dlls/winhttp/url.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 <stdarg.h>
  21
  22 #include "wine/debug.h"
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "winreg.h"
  27 #include "winhttp.h"
  28 #include "shlwapi.h"
  29
  30 #include "winhttp_private.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(winhttp);
  33
  34 static const WCHAR scheme_http[] = {'h','t','t','p',0};
  35 static const WCHAR scheme_https[] = {'h','t','t','p','s',0};
  36
  37 static BOOL set_component( WCHAR **str, DWORD *str_len, WCHAR *value, DWORD len, DWORD flags )
  38 {
  39     if (*str && !*str_len)
  40     {
  41         set_last_error( ERROR_INVALID_PARAMETER );
  42         return FALSE;
  43     }
  44     if (!*str_len) return TRUE;
  45     if (!*str)
  46     {
  47         if (len && *str_len && (flags & (ICU_DECODE|ICU_ESCAPE)))
  48         {
  49             set_last_error( ERROR_INVALID_PARAMETER );
  50             return FALSE;
  51         }
  52         *str = value;
  53         *str_len = len;
  54     }
  55     else
  56     {
  57         if (len > (*str_len) - 1)
  58         {
  59             *str_len = len + 1;
  60             set_last_error( ERROR_INSUFFICIENT_BUFFER );
  61             return FALSE;
  62         }
  63         memcpy( *str, value, len * sizeof(WCHAR) );
  64         (*str)[len] = 0;
  65         *str_len = len;
  66     }
  67     return TRUE;
  68 }
  69
  70 static WCHAR *decode_url( LPCWSTR url, DWORD *len )
  71 {
  72     const WCHAR *p = url;
  73     WCHAR hex[3], *q, *ret;
  74
  75     if (!(ret = heap_alloc( *len * sizeof(WCHAR) ))) return NULL;
  76     q = ret;
  77     while (*len > 0)
  78     {
  79         if (p[0] == '%' && isxdigitW( p[1] ) && isxdigitW( p[2] ))
  80         {
  81             hex[0] = p[1];
  82             hex[1] = p[2];
  83             hex[2] = 0;
  84             *q++ = strtolW( hex, NULL, 16 );
  85             p += 3;
  86             *len -= 3;
  87         }
  88         else
  89         {
  90             *q++ = *p++;
  91             *len -= 1;
  92         }
  93     }
  94     *len = q - ret;
  95     return ret;
  96 }
  97
  98 static BOOL need_escape( WCHAR c )
  99 {
 100     if (isalnumW( c )) return FALSE;
 101
 102     if (c <= 31 || c >= 127) return TRUE;
 103     else
 104     {
 105         switch (c)
 106         {
 107         case ' ':
 108         case '"':
 109         case '#':
 110         case '%':
 111         case '<':
 112         case '>':
 113         case ']':
 114         case '\\':
 115         case '[':
 116         case '^':
 117         case '`':
 118         case '{':
 119         case '|':
 120         case '}':
 121         case '~':
 122             return TRUE;
 123         default:
 124             return FALSE;
 125         }
 126     }
 127 }
 128
 129 static DWORD copy_escape( WCHAR *dst, const WCHAR *src, DWORD len )
 130 {
 131     static const WCHAR hex[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
 132     DWORD ret = len;
 133     unsigned int i;
 134     WCHAR *p = dst;
 135
 136     for (i = 0; i < len; i++, p++)
 137     {
 138         if (need_escape( src[i] ))
 139         {
 140             p[0] = '%';
 141             p[1] = hex[(src[i] >> 4) & 0xf];
 142             p[2] = hex[src[i] & 0xf];
 143             ret += 2;
 144             p += 2;
 145         }
 146         else *p = src[i];
 147     }
 148     dst[ret] = 0;
 149     return ret;
 150 }
 151
 152 static WCHAR *escape_url( LPCWSTR url, DWORD *len )
 153 {
 154     WCHAR *ret;
 155     const WCHAR *p, *q;
 156
 157     if ((p = q = strrchrW( url, '/' )))
 158     {
 159         while (*q)
 160         {
 161             if (need_escape( *q )) *len += 2;
 162             q++;
 163         }
 164     }
 165     if (!(ret = heap_alloc( (*len + 1) * sizeof(WCHAR) ))) return NULL;
 166     if (!p) strcpyW( ret, url );
 167     else
 168     {
 169         memcpy( ret, url, (p - url) * sizeof(WCHAR) );
 170         copy_escape( ret + (p - url), p, q - p );
 171     }
 172     return ret;
 173 }
 174
 175 /***********************************************************************
 176  *          WinHttpCrackUrl (winhttp.@)
 177  */
 178 BOOL WINAPI WinHttpCrackUrl( LPCWSTR url, DWORD len, DWORD flags, LPURL_COMPONENTSW uc )
 179 {
 180     BOOL ret = FALSE;
 181     WCHAR *p, *q, *r, *url_decoded = NULL, *url_escaped = NULL;
 182     INTERNET_SCHEME scheme = 0;
 183
 184     TRACE("%s, %d, %x, %p\n", debugstr_w(url), len, flags, uc);
 185
 186     if (!url || !uc || uc->dwStructSize != sizeof(URL_COMPONENTS))
 187     {
 188         set_last_error( ERROR_INVALID_PARAMETER );
 189         return FALSE;
 190     }
 191     if (!len) len = strlenW( url );
 192
 193     if (flags & ICU_ESCAPE)
 194     {
 195         if (!(url_escaped = escape_url( url, &len )))
 196         {
 197             set_last_error( ERROR_OUTOFMEMORY );
 198             return FALSE;
 199         }
 200         url = url_escaped;
 201     }
 202     else if (flags & ICU_DECODE)
 203     {
 204         if (!(url_decoded = decode_url( url, &len )))
 205         {
 206             set_last_error( ERROR_OUTOFMEMORY );
 207             return FALSE;
 208         }
 209         url = url_decoded;
 210     }
 211     if (!(p = strchrW( url, ':' )))
 212     {
 213         set_last_error( ERROR_WINHTTP_UNRECOGNIZED_SCHEME );
 214         return FALSE;
 215     }
 216     if (p - url == 4 && !strncmpiW( url, scheme_http, 4 )) scheme = INTERNET_SCHEME_HTTP;
 217     else if (p - url == 5 && !strncmpiW( url, scheme_https, 5 )) scheme = INTERNET_SCHEME_HTTPS;
 218     else
 219     {
 220         set_last_error( ERROR_WINHTTP_UNRECOGNIZED_SCHEME );
 221         goto exit;
 222     }
 223     if (!(set_component( &uc->lpszScheme, &uc->dwSchemeLength, (WCHAR *)url, p - url, flags ))) goto exit;
 224
 225     p++; /* skip ':' */
 226     if (!p[0] || p[0] != '/' || p[1] != '/') goto exit;
 227     p += 2;
 228
 229     if (!p[0]) goto exit;
 230     if ((q = memchrW( p, '@', len - (p - url) )) && !(memchrW( p, '/', q - p )))
 231     {
 232         if ((r = memchrW( p, ':', q - p )))
 233         {
 234             if (!(set_component( &uc->lpszUserName, &uc->dwUserNameLength, p, r - p, flags ))) goto exit;
 235             r++;
 236             if (!(set_component( &uc->lpszPassword, &uc->dwPasswordLength, r, q - r, flags ))) goto exit;
 237         }
 238         else
 239         {
 240             if (!(set_component( &uc->lpszUserName, &uc->dwUserNameLength, p, q - p, flags ))) goto exit;
 241             if (!(set_component( &uc->lpszPassword, &uc->dwPasswordLength, NULL, 0, flags ))) goto exit;
 242         }
 243         p = q + 1;
 244     }
 245     else
 246     {
 247         if (!(set_component( &uc->lpszUserName, &uc->dwUserNameLength, NULL, 0, flags ))) goto exit;
 248         if (!(set_component( &uc->lpszPassword, &uc->dwPasswordLength, NULL, 0, flags ))) goto exit;
 249     }
 250     if ((q = memchrW( p, '/', len - (p - url) )))
 251     {
 252         if ((r = memchrW( p, ':', q - p )))
 253         {
 254             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, r - p, flags ))) goto exit;
 255             r++;
 256             uc->nPort = atoiW( r );
 257         }
 258         else
 259         {
 260             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, q - p, flags ))) goto exit;
 261             if (scheme == INTERNET_SCHEME_HTTP) uc->nPort = INTERNET_DEFAULT_HTTP_PORT;
 262             if (scheme == INTERNET_SCHEME_HTTPS) uc->nPort = INTERNET_DEFAULT_HTTPS_PORT;
 263         }
 264
 265         if ((r = memchrW( q, '?', len - (q - url) )))
 266         {
 267             if (!(set_component( &uc->lpszUrlPath, &uc->dwUrlPathLength, q, r - q, flags ))) goto exit;
 268             if (!(set_component( &uc->lpszExtraInfo, &uc->dwExtraInfoLength, r, len - (r - url), flags ))) goto exit;
 269         }
 270         else
 271         {
 272             if (!(set_component( &uc->lpszUrlPath, &uc->dwUrlPathLength, q, len - (q - url), flags ))) goto exit;
 273             if (!(set_component( &uc->lpszExtraInfo, &uc->dwExtraInfoLength, (WCHAR *)url + len, 0, flags ))) goto exit;
 274         }
 275     }
 276     else
 277     {
 278         if ((r = memchrW( p, ':', len - (p - url) )))
 279         {
 280             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, r - p, flags ))) goto exit;
 281             r++;
 282             uc->nPort = atoiW( r );
 283         }
 284         else
 285         {
 286             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, len - (p - url), flags ))) goto exit;
 287             if (scheme == INTERNET_SCHEME_HTTP) uc->nPort = INTERNET_DEFAULT_HTTP_PORT;
 288             if (scheme == INTERNET_SCHEME_HTTPS) uc->nPort = INTERNET_DEFAULT_HTTPS_PORT;
 289         }
 290         if (!(set_component( &uc->lpszUrlPath, &uc->dwUrlPathLength, (WCHAR *)url + len, 0, flags ))) goto exit;
 291         if (!(set_component( &uc->lpszExtraInfo, &uc->dwExtraInfoLength, (WCHAR *)url + len, 0, flags ))) goto exit;
 292     }
 293
 294     ret = TRUE;
 295
 296     TRACE("scheme(%s) host(%s) port(%d) path(%s) extra(%s)\n",
 297           debugstr_wn( uc->lpszScheme, uc->dwSchemeLength ),
 298           debugstr_wn( uc->lpszHostName, uc->dwHostNameLength ),
 299           uc->nPort,
 300           debugstr_wn( uc->lpszUrlPath, uc->dwUrlPathLength ),
 301           debugstr_wn( uc->lpszExtraInfo, uc->dwExtraInfoLength ));
 302
 303 exit:
 304     if (ret) uc->nScheme = scheme;
 305     heap_free( url_decoded );
 306     heap_free( url_escaped );
 307     return ret;
 308 }
 309
 310 static INTERNET_SCHEME get_scheme( const WCHAR *scheme, DWORD len )
 311 {
 312     if (!strncmpW( scheme, scheme_http, len )) return INTERNET_SCHEME_HTTP;
 313     if (!strncmpW( scheme, scheme_https, len )) return INTERNET_SCHEME_HTTPS;
 314     return 0;
 315 }
 316
 317 static const WCHAR *get_scheme_string( INTERNET_SCHEME scheme )
 318 {
 319     if (scheme == INTERNET_SCHEME_HTTP) return scheme_http;
 320     if (scheme == INTERNET_SCHEME_HTTPS) return scheme_https;
 321     return NULL;
 322 }
 323
 324 static BOOL uses_default_port( INTERNET_SCHEME scheme, INTERNET_PORT port )
 325 {
 326     if ((scheme == INTERNET_SCHEME_HTTP) && (port == INTERNET_DEFAULT_HTTP_PORT)) return TRUE;
 327     if ((scheme == INTERNET_SCHEME_HTTPS) && (port == INTERNET_DEFAULT_HTTPS_PORT)) return TRUE;
 328     return FALSE;
 329 }
 330
 331 static DWORD comp_length( DWORD len, DWORD flags, WCHAR *comp )
 332 {
 333     DWORD ret;
 334     unsigned int i;
 335
 336     ret = len ? len : strlenW( comp );
 337     if (!(flags & ICU_ESCAPE)) return ret;
 338     for (i = 0; i < len; i++) if (need_escape( comp[i] )) ret += 2;
 339     return ret;
 340 }
 341
 342 static BOOL calc_length( URL_COMPONENTS *uc, DWORD flags, LPDWORD len )
 343 {
 344     static const WCHAR formatW[] = {'%','u',0};
 345     INTERNET_SCHEME scheme;
 346
 347     *len = 0;
 348     if (uc->lpszScheme)
 349     {
 350         DWORD scheme_len = comp_length( uc->dwSchemeLength, 0, uc->lpszScheme );
 351         *len += scheme_len;
 352         scheme = get_scheme( uc->lpszScheme, scheme_len );
 353     }
 354     else
 355     {
 356         scheme = uc->nScheme;
 357         if (!scheme) scheme = INTERNET_SCHEME_HTTP;
 358         *len += strlenW( get_scheme_string( scheme ) );
 359     }
 360     *len += 1; /* ':' */
 361     if (uc->lpszHostName) *len += 2; /* "//" */
 362
 363     if (uc->lpszUserName)
 364     {
 365         *len += comp_length( uc->dwUserNameLength, 0, uc->lpszUserName );
 366         *len += 1; /* "@" */
 367     }
 368     else
 369     {
 370         if (uc->lpszPassword)
 371         {
 372             set_last_error( ERROR_INVALID_PARAMETER );
 373             return FALSE;
 374         }
 375     }
 376     if (uc->lpszPassword)
 377     {
 378         *len += 1; /* ":" */
 379         *len += comp_length( uc->dwPasswordLength, 0, uc->lpszPassword );
 380     }
 381     if (uc->lpszHostName)
 382     {
 383         *len += comp_length( uc->dwHostNameLength, 0, uc->lpszHostName );
 384
 385         if (!uses_default_port( scheme, uc->nPort ))
 386         {
 387             WCHAR port[sizeof("65535")];
 388
 389             sprintfW( port, formatW, uc->nPort );
 390             *len += strlenW( port );
 391             *len += 1; /* ":" */
 392         }
 393         if (uc->lpszUrlPath && *uc->lpszUrlPath != '/') *len += 1; /* '/' */
 394     }
 395     if (uc->lpszUrlPath) *len += comp_length( uc->dwUrlPathLength, flags, uc->lpszUrlPath );
 396     if (uc->lpszExtraInfo) *len += comp_length( uc->dwExtraInfoLength, flags, uc->lpszExtraInfo );
 397     return TRUE;
 398 }
 399
 400 /***********************************************************************
 401  *          WinHttpCreateUrl (winhttp.@)
 402  */
 403 BOOL WINAPI WinHttpCreateUrl( LPURL_COMPONENTS uc, DWORD flags, LPWSTR url, LPDWORD required )
 404 {
 405     static const WCHAR formatW[] = {'%','u',0};
 406     static const WCHAR twoslashW[] = {'/','/'};
 407
 408     DWORD len;
 409     INTERNET_SCHEME scheme;
 410
 411     TRACE("%p, 0x%08x, %p, %p\n", uc, flags, url, required);
 412
 413     if (!uc || uc->dwStructSize != sizeof(URL_COMPONENTS) || !required || !url)
 414     {
 415         set_last_error( ERROR_INVALID_PARAMETER );
 416         return FALSE;
 417     }
 418
 419     if (!calc_length( uc, flags, &len )) return FALSE;
 420
 421     if (*required < len)
 422     {
 423         *required = len + 1;
 424         set_last_error( ERROR_INSUFFICIENT_BUFFER );
 425         return FALSE;
 426     }
 427
 428     url[0] = 0;
 429     *required = len;
 430     if (uc->lpszScheme)
 431     {
 432         len = comp_length( uc->dwSchemeLength, 0, uc->lpszScheme );
 433         memcpy( url, uc->lpszScheme, len * sizeof(WCHAR) );
 434         url += len;
 435
 436         scheme = get_scheme( uc->lpszScheme, len );
 437     }
 438     else
 439     {
 440         const WCHAR *schemeW;
 441         scheme = uc->nScheme;
 442
 443         if (!scheme) scheme = INTERNET_SCHEME_HTTP;
 444
 445         schemeW = get_scheme_string( scheme );
 446         len = strlenW( schemeW );
 447         memcpy( url, schemeW, len * sizeof(WCHAR) );
 448         url += len;
 449     }
 450
 451     /* all schemes are followed by at least a colon */
 452     *url = ':';
 453     url++;
 454
 455     if (uc->lpszHostName)
 456     {
 457         memcpy( url, twoslashW, sizeof(twoslashW) );
 458         url += sizeof(twoslashW) / sizeof(twoslashW[0]);
 459     }
 460     if (uc->lpszUserName)
 461     {
 462         len = comp_length( uc->dwUserNameLength, 0, uc->lpszUserName );
 463         memcpy( url, uc->lpszUserName, len * sizeof(WCHAR) );
 464         url += len;
 465
 466         if (uc->lpszPassword)
 467         {
 468             *url = ':';
 469             url++;
 470
 471             len = comp_length( uc->dwPasswordLength, 0, uc->lpszPassword );
 472             memcpy( url, uc->lpszPassword, len * sizeof(WCHAR) );
 473             url += len;
 474         }
 475         *url = '@';
 476         url++;
 477     }
 478     if (uc->lpszHostName)
 479     {
 480         len = comp_length( uc->dwHostNameLength, 0, uc->lpszHostName );
 481         memcpy( url, uc->lpszHostName, len * sizeof(WCHAR) );
 482         url += len;
 483
 484         if (!uses_default_port( scheme, uc->nPort ))
 485         {
 486             WCHAR port[sizeof("65535")];
 487
 488             sprintfW( port, formatW, uc->nPort );
 489             *url = ':';
 490             url++;
 491
 492             len = strlenW( port );
 493             memcpy( url, port, len * sizeof(WCHAR) );
 494             url += len;
 495         }
 496
 497         /* add slash between hostname and path if necessary */
 498         if (uc->lpszUrlPath && *uc->lpszUrlPath != '/')
 499         {
 500             *url = '/';
 501             url++;
 502         }
 503     }
 504     if (uc->lpszUrlPath)
 505     {
 506         len = comp_length( uc->dwUrlPathLength, 0, uc->lpszUrlPath );
 507         if (flags & ICU_ESCAPE) url += copy_escape( url, uc->lpszUrlPath, len );
 508         else
 509         {
 510             memcpy( url, uc->lpszUrlPath, len * sizeof(WCHAR) );
 511             url += len;
 512         }
 513     }
 514     if (uc->lpszExtraInfo)
 515     {
 516         len = comp_length( uc->dwExtraInfoLength, 0, uc->lpszExtraInfo );
 517         if (flags & ICU_ESCAPE) url += copy_escape( url, uc->lpszExtraInfo, len );
 518         else
 519         {
 520             memcpy( url, uc->lpszExtraInfo, len * sizeof(WCHAR) );
 521             url += len;
 522         }
 523     }
 524     *url = 0;
 525     return TRUE;
 526 }