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 IOC_VENDOR 0x18000000
  46 #define _WSAIOW(x,y) (IOC_IN|(x)|(y))
  47 #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
  48
  49 #define SOCKLEN_T int
  50 #elif defined(__MORPHOS__)
  51 #define ioctlsocket IoctlSocket
  52 #define closesocket CloseSocket
  53 #define SOCKETERRNO Errno()
  54
  55 #define SOCKLEN_T int
  56 #else
  57 #define ioctlsocket ioctl
  58 #define closesocket close
  59 #define SOCKETERRNO errno
  60
  61 #define SOCKLEN_T socklen_t
  62 #endif
  63
  64 // to make LHNETADDRESS_FromString resolve repeated hostnames faster, cache them
  65 #define MAX_NAMECACHE 64
  66 static struct namecache_s
  67 {
  68         lhnetaddress_t address;
  69         double expirationtime;
  70         char name[64];
  71 }
  72 namecache[MAX_NAMECACHE];
  73 static int namecacheposition = 0;
  74
  75 int LHNETADDRESS_FromPort(lhnetaddress_t *address, int addresstype, int port)
  76 {
  77         if (!address)
  78                 return 0;
  79         switch(addresstype)
  80         {
  81         case LHNETADDRESSTYPE_LOOP:
  82                 // local:port  (loopback)
  83                 memset(address, 0, sizeof(*address));
  84                 address->addresstype = LHNETADDRESSTYPE_LOOP;
  85                 address->addressdata.loop.port = port;
  86                 return 1;
  87         case LHNETADDRESSTYPE_INET4:
  88                 // 0.0.0.0:port  (INADDR_ANY, binds to all interfaces)
  89                 memset(address, 0, sizeof(*address));
  90                 address->addresstype = LHNETADDRESSTYPE_INET4;
  91                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
  92                 address->addressdata.inet4.port = htons((unsigned short)port);
  93                 return 1;
  94         case LHNETADDRESSTYPE_INET6:
  95                 // [0:0:0:0:0:0:0:0]:port  (IN6ADDR_ANY, binds to all interfaces)
  96                 memset(address, 0, sizeof(*address));
  97                 address->addresstype = LHNETADDRESSTYPE_INET6;
  98                 address->addressdata.inet6.family = LHNETADDRESSTYPE_INET6_FAMILY;
  99                 address->addressdata.inet6.port = htons((unsigned short)port);
 100                 return 1;
 101         }
 102         return 0;
 103 }
 104
 105 int LHNETADDRESS_FromString(lhnetaddress_t *address, const char *string, int defaultport)
 106 {
 107         int i, port, namelen, d1, d2, d3, d4;
 108         struct hostent *hostentry;
 109         const char *colon;
 110         char name[128];
 111         if (!address || !string || !*string)
 112                 return 0;
 113         memset(address, 0, sizeof(*address));
 114         address->addresstype = LHNETADDRESSTYPE_NONE;
 115         port = 0;
 116         colon = strrchr(string, ':');
 117         if (colon)
 118                 port = atoi(colon + 1);
 119         else
 120                 colon = string + strlen(string);
 121         if (port == 0)
 122                 port = defaultport;
 123         namelen = colon - string;
 124         if (namelen > 127)
 125                 namelen = 127;
 126         if (string[0] == '[' && namelen > 0 && string[namelen-1] == ']') // ipv6
 127         {
 128                 string++;
 129                 namelen -= 2;
 130         }
 131         memcpy(name, string, namelen);
 132         name[namelen] = 0;
 133         // handle loopback
 134         if (!strcmp(name, "local"))
 135         {
 136                 address->addresstype = LHNETADDRESSTYPE_LOOP;
 137                 address->addressdata.loop.port = port;
 138                 return 1;
 139         }
 140         // try to parse as dotted decimal ipv4 address first
 141         // note this supports partial ip addresses
 142         d1 = d2 = d3 = d4 = 0;
 143         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)
 144         {
 145                 // parsed a valid ipv4 address
 146                 address->addresstype = LHNETADDRESSTYPE_INET4;
 147                 address->addressdata.inet4.family = LHNETADDRESSTYPE_INET4_FAMILY;
 148                 address->addressdata.inet4.port = htons((unsigned short)port);
 149                 address->addressdata.inet4.address[0] = (unsigned char)d1;
 150                 address->addressdata.inet4.address[1] = (unsigned char)d2;
 151                 address->addressdata.inet4.address[2] = (unsigned char)d3;
 152                 address->addressdata.inet4.address[3] = (unsigned char)d4;
 153 #ifdef STANDALONETEST
 154                 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));
 155 #endif
 156                 return 1;
 157         }
 158         for (i = 0;i < MAX_NAMECACHE;i++)
 159                 if (!strcmp(namecache[i].name, name))
 160                         break;
 161 #ifdef STANDALONETEST
 162         if (i < MAX_NAMECACHE)
 163 #else
 164         if (i < MAX_NAMECACHE && realtime < namecache[i].expirationtime)
 165 #endif
 166         {
 167                 *address = namecache[i].address;
 168                 if (address->addresstype == LHNETADDRESSTYPE_INET6)
 169                 {
 170                         address->addressdata.inet6.port = htons((unsigned short)port);
 171                         return 1;
 172                 }
 173                 else if (address->addresstype == LHNETADDRESSTYPE_INET4)
 174                 {
 175                         address->addressdata.inet4.port = htons((unsigned short)port);
 176                         return 1;
 177                 }
 178                 return 0;
 179         }
 180         // try gethostbyname (handles dns and other ip formats)
 181         hostentry = gethostbyname(name);
 182         if (hostentry)
 183         {
 184                 if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET6_FAMILY)
 185                 {
 186                         // great it worked
 187                         address->addresstype = LHNETADDRESSTYPE_INET6;
 188                         address->addressdata.inet6.family = hostentry->h_addrtype;
 189                         address->addressdata.inet6.port = htons((unsigned short)port);
 190                         memcpy(address->addressdata.inet6.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet6.address));
 191                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 192                                 namecache[namecacheposition].name[i] = name[i];
 193                         namecache[namecacheposition].name[i] = 0;
 194 #ifndef STANDALONETEST
 195                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 196 #endif
 197                         namecache[namecacheposition].address = *address;
 198                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 199 #ifdef STANDALONETEST
 200                         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));
 201 #endif
 202                         return 1;
 203                 }
 204                 else if (hostentry->h_addrtype == LHNETADDRESSTYPE_INET4_FAMILY)
 205                 {
 206                         // great it worked
 207                         address->addresstype = LHNETADDRESSTYPE_INET4;
 208                         address->addressdata.inet4.family = hostentry->h_addrtype;
 209                         address->addressdata.inet4.port = htons((unsigned short)port);
 210                         memcpy(address->addressdata.inet4.address, hostentry->h_addr_list[0], sizeof(address->addressdata.inet4.address));
 211                         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 212                                 namecache[namecacheposition].name[i] = name[i];
 213                         namecache[namecacheposition].name[i] = 0;
 214 #ifndef STANDALONETEST
 215                         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 216 #endif
 217                         namecache[namecacheposition].address = *address;
 218                         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 219 #ifdef STANDALONETEST
 220                         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));
 221 #endif
 222                         return 1;
 223                 }
 224         }
 225 #ifdef STANDALONETEST
 226         printf("gethostbyname failed on address \"%s\"\n", name);
 227 #endif
 228         for (i = 0;i < (int)sizeof(namecache[namecacheposition].name)-1 && name[i];i++)
 229                 namecache[namecacheposition].name[i] = name[i];
 230         namecache[namecacheposition].name[i] = 0;
 231 #ifndef STANDALONETEST
 232         namecache[namecacheposition].expirationtime = realtime + 12 * 3600; // 12 hours
 233 #endif
 234         namecache[namecacheposition].address.addresstype = LHNETADDRESSTYPE_NONE;
 235         namecacheposition = (namecacheposition + 1) % MAX_NAMECACHE;
 236         return 0;
 237 }
 238
 239 int LHNETADDRESS_ToString(const lhnetaddress_t *address, char *string, int stringbuffersize, int includeport)
 240 {
 241         *string = 0;
 242         if (!address || !string || stringbuffersize < 1)
 243                 return 0;
 244         switch(address->addresstype)
 245         {
 246         default:
 247                 break;
 248         case LHNETADDRESSTYPE_LOOP:
 249                 if (includeport)
 250                 {
 251                         if (stringbuffersize >= 12)
 252                         {
 253                                 sprintf(string, "local:%d", (int)address->addressdata.loop.port);
 254                                 return 1;
 255                         }
 256                 }
 257                 else
 258                 {
 259                         if (stringbuffersize >= 6)
 260                         {
 261                                 memcpy(string, "local", 6);
 262                                 return 1;
 263                         }
 264                 }
 265                 break;
 266         case LHNETADDRESSTYPE_INET4:
 267                 if (includeport)
 268                 {
 269                         if (stringbuffersize >= 22)
 270                         {
 271                                 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));
 272                                 return 1;
 273                         }
 274                 }
 275                 else
 276                 {
 277                         if (stringbuffersize >= 16)
 278                         {
 279                                 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]);
 280                                 return 1;
 281                         }
 282                 }
 283                 break;
 284         case LHNETADDRESSTYPE_INET6:
 285                 if (includeport)
 286                 {
 287                         if (stringbuffersize >= 88)
 288                         {
 289                                 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));
 290                                 return 1;
 291                         }
 292                 }
 293                 else
 294                 {
 295                         if (stringbuffersize >= 80)
 296                         {
 297                                 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]);
 298                                 return 1;
 299                         }
 300                 }
 301                 break;
 302         }
 303         return 0;
 304 }
 305
 306 int LHNETADDRESS_GetAddressType(const lhnetaddress_t *address)
 307 {
 308         if (address)
 309                 return address->addresstype;
 310         else
 311                 return LHNETADDRESSTYPE_NONE;
 312 }
 313
 314 int LHNETADDRESS_GetPort(const lhnetaddress_t *address)
 315 {
 316         if (!address)
 317                 return -1;
 318         switch(address->addresstype)
 319         {
 320         case LHNETADDRESSTYPE_LOOP:
 321                 return address->addressdata.loop.port;
 322         case LHNETADDRESSTYPE_INET4:
 323                 return ntohs(address->addressdata.inet4.port);
 324         case LHNETADDRESSTYPE_INET6:
 325                 return ntohs(address->addressdata.inet6.port);
 326         default:
 327                 return -1;
 328         }
 329 }
 330
 331 int LHNETADDRESS_SetPort(lhnetaddress_t *address, int port)
 332 {
 333         if (!address)
 334                 return 0;
 335         switch(address->addresstype)
 336         {
 337         case LHNETADDRESSTYPE_LOOP:
 338                 address->addressdata.loop.port = port;
 339                 return 1;
 340         case LHNETADDRESSTYPE_INET4:
 341                 address->addressdata.inet4.port = htons((unsigned short)port);
 342                 return 1;
 343         case LHNETADDRESSTYPE_INET6:
 344                 address->addressdata.inet6.port = htons((unsigned short)port);
 345                 return 1;
 346         default:
 347                 return 0;
 348         }
 349 }
 350
 351 int LHNETADDRESS_Compare(const lhnetaddress_t *address1, const lhnetaddress_t *address2)
 352 {
 353         if (!address1 || !address2)
 354                 return 1;
 355         if (address1->addresstype != address2->addresstype)
 356                 return 1;
 357         switch(address1->addresstype)
 358         {
 359         case LHNETADDRESSTYPE_LOOP:
 360                 if (address1->addressdata.loop.port != address2->addressdata.loop.port)
 361                         return -1;
 362                 return 0;
 363         case LHNETADDRESSTYPE_INET4:
 364                 if (address1->addressdata.inet4.family != address2->addressdata.inet4.family)
 365                         return 1;
 366                 if (memcmp(address1->addressdata.inet4.address, address2->addressdata.inet4.address, sizeof(address1->addressdata.inet4.address)))
 367                         return 1;
 368                 if (address1->addressdata.inet4.port != address2->addressdata.inet4.port)
 369                         return -1;
 370                 return 0;
 371         case LHNETADDRESSTYPE_INET6:
 372                 if (address1->addressdata.inet6.family != address2->addressdata.inet6.family)
 373                         return 1;
 374                 if (memcmp(address1->addressdata.inet6.address, address2->addressdata.inet6.address, sizeof(address1->addressdata.inet6.address)))
 375                         return 1;
 376                 if (address1->addressdata.inet6.port != address2->addressdata.inet6.port)
 377                         return -1;
 378                 return 0;
 379         default:
 380                 return 1;
 381         }
 382 }
 383
 384 typedef struct lhnetpacket_s
 385 {
 386         void *data;
 387         int length;
 388         int sourceport;
 389         int destinationport;
 390         time_t timeout;
 391 #ifndef STANDALONETEST
 392         double sentdoubletime;
 393 #endif
 394         struct lhnetpacket_s *next, *prev;
 395 }
 396 lhnetpacket_t;
 397
 398 static int lhnet_active;
 399 static lhnetsocket_t lhnet_socketlist;
 400 static lhnetpacket_t lhnet_packetlist;
 401 #ifdef WIN32
 402 static int lhnet_didWSAStartup = 0;
 403 static WSADATA lhnet_winsockdata;
 404 #endif
 405
 406 void LHNET_Init(void)
 407 {
 408         if (lhnet_active)
 409                 return;
 410         lhnet_socketlist.next = lhnet_socketlist.prev = &lhnet_socketlist;
 411         lhnet_packetlist.next = lhnet_packetlist.prev = &lhnet_packetlist;
 412         lhnet_active = 1;
 413 #ifdef WIN32
 414         lhnet_didWSAStartup = !WSAStartup(MAKEWORD(1, 1), &lhnet_winsockdata);
 415         if (!lhnet_didWSAStartup)
 416                 Con_Print("LHNET_Init: WSAStartup failed, networking disabled\n");
 417 #endif
 418 }
 419
 420 void LHNET_Shutdown(void)
 421 {
 422         lhnetpacket_t *p;
 423         if (!lhnet_active)
 424                 return;
 425         while (lhnet_socketlist.next != &lhnet_socketlist)
 426                 LHNET_CloseSocket(lhnet_socketlist.next);
 427         while (lhnet_packetlist.next != &lhnet_packetlist)
 428         {
 429                 p = lhnet_packetlist.next;
 430                 p->prev->next = p->next;
 431                 p->next->prev = p->prev;
 432                 Z_Free(p);
 433         }
 434 #ifdef WIN32
 435         if (lhnet_didWSAStartup)
 436         {
 437                 lhnet_didWSAStartup = 0;
 438                 WSACleanup();
 439         }
 440 #endif
 441         lhnet_active = 0;
 442 }
 443
 444 static const char *LHNETPRIVATE_StrError(void)
 445 {
 446 #ifdef WIN32
 447         int i = WSAGetLastError();
 448         switch (i)
 449         {
 450                 case WSAEINTR:           return "WSAEINTR";
 451                 case WSAEBADF:           return "WSAEBADF";
 452                 case WSAEACCES:          return "WSAEACCES";
 453                 case WSAEFAULT:          return "WSAEFAULT";
 454                 case WSAEINVAL:          return "WSAEINVAL";
 455                 case WSAEMFILE:          return "WSAEMFILE";
 456                 case WSAEWOULDBLOCK:     return "WSAEWOULDBLOCK";
 457                 case WSAEINPROGRESS:     return "WSAEINPROGRESS";
 458                 case WSAEALREADY:        return "WSAEALREADY";
 459                 case WSAENOTSOCK:        return "WSAENOTSOCK";
 460                 case WSAEDESTADDRREQ:    return "WSAEDESTADDRREQ";
 461                 case WSAEMSGSIZE:        return "WSAEMSGSIZE";
 462                 case WSAEPROTOTYPE:      return "WSAEPROTOTYPE";
 463                 case WSAENOPROTOOPT:     return "WSAENOPROTOOPT";
 464                 case WSAEPROTONOSUPPORT: return "WSAEPROTONOSUPPORT";
 465                 case WSAESOCKTNOSUPPORT: return "WSAESOCKTNOSUPPORT";
 466                 case WSAEOPNOTSUPP:      return "WSAEOPNOTSUPP";
 467                 case WSAEPFNOSUPPORT:    return "WSAEPFNOSUPPORT";
 468                 case WSAEAFNOSUPPORT:    return "WSAEAFNOSUPPORT";
 469                 case WSAEADDRINUSE:      return "WSAEADDRINUSE";
 470                 case WSAEADDRNOTAVAIL:   return "WSAEADDRNOTAVAIL";
 471                 case WSAENETDOWN:        return "WSAENETDOWN";
 472                 case WSAENETUNREACH:     return "WSAENETUNREACH";
 473                 case WSAENETRESET:       return "WSAENETRESET";
 474                 case WSAECONNABORTED:    return "WSAECONNABORTED";
 475                 case WSAECONNRESET:      return "WSAECONNRESET";
 476                 case WSAENOBUFS:         return "WSAENOBUFS";
 477                 case WSAEISCONN:         return "WSAEISCONN";
 478                 case WSAENOTCONN:        return "WSAENOTCONN";
 479                 case WSAESHUTDOWN:       return "WSAESHUTDOWN";
 480                 case WSAETOOMANYREFS:    return "WSAETOOMANYREFS";
 481                 case WSAETIMEDOUT:       return "WSAETIMEDOUT";
 482                 case WSAECONNREFUSED:    return "WSAECONNREFUSED";
 483                 case WSAELOOP:           return "WSAELOOP";
 484                 case WSAENAMETOOLONG:    return "WSAENAMETOOLONG";
 485                 case WSAEHOSTDOWN:       return "WSAEHOSTDOWN";
 486                 case WSAEHOSTUNREACH:    return "WSAEHOSTUNREACH";
 487                 case WSAENOTEMPTY:       return "WSAENOTEMPTY";
 488                 case WSAEPROCLIM:        return "WSAEPROCLIM";
 489                 case WSAEUSERS:          return "WSAEUSERS";
 490                 case WSAEDQUOT:          return "WSAEDQUOT";
 491                 case WSAESTALE:          return "WSAESTALE";
 492                 case WSAEREMOTE:         return "WSAEREMOTE";
 493                 case WSAEDISCON:         return "WSAEDISCON";
 494                 case 0:                  return "no error";
 495                 default:                 return "unknown WSAE error";
 496         }
 497 #else
 498         return strerror(errno);
 499 #endif
 500 }
 501
 502 void LHNET_SleepUntilPacket_Microseconds(int microseconds)
 503 {
 504         fd_set fdreadset;
 505         struct timeval tv;
 506         int lastfd;
 507         lhnetsocket_t *s;
 508         FD_ZERO(&fdreadset);
 509         lastfd = 0;
 510         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 511         {
 512                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 513                 {
 514                         if (lastfd < s->inetsocket)
 515                                 lastfd = s->inetsocket;
 516                         FD_SET(s->inetsocket, &fdreadset);
 517                 }
 518         }
 519         tv.tv_sec = microseconds / 1000000;
 520         tv.tv_usec = microseconds % 1000000;
 521         select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 522 }
 523
 524 lhnetsocket_t *LHNET_OpenSocket_Connectionless(lhnetaddress_t *address)
 525 {
 526         lhnetsocket_t *lhnetsocket, *s;
 527         if (!address)
 528                 return NULL;
 529         lhnetsocket = (lhnetsocket_t *)Z_Malloc(sizeof(*lhnetsocket));
 530         if (lhnetsocket)
 531         {
 532                 memset(lhnetsocket, 0, sizeof(*lhnetsocket));
 533                 lhnetsocket->address = *address;
 534                 switch(lhnetsocket->address.addresstype)
 535                 {
 536                 case LHNETADDRESSTYPE_LOOP:
 537                         if (lhnetsocket->address.addressdata.loop.port == 0)
 538                         {
 539                                 // allocate a port dynamically
 540                                 // this search will always terminate because there is never
 541                                 // an allocated socket with port 0, so if the number wraps it
 542                                 // will find the port is unused, and then refuse to use port
 543                                 // 0, causing an intentional failure condition
 544                                 lhnetsocket->address.addressdata.loop.port = 1024;
 545                                 for (;;)
 546                                 {
 547                                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 548                                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 549                                                         break;
 550                                         if (s == &lhnet_socketlist)
 551                                                 break;
 552                                         lhnetsocket->address.addressdata.loop.port++;
 553                                 }
 554                         }
 555                         // check if the port is available
 556                         for (s = lhnet_socketlist.next;s != &lhnet_socketlist;s = s->next)
 557                                 if (s->address.addresstype == lhnetsocket->address.addresstype && s->address.addressdata.loop.port == lhnetsocket->address.addressdata.loop.port)
 558                                         break;
 559                         if (s == &lhnet_socketlist && lhnetsocket->address.addressdata.loop.port != 0)
 560                         {
 561                                 lhnetsocket->next = &lhnet_socketlist;
 562                                 lhnetsocket->prev = lhnetsocket->next->prev;
 563                                 lhnetsocket->next->prev = lhnetsocket;
 564                                 lhnetsocket->prev->next = lhnetsocket;
 565                                 return lhnetsocket;
 566                         }
 567                         break;
 568                 case LHNETADDRESSTYPE_INET4:
 569                 case LHNETADDRESSTYPE_INET6:
 570 #ifdef WIN32
 571                         if (lhnet_didWSAStartup)
 572                         {
 573 #endif
 574                                 if ((lhnetsocket->inetsocket = socket(address->addresstype == LHNETADDRESSTYPE_INET6 ? LHNETADDRESSTYPE_INET6_FAMILY : LHNETADDRESSTYPE_INET4_FAMILY, SOCK_DGRAM, IPPROTO_UDP)) != -1)
 575                                 {
 576 #ifdef WIN32
 577                                         u_long _true = 1;
 578                                         u_long _false = 0;
 579 #else
 580                                         char _true = 1;
 581 #endif
 582                                         if (ioctlsocket(lhnetsocket->inetsocket, FIONBIO, &_true) != -1)
 583                                         {
 584                                                 SOCKLEN_T namelen;
 585                                                 namelen = address->addresstype == LHNETADDRESSTYPE_INET6 ? sizeof(lhnetsocket->address.addressdata.inet6) : sizeof(lhnetsocket->address.addressdata.inet4);
 586                                                 if (bind(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, namelen) != -1)
 587                                                 {
 588                                                         int i = 1;
 589                                                         getsockname(lhnetsocket->inetsocket, (struct sockaddr *)&lhnetsocket->address.addressdata, &namelen);
 590                                                         // enable broadcast on this socket
 591                                                         setsockopt(lhnetsocket->inetsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i));
 592                                                         lhnetsocket->next = &lhnet_socketlist;
 593                                                         lhnetsocket->prev = lhnetsocket->next->prev;
 594                                                         lhnetsocket->next->prev = lhnetsocket;
 595                                                         lhnetsocket->prev->next = lhnetsocket;
 596 #ifdef WIN32
 597                                                         if (ioctlsocket(lhnetsocket->inetsocket, SIO_UDP_CONNRESET, &_false) == -1)
 598                                                                 Con_DPrintf("LHNET_OpenSocket_Connectionless: ioctlsocket SIO_UDP_CONNRESET returned error: %s\n", LHNETPRIVATE_StrError());
 599 #endif
 600                                                         return lhnetsocket;
 601                                                 }
 602                                                 else
 603                                                         Con_Printf("LHNET_OpenSocket_Connectionless: bind returned error: %s\n", LHNETPRIVATE_StrError());
 604                                         }
 605                                         else
 606                                                 Con_Printf("LHNET_OpenSocket_Connectionless: ioctlsocket returned error: %s\n", LHNETPRIVATE_StrError());
 607                                         closesocket(lhnetsocket->inetsocket);
 608                                 }
 609                                 else
 610                                         Con_Printf("LHNET_OpenSocket_Connectionless: socket returned error: %s\n", LHNETPRIVATE_StrError());
 611 #ifdef WIN32
 612                         }
 613                         else
 614                                 Con_Print("LHNET_OpenSocket_Connectionless: can't open a socket (WSAStartup failed during LHNET_Init)\n");
 615 #endif
 616                         break;
 617                 default:
 618                         break;
 619                 }
 620                 Z_Free(lhnetsocket);
 621         }
 622         return NULL;
 623 }
 624
 625 void LHNET_CloseSocket(lhnetsocket_t *lhnetsocket)
 626 {
 627         if (lhnetsocket)
 628         {
 629                 // unlink from socket list
 630                 if (lhnetsocket->next == NULL)
 631                         return; // invalid!
 632                 lhnetsocket->next->prev = lhnetsocket->prev;
 633                 lhnetsocket->prev->next = lhnetsocket->next;
 634                 lhnetsocket->next = NULL;
 635                 lhnetsocket->prev = NULL;
 636
 637                 // no special close code for loopback, just inet
 638                 if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4 || lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 639                 {
 640                         closesocket(lhnetsocket->inetsocket);
 641                 }
 642                 Z_Free(lhnetsocket);
 643         }
 644 }
 645
 646 lhnetaddress_t *LHNET_AddressFromSocket(lhnetsocket_t *sock)
 647 {
 648         if (sock)
 649                 return &sock->address;
 650         else
 651                 return NULL;
 652 }
 653
 654 int LHNET_Read(lhnetsocket_t *lhnetsocket, void *content, int maxcontentlength, lhnetaddress_t *address)
 655 {
 656         int value = 0;
 657         if (!lhnetsocket || !address || !content || maxcontentlength < 1)
 658                 return -1;
 659         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 660         {
 661                 time_t currenttime;
 662                 lhnetpacket_t *p, *pnext;
 663                 // scan for any old packets to timeout while searching for a packet
 664                 // that is waiting to be delivered to this socket
 665                 currenttime = time(NULL);
 666                 for (p = lhnet_packetlist.next;p != &lhnet_packetlist;p = pnext)
 667                 {
 668                         pnext = p->next;
 669                         if (p->timeout < currenttime)
 670                         {
 671                                 // unlink and free
 672                                 p->next->prev = p->prev;
 673                                 p->prev->next = p->next;
 674                                 Z_Free(p);
 675                                 continue;
 676                         }
 677 #ifndef STANDALONETEST
 678                         if (cl_netlocalping.value && (realtime - cl_netlocalping.value * (1.0 / 2000.0)) < p->sentdoubletime)
 679                                 continue;
 680 #endif
 681                         if (value == 0 && p->destinationport == lhnetsocket->address.addressdata.loop.port)
 682                         {
 683                                 if (p->length <= maxcontentlength)
 684                                 {
 685                                         *address = lhnetsocket->address;
 686                                         address->addressdata.loop.port = p->sourceport;
 687                                         memcpy(content, p->data, p->length);
 688                                         value = p->length;
 689                                 }
 690                                 else
 691                                         value = -1;
 692                                 // unlink and free
 693                                 p->next->prev = p->prev;
 694                                 p->prev->next = p->next;
 695                                 Z_Free(p);
 696                         }
 697                 }
 698         }
 699         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 700         {
 701                 unsigned int inetaddresslength;
 702                 address->addresstype = LHNETADDRESSTYPE_NONE;
 703                 inetaddresslength = sizeof(address->addressdata.inet4);
 704                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet4, &inetaddresslength);
 705                 if (value > 0)
 706                 {
 707                         address->addresstype = LHNETADDRESSTYPE_INET4;
 708                         return value;
 709                 }
 710                 else if (value == -1)
 711                 {
 712                         int e = SOCKETERRNO;
 713                         if (e == EWOULDBLOCK)
 714                                 return 0;
 715                         switch (e)
 716                         {
 717                                 case ECONNREFUSED:
 718                                         Con_Print("Connection refused\n");
 719                                         return 0;
 720                         }
 721                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 722                 }
 723         }
 724         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 725         {
 726                 unsigned int inetaddresslength;
 727                 address->addresstype = LHNETADDRESSTYPE_NONE;
 728                 inetaddresslength = sizeof(address->addressdata.inet6);
 729                 value = recvfrom(lhnetsocket->inetsocket, content, maxcontentlength, 0, (struct sockaddr *)&address->addressdata.inet6, &inetaddresslength);
 730                 if (value > 0)
 731                 {
 732                         address->addresstype = LHNETADDRESSTYPE_INET6;
 733                         return value;
 734                 }
 735                 else if (value == -1)
 736                 {
 737                         int e = SOCKETERRNO;
 738                         if (e == EWOULDBLOCK)
 739                                 return 0;
 740                         switch (e)
 741                         {
 742                                 case ECONNREFUSED:
 743                                         Con_Print("Connection refused\n");
 744                                         return 0;
 745                         }
 746                         Con_Printf("LHNET_Read: recvfrom returned error: %s\n", LHNETPRIVATE_StrError());
 747                 }
 748         }
 749         return value;
 750 }
 751
 752 int LHNET_Write(lhnetsocket_t *lhnetsocket, const void *content, int contentlength, const lhnetaddress_t *address)
 753 {
 754         int value = -1;
 755         if (!lhnetsocket || !address || !content || contentlength < 1)
 756                 return -1;
 757         if (lhnetsocket->address.addresstype != address->addresstype)
 758                 return -1;
 759         if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_LOOP)
 760         {
 761                 lhnetpacket_t *p;
 762                 p = (lhnetpacket_t *)Z_Malloc(sizeof(*p) + contentlength);
 763                 p->data = (void *)(p + 1);
 764                 memcpy(p->data, content, contentlength);
 765                 p->length = contentlength;
 766                 p->sourceport = lhnetsocket->address.addressdata.loop.port;
 767                 p->destinationport = address->addressdata.loop.port;
 768                 p->timeout = time(NULL) + 10;
 769                 p->next = &lhnet_packetlist;
 770                 p->prev = p->next->prev;
 771                 p->next->prev = p;
 772                 p->prev->next = p;
 773 #ifndef STANDALONETEST
 774                 p->sentdoubletime = realtime;
 775 #endif
 776                 value = contentlength;
 777         }
 778         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET4)
 779         {
 780                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet4, sizeof(address->addressdata.inet4));
 781                 if (value == -1)
 782                 {
 783                         if (SOCKETERRNO == EWOULDBLOCK)
 784                                 return 0;
 785                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 786                 }
 787         }
 788         else if (lhnetsocket->address.addresstype == LHNETADDRESSTYPE_INET6)
 789         {
 790                 value = sendto(lhnetsocket->inetsocket, content, contentlength, 0, (struct sockaddr *)&address->addressdata.inet6, sizeof(address->addressdata.inet6));
 791                 if (value == -1)
 792                 {
 793                         if (SOCKETERRNO == EWOULDBLOCK)
 794                                 return 0;
 795                         Con_Printf("LHNET_Write: sendto returned error: %s\n", LHNETPRIVATE_StrError());
 796                 }
 797         }
 798         return value;
 799 }
 800
 801 #ifdef STANDALONETEST
 802 int main(int argc, char **argv)
 803 {
 804 #if 1
 805         char *buffer = "test", buffer2[1024];
 806         int blen = strlen(buffer);
 807         int b2len = 1024;
 808         lhnetsocket_t *sock1;
 809         lhnetsocket_t *sock2;
 810         lhnetaddress_t myaddy1;
 811         lhnetaddress_t myaddy2;
 812         lhnetaddress_t myaddy3;
 813         lhnetaddress_t localhostaddy1;
 814         lhnetaddress_t localhostaddy2;
 815         int test1;
 816         int test2;
 817
 818         printf("calling LHNET_Init\n");
 819         LHNET_Init();
 820
 821         printf("calling LHNET_FromPort twice to create two local addresses\n");
 822         LHNETADDRESS_FromPort(&myaddy1, LHNETADDRESSTYPE_INET4, 4000);
 823         LHNETADDRESS_FromPort(&myaddy2, LHNETADDRESSTYPE_INET4, 4001);
 824         LHNETADDRESS_FromString(&localhostaddy1, "127.0.0.1", 4000);
 825         LHNETADDRESS_FromString(&localhostaddy2, "127.0.0.1", 4001);
 826
 827         printf("calling LHNET_OpenSocket_Connectionless twice to create two local sockets\n");
 828         sock1 = LHNET_OpenSocket_Connectionless(&myaddy1);
 829         sock2 = LHNET_OpenSocket_Connectionless(&myaddy2);
 830
 831         printf("calling LHNET_Write to send a packet from the first socket to the second socket\n");
 832         test1 = LHNET_Write(sock1, buffer, blen, &localhostaddy2);
 833         printf("sleeping briefly\n");
 834 #ifdef WIN32
 835         Sleep (100);
 836 #else
 837         usleep (100000);
 838 #endif
 839         printf("calling LHNET_Read on the second socket to read the packet sent from the first socket\n");
 840         test2 = LHNET_Read(sock2, buffer2, b2len - 1, &myaddy3);
 841         if (test2 > 0)
 842                 Con_Printf("socket to socket test succeeded\n");
 843         else
 844                 Con_Printf("socket to socket test failed\n");
 845
 846 #ifdef WIN32
 847         printf("press any key to exit\n");
 848         getchar();
 849 #endif
 850
 851         printf("calling LHNET_Shutdown\n");
 852         LHNET_Shutdown();
 853         printf("exiting\n");
 854         return 0;
 855 #else
 856         lhnetsocket_t *sock[16], *sendsock;
 857         int i;
 858         int numsockets;
 859         int count;
 860         int length;
 861         int port;
 862         time_t oldtime;
 863         time_t newtime;
 864         char *sendmessage;
 865         int sendmessagelength;
 866         lhnetaddress_t destaddress;
 867         lhnetaddress_t receiveaddress;
 868         lhnetaddress_t sockaddress[16];
 869         char buffer[1536], addressstring[128], addressstring2[128];
 870         if ((argc == 2 || argc == 5) && (port = atoi(argv[1])) >= 1 && port < 65535)
 871         {
 872                 printf("calling LHNET_Init()\n");
 873                 LHNET_Init();
 874
 875                 numsockets = 0;
 876                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_LOOP, port);
 877                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET4, port);
 878                 LHNETADDRESS_FromPort(&sockaddress[numsockets++], LHNETADDRESSTYPE_INET6, port+1);
 879
 880                 sendsock = NULL;
 881                 sendmessage = NULL;
 882                 sendmessagelength = 0;
 883
 884                 for (i = 0;i < numsockets;i++)
 885                 {
 886                         LHNETADDRESS_ToString(&sockaddress[i], addressstring, sizeof(addressstring), 1);
 887                         printf("calling LHNET_OpenSocket_Connectionless(<%s>)\n", addressstring);
 888                         if ((sock[i] = LHNET_OpenSocket_Connectionless(&sockaddress[i])))
 889                         {
 890                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 891                                 printf("opened socket successfully (address \"%s\")\n", addressstring2);
 892                         }
 893                         else
 894                         {
 895                                 printf("failed to open socket\n");
 896                                 if (i == 0)
 897                                 {
 898                                         LHNET_Shutdown();
 899                                         return -1;
 900                                 }
 901                         }
 902                 }
 903                 count = 0;
 904                 if (argc == 5)
 905                 {
 906                         count = atoi(argv[2]);
 907                         if (LHNETADDRESS_FromString(&destaddress, argv[3], -1))
 908                         {
 909                                 sendmessage = argv[4];
 910                                 sendmessagelength = strlen(sendmessage);
 911                                 sendsock = NULL;
 912                                 for (i = 0;i < numsockets;i++)
 913                                         if (sock[i] && LHNETADDRESS_GetAddressType(&destaddress) == LHNETADDRESS_GetAddressType(&sockaddress[i]))
 914                                                 sendsock = sock[i];
 915                                 if (sendsock == NULL)
 916                                 {
 917                                         printf("Could not find an open socket matching the addresstype (%i) of destination address, switching to listen only mode\n", LHNETADDRESS_GetAddressType(&destaddress));
 918                                         argc = 2;
 919                                 }
 920                         }
 921                         else
 922                         {
 923                                 printf("LHNETADDRESS_FromString did not like the address \"%s\", switching to listen only mode\n", argv[3]);
 924                                 argc = 2;
 925                         }
 926                 }
 927                 printf("started, now listening for \"exit\" on the opened sockets\n");
 928                 oldtime = time(NULL);
 929                 for(;;)
 930                 {
 931 #ifdef WIN32
 932                         Sleep(1);
 933 #else
 934                         usleep(1);
 935 #endif
 936                         for (i = 0;i < numsockets;i++)
 937                         {
 938                                 if (sock[i])
 939                                 {
 940                                         length = LHNET_Read(sock[i], buffer, sizeof(buffer), &receiveaddress);
 941                                         if (length < 0)
 942                                                 printf("localsock read error: length < 0");
 943                                         else if (length > 0 && length < (int)sizeof(buffer))
 944                                         {
 945                                                 buffer[length] = 0;
 946                                                 LHNETADDRESS_ToString(&receiveaddress, addressstring, sizeof(addressstring), 1);
 947                                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 948                                                 printf("received message \"%s\" from \"%s\" on socket \"%s\"\n", buffer, addressstring, addressstring2);
 949                                                 if (!strcmp(buffer, "exit"))
 950                                                         break;
 951                                         }
 952                                 }
 953                         }
 954                         if (i < numsockets)
 955                                 break;
 956                         if (argc == 5 && count > 0)
 957                         {
 958                                 newtime = time(NULL);
 959                                 if (newtime != oldtime)
 960                                 {
 961                                         LHNETADDRESS_ToString(&destaddress, addressstring, sizeof(addressstring), 1);
 962                                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(sendsock), addressstring2, sizeof(addressstring2), 1);
 963                                         printf("calling LHNET_Write(<%s>, \"%s\", %i, <%s>)\n", addressstring2, sendmessage, sendmessagelength, addressstring);
 964                                         length = LHNET_Write(sendsock, sendmessage, sendmessagelength, &destaddress);
 965                                         if (length == sendmessagelength)
 966                                                 printf("sent successfully\n");
 967                                         else
 968                                                 printf("LH_Write failed, returned %i (length of message was %i)\n", length, strlen(argv[4]));
 969                                         oldtime = newtime;
 970                                         count--;
 971                                         if (count <= 0)
 972                                                 printf("Done sending, still listening for \"exit\"\n");
 973                                 }
 974                         }
 975                 }
 976                 for (i = 0;i < numsockets;i++)
 977                 {
 978                         if (sock[i])
 979                         {
 980                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(sock[i]), addressstring2, sizeof(addressstring2), 1);
 981                                 printf("calling LHNET_CloseSocket(<%s>)\n", addressstring2);
 982                                 LHNET_CloseSocket(sock[i]);
 983                         }
 984                 }
 985                 printf("calling LHNET_Shutdown()\n");
 986                 LHNET_Shutdown();
 987                 return 0;
 988         }
 989         printf("Testing code for lhnet.c\nusage: lhnettest <localportnumber> [<sendnumberoftimes> <sendaddress:port> <sendmessage>]\n");
 990         return -1;
 991 #endif
 992 }
 993 #endif
 994