CURLOPT_USERNAME - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERNAME,
                          char *username);

Pass a char pointer as parameter, which should be pointing to the null-terminated username to use for the transfer.

CURLOPT_USERNAME(3) sets the username to be used in protocol authentication. You should not use this option together with the (older) CURLOPT_USERPWD(3) option.

When using Kerberos V5 authentication with a Windows based server, you should include the domain name in order for the server to successfully obtain a Kerberos Ticket. If you do not then the initial part of the authentication handshake may fail.

When using NTLM, the username can be specified simply as the username without the domain name should the server be part of a single domain and forest.

To include the domain name use either Down-Level Logon Name or UPN (User Principal Name) formats. For example, Exampleser and user@example.com respectively.

Some HTTP servers (on Windows) support inclusion of the domain for Basic authentication as well.

To specify the password and login options, along with the username, use the CURLOPT_PASSWORD(3) and CURLOPT_LOGIN_OPTIONS(3) options.

The application does not have to keep the string around after setting this option.

blank

This functionality affects all supported protocols

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

    curl_easy_setopt(curl, CURLOPT_USERNAME, "clark");

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
  }
}

Added in curl 7.19.1

Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

CURLOPT_HTTPAUTH(3), CURLOPT_PASSWORD(3), CURLOPT_PROXYAUTH(3), CURLOPT_USERPWD(3)

curl_easy_setopt(3), CURLOPT_FTP_ACCOUNT(3), CURLOPT_FTP_ALTERNATIVE_TO_USER(3), CURLOPT_HTTPAUTH(3), CURLOPT_LOGIN_OPTIONS(3), CURLOPT_NETRC(3), CURLOPT_NETRC_FILE(3), CURLOPT_PASSWORD(3), CURLOPT_PROXYUSERNAME(3), CURLOPT_SASL_AUTHZID(3), CURLOPT_USERPWD(3), CURLOPT_XOAUTH2_BEARER(3), libcurl-symbols(3).