lhnet.c

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