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         // note this supports partial ip addresses
 138         d1 = d2 = d3 = d4 = 0;
 139         if (sscanf(name, "%d.%d.%d.%d", &d1, &d2, &d3, &d4) >= 1 && (unsigned int)d1 < 256 && (unsigned int)d2 < 256 && (unsigned int)d3 < 256 && (unsigned int)d4 < 256)
 140         {
 141                 // parsed a valid ipv4 address
 142                 address->addresstype = LHNETADDRESSTYPE_INET4;
 143                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
 144                 address->addressdata.inet4.port = htons((unsigned short)port);
 145                 address->addressdata.inet4.address[0] = (unsigned char)d1;
 146                 address->addressdata.inet4.address[1] = (unsigned char)d2;
 147                 address->addressdata.inet4.address[2] = (unsigned char)d3;
 148                 address->addressdata.inet4.address[3] = (unsigned char)d4;
 149 #ifdef STANDALONETEST
 150                 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));
 151 #endif
 152                 return 1;
 153         }
 154         for (i = 0;i < MAX_NAMECACHE;i++)
 155                 if (!strcmp(namecache[i].name, name))
 156                         break;
 157 #ifdef STANDALONETEST
 158         if (i < MAX_NAMECACHE)
 159 #else
 160         if (i < MAX_NAMECACHE && Sys_DoubleTime() < namecache[i].expirationtime)
 161 #endif
 162         {
 163                 *address = namecache[i].address;
 164                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 165                 {
 166                         address->addressdata.inet6.port = htons((unsigned short)port);
 167                         return 1;
 168                 }
 169                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 170                 {
 171                         address->addressdata.inet4.port = htons((unsigned short)port);
 172                         return 1;
 173                 }
 174                 return 0;
 175         }
 176         // try gethostbyname (handles dns and other ip formats)
 177         hostentry = gethostbyname(name);
 178         if (hostentry)
 179         {
 180                 if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET6_FAMILY)
 181                 {
 182                         // great it worked
 183                         address->addresstype = LHNETADDRESSTYPE_INET6;
 184                         address->addressdata.inet6.family = hostentry->h_addrtype;
 185                         address->addressdata.inet6.port = htons((unsigned short)port);
 186                         memcpy(address->addressdata.inet6.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet6.address));
 187                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 188                                 namecache[namecacheposition].name[i] = name[i];
 189                         namecache[namecacheposition].name[i] = 0;
 190 #ifndef STANDALONETEST
 191                         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 192 #endif
 193                         namecache[namecacheposition].address = *address;
 194                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 195 #ifdef STANDALONETEST
 196                         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));
 197 #endif
 198                         return 1;
 199                 }
 200                 else if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET4_FAMILY)
 201                 {
 202                         // great it worked
 203                         address->addresstype = LHNETADDRESSTYPE_INET4;
 204                         address->addressdata.inet4.family = hostentry->h_addrtype;
 205                         address->addressdata.inet4.port = htons((unsigned short)port);
 206                         memcpy(address->addressdata.inet4.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet4.address));
 207                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 208                                 namecache[namecacheposition].name[i] = name[i];
 209                         namecache[namecacheposition].name[i] = 0;
 210 #ifndef STANDALONETEST
 211                         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 212 #endif
 213                         namecache[namecacheposition].address = *address;
 214                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 215 #ifdef STANDALONETEST
 216                         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));
 217 #endif
 218                         return 1;
 219                 }
 220         }
 221 #ifdef STANDALONETEST
 222         printf("gethostbyname failed on address \"%s\"\n", name);
 223 #endif
 224         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 225                 namecache[namecacheposition].name[i] = name[i];
 226         namecache[namecacheposition].name[i] = 0;
 227 #ifndef STANDALONETEST
 228         namecache[namecacheposition].expirationtime = Sys_DoubleTime() + 12 * 3600; // 12 hours
 229 #endif
 230         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 231         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 232         return 0;
 233 }
 234
 235 int LHNETADDRESS_ToString(const lhnetaddress_t *address, char *string, int stringbuffersize, int includeport)
 236 {
 237         *string = 0;
 238         if (!address || !string || stringbuffersize < 1)
 239                 return 0;
 240         switch(address->addresstype)
 241         {
 242         default:
 243                 break;
 244         case LHNETADDRESSTYPE_LOOP:
 245                 if (includeport)
 246                 {
 247                         if (stringbuffersize >= 12)
 248                         {
 249                                 sprintf(string, "local:%d", (int)address->addressdata.loop.port);
 250                                 return 1;
 251                         }
 252                 }
 253                 else
 254                 {
 255                         if (stringbuffersize >= 6)
 256                         {
 257                                 memcpy(string, "local", 6);
 258                                 return 1;
 259                         }
 260                 }
 261                 break;
 262         case LHNETADDRESSTYPE_INET4:
 263                 if (includeport)
 264                 {
 265                         if (stringbuffersize >= 22)
 266                         {
 267                                 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));
 268                                 return 1;
 269                         }
 270                 }
 271                 else
 272                 {
 273                         if (stringbuffersize >= 16)
 274                         {
 275                                 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]);
 276                                 return 1;
 277                         }
 278                 }
 279                 break;
 280         case LHNETADDRESSTYPE_INET6:
 281                 if (includeport)
 282                 {
 283                         if (stringbuffersize >= 88)
 284                         {
 285                                 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));
 286                                 return 1;
 287                         }
 288                 }
 289                 else
 290                 {
 291                         if (stringbuffersize >= 80)
 292                         {
 293                                 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]);
 294                                 return 1;
 295                         }
 296                 }
 297                 break;
 298         }
 299         return 0;
 300 }
 301
 302 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 303 {
 304         if (address)
 305                 return address->addresstype;
 306         else
 307                 return LHNETADDRESSTYPE_NONE;
 308 }
 309
 310 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 311 {
 312         if (!address)
 313                 return -1;
 314         switch(address->addresstype)
 315         {
 316         case LHNETADDRESSTYPE_LOOP:
 317                 return address->addressdata.loop.port;
 318         case LHNETADDRESSTYPE_INET4:
 319                 return ntohs(address->addressdata.inet4.port);
 320         case LHNETADDRESSTYPE_INET6:
 321                 return ntohs(address->addressdata.inet6.port);
 322         default:
 323                 return -1;
 324         }
 325 }
 326
 327 int LHNETADDRESS_SetPort(lhnetaddress_t *address, int port)
 328 {
 329         if (!address)
 330                 return 0;
 331         switch(address->addresstype)
 332         {
 333         case LHNETADDRESSTYPE_LOOP:
 334                 address->addressdata.loop.port = port;
 335                 return 1;
 336         case LHNETADDRESSTYPE_INET4:
 337                 address->addressdata.inet4.port = htons((unsigned short)port);
 338                 return 1;
 339         case LHNETADDRESSTYPE_INET6:
 340                 address->addressdata.inet6.port = htons((unsigned short)port);
 341                 return 1;
 342         default:
 343                 return 0;
 344         }
 345 }
 346
 347 int LHNETADDRESS_Compare(const lhnetaddress_t *address1, const lhnetaddress_t *address2)
 348 {
 349         if (!address1 || !address2)
 350                 return 1;
 351         if (address1->addresstype != address2->addresstype)
 352                 return 1;
 353         switch(address1->addresstype)
 354         {
 355         case LHNETADDRESSTYPE_LOOP:
 356                 if (address1->addressdata.loop.port != address2->addressdata.loop.port)
 357                         return -1;
 358                 return 0;
 359         case LHNETADDRESSTYPE_INET4:
 360                 if (address1->addressdata.inet4.family != address2->addressdata.inet4.family)
 361                         return 1;
 362                 if (memcmp(address1->addressdata.inet4.address, address2->addressdata.inet4.address, sizeof(address1->addressdata.inet4.address)))
 363                         return 1;
 364                 if (address1->addressdata.inet4.port != address2->addressdata.inet4.port)
 365                         return -1;
 366                 return 0;
 367         case LHNETADDRESSTYPE_INET6:
 368                 if (address1->addressdata.inet6.family != address2->addressdata.inet6.family)
 369                         return 1;
 370                 if (memcmp(address1->addressdata.inet6.address, address2->addressdata.inet6.address, sizeof(address1->addressdata.inet6.address)))
 371                         return 1;
 372                 if (address1->addressdata.inet6.port != address2->addressdata.inet6.port)
 373                         return -1;
 374                 return 0;
 375         default:
 376                 return 1;
 377         }
 378 }
 379
 380 typedef struct lhnetpacket_s
 381 {
 382         void *data;
 383         int length;
 384         int sourceport;
 385         int destinationport;
 386         time_t timeout;
 387 #ifndef STANDALONETEST
 388         double sentdoubletime;
 389 #endif
 390         struct lhnetpacket_s *next, *prev;
 391 }
 392 lhnetpacket_t;
 393
 394 static int lhnet_active;
 395 static lhnetsocket_t lhnet_socketlist;
 396 static lhnetpacket_t lhnet_packetlist;
 397 #ifdef WIN32
 398 static int lhnet_didWSAStartup = 0;
 399 static WSADATA lhnet_winsockdata;
 400 #endif
 401
 402 void LHNET_Init(void)
 403 {
 404         if (lhnet_active)
 405                 return;
 406         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 407         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 408         lhnet_active = 1;
 409 #ifdef WIN32
 410         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 411         if (!lhnet_didWSAStartup)
 412                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 413 #endif
 414 }
 415
 416 void LHNET_Shutdown(void)
 417 {
 418         lhnetpacket_t *p;
 419         if (!lhnet_active)
 420                 return;
 421         while (lhnet_socketlist.next != &lhnet_socketlist)
 422                 LHNET_CloseSocket(lhnet_socketlist.next);
 423         while (lhnet_packetlist.next != &lhnet_packetlist)
 424         {
 425                 p = lhnet_packetlist.next;
 426                 p->prev->next = p->next;
 427                 p->next->prev = p->prev;
 428                 Z_Free(p);
 429         }
 430 #ifdef WIN32
 431         if (lhnet_didWSAStartup)
 432         {
 433                 lhnet_didWSAStartup = 0;
 434                 WSACleanup();
 435         }
 436 #endif
 437         lhnet_active = 0;
 438 }
 439
 440 static const char *LHNETPRIVATE_StrError(void)
 441 {
 442 #ifdef WIN32
 443         int i = WSAGetLastError();
 444         switch (i)
 445         {
 446                 case WSAEINTR:           return "WSAEINTR";
 447                 case WSAEBADF:           return "WSAEBADF";
 448                 case WSAEACCES:          return "WSAEACCES";
 449                 case WSAEFAULT:          return "WSAEFAULT";
 450                 case WSAEINVAL:          return "WSAEINVAL";
 451                 case WSAEMFILE:          return "WSAEMFILE";
 452                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 453                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 454                 case WSAEALREADY:        return "WSAEALREADY";
 455                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 456                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 457                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 458                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 459                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 460                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 461                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 462                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 463                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 464                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 465                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 466                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 467                 case WSAENETDOWN:        return "WSAENETDOWN";
 468                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 469                 case WSAENETRESET:       return "WSAENETRESET";
 470                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 471                 case WSAECONNRESET:      return "WSAECONNRESET";
 472                 case WSAENOBUFS:         return "WSAENOBUFS";
 473                 case WSAEISCONN:         return "WSAEISCONN";
 474                 case WSAENOTCONN:        return "WSAENOTCONN";
 475                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 476                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 477                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 478                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 479                 case WSAELOOP:           return "WSAELOOP";
 480                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 481                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 482                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 483                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 484                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 485                 case WSAEUSERS:          return "WSAEUSERS";
 486                 case WSAEDQUOT:          return "WSAEDQUOT";
 487                 case WSAESTALE:          return "WSAESTALE";
 488                 case WSAEREMOTE:         return "WSAEREMOTE";
 489                 case WSAEDISCON:         return "WSAEDISCON";
 490                 case 0:                  return "no error";
 491                 default:                 return "unknown WSAE error";
 492         }
 493 #else
 494         return strerror(errno);
 495 #endif
 496 }
 497
 498 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 499 {
 500         lhnetsocket_t *lhnetsocket, *s;
 501         if (!address)
 502                 return NULL;
 503         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 504         if (lhnetsocket)
 505         {
 506                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 507                 lhnetsocket->address = *address;
 508                 switch(lhnetsocket->address.addresstype)
 509                 {
 510                 case LHNETADDRESSTYPE_LOOP:
 511                         if (lhnetsocket->address.addressdata.loop.port == 0)
 512                         {
 513                                 // allocate a port dynamically
 514                                 // this search will always terminate because there is never
 515                                 // an allocated socket with port 0, so if the number wraps it
 516                                 // will find the port is unused, and then refuse to use port
 517                                 // 0, causing an intentional failure condition
 518                                 lhnetsocket->address.addressdata.loop.port = 1024;
 519                                 for (;;)
 520                                 {
 521                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 522                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 523                                                         break;
 524                                         if (s == &lhnet_socketlist)
 525                                                 break;
 526                                         lhnetsocket->address.addressdata.loop.port++;
 527                                 }
 528                         }
 529                         // check if the port is available
 530                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 531                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 532                                         break;
 533                         if (s == &lhnet_socketlist && lhnetsocket->address.addressdata.loop.port != 0)
 534                         {
 535                                 lhnetsocket->next = &lhnet_socketlist;
 536                                 lhnetsocket->prev = lhnetsocket->next->prev;
 537                                 lhnetsocket->next->prev = lhnetsocket;
 538                                 lhnetsocket->prev->next = lhnetsocket;
 539                                 return lhnetsocket;
 540                         }
 541                         break;
 542                 case LHNETADDRESSTYPE_INET4:
 543                 case LHNETADDRESSTYPE_INET6:
 544 #ifdef WIN32
 545                         if (lhnet_didWSAStartup)
 546                         {
 547 #endif
 548                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? LHNETADDRESSTYPE_INET6_FAMILY : LHNETADDRESSTYPE_INET4_FAMILY, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 549                                 {
 550 #ifdef WIN32
 551                                         u_long _true = 1;
 552 #else
 553                                         char _true = 1;
 554 #endif
 555                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 556                                         {
 557                                                 SOCKLEN_T namelen;
 558                                                 namelen = address->addresstype == LHNETADDRESSTYPE_INET6 ? sizeof(lhnetsocket->address.addressdata.inet6) : sizeof(lhnetsocket->address.addressdata.inet4);
 559                                                 if (bind(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, namelen) != -1)
 560                                                 {
 561                                                         int i = 1;
 562                                                         getsockname(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, &namelen);
 563                                                         // enable broadcast on this socket
 564                                                         setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 565                                                         lhnetsocket->next = &lhnet_socketlist;
 566                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 567                                                         lhnetsocket->next->prev = lhnetsocket;
 568                                                         lhnetsocket->prev->next = lhnetsocket;
 569                                                         return lhnetsocket;
 570                                                 }
 571                                                 else
 572                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 573                                         }
 574                                         else
 575                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 576                                         closesocket(lhnetsocket->inetsocket);
 577                                 }
 578                                 else
 579                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 580 #ifdef WIN32
 581                         }
 582                         else
 583                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 584 #endif
 585                         break;
 586                 default:
 587                         break;
 588                 }
 589                 Z_Free(lhnetsocket);
 590         }
 591         return NULL;
 592 }
 593
 594 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 595 {
 596         if (lhnetsocket)
 597         {
 598                 // unlink from socket list
 599                 if (lhnetsocket->next == NULL)
 600                         return; // invalid!
 601                 lhnetsocket->next->prev = lhnetsocket->prev;
 602                 lhnetsocket->prev->next = lhnetsocket->next;
 603                 lhnetsocket->next = NULL;
 604                 lhnetsocket->prev = NULL;
 605
 606                 // no special close code for loopback, just inet
 607                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 608                 {
 609                         closesocket(lhnetsocket->inetsocket);
 610                 }
 611                 Z_Free(lhnetsocket);
 612         }
 613 }
 614
 615 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 616 {
 617         if (sock)
 618                 return &sock->address;
 619         else
 620                 return NULL;
 621 }
 622
 623 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *address)
 624 {
 625         int value = 0;
 626         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 627                 return -1;
 628         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 629         {
 630                 time_t currenttime;
 631                 lhnetpacket_t *p, *pnext;
 632                 // scan for any old packets to timeout while searching for a packet
 633                 // that is waiting to be delivered to this socket
 634                 currenttime = time(NULL);
 635                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 636                 {
 637                         pnext = p->next;
 638                         if (p->timeout < currenttime)
 639                         {
 640                                 // unlink and free
 641                                 p->next->prev = p->prev;
 642                                 p->prev->next = p->next;
 643                                 Z_Free(p);
 644                                 continue;
 645                         }
 646 #ifndef STANDALONETEST
 647                         if (cl_netlocalping.value && (Sys_DoubleTime() - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 648                                 continue;
 649 #endif
 650                         if (value == 0 && p->destinationport == lhnetsocket->address.addressdata.loop.port)
 651                         {
 652                                 if (p->length <= maxcontentlength)
 653                                 {
 654                                         *address = lhnetsocket->address;
 655                                         address->addressdata.loop.port = p->sourceport;
 656                                         memcpy(content, p->data, p->length);
 657                                         value = p->length;
 658                                 }
 659                                 else
 660                                         value = -1;
 661                                 // unlink and free
 662                                 p->next->prev = p->prev;
 663                                 p->prev->next = p->next;
 664                                 Z_Free(p);
 665                         }
 666                 }
 667         }
 668         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 669         {
 670                 unsigned int inetaddresslength;
 671                 address->addresstype = LHNETADDRESSTYPE_NONE;
 672                 inetaddresslength = sizeof(address->addressdata.inet4);
 673                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet4, &inetaddresslength);
 674                 if (value > 0)
 675                 {
 676                         address->addresstype = LHNETADDRESSTYPE_INET4;
 677                         return value;
 678                 }
 679                 else if (value == -1)
 680                 {
 681                         int e = SOCKETERRNO;
 682                         if (e == EWOULDBLOCK)
 683                                 return 0;
 684                         switch (e)
 685                         {
 686                                 case ECONNREFUSED:
 687                                         Con_Print("Connection refused\n");
 688                                         return 0;
 689                         }
 690                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 691                 }
 692         }
 693         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 694         {
 695                 unsigned int inetaddresslength;
 696                 address->addresstype = LHNETADDRESSTYPE_NONE;
 697                 inetaddresslength = sizeof(address->addressdata.inet6);
 698                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet6, &inetaddresslength);
 699                 if (value > 0)
 700                 {
 701                         address->addresstype = LHNETADDRESSTYPE_INET6;
 702                         return value;
 703                 }
 704                 else if (value == -1)
 705                 {
 706                         int e = SOCKETERRNO;
 707                         if (e == EWOULDBLOCK)
 708                                 return 0;
 709                         switch (e)
 710                         {
 711                                 case ECONNREFUSED:
 712                                         Con_Print("Connection refused\n");
 713                                         return 0;
 714                         }
 715                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 716                 }
 717         }
 718         return value;
 719 }
 720
 721 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *address)
 722 {
 723         int value = -1;
 724         if (!lhnetsocket || !address || !content || contentlength < 1)
 725                 return -1;
 726         if (lhnetsocket->address.addresstype != address->addresstype)
 727                 return -1;
 728         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 729         {
 730                 lhnetpacket_t *p;
 731                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 732                 p->data = (void *)(p + 1);
 733                 memcpy(p->data, content, contentlength);
 734                 p->length = contentlength;
 735                 p->sourceport = lhnetsocket->address.addressdata.loop.port;
 736                 p->destinationport = address->addressdata.loop.port;
 737                 p->timeout = time(NULL) + 10;
 738                 p->next = &lhnet_packetlist;
 739                 p->prev = p->next->prev;
 740                 p->next->prev = p;
 741                 p->prev->next = p;
 742 #ifndef STANDALONETEST
 743                 p->sentdoubletime = Sys_DoubleTime();
 744 #endif
 745                 value = contentlength;
 746         }
 747         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 748         {
 749                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet4, sizeof(address->addressdata.inet4));
 750                 if (value == -1)
 751                 {
 752                         if (SOCKETERRNO == EWOULDBLOCK)
 753                                 return 0;
 754                         Con_Printf("LHNET_Read: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 755                 }
 756         }
 757         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 758         {
 759                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet6, sizeof(address->addressdata.inet6));
 760                 if (value == -1)
 761                 {
 762                         if (SOCKETERRNO == EWOULDBLOCK)
 763                                 return 0;
 764                         Con_Printf("LHNET_Read: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 765                 }
 766         }
 767         return value;
 768 }
 769
 770 #ifdef STANDALONETEST
 771 int main(int argc, char **argv)
 772 {
 773 #if 1
 774         char *buffer = "test", buffer2[1024];
 775         int blen = strlen(buffer);
 776         int b2len = 1024;
 777         lhnetsocket_t *sock1;
 778         lhnetsocket_t *sock2;
 779         lhnetaddress_t myaddy1;
 780         lhnetaddress_t myaddy2;
 781         lhnetaddress_t myaddy3;
 782         lhnetaddress_t localhostaddy1;
 783         lhnetaddress_t localhostaddy2;
 784         int test1;
 785         int test2;
 786
 787         printf("calling LHNET_Init\n");
 788         LHNET_Init();
 789
 790         printf("calling LHNET_FromPort twice to create two local addresses\n");
 791         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
 792         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
 793         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
 794         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
 795
 796         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
 797         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
 798         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
 799
 800         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
 801         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
 802         printf("sleeping briefly\n");
 803 #ifdef WIN32
 804         Sleep (100);
 805 #else
 806         usleep (100000);
 807 #endif
 808         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
 809         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
 810         if (test2 > 0)
 811                 Con_Printf("socket to socket test succeeded\n");
 812         else
 813                 Con_Printf("socket to socket test failed\n");
 814
 815 #ifdef WIN32
 816         printf("press any key to exit\n");
 817         getchar();
 818 #endif
 819
 820         printf("calling LHNET_Shutdown\n");
 821         LHNET_Shutdown();
 822         printf("exiting\n");
 823         return 0;
 824 #else
 825         lhnetsocket_t *sock[16], *sendsock;
 826         int i;
 827         int numsockets;
 828         int count;
 829         int length;
 830         int port;
 831         time_t oldtime;
 832         time_t newtime;
 833         char *sendmessage;
 834         int sendmessagelength;
 835         lhnetaddress_t destaddress;
 836         lhnetaddress_t receiveaddress;
 837         lhnetaddress_t sockaddress[16];
 838         char buffer[1536], addressstring[128], addressstring2[128];
 839         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 840         {
 841                 printf("calling LHNET_Init()\n");
 842                 LHNET_Init();
 843
 844                 numsockets = 0;
 845                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 846                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 847                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 848
 849                 sendsock = NULL;
 850                 sendmessage = NULL;
 851                 sendmessagelength = 0;
 852
 853                 for (i = 0;i < numsockets;i++)
 854                 {
 855                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 856                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 857                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 858                         {
 859                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 860                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 861                         }
 862                         else
 863                         {
 864                                 printf("failed to open socket\n");
 865                                 if (i == 0)
 866                                 {
 867                                         LHNET_Shutdown();
 868                                         return -1;
 869                                 }
 870                         }
 871                 }
 872                 count = 0;
 873                 if (argc == 5)
 874                 {
 875                         count = atoi(argv[2]);
 876                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 877                         {
 878                                 sendmessage = argv[4];
 879                                 sendmessagelength = strlen(sendmessage);
 880                                 sendsock = NULL;
 881                                 for (i = 0;i < numsockets;i++)
 882                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 883                                                 sendsock = sock[i];
 884                                 if (sendsock == NULL)
 885                                 {
 886                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 887                                         argc = 2;
 888                                 }
 889                         }
 890                         else
 891                         {
 892                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 893                                 argc = 2;
 894                         }
 895                 }
 896                 printf("started, now listening for \"exit\" on the opened sockets\n");
 897                 oldtime = time(NULL);
 898                 for(;;)
 899                 {
 900 #ifdef WIN32
 901                         Sleep(1);
 902 #else
 903                         usleep(1);
 904 #endif
 905                         for (i = 0;i < numsockets;i++)
 906                         {
 907                                 if (sock[i])
 908                                 {
 909                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 910                                         if (length < 0)
 911                                                 printf("localsock read error: length < 0");
 912                                         else if (length > 0 && length < (int)sizeof(buffer))
 913                                         {
 914                                                 buffer[length] = 0;
 915                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
 916                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 917                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
 918                                                 if (!strcmp(buffer, "exit"))
 919                                                         break;
 920                                         }
 921                                 }
 922                         }
 923                         if (i < numsockets)
 924                                 break;
 925                         if (argc == 5 && count > 0)
 926                         {
 927                                 newtime = time(NULL);
 928                                 if (newtime != oldtime)
 929                                 {
 930                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
 931                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
 932                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
 933                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
 934                                         if (length == sendmessagelength)
 935                                                 printf("sent successfully\n");
 936                                         else
 937                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
 938                                         oldtime = newtime;
 939                                         count--;
 940                                         if (count <= 0)
 941                                                 printf("Done sending, still listening for \"exit\"\n");
 942                                 }
 943                         }
 944                 }
 945                 for (i = 0;i < numsockets;i++)
 946                 {
 947                         if (sock[i])
 948                         {
 949                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 950                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
 951                                 LHNET_CloseSocket(sock[i]);
 952                         }
 953                 }
 954                 printf("calling LHNET_Shutdown()\n");
 955                 LHNET_Shutdown();
 956                 return 0;
 957         }
 958         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
 959         return -1;
 960 #endif
 961 }
 962 #endif
 963