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/*
* (C) 2015,2016,2017 Jack Lloyd
* (C) 2016 Daniel Neus
* (C) 2019 Nuno Goncalves <nunojpg@gmail.com>
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/socket_udp.h>
#include <botan/internal/uri.h>
#include <botan/exceptn.h>
#include <botan/mem_ops.h>
#include <chrono>
#if defined(BOTAN_HAS_BOOST_ASIO)
/*
* We don't need serial port support anyway, and asking for it
* causes macro conflicts with Darwin's termios.h when this
* file is included in the amalgamation. GH #350
*/
#define BOOST_ASIO_DISABLE_SERIAL_PORT
#include <boost/asio.hpp>
#include <boost/asio/system_timer.hpp>
#elif defined(BOTAN_TARGET_OS_HAS_SOCKETS)
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#elif defined(BOTAN_TARGET_OS_HAS_WINSOCK2)
#include <ws2tcpip.h>
#endif
namespace Botan {
namespace {
#if defined(BOTAN_HAS_BOOST_ASIO)
class Asio_SocketUDP final : public OS::SocketUDP
{
public:
Asio_SocketUDP(const std::string& hostname,
const std::string& service,
std::chrono::microseconds timeout) :
m_timeout(timeout), m_timer(m_io), m_udp(m_io)
{
m_timer.expires_from_now(m_timeout);
check_timeout();
boost::asio::ip::udp::resolver resolver(m_io);
boost::asio::ip::udp::resolver::query query(hostname, service);
boost::asio::ip::udp::resolver::iterator dns_iter = resolver.resolve(query);
boost::system::error_code ec = boost::asio::error::would_block;
auto connect_cb = [&ec](const boost::system::error_code& e,
boost::asio::ip::udp::resolver::iterator) { ec = e; };
boost::asio::async_connect(m_udp, dns_iter, connect_cb);
while(ec == boost::asio::error::would_block)
{
m_io.run_one();
}
if(ec)
{ throw boost::system::system_error(ec); }
if(m_udp.is_open() == false)
{ throw System_Error("Connection to host " + hostname + " failed"); }
}
void write(const uint8_t buf[], size_t len) override
{
m_timer.expires_from_now(m_timeout);
boost::system::error_code ec = boost::asio::error::would_block;
m_udp.async_send(boost::asio::buffer(buf, len),
[&ec](boost::system::error_code e, size_t) { ec = e; });
while(ec == boost::asio::error::would_block)
{
m_io.run_one();
}
if(ec)
{
throw boost::system::system_error(ec);
}
}
size_t read(uint8_t buf[], size_t len) override
{
m_timer.expires_from_now(m_timeout);
boost::system::error_code ec = boost::asio::error::would_block;
size_t got = 0;
m_udp.async_receive(boost::asio::buffer(buf, len),
[&](boost::system::error_code cb_ec, size_t cb_got) { ec = cb_ec; got = cb_got; });
while(ec == boost::asio::error::would_block)
{
m_io.run_one();
}
if(ec)
{
if(ec == boost::asio::error::eof)
{ return 0; }
throw boost::system::system_error(ec); // Some other error.
}
return got;
}
private:
void check_timeout()
{
if(m_udp.is_open() && m_timer.expires_at() < std::chrono::system_clock::now())
{
boost::system::error_code err;
m_udp.close(err);
}
m_timer.async_wait(std::bind(&Asio_SocketUDP::check_timeout, this));
}
const std::chrono::microseconds m_timeout;
boost::asio::io_service m_io;
boost::asio::system_timer m_timer;
boost::asio::ip::udp::socket m_udp;
};
#elif defined(BOTAN_TARGET_OS_HAS_SOCKETS) || defined(BOTAN_TARGET_OS_HAS_WINSOCK2)
class BSD_SocketUDP final : public OS::SocketUDP
{
public:
BSD_SocketUDP(const std::string& hostname,
const std::string& service,
std::chrono::microseconds timeout) : m_timeout(timeout)
{
socket_init();
m_socket = invalid_socket();
addrinfo* res;
addrinfo hints;
clear_mem(&hints, 1);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
int rc = ::getaddrinfo(hostname.c_str(), service.c_str(), &hints, &res);
if(rc != 0)
{
throw System_Error("Name resolution failed for " + hostname, rc);
}
for(addrinfo* rp = res; (m_socket == invalid_socket()) && (rp != nullptr); rp = rp->ai_next)
{
if(rp->ai_family != AF_INET && rp->ai_family != AF_INET6)
{ continue; }
m_socket = ::socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if(m_socket == invalid_socket())
{
// unsupported socket type?
continue;
}
set_nonblocking(m_socket);
memcpy(&sa, res->ai_addr, res->ai_addrlen);
salen = static_cast<socklen_t>(res->ai_addrlen);
}
::freeaddrinfo(res);
if(m_socket == invalid_socket())
{
throw System_Error("Connecting to " + hostname +
" for service " + service + " failed", errno);
}
}
~BSD_SocketUDP()
{
close_socket(m_socket);
m_socket = invalid_socket();
socket_fini();
}
void write(const uint8_t buf[], size_t len) override
{
fd_set write_set;
FD_ZERO(&write_set);
FD_SET(m_socket, &write_set);
size_t sent_so_far = 0;
while(sent_so_far != len)
{
struct timeval timeout = make_timeout_tv();
int active = ::select(static_cast<int>(m_socket + 1), nullptr, &write_set, nullptr, &timeout);
if(active == 0)
{ throw System_Error("Timeout during socket write"); }
const size_t left = len - sent_so_far;
socket_op_ret_type sent = ::sendto(m_socket, cast_uint8_ptr_to_char(buf + sent_so_far),
static_cast<sendrecv_len_type>(left), 0,
reinterpret_cast<sockaddr*>(&sa), salen);
if(sent < 0)
{ throw System_Error("Socket write failed", errno); }
else
{ sent_so_far += static_cast<size_t>(sent); }
}
}
size_t read(uint8_t buf[], size_t len) override
{
fd_set read_set;
FD_ZERO(&read_set);
FD_SET(m_socket, &read_set);
struct timeval timeout = make_timeout_tv();
int active = ::select(static_cast<int>(m_socket + 1), &read_set, nullptr, nullptr, &timeout);
if(active == 0)
{ throw System_Error("Timeout during socket read"); }
socket_op_ret_type got = ::recvfrom(m_socket, cast_uint8_ptr_to_char(buf), static_cast<sendrecv_len_type>(len), 0, nullptr, nullptr);
if(got < 0)
{ throw System_Error("Socket read failed", errno); }
return static_cast<size_t>(got);
}
private:
#if defined(BOTAN_TARGET_OS_HAS_WINSOCK2)
typedef SOCKET socket_type;
typedef int socket_op_ret_type;
typedef int sendrecv_len_type;
static socket_type invalid_socket() { return INVALID_SOCKET; }
static void close_socket(socket_type s) { ::closesocket(s); }
static std::string get_last_socket_error() { return std::to_string(::WSAGetLastError()); }
static bool nonblocking_connect_in_progress()
{
return (::WSAGetLastError() == WSAEWOULDBLOCK);
}
static void set_nonblocking(socket_type s)
{
u_long nonblocking = 1;
::ioctlsocket(s, FIONBIO, &nonblocking);
}
static void socket_init()
{
WSAData wsa_data;
WORD wsa_version = MAKEWORD(2, 2);
if(::WSAStartup(wsa_version, &wsa_data) != 0)
{
throw System_Error("WSAStartup() failed", WSAGetLastError());
}
if(LOBYTE(wsa_data.wVersion) != 2 || HIBYTE(wsa_data.wVersion) != 2)
{
::WSACleanup();
throw System_Error("Could not find a usable version of Winsock.dll");
}
}
static void socket_fini()
{
::WSACleanup();
}
#else
typedef int socket_type;
typedef ssize_t socket_op_ret_type;
typedef size_t sendrecv_len_type;
static socket_type invalid_socket() { return -1; }
static void close_socket(socket_type s) { ::close(s); }
static std::string get_last_socket_error() { return ::strerror(errno); }
static bool nonblocking_connect_in_progress() { return (errno == EINPROGRESS); }
static void set_nonblocking(socket_type s)
{
if(::fcntl(s, F_SETFL, O_NONBLOCK) < 0)
{ throw System_Error("Setting socket to non-blocking state failed", errno); }
}
static void socket_init() {}
static void socket_fini() {}
#endif
sockaddr_storage sa;
socklen_t salen;
struct timeval make_timeout_tv() const
{
struct timeval tv;
tv.tv_sec = static_cast<decltype(timeval::tv_sec)>(m_timeout.count() / 1000000);
tv.tv_usec = static_cast<decltype(timeval::tv_usec)>(m_timeout.count() % 1000000);;
return tv;
}
const std::chrono::microseconds m_timeout;
socket_type m_socket;
};
#endif
}
std::unique_ptr<OS::SocketUDP>
OS::open_socket_udp(const std::string& hostname,
const std::string& service,
std::chrono::microseconds timeout)
{
#if defined(BOTAN_HAS_BOOST_ASIO)
return std::unique_ptr<OS::SocketUDP>(new Asio_SocketUDP(hostname, service, timeout));
#elif defined(BOTAN_TARGET_OS_HAS_SOCKETS) || defined(BOTAN_TARGET_OS_HAS_WINSOCK2)
return std::unique_ptr<OS::SocketUDP>(new BSD_SocketUDP(hostname, service, timeout));
#else
BOTAN_UNUSED(hostname);
BOTAN_UNUSED(service);
BOTAN_UNUSED(timeout);
return std::unique_ptr<OS::SocketUDP>();
#endif
}
std::unique_ptr<OS::SocketUDP>
OS::open_socket_udp(const std::string& uri_string,
std::chrono::microseconds timeout)
{
const auto uri = URI::fromAny(uri_string);
if(uri.port == 0)
{ throw Invalid_Argument("UDP port not specified"); }
return open_socket_udp(uri.host, std::to_string(uri.port), timeout);
}
}