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 static 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, char *ifname, size_t ifnamelength)
 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                 if (if_indextoname(address->addr.in6.sin6_scope_id, ifname) == ifname)
 625                         return ifname;
 626
 627 #else
 628
 629                 // The Win32 API doesn't have if_indextoname() until Windows Vista,
 630                 // but luckily it just uses the interface ID as the interface name
 631
 632                 if (dpsnprintf(ifname, ifnamelength, "%lu", address->addr.in6.sin6_scope_id) > 0)
 633                         return ifname;
 634
 635 #endif
 636         }
 637 #endif
 638
 639         return NULL;
 640 }
 641
 642 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 643 {
 644         if (!address)
 645                 return -1;
 646         return address->port;
 647 }
 648
 649 int LHNETADDRESS_SetPort(lhnetaddress_t *vaddress, int port)
 650 {
 651         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 652         if (!address)
 653                 return 0;
 654         address->port = port;
 655         switch(address->addresstype)
 656         {
 657         case LHNETADDRESSTYPE_LOOP:
 658                 return 1;
 659         case LHNETADDRESSTYPE_INET4:
 660                 address->addr.in.sin_port = htons((unsigned short)port);
 661                 return 1;
 662 #ifdef SUPPORTIPV6
 663         case LHNETADDRESSTYPE_INET6:
 664                 address->addr.in6.sin6_port = htons((unsigned short)port);
 665                 return 1;
 666 #endif
 667         default:
 668                 return 0;
 669         }
 670 }
 671
 672 int LHNETADDRESS_Compare(const lhnetaddress_t *vaddress1, const lhnetaddress_t *vaddress2)
 673 {
 674         lhnetaddressnative_t *address1 = (lhnetaddressnative_t *)vaddress1;
 675         lhnetaddressnative_t *address2 = (lhnetaddressnative_t *)vaddress2;
 676         if (!address1 || !address2)
 677                 return 1;
 678         if (address1->addresstype != address2->addresstype)
 679                 return 1;
 680         switch(address1->addresstype)
 681         {
 682         case LHNETADDRESSTYPE_LOOP:
 683                 if (address1->port != address2->port)
 684                         return -1;
 685                 return 0;
 686         case LHNETADDRESSTYPE_INET4:
 687                 if (address1->addr.in.sin_family != address2->addr.in.sin_family)
 688                         return 1;
 689                 if (memcmp(&address1->addr.in.sin_addr, &address2->addr.in.sin_addr, sizeof(address1->addr.in.sin_addr)))
 690                         return 1;
 691                 if (address1->port != address2->port)
 692                         return -1;
 693                 return 0;
 694 #ifdef SUPPORTIPV6
 695         case LHNETADDRESSTYPE_INET6:
 696                 if (address1->addr.in6.sin6_family != address2->addr.in6.sin6_family)
 697                         return 1;
 698                 if (memcmp(&address1->addr.in6.sin6_addr, &address2->addr.in6.sin6_addr, sizeof(address1->addr.in6.sin6_addr)))
 699                         return 1;
 700                 if (address1->port != address2->port)
 701                         return -1;
 702                 return 0;
 703 #endif
 704         default:
 705                 return 1;
 706         }
 707 }
 708
 709 typedef struct lhnetpacket_s
 710 {
 711         void *data;
 712         int length;
 713         int sourceport;
 714         int destinationport;
 715         time_t timeout;
 716 #ifndef STANDALONETEST
 717         double sentdoubletime;
 718 #endif
 719         struct lhnetpacket_s *next, *prev;
 720 }
 721 lhnetpacket_t;
 722
 723 static int lhnet_active;
 724 static lhnetsocket_t lhnet_socketlist;
 725 static lhnetpacket_t lhnet_packetlist;
 726 #ifdef WIN32
 727 static int lhnet_didWSAStartup = 0;
 728 static WSADATA lhnet_winsockdata;
 729 #endif
 730
 731 void LHNET_Init(void)
 732 {
 733         if (lhnet_active)
 734                 return;
 735         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 736         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 737         lhnet_active = 1;
 738 #ifdef WIN32
 739         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 740         if (!lhnet_didWSAStartup)
 741                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 742 #endif
 743 }
 744
 745 void LHNET_Shutdown(void)
 746 {
 747         lhnetpacket_t *p;
 748         if (!lhnet_active)
 749                 return;
 750         while (lhnet_socketlist.next != &lhnet_socketlist)
 751                 LHNET_CloseSocket(lhnet_socketlist.next);
 752         while (lhnet_packetlist.next != &lhnet_packetlist)
 753         {
 754                 p = lhnet_packetlist.next;
 755                 p->prev->next = p->next;
 756                 p->next->prev = p->prev;
 757                 Z_Free(p);
 758         }
 759 #ifdef WIN32
 760         if (lhnet_didWSAStartup)
 761         {
 762                 lhnet_didWSAStartup = 0;
 763                 WSACleanup();
 764         }
 765 #endif
 766         lhnet_active = 0;
 767 }
 768
 769 static const char *LHNETPRIVATE_StrError(void)
 770 {
 771 #ifdef WIN32
 772         int i = WSAGetLastError();
 773         switch (i)
 774         {
 775                 case WSAEINTR:           return "WSAEINTR";
 776                 case WSAEBADF:           return "WSAEBADF";
 777                 case WSAEACCES:          return "WSAEACCES";
 778                 case WSAEFAULT:          return "WSAEFAULT";
 779                 case WSAEINVAL:          return "WSAEINVAL";
 780                 case WSAEMFILE:          return "WSAEMFILE";
 781                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 782                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 783                 case WSAEALREADY:        return "WSAEALREADY";
 784                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 785                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 786                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 787                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 788                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 789                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 790                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 791                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 792                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 793                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 794                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 795                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 796                 case WSAENETDOWN:        return "WSAENETDOWN";
 797                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 798                 case WSAENETRESET:       return "WSAENETRESET";
 799                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 800                 case WSAECONNRESET:      return "WSAECONNRESET";
 801                 case WSAENOBUFS:         return "WSAENOBUFS";
 802                 case WSAEISCONN:         return "WSAEISCONN";
 803                 case WSAENOTCONN:        return "WSAENOTCONN";
 804                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 805                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 806                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 807                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 808                 case WSAELOOP:           return "WSAELOOP";
 809                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 810                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 811                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 812                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 813                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 814                 case WSAEUSERS:          return "WSAEUSERS";
 815                 case WSAEDQUOT:          return "WSAEDQUOT";
 816                 case WSAESTALE:          return "WSAESTALE";
 817                 case WSAEREMOTE:         return "WSAEREMOTE";
 818                 case WSAEDISCON:         return "WSAEDISCON";
 819                 case 0:                  return "no error";
 820                 default:                 return "unknown WSAE error";
 821         }
 822 #else
 823         return strerror(errno);
 824 #endif
 825 }
 826
 827 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 828 {
 829 #ifdef FD_SET
 830         fd_set fdreadset;
 831         struct timeval tv;
 832         int lastfd;
 833         lhnetsocket_t *s;
 834         FD_ZERO(&fdreadset);
 835         lastfd = 0;
 836         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 837         {
 838                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 839                 {
 840                         if (lastfd < s->inetsocket)
 841                                 lastfd = s->inetsocket;
 842 #if defined(WIN32) && !defined(_MSC_VER)
 843                         FD_SET((int)s->inetsocket, &fdreadset);
 844 #else
 845                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 846 #endif
 847                 }
 848         }
 849         tv.tv_sec = microseconds / 1000000;
 850         tv.tv_usec = microseconds % 1000000;
 851         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 852 #else
 853         Sys_Sleep(microseconds);
 854 #endif
 855 }
 856
 857 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 858 {
 859         lhnetsocket_t *lhnetsocket, *s;
 860         if (!address)
 861                 return NULL;
 862         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 863         if (lhnetsocket)
 864         {
 865                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 866                 lhnetsocket->address = *address;
 867                 switch(lhnetsocket->address.addresstype)
 868                 {
 869                 case LHNETADDRESSTYPE_LOOP:
 870                         if (lhnetsocket->address.port == 0)
 871                         {
 872                                 // allocate a port dynamically
 873                                 // this search will always terminate because there is never
 874                                 // an allocated socket with port 0, so if the number wraps it
 875                                 // will find the port is unused, and then refuse to use port
 876                                 // 0, causing an intentional failure condition
 877                                 lhnetsocket->address.port = 1024;
 878                                 for (;;)
 879                                 {
 880                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 881                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 882                                                         break;
 883                                         if (s == &lhnet_socketlist)
 884                                                 break;
 885                                         lhnetsocket->address.port++;
 886                                 }
 887                         }
 888                         // check if the port is available
 889                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 890                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 891                                         break;
 892                         if (s == &lhnet_socketlist && lhnetsocket->address.port != 0)
 893                         {
 894                                 lhnetsocket->next = &lhnet_socketlist;
 895                                 lhnetsocket->prev = lhnetsocket->next->prev;
 896                                 lhnetsocket->next->prev = lhnetsocket;
 897                                 lhnetsocket->prev->next = lhnetsocket;
 898                                 return lhnetsocket;
 899                         }
 900                         break;
 901                 case LHNETADDRESSTYPE_INET4:
 902 #ifdef SUPPORTIPV6
 903                 case LHNETADDRESSTYPE_INET6:
 904 #endif
 905 #ifdef WIN32
 906                         if (lhnet_didWSAStartup)
 907                         {
 908 #endif
 909 #ifdef SUPPORTIPV6
 910                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? PF_INET6 : PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 911 #else
 912                                 if ((lhnetsocket->inetsocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 913 #endif
 914                                 {
 915 #ifdef WIN32
 916                                         u_long _false = 0;
 917 #endif
 918 #ifdef MSG_DONTWAIT
 919                                         if (1)
 920 #else
 921 #ifdef WIN32
 922                                         u_long _true = 1;
 923 #else
 924                                         char _true = 1;
 925 #endif
 926                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 927 #endif
 928                                         {
 929 #ifdef IPV6_V6ONLY
 930                                                 // We need to set this flag to tell the OS that we only listen on IPv6. If we don't
 931                                                 // most OSes will create a dual-protocol socket that also listens on IPv4. In this case
 932                                                 // if an IPv4 socket is already bound to the port we want, our bind() call will fail.
 933                                                 int ipv6_only = 1;
 934                                                 if (address->addresstype != LHNETADDRESSTYPE_INET6
 935                                                         || setsockopt (lhnetsocket->inetsocket, IPPROTO_IPV6, IPV6_V6ONLY,
 936                                                                                    (const char *)&ipv6_only, sizeof(ipv6_only)) == 0
 937 #ifdef WIN32
 938                                                         // The Win32 API only supports IPV6_V6ONLY since Windows Vista, but fortunately
 939                                                         // the default value is what we want on Win32 anyway (IPV6_V6ONLY = true)
 940                                                         || SOCKETERRNO == WSAENOPROTOOPT
 941 #endif
 942                                                         )
 943 #endif
 944                                                 {
 945                                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 946                                                         SOCKLEN_T namelen;
 947                                                         int bindresult;
 948
 949 #if defined(SOL_RFC1149) && defined(RFC1149_1149ONLY)
 950                                                         // we got reports of massive lags when this protocol was chosen as transport
 951                                                         // so better turn it off
 952                                                         {
 953                                                                 int rfc1149only = 0;
 954                                                                 int rfc1149enabled = 0;
 955                                                                 if(setsockopt(lhnetsocket->inetsocket, SOL_RFC1149, RFC1149_1149ONLY, &rfc1149only))
 956                                                                         Con_Printf("LHNET_OpenSocket_Connectionless: warning: setsockopt(RFC1149_1149ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
 957                                                                 if(setsockopt(lhnetsocket->inetsocket, SOL_RFC1149, RFC1149_ENABLED, &rfc1149enabled))
 958                                                                         Con_Printf("LHNET_OpenSocket_Connectionless: warning: setsockopt(RFC1149_ENABLED) returned error: %s\n", LHNETPRIVATE_StrError());
 959                                                         }
 960 #endif
 961
 962 #ifdef SUPPORTIPV6
 963                                                         if (address->addresstype == LHNETADDRESSTYPE_INET6)
 964                                                         {
 965                                                                 namelen = sizeof(localaddress->addr.in6);
 966                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 967                                                                 if (bindresult != -1)
 968                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 969                                                         }
 970                                                         else
 971 #endif
 972                                                         {
 973                                                                 namelen = sizeof(localaddress->addr.in);
 974                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 975                                                                 if (bindresult != -1)
 976                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 977                                                         }
 978                                                         if (bindresult != -1)
 979                                                         {
 980                                                                 int i = 1;
 981                                                                 // enable broadcast on this socket
 982                                                                 setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 983                                                                 lhnetsocket->next = &lhnet_socketlist;
 984                                                                 lhnetsocket->prev = lhnetsocket->next->prev;
 985                                                                 lhnetsocket->next->prev = lhnetsocket;
 986                                                                 lhnetsocket->prev->next = lhnetsocket;
 987 #ifdef WIN32
 988                                                                 if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 989                                                                         Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 990 #endif
 991                                                                 return lhnetsocket;
 992                                                         }
 993                                                         else
 994                                                                 Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 995                                                 }
 996 #ifdef IPV6_V6ONLY
 997                                                 else
 998                                                         Con_Printf("LHNET_OpenSocket_Connectionless: setsockopt(IPV6_V6ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
 999 #endif
1000                                         }
1001                                         else
1002                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
1003                                         closesocket(lhnetsocket->inetsocket);
1004                                 }
1005                                 else
1006                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
1007 #ifdef WIN32
1008                         }
1009                         else
1010                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
1011 #endif
1012                         break;
1013                 default:
1014                         break;
1015                 }
1016                 Z_Free(lhnetsocket);
1017         }
1018         return NULL;
1019 }
1020
1021 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
1022 {
1023         if (lhnetsocket)
1024         {
1025                 // unlink from socket list
1026                 if (lhnetsocket->next == NULL)
1027                         return; // invalid!
1028                 lhnetsocket->next->prev = lhnetsocket->prev;
1029                 lhnetsocket->prev->next = lhnetsocket->next;
1030                 lhnetsocket->next = NULL;
1031                 lhnetsocket->prev = NULL;
1032
1033                 // no special close code for loopback, just inet
1034                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1035                 {
1036                         closesocket(lhnetsocket->inetsocket);
1037                 }
1038                 Z_Free(lhnetsocket);
1039         }
1040 }
1041
1042 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
1043 {
1044         if (sock)
1045                 return &sock->address;
1046         else
1047                 return NULL;
1048 }
1049
1050 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *vaddress)
1051 {
1052         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
1053         int value = 0;
1054         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
1055                 return -1;
1056         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
1057         {
1058                 time_t currenttime;
1059                 lhnetpacket_t *p, *pnext;
1060                 // scan for any old packets to timeout while searching for a packet
1061                 // that is waiting to be delivered to this socket
1062                 currenttime = time(NULL);
1063                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
1064                 {
1065                         pnext = p->next;
1066                         if (p->timeout < currenttime)
1067                         {
1068                                 // unlink and free
1069                                 p->next->prev = p->prev;
1070                                 p->prev->next = p->next;
1071                                 Z_Free(p);
1072                                 continue;
1073                         }
1074 #ifndef STANDALONETEST
1075                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
1076                                 continue;
1077 #endif
1078                         if (value == 0 && p->destinationport == lhnetsocket->address.port)
1079                         {
1080                                 if (p->length <= maxcontentlength)
1081                                 {
1082                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
1083                                         *address = *localaddress;
1084                                         address->port = p->sourceport;
1085                                         memcpy(content, p->data, p->length);
1086                                         value = p->length;
1087                                 }
1088                                 else
1089                                         value = -1;
1090                                 // unlink and free
1091                                 p->next->prev = p->prev;
1092                                 p->prev->next = p->next;
1093                                 Z_Free(p);
1094                         }
1095                 }
1096         }
1097         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
1098         {
1099                 SOCKLEN_T inetaddresslength;
1100                 address->addresstype = LHNETADDRESSTYPE_NONE;
1101                 inetaddresslength = sizeof(address->addr.in);
1102                 value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
1103                 if (value > 0)
1104                 {
1105                         address->addresstype = LHNETADDRESSTYPE_INET4;
1106                         address->port = ntohs(address->addr.in.sin_port);
1107                         return value;
1108                 }
1109                 else if (value < 0)
1110                 {
1111                         int e = SOCKETERRNO;
1112                         if (e == EWOULDBLOCK)
1113                                 return 0;
1114                         switch (e)
1115                         {
1116                                 case ECONNREFUSED:
1117                                         Con_Print("Connection refused\n");
1118                                         return 0;
1119                         }
1120                         Con_DPrintf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
1121                 }
1122         }
1123 #ifdef SUPPORTIPV6
1124         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1125         {
1126                 SOCKLEN_T inetaddresslength;
1127                 address->addresstype = LHNETADDRESSTYPE_NONE;
1128                 inetaddresslength = sizeof(address->addr.in6);
1129                 value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
1130                 if (value > 0)
1131                 {
1132                         address->addresstype = LHNETADDRESSTYPE_INET6;
1133                         address->port = ntohs(address->addr.in6.sin6_port);
1134                         return value;
1135                 }
1136                 else if (value == -1)
1137                 {
1138                         int e = SOCKETERRNO;
1139                         if (e == EWOULDBLOCK)
1140                                 return 0;
1141                         switch (e)
1142                         {
1143                                 case ECONNREFUSED:
1144                                         Con_Print("Connection refused\n");
1145                                         return 0;
1146                         }
1147                         Con_DPrintf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
1148                 }
1149         }
1150 #endif
1151         return value;
1152 }
1153
1154 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *vaddress)
1155 {
1156         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
1157         int value = -1;
1158         if (!lhnetsocket || !address || !content || contentlength < 1)
1159                 return -1;
1160         if (lhnetsocket->address.addresstype != address->addresstype)
1161                 return -1;
1162         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
1163         {
1164                 lhnetpacket_t *p;
1165                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
1166                 p->data = (void *)(p + 1);
1167                 memcpy(p->data, content, contentlength);
1168                 p->length = contentlength;
1169                 p->sourceport = lhnetsocket->address.port;
1170                 p->destinationport = address->port;
1171                 p->timeout = time(NULL) + 10;
1172                 p->next = &lhnet_packetlist;
1173                 p->prev = p->next->prev;
1174                 p->next->prev = p;
1175                 p->prev->next = p;
1176 #ifndef STANDALONETEST
1177                 p->sentdoubletime = realtime;
1178 #endif
1179                 value = contentlength;
1180         }
1181         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
1182         {
1183                 value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, LHNET_SENDTO_FLAGS, (struct sockaddr *)&address->addr.in, sizeof(struct sockaddr_in));
1184                 if (value == -1)
1185                 {
1186                         if (SOCKETERRNO == EWOULDBLOCK)
1187                                 return 0;
1188                         Con_DPrintf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
1189                 }
1190         }
1191 #ifdef SUPPORTIPV6
1192         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1193         {
1194                 value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, 0, (struct sockaddr *)&address->addr.in6, sizeof(struct sockaddr_in6));
1195                 if (value == -1)
1196                 {
1197                         if (SOCKETERRNO == EWOULDBLOCK)
1198                                 return 0;
1199                         Con_DPrintf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
1200                 }
1201         }
1202 #endif
1203         return value;
1204 }
1205
1206 #ifdef STANDALONETEST
1207 int main(int argc, char **argv)
1208 {
1209 #if 1
1210         char *buffer = "test", buffer2[1024];
1211         int blen = strlen(buffer);
1212         int b2len = 1024;
1213         lhnetsocket_t *sock1;
1214         lhnetsocket_t *sock2;
1215         lhnetaddress_t myaddy1;
1216         lhnetaddress_t myaddy2;
1217         lhnetaddress_t myaddy3;
1218         lhnetaddress_t localhostaddy1;
1219         lhnetaddress_t localhostaddy2;
1220         int test1;
1221         int test2;
1222
1223         printf("calling LHNET_Init\n");
1224         LHNET_Init();
1225
1226         printf("calling LHNET_FromPort twice to create two local addresses\n");
1227         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
1228         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
1229         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
1230         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
1231
1232         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
1233         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
1234         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
1235
1236         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
1237         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
1238         printf("sleeping briefly\n");
1239 #ifdef WIN32
1240         Sleep (100);
1241 #else
1242         usleep (100000);
1243 #endif
1244         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
1245         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
1246         if (test2 > 0)
1247                 Con_Printf("socket to socket test succeeded\n");
1248         else
1249                 Con_Printf("socket to socket test failed\n");
1250
1251 #ifdef WIN32
1252         printf("press any key to exit\n");
1253         getchar();
1254 #endif
1255
1256         printf("calling LHNET_Shutdown\n");
1257         LHNET_Shutdown();
1258         printf("exiting\n");
1259         return 0;
1260 #else
1261         lhnetsocket_t *sock[16], *sendsock;
1262         int i;
1263         int numsockets;
1264         int count;
1265         int length;
1266         int port;
1267         time_t oldtime;
1268         time_t newtime;
1269         char *sendmessage;
1270         int sendmessagelength;
1271         lhnetaddress_t destaddress;
1272         lhnetaddress_t receiveaddress;
1273         lhnetaddress_t sockaddress[16];
1274         char buffer[1536], addressstring[128], addressstring2[128];
1275         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
1276         {
1277                 printf("calling LHNET_Init()\n");
1278                 LHNET_Init();
1279
1280                 numsockets = 0;
1281                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
1282                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
1283                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
1284
1285                 sendsock = NULL;
1286                 sendmessage = NULL;
1287                 sendmessagelength = 0;
1288
1289                 for (i = 0;i < numsockets;i++)
1290                 {
1291                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
1292                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
1293                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
1294                         {
1295                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1296                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
1297                         }
1298                         else
1299                         {
1300                                 printf("failed to open socket\n");
1301                                 if (i == 0)
1302                                 {
1303                                         LHNET_Shutdown();
1304                                         return -1;
1305                                 }
1306                         }
1307                 }
1308                 count = 0;
1309                 if (argc == 5)
1310                 {
1311                         count = atoi(argv[2]);
1312                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
1313                         {
1314                                 sendmessage = argv[4];
1315                                 sendmessagelength = strlen(sendmessage);
1316                                 sendsock = NULL;
1317                                 for (i = 0;i < numsockets;i++)
1318                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
1319                                                 sendsock = sock[i];
1320                                 if (sendsock == NULL)
1321                                 {
1322                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
1323                                         argc = 2;
1324                                 }
1325                         }
1326                         else
1327                         {
1328                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
1329                                 argc = 2;
1330                         }
1331                 }
1332                 printf("started, now listening for \"exit\" on the opened sockets\n");
1333                 oldtime = time(NULL);
1334                 for(;;)
1335                 {
1336 #ifdef WIN32
1337                         Sleep(1);
1338 #else
1339                         usleep(1);
1340 #endif
1341                         for (i = 0;i < numsockets;i++)
1342                         {
1343                                 if (sock[i])
1344                                 {
1345                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
1346                                         if (length < 0)
1347                                                 printf("localsock read error: length < 0");
1348                                         else if (length > 0 && length < (int)sizeof(buffer))
1349                                         {
1350                                                 buffer[length] = 0;
1351                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
1352                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1353                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
1354                                                 if (!strcmp(buffer, "exit"))
1355                                                         break;
1356                                         }
1357                                 }
1358                         }
1359                         if (i < numsockets)
1360                                 break;
1361                         if (argc == 5 && count > 0)
1362                         {
1363                                 newtime = time(NULL);
1364                                 if (newtime != oldtime)
1365                                 {
1366                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
1367                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
1368                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
1369                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
1370                                         if (length == sendmessagelength)
1371                                                 printf("sent successfully\n");
1372                                         else
1373                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
1374                                         oldtime = newtime;
1375                                         count--;
1376                                         if (count <= 0)
1377                                                 printf("Done sending, still listening for \"exit\"\n");
1378                                 }
1379                         }
1380                 }
1381                 for (i = 0;i < numsockets;i++)
1382                 {
1383                         if (sock[i])
1384                         {
1385                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1386                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
1387                                 LHNET_CloseSocket(sock[i]);
1388                         }
1389                 }
1390                 printf("calling LHNET_Shutdown()\n");
1391                 LHNET_Shutdown();
1392                 return 0;
1393         }
1394         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
1395         return -1;
1396 #endif
1397 }
1398 #endif
1399