apps/s_socket.c

   1 /* apps/s_socket.c -  socket-related functions used by s_client and s_server */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <errno.h>
  63 #include <signal.h>
  64
  65 /* With IPv6, it looks like Digital has mixed up the proper order of
  66    recursive header file inclusion, resulting in the compiler complaining
  67    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
  68    is needed to have fileno() declared correctly...  So let's define u_int */
  69 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
  70 #define __U_INT
  71 typedef unsigned int u_int;
  72 #endif
  73
  74 #define USE_SOCKETS
  75 #define NON_MAIN
  76 #include "apps.h"
  77 #undef USE_SOCKETS
  78 #undef NON_MAIN
  79 #include "s_apps.h"
  80 #include <openssl/ssl.h>
  81
  82 #ifdef FLAT_INC
  83 #include "e_os.h"
  84 #else
  85 #include "../e_os.h"
  86 #endif
  87
  88 #ifndef OPENSSL_NO_SOCK
  89
  90 #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
  91 #include "netdb.h"
  92 #endif
  93
  94 static struct hostent *GetHostByName(const char *name);
  95 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
  96 static void ssl_sock_cleanup(void);
  97 #endif
  98 static int ssl_sock_init(void);
  99 static int init_client_ip(int *sock, const unsigned char ip[4], int port,
 100                           int type);
 101 static int init_server(int *sock, int port, int type);
 102 static int init_server_long(int *sock, int port,char *ip, int type);
 103 static int do_accept(int acc_sock, int *sock, char **host);
 104 static int host_ip(const char *str, unsigned char ip[4]);
 105 #ifndef NO_SYS_UN_H
 106 static int init_server_unix(int *sock, const char *path);
 107 static int do_accept_unix(int acc_sock, int *sock);
 108 #endif
 109
 110 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 111 static int wsa_init_done=0;
 112 #endif
 113
 114 #ifdef OPENSSL_SYS_WINDOWS
 115 static struct WSAData wsa_state;
 116 static int wsa_init_done=0;
 117
 118 #endif /* OPENSSL_SYS_WINDOWS */
 119
 120 #ifdef OPENSSL_SYS_WINDOWS
 121 static void ssl_sock_cleanup(void)
 122         {
 123         if (wsa_init_done)
 124                 {
 125                 wsa_init_done=0;
 126 #ifndef OPENSSL_SYS_WINCE
 127                 WSACancelBlockingCall();
 128 #endif
 129                 WSACleanup();
 130                 }
 131         }
 132 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 133 static void sock_cleanup(void)
 134     {
 135     if (wsa_init_done)
 136         {
 137         wsa_init_done=0;
 138                 WSACleanup();
 139                 }
 140         }
 141 #endif
 142
 143 static int ssl_sock_init(void)
 144         {
 145 #ifdef WATT32
 146         extern int _watt_do_exit;
 147         _watt_do_exit = 0;
 148         if (sock_init())
 149                 return (0);
 150 #elif defined(OPENSSL_SYS_WINDOWS)
 151         if (!wsa_init_done)
 152                 {
 153                 int err;
 154
 155 #ifdef SIGINT
 156                 signal(SIGINT,(void (*)(int))ssl_sock_cleanup);
 157 #endif
 158                 wsa_init_done=1;
 159                 memset(&wsa_state,0,sizeof(wsa_state));
 160                 if (WSAStartup(0x0101,&wsa_state)!=0)
 161                         {
 162                         err=WSAGetLastError();
 163                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
 164                         return(0);
 165                         }
 166                 }
 167 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 168    WORD wVerReq;
 169    WSADATA wsaData;
 170    int err;
 171
 172    if (!wsa_init_done)
 173       {
 174
 175 # ifdef SIGINT
 176       signal(SIGINT,(void (*)(int))sock_cleanup);
 177 # endif
 178
 179       wsa_init_done=1;
 180       wVerReq = MAKEWORD( 2, 0 );
 181       err = WSAStartup(wVerReq,&wsaData);
 182       if (err != 0)
 183          {
 184          BIO_printf(bio_err,"unable to start WINSOCK2, error code=%d\n",err);
 185          return(0);
 186          }
 187       }
 188 #endif /* OPENSSL_SYS_WINDOWS */
 189         return(1);
 190         }
 191
 192 int init_client(int *sock, const char *host, int port, int type)
 193         {
 194         unsigned char ip[4];
 195
 196         ip[0] = ip[1] = ip[2] = ip[3] = 0;
 197         if (!host_ip(host,&(ip[0])))
 198                 return 0;
 199         return init_client_ip(sock,ip,port,type);
 200         }
 201
 202 static int init_client_ip(int *sock, const unsigned char ip[4], int port,
 203                           int type)
 204         {
 205         unsigned long addr;
 206         struct sockaddr_in them;
 207         int s,i;
 208
 209         if (!ssl_sock_init()) return(0);
 210
 211         memset((char *)&them,0,sizeof(them));
 212         them.sin_family=AF_INET;
 213         them.sin_port=htons((unsigned short)port);
 214         addr=(unsigned long)
 215                 ((unsigned long)ip[0]<<24L)|
 216                 ((unsigned long)ip[1]<<16L)|
 217                 ((unsigned long)ip[2]<< 8L)|
 218                 ((unsigned long)ip[3]);
 219         them.sin_addr.s_addr=htonl(addr);
 220
 221         if (type == SOCK_STREAM)
 222                 s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
 223         else /* ( type == SOCK_DGRAM) */
 224                 s=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 225
 226         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 227
 228 #if defined(SO_KEEPALIVE)
 229         if (type == SOCK_STREAM)
 230                 {
 231                 i=0;
 232                 i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 233                 if (i < 0) { closesocket(s); perror("keepalive"); return(0); }
 234                 }
 235 #endif
 236
 237         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
 238                 { closesocket(s); perror("connect"); return(0); }
 239         *sock=s;
 240         return(1);
 241         }
 242
 243 #ifndef NO_SYS_UN_H
 244 int init_client_unix(int *sock, const char *server)
 245         {
 246         struct sockaddr_un them;
 247         int s;
 248
 249         if (strlen(server) > (UNIX_PATH_MAX + 1)) return(0);
 250         if (!ssl_sock_init()) return(0);
 251
 252         s=socket(AF_UNIX, SOCK_STREAM, 0);
 253         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 254
 255         memset((char *)&them,0,sizeof(them));
 256         them.sun_family=AF_UNIX;
 257         strcpy(them.sun_path, server);
 258
 259         if (connect(s, (struct sockaddr *)&them, sizeof(them)) == -1)
 260                 { closesocket(s); perror("connect"); return(0); }
 261         *sock=s;
 262         return(1);
 263         }
 264 #endif
 265
 266 int do_server(int port, int type, int *ret,
 267               int (*cb)(char *hostname, int s, int stype, unsigned char *context),
 268               unsigned char *context, int naccept)
 269         {
 270         int sock;
 271         char *name = NULL;
 272         int accept_socket = 0;
 273         int i;
 274
 275         if (!init_server(&accept_socket,port,type)) return(0);
 276
 277         if (ret != NULL)
 278                 {
 279                 *ret=accept_socket;
 280                 /* return(1);*/
 281                 }
 282         for (;;)
 283                 {
 284                 if (type==SOCK_STREAM)
 285                         {
 286 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 287                         if (do_accept(accept_socket,&sock,NULL) == 0)
 288 #else
 289                         if (do_accept(accept_socket,&sock,&name) == 0)
 290 #endif
 291                                 {
 292                                 SHUTDOWN(accept_socket);
 293                                 return(0);
 294                                 }
 295                         }
 296                 else
 297                         sock = accept_socket;
 298                 i=(*cb)(name,sock, type, context);
 299                 if (name != NULL) OPENSSL_free(name);
 300                 if (type==SOCK_STREAM)
 301                         SHUTDOWN2(sock);
 302                 if (naccept != -1)
 303                         naccept--;
 304                 if (i < 0 || naccept == 0)
 305                         {
 306                         SHUTDOWN2(accept_socket);
 307                         return(i);
 308                         }
 309                 }
 310         }
 311
 312 #ifndef NO_SYS_UN_H
 313 int do_server_unix(const char *path, int *ret,
 314                    int (*cb)(char *hostname, int s, int stype, unsigned char *context),
 315                    unsigned char *context, int naccept)
 316         {
 317         int sock;
 318         int accept_socket = 0;
 319         int i;
 320
 321         if (!init_server_unix(&accept_socket, path)) return(0);
 322
 323         if (ret != NULL)
 324                 *ret=accept_socket;
 325         for (;;)
 326                 {
 327                 if (do_accept_unix(accept_socket, &sock) == 0)
 328                         {
 329                         SHUTDOWN(accept_socket);
 330                         i = 0;
 331                         goto out;
 332                         }
 333                 i=(*cb)(NULL, sock, 0, context);
 334                 SHUTDOWN2(sock);
 335                 if (naccept != -1)
 336                         naccept--;
 337                 if (i < 0 || naccept == 0)
 338                         {
 339                         SHUTDOWN2(accept_socket);
 340                         goto out;
 341                         }
 342                 }
 343 out:
 344         unlink(path);
 345         return(i);
 346         }
 347 #endif
 348
 349 static int init_server_long(int *sock, int port, char *ip, int type)
 350         {
 351         int ret=0;
 352         struct sockaddr_in server;
 353         int s= -1;
 354
 355         if (!ssl_sock_init()) return(0);
 356
 357         memset((char *)&server,0,sizeof(server));
 358         server.sin_family=AF_INET;
 359         server.sin_port=htons((unsigned short)port);
 360         if (ip == NULL)
 361                 server.sin_addr.s_addr=INADDR_ANY;
 362         else
 363 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 364 #ifndef BIT_FIELD_LIMITS
 365                 memcpy(&server.sin_addr.s_addr,ip,4);
 366 #else
 367                 memcpy(&server.sin_addr,ip,4);
 368 #endif
 369
 370                 if (type == SOCK_STREAM)
 371                         s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
 372                 else /* type == SOCK_DGRAM */
 373                         s=socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP);
 374
 375         if (s == INVALID_SOCKET) goto err;
 376 #if defined SOL_SOCKET && defined SO_REUSEADDR
 377                 {
 378                 int j = 1;
 379                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 380                            (void *) &j, sizeof j);
 381                 }
 382 #endif
 383         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 384                 {
 385 #ifndef OPENSSL_SYS_WINDOWS
 386                 perror("bind");
 387 #endif
 388                 goto err;
 389                 }
 390         /* Make it 128 for linux */
 391         if (type==SOCK_STREAM && listen(s,128) == -1) goto err;
 392         *sock=s;
 393         ret=1;
 394 err:
 395         if ((ret == 0) && (s != -1))
 396                 {
 397                 SHUTDOWN(s);
 398                 }
 399         return(ret);
 400         }
 401
 402 static int init_server(int *sock, int port, int type)
 403         {
 404         return(init_server_long(sock, port, NULL, type));
 405         }
 406
 407 #ifndef NO_SYS_UN_H
 408 static int init_server_unix(int *sock, const char *path)
 409         {
 410         int ret = 0;
 411         struct sockaddr_un server;
 412         int s = -1;
 413
 414         if (strlen(path) > (UNIX_PATH_MAX + 1)) return(0);
 415         if (!ssl_sock_init()) return(0);
 416
 417         s=socket(AF_UNIX, SOCK_STREAM, 0);
 418         if (s == INVALID_SOCKET) goto err;
 419
 420         memset((char *)&server,0,sizeof(server));
 421         server.sun_family=AF_UNIX;
 422         strcpy(server.sun_path, path);
 423
 424         if (bind(s, (struct sockaddr *)&server, sizeof(server)) == -1)
 425                 {
 426 #ifndef OPENSSL_SYS_WINDOWS
 427                 perror("bind");
 428 #endif
 429                 goto err;
 430                 }
 431         /* Make it 128 for linux */
 432         if (listen(s,128) == -1)
 433                 {
 434 #ifndef OPENSSL_SYS_WINDOWS
 435                 perror("listen");
 436 #endif
 437                 unlink(path);
 438                 goto err;
 439                 }
 440         *sock=s;
 441         ret=1;
 442 err:
 443         if ((ret == 0) && (s != -1))
 444                 {
 445                 SHUTDOWN(s);
 446                 }
 447         return(ret);
 448         }
 449 #endif
 450
 451 static int do_accept(int acc_sock, int *sock, char **host)
 452         {
 453         int ret;
 454         struct hostent *h1,*h2;
 455         static struct sockaddr_in from;
 456         int len;
 457 /*      struct linger ling; */
 458
 459         if (!ssl_sock_init()) return(0);
 460
 461 #ifndef OPENSSL_SYS_WINDOWS
 462 redoit:
 463 #endif
 464
 465         memset((char *)&from,0,sizeof(from));
 466         len=sizeof(from);
 467         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 468          * of type (int *) whereas under other systems it is (void *) if
 469          * you don't have a cast it will choke the compiler: if you do
 470          * have a cast then you can either go for (int *) or (void *).
 471          */
 472         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
 473         if (ret == INVALID_SOCKET)
 474                 {
 475 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
 476                 int i;
 477                 i=WSAGetLastError();
 478                 BIO_printf(bio_err,"accept error %d\n",i);
 479 #else
 480                 if (errno == EINTR)
 481                         {
 482                         /*check_timeout(); */
 483                         goto redoit;
 484                         }
 485                 fprintf(stderr,"errno=%d ",errno);
 486                 perror("accept");
 487 #endif
 488                 return(0);
 489                 }
 490
 491 /*-
 492         ling.l_onoff=1;
 493         ling.l_linger=0;
 494         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 495         if (i < 0) { perror("linger"); return(0); }
 496         i=0;
 497         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 498         if (i < 0) { perror("keepalive"); return(0); }
 499 */
 500
 501         if (host == NULL) goto end;
 502 #ifndef BIT_FIELD_LIMITS
 503         /* I should use WSAAsyncGetHostByName() under windows */
 504         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
 505                 sizeof(from.sin_addr.s_addr),AF_INET);
 506 #else
 507         h1=gethostbyaddr((char *)&from.sin_addr,
 508                 sizeof(struct in_addr),AF_INET);
 509 #endif
 510         if (h1 == NULL)
 511                 {
 512                 BIO_printf(bio_err,"bad gethostbyaddr\n");
 513                 *host=NULL;
 514                 /* return(0); */
 515                 }
 516         else
 517                 {
 518                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
 519                         {
 520                         perror("OPENSSL_malloc");
 521                         closesocket(ret);
 522                         return(0);
 523                         }
 524                 BUF_strlcpy(*host,h1->h_name,strlen(h1->h_name)+1);
 525
 526                 h2=GetHostByName(*host);
 527                 if (h2 == NULL)
 528                         {
 529                         BIO_printf(bio_err,"gethostbyname failure\n");
 530                         closesocket(ret);
 531                         return(0);
 532                         }
 533                 if (h2->h_addrtype != AF_INET)
 534                         {
 535                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 536                         closesocket(ret);
 537                         return(0);
 538                         }
 539                 }
 540 end:
 541         *sock=ret;
 542         return(1);
 543         }
 544
 545 #ifndef NO_SYS_UN_H
 546 static int do_accept_unix(int acc_sock, int *sock)
 547         {
 548         int ret;
 549
 550         if (!ssl_sock_init()) return(0);
 551
 552 redoit:
 553         ret=accept(acc_sock, NULL, NULL);
 554         if (ret == INVALID_SOCKET)
 555                 {
 556                 if (errno == EINTR)
 557                         {
 558                         /*check_timeout(); */
 559                         goto redoit;
 560                         }
 561                 fprintf(stderr,"errno=%d ",errno);
 562                 perror("accept");
 563                 return(0);
 564                 }
 565
 566         *sock=ret;
 567         return(1);
 568         }
 569 #endif
 570
 571 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 572              short *port_ptr)
 573         {
 574         char *h,*p;
 575
 576         h=str;
 577         p=strchr(str,':');
 578         if (p == NULL)
 579                 {
 580                 BIO_printf(bio_err,"no port defined\n");
 581                 return(0);
 582                 }
 583         *(p++)='\0';
 584
 585         if ((ip != NULL) && !host_ip(str,ip))
 586                 goto err;
 587         if (host_ptr != NULL) *host_ptr=h;
 588
 589         if (!extract_port(p,port_ptr))
 590                 goto err;
 591         return(1);
 592 err:
 593         return(0);
 594         }
 595
 596 static int host_ip(const char *str, unsigned char ip[4])
 597         {
 598         unsigned int in[4];
 599         int i;
 600
 601         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
 602                 {
 603                 for (i=0; i<4; i++)
 604                         if (in[i] > 255)
 605                                 {
 606                                 BIO_printf(bio_err,"invalid IP address\n");
 607                                 goto err;
 608                                 }
 609                 ip[0]=in[0];
 610                 ip[1]=in[1];
 611                 ip[2]=in[2];
 612                 ip[3]=in[3];
 613                 }
 614         else
 615                 { /* do a gethostbyname */
 616                 struct hostent *he;
 617
 618                 if (!ssl_sock_init()) return(0);
 619
 620                 he=GetHostByName(str);
 621                 if (he == NULL)
 622                         {
 623                         BIO_printf(bio_err,"gethostbyname failure\n");
 624                         goto err;
 625                         }
 626                 if (he->h_addrtype != AF_INET)
 627                         {
 628                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 629                         return(0);
 630                         }
 631                 ip[0]=he->h_addr_list[0][0];
 632                 ip[1]=he->h_addr_list[0][1];
 633                 ip[2]=he->h_addr_list[0][2];
 634                 ip[3]=he->h_addr_list[0][3];
 635                 }
 636         return(1);
 637 err:
 638         return(0);
 639         }
 640
 641 int extract_port(const char *str, short *port_ptr)
 642         {
 643         int i;
 644         struct servent *s;
 645
 646         i=atoi(str);
 647         if (i != 0)
 648                 *port_ptr=(unsigned short)i;
 649         else
 650                 {
 651                 s=getservbyname(str,"tcp");
 652                 if (s == NULL)
 653                         {
 654                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
 655                         return(0);
 656                         }
 657                 *port_ptr=ntohs((unsigned short)s->s_port);
 658                 }
 659         return(1);
 660         }
 661
 662 #define GHBN_NUM        4
 663 static struct ghbn_cache_st
 664         {
 665         char name[128];
 666         struct hostent ent;
 667         unsigned long order;
 668         } ghbn_cache[GHBN_NUM];
 669
 670 static unsigned long ghbn_hits=0L;
 671 static unsigned long ghbn_miss=0L;
 672
 673 static struct hostent *GetHostByName(const char *name)
 674         {
 675         struct hostent *ret;
 676         int i,lowi=0;
 677         unsigned long low= (unsigned long)-1;
 678
 679         for (i=0; i<GHBN_NUM; i++)
 680                 {
 681                 if (low > ghbn_cache[i].order)
 682                         {
 683                         low=ghbn_cache[i].order;
 684                         lowi=i;
 685                         }
 686                 if (ghbn_cache[i].order > 0)
 687                         {
 688                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
 689                                 break;
 690                         }
 691                 }
 692         if (i == GHBN_NUM) /* no hit*/
 693                 {
 694                 ghbn_miss++;
 695                 ret=gethostbyname(name);
 696                 if (ret == NULL) return(NULL);
 697                 /* else add to cache */
 698                 if(strlen(name) < sizeof ghbn_cache[0].name)
 699                         {
 700                         strcpy(ghbn_cache[lowi].name,name);
 701                         memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
 702                         ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
 703                         }
 704                 return(ret);
 705                 }
 706         else
 707                 {
 708                 ghbn_hits++;
 709                 ret= &(ghbn_cache[i].ent);
 710                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
 711                 return(ret);
 712                 }
 713         }
 714
 715 #endif