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/*
* Sketchy HTTP client
* (C) 2013,2016 Jack Lloyd
* 2017 René Korthaus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/http_util.h>
#include <botan/parsing.h>
#include <botan/hex.h>
#include <botan/internal/os_utils.h>
#include <botan/internal/socket.h>
#include <botan/internal/stl_util.h>
#include <sstream>
namespace Botan {
namespace HTTP {
namespace {
/*
* Connect to a host, write some bytes, then read until the server
* closes the socket.
*/
std::string http_transact(const std::string& hostname,
const std::string& message,
std::chrono::milliseconds timeout)
{
std::unique_ptr<OS::Socket> socket;
const std::chrono::system_clock::time_point start_time = std::chrono::system_clock::now();
try
{
socket = OS::open_socket(hostname, "http", timeout);
if(!socket)
throw Exception("No socket support enabled in build");
}
catch(std::exception& e)
{
throw HTTP_Error("HTTP connection to " + hostname + " failed: " + e.what());
}
// Blocks until entire message has been written
socket->write(cast_char_ptr_to_uint8(message.data()),
message.size());
if(std::chrono::system_clock::now() - start_time > timeout)
throw HTTP_Error("Timeout during writing message body");
std::ostringstream oss;
std::vector<uint8_t> buf(BOTAN_DEFAULT_BUFFER_SIZE);
while(true)
{
const size_t got = socket->read(buf.data(), buf.size());
if(got == 0) // EOF
break;
if(std::chrono::system_clock::now() - start_time > timeout)
throw HTTP_Error("Timeout while reading message body");
oss.write(cast_uint8_ptr_to_char(buf.data()),
static_cast<std::streamsize>(got));
}
return oss.str();
}
}
std::string url_encode(const std::string& in)
{
std::ostringstream out;
for(auto c : in)
{
if(c >= 'A' && c <= 'Z')
out << c;
else if(c >= 'a' && c <= 'z')
out << c;
else if(c >= '0' && c <= '9')
out << c;
else if(c == '-' || c == '_' || c == '.' || c == '~')
out << c;
else
out << '%' << hex_encode(cast_char_ptr_to_uint8(&c), 1);
}
return out.str();
}
std::ostream& operator<<(std::ostream& o, const Response& resp)
{
o << "HTTP " << resp.status_code() << " " << resp.status_message() << "\n";
for(auto h : resp.headers())
o << "Header '" << h.first << "' = '" << h.second << "'\n";
o << "Body " << std::to_string(resp.body().size()) << " bytes:\n";
o.write(cast_uint8_ptr_to_char(resp.body().data()), resp.body().size());
return o;
}
Response http_sync(http_exch_fn http_transact,
const std::string& verb,
const std::string& url,
const std::string& content_type,
const std::vector<uint8_t>& body,
size_t allowable_redirects)
{
if(url.empty())
throw HTTP_Error("URL empty");
const auto protocol_host_sep = url.find("://");
if(protocol_host_sep == std::string::npos)
throw HTTP_Error("Invalid URL '" + url + "'");
const auto host_loc_sep = url.find('/', protocol_host_sep + 3);
std::string hostname, loc;
if(host_loc_sep == std::string::npos)
{
hostname = url.substr(protocol_host_sep + 3, std::string::npos);
loc = "/";
}
else
{
hostname = url.substr(protocol_host_sep + 3, host_loc_sep-protocol_host_sep-3);
loc = url.substr(host_loc_sep, std::string::npos);
}
std::ostringstream outbuf;
outbuf << verb << " " << loc << " HTTP/1.0\r\n";
outbuf << "Host: " << hostname << "\r\n";
if(verb == "GET")
{
outbuf << "Accept: */*\r\n";
outbuf << "Cache-Control: no-cache\r\n";
}
else if(verb == "POST")
outbuf << "Content-Length: " << body.size() << "\r\n";
if(!content_type.empty())
outbuf << "Content-Type: " << content_type << "\r\n";
outbuf << "Connection: close\r\n\r\n";
outbuf.write(cast_uint8_ptr_to_char(body.data()), body.size());
std::istringstream io(http_transact(hostname, outbuf.str()));
std::string line1;
std::getline(io, line1);
if(!io || line1.empty())
throw HTTP_Error("No response");
std::stringstream response_stream(line1);
std::string http_version;
unsigned int status_code;
std::string status_message;
response_stream >> http_version >> status_code;
std::getline(response_stream, status_message);
if(!response_stream || http_version.substr(0,5) != "HTTP/")
throw HTTP_Error("Not an HTTP response");
std::map<std::string, std::string> headers;
std::string header_line;
while (std::getline(io, header_line) && header_line != "\r")
{
auto sep = header_line.find(": ");
if(sep == std::string::npos || sep > header_line.size() - 2)
throw HTTP_Error("Invalid HTTP header " + header_line);
const std::string key = header_line.substr(0, sep);
if(sep + 2 < header_line.size() - 1)
{
const std::string val = header_line.substr(sep + 2, (header_line.size() - 1) - (sep + 2));
headers[key] = val;
}
}
if(status_code == 301 && headers.count("Location"))
{
if(allowable_redirects == 0)
throw HTTP_Error("HTTP redirection count exceeded");
return GET_sync(headers["Location"], allowable_redirects - 1);
}
std::vector<uint8_t> resp_body;
std::vector<uint8_t> buf(4096);
while(io.good())
{
io.read(cast_uint8_ptr_to_char(buf.data()), buf.size());
resp_body.insert(resp_body.end(), buf.data(), &buf[io.gcount()]);
}
const std::string header_size = search_map(headers, std::string("Content-Length"));
if(!header_size.empty())
{
if(resp_body.size() != to_u32bit(header_size))
throw HTTP_Error("Content-Length disagreement, header says " +
header_size + " got " + std::to_string(resp_body.size()));
}
return Response(status_code, status_message, resp_body, headers);
}
Response http_sync(const std::string& verb,
const std::string& url,
const std::string& content_type,
const std::vector<uint8_t>& body,
size_t allowable_redirects,
std::chrono::milliseconds timeout)
{
auto transact_with_timeout =
[timeout](const std::string& hostname, const std::string& service)
{
return http_transact(hostname, service, timeout);
};
return http_sync(
transact_with_timeout,
verb,
url,
content_type,
body,
allowable_redirects);
}
Response GET_sync(const std::string& url,
size_t allowable_redirects,
std::chrono::milliseconds timeout)
{
return http_sync("GET", url, "", std::vector<uint8_t>(), allowable_redirects, timeout);
}
Response POST_sync(const std::string& url,
const std::string& content_type,
const std::vector<uint8_t>& body,
size_t allowable_redirects,
std::chrono::milliseconds timeout)
{
return http_sync("POST", url, content_type, body, allowable_redirects, timeout);
}
}
}
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