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authorNuno Goncalves <nunojpg@gmail.com>2019-06-16 08:48:15 +0200
committerNuno Goncalves <nunojpg@gmail.com>2019-10-14 15:59:38 +0200
commit8f8c88c3291c5bbe28d8bdb6aff7b8093ca85ae7 (patch)
treede4a7b9abe5d46c5626f7b55739fa48a0ad36f2f /src/lib/utils
parent5a02e9c100ca49c580ac50bfb88d101d88553972 (diff)
Add UDP client
Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
Diffstat (limited to 'src/lib/utils')
-rw-r--r--src/lib/utils/socket/info.txt2
-rw-r--r--src/lib/utils/socket/socket_udp.cpp337
-rw-r--r--src/lib/utils/socket/socket_udp.h73
3 files changed, 412 insertions, 0 deletions
diff --git a/src/lib/utils/socket/info.txt b/src/lib/utils/socket/info.txt
index 330e784c5..ceeaa18ee 100644
--- a/src/lib/utils/socket/info.txt
+++ b/src/lib/utils/socket/info.txt
@@ -3,7 +3,9 @@ SOCKETS -> 20171216
</defines>
<header:internal>
+uri.h
socket.h
+socket_udp.h
</header:internal>
<libs>
diff --git a/src/lib/utils/socket/socket_udp.cpp b/src/lib/utils/socket/socket_udp.cpp
new file mode 100644
index 000000000..651fe1b0c
--- /dev/null
+++ b/src/lib/utils/socket/socket_udp.cpp
@@ -0,0 +1,337 @@
+/*
+* (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=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(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), left, 0, (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(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), 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;
+ 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;
+ 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 = m_timeout.count() / 1000000;
+ tv.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
+ 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);
+ }
+
+}
diff --git a/src/lib/utils/socket/socket_udp.h b/src/lib/utils/socket/socket_udp.h
new file mode 100644
index 000000000..4a9346c2b
--- /dev/null
+++ b/src/lib/utils/socket/socket_udp.h
@@ -0,0 +1,73 @@
+/*
+* (C) 2015,2016,2017 Jack Lloyd
+* (C) 2019 Nuno Goncalves <nunojpg@gmail.com>
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_SOCKET_UDP_H_
+#define BOTAN_SOCKET_UDP_H_
+
+#include <botan/types.h>
+#include <string>
+#include <chrono>
+
+namespace Botan {
+
+namespace OS {
+
+/*
+* This header is internal (not installed) and these functions are not
+* intended to be called by applications. However they are given public
+* visibility (using BOTAN_TEST_API macro) for the tests. This also probably
+* allows them to be overridden by the application on ELF systems, but
+* this hasn't been tested.
+*/
+
+
+/**
+* A wrapper around a simple blocking UDP socket
+*/
+class BOTAN_TEST_API SocketUDP
+ {
+ public:
+ /**
+ * The socket will be closed upon destruction
+ */
+ virtual ~SocketUDP() = default;
+
+ /**
+ * Write to the socket. Returns immediately.
+ * Throws on error.
+ */
+ virtual void write(const uint8_t buf[], size_t len) = 0;
+
+ /**
+ * Reads up to len bytes, returns bytes written to buf.
+ * Returns 0 on EOF. Throws on error.
+ */
+ virtual size_t read(uint8_t buf[], size_t len) = 0;
+ };
+
+/**
+* Open up a socket. Will throw on error. Returns null if sockets are
+* not available on this platform.
+*/
+std::unique_ptr<SocketUDP>
+BOTAN_TEST_API open_socket_udp(const std::string& hostname,
+ const std::string& service,
+ std::chrono::microseconds timeout);
+
+/**
+* Open up a socket. Will throw on error. Returns null if sockets are
+* not available on this platform.
+*/
+std::unique_ptr<SocketUDP>
+BOTAN_TEST_API open_socket_udp(const std::string& uri,
+ std::chrono::microseconds timeout);
+
+
+} // OS
+} // Botan
+
+#endif