crypto/bio/bss_conn.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <errno.h>
  12
  13 #include "bio_lcl.h"
  14
  15 #ifndef OPENSSL_NO_SOCK
  16
  17 typedef struct bio_connect_st {
  18     int state;
  19     int connect_family;
  20     char *param_hostname;
  21     char *param_service;
  22     int connect_mode;
  23
  24     BIO_ADDRINFO *addr_first;
  25     const BIO_ADDRINFO *addr_iter;
  26     /*
  27      * int socket; this will be kept in bio->num so that it is compatible
  28      * with the bss_sock bio
  29      */
  30     /*
  31      * called when the connection is initially made callback(BIO,state,ret);
  32      * The callback should return 'ret'.  state is for compatibility with the
  33      * ssl info_callback
  34      */
  35     BIO_info_cb *info_callback;
  36 } BIO_CONNECT;
  37
  38 static int conn_write(BIO *h, const char *buf, int num);
  39 static int conn_read(BIO *h, char *buf, int size);
  40 static int conn_puts(BIO *h, const char *str);
  41 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  42 static int conn_new(BIO *h);
  43 static int conn_free(BIO *data);
  44 static long conn_callback_ctrl(BIO *h, int cmd, BIO_info_cb *);
  45
  46 static int conn_state(BIO *b, BIO_CONNECT *c);
  47 static void conn_close_socket(BIO *data);
  48 BIO_CONNECT *BIO_CONNECT_new(void);
  49 void BIO_CONNECT_free(BIO_CONNECT *a);
  50
  51 #define BIO_CONN_S_BEFORE                1
  52 #define BIO_CONN_S_GET_ADDR              2
  53 #define BIO_CONN_S_CREATE_SOCKET         3
  54 #define BIO_CONN_S_CONNECT               4
  55 #define BIO_CONN_S_OK                    5
  56 #define BIO_CONN_S_BLOCKED_CONNECT       6
  57
  58 static const BIO_METHOD methods_connectp = {
  59     BIO_TYPE_CONNECT,
  60     "socket connect",
  61     /* TODO: Convert to new style write function */
  62     bwrite_conv,
  63     conn_write,
  64     /* TODO: Convert to new style read function */
  65     bread_conv,
  66     conn_read,
  67     conn_puts,
  68     NULL,                       /* connect_gets, */
  69     conn_ctrl,
  70     conn_new,
  71     conn_free,
  72     conn_callback_ctrl,
  73 };
  74
  75 static int conn_state(BIO *b, BIO_CONNECT *c)
  76 {
  77     int ret = -1, i;
  78     BIO_info_cb *cb = NULL;
  79
  80     if (c->info_callback != NULL)
  81         cb = c->info_callback;
  82
  83     for (;;) {
  84         switch (c->state) {
  85         case BIO_CONN_S_BEFORE:
  86             if (c->param_hostname == NULL && c->param_service == NULL) {
  87                 BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_OR_SERVICE_SPECIFIED);
  88                 ERR_add_error_data(4,
  89                                    "hostname=", c->param_hostname,
  90                                    " service=", c->param_service);
  91                 goto exit_loop;
  92             }
  93             c->state = BIO_CONN_S_GET_ADDR;
  94             break;
  95
  96         case BIO_CONN_S_GET_ADDR:
  97             {
  98                 int family = AF_UNSPEC;
  99                 switch (c->connect_family) {
 100                 case BIO_FAMILY_IPV6:
 101                     if (1) { /* This is a trick we use to avoid bit rot.
 102                               * at least the "else" part will always be
 103                               * compiled.
 104                               */
 105 #ifdef AF_INET6
 106                         family = AF_INET6;
 107                     } else {
 108 #endif
 109                         BIOerr(BIO_F_CONN_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
 110                         goto exit_loop;
 111                     }
 112                     break;
 113                 case BIO_FAMILY_IPV4:
 114                     family = AF_INET;
 115                     break;
 116                 case BIO_FAMILY_IPANY:
 117                     family = AF_UNSPEC;
 118                     break;
 119                 default:
 120                     BIOerr(BIO_F_CONN_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
 121                     goto exit_loop;
 122                 }
 123                 if (BIO_lookup(c->param_hostname, c->param_service,
 124                                BIO_LOOKUP_CLIENT,
 125                                family, SOCK_STREAM, &c->addr_first) == 0)
 126                     goto exit_loop;
 127             }
 128             if (c->addr_first == NULL) {
 129                 BIOerr(BIO_F_CONN_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
 130                 goto exit_loop;
 131             }
 132             c->addr_iter = c->addr_first;
 133             c->state = BIO_CONN_S_CREATE_SOCKET;
 134             break;
 135
 136         case BIO_CONN_S_CREATE_SOCKET:
 137             ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
 138                              BIO_ADDRINFO_socktype(c->addr_iter),
 139                              BIO_ADDRINFO_protocol(c->addr_iter), 0);
 140             if (ret == (int)INVALID_SOCKET) {
 141                 SYSerr(SYS_F_SOCKET, get_last_socket_error());
 142                 ERR_add_error_data(4,
 143                                    "hostname=", c->param_hostname,
 144                                    " service=", c->param_service);
 145                 BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
 146                 goto exit_loop;
 147             }
 148             b->num = ret;
 149             c->state = BIO_CONN_S_CONNECT;
 150             break;
 151
 152         case BIO_CONN_S_CONNECT:
 153             BIO_clear_retry_flags(b);
 154             ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
 155                               BIO_SOCK_KEEPALIVE | c->connect_mode);
 156             b->retry_reason = 0;
 157             if (ret == 0) {
 158                 if (BIO_sock_should_retry(ret)) {
 159                     BIO_set_retry_special(b);
 160                     c->state = BIO_CONN_S_BLOCKED_CONNECT;
 161                     b->retry_reason = BIO_RR_CONNECT;
 162                     ERR_clear_error();
 163                 } else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
 164                            != NULL) {
 165                     /*
 166                      * if there are more addresses to try, do that first
 167                      */
 168                     BIO_closesocket(b->num);
 169                     c->state = BIO_CONN_S_CREATE_SOCKET;
 170                     ERR_clear_error();
 171                     break;
 172                 } else {
 173                     SYSerr(SYS_F_CONNECT, get_last_socket_error());
 174                     ERR_add_error_data(4,
 175                                        "hostname=", c->param_hostname,
 176                                        " service=", c->param_service);
 177                     BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
 178                 }
 179                 goto exit_loop;
 180             } else {
 181                 c->state = BIO_CONN_S_OK;
 182             }
 183             break;
 184
 185         case BIO_CONN_S_BLOCKED_CONNECT:
 186             i = BIO_sock_error(b->num);
 187             if (i) {
 188                 BIO_clear_retry_flags(b);
 189                 SYSerr(SYS_F_CONNECT, i);
 190                 ERR_add_error_data(4,
 191                                    "hostname=", c->param_hostname,
 192                                    " service=", c->param_service);
 193                 BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
 194                 ret = 0;
 195                 goto exit_loop;
 196             } else
 197                 c->state = BIO_CONN_S_OK;
 198             break;
 199
 200         case BIO_CONN_S_OK:
 201             ret = 1;
 202             goto exit_loop;
 203         default:
 204             /* abort(); */
 205             goto exit_loop;
 206         }
 207
 208         if (cb != NULL) {
 209             if ((ret = cb((BIO *)b, c->state, ret)) == 0)
 210                 goto end;
 211         }
 212     }
 213
 214     /* Loop does not exit */
 215  exit_loop:
 216     if (cb != NULL)
 217         ret = cb((BIO *)b, c->state, ret);
 218  end:
 219     return ret;
 220 }
 221
 222 BIO_CONNECT *BIO_CONNECT_new(void)
 223 {
 224     BIO_CONNECT *ret;
 225
 226     if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
 227         return NULL;
 228     ret->state = BIO_CONN_S_BEFORE;
 229     ret->connect_family = BIO_FAMILY_IPANY;
 230     return ret;
 231 }
 232
 233 void BIO_CONNECT_free(BIO_CONNECT *a)
 234 {
 235     if (a == NULL)
 236         return;
 237
 238     OPENSSL_free(a->param_hostname);
 239     OPENSSL_free(a->param_service);
 240     BIO_ADDRINFO_free(a->addr_first);
 241     OPENSSL_free(a);
 242 }
 243
 244 const BIO_METHOD *BIO_s_connect(void)
 245 {
 246     return &methods_connectp;
 247 }
 248
 249 static int conn_new(BIO *bi)
 250 {
 251     bi->init = 0;
 252     bi->num = (int)INVALID_SOCKET;
 253     bi->flags = 0;
 254     if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
 255         return 0;
 256     else
 257         return 1;
 258 }
 259
 260 static void conn_close_socket(BIO *bio)
 261 {
 262     BIO_CONNECT *c;
 263
 264     c = (BIO_CONNECT *)bio->ptr;
 265     if (bio->num != (int)INVALID_SOCKET) {
 266         /* Only do a shutdown if things were established */
 267         if (c->state == BIO_CONN_S_OK)
 268             shutdown(bio->num, 2);
 269         BIO_closesocket(bio->num);
 270         bio->num = (int)INVALID_SOCKET;
 271     }
 272 }
 273
 274 static int conn_free(BIO *a)
 275 {
 276     BIO_CONNECT *data;
 277
 278     if (a == NULL)
 279         return 0;
 280     data = (BIO_CONNECT *)a->ptr;
 281
 282     if (a->shutdown) {
 283         conn_close_socket(a);
 284         BIO_CONNECT_free(data);
 285         a->ptr = NULL;
 286         a->flags = 0;
 287         a->init = 0;
 288     }
 289     return 1;
 290 }
 291
 292 static int conn_read(BIO *b, char *out, int outl)
 293 {
 294     int ret = 0;
 295     BIO_CONNECT *data;
 296
 297     data = (BIO_CONNECT *)b->ptr;
 298     if (data->state != BIO_CONN_S_OK) {
 299         ret = conn_state(b, data);
 300         if (ret <= 0)
 301             return ret;
 302     }
 303
 304     if (out != NULL) {
 305         clear_socket_error();
 306         ret = readsocket(b->num, out, outl);
 307         BIO_clear_retry_flags(b);
 308         if (ret <= 0) {
 309             if (BIO_sock_should_retry(ret))
 310                 BIO_set_retry_read(b);
 311         }
 312     }
 313     return ret;
 314 }
 315
 316 static int conn_write(BIO *b, const char *in, int inl)
 317 {
 318     int ret;
 319     BIO_CONNECT *data;
 320
 321     data = (BIO_CONNECT *)b->ptr;
 322     if (data->state != BIO_CONN_S_OK) {
 323         ret = conn_state(b, data);
 324         if (ret <= 0)
 325             return ret;
 326     }
 327
 328     clear_socket_error();
 329     ret = writesocket(b->num, in, inl);
 330     BIO_clear_retry_flags(b);
 331     if (ret <= 0) {
 332         if (BIO_sock_should_retry(ret))
 333             BIO_set_retry_write(b);
 334     }
 335     return ret;
 336 }
 337
 338 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 339 {
 340     BIO *dbio;
 341     int *ip;
 342     const char **pptr = NULL;
 343     long ret = 1;
 344     BIO_CONNECT *data;
 345
 346     data = (BIO_CONNECT *)b->ptr;
 347
 348     switch (cmd) {
 349     case BIO_CTRL_RESET:
 350         ret = 0;
 351         data->state = BIO_CONN_S_BEFORE;
 352         conn_close_socket(b);
 353         BIO_ADDRINFO_free(data->addr_first);
 354         data->addr_first = NULL;
 355         b->flags = 0;
 356         break;
 357     case BIO_C_DO_STATE_MACHINE:
 358         /* use this one to start the connection */
 359         if (data->state != BIO_CONN_S_OK)
 360             ret = (long)conn_state(b, data);
 361         else
 362             ret = 1;
 363         break;
 364     case BIO_C_GET_CONNECT:
 365         if (ptr != NULL) {
 366             pptr = (const char **)ptr;
 367             if (num == 0) {
 368                 *pptr = data->param_hostname;
 369             } else if (num == 1) {
 370                 *pptr = data->param_service;
 371             } else if (num == 2) {
 372                 *pptr = (const char *)BIO_ADDRINFO_address(data->addr_iter);
 373             } else if (num == 3) {
 374                 switch (BIO_ADDRINFO_family(data->addr_iter)) {
 375 # ifdef AF_INET6
 376                 case AF_INET6:
 377                     ret = BIO_FAMILY_IPV6;
 378                     break;
 379 # endif
 380                 case AF_INET:
 381                     ret = BIO_FAMILY_IPV4;
 382                     break;
 383                 case 0:
 384                     ret = data->connect_family;
 385                     break;
 386                 default:
 387                     ret = -1;
 388                     break;
 389                 }
 390             } else {
 391                 ret = 0;
 392             }
 393         } else {
 394             ret = 0;
 395         }
 396         break;
 397     case BIO_C_SET_CONNECT:
 398         if (ptr != NULL) {
 399             b->init = 1;
 400             if (num == 0) {
 401                 char *hold_service = data->param_service;
 402                 /* We affect the hostname regardless.  However, the input
 403                  * string might contain a host:service spec, so we must
 404                  * parse it, which might or might not affect the service
 405                  */
 406                 OPENSSL_free(data->param_hostname);
 407                 data->param_hostname = NULL;
 408                 ret = BIO_parse_hostserv(ptr,
 409                                          &data->param_hostname,
 410                                          &data->param_service,
 411                                          BIO_PARSE_PRIO_HOST);
 412                 if (hold_service != data->param_service)
 413                     OPENSSL_free(hold_service);
 414             } else if (num == 1) {
 415                 OPENSSL_free(data->param_service);
 416                 data->param_service = BUF_strdup(ptr);
 417             } else if (num == 2) {
 418                 const BIO_ADDR *addr = (const BIO_ADDR *)ptr;
 419                 if (ret) {
 420                     data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
 421                     data->param_service = BIO_ADDR_service_string(addr, 1);
 422                     BIO_ADDRINFO_free(data->addr_first);
 423                     data->addr_first = NULL;
 424                     data->addr_iter = NULL;
 425                 }
 426             } else if (num == 3) {
 427                 data->connect_family = *(int *)ptr;
 428             } else {
 429                 ret = 0;
 430             }
 431         }
 432         break;
 433     case BIO_C_SET_NBIO:
 434         if (num != 0)
 435             data->connect_mode |= BIO_SOCK_NONBLOCK;
 436         else
 437             data->connect_mode &= ~BIO_SOCK_NONBLOCK;
 438         break;
 439     case BIO_C_SET_CONNECT_MODE:
 440         data->connect_mode = (int)num;
 441         break;
 442     case BIO_C_GET_FD:
 443         if (b->init) {
 444             ip = (int *)ptr;
 445             if (ip != NULL)
 446                 *ip = b->num;
 447             ret = b->num;
 448         } else
 449             ret = -1;
 450         break;
 451     case BIO_CTRL_GET_CLOSE:
 452         ret = b->shutdown;
 453         break;
 454     case BIO_CTRL_SET_CLOSE:
 455         b->shutdown = (int)num;
 456         break;
 457     case BIO_CTRL_PENDING:
 458     case BIO_CTRL_WPENDING:
 459         ret = 0;
 460         break;
 461     case BIO_CTRL_FLUSH:
 462         break;
 463     case BIO_CTRL_DUP:
 464         {
 465             dbio = (BIO *)ptr;
 466             if (data->param_hostname)
 467                 BIO_set_conn_hostname(dbio, data->param_hostname);
 468             if (data->param_service)
 469                 BIO_set_conn_port(dbio, data->param_service);
 470             BIO_set_conn_ip_family(dbio, data->connect_family);
 471             BIO_set_conn_mode(dbio, data->connect_mode);
 472             /*
 473              * FIXME: the cast of the function seems unlikely to be a good
 474              * idea
 475              */
 476             (void)BIO_set_info_callback(dbio, data->info_callback);
 477         }
 478         break;
 479     case BIO_CTRL_SET_CALLBACK:
 480         ret = 0; /* use callback ctrl */
 481         break;
 482     case BIO_CTRL_GET_CALLBACK:
 483         {
 484             BIO_info_cb **fptr;
 485
 486             fptr = (BIO_info_cb **)ptr;
 487             *fptr = data->info_callback;
 488         }
 489         break;
 490     default:
 491         ret = 0;
 492         break;
 493     }
 494     return ret;
 495 }
 496
 497 static long conn_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
 498 {
 499     long ret = 1;
 500     BIO_CONNECT *data;
 501
 502     data = (BIO_CONNECT *)b->ptr;
 503
 504     switch (cmd) {
 505     case BIO_CTRL_SET_CALLBACK:
 506         {
 507             data->info_callback = fp;
 508         }
 509         break;
 510     default:
 511         ret = 0;
 512         break;
 513     }
 514     return ret;
 515 }
 516
 517 static int conn_puts(BIO *bp, const char *str)
 518 {
 519     int n, ret;
 520
 521     n = strlen(str);
 522     ret = conn_write(bp, str, n);
 523     return ret;
 524 }
 525
 526 BIO *BIO_new_connect(const char *str)
 527 {
 528     BIO *ret;
 529
 530     ret = BIO_new(BIO_s_connect());
 531     if (ret == NULL)
 532         return NULL;
 533     if (BIO_set_conn_hostname(ret, str))
 534         return ret;
 535     BIO_free(ret);
 536     return NULL;
 537 }
 538
 539 #endif