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 = (BIO_ACCEPT *)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     if (a->bio_chain != NULL)
 159         BIO_free(a->bio_chain);
 160     OPENSSL_free(a);
 161 }
 162
 163 static void acpt_close_socket(BIO *bio)
 164 {
 165     BIO_ACCEPT *c;
 166
 167     c = (BIO_ACCEPT *)bio->ptr;
 168     if (c->accept_sock != INVALID_SOCKET) {
 169         shutdown(c->accept_sock, 2);
 170         closesocket(c->accept_sock);
 171         c->accept_sock = INVALID_SOCKET;
 172         bio->num = INVALID_SOCKET;
 173     }
 174 }
 175
 176 static int acpt_free(BIO *a)
 177 {
 178     BIO_ACCEPT *data;
 179
 180     if (a == NULL)
 181         return (0);
 182     data = (BIO_ACCEPT *)a->ptr;
 183
 184     if (a->shutdown) {
 185         acpt_close_socket(a);
 186         BIO_ACCEPT_free(data);
 187         a->ptr = NULL;
 188         a->flags = 0;
 189         a->init = 0;
 190     }
 191     return (1);
 192 }
 193
 194 static int acpt_state(BIO *b, BIO_ACCEPT *c)
 195 {
 196     BIO *bio = NULL, *dbio;
 197     int s = -1;
 198     int i;
 199
 200  again:
 201     switch (c->state) {
 202     case ACPT_S_BEFORE:
 203         if (c->param_addr == NULL) {
 204             BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_PORT_SPECIFIED);
 205             return (-1);
 206         }
 207         s = BIO_get_accept_socket(c->param_addr, c->bind_mode);
 208         if (s == INVALID_SOCKET)
 209             return (-1);
 210
 211         if (c->accept_nbio) {
 212             if (!BIO_socket_nbio(s, 1)) {
 213                 closesocket(s);
 214                 BIOerr(BIO_F_ACPT_STATE,
 215                        BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
 216                 return (-1);
 217             }
 218         }
 219         c->accept_sock = s;
 220         b->num = s;
 221         c->state = ACPT_S_GET_ACCEPT_SOCKET;
 222         return (1);
 223         /* break; */
 224     case ACPT_S_GET_ACCEPT_SOCKET:
 225         if (b->next_bio != NULL) {
 226             c->state = ACPT_S_OK;
 227             goto again;
 228         }
 229         BIO_clear_retry_flags(b);
 230         b->retry_reason = 0;
 231         i = BIO_accept(c->accept_sock, &(c->addr));
 232
 233         /* -2 return means we should retry */
 234         if (i == -2) {
 235             BIO_set_retry_special(b);
 236             b->retry_reason = BIO_RR_ACCEPT;
 237             return -1;
 238         }
 239
 240         if (i < 0)
 241             return (i);
 242
 243         bio = BIO_new_socket(i, BIO_CLOSE);
 244         if (bio == NULL)
 245             goto err;
 246
 247         BIO_set_callback(bio, BIO_get_callback(b));
 248         BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
 249
 250         if (c->nbio) {
 251             if (!BIO_socket_nbio(i, 1)) {
 252                 BIOerr(BIO_F_ACPT_STATE,
 253                        BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
 254                 goto err;
 255             }
 256         }
 257
 258         /*
 259          * If the accept BIO has an bio_chain, we dup it and put the new
 260          * socket at the end.
 261          */
 262         if (c->bio_chain != NULL) {
 263             if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
 264                 goto err;
 265             if (!BIO_push(dbio, bio))
 266                 goto err;
 267             bio = dbio;
 268         }
 269         if (BIO_push(b, bio) == NULL)
 270             goto err;
 271
 272         c->state = ACPT_S_OK;
 273         return (1);
 274  err:
 275         if (bio != NULL)
 276             BIO_free(bio);
 277         else if (s >= 0)
 278             closesocket(s);
 279         return (0);
 280         /* break; */
 281     case ACPT_S_OK:
 282         if (b->next_bio == NULL) {
 283             c->state = ACPT_S_GET_ACCEPT_SOCKET;
 284             goto again;
 285         }
 286         return (1);
 287         /* break; */
 288     default:
 289         return (0);
 290         /* break; */
 291     }
 292
 293 }
 294
 295 static int acpt_read(BIO *b, char *out, int outl)
 296 {
 297     int ret = 0;
 298     BIO_ACCEPT *data;
 299
 300     BIO_clear_retry_flags(b);
 301     data = (BIO_ACCEPT *)b->ptr;
 302
 303     while (b->next_bio == NULL) {
 304         ret = acpt_state(b, data);
 305         if (ret <= 0)
 306             return (ret);
 307     }
 308
 309     ret = BIO_read(b->next_bio, out, outl);
 310     BIO_copy_next_retry(b);
 311     return (ret);
 312 }
 313
 314 static int acpt_write(BIO *b, const char *in, int inl)
 315 {
 316     int ret;
 317     BIO_ACCEPT *data;
 318
 319     BIO_clear_retry_flags(b);
 320     data = (BIO_ACCEPT *)b->ptr;
 321
 322     while (b->next_bio == NULL) {
 323         ret = acpt_state(b, data);
 324         if (ret <= 0)
 325             return (ret);
 326     }
 327
 328     ret = BIO_write(b->next_bio, in, inl);
 329     BIO_copy_next_retry(b);
 330     return (ret);
 331 }
 332
 333 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
 334 {
 335     int *ip;
 336     long ret = 1;
 337     BIO_ACCEPT *data;
 338     char **pp;
 339
 340     data = (BIO_ACCEPT *)b->ptr;
 341
 342     switch (cmd) {
 343     case BIO_CTRL_RESET:
 344         ret = 0;
 345         data->state = ACPT_S_BEFORE;
 346         acpt_close_socket(b);
 347         b->flags = 0;
 348         break;
 349     case BIO_C_DO_STATE_MACHINE:
 350         /* use this one to start the connection */
 351         ret = (long)acpt_state(b, data);
 352         break;
 353     case BIO_C_SET_ACCEPT:
 354         if (ptr != NULL) {
 355             if (num == 0) {
 356                 b->init = 1;
 357                 if (data->param_addr != NULL)
 358                     OPENSSL_free(data->param_addr);
 359                 data->param_addr = BUF_strdup(ptr);
 360             } else if (num == 1) {
 361                 data->accept_nbio = (ptr != NULL);
 362             } else if (num == 2) {
 363                 if (data->bio_chain != NULL)
 364                     BIO_free(data->bio_chain);
 365                 data->bio_chain = (BIO *)ptr;
 366             }
 367         }
 368         break;
 369     case BIO_C_SET_NBIO:
 370         data->nbio = (int)num;
 371         break;
 372     case BIO_C_SET_FD:
 373         b->init = 1;
 374         b->num = *((int *)ptr);
 375         data->accept_sock = b->num;
 376         data->state = ACPT_S_GET_ACCEPT_SOCKET;
 377         b->shutdown = (int)num;
 378         b->init = 1;
 379         break;
 380     case BIO_C_GET_FD:
 381         if (b->init) {
 382             ip = (int *)ptr;
 383             if (ip != NULL)
 384                 *ip = data->accept_sock;
 385             ret = data->accept_sock;
 386         } else
 387             ret = -1;
 388         break;
 389     case BIO_C_GET_ACCEPT:
 390         if (b->init) {
 391             if (ptr != NULL) {
 392                 pp = (char **)ptr;
 393                 *pp = data->param_addr;
 394             } else
 395                 ret = -1;
 396         } else
 397             ret = -1;
 398         break;
 399     case BIO_CTRL_GET_CLOSE:
 400         ret = b->shutdown;
 401         break;
 402     case BIO_CTRL_SET_CLOSE:
 403         b->shutdown = (int)num;
 404         break;
 405     case BIO_CTRL_PENDING:
 406     case BIO_CTRL_WPENDING:
 407         ret = 0;
 408         break;
 409     case BIO_CTRL_FLUSH:
 410         break;
 411     case BIO_C_SET_BIND_MODE:
 412         data->bind_mode = (int)num;
 413         break;
 414     case BIO_C_GET_BIND_MODE:
 415         ret = (long)data->bind_mode;
 416         break;
 417     case BIO_CTRL_DUP:
 418 /*-             dbio=(BIO *)ptr;
 419                 if (data->param_port) EAY EAY
 420                         BIO_set_port(dbio,data->param_port);
 421                 if (data->param_hostname)
 422                         BIO_set_hostname(dbio,data->param_hostname);
 423                 BIO_set_nbio(dbio,data->nbio); */
 424         break;
 425
 426     default:
 427         ret = 0;
 428         break;
 429     }
 430     return (ret);
 431 }
 432
 433 static int acpt_puts(BIO *bp, const char *str)
 434 {
 435     int n, ret;
 436
 437     n = strlen(str);
 438     ret = acpt_write(bp, str, n);
 439     return (ret);
 440 }
 441
 442 BIO *BIO_new_accept(const char *str)
 443 {
 444     BIO *ret;
 445
 446     ret = BIO_new(BIO_s_accept());
 447     if (ret == NULL)
 448         return (NULL);
 449     if (BIO_set_accept_port(ret, str))
 450         return (ret);
 451     else {
 452         BIO_free(ret);
 453         return (NULL);
 454     }
 455 }
 456
 457 #endif