CURLOPT_PROTOCOLS - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROTOCOLS, long bitmask);

This option is deprecated. We strongly recommend using CURLOPT_PROTOCOLS_STR(3) instead because this option cannot control all available protocols!

Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask limits what protocols libcurl may use in the transfer. This allows you to have a libcurl built to support a wide range of protocols but still limit specific transfers to only be allowed to use a subset of them. By default libcurl accepts all protocols it supports (CURLPROTO_ALL). See also CURLOPT_REDIR_PROTOCOLS(3).

These are the available protocol defines:

CURLPROTO_DICT
CURLPROTO_FILE
CURLPROTO_FTP
CURLPROTO_FTPS
CURLPROTO_GOPHER
CURLPROTO_HTTP
CURLPROTO_HTTPS
CURLPROTO_IMAP
CURLPROTO_IMAPS
CURLPROTO_LDAP
CURLPROTO_LDAPS
CURLPROTO_POP3
CURLPROTO_POP3S
CURLPROTO_RTMP
CURLPROTO_RTMPE
CURLPROTO_RTMPS
CURLPROTO_RTMPT
CURLPROTO_RTMPTE
CURLPROTO_RTMPTS
CURLPROTO_RTSP
CURLPROTO_SCP
CURLPROTO_SFTP
CURLPROTO_SMB
CURLPROTO_SMBS
CURLPROTO_SMTP
CURLPROTO_SMTPS
CURLPROTO_TELNET
CURLPROTO_TFTP

All protocols built-in.

This functionality affects all supported protocols

int main(int argc, char **argv)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    /* pass in the URL from an external source */
    curl_easy_setopt(curl, CURLOPT_URL, argv[1]);

    /* only allow HTTP, TFTP and SFTP */
    curl_easy_setopt(curl, CURLOPT_PROTOCOLS,
                     CURLPROTO_HTTP | CURLPROTO_TFTP | CURLPROTO_SFTP);

    /* Perform the request */
    curl_easy_perform(curl);
  }
}

Deprecated since 7.85.0.

Added in curl 7.19.4

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

CURLOPT_DEFAULT_PROTOCOL(3), CURLOPT_REDIR_PROTOCOLS(3), CURLOPT_URL(3)

curl_easy_setopt(3), CURLOPT_REDIR_PROTOCOLS(3), CURLOPT_REDIR_PROTOCOLS_STR(3).