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/*
* Copyright (C) 2008 Martin Willi
* Copyright (C) 2007 Andreas Steffen
* Hochschule fuer Technik Rapperswil
*
* 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 the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <curl/curl.h>
#include <library.h>
#include <debug.h>
#include "curl_fetcher.h"
#define DEFAULT_TIMEOUT 10
typedef struct private_curl_fetcher_t private_curl_fetcher_t;
/**
* private data of a curl_fetcher_t object.
*/
struct private_curl_fetcher_t {
/**
* Public data
*/
curl_fetcher_t public;
/**
* CURL handle
*/
CURL* curl;
/**
* Optional HTTP headers
*/
struct curl_slist *headers;
/**
* Callback function
*/
fetcher_callback_t cb;
};
/**
* Data to pass to curl callback
*/
typedef struct {
fetcher_callback_t cb;
void *user;
} cb_data_t;
/**
* Curl callback function, invokes fetcher_callback_t function
*/
static size_t curl_cb(void *ptr, size_t size, size_t nmemb, cb_data_t *data)
{
size_t realsize = size * nmemb;
if (data->cb(data->user, chunk_create(ptr, realsize)))
{
return realsize;
}
return 0;
}
METHOD(fetcher_t, fetch, status_t,
private_curl_fetcher_t *this, char *uri, void *userdata)
{
char error[CURL_ERROR_SIZE];
status_t status;
cb_data_t data = {
.cb = this->cb,
.user = userdata,
};
if (this->cb == fetcher_default_callback)
{
*(chunk_t*)userdata = chunk_empty;
}
if (curl_easy_setopt(this->curl, CURLOPT_URL, uri) != CURLE_OK)
{ /* URL type not supported by curl */
return NOT_SUPPORTED;
}
curl_easy_setopt(this->curl, CURLOPT_ERRORBUFFER, error);
curl_easy_setopt(this->curl, CURLOPT_FAILONERROR, TRUE);
curl_easy_setopt(this->curl, CURLOPT_NOSIGNAL, TRUE);
curl_easy_setopt(this->curl, CURLOPT_CONNECTTIMEOUT, DEFAULT_TIMEOUT);
curl_easy_setopt(this->curl, CURLOPT_WRITEFUNCTION, (void*)curl_cb);
curl_easy_setopt(this->curl, CURLOPT_WRITEDATA, &data);
if (this->headers)
{
curl_easy_setopt(this->curl, CURLOPT_HTTPHEADER, this->headers);
}
DBG2(DBG_LIB, " sending http request to '%s'...", uri);
switch (curl_easy_perform(this->curl))
{
case CURLE_UNSUPPORTED_PROTOCOL:
status = NOT_SUPPORTED;
break;
case CURLE_OK:
status = SUCCESS;
break;
default:
DBG1(DBG_LIB, "libcurl http request failed: %s", error);
status = FAILED;
break;
}
return status;
}
METHOD(fetcher_t, set_option, bool,
private_curl_fetcher_t *this, fetcher_option_t option, ...)
{
bool supported = TRUE;
va_list args;
va_start(args, option);
switch (option)
{
case FETCH_REQUEST_DATA:
{
chunk_t data = va_arg(args, chunk_t);
curl_easy_setopt(this->curl, CURLOPT_POSTFIELDS, (char*)data.ptr);
curl_easy_setopt(this->curl, CURLOPT_POSTFIELDSIZE, data.len);
break;
}
case FETCH_REQUEST_TYPE:
{
char header[BUF_LEN];
char *request_type = va_arg(args, char*);
snprintf(header, BUF_LEN, "Content-Type: %s", request_type);
this->headers = curl_slist_append(this->headers, header);
break;
}
case FETCH_REQUEST_HEADER:
{
char *header = va_arg(args, char*);
this->headers = curl_slist_append(this->headers, header);
break;
}
case FETCH_HTTP_VERSION_1_0:
{
curl_easy_setopt(this->curl, CURLOPT_HTTP_VERSION,
CURL_HTTP_VERSION_1_0);
break;
}
case FETCH_TIMEOUT:
{
curl_easy_setopt(this->curl, CURLOPT_CONNECTTIMEOUT,
va_arg(args, u_int));
break;
}
case FETCH_CALLBACK:
{
this->cb = va_arg(args, fetcher_callback_t);
break;
}
default:
supported = FALSE;
break;
}
va_end(args);
return supported;
}
METHOD(fetcher_t, destroy, void,
private_curl_fetcher_t *this)
{
curl_slist_free_all(this->headers);
curl_easy_cleanup(this->curl);
free(this);
}
/*
* Described in header.
*/
curl_fetcher_t *curl_fetcher_create()
{
private_curl_fetcher_t *this;
INIT(this,
.public = {
.interface = {
.fetch = _fetch,
.set_option = _set_option,
.destroy = _destroy,
},
},
.curl = curl_easy_init(),
.cb = fetcher_default_callback,
);
if (!this->curl)
{
free(this);
return NULL;
}
return &this->public;
}
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