Daniel Stenberg c4ab33370a

CURLOPT_*-docs: provide additional details

Went through CURLOPTTYPE_STRINGPOINT and CURLOPTTYPE_SLISTPOINT options
and clarified:

- what happens when setting the option *again*

- setting to NULL disables/restores to default

- libcurl does not copy the slist for options using a such

Closes #14846

2024-09-10 13:48:42 +02:00

1.4 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

TLS-backend

Added-in

curl

CURLOPT_SSL_EC_CURVES

libcurl

CURLOPT_SSL_CIPHER_LIST (3)

CURLOPT_SSL_OPTIONS (3)

CURLOPT_TLS13_CIPHERS (3)

TLS

OpenSSL

wolfSSL

7.73.0

NAME

CURLOPT_SSL_EC_CURVES - key exchange curves

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *list);

DESCRIPTION

Pass a string as parameter with a colon delimited list of Elliptic curve (EC) algorithms. This option defines the client's key exchange algorithms in the SSL handshake (if the SSL backend libcurl is built to use supports it).

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 restore back to internal default.

DEFAULT

"", embedded in SSL backend

%PROTOCOLS%

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

%AVAILABILITY%

RETURN VALUE

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

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