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)
 390                 port = atoi(colon + 1);
 391         else
 392                 colon = string + strlen(string);
 393         if (port == 0)
 394                 port = defaultport;
 395         namelen = colon - string;
 396         if (namelen > 127)
 397                 namelen = 127;
 398         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
 399         {
 400                 string++;
 401                 namelen -= 2;
 402         }
 403         memcpy(name, string, namelen);
 404         name[namelen] = 0;
 405         // handle loopback
 406         if (!strcmp(name, "local"))
 407         {
 408                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 409                 address->port = port;
 410                 return 1;
 411         }
 412         // try to parse as dotted decimal ipv4 address first
 413         // note this supports partial ip addresses
 414         d1 = d2 = d3 = d4 = 0;
 415 #if _MSC_VER >= 1400
 416 #define sscanf sscanf_s
 417 #endif
 418         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)
 419         {
 420                 // parsed a valid ipv4 address
 421                 address->addresstype = LHNETADDRESSTYPE_INET4;
 422                 address->port = port;
 423                 address->addr.in.sin_family = AF_INET;
 424                 address->addr.in.sin_port = htons((unsigned short)port);
 425                 a = (unsigned char *)&address->addr.in.sin_addr;
 426                 a[0] = d1;
 427                 a[1] = d2;
 428                 a[2] = d3;
 429                 a[3] = d4;
 430 #ifdef STANDALONETEST
 431                 LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 432                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
 433 #endif
 434                 return 1;
 435         }
 436         for (i = 0;i < MAX_NAMECACHE;i++)
 437                 if (!strcmp(namecache[i].name, name))
 438                         break;
 439 #ifdef STANDALONETEST
 440         if (i < MAX_NAMECACHE)
 441 #else
 442         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 443 #endif
 444         {
 445                 *address = namecache[i].address;
 446                 address->port = port;
 447                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 448                 {
 449 #ifdef SUPPORTIPV6
 450                         address->addr.in6.sin6_port = htons((unsigned short)port);
 451                         return 1;
 452 #endif
 453                 }
 454                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 455                 {
 456                         address->addr.in.sin_port = htons((unsigned short)port);
 457                         return 1;
 458                 }
 459                 return 0;
 460         }
 461         // try gethostbyname (handles dns and other ip formats)
 462         hostentry = gethostbyname(name);
 463         if (hostentry)
 464         {
 465                 if (hostentry->h_addrtype == AF_INET6)
 466                 {
 467 #ifdef SUPPORTIPV6
 468                         // great it worked
 469                         address->addresstype = LHNETADDRESSTYPE_INET6;
 470                         address->port = port;
 471                         address->addr.in6.sin6_family = hostentry->h_addrtype;
 472                         address->addr.in6.sin6_port = htons((unsigned short)port);
 473                         memcpy(&address->addr.in6.sin6_addr, hostentry->h_addr_list[0], sizeof(address->addr.in6.sin6_addr));
 474                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 475                                 namecache[namecacheposition].name[i] = name[i];
 476                         namecache[namecacheposition].name[i] = 0;
 477 #ifndef STANDALONETEST
 478                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 479 #endif
 480                         namecache[namecacheposition].address = *address;
 481                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 482 #ifdef STANDALONETEST
 483                         LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 484                         printf("gethostbyname(\"%s\") returned ipv6 address %s\n", string, string2);
 485 #endif
 486                         return 1;
 487 #endif
 488                 }
 489                 else if (hostentry->h_addrtype == AF_INET)
 490                 {
 491                         // great it worked
 492                         address->addresstype = LHNETADDRESSTYPE_INET4;
 493                         address->port = port;
 494                         address->addr.in.sin_family = hostentry->h_addrtype;
 495                         address->addr.in.sin_port = htons((unsigned short)port);
 496                         memcpy(&address->addr.in.sin_addr, hostentry->h_addr_list[0], sizeof(address->addr.in.sin_addr));
 497                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 498                                 namecache[namecacheposition].name[i] = name[i];
 499                         namecache[namecacheposition].name[i] = 0;
 500 #ifndef STANDALONETEST
 501                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 502 #endif
 503                         namecache[namecacheposition].address = *address;
 504                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 505 #ifdef STANDALONETEST
 506                         LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 507                         printf("gethostbyname(\"%s\") returned ipv4 address %s\n", string, string2);
 508 #endif
 509                         return 1;
 510                 }
 511         }
 512 #ifdef STANDALONETEST
 513         printf("gethostbyname failed on address \"%s\"\n", name);
 514 #endif
 515         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 516                 namecache[namecacheposition].name[i] = name[i];
 517         namecache[namecacheposition].name[i] = 0;
 518 #ifndef STANDALONETEST
 519         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 520 #endif
 521         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 522         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 523         return 0;
 524 }
 525 #endif
 526
 527 int LHNETADDRESS_ToString(const lhnetaddress_t *vaddress, char *string, int stringbuffersize, int includeport)
 528 {
 529         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 530         const unsigned char *a;
 531         *string = 0;
 532         if (!address || !string || stringbuffersize < 1)
 533                 return 0;
 534         switch(address->addresstype)
 535         {
 536         default:
 537                 break;
 538         case LHNETADDRESSTYPE_LOOP:
 539                 if (includeport)
 540                 {
 541                         if (stringbuffersize >= 12)
 542                         {
 543                                 dpsnprintf(string, stringbuffersize, "local:%d", address->port);
 544                                 return 1;
 545                         }
 546                 }
 547                 else
 548                 {
 549                         if (stringbuffersize >= 6)
 550                         {
 551                                 memcpy(string, "local", 6);
 552                                 return 1;
 553                         }
 554                 }
 555                 break;
 556         case LHNETADDRESSTYPE_INET4:
 557                 a = (const unsigned char *)(&address->addr.in.sin_addr);
 558                 if (includeport)
 559                 {
 560                         if (stringbuffersize >= 22)
 561                         {
 562                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d:%d", a[0], a[1], a[2], a[3], address->port);
 563                                 return 1;
 564                         }
 565                 }
 566                 else
 567                 {
 568                         if (stringbuffersize >= 16)
 569                         {
 570                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
 571                                 return 1;
 572                         }
 573                 }
 574                 break;
 575 #ifdef SUPPORTIPV6
 576         case LHNETADDRESSTYPE_INET6:
 577                 a = (const unsigned char *)(&address->addr.in6.sin6_addr);
 578                 if (includeport)
 579                 {
 580                         if (stringbuffersize >= 88)
 581                         {
 582                                 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);
 583                                 return 1;
 584                         }
 585                 }
 586                 else
 587                 {
 588                         if (stringbuffersize >= 80)
 589                         {
 590                                 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]);
 591                                 return 1;
 592                         }
 593                 }
 594                 break;
 595 #endif
 596         }
 597         return 0;
 598 }
 599
 600 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 601 {
 602         if (address)
 603                 return address->addresstype;
 604         else
 605                 return LHNETADDRESSTYPE_NONE;
 606 }
 607
 608 const char *LHNETADDRESS_GetInterfaceName(const lhnetaddress_t *vaddress)
 609 {
 610 #ifdef SUPPORTIPV6
 611         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 612
 613         if (address && address->addresstype == LHNETADDRESSTYPE_INET6)
 614         {
 615 #ifndef _WIN32
 616
 617                 static char ifname [IF_NAMESIZE];
 618
 619                 if (if_indextoname(address->addr.in6.sin6_scope_id, ifname) == ifname)
 620                         return ifname;
 621
 622 #else
 623
 624                 // The Win32 API doesn't have if_indextoname() until Windows Vista,
 625                 // but luckily it just uses the interface ID as the interface name
 626
 627                 static char ifname [16];
 628
 629                 if (dpsnprintf(ifname, sizeof(ifname), "%lu", address->addr.in6.sin6_scope_id) > 0)
 630                         return ifname;
 631
 632 #endif
 633         }
 634 #endif
 635
 636         return NULL;
 637 }
 638
 639 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 640 {
 641         if (!address)
 642                 return -1;
 643         return address->port;
 644 }
 645
 646 int LHNETADDRESS_SetPort(lhnetaddress_t *vaddress, int port)
 647 {
 648         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 649         if (!address)
 650                 return 0;
 651         address->port = port;
 652         switch(address->addresstype)
 653         {
 654         case LHNETADDRESSTYPE_LOOP:
 655                 return 1;
 656         case LHNETADDRESSTYPE_INET4:
 657                 address->addr.in.sin_port = htons((unsigned short)port);
 658                 return 1;
 659 #ifdef SUPPORTIPV6
 660         case LHNETADDRESSTYPE_INET6:
 661                 address->addr.in6.sin6_port = htons((unsigned short)port);
 662                 return 1;
 663 #endif
 664         default:
 665                 return 0;
 666         }
 667 }
 668
 669 int LHNETADDRESS_Compare(const lhnetaddress_t *vaddress1, const lhnetaddress_t *vaddress2)
 670 {
 671         lhnetaddressnative_t *address1 = (lhnetaddressnative_t *)vaddress1;
 672         lhnetaddressnative_t *address2 = (lhnetaddressnative_t *)vaddress2;
 673         if (!address1 || !address2)
 674                 return 1;
 675         if (address1->addresstype != address2->addresstype)
 676                 return 1;
 677         switch(address1->addresstype)
 678         {
 679         case LHNETADDRESSTYPE_LOOP:
 680                 if (address1->port != address2->port)
 681                         return -1;
 682                 return 0;
 683         case LHNETADDRESSTYPE_INET4:
 684                 if (address1->addr.in.sin_family != address2->addr.in.sin_family)
 685                         return 1;
 686                 if (memcmp(&address1->addr.in.sin_addr, &address2->addr.in.sin_addr, sizeof(address1->addr.in.sin_addr)))
 687                         return 1;
 688                 if (address1->port != address2->port)
 689                         return -1;
 690                 return 0;
 691 #ifdef SUPPORTIPV6
 692         case LHNETADDRESSTYPE_INET6:
 693                 if (address1->addr.in6.sin6_family != address2->addr.in6.sin6_family)
 694                         return 1;
 695                 if (memcmp(&address1->addr.in6.sin6_addr, &address2->addr.in6.sin6_addr, sizeof(address1->addr.in6.sin6_addr)))
 696                         return 1;
 697                 if (address1->port != address2->port)
 698                         return -1;
 699                 return 0;
 700 #endif
 701         default:
 702                 return 1;
 703         }
 704 }
 705
 706 typedef struct lhnetpacket_s
 707 {
 708         void *data;
 709         int length;
 710         int sourceport;
 711         int destinationport;
 712         time_t timeout;
 713 #ifndef STANDALONETEST
 714         double sentdoubletime;
 715 #endif
 716         struct lhnetpacket_s *next, *prev;
 717 }
 718 lhnetpacket_t;
 719
 720 static int lhnet_active;
 721 static lhnetsocket_t lhnet_socketlist;
 722 static lhnetpacket_t lhnet_packetlist;
 723 #ifdef WIN32
 724 static int lhnet_didWSAStartup = 0;
 725 static WSADATA lhnet_winsockdata;
 726 #endif
 727
 728 void LHNET_Init(void)
 729 {
 730         if (lhnet_active)
 731                 return;
 732         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 733         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 734         lhnet_active = 1;
 735 #ifdef WIN32
 736         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 737         if (!lhnet_didWSAStartup)
 738                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 739 #endif
 740 }
 741
 742 void LHNET_Shutdown(void)
 743 {
 744         lhnetpacket_t *p;
 745         if (!lhnet_active)
 746                 return;
 747         while (lhnet_socketlist.next != &lhnet_socketlist)
 748                 LHNET_CloseSocket(lhnet_socketlist.next);
 749         while (lhnet_packetlist.next != &lhnet_packetlist)
 750         {
 751                 p = lhnet_packetlist.next;
 752                 p->prev->next = p->next;
 753                 p->next->prev = p->prev;
 754                 Z_Free(p);
 755         }
 756 #ifdef WIN32
 757         if (lhnet_didWSAStartup)
 758         {
 759                 lhnet_didWSAStartup = 0;
 760                 WSACleanup();
 761         }
 762 #endif
 763         lhnet_active = 0;
 764 }
 765
 766 static const char *LHNETPRIVATE_StrError(void)
 767 {
 768 #ifdef WIN32
 769         int i = WSAGetLastError();
 770         switch (i)
 771         {
 772                 case WSAEINTR:           return "WSAEINTR";
 773                 case WSAEBADF:           return "WSAEBADF";
 774                 case WSAEACCES:          return "WSAEACCES";
 775                 case WSAEFAULT:          return "WSAEFAULT";
 776                 case WSAEINVAL:          return "WSAEINVAL";
 777                 case WSAEMFILE:          return "WSAEMFILE";
 778                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 779                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 780                 case WSAEALREADY:        return "WSAEALREADY";
 781                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 782                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 783                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 784                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 785                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 786                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 787                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 788                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 789                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 790                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 791                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 792                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 793                 case WSAENETDOWN:        return "WSAENETDOWN";
 794                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 795                 case WSAENETRESET:       return "WSAENETRESET";
 796                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 797                 case WSAECONNRESET:      return "WSAECONNRESET";
 798                 case WSAENOBUFS:         return "WSAENOBUFS";
 799                 case WSAEISCONN:         return "WSAEISCONN";
 800                 case WSAENOTCONN:        return "WSAENOTCONN";
 801                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 802                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 803                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 804                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 805                 case WSAELOOP:           return "WSAELOOP";
 806                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 807                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 808                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 809                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 810                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 811                 case WSAEUSERS:          return "WSAEUSERS";
 812                 case WSAEDQUOT:          return "WSAEDQUOT";
 813                 case WSAESTALE:          return "WSAESTALE";
 814                 case WSAEREMOTE:         return "WSAEREMOTE";
 815                 case WSAEDISCON:         return "WSAEDISCON";
 816                 case 0:                  return "no error";
 817                 default:                 return "unknown WSAE error";
 818         }
 819 #else
 820         return strerror(errno);
 821 #endif
 822 }
 823
 824 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 825 {
 826 #ifdef FD_SET
 827         fd_set fdreadset;
 828         struct timeval tv;
 829         int lastfd;
 830         lhnetsocket_t *s;
 831         FD_ZERO(&fdreadset);
 832         lastfd = 0;
 833         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 834         {
 835                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 836                 {
 837                         if (lastfd < s->inetsocket)
 838                                 lastfd = s->inetsocket;
 839                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 840                 }
 841         }
 842         tv.tv_sec = microseconds / 1000000;
 843         tv.tv_usec = microseconds % 1000000;
 844         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 845 #else
 846         Sys_Sleep(microseconds);
 847 #endif
 848 }
 849
 850 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 851 {
 852         lhnetsocket_t *lhnetsocket, *s;
 853         if (!address)
 854                 return NULL;
 855         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 856         if (lhnetsocket)
 857         {
 858                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 859                 lhnetsocket->address = *address;
 860                 switch(lhnetsocket->address.addresstype)
 861                 {
 862                 case LHNETADDRESSTYPE_LOOP:
 863                         if (lhnetsocket->address.port == 0)
 864                         {
 865                                 // allocate a port dynamically
 866                                 // this search will always terminate because there is never
 867                                 // an allocated socket with port 0, so if the number wraps it
 868                                 // will find the port is unused, and then refuse to use port
 869                                 // 0, causing an intentional failure condition
 870                                 lhnetsocket->address.port = 1024;
 871                                 for (;;)
 872                                 {
 873                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 874                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 875                                                         break;
 876                                         if (s == &lhnet_socketlist)
 877                                                 break;
 878                                         lhnetsocket->address.port++;
 879                                 }
 880                         }
 881                         // check if the port is available
 882                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 883                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 884                                         break;
 885                         if (s == &lhnet_socketlist && lhnetsocket->address.port != 0)
 886                         {
 887                                 lhnetsocket->next = &lhnet_socketlist;
 888                                 lhnetsocket->prev = lhnetsocket->next->prev;
 889                                 lhnetsocket->next->prev = lhnetsocket;
 890                                 lhnetsocket->prev->next = lhnetsocket;
 891                                 return lhnetsocket;
 892                         }
 893                         break;
 894                 case LHNETADDRESSTYPE_INET4:
 895 #ifdef SUPPORTIPV6
 896                 case LHNETADDRESSTYPE_INET6:
 897 #endif
 898 #ifdef WIN32
 899                         if (lhnet_didWSAStartup)
 900                         {
 901 #endif
 902 #ifdef SUPPORTIPV6
 903                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? PF_INET6 : PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 904 #else
 905                                 if ((lhnetsocket->inetsocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 906 #endif
 907                                 {
 908 #ifdef WIN32
 909                                         u_long _false = 0;
 910 #endif
 911 #ifdef MSG_DONTWAIT
 912                                         if (1)
 913 #else
 914 #ifdef WIN32
 915                                         u_long _true = 1;
 916 #else
 917                                         char _true = 1;
 918 #endif
 919                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 920 #endif
 921                                         {
 922 #ifdef IPV6_V6ONLY
 923                                                 // We need to set this flag to tell the OS that we only listen on IPv6. If we don't
 924                                                 // most OSes will create a dual-protocol socket that also listens on IPv4. In this case
 925                                                 // if an IPv4 socket is already bound to the port we want, our bind() call will fail.
 926                                                 int ipv6_only = 1;
 927                                                 if (address->addresstype != LHNETADDRESSTYPE_INET6
 928                                                         || setsockopt (lhnetsocket->inetsocket, IPPROTO_IPV6, IPV6_V6ONLY,
 929                                                                                    (const char *)&ipv6_only, sizeof(ipv6_only)) == 0
 930 #ifdef WIN32
 931                                                         // The Win32 API only supports IPV6_V6ONLY since Windows Vista, but fortunately
 932                                                         // the default value is what we want on Win32 anyway (IPV6_V6ONLY = true)
 933                                                         || SOCKETERRNO == WSAENOPROTOOPT
 934 #endif
 935                                                         )
 936 #endif
 937                                                 {
 938                                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 939                                                         SOCKLEN_T namelen;
 940                                                         int bindresult;
 941 #ifdef SUPPORTIPV6
 942                                                         if (address->addresstype == LHNETADDRESSTYPE_INET6)
 943                                                         {
 944                                                                 namelen = sizeof(localaddress->addr.in6);
 945                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 946                                                                 if (bindresult != -1)
 947                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 948                                                         }
 949                                                         else
 950 #endif
 951                                                         {
 952                                                                 namelen = sizeof(localaddress->addr.in);
 953                                                                 bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 954                                                                 if (bindresult != -1)
 955                                                                         getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 956                                                         }
 957                                                         if (bindresult != -1)
 958                                                         {
 959                                                                 int i = 1;
 960                                                                 // enable broadcast on this socket
 961                                                                 setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 962                                                                 lhnetsocket->next = &lhnet_socketlist;
 963                                                                 lhnetsocket->prev = lhnetsocket->next->prev;
 964                                                                 lhnetsocket->next->prev = lhnetsocket;
 965                                                                 lhnetsocket->prev->next = lhnetsocket;
 966 #ifdef WIN32
 967                                                                 if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 968                                                                         Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 969 #endif
 970                                                                 return lhnetsocket;
 971                                                         }
 972                                                         else
 973                                                                 Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 974                                                 }
 975 #ifdef IPV6_V6ONLY
 976                                                 else
 977                                                         Con_Printf("LHNET_OpenSocket_Connectionless: setsockopt(IPV6_V6ONLY) returned error: %s\n", LHNETPRIVATE_StrError());
 978 #endif
 979                                         }
 980                                         else
 981                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 982                                         closesocket(lhnetsocket->inetsocket);
 983                                 }
 984                                 else
 985                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 986 #ifdef WIN32
 987                         }
 988                         else
 989                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 990 #endif
 991                         break;
 992                 default:
 993                         break;
 994                 }
 995                 Z_Free(lhnetsocket);
 996         }
 997         return NULL;
 998 }
 999
1000 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
1001 {
1002         if (lhnetsocket)
1003         {
1004                 // unlink from socket list
1005                 if (lhnetsocket->next == NULL)
1006                         return; // invalid!
1007                 lhnetsocket->next->prev = lhnetsocket->prev;
1008                 lhnetsocket->prev->next = lhnetsocket->next;
1009                 lhnetsocket->next = NULL;
1010                 lhnetsocket->prev = NULL;
1011
1012                 // no special close code for loopback, just inet
1013                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1014                 {
1015                         closesocket(lhnetsocket->inetsocket);
1016                 }
1017                 Z_Free(lhnetsocket);
1018         }
1019 }
1020
1021 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
1022 {
1023         if (sock)
1024                 return &sock->address;
1025         else
1026                 return NULL;
1027 }
1028
1029 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *vaddress)
1030 {
1031         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
1032         int value = 0;
1033         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
1034                 return -1;
1035         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
1036         {
1037                 time_t currenttime;
1038                 lhnetpacket_t *p, *pnext;
1039                 // scan for any old packets to timeout while searching for a packet
1040                 // that is waiting to be delivered to this socket
1041                 currenttime = time(NULL);
1042                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
1043                 {
1044                         pnext = p->next;
1045                         if (p->timeout < currenttime)
1046                         {
1047                                 // unlink and free
1048                                 p->next->prev = p->prev;
1049                                 p->prev->next = p->next;
1050                                 Z_Free(p);
1051                                 continue;
1052                         }
1053 #ifndef STANDALONETEST
1054                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
1055                                 continue;
1056 #endif
1057                         if (value == 0 && p->destinationport == lhnetsocket->address.port)
1058                         {
1059                                 if (p->length <= maxcontentlength)
1060                                 {
1061                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
1062                                         *address = *localaddress;
1063                                         address->port = p->sourceport;
1064                                         memcpy(content, p->data, p->length);
1065                                         value = p->length;
1066                                 }
1067                                 else
1068                                         value = -1;
1069                                 // unlink and free
1070                                 p->next->prev = p->prev;
1071                                 p->prev->next = p->next;
1072                                 Z_Free(p);
1073                         }
1074                 }
1075         }
1076         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
1077         {
1078                 SOCKLEN_T inetaddresslength;
1079                 address->addresstype = LHNETADDRESSTYPE_NONE;
1080                 inetaddresslength = sizeof(address->addr.in);
1081                 value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, LHNET_RECVFROM_FLAGS, &address->addr.sock, &inetaddresslength);
1082                 if (value > 0)
1083                 {
1084                         address->addresstype = LHNETADDRESSTYPE_INET4;
1085                         address->port = ntohs(address->addr.in.sin_port);
1086                         return value;
1087                 }
1088                 else if (value < 0)
1089                 {
1090                         int e = SOCKETERRNO;
1091                         if (e == EWOULDBLOCK)
1092                                 return 0;
1093                         switch (e)
1094                         {
1095                                 case ECONNREFUSED:
1096                                         Con_Print("Connection refused\n");
1097                                         return 0;
1098                         }
1099                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
1100                 }
1101         }
1102 #ifdef SUPPORTIPV6
1103         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1104         {
1105                 SOCKLEN_T inetaddresslength;
1106                 address->addresstype = LHNETADDRESSTYPE_NONE;
1107                 inetaddresslength = sizeof(address->addr.in6);
1108                 value = recvfrom(lhnetsocket->inetsocket, (char *)content, maxcontentlength, 0, &address->addr.sock, &inetaddresslength);
1109                 if (value > 0)
1110                 {
1111                         address->addresstype = LHNETADDRESSTYPE_INET6;
1112                         address->port = ntohs(address->addr.in6.sin6_port);
1113                         return value;
1114                 }
1115                 else if (value == -1)
1116                 {
1117                         int e = SOCKETERRNO;
1118                         if (e == EWOULDBLOCK)
1119                                 return 0;
1120                         switch (e)
1121                         {
1122                                 case ECONNREFUSED:
1123                                         Con_Print("Connection refused\n");
1124                                         return 0;
1125                         }
1126                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
1127                 }
1128         }
1129 #endif
1130         return value;
1131 }
1132
1133 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *vaddress)
1134 {
1135         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
1136         int value = -1;
1137         if (!lhnetsocket || !address || !content || contentlength < 1)
1138                 return -1;
1139         if (lhnetsocket->address.addresstype != address->addresstype)
1140                 return -1;
1141         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
1142         {
1143                 lhnetpacket_t *p;
1144                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
1145                 p->data = (void *)(p + 1);
1146                 memcpy(p->data, content, contentlength);
1147                 p->length = contentlength;
1148                 p->sourceport = lhnetsocket->address.port;
1149                 p->destinationport = address->port;
1150                 p->timeout = time(NULL) + 10;
1151                 p->next = &lhnet_packetlist;
1152                 p->prev = p->next->prev;
1153                 p->next->prev = p;
1154                 p->prev->next = p;
1155 #ifndef STANDALONETEST
1156                 p->sentdoubletime = realtime;
1157 #endif
1158                 value = contentlength;
1159         }
1160         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
1161         {
1162                 value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, LHNET_SENDTO_FLAGS, (struct sockaddr *)&address->addr.in, sizeof(struct sockaddr_in));
1163                 if (value == -1)
1164                 {
1165                         if (SOCKETERRNO == EWOULDBLOCK)
1166                                 return 0;
1167                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
1168                 }
1169         }
1170 #ifdef SUPPORTIPV6
1171         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
1172         {
1173                 value = sendto(lhnetsocket->inetsocket, (char *)content, contentlength, 0, (struct sockaddr *)&address->addr.in6, sizeof(struct sockaddr_in6));
1174                 if (value == -1)
1175                 {
1176                         if (SOCKETERRNO == EWOULDBLOCK)
1177                                 return 0;
1178                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
1179                 }
1180         }
1181 #endif
1182         return value;
1183 }
1184
1185 #ifdef STANDALONETEST
1186 int main(int argc, char **argv)
1187 {
1188 #if 1
1189         char *buffer = "test", buffer2[1024];
1190         int blen = strlen(buffer);
1191         int b2len = 1024;
1192         lhnetsocket_t *sock1;
1193         lhnetsocket_t *sock2;
1194         lhnetaddress_t myaddy1;
1195         lhnetaddress_t myaddy2;
1196         lhnetaddress_t myaddy3;
1197         lhnetaddress_t localhostaddy1;
1198         lhnetaddress_t localhostaddy2;
1199         int test1;
1200         int test2;
1201
1202         printf("calling LHNET_Init\n");
1203         LHNET_Init();
1204
1205         printf("calling LHNET_FromPort twice to create two local addresses\n");
1206         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
1207         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
1208         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
1209         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
1210
1211         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
1212         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
1213         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
1214
1215         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
1216         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
1217         printf("sleeping briefly\n");
1218 #ifdef WIN32
1219         Sleep (100);
1220 #else
1221         usleep (100000);
1222 #endif
1223         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
1224         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
1225         if (test2 > 0)
1226                 Con_Printf("socket to socket test succeeded\n");
1227         else
1228                 Con_Printf("socket to socket test failed\n");
1229
1230 #ifdef WIN32
1231         printf("press any key to exit\n");
1232         getchar();
1233 #endif
1234
1235         printf("calling LHNET_Shutdown\n");
1236         LHNET_Shutdown();
1237         printf("exiting\n");
1238         return 0;
1239 #else
1240         lhnetsocket_t *sock[16], *sendsock;
1241         int i;
1242         int numsockets;
1243         int count;
1244         int length;
1245         int port;
1246         time_t oldtime;
1247         time_t newtime;
1248         char *sendmessage;
1249         int sendmessagelength;
1250         lhnetaddress_t destaddress;
1251         lhnetaddress_t receiveaddress;
1252         lhnetaddress_t sockaddress[16];
1253         char buffer[1536], addressstring[128], addressstring2[128];
1254         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
1255         {
1256                 printf("calling LHNET_Init()\n");
1257                 LHNET_Init();
1258
1259                 numsockets = 0;
1260                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
1261                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
1262                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
1263
1264                 sendsock = NULL;
1265                 sendmessage = NULL;
1266                 sendmessagelength = 0;
1267
1268                 for (i = 0;i < numsockets;i++)
1269                 {
1270                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
1271                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
1272                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
1273                         {
1274                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1275                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
1276                         }
1277                         else
1278                         {
1279                                 printf("failed to open socket\n");
1280                                 if (i == 0)
1281                                 {
1282                                         LHNET_Shutdown();
1283                                         return -1;
1284                                 }
1285                         }
1286                 }
1287                 count = 0;
1288                 if (argc == 5)
1289                 {
1290                         count = atoi(argv[2]);
1291                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
1292                         {
1293                                 sendmessage = argv[4];
1294                                 sendmessagelength = strlen(sendmessage);
1295                                 sendsock = NULL;
1296                                 for (i = 0;i < numsockets;i++)
1297                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
1298                                                 sendsock = sock[i];
1299                                 if (sendsock == NULL)
1300                                 {
1301                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
1302                                         argc = 2;
1303                                 }
1304                         }
1305                         else
1306                         {
1307                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
1308                                 argc = 2;
1309                         }
1310                 }
1311                 printf("started, now listening for \"exit\" on the opened sockets\n");
1312                 oldtime = time(NULL);
1313                 for(;;)
1314                 {
1315 #ifdef WIN32
1316                         Sleep(1);
1317 #else
1318                         usleep(1);
1319 #endif
1320                         for (i = 0;i < numsockets;i++)
1321                         {
1322                                 if (sock[i])
1323                                 {
1324                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
1325                                         if (length < 0)
1326                                                 printf("localsock read error: length < 0");
1327                                         else if (length > 0 && length < (int)sizeof(buffer))
1328                                         {
1329                                                 buffer[length] = 0;
1330                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
1331                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1332                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
1333                                                 if (!strcmp(buffer, "exit"))
1334                                                         break;
1335                                         }
1336                                 }
1337                         }
1338                         if (i < numsockets)
1339                                 break;
1340                         if (argc == 5 && count > 0)
1341                         {
1342                                 newtime = time(NULL);
1343                                 if (newtime != oldtime)
1344                                 {
1345                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
1346                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
1347                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
1348                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
1349                                         if (length == sendmessagelength)
1350                                                 printf("sent successfully\n");
1351                                         else
1352                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
1353                                         oldtime = newtime;
1354                                         count--;
1355                                         if (count <= 0)
1356                                                 printf("Done sending, still listening for \"exit\"\n");
1357                                 }
1358                         }
1359                 }
1360                 for (i = 0;i < numsockets;i++)
1361                 {
1362                         if (sock[i])
1363                         {
1364                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1365                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
1366                                 LHNET_CloseSocket(sock[i]);
1367                         }
1368                 }
1369                 printf("calling LHNET_Shutdown()\n");
1370                 LHNET_Shutdown();
1371                 return 0;
1372         }
1373         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
1374         return -1;
1375 #endif
1376 }
1377 #endif
1378