OCSP_sendreq_new.3ssl - Man Page

OCSP responder query functions


 #include <openssl/ocsp.h>

 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, const char *path, OCSP_REQUEST *req,
                                int maxline);

 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx);

 void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx);

 void OCSP_set_max_response_length(OCSP_REQ_CTX *rctx, unsigned long len);

 int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
                              const char *name, const char *value);

 int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req);

 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *io, const char *path, OCSP_REQUEST *req);


The function OCSP_sendreq_new() returns an OCSP_CTX structure using the responder io, the URL path path, the OCSP request req and with a response header maximum line length of maxline. If maxline is zero a default value of 4k is used. The OCSP request req may be set to NULL and provided later if required.

OCSP_sendreq_nbio() performs non-blocking I/O on the OCSP request context rctx. When the operation is complete it returns the response in *presp.

OCSP_REQ_CTX_free() frees up the OCSP context rctx.

OCSP_set_max_response_length() sets the maximum response length for rctx to len. If the response exceeds this length an error occurs. If not set a default value of 100k is used.

OCSP_REQ_CTX_add1_header() adds header name with value value to the context rctx. It can be called more than once to add multiple headers. It MUST be called before any calls to OCSP_sendreq_nbio(). The req parameter in the initial to OCSP_sendreq_new() call MUST be set to NULL if additional headers are set.

OCSP_REQ_CTX_set1_req() sets the OCSP request in rctx to req. This function should be called after any calls to OCSP_REQ_CTX_add1_header().

OCSP_sendreq_bio() performs an OCSP request using the responder io, the URL path path, and the OCSP request req with a response header maximum line length 4k. It waits indefinitely on a response.

Return Values

OCSP_sendreq_new() returns a valid OCSP_REQ_CTX structure or NULL if an error occurred.

OCSP_sendreq_nbio() returns 1 if the operation was completed successfully, -1 if the operation should be retried and 0 if an error occurred.

OCSP_REQ_CTX_add1_header() and OCSP_REQ_CTX_set1_req() return 1 for success and 0 for failure.

OCSP_sendreq_bio() returns the OCSP_RESPONSE structure sent by the responder or NULL if an error occurred.

OCSP_REQ_CTX_free() and OCSP_set_max_response_length() do not return values.


These functions only perform a minimal HTTP query to a responder. If an application wishes to support more advanced features it should use an alternative more complete HTTP library.

Currently only HTTP POST queries to responders are supported.

The arguments to OCSP_sendreq_new() correspond to the components of the URL. For example if the responder URL is http://ocsp.com/ocspreq the BIO io should be connected to host ocsp.com on port 80 and path should be set to “/ocspreq”

The headers added with OCSP_REQ_CTX_add1_header() are of the form "name: value“ or just ”name" if value is NULL. So to add a Host header for ocsp.com you would call:

 OCSP_REQ_CTX_add1_header(ctx, "Host", "ocsp.com");

If OCSP_sendreq_nbio() indicates an operation should be retried the corresponding BIO can be examined to determine which operation (read or write) should be retried and appropriate action taken (for example a select() call on the underlying socket).

OCSP_sendreq_bio() does not support retries and so cannot handle non-blocking I/O efficiently. It is retained for compatibility and its use in new applications is not recommended.

See Also

crypto(7), OCSP_cert_to_id(3), OCSP_request_add1_nonce(3), OCSP_REQUEST_new(3), OCSP_resp_find_status(3), OCSP_response_status(3)

Referenced By

OCSP_cert_to_id.3ssl(3), OCSP_request_add1_nonce.3ssl(3), OCSP_REQUEST_new.3ssl(3), OCSP_resp_find_status.3ssl(3), OCSP_response_status.3ssl(3).

The man pages OCSP_REQ_CTX_add1_header.3ssl(3), OCSP_REQ_CTX_free.3ssl(3), OCSP_REQ_CTX_set1_req.3ssl(3), OCSP_sendreq_bio.3ssl(3), OCSP_sendreq_nbio.3ssl(3) and OCSP_set_max_response_length.3ssl(3) are aliases of OCSP_sendreq_new.3ssl(3).

2020-07-28 1.1.1g OpenSSL