dlls/winhttp/net.c

   1 /*
   2  * Copyright 2008 Hans Leidekker for CodeWeavers
   3  * Copyright 2013 Jacek Caban for CodeWeavers
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  18  */
  19
  20 #include <assert.h>
  21 #include <stdarg.h>
  22
  23 #define NONAMELESSUNION
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "ws2tcpip.h"
  27 #include "winhttp.h"
  28 #include "schannel.h"
  29
  30 #include "wine/debug.h"
  31 #include "winhttp_private.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(winhttp);
  34
  35 static int sock_send(int fd, const void *msg, size_t len, int flags)
  36 {
  37     int ret;
  38     do
  39     {
  40         if ((ret = send(fd, msg, len, flags)) == -1) WARN("send error %u\n", WSAGetLastError());
  41     }
  42     while(ret == -1 && WSAGetLastError() == WSAEINTR);
  43     return ret;
  44 }
  45
  46 static int sock_recv(int fd, void *msg, size_t len, int flags)
  47 {
  48     int ret;
  49     do
  50     {
  51         if ((ret = recv(fd, msg, len, flags)) == -1) WARN("recv error %u\n", WSAGetLastError());
  52     }
  53     while(ret == -1 && WSAGetLastError() == WSAEINTR);
  54     return ret;
  55 }
  56
  57 static DWORD netconn_verify_cert( PCCERT_CONTEXT cert, WCHAR *server, DWORD security_flags, BOOL check_revocation )
  58 {
  59     HCERTSTORE store = cert->hCertStore;
  60     BOOL ret;
  61     CERT_CHAIN_PARA chainPara = { sizeof(chainPara), { 0 } };
  62     PCCERT_CHAIN_CONTEXT chain;
  63     char oid_server_auth[] = szOID_PKIX_KP_SERVER_AUTH;
  64     char *server_auth[] = { oid_server_auth };
  65     DWORD err = ERROR_SUCCESS;
  66
  67     TRACE("verifying %s\n", debugstr_w( server ));
  68     chainPara.RequestedUsage.Usage.cUsageIdentifier = 1;
  69     chainPara.RequestedUsage.Usage.rgpszUsageIdentifier = server_auth;
  70     ret = CertGetCertificateChain( NULL, cert, NULL, store, &chainPara,
  71                                    check_revocation ? CERT_CHAIN_REVOCATION_CHECK_CHAIN_EXCLUDE_ROOT : 0,
  72                                    NULL, &chain );
  73     if (ret)
  74     {
  75         if (chain->TrustStatus.dwErrorStatus)
  76         {
  77             static const DWORD supportedErrors =
  78                 CERT_TRUST_IS_NOT_TIME_VALID |
  79                 CERT_TRUST_IS_UNTRUSTED_ROOT |
  80                 CERT_TRUST_IS_NOT_VALID_FOR_USAGE;
  81
  82             if (chain->TrustStatus.dwErrorStatus & CERT_TRUST_IS_NOT_TIME_VALID)
  83             {
  84                 if (!(security_flags & SECURITY_FLAG_IGNORE_CERT_DATE_INVALID))
  85                     err = ERROR_WINHTTP_SECURE_CERT_DATE_INVALID;
  86             }
  87             else if ((chain->TrustStatus.dwErrorStatus &
  88                       CERT_TRUST_IS_UNTRUSTED_ROOT) ||
  89                      (chain->TrustStatus.dwErrorStatus &
  90                       CERT_TRUST_IS_PARTIAL_CHAIN))
  91             {
  92                 if (!(security_flags & SECURITY_FLAG_IGNORE_UNKNOWN_CA))
  93                     err = ERROR_WINHTTP_SECURE_INVALID_CA;
  94             }
  95             else if ((chain->TrustStatus.dwErrorStatus &
  96                       CERT_TRUST_IS_OFFLINE_REVOCATION) ||
  97                      (chain->TrustStatus.dwErrorStatus &
  98                       CERT_TRUST_REVOCATION_STATUS_UNKNOWN))
  99                 err = ERROR_WINHTTP_SECURE_CERT_REV_FAILED;
 100             else if (chain->TrustStatus.dwErrorStatus & CERT_TRUST_IS_REVOKED)
 101                 err = ERROR_WINHTTP_SECURE_CERT_REVOKED;
 102             else if (chain->TrustStatus.dwErrorStatus &
 103                 CERT_TRUST_IS_NOT_VALID_FOR_USAGE)
 104             {
 105                 if (!(security_flags & SECURITY_FLAG_IGNORE_CERT_WRONG_USAGE))
 106                     err = ERROR_WINHTTP_SECURE_CERT_WRONG_USAGE;
 107             }
 108             else if (chain->TrustStatus.dwErrorStatus & ~supportedErrors)
 109                 err = ERROR_WINHTTP_SECURE_INVALID_CERT;
 110         }
 111         if (!err)
 112         {
 113             CERT_CHAIN_POLICY_PARA policyPara;
 114             SSL_EXTRA_CERT_CHAIN_POLICY_PARA sslExtraPolicyPara;
 115             CERT_CHAIN_POLICY_STATUS policyStatus;
 116             CERT_CHAIN_CONTEXT chainCopy;
 117
 118             /* Clear chain->TrustStatus.dwErrorStatus so
 119              * CertVerifyCertificateChainPolicy will verify additional checks
 120              * rather than stopping with an existing, ignored error.
 121              */
 122             memcpy(&chainCopy, chain, sizeof(chainCopy));
 123             chainCopy.TrustStatus.dwErrorStatus = 0;
 124             sslExtraPolicyPara.u.cbSize = sizeof(sslExtraPolicyPara);
 125             sslExtraPolicyPara.dwAuthType = AUTHTYPE_SERVER;
 126             sslExtraPolicyPara.pwszServerName = server;
 127             sslExtraPolicyPara.fdwChecks = security_flags;
 128             policyPara.cbSize = sizeof(policyPara);
 129             policyPara.dwFlags = 0;
 130             policyPara.pvExtraPolicyPara = &sslExtraPolicyPara;
 131             ret = CertVerifyCertificateChainPolicy( CERT_CHAIN_POLICY_SSL,
 132                                                     &chainCopy, &policyPara,
 133                                                     &policyStatus );
 134             /* Any error in the policy status indicates that the
 135              * policy couldn't be verified.
 136              */
 137             if (ret && policyStatus.dwError)
 138             {
 139                 if (policyStatus.dwError == CERT_E_CN_NO_MATCH)
 140                     err = ERROR_WINHTTP_SECURE_CERT_CN_INVALID;
 141                 else
 142                     err = ERROR_WINHTTP_SECURE_INVALID_CERT;
 143             }
 144         }
 145         CertFreeCertificateChain( chain );
 146     }
 147     else
 148         err = ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 149     TRACE("returning %08x\n", err);
 150     return err;
 151 }
 152
 153 static BOOL winsock_loaded;
 154
 155 void netconn_unload( void )
 156 {
 157     if (winsock_loaded) WSACleanup();
 158 }
 159
 160 static BOOL WINAPI winsock_startup( INIT_ONCE *once, void *param, void **ctx )
 161 {
 162     int ret;
 163     WSADATA data;
 164     if (!(ret = WSAStartup( MAKEWORD(1,1), &data ))) winsock_loaded = TRUE;
 165     else ERR( "WSAStartup failed: %d\n", ret );
 166     return TRUE;
 167 }
 168
 169 static void winsock_init(void)
 170 {
 171     static INIT_ONCE once = INIT_ONCE_STATIC_INIT;
 172     InitOnceExecuteOnce( &once, winsock_startup, NULL, NULL );
 173 }
 174
 175 static void set_blocking( struct netconn *conn, BOOL blocking )
 176 {
 177     ULONG state = !blocking;
 178     ioctlsocket( conn->socket, FIONBIO, &state );
 179 }
 180
 181 DWORD netconn_create( struct hostdata *host, const struct sockaddr_storage *sockaddr, int timeout,
 182                       struct netconn **ret_conn )
 183 {
 184     struct netconn *conn;
 185     unsigned int addr_len;
 186     DWORD ret;
 187
 188     winsock_init();
 189
 190     if (!(conn = calloc( 1, sizeof(*conn) ))) return ERROR_OUTOFMEMORY;
 191     conn->host = host;
 192     conn->sockaddr = *sockaddr;
 193     if ((conn->socket = socket( sockaddr->ss_family, SOCK_STREAM, 0 )) == -1)
 194     {
 195         ret = WSAGetLastError();
 196         WARN("unable to create socket (%u)\n", ret);
 197         free( conn );
 198         return ret;
 199     }
 200
 201     switch (conn->sockaddr.ss_family)
 202     {
 203     case AF_INET:
 204         addr_len = sizeof(struct sockaddr_in);
 205         break;
 206     case AF_INET6:
 207         addr_len = sizeof(struct sockaddr_in6);
 208         break;
 209     default:
 210         ERR( "unhandled family %u\n", conn->sockaddr.ss_family );
 211         free( conn );
 212         return ERROR_INVALID_PARAMETER;
 213     }
 214
 215     if (timeout > 0) set_blocking( conn, FALSE );
 216
 217     if (!connect( conn->socket, (const struct sockaddr *)&conn->sockaddr, addr_len )) ret = ERROR_SUCCESS;
 218     else
 219     {
 220         ret = WSAGetLastError();
 221         if (ret == WSAEWOULDBLOCK || ret == WSAEINPROGRESS)
 222         {
 223             FD_SET set;
 224             TIMEVAL timeval = { 0, timeout * 1000 };
 225             int res;
 226
 227             FD_ZERO( &set );
 228             FD_SET( conn->socket, &set );
 229             if ((res = select( conn->socket + 1, NULL, &set, NULL, &timeval )) > 0) ret = ERROR_SUCCESS;
 230             else if (!res) ret = ERROR_WINHTTP_TIMEOUT;
 231         }
 232     }
 233
 234     if (timeout > 0) set_blocking( conn, TRUE );
 235
 236     if (ret)
 237     {
 238         WARN("unable to connect to host (%u)\n", ret);
 239         closesocket( conn->socket );
 240         free( conn );
 241         return ret;
 242     }
 243
 244     *ret_conn = conn;
 245     return ERROR_SUCCESS;
 246 }
 247
 248 void netconn_close( struct netconn *conn )
 249 {
 250     if (conn->secure)
 251     {
 252         free( conn->peek_msg_mem );
 253         free(conn->ssl_buf);
 254         free(conn->extra_buf);
 255         DeleteSecurityContext(&conn->ssl_ctx);
 256     }
 257     closesocket( conn->socket );
 258     release_host( conn->host );
 259     free(conn);
 260 }
 261
 262 DWORD netconn_secure_connect( struct netconn *conn, WCHAR *hostname, DWORD security_flags, CredHandle *cred_handle,
 263                               BOOL check_revocation )
 264 {
 265     SecBuffer out_buf = {0, SECBUFFER_TOKEN, NULL}, in_bufs[2] = {{0, SECBUFFER_TOKEN}, {0, SECBUFFER_EMPTY}};
 266     SecBufferDesc out_desc = {SECBUFFER_VERSION, 1, &out_buf}, in_desc = {SECBUFFER_VERSION, 2, in_bufs};
 267     BYTE *read_buf;
 268     SIZE_T read_buf_size = 2048;
 269     ULONG attrs = 0;
 270     CtxtHandle ctx;
 271     SSIZE_T size;
 272     const CERT_CONTEXT *cert;
 273     SECURITY_STATUS status;
 274     DWORD res = ERROR_SUCCESS;
 275
 276     const DWORD isc_req_flags = ISC_REQ_ALLOCATE_MEMORY|ISC_REQ_USE_SESSION_KEY|ISC_REQ_CONFIDENTIALITY
 277         |ISC_REQ_SEQUENCE_DETECT|ISC_REQ_REPLAY_DETECT|ISC_REQ_MANUAL_CRED_VALIDATION;
 278
 279     if (!(read_buf = malloc( read_buf_size ))) return ERROR_OUTOFMEMORY;
 280
 281     status = InitializeSecurityContextW(cred_handle, NULL, hostname, isc_req_flags, 0, 0, NULL, 0,
 282             &ctx, &out_desc, &attrs, NULL);
 283
 284     assert(status != SEC_E_OK);
 285
 286     while(status == SEC_I_CONTINUE_NEEDED || status == SEC_E_INCOMPLETE_MESSAGE) {
 287         if(out_buf.cbBuffer) {
 288             assert(status == SEC_I_CONTINUE_NEEDED);
 289
 290             TRACE("sending %u bytes\n", out_buf.cbBuffer);
 291
 292             size = sock_send(conn->socket, out_buf.pvBuffer, out_buf.cbBuffer, 0);
 293             if(size != out_buf.cbBuffer) {
 294                 ERR("send failed\n");
 295                 res = ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 296                 break;
 297             }
 298
 299             FreeContextBuffer(out_buf.pvBuffer);
 300             out_buf.pvBuffer = NULL;
 301             out_buf.cbBuffer = 0;
 302         }
 303
 304         if(status == SEC_I_CONTINUE_NEEDED) {
 305             assert(in_bufs[1].cbBuffer < read_buf_size);
 306
 307             memmove(read_buf, (BYTE*)in_bufs[0].pvBuffer+in_bufs[0].cbBuffer-in_bufs[1].cbBuffer, in_bufs[1].cbBuffer);
 308             in_bufs[0].cbBuffer = in_bufs[1].cbBuffer;
 309
 310             in_bufs[1].BufferType = SECBUFFER_EMPTY;
 311             in_bufs[1].cbBuffer = 0;
 312             in_bufs[1].pvBuffer = NULL;
 313         }
 314
 315         assert(in_bufs[0].BufferType == SECBUFFER_TOKEN);
 316         assert(in_bufs[1].BufferType == SECBUFFER_EMPTY);
 317
 318         if(in_bufs[0].cbBuffer + 1024 > read_buf_size) {
 319             BYTE *new_read_buf;
 320
 321             new_read_buf = realloc(read_buf, read_buf_size + 1024);
 322             if(!new_read_buf) {
 323                 status = E_OUTOFMEMORY;
 324                 break;
 325             }
 326
 327             in_bufs[0].pvBuffer = read_buf = new_read_buf;
 328             read_buf_size += 1024;
 329         }
 330
 331         size = sock_recv(conn->socket, read_buf+in_bufs[0].cbBuffer, read_buf_size-in_bufs[0].cbBuffer, 0);
 332         if(size < 1) {
 333             status = ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 334             break;
 335         }
 336
 337         TRACE("recv %lu bytes\n", size);
 338
 339         in_bufs[0].cbBuffer += size;
 340         in_bufs[0].pvBuffer = read_buf;
 341         status = InitializeSecurityContextW(cred_handle, &ctx, hostname,  isc_req_flags, 0, 0, &in_desc,
 342                 0, NULL, &out_desc, &attrs, NULL);
 343         TRACE("InitializeSecurityContext ret %08x\n", status);
 344
 345         if(status == SEC_E_OK) {
 346             if(in_bufs[1].BufferType == SECBUFFER_EXTRA)
 347                 FIXME("SECBUFFER_EXTRA not supported\n");
 348
 349             status = QueryContextAttributesW(&ctx, SECPKG_ATTR_STREAM_SIZES, &conn->ssl_sizes);
 350             if(status != SEC_E_OK) {
 351                 WARN("Could not get sizes\n");
 352                 break;
 353             }
 354
 355             status = QueryContextAttributesW(&ctx, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (void*)&cert);
 356             if(status == SEC_E_OK) {
 357                 res = netconn_verify_cert(cert, hostname, security_flags, check_revocation);
 358                 CertFreeCertificateContext(cert);
 359                 if(res != ERROR_SUCCESS) {
 360                     WARN("cert verify failed: %u\n", res);
 361                     break;
 362                 }
 363             }else {
 364                 WARN("Could not get cert\n");
 365                 break;
 366             }
 367
 368             conn->ssl_buf = malloc(conn->ssl_sizes.cbHeader + conn->ssl_sizes.cbMaximumMessage + conn->ssl_sizes.cbTrailer);
 369             if(!conn->ssl_buf) {
 370                 res = ERROR_OUTOFMEMORY;
 371                 break;
 372             }
 373         }
 374     }
 375
 376     free(read_buf);
 377
 378     if(status != SEC_E_OK || res != ERROR_SUCCESS) {
 379         WARN("Failed to initialize security context: %08x\n", status);
 380         free(conn->ssl_buf);
 381         conn->ssl_buf = NULL;
 382         DeleteSecurityContext(&ctx);
 383         return ERROR_WINHTTP_SECURE_CHANNEL_ERROR;
 384     }
 385
 386
 387     TRACE("established SSL connection\n");
 388     conn->secure = TRUE;
 389     conn->ssl_ctx = ctx;
 390     return ERROR_SUCCESS;
 391 }
 392
 393 static DWORD send_ssl_chunk( struct netconn *conn, const void *msg, size_t size )
 394 {
 395     SecBuffer bufs[4] = {
 396         {conn->ssl_sizes.cbHeader, SECBUFFER_STREAM_HEADER, conn->ssl_buf},
 397         {size,  SECBUFFER_DATA, conn->ssl_buf+conn->ssl_sizes.cbHeader},
 398         {conn->ssl_sizes.cbTrailer, SECBUFFER_STREAM_TRAILER, conn->ssl_buf+conn->ssl_sizes.cbHeader+size},
 399         {0, SECBUFFER_EMPTY, NULL}
 400     };
 401     SecBufferDesc buf_desc = {SECBUFFER_VERSION, ARRAY_SIZE(bufs), bufs};
 402     SECURITY_STATUS res;
 403
 404     memcpy( bufs[1].pvBuffer, msg, size );
 405     if ((res = EncryptMessage(&conn->ssl_ctx, 0, &buf_desc, 0)) != SEC_E_OK)
 406     {
 407         WARN("EncryptMessage failed: %08x\n", res);
 408         return res;
 409     }
 410
 411     if (sock_send( conn->socket, conn->ssl_buf, bufs[0].cbBuffer + bufs[1].cbBuffer + bufs[2].cbBuffer, 0 ) < 1)
 412     {
 413         WARN("send failed\n");
 414         return WSAGetLastError();
 415     }
 416
 417     return ERROR_SUCCESS;
 418 }
 419
 420 DWORD netconn_send( struct netconn *conn, const void *msg, size_t len, int *sent )
 421 {
 422     if (conn->secure)
 423     {
 424         const BYTE *ptr = msg;
 425         size_t chunk_size;
 426         DWORD res;
 427
 428         *sent = 0;
 429         while (len)
 430         {
 431             chunk_size = min( len, conn->ssl_sizes.cbMaximumMessage );
 432             if ((res = send_ssl_chunk( conn, ptr, chunk_size )))
 433                 return res;
 434
 435             *sent += chunk_size;
 436             ptr += chunk_size;
 437             len -= chunk_size;
 438         }
 439
 440         return ERROR_SUCCESS;
 441     }
 442
 443     if ((*sent = sock_send( conn->socket, msg, len, 0 )) < 0) return WSAGetLastError();
 444     return ERROR_SUCCESS;
 445 }
 446
 447 static DWORD read_ssl_chunk( struct netconn *conn, void *buf, SIZE_T buf_size, SIZE_T *ret_size, BOOL *eof )
 448 {
 449     const SIZE_T ssl_buf_size = conn->ssl_sizes.cbHeader+conn->ssl_sizes.cbMaximumMessage+conn->ssl_sizes.cbTrailer;
 450     SecBuffer bufs[4];
 451     SecBufferDesc buf_desc = {SECBUFFER_VERSION, ARRAY_SIZE(bufs), bufs};
 452     SSIZE_T size, buf_len;
 453     unsigned int i;
 454     SECURITY_STATUS res;
 455
 456     assert(conn->extra_len < ssl_buf_size);
 457
 458     if(conn->extra_len) {
 459         memcpy(conn->ssl_buf, conn->extra_buf, conn->extra_len);
 460         buf_len = conn->extra_len;
 461         conn->extra_len = 0;
 462         free(conn->extra_buf);
 463         conn->extra_buf = NULL;
 464     }else {
 465         if ((buf_len = sock_recv( conn->socket, conn->ssl_buf + conn->extra_len, ssl_buf_size - conn->extra_len, 0)) < 0)
 466             return WSAGetLastError();
 467
 468         if (!buf_len)
 469         {
 470             *eof = TRUE;
 471             return ERROR_SUCCESS;
 472         }
 473     }
 474
 475     *ret_size = 0;
 476     *eof = FALSE;
 477
 478     do {
 479         memset(bufs, 0, sizeof(bufs));
 480         bufs[0].BufferType = SECBUFFER_DATA;
 481         bufs[0].cbBuffer = buf_len;
 482         bufs[0].pvBuffer = conn->ssl_buf;
 483
 484         switch ((res = DecryptMessage( &conn->ssl_ctx, &buf_desc, 0, NULL )))
 485         {
 486         case SEC_E_OK:
 487             break;
 488
 489         case SEC_I_RENEGOTIATE:
 490             TRACE("renegotiate\n");
 491             return ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED;
 492
 493         case SEC_I_CONTEXT_EXPIRED:
 494             TRACE("context expired\n");
 495             *eof = TRUE;
 496             return ERROR_SUCCESS;
 497
 498         case SEC_E_INCOMPLETE_MESSAGE:
 499             assert(buf_len < ssl_buf_size);
 500
 501             if ((size = sock_recv( conn->socket, conn->ssl_buf + buf_len, ssl_buf_size - buf_len, 0 )) < 1)
 502                 return SEC_E_INCOMPLETE_MESSAGE;
 503
 504             buf_len += size;
 505             continue;
 506
 507         default:
 508             WARN("failed: %08x\n", res);
 509             return res;
 510         }
 511     } while (res != SEC_E_OK);
 512
 513     for(i = 0; i < ARRAY_SIZE(bufs); i++) {
 514         if(bufs[i].BufferType == SECBUFFER_DATA) {
 515             size = min(buf_size, bufs[i].cbBuffer);
 516             memcpy(buf, bufs[i].pvBuffer, size);
 517             if(size < bufs[i].cbBuffer) {
 518                 assert(!conn->peek_len);
 519                 conn->peek_msg_mem = conn->peek_msg = malloc(bufs[i].cbBuffer - size);
 520                 if(!conn->peek_msg)
 521                     return ERROR_OUTOFMEMORY;
 522                 conn->peek_len = bufs[i].cbBuffer-size;
 523                 memcpy(conn->peek_msg, (char*)bufs[i].pvBuffer+size, conn->peek_len);
 524             }
 525
 526             *ret_size = size;
 527         }
 528     }
 529
 530     for(i = 0; i < ARRAY_SIZE(bufs); i++) {
 531         if(bufs[i].BufferType == SECBUFFER_EXTRA) {
 532             conn->extra_buf = malloc(bufs[i].cbBuffer);
 533             if(!conn->extra_buf)
 534                 return ERROR_OUTOFMEMORY;
 535
 536             conn->extra_len = bufs[i].cbBuffer;
 537             memcpy(conn->extra_buf, bufs[i].pvBuffer, conn->extra_len);
 538         }
 539     }
 540
 541     return ERROR_SUCCESS;
 542 }
 543
 544 DWORD netconn_recv( struct netconn *conn, void *buf, size_t len, int flags, int *recvd )
 545 {
 546     *recvd = 0;
 547     if (!len) return ERROR_SUCCESS;
 548
 549     if (conn->secure)
 550     {
 551         SIZE_T size;
 552         DWORD res;
 553         BOOL eof;
 554
 555         if (conn->peek_msg)
 556         {
 557             *recvd = min( len, conn->peek_len );
 558             memcpy( buf, conn->peek_msg, *recvd );
 559             conn->peek_len -= *recvd;
 560             conn->peek_msg += *recvd;
 561
 562             if (conn->peek_len == 0)
 563             {
 564                 free( conn->peek_msg_mem );
 565                 conn->peek_msg_mem = NULL;
 566                 conn->peek_msg = NULL;
 567             }
 568             /* check if we have enough data from the peek buffer */
 569             if (!(flags & MSG_WAITALL) || *recvd == len) return ERROR_SUCCESS;
 570         }
 571         size = *recvd;
 572
 573         do
 574         {
 575             SIZE_T cread = 0;
 576             if ((res = read_ssl_chunk( conn, (BYTE *)buf + size, len - size, &cread, &eof )))
 577             {
 578                 WARN("read_ssl_chunk failed: %u\n", res);
 579                 if (!size) return res;
 580                 break;
 581             }
 582             if (eof)
 583             {
 584                 TRACE("EOF\n");
 585                 break;
 586             }
 587             size += cread;
 588
 589         } while (!size || ((flags & MSG_WAITALL) && size < len));
 590
 591         TRACE("received %ld bytes\n", size);
 592         *recvd = size;
 593         return ERROR_SUCCESS;
 594     }
 595
 596     if ((*recvd = sock_recv( conn->socket, buf, len, flags )) < 0) return WSAGetLastError();
 597     return ERROR_SUCCESS;
 598 }
 599
 600 ULONG netconn_query_data_available( struct netconn *conn )
 601 {
 602     return conn->secure ? conn->peek_len : 0;
 603 }
 604
 605 DWORD netconn_set_timeout( struct netconn *netconn, BOOL send, int value )
 606 {
 607     int opt = send ? SO_SNDTIMEO : SO_RCVTIMEO;
 608     if (setsockopt( netconn->socket, SOL_SOCKET, opt, (void *)&value, sizeof(value) ) == -1)
 609     {
 610         DWORD err = WSAGetLastError();
 611         WARN("setsockopt failed (%u)\n", err );
 612         return err;
 613     }
 614     return ERROR_SUCCESS;
 615 }
 616
 617 BOOL netconn_is_alive( struct netconn *netconn )
 618 {
 619     int len;
 620     char b;
 621     DWORD err;
 622
 623     set_blocking( netconn, FALSE );
 624     len = sock_recv( netconn->socket, &b, 1, MSG_PEEK );
 625     err = WSAGetLastError();
 626     set_blocking( netconn, TRUE );
 627
 628     return len == 1 || (len == -1 && err == WSAEWOULDBLOCK);
 629 }
 630
 631 static DWORD resolve_hostname( const WCHAR *name, INTERNET_PORT port, struct sockaddr_storage *sa )
 632 {
 633     ADDRINFOW *res, hints;
 634     int ret;
 635
 636     memset( &hints, 0, sizeof(hints) );
 637     /* Prefer IPv4 to IPv6 addresses, since some web servers do not listen on
 638      * their IPv6 addresses even though they have IPv6 addresses in the DNS.
 639      */
 640     hints.ai_family = AF_INET;
 641
 642     ret = GetAddrInfoW( name, NULL, &hints, &res );
 643     if (ret != 0)
 644     {
 645         TRACE("failed to get IPv4 address of %s, retrying with IPv6\n", debugstr_w(name));
 646         hints.ai_family = AF_INET6;
 647         ret = GetAddrInfoW( name, NULL, &hints, &res );
 648         if (ret != 0)
 649         {
 650             TRACE("failed to get address of %s\n", debugstr_w(name));
 651             return ERROR_WINHTTP_NAME_NOT_RESOLVED;
 652         }
 653     }
 654     memcpy( sa, res->ai_addr, res->ai_addrlen );
 655     switch (res->ai_family)
 656     {
 657     case AF_INET:
 658         ((struct sockaddr_in *)sa)->sin_port = htons( port );
 659         break;
 660     case AF_INET6:
 661         ((struct sockaddr_in6 *)sa)->sin6_port = htons( port );
 662         break;
 663     }
 664
 665     FreeAddrInfoW( res );
 666     return ERROR_SUCCESS;
 667 }
 668
 669 struct async_resolve
 670 {
 671     const WCHAR             *hostname;
 672     INTERNET_PORT            port;
 673     struct sockaddr_storage *addr;
 674     DWORD                    result;
 675     HANDLE                   done;
 676 };
 677
 678 static void CALLBACK resolve_proc( TP_CALLBACK_INSTANCE *instance, void *ctx )
 679 {
 680     struct async_resolve *async = ctx;
 681     async->result = resolve_hostname( async->hostname, async->port, async->addr );
 682     SetEvent( async->done );
 683 }
 684
 685 DWORD netconn_resolve( WCHAR *hostname, INTERNET_PORT port, struct sockaddr_storage *addr, int timeout )
 686 {
 687     DWORD ret;
 688
 689     if (!timeout) ret = resolve_hostname( hostname, port, addr );
 690     else
 691     {
 692         struct async_resolve async;
 693
 694         async.hostname = hostname;
 695         async.port     = port;
 696         async.addr     = addr;
 697         if (!(async.done = CreateEventW( NULL, FALSE, FALSE, NULL ))) return GetLastError();
 698         if (!TrySubmitThreadpoolCallback( resolve_proc, &async, NULL ))
 699         {
 700             CloseHandle( async.done );
 701             return GetLastError();
 702         }
 703         if (WaitForSingleObject( async.done, timeout ) != WAIT_OBJECT_0) ret = ERROR_WINHTTP_TIMEOUT;
 704         else ret = async.result;
 705         CloseHandle( async.done );
 706     }
 707
 708     return ret;
 709 }
 710
 711 const void *netconn_get_certificate( struct netconn *conn )
 712 {
 713     const CERT_CONTEXT *ret;
 714     SECURITY_STATUS res;
 715
 716     if (!conn->secure) return NULL;
 717     res = QueryContextAttributesW(&conn->ssl_ctx, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (void*)&ret);
 718     return res == SEC_E_OK ? ret : NULL;
 719 }
 720
 721 int netconn_get_cipher_strength( struct netconn *conn )
 722 {
 723     SecPkgContext_ConnectionInfo conn_info;
 724     SECURITY_STATUS res;
 725
 726     if (!conn->secure) return 0;
 727     res = QueryContextAttributesW(&conn->ssl_ctx, SECPKG_ATTR_CONNECTION_INFO, (void*)&conn_info);
 728     if(res != SEC_E_OK)
 729         WARN("QueryContextAttributesW failed: %08x\n", res);
 730     return res == SEC_E_OK ? conn_info.dwCipherStrength : 0;
 731 }