wget: initial support for ftps://

function                                             old     new   delta
spawn_ssl_client                                       -     185    +185
parse_url                                            409     461     +52
packed_usage                                       32259   32278     +19
tls_run_copy_loop                                    293     306     +13
ssl_client_main                                      128     138     +10
showmode                                             330     338      +8
P_FTPS                                                 -       5      +5
filter_datapoints                                    177     179      +2
deflate                                              907     905      -2
decode_one_format                                    723     716      -7
wget_main                                           2591    2440    -151
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 6/3 up/down: 294/-160)          Total: 134 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 40 insertions, 15 deletions

diff --git a/networking/ssl_client.c b/networking/ssl_client.c
index d479846d7..eb84e7726 100644
--- a/networking/ssl_client.c
+++ b/networking/ssl_client.c
@@ -15,7 +15,7 @@
 //kbuild:lib-$(CONFIG_SSL_CLIENT) += ssl_client.o
 
 //usage:#define ssl_client_trivial_usage
-//usage:       "-s FD [-r FD] [-n SNI]"
+//usage:       "[-e] -s FD [-r FD] [-n SNI]"
 //usage:#define ssl_client_full_usage ""
 
 #include "libbb.h"
@@ -30,26 +30,28 @@ int ssl_client_main(int argc UNUSED_PARAM, char **argv)
 	// INIT_G();
 
 	tls = new_tls_state();
-	opt = getopt32(argv, "s:#r:#n:", &tls->ofd, &tls->ifd, &sni);
-	if (!(opt & 2)) {
+	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;
 	}
 
-	if (!(opt & 3)) {
+	if (!(opt & (3<<1))) {
 		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
+		// 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);
+
+	BUILD_BUG_ON(TLSLOOP_EXIT_ON_LOCAL_EOF != 1);
+	tls_run_copy_loop(tls, /*flags*/ opt & 1);
 
 	return EXIT_SUCCESS;
 }
diff --git a/networking/tls.c b/networking/tls.c
index 7936afca2..da7b6058f 100644
--- a/networking/tls.c
+++ b/networking/tls.c
@@ -1727,7 +1727,7 @@ static void tls_xwrite(tls_state_t *tls, int len)
 // openssl s_server -key key.pem -cert server.pem -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher NULL
 // openssl s_client -connect 127.0.0.1:4433 -debug -tls1_2 -no_tls1 -no_tls1_1 -cipher NULL-SHA256
 
-void FAST_FUNC tls_run_copy_loop(tls_state_t *tls)
+void FAST_FUNC tls_run_copy_loop(tls_state_t *tls, unsigned flags)
 {
 	int inbuf_size;
 	const int INBUF_STEP = 4 * 1024;
@@ -1762,6 +1762,8 @@ void FAST_FUNC tls_run_copy_loop(tls_state_t *tls)
 				 */
 				pfds[0].fd = -1;
 				tls_free_outbuf(tls); /* mem usage optimization */
+				if (flags & TLSLOOP_EXIT_ON_LOCAL_EOF)
+					break;
 			} else {
 				if (nread == inbuf_size) {
 					/* TLS has per record overhead, if input comes fast,
diff --git a/networking/wget.c b/networking/wget.c
index 9300fa30b..daa728a9d 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -48,6 +48,7 @@
 //config:
 //config:config FEATURE_WGET_HTTPS
 //config:	bool "Support HTTPS using internal TLS code"
+//it also enables FTPS support, but it's not well tested yet
 //config:	default y
 //config:	depends on WGET
 //config:	select TLS
@@ -176,6 +177,9 @@ struct host_info {
 static const char P_FTP[] ALIGN1 = "ftp";
 static const char P_HTTP[] ALIGN1 = "http";
 #if SSL_SUPPORTED
+# if ENABLE_FEATURE_WGET_HTTPS
+static const char P_FTPS[] ALIGN1 = "ftps";
+# endif
 static const char P_HTTPS[] ALIGN1 = "https";
 #endif
 
@@ -484,6 +488,12 @@ static void parse_url(const char *src_url, struct host_info *h)
 			h->port = bb_lookup_port(P_FTP, "tcp", 21);
 		} else
 #if SSL_SUPPORTED
+# if ENABLE_FEATURE_WGET_HTTPS
+		if (strcmp(url, P_FTPS) == 0) {
+			h->port = bb_lookup_port(P_FTPS, "tcp", 990);
+			h->protocol = P_FTPS;
+		} else
+# endif
 		if (strcmp(url, P_HTTPS) == 0) {
 			h->port = bb_lookup_port(P_HTTPS, "tcp", 443);
 			h->protocol = P_HTTPS;
@@ -678,7 +688,7 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
 #endif
 
 #if ENABLE_FEATURE_WGET_HTTPS
-static void spawn_ssl_client(const char *host, int network_fd)
+static void spawn_ssl_client(const char *host, int network_fd, int flags)
 {
 	int sp[2];
 	int pid;
@@ -703,17 +713,19 @@ static void spawn_ssl_client(const char *host, int network_fd)
 			tls_state_t *tls = new_tls_state();
 			tls->ifd = tls->ofd = network_fd;
 			tls_handshake(tls, servername);
-			tls_run_copy_loop(tls);
+			tls_run_copy_loop(tls, flags);
 			exit(0);
 		} else {
-			char *argv[5];
+			char *argv[6];
+
 			xmove_fd(network_fd, 3);
 			argv[0] = (char*)"ssl_client";
 			argv[1] = (char*)"-s3";
 			//TODO: if (!is_ip_address(servername))...
 			argv[2] = (char*)"-n";
 			argv[3] = servername;
-			argv[4] = NULL;
+			argv[4] = (flags & TLSLOOP_EXIT_ON_LOCAL_EOF ? (char*)"-e" : NULL);
+			argv[5] = NULL;
 			BB_EXECVP(argv[0], argv);
 			bb_perror_msg_and_die("can't execute '%s'", argv[0]);
 		}
@@ -737,6 +749,11 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
 		target->user = xstrdup("anonymous:busybox@");
 
 	sfp = open_socket(lsa);
+#if ENABLE_FEATURE_WGET_HTTPS
+	if (target->protocol == P_FTPS)
+		spawn_ssl_client(target->host, fileno(sfp), TLSLOOP_EXIT_ON_LOCAL_EOF);
+#endif
+
 	if (ftpcmd(NULL, NULL, sfp) != 220)
 		bb_error_msg_and_die("%s", sanitize_string(G.wget_buf + 4));
 
@@ -794,6 +811,10 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
 
 	*dfpp = open_socket(lsa);
 
+	//For encrypted data, need to send "PROT P" and get "200 PROT now Private" response first
+	//Without it (or with "PROT C"), data is sent unencrypted
+	//spawn_ssl_client(target->host, fileno(*dfpp), /*flags*/ 0);
+
 	if (G.beg_range != 0) {
 		sprintf(G.wget_buf, "REST %"OFF_FMT"u", G.beg_range);
 		if (ftpcmd(G.wget_buf, NULL, sfp) == 350)
@@ -981,7 +1002,7 @@ static void download_one_url(const char *url)
 	/* Use the proxy if necessary */
 	use_proxy = (strcmp(G.proxy_flag, "off") != 0);
 	if (use_proxy) {
-		proxy = getenv(target.protocol == P_FTP ? "ftp_proxy" : "http_proxy");
+		proxy = getenv(target.protocol[0] == 'f' ? "ftp_proxy" : "http_proxy");
 //FIXME: what if protocol is https? Ok to use http_proxy?
 		use_proxy = (proxy && proxy[0]);
 		if (use_proxy)
@@ -1042,7 +1063,7 @@ static void download_one_url(const char *url)
 	/*G.content_len = 0; - redundant, got_clen = 0 is enough */
 	G.got_clen = 0;
 	G.chunked = 0;
-	if (use_proxy || target.protocol != P_FTP) {
+	if (use_proxy || target.protocol[0] != 'f' /*not ftp[s]*/) {
 		/*
 		 *  HTTP session
 		 */
@@ -1060,7 +1081,7 @@ static void download_one_url(const char *url)
 # if ENABLE_FEATURE_WGET_HTTPS
 			if (fd < 0) { /* no openssl? try internal */
 				sfp = open_socket(lsa);
-				spawn_ssl_client(server.host, fileno(sfp));
+				spawn_ssl_client(server.host, fileno(sfp), /*flags*/ 0);
 				goto socket_opened;
 			}
 # else
@@ -1077,7 +1098,7 @@ static void download_one_url(const char *url)
 		/* Only internal TLS support is configured */
 		sfp = open_socket(lsa);
 		if (target.protocol == P_HTTPS)
-			spawn_ssl_client(server.host, fileno(sfp));
+			spawn_ssl_client(server.host, fileno(sfp), /*flags*/ 0);
 #else
 		/* ssl (https) support is not configured */
 		sfp = open_socket(lsa);