Use TXT queries, introduce switch-to*sh

CU2/handle-control-change.sh

@@ -4,10 +4,10 @@
 
 touch "${STATES_DIR}/updating"
 if [ -e "$DNSCRYPT_FILE" ]; then
-  ./switch-to-dnscrypt.sh
+  ./switch-to-dnscrypt-if-required.sh
 else
   ./stop-dnscrypt-proxy.sh
-  ./switch-to-dhcp.sh
+  ./switch-to-dhcp-if-required-.sh
 fi
 rm -f "${STATES_DIR}/updating"
 rm -f "${STATES_DIR}/update-request"

CU2/handle-network-change.sh

@@ -8,4 +8,4 @@ FALLBACK_FILE="${CONTROL_DIR}/fallback"
 ./check-network-change.sh || exit 0
 ./set-dns-to-dhcp.sh
 [ ! -e "$DNSCRYPT_FILE" ] && exit 0
-./switch-to-dnscrypt.sh
+./switch-to-dnscrypt-if-required.sh

CU2/start-dnscrypt-proxy.sh

@@ -30,8 +30,8 @@ try_resolver() {
     case "$line" in
       *Proxying\ from\ *)
         answers=$(exec dig +time=1 +short +tries=2 -p $priority \
-          @"$INTERFACE_PROBES" dailymotion.com 2> /dev/null | \
-          fgrep -v 67.215.65. | wc -l)
+          TXT @"$INTERFACE_PROBES" debug.opendns.com. 2> /dev/null | \
+          fgrep -ic 'dnscrypt enabled')
         [ -r "$pid_file" ] && kill $(cat -- "$pid_file")
         if [ $answers -gt 0 ]; then
           echo "$args" > "${RES_DIR}/${priority}"

CU2/switch-to-dhcp-if-required.sh

@@ -0,0 +1,7 @@
+#! /bin/sh
+
+. ./common.inc
+
+[ -e "$DNSCRYPT_FILE" ] && exit 0
+
+./set-dns-to-dhcp.sh

CU2/switch-to-dhcp.sh

@@ -2,6 +2,5 @@
 
 . ./common.inc
 
-[ -e "$DNSCRYPT_FILE" ] && exit 0
-
-./set-dns-to-dhcp.sh
+rm -f "$DNSCRYPT_FILE"
+exec ./switch-to-dhcp-if-required.sh

CU2/switch-to-dnscrypt-if-required.sh

@@ -0,0 +1,30 @@
+#! /bin/ksh
+
+. ./common.inc
+
+PAUSE_MAX=10
+PAUSE_INCREMENT=0.1
+
+[ ! -e "$DNSCRYPT_FILE" ] && exit 0
+
+pause=0
+while :; do
+  if [ $pause -lt $PAUSE_MAX ]; then
+    pause=$((pause + $PAUSE_INCREMENT))
+  fi
+  sleep $pause  
+  ./check-hijacking.sh || continue
+  ./start-dnscrypt-proxy.sh || continue
+  ./check-local-dns.sh || continue
+  ./set-dns.sh "$INTERFACE_PROXY"
+  if [ $? != 0 ]; then
+    ./set-dns-to-dhcp.sh
+    continue
+  fi
+  ./check-hijacking.sh
+  if [ $? != 0 ]; then
+    ./set-dns-to-dhcp.sh
+    continue
+  fi
+  break
+done

CU2/switch-to-dnscrypt.sh

@@ -1,30 +1,6 @@
-#! /bin/ksh
+#! /bin/sh
 
 . ./common.inc
 
-PAUSE_MAX=10
-PAUSE_INCREMENT=0.1
-
-[ ! -e "$DNSCRYPT_FILE" ] && exit 0
-
-pause=0
-while :; do
-  if [ $pause -lt $PAUSE_MAX ]; then
-    pause=$((pause + $PAUSE_INCREMENT))
-  fi
-  sleep $pause  
-  ./check-hijacking.sh || continue
-  ./start-dnscrypt-proxy.sh || continue
-  ./check-local-dns.sh || continue
-  ./set-dns.sh "$INTERFACE_PROXY"
-  if [ $? != 0 ]; then
-    ./set-dns-to-dhcp.sh
-    continue
-  fi
-  ./check-hijacking.sh
-  if [ $? != 0 ]; then
-    ./set-dns-to-dhcp.sh
-    continue
-  fi
-  break
-done
+touch "$DNSCRYPT_FILE"
+exec ./switch-to-dnscrypt-if-required.sh