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// Copyright (c) 2009, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <dlfcn.h>
#include <iostream>
#include <string>
#include "common/linux/libcurl_wrapper.h"
using std::string;
namespace google_breakpad {
LibcurlWrapper::LibcurlWrapper()
: init_ok_(false),
formpost_(NULL),
lastptr_(NULL),
headerlist_(NULL) {
curl_lib_ = dlopen("libcurl.so", RTLD_NOW);
if (!curl_lib_) {
curl_lib_ = dlopen("libcurl.so.4", RTLD_NOW);
}
if (!curl_lib_) {
curl_lib_ = dlopen("libcurl.so.3", RTLD_NOW);
}
if (!curl_lib_) {
std::cout << "Could not find libcurl via dlopen";
return;
}
std::cout << "LibcurlWrapper init succeeded";
init_ok_ = true;
return;
}
bool LibcurlWrapper::SetProxy(const std::string& proxy_host,
const std::string& proxy_userpwd) {
if (!init_ok_) {
return false;
}
// Set proxy information if necessary.
if (!proxy_host.empty()) {
(*easy_setopt_)(curl_, CURLOPT_PROXY, proxy_host.c_str());
} else {
std::cout << "SetProxy called with empty proxy host.";
return false;
}
if (!proxy_userpwd.empty()) {
(*easy_setopt_)(curl_, CURLOPT_PROXYUSERPWD, proxy_userpwd.c_str());
} else {
std::cout << "SetProxy called with empty proxy username/password.";
return false;
}
std::cout << "Set proxy host to " << proxy_host;
return true;
}
bool LibcurlWrapper::AddFile(const std::string& upload_file_path,
const std::string& basename) {
if (!init_ok_) {
return false;
}
std::cout << "Adding " << upload_file_path << " to form upload.";
// Add form file.
(*formadd_)(&formpost_, &lastptr_,
CURLFORM_COPYNAME, basename.c_str(),
CURLFORM_FILE, upload_file_path.c_str(),
CURLFORM_END);
return true;
}
// Callback to get the response data from server.
static size_t WriteCallback(void *ptr, size_t size,
size_t nmemb, void *userp) {
if (!userp)
return 0;
std::string *response = reinterpret_cast<std::string *>(userp);
size_t real_size = size * nmemb;
response->append(reinterpret_cast<char *>(ptr), real_size);
return real_size;
}
bool LibcurlWrapper::SendRequest(const std::string& url,
const std::map<std::string, std::string>& parameters,
std::string* server_response) {
(*easy_setopt_)(curl_, CURLOPT_URL, url.c_str());
std::map<std::string, std::string>::const_iterator iter = parameters.begin();
for (; iter != parameters.end(); ++iter)
(*formadd_)(&formpost_, &lastptr_,
CURLFORM_COPYNAME, iter->first.c_str(),
CURLFORM_COPYCONTENTS, iter->second.c_str(),
CURLFORM_END);
(*easy_setopt_)(curl_, CURLOPT_HTTPPOST, formpost_);
if (server_response != NULL) {
(*easy_setopt_)(curl_, CURLOPT_WRITEFUNCTION, WriteCallback);
(*easy_setopt_)(curl_, CURLOPT_WRITEDATA,
reinterpret_cast<void *>(server_response));
}
CURLcode err_code = CURLE_OK;
err_code = (*easy_perform_)(curl_);
easy_strerror_ = reinterpret_cast<const char* (*)(CURLcode)>
(dlsym(curl_lib_, "curl_easy_strerror"));
#ifndef NDEBUG
if (err_code != CURLE_OK)
fprintf(stderr, "Failed to send http request to %s, error: %s\n",
url.c_str(),
(*easy_strerror_)(err_code));
#endif
if (headerlist_ != NULL) {
(*slist_free_all_)(headerlist_);
}
(*easy_cleanup_)(curl_);
if (formpost_ != NULL) {
(*formfree_)(formpost_);
}
return err_code == CURLE_OK;
}
bool LibcurlWrapper::Init() {
if (!init_ok_) {
std::cout << "Init_OK was not true in LibcurlWrapper::Init(), check earlier log messages";
return false;
}
if (!SetFunctionPointers()) {
std::cout << "Could not find function pointers";
init_ok_ = false;
return false;
}
curl_ = (*easy_init_)();
last_curl_error_ = "No Error";
if (!curl_) {
dlclose(curl_lib_);
std::cout << "Curl initialization failed";
return false;
}
// Disable 100-continue header.
char buf[] = "Expect:";
headerlist_ = (*slist_append_)(headerlist_, buf);
(*easy_setopt_)(curl_, CURLOPT_HTTPHEADER, headerlist_);
return true;
}
#define SET_AND_CHECK_FUNCTION_POINTER(var, function_name, type) \
var = reinterpret_cast<type>(dlsym(curl_lib_, function_name)); \
if (!var) { \
std::cout << "Could not find libcurl function " << function_name; \
init_ok_ = false; \
return false; \
}
bool LibcurlWrapper::SetFunctionPointers() {
SET_AND_CHECK_FUNCTION_POINTER(easy_init_,
"curl_easy_init",
CURL*(*)());
SET_AND_CHECK_FUNCTION_POINTER(easy_setopt_,
"curl_easy_setopt",
CURLcode(*)(CURL*, CURLoption, ...));
SET_AND_CHECK_FUNCTION_POINTER(formadd_, "curl_formadd",
CURLFORMcode(*)(curl_httppost**, curl_httppost**, ...));
SET_AND_CHECK_FUNCTION_POINTER(slist_append_, "curl_slist_append",
curl_slist*(*)(curl_slist*, const char*));
SET_AND_CHECK_FUNCTION_POINTER(easy_perform_,
"curl_easy_perform",
CURLcode(*)(CURL*));
SET_AND_CHECK_FUNCTION_POINTER(easy_cleanup_,
"curl_easy_cleanup",
void(*)(CURL*));
SET_AND_CHECK_FUNCTION_POINTER(slist_free_all_,
"curl_slist_free_all",
void(*)(curl_slist*));
SET_AND_CHECK_FUNCTION_POINTER(formfree_,
"curl_formfree",
void(*)(curl_httppost*));
return true;
}
}
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