_ Git - BearSSL/blob - tools/client.c

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdint.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <netdb.h>
  35 #include <netinet/in.h>
  36 #include <arpa/inet.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39
  40 #include "brssl.h"
  41 #include "bearssl.h"
  42
  43 static int
  44 host_connect(const char *host, const char *port, int verbose)
  45 {
  46         struct addrinfo hints, *si, *p;
  47         int fd;
  48         int err;
  49
  50         memset(&hints, 0, sizeof hints);
  51         hints.ai_family = PF_UNSPEC;
  52         hints.ai_socktype = SOCK_STREAM;
  53         err = getaddrinfo(host, port, &hints, &si);
  54         if (err != 0) {
  55                 fprintf(stderr, "ERROR: getaddrinfo(): %s\n",
  56                         gai_strerror(err));
  57                 return -1;
  58         }
  59         fd = -1;
  60         for (p = si; p != NULL; p = p->ai_next) {
  61                 if (verbose) {
  62                         struct sockaddr *sa;
  63                         void *addr;
  64                         char tmp[INET6_ADDRSTRLEN + 50];
  65
  66                         sa = (struct sockaddr *)p->ai_addr;
  67                         if (sa->sa_family == AF_INET) {
  68                                 addr = &((struct sockaddr_in *)sa)->sin_addr;
  69                         } else if (sa->sa_family == AF_INET6) {
  70                                 addr = &((struct sockaddr_in6 *)sa)->sin6_addr;
  71                         } else {
  72                                 addr = NULL;
  73                         }
  74                         if (addr != NULL) {
  75                                 if (!inet_ntop(p->ai_family, addr,
  76                                         tmp, sizeof tmp))
  77                                 {
  78                                         strcpy(tmp, "<invalid>");
  79                                 }
  80                         } else {
  81                                 sprintf(tmp, "<unknown family: %d>",
  82                                         (int)sa->sa_family);
  83                         }
  84                         fprintf(stderr, "connecting to: %s\n", tmp);
  85                 }
  86                 fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
  87                 if (fd < 0) {
  88                         if (verbose) {
  89                                 perror("socket()");
  90                         }
  91                         continue;
  92                 }
  93                 if (connect(fd, p->ai_addr, p->ai_addrlen) < 0) {
  94                         if (verbose) {
  95                                 perror("connect()");
  96                         }
  97                         close(fd);
  98                         continue;
  99                 }
 100                 break;
 101         }
 102         if (p == NULL) {
 103                 freeaddrinfo(si);
 104                 fprintf(stderr, "ERROR: failed to connect\n");
 105                 return -1;
 106         }
 107         freeaddrinfo(si);
 108         if (verbose) {
 109                 fprintf(stderr, "connected.\n");
 110         }
 111
 112         /*
 113          * We make the socket non-blocking, since we are going to use
 114          * poll() to organise I/O.
 115          */
 116         fcntl(fd, F_SETFL, O_NONBLOCK);
 117         return fd;
 118 }
 119
 120 static void
 121 usage_client(void)
 122 {
 123         fprintf(stderr,
 124 "usage: brssl client server[:port] [ options ]\n");
 125         fprintf(stderr,
 126 "options:\n");
 127         fprintf(stderr,
 128 "   -q              suppress verbose messages\n");
 129         fprintf(stderr,
 130 "   -trace          activate extra debug messages (dump of all packets)\n");
 131         fprintf(stderr,
 132 "   -sni name       use this specific name for SNI\n");
 133         fprintf(stderr,
 134 "   -nosni          do not send any SNI\n");
 135         fprintf(stderr,
 136 "   -mono           use monodirectional buffering\n");
 137         fprintf(stderr,
 138 "   -buf length     set the I/O buffer length (in bytes)\n");
 139         fprintf(stderr,
 140 "   -CA file        add certificates in 'file' to trust anchors\n");
 141         fprintf(stderr,
 142 "   -list           list supported names (protocols, algorithms...)\n");
 143         fprintf(stderr,
 144 "   -vmin name      set minimum supported version (default: TLS-1.0)\n");
 145         fprintf(stderr,
 146 "   -vmax name      set maximum supported version (default: TLS-1.2)\n");
 147         fprintf(stderr,
 148 "   -cs names       set list of supported cipher suites (comma-separated)\n");
 149         fprintf(stderr,
 150 "   -hf names       add support for some hash functions (comma-separated)\n");
 151         fprintf(stderr,
 152 "   -minhello len   set minimum ClientHello length (in bytes)\n");
 153         fprintf(stderr,
 154 "   -fallback       send the TLS_FALLBACK_SCSV (i.e. claim a downgrade)\n");
 155         fprintf(stderr,
 156 "   -noreneg        prohibit renegotiations\n");
 157 }
 158
 159 /* see brssl.h */
 160 int
 161 do_client(int argc, char *argv[])
 162 {
 163         int retcode;
 164         int verbose;
 165         int trace;
 166         int i, bidi;
 167         const char *server_name;
 168         char *host;
 169         char *port;
 170         const char *sni;
 171         anchor_list anchors = VEC_INIT;
 172         unsigned vmin, vmax;
 173         cipher_suite *suites;
 174         size_t num_suites;
 175         uint16_t *suite_ids;
 176         unsigned hfuns;
 177         size_t u;
 178         br_ssl_client_context cc;
 179         br_x509_minimal_context xc;
 180         x509_noanchor_context xwc;
 181         const br_hash_class *dnhash;
 182         unsigned char *iobuf;
 183         size_t iobuf_len;
 184         size_t minhello_len;
 185         int fallback;
 186         uint32_t flags;
 187         int fd;
 188
 189         retcode = 0;
 190         verbose = 1;
 191         trace = 0;
 192         server_name = NULL;
 193         host = NULL;
 194         port = NULL;
 195         sni = NULL;
 196         bidi = 1;
 197         vmin = 0;
 198         vmax = 0;
 199         suites = NULL;
 200         num_suites = 0;
 201         hfuns = 0;
 202         suite_ids = NULL;
 203         iobuf = NULL;
 204         iobuf_len = 0;
 205         minhello_len = (size_t)-1;
 206         fallback = 0;
 207         flags = 0;
 208         fd = -1;
 209         for (i = 0; i < argc; i ++) {
 210                 const char *arg;
 211
 212                 arg = argv[i];
 213                 if (arg[0] != '-') {
 214                         if (server_name != NULL) {
 215                                 fprintf(stderr,
 216                                         "ERROR: duplicate server name\n");
 217                                 usage_client();
 218                                 goto client_exit_error;
 219                         }
 220                         server_name = arg;
 221                         continue;
 222                 }
 223                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 224                         verbose = 1;
 225                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 226                         verbose = 0;
 227                 } else if (eqstr(arg, "-trace")) {
 228                         trace = 1;
 229                 } else if (eqstr(arg, "-sni")) {
 230                         if (++ i >= argc) {
 231                                 fprintf(stderr,
 232                                         "ERROR: no argument for '-sni'\n");
 233                                 usage_client();
 234                                 goto client_exit_error;
 235                         }
 236                         if (sni != NULL) {
 237                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 238                                 usage_client();
 239                                 goto client_exit_error;
 240                         }
 241                         sni = argv[i];
 242                 } else if (eqstr(arg, "-nosni")) {
 243                         if (sni != NULL) {
 244                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 245                                 usage_client();
 246                                 goto client_exit_error;
 247                         }
 248                         sni = "";
 249                 } else if (eqstr(arg, "-mono")) {
 250                         bidi = 0;
 251                 } else if (eqstr(arg, "-buf")) {
 252                         if (++ i >= argc) {
 253                                 fprintf(stderr,
 254                                         "ERROR: no argument for '-buf'\n");
 255                                 usage_client();
 256                                 goto client_exit_error;
 257                         }
 258                         arg = argv[i];
 259                         if (iobuf_len != 0) {
 260                                 fprintf(stderr,
 261                                         "ERROR: duplicate I/O buffer length\n");
 262                                 usage_client();
 263                                 goto client_exit_error;
 264                         }
 265                         iobuf_len = parse_size(arg);
 266                         if (iobuf_len == (size_t)-1) {
 267                                 usage_client();
 268                                 goto client_exit_error;
 269                         }
 270                 } else if (eqstr(arg, "-CA")) {
 271                         if (++ i >= argc) {
 272                                 fprintf(stderr,
 273                                         "ERROR: no argument for '-CA'\n");
 274                                 usage_client();
 275                                 goto client_exit_error;
 276                         }
 277                         arg = argv[i];
 278                         if (read_trust_anchors(&anchors, arg) == 0) {
 279                                 usage_client();
 280                                 goto client_exit_error;
 281                         }
 282                 } else if (eqstr(arg, "-list")) {
 283                         list_names();
 284                         goto client_exit;
 285                 } else if (eqstr(arg, "-vmin")) {
 286                         if (++ i >= argc) {
 287                                 fprintf(stderr,
 288                                         "ERROR: no argument for '-vmin'\n");
 289                                 usage_client();
 290                                 goto client_exit_error;
 291                         }
 292                         arg = argv[i];
 293                         if (vmin != 0) {
 294                                 fprintf(stderr,
 295                                         "ERROR: duplicate minimum version\n");
 296                                 usage_client();
 297                                 goto client_exit_error;
 298                         }
 299                         vmin = parse_version(arg, strlen(arg));
 300                         if (vmin == 0) {
 301                                 fprintf(stderr,
 302                                         "ERROR: unrecognised version '%s'\n",
 303                                         arg);
 304                                 usage_client();
 305                                 goto client_exit_error;
 306                         }
 307                 } else if (eqstr(arg, "-vmax")) {
 308                         if (++ i >= argc) {
 309                                 fprintf(stderr,
 310                                         "ERROR: no argument for '-vmax'\n");
 311                                 usage_client();
 312                                 goto client_exit_error;
 313                         }
 314                         arg = argv[i];
 315                         if (vmax != 0) {
 316                                 fprintf(stderr,
 317                                         "ERROR: duplicate maximum version\n");
 318                                 usage_client();
 319                                 goto client_exit_error;
 320                         }
 321                         vmax = parse_version(arg, strlen(arg));
 322                         if (vmax == 0) {
 323                                 fprintf(stderr,
 324                                         "ERROR: unrecognised version '%s'\n",
 325                                         arg);
 326                                 usage_client();
 327                                 goto client_exit_error;
 328                         }
 329                 } else if (eqstr(arg, "-cs")) {
 330                         if (++ i >= argc) {
 331                                 fprintf(stderr,
 332                                         "ERROR: no argument for '-cs'\n");
 333                                 usage_client();
 334                                 goto client_exit_error;
 335                         }
 336                         arg = argv[i];
 337                         if (suites != NULL) {
 338                                 fprintf(stderr, "ERROR: duplicate list"
 339                                         " of cipher suites\n");
 340                                 usage_client();
 341                                 goto client_exit_error;
 342                         }
 343                         suites = parse_suites(arg, &num_suites);
 344                         if (suites == NULL) {
 345                                 usage_client();
 346                                 goto client_exit_error;
 347                         }
 348                 } else if (eqstr(arg, "-hf")) {
 349                         unsigned x;
 350
 351                         if (++ i >= argc) {
 352                                 fprintf(stderr,
 353                                         "ERROR: no argument for '-hf'\n");
 354                                 usage_client();
 355                                 goto client_exit_error;
 356                         }
 357                         arg = argv[i];
 358                         x = parse_hash_functions(arg);
 359                         if (x == 0) {
 360                                 usage_client();
 361                                 goto client_exit_error;
 362                         }
 363                         hfuns |= x;
 364                 } else if (eqstr(arg, "-minhello")) {
 365                         if (++ i >= argc) {
 366                                 fprintf(stderr,
 367                                         "ERROR: no argument for '-minhello'\n");
 368                                 usage_client();
 369                                 goto client_exit_error;
 370                         }
 371                         arg = argv[i];
 372                         if (minhello_len != (size_t)-1) {
 373                                 fprintf(stderr, "ERROR: duplicate minium"
 374                                         " ClientHello length\n");
 375                                 usage_client();
 376                                 goto client_exit_error;
 377                         }
 378                         minhello_len = parse_size(arg);
 379                         /*
 380                          * Minimum ClientHello length must fit on 16 bits.
 381                          */
 382                         if (minhello_len == (size_t)-1
 383                                 || (((minhello_len >> 12) >> 4) != 0))
 384                         {
 385                                 usage_client();
 386                                 goto client_exit_error;
 387                         }
 388                 } else if (eqstr(arg, "-fallback")) {
 389                         fallback = 1;
 390                 } else if (eqstr(arg, "-noreneg")) {
 391                         flags |= BR_OPT_NO_RENEGOTIATION;
 392                 } else {
 393                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 394                         usage_client();
 395                         goto client_exit_error;
 396                 }
 397         }
 398         if (server_name == NULL) {
 399                 fprintf(stderr, "ERROR: no server name/address provided\n");
 400                 usage_client();
 401                 goto client_exit_error;
 402         }
 403         for (u = strlen(server_name); u > 0; u --) {
 404                 int c = server_name[u - 1];
 405                 if (c == ':') {
 406                         break;
 407                 }
 408                 if (c < '0' || c > '9') {
 409                         u = 0;
 410                         break;
 411                 }
 412         }
 413         if (u == 0) {
 414                 host = xstrdup(server_name);
 415                 port = "443";
 416         } else {
 417                 port = xstrdup(server_name + u);
 418                 host = xmalloc(u);
 419                 memcpy(host, server_name, u - 1);
 420                 host[u - 1] = 0;
 421         }
 422         if (sni == NULL) {
 423                 sni = host;
 424         }
 425
 426         if (vmin == 0) {
 427                 vmin = BR_TLS10;
 428         }
 429         if (vmax == 0) {
 430                 vmax = BR_TLS12;
 431         }
 432         if (vmax < vmin) {
 433                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 434                         " version combination\n");
 435                 usage_client();
 436                 goto client_exit_error;
 437         }
 438         if (suites == NULL) {
 439                 num_suites = 0;
 440
 441                 for (u = 0; cipher_suites[u].name; u ++) {
 442                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 443                                 || vmax >= BR_TLS12)
 444                         {
 445                                 num_suites ++;
 446                         }
 447                 }
 448                 suites = xmalloc(num_suites * sizeof *suites);
 449                 num_suites = 0;
 450                 for (u = 0; cipher_suites[u].name; u ++) {
 451                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 452                                 || vmax >= BR_TLS12)
 453                         {
 454                                 suites[num_suites ++] = cipher_suites[u];
 455                         }
 456                 }
 457         }
 458         if (hfuns == 0) {
 459                 hfuns = (unsigned)-1;
 460         }
 461         if (iobuf_len == 0) {
 462                 if (bidi) {
 463                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 464                 } else {
 465                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 466                 }
 467         }
 468         iobuf = xmalloc(iobuf_len);
 469
 470         /*
 471          * Compute implementation requirements and inject implementations.
 472          */
 473         suite_ids = xmalloc((num_suites + 1) * sizeof *suite_ids);
 474         br_ssl_client_zero(&cc);
 475         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 476         dnhash = NULL;
 477         for (u = 0; hash_functions[u].name; u ++) {
 478                 const br_hash_class *hc;
 479                 int id;
 480
 481                 hc = hash_functions[u].hclass;
 482                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 483                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 484                         dnhash = hc;
 485                 }
 486         }
 487         if (dnhash == NULL) {
 488                 fprintf(stderr, "ERROR: no supported hash function\n");
 489                 goto client_exit_error;
 490         }
 491         br_x509_minimal_init(&xc, dnhash,
 492                 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
 493         if (vmin <= BR_TLS11) {
 494                 if (!(hfuns & (1 << br_md5_ID))) {
 495                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 496                         goto client_exit_error;
 497                 }
 498                 if (!(hfuns & (1 << br_sha1_ID))) {
 499                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 500                         goto client_exit_error;
 501                 }
 502         }
 503         for (u = 0; u < num_suites; u ++) {
 504                 unsigned req;
 505
 506                 req = suites[u].req;
 507                 suite_ids[u] = suites[u].suite;
 508                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 509                         fprintf(stderr,
 510                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 511                                 suites[u].name);
 512                         goto client_exit_error;
 513                 }
 514                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 515                         fprintf(stderr,
 516                                 "ERROR: cipher suite %s requires SHA-1\n",
 517                                 suites[u].name);
 518                         goto client_exit_error;
 519                 }
 520                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 521                         fprintf(stderr,
 522                                 "ERROR: cipher suite %s requires SHA-256\n",
 523                                 suites[u].name);
 524                         goto client_exit_error;
 525                 }
 526                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 527                         fprintf(stderr,
 528                                 "ERROR: cipher suite %s requires SHA-384\n",
 529                                 suites[u].name);
 530                         goto client_exit_error;
 531                 }
 532                 /* TODO: algorithm implementation selection */
 533                 if ((req & REQ_AESCBC) != 0) {
 534                         br_ssl_engine_set_aes_cbc(&cc.eng,
 535                                 &br_aes_ct_cbcenc_vtable,
 536                                 &br_aes_ct_cbcdec_vtable);
 537                         br_ssl_engine_set_cbc(&cc.eng,
 538                                 &br_sslrec_in_cbc_vtable,
 539                                 &br_sslrec_out_cbc_vtable);
 540                 }
 541                 if ((req & REQ_AESGCM) != 0) {
 542                         br_ssl_engine_set_aes_ctr(&cc.eng,
 543                                 &br_aes_ct_ctr_vtable);
 544                         br_ssl_engine_set_ghash(&cc.eng,
 545                                 &br_ghash_ctmul);
 546                         br_ssl_engine_set_gcm(&cc.eng,
 547                                 &br_sslrec_in_gcm_vtable,
 548                                 &br_sslrec_out_gcm_vtable);
 549                 }
 550                 if ((req & REQ_3DESCBC) != 0) {
 551                         br_ssl_engine_set_des_cbc(&cc.eng,
 552                                 &br_des_ct_cbcenc_vtable,
 553                                 &br_des_ct_cbcdec_vtable);
 554                         br_ssl_engine_set_cbc(&cc.eng,
 555                                 &br_sslrec_in_cbc_vtable,
 556                                 &br_sslrec_out_cbc_vtable);
 557                 }
 558                 if ((req & REQ_RSAKEYX) != 0) {
 559                         br_ssl_client_set_rsapub(&cc, &br_rsa_i31_public);
 560                 }
 561                 if ((req & REQ_ECDHE_RSA) != 0) {
 562                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 563                         br_ssl_client_set_rsavrfy(&cc, &br_rsa_i31_pkcs1_vrfy);
 564                 }
 565                 if ((req & REQ_ECDHE_ECDSA) != 0) {
 566                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 567                         br_ssl_client_set_ecdsa(&cc, &br_ecdsa_i31_vrfy_asn1);
 568                 }
 569                 if ((req & REQ_ECDH) != 0) {
 570                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 571                 }
 572         }
 573         if (fallback) {
 574                 suite_ids[num_suites ++] = 0x5600;
 575         }
 576         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
 577
 578         for (u = 0; hash_functions[u].name; u ++) {
 579                 const br_hash_class *hc;
 580                 int id;
 581
 582                 hc = hash_functions[u].hclass;
 583                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 584                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 585                         br_ssl_engine_set_hash(&cc.eng, id, hc);
 586                         br_x509_minimal_set_hash(&xc, id, hc);
 587                 }
 588         }
 589         if (vmin <= BR_TLS11) {
 590                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
 591         }
 592         if (vmax >= BR_TLS12) {
 593                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
 594                         br_ssl_engine_set_prf_sha256(&cc.eng,
 595                                 &br_tls12_sha256_prf);
 596                 }
 597                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
 598                         br_ssl_engine_set_prf_sha384(&cc.eng,
 599                                 &br_tls12_sha384_prf);
 600                 }
 601         }
 602         br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
 603         br_x509_minimal_set_ecdsa(&xc,
 604                 &br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
 605
 606         /*
 607          * If there is no provided trust anchor, then certificate validation
 608          * will always fail. In that situation, we use our custom wrapper
 609          * that tolerates unknown anchors.
 610          */
 611         if (VEC_LEN(anchors) == 0) {
 612                 if (verbose) {
 613                         fprintf(stderr,
 614                                 "WARNING: no configured trust anchor\n");
 615                 }
 616                 x509_noanchor_init(&xwc, &xc.vtable);
 617                 br_ssl_engine_set_x509(&cc.eng, &xwc.vtable);
 618         } else {
 619                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
 620         }
 621
 622         if (minhello_len != (size_t)-1) {
 623                 br_ssl_client_set_min_clienthello_len(&cc, minhello_len);
 624         }
 625         br_ssl_engine_set_all_flags(&cc.eng, flags);
 626
 627         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
 628         br_ssl_client_reset(&cc, sni, 0);
 629
 630         /*
 631          * We need to avoid SIGPIPE.
 632          */
 633         signal(SIGPIPE, SIG_IGN);
 634
 635         /*
 636          * Connect to the peer.
 637          */
 638         fd = host_connect(host, port, verbose);
 639         if (fd < 0) {
 640                 goto client_exit_error;
 641         }
 642
 643         /*
 644          * Run the engine until completion.
 645          */
 646         if (run_ssl_engine(&cc.eng, fd,
 647                 (verbose ? RUN_ENGINE_VERBOSE : 0)
 648                 | (trace ? RUN_ENGINE_TRACE : 0)) != 0)
 649         {
 650                 goto client_exit_error;
 651         } else {
 652                 goto client_exit;
 653         }
 654
 655         /*
 656          * Release allocated structures.
 657          */
 658 client_exit:
 659         xfree(host);
 660         xfree(suites);
 661         xfree(suite_ids);
 662         VEC_CLEAREXT(anchors, &free_ta_contents);
 663         xfree(iobuf);
 664         if (fd >= 0) {
 665                 close(fd);
 666         }
 667         return retcode;
 668
 669 client_exit_error:
 670         retcode = -1;
 671         goto client_exit;
 672 }