X-Git-Url: https://git.street.me.uk/andy/viking.git/blobdiff_plain/8c0604067586d37324e75ee2939038ecde370fa1..bd5e571ac6338d3fe04102d73e3328678eb964bd:/src/curl_download.c diff --git a/src/curl_download.c b/src/curl_download.c index ed822e50..9db48ba0 100644 --- a/src/curl_download.c +++ b/src/curl_download.c @@ -1,7 +1,10 @@ /* * viking -- GPS Data and Topo Analyzer, Explorer, and Manager * - * Copyright (C) 2003-2005, Evan Battaglia + * Copyright (C) 2007, Guilhem Bonnefille + * Copyright (C) 2007, Quy Tonthat + * Copyright (C) 2009-2010, Jocelyn Jaubert + * Copyright (C) 2010, Sven Wegener * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -25,16 +28,58 @@ #include +#ifdef HAVE_UNISTD_H +#include +#endif + #include #include #include +#include #include #include +#include "background.h" #include "file.h" +#include "globals.h" #include "curl_download.h" +gchar *curl_download_user_agent = NULL; + +/* + * Even if writing to FILE* is supported by libcurl by default, + * it seems that it is non-portable (win32 DLL specific). + * + * So, we provide our own trivial CURLOPT_WRITEFUNCTION. + */ +static size_t curl_write_func(void *ptr, size_t size, size_t nmemb, FILE *stream) +{ + return fwrite(ptr, size, nmemb, stream); +} + +static size_t curl_get_etag_func(void *ptr, size_t size, size_t nmemb, gchar **stream) +{ +#define ETAG_KEYWORD "ETag: " +#define ETAG_LEN (sizeof(ETAG_KEYWORD)-1) + size_t len = size*nmemb; + char *str = g_strstr_len(ptr, len, ETAG_KEYWORD); + if (str) { + char *etag_str = str + ETAG_LEN; + char *end_str = g_strstr_len(etag_str, len - ETAG_LEN, "\r\n"); + if (etag_str && end_str) { + *stream = g_strndup(etag_str, end_str - etag_str); + g_debug("%s: ETAG found: %s", __FUNCTION__, *stream); + } + } + return nmemb; +} + +static int curl_progress_func(void *clientp, double dltotal, double dlnow, double ultotal, double ulnow) +{ + return a_background_testcancel(NULL); +} + static gchar *get_cookie_file(gboolean init) { static gchar *cookie_file = NULL; @@ -53,11 +98,20 @@ static gchar *get_cookie_file(gboolean init) g_mutex_lock(mutex); if (g_file_test(cookie_file, G_FILE_TEST_EXISTS) == FALSE) { /* file not there */ - FILE * out_file = g_fopen("/dev/null", "w"); + gchar * name_tmp = NULL; + FILE * out_file = tmpfile(); + if (out_file == NULL) { + // Something wrong with previous call (unsuported?) + name_tmp = g_strdup_printf("%s.tmp", cookie_file); + out_file = g_fopen(name_tmp, "w+b"); + } CURLcode res; CURL *curl = curl_easy_init(); + if (vik_verbose) + curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 ); curl_easy_setopt(curl, CURLOPT_URL, "http://maps.google.com/"); /* google.com sets "PREF" cookie */ - curl_easy_setopt ( curl, CURLOPT_FILE, out_file ); + curl_easy_setopt ( curl, CURLOPT_WRITEDATA, out_file ); + curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func); curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookie_file); res = curl_easy_perform(curl); if (res != CURLE_OK) { @@ -68,6 +122,11 @@ static gchar *get_cookie_file(gboolean init) curl_easy_cleanup(curl); fclose(out_file); out_file = NULL; + if (name_tmp != NULL) { + g_remove(name_tmp); + g_free(name_tmp); + name_tmp = NULL; + } } g_mutex_unlock(mutex); @@ -79,46 +138,114 @@ void curl_download_init() { curl_global_init(CURL_GLOBAL_ALL); get_cookie_file(TRUE); + curl_download_user_agent = g_strdup_printf ("%s/%s %s", PACKAGE, VERSION, curl_version()); } -int curl_download_uri ( const char *uri, FILE *f, DownloadOptions *options ) +int curl_download_uri ( const char *uri, FILE *f, DownloadMapOptions *options, DownloadFileOptions *file_options, void *handle ) { CURL *curl; + struct curl_slist *curl_send_headers = NULL; CURLcode res = CURLE_FAILED_INIT; const gchar *cookie_file; - curl = curl_easy_init (); - if ( curl ) - { - curl_easy_setopt ( curl, CURLOPT_URL, uri ); - curl_easy_setopt ( curl, CURLOPT_FILE, f ); - if (options != NULL) { - if(options->referer != NULL) - curl_easy_setopt ( curl, CURLOPT_REFERER, options->referer); - if(options->follow_location != 0) { - curl_easy_setopt ( curl, CURLOPT_FOLLOWLOCATION, 1); - curl_easy_setopt ( curl, CURLOPT_MAXREDIRS, options->follow_location); + g_debug("%s: uri=%s", __PRETTY_FUNCTION__, uri); + + curl = handle ? handle : curl_easy_init (); + if ( !curl ) { + return DOWNLOAD_ERROR; + } + if (vik_verbose) + curl_easy_setopt ( curl, CURLOPT_VERBOSE, 1 ); + curl_easy_setopt ( curl, CURLOPT_URL, uri ); + curl_easy_setopt ( curl, CURLOPT_WRITEDATA, f ); + curl_easy_setopt ( curl, CURLOPT_WRITEFUNCTION, curl_write_func); + curl_easy_setopt ( curl, CURLOPT_NOPROGRESS, 0 ); + curl_easy_setopt ( curl, CURLOPT_PROGRESSDATA, NULL ); + curl_easy_setopt ( curl, CURLOPT_PROGRESSFUNCTION, curl_progress_func); + if (options != NULL) { + if(options->referer != NULL) + curl_easy_setopt ( curl, CURLOPT_REFERER, options->referer); + if(options->follow_location != 0) { + curl_easy_setopt ( curl, CURLOPT_FOLLOWLOCATION, 1); + curl_easy_setopt ( curl, CURLOPT_MAXREDIRS, options->follow_location); + } + if (file_options != NULL) { + if(options->check_file_server_time && file_options->time_condition != 0) { + /* if file exists, check against server if file is recent enough */ + curl_easy_setopt ( curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE); + curl_easy_setopt ( curl, CURLOPT_TIMEVALUE, file_options->time_condition); + } + if (options->use_etag) { + if (file_options->etag != NULL) { + /* add an header on the HTTP request */ + char str[60]; + g_snprintf(str, 60, "If-None-Match: %s", file_options->etag); + curl_send_headers = curl_slist_append(curl_send_headers, str); + curl_easy_setopt ( curl, CURLOPT_HTTPHEADER , curl_send_headers); } + /* store the new etag from the server in an option value */ + curl_easy_setopt ( curl, CURLOPT_WRITEHEADER, &(file_options->new_etag)); + curl_easy_setopt ( curl, CURLOPT_HEADERFUNCTION, curl_get_etag_func); } - curl_easy_setopt ( curl, CURLOPT_USERAGENT, PACKAGE "/" VERSION " libcurl/7.15.4" ); - if ((cookie_file = get_cookie_file(FALSE)) != NULL) - curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie_file); - res = curl_easy_perform ( curl ); - curl_easy_cleanup ( curl ); } - return(res); + } + curl_easy_setopt ( curl, CURLOPT_USERAGENT, curl_download_user_agent ); + if ((cookie_file = get_cookie_file(FALSE)) != NULL) + curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookie_file); + res = curl_easy_perform ( curl ); + + if (res == 0) { + glong response; + curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response); + if (response == 304) { // 304 = Not Modified + res = DOWNLOAD_NO_NEWER_FILE; + } else if (response == 200 || // http: 200 = Ok + response == 226) { // ftp: 226 = sucess + gdouble size; + /* verify if curl sends us any data - this is a workaround on using CURLOPT_TIMECONDITION + when the server has a (incorrect) time earlier than the time on the file we already have */ + curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &size); + if (size == 0) + res = DOWNLOAD_ERROR; + else + res = DOWNLOAD_NO_ERROR; + } else { + g_warning("%s: http response: %ld for uri %s (time_condition = %ld)\n", __FUNCTION__, response, uri, file_options->time_condition); + res = DOWNLOAD_ERROR; + } + } else { + res = DOWNLOAD_ERROR; + } + if (!handle) + curl_easy_cleanup ( curl ); + if (curl_send_headers) { + curl_slist_free_all(curl_send_headers); + curl_send_headers = NULL; + curl_easy_setopt ( curl, CURLOPT_HTTPHEADER , NULL); + } + return res; } -int curl_download_get_url ( const char *hostname, const char *uri, FILE *f, DownloadOptions *options, gboolean ftp ) +int curl_download_get_url ( const char *hostname, const char *uri, FILE *f, DownloadMapOptions *options, gboolean ftp, DownloadFileOptions *file_options, void *handle ) { int ret; gchar *full = NULL; /* Compose the full url */ full = g_strdup_printf ( "%s://%s%s", (ftp?"ftp":"http"), hostname, uri ); - ret = curl_download_uri ( full, f, options ); + ret = curl_download_uri ( full, f, options, file_options, handle ); g_free ( full ); full = NULL; - return (ret ? -2 : 0); /* -2 HTTP error */ + return ret; +} + +void * curl_download_handle_init () +{ + return curl_easy_init(); +} + +void curl_download_handle_cleanup ( void *handle ) +{ + curl_easy_cleanup(handle); }