dll/win32/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 "winhttp_private.h"
  20
  21 static const WCHAR scheme_http[] = {'h','t','t','p',0};
  22 static const WCHAR scheme_https[] = {'h','t','t','p','s',0};
  23
  24 static BOOL set_component( WCHAR **str, DWORD *str_len, WCHAR *value, DWORD len, DWORD flags )
  25 {
  26     if (*str && !*str_len)
  27     {
  28         set_last_error( ERROR_INVALID_PARAMETER );
  29         return FALSE;
  30     }
  31     if (!*str_len) return TRUE;
  32     if (!*str)
  33     {
  34         if (len && *str_len && (flags & (ICU_DECODE|ICU_ESCAPE)))
  35         {
  36             set_last_error( ERROR_INVALID_PARAMETER );
  37             return FALSE;
  38         }
  39         *str = value;
  40         *str_len = len;
  41     }
  42     else
  43     {
  44         if (len > (*str_len) - 1)
  45         {
  46             *str_len = len + 1;
  47             set_last_error( ERROR_INSUFFICIENT_BUFFER );
  48             return FALSE;
  49         }
  50         memcpy( *str, value, len * sizeof(WCHAR) );
  51         (*str)[len] = 0;
  52         *str_len = len;
  53     }
  54     return TRUE;
  55 }
  56
  57 static WCHAR *decode_url( LPCWSTR url, DWORD *len )
  58 {
  59     const WCHAR *p = url;
  60     WCHAR hex[3], *q, *ret;
  61
  62     if (!(ret = heap_alloc( *len * sizeof(WCHAR) ))) return NULL;
  63     q = ret;
  64     while (*len > 0)
  65     {
  66         if (p[0] == '%' && isxdigitW( p[1] ) && isxdigitW( p[2] ))
  67         {
  68             hex[0] = p[1];
  69             hex[1] = p[2];
  70             hex[2] = 0;
  71             *q++ = strtolW( hex, NULL, 16 );
  72             p += 3;
  73             *len -= 3;
  74         }
  75         else
  76         {
  77             *q++ = *p++;
  78             *len -= 1;
  79         }
  80     }
  81     *len = q - ret;
  82     return ret;
  83 }
  84
  85 static BOOL need_escape( WCHAR c )
  86 {
  87     if (isalnumW( c )) return FALSE;
  88
  89     if (c <= 31 || c >= 127) return TRUE;
  90     else
  91     {
  92         switch (c)
  93         {
  94         case ' ':
  95         case '"':
  96         case '#':
  97         case '%':
  98         case '<':
  99         case '>':
 100         case ']':
 101         case '\\':
 102         case '[':
 103         case '^':
 104         case '`':
 105         case '{':
 106         case '|':
 107         case '}':
 108         case '~':
 109             return TRUE;
 110         default:
 111             return FALSE;
 112         }
 113     }
 114 }
 115
 116 static DWORD copy_escape( WCHAR *dst, const WCHAR *src, DWORD len )
 117 {
 118     static const WCHAR hex[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
 119     DWORD ret = len;
 120     unsigned int i;
 121     WCHAR *p = dst;
 122
 123     for (i = 0; i < len; i++, p++)
 124     {
 125         if (need_escape( src[i] ))
 126         {
 127             p[0] = '%';
 128             p[1] = hex[(src[i] >> 4) & 0xf];
 129             p[2] = hex[src[i] & 0xf];
 130             ret += 2;
 131             p += 2;
 132         }
 133         else *p = src[i];
 134     }
 135     dst[ret] = 0;
 136     return ret;
 137 }
 138
 139 static WCHAR *escape_url( LPCWSTR url, DWORD *len )
 140 {
 141     WCHAR *ret;
 142     const WCHAR *p, *q;
 143
 144     if ((p = q = strrchrW( url, '/' )))
 145     {
 146         while (*q)
 147         {
 148             if (need_escape( *q )) *len += 2;
 149             q++;
 150         }
 151     }
 152     if (!(ret = heap_alloc( (*len + 1) * sizeof(WCHAR) ))) return NULL;
 153     if (!p) strcpyW( ret, url );
 154     else
 155     {
 156         memcpy( ret, url, (p - url) * sizeof(WCHAR) );
 157         copy_escape( ret + (p - url), p, q - p );
 158     }
 159     return ret;
 160 }
 161
 162 /***********************************************************************
 163  *          WinHttpCrackUrl (winhttp.@)
 164  */
 165 BOOL WINAPI WinHttpCrackUrl( LPCWSTR url, DWORD len, DWORD flags, LPURL_COMPONENTSW uc )
 166 {
 167     BOOL ret = FALSE;
 168     WCHAR *p, *q, *r, *url_decoded = NULL, *url_escaped = NULL;
 169     INTERNET_SCHEME scheme = 0;
 170
 171     TRACE("%s, %d, %x, %p\n", debugstr_w(url), len, flags, uc);
 172
 173     if (!url || !uc || uc->dwStructSize != sizeof(URL_COMPONENTS))
 174     {
 175         set_last_error( ERROR_INVALID_PARAMETER );
 176         return FALSE;
 177     }
 178     if (!len) len = strlenW( url );
 179
 180     if (flags & ICU_ESCAPE)
 181     {
 182         if (!(url_escaped = escape_url( url, &len )))
 183         {
 184             set_last_error( ERROR_OUTOFMEMORY );
 185             return FALSE;
 186         }
 187         url = url_escaped;
 188     }
 189     else if (flags & ICU_DECODE)
 190     {
 191         if (!(url_decoded = decode_url( url, &len )))
 192         {
 193             set_last_error( ERROR_OUTOFMEMORY );
 194             return FALSE;
 195         }
 196         url = url_decoded;
 197     }
 198     if (!(p = strchrW( url, ':' )))
 199     {
 200         set_last_error( ERROR_WINHTTP_UNRECOGNIZED_SCHEME );
 201         return FALSE;
 202     }
 203     if (p - url == 4 && !strncmpiW( url, scheme_http, 4 )) scheme = INTERNET_SCHEME_HTTP;
 204     else if (p - url == 5 && !strncmpiW( url, scheme_https, 5 )) scheme = INTERNET_SCHEME_HTTPS;
 205     else
 206     {
 207         set_last_error( ERROR_WINHTTP_UNRECOGNIZED_SCHEME );
 208         goto exit;
 209     }
 210     if (!(set_component( &uc->lpszScheme, &uc->dwSchemeLength, (WCHAR *)url, p - url, flags ))) goto exit;
 211
 212     p++; /* skip ':' */
 213     if (!p[0] || p[0] != '/' || p[1] != '/') goto exit;
 214     p += 2;
 215
 216     if (!p[0]) goto exit;
 217     if ((q = memchrW( p, '@', len - (p - url) )) && !(memchrW( p, '/', q - p )))
 218     {
 219         if ((r = memchrW( p, ':', q - p )))
 220         {
 221             if (!(set_component( &uc->lpszUserName, &uc->dwUserNameLength, p, r - p, flags ))) goto exit;
 222             r++;
 223             if (!(set_component( &uc->lpszPassword, &uc->dwPasswordLength, r, q - r, flags ))) goto exit;
 224         }
 225         else
 226         {
 227             if (!(set_component( &uc->lpszUserName, &uc->dwUserNameLength, p, q - p, flags ))) goto exit;
 228             if (!(set_component( &uc->lpszPassword, &uc->dwPasswordLength, NULL, 0, flags ))) goto exit;
 229         }
 230         p = q + 1;
 231     }
 232     else
 233     {
 234         if (!(set_component( &uc->lpszUserName, &uc->dwUserNameLength, NULL, 0, flags ))) goto exit;
 235         if (!(set_component( &uc->lpszPassword, &uc->dwPasswordLength, NULL, 0, flags ))) goto exit;
 236     }
 237     if ((q = memchrW( p, '/', len - (p - url) )))
 238     {
 239         if ((r = memchrW( p, ':', q - p )))
 240         {
 241             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, r - p, flags ))) goto exit;
 242             r++;
 243             uc->nPort = atoiW( r );
 244         }
 245         else
 246         {
 247             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, q - p, flags ))) goto exit;
 248             if (scheme == INTERNET_SCHEME_HTTP) uc->nPort = INTERNET_DEFAULT_HTTP_PORT;
 249             if (scheme == INTERNET_SCHEME_HTTPS) uc->nPort = INTERNET_DEFAULT_HTTPS_PORT;
 250         }
 251
 252         if ((r = memchrW( q, '?', len - (q - url) )))
 253         {
 254             if (!(set_component( &uc->lpszUrlPath, &uc->dwUrlPathLength, q, r - q, flags ))) goto exit;
 255             if (!(set_component( &uc->lpszExtraInfo, &uc->dwExtraInfoLength, r, len - (r - url), flags ))) goto exit;
 256         }
 257         else
 258         {
 259             if (!(set_component( &uc->lpszUrlPath, &uc->dwUrlPathLength, q, len - (q - url), flags ))) goto exit;
 260             if (!(set_component( &uc->lpszExtraInfo, &uc->dwExtraInfoLength, (WCHAR *)url + len, 0, flags ))) goto exit;
 261         }
 262     }
 263     else
 264     {
 265         if ((r = memchrW( p, ':', len - (p - url) )))
 266         {
 267             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, r - p, flags ))) goto exit;
 268             r++;
 269             uc->nPort = atoiW( r );
 270         }
 271         else
 272         {
 273             if (!(set_component( &uc->lpszHostName, &uc->dwHostNameLength, p, len - (p - url), flags ))) goto exit;
 274             if (scheme == INTERNET_SCHEME_HTTP) uc->nPort = INTERNET_DEFAULT_HTTP_PORT;
 275             if (scheme == INTERNET_SCHEME_HTTPS) uc->nPort = INTERNET_DEFAULT_HTTPS_PORT;
 276         }
 277         if (!(set_component( &uc->lpszUrlPath, &uc->dwUrlPathLength, (WCHAR *)url + len, 0, flags ))) goto exit;
 278         if (!(set_component( &uc->lpszExtraInfo, &uc->dwExtraInfoLength, (WCHAR *)url + len, 0, flags ))) goto exit;
 279     }
 280
 281     ret = TRUE;
 282
 283     TRACE("scheme(%s) host(%s) port(%d) path(%s) extra(%s)\n",
 284           debugstr_wn( uc->lpszScheme, uc->dwSchemeLength ),
 285           debugstr_wn( uc->lpszHostName, uc->dwHostNameLength ),
 286           uc->nPort,
 287           debugstr_wn( uc->lpszUrlPath, uc->dwUrlPathLength ),
 288           debugstr_wn( uc->lpszExtraInfo, uc->dwExtraInfoLength ));
 289
 290 exit:
 291     if (ret) uc->nScheme = scheme;
 292     heap_free( url_decoded );
 293     heap_free( url_escaped );
 294     return ret;
 295 }
 296
 297 static INTERNET_SCHEME get_scheme( const WCHAR *scheme, DWORD len )
 298 {
 299     if (!strncmpW( scheme, scheme_http, len )) return INTERNET_SCHEME_HTTP;
 300     if (!strncmpW( scheme, scheme_https, len )) return INTERNET_SCHEME_HTTPS;
 301     return 0;
 302 }
 303
 304 static const WCHAR *get_scheme_string( INTERNET_SCHEME scheme )
 305 {
 306     if (scheme == INTERNET_SCHEME_HTTP) return scheme_http;
 307     if (scheme == INTERNET_SCHEME_HTTPS) return scheme_https;
 308     return NULL;
 309 }
 310
 311 static BOOL uses_default_port( INTERNET_SCHEME scheme, INTERNET_PORT port )
 312 {
 313     if ((scheme == INTERNET_SCHEME_HTTP) && (port == INTERNET_DEFAULT_HTTP_PORT)) return TRUE;
 314     if ((scheme == INTERNET_SCHEME_HTTPS) && (port == INTERNET_DEFAULT_HTTPS_PORT)) return TRUE;
 315     return FALSE;
 316 }
 317
 318 static DWORD comp_length( DWORD len, DWORD flags, WCHAR *comp )
 319 {
 320     DWORD ret;
 321     unsigned int i;
 322
 323     ret = len ? len : strlenW( comp );
 324     if (!(flags & ICU_ESCAPE)) return ret;
 325     for (i = 0; i < len; i++) if (need_escape( comp[i] )) ret += 2;
 326     return ret;
 327 }
 328
 329 static BOOL calc_length( URL_COMPONENTS *uc, DWORD flags, LPDWORD len )
 330 {
 331     static const WCHAR formatW[] = {'%','u',0};
 332     INTERNET_SCHEME scheme;
 333
 334     *len = 0;
 335     if (uc->lpszScheme)
 336     {
 337         DWORD scheme_len = comp_length( uc->dwSchemeLength, 0, uc->lpszScheme );
 338         *len += scheme_len;
 339         scheme = get_scheme( uc->lpszScheme, scheme_len );
 340     }
 341     else
 342     {
 343         scheme = uc->nScheme;
 344         if (!scheme) scheme = INTERNET_SCHEME_HTTP;
 345         *len += strlenW( get_scheme_string( scheme ) );
 346     }
 347     *len += 1; /* ':' */
 348     if (uc->lpszHostName) *len += 2; /* "//" */
 349
 350     if (uc->lpszUserName)
 351     {
 352         *len += comp_length( uc->dwUserNameLength, 0, uc->lpszUserName );
 353         *len += 1; /* "@" */
 354     }
 355     else
 356     {
 357         if (uc->lpszPassword)
 358         {
 359             set_last_error( ERROR_INVALID_PARAMETER );
 360             return FALSE;
 361         }
 362     }
 363     if (uc->lpszPassword)
 364     {
 365         *len += 1; /* ":" */
 366         *len += comp_length( uc->dwPasswordLength, 0, uc->lpszPassword );
 367     }
 368     if (uc->lpszHostName)
 369     {
 370         *len += comp_length( uc->dwHostNameLength, 0, uc->lpszHostName );
 371
 372         if (!uses_default_port( scheme, uc->nPort ))
 373         {
 374             WCHAR port[sizeof("65535")];
 375
 376             sprintfW( port, formatW, uc->nPort );
 377             *len += strlenW( port );
 378             *len += 1; /* ":" */
 379         }
 380         if (uc->lpszUrlPath && *uc->lpszUrlPath != '/') *len += 1; /* '/' */
 381     }
 382     if (uc->lpszUrlPath) *len += comp_length( uc->dwUrlPathLength, flags, uc->lpszUrlPath );
 383     if (uc->lpszExtraInfo) *len += comp_length( uc->dwExtraInfoLength, flags, uc->lpszExtraInfo );
 384     return TRUE;
 385 }
 386
 387 /***********************************************************************
 388  *          WinHttpCreateUrl (winhttp.@)
 389  */
 390 BOOL WINAPI WinHttpCreateUrl( LPURL_COMPONENTS uc, DWORD flags, LPWSTR url, LPDWORD required )
 391 {
 392     static const WCHAR formatW[] = {'%','u',0};
 393     static const WCHAR twoslashW[] = {'/','/'};
 394
 395     DWORD len;
 396     INTERNET_SCHEME scheme;
 397
 398     TRACE("%p, 0x%08x, %p, %p\n", uc, flags, url, required);
 399
 400     if (!uc || uc->dwStructSize != sizeof(URL_COMPONENTS) || !required || !url)
 401     {
 402         set_last_error( ERROR_INVALID_PARAMETER );
 403         return FALSE;
 404     }
 405
 406     if (!calc_length( uc, flags, &len )) return FALSE;
 407
 408     if (*required < len)
 409     {
 410         *required = len + 1;
 411         set_last_error( ERROR_INSUFFICIENT_BUFFER );
 412         return FALSE;
 413     }
 414
 415     url[0] = 0;
 416     *required = len;
 417     if (uc->lpszScheme)
 418     {
 419         len = comp_length( uc->dwSchemeLength, 0, uc->lpszScheme );
 420         memcpy( url, uc->lpszScheme, len * sizeof(WCHAR) );
 421         url += len;
 422
 423         scheme = get_scheme( uc->lpszScheme, len );
 424     }
 425     else
 426     {
 427         const WCHAR *schemeW;
 428         scheme = uc->nScheme;
 429
 430         if (!scheme) scheme = INTERNET_SCHEME_HTTP;
 431
 432         schemeW = get_scheme_string( scheme );
 433         len = strlenW( schemeW );
 434         memcpy( url, schemeW, len * sizeof(WCHAR) );
 435         url += len;
 436     }
 437
 438     /* all schemes are followed by at least a colon */
 439     *url = ':';
 440     url++;
 441
 442     if (uc->lpszHostName)
 443     {
 444         memcpy( url, twoslashW, sizeof(twoslashW) );
 445         url += sizeof(twoslashW) / sizeof(twoslashW[0]);
 446     }
 447     if (uc->lpszUserName)
 448     {
 449         len = comp_length( uc->dwUserNameLength, 0, uc->lpszUserName );
 450         memcpy( url, uc->lpszUserName, len * sizeof(WCHAR) );
 451         url += len;
 452
 453         if (uc->lpszPassword)
 454         {
 455             *url = ':';
 456             url++;
 457
 458             len = comp_length( uc->dwPasswordLength, 0, uc->lpszPassword );
 459             memcpy( url, uc->lpszPassword, len * sizeof(WCHAR) );
 460             url += len;
 461         }
 462         *url = '@';
 463         url++;
 464     }
 465     if (uc->lpszHostName)
 466     {
 467         len = comp_length( uc->dwHostNameLength, 0, uc->lpszHostName );
 468         memcpy( url, uc->lpszHostName, len * sizeof(WCHAR) );
 469         url += len;
 470
 471         if (!uses_default_port( scheme, uc->nPort ))
 472         {
 473             WCHAR port[sizeof("65535")];
 474
 475             sprintfW( port, formatW, uc->nPort );
 476             *url = ':';
 477             url++;
 478
 479             len = strlenW( port );
 480             memcpy( url, port, len * sizeof(WCHAR) );
 481             url += len;
 482         }
 483
 484         /* add slash between hostname and path if necessary */
 485         if (uc->lpszUrlPath && *uc->lpszUrlPath != '/')
 486         {
 487             *url = '/';
 488             url++;
 489         }
 490     }
 491     if (uc->lpszUrlPath)
 492     {
 493         len = comp_length( uc->dwUrlPathLength, 0, uc->lpszUrlPath );
 494         if (flags & ICU_ESCAPE) url += copy_escape( url, uc->lpszUrlPath, len );
 495         else
 496         {
 497             memcpy( url, uc->lpszUrlPath, len * sizeof(WCHAR) );
 498             url += len;
 499         }
 500     }
 501     if (uc->lpszExtraInfo)
 502     {
 503         len = comp_length( uc->dwExtraInfoLength, 0, uc->lpszExtraInfo );
 504         if (flags & ICU_ESCAPE) url += copy_escape( url, uc->lpszExtraInfo, len );
 505         else
 506         {
 507             memcpy( url, uc->lpszExtraInfo, len * sizeof(WCHAR) );
 508             url += len;
 509         }
 510     }
 511     *url = 0;
 512     return TRUE;
 513 }