On Mon, Dec 04, 2023 at 09:23:16AM +0100, Nicolas George wrote: > Charles Curley (12023-12-03): > > True. None the less, there is at least one perfectly good use for > > telnet: testing connections to servers. > > Wrong. The telnet client is not entirely transparent, as the telnet > protocol defines an escape octet to introduce commands. > > If you want to test a network protocol, you should use a really > transparent client. Traditionally people use netcat (nc), but it handles > EOF approximatively. > > For that use, I strongly recommend socat. These days, even bash can do it: tomas@trotzki:~$ exec 3<>/dev/tcp/localhost/80 tomas@trotzki:~$ echo -ne "GET / HTTP/1.0\r\n\r\n" >&3 tomas@trotzki:~$ cat <&3 HTTP/1.0 200 OK Content-Type: text/html ETag: "3243577940" Last-Modified: Mon, 30 Oct 2017 17:09:28 GMT Content-Length: 3378 Connection: close Date: Mon, 04 Dec 2023 18:55:37 GMT Server: lighttpd/1.4.59 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> <html xmlns="http://www.w3.org/1999/xhtml";> <head> These days, even bash can do it: tomas@trotzki:~$ exec 3<>/dev/tcp/localhost/80 tomas@trotzki:~$ echo -ne "GET / HTTP/1.0\r\n\r\n" >&3 tomas@trotzki:~$ cat <&3 HTTP/1.0 200 OK Content-Type: text/html ETag: "3243577940" Last-Modified: Mon, 30 Oct 2017 17:09:28 GMT Content-Length: 3378 Connection: close Date: Mon, 04 Dec 2023 18:55:37 GMT Server: lighttpd/1.4.59 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> <html xmlns="http://www.w3.org/1999/xhtml";> <head> [... rest elided ...] ;-) (alas, it can't do TCP server, which is a pity) Cheers -- t
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