lib/share.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ***************************************************************************/
  22
  23 #include "setup.h"
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <curl/curl.h>
  28 #include "urldata.h"
  29 #include "share.h"
  30 #include "curl_memory.h"
  31
  32 /* The last #include file should be: */
  33 #include "memdebug.h"
  34
  35 CURLSH *
  36 curl_share_init(void)
  37 {
  38   struct Curl_share *share = calloc(1, sizeof(struct Curl_share));
  39   if(share)
  40     share->specifier |= (1<<CURL_LOCK_DATA_SHARE);
  41
  42   return share;
  43 }
  44
  45 #undef curl_share_setopt
  46 CURLSHcode
  47 curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
  48 {
  49   struct Curl_share *share = (struct Curl_share *)sh;
  50   va_list param;
  51   int type;
  52   curl_lock_function lockfunc;
  53   curl_unlock_function unlockfunc;
  54   void *ptr;
  55
  56   if(share->dirty)
  57     /* don't allow setting options while one or more handles are already
  58        using this share */
  59     return CURLSHE_IN_USE;
  60
  61   va_start(param, option);
  62
  63   switch(option) {
  64   case CURLSHOPT_SHARE:
  65     /* this is a type this share will share */
  66     type = va_arg(param, int);
  67     share->specifier |= (1<<type);
  68     switch( type ) {
  69     case CURL_LOCK_DATA_DNS:
  70       if(!share->hostcache) {
  71         share->hostcache = Curl_mk_dnscache();
  72         if(!share->hostcache)
  73           return CURLSHE_NOMEM;
  74       }
  75       break;
  76
  77 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
  78     case CURL_LOCK_DATA_COOKIE:
  79       if(!share->cookies) {
  80         share->cookies = Curl_cookie_init(NULL, NULL, NULL, TRUE );
  81         if(!share->cookies)
  82           return CURLSHE_NOMEM;
  83       }
  84       break;
  85 #endif   /* CURL_DISABLE_HTTP */
  86
  87     case CURL_LOCK_DATA_SSL_SESSION: /* not supported (yet) */
  88     case CURL_LOCK_DATA_CONNECT:     /* not supported (yet) */
  89
  90     default:
  91       return CURLSHE_BAD_OPTION;
  92     }
  93     break;
  94
  95   case CURLSHOPT_UNSHARE:
  96     /* this is a type this share will no longer share */
  97     type = va_arg(param, int);
  98     share->specifier &= ~(1<<type);
  99     switch( type )
 100     {
 101       case CURL_LOCK_DATA_DNS:
 102         if(share->hostcache) {
 103           Curl_hash_destroy(share->hostcache);
 104           share->hostcache = NULL;
 105         }
 106         break;
 107
 108 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
 109       case CURL_LOCK_DATA_COOKIE:
 110         if(share->cookies) {
 111           Curl_cookie_cleanup(share->cookies);
 112           share->cookies = NULL;
 113         }
 114         break;
 115 #endif   /* CURL_DISABLE_HTTP */
 116
 117       case CURL_LOCK_DATA_SSL_SESSION:
 118         break;
 119
 120       case CURL_LOCK_DATA_CONNECT:
 121         break;
 122
 123       default:
 124         return CURLSHE_BAD_OPTION;
 125     }
 126     break;
 127
 128   case CURLSHOPT_LOCKFUNC:
 129     lockfunc = va_arg(param, curl_lock_function);
 130     share->lockfunc = lockfunc;
 131     break;
 132
 133   case CURLSHOPT_UNLOCKFUNC:
 134     unlockfunc = va_arg(param, curl_unlock_function);
 135     share->unlockfunc = unlockfunc;
 136     break;
 137
 138   case CURLSHOPT_USERDATA:
 139     ptr = va_arg(param, void *);
 140     share->clientdata = ptr;
 141     break;
 142
 143   default:
 144     return CURLSHE_BAD_OPTION;
 145   }
 146
 147   return CURLSHE_OK;
 148 }
 149
 150 CURLSHcode
 151 curl_share_cleanup(CURLSH *sh)
 152 {
 153   struct Curl_share *share = (struct Curl_share *)sh;
 154
 155   if(share == NULL)
 156     return CURLSHE_INVALID;
 157
 158   if(share->lockfunc)
 159     share->lockfunc(NULL, CURL_LOCK_DATA_SHARE, CURL_LOCK_ACCESS_SINGLE,
 160                     share->clientdata);
 161
 162   if(share->dirty) {
 163     if(share->unlockfunc)
 164       share->unlockfunc(NULL, CURL_LOCK_DATA_SHARE, share->clientdata);
 165     return CURLSHE_IN_USE;
 166   }
 167
 168   if(share->hostcache) {
 169     Curl_hash_destroy(share->hostcache);
 170     share->hostcache = NULL;
 171   }
 172
 173 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
 174   if(share->cookies)
 175     Curl_cookie_cleanup(share->cookies);
 176 #endif   /* CURL_DISABLE_HTTP */
 177
 178   if(share->unlockfunc)
 179     share->unlockfunc(NULL, CURL_LOCK_DATA_SHARE, share->clientdata);
 180   free(share);
 181
 182   return CURLSHE_OK;
 183 }
 184
 185
 186 CURLSHcode
 187 Curl_share_lock(struct SessionHandle *data, curl_lock_data type,
 188                 curl_lock_access accesstype)
 189 {
 190   struct Curl_share *share = data->share;
 191
 192   if(share == NULL)
 193     return CURLSHE_INVALID;
 194
 195   if(share->specifier & (1<<type)) {
 196     if(share->lockfunc) /* only call this if set! */
 197       share->lockfunc(data, type, accesstype, share->clientdata);
 198   }
 199   /* else if we don't share this, pretend successful lock */
 200
 201   return CURLSHE_OK;
 202 }
 203
 204 CURLSHcode
 205 Curl_share_unlock(struct SessionHandle *data, curl_lock_data type)
 206 {
 207   struct Curl_share *share = data->share;
 208
 209   if(share == NULL)
 210     return CURLSHE_INVALID;
 211
 212   if(share->specifier & (1<<type)) {
 213     if(share->unlockfunc) /* only call this if set! */
 214       share->unlockfunc (data, type, share->clientdata);
 215   }
 216
 217   return CURLSHE_OK;
 218 }