CURLOPT_SOCKS5_AUTH - methods for SOCKS5 proxy authentication

Added in curl 7.55.0

CURLAUTH_BASIC|CURLAUTH_GSSAPI

Pass a long as parameter, which is set to a bitmask, to tell libcurl which authentication method(s) are allowed for SOCKS5 proxy authentication. The only supported flags are CURLAUTH_BASIC, which allows username/password authentication, CURLAUTH_GSSAPI, which allows GSS-API authentication, and CURLAUTH_NONE, which allows no authentication. Set the actual username and password with the CURLOPT_PROXYUSERPWD(3) option.

int main(void) { CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* request to use a SOCKS5 proxy */ curl_easy_setopt(curl, CURLOPT_PROXY, "socks5://user:pass@myproxy.com"); /* enable username/password authentication only */ curl_easy_setopt(curl, CURLOPT_SOCKS5_AUTH, (long)CURLAUTH_BASIC); /* Perform the request */ curl_easy_perform(curl); } }

CURLOPT_SOCKS5_AUTH - methods for SOCKS5 proxy authentication

This functionality affects all supported protocols

curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

CURLOPT_PROXY(3), CURLOPT_PROXYTYPE(3) libcurl 2025-06-16 CURLOPT_SOCKS5_AUTH(3)

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS5_AUTH, long bitmask);