rofl0r / rofl0r/proxychains-ng

Why can't proxychains4 work in this case?

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Description

I configured proxychains4, but these lines of code doesn't work:

proxychains4 python -c "import os;os.system('curl baidu.com')"
proxychains4 apt update
proxychains4 pip install faker

However, the results of running the first 6 commands prove that the configuration of proxychains4 should be fine:

(base) root@test:~# curl baidu.com
curl: (6) Could not resolve host: baidu.com

(base) root@test:~# proxychains4 curl baidu.com
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  baidu.com:80  ...  OK
<html>
<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">
</html>

(base) root@test:~# python -c "import os;os.system('proxychains4 curl baidu.com')"
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  baidu.com:80  ...  OK
<html>
<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">
</html>

(base) root@test:~# proxychains4 python -c "import os;os.system('proxychains4 curl baidu.com')"
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  baidu.com:80  ...  OK
<html>
<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">
</html>

(base) root@test:~# git clone https://github.com/rofl0r/proxychains-ng.git
Cloning into 'proxychains-ng'...
fatal: unable to access 'https://github.com/rofl0r/proxychains-ng.git/': Could not resolve host: github.com

(base) root@test:~# proxychains4 git clone https://github.com/rofl0r/proxychains-ng.git
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] DLL init: proxychains-ng 4.14
Cloning into 'proxychains-ng'...
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  github.com:443  ...  OK
[proxychains] DLL init: proxychains-ng 4.14
remote: Enumerating objects: 1557, done.
remote: Counting objects: 100% (137/137), done.
remote: Compressing objects: 100% (66/66), done.
[proxychains] DLL init: proxychains-ng 4.14
remote: Total 1557 (delta 83), reused 81 (delta 67), pack-reused 1420
Receiving objects: 100% (1557/1557), 724.93 KiB | 1.66 MiB/s, done.
Resolving deltas: 100% (1025/1025), done.

(base) root@test:~# proxychains4 python -c "import os;os.system('curl baidu.com')"
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
curl: (6) Could not resolve host: baidu.com

(base) root@test:~# proxychains4 apt update
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
0% [Working][proxychains] Strict chain  ...  127.0.0.1:34567 [proxychains] Strict chain  ...  127.0.0.1:34567 [proxychains] Strict chain  ...  127.0.0.1:34567  ...  security.ubuntu.com:0  ...  archive.ubuntu.com:0  ...  developer.download.nvidia.com:0  ...  OK
 ...  OK
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  archive.ubuntu.com:0 [proxychains] Strict chain  ...  127.0.0.1:34567  ...  security.ubuntu.com:0  ...  OK
Ign:1 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  InRelease
0% [Connecting to archive.ubuntu.com (224.0.0.1)] [Connecting to security.ubuntu.com (224.0.0.1)][proxychains] Strict chain  ...  127.0.0.1:34567  ...  developer.download.nvidia.com:0  ...  OK
Err:2 http://archive.ubuntu.com/ubuntu focal InRelease
  Connection failed [IP: 224.0.0.1 0]
0% [Connecting to security.ubuntu.com (224.0.0.1)] [Connecting to developer.download.nvidia.com (224.0.0.1)] ...  archive.ubuntu.com:0  ...  OK
 ...  OK
Err:3 http://security.ubuntu.com/ubuntu focal-security InRelease
  Connection failed [IP: 224.0.0.1 0]
Err:4 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  Release
  Could not handshake: The TLS connection was non-properly terminated. [IP: 224.0.0.1 0]
0% [Connecting to archive.ubuntu.com (224.0.0.1)] ...  OK
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  archive.ubuntu.com:0  ...  OK
Err:5 http://archive.ubuntu.com/ubuntu focal-updates InRelease
  Connection failed [IP: 224.0.0.1 0]
0% [Working] ...  archive.ubuntu.com:0  ...  OK
[proxychains] Strict chain  ...  127.0.0.1:34567  ...  archive.ubuntu.com:0  ...  OK
Err:6 http://archive.ubuntu.com/ubuntu focal-backports InRelease
  Connection failed [IP: 224.0.0.1 0]
[proxychains] DLL init: proxychains-ng 4.14
[proxychains] DLL init: proxychains-ng 4.14
Reading package lists... Done
E: The repository 'https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

(base) root@test:~# proxychains4 pip install faker
[proxychains] config file found: /etc/proxychains4.conf
[proxychains] preloading /usr/lib/x86_64-linux-gnu/libproxychains.so.4
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe259eab970>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/faker/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe259eabc70>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/faker/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe259eabf10>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/faker/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe259e561f0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/faker/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7fe259e56280>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/faker/
ERROR: Could not find a version that satisfies the requirement faker (from versions: none)
ERROR: No matching distribution found for faker

vim /etc/proxychains4.conf

strict_chain
proxy_dns
remote_dns_subnet 224
tcp_read_time_out 15000
tcp_connect_time_out 8000

[ProxyList]
http 127.0.0.1 34567

I don't have this problem on other ubuntu. How should I look for the cause of this problem?

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with /etc/proxychains4.conf and reproduce the listed proxychains4 commands, including the Python, apt, and pip cases. Compare the same configuration and command results on the other Ubuntu system, then trace the differing DNS or connection behavior; done means identifying a reproducible cause and documenting the relevant environment or configuration difference.

Written by the indexing model from the issue text.

Assessment

Tech stack
python, shell, ubuntu
Domain
cli, networking, operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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