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/*
* (C) 2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "apps.h"
#if defined(BOTAN_HAS_TLS)
#include <botan/tls_server.h>
#include <botan/hex.h>
#include <botan/rsa.h>
#include <botan/dsa.h>
#include <botan/x509self.h>
#include <botan/secqueue.h>
#include "credentials.h"
using namespace Botan;
using namespace std::placeholders;
#include <list>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#if !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif
namespace {
int make_server_socket(const std::string& transport, u16bit port)
{
int type = (transport == "tcp") ? SOCK_STREAM : SOCK_DGRAM;
int fd = ::socket(PF_INET, type, 0);
if(fd == -1)
throw std::runtime_error("Unable to acquire socket");
sockaddr_in socket_info;
::memset(&socket_info, 0, sizeof(socket_info));
socket_info.sin_family = AF_INET;
socket_info.sin_port = htons(port);
// FIXME: support limiting listeners
socket_info.sin_addr.s_addr = INADDR_ANY;
if(::bind(fd, (sockaddr*)&socket_info, sizeof(struct sockaddr)) != 0)
{
::close(fd);
throw std::runtime_error("server bind failed");
}
if(transport != "udp")
{
if(::listen(fd, 100) != 0)
{
::close(fd);
throw std::runtime_error("listen failed");
}
}
return fd;
}
bool handshake_complete(const TLS::Session& session)
{
std::cout << "Handshake complete, " << session.version().to_string()
<< " using " << session.ciphersuite().to_string() << "\n";
if(!session.session_id().empty())
std::cout << "Session ID " << hex_encode(session.session_id()) << "\n";
if(!session.session_ticket().empty())
std::cout << "Session ticket " << hex_encode(session.session_ticket()) << "\n";
return true;
}
void dgram_socket_write(int sockfd, const byte buf[], size_t length)
{
ssize_t sent = ::send(sockfd, buf, length, MSG_NOSIGNAL);
if(sent == -1)
std::cout << "Error writing to socket - " << strerror(errno) << "\n";
else if(sent != static_cast<ssize_t>(length))
std::cout << "Packet of length " << length << " truncated to " << sent << "\n";
}
void stream_socket_write(int sockfd, const byte buf[], size_t length)
{
size_t offset = 0;
while(length)
{
ssize_t sent = ::send(sockfd, (const char*)buf + offset,
length, MSG_NOSIGNAL);
if(sent == -1)
{
if(errno == EINTR)
sent = 0;
else
throw std::runtime_error("Socket::write: Socket write failed");
}
offset += sent;
length -= sent;
}
}
void alert_received(TLS::Alert alert, const byte[], size_t)
{
std::cout << "Alert: " << alert.type_string() << "\n";
}
int tls_server(int argc, char* argv[])
{
int port = 4433;
std::string transport = "tcp";
if(argc >= 2)
port = to_u32bit(argv[1]);
if(argc >= 3)
transport = argv[2];
try
{
AutoSeeded_RNG rng;
TLS::Policy policy;
TLS::Session_Manager_In_Memory session_manager(rng);
Credentials_Manager_Simple creds(rng);
/*
* These are the protocols we advertise to the client, but the
* client will send back whatever it actually plans on talking,
* which may or may not take into account what we advertise.
*/
const std::vector<std::string> protocols = { "echo/1.0", "echo/1.1" };
std::cout << "Listening for new connections on " << transport << " port " << port << "\n";
int server_fd = make_server_socket(transport, port);
while(true)
{
try
{
int fd;
if(transport == "tcp")
fd = ::accept(server_fd, nullptr, nullptr);
else
{
struct sockaddr_in from;
socklen_t from_len = sizeof(sockaddr_in);
if(::recvfrom(server_fd, nullptr, 0, MSG_PEEK,
(struct sockaddr*)&from, &from_len) != 0)
throw std::runtime_error("Could not peek next packet");
if(::connect(server_fd, (struct sockaddr*)&from, from_len) != 0)
throw std::runtime_error("Could not connect UDP socket");
fd = server_fd;
}
std::cout << "New connection received\n";
auto socket_write =
(transport == "tcp") ?
std::bind(stream_socket_write, fd, _1, _2) :
std::bind(dgram_socket_write, fd, _1, _2);
std::string s;
std::list<std::string> pending_output;
pending_output.push_back("Welcome to the best echo server evar\n");
auto proc_fn = [&](const byte input[], size_t input_len)
{
for(size_t i = 0; i != input_len; ++i)
{
const char c = static_cast<char>(input[i]);
s += c;
if(c == '\n')
{
pending_output.push_back(s);
s.clear();
}
}
};
TLS::Server server(socket_write,
proc_fn,
alert_received,
handshake_complete,
session_manager,
creds,
policy,
rng,
protocols,
(transport != "tcp"));
while(!server.is_closed())
{
byte buf[4*1024] = { 0 };
ssize_t got = ::read(fd, buf, sizeof(buf));
if(got == -1)
{
std::cout << "Error in socket read - " << strerror(errno) << "\n";
break;
}
if(got == 0)
{
std::cout << "EOF on socket\n";
break;
}
server.received_data(buf, got);
while(server.is_active() && !pending_output.empty())
{
std::string s = pending_output.front();
pending_output.pop_front();
server.send(s);
if(s == "quit\n")
server.close();
}
}
if(transport == "tcp")
::close(fd);
}
catch(std::exception& e)
{
std::cout << "Connection problem: " << e.what() << "\n";
return 1;
}
}
}
catch(std::exception& e)
{
std::cout << e.what() << "\n";
return 1;
}
return 0;
}
REGISTER_APP(tls_server);
}
#endif
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