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 "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
  73 typedef struct bio_connect_st
  74         {
  75         int state;
  76
  77         char *param_hostname;
  78         char *param_port;
  79         int nbio;
  80
  81         unsigned char ip[4];
  82         unsigned short port;
  83
  84         struct sockaddr_in them;
  85
  86         /* int socket; this will be kept in bio->num so that it is
  87          * compatible with the bss_sock bio */
  88
  89         /* called when the connection is initially made
  90          *  callback(BIO,state,ret);  The callback should return
  91          * 'ret'.  state is for compatibility with the ssl info_callback */
  92         int (*info_callback)(const BIO *bio,int state,int ret);
  93         } BIO_CONNECT;
  94
  95 static int conn_write(BIO *h, const char *buf, int num);
  96 static int conn_read(BIO *h, char *buf, int size);
  97 static int conn_puts(BIO *h, const char *str);
  98 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  99 static int conn_new(BIO *h);
 100 static int conn_free(BIO *data);
 101 static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
 102
 103 static int conn_state(BIO *b, BIO_CONNECT *c);
 104 static void conn_close_socket(BIO *data);
 105 BIO_CONNECT *BIO_CONNECT_new(void );
 106 void BIO_CONNECT_free(BIO_CONNECT *a);
 107
 108 static BIO_METHOD methods_connectp=
 109         {
 110         BIO_TYPE_CONNECT,
 111         "socket connect",
 112         conn_write,
 113         conn_read,
 114         conn_puts,
 115         NULL, /* connect_gets, */
 116         conn_ctrl,
 117         conn_new,
 118         conn_free,
 119         conn_callback_ctrl,
 120         };
 121
 122 static int conn_state(BIO *b, BIO_CONNECT *c)
 123         {
 124         int ret= -1,i;
 125         unsigned long l;
 126         char *p,*q;
 127         int (*cb)(const BIO *,int,int)=NULL;
 128
 129         if (c->info_callback != NULL)
 130                 cb=c->info_callback;
 131
 132         for (;;)
 133                 {
 134                 switch (c->state)
 135                         {
 136                 case BIO_CONN_S_BEFORE:
 137                         p=c->param_hostname;
 138                         if (p == NULL)
 139                                 {
 140                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NO_HOSTNAME_SPECIFIED);
 141                                 goto exit_loop;
 142                                 }
 143                         for ( ; *p != '\0'; p++)
 144                                 {
 145                                 if ((*p == ':') || (*p == '/')) break;
 146                                 }
 147
 148                         i= *p;
 149                         if ((i == ':') || (i == '/'))
 150                                 {
 151
 152                                 *(p++)='\0';
 153                                 if (i == ':')
 154                                         {
 155                                         for (q=p; *q; q++)
 156                                                 if (*q == '/')
 157                                                         {
 158                                                         *q='\0';
 159                                                         break;
 160                                                         }
 161                                         if (c->param_port != NULL)
 162                                                 OPENSSL_free(c->param_port);
 163                                         c->param_port=BUF_strdup(p);
 164                                         }
 165                                 }
 166
 167                         if (c->param_port == NULL)
 168                                 {
 169                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NO_PORT_SPECIFIED);
 170                                 ERR_add_error_data(2,"host=",c->param_hostname);
 171                                 goto exit_loop;
 172                                 }
 173                         c->state=BIO_CONN_S_GET_IP;
 174                         break;
 175
 176                 case BIO_CONN_S_GET_IP:
 177                         if (BIO_get_host_ip(c->param_hostname,&(c->ip[0])) <= 0)
 178                                 goto exit_loop;
 179                         c->state=BIO_CONN_S_GET_PORT;
 180                         break;
 181
 182                 case BIO_CONN_S_GET_PORT:
 183                         if (c->param_port == NULL)
 184                                 {
 185                                 /* abort(); */
 186                                 goto exit_loop;
 187                                 }
 188                         else if (BIO_get_port(c->param_port,&c->port) <= 0)
 189                                 goto exit_loop;
 190                         c->state=BIO_CONN_S_CREATE_SOCKET;
 191                         break;
 192
 193                 case BIO_CONN_S_CREATE_SOCKET:
 194                         /* now setup address */
 195                         memset((char *)&c->them,0,sizeof(c->them));
 196                         c->them.sin_family=AF_INET;
 197                         c->them.sin_port=htons((unsigned short)c->port);
 198                         l=(unsigned long)
 199                                 ((unsigned long)c->ip[0]<<24L)|
 200                                 ((unsigned long)c->ip[1]<<16L)|
 201                                 ((unsigned long)c->ip[2]<< 8L)|
 202                                 ((unsigned long)c->ip[3]);
 203                         c->them.sin_addr.s_addr=htonl(l);
 204                         c->state=BIO_CONN_S_CREATE_SOCKET;
 205
 206                         ret=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
 207                         if (ret == INVALID_SOCKET)
 208                                 {
 209                                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 210                                 ERR_add_error_data(4,"host=",c->param_hostname,
 211                                         ":",c->param_port);
 212                                 BIOerr(BIO_F_CONN_STATE,BIO_R_UNABLE_TO_CREATE_SOCKET);
 213                                 goto exit_loop;
 214                                 }
 215                         b->num=ret;
 216                         c->state=BIO_CONN_S_NBIO;
 217                         break;
 218
 219                 case BIO_CONN_S_NBIO:
 220                         if (c->nbio)
 221                                 {
 222                                 if (!BIO_socket_nbio(b->num,1))
 223                                         {
 224                                         BIOerr(BIO_F_CONN_STATE,BIO_R_ERROR_SETTING_NBIO);
 225                                         ERR_add_error_data(4,"host=",
 226                                                 c->param_hostname,
 227                                                 ":",c->param_port);
 228                                         goto exit_loop;
 229                                         }
 230                                 }
 231                         c->state=BIO_CONN_S_CONNECT;
 232
 233 #if defined(SO_KEEPALIVE)
 234                         i=1;
 235                         i=setsockopt(b->num,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 236                         if (i < 0)
 237                                 {
 238                                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 239                                 ERR_add_error_data(4,"host=",c->param_hostname,
 240                                         ":",c->param_port);
 241                                 BIOerr(BIO_F_CONN_STATE,BIO_R_KEEPALIVE);
 242                                 goto exit_loop;
 243                                 }
 244 #endif
 245                         break;
 246
 247                 case BIO_CONN_S_CONNECT:
 248                         BIO_clear_retry_flags(b);
 249                         ret=connect(b->num,
 250                                 (struct sockaddr *)&c->them,
 251                                 sizeof(c->them));
 252                         b->retry_reason=0;
 253                         if (ret < 0)
 254                                 {
 255                                 if (BIO_sock_should_retry(ret))
 256                                         {
 257                                         BIO_set_retry_special(b);
 258                                         c->state=BIO_CONN_S_BLOCKED_CONNECT;
 259                                         b->retry_reason=BIO_RR_CONNECT;
 260                                         }
 261                                 else
 262                                         {
 263                                         SYSerr(SYS_F_CONNECT,get_last_socket_error());
 264                                         ERR_add_error_data(4,"host=",
 265                                                 c->param_hostname,
 266                                                 ":",c->param_port);
 267                                         BIOerr(BIO_F_CONN_STATE,BIO_R_CONNECT_ERROR);
 268                                         }
 269                                 goto exit_loop;
 270                                 }
 271                         else
 272                                 c->state=BIO_CONN_S_OK;
 273                         break;
 274
 275                 case BIO_CONN_S_BLOCKED_CONNECT:
 276                         i=BIO_sock_error(b->num);
 277                         if (i)
 278                                 {
 279                                 BIO_clear_retry_flags(b);
 280                                 SYSerr(SYS_F_CONNECT,i);
 281                                 ERR_add_error_data(4,"host=",
 282                                         c->param_hostname,
 283                                         ":",c->param_port);
 284                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NBIO_CONNECT_ERROR);
 285                                 ret=0;
 286                                 goto exit_loop;
 287                                 }
 288                         else
 289                                 c->state=BIO_CONN_S_OK;
 290                         break;
 291
 292                 case BIO_CONN_S_OK:
 293                         ret=1;
 294                         goto exit_loop;
 295                 default:
 296                         /* abort(); */
 297                         goto exit_loop;
 298                         }
 299
 300                 if (cb != NULL)
 301                         {
 302                         if (!(ret=cb((BIO *)b,c->state,ret)))
 303                                 goto end;
 304                         }
 305                 }
 306
 307         /* Loop does not exit */
 308 exit_loop:
 309         if (cb != NULL)
 310                 ret=cb((BIO *)b,c->state,ret);
 311 end:
 312         return(ret);
 313         }
 314
 315 BIO_CONNECT *BIO_CONNECT_new(void)
 316         {
 317         BIO_CONNECT *ret;
 318
 319         if ((ret=(BIO_CONNECT *)OPENSSL_malloc(sizeof(BIO_CONNECT))) == NULL)
 320                 return(NULL);
 321         ret->state=BIO_CONN_S_BEFORE;
 322         ret->param_hostname=NULL;
 323         ret->param_port=NULL;
 324         ret->info_callback=NULL;
 325         ret->nbio=0;
 326         ret->ip[0]=0;
 327         ret->ip[1]=0;
 328         ret->ip[2]=0;
 329         ret->ip[3]=0;
 330         ret->port=0;
 331         memset((char *)&ret->them,0,sizeof(ret->them));
 332         return(ret);
 333         }
 334
 335 void BIO_CONNECT_free(BIO_CONNECT *a)
 336         {
 337         if(a == NULL)
 338             return;
 339
 340         if (a->param_hostname != NULL)
 341                 OPENSSL_free(a->param_hostname);
 342         if (a->param_port != NULL)
 343                 OPENSSL_free(a->param_port);
 344         OPENSSL_free(a);
 345         }
 346
 347 BIO_METHOD *BIO_s_connect(void)
 348         {
 349         return(&methods_connectp);
 350         }
 351
 352 static int conn_new(BIO *bi)
 353         {
 354         bi->init=0;
 355         bi->num=INVALID_SOCKET;
 356         bi->flags=0;
 357         if ((bi->ptr=(char *)BIO_CONNECT_new()) == NULL)
 358                 return(0);
 359         else
 360                 return(1);
 361         }
 362
 363 static void conn_close_socket(BIO *bio)
 364         {
 365         BIO_CONNECT *c;
 366
 367         c=(BIO_CONNECT *)bio->ptr;
 368         if (bio->num != INVALID_SOCKET)
 369                 {
 370                 /* Only do a shutdown if things were established */
 371                 if (c->state == BIO_CONN_S_OK)
 372                         shutdown(bio->num,2);
 373                 closesocket(bio->num);
 374                 bio->num=INVALID_SOCKET;
 375                 }
 376         }
 377
 378 static int conn_free(BIO *a)
 379         {
 380         BIO_CONNECT *data;
 381
 382         if (a == NULL) return(0);
 383         data=(BIO_CONNECT *)a->ptr;
 384
 385         if (a->shutdown)
 386                 {
 387                 conn_close_socket(a);
 388                 BIO_CONNECT_free(data);
 389                 a->ptr=NULL;
 390                 a->flags=0;
 391                 a->init=0;
 392                 }
 393         return(1);
 394         }
 395
 396 static int conn_read(BIO *b, char *out, int outl)
 397         {
 398         int ret=0;
 399         BIO_CONNECT *data;
 400
 401         data=(BIO_CONNECT *)b->ptr;
 402         if (data->state != BIO_CONN_S_OK)
 403                 {
 404                 ret=conn_state(b,data);
 405                 if (ret <= 0)
 406                                 return(ret);
 407                 }
 408
 409         if (out != NULL)
 410                 {
 411                 clear_socket_error();
 412                 ret=readsocket(b->num,out,outl);
 413                 BIO_clear_retry_flags(b);
 414                 if (ret <= 0)
 415                         {
 416                         if (BIO_sock_should_retry(ret))
 417                                 BIO_set_retry_read(b);
 418                         }
 419                 }
 420         return(ret);
 421         }
 422
 423 static int conn_write(BIO *b, const char *in, int inl)
 424         {
 425         int ret;
 426         BIO_CONNECT *data;
 427
 428         data=(BIO_CONNECT *)b->ptr;
 429         if (data->state != BIO_CONN_S_OK)
 430                 {
 431                 ret=conn_state(b,data);
 432                 if (ret <= 0) return(ret);
 433                 }
 434
 435         clear_socket_error();
 436         ret=writesocket(b->num,in,inl);
 437         BIO_clear_retry_flags(b);
 438         if (ret <= 0)
 439                 {
 440                 if (BIO_sock_should_retry(ret))
 441                         BIO_set_retry_write(b);
 442                 }
 443         return(ret);
 444         }
 445
 446 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 447         {
 448         BIO *dbio;
 449         int *ip;
 450         const char **pptr;
 451         long ret=1;
 452         BIO_CONNECT *data;
 453
 454         data=(BIO_CONNECT *)b->ptr;
 455
 456         switch (cmd)
 457                 {
 458         case BIO_CTRL_RESET:
 459                 ret=0;
 460                 data->state=BIO_CONN_S_BEFORE;
 461                 conn_close_socket(b);
 462                 b->flags=0;
 463                 break;
 464         case BIO_C_DO_STATE_MACHINE:
 465                 /* use this one to start the connection */
 466                 if (data->state != BIO_CONN_S_OK)
 467                         ret=(long)conn_state(b,data);
 468                 else
 469                         ret=1;
 470                 break;
 471         case BIO_C_GET_CONNECT:
 472                 if (ptr != NULL)
 473                         {
 474                         pptr=(const char **)ptr;
 475                         if (num == 0)
 476                                 {
 477                                 *pptr=data->param_hostname;
 478
 479                                 }
 480                         else if (num == 1)
 481                                 {
 482                                 *pptr=data->param_port;
 483                                 }
 484                         else if (num == 2)
 485                                 {
 486                                 *pptr= (char *)&(data->ip[0]);
 487                                 }
 488                         else if (num == 3)
 489                                 {
 490                                 *((int *)ptr)=data->port;
 491                                 }
 492                         if ((!b->init) || (ptr == NULL))
 493                                 *pptr="not initialized";
 494                         ret=1;
 495                         }
 496                 break;
 497         case BIO_C_SET_CONNECT:
 498                 if (ptr != NULL)
 499                         {
 500                         b->init=1;
 501                         if (num == 0)
 502                                 {
 503                                 if (data->param_hostname != NULL)
 504                                         OPENSSL_free(data->param_hostname);
 505                                 data->param_hostname=BUF_strdup(ptr);
 506                                 }
 507                         else if (num == 1)
 508                                 {
 509                                 if (data->param_port != NULL)
 510                                         OPENSSL_free(data->param_port);
 511                                 data->param_port=BUF_strdup(ptr);
 512                                 }
 513                         else if (num == 2)
 514                                 {
 515                                 char buf[16];
 516                                 unsigned char *p = ptr;
 517
 518                                 BIO_snprintf(buf,sizeof buf,"%d.%d.%d.%d",
 519                                              p[0],p[1],p[2],p[3]);
 520                                 if (data->param_hostname != NULL)
 521                                         OPENSSL_free(data->param_hostname);
 522                                 data->param_hostname=BUF_strdup(buf);
 523                                 memcpy(&(data->ip[0]),ptr,4);
 524                                 }
 525                         else if (num == 3)
 526                                 {
 527                                 char buf[DECIMAL_SIZE(int)+1];
 528
 529                                 BIO_snprintf(buf,sizeof buf,"%d",*(int *)ptr);
 530                                 if (data->param_port != NULL)
 531                                         OPENSSL_free(data->param_port);
 532                                 data->param_port=BUF_strdup(buf);
 533                                 data->port= *(int *)ptr;
 534                                 }
 535                         }
 536                 break;
 537         case BIO_C_SET_NBIO:
 538                 data->nbio=(int)num;
 539                 break;
 540         case BIO_C_GET_FD:
 541                 if (b->init)
 542                         {
 543                         ip=(int *)ptr;
 544                         if (ip != NULL)
 545                                 *ip=b->num;
 546                         ret=b->num;
 547                         }
 548                 else
 549                         ret= -1;
 550                 break;
 551         case BIO_CTRL_GET_CLOSE:
 552                 ret=b->shutdown;
 553                 break;
 554         case BIO_CTRL_SET_CLOSE:
 555                 b->shutdown=(int)num;
 556                 break;
 557         case BIO_CTRL_PENDING:
 558         case BIO_CTRL_WPENDING:
 559                 ret=0;
 560                 break;
 561         case BIO_CTRL_FLUSH:
 562                 break;
 563         case BIO_CTRL_DUP:
 564                 {
 565                 dbio=(BIO *)ptr;
 566                 if (data->param_port)
 567                         BIO_set_conn_port(dbio,data->param_port);
 568                 if (data->param_hostname)
 569                         BIO_set_conn_hostname(dbio,data->param_hostname);
 570                 BIO_set_nbio(dbio,data->nbio);
 571                 /* FIXME: the cast of the function seems unlikely to be a good idea */
 572                 (void)BIO_set_info_callback(dbio,(bio_info_cb *)data->info_callback);
 573                 }
 574                 break;
 575         case BIO_CTRL_SET_CALLBACK:
 576                 {
 577 #if 0 /* FIXME: Should this be used?  -- Richard Levitte */
 578                 BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 579                 ret = -1;
 580 #else
 581                 ret=0;
 582 #endif
 583                 }
 584                 break;
 585         case BIO_CTRL_GET_CALLBACK:
 586                 {
 587                 int (**fptr)(const BIO *bio,int state,int xret);
 588
 589                 fptr=(int (**)(const BIO *bio,int state,int xret))ptr;
 590                 *fptr=data->info_callback;
 591                 }
 592                 break;
 593         default:
 594                 ret=0;
 595                 break;
 596                 }
 597         return(ret);
 598         }
 599
 600 static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 601         {
 602         long ret=1;
 603         BIO_CONNECT *data;
 604
 605         data=(BIO_CONNECT *)b->ptr;
 606
 607         switch (cmd)
 608                 {
 609         case BIO_CTRL_SET_CALLBACK:
 610                 {
 611                 data->info_callback=(int (*)(const struct bio_st *, int, int))fp;
 612                 }
 613                 break;
 614         default:
 615                 ret=0;
 616                 break;
 617                 }
 618         return(ret);
 619         }
 620
 621 static int conn_puts(BIO *bp, const char *str)
 622         {
 623         int n,ret;
 624
 625         n=strlen(str);
 626         ret=conn_write(bp,str,n);
 627         return(ret);
 628         }
 629
 630 BIO *BIO_new_connect(const char *str)
 631         {
 632         BIO *ret;
 633
 634         ret=BIO_new(BIO_s_connect());
 635         if (ret == NULL) return(NULL);
 636         if (BIO_set_conn_hostname(ret,str))
 637                 return(ret);
 638         else
 639                 {
 640                 BIO_free(ret);
 641                 return(NULL);
 642                 }
 643         }
 644
 645 #endif
 646