vislee / lua-resty-dns-server Goto Github PK

Hello guys. Is it possible to send authoritative answers with this software?

Issuing a dns request made with python scapy module got me this error:

runtime error: /usr/local/lib/lua/resty/dns/server.lua:245: bad argument #1 to 'lshift' (number expected, got nil)

dig baidu.com ANY +trace

dig 163.com ANY +trace

ipv6 地址简写 多了一个 "0"

完整地址: 2400:89c0:1022:0657:0000:0000:0152:0150 返回正常

dns:create_aaaa_answer("a.test.com", 100, "2400:89c0:1022:0657:0000:0000:0152:0150")

dig @127.0.0.1 a.test.com -p 2953 AAAA
a.test.com. 100 IN AAAA 2400:89c0:1022:657::152:150

简写地址: 2400:89c0:1022:657::152:150

dns:create_aaaa_answer("a.test.com", 100, "2400:89c0:1022:657::152:150")

dig @127.0.0.1 a.test.com -p 2953 AAAA
a.test.com. 100 IN AAAA 2400:89c0:1022:657::152:150:0

后面多了一个 "0"

@vislee

dns:create_aaaa_answer("a.test.com", 100, "2400:89c0:1022:0657:0000:0000:0152:0150")
dns:create_aaaa_answer("a.test.com", 100, "2400:89c0:1022:0657:0000:0000:0152:0151")
dns:create_aaaa_answer("a.test.com", 100, "2400:89c0:1022:0657:0000:0000:0152:0152")

只返回 一条

dig @127.0.0.1 a.test.com -p 2953 AAAA
a.test.com. 100 IN AAAA 2400:89c0:1022:657::152:150

@vislee

fengxin@fengxins-MacBook-Air ~ % dig -v DiG 9.9.3

start the lua-resty-dns-server on localhost

`fengxin@fengxins-MacBook-Air ~ % dig @localhost www.fengxin.com +client=159.138.88.145

; <<>> DiG 9.9.3 <<>> @localhost www.fengxin.com +client=159.138.88.145
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52034
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;www.fengxin.com. IN A

;; AUTHORITY SECTION:
www.fengxin.com. 600 IN NS 8.8.8.8.

;; Query time: 6 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jul 14 18:24:27 CST 2020
;; MSG SIZE rcvd: 69

fengxin@fengxins-MacBook-Air ~ % `

then this is ok!
and then lost +client paramter

`fengxin@fengxins-MacBook-Air ~ % dig @localhost www.fengxin.com

; <<>> DiG 9.9.3 <<>> @localhost www.fengxin.com
; (2 servers found)
;; global options: +cmd
;; connection timed out; no servers could be reached
fengxin@fengxins-MacBook-Air ~ %
`
then error log

2020/07/14 18:27:50 [error] 11074#1563068: *6 lua entry thread aborted: runtime error: ./commons/dns/server.lua:286: bad argument #1 to 'lshift' (number expected, got nil) stack traceback: coroutine 0: [C]: in function 'lshift' ./commons/dns/server.lua:286: in function 'decode_request' .../shareit-mcp-dns/model/service/resolution_dns_53_udp.lua:22: in main chunk, udp client: 127.0.0.1, server: 0.0.0.0:53

see the code with server.lua:286

local opt_code_hi, opt_code_lo = byte(self.buf, self.pos - 1, self.pos) local opt_code = lshift(opt_code_hi, 8) + opt_code_lo

the question ,I am lost the +client paramter when use dig, maybe maybu the dig think the edns paramter is null,so the server code 286 line opt_code_hi and opt_code_lo all is null?

do i need check the opt_code_hi and opt_code_lo is or not null in the server.lua

按readme 中Synopsis 的说明搭建
执行dig @127.0.0.1 www.taobao.com 出错
出错信息

2019/11/28 18:53:11 [error] 503566#503566: *10 lua entry thread aborted: runtime error: /usr/local/openresty/lualib/resty/dns/server.lua:286: bad argument #1 to 'lshift' (number expected, got nil)
stack traceback:
coroutine 0:
	[C]: in function 'lshift'
	/usr/local/openresty/lualib/resty/dns/server.lua:286: in function 'decode_request'
	content_by_lua(dns.conf:60):16: in main chunk, udp client: 127.0.0.1, server: 0.0.0.0:53