tcpdns没有成功过 about redsocks HOT 10 CLOSED

你用的是哪个版本的？ malformed的问题最新版应该是修复了的。 TImeout这个应该是真的超时的。TCP DNS
在国内确实不好用。建议试试新轮子 cdns ，好用很多，如果你不是很霉的话。

2016年10月16日 12:33，"ekenchan" [email protected]写道：

配置tcpdns之后，用dig测试请求总是报malformed DNS request，用nslookup测试总是报errno(150),
what: READING|0|0|0|TIMEOUT|0|0x0: Operation now in progress，太难用了

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@semigodking release-0.65

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这个版本号看不出来，已经很长时间没升级版本号了，是该考虑升一下了。要用最新版。

2016年10月16日 15:30，"ekenchan" [email protected]写道：

@semigodking https://github.com/semigodking release-0.65

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我在本地用git clone拿了最新版，编译之后用4个8作为tcpdns上游，dig还是返回malformed DNS request，用nslookup是报drop request。但是本地直接用dig @8.8.8.8 +tcp是有正确结果的

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什么平台？能抓点包和log给我看看不？如果你只是想解决问题的话，把tcpdns.c 的304到307行的条件直接改成
if (1) 即可。这条件检查其实意义不大。

2016年10月16日 18:35，"ekenchan" [email protected]写道：

我在本地用git clone拿了最新版，编译之后用4个8作为tcpdns上游，dig还是返回malformed DNS
request，用nslookup是报drop request。但是本地直接用dig @8.8.8.8 +tcp是有正确结果的

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我在cygwin下编译的，之前在centos交叉编译了mips版也是一样

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刚试了一下，没有问题啊。x86 centos

`[abc@default redsocks2]$ cat tcpdns.conf
base {
log_debug = on;
log_info = on;
daemon = off;
redirector= iptables;
}
tcpdns {
local_ip = 127.0.0.1; // Local server to act as DNS server
local_port = 1053; // UDP port to receive UDP DNS requests
tcpdns2 = 8.8.8.8; // DNS server that supports TCP DNS requests
timeout = 4; // Timeout value for TCP DNS requests
}

[abc@default redsocks2]$ ./redsocks2 -c tcpdns.conf &
[1] 13820
[abc@default redsocks2]$ 1476673054.611729 tcpdns.c:476 tcpdns_init_instance(...) tcpdns @ 127.0.0.1:1053
1476673054.611758 main.c:229 main(...) redsocks started with: epoll

[abc@default redsocks2]$
[abc@default redsocks2]$ dig facebook.com @127.0.0.1 -p 1053
1476673063.448111 tcpdns.c:223 choose_tcpdns(...) Dealy of TCP DNS resolvers: 0, 0
1476673063.462420 tcpdns.c:108 tcpdns_readcb(...) [127.0.0.1:50069->127.0.0.1:1053]: response size: 48
1476673063.462474 tcpdns.c:78 tcpdns_drop_request(...) [127.0.0.1:50069->127.0.0.1:1053]: dropping request @ state: 2

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.2 <<>> facebook.com @127.0.0.1 -p 1053
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29351
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;facebook.com. IN A

;; ANSWER SECTION:
facebook.com. 28 IN A 31.13.65.36

;; Query time: 14 msec
;; SERVER: 127.0.0.1#1053(127.0.0.1)
;; WHEN: Mon Oct 17 10:57:43 2016
;; MSG SIZE rcvd: 46

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The last condition check against !req->data.header.arcount at line 307 is causing problem. Suggest to comment this line out by default.

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Fixed. Please open new issue of you still have similar issues.

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