add passive mode option

usr.bin/ftp/cmds.c

@@ -1864,6 +1864,12 @@ LOOP:
 	return(new);
 }
 
+void setpassive(int argc, char **argv)
+{
+	code = togglevar(argc, argv, &passivemode,
+		verbose ? "Passive mode" : (char *)NULL);
+}
+
 void setsunique (int argc, char **argv)
 {
 	code = togglevar(argc, argv, &sunique, "Store unique");

usr.bin/ftp/cmds.h

@@ -10,6 +10,7 @@ void     setbell        (int argc, char **argv);
 void     settrace       (int argc, char **argv);
 void     sethash        (int argc, char **argv);
 void     setverbose     (int argc, char **argv);
+void     setpassive     (int argc, char **argv);
 void     setport        (int argc, char **argv);
 void     setprompt      (int argc, char **argv);
 void     setglob        (int argc, char **argv);

usr.bin/ftp/cmdtab.c

@@ -49,6 +49,7 @@ char	newerhelp[] =	"get file if remote file is newer than local file ";
 char	nlisthelp[] =	"nlist contents of remote directory";
 char	nmaphelp[] =	"set templates for default file name mapping";
 char	ntranshelp[] =	"set translation table for default file name mapping";
+char	passivehelp[] =	"enter passive transfer mode";
 char	porthelp[] =	"toggle use of PORT cmd for each data connection";
 char	prompthelp[] =	"force interactive prompting on multiple commands";
 char	proxyhelp[] =	"issue command on alternate connection";
@@ -122,6 +123,7 @@ struct cmd cmdtab[] = {
 	{ "nlist",	 nlisthelp,	1,	1,	1,	ls },
 	{ "ntrans",	 ntranshelp,	0,	0,	1,	setntrans },
 	{ "open",	 connecthelp,	0,	0,	1,	setpeer },
+	{ "passive",	 passivehelp,	0,	0,	0,	setpassive },
 	{ "prompt",	 prompthelp,	0,	0,	0,	setprompt },
 	{ "proxy",	 proxyhelp,	0,	0,	1,	doproxy },
 	{ "sendport",	 porthelp,	0,	0,	0,	setport },

usr.bin/ftp/ftp.var.h

@@ -61,6 +61,7 @@ extern int	mapflag;		/* use mapin mapout templates on file names */
 extern int	code;			/* return/reply code for ftp command */
 extern int	crflag;			/* if 1, strip car. rets. on ascii gets */
 extern char	pasv[64];		/* passive port for proxy data connection */
+extern int	passivemode;		/* passive mode enabled */
 extern char	*altarg;		/* argv[1] with no shell-like preprocessing  */
 extern char	ntin[17];		/* input translation table */
 extern char	ntout[17];		/* output translation table */

usr.bin/ftp/main.c

@@ -53,6 +53,7 @@ static char homedir[MAXPATHLEN];
 	doglob = 1;
 	interactive = 1;
 	autologin = 1;
+	passivemode = 1;
 	argc--, argv++;
 	while (argc > 0 && **argv == '-') {
 		for (cp = *argv + 1; *cp; cp++)