wget: new option FEATURE_WGET_FTP to enable/disable FTP

Introduce a separate option FTPS_SUPPORTED instead of not obvious ENABLE_FEATURE_WGET_HTTPS.

function                                             old     new   delta
P_FTP                                                  4       -      -4
P_FTPS                                                 5       -      -5
reset_beg_range_to_zero                               41       -     -41
parse_url                                            431     366     -65
parse_pasv_epsv                                      154       -    -154
.rodata                                           115566  115408    -158
ftpcmd                                               204       -    -204
spawn_ssl_client                                     291       -    -291
wget_main                                           2998    2664    -334
------------------------------------------------------------------------------
(add/remove: 0/7 grow/shrink: 0/3 up/down: 0/-1256)         Total: -1256 bytes

Signed-off-by: Sergey Ponomarev <stokito@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 35 insertions, 15 deletions

diff --git a/networking/wget.c b/networking/wget.c
index e660c279c..3edc5f870 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -25,6 +25,13 @@
 //config:       default y
 //config:       depends on WGET
 //config:
+//config:config FEATURE_WGET_FTP
+//config:       bool "Enable FTP protocol (+1k)"
+//config:       default y
+//config:       depends on WGET
+//config:       help
+//config:       To support FTPS, enable FEATURE_WGET_HTTPS as well.
+//config:
 //config:config FEATURE_WGET_AUTHENTICATION
 //config:       bool "Enable HTTP authentication"
 //config:       default y
@@ -48,12 +55,12 @@
 //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
 //config:       help
 //config:       wget will use internal TLS code to connect to https:// URLs.
+//config:       It also enables FTPS support, but it's not well tested yet.
 //config:       Note:
 //config:       On NOMMU machines, ssl_helper applet should be available
 //config:       in the $PATH for this to work. Make sure to select that applet.
@@ -173,6 +180,7 @@
 
 
 #define SSL_SUPPORTED (ENABLE_FEATURE_WGET_OPENSSL || ENABLE_FEATURE_WGET_HTTPS)
+#define FTPS_SUPPORTED (ENABLE_FEATURE_WGET_FTP && ENABLE_FEATURE_WGET_HTTPS)
 
 struct host_info {
         char *allocated;
@@ -182,14 +190,16 @@ struct host_info {
         char       *host;
         int         port;
 };
-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
+#if ENABLE_FEATURE_WGET_FTP
+static const char P_FTP[] ALIGN1 = "ftp";
+#endif
+#if FTPS_SUPPORTED
+static const char P_FTPS[] ALIGN1 = "ftps";
+#endif
 
 #if ENABLE_FEATURE_WGET_LONG_OPTIONS
 /* User-specified headers prevent using our corresponding built-in headers.  */
@@ -482,6 +492,7 @@ static char fgets_trim_sanitize(FILE *fp, const char *fmt)
         return c;
 }
 
+#if ENABLE_FEATURE_WGET_FTP
 static int ftpcmd(const char *s1, const char *s2, FILE *fp)
 {
         int result;
@@ -507,6 +518,7 @@ static int ftpcmd(const char *s1, const char *s2, FILE *fp)
         G.wget_buf[3] = ' ';
         return result;
 }
+#endif
 
 static void parse_url(const char *src_url, struct host_info *h)
 {
@@ -515,30 +527,31 @@ static void parse_url(const char *src_url, struct host_info *h)
         free(h->allocated);
         h->allocated = url = xstrdup(src_url);
 
-        h->protocol = P_FTP;
+        h->protocol = P_HTTP;
         p = strstr(url, "://");
         if (p) {
                 *p = '\0';
                 h->host = p + 3;
+#if ENABLE_FEATURE_WGET_FTP
                 if (strcmp(url, P_FTP) == 0) {
                         h->port = bb_lookup_std_port(P_FTP, "tcp", 21);
+                        h->protocol = P_FTP;
                 } else
-#if SSL_SUPPORTED
-# if ENABLE_FEATURE_WGET_HTTPS
+#endif
+#if FTPS_SUPPORTED
                 if (strcmp(url, P_FTPS) == 0) {
                         h->port = bb_lookup_std_port(P_FTPS, "tcp", 990);
                         h->protocol = P_FTPS;
                 } else
-# endif
+#endif
+#if SSL_SUPPORTED
                 if (strcmp(url, P_HTTPS) == 0) {
                         h->port = bb_lookup_std_port(P_HTTPS, "tcp", 443);
                         h->protocol = P_HTTPS;
                 } else
 #endif
                 if (strcmp(url, P_HTTP) == 0) {
- http:
-                        h->port = bb_lookup_std_port(P_HTTP, "tcp", 80);
-                        h->protocol = P_HTTP;
+                        goto http;
                 } else {
                         *p = ':';
                         bb_error_msg_and_die("not an http or ftp url: %s", url);
@@ -546,7 +559,8 @@ static void parse_url(const char *src_url, struct host_info *h)
         } else {
                 // GNU wget is user-friendly and falls back to http://
                 h->host = url;
-                goto http;
+ http:
+                h->port = bb_lookup_std_port(P_HTTP, "tcp", 80);
         }
 
         // FYI:
@@ -796,6 +810,7 @@ static void spawn_ssl_client(const char *host, int network_fd, int flags)
 }
 #endif
 
+#if ENABLE_FEATURE_WGET_FTP
 static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa)
 {
         FILE *sfp;
@@ -803,7 +818,7 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
         int port;
 
         sfp = open_socket(lsa);
-#if ENABLE_FEATURE_WGET_HTTPS
+#if FTPS_SUPPORTED
         if (target->protocol == P_FTPS)
                 spawn_ssl_client(target->host, fileno(sfp), TLSLOOP_EXIT_ON_LOCAL_EOF);
 #endif
@@ -859,7 +874,7 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
 
         *dfpp = open_socket(lsa);
 
-#if ENABLE_FEATURE_WGET_HTTPS
+#if FTPS_SUPPORTED
         if (target->protocol == P_FTPS) {
                 /* "PROT P" enables encryption of data stream.
                  * Without it (or with "PROT C"), data is sent unencrypted.
@@ -885,6 +900,7 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
 
         return sfp;
 }
+#endif
 
 static void NOINLINE retrieve_file_data(FILE *dfp)
 {
@@ -1407,10 +1423,12 @@ However, in real world it was observed that some web servers
                 /* For HTTP, data is pumped over the same connection */
                 dfp = sfp;
         } else {
+#if ENABLE_FEATURE_WGET_FTP
                 /*
                  *  FTP session
                  */
                 sfp = prepare_ftp_session(&dfp, &target, lsa);
+#endif
         }
 
         free(lsa);
@@ -1428,6 +1446,7 @@ However, in real world it was observed that some web servers
                         fprintf(stderr, "remote file exists\n");
         }
 
+#if ENABLE_FEATURE_WGET_FTP
         if (dfp != sfp) {
                 /* It's ftp. Close data connection properly */
                 fclose(dfp);
@@ -1435,6 +1454,7 @@ However, in real world it was observed that some web servers
                         bb_error_msg_and_die("ftp error: %s", G.wget_buf);
                 /* ftpcmd("QUIT", NULL, sfp); - why bother? */
         }
+#endif
         fclose(sfp);
 
         free(server.allocated);