crypto/bio/bss_acpt.c

   1 /* crypto/bio/bss_acpt.c */
   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 #ifndef NO_SOCK
  60
  61 #include <stdio.h>
  62 #include <errno.h>
  63 #define USE_SOCKETS
  64 #include "cryptlib.h"
  65 #include <openssl/bio.h>
  66
  67 #ifdef WIN16
  68 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  69 #else
  70 #define SOCKET_PROTOCOL IPPROTO_TCP
  71 #endif
  72
  73 #if (defined(VMS) && __VMS_VER < 70000000)
  74 /* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
  75 #undef FIONBIO
  76 #endif
  77
  78 typedef struct bio_accept_st
  79         {
  80         int state;
  81         char *param_addr;
  82
  83         int accept_sock;
  84         int accept_nbio;
  85
  86         char *addr;
  87         int nbio;
  88         /* If 0, it means normal, if 1, do a connect on bind failure,
  89          * and if there is no-one listening, bind with SO_REUSEADDR.
  90          * If 2, always use SO_REUSEADDR. */
  91         int bind_mode;
  92         BIO *bio_chain;
  93         } BIO_ACCEPT;
  94
  95 static int acpt_write(BIO *h, const char *buf, int num);
  96 static int acpt_read(BIO *h, char *buf, int size);
  97 static int acpt_puts(BIO *h, const char *str);
  98 static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  99 static int acpt_new(BIO *h);
 100 static int acpt_free(BIO *data);
 101 static int acpt_state(BIO *b, BIO_ACCEPT *c);
 102 static void acpt_close_socket(BIO *data);
 103 BIO_ACCEPT *BIO_ACCEPT_new(void );
 104 void BIO_ACCEPT_free(BIO_ACCEPT *a);
 105
 106 #define ACPT_S_BEFORE                   1
 107 #define ACPT_S_GET_ACCEPT_SOCKET        2
 108 #define ACPT_S_OK                       3
 109
 110 static BIO_METHOD methods_acceptp=
 111         {
 112         BIO_TYPE_ACCEPT,
 113         "socket accept",
 114         acpt_write,
 115         acpt_read,
 116         acpt_puts,
 117         NULL, /* connect_gets, */
 118         acpt_ctrl,
 119         acpt_new,
 120         acpt_free,
 121         NULL,
 122         };
 123
 124 BIO_METHOD *BIO_s_accept(void)
 125         {
 126         return(&methods_acceptp);
 127         }
 128
 129 static int acpt_new(BIO *bi)
 130         {
 131         BIO_ACCEPT *ba;
 132
 133         bi->init=0;
 134         bi->num=INVALID_SOCKET;
 135         bi->flags=0;
 136         if ((ba=BIO_ACCEPT_new()) == NULL)
 137                 return(0);
 138         bi->ptr=(char *)ba;
 139         ba->state=ACPT_S_BEFORE;
 140         bi->shutdown=1;
 141         return(1);
 142         }
 143
 144 BIO_ACCEPT *BIO_ACCEPT_new(void)
 145         {
 146         BIO_ACCEPT *ret;
 147
 148         if ((ret=(BIO_ACCEPT *)OPENSSL_malloc(sizeof(BIO_ACCEPT))) == NULL)
 149                 return(NULL);
 150
 151         memset(ret,0,sizeof(BIO_ACCEPT));
 152         ret->accept_sock=INVALID_SOCKET;
 153         ret->bind_mode=BIO_BIND_NORMAL;
 154         return(ret);
 155         }
 156
 157 void BIO_ACCEPT_free(BIO_ACCEPT *a)
 158         {
 159         if(a == NULL)
 160             return;
 161
 162         if (a->param_addr != NULL) OPENSSL_free(a->param_addr);
 163         if (a->addr != NULL) OPENSSL_free(a->addr);
 164         if (a->bio_chain != NULL) BIO_free(a->bio_chain);
 165         OPENSSL_free(a);
 166         }
 167
 168 static void acpt_close_socket(BIO *bio)
 169         {
 170         BIO_ACCEPT *c;
 171
 172         c=(BIO_ACCEPT *)bio->ptr;
 173         if (c->accept_sock != INVALID_SOCKET)
 174                 {
 175                 shutdown(c->accept_sock,2);
 176                 closesocket(c->accept_sock);
 177                 c->accept_sock=INVALID_SOCKET;
 178                 bio->num=INVALID_SOCKET;
 179                 }
 180         }
 181
 182 static int acpt_free(BIO *a)
 183         {
 184         BIO_ACCEPT *data;
 185
 186         if (a == NULL) return(0);
 187         data=(BIO_ACCEPT *)a->ptr;
 188
 189         if (a->shutdown)
 190                 {
 191                 acpt_close_socket(a);
 192                 BIO_ACCEPT_free(data);
 193                 a->ptr=NULL;
 194                 a->flags=0;
 195                 a->init=0;
 196                 }
 197         return(1);
 198         }
 199
 200 static int acpt_state(BIO *b, BIO_ACCEPT *c)
 201         {
 202         BIO *bio=NULL,*dbio;
 203         int s= -1;
 204         int i;
 205
 206 again:
 207         switch (c->state)
 208                 {
 209         case ACPT_S_BEFORE:
 210                 if (c->param_addr == NULL)
 211                         {
 212                         BIOerr(BIO_F_ACPT_STATE,BIO_R_NO_ACCEPT_PORT_SPECIFIED);
 213                         return(-1);
 214                         }
 215                 s=BIO_get_accept_socket(c->param_addr,c->bind_mode);
 216                 if (s == INVALID_SOCKET)
 217                         return(-1);
 218
 219                 if (c->accept_nbio)
 220                         {
 221                         if (!BIO_socket_nbio(s,1))
 222                                 {
 223                                 closesocket(s);
 224                                 BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
 225                                 return(-1);
 226                                 }
 227                         }
 228                 c->accept_sock=s;
 229                 b->num=s;
 230                 c->state=ACPT_S_GET_ACCEPT_SOCKET;
 231                 return(1);
 232                 /* break; */
 233         case ACPT_S_GET_ACCEPT_SOCKET:
 234                 if (b->next_bio != NULL)
 235                         {
 236                         c->state=ACPT_S_OK;
 237                         goto again;
 238                         }
 239                 BIO_clear_retry_flags(b);
 240                 b->retry_reason=0;
 241                 i=BIO_accept(c->accept_sock,&(c->addr));
 242
 243                 /* -2 return means we should retry */
 244                 if(i == -2)
 245                         {
 246                         BIO_set_retry_special(b);
 247                         b->retry_reason=BIO_RR_ACCEPT;
 248                         return -1;
 249                         }
 250
 251                 if (i < 0) return(i);
 252
 253                 bio=BIO_new_socket(i,BIO_CLOSE);
 254                 if (bio == NULL) goto err;
 255
 256                 BIO_set_callback(bio,BIO_get_callback(b));
 257                 BIO_set_callback_arg(bio,BIO_get_callback_arg(b));
 258
 259                 if (c->nbio)
 260                         {
 261                         if (!BIO_socket_nbio(i,1))
 262                                 {
 263                                 BIOerr(BIO_F_ACPT_STATE,BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
 264                                 goto err;
 265                                 }
 266                         }
 267
 268                 /* If the accept BIO has an bio_chain, we dup it and
 269                  * put the new socket at the end. */
 270                 if (c->bio_chain != NULL)
 271                         {
 272                         if ((dbio=BIO_dup_chain(c->bio_chain)) == NULL)
 273                                 goto err;
 274                         if (!BIO_push(dbio,bio)) goto err;
 275                         bio=dbio;
 276                         }
 277                 if (BIO_push(b,bio) == NULL) goto err;
 278
 279                 c->state=ACPT_S_OK;
 280                 return(1);
 281 err:
 282                 if (bio != NULL)
 283                         BIO_free(bio);
 284                 else if (s >= 0)
 285                         closesocket(s);
 286                 return(0);
 287                 /* break; */
 288         case ACPT_S_OK:
 289                 if (b->next_bio == NULL)
 290                         {
 291                         c->state=ACPT_S_GET_ACCEPT_SOCKET;
 292                         goto again;
 293                         }
 294                 return(1);
 295                 /* break; */
 296         default:
 297                 return(0);
 298                 /* break; */
 299                 }
 300
 301         }
 302
 303 static int acpt_read(BIO *b, char *out, int outl)
 304         {
 305         int ret=0;
 306         BIO_ACCEPT *data;
 307
 308         BIO_clear_retry_flags(b);
 309         data=(BIO_ACCEPT *)b->ptr;
 310
 311         while (b->next_bio == NULL)
 312                 {
 313                 ret=acpt_state(b,data);
 314                 if (ret <= 0) return(ret);
 315                 }
 316
 317         ret=BIO_read(b->next_bio,out,outl);
 318         BIO_copy_next_retry(b);
 319         return(ret);
 320         }
 321
 322 static int acpt_write(BIO *b, const char *in, int inl)
 323         {
 324         int ret;
 325         BIO_ACCEPT *data;
 326
 327         BIO_clear_retry_flags(b);
 328         data=(BIO_ACCEPT *)b->ptr;
 329
 330         while (b->next_bio == NULL)
 331                 {
 332                 ret=acpt_state(b,data);
 333                 if (ret <= 0) return(ret);
 334                 }
 335
 336         ret=BIO_write(b->next_bio,in,inl);
 337         BIO_copy_next_retry(b);
 338         return(ret);
 339         }
 340
 341 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
 342         {
 343         BIO *dbio;
 344         int *ip;
 345         long ret=1;
 346         BIO_ACCEPT *data;
 347         char **pp;
 348
 349         data=(BIO_ACCEPT *)b->ptr;
 350
 351         switch (cmd)
 352                 {
 353         case BIO_CTRL_RESET:
 354                 ret=0;
 355                 data->state=ACPT_S_BEFORE;
 356                 acpt_close_socket(b);
 357                 b->flags=0;
 358                 break;
 359         case BIO_C_DO_STATE_MACHINE:
 360                 /* use this one to start the connection */
 361                 ret=(long)acpt_state(b,data);
 362                 break;
 363         case BIO_C_SET_ACCEPT:
 364                 if (ptr != NULL)
 365                         {
 366                         if (num == 0)
 367                                 {
 368                                 b->init=1;
 369                                 if (data->param_addr != NULL)
 370                                         OPENSSL_free(data->param_addr);
 371                                 data->param_addr=BUF_strdup(ptr);
 372                                 }
 373                         else if (num == 1)
 374                                 {
 375                                 data->accept_nbio=(ptr != NULL);
 376                                 }
 377                         else if (num == 2)
 378                                 {
 379                                 if (data->bio_chain != NULL)
 380                                         BIO_free(data->bio_chain);
 381                                 data->bio_chain=(BIO *)ptr;
 382                                 }
 383                         }
 384                 break;
 385         case BIO_C_SET_NBIO:
 386                 data->nbio=(int)num;
 387                 break;
 388         case BIO_C_SET_FD:
 389                 b->init=1;
 390                 b->num= *((int *)ptr);
 391                 data->accept_sock=b->num;
 392                 data->state=ACPT_S_GET_ACCEPT_SOCKET;
 393                 b->shutdown=(int)num;
 394                 b->init=1;
 395                 break;
 396         case BIO_C_GET_FD:
 397                 if (b->init)
 398                         {
 399                         ip=(int *)ptr;
 400                         if (ip != NULL)
 401                                 *ip=data->accept_sock;
 402                         ret=data->accept_sock;
 403                         }
 404                 else
 405                         ret= -1;
 406                 break;
 407         case BIO_C_GET_ACCEPT:
 408                 if (b->init)
 409                         {
 410                         if (ptr != NULL)
 411                                 {
 412                                 pp=(char **)ptr;
 413                                 *pp=data->param_addr;
 414                                 }
 415                         else
 416                                 ret= -1;
 417                         }
 418                 else
 419                         ret= -1;
 420                 break;
 421         case BIO_CTRL_GET_CLOSE:
 422                 ret=b->shutdown;
 423                 break;
 424         case BIO_CTRL_SET_CLOSE:
 425                 b->shutdown=(int)num;
 426                 break;
 427         case BIO_CTRL_PENDING:
 428         case BIO_CTRL_WPENDING:
 429                 ret=0;
 430                 break;
 431         case BIO_CTRL_FLUSH:
 432                 break;
 433         case BIO_C_SET_BIND_MODE:
 434                 data->bind_mode=(int)num;
 435                 break;
 436         case BIO_C_GET_BIND_MODE:
 437                 ret=(long)data->bind_mode;
 438                 break;
 439         case BIO_CTRL_DUP:
 440                 dbio=(BIO *)ptr;
 441 /*              if (data->param_port) EAY EAY
 442                         BIO_set_port(dbio,data->param_port);
 443                 if (data->param_hostname)
 444                         BIO_set_hostname(dbio,data->param_hostname);
 445                 BIO_set_nbio(dbio,data->nbio); */
 446                 break;
 447
 448         default:
 449                 ret=0;
 450                 break;
 451                 }
 452         return(ret);
 453         }
 454
 455 static int acpt_puts(BIO *bp, const char *str)
 456         {
 457         int n,ret;
 458
 459         n=strlen(str);
 460         ret=acpt_write(bp,str,n);
 461         return(ret);
 462         }
 463
 464 BIO *BIO_new_accept(char *str)
 465         {
 466         BIO *ret;
 467
 468         ret=BIO_new(BIO_s_accept());
 469         if (ret == NULL) return(NULL);
 470         if (BIO_set_accept_port(ret,str))
 471                 return(ret);
 472         else
 473                 {
 474                 BIO_free(ret);
 475                 return(NULL);
 476                 }
 477         }
 478
 479 #endif