提升野兽样本发送帖子
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【中文标题】提升野兽样本发送帖子【英文标题】:boost beast sample to send post 【发布时间】:2019-05-22 21:07:39 【问题描述】:我收到以下回复,但我不知道如何识别问题。 Fiddler 没有捕获任何东西,所以我相信请求没有被发送出去。
HTTP/1.1 411 Length Required
Content-Type: text/html; charset=us-ascii
Server: Microsoft-HTTPAPI/2.0
Date: Wed, 22 May 2019 11:15:04 GMT
Connection: close
Content-Length: 344
我尝试按照我找到的其他示例进行操作,但似乎设置正文不再编译。
// error C2679: binary '=': no operator found which takes a right-hand operand of type 'const char *' (or there is no acceptable conversion)
req_.body() = "test";
我正在使用针对 x64 编译的 Visual Studio 2017,并将 Boost 链接为 DLL。我从野兽样本开始,让“GET”完美地为我工作。我在让野兽客户端的“POST”工作时遇到问题
`
//
// Example: HTTP client, asynchronous
//
// Quickly add boost DLLs with: https://www.nuget.org/packages/boost-vc141/
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/strand.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/lexical_cast.hpp>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <memory>
#include <string>
namespace beast = boost::beast; // from <boost/beast.hpp>
namespace http = beast::http; // from <boost/beast/http.hpp>
namespace net = boost::asio; // from <boost/asio.hpp>
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
// Report a failure
void
fail(beast::error_code ec, char const* what)
std::cerr << what << ": " << ec.message() << "\n";
// Performs an HTTP GET and prints the response
class session : public std::enable_shared_from_this<session>
tcp::resolver resolver_;
beast::tcp_stream stream_;
beast::flat_buffer buffer_; // (Must persist between reads)
http::request<http::dynamic_body> req_;
http::response<http::string_body> res_;
public:
// Objects are constructed with a strand to
// ensure that handlers do not execute concurrently.
explicit
session(net::io_context& ioc)
: resolver_(net::make_strand(ioc))
, stream_(net::make_strand(ioc))
// Start the asynchronous operation
void
run(
char const* host,
char const* port,
char const* target,
char const* body,
int version)
// Set up an HTTP POST request message
req_.version(version);
req_.method(http::verb::post);
req_.target(target);
req_.set(http::field::host, host);
req_.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
req_.set(http::field::content_length, boost::lexical_cast<std::string>(strlen(body)));
req_.set(http::field::body, body);
req_.prepare_payload();
// following line doesn't compile:
// error C2679: binary '=': no operator found which takes a right-hand operand of type 'const char *' (or there is no acceptable conversion)
//req_.body() = body;
// Look up the domain name
resolver_.async_resolve(
host,
port,
beast::bind_front_handler(
&session::on_resolve,
shared_from_this()));
void
on_resolve(
beast::error_code ec,
tcp::resolver::results_type results)
if (ec)
return fail(ec, "resolve");
// Set a timeout on the operation
stream_.expires_after(std::chrono::seconds(30));
// Make the connection on the IP address we get from a lookup
stream_.async_connect(
results,
beast::bind_front_handler(
&session::on_connect,
shared_from_this()));
void
on_connect(beast::error_code ec, tcp::resolver::results_type::endpoint_type)
if (ec)
return fail(ec, "connect");
// Set a timeout on the operation
stream_.expires_after(std::chrono::seconds(30));
// Send the HTTP request to the remote host
http::async_write(stream_, req_,
beast::bind_front_handler(
&session::on_write,
shared_from_this()));
void
on_write(
beast::error_code ec,
std::size_t bytes_transferred)
boost::ignore_unused(bytes_transferred);
if (ec)
return fail(ec, "write");
// Receive the HTTP response
http::async_read(stream_, buffer_, res_,
beast::bind_front_handler(
&session::on_read,
shared_from_this()));
void
on_read(
beast::error_code ec,
std::size_t bytes_transferred)
boost::ignore_unused(bytes_transferred);
if (ec)
return fail(ec, "read");
// Write the message to standard out
std::cout << res_ << std::endl;
// Gracefully close the socket
stream_.socket().shutdown(tcp::socket::shutdown_both, ec);
// not_connected happens sometimes so don't bother reporting it.
if (ec && ec != beast::errc::not_connected)
return fail(ec, "shutdown");
// If we get here then the connection is closed gracefully
;
std::string create_body()
boost::property_tree::ptree tree;
tree.put("foo", "bar");
std::basic_stringstream<char> jsonStream;
boost::property_tree::json_parser::write_json(jsonStream, tree, false);
return jsonStream.str();
int main(int argc, char** argv)
// Check command line arguments.
if (argc != 4 && argc != 5)
std::cerr <<
"Usage: http-client-async <host> <port> <target> [<HTTP version: 1.0 or 1.1(default)>]\n" <<
"Example:\n" <<
" http-client-async www.example.com 80 /\n" <<
" http-client-async www.example.com 80 / 1.0\n";
return EXIT_FAILURE;
auto const host = argv[1];
auto const port = argv[2];
auto const target = argv[3];
int version = argc == 5 && !std::strcmp("1.0", argv[4]) ? 10 : 11;
// The io_context is required for all I/O
net::io_context ioc;
// Launch the asynchronous operation
std::make_shared<session>(ioc)->run(host, port, target, create_body().c_str(), version);
// Run the I/O service. The call will return when
// the get operation is complete.
ioc.run();
return EXIT_SUCCESS;
`
-
我如何查看要发送的数据包生成的 Beast 是什么?
如何修复尝试设置正文的编译错误,如其他帖子所示:
request.body() = "bodytext";
谁能提供一个使用 post 的示例 Beast 客户端和服务器?
【问题讨论】:
【参考方案1】:在操作符= 中,正文不可用,因为您的请求是使用模板 http::dynamic_body: 声明的:
http::request<http::dynamic_body> req_;
将您的模板参数更改为 http::string_body 并且 operator= 将起作用
http::response<http::string_body> req_;
可以编译代码
req_.body() = body;
我在 CentOS7 下测试过。
【讨论】:
请让我知道如何在写入套接字usign ostraitnstream之前打印请求。以上是关于提升野兽样本发送帖子的主要内容,如果未能解决你的问题,请参考以下文章
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