113 lines
4.1 KiB
Text
113 lines
4.1 KiB
Text
=pod
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=head1 NAME
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OCSP_sendreq_new, OCSP_sendreq_nbio, OCSP_REQ_CTX_free,
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OCSP_set_max_response_length, OCSP_REQ_CTX_add1_header,
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OCSP_REQ_CTX_set1_req, OCSP_sendreq_bio - OCSP responder query functions
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=head1 SYNOPSIS
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#include <openssl/ocsp.h>
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OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, const char *path, OCSP_REQUEST *req,
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int maxline);
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int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx);
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void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx);
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void OCSP_set_max_response_length(OCSP_REQ_CTX *rctx, unsigned long len);
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int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
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const char *name, const char *value);
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int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req);
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OCSP_RESPONSE *OCSP_sendreq_bio(BIO *io, const char *path, OCSP_REQUEST *req,
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int maxline);
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=head1 DESCRIPTION
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The function OCSP_sendreq_new() returns an B<OCSP_CTX> structure using the
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responder B<io>, the URL path B<path>, the OCSP request B<req> and with a
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response header maximum line length of B<maxline>. If B<maxline> is zero a
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default value of 4k is used. The OCSP request B<req> may be set to B<NULL>
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and provided later if required.
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OCSP_sendreq_nbio() performs non-blocking I/O on the OCSP request context
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B<rctx>. When the operation is complete it returns the response in B<*presp>.
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OCSP_REQ_CTX_free() frees up the OCSP context B<rctx>.
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OCSP_set_max_response_length() sets the maximum response length for B<rctx>
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to B<len>. If the response exceeds this length an error occurs. If not
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set a default value of 100k is used.
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OCSP_REQ_CTX_add1_header() adds header B<name> with value B<value> to the
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context B<rctx>. It can be called more than once to add multiple headers.
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It B<MUST> be called before any calls to OCSP_sendreq_nbio(). The B<req>
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parameter in the initial to OCSP_sendreq_new() call MUST be set to B<NULL> if
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additional headers are set.
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OCSP_REQ_CTX_set1_req() sets the OCSP request in B<rctx> to B<req>. This
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function should be called after any calls to OCSP_REQ_CTX_add1_header().
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OCSP_sendreq_bio() performs an OCSP request using the responder B<io>, the URL
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path B<path>, the OCSP request B<req> and with a response header maximum line
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length of B<maxline>. If B<maxline> is zero a default value of 4k is used.
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=head1 RETURN VALUES
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OCSP_sendreq_new() returns a valid B<OCSP_REQ_CTX> structure or B<NULL> if
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an error occurred.
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OCSP_sendreq_nbio() returns B<1> if the operation was completed successfully,
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B<-1> if the operation should be retried and B<0> if an error occurred.
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OCSP_REQ_CTX_add1_header() and OCSP_REQ_CTX_set1_req() return B<1> for success
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and B<0> for failure.
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OCSP_sendreq_bio() returns the B<OCSP_RESPONSE> structure sent by the
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responder or B<NULL> if an error occurred.
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OCSP_REQ_CTX_free() and OCSP_set_max_response_length() do not return values.
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=head1 NOTES
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These functions only perform a minimal HTTP query to a responder. If an
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application wishes to support more advanced features it should use an
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alternative more complete HTTP library.
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Currently only HTTP POST queries to responders are supported.
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The arguments to OCSP_sendreq_new() correspond to the components of the URL.
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For example if the responder URL is B<http://ocsp.com/ocspreq> the BIO
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B<io> should be connected to host B<ocsp.com> on port 80 and B<path>
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should be set to B<"/ocspreq">
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The headers added with OCSP_REQ_CTX_add1_header() are of the form
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"B<name>: B<value>" or just "B<name>" if B<value> is B<NULL>. So to add
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a Host header for B<ocsp.com> you would call:
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OCSP_REQ_CTX_add1_header(ctx, "Host", "ocsp.com");
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If OCSP_sendreq_nbio() indicates an operation should be retried the
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corresponding BIO can be examined to determine which operation (read or
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write) should be retried and appropriate action taken (for example a select()
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call on the underlying socket).
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OCSP_sendreq_bio() does not support retries and so cannot handle non-blocking
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I/O efficiently. It is retained for compatibility and its use in new
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applications is not recommended.
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=head1 SEE ALSO
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L<crypto(3)>,
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L<OCSP_cert_to_id(3)>,
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L<OCSP_request_add1_nonce(3)>,
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L<OCSP_REQUEST_new(3)>,
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L<OCSP_response_find_status(3)>,
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L<OCSP_response_status(3)>
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=cut
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