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/*
* Copyright (C) 2008 Martin Willi
* HSR 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_plugin.h"
#include <library.h>
#include <utils/debug.h>
#include "curl_fetcher.h"
#include <curl/curl.h>
typedef struct private_curl_plugin_t private_curl_plugin_t;
/**
* private data of curl_plugin
*/
struct private_curl_plugin_t {
/**
* public functions
*/
curl_plugin_t public;
/**
* Supported features, CURL protocols + 1
*/
plugin_feature_t *features;
/**
* Number of supported features
*/
int count;
};
/**
* Append a feature to supported feature list
*/
static void add_feature(private_curl_plugin_t *this, plugin_feature_t f)
{
this->features = realloc(this->features, ++this->count * sizeof(f));
this->features[this->count - 1] = f;
}
/**
* Try to add a feature, and the appropriate SSL dependencies
*/
static void add_feature_with_ssl(private_curl_plugin_t *this, const char *ssl,
char *proto, plugin_feature_t f)
{
/* http://curl.haxx.se/libcurl/c/libcurl-tutorial.html#Multi-threading */
if (strpfx(ssl, "OpenSSL") || strpfx(ssl, "LibreSSL"))
{
add_feature(this, f);
add_feature(this, PLUGIN_DEPENDS(CUSTOM, "openssl-threading"));
}
else if (strpfx(ssl, "GnuTLS"))
{
add_feature(this, f);
add_feature(this, PLUGIN_DEPENDS(CUSTOM, "gcrypt-threading"));
}
else if (strpfx(ssl, "NSS") ||
strpfx(ssl, "BoringSSL"))
{
add_feature(this, f);
}
else
{
DBG1(DBG_LIB, "curl SSL backend '%s' not supported, %s disabled",
ssl, proto);
}
}
/**
* Get supported protocols, build plugin feature set
*/
static bool query_protocols(private_curl_plugin_t *this)
{
struct {
/* protocol we are interested in, suffixed with "://" */
char *name;
/* require SSL library initialization? */
bool ssl;
} protos[] = {
{ "file://", FALSE, },
{ "http://", FALSE, },
{ "https://", TRUE, },
{ "ftp://", FALSE, },
};
curl_version_info_data *info;
char *name;
int i, j;
add_feature(this, PLUGIN_REGISTER(FETCHER, curl_fetcher_create));
info = curl_version_info(CURLVERSION_NOW);
for (i = 0; info->protocols[i]; i++)
{
for (j = 0; j < countof(protos); j++)
{
name = protos[j].name;
if (strlen(info->protocols[i]) == strlen(name) - strlen("://"))
{
if (strneq(info->protocols[i], name,
strlen(name) - strlen("://")))
{
if (protos[j].ssl)
{
add_feature_with_ssl(this, info->ssl_version, name,
PLUGIN_PROVIDE(FETCHER, name));
}
else
{
add_feature(this, PLUGIN_PROVIDE(FETCHER, name));
}
}
}
}
}
return this->count > 1;
}
METHOD(plugin_t, get_name, char*,
private_curl_plugin_t *this)
{
return "curl";
}
METHOD(plugin_t, get_features, int,
private_curl_plugin_t *this, plugin_feature_t *features[])
{
*features = this->features;
return this->count;
}
METHOD(plugin_t, destroy, void,
private_curl_plugin_t *this)
{
curl_global_cleanup();
free(this->features);
free(this);
}
/*
* see header file
*/
plugin_t *curl_plugin_create()
{
CURLcode res;
private_curl_plugin_t *this;
INIT(this,
.public = {
.plugin = {
.get_name = _get_name,
.get_features = _get_features,
.destroy = _destroy,
},
},
);
res = curl_global_init(CURL_GLOBAL_SSL);
if (res != CURLE_OK)
{
/* no SSL support? Try without */
res = curl_global_init(CURL_GLOBAL_NOTHING);
}
if (res != CURLE_OK)
{
DBG1(DBG_LIB, "global libcurl initializing failed: %s",
curl_easy_strerror(res));
destroy(this);
return NULL;
}
if (!query_protocols(this))
{
DBG1(DBG_LIB, "no usable CURL protocols found, curl disabled");
destroy(this);
return NULL;
}
return &this->public.plugin;
}
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