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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) { CURLcode result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(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 2026-06-11 CURLOPT_SSH_HOSTKEYDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | NOTES | AVAILABILITY | RETURN VALUE | SEE ALSO
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