dlls/urlmon/session.c

   1 /*
   2  * Copyright 2005-2006 Jacek Caban 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 "urlmon_main.h"
  20 #include "winreg.h"
  21
  22 #include "wine/debug.h"
  23
  24 WINE_DEFAULT_DEBUG_CHANNEL(urlmon);
  25
  26 typedef struct name_space {
  27     LPWSTR protocol;
  28     IClassFactory *cf;
  29     CLSID clsid;
  30     BOOL urlmon;
  31
  32     struct name_space *next;
  33 } name_space;
  34
  35 typedef struct mime_filter {
  36     IClassFactory *cf;
  37     CLSID clsid;
  38     LPWSTR mime;
  39
  40     struct mime_filter *next;
  41 } mime_filter;
  42
  43 static name_space *name_space_list = NULL;
  44 static mime_filter *mime_filter_list = NULL;
  45
  46 static CRITICAL_SECTION session_cs;
  47 static CRITICAL_SECTION_DEBUG session_cs_dbg =
  48 {
  49     0, 0, &session_cs,
  50     { &session_cs_dbg.ProcessLocksList, &session_cs_dbg.ProcessLocksList },
  51       0, 0, { (DWORD_PTR)(__FILE__ ": session") }
  52 };
  53 static CRITICAL_SECTION session_cs = { &session_cs_dbg, -1, 0, 0, 0, 0 };
  54
  55 static const WCHAR internet_settings_keyW[] =
  56     {'S','O','F','T','W','A','R','E',
  57      '\\','M','i','c','r','o','s','o','f','t',
  58      '\\','W','i','n','d','o','w','s',
  59      '\\','C','u','r','r','e','n','t','V','e','r','s','i','o','n',
  60      '\\','I','n','t','e','r','n','e','t',' ','S','e','t','t','i','n','g','s',0};
  61
  62 static name_space *find_name_space(LPCWSTR protocol)
  63 {
  64     name_space *iter;
  65
  66     for(iter = name_space_list; iter; iter = iter->next) {
  67         if(!strcmpW(iter->protocol, protocol))
  68             return iter;
  69     }
  70
  71     return NULL;
  72 }
  73
  74 static HRESULT get_protocol_cf(LPCWSTR schema, DWORD schema_len, CLSID *pclsid, IClassFactory **ret)
  75 {
  76     WCHAR str_clsid[64];
  77     HKEY hkey = NULL;
  78     DWORD res, type, size;
  79     CLSID clsid;
  80     LPWSTR wszKey;
  81     HRESULT hres;
  82
  83     static const WCHAR wszProtocolsKey[] =
  84         {'P','R','O','T','O','C','O','L','S','\\','H','a','n','d','l','e','r','\\'};
  85     static const WCHAR wszCLSID[] = {'C','L','S','I','D',0};
  86
  87     wszKey = heap_alloc(sizeof(wszProtocolsKey)+(schema_len+1)*sizeof(WCHAR));
  88     memcpy(wszKey, wszProtocolsKey, sizeof(wszProtocolsKey));
  89     memcpy(wszKey + sizeof(wszProtocolsKey)/sizeof(WCHAR), schema, (schema_len+1)*sizeof(WCHAR));
  90
  91     res = RegOpenKeyW(HKEY_CLASSES_ROOT, wszKey, &hkey);
  92     heap_free(wszKey);
  93     if(res != ERROR_SUCCESS) {
  94         TRACE("Could not open protocol handler key\n");
  95         return MK_E_SYNTAX;
  96     }
  97
  98     size = sizeof(str_clsid);
  99     res = RegQueryValueExW(hkey, wszCLSID, NULL, &type, (LPBYTE)str_clsid, &size);
 100     RegCloseKey(hkey);
 101     if(res != ERROR_SUCCESS || type != REG_SZ) {
 102         WARN("Could not get protocol CLSID res=%d\n", res);
 103         return MK_E_SYNTAX;
 104     }
 105
 106     hres = CLSIDFromString(str_clsid, &clsid);
 107     if(FAILED(hres)) {
 108         WARN("CLSIDFromString failed: %08x\n", hres);
 109         return hres;
 110     }
 111
 112     if(pclsid)
 113         *pclsid = clsid;
 114
 115     if(!ret)
 116         return S_OK;
 117
 118     hres = CoGetClassObject(&clsid, CLSCTX_INPROC_SERVER, NULL, &IID_IClassFactory, (void**)ret);
 119     return SUCCEEDED(hres) ? S_OK : MK_E_SYNTAX;
 120 }
 121
 122 static HRESULT register_namespace(IClassFactory *cf, REFIID clsid, LPCWSTR protocol, BOOL urlmon_protocol)
 123 {
 124     name_space *new_name_space;
 125
 126     new_name_space = heap_alloc(sizeof(name_space));
 127
 128     if(!urlmon_protocol)
 129         IClassFactory_AddRef(cf);
 130     new_name_space->cf = cf;
 131     new_name_space->clsid = *clsid;
 132     new_name_space->urlmon = urlmon_protocol;
 133     new_name_space->protocol = heap_strdupW(protocol);
 134
 135     EnterCriticalSection(&session_cs);
 136
 137     new_name_space->next = name_space_list;
 138     name_space_list = new_name_space;
 139
 140     LeaveCriticalSection(&session_cs);
 141
 142     return S_OK;
 143 }
 144
 145 static HRESULT unregister_namespace(IClassFactory *cf, LPCWSTR protocol)
 146 {
 147     name_space *iter, *last = NULL;
 148
 149     EnterCriticalSection(&session_cs);
 150
 151     for(iter = name_space_list; iter; iter = iter->next) {
 152         if(iter->cf == cf && !strcmpW(iter->protocol, protocol))
 153             break;
 154         last = iter;
 155     }
 156
 157     if(iter) {
 158         if(last)
 159             last->next = iter->next;
 160         else
 161             name_space_list = iter->next;
 162     }
 163
 164     LeaveCriticalSection(&session_cs);
 165
 166     if(iter) {
 167         if(!iter->urlmon)
 168             IClassFactory_Release(iter->cf);
 169         heap_free(iter->protocol);
 170         heap_free(iter);
 171     }
 172
 173     return S_OK;
 174 }
 175
 176
 177 void register_urlmon_namespace(IClassFactory *cf, REFIID clsid, LPCWSTR protocol, BOOL do_register)
 178 {
 179     if(do_register)
 180         register_namespace(cf, clsid, protocol, TRUE);
 181     else
 182         unregister_namespace(cf, protocol);
 183 }
 184
 185 BOOL is_registered_protocol(LPCWSTR url)
 186 {
 187     DWORD schema_len;
 188     WCHAR schema[64];
 189     HRESULT hres;
 190
 191     hres = CoInternetParseUrl(url, PARSE_SCHEMA, 0, schema, sizeof(schema)/sizeof(schema[0]),
 192             &schema_len, 0);
 193     if(FAILED(hres))
 194         return FALSE;
 195
 196     return get_protocol_cf(schema, schema_len, NULL, NULL) == S_OK;
 197 }
 198
 199 IInternetProtocolInfo *get_protocol_info(LPCWSTR url)
 200 {
 201     IInternetProtocolInfo *ret = NULL;
 202     IClassFactory *cf;
 203     name_space *ns;
 204     WCHAR schema[64];
 205     DWORD schema_len;
 206     HRESULT hres;
 207
 208     hres = CoInternetParseUrl(url, PARSE_SCHEMA, 0, schema, sizeof(schema)/sizeof(schema[0]),
 209             &schema_len, 0);
 210     if(FAILED(hres) || !schema_len)
 211         return NULL;
 212
 213     EnterCriticalSection(&session_cs);
 214
 215     ns = find_name_space(schema);
 216     if(ns && !ns->urlmon) {
 217         hres = IClassFactory_QueryInterface(ns->cf, &IID_IInternetProtocolInfo, (void**)&ret);
 218         if(FAILED(hres))
 219             hres = IClassFactory_CreateInstance(ns->cf, NULL, &IID_IInternetProtocolInfo, (void**)&ret);
 220     }
 221
 222     LeaveCriticalSection(&session_cs);
 223
 224     if(ns && SUCCEEDED(hres))
 225         return ret;
 226
 227     hres = get_protocol_cf(schema, schema_len, NULL, &cf);
 228     if(FAILED(hres))
 229         return NULL;
 230
 231     hres = IClassFactory_QueryInterface(cf, &IID_IInternetProtocolInfo, (void**)&ret);
 232     if(FAILED(hres))
 233         IClassFactory_CreateInstance(cf, NULL, &IID_IInternetProtocolInfo, (void**)&ret);
 234     IClassFactory_Release(cf);
 235
 236     return ret;
 237 }
 238
 239 HRESULT get_protocol_handler(IUri *uri, CLSID *clsid, BOOL *urlmon_protocol, IClassFactory **ret)
 240 {
 241     name_space *ns;
 242     BSTR scheme;
 243     HRESULT hres;
 244
 245     *ret = NULL;
 246
 247     /* FIXME: Avoid GetSchemeName call for known schemes */
 248     hres = IUri_GetSchemeName(uri, &scheme);
 249     if(FAILED(hres))
 250         return hres;
 251
 252     EnterCriticalSection(&session_cs);
 253
 254     ns = find_name_space(scheme);
 255     if(ns) {
 256         *ret = ns->cf;
 257         IClassFactory_AddRef(*ret);
 258         if(clsid)
 259             *clsid = ns->clsid;
 260         if(urlmon_protocol)
 261             *urlmon_protocol = ns->urlmon;
 262     }
 263
 264     LeaveCriticalSection(&session_cs);
 265
 266     if(*ret) {
 267         hres = S_OK;
 268     }else {
 269         if(urlmon_protocol)
 270             *urlmon_protocol = FALSE;
 271         hres = get_protocol_cf(scheme, SysStringLen(scheme), clsid, ret);
 272     }
 273
 274     SysFreeString(scheme);
 275     return hres;
 276 }
 277
 278 IInternetProtocol *get_mime_filter(LPCWSTR mime)
 279 {
 280     IClassFactory *cf = NULL;
 281     IInternetProtocol *ret;
 282     mime_filter *iter;
 283     HRESULT hres;
 284
 285     EnterCriticalSection(&session_cs);
 286
 287     for(iter = mime_filter_list; iter; iter = iter->next) {
 288         if(!strcmpW(iter->mime, mime)) {
 289             cf = iter->cf;
 290             break;
 291         }
 292     }
 293
 294     LeaveCriticalSection(&session_cs);
 295
 296     if(!cf)
 297         return NULL;
 298
 299     hres = IClassFactory_CreateInstance(cf, NULL, &IID_IInternetProtocol, (void**)&ret);
 300     if(FAILED(hres)) {
 301         WARN("CreateInstance failed: %08x\n", hres);
 302         return NULL;
 303     }
 304
 305     return ret;
 306 }
 307
 308 static HRESULT WINAPI InternetSession_QueryInterface(IInternetSession *iface,
 309         REFIID riid, void **ppv)
 310 {
 311     TRACE("(%s %p)\n", debugstr_guid(riid), ppv);
 312
 313     if(IsEqualGUID(&IID_IUnknown, riid) || IsEqualGUID(&IID_IInternetSession, riid)) {
 314         *ppv = iface;
 315         IInternetSession_AddRef(iface);
 316         return S_OK;
 317     }
 318
 319     *ppv = NULL;
 320     return E_NOINTERFACE;
 321 }
 322
 323 static ULONG WINAPI InternetSession_AddRef(IInternetSession *iface)
 324 {
 325     TRACE("()\n");
 326     URLMON_LockModule();
 327     return 2;
 328 }
 329
 330 static ULONG WINAPI InternetSession_Release(IInternetSession *iface)
 331 {
 332     TRACE("()\n");
 333     URLMON_UnlockModule();
 334     return 1;
 335 }
 336
 337 static HRESULT WINAPI InternetSession_RegisterNameSpace(IInternetSession *iface,
 338         IClassFactory *pCF, REFCLSID rclsid, LPCWSTR pwzProtocol, ULONG cPatterns,
 339         const LPCWSTR *ppwzPatterns, DWORD dwReserved)
 340 {
 341     TRACE("(%p %s %s %d %p %d)\n", pCF, debugstr_guid(rclsid), debugstr_w(pwzProtocol),
 342           cPatterns, ppwzPatterns, dwReserved);
 343
 344     if(cPatterns || ppwzPatterns)
 345         FIXME("patterns not supported\n");
 346     if(dwReserved)
 347         WARN("dwReserved = %d\n", dwReserved);
 348
 349     if(!pCF || !pwzProtocol)
 350         return E_INVALIDARG;
 351
 352     return register_namespace(pCF, rclsid, pwzProtocol, FALSE);
 353 }
 354
 355 static HRESULT WINAPI InternetSession_UnregisterNameSpace(IInternetSession *iface,
 356         IClassFactory *pCF, LPCWSTR pszProtocol)
 357 {
 358     TRACE("(%p %s)\n", pCF, debugstr_w(pszProtocol));
 359
 360     if(!pCF || !pszProtocol)
 361         return E_INVALIDARG;
 362
 363     return unregister_namespace(pCF, pszProtocol);
 364 }
 365
 366 static HRESULT WINAPI InternetSession_RegisterMimeFilter(IInternetSession *iface,
 367         IClassFactory *pCF, REFCLSID rclsid, LPCWSTR pwzType)
 368 {
 369     mime_filter *filter;
 370
 371     TRACE("(%p %s %s)\n", pCF, debugstr_guid(rclsid), debugstr_w(pwzType));
 372
 373     filter = heap_alloc(sizeof(mime_filter));
 374
 375     IClassFactory_AddRef(pCF);
 376     filter->cf = pCF;
 377     filter->clsid = *rclsid;
 378     filter->mime = heap_strdupW(pwzType);
 379
 380     EnterCriticalSection(&session_cs);
 381
 382     filter->next = mime_filter_list;
 383     mime_filter_list = filter;
 384
 385     LeaveCriticalSection(&session_cs);
 386
 387     return S_OK;
 388 }
 389
 390 static HRESULT WINAPI InternetSession_UnregisterMimeFilter(IInternetSession *iface,
 391         IClassFactory *pCF, LPCWSTR pwzType)
 392 {
 393     mime_filter *iter, *prev = NULL;
 394
 395     TRACE("(%p %s)\n", pCF, debugstr_w(pwzType));
 396
 397     EnterCriticalSection(&session_cs);
 398
 399     for(iter = mime_filter_list; iter; iter = iter->next) {
 400         if(iter->cf == pCF && !strcmpW(iter->mime, pwzType))
 401             break;
 402         prev = iter;
 403     }
 404
 405     if(iter) {
 406         if(prev)
 407             prev->next = iter->next;
 408         else
 409             mime_filter_list = iter->next;
 410     }
 411
 412     LeaveCriticalSection(&session_cs);
 413
 414     if(iter) {
 415         IClassFactory_Release(iter->cf);
 416         heap_free(iter->mime);
 417         heap_free(iter);
 418     }
 419
 420     return S_OK;
 421 }
 422
 423 static HRESULT WINAPI InternetSession_CreateBinding(IInternetSession *iface,
 424         LPBC pBC, LPCWSTR szUrl, IUnknown *pUnkOuter, IUnknown **ppUnk,
 425         IInternetProtocol **ppOInetProt, DWORD dwOption)
 426 {
 427     BindProtocol *protocol;
 428     HRESULT hres;
 429
 430     TRACE("(%p %s %p %p %p %08x)\n", pBC, debugstr_w(szUrl), pUnkOuter, ppUnk,
 431             ppOInetProt, dwOption);
 432
 433     if(pBC || pUnkOuter || ppUnk || dwOption)
 434         FIXME("Unsupported arguments\n");
 435
 436     hres = create_binding_protocol(FALSE, &protocol);
 437     if(FAILED(hres))
 438         return hres;
 439
 440     *ppOInetProt = (IInternetProtocol*)&protocol->IInternetProtocolEx_iface;
 441     return S_OK;
 442 }
 443
 444 static HRESULT WINAPI InternetSession_SetSessionOption(IInternetSession *iface,
 445         DWORD dwOption, LPVOID pBuffer, DWORD dwBufferLength, DWORD dwReserved)
 446 {
 447     FIXME("(%08x %p %d %d)\n", dwOption, pBuffer, dwBufferLength, dwReserved);
 448     return E_NOTIMPL;
 449 }
 450
 451 static const IInternetSessionVtbl InternetSessionVtbl = {
 452     InternetSession_QueryInterface,
 453     InternetSession_AddRef,
 454     InternetSession_Release,
 455     InternetSession_RegisterNameSpace,
 456     InternetSession_UnregisterNameSpace,
 457     InternetSession_RegisterMimeFilter,
 458     InternetSession_UnregisterMimeFilter,
 459     InternetSession_CreateBinding,
 460     InternetSession_SetSessionOption
 461 };
 462
 463 static IInternetSession InternetSession = { &InternetSessionVtbl };
 464
 465 /***********************************************************************
 466  *           CoInternetGetSession (URLMON.@)
 467  *
 468  * Create a new internet session and return an IInternetSession interface
 469  * representing it.
 470  *
 471  * PARAMS
 472  *    dwSessionMode      [I] Mode for the internet session
 473  *    ppIInternetSession [O] Destination for creates IInternetSession object
 474  *    dwReserved         [I] Reserved, must be 0.
 475  *
 476  * RETURNS
 477  *    Success: S_OK. ppIInternetSession contains the IInternetSession interface.
 478  *    Failure: E_INVALIDARG, if any argument is invalid, or
 479  *             E_OUTOFMEMORY if memory allocation fails.
 480  */
 481 HRESULT WINAPI CoInternetGetSession(DWORD dwSessionMode, IInternetSession **ppIInternetSession,
 482         DWORD dwReserved)
 483 {
 484     TRACE("(%d %p %d)\n", dwSessionMode, ppIInternetSession, dwReserved);
 485
 486     if(dwSessionMode)
 487         ERR("dwSessionMode=%d\n", dwSessionMode);
 488     if(dwReserved)
 489         ERR("dwReserved=%d\n", dwReserved);
 490
 491     IInternetSession_AddRef(&InternetSession);
 492     *ppIInternetSession = &InternetSession;
 493     return S_OK;
 494 }
 495
 496 /**************************************************************************
 497  *                 UrlMkGetSessionOption (URLMON.@)
 498  */
 499 static BOOL get_url_encoding(HKEY root, DWORD *encoding)
 500 {
 501     DWORD size = sizeof(DWORD), res, type;
 502     HKEY hkey;
 503
 504     static const WCHAR wszUrlEncoding[] = {'U','r','l','E','n','c','o','d','i','n','g',0};
 505
 506     res = RegOpenKeyW(root, internet_settings_keyW, &hkey);
 507     if(res != ERROR_SUCCESS)
 508         return FALSE;
 509
 510     res = RegQueryValueExW(hkey, wszUrlEncoding, NULL, &type, (LPBYTE)encoding, &size);
 511     RegCloseKey(hkey);
 512
 513     return res == ERROR_SUCCESS;
 514 }
 515
 516 static LPWSTR user_agent;
 517
 518 static void ensure_useragent(void)
 519 {
 520     DWORD size = sizeof(DWORD), res, type;
 521     HKEY hkey;
 522
 523     static const WCHAR user_agentW[] = {'U','s','e','r',' ','A','g','e','n','t',0};
 524
 525     if(user_agent)
 526         return;
 527
 528     res = RegOpenKeyW(HKEY_CURRENT_USER, internet_settings_keyW, &hkey);
 529     if(res != ERROR_SUCCESS)
 530         return;
 531
 532     res = RegQueryValueExW(hkey, user_agentW, NULL, &type, NULL, &size);
 533     if(res == ERROR_SUCCESS && type == REG_SZ) {
 534         user_agent = heap_alloc(size);
 535         res = RegQueryValueExW(hkey, user_agentW, NULL, &type, (LPBYTE)user_agent, &size);
 536         if(res != ERROR_SUCCESS) {
 537             heap_free(user_agent);
 538             user_agent = NULL;
 539         }
 540     }else {
 541         WARN("Could not find User Agent value: %u\n", res);
 542     }
 543
 544     RegCloseKey(hkey);
 545 }
 546
 547 LPWSTR get_useragent(void)
 548 {
 549     LPWSTR ret;
 550
 551     ensure_useragent();
 552
 553     EnterCriticalSection(&session_cs);
 554     ret = heap_strdupW(user_agent);
 555     LeaveCriticalSection(&session_cs);
 556
 557     return ret;
 558 }
 559
 560 HRESULT WINAPI UrlMkGetSessionOption(DWORD dwOption, LPVOID pBuffer, DWORD dwBufferLength,
 561                                      DWORD* pdwBufferLength, DWORD dwReserved)
 562 {
 563     TRACE("(%x, %p, %d, %p)\n", dwOption, pBuffer, dwBufferLength, pdwBufferLength);
 564
 565     if(dwReserved)
 566         WARN("dwReserved = %d\n", dwReserved);
 567
 568     switch(dwOption) {
 569     case URLMON_OPTION_USERAGENT: {
 570         HRESULT hres = E_OUTOFMEMORY;
 571         DWORD size;
 572
 573         if(!pdwBufferLength)
 574             return E_INVALIDARG;
 575
 576         EnterCriticalSection(&session_cs);
 577
 578         ensure_useragent();
 579         if(user_agent) {
 580             size = WideCharToMultiByte(CP_ACP, 0, user_agent, -1, NULL, 0, NULL, NULL);
 581             *pdwBufferLength = size;
 582             if(size <= dwBufferLength) {
 583                 if(pBuffer)
 584                     WideCharToMultiByte(CP_ACP, 0, user_agent, -1, pBuffer, size, NULL, NULL);
 585                 else
 586                     hres = E_INVALIDARG;
 587             }
 588         }
 589
 590         LeaveCriticalSection(&session_cs);
 591
 592         /* Tests prove that we have to return E_OUTOFMEMORY on success. */
 593         return hres;
 594     }
 595     case URLMON_OPTION_URL_ENCODING: {
 596         DWORD encoding = 0;
 597
 598         if(!pBuffer || dwBufferLength < sizeof(DWORD) || !pdwBufferLength)
 599             return E_INVALIDARG;
 600
 601         if(!get_url_encoding(HKEY_CURRENT_USER, &encoding))
 602             get_url_encoding(HKEY_LOCAL_MACHINE, &encoding);
 603
 604         *pdwBufferLength = sizeof(DWORD);
 605         *(DWORD*)pBuffer = encoding ? URL_ENCODING_DISABLE_UTF8 : URL_ENCODING_ENABLE_UTF8;
 606         return S_OK;
 607     }
 608     default:
 609         FIXME("unsupported option %x\n", dwOption);
 610     }
 611
 612     return E_INVALIDARG;
 613 }
 614
 615 /**************************************************************************
 616  *                 UrlMkSetSessionOption (URLMON.@)
 617  */
 618 HRESULT WINAPI UrlMkSetSessionOption(DWORD dwOption, LPVOID pBuffer, DWORD dwBufferLength,
 619         DWORD Reserved)
 620 {
 621     TRACE("(%x %p %x)\n", dwOption, pBuffer, dwBufferLength);
 622
 623     switch(dwOption) {
 624     case URLMON_OPTION_USERAGENT: {
 625         LPWSTR new_user_agent;
 626         char *buf = pBuffer;
 627         DWORD len, size;
 628
 629         if(!pBuffer || !dwBufferLength)
 630             return E_INVALIDARG;
 631
 632         for(len=0; len<dwBufferLength && buf[len]; len++);
 633
 634         TRACE("Setting user agent %s\n", debugstr_an(buf, len));
 635
 636         size = MultiByteToWideChar(CP_ACP, 0, buf, len, NULL, 0);
 637         new_user_agent = heap_alloc((size+1)*sizeof(WCHAR));
 638         if(!new_user_agent)
 639             return E_OUTOFMEMORY;
 640         MultiByteToWideChar(CP_ACP, 0, buf, len, new_user_agent, size);
 641         new_user_agent[size] = 0;
 642
 643         EnterCriticalSection(&session_cs);
 644
 645         heap_free(user_agent);
 646         user_agent = new_user_agent;
 647
 648         LeaveCriticalSection(&session_cs);
 649         break;
 650     }
 651     default:
 652         FIXME("Unknown option %x\n", dwOption);
 653         return E_INVALIDARG;
 654     }
 655
 656     return S_OK;
 657 }
 658
 659 /**************************************************************************
 660  *                 ObtainUserAgentString (URLMON.@)
 661  */
 662 HRESULT WINAPI ObtainUserAgentString(DWORD dwOption, LPSTR pcszUAOut, DWORD *cbSize)
 663 {
 664     DWORD size;
 665     HRESULT hres = E_FAIL;
 666
 667     TRACE("(%d %p %p)\n", dwOption, pcszUAOut, cbSize);
 668
 669     if(!pcszUAOut || !cbSize)
 670         return E_INVALIDARG;
 671
 672     EnterCriticalSection(&session_cs);
 673
 674     ensure_useragent();
 675     if(user_agent) {
 676         size = WideCharToMultiByte(CP_ACP, 0, user_agent, -1, NULL, 0, NULL, NULL);
 677
 678         if(size <= *cbSize) {
 679             WideCharToMultiByte(CP_ACP, 0, user_agent, -1, pcszUAOut, *cbSize, NULL, NULL);
 680             hres = S_OK;
 681         }else {
 682             hres = E_OUTOFMEMORY;
 683         }
 684
 685         *cbSize = size;
 686     }
 687
 688     LeaveCriticalSection(&session_cs);
 689     return hres;
 690 }
 691
 692 void free_session(void)
 693 {
 694     heap_free(user_agent);
 695 }