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)
 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         if (i < MAX_NAMECACHE && Sys_DoubleTime() < namecache[i].expirationtime)
 156         {
 157                 *address = namecache[i].address;
 158                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 159                 {
 160                         address->addressdata.inet6.port = htons((unsigned short)port);
 161                         return 1;
 162                 }
 163                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 164                 {
 165                         address->addressdata.inet4.port = htons((unsigned short)port);
 166                         return 1;
 167                 }
 168                 return false;
 169         }
 170         // try gethostbyname (handles dns and other ip formats)
 171         hostentry = gethostbyname(name);
 172         if (hostentry)
 173         {
 174                 if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET6_FAMILY)
 175                 {
 176                         // great it worked
 177                         address->addresstype = LHNETADDRESSTYPE_INET6;
 178                         address->addressdata.inet6.family = hostentry->h_addrtype;
 179                         address->addressdata.inet6.port = htons((unsigned short)port);
 180                         memcpy(address->addressdata.inet6.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet6.address));
 181                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 182                                 namecache[namecacheposition].name[i] = name[i];
 183                         namecache[namecacheposition].name[i] = 0;
 184                         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 185                         namecache[namecacheposition].address = *address;
 186                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 187 #ifdef STANDALONETEST
 188                         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));
 189 #endif
 190                         return 1;
 191                 }
 192                 else if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET4_FAMILY)
 193                 {
 194                         // great it worked
 195                         address->addresstype = LHNETADDRESSTYPE_INET4;
 196                         address->addressdata.inet4.family = hostentry->h_addrtype;
 197                         address->addressdata.inet4.port = htons((unsigned short)port);
 198                         memcpy(address->addressdata.inet4.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet4.address));
 199                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 200                                 namecache[namecacheposition].name[i] = name[i];
 201                         namecache[namecacheposition].name[i] = 0;
 202                         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 203                         namecache[namecacheposition].address = *address;
 204                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 205 #ifdef STANDALONETEST
 206                         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));
 207 #endif
 208                         return 1;
 209                 }
 210         }
 211 #ifdef STANDALONETEST
 212         printf("gethostbyname failed on address \"%s\"\n", name);
 213 #endif
 214         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 215                 namecache[namecacheposition].name[i] = name[i];
 216         namecache[namecacheposition].name[i] = 0;
 217         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 218         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 219         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 220         return 0;
 221 }
 222
 223 int LHNETADDRESS_ToString(const lhnetaddress_t *address, char *string, int stringbuffersize, int includeport)
 224 {
 225         *string = 0;
 226         if (!address || !string || stringbuffersize < 1)
 227                 return 0;
 228         switch(address->addresstype)
 229         {
 230         default:
 231                 break;
 232         case LHNETADDRESSTYPE_LOOP:
 233                 if (includeport)
 234                 {
 235                         if (stringbuffersize >= 12)
 236                         {
 237                                 sprintf(string, "local:%d", (int)address->addressdata.loop.port);
 238                                 return 1;
 239                         }
 240                 }
 241                 else
 242                 {
 243                         if (stringbuffersize >= 6)
 244                         {
 245                                 strcpy(string, "local");
 246                                 return 1;
 247                         }
 248                 }
 249                 break;
 250         case LHNETADDRESSTYPE_INET4:
 251                 if (includeport)
 252                 {
 253                         if (stringbuffersize >= 22)
 254                         {
 255                                 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));
 256                                 return 1;
 257                         }
 258                 }
 259                 else
 260                 {
 261                         if (stringbuffersize >= 16)
 262                         {
 263                                 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]);
 264                                 return 1;
 265                         }
 266                 }
 267                 break;
 268         case LHNETADDRESSTYPE_INET6:
 269                 if (includeport)
 270                 {
 271                         if (stringbuffersize >= 88)
 272                         {
 273                                 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));
 274                                 return 1;
 275                         }
 276                 }
 277                 else
 278                 {
 279                         if (stringbuffersize >= 80)
 280                         {
 281                                 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]);
 282                                 return 1;
 283                         }
 284                 }
 285                 break;
 286         }
 287         return 0;
 288 }
 289
 290 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 291 {
 292         if (address)
 293                 return address->addresstype;
 294         else
 295                 return LHNETADDRESSTYPE_NONE;
 296 }
 297
 298 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 299 {
 300         if (!address)
 301                 return -1;
 302         switch(address->addresstype)
 303         {
 304         case LHNETADDRESSTYPE_LOOP:
 305                 return address->addressdata.loop.port;
 306         case LHNETADDRESSTYPE_INET4:
 307                 return ntohs(address->addressdata.inet4.port);
 308         case LHNETADDRESSTYPE_INET6:
 309                 return ntohs(address->addressdata.inet6.port);
 310         default:
 311                 return -1;
 312         }
 313 }
 314
 315 int LHNETADDRESS_SetPort(lhnetaddress_t *address, int port)
 316 {
 317         if (!address)
 318                 return 0;
 319         switch(address->addresstype)
 320         {
 321         case LHNETADDRESSTYPE_LOOP:
 322                 address->addressdata.loop.port = port;
 323                 return 1;
 324         case LHNETADDRESSTYPE_INET4:
 325                 address->addressdata.inet4.port = htons((unsigned short)port);
 326                 return 1;
 327         case LHNETADDRESSTYPE_INET6:
 328                 address->addressdata.inet6.port = htons((unsigned short)port);
 329                 return 1;
 330         default:
 331                 return 0;
 332         }
 333 }
 334
 335 int LHNETADDRESS_Compare(const lhnetaddress_t *address1, const lhnetaddress_t *address2)
 336 {
 337         if (!address1 || !address2)
 338                 return 1;
 339         if (address1->addresstype != address2->addresstype)
 340                 return 1;
 341         switch(address1->addresstype)
 342         {
 343         case LHNETADDRESSTYPE_LOOP:
 344                 if (address1->addressdata.loop.port != address2->addressdata.loop.port)
 345                         return -1;
 346                 return 0;
 347         case LHNETADDRESSTYPE_INET4:
 348                 if (address1->addressdata.inet4.family != address2->addressdata.inet4.family)
 349                         return 1;
 350                 if (memcmp(address1->addressdata.inet4.address, address2->addressdata.inet4.address, sizeof(address1->addressdata.inet4.address)))
 351                         return 1;
 352                 if (address1->addressdata.inet4.port != address2->addressdata.inet4.port)
 353                         return -1;
 354                 return 0;
 355         case LHNETADDRESSTYPE_INET6:
 356                 if (address1->addressdata.inet6.family != address2->addressdata.inet6.family)
 357                         return 1;
 358                 if (memcmp(address1->addressdata.inet6.address, address2->addressdata.inet6.address, sizeof(address1->addressdata.inet6.address)))
 359                         return 1;
 360                 if (address1->addressdata.inet6.port != address2->addressdata.inet6.port)
 361                         return -1;
 362                 return 0;
 363         default:
 364                 return 1;
 365         }
 366 }
 367
 368 typedef struct lhnetpacket_s
 369 {
 370         void *data;
 371         int length;
 372         int sourceport;
 373         int destinationport;
 374         time_t timeout;
 375 #ifndef STANDALONETEST
 376         double sentdoubletime;
 377 #endif
 378         struct lhnetpacket_s *next, *prev;
 379 }
 380 lhnetpacket_t;
 381
 382 static int lhnet_active;
 383 static lhnetsocket_t lhnet_socketlist;
 384 static lhnetpacket_t lhnet_packetlist;
 385 #ifdef WIN32
 386 static int lhnet_didWSAStartup = 0;
 387 static WSADATA lhnet_winsockdata;
 388 #endif
 389
 390 void LHNET_Init(void)
 391 {
 392         if (lhnet_active)
 393                 return;
 394         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 395         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 396         lhnet_active = 1;
 397 }
 398
 399 void LHNET_Shutdown(void)
 400 {
 401         lhnetpacket_t *p;
 402         if (!lhnet_active)
 403                 return;
 404         while (lhnet_socketlist.next != &lhnet_socketlist)
 405                 LHNET_CloseSocket(lhnet_socketlist.next);
 406         while (lhnet_packetlist.next != &lhnet_packetlist)
 407         {
 408                 p = lhnet_packetlist.next;
 409                 p->prev->next = p->next;
 410                 p->next->prev = p->prev;
 411                 Z_Free(p);
 412         }
 413         lhnet_active = 0;
 414 }
 415
 416 static const char *LHNETPRIVATE_StrError(void)
 417 {
 418 #ifdef WIN32
 419         int i = WSAGetLastError();
 420         switch (i)
 421         {
 422                 case WSAEINTR:           return "WSAEINTR";
 423                 case WSAEBADF:           return "WSAEBADF";
 424                 case WSAEACCES:          return "WSAEACCES";
 425                 case WSAEFAULT:          return "WSAEFAULT";
 426                 case WSAEINVAL:          return "WSAEINVAL";
 427                 case WSAEMFILE:          return "WSAEMFILE";
 428                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 429                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 430                 case WSAEALREADY:        return "WSAEALREADY";
 431                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 432                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 433                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 434                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 435                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 436                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 437                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 438                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 439                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 440                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 441                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 442                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 443                 case WSAENETDOWN:        return "WSAENETDOWN";
 444                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 445                 case WSAENETRESET:       return "WSAENETRESET";
 446                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 447                 case WSAECONNRESET:      return "WSAECONNRESET";
 448                 case WSAENOBUFS:         return "WSAENOBUFS";
 449                 case WSAEISCONN:         return "WSAEISCONN";
 450                 case WSAENOTCONN:        return "WSAENOTCONN";
 451                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 452                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 453                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 454                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 455                 case WSAELOOP:           return "WSAELOOP";
 456                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 457                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 458                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 459                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 460                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 461                 case WSAEUSERS:          return "WSAEUSERS";
 462                 case WSAEDQUOT:          return "WSAEDQUOT";
 463                 case WSAESTALE:          return "WSAESTALE";
 464                 case WSAEREMOTE:         return "WSAEREMOTE";
 465                 case WSAEDISCON:         return "WSAEDISCON";
 466                 case 0:                  return "no error";
 467                 default:                 return "unknown WSAE error";
 468         }
 469 #else
 470         return strerror(errno);
 471 #endif
 472 }
 473
 474 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 475 {
 476         lhnetsocket_t *lhnetsocket, *s;
 477         if (!address)
 478                 return NULL;
 479         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 480         if (lhnetsocket)
 481         {
 482                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 483                 lhnetsocket->address = *address;
 484                 switch(lhnetsocket->address.addresstype)
 485                 {
 486                 case LHNETADDRESSTYPE_LOOP:
 487                         if (lhnetsocket->address.addressdata.loop.port == 0)
 488                         {
 489                                 // allocate a port dynamically
 490                                 // this search will always terminate because there is never
 491                                 // an allocated socket with port 0, so if the number wraps it
 492                                 // will find the port is unused, and then refuse to use port
 493                                 // 0, causing an intentional failure condition
 494                                 lhnetsocket->address.addressdata.loop.port = 1024;
 495                                 for (;;)
 496                                 {
 497                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 498                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 499                                                         break;
 500                                         if (s == &lhnet_socketlist)
 501                                                 break;
 502                                         lhnetsocket->address.addressdata.loop.port++;
 503                                 }
 504                         }
 505                         // check if the port is available
 506                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 507                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 508                                         break;
 509                         if (s == &lhnet_socketlist && lhnetsocket->address.addressdata.loop.port != 0)
 510                         {
 511                                 lhnetsocket->next = &lhnet_socketlist;
 512                                 lhnetsocket->prev = lhnetsocket->next->prev;
 513                                 lhnetsocket->next->prev = lhnetsocket;
 514                                 lhnetsocket->prev->next = lhnetsocket;
 515                                 return lhnetsocket;
 516                         }
 517                         break;
 518                 case LHNETADDRESSTYPE_INET4:
 519                 case LHNETADDRESSTYPE_INET6:
 520 #ifdef WIN32
 521                         if (lhnet_didWSAStartup || (lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata)))
 522                         {
 523 #endif
 524                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? LHNETADDRESSTYPE_INET6_FAMILY : LHNETADDRESSTYPE_INET4_FAMILY, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 525                                 {
 526 #ifdef WIN32
 527                                         u_long _true = 1;
 528 #else
 529                                         char _true = 1;
 530 #endif
 531                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 532                                         {
 533                                                 SOCKLEN_T namelen;
 534                                                 namelen = address->addresstype == LHNETADDRESSTYPE_INET6 ? sizeof(lhnetsocket->address.addressdata.inet6) : sizeof(lhnetsocket->address.addressdata.inet4);
 535                                                 if (bind(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, namelen) != -1)
 536                                                 {
 537                                                         int i = 1;
 538                                                         getsockname(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, &namelen);
 539                                                         // enable broadcast on this socket
 540                                                         setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 541                                                         lhnetsocket->next = &lhnet_socketlist;
 542                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 543                                                         lhnetsocket->next->prev = lhnetsocket;
 544                                                         lhnetsocket->prev->next = lhnetsocket;
 545                                                         return lhnetsocket;
 546                                                 }
 547                                                 else
 548                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 549                                         }
 550                                         else
 551                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 552                                         closesocket(lhnetsocket->inetsocket);
 553                                 }
 554                                 else
 555                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 556 #ifdef WIN32
 557                         }
 558                         else
 559                                 Con_Print("LHNET_OpenSocket_Connectionless: WSAStartup failed\n");
 560 #endif
 561                         break;
 562                 default:
 563                         break;
 564                 }
 565                 Z_Free(lhnetsocket);
 566         }
 567         return NULL;
 568 }
 569
 570 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 571 {
 572         if (lhnetsocket)
 573         {
 574                 // unlink from socket list
 575                 if (lhnetsocket->next == NULL)
 576                         return; // invalid!
 577                 lhnetsocket->next->prev = lhnetsocket->prev;
 578                 lhnetsocket->prev->next = lhnetsocket->next;
 579                 lhnetsocket->next = NULL;
 580                 lhnetsocket->prev = NULL;
 581
 582                 // no special close code for loopback, just inet
 583                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 584                 {
 585                         closesocket(lhnetsocket->inetsocket);
 586                 }
 587 #ifdef WIN32
 588                 if (lhnet_socketlist.next == &lhnet_socketlist && lhnet_didWSAStartup)
 589                 {
 590                         lhnet_didWSAStartup = 0;
 591                         WSACleanup();
 592                 }
 593 #endif
 594                 Z_Free(lhnetsocket);
 595         }
 596 }
 597
 598 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 599 {
 600         if (sock)
 601                 return &sock->address;
 602         else
 603                 return NULL;
 604 }
 605
 606 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *address)
 607 {
 608         int value = 0;
 609         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 610                 return -1;
 611         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 612         {
 613                 time_t currenttime;
 614                 lhnetpacket_t *p, *pnext;
 615                 // scan for any old packets to timeout while searching for a packet
 616                 // that is waiting to be delivered to this socket
 617                 currenttime = time(NULL);
 618                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 619                 {
 620                         pnext = p->next;
 621                         if (p->timeout < currenttime)
 622                         {
 623                                 // unlink and free
 624                                 p->next->prev = p->prev;
 625                                 p->prev->next = p->next;
 626                                 Z_Free(p);
 627                                 continue;
 628                         }
 629 #ifndef STANDALONETEST
 630                         if (cl_netlocalping.value && (Sys_DoubleTime() - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 631                                 continue;
 632 #endif
 633                         if (value == 0 && p->destinationport == lhnetsocket->address.addressdata.loop.port)
 634                         {
 635                                 if (p->length <= maxcontentlength)
 636                                 {
 637                                         *address = lhnetsocket->address;
 638                                         address->addressdata.loop.port = p->sourceport;
 639                                         memcpy(content, p->data, p->length);
 640                                         value = p->length;
 641                                 }
 642                                 else
 643                                         value = -1;
 644                                 // unlink and free
 645                                 p->next->prev = p->prev;
 646                                 p->prev->next = p->next;
 647                                 Z_Free(p);
 648                         }
 649                 }
 650         }
 651         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 652         {
 653                 unsigned int inetaddresslength;
 654                 address->addresstype = LHNETADDRESSTYPE_NONE;
 655                 inetaddresslength = sizeof(address->addressdata.inet4);
 656                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet4, &inetaddresslength);
 657                 if (value > 0)
 658                 {
 659                         address->addresstype = LHNETADDRESSTYPE_INET4;
 660                         return value;
 661                 }
 662                 else if (value == -1)
 663                 {
 664                         int e = SOCKETERRNO;
 665                         if (e == EWOULDBLOCK)
 666                                 return 0;
 667                         switch (e)
 668                         {
 669                                 case ECONNREFUSED:
 670                                         Con_Print("Connection refused\n");
 671                                         return 0;
 672                         }
 673                 }
 674         }
 675         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 676         {
 677                 unsigned int inetaddresslength;
 678                 address->addresstype = LHNETADDRESSTYPE_NONE;
 679                 inetaddresslength = sizeof(address->addressdata.inet6);
 680                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet6, &inetaddresslength);
 681                 if (value > 0)
 682                 {
 683                         address->addresstype = LHNETADDRESSTYPE_INET6;
 684                         return value;
 685                 }
 686                 else if (value == -1)
 687                 {
 688                         int e = SOCKETERRNO;
 689                         if (e == EWOULDBLOCK)
 690                                 return 0;
 691                         switch (e)
 692                         {
 693                                 case ECONNREFUSED:
 694                                         Con_Print("Connection refused\n");
 695                                         return 0;
 696                         }
 697                 }
 698         }
 699         return value;
 700 }
 701
 702 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *address)
 703 {
 704         int value = -1;
 705         if (!lhnetsocket || !address || !content || contentlength < 1)
 706                 return -1;
 707         if (lhnetsocket->address.addresstype != address->addresstype)
 708                 return -1;
 709         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 710         {
 711                 lhnetpacket_t *p;
 712                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 713                 p->data = (void *)(p + 1);
 714                 memcpy(p->data, content, contentlength);
 715                 p->length = contentlength;
 716                 p->sourceport = lhnetsocket->address.addressdata.loop.port;
 717                 p->destinationport = address->addressdata.loop.port;
 718                 p->timeout = time(NULL) + 10;
 719                 p->next = &lhnet_packetlist;
 720                 p->prev = p->next->prev;
 721                 p->next->prev = p;
 722                 p->prev->next = p;
 723 #ifndef STANDALONETEST
 724                 p->sentdoubletime = Sys_DoubleTime();
 725 #endif
 726                 value = contentlength;
 727         }
 728         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 729         {
 730                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet4, sizeof(address->addressdata.inet4));
 731                 if (value == -1)
 732                 {
 733                         if (SOCKETERRNO == EWOULDBLOCK)
 734                                 return 0;
 735                 }
 736         }
 737         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 738         {
 739                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet6, sizeof(address->addressdata.inet6));
 740                 if (value == -1)
 741                 {
 742                         if (SOCKETERRNO == EWOULDBLOCK)
 743                                 return 0;
 744                 }
 745         }
 746         return value;
 747 }
 748
 749 #ifdef STANDALONETEST
 750 int main(int argc, char **argv)
 751 {
 752         lhnetsocket_t *sock[16], *sendsock;
 753         int i;
 754         int numsockets;
 755         int count;
 756         int length;
 757         int port;
 758         time_t oldtime;
 759         time_t newtime;
 760         char *sendmessage;
 761         int sendmessagelength;
 762         lhnetaddress_t destaddress;
 763         lhnetaddress_t receiveaddress;
 764         lhnetaddress_t sockaddress[16];
 765         char buffer[1536], addressstring[128], addressstring2[128];
 766         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 767         {
 768                 printf("calling LHNET_Init()\n");
 769                 LHNET_Init();
 770
 771                 numsockets = 0;
 772                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 773                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 774                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 775
 776                 sendsock = NULL;
 777                 sendmessage = NULL;
 778                 sendmessagelength = 0;
 779
 780                 for (i = 0;i < numsockets;i++)
 781                 {
 782                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 783                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 784                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 785                         {
 786                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 787                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 788                         }
 789                         else
 790                         {
 791                                 printf("failed to open socket\n");
 792                                 if (i == 0)
 793                                 {
 794                                         LHNET_Shutdown();
 795                                         return -1;
 796                                 }
 797                         }
 798                 }
 799                 count = 0;
 800                 if (argc == 5)
 801                 {
 802                         count = atoi(argv[2]);
 803                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 804                         {
 805                                 sendmessage = argv[4];
 806                                 sendmessagelength = strlen(sendmessage);
 807                                 sendsock = NULL;
 808                                 for (i = 0;i < numsockets;i++)
 809                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 810                                                 sendsock = sock[i];
 811                                 if (sendsock == NULL)
 812                                 {
 813                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 814                                         argc = 2;
 815                                 }
 816                         }
 817                         else
 818                         {
 819                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 820                                 argc = 2;
 821                         }
 822                 }
 823                 printf("started, now listening for \"exit\" on the opened sockets\n");
 824                 oldtime = time(NULL);
 825                 for(;;)
 826                 {
 827 #ifdef WIN32
 828                         Sleep(1);
 829 #else
 830                         usleep(1);
 831 #endif
 832                         for (i = 0;i < numsockets;i++)
 833                         {
 834                                 if (sock[i])
 835                                 {
 836                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 837                                         if (length < 0)
 838                                                 printf("localsock read error: length < 0");
 839                                         else if (length > 0 && length < (int)sizeof(buffer))
 840                                         {
 841                                                 buffer[length] = 0;
 842                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
 843                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 844                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
 845                                                 if (!strcmp(buffer, "exit"))
 846                                                         break;
 847                                         }
 848                                 }
 849                         }
 850                         if (i < numsockets)
 851                                 break;
 852                         if (argc == 5 && count > 0)
 853                         {
 854                                 newtime = time(NULL);
 855                                 if (newtime != oldtime)
 856                                 {
 857                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
 858                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
 859                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
 860                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
 861                                         if (length == sendmessagelength)
 862                                                 printf("sent successfully\n");
 863                                         else
 864                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
 865                                         oldtime = newtime;
 866                                         count--;
 867                                         if (count <= 0)
 868                                                 printf("Done sending, still listening for \"exit\"\n");
 869                                 }
 870                         }
 871                 }
 872                 for (i = 0;i < numsockets;i++)
 873                 {
 874                         if (sock[i])
 875                         {
 876                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 877                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
 878                                 LHNET_CloseSocket(sock[i]);
 879                         }
 880                 }
 881                 printf("calling LHNET_Shutdown()\n");
 882                 LHNET_Shutdown();
 883                 return 0;
 884         }
 885         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
 886         return -1;
 887 }
 888 #endif
 889