1 files changed, 55 insertions, 0 deletions
diff --git a/networking/ssl_client.c b/networking/ssl_client.c
new file mode 100644
index 0000000..cfeae15
--- /dev/null
+++ b/networking/ssl_client.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2017 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+//config:config SSL_CLIENT
+//config:	bool "ssl_client"
+//config:	default y
+//config:	select TLS
+//config:	help
+//config:	  This tool pipes data to/from a socket, TLS-encrypting it.
+
+//applet:IF_SSL_CLIENT(APPLET(ssl_client, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_SSL_CLIENT) += ssl_client.o
+
+//usage:#define ssl_client_trivial_usage
+//usage:       "-s FD [-r FD] [-n SNI]"
+//usage:#define ssl_client_full_usage ""
+
+#include "libbb.h"
+
+int ssl_client_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ssl_client_main(int argc UNUSED_PARAM, char **argv)
+{
+	tls_state_t *tls;
+	const char *sni = NULL;
+	int opt;
+
+	// INIT_G();
+
+	tls = new_tls_state();
+	opt = getopt32(argv, "s:#r:#n:", &tls->ofd, &tls->ifd, &sni);
+	if (!(opt & 2)) {
+		/* -r N defaults to -s N */
+		tls->ifd = tls->ofd;
+	}
+
+	if (!(opt & 3)) {
+		if (!argv[1])
+			bb_show_usage();
+		/* Undocumented debug feature: without -s and -r, takes HOST arg and connects to it */
+		//
+		// Talk to kernel.org:
+		// printf "GET / HTTP/1.1\r\nHost: kernel.org\r\n\r\n" | ./busybox ssl_client kernel.org
+		if (!sni)
+			sni = argv[1];
+		tls->ifd = tls->ofd = create_and_connect_stream_or_die(argv[1], 443);
+	}
+
+	tls_handshake(tls, sni);
+	tls_run_copy_loop(tls);
+
+	return EXIT_SUCCESS;
+}