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1 | /* | |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2007, Guilhem Bonnefille <guilhem.bonnefille@gmail.com> | |
5 | * Copyright (C) 2007, Quy Tonthat <qtonthat@gmail.com> | |
6 | * Copyright (C) 2009-2010, Jocelyn Jaubert <jocelyn.jaubert@gmail.com> | |
7 | * Copyright (C) 2010, Sven Wegener <sven.wegener@stealer.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #ifdef HAVE_CONFIG_H | |
26 | #include "config.h" | |
27 | #endif | |
28 | ||
29 | #include <stdio.h> | |
30 | #include <string.h> | |
31 | ||
32 | #ifdef HAVE_UNISTD_H | |
33 | #include <unistd.h> | |
34 | #endif | |
35 | ||
36 | #include <glib.h> | |
37 | #include <glib/gstdio.h> | |
38 | #include <glib/gi18n.h> | |
39 | #include <glib/gprintf.h> | |
40 | #include <gtk/gtk.h> | |
41 | ||
42 | #include <curl/curl.h> | |
43 | ||
44 | #include "background.h" | |
45 | #include "dir.h" | |
46 | #include "file.h" | |
47 | #include "globals.h" | |
48 | #include "curl_download.h" | |
49 | ||
50 | gchar *curl_download_user_agent = NULL; | |
51 | ||
52 | /* | |
53 | * Even if writing to FILE* is supported by libcurl by default, | |
54 | * it seems that it is non-portable (win32 DLL specific). | |
55 | * | |
56 | * So, we provide our own trivial CURLOPT_WRITEFUNCTION. | |
57 | */ | |
58 | static size_t curl_write_func(void *ptr, size_t size, size_t nmemb, FILE *stream) | |
59 | { | |
60 | return fwrite(ptr, size, nmemb, stream); | |
61 | } | |
62 | ||
63 | static size_t curl_get_etag_func(char *ptr, size_t size, size_t nmemb, void *stream) | |
64 | { | |
65 | #define ETAG_KEYWORD "ETag: " | |
66 | #define ETAG_LEN (sizeof(ETAG_KEYWORD)-1) | |
67 | gchar **etag = stream; | |
68 | size_t len = size*nmemb; | |
69 | char *str = g_strstr_len((const char*)ptr, len, ETAG_KEYWORD); | |
70 | if (str) { | |
71 | char *etag_str = str + ETAG_LEN; | |
72 | char *end_str = g_strstr_len(etag_str, len - ETAG_LEN, "\r\n"); | |
73 | if (etag_str && end_str) { | |
74 | *etag = g_strndup(etag_str, end_str - etag_str); | |
75 | g_debug("%s: ETAG found: %s", __FUNCTION__, *etag); | |
76 | } | |
77 | } | |
78 | return nmemb; | |
79 | } | |
80 | ||
81 | static int curl_progress_func(void *clientp, double dltotal, double dlnow, double ultotal, double ulnow) | |
82 | { | |
83 | return a_background_testcancel(NULL); | |
84 | } | |
85 | ||
86 | static gchar *get_cookie_file(gboolean init) | |
87 | { | |
88 | static gchar *cookie_file = NULL; | |
89 | ||
90 | // Wipe any previous cookies set on startup (for some reason??) | |
91 | // Startup is single threaded so don't care about mutexes | |
92 | if (init) { | |
93 | static gchar *cookie_fn = "cookies.txt"; | |
94 | const gchar *viking_dir = a_get_viking_dir(); | |
95 | cookie_file = g_build_filename(viking_dir, cookie_fn, NULL); | |
96 | g_unlink(cookie_file); | |
97 | return NULL; | |
98 | } | |
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 | curl_download_user_agent = g_strdup_printf ("%s/%s %s", PACKAGE, VERSION, curl_version()); | |
109 | } | |
110 | ||
111 | /* This should to be called from main() to make sure thread safe */ | |
112 | void curl_download_uninit() | |
113 | { | |
114 | curl_global_cleanup(); | |
115 | } | |
116 | ||
117 | int curl_download_uri ( const char *uri, FILE *f, DownloadMapOptions *options, DownloadFileOptions *file_options, void *handle ) | |
118 | { | |
119 | CURL *curl; | |
120 | struct curl_slist *curl_send_headers = NULL; | |
121 | CURLcode res = CURLE_FAILED_INIT; | |
122 | const gchar *cookie_file; | |
123 | ||
124 | g_debug("%s: uri=%s", __PRETTY_FUNCTION__, uri); | |
125 | ||
126 | curl = handle ? handle : curl_easy_init (); | |
127 | if ( !curl ) { | |
128 | return DOWNLOAD_ERROR; | |
129 | } | |
130 | if (vik_verbose) | |
131 | curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 ); | |
132 | curl_easy_setopt ( curl, CURLOPT_NOSIGNAL, 1 ); // Yep, we're a multi-threaded program so don't let signals mess it up! | |
133 | if ( options != NULL && options->user_pass ) { | |
134 | curl_easy_setopt ( curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY ); | |
135 | curl_easy_setopt ( curl, CURLOPT_USERPWD, options->user_pass ); | |
136 | } | |
137 | curl_easy_setopt ( curl, CURLOPT_URL, uri ); | |
138 | curl_easy_setopt ( curl, CURLOPT_WRITEDATA, f ); | |
139 | curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func); | |
140 | curl_easy_setopt ( curl, CURLOPT_NOPROGRESS, 0 ); | |
141 | curl_easy_setopt ( curl, CURLOPT_PROGRESSDATA, NULL ); | |
142 | curl_easy_setopt ( curl, CURLOPT_PROGRESSFUNCTION, curl_progress_func); | |
143 | if (options != NULL) { | |
144 | if(options->referer != NULL) | |
145 | curl_easy_setopt ( curl, CURLOPT_REFERER, options->referer); | |
146 | if(options->follow_location != 0) { | |
147 | curl_easy_setopt ( curl, CURLOPT_FOLLOWLOCATION, 1); | |
148 | curl_easy_setopt ( curl, CURLOPT_MAXREDIRS, options->follow_location); | |
149 | } | |
150 | if (file_options != NULL) { | |
151 | if(options->check_file_server_time && file_options->time_condition != 0) { | |
152 | /* if file exists, check against server if file is recent enough */ | |
153 | curl_easy_setopt ( curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); | |
154 | curl_easy_setopt ( curl, CURLOPT_TIMEVALUE, file_options->time_condition); | |
155 | } | |
156 | if (options->use_etag) { | |
157 | if (file_options->etag != NULL) { | |
158 | /* add an header on the HTTP request */ | |
159 | char str[60]; | |
160 | g_snprintf(str, 60, "If-None-Match: %s", file_options->etag); | |
161 | curl_send_headers = curl_slist_append(curl_send_headers, str); | |
162 | curl_easy_setopt ( curl, CURLOPT_HTTPHEADER , curl_send_headers); | |
163 | } | |
164 | /* store the new etag from the server in an option value */ | |
165 | curl_easy_setopt ( curl, CURLOPT_WRITEHEADER, &(file_options->new_etag)); | |
166 | curl_easy_setopt ( curl, CURLOPT_HEADERFUNCTION, curl_get_etag_func); | |
167 | } | |
168 | } | |
169 | } | |
170 | curl_easy_setopt ( curl, CURLOPT_USERAGENT, curl_download_user_agent ); | |
171 | if ((cookie_file = get_cookie_file(FALSE)) != NULL) | |
172 | curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie_file); | |
173 | res = curl_easy_perform ( curl ); | |
174 | ||
175 | if (res == 0) { | |
176 | glong response; | |
177 | curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response); | |
178 | if (response == 304) { // 304 = Not Modified | |
179 | res = DOWNLOAD_NO_NEWER_FILE; | |
180 | } else if (response == 200 || // http: 200 = Ok | |
181 | response == 226) { // ftp: 226 = sucess | |
182 | gdouble size; | |
183 | /* verify if curl sends us any data - this is a workaround on using CURLOPT_TIMECONDITION | |
184 | when the server has a (incorrect) time earlier than the time on the file we already have */ | |
185 | curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &size); | |
186 | if (size == 0) | |
187 | res = DOWNLOAD_ERROR; | |
188 | else | |
189 | res = DOWNLOAD_NO_ERROR; | |
190 | } else { | |
191 | g_warning("%s: http response: %ld for uri %s\n", __FUNCTION__, response, uri); | |
192 | res = DOWNLOAD_ERROR; | |
193 | } | |
194 | } else { | |
195 | res = DOWNLOAD_ERROR; | |
196 | } | |
197 | if (!handle) | |
198 | curl_easy_cleanup ( curl ); | |
199 | if (curl_send_headers) { | |
200 | curl_slist_free_all(curl_send_headers); | |
201 | curl_send_headers = NULL; | |
202 | curl_easy_setopt ( curl, CURLOPT_HTTPHEADER , NULL); | |
203 | } | |
204 | return res; | |
205 | } | |
206 | ||
207 | int curl_download_get_url ( const char *hostname, const char *uri, FILE *f, DownloadMapOptions *options, gboolean ftp, DownloadFileOptions *file_options, void *handle ) | |
208 | { | |
209 | int ret; | |
210 | gchar *full = NULL; | |
211 | ||
212 | if ( strstr ( hostname, "://" ) != NULL ) | |
213 | /* Already full url */ | |
214 | full = (gchar *) hostname; | |
215 | else if ( strstr ( uri, "://" ) != NULL ) | |
216 | /* Already full url */ | |
217 | full = (gchar *) uri; | |
218 | else | |
219 | /* Compose the full url */ | |
220 | full = g_strdup_printf ( "%s://%s%s", (ftp?"ftp":"http"), hostname, uri ); | |
221 | ret = curl_download_uri ( full, f, options, file_options, handle ); | |
222 | /* Free newly allocated memory, but do not free uri */ | |
223 | if ( hostname != full && uri != full ) | |
224 | g_free ( full ); | |
225 | full = NULL; | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | void * curl_download_handle_init () | |
231 | { | |
232 | return curl_easy_init(); | |
233 | } | |
234 | ||
235 | void curl_download_handle_cleanup ( void *handle ) | |
236 | { | |
237 | curl_easy_cleanup(handle); | |
238 | } |