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.\" generated by cd2nroff 0.1 from CURLOPT_CAPATH.md
.TH CURLOPT_CAPATH 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_CAPATH \- directory holding CA certificates
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAPATH, char *capath);
.fi
.SH DESCRIPTION
Pass a char pointer to a null\-terminated string naming a directory holding
multiple CA certificates to verify the peer with. If libcurl is built against
OpenSSL, the certificate directory must be prepared using the OpenSSL c_rehash
utility. This makes sense only when used in combination with the
\fICURLOPT_SSL_VERIFYPEER(3)\fP option.
The \fICURLOPT_CAPATH(3)\fP function apparently does not work in Windows due
to some limitation in OpenSSL.
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.
The default value for this can be figured out with \fICURLINFO_CAPATH(3)\fP.
.SH DEFAULT
A path detected at build time.
.SH PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
This option works only with the following TLS backends:
GnuTLS, OpenSSL, mbedTLS and wolfSSL
.SH EXAMPLE
.nf
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_CAPATH, "/etc/cert-dir");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
.fi
.SH AVAILABILITY
Added in curl 7.9.8
.SH RETURN VALUE
CURLE_OK if supported; or an error such as:
CURLE_NOT_BUILT_IN \- Not supported by the SSL backend
CURLE_UNKNOWN_OPTION
CURLE_OUT_OF_MEMORY
.SH SEE ALSO
.BR CURLINFO_CAPATH (3),
.BR CURLOPT_CAINFO (3),
.BR CURLOPT_DEBUGFUNCTION (3),
.BR CURLOPT_STDERR (3)