dlls/winhttp/net.c

   1 /*
   2  * Copyright 2008 Hans Leidekker for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20 #include "wine/port.h"
  21
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #include <errno.h>
  25
  26 #include <sys/types.h>
  27 #ifdef HAVE_SYS_SOCKET_H
  28 # include <sys/socket.h>
  29 #endif
  30 #ifdef HAVE_SYS_IOCTL_H
  31 # include <sys/ioctl.h>
  32 #endif
  33 #ifdef HAVE_SYS_FILIO_H
  34 # include <sys/filio.h>
  35 #endif
  36 #ifdef HAVE_POLL_H
  37 # include <poll.h>
  38 #endif
  39 #ifdef HAVE_OPENSSL_SSL_H
  40 # include <openssl/ssl.h>
  41 #undef FAR
  42 #undef DSA
  43 #endif
  44
  45 #include "wine/debug.h"
  46 #include "wine/library.h"
  47
  48 #include "windef.h"
  49 #include "winbase.h"
  50 #include "winhttp.h"
  51 #include "wincrypt.h"
  52
  53 #include "winhttp_private.h"
  54
  55 /* to avoid conflicts with the Unix socket headers */
  56 #define USE_WS_PREFIX
  57 #include "winsock2.h"
  58
  59 WINE_DEFAULT_DEBUG_CHANNEL(winhttp);
  60
  61 #ifndef HAVE_GETADDRINFO
  62
  63 /* critical section to protect non-reentrant gethostbyname() */
  64 static CRITICAL_SECTION cs_gethostbyname;
  65 static CRITICAL_SECTION_DEBUG critsect_debug =
  66 {
  67     0, 0, &cs_gethostbyname,
  68     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  69       0, 0, { (DWORD_PTR)(__FILE__ ": cs_gethostbyname") }
  70 };
  71 static CRITICAL_SECTION cs_gethostbyname = { &critsect_debug, -1, 0, 0, 0, 0 };
  72
  73 #endif
  74
  75 #ifdef SONAME_LIBSSL
  76
  77 #include <openssl/err.h>
  78
  79 static void *libssl_handle;
  80 static void *libcrypto_handle;
  81
  82 static SSL_METHOD *method;
  83 static SSL_CTX *ctx;
  84
  85 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
  86
  87 MAKE_FUNCPTR( SSL_library_init );
  88 MAKE_FUNCPTR( SSL_load_error_strings );
  89 MAKE_FUNCPTR( SSLv23_method );
  90 MAKE_FUNCPTR( SSL_CTX_new );
  91 MAKE_FUNCPTR( SSL_new );
  92 MAKE_FUNCPTR( SSL_free );
  93 MAKE_FUNCPTR( SSL_set_fd );
  94 MAKE_FUNCPTR( SSL_connect );
  95 MAKE_FUNCPTR( SSL_shutdown );
  96 MAKE_FUNCPTR( SSL_write );
  97 MAKE_FUNCPTR( SSL_read );
  98 MAKE_FUNCPTR( SSL_get_verify_result );
  99 MAKE_FUNCPTR( SSL_get_peer_certificate );
 100 MAKE_FUNCPTR( SSL_CTX_set_default_verify_paths );
 101
 102 MAKE_FUNCPTR( BIO_new_fp );
 103 MAKE_FUNCPTR( ERR_get_error );
 104 MAKE_FUNCPTR( ERR_error_string );
 105 MAKE_FUNCPTR( i2d_X509 );
 106 #undef MAKE_FUNCPTR
 107
 108 #endif
 109
 110 /* translate a unix error code into a winsock error code */
 111 static int sock_get_error( int err )
 112 {
 113 #if !defined(__MINGW32__) && !defined (_MSC_VER)
 114     switch (err)
 115     {
 116         case EINTR:             return WSAEINTR;
 117         case EBADF:             return WSAEBADF;
 118         case EPERM:
 119         case EACCES:            return WSAEACCES;
 120         case EFAULT:            return WSAEFAULT;
 121         case EINVAL:            return WSAEINVAL;
 122         case EMFILE:            return WSAEMFILE;
 123         case EWOULDBLOCK:       return WSAEWOULDBLOCK;
 124         case EINPROGRESS:       return WSAEINPROGRESS;
 125         case EALREADY:          return WSAEALREADY;
 126         case ENOTSOCK:          return WSAENOTSOCK;
 127         case EDESTADDRREQ:      return WSAEDESTADDRREQ;
 128         case EMSGSIZE:          return WSAEMSGSIZE;
 129         case EPROTOTYPE:        return WSAEPROTOTYPE;
 130         case ENOPROTOOPT:       return WSAENOPROTOOPT;
 131         case EPROTONOSUPPORT:   return WSAEPROTONOSUPPORT;
 132         case ESOCKTNOSUPPORT:   return WSAESOCKTNOSUPPORT;
 133         case EOPNOTSUPP:        return WSAEOPNOTSUPP;
 134         case EPFNOSUPPORT:      return WSAEPFNOSUPPORT;
 135         case EAFNOSUPPORT:      return WSAEAFNOSUPPORT;
 136         case EADDRINUSE:        return WSAEADDRINUSE;
 137         case EADDRNOTAVAIL:     return WSAEADDRNOTAVAIL;
 138         case ENETDOWN:          return WSAENETDOWN;
 139         case ENETUNREACH:       return WSAENETUNREACH;
 140         case ENETRESET:         return WSAENETRESET;
 141         case ECONNABORTED:      return WSAECONNABORTED;
 142         case EPIPE:
 143         case ECONNRESET:        return WSAECONNRESET;
 144         case ENOBUFS:           return WSAENOBUFS;
 145         case EISCONN:           return WSAEISCONN;
 146         case ENOTCONN:          return WSAENOTCONN;
 147         case ESHUTDOWN:         return WSAESHUTDOWN;
 148         case ETOOMANYREFS:      return WSAETOOMANYREFS;
 149         case ETIMEDOUT:         return WSAETIMEDOUT;
 150         case ECONNREFUSED:      return WSAECONNREFUSED;
 151         case ELOOP:             return WSAELOOP;
 152         case ENAMETOOLONG:      return WSAENAMETOOLONG;
 153         case EHOSTDOWN:         return WSAEHOSTDOWN;
 154         case EHOSTUNREACH:      return WSAEHOSTUNREACH;
 155         case ENOTEMPTY:         return WSAENOTEMPTY;
 156 #ifdef EPROCLIM
 157         case EPROCLIM:          return WSAEPROCLIM;
 158 #endif
 159 #ifdef EUSERS
 160         case EUSERS:            return WSAEUSERS;
 161 #endif
 162 #ifdef EDQUOT
 163         case EDQUOT:            return WSAEDQUOT;
 164 #endif
 165 #ifdef ESTALE
 166         case ESTALE:            return WSAESTALE;
 167 #endif
 168 #ifdef EREMOTE
 169         case EREMOTE:           return WSAEREMOTE;
 170 #endif
 171     default: errno = err; perror( "sock_set_error" ); return WSAEFAULT;
 172     }
 173 #endif
 174     return err;
 175 }
 176
 177 BOOL netconn_init( netconn_t *conn, BOOL secure )
 178 {
 179     conn->socket = -1;
 180     if (!secure) return TRUE;
 181
 182 #if defined(SONAME_LIBSSL) && defined(SONAME_LIBCRYPTO)
 183     if (libssl_handle) return TRUE;
 184     if (!(libssl_handle = wine_dlopen( SONAME_LIBSSL, RTLD_NOW, NULL, 0 )))
 185     {
 186         ERR("Trying to use SSL but couldn't load %s. Expect trouble.\n", SONAME_LIBSSL);
 187         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR );
 188         return FALSE;
 189     }
 190     if (!(libcrypto_handle = wine_dlopen( SONAME_LIBCRYPTO, RTLD_NOW, NULL, 0 )))
 191     {
 192         ERR("Trying to use SSL but couldn't load %s. Expect trouble.\n", SONAME_LIBCRYPTO);
 193         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR );
 194         return FALSE;
 195     }
 196 #define LOAD_FUNCPTR(x) \
 197     if (!(p##x = wine_dlsym( libssl_handle, #x, NULL, 0 ))) \
 198     { \
 199         ERR("Failed to load symbol %s\n", #x); \
 200         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR ); \
 201         return FALSE; \
 202     }
 203     LOAD_FUNCPTR( SSL_library_init );
 204     LOAD_FUNCPTR( SSL_load_error_strings );
 205     LOAD_FUNCPTR( SSLv23_method );
 206     LOAD_FUNCPTR( SSL_CTX_new );
 207     LOAD_FUNCPTR( SSL_new );
 208     LOAD_FUNCPTR( SSL_free );
 209     LOAD_FUNCPTR( SSL_set_fd );
 210     LOAD_FUNCPTR( SSL_connect );
 211     LOAD_FUNCPTR( SSL_shutdown );
 212     LOAD_FUNCPTR( SSL_write );
 213     LOAD_FUNCPTR( SSL_read );
 214     LOAD_FUNCPTR( SSL_get_verify_result );
 215     LOAD_FUNCPTR( SSL_get_peer_certificate );
 216     LOAD_FUNCPTR( SSL_CTX_set_default_verify_paths );
 217 #undef LOAD_FUNCPTR
 218
 219 #define LOAD_FUNCPTR(x) \
 220     if (!(p##x = wine_dlsym( libcrypto_handle, #x, NULL, 0 ))) \
 221     { \
 222         ERR("Failed to load symbol %s\n", #x); \
 223         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR ); \
 224         return FALSE; \
 225     }
 226     LOAD_FUNCPTR( BIO_new_fp );
 227     LOAD_FUNCPTR( ERR_get_error );
 228     LOAD_FUNCPTR( ERR_error_string );
 229     LOAD_FUNCPTR( i2d_X509 );
 230 #undef LOAD_FUNCPTR
 231
 232     pSSL_library_init();
 233     pSSL_load_error_strings();
 234     pBIO_new_fp( stderr, BIO_NOCLOSE );
 235
 236     method = pSSLv23_method();
 237 #else
 238     WARN("SSL support not compiled in.\n");
 239     set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR );
 240     return FALSE;
 241 #endif
 242     return TRUE;
 243 }
 244
 245 BOOL netconn_connected( netconn_t *conn )
 246 {
 247     return (conn->socket != -1);
 248 }
 249
 250 BOOL netconn_create( netconn_t *conn, int domain, int type, int protocol )
 251 {
 252     if ((conn->socket = socket( domain, type, protocol )) == -1)
 253     {
 254         WARN("unable to create socket (%s)\n", strerror(errno));
 255         set_last_error( sock_get_error( errno ) );
 256         return FALSE;
 257     }
 258     return TRUE;
 259 }
 260
 261 BOOL netconn_close( netconn_t *conn )
 262 {
 263     int res;
 264
 265 #ifdef SONAME_LIBSSL
 266     if (conn->secure)
 267     {
 268         heap_free( conn->peek_msg_mem );
 269         conn->peek_msg_mem = NULL;
 270         conn->peek_msg = NULL;
 271         conn->peek_len = 0;
 272
 273         pSSL_shutdown( conn->ssl_conn );
 274         pSSL_free( conn->ssl_conn );
 275
 276         conn->ssl_conn = NULL;
 277         conn->secure = FALSE;
 278     }
 279 #endif
 280     res = closesocket( conn->socket );
 281     conn->socket = -1;
 282     if (res == -1)
 283     {
 284         set_last_error( sock_get_error( errno ) );
 285         return FALSE;
 286     }
 287     return TRUE;
 288 }
 289
 290 BOOL netconn_connect( netconn_t *conn, const struct sockaddr *sockaddr, unsigned int addr_len, int timeout )
 291 {
 292     BOOL ret = FALSE;
 293     int res = 0, state;
 294
 295     if (timeout > 0)
 296     {
 297         state = 1;
 298         ioctlsocket( conn->socket, FIONBIO, &state );
 299     }
 300     if (connect( conn->socket, sockaddr, addr_len ) < 0)
 301     {
 302         res = sock_get_error( errno );
 303         if (res == WSAEWOULDBLOCK || res == WSAEINPROGRESS)
 304         {
 305             struct pollfd pfd;
 306
 307             pfd.fd = conn->socket;
 308             pfd.events = POLLOUT;
 309             if (poll( &pfd, 1, timeout ) > 0)
 310                 ret = TRUE;
 311             else
 312                 res = sock_get_error( errno );
 313         }
 314     }
 315     else
 316         ret = TRUE;
 317     if (timeout > 0)
 318     {
 319         state = 0;
 320         ioctlsocket( conn->socket, FIONBIO, &state );
 321     }
 322     if (!ret)
 323     {
 324         WARN("unable to connect to host (%d)\n", res);
 325         set_last_error( res );
 326     }
 327     return ret;
 328 }
 329
 330 BOOL netconn_secure_connect( netconn_t *conn )
 331 {
 332 #ifdef SONAME_LIBSSL
 333     X509 *cert;
 334     long res;
 335
 336     ctx = pSSL_CTX_new( method );
 337     if (!pSSL_CTX_set_default_verify_paths( ctx ))
 338     {
 339         ERR("SSL_CTX_set_default_verify_paths failed: %s\n", pERR_error_string( pERR_get_error(), 0 ));
 340         set_last_error( ERROR_OUTOFMEMORY );
 341         return FALSE;
 342     }
 343     if (!(conn->ssl_conn = pSSL_new( ctx )))
 344     {
 345         ERR("SSL_new failed: %s\n", pERR_error_string( pERR_get_error(), 0 ));
 346         set_last_error( ERROR_OUTOFMEMORY );
 347         goto fail;
 348     }
 349     if (!pSSL_set_fd( conn->ssl_conn, conn->socket ))
 350     {
 351         ERR("SSL_set_fd failed: %s\n", pERR_error_string( pERR_get_error(), 0 ));
 352         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR );
 353         goto fail;
 354     }
 355     if (pSSL_connect( conn->ssl_conn ) <= 0)
 356     {
 357         ERR("SSL_connect failed: %s\n", pERR_error_string( pERR_get_error(), 0 ));
 358         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR );
 359         goto fail;
 360     }
 361     if (!(cert = pSSL_get_peer_certificate( conn->ssl_conn )))
 362     {
 363         ERR("No certificate for server: %s\n", pERR_error_string( pERR_get_error(), 0 ));
 364         set_last_error( ERROR_WINHTTP_SECURE_CHANNEL_ERROR );
 365         goto fail;
 366     }
 367     if ((res = pSSL_get_verify_result( conn->ssl_conn )) != X509_V_OK)
 368     {
 369         /* FIXME: we should set an error and return, but we only print an error at the moment */
 370         ERR("couldn't verify server certificate (%ld)\n", res);
 371     }
 372     TRACE("established SSL connection\n");
 373     conn->secure = TRUE;
 374     return TRUE;
 375
 376 fail:
 377     if (conn->ssl_conn)
 378     {
 379         pSSL_shutdown( conn->ssl_conn );
 380         pSSL_free( conn->ssl_conn );
 381         conn->ssl_conn = NULL;
 382     }
 383 #endif
 384     return FALSE;
 385 }
 386
 387 BOOL netconn_send( netconn_t *conn, const void *msg, size_t len, int flags, int *sent )
 388 {
 389     if (!netconn_connected( conn )) return FALSE;
 390     if (conn->secure)
 391     {
 392 #ifdef SONAME_LIBSSL
 393         if (flags) FIXME("SSL_write doesn't support any flags (%08x)\n", flags);
 394         *sent = pSSL_write( conn->ssl_conn, msg, len );
 395         if (*sent < 1 && len) return FALSE;
 396         return TRUE;
 397 #else
 398         return FALSE;
 399 #endif
 400     }
 401     if ((*sent = send( conn->socket, msg, len, flags )) == -1)
 402     {
 403         set_last_error( sock_get_error( errno ) );
 404         return FALSE;
 405     }
 406     return TRUE;
 407 }
 408
 409 BOOL netconn_recv( netconn_t *conn, void *buf, size_t len, int flags, int *recvd )
 410 {
 411     *recvd = 0;
 412     if (!netconn_connected( conn )) return FALSE;
 413     if (!len) return TRUE;
 414
 415     if (conn->secure)
 416     {
 417 #ifdef SONAME_LIBSSL
 418         if (flags & ~(MSG_PEEK | MSG_WAITALL))
 419             FIXME("SSL_read does not support the following flags: %08x\n", flags);
 420
 421         /* this ugly hack is all for MSG_PEEK */
 422         if (flags & MSG_PEEK && !conn->peek_msg)
 423         {
 424             if (!(conn->peek_msg = conn->peek_msg_mem = heap_alloc( len + 1 ))) return FALSE;
 425         }
 426         else if (flags & MSG_PEEK && conn->peek_msg)
 427         {
 428             if (len < conn->peek_len) FIXME("buffer isn't big enough, should we wrap?\n");
 429             *recvd = min( len, conn->peek_len );
 430             memcpy( buf, conn->peek_msg, *recvd );
 431             return TRUE;
 432         }
 433         else if (conn->peek_msg)
 434         {
 435             *recvd = min( len, conn->peek_len );
 436             memcpy( buf, conn->peek_msg, *recvd );
 437             conn->peek_len -= *recvd;
 438             conn->peek_msg += *recvd;
 439
 440             if (conn->peek_len == 0)
 441             {
 442                 heap_free( conn->peek_msg_mem );
 443                 conn->peek_msg_mem = NULL;
 444                 conn->peek_msg = NULL;
 445             }
 446             /* check if we have enough data from the peek buffer */
 447             if (!(flags & MSG_WAITALL) || (*recvd == len)) return TRUE;
 448         }
 449         *recvd += pSSL_read( conn->ssl_conn, (char *)buf + *recvd, len - *recvd );
 450         if (flags & MSG_PEEK) /* must copy into buffer */
 451         {
 452             conn->peek_len = *recvd;
 453             if (!*recvd)
 454             {
 455                 heap_free( conn->peek_msg_mem );
 456                 conn->peek_msg_mem = NULL;
 457                 conn->peek_msg = NULL;
 458             }
 459             else memcpy( conn->peek_msg, buf, *recvd );
 460         }
 461         if (*recvd < 1 && len) return FALSE;
 462         return TRUE;
 463 #else
 464         return FALSE;
 465 #endif
 466     }
 467     if ((*recvd = recv( conn->socket, buf, len, flags )) == -1)
 468     {
 469         set_last_error( sock_get_error( errno ) );
 470         return FALSE;
 471     }
 472     return TRUE;
 473 }
 474
 475 BOOL netconn_query_data_available( netconn_t *conn, DWORD *available )
 476 {
 477 #ifdef FIONREAD
 478     int ret, unread;
 479 #endif
 480     *available = 0;
 481     if (!netconn_connected( conn )) return FALSE;
 482
 483     if (conn->secure)
 484     {
 485 #ifdef SONAME_LIBSSL
 486         if (conn->peek_msg) *available = conn->peek_len;
 487 #endif
 488         return TRUE;
 489     }
 490 #ifdef FIONREAD
 491     if (!(ret = ioctlsocket( conn->socket, FIONREAD, &unread ))) *available = unread;
 492 #endif
 493     return TRUE;
 494 }
 495
 496 BOOL netconn_get_next_line( netconn_t *conn, char *buffer, DWORD *buflen )
 497 {
 498     struct pollfd pfd;
 499     BOOL ret = FALSE;
 500     DWORD recvd = 0;
 501
 502     if (!netconn_connected( conn )) return FALSE;
 503
 504     if (conn->secure)
 505     {
 506 #ifdef SONAME_LIBSSL
 507         while (recvd < *buflen)
 508         {
 509             int dummy;
 510             if (!netconn_recv( conn, &buffer[recvd], 1, 0, &dummy ))
 511             {
 512                 set_last_error( ERROR_CONNECTION_ABORTED );
 513                 break;
 514             }
 515             if (buffer[recvd] == '\n')
 516             {
 517                 ret = TRUE;
 518                 break;
 519             }
 520             if (buffer[recvd] != '\r') recvd++;
 521         }
 522         if (ret)
 523         {
 524             buffer[recvd++] = 0;
 525             *buflen = recvd;
 526             TRACE("received line %s\n", debugstr_a(buffer));
 527         }
 528         return ret;
 529 #else
 530         return FALSE;
 531 #endif
 532     }
 533
 534     pfd.fd = conn->socket;
 535     pfd.events = POLLIN;
 536     while (recvd < *buflen)
 537     {
 538         int timeout, res;
 539         struct timeval tv;
 540         socklen_t len = sizeof(tv);
 541
 542         if ((res = getsockopt( conn->socket, SOL_SOCKET, SO_RCVTIMEO, (void*)&tv, &len ) != -1))
 543             timeout = tv.tv_sec * 1000 + tv.tv_usec / 1000;
 544         else
 545             timeout = -1;
 546         if (poll( &pfd, 1, timeout ) > 0)
 547         {
 548             if ((res = recv( conn->socket, &buffer[recvd], 1, 0 )) <= 0)
 549             {
 550                 if (res == -1) set_last_error( sock_get_error( errno ) );
 551                 break;
 552             }
 553             if (buffer[recvd] == '\n')
 554             {
 555                 ret = TRUE;
 556                 break;
 557             }
 558             if (buffer[recvd] != '\r') recvd++;
 559         }
 560         else
 561         {
 562             set_last_error( ERROR_WINHTTP_TIMEOUT );
 563             break;
 564         }
 565     }
 566     if (ret)
 567     {
 568         buffer[recvd++] = 0;
 569         *buflen = recvd;
 570         TRACE("received line %s\n", debugstr_a(buffer));
 571     }
 572     return ret;
 573 }
 574
 575 DWORD netconn_set_timeout( netconn_t *netconn, BOOL send, int value )
 576 {
 577     int res;
 578     struct timeval tv;
 579
 580     /* value is in milliseconds, convert to struct timeval */
 581     tv.tv_sec = value / 1000;
 582     tv.tv_usec = (value % 1000) * 1000;
 583
 584     if ((res = setsockopt( netconn->socket, SOL_SOCKET, send ? SO_SNDTIMEO : SO_RCVTIMEO, (void*)&tv, sizeof(tv) ) == -1))
 585     {
 586         WARN("setsockopt failed (%s)\n", strerror( errno ));
 587         return sock_get_error( errno );
 588     }
 589     return ERROR_SUCCESS;
 590 }
 591
 592 BOOL netconn_resolve( WCHAR *hostnameW, INTERNET_PORT port, struct sockaddr *sa, socklen_t *sa_len )
 593 {
 594     char *hostname;
 595 #ifdef HAVE_GETADDRINFO
 596     struct addrinfo *res, hints;
 597     int ret;
 598 #else
 599     struct hostent *he;
 600     struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 601 #endif
 602
 603     if (!(hostname = strdupWA( hostnameW ))) return FALSE;
 604
 605 #ifdef HAVE_GETADDRINFO
 606     memset( &hints, 0, sizeof(struct addrinfo) );
 607     /* Prefer IPv4 to IPv6 addresses, since some web servers do not listen on
 608      * their IPv6 addresses even though they have IPv6 addresses in the DNS.
 609      */
 610     hints.ai_family = AF_INET;
 611
 612     ret = getaddrinfo( hostname, NULL, &hints, &res );
 613     if (ret != 0)
 614     {
 615         TRACE("failed to get IPv4 address of %s (%s), retrying with IPv6\n", debugstr_w(hostnameW), gai_strerror(ret));
 616         hints.ai_family = AF_INET6;
 617         ret = getaddrinfo( hostname, NULL, &hints, &res );
 618         if (ret != 0)
 619         {
 620             TRACE("failed to get address of %s (%s)\n", debugstr_w(hostnameW), gai_strerror(ret));
 621             heap_free( hostname );
 622             return FALSE;
 623         }
 624     }
 625     heap_free( hostname );
 626     if (*sa_len < res->ai_addrlen)
 627     {
 628         WARN("address too small\n");
 629         freeaddrinfo( res );
 630         return FALSE;
 631     }
 632     *sa_len = res->ai_addrlen;
 633     memcpy( sa, res->ai_addr, res->ai_addrlen );
 634     /* Copy port */
 635     switch (res->ai_family)
 636     {
 637     case AF_INET:
 638         ((struct sockaddr_in *)sa)->sin_port = htons( port );
 639         break;
 640     case AF_INET6:
 641         ((struct sockaddr_in6 *)sa)->sin6_port = htons( port );
 642         break;
 643     }
 644
 645     freeaddrinfo( res );
 646     return TRUE;
 647 #else
 648     EnterCriticalSection( &cs_gethostbyname );
 649
 650     he = gethostbyname( hostname );
 651     heap_free( hostname );
 652     if (!he)
 653     {
 654         TRACE("failed to get address of %s (%d)\n", debugstr_w(hostnameW), h_errno);
 655         LeaveCriticalSection( &cs_gethostbyname );
 656         return FALSE;
 657     }
 658     if (*sa_len < sizeof(struct sockaddr_in))
 659     {
 660         WARN("address too small\n");
 661         LeaveCriticalSection( &cs_gethostbyname );
 662         return FALSE;
 663     }
 664     *sa_len = sizeof(struct sockaddr_in);
 665     memset( sa, 0, sizeof(struct sockaddr_in) );
 666     memcpy( &sin->sin_addr, he->h_addr, he->h_length );
 667     sin->sin_family = he->h_addrtype;
 668     sin->sin_port = htons( port );
 669
 670     LeaveCriticalSection( &cs_gethostbyname );
 671     return TRUE;
 672 #endif
 673 }
 674
 675 const void *netconn_get_certificate( netconn_t *conn )
 676 {
 677 #ifdef SONAME_LIBSSL
 678     X509 *cert;
 679     unsigned char *buffer, *p;
 680     int len;
 681     BOOL malloc = FALSE;
 682     const CERT_CONTEXT *ret;
 683
 684     if (!conn->secure) return NULL;
 685
 686     if (!(cert = pSSL_get_peer_certificate( conn->ssl_conn ))) return NULL;
 687     p = NULL;
 688     if ((len = pi2d_X509( cert, &p )) < 0) return NULL;
 689     /*
 690      * SSL 0.9.7 and above malloc the buffer if it is null.
 691      * however earlier version do not and so we would need to alloc the buffer.
 692      *
 693      * see the i2d_X509 man page for more details.
 694      */
 695     if (!p)
 696     {
 697         if (!(buffer = heap_alloc( len ))) return NULL;
 698         p = buffer;
 699         len = pi2d_X509( cert, &p );
 700     }
 701     else
 702     {
 703         buffer = p;
 704         malloc = TRUE;
 705     }
 706
 707     ret = CertCreateCertificateContext( X509_ASN_ENCODING, buffer, len );
 708
 709     if (malloc) free( buffer );
 710     else heap_free( buffer );
 711
 712     return ret;
 713 #else
 714     return NULL;
 715 #endif
 716 }