crypto/bio/bss_conn.c

   1 /* crypto/bio/bss_conn.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_connect_st {
  73     int state;
  74     char *param_hostname;
  75     char *param_port;
  76     int nbio;
  77     unsigned char ip[4];
  78     unsigned short port;
  79     struct sockaddr_in them;
  80     /*
  81      * int socket; this will be kept in bio->num so that it is compatible
  82      * with the bss_sock bio
  83      */
  84     /*
  85      * called when the connection is initially made callback(BIO,state,ret);
  86      * The callback should return 'ret'.  state is for compatibility with the
  87      * ssl info_callback
  88      */
  89     int (*info_callback) (const BIO *bio, int state, int ret);
  90 } BIO_CONNECT;
  91
  92 static int conn_write(BIO *h, const char *buf, int num);
  93 static int conn_read(BIO *h, char *buf, int size);
  94 static int conn_puts(BIO *h, const char *str);
  95 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  96 static int conn_new(BIO *h);
  97 static int conn_free(BIO *data);
  98 static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
  99
 100 static int conn_state(BIO *b, BIO_CONNECT *c);
 101 static void conn_close_socket(BIO *data);
 102 BIO_CONNECT *BIO_CONNECT_new(void);
 103 void BIO_CONNECT_free(BIO_CONNECT *a);
 104
 105 static BIO_METHOD methods_connectp = {
 106     BIO_TYPE_CONNECT,
 107     "socket connect",
 108     conn_write,
 109     conn_read,
 110     conn_puts,
 111     NULL,                       /* connect_gets, */
 112     conn_ctrl,
 113     conn_new,
 114     conn_free,
 115     conn_callback_ctrl,
 116 };
 117
 118 static int conn_state(BIO *b, BIO_CONNECT *c)
 119 {
 120     int ret = -1, i;
 121     unsigned long l;
 122     char *p, *q;
 123     int (*cb) (const BIO *, int, int) = NULL;
 124
 125     if (c->info_callback != NULL)
 126         cb = c->info_callback;
 127
 128     for (;;) {
 129         switch (c->state) {
 130         case BIO_CONN_S_BEFORE:
 131             p = c->param_hostname;
 132             if (p == NULL) {
 133                 BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_SPECIFIED);
 134                 goto exit_loop;
 135             }
 136             for (; *p != '\0'; p++) {
 137                 if ((*p == ':') || (*p == '/'))
 138                     break;
 139             }
 140
 141             i = *p;
 142             if ((i == ':') || (i == '/')) {
 143
 144                 *(p++) = '\0';
 145                 if (i == ':') {
 146                     for (q = p; *q; q++)
 147                         if (*q == '/') {
 148                             *q = '\0';
 149                             break;
 150                         }
 151                     OPENSSL_free(c->param_port);
 152                     c->param_port = OPENSSL_strdup(p);
 153                 }
 154             }
 155
 156             if (c->param_port == NULL) {
 157                 BIOerr(BIO_F_CONN_STATE, BIO_R_NO_PORT_SPECIFIED);
 158                 ERR_add_error_data(2, "host=", c->param_hostname);
 159                 goto exit_loop;
 160             }
 161             c->state = BIO_CONN_S_GET_IP;
 162             break;
 163
 164         case BIO_CONN_S_GET_IP:
 165             if (BIO_get_host_ip(c->param_hostname, &(c->ip[0])) <= 0)
 166                 goto exit_loop;
 167             c->state = BIO_CONN_S_GET_PORT;
 168             break;
 169
 170         case BIO_CONN_S_GET_PORT:
 171             if (c->param_port == NULL) {
 172                 /* abort(); */
 173                 goto exit_loop;
 174             } else if (BIO_get_port(c->param_port, &c->port) <= 0)
 175                 goto exit_loop;
 176             c->state = BIO_CONN_S_CREATE_SOCKET;
 177             break;
 178
 179         case BIO_CONN_S_CREATE_SOCKET:
 180             /* now setup address */
 181             memset(&c->them, 0, sizeof(c->them));
 182             c->them.sin_family = AF_INET;
 183             c->them.sin_port = htons((unsigned short)c->port);
 184             l = (unsigned long)
 185                 ((unsigned long)c->ip[0] << 24L) |
 186                 ((unsigned long)c->ip[1] << 16L) |
 187                 ((unsigned long)c->ip[2] << 8L) | ((unsigned long)c->ip[3]);
 188             c->them.sin_addr.s_addr = htonl(l);
 189             c->state = BIO_CONN_S_CREATE_SOCKET;
 190
 191             ret = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 192             if (ret == (int)INVALID_SOCKET) {
 193                 SYSerr(SYS_F_SOCKET, get_last_socket_error());
 194                 ERR_add_error_data(4, "host=", c->param_hostname,
 195                                    ":", c->param_port);
 196                 BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
 197                 goto exit_loop;
 198             }
 199             b->num = ret;
 200             c->state = BIO_CONN_S_NBIO;
 201             break;
 202
 203         case BIO_CONN_S_NBIO:
 204             if (c->nbio) {
 205                 if (!BIO_socket_nbio(b->num, 1)) {
 206                     BIOerr(BIO_F_CONN_STATE, BIO_R_ERROR_SETTING_NBIO);
 207                     ERR_add_error_data(4, "host=",
 208                                        c->param_hostname, ":", c->param_port);
 209                     goto exit_loop;
 210                 }
 211             }
 212             c->state = BIO_CONN_S_CONNECT;
 213
 214 # if defined(SO_KEEPALIVE)
 215             i = 1;
 216             i = setsockopt(b->num, SOL_SOCKET, SO_KEEPALIVE, (char *)&i,
 217                            sizeof(i));
 218             if (i < 0) {
 219                 SYSerr(SYS_F_SOCKET, get_last_socket_error());
 220                 ERR_add_error_data(4, "host=", c->param_hostname,
 221                                    ":", c->param_port);
 222                 BIOerr(BIO_F_CONN_STATE, BIO_R_KEEPALIVE);
 223                 goto exit_loop;
 224             }
 225 # endif
 226             break;
 227
 228         case BIO_CONN_S_CONNECT:
 229             BIO_clear_retry_flags(b);
 230             ret = connect(b->num,
 231                           (struct sockaddr *)&c->them, sizeof(c->them));
 232             b->retry_reason = 0;
 233             if (ret < 0) {
 234                 if (BIO_sock_should_retry(ret)) {
 235                     BIO_set_retry_special(b);
 236                     c->state = BIO_CONN_S_BLOCKED_CONNECT;
 237                     b->retry_reason = BIO_RR_CONNECT;
 238                 } else {
 239                     SYSerr(SYS_F_CONNECT, get_last_socket_error());
 240                     ERR_add_error_data(4, "host=",
 241                                        c->param_hostname, ":", c->param_port);
 242                     BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
 243                 }
 244                 goto exit_loop;
 245             } else
 246                 c->state = BIO_CONN_S_OK;
 247             break;
 248
 249         case BIO_CONN_S_BLOCKED_CONNECT:
 250             i = BIO_sock_error(b->num);
 251             if (i) {
 252                 BIO_clear_retry_flags(b);
 253                 SYSerr(SYS_F_CONNECT, i);
 254                 ERR_add_error_data(4, "host=",
 255                                    c->param_hostname, ":", c->param_port);
 256                 BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
 257                 ret = 0;
 258                 goto exit_loop;
 259             } else
 260                 c->state = BIO_CONN_S_OK;
 261             break;
 262
 263         case BIO_CONN_S_OK:
 264             ret = 1;
 265             goto exit_loop;
 266         default:
 267             /* abort(); */
 268             goto exit_loop;
 269         }
 270
 271         if (cb != NULL) {
 272             if ((ret = cb((BIO *)b, c->state, ret)) == 0)
 273                 goto end;
 274         }
 275     }
 276
 277     /* Loop does not exit */
 278  exit_loop:
 279     if (cb != NULL)
 280         ret = cb((BIO *)b, c->state, ret);
 281  end:
 282     return (ret);
 283 }
 284
 285 BIO_CONNECT *BIO_CONNECT_new(void)
 286 {
 287     BIO_CONNECT *ret;
 288
 289     if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
 290         return (NULL);
 291     ret->state = BIO_CONN_S_BEFORE;
 292     ret->param_hostname = NULL;
 293     ret->param_port = NULL;
 294     ret->info_callback = NULL;
 295     return (ret);
 296 }
 297
 298 void BIO_CONNECT_free(BIO_CONNECT *a)
 299 {
 300     if (a == NULL)
 301         return;
 302
 303     OPENSSL_free(a->param_hostname);
 304     OPENSSL_free(a->param_port);
 305     OPENSSL_free(a);
 306 }
 307
 308 BIO_METHOD *BIO_s_connect(void)
 309 {
 310     return (&methods_connectp);
 311 }
 312
 313 static int conn_new(BIO *bi)
 314 {
 315     bi->init = 0;
 316     bi->num = (int)INVALID_SOCKET;
 317     bi->flags = 0;
 318     if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
 319         return (0);
 320     else
 321         return (1);
 322 }
 323
 324 static void conn_close_socket(BIO *bio)
 325 {
 326     BIO_CONNECT *c;
 327
 328     c = (BIO_CONNECT *)bio->ptr;
 329     if (bio->num != (int)INVALID_SOCKET) {
 330         /* Only do a shutdown if things were established */
 331         if (c->state == BIO_CONN_S_OK)
 332             shutdown(bio->num, 2);
 333         closesocket(bio->num);
 334         bio->num = (int)INVALID_SOCKET;
 335     }
 336 }
 337
 338 static int conn_free(BIO *a)
 339 {
 340     BIO_CONNECT *data;
 341
 342     if (a == NULL)
 343         return (0);
 344     data = (BIO_CONNECT *)a->ptr;
 345
 346     if (a->shutdown) {
 347         conn_close_socket(a);
 348         BIO_CONNECT_free(data);
 349         a->ptr = NULL;
 350         a->flags = 0;
 351         a->init = 0;
 352     }
 353     return (1);
 354 }
 355
 356 static int conn_read(BIO *b, char *out, int outl)
 357 {
 358     int ret = 0;
 359     BIO_CONNECT *data;
 360
 361     data = (BIO_CONNECT *)b->ptr;
 362     if (data->state != BIO_CONN_S_OK) {
 363         ret = conn_state(b, data);
 364         if (ret <= 0)
 365             return (ret);
 366     }
 367
 368     if (out != NULL) {
 369         clear_socket_error();
 370         ret = readsocket(b->num, out, outl);
 371         BIO_clear_retry_flags(b);
 372         if (ret <= 0) {
 373             if (BIO_sock_should_retry(ret))
 374                 BIO_set_retry_read(b);
 375         }
 376     }
 377     return (ret);
 378 }
 379
 380 static int conn_write(BIO *b, const char *in, int inl)
 381 {
 382     int ret;
 383     BIO_CONNECT *data;
 384
 385     data = (BIO_CONNECT *)b->ptr;
 386     if (data->state != BIO_CONN_S_OK) {
 387         ret = conn_state(b, data);
 388         if (ret <= 0)
 389             return (ret);
 390     }
 391
 392     clear_socket_error();
 393     ret = writesocket(b->num, in, inl);
 394     BIO_clear_retry_flags(b);
 395     if (ret <= 0) {
 396         if (BIO_sock_should_retry(ret))
 397             BIO_set_retry_write(b);
 398     }
 399     return (ret);
 400 }
 401
 402 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 403 {
 404     BIO *dbio;
 405     int *ip;
 406     const char **pptr = NULL;
 407     long ret = 1;
 408     BIO_CONNECT *data;
 409
 410     data = (BIO_CONNECT *)b->ptr;
 411
 412     switch (cmd) {
 413     case BIO_CTRL_RESET:
 414         ret = 0;
 415         data->state = BIO_CONN_S_BEFORE;
 416         conn_close_socket(b);
 417         b->flags = 0;
 418         break;
 419     case BIO_C_DO_STATE_MACHINE:
 420         /* use this one to start the connection */
 421         if (data->state != BIO_CONN_S_OK)
 422             ret = (long)conn_state(b, data);
 423         else
 424             ret = 1;
 425         break;
 426     case BIO_C_GET_CONNECT:
 427         if (ptr != NULL) {
 428             pptr = (const char **)ptr;
 429         }
 430
 431         if (b->init) {
 432             if (pptr != NULL) {
 433                 ret = 1;
 434                 if (num == 0) {
 435                     *pptr = data->param_hostname;
 436                 } else if (num == 1) {
 437                     *pptr = data->param_port;
 438                 } else if (num == 2) {
 439                     *pptr = (char *)&(data->ip[0]);
 440                 } else {
 441                     ret = 0;
 442                 }
 443             }
 444             if (num == 3) {
 445                 ret = data->port;
 446             }
 447         } else {
 448             if (pptr != NULL)
 449                 *pptr = "not initialized";
 450             ret = 0;
 451         }
 452         break;
 453     case BIO_C_SET_CONNECT:
 454         if (ptr != NULL) {
 455             b->init = 1;
 456             if (num == 0) {
 457                 OPENSSL_free(data->param_hostname);
 458                 data->param_hostname = OPENSSL_strdup(ptr);
 459             } else if (num == 1) {
 460                 OPENSSL_free(data->param_port);
 461                 data->param_port = OPENSSL_strdup(ptr);
 462             } else if (num == 2) {
 463                 char buf[16];
 464                 unsigned char *p = ptr;
 465
 466                 BIO_snprintf(buf, sizeof buf, "%d.%d.%d.%d",
 467                              p[0], p[1], p[2], p[3]);
 468                 OPENSSL_free(data->param_hostname);
 469                 data->param_hostname = OPENSSL_strdup(buf);
 470                 memcpy(&(data->ip[0]), ptr, 4);
 471             } else if (num == 3) {
 472                 char buf[DECIMAL_SIZE(int) + 1];
 473
 474                 BIO_snprintf(buf, sizeof buf, "%d", *(int *)ptr);
 475                 OPENSSL_free(data->param_port);
 476                 data->param_port = OPENSSL_strdup(buf);
 477                 data->port = *(int *)ptr;
 478             }
 479         }
 480         break;
 481     case BIO_C_SET_NBIO:
 482         data->nbio = (int)num;
 483         break;
 484     case BIO_C_GET_FD:
 485         if (b->init) {
 486             ip = (int *)ptr;
 487             if (ip != NULL)
 488                 *ip = b->num;
 489             ret = b->num;
 490         } else
 491             ret = -1;
 492         break;
 493     case BIO_CTRL_GET_CLOSE:
 494         ret = b->shutdown;
 495         break;
 496     case BIO_CTRL_SET_CLOSE:
 497         b->shutdown = (int)num;
 498         break;
 499     case BIO_CTRL_PENDING:
 500     case BIO_CTRL_WPENDING:
 501         ret = 0;
 502         break;
 503     case BIO_CTRL_FLUSH:
 504         break;
 505     case BIO_CTRL_DUP:
 506         {
 507             dbio = (BIO *)ptr;
 508             if (data->param_port)
 509                 BIO_set_conn_port(dbio, data->param_port);
 510             if (data->param_hostname)
 511                 BIO_set_conn_hostname(dbio, data->param_hostname);
 512             BIO_set_nbio(dbio, data->nbio);
 513             /*
 514              * FIXME: the cast of the function seems unlikely to be a good
 515              * idea
 516              */
 517             (void)BIO_set_info_callback(dbio,
 518                                         (bio_info_cb *)data->info_callback);
 519         }
 520         break;
 521     case BIO_CTRL_SET_CALLBACK:
 522         {
 523 # if 0                          /* FIXME: Should this be used? -- Richard
 524                                  * Levitte */
 525             BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 526             ret = -1;
 527 # else
 528             ret = 0;
 529 # endif
 530         }
 531         break;
 532     case BIO_CTRL_GET_CALLBACK:
 533         {
 534             int (**fptr) (const BIO *bio, int state, int xret);
 535
 536             fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
 537             *fptr = data->info_callback;
 538         }
 539         break;
 540     default:
 541         ret = 0;
 542         break;
 543     }
 544     return (ret);
 545 }
 546
 547 static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 548 {
 549     long ret = 1;
 550     BIO_CONNECT *data;
 551
 552     data = (BIO_CONNECT *)b->ptr;
 553
 554     switch (cmd) {
 555     case BIO_CTRL_SET_CALLBACK:
 556         {
 557             data->info_callback =
 558                 (int (*)(const struct bio_st *, int, int))fp;
 559         }
 560         break;
 561     default:
 562         ret = 0;
 563         break;
 564     }
 565     return (ret);
 566 }
 567
 568 static int conn_puts(BIO *bp, const char *str)
 569 {
 570     int n, ret;
 571
 572     n = strlen(str);
 573     ret = conn_write(bp, str, n);
 574     return (ret);
 575 }
 576
 577 BIO *BIO_new_connect(const char *str)
 578 {
 579     BIO *ret;
 580
 581     ret = BIO_new(BIO_s_connect());
 582     if (ret == NULL)
 583         return (NULL);
 584     if (BIO_set_conn_hostname(ret, str))
 585         return (ret);
 586     BIO_free(ret);
 587     return (NULL);
 588 }
 589
 590 #endif