lhnet.c

   1
   2 // Written by Forest Hale 2003-06-15 and placed into public domain.
   3
   4 #ifndef STANDALONETEST
   5 #include "quakedef.h"
   6 #endif
   7
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <time.h>
  11 #include <string.h>
  12 #ifdef WIN32
  13 #include <winsock2.h>
  14 #include <ws2tcpip.h>
  15 #else
  16 #include <unistd.h>
  17 #include <sys/types.h>
  18 #include <sys/socket.h>
  19 #include <sys/ioctl.h>
  20 #include <errno.h>
  21 #include <netdb.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #endif
  25
  26 #ifdef __MORPHOS__
  27 #include <proto/socket.h>
  28 #endif
  29
  30 // for Z_Malloc/Z_Free in quake
  31 #ifndef STANDALONETEST
  32 #include "zone.h"
  33 #include "sys.h"
  34 #include "netconn.h"
  35 #else
  36 #define Con_Print printf
  37 #define Con_Printf printf
  38 #define Z_Malloc malloc
  39 #define Z_Free free
  40 #endif
  41
  42 #include "lhnet.h"
  43
  44 #if defined(WIN32)
  45 #define EWOULDBLOCK WSAEWOULDBLOCK
  46 #define ECONNREFUSED WSAECONNREFUSED
  47
  48 #define SOCKETERRNO WSAGetLastError()
  49
  50 #define IOC_VENDOR 0x18000000
  51 #define _WSAIOW(x,y) (IOC_IN|(x)|(y))
  52 #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
  53
  54 #define SOCKLEN_T int
  55 #elif defined(__MORPHOS__)
  56 #define ioctlsocket IoctlSocket
  57 #define closesocket CloseSocket
  58 #define SOCKETERRNO Errno()
  59
  60 #define SOCKLEN_T int
  61 #else
  62 #define ioctlsocket ioctl
  63 #define closesocket close
  64 #define SOCKETERRNO errno
  65
  66 #define SOCKLEN_T socklen_t
  67 #endif
  68
  69 typedef struct lhnetaddressnative_s
  70 {
  71         lhnetaddresstype_t addresstype;
  72         int port;
  73         union
  74         {
  75                 struct sockaddr sock;
  76                 struct sockaddr_in in;
  77                 struct sockaddr_in6 in6;
  78         }
  79         addr;
  80 }
  81 lhnetaddressnative_t;
  82
  83 // to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
  84 #define MAX_NAMECACHE 64
  85 static struct namecache_s
  86 {
  87         lhnetaddressnative_t address;
  88         double expirationtime;
  89         char name[64];
  90 }
  91 namecache[MAX_NAMECACHE];
  92 static int namecacheposition = 0;
  93
  94 int LHNETADDRESS_FromPort(lhnetaddress_t *vaddress, lhnetaddresstype_t addresstype, int port)
  95 {
  96         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
  97         if (!address)
  98                 return 0;
  99         switch(addresstype)
 100         {
 101         default:
 102                 return 0;
 103         case LHNETADDRESSTYPE_LOOP:
 104                 // local:port  (loopback)
 105                 memset(address, 0, sizeof(*address));
 106                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 107                 address->port = port;
 108                 return 1;
 109         case LHNETADDRESSTYPE_INET4:
 110                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
 111                 memset(address, 0, sizeof(*address));
 112                 address->addresstype = LHNETADDRESSTYPE_INET4;
 113                 address->port = port;
 114                 address->addr.in.sin_family = AF_INET;
 115                 address->addr.in.sin_port = htons((unsigned short)port);
 116                 return 1;
 117         case LHNETADDRESSTYPE_INET6:
 118                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
 119                 memset(address, 0, sizeof(*address));
 120                 address->addresstype = LHNETADDRESSTYPE_INET6;
 121                 address->port = port;
 122                 address->addr.in6.sin6_family = AF_INET6;
 123                 address->addr.in6.sin6_port = htons((unsigned short)port);
 124                 return 1;
 125         }
 126         return 0;
 127 }
 128
 129 int LHNETADDRESS_FromString(lhnetaddress_t *vaddress, const char *string, int defaultport)
 130 {
 131         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 132         int i, port, namelen, d1, d2, d3, d4;
 133         struct hostent *hostentry;
 134         unsigned char *a;
 135         const char *colon;
 136         char name[128];
 137 #ifdef STANDALONETEST
 138         char string2[128];
 139 #endif
 140         if (!address || !string || !*string)
 141                 return 0;
 142         memset(address, 0, sizeof(*address));
 143         address->addresstype = LHNETADDRESSTYPE_NONE;
 144         port = 0;
 145         colon = strrchr(string, ':');
 146         if (colon)
 147                 port = atoi(colon + 1);
 148         else
 149                 colon = string + strlen(string);
 150         if (port == 0)
 151                 port = defaultport;
 152         namelen = colon - string;
 153         if (namelen > 127)
 154                 namelen = 127;
 155         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
 156         {
 157                 string++;
 158                 namelen -= 2;
 159         }
 160         memcpy(name, string, namelen);
 161         name[namelen] = 0;
 162         // handle loopback
 163         if (!strcmp(name, "local"))
 164         {
 165                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 166                 address->port = port;
 167                 return 1;
 168         }
 169         // try to parse as dotted decimal ipv4 address first
 170         // note this supports partial ip addresses
 171         d1 = d2 = d3 = d4 = 0;
 172 #if _MSC_VER >= 1400
 173 #define sscanf sscanf_s
 174 #endif
 175         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)
 176         {
 177                 // parsed a valid ipv4 address
 178                 address->addresstype = LHNETADDRESSTYPE_INET4;
 179                 address->port = port;
 180                 address->addr.in.sin_family = AF_INET;
 181                 address->addr.in.sin_port = htons((unsigned short)port);
 182                 a = (unsigned char *)&address->addr.in.sin_addr;
 183                 a[0] = d1;
 184                 a[1] = d2;
 185                 a[2] = d3;
 186                 a[3] = d4;
 187 #ifdef STANDALONETEST
 188                 LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 189                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %s\n", string, string2);
 190 #endif
 191                 return 1;
 192         }
 193         for (i = 0;i < MAX_NAMECACHE;i++)
 194                 if (!strcmp(namecache[i].name, name))
 195                         break;
 196 #ifdef STANDALONETEST
 197         if (i < MAX_NAMECACHE)
 198 #else
 199         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 200 #endif
 201         {
 202                 *address = namecache[i].address;
 203                 address->port = port;
 204                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 205                 {
 206                         address->addr.in6.sin6_port = htons((unsigned short)port);
 207                         return 1;
 208                 }
 209                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 210                 {
 211                         address->addr.in.sin_port = htons((unsigned short)port);
 212                         return 1;
 213                 }
 214                 return 0;
 215         }
 216         // try gethostbyname (handles dns and other ip formats)
 217         hostentry = gethostbyname(name);
 218         if (hostentry)
 219         {
 220                 if (hostentry->h_addrtype == AF_INET6)
 221                 {
 222                         // great it worked
 223                         address->addresstype = LHNETADDRESSTYPE_INET6;
 224                         address->port = port;
 225                         address->addr.in6.sin6_family = hostentry->h_addrtype;
 226                         address->addr.in6.sin6_port = htons((unsigned short)port);
 227                         memcpy(&address->addr.in6.sin6_addr, hostentry->h_addr_list[0], sizeof(address->addr.in6.sin6_addr));
 228                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 229                                 namecache[namecacheposition].name[i] = name[i];
 230                         namecache[namecacheposition].name[i] = 0;
 231 #ifndef STANDALONETEST
 232                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 233 #endif
 234                         namecache[namecacheposition].address = *address;
 235                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 236 #ifdef STANDALONETEST
 237                         LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 238                         printf("gethostbyname(\"%s\") returned ipv6 address %s\n", string, string2);
 239 #endif
 240                         return 1;
 241                 }
 242                 else if (hostentry->h_addrtype == AF_INET)
 243                 {
 244                         // great it worked
 245                         address->addresstype = LHNETADDRESSTYPE_INET4;
 246                         address->port = port;
 247                         address->addr.in.sin_family = hostentry->h_addrtype;
 248                         address->addr.in.sin_port = htons((unsigned short)port);
 249                         memcpy(&address->addr.in.sin_addr, hostentry->h_addr_list[0], sizeof(address->addr.in.sin_addr));
 250                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 251                                 namecache[namecacheposition].name[i] = name[i];
 252                         namecache[namecacheposition].name[i] = 0;
 253 #ifndef STANDALONETEST
 254                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 255 #endif
 256                         namecache[namecacheposition].address = *address;
 257                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 258 #ifdef STANDALONETEST
 259                         LHNETADDRESS_ToString(address, string2, sizeof(string2), 1);
 260                         printf("gethostbyname(\"%s\") returned ipv4 address %s\n", string, string2);
 261 #endif
 262                         return 1;
 263                 }
 264         }
 265 #ifdef STANDALONETEST
 266         printf("gethostbyname failed on address \"%s\"\n", name);
 267 #endif
 268         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 269                 namecache[namecacheposition].name[i] = name[i];
 270         namecache[namecacheposition].name[i] = 0;
 271 #ifndef STANDALONETEST
 272         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 273 #endif
 274         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 275         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 276         return 0;
 277 }
 278
 279 int LHNETADDRESS_ToString(const lhnetaddress_t *vaddress, char *string, int stringbuffersize, int includeport)
 280 {
 281         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 282         const unsigned char *a;
 283         *string = 0;
 284         if (!address || !string || stringbuffersize < 1)
 285                 return 0;
 286         switch(address->addresstype)
 287         {
 288         default:
 289                 break;
 290         case LHNETADDRESSTYPE_LOOP:
 291                 if (includeport)
 292                 {
 293                         if (stringbuffersize >= 12)
 294                         {
 295                                 dpsnprintf(string, stringbuffersize, "local:%d", address->port);
 296                                 return 1;
 297                         }
 298                 }
 299                 else
 300                 {
 301                         if (stringbuffersize >= 6)
 302                         {
 303                                 memcpy(string, "local", 6);
 304                                 return 1;
 305                         }
 306                 }
 307                 break;
 308         case LHNETADDRESSTYPE_INET4:
 309                 a = (const unsigned char *)(&address->addr.in.sin_addr);
 310                 if (includeport)
 311                 {
 312                         if (stringbuffersize >= 22)
 313                         {
 314                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d:%d", a[0], a[1], a[2], a[3], address->port);
 315                                 return 1;
 316                         }
 317                 }
 318                 else
 319                 {
 320                         if (stringbuffersize >= 16)
 321                         {
 322                                 dpsnprintf(string, stringbuffersize, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
 323                                 return 1;
 324                         }
 325                 }
 326                 break;
 327         case LHNETADDRESSTYPE_INET6:
 328                 a = (const unsigned char *)(&address->addr.in6.sin6_addr);
 329                 if (includeport)
 330                 {
 331                         if (stringbuffersize >= 88)
 332                         {
 333                                 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);
 334                                 return 1;
 335                         }
 336                 }
 337                 else
 338                 {
 339                         if (stringbuffersize >= 80)
 340                         {
 341                                 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]);
 342                                 return 1;
 343                         }
 344                 }
 345                 break;
 346         }
 347         return 0;
 348 }
 349
 350 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 351 {
 352         if (address)
 353                 return address->addresstype;
 354         else
 355                 return LHNETADDRESSTYPE_NONE;
 356 }
 357
 358 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 359 {
 360         if (!address)
 361                 return -1;
 362         return address->port;
 363 }
 364
 365 int LHNETADDRESS_SetPort(lhnetaddress_t *vaddress, int port)
 366 {
 367         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 368         if (!address)
 369                 return 0;
 370         address->port = port;
 371         switch(address->addresstype)
 372         {
 373         case LHNETADDRESSTYPE_LOOP:
 374                 return 1;
 375         case LHNETADDRESSTYPE_INET4:
 376                 address->addr.in.sin_port = htons((unsigned short)port);
 377                 return 1;
 378         case LHNETADDRESSTYPE_INET6:
 379                 address->addr.in6.sin6_port = htons((unsigned short)port);
 380                 return 1;
 381         default:
 382                 return 0;
 383         }
 384 }
 385
 386 int LHNETADDRESS_Compare(const lhnetaddress_t *vaddress1, const lhnetaddress_t *vaddress2)
 387 {
 388         lhnetaddressnative_t *address1 = (lhnetaddressnative_t *)vaddress1;
 389         lhnetaddressnative_t *address2 = (lhnetaddressnative_t *)vaddress2;
 390         if (!address1 || !address2)
 391                 return 1;
 392         if (address1->addresstype != address2->addresstype)
 393                 return 1;
 394         switch(address1->addresstype)
 395         {
 396         case LHNETADDRESSTYPE_LOOP:
 397                 if (address1->port != address2->port)
 398                         return -1;
 399                 return 0;
 400         case LHNETADDRESSTYPE_INET4:
 401                 if (address1->addr.in.sin_family != address2->addr.in.sin_family)
 402                         return 1;
 403                 if (memcmp(&address1->addr.in.sin_addr, &address2->addr.in.sin_addr, sizeof(address1->addr.in.sin_addr)))
 404                         return 1;
 405                 if (address1->port != address2->port)
 406                         return -1;
 407                 return 0;
 408         case LHNETADDRESSTYPE_INET6:
 409                 if (address1->addr.in6.sin6_family != address2->addr.in6.sin6_family)
 410                         return 1;
 411                 if (memcmp(&address1->addr.in6.sin6_addr, &address2->addr.in6.sin6_addr, sizeof(address1->addr.in6.sin6_addr)))
 412                         return 1;
 413                 if (address1->port != address2->port)
 414                         return -1;
 415                 return 0;
 416         default:
 417                 return 1;
 418         }
 419 }
 420
 421 typedef struct lhnetpacket_s
 422 {
 423         void *data;
 424         int length;
 425         int sourceport;
 426         int destinationport;
 427         time_t timeout;
 428 #ifndef STANDALONETEST
 429         double sentdoubletime;
 430 #endif
 431         struct lhnetpacket_s *next, *prev;
 432 }
 433 lhnetpacket_t;
 434
 435 static int lhnet_active;
 436 static lhnetsocket_t lhnet_socketlist;
 437 static lhnetpacket_t lhnet_packetlist;
 438 #ifdef WIN32
 439 static int lhnet_didWSAStartup = 0;
 440 static WSADATA lhnet_winsockdata;
 441 #endif
 442
 443 void LHNET_Init(void)
 444 {
 445         if (lhnet_active)
 446                 return;
 447         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 448         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 449         lhnet_active = 1;
 450 #ifdef WIN32
 451         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 452         if (!lhnet_didWSAStartup)
 453                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 454 #endif
 455 }
 456
 457 void LHNET_Shutdown(void)
 458 {
 459         lhnetpacket_t *p;
 460         if (!lhnet_active)
 461                 return;
 462         while (lhnet_socketlist.next != &lhnet_socketlist)
 463                 LHNET_CloseSocket(lhnet_socketlist.next);
 464         while (lhnet_packetlist.next != &lhnet_packetlist)
 465         {
 466                 p = lhnet_packetlist.next;
 467                 p->prev->next = p->next;
 468                 p->next->prev = p->prev;
 469                 Z_Free(p);
 470         }
 471 #ifdef WIN32
 472         if (lhnet_didWSAStartup)
 473         {
 474                 lhnet_didWSAStartup = 0;
 475                 WSACleanup();
 476         }
 477 #endif
 478         lhnet_active = 0;
 479 }
 480
 481 static const char *LHNETPRIVATE_StrError(void)
 482 {
 483 #ifdef WIN32
 484         int i = WSAGetLastError();
 485         switch (i)
 486         {
 487                 case WSAEINTR:           return "WSAEINTR";
 488                 case WSAEBADF:           return "WSAEBADF";
 489                 case WSAEACCES:          return "WSAEACCES";
 490                 case WSAEFAULT:          return "WSAEFAULT";
 491                 case WSAEINVAL:          return "WSAEINVAL";
 492                 case WSAEMFILE:          return "WSAEMFILE";
 493                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 494                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 495                 case WSAEALREADY:        return "WSAEALREADY";
 496                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 497                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 498                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 499                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 500                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 501                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 502                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 503                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 504                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 505                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 506                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 507                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 508                 case WSAENETDOWN:        return "WSAENETDOWN";
 509                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 510                 case WSAENETRESET:       return "WSAENETRESET";
 511                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 512                 case WSAECONNRESET:      return "WSAECONNRESET";
 513                 case WSAENOBUFS:         return "WSAENOBUFS";
 514                 case WSAEISCONN:         return "WSAEISCONN";
 515                 case WSAENOTCONN:        return "WSAENOTCONN";
 516                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 517                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 518                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 519                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 520                 case WSAELOOP:           return "WSAELOOP";
 521                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 522                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 523                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 524                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 525                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 526                 case WSAEUSERS:          return "WSAEUSERS";
 527                 case WSAEDQUOT:          return "WSAEDQUOT";
 528                 case WSAESTALE:          return "WSAESTALE";
 529                 case WSAEREMOTE:         return "WSAEREMOTE";
 530                 case WSAEDISCON:         return "WSAEDISCON";
 531                 case 0:                  return "no error";
 532                 default:                 return "unknown WSAE error";
 533         }
 534 #else
 535         return strerror(errno);
 536 #endif
 537 }
 538
 539 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 540 {
 541         fd_set fdreadset;
 542         struct timeval tv;
 543         int lastfd;
 544         lhnetsocket_t *s;
 545         FD_ZERO(&fdreadset);
 546         lastfd = 0;
 547         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 548         {
 549                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 550                 {
 551                         if (lastfd < s->inetsocket)
 552                                 lastfd = s->inetsocket;
 553                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 554                 }
 555         }
 556         tv.tv_sec = microseconds / 1000000;
 557         tv.tv_usec = microseconds % 1000000;
 558         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 559 }
 560
 561 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 562 {
 563         lhnetsocket_t *lhnetsocket, *s;
 564         if (!address)
 565                 return NULL;
 566         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 567         if (lhnetsocket)
 568         {
 569                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 570                 lhnetsocket->address = *address;
 571                 switch(lhnetsocket->address.addresstype)
 572                 {
 573                 case LHNETADDRESSTYPE_LOOP:
 574                         if (lhnetsocket->address.port == 0)
 575                         {
 576                                 // allocate a port dynamically
 577                                 // this search will always terminate because there is never
 578                                 // an allocated socket with port 0, so if the number wraps it
 579                                 // will find the port is unused, and then refuse to use port
 580                                 // 0, causing an intentional failure condition
 581                                 lhnetsocket->address.port = 1024;
 582                                 for (;;)
 583                                 {
 584                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 585                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 586                                                         break;
 587                                         if (s == &lhnet_socketlist)
 588                                                 break;
 589                                         lhnetsocket->address.port++;
 590                                 }
 591                         }
 592                         // check if the port is available
 593                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 594                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.port == lhnetsocket->address.port)
 595                                         break;
 596                         if (s == &lhnet_socketlist && lhnetsocket->address.port != 0)
 597                         {
 598                                 lhnetsocket->next = &lhnet_socketlist;
 599                                 lhnetsocket->prev = lhnetsocket->next->prev;
 600                                 lhnetsocket->next->prev = lhnetsocket;
 601                                 lhnetsocket->prev->next = lhnetsocket;
 602                                 return lhnetsocket;
 603                         }
 604                         break;
 605                 case LHNETADDRESSTYPE_INET4:
 606                 case LHNETADDRESSTYPE_INET6:
 607 #ifdef WIN32
 608                         if (lhnet_didWSAStartup)
 609                         {
 610 #endif
 611                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? PF_INET6 : PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 612                                 {
 613 #ifdef WIN32
 614                                         u_long _true = 1;
 615                                         u_long _false = 0;
 616 #else
 617                                         char _true = 1;
 618 #endif
 619                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 620                                         {
 621                                                 lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 622                                                 SOCKLEN_T namelen;
 623                                                 int bindresult;
 624                                                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 625                                                 {
 626                                                         namelen = sizeof(localaddress->addr.in6);
 627                                                         bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 628                                                         if (bindresult != -1)
 629                                                                 getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 630                                                 }
 631                                                 else
 632                                                 {
 633                                                         namelen = sizeof(localaddress->addr.in);
 634                                                         bindresult = bind(lhnetsocket->inetsocket, &localaddress->addr.sock, namelen);
 635                                                         if (bindresult != -1)
 636                                                                 getsockname(lhnetsocket->inetsocket, &localaddress->addr.sock, &namelen);
 637                                                 }
 638                                                 if (bindresult != -1)
 639                                                 {
 640                                                         int i = 1;
 641                                                         // enable broadcast on this socket
 642                                                         setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 643                                                         lhnetsocket->next = &lhnet_socketlist;
 644                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 645                                                         lhnetsocket->next->prev = lhnetsocket;
 646                                                         lhnetsocket->prev->next = lhnetsocket;
 647 #ifdef WIN32
 648                                                         if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 649                                                                 Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 650 #endif
 651                                                         return lhnetsocket;
 652                                                 }
 653                                                 else
 654                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 655                                         }
 656                                         else
 657                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 658                                         closesocket(lhnetsocket->inetsocket);
 659                                 }
 660                                 else
 661                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 662 #ifdef WIN32
 663                         }
 664                         else
 665                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 666 #endif
 667                         break;
 668                 default:
 669                         break;
 670                 }
 671                 Z_Free(lhnetsocket);
 672         }
 673         return NULL;
 674 }
 675
 676 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 677 {
 678         if (lhnetsocket)
 679         {
 680                 // unlink from socket list
 681                 if (lhnetsocket->next == NULL)
 682                         return; // invalid!
 683                 lhnetsocket->next->prev = lhnetsocket->prev;
 684                 lhnetsocket->prev->next = lhnetsocket->next;
 685                 lhnetsocket->next = NULL;
 686                 lhnetsocket->prev = NULL;
 687
 688                 // no special close code for loopback, just inet
 689                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 690                 {
 691                         closesocket(lhnetsocket->inetsocket);
 692                 }
 693                 Z_Free(lhnetsocket);
 694         }
 695 }
 696
 697 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 698 {
 699         if (sock)
 700                 return &sock->address;
 701         else
 702                 return NULL;
 703 }
 704
 705 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *vaddress)
 706 {
 707         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 708         int value = 0;
 709         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 710                 return -1;
 711         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 712         {
 713                 time_t currenttime;
 714                 lhnetpacket_t *p, *pnext;
 715                 // scan for any old packets to timeout while searching for a packet
 716                 // that is waiting to be delivered to this socket
 717                 currenttime = time(NULL);
 718                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 719                 {
 720                         pnext = p->next;
 721                         if (p->timeout < currenttime)
 722                         {
 723                                 // unlink and free
 724                                 p->next->prev = p->prev;
 725                                 p->prev->next = p->next;
 726                                 Z_Free(p);
 727                                 continue;
 728                         }
 729 #ifndef STANDALONETEST
 730                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 731                                 continue;
 732 #endif
 733                         if (value == 0 && p->destinationport == lhnetsocket->address.port)
 734                         {
 735                                 if (p->length <= maxcontentlength)
 736                                 {
 737                                         lhnetaddressnative_t *localaddress = (lhnetaddressnative_t *)&lhnetsocket->address;
 738                                         *address = *localaddress;
 739                                         address->port = p->sourceport;
 740                                         memcpy(content, p->data, p->length);
 741                                         value = p->length;
 742                                 }
 743                                 else
 744                                         value = -1;
 745                                 // unlink and free
 746                                 p->next->prev = p->prev;
 747                                 p->prev->next = p->next;
 748                                 Z_Free(p);
 749                         }
 750                 }
 751         }
 752         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 753         {
 754                 unsigned int inetaddresslength;
 755                 address->addresstype = LHNETADDRESSTYPE_NONE;
 756                 inetaddresslength = sizeof(address->addr.in);
 757                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, &address->addr.sock, &inetaddresslength);
 758                 if (value > 0)
 759                 {
 760                         address->addresstype = LHNETADDRESSTYPE_INET4;
 761                         address->port = ntohs(address->addr.in.sin_port);
 762                         return value;
 763                 }
 764                 else if (value == -1)
 765                 {
 766                         int e = SOCKETERRNO;
 767                         if (e == EWOULDBLOCK)
 768                                 return 0;
 769                         switch (e)
 770                         {
 771                                 case ECONNREFUSED:
 772                                         Con_Print("Connection refused\n");
 773                                         return 0;
 774                         }
 775                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 776                 }
 777         }
 778         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 779         {
 780                 unsigned int inetaddresslength;
 781                 address->addresstype = LHNETADDRESSTYPE_NONE;
 782                 inetaddresslength = sizeof(address->addr.in6);
 783                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, &address->addr.sock, &inetaddresslength);
 784                 if (value > 0)
 785                 {
 786                         address->addresstype = LHNETADDRESSTYPE_INET6;
 787                         address->port = ntohs(address->addr.in6.sin6_port);
 788                         return value;
 789                 }
 790                 else if (value == -1)
 791                 {
 792                         int e = SOCKETERRNO;
 793                         if (e == EWOULDBLOCK)
 794                                 return 0;
 795                         switch (e)
 796                         {
 797                                 case ECONNREFUSED:
 798                                         Con_Print("Connection refused\n");
 799                                         return 0;
 800                         }
 801                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 802                 }
 803         }
 804         return value;
 805 }
 806
 807 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *vaddress)
 808 {
 809         lhnetaddressnative_t *address = (lhnetaddressnative_t *)vaddress;
 810         int value = -1;
 811         if (!lhnetsocket || !address || !content || contentlength < 1)
 812                 return -1;
 813         if (lhnetsocket->address.addresstype != address->addresstype)
 814                 return -1;
 815         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 816         {
 817                 lhnetpacket_t *p;
 818                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 819                 p->data = (void *)(p + 1);
 820                 memcpy(p->data, content, contentlength);
 821                 p->length = contentlength;
 822                 p->sourceport = lhnetsocket->address.port;
 823                 p->destinationport = address->port;
 824                 p->timeout = time(NULL) + 10;
 825                 p->next = &lhnet_packetlist;
 826                 p->prev = p->next->prev;
 827                 p->next->prev = p;
 828                 p->prev->next = p;
 829 #ifndef STANDALONETEST
 830                 p->sentdoubletime = realtime;
 831 #endif
 832                 value = contentlength;
 833         }
 834         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 835         {
 836                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addr.in, sizeof(struct sockaddr_in));
 837                 if (value == -1)
 838                 {
 839                         if (SOCKETERRNO == EWOULDBLOCK)
 840                                 return 0;
 841                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 842                 }
 843         }
 844         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 845         {
 846                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addr.in6, sizeof(struct sockaddr_in6));
 847                 if (value == -1)
 848                 {
 849                         if (SOCKETERRNO == EWOULDBLOCK)
 850                                 return 0;
 851                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 852                 }
 853         }
 854         return value;
 855 }
 856
 857 #ifdef STANDALONETEST
 858 int main(int argc, char **argv)
 859 {
 860 #if 1
 861         char *buffer = "test", buffer2[1024];
 862         int blen = strlen(buffer);
 863         int b2len = 1024;
 864         lhnetsocket_t *sock1;
 865         lhnetsocket_t *sock2;
 866         lhnetaddress_t myaddy1;
 867         lhnetaddress_t myaddy2;
 868         lhnetaddress_t myaddy3;
 869         lhnetaddress_t localhostaddy1;
 870         lhnetaddress_t localhostaddy2;
 871         int test1;
 872         int test2;
 873
 874         printf("calling LHNET_Init\n");
 875         LHNET_Init();
 876
 877         printf("calling LHNET_FromPort twice to create two local addresses\n");
 878         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
 879         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
 880         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
 881         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
 882
 883         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
 884         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
 885         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
 886
 887         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
 888         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
 889         printf("sleeping briefly\n");
 890 #ifdef WIN32
 891         Sleep (100);
 892 #else
 893         usleep (100000);
 894 #endif
 895         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
 896         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
 897         if (test2 > 0)
 898                 Con_Printf("socket to socket test succeeded\n");
 899         else
 900                 Con_Printf("socket to socket test failed\n");
 901
 902 #ifdef WIN32
 903         printf("press any key to exit\n");
 904         getchar();
 905 #endif
 906
 907         printf("calling LHNET_Shutdown\n");
 908         LHNET_Shutdown();
 909         printf("exiting\n");
 910         return 0;
 911 #else
 912         lhnetsocket_t *sock[16], *sendsock;
 913         int i;
 914         int numsockets;
 915         int count;
 916         int length;
 917         int port;
 918         time_t oldtime;
 919         time_t newtime;
 920         char *sendmessage;
 921         int sendmessagelength;
 922         lhnetaddress_t destaddress;
 923         lhnetaddress_t receiveaddress;
 924         lhnetaddress_t sockaddress[16];
 925         char buffer[1536], addressstring[128], addressstring2[128];
 926         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 927         {
 928                 printf("calling LHNET_Init()\n");
 929                 LHNET_Init();
 930
 931                 numsockets = 0;
 932                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 933                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 934                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 935
 936                 sendsock = NULL;
 937                 sendmessage = NULL;
 938                 sendmessagelength = 0;
 939
 940                 for (i = 0;i < numsockets;i++)
 941                 {
 942                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 943                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 944                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 945                         {
 946                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 947                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 948                         }
 949                         else
 950                         {
 951                                 printf("failed to open socket\n");
 952                                 if (i == 0)
 953                                 {
 954                                         LHNET_Shutdown();
 955                                         return -1;
 956                                 }
 957                         }
 958                 }
 959                 count = 0;
 960                 if (argc == 5)
 961                 {
 962                         count = atoi(argv[2]);
 963                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 964                         {
 965                                 sendmessage = argv[4];
 966                                 sendmessagelength = strlen(sendmessage);
 967                                 sendsock = NULL;
 968                                 for (i = 0;i < numsockets;i++)
 969                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 970                                                 sendsock = sock[i];
 971                                 if (sendsock == NULL)
 972                                 {
 973                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 974                                         argc = 2;
 975                                 }
 976                         }
 977                         else
 978                         {
 979                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 980                                 argc = 2;
 981                         }
 982                 }
 983                 printf("started, now listening for \"exit\" on the opened sockets\n");
 984                 oldtime = time(NULL);
 985                 for(;;)
 986                 {
 987 #ifdef WIN32
 988                         Sleep(1);
 989 #else
 990                         usleep(1);
 991 #endif
 992                         for (i = 0;i < numsockets;i++)
 993                         {
 994                                 if (sock[i])
 995                                 {
 996                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 997                                         if (length < 0)
 998                                                 printf("localsock read error: length < 0");
 999                                         else if (length > 0 && length < (int)sizeof(buffer))
1000                                         {
1001                                                 buffer[length] = 0;
1002                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
1003                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1004                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
1005                                                 if (!strcmp(buffer, "exit"))
1006                                                         break;
1007                                         }
1008                                 }
1009                         }
1010                         if (i < numsockets)
1011                                 break;
1012                         if (argc == 5 && count > 0)
1013                         {
1014                                 newtime = time(NULL);
1015                                 if (newtime != oldtime)
1016                                 {
1017                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
1018                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
1019                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
1020                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
1021                                         if (length == sendmessagelength)
1022                                                 printf("sent successfully\n");
1023                                         else
1024                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
1025                                         oldtime = newtime;
1026                                         count--;
1027                                         if (count <= 0)
1028                                                 printf("Done sending, still listening for \"exit\"\n");
1029                                 }
1030                         }
1031                 }
1032                 for (i = 0;i < numsockets;i++)
1033                 {
1034                         if (sock[i])
1035                         {
1036                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
1037                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
1038                                 LHNET_CloseSocket(sock[i]);
1039                         }
1040                 }
1041                 printf("calling LHNET_Shutdown()\n");
1042                 LHNET_Shutdown();
1043                 return 0;
1044         }
1045         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
1046         return -1;
1047 #endif
1048 }
1049 #endif
1050