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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_USER- NAME(3) option. Since 8.2.0, IMAP supports the login option "AUTH=+LOGIN". With this option, 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 pass- word 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. CURLOPT_LOGIN_OPTIONS(3) is a login property, it does not change the security context. This means that this option changes how the login happens when a connection is created, but it does not affect which con- nections libcurl can reuse. libcurl may reuse a connection that was set up with a different options string; a different options string does not by itself prevent reuse. Connection reuse still depends on other con- nection properties matching, such as the protocol, hostname, port num- ber, credentials and other settings that affect the connection. DEFAULT NULL PROTOCOLS This functionality affects imap, ldap, pop3 and smtp EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/"); curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, "AUTH=*"); result = 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 2026-06-11 CURLOPT_LOGIN_OPTIONS(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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