// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <dlfcn.h>
#include <iostream>
#include <string>
#include "chromecast/crash/libcurl_wrapper.h"
namespace chromecast {
LibcurlWrapper::LibcurlWrapper()
: init_ok_(false),
curl_lib_(nullptr),
last_curl_error_(""),
curl_(nullptr),
formpost_(nullptr),
lastptr_(nullptr),
headerlist_(nullptr) {}
LibcurlWrapper::~LibcurlWrapper() {
if (init_ok_) {
(*easy_cleanup_)(curl_);
dlclose(curl_lib_);
}
}
bool LibcurlWrapper::AddFile(const std::string& upload_file_path,
const std::string& basename) {
if (!CheckInit())
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,
long* http_status_code,
std::string* http_header_data,
std::string* http_response_data) {
if (!CheckInit())
return false;
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_);
return SendRequestInner(url, http_status_code, http_header_data,
http_response_data);
}
bool LibcurlWrapper::Init() {
// First check to see if libcurl was statically linked:
curl_lib_ = dlopen(nullptr, RTLD_NOW);
if (curl_lib_ && (!dlsym(curl_lib_, "curl_easy_init") ||
!dlsym(curl_lib_, "curl_easy_setopt"))) {
// Not statically linked, try again below.
dlerror(); // Clear dlerror before attempting to open libraries.
dlclose(curl_lib_);
curl_lib_ = nullptr;
}
if (!curl_lib_) {
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 false;
}
if (!SetFunctionPointers()) {
std::cout << "Could not find function pointers";
return false;
}
curl_ = (*easy_init_)();
last_curl_error_ = "No Error";
if (!curl_) {
dlclose(curl_lib_);
std::cout << "Curl initialization failed";
return false;
}
init_ok_ = true;
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(easy_getinfo_, "curl_easy_getinfo",
CURLcode(*)(CURL*, CURLINFO info, ...));
SET_AND_CHECK_FUNCTION_POINTER(easy_reset_, "curl_easy_reset",
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;
}
bool LibcurlWrapper::SendRequestInner(const std::string& url,
long* http_status_code,
std::string* http_header_data,
std::string* http_response_data) {
std::string url_copy(url);
(*easy_setopt_)(curl_, CURLOPT_URL, url_copy.c_str());
// Use the enum when available in the header file.
(*easy_setopt_)(curl_, CURLOPT_SSLVERSION, 6 /*CURL_SSLVERSION_TLSv1_2*/);
// Disable 100-continue header.
char buf[] = "Expect:";
headerlist_ = (*slist_append_)(headerlist_, buf);
(*easy_setopt_)(curl_, CURLOPT_HTTPHEADER, headerlist_);
if (http_response_data != nullptr) {
http_response_data->clear();
(*easy_setopt_)(curl_, CURLOPT_WRITEFUNCTION, WriteCallback);
(*easy_setopt_)(curl_, CURLOPT_WRITEDATA,
reinterpret_cast<void*>(http_response_data));
}
if (http_header_data != nullptr) {
http_header_data->clear();
(*easy_setopt_)(curl_, CURLOPT_HEADERFUNCTION, WriteCallback);
(*easy_setopt_)(curl_, CURLOPT_HEADERDATA,
reinterpret_cast<void*>(http_header_data));
}
CURLcode err_code = CURLE_OK;
err_code = (*easy_perform_)(curl_);
easy_strerror_ = reinterpret_cast<const char* (*)(CURLcode)>(
dlsym(curl_lib_, "curl_easy_strerror"));
if (http_status_code != nullptr) {
(*easy_getinfo_)(curl_, CURLINFO_RESPONSE_CODE, http_status_code);
}
#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
Reset();
return err_code == CURLE_OK;
}
void LibcurlWrapper::Reset() {
if (headerlist_ != nullptr) {
(*slist_free_all_)(headerlist_);
headerlist_ = nullptr;
}
if (formpost_ != nullptr) {
(*formfree_)(formpost_);
formpost_ = nullptr;
}
(*easy_reset_)(curl_);
}
bool LibcurlWrapper::CheckInit() {
if (!init_ok_) {
std::cout << "LibcurlWrapper: You must call Init(), and have it return "
"'true' before invoking any other methods.\n";
return false;
}
return true;
}
} // namespace chromecast
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