[php-src] Issue #24284: CURLOPT_PROXY is incorrectly using UNIX socket as proxy

Issue: https://github.com/php/php-src/issues/24284 Author: arishat ### Description The following code: ```php <?php // let's say curl URL points to https://example.com:1234 ... curl_setopt($ch,CURLOPT_VERBOSE,true); curl_setopt($ch,CURLOPT_PROXY,'localhost/tmp/socks-proxy.sock'); curl_setopt($ch,CURLOPT_PROXYTYPE,CURLPROXY_SOCKS5_HOSTNAME); ... var_dump(curl_exec($ch)); ``` Resulted in this output: ``` * Trying /tmp/socks-proxy.sock:0... * SOCKS5 connect to example.com:1234 (remotely resolved) * SOCKS5 request granted. * Connected to localhost/tmp/socks-proxy.sock () port 1080 * using HTTP/1.x * ALPN: curl offers h2,http/1.1 * Send failure: Broken pipe * TLS connect error: error:00000000:lib(0)::reason(0) * OpenSSL SSL_connect: Broken pipe in connection to example.com:1234 * closing connection #0 bool(false) ``` But I expected this output instead: ``` < HTTP/2 200 < content-type: text/html string(10) "... ``` If I change it to normal IP:Port it works: curl_setopt($ch,CURLOPT_PROXY,'127.0.0.1:1081'); curl_setopt($ch,CURLOPT_PROXYTYPE,CURLPROXY_SOCKS5_HOSTNAME); * Trying 127.0.0.1:1080... * SOCKS5 request granted. ... < HTTP/2 200 < content-type: text/html string(10) "... **But I believe this is PHP bug** because the https://curl.se/libcurl/c/CURLOPT_PROXY.html clearly support this usage: ``` Unix domain sockets are supported for SOCKS proxies. Set localhost for the host part and append the absolute path to the domain socket. For example: socks5h://localhost/path/to/socket.sock ``` ### PHP Version ```plain PHP 8.4.26 (cli) ``` ### Operating System Linux