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CURLOPT_SSH_HOSTKEYDATA(3) Library Functions Manual CURLOPT_SSH_HOSTKEYDATA(3)

NAME
       CURLOPT_SSH_HOSTKEYDATA - pointer to pass to the	SSH host key callback

SYNOPSIS
       #include	<curl/curl.h>

       CURLcode	curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOSTKEYDATA,	void *pointer);

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

DEFAULT
       NULL

PROTOCOLS
       This functionality affects scp and sftp

EXAMPLE
       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);
	 }
       }

NOTES
       Works only with the libssh2 backend.

AVAILABILITY
       Added in	curl 7.84.0

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_SSH_HOSTKEYFUNCTION(3)

libcurl				  2025-06-03	    CURLOPT_SSH_HOSTKEYDATA(3)

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