aredn/patches/704-enable-telnet.patch

--- a/package/base-files/files/lib/preinit/99_10_failsafe_login
+++ b/package/base-files/files/lib/preinit/99_10_failsafe_login
@@ -3,8 +3,7 @@
 # Copyright (C) 2010 Vertical Communications
 
 failsafe_netlogin () {
-	dropbearkey -t rsa -s 1024 -f /tmp/dropbear_failsafe_host_key
-	dropbear -r /tmp/dropbear_failsafe_host_key <> /dev/null 2>&1
+	telnetd -l /bin/login.sh <> /dev/null 2>&1
 }
 
 failsafe_shell() {
--- a/package/utils/busybox/Config-defaults.in
+++ b/package/utils/busybox/Config-defaults.in
@@ -2480,10 +2480,10 @@ config BUSYBOX_DEFAULT_UDPSVD
 	default n
 config BUSYBOX_DEFAULT_TELNET
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FEATURE_TELNET_TTYPE
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FEATURE_TELNET_AUTOLOGIN
 	bool
 	default n
@@ -2492,10 +2492,10 @@ config BUSYBOX_DEFAULT_FEATURE_TELNET_WI
 	default n
 config BUSYBOX_DEFAULT_TELNETD
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FEATURE_TELNETD_STANDALONE
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FEATURE_TELNETD_INETD_WAIT
 	bool
 	default n
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -110,6 +110,8 @@ define Package/busybox/install
 ifneq ($(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_CROND),)
 	$(INSTALL_BIN) ./files/cron $(1)/etc/init.d/cron
 endif
+	$(INSTALL_BIN) ./files/telnet $(1)/etc/init.d/telnet
+	$(INSTALL_BIN) ./files/login.sh $(1)/bin/login.sh
 ifneq ($(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_NTPD),)
 	$(INSTALL_BIN) ./files/sysntpd $(1)/etc/init.d/sysntpd
 	$(INSTALL_BIN) ./files/ntpd-hotplug $(1)/usr/sbin/ntpd-hotplug
--- /dev/null
+++ b/package/utils/busybox/files/telnet
@@ -0,0 +1,33 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2006-2011 OpenWrt.org
+
+START=50
+
+USE_PROCD=1
+PROG=/usr/sbin/telnetd
+
+has_root_pwd() {
+	local pwd=$([ -f "$1" ] && cat "$1")
+	      pwd="${pwd#*root:}"
+	      pwd="${pwd%%:*}"
+
+	test -n "${pwd#[\!x]}"
+}
+
+get_root_home() {
+	local homedir=$([ -f "$1" ] && cat "$1")
+	homedir="${homedir#*:*:0:0:*:}"
+
+	echo "${homedir%%:*}"
+}
+
+has_ssh_pubkey() {
+	( /etc/init.d/dropbear enabled 2> /dev/null && grep -qs "^ssh-" /etc/dropbear/authorized_keys ) || \
+	( /etc/init.d/sshd enabled 2> /dev/null && grep -qs "^ssh-" "$(get_root_home /etc/passwd)"/.ssh/authorized_keys )
+}
+
+start_service() {
+		procd_open_instance
+		procd_set_param command "$PROG" -F -l /bin/login.sh
+		procd_close_instance
+}
--- /dev/null
+++ b/package/utils/busybox/files/login.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+# Copyright (C) 2006-2011 OpenWrt.org
+
+if ( ! grep -qs '^root:[!x]\?:' /etc/shadow || \
+     ! grep -qs '^root:[!x]\?:' /etc/passwd ) && \
+   [ -z "$FAILSAFE" ]
+then
+	echo "WARNING: passwords are sent unencrypted."
+	busybox login
+else
+cat << EOF
+ === IMPORTANT ============================
+  Use 'passwd' to set your login password
+  this will enable telnet login with password
+ ------------------------------------------
+EOF
+
+exec /bin/ash --login
+fi