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57 .IX Title "OSSL-GUIDE-QUIC-CLIENT-BLOCK 7ossl"
58 .TH OSSL-GUIDE-QUIC-CLIENT-BLOCK 7ossl 2025-09-30 3.5.4 OpenSSL
64 ossl\-guide\-quic\-client\-block
65 \&\- OpenSSL Guide: Writing a simple blocking QUIC client
71 QUIC is non-standard and will not be supported by real world servers. This is
76 (see \fBossl\-guide\-libraries\-introduction\fR\|(7), \fBossl\-guide\-tls\-introduction\fR\|(7)
77 and \fBossl\-guide\-quic\-introduction\fR\|(7)); and that you know how to
82 \&\fBossl\-guide\-tls\-client\-block\fR\|(7). Only the differences between that client and
87 tutorial will discuss how to write a multi-stream client (see
88 \&\fBossl\-guide\-quic\-multi\-stream\fR\|(7)).
92 \&\f(CW\*(C`quic\-client\-block.c\*(C'\fR. It is also available online at
93 <https://github.com/openssl/openssl/blob/master/demos/guide/quic\-client\-block.c>.
96 In the TLS tutorial (\fBossl\-guide\-tls\-client\-block\fR\|(7)) we created an \fBSSL_CTX\fR
110 mode", see \fBossl\-guide\-quic\-introduction\fR\|(7)). For this tutorial we will be
122 \& printf("Failed to create the SSL_CTX\en");
159 \& * Create a TCP socket. We could equally use non\-OpenSSL calls such
166 \& if (sock == \-1)
172 \& sock = \-1;
179 \& sock = \-1;
186 \& if (sock != \-1) {
204 have blocking behaviour. See \fBossl\-guide\-quic\-introduction\fR\|(7) for further
250 ALPN (Application-Layer Protocol Negotiation) is a feature of TLS that enables
254 <https://www.iana.org/assignments/tls\-extensiontype\-values/tls\-extensiontype\-values.xml#alpn\-p…
257 simple client that we developed in \fBossl\-guide\-tls\-client\-block\fR\|(7) did not use
266 \& printf("Failed to set the ALPN for the connection\en");
285 \& printf("Failed to set the initial peer address\en");
303 automatically associated with the \fBSSL\fR object for us. We can transmit data
319 \& printf("Failed to write start of HTTP request\en");
323 \& printf("Failed to write hostname in HTTP request\en");
328 \& printf("Failed to write end of HTTP request\en");
344 \& * number of bytes that we read. The data could be non\-printable or
351 \& printf("\en");
369 \& * reset \- or some failure occurred on the underlying connection.
373 \& printf("Stream reset occurred\en");
378 \& printf("Connection closed\en");
383 \& printf("Unknown stream failure\en");
390 \& printf ("Failed reading remaining data\en");
409 gives us information about the stream itself and does not tell us anything about
428 \& printf("Error shutting down: %d\en", ret);
447 See \fBossl\-guide\-quic\-multi\-stream\fR\|(7) to read a tutorial on how to modify the
451 \&\fBossl\-guide\-introduction\fR\|(7), \fBossl\-guide\-libraries\-introduction\fR\|(7),
452 \&\fBossl\-guide\-libssl\-introduction\fR\|(7), \fBossl\-guide\-tls\-introduction\fR\|(7),
453 \&\fBossl\-guide\-tls\-client\-block\fR\|(7), \fBossl\-guide\-quic\-introduction\fR\|(7)
456 Copyright 2023\-2025 The OpenSSL Project Authors. All Rights Reserved.