applications/luci-app-ddns/luasrc/tools/ddns.lua

   1 -- Copyright 2014-2016 Christian Schoenebeck <christian dot schoenebeck at gmail dot com>
   2 -- Licensed to the public under the Apache License 2.0.
   3
   4 module("luci.tools.ddns", package.seeall)
   5
   6 local NX   = require "nixio"
   7 local NXFS = require "nixio.fs"
   8 local OPKG = require "luci.model.ipkg"
   9 local UCI  = require "luci.model.uci"
  10 local SYS  = require "luci.sys"
  11 local UTIL = require "luci.util"
  12
  13 local function _check_certs()
  14         local _, v = NXFS.glob("/etc/ssl/certs/*.crt")
  15         if ( v == 0 ) then _, v = NXFS.glob("/etc/ssl/certs/*.pem") end
  16         return (v > 0)
  17 end
  18
  19 has_wgetssl     = (SYS.call( [[which wget-ssl >/dev/null 2>&1]] ) == 0) -- and true or nil
  20 has_curl        = (SYS.call( [[which curl >/dev/null 2>&1]] ) == 0)
  21 has_curlssl     = (SYS.call( [[$(which curl) -V 2>&1 | grep "Protocols:" | grep -qF "https"]] ) ~= 0)
  22 has_curlpxy     = (SYS.call( [[grep -i "all_proxy" /usr/lib/libcurl.so* >/dev/null 2>&1]] ) == 0)
  23 has_fetch       = (SYS.call( [[which uclient-fetch >/dev/null 2>&1]] ) == 0)
  24 has_fetchssl    = NXFS.access("/lib/libustream-ssl.so")
  25 has_bbwget      = (SYS.call( [[$(which wget) -V 2>&1 | grep -iqF "busybox"]] ) == 0)
  26 has_bindhost    = (SYS.call( [[which host >/dev/null 2>&1]] ) == 0)
  27                 or (SYS.call( [[which khost >/dev/null 2>&1]] ) == 0)
  28                 or (SYS.call( [[which drill >/dev/null 2>&1]] ) == 0)
  29 has_hostip      = (SYS.call( [[which hostip >/dev/null 2>&1]] ) == 0)
  30 has_nslookup    = (SYS.call( [[$(which nslookup) localhost 2>&1 | grep -qF "(null)"]] ) ~= 0)
  31 has_ipv6        = (NXFS.access("/proc/net/ipv6_route") and NXFS.access("/usr/sbin/ip6tables"))
  32 has_ssl         = (has_wgetssl or has_curlssl or (has_fetch and has_fetchssl))
  33 has_proxy       = (has_wgetssl or has_curlpxy or has_fetch or has_bbwget)
  34 has_forceip     = ((has_wgetssl or has_curl or has_fetch) and (has_bindhost or has_hostip))
  35 has_dnsserver   = (has_bindhost or has_hostip or has_nslookup)
  36 has_bindnet     = (has_wgetssl or has_curl)
  37 has_cacerts     = _check_certs()
  38
  39 -- function to calculate seconds from given interval and unit
  40 function calc_seconds(interval, unit)
  41         if not tonumber(interval) then
  42                 return nil
  43         elseif unit == "days" then
  44                 return (tonumber(interval) * 86400)     -- 60 sec * 60 min * 24 h
  45         elseif unit == "hours" then
  46                 return (tonumber(interval) * 3600)      -- 60 sec * 60 min
  47         elseif unit == "minutes" then
  48                 return (tonumber(interval) * 60)        -- 60 sec
  49         elseif unit == "seconds" then
  50                 return tonumber(interval)
  51         else
  52                 return nil
  53         end
  54 end
  55
  56 -- convert epoch date to given format
  57 function epoch2date(epoch, format)
  58         if not format or #format < 2 then
  59                 local uci = UCI.cursor()
  60                 format    = uci:get("ddns", "global", "date_format") or "%F %R"
  61                 uci:unload("ddns")
  62         end
  63         format = format:gsub("%%n", "<br />")   -- replace newline
  64         format = format:gsub("%%t", "    ")     -- replace tab
  65         return os.date(format, epoch)
  66 end
  67
  68 -- read lastupdate from [section].update file
  69 function get_lastupd(section)
  70         local uci     = UCI.cursor()
  71         local run_dir = uci:get("ddns", "global", "run_dir") or "/var/run/ddns"
  72         local etime   = tonumber(NXFS.readfile("%s/%s.update" % { run_dir, section } ) or 0 )
  73         uci:unload("ddns")
  74         return etime
  75 end
  76
  77 -- read PID from run file and verify if still running
  78 function get_pid(section)
  79         local uci     = UCI.cursor()
  80         local run_dir = uci:get("ddns", "global", "run_dir") or "/var/run/ddns"
  81         local pid     = tonumber(NXFS.readfile("%s/%s.pid" % { run_dir, section } ) or 0 )
  82         if pid > 0 and not NX.kill(pid, 0) then
  83                 pid = 0
  84         end
  85         uci:unload("ddns")
  86         return pid
  87 end
  88
  89 -- replacement of build-in read of UCI option
  90 -- modified AbstractValue.cfgvalue(self, section) from cbi.lua
  91 -- needed to read from other option then current value definition
  92 function read_value(self, section, option)
  93         local value
  94         if self.tag_error[section] then
  95                 value = self:formvalue(section)
  96         else
  97                 value = self.map:get(section, option)
  98         end
  99
 100         if not value then
 101                 return nil
 102         elseif not self.cast or self.cast == type(value) then
 103                 return value
 104         elseif self.cast == "string" then
 105                 if type(value) == "table" then
 106                         return value[1]
 107                 end
 108         elseif self.cast == "table" then
 109                 return { value }
 110         end
 111 end
 112
 113 -- replacement of build-in parse of "Value"
 114 -- modified AbstractValue.parse(self, section, novld) from cbi.lua
 115 -- validate is called if rmempty/optional true or false
 116 -- before write check if forcewrite, value eq default, and more
 117 function value_parse(self, section, novld)
 118         local fvalue = self:formvalue(section)
 119         local fexist = ( fvalue and (#fvalue > 0) )     -- not "nil" and "not empty"
 120         local cvalue = self:cfgvalue(section)
 121         local rm_opt = ( self.rmempty or self.optional )
 122         local eq_cfg                                    -- flag: equal cfgvalue
 123
 124         -- If favlue and cvalue are both tables and have the same content
 125         -- make them identical
 126         if type(fvalue) == "table" and type(cvalue) == "table" then
 127                 eq_cfg = (#fvalue == #cvalue)
 128                 if eq_cfg then
 129                         for i=1, #fvalue do
 130                                 if cvalue[i] ~= fvalue[i] then
 131                                         eq_cfg = false
 132                                 end
 133                         end
 134                 end
 135                 if eq_cfg then
 136                         fvalue = cvalue
 137                 end
 138         end
 139
 140         -- removed parameter "section" from function call because used/accepted nowhere
 141         -- also removed call to function "transfer"
 142         local vvalue, errtxt = self:validate(fvalue)
 143
 144         -- error handling; validate return "nil"
 145         if not vvalue then
 146                 if novld then           -- and "novld" set
 147                         return          -- then exit without raising an error
 148                 end
 149
 150                 if fexist then          -- and there is a formvalue
 151                         self:add_error(section, "invalid", errtxt or self.title .. ": invalid")
 152                         return          -- so data are invalid
 153                 elseif not rm_opt then  -- and empty formvalue but NOT (rmempty or optional) set
 154                         self:add_error(section, "missing", errtxt or self.title .. ": missing")
 155                         return          -- so data is missing
 156                 elseif errtxt then
 157                         self:add_error(section, "invalid", errtxt)
 158                         return
 159                 end
 160 --              error  ("\n option: " .. self.option ..
 161 --                      "\n fvalue: " .. tostring(fvalue) ..
 162 --                      "\n fexist: " .. tostring(fexist) ..
 163 --                      "\n cvalue: " .. tostring(cvalue) ..
 164 --                      "\n vvalue: " .. tostring(vvalue) ..
 165 --                      "\n vexist: " .. tostring(vexist) ..
 166 --                      "\n rm_opt: " .. tostring(rm_opt) ..
 167 --                      "\n eq_cfg: " .. tostring(eq_cfg) ..
 168 --                      "\n eq_def: " .. tostring(eq_def) ..
 169 --                      "\n novld : " .. tostring(novld) ..
 170 --                      "\n errtxt: " .. tostring(errtxt) )
 171         end
 172
 173         -- lets continue with value returned from validate
 174         eq_cfg  = ( vvalue == cvalue )                                  -- update equal_config flag
 175         local vexist = ( vvalue and (#vvalue > 0) ) and true or false   -- not "nil" and "not empty"
 176         local eq_def = ( vvalue == self.default )                       -- equal_default flag
 177
 178         -- (rmempty or optional) and (no data or equal_default)
 179         if rm_opt and (not vexist or eq_def) then
 180                 if self:remove(section) then            -- remove data from UCI
 181                         self.section.changed = true     -- and push events
 182                 end
 183                 return
 184         end
 185
 186         -- not forcewrite and no changes, so nothing to write
 187         if not self.forcewrite and eq_cfg then
 188                 return
 189         end
 190
 191         -- we should have a valid value here
 192         assert (vvalue, "\n option: " .. self.option ..
 193                         "\n fvalue: " .. tostring(fvalue) ..
 194                         "\n fexist: " .. tostring(fexist) ..
 195                         "\n cvalue: " .. tostring(cvalue) ..
 196                         "\n vvalue: " .. tostring(vvalue) ..
 197                         "\n vexist: " .. tostring(vexist) ..
 198                         "\n rm_opt: " .. tostring(rm_opt) ..
 199                         "\n eq_cfg: " .. tostring(eq_cfg) ..
 200                         "\n eq_def: " .. tostring(eq_def) ..
 201                         "\n errtxt: " .. tostring(errtxt) )
 202
 203         -- write data to UCI; raise event only on changes
 204         if self:write(section, vvalue) and not eq_cfg then
 205                 self.section.changed = true
 206         end
 207 end
 208
 209 -----------------------------------------------------------------------------
 210 -- copied from https://svn.nmap.org/nmap/nselib/url.lua
 211 -- @author Diego Nehab
 212 -- @author Eddie Bell <ejlbell@gmail.com>
 213 --[[
 214     URI parsing, composition and relative URL resolution
 215     LuaSocket toolkit.
 216     Author: Diego Nehab
 217     RCS ID: $Id: url.lua,v 1.37 2005/11/22 08:33:29 diego Exp $
 218     parse_query and build_query added For nmap (Eddie Bell <ejlbell@gmail.com>)
 219 ]]--
 220 ---
 221 -- Parses a URL and returns a table with all its parts according to RFC 2396.
 222 --
 223 -- The following grammar describes the names given to the URL parts.
 224 -- <code>
 225 -- <url> ::= <scheme>://<authority>/<path>;<params>?<query>#<fragment>
 226 -- <authority> ::= <userinfo>@<host>:<port>
 227 -- <userinfo> ::= <user>[:<password>]
 228 -- <path> :: = {<segment>/}<segment>
 229 -- </code>
 230 --
 231 -- The leading <code>/</code> in <code>/<path></code> is considered part of
 232 -- <code><path></code>.
 233 -- @param url URL of request.
 234 -- @param default Table with default values for each field.
 235 -- @return A table with the following fields, where RFC naming conventions have
 236 --   been preserved:
 237 --     <code>scheme</code>, <code>authority</code>, <code>userinfo</code>,
 238 --     <code>user</code>, <code>password</code>, <code>host</code>,
 239 --     <code>port</code>, <code>path</code>, <code>params</code>,
 240 --     <code>query</code>, and <code>fragment</code>.
 241 -----------------------------------------------------------------------------
 242 function parse_url(url) --, default)
 243         -- initialize default parameters
 244         local parsed = {}
 245 --      for i,v in base.pairs(default or parsed) do
 246 --              parsed[i] = v
 247 --      end
 248
 249         -- remove whitespace
 250 --      url = string.gsub(url, "%s", "")
 251         -- get fragment
 252         url = string.gsub(url, "#(.*)$",
 253                 function(f)
 254                         parsed.fragment = f
 255                         return ""
 256                 end)
 257         -- get scheme. Lower-case according to RFC 3986 section 3.1.
 258         url = string.gsub(url, "^([%w][%w%+%-%.]*)%:",
 259                 function(s)
 260                         parsed.scheme = string.lower(s);
 261                         return ""
 262                 end)
 263         -- get authority
 264         url = string.gsub(url, "^//([^/]*)",
 265                 function(n)
 266                         parsed.authority = n
 267                         return ""
 268                 end)
 269         -- get query stringing
 270         url = string.gsub(url, "%?(.*)",
 271                 function(q)
 272                         parsed.query = q
 273                         return ""
 274                 end)
 275         -- get params
 276         url = string.gsub(url, "%;(.*)",
 277                 function(p)
 278                         parsed.params = p
 279                         return ""
 280                 end)
 281         -- path is whatever was left
 282         parsed.path = url
 283
 284         local authority = parsed.authority
 285         if not authority then
 286                 return parsed
 287         end
 288         authority = string.gsub(authority,"^([^@]*)@",
 289                 function(u)
 290                         parsed.userinfo = u;
 291                         return ""
 292                 end)
 293         authority = string.gsub(authority, ":([0-9]*)$",
 294                 function(p)
 295                         if p ~= "" then
 296                                 parsed.port = p
 297                         end;
 298                         return ""
 299                 end)
 300         if authority ~= "" then
 301                 parsed.host = authority
 302         end
 303
 304         local userinfo = parsed.userinfo
 305         if not userinfo then
 306                 return parsed
 307         end
 308         userinfo = string.gsub(userinfo, ":([^:]*)$",
 309                 function(p)
 310                         parsed.password = p;
 311                         return ""
 312                 end)
 313         parsed.user = userinfo
 314         return parsed
 315 end