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CURLOPT_SSH_KEYDATA(3)

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CURLOPT_SSH_KEYDATA(3)     Library Functions Manual     CURLOPT_SSH_KEYDATA(3)

NAME
       CURLOPT_SSH_KEYDATA - pointer passed to the SSH key callback

SYNOPSIS
       #include <curl/curl.h>

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

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

DEFAULT
       NULL

PROTOCOLS
       This functionality affects scp and sftp

EXAMPLE
       struct mine {
         void *custom;
       };
       static int keycb(CURL *easy,
                        const struct curl_khkey *knownkey,
                        const struct curl_khkey *foundkey,
                        enum curl_khmatch match,
                        void *clientp)
       {
         /* 'clientp' points to the callback_data struct */
         /* investigate the situation and return the correct value */
         return CURLKHSTAT_FINE_ADD_TO_FILE;
       }

       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_KEYFUNCTION, keycb);
           curl_easy_setopt(curl, CURLOPT_SSH_KEYDATA, &callback_data);
           curl_easy_setopt(curl, CURLOPT_SSH_KNOWNHOSTS, "/home/user/known_hosts");

           curl_easy_perform(curl);
         }
       }

AVAILABILITY
       Added in curl 7.19.6

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).


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   web/curl = Stability Uncommitted

SEE ALSO
       CURLOPT_SSH_KEYDATA(3), CURLOPT_SSH_KNOWNHOSTS(3)



NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://curl.se/download/curl-8.17.0.tar.bz2

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.

libcurl                           2025-12-01            CURLOPT_SSH_KEYDATA(3)
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