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 #ifdef OPENSSL_SYS_WIN16
  68 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  69 #else
  70 #define SOCKET_PROTOCOL IPPROTO_TCP
  71 #endif
  72
  73 #if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
  74 /* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
  75 #undef FIONBIO
  76 #endif
  77
  78
  79 typedef struct bio_connect_st
  80         {
  81         int state;
  82
  83         char *param_hostname;
  84         char *param_port;
  85         int nbio;
  86
  87         unsigned char ip[4];
  88         unsigned short port;
  89
  90         struct sockaddr_in them;
  91
  92         /* int socket; this will be kept in bio->num so that it is
  93          * compatible with the bss_sock bio */
  94
  95         /* called when the connection is initially made
  96          *  callback(BIO,state,ret);  The callback should return
  97          * 'ret'.  state is for compatibility with the ssl info_callback */
  98         int (*info_callback)(const BIO *bio,int state,int ret);
  99         } BIO_CONNECT;
 100
 101 static int conn_write(BIO *h, const char *buf, int num);
 102 static int conn_read(BIO *h, char *buf, int size);
 103 static int conn_puts(BIO *h, const char *str);
 104 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 105 static int conn_new(BIO *h);
 106 static int conn_free(BIO *data);
 107 static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);
 108
 109 static int conn_state(BIO *b, BIO_CONNECT *c);
 110 static void conn_close_socket(BIO *data);
 111 BIO_CONNECT *BIO_CONNECT_new(void );
 112 void BIO_CONNECT_free(BIO_CONNECT *a);
 113
 114 static BIO_METHOD methods_connectp=
 115         {
 116         BIO_TYPE_CONNECT,
 117         "socket connect",
 118         conn_write,
 119         conn_read,
 120         conn_puts,
 121         NULL, /* connect_gets, */
 122         conn_ctrl,
 123         conn_new,
 124         conn_free,
 125         conn_callback_ctrl,
 126         };
 127
 128 static int conn_state(BIO *b, BIO_CONNECT *c)
 129         {
 130         int ret= -1,i;
 131         unsigned long l;
 132         char *p,*q;
 133         int (*cb)(const BIO *,int,int)=NULL;
 134
 135         if (c->info_callback != NULL)
 136                 cb=c->info_callback;
 137
 138         for (;;)
 139                 {
 140                 switch (c->state)
 141                         {
 142                 case BIO_CONN_S_BEFORE:
 143                         p=c->param_hostname;
 144                         if (p == NULL)
 145                                 {
 146                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NO_HOSTNAME_SPECIFIED);
 147                                 goto exit_loop;
 148                                 }
 149                         for ( ; *p != '\0'; p++)
 150                                 {
 151                                 if ((*p == ':') || (*p == '/')) break;
 152                                 }
 153
 154                         i= *p;
 155                         if ((i == ':') || (i == '/'))
 156                                 {
 157
 158                                 *(p++)='\0';
 159                                 if (i == ':')
 160                                         {
 161                                         for (q=p; *q; q++)
 162                                                 if (*q == '/')
 163                                                         {
 164                                                         *q='\0';
 165                                                         break;
 166                                                         }
 167                                         if (c->param_port != NULL)
 168                                                 OPENSSL_free(c->param_port);
 169                                         c->param_port=BUF_strdup(p);
 170                                         }
 171                                 }
 172
 173                         if (c->param_port == NULL)
 174                                 {
 175                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NO_PORT_SPECIFIED);
 176                                 ERR_add_error_data(2,"host=",c->param_hostname);
 177                                 goto exit_loop;
 178                                 }
 179                         c->state=BIO_CONN_S_GET_IP;
 180                         break;
 181
 182                 case BIO_CONN_S_GET_IP:
 183                         if (BIO_get_host_ip(c->param_hostname,&(c->ip[0])) <= 0)
 184                                 goto exit_loop;
 185                         c->state=BIO_CONN_S_GET_PORT;
 186                         break;
 187
 188                 case BIO_CONN_S_GET_PORT:
 189                         if (c->param_port == NULL)
 190                                 {
 191                                 /* abort(); */
 192                                 goto exit_loop;
 193                                 }
 194                         else if (BIO_get_port(c->param_port,&c->port) <= 0)
 195                                 goto exit_loop;
 196                         c->state=BIO_CONN_S_CREATE_SOCKET;
 197                         break;
 198
 199                 case BIO_CONN_S_CREATE_SOCKET:
 200                         /* now setup address */
 201                         memset((char *)&c->them,0,sizeof(c->them));
 202                         c->them.sin_family=AF_INET;
 203                         c->them.sin_port=htons((unsigned short)c->port);
 204                         l=(unsigned long)
 205                                 ((unsigned long)c->ip[0]<<24L)|
 206                                 ((unsigned long)c->ip[1]<<16L)|
 207                                 ((unsigned long)c->ip[2]<< 8L)|
 208                                 ((unsigned long)c->ip[3]);
 209                         c->them.sin_addr.s_addr=htonl(l);
 210                         c->state=BIO_CONN_S_CREATE_SOCKET;
 211
 212                         ret=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 213                         if (ret == INVALID_SOCKET)
 214                                 {
 215                                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 216                                 ERR_add_error_data(4,"host=",c->param_hostname,
 217                                         ":",c->param_port);
 218                                 BIOerr(BIO_F_CONN_STATE,BIO_R_UNABLE_TO_CREATE_SOCKET);
 219                                 goto exit_loop;
 220                                 }
 221                         b->num=ret;
 222                         c->state=BIO_CONN_S_NBIO;
 223                         break;
 224
 225                 case BIO_CONN_S_NBIO:
 226                         if (c->nbio)
 227                                 {
 228                                 if (!BIO_socket_nbio(b->num,1))
 229                                         {
 230                                         BIOerr(BIO_F_CONN_STATE,BIO_R_ERROR_SETTING_NBIO);
 231                                         ERR_add_error_data(4,"host=",
 232                                                 c->param_hostname,
 233                                                 ":",c->param_port);
 234                                         goto exit_loop;
 235                                         }
 236                                 }
 237                         c->state=BIO_CONN_S_CONNECT;
 238
 239 #if defined(SO_KEEPALIVE) && !defined(OPENSSL_SYS_MPE)
 240                         i=1;
 241                         i=setsockopt(b->num,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 242                         if (i < 0)
 243                                 {
 244                                 SYSerr(SYS_F_SOCKET,get_last_socket_error());
 245                                 ERR_add_error_data(4,"host=",c->param_hostname,
 246                                         ":",c->param_port);
 247                                 BIOerr(BIO_F_CONN_STATE,BIO_R_KEEPALIVE);
 248                                 goto exit_loop;
 249                                 }
 250 #endif
 251                         break;
 252
 253                 case BIO_CONN_S_CONNECT:
 254                         BIO_clear_retry_flags(b);
 255                         ret=connect(b->num,
 256                                 (struct sockaddr *)&c->them,
 257                                 sizeof(c->them));
 258                         b->retry_reason=0;
 259                         if (ret < 0)
 260                                 {
 261                                 if (BIO_sock_should_retry(ret))
 262                                         {
 263                                         BIO_set_retry_special(b);
 264                                         c->state=BIO_CONN_S_BLOCKED_CONNECT;
 265                                         b->retry_reason=BIO_RR_CONNECT;
 266                                         }
 267                                 else
 268                                         {
 269                                         SYSerr(SYS_F_CONNECT,get_last_socket_error());
 270                                         ERR_add_error_data(4,"host=",
 271                                                 c->param_hostname,
 272                                                 ":",c->param_port);
 273                                         BIOerr(BIO_F_CONN_STATE,BIO_R_CONNECT_ERROR);
 274                                         }
 275                                 goto exit_loop;
 276                                 }
 277                         else
 278                                 c->state=BIO_CONN_S_OK;
 279                         break;
 280
 281                 case BIO_CONN_S_BLOCKED_CONNECT:
 282                         i=BIO_sock_error(b->num);
 283                         if (i)
 284                                 {
 285                                 BIO_clear_retry_flags(b);
 286                                 SYSerr(SYS_F_CONNECT,i);
 287                                 ERR_add_error_data(4,"host=",
 288                                         c->param_hostname,
 289                                         ":",c->param_port);
 290                                 BIOerr(BIO_F_CONN_STATE,BIO_R_NBIO_CONNECT_ERROR);
 291                                 ret=0;
 292                                 goto exit_loop;
 293                                 }
 294                         else
 295                                 c->state=BIO_CONN_S_OK;
 296                         break;
 297
 298                 case BIO_CONN_S_OK:
 299                         ret=1;
 300                         goto exit_loop;
 301                 default:
 302                         /* abort(); */
 303                         goto exit_loop;
 304                         }
 305
 306                 if (cb != NULL)
 307                         {
 308                         if (!(ret=cb((BIO *)b,c->state,ret)))
 309                                 goto end;
 310                         }
 311                 }
 312
 313         /* Loop does not exit */
 314 exit_loop:
 315         if (cb != NULL)
 316                 ret=cb((BIO *)b,c->state,ret);
 317 end:
 318         return(ret);
 319         }
 320
 321 BIO_CONNECT *BIO_CONNECT_new(void)
 322         {
 323         BIO_CONNECT *ret;
 324
 325         if ((ret=(BIO_CONNECT *)OPENSSL_malloc(sizeof(BIO_CONNECT))) == NULL)
 326                 return(NULL);
 327         ret->state=BIO_CONN_S_BEFORE;
 328         ret->param_hostname=NULL;
 329         ret->param_port=NULL;
 330         ret->info_callback=NULL;
 331         ret->nbio=0;
 332         ret->ip[0]=0;
 333         ret->ip[1]=0;
 334         ret->ip[2]=0;
 335         ret->ip[3]=0;
 336         ret->port=0;
 337         memset((char *)&ret->them,0,sizeof(ret->them));
 338         return(ret);
 339         }
 340
 341 void BIO_CONNECT_free(BIO_CONNECT *a)
 342         {
 343         if(a == NULL)
 344             return;
 345
 346         if (a->param_hostname != NULL)
 347                 OPENSSL_free(a->param_hostname);
 348         if (a->param_port != NULL)
 349                 OPENSSL_free(a->param_port);
 350         OPENSSL_free(a);
 351         }
 352
 353 BIO_METHOD *BIO_s_connect(void)
 354         {
 355         return(&methods_connectp);
 356         }
 357
 358 static int conn_new(BIO *bi)
 359         {
 360         bi->init=0;
 361         bi->num=INVALID_SOCKET;
 362         bi->flags=0;
 363         if ((bi->ptr=(char *)BIO_CONNECT_new()) == NULL)
 364                 return(0);
 365         else
 366                 return(1);
 367         }
 368
 369 static void conn_close_socket(BIO *bio)
 370         {
 371         BIO_CONNECT *c;
 372
 373         c=(BIO_CONNECT *)bio->ptr;
 374         if (bio->num != INVALID_SOCKET)
 375                 {
 376                 /* Only do a shutdown if things were established */
 377                 if (c->state == BIO_CONN_S_OK)
 378                         shutdown(bio->num,2);
 379                 closesocket(bio->num);
 380                 bio->num=INVALID_SOCKET;
 381                 }
 382         }
 383
 384 static int conn_free(BIO *a)
 385         {
 386         BIO_CONNECT *data;
 387
 388         if (a == NULL) return(0);
 389         data=(BIO_CONNECT *)a->ptr;
 390
 391         if (a->shutdown)
 392                 {
 393                 conn_close_socket(a);
 394                 BIO_CONNECT_free(data);
 395                 a->ptr=NULL;
 396                 a->flags=0;
 397                 a->init=0;
 398                 }
 399         return(1);
 400         }
 401
 402 static int conn_read(BIO *b, char *out, int outl)
 403         {
 404         int ret=0;
 405         BIO_CONNECT *data;
 406
 407         data=(BIO_CONNECT *)b->ptr;
 408         if (data->state != BIO_CONN_S_OK)
 409                 {
 410                 ret=conn_state(b,data);
 411                 if (ret <= 0)
 412                                 return(ret);
 413                 }
 414
 415         if (out != NULL)
 416                 {
 417                 clear_socket_error();
 418                 ret=readsocket(b->num,out,outl);
 419                 BIO_clear_retry_flags(b);
 420                 if (ret <= 0)
 421                         {
 422                         if (BIO_sock_should_retry(ret))
 423                                 BIO_set_retry_read(b);
 424                         }
 425                 }
 426         return(ret);
 427         }
 428
 429 static int conn_write(BIO *b, const char *in, int inl)
 430         {
 431         int ret;
 432         BIO_CONNECT *data;
 433
 434         data=(BIO_CONNECT *)b->ptr;
 435         if (data->state != BIO_CONN_S_OK)
 436                 {
 437                 ret=conn_state(b,data);
 438                 if (ret <= 0) return(ret);
 439                 }
 440
 441         clear_socket_error();
 442         ret=writesocket(b->num,in,inl);
 443         BIO_clear_retry_flags(b);
 444         if (ret <= 0)
 445                 {
 446                 if (BIO_sock_should_retry(ret))
 447                         BIO_set_retry_write(b);
 448                 }
 449         return(ret);
 450         }
 451
 452 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 453         {
 454         BIO *dbio;
 455         int *ip;
 456         const char **pptr;
 457         long ret=1;
 458         BIO_CONNECT *data;
 459
 460         data=(BIO_CONNECT *)b->ptr;
 461
 462         switch (cmd)
 463                 {
 464         case BIO_CTRL_RESET:
 465                 ret=0;
 466                 data->state=BIO_CONN_S_BEFORE;
 467                 conn_close_socket(b);
 468                 b->flags=0;
 469                 break;
 470         case BIO_C_DO_STATE_MACHINE:
 471                 /* use this one to start the connection */
 472                 if (!data->state != BIO_CONN_S_OK)
 473                         ret=(long)conn_state(b,data);
 474                 else
 475                         ret=1;
 476                 break;
 477         case BIO_C_GET_CONNECT:
 478                 if (ptr != NULL)
 479                         {
 480                         pptr=(const char **)ptr;
 481                         if (num == 0)
 482                                 {
 483                                 *pptr=data->param_hostname;
 484
 485                                 }
 486                         else if (num == 1)
 487                                 {
 488                                 *pptr=data->param_port;
 489                                 }
 490                         else if (num == 2)
 491                                 {
 492                                 *pptr= (char *)&(data->ip[0]);
 493                                 }
 494                         else if (num == 3)
 495                                 {
 496                                 *((int *)ptr)=data->port;
 497                                 }
 498                         if ((!b->init) || (ptr == NULL))
 499                                 *pptr="not initialized";
 500                         ret=1;
 501                         }
 502                 break;
 503         case BIO_C_SET_CONNECT:
 504                 if (ptr != NULL)
 505                         {
 506                         b->init=1;
 507                         if (num == 0)
 508                                 {
 509                                 if (data->param_hostname != NULL)
 510                                         OPENSSL_free(data->param_hostname);
 511                                 data->param_hostname=BUF_strdup(ptr);
 512                                 }
 513                         else if (num == 1)
 514                                 {
 515                                 if (data->param_port != NULL)
 516                                         OPENSSL_free(data->param_port);
 517                                 data->param_port=BUF_strdup(ptr);
 518                                 }
 519                         else if (num == 2)
 520                                 {
 521                                 char buf[16];
 522                                 unsigned char *p = ptr;
 523
 524                                 BIO_snprintf(buf,sizeof buf,"%d.%d.%d.%d",
 525                                              p[0],p[1],p[2],p[3]);
 526                                 if (data->param_hostname != NULL)
 527                                         OPENSSL_free(data->param_hostname);
 528                                 data->param_hostname=BUF_strdup(buf);
 529                                 memcpy(&(data->ip[0]),ptr,4);
 530                                 }
 531                         else if (num == 3)
 532                                 {
 533                                 char buf[DECIMAL_SIZE(int)+1];
 534
 535                                 BIO_snprintf(buf,sizeof buf,"%d",*(int *)ptr);
 536                                 if (data->param_port != NULL)
 537                                         OPENSSL_free(data->param_port);
 538                                 data->param_port=BUF_strdup(buf);
 539                                 data->port= *(int *)ptr;
 540                                 }
 541                         }
 542                 break;
 543         case BIO_C_SET_NBIO:
 544                 data->nbio=(int)num;
 545                 break;
 546         case BIO_C_GET_FD:
 547                 if (b->init)
 548                         {
 549                         ip=(int *)ptr;
 550                         if (ip != NULL)
 551                                 *ip=b->num;
 552                         ret=b->num;
 553                         }
 554                 else
 555                         ret= -1;
 556                 break;
 557         case BIO_CTRL_GET_CLOSE:
 558                 ret=b->shutdown;
 559                 break;
 560         case BIO_CTRL_SET_CLOSE:
 561                 b->shutdown=(int)num;
 562                 break;
 563         case BIO_CTRL_PENDING:
 564         case BIO_CTRL_WPENDING:
 565                 ret=0;
 566                 break;
 567         case BIO_CTRL_FLUSH:
 568                 break;
 569         case BIO_CTRL_DUP:
 570                 {
 571                 dbio=(BIO *)ptr;
 572                 if (data->param_port)
 573                         BIO_set_conn_port(dbio,data->param_port);
 574                 if (data->param_hostname)
 575                         BIO_set_conn_hostname(dbio,data->param_hostname);
 576                 BIO_set_nbio(dbio,data->nbio);
 577                 /* FIXME: the cast of the function seems unlikely to be a good idea */
 578                 (void)BIO_set_info_callback(dbio,(bio_info_cb *)data->info_callback);
 579                 }
 580                 break;
 581         case BIO_CTRL_SET_CALLBACK:
 582                 {
 583 #if 0 /* FIXME: Should this be used?  -- Richard Levitte */
 584                 BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 585                 ret = -1;
 586 #else
 587                 ret=0;
 588 #endif
 589                 }
 590                 break;
 591         case BIO_CTRL_GET_CALLBACK:
 592                 {
 593                 int (**fptr)();
 594
 595                 fptr=(int (**)())ptr;
 596                 *fptr=data->info_callback;
 597                 }
 598                 break;
 599         default:
 600                 ret=0;
 601                 break;
 602                 }
 603         return(ret);
 604         }
 605
 606 static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 607         {
 608         long ret=1;
 609         BIO_CONNECT *data;
 610
 611         data=(BIO_CONNECT *)b->ptr;
 612
 613         switch (cmd)
 614                 {
 615         case BIO_CTRL_SET_CALLBACK:
 616                 {
 617                 data->info_callback=(int (*)(const struct bio_st *, int, int))fp;
 618                 }
 619                 break;
 620         default:
 621                 ret=0;
 622                 break;
 623                 }
 624         return(ret);
 625         }
 626
 627 static int conn_puts(BIO *bp, const char *str)
 628         {
 629         int n,ret;
 630
 631         n=strlen(str);
 632         ret=conn_write(bp,str,n);
 633         return(ret);
 634         }
 635
 636 BIO *BIO_new_connect(char *str)
 637         {
 638         BIO *ret;
 639
 640         ret=BIO_new(BIO_s_connect());
 641         if (ret == NULL) return(NULL);
 642         if (BIO_set_conn_hostname(ret,str))
 643                 return(ret);
 644         else
 645                 {
 646                 BIO_free(ret);
 647                 return(NULL);
 648                 }
 649         }
 650
 651 #endif
 652