Added support for getaddrinfo() on POSIX.

ChangeLog

@@ -2,6 +2,11 @@
 VERSION 0.8.1cvs
 ================
 
+2005-12-26  Vincent Richard  <vincent@vincent-richard.net>
+
+ * posixSocket.cpp: use getaddrinfo() if available. This should bring
+   thread-safe DNS resolution and IPv6 support.
+
 2005-12-18  Vincent Richard  <vincent@vincent-richard.net>
 
  * IMAPParser.hpp: compatibility bugs + enhanced debugging trace.

SConstruct

@@ -827,6 +827,10 @@ if IsProtocolSupported(messaging_protocols, 'sendmail'):
 
 config_hpp.write("""
 
+// Additional defines
+#define VMIME_HAVE_GETADDRINFO 1
+
+
 #endif // VMIME_CONFIG_HPP_INCLUDED
 """)
 
@@ -1661,10 +1665,17 @@ AC_PATH_PROG(SENDMAIL, sendmail, /usr/sbin/sendmail, /usr/sbin:/usr/lib)
 # Detect some platform-specific stuff
 #
 
+# -- MLang (Windows)
 if test "x$VMIME_DETECT_PLATFORM" = "xwindows"; then
 	AC_CHECK_HEADER(mlang.h, [VMIME_ADDITIONAL_DEFINES="$VMIME_ADDITIONAL_DEFINES HAVE_MLANG_H"])
 fi
 
+# -- getaddrinfo (POSIX)
+if test "x$VMIME_DETECT_PLATFORM" = "xposix"; then
+	AC_CHECK_HEADERS(netdb.h sys/types.h sys/socket.h,)
+	AC_CHECK_FUNC(getaddrinfo, [VMIME_ADDITIONAL_DEFINES="$VMIME_ADDITIONAL_DEFINES HAVE_GETADDRINFO"])
+fi
+
 
 """)
 

src/platforms/posix/posixSocket.cpp

@@ -67,6 +67,65 @@ void posixSocket::connect(const vmime::string& address, const vmime::port_t port
 		m_desc = -1;
 	}
 
+#if VMIME_HAVE_GETADDRINFO  // use thread-safe and IPv6-aware getaddrinfo() if available
+
+	// Resolve address, if needed
+	struct ::addrinfo hints;
+	memset(&hints, 0, sizeof(hints));
+
+	hints.ai_flags = AI_CANONNAME;
+	hints.ai_family = PF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+
+	std::ostringstream portStr;
+	portStr << port;
+
+	struct ::addrinfo* res0;
+
+	if (::getaddrinfo(address.c_str(), portStr.str().c_str(), &hints, &res0) != 0)
+	{
+		// Error: cannot resolve address
+		throw vmime::exceptions::connection_error("Cannot resolve address.");
+	}
+
+	// Connect to host
+	int sock = -1;
+	struct ::addrinfo* res = res0;
+
+	for ( ; sock == -1 && res != NULL ; res = res->ai_next)
+	{
+		sock = ::socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+
+		if (sock < 0)
+			continue;  // try next
+
+		if (::connect(sock, res->ai_addr, res->ai_addrlen) < 0)
+		{
+			::close(sock);
+			sock = -1;
+			continue;  // try next
+		}
+	}
+
+	::freeaddrinfo(res0);
+
+	if (sock == -1)
+	{
+		try
+		{
+			throwSocketError(errno);
+		}
+		catch (exceptions::socket_exception& e)
+		{
+			throw vmime::exceptions::connection_error
+				("Error while connecting socket.", e);
+		}
+	}
+
+	m_desc = sock;
+
+#else // !VMIME_HAVE_GETADDRINFO
+
 	// Resolve address
 	::sockaddr_in addr;
 
@@ -123,6 +182,8 @@ void posixSocket::connect(const vmime::string& address, const vmime::port_t port
 		}
 	}
 
+#endif // VMIME_HAVE_GETADDRINFO
+
 	::fcntl(m_desc, F_SETFL, ::fcntl(m_desc, F_GETFL) | O_NONBLOCK);
 }