Merge GH #1360 Add timeouts to HTTP socket operations

Fixes #1326

7 files changed, 431 insertions, 315 deletions

diff --git a/src/lib/utils/http_util/http_util.cpp b/src/lib/utils/http_util/http_util.cpp
index 8dcd8d55a..f5f9c0213 100644
--- a/src/lib/utils/http_util/http_util.cpp
+++ b/src/lib/utils/http_util/http_util.cpp
@@ -25,13 +25,16 @@ namespace {
 * closes the socket.
 */
 std::string http_transact(const std::string& hostname,
-                          const std::string& message)
+                          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");
+      socket = OS::open_socket(hostname, "http", timeout);
       if(!socket)
          throw Exception("No socket support enabled in build");
       }
@@ -44,6 +47,9 @@ std::string http_transact(const std::string& hostname,
    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)
@@ -52,6 +58,9 @@ std::string http_transact(const std::string& hostname,
       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));
       }
@@ -205,10 +214,17 @@ 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)
+                   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(
-      http_transact,
+      transact_with_timeout,
       verb,
       url,
       content_type,
@@ -216,17 +232,20 @@ Response http_sync(const std::string& verb,
       allowable_redirects);
    }
 
-Response GET_sync(const std::string& url, size_t 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);
+   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)
+                   size_t allowable_redirects,
+                   std::chrono::milliseconds timeout)
    {
-   return http_sync("POST", url, content_type, body, allowable_redirects);
+   return http_sync("POST", url, content_type, body, allowable_redirects, timeout);
    }
 
 }
diff --git a/src/lib/utils/http_util/http_util.h b/src/lib/utils/http_util/http_util.h
index ea6122c07..9edd3d983 100644
--- a/src/lib/utils/http_util/http_util.h
+++ b/src/lib/utils/http_util/http_util.h
@@ -14,6 +14,7 @@
 #include <map>
 #include <string>
 #include <functional>
+#include <chrono>
 
 namespace Botan {
 
@@ -69,25 +70,28 @@ BOTAN_PUBLIC_API(2,0) std::ostream& operator<<(std::ostream& o, const Response&
 typedef std::function<std::string (const std::string&, const std::string&)> http_exch_fn;
 
 BOTAN_PUBLIC_API(2,0) Response http_sync(http_exch_fn fn,
-                             const std::string& verb,
-                             const std::string& url,
-                             const std::string& content_type,
-                             const std::vector<uint8_t>& body,
-                             size_t allowable_redirects);
+                                         const std::string& verb,
+                                         const std::string& url,
+                                         const std::string& content_type,
+                                         const std::vector<uint8_t>& body,
+                                         size_t allowable_redirects);
 
 BOTAN_PUBLIC_API(2,0) 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);
+                                         const std::string& url,
+                                         const std::string& content_type,
+                                         const std::vector<uint8_t>& body,
+                                         size_t allowable_redirects,
+                                         std::chrono::milliseconds timeout = std::chrono::milliseconds(3000));
 
 BOTAN_PUBLIC_API(2,0) Response GET_sync(const std::string& url,
-                            size_t allowable_redirects = 1);
+                                        size_t allowable_redirects = 1,
+                                        std::chrono::milliseconds timeout = std::chrono::milliseconds(3000));
 
 BOTAN_PUBLIC_API(2,0) Response POST_sync(const std::string& url,
-                             const std::string& content_type,
-                             const std::vector<uint8_t>& body,
-                             size_t allowable_redirects = 1);
+                                         const std::string& content_type,
+                                         const std::vector<uint8_t>& body,
+                                         size_t allowable_redirects = 1,
+                                         std::chrono::milliseconds timeout = std::chrono::milliseconds(3000));
 
 BOTAN_PUBLIC_API(2,0) std::string url_encode(const std::string& url);
 
diff --git a/src/lib/utils/http_util/info.txt b/src/lib/utils/http_util/info.txt
index a6cbd902f..a3ebc249e 100644
--- a/src/lib/utils/http_util/info.txt
+++ b/src/lib/utils/http_util/info.txt
@@ -6,12 +6,6 @@ HTTP_UTIL -> 20171003
 http_util.h
 </header:public>
 
-<header:internal>
-socket.h
-</header:internal>
-
-<libs>
-linux -> rt
-mingw -> ws2_32
-windows -> ws2_32.lib
-</libs>
+<requires>
+socket
+</requires>
diff --git a/src/lib/utils/http_util/socket.cpp b/src/lib/utils/http_util/socket.cpp
deleted file mode 100644
index a2b9d5567..000000000
--- a/src/lib/utils/http_util/socket.cpp
+++ /dev/null
@@ -1,283 +0,0 @@
-/*
-* OS and machine specific utility functions
-* (C) 2015,2016,2017 Jack Lloyd
-* (C) 2016 Daniel Neus
-*
-* Botan is released under the Simplified BSD License (see license.txt)
-*/
-
-#include <botan/internal/socket.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>
-
-#elif defined(BOTAN_TARGET_OS_TYPE_IS_UNIX)
-  #include <sys/socket.h>
-  #include <netinet/in.h>
-  #include <netdb.h>
-  #include <string.h>
-  #include <unistd.h>
-  #include <errno.h>
-
-#elif defined(BOTAN_TARGET_OS_TYPE_IS_WINDOWS)
-  #define NOMINMAX 1
-  #include <winsock2.h>
-  #include <ws2tcpip.h>
-  #include <windows.h>
-#endif
-
-namespace Botan {
-
-namespace {
-
-#if defined(BOTAN_HAS_BOOST_ASIO)
-
-class Asio_Socket final : public OS::Socket
-   {
-   public:
-      Asio_Socket(const std::string& hostname, const std::string& service) :
-         m_tcp(m_io)
-         {
-         boost::asio::ip::tcp::resolver resolver(m_io);
-         boost::asio::ip::tcp::resolver::query query(hostname, service);
-         boost::asio::connect(m_tcp, resolver.resolve(query));
-         }
-
-      void write(const uint8_t buf[], size_t len) override
-         {
-         boost::asio::write(m_tcp, boost::asio::buffer(buf, len));
-         }
-
-      size_t read(uint8_t buf[], size_t len) override
-         {
-         boost::system::error_code error;
-         size_t got = m_tcp.read_some(boost::asio::buffer(buf, len), error);
-
-         if(error)
-            {
-            if(error == boost::asio::error::eof)
-               return 0;
-            throw boost::system::system_error(error); // Some other error.
-            }
-
-         return got;
-         }
-
-   private:
-      boost::asio::io_service m_io;
-      boost::asio::ip::tcp::socket m_tcp;
-   };
-
-#elif defined(BOTAN_TARGET_OS_TYPE_IS_WINDOWS)
-
-class Winsock_Socket final : public OS::Socket
-   {
-   public:
-      Winsock_Socket(const std::string& hostname, const std::string& service)
-         {
-         WSAData wsa_data;
-         WORD wsa_version = MAKEWORD(2, 2);
-
-         if (::WSAStartup(wsa_version, &wsa_data) != 0)
-            {
-            throw Exception("WSAStartup() failed: " + std::to_string(WSAGetLastError()));
-            }
-
-         if (LOBYTE(wsa_data.wVersion) != 2 || HIBYTE(wsa_data.wVersion) != 2)
-            {
-            ::WSACleanup();
-            throw Exception("Could not find a usable version of Winsock.dll");
-            }
-
-         addrinfo hints;
-         ::memset(&hints, 0, sizeof(addrinfo));
-         hints.ai_family = AF_UNSPEC;
-         hints.ai_socktype = SOCK_STREAM;
-         addrinfo* res;
-
-         if(::getaddrinfo(hostname.c_str(), service.c_str(), &hints, &res) != 0)
-            {
-            throw Exception("Name resolution failed for " + hostname);
-            }
-
-         for(addrinfo* rp = res; (m_socket == INVALID_SOCKET) && (rp != nullptr); rp = rp->ai_next)
-            {
-            m_socket = ::socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
-
-            // unsupported socket type?
-            if(m_socket == INVALID_SOCKET)
-               continue;
-
-            if(::connect(m_socket, rp->ai_addr, rp->ai_addrlen) != 0)
-               {
-               ::closesocket(m_socket);
-               m_socket = INVALID_SOCKET;
-               continue;
-               }
-            }
-
-         ::freeaddrinfo(res);
-
-         if(m_socket == INVALID_SOCKET)
-            {
-            throw Exception("Connecting to " + hostname +
-                            " for service " + service + " failed");
-            }
-         }
-
-      ~Winsock_Socket()
-         {
-         ::closesocket(m_socket);
-         m_socket = INVALID_SOCKET;
-         ::WSACleanup();
-         }
-
-      void write(const uint8_t buf[], size_t len) override
-         {
-         size_t sent_so_far = 0;
-         while(sent_so_far != len)
-            {
-            const size_t left = len - sent_so_far;
-            int sent = ::send(m_socket,
-                              cast_uint8_ptr_to_char(buf + sent_so_far),
-                              static_cast<int>(left),
-                              0);
-
-            if(sent == SOCKET_ERROR)
-               throw Exception("Socket write failed with error " +
-                               std::to_string(::WSAGetLastError()));
-            else
-               sent_so_far += static_cast<size_t>(sent);
-            }
-         }
-
-      size_t read(uint8_t buf[], size_t len) override
-         {
-         int got = ::recv(m_socket,
-                          cast_uint8_ptr_to_char(buf),
-                          static_cast<int>(len), 0);
-
-         if(got == SOCKET_ERROR)
-            throw Exception("Socket read failed with error " +
-                            std::to_string(::WSAGetLastError()));
-         return static_cast<size_t>(got);
-         }
-
-   private:
-      SOCKET m_socket = INVALID_SOCKET;
-   };
-
-#elif defined(BOTAN_TARGET_OS_TYPE_IS_UNIX)
-class BSD_Socket final : public OS::Socket
-   {
-   public:
-      BSD_Socket(const std::string& hostname, const std::string& service)
-         {
-         addrinfo hints;
-         ::memset(&hints, 0, sizeof(addrinfo));
-         hints.ai_family = AF_UNSPEC;
-         hints.ai_socktype = SOCK_STREAM;
-         addrinfo* res;
-
-         if(::getaddrinfo(hostname.c_str(), service.c_str(), &hints, &res) != 0)
-            {
-            throw Exception("Name resolution failed for " + hostname);
-            }
-
-         m_fd = -1;
-
-         for(addrinfo* rp = res; (m_fd < 0) && (rp != nullptr); rp = rp->ai_next)
-            {
-            m_fd = ::socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
-
-            if(m_fd < 0)
-               {
-               // unsupported socket type?
-               continue;
-               }
-
-            if(::connect(m_fd, rp->ai_addr, rp->ai_addrlen) != 0)
-               {
-               ::close(m_fd);
-               m_fd = -1;
-               continue;
-               }
-            }
-
-         ::freeaddrinfo(res);
-
-         if(m_fd < 0)
-            {
-            throw Exception("Connecting to " + hostname +
-                            " for service " + service + " failed");
-            }
-         }
-
-      ~BSD_Socket()
-         {
-         ::close(m_fd);
-         m_fd = -1;
-         }
-
-      void write(const uint8_t buf[], size_t len) override
-         {
-         size_t sent_so_far = 0;
-         while(sent_so_far != len)
-            {
-            const size_t left = len - sent_so_far;
-            ssize_t sent = ::write(m_fd, &buf[sent_so_far], left);
-            if(sent < 0)
-               throw Exception("Socket write failed with error '" +
-                               std::string(::strerror(errno)) + "'");
-            else
-               sent_so_far += static_cast<size_t>(sent);
-            }
-         }
-
-      size_t read(uint8_t buf[], size_t len) override
-         {
-         ssize_t got = ::read(m_fd, buf, len);
-
-         if(got < 0)
-            throw Exception("Socket read failed with error '" +
-                            std::string(::strerror(errno)) + "'");
-         return static_cast<size_t>(got);
-         }
-
-   private:
-      int m_fd;
-   };
-
-#endif
-
-}
-
-std::unique_ptr<OS::Socket>
-OS::open_socket(const std::string& hostname,
-                const std::string& service)
-   {
-#if defined(BOTAN_HAS_BOOST_ASIO)
-   return std::unique_ptr<OS::Socket>(new Asio_Socket(hostname, service));
-
-#elif defined(BOTAN_TARGET_OS_TYPE_IS_WINDOWS)
-   return std::unique_ptr<OS::Socket>(new Winsock_Socket(hostname, service));
-
-#elif defined(BOTAN_TARGET_OS_TYPE_IS_UNIX)
-   return std::unique_ptr<OS::Socket>(new BSD_Socket(hostname, service));
-
-#else
-   // No sockets for you
-   return std::unique_ptr<Socket>();
-#endif
-   }
-
-}
diff --git a/src/lib/utils/socket/info.txt b/src/lib/utils/socket/info.txt
new file mode 100644
index 000000000..ef0d939ea
--- /dev/null
+++ b/src/lib/utils/socket/info.txt
@@ -0,0 +1,13 @@
+<defines>
+SOCKETS -> 20171216
+</defines>
+
+<header:internal>
+socket.h
+</header:internal>
+
+<libs>
+linux -> rt
+mingw -> ws2_32
+windows -> ws2_32.lib
+</libs>
diff --git a/src/lib/utils/socket/socket.cpp b/src/lib/utils/socket/socket.cpp
new file mode 100644
index 000000000..f263531dd
--- /dev/null
+++ b/src/lib/utils/socket/socket.cpp
@@ -0,0 +1,367 @@
+/*
+* (C) 2015,2016,2017 Jack Lloyd
+* (C) 2016 Daniel Neus
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/internal/socket.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_TYPE_IS_UNIX)
+  #include <sys/socket.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_TYPE_IS_WINDOWS)
+  #define NOMINMAX 1
+  #include <winsock2.h>
+  #include <ws2tcpip.h>
+  #include <windows.h>
+#endif
+
+namespace Botan {
+
+namespace {
+
+#if defined(BOTAN_HAS_BOOST_ASIO)
+
+class Asio_Socket final : public OS::Socket
+   {
+   public:
+      Asio_Socket(const std::string& hostname,
+                  const std::string& service,
+                  std::chrono::milliseconds timeout) :
+         m_timeout(timeout), m_timer(m_io), m_tcp(m_io)
+         {
+         m_timer.expires_from_now(m_timeout);
+         check_timeout();
+
+         boost::asio::ip::tcp::resolver resolver(m_io);
+         boost::asio::ip::tcp::resolver::query query(hostname, service);
+         boost::asio::ip::tcp::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::tcp::resolver::iterator) { ec = e; };
+
+         boost::asio::async_connect(m_tcp, dns_iter, connect_cb);
+
+         while(ec == boost::asio::error::would_block)
+            {
+            m_io.run_one();
+            }
+
+         if(ec)
+            throw boost::system::system_error(ec);
+         if(ec || m_tcp.is_open() == false)
+            throw Exception("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;
+
+         boost::asio::async_write(m_tcp, boost::asio::buffer(buf, len),
+                                  [&ec](boost::system::error_code e, size_t got) { printf("wrote %d\n", got); 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;
+
+         auto read_cb = [&](const boost::system::error_code cb_ec, size_t cb_got) {
+            ec = cb_ec; got = cb_got;
+         };
+
+         m_tcp.async_read_some(boost::asio::buffer(buf, len), read_cb);
+
+         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_tcp.is_open() && m_timer.expires_at() < std::chrono::system_clock::now())
+            {
+            boost::system::error_code err;
+            m_tcp.close(err);
+            }
+
+         m_timer.async_wait(std::bind(&Asio_Socket::check_timeout, this));
+         }
+
+      const std::chrono::milliseconds m_timeout;
+      boost::asio::io_service m_io;
+      boost::asio::system_timer m_timer;
+      boost::asio::ip::tcp::socket m_tcp;
+   };
+
+#elif defined(BOTAN_TARGET_OS_TYPE_IS_UNIX) || defined(BOTAN_TARGET_OS_TYPE_IS_WINDOWS)
+
+class BSD_Socket final : public OS::Socket
+   {
+   private:
+#if defined(BOTAN_TARGET_OS_TYPE_IS_WINDOWS)
+      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 Exception("WSAStartup() failed: " + std::to_string(WSAGetLastError()));
+            }
+
+         if (LOBYTE(wsa_data.wVersion) != 2 || HIBYTE(wsa_data.wVersion) != 2)
+            {
+            ::WSACleanup();
+            throw Exception("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 Exception("Setting socket to non-blocking state failed");
+         }
+
+      static void socket_init() {}
+      static void socket_fini() {}
+#endif
+
+   public:
+      BSD_Socket(const std::string& hostname,
+                 const std::string& service,
+                 std::chrono::microseconds timeout) : m_timeout(timeout)
+         {
+         socket_init();
+
+         m_socket = invalid_socket();
+
+         addrinfo hints;
+         ::memset(&hints, 0, sizeof(addrinfo));
+         hints.ai_family = AF_UNSPEC;
+         hints.ai_socktype = SOCK_STREAM;
+         addrinfo* res;
+
+         if(::getaddrinfo(hostname.c_str(), service.c_str(), &hints, &res) != 0)
+            {
+            throw Exception("Name resolution failed for " + hostname);
+            }
+
+         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);
+
+            int err = ::connect(m_socket, rp->ai_addr, rp->ai_addrlen);
+
+            if(err == -1)
+               {
+               int active = 0;
+               if(nonblocking_connect_in_progress())
+                  {
+                  struct timeval timeout = make_timeout_tv();
+                  fd_set write_set;
+                  FD_ZERO(&write_set);
+                  FD_SET(m_socket, &write_set);
+
+                  active = ::select(m_socket + 1, nullptr, &write_set, nullptr, &timeout);
+
+                  if(active)
+                     {
+                     int socket_error = 0;
+                     socklen_t len = sizeof(socket_error);
+
+                     if(::getsockopt(m_socket, SOL_SOCKET, SO_ERROR, reinterpret_cast<char*>(&socket_error), &len) < 0)
+                        throw Exception("Error calling getsockopt");
+
+                     if(socket_error != 0)
+                        {
+                        active = 0;
+                        }
+                     }
+                  }
+
+               if(active == 0)
+                  {
+                  close_socket(m_socket);
+                  m_socket = invalid_socket();
+                  continue;
+                  }
+               }
+            }
+
+         ::freeaddrinfo(res);
+
+         if(m_socket == invalid_socket())
+            {
+            throw Exception("Connecting to " + hostname +
+                            " for service " + service + " failed");
+            }
+         }
+
+      ~BSD_Socket()
+         {
+         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 Exception("Timeout during socket write");
+
+            const size_t left = len - sent_so_far;
+            socket_op_ret_type sent = ::send(m_socket, cast_uint8_ptr_to_char(&buf[sent_so_far]), left, 0);
+            if(sent < 0)
+               throw Exception("Socket write failed with error '" +
+                               std::string(::strerror(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 Exception("Timeout during socket read");
+
+         socket_op_ret_type got = ::recv(m_socket, cast_uint8_ptr_to_char(buf), len, 0);
+
+         if(got < 0)
+            throw Exception("Socket read failed with error '" +
+                            std::string(::strerror(errno)) + "'");
+         return static_cast<size_t>(got);
+         }
+
+   private:
+      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::Socket>
+OS::open_socket(const std::string& hostname,
+                const std::string& service,
+                std::chrono::milliseconds timeout)
+   {
+#if defined(BOTAN_HAS_BOOST_ASIO)
+   return std::unique_ptr<OS::Socket>(new Asio_Socket(hostname, service, timeout));
+
+#elif defined(BOTAN_TARGET_OS_TYPE_IS_UNIX) || defined(BOTAN_TARGET_OS_TYPE_IS_WINDOWS)
+   return std::unique_ptr<OS::Socket>(new BSD_Socket(hostname, service, timeout));
+
+#else
+   // No sockets for you
+   return std::unique_ptr<Socket>();
+#endif
+   }
+
+}
diff --git a/src/lib/utils/http_util/socket.h b/src/lib/utils/socket/socket.h
index 4961738ae..03a951478 100644
--- a/src/lib/utils/http_util/socket.h
+++ b/src/lib/utils/socket/socket.h
@@ -9,7 +9,8 @@
 #define BOTAN_SOCKET_H_
 
 #include <botan/types.h>
-#include <functional>
+#include <string>
+#include <chrono>
 
 namespace Botan {
 
@@ -54,7 +55,8 @@ class BOTAN_TEST_API Socket
 */
 std::unique_ptr<Socket>
 BOTAN_TEST_API open_socket(const std::string& hostname,
-                      const std::string& service);
+                           const std::string& service,
+                           std::chrono::milliseconds timeout);
 
 } // OS
 } // Botan