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CURLOPT_SSH_KNOWNHOSTS(3) Library Functions Manual CURLOPT_SSH_KNOWNHOSTS(3) NAME CURLOPT_SSH_KNOWNHOSTS - filename holding the SSH known hosts SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_KNOWNHOSTS, char *fname); DESCRIPTION Pass a pointer to a null-terminated string holding the filename of the known_host file to use. The known_hosts file should use the OpenSSH file format. If this file is specified, libcurl only accepts connec- tions with hosts that are known and present in that file, with a match- ing public key. Use CURLOPT_SSH_KEYFUNCTION(3) to alter the default be- havior on host and key matches and mismatches. We strongly suggest users doing SCP or SFTP transfers to set this op- tion to make sure that the network communication is done with the in- tended server and not an impostor. The application does not have to keep the string around after setting this option. Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again. DEFAULT NULL PROTOCOLS This functionality affects scp and sftp EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/file"); curl_easy_setopt(curl, CURLOPT_SSH_KNOWNHOSTS, "/home/clarkkent/.ssh/known_hosts"); res = curl_easy_perform(curl); curl_easy_cleanup(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). SEE ALSO CURLOPT_SSH_AUTH_TYPES(3), CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3), CUR- LOPT_SSH_HOST_PUBLIC_KEY_SHA256(3) libcurl 2025-06-03 CURLOPT_SSH_KNOWNHOSTS(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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