CURLOPT_SOCKS5_AUTH(3) Library Functions Manual CURLOPT_SOCKS5_AUTH(3)
NAME
CURLOPT_SOCKS5_AUTH - methods for SOCKS5 proxy authentication
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS5_AUTH, long bitmask);
DESCRIPTION
Pass a long as parameter, which is set to a bitmask, to tell libcurl
which authentication method(s) are allowed for SOCKS5 proxy authentica-
tion. The only supported flags are CURLAUTH_BASIC, which allows user-
name/password authentication, CURLAUTH_GSSAPI, which allows GSS-API au-
thentication, and CURLAUTH_NONE, which allows no authentication. Set the
actual username and password with the CURLOPT_PROXYUSERPWD(3) option.
DEFAULT
CURLAUTH_BASIC|CURLAUTH_GSSAPI
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
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);
}
}
AVAILABILITY
Added in curl 7.55.0
RETURN VALUE
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).
SEE ALSO
CURLOPT_PROXY(3), CURLOPT_PROXYTYPE(3)
libcurl 2026-07-12 CURLOPT_SOCKS5_AUTH(3)
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