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.TH CURLOPT_SSL_CTX_DATA 3 "November 04, 2020" "libcurl 7.77.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_SSL_CTX_DATA \- custom pointer passed to ssl_ctx callback
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CTX_DATA, void *pointer);
.SH DESCRIPTION
Data \fIpointer\fP to pass to the ssl context callback set by the option
\fICURLOPT_SSL_CTX_FUNCTION(3)\fP, this is the pointer you'll get as third
parameter.
.SH DEFAULT
NULL
.SH PROTOCOLS
All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
.SH EXAMPLE
.nf
/* OpenSSL specific */

#include <openssl/ssl.h>
#include <curl/curl.h>
#include <stdio.h>

static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
{
  X509_STORE *store;
  X509 *cert=NULL;
  BIO *bio;
  char *mypem = (char *)parm;
  /* get a BIO */
  bio=BIO_new_mem_buf(mypem, -1);
  /* use it to read the PEM formatted certificate from memory into an
   * X509 structure that SSL can use
   */
  PEM_read_bio_X509(bio, &cert, 0, NULL);
  if(cert == NULL)
    printf("PEM_read_bio_X509 failed...\\n");

  /* get a pointer to the X509 certificate store (which may be empty) */
  store=SSL_CTX_get_cert_store((SSL_CTX *)sslctx);

  /* add our certificate to this store */
  if(X509_STORE_add_cert(store, cert)==0)
    printf("error adding certificate\\n");

  /* decrease reference counts */
  X509_free(cert);
  BIO_free(bio);

  /* all set to go */
  return CURLE_OK;
}

int main(void)
{
  CURL * ch;
  CURLcode rv;
  char *mypem = /* example CA cert PEM - shortened */
    "-----BEGIN CERTIFICATE-----\\n"
    "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\\n"
    "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\\n"
    "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\\n"
    "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\\n"
    "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\\n"
    "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\\n"
    "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\\n"
    "-----END CERTIFICATE-----\\n";

  rv=curl_global_init(CURL_GLOBAL_ALL);
  ch=curl_easy_init();
  rv=curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
  rv=curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 1L);
  rv=curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");

  /* Retrieve page using cacerts' certificate -> will succeed
   * load the certificate by installing a function doing the necessary
   * "modifications" to the SSL CONTEXT just before link init
   */
  rv=curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
  rv=curl_easy_setopt(ch, CURLOPT_SSL_CTX_DATA, mypem);
  rv=curl_easy_perform(ch);
  if(rv==CURLE_OK)
    printf("*** transfer succeeded ***\\n");
  else
    printf("*** transfer failed ***\\n");

  curl_easy_cleanup(ch);
  curl_global_cleanup();
  return rv;
}
.fi
.SH AVAILABILITY
Added in 7.11.0 for OpenSSL, in 7.42.0 for wolfSSL and in 7.54.0 for
mbedTLS. Other SSL backends are not supported.
.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
.SH "SEE ALSO"
.BR CURLOPT_SSL_CTX_FUNCTION "(3), " CURLOPT_SSLVERSION "(3), "

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