src/curl_download.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #include <glib.h>
  29 #include <glib/gstdio.h>
  30 #include <glib/gi18n.h>
  31 #include <gtk/gtk.h>
  32
  33 #include <curl/curl.h>
  34
  35 #include "file.h"
  36 #include "globals.h"
  37 #include "curl_download.h"
  38
  39 /*
  40  * Even if writing to FILE* is supported by libcurl by default,
  41  * it seems that it is non-portable (win32 DLL specific).
  42  *
  43  * So, we provide our own trivial CURLOPT_WRITEFUNCTION.
  44  */
  45 static size_t curl_write_func(void *ptr, size_t size, size_t nmemb, FILE *stream)
  46 {
  47   return fwrite(ptr, size, nmemb, stream);
  48 }
  49
  50 static gchar *get_cookie_file(gboolean init)
  51 {
  52   static gchar *cookie_file = NULL;
  53   static GMutex *mutex = NULL;
  54
  55   if (init) { /* to make sure  it's thread safe */
  56     mutex = g_mutex_new();
  57     static gchar *cookie_fn = "cookies.txt";
  58     const gchar *viking_dir = a_get_viking_dir();
  59     cookie_file = g_build_filename(viking_dir, cookie_fn, NULL);
  60     g_unlink(cookie_file);
  61     return NULL;
  62   }
  63
  64   g_assert(cookie_file != NULL);
  65
  66   g_mutex_lock(mutex);
  67   if (g_file_test(cookie_file, G_FILE_TEST_EXISTS) == FALSE) {  /* file not there */
  68     gchar * name_tmp = NULL;
  69     FILE * out_file = tmpfile();
  70     if (out_file == NULL) {
  71       // Something wrong with previous call (unsuported?)
  72       name_tmp = g_strdup_printf("%s.tmp", cookie_file);
  73       out_file = g_fopen(name_tmp, "w+b");
  74     }
  75     CURLcode res;
  76     CURL *curl = curl_easy_init();
  77     if (vik_verbose)
  78       curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 );
  79     curl_easy_setopt(curl, CURLOPT_URL, "http://maps.google.com/"); /* google.com sets "PREF" cookie */
  80     curl_easy_setopt ( curl, CURLOPT_FILE, out_file );
  81     curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func);
  82     curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie_file);
  83     res = curl_easy_perform(curl);
  84     if (res != CURLE_OK) {
  85       g_warning(_("%s() Curl perform failed: %s"), __PRETTY_FUNCTION__,
  86           curl_easy_strerror(res));
  87       g_unlink(cookie_file);
  88     }
  89     curl_easy_cleanup(curl);
  90     fclose(out_file);
  91     out_file = NULL;
  92     if (name_tmp != NULL) {
  93       g_remove(name_tmp);
  94       g_free(name_tmp);
  95       name_tmp = NULL;
  96     }
  97   }
  98   g_mutex_unlock(mutex);
  99
 100   return(cookie_file);
 101 }
 102
 103 /* This should to be called from main() to make sure thread safe */
 104 void curl_download_init()
 105 {
 106   curl_global_init(CURL_GLOBAL_ALL);
 107   get_cookie_file(TRUE);
 108 }
 109
 110 int curl_download_uri ( const char *uri, FILE *f, DownloadOptions *options )
 111 {
 112   CURL *curl;
 113   CURLcode res = CURLE_FAILED_INIT;
 114   const gchar *cookie_file;
 115
 116   g_debug("%s: uri=%s", __PRETTY_FUNCTION__, uri);
 117
 118   curl = curl_easy_init ();
 119   if ( curl )
 120     {
 121       if (vik_verbose)
 122         curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 );
 123       curl_easy_setopt ( curl, CURLOPT_URL, uri );
 124       curl_easy_setopt ( curl, CURLOPT_FILE, f );
 125       curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func);
 126       if (options != NULL) {
 127         if(options->referer != NULL)
 128           curl_easy_setopt ( curl, CURLOPT_REFERER, options->referer);
 129         if(options->follow_location != 0) {
 130           curl_easy_setopt ( curl, CURLOPT_FOLLOWLOCATION, 1);
 131           curl_easy_setopt ( curl, CURLOPT_MAXREDIRS, options->follow_location);
 132         }
 133       }
 134       curl_easy_setopt ( curl, CURLOPT_USERAGENT, PACKAGE "/" VERSION " libcurl/7.15.4" );
 135       if ((cookie_file = get_cookie_file(FALSE)) != NULL)
 136         curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie_file);
 137       res = curl_easy_perform ( curl );
 138       curl_easy_cleanup ( curl );
 139     }
 140   return(res);
 141 }
 142
 143 int curl_download_get_url ( const char *hostname, const char *uri, FILE *f, DownloadOptions *options, gboolean ftp )
 144 {
 145   int ret;
 146   gchar *full = NULL;
 147
 148   /* Compose the full url */
 149   full = g_strdup_printf ( "%s://%s%s", (ftp?"ftp":"http"), hostname, uri );
 150   ret = curl_download_uri ( full, f, options );
 151   g_free ( full );
 152   full = NULL;
 153
 154   return (ret ? -2 : 0);   /* -2 HTTP error */
 155 }