lhnet.c

   1
   2 // Written by Forest Hale 2003-06-15 and placed into public domain.
   3
   4 #ifdef WIN32
   5 #ifdef _MSC_VER
   6 #pragma comment(lib, "ws2_32.lib")
   7 #endif
   8 # ifdef SUPPORTIPV6
   9 // Windows XP or higher is required for getaddrinfo, but the inclusion of wspiapi provides fallbacks for older versions
  10 # define _WIN32_WINNT 0x0501
  11 # endif
  12 # include <winsock2.h>
  13 # include <ws2tcpip.h>
  14 # ifdef USE_WSPIAPI_H
  15 #  include <wspiapi.h>
  16 # endif
  17 #endif
  18
  19 #ifndef STANDALONETEST
  20 #include "quakedef.h"
  21 #endif
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <time.h>
  26 #include <string.h>
  27 #ifndef WIN32
  28 #include <unistd.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <sys/ioctl.h>
  32 #include <errno.h>
  33 #include <netdb.h>
  34 #include <netinet/in.h>
  35 #include <arpa/inet.h>
  36 #ifdef SUPPORTIPV6
  37 #include <net/if.h>
  38 #endif
  39 #endif
  40
  41 #ifdef __MORPHOS__
  42 #include <proto/socket.h>
  43 #endif
  44
  45 // for Z_Malloc/Z_Free in quake
  46 #ifndef STANDALONETEST
  47 #include "zone.h"
  48 #include "sys.h"
  49 #include "netconn.h"
  50 #else
  51 #define Con_Print printf
  52 #define Con_Printf printf
  53 #define Z_Malloc malloc
  54 #define Z_Free free
  55 #endif
  56
  57 #include "lhnet.h"
  58
  59 #if defined(WIN32)
  60 #define EWOULDBLOCK WSAEWOULDBLOCK
  61 #define ECONNREFUSED WSAECONNREFUSED
  62
  63 #define SOCKETERRNO WSAGetLastError()
  64
  65 #define IOC_VENDOR 0x18000000
  66 #define _WSAIOW(x,y) (IOC_IN|(x)|(y))
  67 #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
  68
  69 #define SOCKLEN_T int
  70 #elif defined(__MORPHOS__)
  71 #define ioctlsocket IoctlSocket
  72 #define closesocket CloseSocket
  73 #define SOCKETERRNO Errno()
  74
  75 #define SOCKLEN_T int
  76 #else
  77 #define ioctlsocket ioctl
  78 #define closesocket close
  79 #define SOCKETERRNO errno
  80
  81 #define SOCKLEN_T socklen_t
  82 #endif
  83
  84 #ifdef MSG_DONTWAIT
  85 #define LHNET_RECVFROM_FLAGS MSG_DONTWAIT
  86 #define LHNET_SENDTO_FLAGS 0
  87 #else
  88 #define LHNET_RECVFROM_FLAGS 0
  89 #define LHNET_SENDTO_FLAGS 0
  90 #endif
  91
  92 typedef struct lhnetaddressnative_s
  93 {
  94         lhnetaddresstype_t addresstype;
  95         int port;
  96         union
  97         {
  98                 struct sockaddr sock;
  99                 struct sockaddr_in in;
 100 #ifdef SUPPORTIPV6
 101                 struct sockaddr_in6 in6;
 102 #endif
 103         }
 104         addr;
 105 }
 106 lhnetaddressnative_t;
 107
 108 // to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
 109 #define MAX_NAMECACHE 64
 110 static struct namecache_s
 111 {
 112         lhnetaddressnative_t address;
 113         double expirationtime;
 114         char name[64];
 115 }
 116 namecache[MAX_NAMECACHE];
 117 static int namecacheposition = 0;
 118
 119 int LHNETADDRESS_FromPort(lhnetaddress_t *vaddress, lhnetaddresstype_t addresstype, int port)
 120 {
 121         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 122         if (!address)
 123                 return 0;
 124         switch(addresstype)
 125         {
 126         default:
 127                 break;
 128         case LHNETADDRESSTYPE_LOOP:
 129                 // local:port  (loopback)
 130                 memset(address, 0, sizeof(*address));
 131                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 132                 address->port = port;
 133                 return 1;
 134         case LHNETADDRESSTYPE_INET4:
 135                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
 136                 memset(address, 0, sizeof(*address));
 137                 address->addresstype = LHNETADDRESSTYPE_INET4;
 138                 address->port = port;
 139                 address->addr.in.sin_family = AF_INET;
 140                 address->addr.in.sin_port = htons((unsigned short)port);
 141                 return 1;
 142 #ifdef SUPPORTIPV6
 143         case LHNETADDRESSTYPE_INET6:
 144                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
 145                 memset(address, 0, sizeof(*address));
 146                 address->addresstype = LHNETADDRESSTYPE_INET6;
 147                 address->port = port;
 148                 address->addr.in6.sin6_family = AF_INET6;
 149                 address->addr.in6.sin6_port = htons((unsigned short)port);
 150                 return 1;
 151 #endif
 152         }
 153         return 0;
 154 }
 155
 156 #ifdef SUPPORTIPV6
 157 int LHNETADDRESS_Resolve(lhnetaddressnative_t *address, const char *name, int port)
 158 {
 159         char port_buff [16];
 160         struct addrinfo hints;
 161         struct addrinfo* addrinf;
 162         int err;
 163
 164         dpsnprintf (port_buff, sizeof (port_buff), "%d", port);
 165         port_buff[sizeof (port_buff) - 1] = '\0';
 166
 167         memset(&hints, 0, sizeof (hints));
 168         hints.ai_family = AF_UNSPEC;
 169         hints.ai_socktype = SOCK_DGRAM;
 170         //hints.ai_flags = AI_PASSIVE;
 171
 172         err = getaddrinfo(name, port_buff, &hints, &addrinf);
 173         if (err != 0 || addrinf == NULL)
 174                 return 0;
 175         if (addrinf->ai_addr->sa_family != AF_INET6 && addrinf->ai_addr->sa_family != AF_INET)
 176         {
 177                 freeaddrinfo (addrinf);
 178                 return 0;
 179         }
 180
 181         // great it worked
 182         if (addrinf->ai_addr->sa_family == AF_INET6)
 183         {
 184                 address->addresstype = LHNETADDRESSTYPE_INET6;
 185                 memcpy(&address->addr.in6, addrinf->ai_addr, sizeof(address->addr.in6));
 186         }
 187         else
 188         {
 189                 address->addresstype = LHNETADDRESSTYPE_INET4;
 190                 memcpy(&address->addr.in, addrinf->ai_addr, sizeof(address->addr.in));
 191         }
 192         address->port = port;
 193
 194         freeaddrinfo (addrinf);
 195         return 1;
 196 }
 197
 198 int LHNETADDRESS_FromString(lhnetaddress_t *vaddress, const char *string, int defaultport)
 199 {
 200         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 201         int i, port, d1, d2, d3, d4, resolved;
 202         size_t namelen;
 203         unsigned char *a;
 204         char name[128];
 205 #ifdef STANDALONETEST
 206         char string2[128];
 207 #endif
 208         const char* addr_start;
 209         const char* addr_end = NULL;
 210         const char* port_name = NULL;
 211         int addr_family = AF_UNSPEC;
 212
 213         if (!address || !string || !*string)
 214                 return 0;
 215         memset(address, 0, sizeof(*address));
 216         address->addresstype = LHNETADDRESSTYPE_NONE;
 217         port = 0;
 218
 219         // If it's a bracketed IPv6 address
 220         if (string[0] == '[')
 221         {
 222                 const char* end_bracket = strchr(string, ']');
 223
 224                 if (end_bracket == NULL)
 225                         return 0;
 226
 227                 if (end_bracket[1] == ':')
 228                         port_name = end_bracket + 2;
 229                 else if (end_bracket[1] != '\0')
 230                         return 0;
 231
 232                 addr_family = AF_INET6;
 233                 addr_start = &string[1];
 234                 addr_end = end_bracket;
 235         }
 236         else
 237         {
 238                 const char* first_colon;
 239
 240                 addr_start = string;
 241
 242                 // If it's a numeric non-bracket IPv6 address (-> no port),
 243                 // or it's a numeric IPv4 address, or a name, with a port
 244                 first_colon = strchr(string, ':');
 245                 if (first_colon != NULL)
 246                 {
 247                         const char* last_colon = strrchr(first_colon + 1, ':');
 248
 249                         // If it's an numeric IPv4 address, or a name, with a port
 250                         if (last_colon == NULL)
 251                         {
 252                                 addr_end = first_colon;
 253                                 port_name = first_colon + 1;
 254                         }
 255                         else
 256                                 addr_family = AF_INET6;
 257                 }
 258         }
 259
 260         if (addr_end != NULL)
 261                 namelen = addr_end - addr_start;
 262         else
 263                 namelen = strlen (addr_start);
 264
 265         if (namelen >= sizeof(name))
 266                 namelen = sizeof(name) - 1;
 267         memcpy (name, addr_start, namelen);
 268         name[namelen] = 0;
 269
 270         if (port_name)
 271                 port = atoi(port_name);
 272
 273         if (port == 0)
 274                 port = defaultport;
 275
 276         // handle loopback
 277         if (!strcmp(name, "local"))
 278         {
 279                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 280                 address->port = port;
 281                 return 1;
 282         }
 283         // try to parse as dotted decimal ipv4 address first
 284         // note this supports partial ip addresses
 285         d1 = d2 = d3 = d4 = 0;
 286 #if _MSC_VER >= 1400
 287 #define sscanf sscanf_s
 288 #endif
 289         if (addr_family != AF_INET6 &&
 290                 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)
 291         {
 292                 // parsed a valid ipv4 address
 293                 address->addresstype = LHNETADDRESSTYPE_INET4;
 294                 address->port = port;
 295                 address->addr.in.sin_family = AF_INET;
 296                 address->addr.in.sin_port = htons((unsigned short)port);
 297                 a = (unsigned char *)&address->addr.in.sin_addr;
 298                 a[0] = d1;
 299                 a[1] = d2;
 300                 a[2] = d3;
 301                 a[3] = d4;
 302 #ifdef STANDALONETEST
 303                 LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 304                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
 305 #endif
 306                 return 1;
 307         }
 308         for (i = 0;i < MAX_NAMECACHE;i++)
 309                 if (!strcmp(namecache[i].name, name))
 310                         break;
 311 #ifdef STANDALONETEST
 312         if (i < MAX_NAMECACHE)
 313 #else
 314         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 315 #endif
 316         {
 317                 *address = namecache[i].address;
 318                 address->port = port;
 319                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 320                 {
 321                         address->addr.in6.sin6_port = htons((unsigned short)port);
 322                         return 1;
 323                 }
 324                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 325                 {
 326                         address->addr.in.sin_port = htons((unsigned short)port);
 327                         return 1;
 328                 }
 329                 return 0;
 330         }
 331
 332         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 333                 namecache[namecacheposition].name[i] = name[i];
 334         namecache[namecacheposition].name[i] = 0;
 335 #ifndef STANDALONETEST
 336         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 337 #endif
 338
 339         // try resolving the address (handles dns and other ip formats)
 340         resolved = LHNETADDRESS_Resolve(address, name, port);
 341         if (resolved)
 342         {
 343 #ifdef STANDALONETEST
 344                 const char *protoname;
 345
 346                 switch (address->addresstype)
 347                 {
 348                         case LHNETADDRESSTYPE_INET6:
 349                                 protoname = "ipv6";
 350                                 break;
 351                         case LHNETADDRESSTYPE_INET4:
 352                                 protoname = "ipv4";
 353                                 break;
 354                         default:
 355                                 protoname = "UNKNOWN";
 356                                 break;
 357                 }
 358                 LHNETADDRESS_ToString(vaddress, string2, sizeof(string2), 1);
 359                 Con_Printf("LHNETADDRESS_Resolve(\"%s\") returned %s address %s\n", string, protoname, string2);
 360 #endif
 361                 namecache[namecacheposition].address = *address;
 362         }
 363         else
 364         {
 365 #ifdef STANDALONETEST
 366                 printf("name resolution failed on address \"%s\"\n", name);
 367 #endif
 368                 namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 369         }
 370
 371         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 372         return resolved;
 373 }
 374 #else
 375 int LHNETADDRESS_FromString(lhnetaddress_t *vaddress, const char *string, int defaultport)
 376 {
 377         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 378         int i, port, namelen, d1, d2, d3, d4;
 379         struct hostent *hostentry;
 380         unsigned char *a;
 381         const char *colon;
 382         char name[128];
 383 #ifdef STANDALONETEST
 384         char string2[128];
 385 #endif
 386         if (!address || !string || !*string)
 387                 return 0;
 388         memset(address, 0, sizeof(*address));
 389         address->addresstype = LHNETADDRESSTYPE_NONE;
 390         port = 0;
 391         colon = strrchr(string, ':');
 392         if (colon && (colon == strchr(string, ':') || (string[0] == '[' && colon - string > 0 && colon[-1] == ']')))
 393         //           EITHER: colon is the ONLY colon  OR: colon comes after [...] delimited IPv6 address
 394         //           fixes misparsing of IPv6 addresses without port
 395         {
 396                 port = atoi(colon + 1);
 397         }
 398         else
 399                 colon = string + strlen(string);
 400         if (port == 0)
 401                 port = defaultport;
 402         namelen = colon - string;
 403         if (namelen > 127)
 404                 namelen = 127;
 405         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
 406         {
 407                 string++;
 408                 namelen -= 2;
 409         }
 410         memcpy(name, string, namelen);
 411         name[namelen] = 0;
 412         // handle loopback
 413         if (!strcmp(name, "local"))
 414         {
 415                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 416                 address->port = port;
 417                 return 1;
 418         }
 419         // try to parse as dotted decimal ipv4 address first
 420         // note this supports partial ip addresses
 421         d1 = d2 = d3 = d4 = 0;
 422 #if _MSC_VER >= 1400
 423 #define sscanf sscanf_s
 424 #endif
 425         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)
 426         {
 427                 // parsed a valid ipv4 address
 428                 address->addresstype = LHNETADDRESSTYPE_INET4;
 429                 address->port = port;
 430                 address->addr.in.sin_family = AF_INET;
 431                 address->addr.in.sin_port = htons((unsigned short)port);
 432                 a = (unsigned char *)&address->addr.in.sin_addr;
 433                 a[0] = d1;
 434                 a[1] = d2;
 435                 a[2] = d3;
 436                 a[3] = d4;
 437 #ifdef STANDALONETEST
 438                 LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 439                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
 440 #endif
 441                 return 1;
 442         }
 443         for (i = 0;i < MAX_NAMECACHE;i++)
 444                 if (!strcmp(namecache[i].name, name))
 445                         break;
 446 #ifdef STANDALONETEST
 447         if (i < MAX_NAMECACHE)
 448 #else
 449         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 450 #endif
 451         {
 452                 *address = namecache[i].address;
 453                 address->port = port;
 454                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 455                 {
 456 #ifdef SUPPORTIPV6
 457                         address->addr.in6.sin6_port = htons((unsigned short)port);
 458                         return 1;
 459 #endif
 460                 }
 461                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 462                 {
 463                         address->addr.in.sin_port = htons((unsigned short)port);
 464                         return 1;
 465                 }
 466                 return 0;
 467         }
 468         // try gethostbyname (handles dns and other ip formats)
 469         hostentry = gethostbyname(name);
 470         if (hostentry)
 471         {
 472                 if (hostentry->h_addrtype == AF_INET6)
 473                 {
 474 #ifdef SUPPORTIPV6
 475                         // great it worked
 476                         address->addresstype = LHNETADDRESSTYPE_INET6;
 477                         address->port = port;
 478                         address->addr.in6.sin6_family = hostentry->h_addrtype;
 479                         address->addr.in6.sin6_port = htons((unsigned short)port);
 480                         memcpy(&address->addr.in6.sin6_addr, hostentry->h_addr_list[0], sizeof(address->addr.in6.sin6_addr));
 481                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 482                                 namecache[namecacheposition].name[i] = name[i];
 483                         namecache[namecacheposition].name[i] = 0;
 484 #ifndef STANDALONETEST
 485                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 486 #endif
 487                         namecache[namecacheposition].address = *address;
 488                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 489 #ifdef STANDALONETEST
 490                         LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 491                         printf("gethostbyname(\"%s\") returned ipv6 address %s\n", string, string2);
 492 #endif
 493                         return 1;
 494 #endif
 495                 }
 496                 else if (hostentry->h_addrtype == AF_INET)
 497                 {
 498                         // great it worked
 499                         address->addresstype = LHNETADDRESSTYPE_INET4;
 500                         address->port = port;
 501                         address->addr.in.sin_family = hostentry->h_addrtype;
 502                         address->addr.in.sin_port = htons((unsigned short)port);
 503                         memcpy(&address->addr.in.sin_addr, hostentry->h_addr_list[0], sizeof(address->addr.in.sin_addr));
 504                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 505                                 namecache[namecacheposition].name[i] = name[i];
 506                         namecache[namecacheposition].name[i] = 0;
 507 #ifndef STANDALONETEST
 508                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 509 #endif
 510                         namecache[namecacheposition].address = *address;
 511                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 512 #ifdef STANDALONETEST
 513                         LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 514                         printf("gethostbyname(\"%s\") returned ipv4 address %s\n", string, string2);
 515 #endif
 516                         return 1;
 517                 }
 518         }
 519 #ifdef STANDALONETEST
 520         printf("gethostbyname failed on address \"%s\"\n", name);
 521 #endif
 522         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 523                 namecache[namecacheposition].name[i] = name[i];
 524         namecache[namecacheposition].name[i] = 0;
 525 #ifndef STANDALONETEST
 526         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 527 #endif
 528         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 529         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 530         return 0;
 531 }
 532 #endif
 533
 534 int LHNETADDRESS_ToString(const lhnetaddress_t *vaddress, char *string, int stringbuffersize, int includeport)
 535 {
 536         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 537         const unsigned char *a;
 538         *string = 0;
 539         if (!address || !string || stringbuffersize < 1)
 540                 return 0;
 541         switch(address->addresstype)
 542         {
 543         default:
 544                 break;
 545         case LHNETADDRESSTYPE_LOOP:
 546                 if (includeport)
 547                 {
 548                         if (stringbuffersize >= 12)
 549                         {
 550                                 dpsnprintf(string, stringbuffersize, "local:%d", address->port);
 551                                 return 1;
 552                         }
 553                 }
 554                 else
 555                 {
 556                         if (stringbuffersize >= 6)
 557                         {
 558                                 memcpy(string, "local", 6);
 559                                 return 1;
 560                         }
 561                 }
 562                 break;
 563         case LHNETADDRESSTYPE_INET4:
 564                 a = (const unsigned char *)(&address->addr.in.sin_addr);
 565                 if (includeport)
 566                 {
 567                         if (stringbuffersize >= 22)
 568                         {
 569                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d:%d", a[0], a[1], a[2], a[3], address->port);
 570                                 return 1;
 571                         }
 572                 }
 573                 else
 574                 {
 575                         if (stringbuffersize >= 16)
 576                         {
 577                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
 578                                 return 1;
 579                         }
 580                 }
 581                 break;
 582 #ifdef SUPPORTIPV6
 583         case LHNETADDRESSTYPE_INET6:
 584                 a = (const unsigned char *)(&address->addr.in6.sin6_addr);
 585                 if (includeport)
 586                 {
 587                         if (stringbuffersize >= 88)
 588                         {
 589                                 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);
 590                                 return 1;
 591                         }
 592                 }
 593                 else
 594                 {
 595                         if (stringbuffersize >= 80)
 596                         {
 597                                 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]);
 598                                 return 1;
 599                         }
 600                 }
 601                 break;
 602 #endif
 603         }
 604         return 0;
 605 }
 606
 607 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 608 {
 609         if (address)
 610                 return address->addresstype;
 611         else
 612                 return LHNETADDRESSTYPE_NONE;
 613 }
 614
 615 const char *LHNETADDRESS_GetInterfaceName(const lhnetaddress_t *vaddress)
 616 {
 617 #ifdef SUPPORTIPV6
 618         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 619
 620         if (address && address->addresstype == LHNETADDRESSTYPE_INET6)
 621         {
 622 #ifndef _WIN32
 623
 624                 static char ifname [IF_NAMESIZE];
 625
 626                 if (if_indextoname(address->addr.in6.sin6_scope_id, ifname) == ifname)
 627                         return ifname;
 628
 629 #else
 630
 631                 // The Win32 API doesn't have if_indextoname() until Windows Vista,
 632                 // but luckily it just uses the interface ID as the interface name
 633
 634                 static char ifname [16];
 635
 636                 if (dpsnprintf(ifname, sizeof(ifname), "%lu", address->addr.in6.sin6_scope_id) > 0)
 637                         return ifname;
 638
 639 #endif
 640         }
 641 #endif
 642
 643         return NULL;
 644 }
 645
 646 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 647 {
 648         if (!address)
 649                 return -1;
 650         return address->port;
 651 }
 652
 653 int LHNETADDRESS_SetPort(lhnetaddress_t *vaddress, int port)
 654 {
 655         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 656         if (!address)
 657                 return 0;
 658         address->port = port;
 659         switch(address->addresstype)
 660         {
 661         case LHNETADDRESSTYPE_LOOP:
 662                 return 1;
 663         case LHNETADDRESSTYPE_INET4:
 664                 address->addr.in.sin_port = htons((unsigned short)port);
 665                 return 1;
 666 #ifdef SUPPORTIPV6
 667         case LHNETADDRESSTYPE_INET6:
 668                 address->addr.in6.sin6_port = htons((unsigned short)port);
 669                 return 1;
 670 #endif
 671         default:
 672                 return 0;
 673         }
 674 }
 675
 676 int LHNETADDRESS_Compare(const lhnetaddress_t *vaddress1, const lhnetaddress_t *vaddress2)
 677 {
 678         lhnetaddressnative_t *address1 = (lhnetaddressnative_t *)vaddress1;
 679         lhnetaddressnative_t *address2 = (lhnetaddressnative_t *)vaddress2;
 680         if (!address1 || !address2)
 681                 return 1;
 682         if (address1->addresstype != address2->addresstype)
 683                 return 1;
 684         switch(address1->addresstype)
 685         {
 686         case LHNETADDRESSTYPE_LOOP:
 687                 if (address1->port != address2->port)
 688                         return -1;
 689                 return 0;
 690         case LHNETADDRESSTYPE_INET4:
 691                 if (address1->addr.in.sin_family != address2->addr.in.sin_family)
 692                         return 1;
 693                 if (memcmp(&address1->addr.in.sin_addr, &address2->addr.in.sin_addr, sizeof(address1->addr.in.sin_addr)))
 694                         return 1;
 695                 if (address1->port != address2->port)
 696                         return -1;
 697                 return 0;
 698 #ifdef SUPPORTIPV6
 699         case LHNETADDRESSTYPE_INET6:
 700                 if (address1->addr.in6.sin6_family != address2->addr.in6.sin6_family)
 701                         return 1;
 702                 if (memcmp(&address1->addr.in6.sin6_addr, &address2->addr.in6.sin6_addr, sizeof(address1->addr.in6.sin6_addr)))
 703                         return 1;
 704                 if (address1->port != address2->port)
 705                         return -1;
 706                 return 0;
 707 #endif
 708         default:
 709                 return 1;
 710         }
 711 }
 712
 713 typedef struct lhnetpacket_s
 714 {
 715         void *data;
 716         int length;
 717         int sourceport;
 718         int destinationport;
 719         time_t timeout;
 720 #ifndef STANDALONETEST
 721         double sentdoubletime;
 722 #endif
 723         struct lhnetpacket_s *next, *prev;
 724 }
 725 lhnetpacket_t;
 726
 727 static int lhnet_active;
 728 static lhnetsocket_t lhnet_socketlist;
 729 static lhnetpacket_t lhnet_packetlist;
 730 #ifdef WIN32
 731 static int lhnet_didWSAStartup = 0;
 732 static WSADATA lhnet_winsockdata;
 733 #endif
 734
 735 void LHNET_Init(void)
 736 {
 737         if (lhnet_active)
 738                 return;
 739         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 740         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 741         lhnet_active = 1;
 742 #ifdef WIN32
 743         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 744         if (!lhnet_didWSAStartup)
 745                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 746 #endif
 747 }
 748
 749 void LHNET_Shutdown(void)
 750 {
 751         lhnetpacket_t *p;
 752         if (!lhnet_active)
 753                 return;
 754         while (lhnet_socketlist.next != &lhnet_socketlist)
 755                 LHNET_CloseSocket(lhnet_socketlist.next);
 756         while (lhnet_packetlist.next != &lhnet_packetlist)
 757         {
 758                 p = lhnet_packetlist.next;
 759                 p->prev->next = p->next;
 760                 p->next->prev = p->prev;
 761                 Z_Free(p);
 762         }
 763 #ifdef WIN32
 764         if (lhnet_didWSAStartup)
 765         {
 766                 lhnet_didWSAStartup = 0;
 767                 WSACleanup();
 768         }
 769 #endif
 770         lhnet_active = 0;
 771 }
 772
 773 static const char *LHNETPRIVATE_StrError(void)
 774 {
 775 #ifdef WIN32
 776         int i = WSAGetLastError();
 777         switch (i)
 778         {
 779                 case WSAEINTR:           return "WSAEINTR";
 780                 case WSAEBADF:           return "WSAEBADF";
 781                 case WSAEACCES:          return "WSAEACCES";
 782                 case WSAEFAULT:          return "WSAEFAULT";
 783                 case WSAEINVAL:          return "WSAEINVAL";
 784                 case WSAEMFILE:          return "WSAEMFILE";
 785                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 786                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 787                 case WSAEALREADY:        return "WSAEALREADY";
 788                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 789                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 790                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 791                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 792                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 793                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 794                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 795                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 796                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 797                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 798                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 799                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 800                 case WSAENETDOWN:        return "WSAENETDOWN";
 801                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 802                 case WSAENETRESET:       return "WSAENETRESET";
 803                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 804                 case WSAECONNRESET:      return "WSAECONNRESET";
 805                 case WSAENOBUFS:         return "WSAENOBUFS";
 806                 case WSAEISCONN:         return "WSAEISCONN";
 807                 case WSAENOTCONN:        return "WSAENOTCONN";
 808                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 809                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 810                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 811                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 812                 case WSAELOOP:           return "WSAELOOP";
 813                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 814                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 815                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 816                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 817                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 818                 case WSAEUSERS:          return "WSAEUSERS";
 819                 case WSAEDQUOT:          return "WSAEDQUOT";
 820                 case WSAESTALE:          return "WSAESTALE";
 821                 case WSAEREMOTE:         return "WSAEREMOTE";
 822                 case WSAEDISCON:         return "WSAEDISCON";
 823                 case 0:                  return "no error";
 824                 default:                 return "unknown WSAE error";
 825         }
 826 #else
 827         return strerror(errno);
 828 #endif
 829 }
 830
 831 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 832 {
 833 #ifdef FD_SET
 834         fd_set fdreadset;
 835         struct timeval tv;
 836         int lastfd;
 837         lhnetsocket_t *s;
 838         FD_ZERO(&fdreadset);
 839         lastfd = 0;
 840         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 841         {
 842                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 843                 {
 844                         if (lastfd < s->inetsocket)
 845                                 lastfd = s->inetsocket;
 846 #if defined(WIN32) && !defined(_MSC_VER)
 847                         FD_SET((int)s->inetsocket, &fdreadset);
 848 #else
 849                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 850 #endif
 851                 }
 852         }
 853         tv.tv_sec = microseconds / 1000000;
 854         tv.tv_usec = microseconds % 1000000;
 855         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 856 #else
 857         Sys_Sleep(microseconds);
 858 #endif
 859 }
 860
 861 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 862 {
 863         lhnetsocket_t *lhnetsocket, *s;
 864         if (!address)
 865                 return NULL;
 866         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 867         if (lhnetsocket)
 868         {
 869                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 870                 lhnetsocket->address = *address;
 871                 switch(lhnetsocket->address.addresstype)
 872                 {
 873                 case LHNETADDRESSTYPE_LOOP:
 874                         if (lhnetsocket->address.port == 0)
 875                         {
 876                                 // allocate a port dynamically
 877                                 // this search will always terminate because there is never
 878                                 // an allocated socket with port 0, so if the number wraps it
 879                                 // will find the port is unused, and then refuse to use port
 880                                 // 0, causing an intentional failure condition
 881                                 lhnetsocket->address.port = 1024;
 882                                 for (;;)
 883                                 {
 884                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 885                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 886                                                         break;
 887                                         if (s == &lhnet_socketlist)
 888                                                 break;
 889                                         lhnetsocket->address.port++;
 890                                 }
 891                         }
 892                         // check if the port is available
 893                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 894                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 895                                         break;
 896                         if (s == &lhnet_socketlist && lhnetsocket->address.port != 0)
 897                         {
 898                                 lhnetsocket->next = &lhnet_socketlist;
 899                                 lhnetsocket->prev = lhnetsocket->next->prev;
 900                                 lhnetsocket->next->prev = lhnetsocket;
 901                                 lhnetsocket->prev->next = lhnetsocket;
 902                                 return lhnetsocket;
 903                         }
 904                         break;
 905                 case LHNETADDRESSTYPE_INET4:
 906 #ifdef SUPPORTIPV6
 907                 case LHNETADDRESSTYPE_INET6:
 908 #endif
 909 #ifdef WIN32
 910                         if (lhnet_didWSAStartup)
 911                         {
 912 #endif
 913 #ifdef SUPPORTIPV6
 914                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? PF_INET6 : PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 915 #else
 916                                 if ((lhnetsocket->inetsocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 917 #endif
 918                                 {
 919 #ifdef WIN32
 920                                         u_long _false = 0;
 921 #endif
 922 #ifdef MSG_DONTWAIT
 923                                         if (1)
 924 #else
 925 #ifdef WIN32
 926                                         u_long _true = 1;
 927 #else
 928                                         char _true = 1;
 929 #endif
 930                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 931 #endif
 932                                         {
 933 #ifdef IPV6_V6ONLY
 934                                                 // We need to set this flag to tell the OS that we only listen on IPv6. If we don't
 935                                                 // most OSes will create a dual-protocol socket that also listens on IPv4. In this case
 936                                                 // if an IPv4 socket is already bound to the port we want, our bind() call will fail.
 937                                                 int ipv6_only = 1;
 938                                                 if (address->addresstype != LHNETADDRESSTYPE_INET6
 939                                                         || setsockopt (lhnetsocket->inetsocket, IPPROTO_IPV6, IPV6_V6ONLY,
 940                                                                                    (const char *)&ipv6_only, sizeof(ipv6_only)) == 0
 941 #ifdef WIN32
 942                                                         // The Win32 API only supports IPV6_V6ONLY since Windows Vista, but fortunately
 943                                                         // the default value is what we want on Win32 anyway (IPV6_V6ONLY = true)
 944                                                         || SOCKETERRNO == WSAENOPROTOOPT
 945 #endif
 946                                                         )
 947 #endif
 948                                                 {
 949                                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 950                                                         SOCKLEN_T namelen;
 951                                                         int bindresult;
 952 #ifdef SUPPORTIPV6
 953                                                         if (address->addresstype == LHNETADDRESSTYPE_INET6)
 954                                                         {
 955                                                                 namelen = sizeof(localaddress->addr.in6);
 956                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 957                                                                 if (bindresult != -1)
 958                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 959                                                         }
 960                                                         else
 961 #endif
 962                                                         {
 963                                                                 namelen = sizeof(localaddress->addr.in);
 964                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 965                                                                 if (bindresult != -1)
 966                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 967                                                         }
 968                                                         if (bindresult != -1)
 969                                                         {
 970                                                                 int i = 1;
 971                                                                 // enable broadcast on this socket
 972                                                                 setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 973                                                                 lhnetsocket->next = &lhnet_socketlist;
 974                                                                 lhnetsocket->prev = lhnetsocket->next->prev;
 975                                                                 lhnetsocket->next->prev = lhnetsocket;
 976                                                                 lhnetsocket->prev->next = lhnetsocket;
 977 #ifdef WIN32
 978                                                                 if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 979                                                                         Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 980 #endif
 981                                                                 return lhnetsocket;
 982                                                         }
 983                                                         else
 984                                                                 Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 985                                                 }
 986 #ifdef IPV6_V6ONLY
 987                                                 else
 988                                                         Con_Printf("LHNET_OpenSocket_Connectionless: setsockopt(IPV6_V6ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
 989 #endif
 990                                         }
 991                                         else
 992                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 993                                         closesocket(lhnetsocket->inetsocket);
 994                                 }
 995                                 else
 996                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 997 #ifdef WIN32
 998                         }
 999                         else
1000                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
1001 #endif
1002                         break;
1003                 default:
1004                         break;
1005                 }
1006                 Z_Free(lhnetsocket);
1007         }
1008         return NULL;
1009 }
1010
1011 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
1012 {
1013         if (lhnetsocket)
1014         {
1015                 // unlink from socket list
1016                 if (lhnetsocket->next == NULL)
1017                         return; // invalid!
1018                 lhnetsocket->next->prev = lhnetsocket->prev;
1019                 lhnetsocket->prev->next = lhnetsocket->next;
1020                 lhnetsocket->next = NULL;
1021                 lhnetsocket->prev = NULL;
1022
1023                 // no special close code for loopback, just inet
1024                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1025                 {
1026                         closesocket(lhnetsocket->inetsocket);
1027                 }
1028                 Z_Free(lhnetsocket);
1029         }
1030 }
1031
1032 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
1033 {
1034         if (sock)
1035                 return &sock->address;
1036         else
1037                 return NULL;
1038 }
1039
1040 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *vaddress)
1041 {
1042         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
1043         int value = 0;
1044         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
1045                 return -1;
1046         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
1047         {
1048                 time_t currenttime;
1049                 lhnetpacket_t *p, *pnext;
1050                 // scan for any old packets to timeout while searching for a packet
1051                 // that is waiting to be delivered to this socket
1052                 currenttime = time(NULL);
1053                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
1054                 {
1055                         pnext = p->next;
1056                         if (p->timeout < currenttime)
1057                         {
1058                                 // unlink and free
1059                                 p->next->prev = p->prev;
1060                                 p->prev->next = p->next;
1061                                 Z_Free(p);
1062                                 continue;
1063                         }
1064 #ifndef STANDALONETEST
1065                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
1066                                 continue;
1067 #endif
1068                         if (value == 0 && p->destinationport == lhnetsocket->address.port)
1069                         {
1070                                 if (p->length <= maxcontentlength)
1071                                 {
1072                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
1073                                         *address = *localaddress;
1074                                         address->port = p->sourceport;
1075                                         memcpy(content, p->data, p->length);
1076                                         value = p->length;
1077                                 }
1078                                 else
1079                                         value = -1;
1080                                 // unlink and free
1081                                 p->next->prev = p->prev;
1082                                 p->prev->next = p->next;
1083                                 Z_Free(p);
1084                         }
1085                 }
1086         }
1087         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
1088         {
1089                 SOCKLEN_T inetaddresslength;
1090                 address->addresstype = LHNETADDRESSTYPE_NONE;
1091                 inetaddresslength = sizeof(address->addr.in);
1092                 value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
1093                 if (value > 0)
1094                 {
1095                         address->addresstype = LHNETADDRESSTYPE_INET4;
1096                         address->port = ntohs(address->addr.in.sin_port);
1097                         return value;
1098                 }
1099                 else if (value < 0)
1100                 {
1101                         int e = SOCKETERRNO;
1102                         if (e == EWOULDBLOCK)
1103                                 return 0;
1104                         switch (e)
1105                         {
1106                                 case ECONNREFUSED:
1107                                         Con_Print("Connection refused\n");
1108                                         return 0;
1109                         }
1110                         Con_DPrintf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
1111                 }
1112         }
1113 #ifdef SUPPORTIPV6
1114         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1115         {
1116                 SOCKLEN_T inetaddresslength;
1117                 address->addresstype = LHNETADDRESSTYPE_NONE;
1118                 inetaddresslength = sizeof(address->addr.in6);
1119                 value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
1120                 if (value > 0)
1121                 {
1122                         address->addresstype = LHNETADDRESSTYPE_INET6;
1123                         address->port = ntohs(address->addr.in6.sin6_port);
1124                         return value;
1125                 }
1126                 else if (value == -1)
1127                 {
1128                         int e = SOCKETERRNO;
1129                         if (e == EWOULDBLOCK)
1130                                 return 0;
1131                         switch (e)
1132                         {
1133                                 case ECONNREFUSED:
1134                                         Con_Print("Connection refused\n");
1135                                         return 0;
1136                         }
1137                         Con_DPrintf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
1138                 }
1139         }
1140 #endif
1141         return value;
1142 }
1143
1144 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *vaddress)
1145 {
1146         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
1147         int value = -1;
1148         if (!lhnetsocket || !address || !content || contentlength < 1)
1149                 return -1;
1150         if (lhnetsocket->address.addresstype != address->addresstype)
1151                 return -1;
1152         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
1153         {
1154                 lhnetpacket_t *p;
1155                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
1156                 p->data = (void *)(p + 1);
1157                 memcpy(p->data, content, contentlength);
1158                 p->length = contentlength;
1159                 p->sourceport = lhnetsocket->address.port;
1160                 p->destinationport = address->port;
1161                 p->timeout = time(NULL) + 10;
1162                 p->next = &lhnet_packetlist;
1163                 p->prev = p->next->prev;
1164                 p->next->prev = p;
1165                 p->prev->next = p;
1166 #ifndef STANDALONETEST
1167                 p->sentdoubletime = realtime;
1168 #endif
1169                 value = contentlength;
1170         }
1171         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
1172         {
1173                 value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, LHNET_SENDTO_FLAGS, (struct sockaddr *)&address->addr.in, sizeof(struct sockaddr_in));
1174                 if (value == -1)
1175                 {
1176                         if (SOCKETERRNO == EWOULDBLOCK)
1177                                 return 0;
1178                         Con_DPrintf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
1179                 }
1180         }
1181 #ifdef SUPPORTIPV6
1182         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1183         {
1184                 value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, 0, (struct sockaddr *)&address->addr.in6, sizeof(struct sockaddr_in6));
1185                 if (value == -1)
1186                 {
1187                         if (SOCKETERRNO == EWOULDBLOCK)
1188                                 return 0;
1189                         Con_DPrintf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
1190                 }
1191         }
1192 #endif
1193         return value;
1194 }
1195
1196 #ifdef STANDALONETEST
1197 int main(int argc, char **argv)
1198 {
1199 #if 1
1200         char *buffer = "test", buffer2[1024];
1201         int blen = strlen(buffer);
1202         int b2len = 1024;
1203         lhnetsocket_t *sock1;
1204         lhnetsocket_t *sock2;
1205         lhnetaddress_t myaddy1;
1206         lhnetaddress_t myaddy2;
1207         lhnetaddress_t myaddy3;
1208         lhnetaddress_t localhostaddy1;
1209         lhnetaddress_t localhostaddy2;
1210         int test1;
1211         int test2;
1212
1213         printf("calling LHNET_Init\n");
1214         LHNET_Init();
1215
1216         printf("calling LHNET_FromPort twice to create two local addresses\n");
1217         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
1218         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
1219         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
1220         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
1221
1222         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
1223         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
1224         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
1225
1226         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
1227         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
1228         printf("sleeping briefly\n");
1229 #ifdef WIN32
1230         Sleep (100);
1231 #else
1232         usleep (100000);
1233 #endif
1234         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
1235         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
1236         if (test2 > 0)
1237                 Con_Printf("socket to socket test succeeded\n");
1238         else
1239                 Con_Printf("socket to socket test failed\n");
1240
1241 #ifdef WIN32
1242         printf("press any key to exit\n");
1243         getchar();
1244 #endif
1245
1246         printf("calling LHNET_Shutdown\n");
1247         LHNET_Shutdown();
1248         printf("exiting\n");
1249         return 0;
1250 #else
1251         lhnetsocket_t *sock[16], *sendsock;
1252         int i;
1253         int numsockets;
1254         int count;
1255         int length;
1256         int port;
1257         time_t oldtime;
1258         time_t newtime;
1259         char *sendmessage;
1260         int sendmessagelength;
1261         lhnetaddress_t destaddress;
1262         lhnetaddress_t receiveaddress;
1263         lhnetaddress_t sockaddress[16];
1264         char buffer[1536], addressstring[128], addressstring2[128];
1265         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
1266         {
1267                 printf("calling LHNET_Init()\n");
1268                 LHNET_Init();
1269
1270                 numsockets = 0;
1271                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
1272                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
1273                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
1274
1275                 sendsock = NULL;
1276                 sendmessage = NULL;
1277                 sendmessagelength = 0;
1278
1279                 for (i = 0;i < numsockets;i++)
1280                 {
1281                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
1282                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
1283                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
1284                         {
1285                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1286                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
1287                         }
1288                         else
1289                         {
1290                                 printf("failed to open socket\n");
1291                                 if (i == 0)
1292                                 {
1293                                         LHNET_Shutdown();
1294                                         return -1;
1295                                 }
1296                         }
1297                 }
1298                 count = 0;
1299                 if (argc == 5)
1300                 {
1301                         count = atoi(argv[2]);
1302                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
1303                         {
1304                                 sendmessage = argv[4];
1305                                 sendmessagelength = strlen(sendmessage);
1306                                 sendsock = NULL;
1307                                 for (i = 0;i < numsockets;i++)
1308                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
1309                                                 sendsock = sock[i];
1310                                 if (sendsock == NULL)
1311                                 {
1312                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
1313                                         argc = 2;
1314                                 }
1315                         }
1316                         else
1317                         {
1318                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
1319                                 argc = 2;
1320                         }
1321                 }
1322                 printf("started, now listening for \"exit\" on the opened sockets\n");
1323                 oldtime = time(NULL);
1324                 for(;;)
1325                 {
1326 #ifdef WIN32
1327                         Sleep(1);
1328 #else
1329                         usleep(1);
1330 #endif
1331                         for (i = 0;i < numsockets;i++)
1332                         {
1333                                 if (sock[i])
1334                                 {
1335                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
1336                                         if (length < 0)
1337                                                 printf("localsock read error: length < 0");
1338                                         else if (length > 0 && length < (int)sizeof(buffer))
1339                                         {
1340                                                 buffer[length] = 0;
1341                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
1342                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1343                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
1344                                                 if (!strcmp(buffer, "exit"))
1345                                                         break;
1346                                         }
1347                                 }
1348                         }
1349                         if (i < numsockets)
1350                                 break;
1351                         if (argc == 5 && count > 0)
1352                         {
1353                                 newtime = time(NULL);
1354                                 if (newtime != oldtime)
1355                                 {
1356                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
1357                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
1358                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
1359                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
1360                                         if (length == sendmessagelength)
1361                                                 printf("sent successfully\n");
1362                                         else
1363                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
1364                                         oldtime = newtime;
1365                                         count--;
1366                                         if (count <= 0)
1367                                                 printf("Done sending, still listening for \"exit\"\n");
1368                                 }
1369                         }
1370                 }
1371                 for (i = 0;i < numsockets;i++)
1372                 {
1373                         if (sock[i])
1374                         {
1375                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1376                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
1377                                 LHNET_CloseSocket(sock[i]);
1378                         }
1379                 }
1380                 printf("calling LHNET_Shutdown()\n");
1381                 LHNET_Shutdown();
1382                 return 0;
1383         }
1384         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
1385         return -1;
1386 #endif
1387 }
1388 #endif
1389