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CURLOPT_FTPSSLAUTH(3) Library Functions Manual CURLOPT_FTPSSLAUTH(3) NAME CURLOPT_FTPSSLAUTH - order in which to attempt TLS vs SSL SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPSSLAUTH, long order); DESCRIPTION Pass a long using one of the values from below, to alter how libcurl issues "AUTH TLS" or "AUTH SSL" when FTP over SSL is activated. This is only in- teresting if CURLOPT_USE_SSL(3) is also set. Possible order values: CURLFTPAUTH_DEFAULT Allow libcurl to decide. CURLFTPAUTH_SSL Try "AUTH SSL" first, and only if that fails try "AUTH TLS". CURLFTPAUTH_TLS Try "AUTH TLS" first, and only if that fails try "AUTH SSL". DEFAULT CURLFTPAUTH_DEFAULT PROTOCOLS This functionality affects ftp only EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt"); curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY); /* funny server, ask for SSL before TLS */ curl_easy_setopt(curl, CURLOPT_FTPSSLAUTH, CURLFTPAUTH_SSL); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY CURLFTPAUTH_* enums became long types in 8.16.0, prior to this version a long cast was necessary when passed to curl_easy_setopt(3). AVAILABILITY Added in curl 7.12.2 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_FTP_SSL_CCC(3), CURLOPT_USE_SSL(3) libcurl 2026-06-11 CURLOPT_FTPSSLAUTH(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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