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, 22 insertions, 1 deletions

diff --git a/networking/ssl_client.c b/networking/ssl_client.c
index eb84e7726..e56d82fc1 100644
--- a/networking/ssl_client.c
+++ b/networking/ssl_client.c
@@ -15,7 +15,12 @@
 //kbuild:lib-$(CONFIG_SSL_CLIENT) += ssl_client.o
 
 //usage:#define ssl_client_trivial_usage
+//usage:    IF_NOT_PLATFORM_MINGW32(
 //usage:       "[-e] -s FD [-r FD] [-n SNI]"
+//usage:    )
+//usage:    IF_PLATFORM_MINGW32(
+//usage:       "[-e] -h handle [-n SNI]"
+//usage:    )
 //usage:#define ssl_client_full_usage ""
 
 #include "libbb.h"
@@ -26,15 +31,24 @@ int ssl_client_main(int argc UNUSED_PARAM, char **argv)
         tls_state_t *tls;
         const char *sni = NULL;
         int opt;
+#if ENABLE_PLATFORM_MINGW32
+        char *hstr = NULL;
+        HANDLE h;
+#endif
 
         // INIT_G();
 
         tls = new_tls_state();
-        opt = getopt32(argv, "es:#r:#n:", &tls->ofd, &tls->ifd, &sni);
+#if !ENABLE_PLATFORM_MINGW32
+        opt = getopt32(argv, "es:+r:+n:", &tls->ofd, &tls->ifd, &sni);
+
         if (!(opt & (1<<2))) {
                 /* -r N defaults to -s N */
                 tls->ifd = tls->ofd;
         }
+#else
+        opt = getopt32(argv, "eh:n:", &hstr, &sni);
+#endif
 
         if (!(opt & (3<<1))) {
                 if (!argv[1])
@@ -47,6 +61,13 @@ int ssl_client_main(int argc UNUSED_PARAM, char **argv)
                         sni = argv[1];
                 tls->ifd = tls->ofd = create_and_connect_stream_or_die(argv[1], 443);
         }
+#if ENABLE_PLATFORM_MINGW32
+        else {
+                if (!hstr || sscanf(hstr, "%p", &h) != 1)
+                        bb_error_msg_and_die("invalid handle");
+                tls->ifd = tls->ofd = _open_osfhandle((intptr_t)h, _O_RDWR|_O_BINARY);
+        }
+#endif
 
         tls_handshake(tls, sni);