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, 27 insertions, 0 deletions

diff --git a/networking/wget.c b/networking/wget.c
index 150bc8e12..776894dca 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -714,6 +714,7 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
 #endif
 
 #if ENABLE_FEATURE_WGET_HTTPS
+# if !ENABLE_PLATFORM_MINGW32
 static void spawn_ssl_client(const char *host, int network_fd, int flags)
 {
         int sp[2];
@@ -763,6 +764,32 @@ static void spawn_ssl_client(const char *host, int network_fd, int flags)
         close(sp[1]);
         xmove_fd(sp[0], network_fd);
 }
+# else
+static void spawn_ssl_client(const char *host, int network_fd, int flags)
+{
+        int fd1;
+        pid_t pid;
+        char *servername, *p, *cmd;
+
+        servername = xstrdup(host);
+        p = strrchr(servername, ':');
+        if (p) *p = '\0';
+
+        fflush_all();
+
+        cmd = xasprintf("%s ssl_client -h %p -n %s%s", bb_busybox_exec_path,
+                                        (void *)_get_osfhandle(network_fd), servername,
+                                        flags & TLSLOOP_EXIT_ON_LOCAL_EOF ? " -e" : "");
+
+        if ( (fd1=mingw_popen2(cmd, &pid)) == -1 ) {
+                bb_perror_msg_and_die("can't execute ssl_client");
+        }
+
+        free(cmd);
+        free(servername);
+        xmove_fd(fd1, network_fd);
+}
+# endif
 #endif
 
 static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa)