lhnet.c

   1
   2 // Written by Forest Hale 2003-06-15 and placed into public domain.
   3
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <time.h>
   7 #include <string.h>
   8 #ifdef WIN32
   9 #include <winsock.h>
  10 #else
  11 #include <unistd.h>
  12 #include <sys/socket.h>
  13 #include <sys/ioctl.h>
  14 #include <errno.h>
  15 #include <netdb.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #endif
  19
  20 #ifdef __MORPHOS__
  21 #include <proto/socket.h>
  22 #endif
  23
  24 // for Z_Malloc/Z_Free in quake
  25 #ifndef STANDALONETEST
  26 #include "quakedef.h"
  27 #include "zone.h"
  28 #include "sys.h"
  29 #include "netconn.h"
  30 #else
  31 #define Con_Print printf
  32 #define Con_Printf printf
  33 #define Z_Malloc malloc
  34 #define Z_Free free
  35 #endif
  36
  37 #include "lhnet.h"
  38
  39 #if defined(WIN32)
  40 #define EWOULDBLOCK WSAEWOULDBLOCK
  41 #define ECONNREFUSED WSAECONNREFUSED
  42
  43 #define SOCKETERRNO WSAGetLastError()
  44
  45 #define SOCKLEN_T int
  46 #elif defined(__MORPHOS__)
  47 #define ioctlsocket IoctlSocket
  48 #define closesocket CloseSocket
  49 #define SOCKETERRNO Errno()
  50
  51 #define SOCKLEN_T int
  52 #else
  53 #define ioctlsocket ioctl
  54 #define closesocket close
  55 #define SOCKETERRNO errno
  56
  57 #define SOCKLEN_T socklen_t
  58 #endif
  59
  60 // to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
  61 #define MAX_NAMECACHE 64
  62 static struct namecache_s
  63 {
  64         lhnetaddress_t address;
  65         double expirationtime;
  66         char name[64];
  67 }
  68 namecache[MAX_NAMECACHE];
  69 static int namecacheposition = 0;
  70
  71 int LHNETADDRESS_FromPort(lhnetaddress_t *address, int addresstype, int port)
  72 {
  73         if (!address)
  74                 return 0;
  75         switch(addresstype)
  76         {
  77         case LHNETADDRESSTYPE_LOOP:
  78                 // local:port  (loopback)
  79                 memset(address, 0, sizeof(*address));
  80                 address->addresstype = LHNETADDRESSTYPE_LOOP;
  81                 address->addressdata.loop.port = port;
  82                 return 1;
  83         case LHNETADDRESSTYPE_INET4:
  84                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
  85                 memset(address, 0, sizeof(*address));
  86                 address->addresstype = LHNETADDRESSTYPE_INET4;
  87                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
  88                 address->addressdata.inet4.port = htons((unsigned short)port);
  89                 return 1;
  90         case LHNETADDRESSTYPE_INET6:
  91                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
  92                 memset(address, 0, sizeof(*address));
  93                 address->addresstype = LHNETADDRESSTYPE_INET6;
  94                 address->addressdata.inet6.family = LHNETADDRESSTYPE_INET6_FAMILY;
  95                 address->addressdata.inet6.port = htons((unsigned short)port);
  96                 return 1;
  97         }
  98         return 0;
  99 }
 100
 101 int LHNETADDRESS_FromString(lhnetaddress_t *address, const char *string, int defaultport)
 102 {
 103         int i, port, namelen, d1, d2, d3, d4;
 104         struct hostent *hostentry;
 105         const char *colon;
 106         char name[128];
 107         if (!address || !string || !*string)
 108                 return 0;
 109         memset(address, 0, sizeof(*address));
 110         address->addresstype = LHNETADDRESSTYPE_NONE;
 111         port = 0;
 112         colon = strrchr(string, ':');
 113         if (colon)
 114                 port = atoi(colon + 1);
 115         else
 116                 colon = string + strlen(string);
 117         if (port == 0)
 118                 port = defaultport;
 119         namelen = colon - string;
 120         if (namelen > 127)
 121                 namelen = 127;
 122         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
 123         {
 124                 string++;
 125                 namelen -= 2;
 126         }
 127         memcpy(name, string, namelen);
 128         name[namelen] = 0;
 129         // handle loopback
 130         if (!strcmp(name, "local"))
 131         {
 132                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 133                 address->addressdata.loop.port = port;
 134                 return 1;
 135         }
 136         // try to parse as dotted decimal ipv4 address first
 137         if (sscanf(name, "%d.%d.%d.%d", &d1, &d2, &d3, &d4) == 4 && (unsigned int)d1 < 256 && (unsigned int)d2 < 256 && (unsigned int)d3 < 256 && (unsigned int)d4 < 256)
 138         {
 139                 // parsed a valid ipv4 address
 140                 address->addresstype = LHNETADDRESSTYPE_INET4;
 141                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
 142                 address->addressdata.inet4.port = htons((unsigned short)port);
 143                 address->addressdata.inet4.address[0] = (unsigned char)d1;
 144                 address->addressdata.inet4.address[1] = (unsigned char)d2;
 145                 address->addressdata.inet4.address[2] = (unsigned char)d3;
 146                 address->addressdata.inet4.address[3] = (unsigned char)d4;
 147 #ifdef STANDALONETEST
 148                 printf("manual parsing of ipv4 dotted decimal address \"%s\" successful: %d.%d.%d.%d:%d\n", string, (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3], (int)ntohs(address->addressdata.inet4.port));
 149 #endif
 150                 return 1;
 151         }
 152         for (i = 0;i < MAX_NAMECACHE;i++)
 153                 if (!strcmp(namecache[i].name, name))
 154                         break;
 155 #ifdef STANDALONETEST
 156         if (i < MAX_NAMECACHE)
 157 #else
 158         if (i < MAX_NAMECACHE && Sys_DoubleTime() < namecache[i].expirationtime)
 159 #endif
 160         {
 161                 *address = namecache[i].address;
 162                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 163                 {
 164                         address->addressdata.inet6.port = htons((unsigned short)port);
 165                         return 1;
 166                 }
 167                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 168                 {
 169                         address->addressdata.inet4.port = htons((unsigned short)port);
 170                         return 1;
 171                 }
 172                 return 0;
 173         }
 174         // try gethostbyname (handles dns and other ip formats)
 175         hostentry = gethostbyname(name);
 176         if (hostentry)
 177         {
 178                 if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET6_FAMILY)
 179                 {
 180                         // great it worked
 181                         address->addresstype = LHNETADDRESSTYPE_INET6;
 182                         address->addressdata.inet6.family = hostentry->h_addrtype;
 183                         address->addressdata.inet6.port = htons((unsigned short)port);
 184                         memcpy(address->addressdata.inet6.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet6.address));
 185                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 186                                 namecache[namecacheposition].name[i] = name[i];
 187                         namecache[namecacheposition].name[i] = 0;
 188 #ifndef STANDALONETEST
 189                         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 190 #endif
 191                         namecache[namecacheposition].address = *address;
 192                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 193 #ifdef STANDALONETEST
 194                         printf("gethostbyname(\"%s\") returned ipv6 address [%x:%x:%x:%x:%x:%x:%x:%x]:%d\n", name, (int)address->addressdata.inet6.address[0], (int)address->addressdata.inet6.address[1], (int)address->addressdata.inet6.address[2], (int)address->addressdata.inet6.address[3], (int)address->addressdata.inet6.address[4], (int)address->addressdata.inet6.address[5], (int)address->addressdata.inet6.address[6], (int)address->addressdata.inet6.address[7], (int)ntohs(address->addressdata.inet6.port));
 195 #endif
 196                         return 1;
 197                 }
 198                 else if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET4_FAMILY)
 199                 {
 200                         // great it worked
 201                         address->addresstype = LHNETADDRESSTYPE_INET4;
 202                         address->addressdata.inet4.family = hostentry->h_addrtype;
 203                         address->addressdata.inet4.port = htons((unsigned short)port);
 204                         memcpy(address->addressdata.inet4.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet4.address));
 205                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 206                                 namecache[namecacheposition].name[i] = name[i];
 207                         namecache[namecacheposition].name[i] = 0;
 208 #ifndef STANDALONETEST
 209                         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 210 #endif
 211                         namecache[namecacheposition].address = *address;
 212                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 213 #ifdef STANDALONETEST
 214                         printf("gethostbyname(\"%s\") returned ipv4 address %d.%d.%d.%d:%d\n", name, (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3], (int)ntohs(address->addressdata.inet4.port));
 215 #endif
 216                         return 1;
 217                 }
 218         }
 219 #ifdef STANDALONETEST
 220         printf("gethostbyname failed on address \"%s\"\n", name);
 221 #endif
 222         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 223                 namecache[namecacheposition].name[i] = name[i];
 224         namecache[namecacheposition].name[i] = 0;
 225 #ifndef STANDALONETEST
 226         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 227 #endif
 228         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 229         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 230         return 0;
 231 }
 232
 233 int LHNETADDRESS_ToString(const lhnetaddress_t *address, char *string, int stringbuffersize, int includeport)
 234 {
 235         *string = 0;
 236         if (!address || !string || stringbuffersize < 1)
 237                 return 0;
 238         switch(address->addresstype)
 239         {
 240         default:
 241                 break;
 242         case LHNETADDRESSTYPE_LOOP:
 243                 if (includeport)
 244                 {
 245                         if (stringbuffersize >= 12)
 246                         {
 247                                 sprintf(string, "local:%d", (int)address->addressdata.loop.port);
 248                                 return 1;
 249                         }
 250                 }
 251                 else
 252                 {
 253                         if (stringbuffersize >= 6)
 254                         {
 255                                 memcpy(string, "local", 6);
 256                                 return 1;
 257                         }
 258                 }
 259                 break;
 260         case LHNETADDRESSTYPE_INET4:
 261                 if (includeport)
 262                 {
 263                         if (stringbuffersize >= 22)
 264                         {
 265                                 sprintf(string, "%d.%d.%d.%d:%d", (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3], (int)ntohs(address->addressdata.inet4.port));
 266                                 return 1;
 267                         }
 268                 }
 269                 else
 270                 {
 271                         if (stringbuffersize >= 16)
 272                         {
 273                                 sprintf(string, "%d.%d.%d.%d", (int)address->addressdata.inet4.address[0], (int)address->addressdata.inet4.address[1], (int)address->addressdata.inet4.address[2], (int)address->addressdata.inet4.address[3]);
 274                                 return 1;
 275                         }
 276                 }
 277                 break;
 278         case LHNETADDRESSTYPE_INET6:
 279                 if (includeport)
 280                 {
 281                         if (stringbuffersize >= 88)
 282                         {
 283                                 sprintf(string, "[%x:%x:%x:%x:%x:%x:%x:%x]:%d", (int)address->addressdata.inet6.address[0], (int)address->addressdata.inet6.address[1], (int)address->addressdata.inet6.address[2], (int)address->addressdata.inet6.address[3], (int)address->addressdata.inet6.address[4], (int)address->addressdata.inet6.address[5], (int)address->addressdata.inet6.address[6], (int)address->addressdata.inet6.address[7], (int)ntohs(address->addressdata.inet6.port));
 284                                 return 1;
 285                         }
 286                 }
 287                 else
 288                 {
 289                         if (stringbuffersize >= 80)
 290                         {
 291                                 sprintf(string, "%x:%x:%x:%x:%x:%x:%x:%x", (int)address->addressdata.inet6.address[0], (int)address->addressdata.inet6.address[1], (int)address->addressdata.inet6.address[2], (int)address->addressdata.inet6.address[3], (int)address->addressdata.inet6.address[4], (int)address->addressdata.inet6.address[5], (int)address->addressdata.inet6.address[6], (int)address->addressdata.inet6.address[7]);
 292                                 return 1;
 293                         }
 294                 }
 295                 break;
 296         }
 297         return 0;
 298 }
 299
 300 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 301 {
 302         if (address)
 303                 return address->addresstype;
 304         else
 305                 return LHNETADDRESSTYPE_NONE;
 306 }
 307
 308 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 309 {
 310         if (!address)
 311                 return -1;
 312         switch(address->addresstype)
 313         {
 314         case LHNETADDRESSTYPE_LOOP:
 315                 return address->addressdata.loop.port;
 316         case LHNETADDRESSTYPE_INET4:
 317                 return ntohs(address->addressdata.inet4.port);
 318         case LHNETADDRESSTYPE_INET6:
 319                 return ntohs(address->addressdata.inet6.port);
 320         default:
 321                 return -1;
 322         }
 323 }
 324
 325 int LHNETADDRESS_SetPort(lhnetaddress_t *address, int port)
 326 {
 327         if (!address)
 328                 return 0;
 329         switch(address->addresstype)
 330         {
 331         case LHNETADDRESSTYPE_LOOP:
 332                 address->addressdata.loop.port = port;
 333                 return 1;
 334         case LHNETADDRESSTYPE_INET4:
 335                 address->addressdata.inet4.port = htons((unsigned short)port);
 336                 return 1;
 337         case LHNETADDRESSTYPE_INET6:
 338                 address->addressdata.inet6.port = htons((unsigned short)port);
 339                 return 1;
 340         default:
 341                 return 0;
 342         }
 343 }
 344
 345 int LHNETADDRESS_Compare(const lhnetaddress_t *address1, const lhnetaddress_t *address2)
 346 {
 347         if (!address1 || !address2)
 348                 return 1;
 349         if (address1->addresstype != address2->addresstype)
 350                 return 1;
 351         switch(address1->addresstype)
 352         {
 353         case LHNETADDRESSTYPE_LOOP:
 354                 if (address1->addressdata.loop.port != address2->addressdata.loop.port)
 355                         return -1;
 356                 return 0;
 357         case LHNETADDRESSTYPE_INET4:
 358                 if (address1->addressdata.inet4.family != address2->addressdata.inet4.family)
 359                         return 1;
 360                 if (memcmp(address1->addressdata.inet4.address, address2->addressdata.inet4.address, sizeof(address1->addressdata.inet4.address)))
 361                         return 1;
 362                 if (address1->addressdata.inet4.port != address2->addressdata.inet4.port)
 363                         return -1;
 364                 return 0;
 365         case LHNETADDRESSTYPE_INET6:
 366                 if (address1->addressdata.inet6.family != address2->addressdata.inet6.family)
 367                         return 1;
 368                 if (memcmp(address1->addressdata.inet6.address, address2->addressdata.inet6.address, sizeof(address1->addressdata.inet6.address)))
 369                         return 1;
 370                 if (address1->addressdata.inet6.port != address2->addressdata.inet6.port)
 371                         return -1;
 372                 return 0;
 373         default:
 374                 return 1;
 375         }
 376 }
 377
 378 typedef struct lhnetpacket_s
 379 {
 380         void *data;
 381         int length;
 382         int sourceport;
 383         int destinationport;
 384         time_t timeout;
 385 #ifndef STANDALONETEST
 386         double sentdoubletime;
 387 #endif
 388         struct lhnetpacket_s *next, *prev;
 389 }
 390 lhnetpacket_t;
 391
 392 static int lhnet_active;
 393 static lhnetsocket_t lhnet_socketlist;
 394 static lhnetpacket_t lhnet_packetlist;
 395 #ifdef WIN32
 396 static int lhnet_didWSAStartup = 0;
 397 static WSADATA lhnet_winsockdata;
 398 #endif
 399
 400 void LHNET_Init(void)
 401 {
 402         if (lhnet_active)
 403                 return;
 404         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 405         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 406         lhnet_active = 1;
 407 #ifdef WIN32
 408         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 409         if (!lhnet_didWSAStartup)
 410                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 411 #endif
 412 }
 413
 414 void LHNET_Shutdown(void)
 415 {
 416         lhnetpacket_t *p;
 417         if (!lhnet_active)
 418                 return;
 419         while (lhnet_socketlist.next != &lhnet_socketlist)
 420                 LHNET_CloseSocket(lhnet_socketlist.next);
 421         while (lhnet_packetlist.next != &lhnet_packetlist)
 422         {
 423                 p = lhnet_packetlist.next;
 424                 p->prev->next = p->next;
 425                 p->next->prev = p->prev;
 426                 Z_Free(p);
 427         }
 428 #ifdef WIN32
 429         if (lhnet_didWSAStartup)
 430         {
 431                 lhnet_didWSAStartup = 0;
 432                 WSACleanup();
 433         }
 434 #endif
 435         lhnet_active = 0;
 436 }
 437
 438 static const char *LHNETPRIVATE_StrError(void)
 439 {
 440 #ifdef WIN32
 441         int i = WSAGetLastError();
 442         switch (i)
 443         {
 444                 case WSAEINTR:           return "WSAEINTR";
 445                 case WSAEBADF:           return "WSAEBADF";
 446                 case WSAEACCES:          return "WSAEACCES";
 447                 case WSAEFAULT:          return "WSAEFAULT";
 448                 case WSAEINVAL:          return "WSAEINVAL";
 449                 case WSAEMFILE:          return "WSAEMFILE";
 450                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 451                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 452                 case WSAEALREADY:        return "WSAEALREADY";
 453                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 454                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 455                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 456                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 457                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 458                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 459                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 460                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 461                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 462                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 463                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 464                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 465                 case WSAENETDOWN:        return "WSAENETDOWN";
 466                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 467                 case WSAENETRESET:       return "WSAENETRESET";
 468                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 469                 case WSAECONNRESET:      return "WSAECONNRESET";
 470                 case WSAENOBUFS:         return "WSAENOBUFS";
 471                 case WSAEISCONN:         return "WSAEISCONN";
 472                 case WSAENOTCONN:        return "WSAENOTCONN";
 473                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 474                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 475                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 476                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 477                 case WSAELOOP:           return "WSAELOOP";
 478                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 479                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 480                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 481                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 482                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 483                 case WSAEUSERS:          return "WSAEUSERS";
 484                 case WSAEDQUOT:          return "WSAEDQUOT";
 485                 case WSAESTALE:          return "WSAESTALE";
 486                 case WSAEREMOTE:         return "WSAEREMOTE";
 487                 case WSAEDISCON:         return "WSAEDISCON";
 488                 case 0:                  return "no error";
 489                 default:                 return "unknown WSAE error";
 490         }
 491 #else
 492         return strerror(errno);
 493 #endif
 494 }
 495
 496 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 497 {
 498         lhnetsocket_t *lhnetsocket, *s;
 499         if (!address)
 500                 return NULL;
 501         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 502         if (lhnetsocket)
 503         {
 504                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 505                 lhnetsocket->address = *address;
 506                 switch(lhnetsocket->address.addresstype)
 507                 {
 508                 case LHNETADDRESSTYPE_LOOP:
 509                         if (lhnetsocket->address.addressdata.loop.port == 0)
 510                         {
 511                                 // allocate a port dynamically
 512                                 // this search will always terminate because there is never
 513                                 // an allocated socket with port 0, so if the number wraps it
 514                                 // will find the port is unused, and then refuse to use port
 515                                 // 0, causing an intentional failure condition
 516                                 lhnetsocket->address.addressdata.loop.port = 1024;
 517                                 for (;;)
 518                                 {
 519                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 520                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 521                                                         break;
 522                                         if (s == &lhnet_socketlist)
 523                                                 break;
 524                                         lhnetsocket->address.addressdata.loop.port++;
 525                                 }
 526                         }
 527                         // check if the port is available
 528                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 529                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 530                                         break;
 531                         if (s == &lhnet_socketlist && lhnetsocket->address.addressdata.loop.port != 0)
 532                         {
 533                                 lhnetsocket->next = &lhnet_socketlist;
 534                                 lhnetsocket->prev = lhnetsocket->next->prev;
 535                                 lhnetsocket->next->prev = lhnetsocket;
 536                                 lhnetsocket->prev->next = lhnetsocket;
 537                                 return lhnetsocket;
 538                         }
 539                         break;
 540                 case LHNETADDRESSTYPE_INET4:
 541                 case LHNETADDRESSTYPE_INET6:
 542 #ifdef WIN32
 543                         if (lhnet_didWSAStartup)
 544                         {
 545 #endif
 546                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? LHNETADDRESSTYPE_INET6_FAMILY : LHNETADDRESSTYPE_INET4_FAMILY, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 547                                 {
 548 #ifdef WIN32
 549                                         u_long _true = 1;
 550 #else
 551                                         char _true = 1;
 552 #endif
 553                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 554                                         {
 555                                                 SOCKLEN_T namelen;
 556                                                 namelen = address->addresstype == LHNETADDRESSTYPE_INET6 ? sizeof(lhnetsocket->address.addressdata.inet6) : sizeof(lhnetsocket->address.addressdata.inet4);
 557                                                 if (bind(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, namelen) != -1)
 558                                                 {
 559                                                         int i = 1;
 560                                                         getsockname(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, &namelen);
 561                                                         // enable broadcast on this socket
 562                                                         setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 563                                                         lhnetsocket->next = &lhnet_socketlist;
 564                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 565                                                         lhnetsocket->next->prev = lhnetsocket;
 566                                                         lhnetsocket->prev->next = lhnetsocket;
 567                                                         return lhnetsocket;
 568                                                 }
 569                                                 else
 570                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 571                                         }
 572                                         else
 573                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 574                                         closesocket(lhnetsocket->inetsocket);
 575                                 }
 576                                 else
 577                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 578 #ifdef WIN32
 579                         }
 580                         else
 581                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 582 #endif
 583                         break;
 584                 default:
 585                         break;
 586                 }
 587                 Z_Free(lhnetsocket);
 588         }
 589         return NULL;
 590 }
 591
 592 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 593 {
 594         if (lhnetsocket)
 595         {
 596                 // unlink from socket list
 597                 if (lhnetsocket->next == NULL)
 598                         return; // invalid!
 599                 lhnetsocket->next->prev = lhnetsocket->prev;
 600                 lhnetsocket->prev->next = lhnetsocket->next;
 601                 lhnetsocket->next = NULL;
 602                 lhnetsocket->prev = NULL;
 603
 604                 // no special close code for loopback, just inet
 605                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 606                 {
 607                         closesocket(lhnetsocket->inetsocket);
 608                 }
 609                 Z_Free(lhnetsocket);
 610         }
 611 }
 612
 613 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 614 {
 615         if (sock)
 616                 return &sock->address;
 617         else
 618                 return NULL;
 619 }
 620
 621 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *address)
 622 {
 623         int value = 0;
 624         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 625                 return -1;
 626         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 627         {
 628                 time_t currenttime;
 629                 lhnetpacket_t *p, *pnext;
 630                 // scan for any old packets to timeout while searching for a packet
 631                 // that is waiting to be delivered to this socket
 632                 currenttime = time(NULL);
 633                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 634                 {
 635                         pnext = p->next;
 636                         if (p->timeout < currenttime)
 637                         {
 638                                 // unlink and free
 639                                 p->next->prev = p->prev;
 640                                 p->prev->next = p->next;
 641                                 Z_Free(p);
 642                                 continue;
 643                         }
 644 #ifndef STANDALONETEST
 645                         if (cl_netlocalping.value && (Sys_DoubleTime() - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 646                                 continue;
 647 #endif
 648                         if (value == 0 && p->destinationport == lhnetsocket->address.addressdata.loop.port)
 649                         {
 650                                 if (p->length <= maxcontentlength)
 651                                 {
 652                                         *address = lhnetsocket->address;
 653                                         address->addressdata.loop.port = p->sourceport;
 654                                         memcpy(content, p->data, p->length);
 655                                         value = p->length;
 656                                 }
 657                                 else
 658                                         value = -1;
 659                                 // unlink and free
 660                                 p->next->prev = p->prev;
 661                                 p->prev->next = p->next;
 662                                 Z_Free(p);
 663                         }
 664                 }
 665         }
 666         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 667         {
 668                 unsigned int inetaddresslength;
 669                 address->addresstype = LHNETADDRESSTYPE_NONE;
 670                 inetaddresslength = sizeof(address->addressdata.inet4);
 671                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet4, &inetaddresslength);
 672                 if (value > 0)
 673                 {
 674                         address->addresstype = LHNETADDRESSTYPE_INET4;
 675                         return value;
 676                 }
 677                 else if (value == -1)
 678                 {
 679                         int e = SOCKETERRNO;
 680                         if (e == EWOULDBLOCK)
 681                                 return 0;
 682                         switch (e)
 683                         {
 684                                 case ECONNREFUSED:
 685                                         Con_Print("Connection refused\n");
 686                                         return 0;
 687                         }
 688                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 689                 }
 690         }
 691         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 692         {
 693                 unsigned int inetaddresslength;
 694                 address->addresstype = LHNETADDRESSTYPE_NONE;
 695                 inetaddresslength = sizeof(address->addressdata.inet6);
 696                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet6, &inetaddresslength);
 697                 if (value > 0)
 698                 {
 699                         address->addresstype = LHNETADDRESSTYPE_INET6;
 700                         return value;
 701                 }
 702                 else if (value == -1)
 703                 {
 704                         int e = SOCKETERRNO;
 705                         if (e == EWOULDBLOCK)
 706                                 return 0;
 707                         switch (e)
 708                         {
 709                                 case ECONNREFUSED:
 710                                         Con_Print("Connection refused\n");
 711                                         return 0;
 712                         }
 713                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 714                 }
 715         }
 716         return value;
 717 }
 718
 719 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *address)
 720 {
 721         int value = -1;
 722         if (!lhnetsocket || !address || !content || contentlength < 1)
 723                 return -1;
 724         if (lhnetsocket->address.addresstype != address->addresstype)
 725                 return -1;
 726         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 727         {
 728                 lhnetpacket_t *p;
 729                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 730                 p->data = (void *)(p + 1);
 731                 memcpy(p->data, content, contentlength);
 732                 p->length = contentlength;
 733                 p->sourceport = lhnetsocket->address.addressdata.loop.port;
 734                 p->destinationport = address->addressdata.loop.port;
 735                 p->timeout = time(NULL) + 10;
 736                 p->next = &lhnet_packetlist;
 737                 p->prev = p->next->prev;
 738                 p->next->prev = p;
 739                 p->prev->next = p;
 740 #ifndef STANDALONETEST
 741                 p->sentdoubletime = Sys_DoubleTime();
 742 #endif
 743                 value = contentlength;
 744         }
 745         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 746         {
 747                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet4, sizeof(address->addressdata.inet4));
 748                 if (value == -1)
 749                 {
 750                         if (SOCKETERRNO == EWOULDBLOCK)
 751                                 return 0;
 752                         Con_Printf("LHNET_Read: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 753                 }
 754         }
 755         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 756         {
 757                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet6, sizeof(address->addressdata.inet6));
 758                 if (value == -1)
 759                 {
 760                         if (SOCKETERRNO == EWOULDBLOCK)
 761                                 return 0;
 762                         Con_Printf("LHNET_Read: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 763                 }
 764         }
 765         return value;
 766 }
 767
 768 #ifdef STANDALONETEST
 769 int main(int argc, char **argv)
 770 {
 771 #if 1
 772         char *buffer = "test", buffer2[1024];
 773         int blen = strlen(buffer);
 774         int b2len = 1024;
 775         lhnetsocket_t *sock1;
 776         lhnetsocket_t *sock2;
 777         lhnetaddress_t myaddy1;
 778         lhnetaddress_t myaddy2;
 779         lhnetaddress_t myaddy3;
 780         lhnetaddress_t localhostaddy1;
 781         lhnetaddress_t localhostaddy2;
 782         int test1;
 783         int test2;
 784
 785         printf("calling LHNET_Init\n");
 786         LHNET_Init();
 787
 788         printf("calling LHNET_FromPort twice to create two local addresses\n");
 789         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
 790         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
 791         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
 792         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
 793
 794         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
 795         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
 796         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
 797
 798         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
 799         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
 800         printf("sleeping briefly\n");
 801 #ifdef WIN32
 802         Sleep (100);
 803 #else
 804         usleep (100000);
 805 #endif
 806         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
 807         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
 808         if (test2 > 0)
 809                 Con_Printf("socket to socket test succeeded\n");
 810         else
 811                 Con_Printf("socket to socket test failed\n");
 812
 813 #ifdef WIN32
 814         printf("press any key to exit\n");
 815         getchar();
 816 #endif
 817
 818         printf("calling LHNET_Shutdown\n");
 819         LHNET_Shutdown();
 820         printf("exiting\n");
 821         return 0;
 822 #else
 823         lhnetsocket_t *sock[16], *sendsock;
 824         int i;
 825         int numsockets;
 826         int count;
 827         int length;
 828         int port;
 829         time_t oldtime;
 830         time_t newtime;
 831         char *sendmessage;
 832         int sendmessagelength;
 833         lhnetaddress_t destaddress;
 834         lhnetaddress_t receiveaddress;
 835         lhnetaddress_t sockaddress[16];
 836         char buffer[1536], addressstring[128], addressstring2[128];
 837         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 838         {
 839                 printf("calling LHNET_Init()\n");
 840                 LHNET_Init();
 841
 842                 numsockets = 0;
 843                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 844                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 845                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 846
 847                 sendsock = NULL;
 848                 sendmessage = NULL;
 849                 sendmessagelength = 0;
 850
 851                 for (i = 0;i < numsockets;i++)
 852                 {
 853                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 854                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 855                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 856                         {
 857                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 858                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 859                         }
 860                         else
 861                         {
 862                                 printf("failed to open socket\n");
 863                                 if (i == 0)
 864                                 {
 865                                         LHNET_Shutdown();
 866                                         return -1;
 867                                 }
 868                         }
 869                 }
 870                 count = 0;
 871                 if (argc == 5)
 872                 {
 873                         count = atoi(argv[2]);
 874                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 875                         {
 876                                 sendmessage = argv[4];
 877                                 sendmessagelength = strlen(sendmessage);
 878                                 sendsock = NULL;
 879                                 for (i = 0;i < numsockets;i++)
 880                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 881                                                 sendsock = sock[i];
 882                                 if (sendsock == NULL)
 883                                 {
 884                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 885                                         argc = 2;
 886                                 }
 887                         }
 888                         else
 889                         {
 890                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 891                                 argc = 2;
 892                         }
 893                 }
 894                 printf("started, now listening for \"exit\" on the opened sockets\n");
 895                 oldtime = time(NULL);
 896                 for(;;)
 897                 {
 898 #ifdef WIN32
 899                         Sleep(1);
 900 #else
 901                         usleep(1);
 902 #endif
 903                         for (i = 0;i < numsockets;i++)
 904                         {
 905                                 if (sock[i])
 906                                 {
 907                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 908                                         if (length < 0)
 909                                                 printf("localsock read error: length < 0");
 910                                         else if (length > 0 && length < (int)sizeof(buffer))
 911                                         {
 912                                                 buffer[length] = 0;
 913                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
 914                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 915                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
 916                                                 if (!strcmp(buffer, "exit"))
 917                                                         break;
 918                                         }
 919                                 }
 920                         }
 921                         if (i < numsockets)
 922                                 break;
 923                         if (argc == 5 && count > 0)
 924                         {
 925                                 newtime = time(NULL);
 926                                 if (newtime != oldtime)
 927                                 {
 928                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
 929                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
 930                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
 931                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
 932                                         if (length == sendmessagelength)
 933                                                 printf("sent successfully\n");
 934                                         else
 935                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
 936                                         oldtime = newtime;
 937                                         count--;
 938                                         if (count <= 0)
 939                                                 printf("Done sending, still listening for \"exit\"\n");
 940                                 }
 941                         }
 942                 }
 943                 for (i = 0;i < numsockets;i++)
 944                 {
 945                         if (sock[i])
 946                         {
 947                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 948                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
 949                                 LHNET_CloseSocket(sock[i]);
 950                         }
 951                 }
 952                 printf("calling LHNET_Shutdown()\n");
 953                 LHNET_Shutdown();
 954                 return 0;
 955         }
 956         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
 957         return -1;
 958 #endif
 959 }
 960 #endif
 961