wget: add support for https

Allow wget to support https URLs.  Changes are:

- Add mingw_popen2 which uses a named pipe to allow bidirectional
  communication with a child process;
- Modify ssl_client to accept a WIN32 handle instead of a file
  descriptor as an argument;
- Allow tls_get_random to open /dev/urandom;
- Using the above changes implement a WIN32 version of spawn_ssl_client
  in wget.

This closes GitHub issue #75.

Also, enable authentication in wget.

1 files changed, 6 insertions, 0 deletions

diff --git a/networking/tls.c b/networking/tls.c
index 99722cfb4..ec5a56d57 100644
--- a/networking/tls.c
+++ b/networking/tls.c
@@ -289,8 +289,14 @@ static void dump_tls_record(const void *vp, int len)
 
 void tls_get_random(void *buf, unsigned len)
 {
+#if !ENABLE_PLATFORM_MINGW32
         if (len != open_read_close("/dev/urandom", buf, len))
                 xfunc_die();
+#else
+        int fd = mingw_open("/dev/urandom", O_RDONLY|O_SPECIAL);
+        if (fd < 0 || len != read_close(fd, buf, len))
+                xfunc_die();
+#endif
 }
 
 /* Nondestructively see the current hash value */