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 #include <stdio.h>
  60 #include <errno.h>
  61 #define USE_SOCKETS
  62 #include "cryptlib.h"
  63 #include <openssl/bio.h>
  64
  65 #ifndef OPENSSL_NO_SOCK
  66
  67 # ifdef OPENSSL_SYS_WIN16
  68 #  define SOCKET_PROTOCOL 0     /* more microsoft stupidity */
  69 # else
  70 #  define SOCKET_PROTOCOL IPPROTO_TCP
  71 # endif
  72
  73 # if (defined(OPENSSL_SYS_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     int state;
  80     char *param_addr;
  81     int accept_sock;
  82     int accept_nbio;
  83     char *addr;
  84     int nbio;
  85     /*
  86      * If 0, it means normal, if 1, do a connect on bind failure, and if
  87      * there is no-one listening, bind with SO_REUSEADDR. If 2, always use
  88      * SO_REUSEADDR.
  89      */
  90     int bind_mode;
  91     BIO *bio_chain;
  92 } BIO_ACCEPT;
  93
  94 static int acpt_write(BIO *h, const char *buf, int num);
  95 static int acpt_read(BIO *h, char *buf, int size);
  96 static int acpt_puts(BIO *h, const char *str);
  97 static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  98 static int acpt_new(BIO *h);
  99 static int acpt_free(BIO *data);
 100 static int acpt_state(BIO *b, BIO_ACCEPT *c);
 101 static void acpt_close_socket(BIO *data);
 102 BIO_ACCEPT *BIO_ACCEPT_new(void);
 103 void BIO_ACCEPT_free(BIO_ACCEPT *a);
 104
 105 # define ACPT_S_BEFORE                   1
 106 # define ACPT_S_GET_ACCEPT_SOCKET        2
 107 # define ACPT_S_OK                       3
 108
 109 static BIO_METHOD methods_acceptp = {
 110     BIO_TYPE_ACCEPT,
 111     "socket accept",
 112     acpt_write,
 113     acpt_read,
 114     acpt_puts,
 115     NULL,                       /* connect_gets, */
 116     acpt_ctrl,
 117     acpt_new,
 118     acpt_free,
 119     NULL,
 120 };
 121
 122 BIO_METHOD *BIO_s_accept(void)
 123 {
 124     return (&methods_acceptp);
 125 }
 126
 127 static int acpt_new(BIO *bi)
 128 {
 129     BIO_ACCEPT *ba;
 130
 131     bi->init = 0;
 132     bi->num = INVALID_SOCKET;
 133     bi->flags = 0;
 134     if ((ba = BIO_ACCEPT_new()) == NULL)
 135         return (0);
 136     bi->ptr = (char *)ba;
 137     ba->state = ACPT_S_BEFORE;
 138     bi->shutdown = 1;
 139     return (1);
 140 }
 141
 142 BIO_ACCEPT *BIO_ACCEPT_new(void)
 143 {
 144     BIO_ACCEPT *ret;
 145
 146     if ((ret = (BIO_ACCEPT *)OPENSSL_malloc(sizeof(BIO_ACCEPT))) == NULL)
 147         return (NULL);
 148
 149     memset(ret, 0, sizeof(BIO_ACCEPT));
 150     ret->accept_sock = INVALID_SOCKET;
 151     ret->bind_mode = BIO_BIND_NORMAL;
 152     return (ret);
 153 }
 154
 155 void BIO_ACCEPT_free(BIO_ACCEPT *a)
 156 {
 157     if (a == NULL)
 158         return;
 159
 160     if (a->param_addr != NULL)
 161         OPENSSL_free(a->param_addr);
 162     if (a->addr != NULL)
 163         OPENSSL_free(a->addr);
 164     if (a->bio_chain != NULL)
 165         BIO_free(a->bio_chain);
 166     OPENSSL_free(a);
 167 }
 168
 169 static void acpt_close_socket(BIO *bio)
 170 {
 171     BIO_ACCEPT *c;
 172
 173     c = (BIO_ACCEPT *)bio->ptr;
 174     if (c->accept_sock != INVALID_SOCKET) {
 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)
 187         return (0);
 188     data = (BIO_ACCEPT *)a->ptr;
 189
 190     if (a->shutdown) {
 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     case ACPT_S_BEFORE:
 209         if (c->param_addr == NULL) {
 210             BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_PORT_SPECIFIED);
 211             return (-1);
 212         }
 213         s = BIO_get_accept_socket(c->param_addr, c->bind_mode);
 214         if (s == INVALID_SOCKET)
 215             return (-1);
 216
 217         if (c->accept_nbio) {
 218             if (!BIO_socket_nbio(s, 1)) {
 219                 closesocket(s);
 220                 BIOerr(BIO_F_ACPT_STATE,
 221                        BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
 222                 return (-1);
 223             }
 224         }
 225         c->accept_sock = s;
 226         b->num = s;
 227         c->state = ACPT_S_GET_ACCEPT_SOCKET;
 228         return (1);
 229         /* break; */
 230     case ACPT_S_GET_ACCEPT_SOCKET:
 231         if (b->next_bio != NULL) {
 232             c->state = ACPT_S_OK;
 233             goto again;
 234         }
 235         BIO_clear_retry_flags(b);
 236         b->retry_reason = 0;
 237         i = BIO_accept(c->accept_sock, &(c->addr));
 238
 239         /* -2 return means we should retry */
 240         if (i == -2) {
 241             BIO_set_retry_special(b);
 242             b->retry_reason = BIO_RR_ACCEPT;
 243             return -1;
 244         }
 245
 246         if (i < 0)
 247             return (i);
 248
 249         bio = BIO_new_socket(i, BIO_CLOSE);
 250         if (bio == NULL)
 251             goto err;
 252
 253         BIO_set_callback(bio, BIO_get_callback(b));
 254         BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
 255
 256         if (c->nbio) {
 257             if (!BIO_socket_nbio(i, 1)) {
 258                 BIOerr(BIO_F_ACPT_STATE,
 259                        BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
 260                 goto err;
 261             }
 262         }
 263
 264         /*
 265          * If the accept BIO has an bio_chain, we dup it and put the new
 266          * socket at the end.
 267          */
 268         if (c->bio_chain != NULL) {
 269             if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
 270                 goto err;
 271             if (!BIO_push(dbio, bio))
 272                 goto err;
 273             bio = dbio;
 274         }
 275         if (BIO_push(b, bio) == NULL)
 276             goto err;
 277
 278         c->state = ACPT_S_OK;
 279         return (1);
 280  err:
 281         if (bio != NULL)
 282             BIO_free(bio);
 283         else if (s >= 0)
 284             closesocket(s);
 285         return (0);
 286         /* break; */
 287     case ACPT_S_OK:
 288         if (b->next_bio == NULL) {
 289             c->state = ACPT_S_GET_ACCEPT_SOCKET;
 290             goto again;
 291         }
 292         return (1);
 293         /* break; */
 294     default:
 295         return (0);
 296         /* break; */
 297     }
 298
 299 }
 300
 301 static int acpt_read(BIO *b, char *out, int outl)
 302 {
 303     int ret = 0;
 304     BIO_ACCEPT *data;
 305
 306     BIO_clear_retry_flags(b);
 307     data = (BIO_ACCEPT *)b->ptr;
 308
 309     while (b->next_bio == NULL) {
 310         ret = acpt_state(b, data);
 311         if (ret <= 0)
 312             return (ret);
 313     }
 314
 315     ret = BIO_read(b->next_bio, out, outl);
 316     BIO_copy_next_retry(b);
 317     return (ret);
 318 }
 319
 320 static int acpt_write(BIO *b, const char *in, int inl)
 321 {
 322     int ret;
 323     BIO_ACCEPT *data;
 324
 325     BIO_clear_retry_flags(b);
 326     data = (BIO_ACCEPT *)b->ptr;
 327
 328     while (b->next_bio == NULL) {
 329         ret = acpt_state(b, data);
 330         if (ret <= 0)
 331             return (ret);
 332     }
 333
 334     ret = BIO_write(b->next_bio, in, inl);
 335     BIO_copy_next_retry(b);
 336     return (ret);
 337 }
 338
 339 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
 340 {
 341     int *ip;
 342     long ret = 1;
 343     BIO_ACCEPT *data;
 344     char **pp;
 345
 346     data = (BIO_ACCEPT *)b->ptr;
 347
 348     switch (cmd) {
 349     case BIO_CTRL_RESET:
 350         ret = 0;
 351         data->state = ACPT_S_BEFORE;
 352         acpt_close_socket(b);
 353         b->flags = 0;
 354         break;
 355     case BIO_C_DO_STATE_MACHINE:
 356         /* use this one to start the connection */
 357         ret = (long)acpt_state(b, data);
 358         break;
 359     case BIO_C_SET_ACCEPT:
 360         if (ptr != NULL) {
 361             if (num == 0) {
 362                 b->init = 1;
 363                 if (data->param_addr != NULL)
 364                     OPENSSL_free(data->param_addr);
 365                 data->param_addr = BUF_strdup(ptr);
 366             } else if (num == 1) {
 367                 data->accept_nbio = (ptr != NULL);
 368             } else if (num == 2) {
 369                 if (data->bio_chain != NULL)
 370                     BIO_free(data->bio_chain);
 371                 data->bio_chain = (BIO *)ptr;
 372             }
 373         }
 374         break;
 375     case BIO_C_SET_NBIO:
 376         data->nbio = (int)num;
 377         break;
 378     case BIO_C_SET_FD:
 379         b->init = 1;
 380         b->num = *((int *)ptr);
 381         data->accept_sock = b->num;
 382         data->state = ACPT_S_GET_ACCEPT_SOCKET;
 383         b->shutdown = (int)num;
 384         b->init = 1;
 385         break;
 386     case BIO_C_GET_FD:
 387         if (b->init) {
 388             ip = (int *)ptr;
 389             if (ip != NULL)
 390                 *ip = data->accept_sock;
 391             ret = data->accept_sock;
 392         } else
 393             ret = -1;
 394         break;
 395     case BIO_C_GET_ACCEPT:
 396         if (b->init) {
 397             if (ptr != NULL) {
 398                 pp = (char **)ptr;
 399                 *pp = data->param_addr;
 400             } else
 401                 ret = -1;
 402         } else
 403             ret = -1;
 404         break;
 405     case BIO_CTRL_GET_CLOSE:
 406         ret = b->shutdown;
 407         break;
 408     case BIO_CTRL_SET_CLOSE:
 409         b->shutdown = (int)num;
 410         break;
 411     case BIO_CTRL_PENDING:
 412     case BIO_CTRL_WPENDING:
 413         ret = 0;
 414         break;
 415     case BIO_CTRL_FLUSH:
 416         break;
 417     case BIO_C_SET_BIND_MODE:
 418         data->bind_mode = (int)num;
 419         break;
 420     case BIO_C_GET_BIND_MODE:
 421         ret = (long)data->bind_mode;
 422         break;
 423     case BIO_CTRL_DUP:
 424 /*-     dbio=(BIO *)ptr;
 425         if (data->param_port) EAY EAY
 426                 BIO_set_port(dbio,data->param_port);
 427         if (data->param_hostname)
 428                 BIO_set_hostname(dbio,data->param_hostname);
 429         BIO_set_nbio(dbio,data->nbio); */
 430         break;
 431
 432     default:
 433         ret = 0;
 434         break;
 435     }
 436     return (ret);
 437 }
 438
 439 static int acpt_puts(BIO *bp, const char *str)
 440 {
 441     int n, ret;
 442
 443     n = strlen(str);
 444     ret = acpt_write(bp, str, n);
 445     return (ret);
 446 }
 447
 448 BIO *BIO_new_accept(char *str)
 449 {
 450     BIO *ret;
 451
 452     ret = BIO_new(BIO_s_accept());
 453     if (ret == NULL)
 454         return (NULL);
 455     if (BIO_set_accept_port(ret, str))
 456         return (ret);
 457     else {
 458         BIO_free(ret);
 459         return (NULL);
 460     }
 461 }
 462
 463 #endif