CURLOPT_LOGIN_OPTIONS(3) Library Functions Manual CURLOPT_LOGIN_OPTIONS(3)
NAME
CURLOPT_LOGIN_OPTIONS - login options
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOGIN_OPTIONS, char *options);
DESCRIPTION
Pass a char pointer as parameter, which should be pointing to the
null-terminated options string to use for the transfer.
For more information about the login options please see RFC 2384, RFC
5092 and the IETF draft draft-earhart-url-smtp-00.txt.
CURLOPT_LOGIN_OPTIONS(3) can be used to set protocol specific login op-
tions, such as the preferred authentication mechanism via "AUTH=NTLM" or
"AUTH=*", and should be used in conjunction with the CURLOPT_USERNAME(3)
option.
Since 8.2.0, IMAP supports the login option "AUTH=+LOGIN". With this op-
tion, curl uses the plain (not SASL) LOGIN IMAP command even if the
server advertises SASL authentication. Care should be taken in using
this option, as it sends your password in plain text. This does not work
if the IMAP server disables the plain LOGIN (e.g. to prevent password
snooping).
The application does not have to keep the string around after setting
this option.
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.
DEFAULT
NULL
PROTOCOLS
This functionality affects imap, ldap, pop3 and smtp
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=*");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
HISTORY
Support for OpenLDAP added in 7.82.0.
AVAILABILITY
Added in curl 7.34.0
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_PASSWORD(3), CURLOPT_USERNAME(3)
libcurl 2026-07-12 CURLOPT_LOGIN_OPTIONS(3)
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