Tribblix: manual page: CURLOPT_SSH

CURLOPT_SSH_HOSTKEYDATA(3) Introduction to Library Functions

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).