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 <glib/gprintf.h>
  32 #include <gtk/gtk.h>
  33
  34 #include <curl/curl.h>
  35
  36 #include "file.h"
  37 #include "globals.h"
  38 #include "curl_download.h"
  39
  40 gchar *curl_download_user_agent;
  41
  42 /*
  43  * Even if writing to FILE* is supported by libcurl by default,
  44  * it seems that it is non-portable (win32 DLL specific).
  45  *
  46  * So, we provide our own trivial CURLOPT_WRITEFUNCTION.
  47  */
  48 static size_t curl_write_func(void *ptr, size_t size, size_t nmemb, FILE *stream)
  49 {
  50   return fwrite(ptr, size, nmemb, stream);
  51 }
  52
  53 static gchar *get_cookie_file(gboolean init)
  54 {
  55   static gchar *cookie_file = NULL;
  56   static GMutex *mutex = NULL;
  57
  58   if (init) { /* to make sure  it's thread safe */
  59     mutex = g_mutex_new();
  60     static gchar *cookie_fn = "cookies.txt";
  61     const gchar *viking_dir = a_get_viking_dir();
  62     cookie_file = g_build_filename(viking_dir, cookie_fn, NULL);
  63     g_unlink(cookie_file);
  64     return NULL;
  65   }
  66
  67   g_assert(cookie_file != NULL);
  68
  69   g_mutex_lock(mutex);
  70   if (g_file_test(cookie_file, G_FILE_TEST_EXISTS) == FALSE) {  /* file not there */
  71     gchar * name_tmp = NULL;
  72     FILE * out_file = tmpfile();
  73     if (out_file == NULL) {
  74       // Something wrong with previous call (unsuported?)
  75       name_tmp = g_strdup_printf("%s.tmp", cookie_file);
  76       out_file = g_fopen(name_tmp, "w+b");
  77     }
  78     CURLcode res;
  79     CURL *curl = curl_easy_init();
  80     if (vik_verbose)
  81       curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 );
  82     curl_easy_setopt(curl, CURLOPT_URL, "http://maps.google.com/"); /* google.com sets "PREF" cookie */
  83     curl_easy_setopt ( curl, CURLOPT_WRITEDATA, out_file );
  84     curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func);
  85     curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie_file);
  86     res = curl_easy_perform(curl);
  87     if (res != CURLE_OK) {
  88       g_warning(_("%s() Curl perform failed: %s"), __PRETTY_FUNCTION__,
  89           curl_easy_strerror(res));
  90       g_unlink(cookie_file);
  91     }
  92     curl_easy_cleanup(curl);
  93     fclose(out_file);
  94     out_file = NULL;
  95     if (name_tmp != NULL) {
  96       g_remove(name_tmp);
  97       g_free(name_tmp);
  98       name_tmp = NULL;
  99     }
 100   }
 101   g_mutex_unlock(mutex);
 102
 103   return(cookie_file);
 104 }
 105
 106 /* This should to be called from main() to make sure thread safe */
 107 void curl_download_init()
 108 {
 109   curl_global_init(CURL_GLOBAL_ALL);
 110   get_cookie_file(TRUE);
 111   curl_download_user_agent = g_strdup_printf ("%s/%s %s", PACKAGE, VERSION, curl_version());
 112 }
 113
 114 int curl_download_uri ( const char *uri, FILE *f, DownloadOptions *options )
 115 {
 116   CURL *curl;
 117   CURLcode res = CURLE_FAILED_INIT;
 118   const gchar *cookie_file;
 119
 120   g_debug("%s: uri=%s", __PRETTY_FUNCTION__, uri);
 121
 122   curl = curl_easy_init ();
 123   if ( curl )
 124     {
 125       if (vik_verbose)
 126         curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 );
 127       curl_easy_setopt ( curl, CURLOPT_URL, uri );
 128       curl_easy_setopt ( curl, CURLOPT_WRITEDATA, f );
 129       curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func);
 130       if (options != NULL) {
 131         if(options->referer != NULL)
 132           curl_easy_setopt ( curl, CURLOPT_REFERER, options->referer);
 133         if(options->follow_location != 0) {
 134           curl_easy_setopt ( curl, CURLOPT_FOLLOWLOCATION, 1);
 135           curl_easy_setopt ( curl, CURLOPT_MAXREDIRS, options->follow_location);
 136         }
 137       }
 138       curl_easy_setopt ( curl, CURLOPT_USERAGENT, curl_download_user_agent );
 139       if ((cookie_file = get_cookie_file(FALSE)) != NULL)
 140         curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie_file);
 141       res = curl_easy_perform ( curl );
 142       curl_easy_cleanup ( curl );
 143     }
 144   return(res);
 145 }
 146
 147 int curl_download_get_url ( const char *hostname, const char *uri, FILE *f, DownloadOptions *options, gboolean ftp )
 148 {
 149   int ret;
 150   gchar *full = NULL;
 151
 152   /* Compose the full url */
 153   full = g_strdup_printf ( "%s://%s%s", (ftp?"ftp":"http"), hostname, uri );
 154   ret = curl_download_uri ( full, f, options );
 155   g_free ( full );
 156   full = NULL;
 157
 158   return (ret ? -2 : 0);   /* -2 HTTP error */
 159 }