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