Bad/Illegal format when use %00(Null characters) in GOPHER URL

[tarunkant]

I did this

I was running the following cURL command:

Step 1: Open a port 1234 from one terminal by running the following command:
ncat -lvp 1234

Step 2: From another terminal run the following cURL command:
curl 'gopher://127.0.0.1:1234/_%0012'

Result:
curl: (3) URL using bad/illegal format or missing URL

I expected the following

Run without error

curl/libcurl version

Tried on two versions of cURL
curl 7.79.1 (x86_64-apple-darwin21.0) libcurl/7.79.1 (SecureTransport) LibreSSL/3.3.5 zlib/1.2.11 nghttp2/1.45.1
curl 7.47.0 (arm-apple-darwin21.4.0) libcurl/7.79.1 (SecureTransport) LibreSSL/3.3.5 zlib/1.2.11 nghttp2/1.45.1

On both cURL version, I am getting the same error

operating system

MacOS Monterey, M1 chip

[bagder]

The way I read RFC 1436 section 4 nul bytes are not valid selectors for gopher. Are you saying they are?

[bagder]

On both cURL version, I am getting the same error

Both of them show the same libcurl version used, so there's no surprise they show the same error...

[tarunkant]

When testing on Linux with libcurl 7.47.0, it works with %00(Null) characters too.

[bagder]

What works? Are you downloading gopher URLs successfully with nul bytes in the selectors?

[tarunkant]

Yes, using libcurl/7.47.0. I can run this command curl 'gopher://127.0.0.1:1234/_%0012' without any error.

[bagder]

That's not what I'm asking though.

[bagder]

Are you downloading gopher URLs successfully with nul bytes in the selectors?

They are not allowed in the gopher RFC. Why are you insisting that curl should allow them?

[bagder]

Rejected since 31e5358