test/ossl_shim/ossl_shim.cc

   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 #if !defined(__STDC_FORMAT_MACROS)
  11 #define __STDC_FORMAT_MACROS
  12 #endif
  13
  14 #include "packeted_bio.h"
  15 #include <openssl/e_os2.h>
  16
  17 #if !defined(OPENSSL_SYS_WINDOWS)
  18 #include <arpa/inet.h>
  19 #include <netinet/in.h>
  20 #include <netinet/tcp.h>
  21 #include <signal.h>
  22 #include <sys/socket.h>
  23 #include <sys/time.h>
  24 #include <unistd.h>
  25 #else
  26 #include <io.h>
  27 OPENSSL_MSVC_PRAGMA(warning(push, 3))
  28 #include <winsock2.h>
  29 #include <ws2tcpip.h>
  30 OPENSSL_MSVC_PRAGMA(warning(pop))
  31
  32 OPENSSL_MSVC_PRAGMA(comment(lib, "Ws2_32.lib"))
  33 #endif
  34
  35 #include <assert.h>
  36 #include <inttypes.h>
  37 #include <string.h>
  38
  39 #include <openssl/bio.h>
  40 #include <openssl/buffer.h>
  41 #include <openssl/bn.h>
  42 #include <openssl/crypto.h>
  43 #include <openssl/dh.h>
  44 #include <openssl/err.h>
  45 #include <openssl/evp.h>
  46 #include <openssl/hmac.h>
  47 #include <openssl/objects.h>
  48 #include <openssl/rand.h>
  49 #include <openssl/ssl.h>
  50 #include <openssl/x509.h>
  51
  52 #include <memory>
  53 #include <string>
  54 #include <vector>
  55
  56 #include "async_bio.h"
  57 #include "test_config.h"
  58
  59 namespace bssl {
  60
  61 #if !defined(OPENSSL_SYS_WINDOWS)
  62 static int closesocket(int sock) {
  63   return close(sock);
  64 }
  65
  66 static void PrintSocketError(const char *func) {
  67   perror(func);
  68 }
  69 #else
  70 static void PrintSocketError(const char *func) {
  71   fprintf(stderr, "%s: %d\n", func, WSAGetLastError());
  72 }
  73 #endif
  74
  75 static int Usage(const char *program) {
  76   fprintf(stderr, "Usage: %s [flags...]\n", program);
  77   return 1;
  78 }
  79
  80 struct TestState {
  81   // async_bio is async BIO which pauses reads and writes.
  82   BIO *async_bio = nullptr;
  83   // packeted_bio is the packeted BIO which simulates read timeouts.
  84   BIO *packeted_bio = nullptr;
  85   bool cert_ready = false;
  86   bool handshake_done = false;
  87   // private_key is the underlying private key used when testing custom keys.
  88   bssl::UniquePtr<EVP_PKEY> private_key;
  89   bool got_new_session = false;
  90   bssl::UniquePtr<SSL_SESSION> new_session;
  91   bool ticket_decrypt_done = false;
  92   bool alpn_select_done = false;
  93 };
  94
  95 static void TestStateExFree(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
  96                             int index, long argl, void *argp) {
  97   delete ((TestState *)ptr);
  98 }
  99
 100 static int g_config_index = 0;
 101 static int g_state_index = 0;
 102
 103 static bool SetTestConfig(SSL *ssl, const TestConfig *config) {
 104   return SSL_set_ex_data(ssl, g_config_index, (void *)config) == 1;
 105 }
 106
 107 static const TestConfig *GetTestConfig(const SSL *ssl) {
 108   return (const TestConfig *)SSL_get_ex_data(ssl, g_config_index);
 109 }
 110
 111 static bool SetTestState(SSL *ssl, std::unique_ptr<TestState> state) {
 112   // |SSL_set_ex_data| takes ownership of |state| only on success.
 113   if (SSL_set_ex_data(ssl, g_state_index, state.get()) == 1) {
 114     state.release();
 115     return true;
 116   }
 117   return false;
 118 }
 119
 120 static TestState *GetTestState(const SSL *ssl) {
 121   return (TestState *)SSL_get_ex_data(ssl, g_state_index);
 122 }
 123
 124 static bssl::UniquePtr<X509> LoadCertificate(const std::string &file) {
 125   bssl::UniquePtr<BIO> bio(BIO_new(BIO_s_file()));
 126   if (!bio || !BIO_read_filename(bio.get(), file.c_str())) {
 127     return nullptr;
 128   }
 129   return bssl::UniquePtr<X509>(PEM_read_bio_X509(bio.get(), NULL, NULL, NULL));
 130 }
 131
 132 static bssl::UniquePtr<EVP_PKEY> LoadPrivateKey(const std::string &file) {
 133   bssl::UniquePtr<BIO> bio(BIO_new(BIO_s_file()));
 134   if (!bio || !BIO_read_filename(bio.get(), file.c_str())) {
 135     return nullptr;
 136   }
 137   return bssl::UniquePtr<EVP_PKEY>(
 138       PEM_read_bio_PrivateKey(bio.get(), NULL, NULL, NULL));
 139 }
 140
 141 template<typename T>
 142 struct Free {
 143   void operator()(T *buf) {
 144     free(buf);
 145   }
 146 };
 147
 148 static bool GetCertificate(SSL *ssl, bssl::UniquePtr<X509> *out_x509,
 149                            bssl::UniquePtr<EVP_PKEY> *out_pkey) {
 150   const TestConfig *config = GetTestConfig(ssl);
 151
 152   if (!config->key_file.empty()) {
 153     *out_pkey = LoadPrivateKey(config->key_file.c_str());
 154     if (!*out_pkey) {
 155       return false;
 156     }
 157   }
 158   if (!config->cert_file.empty()) {
 159     *out_x509 = LoadCertificate(config->cert_file.c_str());
 160     if (!*out_x509) {
 161       return false;
 162     }
 163   }
 164   return true;
 165 }
 166
 167 static bool InstallCertificate(SSL *ssl) {
 168   bssl::UniquePtr<X509> x509;
 169   bssl::UniquePtr<EVP_PKEY> pkey;
 170   if (!GetCertificate(ssl, &x509, &pkey)) {
 171     return false;
 172   }
 173
 174   if (pkey && !SSL_use_PrivateKey(ssl, pkey.get())) {
 175     return false;
 176   }
 177
 178   if (x509 && !SSL_use_certificate(ssl, x509.get())) {
 179     return false;
 180   }
 181
 182   return true;
 183 }
 184
 185 static int ClientCertCallback(SSL *ssl, X509 **out_x509, EVP_PKEY **out_pkey) {
 186   if (GetTestConfig(ssl)->async && !GetTestState(ssl)->cert_ready) {
 187     return -1;
 188   }
 189
 190   bssl::UniquePtr<X509> x509;
 191   bssl::UniquePtr<EVP_PKEY> pkey;
 192   if (!GetCertificate(ssl, &x509, &pkey)) {
 193     return -1;
 194   }
 195
 196   // Return zero for no certificate.
 197   if (!x509) {
 198     return 0;
 199   }
 200
 201   // Asynchronous private keys are not supported with client_cert_cb.
 202   *out_x509 = x509.release();
 203   *out_pkey = pkey.release();
 204   return 1;
 205 }
 206
 207 static int VerifySucceed(X509_STORE_CTX *store_ctx, void *arg) {
 208   return 1;
 209 }
 210
 211 static int VerifyFail(X509_STORE_CTX *store_ctx, void *arg) {
 212   X509_STORE_CTX_set_error(store_ctx, X509_V_ERR_APPLICATION_VERIFICATION);
 213   return 0;
 214 }
 215
 216 static int NextProtosAdvertisedCallback(SSL *ssl, const uint8_t **out,
 217                                         unsigned int *out_len, void *arg) {
 218   const TestConfig *config = GetTestConfig(ssl);
 219   if (config->advertise_npn.empty()) {
 220     return SSL_TLSEXT_ERR_NOACK;
 221   }
 222
 223   *out = (const uint8_t*)config->advertise_npn.data();
 224   *out_len = config->advertise_npn.size();
 225   return SSL_TLSEXT_ERR_OK;
 226 }
 227
 228 static int NextProtoSelectCallback(SSL* ssl, uint8_t** out, uint8_t* outlen,
 229                                    const uint8_t* in, unsigned inlen, void* arg) {
 230   const TestConfig *config = GetTestConfig(ssl);
 231   if (config->select_next_proto.empty()) {
 232     return SSL_TLSEXT_ERR_NOACK;
 233   }
 234
 235   *out = (uint8_t*)config->select_next_proto.data();
 236   *outlen = config->select_next_proto.size();
 237   return SSL_TLSEXT_ERR_OK;
 238 }
 239
 240 static int AlpnSelectCallback(SSL* ssl, const uint8_t** out, uint8_t* outlen,
 241                               const uint8_t* in, unsigned inlen, void* arg) {
 242   if (GetTestState(ssl)->alpn_select_done) {
 243     fprintf(stderr, "AlpnSelectCallback called after completion.\n");
 244     exit(1);
 245   }
 246
 247   GetTestState(ssl)->alpn_select_done = true;
 248
 249   const TestConfig *config = GetTestConfig(ssl);
 250   if (config->decline_alpn) {
 251     return SSL_TLSEXT_ERR_NOACK;
 252   }
 253
 254   if (!config->expected_advertised_alpn.empty() &&
 255       (config->expected_advertised_alpn.size() != inlen ||
 256        memcmp(config->expected_advertised_alpn.data(),
 257               in, inlen) != 0)) {
 258     fprintf(stderr, "bad ALPN select callback inputs\n");
 259     exit(1);
 260   }
 261
 262   *out = (const uint8_t*)config->select_alpn.data();
 263   *outlen = config->select_alpn.size();
 264   return SSL_TLSEXT_ERR_OK;
 265 }
 266
 267 static unsigned PskClientCallback(SSL *ssl, const char *hint,
 268                                   char *out_identity,
 269                                   unsigned max_identity_len,
 270                                   uint8_t *out_psk, unsigned max_psk_len) {
 271   const TestConfig *config = GetTestConfig(ssl);
 272
 273   if (config->psk_identity.empty()) {
 274     if (hint != nullptr) {
 275       fprintf(stderr, "Server PSK hint was non-null.\n");
 276       return 0;
 277     }
 278   } else if (hint == nullptr ||
 279              strcmp(hint, config->psk_identity.c_str()) != 0) {
 280     fprintf(stderr, "Server PSK hint did not match.\n");
 281     return 0;
 282   }
 283
 284   // Account for the trailing '\0' for the identity.
 285   if (config->psk_identity.size() >= max_identity_len ||
 286       config->psk.size() > max_psk_len) {
 287     fprintf(stderr, "PSK buffers too small\n");
 288     return 0;
 289   }
 290
 291   BUF_strlcpy(out_identity, config->psk_identity.c_str(),
 292               max_identity_len);
 293   memcpy(out_psk, config->psk.data(), config->psk.size());
 294   return config->psk.size();
 295 }
 296
 297 static unsigned PskServerCallback(SSL *ssl, const char *identity,
 298                                   uint8_t *out_psk, unsigned max_psk_len) {
 299   const TestConfig *config = GetTestConfig(ssl);
 300
 301   if (strcmp(identity, config->psk_identity.c_str()) != 0) {
 302     fprintf(stderr, "Client PSK identity did not match.\n");
 303     return 0;
 304   }
 305
 306   if (config->psk.size() > max_psk_len) {
 307     fprintf(stderr, "PSK buffers too small\n");
 308     return 0;
 309   }
 310
 311   memcpy(out_psk, config->psk.data(), config->psk.size());
 312   return config->psk.size();
 313 }
 314
 315 static int CertCallback(SSL *ssl, void *arg) {
 316   const TestConfig *config = GetTestConfig(ssl);
 317
 318   // Check the CertificateRequest metadata is as expected.
 319   //
 320   // TODO(davidben): Test |SSL_get_client_CA_list|.
 321   if (!SSL_is_server(ssl) &&
 322       !config->expected_certificate_types.empty()) {
 323     const uint8_t *certificate_types;
 324     size_t certificate_types_len =
 325         SSL_get0_certificate_types(ssl, &certificate_types);
 326     if (certificate_types_len != config->expected_certificate_types.size() ||
 327         memcmp(certificate_types,
 328                config->expected_certificate_types.data(),
 329                certificate_types_len) != 0) {
 330       fprintf(stderr, "certificate types mismatch\n");
 331       return 0;
 332     }
 333   }
 334
 335   // The certificate will be installed via other means.
 336   if (!config->async ||
 337       config->use_old_client_cert_callback) {
 338     return 1;
 339   }
 340
 341   if (!GetTestState(ssl)->cert_ready) {
 342     return -1;
 343   }
 344   if (!InstallCertificate(ssl)) {
 345     return 0;
 346   }
 347   return 1;
 348 }
 349
 350 static void InfoCallback(const SSL *ssl, int type, int val) {
 351   if (type == SSL_CB_HANDSHAKE_DONE) {
 352     if (GetTestConfig(ssl)->handshake_never_done) {
 353       fprintf(stderr, "Handshake unexpectedly completed.\n");
 354       // Abort before any expected error code is printed, to ensure the overall
 355       // test fails.
 356       abort();
 357     }
 358     GetTestState(ssl)->handshake_done = true;
 359
 360     // Callbacks may be called again on a new handshake.
 361     GetTestState(ssl)->ticket_decrypt_done = false;
 362     GetTestState(ssl)->alpn_select_done = false;
 363   }
 364 }
 365
 366 static int NewSessionCallback(SSL *ssl, SSL_SESSION *session) {
 367   GetTestState(ssl)->got_new_session = true;
 368   GetTestState(ssl)->new_session.reset(session);
 369   return 1;
 370 }
 371
 372 static int TicketKeyCallback(SSL *ssl, uint8_t *key_name, uint8_t *iv,
 373                              EVP_CIPHER_CTX *ctx, HMAC_CTX *hmac_ctx,
 374                              int encrypt) {
 375   if (!encrypt) {
 376     if (GetTestState(ssl)->ticket_decrypt_done) {
 377       fprintf(stderr, "TicketKeyCallback called after completion.\n");
 378       return -1;
 379     }
 380
 381     GetTestState(ssl)->ticket_decrypt_done = true;
 382   }
 383
 384   // This is just test code, so use the all-zeros key.
 385   static const uint8_t kZeros[16] = {0};
 386
 387   if (encrypt) {
 388     memcpy(key_name, kZeros, sizeof(kZeros));
 389     RAND_bytes(iv, 16);
 390   } else if (memcmp(key_name, kZeros, 16) != 0) {
 391     return 0;
 392   }
 393
 394   if (!HMAC_Init_ex(hmac_ctx, kZeros, sizeof(kZeros), EVP_sha256(), NULL) ||
 395       !EVP_CipherInit_ex(ctx, EVP_aes_128_cbc(), NULL, kZeros, iv, encrypt)) {
 396     return -1;
 397   }
 398
 399   if (!encrypt) {
 400     return GetTestConfig(ssl)->renew_ticket ? 2 : 1;
 401   }
 402   return 1;
 403 }
 404
 405 // kCustomExtensionValue is the extension value that the custom extension
 406 // callbacks will add.
 407 static const uint16_t kCustomExtensionValue = 1234;
 408 static void *const kCustomExtensionAddArg =
 409     reinterpret_cast<void *>(kCustomExtensionValue);
 410 static void *const kCustomExtensionParseArg =
 411     reinterpret_cast<void *>(kCustomExtensionValue + 1);
 412 static const char kCustomExtensionContents[] = "custom extension";
 413
 414 static int CustomExtensionAddCallback(SSL *ssl, unsigned extension_value,
 415                                       const uint8_t **out, size_t *out_len,
 416                                       int *out_alert_value, void *add_arg) {
 417   if (extension_value != kCustomExtensionValue ||
 418       add_arg != kCustomExtensionAddArg) {
 419     abort();
 420   }
 421
 422   if (GetTestConfig(ssl)->custom_extension_skip) {
 423     return 0;
 424   }
 425   if (GetTestConfig(ssl)->custom_extension_fail_add) {
 426     return -1;
 427   }
 428
 429   *out = reinterpret_cast<const uint8_t*>(kCustomExtensionContents);
 430   *out_len = sizeof(kCustomExtensionContents) - 1;
 431
 432   return 1;
 433 }
 434
 435 static void CustomExtensionFreeCallback(SSL *ssl, unsigned extension_value,
 436                                         const uint8_t *out, void *add_arg) {
 437   if (extension_value != kCustomExtensionValue ||
 438       add_arg != kCustomExtensionAddArg ||
 439       out != reinterpret_cast<const uint8_t *>(kCustomExtensionContents)) {
 440     abort();
 441   }
 442 }
 443
 444 static int CustomExtensionParseCallback(SSL *ssl, unsigned extension_value,
 445                                         const uint8_t *contents,
 446                                         size_t contents_len,
 447                                         int *out_alert_value, void *parse_arg) {
 448   if (extension_value != kCustomExtensionValue ||
 449       parse_arg != kCustomExtensionParseArg) {
 450     abort();
 451   }
 452
 453   if (contents_len != sizeof(kCustomExtensionContents) - 1 ||
 454       memcmp(contents, kCustomExtensionContents, contents_len) != 0) {
 455     *out_alert_value = SSL_AD_DECODE_ERROR;
 456     return 0;
 457   }
 458
 459   return 1;
 460 }
 461
 462 static int ServerNameCallback(SSL *ssl, int *out_alert, void *arg) {
 463   // SNI must be accessible from the SNI callback.
 464   const TestConfig *config = GetTestConfig(ssl);
 465   const char *server_name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
 466   if (server_name == nullptr ||
 467       std::string(server_name) != config->expected_server_name) {
 468     fprintf(stderr, "servername mismatch (got %s; want %s)\n", server_name,
 469             config->expected_server_name.c_str());
 470     return SSL_TLSEXT_ERR_ALERT_FATAL;
 471   }
 472
 473   return SSL_TLSEXT_ERR_OK;
 474 }
 475
 476 // Connect returns a new socket connected to localhost on |port| or -1 on
 477 // error.
 478 static int Connect(uint16_t port) {
 479   int sock = socket(AF_INET, SOCK_STREAM, 0);
 480   if (sock == -1) {
 481     PrintSocketError("socket");
 482     return -1;
 483   }
 484   int nodelay = 1;
 485   if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 486           reinterpret_cast<const char*>(&nodelay), sizeof(nodelay)) != 0) {
 487     PrintSocketError("setsockopt");
 488     closesocket(sock);
 489     return -1;
 490   }
 491   sockaddr_in sin;
 492   memset(&sin, 0, sizeof(sin));
 493   sin.sin_family = AF_INET;
 494   sin.sin_port = htons(port);
 495   if (!inet_pton(AF_INET, "127.0.0.1", &sin.sin_addr)) {
 496     PrintSocketError("inet_pton");
 497     closesocket(sock);
 498     return -1;
 499   }
 500   if (connect(sock, reinterpret_cast<const sockaddr*>(&sin),
 501               sizeof(sin)) != 0) {
 502     PrintSocketError("connect");
 503     closesocket(sock);
 504     return -1;
 505   }
 506   return sock;
 507 }
 508
 509 class SocketCloser {
 510  public:
 511   explicit SocketCloser(int sock) : sock_(sock) {}
 512   ~SocketCloser() {
 513     // Half-close and drain the socket before releasing it. This seems to be
 514     // necessary for graceful shutdown on Windows. It will also avoid write
 515     // failures in the test runner.
 516 #if defined(OPENSSL_SYS_WINDOWS)
 517     shutdown(sock_, SD_SEND);
 518 #else
 519     shutdown(sock_, SHUT_WR);
 520 #endif
 521     while (true) {
 522       char buf[1024];
 523       if (recv(sock_, buf, sizeof(buf), 0) <= 0) {
 524         break;
 525       }
 526     }
 527     closesocket(sock_);
 528   }
 529
 530  private:
 531   const int sock_;
 532 };
 533
 534 static bssl::UniquePtr<SSL_CTX> SetupCtx(const TestConfig *config) {
 535   const char sess_id_ctx[] = "ossl_shim";
 536   bssl::UniquePtr<SSL_CTX> ssl_ctx(SSL_CTX_new(
 537       config->is_dtls ? DTLS_method() : TLS_method()));
 538   if (!ssl_ctx) {
 539     return nullptr;
 540   }
 541
 542   SSL_CTX_set_security_level(ssl_ctx.get(), 0);
 543 #if 0
 544   /* Disabled for now until we have some TLS1.3 support */
 545   // Enable TLS 1.3 for tests.
 546   if (!config->is_dtls &&
 547       !SSL_CTX_set_max_proto_version(ssl_ctx.get(), TLS1_3_VERSION)) {
 548     return nullptr;
 549   }
 550 #else
 551   /* Ensure we don't negotiate TLSv1.3 until we can handle it */
 552   if (!config->is_dtls &&
 553       !SSL_CTX_set_max_proto_version(ssl_ctx.get(), TLS1_2_VERSION)) {
 554     return nullptr;
 555   }
 556 #endif
 557
 558   std::string cipher_list = "ALL";
 559   if (!config->cipher.empty()) {
 560     cipher_list = config->cipher;
 561     SSL_CTX_set_options(ssl_ctx.get(), SSL_OP_CIPHER_SERVER_PREFERENCE);
 562   }
 563   if (!SSL_CTX_set_cipher_list(ssl_ctx.get(), cipher_list.c_str())) {
 564     return nullptr;
 565   }
 566
 567   DH *tmpdh;
 568
 569   if (config->use_sparse_dh_prime) {
 570     BIGNUM *p, *g;
 571     p = BN_new();
 572     g = BN_new();
 573     tmpdh = DH_new();
 574     if (p == NULL || g == NULL || tmpdh == NULL) {
 575         BN_free(p);
 576         BN_free(g);
 577         DH_free(tmpdh);
 578         return nullptr;
 579     }
 580     // This prime number is 2^1024 + 643 – a value just above a power of two.
 581     // Because of its form, values modulo it are essentially certain to be one
 582     // byte shorter. This is used to test padding of these values.
 583     if (BN_hex2bn(
 584             &p,
 585             "1000000000000000000000000000000000000000000000000000000000000000"
 586             "0000000000000000000000000000000000000000000000000000000000000000"
 587             "0000000000000000000000000000000000000000000000000000000000000000"
 588             "0000000000000000000000000000000000000000000000000000000000000028"
 589             "3") == 0 ||
 590         !BN_set_word(g, 2)) {
 591       BN_free(p);
 592       BN_free(g);
 593       DH_free(tmpdh);
 594       return nullptr;
 595     }
 596     DH_set0_pqg(tmpdh, p, NULL, g);
 597   } else {
 598       tmpdh = DH_get_2048_256();
 599   }
 600
 601   bssl::UniquePtr<DH> dh(tmpdh);
 602
 603   if (!dh || !SSL_CTX_set_tmp_dh(ssl_ctx.get(), dh.get())) {
 604     return nullptr;
 605   }
 606
 607   SSL_CTX_set_session_cache_mode(ssl_ctx.get(), SSL_SESS_CACHE_BOTH);
 608
 609   if (config->use_old_client_cert_callback) {
 610     SSL_CTX_set_client_cert_cb(ssl_ctx.get(), ClientCertCallback);
 611   }
 612
 613   SSL_CTX_set_npn_advertised_cb(
 614       ssl_ctx.get(), NextProtosAdvertisedCallback, NULL);
 615   if (!config->select_next_proto.empty()) {
 616     SSL_CTX_set_next_proto_select_cb(ssl_ctx.get(), NextProtoSelectCallback,
 617                                      NULL);
 618   }
 619
 620   if (!config->select_alpn.empty() || config->decline_alpn) {
 621     SSL_CTX_set_alpn_select_cb(ssl_ctx.get(), AlpnSelectCallback, NULL);
 622   }
 623
 624   SSL_CTX_set_info_callback(ssl_ctx.get(), InfoCallback);
 625   SSL_CTX_sess_set_new_cb(ssl_ctx.get(), NewSessionCallback);
 626
 627   if (config->use_ticket_callback) {
 628     SSL_CTX_set_tlsext_ticket_key_cb(ssl_ctx.get(), TicketKeyCallback);
 629   }
 630
 631   if (config->enable_client_custom_extension &&
 632       !SSL_CTX_add_client_custom_ext(
 633           ssl_ctx.get(), kCustomExtensionValue, CustomExtensionAddCallback,
 634           CustomExtensionFreeCallback, kCustomExtensionAddArg,
 635           CustomExtensionParseCallback, kCustomExtensionParseArg)) {
 636     return nullptr;
 637   }
 638
 639   if (config->enable_server_custom_extension &&
 640       !SSL_CTX_add_server_custom_ext(
 641           ssl_ctx.get(), kCustomExtensionValue, CustomExtensionAddCallback,
 642           CustomExtensionFreeCallback, kCustomExtensionAddArg,
 643           CustomExtensionParseCallback, kCustomExtensionParseArg)) {
 644     return nullptr;
 645   }
 646
 647   if (config->verify_fail) {
 648     SSL_CTX_set_cert_verify_callback(ssl_ctx.get(), VerifyFail, NULL);
 649   } else {
 650     SSL_CTX_set_cert_verify_callback(ssl_ctx.get(), VerifySucceed, NULL);
 651   }
 652
 653   if (config->use_null_client_ca_list) {
 654     SSL_CTX_set_client_CA_list(ssl_ctx.get(), nullptr);
 655   }
 656
 657   if (!SSL_CTX_set_session_id_context(ssl_ctx.get(),
 658                                       (const unsigned char *)sess_id_ctx,
 659                                       sizeof(sess_id_ctx) - 1))
 660     return nullptr;
 661
 662   if (!config->expected_server_name.empty()) {
 663     SSL_CTX_set_tlsext_servername_callback(ssl_ctx.get(), ServerNameCallback);
 664   }
 665
 666   return ssl_ctx;
 667 }
 668
 669 // RetryAsync is called after a failed operation on |ssl| with return code
 670 // |ret|. If the operation should be retried, it simulates one asynchronous
 671 // event and returns true. Otherwise it returns false.
 672 static bool RetryAsync(SSL *ssl, int ret) {
 673   // No error; don't retry.
 674   if (ret >= 0) {
 675     return false;
 676   }
 677
 678   TestState *test_state = GetTestState(ssl);
 679   assert(GetTestConfig(ssl)->async);
 680
 681   if (test_state->packeted_bio != nullptr &&
 682       PacketedBioAdvanceClock(test_state->packeted_bio)) {
 683     // The DTLS retransmit logic silently ignores write failures. So the test
 684     // may progress, allow writes through synchronously.
 685     AsyncBioEnforceWriteQuota(test_state->async_bio, false);
 686     int timeout_ret = DTLSv1_handle_timeout(ssl);
 687     AsyncBioEnforceWriteQuota(test_state->async_bio, true);
 688
 689     if (timeout_ret < 0) {
 690       fprintf(stderr, "Error retransmitting.\n");
 691       return false;
 692     }
 693     return true;
 694   }
 695
 696   // See if we needed to read or write more. If so, allow one byte through on
 697   // the appropriate end to maximally stress the state machine.
 698   switch (SSL_get_error(ssl, ret)) {
 699     case SSL_ERROR_WANT_READ:
 700       AsyncBioAllowRead(test_state->async_bio, 1);
 701       return true;
 702     case SSL_ERROR_WANT_WRITE:
 703       AsyncBioAllowWrite(test_state->async_bio, 1);
 704       return true;
 705     case SSL_ERROR_WANT_X509_LOOKUP:
 706       test_state->cert_ready = true;
 707       return true;
 708     default:
 709       return false;
 710   }
 711 }
 712
 713 // DoRead reads from |ssl|, resolving any asynchronous operations. It returns
 714 // the result value of the final |SSL_read| call.
 715 static int DoRead(SSL *ssl, uint8_t *out, size_t max_out) {
 716   const TestConfig *config = GetTestConfig(ssl);
 717   TestState *test_state = GetTestState(ssl);
 718   int ret;
 719   do {
 720     if (config->async) {
 721       // The DTLS retransmit logic silently ignores write failures. So the test
 722       // may progress, allow writes through synchronously. |SSL_read| may
 723       // trigger a retransmit, so disconnect the write quota.
 724       AsyncBioEnforceWriteQuota(test_state->async_bio, false);
 725     }
 726     ret = config->peek_then_read ? SSL_peek(ssl, out, max_out)
 727                                  : SSL_read(ssl, out, max_out);
 728     if (config->async) {
 729       AsyncBioEnforceWriteQuota(test_state->async_bio, true);
 730     }
 731   } while (config->async && RetryAsync(ssl, ret));
 732
 733   if (config->peek_then_read && ret > 0) {
 734     std::unique_ptr<uint8_t[]> buf(new uint8_t[static_cast<size_t>(ret)]);
 735
 736     // SSL_peek should synchronously return the same data.
 737     int ret2 = SSL_peek(ssl, buf.get(), ret);
 738     if (ret2 != ret ||
 739         memcmp(buf.get(), out, ret) != 0) {
 740       fprintf(stderr, "First and second SSL_peek did not match.\n");
 741       return -1;
 742     }
 743
 744     // SSL_read should synchronously return the same data and consume it.
 745     ret2 = SSL_read(ssl, buf.get(), ret);
 746     if (ret2 != ret ||
 747         memcmp(buf.get(), out, ret) != 0) {
 748       fprintf(stderr, "SSL_peek and SSL_read did not match.\n");
 749       return -1;
 750     }
 751   }
 752
 753   return ret;
 754 }
 755
 756 // WriteAll writes |in_len| bytes from |in| to |ssl|, resolving any asynchronous
 757 // operations. It returns the result of the final |SSL_write| call.
 758 static int WriteAll(SSL *ssl, const uint8_t *in, size_t in_len) {
 759   const TestConfig *config = GetTestConfig(ssl);
 760   int ret;
 761   do {
 762     ret = SSL_write(ssl, in, in_len);
 763     if (ret > 0) {
 764       in += ret;
 765       in_len -= ret;
 766     }
 767   } while ((config->async && RetryAsync(ssl, ret)) || (ret > 0 && in_len > 0));
 768   return ret;
 769 }
 770
 771 // DoShutdown calls |SSL_shutdown|, resolving any asynchronous operations. It
 772 // returns the result of the final |SSL_shutdown| call.
 773 static int DoShutdown(SSL *ssl) {
 774   const TestConfig *config = GetTestConfig(ssl);
 775   int ret;
 776   do {
 777     ret = SSL_shutdown(ssl);
 778   } while (config->async && RetryAsync(ssl, ret));
 779   return ret;
 780 }
 781
 782 static uint16_t GetProtocolVersion(const SSL *ssl) {
 783   uint16_t version = SSL_version(ssl);
 784   if (!SSL_is_dtls(ssl)) {
 785     return version;
 786   }
 787   return 0x0201 + ~version;
 788 }
 789
 790 // CheckHandshakeProperties checks, immediately after |ssl| completes its
 791 // initial handshake (or False Starts), whether all the properties are
 792 // consistent with the test configuration and invariants.
 793 static bool CheckHandshakeProperties(SSL *ssl, bool is_resume) {
 794   const TestConfig *config = GetTestConfig(ssl);
 795
 796   if (SSL_get_current_cipher(ssl) == nullptr) {
 797     fprintf(stderr, "null cipher after handshake\n");
 798     return false;
 799   }
 800
 801   if (is_resume &&
 802       (!!SSL_session_reused(ssl) == config->expect_session_miss)) {
 803     fprintf(stderr, "session was%s reused\n",
 804             SSL_session_reused(ssl) ? "" : " not");
 805     return false;
 806   }
 807
 808   if (!GetTestState(ssl)->handshake_done) {
 809     fprintf(stderr, "handshake was not completed\n");
 810     return false;
 811   }
 812
 813   if (!config->is_server) {
 814     bool expect_new_session =
 815         !config->expect_no_session &&
 816         (!SSL_session_reused(ssl) || config->expect_ticket_renewal) &&
 817         // Session tickets are sent post-handshake in TLS 1.3.
 818         GetProtocolVersion(ssl) < TLS1_3_VERSION;
 819     if (expect_new_session != GetTestState(ssl)->got_new_session) {
 820       fprintf(stderr,
 821               "new session was%s cached, but we expected the opposite\n",
 822               GetTestState(ssl)->got_new_session ? "" : " not");
 823       return false;
 824     }
 825   }
 826
 827   if (!config->expected_server_name.empty()) {
 828     const char *server_name =
 829         SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
 830     if (server_name == nullptr ||
 831             std::string(server_name) != config->expected_server_name) {
 832       fprintf(stderr, "servername mismatch (got %s; want %s)\n",
 833               server_name, config->expected_server_name.c_str());
 834       return false;
 835     }
 836   }
 837
 838   if (!config->expected_next_proto.empty()) {
 839     const uint8_t *next_proto;
 840     unsigned next_proto_len;
 841     SSL_get0_next_proto_negotiated(ssl, &next_proto, &next_proto_len);
 842     if (next_proto_len != config->expected_next_proto.size() ||
 843         memcmp(next_proto, config->expected_next_proto.data(),
 844                next_proto_len) != 0) {
 845       fprintf(stderr, "negotiated next proto mismatch\n");
 846       return false;
 847     }
 848   }
 849
 850   if (!config->expected_alpn.empty()) {
 851     const uint8_t *alpn_proto;
 852     unsigned alpn_proto_len;
 853     SSL_get0_alpn_selected(ssl, &alpn_proto, &alpn_proto_len);
 854     if (alpn_proto_len != config->expected_alpn.size() ||
 855         memcmp(alpn_proto, config->expected_alpn.data(),
 856                alpn_proto_len) != 0) {
 857       fprintf(stderr, "negotiated alpn proto mismatch\n");
 858       return false;
 859     }
 860   }
 861
 862   if (config->expect_extended_master_secret) {
 863     if (!SSL_get_extms_support(ssl)) {
 864       fprintf(stderr, "No EMS for connection when expected");
 865       return false;
 866     }
 867   }
 868
 869   if (config->expect_verify_result) {
 870     int expected_verify_result = config->verify_fail ?
 871       X509_V_ERR_APPLICATION_VERIFICATION :
 872       X509_V_OK;
 873
 874     if (SSL_get_verify_result(ssl) != expected_verify_result) {
 875       fprintf(stderr, "Wrong certificate verification result\n");
 876       return false;
 877     }
 878   }
 879
 880   if (!config->psk.empty()) {
 881     if (SSL_get_peer_cert_chain(ssl) != nullptr) {
 882       fprintf(stderr, "Received peer certificate on a PSK cipher.\n");
 883       return false;
 884     }
 885   } else if (!config->is_server || config->require_any_client_certificate) {
 886     if (SSL_get_peer_certificate(ssl) == nullptr) {
 887       fprintf(stderr, "Received no peer certificate but expected one.\n");
 888       return false;
 889     }
 890   }
 891
 892   return true;
 893 }
 894
 895 // DoExchange runs a test SSL exchange against the peer. On success, it returns
 896 // true and sets |*out_session| to the negotiated SSL session. If the test is a
 897 // resumption attempt, |is_resume| is true and |session| is the session from the
 898 // previous exchange.
 899 static bool DoExchange(bssl::UniquePtr<SSL_SESSION> *out_session,
 900                        SSL_CTX *ssl_ctx, const TestConfig *config,
 901                        bool is_resume, SSL_SESSION *session) {
 902   bssl::UniquePtr<SSL> ssl(SSL_new(ssl_ctx));
 903   if (!ssl) {
 904     return false;
 905   }
 906
 907   if (!SetTestConfig(ssl.get(), config) ||
 908       !SetTestState(ssl.get(), std::unique_ptr<TestState>(new TestState))) {
 909     return false;
 910   }
 911
 912   if (config->fallback_scsv &&
 913       !SSL_set_mode(ssl.get(), SSL_MODE_SEND_FALLBACK_SCSV)) {
 914     return false;
 915   }
 916   // Install the certificate synchronously if nothing else will handle it.
 917   if (!config->use_old_client_cert_callback &&
 918       !config->async &&
 919       !InstallCertificate(ssl.get())) {
 920     return false;
 921   }
 922   SSL_set_cert_cb(ssl.get(), CertCallback, nullptr);
 923   if (config->require_any_client_certificate) {
 924     SSL_set_verify(ssl.get(), SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
 925                    NULL);
 926   }
 927   if (config->verify_peer) {
 928     SSL_set_verify(ssl.get(), SSL_VERIFY_PEER, NULL);
 929   }
 930   if (config->partial_write) {
 931     SSL_set_mode(ssl.get(), SSL_MODE_ENABLE_PARTIAL_WRITE);
 932   }
 933   if (config->no_tls13) {
 934     SSL_set_options(ssl.get(), SSL_OP_NO_TLSv1_3);
 935   }
 936   if (config->no_tls12) {
 937     SSL_set_options(ssl.get(), SSL_OP_NO_TLSv1_2);
 938   }
 939   if (config->no_tls11) {
 940     SSL_set_options(ssl.get(), SSL_OP_NO_TLSv1_1);
 941   }
 942   if (config->no_tls1) {
 943     SSL_set_options(ssl.get(), SSL_OP_NO_TLSv1);
 944   }
 945   if (config->no_ssl3) {
 946     SSL_set_options(ssl.get(), SSL_OP_NO_SSLv3);
 947   }
 948   if (!config->host_name.empty() &&
 949       !SSL_set_tlsext_host_name(ssl.get(), config->host_name.c_str())) {
 950     return false;
 951   }
 952   if (!config->advertise_alpn.empty() &&
 953       SSL_set_alpn_protos(ssl.get(),
 954                           (const uint8_t *)config->advertise_alpn.data(),
 955                           config->advertise_alpn.size()) != 0) {
 956     return false;
 957   }
 958   if (!config->psk.empty()) {
 959     SSL_set_psk_client_callback(ssl.get(), PskClientCallback);
 960     SSL_set_psk_server_callback(ssl.get(), PskServerCallback);
 961   }
 962   if (!config->psk_identity.empty() &&
 963       !SSL_use_psk_identity_hint(ssl.get(), config->psk_identity.c_str())) {
 964     return false;
 965   }
 966   if (!config->srtp_profiles.empty() &&
 967       SSL_set_tlsext_use_srtp(ssl.get(), config->srtp_profiles.c_str())) {
 968     return false;
 969   }
 970   if (config->min_version != 0 &&
 971       !SSL_set_min_proto_version(ssl.get(), (uint16_t)config->min_version)) {
 972     return false;
 973   }
 974   if (config->max_version != 0 &&
 975       !SSL_set_max_proto_version(ssl.get(), (uint16_t)config->max_version)) {
 976     return false;
 977   }
 978   if (config->mtu != 0) {
 979     SSL_set_options(ssl.get(), SSL_OP_NO_QUERY_MTU);
 980     SSL_set_mtu(ssl.get(), config->mtu);
 981   }
 982   if (config->renegotiate_freely) {
 983     // This is always on for OpenSSL.
 984   }
 985   if (!config->check_close_notify) {
 986     SSL_set_quiet_shutdown(ssl.get(), 1);
 987   }
 988   if (config->p384_only) {
 989     int nid = NID_secp384r1;
 990     if (!SSL_set1_curves(ssl.get(), &nid, 1)) {
 991       return false;
 992     }
 993   }
 994   if (config->enable_all_curves) {
 995     static const int kAllCurves[] = {
 996       NID_X25519, NID_X9_62_prime256v1, NID_X448, NID_secp521r1, NID_secp384r1
 997     };
 998     if (!SSL_set1_curves(ssl.get(), kAllCurves,
 999                          OPENSSL_ARRAY_SIZE(kAllCurves))) {
1000       return false;
1001     }
1002   }
1003   if (config->max_cert_list > 0) {
1004     SSL_set_max_cert_list(ssl.get(), config->max_cert_list);
1005   }
1006
1007   if (!config->async) {
1008     SSL_set_mode(ssl.get(), SSL_MODE_AUTO_RETRY);
1009   }
1010
1011   int sock = Connect(config->port);
1012   if (sock == -1) {
1013     return false;
1014   }
1015   SocketCloser closer(sock);
1016
1017   bssl::UniquePtr<BIO> bio(BIO_new_socket(sock, BIO_NOCLOSE));
1018   if (!bio) {
1019     return false;
1020   }
1021   if (config->is_dtls) {
1022     bssl::UniquePtr<BIO> packeted = PacketedBioCreate(!config->async);
1023     if (!packeted) {
1024       return false;
1025     }
1026     GetTestState(ssl.get())->packeted_bio = packeted.get();
1027     BIO_push(packeted.get(), bio.release());
1028     bio = std::move(packeted);
1029   }
1030   if (config->async) {
1031     bssl::UniquePtr<BIO> async_scoped =
1032         config->is_dtls ? AsyncBioCreateDatagram() : AsyncBioCreate();
1033     if (!async_scoped) {
1034       return false;
1035     }
1036     BIO_push(async_scoped.get(), bio.release());
1037     GetTestState(ssl.get())->async_bio = async_scoped.get();
1038     bio = std::move(async_scoped);
1039   }
1040   SSL_set_bio(ssl.get(), bio.get(), bio.get());
1041   bio.release();  // SSL_set_bio takes ownership.
1042
1043   if (session != NULL) {
1044     if (!config->is_server) {
1045       if (SSL_set_session(ssl.get(), session) != 1) {
1046         return false;
1047       }
1048     }
1049   }
1050
1051 #if 0
1052   // KNOWN BUG: OpenSSL's SSL_get_current_cipher behaves incorrectly when
1053   // offering resumption.
1054   if (SSL_get_current_cipher(ssl.get()) != nullptr) {
1055     fprintf(stderr, "non-null cipher before handshake\n");
1056     return false;
1057   }
1058 #endif
1059
1060   int ret;
1061   if (config->implicit_handshake) {
1062     if (config->is_server) {
1063       SSL_set_accept_state(ssl.get());
1064     } else {
1065       SSL_set_connect_state(ssl.get());
1066     }
1067   } else {
1068     do {
1069       if (config->is_server) {
1070         ret = SSL_accept(ssl.get());
1071       } else {
1072         ret = SSL_connect(ssl.get());
1073       }
1074     } while (config->async && RetryAsync(ssl.get(), ret));
1075     if (ret != 1 ||
1076         !CheckHandshakeProperties(ssl.get(), is_resume)) {
1077       return false;
1078     }
1079
1080     // Reset the state to assert later that the callback isn't called in
1081     // renegotiations.
1082     GetTestState(ssl.get())->got_new_session = false;
1083   }
1084
1085   if (config->export_keying_material > 0) {
1086     std::vector<uint8_t> result(
1087         static_cast<size_t>(config->export_keying_material));
1088     if (SSL_export_keying_material(
1089             ssl.get(), result.data(), result.size(),
1090             config->export_label.data(), config->export_label.size(),
1091             reinterpret_cast<const uint8_t*>(config->export_context.data()),
1092             config->export_context.size(), config->use_export_context) != 1) {
1093       fprintf(stderr, "failed to export keying material\n");
1094       return false;
1095     }
1096     if (WriteAll(ssl.get(), result.data(), result.size()) < 0) {
1097       return false;
1098     }
1099   }
1100
1101   if (config->write_different_record_sizes) {
1102     if (config->is_dtls) {
1103       fprintf(stderr, "write_different_record_sizes not supported for DTLS\n");
1104       return false;
1105     }
1106     // This mode writes a number of different record sizes in an attempt to
1107     // trip up the CBC record splitting code.
1108     static const size_t kBufLen = 32769;
1109     std::unique_ptr<uint8_t[]> buf(new uint8_t[kBufLen]);
1110     memset(buf.get(), 0x42, kBufLen);
1111     static const size_t kRecordSizes[] = {
1112         0, 1, 255, 256, 257, 16383, 16384, 16385, 32767, 32768, 32769};
1113     for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kRecordSizes); i++) {
1114       const size_t len = kRecordSizes[i];
1115       if (len > kBufLen) {
1116         fprintf(stderr, "Bad kRecordSizes value.\n");
1117         return false;
1118       }
1119       if (WriteAll(ssl.get(), buf.get(), len) < 0) {
1120         return false;
1121       }
1122     }
1123   } else {
1124     if (config->shim_writes_first) {
1125       if (WriteAll(ssl.get(), reinterpret_cast<const uint8_t *>("hello"),
1126                    5) < 0) {
1127         return false;
1128       }
1129     }
1130     if (!config->shim_shuts_down) {
1131       for (;;) {
1132         static const size_t kBufLen = 16384;
1133         std::unique_ptr<uint8_t[]> buf(new uint8_t[kBufLen]);
1134
1135         // Read only 512 bytes at a time in TLS to ensure records may be
1136         // returned in multiple reads.
1137         int n = DoRead(ssl.get(), buf.get(), config->is_dtls ? kBufLen : 512);
1138         int err = SSL_get_error(ssl.get(), n);
1139         if (err == SSL_ERROR_ZERO_RETURN ||
1140             (n == 0 && err == SSL_ERROR_SYSCALL)) {
1141           if (n != 0) {
1142             fprintf(stderr, "Invalid SSL_get_error output\n");
1143             return false;
1144           }
1145           // Stop on either clean or unclean shutdown.
1146           break;
1147         } else if (err != SSL_ERROR_NONE) {
1148           if (n > 0) {
1149             fprintf(stderr, "Invalid SSL_get_error output\n");
1150             return false;
1151           }
1152           return false;
1153         }
1154         // Successfully read data.
1155         if (n <= 0) {
1156           fprintf(stderr, "Invalid SSL_get_error output\n");
1157           return false;
1158         }
1159
1160         // After a successful read, with or without False Start, the handshake
1161         // must be complete.
1162         if (!GetTestState(ssl.get())->handshake_done) {
1163           fprintf(stderr, "handshake was not completed after SSL_read\n");
1164           return false;
1165         }
1166
1167         for (int i = 0; i < n; i++) {
1168           buf[i] ^= 0xff;
1169         }
1170         if (WriteAll(ssl.get(), buf.get(), n) < 0) {
1171           return false;
1172         }
1173       }
1174     }
1175   }
1176
1177   if (!config->is_server &&
1178       !config->implicit_handshake &&
1179       // Session tickets are sent post-handshake in TLS 1.3.
1180       GetProtocolVersion(ssl.get()) < TLS1_3_VERSION &&
1181       GetTestState(ssl.get())->got_new_session) {
1182     fprintf(stderr, "new session was established after the handshake\n");
1183     return false;
1184   }
1185
1186   if (GetProtocolVersion(ssl.get()) >= TLS1_3_VERSION && !config->is_server) {
1187     bool expect_new_session =
1188         !config->expect_no_session && !config->shim_shuts_down;
1189     if (expect_new_session != GetTestState(ssl.get())->got_new_session) {
1190       fprintf(stderr,
1191               "new session was%s cached, but we expected the opposite\n",
1192               GetTestState(ssl.get())->got_new_session ? "" : " not");
1193       return false;
1194     }
1195   }
1196
1197   if (out_session) {
1198     *out_session = std::move(GetTestState(ssl.get())->new_session);
1199   }
1200
1201   ret = DoShutdown(ssl.get());
1202
1203   if (config->shim_shuts_down && config->check_close_notify) {
1204     // We initiate shutdown, so |SSL_shutdown| will return in two stages. First
1205     // it returns zero when our close_notify is sent, then one when the peer's
1206     // is received.
1207     if (ret != 0) {
1208       fprintf(stderr, "Unexpected SSL_shutdown result: %d != 0\n", ret);
1209       return false;
1210     }
1211     ret = DoShutdown(ssl.get());
1212   }
1213
1214   if (ret != 1) {
1215     fprintf(stderr, "Unexpected SSL_shutdown result: %d != 1\n", ret);
1216     return false;
1217   }
1218
1219   if (SSL_total_renegotiations(ssl.get()) !=
1220       config->expect_total_renegotiations) {
1221     fprintf(stderr, "Expected %d renegotiations, got %ld\n",
1222             config->expect_total_renegotiations,
1223             SSL_total_renegotiations(ssl.get()));
1224     return false;
1225   }
1226
1227   return true;
1228 }
1229
1230 class StderrDelimiter {
1231  public:
1232   ~StderrDelimiter() { fprintf(stderr, "--- DONE ---\n"); }
1233 };
1234
1235 static int Main(int argc, char **argv) {
1236   // To distinguish ASan's output from ours, add a trailing message to stderr.
1237   // Anything following this line will be considered an error.
1238   StderrDelimiter delimiter;
1239
1240 #if defined(OPENSSL_SYS_WINDOWS)
1241   /* Initialize Winsock. */
1242   WORD wsa_version = MAKEWORD(2, 2);
1243   WSADATA wsa_data;
1244   int wsa_err = WSAStartup(wsa_version, &wsa_data);
1245   if (wsa_err != 0) {
1246     fprintf(stderr, "WSAStartup failed: %d\n", wsa_err);
1247     return 1;
1248   }
1249   if (wsa_data.wVersion != wsa_version) {
1250     fprintf(stderr, "Didn't get expected version: %x\n", wsa_data.wVersion);
1251     return 1;
1252   }
1253 #else
1254   signal(SIGPIPE, SIG_IGN);
1255 #endif
1256
1257   OPENSSL_init_crypto(0, NULL);
1258   OPENSSL_init_ssl(0, NULL);
1259   g_config_index = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL);
1260   g_state_index = SSL_get_ex_new_index(0, NULL, NULL, NULL, TestStateExFree);
1261   if (g_config_index < 0 || g_state_index < 0) {
1262     return 1;
1263   }
1264
1265   TestConfig config;
1266   if (!ParseConfig(argc - 1, argv + 1, &config)) {
1267     return Usage(argv[0]);
1268   }
1269
1270   bssl::UniquePtr<SSL_CTX> ssl_ctx = SetupCtx(&config);
1271   if (!ssl_ctx) {
1272     ERR_print_errors_fp(stderr);
1273     return 1;
1274   }
1275
1276   bssl::UniquePtr<SSL_SESSION> session;
1277   for (int i = 0; i < config.resume_count + 1; i++) {
1278     bool is_resume = i > 0;
1279     if (is_resume && !config.is_server && !session) {
1280       fprintf(stderr, "No session to offer.\n");
1281       return 1;
1282     }
1283
1284     bssl::UniquePtr<SSL_SESSION> offer_session = std::move(session);
1285     if (!DoExchange(&session, ssl_ctx.get(), &config, is_resume,
1286                     offer_session.get())) {
1287       fprintf(stderr, "Connection %d failed.\n", i + 1);
1288       ERR_print_errors_fp(stderr);
1289       return 1;
1290     }
1291   }
1292
1293   return 0;
1294 }
1295
1296 }  // namespace bssl
1297
1298 int main(int argc, char **argv) {
1299   return bssl::Main(argc, argv);
1300 }