net/ddns-scripts/files/usr/lib/ddns/dynamic_dns_functions.sh

   1 # /usr/lib/dynamic_dns/dynamic_dns_functions.sh
   2 #
   3 # Written by Eric Paul Bishop, Janary 2008
   4 # Distributed under the terms of the GNU General Public License (GPL) version 2.0
   5 #
   6 # This script is (loosely) based on the one posted by exobyte in the forums here:
   7 # http://forum.openwrt.org/viewtopic.php?id=14040
   8
   9
  10
  11 . /etc/functions.sh
  12 include /lib/network
  13
  14
  15 #loads all options for a given package and section
  16 #also, sets all_option_variables to a list of the variable names
  17 load_all_config_options()
  18 {
  19         pkg_name="$1"
  20         section_id="$2"
  21
  22         ALL_OPTION_VARIABLES=""
  23         # this callback loads all the variables
  24         # in the section_id section when we do
  25         # config_load. We need to redefine
  26         # the option_cb for different sections
  27         # so that the active one isn't still active
  28         # after we're done with it.  For reference
  29         # the $1 variable is the name of the option
  30         # and $2 is the name of the section
  31         config_cb()
  32         {
  33                 if [ ."$2" = ."$section_id" ]; then
  34                         option_cb()
  35                         {
  36                                 ALL_OPTION_VARIABLES="$ALL_OPTION_VARIABLES $1"
  37                         }
  38                 else
  39                         option_cb() { return 0; }
  40                 fi
  41         }
  42
  43
  44         config_load "$pkg_name"
  45         for var in $ALL_OPTION_VARIABLES
  46         do
  47                 config_get "$var" "$section_id" "$var"
  48         done
  49 }
  50
  51
  52 get_current_ip()
  53 {
  54
  55         #if ip source is not defined, assume we want to get ip from wan
  56         if [ "$ip_source" != "interface" ] && [ "$ip_source" != "web" ] && [ "$ip_source" != "script" ]
  57         then
  58                 ip_source="network"
  59         fi
  60
  61         if [ "$ip_source" = "network" ]
  62         then
  63                 if [ -z "$ip_network" ]
  64                 then
  65                         ip_network="wan"
  66                 fi
  67                 scan_interfaces
  68                 config_load /var/state/network
  69                 config_get ip_interface $ip_network ifname
  70         fi
  71
  72         current_ip='';
  73         if [ "$ip_source" = "network" ] || [ "$ip_source" = "interface" ]
  74         then
  75                 current_ip=$(ifconfig $ip_interface | grep -o 'inet addr:[0-9.]*' | grep -o "$ip_regex")
  76         elif [ "$ip_source" = "script" ]
  77         then
  78                 # get ip from script
  79                 current_ip=$($ip_script)
  80         else
  81                 # get ip from web
  82                 # we check each url in order in ip_url variable, and if no ips are found we use dyndns ip checker
  83                 # ip is set to FIRST expression in page that matches the ip_regex regular expression
  84                 for addr in $ip_url
  85                 do
  86                         if [ -z "$current_ip" ]
  87                         then
  88                                 current_ip=$(echo $( wget -O - $addr 2>/dev/null) | grep -o "$ip_regex")
  89                         fi
  90                 done
  91
  92                 #here we hard-code the dyndns checkip url in case no url was specified
  93                 if [ -z "$current_ip" ]
  94                 then
  95                         current_ip=$(echo $( wget -O - http://checkip.dyndns.org 2>/dev/null) | grep -o "$ip_regex")
  96                 fi
  97         fi
  98
  99         echo "$current_ip"
 100 }
 101
 102
 103 verbose_echo()
 104 {
 105         if [ "$verbose_mode" = 1 ]
 106         then
 107                 echo $1
 108         fi
 109 }
 110
 111 start_daemon_for_all_ddns_sections()
 112 {
 113         local event_interface="$1"
 114
 115         SECTIONS=""
 116         config_cb()
 117         {
 118                 SECTIONS="$SECTIONS $2"
 119         }
 120         config_load "ddns"
 121
 122         for section in $SECTIONS
 123         do
 124                 local iface
 125                 config_get iface "$section" interface "wan"
 126                 [ "$iface" = "$event_interface" ] || continue
 127                 /usr/lib/ddns/dynamic_dns_updater.sh $section 0 > /dev/null 2>&1 &
 128         done
 129 }
 130
 131 monotonic_time()
 132 {
 133         local uptime
 134         read uptime < /proc/uptime
 135         echo "${uptime%%.*}"
 136 }