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开源软件名称（OpenSource Name）：vislee/lua-resty-dns-server开源软件地址(OpenSource Url)：https://github.com/vislee/lua-resty-dns-server开源编程语言(OpenSource Language)：Lua 98.2%开源软件介绍(OpenSource Introduction)：Namelua-resty-dns-server - Lua DNS server driver for the OpenResty Table of ContentsStatusThis library is still under early development and is still experimental. DescriptionThis Lua library provies a DNS server driver for the ngx_lua nginx module: https://github.com/openresty/stream-lua-nginx-module/#readme Synopsislua_package_path "/path/to/lua-resty-dns-server/lib/?.lua;;";
stream {
server {
listen 53 udp;
content_by_lua_block {
local server = require 'resty.dns.server'
local sock, err = ngx.req.socket()
if not sock then
ngx.log(ngx.ERR, "failed to get the request socket: ", err)
return ngx.exit(ngx.ERROR)
end
local req, err = sock:receive()
if not req then
ngx.log(ngx.ERR, "failed to receive: ", err)
return ngx.exit(ngx.ERROR)
end
local dns = server:new()
local request, err = dns:decode_request(req)
if not request then
ngx.log(ngx.ERR, "failed to decode request: ", err)
local resp = dns:encode_response()
local ok, err = sock:send(resp)
if not ok then
ngx.log(ngx.ERR, "failed to send: ", err)
ngx.exit(ngx.ERROR)
end
return
end
local query = request.questions[1]
ngx.log(ngx.DEBUG, "qname: ", query.qname, " qtype: ", query.qtype)
local subnet = request.subnet[1]
if subnet then
ngx.log(ngx.DEBUG, "subnet addr: ", subnet.address, " mask: ", subnet.mask, " family: ", subnet.family)
end
local cname = "sinacloud.com"
if query.qtype == server.TYPE_CNAME or
query.qtype == server.TYPE_AAAA or query.qtype == server.TYPE_A then
local err = dns:create_cname_answer(query.qname, 600, cname)
if err then
ngx.log(ngx.ERR, "failed to create cname answer: ", err)
return
end
else
dns:create_soa_answer("test.com", 600, "a.root-test.com", "vislee.test.com", 1515161223, 1800, 900, 604800, 86400)
end
local resp = dns:encode_response()
local ok, err = sock:send(resp)
if not ok then
ngx.log(ngx.ERR, "failed to send: ", err)
return
end
}
}
server {
listen 53;
content_by_lua_block {
local bit = require 'bit'
local lshift = bit.lshift
local rshift = bit.rshift
local band = bit.band
local byte = string.byte
local char = string.char
local server = require 'resty.dns.server'
local sock, err = ngx.req.socket()
if not sock then
ngx.log(ngx.ERR, "failed to get the request socket: ", err)
return ngx.exit(ngx.ERROR)
end
local buf, err = sock:receive(2)
if not buf then
ngx.log(ngx.ERR, "failed to receive: ", err)
return ngx.exit(ngx.ERROR)
end
local len_hi = byte(buf, 1)
local len_lo = byte(buf, 2)
local len = lshift(len_hi, 8) + len_lo
local data, err = sock:receive(len)
if not data then
ngx.log(ngx.ERR, "failed to receive: ", err)
return ngx.exit(ngx.ERROR)
end
local dns = server:new()
local request, err = dns:decode_request(data)
if not request then
ngx.log(ngx.ERR, "failed to decode dns request: ", err)
return
end
local query = request.questions[1]
ngx.log(ngx.DEBUG, "qname: ", query.qname, " qtype: ", query.qtype)
local subnet = request.subnet[1]
if subnet then
ngx.log(ngx.DEBUG, "subnet addr: ", subnet.address, " mask: ", subnet.mask, " family: ", subnet.family)
end
if query.qtype == server.TYPE_CNAME or query.qtype == server.TYPE_A then
dns:create_cname_answer(query.qname, 600, "sinacloud.com")
elseif query.qtype == server.TYPE_AAAA then
local resp_header, err = dns:create_response_header(server.RCODE_NOT_IMPLEMENTED)
resp_header.ra = 0
else
dns:create_soa_answer("test.com", 600, "a.root-test.com", "vislee.test.com", 1515161223, 1800, 900, 604800, 86400)
end
local resp = dns:encode_response()
local len = #resp
local len_hi = char(rshift(len, 8))
local len_lo = char(band(len, 0xff))
local ok, err = sock:send({len_hi, len_lo, resp})
if not ok then
ngx.log(ngx.ERR, "failed to send: ", err)
return
end
return
}
}
}
Methodsnew
Creates a dns.server object. Returns decode_request
Parse the DNS request. The request returned the lua table which takes some of the following fields:
create_a_answer
Create the A records. Returns
create_aaaa_answer
Create the AAAA records. Returns
create_cname_answer
Create the CNAME records. Returns
create_txt_answer
Create the txt records. Returns
create_ns_answer
Create the NS records. Returns
create_soa_answer
Create the SOA records. Returns
create_mx_answer
Create the MX records. Returns
create_srv_answer
Create the SRV records. Returns
create_response_header
encode_response
Encode the DNS answers. Returns an message string on response or ConstantsTYPE_AThe TYPE_NSThe TYPE_CNAMEThe TYPE_SOAThe TYPE_MXThe TYPE_TXTThe TYPE_AAAA
The TYPE_SRV
The See RFC 2782 for details. TYPE_ANY
The all resource record type, equal to the decimal number RCODE_FORMAT_ERRORRCODE_NOT_IMPLEMENTEDTODOAuthorwenqiang li(vislee) guocan xu(selboo) Copyright and LicenseThis module is licensed under the BSD license. Copyright (C) 2018-2019, by vislee. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. See Also
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