CURLOPT_SSH_KEYDATA(3) Library Functions Manual CURLOPT_SSH_KEYDATA(3)

CURLOPT_SSH_HOSTKEYDATA - pointer to pass to the SSH host key callback

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOSTKEYDATA, void *pointer);

Pass a void * as parameter. This pointer is passed along untouched to the callback set with CURLOPT_SSH_HOSTKEYFUNCTION(3).

NULL

SCP and SFTP

struct mine {

void *custom; }; static int hostkeycb(void *clientp, /* CURLOPT_SSH_HOSTKEYDATA */
int keytype, /* CURLKHTYPE */
const char *key, /* host key to check */
size_t keylen) /* length of the key */ {
/* 'clientp' points to the callback_data struct */
/* investigate the situation and return the correct value */
return CURLKHMATCH_OK; } int main(void) {
CURL *curl = curl_easy_init();
if(curl) {
struct mine callback_data;
curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/thisfile.txt");
curl_easy_setopt(curl, CURLOPT_SSH_HOSTKEYFUNCTION, hostkeycb);
curl_easy_setopt(curl, CURLOPT_SSH_HOSTKEYDATA, &callback_data);
curl_easy_perform(curl);
} }

Added in 7.84.0, works only with libssh2 backend.

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

CURLOPT_SSH_HOSTKEYFUNCTION(3)

September 26, 2023 ibcurl 8.4.0