lhnet.c

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