket->next = &lhnet_socketlist;
 694                                 lhnetsocket->prev = lhnetsocket->next->prev;
 695                                 lhnetsocket->next->prev = lhnetsocket;
 696                                 lhnetsocket->prev->next = lhnetsocket;
 697                                 return lhnetsocket;
 698                         }
 699                         break;
 700                 case LHNETADDRESSTYPE_INET4:
 701                 case LHNETADDRESSTYPE_INET6:
 702 #ifdef WIN32
 703                         if (lhnet_didWSAStartup)
 704                         {
 705 #endif
 706                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? PF_INET6 : PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 707                                 {
 708 #ifdef WIN32
 709                                         u_long _true = 1;
 710                                         u_long _false = 0;
 711 #else
 712                                         char _true = 1;
 713 #endif
 714                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 715                                         {
 716 #ifdef IPV6_V6ONLY
 717                                                 // We need to set this flag to tell the OS that we only listen on IPv6. If we don't
 718                                                 // most OSes will create a dual-protocol socket that also listens on IPv4. In this case
 719                                                 // if an IPv4 socket is already bound to the port we want, our bind() call will fail.
 720                                                 int ipv6_only = 1;
 721                                                 if (address->addresstype != LHNETADDRESSTYPE_INET6
 722                                                         || setsockopt (lhnetsocket->inetsocket, IPPROTO_IPV6, IPV6_V6ONLY,
 723                                                                                    (const void *)&ipv6_only, sizeof(ipv6_only)) == 0
 724 #ifdef WIN32
 725                                                         // The Win32 API only supports IPV6_V6ONLY since Windows Vista, but fortunately
 726                                                         // the default value is what we want on Win32 anyway (IPV6_V6ONLY = true)
 727                                                         || SOCKETERRNO == WSAENOPROTOOPT
 728 #endif
 729                                                         )
 730 #endif
 731                                                 {
 732                                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 733                                                         SOCKLEN_T namelen;
 734                                                         int bindresult;
 735                                                         if (address->addresstype == LHNETADDRESSTYPE_INET6)
 736                                                         {
 737                                                                 namelen = sizeof(localaddress->addr.in6);
 738                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 739                                                                 if (bindresult != -1)
 740                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 741                                                         }
 742                                                         else
 743                                                         {
 744                                                                 namelen = sizeof(localaddress->addr.in);
 745                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 746                                                                 if (bindresult != -1)
 747                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 748                                                         }
 749                                                         if (bindresult != -1)
 750                                                         {
 751                                                                 int i = 1;
 752                                                                 // enable broadcast on this socket
 753                                                                 setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 754                                                                 lhnetsocket->next = &lhnet_socketlist;
 755                                                                 lhnetsocket->prev = lhnetsocket->next->prev;
 756                                                                 lhnetsocket->next->prev = lhnetsocket;
 757                                                                 lhnetsocket->prev->next = lhnetsocket;
 758 #ifdef WIN32
 759                                                                 if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 760                                                                         Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 761 #endif
 762                                                                 return lhnetsocket;
 763                                                         }
 764                                                         else
 765                                                                 Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 766                                                 }
 767 #ifdef IPV6_V6ONLY
 768                                                 else
 769                                                         Con_Printf("LHNET_OpenSocket_Connectionless: setsockopt(IPV6_V6ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
 770 #endif
 771                                         }
 772                                         else
 773                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 774                                         closesocket(lhnetsocket->inetsocket);
 775                                 }
 776                                 else
 777                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 778 #ifdef WIN32
 779                         }
 780                         else
 781                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 782 #endif
 783                         break;
 784                 default:
 785                         break;
 786                 }
 787                 Z_Free(lhnetsocket);
 788         }
 789         return NULL;
 790 }
 791
 792 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 793 {
 794         if (lhnetsocket)
 795         {
 796                 // unlink from socket list
 797                 if (lhnetsocket->next == NULL)
 798                         return; // invalid!
 799                 lhnetsocket->next->prev = lhnetsocket->prev;
 800                 lhnetsocket->prev->next = lhnetsocket->next;
 801                 lhnetsocket->next = NULL;
 802                 lhnetsocket->prev = NULL;
 803
 804                 // no special close code for loopback, just inet
 805                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 806                 {
 807                         closesocket(lhnetsocket->inetsocket);
 808                 }
 809                 Z_Free(lhnetsocket);
 810         }
 811 }
 812
 813 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 814 {
 815         if (sock)
 816                 return &sock->address;
 817         else
 818                 return NULL;
 819 }
 820
 821 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *vaddress)
 822 {
 823         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 824         int value = 0;
 825         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 826                 return -1;
 827         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 828         {
 829                 time_t currenttime;
 830                 lhnetpacket_t *p, *pnext;
 831                 // scan for any old packets to timeout while searching for a packet
 832                 // that is waiting to be delivered to this socket
 833                 currenttime = time(NULL);
 834                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 835                 {
 836                         pnext = p->next;
 837                         if (p->timeout < currenttime)
 838                         {
 839                                 // unlink and free
 840                                 p->next->prev = p->prev;
 841                                 p->prev->next = p->next;
 842                                 Z_Free(p);
 843                                 continue;
 844                         }
 845 #ifndef STANDALONETEST
 846                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 847                                 continue;
 848 #endif
 849                         if (value == 0 && p->destinationport == lhnetsocket->address.port)
 850                         {
 851                                 if (p->length <= maxcontentlength)
 852                                 {
 853                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 854                                         *address = *localaddress;
 855                                         address->port = p->sourceport;
 856                                         memcpy(content, p->data, p->length);
 857                                         value = p->length;
 858                                 }
 859                                 else
 860                                         value = -1;
 861                                 // unlink and free
 862                                 p->next->prev = p->prev;
 863                                 p->prev->next = p->next;
 864                                 Z_Free(p);
 865                         }
 866                 }
 867         }
 868         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 869         {
 870                 unsigned int inetaddresslength;
 871                 address->addresstype = LHNETADDRESSTYPE_NONE;
 872                 inetaddresslength = sizeof(address->addr.in);
 873                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, &address->addr.sock, &inetaddresslength);
 874                 if (value > 0)
 875                 {
 876                         address->addresstype = LHNETADDRESSTYPE_INET4;
 877                         address->port = ntohs(address->addr.in.sin_port);
 878                         return value;
 879                 }
 880                 else if (value == -1)
 881                 {
 882                         int e = SOCKETERRNO;
 883                         if (e == EWOULDBLOCK)
 884                                 return 0;
 885                         switch (e)
 886                         {
 887                                 case ECONNREFUSED:
 888                                         Con_Print("Connection refused\n");
 889                                         return 0;
 890                         }
 891                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 892                 }
 893         }
 894         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 895         {
 896                 unsigned int inetaddresslength;
 897                 address->addresstype = LHNETADDRESSTYPE_NONE;
 898                 inetaddresslength = sizeof(address->addr.in6);
 899                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, &address->addr.sock, &inetaddresslength);
 900                 if (value > 0)
 901                 {
 902                         address->addresstype = LHNETADDRESSTYPE_INET6;
 903                         address->port = ntohs(address->addr.in6.sin6_port);
 904                         return value;
 905                 }
 906                 else if (value == -1)
 907                 {
 908                         int e = SOCKETERRNO;
 909                         if (e == EWOULDBLOCK)
 910                                 return 0;
 911                         switch (e)
 912                         {
 913                                 case ECONNREFUSED:
 914                                         Con_Print("Connection refused\n");
 915                                         return 0;
 916                         }
 917                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 918                 }
 919         }
 920         return value;
 921 }
 922
 923 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *vaddress)
 924 {
 925         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 926         int value = -1;
 927         if (!lhnetsocket || !address || !content || contentlength < 1)
 928                 return -1;
 929         if (lhnetsocket->address.addresstype != address->addresstype)
 930                 return -1;
 931         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 932         {
 933                 lhnetpacket_t *p;
 934                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 935                 p->data = (void *)(p + 1);
 936                 memcpy(p->data, content, contentlength);
 937                 p->length = contentlength;
 938                 p->sourceport = lhnetsocket->address.port;
 939                 p->destinationport = address->port;
 940                 p->timeout = time(NULL) + 10;
 941                 p->next = &lhnet_packetlist;
 942                 p->prev = p->next->prev;
 943                 p->next->prev = p;
 944                 p->prev->next = p;
 945 #ifndef STANDALONETEST
 946                 p->sentdoubletime = realtime;
 947 #endif
 948                 value = contentlength;
 949         }
 950         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 951         {
 952                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addr.in, sizeof(struct sockaddr_in));
 953                 if (value == -1)
 954                 {
 955                         if (SOCKETERRNO == EWOULDBLOCK)
 956                                 return 0;
 957                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 958                 }
 959         }
 960         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 961         {
 962                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addr.in6, sizeof(struct sockaddr_in6));
 963                 if (value == -1)
 964                 {
 965                         if (SOCKETERRNO == EWOULDBLOCK)
 966                                 return 0;
 967                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 968                 }
 969         }
 970         return value;
 971 }
 972
 973 #ifdef STANDALONETEST
 974 int main(int argc, char **argv)
 975 {
 976 #if 1
 977         char *buffer = "test", buffer2[1024];
 978         int blen = strlen(buffer);
 979         int b2len = 1024;
 980         lhnetsocket_t *sock1;
 981         lhnetsocket_t *sock2;
 982         lhnetaddress_t myaddy1;
 983         lhnetaddress_t myaddy2;
 984         lhnetaddress_t myaddy3;
 985         lhnetaddress_t localhostaddy1;
 986         lhnetaddress_t localhostaddy2;
 987         int test1;
 988         int test2;
 989
 990         printf("calling LHNET_Init\n");
 991         LHNET_Init();
 992
 993         printf("calling LHNET_FromPort twice to create two local addresses\n");
 994         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
 995         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
 996         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
 997         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
 998
 999         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
1000         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
1001         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
1002
1003         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
1004         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
1005         printf("sleeping briefly\n");
1006 #ifdef WIN32
1007         Sleep (100);
1008 #else
1009         usleep (100000);
1010 #endif
1011         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
1012         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
1013         if (test2 > 0)
1014                 Con_Printf("socket to socket test succeeded\n");
1015         else
1016                 Con_Printf("socket to socket test failed\n");
1017
1018 #ifdef WIN32
1019         printf("press any key to exit\n");
1020         getchar();
1021 #endif
1022
1023         printf("calling LHNET_Shutdown\n");
1024         LHNET_Shutdown();
1025         printf("exiting\n");
1026         return 0;
1027 #else
1028         lhnetsocket_t *sock[16], *sendsock;
1029         int i;
1030         int numsockets;
1031         int count;
1032         int length;
1033         int port;
1034         time_t oldtime;
1035         time_t newtime;
1036         char *sendmessage;
1037         int sendmessagelength;
1038         lhnetaddress_t destaddress;
1039         lhnetaddress_t receiveaddress;
1040         lhnetaddress_t sockaddress[16];
1041         char buffer[1536], addressstring[128], addressstring2[128];
1042         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
1043         {
1044                 printf("calling LHNET_Init()\n");
1045                 LHNET_Init();
1046
1047                 numsockets = 0;
1048                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
1049                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
1050                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
1051
1052                 sendsock = NULL;
1053                 sendmessage = NULL;
1054                 sendmessagelength = 0;
1055
1056                 for (i = 0;i < numsockets;i++)
1057                 {
1058                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
1059                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
1060                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
1061                         {
1062                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1063                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
1064                         }
1065                         else
1066                         {
1067                                 printf("failed to open socket\n");
1068                                 if (i == 0)
1069                                 {
1070                                         LHNET_Shutdown();
1071                                         return -1;
1072                                 }
1073                         }
1074                 }
1075                 count = 0;
1076                 if (argc == 5)
1077                 {
1078                         count = atoi(argv[2]);
1079                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
1080                         {
1081                                 sendmessage = argv[4];
1082                                 sendmessagelength = strlen(sendmessage);
1083                                 sendsock = NULL;
1084                                 for (i = 0;i < numsockets;i++)
1085                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
1086                                                 sendsock = sock[i];
1087                                 if (sendsock == NULL)
1088                                 {
1089                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
1090                                         argc = 2;
1091                                 }
1092                         }
1093                         else
1094                         {
1095                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
1096                                 argc = 2;
1097                         }
1098                 }
1099                 printf("started, now listening for \"exit\" on the opened sockets\n");
1100                 oldtime = time(NULL);
1101                 for(;;)
1102                 {
1103 #ifdef WIN32
1104                         Sleep(1);
1105 #else
1106                         usleep(1);
1107 #endif
1108                         for (i = 0;i < numsockets;i++)
1109                         {
1110                                 if (sock[i])
1111                                 {
1112                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
1113                                         if (length < 0)
1114                                                 printf("localsock read error: length < 0");
1115                                         else if (length > 0 && length < (int)sizeof(buffer))
1116                                         {
1117                                                 buffer[length] = 0;
1118                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
1119                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1120                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
1121                                                 if (!strcmp(buffer, "exit"))
1122                                                         break;
1123                                         }
1124                                 }
1125                         }
1126                         if (i < numsockets)
1127                                 break;
1128                         if (argc == 5 && count > 0)
1129                         {
1130                                 newtime = time(NULL);
1131                                 if (newtime != oldtime)
1132                                 {
1133                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
1134                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
1135                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
1136                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
1137                                         if (length == sendmessagelength)
1138                                                 printf("sent successfully\n");
1139                                         else
1140                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
1141                                         oldtime = newtime;
1142                                         count--;
1143                                         if (count <= 0)
1144                                                 printf("Done sending, still listening for \"exit\"\n");
1145                                 }
1146                         }
1147                 }
1148                 for (i = 0;i < numsockets;i++)
1149                 {
1150                         if (sock[i])
1151                         {
1152                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1153                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
1154                                 LHNET_CloseSocket(sock[i]);
1155                         }
1156                 }
1157                 printf("calling LHNET_Shutdown()\n");
1158                 LHNET_Shutdown();
1159                 return 0;
1160         }
1161         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
1162         return -1;
1163 #endif
1164 }
1165 #endif
1166