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 "internal/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 = (int)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_zalloc(sizeof(*ret))) == NULL)
 141         return (NULL);
 142     ret->accept_sock = (int)INVALID_SOCKET;
 143     ret->bind_mode = BIO_BIND_NORMAL;
 144     return (ret);
 145 }
 146
 147 static void BIO_ACCEPT_free(BIO_ACCEPT *a)
 148 {
 149     if (a == NULL)
 150         return;
 151
 152     OPENSSL_free(a->param_addr);
 153     OPENSSL_free(a->addr);
 154     BIO_free(a->bio_chain);
 155     OPENSSL_free(a);
 156 }
 157
 158 static void acpt_close_socket(BIO *bio)
 159 {
 160     BIO_ACCEPT *c;
 161
 162     c = (BIO_ACCEPT *)bio->ptr;
 163     if (c->accept_sock != (int)INVALID_SOCKET) {
 164         shutdown(c->accept_sock, 2);
 165         closesocket(c->accept_sock);
 166         c->accept_sock = (int)INVALID_SOCKET;
 167         bio->num = (int)INVALID_SOCKET;
 168     }
 169 }
 170
 171 static int acpt_free(BIO *a)
 172 {
 173     BIO_ACCEPT *data;
 174
 175     if (a == NULL)
 176         return (0);
 177     data = (BIO_ACCEPT *)a->ptr;
 178
 179     if (a->shutdown) {
 180         acpt_close_socket(a);
 181         BIO_ACCEPT_free(data);
 182         a->ptr = NULL;
 183         a->flags = 0;
 184         a->init = 0;
 185     }
 186     return (1);
 187 }
 188
 189 static int acpt_state(BIO *b, BIO_ACCEPT *c)
 190 {
 191     BIO *bio = NULL, *dbio;
 192     int s = -1;
 193     int i;
 194
 195  again:
 196     switch (c->state) {
 197     case ACPT_S_BEFORE:
 198         if (c->param_addr == NULL) {
 199             BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_PORT_SPECIFIED);
 200             return (-1);
 201         }
 202         s = BIO_get_accept_socket(c->param_addr, c->bind_mode);
 203         if (s == (int)INVALID_SOCKET)
 204             return (-1);
 205
 206         if (c->accept_nbio) {
 207             if (!BIO_socket_nbio(s, 1)) {
 208                 closesocket(s);
 209                 BIOerr(BIO_F_ACPT_STATE,
 210                        BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
 211                 return (-1);
 212             }
 213         }
 214         c->accept_sock = s;
 215         b->num = s;
 216         c->state = ACPT_S_GET_ACCEPT_SOCKET;
 217         return (1);
 218         /* break; */
 219     case ACPT_S_GET_ACCEPT_SOCKET:
 220         if (b->next_bio != NULL) {
 221             c->state = ACPT_S_OK;
 222             goto again;
 223         }
 224         BIO_clear_retry_flags(b);
 225         b->retry_reason = 0;
 226         i = BIO_accept(c->accept_sock, &(c->addr));
 227
 228         /* -2 return means we should retry */
 229         if (i == -2) {
 230             BIO_set_retry_special(b);
 231             b->retry_reason = BIO_RR_ACCEPT;
 232             return -1;
 233         }
 234
 235         if (i < 0)
 236             return (i);
 237
 238         bio = BIO_new_socket(i, BIO_CLOSE);
 239         if (bio == NULL)
 240             goto err;
 241
 242         BIO_set_callback(bio, BIO_get_callback(b));
 243         BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
 244
 245         if (c->nbio) {
 246             if (!BIO_socket_nbio(i, 1)) {
 247                 BIOerr(BIO_F_ACPT_STATE,
 248                        BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
 249                 goto err;
 250             }
 251         }
 252
 253         /*
 254          * If the accept BIO has an bio_chain, we dup it and put the new
 255          * socket at the end.
 256          */
 257         if (c->bio_chain != NULL) {
 258             if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
 259                 goto err;
 260             if (!BIO_push(dbio, bio))
 261                 goto err;
 262             bio = dbio;
 263         }
 264         if (BIO_push(b, bio) == NULL)
 265             goto err;
 266
 267         c->state = ACPT_S_OK;
 268         return (1);
 269  err:
 270         if (bio != NULL)
 271             BIO_free(bio);
 272         else if (s >= 0)
 273             closesocket(s);
 274         return (0);
 275         /* break; */
 276     case ACPT_S_OK:
 277         if (b->next_bio == NULL) {
 278             c->state = ACPT_S_GET_ACCEPT_SOCKET;
 279             goto again;
 280         }
 281         return (1);
 282         /* break; */
 283     default:
 284         return (0);
 285         /* break; */
 286     }
 287
 288 }
 289
 290 static int acpt_read(BIO *b, char *out, int outl)
 291 {
 292     int ret = 0;
 293     BIO_ACCEPT *data;
 294
 295     BIO_clear_retry_flags(b);
 296     data = (BIO_ACCEPT *)b->ptr;
 297
 298     while (b->next_bio == NULL) {
 299         ret = acpt_state(b, data);
 300         if (ret <= 0)
 301             return (ret);
 302     }
 303
 304     ret = BIO_read(b->next_bio, out, outl);
 305     BIO_copy_next_retry(b);
 306     return (ret);
 307 }
 308
 309 static int acpt_write(BIO *b, const char *in, int inl)
 310 {
 311     int ret;
 312     BIO_ACCEPT *data;
 313
 314     BIO_clear_retry_flags(b);
 315     data = (BIO_ACCEPT *)b->ptr;
 316
 317     while (b->next_bio == NULL) {
 318         ret = acpt_state(b, data);
 319         if (ret <= 0)
 320             return (ret);
 321     }
 322
 323     ret = BIO_write(b->next_bio, in, inl);
 324     BIO_copy_next_retry(b);
 325     return (ret);
 326 }
 327
 328 static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
 329 {
 330     int *ip;
 331     long ret = 1;
 332     BIO_ACCEPT *data;
 333     char **pp;
 334
 335     data = (BIO_ACCEPT *)b->ptr;
 336
 337     switch (cmd) {
 338     case BIO_CTRL_RESET:
 339         ret = 0;
 340         data->state = ACPT_S_BEFORE;
 341         acpt_close_socket(b);
 342         b->flags = 0;
 343         break;
 344     case BIO_C_DO_STATE_MACHINE:
 345         /* use this one to start the connection */
 346         ret = (long)acpt_state(b, data);
 347         break;
 348     case BIO_C_SET_ACCEPT:
 349         if (ptr != NULL) {
 350             if (num == 0) {
 351                 b->init = 1;
 352                 OPENSSL_free(data->param_addr);
 353                 data->param_addr = OPENSSL_strdup(ptr);
 354             } else if (num == 1) {
 355                 data->accept_nbio = (ptr != NULL);
 356             } else if (num == 2) {
 357                 BIO_free(data->bio_chain);
 358                 data->bio_chain = (BIO *)ptr;
 359             }
 360         }
 361         break;
 362     case BIO_C_SET_NBIO:
 363         data->nbio = (int)num;
 364         break;
 365     case BIO_C_SET_FD:
 366         b->init = 1;
 367         b->num = *((int *)ptr);
 368         data->accept_sock = b->num;
 369         data->state = ACPT_S_GET_ACCEPT_SOCKET;
 370         b->shutdown = (int)num;
 371         b->init = 1;
 372         break;
 373     case BIO_C_GET_FD:
 374         if (b->init) {
 375             ip = (int *)ptr;
 376             if (ip != NULL)
 377                 *ip = data->accept_sock;
 378             ret = data->accept_sock;
 379         } else
 380             ret = -1;
 381         break;
 382     case BIO_C_GET_ACCEPT:
 383         if (b->init) {
 384             if (ptr != NULL) {
 385                 pp = (char **)ptr;
 386                 *pp = data->param_addr;
 387             } else
 388                 ret = -1;
 389         } else
 390             ret = -1;
 391         break;
 392     case BIO_CTRL_GET_CLOSE:
 393         ret = b->shutdown;
 394         break;
 395     case BIO_CTRL_SET_CLOSE:
 396         b->shutdown = (int)num;
 397         break;
 398     case BIO_CTRL_PENDING:
 399     case BIO_CTRL_WPENDING:
 400         ret = 0;
 401         break;
 402     case BIO_CTRL_FLUSH:
 403         break;
 404     case BIO_C_SET_BIND_MODE:
 405         data->bind_mode = (int)num;
 406         break;
 407     case BIO_C_GET_BIND_MODE:
 408         ret = (long)data->bind_mode;
 409         break;
 410     case BIO_CTRL_DUP:
 411 /*-     dbio=(BIO *)ptr;
 412         if (data->param_port) EAY EAY
 413                 BIO_set_port(dbio,data->param_port);
 414         if (data->param_hostname)
 415                 BIO_set_hostname(dbio,data->param_hostname);
 416         BIO_set_nbio(dbio,data->nbio); */
 417         break;
 418
 419     default:
 420         ret = 0;
 421         break;
 422     }
 423     return (ret);
 424 }
 425
 426 static int acpt_puts(BIO *bp, const char *str)
 427 {
 428     int n, ret;
 429
 430     n = strlen(str);
 431     ret = acpt_write(bp, str, n);
 432     return (ret);
 433 }
 434
 435 BIO *BIO_new_accept(const char *str)
 436 {
 437     BIO *ret;
 438
 439     ret = BIO_new(BIO_s_accept());
 440     if (ret == NULL)
 441         return (NULL);
 442     if (BIO_set_accept_port(ret, str))
 443         return (ret);
 444     BIO_free(ret);
 445     return (NULL);
 446 }
 447
 448 #endif