crypto/bio/bss_conn.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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,                       /* conn_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                 ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
 142                                "calling socket(%s, %s)",
 143                                c->param_hostname, c->param_service);
 144                 BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
 145                 goto exit_loop;
 146             }
 147             b->num = ret;
 148             c->state = BIO_CONN_S_CONNECT;
 149             break;
 150
 151         case BIO_CONN_S_CONNECT:
 152             BIO_clear_retry_flags(b);
 153             ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
 154                               BIO_SOCK_KEEPALIVE | c->connect_mode);
 155             b->retry_reason = 0;
 156             if (ret == 0) {
 157                 if (BIO_sock_should_retry(ret)) {
 158                     BIO_set_retry_special(b);
 159                     c->state = BIO_CONN_S_BLOCKED_CONNECT;
 160                     b->retry_reason = BIO_RR_CONNECT;
 161                     ERR_clear_error();
 162                 } else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
 163                            != NULL) {
 164                     /*
 165                      * if there are more addresses to try, do that first
 166                      */
 167                     BIO_closesocket(b->num);
 168                     c->state = BIO_CONN_S_CREATE_SOCKET;
 169                     ERR_clear_error();
 170                     break;
 171                 } else {
 172                     ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(),
 173                                    "calling connect(%s, %s)",
 174                                     c->param_hostname, c->param_service);
 175                     BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
 176                 }
 177                 goto exit_loop;
 178             } else {
 179                 c->state = BIO_CONN_S_OK;
 180             }
 181             break;
 182
 183         case BIO_CONN_S_BLOCKED_CONNECT:
 184             i = BIO_sock_error(b->num);
 185             if (i) {
 186                 BIO_clear_retry_flags(b);
 187                 ERR_raise_data(ERR_LIB_SYS, i,
 188                                "calling connect(%s, %s)",
 189                                 c->param_hostname, c->param_service);
 190                 BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
 191                 ret = 0;
 192                 goto exit_loop;
 193             } else
 194                 c->state = BIO_CONN_S_OK;
 195             break;
 196
 197         case BIO_CONN_S_OK:
 198             ret = 1;
 199             goto exit_loop;
 200         default:
 201             /* abort(); */
 202             goto exit_loop;
 203         }
 204
 205         if (cb != NULL) {
 206             if ((ret = cb((BIO *)b, c->state, ret)) == 0)
 207                 goto end;
 208         }
 209     }
 210
 211     /* Loop does not exit */
 212  exit_loop:
 213     if (cb != NULL)
 214         ret = cb((BIO *)b, c->state, ret);
 215  end:
 216     return ret;
 217 }
 218
 219 BIO_CONNECT *BIO_CONNECT_new(void)
 220 {
 221     BIO_CONNECT *ret;
 222
 223     if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
 224         BIOerr(BIO_F_BIO_CONNECT_NEW, ERR_R_MALLOC_FAILURE);
 225         return NULL;
 226     }
 227     ret->state = BIO_CONN_S_BEFORE;
 228     ret->connect_family = BIO_FAMILY_IPANY;
 229     return ret;
 230 }
 231
 232 void BIO_CONNECT_free(BIO_CONNECT *a)
 233 {
 234     if (a == NULL)
 235         return;
 236     OPENSSL_free(a->param_hostname);
 237     OPENSSL_free(a->param_service);
 238     BIO_ADDRINFO_free(a->addr_first);
 239     OPENSSL_free(a);
 240 }
 241
 242 const BIO_METHOD *BIO_s_connect(void)
 243 {
 244     return &methods_connectp;
 245 }
 246
 247 static int conn_new(BIO *bi)
 248 {
 249     bi->init = 0;
 250     bi->num = (int)INVALID_SOCKET;
 251     bi->flags = 0;
 252     if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
 253         return 0;
 254     else
 255         return 1;
 256 }
 257
 258 static void conn_close_socket(BIO *bio)
 259 {
 260     BIO_CONNECT *c;
 261
 262     c = (BIO_CONNECT *)bio->ptr;
 263     if (bio->num != (int)INVALID_SOCKET) {
 264         /* Only do a shutdown if things were established */
 265         if (c->state == BIO_CONN_S_OK)
 266             shutdown(bio->num, 2);
 267         BIO_closesocket(bio->num);
 268         bio->num = (int)INVALID_SOCKET;
 269     }
 270 }
 271
 272 static int conn_free(BIO *a)
 273 {
 274     BIO_CONNECT *data;
 275
 276     if (a == NULL)
 277         return 0;
 278     data = (BIO_CONNECT *)a->ptr;
 279
 280     if (a->shutdown) {
 281         conn_close_socket(a);
 282         BIO_CONNECT_free(data);
 283         a->ptr = NULL;
 284         a->flags = 0;
 285         a->init = 0;
 286     }
 287     return 1;
 288 }
 289
 290 static int conn_read(BIO *b, char *out, int outl)
 291 {
 292     int ret = 0;
 293     BIO_CONNECT *data;
 294
 295     data = (BIO_CONNECT *)b->ptr;
 296     if (data->state != BIO_CONN_S_OK) {
 297         ret = conn_state(b, data);
 298         if (ret <= 0)
 299             return ret;
 300     }
 301
 302     if (out != NULL) {
 303         clear_socket_error();
 304         ret = readsocket(b->num, out, outl);
 305         BIO_clear_retry_flags(b);
 306         if (ret <= 0) {
 307             if (BIO_sock_should_retry(ret))
 308                 BIO_set_retry_read(b);
 309         }
 310     }
 311     return ret;
 312 }
 313
 314 static int conn_write(BIO *b, const char *in, int inl)
 315 {
 316     int ret;
 317     BIO_CONNECT *data;
 318
 319     data = (BIO_CONNECT *)b->ptr;
 320     if (data->state != BIO_CONN_S_OK) {
 321         ret = conn_state(b, data);
 322         if (ret <= 0)
 323             return ret;
 324     }
 325
 326     clear_socket_error();
 327     ret = writesocket(b->num, in, inl);
 328     BIO_clear_retry_flags(b);
 329     if (ret <= 0) {
 330         if (BIO_sock_should_retry(ret))
 331             BIO_set_retry_write(b);
 332     }
 333     return ret;
 334 }
 335
 336 static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 337 {
 338     BIO *dbio;
 339     int *ip;
 340     const char **pptr = NULL;
 341     long ret = 1;
 342     BIO_CONNECT *data;
 343
 344     data = (BIO_CONNECT *)b->ptr;
 345
 346     switch (cmd) {
 347     case BIO_CTRL_RESET:
 348         ret = 0;
 349         data->state = BIO_CONN_S_BEFORE;
 350         conn_close_socket(b);
 351         BIO_ADDRINFO_free(data->addr_first);
 352         data->addr_first = NULL;
 353         b->flags = 0;
 354         break;
 355     case BIO_C_DO_STATE_MACHINE:
 356         /* use this one to start the connection */
 357         if (data->state != BIO_CONN_S_OK)
 358             ret = (long)conn_state(b, data);
 359         else
 360             ret = 1;
 361         break;
 362     case BIO_C_GET_CONNECT:
 363         if (ptr != NULL) {
 364             pptr = (const char **)ptr;
 365             if (num == 0) {
 366                 *pptr = data->param_hostname;
 367             } else if (num == 1) {
 368                 *pptr = data->param_service;
 369             } else if (num == 2) {
 370                 *pptr = (const char *)BIO_ADDRINFO_address(data->addr_iter);
 371             } else if (num == 3) {
 372                 switch (BIO_ADDRINFO_family(data->addr_iter)) {
 373 # ifdef AF_INET6
 374                 case AF_INET6:
 375                     ret = BIO_FAMILY_IPV6;
 376                     break;
 377 # endif
 378                 case AF_INET:
 379                     ret = BIO_FAMILY_IPV4;
 380                     break;
 381                 case 0:
 382                     ret = data->connect_family;
 383                     break;
 384                 default:
 385                     ret = -1;
 386                     break;
 387                 }
 388             } else {
 389                 ret = 0;
 390             }
 391         } else {
 392             ret = 0;
 393         }
 394         break;
 395     case BIO_C_SET_CONNECT:
 396         if (ptr != NULL) {
 397             b->init = 1;
 398             if (num == 0) {
 399                 char *hold_service = data->param_service;
 400                 /* We affect the hostname regardless.  However, the input
 401                  * string might contain a host:service spec, so we must
 402                  * parse it, which might or might not affect the service
 403                  */
 404                 OPENSSL_free(data->param_hostname);
 405                 data->param_hostname = NULL;
 406                 ret = BIO_parse_hostserv(ptr,
 407                                          &data->param_hostname,
 408                                          &data->param_service,
 409                                          BIO_PARSE_PRIO_HOST);
 410                 if (hold_service != data->param_service)
 411                     OPENSSL_free(hold_service);
 412             } else if (num == 1) {
 413                 OPENSSL_free(data->param_service);
 414                 data->param_service = BUF_strdup(ptr);
 415             } else if (num == 2) {
 416                 const BIO_ADDR *addr = (const BIO_ADDR *)ptr;
 417                 if (ret) {
 418                     data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
 419                     data->param_service = BIO_ADDR_service_string(addr, 1);
 420                     BIO_ADDRINFO_free(data->addr_first);
 421                     data->addr_first = NULL;
 422                     data->addr_iter = NULL;
 423                 }
 424             } else if (num == 3) {
 425                 data->connect_family = *(int *)ptr;
 426             } else {
 427                 ret = 0;
 428             }
 429         }
 430         break;
 431     case BIO_C_SET_NBIO:
 432         if (num != 0)
 433             data->connect_mode |= BIO_SOCK_NONBLOCK;
 434         else
 435             data->connect_mode &= ~BIO_SOCK_NONBLOCK;
 436         break;
 437     case BIO_C_SET_CONNECT_MODE:
 438         data->connect_mode = (int)num;
 439         break;
 440     case BIO_C_GET_FD:
 441         if (b->init) {
 442             ip = (int *)ptr;
 443             if (ip != NULL)
 444                 *ip = b->num;
 445             ret = b->num;
 446         } else
 447             ret = -1;
 448         break;
 449     case BIO_CTRL_GET_CLOSE:
 450         ret = b->shutdown;
 451         break;
 452     case BIO_CTRL_SET_CLOSE:
 453         b->shutdown = (int)num;
 454         break;
 455     case BIO_CTRL_PENDING:
 456     case BIO_CTRL_WPENDING:
 457         ret = 0;
 458         break;
 459     case BIO_CTRL_FLUSH:
 460         break;
 461     case BIO_CTRL_DUP:
 462         {
 463             dbio = (BIO *)ptr;
 464             if (data->param_hostname)
 465                 BIO_set_conn_hostname(dbio, data->param_hostname);
 466             if (data->param_service)
 467                 BIO_set_conn_port(dbio, data->param_service);
 468             BIO_set_conn_ip_family(dbio, data->connect_family);
 469             BIO_set_conn_mode(dbio, data->connect_mode);
 470             /*
 471              * FIXME: the cast of the function seems unlikely to be a good
 472              * idea
 473              */
 474             (void)BIO_set_info_callback(dbio, data->info_callback);
 475         }
 476         break;
 477     case BIO_CTRL_SET_CALLBACK:
 478         ret = 0; /* use callback ctrl */
 479         break;
 480     case BIO_CTRL_GET_CALLBACK:
 481         {
 482             BIO_info_cb **fptr;
 483
 484             fptr = (BIO_info_cb **)ptr;
 485             *fptr = data->info_callback;
 486         }
 487         break;
 488     default:
 489         ret = 0;
 490         break;
 491     }
 492     return ret;
 493 }
 494
 495 static long conn_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
 496 {
 497     long ret = 1;
 498     BIO_CONNECT *data;
 499
 500     data = (BIO_CONNECT *)b->ptr;
 501
 502     switch (cmd) {
 503     case BIO_CTRL_SET_CALLBACK:
 504         {
 505             data->info_callback = fp;
 506         }
 507         break;
 508     default:
 509         ret = 0;
 510         break;
 511     }
 512     return ret;
 513 }
 514
 515 static int conn_puts(BIO *bp, const char *str)
 516 {
 517     int n, ret;
 518
 519     n = strlen(str);
 520     ret = conn_write(bp, str, n);
 521     return ret;
 522 }
 523
 524 BIO *BIO_new_connect(const char *str)
 525 {
 526     BIO *ret;
 527
 528     ret = BIO_new(BIO_s_connect());
 529     if (ret == NULL)
 530         return NULL;
 531     if (BIO_set_conn_hostname(ret, str))
 532         return ret;
 533     BIO_free(ret);
 534     return NULL;
 535 }
 536
 537 #endif