From RDB: telnet can now start up in passive mode, in which it

doesn't do any negotiation until the remote side does.

[originally from svn r1107]

putty.h

@@ -196,6 +196,7 @@ typedef struct {
     char username[32];
     char localusername[32];
     int rfc_environ;
+    int passive_telnet;
     /* Keyboard options */
     int bksp_is_delete;
     int rxvt_homeend;

settings.c

@@ -86,6 +86,7 @@ void save_settings(char *section, int do_host, Config * cfg)
     write_setting_s(sesskey, "PublicKeyFile", cfg->keyfile);
     write_setting_s(sesskey, "RemoteCommand", cfg->remote_cmd);
     write_setting_i(sesskey, "RFCEnviron", cfg->rfc_environ);
+    write_setting_i(sesskey, "PassiveTelnet", cfg->passive_telnet);
     write_setting_i(sesskey, "BackspaceIsDelete", cfg->bksp_is_delete);
     write_setting_i(sesskey, "RXVTHomeEnd", cfg->rxvt_homeend);
     write_setting_i(sesskey, "LinuxFunctionKeys", cfg->funky_type);
@@ -248,6 +249,7 @@ void load_settings(char *section, int do_host, Config * cfg)
     gpps(sesskey, "RemoteCommand", "", cfg->remote_cmd,
 	 sizeof(cfg->remote_cmd));
     gppi(sesskey, "RFCEnviron", 0, &cfg->rfc_environ);
+    gppi(sesskey, "PassiveTelnet", 0, &cfg->passive_telnet);
     gppi(sesskey, "BackspaceIsDelete", 1, &cfg->bksp_is_delete);
     gppi(sesskey, "RXVTHomeEnd", 0, &cfg->rxvt_homeend);
     gppi(sesskey, "LinuxFunctionKeys", 0, &cfg->funky_type);

telnet.c

@@ -175,6 +175,7 @@ static struct Opt *opts[] = {
 };
 
 static int echoing = TRUE, editing = TRUE;
+static int activated = FALSE;
 
 static int in_synch;
 static int sb_opt, sb_len;
@@ -226,6 +227,23 @@ static void option_side_effects(struct Opt *o, int enabled)
     else if (o->option == TELOPT_SGA && o->send == DO)
 	editing = !enabled;
     ldisc_send(NULL, 0);	       /* cause ldisc to notice the change */
+
+    /* Ensure we get the minimum options */
+    if (!activated) {
+	if (o_echo.state == INACTIVE) {
+	    o_echo.state = REQUESTED;
+	    send_opt(o_echo.send, o_echo.option);
+	}
+	if (o_we_sga.state == INACTIVE) {
+	    o_we_sga.state = REQUESTED;
+	    send_opt(o_we_sga.send, o_we_sga.option);
+	}
+	if (o_they_sga.state == INACTIVE) {
+	    o_they_sga.state = REQUESTED;
+	    send_opt(o_they_sga.send, o_they_sga.option);
+	}
+	activated = TRUE;
+    }
 }
 
 static void activate_option(struct Opt *o)
@@ -603,12 +621,19 @@ static char *telnet_init(char *host, int port, char **realhost)
     /*
      * Initialise option states.
      */
-    {
+    if (cfg.passive_telnet) {
+	struct Opt **o;
+
+	for (o = opts; *o; o++)
+	    if ((*o)->state == REQUESTED)
+		(*o)->state = INACTIVE;
+    } else {
 	struct Opt **o;
 
 	for (o = opts; *o; o++)
 	    if ((*o)->state == REQUESTED)
 		send_opt((*o)->send, (*o)->option);
+	activated = TRUE;
     }
 
     /*

windlg.c

@@ -408,6 +408,9 @@ enum { IDCX_ABOUT =
     IDC_EMSTATIC,
     IDC_EMBSD,
     IDC_EMRFC,
+    IDC_ACTSTATIC,
+    IDC_TPASSIVE,
+    IDC_TACTIVE,
     telnetpanelend,
 
     rloginpanelstart,
@@ -658,6 +661,8 @@ static void init_dlg_ctrls(HWND hwnd)
     }
     CheckRadioButton(hwnd, IDC_EMBSD, IDC_EMRFC,
 		     cfg.rfc_environ ? IDC_EMRFC : IDC_EMBSD);
+    CheckRadioButton(hwnd, IDC_TPASSIVE, IDC_TACTIVE,
+		     cfg.passive_telnet ? IDC_TPASSIVE : IDC_TACTIVE);
 
     SetDlgItemText(hwnd, IDC_TTEDIT, cfg.termtype);
     SetDlgItemText(hwnd, IDC_LOGEDIT, cfg.username);
@@ -1102,7 +1107,7 @@ static void create_controls(HWND hwnd, int dlgtype, int panel)
     }
 
     if (panel == telnetpanelstart) {
-	/* The Telnet panel. Accelerators used: [acgo] svldr bf */
+	/* The Telnet panel. Accelerators used: [acgo] svldr bft */
 	struct ctlpos cp;
 	ctlposinit(&cp, hwnd, 80, 3, 13);
 	if (dlgtype == 0) {
@@ -1120,6 +1125,9 @@ static void create_controls(HWND hwnd, int dlgtype, int panel)
 	    radioline(&cp, "Handling of OLD_ENVIRON ambiguity:",
 		      IDC_EMSTATIC, 2, "&BSD (commonplace)", IDC_EMBSD,
 		      "R&FC 1408 (unusual)", IDC_EMRFC, NULL);
+	    radioline(&cp, "&Telnet negotiation mode:", IDC_ACTSTATIC, 2,
+		      "Passive", IDC_TPASSIVE, "Active",
+		      IDC_TACTIVE, NULL);
 	    endbox(&cp);
 	}
     }
@@ -1987,6 +1995,11 @@ static int GenericMainDlgProc(HWND hwnd, UINT msg,
 	      case IDC_EMRFC:
 		cfg.rfc_environ = IsDlgButtonChecked(hwnd, IDC_EMRFC);
 		break;
+	      case IDC_TPASSIVE:
+	      case IDC_TACTIVE:
+		cfg.passive_telnet =
+		    IsDlgButtonChecked(hwnd, IDC_TPASSIVE);
+		break;
 	      case IDC_ENVADD:
 		if (HIWORD(wParam) == BN_CLICKED ||
 		    HIWORD(wParam) == BN_DOUBLECLICKED) {