lhnet.c

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